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) 35 /*static char *sccsid = "from: @(#)getnetent.c 5.8 (Berkeley) 2/24/91";*/ 36 static char *rcsid = "$Id: getnetent.c,v 1.3 1993/08/26 00:45:53 jtc Exp $"; 37 #endif /* LIBC_SCCS and not lint */ 38 39 #include <sys/types.h> 40 #include <sys/socket.h> 41 #include <netinet/in.h> 42 #include <arpa/inet.h> 43 #include <netdb.h> 44 #include <stdio.h> 45 #include <string.h> 46 47 #define MAXALIASES 35 48 49 static FILE *netf; 50 static char line[BUFSIZ+1]; 51 static struct netent net; 52 static char *net_aliases[MAXALIASES]; 53 int _net_stayopen; 54 55 void 56 setnetent(f) 57 int f; 58 { 59 if (netf == NULL) 60 netf = fopen(_PATH_NETWORKS, "r" ); 61 else 62 rewind(netf); 63 _net_stayopen |= f; 64 } 65 66 void 67 endnetent() 68 { 69 if (netf) { 70 fclose(netf); 71 netf = NULL; 72 } 73 _net_stayopen = 0; 74 } 75 76 struct netent * 77 getnetent() 78 { 79 char *p; 80 register char *cp, **q; 81 82 if (netf == NULL && (netf = fopen(_PATH_NETWORKS, "r" )) == NULL) 83 return (NULL); 84 again: 85 p = fgets(line, BUFSIZ, netf); 86 if (p == NULL) 87 return (NULL); 88 if (*p == '#') 89 goto again; 90 cp = strpbrk(p, "#\n"); 91 if (cp == NULL) 92 goto again; 93 *cp = '\0'; 94 net.n_name = p; 95 cp = strpbrk(p, " \t"); 96 if (cp == NULL) 97 goto again; 98 *cp++ = '\0'; 99 while (*cp == ' ' || *cp == '\t') 100 cp++; 101 p = strpbrk(cp, " \t"); 102 if (p != NULL) 103 *p++ = '\0'; 104 net.n_net = inet_network(cp); 105 net.n_addrtype = AF_INET; 106 q = net.n_aliases = net_aliases; 107 if (p != NULL) 108 cp = p; 109 while (cp && *cp) { 110 if (*cp == ' ' || *cp == '\t') { 111 cp++; 112 continue; 113 } 114 if (q < &net_aliases[MAXALIASES - 1]) 115 *q++ = cp; 116 cp = strpbrk(cp, " \t"); 117 if (cp != NULL) 118 *cp++ = '\0'; 119 } 120 *q = NULL; 121 return (&net); 122 } 123