/*
  *  Copyright (C) 2002, 2003 Tomasz Kojm <zolw@konarski.edu.pl>
  *
  *  This program is free software; you can redistribute it and/or modify
  *  it under the terms of the GNU General Public License as published by
  *  the Free Software Foundation; either version 2 of the License, or
  *  (at your option) any later version.
  *
  *  This program is distributed in the hope that it will be useful,
  *  but WITHOUT ANY WARRANTY; without even the implied warranty of
  *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  *  GNU General Public License for more details.
  *
  *  You should have received a copy of the GNU General Public License
  *  along with this program; if not, write to the Free Software
  *  Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
  */
 
 #include <stdio.h>
 #include <stdlib.h>
 #include <unistd.h>
 #include <sys/time.h>
 #include <sys/types.h>
 #include <sys/stat.h>
 #include <time.h>
 #include <pwd.h>
 #include <grp.h>
 #include <clamav.h>
 
 #if defined(CLAMD_USE_SYSLOG) && !defined(C_AIX)
 #include <syslog.h>
 #endif
 
 #include "options.h"
 #include "cfgfile.h"
 #include "others.h"
 #include "tcpserver.h"
 #include "localserver.h"
 #include "others.h"
 #include "defaults.h"
 
 void help(void);
 void daemonize(void);
 
 void clamd(struct optstruct *opt)
 {
 	struct cfgstruct *copt, *cpt;
         struct passwd *user;
 	time_t currtime;
 	struct cl_node *root = NULL;
 	const char *dbdir, *cfgfile;

 	int ret, virnum = 0, tcpsock;

 
     /* initialize some important variables */
 
     if(optc(opt, 'V')) {
 	printf("clamd / ClamAV version "VERSION"\n");
 	exit(0);
     }
 
     if(optc(opt, 'h')) {
     	help();
     }
 
     /* parse the config file */
     if(optc(opt, 'c'))
 	cfgfile = getargc(opt, 'c');
     else
 	cfgfile = CL_DEFAULT_CFG;
 
     if((copt = parsecfg(cfgfile)) == NULL) {
 	fprintf(stderr, "ERROR: Can't parse the config file %s\n", cfgfile);
 	exit(1);
     }
 

     umask(0);
 

     /* initialize logger */
 
     if(cfgopt(copt, "LogFileUnlock"))
 	loglock = 0;
     else
 	loglock = 1;
 
     if(cfgopt(copt, "LogTime"))
 	logtime = 1;
     else
 	logtime = 0;
 
     if((cpt = cfgopt(copt, "LogFileMaxSize")))
 	logsize = cpt->numarg;
     else
 	logsize = CL_DEFAULT_LOGSIZE;
 

     if(cfgopt(copt, "Debug")) /* enable debug messages in libclamav */
 	cl_debug();
 

     if(cfgopt(copt, "LogVerbose"))
 	logverbose = 1;
     else
 	logverbose = 0;
 
     if((cpt = cfgopt(copt, "LogFile"))) {
 	logfile = cpt->strarg;
 	if(logfile[0] != '/') {
 	    fprintf(stderr, "ERROR: LogFile requires full path.\n");
 	    exit(1);
 	}
 	time(&currtime);
 	if(logg("+++ Started at %s", ctime(&currtime))) {
 	    fprintf(stderr, "ERROR: Problem with internal logger. Please check the permissions on the %s file.\n", logfile);
 	    exit(1);
 	}
     } else
 	logfile = NULL;
 
 
 #if defined(CLAMD_USE_SYSLOG) && !defined(C_AIX)
     if((cpt = cfgopt(copt, "LogSyslog"))) {
 	openlog("clamd", LOG_PID, LOG_LOCAL6);
 	use_syslog = 1;
 	syslog(LOG_INFO, "Daemon started.\n");
     } else
 	use_syslog = 0;
 #endif
 
 
     if(logsize)
 	logg("Log file size limited to %d bytes.\n", logsize);
     else
 	logg("Log file size limit disabled.\n");
 
     logg("*Verbose logging activated.\n");
 
 
     /* check socket type */
 
     if(cfgopt(copt, "TCPSocket") && cfgopt(copt, "LocalSocket")) {
 	fprintf(stderr, "ERROR: You can select one mode only (local/TCP).\n");
 	logg("!Two modes (local & TCP) selected.\n");
 	exit(1);
     } else if(cfgopt(copt, "TCPSocket")) {
 	tcpsock = 1;
     } else if(cfgopt(copt, "LocalSocket")) {
 	tcpsock = 0;
     } else {
 	fprintf(stderr, "ERROR: You must select server type (local/tcp).\n");
 	logg("!Please select server type (local/TCP).\n");
 	exit(1);
     }
 
     /* drop priviledges */
     if(getuid() == 0 && (cpt = cfgopt(copt, "User"))) {
 	if((user = getpwnam(cpt->strarg)) == NULL) {
 	    fprintf(stderr, "ERROR: Can't get information about user %s.\n", cpt->strarg);
 	    logg("!Can't get information about user %s.\n", cpt->strarg);
 	    exit(1);
 	}
 
 	if(cfgopt(copt, "AllowSupplementaryGroups")) {
 	    initgroups(cpt->strarg, user->pw_gid);
 	} else
 	    setgroups(1, &user->pw_gid);
 
 	setgid(user->pw_gid);
 	setuid(user->pw_uid);
 	logg("Running as user %s (UID %d, GID %d)\n", cpt->strarg, user->pw_uid, user->pw_gid);
     }
 
     /* load the database(s) */
 
     if((cpt = cfgopt(copt, "DataDirectory")))
 	dbdir = cpt->strarg;
     else
 	dbdir = cl_retdbdir();
 
     logg("Reading databases from %s\n", dbdir);
 
     if((ret = cl_loaddbdir(dbdir, &root, &virnum))) {

 	fprintf(stderr, "ERROR: %s\n", cl_strerror(ret));
 	logg("!%s\n", cl_strerror(ret));

 	exit(1);
     }
 
     if(!root) {
 	fprintf(stderr, "ERROR: Database initialization error.\n");
 	logg("!Database initialization error.\n");
 	exit(1);
     }
 
     logg("Protecting against %d viruses.\n", virnum);
     cl_buildtrie(root);
 
 
     /* fork into background */
     if(!cfgopt(copt, "Foreground"))
 	daemonize();
 

     if(tcpsock)
 	ret = tcpserver(opt, copt, root);
     else
 	ret = localserver(opt, copt, root);
 
 }
 
 void help(void)
 {
 
     printf("\n");

     printf("                           Clam AntiVirus Daemon "VERSION"\n");
     printf("                 (c) 2002, 2003 Tomasz Kojm <tkojm@clamav.net>\n\n");
 
     printf("    --help                   -h             Show this help.\n");
     printf("    --version                -V             Show version number.\n");
     printf("    --config-file=FILE       -c FILE        Read configuration from FILE.\n\n");

 
     exit(0);
 }
 
 void daemonize(void)
 {
 	int i;
 
     for(i = 0; i <= 2; i++)
 	close(i);
 
     chdir("/");
 
     if(fork())
 	exit(0);
 
     setsid();
 }