1 /* $OpenBSD: inet_addr.c,v 1.9 2005/08/06 20:30:03 espie 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. 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 * Portions Copyright (c) 1993 by Digital Equipment Corporation. 32 * 33 * Permission to use, copy, modify, and distribute this software for any 34 * purpose with or without fee is hereby granted, provided that the above 35 * copyright notice and this permission notice appear in all copies, and that 36 * the name of Digital Equipment Corporation not be used in advertising or 37 * publicity pertaining to distribution of the document or software without 38 * specific, written prior permission. 39 * 40 * THE SOFTWARE IS PROVIDED "AS IS" AND DIGITAL EQUIPMENT CORP. DISCLAIMS ALL 41 * WARRANTIES WITH REGARD TO THIS SOFTWARE, INCLUDING ALL IMPLIED WARRANTIES 42 * OF MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL DIGITAL EQUIPMENT 43 * CORPORATION BE LIABLE FOR ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL 44 * DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR 45 * PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS 46 * ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS 47 * SOFTWARE. 48 * - 49 * --Copyright-- 50 */ 51 52 /* OPENBSD ORIGINAL: lib/libc/net/inet_addr.c */ 53 54 #include "includes.h" 55 56 #if !defined(HAVE_INET_ATON) 57 58 #include <sys/types.h> 59 #include <sys/param.h> 60 #include <netinet/in.h> 61 #include <arpa/inet.h> 62 #include <ctype.h> 63 64 #if 0 65 /* 66 * Ascii internet address interpretation routine. 67 * The value returned is in network order. 68 */ 69 in_addr_t 70 inet_addr(const char *cp) 71 { 72 struct in_addr val; 73 74 if (inet_aton(cp, &val)) 75 return (val.s_addr); 76 return (INADDR_NONE); 77 } 78 #endif 79 80 /* 81 * Check whether "cp" is a valid ascii representation 82 * of an Internet address and convert to a binary address. 83 * Returns 1 if the address is valid, 0 if not. 84 * This replaces inet_addr, the return value from which 85 * cannot distinguish between failure and a local broadcast address. 86 */ 87 int 88 inet_aton(const char *cp, struct in_addr *addr) 89 { 90 u_int32_t val; 91 int base, n; 92 char c; 93 u_int parts[4]; 94 u_int *pp = parts; 95 96 c = *cp; 97 for (;;) { 98 /* 99 * Collect number up to ``.''. 100 * Values are specified as for C: 101 * 0x=hex, 0=octal, isdigit=decimal. 102 */ 103 if (!isdigit(c)) 104 return (0); 105 val = 0; base = 10; 106 if (c == '0') { 107 c = *++cp; 108 if (c == 'x' || c == 'X') 109 base = 16, c = *++cp; 110 else 111 base = 8; 112 } 113 for (;;) { 114 if (isascii(c) && isdigit(c)) { 115 val = (val * base) + (c - '0'); 116 c = *++cp; 117 } else if (base == 16 && isascii(c) && isxdigit(c)) { 118 val = (val << 4) | 119 (c + 10 - (islower(c) ? 'a' : 'A')); 120 c = *++cp; 121 } else 122 break; 123 } 124 if (c == '.') { 125 /* 126 * Internet format: 127 * a.b.c.d 128 * a.b.c (with c treated as 16 bits) 129 * a.b (with b treated as 24 bits) 130 */ 131 if (pp >= parts + 3) 132 return (0); 133 *pp++ = val; 134 c = *++cp; 135 } else 136 break; 137 } 138 /* 139 * Check for trailing characters. 140 */ 141 if (c != '\0' && (!isascii(c) || !isspace(c))) 142 return (0); 143 /* 144 * Concoct the address according to 145 * the number of parts specified. 146 */ 147 n = pp - parts + 1; 148 switch (n) { 149 150 case 0: 151 return (0); /* initial nondigit */ 152 153 case 1: /* a -- 32 bits */ 154 break; 155 156 case 2: /* a.b -- 8.24 bits */ 157 if ((val > 0xffffff) || (parts[0] > 0xff)) 158 return (0); 159 val |= parts[0] << 24; 160 break; 161 162 case 3: /* a.b.c -- 8.8.16 bits */ 163 if ((val > 0xffff) || (parts[0] > 0xff) || (parts[1] > 0xff)) 164 return (0); 165 val |= (parts[0] << 24) | (parts[1] << 16); 166 break; 167 168 case 4: /* a.b.c.d -- 8.8.8.8 bits */ 169 if ((val > 0xff) || (parts[0] > 0xff) || (parts[1] > 0xff) || (parts[2] > 0xff)) 170 return (0); 171 val |= (parts[0] << 24) | (parts[1] << 16) | (parts[2] << 8); 172 break; 173 } 174 if (addr) 175 addr->s_addr = htonl(val); 176 return (1); 177 } 178 179 #endif /* !defined(HAVE_INET_ATON) */ 180