src/inotify.cxx

   1 /*
   2  * inoclam - Inotify+ClamAV virus scanner
   3  * Copyright (C) 2007, 2008, 2009 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 version 2 as
   7  * published by the Free Software Foundation.
   8  *
   9  * This program is distributed in the hope that it will be useful,
  10  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  11  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  12  * GNU General Public License for more details.
  13  *
  14  * You should have received a copy of the GNU General Public License
  15  * along with this program; if not, write to the Free Software
  16  * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
  17  */
  18
  19 #include <errno.h>
  20 #include <idn-int.h>
  21 #include <inotifytools/inotifytools.h>
  22 #include <inotifytools/inotify.h>
  23 #include <libdaemon/dlog.h>
  24 #include <stdlib.h>
  25 #include <string.h>
  26 #include <unistd.h>
  27
  28 #include <string>
  29
  30 #include "config.hxx"
  31 #include "clam.hxx"
  32 #include "inotify.hxx"
  33 #include "monitor.hxx"
  34 #include "signal.hxx"
  35 #include "smtp.hxx"
  36
  37 /**
  38  * Watch the specified directory for changes and call contains_virus()
  39  * @param conf configuration
  40  */
  41 void *inotify_main(void *v)
  42 {
  43         inotify_main_args_t *args;
  44         struct inotify_event *event;
  45         int length;
  46
  47         args = (inotify_main_args_t *) v;
  48
  49         event = NULL;
  50         length = 0;
  51
  52         if (args == NULL || args->conf == NULL || args->clamav == NULL || args->conf->getDirectory() == NULL) {
  53                 daemon_log(LOG_ERR, "Invalid Arguments!");
  54                 exit_now = 1;
  55                 if (args) {
  56                         free(args);
  57                         args = NULL;
  58                 }
  59                 monitor_dec();
  60                 return NULL;
  61         }
  62
  63         if (!inotifytools_initialize() || !inotifytools_watch_recursively(args->conf->getDirectory(), IN_ALL_EVENTS)) {
  64                 if (inotifytools_error() == ENOENT) {
  65                         daemon_log(LOG_ERR, "directory '%s' does not exist. Check /etc/inoclam.conf", args->conf->getDirectory());
  66                 } else {
  67                         daemon_log(LOG_ERR, "Failed init inotify: %s", strerror(inotifytools_error()));
  68                 }
  69                 exit_now = 1;
  70         }
  71
  72         daemon_log(LOG_INFO, "inotify watching '%s'", args->conf->getDirectory());
  73
  74         while (!exit_now) {
  75                 event = inotifytools_next_event(3);
  76                 if (event && event->name && event->wd) {
  77                         if ((event->mask & (IN_CLOSE_WRITE | IN_MOVED_TO)) && !(event->mask & IN_ISDIR)) {
  78                                 /*
  79                                  * Scan writtable files that are being closed.
  80                                  * Scan files that have been moved to a watched directory.
  81                                  * TODO: run the scan in a new thread.
  82                                  */
  83
  84                                 std::string * filename;
  85                                 filename = new std::string();
  86                                 filename->append(inotifytools_filename_from_wd(event->wd), strlen(inotifytools_filename_from_wd(event->wd)));
  87                                 filename->append(event->name, strlen(event->name));
  88
  89                                 /* Perform the Virus Checking */
  90                                 args->clamav->clam_scan(filename, args->conf);
  91
  92                                 if (args->conf->getFileEMailEnabled() == cfg_true) {
  93                                         std::string * msg;
  94                                         msg = new std::string();
  95
  96                                         msg->append("File: ");
  97                                         msg->append(filename->c_str());
  98                                         msg->append("\n");
  99
 100                                         msg->append("Date: ");
 101                                         std::string * tstamp;
 102                                         tstamp = smtp_get_timestamp();
 103                                         if (!tstamp) {
 104                                                 exit_now = 1;
 105                                                 break;
 106                                         }
 107                                         msg->append(tstamp->c_str());
 108                                         delete tstamp;
 109
 110                                         msg->append("\n\n");
 111                                         std::string * banner;
 112                                         banner = smtp_get_banner();
 113                                         msg->append(banner->c_str());
 114                                         delete banner;
 115
 116                                         smtp_send(args->conf->getFileEMailSubject(), msg, args->conf);
 117                                         delete msg;     /* Clean up email msg */
 118                                 }
 119
 120                                 delete filename;        /* Clean up filename */
 121                         } else if ((event->mask & (IN_CREATE | IN_MOVED_TO | IN_DELETE)) && (event->mask & IN_ISDIR)) {
 122                                 /*
 123                                  * If the directory structure has changed, reload the watch list.
 124                                  * Benchmark this to determine if this is too much of a performance hit.
 125                                  */
 126                                 inotifytools_cleanup();
 127
 128                                 if (!inotifytools_initialize() || !inotifytools_watch_recursively(args->conf->getDirectory(), IN_ALL_EVENTS)) {
 129                                         if (inotifytools_error() == ENOENT) {
 130                                                 daemon_log(LOG_ERR, "directory '%s' does not exist. Check /etc/inoclam.conf", args->conf->getDirectory());
 131                                         } else {
 132                                                 daemon_log(LOG_ERR, "Failed init inotify: %s", strerror(inotifytools_error()));
 133                                         }
 134                                         exit_now = 1;
 135                                 }
 136                         }
 137
 138                 }
 139         }
 140
 141         inotifytools_cleanup();
 142         if (args) {
 143                 free(args);
 144                 args = NULL;
 145         }
 146
 147         monitor_dec();
 148         return NULL;
 149 }