projects / unix-history / blame
| Commit | Line | Data |
|---|---|---|
| b53e7108 | 1 | #ifndef lint |
| b423e985 | 2 | static char sccsid[] = "@(#)res_init.c 4.4 (Berkeley) %G%"; |
| b53e7108 RC |
3 | #endif |
| 4 | ||
| b423e985 RC |
5 | /* |
| 6 | * Copyright (c) 1985 Regents of the University of California | |
| 7 | * All Rights Reserved | |
| 8 | */ | |
| 9 | ||
| b53e7108 RC |
10 | #include <sys/types.h> |
| 11 | #include <sys/socket.h> | |
| 12 | #include <netinet/in.h> | |
| 13 | #include <stdio.h> | |
| 14 | #include <nameser.h> | |
| 15 | #include <resolv.h> | |
| 16 | ||
| 17 | /* | |
| 18 | * Resolver state default settings | |
| 19 | */ | |
| 20 | struct state _res = { | |
| 21 | 90, | |
| 22 | 2, | |
| 23 | RES_RECURSE|RES_DEFNAMES, | |
| 24 | }; | |
| 25 | ||
| 26 | /* | |
| 27 | * Read the configuration file for default settings. | |
| 28 | * Return true if the name server address is initialized. | |
| 29 | */ | |
| 30 | res_init() | |
| 31 | { | |
| 32 | FILE *fp; | |
| 33 | char buf[BUFSIZ], *cp; | |
| 34 | int n; | |
| 35 | extern u_long inet_addr(); | |
| ae6e20b0 | 36 | extern char *index(), *getenv(); |
| b53e7108 RC |
37 | |
| 38 | _res.options |= RES_INIT; | |
| 39 | _res.nsaddr.sin_family = AF_INET; | |
| 40 | _res.nsaddr.sin_addr.s_addr = INADDR_ANY; | |
| ae6e20b0 | 41 | _res.nsaddr.sin_port = HTONS(NAMESERVER_PORT); |
| b53e7108 RC |
42 | |
| 43 | /* first try reading the config file */ | |
| 44 | if ((fp = fopen(CONFFILE, "r")) != NULL) { | |
| ae6e20b0 | 45 | if (fgets(_res.defdname, sizeof(_res.defdname), fp) == NULL) |
| b53e7108 RC |
46 | _res.defdname[0] = '\0'; |
| 47 | else if ((cp = index(_res.defdname, '\n')) != NULL) | |
| 48 | *cp = '\0'; | |
| ae6e20b0 | 49 | if (fgets(buf, sizeof (buf), fp) != NULL) |
| b53e7108 | 50 | _res.nsaddr.sin_addr.s_addr = inet_addr(buf); |
| b53e7108 RC |
51 | (void) fclose(fp); |
| 52 | } | |
| 53 | ||
| ae6e20b0 RC |
54 | /* Allow user to override the local domain definition */ |
| 55 | if ((cp = getenv("LOCALDOMAIN")) != NULL) | |
| 56 | strncpy(_res.defdname, cp, sizeof(_res.defdname)); | |
| b53e7108 | 57 | } |