1 /*- 2 * SPDX-License-Identifier: ISC 3 * 4 * Copyright (c) 2004 by Internet Systems Consortium, Inc. ("ISC") 5 * Copyright (c) 1996,1999 by Internet Software Consortium. 6 * 7 * Permission to use, copy, modify, and distribute this software for any 8 * purpose with or without fee is hereby granted, provided that the above 9 * copyright notice and this permission notice appear in all copies. 10 * 11 * THE SOFTWARE IS PROVIDED "AS IS" AND ISC DISCLAIMS ALL WARRANTIES 12 * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF 13 * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL ISC BE LIABLE FOR 14 * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES 15 * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN 16 * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT 17 * OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE. 18 */ 19 20 #if defined(LIBC_SCCS) && !defined(lint) 21 static const char rcsid[] = "$Id: inet_pton.c,v 1.5 2005/07/28 06:51:47 marka Exp $"; 22 #endif /* LIBC_SCCS and not lint */ 23 #include <sys/cdefs.h> 24 __FBSDID("$FreeBSD$"); 25 26 #include "port_before.h" 27 #include <sys/param.h> 28 #include <sys/socket.h> 29 #include <netinet/in.h> 30 #include <arpa/inet.h> 31 #include <arpa/nameser.h> 32 #include <string.h> 33 #include <errno.h> 34 #include "port_after.h" 35 36 /*% 37 * WARNING: Don't even consider trying to compile this on a system where 38 * sizeof(int) < 4. sizeof(int) > 4 is fine; all the world's not a VAX. 39 */ 40 41 static int inet_pton4(const char *src, u_char *dst); 42 static int inet_pton6(const char *src, u_char *dst); 43 44 /* int 45 * inet_pton(af, src, dst) 46 * convert from presentation format (which usually means ASCII printable) 47 * to network format (which is usually some kind of binary format). 48 * return: 49 * 1 if the address was valid for the specified address family 50 * 0 if the address wasn't valid (`dst' is untouched in this case) 51 * -1 if some other error occurred (`dst' is untouched in this case, too) 52 * author: 53 * Paul Vixie, 1996. 54 */ 55 int 56 inet_pton(int af, const char * __restrict src, void * __restrict 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 */ 80 static int 81 inet_pton4(const char *src, u_char *dst) 82 { 83 static const char digits[] = "0123456789"; 84 int saw_digit, octets, ch; 85 u_char tmp[NS_INADDRSZ], *tp; 86 87 saw_digit = 0; 88 octets = 0; 89 *(tp = tmp) = 0; 90 while ((ch = *src++) != '\0') { 91 const char *pch; 92 93 if ((pch = strchr(digits, ch)) != NULL) { 94 u_int new = *tp * 10 + (pch - digits); 95 96 if (saw_digit && *tp == 0) 97 return (0); 98 if (new > 255) 99 return (0); 100 *tp = new; 101 if (!saw_digit) { 102 if (++octets > 4) 103 return (0); 104 saw_digit = 1; 105 } 106 } else if (ch == '.' && saw_digit) { 107 if (octets == 4) 108 return (0); 109 *++tp = 0; 110 saw_digit = 0; 111 } else 112 return (0); 113 } 114 if (octets < 4) 115 return (0); 116 memcpy(dst, tmp, NS_INADDRSZ); 117 return (1); 118 } 119 120 /* int 121 * inet_pton6(src, dst) 122 * convert presentation level address to network order binary form. 123 * return: 124 * 1 if `src' is a valid [RFC1884 2.2] address, else 0. 125 * notice: 126 * (1) does not touch `dst' unless it's returning 1. 127 * (2) :: in a full address is silently ignored. 128 * credit: 129 * inspired by Mark Andrews. 130 * author: 131 * Paul Vixie, 1996. 132 */ 133 static int 134 inet_pton6(const char *src, u_char *dst) 135 { 136 static const char xdigits_l[] = "0123456789abcdef", 137 xdigits_u[] = "0123456789ABCDEF"; 138 u_char tmp[NS_IN6ADDRSZ], *tp, *endp, *colonp; 139 const char *xdigits, *curtok; 140 int ch, seen_xdigits; 141 u_int val; 142 143 memset((tp = tmp), '\0', NS_IN6ADDRSZ); 144 endp = tp + NS_IN6ADDRSZ; 145 colonp = NULL; 146 /* Leading :: requires some special handling. */ 147 if (*src == ':') 148 if (*++src != ':') 149 return (0); 150 curtok = src; 151 seen_xdigits = 0; 152 val = 0; 153 while ((ch = *src++) != '\0') { 154 const char *pch; 155 156 if ((pch = strchr((xdigits = xdigits_l), ch)) == NULL) 157 pch = strchr((xdigits = xdigits_u), ch); 158 if (pch != NULL) { 159 val <<= 4; 160 val |= (pch - xdigits); 161 if (++seen_xdigits > 4) 162 return (0); 163 continue; 164 } 165 if (ch == ':') { 166 curtok = src; 167 if (!seen_xdigits) { 168 if (colonp) 169 return (0); 170 colonp = tp; 171 continue; 172 } else if (*src == '\0') { 173 return (0); 174 } 175 if (tp + NS_INT16SZ > endp) 176 return (0); 177 *tp++ = (u_char) (val >> 8) & 0xff; 178 *tp++ = (u_char) val & 0xff; 179 seen_xdigits = 0; 180 val = 0; 181 continue; 182 } 183 if (ch == '.' && ((tp + NS_INADDRSZ) <= endp) && 184 inet_pton4(curtok, tp) > 0) { 185 tp += NS_INADDRSZ; 186 seen_xdigits = 0; 187 break; /*%< '\\0' was seen by inet_pton4(). */ 188 } 189 return (0); 190 } 191 if (seen_xdigits) { 192 if (tp + NS_INT16SZ > endp) 193 return (0); 194 *tp++ = (u_char) (val >> 8) & 0xff; 195 *tp++ = (u_char) val & 0xff; 196 } 197 if (colonp != NULL) { 198 /* 199 * Since some memmove()'s erroneously fail to handle 200 * overlapping regions, we'll do the shift by hand. 201 */ 202 const int n = tp - colonp; 203 int i; 204 205 if (tp == endp) 206 return (0); 207 for (i = 1; i <= n; i++) { 208 endp[- i] = colonp[n - i]; 209 colonp[n - i] = 0; 210 } 211 tp = endp; 212 } 213 if (tp != endp) 214 return (0); 215 memcpy(dst, tmp, NS_IN6ADDRSZ); 216 return (1); 217 } 218 219 /* 220 * Weak aliases for applications that use certain private entry points, 221 * and fail to include <arpa/inet.h>. 222 */ 223 #undef inet_pton 224 __weak_reference(__inet_pton, inet_pton); 225 226 /*! \file */ 227