Redo networking (#22)

* Rewriting network functions

* Add buffer to dup
Fix non-blocking handling by triggering once on enabling events to read to EOF

* Modifications for UDP API

* Implement TCP client side

* Add active close

* Add DMAR parser

* Implement basic TCP listening. Need to improve the state machine

* Reduce debugging

* Fixes for close procedure

* Updates to fix path processing in libstd

Makefile

@@ -42,7 +42,6 @@ clean:
 	cargo clean --manifest-path programs/userutils/Cargo.toml
 	cargo clean --manifest-path programs/smith/Cargo.toml
 	cargo clean --manifest-path programs/tar/Cargo.toml
-	cargo clean --manifest-path schemes/arpd/Cargo.toml
 	cargo clean --manifest-path schemes/ethernetd/Cargo.toml
 	cargo clean --manifest-path schemes/example/Cargo.toml
 	cargo clean --manifest-path schemes/ipd/Cargo.toml
@@ -92,7 +91,6 @@ update:
 	cargo update --manifest-path programs/userutils/Cargo.toml
 	cargo update --manifest-path programs/smith/Cargo.toml
 	cargo update --manifest-path programs/tar/Cargo.toml
-	cargo update --manifest-path schemes/arpd/Cargo.toml
 	cargo update --manifest-path schemes/ethernetd/Cargo.toml
 	cargo update --manifest-path schemes/example/Cargo.toml
 	cargo update --manifest-path schemes/ipd/Cargo.toml
@@ -120,7 +118,12 @@ $(KBUILD)/harddrive.bin: $(KBUILD)/kernel
 qemu: $(KBUILD)/harddrive.bin
 	$(QEMU) $(QEMUFLAGS) -kernel $<
 else
-	QEMUFLAGS+=-machine q35 -smp 4 -m 1024
+	QEMUFLAGS+=-smp 4 -m 1024
+	ifeq ($(iommu),no)
+		QEMUFLAGS+=-machine q35
+	else
+		QEMUFLAGS+=-machine q35,iommu=on
+	endif
 	ifeq ($(net),no)
 		QEMUFLAGS+=-net none
 	else
@@ -406,7 +409,6 @@ userutils: \
 	filesystem/bin/sudo
 
 schemes: \
-	filesystem/bin/arpd \
 	filesystem/bin/ethernetd \
 	filesystem/bin/example \
 	filesystem/bin/ipd \

arch/x86_64/src/acpi/dmar.rs

@@ -0,0 +1,170 @@
+use core::mem;
+
+use super::sdt::Sdt;
+
+/// The DMA Remapping Table
+#[derive(Debug)]
+pub struct Dmar {
+    sdt: &'static Sdt,
+    pub addr_width: u8,
+    pub flags: u8,
+    _rsv: [u8; 10],
+}
+
+impl Dmar {
+    pub fn new(sdt: &'static Sdt) -> Option<Dmar> {
+        if &sdt.signature == b"DMAR" && sdt.data_len() >= 12 { //Not valid if no local address and flags
+            let addr_width = unsafe { *(sdt.data_address() as *const u8) };
+            let flags = unsafe { *(sdt.data_address() as *const u8).offset(1) };
+            let rsv: [u8; 10] = unsafe { *((sdt.data_address() as *const u8).offset(2) as *const [u8; 10]) };
+
+            Some(Dmar {
+                sdt: sdt,
+                addr_width: addr_width,
+                flags: flags,
+                _rsv: rsv,
+            })
+        } else {
+            None
+        }
+    }
+
+    pub fn iter(&self) -> DmarIter {
+        DmarIter {
+            sdt: self.sdt,
+            i: 12 // Skip address width and flags
+        }
+    }
+}
+
+///
+
+/// DMAR DMA Remapping Hardware Unit Definition
+// TODO: Implement iterator on DmarDrhd scope
+#[derive(Debug)]
+#[repr(packed)]
+pub struct DmarDrhd {
+    kind: u16,
+    length: u16,
+    flags: u8,
+    _rsv: u8,
+    segment: u16,
+    base: u64,
+}
+
+/// DMAR Reserved Memory Region Reporting
+// TODO: Implement iterator on DmarRmrr scope
+#[derive(Debug)]
+#[repr(packed)]
+pub struct DmarRmrr {
+    kind: u16,
+    length: u16,
+    _rsv: u16,
+    segment: u16,
+    base: u64,
+    limit: u64,
+}
+
+/// DMAR Root Port ATS Capability Reporting
+// TODO: Implement iterator on DmarAtsr scope
+#[derive(Debug)]
+#[repr(packed)]
+pub struct DmarAtsr {
+    kind: u16,
+    length: u16,
+    flags: u8,
+    _rsv: u8,
+    segment: u16,
+}
+
+/// DMAR Remapping Hardware Static Affinity
+#[derive(Debug)]
+#[repr(packed)]
+pub struct DmarRhsa {
+    kind: u16,
+    length: u16,
+    _rsv: u32,
+    base: u64,
+    domain: u32,
+}
+
+/// DMAR ACPI Name-space Device Declaration
+// TODO: Implement iterator on DmarAndd object name
+#[derive(Debug)]
+#[repr(packed)]
+pub struct DmarAndd {
+    kind: u16,
+    length: u16,
+    _rsv: [u8; 3],
+    acpi_dev: u8,
+}
+
+/// DMAR Entries
+#[derive(Debug)]
+pub enum DmarEntry {
+    Drhd(&'static DmarDrhd),
+    InvalidDrhd(usize),
+    Rmrr(&'static DmarRmrr),
+    InvalidRmrr(usize),
+    Atsr(&'static DmarAtsr),
+    InvalidAtsr(usize),
+    Rhsa(&'static DmarRhsa),
+    InvalidRhsa(usize),
+    Andd(&'static DmarAndd),
+    InvalidAndd(usize),
+    Unknown(u16)
+}
+
+pub struct DmarIter {
+    sdt: &'static Sdt,
+    i: usize
+}
+
+impl Iterator for DmarIter {
+    type Item = DmarEntry;
+    fn next(&mut self) -> Option<Self::Item> {
+        if self.i + 4 <= self.sdt.data_len() {
+            let entry_type = unsafe { *((self.sdt.data_address() as *const u8).offset(self.i as isize) as *const u16) };
+            let entry_len = unsafe { *((self.sdt.data_address() as *const u8).offset(self.i as isize + 2) as *const u16) } as usize;
+
+            if self.i + entry_len <= self.sdt.data_len() {
+                let item = match entry_type {
+                    0 => if entry_len >= mem::size_of::<DmarDrhd>() {
+                        DmarEntry::Drhd(unsafe { &*((self.sdt.data_address() + self.i) as *const DmarDrhd) })
+                    } else {
+                        DmarEntry::InvalidDrhd(entry_len)
+                    },
+                    1 => if entry_len >= mem::size_of::<DmarRmrr>() {
+                        DmarEntry::Rmrr(unsafe { &*((self.sdt.data_address() + self.i) as *const DmarRmrr) })
+                    } else {
+                        DmarEntry::InvalidRmrr(entry_len)
+                    },
+                    2 => if entry_len >= mem::size_of::<DmarAtsr>() {
+                        DmarEntry::Atsr(unsafe { &*((self.sdt.data_address() + self.i) as *const DmarAtsr) })
+                    } else {
+                        DmarEntry::InvalidAtsr(entry_len)
+                    },
+                    3 => if entry_len == mem::size_of::<DmarRhsa>() {
+                        DmarEntry::Rhsa(unsafe { &*((self.sdt.data_address() + self.i) as *const DmarRhsa) })
+                    } else {
+                        DmarEntry::InvalidRhsa(entry_len)
+                    },
+                    4 => if entry_len >= mem::size_of::<DmarAndd>() {
+                        DmarEntry::Andd(unsafe { &*((self.sdt.data_address() + self.i) as *const DmarAndd) })
+                    } else {
+                        DmarEntry::InvalidAndd(entry_len)
+                    },
+                    _ => DmarEntry::Unknown(entry_type)
+                };
+
+                self.i += entry_len;
+
+                Some(item)
+            } else {
+                None
+            }
+        } else {
+            None
+        }
+    }
+}

arch/x86_64/src/acpi/mod.rs

@@ -9,12 +9,14 @@ use memory::{allocate_frames, Frame};
 use paging::{entry, ActivePageTable, Page, PhysicalAddress, VirtualAddress};
 use start::{kstart_ap, CPU_COUNT, AP_READY};
 
+use self::dmar::Dmar;
 use self::local_apic::LocalApic;
 use self::madt::{Madt, MadtEntry};
 use self::rsdt::Rsdt;
 use self::sdt::Sdt;
 use self::xsdt::Xsdt;
 
+pub mod dmar;
 pub mod local_apic;
 pub mod madt;
 pub mod rsdt;
@@ -133,6 +135,12 @@ pub fn init_sdt(sdt: &'static Sdt, active_table: &mut ActivePageTable) {
         // Unmap trampoline
         active_table.unmap(trampoline_page);
         active_table.flush(trampoline_page);
+    } else if let Some(dmar) = Dmar::new(sdt) {
+        println!(": {}: {}", dmar.addr_width, dmar.flags);
+
+        for dmar_entry in dmar.iter() {
+            println!("      {:?}", dmar_entry);
+        }
     } else {
         println!(": Unknown");
     }

crates/event/src/lib.rs

@@ -38,13 +38,43 @@ impl<R> EventQueue<R> {
         Ok(())
     }
 
+    /// Remove a file from the event queue, returning its callback if found
+    pub fn remove(&mut self, fd: RawFd) -> Result<Option<Box<FnMut(usize) -> Result<Option<R>>>>> {
+        if let Some(callback) = self.callbacks.remove(&fd) {
+            syscall::fevent(fd, 0).map_err(|x| Error::from_sys(x))?;
+
+            Ok(Some(callback))
+        } else {
+            Ok(None)
+        }
+    }
+
+    /// Send an event to a descriptor callback
+    pub fn trigger(&mut self, fd: RawFd, count: usize) -> Result<Option<R>> {
+        if let Some(callback) = self.callbacks.get_mut(&fd) {
+            callback(count)
+        } else {
+            Ok(None)
+        }
+    }
+
+    /// Send an event to all descriptor callbacks, useful for cleaning out buffers after init
+    pub fn trigger_all(&mut self, count: usize) -> Result<Vec<R>> {
+        let mut rets = Vec::new();
+        for (_fd, callback) in self.callbacks.iter_mut() {
+            if let Some(ret) = callback(count)? {
+                rets.push(ret);
+            }
+        }
+        Ok(rets)
+    }
+
     /// Process the event queue until a callback returns Some(R)
     pub fn run(&mut self) -> Result<R> {
         loop {
             let mut event = syscall::Event::default();
-            self.file.read(&mut event)?;
+            if self.file.read(&mut event)? > 0 {
-            if let Some(callback) = self.callbacks.get_mut(&event.id) {
+                if let Some(ret) = self.trigger(event.id, event.data)? {
-                if let Some(ret) = callback(event.data)? {
                     return Ok(ret);
                 }
             }

crates/resource_scheme/src/resource.rs

@@ -4,7 +4,7 @@ use syscall::error::*;
 pub trait Resource {
     /// Duplicate the resource
     /// Returns `EPERM` if the operation is not supported.
-    fn dup(&self) -> Result<Box<Self>> {
+    fn dup(&self, _buf: &[u8]) -> Result<Box<Self>> {
         Err(Error::new(EPERM))
     }
 

crates/resource_scheme/src/scheme.rs

@@ -16,7 +16,7 @@ pub trait ResourceScheme<T: Resource> {
             SYS_RMDIR => self.rmdir(unsafe { slice::from_raw_parts(packet.b as *const u8, packet.c) }, packet.uid, packet.gid),
             SYS_UNLINK => self.unlink(unsafe { slice::from_raw_parts(packet.b as *const u8, packet.c) }, packet.uid, packet.gid),
 
-            SYS_DUP => self.dup(packet.b),
+            SYS_DUP => self.dup(packet.b, unsafe { slice::from_raw_parts(packet.c as *const u8, packet.d) }),
             SYS_READ => self.read(packet.b, unsafe { slice::from_raw_parts_mut(packet.c as *mut u8, packet.d) }),
             SYS_WRITE => self.write(packet.b, unsafe { slice::from_raw_parts(packet.c as *const u8, packet.d) }),
             SYS_LSEEK => self.seek(packet.b, packet.c, packet.d),
@@ -54,9 +54,9 @@ pub trait ResourceScheme<T: Resource> {
     }
 
     /* Resource operations */
-    fn dup(&self, old_id: usize) -> Result<usize> {
+    fn dup(&self, old_id: usize, buf: &[u8]) -> Result<usize> {
         let old = unsafe { &*(old_id as *const T) };
-        let resource = old.dup()?;
+        let resource = old.dup(buf)?;
         let resource_ptr = Box::into_raw(resource);
         Ok(resource_ptr as usize)
     }

drivers/ahcid/src/main.rs

@@ -52,10 +52,14 @@ fn main() {
                 let mut event = Event::default();
                 event_file.read(&mut event).expect("ahcid: failed to read event file");
                 if event.id == socket_fd {
+                    loop {
                         let mut packet = Packet::default();
-                    socket.read(&mut packet).expect("ahcid: failed to read disk scheme");
+                        if socket.read(&mut packet).expect("ahcid: failed to read disk scheme") == 0 {
+                            break;
+                        }                        
                         scheme.handle(&mut packet);
                         socket.write(&mut packet).expect("ahcid: failed to write disk scheme");
+                    }
                 } else if event.id == irq_fd {
                     let mut irq = [0; 8];
                     if irq_file.read(&mut irq).expect("ahcid: failed to read irq file") >= irq.len() {

drivers/ahcid/src/scheme.rs

@@ -47,7 +47,7 @@ impl Scheme for DiskScheme {
         }
     }
 
-    fn dup(&self, id: usize) -> Result<usize> {
+    fn dup(&self, id: usize, _buf: &[u8]) -> Result<usize> {
         let mut handles = self.handles.lock();
         let new_handle = {
             let handle = handles.get(&id).ok_or(Error::new(EBADF))?;

drivers/e1000d/src/device.rs

@@ -109,7 +109,7 @@ impl Scheme for Intel8254x {
         }
     }
 
-    fn dup(&self, id: usize) -> Result<usize> {
+    fn dup(&self, id: usize, _buf: &[u8]) -> Result<usize> {
         Ok(id)
     }
 

drivers/e1000d/src/main.rs

@@ -80,8 +80,11 @@ fn main() {
 
             let socket_packet = socket.clone();
             event_queue.add(socket_fd, move |_count: usize| -> Result<Option<usize>> {
+                loop {
                     let mut packet = Packet::default();
-                socket_packet.borrow_mut().read(&mut packet)?;
+                    if socket_packet.borrow_mut().read(&mut packet)? == 0 {
+                        break;
+                    }
 
                     let a = packet.a;
                     device.handle(&mut packet);
@@ -91,6 +94,7 @@ fn main() {
                     } else {
                         socket_packet.borrow_mut().write(&mut packet)?;
                     }
+                }
 
                 let next_read = device.next_read();
                 if next_read > 0 {
@@ -100,10 +104,8 @@ fn main() {
                 Ok(None)
             }).expect("e1000d: failed to catch events on IRQ file");
 
-            loop {
+            for event_count in event_queue.trigger_all(0).expect("e1000d: failed to trigger events") {
-                let event_count = event_queue.run().expect("e1000d: failed to handle events");
+                socket.borrow_mut().write(&Packet {
-
-                let event_packet = Packet {
                     id: 0,
                     pid: 0,
                     uid: 0,
@@ -112,9 +114,22 @@ fn main() {
                     b: 0,
                     c: syscall::flag::EVENT_READ,
                     d: event_count
-                };
+                }).expect("e1000d: failed to write event");
+            }
 
-                socket.borrow_mut().write(&event_packet).expect("vesad: failed to write display event");
+            loop {
+                let event_count = event_queue.run().expect("e1000d: failed to handle events");
+
+                socket.borrow_mut().write(&Packet {
+                    id: 0,
+                    pid: 0,
+                    uid: 0,
+                    gid: 0,
+                    a: syscall::number::SYS_FEVENT,
+                    b: 0,
+                    c: syscall::flag::EVENT_READ,
+                    d: event_count
+                }).expect("e1000d: failed to write event");
             }
         }
         unsafe { let _ = syscall::physunmap(address); }

drivers/ps2d/src/main.rs

@@ -32,6 +32,92 @@ bitflags! {
     }
 }
 
+struct Ps2d {
+    input: File,
+    lshift: bool,
+    rshift: bool,
+    packets: [u8; 4],
+    packet_i: usize,
+    extra_packet: bool
+}
+
+impl Ps2d {
+    fn new(input: File, extra_packet: bool) -> Self {
+        Ps2d {
+            input: input,
+            lshift: false,
+            rshift: false,
+            packets: [0; 4],
+            packet_i: 0,
+            extra_packet: extra_packet
+        }
+    }
+
+    fn handle(&mut self, keyboard: bool, data: u8) {
+        if keyboard {
+            let (scancode, pressed) = if data >= 0x80 {
+                (data - 0x80, false)
+            } else {
+                (data, true)
+            };
+
+            if scancode == 0x2A {
+                self.lshift = pressed;
+            } else if scancode == 0x36 {
+                self.rshift = pressed;
+            }
+
+            self.input.write(&KeyEvent {
+                character: keymap::get_char(scancode, self.lshift || self.rshift),
+                scancode: scancode,
+                pressed: pressed
+            }.to_event()).expect("ps2d: failed to write key event");
+        } else {
+            self.packets[self.packet_i] = data;
+            self.packet_i += 1;
+
+            let flags = MousePacketFlags::from_bits_truncate(self.packets[0]);
+            if ! flags.contains(ALWAYS_ON) {
+                println!("MOUSE MISALIGN {:X}", self.packets[0]);
+
+                self.packets = [0; 4];
+                self.packet_i = 0;
+            } else if self.packet_i >= self.packets.len() || (!self.extra_packet && self.packet_i >= 3) {
+                if ! flags.contains(X_OVERFLOW) && ! flags.contains(Y_OVERFLOW) {
+                    let mut dx = self.packets[1] as i32;
+                    if flags.contains(X_SIGN) {
+                        dx -= 0x100;
+                    }
+
+                    let mut dy = -(self.packets[2] as i32);
+                    if flags.contains(Y_SIGN) {
+                        dy += 0x100;
+                    }
+
+                    let _extra = if self.extra_packet {
+                        self.packets[3]
+                    } else {
+                        0
+                    };
+
+                    self.input.write(&MouseEvent {
+                        x: dx,
+                        y: dy,
+                        left_button: flags.contains(LEFT_BUTTON),
+                        middle_button: flags.contains(MIDDLE_BUTTON),
+                        right_button: flags.contains(RIGHT_BUTTON)
+                    }.to_event()).expect("ps2d: failed to write mouse event");
+                } else {
+                    println!("ps2d: overflow {:X} {:X} {:X} {:X}", self.packets[0], self.packets[1], self.packets[2], self.packets[3]);
+                }
+
+                self.packets = [0; 4];
+                self.packet_i = 0;
+            }
+        }
+    }
+}
+
 fn main() {
     thread::spawn(|| {
         unsafe {
@@ -39,9 +125,11 @@ fn main() {
             asm!("cli" :::: "intel", "volatile");
         }
 
