inet_pton.c revision 177685
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 1.3.18.2 2005/07/28 07:38:07 marka Exp $"; 20#endif /* LIBC_SCCS and not lint */ 21#include <sys/cdefs.h> 22__FBSDID("$FreeBSD: head/sys/rpc/inet_pton.c 177685 2008-03-28 09:50:32Z dfr $"); 23 24#include <sys/param.h> 25#include <sys/types.h> 26#include <sys/socket.h> 27#include <sys/systm.h> 28 29#include <rpc/types.h> 30#include <rpc/rpc_com.h> 31 32#if __FreeBSD_version < 700000 33#define strchr index 34#endif 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 41static int inet_pton4(const char *src, u_char *dst); 42static 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 */ 55int 56__rpc_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 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#define NS_INADDRSZ 4 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 */ 133static int 134inet_pton6(const char *src, u_char *dst) 135{ 136 static const char xdigits_l[] = "0123456789abcdef", 137 xdigits_u[] = "0123456789ABCDEF"; 138#define NS_IN6ADDRSZ 16 139#define NS_INT16SZ 2 140 u_char tmp[NS_IN6ADDRSZ], *tp, *endp, *colonp; 141 const char *xdigits, *curtok; 142 int ch, seen_xdigits; 143 u_int val; 144 145 memset((tp = tmp), '\0', NS_IN6ADDRSZ); 146 endp = tp + NS_IN6ADDRSZ; 147 colonp = NULL; 148 /* Leading :: requires some special handling. */ 149 if (*src == ':') 150 if (*++src != ':') 151 return (0); 152 curtok = src; 153 seen_xdigits = 0; 154 val = 0; 155 while ((ch = *src++) != '\0') { 156 const char *pch; 157 158 if ((pch = strchr((xdigits = xdigits_l), ch)) == NULL) 159 pch = strchr((xdigits = xdigits_u), ch); 160 if (pch != NULL) { 161 val <<= 4; 162 val |= (pch - xdigits); 163 if (++seen_xdigits > 4) 164 return (0); 165 continue; 166 } 167 if (ch == ':') { 168 curtok = src; 169 if (!seen_xdigits) { 170 if (colonp) 171 return (0); 172 colonp = tp; 173 continue; 174 } else if (*src == '\0') { 175 return (0); 176 } 177 if (tp + NS_INT16SZ > endp) 178 return (0); 179 *tp++ = (u_char) (val >> 8) & 0xff; 180 *tp++ = (u_char) val & 0xff; 181 seen_xdigits = 0; 182 val = 0; 183 continue; 184 } 185 if (ch == '.' && ((tp + NS_INADDRSZ) <= endp) && 186 inet_pton4(curtok, tp) > 0) { 187 tp += NS_INADDRSZ; 188 seen_xdigits = 0; 189 break; /*%< '\\0' was seen by inet_pton4(). */ 190 } 191 return (0); 192 } 193 if (seen_xdigits) { 194 if (tp + NS_INT16SZ > endp) 195 return (0); 196 *tp++ = (u_char) (val >> 8) & 0xff; 197 *tp++ = (u_char) val & 0xff; 198 } 199 if (colonp != NULL) { 200 /* 201 * Since some memmove()'s erroneously fail to handle 202 * overlapping regions, we'll do the shift by hand. 203 */ 204 const int n = tp - colonp; 205 int i; 206 207 if (tp == endp) 208 return (0); 209 for (i = 1; i <= n; i++) { 210 endp[- i] = colonp[n - i]; 211 colonp[n - i] = 0; 212 } 213 tp = endp; 214 } 215 if (tp != endp) 216 return (0); 217 memcpy(dst, tmp, NS_IN6ADDRSZ); 218 return (1); 219} 220 221/* 222 * Weak aliases for applications that use certain private entry points, 223 * and fail to include <arpa/inet.h>. 224 */ 225#undef inet_pton 226__weak_reference(__inet_pton, inet_pton); 227 228/*! \file */ 229