13df9b0b64
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.)
41 lines
1.6 KiB
C
41 lines
1.6 KiB
C
/** @file
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* Declarations of routines handling protocols with a request/response line,
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* headers, a blank line, and an optional body.
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*
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* Wireshark - Network traffic analyzer
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* By Gerald Combs <gerald@wireshark.org>
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* Copyright 1998 Gerald Combs
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*
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* SPDX-License-Identifier: GPL-2.0-or-later
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*/
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#ifndef __REQ_RESP_HDRS_H__
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#define __REQ_RESP_HDRS_H__
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#include "ws_symbol_export.h"
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/**
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* Optionally do reassembly of the request/response line, headers, and body.
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*
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* @param tvb The buffer.
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* @param offset The offset in the buffer to begin inspection.
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* @param pinfo Packet info from the parent protocol.
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* @param desegment_headers Do desegmentation on headers.
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* @param desegment_body Do desegmentation on body.
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* @param desegment_until_fin When desegment_body is enabled and no
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* Content-Length header is found, assume that all data following the headers
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* are part of the body.
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* @param[in,out] last_chunk_offset For the chunked Transfer-Encoding,
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* the offset (relative to the initial tvb offset) of the last chunk size
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* found. The result can be fed back into a future call in order to skip
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* to a later chunk and reduce processing from O(N^2) to O(N). Use 0 for
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* the initial call. Only set when chunked TE is found. May be NULL.
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* @return TRUE if desegmentation is complete otherwise FALSE
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*/
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WS_DLL_PUBLIC gboolean
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req_resp_hdrs_do_reassembly(tvbuff_t *tvb, const int offset, packet_info *pinfo,
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const gboolean desegment_headers, const gboolean desegment_body,
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gboolean desegment_until_fin, int *last_chunk_offset);
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#endif
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