Yo Mismo wrote:
I want to add a wtap encapsulation for a new link layer protocol. I have
added the name and abrev to encap_type_info encap_table_base in wtap.c
and also in wtap.h I have added it (#define WTAP_ENCAP_XXX 127)
The dissector reg handoff calls
dissector_add("wtap_encap", WTAP_ENCAP_XXX , xxx_handle);
But when I open a captured file, the dissector don't works and it shows
WTAP ENCAP = 0 in the info column
When I use for example
dissector_add("wtap_encap", 0 , xxx_handle);
the dissector works fine, so I think it's a problem with the definition
for encapsulation. What I'm doing wrong?
The WTAP_ENCAP numbers are NOT equal to the PCAP DLT numbers. There is
a mapping between the two in pcap-common.c.
Of course (to reiterate what Chris said) you MUST first get a new PCAP
DLT number from tcpdump-workers OR use one of the "USER" ones. It's
very easy to do and will save everyone a lot of headaches.
