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> {
19 Parser { s: s.as_bytes(), pos: 0 }
22 fn is_eof(&self) -> bool {
23 self.pos == self.s.len()
26 // Commit only if parser returns Some
27 fn read_atomically<T, F>(&mut self, cb: F) -> Option<T>
29 F: FnOnce(&mut Parser<'_>) -> Option<T>,
39 // Commit only if parser read till EOF
40 fn read_till_eof<T, F>(&mut self, cb: F) -> Option<T>
42 F: FnOnce(&mut Parser<'_>) -> Option<T>,
44 self.read_atomically(move |p| cb(p).filter(|_| p.is_eof()))
47 // Apply 3 parsers sequentially
48 fn read_seq_3<A, B, C, PA, PB, PC>(&mut self, pa: PA, pb: PB, pc: PC) -> Option<(A, B, C)>
50 PA: FnOnce(&mut Parser<'_>) -> Option<A>,
51 PB: FnOnce(&mut Parser<'_>) -> Option<B>,
52 PC: FnOnce(&mut Parser<'_>) -> Option<C>,
54 self.read_atomically(move |p| {
56 let b = if a.is_some() { pb(p) } else { None };
57 let c = if b.is_some() { pc(p) } else { None };
59 (Some(a), Some(b), Some(c)) => Some((a, b, c)),
66 fn read_char(&mut self) -> Option<char> {
70 let r = self.s[self.pos] as char;
76 // Return char and advance iff next char is equal to requested
77 fn read_given_char(&mut self, c: char) -> Option<char> {
78 self.read_atomically(|p| match p.read_char() {
79 Some(next) if next == c => Some(next),
85 fn read_digit(&mut self, radix: u8) -> Option<u8> {
86 fn parse_digit(c: char, radix: u8) -> Option<u8> {
88 // assuming radix is either 10 or 16
89 if c >= b'0' && c <= b'9' {
91 } else if radix > 10 && c >= b'a' && c < b'a' + (radix - 10) {
93 } else if radix > 10 && c >= b'A' && c < b'A' + (radix - 10) {
100 self.read_atomically(|p| p.read_char().and_then(|c| parse_digit(c, radix)))
103 fn read_number_impl(&mut self, radix: u8, max_digits: u32, upto: u32) -> Option<u32> {
105 let mut digit_count = 0;
107 match self.read_digit(radix) {
109 r = r * (radix as u32) + (d as u32);
111 if digit_count > max_digits || r >= upto {
116 if digit_count == 0 {
126 // Read number, failing if max_digits of number value exceeded
127 fn read_number(&mut self, radix: u8, max_digits: u32, upto: u32) -> Option<u32> {
128 self.read_atomically(|p| p.read_number_impl(radix, max_digits, upto))
131 fn read_ipv4_addr_impl(&mut self) -> Option<Ipv4Addr> {
135 if i != 0 && self.read_given_char('.').is_none() {
139 bs[i] = self.read_number(10, 3, 0x100).map(|n| n as u8)?;
142 Some(Ipv4Addr::new(bs[0], bs[1], bs[2], bs[3]))
146 fn read_ipv4_addr(&mut self) -> Option<Ipv4Addr> {
147 self.read_atomically(|p| p.read_ipv4_addr_impl())
150 fn read_ipv6_addr_impl(&mut self) -> Option<Ipv6Addr> {
151 fn ipv6_addr_from_head_tail(head: &[u16], tail: &[u16]) -> Ipv6Addr {
152 assert!(head.len() + tail.len() <= 8);
154 gs[..head.len()].copy_from_slice(head);
155 gs[(8 - tail.len())..8].copy_from_slice(tail);
156 Ipv6Addr::new(gs[0], gs[1], gs[2], gs[3], gs[4], gs[5], gs[6], gs[7])
159 fn read_groups(p: &mut Parser<'_>, groups: &mut [u16; 8], limit: usize) -> (usize, bool) {
163 let ipv4 = p.read_atomically(|p| {
164 if i == 0 || p.read_given_char(':').is_some() {
170 if let Some(v4_addr) = ipv4 {
