inet_addr.c revision 330897
1/*- 2 * SPDX-License-Identifier: BSD-3-Clause 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 * 4. 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) 70static const char sccsid[] = "@(#)inet_addr.c 8.1 (Berkeley) 6/17/93"; 71static const char rcsid[] = "$Id: inet_addr.c,v 1.5 2005/04/27 04:56:19 sra Exp $"; 72#endif /* LIBC_SCCS and not lint */ 73#include <sys/cdefs.h> 74__FBSDID("$FreeBSD: stable/11/lib/libc/inet/inet_addr.c 330897 2018-03-14 03:19:51Z eadler $"); 75 76#include "port_before.h" 77 78#include <sys/param.h> 79 80#include <netinet/in.h> 81#include <arpa/inet.h> 82 83#include <ctype.h> 84 85#include "port_after.h" 86 87/*% 88 * Ascii internet address interpretation routine. 89 * The value returned is in network order. 90 */ 91in_addr_t /* XXX should be struct in_addr :( */ 92inet_addr(const char *cp) { 93 struct in_addr val; 94 95 if (inet_aton(cp, &val)) 96 return (val.s_addr); 97 return (INADDR_NONE); 98} 99 100/*% 101 * Check whether "cp" is a valid ascii representation 102 * of an Internet address and convert to a binary address. 103 * Returns 1 if the address is valid, 0 if not. 104 * This replaces inet_addr, the return value from which 105 * cannot distinguish between failure and a local broadcast address. 106 */ 107int 108inet_aton(const char *cp, struct in_addr *addr) { 109 u_long val; 110 int base, n; 111 char c; 112 u_int8_t parts[4]; 113 u_int8_t *pp = parts; 114 int digit; 115 116 c = *cp; 117 for (;;) { 118 /* 119 * Collect number up to ``.''. 120 * Values are specified as for C: 121 * 0x=hex, 0=octal, isdigit=decimal. 122 */ 123 if (!isdigit((unsigned char)c)) 124 return (0); 125 val = 0; base = 10; digit = 0; 126 if (c == '0') { 127 c = *++cp; 128 if (c == 'x' || c == 'X') 129 base = 16, c = *++cp; 130 else { 131 base = 8; 132 digit = 1 ; 133 } 134 } 135 for (;;) { 136 if (isascii(c) && isdigit((unsigned char)c)) { 137 if (base == 8 && (c == '8' || c == '9')) 138 return (0); 139 val = (val * base) + (c - '0'); 140 c = *++cp; 141 digit = 1; 142 } else if (base == 16 && isascii(c) && 143 isxdigit((unsigned char)c)) { 144 val = (val << 4) | 145 (c + 10 - (islower((unsigned char)c) ? 'a' : 'A')); 146 c = *++cp; 147 digit = 1; 148 } else 149 break; 150 } 151 if (c == '.') { 152 /* 153 * Internet format: 154 * a.b.c.d 155 * a.b.c (with c treated as 16 bits) 156 * a.b (with b treated as 24 bits) 157 */ 158 if (pp >= parts + 3 || val > 0xffU) 159 return (0); 160 *pp++ = val; 161 c = *++cp; 162 } else 163 break; 164 } 165 /* 166 * Check for trailing characters. 167 */ 168 if (c != '\0' && (!isascii(c) || !isspace((unsigned char)c))) 169 return (0); 170 /* 171 * Did we get a valid digit? 172 */ 173 if (!digit) 174 return (0); 175 /* 176 * Concoct the address according to 177 * the number of parts specified. 178 */ 179 n = pp - parts + 1; 180 switch (n) { 181 case 1: /*%< a -- 32 bits */ 182 break; 183 184 case 2: /*%< a.b -- 8.24 bits */ 185 if (val > 0xffffffU) 186 return (0); 187 val |= parts[0] << 24; 188 break; 189 190 case 3: /*%< a.b.c -- 8.8.16 bits */ 191 if (val > 0xffffU) 192 return (0); 193 val |= (parts[0] << 24) | (parts[1] << 16); 194 break; 195 196 case 4: /*%< a.b.c.d -- 8.8.8.8 bits */ 197 if (val > 0xffU) 198 return (0); 199 val |= (parts[0] << 24) | (parts[1] << 16) | (parts[2] << 8); 200 break; 201 } 202 if (addr != NULL) 203 addr->s_addr = htonl(val); 204 return (1); 205} 206 207/* 208 * Weak aliases for applications that use certain private entry points, 209 * and fail to include <arpa/inet.h>. 210 */ 211#undef inet_addr 212__weak_reference(__inet_addr, inet_addr); 213#undef inet_aton 214__weak_reference(__inet_aton, inet_aton); 215 216/*! \file */ 217