1 2 /* 3 * ++Copyright++ 1983, 1990, 1993 4 * - 5 * Copyright (c) 1983, 1990, 1993 6 * The Regents of the University of California. All rights reserved. 7 * 8 * Redistribution and use in source and binary forms, with or without 9 * modification, are permitted provided that the following conditions 10 * are met: 11 * 1. Redistributions of source code must retain the above copyright 12 * notice, this list of conditions and the following disclaimer. 13 * 2. Redistributions in binary form must reproduce the above copyright 14 * notice, this list of conditions and the following disclaimer in the 15 * documentation and/or other materials provided with the distribution. 16 * 3. All advertising materials mentioning features or use of this software 17 * must display the following acknowledgement: 18 * This product includes software developed by the University of 19 * California, Berkeley and its contributors. 20 * 4. Neither the name of the University nor the names of its contributors 21 * may be used to endorse or promote products derived from this software 22 * without specific prior written permission. 23 * 24 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 25 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 26 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 27 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 28 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 29 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 30 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 31 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 32 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 33 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 34 * SUCH DAMAGE. 35 * - 36 * Portions Copyright (c) 1993 by Digital Equipment Corporation. 37 * 38 * Permission to use, copy, modify, and distribute this software for any 39 * purpose with or without fee is hereby granted, provided that the above 40 * copyright notice and this permission notice appear in all copies, and that 41 * the name of Digital Equipment Corporation not be used in advertising or 42 * publicity pertaining to distribution of the document or software without 43 * specific, written prior permission. 44 * 45 * THE SOFTWARE IS PROVIDED "AS IS" AND DIGITAL EQUIPMENT CORP. DISCLAIMS ALL 46 * WARRANTIES WITH REGARD TO THIS SOFTWARE, INCLUDING ALL IMPLIED WARRANTIES 47 * OF MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL DIGITAL EQUIPMENT 48 * CORPORATION BE LIABLE FOR ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL 49 * DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR 50 * PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS 51 * ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS 52 * SOFTWARE. 53 * - 54 * --Copyright-- 55 */ 56 57 58 #include <sys/param.h> 59 #include <netinet/in.h> 60 #include <arpa/inet.h> 61 #include <ctype.h> 62 63 #ifndef __P 64 # define __P(x) x 65 #endif 66 int inet_aton(const char *, struct in_addr *); 67 68 /* 69 * Because the ctype(3) posix definition, if used "safely" in code everywhere, 70 * would mean all normal code that walks through strings needed casts. Yuck. 71 */ 72 #define ISALNUM(x) isalnum((u_char)(x)) 73 #define ISALPHA(x) isalpha((u_char)(x)) 74 #define ISASCII(x) isascii((u_char)(x)) 75 #define ISDIGIT(x) isdigit((u_char)(x)) 76 #define ISPRINT(x) isprint((u_char)(x)) 77 #define ISSPACE(x) isspace((u_char)(x)) 78 #define ISUPPER(x) isupper((u_char)(x)) 79 #define ISXDIGIT(x) isxdigit((u_char)(x)) 80 #define ISLOWER(x) islower((u_char)(x)) 81 82 /* 83 * Check whether "cp" is a valid ascii representation 84 * of an Internet address and convert to a binary address. 85 * Returns 1 if the address is valid, 0 if not. 86 * This replaces inet_addr, the return value from which 87 * cannot distinguish between failure and a local broadcast address. 88 */ 89 int 90 inet_aton(register const char *cp, struct in_addr *addr) 91 { 92 register u_long val; 93 register int base, n; 94 register char c; 95 u_int parts[4]; 96 register u_int *pp = parts; 97 98 c = *cp; 99 for (;;) { 100 /* 101 * Collect number up to ``.''. 102 * Values are specified as for C: 103 * 0x=hex, 0=octal, isdigit=decimal. 104 */ 105 if (!ISDIGIT(c)) 106 return (0); 107 val = 0; base = 10; 108 if (c == '0') { 109 c = *++cp; 110 if (c == 'x' || c == 'X') 111 base = 16, c = *++cp; 112 else 113 base = 8; 114 } 115 for (;;) { 116 if (ISASCII(c) && ISDIGIT(c)) { 117 val = (val * base) + (c - '0'); 118 c = *++cp; 119 } else if (base == 16 && ISASCII(c) && ISXDIGIT(c)) { 120 val = (val << 4) | 121 (c + 10 - (ISLOWER(c) ? 'a' : 'A')); 122 c = *++cp; 123 } else 124 break; 125 } 126 if (c == '.') { 127 /* 128 * Internet format: 129 * a.b.c.d 130 * a.b.c (with c treated as 16 bits) 131 * a.b (with b treated as 24 bits) 132 */ 133 if (pp >= parts + 3) 134 return (0); 135 *pp++ = val; 136 c = *++cp; 137 } else 138 break; 139 } 140 /* 141 * Check for trailing characters. 142 */ 143 if (c != '\0' && (!ISASCII(c) || !ISSPACE(c))) 144 return (0); 145 /* 146 * Concoct the address according to 147 * the number of parts specified. 148 */ 149 n = pp - parts + 1; 150 switch (n) { 151 152 case 0: 153 return (0); /* initial nondigit */ 154 155 case 1: /* a -- 32 bits */ 156 break; 157 158 case 2: /* a.b -- 8.24 bits */ 159 if (val > 0xffffff) 160 return (0); 161 val |= parts[0] << 24; 162 break; 163 164 case 3: /* a.b.c -- 8.8.16 bits */ 165 if (val > 0xffff) 166 return (0); 167 val |= (parts[0] << 24) | (parts[1] << 16); 168 break; 169 170 case 4: /* a.b.c.d -- 8.8.8.8 bits */ 171 if (val > 0xff) 172 return (0); 173 val |= (parts[0] << 24) | (parts[1] << 16) | (parts[2] << 8); 174 break; 175 } 176 if (addr) 177 addr->s_addr = htonl(val); 178 return (1); 179 } 180 181 /* these are compatibility routines, not needed on recent BSD releases */ 182 183 /* 184 * Ascii internet address interpretation routine. 185 * The value returned is in network order. 186 */ 187 #if 0 188 inet_addr(const char *cp) 189 { 190 struct in_addr val; 191 192 if (inet_aton(cp, &val)) 193 return (val.s_addr); 194 return (0xffffffff); 195 } 196 #endif 197