1 /* 2 * Copyright (c) 1983, 1993 3 * The Regents of the University of California. All rights reserved. 4 * 5 * Redistribution and use in source and binary forms, with or without 6 * modification, are permitted provided that the following conditions 7 * are met: 8 * 1. Redistributions of source code must retain the above copyright 9 * notice, this list of conditions and the following disclaimer. 10 * 2. Redistributions in binary form must reproduce the above copyright 11 * notice, this list of conditions and the following disclaimer in the 12 * documentation and/or other materials provided with the distribution. 13 * 3. Neither the name of the University nor the names of its contributors 14 * may be used to endorse or promote products derived from this software 15 * without specific prior written permission. 16 * 17 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 18 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 19 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 20 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 21 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 22 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 23 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 24 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 25 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 26 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 27 * SUCH DAMAGE. 28 */ 29 30 #if defined(LIBC_SCCS) && !defined(lint) 31 static char rcsid[] = "$OpenBSD: inet_network.c,v 1.8 2003/06/02 20:18:35 millert Exp $"; 32 #endif /* LIBC_SCCS and not lint */ 33 34 #include <sys/types.h> 35 #include <netinet/in.h> 36 #include <arpa/inet.h> 37 #include <ctype.h> 38 39 /* 40 * Internet network address interpretation routine. 41 * The library routines call this routine to interpret 42 * network numbers. 43 */ 44 in_addr_t 45 inet_network(cp) 46 register const char *cp; 47 { 48 register in_addr_t val, base, n; 49 register char c; 50 in_addr_t parts[4], *pp = parts; 51 register int i; 52 53 again: 54 val = 0; base = 10; 55 if (*cp == '0') 56 base = 8, cp++; 57 if (*cp == 'x' || *cp == 'X') 58 base = 16, cp++; 59 while ((c = *cp)) { 60 if (isdigit(c)) { 61 val = (val * base) + (c - '0'); 62 cp++; 63 continue; 64 } 65 if (base == 16 && isxdigit(c)) { 66 val = (val << 4) + (c + 10 - (islower(c) ? 'a' : 'A')); 67 cp++; 68 continue; 69 } 70 break; 71 } 72 if (*cp == '.') { 73 if (pp >= parts + 3) 74 return (INADDR_NONE); 75 *pp++ = val, cp++; 76 goto again; 77 } 78 if (*cp && !isspace(*cp)) 79 return (INADDR_NONE); 80 *pp++ = val; 81 n = pp - parts; 82 for (val = 0, i = 0; i < 4; i++) { 83 val <<= 8; 84 if (i < n) 85 val |= parts[i] & 0xff; 86 } 87 return (val); 88 } 89