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Diffstat (limited to 'epan/dissectors/packet-spp.c')
-rw-r--r-- | epan/dissectors/packet-spp.c | 279 |
1 files changed, 279 insertions, 0 deletions
diff --git a/epan/dissectors/packet-spp.c b/epan/dissectors/packet-spp.c new file mode 100644 index 0000000000..0c77fca963 --- /dev/null +++ b/epan/dissectors/packet-spp.c @@ -0,0 +1,279 @@ +/* packet-spp.c + * Routines for XNS SPP + * Based on the Netware SPP dissector by Gilbert Ramirez <gram@alumni.rice.edu> + * + * $Id$ + * + * Ethereal - Network traffic analyzer + * By Gerald Combs <gerald@ethereal.com> + * 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 <glib.h> +#include <epan/packet.h> +#include "packet-idp.h" + +static int proto_spp = -1; +static int hf_spp_connection_control = -1; +static int hf_spp_connection_control_sys = -1; +static int hf_spp_connection_control_send_ack = -1; +static int hf_spp_connection_control_attn = -1; +static int hf_spp_connection_control_eom = -1; +static int hf_spp_datastream_type = -1; +static int hf_spp_src_id = -1; +static int hf_spp_dst_id = -1; +static int hf_spp_seq_nr = -1; +static int hf_spp_ack_nr = -1; +static int hf_spp_all_nr = -1; +static int hf_spp_rexmt_frame = -1; + +static gint ett_spp = -1; +static gint ett_spp_connctrl = -1; + +static dissector_handle_t data_handle; + +/* + * See + * + * "Internet Transport Protocols", XSIS 028112, December 1981 + * + * if you can find it; this is based on the headers in the BSD XNS + * implementation. + */ + +#define SPP_SYS_PACKET 0x80 +#define SPP_SEND_ACK 0x40 +#define SPP_ATTN 0x20 +#define SPP_EOM 0x10 + +static const char* +spp_conn_ctrl(guint8 ctrl) +{ + const char *p; + + static const value_string conn_vals[] = { + { 0x00, "Data, No Ack Required" }, + { SPP_EOM, "End-of-Message" }, + { SPP_ATTN, "Attention" }, + { SPP_SEND_ACK, "Acknowledgment Required"}, + { SPP_SEND_ACK|SPP_EOM, "Send Ack: End Message"}, + { SPP_SYS_PACKET, "System Packet"}, + { SPP_SYS_PACKET|SPP_SEND_ACK, "System Packet: Send Ack"}, + { 0x00, NULL } + }; + + p = match_strval((ctrl & 0xf0), conn_vals ); + + if (p) { + return p; + } + else { + return "Unknown"; + } +} + +static const char* +spp_datastream(guint8 type) +{ + switch (type) { + case 0xfe: + return "End-of-Connection"; + case 0xff: + return "End-of-Connection Acknowledgment"; + default: + return NULL; + } +} + +#define SPP_HEADER_LEN 12 + +/* + * XXX - do reassembly, using the EOM flag. (Then do that in the Netware + * SPX implementation, too.) + * + * XXX - hand off to subdissectors based on the socket number. + */ +static void +dissect_spp(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree) +{ + proto_tree *spp_tree = NULL; + proto_item *ti; + tvbuff_t *next_tvb; + guint8 conn_ctrl; + proto_tree *cc_tree; + guint8 datastream_type; + const char *datastream_type_string; + guint16 spp_seq; + const char *spp_msg_string; + + if (check_col(pinfo->cinfo, COL_PROTOCOL)) + col_set_str(pinfo->cinfo, COL_PROTOCOL, "SPP"); + if (check_col(pinfo->cinfo, COL_INFO)) + col_set_str(pinfo->cinfo, COL_INFO, "SPP"); + + if (tree) { + ti = proto_tree_add_item(tree, proto_spp, tvb, 0, SPP_HEADER_LEN, FALSE); + spp_tree = proto_item_add_subtree(ti, ett_spp); + } + + conn_ctrl = tvb_get_guint8(tvb, 0); + spp_msg_string = spp_conn_ctrl(conn_ctrl); + if (check_col(pinfo->cinfo, COL_INFO)) + col_append_fstr(pinfo->cinfo, COL_INFO, " %s", spp_msg_string); + if (tree) { + ti = proto_tree_add_uint_format(spp_tree, hf_spp_connection_control, tvb, + 0, 1, conn_ctrl, + "Connection Control: %s (0x%02X)", + spp_msg_string, conn_ctrl); + cc_tree = proto_item_add_subtree(ti, ett_spp_connctrl); + proto_tree_add_boolean(cc_tree, hf_spp_connection_control_sys, tvb, + 0, 1, conn_ctrl); + proto_tree_add_boolean(cc_tree, hf_spp_connection_control_send_ack, tvb, + 0, 1, conn_ctrl); + proto_tree_add_boolean(cc_tree, hf_spp_connection_control_attn, tvb, + 0, 1, conn_ctrl); + proto_tree_add_boolean(cc_tree, hf_spp_connection_control_eom, tvb, + 0, 1, conn_ctrl); + } + + datastream_type = tvb_get_guint8(tvb, 1); + datastream_type_string = spp_datastream(datastream_type); + if (datastream_type_string != NULL) { + if (check_col(pinfo->cinfo, COL_INFO)) + col_append_fstr(pinfo->cinfo, COL_INFO, " (%s)", + datastream_type_string); + } + if (tree) { + if (datastream_type_string != NULL) { + proto_tree_add_uint_format(spp_tree, hf_spp_datastream_type, tvb, + 1, 1, datastream_type, + "Datastream Type: %s (0x%02X)", + datastream_type_string, + datastream_type); + } else { + proto_tree_add_uint_format(spp_tree, hf_spp_datastream_type, tvb, + 1, 1, datastream_type, + "Datastream Type: 0x%02X", + datastream_type); + } + proto_tree_add_item(spp_tree, hf_spp_src_id, tvb, 2, 2, FALSE); + proto_tree_add_item(spp_tree, hf_spp_dst_id, tvb, 4, 2, FALSE); + } + spp_seq = tvb_get_ntohs(tvb, 6); + if (tree) { + proto_tree_add_uint(spp_tree, hf_spp_seq_nr, tvb, 6, 2, spp_seq); + proto_tree_add_item(spp_tree, hf_spp_ack_nr, tvb, 8, 2, FALSE); + proto_tree_add_item(spp_tree, hf_spp_all_nr, tvb, 10, 2, FALSE); + } + + if (tvb_reported_length_remaining(tvb, SPP_HEADER_LEN) > 0) { + next_tvb = tvb_new_subset(tvb, SPP_HEADER_LEN, -1, -1); + call_dissector(data_handle, next_tvb, pinfo, tree); + } +} + + +void +proto_register_spp(void) +{ + static hf_register_info hf_spp[] = { + { &hf_spp_connection_control, + { "Connection Control", "spp.ctl", + FT_UINT8, BASE_HEX, NULL, 0x0, + "", HFILL }}, + + { &hf_spp_connection_control_sys, + { "System Packet", "spp.ctl.sys", + FT_BOOLEAN, 8, NULL, SPP_SYS_PACKET, + "", HFILL }}, + + { &hf_spp_connection_control_send_ack, + { "Send Ack", "spp.ctl.send_ack", + FT_BOOLEAN, 8, NULL, SPP_SEND_ACK, + "", HFILL }}, + + { &hf_spp_connection_control_attn, + { "Attention", "spp.ctl.attn", + FT_BOOLEAN, 8, NULL, SPP_ATTN, + "", HFILL }}, + + { &hf_spp_connection_control_eom, + { "End of Message", "spp.ctl.eom", + FT_BOOLEAN, 8, NULL, SPP_EOM, + "", HFILL }}, + + { &hf_spp_datastream_type, + { "Datastream type", "spp.type", + FT_UINT8, BASE_HEX, NULL, 0x0, + "", HFILL }}, + + { &hf_spp_src_id, + { "Source Connection ID", "spp.src", + FT_UINT16, BASE_DEC, NULL, 0x0, + "", HFILL }}, + + { &hf_spp_dst_id, + { "Destination Connection ID", "spp.dst", + FT_UINT16, BASE_DEC, NULL, 0x0, + "", HFILL }}, + + { &hf_spp_seq_nr, + { "Sequence Number", "spp.seq", + FT_UINT16, BASE_DEC, NULL, 0x0, + "", HFILL }}, + + { &hf_spp_ack_nr, + { "Acknowledgment Number", "spp.ack", + FT_UINT16, BASE_DEC, NULL, 0x0, + "", HFILL }}, + + { &hf_spp_all_nr, + { "Allocation Number", "spp.alloc", + FT_UINT16, BASE_DEC, NULL, 0x0, + "", HFILL }}, + + { &hf_spp_rexmt_frame, + { "Retransmitted Frame Number", "spp.rexmt_frame", + FT_FRAMENUM, BASE_NONE, NULL, 0x0, + "", HFILL }}, + }; + + static gint *ett[] = { + &ett_spp, + &ett_spp_connctrl, + }; + + proto_spp = proto_register_protocol("Sequenced Packet Protocol", + "SPP", "spp"); + proto_register_field_array(proto_spp, hf_spp, array_length(hf_spp)); + proto_register_subtree_array(ett, array_length(ett)); +} + +void +proto_reg_handoff_spp(void) +{ + dissector_handle_t spp_handle; + + spp_handle = create_dissector_handle(dissect_spp, proto_spp); + dissector_add("idp.packet_type", IDP_PACKET_TYPE_SPP, spp_handle); + + data_handle = find_dissector("data"); +} |