From metatech:
- Reassembly of MQ messages spanning several PDU - RESET message svn path=/trunk/; revision=10854
This commit is contained in:
parent
6eaf4ec1f2
commit
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207
packet-mq.c
207
packet-mq.c
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@ -3,7 +3,7 @@
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*
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* metatech <metatech@flashmail.com>
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*
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* $Id: packet-mq.c,v 1.5 2004/05/01 21:18:09 guy Exp $
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* $Id: packet-mq.c,v 1.6 2004/05/11 11:27:20 guy Exp $
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*
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* Ethereal - Network traffic analyzer
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* By Gerald Combs <gerald@ethereal.com>
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@ -62,7 +62,6 @@
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* - Find the semantics of the unknown fields
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* - Display EBCDIC strings as ASCII
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* - Packets which structures built on different platforms
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* - Reassembly of MQ segments
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*/
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#ifdef HAVE_CONFIG_H
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@ -72,6 +71,7 @@
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#include <glib.h>
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#include <epan/packet.h>
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#include <epan/conversation.h>
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#include "reassemble.h"
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#include "prefs.h"
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#include "packet-tcp.h"
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#include "packet-mq.h"
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@ -184,8 +184,11 @@ static int hf_mq_put_length = -1;
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static int hf_mq_open_options = -1;
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static int hf_mq_ping_length = -1;
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static int hf_mq_ping_buffer = -1;
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static int hf_mq_reset_length = -1;
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static int hf_mq_reset_seqnum = -1;
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static int hf_mq_status_length = -1;
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static int hf_mq_status_code = -1;
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static int hf_mq_status_value = -1;
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static int hf_mq_od_structid = -1;
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static int hf_mq_od_version = -1;
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static int hf_mq_od_objecttype = -1;
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@ -336,6 +339,7 @@ static gint ett_mq_spi_options = -1;
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static gint ett_mq_put = -1;
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static gint ett_mq_open = -1;
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static gint ett_mq_ping = -1;
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static gint ett_mq_reset = -1;
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static gint ett_mq_status = -1;
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static gint ett_mq_od = -1;
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static gint ett_mq_or = -1;
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@ -360,6 +364,11 @@ static dissector_handle_t data_handle;
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static heur_dissector_list_t mq_heur_subdissector_list;
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static gboolean mq_desegment = TRUE;
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static gboolean mq_reassembly = FALSE;
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static GHashTable *mq_fragment_table = NULL;
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static GHashTable *mq_reassembled_table = NULL;
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#define MQ_PORT_TCP 1414
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#define MQ_SOCKET_SPX 0x5E86
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@ -555,7 +564,6 @@ static gboolean mq_desegment = TRUE;
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#define MQ_XA_RBPROTO 105
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#define MQ_XA_RBTIMEOUT 106
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#define MQ_XA_RBTRANSIENT 107
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#define MQ_XA_RBEND 107
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#define MQ_XA_NOMIGRATE 9
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#define MQ_XA_HEURHAZ 8
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#define MQ_XA_HEURCOM 7
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@ -603,6 +611,7 @@ static gboolean mq_desegment = TRUE;
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#define MQ_TEXT_PUT "MQPUT/MQGET"
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#define MQ_TEXT_OPEN "MQOPEN/MQCLOSE"
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#define MQ_TEXT_PING "PING"
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#define MQ_TEXT_RESET "RESET"
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#define MQ_TEXT_STAT "STATUS"
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#define MQ_TEXT_SPI "SPI"
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#define MQ_TEXT_XA "XA"
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@ -729,7 +738,6 @@ static const value_string mq_xaer_vals[] = {
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{ MQ_XA_RBPROTO, "XA_RBPROTO" },
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{ MQ_XA_RBTIMEOUT, "XA_RBTIMEOUT" },
