Esempio n. 1
0
/*
 * Name: dissect_slow_protocols
 *
 * Description:
 *    This function is used to dissect the slow protocols defined in IEEE802.3
 *    CSMA/CD. The current slow protocols subtypes are define in Annex 57A of
 *    the 802.3 document. In case of an unsupported slow protocol, we only
 *    fill the protocol and info columns.
 *
 * Input Arguments:
 *    tvb:   buffer associated with the rcv packet (see tvbuff.h).
 *    pinfo: structure associated with the rcv packet (see packet_info.h).
 *    tree:  the protocol tree associated with the rcv packet (see proto.h).
 *
 * Return Values:
 *    None
 */
static void
dissect_slow_protocols(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree)
{
    guint8      subtype;
    proto_tree *pdu_tree;
    proto_item *pdu_item;
    tvbuff_t   *next_tvb;

    col_set_str(pinfo->cinfo, COL_PROTOCOL, "Slow Protocols");
    subtype = tvb_get_guint8(tvb, 0);
    col_add_fstr(pinfo->cinfo, COL_INFO, "Subtype = %u", subtype);

    if (tree)
    {
        pdu_item = proto_tree_add_item(tree, proto_slow, tvb, 0, 1, ENC_NA);
        pdu_tree = proto_item_add_subtree(pdu_item, ett_slow);

        /* Subtype */
        proto_tree_add_item(pdu_tree, hf_slow_subtype, tvb, 0, 1, ENC_NA);
    }

    next_tvb = tvb_new_subset_remaining(tvb, 1);
    if (!dissector_try_uint_new(slow_protocols_dissector_table, subtype,
                                next_tvb, pinfo, tree, TRUE, NULL))
        call_dissector(dh_data, next_tvb, pinfo, tree);
}
Esempio n. 2
0
static gint
dissect_hci_h4(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree, void *data)
{
    guint8             type;
    tvbuff_t          *next_tvb;
    proto_item        *main_item;
    proto_tree        *main_tree;
    proto_item        *sub_item;
    bluetooth_data_t  *bluetooth_data;

    bluetooth_data = (bluetooth_data_t *) data;

    col_set_str(pinfo->cinfo, COL_PROTOCOL, "HCI H4");
    switch (pinfo->p2p_dir) {

    case P2P_DIR_SENT:
        col_add_fstr(pinfo->cinfo, COL_INFO, "Sent ");
        break;

    case P2P_DIR_RECV:
        col_add_fstr(pinfo->cinfo, COL_INFO, "Rcvd ");
        break;

    case P2P_DIR_UNKNOWN:
        break;

    default:
        col_add_fstr(pinfo->cinfo, COL_INFO, "Unknown direction %d ",
                pinfo->p2p_dir);
        break;
    }

    type = tvb_get_guint8(tvb, 0);

    main_item = proto_tree_add_item(tree, proto_hci_h4, tvb, 0, 1, ENC_NA);
    main_tree = proto_item_add_subtree(main_item, ett_hci_h4);

    sub_item = proto_tree_add_uint(main_tree, hf_hci_h4_direction, tvb, 0, 0, pinfo->p2p_dir);
    PROTO_ITEM_SET_GENERATED(sub_item);

    proto_tree_add_item(main_tree, hf_hci_h4_type,
        tvb, 0, 1, ENC_LITTLE_ENDIAN);
    col_append_fstr(pinfo->cinfo, COL_INFO, "%s",
            val_to_str(type, hci_h4_type_vals, "Unknown HCI packet type 0x%02x"));

    next_tvb = tvb_new_subset_remaining(tvb, 1);
    if (!dissector_try_uint_new(hci_h4_table, type, next_tvb, pinfo, tree, TRUE, bluetooth_data)) {
        call_dissector(data_handle, next_tvb, pinfo, tree);
    }

    return 1;
}
Esempio n. 3
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static int dissect_ProtocolExtensionFieldExtensionValue(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree)
{
  return (dissector_try_uint_new(rua_extension_dissector_table, ProtocolIE_ID, tvb, pinfo, tree, FALSE)) ? tvb_length(tvb) : 0;
}
Esempio n. 4
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static int dissect_InitiatingMessageValue(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree)
{
  return (dissector_try_uint_new(rua_proc_imsg_dissector_table, ProcedureCode, tvb, pinfo, tree, FALSE)) ? tvb_length(tvb) : 0;
}
Esempio n. 5
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static int dissect_UnsuccessfulOutcomeValue(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree)
{
  return (dissector_try_uint_new(rua_proc_uout_dissector_table, ProcedureCode, tvb, pinfo, tree, FALSE)) ? tvb_length(tvb) : 0;
}
Esempio n. 6
0
static int
dissect_pcap_pktdata(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree, void *data)
{
    gint         offset = 0;
    guint32     *link_type;
    guint32      length = 0;
    tvbuff_t    *next_tvb;
    proto_item  *pseudoheader_item;
    proto_tree  *pseudoheader_tree = NULL;
    proto_item  *packet_item;
    proto_tree  *packet_tree;

