summaryrefslogtreecommitdiffstats
path: root/vendor/ipnet/src/parser.rs
diff options
context:
space:
mode:
Diffstat (limited to 'vendor/ipnet/src/parser.rs')
-rw-r--r--vendor/ipnet/src/parser.rs345
1 files changed, 345 insertions, 0 deletions
diff --git a/vendor/ipnet/src/parser.rs b/vendor/ipnet/src/parser.rs
new file mode 100644
index 000000000..7ec999128
--- /dev/null
+++ b/vendor/ipnet/src/parser.rs
@@ -0,0 +1,345 @@
+//! A private parser implementation of IPv4 and IPv6 network addresses.
+//!
+//! The existing `std::net::parser` module cannot be extended because it
+//! is private. It is copied and extended here with methods for parsing
+//! IP network addresses.
+
+use std::error::Error;
+use std::fmt;
+use std::net::{Ipv4Addr, Ipv6Addr};
+use std::str::FromStr;
+
+use crate::ipnet::{IpNet, Ipv4Net, Ipv6Net};
+
+pub struct Parser<'a> {
+ // parsing as ASCII, so can use byte array
+ s: &'a [u8],
+ pos: usize,
+}
+
+impl<'a> Parser<'a> {
+ fn new(s: &'a str) -> Parser<'a> {
+ Parser {
+ s: s.as_bytes(),
+ pos: 0,
+ }
+ }
+
+ fn is_eof(&self) -> bool {
+ self.pos == self.s.len()
+ }
+
+ // Commit only if parser returns Some
+ fn read_atomically<T, F>(&mut self, cb: F) -> Option<T> where
+ F: FnOnce(&mut Parser) -> Option<T>,
+ {
+ let pos = self.pos;
+ let r = cb(self);
+ if r.is_none() {
+ self.pos = pos;
+ }
+ r
+ }
+
+ // Commit only if parser read till EOF
+ fn read_till_eof<T, F>(&mut self, cb: F) -> Option<T> where
+ F: FnOnce(&mut Parser) -> Option<T>,
+ {
+ self.read_atomically(move |p| {
+ match cb(p) {
+ Some(x) => if p.is_eof() {Some(x)} else {None},
+ None => None,
+ }
+ })
+ }
+
+ // Return result of first successful parser
+ fn read_or<T>(&mut self, parsers: &mut [Box<dyn FnMut(&mut Parser) -> Option<T> + 'static>])
+ -> Option<T> {
+ for pf in parsers {
+ if let Some(r) = self.read_atomically(|p: &mut Parser| pf(p)) {
+ return Some(r);
+ }
+ }
+ None
+ }
+
+ // Apply 3 parsers sequentially
+ fn read_seq_3<A, B, C, PA, PB, PC>(&mut self,
+ pa: PA,
+ pb: PB,
+ pc: PC)
+ -> Option<(A, B, C)> where
+ PA: FnOnce(&mut Parser) -> Option<A>,
+ PB: FnOnce(&mut Parser) -> Option<B>,
+ PC: FnOnce(&mut Parser) -> Option<C>,
+ {
+ self.read_atomically(move |p| {
+ let a = pa(p);
+ let b = if a.is_some() { pb(p) } else { None };
+ let c = if b.is_some() { pc(p) } else { None };
+ match (a, b, c) {
+ (Some(a), Some(b), Some(c)) => Some((a, b, c)),
+ _ => None
+ }
+ })
+ }
+
+ // Read next char
+ fn read_char(&mut self) -> Option<char> {
+ if self.is_eof() {
+ None
+ } else {
+ let r = self.s[self.pos] as char;
+ self.pos += 1;
+ Some(r)
+ }
+ }
+
+ // Return char and advance iff next char is equal to requested
+ fn read_given_char(&mut self, c: char) -> Option<char> {
+ self.read_atomically(|p| {
+ match p.read_char() {
+ Some(next) if next == c => Some(next),
+ _ => None,
+ }
+ })
+ }
+
+ // Read digit
+ fn read_digit(&mut self, radix: u8) -> Option<u8> {
+ fn parse_digit(c: char, radix: u8) -> Option<u8> {
+ let c = c as u8;
+ // assuming radix is either 10 or 16
+ if c >= b'0' && c <= b'9' {
