275 lines
7.3 KiB
C
275 lines
7.3 KiB
C
/* packet-spp.c
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* Routines for XNS SPP
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* Based on the Netware SPX dissector by Gilbert Ramirez <gram@alumni.rice.edu>
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*
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* Wireshark - Network traffic analyzer
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* By Gerald Combs <gerald@wireshark.org>
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* Copyright 1998 Gerald Combs
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*
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* SPDX-License-Identifier: GPL-2.0-or-later
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*/
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#include "config.h"
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#include <epan/packet.h>
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#include "packet-idp.h"
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void proto_register_spp(void);
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void proto_reg_handoff_spp(void);
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static dissector_handle_t spp_handle;
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static int proto_spp = -1;
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static int hf_spp_connection_control = -1;
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static int hf_spp_connection_control_sys = -1;
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static int hf_spp_connection_control_send_ack = -1;
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static int hf_spp_connection_control_attn = -1;
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static int hf_spp_connection_control_eom = -1;
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static int hf_spp_datastream_type = -1;
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static int hf_spp_src_id = -1;
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static int hf_spp_dst_id = -1;
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static int hf_spp_seq_nr = -1;
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static int hf_spp_ack_nr = -1;
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static int hf_spp_all_nr = -1;
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/* static int hf_spp_rexmt_frame = -1; */
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static gint ett_spp = -1;
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static gint ett_spp_connctrl = -1;
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static dissector_table_t spp_socket_dissector_table;
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/*
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* See
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*
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* "Internet Transport Protocols", XSIS 028112, December 1981
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*
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* if you can find it; this is based on the headers in the BSD XNS
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* implementation.
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*/
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#define SPP_SYS_PACKET 0x80
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#define SPP_SEND_ACK 0x40
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#define SPP_ATTN 0x20
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#define SPP_EOM 0x10
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static const char*
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spp_conn_ctrl(guint8 ctrl)
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{
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static const value_string conn_vals[] = {
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{ 0x00, "Data, No Ack Required" },
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{ SPP_EOM, "End-of-Message" },
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{ SPP_ATTN, "Attention" },
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{ SPP_SEND_ACK, "Acknowledgment Required"},
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{ SPP_SEND_ACK|SPP_EOM, "Send Ack: End Message"},
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{ SPP_SYS_PACKET, "System Packet"},
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{ SPP_SYS_PACKET|SPP_SEND_ACK, "System Packet: Send Ack"},
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{ 0x00, NULL }
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};
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return val_to_str_const((ctrl & 0xf0), conn_vals, "Unknown");
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}
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static const char*
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spp_datastream(guint8 type)
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{
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switch (type) {
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case 0xfe:
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return "End-of-Connection";
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case 0xff:
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return "End-of-Connection Acknowledgment";
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default:
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return NULL;
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}
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}
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#define SPP_HEADER_LEN 12
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/*
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* XXX - do reassembly, using the EOM flag. (Then do that in the Netware
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* SPX implementation, too.)
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*
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* XXX - hand off to subdissectors based on the socket number.
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*/
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static int
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dissect_spp(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree, void* data _U_)
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{
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proto_tree *spp_tree;
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proto_item *ti;
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tvbuff_t *next_tvb;
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guint8 conn_ctrl;
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guint8 datastream_type;
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const char *datastream_type_string;
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guint16 spp_seq;
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const char *spp_msg_string;
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guint16 low_socket, high_socket;
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static int * const ctrl[] = {
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&hf_spp_connection_control_sys,
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&hf_spp_connection_control_send_ack,
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&hf_spp_connection_control_attn,
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&hf_spp_connection_control_eom,
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NULL
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};
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col_set_str(pinfo->cinfo, COL_PROTOCOL, "SPP");
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col_set_str(pinfo->cinfo, COL_INFO, "SPP");
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ti = proto_tree_add_item(tree, proto_spp, tvb, 0, SPP_HEADER_LEN, ENC_NA);
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spp_tree = proto_item_add_subtree(ti, ett_spp);
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conn_ctrl = tvb_get_guint8(tvb, 0);
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spp_msg_string = spp_conn_ctrl(conn_ctrl);
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col_append_fstr(pinfo->cinfo, COL_INFO, " %s", spp_msg_string);
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proto_tree_add_bitmask_with_flags(spp_tree, tvb, 0, hf_spp_connection_control, ett_spp_connctrl,
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ctrl, ENC_NA, BMT_NO_FALSE);
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datastream_type = tvb_get_guint8(tvb, 1);
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datastream_type_string = spp_datastream(datastream_type);
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if (datastream_type_string != NULL) {
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col_append_fstr(pinfo->cinfo, COL_INFO, " (%s)", datastream_type_string);
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}
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if (tree) {
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if (datastream_type_string != NULL) {
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proto_tree_add_uint_format_value(spp_tree, hf_spp_datastream_type, tvb,
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1, 1, datastream_type,
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"%s (0x%02X)",
