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 <netinet/in.h> 60 #include <arpa/inet.h> 61 #include <ctype.h> 62 63 #if 0 64 /* 65 * Ascii internet address interpretation routine. 66 * The value returned is in network order. 67 */ 68 in_addr_t 69 inet_addr(const char *cp) 70 { 71 struct in_addr val; 72 73 if (inet_aton(cp, &val)) 74 return (val.s_addr); 75 return (INADDR_NONE); 76 } 77 #endif 78 79 /* 80 * Check whether "cp" is a valid ascii representation 81 * of an Internet address and convert to a binary address. 82 * Returns 1 if the address is valid, 0 if not. 83 * This replaces inet_addr, the return value from which 84 * cannot distinguish between failure and a local broadcast address. 85 */ 86 int 87 inet_aton(const char *cp, struct in_addr *addr) 88 { 89 u_int32_t val; 90 int base, n; 91 char c; 92 u_int parts[4]; 93 u_int *pp = parts; 94 95 c = *cp; 96 for (;;) { 97 /* 98 * Collect number up to ``.''. 99 * Values are specified as for C: 100 * 0x=hex, 0=octal, isdigit=decimal. 101 */ 102 if (!isdigit(c)) 103 return (0); 104 val = 0; base = 10; 105 if (c == '0') { 106 c = *++cp; 107 if (c == 'x' || c == 'X') 108 base = 16, c = *++cp; 109 else 110 base = 8; 111 } 112 for (;;) { 113 if (isascii(c) && isdigit(c)) { 114 val = (val * base) + (c - '0'); 115 c = *++cp; 116 } else if (base == 16 && isascii(c) && isxdigit(c)) { 117 val = (val << 4) | 118 (c + 10 - (islower(c) ? 'a' : 'A')); 119 c = *++cp; 120 } else 121 break; 122 } 123 if (c == '.') { 124 /* 125 * Internet format: 126 * a.b.c.d 127 * a.b.c (with c treated as 16 bits) 128 * a.b (with b treated as 24 bits) 129 */ 130 if (pp >= parts + 3) 131 return (0); 132 *pp++ = val; 133 c = *++cp; 134 } else 135 break; 136 } 137 /* 138 * Check for trailing characters. 139 */ 140 if (c != '\0' && (!isascii(c) || !isspace(c))) 141 return (0); 142 /* 143 * Concoct the address according to 144 * the number of parts specified. 145 */ 146 n = pp - parts + 1; 147 switch (n) { 148 149 case 0: 150 return (0); /* initial nondigit */ 151 152 case 1: /* a -- 32 bits */ 153 break; 154 155 case 2: /* a.b -- 8.24 bits */ 156 if ((val > 0xffffff) || (parts[0] > 0xff)) 157 return (0); 158 val |= parts[0] << 24; 159 break; 160 161 case 3: /* a.b.c -- 8.8.16 bits */ 162 if ((val > 0xffff) || (parts[0] > 0xff) || (parts[1] > 0xff)) 163 return (0); 164 val |= (parts[0] << 24) | (parts[1] << 16); 165 break; 166 167 case 4: /* a.b.c.d -- 8.8.8.8 bits */ 168 if ((val > 0xff) || (parts[0] > 0xff) || (parts[1] > 0xff) || (parts[2] > 0xff)) 169 return (0); 170 val |= (parts[0] << 24) | (parts[1] << 16) | (parts[2] << 8); 171 break; 172 } 173 if (addr) 174 addr->s_addr = htonl(val); 175 return (1); 176 } 177 178 #endif /* !defined(HAVE_INET_ATON) */ 179