/* packet-skinny.c * * Dissector for the Skinny Client Control Protocol * (The "D-Channel"-Protocol for Cisco Systems' IP-Phones) * Copyright 2001, Joerg Mayer (email: see AUTHORS file) * * This file is based on packet-aim.c, which is * Copyright 2000, Ralf Hoelzer * * $Id: packet-skinny.c,v 1.7 2001/12/10 00:25:34 guy Exp $ * * Ethereal - Network traffic analyzer * By Gerald Combs * 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. */ /* This implementation is based on a draft version of the 3.0 * specification */ #ifdef HAVE_CONFIG_H # include "config.h" #endif /* REMOVE? * #include * #include * #include * #include * * #ifdef HAVE_SYS_TYPES_H * # include * #endif * * #ifdef HAVE_NETINET_IN_H * # include * #endif * * #include // already in packet.h -> tvbuff.h * * #ifdef NEED_SNPRINTF_H * # include "snprintf.h" * #endif */ #include "packet.h" /* REMOVE? * #include "strutil.h" */ #define TCP_PORT_SKINNY 2000 /* I will probably need this again when I change things * to function pointers, but let me use the existing * infrastructure for now * * typedef struct { * guint32 id; * char * name; * } message_id_t; */ static const value_string message_id[] = { /* Station -> Callmanager */ {0x0000, "KeepAliveMessage"}, {0x0001, "RegisterMessage"}, {0x0002, "IpPortMessage"}, {0x0003, "KeypadButtonMessage"}, {0x0004, "EnblocCallMessage"}, {0x0005, "StimulusMessage"}, {0x0006, "OffHookMessage"}, {0x0007, "OnHookMessage"}, {0x0008, "HookFlashMessage"}, {0x0009, "ForwardStatReqMessage"}, {0x000A, "SpeedDialStatReqMessage"}, {0x000B, "LineStatReqMessage"}, {0x000C, "ConfigStatReqMessage"}, {0x000D, "TimeDateReqMessage"}, {0x000E, "ButtonTemplateReqMessage"}, {0x000F, "VersionReqMessage"}, {0x0010, "CapabilitiesResMessage"}, {0x0011, "MediaPortListMessage"}, {0x0012, "ServerReqMessage"}, {0x0020, "AlarmMessage"}, {0x0021, "MulticastMediaReceptionAck"}, {0x0022, "OpenReceiveChannelAck"}, {0x0023, "ConnectionStatisticsRes"}, {0x0024, "OffHookWithCgpnMessage"}, {0x0025, "SoftKeySetReqMessage"}, {0x0026, "SoftKeyEventMessage"}, {0x0027, "UnregisterMessage"}, {0x0028, "SoftKeyEventMessage"}, {0x0029, "RegisterTokenReq"}, /* Callmanager -> Station */ /* 0x0000, 0x0003? */ {0x0081, "RegisterAckMessage"}, {0x0082, "StartToneMessage"}, {0x0083, "StopToneMessage"}, {0x0085, "SetRingerMessage"}, {0x0086, "SetLampMessage"}, {0x0087, "SetHkFDetectMessage"}, {0x0088, "SetSpeakerModeMessage"}, {0x0089, "SetMicroModeMessage"}, {0x008A, "StartMediaTransmission"}, {0x008B, "StopMediaTransmission"}, {0x008C, "StartMediaReception"}, {0x008D, "StopMediaReception"}, {0x008F, "CallInfoMessage"}, {0x0090, "ForwardStatMessage"}, {0x0091, "SpeedDialStatMessage"}, {0x0092, "LineStatMessage"}, {0x0093, "ConfigStatMessage"}, {0x0094, "DefineTimeDate"}, {0x0095, "StartSessionTransmission"}, {0x0096, "StopSessionTransmission"}, {0x0097, "ButtonTemplateMessage"}, {0x0098, "VersionMessage"}, {0x0099, "DisplayTextMessage"}, {0x009A, "ClearDisplay"}, {0x009B, "CapabilitiesReqMessage"}, {0x009C, "EnunciatorCommandMessage"}, {0x009D, "RegisterRejectMessage"}, {0x009E, "ServerResMessage"}, {0x009F, "Reset"}, {0x0100, "KeepAliveAckMessage"}, {0x0101, "StartMulticastMediaReception"}, {0x0102, "StartMulticastMediaTransmission"}, {0x0103, "StopMulticastMediaReception"}, {0x0104, "StopMulticastMediaTransmission"}, {0x0105, "OpenReceiveChannel"}, {0x0106, "CloseReceiveChannel"}, {0x0107, "ConnectionStatisticsReq"}, {0x0108, "SoftKeyTemplateResMessage"}, {0x0109, "SoftKeySetResMessage"}, {0x0110, "SelectSoftKeysMessage"}, {0x0111, "CallStateMessage"}, {0x0112, "DisplayPromptStatusMessage"}, {0x0113, "ClearPromptStatusMessage"}, {0x0114, "DisplayNotifyMessage"}, {0x0115, "ClearNotifyMessage"}, {0x0116, "ActivateCallPlaneMessage"}, {0x0117, "DeactivateCallPlaneMessage"}, {0x0118, "UnregisterAckMessage"}, {0x0119, "BackSpaceReqMessage"}, {0x011A, "RegisterTokenAck"}, {0x011B, "RegisterTokenReject"}, {0 , NULL} /* needed for value_string automagic */ }; static void