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{ MQ_XA_RBTRANSIENT, "XA_RBTRANSIENT" },
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{ MQ_XA_RBEND, "XA_RBEND" },
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{ MQ_XA_NOMIGRATE, "XA_NOMIGRATE" },
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{ MQ_XA_HEURHAZ, "XA_HEURHAZ" },
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{ MQ_XA_HEURCOM, "XA_HEURCOM" },
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@ -838,7 +846,6 @@ static gint
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dissect_mq_md(tvbuff_t *tvb, proto_tree *tree, gboolean bLittleEndian, gint offset, struct mq_msg_properties* tMsgProps)
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{
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proto_tree *mq_tree = NULL;
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proto_item *ti = NULL;
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guint32 structId;
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gint iSizeMD = 0;
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@ -863,6 +870,7 @@ dissect_mq_md(tvbuff_t *tvb, proto_tree *tree, gboolean bLittleEndian, gint offs
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tMsgProps->iOffsetFormat = offset + 32;
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if (tree)
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{
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proto_item *ti = NULL;
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ti = proto_tree_add_text(tree, tvb, offset, iSizeMD, MQ_TEXT_MD);
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mq_tree = proto_item_add_subtree(ti, ett_mq_md);
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@ -1363,22 +1371,30 @@ dissect_mq_pdu(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree)
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{
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/* Some status are 28 bytes long and some are 36 bytes long */
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guint32 iStatus = 0;
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gint iStatusLength = 0;
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iStatus = tvb_get_guint32_endian(tvb, offset + 4, bLittleEndian);
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iStatusLength = tvb_get_guint32_endian(tvb, offset, bLittleEndian);
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if (check_col(pinfo->cinfo, COL_INFO))
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if (tvb_length_remaining(tvb, offset) >= iStatusLength)
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{
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if (iStatus != 0)
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col_append_fstr(pinfo->cinfo, COL_INFO, ": Code=%s", val_to_str(iStatus, mq_status_vals, "Unknown (0x%08x)"));
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if (check_col(pinfo->cinfo, COL_INFO))
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{
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if (iStatus != 0)
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col_append_fstr(pinfo->cinfo, COL_INFO, ": Code=%s", val_to_str(iStatus, mq_status_vals, "Unknown (0x%08x)"));
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}
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if (tree)
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{
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ti = proto_tree_add_text(mqroot_tree, tvb, offset, 8, MQ_TEXT_STAT);
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mq_tree = proto_item_add_subtree(ti, ett_mq_status);
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proto_tree_add_item(mq_tree, hf_mq_status_length, tvb, offset, 4, bLittleEndian);
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proto_tree_add_item(mq_tree, hf_mq_status_code, tvb, offset + 4, 4, bLittleEndian);
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if (iStatusLength >= 12)
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proto_tree_add_item(mq_tree, hf_mq_status_value, tvb, offset + 8, 4, bLittleEndian);
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}
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offset += iStatusLength;
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}
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if (tree)
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{
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ti = proto_tree_add_text(mqroot_tree, tvb, offset, 8, MQ_TEXT_STAT);
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mq_tree = proto_item_add_subtree(ti, ett_mq_status);
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proto_tree_add_item(mq_tree, hf_mq_status_length, tvb, offset, 4, bLittleEndian);
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proto_tree_add_item(mq_tree, hf_mq_status_code, tvb, offset + 4, 4, bLittleEndian);
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}
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offset += 8;
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}
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else if (opcode == MQ_TST_PING && tvb_length_remaining(tvb, offset) > 4)
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{
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}
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offset = tvb_length(tvb);
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}
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else if (opcode == MQ_TST_RESET && tvb_length_remaining(tvb, offset) >= 8)
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{
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if (tree)
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{
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ti = proto_tree_add_text(mqroot_tree, tvb, offset, -1, MQ_TEXT_RESET);
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mq_tree = proto_item_add_subtree(ti, ett_mq_reset);
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proto_tree_add_item(mq_tree, hf_mq_reset_length, tvb, offset, 4, bLittleEndian);
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proto_tree_add_item(mq_tree, hf_mq_reset_seqnum, tvb, offset + 4, 4, bLittleEndian);
