1 /* 2 * Copyright (c) 1983, 1993 3 * The Regents of the University of California. 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 rcsid[] = "$OpenBSD: getnetent.c,v 1.8 1998/03/16 05:06:57 millert Exp $"; 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 48 static FILE *netf; 49 static char line[BUFSIZ+1]; 50 static struct netent net; 51 static char *net_aliases[MAXALIASES]; 52 int _net_stayopen; 53 54 void 55 setnetent(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 65 void 66 endnetent() 67 { 68 if (netf) { 69 fclose(netf); 70 netf = NULL; 71 } 72 _net_stayopen = 0; 73 } 74 75 struct netent * 76 getnetent() 77 { 78 char *p, *cp, **q; 79 size_t len; 80 81 if (netf == NULL && (netf = fopen(_PATH_NETWORKS, "r" )) == NULL) 82 return (NULL); 83 again: 84 if ((p = fgetln(netf, &len)) == NULL) 85 return (NULL); 86 if (p[len-1] == '\n') 87 len--; 88 if (len >= sizeof(line) || len == 0) 89 goto again; 90 p = memcpy(line, p, len); 91 line[len] = '\0'; 92 if (*p == '#') 93 goto again; 94 if ((cp = strchr(p, '#')) != NULL) 95 *cp = '\0'; 96 net.n_name = p; 97 if (strlen(net.n_name) >= MAXHOSTNAMELEN-1) 98 net.n_name[MAXHOSTNAMELEN-1] = '\0'; 99 cp = strpbrk(p, " \t"); 100 if (cp == NULL) 101 goto again; 102 *cp++ = '\0'; 103 while (*cp == ' ' || *cp == '\t') 104 cp++; 105 p = strpbrk(cp, " \t"); 106 if (p != NULL) 107 *p++ = '\0'; 108 net.n_net = inet_network(cp); 109 net.n_addrtype = AF_INET; 110 q = net.n_aliases = net_aliases; 111 if (p != NULL) 112 cp = p; 113 while (cp && *cp) { 114 if (*cp == ' ' || *cp == '\t') { 115 cp++; 116 continue; 117 } 118 if (q < &net_aliases[MAXALIASES - 1]) { 119 *q++ = cp; 120 if (strlen(cp) >= MAXHOSTNAMELEN-1) 121 cp[MAXHOSTNAMELEN-1] = '\0'; 122 } 123 cp = strpbrk(cp, " \t"); 124 if (cp != NULL) 125 *cp++ = '\0'; 126 } 127 *q = NULL; 128 return (&net); 129 } 130