1/* This is from the BIND 4.9.4 release, modified to compile by itself */ 2 3/* Copyright (c) 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 * SPDX-License-Identifier: ISC 19 */ 20 21#include "curl_setup.h" 22 23#ifndef HAVE_INET_PTON 24 25#ifdef HAVE_SYS_PARAM_H 26#include <sys/param.h> 27#endif 28#ifdef HAVE_NETINET_IN_H 29#include <netinet/in.h> 30#endif 31#ifdef HAVE_ARPA_INET_H 32#include <arpa/inet.h> 33#endif 34 35#include "inet_pton.h" 36 37#define IN6ADDRSZ 16 38#define INADDRSZ 4 39#define INT16SZ 2 40 41/* 42 * If ENABLE_IPV6 is disabled, we still want to parse IPv6 addresses, so make 43 * sure we have _some_ value for AF_INET6 without polluting our fake value 44 * everywhere. 45 */ 46#if !defined(ENABLE_IPV6) && !defined(AF_INET6) 47#define AF_INET6 (AF_INET + 1) 48#endif 49 50/* 51 * WARNING: Don't even consider trying to compile this on a system where 52 * sizeof(int) < 4. sizeof(int) > 4 is fine; all the world's not a VAX. 53 */ 54 55static int inet_pton4(const char *src, unsigned char *dst); 56static int inet_pton6(const char *src, unsigned char *dst); 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 * notice: 67 * On Windows we store the error in the thread errno, not 68 * in the winsock error code. This is to avoid losing the 69 * actual last winsock error. So when this function returns 70 * -1, check errno not SOCKERRNO. 71 * author: 72 * Paul Vixie, 1996. 73 */ 74int 75Curl_inet_pton(int af, const char *src, void *dst) 76{ 77 switch(af) { 78 case AF_INET: 79 return (inet_pton4(src, (unsigned char *)dst)); 80 case AF_INET6: 81 return (inet_pton6(src, (unsigned char *)dst)); 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 and shorthand. 92 * return: 93 * 1 if `src' is a valid dotted quad, else 0. 94 * notice: 95 * does not touch `dst' unless it's returning 1. 96 * author: 97 * Paul Vixie, 1996. 98 */ 99static int 100inet_pton4(const char *src, unsigned char *dst) 101{ 102 static const char digits[] = "0123456789"; 103 int saw_digit, octets, ch; 104 unsigned char tmp[INADDRSZ], *tp; 105 106 saw_digit = 0; 107 octets = 0; 108 tp = tmp; 109 *tp = 0; 110 while((ch = *src++) != '\0') { 111 const char *pch; 112 113 pch = strchr(digits, ch); 114 if(pch) { 115 unsigned int val = (unsigned int)(*tp * 10) + 116 (unsigned int)(pch - digits); 117 118 if(saw_digit && *tp == 0) 119 return (0); 120 if(val > 255) 121 return (0); 122 *tp = (unsigned char)val; 123 if(!saw_digit) { 124 if(++octets > 4) 125 return (0); 126 saw_digit = 1; 127 } 128 } 129 else if(ch == '.' && saw_digit) { 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, INADDRSZ); 141 return (1); 142} 143 144/* int 145 * inet_pton6(src, dst) 146 * convert presentation level address to network order binary form. 147 * return: 148 * 1 if `src' is a valid [RFC1884 2.2] address, else 0. 149 * notice: 150 * (1) does not touch `dst' unless it's returning 1. 151 * (2) :: in a full address is silently ignored. 152 * credit: 153 * inspired by Mark Andrews. 154 * author: 155 * Paul Vixie, 1996. 156 */ 157static int 158inet_pton6(const char *src, unsigned char *dst) 159{ 160 static const char xdigits_l[] = "0123456789abcdef", 161 xdigits_u[] = "0123456789ABCDEF"; 162 unsigned char tmp[IN6ADDRSZ], *tp, *endp, *colonp; 163 const char *curtok; 164 int ch, saw_xdigit; 165 size_t val; 166 167 memset((tp = tmp), 0, IN6ADDRSZ); 168 endp = tp + IN6ADDRSZ; 169 colonp = NULL; 170 /* Leading :: requires some special handling. */ 171 if(*src == ':') 172 if(*++src != ':') 173 return (0); 174 curtok = src; 175 saw_xdigit = 0; 176 val = 0; 177 while((ch = *src++) != '\0') { 178 const char *xdigits; 179 const char *pch; 180 181 pch = strchr((xdigits = xdigits_l), ch); 182 if(!pch) 183 pch = strchr((xdigits = xdigits_u), ch); 184 if(pch) { 185 val <<= 4; 186 val |= (pch - xdigits); 187 if(++saw_xdigit > 4) 188 return (0); 189 continue; 190 } 191 if(ch == ':') { 192 curtok = src; 193 if(!saw_xdigit) { 194 if(colonp) 195 return (0); 196 colonp = tp; 197 continue; 198 } 199 if(tp + INT16SZ > endp) 200 return (0); 201 *tp++ = (unsigned char) ((val >> 8) & 0xff); 202 *tp++ = (unsigned char) (val & 0xff); 203 saw_xdigit = 0; 204 val = 0; 205 continue; 206 } 207 if(ch == '.' && ((tp + INADDRSZ) <= endp) && 208 inet_pton4(curtok, tp) > 0) { 209 tp += INADDRSZ; 210 saw_xdigit = 0; 211 break; /* '\0' was seen by inet_pton4(). */ 212 } 213 return (0); 214 } 215 if(saw_xdigit) { 216 if(tp + INT16SZ > endp) 217 return (0); 218 *tp++ = (unsigned char) ((val >> 8) & 0xff); 219 *tp++ = (unsigned char) (val & 0xff); 220 } 221 if(colonp) { 222 /* 223 * Since some memmove()'s erroneously fail to handle 224 * overlapping regions, we'll do the shift by hand. 225 */ 226 const ssize_t n = tp - colonp; 227 ssize_t i; 228 229 if(tp == endp) 230 return (0); 231 for(i = 1; i <= n; i++) { 232 *(endp - i) = *(colonp + n - i); 233 *(colonp + n - i) = 0; 234 } 235 tp = endp; 236 } 237 if(tp != endp) 238 return (0); 239 memcpy(dst, tmp, IN6ADDRSZ); 240 return (1); 241} 242 243#endif /* HAVE_INET_PTON */ 244