832 lines
33 KiB
Rust
832 lines
33 KiB
Rust
extern crate event;
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extern crate netutils;
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extern crate rand;
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extern crate syscall;
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use rand::{Rng, OsRng};
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use std::collections::{BTreeMap, VecDeque};
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use std::cell::RefCell;
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use std::fs::File;
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use std::io::{self, Read, Write};
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use std::{mem, process, slice, str};
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use std::ops::{Deref, DerefMut};
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use std::os::unix::io::FromRawFd;
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use std::rc::Rc;
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use event::EventQueue;
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use netutils::{n16, n32, Ipv4, Ipv4Addr, Ipv4Header, Tcp, TcpHeader, Checksum, TCP_FIN, TCP_SYN, TCP_RST, TCP_PSH, TCP_ACK};
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use syscall::data::{Packet, TimeSpec};
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use syscall::error::{Error, Result, EACCES, EADDRINUSE, EBADF, EIO, EINVAL, EISCONN, EMSGSIZE, ENOTCONN, EWOULDBLOCK};
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use syscall::flag::{EVENT_READ, F_GETFL, F_SETFL, O_ACCMODE, O_CREAT, O_RDWR, O_NONBLOCK};
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use syscall::scheme::SchemeMut;
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fn parse_socket(socket: &str) -> (Ipv4Addr, u16) {
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let mut socket_parts = socket.split(":");
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let host = Ipv4Addr::from_str(socket_parts.next().unwrap_or(""));
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let port = socket_parts.next().unwrap_or("").parse::<u16>().unwrap_or(0);
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(host, port)
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}
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#[derive(Copy, Clone, Debug, Eq, PartialEq)]
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enum State {
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Listen,
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SynSent,
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SynReceived,
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Established,
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FinWait1,
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FinWait2,
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CloseWait,
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Closing,
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LastAck,
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TimeWait,
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Closed
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}
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struct TcpHandle {
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local: (Ipv4Addr, u16),
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remote: (Ipv4Addr, u16),
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flags: usize,
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events: usize,
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read_timeout: Option<TimeSpec>,
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write_timeout: Option<TimeSpec>,
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ttl: u8,
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state: State,
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seq: u32,
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ack: u32,
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data: VecDeque<(Ipv4, Tcp)>,
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todo_dup: VecDeque<Packet>,
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todo_read: VecDeque<Packet>,
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todo_write: VecDeque<Packet>,
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}
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impl TcpHandle {
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fn is_connected(&self) -> bool {
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self.remote.0 != Ipv4Addr::NULL && self.remote.1 != 0
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}
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fn read_closed(&self) -> bool {
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self.state == State::CloseWait || self.state == State::LastAck || self.state == State::TimeWait || self.state == State::Closed
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}
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fn matches(&self, ip: &Ipv4, tcp: &Tcp) -> bool {
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// Local address not set or IP dst matches or is broadcast
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(self.local.0 == Ipv4Addr::NULL || ip.header.dst == self.local.0 || ip.header.dst == Ipv4Addr::BROADCAST)
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// Local port matches UDP dst
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&& tcp.header.dst.get() == self.local.1
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// Remote address not set or is broadcast, or IP src matches
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&& (self.remote.0 == Ipv4Addr::NULL || self.remote.0 == Ipv4Addr::BROADCAST || ip.header.src == self.remote.0)
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// Remote port not set or UDP src matches
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&& (self.remote.1 == 0 || tcp.header.src.get() == self.remote.1)
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}
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fn create_tcp(&self, flags: u16, data: Vec<u8>) -> Tcp {
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Tcp {
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header: TcpHeader {
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src: n16::new(self.local.1),
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dst: n16::new(self.remote.1),
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sequence: n32::new(self.seq),
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ack_num: n32::new(self.ack),
