2 * Routines for Sinec H1 packet disassembly
3 * Gerrit Gehnen <G.Gehnen@atrie.de>
5 * $Id: packet-h1.c,v 1.18 2001/01/22 08:03:45 guy Exp $
7 * Ethereal - Network traffic analyzer
8 * By Gerald Combs <gerald@zing.org>
9 * Copyright 1998 Gerald Combs
12 * This program is free software; you can redistribute it and/or
13 * modify it under the terms of the GNU General Public License
14 * as published by the Free Software Foundation; either version 2
15 * of the License, or (at your option) any later version.
17 * This program is distributed in the hope that it will be useful,
18 * but WITHOUT ANY WARRANTY; without even the implied warranty of
19 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
20 * GNU General Public License for more details.
22 * You should have received a copy of the GNU General Public License
23 * along with this program; if not, write to the Free Software
24 * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
31 #ifdef HAVE_SYS_TYPES_H
32 # include <sys/types.h>
41 static int proto_h1 = -1;
42 static int hf_h1_header = -1;
43 static int hf_h1_len = -1;
44 static int hf_h1_opfield = -1;
45 static int hf_h1_oplen = -1;
46 static int hf_h1_opcode = -1;
47 static int hf_h1_requestblock = -1;
48 static int hf_h1_requestlen = -1;
49 static int hf_h1_dbnr = -1;
50 static int hf_h1_dwnr = -1;
51 static int hf_h1_dlen = -1;
52 static int hf_h1_org = -1;
53 static int hf_h1_response = -1;
54 static int hf_h1_response_len = -1;
55 static int hf_h1_response_value = -1;
56 static int hf_h1_empty_len = -1;
57 static int hf_h1_empty = -1;
59 #define EMPTY_BLOCK 0xFF
60 #define OPCODE_BLOCK 0x01
61 #define REQUEST_BLOCK 0x03
62 #define RESPONSE_BLOCK 0x0F
64 static const value_string opcode_vals[] = {
66 {4, "Write Response"},
72 static const value_string org_vals[] = {
88 static const value_string returncode_vals[] = {
90 {0x02, "Requested block does not exist"},
91 {0x03, "Requested block too small"},
92 {0xFF, "Error, reason unknown"},
96 static gint ett_h1 = -1;
97 static gint ett_opcode = -1;
98 static gint ett_org = -1;
99 static gint ett_response = -1;
100 static gint ett_empty = -1;
102 static gboolean dissect_h1(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree)
106 proto_tree *h1_tree = NULL;
109 proto_tree *opcode_tree = NULL;
110 proto_tree *org_tree = NULL;
111 proto_tree *response_tree = NULL;
112 proto_tree *empty_tree = NULL;
114 unsigned int position = 3;
115 unsigned int offset=0;
117 if (tvb_length_remaining(tvb, 0) < 2)
119 /* Not enough data captured to hold the "S5" header; don't try
120 to interpret it as H1. */
124 if (!(tvb_get_guint8(tvb,offset) == 'S' && tvb_get_guint8(tvb,offset+1) == '5'))
129 if (check_col (pinfo->fd, COL_PROTOCOL))
130 col_set_str (pinfo->fd, COL_PROTOCOL, "H1");
131 if (check_col (pinfo->fd, COL_INFO))
132 col_add_str (pinfo->fd, COL_INFO, "S5: ");
135 ti = proto_tree_add_item (tree, proto_h1, tvb, offset, 16, FALSE);
136 h1_tree = proto_item_add_subtree (ti, ett_h1);
137 proto_tree_add_uint (h1_tree, hf_h1_header, tvb, offset, 2,
138 tvb_get_ntohs(tvb,offset));
139 proto_tree_add_uint (h1_tree, hf_h1_len, tvb, offset + 2, 1,
140 tvb_get_guint8(tvb,offset+2));
143 while (position < tvb_get_guint8(tvb,offset+2))
145 switch (tvb_get_guint8(tvb,offset + position))
150 ti = proto_tree_add_uint (h1_tree, hf_h1_opfield, tvb,
152 tvb_get_guint8(tvb,offset+position+1),
153 tvb_get_guint8(tvb,offset+position));
154 opcode_tree = proto_item_add_subtree (ti, ett_opcode);
155 proto_tree_add_uint (opcode_tree, hf_h1_oplen, tvb,
156 offset + position + 1, 1,
157 tvb_get_guint8(tvb,offset + position + 1));
158 proto_tree_add_uint (opcode_tree, hf_h1_opcode, tvb,
159 offset + position + 2, 1,
160 tvb_get_guint8(tvb,offset + position + 2));
162 if (check_col (pinfo->fd, COL_INFO))
164 col_append_str (pinfo->fd, COL_INFO,
165 val_to_str (tvb_get_guint8(tvb,offset + position + 2),
166 opcode_vals,"Unknown Opcode (0x%2.2x)"));
172 ti = proto_tree_add_uint (h1_tree, hf_h1_requestblock, tvb,
174 tvb_get_guint8(tvb,offset + position + 1),
175 tvb_get_guint8(tvb,offset + position));
