getnetent.c revision 1.1
1/* 2 * Copyright (c) 1983 Regents of the University of California. 3 * 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. All advertising materials mentioning features or use of this software 14 * must display the following acknowledgement: 15 * This product includes software developed by the University of 16 * California, Berkeley and its contributors. 17 * 4. Neither the name of the University nor the names of its contributors 18 * may be used to endorse or promote products derived from this software 19 * without specific prior written permission. 20 * 21 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 22 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 23 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 24 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 25 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 26 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 27 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 28 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 29 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 30 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 31 * SUCH DAMAGE. 32 */ 33 34#if defined(LIBC_SCCS) && !defined(lint) 35static char sccsid[] = "@(#)getnetent.c 5.8 (Berkeley) 2/24/91"; 36#endif /* LIBC_SCCS and not lint */ 37 38#include <sys/types.h> 39#include <sys/socket.h> 40#include <netinet/in.h> 41#include <arpa/inet.h> 42#include <netdb.h> 43#include <stdio.h> 44#include <string.h> 45 46#define MAXALIASES 35 47 48static FILE *netf; 49static char line[BUFSIZ+1]; 50static struct netent net; 51static char *net_aliases[MAXALIASES]; 52int _net_stayopen; 53 54void 55setnetent(f) 56 int f; 57{ 58 if (netf == NULL) 59 netf = fopen(_PATH_NETWORKS, "r" ); 60 else 61 rewind(netf); 62 _net_stayopen |= f; 63} 64 65void 66endnetent() 67{ 68 if (netf) { 69 fclose(netf); 70 netf = NULL; 71 } 72 _net_stayopen = 0; 73} 74 75struct netent * 76getnetent() 77{ 78 char *p; 79 register char *cp, **q; 80 81 if (netf == NULL && (netf = fopen(_PATH_NETWORKS, "r" )) == NULL) 82 return (NULL); 83again: 84 p = fgets(line, BUFSIZ, netf); 85 if (p == NULL) 86 return (NULL); 87 if (*p == '#') 88 goto again; 89 cp = strpbrk(p, "#\n"); 90 if (cp == NULL) 91 goto again; 92 *cp = '\0'; 93 net.n_name = p; 94 cp = strpbrk(p, " \t"); 95 if (cp == NULL) 96 goto again; 97 *cp++ = '\0'; 98 while (*cp == ' ' || *cp == '\t') 99 cp++; 100 p = strpbrk(cp, " \t"); 101 if (p != NULL) 102 *p++ = '\0'; 103 net.n_net = inet_network(cp); 104 net.n_addrtype = AF_INET; 105 q = net.n_aliases = net_aliases; 106 if (p != NULL) 107 cp = p; 108 while (cp && *cp) { 109 if (*cp == ' ' || *cp == '\t') { 110 cp++; 111 continue; 112 } 113 if (q < &net_aliases[MAXALIASES - 1]) 114 *q++ = cp; 115 cp = strpbrk(cp, " \t"); 116 if (cp != NULL) 117 *cp++ = '\0'; 118 } 119 *q = NULL; 120 return (&net); 121} 122