+ Some(c - b'0')
+ } else if radix > 10 && c >= b'a' && c < b'a' + (radix - 10) {
+ Some(c - b'a' + 10)
+ } else if radix > 10 && c >= b'A' && c < b'A' + (radix - 10) {
+ Some(c - b'A' + 10)
+ } else {
+ None
+ }
+ }
+
+ self.read_atomically(|p| {
+ p.read_char().and_then(|c| parse_digit(c, radix))
+ })
+ }
+
+ fn read_number_impl(&mut self, radix: u8, max_digits: u32, upto: u32) -> Option<u32> {
+ let mut r = 0;
+ let mut digit_count = 0;
+ loop {
+ match self.read_digit(radix) {
+ Some(d) => {
+ r = r * (radix as u32) + (d as u32);
+ digit_count += 1;
+ if digit_count > max_digits || r >= upto {
+ return None
+ }
+ }
+ None => {
+ if digit_count == 0 {
+ return None
+ } else {
+ return Some(r)
+ }
+ }
+ };
+ }
+ }
+
+ // Read number, failing if max_digits of number value exceeded
+ fn read_number(&mut self, radix: u8, max_digits: u32, upto: u32) -> Option<u32> {
+ self.read_atomically(|p| p.read_number_impl(radix, max_digits, upto))
+ }
+
+ fn read_ipv4_addr_impl(&mut self) -> Option<Ipv4Addr> {
+ let mut bs = [0; 4];
+ let mut i = 0;
+ while i < 4 {
+ if i != 0 && self.read_given_char('.').is_none() {
+ return None;
+ }
+
+ let octet = self.read_number(10, 3, 0x100).map(|n| n as u8);
+ match octet {
+ Some(d) => bs[i] = d,
+ None => return None,
+ };
+ i += 1;
+ }
+ Some(Ipv4Addr::new(bs[0], bs[1], bs[2], bs[3]))
+ }
+
+ // Read IPv4 address
+ fn read_ipv4_addr(&mut self) -> Option<Ipv4Addr> {
+ self.read_atomically(|p| p.read_ipv4_addr_impl())
+ }
+
+ fn read_ipv6_addr_impl(&mut self) -> Option<Ipv6Addr> {
+ fn ipv6_addr_from_head_tail(head: &[u16], tail: &[u16]) -> Ipv6Addr {
+ assert!(head.len() + tail.len() <= 8);
+ let mut gs = [0; 8];
+ gs[..head.len()].copy_from_slice(head);
+ gs[(8 - tail.len()) .. 8].copy_from_slice(tail);
+ Ipv6Addr::new(gs[0], gs[1], gs[2], gs[3], gs[4], gs[5], gs[6], gs[7])
+ }
+
+ fn read_groups(p: &mut Parser, groups: &mut [u16; 8], limit: usize)
+ -> (usize, bool) {
+ let mut i = 0;
+ while i < limit {
+ if i < limit - 1 {
+ let ipv4 = p.read_atomically(|p| {
+ if i == 0 || p.read_given_char(':').is_some() {
+ p.read_ipv4_addr()
+ } else {
+ None
+ }
+ });
+ if let Some(v4_addr) = ipv4 {
+ let octets = v4_addr.octets();
+ groups[i + 0] = ((octets[0] as u16) << 8) | (octets[1] as u16);
+ groups[i + 1] = ((octets[2] as u16) << 8) | (octets[3] as u16);
+ return (i + 2, true);
+ }
+ }
+
+ let group = p.read_atomically(|p| {
+ if i == 0 || p.read_given_char(':').is_some() {
+ p.read_number(16, 4, 0x10000).map(|n| n as u16)
+ } else {
+ None
+ }
+ });
+ match group {
+ Some(g) => groups[i] = g,
+ None => return (i, false)
+ }
+ i += 1;
+ }
+ (i, false)
+ }
+
+ let mut head = [0; 8];
+ let (head_size, head_ipv4) = read_groups(self, &mut head, 8);
+
+ if head_size == 8 {
+ return Some(Ipv6Addr::new(
+ head[0], head[1], head[2], head[3],
+ head[4], head[5], head[6], head[7]))
+ }
+
+ // IPv4 part is not allowed before `::`
+ if head_ipv4 {
+ return None
+ }
+
+ // read `::` if previous code parsed less than 8 groups
+ if !self.read_given_char(':').is_some() || !self.read_given_char(':').is_some() {
