forked from osmocom/wireshark
![Guy Harris](/assets/img/avatar_default.png)
build_label_func is a pointer type, pointing to a function that can be used to generate a label for a "Decode As" entry. There's no need to have pointers to those pointers; have register_decode_as_next_proto() take a build_label_func, not a build_label_func *, as its last argument, assign that value rather than dereferencing it, get rid of unnecessary casts, and fix the comment in epan/decode_as.h for that argument. Change-Id: Idc3cf18204c543a2191b122c8129b362562c0ecd Reviewed-on: https://code.wireshark.org/review/25773 Reviewed-by: Guy Harris <guy@alum.mit.edu>
267 lines
9.2 KiB
C
267 lines
9.2 KiB
C
/* packet-smp.c
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* Routines for Session Multiplex Protocol (SMP) dissection
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* January 2017 Uli Heilmeier with the help of Michael Mann
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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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* SPDX-License-Identifier: GPL-2.0-or-later
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*/
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/*
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* References:
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* https://web.archive.org/web/20171009015219/https://msdn.microsoft.com/en-us/library/cc219643.aspx
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* https://web.archive.org/web/20171223021159/https://msdn.microsoft.com/en-us/library/dd304523.aspx
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* https://web.archive.org/web/20171005092351/https://docs.microsoft.com/en-us/sql/relational-databases/native-client/features/using-multiple-active-result-sets-mars
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*
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* 0 1 2 3
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* 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1
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* +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
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* | SMID | FLAGS | SID |
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* +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
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* | LENGTH |
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* +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
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* | SEQNUM |
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* +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
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* | WNDW |
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* +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
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* | |
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* / DATA (variable) /
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* | |
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* +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
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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/prefs.h>
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#include <epan/decode_as.h>
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#include "packet-tcp.h"
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void proto_reg_handoff_smp(void);
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void proto_register_smp(void);
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static int proto_smp = -1;
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static int hf_smp_smid = -1;
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static int hf_smp_flags = -1;
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static int hf_smp_flags_syn = -1;
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static int hf_smp_flags_ack = -1;
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static int hf_smp_flags_fin = -1;
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static int hf_smp_flags_data = -1;
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static int hf_smp_sid = -1;
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static int hf_smp_length = -1;
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static int hf_smp_seqnum = -1;
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static int hf_smp_wndw = -1;
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static int hf_smp_data = -1;
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static gint ett_smp = -1;
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static gint ett_smp_flags = -1;
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#define SMP_FLAGS_SYN 0x01
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#define SMP_FLAGS_ACK 0x02
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#define SMP_FLAGS_FIN 0x04
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#define SMP_FLAGS_DATA 0x08
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#define SMP_MIN_LENGTH 16
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static dissector_handle_t tds_handle;
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static dissector_table_t smp_payload_table;
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static gboolean reassemble_smp = TRUE;
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static void smp_prompt(packet_info *pinfo _U_, gchar* result)
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{
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g_snprintf(result, MAX_DECODE_AS_PROMPT_LEN, "Payload as");
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}
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/* Code to actually dissect the packets */
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static int
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dissect_smp_common(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree, gboolean tds_payload)
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{
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guint offset = 0;
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guint remaining_bytes;
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proto_item *ti;
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proto_tree *smp_tree;
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guint32 flags, sid, smp_length;
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tvbuff_t* next_tvb;
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int parsed_bytes;
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static const int *flag_fields[] = {
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&hf_smp_flags_syn,
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&hf_smp_flags_ack,
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&hf_smp_flags_fin,
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&hf_smp_flags_data,
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NULL
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};
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if (tvb_reported_length(tvb) < SMP_MIN_LENGTH)
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return 0;
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col_set_str(pinfo->cinfo, COL_PROTOCOL, "SMP");
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col_clear(pinfo->cinfo, COL_INFO);
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ti = proto_tree_add_item(tree, proto_smp, tvb, 0, -1, ENC_NA);
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smp_tree = proto_item_add_subtree(ti, ett_smp);
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proto_tree_add_item(smp_tree, hf_smp_smid, tvb, offset, 1, ENC_NA);
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offset+=1;
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proto_tree_add_bitmask(smp_tree, tvb, offset, hf_smp_flags, ett_smp_flags, flag_fields, ENC_NA);
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flags = tvb_get_guint8(tvb, offset);
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offset += 1;
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proto_tree_add_item_ret_uint(smp_tree, hf_smp_sid, tvb, offset, 2, ENC_LITTLE_ENDIAN, &sid);
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col_append_fstr(pinfo->cinfo, COL_INFO, "SID: %u", sid);
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offset += 2;
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if (flags & SMP_FLAGS_SYN)
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col_append_str(pinfo->cinfo, COL_INFO, ", Syn");
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if (flags & SMP_FLAGS_ACK)
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col_append_str(pinfo->cinfo, COL_INFO, ", Ack");
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if (flags & SMP_FLAGS_FIN)
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col_append_str(pinfo->cinfo, COL_INFO, ", Fin");
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if (flags & SMP_FLAGS_DATA)
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col_append_str(pinfo->cinfo, COL_INFO, ", Data");
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proto_tree_add_item_ret_uint(smp_tree, hf_smp_length, tvb, offset, 4, ENC_LITTLE_ENDIAN, &smp_length);
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offset += 4;
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proto_tree_add_item(smp_tree, hf_smp_seqnum, tvb, offset, 4, ENC_LITTLE_ENDIAN);
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offset += 4;
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proto_tree_add_item(smp_tree, hf_smp_wndw, tvb, offset, 4, ENC_LITTLE_ENDIAN);
