/* packet-idmp.c * Routines for X.519 Internet Directly Mapped Procotol (IDMP) packet dissection * Graeme Lunt 2010 * * Wireshark - Network traffic analyzer * By Gerald Combs * Copyright 1998 Gerald Combs * * SPDX-License-Identifier: GPL-2.0-or-later */ #include "config.h" #include #include #include #include #include #include #include #include #include #include "packet-tcp.h" #include "packet-ber.h" #include "packet-ros.h" #include "packet-x509ce.h" #define PNAME "X.519 Internet Directly Mapped Protocol" #define PSNAME "IDMP" #define PFNAME "idmp" void proto_register_idmp(void); void proto_reg_handoff_idm(void); void register_idmp_protocol_info(const char *oid, const ros_info_t *rinfo, int proto _U_, const char *name); static gboolean idmp_desegment = TRUE; #define IDMP_TCP_PORT 1102 /* made up for now - not IANA registered */ static gboolean idmp_reassemble = TRUE; static dissector_handle_t idmp_handle = NULL; static proto_tree *top_tree = NULL; static const char *protocolID = NULL; static const char *saved_protocolID = NULL; static guint32 opcode = -1; /* Initialize the protocol and registered fields */ int proto_idmp = -1; static int hf_idmp_version = -1; static int hf_idmp_final = -1; static int hf_idmp_length = -1; static int hf_idmp_PDU = -1; static reassembly_table idmp_reassembly_table; static int hf_idmp_fragments = -1; static int hf_idmp_fragment = -1; static int hf_idmp_fragment_overlap = -1; static int hf_idmp_fragment_overlap_conflicts = -1; static int hf_idmp_fragment_multiple_tails = -1; static int hf_idmp_fragment_too_long_fragment = -1; static int hf_idmp_fragment_error = -1; static int hf_idmp_fragment_count = -1; static int hf_idmp_reassembled_in = -1; static int hf_idmp_reassembled_length = -1; static int hf_idmp_segment_data = -1; static gint ett_idmp_fragment = -1; static gint ett_idmp_fragments = -1; static const fragment_items idmp_frag_items = { /* Fragment subtrees */ &ett_idmp_fragment, &ett_idmp_fragments, /* Fragment fields */ &hf_idmp_fragments, &hf_idmp_fragment, &hf_idmp_fragment_overlap, &hf_idmp_fragment_overlap_conflicts, &hf_idmp_fragment_multiple_tails, &hf_idmp_fragment_too_long_fragment, &hf_idmp_fragment_error, &hf_idmp_fragment_count, /* Reassembled in field */ &hf_idmp_reassembled_in, /* Reassembled length field */ &hf_idmp_reassembled_length, /* Reassembled data field */ NULL, /* Tag */ "IDMP fragments" }; static int call_idmp_oid_callback(tvbuff_t *tvb, int offset, packet_info *pinfo, int op, proto_tree *tree, struct SESSION_DATA_STRUCTURE *session) { if(session != NULL) { /* XXX saved_protocolID should be part of session data */ if (!saved_protocolID) { saved_protocolID = "[ unknown ]"; } /* mimic ROS! */ session->ros_op = op; offset = call_ros_oid_callback(saved_protocolID, tvb, offset, pinfo, tree, session); } return offset; } #include "packet-idmp-hf.c" /* Initialize the subtree pointers */ static gint ett_idmp = -1; #include "packet-idmp-ett.c" #include "packet-idmp-fn.c" void register_idmp_protocol_info(const char *oid, const ros_info_t *rinfo, int proto _U_, const char *name) { /* just register with ROS for now */ register_ros_protocol_info(oid, rinfo, proto, name, FALSE); } static int dissect_idmp(tvbuff_t *tvb, packet_info *pinfo, proto_tree *parent_tree, void* data _U_) { int offset = 0; proto_item *item; proto_tree *tree; asn1_ctx_t asn1_ctx; struct SESSION_DATA_STRUCTURE session; gboolean idmp_final; guint32 idmp_length; fragment_head *fd_head; conversation_t *conv; guint32 dst_ref = 0; asn1_ctx_init(&asn1_ctx, ASN1_ENC_BER, TRUE, pinfo); conv = find_conversation_pinfo(pinfo, 0); if (conv) { /* Found a conversation, also use index for the generated dst_ref */ dst_ref = conv->conv_index; } /* save parent_tree so subdissectors can create new top nodes */ top_tree=parent_tree; item = proto_tree_add_item(parent_tree, proto_idmp, tvb, 0, -1, ENC_NA); tree = proto_item_add_subtree(item, ett_idmp); col_set_str(pinfo->cinfo, COL_PROTOCOL, "IDMP"); /* now check the segment fields */ proto_tree_add_item(tree, hf_idmp_version, tvb, offset, 1, ENC_BIG_ENDIAN); offset++; proto_tree_add_item(tree, hf_idmp_final, tvb, offset, 1, ENC_BIG_ENDIAN); idmp_final = tvb_get_guint8(tvb, offset); offset++; proto_tree_add_item(tree, hf_idmp_length, tvb, offset, 4, ENC_BIG_ENDIAN); idmp_length = tvb_get_ntohl(tvb, offset); offset += 4; asn1_ctx.private_data = &session; if(idmp_reassemble) { pinfo->fragmented = !idmp_final; col_append_fstr(pinfo->cinfo, COL_INFO, " [%sIDMP fragment, %u byte%s]", idmp_final ? "Final " : "" , idmp_length, plurality(idmp_length, "", "s")); fd_head = fragment_add_seq_next(&idmp_reassembly_table, tvb, offset, pinfo, dst_ref, NULL, idmp_length, !idmp_final); if(fd_head && fd_head->next) { proto_tree_add_item(tree, hf_idmp_segment_data, tvb, offset, (idmp_length) ? -1 : 0, ENC_NA); if (idmp_final) { /* This is the last segment */ tvb = process_reassembled_data (tvb, offset, pinfo, "Reassembled IDMP", fd_head, &idmp_frag_items, NULL, tree); offset = 0; } else if (pinfo->num != fd_head->reassembled_in) { /* Add a "Reassembled in" link if not reassembled in this frame */ proto_tree_add_uint (tree, hf_idmp_reassembled_in, tvb, 0, 0, fd_head->reassembled_in); } } } else { if(!idmp_final) { col_append_fstr(pinfo->cinfo, COL_INFO, " [IDMP fragment, %u byte%s, IDMP reassembly not enabled]", idmp_length, plurality(idmp_length, "", "s")); proto_tree_add_bytes_format_value(tree, hf_idmp_segment_data, tvb, offset, (idmp_length) ? -1 : 0, NULL, "(IDMP reassembly not enabled)"); } } /* not reassembling - just dissect */ if(idmp_final) { asn1_ctx.private_data = &session; dissect_idmp_IDM_PDU(FALSE, tvb, offset, &asn1_ctx, tree, hf_idmp_PDU); } return tvb_captured_length(tvb); } static guint get_idmp_pdu_len(packet_info *pinfo _U_, tvbuff_t *tvb, int offset, void *data _U_) { guint32 len; len = tvb_get_ntohl(tvb, offset + 2); return len + 6; } static int dissect_idmp_tcp(tvbuff_t *tvb, packet_info *pinfo, proto_tree *parent_tree, void* data) { tcp_dissect_pdus(tvb, pinfo, parent_tree, idmp_desegment, 0, get_idmp_pdu_len, dissect_idmp, data); return tvb_captured_length(tvb); } static void idmp_reassemble_cleanup(void) { protocolID = NULL; // packet scoped saved_protocolID = NULL; // epan scoped copy of protocolID opcode = -1; } /*--- proto_register_idmp -------------------------------------------*/ void proto_register_idmp(void) { /* List of fields */ static hf_register_info hf[] = { { &hf_idmp_version, { "version", "idmp.version", FT_INT8, BASE_DEC, NULL, 0, "idmp.INTEGER", HFILL }}, { &hf_idmp_final, { "final", "idmp.final", FT_BOOLEAN, BASE_NONE, NULL, 