1 /* $NetBSD: getnetent.c,v 1.21 2012/03/20 17:44:18 matt Exp $ */ 2 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 * Portions Copyright (c) 1993 Carlos Leandro and Rui Salgueiro 32 * Dep. Matematica Universidade de Coimbra, Portugal, Europe 33 * 34 * Permission to use, copy, modify, and distribute this software for any 35 * purpose with or without fee is hereby granted, provided that the above 36 * copyright notice and this permission notice appear in all copies. 37 * 38 * from getnetent.c 1.1 (Coimbra) 93/06/02 39 */ 40 41 #include <sys/cdefs.h> 42 #if defined(LIBC_SCCS) && !defined(lint) 43 #if 0 44 static char sccsid[] = "@(#)getnetent.c 8.1 (Berkeley) 6/4/93"; 45 static char rcsid[] = "Id: getnetent.c,v 8.4 1997/06/01 20:34:37 vixie Exp "; 46 #else 47 __RCSID("$NetBSD: getnetent.c,v 1.21 2012/03/20 17:44:18 matt Exp $"); 48 #endif 49 #endif /* LIBC_SCCS and not lint */ 50 51 #include <sys/types.h> 52 #include <sys/socket.h> 53 #include <netinet/in.h> 54 #include <arpa/inet.h> 55 #include <netdb.h> 56 #include <stdio.h> 57 #include <string.h> 58 59 #ifdef __weak_alias 60 __weak_alias(endnetent,_endnetent) 61 __weak_alias(getnetent,_getnetent) 62 __weak_alias(setnetent,_setnetent) 63 #endif 64 65 #ifndef _PATH_NETWORKS 66 #define _PATH_NETWORKS "/etc/networks" 67 #endif 68 69 #define MAXALIASES 35 70 71 static FILE *netf; 72 static char line[BUFSIZ+1]; 73 static struct netent net; 74 static char *net_aliases[MAXALIASES]; 75 int _net_stayopen; 76 77 static void __setnetent(int); 78 static void __endnetent(void); 79 80 void 81 setnetent(int stayopen) 82 { 83 84 sethostent(stayopen); 85 __setnetent(stayopen); 86 } 87 88 void 89 endnetent(void) 90 { 91 92 endhostent(); 93 __endnetent(); 94 } 95 96 static void 97 __setnetent(int f) 98 { 99 100 if (netf == NULL) 101 netf = fopen(_PATH_NETWORKS, "re"); 102 else 103 rewind(netf); 104 _net_stayopen |= f; 105 } 106 107 static void 108 __endnetent(void) 109 { 110 111 if (netf) { 112 fclose(netf); 113 netf = NULL; 114 } 115 _net_stayopen = 0; 116 } 117 118 struct netent * 119 getnetent(void) 120 { 121 char *p; 122 register char *cp, **q; 123 124 if (netf == NULL && (netf = fopen(_PATH_NETWORKS, "re")) == NULL) 125 return (NULL); 126 #if (defined(__sparc__) && defined(_LP64)) || \ 127 defined(__alpha__) || \ 128 (defined(__i386__) && defined(_LP64)) || \ 129 (defined(__sh__) && defined(_LP64)) 130 net.__n_pad0 = 0; 131 #endif 132 again: 133 p = fgets(line, (int)sizeof line, netf); 134 if (p == NULL) 135 return (NULL); 136 if (*p == '#') 137 goto again; 138 cp = strpbrk(p, "#\n"); 139 if (cp == NULL) 140 goto again; 141 *cp = '\0'; 142 net.n_name = p; 143 cp = strpbrk(p, " \t"); 144 if (cp == NULL) 145 goto again; 146 *cp++ = '\0'; 147 while (*cp == ' ' || *cp == '\t') 148 cp++; 149 p = strpbrk(cp, " \t"); 150 if (p != NULL) 151 *p++ = '\0'; 152 net.n_net = inet_network(cp); 153 net.n_addrtype = AF_INET; 154 q = net.n_aliases = net_aliases; 155 if (p != NULL) { 156 cp = p; 157 while (cp && *cp) { 158 if (*cp == ' ' || *cp == '\t') { 159 cp++; 160 continue; 161 } 162 if (q < &net_aliases[MAXALIASES - 1]) 163 *q++ = cp; 164 cp = strpbrk(cp, " \t"); 165 if (cp != NULL) 166 *cp++ = '\0'; 167 } 168 } 169 *q = NULL; 170 return (&net); 171 } 172