1 /*- 2 * SPDX-License-Identifier: BSD-3-Clause 3 * 4 * Copyright (c) 1983, 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 32 #include "port_before.h" 33 34 #include <sys/types.h> 35 #include <netinet/in.h> 36 #include <arpa/inet.h> 37 #include <ctype.h> 38 39 #include "port_after.h" 40 41 /*% 42 * Internet network address interpretation routine. 43 * The library routines call this routine to interpret 44 * network numbers. 45 */ 46 in_addr_t 47 inet_network(const char *cp) 48 { 49 in_addr_t val, base, n; 50 char c; 51 in_addr_t parts[4], *pp = parts; 52 int i, digit; 53 54 again: 55 val = 0; base = 10; digit = 0; 56 if (*cp == '0') 57 digit = 1, base = 8, cp++; 58 if (*cp == 'x' || *cp == 'X') 59 base = 16, cp++; 60 while ((c = *cp) != 0) { 61 if (isdigit((unsigned char)c)) { 62 if (base == 8U && (c == '8' || c == '9')) 63 return (INADDR_NONE); 64 val = (val * base) + (c - '0'); 65 cp++; 66 digit = 1; 67 continue; 68 } 69 if (base == 16U && isxdigit((unsigned char)c)) { 70 val = (val << 4) + 71 (c + 10 - (islower((unsigned char)c) ? 'a' : 'A')); 72 cp++; 73 digit = 1; 74 continue; 75 } 76 break; 77 } 78 if (!digit) 79 return (INADDR_NONE); 80 if (pp >= parts + 4 || val > 0xffU) 81 return (INADDR_NONE); 82 if (*cp == '.') { 83 *pp++ = val, cp++; 84 goto again; 85 } 86 if (*cp && !isspace(*cp&0xff)) 87 return (INADDR_NONE); 88 *pp++ = val; 89 n = pp - parts; 90 if (n > 4U) 91 return (INADDR_NONE); 92 for (val = 0, i = 0; i < n; i++) { 93 val <<= 8; 94 val |= parts[i] & 0xff; 95 } 96 return (val); 97 } 98 99 /* 100 * Weak aliases for applications that use certain private entry points, 101 * and fail to include <arpa/inet.h>. 102 */ 103 #undef inet_network 104 __weak_reference(__inet_network, inet_network); 105 106 /*! \file */ 107