c223ebe718
svn path=/trunk/; revision=35995
435 lines
11 KiB
C
435 lines
11 KiB
C
/* packet-distcc.c
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* Routines for distcc dissection
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* Copyright 2003, Brad Hards <bradh@frogmouth.net>
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* Copyright 2003, Ronnie Sahlberg, added TCP desegmentation.
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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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* 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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/* This dissector supports version 1 of the DISTCC protocol */
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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 <string.h>
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#include <time.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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static int proto_distcc = -1;
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static int hf_distcc_version = -1;
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static int hf_distcc_argc = -1;
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static int hf_distcc_argv = -1;
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static int hf_distcc_doti_source = -1;
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static int hf_distcc_stat = -1;
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static int hf_distcc_serr = -1;
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static int hf_distcc_sout = -1;
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static int hf_distcc_doto_object = -1;
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static gint ett_distcc = -1;
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static dissector_handle_t data_handle;
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static gboolean distcc_desegment = TRUE;
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#define TCP_PORT_DISTCC 3632
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static guint glb_distcc_tcp_port = TCP_PORT_DISTCC;
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extern void proto_reg_handoff_distcc(void);
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#define CHECK_PDU_LEN(x) \
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if(parameter>tvb_length_remaining(tvb, offset) || parameter < 1){\
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len=tvb_length_remaining(tvb, offset);\
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col_append_str(pinfo->cinfo, COL_INFO, "[Short" x " PDU]");\
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} \
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tvb_ensure_bytes_exist(tvb, offset, len);
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#define DESEGMENT_TCP(x) \
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if(distcc_desegment && pinfo->can_desegment){\
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/* only attempt reassembly if whe have the full segment */\
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if(tvb_length_remaining(tvb, offset)==tvb_reported_length_remaining(tvb, offset)){\
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if(parameter>tvb_length_remaining(tvb, offset)){\
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proto_tree_add_text(tree, tvb, offset-12, -1, "[Short " x " PDU]");\
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pinfo->desegment_offset=offset-12;\
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pinfo->desegment_len=parameter-tvb_length_remaining(tvb, offset);\
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return offset+len;\
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}\
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}\
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}
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static int
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dissect_distcc_dist(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree, int offset, guint32 parameter)
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{
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proto_tree_add_uint_format(tree, hf_distcc_version, tvb, offset-12, 12, parameter, "DIST: %d", parameter);
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if (check_col(pinfo->cinfo, COL_INFO)) {
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col_append_fstr(pinfo->cinfo, COL_INFO, "DIST:%d ", parameter);
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}
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return offset;
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}
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static int
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dissect_distcc_done(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree, int offset, guint32 parameter)
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{
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proto_tree_add_uint_format(tree, hf_distcc_version, tvb, offset-12, 12, parameter, "DONE: %d", parameter);
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if (check_col(pinfo->cinfo, COL_INFO)) {
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col_append_fstr(pinfo->cinfo, COL_INFO, "DONE:%d ", parameter);
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}
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return offset;
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}
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static int
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dissect_distcc_stat(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree, int offset, guint32 parameter)
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{
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proto_tree_add_uint_format(tree, hf_distcc_stat, tvb, offset-12, 12, parameter, "STAT: %d", parameter);
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if (check_col(pinfo->cinfo, COL_INFO)) {
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col_append_fstr(pinfo->cinfo, COL_INFO, "STAT:%d ", parameter);
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}
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return offset;
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}
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static int
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dissect_distcc_argc(tvbuff_t *tvb, packet_info *pinfo _U_, proto_tree *tree, int offset, guint32 parameter)
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{
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proto_tree_add_uint_format(tree, hf_distcc_argc, tvb, offset-12, 12, parameter, "ARGC: %d", parameter);
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if (check_col(pinfo->cinfo, COL_INFO)) {
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col_append_fstr(pinfo->cinfo, COL_INFO, "ARGC:%d ", parameter);
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}
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return offset;
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}
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static int
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dissect_distcc_argv(tvbuff_t *tvb, packet_info *pinfo _U_, proto_tree *tree, int offset, gint parameter)
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{
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char argv[256];
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int argv_len;
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gint len=parameter;
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CHECK_PDU_LEN("ARGV");
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/* see if we need to desegment the PDU */
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DESEGMENT_TCP("ARGV");
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argv_len=len>255?255:len;
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tvb_memcpy(tvb, argv, offset, argv_len);
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argv[argv_len]=0;
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proto_tree_add_item(tree, hf_distcc_argv, tvb, offset, len, FALSE);
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if (check_col(pinfo->cinfo, COL_INFO)) {
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col_append_fstr(pinfo->cinfo, COL_INFO, "%s ", argv);
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}
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if(len!=parameter){
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proto_tree_add_text(tree, tvb, 0, 0, "[Short ARGV PDU]");