+        let input = File::open("display:input").expect("ps2d: failed to open display:input");
+
         let extra_packet = controller::Ps2::new().init();
 
-        let mut input = File::open("display:input").expect("ps2d: failed to open display:input");
+        let mut ps2d = Ps2d::new(input, extra_packet);
 
         let mut event_queue = EventQueue::<(bool, u8)>::new().expect("ps2d: failed to create event queue");
 
@@ -81,75 +169,13 @@ fn main() {
             }
         }).expect("ps2d: failed to poll irq:12");
 
-        let mut lshift = false;
+        for (keyboard, data) in event_queue.trigger_all(0).expect("ps2d: failed to trigger events") {
-        let mut rshift = false;
+            ps2d.handle(keyboard, data);
-        let mut packets = [0; 4];
+        }
-        let mut packet_i = 0;
 
         loop {
             let (keyboard, data) = event_queue.run().expect("ps2d: failed to handle events");
-
+            ps2d.handle(keyboard, data);
-            if keyboard {
-                let (scancode, pressed) = if data >= 0x80 {
-                    (data - 0x80, false)
-                } else {
-                    (data, true)
-                };
-
-                if scancode == 0x2A {
-                    lshift = pressed;
-                } else if scancode == 0x36 {
-                    rshift = pressed;
-                }
-
-                input.write(&KeyEvent {
-                    character: keymap::get_char(scancode, lshift || rshift),
-                    scancode: scancode,
-                    pressed: pressed
-                }.to_event()).expect("ps2d: failed to write key event");
-            } else {
-                packets[packet_i] = data;
-                packet_i += 1;
-
-                let flags = MousePacketFlags::from_bits_truncate(packets[0]);
-                if ! flags.contains(ALWAYS_ON) {
-                    println!("MOUSE MISALIGN {:X}", packets[0]);
-
-                    packets = [0; 4];
-                    packet_i = 0;
-                } else if packet_i >= packets.len() || (!extra_packet && packet_i >= 3) {
-                    if ! flags.contains(X_OVERFLOW) && ! flags.contains(Y_OVERFLOW) {
-                        let mut dx = packets[1] as i32;
-                        if flags.contains(X_SIGN) {
-                            dx -= 0x100;
-                        }
-
-                        let mut dy = -(packets[2] as i32);
-                        if flags.contains(Y_SIGN) {
-                            dy += 0x100;
-                        }
-
-                        let _extra = if extra_packet {
-                            packets[3]
-                        } else {
-                            0
-                        };
-
-                        input.write(&MouseEvent {
-                            x: dx,
-                            y: dy,
-                            left_button: flags.contains(LEFT_BUTTON),
-                            middle_button: flags.contains(MIDDLE_BUTTON),
-                            right_button: flags.contains(RIGHT_BUTTON)
-                        }.to_event()).expect("ps2d: failed to write mouse event");
-                    } else {
-                        println!("ps2d: overflow {:X} {:X} {:X} {:X}", packets[0], packets[1], packets[2], packets[3]);
-                    }
-
-                    packets = [0; 4];
-                    packet_i = 0;
-                }
-            }
         }
     });
 }

drivers/rtl8168d/src/device.rs

@@ -84,7 +84,7 @@ impl SchemeMut for Rtl8168 {
         }
     }
 
-    fn dup(&mut self, id: usize) -> Result<usize> {
+    fn dup(&mut self, id: usize, _buf: &[u8]) -> Result<usize> {
         Ok(id)
     }
 

drivers/rtl8168d/src/main.rs

@@ -85,8 +85,11 @@ fn main() {
             let socket_fd = socket.borrow().as_raw_fd();
             let socket_packet = socket.clone();
             event_queue.add(socket_fd, move |_count: usize| -> Result<Option<usize>> {
+                loop {
                     let mut packet = Packet::default();
-                socket_packet.borrow_mut().read(&mut packet)?;
+                    if socket_packet.borrow_mut().read(&mut packet)? == 0 {
+                        break;
+                    }
 
                     let a = packet.a;
                     device.borrow_mut().handle(&mut packet);
@@ -96,6 +99,7 @@ fn main() {
                     } else {
                         socket_packet.borrow_mut().write(&mut packet)?;
                     }
+                }
 
                 let next_read = device.borrow().next_read();
                 if next_read > 0 {
@@ -105,10 +109,8 @@ fn main() {
                 Ok(None)
             }).expect("rtl8168d: failed to catch events on IRQ file");
 
-            loop {
+            for event_count in event_queue.trigger_all(0).expect("rtl8168d: failed to trigger events") {
-                let event_count = event_queue.run().expect("rtl8168d: failed to handle events");
+                socket.borrow_mut().write(&Packet {
-
-                let event_packet = Packet {
                     id: 0,
                     pid: 0,
                     uid: 0,
@@ -117,9 +119,22 @@ fn main() {
                     b: 0,
                     c: syscall::flag::EVENT_READ,
                     d: event_count
-                };
+                }).expect("rtl8168d: failed to write event");
+            }
 
-                socket.borrow_mut().write(&event_packet).expect("vesad: failed to write display event");
+            loop {
+                let event_count = event_queue.run().expect("rtl8168d: failed to handle events");
+
+                socket.borrow_mut().write(&Packet {
+                    id: 0,
+                    pid: 0,
+                    uid: 0,
+                    gid: 0,
+                    a: syscall::number::SYS_FEVENT,
+                    b: 0,
+                    c: syscall::flag::EVENT_READ,
+                    d: event_count
+                }).expect("rtl8168d: failed to write event");
             }
         }
         unsafe { let _ = syscall::physunmap(address); }

drivers/vesad/src/main.rs

@@ -63,7 +63,6 @@ fn main() {
             loop {
                 let mut packet = Packet::default();
                 socket.read(&mut packet).expect("vesad: failed to read display scheme");
-                //println!("vesad: {:?}", packet);
 
                 // If it is a read packet, and there is no data, block it. Otherwise, handle packet
                 if packet.a == syscall::number::SYS_READ && packet.d > 0 && scheme.will_block(packet.b) {

drivers/vesad/src/scheme.rs

@@ -60,7 +60,7 @@ impl SchemeMut for DisplayScheme {
         }
     }
 
-    fn dup(&mut self, id: usize) -> Result<usize> {
+    fn dup(&mut self, id: usize, _buf: &[u8]) -> Result<usize> {
         Ok(id)
     }
 

filesystem/etc/init.rc

@@ -1,7 +1,6 @@
 randd
 initfs:bin/pcid /etc/pcid.toml
 ethernetd
-arpd
 ipd
 tcpd
 udpd

kernel/scheme/debug.rs

@@ -33,7 +33,7 @@ impl Scheme for DebugScheme {
         Ok(0)
     }
 
-    fn dup(&self, _file: usize) -> Result<usize> {
+    fn dup(&self, _file: usize, _buf: &[u8]) -> Result<usize> {
         Ok(0)
     }
 

kernel/scheme/env.rs

@@ -88,7 +88,7 @@ impl Scheme for EnvScheme {
         }
     }
 
-    fn dup(&self, id: usize) -> Result<usize> {
+    fn dup(&self, id: usize, _buf: &[u8]) -> Result<usize> {
         let new_handle = {
             let handles = self.handles.read();
             let handle = handles.get(&id).ok_or(Error::new(EBADF))?;

kernel/scheme/event.rs

@@ -39,7 +39,7 @@ impl Scheme for EventScheme {
         Ok(id)
     }
 
-    fn dup(&self, id: usize) -> Result<usize> {
+    fn dup(&self, id: usize, _buf: &[u8]) -> Result<usize> {
         let handle = {
             let handles = self.handles.read();
             let handle_weak = handles.get(&id).ok_or(Error::new(EBADF))?;

kernel/scheme/initfs.rs

@@ -57,7 +57,7 @@ impl Scheme for InitFsScheme {
         Err(Error::new(ENOENT))
     }
 
-    fn dup(&self, id: usize) -> Result<usize> {
+    fn dup(&self, id: usize, _buf: &[u8]) -> Result<usize> {
         let (path, data, mode, seek) = {
             let handles = self.handles.read();
             let handle = handles.get(&id).ok_or(Error::new(EBADF))?;

kernel/scheme/irq.rs

@@ -40,7 +40,7 @@ impl Scheme for IrqScheme {
         }
     }
 
-    fn dup(&self, file: usize) -> Result<usize> {
+    fn dup(&self, file: usize, _buf: &[u8]) -> Result<usize> {
         Ok(file)
     }
 

kernel/scheme/pipe.rs

@@ -42,7 +42,7 @@ pub fn pipe(flags: usize) -> (usize, usize) {
 pub struct PipeScheme;
 
 impl Scheme for PipeScheme {
-    fn dup(&self, id: usize) -> Result<usize> {
+    fn dup(&self, id: usize, _buf: &[u8]) -> Result<usize> {
         let mut pipes = pipes_mut();
 
         let read_option = pipes.0.get(&id).map(|pipe| pipe.clone());

kernel/scheme/root.rs

@@ -56,7 +56,7 @@ impl Scheme for RootScheme {
         }
     }
 
-    fn dup(&self, file: usize) -> Result<usize> {
+    fn dup(&self, file: usize, _buf: &[u8]) -> Result<usize> {
         let mut handles = self.handles.write();
         let inner = {
             let inner = handles.get(&file).ok_or(Error::new(EBADF))?;
@@ -89,12 +89,24 @@ impl Scheme for RootScheme {
         inner.write(buf)
     }
 
-    fn fevent(&self, file: usize, _flags: usize) -> Result<usize> {
+    fn fevent(&self, file: usize, flags: usize) -> Result<usize> {
-        Ok(file)
+        let inner = {
+            let handles = self.handles.read();
+            let inner = handles.get(&file).ok_or(Error::new(EBADF))?;
+            inner.clone()
+        };
+
+        inner.fevent(flags)
     }
 
-    fn fsync(&self, _file: usize) -> Result<usize> {
+    fn fsync(&self, file: usize) -> Result<usize> {
-        Ok(0)
+        let inner = {
+            let handles = self.handles.read();
+            let inner = handles.get(&file).ok_or(Error::new(EBADF))?;
+            inner.clone()
+        };
+
+        inner.fsync()
     }
 
     fn close(&self, file: usize) -> Result<usize> {

kernel/scheme/sys/mod.rs

@@ -92,7 +92,7 @@ impl Scheme for SysScheme {
         Err(Error::new(ENOENT))
     }
 
-    fn dup(&self, id: usize) -> Result<usize> {
+    fn dup(&self, id: usize, _buf: &[u8]) -> Result<usize> {
         let (path, data, mode, seek) = {
             let handles = self.handles.read();
             let handle = handles.get(&id).ok_or(Error::new(EBADF))?;

kernel/scheme/user.rs

@@ -61,10 +61,7 @@ impl UserInner {
         };
 
         let len = self.todo.send(packet);
-        //TODO: Use O_NONBLOCK and send one notification
+        context::event::trigger(ROOT_SCHEME_ID.load(Ordering::SeqCst), self.handle_id, EVENT_READ, mem::size_of::<Packet>() * len);
-        for _i in 0 .. len {
-            context::event::trigger(ROOT_SCHEME_ID.load(Ordering::SeqCst), self.handle_id, EVENT_READ, mem::size_of::<Packet>());
-        }
 
         Error::demux(self.done.receive(&id))
     }
@@ -182,6 +179,14 @@ impl UserInner {
 
         Ok(i * packet_size)
     }
+
+    pub fn fevent(&self, _flags: usize) -> Result<usize> {
+        Ok(self.handle_id)
+    }
+
+    pub fn fsync(&self) -> Result<usize> {
+        Ok(0)
+    }
 }
 
 /// UserInner has to be wrapped
@@ -230,9 +235,12 @@ impl Scheme for UserScheme {
         result
     }
 
-    fn dup(&self, file: usize) -> Result<usize> {
+    fn dup(&self, file: usize, buf: &[u8]) -> Result<usize> {
         let inner = self.inner.upgrade().ok_or(Error::new(ENODEV))?;
-        inner.call(SYS_DUP, file, 0, 0)
+        let address = inner.capture(buf)?;
+        let result = inner.call(SYS_DUP, file, address, buf.len());
+        let _ = inner.release(address);
+        result
     }
 
     fn read(&self, file: usize, buf: &mut [u8]) -> Result<usize> {

kernel/syscall/fs.rs

@@ -83,10 +83,10 @@ pub fn open(path: &[u8], flags: usize) -> Result<usize> {
     let reference_opt = parts.next();
 
     let (scheme_id, file_id) = {
-        let namespace = namespace_opt.ok_or(Error::new(ENOENT))?;
+        let namespace = namespace_opt.ok_or(Error::new(ENODEV))?;
         let (scheme_id, scheme) = {
             let schemes = scheme::schemes();
-            let (scheme_id, scheme) = schemes.get_name(namespace).ok_or(Error::new(ENOENT))?;
+            let (scheme_id, scheme) = schemes.get_name(namespace).ok_or(Error::new(ENODEV))?;
             (scheme_id, scheme.clone())
         };
         let file_id = scheme.open(reference_opt.unwrap_or(b""), flags, uid, gid)?;
@@ -146,10 +146,10 @@ pub fn mkdir(path: &[u8], mode: u16) -> Result<usize> {
     let namespace_opt = parts.next();
     let reference_opt = parts.next();
 
-    let namespace = namespace_opt.ok_or(Error::new(ENOENT))?;
+    let namespace = namespace_opt.ok_or(Error::new(ENODEV))?;
     let scheme = {
         let schemes = scheme::schemes();
-        let (_scheme_id, scheme) = schemes.get_name(namespace).ok_or(Error::new(ENOENT))?;
+        let (_scheme_id, scheme) = schemes.get_name(namespace).ok_or(Error::new(ENODEV))?;
         scheme.clone()
     };
     scheme.mkdir(reference_opt.unwrap_or(b""), mode, uid, gid)
@@ -168,10 +168,10 @@ pub fn rmdir(path: &[u8]) -> Result<usize> {
     let namespace_opt = parts.next();
     let reference_opt = parts.next();
 
-    let namespace = namespace_opt.ok_or(Error::new(ENOENT))?;
+    let namespace = namespace_opt.ok_or(Error::new(ENODEV))?;
     let scheme = {
         let schemes = scheme::schemes();
-        let (_scheme_id, scheme) = schemes.get_name(namespace).ok_or(Error::new(ENOENT))?;
+        let (_scheme_id, scheme) = schemes.get_name(namespace).ok_or(Error::new(ENODEV))?;
         scheme.clone()
     };
     scheme.rmdir(reference_opt.unwrap_or(b""), uid, gid)
@@ -190,10 +190,10 @@ pub fn unlink(path: &[u8]) -> Result<usize> {
     let namespace_opt = parts.next();
     let reference_opt = parts.next();
 
-    let namespace = namespace_opt.ok_or(Error::new(ENOENT))?;
+    let namespace = namespace_opt.ok_or(Error::new(ENODEV))?;
     let scheme = {
         let schemes = scheme::schemes();
-        let (_scheme_id, scheme) = schemes.get_name(namespace).ok_or(Error::new(ENOENT))?;
+        let (_scheme_id, scheme) = schemes.get_name(namespace).ok_or(Error::new(ENODEV))?;
         scheme.clone()
     };
     scheme.unlink(reference_opt.unwrap_or(b""), uid, gid)
@@ -222,7 +222,7 @@ pub fn close(fd: usize) -> Result<usize> {
 }
 
