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#include <string.h> 36#include <errno.h> 37 38#include "inet_pton.h" 39 40#define IN6ADDRSZ 16 41#define INADDRSZ 4 42#define INT16SZ 2 43 44/* 45 * WARNING: Don't even consider trying to compile this on a system where 46 * sizeof(int) < 4. sizeof(int) > 4 is fine; all the world's not a VAX. 47 */ 48 49static int inet_pton4(const char *src, unsigned char *dst); 50#ifdef ENABLE_IPV6 51static int inet_pton6(const char *src, unsigned char *dst); 52#endif 53 54/* int 55 * inet_pton(af, src, dst) 56 * convert from presentation format (which usually means ASCII printable) 57 * to network format (which is usually some kind of binary format). 58 * return: 59 * 1 if the address was valid for the specified address family 60 * 0 if the address wasn't valid (`dst' is untouched in this case) 61 * -1 if some other error occurred (`dst' is untouched in this case, too) 62 * notice: 63 * On Windows we store the error in the thread errno, not 64 * in the winsock error code. This is to avoid losing the 65 * actual last winsock error. So use macro ERRNO to fetch the 66 * errno this function sets when returning (-1), not SOCKERRNO. 67 * author: 68 * Paul Vixie, 1996. 69 */ 70int 71Curl_inet_pton(int af, const char *src, void *dst) 72{ 73 switch (af) { 74 case AF_INET: 75 return (inet_pton4(src, (unsigned char *)dst)); 76#ifdef ENABLE_IPV6 77 case AF_INET6: 78 return (inet_pton6(src, (unsigned char *)dst)); 79#endif 80 default: 81 SET_ERRNO(EAFNOSUPPORT); 82 return (-1); 83 } 84 /* NOTREACHED */ 85} 86 87/* int 88 * inet_pton4(src, dst) 89 * like inet_aton() but without all the hexadecimal and shorthand. 90 * return: 91 * 1 if `src' is a valid dotted quad, else 0. 92 * notice: 93 * does not touch `dst' unless it's returning 1. 94 * author: 95 * Paul Vixie, 1996. 96 */ 97static int 98inet_pton4(const char *src, unsigned char *dst) 99{ 100 static const char digits[] = "0123456789"; 101 int saw_digit, octets, ch; 102 unsigned char tmp[INADDRSZ], *tp; 103 104 saw_digit = 0; 105 octets = 0; 106 tp = tmp; 107 *tp = 0; 108 while((ch = *src++) != '\0') { 109 const char *pch; 110 111 if((pch = strchr(digits, ch)) != NULL) { 112 unsigned int val = *tp * 10 + (unsigned int)(pch - digits); 113 114 if(saw_digit && *tp == 0) 115 return (0); 116 if(val > 255) 117 return (0); 118 *tp = (unsigned char)val; 119 if(! saw_digit) { 120 if(++octets > 4) 121 return (0); 122 saw_digit = 1; 123 } 124 } 125 else if(ch == '.' && saw_digit) { 126 if(octets == 4) 127 return (0); 128 *++tp = 0; 129 saw_digit = 0; 130 } 131 else 132 return (0); 133 } 134 if(octets < 4) 135 return (0); 136 memcpy(dst, tmp, INADDRSZ); 137 return (1); 138} 139 140#ifdef ENABLE_IPV6 141/* int 142 * inet_pton6(src, dst) 143 * convert presentation level address to network order binary form. 144 * return: 145 * 1 if `src' is a valid [RFC1884 2.2] address, else 0. 146 * notice: 147 * (1) does not touch `dst' unless it's returning 1. 148 * (2) :: in a full address is silently ignored. 149 * credit: 150 * inspired by Mark Andrews. 151 * author: 152 * Paul Vixie, 1996. 153 */ 154static int 155inet_pton6(const char *src, unsigned char *dst) 156{ 157 static const char xdigits_l[] = "0123456789abcdef", 158 xdigits_u[] = "0123456789ABCDEF"; 159 unsigned char tmp[IN6ADDRSZ], *tp, *endp, *colonp; 160 const char *xdigits, *curtok; 161 int ch, saw_xdigit; 162 size_t val; 163 164 memset((tp = tmp), 0, IN6ADDRSZ); 165 endp = tp + IN6ADDRSZ; 166 colonp = NULL; 167 /* Leading :: requires some special handling. */ 168 if(*src == ':') 169 if(*++src != ':') 170 return (0); 171 curtok = src; 172 saw_xdigit = 0; 173 val = 0; 174 while((ch = *src++) != '\0') { 175 const char *pch; 176 177 if((pch = strchr((xdigits = xdigits_l), ch)) == NULL) 178 pch = strchr((xdigits = xdigits_u), ch); 179 if(pch != NULL) { 180 val <<= 4; 181 val |= (pch - xdigits); 182 if(++saw_xdigit > 4) 183 return (0); 184 continue; 185 } 186 if(ch == ':') { 187 curtok = src; 188 if(!saw_xdigit) { 189 if(colonp) 190 return (0); 191 colonp = tp; 192 continue; 193 } 194 if(tp + INT16SZ > endp) 195 return (0); 196 *tp++ = (unsigned char) (val >> 8) & 0xff; 197 *tp++ = (unsigned char) val & 0xff; 198 saw_xdigit = 0; 199 val = 0; 200 continue; 201 } 202 if(ch == '.' && ((tp + INADDRSZ) <= endp) && 203 inet_pton4(curtok, tp) > 0) { 204 tp += INADDRSZ; 205 saw_xdigit = 0; 206 break; /* '\0' was seen by inet_pton4(). */ 207 } 208 return (0); 209 } 210 if(saw_xdigit) { 211 if(tp + INT16SZ > endp) 212 return (0); 213 *tp++ = (unsigned char) (val >> 8) & 0xff; 214 *tp++ = (unsigned char) val & 0xff; 215 } 216 if(colonp != NULL) { 217 /* 218 * Since some memmove()'s erroneously fail to handle 219 * overlapping regions, we'll do the shift by hand. 220 */ 221 const ssize_t n = tp - colonp; 222 ssize_t i; 223 224 if(tp == endp) 225 return (0); 226 for(i = 1; i <= n; i++) { 227 *(endp - i) = *(colonp + n - i); 228 *(colonp + n - i) = 0; 229 } 230 tp = endp; 231 } 232 if(tp != endp) 233 return (0); 234 memcpy(dst, tmp, IN6ADDRSZ); 235 return (1); 236} 237#endif /* ENABLE_IPV6 */ 238 239#endif /* HAVE_INET_PTON */ 240