1/* 2 * Copyright (c) 1996,1999 by Internet Software Consortium. 3 * 4 * Permission to use, copy, modify, and distribute this software for any 5 * purpose with or without fee is hereby granted, provided that the above 6 * copyright notice and this permission notice appear in all copies. 7 * 8 * THE SOFTWARE IS PROVIDED "AS IS" AND INTERNET SOFTWARE CONSORTIUM DISCLAIMS 9 * ALL WARRANTIES WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES 10 * OF MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL INTERNET SOFTWARE 11 * CONSORTIUM BE LIABLE FOR ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL 12 * DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR 13 * PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS 14 * ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS 15 * SOFTWARE. 16 */ 17 18#if defined(LIBC_SCCS) && !defined(lint) 19static char rcsid[] = "$Id: inet_pton.c,v 1.3 2003/04/10 18:53:29 majka Exp $"; 20#endif /* LIBC_SCCS and not lint */ 21 22#ifdef HAVE_CONFIG_H 23#include <config.h> 24#endif 25 26#include <sys/param.h> 27#include <sys/types.h> 28#include <sys/socket.h> 29#include <netinet/in.h> 30#include <arpa/inet.h> 31#include <net/if.h> 32#include <arpa/nameser.h> 33#include <string.h> 34#include <stdlib.h> 35#include <errno.h> 36 37#define INET6 1 38 39#define IN6ADDRSZ 16 40 41#if 0 42#ifndef HAVE_PORTABLE_PROTOTYPE 43#include "cdecl_ext.h" 44#endif 45 46#ifndef HAVE_U_INT16_T 47#include "bittypes.h" 48#endif 49#if !(defined(HAVE_INADDRSZ) && defined(HAVE_IN6ADDRSZ)) 50#include "addrsize.h" 51#endif 52#endif 53#ifndef NS_INADDRSZ 54#define NS_INADDRSZ INADDRSZ 55#endif 56#ifndef NS_IN6ADDRSZ 57#define NS_IN6ADDRSZ IN6ADDRSZ 58#endif 59#ifndef NS_INT16SZ 60#define NS_INT16SZ sizeof(u_int16_t) 61#endif 62 63/* 64 * WARNING: Don't even consider trying to compile this on a system where 65 * sizeof(int) < 4. sizeof(int) > 4 is fine; all the world's not a VAX. 66 */ 67 68static int inet_pton4 __P((const char *src, u_char *dst)); 69#ifdef INET6 70static int inet_pton6 __P((const char *src, u_char *dst)); 71#endif 72 73/* int 74 * inet_pton(af, src, dst) 75 * convert from presentation format (which usually means ASCII printable) 76 * to network format (which is usually some kind of binary format). 77 * return: 78 * 1 if the address was valid for the specified address family 79 * 0 if the address wasn't valid (`dst' is untouched in this case) 80 * -1 if some other error occurred (`dst' is untouched in this case, too) 81 * author: 82 * Paul Vixie, 1996. 83 */ 84int 85inet_pton(int af, const char *src, void *dst) 86{ 87 int status; 88 unsigned short ifnum; 89 char *p, *s; 90 91 switch (af) 92 { 93 case AF_INET: 94 { 95 return (inet_pton4(src, dst)); 96 } 97 98#ifdef INET6 99 case AF_INET6: 100 { 101 ifnum = 0; 102 p = NULL; 103 s = (char *)src; 104 105 if (src != NULL) p = strrchr(src, '%'); 106 if (p != NULL) 107 { 108 s = strdup(src); 109 if (s == NULL) 110 { 111 errno = ENOMEM; 112 return -1; 113 } 114 115 s[p - src] = '\0'; 116 } 117 118 status = inet_pton6(s, dst); 119 if (p != NULL) free(s); 120 if (status != 1) return status; 121 122 if ((p != NULL) && IN6_IS_ADDR_LINKLOCAL((struct in6_addr *)dst)) 123 { 124 ifnum = if_nametoindex(++p); 125 ifnum = htons(ifnum); 126 ((struct in6_addr *)dst)->__u6_addr.__u6_addr16[1] = ifnum; 127 } 128 129 return 1; 130 } 131#endif 132 133 default: 134 { 135 errno = EAFNOSUPPORT; 136 return -1; 137 } 138 } 139 140 /* NOTREACHED */ 141 return -1; 142} 143 144/* int 145 * inet_pton4(src, dst) 146 * like inet_aton() but without all the hexadecimal and shorthand. 