/* packet-megaco.c * Routines for megaco packet disassembly * RFC 3015 * * $Id$ * * Christian Falckenberg, 2002/10/17 * Copyright (c) 2002 by Christian Falckenberg * * * Christoph Wiest, 2003/06/28 * Modified 2003 by Christoph Wiest * * Modifyed 2004 by Anders Broman * * To handle TPKT headers if over TCP * * Ethereal - Network traffic analyzer * By Gerald Combs * Copyright 1999 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 "plugins/plugin_api.h" #include "moduleinfo.h" #include #include #include #include #include #include #include #include #include #include #include "sctpppids.h" #include #include "plugins/plugin_api_defs.h" #ifndef ENABLE_STATIC G_MODULE_EXPORT const gchar version[] = VERSION; #endif #define PORT_MEGACO_TXT 2944 #define PORT_MEGACO_BIN 2945 void proto_reg_handoff_megaco(void); /* Define the megaco proto */ static int proto_megaco = -1; /* Define headers for megaco */ static int hf_megaco_version = -1; static int hf_megaco_transaction = -1; static int hf_megaco_transid = -1; static int hf_megaco_Context = -1; static int hf_megaco_command_line = -1; static int hf_megaco_command = -1; static int hf_megaco_termid = -1; /* Define headers in subtree for megaco */ static int hf_megaco_modem_descriptor = -1; static int hf_megaco_multiplex_descriptor = -1; static int hf_megaco_media_descriptor = -1; static int hf_megaco_events_descriptor = -1; static int hf_megaco_signal_descriptor = -1; static int hf_megaco_audit_descriptor = -1; static int hf_megaco_servicechange_descriptor = -1; static int hf_megaco_digitmap_descriptor = -1; static int hf_megaco_statistics_descriptor = -1; static int hf_megaco_observedevents_descriptor = -1; static int hf_megaco_topology_descriptor = -1; static int hf_megaco_error_descriptor = -1; static int hf_megaco_TerminationState_descriptor= -1; static int hf_megaco_Remote_descriptor = -1; static int hf_megaco_Local_descriptor = -1; static int hf_megaco_LocalControl_descriptor = -1; static int hf_megaco_packages_descriptor = -1; static int hf_megaco_error_Frame = -1; static int hf_megaco_Service_State = -1; static int hf_megaco_Event_Buffer_Control = -1; static int hf_megaco_mode = -1; static int hf_megaco_reserve_group = -1; static int hf_megaco_reserve_value = -1; static int hf_megaco_streamid = -1; static int hf_megaco_requestid = -1; static int hf_megaco_pkgdname = -1; static int hf_megaco_mId = -1; static int hf_megaco_h245 = -1; /* Define the trees for megaco */ static int ett_megaco = -1; static int ett_megaco_command_line = -1; static int ett_megaco_mediadescriptor = -1; static int ett_megaco_descriptors = -1; static int ett_megaco_TerminationState = -1; static int ett_megaco_Localdescriptor = -1; static int ett_megaco_Remotedescriptor = -1; static int ett_megaco_LocalControldescriptor = -1; static int ett_megaco_auditdescriptor = -1; static int ett_megaco_eventsdescriptor = -1; static int ett_megaco_observedeventsdescriptor = -1; static int ett_megaco_observedevent = -1; static int ett_megaco_packagesdescriptor = -1; static int ett_megaco_requestedevent = -1; static int ett_megaco_signalsdescriptor = -1; static int ett_megaco_requestedsignal = -1; static int ett_megaco_h245 = -1; static dissector_handle_t megaco_text_handle; /* * Here are the global variables associated with * the various user definable characteristics of the dissection * * MEGACO has two kinds of message formats: text and binary * * global_megaco_raw_text determines whether we are going to display * the raw text of the megaco message, much like the HTTP dissector does. * * global_megaco_dissect_tree determines whether we are going to display * a detailed tree that expresses a somewhat more semantically meaningful * decode. */ static int global_megaco_txt_tcp_port = PORT_MEGACO_TXT; static int global_megaco_txt_udp_port = PORT_MEGACO_TXT; #if 0 static int global_megaco_bin_tcp_port = PORT_MEGACO_BIN; static int global_megaco_bin_udp_port = PORT_MEGACO_BIN; #endif static gboolean global_megaco_raw_text = TRUE; static gboolean global_megaco_dissect_tree = TRUE; /* * Variables to allow for proper deletion of dissector registration when * the user changes port from the gui. */ static int txt_tcp_port = 0; static int txt_udp_port = 0; #if 0 static int bin_tcp_port = 0; static int bin_udp_port = 0; #endif /* Some basic utility functions that are specific to this dissector */ static gint tvb_skip_wsp(tvbuff_t* tvb, gint offset); static gint tvb_skip_wsp_return(tvbuff_t* tvb, gint offset); /* * The various functions that either dissect some * subpart of MEGACO. These aren't really proto dissectors but they * are written in the same style. * */ static void dissect_megaco_descriptors(tvbuff_t *tvb, proto_tree *tree, packet_info *pinfo, gint tvb_descriptors_start_offset, gint tvb_descriptors_end_offset); static void dissect_megaco_modemdescriptor(tvbuff_t *tvb, proto_tree *tree, gint tvb_RBRKT, gint tvb_previous_offset); static void dissect_megaco_multiplexdescriptor(tvbuff_t *tvb, proto_tree *tree, gint tvb_RBRKT, gint tvb_previous_offset); static void dissect_megaco_mediadescriptor(tvbuff_t *tvb, proto_tree *tree,packet_info *pinfo, gint tvb_RBRKT, gint tvb_previous_offset); static void dissect_megaco_eventsdescriptor(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree, gint tvb_RBRKT, gint tvb_previous_offset); static void dissect_megaco_signaldescriptor(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree, gint tvb_RBRKT, gint tvb_previous_offset); static void dissect_megaco_auditdescriptor(tvbuff_t *tvb, proto_tree *tree,packet_info *pinfo, gint tvb_RBRKT, gint tvb_previous_offset); static void dissect_megaco_servicechangedescriptor(tvbuff_t *tvb, proto_tree *tree, gint tvb_RBRKT, gint tvb_previous_offset); static void dissect_megaco_digitmapdescriptor(tvbuff_t *tvb, proto_tree *tree, gint tvb_RBRKT, gint tvb_previous_offset); static void dissect_megaco_statisticsdescriptor(tvbuff_t *tvb, proto_tree *tree, gint tvb_RBRKT, gint tvb_previous_offset); static void dissect_megaco_observedeventsdescriptor(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree, gint tvb_RBRKT, gint tvb_previous_offset); static void dissect_megaco_topologydescriptor(tvbuff_t *tvb, proto_tree *tree, gint tvb_RBRKT, gint tvb_previous_offset); static void dissect_megaco_errordescriptor(tvbuff_t *tvb, proto_tree *tree, gint tvb_RBRKT, gint tvb_previous_offset); static void dissect_megaco_TerminationStatedescriptor(tvbuff_t *tvb, proto_tree *tree, gint tvb_next_offset, gint tvb_current_offset); static void dissect_megaco_Localdescriptor(tvbuff_t *tvb, proto_tree *tree, packet_info *pinfo, gint tvb_next_offset, gint tvb_current_offset); static void dissect_megaco_Remotedescriptor(tvbuff_t *tvb, proto_tree *tree, packet_info *pinfo, gint tvb_next_offset, gint tvb_current_offset); static void dissect_megaco_LocalControldescriptor(tvbuff_t *tvb, proto_tree *tree, gint tvb_next_offset, gint tvb_current_offset); static void dissect_megaco_Packagesdescriptor(tvbuff_t *tvb, proto_tree *tree, gint tvb_next_offset, gint tvb_current_offset); static void tvb_raw_text_add(tvbuff_t *tvb, proto_tree *tree); static void dissect_megaco_text(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree); static dissector_handle_t sdp_handle; static dissector_handle_t h245_handle; static proto_tree *top_tree; /* * dissect_megaco_text over TCP, there will be a TPKT header there * */ static void dissect_megaco_text_tcp(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree) { int lv_tpkt_len; /* This code is copied from the Q.931 dissector, some parts skipped. * Check whether this looks like a TPKT-encapsulated * MEGACO packet. * * The minimum length of a MEGACO message is 6?: * Re-assembly ? */ lv_tpkt_len = is_tpkt(tvb, 6); if (lv_tpkt_len == -1) { /* * It's not a TPKT packet; * Is in MEGACO ? */ dissect_megaco_text(tvb, pinfo, tree); } dissect_tpkt_encap(tvb, pinfo, tree, TRUE, megaco_text_handle); } /* * dissect_megaco_text - The dissector for the MEGACO Protocol, using * text encoding. */ static void dissect_megaco_text(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree) { gint tvb_len, len; gint tvb_offset,tvb_current_offset,tvb_previous_offset,tvb_next_offset,tokenlen; gint tvb_command_start_offset, tvb_command_end_offset; gint tvb_descriptors_start_offset, tvb_descriptors_end_offset; proto_tree *megaco_tree, *megaco_tree_command_line, *ti, *sub_ti; proto_item* (*my_proto_tree_add_string)(proto_tree*, int, tvbuff_t*, gint, gint, const char*); guint8 word[7]; guint8 transaction[30]; guint8 TermID[30]; guint8 tempchar; gint tvb_RBRKT, tvb_LBRKT, RBRKT_counter, LBRKT_counter; top_tree=tree; /* Initialize variables */ tvb_len = tvb_length(tvb); megaco_tree = NULL; ti = NULL; tvb_previous_offset = 0; tvb_current_offset = 0; tvb_offset = 0; tvb_next_offset = 0; tvb_command_start_offset = 0; tvb_command_end_offset = 0; tvb_RBRKT = 0; tvb_LBRKT = 0; RBRKT_counter = 0; LBRKT_counter = 0; /* * Check to see whether we're really dealing with MEGACO by looking * for the "MEGACO" string or a "!".This needs to be improved when supporting * binary encodings. Bugfix add skipping of leading spaces. */ tvb_offset = tvb_skip_wsp(tvb, tvb_offset); /* Quick fix for MEGACO not following the RFC, hopfully not breaking any thing * Turned out to be TPKT in case of TCP, added some code to handle that. * * tvb_offset = tvb_find_guint8(tvb, tvb_offset, 5, 'M'); */ if(!tvb_get_nstringz0(tvb,tvb_offset,sizeof(word),word)) return; if (strncasecmp(word, "MEGACO", 6) != 0 && tvb_get_guint8(tvb, tvb_offset ) != '!'){ return; } /* Display MEGACO in protocol column */ if (check_col(pinfo->cinfo, COL_PROTOCOL)) col_add_str(pinfo->cinfo, COL_PROTOCOL, "MEGACO"); /* Build the info tree if we've been given a root */ if (tree){ /* Create megaco subtree */ ti = proto_tree_add_item(tree,proto_megaco,tvb, 0, -1, FALSE); megaco_tree = proto_item_add_subtree(ti, ett_megaco); } if(global_megaco_dissect_tree) my_proto_tree_add_string = proto_tree_add_string; else my_proto_tree_add_string = proto_tree_add_string_hidden; /* Format of 'message' is = MegacopToken SLASH Version SEP mId SEP messageBody */ /* MegacopToken = "MEGACO" or "!" */ /* According to H248.1-200205 Annex B Text encoding ( protocol version 2 ) */ /* Find version */ tvb_previous_offset = tvb_find_guint8(tvb, 0, tvb_len, '/'); if (tvb_previous_offset == -1) { proto_tree_add_text(megaco_tree, tvb, 0, -1, "Sorry, no \"/\" in the MEGACO header, I can't parse this