forked from osmocom/wireshark
283 lines
9.1 KiB
C
283 lines
9.1 KiB
C
/* packet-h1.c
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* Routines for Sinec H1 packet disassembly
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* Gerrit Gehnen <G.Gehnen@atrie.de>
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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., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
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*/
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#include "config.h"
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#include <epan/packet.h>
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#include <epan/exceptions.h>
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void proto_register_h1(void);
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void proto_reg_handoff_h1(void);
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static int proto_h1 = -1;
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static int hf_h1_header = -1;
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static int hf_h1_len = -1;
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static int hf_h1_block_type = -1;
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static int hf_h1_block_len = -1;
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static int hf_h1_opcode = -1;
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static int hf_h1_dbnr = -1;
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static int hf_h1_dwnr = -1;
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static int hf_h1_dlen = -1;
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static int hf_h1_org = -1;
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static int hf_h1_response_value = -1;
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static dissector_handle_t data_handle;
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#define EMPTY_BLOCK 0xFF
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#define OPCODE_BLOCK 0x01
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#define REQUEST_BLOCK 0x03
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#define RESPONSE_BLOCK 0x0F
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static const value_string block_type_vals[] = {
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{ EMPTY_BLOCK, "Empty Block" },
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{ OPCODE_BLOCK, "Opcode Block" },
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{ REQUEST_BLOCK, "Request Block" },
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{ RESPONSE_BLOCK, "Response Block" },
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{0, NULL}
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};
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static const value_string opcode_vals[] = {
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{3, "Write Request"},
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{4, "Write Response"},
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{5, "Read Request"},
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{6, "Read Response"},
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{0, NULL}
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};
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static const value_string org_vals[] = {
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{0x01, "DB"},
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{0x02, "MB"},
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{0x03, "EB"},
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{0x04, "AB"},
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{0x05, "PB"},
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{0x06, "ZB"},
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{0x07, "TB"},
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{0x08, "BS"},
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{0x09, "AS"},
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{0x0a, "DX"},
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{0x10, "DE"},
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{0x11, "QB"},
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{0, NULL}
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};
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static const value_string returncode_vals[] = {
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{0x00, "No error"},
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{0x02, "Requested block does not exist"},
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{0x03, "Requested block too small"},
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{0xFF, "Error, reason unknown"},
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{0, NULL}
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};
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static gint ett_h1 = -1;
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static gint ett_block = -1;
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static gboolean dissect_h1(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree, void *data _U_)
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{
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proto_tree *h1_tree, *block_tree;
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proto_item *h1_ti, *block_ti;
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gint offset = 0, offset_block_start;
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guint8 h1_len;
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guint8 block_type, block_len;
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tvbuff_t *next_tvb;
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if (tvb_captured_length(tvb) < 2) {
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/* Not enough data captured to hold the "S5" header; don't try
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to interpret it as H1. */
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return FALSE;
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}
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if (!(tvb_get_guint8(tvb, 0) == 'S' && tvb_get_guint8(tvb, 1) == '5')) {
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return FALSE;
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}
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col_set_str (pinfo->cinfo, COL_PROTOCOL, "H1");
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col_set_str(pinfo->cinfo, COL_INFO, "S5: ");
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h1_ti = proto_tree_add_item(tree, proto_h1, tvb, offset, -1, ENC_NA);
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h1_tree = proto_item_add_subtree(h1_ti, ett_h1);
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proto_tree_add_item(h1_tree, hf_h1_header, tvb, offset, 2, ENC_BIG_ENDIAN);
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offset += 2;
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h1_len = tvb_get_guint8(tvb, offset);
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proto_tree_add_item(h1_tree, hf_h1_len, tvb, offset, 1, ENC_BIG_ENDIAN);
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proto_item_set_len(h1_ti, h1_len);
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offset++;
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while (offset < h1_len) {
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offset_block_start = offset;
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block_type = tvb_get_guint8(tvb, offset);
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block_len = tvb_get_guint8(tvb, offset+1);
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if (!try_val_to_str(block_type, block_type_vals)) {
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/* XXX - should we skip unknown blocks? */
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return FALSE;
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}
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if (block_len == 0) {
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/* XXX - expert info */
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break;
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}
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block_tree = proto_tree_add_subtree_format(h1_tree,
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tvb, offset, -1, ett_block, &block_ti, "%s",
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val_to_str_const(block_type, block_type_vals, "Unknown block"));
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proto_tree_add_item(block_tree, hf_h1_block_type,
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tvb, offset, 1, ENC_BIG_ENDIAN);
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/* we keep increasing offset as we go though the block
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however, to find the beginning of the next block,
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we use the current block's start offset and its length field */
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offset++;
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proto_tree_add_item(block_tree, hf_h1_block_len,
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tvb, offset, 1, ENC_BIG_ENDIAN);
