1 /*- 2 * SPDX-License-Identifier: (BSD-3-Clause AND ISC) 3 * 4 * Copyright (c) 1983, 1990, 1993 5 * The Regents of the University of California. All rights reserved. 6 * 7 * Redistribution and use in source and binary forms, with or without 8 * modification, are permitted provided that the following conditions 9 * are met: 10 * 1. Redistributions of source code must retain the above copyright 11 * notice, this list of conditions and the following disclaimer. 12 * 2. Redistributions in binary form must reproduce the above copyright 13 * notice, this list of conditions and the following disclaimer in the 14 * documentation and/or other materials provided with the distribution. 15 * 3. Neither the name of the University nor the names of its contributors 16 * may be used to endorse or promote products derived from this software 17 * without specific prior written permission. 18 * 19 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 20 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 21 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 22 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 23 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 24 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 25 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 26 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 27 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 28 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 29 * SUCH DAMAGE. 30 */ 31 32 /* 33 * Portions Copyright (c) 1993 by Digital Equipment Corporation. 34 * 35 * Permission to use, copy, modify, and distribute this software for any 36 * purpose with or without fee is hereby granted, provided that the above 37 * copyright notice and this permission notice appear in all copies, and that 38 * the name of Digital Equipment Corporation not be used in advertising or 39 * publicity pertaining to distribution of the document or software without 40 * specific, written prior permission. 41 * 42 * THE SOFTWARE IS PROVIDED "AS IS" AND DIGITAL EQUIPMENT CORP. DISCLAIMS ALL 43 * WARRANTIES WITH REGARD TO THIS SOFTWARE, INCLUDING ALL IMPLIED WARRANTIES 44 * OF MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL DIGITAL EQUIPMENT 45 * CORPORATION BE LIABLE FOR ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL 46 * DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR 47 * PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS 48 * ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS 49 * SOFTWARE. 50 */ 51 52 /* 53 * Copyright (c) 2004 by Internet Systems Consortium, Inc. ("ISC") 54 * Portions Copyright (c) 1996-1999 by Internet Software Consortium. 55 * 56 * Permission to use, copy, modify, and distribute this software for any 57 * purpose with or without fee is hereby granted, provided that the above 58 * copyright notice and this permission notice appear in all copies. 59 * 60 * THE SOFTWARE IS PROVIDED "AS IS" AND ISC DISCLAIMS ALL WARRANTIES 61 * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF 62 * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL ISC BE LIABLE FOR 63 * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES 64 * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN 65 * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT 66 * OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE. 67 */ 68 69 #if defined(LIBC_SCCS) && !defined(lint) 70 static const char sccsid[] = "@(#)inet_addr.c 8.1 (Berkeley) 6/17/93"; 71 static const char rcsid[] = "$Id: inet_addr.c,v 1.5 2005/04/27 04:56:19 sra Exp $"; 72 #endif /* LIBC_SCCS and not lint */ 73 #include <sys/cdefs.h> 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 |= (uint32_t)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 |= ((uint32_t)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 |= ((uint32_t)parts[0] << 24) | (parts[1] << 16) | 198 (parts[2] << 8); 199 break; 200 } 201 if (addr != NULL) 202 addr->s_addr = htonl(val); 203 return (1); 204 } 205 206 /* 207 * Weak aliases for applications that use certain private entry points, 208 * and fail to include <arpa/inet.h>. 209 */ 210 #undef inet_addr 211 __weak_reference(__inet_addr, inet_addr); 212 #undef inet_aton 213 __weak_reference(__inet_aton, inet_aton); 214 215 /*! \file */ 216