From a9028b370588486a3a1aa30ad3324417dc1eb461 Mon Sep 17 00:00:00 2001
From: Will Thompson <will@willthompson.co.uk>
Date: Tue, 26 May 2020 07:35:57 +0100
Subject: reader: Check link type

---
 c-sources/pcap-reader.c | 11 +++++++++++
 1 file changed, 11 insertions(+)

diff --git a/c-sources/pcap-reader.c b/c-sources/pcap-reader.c
index 8d03245..cc12f24 100644
--- a/c-sources/pcap-reader.c
+++ b/c-sources/pcap-reader.c
@@ -250,6 +250,17 @@ initable_init (
 
   /* Now owned by pcap_in */
   self->filep = NULL;
+
+  int dlt = pcap_datalink (self->pcap_in);
+  if (dlt != DLT_DBUS)
+    {
+      g_set_error (error, G_IO_ERROR, G_IO_ERROR_NOT_SUPPORTED,
+                   "Unexpected link type %s",
+                   pcap_datalink_val_to_name (dlt));
+      bustle_pcap_reader_close (self);
+      return FALSE;
+    }
+
   return TRUE;
 }
 
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