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