/* cfuserid.c */

/* Copyright 1997-2000 by Eberhard Mattes <em-gw@windhager.de>
   Donated to the public domain.  No warranty.

   1997-01-04 Initial version
   1997-04-05 Reorganize library
   1997-07-24 Add prototype for mapuid()
   2000-04-29 set_userid_groupid()
   2000-05-27 Use config_arg_count() */

#include <stdlib.h>
#include <unistd.h>
#include <syslog.h>
#include <string.h>
#include <errno.h>
#include "firewall.h"
#include "libemfw.h"

/* firewall.h lacks some declarations. */

extern int mapuid (char *);

int libemfw_uid = -1;

int config_userid (Cfg *confp, int do_set)
{
  Cfg *cf;
  int uid;

  if ((cf = cfg_get ("userid", confp)) == (Cfg *)0) 
    return -1;
  config_arg_count (cf, 1);
  if ((uid = mapuid (cf->argv[0])) == -1)
    {
      syslog (LLEV, "fwtkcfgerr: cannot map %s to uid", cf->argv[0]);
      exit (1);
    }
  if (!do_set)
    libemfw_uid = uid;	/* do_fastdaemon() and set_userid_groupid() */
  else if (setuid (uid) != 0)
    {
      syslog (LLEV, "fwtksyserr: cannot setuid %d: %s", uid, strerror(errno));
      exit (1);
    }
  return uid;
}