packet"); return; } tvb_previous_offset = tvb_previous_offset + 1; /* As version should follow /, just add 1, works till ver 9 */ tvb_current_offset = tvb_previous_offset + 1; tokenlen = tvb_current_offset - tvb_previous_offset; if (tree) my_proto_tree_add_string(megaco_tree, hf_megaco_version, tvb, tvb_previous_offset, tokenlen, tvb_format_text(tvb, tvb_previous_offset, tokenlen)); /* Pos of version + 2 should take us past version + SEP */ tvb_previous_offset = tvb_previous_offset + 2; /* in case of CRLF */ if (tvb_get_guint8(tvb, tvb_current_offset ) == '\n') tvb_previous_offset++; if (tvb_get_guint8(tvb, tvb_current_offset ) == '\r') tvb_previous_offset++; /* mId should follow here, */ /* mId = (( domainAddress / domainName ) [":" portNumber]) / mtpAddress / deviceName */ /* domainAddress = "[" (IPv4address / IPv6address) "]" */ /* domainName = "<" (ALPHA / DIGIT) *63(ALPHA / DIGIT / "-" /".") ">" */ /* mtpAddress = MTPToken LBRKT 4*8 (HEXDIG) RBRKT */ /* MTPToken = ("MTP") */ /* deviceName = pathNAME */ /* pathNAME = ["*"] NAME *("/" / "*"/ ALPHA / DIGIT /"_" / "$" )["@" pathDomainName ] */ tokenlen = tvb_find_line_end( tvb, tvb_previous_offset, -1, &tvb_next_offset, FALSE); /* Att this point we should point to the "\n" ending the mId element */ if (tree) my_proto_tree_add_string(megaco_tree, hf_megaco_mId, tvb, tvb_previous_offset, tokenlen, tvb_format_text(tvb, tvb_previous_offset, tokenlen)); tvb_previous_offset = tvb_next_offset; /* Next part is */ /* : messageBody = ( errorDescriptor / transactionList ) */ /* errorDescriptor = ErrorToken EQUAL ErrorCode LBRKT [quotedString] RBRKT */ /* ErrorToken = ("Error" / "ER") */ /* transactionList = 1*( transactionRequest / transactionReply / */ /* transactionPending / transactionResponseAck ) */ /* transactionResponseAck = ResponseAckToken LBRKT */ /* transactionAck*(COMMA transactionAck) RBRKT */ /* ResponseAckToken = ("TransactionResponseAck"/ "K") */ /* transactionPending = PendingToken EQUAL TransactionID LBRKT RBRKT */ /* PendingToken = ("Pending" / "PN") */ /* transactionReply = ReplyToken EQUAL TransactionID LBRKT */ /* [ ImmAckRequiredToken COMMA]( errorDescriptor / actionReplyList ) RBRKT */ /* ReplyToken = ("Reply" / "P") */ /* transactionRequest = TransToken EQUAL TransactionID LBRKT */ /* actionRequest *(COMMA actionRequest) RBRKT */ /* TransToken = ("Transaction" / "T") */ tempchar = tvb_get_guint8(tvb, tvb_previous_offset ); switch ( tempchar ){ /* errorDescriptor */ case 'E': if (check_col(pinfo->cinfo, COL_INFO) ) col_add_fstr(pinfo->cinfo, COL_INFO, "Error"); tokenlen = tvb_len - tvb_previous_offset; if (tree) { my_proto_tree_add_string(megaco_tree, hf_megaco_transaction, tvb, tvb_previous_offset, tokenlen, "Error" ); tvb_command_start_offset = tvb_previous_offset; dissect_megaco_errordescriptor(tvb, megaco_tree, tvb_len-1, tvb_command_start_offset); } return; break; /* transactionResponseAck */ case 'K': tvb_offset = tvb_find_guint8(tvb, tvb_offset, tvb_len, '{'); tokenlen = tvb_offset - tvb_previous_offset; my_proto_tree_add_string(megaco_tree, hf_megaco_transaction, tvb, tvb_previous_offset, tokenlen, "TransactionResponseAck" ); tvb_previous_offset = tvb_skip_wsp(tvb, tvb_offset+1); len = tvb_len - tvb_previous_offset - 2; if (check_col(pinfo->cinfo, COL_INFO) ) col_add_fstr(pinfo->cinfo, COL_INFO, "%s TransactionResponseAck", tvb_format_text(tvb,tvb_previous_offset,len)); if(tree) my_proto_tree_add_string(megaco_tree, hf_megaco_transid, tvb, tvb_previous_offset, len, tvb_format_text(tvb,tvb_previous_offset,len)); if(global_megaco_raw_text){ tvb_raw_text_add(tvb, megaco_tree); } return; break; /* Pe and PN is transactionPending, P+"any char" is transactionReply */ case 'P': tempchar = tvb_get_guint8(tvb, tvb_previous_offset + 1 ); switch ( tempchar ){ case 'e': tokenlen = 7; if (tree) my_proto_tree_add_string(megaco_tree, hf_megaco_transaction, tvb, tvb_previous_offset, tokenlen, "Pending" ); tvb_offset = tvb_find_guint8(tvb, tvb_previous_offset, tvb_len, '=')+1; tvb_previous_offset = tvb_skip_wsp(tvb, tvb_offset); len = tvb_len - tvb_offset - 2; if (check_col(pinfo->cinfo, COL_INFO) ) col_add_fstr(pinfo->cinfo, COL_INFO, "%s Pending", tvb_format_text(tvb,tvb_offset,len)); if(tree) my_proto_tree_add_string(megaco_tree, hf_megaco_transid, tvb, tvb_previous_offset, tokenlen, tvb_format_text(tvb,tvb_offset,len)); return; break; case 'N': tokenlen = 2; if (tree) my_proto_tree_add_string(megaco_tree, hf_megaco_transaction, tvb, tvb_previous_offset, tokenlen, "Pending" ); tvb_offset = tvb_find_guint8(tvb, tvb_previous_offset, tvb_len, '=')+1; len = tvb_len - tvb_offset - 2; if (check_col(pinfo->cinfo, COL_INFO) ) col_add_fstr(pinfo->cinfo, COL_INFO, "%s Pending", tvb_format_text(tvb,tvb_offset,len)); if(tree) my_proto_tree_add_string(megaco_tree, hf_megaco_transid, tvb, tvb_previous_offset, tokenlen, tvb_format_text(tvb,tvb_offset,len)); return; break; /* Reply */ default : tokenlen = 1; if (tree) my_proto_tree_add_string(megaco_tree, hf_megaco_transaction, tvb, tvb_previous_offset, tokenlen, "Reply" ); tvb_offset = tvb_find_guint8(tvb, tvb_previous_offset, tvb_len, '=')+1; tvb_offset = tvb_skip_wsp(tvb, tvb_offset); tvb_current_offset = tvb_find_guint8(tvb, tvb_offset, tvb_len, '{'); tvb_current_offset = tvb_skip_wsp_return(tvb, tvb_current_offset-1); len = tvb_current_offset - tvb_offset; if (check_col(pinfo->cinfo, COL_INFO) ) col_add_fstr(pinfo->cinfo, COL_INFO, "%s Reply", tvb_format_text(tvb,tvb_offset,len)); if(tree) my_proto_tree_add_string(megaco_tree, hf_megaco_transid, tvb, tvb_offset, len, tvb_format_text(tvb,tvb_offset,len)); break; }/* end switch */ break; /* Case 'P' */ /* transactionReply */ case 'R': tokenlen = 5; if (tree) my_proto_tree_add_string(megaco_tree, hf_megaco_transaction, tvb, tvb_previous_offset, tokenlen, "Reply" ); tvb_offset = tvb_find_guint8(tvb, tvb_previous_offset, tvb_len, '=')+1; tvb_offset = tvb_skip_wsp(tvb, tvb_offset); tvb_current_offset = tvb_find_guint8(tvb, tvb_offset, tvb_len, '{'); tvb_current_offset = tvb_skip_wsp_return(tvb, tvb_current_offset-1); len = tvb_current_offset - tvb_offset; if (check_col(pinfo->cinfo, COL_INFO) ) col_add_fstr(pinfo->cinfo, COL_INFO, "%s Reply", tvb_format_text(tvb,tvb_offset,len)); if(tree) my_proto_tree_add_string(megaco_tree, hf_megaco_transid, tvb, tvb_offset, len, tvb_format_text(tvb,tvb_offset,len)); break; /* TransactionRequest or TransactionResponseAck */ case 'T': tokenlen = 1; if (tvb_get_guint8(tvb, tvb_previous_offset + 1 )!= 'r' ) { /* TransactionRequest short notation */ } else{ /* TransactionRequest or TransactionResponseAck */ len = 22; /* TransactionResponseAck is 22 characters */ tokenlen = 11; tvb_get_nstringz0(tvb,tvb_previous_offset,len+1,transaction); if ( transaction[19] == 'A'){ tvb_offset = tvb_find_guint8(tvb, tvb_offset, tvb_len, '{')+1; tvb_offset = tvb_skip_wsp(tvb, tvb_offset); tvb_next_offset = tvb_find_guint8(tvb, tvb_offset, tvb_len, '}') - 1; tvb_next_offset = tvb_skip_wsp_return(tvb, tvb_next_offset); len = tvb_next_offset - tvb_offset; if (check_col(pinfo->cinfo, COL_INFO) ) col_add_fstr(pinfo->cinfo, COL_INFO, "%s TransactionResponseAck", tvb_format_text(tvb,tvb_offset,len)); if(tree) len = tvb_len - tvb_previous_offset; proto_tree_add_text(megaco_tree, tvb, tvb_previous_offset, -1, "%s",tvb_format_text(tvb, tvb_previous_offset, len)); if(global_megaco_raw_text){ tvb_raw_text_add(tvb, megaco_tree); } return; break; } }/* else */ /* TransactionRequest */ if(tree) my_proto_tree_add_string(megaco_tree, hf_megaco_transaction, tvb, tvb_previous_offset, tokenlen, "Request" ); tvb_offset = tvb_find_guint8(tvb, tvb_offset, tvb_len, '=')+1; tvb_offset = tvb_skip_wsp(tvb, tvb_offset); tvb_current_offset = tvb_find_guint8(tvb, tvb_offset, tvb_len, '{'); tvb_current_offset = tvb_skip_wsp_return(tvb, tvb_current_offset-1); len = tvb_current_offset - tvb_offset; if (check_col(pinfo->cinfo, COL_INFO) ) col_add_fstr(pinfo->cinfo, COL_INFO, "%s Request", tvb_format_text(tvb,tvb_offset,len)); if(tree) my_proto_tree_add_string(megaco_tree, hf_megaco_transid, tvb, tvb_offset,len, tvb_format_text(tvb,tvb_offset,len)); break; default : ti = proto_tree_add_item(tree,proto_megaco,tvb, 0, -1, FALSE); megaco_tree = proto_item_add_subtree(ti, ett_megaco); proto_tree_add_text(megaco_tree, tvb, 0, -1, "Sorry, can't understand errorDescriptor / transactionList = %s, can't parse it pos %u", tvb_format_text(tvb,tvb_previous_offset,2),tvb_previous_offset); return; break; } /* end switch */ /* Only these remains now */ /* transactionReply = ReplyToken EQUAL TransactionID LBRKT */ /* [ ImmAckRequiredToken COMMA]( errorDescriptor / actionReplyList ) RBRKT */ /* ReplyToken = ("Reply" / "P") */ /* transactionRequest = TransToken EQUAL TransactionID LBRKT */ /* actionRequest *(COMMA actionRequest) RBRKT */ /* TransToken = ("Transaction" / "T") */ /* Ready to here etxrab */ if(tree) { /* Only do the rest if tree built */ /* Find Context */ nextcontext: tvb_previous_offset = tvb_find_guint8(tvb, tvb_current_offset, tvb_len, '=')+1; tvb_previous_offset = tvb_skip_wsp(tvb, tvb_previous_offset); tvb_current_offset = tvb_find_guint8(tvb, tvb_previous_offset, tvb_len, '{'); tokenlen = tvb_current_offset - tvb_previous_offset; tempchar = tvb_get_guint8(tvb, tvb_previous_offset ); if (tvb_get_guint8(tvb, tvb_current_offset-1 ) == ' '){ tokenlen--; } switch ( tempchar ){ case '$': my_proto_tree_add_string(megaco_tree, hf_megaco_Context, tvb, tvb_previous_offset, 1, "Choose one"); break; case '*': my_proto_tree_add_string(megaco_tree, hf_megaco_Context, tvb, tvb_previous_offset, 1, "All"); break; case '-': proto_tree_add_text(megaco_tree, tvb, tvb_previous_offset, tokenlen, "Context: NULL" ); break; default: my_proto_tree_add_string(megaco_tree, hf_megaco_Context, tvb, tvb_previous_offset, tokenlen, tvb_format_text(tvb, tvb_previous_offset, tokenlen)); } /* Find Commands */ /* If transaction is ERROR the plugin will call the ERROR subroutine */ if ( transaction[0] == 'E'){ tvb_offset = tvb_find_guint8(tvb, 0, tvb_len, '/'); tvb_command_start_offset = tvb_find_guint8(tvb, tvb_offset, tvb_len, 'E'); dissect_megaco_errordescriptor(tvb, megaco_tree, tvb_len-1, tvb_command_start_offset); return; } else{ /* If Transaction is is Request, Reply or Pending */ tvb_command_start_offset = tvb_skip_wsp(tvb, tvb_current_offset +1); tvb_command_end_offset = tvb_command_start_offset; tvb_LBRKT = tvb_command_start_offset; tvb_RBRKT = tvb_command_start_offset; } /* The