    DISSECTOR_ASSERT(data);

    link_type = (guint32 *) data;
    pinfo->phdr->pkt_encap = wtap_pcap_encap_to_wtap_encap(*link_type);

    switch (*link_type) {
    case 139:
/* TODO no description for pseudoheader at http://www.tcpdump.org/linktypes.html */
        break;
    case 196:
        length = 5;
        break;
    case 197:
/* TODO no description for pseudoheader at http://www.tcpdump.org/linktypes.html */
        break;
    case 201:
        length = 4;
        break;
    case 204:
        length = 1;
        break;
    case 205:
        length = 1;
        break;
    case 206:
        length = 1;
        break;
    case 209:
        length = 6;
        break;
    case 226:
        length = 24;
        break;
    case 227:
/* TODO no description for pseudoheader at http://www.tcpdump.org/linktypes.html */
        break;
    case 240:
    case 241:
        length = 4;
        break;
    case 244:
        length = 20;
        break;
    case 245:
        length = 20;
        break;
    }

    if (length > 0) {
        pseudoheader_item = proto_tree_add_item(tree, hf_pcap_pktdata_pseudoheader, tvb, offset, length, ENC_NA);
        pseudoheader_tree = proto_item_add_subtree(pseudoheader_item, ett_pcap_pktdata_pseudoheader);
    }

    switch (*link_type) {
    case 201:
        proto_tree_add_item(pseudoheader_tree, hf_pcap_pktdata_pseudoheader_bluetooth_direction, tvb, offset, 4, ENC_BIG_ENDIAN);
        if (tvb_get_guint32(tvb, offset, ENC_BIG_ENDIAN) == 0)
            pinfo->p2p_dir = P2P_DIR_SENT;
        else if (tvb_get_guint32(tvb, offset, ENC_BIG_ENDIAN) == 1)
            pinfo->p2p_dir = P2P_DIR_RECV;
        else
            pinfo->p2p_dir = P2P_DIR_UNKNOWN;
        offset += 4;
        break;
    default:
        offset += length;
    }

    next_tvb = tvb_new_subset_remaining(tvb, offset);

    packet_item = proto_tree_add_item(tree, hf_pcap_pktdata_data, tvb, offset, tvb_reported_length(next_tvb), ENC_NA);
    packet_tree = proto_item_add_subtree(packet_item, ett_pcap_pktdata_data);

    offset = dissector_try_uint_new(wtap_encap_table, pinfo->phdr->pkt_encap, next_tvb, pinfo, packet_tree, TRUE, NULL);

    return offset;
}
Esempio n. 7
0
static void
dissect_isis(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree)
{
    proto_item *ti, *version_item;
    proto_tree *isis_tree = NULL;
    int offset = 0;
    guint8 isis_version;
    guint8 isis_type;
    tvbuff_t *next_tvb;
    isis_data_t subdissector_data;

    col_set_str(pinfo->cinfo, COL_PROTOCOL, "ISIS");
    col_clear(pinfo->cinfo, COL_INFO);

    ti = proto_tree_add_item(tree, proto_isis, tvb, 0, -1, ENC_NA);
    isis_tree = proto_item_add_subtree(ti, ett_isis);

    proto_tree_add_item(isis_tree, hf_isis_irpd, tvb, offset, 1, ENC_BIG_ENDIAN );
    offset += 1;

    subdissector_data.header_length = tvb_get_guint8(tvb, offset);
    proto_tree_add_uint(isis_tree, hf_isis_header_length, tvb,
            offset, 1, subdissector_data.header_length );
    offset += 1;

    isis_version = tvb_get_guint8(tvb, offset);
    version_item = proto_tree_add_uint(isis_tree, hf_isis_version, tvb,
            offset, 1, isis_version );
    if (isis_version != ISIS_REQUIRED_VERSION){
        col_add_fstr(pinfo->cinfo, COL_INFO,
                "Unknown ISIS version (%u vs %u)",
                isis_version, ISIS_REQUIRED_VERSION );
        expert_add_info(pinfo, version_item, &ei_isis_version);
        return;
    }
    offset += 1;

    subdissector_data.system_id_len = tvb_get_guint8(tvb, offset);
    proto_tree_add_uint(isis_tree, hf_isis_system_id_length, tvb,
            offset, 1, subdissector_data.system_id_len );
    offset += 1;

    isis_type = tvb_get_guint8(tvb, offset) & ISIS_TYPE_MASK;
    col_add_str(pinfo->cinfo, COL_INFO,
            val_to_str ( isis_type, isis_vals, "Unknown (0x%x)" ) );

    proto_tree_add_item(isis_tree, hf_isis_type, tvb, offset, 1, ENC_BIG_ENDIAN );
    proto_tree_add_item(isis_tree, hf_isis_type_reserved, tvb, offset, 1, ENC_BIG_ENDIAN );
    offset += 1;

    proto_tree_add_item(isis_tree, hf_isis_version2, tvb, offset, 1, ENC_BIG_ENDIAN );
    offset += 1;

    proto_tree_add_item(isis_tree, hf_isis_reserved, tvb, offset, 1, ENC_BIG_ENDIAN );
    offset += 1;

    proto_tree_add_item(isis_tree, hf_isis_max_area_adr, tvb, offset, 1, ENC_BIG_ENDIAN );
    offset += 1;

