| 1 | /* inet_pton.c -- convert IPv4 and IPv6 addresses from text to binary form |
| 2 | |
| 3 | Copyright (C) 2006, 2008-2011 Free Software Foundation, Inc. |
| 4 | |
| 5 | This program is free software: you can redistribute it and/or modify |
| 6 | it under the terms of the GNU Lesser General Public License as published by |
| 7 | the Free Software Foundation; either version 3 of the License, or |
| 8 | (at your option) any later version. |
| 9 | |
| 10 | This program is distributed in the hope that it will be useful, |
| 11 | but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 12 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 13 | GNU Lesser General Public License for more details. |
| 14 | |
| 15 | You should have received a copy of the GNU Lesser General Public License |
| 16 | along with this program. If not, see <http://www.gnu.org/licenses/>. */ |
| 17 | |
| 18 | /* |
| 19 | * Copyright (c) 1996,1999 by Internet Software Consortium. |
| 20 | * |
| 21 | * Permission to use, copy, modify, and distribute this software for any |
| 22 | * purpose with or without fee is hereby granted, provided that the above |
| 23 | * copyright notice and this permission notice appear in all copies. |
| 24 | * |
| 25 | * THE SOFTWARE IS PROVIDED "AS IS" AND INTERNET SOFTWARE CONSORTIUM DISCLAIMS |
| 26 | * ALL WARRANTIES WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES |
| 27 | * OF MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL INTERNET SOFTWARE |
| 28 | * CONSORTIUM BE LIABLE FOR ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL |
| 29 | * DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR |
| 30 | * PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS |
| 31 | * ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS |
| 32 | * SOFTWARE. |
| 33 | */ |
| 34 | |
| 35 | #include <config.h> |
| 36 | |
| 37 | /* Specification. */ |
| 38 | #include <arpa/inet.h> |
| 39 | |
| 40 | #include <c-ctype.h> |
| 41 | #include <string.h> |
| 42 | #include <errno.h> |
| 43 | |
| 44 | #define NS_INADDRSZ 4 |
| 45 | #define NS_IN6ADDRSZ 16 |
| 46 | #define NS_INT16SZ 2 |
| 47 | |
| 48 | /* |
| 49 | * WARNING: Don't even consider trying to compile this on a system where |
| 50 | * sizeof(int) < 4. sizeof(int) > 4 is fine; all the world's not a VAX. |
| 51 | */ |
| 52 | |
| 53 | static int inet_pton4 (const char *src, unsigned char *dst); |
| 54 | #if HAVE_IPV6 |
| 55 | static int inet_pton6 (const char *src, unsigned char *dst); |
| 56 | #endif |
| 57 | |
| 58 | /* int |
| 59 | * inet_pton(af, src, dst) |
| 60 | * convert from presentation format (which usually means ASCII printable) |
| 61 | * to network format (which is usually some kind of binary format). |
| 62 | * return: |
| 63 | * 1 if the address was valid for the specified address family |
| 64 | * 0 if the address wasn't valid (`dst' is untouched in this case) |
| 65 | * -1 if some other error occurred (`dst' is untouched in this case, too) |
| 66 | * author: |
| 67 | * Paul Vixie, 1996. |
| 68 | */ |
| 69 | int |
| 70 | inet_pton (int af, const char *restrict src, void *restrict dst) |
| 71 | { |
| 72 | switch (af) |
| 73 | { |
| 74 | case AF_INET: |
| 75 | return (inet_pton4 (src, dst)); |
| 76 | |
| 77 | #if HAVE_IPV6 |
| 78 | case AF_INET6: |
| 79 | return (inet_pton6 (src, dst)); |
| 80 | #endif |
| 81 | |
| 82 | default: |
| 83 | errno = EAFNOSUPPORT; |
| 84 | return (-1); |
| 85 | } |
| 86 | /* NOTREACHED */ |
| 87 | } |
| 88 | |
| 89 | /* int |
| 90 | * inet_pton4(src, dst) |
| 91 | * like inet_aton() but without all the hexadecimal, octal (with the |
| 92 | * exception of 0) and shorthand. |
| 93 | * return: |
| 94 | * 1 if `src' is a valid dotted quad, else 0. |
| 95 | * notice: |
| 96 | * does not touch `dst' unless it's returning 1. |
| 97 | * author: |
| 98 | * Paul Vixie, 1996. |
| 99 | */ |
| 100 | static int |
| 101 | inet_pton4 (const char *restrict src, unsigned char *restrict dst) |
| 102 | { |
| 103 | int saw_digit, octets, ch; |