 /// Duplicate file descriptor
-pub fn dup(fd: usize) -> Result<usize> {
+pub fn dup(fd: usize, buf: &[u8]) -> Result<usize> {
     let file = {
         let contexts = context::contexts();
         let context_lock = contexts.current().ok_or(Error::new(ESRCH))?;
@@ -237,7 +237,7 @@ pub fn dup(fd: usize) -> Result<usize> {
             let scheme = schemes.get(file.scheme).ok_or(Error::new(EBADF))?;
             scheme.clone()
         };
-        scheme.dup(file.number)?
+        scheme.dup(file.number, buf)?
     };
 
     let contexts = context::contexts();

kernel/syscall/mod.rs

@@ -39,7 +39,7 @@ pub extern fn syscall(a: usize, b: usize, c: usize, d: usize, e: usize, f: usize
                 SYS_ARG_MSLICE => file_op_mut_slice(a, b, validate_slice_mut(c as *mut u8, d)?),
                 _ => match a {
                     SYS_CLOSE => close(b),
-                    SYS_DUP => dup(b),
+                    SYS_DUP => dup(b, validate_slice(c as *const u8, d)?),
                     SYS_FEVENT => fevent(b, c),
                     _ => file_op(a, b, c, d)
                 }

kernel/syscall/process.rs

@@ -227,7 +227,7 @@ pub fn clone(flags: usize, stack_base: usize) -> Result<usize> {
                             let scheme = schemes.get(file.scheme).ok_or(Error::new(EBADF))?;
                             scheme.clone()
                         };
-                        let result = scheme.dup(file.number);
+                        let result = scheme.dup(file.number, &[]);
                         result
                     };
                     match result {

libstd

@@ -1 +1 @@
-Subproject commit 4f642eed87af22913af7bef9c71910ee1765445e
+Subproject commit a390903a03d7cebe448af803e635a46fa1609262

programs/acid

@@ -1 +1 @@
-Subproject commit 9faaf3a9690186a12da980fb877c8f05faea62aa
+Subproject commit 1afcf7ab26ca3f697082674e6a72c94dd211c74b

programs/netutils

@@ -1 +1 @@
-Subproject commit 4eae543a60a5d6b0298db09bc48b2e6fab60b021
+Subproject commit 6926b235c47488f1bb2f5574a0445c7698e3ab99

programs/orbutils

@@ -1 +1 @@
-Subproject commit 517ca6d125e90d6b30e45a759f54b1d1b3b346d4
+Subproject commit 78cd23bf67adad79fb3e45ae4647055b01df026f

schemes/arpd/Cargo.toml

@@ -1,7 +0,0 @@
-[package]
-name = "arpd"
-version = "0.1.0"
-
-[dependencies]
-netutils = { path = "../../programs/netutils/" }
-syscall = { path = "../../syscall/" }

schemes/arpd/src/main.rs

@@ -1,40 +0,0 @@
-extern crate netutils;
-extern crate syscall;
-
-use netutils::{getcfg, Ipv4Addr, MacAddr, Arp};
-
-use std::thread;
-
-fn main() {
-    thread::spawn(move || {
-        while let Ok(link) = syscall::open("ethernet:/806", syscall::O_RDWR) {
-            loop {
-                let mut bytes = [0; 65536];
-                if let Ok(count) = syscall::read(link, &mut bytes) {
-                    if let Some(packet) = Arp::from_bytes(&bytes[..count]) {
-                        let mac_addr = MacAddr::from_str(&getcfg("mac").expect("arpd: failed to get mac address"));
-                        let ip_addr = Ipv4Addr::from_str(&getcfg("ip").expect("arpd: failed to get ip address"));
-
-                        if packet.header.oper.get() == 1 && packet.header.dst_ip.equals(ip_addr) {
-                            let mut response = Arp {
-                                header: packet.header,
-                                data: packet.data.clone(),
-                            };
-                            response.header.oper.set(2);
-                            response.header.dst_mac = packet.header.src_mac;
-                            response.header.dst_ip = packet.header.src_ip;
-                            response.header.src_mac = mac_addr;
-                            response.header.src_ip = ip_addr;
-
-                            let _ = syscall::write(link, &response.to_bytes());
-                        }
-                    }
-                } else {
-                    break;
-                }
-            }
-            let _ = syscall::close(link);
-        }
-        panic!("ARP: Failed to open ethernet");
-    });
-}

schemes/ethernetd/src/main.rs

@@ -68,8 +68,11 @@ fn main() {
         }).expect("ethernetd: failed to listen for network events");
 
         event_queue.add(socket_fd, move |_count: usize| -> Result<Option<()>> {
+            loop {
                 let mut packet = Packet::default();
-            socket.borrow_mut().read(&mut packet)?;
+                if socket.borrow_mut().read(&mut packet)? == 0 {
+                    break;
+                }
 
                 let a = packet.a;
                 scheme.borrow_mut().handle(&mut packet);
@@ -79,10 +82,13 @@ fn main() {
                 } else {
                     socket.borrow_mut().write(&mut packet)?;
                 }
+            }
 
             Ok(None)
         }).expect("ethernetd: failed to listen for scheme events");
 
+        event_queue.trigger_all(0).expect("ethernetd: failed to trigger events");
+
         event_queue.run().expect("ethernetd: failed to run event loop");
     });
 }

schemes/ethernetd/src/scheme.rs

@@ -1,20 +1,21 @@
 use std::collections::{BTreeMap, VecDeque};
 use std::fs::File;
-use std::io::{self, Read};
+use std::io::{self, Read, Write};
 use std::os::unix::io::AsRawFd;
 use std::{cmp, str, u16};
 
-use netutils::{getcfg, n16, MacAddr, EthernetII, EthernetIIHeader};
+use netutils::{getcfg, MacAddr, EthernetII};
 use syscall;
-use syscall::error::{Error, Result, EACCES, EBADF, ENOENT, EINVAL, EWOULDBLOCK};
+use syscall::error::{Error, Result, EACCES, EBADF, EINVAL, EWOULDBLOCK};
+use syscall::flag::O_NONBLOCK;
 use syscall::scheme::SchemeMut;
 
 #[derive(Clone)]
 pub struct Handle {
+    /// The flags this handle was opened with
+    flags: usize,
     /// The Host's MAC address
     pub host_addr: MacAddr,
-    /// The Peer's MAC address
-    pub peer_addr: Option<MacAddr>,
     /// The ethernet type
     pub ethertype: u16,
     /// The data
@@ -39,65 +40,51 @@ impl EthernetScheme {
     //TODO: Minimize allocation
     //TODO: Reduce iteration cost (use BTreeMap of ethertype to handle?)
     pub fn input(&mut self) -> io::Result<usize> {
+        let mut total = 0;
+        loop {
             let mut bytes = [0; 65536];
             let count = self.network.read(&mut bytes)?;
+            if count == 0 {
+                break;
+            }
             if let Some(frame) = EthernetII::from_bytes(&bytes[.. count]) {
                 for (_id, handle) in self.handles.iter_mut() {
                     if frame.header.ethertype.get() == handle.ethertype {
-                    if handle.peer_addr.is_none() {
-                        handle.peer_addr = Some(frame.header.src);
-                    }
                         handle.frames.push_back(frame.clone());
                     }
                 }
-            Ok(count)
+                total += count;
-        } else {
-            Ok(0)
             }
         }
+        Ok(total)
+    }
 }
 
 impl SchemeMut for EthernetScheme {
-    fn open(&mut self, url: &[u8], _flags: usize, uid: u32, _gid: u32) -> Result<usize> {
+    fn open(&mut self, url: &[u8], flags: usize, uid: u32, _gid: u32) -> Result<usize> {
         if uid == 0 {
             let mac_addr = MacAddr::from_str(&getcfg("mac").map_err(|err| err.into_sys())?);
             let path = try!(str::from_utf8(url).or(Err(Error::new(EINVAL))));
-            let mut parts = path.split("/");
-            if let Some(host_string) = parts.next() {
-                if let Some(ethertype_string) = parts.next() {
-                    let ethertype = u16::from_str_radix(ethertype_string, 16).unwrap_or(0);
 
-                    let peer_addr = if ! host_string.is_empty() {
+            let ethertype = u16::from_str_radix(path, 16).unwrap_or(0);
-                        Some(MacAddr::from_str(host_string))
-                    } else {
-                        None
-                    };
 
             let next_id = self.next_id;
             self.next_id += 1;
 
             self.handles.insert(next_id, Handle {
+                flags: flags,
                 host_addr: mac_addr,
-                        peer_addr: peer_addr,
                 ethertype: ethertype,
                 frames: VecDeque::new()
             });
 
-                    return Ok(next_id);
+            Ok(next_id)
-                } else {
-                    println!("Ethernet: No ethertype provided");
-                }
-            } else {
-                println!("Ethernet: No host provided");
-            }
-
-            Err(Error::new(ENOENT))
         } else {
             Err(Error::new(EACCES))
         }
     }
 
-    fn dup(&mut self, id: usize) -> Result<usize> {
+    fn dup(&mut self, id: usize, _buf: &[u8]) -> Result<usize> {
         let next_id = self.next_id;
         self.next_id += 1;
 
@@ -115,11 +102,14 @@ impl SchemeMut for EthernetScheme {
         let handle = self.handles.get_mut(&id).ok_or(Error::new(EBADF))?;
 
         if let Some(frame) = handle.frames.pop_front() {
-            for (b, d) in buf.iter_mut().zip(frame.data.iter()) {
+            let data = frame.to_bytes();
+            for (b, d) in buf.iter_mut().zip(data.iter()) {
                 *b = *d;
             }
 
-            Ok(cmp::min(buf.len(), frame.data.len()))
+            Ok(cmp::min(buf.len(), data.len()))
+        } else if handle.flags & O_NONBLOCK == O_NONBLOCK {
+            Ok(0)
         } else {
             Err(Error::new(EWOULDBLOCK))
         }
@@ -128,17 +118,12 @@ impl SchemeMut for EthernetScheme {
     fn write(&mut self, id: usize, buf: &[u8]) -> Result<usize> {
         let handle = self.handles.get(&id).ok_or(Error::new(EBADF))?;
 
-        match syscall::write(self.network.as_raw_fd(), &EthernetII {
+        if let Some(mut frame) = EthernetII::from_bytes(buf) {
-                                      header: EthernetIIHeader {
+            frame.header.src = handle.host_addr;
-                                          src: handle.host_addr,
+            frame.header.ethertype.set(handle.ethertype);
-                                          dst: handle.peer_addr.unwrap_or(MacAddr::BROADCAST),
+            self.network.write(&frame.to_bytes()).map_err(|err| err.into_sys())
-                                          ethertype: n16::new(handle.ethertype),
+        } else {
-                                      },
+            Err(Error::new(EINVAL))
-                                      data: Vec::from(buf),
-                                  }
-                                  .to_bytes()) {
-            Ok(_) => Ok(buf.len()),
-            Err(err) => Err(err),
         }
     }
 
@@ -151,14 +136,16 @@ impl SchemeMut for EthernetScheme {
     fn fpath(&mut self, id: usize, buf: &mut [u8]) -> Result<usize> {
         let handle = self.handles.get(&id).ok_or(Error::new(EBADF))?;
 
-        let path_string = format!("ethernet:{}/{:X}", handle.peer_addr.map_or(String::new(), |mac| mac.to_string()), handle.ethertype);
+        let path_string = format!("ethernet:{:X}", handle.ethertype);
         let path = path_string.as_bytes();
 
-        for (b, p) in buf.iter_mut().zip(path.iter()) {
+        let mut i = 0;
-            *b = *p;
+        while i < buf.len() && i < path.len() {
+            buf[i] = path[i];
+            i += 1;
         }
 
-        Ok(cmp::min(buf.len(), path.len()))
+        Ok(i)
     }
 
     fn fsync(&mut self, id: usize) -> Result<usize> {
@@ -169,7 +156,9 @@ impl SchemeMut for EthernetScheme {
 
     fn close(&mut self, id: usize) -> Result<usize> {
         let handle = self.handles.remove(&id).ok_or(Error::new(EBADF))?;
+
         drop(handle);
+
         Ok(0)
     }
 }

schemes/example/src/main.rs

@@ -15,7 +15,7 @@ impl Scheme for ExampleScheme {
         Ok(0)
     }
 
-    fn dup(&self, file: usize) -> Result<usize> {
+    fn dup(&self, file: usize, _buf: &[u8]) -> Result<usize> {
         Ok(file)
     }
 

schemes/ipd/Cargo.toml

@@ -3,6 +3,6 @@ name = "ipd"
 version = "0.1.0"
 
 [dependencies]
+event = { path = "../../crates/event/" }
 netutils = { path = "../../programs/netutils/" }
-resource_scheme = { path = "../../crates/resource_scheme/" }
 syscall = { path = "../../syscall/" }

schemes/ipd/src/main.rs

@@ -1,120 +1,371 @@
-#![feature(rand)]
+extern crate event;
-
-//! Implementation of the IP Scheme as a userland driver.
-//!
-//! # Role
-//!
-//! See https://en.wikipedia.org/wiki/Internet_Protocol for more details about the
-//! IP protocol. Clients will often prefer using either higher-level protocols TCP
-//! or UDP, both of which are built upon IP.
-//!
-//! # URL Syntax
-//!
-//! To open a IP connection, use `ip:[host]/protocol`.
-//!
-//! * If `host` is specified, it must be an ipv4 number (e.g. `192.168.0.1`)
-//! and the connection may be used immediately to send/receive data. Ip v4 number
-//! `127.0.0.1` is hardwired to the loopback device (i.e. localhost), which doesn't
-//! access any physical device and in which data can only be read by the same
-//! connection that has written it.
-//! * If `host` is omitted, this connectino will wait for a distant peer to
-//! connect.
-//! * The `protocol` is the hex-based number of the ip protocol
-//! (see http://www.iana.org/assignments/protocol-numbers/protocol-numbers.xhtml).
-
 extern crate netutils;
-extern crate resource_scheme;
 extern crate syscall;
 
+use event::EventQueue;
+use netutils::{getcfg, n16, Ipv4Addr, MacAddr, Ipv4, EthernetII, EthernetIIHeader, Arp, Tcp};
+use std::cell::RefCell;
+use std::collections::{BTreeMap, VecDeque};
 use std::fs::File;
-use std::io::{Read, Write};
+use std::io::{self, Read, Write};
-use std::thread;
+use std::os::unix::io::FromRawFd;
+use std::rc::Rc;
+use std::{slice, str, thread};
+use syscall::data::Packet;
+use syscall::error::{Error, Result, EACCES, EADDRNOTAVAIL, EBADF, EINVAL, ENOENT, EWOULDBLOCK};
+use syscall::flag::{EVENT_READ, O_NONBLOCK};
+use syscall::scheme::SchemeMut;
 
-use resource_scheme::ResourceScheme;
+struct Interface {
-use syscall::Packet;
+    mac: MacAddr,
+    ip: Ipv4Addr,
+    router: Ipv4Addr,
+    subnet: Ipv4Addr,
+    arp_file: File,
+    ip_file: File,
+    arp: BTreeMap<Ipv4Addr, MacAddr>,
+    rarp: BTreeMap<MacAddr, Ipv4Addr>,
+}
 
-use scheme::IpScheme;
+impl Interface {
+    fn new(arp_fd: usize, ip_fd: usize) -> Self {
+        Interface {
+            mac: MacAddr::from_str(&getcfg("mac").unwrap()),
+            ip: Ipv4Addr::from_str(&getcfg("ip").unwrap()),
+            router: Ipv4Addr::from_str(&getcfg("ip_router").unwrap()),
+            subnet: Ipv4Addr::from_str(&getcfg("ip_subnet").unwrap()),
+            arp_file: unsafe { File::from_raw_fd(arp_fd) },
+            ip_file: unsafe { File::from_raw_fd(ip_fd) },
+            arp: BTreeMap::new(),
+            rarp: BTreeMap::new(),
+        }
+    }
+}
 
-mod resource;
+struct Handle {
-mod scheme;
+    proto: u8,
+    flags: usize,
+    events: usize,
+    data: VecDeque<Vec<u8>>,
+    todo: VecDeque<Packet>,
+}
+
+struct Ipd {
+    scheme_file: File,
+    interfaces: Vec<Interface>,
+    next_id: usize,
+    handles: BTreeMap<usize, Handle>,
+}
+
+impl Ipd {
+    fn new(scheme_file: File) -> Self {
+        Ipd {
+            scheme_file: scheme_file,
+            interfaces: Vec::new(),
+            next_id: 1,
+            handles: BTreeMap::new(),
+        }
+    }
+
+    fn scheme_event(&mut self) -> io::Result<()> {
+        loop {
+            let mut packet = Packet::default();
+            if self.scheme_file.read(&mut packet)? == 0 {
+                break;
+            }
+
+            let a = packet.a;
+            self.handle(&mut packet);
+            if packet.a == (-EWOULDBLOCK) as usize {
+                packet.a = a;
+                if let Some(mut handle) = self.handles.get_mut(&packet.b) {
+                    handle.todo.push_back(packet);
+                }
+            } else {
+                self.scheme_file.write(&packet)?;
+            }
+        }
+
+        Ok(())
+    }
+
+    fn arp_event(&mut self, if_id: usize) -> io::Result<()> {
+        if let Some(mut interface) = self.interfaces.get_mut(if_id) {
+            loop {
+                let mut bytes = [0; 65536];
+                let count = interface.arp_file.read(&mut bytes)?;
+                if count == 0 {
+                    break;
+                }
+                if let Some(frame) = EthernetII::from_bytes(&bytes[.. count]) {
+                    if let Some(packet) = Arp::from_bytes(&frame.data) {
+                        if packet.header.oper.get() == 1 {
+                            if packet.header.dst_ip == interface.ip {
+                                let mut response = Arp {
+                                    header: packet.header,
+                                    data: packet.data.clone(),
+                                };
+                                response.header.oper.set(2);
+                                response.header.dst_mac = packet.header.src_mac;
+                                response.header.dst_ip = packet.header.src_ip;
+                                response.header.src_mac = interface.mac;
+                                response.header.src_ip = interface.ip;
+
+                                let mut response_frame = EthernetII {
+                                    header: frame.header,
+                                    data: response.to_bytes()
+                                };
+
+                                response_frame.header.dst = response_frame.header.src;
+                                response_frame.header.src = interface.mac;
+
+                                interface.arp_file.write(&response_frame.to_bytes())?;
+                            }
+                        }
+                    }
+                }
+            }
+        }
+
+        Ok(())
+    }
+
+    fn ip_event(&mut self, if_id: usize) -> io::Result<()> {
+        if let Some(mut interface) = self.interfaces.get_mut(if_id) {
+            loop {
+                let mut bytes = [0; 65536];
+                let count = interface.ip_file.read(&mut bytes)?;
+                if count == 0 {
+                    break;
+                }
+                if let Some(frame) = EthernetII::from_bytes(&bytes[.. count]) {
+                    if let Some(ip) = Ipv4::from_bytes(&frame.data) {
+                        if ip.header.dst == interface.ip || ip.header.dst == Ipv4Addr::BROADCAST {
+                            //TODO: Handle ping here
+                            for (id, handle) in self.handles.iter_mut() {
+                                if ip.header.proto == handle.proto {
+                                    handle.data.push_back(frame.data.clone());
+
+                                    while ! handle.todo.is_empty() && ! handle.data.is_empty() {
+                                        let mut packet = handle.todo.pop_front().unwrap();
+                                        let buf = unsafe { slice::from_raw_parts_mut(packet.c as *mut u8, packet.d) };
+                                        let data = handle.data.pop_front().unwrap();
+
+                                        let mut i = 0;
+                                        while i < buf.len() && i < data.len() {
+                                            buf[i] = data[i];
+                                            i += 1;
+                                        }
+                                        packet.a = i;
+
+                                        self.scheme_file.write(&packet)?;
+                                    }
+
+                                    if handle.events & EVENT_READ == EVENT_READ {
+                                        if let Some(data) = handle.data.get(0) {
+                                            self.scheme_file.write(&Packet {
+                                                id: 0,
+                                                pid: 0,
+                                                uid: 0,
+                                                gid: 0,
+                                                a: syscall::number::SYS_FEVENT,
+                                                b: *id,
+                                                c: EVENT_READ,
+                                                d: data.len()
+                                            })?;
+                                        }
+                                    }
+                                }
+                            }
+                        }
+                    }
+                }
+            }
+        }
+
+        Ok(())
+    }
+}
+
+impl SchemeMut for Ipd {
+    fn open(&mut self, url: &[u8], flags: usize, uid: u32, _gid: u32) -> Result<usize> {
+        if uid == 0 {
+            let path = str::from_utf8(url).or(Err(Error::new(EINVAL)))?;
+
+            let proto = u8::from_str_radix(path, 16).or(Err(Error::new(ENOENT)))?;
+
+            let id = self.next_id;
+            self.next_id += 1;
+
+            self.handles.insert(id, Handle {
+                proto: proto,
+                flags: flags,
+                events: 0,
+                data: VecDeque::new(),
+                todo: VecDeque::new(),
+            });
+
+            Ok(id)
+        } else {
+            Err(Error::new(EACCES))
+        }
+    }
+
+    fn dup(&mut self, file: usize, _buf: &[u8]) -> Result<usize> {
+        let handle = {
+            let handle = self.handles.get(&file).ok_or(Error::new(EBADF))?;
+            Handle {
+                proto: handle.proto,
+                flags: handle.flags,
+                events: 0,
+                data: handle.data.clone(),
+                todo: VecDeque::new(),
+            }
+        };
+
+        let id = self.next_id;
+        self.next_id += 1;
+
+        self.handles.insert(id, handle);
+
+        Ok(id)
+    }
+
+    fn read(&mut self, file: usize, buf: &mut [u8]) -> Result<usize> {
+        let mut handle = self.handles.get_mut(&file).ok_or(Error::new(EBADF))?;
+
+        if let Some(data) = handle.data.pop_front() {
+            let mut i = 0;
+            while i < buf.len() && i < data.len() {
+                buf[i] = data[i];
+                i += 1;
+            }
+
+            Ok(i)
+        } else if handle.flags & O_NONBLOCK == O_NONBLOCK {
+            Ok(0)
+        } else {
+            Err(Error::new(EWOULDBLOCK))
+        }
+    }
+
+    fn write(&mut self, file: usize, buf: &[u8]) -> Result<usize> {
+        let handle = self.handles.get(&file).ok_or(Error::new(EBADF))?;
+
+        if let Some(mut ip) = Ipv4::from_bytes(buf) {
+            for mut interface in self.interfaces.iter_mut() {
+                if ip.header.src == interface.ip || ip.header.src == Ipv4Addr::NULL {
+                    ip.header.src = interface.ip;
+                    ip.header.proto = handle.proto;
+
+                    if let Some(mut tcp) = Tcp::from_bytes(&ip.data) {
+                        tcp.checksum(&ip.header.src, &ip.header.dst);
+                        ip.data = tcp.to_bytes();
+                    }
+
+                    ip.checksum();
+
+                    let frame = EthernetII {
+                        header: EthernetIIHeader {
+                            //TODO: Get real dst
+                            dst: MacAddr::BROADCAST,
+                            src: interface.mac,
+                            ethertype: n16::new(0x800),
+                        },
+                        data: ip.to_bytes()
+                    };
+
+                    interface.ip_file.write(&frame.to_bytes()).map_err(|err| err.into_sys())?;
+
+                    return Ok(buf.len());
+                }
+            }
+
+            Err(Error::new(EADDRNOTAVAIL))
+        } else {
+            Err(Error::new(EINVAL))
+        }
+    }
+
+    fn fevent(&mut self, file: usize, flags: usize) -> Result<usize> {
+        let mut handle = self.handles.get_mut(&file).ok_or(Error::new(EBADF))?;
+
+        handle.events = flags;
+
+        Ok(file)
+    }
+
+    fn fpath(&mut self, id: usize, buf: &mut [u8]) -> Result<usize> {
+        let handle = self.handles.get(&id).ok_or(Error::new(EBADF))?;
+
+        let path_string = format!("ip:{:X}", handle.proto);
+        let path = path_string.as_bytes();
+
+        let mut i = 0;
+        while i < buf.len() && i < path.len() {
+            buf[i] = path[i];
+            i += 1;
+        }
+
+        Ok(i)
+    }
+
+    fn fsync(&mut self, file: usize) -> Result<usize> {
+        let _handle = self.handles.get(&file).ok_or(Error::new(EBADF))?;
+
+        Ok(0)
+    }
+
+    fn close(&mut self, file: usize) -> Result<usize> {
+        let handle = self.handles.remove(&file).ok_or(Error::new(EBADF))?;
+
+        drop(handle);
+
+        Ok(0)
+    }
+}
 