171 let octets = v4_addr.octets();
172 groups[i + 0] = ((octets[0] as u16) << 8) | (octets[1] as u16);
173 groups[i + 1] = ((octets[2] as u16) << 8) | (octets[3] as u16);
174 return (i + 2, true);
178 let group = p.read_atomically(|p| {
179 if i == 0 || p.read_given_char(':').is_some() {
180 p.read_number(16, 4, 0x10000).map(|n| n as u16)
186 Some(g) => groups[i] = g,
187 None => return (i, false),
194 let mut head = [0; 8];
195 let (head_size, head_ipv4) = read_groups(self, &mut head, 8);
198 return Some(Ipv6Addr::new(
199 head[0], head[1], head[2], head[3], head[4], head[5], head[6], head[7],
203 // IPv4 part is not allowed before `::`
208 // read `::` if previous code parsed less than 8 groups
209 if self.read_given_char(':').is_none() || self.read_given_char(':').is_none() {
213 let mut tail = [0; 8];
214 // `::` indicates one or more groups of 16 bits of zeros
215 let limit = 8 - (head_size + 1);
216 let (tail_size, _) = read_groups(self, &mut tail, limit);
217 Some(ipv6_addr_from_head_tail(&head[..head_size], &tail[..tail_size]))
220 fn read_ipv6_addr(&mut self) -> Option<Ipv6Addr> {
221 self.read_atomically(|p| p.read_ipv6_addr_impl())
224 fn read_ip_addr(&mut self) -> Option<IpAddr> {
225 self.read_ipv4_addr().map(IpAddr::V4).or_else(|| self.read_ipv6_addr().map(IpAddr::V6))
228 fn read_socket_addr_v4(&mut self) -> Option<SocketAddrV4> {
229 let ip_addr = |p: &mut Parser<'_>| p.read_ipv4_addr();
230 let colon = |p: &mut Parser<'_>| p.read_given_char(':');
231 let port = |p: &mut Parser<'_>| p.read_number(10, 5, 0x10000).map(|n| n as u16);
233 self.read_seq_3(ip_addr, colon, port).map(|t| {
234 let (ip, _, port): (Ipv4Addr, char, u16) = t;
235 SocketAddrV4::new(ip, port)
239 fn read_socket_addr_v6(&mut self) -> Option<SocketAddrV6> {
240 let ip_addr = |p: &mut Parser<'_>| {
241 let open_br = |p: &mut Parser<'_>| p.read_given_char('[');
242 let ip_addr = |p: &mut Parser<'_>| p.read_ipv6_addr();
243 let clos_br = |p: &mut Parser<'_>| p.read_given_char(']');
244 p.read_seq_3(open_br, ip_addr, clos_br).map(|t| t.1)
246 let colon = |p: &mut Parser<'_>| p.read_given_char(':');
247 let port = |p: &mut Parser<'_>| p.read_number(10, 5, 0x10000).map(|n| n as u16);
249 self.read_seq_3(ip_addr, colon, port).map(|t| {
250 let (ip, _, port): (Ipv6Addr, char, u16) = t;
251 SocketAddrV6::new(ip, port, 0, 0)
255 fn read_socket_addr(&mut self) -> Option<SocketAddr> {
256 self.read_socket_addr_v4()
258 .or_else(|| self.read_socket_addr_v6().map(SocketAddr::V6))
262 #[stable(feature = "ip_addr", since = "1.7.0")]
263 impl FromStr for IpAddr {
264 type Err = AddrParseError;
265 fn from_str(s: &str) -> Result<IpAddr, AddrParseError> {
266 match Parser::new(s).read_till_eof(|p| p.read_ip_addr()) {
268 None => Err(AddrParseError(())),
273 #[stable(feature = "rust1", since = "1.0.0")]
274 impl FromStr for Ipv4Addr {
275 type Err = AddrParseError;
276 fn from_str(s: &str) -> Result<Ipv4Addr, AddrParseError> {
277 match Parser::new(s).read_till_eof(|p| p.read_ipv4_addr()) {
