--- /dev/null
+/* packet-redbackli.c
+ *
+ * Redback Lawful Intercept Packet dissector
+ *
+ * Copyright 2008 Florian Lohoff <flo[AT]rfc822.org>
+ *
+ * Wireshark - Network traffic analyzer
+ * By Gerald Combs <gerald[AT]wireshark.org>
+ * Copyright 1998 Gerald Combs
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License
+ * as published by the Free Software Foundation; either version 2
+ * of the License, or (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
+ */
+
+#ifdef HAVE_CONFIG_H
+#include "config.h"
+#endif
+
+#include <stdio.h>
+#include <stdlib.h>
+#include <ctype.h>
+#include <time.h>
+#include <string.h>
+
+#include <glib.h>
+#include <epan/packet.h>
+#include <epan/addr_resolv.h>
+#include <epan/prefs.h>
+#include <epan/strutil.h>
+
+void proto_reg_handoff_redbackli(void);
+static int proto_redbackli = -1;
+
+static int hf_redbackli_seqno = -1; /* Sequence No */
+static int hf_redbackli_liid = -1; /* LI Id */
+static int hf_redbackli_sessid = -1; /* Session Id */
+static int hf_redbackli_label = -1; /* Label */
+static int hf_redbackli_eohpad = -1; /* End Of Header Padding */
+static int hf_redbackli_unknownavp = -1; /* Unknown AVP */
+
+static int ett_redbackli = -1;
+
+static dissector_handle_t ip_handle;
+static dissector_handle_t redbackli_handle;
+
+#define RB_AVP_SEQNO 1
+#define RB_AVP_LIID 2
+#define RB_AVP_SESSID 3
+#define RB_AVP_LABEL 20
+#define RB_AVP_EOH 0
+
+static const value_string avp_names[] = {
+ {RB_AVP_SEQNO, "Sequence No"},
+ {RB_AVP_LIID, "Lawful Intercept Id"},
+ {RB_AVP_SESSID, "Session Id"},
+ {RB_AVP_LABEL, "Label"},
+ {RB_AVP_EOH, "End Of Header"},
+ {0, NULL},
+};
+
+static int
+redbackli_dissect_avp(guint8 avptype, guint8 avplen, tvbuff_t *tvb, gint offset, proto_tree *tree)
+{
+ guint32 avpintval;
+ char *avpcharval;
+ const char *avpname;
+ proto_tree *ti, *st=NULL;
+
+ avpname=val_to_str(avptype, avp_names, "Unknown");
+
+ if (tree) {
+ ti = proto_tree_add_text(tree, tvb, offset, avplen+2, "%s AVP", avpname);
+ st = proto_item_add_subtree(ti, ett_redbackli);
+
+ proto_tree_add_text(st, tvb, offset, 1, "AVP Type: %d", avptype);
+ proto_tree_add_text(st, tvb, offset+1, 1, "AVP Length: %d", avplen);
+ }
+
+ switch(avptype) {
+ case(RB_AVP_SEQNO):
+ avpintval=tvb_get_ntohl(tvb, offset+2);
+ if (tree)
+ proto_tree_add_uint(st, hf_redbackli_seqno, tvb,
+ offset+2, avplen, avpintval);
+ break;
+ case(RB_AVP_LIID):
+ avpintval=tvb_get_ntohl(tvb, offset+2);
+ if (tree)
+ proto_tree_add_uint(st, hf_redbackli_liid, tvb,
+ offset+2, avplen, avpintval);
+ break;
+ case(RB_AVP_SESSID):
+ avpintval=tvb_get_ntohl(tvb, offset+2);
+ if (tree)
+ proto_tree_add_uint(st, hf_redbackli_sessid, tvb,
+ offset+2, avplen, avpintval);
+ break;
+ case(RB_AVP_LABEL):
+ avpcharval=tvb_get_string(tvb, offset+2, avplen);
+ if (tree)
+ proto_tree_add_string(st, hf_redbackli_label, tvb,
+ offset+2, avplen, avpcharval);
+ break;
+ case(RB_AVP_EOH):
+ if (tree && avplen)
+ proto_tree_add_item(st, hf_redbackli_eohpad, tvb,
+ offset+2, avplen, FALSE);
+ return 1;
+ default:
+ if (tree && avplen)
+ proto_tree_add_item(st, hf_redbackli_unknownavp, tvb,
+ offset+2, avplen, FALSE);
+ return 0;
+ }
+
+ return 0;
+}
+
+static void
+redbackli_dissect(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree)
+{
+ guint8 avptype, avplen;