following loop find the individual contexts, commands and call the for every Descriptor a subroutine */ do { tvb_command_end_offset = tvb_find_guint8(tvb, tvb_command_end_offset +1, tvb_len, ','); if ( tvb_command_end_offset == -1 ){ tvb_command_end_offset = tvb_len; } /* checking how many left brackets are before the next comma */ while ( tvb_find_guint8(tvb, tvb_LBRKT+1,tvb_len, '{') != -1 && (tvb_find_guint8(tvb, tvb_LBRKT+1,tvb_len, '{') < tvb_command_end_offset)){ tvb_LBRKT = tvb_find_guint8(tvb, tvb_LBRKT+1, tvb_len, '{'); LBRKT_counter++; } /* checking how many right brackets are before the next comma */ while ( (tvb_find_guint8(tvb, tvb_RBRKT+1,tvb_len, '}') != -1 ) && (tvb_find_guint8(tvb, tvb_RBRKT+1,tvb_len, '}') < tvb_command_end_offset) && LBRKT_counter != 0){ tvb_RBRKT = tvb_find_guint8(tvb, tvb_RBRKT+1, tvb_len, '}'); RBRKT_counter++; } /* If equal or more right brackets before the comma, one command is complete */ if ( LBRKT_counter <= RBRKT_counter ){ tvb_current_offset = tvb_find_guint8(tvb, tvb_command_start_offset, tvb_len, '{'); /* includes no descriptors */ if ( LBRKT_counter == 0 ){ tvb_current_offset = tvb_command_end_offset; /* the last command in a context */ if ( tvb_find_guint8(tvb, tvb_command_start_offset, tvb_len, '}') < tvb_current_offset && tvb_find_guint8(tvb, tvb_command_start_offset, tvb_len, '}') != -1){ tvb_previous_offset = tvb_find_guint8(tvb, tvb_command_start_offset, tvb_len, '}'); tvb_previous_offset = tvb_skip_wsp_return(tvb, tvb_previous_offset -1); tokenlen = tvb_previous_offset - tvb_command_start_offset; } /* not the last command in a context*/ else{ tvb_current_offset = tvb_skip_wsp_return(tvb, tvb_current_offset -1); tokenlen = tvb_current_offset - tvb_command_start_offset; } } /* command includes descriptors */ else{ tvb_current_offset = tvb_skip_wsp_return(tvb, tvb_current_offset -1); tokenlen = tvb_current_offset - tvb_command_start_offset; } /* if a next context is specified */ if ( tvb_get_guint8(tvb, tvb_command_start_offset ) == 'C'){ tvb_current_offset = tvb_command_start_offset; LBRKT_counter = 0; RBRKT_counter = 0; goto nextcontext; } /* creation of the megaco_tree_command_line additionally Command and Transaction ID will be printed in this line */ sub_ti = proto_tree_add_item(megaco_tree,hf_megaco_command_line,tvb,tvb_command_start_offset,tokenlen, FALSE); megaco_tree_command_line = proto_item_add_subtree(sub_ti, ett_megaco_command_line); tvb_next_offset = tvb_command_start_offset + tokenlen; /* Additional value */ if ( tvb_get_guint8(tvb, tvb_command_start_offset ) == 'O'){ proto_tree_add_text(megaco_tree_command_line, tvb, tvb_command_start_offset, 2, "O- indicates an optional command" ); tvb_command_start_offset = tvb_command_start_offset+2; } /* Additional value */ if ( tvb_get_guint8(tvb, tvb_command_start_offset ) == 'W'){ proto_tree_add_text(megaco_tree_command_line, tvb, tvb_command_start_offset, 2, "W- indicates a wildcarded response to a command" ); tvb_command_start_offset = tvb_command_start_offset+2; } tvb_offset = tvb_find_guint8(tvb, tvb_command_start_offset, tvb_len, '='); tvb_offset = tvb_skip_wsp_return(tvb, tvb_offset -1); tokenlen = tvb_offset - tvb_command_start_offset; tempchar = tvb_get_guint8(tvb, tvb_command_start_offset); if ( tempchar != 'E' ){ if ( tvb_get_guint8(tvb, 0 ) == '!'){ switch ( tempchar ){ case 'A': tempchar = tvb_get_guint8(tvb, tvb_command_start_offset+1); switch ( tempchar ){ case 'V': my_proto_tree_add_string(megaco_tree_command_line, hf_megaco_command, tvb, tvb_command_start_offset, tokenlen, "AuditValue"); break; case 'C': my_proto_tree_add_string(megaco_tree_command_line, hf_megaco_command, tvb, tvb_command_start_offset, tokenlen, "AuditCapability"); break; default: my_proto_tree_add_string(megaco_tree_command_line, hf_megaco_command, tvb, tvb_command_start_offset, tokenlen, "Add"); break; } break; case 'N': my_proto_tree_add_string(megaco_tree_command_line, hf_megaco_command, tvb, tvb_command_start_offset, tokenlen, "Notify"); break; case 'M': tempchar = tvb_get_guint8(tvb, tvb_command_start_offset+1); switch ( tempchar ){ case 'F': my_proto_tree_add_string(megaco_tree_command_line, hf_megaco_command, tvb, tvb_command_start_offset, tokenlen, "Modify"); break; case 'V': my_proto_tree_add_string(megaco_tree_command_line, hf_megaco_command, tvb, tvb_command_start_offset, tokenlen, "Move"); break; } break; case 'S': tempchar = tvb_get_guint8(tvb, tvb_command_start_offset+1); switch ( tempchar ){ case 'C': my_proto_tree_add_string(megaco_tree_command_line, hf_megaco_command, tvb, tvb_command_start_offset, tokenlen, "ServiceChange"); break; default: my_proto_tree_add_string(megaco_tree_command_line, hf_megaco_command, tvb, tvb_command_start_offset, tokenlen, "Subtract"); break; } break; default: tokenlen = (tvb_RBRKT+1) - tvb_previous_offset; proto_tree_add_string(megaco_tree, hf_megaco_error_Frame, tvb, tvb_previous_offset, tokenlen, "No Command detectable !"); return; break; } } else{ my_proto_tree_add_string(megaco_tree_command_line, hf_megaco_command, tvb, tvb_command_start_offset, tokenlen, tvb_format_text(tvb, tvb_command_start_offset, tokenlen)); } tvb_offset = tvb_find_guint8(tvb, tvb_command_start_offset, tvb_len, '='); tvb_offset = tvb_skip_wsp(tvb, tvb_offset+1); tokenlen = tvb_next_offset - tvb_offset; tempchar = tvb_get_guint8(tvb, tvb_offset); switch ( tempchar ){ case 'E': tvb_get_nstringz0(tvb,tvb_offset,tokenlen+1,TermID); TermID[0] = 'e'; my_proto_tree_add_string(megaco_tree_command_line, hf_megaco_termid, tvb, tvb_offset, tokenlen, TermID); break; case '*': my_proto_tree_add_string(megaco_tree_command_line, hf_megaco_termid, tvb, tvb_offset, tokenlen, "WildCard all"); break; case '$': my_proto_tree_add_string(megaco_tree_command_line, hf_megaco_termid, tvb, tvb_offset, tokenlen, "WildCard any"); break; default: my_proto_tree_add_string(megaco_tree_command_line, hf_megaco_termid, tvb, tvb_offset, tokenlen, tvb_format_text(tvb, tvb_offset, tokenlen)); break; } } /* Dissect the Descriptors */ if ( LBRKT_counter != 0 && tvb_current_offset != tvb_command_end_offset){ tvb_descriptors_start_offset = tvb_find_guint8(tvb, tvb_command_start_offset, tvb_len, '{'); tvb_descriptors_end_offset = tvb_descriptors_start_offset; while ( LBRKT_counter > 0 ){ tvb_descriptors_end_offset = tvb_find_guint8(tvb, tvb_descriptors_end_offset+1, tvb_len, '}'); LBRKT_counter--; } tempchar = tvb_get_guint8(tvb, tvb_command_start_offset); if ( tempchar == 'E'){ dissect_megaco_descriptors(tvb, megaco_tree_command_line, pinfo, tvb_command_start_offset-1,tvb_descriptors_end_offset); } else { dissect_megaco_descriptors(tvb, megaco_tree_command_line, pinfo, tvb_descriptors_start_offset,tvb_descriptors_end_offset); } } RBRKT_counter = 0; LBRKT_counter = 0; tvb_command_start_offset = tvb_skip_wsp(tvb, tvb_command_end_offset +1); tvb_LBRKT = tvb_command_start_offset; tvb_RBRKT = tvb_command_start_offset; } } while ( tvb_command_end_offset < tvb_len ); } if(global_megaco_raw_text){ tvb_raw_text_add(tvb, megaco_tree); } } static void dissect_megaco_descriptors(tvbuff_t *tvb, proto_tree *megaco_tree_command_line, packet_info *pinfo, gint tvb_descriptors_start_offset, gint tvb_descriptors_end_offset) { gint tvb_len, len; gint tvb_current_offset,tvb_previous_offset,tokenlen; gint tvb_RBRKT, tvb_LBRKT, RBRKT_counter, LBRKT_counter; guint8 tempchar; tvb_len = tvb_length(tvb); len = 0; tvb_RBRKT = 0; tvb_LBRKT = 0; RBRKT_counter = 0; LBRKT_counter = 0; tokenlen = tvb_descriptors_end_offset - tvb_descriptors_start_offset; tvb_LBRKT = tvb_skip_wsp(tvb, tvb_descriptors_start_offset +1); tvb_previous_offset = tvb_LBRKT; tvb_RBRKT = tvb_descriptors_start_offset; do { tvb_RBRKT = tvb_find_guint8(tvb, tvb_RBRKT+1, tvb_len, '}'); tvb_LBRKT = tvb_find_guint8(tvb, tvb_LBRKT, tvb_len, '{'); tvb_current_offset = tvb_find_guint8(tvb, tvb_previous_offset, tvb_len, ','); if (tvb_current_offset == -1 ){ tvb_current_offset = tvb_descriptors_end_offset; } /* Descriptor includes no parameters */ if ( tvb_LBRKT > tvb_current_offset || tvb_LBRKT == -1 ){ if ( tvb_current_offset > tvb_RBRKT ){ tvb_current_offset = tvb_RBRKT; } tvb_RBRKT = tvb_skip_wsp_return(tvb, tvb_current_offset-1)-1; } /* Descriptor includes Parameters */ if ( (tvb_current_offset > tvb_LBRKT && tvb_LBRKT != -1)){ while ( tvb_LBRKT != -1 && tvb_RBRKT > tvb_LBRKT ){ tvb_LBRKT = tvb_find_guint8(tvb, tvb_LBRKT+1, tvb_len, '{'); if ( tvb_LBRKT < tvb_RBRKT && tvb_LBRKT != -1) tvb_RBRKT = tvb_find_guint8(tvb, tvb_RBRKT+1, tvb_len, '}'); } } tempchar = tvb_get_guint8(tvb, tvb_previous_offset ); switch ( tempchar ){ case 'M': tempchar = tvb_get_guint8(tvb, tvb_previous_offset+1 ); switch ( tempchar ){ case 'o': dissect_megaco_modemdescriptor(tvb, megaco_tree_command_line, tvb_RBRKT, tvb_previous_offset); break; case 'D': dissect_megaco_modemdescriptor(tvb, megaco_tree_command_line, tvb_RBRKT, tvb_previous_offset); break; case 'u': dissect_megaco_multiplexdescriptor(tvb, megaco_tree_command_line, tvb_RBRKT, tvb_previous_offset); break; case 'X': dissect_megaco_multiplexdescriptor(tvb, megaco_tree_command_line, tvb_RBRKT, tvb_previous_offset); break; case 'e': dissect_megaco_mediadescriptor(tvb, megaco_tree_command_line, pinfo, tvb_RBRKT, tvb_previous_offset); break; default: dissect_megaco_mediadescriptor(tvb, megaco_tree_command_line, pinfo, tvb_RBRKT, tvb_previous_offset); break; } break; case 'S': tempchar = tvb_get_guint8(tvb, tvb_previous_offset+1 ); switch ( tempchar ){ case 'i': dissect_megaco_signaldescriptor(tvb, pinfo, megaco_tree_command_line, tvb_RBRKT, tvb_previous_offset); break; case 'G': dissect_megaco_signaldescriptor(tvb, pinfo, megaco_tree_command_line, tvb_RBRKT, tvb_previous_offset); break; case 'e': dissect_megaco_servicechangedescriptor(tvb, megaco_tree_command_line, tvb_RBRKT, tvb_previous_offset); break; case 'V': dissect_megaco_servicechangedescriptor(tvb, megaco_tree_command_line, tvb_RBRKT, tvb_previous_offset); break; case 'C': dissect_megaco_servicechangedescriptor(tvb, megaco_tree_command_line, tvb_RBRKT, tvb_previous_offset); break; case 't': dissect_megaco_statisticsdescriptor(tvb, megaco_tree_command_line, tvb_RBRKT, tvb_previous_offset); break; case 'A': dissect_megaco_statisticsdescriptor(tvb, megaco_tree_command_line, tvb_RBRKT, tvb_previous_offset); break; default: tokenlen = (tvb_RBRKT+1) - tvb_previous_offset; proto_tree_add_string(megaco_tree_command_line, hf_megaco_error_Frame, tvb, tvb_previous_offset, tokenlen, "No