/*

  *  Copyright (C) 2002 - 2005 Tomasz Kojm <tkojm@clamav.net>

  *
  *  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.
  */
 

 #if HAVE_CONFIG_H
 #include "clamav-config.h"
 #endif
 

 #include <stdio.h>
 #include <stdlib.h>

 #include <string.h>

 #include <unistd.h>
 #include <sys/time.h>
 #include <sys/types.h>
 #include <sys/stat.h>

 #include <fcntl.h>

 #include <time.h>
 #include <pwd.h>
 #include <grp.h>
 #include <clamav.h>
 

 #if defined(USE_SYSLOG) && !defined(C_AIX)

 #include <syslog.h>
 #endif
 

 #ifdef C_LINUX
 #include <sys/resource.h>
 #endif
 

 #include "options.h"

 #include "cfgparser.h"

 #include "others.h"

 /* Fixes gcc warning */
 #include "../libclamav/others.h"

 #include "tcpserver.h"
 #include "localserver.h"
 #include "others.h"
 #include "defaults.h"

 #include "memory.h"
 #include "output.h"
 #include "shared.h"

 #include "target.h"

 #include "misc.h"

 void help(void);
 void daemonize(void);
 

 short debug_mode = 0, logok = 0;
 

 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, tcpsock;
 	unsigned int virnum = 0;

 #ifdef C_LINUX
 	struct stat sb;
 #endif

 
     /* initialize some important variables */
 
     if(optc(opt, 'V')) {

 	print_version();

 	exit(0);
     }
 
     if(optc(opt, 'h')) {
     	help();
     }
 

     if(optl(opt, "debug")) {
 #if defined(C_LINUX)
 	    /* njh@bandsman.co.uk: create a dump if needed */
 	    struct rlimit rlim;
 
 	rlim.rlim_cur = rlim.rlim_max = RLIM_INFINITY;
 	if(setrlimit(RLIMIT_CORE, &rlim) < 0)
 	    perror("setrlimit");
 #endif

 	debug_mode = 1;

 
     }

     /* parse the config file */
     if(optc(opt, 'c'))
 	cfgfile = getargc(opt, 'c');
     else
 	cfgfile = CL_DEFAULT_CFG;
 

     if((copt = parsecfg(cfgfile, 1)) == NULL) {

 	fprintf(stderr, "ERROR: Can't open/parse the config file %s\n", cfgfile);

 	exit(1);
     }
 

     umask(0);
 

     /* initialize logger */
 
     if(cfgopt(copt, "LogFileUnlock"))

 	logg_lock = 0;

 
     if(cfgopt(copt, "LogTime"))

 	logg_time = 1;

     if(cfgopt(copt, "LogClean"))
 	logok = 1;
 

     if((cpt = cfgopt(copt, "LogFileMaxSize")))

 	logg_size = cpt->numarg;

     else

 	logg_size = CL_DEFAULT_LOGSIZE;

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

     if(cfgopt(copt, "LogVerbose"))

 	logg_verbose = 1;

     else

 	logg_verbose = 0;

 
     if((cpt = cfgopt(copt, "LogFile"))) {

 	logg_file = cpt->strarg;

 	if(strlen(logg_file) < 2 || (logg_file[0] != '/' && logg_file[0] != '\\' && logg_file[1] != ':')) {

 	    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", logg_file);

 	    exit(1);
 	}
     } else

 	logg_file = NULL;

 #if defined(USE_SYSLOG) && !defined(C_AIX)

     if(cfgopt(copt, "LogSyslog")) {
 	    int fac = LOG_LOCAL6;
 
 	if((cpt = cfgopt(copt, "LogFacility"))) {
 	    if((fac = logg_facility(cpt->strarg)) == -1) {
 		fprintf(stderr, "ERROR: LogFacility: %s: No such facility.\n", cpt->strarg);
 		exit(1);
 	    }
 	}
 
 	openlog("clamd", LOG_PID, fac);

 	logg_syslog = 1;

 	syslog(LOG_INFO, "Daemon started.\n");