176 org_tree = proto_item_add_subtree (ti, ett_org);
177 proto_tree_add_uint (org_tree, hf_h1_requestlen, tvb,
178 offset + position + 1, 1,
179 tvb_get_guint8(tvb,offset + position+1));
180 proto_tree_add_uint (org_tree, hf_h1_org, tvb,
181 offset + position + 2, 1,
182 tvb_get_guint8(tvb,offset + position+2));
183 proto_tree_add_uint (org_tree, hf_h1_dbnr, tvb,
184 offset + position + 3, 1,
185 tvb_get_guint8(tvb,offset + position+3));
186 proto_tree_add_uint (org_tree, hf_h1_dwnr, tvb,
187 offset + position + 4, 2,
188 tvb_get_ntohs(tvb,offset+position+4));
189 proto_tree_add_int (org_tree, hf_h1_dlen, tvb,
190 offset + position + 6, 2,
191 tvb_get_ntohs(tvb,offset+position+6));
193 if (check_col (pinfo->fd, COL_INFO))
195 col_append_fstr (pinfo->fd, COL_INFO, " %s %d",
196 val_to_str (tvb_get_guint8(tvb,offset + position + 2),
197 org_vals,"Unknown Type (0x%2.2x)"),
198 tvb_get_guint8(tvb,offset + position + 3));
199 col_append_fstr (pinfo->fd, COL_INFO, " DW %d",
200 tvb_get_ntohs(tvb,offset+position+4));
201 col_append_fstr (pinfo->fd, COL_INFO, " Count %d",
202 tvb_get_ntohs(tvb,offset+position+6));
208 ti = proto_tree_add_uint (h1_tree, hf_h1_response, tvb,
210 tvb_get_guint8(tvb,offset + position + 1),
211 tvb_get_guint8(tvb,offset + position));
212 response_tree = proto_item_add_subtree (ti, ett_response);
213 proto_tree_add_uint (response_tree, hf_h1_response_len, tvb,
214 offset + position + 1, 1,
215 tvb_get_guint8(tvb,offset + position+1));
216 proto_tree_add_uint (response_tree, hf_h1_response_value, tvb,
217 offset + position + 2, 1,
218 tvb_get_guint8(tvb,offset + position+2));
220 if (check_col (pinfo->fd, COL_INFO))
222 col_append_fstr (pinfo->fd, COL_INFO, " %s",
223 val_to_str (tvb_get_guint8(tvb,offset + position + 2),
224 returncode_vals,"Unknown Returcode (0x%2.2x"));
230 ti = proto_tree_add_uint (h1_tree, hf_h1_empty, tvb,
232 tvb_get_guint8(tvb,offset + position + 1),
233 tvb_get_guint8(tvb,offset + position));
234 empty_tree = proto_item_add_subtree (ti, ett_empty);
236 proto_tree_add_uint (empty_tree, hf_h1_empty_len, tvb,
237 offset + position + 1, 1,
238 tvb_get_guint8(tvb,offset + position+1));
242 /* This is not a valid telegram. So cancel dissection
243 and try the next dissector */
247 position += tvb_get_guint8(tvb,offset + position + 1); /* Goto next section */
249 next_tvb = tvb_new_subset(tvb, offset+tvb_get_guint8(tvb,offset+2), -1, -1);
250 dissect_data(next_tvb, 0, pinfo, tree);
257 proto_register_h1 (void)
259 static hf_register_info hf[] = {
261 {"H1-Header", "h1.header", FT_UINT16, BASE_HEX, NULL, 0x0,
264 {"Length indicator", "h1.len", FT_UINT16, BASE_DEC, NULL, 0x0,
267 {"Operation identifier", "h1.opfield", FT_UINT8, BASE_HEX, NULL, 0x0,
270 {"Operation length", "h1.oplen", FT_UINT8, BASE_HEX, NULL, 0x0, ""}},
272 {"Opcode", "h1.opcode", FT_UINT8, BASE_HEX, VALS (opcode_vals), 0x0,
274 {&hf_h1_requestblock,
275 {"Request identifier", "h1.request", FT_UINT8, BASE_HEX, NULL, 0x0,
278 {"Request length", "h1.reqlen", FT_UINT8, BASE_HEX, NULL, 0x0,
281 {"Memory type", "h1.org", FT_UINT8, BASE_HEX, VALS (org_vals), 0x0,
284 {"Memory block number", "h1.dbnr", FT_UINT8, BASE_DEC, NULL, 0x0, ""}},
286 {"Address within memory block", "h1.dwnr", FT_UINT16, BASE_DEC, NULL, 0x0,
289 {"Length in words", "h1.dlen", FT_INT16, BASE_DEC, NULL, 0x0, ""}},
291 {"Response identifier", "h1.response", FT_UINT8, BASE_HEX, NULL, 0x0, ""}},
292 {&hf_h1_response_len,
293 {"Response length", "h1.reslen", FT_UINT8, BASE_DEC, NULL, 0x0,
295 {&hf_h1_response_value,
296 {"Response value", "h1.resvalue", FT_UINT8, BASE_DEC,
297 VALS (returncode_vals), 0x0, ""}},
299 {"Empty field", "h1.empty", FT_UINT8, BASE_HEX, NULL, 0x0,
302 {"Empty field length", "h1.empty_len", FT_UINT8, BASE_DEC, NULL, 0x0,
306 static gint *ett[] = {
314 proto_h1 = proto_register_protocol ("Sinec H1 Protocol", "H1", "h1");
315 proto_register_field_array (proto_h1, hf, array_length (hf));
316 proto_register_subtree_array (ett, array_length (ett));
320 proto_reg_handoff_h1(void)
322 heur_dissector_add("cotp_is", dissect_h1, proto_h1);