inoclam.cxx

   1 /*
   2  * inoclam - Inotify+ClamAV virus scanner
   3  * Copyright (C) 2007 Vermont Department of Taxes
   4  *
   5  * This program is free software; you can redistribute it and/or modify
   6  * it under the terms of the GNU General Public License as published by
   7  * the Free Software Foundation; either version 2 of the License, or
   8  * (at your option) any later version.
   9  *
  10  * This program is distributed in the hope that it will be useful,
  11  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  12  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  13  * GNU General Public License for more details.
  14  *
  15  * You should have received a copy of the GNU General Public License
  16  * along with this program; if not, write to the Free Software
  17  * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
  18  *
  19  * Contributor(s):
  20  *   Tom Cort <tom.cort@state.vt.us>
  21  *   Matt Gagne <matt.gagne@state.vt.us>
  22  */
  23
  24 #include <errno.h>
  25 #include <getopt.h>
  26 #include <iostream>
  27 #include <libdaemon/dlog.h>
  28 #include <libdaemon/dpid.h>
  29 #include <signal.h>
  30 #include <stdio.h>
  31 #include <stdlib.h>
  32 #include <sys/types.h>
  33 #include <sys/stat.h>
  34 #include <fcntl.h>
  35
  36 #include "config.hxx"
  37 #include "clam.hxx"
  38 #include "inoclam.hxx"
  39 #include "inotify.hxx"
  40 #include "monitor.hxx"
  41 #include "signal.hxx"
  42 #include "smtp.hxx"
  43
  44 /**
  45  * Determines if gatewayavd should run in the background (daemonized) or
  46  * not. If daemonize is 1, then gatewayavd should run in the background.
  47  */
  48 int daemonize;
  49
  50 /**
  51  * Determines if our process killed a running inoclam process successfully.
  52  */
  53 int killed;
  54
  55 /**
  56  * Displays some version and copyright information upon request (-v or --version).
  57  */
  58 void display_version()
  59 {
  60         daemon_log(LOG_INFO, "inoclam v%s (%s)", VERSION, CODENAME);
  61         daemon_log(LOG_INFO, "Copyright (C) 2007 Vermont Department of Taxes");
  62         daemon_log(LOG_INFO, "This is free software; see the source for copying conditions.  There is NO");
  63         daemon_log(LOG_INFO, "warranty; not even for MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.");
  64 }
  65
  66 /**
  67  * Displays some usage information, command line parameters and whatnot.
  68  * @param program the name of the program.
  69  */
  70 void display_help(char *program)
  71 {
  72         daemon_log(LOG_INFO, "Usage: %s [options]", program);
  73         daemon_log(LOG_INFO, "Options:");
  74         daemon_log(LOG_INFO, "    -h --help          Show this help message");
  75         daemon_log(LOG_INFO, "    -v --version       Show version information");
  76         daemon_log(LOG_INFO, "    -k --kill          Kill the running instance");
  77         daemon_log(LOG_INFO, "    -f --foreground    Run in the foreground");
  78 }
  79
  80 /**
  81  * A command line parser using getopts.
  82  * @param argc The number of command line arguments coming in argv.
  83  * @param argv The command line arguments.
  84  * @return Returns 0 on success and non-zero when we want the program to terminate.