 fn main() {
     thread::spawn(move || {
-        let mut socket = File::create(":ip").expect("ipd: failed to create ip scheme");
+        let scheme_fd = syscall::open(":ip", syscall::O_RDWR | syscall::O_CREAT | syscall::O_NONBLOCK).expect("ipd: failed to create :ip");
-        let scheme = IpScheme::new();
+        let scheme_file = unsafe { File::from_raw_fd(scheme_fd) };
-        loop {
+
-            let mut packet = Packet::default();
+        let ipd = Rc::new(RefCell::new(Ipd::new(scheme_file)));
-            socket.read(&mut packet).expect("ipd: failed to read events from ip scheme");
+
-            scheme.handle(&mut packet);
+        let mut event_queue = EventQueue::<()>::new().expect("ipd: failed to create event queue");
-            socket.write(&packet).expect("ipd: failed to write responses to ip scheme");
+
+        //TODO: Multiple interfaces
+        {
+            let arp_fd = syscall::open("ethernet:806", syscall::O_RDWR | syscall::O_NONBLOCK).expect("ipd: failed to open ethernet:806");
+            let ip_fd = syscall::open("ethernet:800", syscall::O_RDWR | syscall::O_NONBLOCK).expect("ipd: failed to open ethernet:800");
+            let if_id = {
+                let mut ipd = ipd.borrow_mut();
+                let if_id = ipd.interfaces.len();
+                ipd.interfaces.push(Interface::new(arp_fd, ip_fd));
+                if_id
+            };
+
+            let arp_ipd = ipd.clone();
+            event_queue.add(arp_fd, move |_count: usize| -> io::Result<Option<()>> {
+                arp_ipd.borrow_mut().arp_event(if_id)?;
+                Ok(None)
+            }).expect("ipd: failed to listen to events on ethernet:806");
+
+            let ip_ipd = ipd.clone();
+            event_queue.add(ip_fd, move |_count: usize| -> io::Result<Option<()>> {
+                ip_ipd.borrow_mut().ip_event(if_id)?;
+                Ok(None)
+            }).expect("ipd: failed to listen to events on ethernet:800");
         }
+
+        event_queue.add(scheme_fd, move |_count: usize| -> io::Result<Option<()>> {
+            ipd.borrow_mut().scheme_event()?;
+            Ok(None)
+        }).expect("ipd: failed to listen to events on :ip");
+
+        // Make sure that all descriptors are at EOF
+        event_queue.trigger_all(0).expect("ipd: failed to trigger event queue");
+
+        event_queue.run().expect("ipd: failed to run event queue");
     });
 }
-
-#[cfg(test)]
-fn test() {
-    use scheme::IpScheme;
-
-    println!("* Test that we can read a simple packet from the same connection.");
-    let bytes = "TEST".as_bytes();
-    let mut scheme = IpScheme::new();
-    let a = scheme.open(&"ip:127.0.0.1/11".as_bytes(), 0, 0, 0).unwrap();
-    let num_bytes_written = scheme.write(a, bytes).unwrap();
-    assert_eq!(num_bytes_written, bytes.len());
-
-    let mut buf = [0;65536];
-    let num_bytes_read = scheme.read(a, &mut buf).unwrap();
-    assert_eq!(num_bytes_read, num_bytes_written);
-
-    let bytes_read = &buf[0..num_bytes_read];
-    assert_eq!(bytes, bytes_read);
-
-
-
-    println!("* Test that the loopback is now empty.");
-    let num_bytes_read = scheme.read(a, &mut buf).unwrap();
-    assert_eq!(num_bytes_read, 0);
-
-
-
-    println!("* Test that we can read the same packet from a different connection.");
-    let num_bytes_written = scheme.write(a, bytes).unwrap();
-    assert_eq!(num_bytes_written, bytes.len());
-
-    let b = scheme.open("ip:127.0.0.1/11".as_bytes(), 0, 0, 0).unwrap();
-
-    let num_bytes_read = scheme.read(b, &mut buf).unwrap();
-    assert_eq!(num_bytes_read, num_bytes_written);
-
-    let bytes_read = &buf[0..num_bytes_read];
-    assert_eq!(bytes, bytes_read);
-
-
-
-    println!("* Test that the loopback is now empty for both connections.");
-
-    let num_bytes_read = scheme.read(a, &mut buf).unwrap();
-    assert_eq!(num_bytes_read, 0);
-
-    let num_bytes_read = scheme.read(b, &mut buf).unwrap();
-    assert_eq!(num_bytes_read, 0);
-
-
-
-
-    println!("* Push a number of packets, check that we get them in the right order.");
-    let mut payloads : Vec<String> = (0..100).map(|i| format!("TEST {}", i)).collect();
-    for payload in &payloads {
-        let bytes = payload.into_bytes();
-        let num_bytes_written = scheme.write(a, &bytes).unwrap();
-        assert_eq!(bytes.len(), num_bytes_written);
-    }
-    for payload in &payloads {
-        let bytes = payload.into_bytes();
-        let mut buf = [0;65536];
-        let num_bytes_read = scheme.read(a, &mut buf).unwrap();
-        assert_eq!(bytes.len(), num_bytes_read);
-        let bytes_read = &buf[0..num_bytes_read];
-        assert_eq!(bytes, bytes_read);
-    }
-}

schemes/ipd/src/resource.rs

@@ -1,242 +0,0 @@
-use std::cell::RefCell;
-use std::{cmp, mem};
-use std::collections::VecDeque;
-use std::rc::Rc;
-use std::sync::Mutex;
-
-use netutils::{n16, Ipv4Addr, Checksum, Ipv4Header, Ipv4};
-use resource_scheme::Resource;
-use syscall;
-use syscall::error::*;
-
-/// Max number of bytes in a packet.
-const MAX_PACKET_LENGTH : usize = 65536;
-
-/// A IP (internet protocol) resource.
-///
-/// Each instance represents a connection (~ a IP socket).
-pub struct IpResource {
-    /// The underlying mechanism ensured to connect to the peer.
-    pub connection: Connection,
-
-    /// The IP address of the host (i.e. this machine).
-    pub host_addr: Ipv4Addr,
-
-    /// The IP address of the peer (i.e. the other machine).
-    pub peer_addr: Ipv4Addr,
-
-    /// The IP protocol used by this connection. See
-    /// http://www.iana.org/assignments/protocol-numbers/protocol-numbers.xhtml
-    /// for the list of valid protocols.
-    pub proto: u8,
-
-    /// The id of the next packet being sent.
-    /// See https://en.wikipedia.org/wiki/IPv4#Identification .
-    pub id: u16,
-}
-
-pub enum Connection {
-    Device {
-        /// Link to the underlying device (typically, an Ethernet card).
-        link: usize,
-
-        /// If this connection was opened waiting for a peer (i.e. `ip:/protocol`),
-        /// the data received when the peer actually connected. Otherwise, empty.
-        /// Emptied during the first call to `read()`.
-        init_data: Vec<u8>,
-    },
-    Loopback {
-        /// FIFO queue of packets written to the loopback and waiting to be read.
-        ///
-        /// The data stored contains the exact data that has been added by the client
-        /// calling `write()`, without adding any headers.
-        ///
-        /// This buffer is shared between all loopback connections.
-        packets: Rc<RefCell<VecDeque<Vec<u8>>>>
-    }
-}
-
-impl Resource for IpResource {
-    /// Duplicate the connection.
-    ///
-    /// This duplicates both `self.link` and `self.init_data`.
-    ///
-    /// # Errors
-    ///
-    /// Fails if the `link` to the underlying device cannot be
-    /// duplicated.
-    fn dup(&self) -> Result<Box<Self>> {
-        use self::Connection::*;
-        let connection = match self.connection {
-            Loopback { ref packets }=> Loopback { packets: packets.clone() },
-            Device { link, ref init_data } => {
-                let link = try!(syscall::dup(link));
-                let init_data = init_data.clone();
-                Device {
-                    link: link,
-                    init_data: init_data
-                }
-            }
-        };
-        Ok(Box::new(IpResource {
-            host_addr: self.host_addr,
-            peer_addr: self.peer_addr,
-            proto: self.proto,
-            id: self.id,
-            connection: connection,
-        }))
-    }
-
-    /// Get the current path, as `ip:peer/protocol`, where `peer`
-    /// is the IPv4 address of the peer and `protocol` is the hex-based
-    /// number of the IP protocol used.
-    ///
-    /// Note that the `peer` is specified even if the connection was initially
-    /// created as `ip:/protocol`.
-    fn path(&self, buf: &mut [u8]) -> Result<usize> {
-        let path_string = format!("ip:{}/{:X}", self.peer_addr.to_string(), self.proto);
-        let path = path_string.as_bytes();
-
-        for (b, p) in buf.iter_mut().zip(path.iter()) {
-            *b = *p;
-        }
-
-        Ok(cmp::min(buf.len(), path.len()))
-    }
-
-    /// Read data from the device.
-    ///
-    /// If some data has already been made available during the establishment
-    /// of the connection, this data is (entirely) read during the first call
-    /// to `read()`, without attempting to actually read from the device. This
-    /// can happen only if the connection was waiting for a remote peer to connect, i.e.
-    /// with a url `ip:/protocol`, without host.
-    ///
-    /// If this connection is a loopback, oldest unread packet written is read.
-    ///
-    /// # Errors
-    ///
-    /// Fails if the call to `syscall::read()` fails for this device.
-    ///
-    /// # Data loss
-    ///
-    /// If `buf` is too small, *exceeding data is discarded*. To be sure that you read
-    /// all data, you should provide a 64kb `buf`.
-    fn read(&mut self, buf: &mut [u8]) -> Result<usize> {
-        use self::Connection::*;
-        match self.connection {
-            Loopback { ref packets }=> {
-                match packets.borrow_mut().pop_front() {
-                    None => Ok(0),
-                    Some(data) => {
-                        for (b, d) in buf.iter_mut().zip(data.iter()) {
-                            *b = *d;
-                        }
-                        // Note: We're discarding excess `data`.
-                        Ok(cmp::min(buf.len(), data.len()))
-                    }
-                }
-            }
-            Device { ref mut init_data, link } => {
-                if !init_data.is_empty() {
-                    let mut data: Vec<u8> = Vec::new();
-                    mem::swap(init_data, &mut data);
-
-                    for (b, d) in buf.iter_mut().zip(data.iter()) {
-                        *b = *d;
-                    }
-
-                    return Ok(cmp::min(buf.len(), data.len()));
-                }
-
-                let mut bytes = [0; MAX_PACKET_LENGTH];
-                let count = try!(syscall::read(link, &mut bytes));
-
-                if let Some(packet) = Ipv4::from_bytes(&bytes[..count]) {
-                    if packet.header.proto == self.proto &&
-                       (packet.header.dst.equals(self.host_addr) || packet.header.dst.equals(Ipv4Addr::BROADCAST)) &&
-                       (packet.header.src.equals(self.peer_addr) || self.peer_addr.equals(Ipv4Addr::BROADCAST)) {
-                        for (b, d) in buf.iter_mut().zip(packet.data.iter()) {
-                            *b = *d;
-                        }
-
-                        return Ok(cmp::min(buf.len(), packet.data.len()));
-                    }
-                }
-
-                Ok(0)
-            }
-        }
-    }
-
-    /// Send data to the peer.
-    ///
-    /// # Errors
-    ///
-    /// Fails if the call to `syscall::write()` fails for this device.
-    fn write(&mut self, buf: &[u8]) -> Result<usize> {
-        use self::Connection::*;
-
-        let ip_data = Vec::from(buf);
-        match self.connection {
-            Loopback { ref packets } => {
-                // Make sure that we're not going to store data that can't be read.
-                let buf =
-                    if buf.len() > MAX_PACKET_LENGTH {
-                        &buf[0..MAX_PACKET_LENGTH]
-                    } else {
-                        buf
-                    };
-                packets.borrow_mut().push_back(buf.to_vec());
-                return Ok(buf.len())
-            }
-            Device { link, .. } => {
-                self.id += 1;
-                let mut ip = Ipv4 {
-                    header: Ipv4Header {
-                        ver_hlen: 0x40 | (mem::size_of::<Ipv4Header>() / 4 & 0xF) as u8, // No Options
-                        services: 0,
-                        len: n16::new((mem::size_of::<Ipv4Header>() + ip_data.len()) as u16), // No Options
-                        id: n16::new(self.id),
-                        flags_fragment: n16::new(0),
-                        ttl: 128,
-                        proto: self.proto,
-                        checksum: Checksum { data: 0 },
-                        src: self.host_addr,
-                        dst: self.peer_addr,
-                    },
-                    options: Vec::new(),
-                    data: ip_data,
-                };
-
-                unsafe {
-                    let header_ptr: *const Ipv4Header = &ip.header;
-                    ip.header.checksum.data =
-                        Checksum::compile(Checksum::sum(header_ptr as usize, mem::size_of::<Ipv4Header>()) +
-                                          Checksum::sum(ip.options.as_ptr() as usize, ip.options.len()));
-                }
-
-                match syscall::write(link, &ip.to_bytes()) {
-                    Ok(_) => Ok(buf.len()),
-                    Err(err) => Err(err),
-                }
-            }
-        }
-    }
-
-    fn sync(&mut self) -> Result<usize> {
-        if let Connection::Device { link, .. } = self.connection {
-            syscall::fsync(link)
-        } else {
-            Ok(0)
-        }
-    }
-}
-
-impl Drop for IpResource {
-    fn drop(&mut self) {
-        if let Connection::Device { link, .. } = self.connection {
-            let _ = syscall::close(link);
-        }
-    }
-}

