1/* This is from the BIND 4.9.4 release, modified to compile by itself */ 2 3/* Copyright (c) 1996 by Internet Software Consortium. 4 * 5 * Permission to use, copy, modify, and distribute this software for any 6 * purpose with or without fee is hereby granted, provided that the above 7 * copyright notice and this permission notice appear in all copies. 8 * 9 * THE SOFTWARE IS PROVIDED "AS IS" AND INTERNET SOFTWARE CONSORTIUM DISCLAIMS 10 * ALL WARRANTIES WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES 11 * OF MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL INTERNET SOFTWARE 12 * CONSORTIUM BE LIABLE FOR ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL 13 * DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR 14 * PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS 15 * ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS 16 * SOFTWARE. 17 */ 18 19#include "setup.h" 20 21#ifndef HAVE_INET_PTON 22 23#ifdef HAVE_SYS_PARAM_H 24#include <sys/param.h> 25#endif 26#ifdef HAVE_SYS_SOCKET_H 27#include <sys/socket.h> 28#endif 29#ifdef HAVE_NETINET_IN_H 30#include <netinet/in.h> 31#endif 32#ifdef HAVE_ARPA_INET_H 33#include <arpa/inet.h> 34#endif 35 36#include "inet_pton.h" 37 38#define IN6ADDRSZ 16 39#define INADDRSZ 4 40#define INT16SZ 2 41 42/* 43 * WARNING: Don't even consider trying to compile this on a system where 44 * sizeof(int) < 4. sizeof(int) > 4 is fine; all the world's not a VAX. 45 */ 46 47static int inet_pton4(const char *src, unsigned char *dst); 48#ifdef ENABLE_IPV6 49static int inet_pton6(const char *src, unsigned char *dst); 50#endif 51 52/* int 53 * inet_pton(af, src, dst) 54 * convert from presentation format (which usually means ASCII printable) 55 * to network format (which is usually some kind of binary format). 56 * return: 57 * 1 if the address was valid for the specified address family 58 * 0 if the address wasn't valid (`dst' is untouched in this case) 59 * -1 if some other error occurred (`dst' is untouched in this case, too) 60 * notice: 61 * On Windows we store the error in the thread errno, not 62 * in the winsock error code. This is to avoid losing the 63 * actual last winsock error. So use macro ERRNO to fetch the 64 * errno this function sets when returning (-1), not SOCKERRNO. 65 * author: 66 * Paul Vixie, 1996. 67 */ 68int 69Curl_inet_pton(int af, const char *src, void *dst) 70{ 71 switch (af) { 72 case AF_INET: 73 return (inet_pton4(src, (unsigned char *)dst)); 74#ifdef ENABLE_IPV6 75 case AF_INET6: 76 return (inet_pton6(src, (unsigned char *)dst)); 77#endif 78 default: 79 SET_ERRNO(EAFNOSUPPORT); 80 return (-1); 81 } 82 /* NOTREACHED */ 83} 84 85/* int 86 * inet_pton4(src, dst) 87 * like inet_aton() but without all the hexadecimal and shorthand. 88 * return: 89 * 1 if `src' is a valid dotted quad, else 0. 90 * notice: 91 * does not touch `dst' unless it's returning 1. 92 * author: 93 * Paul Vixie, 1996. 