279 None => Err(AddrParseError(())),
284 #[stable(feature = "rust1", since = "1.0.0")]
285 impl FromStr for Ipv6Addr {
286 type Err = AddrParseError;
287 fn from_str(s: &str) -> Result<Ipv6Addr, AddrParseError> {
288 match Parser::new(s).read_till_eof(|p| p.read_ipv6_addr()) {
290 None => Err(AddrParseError(())),
295 #[stable(feature = "socket_addr_from_str", since = "1.5.0")]
296 impl FromStr for SocketAddrV4 {
297 type Err = AddrParseError;
298 fn from_str(s: &str) -> Result<SocketAddrV4, AddrParseError> {
299 match Parser::new(s).read_till_eof(|p| p.read_socket_addr_v4()) {
301 None => Err(AddrParseError(())),
306 #[stable(feature = "socket_addr_from_str", since = "1.5.0")]
307 impl FromStr for SocketAddrV6 {
308 type Err = AddrParseError;
309 fn from_str(s: &str) -> Result<SocketAddrV6, AddrParseError> {
310 match Parser::new(s).read_till_eof(|p| p.read_socket_addr_v6()) {
312 None => Err(AddrParseError(())),
317 #[stable(feature = "rust1", since = "1.0.0")]
318 impl FromStr for SocketAddr {
319 type Err = AddrParseError;
320 fn from_str(s: &str) -> Result<SocketAddr, AddrParseError> {
321 match Parser::new(s).read_till_eof(|p| p.read_socket_addr()) {
323 None => Err(AddrParseError(())),
328 /// An error which can be returned when parsing an IP address or a socket address.
330 /// This error is used as the error type for the [`FromStr`] implementation for
331 /// [`IpAddr`], [`Ipv4Addr`], [`Ipv6Addr`], [`SocketAddr`], [`SocketAddrV4`], and
332 /// [`SocketAddrV6`].
334 /// # Potential causes
336 /// `AddrParseError` may be thrown because the provided string does not parse as the given type,
337 /// often because it includes information only handled by a different address type.
340 /// use std::net::IpAddr;
341 /// let _foo: IpAddr = "127.0.0.1:8080".parse().expect("Cannot handle the socket port");
344 /// [`IpAddr`] doesn't handle the port. Use [`SocketAddr`] instead.
347 /// use std::net::SocketAddr;
349 /// // No problem, the `panic!` message has disappeared.
350 /// let _foo: SocketAddr = "127.0.0.1:8080".parse().expect("unreachable panic");
353 /// [`FromStr`]: ../../std/str/trait.FromStr.html
354 /// [`IpAddr`]: ../../std/net/enum.IpAddr.html
355 /// [`Ipv4Addr`]: ../../std/net/struct.Ipv4Addr.html
356 /// [`Ipv6Addr`]: ../../std/net/struct.Ipv6Addr.html
357 /// [`SocketAddr`]: ../../std/net/enum.SocketAddr.html
358 /// [`SocketAddrV4`]: ../../std/net/struct.SocketAddrV4.html
359 /// [`SocketAddrV6`]: ../../std/net/struct.SocketAddrV6.html
360 #[stable(feature = "rust1", since = "1.0.0")]
361 #[derive(Debug, Clone, PartialEq, Eq)]
362 pub struct AddrParseError(());
364 #[stable(feature = "addr_parse_error_error", since = "1.4.0")]
365 impl fmt::Display for AddrParseError {
366 #[allow(deprecated, deprecated_in_future)]
367 fn fmt(&self, fmt: &mut fmt::Formatter<'_>) -> fmt::Result {
368 fmt.write_str(self.description())
372 #[stable(feature = "addr_parse_error_error", since = "1.4.0")]
373 impl Error for AddrParseError {
375 fn description(&self) -> &str {
376 "invalid IP address syntax"