    /*
     * Interpret the system ID length.
     */
    if (subdissector_data.system_id_len == 0)
        subdissector_data.system_id_len = 6;    /* zero means 6-octet ID field length */
    else if (subdissector_data.system_id_len == 255) {
        subdissector_data.system_id_len = 0;    /* 255 means null ID field */
        /* XXX - what about the LAN ID? */
    }
    /* XXX - otherwise, must be in the range 1 through 8 */

    next_tvb = tvb_new_subset_remaining(tvb, offset);
    if (!dissector_try_uint_new(isis_dissector_table, isis_type, next_tvb,
                                pinfo, tree, TRUE, &subdissector_data))
    {
        proto_tree_add_expert(tree, pinfo, &ei_isis_type, tvb, offset, -1);
    }
} /* dissect_isis */
Esempio n. 8
0
static int
dissect_frame(tvbuff_t *tvb, packet_info *pinfo, proto_tree *parent_tree, void* data)
{
	proto_item  *volatile ti = NULL, *comment_item;
	guint	     cap_len = 0, frame_len = 0;
	proto_tree  *volatile tree;
	proto_tree  *comments_tree;
	proto_tree  *volatile fh_tree = NULL;
	proto_item  *item;
	const gchar *cap_plurality, *frame_plurality;
	frame_data_t *fr_data = (frame_data_t*)data;
	const color_filter_t *color_filter;

	tree=parent_tree;

	switch (pinfo->phdr->rec_type) {

	case REC_TYPE_PACKET:
		pinfo->current_proto = "Frame";
		if (pinfo->pseudo_header != NULL) {
			switch (pinfo->pkt_encap) {

			case WTAP_ENCAP_WFLEET_HDLC:
			case WTAP_ENCAP_CHDLC_WITH_PHDR:
			case WTAP_ENCAP_PPP_WITH_PHDR:
			case WTAP_ENCAP_SDLC:
			case WTAP_ENCAP_BLUETOOTH_H4_WITH_PHDR:
				pinfo->p2p_dir = pinfo->pseudo_header->p2p.sent ?
				    P2P_DIR_SENT : P2P_DIR_RECV;
				break;

			case WTAP_ENCAP_BLUETOOTH_HCI:
				pinfo->p2p_dir = pinfo->pseudo_header->bthci.sent;
				break;

			case WTAP_ENCAP_LAPB:
			case WTAP_ENCAP_FRELAY_WITH_PHDR:
				pinfo->p2p_dir =
				    (pinfo->pseudo_header->x25.flags & FROM_DCE) ?
				    P2P_DIR_RECV : P2P_DIR_SENT;
				break;

			case WTAP_ENCAP_ISDN:
			case WTAP_ENCAP_V5_EF:
			case WTAP_ENCAP_DPNSS:
			case WTAP_ENCAP_BACNET_MS_TP_WITH_PHDR:
				pinfo->p2p_dir = pinfo->pseudo_header->isdn.uton ?
				    P2P_DIR_SENT : P2P_DIR_RECV;
				break;

			case WTAP_ENCAP_LINUX_LAPD:
				pinfo->p2p_dir = (pinfo->pseudo_header->lapd.pkttype == 3 ||
					pinfo->pseudo_header->lapd.pkttype == 4) ?
					P2P_DIR_SENT : P2P_DIR_RECV;
				break;

			case WTAP_ENCAP_MTP2_WITH_PHDR:
				pinfo->p2p_dir = pinfo->pseudo_header->mtp2.sent ?
				    P2P_DIR_SENT : P2P_DIR_RECV;
				pinfo->link_number  = pinfo->pseudo_header->mtp2.link_number;
				break;

			case WTAP_ENCAP_GSM_UM:
				pinfo->p2p_dir = pinfo->pseudo_header->gsm_um.uplink ?
				    P2P_DIR_SENT : P2P_DIR_RECV;
				break;
			}
		}
		break;

	case REC_TYPE_FT_SPECIFIC_EVENT:
		pinfo->current_proto = "Event";
		break;

	case REC_TYPE_FT_SPECIFIC_REPORT:
		pinfo->current_proto = "Report";
		break;

	default:
		g_assert_not_reached();
		break;
	}

	if (fr_data && fr_data->pkt_comment) {
		item = proto_tree_add_item(tree, proto_pkt_comment, tvb, 0, 0, ENC_NA);
		comments_tree = proto_item_add_subtree(item, ett_comments);
		comment_item = proto_tree_add_string_format(comments_tree, hf_comments_text, tvb, 0, 0,
							                   fr_data->pkt_comment, "%s",
							                   fr_data->pkt_comment);
		expert_add_info_format(pinfo, comment_item, &ei_comments_text,
					                       "%s",  fr_data->pkt_comment);