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flags: n16::new(((mem::size_of::<TcpHeader>() << 10) & 0xF000) as u16 | (flags & 0xFFF)),
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window_size: n16::new(8192),
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checksum: Checksum { data: 0 },
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urgent_pointer: n16::new(0),
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},
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options: Vec::new(),
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data: data
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}
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}
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fn create_ip(&self, id: u16, data: Vec<u8>) -> Ipv4 {
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Ipv4 {
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header: Ipv4Header {
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ver_hlen: 0x45,
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services: 0,
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len: n16::new((data.len() + mem::size_of::<Ipv4Header>()) as u16),
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id: n16::new(id),
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flags_fragment: n16::new(0),
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ttl: self.ttl,
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proto: 0x06,
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checksum: Checksum { data: 0 },
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src: self.local.0,
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dst: self.remote.0
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},
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options: Vec::new(),
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data: data
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}
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}
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}
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#[derive(Copy, Clone)]
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enum SettingKind {
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Ttl,
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ReadTimeout,
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WriteTimeout
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}
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enum Handle {
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Tcp(TcpHandle),
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Setting(usize, SettingKind),
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}
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struct Tcpd {
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scheme_file: File,
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tcp_file: File,
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ports: BTreeMap<u16, usize>,
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next_id: usize,
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handles: BTreeMap<usize, Handle>,
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rng: OsRng,
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}
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impl Tcpd {
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fn new(scheme_file: File, tcp_file: File) -> Self {
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Tcpd {
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scheme_file: scheme_file,
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tcp_file: tcp_file,
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ports: BTreeMap::new(),
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next_id: 1,
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handles: BTreeMap::new(),
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rng: OsRng::new().expect("tcpd: failed to open RNG")
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}
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}
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fn scheme_event(&mut self) -> io::Result<()> {
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loop {
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let mut packet = Packet::default();
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if self.scheme_file.read(&mut packet)? == 0 {
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break;
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}
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let a = packet.a;
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self.handle(&mut packet);
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if packet.a == (-EWOULDBLOCK) as usize {
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if let Some(mut handle) = self.handles.get_mut(&packet.b) {
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if let Handle::Tcp(ref mut handle) = *handle {
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match a {
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syscall::number::SYS_DUP => {
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packet.a = a;
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handle.todo_dup.push_back(packet);
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},
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syscall::number::SYS_READ => {
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packet.a = a;
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handle.todo_read.push_back(packet);
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},
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syscall::number::SYS_WRITE => {
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packet.a = a;
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handle.todo_write.push_back(packet);
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},
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_ => {
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self.scheme_file.write(&packet)?;
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}
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}
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}
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}
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} else {
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self.scheme_file.write(&packet)?;
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}
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}
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Ok(())
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}
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fn tcp_event(&mut self) -> io::Result<()> {
