Adding upstream version 4.2.2.upstream/4.2.2

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 267 insertions, 0 deletions

diff --git a/epan/dissectors/packet-smp.c b/epan/dissectors/packet-smp.c
new file mode 100644
index 00000000..989034f1
--- /dev/null
+++ b/epan/dissectors/packet-smp.c
@@ -0,0 +1,267 @@
+/* packet-smp.c
+ * Routines for Session Multiplex Protocol (SMP) dissection
+ * January 2017 Uli Heilmeier with the help of Michael Mann
+ *
+ * Wireshark - Network traffic analyzer
+ * By Gerald Combs <gerald@wireshark.org>
+ * Copyright 1998 Gerald Combs
+ *
+ * SPDX-License-Identifier: GPL-2.0-or-later
+ */
+
+/*
+ * References:
+ *
+ *    MC-SMP - https://docs.microsoft.com/en-us/openspecs/windows_protocols/mc-smp
+ *    MS-TDS - https://docs.microsoft.com/en-us/openspecs/windows_protocols/ms-tds
+ *    https://docs.microsoft.com/en-us/sql/relational-databases/native-client/features/using-multiple-active-result-sets-mars
+ *
+ *     0                   1                   2                   3
+ *     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
+ *    +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
+ *    |       SMID    |     FLAGS     |               SID             |
+ *    +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
+ *    |                           LENGTH                              |
+ *    +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
+ *    |                           SEQNUM                              |
+ *    +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
+ *    |                            WNDW                               |
+ *    +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
+ *    |                                                               |
+ *    /                         DATA (variable)                       /
+ *    |                                                               |
+ *    +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
+ */
+
+#include <config.h>
+#include <epan/packet.h>
+#include <epan/prefs.h>
+#include <epan/decode_as.h>
+
+#include "packet-tcp.h"
+
+void proto_reg_handoff_smp(void);
+void proto_register_smp(void);
+
+static int proto_smp = -1;
+
+static int hf_smp_smid = -1;
+static int hf_smp_flags = -1;
+static int hf_smp_flags_syn = -1;
+static int hf_smp_flags_ack = -1;
+static int hf_smp_flags_fin = -1;
+static int hf_smp_flags_data = -1;
+static int hf_smp_sid = -1;
+static int hf_smp_length = -1;
+static int hf_smp_seqnum = -1;
+static int hf_smp_wndw = -1;
+static int hf_smp_data = -1;
+
+static gint ett_smp = -1;
+static gint ett_smp_flags = -1;
+
+#define SMP_FLAGS_SYN  0x01
+#define SMP_FLAGS_ACK  0x02
+#define SMP_FLAGS_FIN  0x04
+#define SMP_FLAGS_DATA 0x08
+
+#define SMP_MIN_LENGTH 16
+
+static dissector_handle_t tds_handle;
+static dissector_handle_t smp_handle;
+static dissector_table_t smp_payload_table;
+
+static gboolean reassemble_smp = TRUE;
+
+static void smp_prompt(packet_info *pinfo _U_, gchar* result)
+{
+    snprintf(result, MAX_DECODE_AS_PROMPT_LEN, "Payload as");
+}
+
+/* Code to actually dissect the packets */
+static int
+dissect_smp_common(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree, gboolean tds_payload)
+{
+    guint offset = 0;
+    guint remaining_bytes;
