2 * ISC OMAPI (Object Management API) dissector
3 * Copyright 2006, Jaap Keuter <jaap.keuter@xs4all.nl>
7 * Wireshark - Network traffic analyzer
8 * By Gerald Combs <gerald@wireshark.org>
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., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
27 * From the description api+protocol.
28 * All fields are 32 bit unless stated otherwise.
30 * On startup, each side sends a status message indicating what version
31 * of the protocol they are speaking. The status message looks like this:
32 * +---------+---------+
33 * | version | hlength |
34 * +---------+---------+
36 * The fixed-length header consists of:
37 * +--------+----+--------+----+-----+---------+------------+------------+-----+
38 * | authid | op | handle | id | rid | authlen | msg values | obj values | sig |
39 * +--------+----+--------+----+-----+---------+------v-----+-----v------+--v--+
40 * NOTE: real life capture shows order to be: authid, authlen, opcode, handle...
42 * The message and object values consists of:
43 * +---------+------+----------+-------+
44 * | namelen | name | valuelen | value |
45 * +---16b---+--v---+----------+---v---+
52 #include <epan/packet.h>
53 #include <epan/ptvcursor.h>
55 static int proto_omapi = -1;
56 static int hf_omapi_version = -1;
57 static int hf_omapi_hlength = -1;
58 static int hf_omapi_auth_id = -1;
59 static int hf_omapi_auth_len = -1;
60 static int hf_omapi_opcode = -1;
61 static int hf_omapi_handle = -1;
62 static int hf_omapi_id = -1;
63 static int hf_omapi_rid = -1;
64 static int hf_omapi_msg_name_len = -1; /* 16bit */
65 static int hf_omapi_msg_name = -1;
66 static int hf_omapi_msg_value_len = -1;
67 static int hf_omapi_msg_value = -1;
68 static int hf_omapi_obj_name_len = -1; /* 16bit */
69 static int hf_omapi_obj_name = -1;
70 static int hf_omapi_obj_value_len = -1;
71 static int hf_omapi_obj_value = -1;
72 static int hf_omapi_signature = -1;
74 static gint ett_omapi = -1;
76 #define OMAPI_PORT 7911
84 #define OP_NOTIFY_CANCEL 7
85 #define OP_NOTIFY_CANCELLED 8
87 static const value_string omapi_opcode_vals[] = {
89 { OP_REFRESH, "Refresh" },
90 { OP_UPDATE, "Update" },
91 { OP_NOTIFY, "Notify" },
92 { OP_ERROR, "Error" },
93 { OP_DELETE, "Delete" },
94 { OP_NOTIFY_CANCEL, "Notify cancel" },
95 { OP_NOTIFY_CANCELLED,"Notify cancelled" },
100 dissect_omapi(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree)
103 proto_tree *omapi_tree;
111 col_set_str(pinfo->cinfo, COL_PROTOCOL, "OMAPI");
113 col_clear(pinfo->cinfo, COL_INFO);
115 ti = proto_tree_add_item(tree, proto_omapi, tvb, 0, -1, FALSE);
116 omapi_tree = proto_item_add_subtree(ti, ett_omapi);
117 cursor = ptvcursor_new(omapi_tree, tvb, 0);
119 if (tvb_reported_length_remaining(tvb, 0) < 8)
121 /* Payload too small for OMAPI */
122 DISSECTOR_ASSERT_NOT_REACHED();
124 else if (tvb_reported_length_remaining(tvb, 0) < 24)
126 /* This is a startup message */
127 ptvcursor_add(cursor, hf_omapi_version, 4, FALSE);
128 ptvcursor_add(cursor, hf_omapi_hlength, 4, FALSE);
130 col_set_str(pinfo->cinfo, COL_INFO, "Status message");
131 proto_item_append_text(ti, ", Status message");
135 else if ( !(tvb_get_ntohl(tvb, 8) || tvb_get_ntohl(tvb, 12)) )
137 /* This is a startup message, and more */
138 ptvcursor_add(cursor, hf_omapi_version, 4, FALSE);
139 ptvcursor_add(cursor, hf_omapi_hlength, 4, FALSE);
141 if (check_col(pinfo->cinfo, COL_INFO))
143 col_append_str(pinfo->cinfo, COL_INFO, "Status message");
145 proto_item_append_text(ti, ", Status message");
148 ptvcursor_add(cursor, hf_omapi_auth_id, 4, FALSE);
149 authlength = tvb_get_ntohl(tvb, ptvcursor_current_offset(cursor));
150 ptvcursor_add(cursor, hf_omapi_auth_len, 4, FALSE);
152 if (check_col(pinfo->cinfo, COL_INFO))
154 col_append_sep_str(pinfo->cinfo, COL_INFO, NULL,
155 val_to_str(tvb_get_ntohl(tvb, ptvcursor_current_offset(cursor)), omapi_opcode_vals, "Unknown opcode (0x%04x)"));
157 proto_item_append_text(ti, ", Opcode: %s",