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loop {
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let mut bytes = [0; 65536];
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let count = self.tcp_file.read(&mut bytes)?;
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if count == 0 {
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break;
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}
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if let Some(ip) = Ipv4::from_bytes(&bytes[.. count]) {
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if let Some(tcp) = Tcp::from_bytes(&ip.data) {
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let mut closing = Vec::new();
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let mut found_connection = false;
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for (id, handle) in self.handles.iter_mut() {
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if let Handle::Tcp(ref mut handle) = *handle {
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if handle.state != State::Listen && handle.matches(&ip, &tcp) {
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found_connection = true;
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match handle.state {
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State::SynReceived => if tcp.header.flags.get() & (TCP_SYN | TCP_ACK) == TCP_ACK && tcp.header.ack_num.get() == handle.seq {
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handle.state = State::Established;
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},
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State::SynSent => if tcp.header.flags.get() & (TCP_SYN | TCP_ACK) == TCP_SYN | TCP_ACK && tcp.header.ack_num.get() == handle.seq {
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handle.state = State::Established;
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handle.ack = tcp.header.sequence.get() + 1;
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let tcp = handle.create_tcp(TCP_ACK, Vec::new());
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let ip = handle.create_ip(self.rng.gen(), tcp.to_bytes());
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self.tcp_file.write(&ip.to_bytes())?;
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},
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State::Established => if tcp.header.flags.get() & (TCP_SYN | TCP_ACK) == TCP_ACK && tcp.header.ack_num.get() == handle.seq {
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handle.ack = tcp.header.sequence.get();
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if ! tcp.data.is_empty() {
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handle.data.push_back((ip.clone(), tcp.clone()));
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handle.ack += tcp.data.len() as u32;
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let tcp = handle.create_tcp(TCP_ACK, Vec::new());
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let ip = handle.create_ip(self.rng.gen(), tcp.to_bytes());
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self.tcp_file.write(&ip.to_bytes())?;
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} else if tcp.header.flags.get() & TCP_FIN == TCP_FIN {
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handle.state = State::CloseWait;
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handle.ack += 1;
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let tcp = handle.create_tcp(TCP_ACK, Vec::new());
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let ip = handle.create_ip(self.rng.gen(), tcp.to_bytes());
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self.tcp_file.write(&ip.to_bytes())?;
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}
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},
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//TODO: Time wait
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State::FinWait1 => if tcp.header.flags.get() & (TCP_SYN | TCP_ACK) == TCP_ACK && tcp.header.ack_num.get() == handle.seq {
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handle.ack = tcp.header.sequence.get() + 1;
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if tcp.header.flags.get() & TCP_FIN == TCP_FIN {
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handle.state = State::TimeWait;
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let tcp = handle.create_tcp(TCP_ACK, Vec::new());
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let ip = handle.create_ip(self.rng.gen(), tcp.to_bytes());
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self.tcp_file.write(&ip.to_bytes())?;
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closing.push(*id);
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} else {
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handle.state = State::FinWait2;
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}
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},
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State::FinWait2 => if tcp.header.flags.get() & (TCP_SYN | TCP_ACK | TCP_FIN) == TCP_ACK | TCP_FIN && tcp.header.ack_num.get() == handle.seq {
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handle.ack = tcp.header.sequence.get() + 1;
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handle.state = State::TimeWait;
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let tcp = handle.create_tcp(TCP_ACK, Vec::new());
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let ip = handle.create_ip(self.rng.gen(), tcp.to_bytes());
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self.tcp_file.write(&ip.to_bytes())?;
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closing.push(*id);
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},
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State::LastAck => if tcp.header.flags.get() & (TCP_SYN | TCP_ACK) == TCP_ACK && tcp.header.ack_num.get() == handle.seq {
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handle.state = State::Closed;
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closing.push(*id);
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},
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_ => ()
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}
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while ! handle.todo_read.is_empty() && (! handle.data.is_empty() || handle.read_closed()) {
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let mut packet = handle.todo_read.pop_front().unwrap();
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let buf = unsafe { slice::from_raw_parts_mut(packet.c as *mut u8, packet.d) };