+    proto_item *ti;
+    proto_tree *smp_tree;
+    guint32 flags, sid, smp_length;
+    tvbuff_t* next_tvb;
+    int parsed_bytes;
+    static int * const flag_fields[] = {
+        &hf_smp_flags_syn,
+        &hf_smp_flags_ack,
+        &hf_smp_flags_fin,
+        &hf_smp_flags_data,
+        NULL
+    };
+
+    if (tvb_reported_length(tvb) < SMP_MIN_LENGTH)
+        return 0;
+
+    col_set_str(pinfo->cinfo, COL_PROTOCOL, "SMP");
+    col_clear(pinfo->cinfo, COL_INFO);
+
+    ti = proto_tree_add_item(tree, proto_smp, tvb, 0, -1, ENC_NA);
+    smp_tree = proto_item_add_subtree(ti, ett_smp);
+
+    proto_tree_add_item(smp_tree, hf_smp_smid, tvb, offset, 1, ENC_NA);
+    offset+=1;
+
+    proto_tree_add_bitmask(smp_tree, tvb, offset, hf_smp_flags, ett_smp_flags, flag_fields, ENC_NA);
+    flags = tvb_get_guint8(tvb, offset);
+    offset += 1;
+
+    proto_tree_add_item_ret_uint(smp_tree, hf_smp_sid, tvb, offset, 2, ENC_LITTLE_ENDIAN, &sid);
+    col_append_fstr(pinfo->cinfo, COL_INFO, "SID: %u", sid);
+    offset += 2;
+
+    if (flags & SMP_FLAGS_SYN)
+        col_append_str(pinfo->cinfo, COL_INFO, ", Syn");
+    if (flags & SMP_FLAGS_ACK)
+        col_append_str(pinfo->cinfo, COL_INFO, ", Ack");
+    if (flags & SMP_FLAGS_FIN)
+        col_append_str(pinfo->cinfo, COL_INFO, ", Fin");
+    if (flags & SMP_FLAGS_DATA)
+        col_append_str(pinfo->cinfo, COL_INFO, ", Data");
+
+    proto_tree_add_item_ret_uint(smp_tree, hf_smp_length, tvb, offset, 4, ENC_LITTLE_ENDIAN, &smp_length);
+    offset += 4;
+
+    proto_tree_add_item(smp_tree, hf_smp_seqnum, tvb, offset, 4, ENC_LITTLE_ENDIAN);
+    offset += 4;
+
+    proto_tree_add_item(smp_tree, hf_smp_wndw, tvb, offset, 4, ENC_LITTLE_ENDIAN);
+    offset += 4;
+
+    if ((flags & SMP_FLAGS_DATA) && (tvb_reported_length(tvb) > SMP_MIN_LENGTH)) {
+
+        next_tvb = tvb_new_subset_remaining(tvb, offset);
+        if (tds_payload) {
+            parsed_bytes = call_dissector(tds_handle, next_tvb, pinfo, tree);
+        } else {
+            parsed_bytes = dissector_try_payload(smp_payload_table, next_tvb, pinfo, tree);
+        }
+        if (parsed_bytes <= 0)
+        {
+            remaining_bytes = tvb_reported_length_remaining(tvb, offset);
+            if ( remaining_bytes < (smp_length - SMP_MIN_LENGTH)) {
+                // Fragmented
+                proto_tree_add_item(smp_tree, hf_smp_data, tvb, offset, remaining_bytes, ENC_NA);
+                offset += remaining_bytes;
+            }
+            else {
+                proto_tree_add_item(smp_tree, hf_smp_data, tvb, offset, smp_length - SMP_MIN_LENGTH, ENC_NA);
+                offset += (smp_length - SMP_MIN_LENGTH);
+            }
+        }
+        else {
+            offset += parsed_bytes;
+        }
+    }
+
+    return offset;
+}
+
+static guint get_smp_pdu_len(packet_info *pinfo _U_, tvbuff_t *tvb, int offset, void *data _U_)
+{
+    return tvb_get_letohl(tvb, offset + 4);
+}
+
+static int
+dissect_smp_pdu(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree, void *data _U_)
+{
+    return dissect_smp_common(tvb, pinfo, tree, FALSE);
+}
+
+static int dissect_smp(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree, void* data)
+{
+    if ((tvb_reported_length(tvb) > 0) && (tvb_get_guint8(tvb, 0) == 0x53)) {
