Adding upstream version 4.2.2.upstream/4.2.2

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

1 files changed, 237 insertions, 0 deletions

diff --git a/epan/dissectors/packet-srp.c b/epan/dissectors/packet-srp.c
new file mode 100644
index 00000000..557c9dfb
--- /dev/null
+++ b/epan/dissectors/packet-srp.c
@@ -0,0 +1,237 @@
+/* packet-srp.c
+ * Routines for H.324/SRP dissection
+ * 2004 Richard van der Hoff <richardv@mxtelecom.com>
+ *
+ * Wireshark - Network traffic analyzer
+ * By Gerald Combs <gerald@wireshark.org>
+ * Copyright 1998 Gerald Combs
+ *
+ * SPDX-License-Identifier: GPL-2.0-or-later
+ */
+
+#include "config.h"
+
+#include <epan/packet.h>
+#include <epan/crc16-tvb.h>
+
+void proto_register_srp(void);
+void proto_register_ccsrl(void);
+void proto_reg_handoff_srp(void);
+
+/* Wireshark ID of the protocols */
+static int proto_srp = -1;
+static int proto_ccsrl = -1;
+
+/* The following hf_* variables are used to hold the Wireshark IDs of
+ * our header fields; they are filled out when we call
+ * proto_register_field_array() in proto_register_srp()
+ */
+static int hf_srp_header = -1;
+static int hf_srp_seqno = -1;
+static int hf_srp_crc = -1;
+static int hf_srp_crc_bad = -1;
+static int hf_ccsrl_ls = -1;
+
+/* These are the ids of the subtrees that we may be creating */
+static gint ett_srp = -1;
+static gint ett_ccsrl = -1;
+
+static dissector_handle_t ccsrl_handle;
+static dissector_handle_t h245dg_handle;
+
+/*****************************************************************************/
+#define SRP_SRP_COMMAND 249
+#define SRP_SRP_RESPONSE 251
+#define SRP_NSRP_RESPONSE 247
+
+/* WNSRP definitions */
+#define WNSRP_COMMAND_HEADER 241
+#define WNSRP_RESPONSE_HEADER 243
+
+static const value_string srp_frame_types[] = {
+    {SRP_SRP_COMMAND, "SRP command"},
+    {SRP_SRP_RESPONSE, "SRP response"},
+    {SRP_NSRP_RESPONSE, "NSRP response"},
+    {WNSRP_COMMAND_HEADER, "WNSRP command"},
+    {WNSRP_RESPONSE_HEADER, "WNSRP response"},
+    {0,NULL}
+};
+
+static const value_string ccsrl_ls_vals[] = {
+    {0xFF, "Yes"},
+    {0x00, "No"},
+    {0,NULL}
+};
+
+/*****************************************************************************/
+
+static int dissect_ccsrl(tvbuff_t * tvb, packet_info * pinfo, proto_tree * tree, void* data _U_)
+{
+    proto_item *ccsrl_item;
+    proto_tree *ccsrl_tree=NULL;
+    guint8 lastseg = tvb_get_guint8(tvb,0);
+    tvbuff_t *next_tvb;
+
+    /* add the 'ccsrl' tree to the main tree */
+    if (tree) {
+        ccsrl_item = proto_tree_add_item (tree, proto_ccsrl, tvb, 0, -1, ENC_NA);
+        ccsrl_tree = proto_item_add_subtree (ccsrl_item, ett_ccsrl);
+        proto_tree_add_uint(ccsrl_tree,hf_ccsrl_ls,tvb,0,1,lastseg);
+    }
+
+    /* XXX add support for reassembly of fragments */
+
+    /* XXX currently, we always dissect as H245. It's not necessarily
+        that though.
+    */
+    next_tvb = tvb_new_subset_remaining(tvb, 1);
+    call_dissector( h245dg_handle, next_tvb, pinfo, ccsrl_tree );
+    return tvb_captured_length(tvb);
+}
+
+static void dissect_srp_command(tvbuff_t * tvb, packet_info * pinfo, proto_tree * srp_tree)
+{
+    tvbuff_t *next_tvb;
+    guint payload_len;
+
+    if( srp_tree )
+        proto_tree_add_item(srp_tree,hf_srp_seqno,tvb,1,1,ENC_BIG_ENDIAN);
+
+    payload_len = tvb_reported_length_remaining(tvb,4);
+    next_tvb = tvb_new_subset_length(tvb, 2, payload_len);
+
+    /* XXX currently, we always dissect as CCSRL. It's only that in
+     * H324/Annex C though.
+     */
+    call_dissector(ccsrl_handle, next_tvb, pinfo, srp_tree );
+}
+
+static int dissect_srp (tvbuff_t * tvb, packet_info * pinfo, proto_tree * tree, void* data _U_)
+{
+    proto_item *srp_item = NULL;
+    proto_tree *srp_tree = NULL;
+    proto_item *hidden_item;
+
