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