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) 19 static 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 38 static int inet_pton4 __P((const char *src, u_char *dst)); 39 static 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 */ 52 int 53 inet_pton(int af, const char *src, void *dst) 54 { 55 switch (af) { 56 case AF_INET: 57 return (inet_pton4(src, dst)); 58 case AF_INET6: 59 return (inet_pton6(src, dst)); 60 default: 61 errno = EAFNOSUPPORT; 62 return (-1); 63 } 64 /* NOTREACHED */ 65 } 66 67 /* int 68 * inet_pton4(src, dst) 69 * like inet_aton() but without all the hexadecimal and shorthand. 70 * return: 71 * 1 if `src' is a valid dotted quad, else 0. 72 * notice: 73 * does not touch `dst' unless it's returning 1. 74 * author: 75 * Paul Vixie, 1996. 76 */ 77 static int 78 inet_pton4(const char *src, u_char *dst) 79 { 80 static const char digits[] = "0123456789"; 81 int saw_digit, octets, ch; 82 u_char tmp[NS_INADDRSZ], *tp; 83 84 saw_digit = 0; 85 octets = 0; 86 *(tp = tmp) = 0; 87 while ((ch = *src++) != '\0') { 88 const char *pch; 89 90 if ((pch = strchr(digits, ch)) != NULL) { 91 u_int new = *tp * 10 + (pch - digits); 92 93 if (saw_digit && *tp == 0) 94 return (0); 95 if (new > 255) 96 return (0); 97 *tp = new; 98 if (!saw_digit) { 99 if (++octets > 4) 100 return (0); 101 saw_digit = 1; 102 } 103 } else if (ch == '.' && saw_digit) { 104 if (octets == 4) 105 return (0); 106 *++tp = 0; 107 saw_digit = 0; 108 } else 109 return (0); 110 } 111 if (octets < 4) 112 return (0); 113 memcpy(dst, tmp, NS_INADDRSZ); 114 return (1); 115 } 116 117 /* int 118 * inet_pton6(src, dst) 119 * convert presentation level address to network order binary form. 120 * return: 121 * 1 if `src' is a valid [RFC1884 2.2] address, else 0. 122 * notice: 123 * (1) does not touch `dst' unless it's returning 1. 124 * (2) :: in a full address is silently ignored. 125 * credit: 126 * inspired by Mark Andrews. 127 * author: 128 * Paul Vixie, 1996. 129 */ 130 static int 131 inet_pton6(const char *src, u_char *dst) 132 { 133 static const char xdigits_l[] = "0123456789abcdef", 134 xdigits_u[] = "0123456789ABCDEF"; 135 u_char tmp[NS_IN6ADDRSZ], *tp, *endp, *colonp; 136 const char *xdigits, *curtok; 137 int ch, seen_xdigits; 138 u_int val; 139 140 memset((tp = tmp), '\0', NS_IN6ADDRSZ); 141 endp = tp + NS_IN6ADDRSZ; 142 colonp = NULL; 143 /* Leading :: requires some special handling. */ 144 if (*src == ':') 145 if (*++src != ':') 146 return (0); 147 curtok = src; 148 seen_xdigits = 0; 149 val = 0; 150 while ((ch = *src++) != '\0') { 151 const char *pch; 152 153 if ((pch = strchr((xdigits = xdigits_l), ch)) == NULL) 154 pch = strchr((xdigits = xdigits_u), ch); 155 if (pch != NULL) { 156 val <<= 4; 157 val |= (pch - xdigits); 158 if (++seen_xdigits > 4) 159 return (0); 160 continue; 161 } 162 if (ch == ':') { 163 curtok = src; 164 if (!seen_xdigits) { 165 if (colonp) 166 return (0); 167 colonp = tp; 168 continue; 169 } else if (*src == '\0') { 170 return (0); 171 } 172 if (tp + NS_INT16SZ > endp) 173 return (0); 174 *tp++ = (u_char) (val >> 8) & 0xff; 175 *tp++ = (u_char) val & 0xff; 176 seen_xdigits = 0; 177 val = 0; 178 continue; 179 } 180 if (ch == '.' && ((tp + NS_INADDRSZ) <= endp) && 181 inet_pton4(curtok, tp) > 0) { 182 tp += NS_INADDRSZ; 183 seen_xdigits = 0; 184 break; /*%< '\\0' was seen by inet_pton4(). */ 185 } 186 return (0); 187 } 188 if (seen_xdigits) { 189 if (tp + NS_INT16SZ > endp) 190 return (0); 191 *tp++ = (u_char) (val >> 8) & 0xff; 192 *tp++ = (u_char) val & 0xff; 193 } 194 if (colonp != NULL) { 195 /* 196 * Since some memmove()'s erroneously fail to handle 197 * overlapping regions, we'll do the shift by hand. 198 */ 199 const int n = tp - colonp; 200 int i; 201 202 if (tp == endp) 203 return (0); 204 for (i = 1; i <= n; i++) { 205 endp[- i] = colonp[n - i]; 206 colonp[n - i] = 0; 207 } 208 tp = endp; 209 } 210 if (tp != endp) 211 return (0); 212 memcpy(dst, tmp, NS_IN6ADDRSZ); 213 return (1); 214 } 215 216 #ifdef _LIBC 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 #endif 224 /*! \file */ 225