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}
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return offset+len;
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}
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static int
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dissect_distcc_serr(tvbuff_t *tvb, packet_info *pinfo _U_, proto_tree *tree, int offset, gint parameter)
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{
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char argv[256];
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int argv_len;
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gint len=parameter;
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CHECK_PDU_LEN("SERR");
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/* see if we need to desegment the PDU */
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DESEGMENT_TCP("SERR");
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argv_len=len>255?255:len;
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tvb_memcpy(tvb, argv, offset, argv_len);
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argv[argv_len]=0;
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proto_tree_add_item(tree, hf_distcc_serr, tvb, offset, len, FALSE);
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if (check_col(pinfo->cinfo, COL_INFO)) {
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col_append_fstr(pinfo->cinfo, COL_INFO, "SERR:%s ", argv);
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}
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if(len!=parameter){
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proto_tree_add_text(tree, tvb, 0, 0, "[Short SERR PDU]");
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}
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return offset+len;
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}
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static int
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dissect_distcc_sout(tvbuff_t *tvb, packet_info *pinfo _U_, proto_tree *tree, int offset, gint parameter)
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{
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char argv[256];
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int argv_len;
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gint len=parameter;
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CHECK_PDU_LEN("SOUT");
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/* see if we need to desegment the PDU */
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DESEGMENT_TCP("SOUT");
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argv_len=len>255?255:len;
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tvb_memcpy(tvb, argv, offset, argv_len);
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argv[argv_len]=0;
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proto_tree_add_item(tree, hf_distcc_sout, tvb, offset, len, FALSE);
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if (check_col(pinfo->cinfo, COL_INFO)) {
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col_append_fstr(pinfo->cinfo, COL_INFO, "SOUT:%s ", argv);
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}
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if(len!=parameter){
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proto_tree_add_text(tree, tvb, 0, 0, "[Short SOUT PDU]");
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}
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return offset+len;
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}
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static int
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dissect_distcc_doti(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree, int offset, gint parameter)
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{
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gint len=parameter;
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CHECK_PDU_LEN("DOTI");
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/* see if we need to desegment the PDU */
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DESEGMENT_TCP("DOTI");
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col_append_str(pinfo->cinfo, COL_INFO, "DOTI source ");
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proto_tree_add_item(tree, hf_distcc_doti_source, tvb, offset, len, FALSE);
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if(len!=parameter){
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proto_tree_add_text(tree, tvb, 0, 0, "[Short DOTI PDU]");
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}
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return offset+len;
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}
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static int
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dissect_distcc_doto(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree, int offset, gint parameter)
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{
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gint len=parameter;
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CHECK_PDU_LEN("DOTO");
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/* see if we need to desegment the PDU */
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DESEGMENT_TCP("DOTO");
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col_append_str(pinfo->cinfo, COL_INFO, "DOTO object ");
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proto_tree_add_item(tree, hf_distcc_doto_object, tvb, offset, len, FALSE);
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if(len!=parameter){
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proto_tree_add_text(tree, tvb, 0, 0, "[Short DOTO PDU]");
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}
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return offset+len;
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}
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/* Packet dissection routine called by tcp (& udp) when port 3632 detected */
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static void
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dissect_distcc(tvbuff_t *tvb, packet_info *pinfo, proto_tree *parent_tree)
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{
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int offset=0;
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proto_tree *tree=NULL;
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proto_item *item=NULL;
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char token[4];
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guint32 parameter;
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col_set_str(pinfo->cinfo, COL_PROTOCOL, "DISTCC ");
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col_clear(pinfo->cinfo, COL_INFO);
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if (parent_tree) {
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item = proto_tree_add_item(parent_tree, proto_distcc, tvb, offset,
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-1, FALSE);
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tree = proto_item_add_subtree(item, ett_distcc);
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}
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while(1){
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/* we must have at least 12 bytes so we can read the
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token and the parameter */
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if(tvb_length_remaining(tvb, offset)<12){
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return;
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}
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/* read the token */
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tvb_memcpy(tvb, token, offset, 4);
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offset+=4;
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/* read the parameter */
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if (sscanf(tvb_get_ptr(tvb, offset, 8), "%08x", ¶meter) != 1)
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return;
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offset+=8;
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if(!strncmp(token, "DIST", 4)){
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offset=dissect_distcc_dist(tvb, pinfo, tree, offset, parameter);
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} else if(!strncmp(token, "ARGC", 4)){
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offset=dissect_distcc_argc(tvb, pinfo, tree, offset, parameter);
