forked from osmocom/wireshark
166 lines
4.3 KiB
C
166 lines
4.3 KiB
C
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/* packet-git.c
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* Routines for git packet dissection
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* RFC 1939
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* Copyright 2010, Jelmer Vernooij <jelmer@samba.org>
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*
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* $Id$
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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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* Copied from packet-pop.c
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* as published by the Free Software Foundation; either version 2
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* of the License, or (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
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*/
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#ifdef HAVE_CONFIG_H
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# include "config.h"
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#endif
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#include <stdio.h>
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#include <stdlib.h>
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#include <glib.h>
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#include <epan/packet.h>
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#include <epan/strutil.h>
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#include <epan/prefs.h>
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#include "packet-tcp.h"
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static int proto_git = -1;
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static gint ett_git = -1;
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static gint hf_git_packet_len = -1;
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static gint hf_git_packet_data = -1;
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static gint hf_git_packet_terminator = -1;
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#define TCP_PORT_GIT 9418
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/* desegmentation of Git over TCP */
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static gboolean git_desegment = TRUE;
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static gboolean tvb_get_packet_length(tvbuff_t *tvb, int offset,
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guint16 *length)
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{
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guint8 *lenstr;
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lenstr = tvb_get_ephemeral_string(tvb, offset, 4);
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return (sscanf(lenstr, "%hx", length) == 1);
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}
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static guint
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get_git_pdu_len(packet_info *pinfo _U_, tvbuff_t *tvb, int offset)
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{
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guint16 plen;
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if (!tvb_get_packet_length(tvb, offset, &plen))
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return 0; /* No idea what this is */
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if (plen == 0) {
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/* Terminator packet */
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return 4;
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} else {
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return plen;
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}
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}
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static void
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dissect_git_pdu(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree)
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{
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proto_tree *git_tree;
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proto_item *ti, *ti1, *ti2;
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int offset = 0;
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guint16 plen;
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col_set_str(pinfo->cinfo, COL_PROTOCOL, "GIT");
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col_set_str(pinfo->cinfo, COL_INFO, "Git Smart Protocol");
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ti = proto_tree_add_item(tree, proto_git, tvb, offset, -1, FALSE);
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git_tree = proto_item_add_subtree(ti, ett_git);
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if (!tvb_get_packet_length(tvb, 0, &plen))
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return;
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if (plen == 0) {
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ti1 = proto_tree_add_uint(git_tree, hf_git_packet_terminator, tvb, offset,
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4, plen);
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return;
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}
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if (git_tree)
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{
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tvbuff_t *subtvb;
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ti1 = proto_tree_add_uint(git_tree, hf_git_packet_len, tvb, offset,
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4, plen);
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subtvb = tvb_new_subset(tvb, offset+4, plen-4, plen-4);
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ti2 = proto_tree_add_item(git_tree, hf_git_packet_data, tvb, offset+4,
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plen-4, FALSE);
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}
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}
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static void
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dissect_git(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree)
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{
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tcp_dissect_pdus(tvb, pinfo, tree, git_desegment, 4, get_git_pdu_len,
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dissect_git_pdu);
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}
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void
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proto_register_git(void)
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{
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static hf_register_info hf[] = {
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{ &hf_git_packet_len,
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{ "Packet length", "git.length", FT_UINT16, BASE_HEX, NULL, 0x0, NULL, HFILL },
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},
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{ &hf_git_packet_data,
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{ "Packet data", "git.data", FT_BYTES, BASE_NONE, NULL, 0x0, NULL, HFILL },
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},
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{ &hf_git_packet_terminator,
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{ "Terminator packet", "git.terminator", FT_UINT16, BASE_HEX, NULL, 0x0, NULL, HFILL },
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},
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};
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static gint *ett[] = {
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&ett_git,
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};
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module_t *git_module;
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proto_git = proto_register_protocol("Git Smart Protocol", "GIT", "git");
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register_dissector("git", dissect_git, proto_git);
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proto_register_field_array(proto_git, hf, array_length(hf));
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proto_register_subtree_array(ett, array_length(ett));
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git_module = prefs_register_protocol(proto_git, NULL);
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prefs_register_bool_preference(git_module, "desegment",
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"Reassemble GIT messages spanning multiple TCP segments",
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"Whether the GIT dissector should reassemble messages spanning multiple TCP segments."
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" To use this option, you must also enable \"Allow subdissectors to reassemble TCP streams\" in the TCP protocol settings.",
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&git_desegment);
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}
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void
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proto_reg_handoff_git(void)
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{
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dissector_handle_t git_handle;
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git_handle = find_dissector("git");
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dissector_add("tcp.port", TCP_PORT_GIT, git_handle);
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}
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