147 * return: 148 * 1 if `src' is a valid dotted quad, else 0. 149 * notice: 150 * does not touch `dst' unless it's returning 1. 151 * author: 152 * Paul Vixie, 1996. 153 */ 154static int 155inet_pton4(const char *src, u_char *dst) 156{ 157 static const char digits[] = "0123456789"; 158 int saw_digit, octets, ch; 159 u_char tmp[NS_INADDRSZ], *tp; 160 161 saw_digit = 0; 162 octets = 0; 163 *(tp = tmp) = 0; 164 while ((ch = *src++) != '\0') { 165 const char *pch; 166 167 if ((pch = strchr(digits, ch)) != NULL) { 168 u_int new = *tp * 10 + (pch - digits); 169 170 if (new > 255) 171 return (0); 172 *tp = new; 173 if (! saw_digit) { 174 if (++octets > 4) 175 return (0); 176 saw_digit = 1; 177 } 178 } else if (ch == '.' && saw_digit) { 179 if (octets == 4) 180 return (0); 181 *++tp = 0; 182 saw_digit = 0; 183 } else 184 return (0); 185 } 186 if (octets < 4) 187 return (0); 188 memcpy(dst, tmp, NS_INADDRSZ); 189 return (1); 190} 191 192#ifdef INET6 193/* int 194 * inet_pton6(src, dst) 195 * convert presentation level address to network order binary form. 196 * return: 197 * 1 if `src' is a valid [RFC1884 2.2] address, else 0. 198 * notice: 199 * (1) does not touch `dst' unless it's returning 1. 200 * (2) :: in a full address is silently ignored. 201 * credit: 202 * inspired by Mark Andrews. 203 * author: 204 * Paul Vixie, 1996. 205 */ 206static int 207inet_pton6(const char *src, u_char *dst) 208{ 209 static const char xdigits_l[] = "0123456789abcdef", 210 xdigits_u[] = "0123456789ABCDEF"; 211 u_char tmp[NS_IN6ADDRSZ], *tp, *endp, *colonp; 212 const char *xdigits, *curtok; 213 int ch, saw_xdigit; 214 u_int val; 215 216 memset((tp = tmp), '\0', NS_IN6ADDRSZ); 217 endp = tp + NS_IN6ADDRSZ; 218 colonp = NULL; 219 /* Leading :: requires some special handling. */ 220 if (*src == ':') 221 if (*++src != ':') 222 return (0); 223 curtok = src; 224 saw_xdigit = 0; 225 val = 0; 226 while ((ch = *src++) != '\0') { 227 const char *pch; 228 229 if ((pch = strchr((xdigits = xdigits_l), ch)) == NULL) 230 pch = strchr((xdigits = xdigits_u), ch); 231 if (pch != NULL) { 232 val <<= 4; 233 val |= (pch - xdigits); 234 if (val > 0xffff) 235 return (0); 236 saw_xdigit = 1; 237 continue; 238 } 239 if (ch == ':') { 240 curtok = src; 241 if (!saw_xdigit) { 242 if (colonp) 243 return (0); 244 colonp = tp; 245 continue; 246 } else if (*src == '\0') { 247 return (0); 248 } 249 if (tp + NS_INT16SZ > endp) 250 return (0); 251 *tp++ = (u_char) (val >> 8) & 0xff; 252 *tp++ = (u_char) val & 0xff; 253 saw_xdigit = 0; 254 val = 0; 255 continue; 256 } 257 if (ch == '.' && ((tp + NS_INADDRSZ) <= endp) && 258 inet_pton4(curtok, tp) > 0) { 259 tp += NS_INADDRSZ; 260 saw_xdigit = 0; 261 break; /* '\0' was seen by inet_pton4(). */ 262 } 263 return (0); 264 } 265 if (saw_xdigit) { 266 if (tp + NS_INT16SZ > endp) 267 return (0); 268 *tp++ = (u_char) (val >> 8) & 0xff; 269 *tp++ = (u_char) val & 0xff; 270 } 271 if (colonp != NULL) { 272 /* 273 * Since some memmove()'s erroneously fail to handle 274 * overlapping regions, we'll do the shift by hand. 275 */ 276 const int n = tp - colonp; 277 int i; 278 279 if (tp == endp) 280 return (0); 281 for (i = 1; i <= n; i++) { 282 endp[- i] = colonp[n - i]; 283 colonp[n - i] = 0; 284 } 285 tp = endp; 286 } 287 if (tp != endp) 288 return (0); 289 memcpy(dst, tmp, NS_IN6ADDRSZ); 290 return (1); 291} 292#endif /*INET6*/ 293