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wireshark/epan/dissectors/packet-distcc.c

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/* packet-distcc.c
* Routines for distcc dissection
* Copyright 2003, Brad Hards <bradh@frogmouth.net>
* Copyright 2003, Ronnie Sahlberg, added TCP desegmentation.
*
* Wireshark - Network traffic analyzer
* By Gerald Combs <gerald@wireshark.org>
* Copyright 1998 Gerald Combs
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License
* as published by the Free Software Foundation; either version 2
* of the License, or (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
*/
/* This dissector supports version 1 of the DISTCC protocol */
#include "config.h"
#include <stdio.h>
#include <epan/packet.h>
#include <epan/expert.h>
#include <epan/prefs.h>
static int proto_distcc = -1;
static int hf_distcc_version = -1;
static int hf_distcc_argc = -1;
static int hf_distcc_argv = -1;
static int hf_distcc_doti_source = -1;
static int hf_distcc_stat = -1;
static int hf_distcc_serr = -1;
static int hf_distcc_sout = -1;
static int hf_distcc_doto_object = -1;
static gint ett_distcc = -1;
static expert_field ei_distcc_short_pdu = EI_INIT;
static dissector_handle_t data_handle;
static gboolean distcc_desegment = TRUE;
#define TCP_PORT_DISTCC 3632
static guint glb_distcc_tcp_port = TCP_PORT_DISTCC;
void proto_register_distcc(void);
extern void proto_reg_handoff_distcc(void);
#define CHECK_PDU_LEN(x) \
if(parameter>tvb_captured_length_remaining(tvb, offset) || parameter < 1){\
len=tvb_captured_length_remaining(tvb, offset);\
col_append_str(pinfo->cinfo, COL_INFO, "[Short" x " PDU]");\
} \
tvb_ensure_bytes_exist(tvb, offset, len);
#define DESEGMENT_TCP(x) \
if(distcc_desegment && pinfo->can_desegment){\
/* only attempt reassembly if we have the full segment */\
if(tvb_captured_length_remaining(tvb, offset)==tvb_reported_length_remaining(tvb, offset)){\
if(parameter>tvb_captured_length_remaining(tvb, offset)){\
proto_tree_add_expert_format(tree, pinfo, &ei_distcc_short_pdu, tvb, offset-12, -1, "[Short " x " PDU]");\
pinfo->desegment_offset=offset-12;\
pinfo->desegment_len=parameter-tvb_captured_length_remaining(tvb, offset);\
return offset+len;\
}\
}\
}
static int
dissect_distcc_dist(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree, int offset, guint32 parameter)
{
proto_tree_add_uint_format(tree, hf_distcc_version, tvb, offset-12, 12, parameter, "DIST: %d", parameter);
col_append_fstr(pinfo->cinfo, COL_INFO, "DIST:%d ", parameter);
return offset;
}
static int
dissect_distcc_done(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree, int offset, guint32 parameter)
{
proto_tree_add_uint_format(tree, hf_distcc_version, tvb, offset-12, 12, parameter, "DONE: %d", parameter);
col_append_fstr(pinfo->cinfo, COL_INFO, "DONE:%d ", parameter);
return offset;
}
static int
dissect_distcc_stat(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree, int offset, guint32 parameter)
{
proto_tree_add_uint_format(tree, hf_distcc_stat, tvb, offset-12, 12, parameter, "STAT: %d", parameter);
col_append_fstr(pinfo->cinfo, COL_INFO, "STAT:%d ", parameter);
return offset;
}
static int
dissect_distcc_argc(tvbuff_t *tvb, packet_info *pinfo _U_, proto_tree *tree, int offset, guint32 parameter)
{
proto_tree_add_uint(tree, hf_distcc_argc, tvb, offset-12, 12, parameter);
col_append_fstr(pinfo->cinfo, COL_INFO, "ARGC:%d ", parameter);
return offset;
}
static int
dissect_distcc_argv(tvbuff_t *tvb, packet_info *pinfo _U_, proto_tree *tree, int offset, gint parameter)
{
char argv[256];
int argv_len;
gint len=parameter;
proto_item* ti;
CHECK_PDU_LEN("ARGV");
/* see if we need to desegment the PDU */
DESEGMENT_TCP("ARGV");
argv_len=len>255?255:len;
tvb_memcpy(tvb, argv, offset, argv_len);
