[FIX]fix stop_dissect_capture_pkg and handle_packet function, ensure …

…that the packet capture is started and stopped correctly

go.mod

@@ -3,3 +3,10 @@ module github.com/randolphcyg/gowireshark
 go 1.21.5
 
 require github.com/pkg/errors v0.9.1
+
+require (
+	github.com/davecgh/go-spew v1.1.1 // indirect
+	github.com/pmezard/go-difflib v1.0.0 // indirect
+	github.com/stretchr/testify v1.8.4 // indirect
+	gopkg.in/yaml.v3 v3.0.1 // indirect
+)

go.sum

@@ -1,2 +1,11 @@
+github.com/davecgh/go-spew v1.1.1 h1:vj9j/u1bqnvCEfJOwUhtlOARqs3+rkHYY13jYWTU97c=
+github.com/davecgh/go-spew v1.1.1/go.mod h1:J7Y8YcW2NihsgmVo/mv3lAwl/skON4iLHjSsI+c5H38=
 github.com/pkg/errors v0.9.1 h1:FEBLx1zS214owpjy7qsBeixbURkuhQAwrK5UwLGTwt4=
 github.com/pkg/errors v0.9.1/go.mod h1:bwawxfHBFNV+L2hUp1rHADufV3IMtnDRdf1r5NINEl0=
+github.com/pmezard/go-difflib v1.0.0 h1:4DBwDE0NGyQoBHbLQYPwSUPoCMWR5BEzIk/f1lZbAQM=
+github.com/pmezard/go-difflib v1.0.0/go.mod h1:iKH77koFhYxTK1pcRnkKkqfTogsbg7gZNVY4sRDYZ/4=
+github.com/stretchr/testify v1.8.4 h1:CcVxjf3Q8PM0mHUKJCdn+eZZtm5yQwehR5yeSVQQcUk=
+github.com/stretchr/testify v1.8.4/go.mod h1:sz/lmYIOXD/1dqDmKjjqLyZ2RngseejIcXlSw2iwfAo=
+gopkg.in/check.v1 v0.0.0-20161208181325-20d25e280405/go.mod h1:Co6ibVJAznAaIkqp8huTwlJQCZ016jof/cbN4VW5Yz0=
+gopkg.in/yaml.v3 v3.0.1 h1:fxVm/GzAzEWqLHuvctI91KS9hhNmmWOoWu0XTYJS7CA=
+gopkg.in/yaml.v3 v3.0.1/go.mod h1:K4uyk7z7BCEPqu6E+C64Yfv1cQ7kz7rIZviUmN+EgEM=

online.c

@@ -613,10 +613,6 @@ char *handle_packet(char *device_name, char *bpf_expr, int num, int promisc,
   before_callback_init(device);
   pcap_loop(device->content.handle, num, process_packet_callback,
             (u_char *)device->device_name);
-  // close libpcap device handler
-  pcap_close(device->content.handle);
-  // close cf file for live capture
-  close_cf_live(device->content.cf_live);
 
   return "";
 }
@@ -633,11 +629,12 @@ char *stop_dissect_capture_pkg(char *device_name) {
     return "The device is not in the global map";
   }
 
-  if (!device->content.handle) {
+  if (!device || !device->content.handle) {
     return "This device has no pcap_handle, no need to close";
   }
 
   pcap_breakloop(device->content.handle);
+  device->content.handle = NULL;
 
   // close cf file for live capture
   close_cf_live(device->content.cf_live);