94 */ 95static int 96inet_pton4(const char *src, unsigned char *dst) 97{ 98 static const char digits[] = "0123456789"; 99 int saw_digit, octets, ch; 100 unsigned char tmp[INADDRSZ], *tp; 101 102 saw_digit = 0; 103 octets = 0; 104 tp = tmp; 105 *tp = 0; 106 while((ch = *src++) != '\0') { 107 const char *pch; 108 109 if((pch = strchr(digits, ch)) != NULL) { 110 unsigned int val = *tp * 10 + (unsigned int)(pch - digits); 111 112 if(saw_digit && *tp == 0) 113 return (0); 114 if(val > 255) 115 return (0); 116 *tp = (unsigned char)val; 117 if(! saw_digit) { 118 if(++octets > 4) 119 return (0); 120 saw_digit = 1; 121 } 122 } 123 else if(ch == '.' && saw_digit) { 124 if(octets == 4) 125 return (0); 126 *++tp = 0; 127 saw_digit = 0; 128 } 129 else 130 return (0); 131 } 132 if(octets < 4) 133 return (0); 134 memcpy(dst, tmp, INADDRSZ); 135 return (1); 136} 137 138#ifdef ENABLE_IPV6 139/* int 140 * inet_pton6(src, dst) 141 * convert presentation level address to network order binary form. 142 * return: 143 * 1 if `src' is a valid [RFC1884 2.2] address, else 0. 144 * notice: 145 * (1) does not touch `dst' unless it's returning 1. 146 * (2) :: in a full address is silently ignored. 147 * credit: 148 * inspired by Mark Andrews. 149 * author: 150 * Paul Vixie, 1996. 151 */ 152static int 153inet_pton6(const char *src, unsigned char *dst) 154{ 155 static const char xdigits_l[] = "0123456789abcdef", 156 xdigits_u[] = "0123456789ABCDEF"; 157 unsigned char tmp[IN6ADDRSZ], *tp, *endp, *colonp; 158 const char *xdigits, *curtok; 159 int ch, saw_xdigit; 160 size_t val; 161 162 memset((tp = tmp), 0, IN6ADDRSZ); 163 endp = tp + IN6ADDRSZ; 164 colonp = NULL; 165 /* Leading :: requires some special handling. */ 166 if(*src == ':') 167 if(*++src != ':') 168 return (0); 169 curtok = src; 170 saw_xdigit = 0; 171 val = 0; 172 while((ch = *src++) != '\0') { 173 const char *pch; 174 175 if((pch = strchr((xdigits = xdigits_l), ch)) == NULL) 176 pch = strchr((xdigits = xdigits_u), ch); 177 if(pch != NULL) { 178 val <<= 4; 179 val |= (pch - xdigits); 180 if(++saw_xdigit > 4) 181 return (0); 182 continue; 183 } 184 if(ch == ':') { 185 curtok = src; 186 if(!saw_xdigit) { 187 if(colonp) 188 return (0); 189 colonp = tp; 190 continue; 191 } 192 if(tp + INT16SZ > endp) 193 return (0); 194 *tp++ = (unsigned char) (val >> 8) & 0xff; 195 *tp++ = (unsigned char) val & 0xff; 196 saw_xdigit = 0; 197 val = 0; 198 continue; 199 } 200 if(ch == '.' && ((tp + INADDRSZ) <= endp) && 201 inet_pton4(curtok, tp) > 0) { 202 tp += INADDRSZ; 203 saw_xdigit = 0; 204 break; /* '\0' was seen by inet_pton4(). */ 205 } 206 return (0); 207 } 208 if(saw_xdigit) { 209 if(tp + INT16SZ > endp) 210 return (0); 211 *tp++ = (unsigned char) (val >> 8) & 0xff; 212 *tp++ = (unsigned char) val & 0xff; 213 } 214 if(colonp != NULL) { 215 /* 216 * Since some memmove()'s erroneously fail to handle 217 * overlapping regions, we'll do the shift by hand. 218 */ 219 const ssize_t n = tp - colonp; 220 ssize_t i; 221 222 if(tp == endp) 223 return (0); 224 for(i = 1; i <= n; i++) { 225 *(endp - i) = *(colonp + n - i); 226 *(colonp + n - i) = 0; 227 } 228 tp = endp; 229 } 230 if(tp != endp) 231 return (0); 232 memcpy(dst, tmp, IN6ADDRSZ); 233 return (1); 234} 235#endif /* ENABLE_IPV6 */ 236 237#endif /* HAVE_INET_PTON */ 238