Descriptor detectable !"); break; } break; case 'E': tempchar = tvb_get_guint8(tvb, tvb_previous_offset+1 ); if ( tempchar == 'r' || tempchar == 'R'){ if ( tvb_get_guint8(tvb, tvb_skip_wsp(tvb, tvb_RBRKT +1)) == ';'){ tvb_RBRKT = tvb_find_guint8(tvb, tvb_RBRKT+1, tvb_len, '}'); tvb_RBRKT = tvb_skip_wsp_return(tvb, tvb_RBRKT -1)-1; } dissect_megaco_errordescriptor(tvb, megaco_tree_command_line, tvb_RBRKT, tvb_previous_offset); } else{ dissect_megaco_eventsdescriptor(tvb, pinfo, megaco_tree_command_line, tvb_RBRKT, tvb_previous_offset); } break; case 'A': dissect_megaco_auditdescriptor(tvb, megaco_tree_command_line, pinfo, tvb_RBRKT, tvb_previous_offset); break; case 'D': dissect_megaco_digitmapdescriptor(tvb, megaco_tree_command_line, tvb_RBRKT, tvb_previous_offset); break; case 'O': dissect_megaco_observedeventsdescriptor(tvb, pinfo, megaco_tree_command_line, tvb_RBRKT, tvb_previous_offset); break; case 'T': dissect_megaco_topologydescriptor(tvb, megaco_tree_command_line, tvb_RBRKT, tvb_previous_offset); break; case 'P': dissect_megaco_Packagesdescriptor(tvb, megaco_tree_command_line, tvb_RBRKT, tvb_previous_offset); break; default: tokenlen = (tvb_RBRKT+1) - tvb_previous_offset; proto_tree_add_string(megaco_tree_command_line, hf_megaco_error_Frame, tvb, tvb_previous_offset, tokenlen, "No Descriptor detectable !"); break; } tokenlen = (tvb_RBRKT+1) - tvb_previous_offset; tvb_current_offset = tvb_find_guint8(tvb, tvb_RBRKT, tvb_len, ','); if (tvb_current_offset == -1 ){ tvb_current_offset = tvb_descriptors_end_offset; } tvb_previous_offset = tvb_skip_wsp(tvb, tvb_current_offset+1); tvb_LBRKT = tvb_previous_offset; tvb_RBRKT = tvb_previous_offset; } while ( tvb_current_offset < tvb_descriptors_end_offset ); } static void dissect_megaco_modemdescriptor(tvbuff_t *tvb, proto_tree *megaco_tree_command_line, gint tvb_RBRKT, gint tvb_previous_offset) { gint tokenlen; tokenlen = 0; tokenlen = (tvb_RBRKT+1) - tvb_previous_offset; proto_tree_add_string(megaco_tree_command_line, hf_megaco_modem_descriptor, tvb, tvb_previous_offset, tokenlen, tvb_format_text(tvb, tvb_previous_offset, tokenlen)); } static void dissect_megaco_multiplexdescriptor(tvbuff_t *tvb, proto_tree *megaco_tree_command_line, gint tvb_RBRKT, gint tvb_previous_offset) { gint tokenlen; tokenlen = 0; tokenlen = (tvb_RBRKT+1) - tvb_previous_offset; proto_tree_add_string(megaco_tree_command_line, hf_megaco_multiplex_descriptor, tvb, tvb_previous_offset, tokenlen, tvb_format_text(tvb, tvb_previous_offset, tokenlen)); } /* mediaDescriptor = MediaToken LBRKT mediaParm *(COMMA mediaParm) RBRKT */ /* MediaToken = ("Media" / "M") */ /* */ /* mediaParm = (streamParm / streamDescriptor /terminationStateDescriptor) */ /* */ /* ; at-most one terminationStateDescriptor */ /* ; and either streamParm(s) or streamDescriptor(s) but not both */ /* streamParm = ( localDescriptor / remoteDescriptor /localControlDescriptor ) */ /* localDescriptor = LocalToken LBRKT octetString RBRKT */ /* LocalToken = ("Local" / "L") */ /* octetString = *(nonEscapeChar) */ /* nonEscapeChar = ( "\}" / %x01-7C / %x7E-FF ) */ /* remoteDescriptor = RemoteToken LBRKT octetString RBRKT */ /* RemoteToken = ("Remote" / "R") */ /* localControlDescriptor = LocalControlToken LBRKT localParm*(COMMA localParm) RBRKT */ /* LocalControlToken = ("LocalControl" / "O") */ /* localParm = ( streamMode / propertyParm / reservedValueMode */ /* streamDescriptor = StreamToken EQUAL StreamID LBRKT streamParm*(COMMA streamParm) RBRKT */ /* StreamToken = ("Stream" / "ST") */ /* terminationStateDescriptor = TerminationStateToken LBRKTterminationStateParm */ /* *( COMMA terminationStateParm ) RBRKT */ /* TerminationStateToken = ("TerminationState" / "TS") */ /* terminationStateParm =(propertyParm / serviceStates / eventBufferControl ) */ static void dissect_megaco_mediadescriptor(tvbuff_t *tvb, proto_tree *megaco_tree_command_line,packet_info *pinfo, gint tvb_RBRKT, gint tvb_previous_offset) { gint tokenlen; gint tvb_next_offset, tvb_current_offset, tvb_offset, tvb_help_offset; guint8 tempchar; proto_tree *megaco_mediadescriptor_tree, *megaco_mediadescriptor_ti; tokenlen = 0; tvb_next_offset = 0; tvb_current_offset = 0; tvb_offset = 0; tvb_help_offset = 0; tokenlen = (tvb_RBRKT+1) - tvb_previous_offset; megaco_mediadescriptor_ti = proto_tree_add_text(megaco_tree_command_line,tvb,tvb_previous_offset,tokenlen,"Media Descriptor"); megaco_mediadescriptor_tree = proto_item_add_subtree(megaco_mediadescriptor_ti, ett_megaco_mediadescriptor); tvb_current_offset = tvb_find_guint8(tvb, tvb_previous_offset, tvb_RBRKT, '='); tokenlen = tvb_current_offset - tvb_previous_offset -1; proto_tree_add_text(megaco_mediadescriptor_tree, tvb, tvb_previous_offset, tokenlen, "%s", tvb_format_text(tvb, tvb_previous_offset, tokenlen)); tvb_next_offset = tvb_find_guint8(tvb, tvb_previous_offset, tvb_RBRKT, '{'); /* If a StreamID is present */ if ( tvb_find_guint8(tvb, tvb_next_offset+1, tvb_RBRKT, '{') > tvb_current_offset && tvb_current_offset > tvb_previous_offset ){ tvb_next_offset = tvb_find_guint8(tvb, tvb_next_offset+1, tvb_RBRKT, '{'); tvb_current_offset = tvb_skip_wsp(tvb, tvb_current_offset +1); tvb_offset = tvb_skip_wsp_return(tvb, tvb_next_offset-2); tokenlen = tvb_offset - tvb_current_offset; proto_tree_add_string(megaco_mediadescriptor_tree, hf_megaco_streamid, tvb, tvb_current_offset, tokenlen, tvb_format_text(tvb, tvb_current_offset, tokenlen)); } tvb_current_offset = tvb_next_offset ; while ( tvb_find_guint8(tvb, tvb_current_offset+1 , tvb_RBRKT, '{') != -1 && tvb_find_guint8(tvb, tvb_current_offset+1 , tvb_RBRKT, '{') < tvb_RBRKT && tvb_next_offset != -1){ tvb_help_offset = tvb_next_offset; tvb_current_offset = tvb_find_guint8(tvb, tvb_current_offset+1 , tvb_RBRKT, '{'); tvb_next_offset = tvb_find_guint8(tvb, tvb_current_offset+1 , tvb_RBRKT, '}'); tvb_offset = tvb_skip_wsp_return(tvb, tvb_current_offset-1)-1; if ( (tvb_next_offset - tvb_current_offset ) > 3 ){ tvb_next_offset = tvb_skip_wsp_return(tvb, tvb_next_offset-1); tvb_current_offset = tvb_skip_wsp(tvb, tvb_current_offset +1); } tempchar = tvb_get_guint8(tvb, tvb_offset); switch ( tempchar ){ case 'R': /* Remote Descriptor in short message encoding */ dissect_megaco_Remotedescriptor(tvb,megaco_mediadescriptor_tree, pinfo, tvb_next_offset, tvb_current_offset); break; case 'L': /* Local Descriptor in short message encoding */ dissect_megaco_Localdescriptor(tvb,megaco_mediadescriptor_tree , pinfo, tvb_next_offset, tvb_current_offset); break; case 'O': /* Local Control Descriptor in short message encoding */ dissect_megaco_LocalControldescriptor(tvb,megaco_mediadescriptor_tree , tvb_next_offset, tvb_current_offset); break; case 'S': /* Termination State Descriptor in short message encoding */ dissect_megaco_TerminationStatedescriptor(tvb,megaco_mediadescriptor_tree , tvb_next_offset, tvb_current_offset); break; case 'l': /* Local or Local Control Descriptor in long message encoding */ if (tvb_get_guint8(tvb, tvb_offset-1) == 'a'){ dissect_megaco_Localdescriptor(tvb,megaco_mediadescriptor_tree , pinfo, tvb_next_offset, tvb_current_offset); } else{ dissect_megaco_LocalControldescriptor(tvb,megaco_mediadescriptor_tree , tvb_next_offset, tvb_current_offset); } break; case 'e': /* Remote or Termination State Descriptor in long message encoding */ if (tvb_get_guint8(tvb, tvb_offset-2) == 'a'){ dissect_megaco_TerminationStatedescriptor(tvb,megaco_mediadescriptor_tree , tvb_next_offset, tvb_current_offset); } else { dissect_megaco_Remotedescriptor(tvb,megaco_mediadescriptor_tree , pinfo, tvb_next_offset, tvb_current_offset); } break; default: if ( tvb_find_guint8(tvb, tvb_help_offset, tvb_RBRKT, '{') > tvb_find_guint8(tvb, tvb_help_offset, tvb_RBRKT, '=')){ tvb_help_offset = tvb_find_guint8(tvb, tvb_help_offset, tvb_RBRKT, '='); tvb_help_offset = tvb_skip_wsp(tvb, tvb_help_offset +1); tokenlen = tvb_offset - tvb_help_offset + 1; proto_tree_add_string(megaco_mediadescriptor_tree, hf_megaco_streamid, tvb, tvb_help_offset, tokenlen, tvb_format_text(tvb, tvb_help_offset, tokenlen)); } else { tokenlen = (tvb_RBRKT+1) - tvb_offset; proto_tree_add_string(megaco_mediadescriptor_tree, hf_megaco_error_Frame, tvb, tvb_offset, tokenlen, "No Descriptor detectable !"); } break; } } } static void dissect_megaco_h245(tvbuff_t *tvb, packet_info *pinfo, proto_tree *megaco_tree, gint offset, gint len, gchar *msg) { proto_item *item; proto_tree *tree; guint8 buf[10240]; item=proto_tree_add_string(megaco_tree, hf_megaco_h245, tvb, offset, len, msg ); tree = proto_item_add_subtree(item, ett_megaco_h245); /* arbitrary maximum length */ if(len<20480){ int i; tvbuff_t *h245_tvb; /* first, skip to where the encoded pdu starts, this is the first hex digit after the '=' char. */ while(1){ if((*msg==0)||(*msg=='\n')){ return; } if(*msg=='='){ msg++; break; } msg++; } while(1){ if((*msg==0)||(*msg=='\n')){ return; } if( ((*msg>='0')&&(*msg<='9')) || ((*msg>='a')&&(*msg<='f')) || ((*msg>='A')&&(*msg<='F'))){ break; } msg++; } i=0; while( ((*msg>='0')&&(*msg<='9')) ||((*msg>='a')&&(*msg<='f')) ||((*msg>='A')&&(*msg<='F')) ){ int val; if((*msg>='0')&&(*msg<='9')){ val=(*msg)-'0'; } else if((*msg>='a')&&(*msg<='f')){ val=(*msg)-'a'+10; } else if((*msg>='A')&&(*msg<='F')){ val=(*msg)-'A'+10; } else { return; } val<<=4; msg++; if((*msg>='0')&&(*msg<='9')){ val|=(*msg)-'0'; } else if((*msg>='a')&&(*msg<='f')){ val|=(*msg)-'a'+10; } else if((*msg>='A')&&(*msg<='F')){ val|=(*msg)-'A'+10; } else { return; } msg++; buf[i]=(guint8)val; i++; } if(i==0){ return; } h245_tvb = tvb_new_real_data(buf,i,i); tvb_set_child_real_data_tvbuff(tvb,h245_tvb); add_new_data_source(pinfo, h245_tvb, "H.245 over MEGACO"); /* should go through a handle, however, the two h245 entry points are different, one is over tpkt and the other is raw */ call_dissector(h245_handle, h245_tvb, pinfo, top_tree); /* dissect_h245_MultimediaSystemControlMessage(h245_tvb, pinfo, tree);*/ } } static void dissect_megaco_eventsdescriptor(tvbuff_t *tvb, packet_info *pinfo, proto_tree *megaco_tree_command_line, gint tvb_RBRKT, gint tvb_previous_offset) { gint tokenlen, tvb_current_offset, tvb_next_offset, tvb_help_offset; gint tvb_events_end_offset, tvb_events_start_offset, tvb_LBRKT; proto_tree *megaco_eventsdescriptor_tree, *megaco_eventsdescriptor_ti; guint8 tempchar; gint requested_event_start_offset, requested_event_end_offset; proto_tree *megaco_requestedevent_tree, *megaco_requestedevent_ti; tokenlen = 0; tvb_current_offset = 0; tvb_next_offset = 0; tvb_help_offset = 0; tvb_events_end_offset = 0; tvb_events_start_offset = 0; tvb_help_offset = 0; requested_event_start_offset = 0; requested_event_end_offset = 0; tokenlen = (tvb_RBRKT+1) - tvb_previous_offset; megaco_eventsdescriptor_ti = proto_tree_add_item(megaco_tree_command_line,hf_megaco_events_descriptor,tvb,tvb_previous_offset,tokenlen, FALSE); megaco_eventsdescriptor_tree = proto_item_add_subtree(megaco_eventsdescriptor_ti, ett_megaco_eventsdescriptor); tvb_current_offset = tvb_find_guint8(tvb, tvb_previous_offset, tvb_RBRKT, '='); tvb_next_offset = tvb_find_guint8(tvb, tvb_previous_offset, tvb_RBRKT, '{'); if ( tvb_current_offset < tvb_RBRKT && tvb_current_offset != -1 ){ tvb_current_offset = tvb_skip_wsp(tvb, tvb_current_offset +1); tvb_help_offset = tvb_skip_wsp_return(tvb, tvb_next_offset-1); tokenlen = tvb_help_offset - tvb_current_offset; proto_tree_add_string(megaco_eventsdescriptor_tree, hf_megaco_requestid, tvb, tvb_current_offset, tokenlen, tvb_format_text(tvb, tvb_current_offset, tokenlen)); tvb_events_end_offset = tvb_RBRKT; tvb_events_start_offset = tvb_previous_offset; tvb_RBRKT = tvb_next_offset+1; tvb_LBRKT = tvb_next_offset+1; tvb_previous_offset = tvb_skip_wsp(tvb, tvb_next_offset+1); do { tvb_RBRKT = tvb_find_guint8(tvb, tvb_RBRKT+1, tvb_events_end_offset, '}'); tvb_LBRKT = tvb_find_guint8(tvb, tvb_LBRKT, tvb_events_end_offset, '{'); tvb_current_offset = tvb_find_guint8(tvb, tvb_previous_offset, tvb_events_end_offset, ','); if (tvb_current_offset == -1 || tvb_current_offset > tvb_events_end_offset){ tvb_current_offset = tvb_events_end_offset; } /* Descriptor includes no parameters */ if ( tvb_LBRKT > tvb_current_offset || tvb_LBRKT == -1 ){ tvb_RBRKT = tvb_skip_wsp_return(tvb, tvb_current_offset-1)-1; } /* Descriptor includes Parameters */ if ( (tvb_current_offset > tvb_LBRKT && tvb_LBRKT != -1)){ while ( tvb_LBRKT != -1 && tvb_RBRKT > tvb_LBRKT ){ tvb_LBRKT = tvb_find_guint8(tvb, tvb_LBRKT+1, tvb_events_end_offset, '{'); if ( tvb_LBRKT < tvb_RBRKT && tvb_LBRKT != -1) tvb_RBRKT = tvb_find_guint8(tvb, tvb_RBRKT+1, tvb_events_end_offset, '}'); } } tvb_help_offset = tvb_find_guint8(tvb, tvb_previous_offset, tvb_events_end_offset, '{'); /* if there are eventparameter */ if ( tvb_help_offset < tvb_RBRKT && tvb_help_offset != -1 ){ requested_event_start_offset = tvb_help_offset; requested_event_end_offset = tvb_RBRKT; tvb_help_offset = tvb_skip_wsp_return(tvb, tvb_help_offset-1); tokenlen = tvb_help_offset - tvb_previous_offset; } /* no parameters */ else { tokenlen = tvb_RBRKT+1 - tvb_previous_offset; } megaco_requestedevent_ti = proto_tree_add_item(megaco_eventsdescriptor_tree,hf_megaco_pkgdname,tvb,tvb_previous_offset,tokenlen, FALSE); megaco_requestedevent_tree = proto_item_add_subtree(megaco_requestedevent_ti, ett_megaco_requestedevent); if ( tvb_help_offset < tvb_RBRKT && tvb_help_offset != -1 ){ tvb_help_offset = tvb_skip_wsp(tvb, requested_event_start_offset +1); tempchar = tvb_get_guint8(tvb, tvb_help_offset); requested_event_start_offset = tvb_skip_wsp(tvb, requested_event_start_offset +1); requested_event_end_offset = tvb_skip_wsp_return(tvb, requested_event_end_offset-1); if ( tempchar == 'D' ){ dissect_megaco_digitmapdescriptor(tvb, megaco_requestedevent_tree, requested_event_end_offset, requested_event_start_offset); } else{ gchar *msg; tokenlen = requested_event_end_offset - requested_event_start_offset; msg=tvb_format_text(tvb,requested_event_start_offset, tokenlen); if(!strncmp("h245", msg, 4)){ dissect_megaco_h245(tvb, pinfo, megaco_requestedevent_tree, requested_event_start_offset, tokenlen, msg); } else { proto_tree_add_text(megaco_requestedevent_tree, tvb, requested_event_start_offset, tokenlen, "%s", msg); } } } tvb_current_offset = tvb_find_guint8(tvb, tvb_RBRKT, tvb_events_end_offset, ','); if (tvb_current_offset == -1 || tvb_current_offset > tvb_events_end_offset ){ tvb_current_offset = tvb_events_end_offset; } tvb_previous_offset = tvb_skip_wsp(tvb, tvb_current_offset+1); tvb_LBRKT = tvb_previous_offset; tvb_RBRKT = tvb_previous_offset; } while ( tvb_current_offset < tvb_events_end_offset ); } } static void dissect_megaco_signaldescriptor(tvbuff_t *tvb, packet_info *pinfo, proto_tree *megaco_tree_command_line, gint tvb_RBRKT, gint tvb_previous_offset) { gint tokenlen, tvb_current_offset, tvb_next_offset, tvb_help_offset; gint tvb_signals_end_offset, tvb_signals_start_offset, tvb_LBRKT; proto_tree *megaco_signalsdescriptor_tree, *megaco_signalsdescriptor_ti; gint requested_signal_start_offset, requested_signal_end_offset; proto_tree *megaco_requestedsignal_tree, *megaco_requestedsignal_ti; tokenlen = 0; tvb_current_offset = 0; tvb_next_offset = 0; tvb_help_offset = 0; tvb_signals_end_offset = 0; tvb_signals_start_offset = 0; tvb_LBRKT = 0; requested_signal_start_offset = 0; requested_signal_end_offset = 0; tokenlen = (tvb_RBRKT+1) - tvb_previous_offset; megaco_signalsdescriptor_ti = proto_tree_add_item(megaco_tree_command_line,hf_megaco_signal_descriptor,tvb,tvb_previous_offset,tokenlen, FALSE); megaco_signalsdescriptor_tree = proto_item_add_subtree(megaco_signalsdescriptor_ti, ett_megaco_signalsdescriptor); tvb_current_offset = tvb_find_guint8(tvb, tvb_previous_offset, tvb_RBRKT, '{'); tvb_next_offset = tvb_skip_wsp(tvb, tvb_current_offset+1); tvb_signals_end_offset = tvb_RBRKT; tvb_signals_start_offset = tvb_previous_offset; if ( tvb_current_offset < tvb_RBRKT && tvb_current_offset != -1 && tvb_next_offset != tvb_signals_end_offset){ tvb_RBRKT = tvb_next_offset+1; tvb_LBRKT = tvb_next_offset+1; tvb_previous_offset = tvb_next_offset; do { tvb_RBRKT = tvb_find_guint8(tvb, tvb_RBRKT+1, tvb_signals_end_offset, '}'); tvb_LBRKT = tvb_find_guint8(tvb, tvb_LBRKT, tvb_signals_end_offset, '{'); tvb_current_offset = tvb_find_guint8(tvb, tvb_previous_offset, tvb_signals_end_offset, ','); if (tvb_current_offset == -1 || tvb_current_offset > tvb_signals_end_offset){ tvb_current_offset = tvb_signals_end_offset; } /* Descriptor includes no parameters */ if ( tvb_LBRKT > tvb_current_offset || tvb_LBRKT == -1 ){ tvb_RBRKT = tvb_skip_wsp_return(tvb, tvb_current_offset-1)-1; } /* Descriptor includes Parameters */ if ( (tvb_current_offset > tvb_LBRKT && tvb_LBRKT != -1)){ while ( tvb_LBRKT != -1 && tvb_RBRKT > tvb_LBRKT ){ tvb_LBRKT = tvb_find_guint8(tvb, tvb_LBRKT+1, tvb_signals_end_offset, '{'); if ( tvb_LBRKT < tvb_RBRKT && tvb_LBRKT != -1) tvb_RBRKT = tvb_find_guint8(tvb, tvb_RBRKT+1, tvb_signals_end_offset, '}'); } } tvb_help_offset = tvb_find_guint8(tvb, tvb_previous_offset, tvb_signals_end_offset, '{'); /* if there are signalparameter */ if ( tvb_help_offset < tvb_RBRKT && tvb_help_offset != -1 ){ requested_signal_start_offset = tvb_help_offset; requested_signal_end_offset = tvb_RBRKT; tvb_help_offset = tvb_skip_wsp_return(tvb, tvb_help_offset-1); tokenlen = tvb_help_offset - tvb_previous_offset; } /* no parameters */ else { tokenlen = tvb_RBRKT+1 - tvb_previous_offset; } megaco_requestedsignal_ti = proto_tree_add_item(megaco_signalsdescriptor_tree,hf_megaco_pkgdname,tvb,tvb_previous_offset,tokenlen, FALSE); megaco_requestedsignal_tree = proto_item_add_subtree(megaco_requestedsignal_ti, ett_megaco_requestedsignal); if ( tvb_help_offset < tvb_RBRKT && tvb_help_offset != -1 ){ gchar *msg; requested_signal_start_offset = tvb_skip_wsp(tvb, requested_signal_start_offset +1); requested_signal_end_offset = tvb_skip_wsp_return(tvb, requested_signal_end_offset-1); tokenlen = requested_signal_end_offset - requested_signal_start_offset; msg=tvb_format_text(tvb,requested_signal_start_offset, tokenlen+1); if(!strncmp("h245", msg, 4)){ dissect_megaco_h245(tvb, pinfo, megaco_requestedsignal_tree, requested_signal_start_offset, tokenlen, msg); } else { proto_tree_add_text(megaco_requestedsignal_tree, tvb, requested_signal_start_offset, tokenlen, "%s", msg); } } tvb_current_offset = tvb_find_guint8(tvb, tvb_RBRKT, tvb_signals_end_offset, ','); if (tvb_current_offset == -1 || tvb_current_offset > tvb_signals_end_offset ){ tvb_current_offset = tvb_signals_end_offset; } tvb_previous_offset = tvb_skip_wsp(tvb, tvb_current_offset+1); tvb_LBRKT = tvb_previous_offset; tvb_RBRKT = tvb_previous_offset; } while ( tvb_current_offset < tvb_signals_end_offset ); } } static void dissect_megaco_auditdescriptor(tvbuff_t *tvb, proto_tree *megaco_tree_command_line, packet_info *pinfo, gint tvb_RBRKT, gint tvb_previous_offset) { gint tokenlen; proto_tree *megaco_auditdescriptor_tree, *megaco_auditdescriptor_ti; tokenlen = 0; tokenlen = (tvb_RBRKT+1) - tvb_previous_offset; megaco_auditdescriptor_ti = proto_tree_add_item(megaco_tree_command_line,hf_megaco_audit_descriptor,tvb,tvb_previous_offset,tokenlen, FALSE); megaco_auditdescriptor_tree = proto_item_add_subtree(megaco_auditdescriptor_ti, ett_megaco_auditdescriptor); tvb_previous_offset = tvb_find_guint8(tvb, tvb_previous_offset, tvb_RBRKT, '{'); if ( tvb_skip_wsp(tvb, tvb_previous_offset +1) != tvb_RBRKT ){ dissect_megaco_descriptors(tvb, megaco_auditdescriptor_tree, pinfo, tvb_previous_offset,tvb_RBRKT); } } static void dissect_megaco_servicechangedescriptor(tvbuff_t *tvb, proto_tree *megaco_tree_command_line, gint tvb_RBRKT, gint tvb_previous_offset) { gint tokenlen; tokenlen = 0; tokenlen = (tvb_RBRKT+1) - tvb_previous_offset; proto_tree_add_string(megaco_tree_command_line, hf_megaco_servicechange_descriptor, tvb, tvb_previous_offset, tokenlen, tvb_format_text(tvb, tvb_previous_offset, tokenlen)); } static void dissect_megaco_digitmapdescriptor(tvbuff_t *tvb, proto_tree *megaco_tree_command_line, gint tvb_RBRKT, gint tvb_previous_offset) { gint tokenlen; tokenlen = 0; tokenlen = tvb_RBRKT - tvb_previous_offset; proto_tree_add_string(megaco_tree_command_line, hf_megaco_digitmap_descriptor, tvb, tvb_previous_offset, tokenlen, tvb_format_text(tvb, tvb_previous_offset, tokenlen)); } static void dissect_megaco_statisticsdescriptor(tvbuff_t *tvb, proto_tree *megaco_tree_command_line, gint tvb_RBRKT, gint tvb_previous_offset) { gint tokenlen; tokenlen = 0; tokenlen = (tvb_RBRKT+1) - tvb_previous_offset; proto_tree_add_string(megaco_tree_command_line, hf_megaco_statistics_descriptor, tvb, tvb_previous_offset, tokenlen, tvb_format_text(tvb, tvb_previous_offset, tokenlen)); } static void dissect_megaco_observedeventsdescriptor(tvbuff_t *tvb, packet_info *pinfo, proto_tree *megaco_tree_command_line, gint tvb_RBRKT, gint tvb_previous_offset) { gint