Dumpcap: Fix writing SHBs and IDBs.

If we have a single capture source and that capture source is pcapng and
we're writing a pcapng file, do the following:

- Pass its SHB and IDBs through unmodified. Don't save or write command
  line interface IDBs.

- Save the most recent SHB and IDBs so that we can write them when we're
  writing multiple output files.

If we have multiple capture sources, do the following:

- Write Dumpcap's SHB.

- Keep a global list of IDBs, consisting of both command line interfaces
  and IDBs read from pcapng sources.

- When reading an EPB or ISB, remap its local interface number to its
  corresponding global number.

Add Dumpcap pcapng section tests. Make the application IDs in the
"many_interfaces" captures unique.

Change-Id: I2005934c1f83d839727421960005f106d6c682dd
Reviewed-on: https://code.wireshark.org/review/30085
Petri-Dish: Gerald Combs <gerald@wireshark.org>
Tested-by: Petri Dish Buildbot
Reviewed-by: Gerald Combs <gerald@wireshark.org>

3 files changed, 0 insertions, 0 deletions

diff --git a/test/captures/many_interfaces.pcapng.1 b/test/captures/many_interfaces.pcapng.1
index 6fa742f47d..960e35d913 100644
--- a/test/captures/many_interfaces.pcapng.1
+++ b/test/captures/many_interfaces.pcapng.1
diff --git a/test/captures/many_interfaces.pcapng.2 b/test/captures/many_interfaces.pcapng.2
index 653a1edc6b..7056f46c34 100644
--- a/test/captures/many_interfaces.pcapng.2
+++ b/test/captures/many_interfaces.pcapng.2
diff --git a/test/captures/many_interfaces.pcapng.3 b/test/captures/many_interfaces.pcapng.3
index bd848d2e9e..48367c0a54 100644
--- a/test/captures/many_interfaces.pcapng.3
+++ b/test/captures/many_interfaces.pcapng.3