  85  */
  86 int parse_args(int argc, char **argv)
  87 {
  88         int option_index;
  89         int done;
  90
  91         static struct option long_options[] = {
  92                 {"help", no_argument, 0, 'h'},
  93                 {"version", no_argument, 0, 'v'},
  94                 {"kill", no_argument, 0, 'k'},
  95                 {"foreground", no_argument, 0, 'f'},
  96                 {0, 0, 0, 0}
  97         };
  98
  99         option_index = 0;
 100         done = 0;
 101
 102         while (!done) {
 103                 int c;
 104                 int ret;
 105
 106                 c = getopt_long(argc, argv, "hvkf", long_options, &option_index);
 107                 if (c < 0) {
 108                         break;
 109                 }
 110
 111                 switch (c) {
 112                 case 'h':
 113                         display_help(argv[0]);
 114                         done = 1;
 115                         break;
 116                 case 'v':
 117                         display_version();
 118                         done = 1;
 119                         break;
 120                 case 'k':
 121                         ret = daemon_pid_file_kill_wait(SIGQUIT, 30);
 122                         if (ret < 0) {
 123                                 daemon_log(LOG_ERR, "Daemon not killed: (%s)", strerror(errno));
 124                         } else {
 125                                 killed = 1;
 126                         }
 127                         done = 1;
 128                         break;
 129                 case 'f':
 130                         daemonize = 0;
 131                         break;
 132                 default:
 133                         daemon_log(LOG_ERR, "Unsupported option");
 134                         done = 1;
 135                         break;
 136                 }
 137         }
 138
 139         return done;
 140 }
 141
 142 int main(int argc, char *argv[], char *envp[])
 143 {
 144         int fd;
 145         int ret;
 146         pid_t pid;
 147
 148         /* Default Values for Global Variables */
 149         daemonize = 1;
 150         killed = 0;
 151         exit_now = 0;
 152
 153         /* Sanity Checks */
 154         if (argc < 1 || !argv || !argv[0]) {
 155                 daemon_log(LOG_ERR, "(%u:%s) Cannot determine program name from argv[0]\n");
 156                 return 1;
 157         }
 158
 159         daemon_pid_file_ident = daemon_log_ident = daemon_ident_from_argv0(argv[0]);
 160
 161         if (geteuid() != 0) {
 162                 daemon_log(LOG_ERR, "You need root privileges to run this application.");
 163                 return 1;
 164         }
 165
 166         /* Command Line Arguements */
 167         ret = parse_args(argc, argv);
 168         if (ret) {
 169                 return (killed ? 0 : ret);
 170         }
 171
 172         pid = daemon_pid_file_is_running();
 173         if (pid > 0) {
 174                 daemon_log(LOG_ERR, "%s is already running (PID => %u)", argv[0], daemon_log_ident, pid);
 175                 daemon_log(LOG_INFO, "Use `%s -k` to kill the running instance", daemon_log_ident);
 176                 return 1;
 177         }
 178
 179         /* Daemonize */
 180         if (daemonize) {
 181                 /* Configure Logging */
 182                 daemon_log_use = DAEMON_LOG_SYSLOG;
 183
 184                 umask(0);
 185
 186                 pid = fork();
 187                 if (pid < 0) {
 188                         return 1;
 189                 } else if (pid > 0) {
 190                         return 0;
 191                 }
 192
 193                 setsid();
 194
 195                 pid = fork();
 196                 if (pid < 0) {
 197                         return 1;
 198                 } else if (pid > 0) {
 199                         return 0;
 200                 }
 201
 202                 ret = chdir("/");
 203                 if (ret < 0) {
 204                         daemon_log(LOG_ERR, "Could not chdir() to '/': %s", strerror(errno));
 205                         return 1;
 206                 }
 207
 208                 /* close open file descriptors */
 209                 for (fd = 0; fd < getdtablesize(); fd++) {
 210                         ret = close(fd);
 211                         if (ret == -1 && errno != EBADF) {
 212                                 daemon_log(LOG_ERR, "Could not close fd #%d: %s", fd, strerror(errno));
 213                                 return 1;
 214                         }
 215                 }
 216
 217                 /* re-open stdin, stdout, stderr */
 218                 fd = open("/dev/null", O_RDONLY);
 219                 fd = open("/dev/null", O_WRONLY);
 220                 fd = open("/dev/null", O_WRONLY);
 221         }
 222
 223         ret = daemon_pid_file_create();
 224         if (ret < 0) {
 225                 daemon_log(LOG_ERR, "Could not create PID file: %s", strerror(errno));
 226                 return 1;
 227         }
 228
 229         /* this must run before any threads are created */
 230         monitor_init();
 231
 232         /* Configure */
 233         config *conf;
 234         conf = new config;
 235
 236         conf->parse();
 237
 238         /* Install Signal Handlers */
 239         install_signal_handlers();
 240
 241         /* Initialize Virus Detection Engine and Load Virus Definitions */
 242         clam_init();
 243
 244         /* Begin Monitoring watch_dir for Viruses */
 245         inotify_main(conf);
 246
 247         /* Free resources used by libclamav */
 248         clam_exit();
 249
 250         monitor_wait();         /* thread cleanup */
 251         pthread_mutex_destroy(&engine_lock);
 252         pthread_attr_destroy(&ta);
 253
 254         conf->config_free();
 255         delete conf;
 256         daemon_pid_file_remove();
 257
 258         daemon_log(LOG_INFO, "Exiting...");
 259         return 0;
 260 }