1 /* $NetBSD: getnetent.c,v 1.18 2007/01/27 22:27:35 christos 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 1.18 2007/01/27 22:27:35 christos Exp $"); 48 #endif 49 #endif /* LIBC_SCCS and not lint */ 50 51 #include "namespace.h" 52 #include <sys/types.h> 53 #include <sys/socket.h> 54 #include <netinet/in.h> 55 #include <arpa/inet.h> 56 #include <netdb.h> 57 #include <stdio.h> 58 #include <string.h> 59 60 #ifdef __weak_alias 61 __weak_alias(endnetent,_endnetent) 62 __weak_alias(getnetent,_getnetent) 63 __weak_alias(setnetent,_setnetent) 64 #endif 65 66 #define MAXALIASES 35 67 68 static FILE *netf; 69 static char line[BUFSIZ+1]; 70 static struct netent net; 71 static char *net_aliases[MAXALIASES]; 72 int _net_stayopen; 73 74 static void __setnetent __P((int)); 75 static void __endnetent __P((void)); 76 77 void 78 setnetent(stayopen) 79 int stayopen; 80 { 81 82 sethostent(stayopen); 83 __setnetent(stayopen); 84 } 85 86 void 87 endnetent() 88 { 89 90 endhostent(); 91 __endnetent(); 92 } 93 94 static void 95 __setnetent(f) 96 int f; 97 { 98 99 if (netf == NULL) 100 netf = fopen(_PATH_NETWORKS, "r" ); 101 else 102 rewind(netf); 103 _net_stayopen |= f; 104 } 105 106 static void 107 __endnetent() 108 { 109 110 if (netf) { 111 fclose(netf); 112 netf = NULL; 113 } 114 _net_stayopen = 0; 115 } 116 117 struct netent * 118 getnetent() 119 { 120 char *p; 121 register char *cp, **q; 122 123 if (netf == NULL && (netf = fopen(_PATH_NETWORKS, "r" )) == NULL) 124 return (NULL); 125 #if (defined(__sparc__) && defined(_LP64)) || \ 126 defined(__alpha__) || \ 127 (defined(__i386__) && defined(_LP64)) || \ 128 (defined(__sh__) && defined(_LP64)) 129 net.__n_pad0 = 0; 130 #endif 131 again: 132 p = fgets(line, sizeof line, netf); 133 if (p == NULL) 134 return (NULL); 135 if (*p == '#') 136 goto again; 137 cp = strpbrk(p, "#\n"); 138 if (cp == NULL) 139 goto again; 140 *cp = '\0'; 141 net.n_name = p; 142 cp = strpbrk(p, " \t"); 143 if (cp == NULL) 144 goto again; 145 *cp++ = '\0'; 146 while (*cp == ' ' || *cp == '\t') 147 cp++; 148 p = strpbrk(cp, " \t"); 149 if (p != NULL) 150 *p++ = '\0'; 151 net.n_net = inet_network(cp); 152 net.n_addrtype = AF_INET; 153 q = net.n_aliases = net_aliases; 154 if (p != NULL) { 155 cp = p; 156 while (cp && *cp) { 157 if (*cp == ' ' || *cp == '\t') { 158 cp++; 159 continue; 160 } 161 if (q < &net_aliases[MAXALIASES - 1]) 162 *q++ = cp; 163 cp = strpbrk(cp, " \t"); 164 if (cp != NULL) 165 *cp++ = '\0'; 166 } 167 } 168 *q = NULL; 169 return (&net); 170 } 171