	}

	/* if FRAME is not referenced from any filters we don't need to worry about
	   generating any tree items.  */
	if (!proto_field_is_referenced(tree, proto_frame)) {
		tree=NULL;
		if (pinfo->presence_flags & PINFO_HAS_TS) {
			if (pinfo->abs_ts.nsecs < 0 || pinfo->abs_ts.nsecs >= 1000000000)
				expert_add_info(pinfo, NULL, &ei_arrive_time_out_of_range);
		}
	} else {
		gboolean old_visible;

		/* Put in frame header information. */
		cap_len = tvb_captured_length(tvb);
		frame_len = tvb_reported_length(tvb);

		cap_plurality = plurality(cap_len, "", "s");
		frame_plurality = plurality(frame_len, "", "s");

		ti = proto_tree_add_protocol_format(tree, proto_frame, tvb, 0, tvb_captured_length(tvb),
		    "Frame %u: %u byte%s on wire",
		    pinfo->num, frame_len, frame_plurality);
		if (generate_bits_field)
			proto_item_append_text(ti, " (%u bits)", frame_len * 8);
		proto_item_append_text(ti, ", %u byte%s captured",
		    cap_len, cap_plurality);
		if (generate_bits_field) {
			proto_item_append_text(ti, " (%u bits)",
			    cap_len * 8);
		}
		if (pinfo->phdr->presence_flags & WTAP_HAS_INTERFACE_ID) {
			proto_item_append_text(ti, " on interface %u",
			    pinfo->phdr->interface_id);
		}
		if (pinfo->phdr->presence_flags & WTAP_HAS_PACK_FLAGS) {
			if (pinfo->phdr->pack_flags & 0x00000001) {
				proto_item_append_text(ti, " (inbound)");
				pinfo->p2p_dir = P2P_DIR_RECV;
			}
			if (pinfo->phdr->pack_flags & 0x00000002) {
				proto_item_append_text(ti, " (outbound)");
				pinfo->p2p_dir = P2P_DIR_SENT;
			}
		}

		fh_tree = proto_item_add_subtree(ti, ett_frame);

		if (pinfo->phdr->presence_flags & WTAP_HAS_INTERFACE_ID && proto_field_is_referenced(tree, hf_frame_interface_id)) {
			const char *interface_name = epan_get_interface_name(pinfo->epan, pinfo->phdr->interface_id);

			if (interface_name)
				proto_tree_add_uint_format_value(fh_tree, hf_frame_interface_id, tvb, 0, 0, pinfo->phdr->interface_id, "%u (%s)", pinfo->phdr->interface_id, interface_name);
			else
				proto_tree_add_uint(fh_tree, hf_frame_interface_id, tvb, 0, 0, pinfo->phdr->interface_id);
		}

		if (pinfo->phdr->presence_flags & WTAP_HAS_PACK_FLAGS) {
			proto_tree *flags_tree;
			proto_item *flags_item;

			flags_item = proto_tree_add_uint(fh_tree, hf_frame_pack_flags, tvb, 0, 0, pinfo->phdr->pack_flags);
			flags_tree = proto_item_add_subtree(flags_item, ett_flags);
			proto_tree_add_uint(flags_tree, hf_frame_pack_direction, tvb, 0, 0, pinfo->phdr->pack_flags);
			proto_tree_add_uint(flags_tree, hf_frame_pack_reception_type, tvb, 0, 0, pinfo->phdr->pack_flags);
			proto_tree_add_uint(flags_tree, hf_frame_pack_fcs_length, tvb, 0, 0, pinfo->phdr->pack_flags);
			proto_tree_add_uint(flags_tree, hf_frame_pack_reserved, tvb, 0, 0, pinfo->phdr->pack_flags);
			proto_tree_add_boolean(flags_tree, hf_frame_pack_crc_error, tvb, 0, 0, pinfo->phdr->pack_flags);
			proto_tree_add_boolean(flags_tree, hf_frame_pack_wrong_packet_too_long_error, tvb, 0, 0, pinfo->phdr->pack_flags);
			proto_tree_add_boolean(flags_tree, hf_frame_pack_wrong_packet_too_short_error, tvb, 0, 0, pinfo->phdr->pack_flags);
			proto_tree_add_boolean(flags_tree, hf_frame_pack_wrong_inter_frame_gap_error, tvb, 0, 0, pinfo->phdr->pack_flags);
			proto_tree_add_boolean(flags_tree, hf_frame_pack_unaligned_frame_error, tvb, 0, 0, pinfo->phdr->pack_flags);
			proto_tree_add_boolean(flags_tree, hf_frame_pack_start_frame_delimiter_error, tvb, 0, 0, pinfo->phdr->pack_flags);
			proto_tree_add_boolean(flags_tree, hf_frame_pack_preamble_error, tvb, 0, 0, pinfo->phdr->pack_flags);
			proto_tree_add_boolean(flags_tree, hf_frame_pack_symbol_error, tvb, 0, 0, pinfo->phdr->pack_flags);
		}