schemes/ipd/src/scheme.rs

@@ -1,193 +0,0 @@
-use std::cell::RefCell;
-use std::collections::VecDeque;
-use std::rand;
-use std::rc::Rc;
-use std::{str, u16};
-
-use netutils::{getcfg, n16, MacAddr, Ipv4Addr, ArpHeader, Arp, Ipv4};
-use resource_scheme::ResourceScheme;
-use syscall;
-use syscall::error::{Error, Result, EACCES, ENOENT, EINVAL};
-use syscall::flag::O_RDWR;
-
-use resource::*;
-
-/// The IP address of the localhost.
-const LOCALHOST: Ipv4Addr = Ipv4Addr { bytes: [127, 0, 0, 1] };
-
-/// A ARP entry (MAC + IP)
-pub struct ArpEntry {
-    ip: Ipv4Addr,
-    mac: MacAddr,
-}
-
-/// A IP scheme
-pub struct IpScheme {
-    pub arp: RefCell<Vec<ArpEntry>>,
-
-    /// FIFO queue of packets written to the loopback and waiting to be read.
-    ///
-    /// The data stored contains the exact data that has been added by the client
-    /// calling `write()`, without adding any headers.
-    ///
-    /// This buffer is shared between all loopback connections.
-    pub loopback_fifo: Rc<RefCell<VecDeque<Vec<u8>>>>,
-}
-
-impl IpScheme {
-    pub fn new() -> IpScheme {
-        IpScheme {
-            arp: RefCell::new(Vec::new()),
-            loopback_fifo: Rc::new(RefCell::new(VecDeque::new())),
-        }
-    }
-}
-
-impl ResourceScheme<IpResource> for IpScheme {
-    fn open_resource(&self, url: &[u8], _flags: usize, uid: u32, _gid: u32) -> Result<Box<IpResource>> {
-        if uid == 0 {
-            let mac_addr = MacAddr::from_str(&getcfg("mac").map_err(|err| err.into_sys())?);
-            let ip_addr = Ipv4Addr::from_str(&getcfg("ip").map_err(|err| err.into_sys())?);
-            let ip_subnet = Ipv4Addr::from_str(&getcfg("ip_subnet").map_err(|err| err.into_sys())?);
-            let ip_router = Ipv4Addr::from_str(&getcfg("ip_router").map_err(|err| err.into_sys())?);
-
-            let path = try!(str::from_utf8(url).or(Err(Error::new(EINVAL))));
-            let mut parts = path.split('/');
-            if let Some(host_string) = parts.next() {
-                if let Some(proto_string) = parts.next() {
-                    let proto = u8::from_str_radix(proto_string, 16).unwrap_or(0);
-
-                    if ! host_string.is_empty() {
-                        let peer_addr = Ipv4Addr::from_str(host_string);
-                        let mut route_mac = MacAddr::BROADCAST;
-
-                        if ! peer_addr.equals(Ipv4Addr::BROADCAST) {
-                            if peer_addr.equals(LOCALHOST) {
-                                return Ok(Box::new(IpResource {
-                                    connection: Connection::Loopback {
-                                        packets: self.loopback_fifo.clone()
-                                    },
-                                    host_addr: ip_addr,
-                                    peer_addr: peer_addr,
-                                    proto: proto,
-                                    id: (rand() % 65536) as u16,
-                                }));
-                            }
-
-                            let mut needs_routing = false;
-
-                            for octet in 0..4 {
-                                let me = ip_addr.bytes[octet];
-                                let mask = ip_subnet.bytes[octet];
-                                let them = peer_addr.bytes[octet];
-                                if me & mask != them & mask {
-                                    needs_routing = true;
-                                    break;
-                                }
-                            }
-
-                            let route_addr = if needs_routing {
-                                ip_router
-                            } else {
-                                peer_addr
-                            };
-
-                            for entry in self.arp.borrow().iter() {
-                                if entry.ip.equals(route_addr) {
-                                    route_mac = entry.mac;
-                                    break;
-                                }
-                            }
-
-                            if route_mac.equals(MacAddr::BROADCAST) {
-                                if let Ok(link) = syscall::open(&format!("ethernet:{}/806", &route_mac.to_string()), O_RDWR) {
-                                    let arp = Arp {
-                                        header: ArpHeader {
-                                            htype: n16::new(1),
-                                            ptype: n16::new(0x800),
-                                            hlen: 6,
-                                            plen: 4,
-                                            oper: n16::new(1),
-                                            src_mac: mac_addr,
-                                            src_ip: ip_addr,
-                                            dst_mac: route_mac,
-                                            dst_ip: route_addr,
-                                        },
-                                        data: Vec::new(),
-                                    };
-
-                                    match syscall::write(link, &arp.to_bytes()) {
-                                        Ok(_) => loop {
-                                            let mut bytes = [0; 65536];
-                                            match syscall::read(link, &mut bytes) {
-                                                Ok(count) => if let Some(packet) = Arp::from_bytes(&bytes[..count]) {
-                                                    if packet.header.oper.get() == 2 &&
-                                                       packet.header.src_ip.equals(route_addr) {
-                                                        route_mac = packet.header.src_mac;
-                                                        self.arp.borrow_mut().push(ArpEntry {
-                                                            ip: route_addr,
-                                                            mac: route_mac,
-                                                        });
-                                                        break;
-                                                    }
-                                                },
-                                                Err(_) => (),
-                                            }
-                                        },
-                                        Err(err) => println!("IP: ARP Write Failed: {}", err),
-                                    }
-                                }
-                            }
-                        }
-
-                        if let Ok(link) = syscall::open(&format!("ethernet:{}/800", &route_mac.to_string()), O_RDWR) {
-                            return Ok(Box::new(IpResource {
-                                connection: Connection::Device {
-                                    link: link,
-                                    init_data: Vec::new(),
-                                },
-                                host_addr: ip_addr,
-                                peer_addr: peer_addr,
-                                proto: proto,
-                                id: (rand() % 65536) as u16,
-                            }));
-                        }
-                    } else {
-                        while let Ok(link) = syscall::open("ethernet:/800", O_RDWR) {
-                            let mut bytes = [0; 65536];
-                            // FIXME: Blocking call?
-                            match syscall::read(link, &mut bytes) {
-                                Ok(count) => {
-                                    if let Some(packet) = Ipv4::from_bytes(&bytes[..count]) {
-                                        if packet.header.proto == proto &&
-                                           (packet.header.dst.equals(ip_addr) || packet.header.dst.equals(Ipv4Addr::BROADCAST)) {
-                                            return Ok(Box::new(IpResource {
-                                                connection: Connection::Device {
-                                                    link: link,
-                                                    init_data: packet.data,
-                                                },
-                                                host_addr: ip_addr,
-                                                peer_addr: packet.header.src,
-                                                proto: proto,
-                                                id: (rand() % 65536) as u16,
-                                            }));
-                                        }
-                                    }
-                                }
-                                Err(_) => break,
-                            }
-                        }
-                    }
-                } else {
-                    println!("IP: No protocol provided");
-                }
-            } else {
-                println!("IP: No host provided");
-            }
-
-            Err(Error::new(ENOENT))
-        } else {
-            Err(Error::new(EACCES))
-        }
-    }
-}

schemes/orbital

@@ -1 +1 @@
-Subproject commit 601c5685f058c9276d896262195b50c75a6d7a97
+Subproject commit 1d554eda337b9d75a4c0b209c3b399b8f1148f35

schemes/randd/src/main.rs

@@ -16,7 +16,7 @@ impl Scheme for RandScheme {
         Ok(0)
     }
 
-    fn dup(&self, file: usize) -> Result<usize> {
+    fn dup(&self, file: usize, _buf: &[u8]) -> Result<usize> {
         Ok(file)
     }
 

schemes/redoxfs

@@ -1 +1 @@
-Subproject commit 3dcaad55fe6e82450c1691da5d515861a7deed0a
+Subproject commit ec00f58d73de142332e80d097e32f3d93c2a33bf

schemes/tcpd/Cargo.toml

@@ -3,6 +3,7 @@ name = "tcpd"
 version = "0.1.0"
 
 [dependencies]
+event = { path = "../../crates/event/" }
 netutils = { path = "../../programs/netutils/" }
-resource_scheme = { path = "../../crates/resource_scheme/" }
+rand = { git = "https://github.com/redox-os/rand.git" }
 syscall = { path = "../../syscall/" }

schemes/tcpd/src/main.rs

@@ -1,30 +1,680 @@
-#![feature(rand)]
+extern crate event;
-
 extern crate netutils;
-extern crate resource_scheme;
+extern crate rand;
 extern crate syscall;
 
+use rand::{Rng, OsRng};
+use std::collections::{BTreeMap, VecDeque};
+use std::cell::RefCell;
 use std::fs::File;
-use std::io::{Read, Write};
+use std::io::{self, Read, Write};
-use std::thread;
+use std::{mem, slice, str, thread};
+use std::os::unix::io::FromRawFd;
+use std::rc::Rc;
 
-use resource_scheme::ResourceScheme;
+use event::EventQueue;
-use syscall::Packet;
+use netutils::{n16, n32, Ipv4, Ipv4Addr, Ipv4Header, Tcp, TcpHeader, Checksum, TCP_FIN, TCP_SYN, TCP_RST, TCP_PSH, TCP_ACK};
+use syscall::data::Packet;
+use syscall::error::{Error, Result, EACCES, EADDRINUSE, EBADF, EINVAL, EISCONN, EMSGSIZE, ENOTCONN, EWOULDBLOCK};
+use syscall::flag::{EVENT_READ, O_CREAT, O_RDWR, O_NONBLOCK};
+use syscall::scheme::SchemeMut;
 
-use scheme::TcpScheme;
+fn parse_socket(socket: &str) -> (Ipv4Addr, u16) {
+    let mut socket_parts = socket.split(":");
+    let host = Ipv4Addr::from_str(socket_parts.next().unwrap_or(""));
+    let port = socket_parts.next().unwrap_or("").parse::<u16>().unwrap_or(0);
+    (host, port)
+}
 
