1 //! A private parser implementation of IPv4, IPv6, and socket addresses.
3 //! This module is "publicly exported" through the `FromStr` implementations
6 use crate::error::Error;
8 use crate::net::{IpAddr, Ipv4Addr, Ipv6Addr, SocketAddr, SocketAddrV4, SocketAddrV6};
9 use crate::str::FromStr;
12 // parsing as ASCII, so can use byte array
18 fn new(s: &'a str) -> Parser<'a> {
25 fn is_eof(&self) -> bool {
26 self.pos == self.s.len()
29 // Commit only if parser returns Some
30 fn read_atomically<T, F>(&mut self, cb: F) -> Option<T> where
31 F: FnOnce(&mut Parser<'_>) -> Option<T>,
41 // Commit only if parser read till EOF
42 fn read_till_eof<T, F>(&mut self, cb: F) -> Option<T> where
43 F: FnOnce(&mut Parser<'_>) -> Option<T>,
45 self.read_atomically(move |p| {
46 cb(p).filter(|_| p.is_eof())
50 // Return result of first successful parser
51 fn read_or<T>(&mut self, parsers: &mut [Box<dyn FnMut(&mut Parser<'_>) -> Option<T> + 'static>])
54 if let Some(r) = self.read_atomically(|p: &mut Parser<'_>| pf(p)) {
61 // Apply 3 parsers sequentially
62 fn read_seq_3<A, B, C, PA, PB, PC>(&mut self,
66 -> Option<(A, B, C)> where
67 PA: FnOnce(&mut Parser<'_>) -> Option<A>,
68 PB: FnOnce(&mut Parser<'_>) -> Option<B>,
69 PC: FnOnce(&mut Parser<'_>) -> Option<C>,
71 self.read_atomically(move |p| {
73 let b = if a.is_some() { pb(p) } else { None };
74 let c = if b.is_some() { pc(p) } else { None };
76 (Some(a), Some(b), Some(c)) => Some((a, b, c)),
83 fn read_char(&mut self) -> Option<char> {
87 let r = self.s[self.pos] as char;
93 // Return char and advance iff next char is equal to requested
94 fn read_given_char(&mut self, c: char) -> Option<char> {
95 self.read_atomically(|p| {
97 Some(next) if next == c => Some(next),
104 fn read_digit(&mut self, radix: u8) -> Option<u8> {
105 fn parse_digit(c: char, radix: u8) -> Option<u8> {
107 // assuming radix is either 10 or 16
108 if c >= b'0' && c <= b'9' {
110 } else if radix > 10 && c >= b'a' && c < b'a' + (radix - 10) {
112 } else if radix > 10 && c >= b'A' && c < b'A' + (radix - 10) {
119 self.read_atomically(|p| {
120 p.read_char().and_then(|c| parse_digit(c, radix))
124 fn read_number_impl(&mut self, radix: u8, max_digits: u32, upto: u32) -> Option<u32> {
126 let mut digit_count = 0;
128 match self.read_digit(radix) {
130 r = r * (radix as u32) + (d as u32);
132 if digit_count > max_digits || r >= upto {
137 if digit_count == 0 {
147 // Read number, failing if max_digits of number value exceeded
148 fn read_number(&mut self, radix: u8, max_digits: u32, upto: u32) -> Option<u32> {
149 self.read_atomically(|p| p.read_number_impl(radix, max_digits, upto))
152 fn read_ipv4_addr_impl(&mut self) -> Option<Ipv4Addr> {
156 if i != 0 && self.read_given_char('.').is_none() {
160 bs[i] = self.read_number(10, 3, 0x100).map(|n| n as u8)?;
163 Some(Ipv4Addr::new(bs[0], bs[1], bs[2], bs[3]))
167 fn read_ipv4_addr(&mut self) -> Option<Ipv4Addr> {
168 self.read_atomically(|p| p.read_ipv4_addr_impl())
171 fn read_ipv6_addr_impl(&mut self) -> Option<Ipv6Addr> {
172 fn ipv6_addr_from_head_tail(head: &[u16], tail: &[u16]) -> Ipv6Addr {
173 assert!(head.len() + tail.len() <= 8);
175 gs[..head.len()].copy_from_slice(head);
176 gs[(8 - tail.len()) .. 8].copy_from_slice(tail);
