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-rw-r--r--epan/dissectors/packet-spp.c279
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");
+}
generated by cgit v1.2.3 (git 2.25.1) at 2024-06-13 00:29:07 +0000