dissect_skinny(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree); /* Initialize the protocol and registered fields */ static int proto_skinny = -1; static int hf_skinny_data_length = -1; static int hf_skinny_reserved = -1; static int hf_skinny_messageid = -1; /* Initialize the subtree pointers */ static gint ett_skinny = -1; static dissector_handle_t data_handle; /* Code to actually dissect the packets */ static void dissect_skinny(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree) { /* The general structure of a packet: {IP-Header|TCP-Header|n*SKINNY} * SKINNY-Packet: {Header(Size, Reserved)|Data(MessageID, Message-Data)} */ /* Header fields */ guint32 hdr_data_length; guint32 hdr_reserved; guint32 data_messageid; gchar *messageid_str; guint32 data_size; /* Set up structures we will need to add the protocol subtree and manage it */ proto_item *ti; proto_tree *skinny_tree = NULL; /* check, if this is really an SKINNY packet, they start with a length + 0 */ /* get relevant header information */ hdr_data_length = tvb_get_letohl(tvb, 0); hdr_reserved = tvb_get_letohl(tvb, 4); data_messageid = tvb_get_letohl(tvb, 8); data_size = MIN(8+hdr_data_length, tvb_length(tvb)) - 0xC; /* hdr_data_length > 1024 is just a heuristic. Better values/checks welcome */ if (hdr_data_length < 4 || hdr_data_length > 1024 || hdr_reserved != 0) { /* Not an SKINNY packet, just happened to use the same port */ call_dissector(data_handle,tvb, pinfo, tree); return; } /* Make entries in Protocol column and Info column on summary display */ if (check_col(pinfo->cinfo, COL_PROTOCOL)) col_set_str(pinfo->cinfo, COL_PROTOCOL, "SKINNY"); if (check_col(pinfo->cinfo, COL_INFO)) col_add_str(pinfo->cinfo, COL_INFO, "Skinny Client Control Protocol"); /* In the interest of speed, if "tree" is NULL, don't do any work not * necessary to generate protocol tree items. */ if (tree) { ti = proto_tree_add_item(tree, proto_skinny, tvb, 0, data_size + 0xC, FALSE); skinny_tree = proto_item_add_subtree(ti, ett_skinny); proto_tree_add_uint(skinny_tree, hf_skinny_data_length, tvb, 0, 4, hdr_data_length); proto_tree_add_uint(skinny_tree, hf_skinny_reserved, tvb, 4, 4, hdr_reserved); } messageid_str = val_to_str(data_messageid, message_id, "0x%08X (Unknown)"); if (check_col(pinfo->cinfo, COL_INFO)) { col_add_str(pinfo->cinfo, COL_INFO, messageid_str); } if (tree) { proto_tree_add_uint(skinny_tree, hf_skinny_messageid, tvb, 8, 4, data_messageid /* FIXME: add messageid_str */ ); if (data_size > 0) { proto_tree_add_protocol_format(skinny_tree, proto_skinny, tvb, 0xC, data_size, "Data (%d byte%s)", data_size, plurality(data_size, "", "s")); } } /*FIXME: call dissect_skinny recursively until all data is used up */ } /* Register the protocol with Ethereal */ void proto_register_skinny(void) { /* Setup list of header fields */ static hf_register_info hf[] = { { &hf_skinny_data_length, { "Data Length", "skinny.data_length", FT_UINT32, BASE_HEX, NULL, 0x0, "Number of bytes in the data portion.", HFILL } }, { &hf_skinny_reserved, { "Reserved", "skinny.reserved", FT_UINT32, BASE_HEX, NULL, 0x0, "Reserved for furture(?) use.", HFILL } }, /* FIXME: Enable use of message name ??? */ { &hf_skinny_messageid, { "Message ID", "skinny.messageid", FT_UINT32, BASE_HEX, VALS(message_id), 0x0, "The function requested/done with this message.", HFILL } }, }; /* Setup protocol subtree array */ static gint *ett[] = { &ett_skinny, }; /* Register the protocol name and description */ proto_skinny = proto_register_protocol("Skinny Client Control Protocol", "SKINNY", "skinny"); /* Required function calls to register the header fields and subtrees used */ proto_register_field_array(proto_skinny, hf, array_length(hf)); proto_register_subtree_array(ett, array_length(ett)); }; void proto_reg_handoff_skinny(void) { dissector_handle_t skinny_handle; data_handle = find_dissector("data"); skinny_handle = create_dissector_handle(dissect_skinny, proto_skinny); dissector_add("tcp.port", TCP_PORT_SKINNY, skinny_handle); }