inet_addr.c revision 1.2
1 /* $NetBSD: inet_addr.c,v 1.2 2008/02/16 17:37:13 apb Exp $ */ 2 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. All advertising materials mentioning features or use of this software 16 * must display the following acknowledgement: 17 * This product includes software developed by the University of 18 * California, Berkeley and its contributors. 19 * 4. Neither the name of the University nor the names of its contributors 20 * may be used to endorse or promote products derived from this software 21 * without specific prior written permission. 22 * 23 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 24 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 25 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 26 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 27 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 28 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 29 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 30 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 31 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 32 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 33 * SUCH DAMAGE. 34 */ 35 36 /* 37 * Portions Copyright (c) 1993 by Digital Equipment Corporation. 38 * 39 * Permission to use, copy, modify, and distribute this software for any 40 * purpose with or without fee is hereby granted, provided that the above 41 * copyright notice and this permission notice appear in all copies, and that 42 * the name of Digital Equipment Corporation not be used in advertising or 43 * publicity pertaining to distribution of the document or software without 44 * specific, written prior permission. 45 * 46 * THE SOFTWARE IS PROVIDED "AS IS" AND DIGITAL EQUIPMENT CORP. DISCLAIMS ALL 47 * WARRANTIES WITH REGARD TO THIS SOFTWARE, INCLUDING ALL IMPLIED WARRANTIES 48 * OF MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL DIGITAL EQUIPMENT 49 * CORPORATION BE LIABLE FOR ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL 50 * DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR 51 * PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS 52 * ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS 53 * SOFTWARE. 54 */ 55 56 /* 57 * Copyright (c) 2004 by Internet Systems Consortium, Inc. ("ISC") 58 * Portions Copyright (c) 1996-1999 by Internet Software Consortium. 59 * 60 * Permission to use, copy, modify, and distribute this software for any 61 * purpose with or without fee is hereby granted, provided that the above 62 * copyright notice and this permission notice appear in all copies. 63 * 64 * THE SOFTWARE IS PROVIDED "AS IS" AND ISC DISCLAIMS ALL WARRANTIES 65 * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF 66 * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL ISC BE LIABLE FOR 67 * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES 68 * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN 69 * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT 70 * OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE. 71 */ 72 73 #if !defined(_KERNEL) && !defined(_STANDALONE) 74 #include <sys/cdefs.h> 75 #if defined(LIBC_SCCS) && !defined(lint) 76 #if 0 77 static const char sccsid[] = "@(#)inet_addr.c 8.1 (Berkeley) 6/17/93"; 78 static const char rcsid[] = "Id: inet_addr.c,v 1.2.206.2 2004/03/17 00:29:45 marka Exp"; 79 #else 80 __RCSID("$NetBSD: inet_addr.c,v 1.2 2008/02/16 17:37:13 apb Exp $"); 81 #endif 82 #endif /* LIBC_SCCS and not lint */ 83 84 #include "port_before.h" 85 86 #include "namespace.h" 87 #include <sys/types.h> 88 #include <sys/param.h> 89 90 #include <netinet/in.h> 91 #include <arpa/inet.h> 92 93 #include <ctype.h> 94 95 #include "port_after.h" 96 97 #ifdef __weak_alias 98 __weak_alias(inet_aton,_inet_aton) 99 #endif 100 #else 101 #include <lib/libkern/libkern.h> 102 #include <netinet/in.h> 103 #endif 104 105 /* 106 * Ascii internet address interpretation routine. 107 * The value returned is in network order. 108 */ 109 uint32_t 110 inet_addr(const char *cp) { 111 struct in_addr val; 112 113 if (inet_aton(cp, &val)) 114 return (val.s_addr); 115 return (INADDR_NONE); 116 } 117 118 /* 119 * Check whether "cp" is a valid ascii representation 120 * of an Internet address and convert to a binary address. 121 * Returns 1 if the address is valid, 0 if not. 122 * This replaces inet_addr, the return value from which 123 * cannot distinguish between failure and a local broadcast address. 124 */ 125 int 126 inet_aton(const char *cp, struct in_addr *addr) { 127 uint32_t val; 128 int base, n; 129 char c; 130 uint8_t parts[4]; 131 uint8_t *pp = parts; 132 int digit; 133 134 c = *cp; 135 for (;;) { 136 /* 137 * Collect number up to ``.''. 138 * Values are specified as for C: 139 * 0x=hex, 0=octal, isdigit=decimal. 140 */ 141 if (!isdigit((unsigned char)c)) 142 return (0); 143 val = 0; base = 10; digit = 0; 144 if (c == '0') { 145 c = *++cp; 146 if (c == 'x' || c == 'X') 147 base = 16, c = *++cp; 148 else { 149 base = 8; 150 digit = 1 ; 151 } 152 } 153 for (;;) { 154 if (isascii(c) && isdigit((unsigned char)c)) { 155 if (base == 8 && (c == '8' || c == '9')) 156 return (0); 157 val = (val * base) + (c - '0'); 158 c = *++cp; 159 digit = 1; 160 } else if (base == 16 && isascii(c) && 161 isxdigit((unsigned char)c)) { 162 val = (val << 4) | 163 (c + 10 - (islower((unsigned char)c) ? 'a' : 'A')); 164 c = *++cp; 165 digit = 1; 166 } else 167 break; 168 } 169 if (c == '.') { 170 /* 171 * Internet format: 172 * a.b.c.d 173 * a.b.c (with c treated as 16 bits) 174 * a.b (with b treated as 24 bits) 175 */ 176 if (pp >= parts + 3 || val > 0xffU) 177 return (0); 178 *pp++ = val; 179 c = *++cp; 180 } else 181 break; 182 } 183 /* 184 * Check for trailing characters. 185 */ 186 if (c != '\0' && (!isascii(c) || !isspace((unsigned char)c))) 187 return (0); 188 /* 189 * Did we get a valid digit? 190 */ 191 if (!digit) 192 return (0); 193 /* 194 * Concoct the address according to 195 * the number of parts specified. 196 */ 197 n = pp - parts + 1; 198 switch (n) { 199 case 1: /* a -- 32 bits */ 200 break; 201 202 case 2: /* a.b -- 8.24 bits */ 203 if (val > 0xffffffU) 204 return (0); 205 val |= parts[0] << 24; 206 break; 207 208 case 3: /* a.b.c -- 8.8.16 bits */ 209 if (val > 0xffffU) 210 return (0); 211 val |= (parts[0] << 24) | (parts[1] << 16); 212 break; 213 214 case 4: /* a.b.c.d -- 8.8.8.8 bits */ 215 if (val > 0xffU) 216 return (0); 217 val |= (parts[0] << 24) | (parts[1] << 16) | (parts[2] << 8); 218 break; 219 } 220 if (addr != NULL) 221 addr->s_addr = htonl(val); 222 return (1); 223 } 224
Indexes created Tue Sep 23 07:09:52 GMT 2025