getnetent.c revision 1.22
1/* $NetBSD: getnetent.c,v 1.22 2020/06/05 11:16:15 nia 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 44static char sccsid[] = "@(#)getnetent.c 8.1 (Berkeley) 6/4/93"; 45static char rcsid[] = "Id: getnetent.c,v 8.4 1997/06/01 20:34:37 vixie Exp "; 46#else 47__RCSID("$NetBSD: getnetent.c,v 1.22 2020/06/05 11:16:15 nia 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 68static FILE *netf; 69static char line[BUFSIZ+1]; 70static struct netent net; 71static char *net_aliases[MAXALIASES]; 72int _net_stayopen; 73 74static void __setnetent(int); 75static void __endnetent(void); 76 77void 78setnetent(int stayopen) 79{ 80 81 sethostent(stayopen); 82 __setnetent(stayopen); 83} 84 85void 86endnetent(void) 87{ 88 89 endhostent(); 90 __endnetent(); 91} 92 93static void 94__setnetent(int f) 95{ 96 97 if (netf == NULL) 98 netf = fopen(_PATH_NETWORKS, "re"); 99 else 100 rewind(netf); 101 _net_stayopen |= f; 102} 103 104static void 105__endnetent(void) 106{ 107 108 if (netf) { 109 fclose(netf); 110 netf = NULL; 111 } 112 _net_stayopen = 0; 113} 114 115struct netent * 116getnetent(void) 117{ 118 char *p; 119 register char *cp, **q; 120 121 if (netf == NULL && (netf = fopen(_PATH_NETWORKS, "re")) == NULL) 122 return (NULL); 123#if (defined(__sparc__) && defined(_LP64)) || \ 124 defined(__alpha__) 125 net.__n_pad0 = 0; 126#endif 127again: 128 p = fgets(line, (int)sizeof line, netf); 129 if (p == NULL) 130 return (NULL); 131 if (*p == '#') 132 goto again; 133 cp = strpbrk(p, "#\n"); 134 if (cp == NULL) 135 goto again; 136 *cp = '\0'; 137 net.n_name = p; 138 cp = strpbrk(p, " \t"); 139 if (cp == NULL) 140 goto again; 141 *cp++ = '\0'; 142 while (*cp == ' ' || *cp == '\t') 143 cp++; 144 p = strpbrk(cp, " \t"); 145 if (p != NULL) 146 *p++ = '\0'; 147 net.n_net = inet_network(cp); 148 net.n_addrtype = AF_INET; 149 q = net.n_aliases = net_aliases; 150 if (p != NULL) { 151 cp = p; 152 while (cp && *cp) { 153 if (*cp == ' ' || *cp == '\t') { 154 cp++; 155 continue; 156 } 157 if (q < &net_aliases[MAXALIASES - 1]) 158 *q++ = cp; 159 cp = strpbrk(cp, " \t"); 160 if (cp != NULL) 161 *cp++ = '\0'; 162 } 163 } 164 *q = NULL; 165 return (&net); 166} 167