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if let Some((_ip, tcp)) = handle.data.pop_front() {
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let mut i = 0;
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while i < buf.len() && i < tcp.data.len() {
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buf[i] = tcp.data[i];
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i += 1;
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}
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packet.a = i;
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} else {
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packet.a = 0;
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}
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self.scheme_file.write(&packet)?;
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}
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if ! handle.todo_write.is_empty() && handle.state == State::Established {
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let mut packet = handle.todo_write.pop_front().unwrap();
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let buf = unsafe { slice::from_raw_parts(packet.c as *const u8, packet.d) };
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let tcp = handle.create_tcp(TCP_ACK | TCP_PSH, buf.to_vec());
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let ip = handle.create_ip(self.rng.gen(), tcp.to_bytes());
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let result = self.tcp_file.write(&ip.to_bytes()).map_err(|err| Error::new(err.raw_os_error().unwrap_or(EIO)));
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if result.is_ok() {
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handle.seq += buf.len() as u32;
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}
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packet.a = Error::mux(result.and(Ok(buf.len())));
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self.scheme_file.write(&packet)?;
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}
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if handle.events & EVENT_READ == EVENT_READ {
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if let Some(&(ref _ip, ref tcp)) = handle.data.get(0) {
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self.scheme_file.write(&Packet {
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id: 0,
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pid: 0,
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uid: 0,
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gid: 0,
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a: syscall::number::SYS_FEVENT,
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b: *id,
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c: EVENT_READ,
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d: tcp.data.len()
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})?;
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}
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}
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}
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}
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}
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for file in closing {
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if let Handle::Tcp(handle) = self.handles.remove(&file).unwrap() {
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let remove = if let Some(mut port) = self.ports.get_mut(&handle.local.1) {
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*port = *port + 1;
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*port == 0
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} else {
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false
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};
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if remove {
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self.ports.remove(&handle.local.1);
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}
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}
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}
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if ! found_connection && tcp.header.flags.get() & (TCP_SYN | TCP_ACK) == TCP_SYN {
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let mut new_handles = Vec::new();
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for (_id, handle) in self.handles.iter_mut() {
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if let Handle::Tcp(ref mut handle) = *handle {
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if handle.state == State::Listen && handle.matches(&ip, &tcp) {
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handle.data.push_back((ip.clone(), tcp.clone()));
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while ! handle.todo_dup.is_empty() && ! handle.data.is_empty() {
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let mut packet = handle.todo_dup.pop_front().unwrap();
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let (ip, tcp) = handle.data.pop_front().unwrap();
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let mut new_handle = TcpHandle {
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local: handle.local,
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remote: (ip.header.src, tcp.header.src.get()),
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flags: handle.flags,
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events: 0,
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read_timeout: handle.read_timeout,
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write_timeout: handle.write_timeout,
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ttl: handle.ttl,
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state: State::SynReceived,
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seq: self.rng.gen(),
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ack: tcp.header.sequence.get() + 1,
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data: VecDeque::new(),
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todo_dup: VecDeque::new(),
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todo_read: VecDeque::new(),
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todo_write: VecDeque::new(),
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};
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let tcp = new_handle.create_tcp(TCP_SYN | TCP_ACK, Vec::new());
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let ip = new_handle.create_ip(self.rng.gen(), tcp.to_bytes());
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self.tcp_file.write(&ip.to_bytes())?;
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new_handle.seq += 1;
