1 /* 2 * Copyright (c) 1985 Regents of the University of California. 3 * All rights reserved. The Berkeley software License Agreement 4 * specifies the terms and conditions for redistribution. 5 */ 6 7 #ifndef lint 8 static char sccsid[] = "@(#)res_init.c 5.1 (Berkeley) 05/30/85"; 9 #endif not lint 10 11 #include <sys/types.h> 12 #include <sys/socket.h> 13 #include <netinet/in.h> 14 #include <stdio.h> 15 #include <nameser.h> 16 #include <resolv.h> 17 18 /* 19 * Resolver state default settings 20 */ 21 struct state _res = { 22 90, 23 2, 24 RES_RECURSE|RES_DEFNAMES, 25 }; 26 27 /* 28 * Read the configuration file for default settings. 29 * Return true if the name server address is initialized. 30 */ 31 res_init() 32 { 33 FILE *fp; 34 char buf[BUFSIZ], *cp; 35 int n; 36 extern u_long inet_addr(); 37 extern char *index(), *getenv(); 38 39 _res.options |= RES_INIT; 40 _res.nsaddr.sin_family = AF_INET; 41 _res.nsaddr.sin_addr.s_addr = INADDR_ANY; 42 _res.nsaddr.sin_port = HTONS(NAMESERVER_PORT); 43 44 /* first try reading the config file */ 45 if ((fp = fopen(CONFFILE, "r")) != NULL) { 46 if (fgets(_res.defdname, sizeof(_res.defdname), fp) == NULL) 47 _res.defdname[0] = '\0'; 48 else if ((cp = index(_res.defdname, '\n')) != NULL) 49 *cp = '\0'; 50 if (fgets(buf, sizeof (buf), fp) != NULL) 51 _res.nsaddr.sin_addr.s_addr = inet_addr(buf); 52 (void) fclose(fp); 53 } 54 55 /* Allow user to override the local domain definition */ 56 if ((cp = getenv("LOCALDOMAIN")) != NULL) 57 strncpy(_res.defdname, cp, sizeof(_res.defdname)); 58 } 59