[Listener] Daemon mode (-D)

Basic implementation of the daemon mode.

owlps-listener/owlps-listener.h

@@ -62,7 +62,7 @@
 
 
 /* Arguments & program configuration */
-#define OPTIONS "a:Af:hH:i:I:Kl:m:n:p:P:qr:t:vVw:" // getopt string
+#define OPTIONS "a:ADf:hH:i:I:Kl:m:n:p:P:qr:t:vVw:" // getopt string
 #define DEFAULT_CONFIG_FILE "/usr/local/etc/owlps/owlps-listener.conf"
 enum {MODE_ACTIVE = 'a', MODE_PASSIVE = 'p', MODE_MIXED = 'm'} ;
 #define DEFAULT_AUTOCALIBRATION_HELLO_DELAY 120 // seconds
@@ -213,6 +213,10 @@ void print_version(void) ;
   (cfg_setint(cfg, "mode", (MODE)))
 #define GET_MODE() \
   (cfg_getint(cfg, "mode"))
+#define SET_DAEMON() \
+  (cfg_setbool(cfg, "daemon", cfg_true))
+#define GET_DAEMON() \
+  (cfg_getbool(cfg, "daemon"))
 #define SET_AGGREGATION_IP(IP) \
   (cfg_setstr(cfg, "aggregation_ip", (IP)))
 #define GET_AGGREGATION_IP() \
@@ -296,6 +300,10 @@ void print_version(void) ;
 
 /* Home-made structure macros */
 #else // USE_CONFIG_FILE
+#define SET_DAEMON() \
+  (options.daemon = owl_true)
+#define GET_DAEMON() \
+  (options.daemon)
 #define SET_MODE(MODE) \
   (options.mode = (MODE))
 #define GET_MODE() \

owlps-listener/owlps-listenerd.c

@@ -60,6 +60,7 @@ cfg_t *cfg = NULL ; // Configuration structure
  * options.
  */
 struct {
+  owl_bool daemon ;
   char mode ;
   char aggregation_ip[INET_ADDRSTRLEN] ;
   uint_fast16_t aggregation_port ;
@@ -84,6 +85,7 @@ struct {
 #endif // USE_PTHREAD
   uint_fast8_t verbose ;
 } options = { // Initalise default options:
+  owl_false,
   MODE_ACTIVE,
   "127.0.0.1",
   OWL_DEFAULT_LISTENER_PORT,
@@ -183,6 +185,14 @@ int main(int argc, char *argv[])
     }
 #endif // USE_PTHREAD
 
+  if (GET_DAEMON())
+    {
+      if (VERBOSE_WARNING)
+        fprintf(stderr, "Detaching to background...\n") ;
+      if (daemon(0, 0))
+        perror("Cannot daemonize") ;
+    }
+
   ret = capture() ; // Capture loop
 
   /* Wait for the threads to terminate */
@@ -290,6 +300,8 @@ int parse_config_file(int argc, char **argv)
   // If we use libconfuse, we declare options:
   cfg_opt_t opts[] =
     {
+      // Daemon mode:
+      CFG_BOOL("daemon", cfg_false, CFGF_NONE),
       // Listening mode: a for active, p for passive, m for mixed
       // (default: a):
       CFG_INT("mode", MODE_ACTIVE, CFGF_NONE),
@@ -456,6 +468,9 @@ int parse_main_options(int argc, char **argv)
           SET_AUTOCALIBRATION_PORT(strtol(optarg, NULL, 0)) ;
 #endif // USE_PTHREAD
           break ;
+        case 'D' :
+          SET_DAEMON() ;
+          break ;
         case 'f' : // Config file
           break ; // (already parsed)
         case 'H' :
@@ -1451,6 +1466,7 @@ void print_usage()
   printf("Usage :\n"
          "\t%s"
          " [-f config_file]"
+         " [-D]"
          " [-m mode]"
          " [-i aggregation_ip]"
          " [-l listening_port]"
@@ -1476,6 +1492,12 @@ void print_usage()
          "\t-f config_file\tUse 'config_file' instead of the default"
          " configuration file (%s). Available only if program was"
          " compiled with libconfuse.\n"
+         "\t-D\t\tDaemon mode.\n"
+         "\t-v\t\tBe verbose. You can use this option up to 3 times to"
+         " increase the level of verbosity (1 = warnings, 2 = useful"
+         " information, 3 = a lot of information, 4 = display each"
+         " captured packet).\n"
+         "\t-q\t\tQuiet mode (default): sets the verbose level to 0.\n"
 
          "Capture options:\n"
          "\t-m mode\t\t\tCapture mode: a(ctive), p(assive), m(ixed)"
@@ -1510,16 +1532,11 @@ void print_usage()
          "\tdirection x y z\t\tThe coordinates of the listener"
          " (direction is an integer; x, y, z are floats).\n"
 
-         "Other options:\n"
+         "Miscelanneous options:\n"
          "\t-K\tKeep the monitor mode up on wifi_iface. Use it with buggy"
          " drivers that disable monitor mode periodically. Available"
          " only if the program was compiled with the option"
          " ENABLE_KEEP_MONITOR.\n"
-         "\t-v\tBe verbose. You can use this option up to 3 times to"
-         " increase the level of verbosity (1 = warnings, 2 = useful"
-         " information, 3 = a lot of information, 4 = display each"
-         " captured packet).\n"
-         "\t-q\tQuiet mode (default): sets the verbose level to 0.\n"
          ,
          program_name,
          program_name,