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network.rs
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156 lines (127 loc) · 3.83 KB
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use std::io;
use std::str;
use std::io::Cursor;
use std::convert::From;
use std::str::FromStr;
use std::net::{IpAddr, Ipv4Addr, Ipv6Addr, SocketAddr};
use regex::Regex;
use byteorder::{NetworkEndian, ReadBytesExt, WriteBytesExt};
macro_rules! slice2sized {
($bytes:expr, $l: expr) => (
{
let mut arr = [0u8; $l];
for i in 0..$bytes.len() {
arr[i] = $bytes[i];
}
arr
}
)
}
pub fn is_ipv4(ip: &str) -> bool {
Ipv4Addr::from_str(ip).is_ok()
}
pub fn is_ipv6(ip: &str) -> bool {
Ipv6Addr::from_str(ip).is_ok()
}
pub fn is_ip(ip: &str) -> bool {
is_ipv4(ip) || is_ipv6(ip)
}
// For detail, see page 7 of RFC 1035
pub fn is_hostname(hostname: &str) -> bool {
if hostname.len() > 255 {
return false;
}
lazy_static! {
static ref RE: Regex = Regex::new(r"[A-Za-z\d-]{1,63}$").unwrap();
}
let hostname = hostname.trim_right_matches('.');
hostname.as_bytes()
.split(|c| *c == b'.')
.all(|s| {
let s = str::from_utf8(s).ok().unwrap_or("");
!s.is_empty() && !s.starts_with('-') && !s.ends_with('-') && RE.is_match(s)
})
}
pub fn slice2ip4(data: &[u8]) -> Option<String> {
if data.len() >= 4 {
Some(format!("{}", Ipv4Addr::from(slice2sized!(data, 4))))
} else {
None
}
}
pub fn slice2ip6(data: &[u8]) -> Option<String> {
if data.len() >= 16 {
Some(format!("{}", Ipv6Addr::from(slice2sized!(data, 16))))
} else {
None
}
}
pub fn pair2addr4(ip: &str, port: u16) -> Option<SocketAddr> {
Ipv4Addr::from_str(ip).map(|ip| SocketAddr::new(IpAddr::V4(ip), port)).ok()
}
pub fn pair2addr6(ip: &str, port: u16) -> Option<SocketAddr> {
Ipv6Addr::from_str(ip).map(|ip| SocketAddr::new(IpAddr::V6(ip), port)).ok()
}
pub fn pair2addr(ip: &str, port: u16) -> Option<SocketAddr> {
pair2addr4(ip, port).or(pair2addr6(ip, port))
}
pub trait NetworkWriteBytes: WriteBytesExt {
fn put_u8(&mut self, num: u8) -> io::Result<()> {
self.write_u8(num)
}
fn put_u16(&mut self, num: u16) -> io::Result<()> {
self.write_u16::<NetworkEndian>(num)
}
fn put_i32(&mut self, num: i32) -> io::Result<()> {
self.write_i32::<NetworkEndian>(num)
}
}
impl NetworkWriteBytes for Vec<u8> {}
pub trait NetworkReadBytes: ReadBytesExt {
fn get_u8(&mut self) -> io::Result<u8> {
self.read_u8()
}
fn get_u16(&mut self) -> io::Result<u16> {
self.read_u16::<NetworkEndian>()
}
fn get_u32(&mut self) -> io::Result<u32> {
self.read_u32::<NetworkEndian>()
}
}
impl<'a> NetworkReadBytes for Cursor<&'a [u8]> {}
impl<'a> NetworkReadBytes for Cursor<&'a Vec<u8>> {}
impl<'a> NetworkReadBytes for &'a [u8] {
fn get_u8(&mut self) -> io::Result<u8> {
Cursor::new(self).read_u8()
}
fn get_u16(&mut self) -> io::Result<u16> {
Cursor::new(self).read_u16::<NetworkEndian>()
}
fn get_u32(&mut self) -> io::Result<u32> {
Cursor::new(self).read_u32::<NetworkEndian>()
}
}
#[macro_export]
macro_rules! pack {
(i32, $r:expr, $v:expr) => ( try_opt!($r.put_i32($v).ok()) );
(u16, $r:expr, $v:expr) => ( try_opt!($r.put_u16($v).ok()) );
(u8, $r:expr, $v:expr) => ( try_opt!($r.put_u8($v).ok()) );
}
#[macro_export]
macro_rules! unpack {
(u32, $r:expr) => ( try_opt!($r.get_u32().ok()) );
(u16, $r:expr) => ( try_opt!($r.get_u16().ok()) );
(u8, $r:expr) => ( try_opt!($r.get_u8().ok()) );
}
#[macro_export]
macro_rules! try_pack {
(i32, $r:expr, $v:expr) => ( $r.put_i32($v)? );
(u16, $r:expr, $v:expr) => ( $r.put_u16($v)? );
(u8, $r:expr, $v:expr) => ( $r.put_u8($v)? );
}
#[macro_export]
macro_rules! try_unpack {
(u32, $r:expr) => ( $r.get_u32()? );
(u16, $r:expr) => ( $r.get_u16()? );
(u8, $r:expr) => ( $r.get_u8()? );
}