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 * @(#)inet_addr.c 8.1 (Berkeley) 6/17/93 67 * $Id: inet_addr.c,v 1.5 2005/04/27 04:56:19 sra Exp $ 68 */ 69 70 #include "port_before.h" 71 72 #include <sys/types.h> 73 #include <sys/param.h> 74 75 #include <netinet/in.h> 76 #include <arpa/inet.h> 77 78 #include <ctype.h> 79 80 #include "port_after.h" 81 82 /*% 83 * Ascii internet address interpretation routine. 84 * The value returned is in network order. 85 */ 86 in_addr_t 87 inet_addr(const char *cp) { 88 struct in_addr val; 89 90 if (inet_aton(cp, &val)) 91 return (val.s_addr); 92 return (INADDR_NONE); 93 } 94 95 /*% 96 * Check whether "cp" is a valid ascii representation 97 * of an Internet address and convert to a binary address. 98 * Returns 1 if the address is valid, 0 if not. 99 * This replaces inet_addr, the return value from which 100 * cannot distinguish between failure and a local broadcast address. 101 */ 102 int 103 inet_aton(const char *cp, struct in_addr *addr) { 104 u_long val; 105 int base, n; 106 char c; 107 u_int8_t parts[4]; 108 u_int8_t *pp = parts; 109 int digit; 110 111 c = *cp; 112 for (;;) { 113 /* 114 * Collect number up to ``.''. 115 * Values are specified as for C: 116 * 0x=hex, 0=octal, isdigit=decimal. 117 */ 118 if (!isdigit((unsigned char)c)) 119 return (0); 120 val = 0; base = 10; digit = 0; 121 if (c == '0') { 122 c = *++cp; 123 if (c == 'x' || c == 'X') 124 base = 16, c = *++cp; 125 else { 126 base = 8; 127 digit = 1 ; 128 } 129 } 130 for (;;) { 131 if (isascii(c) && isdigit((unsigned char)c)) { 132 if (base == 8 && (c == '8' || c == '9')) 133 return (0); 134 val = (val * base) + (c - '0'); 135 c = *++cp; 136 digit = 1; 137 } else if (base == 16 && isascii(c) && 138 isxdigit((unsigned char)c)) { 139 val = (val << 4) | 140 (c + 10 - (islower((unsigned char)c) ? 'a' : 'A')); 141 c = *++cp; 142 digit = 1; 143 } else 144 break; 145 } 146 if (c == '.') { 147 /* 148 * Internet format: 149 * a.b.c.d 150 * a.b.c (with c treated as 16 bits) 151 * a.b (with b treated as 24 bits) 152 */ 153 if (pp >= parts + 3 || val > 0xffU) 154 return (0); 155 *pp++ = val; 156 c = *++cp; 157 } else 158 break; 159 } 160 /* 161 * Check for trailing characters. 162 */ 163 if (c != '\0' && (!isascii(c) || !isspace((unsigned char)c))) 164 return (0); 165 /* 166 * Did we get a valid digit? 167 */ 168 if (!digit) 169 return (0); 170 /* 171 * Concoct the address according to 172 * the number of parts specified. 173 */ 174 n = pp - parts + 1; 175 switch (n) { 176 case 1: /*%< a -- 32 bits */ 177 break; 178 179 case 2: /*%< a.b -- 8.24 bits */ 180 if (val > 0xffffffU) 181 return (0); 182 val |= parts[0] << 24; 183 break; 184 185 case 3: /*%< a.b.c -- 8.8.16 bits */ 186 if (val > 0xffffU) 187 return (0); 188 val |= (parts[0] << 24) | (parts[1] << 16); 189 break; 190 191 case 4: /*%< a.b.c.d -- 8.8.8.8 bits */ 192 if (val > 0xffU) 193 return (0); 194 val |= (parts[0] << 24) | (parts[1] << 16) | (parts[2] << 8); 195 break; 196 } 197 if (addr != NULL) 198 addr->s_addr = htonl(val); 199 return (1); 200 } 201 202 /* 203 * Weak aliases for applications that use certain private entry points, 204 * and fail to include <arpa/inet.h>. 205 */ 206 #undef inet_addr 207 __weak_reference(__inet_addr, inet_addr); 208 #undef inet_aton 209 __weak_reference(__inet_aton, inet_aton); 210