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}
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offset = tvb_length(tvb);
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}
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else if (opcode == MQ_TST_MQCONN && tvb_length_remaining(tvb, offset) > 0)
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{
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gint iSizeCONN = 0;
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@ -2238,6 +2266,7 @@ dissect_mq_pdu(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree)
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/* Call subdissector for the payload */
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tvbuff_t* next_tvb = NULL;
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struct mqinfo mqinfo;
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/* Format, encoding and character set are "data type" information, not subprotocol information */
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mqinfo.encoding = tvb_get_guint32_endian(tvb, tMsgProps.iOffsetEncoding, bLittleEndian);
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mqinfo.ccsid = tvb_get_guint32_endian(tvb, tMsgProps.iOffsetCcsid, bLittleEndian);
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tvb_memcpy(tvb, mqinfo.format, tMsgProps.iOffsetFormat, 8);
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@ -2261,8 +2290,8 @@ dissect_mq_pdu(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree)
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}
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else
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{
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/* This is a MQ segment continuation (no PDU reassembly is done) */
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if (check_col(pinfo->cinfo, COL_INFO)) col_append_str(pinfo->cinfo, COL_INFO, " [Segment Continuation]");
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/* This is a MQ segment continuation (if MQ reassembly is not enabled) */
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if (check_col(pinfo->cinfo, COL_INFO)) col_append_str(pinfo->cinfo, COL_INFO, " [Unreassembled MQ]");
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call_dissector(data_handle, tvb_new_subset(tvb, offset, -1, -1), pinfo, tree);
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}
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}
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@ -2270,7 +2299,7 @@ dissect_mq_pdu(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree)
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else
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{
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/* This packet is a TCP continuation of a segment (if desegmentation is not enabled) */
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if (check_col(pinfo->cinfo, COL_INFO)) col_append_str(pinfo->cinfo, COL_INFO, "Continuation");
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if (check_col(pinfo->cinfo, COL_INFO)) col_append_str(pinfo->cinfo, COL_INFO, " [Undesegmented]");
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if (tree)
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{
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proto_tree_add_item(tree, proto_mq, tvb, offset, -1, FALSE);
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@ -2280,6 +2309,91 @@ dissect_mq_pdu(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree)
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}
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}
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static void
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reassemble_mq(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree)
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{
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/* Reassembly of the MQ messages that span several PDU (several TSH) */
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/* Typically a TCP PDU is 1460 bytes and a MQ PDU is 32766 bytes */
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if (tvb_length(tvb) >= 28)
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{
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guint32 structId;
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structId = tvb_get_ntohl(tvb, 0);
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if (structId == MQ_STRUCTID_TSH || structId == MQ_STRUCTID_TSH_EBCDIC)
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{
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guint8 iControlFlags = 0;
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guint32 iSegmentLength = 0;
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guint32 iBeginLength = 0;
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guint8 opcode;
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gboolean bFirstSegment;
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gboolean bLastSegment;
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opcode = tvb_get_guint8(tvb, 9);
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iControlFlags = tvb_get_guint8(tvb, 10);
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iSegmentLength = tvb_get_ntohl(tvb, 4);
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bFirstSegment = ((iControlFlags & MQ_TCF_FIRST) != 0);
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bLastSegment = ((iControlFlags & MQ_TCF_LAST) != 0);
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if (opcode > 0x80 && !(bFirstSegment && bLastSegment))
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{
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/* Optimisation : only fragmented segments go through the reassembly process */
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if (mq_reassembly)
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{
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tvbuff_t* next_tvb;
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fragment_data* fd_head;
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guint32 iConnectionId = (pinfo->srcport + pinfo->destport);
