1 // Copyright 2015 The Rust Project Developers. See the COPYRIGHT
2 // file at the top-level directory of this distribution and at
3 // http://rust-lang.org/COPYRIGHT.
5 // Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or
6 // http://www.apache.org/licenses/LICENSE-2.0> or the MIT license
7 // <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your
8 // option. This file may not be copied, modified, or distributed
9 // except according to those terms.
11 //! A private parser implementation of IPv4, IPv6, and socket addresses.
13 //! This module is "publicly exported" through the `FromStr` implementations
18 use net::{IpAddr, Ipv4Addr, Ipv6Addr, SocketAddr, SocketAddrV4, SocketAddrV6};
22 // parsing as ASCII, so can use byte array
28 fn new(s: &'a str) -> Parser<'a> {
35 fn is_eof(&self) -> bool {
36 self.pos == self.s.len()
39 // Commit only if parser returns Some
40 fn read_atomically<T, F>(&mut self, cb: F) -> Option<T> where
41 F: FnOnce(&mut Parser) -> Option<T>,
51 // Commit only if parser read till EOF
52 fn read_till_eof<T, F>(&mut self, cb: F) -> Option<T> where
53 F: FnOnce(&mut Parser) -> Option<T>,
55 self.read_atomically(move |p| {
57 Some(x) => if p.is_eof() {Some(x)} else {None},
63 // Return result of first successful parser
64 fn read_or<T>(&mut self, parsers: &mut [Box<FnMut(&mut Parser) -> Option<T> + 'static>])
67 if let Some(r) = self.read_atomically(|p: &mut Parser| pf(p)) {
74 // Apply 3 parsers sequentially
75 fn read_seq_3<A, B, C, PA, PB, PC>(&mut self,
79 -> Option<(A, B, C)> where
80 PA: FnOnce(&mut Parser) -> Option<A>,
81 PB: FnOnce(&mut Parser) -> Option<B>,
82 PC: FnOnce(&mut Parser) -> Option<C>,
84 self.read_atomically(move |p| {
86 let b = if a.is_some() { pb(p) } else { None };
87 let c = if b.is_some() { pc(p) } else { None };
89 (Some(a), Some(b), Some(c)) => Some((a, b, c)),
96 fn read_char(&mut self) -> Option<char> {
100 let r = self.s[self.pos] as char;
106 // Return char and advance iff next char is equal to requested
107 fn read_given_char(&mut self, c: char) -> Option<char> {
108 self.read_atomically(|p| {
109 match p.read_char() {
110 Some(next) if next == c => Some(next),
117 fn read_digit(&mut self, radix: u8) -> Option<u8> {
118 fn parse_digit(c: char, radix: u8) -> Option<u8> {
120 // assuming radix is either 10 or 16
121 if c >= b'0' && c <= b'9' {
123 } else if radix > 10 && c >= b'a' && c < b'a' + (radix - 10) {
125 } else if radix > 10 && c >= b'A' && c < b'A' + (radix - 10) {
132 self.read_atomically(|p| {
133 p.read_char().and_then(|c| parse_digit(c, radix))
137 fn read_number_impl(&mut self, radix: u8, max_digits: u32, upto: u32) -> Option<u32> {
139 let mut digit_count = 0;
141 match self.read_digit(radix) {
143 r = r * (radix as u32) + (d as u32);
145 if digit_count > max_digits || r >= upto {
150 if digit_count == 0 {
160 // Read number, failing if max_digits of number value exceeded
161 fn read_number(&mut self, radix: u8, max_digits: u32, upto: u32) -> Option<u32> {
162 self.read_atomically(|p| p.read_number_impl(radix, max_digits, upto))
165 fn read_ipv4_addr_impl(&mut self) -> Option<Ipv4Addr> {
169 if i != 0 && self.read_given_char('.').is_none() {
173 let octet = self.read_number(10, 3, 0x100).map(|n| n as u8);
175 Some(d) => bs[i] = d,
180 Some(Ipv4Addr::new(bs[0], bs[1], bs[2], bs[3]))
184 fn read_ipv4_addr(&mut self) -> Option<Ipv4Addr> {
185 self.read_atomically(|p| p.read_ipv4_addr_impl())
188 fn read_ipv6_addr_impl(&mut self) -> Option<Ipv6Addr> {
189 fn ipv6_addr_from_head_tail(head: &[u16], tail: &[u16]) -> Ipv6Addr {
190 assert!(head.len() + tail.len() <= 8);
192 gs[..head.len()].copy_from_slice(head);
193 gs[(8 - tail.len()) .. 8].copy_from_slice(tail);
194 Ipv6Addr::new(gs[0], gs[1], gs[2], gs[3], gs[4], gs[5], gs[6], gs[7])
197 fn read_groups(p: &mut Parser, groups: &mut [u16; 8], limit: usize)
202 let ipv4 = p.read_atomically(|p| {
203 if i == 0 || p.read_given_char(':').is_some() {
209 if let Some(v4_addr) = ipv4 {
210 let octets = v4_addr.octets();
211 groups[i + 0] = ((octets[0] as u16) << 8) | (octets[1] as u16);
212 groups[i + 1] = ((octets[2] as u16) << 8) | (octets[3] as u16);
213 return (i + 2, true);
217 let group = p.read_atomically(|p| {
218 if i == 0 || p.read_given_char(':').is_some() {
219 p.read_number(16, 4, 0x10000).map(|n| n as u16)
225 Some(g) => groups[i] = g,
226 None => return (i, false)
233 let mut head = [0; 8];
234 let (head_size, head_ipv4) = read_groups(self, &mut head, 8);