177 Ipv6Addr::new(gs[0], gs[1], gs[2], gs[3], gs[4], gs[5], gs[6], gs[7])
180 fn read_groups(p: &mut Parser<'_>, groups: &mut [u16; 8], limit: usize)
185 let ipv4 = p.read_atomically(|p| {
186 if i == 0 || p.read_given_char(':').is_some() {
192 if let Some(v4_addr) = ipv4 {
193 let octets = v4_addr.octets();
194 groups[i + 0] = ((octets[0] as u16) << 8) | (octets[1] as u16);
195 groups[i + 1] = ((octets[2] as u16) << 8) | (octets[3] as u16);
196 return (i + 2, true);
200 let group = p.read_atomically(|p| {
201 if i == 0 || p.read_given_char(':').is_some() {
202 p.read_number(16, 4, 0x10000).map(|n| n as u16)
208 Some(g) => groups[i] = g,
209 None => return (i, false)
216 let mut head = [0; 8];
217 let (head_size, head_ipv4) = read_groups(self, &mut head, 8);
220 return Some(Ipv6Addr::new(
221 head[0], head[1], head[2], head[3],
222 head[4], head[5], head[6], head[7]))
225 // IPv4 part is not allowed before `::`
230 // read `::` if previous code parsed less than 8 groups
231 if !self.read_given_char(':').is_some() || !self.read_given_char(':').is_some() {
235 let mut tail = [0; 8];
236 // `::` indicates one or more groups of 16 bits of zeros
237 let limit = 8 - (head_size + 1);
238 let (tail_size, _) = read_groups(self, &mut tail, limit);
239 Some(ipv6_addr_from_head_tail(&head[..head_size], &tail[..tail_size]))
242 fn read_ipv6_addr(&mut self) -> Option<Ipv6Addr> {
243 self.read_atomically(|p| p.read_ipv6_addr_impl())
246 fn read_ip_addr(&mut self) -> Option<IpAddr> {
247 let ipv4_addr = |p: &mut Parser<'_>| p.read_ipv4_addr().map(IpAddr::V4);
248 let ipv6_addr = |p: &mut Parser<'_>| p.read_ipv6_addr().map(IpAddr::V6);
249 self.read_or(&mut [Box::new(ipv4_addr), Box::new(ipv6_addr)])
252 fn read_socket_addr_v4(&mut self) -> Option<SocketAddrV4> {
253 let ip_addr = |p: &mut Parser<'_>| p.read_ipv4_addr();
254 let colon = |p: &mut Parser<'_>| p.read_given_char(':');
255 let port = |p: &mut Parser<'_>| {
256 p.read_number(10, 5, 0x10000).map(|n| n as u16)
259 self.read_seq_3(ip_addr, colon, port).map(|t| {
260 let (ip, _, port): (Ipv4Addr, char, u16) = t;
261 SocketAddrV4::new(ip, port)
265 fn read_socket_addr_v6(&mut self) -> Option<SocketAddrV6> {
266 let ip_addr = |p: &mut Parser<'_>| {
267 let open_br = |p: &mut Parser<'_>| p.read_given_char('[');
268 let ip_addr = |p: &mut Parser<'_>| p.read_ipv6_addr();
269 let clos_br = |p: &mut Parser<'_>| p.read_given_char(']');
270 p.read_seq_3(open_br, ip_addr, clos_br).map(|t| t.1)
272 let colon = |p: &mut Parser<'_>| p.read_given_char(':');
273 let port = |p: &mut Parser<'_>| {
274 p.read_number(10, 5, 0x10000).map(|n| n as u16)
277 self.read_seq_3(ip_addr, colon, port).map(|t| {
278 let (ip, _, port): (Ipv6Addr, char, u16) = t;
279 SocketAddrV6::new(ip, port, 0, 0)
283 fn read_socket_addr(&mut self) -> Option<SocketAddr> {
284 let v4 = |p: &mut Parser<'_>| p.read_socket_addr_v4().map(SocketAddr::V4);
285 let v6 = |p: &mut Parser<'_>| p.read_socket_addr_v6().map(SocketAddr::V6);
286 self.read_or(&mut [Box::new(v4), Box::new(v6)])
290 #[stable(feature = "ip_addr", since = "1.7.0")]
291 impl FromStr for IpAddr {
292 type Err = AddrParseError;
293 fn from_str(s: &str) -> Result<IpAddr, AddrParseError> {
294 match Parser::new(s).read_till_eof(|p| p.read_ip_addr()) {