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datastream_type_string,
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datastream_type);
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} else {
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proto_tree_add_uint(spp_tree, hf_spp_datastream_type, tvb,
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1, 1, datastream_type);
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}
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proto_tree_add_item(spp_tree, hf_spp_src_id, tvb, 2, 2, ENC_BIG_ENDIAN);
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proto_tree_add_item(spp_tree, hf_spp_dst_id, tvb, 4, 2, ENC_BIG_ENDIAN);
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}
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spp_seq = tvb_get_ntohs(tvb, 6);
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if (tree) {
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proto_tree_add_uint(spp_tree, hf_spp_seq_nr, tvb, 6, 2, spp_seq);
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proto_tree_add_item(spp_tree, hf_spp_ack_nr, tvb, 8, 2, ENC_BIG_ENDIAN);
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proto_tree_add_item(spp_tree, hf_spp_all_nr, tvb, 10, 2, ENC_BIG_ENDIAN);
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}
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if (tvb_reported_length_remaining(tvb, SPP_HEADER_LEN) > 0) {
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if (pinfo->srcport > pinfo->destport) {
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low_socket = pinfo->destport;
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high_socket = pinfo->srcport;
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} else {
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low_socket = pinfo->srcport;
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high_socket = pinfo->destport;
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}
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next_tvb = tvb_new_subset_remaining(tvb, SPP_HEADER_LEN);
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if (dissector_try_uint(spp_socket_dissector_table, low_socket,
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next_tvb, pinfo, tree))
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return tvb_captured_length(tvb);
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if (dissector_try_uint(spp_socket_dissector_table, high_socket,
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next_tvb, pinfo, tree))
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return tvb_captured_length(tvb);
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call_data_dissector(next_tvb, pinfo, tree);
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}
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return tvb_captured_length(tvb);
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}
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void
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proto_register_spp(void)
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{
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static hf_register_info hf_spp[] = {
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{ &hf_spp_connection_control,
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{ "Connection Control", "spp.ctl",
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FT_UINT8, BASE_HEX, NULL, 0x0,
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NULL, HFILL }},
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{ &hf_spp_connection_control_sys,
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{ "System Packet", "spp.ctl.sys",
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FT_BOOLEAN, 8, NULL, SPP_SYS_PACKET,
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NULL, HFILL }},
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{ &hf_spp_connection_control_send_ack,
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{ "Send Ack", "spp.ctl.send_ack",
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FT_BOOLEAN, 8, NULL, SPP_SEND_ACK,
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NULL, HFILL }},
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{ &hf_spp_connection_control_attn,
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{ "Attention", "spp.ctl.attn",
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FT_BOOLEAN, 8, NULL, SPP_ATTN,
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NULL, HFILL }},
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{ &hf_spp_connection_control_eom,
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{ "End of Message", "spp.ctl.eom",
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FT_BOOLEAN, 8, NULL, SPP_EOM,
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NULL, HFILL }},
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{ &hf_spp_datastream_type,
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{ "Datastream Type", "spp.type",
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FT_UINT8, BASE_HEX, NULL, 0x0,
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NULL, HFILL }},
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{ &hf_spp_src_id,
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{ "Source Connection ID", "spp.src",
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FT_UINT16, BASE_DEC, NULL, 0x0,
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NULL, HFILL }},
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{ &hf_spp_dst_id,
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{ "Destination Connection ID", "spp.dst",
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FT_UINT16, BASE_DEC, NULL, 0x0,
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NULL, HFILL }},
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{ &hf_spp_seq_nr,
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{ "Sequence Number", "spp.seq",
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FT_UINT16, BASE_DEC, NULL, 0x0,
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NULL, HFILL }},
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{ &hf_spp_ack_nr,
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{ "Acknowledgment Number", "spp.ack",
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FT_UINT16, BASE_DEC, NULL, 0x0,
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NULL, HFILL }},
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{ &hf_spp_all_nr,
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{ "Allocation Number", "spp.alloc",
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FT_UINT16, BASE_DEC, NULL, 0x0,
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NULL, HFILL }},
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#if 0
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{ &hf_spp_rexmt_frame,
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{ "Retransmitted Frame Number", "spp.rexmt_frame",
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FT_FRAMENUM, BASE_NONE, NULL, 0x0,
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NULL, HFILL }},
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#endif
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};
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static gint *ett[] = {
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&ett_spp,
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&ett_spp_connctrl,
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};
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proto_spp = proto_register_protocol("Sequenced Packet Protocol",
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"SPP", "spp");
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proto_register_field_array(proto_spp, hf_spp, array_length(hf_spp));
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proto_register_subtree_array(ett, array_length(ett));
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spp_handle = register_dissector("spp", dissect_spp, proto_spp);
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spp_socket_dissector_table = register_dissector_table("spp.socket",
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"SPP socket", proto_spp, FT_UINT16, BASE_HEX);
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}
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void
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proto_reg_handoff_spp(void)
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{
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dissector_add_uint("idp.packet_type", IDP_PACKET_TYPE_SPP, spp_handle);
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}
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/*
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* Editor modelines - https://www.wireshark.org/tools/modelines.html
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*
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* Local variables:
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* c-basic-offset: 8
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* tab-width: 8
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* indent-tabs-mode: t
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* End:
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*
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* vi: set shiftwidth=8 tabstop=8 noexpandtab:
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* :indentSize=8:tabSize=8:noTabs=false:
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*/
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