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406 lines
9.9 KiB
406 lines
9.9 KiB
/*
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* Copyright (C) 2002 - 2004 Tomasz Kojm <tkojm@clamav.net>
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* Damien Curtain <damien@pagefault.org>
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
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*/
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#if HAVE_CONFIG_H
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#include "clamav-config.h"
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#endif
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#include <stdio.h>
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#include <stdlib.h>
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#include <unistd.h>
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#include <string.h>
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#include <errno.h>
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#include <signal.h>
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#include <sys/types.h>
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#include <sys/stat.h>
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#include <fcntl.h>
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#include <pwd.h>
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#include <grp.h>
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#if defined(CLAMD_USE_SYSLOG) && !defined(C_AIX)
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#include <syslog.h>
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#endif
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#include "options.h"
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#include "shared.h"
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#include "others.h"
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#include "clamd/others.h"
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#include "manager.h"
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#include "defaults.h"
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#include "freshclam.h"
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static short terminate = 0;
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static void daemon_sighandler(int sig) {
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char *action = NULL;
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switch(sig) {
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case SIGUSR1:
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action = "wake up";
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terminate = -1;
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break;
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case SIGHUP:
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action = "re-opening log file";
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break;
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default:
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action = "terminating";
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terminate = 1;
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break;
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}
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logg("Received signal %d, %s\n", sig, action);
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if (sig == SIGHUP) {
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logg(NULL); /* forces log file re-opening */
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}
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return;
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}
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static void writepid(char *pidfile) {
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FILE *fd;
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int old_umask;
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old_umask = umask(0006);
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if((fd = fopen(pidfile, "w")) == NULL) {
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logg("!Can't save PID to file %s: %s\n", pidfile, strerror(errno));
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} else {
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fprintf(fd, "%d", (int) getpid());
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fclose(fd);
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}
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umask(old_umask);
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}
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int freshclam(struct optstruct *opt)
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{
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int ret = 52;
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char *newdir, *cfgfile;
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char *pidfile = NULL;
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struct cfgstruct *copt, *cpt;
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struct sigaction sigact;
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struct sigaction oldact;
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#ifndef C_CYGWIN
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char *unpuser;
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struct passwd *user;
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#endif
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struct stat statbuf;
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if(optc(opt, 'h')) {
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free_opt(opt);
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help();
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}
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/* parse the config file */
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if((cfgfile = getargl(opt, "config-file"))) {
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copt = parsecfg(cfgfile);
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} else {
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/* TODO: force strict permissions on freshclam.conf */
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if((copt = parsecfg((cfgfile = CONFDIR"/freshclam.conf"))) == NULL)
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copt = parsecfg((cfgfile = CONFDIR"/clamav.conf"));
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}
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if(!copt) {
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mprintf("!Can't parse the config file %s\n", cfgfile);
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return 56;
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}
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if(optl(opt, "http-proxy") || optl(opt, "proxy-user"))
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mprintf("WARNING: Proxy settings are now only configurable in the config file.\n");
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if(cfgopt(copt, "HTTPProxyPassword")) {
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if(stat(cfgfile, &statbuf) == -1) {
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mprintf("@Can't stat %s (critical error)\n");
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return 56;
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}
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if(statbuf.st_mode & (S_IRGRP | S_IWGRP | S_IXGRP | S_IROTH | S_IWOTH | S_IXOTH)) {
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mprintf("@Insecure permissions (for HTTPProxyPassword): %s must have no more than 0700 permissions.\n", cfgfile);
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return 56;
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}
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}
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#ifndef C_CYGWIN
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/* freshclam shouldn't work with root privileges */
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if(optc(opt, 'u')) {
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unpuser = getargc(opt, 'u');
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} else if((cpt = cfgopt(copt, "DatabaseOwner"))) {