+        tcp_dissect_pdus(tvb, pinfo, tree, reassemble_smp, SMP_MIN_LENGTH,
+                     get_smp_pdu_len, dissect_smp_pdu, data);
+
+        return tvb_captured_length(tvb);
+    }
+
+    return 0;
+}
+
+static int
+dissect_smp_tds(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree, void *data _U_)
+{
+    return dissect_smp_common(tvb, pinfo, tree, TRUE);
+}
+
+void
+proto_register_smp(void)
+{
+    static hf_register_info hf[] = {
+        { &hf_smp_smid,
+          { "Smid", "smp.smid", FT_UINT8, BASE_HEX, NULL, 0, NULL, HFILL }},
+        { &hf_smp_flags,
+          { "Flags", "smp.flags", FT_UINT8, BASE_HEX, NULL, 0, NULL, HFILL } },
+        { &hf_smp_flags_syn,
+          { "Syn", "smp.flags.syn", FT_BOOLEAN, 8, TFS(&tfs_set_notset), SMP_FLAGS_SYN, NULL, HFILL }},
+        { &hf_smp_flags_ack,
+          { "Ack", "smp.flags.ack", FT_BOOLEAN, 8, TFS(&tfs_set_notset), SMP_FLAGS_ACK, NULL, HFILL }},
+        { &hf_smp_flags_fin,
+          { "Fin", "smp.flags.fin", FT_BOOLEAN, 8, TFS(&tfs_set_notset), SMP_FLAGS_FIN, NULL, HFILL }},
+        { &hf_smp_flags_data,
+          { "Data", "smp.flags.data", FT_BOOLEAN, 8, TFS(&tfs_set_notset), SMP_FLAGS_DATA, NULL, HFILL }},
+        { &hf_smp_sid,
+          { "SID", "smp.sid", FT_UINT16, BASE_DEC, NULL, 0, "Session ID", HFILL }},
+        { &hf_smp_length,
+          { "Length", "smp.length", FT_UINT32, BASE_DEC, NULL, 0, NULL, HFILL }},
+        { &hf_smp_seqnum,
+          { "SeqNum", "smp.seqnum", FT_UINT32, BASE_HEX, NULL, 0, "Sequence Number", HFILL }},
+        { &hf_smp_wndw,
+          { "Wndw", "smp.wndw", FT_UINT32, BASE_HEX, NULL, 0, "Window Size", HFILL }},
+        { &hf_smp_data,
+          { "Data", "smp.data", FT_BYTES, BASE_NONE, NULL, 0, NULL, HFILL }},
+    };
+
+    static gint *ett[] = {
+        &ett_smp,
+        &ett_smp_flags,
+    };
+
+    module_t *smp_module;
+
+    proto_smp = proto_register_protocol("Session Multiplex Protocol", "SMP", "smp");
+
+    proto_register_field_array(proto_smp, hf, array_length(hf));
+    proto_register_subtree_array(ett, array_length(ett));
+    register_dissector("smp_tds", dissect_smp_tds, proto_smp);
+    smp_handle = register_dissector("smp", dissect_smp, proto_smp);
+
+    smp_payload_table = register_decode_as_next_proto(proto_smp, "smp.payload", "SMP Payload", smp_prompt);
+
+    smp_module = prefs_register_protocol(proto_smp, NULL);
+    prefs_register_bool_preference(smp_module, "desegment",
+          "Reassemble SMP messages spanning multiple TCP segments",
+          "Whether the SMP dissector should reassemble messages spanning multiple TCP segments."
+          " To use this option, you must also enable \"Allow subdissectors to reassemble TCP streams\" in the TCP protocol settings.",
+          &reassemble_smp);
+}
+
+void
+proto_reg_handoff_smp(void)
+{
+    dissector_add_for_decode_as_with_preference("tcp.port", smp_handle);
+
+    tds_handle = find_dissector_add_dependency("tds", proto_smp);
+}
+
+/*
+ * Editor modelines  -  https://www.wireshark.org/tools/modelines.html
+ *
+ * Local variables:
+ * c-basic-offset: 4
+ * tab-width: 8
+ * indent-tabs-mode: nil
+ * End:
+ *
+ * vi: set shiftwidth=4 tabstop=8 expandtab:
+ * :indentSize=4:tabSize=8:noTabs=true:
+ */