inet_pton.c revision 270838
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) 19static const char rcsid[] = "$Id: inet_pton.c,v 1.5 2005/07/28 06:51:47 marka Exp $"; 20#endif /* LIBC_SCCS and not lint */ 21#include <sys/cdefs.h> 22__FBSDID("$FreeBSD: stable/10/lib/libc/inet/inet_pton.c 270838 2014-08-30 10:16:25Z ume $"); 23 24#include "port_before.h" 25#include <sys/param.h> 26#include <sys/types.h> 27#include <sys/socket.h> 28#include <netinet/in.h> 29#include <arpa/inet.h> 30#include <arpa/nameser.h> 31#include <string.h> 32#include <errno.h> 33#include "port_after.h" 34 35/*% 36 * WARNING: Don't even consider trying to compile this on a system where 37 * sizeof(int) < 4. sizeof(int) > 4 is fine; all the world's not a VAX. 38 */ 39 40static int inet_pton4(const char *src, u_char *dst); 41static int inet_pton6(const char *src, u_char *dst); 42 43/* int 44 * inet_pton(af, src, dst) 45 * convert from presentation format (which usually means ASCII printable) 46 * to network format (which is usually some kind of binary format). 47 * return: 48 * 1 if the address was valid for the specified address family 49 * 0 if the address wasn't valid (`dst' is untouched in this case) 50 * -1 if some other error occurred (`dst' is untouched in this case, too) 51 * author: 52 * Paul Vixie, 1996. 53 */ 54int 55inet_pton(int af, const char * __restrict src, void * __restrict dst) 56{ 57 switch (af) { 58 case AF_INET: 59 return (inet_pton4(src, dst)); 60 case AF_INET6: 61 return (inet_pton6(src, dst)); 62 default: 63 errno = EAFNOSUPPORT; 64 return (-1); 65 } 66 /* NOTREACHED */ 67} 68 69/* int 70 * inet_pton4(src, dst) 71 * like inet_aton() but without all the hexadecimal and shorthand. 72 * return: 73 * 1 if `src' is a valid dotted quad, else 0. 74 * notice: 75 * does not touch `dst' unless it's returning 1. 76 * author: 77 * Paul Vixie, 1996. 78 */ 79static int 80inet_pton4(const char *src, u_char *dst) 81{ 82 static const char digits[] = "0123456789"; 83 int saw_digit, octets, ch; 84 u_char tmp[NS_INADDRSZ], *tp; 85 86 saw_digit = 0; 87 octets = 0; 88 *(tp = tmp) = 0; 89 while ((ch = *src++) != '\0') { 90 const char *pch; 91 92 if ((pch = strchr(digits, ch)) != NULL) { 93 u_int new = *tp * 10 + (pch - digits); 94 95 if (saw_digit && *tp == 0) 96 return (0); 97 if (new > 255) 98 return (0); 99 *tp = new; 100 if (!saw_digit) { 101 if (++octets > 4) 102 return (0); 103 saw_digit = 1; 104 } 105 } else if (ch == '.' && saw_digit) { 106 if (octets == 4) 107 return (0); 108 *++tp = 0; 109 saw_digit = 0; 110 } else 111 return (0); 112 } 113 if (octets < 4) 114 return (0); 115 memcpy(dst, tmp, NS_INADDRSZ); 116 return (1); 117} 118 119/* int 120 * inet_pton6(src, dst) 121 * convert presentation level address to network order binary form. 122 * return: 123 * 1 if `src' is a valid [RFC1884 2.2] address, else 0. 124 * notice: 125 * (1) does not touch `dst' unless it's returning 1. 126 * (2) :: in a full address is silently ignored. 127 * credit: 128 * inspired by Mark Andrews. 129 * author: 130 * Paul Vixie, 1996. 131 */ 132static int 133inet_pton6(const char *src, u_char *dst) 134{ 135 static const char xdigits_l[] = "0123456789abcdef", 136 xdigits_u[] = "0123456789ABCDEF"; 137 u_char tmp[NS_IN6ADDRSZ], *tp, *endp, *colonp; 138 const char *xdigits, *curtok; 139 int ch, seen_xdigits; 140 u_int val; 141 142 memset((tp = tmp), '\0', NS_IN6ADDRSZ); 143 endp = tp + NS_IN6ADDRSZ; 144 colonp = NULL; 145 /* Leading :: requires some special handling. */ 146 if (*src == ':') 147 if (*++src != ':') 148 return (0); 149 curtok = src; 150 seen_xdigits = 0; 151 val = 0; 152 while ((ch = *src++) != '\0') { 153 const char *pch; 154 155 if ((pch = strchr((xdigits = xdigits_l), ch)) == NULL) 156 pch = strchr((xdigits = xdigits_u), ch); 157 if (pch != NULL) { 158 val <<= 4; 159 val |= (pch - xdigits); 160 if (++seen_xdigits > 4) 161 return (0); 162 continue; 163 } 164 if (ch == ':') { 165 curtok = src; 166 if (!seen_xdigits) { 167 if (colonp) 168 return (0); 169 colonp = tp; 170 continue; 171 } else if (*src == '\0') { 172 return (0); 173 } 174 if (tp + NS_INT16SZ > endp) 175 return (0); 176 *tp++ = (u_char) (val >> 8) & 0xff; 177 *tp++ = (u_char) val & 0xff; 178 seen_xdigits = 0; 179 val = 0; 180 continue; 181 } 182 if (ch == '.' && ((tp + NS_INADDRSZ) <= endp) && 183 inet_pton4(curtok, tp) > 0) { 184 tp += NS_INADDRSZ; 185 seen_xdigits = 0; 186 break; /*%< '\\0' was seen by inet_pton4(). */ 187 } 188 return (0); 189 } 190 if (seen_xdigits) { 191 if (tp + NS_INT16SZ > endp) 192 return (0); 193 *tp++ = (u_char) (val >> 8) & 0xff; 194 *tp++ = (u_char) val & 0xff; 195 } 196 if (colonp != NULL) { 197 /* 198 * Since some memmove()'s erroneously fail to handle 199 * overlapping regions, we'll do the shift by hand. 200 */ 201 const int n = tp - colonp; 202 int i; 203 204 if (tp == endp) 205 return (0); 206 for (i = 1; i <= n; i++) { 207 endp[- i] = colonp[n - i]; 208 colonp[n - i] = 0; 209 } 210 tp = endp; 211 } 212 if (tp != endp) 213 return (0); 214 memcpy(dst, tmp, NS_IN6ADDRSZ); 215 return (1); 216} 217 218/* 219 * Weak aliases for applications that use certain private entry points, 220 * and fail to include <arpa/inet.h>. 221 */ 222#undef inet_pton 223__weak_reference(__inet_pton, inet_pton); 224 225/*! \file */ 226