tokenlen, tvb_current_offset, tvb_next_offset, tvb_help_offset; gint tvb_observedevents_end_offset, tvb_observedevents_start_offset, tvb_LBRKT; proto_tree *megaco_observedeventsdescriptor_tree, *megaco_observedeventsdescriptor_ti; guint8 tempchar; gint requested_event_start_offset, requested_event_end_offset, param_start_offset, param_end_offset; proto_tree *megaco_observedevent_tree, *megaco_observedevent_ti; tokenlen = 0; tvb_current_offset = 0; tvb_next_offset = 0; tvb_help_offset = 0; tvb_observedevents_end_offset = 0; tvb_observedevents_start_offset = 0; tvb_LBRKT = 0; requested_event_start_offset = 0; requested_event_end_offset = 0; tokenlen = (tvb_RBRKT+1) - tvb_previous_offset; megaco_observedeventsdescriptor_ti = proto_tree_add_item(megaco_tree_command_line,hf_megaco_observedevents_descriptor,tvb,tvb_previous_offset,tokenlen, FALSE); megaco_observedeventsdescriptor_tree = proto_item_add_subtree(megaco_observedeventsdescriptor_ti, ett_megaco_observedeventsdescriptor); tvb_current_offset = tvb_find_guint8(tvb, tvb_previous_offset, tvb_RBRKT, '='); tvb_next_offset = tvb_find_guint8(tvb, tvb_previous_offset, tvb_RBRKT, '{'); if ( tvb_current_offset < tvb_RBRKT && tvb_current_offset != -1 ){ tvb_current_offset = tvb_skip_wsp(tvb, tvb_current_offset +1); tvb_help_offset = tvb_skip_wsp_return(tvb, tvb_next_offset-1); tokenlen = tvb_help_offset - tvb_current_offset; proto_tree_add_string(megaco_observedeventsdescriptor_tree, hf_megaco_requestid, tvb, tvb_current_offset, tokenlen, tvb_format_text(tvb, tvb_current_offset, tokenlen)); tvb_observedevents_end_offset = tvb_RBRKT; tvb_observedevents_start_offset = tvb_previous_offset; tvb_RBRKT = tvb_next_offset+1; tvb_LBRKT = tvb_next_offset+1; tvb_previous_offset = tvb_skip_wsp(tvb, tvb_next_offset+1); do { tvb_RBRKT = tvb_find_guint8(tvb, tvb_RBRKT+1, tvb_observedevents_end_offset, '}'); tvb_LBRKT = tvb_find_guint8(tvb, tvb_LBRKT, tvb_observedevents_end_offset, '{'); tvb_current_offset = tvb_find_guint8(tvb, tvb_previous_offset, tvb_observedevents_end_offset, ','); if (tvb_current_offset == -1 || tvb_current_offset > tvb_observedevents_end_offset){ tvb_current_offset = tvb_observedevents_end_offset; } /* Descriptor includes no parameters */ if ( tvb_LBRKT > tvb_current_offset || tvb_LBRKT == -1 ){ tvb_RBRKT = tvb_skip_wsp_return(tvb, tvb_current_offset-1)-1; } /* Descriptor includes Parameters */ if ( (tvb_current_offset > tvb_LBRKT && tvb_LBRKT != -1)){ while ( tvb_LBRKT != -1 && tvb_RBRKT > tvb_LBRKT ){ tvb_LBRKT = tvb_find_guint8(tvb, tvb_LBRKT+1, tvb_observedevents_end_offset, '{'); if ( tvb_LBRKT < tvb_RBRKT && tvb_LBRKT != -1){ tvb_RBRKT = tvb_find_guint8(tvb, tvb_RBRKT+1, tvb_observedevents_end_offset, '}'); } } } tvb_help_offset = tvb_find_guint8(tvb, tvb_previous_offset, tvb_observedevents_end_offset, '{'); /* if there are eventparameter */ if ( tvb_help_offset < tvb_RBRKT && tvb_help_offset != -1 ){ requested_event_start_offset = tvb_help_offset; requested_event_end_offset = tvb_RBRKT; tvb_help_offset = tvb_skip_wsp_return(tvb, tvb_help_offset-1); tokenlen = tvb_help_offset - tvb_previous_offset; } /* no parameters */ else { tokenlen = tvb_RBRKT+1 - tvb_previous_offset; } megaco_observedevent_ti = proto_tree_add_item(megaco_observedeventsdescriptor_tree,hf_megaco_pkgdname,tvb,tvb_previous_offset,tokenlen, FALSE); megaco_observedevent_tree = proto_item_add_subtree(megaco_observedevent_ti, ett_megaco_observedevent); if ( tvb_help_offset < tvb_RBRKT && tvb_help_offset != -1 ){ tvb_help_offset = tvb_skip_wsp(tvb, requested_event_start_offset +1); tempchar = tvb_get_guint8(tvb, tvb_help_offset); requested_event_start_offset = tvb_skip_wsp(tvb, requested_event_start_offset +1)-1; requested_event_end_offset = tvb_skip_wsp_return(tvb, requested_event_end_offset-1); tvb_help_offset = requested_event_start_offset; do { gchar *msg; param_start_offset = tvb_skip_wsp(tvb, tvb_help_offset+1); tvb_help_offset = tvb_find_guint8(tvb, tvb_help_offset+1,requested_event_end_offset, ','); if ( tvb_help_offset > requested_event_end_offset || tvb_help_offset == -1){ tvb_help_offset = requested_event_end_offset; } param_end_offset = tvb_skip_wsp(tvb, tvb_help_offset-1); tokenlen = param_end_offset - param_start_offset+1; msg=tvb_format_text(tvb,param_start_offset, tokenlen); if(!strncmp("h245", msg, 4)){ dissect_megaco_h245(tvb, pinfo, megaco_observedevent_tree, param_start_offset, tokenlen, msg); } else { proto_tree_add_text(megaco_observedevent_tree, tvb, param_start_offset, tokenlen, "%s", msg); } } while ( tvb_help_offset < requested_event_end_offset ); } tvb_current_offset = tvb_find_guint8(tvb, tvb_RBRKT, tvb_observedevents_end_offset, ','); if (tvb_current_offset == -1 || tvb_current_offset > tvb_observedevents_end_offset ){ tvb_current_offset = tvb_observedevents_end_offset; } tvb_previous_offset = tvb_skip_wsp(tvb, tvb_current_offset+1); tvb_LBRKT = tvb_previous_offset; tvb_RBRKT = tvb_previous_offset; } while ( tvb_current_offset < tvb_observedevents_end_offset ); } } static void dissect_megaco_topologydescriptor(tvbuff_t *tvb, proto_tree *megaco_tree_command_line, gint tvb_RBRKT, gint tvb_previous_offset) { gint tokenlen; tokenlen = 0; tokenlen = (tvb_RBRKT+1) - tvb_previous_offset; proto_tree_add_string(megaco_tree_command_line, hf_megaco_topology_descriptor, tvb, tvb_previous_offset, tokenlen, tvb_format_text(tvb, tvb_previous_offset, tokenlen)); } static void dissect_megaco_Packagesdescriptor(tvbuff_t *tvb, proto_tree *megaco_tree_command_line, gint tvb_RBRKT, gint tvb_previous_offset) { gint tokenlen, tvb_current_offset, tvb_next_offset, tvb_help_offset; gint tvb_packages_end_offset, tvb_packages_start_offset, tvb_LBRKT; proto_tree *megaco_packagesdescriptor_tree, *megaco_packagesdescriptor_ti; tokenlen = 0; tvb_current_offset = 0; tvb_next_offset = 0; tvb_help_offset = 0; tvb_packages_end_offset = 0; tvb_packages_start_offset = 0; tvb_LBRKT = 0; tokenlen = (tvb_RBRKT+1) - tvb_previous_offset; megaco_packagesdescriptor_ti = proto_tree_add_item(megaco_tree_command_line,hf_megaco_packages_descriptor,tvb,tvb_previous_offset,tokenlen, FALSE); megaco_packagesdescriptor_tree = proto_item_add_subtree(megaco_packagesdescriptor_ti, ett_megaco_packagesdescriptor); tvb_current_offset = tvb_find_guint8(tvb, tvb_previous_offset, tvb_RBRKT, '='); tvb_next_offset = tvb_find_guint8(tvb, tvb_previous_offset, tvb_RBRKT, '{'); if ( tvb_current_offset < tvb_RBRKT && tvb_current_offset != -1 ){ tvb_current_offset = tvb_skip_wsp(tvb, tvb_current_offset +1); tvb_help_offset = tvb_skip_wsp_return(tvb, tvb_next_offset-1); tokenlen = tvb_help_offset - tvb_current_offset; proto_tree_add_string(megaco_packagesdescriptor_tree, hf_megaco_requestid, tvb, tvb_current_offset, tokenlen, tvb_format_text(tvb, tvb_current_offset, tokenlen)); tvb_packages_end_offset = tvb_RBRKT; tvb_packages_start_offset = tvb_previous_offset; tvb_RBRKT = tvb_next_offset+1; tvb_LBRKT = tvb_next_offset+1; tvb_previous_offset = tvb_skip_wsp(tvb, tvb_next_offset+1); do { tvb_RBRKT = tvb_find_guint8(tvb, tvb_RBRKT+1, tvb_packages_end_offset, '}'); tvb_LBRKT = tvb_find_guint8(tvb, tvb_LBRKT, tvb_packages_end_offset, '{'); tvb_current_offset = tvb_find_guint8(tvb, tvb_previous_offset, tvb_packages_end_offset, ','); if (tvb_current_offset == -1 || tvb_current_offset > tvb_packages_end_offset){ tvb_current_offset = tvb_packages_end_offset; } /* Descriptor includes no parameters */ if ( tvb_LBRKT > tvb_current_offset || tvb_LBRKT == -1 ){ tvb_RBRKT = tvb_skip_wsp_return(tvb, tvb_current_offset-1)-1; } /* Descriptor includes Parameters */ if ( (tvb_current_offset > tvb_LBRKT && tvb_LBRKT != -1)){ while ( tvb_LBRKT != -1 && tvb_RBRKT > tvb_LBRKT ){ tvb_LBRKT = tvb_find_guint8(tvb, tvb_LBRKT+1, tvb_packages_end_offset, '{'); if ( tvb_LBRKT < tvb_RBRKT && tvb_LBRKT != -1) tvb_RBRKT = tvb_find_guint8(tvb, tvb_RBRKT+1, tvb_packages_end_offset, '}'); } } tokenlen = tvb_RBRKT+1 - tvb_previous_offset; proto_tree_add_text(megaco_packagesdescriptor_tree, tvb, tvb_previous_offset, tokenlen, "%s", tvb_format_text(tvb,tvb_previous_offset, tokenlen)); tvb_current_offset = tvb_find_guint8(tvb, tvb_RBRKT, tvb_packages_end_offset, ','); if (tvb_current_offset == -1 || tvb_current_offset > tvb_packages_end_offset ){ tvb_current_offset = tvb_packages_end_offset; } tvb_previous_offset = tvb_skip_wsp(tvb, tvb_current_offset+1); tvb_LBRKT = tvb_previous_offset; tvb_RBRKT = tvb_previous_offset; } while ( tvb_current_offset < tvb_packages_end_offset ); } } /* The list of error code values is fetched from http://www.iana.org/assignments/megaco-h248 */ /* 2003-08-28 */ static const value_string MEGACO_error_code_vals[] = { {400, "Syntax error in message"}, {401, "Protocol Error"}, {402, "Unauthorized"}, {403, "Syntax error in transaction request"}, {406, "Version Not Supported"}, {410, "Incorrect identifier"}, {411, "The transaction refers to an unknown ContextId"}, {412, "No ContextIDs available"}, {421, "Unknown action or illegal combination of actions"}, {422, "Syntax Error in Action"}, {430, "Unknown TerminationID"}, {431, "No TerminationID matched a wildcard"}, {432, "Out of TerminationIDs or No TerminationID available"}, {433, "TerminationID is already in a Context"}, {434, "Max number of Terminations in a Context exceeded"}, {435, "Termination ID is not in specified Context"}, {440, "Unsupported or unknown Package"}, {441, "Missing Remote or Local Descriptor"}, {442, "Syntax Error in Command"}, {443, "Unsupported or Unknown Command"}, {444, "Unsupported or Unknown Descriptor"}, {445, "Unsupported or Unknown Property"}, {446, "Unsupported or Unknown Parameter"}, {447, "Descriptor not legal in this command"}, {448, "Descriptor appears twice in a command"}, {450, "No such property in this package"}, {451, "No such event in this package"}, {452, "No such signal in this package"}, {453, "No such statistic in this package"}, {454, "No such parameter value in this package"}, {455, "Property illegal in this Descriptor"}, {456, "Property appears twice in this Descriptor"}, {457, "Missing parameter in signal or event"}, {458, "Unexpected Event/Request ID"}, {459, "Unsupported or Unknown Profile"}, {471, "Implied Add for Multiplex failure"}, {500, "Internal software Failure in MG"}, {501, "Not Implemented"}, {502, "Not ready."