Add hardware timestamping support

pcap provides a pcap_set_tstamp_type function, which can be used to request
hardware timestamps from a supporting kernel.

This patch adds support for aforementioned function as well as two new
command line options to dumpcap, wireshark and tshark:

    --list-time-stamp-types
                             List time stamp types supported for the interface
    --time-stamp-type <type>
                             Change the interface's timestamp method

Name choice mimics those used by tcpdump(1), which already supports this
feature. However, unlike tcpdump, we provide both options unconditionally.
If Wireshark was configured without pcap_set_tstamp_type being available,
--list-time-stamp-types reports an empty list.

Change-Id: I418a4b2b84cb01949cd262aad0ad8427f5ac0652
Signed-off-by: Ahmad Fatoum <ahmad.fatoum@siemens.com>
Reviewed-on: https://code.wireshark.org/review/23113
Petri-Dish: Guy Harris <guy@alum.mit.edu>
Tested-by: Petri Dish Buildbot <buildbot-no-reply@wireshark.org>
Reviewed-by: Anders Broman <a.broman58@gmail.com>

1 files changed, 13 insertions, 7 deletions

diff --git a/ui/gtk/main.c b/ui/gtk/main.c
index b9b4292cc4..8214139455 100644
--- a/ui/gtk/main.c
+++ b/ui/gtk/main.c
@@ -1996,6 +1996,7 @@ main(int argc, char *argv[])
 #endif
 #endif
 #endif
+    int                  caps_queries = 0;
     gint                 pl_size = 280, tv_size = 95, bv_size = 75;
     gchar               *rc_file;
     dfilter_t           *rfcode = NULL;
@@ -2294,8 +2295,13 @@ main(int argc, char *argv[])
 
     fill_in_local_interfaces(main_window_update);
 
-    if (global_commandline_info.start_capture || global_commandline_info.list_link_layer_types) {
-        /* We're supposed to do a live capture or get a list of link-layer
+    if  (global_commandline_info.list_link_layer_types)
+        caps_queries |= CAPS_QUERY_LINK_TYPES;
+     if (global_commandline_info.list_timestamp_types)
+        caps_queries |= CAPS_QUERY_TIMESTAMP_TYPES;
+
+    if (global_commandline_info.start_capture || caps_queries) {
+        /* We're supposed to do a live capture or get a list of link-layer/timestamp
            types for a live capture device; if the user didn't specify an
            interface to use, pick a default. */
         ret = capture_opts_default_iface_if_necessary(&global_capture_opts,
@@ -2305,13 +2311,13 @@ main(int argc, char *argv[])
         }
     }
 
-    if (global_commandline_info.list_link_layer_types) {
+    if (caps_queries) {
         /* Get the list of link-layer types for the capture devices. */
         if_capabilities_t *caps;
         guint i;
         interface_t device;
         for (i = 0; i < global_capture_opts.all_ifaces->len; i++) {
-
+            int if_caps_queries = caps_queries;
             device = g_array_index(global_capture_opts.all_ifaces, interface_t, i);
             if (device.selected) {
                 gchar* auth_str = NULL;
@@ -2342,10 +2348,10 @@ main(int argc, char *argv[])
                 create_console();
 #endif /* _WIN32 */
 #if defined(HAVE_PCAP_CREATE)
-                capture_opts_print_if_capabilities(caps, device.name, device.monitor_mode_supported);
-#else
-                capture_opts_print_if_capabilities(caps, device.name, FALSE);
+                if (device.monitor_mode_supported)
+                    if_caps_queries |= CAPS_MONITOR_MODE;
 #endif
+                capture_opts_print_if_capabilities(caps, device.name, if_caps_queries);
 #ifdef _WIN32
                 destroy_console();
 #endif /* _WIN32 */