Move definition of CONFFILE from resolv.h to here

[unix-history] / usr / src / lib / libc / net / res_init.c

/*
* Copyright (c) 1985 Regents of the University of California.
* All rights reserved.  The Berkeley software License Agreement
* specifies the terms and conditions for redistribution.
*/

#ifndef lint
static char sccsid[] = "@(#)res_init.c  5.4 (Berkeley) %G%";
#endif not lint

#include <sys/types.h>
#include <sys/socket.h>
#include <netinet/in.h>
#include <stdio.h>
#include <arpa/nameser.h>
#include <arpa/resolv.h>

/*
* Resolver configuration file. Contains the address of the
* inital name server to query and the default domain for
* non fully qualified domain names.
*/

#ifdef CONFFILE
char    *conffile = CONFFILE;
#else
char    *conffile = "/usr/local/lib/resolv.conf";
#endif

/*
* Resolver state default settings
*/
struct state _res = {
       90,
       2,
       RES_RECURSE|RES_DEFNAMES,
};

/*
* Read the configuration file for default settings.
* Return true if the name server address is initialized.
*/
res_init()
{
       FILE *fp;
       char buf[BUFSIZ], *cp;
       int n;
       extern u_long inet_addr();
       extern char *index(), *getenv();

       _res.options |= RES_INIT;
       _res.nsaddr.sin_family = AF_INET;
       _res.nsaddr.sin_addr.s_addr = INADDR_ANY;
       _res.nsaddr.sin_port = htons(NAMESERVER_PORT);

       /* first try reading the config file */
       if ((fp = fopen(conffile, "r")) != NULL) {
               if (fgets(_res.defdname, sizeof(_res.defdname), fp) == NULL)
                       _res.defdname[0] = '\0';
               else if ((cp = index(_res.defdname, '\n')) != NULL)
                       *cp = '\0';
               if (fgets(buf, sizeof (buf), fp) != NULL)
                       _res.nsaddr.sin_addr.s_addr = inet_addr(buf);
               (void) fclose(fp);
       }

       /* Allow user to override the local domain definition */
       if ((cp = getenv("LOCALDOMAIN")) != NULL)
               strncpy(_res.defdname, cp, sizeof(_res.defdname));
}