+ gint len, offset=0, eoh=0;
+ proto_tree *ti, *redbackli_tree=NULL;
+ tvbuff_t *next_tvb;
+
+ if(check_col(pinfo->cinfo,COL_PROTOCOL))
+ col_add_str(pinfo->cinfo,COL_PROTOCOL,"RBLI");
+
+ if (tree) {
+ ti = proto_tree_add_item(tree, proto_redbackli,
+ tvb, 0, -1, FALSE);
+ redbackli_tree = proto_item_add_subtree(ti, ett_redbackli);
+ }
+
+ len=tvb_length(tvb);
+ offset=0;
+ eoh=0;
+ while(!eoh && len > 2) {
+ avptype = tvb_get_guint8(tvb, offset+0);
+ avplen = tvb_get_guint8(tvb, offset+1);
+
+ if (len < avplen+2) /* AVP Complete ? */
+ break;
+
+ eoh=redbackli_dissect_avp(avptype, avplen, tvb, offset, redbackli_tree);
+
+ offset+=2+avplen;
+ len-=2+avplen;
+ }
+
+ next_tvb = tvb_new_subset(tvb, offset, -1, -1);
+ call_dissector(ip_handle, next_tvb, pinfo, tree);
+}
+
+
+#define REDBACKLI_INTSIZE 6
+#define REDBACKLI_EOHSIZE 2
+#define MIN_REDBACKLI_SIZE (3*REDBACKLI_INTSIZE+REDBACKLI_EOHSIZE)
+
+static gboolean
+redbackli_dissect_heur(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree)
+{
+ gint len, offset=0, eoh=0;
+ guint8 avptype, avplen;
+
+ len=tvb_length(tvb);
+ if (len < MIN_REDBACKLI_SIZE)
+ return FALSE;
+
+ /*
+ * We scan the possible AVPs and look out for mismatches.
+ * An int AVP needs to be 4 byte long, and the eoh must be 0 or 1
+ * long .. Unknown AVPs also mean not for us ...
+ *
+ */
+ while(len > 2 && !eoh) {
+ avptype = tvb_get_guint8(tvb, offset+0);
+ avplen = tvb_get_guint8(tvb, offset+1);
+
+ switch(avptype) {
+ case(RB_AVP_SEQNO):
+ case(RB_AVP_LIID):
+ case(RB_AVP_SESSID):
+ if (avplen != 4)
+ return FALSE;
+ break;
+ case(RB_AVP_LABEL):
+ break;
+ case(RB_AVP_EOH):
+ if (avplen > 1)
+ return FALSE;
+ eoh=1;
+ break;
+ default:
+ return FALSE;
+ }
+ offset+=2+avplen;
+ len-=2+avplen;
+ }
+
+ redbackli_dissect(tvb, pinfo, tree);
+
+ return TRUE;
+}
+void proto_register_redbackli(void) {
+ static hf_register_info hf[] = {
+ { &hf_redbackli_seqno,
+ { "Sequence No", "redbackli.seqno", FT_UINT32, BASE_DEC, NULL, 0x0,
+ "Sequence No", HFILL }},
+ { &hf_redbackli_liid,
+ { "Lawful Intercept Id", "redbackli.liid", FT_UINT32, BASE_DEC, NULL, 0x0,
+ "LI Identifier", HFILL }},
+ { &hf_redbackli_sessid,
+ { "Session Id", "redbackli.sessid", FT_UINT32, BASE_DEC, NULL, 0x0,
+ "Session Identifier", HFILL }},
+ { &hf_redbackli_label,
+ { "Label", "redbackli.label", FT_STRING, BASE_NONE, NULL, 0x0,
+ "Label", HFILL }},
+ { &hf_redbackli_eohpad,
+ { "End of Header Padding", "redbackli.eohpad", FT_BYTES, BASE_HEX, NULL, 0x0,
+ "", HFILL }},
+ { &hf_redbackli_unknownavp,
+ { "Unknown AVP", "redbackli.unknownavp", FT_BYTES, BASE_HEX, NULL, 0x0,
+ "", HFILL }},
+ };
+
+ static gint *ett[] = {
+ &ett_redbackli,
+ };
+
+ proto_redbackli = proto_register_protocol("Redback Lawful Intercept",
+ "RedbackLI","redbackli");
+
+ proto_register_field_array(proto_redbackli,hf,array_length(hf));
+ proto_register_subtree_array(ett,array_length(ett));
+
+ register_dissector("redbackli", redbackli_dissect, proto_redbackli);
+}
+
+void proto_reg_handoff_redbackli(void) {
+ ip_handle = find_dissector("ip");
+
+ redbackli_handle = find_dissector("redbackli");
+ dissector_add_handle("udp.port", redbackli_handle);
+
+ heur_dissector_add("udp", redbackli_dissect_heur, proto_redbackli);
+}
git.samba.org / obnox / wireshark / wip.git / commitdiff