argv[argv_len]=0;
ti = proto_tree_add_item(tree, hf_distcc_argv, tvb, offset, len, ENC_ASCII|ENC_NA);
col_append_fstr(pinfo->cinfo, COL_INFO, "%s ", argv);
if(len!=parameter){
expert_add_info_format(pinfo, ti, &ei_distcc_short_pdu, "[Short ARGV PDU]");
}
return offset+len;
}
static int
dissect_distcc_serr(tvbuff_t *tvb, packet_info *pinfo _U_, proto_tree *tree, int offset, gint parameter)
{
char argv[256];
int argv_len;
gint len=parameter;
proto_item* ti;
CHECK_PDU_LEN("SERR");
/* see if we need to desegment the PDU */
DESEGMENT_TCP("SERR");
argv_len=len>255?255:len;
tvb_memcpy(tvb, argv, offset, argv_len);
argv[argv_len]=0;
ti = proto_tree_add_item(tree, hf_distcc_serr, tvb, offset, len, ENC_ASCII|ENC_NA);
col_append_fstr(pinfo->cinfo, COL_INFO, "SERR:%s ", argv);
if(len!=parameter){
expert_add_info_format(pinfo, ti, &ei_distcc_short_pdu, "[Short SERR PDU]");
}
return offset+len;
}
static int
dissect_distcc_sout(tvbuff_t *tvb, packet_info *pinfo _U_, proto_tree *tree, int offset, gint parameter)
{
char argv[256];
int argv_len;
gint len=parameter;
proto_item* ti;
CHECK_PDU_LEN("SOUT");
/* see if we need to desegment the PDU */
DESEGMENT_TCP("SOUT");
argv_len=len>255?255:len;
tvb_memcpy(tvb, argv, offset, argv_len);
argv[argv_len]=0;
ti = proto_tree_add_item(tree, hf_distcc_sout, tvb, offset, len, ENC_ASCII|ENC_NA);
col_append_fstr(pinfo->cinfo, COL_INFO, "SOUT:%s ", argv);
if(len!=parameter){
expert_add_info_format(pinfo, ti, &ei_distcc_short_pdu, "[Short SOUT PDU]");
}
return offset+len;
}
static int
dissect_distcc_doti(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree, int offset, gint parameter)
{
gint len=parameter;
proto_item* ti;
CHECK_PDU_LEN("DOTI");
/* see if we need to desegment the PDU */
DESEGMENT_TCP("DOTI");
col_append_str(pinfo->cinfo, COL_INFO, "DOTI source ");
ti = proto_tree_add_item(tree, hf_distcc_doti_source, tvb, offset, len, ENC_ASCII|ENC_NA);
if(len!=parameter){
expert_add_info_format(pinfo, ti, &ei_distcc_short_pdu, "[Short DOTI PDU]");
}
return offset+len;
}
static int
dissect_distcc_doto(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree, int offset, gint parameter)
{
gint len=parameter;
proto_item* ti;
CHECK_PDU_LEN("DOTO");
/* see if we need to desegment the PDU */
DESEGMENT_TCP("DOTO");
col_append_str(pinfo->cinfo, COL_INFO, "DOTO object ");
ti = proto_tree_add_item(tree, hf_distcc_doto_object, tvb, offset, len, ENC_NA);
if(len!=parameter){
expert_add_info_format(pinfo, ti, &ei_distcc_short_pdu, "[Short DOTO PDU]");
}
return offset+len;
}
/* Packet dissection routine called by tcp (& udp) when port 3632 detected */
static int
dissect_distcc(tvbuff_t *tvb, packet_info *pinfo, proto_tree *parent_tree, void* data _U_)
{
int offset=0;
proto_tree *tree=NULL;
proto_item *item=NULL;
char buf[13];
guint32 parameter;
col_set_str(pinfo->cinfo, COL_PROTOCOL, "DISTCC ");
col_clear(pinfo->cinfo, COL_INFO);
if (parent_tree) {
item = proto_tree_add_item(parent_tree, proto_distcc, tvb, offset,
-1, ENC_NA);
tree = proto_item_add_subtree(item, ett_distcc);
}
while (TRUE) {
/* read the raw token (4 bytes) and parameter (8 bytes) */
tvb_memcpy(tvb, buf, offset, 12);
buf[12] = '\0';
offset+=12;
/* scan the parameter */
if (sscanf(buf + 4, "%08x", &parameter) != 1)
return offset;
if(!strncmp(buf, "DIST", 4)){
offset=dissect_distcc_dist(tvb, pinfo, tree, offset, parameter);
} else if(!strncmp(buf, "ARGC", 4)){
offset=dissect_distcc_argc(tvb, pinfo, tree, offset, parameter);
} else if(!strncmp(buf, "ARGV", 4)){
offset=dissect_distcc_argv(tvb, pinfo, tree, offset, parameter);
} else if(!strncmp(buf, "DOTI", 4)){
offset=dissect_distcc_doti(tvb, pinfo, tree, offset, parameter);
} else if(!strncmp(buf, "DONE", 4)){
offset=dissect_distcc_done(tvb, pinfo, tree, offset, parameter);
