Add random number scheme, update userutils to use it

Makefile

@@ -401,6 +401,7 @@ userutils: \
 	filesystem/bin/getty \
 	filesystem/bin/id \
 	filesystem/bin/login \
+	filesystem/bin/passwd \
 	filesystem/bin/su \
 	filesystem/bin/sudo
 
@@ -410,6 +411,7 @@ schemes: \
 	filesystem/bin/example \
 	filesystem/bin/ipd \
 	filesystem/bin/orbital \
+	filesystem/bin/randd \
 	filesystem/bin/tcpd \
 	filesystem/bin/udpd
 

filesystem/etc/init.rc

@@ -1,3 +1,4 @@
+randd
 initfs:bin/pcid /etc/pcid.toml
 ethernetd
 arpd

filesystem/etc/passwd

@@ -1,2 +1,2 @@
-root;F3C2DB8A2B386A467FE3BA116DD2D2E3EAAE98546FCC8321FDBD4C1F6D65A2;0;0;root;file:root;file:bin/ion
+root;$argon2i$m=4096,t=10,p=1$Tnc4UVV0N00$ML9LIOujd3nmAfkAwEcSTMPqakWUF0OUiLWrIy0nGLk;0;0;root;file:root;file:bin/ion
 user;;1000;1000;user;file:home/user;file:bin/ion

filesystem/etc/pcid.toml

@@ -3,11 +3,11 @@ name = "E1000 NIC"
 class = 2
 vendor = 32902
 device = 4110
-command = ["file:bin/e1000d", "$BAR0", "$IRQ"]
+command = ["e1000d", "$BAR0", "$IRQ"]
 
 [[drivers]]
 name = "RTL8168 NIC"
 class = 2
 vendor = 4332
 device = 33128
-command = ["file:bin/rtl8168d", "$BAR2", "$IRQ"]
+command = ["rtl8168d", "$BAR2", "$IRQ"]

libstd

@@ -1 +1 @@
-Subproject commit 00d7f8a547b83e604f1a3b6df769a6e77e7feed9
+Subproject commit 4f642eed87af22913af7bef9c71910ee1765445e

programs/orbutils

@@ -1 +1 @@
-Subproject commit edc8da6807a18bc2ae7c4482ae4a84ca9dad4f4a
+Subproject commit 517ca6d125e90d6b30e45a759f54b1d1b3b346d4

programs/userutils

@@ -1 +1 @@
-Subproject commit e0fe388ccfe8873cc6e42dc99556bccc191528fb
+Subproject commit 46631df4f09c39ff760b48d25249a48840ee20fa

schemes/randd/Cargo.toml

@@ -0,0 +1,3 @@
+[package]
+name = "randd"
+version = "0.1.0"

schemes/randd/src/main.rs

@@ -0,0 +1,59 @@
+#![feature(asm)]
+
+extern crate syscall;
+
+use std::fs::File;
+use std::io::{Read, Write};
+use std::thread;
+
+use syscall::{Packet, Result, Scheme};
+
+//TODO: Use a CSPRNG, allow write of entropy
+struct RandScheme;
+
+impl Scheme for RandScheme {
+    fn open(&self, _path: &[u8], _flags: usize, _uid: u32, _gid: u32) -> Result<usize> {
+        Ok(0)
+    }
+
+    fn dup(&self, file: usize) -> Result<usize> {
+        Ok(file)
+    }
+
+    fn read(&self, _file: usize, buf: &mut [u8]) -> Result<usize> {
+        let mut i = 0;
+        for chunk in buf.chunks_mut(8) {
+            let mut rand: u64;
+            unsafe {
+                asm!("rdrand rax"
+                    : "={rax}"(rand)
+                    :
+                    :
+                    : "intel", "volatile");
+            }
+            for b in chunk.iter_mut() {
+                *b = rand as u8;
+                rand = rand >> 8;
+                i += 1;
+            }
+        }
+        Ok(i)
+    }
+
+    fn close(&self, _file: usize) -> Result<usize> {
+        Ok(0)
+    }
+}
+
+fn main(){
+    thread::spawn(move || {
+        let mut socket = File::create(":rand").expect("rand: failed to create rand scheme");
+        let scheme = RandScheme;
+        loop {
+            let mut packet = Packet::default();
+            socket.read(&mut packet).expect("rand: failed to read events from rand scheme");
+            scheme.handle(&mut packet);
+            socket.write(&packet).expect("rand: failed to write responses to rand scheme");
+        }
+    });
+}