237 return Some(Ipv6Addr::new(
238 head[0], head[1], head[2], head[3],
239 head[4], head[5], head[6], head[7]))
242 // IPv4 part is not allowed before `::`
247 // read `::` if previous code parsed less than 8 groups
248 if !self.read_given_char(':').is_some() || !self.read_given_char(':').is_some() {
252 let mut tail = [0; 8];
253 let (tail_size, _) = read_groups(self, &mut tail, 8 - head_size);
254 Some(ipv6_addr_from_head_tail(&head[..head_size], &tail[..tail_size]))
257 fn read_ipv6_addr(&mut self) -> Option<Ipv6Addr> {
258 self.read_atomically(|p| p.read_ipv6_addr_impl())
261 fn read_ip_addr(&mut self) -> Option<IpAddr> {
262 let ipv4_addr = |p: &mut Parser| p.read_ipv4_addr().map(IpAddr::V4);
263 let ipv6_addr = |p: &mut Parser| p.read_ipv6_addr().map(IpAddr::V6);
264 self.read_or(&mut [Box::new(ipv4_addr), Box::new(ipv6_addr)])
267 fn read_socket_addr_v4(&mut self) -> Option<SocketAddrV4> {
268 let ip_addr = |p: &mut Parser| p.read_ipv4_addr();
269 let colon = |p: &mut Parser| p.read_given_char(':');
270 let port = |p: &mut Parser| {
271 p.read_number(10, 5, 0x10000).map(|n| n as u16)
274 self.read_seq_3(ip_addr, colon, port).map(|t| {
275 let (ip, _, port): (Ipv4Addr, char, u16) = t;
276 SocketAddrV4::new(ip, port)
280 fn read_socket_addr_v6(&mut self) -> Option<SocketAddrV6> {
281 let ip_addr = |p: &mut Parser| {
282 let open_br = |p: &mut Parser| p.read_given_char('[');
283 let ip_addr = |p: &mut Parser| p.read_ipv6_addr();
284 let clos_br = |p: &mut Parser| p.read_given_char(']');
285 p.read_seq_3(open_br, ip_addr, clos_br).map(|t| t.1)
287 let colon = |p: &mut Parser| p.read_given_char(':');
288 let port = |p: &mut Parser| {
289 p.read_number(10, 5, 0x10000).map(|n| n as u16)
292 self.read_seq_3(ip_addr, colon, port).map(|t| {
293 let (ip, _, port): (Ipv6Addr, char, u16) = t;
294 SocketAddrV6::new(ip, port, 0, 0)
298 fn read_socket_addr(&mut self) -> Option<SocketAddr> {
299 let v4 = |p: &mut Parser| p.read_socket_addr_v4().map(SocketAddr::V4);
300 let v6 = |p: &mut Parser| p.read_socket_addr_v6().map(SocketAddr::V6);
301 self.read_or(&mut [Box::new(v4), Box::new(v6)])
305 #[stable(feature = "rust1", since = "1.0.0")]
306 impl FromStr for IpAddr {
307 type Err = AddrParseError;
308 fn from_str(s: &str) -> Result<IpAddr, AddrParseError> {
309 match Parser::new(s).read_till_eof(|p| p.read_ip_addr()) {
311 None => Err(AddrParseError(()))
316 #[stable(feature = "rust1", since = "1.0.0")]
317 impl FromStr for Ipv4Addr {
318 type Err = AddrParseError;
319 fn from_str(s: &str) -> Result<Ipv4Addr, AddrParseError> {
320 match Parser::new(s).read_till_eof(|p| p.read_ipv4_addr()) {
322 None => Err(AddrParseError(()))
327 #[stable(feature = "rust1", since = "1.0.0")]
328 impl FromStr for Ipv6Addr {
329 type Err = AddrParseError;
330 fn from_str(s: &str) -> Result<Ipv6Addr, AddrParseError> {
331 match Parser::new(s).read_till_eof(|p| p.read_ipv6_addr()) {
333 None => Err(AddrParseError(()))
338 #[stable(feature = "socket_addr_from_str", since = "1.5.0")]
339 impl FromStr for SocketAddrV4 {
340 type Err = AddrParseError;
341 fn from_str(s: &str) -> Result<SocketAddrV4, AddrParseError> {
342 match Parser::new(s).read_till_eof(|p| p.read_socket_addr_v4()) {
344 None => Err(AddrParseError(())),
349 #[stable(feature = "socket_addr_from_str", since = "1.5.0")]
350 impl FromStr for SocketAddrV6 {
351 type Err = AddrParseError;
352 fn from_str(s: &str) -> Result<SocketAddrV6, AddrParseError> {
353 match Parser::new(s).read_till_eof(|p| p.read_socket_addr_v6()) {
355 None => Err(AddrParseError(())),
360 #[stable(feature = "rust1", since = "1.0.0")]
361 impl FromStr for SocketAddr {
362 type Err = AddrParseError;
363 fn from_str(s: &str) -> Result<SocketAddr, AddrParseError> {
364 match Parser::new(s).read_till_eof(|p| p.read_socket_addr()) {
366 None => Err(AddrParseError(())),
371 /// An error returned when parsing an IP address or a socket address.
372 #[stable(feature = "rust1", since = "1.0.0")]
373 #[derive(Debug, Clone, PartialEq)]
374 pub struct AddrParseError(());
376 #[stable(feature = "addr_parse_error_error", since = "1.4.0")]
377 impl fmt::Display for AddrParseError {
378 fn fmt(&self, fmt: &mut fmt::Formatter) -> fmt::Result {
379 fmt.write_str(self.description())
383 #[stable(feature = "addr_parse_error_error", since = "1.4.0")]
384 impl Error for AddrParseError {
385 fn description(&self) -> &str {
386 "invalid IP address syntax"