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  */
  22
  23 #include <errno.h>
  24 #include <getopt.h>
  25 #include <iostream>
  26 #include <libdaemon/dlog.h>
  27 #include <libdaemon/dpid.h>
  28 #include <signal.h>
  29 #include <stdio.h>
  30 #include <stdlib.h>
  31 #include <sys/types.h>
  32 #include <sys/stat.h>
  33 #include <fcntl.h>
  34
  35 #include "config.hxx"
  36 #include "clam.hxx"
  37 #include "inotify.hxx"
  38 #include "monitor.hxx"
  39 #include "signal.hxx"
  40 #include "smtp.hxx"
  41
  42 #define VERSION "1.0.0"
  43
  44 #define CODENAME "Bender"
  45
  46 /**
  47  * Determines if our process killed a running inoclam process successfully.
  48  */
  49 int killed;
  50
  51 /**
  52  * Displays some version and copyright information upon request (-v or --version).
  53  */
  54 void display_version()
  55 {
  56         daemon_log(LOG_INFO, "inoclam v%s (%s)", VERSION, CODENAME);
  57         daemon_log(LOG_INFO, "Copyright (C) 2007 Vermont Department of Taxes");
  58         daemon_log(LOG_INFO, "This is free software; see the source for copying conditions.  There is NO");
  59         daemon_log(LOG_INFO, "warranty; not even for MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.");
  60 }
  61
  62 /**
  63  * Displays some usage information, command line parameters and whatnot.
  64  * @param program the name of the program.
  65  */
  66 void display_help(char *program)
  67 {
  68         daemon_log(LOG_INFO, "Usage: %s [options]", program);
  69         daemon_log(LOG_INFO, "Options:");
  70         daemon_log(LOG_INFO, "    -h --help       Show this help message");
  71         daemon_log(LOG_INFO, "    -v --version    Show version information");
  72         daemon_log(LOG_INFO, "    -k --kill       Kill the running instance");
  73 }
  74
  75 /**
  76  * A command line parser using getopts.
  77  * @param argc The number of command line arguments coming in argv.
  78  * @param argv The command line arguments.
  79  * @return Returns 0 on success and non-zero when we want the program to terminate.
  80  */
  81 int parse_args(int argc, char **argv)
  82 {
  83         int option_index;
  84         int done;
  85
  86         static struct option long_options[] = {
  87                 {"help", no_argument, 0, 'h'},
  88                 {"version", no_argument, 0, 'v'},
  89                 {"kill", no_argument, 0, 'k'},
  90                 {0, 0, 0, 0}
  91         };
  92
  93         option_index = 0;
  94         done = 0;
  95
  96         while (!done) {
  97                 int c;
  98                 int ret;
  99
 100                 c = getopt_long(argc, argv, "hvk", long_options, &option_index);
 101                 if (c < 0) {
 102                         break;
 103                 }
 104
 105                 switch (c) {
 106                 case 'h':
 107                         display_help(argv[0]);
 108                         done = 1;
 109                         break;
 110                 case 'v':
 111                         display_version();
 112                         done = 1;
 113                         break;
 114                 case 'k':
 115                         ret = daemon_pid_file_kill_wait(SIGQUIT, 30);
 116                         if (ret < 0) {
 117                                 daemon_log(LOG_ERR, "Daemon not killed: (%s)", strerror(errno));
 118                         } else {
 119                                 killed = 1;
 120                         }
 121                         done = 1;
 122                         break;
 123                 default:
 124                         daemon_log(LOG_ERR, "Unsupported option");
 125                         done = 1;
 126                         break;
 127                 }
 128         }
 129
 130         return done;
 131 }
 132
 133 int main(int argc, char *argv[], char *envp[])
 134 {
 135         int fd;
 136         int ret;
 137         pid_t pid;
 138
 139         /* Default Values for Global Variables */
 140         killed = 0;
 141
 142         exit_now = 0;
 143
 144         watch_dir = NULL;
 145
 146         virus_removal_enabled = cfg_true;
 147
 148         smtp_enabled = cfg_true;
 149         smtp_host = NULL;
 150         smtp_port = 0;
 151         smtp_to = NULL;
 152         smtp_from = NULL;
 153         smtp_subject = NULL;
 154
 155         /* Sanity Checks */
 156         if (argc < 1 || !argv || !argv[0]) {
 157                 daemon_log(LOG_ERR, "(%u:%s) Cannot determine program name from argv[0]\n");
 158                 return 1;
 159         }
 160
 161         daemon_pid_file_ident = daemon_log_ident = daemon_ident_from_argv0(argv[0]);
 162
 163         if (geteuid() != 0) {
 164                 daemon_log(LOG_ERR, "You need root privileges to run this application.");
 165                 return 1;
 166         }
 167
 168         /* Command Line Arguements */
 169         ret = parse_args(argc, argv);
 170         if (ret) {
 171                 return (killed ? 0 : ret);
 172         }
 173
 174         pid = daemon_pid_file_is_running();
 175         if (pid > 0) {
 176                 daemon_log(LOG_ERR, "%s is already running (PID => %u)", argv[0], daemon_log_ident, pid);
 177                 daemon_log(LOG_INFO, "Use `%s -k` to kill the running instance", daemon_log_ident);
 178                 return 1;
 179         }
 180
 181         /* Configure Logging */
 182         daemon_log_use = DAEMON_LOG_SYSLOG;
 183
 184         /* Daemonize */
 185         umask(0);
 186
 187         pid = fork();
 188         if (pid < 0) {
 189                 return 1;
 190         } else if (pid > 0) {
 191                 return 0;
 192         }
 193
 194         setsid();
 195
 196         pid = fork();
 197         if (pid < 0) {
 198                 return 1;
 199         } else if (pid > 0) {
 200                 return 0;
 201         }
 202
 203         ret = chdir("/");
 204         if (ret < 0) {
 205                 daemon_log(LOG_ERR, "Could not chdir() to '/': %s", strerror(errno));
 206                 return 1;
 207         }
 208
 209         /* close open file descriptors */
 210         for (fd = 0; fd < getdtablesize(); fd++) {
 211                 ret = close(fd);
 212                 if (ret == -1 && errno != EBADF) {
 213                         daemon_log(LOG_ERR, "Could not close fd #%d: %s", fd, strerror(errno));
 214                         return 1;
 215                 }
 216         }
 217
 218         /* re-open stdin, stdout, stderr */
 219         fd = open("/dev/null", O_RDONLY);
 220         fd = open("/dev/null", O_WRONLY);
 221         fd = open("/dev/null", O_WRONLY);
 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_parse();
 234
 235         /* Install Signal Handlers */
 236         install_signal_handlers();
 237
 238         /* Initialize Virus Detection Engine and Load Virus Definitions */
 239         clam_init();
 240
 241         /* Begin Monitoring watch_dir for Viruses */
 242         inotify_main(watch_dir);
 243
 244         /* Free resources used by libclamav */
 245         clam_exit();
 246
 247         monitor_wait();         /* thread cleanup */
 248         pthread_mutex_destroy(&engine_lock);
 249         pthread_attr_destroy(&ta);
 250
 251         config_free();
 252         daemon_pid_file_remove();
 253
 254         daemon_log(LOG_INFO, "Exiting...");
 255         return 0;
 256 }