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proto_item_set_len(block_ti, block_len);
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offset++;
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switch (block_type) {
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case OPCODE_BLOCK:
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proto_tree_add_item(block_tree, hf_h1_opcode,
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tvb, offset, 1, ENC_BIG_ENDIAN);
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col_append_str (pinfo->cinfo, COL_INFO,
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val_to_str (tvb_get_guint8(tvb, offset),
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opcode_vals, "Unknown Opcode (0x%2.2x)"));
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break;
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case REQUEST_BLOCK:
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proto_tree_add_item(block_tree, hf_h1_org, tvb,
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offset, 1, ENC_BIG_ENDIAN);
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col_append_fstr(pinfo->cinfo, COL_INFO, " %s",
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val_to_str (tvb_get_guint8(tvb, offset),
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org_vals,"Unknown Type (0x%2.2x)"));
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offset++;
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proto_tree_add_item(block_tree, hf_h1_dbnr, tvb,
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offset, 1, ENC_BIG_ENDIAN);
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col_append_fstr(pinfo->cinfo, COL_INFO, " %d",
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tvb_get_guint8(tvb, offset));
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offset++;
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proto_tree_add_item(block_tree, hf_h1_dwnr, tvb,
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offset, 2, ENC_BIG_ENDIAN);
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col_append_fstr (pinfo->cinfo, COL_INFO, " DW %d",
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tvb_get_ntohs(tvb, offset));
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offset += 2;
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proto_tree_add_item(block_tree, hf_h1_dlen, tvb,
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offset, 2, ENC_BIG_ENDIAN);
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col_append_fstr (pinfo->cinfo, COL_INFO, " Count %d",
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tvb_get_ntohs(tvb, offset));
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break;
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case RESPONSE_BLOCK:
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proto_tree_add_item(block_tree, hf_h1_response_value,
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tvb, offset, 1, ENC_BIG_ENDIAN);
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col_append_fstr (pinfo->cinfo, COL_INFO, " %s",
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val_to_str (tvb_get_guint8(tvb, offset),
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returncode_vals,"Unknown Returncode (0x%2.2x"));
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break;
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}
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offset = offset_block_start + block_len; /* see the comment above */
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}
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if (tvb_reported_length_remaining(tvb, offset) > 0) {
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next_tvb = tvb_new_subset_remaining(tvb, offset);
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call_dissector(data_handle, next_tvb, pinfo, tree);
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}
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return TRUE;
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}
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void
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proto_register_h1 (void)
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{
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static hf_register_info hf[] = {
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{&hf_h1_header,
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{"H1-Header", "h1.header", FT_UINT16, BASE_HEX, NULL, 0x0,
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NULL, HFILL }},
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{&hf_h1_len,
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{"Length indicator", "h1.len", FT_UINT16, BASE_DEC, NULL, 0x0,
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NULL, HFILL }},
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{&hf_h1_block_type,
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{"Block type", "h1.block_type", FT_UINT8, BASE_HEX, VALS(block_type_vals), 0x0,
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NULL, HFILL }},
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{&hf_h1_block_len,
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{"Block length", "h1.block_len", FT_UINT8, BASE_DEC, NULL, 0x0, NULL, HFILL }},
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{&hf_h1_opcode,
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{"Opcode", "h1.opcode", FT_UINT8, BASE_HEX, VALS (opcode_vals), 0x0,
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NULL, HFILL }},
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{&hf_h1_org,
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{"Memory type", "h1.org", FT_UINT8, BASE_HEX, VALS (org_vals), 0x0,
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NULL, HFILL }},
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{&hf_h1_dbnr,
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{"Memory block number", "h1.dbnr", FT_UINT8, BASE_DEC, NULL, 0x0, NULL, HFILL }},
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{&hf_h1_dwnr,
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{"Address within memory block", "h1.dwnr", FT_UINT16, BASE_DEC, NULL, 0x0,
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NULL, HFILL }},
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{&hf_h1_dlen,
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{"Length in words", "h1.dlen", FT_INT16, BASE_DEC, NULL, 0x0, NULL, HFILL }},
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{&hf_h1_response_value,
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{"Response value", "h1.resvalue", FT_UINT8, BASE_DEC,
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VALS (returncode_vals), 0x0, NULL, HFILL }}
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};
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static gint *ett[] = {
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&ett_h1,
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&ett_block,
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};
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proto_h1 = proto_register_protocol ("Sinec H1 Protocol", "H1", "h1");
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proto_register_field_array (proto_h1, hf, array_length (hf));
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proto_register_subtree_array (ett, array_length (ett));
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}
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void
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proto_reg_handoff_h1(void)
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{
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heur_dissector_add("cotp", dissect_h1,
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"Sinec H1 over COTP", "hi_cotp", proto_h1, HEURISTIC_ENABLE);
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heur_dissector_add("cotp_is", dissect_h1,
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"Sinec H1 over COTP (inactive subset)", "hi_cotp_is", proto_h1, HEURISTIC_ENABLE);
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heur_dissector_add("tcp", dissect_h1,
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"Sinec H1 over TCP", "hi_tcp", proto_h1, HEURISTIC_ENABLE);
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data_handle = find_dissector("data");
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}
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/*
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* Editor modelines - http://www.wireshark.org/tools/modelines.html
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*
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* Local Variables:
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* c-basic-offset: 4
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* tab-width: 4
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* indent-tabs-mode: nil
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* End:
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*
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* ex: set shiftwidth=4 tabstop=4 expandtab:
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* :indentSize=4:tabSize=4:noTabs=true:
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*/
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