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#if defined(LIBC_SCCS) && !defined(lint) 18static const char rcsid[] = "$Id: inet_pton.c,v 1.3.18.2 2005/07/28 07:38:07 marka Exp $"; 19#endif /* LIBC_SCCS and not lint */ 20 21#include <string.h> 22 23#include <sys/param.h> 24#include <sys/socket.h> 25#include <sys/systm.h> 26 27#include <netinet/in.h> 28 29/*% 30 * WARNING: Don't even consider trying to compile this on a system where 31 * sizeof(int) < 4. sizeof(int) > 4 is fine; all the world's not a VAX. 32 */ 33 34static int inet_pton4(const char *src, u_char *dst); 35static int inet_pton6(const char *src, u_char *dst); 36 37/* int 38 * inet_pton(af, src, dst) 39 * convert from presentation format (which usually means ASCII printable) 40 * to network format (which is usually some kind of binary format). 41 * return: 42 * 1 if the address was valid for the specified address family 43 * 0 if the address wasn't valid (`dst' is untouched in this case) 44 * -1 if some other error occurred (`dst' is untouched in this case, too) 45 * author: 46 * Paul Vixie, 1996. 47 */ 48int 49inet_pton(int af, const char *src, void *dst) 50{ 51 switch (af) { 52 case AF_INET: 53 return (inet_pton4(src, dst)); 54 case AF_INET6: 55 return (inet_pton6(src, dst)); 56 default: 57 return (-1); 58 } 59 /* NOTREACHED */ 60} 61 62/* int 63 * inet_pton4(src, dst) 64 * like inet_aton() but without all the hexadecimal and shorthand. 65 * return: 66 * 1 if `src' is a valid dotted quad, else 0. 67 * notice: 68 * does not touch `dst' unless it's returning 1. 69 * author: 70 * Paul Vixie, 1996. 71 */ 72static int 73inet_pton4(const char *src, u_char *dst) 74{ 75 static const char digits[] = "0123456789"; 76 int saw_digit, octets, ch; 77#define NS_INADDRSZ 4 78 u_char tmp[NS_INADDRSZ], *tp; 79 80 saw_digit = 0; 81 octets = 0; 82 *(tp = tmp) = 0; 83 while ((ch = *src++) != '\0') { 84 const char *pch; 85 86 if ((pch = strchr(digits, ch)) != NULL) { 87 u_int new = *tp * 10 + (pch - digits); 88 89 if (saw_digit && *tp == 0) 90 return (0); 91 if (new > 255) 92 return (0); 93 *tp = new; 94 if (!saw_digit) { 95 if (++octets > 4) 96 return (0); 97 saw_digit = 1; 98 } 99 } else if (ch == '.' && saw_digit) { 100 if (octets == 4) 101 return (0); 102 *++tp = 0; 103 saw_digit = 0; 104 } else 105 return (0); 106 } 107 if (octets < 4) 108 return (0); 109 memcpy(dst, tmp, NS_INADDRSZ); 110 return (1); 111} 112 113/* int 114 * inet_pton6(src, dst) 115 * convert presentation level address to network order binary form. 116 * return: 117 * 1 if `src' is a valid [RFC1884 2.2] address, else 0. 118 * notice: 119 * (1) does not touch `dst' unless it's returning 1. 120 * (2) :: in a full address is silently ignored. 121 * credit: 122 * inspired by Mark Andrews. 123 * author: 124 * Paul Vixie, 1996. 125 */ 126static int 127inet_pton6(const char *src, u_char *dst) 128{ 129 static const char xdigits_l[] = "0123456789abcdef", 130 xdigits_u[] = "0123456789ABCDEF"; 131#define NS_IN6ADDRSZ 16 132#define NS_INT16SZ 2 133 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