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if (opcode > 0x80 && !bFirstSegment) iBeginLength = 28;
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fd_head = fragment_add_seq_next(tvb, iBeginLength, pinfo, iConnectionId, mq_fragment_table, mq_reassembled_table, iSegmentLength - iBeginLength, !bLastSegment);
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if (fd_head != NULL && pinfo->fd->num == fd_head->reassembled_in)
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{
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/* Reassembly finished */
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if (fd_head->next != NULL)
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{
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/* 2 or more fragments */
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next_tvb = tvb_new_real_data(fd_head->data, fd_head->len, fd_head->len);
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tvb_set_child_real_data_tvbuff(tvb, next_tvb);
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add_new_data_source(pinfo, next_tvb, "Reassembled MQ");
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}
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else
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{
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/* Only 1 fragment */
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next_tvb = tvb;
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}
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dissect_mq_pdu(next_tvb, pinfo, tree);
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return;
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}
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else
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{
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/* Reassembly in progress */
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if (check_col(pinfo->cinfo, COL_PROTOCOL)) col_set_str(pinfo->cinfo, COL_PROTOCOL, "MQ");
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if (check_col(pinfo->cinfo, COL_INFO)) col_add_fstr(pinfo->cinfo, COL_INFO, "%s [Reassembled MQ]", val_to_str(opcode, mq_opcode_vals, "Unknown (0x%02x)"));
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if (tree)
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{
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proto_item* ti = NULL;
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ti = proto_tree_add_item(tree, proto_mq, tvb, 0, -1, FALSE);
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proto_item_append_text(ti, " (%s) [Reassembled MQ]", val_to_str(opcode, mq_opcode_vals, "Unknown (0x%02x)"));
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}
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return;
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}
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}
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else
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{
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dissect_mq_pdu(tvb, pinfo, tree);
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if (bFirstSegment)
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{
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/* MQ segment is the first of a unreassembled series */
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if (check_col(pinfo->cinfo, COL_INFO)) col_append_str(pinfo->cinfo, COL_INFO, " [Unreassembled MQ]");
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}
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return;
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}
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}
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/* Reassembly not enabled or non-fragmented message */
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dissect_mq_pdu(tvb, pinfo, tree);
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return;
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}
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}
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}
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static guint
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get_mq_pdu_len(tvbuff_t *tvb, int offset)
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{
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@ -2294,12 +2408,13 @@ get_mq_pdu_len(tvbuff_t *tvb, int offset)
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static void
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dissect_mq_tcp(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree)
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{
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tcp_dissect_pdus(tvb, pinfo, tree, mq_desegment, 28, get_mq_pdu_len, dissect_mq_pdu);
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tcp_dissect_pdus(tvb, pinfo, tree, mq_desegment, 28, get_mq_pdu_len, reassemble_mq);
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}
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static void
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dissect_mq_spx(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree)
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{
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/* Since SPX has no standard desegmentation, MQ cannot be performed as well */
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dissect_mq_pdu(tvb, pinfo, tree);
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}
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@ -2326,7 +2441,7 @@ dissect_mq_heur(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree, gint iProto
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if (iProto == MQ_XPT_TCP) conversation_set_dissector(conversation, mq_tcp_handle);
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/* Dissect the packet */
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dissect_mq_pdu(tvb, pinfo, tree);
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reassemble_mq(tvb, pinfo, tree);
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return TRUE;
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}
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}