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} else if(!strncmp(token, "ARGV", 4)){
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offset=dissect_distcc_argv(tvb, pinfo, tree, offset, parameter);
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} else if(!strncmp(token, "DOTI", 4)){
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offset=dissect_distcc_doti(tvb, pinfo, tree, offset, parameter);
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} else if(!strncmp(token, "DONE", 4)){
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offset=dissect_distcc_done(tvb, pinfo, tree, offset, parameter);
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} else if(!strncmp(token, "STAT", 4)){
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offset=dissect_distcc_stat(tvb, pinfo, tree, offset, parameter);
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} else if(!strncmp(token, "SERR", 4)){
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offset=dissect_distcc_serr(tvb, pinfo, tree, offset, parameter);
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} else if(!strncmp(token, "SOUT", 4)){
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offset=dissect_distcc_sout(tvb, pinfo, tree, offset, parameter);
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} else if(!strncmp(token, "DOTO", 4)){
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offset=dissect_distcc_doto(tvb, pinfo, tree, offset, parameter);
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} else {
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call_dissector(data_handle, tvb, pinfo, tree);
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return;
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}
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}
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}
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/* Register protocol with Wireshark. */
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void
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proto_register_distcc(void)
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{
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static hf_register_info hf[] = {
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{&hf_distcc_version,
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{"DISTCC Version", "distcc.version",
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FT_UINT32, BASE_DEC, NULL, 0x0, NULL, HFILL }
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},
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{&hf_distcc_argc,
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{"ARGC", "distcc.argc",
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FT_UINT32, BASE_DEC, NULL, 0x0, "Number of arguments", HFILL }
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},
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{&hf_distcc_argv,
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{"ARGV", "distcc.argv",
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FT_STRING, BASE_NONE, NULL, 0x0, "ARGV argument", HFILL }
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},
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{&hf_distcc_doti_source,
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{"Source", "distcc.doti_source",
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FT_STRING, BASE_NONE, NULL, 0x0, "DOTI Preprocessed Source File (.i)", HFILL }
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},
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{&hf_distcc_stat,
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{"Status", "distcc.status",
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FT_UINT32, BASE_DEC, NULL, 0x0, "Unix wait status for command completion", HFILL }
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},
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{&hf_distcc_serr,
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{"SERR", "distcc.serr",
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FT_STRING, BASE_NONE, NULL, 0x0, "STDERR output", HFILL }
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},
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{&hf_distcc_sout,
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{"SOUT", "distcc.sout",
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FT_STRING, BASE_NONE, NULL, 0x0, "STDOUT output", HFILL }
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},
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{&hf_distcc_doto_object,
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{"Object", "distcc.doto_object",
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FT_BYTES, BASE_NONE, NULL, 0x0, "DOTO Compiled object file (.o)", HFILL }
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}
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};
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static gint *ett[] = {
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&ett_distcc,
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};
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module_t *distcc_module;
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proto_distcc = proto_register_protocol("Distcc Distributed Compiler",
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"DISTCC", "distcc");
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proto_register_field_array(proto_distcc, hf, array_length(hf));
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proto_register_subtree_array(ett, array_length(ett));
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distcc_module = prefs_register_protocol(proto_distcc,
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proto_reg_handoff_distcc);
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prefs_register_uint_preference(distcc_module, "tcp.port",
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"DISTCC TCP Port",
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"Set the TCP port for DISTCC messages",
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10,
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&glb_distcc_tcp_port);
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prefs_register_bool_preference(distcc_module, "desegment_distcc_over_tcp",
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"Reassemble DISTCC-over-TCP messages\nspanning multiple TCP segments",
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"Whether the DISTCC 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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&distcc_desegment);
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}
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void
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proto_reg_handoff_distcc(void)
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{
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static gboolean registered_dissector = FALSE;
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static int distcc_tcp_port;
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static dissector_handle_t distcc_handle;
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if (!registered_dissector) {
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/*
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* We haven't registered the dissector yet; get a handle
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* for it.
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*/
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distcc_handle = create_dissector_handle(dissect_distcc,
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proto_distcc);
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data_handle = find_dissector("data");
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registered_dissector = TRUE;
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} else {
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/*
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* We've registered the dissector with a TCP port number
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* of "distcc_tcp_port"; we might be changing the TCP port
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* number, so remove that registration.
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*/
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dissector_delete_uint("tcp.port", distcc_tcp_port, distcc_handle);
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}
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distcc_tcp_port = glb_distcc_tcp_port;
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dissector_add_uint("tcp.port", distcc_tcp_port, distcc_handle);
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}
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