		if (pinfo->phdr->rec_type == REC_TYPE_PACKET)
			proto_tree_add_int(fh_tree, hf_frame_wtap_encap, tvb, 0, 0, pinfo->pkt_encap);

		if (pinfo->presence_flags & PINFO_HAS_TS) {
			proto_tree_add_time(fh_tree, hf_frame_arrival_time, tvb,
					    0, 0, &(pinfo->abs_ts));
			if (pinfo->abs_ts.nsecs < 0 || pinfo->abs_ts.nsecs >= 1000000000) {
				expert_add_info_format(pinfo, ti, &ei_arrive_time_out_of_range,
								  "Arrival Time: Fractional second %09ld is invalid,"
								  " the valid range is 0-1000000000",
								  (long) pinfo->abs_ts.nsecs);
			}
			item = proto_tree_add_time(fh_tree, hf_frame_shift_offset, tvb,
					    0, 0, &(pinfo->fd->shift_offset));
			PROTO_ITEM_SET_GENERATED(item);

			if (generate_epoch_time) {
				proto_tree_add_time(fh_tree, hf_frame_arrival_time_epoch, tvb,
						    0, 0, &(pinfo->abs_ts));
			}

			if (proto_field_is_referenced(tree, hf_frame_time_delta)) {
				nstime_t     del_cap_ts;

				frame_delta_abs_time(pinfo->epan, pinfo->fd, pinfo->num - 1, &del_cap_ts);

				item = proto_tree_add_time(fh_tree, hf_frame_time_delta, tvb,
							   0, 0, &(del_cap_ts));
				PROTO_ITEM_SET_GENERATED(item);
			}

			if (proto_field_is_referenced(tree, hf_frame_time_delta_displayed)) {
				nstime_t del_dis_ts;

				frame_delta_abs_time(pinfo->epan, pinfo->fd, pinfo->fd->prev_dis_num, &del_dis_ts);

				item = proto_tree_add_time(fh_tree, hf_frame_time_delta_displayed, tvb,
							   0, 0, &(del_dis_ts));
				PROTO_ITEM_SET_GENERATED(item);
			}

			item = proto_tree_add_time(fh_tree, hf_frame_time_relative, tvb,
						   0, 0, &(pinfo->rel_ts));
			PROTO_ITEM_SET_GENERATED(item);

			if (pinfo->fd->flags.ref_time) {
				ti = proto_tree_add_item(fh_tree, hf_frame_time_reference, tvb, 0, 0, ENC_NA);
				PROTO_ITEM_SET_GENERATED(ti);
			}
		}

		proto_tree_add_uint(fh_tree, hf_frame_number, tvb,
				    0, 0, pinfo->num);

		proto_tree_add_uint_format(fh_tree, hf_frame_len, tvb,
					   0, 0, frame_len, "Frame Length: %u byte%s (%u bits)",
					   frame_len, frame_plurality, frame_len * 8);

		proto_tree_add_uint_format(fh_tree, hf_frame_capture_len, tvb,
					   0, 0, cap_len, "Capture Length: %u byte%s (%u bits)",
					   cap_len, cap_plurality, cap_len * 8);

		if (generate_md5_hash) {
			const guint8 *cp;
			md5_state_t   md_ctx;
			md5_byte_t    digest[16];
			const gchar  *digest_string;

			cp = tvb_get_ptr(tvb, 0, cap_len);

			md5_init(&md_ctx);
			md5_append(&md_ctx, cp, cap_len);
			md5_finish(&md_ctx, digest);

			digest_string = bytestring_to_str(wmem_packet_scope(), digest, 16, '\0');
			ti = proto_tree_add_string(fh_tree, hf_frame_md5_hash, tvb, 0, 0, digest_string);
			PROTO_ITEM_SET_GENERATED(ti);
		}

		ti = proto_tree_add_boolean(fh_tree, hf_frame_marked, tvb, 0, 0,pinfo->fd->flags.marked);
		PROTO_ITEM_SET_GENERATED(ti);

		ti = proto_tree_add_boolean(fh_tree, hf_frame_ignored, tvb, 0, 0,pinfo->fd->flags.ignored);
		PROTO_ITEM_SET_GENERATED(ti);

		if (proto_field_is_referenced(tree, hf_frame_protocols)) {
			/* we are going to be using proto_item_append_string() on
			 * hf_frame_protocols, and we must therefore disable the
			 * TRY_TO_FAKE_THIS_ITEM() optimisation for the tree by
			 * setting it as visible.
			 *
			 * See proto.h for details.
			 */
			old_visible = proto_tree_set_visible(fh_tree, TRUE);
			ti = proto_tree_add_string(fh_tree, hf_frame_protocols, tvb, 0, 0, "");
			PROTO_ITEM_SET_GENERATED(ti);
			proto_tree_set_visible(fh_tree, old_visible);
		}