}, {503, "Service Unavailable"}, {504, "Command Received from unauthorized entity"}, {505, "Transaction Request Received before a Service Change Reply has been received"}, {506, "Number of Transaction Pendings Exceeded"}, {510, "Insufficient resources"}, {512, "Media Gateway unequipped to detect requested Event"}, {513, "Media Gateway unequipped to generate requested Signals"}, {514, "Media Gateway cannot send the specified announcement"}, {515, "Unsupported Media Type"}, {517, "Unsupported or invalid mode"}, {518, "Event buffer full"}, {519, "Out of space to store digit map"}, {520, "Digit Map undefined in the MG"}, {521, "Termination is ServiceChangeing"}, {526, "Insufficient bandwidth"}, {529, "Internal hardware failure in MG"}, {530, "Temporary Network failure"}, {531, "Permanent Network failure"}, {532, "Audited Property, Statistic, Event or Signal does not exist"}, {533, "Response exceeds maximum transport PDU size"}, {534, "Illegal write or read only property"}, {540, "Unexpected initial hook state"}, {581, "Does Not Exist"}, {600, "Illegal syntax within an announcement specification"}, {601, "Variable type not supported"}, {602, "Variable value out of range"}, {603, "Category not supported"}, {604, "Selector type not supported"}, {605, "Selector value not supported"}, {606, "Unknown segment ID"}, {607, "Mismatch between play specification and provisioned data"}, {608, "Provisioning error"}, {609, "Invalid offset"}, {610, "No free segment IDs"}, {611, "Temporary segment not found"}, {612, "Segment in use"}, {613, "ISP port limit overrun"}, {614, "No modems available"}, {615, "Calling number unacceptable"}, {616, "Called number unacceptable"}, { 0, NULL } }; static void dissect_megaco_errordescriptor(tvbuff_t *tvb, proto_tree *megaco_tree_command_line, gint tvb_RBRKT, gint tvb_previous_offset) { gint tokenlen; gint error_code; guint8 error[4]; gint tvb_next_offset, tvb_current_offset,tvb_len; tvb_len = tvb_length(tvb); tokenlen = 0; tvb_next_offset = 0; tvb_current_offset = 0; tvb_len = 0; tvb_current_offset = tvb_find_guint8(tvb, tvb_previous_offset , tvb_RBRKT, '='); tvb_current_offset = tvb_skip_wsp(tvb, tvb_current_offset +1); tvb_get_nstringz0(tvb,tvb_current_offset,4,error); error_code = atoi(error); proto_tree_add_string_hidden(megaco_tree_command_line, hf_megaco_error_descriptor, tvb, tvb_current_offset, 3, tvb_format_text(tvb, tvb_current_offset, 3)); tokenlen = (tvb_RBRKT) - tvb_previous_offset+1; proto_tree_add_string(megaco_tree_command_line, hf_megaco_error_descriptor, tvb, tvb_previous_offset, tokenlen, tvb_format_text(tvb, tvb_previous_offset, tokenlen)); proto_tree_add_text(megaco_tree_command_line, tvb, tvb_current_offset, 3, "Error code: %s", val_to_str(error_code, MEGACO_error_code_vals, "Unknown (%u)")); } static void dissect_megaco_TerminationStatedescriptor(tvbuff_t *tvb, proto_tree *megaco_mediadescriptor_tree, gint tvb_next_offset, gint tvb_current_offset) { gint tokenlen; gint tvb_offset, tvb_help_offset; guint8 tempchar; proto_tree *megaco_TerminationState_tree, *megaco_TerminationState_ti; tokenlen = 0; tvb_offset = 0; tvb_help_offset = 0; tvb_offset = tvb_find_guint8(tvb, tvb_current_offset , tvb_next_offset, '='); tokenlen = tvb_next_offset - tvb_current_offset; megaco_TerminationState_ti = proto_tree_add_item(megaco_mediadescriptor_tree,hf_megaco_TerminationState_descriptor,tvb,tvb_current_offset,tokenlen, FALSE); megaco_TerminationState_tree = proto_item_add_subtree(megaco_TerminationState_ti, ett_megaco_TerminationState); while ( tvb_offset < tvb_next_offset && tvb_offset != -1 ){ tempchar = tvb_get_guint8(tvb, tvb_current_offset); tvb_help_offset = tvb_current_offset; tvb_current_offset = tvb_skip_wsp(tvb, tvb_offset +1); switch ( tempchar ){ case 'S': tvb_offset = tvb_find_guint8(tvb, tvb_current_offset , tvb_offset, ','); if ( tvb_offset == -1 || tvb_offset > tvb_next_offset ){ tvb_offset = tvb_next_offset; } tempchar = tvb_get_guint8(tvb, tvb_current_offset); tokenlen = tvb_offset - tvb_current_offset; proto_tree_add_string(megaco_TerminationState_tree, hf_megaco_Service_State, tvb, tvb_current_offset, tokenlen, tvb_format_text(tvb, tvb_current_offset, tokenlen)); break; case 'B': tvb_offset = tvb_find_guint8(tvb, tvb_current_offset , tvb_offset, ','); if ( tvb_offset == -1 || tvb_offset > tvb_next_offset ){ tvb_offset = tvb_next_offset; } tempchar = tvb_get_guint8(tvb, tvb_current_offset); tokenlen = tvb_offset - tvb_current_offset; proto_tree_add_string(megaco_TerminationState_tree, hf_megaco_Event_Buffer_Control, tvb, tvb_current_offset, tokenlen, tvb_format_text(tvb, tvb_current_offset, tokenlen)); break; case 'E': tvb_offset = tvb_find_guint8(tvb, tvb_current_offset , tvb_offset, ','); if ( tvb_offset == -1 || tvb_offset > tvb_next_offset ){ tvb_offset = tvb_next_offset; } tempchar = tvb_get_guint8(tvb, tvb_current_offset); tokenlen = tvb_offset - tvb_current_offset; proto_tree_add_string(megaco_TerminationState_tree, hf_megaco_Event_Buffer_Control, tvb, tvb_current_offset, tokenlen, tvb_format_text(tvb, tvb_current_offset, tokenlen)); break; default: tvb_offset = tvb_find_guint8(tvb, tvb_current_offset , tvb_offset, ','); if ( tvb_offset == -1 || tvb_offset > tvb_next_offset ){ tvb_offset = tvb_next_offset; } tempchar = tvb_get_guint8(tvb, tvb_help_offset); tokenlen = tvb_offset - tvb_help_offset; proto_tree_add_text(megaco_TerminationState_tree, tvb, tvb_help_offset, tokenlen, "%s", tvb_format_text(tvb,tvb_help_offset, tokenlen)); break; } tvb_current_offset = tvb_skip_wsp(tvb, tvb_offset +1); tvb_offset = tvb_find_guint8(tvb, tvb_current_offset , tvb_next_offset, '='); } } static void dissect_megaco_Localdescriptor(tvbuff_t *tvb, proto_tree *megaco_mediadescriptor_tree,packet_info *pinfo, gint tvb_next_offset, gint tvb_current_offset) { gint tokenlen; tvbuff_t *next_tvb; proto_tree *megaco_localdescriptor_tree, *megaco_localdescriptor_ti; tokenlen = 0; tokenlen = tvb_next_offset - tvb_current_offset; megaco_localdescriptor_ti = proto_tree_add_item(megaco_mediadescriptor_tree,hf_megaco_Local_descriptor,tvb,tvb_current_offset,tokenlen, FALSE); megaco_localdescriptor_tree = proto_item_add_subtree(megaco_localdescriptor_ti, ett_megaco_Localdescriptor); tokenlen = tvb_next_offset - tvb_current_offset; if ( tokenlen > 3 ){ next_tvb = tvb_new_subset(tvb, tvb_current_offset, tokenlen, tokenlen); call_dissector(sdp_handle, next_tvb, pinfo, megaco_localdescriptor_tree); } } static void dissect_megaco_Remotedescriptor(tvbuff_t *tvb, proto_tree *megaco_mediadescriptor_tree,packet_info *pinfo, gint tvb_next_offset, gint tvb_current_offset) { gint tokenlen; tvbuff_t *next_tvb; proto_tree *megaco_Remotedescriptor_tree, *megaco_Remotedescriptor_ti; tokenlen = 0; tokenlen = tvb_next_offset - tvb_current_offset; megaco_Remotedescriptor_ti = proto_tree_add_item(megaco_mediadescriptor_tree,hf_megaco_Remote_descriptor,tvb,tvb_current_offset,tokenlen, FALSE); megaco_Remotedescriptor_tree = proto_item_add_subtree(megaco_Remotedescriptor_ti, ett_megaco_Remotedescriptor); if ( tokenlen > 3 ){ next_tvb = tvb_new_subset(tvb, tvb_current_offset, tokenlen, tokenlen); call_dissector(sdp_handle, next_tvb, pinfo, megaco_Remotedescriptor_tree); } } static void dissect_megaco_LocalControldescriptor(tvbuff_t *tvb, proto_tree *megaco_mediadescriptor_tree, gint tvb_next_offset, gint tvb_current_offset) { gint tokenlen; gint tvb_offset,tvb_help_offset; guint8 tempchar; proto_tree *megaco_LocalControl_tree, *megaco_LocalControl_ti; tokenlen = 0; tvb_offset = 0; tvb_help_offset = 0; tvb_offset = tvb_find_guint8(tvb, tvb_current_offset , tvb_next_offset, '='); tokenlen = tvb_next_offset - tvb_current_offset; megaco_LocalControl_ti = proto_tree_add_item(megaco_mediadescriptor_tree,hf_megaco_LocalControl_descriptor,tvb,tvb_current_offset,tokenlen, FALSE); megaco_LocalControl_tree = proto_item_add_subtree(megaco_LocalControl_ti, ett_megaco_LocalControldescriptor); while ( tvb_offset < tvb_next_offset && tvb_offset != -1 ){ tempchar = tvb_get_guint8(tvb, tvb_current_offset); tvb_help_offset = tvb_current_offset; tvb_current_offset = tvb_skip_wsp(tvb, tvb_offset +1); switch ( tempchar ){ case 'M': tvb_offset = tvb_find_guint8(tvb, tvb_current_offset , tvb_offset, ','); if ( tvb_offset == -1 || tvb_offset > tvb_next_offset ){ tvb_offset = tvb_next_offset; } tokenlen = tvb_offset - tvb_current_offset; proto_tree_add_string(megaco_LocalControl_tree, hf_megaco_mode, tvb, tvb_current_offset, tokenlen, tvb_format_text(tvb, tvb_current_offset, tokenlen)); tvb_current_offset = tvb_skip_wsp(tvb, tvb_offset +1); break; case 'R': if ( tvb_get_guint8(tvb, tvb_help_offset+1) == 'V' || tvb_get_guint8(tvb, tvb_help_offset+8) == 'V'){ tvb_offset = tvb_find_guint8(tvb, tvb_current_offset , tvb_offset, ','); if ( tvb_offset == -1 || tvb_offset > tvb_next_offset ){ tvb_offset = tvb_next_offset; } tokenlen = tvb_offset - tvb_current_offset; proto_tree_add_string(megaco_LocalControl_tree, hf_megaco_reserve_value, tvb, tvb_current_offset, tokenlen, tvb_format_text(tvb, tvb_current_offset, tokenlen)); tvb_current_offset = tvb_skip_wsp(tvb, tvb_offset +1); } else { tvb_offset = tvb_find_guint8(tvb, tvb_current_offset , tvb_offset, ','); if ( tvb_offset == -1 || tvb_offset > tvb_next_offset ){ tvb_offset = tvb_next_offset; } tokenlen = tvb_offset - tvb_current_offset; proto_tree_add_string(megaco_LocalControl_tree, hf_megaco_reserve_group, tvb, tvb_current_offset, tokenlen, tvb_format_text(tvb, tvb_current_offset, tokenlen)); tvb_current_offset = tvb_skip_wsp(tvb, tvb_offset +1); } break; default: tvb_offset = tvb_find_guint8(tvb, tvb_current_offset , tvb_offset, ','); if ( tvb_offset == -1 || tvb_offset > tvb_next_offset ){ tvb_offset = tvb_next_offset; } tokenlen = tvb_offset - tvb_help_offset; proto_tree_add_text(megaco_LocalControl_tree, tvb, tvb_help_offset, tokenlen, "%s", tvb_format_text(tvb,tvb_help_offset, tokenlen)); tvb_current_offset = tvb_skip_wsp(tvb, tvb_offset +1); break; } tvb_offset = tvb_find_guint8(tvb, tvb_current_offset , tvb_next_offset, '='); } } /* Copied from MGCP dissector, prints whole message in raw text */ static void tvb_raw_text_add(tvbuff_t *tvb, proto_tree *tree){ gint tvb_linebegin,tvb_lineend,tvb_len,linelen; tvb_linebegin = 0; tvb_len = tvb_length(tvb); do { tvb_find_line_end(tvb,tvb_linebegin,-1,&tvb_lineend,FALSE); linelen = tvb_lineend - tvb_linebegin; proto_tree_add_text(tree, tvb, tvb_linebegin, linelen, "%s", tvb_format_text(tvb,tvb_linebegin, linelen)); tvb_linebegin = tvb_lineend; } while ( tvb_lineend < tvb_len ); } /* Register all the bits needed with the filtering engine */ void proto_register_megaco(void) { static