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#![feature(libc)]
extern crate libc;
extern crate rustc_serialize;
extern crate rand;
extern crate eui48;
use libc::{c_char};
use std::path::Path;
use std::fs::File;
use std::io::prelude::*;
use std::io::BufReader;
use std::ops::Add;
use std::time::{SystemTime, Duration, UNIX_EPOCH};
use std::ffi::CStr;
use rand::{OsRng, Rng};
use rustc_serialize::hex::FromHex;
use eui48::{MacAddress, Eui48};
#[no_mangle]
pub extern fn uuid_gen_new(ptr: *const c_char) -> *mut UUIDGen {
let eui_cstr = unsafe {
assert!(!ptr.is_null());
CStr::from_ptr(ptr)
};
let mut eui: [u8; 6] = Default::default();
eui.copy_from_slice(&eui_cstr.to_bytes()[0..6]);
Box::into_raw(Box::new(UUIDGen::new(eui)))
}
#[no_mangle]
pub extern fn uuid_gen_free(ptr: *mut UUIDGen) {
if ptr.is_null() { return }
unsafe {
Box::from_raw(ptr);
}
}
#[no_mangle]
pub extern fn uuid_gen_nonce64(gen_ptr: *mut UUIDGen, nonce_ptr: *mut u8) {
let gen = unsafe {
assert!(!gen_ptr.is_null());
&mut *gen_ptr
};
let nonce64: [u8; 8] = gen.nonce64();
let nonce64: &[u8] = &nonce64[0..8];
unsafe { std::ptr::copy(&(nonce64)[0], nonce_ptr, 8) }
}
#[no_mangle]
pub extern fn uuid_gen_uuid128(gen_ptr: *mut UUIDGen, uuid_ptr: *mut u8) {
let gen = unsafe {
assert!(!gen_ptr.is_null());
&mut *gen_ptr
};
let uuid128: [u8; 16] = gen.uuid128();
let uuid128: &[u8] = &uuid128[0..16];
unsafe { std::ptr::copy(&(uuid128)[0], uuid_ptr, 16) }
}
#[derive(Debug)]
pub struct UUIDGen(MacAddress);
impl UUIDGen {
pub fn new(eui: Eui48) -> UUIDGen {
UUIDGen(MacAddress::new(eui))
}
pub fn nonce64(&self) -> [u8; 8] {
let nanosec_bytes = nanosecs_since_epoch56();
let mut rng = OsRng::new()
.expect("Failed to initialise RNG.");
let r = rng.gen::<[u8; 1]>();
let mut bytes = [0; 8];
bytes[0] = nanosec_bytes[0];
bytes[1] = nanosec_bytes[1];
bytes[2] = nanosec_bytes[2];
bytes[3] = nanosec_bytes[3];
bytes[4] = nanosec_bytes[4];
bytes[5] = nanosec_bytes[5];
bytes[6] = nanosec_bytes[6];
bytes[7] = r[0];
bytes
}
pub fn uuid128(&self) -> [u8; 16] {
let nanosec_bytes = nanosecs_since_epoch();
let mut rng = OsRng::new()
.expect("Failed to initialise RNG.");
let r = rng.gen::<[u8; 2]>();
let mac_bytes = self.0.as_bytes();
let mut bytes = [0; 16];
bytes[0] = nanosec_bytes[0];
bytes[1] = nanosec_bytes[1];
bytes[2] = nanosec_bytes[2];
bytes[3] = nanosec_bytes[3];
bytes[4] = nanosec_bytes[4];
bytes[5] = nanosec_bytes[5];
bytes[6] = nanosec_bytes[6];
bytes[7] = nanosec_bytes[7];
bytes[8] = mac_bytes[0];
bytes[9] = mac_bytes[1];
bytes[10] = mac_bytes[2];
bytes[11] = mac_bytes[3];
bytes[12] = mac_bytes[4];
bytes[13] = mac_bytes[5];
bytes[14] = r[0];
bytes[15] = r[1];
bytes
}
}
fn epoch_min() -> SystemTime {
let secs_years_47: u64 = 60 * 60 * 24 * 365 * 47;
UNIX_EPOCH.add(Duration::new(secs_years_47, 0))
}
fn little_endian_inv56(x: u64) -> [u8; 7] {
let mut bytes: [u8; 7] = [0; 7];
bytes[0] = (x & 0xFF) as u8;
for i in 1..7 {
bytes[i] = ((x & (0xFF << i * 8)) >> i * 8) as u8;
}
bytes
}
fn little_endian_inv64(x: u64) -> [u8; 8] {
let mut bytes: [u8; 8] = [0; 8];
bytes[0] = (x & 0xFF) as u8;
for i in 1..8 {
bytes[i] = ((x & (0xFF << i * 8)) >> i * 8) as u8;
}
bytes
}
fn nanosecs_since_epoch56() -> [u8; 7] {
let now = SystemTime::now();
let duration = now.duration_since(epoch_min())
.expect("Failed to get duration since unix epoch.");
let secs: u64 = duration.as_secs() as u64 * 1_000_000_0;
let nanosecs: u64 = secs + (duration.subsec_nanos() / 1_00) as u64;
little_endian_inv56(nanosecs)
}
fn nanosecs_since_epoch() -> [u8; 8] {
let now = SystemTime::now();
let duration = now.duration_since(epoch_min())
.expect("Failed to get duration since unix epoch.");
let secs: u64 = duration.as_secs() as u64 * 1_000_000_0;
let nanosecs: u64 = secs + (duration.subsec_nanos() / 1_00) as u64;
little_endian_inv64(nanosecs)
}
pub fn read_interface_eui(iface: &str) -> Eui48 {
let path = Path::new("/sys/class/net").join(Path::new(iface)).join("address");
let f = File::open(path)
.expect("Network interface not found.");
let mut reader = BufReader::new(f);
let mut line = String::new();
reader.read_line(&mut line)
.expect("Unable to read iface.");
let mut eui: Eui48 = [0; 6];
for i in 0..6 {
let byte: String = line.drain(0..2).collect();
line.drain(0..1);
let byte_v = byte.from_hex()
.expect(format!("Failed to decode mac_address byte {}", i).as_str());
eui[i] = byte_v[0];
}
eui
}
#[cfg(test)]
mod tests {
use super::*;
use std::collections::HashMap;
use rustc_serialize::hex::ToHex;
#[test]
fn uuid_gen() {
let eui = read_interface_eui("new0");
let gen = UUIDGen::new(eui);
let mut entries = HashMap::new();
for i in 1..4_294_967_296 as u64 {
let key = gen.nonce64().to_hex();
if !entries.contains_key(&key) {
entries.insert(key, ());
} else {
println!("Found collision at {} where key = {}", i, key);
}
}
}
}