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 "port_before.h" 74 75 #include <sys/param.h> 76 77 #include <netinet/in.h> 78 #include <arpa/inet.h> 79 80 #include <ctype.h> 81 82 #include "port_after.h" 83 84 /*% 85 * Ascii internet address interpretation routine. 86 * The value returned is in network order. 87 */ 88 in_addr_t /* XXX should be struct in_addr :( */ 89 inet_addr(const char *cp) { 90 struct in_addr val; 91 92 if (inet_aton(cp, &val)) 93 return (val.s_addr); 94 return (INADDR_NONE); 95 } 96 97 /*% 98 * Check whether "cp" is a valid ascii representation 99 * of an Internet address and convert to a binary address. 100 * Returns 1 if the address is valid, 0 if not. 101 * This replaces inet_addr, the return value from which 102 * cannot distinguish between failure and a local broadcast address. 103 */ 104 int 105 inet_aton(const char *cp, struct in_addr *addr) { 106 u_long val; 107 int base, n; 108 char c; 109 u_int8_t parts[4]; 110 u_int8_t *pp = parts; 111 int digit; 112 113 c = *cp; 114 for (;;) { 115 /* 116 * Collect number up to ``.''. 117 * Values are specified as for C: 118 * 0x=hex, 0=octal, isdigit=decimal. 119 */ 120 if (!isdigit((unsigned char)c)) 121 return (0); 122 val = 0; base = 10; digit = 0; 123 if (c == '0') { 124 c = *++cp; 125 if (c == 'x' || c == 'X') 126 base = 16, c = *++cp; 127 else { 128 base = 8; 129 digit = 1 ; 130 } 131 } 132 for (;;) { 133 if (isascii(c) && isdigit((unsigned char)c)) { 134 if (base == 8 && (c == '8' || c == '9')) 135 return (0); 136 val = (val * base) + (c - '0'); 137 c = *++cp; 138 digit = 1; 139 } else if (base == 16 && isascii(c) && 140 isxdigit((unsigned char)c)) { 141 val = (val << 4) | 142 (c + 10 - (islower((unsigned char)c) ? 'a' : 'A')); 143 c = *++cp; 144 digit = 1; 145 } else 146 break; 147 } 148 if (c == '.') { 149 /* 150 * Internet format: 151 * a.b.c.d 152 * a.b.c (with c treated as 16 bits) 153 * a.b (with b treated as 24 bits) 154 */ 155 if (pp >= parts + 3 || val > 0xffU) 156 return (0); 157 *pp++ = val; 158 c = *++cp; 159 } else 160 break; 161 } 162 /* 163 * Check for trailing characters. 164 */ 165 if (c != '\0' && (!isascii(c) || !isspace((unsigned char)c))) 166 return (0); 167 /* 168 * Did we get a valid digit? 169 */ 170 if (!digit) 171 return (0); 172 /* 173 * Concoct the address according to 174 * the number of parts specified. 175 */ 176 n = pp - parts + 1; 177 switch (n) { 178 case 1: /*%< a -- 32 bits */ 179 break; 180 181 case 2: /*%< a.b -- 8.24 bits */ 182 if (val > 0xffffffU) 183 return (0); 184 val |= (uint32_t)parts[0] << 24; 185 break; 186 187 case 3: /*%< a.b.c -- 8.8.16 bits */ 188 if (val > 0xffffU) 189 return (0); 190 val |= ((uint32_t)parts[0] << 24) | (parts[1] << 16); 191 break; 192 193 case 4: /*%< a.b.c.d -- 8.8.8.8 bits */ 194 if (val > 0xffU) 195 return (0); 196 val |= ((uint32_t)parts[0] << 24) | (parts[1] << 16) | 197 (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