/*
* 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., 51 Franklin Street, Fifth Floor, Boston,
* MA 02110-1301, 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 "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;
short foreground = 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, virnum = 0, tcpsock = 0, localsock = 0;
int lsockets[2], nlsockets = 0;
unsigned int dboptions = 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 = CONFDIR"/clamd.conf";
if((copt = getcfg(cfgfile, 1)) == NULL) {
fprintf(stderr, "ERROR: Can't open/parse the config file %s\n", cfgfile);
exit(1);
}
umask(0);
/* drop privileges */
#ifndef C_OS2
if(geteuid() == 0 && (cpt = cfgopt(copt, "User"))->enabled) {
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")->enabled) {
#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", user->pw_name, user->pw_uid, user->pw_gid);
}
#endif
/* initialize logger */
logg_lock = cfgopt(copt, "LogFileUnlock")->enabled;
logg_time = cfgopt(copt, "LogTime")->enabled;
logok = cfgopt(copt, "LogClean")->enabled;
logg_size = cfgopt(copt, "LogFileMaxSize")->numarg;
logg_verbose = mprintf_verbose = cfgopt(copt, "LogVerbose")->enabled;
if(cfgopt(copt, "Debug")->enabled) /* enable debug messages in libclamav */
cl_debug();
if((cpt = cfgopt(copt, "LogFile"))->enabled) {
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")->enabled) {
int fac = LOG_LOCAL6;
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;
}
#endif
logg("clamd daemon "VERSION" (OS: "TARGET_OS_TYPE", ARCH: "TARGET_ARCH_TYPE", CPU: "TARGET_CPU_TYPE")\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")->enabled)
tcpsock = 1;
if(cfgopt(copt, "LocalSocket")->enabled)
localsock = 1;
if(!tcpsock && !localsock) {
fprintf(stderr, "ERROR: You must select server type (local/tcp).\n");
logg("!Please select server type (local/TCP).\n");
exit(1);
}
/* set the temporary dir */
if((cpt = cfgopt(copt, "TemporaryDirectory"))->enabled)
cl_settempdir(cpt->strarg, 0);
if(cfgopt(copt, "LeaveTemporaryFiles")->enabled)
cl_settempdir(NULL, 1);
/* load the database(s) */
dbdir = cfgopt(copt, "DatabaseDirectory")->strarg;
logg("Reading databases from %s\n", dbdir);
if(!cfgopt(copt, "DetectPhishing")->enabled) {
dboptions |= CL_DB_NOPHISHING;
logg("Not loading phishing signatures.\n");
}
if((ret = cl_load(dbdir, &root, &virnum, dboptions))) {
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")->enabled)
daemonize();
else
foreground = 1;
if(tcpsock)
lsockets[nlsockets++] = tcpserver(copt, root);
if(localsock)
lsockets[nlsockets++] = localserver(copt, root);
ret = acceptloop_th(lsockets, nlsockets, root, copt);
logg_close();
freecfg(copt);
}
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
}