2 * Routines for Sinec H1 packet disassembly
3 * Gerrit Gehnen <G.Gehnen@atrie.de>
5 * $Id: packet-h1.c,v 1.19 2001/06/08 08:35:15 guy Exp $
7 * Ethereal - Network traffic analyzer
8 * By Gerald Combs <gerald@ethereal.com>
9 * Copyright 1998 Gerald Combs
11 * This program is free software; you can redistribute it and/or
12 * modify it under the terms of the GNU General Public License
13 * as published by the Free Software Foundation; either version 2
14 * of the License, or (at your option) any later version.
16 * This program is distributed in the hope that it will be useful,
17 * but WITHOUT ANY WARRANTY; without even the implied warranty of
18 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
19 * GNU General Public License for more details.
21 * You should have received a copy of the GNU General Public License
22 * along with this program; if not, write to the Free Software
23 * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
30 #ifdef HAVE_SYS_TYPES_H
31 # include <sys/types.h>
39 static int proto_h1 = -1;
40 static int hf_h1_header = -1;
41 static int hf_h1_len = -1;
42 static int hf_h1_opfield = -1;
43 static int hf_h1_oplen = -1;
44 static int hf_h1_opcode = -1;
45 static int hf_h1_requestblock = -1;
46 static int hf_h1_requestlen = -1;
47 static int hf_h1_dbnr = -1;
48 static int hf_h1_dwnr = -1;
49 static int hf_h1_dlen = -1;
50 static int hf_h1_org = -1;
51 static int hf_h1_response = -1;
52 static int hf_h1_response_len = -1;
53 static int hf_h1_response_value = -1;
54 static int hf_h1_empty_len = -1;
55 static int hf_h1_empty = -1;
57 #define EMPTY_BLOCK 0xFF
58 #define OPCODE_BLOCK 0x01
59 #define REQUEST_BLOCK 0x03
60 #define RESPONSE_BLOCK 0x0F
62 static const value_string opcode_vals[] = {
64 {4, "Write Response"},
70 static const value_string org_vals[] = {
86 static const value_string returncode_vals[] = {
88 {0x02, "Requested block does not exist"},
89 {0x03, "Requested block too small"},
90 {0xFF, "Error, reason unknown"},
94 static gint ett_h1 = -1;
95 static gint ett_opcode = -1;
96 static gint ett_org = -1;
97 static gint ett_response = -1;
98 static gint ett_empty = -1;
100 static gboolean dissect_h1(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree)
104 proto_tree *h1_tree = NULL;
107 proto_tree *opcode_tree = NULL;
108 proto_tree *org_tree = NULL;
109 proto_tree *response_tree = NULL;
110 proto_tree *empty_tree = NULL;
112 unsigned int position = 3;
113 unsigned int offset=0;
115 if (tvb_length_remaining(tvb, 0) < 2)
117 /* Not enough data captured to hold the "S5" header; don't try
118 to interpret it as H1. */
122 if (!(tvb_get_guint8(tvb,offset) == 'S' && tvb_get_guint8(tvb,offset+1) == '5'))
127 if (check_col (pinfo->fd, COL_PROTOCOL))
128 col_set_str (pinfo->fd, COL_PROTOCOL, "H1");
129 if (check_col (pinfo->fd, COL_INFO))
130 col_add_str (pinfo->fd, COL_INFO, "S5: ");
133 ti = proto_tree_add_item (tree, proto_h1, tvb, offset, 16, FALSE);
134 h1_tree = proto_item_add_subtree (ti, ett_h1);
135 proto_tree_add_uint (h1_tree, hf_h1_header, tvb, offset, 2,
136 tvb_get_ntohs(tvb,offset));
137 proto_tree_add_uint (h1_tree, hf_h1_len, tvb, offset + 2, 1,
138 tvb_get_guint8(tvb,offset+2));
141 while (position < tvb_get_guint8(tvb,offset+2))
143 switch (tvb_get_guint8(tvb,offset + position))
148 ti = proto_tree_add_uint (h1_tree, hf_h1_opfield, tvb,
150 tvb_get_guint8(tvb,offset+position+1),
151 tvb_get_guint8(tvb,offset+position));
152 opcode_tree = proto_item_add_subtree (ti, ett_opcode);
153 proto_tree_add_uint (opcode_tree, hf_h1_oplen, tvb,
154 offset + position + 1, 1,
155 tvb_get_guint8(tvb,offset + position + 1));
156 proto_tree_add_uint (opcode_tree, hf_h1_opcode, tvb,
157 offset + position + 2, 1,
158 tvb_get_guint8(tvb,offset + position + 2));
160 if (check_col (pinfo->fd, COL_INFO))
162 col_append_str (pinfo->fd, COL_INFO,
163 val_to_str (tvb_get_guint8(tvb,offset + position + 2),
164 opcode_vals,"Unknown Opcode (0x%2.2x)"));
170 ti = proto_tree_add_uint (h1_tree, hf_h1_requestblock, tvb,
172 tvb_get_guint8(tvb,offset + position + 1),
173 tvb_get_guint8(tvb,offset + position));
