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 "port_before.h" 70 71 #include <sys/param.h> 72 73 #include <netinet/in.h> 74 #include <arpa/inet.h> 75 76 #include <ctype.h> 77 78 #include "port_after.h" 79 80 /*% 81 * Ascii internet address interpretation routine. 82 * The value returned is in network order. 83 */ 84 in_addr_t /* XXX should be struct in_addr :( */ 85 inet_addr(const char *cp) { 86 struct in_addr val; 87 88 if (inet_aton(cp, &val)) 89 return (val.s_addr); 90 return (INADDR_NONE); 91 } 92 93 /*% 94 * Check whether "cp" is a valid ascii representation 95 * of an Internet address and convert to a binary address. 96 * Returns 1 if the address is valid, 0 if not. 97 * This replaces inet_addr, the return value from which 98 * cannot distinguish between failure and a local broadcast address. 99 */ 100 int 101 inet_aton(const char *cp, struct in_addr *addr) { 102 u_long val; 103 int base, n; 104 char c; 105 u_int8_t parts[4]; 106 u_int8_t *pp = parts; 107 int digit; 108 109 c = *cp; 110 for (;;) { 111 /* 112 * Collect number up to ``.''. 113 * Values are specified as for C: 114 * 0x=hex, 0=octal, isdigit=decimal. 115 */ 116 if (!isdigit((unsigned char)c)) 117 return (0); 118 val = 0; base = 10; digit = 0; 119 if (c == '0') { 120 c = *++cp; 121 if (c == 'x' || c == 'X') 122 base = 16, c = *++cp; 123 else { 124 base = 8; 125 digit = 1 ; 126 } 127 } 128 for (;;) { 129 if (isascii(c) && isdigit((unsigned char)c)) { 130 if (base == 8 && (c == '8' || c == '9')) 131 return (0); 132 val = (val * base) + (c - '0'); 133 c = *++cp; 134 digit = 1; 135 } else if (base == 16 && isascii(c) && 136 isxdigit((unsigned char)c)) { 137 val = (val << 4) | 138 (c + 10 - (islower((unsigned char)c) ? 'a' : 'A')); 139 c = *++cp; 140 digit = 1; 141 } else 142 break; 143 } 144 if (c == '.') { 145 /* 146 * Internet format: 147 * a.b.c.d 148 * a.b.c (with c treated as 16 bits) 149 * a.b (with b treated as 24 bits) 150 */ 151 if (pp >= parts + 3 || val > 0xffU) 152 return (0); 153 *pp++ = val; 154 c = *++cp; 155 } else 156 break; 157 } 158 /* 159 * Check for trailing characters. 160 */ 161 if (c != '\0' && (!isascii(c) || !isspace((unsigned char)c))) 162 return (0); 163 /* 164 * Did we get a valid digit? 165 */ 166 if (!digit) 167 return (0); 168 /* 169 * Concoct the address according to 170 * the number of parts specified. 171 */ 172 n = pp - parts + 1; 173 switch (n) { 174 case 1: /*%< a -- 32 bits */ 175 break; 176 177 case 2: /*%< a.b -- 8.24 bits */ 178 if (val > 0xffffffU) 179 return (0); 180 val |= (uint32_t)parts[0] << 24; 181 break; 182 183 case 3: /*%< a.b.c -- 8.8.16 bits */ 184 if (val > 0xffffU) 185 return (0); 186 val |= ((uint32_t)parts[0] << 24) | (parts[1] << 16); 187 break; 188 189 case 4: /*%< a.b.c.d -- 8.8.8.8 bits */ 190 if (val > 0xffU) 191 return (0); 192 val |= ((uint32_t)parts[0] << 24) | (parts[1] << 16) | 193 (parts[2] << 8); 194 break; 195 } 196 if (addr != NULL) 197 addr->s_addr = htonl(val); 198 return (1); 199 } 200 201 /* 202 * Weak aliases for applications that use certain private entry points, 203 * and fail to include <arpa/inet.h>. 204 */ 205 #undef inet_addr 206 __weak_reference(__inet_addr, inet_addr); 207 #undef inet_aton 208 __weak_reference(__inet_aton, inet_aton); 209 210 /*! \file */ 211