1 /* $FreeBSD$ */ 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 #if !defined(lint) 59 static const char sccsid[] = "@(#)inet_addr.c 8.1 (Berkeley) 6/17/93"; 60 static const char rcsid[] = "@(#)$Id: inet_addr.c,v 1.8.2.3 2004/12/09 19:41:20 darrenr Exp $"; 61 #endif /* LIBC_SCCS and not lint */ 62 63 #include <sys/param.h> 64 #include <netinet/in.h> 65 #include <arpa/inet.h> 66 #include <ctype.h> 67 68 #ifndef __P 69 # define __P(x) x 70 #endif 71 int inet_aton(const char *, struct in_addr *); 72 73 /* 74 * Because the ctype(3) posix definition, if used "safely" in code everywhere, 75 * would mean all normal code that walks through strings needed casts. Yuck. 76 */ 77 #define ISALNUM(x) isalnum((u_char)(x)) 78 #define ISALPHA(x) isalpha((u_char)(x)) 79 #define ISASCII(x) isascii((u_char)(x)) 80 #define ISDIGIT(x) isdigit((u_char)(x)) 81 #define ISPRINT(x) isprint((u_char)(x)) 82 #define ISSPACE(x) isspace((u_char)(x)) 83 #define ISUPPER(x) isupper((u_char)(x)) 84 #define ISXDIGIT(x) isxdigit((u_char)(x)) 85 #define ISLOWER(x) islower((u_char)(x)) 86 87 /* 88 * Check whether "cp" is a valid ascii representation 89 * of an Internet address and convert to a binary address. 90 * Returns 1 if the address is valid, 0 if not. 91 * This replaces inet_addr, the return value from which 92 * cannot distinguish between failure and a local broadcast address. 93 */ 94 int 95 inet_aton(register const char *cp, struct in_addr *addr) 96 { 97 register u_long val; 98 register int base, n; 99 register char c; 100 u_int parts[4]; 101 register u_int *pp = parts; 102 103 c = *cp; 104 for (;;) { 105 /* 106 * Collect number up to ``.''. 107 * Values are specified as for C: 108 * 0x=hex, 0=octal, isdigit=decimal. 109 */ 110 if (!ISDIGIT(c)) 111 return (0); 112 val = 0; base = 10; 113 if (c == '0') { 114 c = *++cp; 115 if (c == 'x' || c == 'X') 116 base = 16, c = *++cp; 117 else 118 base = 8; 119 } 120 for (;;) { 121 if (ISASCII(c) && ISDIGIT(c)) { 122 val = (val * base) + (c - '0'); 123 c = *++cp; 124 } else if (base == 16 && ISASCII(c) && ISXDIGIT(c)) { 125 val = (val << 4) | 126 (c + 10 - (ISLOWER(c) ? 'a' : 'A')); 127 c = *++cp; 128 } else 129 break; 130 } 131 if (c == '.') { 132 /* 133 * Internet format: 134 * a.b.c.d 135 * a.b.c (with c treated as 16 bits) 136 * a.b (with b treated as 24 bits) 137 */ 138 if (pp >= parts + 3) 139 return (0); 140 *pp++ = val; 141 c = *++cp; 142 } else 143 break; 144 } 145 /* 146 * Check for trailing characters. 147 */ 148 if (c != '\0' && (!ISASCII(c) || !ISSPACE(c))) 149 return (0); 150 /* 151 * Concoct the address according to 152 * the number of parts specified. 153 */ 154 n = pp - parts + 1; 155 switch (n) { 156 157 case 0: 158 return (0); /* initial nondigit */ 159 160 case 1: /* a -- 32 bits */ 161 break; 162 163 case 2: /* a.b -- 8.24 bits */ 164 if (val > 0xffffff) 165 return (0); 166 val |= parts[0] << 24; 167 break; 168 169 case 3: /* a.b.c -- 8.8.16 bits */ 170 if (val > 0xffff) 171 return (0); 172 val |= (parts[0] << 24) | (parts[1] << 16); 173 break; 174 175 case 4: /* a.b.c.d -- 8.8.8.8 bits */ 176 if (val > 0xff) 177 return (0); 178 val |= (parts[0] << 24) | (parts[1] << 16) | (parts[2] << 8); 179 break; 180 } 181 if (addr) 182 addr->s_addr = htonl(val); 183 return (1); 184 } 185 186 /* these are compatibility routines, not needed on recent BSD releases */ 187 188 /* 189 * Ascii internet address interpretation routine. 190 * The value returned is in network order. 191 */ 192 #if 0 193 inet_addr(const char *cp) 194 { 195 struct in_addr val; 196 197 if (inet_aton(cp, &val)) 198 return (val.s_addr); 199 return (0xffffffff); 200 } 201 #endif 202