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handle.data.retain(|&(ref ip, ref tcp)| {
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if new_handle.matches(ip, tcp) {
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false
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} else {
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true
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}
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});
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if let Some(mut port) = self.ports.get_mut(&handle.local.1) {
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*port = *port + 1;
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}
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let id = self.next_id;
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self.next_id += 1;
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packet.a = id;
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new_handles.push((packet, Handle::Tcp(new_handle)));
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}
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}
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}
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}
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for (packet, new_handle) in new_handles {
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self.handles.insert(packet.a, new_handle);
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self.scheme_file.write(&packet)?;
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}
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}
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}
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}
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}
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Ok(())
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}
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}
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impl SchemeMut for Tcpd {
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fn open(&mut self, url: &[u8], flags: usize, uid: u32, _gid: u32) -> Result<usize> {
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let path = str::from_utf8(url).or(Err(Error::new(EINVAL)))?;
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let mut parts = path.split("/");
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let remote = parse_socket(parts.next().unwrap_or(""));
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let mut local = parse_socket(parts.next().unwrap_or(""));
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if local.1 == 0 {
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local.1 = self.rng.gen_range(32768, 65535);
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}
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if local.1 <= 1024 && uid != 0 {
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return Err(Error::new(EACCES));
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}
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if self.ports.contains_key(&local.1) {
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return Err(Error::new(EADDRINUSE));
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}
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let mut handle = TcpHandle {
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local: local,
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remote: remote,
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flags: flags,
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events: 0,
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read_timeout: None,
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write_timeout: None,
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ttl: 64,
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state: State::Listen,
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seq: 0,
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ack: 0,
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data: VecDeque::new(),
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todo_dup: VecDeque::new(),
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todo_read: VecDeque::new(),
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todo_write: VecDeque::new(),
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};
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if handle.is_connected() {
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handle.seq = self.rng.gen();
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handle.ack = 0;
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handle.state = State::SynSent;
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let tcp = handle.create_tcp(TCP_SYN, Vec::new());
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let ip = handle.create_ip(self.rng.gen(), tcp.to_bytes());
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self.tcp_file.write(&ip.to_bytes()).map_err(|err| Error::new(err.raw_os_error().unwrap_or(EIO)))?;
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handle.seq += 1;
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}
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self.ports.insert(local.1, 1);
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let id = self.next_id;
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self.next_id += 1;
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self.handles.insert(id, Handle::Tcp(handle));
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Ok(id)
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}
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fn dup(&mut self, file: usize, buf: &[u8]) -> Result<usize> {
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let handle = match *self.handles.get_mut(&file).ok_or(Error::new(EBADF))? {
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Handle::Tcp(ref mut handle) => {
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let mut new_handle = TcpHandle {
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local: handle.local,
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remote: handle.remote,
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flags: handle.flags,
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events: 0,
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read_timeout: handle.read_timeout,
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write_timeout: handle.write_timeout,
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ttl: handle.ttl,
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state: handle.state,