0, "idmp.BOOLEAN", HFILL }}, { &hf_idmp_length, { "length", "idmp.length", FT_INT32, BASE_DEC, NULL, 0, "idmp.INTEGER", HFILL }}, { &hf_idmp_PDU, { "IDM-PDU", "idmp.pdu", FT_UINT32, BASE_DEC, VALS(idmp_IDM_PDU_vals), 0, "idmp.PDU", HFILL }}, /* Fragment entries */ { &hf_idmp_fragments, { "IDMP fragments", "idmp.fragments", FT_NONE, BASE_NONE, NULL, 0x00, NULL, HFILL } }, { &hf_idmp_fragment, { "IDMP fragment", "idmp.fragment", FT_FRAMENUM, BASE_NONE, NULL, 0x00, NULL, HFILL } }, { &hf_idmp_fragment_overlap, { "IDMP fragment overlap", "idmp.fragment.overlap", FT_BOOLEAN, BASE_NONE, NULL, 0x00, NULL, HFILL } }, { &hf_idmp_fragment_overlap_conflicts, { "IDMP fragment overlapping with conflicting data", "idmp.fragment.overlap.conflicts", FT_BOOLEAN, BASE_NONE, NULL, 0x00, NULL, HFILL } }, { &hf_idmp_fragment_multiple_tails, { "IDMP has multiple tail fragments", "idmp.fragment.multiple_tails", FT_BOOLEAN, BASE_NONE, NULL, 0x00, NULL, HFILL } }, { &hf_idmp_fragment_too_long_fragment, { "IDMP fragment too long", "idmp.fragment.too_long_fragment", FT_BOOLEAN, BASE_NONE, NULL, 0x00, NULL, HFILL } }, { &hf_idmp_fragment_error, { "IDMP defragmentation error", "idmp.fragment.error", FT_FRAMENUM, BASE_NONE, NULL, 0x00, NULL, HFILL } }, { &hf_idmp_fragment_count, { "IDMP fragment count", "idmp.fragment.count", FT_UINT32, BASE_DEC, NULL, 0x00, NULL, HFILL } }, { &hf_idmp_reassembled_in, { "Reassembled IDMP in frame", "idmp.reassembled.in", FT_FRAMENUM, BASE_NONE, NULL, 0x00, "This IDMP packet is reassembled in this frame", HFILL } }, { &hf_idmp_reassembled_length, { "Reassembled IDMP length", "idmp.reassembled.length", FT_UINT32, BASE_DEC, NULL, 0x00, "The total length of the reassembled payload", HFILL } }, { &hf_idmp_segment_data, { "IDMP segment data", "idmp.segment_data", FT_BYTES, BASE_NONE, NULL, 0x00, NULL, HFILL } }, #include "packet-idmp-hfarr.c" }; /* List of subtrees */ static gint *ett[] = { &ett_idmp, &ett_idmp_fragment, &ett_idmp_fragments, #include "packet-idmp-ettarr.c" }; module_t *idmp_module; /* Register protocol */ proto_idmp = proto_register_protocol(PNAME, PSNAME, PFNAME); /* Register fields and subtrees */ proto_register_field_array(proto_idmp, hf, array_length(hf)); proto_register_subtree_array(ett, array_length(ett)); idmp_handle = register_dissector("idmp", dissect_idmp_tcp, proto_idmp); register_cleanup_routine (&idmp_reassemble_cleanup); reassembly_table_register (&idmp_reassembly_table, &addresses_reassembly_table_functions); /* Register our configuration options for IDMP, particularly our port */ idmp_module = prefs_register_protocol_subtree("OSI/X.500", proto_idmp, NULL); prefs_register_bool_preference(idmp_module, "desegment_idmp_messages", "Reassemble IDMP messages spanning multiple TCP segments", "Whether the IDMP 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.", &idmp_desegment); prefs_register_bool_preference(idmp_module, "reassemble", "Reassemble segmented IDMP datagrams", "Whether segmented IDMP datagrams should be reassembled." " To use this option, you must also enable" " \"Allow subdissectors to reassemble TCP streams\"" " in the TCP protocol settings.", &idmp_reassemble); } /*--- proto_reg_handoff_idm --- */ void proto_reg_handoff_idm(void) { dissector_add_uint_with_preference("tcp.port", IDMP_TCP_PORT, idmp_handle); }