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