+    guint8 header = tvb_get_guint8(tvb,0);
+
+    /* add the 'srp' tree to the main tree */
+    if (tree) {
+        srp_item = proto_tree_add_item (tree, proto_srp, tvb, 0, -1, ENC_NA);
+        srp_tree = proto_item_add_subtree (srp_item, ett_srp);
+        proto_tree_add_uint(srp_tree,hf_srp_header,tvb,0,1,header);
+    }
+
+    switch( header ) {
+        case SRP_SRP_COMMAND:
+        case WNSRP_COMMAND_HEADER:
+            dissect_srp_command(tvb,pinfo,srp_tree);
+            break;
+
+        case SRP_SRP_RESPONSE:
+            break;
+
+        case SRP_NSRP_RESPONSE:
+        case WNSRP_RESPONSE_HEADER:
+            if( srp_tree )
+                proto_tree_add_item(srp_tree,hf_srp_seqno,tvb,1,1,ENC_BIG_ENDIAN);
+            break;
+
+        default:
+            break;
+    }
+
+    if( srp_tree ) {
+        guint16 crc, calc_crc;
+        guint crc_offset = tvb_reported_length(tvb)-2;
+        crc = tvb_get_letohs(tvb,-2);
+
+        /* crc includes the header */
+        calc_crc = crc16_ccitt_tvb(tvb,crc_offset);
+
+        if( crc == calc_crc ) {
+            proto_tree_add_uint_format_value(srp_tree, hf_srp_crc, tvb,
+                                       crc_offset, 2, crc,
+                                       "0x%04x (correct)", crc);
+        } else {
+            hidden_item = proto_tree_add_boolean(srp_tree, hf_srp_crc_bad, tvb,
+                                          crc_offset, 2, TRUE);
+            proto_item_set_hidden(hidden_item);
+            proto_tree_add_uint_format_value(srp_tree, hf_srp_crc, tvb,
+                                       crc_offset, 2, crc,
+                                       "0x%04x (incorrect, should be 0x%04x)",
+                                       crc,
+                                       calc_crc);
+        }
+    }
+
+    return tvb_captured_length(tvb);
+}
+
+void proto_register_ccsrl (void)
+{
+    static hf_register_info hf[] = {
+        { &hf_ccsrl_ls,
+          { "Last Segment","ccsrl.ls",FT_UINT8, BASE_HEX, VALS(ccsrl_ls_vals), 0x0,
+            "Last segment indicator", HFILL}},
+    };
+
+    static gint *ett[] = {
+        &ett_ccsrl,
+    };
+
+    proto_ccsrl = proto_register_protocol ("H.324/CCSRL", "CCSRL", "ccsrl");
+    proto_register_field_array (proto_ccsrl, hf, array_length (hf));
+    proto_register_subtree_array (ett, array_length (ett));
+    register_dissector("ccsrl", dissect_ccsrl, proto_ccsrl);
+}
+
+void proto_register_srp (void)
+{
+    static hf_register_info hf[] = {
+        {&hf_srp_header,
+         { "Header", "srp.header", FT_UINT8, BASE_DEC, VALS(srp_frame_types), 0x0,
+           "SRP header octet", HFILL }},
+        {&hf_srp_seqno,
+         { "Sequence Number", "srp.seqno", FT_UINT8, BASE_DEC, NULL, 0x0,
+           NULL, HFILL }},
+        {&hf_srp_crc,
+         { "CRC", "srp.crc", FT_UINT16, BASE_HEX, NULL, 0x0,
+           NULL, HFILL }},
+        { &hf_srp_crc_bad,
+          { "Bad CRC","srp.crc_bad", FT_BOOLEAN, BASE_NONE, NULL, 0x0,
+            NULL, HFILL }},
+    };
+
+    static gint *ett[] = {
+        &ett_srp,
+    };
+
+    proto_srp = proto_register_protocol ("H.324/SRP", "SRP", "srp");
+    proto_register_field_array (proto_srp, hf, array_length (hf));
+    proto_register_subtree_array (ett, array_length (ett));
+    register_dissector("srp", dissect_srp, proto_srp);
+
+    /* register our init routine to be called at the start of a capture,
+       to clear out our hash tables etc */
+    /* register_init_routine(&srp_init_protocol); */
+
+}
+
+
+void proto_reg_handoff_srp(void) {
+    ccsrl_handle = find_dissector_add_dependency("ccsrl", proto_srp);
+    h245dg_handle = find_dissector_add_dependency("h245dg", proto_srp);
+}
+
+/*
+ * 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:
+ */