		/* Check for existences of P2P pseudo header */
		if (pinfo->p2p_dir != P2P_DIR_UNKNOWN) {
			proto_tree_add_int(fh_tree, hf_frame_p2p_dir, tvb,
					   0, 0, pinfo->p2p_dir);
		}

		/* Check for existences of MTP2 link number */
		if ((pinfo->pseudo_header != NULL ) && (pinfo->pkt_encap == WTAP_ENCAP_MTP2_WITH_PHDR)) {
			proto_tree_add_uint(fh_tree, hf_link_number, tvb,
					    0, 0, pinfo->link_number);
		}

		if (show_file_off) {
			proto_tree_add_int64_format_value(fh_tree, hf_frame_file_off, tvb,
						    0, 0, pinfo->fd->file_off,
						    "%" G_GINT64_MODIFIER "d (0x%" G_GINT64_MODIFIER "x)",
						    pinfo->fd->file_off, pinfo->fd->file_off);
		}
	}

	if (pinfo->fd->flags.ignored) {
		/* Ignored package, stop handling here */
		col_set_str(pinfo->cinfo, COL_INFO, "<Ignored>");
		proto_tree_add_boolean_format(tree, hf_frame_ignored, tvb, 0, 0, TRUE, "This frame is marked as ignored");
		return tvb_captured_length(tvb);
	}

	/* Portable Exception Handling to trap Wireshark specific exceptions like BoundsError exceptions */
	TRY {
#ifdef _MSC_VER
		/* Win32: Visual-C Structured Exception Handling (SEH) to trap hardware exceptions
		   like memory access violations.
		   (a running debugger will be called before the except part below) */
		/* Note: A Windows "exceptional exception" may leave the kazlib's (Portable Exception Handling)
		   stack in an inconsistent state thus causing a crash at some point in the
		   handling of the exception.
		   See: https://www.wireshark.org/lists/wireshark-dev/200704/msg00243.html
		*/
		__try {
#endif
			switch (pinfo->phdr->rec_type) {

			case REC_TYPE_PACKET:
				if ((force_docsis_encap) && (docsis_handle)) {
					call_dissector_with_data(docsis_handle,
					    tvb, pinfo, parent_tree,
					    (void *)pinfo->pseudo_header);
				} else {
					if (!dissector_try_uint_new(wtap_encap_dissector_table,
					    pinfo->pkt_encap, tvb, pinfo,
					    parent_tree, TRUE,
					    (void *)pinfo->pseudo_header)) {
						col_set_str(pinfo->cinfo, COL_PROTOCOL, "UNKNOWN");
						col_add_fstr(pinfo->cinfo, COL_INFO, "WTAP_ENCAP = %d",
							     pinfo->pkt_encap);
						call_dissector_with_data(data_handle,
						    tvb, pinfo, parent_tree,
						    (void *)pinfo->pseudo_header);
					}
				}
				break;

			case REC_TYPE_FT_SPECIFIC_EVENT:
			case REC_TYPE_FT_SPECIFIC_REPORT:
				{
					int file_type_subtype = WTAP_FILE_TYPE_SUBTYPE_UNKNOWN;

					if (fr_data) {
						file_type_subtype = fr_data->file_type_subtype;
					}

					if (!dissector_try_uint(wtap_fts_rec_dissector_table, file_type_subtype,
					    tvb, pinfo, parent_tree)) {
						col_set_str(pinfo->cinfo, COL_PROTOCOL, "UNKNOWN");
						col_add_fstr(pinfo->cinfo, COL_INFO, "WTAP_ENCAP = %d",
							     file_type_subtype);
						call_dissector(data_handle,tvb, pinfo, parent_tree);
					}
				}
				break;
			}
#ifdef _MSC_VER
		} __except(EXCEPTION_EXECUTE_HANDLER /* handle all exceptions */) {
			switch (GetExceptionCode()) {
			case(STATUS_ACCESS_VIOLATION):
				show_exception(tvb, pinfo, parent_tree, DissectorError,
					       "STATUS_ACCESS_VIOLATION: dissector accessed an invalid memory address");
				break;
			case(STATUS_INTEGER_DIVIDE_BY_ZERO):
				show_exception(tvb, pinfo, parent_tree, DissectorError,
					       "STATUS_INTEGER_DIVIDE_BY_ZERO: dissector tried an integer division by zero");
				break;
			case(STATUS_STACK_OVERFLOW):
				show_exception(tvb, pinfo, parent_tree, DissectorError,
					       "STATUS_STACK_OVERFLOW: dissector overflowed the stack (e.g. endless loop)");
				/* XXX - this will have probably corrupted the stack,
				   which makes problems later in the exception code */
				break;
				/* XXX - add other hardware exception codes as required */
			default:
				show_exception(tvb, pinfo, parent_tree, DissectorError,
					       g_strdup_printf("dissector caused an unknown exception: 0x%x", GetExceptionCode()));
			}
		}
#endif
	}
	CATCH_BOUNDS_AND_DISSECTOR_ERRORS {
		show_exception(tvb, pinfo, parent_tree, EXCEPT_CODE, GET_MESSAGE);
	}
	ENDTRY;