-mod resource;
+#[derive(Copy, Clone, Debug, Eq, PartialEq)]
-mod scheme;
+enum State {
+    Listen,
+    SynSent,
+    SynReceived,
+    Established,
+    FinWait1,
+    FinWait2,
+    CloseWait,
+    Closing,
+    LastAck,
+    TimeWait,
+    Closed
+}
+
+struct Handle {
+    local: (Ipv4Addr, u16),
+    remote: (Ipv4Addr, u16),
+    flags: usize,
+    events: usize,
+    state: State,
+    seq: u32,
+    ack: u32,
+    data: VecDeque<(Ipv4, Tcp)>,
+    todo_dup: VecDeque<Packet>,
+    todo_read: VecDeque<Packet>,
+    todo_write: VecDeque<Packet>,
+}
+
+impl Handle {
+    fn is_connected(&self) -> bool {
+        self.remote.0 != Ipv4Addr::NULL && self.remote.1 != 0
+    }
+
+    fn read_closed(&self) -> bool {
+        self.state == State::CloseWait || self.state == State::LastAck || self.state == State::TimeWait || self.state == State::Closed
+    }
+
+    fn matches(&self, ip: &Ipv4, tcp: &Tcp) -> bool {
+        // Local address not set or IP dst matches or is broadcast
+        (self.local.0 == Ipv4Addr::NULL || ip.header.dst == self.local.0 || ip.header.dst == Ipv4Addr::BROADCAST)
+        // Local port matches UDP dst
+        && tcp.header.dst.get() == self.local.1
+        // Remote address not set or is broadcast, or IP src matches
+        && (self.remote.0 == Ipv4Addr::NULL || self.remote.0 == Ipv4Addr::BROADCAST || ip.header.src == self.remote.0)
+        // Remote port not set or UDP src matches
+        && (self.remote.1 == 0 || tcp.header.src.get() == self.remote.1)
+    }
+
+    fn create_tcp(&self, flags: u16, data: Vec<u8>) -> Tcp {
+        Tcp {
+            header: TcpHeader {
+                src: n16::new(self.local.1),
+                dst: n16::new(self.remote.1),
+                sequence: n32::new(self.seq),
+                ack_num: n32::new(self.ack),
+                flags: n16::new(((mem::size_of::<TcpHeader>() << 10) & 0xF000) as u16 | (flags & 0xFFF)),
+                window_size: n16::new(8192),
+                checksum: Checksum { data: 0 },
+                urgent_pointer: n16::new(0),
+            },
+            options: Vec::new(),
+            data: data
+        }
+    }
+
+    fn create_ip(&self, id: u16, data: Vec<u8>) -> Ipv4 {
+        Ipv4 {
+            header: Ipv4Header {
+                ver_hlen: 0x45,
+                services: 0,
+                len: n16::new((data.len() + mem::size_of::<Ipv4Header>()) as u16),
+                id: n16::new(id),
+                flags_fragment: n16::new(0),
+                ttl: 127,
+                proto: 0x06,
+                checksum: Checksum { data: 0 },
+                src: self.local.0,
+                dst: self.remote.0
+            },
+            options: Vec::new(),
+            data: data
+        }
+    }
+}
+
+struct Tcpd {
+    scheme_file: File,
+    tcp_file: File,
+    ports: BTreeMap<u16, usize>,
+    next_id: usize,
+    handles: BTreeMap<usize, Handle>,
+    rng: OsRng,
+}
+
+impl Tcpd {
+    fn new(scheme_file: File, tcp_file: File) -> Self {
+        Tcpd {
+            scheme_file: scheme_file,
+            tcp_file: tcp_file,
+            ports: BTreeMap::new(),
+            next_id: 1,
+            handles: BTreeMap::new(),
+            rng: OsRng::new().expect("tcpd: failed to open RNG")
+        }
+    }
+
+    fn scheme_event(&mut self) -> io::Result<()> {
+        loop {
+            let mut packet = Packet::default();
+            if self.scheme_file.read(&mut packet)? == 0 {
+                break;
+            }
+
+            let a = packet.a;
+            self.handle(&mut packet);
+            if packet.a == (-EWOULDBLOCK) as usize {
+                if let Some(mut handle) = self.handles.get_mut(&packet.b) {
+                    match a {
+                        syscall::number::SYS_DUP => {
+                            packet.a = a;
+                            handle.todo_dup.push_back(packet);
+                        },
+                        syscall::number::SYS_READ => {
+                            packet.a = a;
+                            handle.todo_read.push_back(packet);
+                        },
+                        syscall::number::SYS_WRITE => {
+                            packet.a = a;
+                            handle.todo_write.push_back(packet);
+                        },
+                        _ => {
+                            self.scheme_file.write(&packet)?;
+                        }
+                    }
+                }
+            } else {
+                self.scheme_file.write(&packet)?;
+            }
+        }
+
+        Ok(())
+    }
+
+    fn tcp_event(&mut self) -> io::Result<()> {
+        loop {
+            let mut bytes = [0; 65536];
+            let count = self.tcp_file.read(&mut bytes)?;
+            if count == 0 {
+                break;
+            }
+            if let Some(ip) = Ipv4::from_bytes(&bytes[.. count]) {
+                if let Some(tcp) = Tcp::from_bytes(&ip.data) {
+                    let mut closing = Vec::new();
+                    let mut found_connection = false;
+                    for (id, handle) in self.handles.iter_mut() {
+                        if handle.state != State::Listen && handle.matches(&ip, &tcp) {
+                            found_connection = true;
+
+                            match handle.state {
+                                State::SynReceived => if tcp.header.flags.get() & (TCP_SYN | TCP_ACK) == TCP_ACK && tcp.header.ack_num.get() == handle.seq {
+                                    handle.state = State::Established;
+                                },
+                                State::SynSent => if tcp.header.flags.get() & (TCP_SYN | TCP_ACK) == TCP_SYN | TCP_ACK && tcp.header.ack_num.get() == handle.seq {
+                                    handle.state = State::Established;
+                                    handle.ack = tcp.header.sequence.get() + 1;
+
+                                    let tcp = handle.create_tcp(TCP_ACK, Vec::new());
+                                    let ip = handle.create_ip(self.rng.gen(), tcp.to_bytes());
+                                    self.tcp_file.write(&ip.to_bytes())?;
+                                },
+                                State::Established => if tcp.header.flags.get() & (TCP_SYN | TCP_ACK) == TCP_ACK && tcp.header.ack_num.get() == handle.seq {
+                                    handle.ack = tcp.header.sequence.get();
+
+                                    if ! tcp.data.is_empty() {
+                                        handle.data.push_back((ip.clone(), tcp.clone()));
+                                        handle.ack += tcp.data.len() as u32;
+
+                                        let tcp = handle.create_tcp(TCP_ACK, Vec::new());
+                                        let ip = handle.create_ip(self.rng.gen(), tcp.to_bytes());
+                                        self.tcp_file.write(&ip.to_bytes())?;
+                                    } else if tcp.header.flags.get() & TCP_FIN == TCP_FIN {
+                                        handle.state = State::CloseWait;
+
+                                        handle.ack += 1;
+
+                                        let tcp = handle.create_tcp(TCP_ACK, Vec::new());
+                                        let ip = handle.create_ip(self.rng.gen(), tcp.to_bytes());
+                                        self.tcp_file.write(&ip.to_bytes())?;
+                                    }
+                                },
+                                //TODO: Time wait
+                                State::FinWait1 => if tcp.header.flags.get() & (TCP_SYN | TCP_ACK) == TCP_ACK && tcp.header.ack_num.get() == handle.seq {
+                                    handle.ack = tcp.header.sequence.get() + 1;
+
+                                    if tcp.header.flags.get() & TCP_FIN == TCP_FIN {
+                                        handle.state = State::TimeWait;
+
+                                        let tcp = handle.create_tcp(TCP_ACK, Vec::new());
+                                        let ip = handle.create_ip(self.rng.gen(), tcp.to_bytes());
+                                        self.tcp_file.write(&ip.to_bytes())?;
+
+                                        closing.push(*id);
+                                    } else {
+                                        handle.state = State::FinWait2;
+                                    }
+                                },
+                                State::FinWait2 => if tcp.header.flags.get() & (TCP_SYN | TCP_ACK | TCP_FIN) == TCP_ACK | TCP_FIN && tcp.header.ack_num.get() == handle.seq {
+                                    handle.ack = tcp.header.sequence.get() + 1;
+
+                                    handle.state = State::TimeWait;
+
+                                    let tcp = handle.create_tcp(TCP_ACK, Vec::new());
+                                    let ip = handle.create_ip(self.rng.gen(), tcp.to_bytes());
+                                    self.tcp_file.write(&ip.to_bytes())?;
+
+                                    closing.push(*id);
+                                },
+                                State::LastAck => if tcp.header.flags.get() & (TCP_SYN | TCP_ACK) == TCP_ACK && tcp.header.ack_num.get() == handle.seq {
+                                    handle.state = State::Closed;
+                                    closing.push(*id);
+                                },
+                                _ => ()
+                            }
+
+                            while ! handle.todo_read.is_empty() && (! handle.data.is_empty() || handle.read_closed()) {
+                                let mut packet = handle.todo_read.pop_front().unwrap();
+                                let buf = unsafe { slice::from_raw_parts_mut(packet.c as *mut u8, packet.d) };
+                                if let Some((_ip, tcp)) = handle.data.pop_front() {
+                                    let mut i = 0;
+                                    while i < buf.len() && i < tcp.data.len() {
+                                        buf[i] = tcp.data[i];
+                                        i += 1;
+                                    }
+                                    packet.a = i;
+                                } else {
+                                    packet.a = 0;
+                                }
+
+                                self.scheme_file.write(&packet)?;
+                            }
+
+                            if ! handle.todo_write.is_empty() && handle.state == State::Established {
+                                let mut packet = handle.todo_write.pop_front().unwrap();
+                                let buf = unsafe { slice::from_raw_parts(packet.c as *const u8, packet.d) };
+
+                                let tcp = handle.create_tcp(TCP_ACK | TCP_PSH, buf.to_vec());
+                                let ip = handle.create_ip(self.rng.gen(), tcp.to_bytes());
+                                let result = self.tcp_file.write(&ip.to_bytes()).map_err(|err| err.into_sys());
+                                if result.is_ok() {
+                                    handle.seq += buf.len() as u32;
+                                }
+                                packet.a = Error::mux(result.and(Ok(buf.len())));
+
+                                self.scheme_file.write(&packet)?;
+                            }
+
+                            if handle.events & EVENT_READ == EVENT_READ {
+                                if let Some(&(ref _ip, ref tcp)) = handle.data.get(0) {
+                                    self.scheme_file.write(&Packet {
+                                        id: 0,
+                                        pid: 0,
+                                        uid: 0,
+                                        gid: 0,
+                                        a: syscall::number::SYS_FEVENT,
+                                        b: *id,
+                                        c: EVENT_READ,
+                                        d: tcp.data.len()
+                                    })?;
+                                }
+                            }
+                        }
+                    }
+
+                    for file in closing {
+                        let handle = self.handles.remove(&file).unwrap();
+
+                        let remove = if let Some(mut port) = self.ports.get_mut(&handle.local.1) {
+                            *port = *port + 1;
+                            *port == 0
+                        } else {
+                            false
+                        };
+
+                        if remove {
+                            self.ports.remove(&handle.local.1);
+                        }
+                    }
+
+                    if ! found_connection && tcp.header.flags.get() & (TCP_SYN | TCP_ACK) == TCP_SYN {
+                        let mut new_handles = Vec::new();
+
+                        for (_id, handle) in self.handles.iter_mut() {
+                            if handle.state == State::Listen && handle.matches(&ip, &tcp) {
+                                handle.data.push_back((ip.clone(), tcp.clone()));
+
+                                while ! handle.todo_dup.is_empty() && ! handle.data.is_empty() {
+                                    let mut packet = handle.todo_dup.pop_front().unwrap();
+                                    let (ip, tcp) = handle.data.pop_front().unwrap();
+
+                                    let mut new_handle = Handle {
+                                        local: handle.local,
+                                        remote: (ip.header.src, tcp.header.src.get()),
+                                        flags: handle.flags,
+                                        events: 0,
+                                        state: State::SynReceived,
+                                        seq: self.rng.gen(),
+                                        ack: tcp.header.sequence.get() + 1,
+                                        data: VecDeque::new(),
+                                        todo_dup: VecDeque::new(),
+                                        todo_read: VecDeque::new(),
+                                        todo_write: VecDeque::new(),
+                                    };
+
+                                    let tcp = new_handle.create_tcp(TCP_SYN | TCP_ACK, Vec::new());
+                                    let ip = new_handle.create_ip(self.rng.gen(), tcp.to_bytes());
+                                    self.tcp_file.write(&ip.to_bytes())?;
+
+                                    new_handle.seq += 1;
+
+                                    handle.data.retain(|&(ref ip, ref tcp)| {
+                                        if new_handle.matches(ip, tcp) {
+                                            false
+                                        } else {
+                                            true
+                                        }
+                                    });
+
+                                    if let Some(mut port) = self.ports.get_mut(&handle.local.1) {
+                                        *port = *port + 1;
+                                    }
+
+                                    let id = self.next_id;
+                                    self.next_id += 1;
+
+                                    packet.a = id;
+
+                                    new_handles.push((packet, new_handle));
+                                }
+                            }
+                        }
+
+                        for (packet, new_handle) in new_handles {
+                            self.handles.insert(packet.a, new_handle);
+                            self.scheme_file.write(&packet)?;
+                        }
+                    }
+                }
+            }
+        }
+
+        Ok(())
+    }
+}
+
+impl SchemeMut for Tcpd {
+    fn open(&mut self, url: &[u8], flags: usize, uid: u32, _gid: u32) -> Result<usize> {
+        let path = str::from_utf8(url).or(Err(Error::new(EINVAL)))?;
+
+        let mut parts = path.split("/");
+        let remote = parse_socket(parts.next().unwrap_or(""));
+        let mut local = parse_socket(parts.next().unwrap_or(""));
+
+        if local.1 == 0 {
+            local.1 = self.rng.gen_range(32768, 65535);
+        }
+
+        if local.1 <= 1024 && uid != 0 {
+            return Err(Error::new(EACCES));
+        }
+
+        if self.ports.contains_key(&local.1) {
+            return Err(Error::new(EADDRINUSE));
+        }
+
+        let mut handle = Handle {
+            local: local,
+            remote: remote,
+            flags: flags,
+            events: 0,
+            state: State::Listen,
+            seq: 0,
+            ack: 0,
+            data: VecDeque::new(),
+            todo_dup: VecDeque::new(),
+            todo_read: VecDeque::new(),
+            todo_write: VecDeque::new(),
+        };
+
+        if handle.is_connected() {
+            handle.seq = self.rng.gen();
+            handle.ack = 0;
+            handle.state = State::SynSent;
+
+            let tcp = handle.create_tcp(TCP_SYN, Vec::new());
+            let ip = handle.create_ip(self.rng.gen(), tcp.to_bytes());
+            self.tcp_file.write(&ip.to_bytes()).map_err(|err| err.into_sys())?;
+
+            handle.seq += 1;
+        }
+
+        self.ports.insert(local.1, 1);
+
+        let id = self.next_id;
+        self.next_id += 1;
+
+        self.handles.insert(id, handle);
+
+        Ok(id)
+    }
+
+    fn dup(&mut self, file: usize, buf: &[u8]) -> Result<usize> {
+        let path = str::from_utf8(buf).or(Err(Error::new(EINVAL)))?;
+
+        let handle = {
+            let mut handle = self.handles.get_mut(&file).ok_or(Error::new(EBADF))?;
+
+            let mut new_handle = Handle {
+                local: handle.local,
+                remote: handle.remote,
+                flags: handle.flags,
+                events: 0,
+                state: handle.state,
+                seq: handle.seq,
+                ack: handle.ack,
+                data: VecDeque::new(),
+                todo_dup: VecDeque::new(),
+                todo_read: VecDeque::new(),
+                todo_write: VecDeque::new(),
+            };
+
+            if path == "listen" {
+                if handle.is_connected() {
+                    return Err(Error::new(EISCONN));
+                } else if let Some((ip, tcp)) = handle.data.pop_front() {
+                    new_handle.remote = (ip.header.src, tcp.header.src.get());
+
+                    new_handle.seq = self.rng.gen();
+                    new_handle.ack = tcp.header.sequence.get() + 1;
+                    new_handle.state = State::SynReceived;
+
+                    let tcp = new_handle.create_tcp(TCP_SYN | TCP_ACK, Vec::new());
+                    let ip = new_handle.create_ip(self.rng.gen(), tcp.to_bytes());
+                    self.tcp_file.write(&ip.to_bytes()).map_err(|err| err.into_sys()).and(Ok(buf.len()))?;
+
+                    new_handle.seq += 1;
+                } else {
+                    return Err(Error::new(EWOULDBLOCK));
+                }
+
+                handle.data.retain(|&(ref ip, ref tcp)| {
+                    if new_handle.matches(ip, tcp) {
+                        false
+                    } else {
+                        true
+                    }
+                });
+            } else if path.is_empty() {
+                new_handle.data = handle.data.clone();
+            } else if handle.is_connected() {
+                return Err(Error::new(EISCONN));
+            } else {
+                new_handle.remote = parse_socket(path);
+
+                if new_handle.is_connected() {
+                    new_handle.seq = self.rng.gen();
+                    new_handle.ack = 0;
+                    new_handle.state = State::SynSent;
+
+                    handle.data.retain(|&(ref ip, ref tcp)| {
+                        if new_handle.matches(ip, tcp) {
+                            new_handle.data.push_back((ip.clone(), tcp.clone()));
+                            false
+                        } else {
+                            true
+                        }
+                    });
+
+                    let tcp = new_handle.create_tcp(TCP_SYN, Vec::new());
+                    let ip = new_handle.create_ip(self.rng.gen(), tcp.to_bytes());
+                    self.tcp_file.write(&ip.to_bytes()).map_err(|err| err.into_sys()).and(Ok(buf.len()))?;
+                } else {
+                    return Err(Error::new(EINVAL));
+                }
+            }
+
+            new_handle
+        };
+
+        if let Some(mut port) = self.ports.get_mut(&handle.local.1) {
+            *port = *port + 1;
+        }
+
+        let id = self.next_id;
+        self.next_id += 1;
+
+        self.handles.insert(id, handle);
+
+        Ok(id)
+    }
+
+    fn read(&mut self, file: usize, buf: &mut [u8]) -> Result<usize> {
+        let mut handle = self.handles.get_mut(&file).ok_or(Error::new(EBADF))?;
+
+        if ! handle.is_connected() {
+            Err(Error::new(ENOTCONN))
+        } else if let Some((_ip, tcp)) = handle.data.pop_front() {
+            let mut i = 0;
+            while i < buf.len() && i < tcp.data.len() {
+                buf[i] = tcp.data[i];
+                i += 1;
+            }
+
+            Ok(i)
+        } else if handle.flags & O_NONBLOCK == O_NONBLOCK || handle.read_closed() {
+            Ok(0)
+        } else {
+            Err(Error::new(EWOULDBLOCK))
+        }
+    }
+
+    fn write(&mut self, file: usize, buf: &[u8]) -> Result<usize> {
+        let mut handle = self.handles.get_mut(&file).ok_or(Error::new(EBADF))?;
+
+        if ! handle.is_connected() {
+            Err(Error::new(ENOTCONN))
+        } else if buf.len() >= 65507 {
+            Err(Error::new(EMSGSIZE))
+        } else {
+            match handle.state {
+                State::Established => {
+                    let tcp = handle.create_tcp(TCP_ACK | TCP_PSH, buf.to_vec());
+                    let ip = handle.create_ip(self.rng.gen(), tcp.to_bytes());
+                    self.tcp_file.write(&ip.to_bytes()).map_err(|err| err.into_sys())?;
+                    handle.seq += buf.len() as u32;
+                    Ok(buf.len())
+                },
+                _ => {
+                    Err(Error::new(EWOULDBLOCK))
+                }
+            }
+        }
+    }
+
+    fn fevent(&mut self, file: usize, flags: usize) -> Result<usize> {
+        let mut handle = self.handles.get_mut(&file).ok_or(Error::new(EBADF))?;
+
+        handle.events = flags;
+
+        Ok(file)
+    }
+
+    fn fpath(&mut self, id: usize, buf: &mut [u8]) -> Result<usize> {
+        let handle = self.handles.get(&id).ok_or(Error::new(EBADF))?;
+
+        let path_string = format!("tcp:{}:{}/{}:{}", handle.remote.0.to_string(), handle.remote.1, handle.local.0.to_string(), handle.local.1);
+        let path = path_string.as_bytes();
+
+        let mut i = 0;
+        while i < buf.len() && i < path.len() {
+            buf[i] = path[i];
+            i += 1;
+        }
+
+        Ok(i)
+    }
+
+    fn fsync(&mut self, file: usize) -> Result<usize> {
+        let _handle = self.handles.get(&file).ok_or(Error::new(EBADF))?;
+
+        Ok(0)
+    }
+
+    fn close(&mut self, file: usize) -> Result<usize> {
+
+        let closed = {
+            let mut handle = self.handles.get_mut(&file).ok_or(Error::new(EBADF))?;
+
+            match handle.state {
+                State::SynReceived | State::Established => {
+                    handle.state = State::FinWait1;
+
+                    let tcp = handle.create_tcp(TCP_FIN | TCP_ACK, Vec::new());
+                    let ip = handle.create_ip(self.rng.gen(), tcp.to_bytes());
+                    self.tcp_file.write(&ip.to_bytes()).map_err(|err| err.into_sys())?;
+
+                    handle.seq += 1;
+
+                    false
+                },
+                State::CloseWait => {
+                    handle.state = State::LastAck;
+
+                    let tcp = handle.create_tcp(TCP_FIN | TCP_ACK, Vec::new());
+                    let ip = handle.create_ip(self.rng.gen(), tcp.to_bytes());
+                    self.tcp_file.write(&ip.to_bytes()).map_err(|err| err.into_sys())?;
+
+                    handle.seq += 1;
+
+                    false
+                },
+                _ => true
+            }
+        };
+
+        if closed {
+            let handle = self.handles.remove(&file).ok_or(Error::new(EBADF))?;
+
+            let remove = if let Some(mut port) = self.ports.get_mut(&handle.local.1) {
+                *port = *port + 1;
+                *port == 0
+            } else {
+                false
+            };
+
+            if remove {
+                self.ports.remove(&handle.local.1);
+            }
+        }
+
+        Ok(0)
+    }
+}
 
 fn main() {
     thread::spawn(move || {
-        let mut socket = File::create(":tcp").expect("tcpd: failed to create tcp scheme");
+        let scheme_fd = syscall::open(":tcp", O_RDWR | O_CREAT | O_NONBLOCK).expect("tcpd: failed to create :tcp");
-        let scheme = TcpScheme;
+        let scheme_file = unsafe { File::from_raw_fd(scheme_fd) };
-        loop {
+
-            let mut packet = Packet::default();
+        let tcp_fd = syscall::open("ip:6", O_RDWR | O_NONBLOCK).expect("tcpd: failed to open ip:6");
-            socket.read(&mut packet).expect("tcpd: failed to read events from tcp scheme");
+        let tcp_file = unsafe { File::from_raw_fd(tcp_fd) };
-            scheme.handle(&mut packet);
+
-            socket.write(&packet).expect("tcpd: failed to write responses to tcp scheme");
+        let tcpd = Rc::new(RefCell::new(Tcpd::new(scheme_file, tcp_file)));
-        }
+
+        let mut event_queue = EventQueue::<()>::new().expect("tcpd: failed to create event queue");
+
+        let tcp_tcpd = tcpd.clone();
+        event_queue.add(tcp_fd, move |_count: usize| -> io::Result<Option<()>> {
+            tcp_tcpd.borrow_mut().tcp_event()?;
+            Ok(None)
+        }).expect("tcpd: failed to listen to events on ip:6");
+
+        event_queue.add(scheme_fd, move |_count: usize| -> io::Result<Option<()>> {
+            tcpd.borrow_mut().scheme_event()?;
+            Ok(None)
+        }).expect("tcpd: failed to listen to events on :tcp");
+
+        event_queue.trigger_all(0).expect("tcpd: failed to trigger event queue");
+
+        event_queue.run().expect("tcpd: failed to run event queue");
     });
 }