296 None => Err(AddrParseError(()))
301 #[stable(feature = "rust1", since = "1.0.0")]
302 impl FromStr for Ipv4Addr {
303 type Err = AddrParseError;
304 fn from_str(s: &str) -> Result<Ipv4Addr, AddrParseError> {
305 match Parser::new(s).read_till_eof(|p| p.read_ipv4_addr()) {
307 None => Err(AddrParseError(()))
312 #[stable(feature = "rust1", since = "1.0.0")]
313 impl FromStr for Ipv6Addr {
314 type Err = AddrParseError;
315 fn from_str(s: &str) -> Result<Ipv6Addr, AddrParseError> {
316 match Parser::new(s).read_till_eof(|p| p.read_ipv6_addr()) {
318 None => Err(AddrParseError(()))
323 #[stable(feature = "socket_addr_from_str", since = "1.5.0")]
324 impl FromStr for SocketAddrV4 {
325 type Err = AddrParseError;
326 fn from_str(s: &str) -> Result<SocketAddrV4, AddrParseError> {
327 match Parser::new(s).read_till_eof(|p| p.read_socket_addr_v4()) {
329 None => Err(AddrParseError(())),
334 #[stable(feature = "socket_addr_from_str", since = "1.5.0")]
335 impl FromStr for SocketAddrV6 {
336 type Err = AddrParseError;
337 fn from_str(s: &str) -> Result<SocketAddrV6, AddrParseError> {
338 match Parser::new(s).read_till_eof(|p| p.read_socket_addr_v6()) {
340 None => Err(AddrParseError(())),
345 #[stable(feature = "rust1", since = "1.0.0")]
346 impl FromStr for SocketAddr {
347 type Err = AddrParseError;
348 fn from_str(s: &str) -> Result<SocketAddr, AddrParseError> {
349 match Parser::new(s).read_till_eof(|p| p.read_socket_addr()) {
351 None => Err(AddrParseError(())),
356 /// An error which can be returned when parsing an IP address or a socket address.
358 /// This error is used as the error type for the [`FromStr`] implementation for
359 /// [`IpAddr`], [`Ipv4Addr`], [`Ipv6Addr`], [`SocketAddr`], [`SocketAddrV4`], and
360 /// [`SocketAddrV6`].
362 /// # Potential causes
364 /// `AddrParseError` may be thrown because the provided string does not parse as the given type,
365 /// often because it includes information only handled by a different address type.
368 /// use std::net::IpAddr;
369 /// let _foo: IpAddr = "127.0.0.1:8080".parse().expect("Cannot handle the socket port");
372 /// [`IpAddr`] doesn't handle the port. Use [`SocketAddr`] instead.
375 /// use std::net::SocketAddr;
377 /// // No problem, the `panic!` message has disappeared.
378 /// let _foo: SocketAddr = "127.0.0.1:8080".parse().expect("unreachable panic");
381 /// [`FromStr`]: ../../std/str/trait.FromStr.html
382 /// [`IpAddr`]: ../../std/net/enum.IpAddr.html
383 /// [`Ipv4Addr`]: ../../std/net/struct.Ipv4Addr.html
384 /// [`Ipv6Addr`]: ../../std/net/struct.Ipv6Addr.html
385 /// [`SocketAddr`]: ../../std/net/enum.SocketAddr.html
386 /// [`SocketAddrV4`]: ../../std/net/struct.SocketAddrV4.html
387 /// [`SocketAddrV6`]: ../../std/net/struct.SocketAddrV6.html
388 #[stable(feature = "rust1", since = "1.0.0")]
389 #[derive(Debug, Clone, PartialEq, Eq)]
390 pub struct AddrParseError(());
392 #[stable(feature = "addr_parse_error_error", since = "1.4.0")]
393 impl fmt::Display for AddrParseError {
394 fn fmt(&self, fmt: &mut fmt::Formatter<'_>) -> fmt::Result {
395 fmt.write_str(self.description())
399 #[stable(feature = "addr_parse_error_error", since = "1.4.0")]
400 impl Error for AddrParseError {
401 fn description(&self) -> &str {
402 "invalid IP address syntax"