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#include <sys/types.h> 70#include <sys/param.h> 71 72#include <netinet/in.h> 73#include <arpa/inet.h> 74 75#include <ctype.h> 76 77/*% 78 * Ascii internet address interpretation routine. 79 * The value returned is in network order. 80 */ 81in_addr_t 82inet_addr(const char *cp) { 83 struct in_addr val; 84 85 if (inet_aton(cp, &val)) 86 return (val.s_addr); 87 return (INADDR_NONE); 88} 89 90/*% 91 * Check whether "cp" is a valid ascii representation 92 * of an Internet address and convert to a binary address. 93 * Returns 1 if the address is valid, 0 if not. 94 * This replaces inet_addr, the return value from which 95 * cannot distinguish between failure and a local broadcast address. 96 */ 97int 98inet_aton(const char *cp, struct in_addr *addr) { 99 u_long val; 100 int base, n; 101 char c; 102 u_int8_t parts[4]; 103 u_int8_t *pp = parts; 104 int digit; 105 106 c = *cp; 107 for (;;) { 108 /* 109 * Collect number up to ``.''. 110 * Values are specified as for C: 111 * 0x=hex, 0=octal, isdigit=decimal. 112 */ 113 if (!isdigit((unsigned char)c)) 114 return (0); 115 val = 0; base = 10; digit = 0; 116 if (c == '0') { 117 c = *++cp; 118 if (c == 'x' || c == 'X') 119 base = 16, c = *++cp; 120 else { 121 base = 8; 122 digit = 1 ; 123 } 124 } 125 for (;;) { 126 if (isascii(c) && isdigit((unsigned char)c)) { 127 if (base == 8 && (c == '8' || c == '9')) 128 return (0); 129 val = (val * base) + (c - '0'); 130 c = *++cp; 131 digit = 1; 132 } else if (base == 16 && isascii(c) && 133 isxdigit((unsigned char)c)) { 134 val = (val << 4) | 135 (c + 10 - (islower((unsigned char)c) ? 'a' : 'A')); 136 c = *++cp; 137 digit = 1; 138 } else 139 break; 140 } 141 if (c == '.') { 142 /* 143 * Internet format: 144 * a.b.c.d 145 * a.b.c (with c treated as 16 bits) 146 * a.b (with b treated as 24 bits) 147 */ 148 if (pp >= parts + 3 || val > 0xffU) 149 return (0); 150 *pp++ = val; 151 c = *++cp; 152 } else 153 break; 154 } 155 /* 156 * Check for trailing characters. 157 */ 158 if (c != '\0' && (!isascii(c) || !isspace((unsigned char)c))) 159 return (0); 160 /* 161 * Did we get a valid digit? 162 */ 163 if (!digit) 164 return (0); 165 /* 166 * Concoct the address according to 167 * the number of parts specified. 168 */ 169 n = pp - parts + 1; 170 switch (n) { 171 case 1: /*%< a -- 32 bits */ 172 break; 173 174 case 2: /*%< a.b -- 8.24 bits */ 175 if (val > 0xffffffU) 176 return (0); 177 val |= (uint32_t)parts[0] << 24; 178 break; 179 180 case 3: /*%< a.b.c -- 8.8.16 bits */ 181 if (val > 0xffffU) 182 return (0); 183 val |= ((uint32_t)parts[0] << 24) | (parts[1] << 16); 184 break; 185 186 case 4: /*%< a.b.c.d -- 8.8.8.8 bits */ 187 if (val > 0xffU) 188 return (0); 189 val |= ((uint32_t)parts[0] << 24) | (parts[1] << 16) | 190 (parts[2] << 8); 191 break; 192 } 193 if (addr != NULL) 194 addr->s_addr = htonl(val); 195 return (1); 196} 197