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 18#if defined(LIBC_SCCS) && !defined(lint) 19static const char rcsid[] = "$Id: inet_pton.c,v 1.5 2005/07/28 06:51:47 marka Exp $"; 20#endif /* LIBC_SCCS and not lint */ 21 22#include "port_before.h" 23#include <sys/param.h> 24#include <sys/types.h> 25#include <sys/socket.h> 26#include <netinet/in.h> 27#include <arpa/inet.h> 28#include <arpa/nameser.h> 29#include <string.h> 30#include <errno.h> 31#include "port_after.h" 32 33/*% 34 * WARNING: Don't even consider trying to compile this on a system where 35 * sizeof(int) < 4. sizeof(int) > 4 is fine; all the world's not a VAX. 36 */ 37 38static int inet_pton4 __P((const char *src, u_char *dst)); 39static int inet_pton6 __P((const char *src, u_char *dst)); 40 41/* int 42 * inet_pton(af, src, dst) 43 * convert from presentation format (which usually means ASCII printable) 44 * to network format (which is usually some kind of binary format). 45 * return: 46 * 1 if the address was valid for the specified address family 47 * 0 if the address wasn't valid (`dst' is untouched in this case) 48 * -1 if some other error occurred (`dst' is untouched in this case, too) 49 * author: 50 * Paul Vixie, 1996. 51 */ 52int 53inet_pton(af, src, dst) 54 int af; 55 const char *src; 56 void *dst; 57{ 58 switch (af) { 59 case AF_INET: 60 return (inet_pton4(src, dst)); 61 case AF_INET6: 62 return (inet_pton6(src, dst)); 63 default: 64 errno = EAFNOSUPPORT; 65 return (-1); 66 } 67 /* NOTREACHED */ 68} 69 70/* int 71 * inet_pton4(src, dst) 72 * like inet_aton() but without all the hexadecimal and shorthand. 73 * return: 74 * 1 if `src' is a valid dotted quad, else 0. 75 * notice: 76 * does not touch `dst' unless it's returning 1. 77 * author: 78 * Paul Vixie, 1996. 79 */ 80static int 81inet_pton4(src, dst) 82 const char *src; 83 u_char *dst; 84{ 85 static const char digits[] = "0123456789"; 86 int saw_digit, octets, ch; 87 u_char tmp[NS_INADDRSZ], *tp; 88 89 saw_digit = 0; 90 octets = 0; 91 *(tp = tmp) = 0; 92 while ((ch = *src++) != '\0') { 93 const char *pch; 94 95 if ((pch = strchr(digits, ch)) != NULL) { 96 u_int new = *tp * 10 + (pch - digits); 97 98 if (saw_digit && *tp == 0) 99 return (0); 100 if (new > 255) 101 return (0); 102 *tp = new; 103 if (!saw_digit) { 104 if (++octets > 4) 105 return (0); 106 saw_digit = 1; 107 } 108 } else if (ch == '.' && saw_digit) { 109 if (octets == 4) 110 return (0); 111 *++tp = 0; 112 saw_digit = 0; 113 } else 114 return (0); 115 } 116 if (octets < 4) 117 return (0); 118 memcpy(dst, tmp, NS_INADDRSZ); 119 return (1); 120} 121 122/* int 123 * inet_pton6(src, dst) 124 * convert presentation level address to network order binary form. 125 * return: 126 * 1 if `src' is a valid [RFC1884 2.2] address, else 0. 127 * notice: 128 * (1) does not touch `dst' unless it's returning 1. 129 * (2) :: in a full address is silently ignored. 130 * credit: 131 * inspired by Mark Andrews. 132 * author: 133 * Paul Vixie, 1996. 134 */ 135static int 136inet_pton6(src, dst) 137 const char *src; 138 u_char *dst; 139{ 140 static const char xdigits_l[] = "0123456789abcdef", 141 xdigits_u[] = "0123456789ABCDEF"; 142 u_char tmp[NS_IN6ADDRSZ], *tp, *endp, *colonp; 143 const char *xdigits, *curtok; 144 int ch, seen_xdigits; 145 u_int val; 146 147 memset((tp = tmp), '\0', NS_IN6ADDRSZ); 148 endp = tp + NS_IN6ADDRSZ; 149 colonp = NULL; 150 /* Leading :: requires some special handling. */ 151 if (*src == ':') 152 if (*++src != ':') 153 return (0); 154 curtok = src; 155 seen_xdigits = 0; 156 val = 0; 157 while ((ch = *src++) != '\0') { 158 const char *pch; 159 160 if ((pch = strchr((xdigits = xdigits_l), ch)) == NULL) 161 pch = strchr((xdigits = xdigits_u), ch); 162 if (pch != NULL) { 163 val <<= 4; 164 val |= (pch - xdigits); 165 if (++seen_xdigits > 4) 166 return (0); 167 continue; 168 } 169 if (ch == ':') { 170 curtok = src; 171 if (!seen_xdigits) { 172 if (colonp) 173 return (0); 174 colonp = tp; 175 continue; 176 } else if (*src == '\0') { 177 return (0); 178 } 179 if (tp + NS_INT16SZ > endp) 180 return (0); 181 *tp++ = (u_char) (val >> 8) & 0xff; 182 *tp++ = (u_char) val & 0xff; 183 seen_xdigits = 0; 184 val = 0; 185 continue; 186 } 187 if (ch == '.' && ((tp + NS_INADDRSZ) <= endp) && 188 inet_pton4(curtok, tp) > 0) { 189 tp += NS_INADDRSZ; 190 seen_xdigits = 0; 191 break; /*%< '\\0' was seen by inet_pton4(). */ 192 } 193 return (0); 194 } 195 if (seen_xdigits) { 196 if (tp + NS_INT16SZ > endp) 197 return (0); 198 *tp++ = (u_char) (val >> 8) & 0xff; 199 *tp++ = (u_char) val & 0xff; 200 } 201 if (colonp != NULL) { 202 /* 203 * Since some memmove()'s erroneously fail to handle 204 * overlapping regions, we'll do the shift by hand. 205 */ 206 const int n = tp - colonp; 207 int i; 208 209 if (tp == endp) 210 return (0); 211 for (i = 1; i <= n; i++) { 212 endp[- i] = colonp[n - i]; 213 colonp[n - i] = 0; 214 } 215 tp = endp; 216 } 217 if (tp != endp) 218 return (0); 219 memcpy(dst, tmp, NS_IN6ADDRSZ); 220 return (1); 221} 222 223#undef inet_pton 224#pragma weak inet_pton = __inet_pton 225