| 104 | unsigned char tmp[NS_INADDRSZ], *tp; |
| 105 | |
| 106 | saw_digit = 0; |
| 107 | octets = 0; |
| 108 | *(tp = tmp) = 0; |
| 109 | while ((ch = *src++) != '\0') |
| 110 | { |
| 111 | |
| 112 | if (ch >= '0' && ch <= '9') |
| 113 | { |
| 114 | unsigned new = *tp * 10 + (ch - '0'); |
| 115 | |
| 116 | if (saw_digit && *tp == 0) |
| 117 | return (0); |
| 118 | if (new > 255) |
| 119 | return (0); |
| 120 | *tp = new; |
| 121 | if (!saw_digit) |
| 122 | { |
| 123 | if (++octets > 4) |
| 124 | return (0); |
| 125 | saw_digit = 1; |
| 126 | } |
| 127 | } |
| 128 | else if (ch == '.' && saw_digit) |
| 129 | { |
| 130 | if (octets == 4) |
| 131 | return (0); |
| 132 | *++tp = 0; |
| 133 | saw_digit = 0; |
| 134 | } |
| 135 | else |
| 136 | return (0); |
| 137 | } |
| 138 | if (octets < 4) |
| 139 | return (0); |
| 140 | memcpy (dst, tmp, NS_INADDRSZ); |
| 141 | return (1); |
| 142 | } |
| 143 | |
| 144 | #if HAVE_IPV6 |
| 145 | |
| 146 | /* int |
| 147 | * inet_pton6(src, dst) |
| 148 | * convert presentation level address to network order binary form. |
| 149 | * return: |
| 150 | * 1 if `src' is a valid [RFC1884 2.2] address, else 0. |
| 151 | * notice: |
| 152 | * (1) does not touch `dst' unless it's returning 1. |
| 153 | * (2) :: in a full address is silently ignored. |
| 154 | * credit: |
| 155 | * inspired by Mark Andrews. |
| 156 | * author: |
| 157 | * Paul Vixie, 1996. |
| 158 | */ |
| 159 | static int |
| 160 | inet_pton6 (const char *restrict src, unsigned char *restrict dst) |
| 161 | { |
| 162 | static const char xdigits[] = "0123456789abcdef"; |
| 163 | unsigned char tmp[NS_IN6ADDRSZ], *tp, *endp, *colonp; |
| 164 | const char *curtok; |
| 165 | int ch, saw_xdigit; |
| 166 | unsigned val; |
| 167 | |
| 168 | tp = memset (tmp, '\0', NS_IN6ADDRSZ); |
| 169 | endp = tp + NS_IN6ADDRSZ; |
| 170 | colonp = NULL; |
| 171 | /* Leading :: requires some special handling. */ |
| 172 | if (*src == ':') |
| 173 | if (*++src != ':') |
| 174 | return (0); |
| 175 | curtok = src; |
| 176 | saw_xdigit = 0; |
| 177 | val = 0; |
| 178 | while ((ch = c_tolower (*src++)) != '\0') |
| 179 | { |
| 180 | const char *pch; |
| 181 | |
| 182 | pch = strchr (xdigits, ch); |
| 183 | if (pch != NULL) |
| 184 | { |
| 185 | val <<= 4; |
| 186 | val |= (pch - xdigits); |
| 187 | if (val > 0xffff) |
| 188 | return (0); |
| 189 | saw_xdigit = 1; |
| 190 | continue; |
| 191 | } |
| 192 | if (ch == ':') |
| 193 | { |
| 194 | curtok = src; |
| 195 | if (!saw_xdigit) |
| 196 | { |
| 197 | if (colonp) |
| 198 | return (0); |
| 199 | colonp = tp; |
| 200 | continue; |
| 201 | } |
| 202 | else if (*src == '\0') |
| 203 | { |
| 204 | return (0); |
| 205 | } |
| 206 | if (tp + NS_INT16SZ > endp) |
| 207 | return (0); |
| 208 | *tp++ = (u_char) (val >> 8) & 0xff; |
| 209 | *tp++ = (u_char) val & 0xff; |
| 210 | saw_xdigit = 0; |
| 211 | val = 0; |
| 212 | continue; |
| 213 | } |
| 214 | if (ch == '.' && ((tp + NS_INADDRSZ) <= endp) && |
| 215 | inet_pton4 (curtok, tp) > 0) |
| 216 | { |
| 217 | tp += NS_INADDRSZ; |
| 218 | saw_xdigit = 0; |
| 219 | break; /* '\0' was seen by inet_pton4(). */ |
| 220 | } |
| 221 | return (0); |
| 222 | } |
| 223 | if (saw_xdigit) |
| 224 | { |
| 225 | if (tp + NS_INT16SZ > endp) |
| 226 | return (0); |
| 227 | *tp++ = (u_char) (val >> 8) & 0xff; |
| 228 | *tp++ = (u_char) val & 0xff; |
| 229 | } |
| 230 | if (colonp != NULL) |
| 231 | { |
| 232 | /* |
| 233 | * Since some memmove()'s erroneously fail to handle |
| 234 | * overlapping regions, we'll do the shift by hand. |
| 235 | */ |
| 236 | const int n = tp - colonp; |
| 237 | int i; |
| 238 | |
| 239 | if (tp == endp) |
| 240 | return (0); |
| 241 | for (i = 1; i <= n; i++) |
| 242 | { |
| 243 | endp[-i] = colonp[n - i]; |
| 244 | colonp[n - i] = 0; |
| 245 | } |
| 246 | tp = endp; |
| 247 | } |
| 248 | if (tp != endp) |
| 249 | return (0); |
| 250 | memcpy (dst, tmp, NS_IN6ADDRSZ); |
| 251 | return (1); |
| 252 | } |
| 253 | #endif |