1 /* 2 * Copyright (c) 2004 by Internet Systems Consortium, Inc. ("ISC") 3 * Copyright (c) 1996,1999 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 ISC DISCLAIMS ALL WARRANTIES 10 * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF 11 * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL ISC BE LIABLE FOR 12 * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES 13 * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN 14 * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT 15 * OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE. 16 * 17 * $Id: inet_pton.c,v 1.5 2005/07/28 06:51:47 marka Exp $ 18 */ 19 20 #include "port_before.h" 21 #include <sys/param.h> 22 #include <sys/types.h> 23 #include <sys/socket.h> 24 #include <netinet/in.h> 25 #include <arpa/inet.h> 26 #include <arpa/nameser.h> 27 #include <string.h> 28 #include <errno.h> 29 #include "port_after.h" 30 31 /*% 32 * WARNING: Don't even consider trying to compile this on a system where 33 * sizeof(int) < 4. sizeof(int) > 4 is fine; all the world's not a VAX. 34 */ 35 36 static int inet_pton4(const char *src, u_char *dst); 37 static int inet_pton6(const char *src, u_char *dst); 38 39 /* int 40 * inet_pton(af, src, dst) 41 * convert from presentation format (which usually means ASCII printable) 42 * to network format (which is usually some kind of binary format). 43 * return: 44 * 1 if the address was valid for the specified address family 45 * 0 if the address wasn't valid (`dst' is untouched in this case) 46 * -1 if some other error occurred (`dst' is untouched in this case, too) 47 * author: 48 * Paul Vixie, 1996. 49 */ 50 int 51 inet_pton(int af, const char * __restrict src, void * __restrict dst) 52 { 53 switch (af) { 54 case AF_INET: 55 return (inet_pton4(src, dst)); 56 case AF_INET6: 57 return (inet_pton6(src, dst)); 58 default: 59 errno = EAFNOSUPPORT; 60 return (-1); 61 } 62 /* NOTREACHED */ 63 } 64 65 /* int 66 * inet_pton4(src, dst) 67 * like inet_aton() but without all the hexadecimal and shorthand. 68 * return: 69 * 1 if `src' is a valid dotted quad, else 0. 70 * notice: 71 * does not touch `dst' unless it's returning 1. 72 * author: 73 * Paul Vixie, 1996. 74 */ 75 static int 76 inet_pton4(const char *src, u_char *dst) 77 { 78 static const char digits[] = "0123456789"; 79 int saw_digit, octets, ch; 80 u_char tmp[NS_INADDRSZ], *tp; 81 82 saw_digit = 0; 83 octets = 0; 84 *(tp = tmp) = 0; 85 while ((ch = *src++) != '\0') { 86 const char *pch; 87 88 if ((pch = strchr(digits, ch)) != NULL) { 89 u_int new = *tp * 10 + (pch - digits); 90 91 if (saw_digit && *tp == 0) 92 return (0); 93 if (new > 255) 94 return (0); 95 *tp = new; 96 if (!saw_digit) { 97 if (++octets > 4) 98 return (0); 99 saw_digit = 1; 100 } 101 } else if (ch == '.' && saw_digit) { 102 if (octets == 4) 103 return (0); 104 *++tp = 0; 105 saw_digit = 0; 106 } else 107 return (0); 108 } 109 if (octets < 4) 110 return (0); 111 memcpy(dst, tmp, NS_INADDRSZ); 112 return (1); 113 } 114 115 /* int 116 * inet_pton6(src, dst) 117 * convert presentation level address to network order binary form. 118 * return: 119 * 1 if `src' is a valid [RFC1884 2.2] address, else 0. 120 * notice: 121 * (1) does not touch `dst' unless it's returning 1. 122 * (2) :: in a full address is silently ignored. 123 * credit: 124 * inspired by Mark Andrews. 125 * author: 126 * Paul Vixie, 1996. 127 */ 128 static int 129 inet_pton6(const char *src, u_char *dst) 130 { 131 static const char xdigits_l[] = "0123456789abcdef", 132 xdigits_u[] = "0123456789ABCDEF"; 133 u_char tmp[NS_IN6ADDRSZ], *tp, *endp, *colonp; 134 const char *xdigits, *curtok; 135 int ch, seen_xdigits; 136 u_int val; 137 138 memset((tp = tmp), '\0', NS_IN6ADDRSZ); 139 endp = tp + NS_IN6ADDRSZ; 140 colonp = NULL; 141 /* Leading :: requires some special handling. */ 142 if (*src == ':') 143 if (*++src != ':') 144 return (0); 145 curtok = src; 146 seen_xdigits = 0; 147 val = 0; 148 while ((ch = *src++) != '\0') { 149 const char *pch; 150 151 if ((pch = strchr((xdigits = xdigits_l), ch)) == NULL) 152 pch = strchr((xdigits = xdigits_u), ch); 153 if (pch != NULL) { 154 val <<= 4; 155 val |= (pch - xdigits); 156 if (++seen_xdigits > 4) 157 return (0); 158 continue; 159 } 160 if (ch == ':') { 161 curtok = src; 162 if (!seen_xdigits) { 163 if (colonp) 164 return (0); 165 colonp = tp; 166 continue; 167 } else if (*src == '\0') { 168 return (0); 169 } 170 if (tp + NS_INT16SZ > endp) 171 return (0); 172 *tp++ = (u_char) (val >> 8) & 0xff; 173 *tp++ = (u_char) val & 0xff; 174 seen_xdigits = 0; 175 val = 0; 176 continue; 177 } 178 if (ch == '.' && ((tp + NS_INADDRSZ) <= endp) && 179 inet_pton4(curtok, tp) > 0) { 180 tp += NS_INADDRSZ; 181 seen_xdigits = 0; 182 break; /*%< '\\0' was seen by inet_pton4(). */ 183 } 184 return (0); 185 } 186 if (seen_xdigits) { 187 if (tp + NS_INT16SZ > endp) 188 return (0); 189 *tp++ = (u_char) (val >> 8) & 0xff; 190 *tp++ = (u_char) val & 0xff; 191 } 192 if (colonp != NULL) { 193 /* 194 * Since some memmove()'s erroneously fail to handle 195 * overlapping regions, we'll do the shift by hand. 196 */ 197 const int n = tp - colonp; 198 int i; 199 200 if (tp == endp) 201 return (0); 202 for (i = 1; i <= n; i++) { 203 endp[- i] = colonp[n - i]; 204 colonp[n - i] = 0; 205 } 206 tp = endp; 207 } 208 if (tp != endp) 209 return (0); 210 memcpy(dst, tmp, NS_IN6ADDRSZ); 211 return (1); 212 } 213 214 /* 215 * Weak aliases for applications that use certain private entry points, 216 * and fail to include <arpa/inet.h>. 217 */ 218 #undef inet_pton 219 __weak_reference(__inet_pton, inet_pton); 220