inet_addr.c revision 156953
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. All advertising materials mentioning features or use of this software 14 * must display the following acknowledgement: 15 * This product includes software developed by the University of 16 * California, Berkeley and its contributors. 17 * 4. Neither the name of the University nor the names of its contributors 18 * may be used to endorse or promote products derived from this software 19 * without specific prior written permission. 20 * 21 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 22 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 23 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 24 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 25 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 26 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 27 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 28 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 29 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 30 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 31 * SUCH DAMAGE. 32 */ 33 34/* 35 * Portions Copyright (c) 1993 by Digital Equipment Corporation. 36 * 37 * Permission to use, copy, modify, and distribute this software for any 38 * purpose with or without fee is hereby granted, provided that the above 39 * copyright notice and this permission notice appear in all copies, and that 40 * the name of Digital Equipment Corporation not be used in advertising or 41 * publicity pertaining to distribution of the document or software without 42 * specific, written prior permission. 43 * 44 * THE SOFTWARE IS PROVIDED "AS IS" AND DIGITAL EQUIPMENT CORP. DISCLAIMS ALL 45 * WARRANTIES WITH REGARD TO THIS SOFTWARE, INCLUDING ALL IMPLIED WARRANTIES 46 * OF MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL DIGITAL EQUIPMENT 47 * CORPORATION BE LIABLE FOR ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL 48 * DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR 49 * PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS 50 * ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS 51 * SOFTWARE. 52 */ 53 54/* 55 * Copyright (c) 2004 by Internet Systems Consortium, Inc. ("ISC") 56 * Portions Copyright (c) 1996-1999 by Internet Software Consortium. 57 * 58 * Permission to use, copy, modify, and distribute this software for any 59 * purpose with or without fee is hereby granted, provided that the above 60 * copyright notice and this permission notice appear in all copies. 61 * 62 * THE SOFTWARE IS PROVIDED "AS IS" AND ISC DISCLAIMS ALL WARRANTIES 63 * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF 64 * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL ISC BE LIABLE FOR 65 * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES 66 * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN 67 * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT 68 * OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE. 69 */ 70 71#if defined(LIBC_SCCS) && !defined(lint) 72static const char sccsid[] = "@(#)inet_addr.c 8.1 (Berkeley) 6/17/93"; 73static const char rcsid[] = "$Id: inet_addr.c,v 1.2.206.2 2004/03/17 00:29:45 marka Exp $"; 74#endif /* LIBC_SCCS and not lint */ 75 76#include "port_before.h" 77 78#include <sys/types.h> 79#include <sys/param.h> 80 81#include <netinet/in.h> 82#include <arpa/inet.h> 83 84#include <ctype.h> 85 86#include "port_after.h" 87 88/* 89 * Ascii internet address interpretation routine. 90 * The value returned is in network order. 91 */ 92u_long 93inet_addr(const char *cp) { 94 struct in_addr val; 95 96 if (inet_aton(cp, &val)) 97 return (val.s_addr); 98 return (INADDR_NONE); 99} 100 101/* 102 * Check whether "cp" is a valid ascii representation 103 * of an Internet address and convert to a binary address. 104 * Returns 1 if the address is valid, 0 if not. 105 * This replaces inet_addr, the return value from which 106 * cannot distinguish between failure and a local broadcast address. 107 */ 108int 109inet_aton(const char *cp, struct in_addr *addr) { 110 u_long val; 111 int base, n; 112 char c; 113 u_int8_t parts[4]; 114 u_int8_t *pp = parts; 115 int digit; 116 117 c = *cp; 118 for (;;) { 119 /* 120 * Collect number up to ``.''. 121 * Values are specified as for C: 122 * 0x=hex, 0=octal, isdigit=decimal. 123 */ 124 if (!isdigit((unsigned char)c)) 125 return (0); 126 val = 0; base = 10; digit = 0; 127 if (c == '0') { 128 c = *++cp; 129 if (c == 'x' || c == 'X') 130 base = 16, c = *++cp; 131 else { 132 base = 8; 133 digit = 1 ; 134 } 135 } 136 for (;;) { 137 if (isascii(c) && isdigit((unsigned char)c)) { 138 if (base == 8 && (c == '8' || c == '9')) 139 return (0); 140 val = (val * base) + (c - '0'); 141 c = *++cp; 142 digit = 1; 143 } else if (base == 16 && isascii(c) && 144 isxdigit((unsigned char)c)) { 145 val = (val << 4) | 146 (c + 10 - (islower((unsigned char)c) ? 'a' : 'A')); 147 c = *++cp; 148 digit = 1; 149 } else 150 break; 151 } 152 if (c == '.') { 153 /* 154 * Internet format: 155 * a.b.c.d 156 * a.b.c (with c treated as 16 bits) 157 * a.b (with b treated as 24 bits) 158 */ 159 if (pp >= parts + 3 || val > 0xffU) 160 return (0); 161 *pp++ = val; 162 c = *++cp; 163 } else 164 break; 165 } 166 /* 167 * Check for trailing characters. 168 */ 169 if (c != '\0' && (!isascii(c) || !isspace((unsigned char)c))) 170 return (0); 171 /* 172 * Did we get a valid digit? 173 */ 174 if (!digit) 175 return (0); 176 /* 177 * Concoct the address according to 178 * the number of parts specified. 179 */ 180 n = pp - parts + 1; 181 switch (n) { 182 case 1: /* a -- 32 bits */ 183 break; 184 185 case 2: /* a.b -- 8.24 bits */ 186 if (val > 0xffffffU) 187 return (0); 188 val |= parts[0] << 24; 189 break; 190 191 case 3: /* a.b.c -- 8.8.16 bits */ 192 if (val > 0xffffU) 193 return (0); 194 val |= (parts[0] << 24) | (parts[1] << 16); 195 break; 196 197 case 4: /* a.b.c.d -- 8.8.8.8 bits */ 198 if (val > 0xffU) 199 return (0); 200 val |= (parts[0] << 24) | (parts[1] << 16) | (parts[2] << 8); 201 break; 202 } 203 if (addr != NULL) 204 addr->s_addr = htonl(val); 205 return (1); 206} 207