1 /* $OpenBSD: getnetent.c,v 1.12 2006/01/17 15:37:58 millert Exp $ */ 2 /* 3 * Copyright (c) 1983, 1993 4 * The Regents of the University of California. All rights reserved. 5 * 6 * Redistribution and use in source and binary forms, with or without 7 * modification, are permitted provided that the following conditions 8 * are met: 9 * 1. Redistributions of source code must retain the above copyright 10 * notice, this list of conditions and the following disclaimer. 11 * 2. Redistributions in binary form must reproduce the above copyright 12 * notice, this list of conditions and the following disclaimer in the 13 * documentation and/or other materials provided with the distribution. 14 * 3. Neither the name of the University nor the names of its contributors 15 * may be used to endorse or promote products derived from this software 16 * without specific prior written permission. 17 * 18 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 19 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 20 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 21 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 22 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 23 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 24 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 25 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 26 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 27 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 28 * SUCH DAMAGE. 29 */ 30 31 #include <sys/param.h> 32 #include <sys/socket.h> 33 #include <netinet/in.h> 34 #include <arpa/inet.h> 35 #include <netdb.h> 36 #include <stdio.h> 37 #include <string.h> 38 39 #define MAXALIASES 35 40 41 static FILE *netf; 42 static char line[BUFSIZ+1]; 43 static struct netent net; 44 static char *net_aliases[MAXALIASES]; 45 int _net_stayopen; 46 47 void 48 setnetent(int f) 49 { 50 if (netf == NULL) 51 netf = fopen(_PATH_NETWORKS, "r" ); 52 else 53 rewind(netf); 54 _net_stayopen |= f; 55 } 56 57 void 58 endnetent(void) 59 { 60 if (netf) { 61 fclose(netf); 62 netf = NULL; 63 } 64 _net_stayopen = 0; 65 } 66 67 struct netent * 68 getnetent(void) 69 { 70 char *p, *cp, **q; 71 size_t len; 72 73 if (netf == NULL && (netf = fopen(_PATH_NETWORKS, "r" )) == NULL) 74 return (NULL); 75 again: 76 if ((p = fgetln(netf, &len)) == NULL) 77 return (NULL); 78 if (p[len-1] == '\n') 79 len--; 80 if (len >= sizeof(line) || len == 0) 81 goto again; 82 p = memcpy(line, p, len); 83 line[len] = '\0'; 84 if (*p == '#') 85 goto again; 86 if ((cp = strchr(p, '#')) != NULL) 87 *cp = '\0'; 88 net.n_name = p; 89 if (strlen(net.n_name) >= MAXHOSTNAMELEN-1) 90 net.n_name[MAXHOSTNAMELEN-1] = '\0'; 91 cp = strpbrk(p, " \t"); 92 if (cp == NULL) 93 goto again; 94 *cp++ = '\0'; 95 while (*cp == ' ' || *cp == '\t') 96 cp++; 97 p = strpbrk(cp, " \t"); 98 if (p != NULL) 99 *p++ = '\0'; 100 net.n_net = inet_network(cp); 101 net.n_addrtype = AF_INET; 102 q = net.n_aliases = net_aliases; 103 if (p != NULL) 104 cp = p; 105 while (cp && *cp) { 106 if (*cp == ' ' || *cp == '\t') { 107 cp++; 108 continue; 109 } 110 if (q < &net_aliases[MAXALIASES - 1]) { 111 *q++ = cp; 112 if (strlen(cp) >= MAXHOSTNAMELEN-1) 113 cp[MAXHOSTNAMELEN-1] = '\0'; 114 } 115 cp = strpbrk(cp, " \t"); 116 if (cp != NULL) 117 *cp++ = '\0'; 118 } 119 *q = NULL; 120 return (&net); 121 } 122