inet_pton.c (5980B)
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 #include "../curl_ctype.h" 23 #include "strparse.h" 24 25 #ifndef HAVE_INET_PTON 26 27 #ifdef HAVE_SYS_PARAM_H 28 #include <sys/param.h> 29 #endif 30 #ifdef HAVE_NETINET_IN_H 31 #include <netinet/in.h> 32 #endif 33 #ifdef HAVE_ARPA_INET_H 34 #include <arpa/inet.h> 35 #endif 36 37 #include "inet_pton.h" 38 39 #define IN6ADDRSZ 16 40 #define INADDRSZ 4 41 #define INT16SZ 2 42 43 /* 44 * If USE_IPV6 is disabled, we still want to parse IPv6 addresses, so make 45 * sure we have _some_ value for AF_INET6 without polluting our fake value 46 * everywhere. 47 */ 48 #if !defined(USE_IPV6) && !defined(AF_INET6) 49 #define AF_INET6 (AF_INET + 1) 50 #endif 51 52 /* 53 * WARNING: Do not even consider trying to compile this on a system where 54 * sizeof(int) < 4. sizeof(int) > 4 is fine; all the world's not a VAX. 55 */ 56 57 static int inet_pton4(const char *src, unsigned char *dst); 58 static int inet_pton6(const char *src, unsigned char *dst); 59 60 /* int 61 * inet_pton(af, src, dst) 62 * convert from presentation format (which usually means ASCII printable) 63 * to network format (which is usually some kind of binary format). 64 * return: 65 * 1 if the address was valid for the specified address family 66 * 0 if the address was not valid (`dst' is untouched in this case) 67 * -1 if some other error occurred (`dst' is untouched in this case, too) 68 * notice: 69 * On Windows we store the error in the thread errno, not 70 * in the Winsock error code. This is to avoid losing the 71 * actual last Winsock error. When this function returns 72 * -1, check errno not SOCKERRNO. 73 * author: 74 * Paul Vixie, 1996. 75 */ 76 int 77 curlx_inet_pton(int af, const char *src, void *dst) 78 { 79 switch(af) { 80 case AF_INET: 81 return inet_pton4(src, (unsigned char *)dst); 82 case AF_INET6: 83 return inet_pton6(src, (unsigned char *)dst); 84 default: 85 CURL_SETERRNO(SOCKEAFNOSUPPORT); 86 return -1; 87 } 88 /* NOTREACHED */ 89 } 90 91 /* int 92 * inet_pton4(src, dst) 93 * like inet_aton() but without all the hexadecimal and shorthand. 94 * return: 95 * 1 if `src' is a valid dotted quad, else 0. 96 * notice: 97 * does not touch `dst' unless it is returning 1. 98 * author: 99 * Paul Vixie, 1996. 100 */ 101 static int 102 inet_pton4(const char *src, unsigned char *dst) 103 { 104 int saw_digit, octets, ch; 105 unsigned char tmp[INADDRSZ], *tp; 106 107 saw_digit = 0; 108 octets = 0; 109 tp = tmp; 110 *tp = 0; 111 while((ch = *src++) != '\0') { 112 if(ISDIGIT(ch)) { 113 unsigned int val = (*tp * 10) + (ch - '0'); 114 115 if(saw_digit && *tp == 0) 116 return 0; 117 if(val > 255) 118 return 0; 119 *tp = (unsigned char)val; 120 if(!saw_digit) { 121 if(++octets > 4) 122 return 0; 123 saw_digit = 1; 124 } 125 } 126 else if(ch == '.' && saw_digit) { 127 if(octets == 4) 128 return 0; 129 *++tp = 0; 130 saw_digit = 0; 131 } 132 else 133 return 0; 134 } 135 if(octets < 4) 136 return 0; 137 memcpy(dst, tmp, INADDRSZ); 138 return 1; 139 } 140 141 /* 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 is 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 */ 154 static int 155 inet_pton6(const char *src, unsigned char *dst) 156 { 157 unsigned char tmp[IN6ADDRSZ], *tp, *endp, *colonp; 158 const char *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 if(ISXDIGIT(ch)) { 174 val <<= 4; 175 val |= Curl_hexval(ch); 176 if(++saw_xdigit > 4) 177 return 0; 178 continue; 179 } 180 if(ch == ':') { 181 curtok = src; 182 if(!saw_xdigit) { 183 if(colonp) 184 return 0; 185 colonp = tp; 186 continue; 187 } 188 if(tp + INT16SZ > endp) 189 return 0; 190 *tp++ = (unsigned char) ((val >> 8) & 0xff); 191 *tp++ = (unsigned char) (val & 0xff); 192 saw_xdigit = 0; 193 val = 0; 194 continue; 195 } 196 if(ch == '.' && ((tp + INADDRSZ) <= endp) && 197 inet_pton4(curtok, tp) > 0) { 198 tp += INADDRSZ; 199 saw_xdigit = 0; 200 break; /* '\0' was seen by inet_pton4(). */ 201 } 202 return 0; 203 } 204 if(saw_xdigit) { 205 if(tp + INT16SZ > endp) 206 return 0; 207 *tp++ = (unsigned char) ((val >> 8) & 0xff); 208 *tp++ = (unsigned char) (val & 0xff); 209 } 210 if(colonp) { 211 /* 212 * Since some memmove()'s erroneously fail to handle 213 * overlapping regions, we will do the shift by hand. 214 */ 215 const ssize_t n = tp - colonp; 216 ssize_t i; 217 218 if(tp == endp) 219 return 0; 220 for(i = 1; i <= n; i++) { 221 *(endp - i) = *(colonp + n - i); 222 *(colonp + n - i) = 0; 223 } 224 tp = endp; 225 } 226 if(tp != endp) 227 return 0; 228 memcpy(dst, tmp, IN6ADDRSZ); 229 return 1; 230 } 231 232 #endif /* HAVE_INET_PTON */