} else if(!strncmp(buf, "STAT", 4)){
offset=dissect_distcc_stat(tvb, pinfo, tree, offset, parameter);
} else if(!strncmp(buf, "SERR", 4)){
offset=dissect_distcc_serr(tvb, pinfo, tree, offset, parameter);
} else if(!strncmp(buf, "SOUT", 4)){
offset=dissect_distcc_sout(tvb, pinfo, tree, offset, parameter);
} else if(!strncmp(buf, "DOTO", 4)){
offset=dissect_distcc_doto(tvb, pinfo, tree, offset, parameter);
} else {
call_dissector(data_handle, tvb, pinfo, tree);
return tvb_captured_length(tvb);
}
}
return tvb_captured_length(tvb);
}
/* Register protocol with Wireshark. */
void
proto_register_distcc(void)
{
static hf_register_info hf[] = {
{&hf_distcc_version,
{"DISTCC Version", "distcc.version",
FT_UINT32, BASE_DEC, NULL, 0x0, NULL, HFILL }
},
{&hf_distcc_argc,
{"ARGC", "distcc.argc",
FT_UINT32, BASE_DEC, NULL, 0x0, "Number of arguments", HFILL }
},
{&hf_distcc_argv,
{"ARGV", "distcc.argv",
FT_STRING, BASE_NONE, NULL, 0x0, "ARGV argument", HFILL }
},
{&hf_distcc_doti_source,
{"Source", "distcc.doti_source",
FT_STRING, BASE_NONE, NULL, 0x0, "DOTI Preprocessed Source File (.i)", HFILL }
},
{&hf_distcc_stat,
{"Status", "distcc.status",
FT_UINT32, BASE_DEC, NULL, 0x0, "Unix wait status for command completion", HFILL }
},
{&hf_distcc_serr,
{"SERR", "distcc.serr",
FT_STRING, BASE_NONE, NULL, 0x0, "STDERR output", HFILL }
},
{&hf_distcc_sout,
{"SOUT", "distcc.sout",
FT_STRING, BASE_NONE, NULL, 0x0, "STDOUT output", HFILL }
},
{&hf_distcc_doto_object,
{"Object", "distcc.doto_object",
FT_BYTES, BASE_NONE, NULL, 0x0, "DOTO Compiled object file (.o)", HFILL }
}
};
static gint *ett[] = {
&ett_distcc,
};
static ei_register_info ei[] = {
{ &ei_distcc_short_pdu, { "distcc.short_pdu", PI_MALFORMED, PI_ERROR, "Short PDU", EXPFILL }},
};
module_t *distcc_module;
expert_module_t* expert_distcc;
proto_distcc = proto_register_protocol("Distcc Distributed Compiler", "DISTCC", "distcc");
proto_register_field_array(proto_distcc, hf, array_length(hf));
proto_register_subtree_array(ett, array_length(ett));
expert_distcc = expert_register_protocol(proto_distcc);
expert_register_field_array(expert_distcc, ei, array_length(ei));
distcc_module = prefs_register_protocol(proto_distcc,
proto_reg_handoff_distcc);
prefs_register_uint_preference(distcc_module, "tcp.port",
"DISTCC TCP Port",
"Set the TCP port for DISTCC messages",
10,
&glb_distcc_tcp_port);
prefs_register_bool_preference(distcc_module, "desegment_distcc_over_tcp",
"Reassemble DISTCC-over-TCP messages\nspanning multiple TCP segments",
"Whether the DISTCC dissector should reassemble messages spanning multiple TCP segments."
" To use this option, you must also enable \"Allow subdissectors to reassemble TCP streams\" in the TCP protocol settings.",
&distcc_desegment);
}
void
proto_reg_handoff_distcc(void)
{
static gboolean registered_dissector = FALSE;
static int distcc_tcp_port;
static dissector_handle_t distcc_handle;
if (!registered_dissector) {
/*
* We haven't registered the dissector yet; get a handle
* for it.
*/
distcc_handle = create_dissector_handle(dissect_distcc,
proto_distcc);
data_handle = find_dissector("data");
registered_dissector = TRUE;
} else {
/*
* We've registered the dissector with a TCP port number
* of "distcc_tcp_port"; we might be changing the TCP port
* number, so remove that registration.
*/
dissector_delete_uint("tcp.port", distcc_tcp_port, distcc_handle);
}
distcc_tcp_port = glb_distcc_tcp_port;
dissector_add_uint("tcp.port", distcc_tcp_port, distcc_handle);
}
/*
* Editor modelines - http://www.wireshark.org/tools/modelines.html
*
* Local variables:
* c-basic-offset: 4
* tab-width: 8
* indent-tabs-mode: nil
* End:
*
* vi: set shiftwidth=4 tabstop=8 expandtab:
* :indentSize=4:tabSize=8:noTabs=true:
*/
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