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seq: handle.seq,
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ack: handle.ack,
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data: VecDeque::new(),
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todo_dup: VecDeque::new(),
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todo_read: VecDeque::new(),
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todo_write: VecDeque::new(),
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};
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let path = str::from_utf8(buf).or(Err(Error::new(EINVAL)))?;
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if path == "ttl" {
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Handle::Setting(file, SettingKind::Ttl)
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} else if path == "read_timeout" {
|
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Handle::Setting(file, SettingKind::ReadTimeout)
|
|
} else if path == "write_timeout" {
|
|
Handle::Setting(file, SettingKind::WriteTimeout)
|
|
} else 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| Error::new(err.raw_os_error().unwrap_or(EIO))).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
|
|
}
|
|
});
|
|
|
|
Handle::Tcp(new_handle)
|
|
} else if path.is_empty() {
|
|
new_handle.data = handle.data.clone();
|
|
|
|
Handle::Tcp(new_handle)
|
|
} 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| Error::new(err.raw_os_error().unwrap_or(EIO))).and(Ok(buf.len()))?;
|
|
|
|
Handle::Tcp(new_handle)
|
|
} else {
|
|
return Err(Error::new(EINVAL));
|
|
}
|
|
}
|
|
},
|
|
Handle::Setting(file, kind) => {
|
|
Handle::Setting(file, kind)
|
|
}
|
|
};
|
|
|
|
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 (file, kind) = match *self.handles.get_mut(&file).ok_or(Error::new(EBADF))? {
|
|
Handle::Tcp(ref mut handle) => {
|
|
if ! handle.is_connected() {
|
|
return 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;
|
|
}
|
|
|
|
return Ok(i);
|
|
} else if handle.flags & O_NONBLOCK == O_NONBLOCK || handle.read_closed() {
|
|
return Ok(0);
|
|
} else {
|
|
return Err(Error::new(EWOULDBLOCK));
|
|
}
|
|
},
|
|
Handle::Setting(file, kind) => {
|
|
(file, kind)
|
|
}
|
|
};
|
|
|
|
if let Handle::Tcp(ref mut handle) = *self.handles.get_mut(&file).ok_or(Error::new(EBADF))? {
|
|
let read_timeout = |timeout: &Option<TimeSpec>, buf: &mut [u8]| -> Result<usize> {
|
|
if let Some(ref timespec) = *timeout {
|
|
timespec.deref().read(buf).map_err(|err| Error::new(err.raw_os_error().unwrap_or(EIO)))
|
|
} else {
|
|
Ok(0)
|
|
}
|
|
};
|
|
|
|
match kind {
|
|
SettingKind::Ttl => {
|
|
if let Some(mut ttl) = buf.get_mut(0) {
|
|
*ttl = handle.ttl;
|
|
Ok(1)
|
|
} else {
|
|
Ok(0)
|
|
}
|
|
},
|
|
SettingKind::ReadTimeout => {
|
|
read_timeout(&handle.read_timeout, buf)
|
|
},
|
|
SettingKind::WriteTimeout => {
|
|
read_timeout(&handle.write_timeout, buf)
|
|
}
|
|
}
|
|
} else {
|
|
Err(Error::new(EBADF))
|
|
}
|
|
}
|
|
|
|
fn write(&mut self, file: usize, buf: &[u8]) -> Result<usize> {
|
|
let (file, kind) = match *self.handles.get_mut(&file).ok_or(Error::new(EBADF))? {
|
|
Handle::Tcp(ref mut handle) => {
|
|
if ! handle.is_connected() {
|
|
return Err(Error::new(ENOTCONN));
|
|
} else if buf.len() >= 65507 {
|
|
return 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| Error::new(err.raw_os_error().unwrap_or(EIO)))?;
|
|
handle.seq += buf.len() as u32;
|
|
return Ok(buf.len());
|
|
},
|
|
_ => {
|
|
return Err(Error::new(EWOULDBLOCK));
|
|
}
|
|
}
|
|
}
|
|
},
|
|
Handle::Setting(file, kind) => {
|
|
(file, kind)
|
|
}
|
|
};
|
|
|
|
if let Handle::Tcp(ref mut handle) = *self.handles.get_mut(&file).ok_or(Error::new(EBADF))? {
|
|
let write_timeout = |timeout: &mut Option<TimeSpec>, buf: &[u8]| -> Result<usize> {
|
|
if buf.len() >= mem::size_of::<TimeSpec>() {
|
|
let mut timespec = TimeSpec::default();
|
|
let count = timespec.deref_mut().write(buf).map_err(|err| Error::new(err.raw_os_error().unwrap_or(EIO)))?;
|
|
*timeout = Some(timespec);
|
|
Ok(count)
|
|
} else {
|
|
*timeout = None;
|
|
Ok(0)
|
|
}
|
|
};
|
|
|
|
match kind {
|
|
SettingKind::Ttl => {
|
|
if let Some(ttl) = buf.get(0) {
|
|
handle.ttl = *ttl;
|
|
Ok(1)
|
|
} else {
|
|
Ok(0)
|
|
}
|
|
},
|
|
SettingKind::ReadTimeout => {
|
|
write_timeout(&mut handle.read_timeout, buf)
|
|
},
|
|
SettingKind::WriteTimeout => {
|
|
write_timeout(&mut handle.write_timeout, buf)
|
|
}
|
|
}
|
|
} else {
|
|
Err(Error::new(EBADF))
|
|
}
|
|
}
|
|
|
|
fn fcntl(&mut self, file: usize, cmd: usize, arg: usize) -> Result<usize> {
|
|
if let Handle::Tcp(ref mut handle) = *self.handles.get_mut(&file).ok_or(Error::new(EBADF))? {
|
|
match cmd {
|
|
F_GETFL => Ok(handle.flags),
|
|
F_SETFL => {
|
|
handle.flags = arg & ! O_ACCMODE;
|
|
Ok(0)
|
|
},
|
|
_ => Err(Error::new(EINVAL))
|
|
}
|
|
} else {
|
|
Err(Error::new(EBADF))
|
|
}
|
|
}
|
|
|
|
fn fevent(&mut self, file: usize, flags: usize) -> Result<usize> {
|
|
if let Handle::Tcp(ref mut handle) = *self.handles.get_mut(&file).ok_or(Error::new(EBADF))? {
|
|
handle.events = flags;
|
|
Ok(file)
|
|
} else {
|
|
Err(Error::new(EBADF))
|
|
}
|
|
}
|
|
|
|
fn fpath(&mut self, file: usize, buf: &mut [u8]) -> Result<usize> {
|
|
if let Handle::Tcp(ref mut handle) = *self.handles.get_mut(&file).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)
|
|
} else {
|
|
Err(Error::new(EBADF))
|
|
}
|
|
}
|
|
|
|
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 = {
|
|
if let Handle::Tcp(ref mut handle) = *self.handles.get_mut(&file).ok_or(Error::new(EBADF))? {
|
|
handle.data.clear();
|
|
|
|
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| Error::new(err.raw_os_error().unwrap_or(EIO)))?;
|
|
|
|
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| Error::new(err.raw_os_error().unwrap_or(EIO)))?;
|
|
|
|
handle.seq += 1;
|
|
|
|
false
|
|
},
|
|
_ => true
|
|
}
|
|
} else {
|
|
true
|
|
}
|
|
};
|
|
|
|
if closed {
|
|
if let Handle::Tcp(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 daemon(tcp_fd: usize, scheme_fd: usize) {
|
|
let tcp_file = unsafe { File::from_raw_fd(tcp_fd) };
|
|
let scheme_file = unsafe { File::from_raw_fd(scheme_fd) };
|
|
|
|
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");
|
|
}
|
|
|
|
fn main() {
|
|
match syscall::open("ip:6", O_RDWR | O_NONBLOCK) {
|
|
Ok(tcp_fd) => {
|
|
// Daemonize
|
|
if unsafe { syscall::clone(0).unwrap() } == 0 {
|
|
match syscall::open(":tcp", O_RDWR | O_CREAT | O_NONBLOCK) {
|
|
Ok(scheme_fd) => {
|
|
daemon(tcp_fd, scheme_fd);
|
|
},
|
|
Err(err) => {
|
|
println!("tcpd: failed to create tcp scheme: {}", err);
|
|
process::exit(1);
|
|
}
|
|
}
|
|
}
|
|
},
|
|
Err(err) => {
|
|
println!("tcpd: failed to open ip:6: {}", err);
|
|
process::exit(1);
|
|
}
|
|
}
|
|
}
|