schemes/tcpd/src/resource.rs

@@ -1,328 +0,0 @@
-use std::{cmp, mem};
-use std::cell::UnsafeCell;
-use std::sync::Arc;
-
-use netutils::{n16, n32, Ipv4Addr, Checksum, Tcp, TcpHeader, TCP_SYN, TCP_PSH, TCP_FIN, TCP_ACK};
-use resource_scheme::Resource;
-use syscall;
-use syscall::error::*;
-
-pub struct TcpStream {
-    pub ip: usize,
-    pub host_addr: Ipv4Addr,
-    pub peer_addr: Ipv4Addr,
-    pub peer_port: u16,
-    pub host_port: u16,
-    pub sequence: u32,
-    pub acknowledge: u32,
-    pub finished: bool
-}
-
-impl TcpStream {
-    fn path(&self, buf: &mut [u8]) -> Result<usize> {
-        let path_string = format!("tcp:{}:{}/{}", self.peer_addr.to_string(), self.peer_port, self.host_port);
-        let path = path_string.as_bytes();
-
-        for (b, p) in buf.iter_mut().zip(path.iter()) {
-            *b = *p;
-        }
-
-        Ok(cmp::min(buf.len(), path.len()))
-    }
-
-    fn read(&mut self, buf: &mut [u8]) -> Result<usize> {
-        if self.finished {
-            return Ok(0);
-        }
-
-        loop {
-            let mut bytes = [0; 65536];
-            let count = try!(syscall::read(self.ip, &mut bytes));
-
-            if let Some(segment) = Tcp::from_bytes(&bytes[..count]) {
-                if segment.header.dst.get() == self.host_port && segment.header.src.get() == self.peer_port {
-                    //println!("Read: {}=={} {:X}: {}", segment.header.sequence.get(), self.acknowledge, segment.header.flags.get(), segment.data.len());
-
-                    if self.acknowledge == segment.header.sequence.get() {
-                        if segment.header.flags.get() & TCP_FIN == TCP_FIN {
-                            self.finished = true;
-                        }
-
-                        if segment.header.flags.get() & (TCP_SYN | TCP_ACK) == TCP_ACK {
-                            let flags = if self.finished {
-                                TCP_ACK | TCP_FIN
-                            } else {
-                                TCP_ACK
-                            };
-
-                            // Send ACK
-                            self.acknowledge += segment.data.len() as u32;
-                            let mut tcp = Tcp {
-                                header: TcpHeader {
-                                    src: n16::new(self.host_port),
-                                    dst: n16::new(self.peer_port),
-                                    sequence: n32::new(self.sequence),
-                                    ack_num: n32::new(self.acknowledge),
-                                    flags: n16::new(((mem::size_of::<TcpHeader>() << 10) & 0xF000) as u16 | flags),
-                                    window_size: n16::new(65535),
-                                    checksum: Checksum {
-                                        data: 0
-                                    },
-                                    urgent_pointer: n16::new(0)
-                                },
-                                options: Vec::new(),
-                                data: Vec::new()
-                            };
-
-                            tcp.checksum(&self.host_addr, &self.peer_addr);
-
-                            //println!("Sending read ack: {} {} {:X}", tcp.header.sequence.get(), tcp.header.ack_num.get(), tcp.header.flags.get());
-
-                            let _ = syscall::write(self.ip, &tcp.to_bytes());
-
-                            // TODO: Support broken packets (one packet in two buffers)
-                            let mut i = 0;
-                            while i < buf.len() && i < segment.data.len() {
-                                buf[i] = segment.data[i];
-                                i += 1;
-                            }
-                            return Ok(i);
-                        }
-                    } else {
-                        println!("TCP: MISMATCH: {}=={}", segment.header.sequence.get(), self.acknowledge);
-                    }
-                } else {
-                    println!("TCP: WRONG PORT {}=={} && {}=={}", segment.header.dst.get(), self.host_port, segment.header.src.get(), self.peer_port);
-                }
-            }
-        }
-    }
-
-    fn write(&mut self, buf: &[u8]) -> Result<usize> {
-        let tcp_data = Vec::from(buf);
-
-        let mut tcp = Tcp {
-            header: TcpHeader {
-                src: n16::new(self.host_port),
-                dst: n16::new(self.peer_port),
-                sequence: n32::new(self.sequence),
-                ack_num: n32::new(self.acknowledge),
-                flags: n16::new((((mem::size_of::<TcpHeader>()) << 10) & 0xF000) as u16 | TCP_PSH |
-                                TCP_ACK),
-                window_size: n16::new(65535),
-                checksum: Checksum { data: 0 },
-                urgent_pointer: n16::new(0),
-            },
-            options: Vec::new(),
-            data: tcp_data,
-        };
-
-        tcp.checksum(&self.host_addr, &self.peer_addr);
-
-        match syscall::write(self.ip, &tcp.to_bytes()) {
-            Ok(size) => {
-                loop {
-                    // Wait for ACK
-                    let mut bytes = [0; 65536];
-                    match syscall::read(self.ip, &mut bytes) {
-                        Ok(count) => {
-                            if let Some(segment) = Tcp::from_bytes(&bytes[..count]) {
-                                if segment.header.dst.get() == self.host_port &&
-                                   segment.header.src.get() == self.peer_port {
-                                    return if (segment.header.flags.get() & (TCP_SYN | TCP_ACK)) == TCP_ACK {
-                                        self.sequence = segment.header.ack_num.get();
-                                        self.acknowledge = segment.header.sequence.get();
-                                        Ok(size)
-                                    } else {
-                                        Err(Error::new(EPIPE))
-                                    };
-                                }
-                            }
-                        }
-                        Err(err) => return Err(err),
-                    }
-                }
-            }
-            Err(err) => Err(err),
-        }
-    }
-
-    fn sync(&mut self) -> Result<usize> {
-        syscall::fsync(self.ip)
-    }
-
-    /// Etablish client
-    pub fn client_establish(&mut self) -> bool {
-        // Send SYN
-        let mut tcp = Tcp {
-            header: TcpHeader {
-                src: n16::new(self.host_port),
-                dst: n16::new(self.peer_port),
-                sequence: n32::new(self.sequence),
-                ack_num: n32::new(self.acknowledge),
-                flags: n16::new(((mem::size_of::<TcpHeader>() << 10) & 0xF000) as u16 | TCP_SYN),
-                window_size: n16::new(65535),
-                checksum: Checksum { data: 0 },
-                urgent_pointer: n16::new(0),
-            },
-            options: Vec::new(),
-            data: Vec::new(),
-        };
-
-        tcp.checksum(&self.host_addr, &self.peer_addr);
-
-        match syscall::write(self.ip, &tcp.to_bytes()) {
-            Ok(_) => {
-                loop {
-                    // Wait for SYN-ACK
-                    let mut bytes = [0; 65536];
-                    match syscall::read(self.ip, &mut bytes) {
-                        Ok(count) => {
-                            if let Some(segment) = Tcp::from_bytes(&bytes[..count]) {
-                                if segment.header.dst.get() == self.host_port &&
-                                   segment.header.src.get() == self.peer_port {
-                                    return if segment.header.flags.get() & (TCP_SYN | TCP_ACK) == TCP_SYN | TCP_ACK {
-                                        self.sequence = segment.header.ack_num.get();
-                                        self.acknowledge = segment.header.sequence.get();
-
-                                        self.acknowledge += 1;
-                                        tcp = Tcp {
-                                            header: TcpHeader {
-                                                src: n16::new(self.host_port),
-                                                dst: n16::new(self.peer_port),
-                                                sequence: n32::new(self.sequence),
-                                                ack_num: n32::new(self.acknowledge),
-                                                flags: n16::new(((mem::size_of::<TcpHeader>() << 10) & 0xF000) as u16 | TCP_ACK),
-                                                window_size: n16::new(65535),
-                                                checksum: Checksum {
-                                                    data: 0
-                                                },
-                                                urgent_pointer: n16::new(0)
-                                            },
-                                            options: Vec::new(),
-                                            data: Vec::new()
-                                        };
-
-                                        tcp.checksum(&self.host_addr, &self.peer_addr);
-
-                                        let _ = syscall::write(self.ip, &tcp.to_bytes());
-
-                                        true
-                                    } else {
-                                        false
-                                    };
-                                }
-                            }
-                        }
-                        Err(_) => return false,
-                    }
-                }
-            }
-            Err(_) => false,
-        }
-    }
-
-    /// Try to establish a server connection
-    pub fn server_establish(&mut self, _: Tcp) -> bool {
-        // Send SYN-ACK
-        self.acknowledge += 1;
-        let mut tcp = Tcp {
-            header: TcpHeader {
-                src: n16::new(self.host_port),
-                dst: n16::new(self.peer_port),
-                sequence: n32::new(self.sequence),
-                ack_num: n32::new(self.acknowledge),
-                flags: n16::new(((mem::size_of::<TcpHeader>() << 10) & 0xF000) as u16 | TCP_SYN |
-                                TCP_ACK),
-                window_size: n16::new(65535),
-                checksum: Checksum { data: 0 },
-                urgent_pointer: n16::new(0),
-            },
-            options: Vec::new(),
-            data: Vec::new(),
-        };
-
-        tcp.checksum(&self.host_addr, &self.peer_addr);
-
-        match syscall::write(self.ip, &tcp.to_bytes()) {
-            Ok(_) => {
-                loop {
-                    // Wait for ACK
-                    let mut bytes = [0; 65536];
-                    match syscall::read(self.ip, &mut bytes) {
-                        Ok(count ) => {
-                            if let Some(segment) = Tcp::from_bytes(&bytes[..count]) {
-                                if segment.header.dst.get() == self.host_port &&
-                                   segment.header.src.get() == self.peer_port {
-                                    return if segment.header.flags.get() & (TCP_SYN | TCP_ACK) == TCP_ACK {
-                                        self.sequence = segment.header.ack_num.get();
-                                        self.acknowledge = segment.header.sequence.get();
-                                        true
-                                    } else {
-                                        false
-                                    };
-                                }
-                            }
-                        }
-                        Err(_) => return false,
-                    }
-                }
-            }
-            Err(_) => false,
-        }
-    }
-}
-
-impl Drop for TcpStream {
-    fn drop(&mut self) {
-        // Send FIN-ACK
-        let mut tcp = Tcp {
-            header: TcpHeader {
-                src: n16::new(self.host_port),
-                dst: n16::new(self.peer_port),
-                sequence: n32::new(self.sequence),
-                ack_num: n32::new(self.acknowledge),
-                flags: n16::new((((mem::size_of::<TcpHeader>()) << 10) & 0xF000) as u16 | TCP_FIN | TCP_ACK),
-                window_size: n16::new(65535),
-                checksum: Checksum { data: 0 },
-                urgent_pointer: n16::new(0),
-            },
-            options: Vec::new(),
-            data: Vec::new(),
-        };
-
-        tcp.checksum(&self.host_addr, &self.peer_addr);
-
-        let _ = syscall::write(self.ip, &tcp.to_bytes());
-        let _ = syscall::close(self.ip);
-    }
-}
-
-/// A TCP resource
-pub struct TcpResource {
-    pub stream: Arc<UnsafeCell<TcpStream>>
-}
-
-impl Resource for TcpResource {
-    fn dup(&self) -> Result<Box<TcpResource>> {
-        Ok(Box::new(TcpResource {
-            stream: self.stream.clone()
-        }))
-    }
-
-    fn path(&self, buf: &mut [u8]) -> Result<usize> {
-        unsafe { (*self.stream.get()).path(buf) }
-    }
-
-    fn read(&mut self, buf: &mut [u8]) -> Result<usize> {
-        unsafe { (*self.stream.get()).read(buf) }
-    }
-
-    fn write(&mut self, buf: &[u8]) -> Result<usize> {
-        unsafe { (*self.stream.get()).write(buf) }
-    }
-
-    fn sync(&mut self) -> Result<usize> {
-        unsafe { (*self.stream.get()).sync() }
-    }
-}

schemes/tcpd/src/scheme.rs

@@ -1,98 +0,0 @@
-use std::cell::UnsafeCell;
-use std::rand;
-use std::sync::Arc;
-use std::{str, u16};
-
-use netutils::{getcfg, Ipv4Addr, Tcp, TCP_SYN, TCP_ACK};
-use resource_scheme::ResourceScheme;
-use syscall;
-use syscall::error::{Error, Result, ENOENT, EINVAL};
-use syscall::flag::O_RDWR;
-
-use resource::{TcpResource, TcpStream};
-
-/// A TCP scheme
-pub struct TcpScheme;
-
-impl ResourceScheme<TcpResource> for TcpScheme {
-    fn open_resource(&self, url: &[u8], _flags: usize, _uid: u32, _gid: u32) -> Result<Box<TcpResource>> {
-        let ip_addr = Ipv4Addr::from_str(&getcfg("ip").map_err(|err| err.into_sys())?);
-
-        let path = try!(str::from_utf8(url).or(Err(Error::new(EINVAL))));
-        let mut parts = path.split('/');
-        let remote = parts.next().unwrap_or("");
-        let path = parts.next().unwrap_or("");
-
-        let mut remote_parts = remote.split(':');
-        let host = remote_parts.next().unwrap_or("");
-        let port = remote_parts.next().unwrap_or("");
-
-        if ! host.is_empty() && ! port.is_empty() {
-            let peer_addr = Ipv4Addr::from_str(host);
-            let peer_port = port.parse::<u16>().unwrap_or(0);
-            let host_port = (rand() % 32768 + 32768) as u16;
-
-            match syscall::open(&format!("ip:{}/6", peer_addr.to_string()), O_RDWR) {
-                Ok(ip) => {
-                    let mut stream = TcpStream {
-                        ip: ip,
-                        host_addr: ip_addr,
-                        peer_addr: peer_addr,
-                        peer_port: peer_port,
-                        host_port: host_port,
-                        sequence: rand() as u32,
-                        acknowledge: 0,
-                        finished: false
-                    };
-
-                    if stream.client_establish() {
-                        return Ok(Box::new(TcpResource {
-                            stream: Arc::new(UnsafeCell::new(stream))
-                        }));
-                    }
-                }
-                Err(err) => return Err(err),
-            }
-        } else if ! path.is_empty() {
-            let host_port = path.parse::<u16>().unwrap_or(0);
-
-            while let Ok(ip) = syscall::open("ip:/6", O_RDWR) {
-                let mut bytes = [0; 65536];
-                match syscall::read(ip, &mut bytes) {
-                    Ok(count) => {
-                        if let Some(segment) = Tcp::from_bytes(&bytes[..count]) {
-                            if segment.header.dst.get() == host_port && segment.header.flags.get() & (TCP_SYN | TCP_ACK) == TCP_SYN {
-                                let mut path = [0; 256];
-                                if let Ok(path_count) = syscall::fpath(ip, &mut path) {
-                                    let ip_reference = unsafe { str::from_utf8_unchecked(&path[.. path_count]) }.split(':').nth(1).unwrap_or("");
-                                    let ip_remote = ip_reference.split('/').next().unwrap_or("");
-                                    let peer_addr = ip_remote.split(':').next().unwrap_or("");
-
-                                    let mut stream = TcpStream {
-                                        ip: ip,
-                                        host_addr: ip_addr,
-                                        peer_addr: Ipv4Addr::from_str(peer_addr),
-                                        peer_port: segment.header.src.get(),
-                                        host_port: host_port,
-                                        sequence: rand() as u32,
-                                        acknowledge: segment.header.sequence.get(),
-                                        finished: false
-                                    };
-
-                                    if stream.server_establish(segment) {
-                                        return Ok(Box::new(TcpResource {
-                                            stream: Arc::new(UnsafeCell::new(stream))
-                                        }));
-                                    }
-                                }
-                            }
-                        }
-                    }
-                    Err(err) => return Err(err),
-                }
-            }
-        }
-
-        Err(Error::new(ENOENT))
-    }
-}

schemes/udpd/Cargo.toml

@@ -3,6 +3,7 @@ name = "udpd"
 version = "0.1.0"
 
 [dependencies]
+event = { path = "../../crates/event/" }
 netutils = { path = "../../programs/netutils/" }
-resource_scheme = { path = "../../crates/resource_scheme/" }
+rand = { git = "https://github.com/redox-os/rand.git" }
 syscall = { path = "../../syscall/" }

schemes/udpd/src/main.rs

@@ -1,30 +1,348 @@
-#![feature(rand)]
+extern crate event;
-
 extern crate netutils;
-extern crate resource_scheme;
+extern crate rand;
 extern crate syscall;
 
+use rand::{Rng, OsRng};
+use std::collections::{BTreeMap, VecDeque};
+use std::cell::RefCell;
 use std::fs::File;
-use std::io::{Read, Write};
+use std::io::{self, Read, Write};
-use std::thread;
+use std::{mem, slice, str, thread};
+use std::os::unix::io::FromRawFd;
+use std::rc::Rc;
 
-use resource_scheme::ResourceScheme;
+use event::EventQueue;
-use syscall::Packet;
+use netutils::{n16, Ipv4, Ipv4Addr, Ipv4Header, Udp, UdpHeader, Checksum};
+use syscall::data::Packet;
+use syscall::error::{Error, Result, EACCES, EADDRINUSE, EBADF, EINVAL, EMSGSIZE, ENOTCONN, EWOULDBLOCK};
+use syscall::flag::{EVENT_READ, O_CREAT, O_RDWR, O_NONBLOCK};
+use syscall::scheme::SchemeMut;
 
-use scheme::UdpScheme;
+fn parse_socket(socket: &str) -> (Ipv4Addr, u16) {
+    let mut socket_parts = socket.split(":");
+    let host = Ipv4Addr::from_str(socket_parts.next().unwrap_or(""));
+    let port = socket_parts.next().unwrap_or("").parse::<u16>().unwrap_or(0);
+    (host, port)
+}
 