	if (proto_field_is_referenced(tree, hf_frame_protocols)) {
		wmem_strbuf_t *val = wmem_strbuf_sized_new(wmem_packet_scope(), 128, 0);
		wmem_list_frame_t *frame;
		/* skip the first entry, it's always the "frame" protocol */
		frame = wmem_list_frame_next(wmem_list_head(pinfo->layers));
		if (frame) {
			wmem_strbuf_append(val, proto_get_protocol_filter_name(GPOINTER_TO_UINT(wmem_list_frame_data(frame))));
			frame = wmem_list_frame_next(frame);
		}
		while (frame) {
			wmem_strbuf_append_c(val, ':');
			wmem_strbuf_append(val, proto_get_protocol_filter_name(GPOINTER_TO_UINT(wmem_list_frame_data(frame))));
			frame = wmem_list_frame_next(frame);
		}
		proto_item_append_string(ti, wmem_strbuf_get_str(val));
	}

	/*  Call postdissectors if we have any (while trying to avoid another
	 *  TRY/CATCH)
	 */
	if (have_postdissector()) {
		TRY {
#ifdef _MSC_VER
			/* Win32: Visual-C Structured Exception Handling (SEH)
			   to trap hardware exceptions like memory access violations */
			/* (a running debugger will be called before the except part below) */
			/* Note: A Windows "exceptional exception" may leave the kazlib's (Portable Exception Handling)
			   stack in an inconsistent state thus causing a crash at some point in the
			   handling of the exception.
			   See: https://www.wireshark.org/lists/wireshark-dev/200704/msg00243.html
			*/
			__try {
#endif
				call_all_postdissectors(tvb, pinfo, parent_tree);
#ifdef _MSC_VER
			} __except(EXCEPTION_EXECUTE_HANDLER /* handle all exceptions */) {
				switch (GetExceptionCode()) {
				case(STATUS_ACCESS_VIOLATION):
					show_exception(tvb, pinfo, parent_tree, DissectorError,
						       "STATUS_ACCESS_VIOLATION: dissector accessed an invalid memory address");
					break;
				case(STATUS_INTEGER_DIVIDE_BY_ZERO):
					show_exception(tvb, pinfo, parent_tree, DissectorError,
						       "STATUS_INTEGER_DIVIDE_BY_ZERO: dissector tried an integer division by zero");
					break;
				case(STATUS_STACK_OVERFLOW):
					show_exception(tvb, pinfo, parent_tree, DissectorError,
						       "STATUS_STACK_OVERFLOW: dissector overflowed the stack (e.g. endless loop)");
					/* XXX - this will have probably corrupted the stack,
					   which makes problems later in the exception code */
					break;
					/* XXX - add other hardware exception codes as required */
				default:
					show_exception(tvb, pinfo, parent_tree, DissectorError,
						       g_strdup_printf("dissector caused an unknown exception: 0x%x", GetExceptionCode()));
				}
			}
#endif
		}
		CATCH_BOUNDS_AND_DISSECTOR_ERRORS {
			show_exception(tvb, pinfo, parent_tree, EXCEPT_CODE, GET_MESSAGE);
		}
		ENDTRY;
	}

	/* Attempt to (re-)calculate color filters (if any). */
	if (pinfo->fd->flags.need_colorize) {
		color_filter = color_filters_colorize_packet(fr_data->color_edt);
		pinfo->fd->color_filter = color_filter;
		pinfo->fd->flags.need_colorize = 0;
	} else {
		color_filter = pinfo->fd->color_filter;
	}
	if (color_filter) {
		item = proto_tree_add_string(fh_tree, hf_frame_color_filter_name, tvb,
					     0, 0, color_filter->filter_name);
		PROTO_ITEM_SET_GENERATED(item);
		item = proto_tree_add_string(fh_tree, hf_frame_color_filter_text, tvb,
					     0, 0, color_filter->filter_text);
		PROTO_ITEM_SET_GENERATED(item);
	}

	tap_queue_packet(frame_tap, pinfo, NULL);


	if (pinfo->frame_end_routines) {
		g_slist_foreach(pinfo->frame_end_routines, &call_frame_end_routine, NULL);
		g_slist_free(pinfo->frame_end_routines);
		pinfo->frame_end_routines = NULL;
	}