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unpuser = cpt->strarg;
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} else {
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unpuser = UNPUSER;
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}
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if(!getuid()) {
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if((user = getpwnam(unpuser)) == NULL) {
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mprintf("@Can't get information about user %s.\n", unpuser);
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exit(60); /* this is critical problem, so we just exit here */
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}
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setgroups(1, &user->pw_gid);
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setgid(user->pw_gid);
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setuid(user->pw_uid);
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}
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#endif
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/* initialize some important variables */
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if(optl(opt, "debug") || cfgopt(copt, "Debug"))
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cl_debug();
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mprintf_disabled = 0;
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if(optc(opt, 'v')) mprintf_verbose = 1;
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else mprintf_verbose = 0;
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if(optl(opt, "quiet")) mprintf_quiet = 1;
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else mprintf_quiet = 0;
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if(optl(opt, "stdout")) mprintf_stdout = 1;
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else mprintf_stdout = 0;
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if(optc(opt, 'V')) {
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mprintf("freshclam / ClamAV version "VERSION"\n");
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mexit(0);
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}
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/* initialize logger */
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if(cfgopt(copt, "LogVerbose"))
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logverbose = 1;
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else
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logverbose = 0;
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if(optc(opt, 'l')) {
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logfile = getargc(opt, 'l');
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if(logg("--------------------------------------\n")) {
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mprintf("!Problem with internal logger.\n");
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mexit(1);
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}
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} else if((cpt = cfgopt(copt, "UpdateLogFile"))) {
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logfile = cpt->strarg;
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if(logg("--------------------------------------\n")) {
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mprintf("!Problem with internal logger.\n");
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mexit(1);
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}
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} else
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logfile = NULL;
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#if defined(CLAMD_USE_SYSLOG) && !defined(C_AIX)
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if((cpt = cfgopt(copt, "LogSyslog"))) {
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openlog("freshclam", LOG_PID, LOG_LOCAL6);
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use_syslog = 1;
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syslog(LOG_INFO, "Freshclam started.\n");
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} else
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use_syslog = 0;
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#endif
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/* change the current working directory */
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if(optl(opt, "datadir")) {
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newdir = getargl(opt, "datadir");
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} else {
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if((cpt = cfgopt(copt, "DatabaseDirectory")))
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newdir = cpt->strarg;
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else
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newdir = VIRUSDBDIR;
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}
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if(chdir(newdir)) {
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mprintf("Can't change dir to %s\n", newdir);
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exit(50);
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} else
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mprintf("*Current working dir is %s\n", newdir);
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if(optc(opt, 'd')) {
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int bigsleep, checks;
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time_t now, wakeup;
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memset(&sigact, 0, sizeof(struct sigaction));
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sigact.sa_handler = daemon_sighandler;
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if(optc(opt, 'c')) {
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checks = atoi(getargc(opt, 'c'));
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} else if((cpt = cfgopt(copt, "Checks"))) {
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checks = cpt->numarg;
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} else {
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checks = CL_DEFAULT_CHECKS;
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}
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if(checks <= 0 || checks > 50) {
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mprintf("@Number of checks must be between 1 and 50.\n");
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mexit(41);
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}
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bigsleep = 24 * 3600 / checks;
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daemonize();
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if (optc(opt, 'p')) {
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pidfile = getargc(opt, 'p');
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} else if ((cpt = cfgopt(copt, "PidFile"))) {
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pidfile = cpt->strarg;
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}
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if (pidfile) {
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writepid(pidfile);
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}
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logg("freshclam daemon started (pid=%d)\n", getpid());
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sigaction(SIGTERM, &sigact, NULL);
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sigaction(SIGHUP, &sigact, NULL);
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sigaction(SIGINT, &sigact, NULL);
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while(!terminate) {
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ret = download(copt, opt);
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if(optl(opt, "on-error-execute")) {
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if(ret > 1)
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system(getargl(opt, "on-error-execute"));
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} else if((cpt = cfgopt(copt, "OnErrorExecute"))) {
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if(ret > 1)