174 org_tree = proto_item_add_subtree (ti, ett_org);
175 proto_tree_add_uint (org_tree, hf_h1_requestlen, tvb,
176 offset + position + 1, 1,
177 tvb_get_guint8(tvb,offset + position+1));
178 proto_tree_add_uint (org_tree, hf_h1_org, tvb,
179 offset + position + 2, 1,
180 tvb_get_guint8(tvb,offset + position+2));
181 proto_tree_add_uint (org_tree, hf_h1_dbnr, tvb,
182 offset + position + 3, 1,
183 tvb_get_guint8(tvb,offset + position+3));
184 proto_tree_add_uint (org_tree, hf_h1_dwnr, tvb,
185 offset + position + 4, 2,
186 tvb_get_ntohs(tvb,offset+position+4));
187 proto_tree_add_int (org_tree, hf_h1_dlen, tvb,
188 offset + position + 6, 2,
189 tvb_get_ntohs(tvb,offset+position+6));
191 if (check_col (pinfo->fd, COL_INFO))
193 col_append_fstr (pinfo->fd, COL_INFO, " %s %d",
194 val_to_str (tvb_get_guint8(tvb,offset + position + 2),
195 org_vals,"Unknown Type (0x%2.2x)"),
196 tvb_get_guint8(tvb,offset + position + 3));
197 col_append_fstr (pinfo->fd, COL_INFO, " DW %d",
198 tvb_get_ntohs(tvb,offset+position+4));
199 col_append_fstr (pinfo->fd, COL_INFO, " Count %d",
200 tvb_get_ntohs(tvb,offset+position+6));
206 ti = proto_tree_add_uint (h1_tree, hf_h1_response, tvb,
208 tvb_get_guint8(tvb,offset + position + 1),
209 tvb_get_guint8(tvb,offset + position));
210 response_tree = proto_item_add_subtree (ti, ett_response);
211 proto_tree_add_uint (response_tree, hf_h1_response_len, tvb,
212 offset + position + 1, 1,
213 tvb_get_guint8(tvb,offset + position+1));
214 proto_tree_add_uint (response_tree, hf_h1_response_value, tvb,
215 offset + position + 2, 1,
216 tvb_get_guint8(tvb,offset + position+2));
218 if (check_col (pinfo->fd, COL_INFO))
220 col_append_fstr (pinfo->fd, COL_INFO, " %s",
221 val_to_str (tvb_get_guint8(tvb,offset + position + 2),
222 returncode_vals,"Unknown Returcode (0x%2.2x"));
228 ti = proto_tree_add_uint (h1_tree, hf_h1_empty, tvb,
230 tvb_get_guint8(tvb,offset + position + 1),
231 tvb_get_guint8(tvb,offset + position));
232 empty_tree = proto_item_add_subtree (ti, ett_empty);
234 proto_tree_add_uint (empty_tree, hf_h1_empty_len, tvb,
235 offset + position + 1, 1,
236 tvb_get_guint8(tvb,offset + position+1));
240 /* This is not a valid telegram. So cancel dissection
241 and try the next dissector */
245 position += tvb_get_guint8(tvb,offset + position + 1); /* Goto next section */
247 next_tvb = tvb_new_subset(tvb, offset+tvb_get_guint8(tvb,offset+2), -1, -1);
248 dissect_data(next_tvb, 0, pinfo, tree);
255 proto_register_h1 (void)
257 static hf_register_info hf[] = {
259 {"H1-Header", "h1.header", FT_UINT16, BASE_HEX, NULL, 0x0,
262 {"Length indicator", "h1.len", FT_UINT16, BASE_DEC, NULL, 0x0,
265 {"Operation identifier", "h1.opfield", FT_UINT8, BASE_HEX, NULL, 0x0,
268 {"Operation length", "h1.oplen", FT_UINT8, BASE_HEX, NULL, 0x0, ""}},
270 {"Opcode", "h1.opcode", FT_UINT8, BASE_HEX, VALS (opcode_vals), 0x0,
272 {&hf_h1_requestblock,
273 {"Request identifier", "h1.request", FT_UINT8, BASE_HEX, NULL, 0x0,
276 {"Request length", "h1.reqlen", FT_UINT8, BASE_HEX, NULL, 0x0,
279 {"Memory type", "h1.org", FT_UINT8, BASE_HEX, VALS (org_vals), 0x0,
282 {"Memory block number", "h1.dbnr", FT_UINT8, BASE_DEC, NULL, 0x0, ""}},
284 {"Address within memory block", "h1.dwnr", FT_UINT16, BASE_DEC, NULL, 0x0,
287 {"Length in words", "h1.dlen", FT_INT16, BASE_DEC, NULL, 0x0, ""}},
289 {"Response identifier", "h1.response", FT_UINT8, BASE_HEX, NULL, 0x0, ""}},
290 {&hf_h1_response_len,
291 {"Response length", "h1.reslen", FT_UINT8, BASE_DEC, NULL, 0x0,
293 {&hf_h1_response_value,
294 {"Response value", "h1.resvalue", FT_UINT8, BASE_DEC,
295 VALS (returncode_vals), 0x0, ""}},
297 {"Empty field", "h1.empty", FT_UINT8, BASE_HEX, NULL, 0x0,
300 {"Empty field length", "h1.empty_len", FT_UINT8, BASE_DEC, NULL, 0x0,
304 static gint *ett[] = {
312 proto_h1 = proto_register_protocol ("Sinec H1 Protocol", "H1", "h1");
313 proto_register_field_array (proto_h1, hf, array_length (hf));
314 proto_register_subtree_array (ett, array_length (ett));
318 proto_reg_handoff_h1(void)
320 heur_dissector_add("cotp_is", dissect_h1, proto_h1);