	if (prefs.enable_incomplete_dissectors_check && tree && tree->tree_data->visible) {
		gchar* decoded;
		guint length;
		guint i;
		guint byte;
		guint bit;

		length = tvb_captured_length(tvb);
		decoded = proto_find_undecoded_data(tree, length);

		for (i = 0; i < length; i++) {
			byte = i / 8;
			bit = i % 8;
			if (!(decoded[byte] & (1 << bit))) {
				field_info* fi = proto_find_field_from_offset(tree, i, tvb);
				if (fi && fi->hfinfo->id != proto_frame) {
					g_log(LOG_DOMAIN_CAPTURE, G_LOG_LEVEL_WARNING,
						"Dissector %s incomplete in frame %u: undecoded byte number %u "
						"(0x%.4X+%u)",
						(fi ? fi->hfinfo->abbrev : "[unknown]"),
						pinfo->num, i, i - i % 16, i % 16);
					proto_tree_add_expert_format(tree, pinfo, &ei_incomplete, tvb, i, 1, "Undecoded byte number: %u (0x%.4X+%u)", i, i - i % 16, i % 16);
				}
			}
		}
        }

	return tvb_captured_length(tvb);
}
Esempio n. 9
0
static int dissect_packetlogger(tvbuff_t *tvb, packet_info *pinfo,
        proto_tree *tree, void *data)
{
  proto_tree        *packetlogger_tree = NULL;
  tvbuff_t          *next_tvb;
  proto_item        *ti = NULL;
  guint8             pl_type;
  gint               len;
  bluetooth_data_t  *bluetooth_data;
  struct bthci_phdr  bthci;

  bluetooth_data = (bluetooth_data_t *) data;

  col_set_str (pinfo->cinfo, COL_PROTOCOL, PSNAME);
  col_clear (pinfo->cinfo, COL_INFO);

  ti = proto_tree_add_item (tree, proto_packetlogger, tvb, 0, -1, ENC_NA);
  packetlogger_tree = proto_item_add_subtree (ti, ett_packetlogger);

  pl_type = tvb_get_guint8 (tvb, 0);
  proto_tree_add_item (packetlogger_tree, hf_type, tvb, 0, 1, ENC_BIG_ENDIAN);
  proto_item_append_text (ti, " %s", val_to_str (pl_type, type_vals, "Unknown 0x%02x"));

  len = tvb_reported_length_remaining (tvb, 1);
  next_tvb = tvb_new_subset_remaining (tvb, 1);

  if (pl_type <= PKT_RECV_ACL_DATA) {
    /* HCI H1 packages */
    switch (pl_type) {
    case PKT_HCI_COMMAND:
      bthci.channel = BTHCI_CHANNEL_COMMAND;
      bthci.sent = P2P_DIR_SENT;
      pinfo->p2p_dir = P2P_DIR_SENT;
      break;
    case PKT_HCI_EVENT:
      bthci.channel = BTHCI_CHANNEL_EVENT;
      bthci.sent = P2P_DIR_RECV;
      pinfo->p2p_dir = P2P_DIR_RECV;
      break;
    case PKT_SENT_ACL_DATA:
      bthci.channel = BTHCI_CHANNEL_ACL;
      bthci.sent = P2P_DIR_SENT;
      pinfo->p2p_dir = P2P_DIR_SENT;
      break;
    case PKT_RECV_ACL_DATA:
      bthci.channel = BTHCI_CHANNEL_ACL;
      bthci.sent = P2P_DIR_RECV;
      pinfo->p2p_dir = P2P_DIR_RECV;
      break;
    default:
      bthci.channel = pl_type;
      bthci.sent = P2P_DIR_UNKNOWN;
      pinfo->p2p_dir = P2P_DIR_UNKNOWN;
      break;
    }
    bluetooth_data->previous_protocol_data.bthci = &bthci;
    proto_item_set_len (ti, 1);

    col_add_fstr (pinfo->cinfo, COL_INFO, "%s", val_to_str(pl_type, type_vals, "Unknown 0x%02x"));
    if (!dissector_try_uint_new(hci_h1_table, bthci.channel,
            next_tvb, pinfo, tree, TRUE, bluetooth_data)) {
      call_data_dissector(next_tvb, pinfo, tree);
    }
  } else {
    /* PacketLogger data */
    switch (pl_type) {
    case PKT_POWER:
    case PKT_NOTE:
    case PKT_NEW_CONTROLLER:
      proto_tree_add_item (packetlogger_tree, hf_info, next_tvb, 0, len, ENC_ASCII|ENC_NA);
      col_add_fstr (pinfo->cinfo, COL_INFO, "%s", tvb_format_stringzpad_wsp (next_tvb, 0, len));
      break;
    default:
      call_data_dissector(next_tvb, pinfo, tree);
      col_add_fstr (pinfo->cinfo, COL_INFO, "Unknown 0x%02x", pl_type);
      break;
    }
  }

  return tvb_captured_length(tvb);
}