Add check for pcap timestamp warnings. (GH #693)

Previously would silently accept any of "host", "adapter", or
"adapter_unsynced" regardless of whether the interface supported
the option.

1 files changed, 4 insertions, 0 deletions

diff --git a/tcpdump.c b/tcpdump.c
index 07965fa3..e402c428 100644
--- a/tcpdump.c
+++ b/tcpdump.c
@@ -1305,6 +1305,10 @@ open_interface(const char *device, netdissect_options *ndo, char *ebuf)
 		if (status < 0)
 			error("%s: Can't set time stamp type: %s",
 		              device, pcap_statustostr(status));
+		else if (status > 0)
+			warning("When trying to set timestamp type '%s' on %s: %s",
+				pcap_tstamp_type_val_to_name(jflag), device,
+				pcap_statustostr(status));
 	}
 #endif
 	status = pcap_activate(pc);