| /* Copyright (C) 1996-2018 Free Software Foundation, Inc. |
| This file is part of the GNU C Library. |
| |
| The GNU C Library is free software; you can redistribute it and/or |
| modify it under the terms of the GNU Lesser General Public |
| License as published by the Free Software Foundation; either |
| version 2.1 of the License, or (at your option) any later version. |
| |
| The GNU C Library is distributed in the hope that it will be useful, |
| but WITHOUT ANY WARRANTY; without even the implied warranty of |
| MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
| Lesser General Public License for more details. |
| |
| You should have received a copy of the GNU Lesser General Public |
| License along with the GNU C Library; if not, see |
| <http://www.gnu.org/licenses/>. */ |
| |
| /* |
| * Copyright (c) 1996,1999 by Internet Software Consortium. |
| * |
| * Permission to use, copy, modify, and distribute this software for any |
| * purpose with or without fee is hereby granted, provided that the above |
| * copyright notice and this permission notice appear in all copies. |
| * |
| * THE SOFTWARE IS PROVIDED "AS IS" AND INTERNET SOFTWARE CONSORTIUM DISCLAIMS |
| * ALL WARRANTIES WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES |
| * OF MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL INTERNET SOFTWARE |
| * CONSORTIUM BE LIABLE FOR ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL |
| * DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR |
| * PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS |
| * ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS |
| * SOFTWARE. |
| */ |
| |
| #include <arpa/inet.h> |
| #include <arpa/nameser.h> |
| #include <ctype.h> |
| #include <errno.h> |
| #include <netinet/in.h> |
| #include <resolv/resolv-internal.h> |
| #include <string.h> |
| #include <sys/socket.h> |
| #include <sys/types.h> |
| |
| static int inet_pton4 (const char *src, const char *src_end, u_char *dst); |
| static int inet_pton6 (const char *src, const char *src_end, u_char *dst); |
| |
| int |
| __inet_pton_length (int af, const char *src, size_t srclen, void *dst) |
| { |
| switch (af) |
| { |
| case AF_INET: |
| return inet_pton4 (src, src + srclen, dst); |
| case AF_INET6: |
| return inet_pton6 (src, src + srclen, dst); |
| default: |
| __set_errno (EAFNOSUPPORT); |
| return -1; |
| } |
| } |
| libc_hidden_def (__inet_pton_length) |
| |
| /* Like __inet_pton_length, but use strlen (SRC) as the length of |
| SRC. */ |
| int |
| __inet_pton (int af, const char *src, void *dst) |
| { |
| return __inet_pton_length (af, src, strlen (src), dst); |
| } |
| libc_hidden_def (__inet_pton) |
| weak_alias (__inet_pton, inet_pton) |
| libc_hidden_weak (inet_pton) |
| |
| /* Like inet_aton but without all the hexadecimal, octal and shorthand |
| (and trailing garbage is not ignored). Return 1 if SRC is a valid |
| dotted quad, else 0. This function does not touch DST unless it's |
| returning 1. |
| Author: Paul Vixie, 1996. */ |
| static int |
| inet_pton4 (const char *src, const char *end, unsigned char *dst) |
| { |
| int saw_digit, octets, ch; |
| unsigned char tmp[NS_INADDRSZ], *tp; |
| |
| saw_digit = 0; |
| octets = 0; |
| *(tp = tmp) = 0; |
| while (src < end) |
| { |
| ch = *src++; |
| if (ch >= '0' && ch <= '9') |
| { |
| unsigned int new = *tp * 10 + (ch - '0'); |
| |
| if (saw_digit && *tp == 0) |
| return 0; |
| if (new > 255) |
| return 0; |
| *tp = new; |
| if (! saw_digit) |
| { |
| if (++octets > 4) |
| return 0; |
| saw_digit = 1; |
| } |
| } |
| else if (ch == '.' && saw_digit) |
| { |
| if (octets == 4) |
| return 0; |
| *++tp = 0; |
| saw_digit = 0; |
| } |
| else |
| return 0; |
| } |
| if (octets < 4) |
| return 0; |
| memcpy (dst, tmp, NS_INADDRSZ); |
| return 1; |
| } |
| |
| /* Return the value of CH as a hexademical digit, or -1 if it is a |
| different type of character. */ |
| static int |
| hex_digit_value (char ch) |
| { |
| if ('0' <= ch && ch <= '9') |
| return ch - '0'; |
| if ('a' <= ch && ch <= 'f') |
| return ch - 'a' + 10; |
| if ('A' <= ch && ch <= 'F') |
| return ch - 'A' + 10; |
| return -1; |
| } |
| |
| /* Convert presentation-level IPv6 address to network order binary |
| form. Return 1 if SRC is a valid [RFC1884 2.2] address, else 0. |
| This function does not touch DST unless it's returning 1. |
| Author: Paul Vixie, 1996. Inspired by Mark Andrews. */ |
| static int |
| inet_pton6 (const char *src, const char *src_endp, unsigned char *dst) |
| { |
| unsigned char tmp[NS_IN6ADDRSZ], *tp, *endp, *colonp; |
| const char *curtok; |
| int ch; |
| size_t xdigits_seen; /* Number of hex digits since colon. */ |
| unsigned int val; |
| |
| tp = memset (tmp, '\0', NS_IN6ADDRSZ); |
| endp = tp + NS_IN6ADDRSZ; |
| colonp = NULL; |
| |
| /* Leading :: requires some special handling. */ |
| if (src == src_endp) |
| return 0; |
| if (*src == ':') |
| { |
| ++src; |
| if (src == src_endp || *src != ':') |
| return 0; |
| } |
| |
| curtok = src; |
| xdigits_seen = 0; |
| val = 0; |
| while (src < src_endp) |
| { |
| ch = *src++; |
| int digit = hex_digit_value (ch); |
| if (digit >= 0) |
| { |
| if (xdigits_seen == 4) |
| return 0; |
| val <<= 4; |
| val |= digit; |
| if (val > 0xffff) |
| return 0; |
| ++xdigits_seen; |
| continue; |
| } |
| if (ch == ':') |
| { |
| curtok = src; |
| if (xdigits_seen == 0) |
| { |
| if (colonp) |
| return 0; |
| colonp = tp; |
| continue; |
| } |
| else if (src == src_endp) |
| return 0; |
| if (tp + NS_INT16SZ > endp) |
| return 0; |
| *tp++ = (unsigned char) (val >> 8) & 0xff; |
| *tp++ = (unsigned char) val & 0xff; |
| xdigits_seen = 0; |
| val = 0; |
| continue; |
| } |
| if (ch == '.' && ((tp + NS_INADDRSZ) <= endp) |
| && inet_pton4 (curtok, src_endp, tp) > 0) |
| { |
| tp += NS_INADDRSZ; |
| xdigits_seen = 0; |
| break; /* '\0' was seen by inet_pton4. */ |
| } |
| return 0; |
| } |
| if (xdigits_seen > 0) |
| { |
| if (tp + NS_INT16SZ > endp) |
| return 0; |
| *tp++ = (unsigned char) (val >> 8) & 0xff; |
| *tp++ = (unsigned char) val & 0xff; |
| } |
| if (colonp != NULL) |
| { |
| /* Replace :: with zeros. */ |
| if (tp == endp) |
| /* :: would expand to a zero-width field. */ |
| return 0; |
| size_t n = tp - colonp; |
| memmove (endp - n, colonp, n); |
| memset (colonp, 0, endp - n - colonp); |
| tp = endp; |
| } |
| if (tp != endp) |
| return 0; |
| memcpy (dst, tmp, NS_IN6ADDRSZ); |
| return 1; |
| } |
