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wireshark/epan/dissectors/packet-h1.c
Michael Mann 1e60d63c8c Create call_data_dissector() to call data dissector. 
This saves many dissectors the need to find the data dissector and store a handle to it.

There were also some that were finding it, but not using it.
For others this was the only reason for their handoff function, so it could be eliminated.

Change-Id: I5d3f951ee1daa3d30c060d21bd12bbc881a8027b
Reviewed-on: https://code.wireshark.org/review/14530
Petri-Dish: Michael Mann <mmann78@netscape.net>
Reviewed-by: Michael Mann <mmann78@netscape.net>
2016-03-20 17:38:03 +00:00

279 lines
9 KiB
C
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/* packet-h1.c
* Routines for Sinec H1 packet disassembly
* Gerrit Gehnen <G.Gehnen@atrie.de>
*
* 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.
*/
#include "config.h"
#include <epan/packet.h>
#include <epan/exceptions.h>
void proto_register_h1(void);
void proto_reg_handoff_h1(void);
static int proto_h1 = -1;
static int hf_h1_header = -1;
static int hf_h1_len = -1;
static int hf_h1_block_type = -1;
static int hf_h1_block_len = -1;
static int hf_h1_opcode = -1;
static int hf_h1_dbnr = -1;
static int hf_h1_dwnr = -1;
static int hf_h1_dlen = -1;
static int hf_h1_org = -1;
static int hf_h1_response_value = -1;
#define EMPTY_BLOCK 0xFF
#define OPCODE_BLOCK 0x01
#define REQUEST_BLOCK 0x03
#define RESPONSE_BLOCK 0x0F
static const value_string block_type_vals[] = {
{ EMPTY_BLOCK, "Empty Block" },
{ OPCODE_BLOCK, "Opcode Block" },
{ REQUEST_BLOCK, "Request Block" },
{ RESPONSE_BLOCK, "Response Block" },
{0, NULL}
};
static const value_string opcode_vals[] = {
{3, "Write Request"},
{4, "Write Response"},
{5, "Read Request"},
{6, "Read Response"},
{0, NULL}
};
static const value_string org_vals[] = {
{0x01, "DB"},
{0x02, "MB"},
{0x03, "EB"},
{0x04, "AB"},
{0x05, "PB"},
{0x06, "ZB"},
{0x07, "TB"},
{0x08, "BS"},
{0x09, "AS"},
{0x0a, "DX"},
{0x10, "DE"},
{0x11, "QB"},
{0, NULL}
};
static const value_string returncode_vals[] = {
{0x00, "No error"},
{0x02, "Requested block does not exist"},
{0x03, "Requested block too small"},
{0xFF, "Error, reason unknown"},
{0, NULL}
};
static gint ett_h1 = -1;
static gint ett_block = -1;
static gboolean dissect_h1(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree, void *data _U_)
{
proto_tree *h1_tree, *block_tree;
proto_item *h1_ti, *block_ti;
gint offset = 0, offset_block_start;
guint8 h1_len;
guint8 block_type, block_len;
tvbuff_t *next_tvb;
if (tvb_captured_length(tvb) < 2) {
/* Not enough data captured to hold the "S5" header; don't try
to interpret it as H1. */
return FALSE;
}
if (!(tvb_get_guint8(tvb, 0) == 'S' && tvb_get_guint8(tvb, 1) == '5')) {
return FALSE;
}
col_set_str (pinfo->cinfo, COL_PROTOCOL, "H1");
col_set_str(pinfo->cinfo, COL_INFO, "S5: ");
h1_ti = proto_tree_add_item(tree, proto_h1, tvb, offset, -1, ENC_NA);
h1_tree = proto_item_add_subtree(h1_ti, ett_h1);
proto_tree_add_item(h1_tree, hf_h1_header, tvb, offset, 2, ENC_BIG_ENDIAN);
offset += 2;
h1_len = tvb_get_guint8(tvb, offset);
proto_tree_add_item(h1_tree, hf_h1_len, tvb, offset, 1, ENC_BIG_ENDIAN);
proto_item_set_len(h1_ti, h1_len);
offset++;
while (offset < h1_len) {
offset_block_start = offset;
block_type = tvb_get_guint8(tvb, offset);
block_len = tvb_get_guint8(tvb, offset+1);
if (!try_val_to_str(block_type, block_type_vals)) {
/* XXX - should we skip unknown blocks? */
return FALSE;
}
if (block_len == 0) {
/* XXX - expert info */
break;
}
block_tree = proto_tree_add_subtree_format(h1_tree,
tvb, offset, -1, ett_block, &block_ti, "%s",
val_to_str_const(block_type, block_type_vals, "Unknown block"));
proto_tree_add_item(block_tree, hf_h1_block_type,
tvb, offset, 1, ENC_BIG_ENDIAN);