hf_register_info hf[] = { { &hf_megaco_audit_descriptor, { "Audit Descriptor", "megaco.audit", FT_STRING, BASE_DEC, NULL, 0x0, "Audit Descriptor of the megaco Command ", HFILL }}, { &hf_megaco_command_line, { "Command line", "megaco.command_line", FT_STRING, BASE_DEC, NULL, 0x0, "Commands of this message ", HFILL }}, { &hf_megaco_command, { "Command", "megaco.command", FT_STRING, BASE_DEC, NULL, 0x0, "Command of this message ", HFILL }}, { &hf_megaco_Context, { "Context", "megaco.context", FT_STRING, BASE_DEC, NULL, 0x0, "Context ID of this massage ", HFILL }}, { &hf_megaco_digitmap_descriptor, { "DigitMap Descriptor", "megaco.digitmap", FT_STRING, BASE_DEC, NULL, 0x0, "DigitMap Descriptor of the megaco Command ", HFILL }}, { &hf_megaco_error_descriptor, { "ERROR Descriptor", "megaco.error", FT_STRING, BASE_DEC, NULL, 0x0, "Error Descriptor of the megaco Command ", HFILL }}, { &hf_megaco_error_Frame, { "ERROR frame", "megaco.error_frame", FT_STRING, BASE_DEC, NULL, 0x0, "Syntax error ", HFILL }}, { &hf_megaco_Event_Buffer_Control, { "Event Buffer Control", "megaco.eventbuffercontrol", FT_STRING, BASE_DEC, NULL, 0x0, "Event Buffer Control in Termination State Descriptor", HFILL }}, { &hf_megaco_events_descriptor, { "Events Descriptor", "megaco.events", FT_STRING, BASE_DEC, NULL, 0x0, "Events Descriptor of the megaco Command ", HFILL }}, { &hf_megaco_Local_descriptor, { "Local Descriptor", "megaco.localdescriptor", FT_STRING, BASE_DEC, NULL, 0x0, "Local Descriptor in Media Descriptor ", HFILL }}, { &hf_megaco_LocalControl_descriptor, { "Local Control Descriptor", "megaco.localcontroldescriptor", FT_STRING, BASE_DEC, NULL, 0x0, "Local Control Descriptor in Media Descriptor ", HFILL }}, { &hf_megaco_media_descriptor, { "Media Descriptor", "megaco.media", FT_STRING, BASE_DEC, NULL, 0x0, "Media Descriptor of the megaco Command ", HFILL }}, { &hf_megaco_modem_descriptor, { "Modem Descriptor", "megaco.modem", FT_STRING, BASE_DEC, NULL, 0x0, "Modem Descriptor of the megaco Command ", HFILL }}, { &hf_megaco_mode, { "Mode", "megaco.mode", FT_STRING, BASE_DEC, NULL, 0x0, "Mode sendonly/receiveonly/inactive/loopback", HFILL }}, { &hf_megaco_multiplex_descriptor, { "Multiplex Descriptor", "megaco.multiplex", FT_STRING, BASE_DEC, NULL, 0x0, "Multiplex Descriptor of the megaco Command ", HFILL }}, { &hf_megaco_observedevents_descriptor, { "Observed Events Descriptor", "megaco.observedevents", FT_STRING, BASE_DEC, NULL, 0x0, "Observed Events Descriptor of the megaco Command ", HFILL }}, { &hf_megaco_packages_descriptor, { "Packages Descriptor", "megaco.packagesdescriptor", FT_STRING, BASE_DEC, NULL, 0x0, "Packages Descriptor", HFILL }}, { &hf_megaco_pkgdname, { "pkgdName", "megaco.pkgdname", FT_STRING, BASE_DEC, NULL, 0x0, "PackageName SLASH ItemID", HFILL }}, { &hf_megaco_Remote_descriptor, { "Remote Descriptor", "megaco.remotedescriptor", FT_STRING, BASE_DEC, NULL, 0x0, "Remote Descriptor in Media Descriptor ", HFILL }}, { &hf_megaco_reserve_group, { "Reserve Group", "megaco.reservegroup", FT_STRING, BASE_DEC, NULL, 0x0, "Reserve Group on or off", HFILL }}, { &hf_megaco_reserve_value, { "Reserve Value", "megaco.reservevalue", FT_STRING, BASE_DEC, NULL, 0x0, "Reserve Value on or off", HFILL }}, { &hf_megaco_requestid, { "RequestID", "megaco.requestid", FT_STRING, BASE_DEC, NULL, 0x0, "RequestID in Events or Observedevents Descriptor ", HFILL }}, { &hf_megaco_servicechange_descriptor, { "Service Change Descriptor", "megaco.servicechange", FT_STRING, BASE_DEC, NULL, 0x0, "Service Change Descriptor of the megaco Command ", HFILL }}, { &hf_megaco_Service_State, { "Service State", "megaco.servicestates", FT_STRING, BASE_DEC, NULL, 0x0, "Service States in Termination State Descriptor", HFILL }}, { &hf_megaco_signal_descriptor, { "Signal Descriptor", "megaco.signal", FT_STRING, BASE_DEC, NULL, 0x0, "Signal Descriptor of the megaco Command ", HFILL }}, { &hf_megaco_statistics_descriptor, { "Statistics Descriptor", "megaco.statistics", FT_STRING, BASE_DEC, NULL, 0x0, "Statistics Descriptor of the megaco Command ", HFILL }}, { &hf_megaco_streamid, { "StreamID", "megaco.streamid", FT_STRING, BASE_DEC, NULL, 0x0, "StreamID in the Media Descriptor ", HFILL }}, { &hf_megaco_termid, { "Termination ID", "megaco.termid", FT_STRING, BASE_DEC, NULL, 0x0, "Termination ID of this Command ", HFILL }}, { &hf_megaco_TerminationState_descriptor, { "Termination State Descriptor", "megaco.terminationstate", FT_STRING, BASE_DEC, NULL, 0x0, "Termination State Descriptor in Media Descriptor ", HFILL }}, { &hf_megaco_topology_descriptor, { "Topology Descriptor", "megaco.topology", FT_STRING, BASE_DEC, NULL, 0x0, "Topology Descriptor of the megaco Command ", HFILL }}, { &hf_megaco_transaction, { "Transaction", "megaco.transaction", FT_STRING, BASE_DEC, NULL, 0x0, "Message Originator", HFILL }}, { &hf_megaco_transid, { "Transaction ID", "megaco.transid", FT_STRING, BASE_DEC, NULL, 0x0, "Transaction ID of this message", HFILL }}, { &hf_megaco_mId, { "MediagatewayID", "megaco.mId", FT_STRING, BASE_DEC, NULL, 0x0, "Mediagateway ID", HFILL }}, { &hf_megaco_version, { "Version", "megaco.version", FT_STRING, BASE_DEC, NULL, 0x0, "Version", HFILL }}, { &hf_megaco_h245, { "h245", "megaco.h245", FT_STRING, BASE_DEC, NULL, 0x0, "Embedded H.245 message", HFILL }}, /* Add more fields here */ }; static gint *ett[] = { &ett_megaco, &ett_megaco_command_line, &ett_megaco_descriptors, &ett_megaco_mediadescriptor, &ett_megaco_TerminationState, &ett_megaco_Remotedescriptor, &ett_megaco_Localdescriptor, &ett_megaco_LocalControldescriptor, &ett_megaco_auditdescriptor, &ett_megaco_eventsdescriptor, &ett_megaco_observedeventsdescriptor, &ett_megaco_observedevent, &ett_megaco_packagesdescriptor, &ett_megaco_requestedevent, &ett_megaco_signalsdescriptor, &ett_megaco_requestedsignal, &ett_megaco_h245, }; module_t *megaco_module; proto_megaco = proto_register_protocol("MEGACO", "MEGACO", "megaco"); proto_register_field_array(proto_megaco, hf, array_length(hf)); proto_register_subtree_array(ett, array_length(ett)); /* Register our configuration options, particularly our ports */ megaco_module = prefs_register_protocol(proto_megaco, proto_reg_handoff_megaco); prefs_register_uint_preference(megaco_module, "tcp.txt_port", "MEGACO Text TCP Port", "Set the TCP port for MEGACO text messages", 10, &global_megaco_txt_tcp_port); prefs_register_uint_preference(megaco_module, "udp.txt_port", "MEGACO Text UDP Port", "Set the UDP port for MEGACO text messages", 10, &global_megaco_txt_udp_port); #if 0 prefs_register_uint_preference(megaco_module, "tcp.bin_port", "MEGACO Binary TCP Port", "Set the TCP port for MEGACO binary messages", 10, &global_megaco_bin_tcp_port); prefs_register_uint_preference(megaco_module, "udp.bin_port", "MEGACO Binary UDP Port", "Set the UDP port for MEGACO binary messages", 10, &global_megaco_bin_udp_port); #endif prefs_register_bool_preference(megaco_module, "display_raw_text", "Display raw text for MEGACO message", "Specifies that the raw text of the " "MEGACO message should be displayed " "instead of (or in addition to) the " "dissection tree", &global_megaco_raw_text); prefs_register_bool_preference(megaco_module, "display_dissect_tree", "Display tree dissection for MEGACO message", "Specifies that the dissection tree of the " "MEGACO message should be displayed " "instead of (or in addition to) the " "raw text", &global_megaco_dissect_tree); } /* The registration hand-off routine */ void proto_reg_handoff_megaco(void) { static int megaco_prefs_initialized = FALSE; static dissector_handle_t megaco_text_tcp_handle; sdp_handle = find_dissector("sdp"); h245_handle = find_dissector("h245dg"); if (!megaco_prefs_initialized) { megaco_text_handle = create_dissector_handle(dissect_megaco_text, proto_megaco); megaco_text_tcp_handle = create_dissector_handle(dissect_megaco_text_tcp, proto_megaco); megaco_prefs_initialized = TRUE; } else { dissector_delete("tcp.port", txt_tcp_port, megaco_text_tcp_handle); dissector_delete("udp.port", txt_udp_port, megaco_text_handle); #if 0 dissector_delete("tcp.port", bin_tcp_port, megaco_text_tcp_handle); dissector_delete("udp.port", bin_udp_port, megaco_bin_handle); #endif } /* Set our port number for future use */ txt_tcp_port = global_megaco_txt_tcp_port; txt_udp_port = global_megaco_txt_udp_port; #if 0 bin_tcp_port = global_megaco_bin_tcp_port; bin_udp_port = global_megaco_bin_udp_port; #endif dissector_add("tcp.port", global_megaco_txt_tcp_port, megaco_text_tcp_handle); dissector_add("udp.port", global_megaco_txt_udp_port, megaco_text_handle); #if 0 dissector_add("tcp.port", global_megaco_bin_tcp_port, megaco_bin_handle); dissector_add("udp.port", global_megaco_bin_udp_port, megaco_bin_handle); #endif /* XXX - text or binary? Does that depend on the port number? */ dissector_add("sctp.ppi", H248_PAYLOAD_PROTOCOL_ID, megaco_text_handle); } /* * tvb_skip_wsp - Returns the position in tvb of the first non-whitespace * character following offset or offset + maxlength -1 whichever * is smaller. * * Parameters: * tvb - The tvbuff in which we are skipping whitespaces, tab and end_of_line characters. * offset - The offset in tvb from which we begin trying to skip whitespace. * * Returns: The position in tvb of the first non-whitespace */ static gint tvb_skip_wsp(tvbuff_t* tvb, gint offset ){ gint counter = offset; gint end,tvb_len; guint8 tempchar; tvb_len = tvb_length(tvb); end = tvb_len; for(counter = offset; counter < end && ((tempchar = tvb_get_guint8(tvb,counter)) == ' ' || tempchar == '\t'|| tempchar == '\n');counter++); return (counter); } static gint tvb_skip_wsp_return(tvbuff_t* tvb, gint offset){ gint counter = offset; gint end; guint8 tempchar; end = 0; for(counter = offset; counter > end && ((tempchar = tvb_get_guint8(tvb,counter)) == ' ' || tempchar == '\t'|| tempchar == '\n');counter--); counter++; return (counter); } /* Start the functions we need for the plugin stuff */ #ifndef ENABLE_STATIC G_MODULE_EXPORT void plugin_reg_handoff(void){ proto_reg_handoff_megaco(); } G_MODULE_EXPORT void plugin_init(plugin_address_table_t *pat #ifndef PLUGINS_NEED_ADDRESS_TABLE _U_ #endif ){ /* initialise the table of pointers needed in Win32 DLLs */ plugin_address_table_init(pat); /* register the new protocol, protocol fields, and subtrees */ if (proto_megaco == -1) { /* execute protocol initialization only once */ proto_register_megaco(); } } #endif /* End the functions we need for plugin stuff */