+ return None;
+ }
+
+ let mut tail = [0; 8];
+ let (tail_size, _) = read_groups(self, &mut tail, 8 - head_size);
+ Some(ipv6_addr_from_head_tail(&head[..head_size], &tail[..tail_size]))
+ }
+
+ fn read_ipv6_addr(&mut self) -> Option<Ipv6Addr> {
+ self.read_atomically(|p| p.read_ipv6_addr_impl())
+ }
+
+ /* Additions for IpNet below. */
+
+ // Read IPv4 network
+ fn read_ipv4_net(&mut self) -> Option<Ipv4Net> {
+ let ip_addr = |p: &mut Parser| p.read_ipv4_addr();
+ let slash = |p: &mut Parser| p.read_given_char('/');
+ let prefix_len = |p: &mut Parser| {
+ p.read_number(10, 2, 33).map(|n| n as u8)
+ };
+
+ self.read_seq_3(ip_addr, slash, prefix_len).map(|t| {
+ let (ip, _, prefix_len): (Ipv4Addr, char, u8) = t;
+ Ipv4Net::new(ip, prefix_len).unwrap()
+ })
+ }
+
+ // Read Ipv6 network
+ fn read_ipv6_net(&mut self) -> Option<Ipv6Net> {
+ let ip_addr = |p: &mut Parser| p.read_ipv6_addr();
+ let slash = |p: &mut Parser| p.read_given_char('/');
+ let prefix_len = |p: &mut Parser| {
+ p.read_number(10, 3, 129).map(|n| n as u8)
+ };
+
+ self.read_seq_3(ip_addr, slash, prefix_len).map(|t| {
+ let (ip, _, prefix_len): (Ipv6Addr, char, u8) = t;
+ Ipv6Net::new(ip, prefix_len).unwrap()
+ })
+ }
+
+ fn read_ip_net(&mut self) -> Option<IpNet> {
+ let ipv4_net = |p: &mut Parser| p.read_ipv4_net().map(IpNet::V4);
+ let ipv6_net = |p: &mut Parser| p.read_ipv6_net().map(IpNet::V6);
+ self.read_or(&mut [Box::new(ipv4_net), Box::new(ipv6_net)])
+ }
+
+ /* Additions for IpNet above. */
+}
+
+/* Additions for IpNet below. */
+
+impl FromStr for IpNet {
+ type Err = AddrParseError;
+ fn from_str(s: &str) -> Result<IpNet, AddrParseError> {
+ match Parser::new(s).read_till_eof(|p| p.read_ip_net()) {
+ Some(s) => Ok(s),
+ None => Err(AddrParseError(()))
+ }
+ }
+}
+
+impl FromStr for Ipv4Net {
+ type Err = AddrParseError;
+ fn from_str(s: &str) -> Result<Ipv4Net, AddrParseError> {
+ match Parser::new(s).read_till_eof(|p| p.read_ipv4_net()) {
+ Some(s) => Ok(s),
+ None => Err(AddrParseError(()))
+ }
+ }
+}
+
+impl FromStr for Ipv6Net {
+ type Err = AddrParseError;
+ fn from_str(s: &str) -> Result<Ipv6Net, AddrParseError> {
+ match Parser::new(s).read_till_eof(|p| p.read_ipv6_net()) {
+ Some(s) => Ok(s),
+ None => Err(AddrParseError(()))
+ }
+ }
+}
+
+/* Additions for IpNet above. */
+
+/// An error which can be returned when parsing an IP network address.
+///
+/// This error is used as the error type for the [`FromStr`] implementation for
+/// [`IpNet`], [`Ipv4Net`], and [`Ipv6Net`].
+///
+/// [`FromStr`]: https://doc.rust-lang.org/std/str/trait.FromStr.html
+/// [`IpNet`]: enum.IpNet.html
+/// [`Ipv4Net`]: struct.Ipv4Net.html
+/// [`Ipv6Net`]: struct.Ipv6Net.html
+#[derive(Debug, Clone, PartialEq, Eq)]
+pub struct AddrParseError(());
+
+impl fmt::Display for AddrParseError {
+ fn fmt(&self, fmt: &mut fmt::Formatter) -> fmt::Result {
+ fmt.write_str("invalid IP address syntax")
+ }
+}
+
+impl Error for AddrParseError {}
generated by cgit v1.2.3 (git 2.39.1) at 2024-12-27 00:26:36 +0000