-mod resource;
+struct Handle {
-mod scheme;
+    local: (Ipv4Addr, u16),
+    remote: (Ipv4Addr, u16),
+    flags: usize,
+    events: usize,
+    data: VecDeque<Vec<u8>>,
+    todo: VecDeque<Packet>,
+}
+
+struct Udpd {
+    scheme_file: File,
+    udp_file: File,
+    ports: BTreeMap<u16, usize>,
+    next_id: usize,
+    handles: BTreeMap<usize, Handle>,
+    rng: OsRng,
+}
+
+impl Udpd {
+    fn new(scheme_file: File, udp_file: File) -> Self {
+        Udpd {
+            scheme_file: scheme_file,
+            udp_file: udp_file,
+            ports: BTreeMap::new(),
+            next_id: 1,
+            handles: BTreeMap::new(),
+            rng: OsRng::new().expect("udpd: failed to open RNG")
+        }
+    }
+
+    fn scheme_event(&mut self) -> io::Result<()> {
+        loop {
+            let mut packet = Packet::default();
+            if self.scheme_file.read(&mut packet)? == 0 {
+                break;
+            }
+
+            let a = packet.a;
+            self.handle(&mut packet);
+            if packet.a == (-EWOULDBLOCK) as usize {
+                packet.a = a;
+                if let Some(mut handle) = self.handles.get_mut(&packet.b) {
+                    handle.todo.push_back(packet);
+                }
+            } else {
+                self.scheme_file.write(&packet)?;
+            }
+        }
+
+        Ok(())
+    }
+
+    fn udp_event(&mut self) -> io::Result<()> {
+        loop {
+            let mut bytes = [0; 65536];
+            let count = self.udp_file.read(&mut bytes)?;
+            if count == 0 {
+                break;
+            }
+            if let Some(ip) = Ipv4::from_bytes(&bytes[.. count]) {
+                if let Some(udp) = Udp::from_bytes(&ip.data) {
+                    for (id, handle) in self.handles.iter_mut() {
+                            // Local address not set or IP dst matches or is broadcast
+                        if (handle.local.0 == Ipv4Addr::NULL || ip.header.dst == handle.local.0 || ip.header.dst == Ipv4Addr::BROADCAST)
+                            // Local port matches UDP dst
+                            && udp.header.dst.get() == handle.local.1
+                            // Remote address not set or is broadcast, or IP src matches
+                            && (handle.remote.0 == Ipv4Addr::NULL || handle.remote.0 == Ipv4Addr::BROADCAST || ip.header.src == handle.remote.0)
+                            // Remote port not set or UDP src matches
+                            && (handle.remote.1 == 0 || udp.header.src.get() == handle.remote.1)
+                        {
+                            handle.data.push_back(udp.data.clone());
+
+                            while ! handle.todo.is_empty() && ! handle.data.is_empty() {
+                                let mut packet = handle.todo.pop_front().unwrap();
+                                let buf = unsafe { slice::from_raw_parts_mut(packet.c as *mut u8, packet.d) };
+                                let data = handle.data.pop_front().unwrap();
+
+                                let mut i = 0;
+                                while i < buf.len() && i < data.len() {
+                                    buf[i] = data[i];
+                                    i += 1;
+                                }
+                                packet.a = i;
+
+                                self.scheme_file.write(&packet)?;
+                            }
+
+                            if handle.events & EVENT_READ == EVENT_READ {
+                                if let Some(data) = handle.data.get(0) {
+                                    self.scheme_file.write(&Packet {
+                                        id: 0,
+                                        pid: 0,
+                                        uid: 0,
+                                        gid: 0,
+                                        a: syscall::number::SYS_FEVENT,
+                                        b: *id,
+                                        c: EVENT_READ,
+                                        d: data.len()
+                                    })?;
+                                }
+                            }
+                        }
+                    }
+                }
+            }
+        }
+
+        Ok(())
+    }
+}
+
+impl SchemeMut for Udpd {
+    fn open(&mut self, url: &[u8], flags: usize, uid: u32, _gid: u32) -> Result<usize> {
+        let path = str::from_utf8(url).or(Err(Error::new(EINVAL)))?;
+
+        let mut parts = path.split("/");
+        let remote = parse_socket(parts.next().unwrap_or(""));
+        let mut local = parse_socket(parts.next().unwrap_or(""));
+
+        if local.1 == 0 {
+            local.1 = self.rng.gen_range(32768, 65535);
+        }
+
+        if local.1 <= 1024 && uid != 0 {
+            return Err(Error::new(EACCES));
+        }
+
+        if self.ports.contains_key(&local.1) {
+            return Err(Error::new(EADDRINUSE));
+        }
+
+        self.ports.insert(local.1, 1);
+
+        let id = self.next_id;
+        self.next_id += 1;
+
+        self.handles.insert(id, Handle {
+            local: local,
+            remote: remote,
+            flags: flags,
+            events: 0,
+            data: VecDeque::new(),
+            todo: VecDeque::new(),
+        });
+
+        Ok(id)
+    }
+
+    fn dup(&mut self, file: usize, buf: &[u8]) -> Result<usize> {
+        let mut handle = {
+            let handle = self.handles.get(&file).ok_or(Error::new(EBADF))?;
+            Handle {
+                local: handle.local,
+                remote: handle.remote,
+                flags: handle.flags,
+                events: 0,
+                data: handle.data.clone(),
+                todo: VecDeque::new(),
+            }
+        };
+
+        let path = str::from_utf8(buf).or(Err(Error::new(EINVAL)))?;
+
+        if handle.remote.0 == Ipv4Addr::NULL || handle.remote.1 == 0 {
+            handle.remote = parse_socket(path);
+        }
+
+        if let Some(mut port) = self.ports.get_mut(&handle.local.1) {
+            *port = *port + 1;
+        }
+
+        let id = self.next_id;
+        self.next_id += 1;
+
+        self.handles.insert(id, handle);
+
+        Ok(id)
+    }
+
+    fn read(&mut self, file: usize, buf: &mut [u8]) -> Result<usize> {
+        let mut handle = self.handles.get_mut(&file).ok_or(Error::new(EBADF))?;
+
+        if handle.remote.0 == Ipv4Addr::NULL || handle.remote.1 == 0 {
+            Err(Error::new(ENOTCONN))
+        } else if let Some(data) = handle.data.pop_front() {
+            let mut i = 0;
+            while i < buf.len() && i < data.len() {
+                buf[i] = data[i];
+                i += 1;
+            }
+
+            Ok(i)
+        } else if handle.flags & O_NONBLOCK == O_NONBLOCK {
+            Ok(0)
+        } else {
+            Err(Error::new(EWOULDBLOCK))
+        }
+    }
+
+    fn write(&mut self, file: usize, buf: &[u8]) -> Result<usize> {
+        let handle = self.handles.get(&file).ok_or(Error::new(EBADF))?;
+
+        if handle.remote.0 == Ipv4Addr::NULL || handle.remote.1 == 0 {
+            Err(Error::new(ENOTCONN))
+        } else if buf.len() >= 65507 {
+            Err(Error::new(EMSGSIZE))
+        } else {
+            let udp_data = buf.to_vec();
+
+            let udp = Udp {
+                header: UdpHeader {
+                    src: n16::new(handle.local.1),
+                    dst: n16::new(handle.remote.1),
+                    len: n16::new((udp_data.len() + mem::size_of::<UdpHeader>()) as u16),
+                    checksum: Checksum { data: 0 }
+                },
+                data: udp_data
+            };
+
+            let ip_data = udp.to_bytes();
+
+            let ip = Ipv4 {
+                header: Ipv4Header {
+                    ver_hlen: 0x45,
+                    services: 0,
+                    len: n16::new((ip_data.len() + mem::size_of::<Ipv4Header>()) as u16),
+                    id: n16::new(self.rng.gen()),
+                    flags_fragment: n16::new(0),
+                    ttl: 127,
+                    proto: 0x11,
+                    checksum: Checksum { data: 0 },
+                    src: handle.local.0,
+                    dst: handle.remote.0
+                },
+                options: Vec::new(),
+                data: ip_data
+            };
+
+            self.udp_file.write(&ip.to_bytes()).map_err(|err| err.into_sys()).and(Ok(buf.len()))
+        }
+    }
+
+    fn fevent(&mut self, file: usize, flags: usize) -> Result<usize> {
+        let mut handle = self.handles.get_mut(&file).ok_or(Error::new(EBADF))?;
+
+        handle.events = flags;
+
+        Ok(file)
+    }
+
+    fn fpath(&mut self, id: usize, buf: &mut [u8]) -> Result<usize> {
+        let handle = self.handles.get(&id).ok_or(Error::new(EBADF))?;
+
+        let path_string = format!("udp:{}:{}/{}:{}", handle.remote.0.to_string(), handle.remote.1, handle.local.0.to_string(), handle.local.1);
+        let path = path_string.as_bytes();
+
+        let mut i = 0;
+        while i < buf.len() && i < path.len() {
+            buf[i] = path[i];
+            i += 1;
+        }
+
+        Ok(i)
+    }
+
+    fn fsync(&mut self, file: usize) -> Result<usize> {
+        let _handle = self.handles.get(&file).ok_or(Error::new(EBADF))?;
+
+        Ok(0)
+    }
+
+    fn close(&mut self, file: usize) -> Result<usize> {
+        let handle = self.handles.remove(&file).ok_or(Error::new(EBADF))?;
+
+        let remove = if let Some(mut port) = self.ports.get_mut(&handle.local.1) {
+            *port = *port + 1;
+            *port == 0
+        } else {
+            false
+        };
+
+        if remove {
+            drop(self.ports.remove(&handle.local.1));
+        }
+
+        drop(handle);
+
+        Ok(0)
+    }
+}
 
 fn main() {
     thread::spawn(move || {
-        let mut socket = File::create(":udp").expect("udpd: failed to create udp scheme");
+        let scheme_fd = syscall::open(":udp", O_RDWR | O_CREAT | O_NONBLOCK).expect("udpd: failed to create :udp");
-        let scheme = UdpScheme;
+        let scheme_file = unsafe { File::from_raw_fd(scheme_fd) };
-        loop {
+
-            let mut packet = Packet::default();
+        let udp_fd = syscall::open("ip:11", O_RDWR | O_NONBLOCK).expect("udpd: failed to open ip:11");
-            socket.read(&mut packet).expect("udpd: failed to read events from udp scheme");
+        let udp_file = unsafe { File::from_raw_fd(udp_fd) };
-            scheme.handle(&mut packet);
+
-            socket.write(&packet).expect("udpd: failed to write responses to udp scheme");
+        let udpd = Rc::new(RefCell::new(Udpd::new(scheme_file, udp_file)));
-        }
+
+        let mut event_queue = EventQueue::<()>::new().expect("udpd: failed to create event queue");
+
+        let udp_udpd = udpd.clone();
+        event_queue.add(udp_fd, move |_count: usize| -> io::Result<Option<()>> {
+            udp_udpd.borrow_mut().udp_event()?;
+            Ok(None)
+        }).expect("udpd: failed to listen to events on ip:11");
+
+        event_queue.add(scheme_fd, move |_count: usize| -> io::Result<Option<()>> {
+            udpd.borrow_mut().scheme_event()?;
+            Ok(None)
+        }).expect("udpd: failed to listen to events on :udp");
+
+        event_queue.trigger_all(0).expect("udpd: failed to trigger event queue");
+
+        event_queue.run().expect("udpd: failed to run event queue");
     });
 }

schemes/udpd/src/resource.rs

@@ -1,115 +0,0 @@
-use std::{cmp, mem};
-
-use netutils::{n16, Ipv4Addr, Checksum, Udp, UdpHeader};
-use resource_scheme::Resource;
-use syscall;
-use syscall::error::*;
-
-/// UDP resource
-pub struct UdpResource {
-    pub ip: usize,
-    pub data: Vec<u8>,
-    pub host_addr: Ipv4Addr,
-    pub peer_addr: Ipv4Addr,
-    pub peer_port: u16,
-    pub host_port: u16,
-}
-
-impl Resource for UdpResource {
-    fn dup(&self) -> Result<Box<UdpResource>> {
-        match syscall::dup(self.ip) {
-            Ok(ip) => {
-                Ok(Box::new(UdpResource {
-                    ip: ip,
-                    data: self.data.clone(),
-                    host_addr: self.host_addr,
-                    peer_addr: self.peer_addr,
-                    peer_port: self.peer_port,
-                    host_port: self.host_port,
-                }))
-            }
-            Err(err) => Err(err),
-        }
-    }
-
-    fn path(&self, buf: &mut [u8]) -> Result<usize> {
-        let path_string = format!("udp:{}:{}/{}", self.peer_addr.to_string(), self.peer_port, self.host_port);
-        let path = path_string.as_bytes();
-
-        for (b, p) in buf.iter_mut().zip(path.iter()) {
-            *b = *p;
-        }
-
-        Ok(cmp::min(buf.len(), path.len()))
-    }
-
-    fn read(&mut self, buf: &mut [u8]) -> Result<usize> {
-        if ! self.data.is_empty() {
-            let mut bytes: Vec<u8> = Vec::new();
-            mem::swap(&mut self.data, &mut bytes);
-
-            // TODO: Allow splitting
-            let mut i = 0;
-            while i < buf.len() && i < bytes.len() {
-                buf[i] = bytes[i];
-                i += 1;
-            }
-
-            return Ok(i);
-        }
-
-        loop {
-            let mut bytes = [0; 65536];
-            let count = try!(syscall::read(self.ip, &mut bytes));
-
-            if let Some(datagram) = Udp::from_bytes(&bytes[..count]) {
-                if datagram.header.dst.get() == self.host_port &&
-                   datagram.header.src.get() == self.peer_port {
-                    // TODO: Allow splitting
-                    let mut i = 0;
-                    while i < buf.len() && i < datagram.data.len() {
-                        buf[i] = datagram.data[i];
-                        i += 1;
-                    }
-
-                    return Ok(i);
-                }
-            }
-        }
-    }
-
-    fn write(&mut self, buf: &[u8]) -> Result<usize> {
-        let mut udp = Udp {
-            header: UdpHeader {
-                src: n16::new(self.host_port),
-                dst: n16::new(self.peer_port),
-                len: n16::new((mem::size_of::<UdpHeader>() + buf.len()) as u16),
-                checksum: Checksum { data: 0 },
-            },
-            data: Vec::from(buf),
-        };
-
-        unsafe {
-            let proto = n16::new(0x11);
-            let datagram_len = n16::new((mem::size_of::<UdpHeader>() + udp.data.len()) as u16);
-            udp.header.checksum.data =
-                Checksum::compile(Checksum::sum((&self.host_addr as *const Ipv4Addr) as usize,
-                                                mem::size_of::<Ipv4Addr>()) +
-                                  Checksum::sum((&self.peer_addr as *const Ipv4Addr) as usize,
-                                                mem::size_of::<Ipv4Addr>()) +
-                                  Checksum::sum((&proto as *const n16) as usize,
-                                                mem::size_of::<n16>()) +
-                                  Checksum::sum((&datagram_len as *const n16) as usize,
-                                                mem::size_of::<n16>()) +
-                                  Checksum::sum((&udp.header as *const UdpHeader) as usize,
-                                                mem::size_of::<UdpHeader>()) +
-                                  Checksum::sum(udp.data.as_ptr() as usize, udp.data.len()));
-        }
-
-        syscall::write(self.ip, &udp.to_bytes()).and(Ok(buf.len()))
-    }
-
-    fn sync(&mut self) -> Result<usize> {
-        syscall::fsync(self.ip)
-    }
-}

schemes/udpd/src/scheme.rs

@@ -1,73 +0,0 @@
-use std::rand;
-use std::{str, u16};
-
-use netutils::{getcfg, Ipv4Addr, Udp};
-use resource_scheme::ResourceScheme;
-use syscall;
-use syscall::error::{Error, Result, ENOENT, EINVAL};
-use syscall::flag::O_RDWR;
-
-use resource::UdpResource;
-
-/// UDP UdpScheme
-pub struct UdpScheme;
-
-impl ResourceScheme<UdpResource> for UdpScheme {
-    fn open_resource(&self, url: &[u8], _flags: usize, _uid: u32, _gid: u32) -> Result<Box<UdpResource>> {
-        let ip_addr = Ipv4Addr::from_str(&getcfg("ip").map_err(|err| err.into_sys())?);
-
-        let path = try!(str::from_utf8(url).or(Err(Error::new(EINVAL))));
-        let mut parts = path.split('/');
-        let remote = parts.next().unwrap_or("");
-        let path = parts.next().unwrap_or("");
-
-        // Check host and port vs path
-        if remote.is_empty() {
-            let host_port = path.parse::<u16>().unwrap_or(0);
-            if host_port > 0 {
-                while let Ok(ip) = syscall::open("ip:/11", O_RDWR) {
-                    let mut bytes = [0; 65536];
-                    if let Ok(count) = syscall::read(ip, &mut bytes) {
-                        if let Some(datagram) = Udp::from_bytes(&bytes[..count]) {
-                            if datagram.header.dst.get() == host_port {
-                                let mut path = [0; 256];
-                                if let Ok(path_count) = syscall::fpath(ip, &mut path) {
-                                    let ip_reference = unsafe { str::from_utf8_unchecked(&path[.. path_count]) }.split(':').nth(1).unwrap_or("");
-                                    let peer_addr = ip_reference.split('/').next().unwrap_or("").split(':').next().unwrap_or("");
-
-                                    return Ok(Box::new(UdpResource {
-                                        ip: ip,
-                                        data: datagram.data,
-                                        host_addr: ip_addr,
-                                        peer_addr: Ipv4Addr::from_str(peer_addr),
-                                        peer_port: datagram.header.src.get(),
-                                        host_port: host_port,
-                                    }));
-                                }
-                            }
-                        }
-                    }
-                }
-            }
-        } else {
-            let mut remote_parts = remote.split(':');
-            let peer_addr = remote_parts.next().unwrap_or("");
-            let peer_port = remote_parts.next().unwrap_or("").parse::<u16>().unwrap_or(0);
-            if peer_port > 0 {
-                let host_port = path.parse::<u16>().unwrap_or((rand() % 32768 + 32768) as u16);
-                if let Ok(ip) = syscall::open(&format!("ip:{}/11", peer_addr), O_RDWR) {
-                    return Ok(Box::new(UdpResource {
-                        ip: ip,
-                        data: Vec::new(),
-                        host_addr: ip_addr,
-                        peer_addr: Ipv4Addr::from_str(peer_addr),
-                        peer_port: peer_port as u16,
-                        host_port: host_port,
-                    }));
-                }
-            }
-        }
-
-        Err(Error::new(ENOENT))
-    }
-}

syscall/src/lib.rs

@@ -48,8 +48,8 @@ pub fn clock_gettime(clock: usize, tp: &mut TimeSpec) -> Result<usize> {
     unsafe { syscall2(SYS_CLOCK_GETTIME, clock, tp as *mut TimeSpec as usize) }
 }
 
-pub fn dup(fd: usize) -> Result<usize> {
+pub fn dup(fd: usize, buf: &[u8]) -> Result<usize> {
-    unsafe { syscall1(SYS_DUP, fd) }
+    unsafe { syscall3(SYS_DUP, fd, buf.as_ptr() as usize, buf.len()) }
 }
 
 pub fn execve(path: &str, args: &[[usize; 2]]) -> Result<usize> {

syscall/src/scheme.rs

@@ -10,7 +10,7 @@ pub trait Scheme {
             SYS_RMDIR => self.rmdir(unsafe { slice::from_raw_parts(packet.b as *const u8, packet.c) }, packet.uid, packet.gid),
             SYS_UNLINK => self.unlink(unsafe { slice::from_raw_parts(packet.b as *const u8, packet.c) }, packet.uid, packet.gid),
 
-            SYS_DUP => self.dup(packet.b),
+            SYS_DUP => self.dup(packet.b, unsafe { slice::from_raw_parts(packet.c as *const u8, packet.d) }),
             SYS_READ => self.read(packet.b, unsafe { slice::from_raw_parts_mut(packet.c as *mut u8, packet.d) }),
             SYS_WRITE => self.write(packet.b, unsafe { slice::from_raw_parts(packet.c as *const u8, packet.d) }),
             SYS_LSEEK => self.seek(packet.b, packet.c, packet.d),
@@ -49,7 +49,7 @@ pub trait Scheme {
 
     /* Resource operations */
     #[allow(unused_variables)]
-    fn dup(&self, old_id: usize) -> Result<usize> {
+    fn dup(&self, old_id: usize, buf: &[u8]) -> Result<usize> {
         Err(Error::new(EBADF))
     }
 
@@ -107,7 +107,7 @@ pub trait SchemeMut {
             SYS_RMDIR => self.rmdir(unsafe { slice::from_raw_parts(packet.b as *const u8, packet.c) }, packet.uid, packet.gid),
             SYS_UNLINK => self.unlink(unsafe { slice::from_raw_parts(packet.b as *const u8, packet.c) }, packet.uid, packet.gid),
 
-            SYS_DUP => self.dup(packet.b),
+            SYS_DUP => self.dup(packet.b, unsafe { slice::from_raw_parts_mut(packet.c as *mut u8, packet.d) }),
             SYS_READ => self.read(packet.b, unsafe { slice::from_raw_parts_mut(packet.c as *mut u8, packet.d) }),
             SYS_WRITE => self.write(packet.b, unsafe { slice::from_raw_parts(packet.c as *const u8, packet.d) }),
             SYS_LSEEK => self.seek(packet.b, packet.c, packet.d),
@@ -145,7 +145,7 @@ pub trait SchemeMut {
 
     /* Resource operations */
     #[allow(unused_variables)]
-    fn dup(&mut self, old_id: usize) -> Result<usize> {
+    fn dup(&mut self, old_id: usize, buf: &[u8]) -> Result<usize> {
         Err(Error::new(EBADF))
     }