158 val_to_str(tvb_get_ntohl(tvb, ptvcursor_current_offset(cursor)), omapi_opcode_vals, "Unknown opcode (0x%04x)"));
160 ptvcursor_add(cursor, hf_omapi_opcode, 4, FALSE);
161 ptvcursor_add(cursor, hf_omapi_handle, 4, FALSE);
162 ptvcursor_add(cursor, hf_omapi_id, 4, FALSE);
163 ptvcursor_add(cursor, hf_omapi_rid, 4, FALSE);
165 msglength = tvb_get_ntohs(tvb, ptvcursor_current_offset(cursor));
168 ptvcursor_add(cursor, hf_omapi_msg_name_len, 2, FALSE);
169 ptvcursor_add(cursor, hf_omapi_msg_name, msglength, FALSE);
170 msglength = tvb_get_ntohl(tvb, ptvcursor_current_offset(cursor));
171 ptvcursor_add(cursor, hf_omapi_msg_value_len, 4, FALSE);
175 proto_tree_add_text(omapi_tree, tvb, 0, 0, "Empty string");
177 else if (msglength == (guint32)~0)
179 proto_tree_add_text(omapi_tree, tvb, 0, 0, "No value");
183 ptvcursor_add(cursor, hf_omapi_msg_value, msglength, FALSE);
186 msglength = tvb_get_ntohs(tvb, ptvcursor_current_offset(cursor));
189 proto_tree_add_text(omapi_tree, tvb, ptvcursor_current_offset(cursor), 2, "Message end tag");
190 ptvcursor_advance(cursor, 2);
192 objlength = tvb_get_ntohs(tvb, ptvcursor_current_offset(cursor));
195 ptvcursor_add(cursor, hf_omapi_obj_name_len, 2, FALSE);
196 ptvcursor_add(cursor, hf_omapi_obj_name, objlength, FALSE);
197 objlength = tvb_get_ntohl(tvb, ptvcursor_current_offset(cursor));
198 ptvcursor_add(cursor, hf_omapi_obj_value_len, 4, FALSE);
202 proto_tree_add_text(omapi_tree, tvb, 0, 0, "Empty string");
204 else if (objlength == (guint32)~0)
206 proto_tree_add_text(omapi_tree, tvb, 0, 0, "No value");
210 ptvcursor_add(cursor, hf_omapi_obj_value, objlength, FALSE);
213 objlength = tvb_get_ntohs(tvb, ptvcursor_current_offset(cursor));
216 proto_tree_add_text(omapi_tree, tvb, ptvcursor_current_offset(cursor), 2, "Object end tag");
217 ptvcursor_advance(cursor, 2);
219 if (authlength > 0) {
220 ptvcursor_add(cursor, hf_omapi_signature, authlength, FALSE);
225 proto_register_omapi(void)
227 static hf_register_info hf[] = {
229 { "Version", "omapi.version",
230 FT_UINT32, BASE_DEC, NULL, 0x0,
233 { "Header length", "omapi.hlength",
234 FT_UINT32, BASE_DEC, NULL, 0x0,
237 { "Authentication ID", "omapi.authid",
238 FT_UINT32, BASE_DEC, NULL, 0x0,
240 { &hf_omapi_auth_len,
241 { "Authentication length", "omapi.authlength",
242 FT_UINT32, BASE_DEC, NULL, 0x0,
245 { "Opcode", "omapi.opcode",
246 FT_UINT32, BASE_DEC, VALS(omapi_opcode_vals), 0x0,
249 { "Handle", "omapi.handle",
250 FT_UINT32, BASE_DEC, NULL, 0x0,
254 FT_UINT32, BASE_DEC, NULL, 0x0,
257 { "Response ID", "omapi.rid",
258 FT_UINT32, BASE_DEC, NULL, 0x0,
260 { &hf_omapi_msg_name_len,
261 { "Message name length", "omapi.msg_name_length",
262 FT_UINT16, BASE_DEC, NULL, 0x0,
264 { &hf_omapi_msg_name,
265 { "Message name", "omapi.msg_name",
266 FT_STRING, BASE_NONE, NULL, 0x0,
268 { &hf_omapi_msg_value_len,
269 { "Message value length", "omapi.msg_value_length",
270 FT_UINT32, BASE_DEC, NULL, 0x0,
272 { &hf_omapi_msg_value,
273 { "Message value", "omapi.msg_value",
274 FT_STRING, BASE_NONE, NULL, 0x0,
276 { &hf_omapi_obj_name_len,
277 { "Object name length", "omapi.obj_name_length",
278 FT_UINT16, BASE_DEC, NULL, 0x0,
280 { &hf_omapi_obj_name,
281 { "Object name", "omapi.obj_name",
282 FT_STRING, BASE_NONE, NULL, 0x0,
284 { &hf_omapi_obj_value_len,
285 { "Object value length", "omapi.object_value_length",
286 FT_UINT32, BASE_DEC, NULL, 0x0,
288 { &hf_omapi_obj_value,
289 { "Object value", "omapi.obj_value",
290 FT_BYTES, BASE_NONE, NULL, 0x0,
292 { &hf_omapi_signature,
293 { "Signature", "omapi.signature",
294 FT_BYTES, BASE_NONE, NULL, 0x0,
298 static gint *ett[] = {
302 proto_omapi = proto_register_protocol("ISC Object Management API", "OMAPI", "omapi");
303 proto_register_field_array(proto_omapi, hf, array_length(hf));
304 proto_register_subtree_array(ett, array_length(ett));
308 proto_reg_handoff_omapi(void)
310 dissector_handle_t omapi_handle;
312 omapi_handle = create_dissector_handle(dissect_omapi, proto_omapi);
313 dissector_add_uint("tcp.port", OMAPI_PORT, omapi_handle);