     }

 #endif
 

     logg("clamd daemon "VERSION" (OS: "TARGET_OS_TYPE", ARCH: "TARGET_ARCH_TYPE", CPU: "TARGET_CPU_TYPE")\n");
 

     if(strcmp(VERSION, cl_retver())) {
 	logg("WARNING: Version mismatch (clamd: "VERSION", libclamav: %s)\n", cl_retver());
 	logg("See the FAQ at http://www.clamav.net/faq.html\n");
     }
 

     if(logg_size)
 	logg("Log file size limited to %d bytes.\n", logg_size);

     else
 	logg("Log file size limit disabled.\n");
 
     logg("*Verbose logging activated.\n");
 

 #ifdef C_LINUX

     procdev = 0;
     if(stat("/proc", &sb) != -1 && !sb.st_size)

 	procdev = sb.st_dev;
 #endif

 
     /* 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 privileges */
 #ifndef C_OS2

     if(geteuid() == 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")) {

 #ifdef HAVE_INITGROUPS

 	    if(initgroups(cpt->strarg, user->pw_gid)) {
 		fprintf(stderr, "ERROR: initgroups() failed.\n");
 		logg("!initgroups() failed.\n");
 		exit(1);
 	    }

 #else
 	    logg("AllowSupplementaryGroups: initgroups() not supported.\n");
 #endif

 	} else {

 #ifdef HAVE_SETGROUPS

 	    if(setgroups(1, &user->pw_gid)) {
 		fprintf(stderr, "ERROR: setgroups() failed.\n");
 		logg("!setgroups() failed.\n");
 		exit(1);
 	    }

 #endif

 	}
 
 	if(setgid(user->pw_gid)) {
 	    fprintf(stderr, "ERROR: setgid(%d) failed.\n", (int) user->pw_gid);
 	    logg("!setgid(%d) failed.\n", (int) user->pw_gid);
 	    exit(1);
 	}
 
 	if(setuid(user->pw_uid)) {
 	    fprintf(stderr, "ERROR: setuid(%d) failed.\n", (int) user->pw_uid);
 	    logg("!setuid(%d) failed.\n", (int) user->pw_uid);
 	    exit(1);
 	}

 
 	logg("Running as user %s (UID %d, GID %d)\n", cpt->strarg, user->pw_uid, user->pw_gid);
     }

 #endif

     /* set the temporary dir */

     if((cpt = cfgopt(copt, "TemporaryDirectory")))
 	cl_settempdir(cpt->strarg, 0);
 
     if(cfgopt(copt, "LeaveTemporaryFiles"))
 	cl_settempdir(NULL, 1);

     /* load the database(s) */

     if((cpt = cfgopt(copt, "DatabaseDirectory")) || (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);

     if((ret = cl_build(root)) != 0) {

 	fprintf(stderr, "ERROR: Database initialization error: %s\n", cl_strerror(ret));;
 	logg("!Database initialization error: %s\n", cl_strerror(ret));;
 	exit(1);
     }

 
     /* fork into background */
     if(!cfgopt(copt, "Foreground"))
 	daemonize();
 
     if(tcpsock)
 	ret = tcpserver(opt, copt, root);
     else
 	ret = localserver(opt, copt, root);
 

     printf("server ended; result=%d\n", ret);

     logg_close();
     freecfg(copt);

     printf("free() copt\n");

 }
 
 void help(void)
 {
 
     printf("\n");

     printf("                      Clam AntiVirus Daemon "VERSION"\n");
     printf("    (C) 2002 - 2005 ClamAV Team - http://www.clamav.net/team.html\n\n");

 
     printf("    --help                   -h             Show this help.\n");
     printf("    --version                -V             Show version number.\n");

     printf("    --debug                                 Enable debug mode.\n");

     printf("    --config-file=FILE       -c FILE        Read configuration from FILE.\n\n");

 
     exit(0);
 }
 
 void daemonize(void)
 {
 	int i;
 

 #ifdef C_OS2
     return;
 #else
 

     if((i = open("/dev/null", O_WRONLY)) == -1) {
 	logg("!Cannot open /dev/null. Only use Debug if Foreground is enabled.\n");
 	for(i = 0; i <= 2; i++)
 	    close(i);
 
     } else {
 	close(0);
 	dup2(i, 1);
 	dup2(i, 2);
     }

     if(!debug_mode)
 	chdir("/");

 
     if(fork())
 	exit(0);
 
     setsid();

 #endif

 }