/* we keep increasing offset as we go though the block
however, to find the beginning of the next block,
we use the current block's start offset and its length field */
offset++;
proto_tree_add_item(block_tree, hf_h1_block_len,
tvb, offset, 1, ENC_BIG_ENDIAN);
proto_item_set_len(block_ti, block_len);
offset++;
switch (block_type) {
case OPCODE_BLOCK:
proto_tree_add_item(block_tree, hf_h1_opcode,
tvb, offset, 1, ENC_BIG_ENDIAN);
col_append_str (pinfo->cinfo, COL_INFO,
val_to_str (tvb_get_guint8(tvb, offset),
opcode_vals, "Unknown Opcode (0x%2.2x)"));
break;
case REQUEST_BLOCK:
proto_tree_add_item(block_tree, hf_h1_org, tvb,
offset, 1, ENC_BIG_ENDIAN);
col_append_fstr(pinfo->cinfo, COL_INFO, " %s",
val_to_str (tvb_get_guint8(tvb, offset),
org_vals,"Unknown Type (0x%2.2x)"));
offset++;
proto_tree_add_item(block_tree, hf_h1_dbnr, tvb,
offset, 1, ENC_BIG_ENDIAN);
col_append_fstr(pinfo->cinfo, COL_INFO, " %d",
tvb_get_guint8(tvb, offset));
offset++;
proto_tree_add_item(block_tree, hf_h1_dwnr, tvb,
offset, 2, ENC_BIG_ENDIAN);
col_append_fstr (pinfo->cinfo, COL_INFO, " DW %d",
tvb_get_ntohs(tvb, offset));
offset += 2;
proto_tree_add_item(block_tree, hf_h1_dlen, tvb,
offset, 2, ENC_BIG_ENDIAN);
col_append_fstr (pinfo->cinfo, COL_INFO, " Count %d",
tvb_get_ntohs(tvb, offset));
break;
case RESPONSE_BLOCK:
proto_tree_add_item(block_tree, hf_h1_response_value,
tvb, offset, 1, ENC_BIG_ENDIAN);
col_append_fstr (pinfo->cinfo, COL_INFO, " %s",
val_to_str (tvb_get_guint8(tvb, offset),
returncode_vals,"Unknown Returncode (0x%2.2x"));
break;
}
offset = offset_block_start + block_len; /* see the comment above */
}
if (tvb_reported_length_remaining(tvb, offset) > 0) {
next_tvb = tvb_new_subset_remaining(tvb, offset);
call_data_dissector(next_tvb, pinfo, tree);
}
return TRUE;
}
void
proto_register_h1 (void)
{
static hf_register_info hf[] = {
{&hf_h1_header,
{"H1-Header", "h1.header", FT_UINT16, BASE_HEX, NULL, 0x0,
NULL, HFILL }},
{&hf_h1_len,
{"Length indicator", "h1.len", FT_UINT16, BASE_DEC, NULL, 0x0,
NULL, HFILL }},
{&hf_h1_block_type,
{"Block type", "h1.block_type", FT_UINT8, BASE_HEX, VALS(block_type_vals), 0x0,
NULL, HFILL }},
{&hf_h1_block_len,
{"Block length", "h1.block_len", FT_UINT8, BASE_DEC, NULL, 0x0, NULL, HFILL }},
{&hf_h1_opcode,
{"Opcode", "h1.opcode", FT_UINT8, BASE_HEX, VALS (opcode_vals), 0x0,
NULL, HFILL }},
{&hf_h1_org,
{"Memory type", "h1.org", FT_UINT8, BASE_HEX, VALS (org_vals), 0x0,
NULL, HFILL }},
{&hf_h1_dbnr,
{"Memory block number", "h1.dbnr", FT_UINT8, BASE_DEC, NULL, 0x0, NULL, HFILL }},
{&hf_h1_dwnr,
{"Address within memory block", "h1.dwnr", FT_UINT16, BASE_DEC, NULL, 0x0,
NULL, HFILL }},
{&hf_h1_dlen,
{"Length in words", "h1.dlen", FT_INT16, BASE_DEC, NULL, 0x0, NULL, HFILL }},
{&hf_h1_response_value,
{"Response value", "h1.resvalue", FT_UINT8, BASE_DEC,
VALS (returncode_vals), 0x0, NULL, HFILL }}
};
static gint *ett[] = {
&ett_h1,
&ett_block,
};
proto_h1 = proto_register_protocol ("Sinec H1 Protocol", "H1", "h1");
proto_register_field_array (proto_h1, hf, array_length (hf));
proto_register_subtree_array (ett, array_length (ett));
}
void
proto_reg_handoff_h1(void)
{
heur_dissector_add("cotp", dissect_h1,
"Sinec H1 over COTP", "hi_cotp", proto_h1, HEURISTIC_ENABLE);
heur_dissector_add("cotp_is", dissect_h1,
"Sinec H1 over COTP (inactive subset)", "hi_cotp_is", proto_h1, HEURISTIC_ENABLE);
heur_dissector_add("tcp", dissect_h1,
"Sinec H1 over TCP", "hi_tcp", proto_h1, HEURISTIC_ENABLE);
}
/*
* Editor modelines - http://www.wireshark.org/tools/modelines.html
*
* Local Variables:
* c-basic-offset: 4
* tab-width: 8
* indent-tabs-mode: nil
* End:
*
* ex: set shiftwidth=4 tabstop=8 expandtab:
* :indentSize=4:tabSize=8:noTabs=true:
*/
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