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@ -2351,6 +2466,13 @@ dissect_mq_heur_http(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree)
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return dissect_mq_heur(tvb, pinfo, tree, MQ_XPT_HTTP);
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}
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static void
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mq_init(void)
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{
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fragment_table_init(&mq_fragment_table);
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reassembled_table_init(&mq_reassembled_table);
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}
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void
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proto_register_mq(void)
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{
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@ -2385,18 +2507,6 @@ proto_register_mq(void)
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{ &hf_mq_tsh_padding,
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{ "Padding", "mq.tsh.padding", FT_UINT16, BASE_HEX, NULL, 0x0, "TSH Padding", HFILL }},
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{ &hf_mq_api_replylength,
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{ "Reply length", "mq.tsh.replylength", FT_UINT32, BASE_DEC, NULL, 0x0, "API Reply length", HFILL }},
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{ &hf_mq_api_completioncode,
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{ "Completion code", "mq.tsh.completioncode", FT_UINT32, BASE_DEC, NULL, 0x0, "API Completion code", HFILL }},
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{ &hf_mq_api_reasoncode,
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{ "Reason code", "mq.tsh.reasoncode", FT_UINT32, BASE_DEC, NULL, 0x0, "API Reason code", HFILL }},
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{ &hf_mq_api_objecthandle,
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{ "Object handle", "mq.tsh.hobj", FT_UINT32, BASE_HEX, NULL, 0x0, "API Object handle", HFILL }},
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{ &hf_mq_tsh_tcf_confirmreq,
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{ "Confirm request", "mq.tsh.tcf.confirmreq", FT_BOOLEAN, 8, TFS(&flags_set_truth), MQ_TCF_CONFIRM_REQUEST, "TSH TCF Confirm request", HFILL }},
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@ -2421,6 +2531,18 @@ proto_register_mq(void)
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{ &hf_mq_tsh_tcf_dlq,
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{ "DLQ used", "mq.tsh.tcf.dlq", FT_BOOLEAN, 8, TFS(&flags_set_truth), MQ_TCF_DLQ_USED, "TSH TCF DLQ used", HFILL }},
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{ &hf_mq_api_replylength,
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{ "Reply length", "mq.api.replylength", FT_UINT32, BASE_DEC, NULL, 0x0, "API Reply length", HFILL }},
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{ &hf_mq_api_completioncode,
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{ "Completion code", "mq.api.completioncode", FT_UINT32, BASE_DEC, NULL, 0x0, "API Completion code", HFILL }},
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{ &hf_mq_api_reasoncode,
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{ "Reason code", "mq.api.reasoncode", FT_UINT32, BASE_DEC, NULL, 0x0, "API Reason code", HFILL }},
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{ &hf_mq_api_objecthandle,
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{ "Object handle", "mq.api.hobj", FT_UINT32, BASE_HEX, NULL, 0x0, "API Object handle", HFILL }},
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{ &hf_mq_id_icf_msgseq,
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{ "Message sequence", "mq.id.icf.msgseq", FT_BOOLEAN, 8, TFS(&flags_set_truth), MQ_ICF_MSG_SEQ, "ID ICF Message sequence", HFILL }},
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@ -2676,12 +2798,21 @@ proto_register_mq(void)
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{ &hf_mq_ping_buffer,
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{ "Buffer", "mq.ping.buffer", FT_BYTES, BASE_DEC, NULL, 0x0, "PING buffer", HFILL }},
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{ &hf_mq_reset_length,
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||||
{ "Length", "mq.ping.length", FT_UINT32, BASE_DEC, NULL, 0x0, "RESET length", HFILL }},
|
||||
|
||||
{ &hf_mq_reset_seqnum,
|
||||
{ "Sequence number", "mq.ping.seqnum", FT_UINT32, BASE_DEC, NULL, 0x0, "RESET sequence number", HFILL }},
|
||||
|
||||
{ &hf_mq_status_length,
|
||||
{ "Length", "mq.status.length", FT_UINT32, BASE_DEC, NULL, 0x0, "STATUS length", HFILL }},
|
||||
|
||||
{ &hf_mq_status_code,
|
||||
{ "Code", "mq.status.code", FT_UINT32, BASE_DEC, VALS(mq_status_vals), 0x0, "STATUS code", HFILL }},
|
||||
|
||||
{ &hf_mq_status_value,
|
||||
{ "Value", "mq.status.value", FT_UINT32, BASE_DEC, NULL, 0x0, "STATUS value", HFILL }},
|
||||
|
||||
{ &hf_mq_od_structid,
|
||||
{ "OD structid", "mq.od.structid", FT_STRINGZ, BASE_HEX, NULL, 0x0, "OD structid", HFILL }},
|
||||
|
||||
|
@ -3095,6 +3226,7 @@ proto_register_mq(void)
|
|||
&ett_mq_put,
|
||||
&ett_mq_open,
|
||||
&ett_mq_ping,
|
||||
&ett_mq_reset,
|
||||
&ett_mq_status,
|
||||
&ett_mq_od,
|
||||
&ett_mq_or,
|
||||
|
@ -3120,12 +3252,17 @@ proto_register_mq(void)
|
|||
proto_register_subtree_array(ett, array_length(ett));
|
||||
|
||||
register_heur_dissector_list("mq", &mq_heur_subdissector_list);
|
||||
register_init_routine(mq_init);
|
||||
|
||||
mq_module = prefs_register_protocol(proto_mq, NULL);
|
||||
prefs_register_bool_preference(mq_module, "reassembly", /*"desegment",*/
|
||||
prefs_register_bool_preference(mq_module, "desegment",
|
||||
"Desegment all MQ messages spanning multiple TCP segments",
|
||||
"Whether the MQ dissector should desegment all messages spanning multiple TCP segments",
|
||||
&mq_desegment);
|
||||
prefs_register_bool_preference(mq_module, "reassembly",
|
||||
"Reassemble segmented MQ messages",
|
||||
"Whether the MQ dissector should reassemble all MQ messages spanning multiple TSH segments",
|
||||
&mq_reassembly);
|
||||
}
|
||||
|
||||
void
|
||||
|
|
Loading…
Reference in New Issue