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offset += 4;
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if ((flags & SMP_FLAGS_DATA) && (tvb_reported_length(tvb) > SMP_MIN_LENGTH)) {
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next_tvb = tvb_new_subset_remaining(tvb, offset);
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if (tds_payload) {
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parsed_bytes = call_dissector(tds_handle, next_tvb, pinfo, tree);
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} else {
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parsed_bytes = dissector_try_payload(smp_payload_table, next_tvb, pinfo, tree);
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}
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if (parsed_bytes <= 0)
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{
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remaining_bytes = tvb_reported_length_remaining(tvb, offset);
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if ( remaining_bytes < (smp_length - SMP_MIN_LENGTH)) {
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// Fragmented
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proto_tree_add_item(smp_tree, hf_smp_data, tvb, offset, remaining_bytes, ENC_NA);
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offset += remaining_bytes;
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}
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else {
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proto_tree_add_item(smp_tree, hf_smp_data, tvb, offset, smp_length - SMP_MIN_LENGTH, ENC_NA);
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offset += (smp_length - SMP_MIN_LENGTH);
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}
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}
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else {
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offset += parsed_bytes;
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}
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}
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return offset;
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}
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static guint get_smp_pdu_len(packet_info *pinfo _U_, tvbuff_t *tvb, int offset, void *data _U_)
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{
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return tvb_get_letohl(tvb, offset + 4);
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}
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static int
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dissect_smp_pdu(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree, void *data _U_)
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{
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return dissect_smp_common(tvb, pinfo, tree, FALSE);
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}
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static int dissect_smp(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree, void* data)
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{
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if ((tvb_reported_length(tvb) > 0) && (tvb_get_guint8(tvb, 0) == 0x53)) {
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tcp_dissect_pdus(tvb, pinfo, tree, reassemble_smp, SMP_MIN_LENGTH,
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get_smp_pdu_len, dissect_smp_pdu, data);
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return tvb_captured_length(tvb);
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}
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return 0;
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}
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static int
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dissect_smp_tds(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree, void *data _U_)
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{
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return dissect_smp_common(tvb, pinfo, tree, TRUE);
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}
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void
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proto_register_smp(void)
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{
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static hf_register_info hf[] = {
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{ &hf_smp_smid,
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{ "Smid", "smp.smid", FT_UINT8, BASE_HEX, NULL, 0, NULL, HFILL }},
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{ &hf_smp_flags,
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{ "Flags", "smp.flags", FT_UINT8, BASE_HEX, NULL, 0, NULL, HFILL } },
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{ &hf_smp_flags_syn,
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{ "Syn", "smp.flags.syn", FT_BOOLEAN, 8, TFS(&tfs_set_notset), SMP_FLAGS_SYN, NULL, HFILL }},
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{ &hf_smp_flags_ack,
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{ "Ack", "smp.flags.ack", FT_BOOLEAN, 8, TFS(&tfs_set_notset), SMP_FLAGS_ACK, NULL, HFILL }},
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{ &hf_smp_flags_fin,
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{ "Fin", "smp.flags.fin", FT_BOOLEAN, 8, TFS(&tfs_set_notset), SMP_FLAGS_FIN, NULL, HFILL }},
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{ &hf_smp_flags_data,
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{ "Data", "smp.flags.data", FT_BOOLEAN, 8, TFS(&tfs_set_notset), SMP_FLAGS_DATA, NULL, HFILL }},
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{ &hf_smp_sid,
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{ "SID", "smp.sid", FT_UINT16, BASE_DEC, NULL, 0, "Session ID", HFILL }},
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{ &hf_smp_length,
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{ "Length", "smp.length", FT_UINT32, BASE_DEC, NULL, 0, NULL, HFILL }},
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{ &hf_smp_seqnum,
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{ "SeqNum", "smp.seqnum", FT_UINT32, BASE_HEX, NULL, 0, "Sequence Number", HFILL }},
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{ &hf_smp_wndw,
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{ "Wndw", "smp.wndw", FT_UINT32, BASE_HEX, NULL, 0, "Window Size", HFILL }},
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{ &hf_smp_data,
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{ "Data", "smp.data", FT_BYTES, BASE_NONE, NULL, 0, NULL, HFILL }},
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};
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static gint *ett[] = {
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&ett_smp,
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&ett_smp_flags,
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};
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module_t *smp_module;
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proto_smp = proto_register_protocol("Session Multiplex Protocol", "SMP", "smp");
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proto_register_field_array(proto_smp, hf, array_length(hf));
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proto_register_subtree_array(ett, array_length(ett));
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register_dissector("smp_tds", dissect_smp_tds, proto_smp);
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smp_payload_table = register_decode_as_next_proto(proto_smp, "SMP Payload", "smp.payload", "SMP Payload", smp_prompt);
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smp_module = prefs_register_protocol(proto_smp, NULL);
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prefs_register_bool_preference(smp_module, "desegment",
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"Reassemble SMP messages spanning multiple TCP segments",
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"Whether the SMP dissector should reassemble messages spanning multiple TCP segments."
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" To use this option, you must also enable \"Allow subdissectors to reassemble TCP streams\" in the TCP protocol settings.",
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&reassemble_smp);
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}
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void
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proto_reg_handoff_smp(void)
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{
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dissector_handle_t smp_handle;
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smp_handle = create_dissector_handle(dissect_smp, proto_smp);
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dissector_add_for_decode_as_with_preference("tcp.port", smp_handle);
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tds_handle = find_dissector_add_dependency("tds", proto_smp);
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}
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/*
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* Editor modelines - https://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: 8
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* indent-tabs-mode: nil
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* End:
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*
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* vi: set shiftwidth=4 tabstop=8 expandtab:
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* :indentSize=4:tabSize=8:noTabs=true:
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*/
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