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 "curl_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_NETINET_IN_H 27 #include <netinet/in.h> 28 #endif 29 #ifdef HAVE_ARPA_INET_H 30 #include <arpa/inet.h> 31 #endif 32 33 #include "inet_pton.h" 34 35 #define IN6ADDRSZ 16 36 #define INADDRSZ 4 37 #define INT16SZ 2 38 39 /* 40 * WARNING: Don't even consider trying to compile this on a system where 41 * sizeof(int) < 4. sizeof(int) > 4 is fine; all the world's not a VAX. 42 */ 43 44 static int inet_pton4(const char *src, unsigned char *dst); 45 #ifdef ENABLE_IPV6 46 static int inet_pton6(const char *src, unsigned char *dst); 47 #endif 48 49 /* int 50 * inet_pton(af, src, dst) 51 * convert from presentation format (which usually means ASCII printable) 52 * to network format (which is usually some kind of binary format). 53 * return: 54 * 1 if the address was valid for the specified address family 55 * 0 if the address wasn't valid (`dst' is untouched in this case) 56 * -1 if some other error occurred (`dst' is untouched in this case, too) 57 * notice: 58 * On Windows we store the error in the thread errno, not 59 * in the winsock error code. This is to avoid losing the 60 * actual last winsock error. So when this function returns 61 * -1, check errno not SOCKERRNO. 62 * author: 63 * Paul Vixie, 1996. 64 */ 65 int 66 Curl_inet_pton(int af, const char *src, void *dst) 67 { 68 switch(af) { 69 case AF_INET: 70 return (inet_pton4(src, (unsigned char *)dst)); 71 #ifdef ENABLE_IPV6 72 case AF_INET6: 73 return (inet_pton6(src, (unsigned char *)dst)); 74 #endif 75 default: 76 errno = EAFNOSUPPORT; 77 return (-1); 78 } 79 /* NOTREACHED */ 80 } 81 82 /* int 83 * inet_pton4(src, dst) 84 * like inet_aton() but without all the hexadecimal and shorthand. 85 * return: 86 * 1 if `src' is a valid dotted quad, else 0. 87 * notice: 88 * does not touch `dst' unless it's returning 1. 89 * author: 90 * Paul Vixie, 1996. 91 */ 92 static int 93 inet_pton4(const char *src, unsigned char *dst) 94 { 95 static const char digits[] = "0123456789"; 96 int saw_digit, octets, ch; 97 unsigned char tmp[INADDRSZ], *tp; 98 99 saw_digit = 0; 100 octets = 0; 101 tp = tmp; 102 *tp = 0; 103 while((ch = *src++) != '\0') { 104 const char *pch; 105 106 pch = strchr(digits, ch); 107 if(pch) { 108 unsigned int val = *tp * 10 + (unsigned int)(pch - digits); 109 110 if(saw_digit && *tp == 0) 111 return (0); 112 if(val > 255) 113 return (0); 114 *tp = (unsigned char)val; 115 if(! saw_digit) { 116 if(++octets > 4) 117 return (0); 118 saw_digit = 1; 119 } 120 } 121 else if(ch == '.' && saw_digit) { 122 if(octets == 4) 123 return (0); 124 *++tp = 0; 125 saw_digit = 0; 126 } 127 else 128 return (0); 129 } 130 if(octets < 4) 131 return (0); 132 memcpy(dst, tmp, INADDRSZ); 133 return (1); 134 } 135 136 #ifdef ENABLE_IPV6 137 /* int 138 * inet_pton6(src, dst) 139 * convert presentation level address to network order binary form. 140 * return: 141 * 1 if `src' is a valid [RFC1884 2.2] address, else 0. 142 * notice: 143 * (1) does not touch `dst' unless it's returning 1. 144 * (2) :: in a full address is silently ignored. 145 * credit: 146 * inspired by Mark Andrews. 147 * author: 148 * Paul Vixie, 1996. 149 */ 150 static int 151 inet_pton6(const char *src, unsigned char *dst) 152 { 153 static const char xdigits_l[] = "0123456789abcdef", 154 xdigits_u[] = "0123456789ABCDEF"; 155 unsigned char tmp[IN6ADDRSZ], *tp, *endp, *colonp; 156 const char *xdigits, *curtok; 157 int ch, saw_xdigit; 158 size_t val; 159 160 memset((tp = tmp), 0, IN6ADDRSZ); 161 endp = tp + IN6ADDRSZ; 162 colonp = NULL; 163 /* Leading :: requires some special handling. */ 164 if(*src == ':') 165 if(*++src != ':') 166 return (0); 167 curtok = src; 168 saw_xdigit = 0; 169 val = 0; 170 while((ch = *src++) != '\0') { 171 const char *pch; 172 173 pch = strchr((xdigits = xdigits_l), ch); 174 if(!pch) 175 pch = strchr((xdigits = xdigits_u), ch); 176 if(pch != NULL) { 177 val <<= 4; 178 val |= (pch - xdigits); 179 if(++saw_xdigit > 4) 180 return (0); 181 continue; 182 } 183 if(ch == ':') { 184 curtok = src; 185 if(!saw_xdigit) { 186 if(colonp) 187 return (0); 188 colonp = tp; 189 continue; 190 } 191 if(tp + INT16SZ > endp) 192 return (0); 193 *tp++ = (unsigned char) ((val >> 8) & 0xff); 194 *tp++ = (unsigned char) (val & 0xff); 195 saw_xdigit = 0; 196 val = 0; 197 continue; 198 } 199 if(ch == '.' && ((tp + INADDRSZ) <= endp) && 200 inet_pton4(curtok, tp) > 0) { 201 tp += INADDRSZ; 202 saw_xdigit = 0; 203 break; /* '\0' was seen by inet_pton4(). */ 204 } 205 return (0); 206 } 207 if(saw_xdigit) { 208 if(tp + INT16SZ > endp) 209 return (0); 210 *tp++ = (unsigned char) ((val >> 8) & 0xff); 211 *tp++ = (unsigned char) (val & 0xff); 212 } 213 if(colonp != NULL) { 214 /* 215 * Since some memmove()'s erroneously fail to handle 216 * overlapping regions, we'll do the shift by hand. 217 */ 218 const ssize_t n = tp - colonp; 219 ssize_t i; 220 221 if(tp == endp) 222 return (0); 223 for(i = 1; i <= n; i++) { 224 *(endp - i) = *(colonp + n - i); 225 *(colonp + n - i) = 0; 226 } 227 tp = endp; 228 } 229 if(tp != endp) 230 return (0); 231 memcpy(dst, tmp, IN6ADDRSZ); 232 return (1); 233 } 234 #endif /* ENABLE_IPV6 */ 235 236 #endif /* HAVE_INET_PTON */ 237