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system(cpt->strarg);
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}
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logg("\n--------------------------------------\n");
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sigaction(SIGALRM, &sigact, &oldact);
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sigaction(SIGUSR1, &sigact, &oldact);
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time(&wakeup);
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wakeup += bigsleep;
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alarm(bigsleep);
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do {
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pause();
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time(&now);
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} while (!terminate && now < wakeup);
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if (terminate == -1) {
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terminate = 0;
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}
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sigaction(SIGALRM, &oldact, NULL);
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sigaction(SIGUSR1, &oldact, NULL);
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}
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} else
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ret = download(copt, opt);
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if(optl(opt, "on-error-execute")) {
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if(ret > 1)
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system(getargl(opt, "on-error-execute"));
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} else if((cpt = cfgopt(copt, "OnErrorExecute"))) {
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if(ret > 1)
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system(cpt->strarg);
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}
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if (pidfile) {
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unlink(pidfile);
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}
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return(ret);
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}
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int download(const struct cfgstruct *copt, const struct optstruct *opt)
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{
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int ret = 0, try = 0, maxattempts = 0;
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struct cfgstruct *cpt;
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if((cpt = cfgopt(copt, "MaxAttempts")))
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maxattempts = cpt->numarg;
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mprintf("*Max retries == %d\n", maxattempts);
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if((cpt = cfgopt(copt, "DatabaseMirror")) == NULL) {
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mprintf("@You must specify at least one database mirror.\n");
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return 56;
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} else {
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while(cpt) {
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ret = downloadmanager(copt, opt, cpt->strarg);
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alarm(0);
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if(ret == 52 || ret == 54) {
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if(try < maxattempts - 1) {
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mprintf("Trying again...\n");
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logg("Trying again...\n");
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try++;
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sleep(1);
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continue;
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} else {
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mprintf("Giving up...\n");
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logg("Giving up...\n");
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cpt = (struct cfgstruct *) cpt->nextarg;
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try = 0;
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}
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} else {
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return ret;
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}
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}
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}
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return ret;
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}
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void daemonize(void)
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{
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int i;
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for(i = 0; i < 3; i++)
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close(i);
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umask(0);
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if(fork())
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exit(0);
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setsid();
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mprintf_disabled = 1;
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}
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void help(void)
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{
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mprintf_stdout = 1;
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mprintf("\n");
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mprintf(" Clam AntiVirus: freshclam "VERSION"\n");
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mprintf(" (C) 2002 - 2004 Tomasz Kojm <tkojm@clamav.net>\n\n");
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mprintf(" --help -h show help\n");
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mprintf(" --version -V print version number and exit\n");
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mprintf(" --verbose -v be verbose\n");
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mprintf(" --debug enable debug messages\n");
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mprintf(" --quiet be quiet, output only error messages\n");
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mprintf(" --stdout write to stdout instead of stderr\n");
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mprintf(" (this help is always written to stdout)\n");
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mprintf("\n");
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mprintf(" --config-file=FILE read configuration from FILE.\n");
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mprintf(" --log=FILE -l FILE log into FILE\n");
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mprintf(" --daemon -d run in daemon mode\n");
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mprintf(" --pid=FILE -p FILE save daemon's pid in FILE\n");
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mprintf(" --user=USER -u USER run as USER\n");
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mprintf(" --checks=#n -c #n number of checks per day, 1 <= n <= 50\n");
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mprintf(" --datadir=DIRECTORY download new databases into DIRECTORY\n");
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#ifdef BUILD_CLAMD
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mprintf(" --daemon-notify[=/path/clamav.conf] send RELOAD command to clamd\n");
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#endif
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mprintf(" --on-update-execute=COMMAND execute COMMAND after successful update\n");
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mprintf(" --on-error-execute=COMMAND execute COMMAND if errors occured\n");
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mprintf("\n");
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exit(0);
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}
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