1 /* $OpenBSD: inet_addr.c,v 1.6 1999/05/03 22:31:14 yanick Exp $ */ 2 3 /* 4 * ++Copyright++ 1983, 1990, 1993 5 * - 6 * Copyright (c) 1983, 1990, 1993 7 * The Regents of the University of California. All rights reserved. 8 * 9 * Redistribution and use in source and binary forms, with or without 10 * modification, are permitted provided that the following conditions 11 * are met: 12 * 1. Redistributions of source code must retain the above copyright 13 * notice, this list of conditions and the following disclaimer. 14 * 2. Redistributions in binary form must reproduce the above copyright 15 * notice, this list of conditions and the following disclaimer in the 16 * documentation and/or other materials provided with the distribution. 17 * 3. All advertising materials mentioning features or use of this software 18 * must display the following acknowledgement: 19 * This product includes software developed by the University of 20 * California, Berkeley and its contributors. 21 * 4. Neither the name of the University nor the names of its contributors 22 * may be used to endorse or promote products derived from this software 23 * without specific prior written permission. 24 * 25 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 26 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 27 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 28 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 29 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 30 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 31 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 32 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 33 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 34 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 35 * SUCH DAMAGE. 36 * - 37 * Portions Copyright (c) 1993 by Digital Equipment Corporation. 38 * 39 * Permission to use, copy, modify, and distribute this software for any 40 * purpose with or without fee is hereby granted, provided that the above 41 * copyright notice and this permission notice appear in all copies, and that 42 * the name of Digital Equipment Corporation not be used in advertising or 43 * publicity pertaining to distribution of the document or software without 44 * specific, written prior permission. 45 * 46 * THE SOFTWARE IS PROVIDED "AS IS" AND DIGITAL EQUIPMENT CORP. DISCLAIMS ALL 47 * WARRANTIES WITH REGARD TO THIS SOFTWARE, INCLUDING ALL IMPLIED WARRANTIES 48 * OF MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL DIGITAL EQUIPMENT 49 * CORPORATION BE LIABLE FOR ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL 50 * DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR 51 * PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS 52 * ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS 53 * SOFTWARE. 54 * - 55 * --Copyright-- 56 */ 57 58 #include "includes.h" 59 60 #if !defined(HAVE_INET_ATON) 61 62 #if defined(LIBC_SCCS) && !defined(lint) 63 #if 0 64 static char sccsid[] = "@(#)inet_addr.c 8.1 (Berkeley) 6/17/93"; 65 static char rcsid[] = "$From: inet_addr.c,v 8.5 1996/08/05 08:31:35 vixie Exp $"; 66 #else 67 static char rcsid[] = "$OpenBSD: inet_addr.c,v 1.6 1999/05/03 22:31:14 yanick Exp $"; 68 #endif 69 #endif /* LIBC_SCCS and not lint */ 70 71 #include <sys/types.h> 72 #include <sys/param.h> 73 #include <netinet/in.h> 74 #include <arpa/inet.h> 75 #include <ctype.h> 76 77 #if 0 78 /* 79 * Ascii internet address interpretation routine. 80 * The value returned is in network order. 81 */ 82 in_addr_t 83 inet_addr(cp) 84 register const char *cp; 85 { 86 struct in_addr val; 87 88 if (inet_aton(cp, &val)) 89 return (val.s_addr); 90 return (INADDR_NONE); 91 } 92 #endif 93 94 /* 95 * Check whether "cp" is a valid ascii representation 96 * of an Internet address and convert to a binary address. 97 * Returns 1 if the address is valid, 0 if not. 98 * This replaces inet_addr, the return value from which 99 * cannot distinguish between failure and a local broadcast address. 100 */ 101 int 102 inet_aton(const char *cp, struct in_addr *addr) 103 { 104 register u_int32_t val; 105 register int base, n; 106 register char c; 107 unsigned int parts[4]; 108 register unsigned int *pp = parts; 109 110 c = *cp; 111 for (;;) { 112 /* 113 * Collect number up to ``.''. 114 * Values are specified as for C: 115 * 0x=hex, 0=octal, isdigit=decimal. 116 */ 117 if (!isdigit(c)) 118 return (0); 119 val = 0; base = 10; 120 if (c == '0') { 121 c = *++cp; 122 if (c == 'x' || c == 'X') 123 base = 16, c = *++cp; 124 else 125 base = 8; 126 } 127 for (;;) { 128 if (isascii(c) && isdigit(c)) { 129 val = (val * base) + (c - '0'); 130 c = *++cp; 131 } else if (base == 16 && isascii(c) && isxdigit(c)) { 132 val = (val << 4) | 133 (c + 10 - (islower(c) ? 'a' : 'A')); 134 c = *++cp; 135 } else 136 break; 137 } 138 if (c == '.') { 139 /* 140 * Internet format: 141 * a.b.c.d 142 * a.b.c (with c treated as 16 bits) 143 * a.b (with b treated as 24 bits) 144 */ 145 if (pp >= parts + 3) 146 return (0); 147 *pp++ = val; 148 c = *++cp; 149 } else 150 break; 151 } 152 /* 153 * Check for trailing characters. 154 */ 155 if (c != '\0' && (!isascii(c) || !isspace(c))) 156 return (0); 157 /* 158 * Concoct the address according to 159 * the number of parts specified. 160 */ 161 n = pp - parts + 1; 162 switch (n) { 163 164 case 0: 165 return (0); /* initial nondigit */ 166 167 case 1: /* a -- 32 bits */ 168 break; 169 170 case 2: /* a.b -- 8.24 bits */ 171 if ((val > 0xffffff) || (parts[0] > 0xff)) 172 return (0); 173 val |= parts[0] << 24; 174 break; 175 176 case 3: /* a.b.c -- 8.8.16 bits */ 177 if ((val > 0xffff) || (parts[0] > 0xff) || (parts[1] > 0xff)) 178 return (0); 179 val |= (parts[0] << 24) | (parts[1] << 16); 180 break; 181 182 case 4: /* a.b.c.d -- 8.8.8.8 bits */ 183 if ((val > 0xff) || (parts[0] > 0xff) || (parts[1] > 0xff) || (parts[2] > 0xff)) 184 return (0); 185 val |= (parts[0] << 24) | (parts[1] << 16) | (parts[2] << 8); 186 break; 187 } 188 if (addr) 189 addr->s_addr = htonl(val); 190 return (1); 191 } 192 193 #endif /* !defined(HAVE_INET_ATON) */ 194 195 #pragma ident "%Z%%M% %I% %E% SMI" 196