HTTP/1.1 chunked Transfer-Encoding doesn't have a overall length,
but requires scanning through variable length chunks to find the
end. If we determine that additional segments are needed, and
we have a sequence number (or other identifier) for the message,
store the position of the last chunk size found.
Use this to start scanning at that same offset when the next
segment arrives, reducing the algorithm for determining if
when we have the complete chunked message from O(N^2) to O(N),
which can be significant on captures with many chunks.
This does most of #14382, reducing the length of time to process
a file with 2 pass tshark from over 8.5 secs to under 3 seconds
on my machine. There is still some O(N^2) contribution from the
reassembly code itself with many small fragments (see #17311).
Other dissectors need some small changes to enable this for
HTTP over other transport layers. (TLS would be fairly easy and
is the other important case.)
Any request or response with the Content-Type header and no
Content-Length header would cause the HTTP dissector to combine all
segments until the end of the connection. This is bogus, it should only
do this for HTTP responses under stricter conditions.
To fix this issue: 1) explicitly disable body desegmentation for
messages that never have a message body, 2) restrict "desegmentat until
the end" to HTTP responses.
The "Connection: Keep-Alive" case was a fix for bug 1142, but that is
now properly addressed by checking for the 304 status code.
Bug: 13116
Change-Id: I02371ac88ec2de6ee966fdc6df0dd246ad49c46d
Reviewed-on: https://code.wireshark.org/review/33035
Petri-Dish: Peter Wu <peter@lekensteyn.nl>
Tested-by: Petri Dish Buildbot
Reviewed-by: Alexis La Goutte <alexis.lagoutte@gmail.com>
Reviewed-by: Peter Wu <peter@lekensteyn.nl>
(Using sed : sed -i '/^ \* \$Id\$/,+1 d')
Fix manually some typo (in export_object_dicom.c and crc16-plain.c)
Change-Id: I4c1ae68d1c4afeace8cb195b53c715cf9e1227a8
Reviewed-on: https://code.wireshark.org/review/497
Reviewed-by: Anders Broman <a.broman58@gmail.com>
Adds const declarations to req_resp_hdrs_do_reassembly() and re-orders some actions to occur after tests which may decide that the actions were not required.
svn path=/trunk/; revision=23504
John Thacker