1 /* 2 * Copyright (c) 1983, 1990, 1993 3 * The Regents of the University of California. All rights reserved. 4 * 5 * Redistribution and use in source and binary forms, with or without 6 * modification, are permitted provided that the following conditions 7 * are met: 8 * 1. Redistributions of source code must retain the above copyright 9 * notice, this list of conditions and the following disclaimer. 10 * 2. Redistributions in binary form must reproduce the above copyright 11 * notice, this list of conditions and the following disclaimer in the 12 * documentation and/or other materials provided with the distribution. 13 * 3. Neither the name of the University nor the names of its contributors 14 * may be used to endorse or promote products derived from this software 15 * without specific prior written permission. 16 * 17 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 18 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 19 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 20 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 21 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 22 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 23 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 24 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 25 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 26 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 27 * SUCH DAMAGE. 28 */ 29 30 /* 31 * Portions Copyright (c) 1993 by Digital Equipment Corporation. 32 * 33 * Permission to use, copy, modify, and distribute this software for any 34 * purpose with or without fee is hereby granted, provided that the above 35 * copyright notice and this permission notice appear in all copies, and that 36 * the name of Digital Equipment Corporation not be used in advertising or 37 * publicity pertaining to distribution of the document or software without 38 * specific, written prior permission. 39 * 40 * THE SOFTWARE IS PROVIDED "AS IS" AND DIGITAL EQUIPMENT CORP. DISCLAIMS ALL 41 * WARRANTIES WITH REGARD TO THIS SOFTWARE, INCLUDING ALL IMPLIED WARRANTIES 42 * OF MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL DIGITAL EQUIPMENT 43 * CORPORATION BE LIABLE FOR ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL 44 * DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR 45 * PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS 46 * ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS 47 * SOFTWARE. 48 */ 49 50 /* 51 * Copyright (c) 2004 by Internet Systems Consortium, Inc. ("ISC") 52 * Portions Copyright (c) 1996-1999 by Internet Software Consortium. 53 * 54 * Permission to use, copy, modify, and distribute this software for any 55 * purpose with or without fee is hereby granted, provided that the above 56 * copyright notice and this permission notice appear in all copies. 57 * 58 * THE SOFTWARE IS PROVIDED "AS IS" AND ISC DISCLAIMS ALL WARRANTIES 59 * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF 60 * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL ISC BE LIABLE FOR 61 * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES 62 * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN 63 * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT 64 * OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE. 65 */ 66 67 #if defined(LIBC_SCCS) && !defined(lint) 68 static const char sccsid[] = "@(#)inet_addr.c 8.1 (Berkeley) 6/17/93"; 69 static const char rcsid[] = "$Id: inet_addr.c,v 1.5 2005/04/27 04:56:19 sra Exp $"; 70 #endif /* LIBC_SCCS and not lint */ 71 #include <sys/cdefs.h> 72 __FBSDID("$FreeBSD$"); 73 74 #include "port_before.h" 75 76 #include <sys/param.h> 77 78 #include <netinet/in.h> 79 #include <arpa/inet.h> 80 81 #include <ctype.h> 82 83 #include "port_after.h" 84 85 /*% 86 * Ascii internet address interpretation routine. 87 * The value returned is in network order. 88 */ 89 in_addr_t /* XXX should be struct in_addr :( */ 90 inet_addr(const char *cp) { 91 struct in_addr val; 92 93 if (inet_aton(cp, &val)) 94 return (val.s_addr); 95 return (INADDR_NONE); 96 } 97 98 /*% 99 * Check whether "cp" is a valid ascii representation 100 * of an Internet address and convert to a binary address. 101 * Returns 1 if the address is valid, 0 if not. 102 * This replaces inet_addr, the return value from which 103 * cannot distinguish between failure and a local broadcast address. 104 */ 105 int 106 inet_aton(const char *cp, struct in_addr *addr) { 107 u_long val; 108 int base, n; 109 char c; 110 u_int8_t parts[4]; 111 u_int8_t *pp = parts; 112 int digit; 113 114 c = *cp; 115 for (;;) { 116 /* 117 * Collect number up to ``.''. 118 * Values are specified as for C: 119 * 0x=hex, 0=octal, isdigit=decimal. 120 */ 121 if (!isdigit((unsigned char)c)) 122 return (0); 123 val = 0; base = 10; digit = 0; 124 if (c == '0') { 125 c = *++cp; 126 if (c == 'x' || c == 'X') 127 base = 16, c = *++cp; 128 else { 129 base = 8; 130 digit = 1 ; 131 } 132 } 133 for (;;) { 134 if (isascii(c) && isdigit((unsigned char)c)) { 135 if (base == 8 && (c == '8' || c == '9')) 136 return (0); 137 val = (val * base) + (c - '0'); 138 c = *++cp; 139 digit = 1; 140 } else if (base == 16 && isascii(c) && 141 isxdigit((unsigned char)c)) { 142 val = (val << 4) | 143 (c + 10 - (islower((unsigned char)c) ? 'a' : 'A')); 144 c = *++cp; 145 digit = 1; 146 } else 147 break; 148 } 149 if (c == '.') { 150 /* 151 * Internet format: 152 * a.b.c.d 153 * a.b.c (with c treated as 16 bits) 154 * a.b (with b treated as 24 bits) 155 */ 156 if (pp >= parts + 3 || val > 0xffU) 157 return (0); 158 *pp++ = val; 159 c = *++cp; 160 } else 161 break; 162 } 163 /* 164 * Check for trailing characters. 165 */ 166 if (c != '\0' && (!isascii(c) || !isspace((unsigned char)c))) 167 return (0); 168 /* 169 * Did we get a valid digit? 170 */ 171 if (!digit) 172 return (0); 173 /* 174 * Concoct the address according to 175 * the number of parts specified. 176 */ 177 n = pp - parts + 1; 178 switch (n) { 179 case 1: /*%< a -- 32 bits */ 180 break; 181 182 case 2: /*%< a.b -- 8.24 bits */ 183 if (val > 0xffffffU) 184 return (0); 185 val |= parts[0] << 24; 186 break; 187 188 case 3: /*%< a.b.c -- 8.8.16 bits */ 189 if (val > 0xffffU) 190 return (0); 191 val |= (parts[0] << 24) | (parts[1] << 16); 192 break; 193 194 case 4: /*%< a.b.c.d -- 8.8.8.8 bits */ 195 if (val > 0xffU) 196 return (0); 197 val |= (parts[0] << 24) | (parts[1] << 16) | (parts[2] << 8); 198 break; 199 } 200 if (addr != NULL) 201 addr->s_addr = htonl(val); 202 return (1); 203 } 204 205 /* 206 * Weak aliases for applications that use certain private entry points, 207 * and fail to include <arpa/inet.h>. 208 */ 209 #undef inet_addr 210 __weak_reference(__inet_addr, inet_addr); 211 #undef inet_aton 212 __weak_reference(__inet_aton, inet_aton); 213 214 /*! \file */ 215