/* 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 * Modified 2005 by Karl Knoebl * * provide info to COL_INFO and some "prettification" * * Copyright (c) 2006 Anders Broman * * Wireshark - 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 #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #ifdef NEED_G_ASCII_STRCASECMP_H #include "g_ascii_strcasecmp.h" #endif #define PORT_MEGACO_TXT 2944 #define PORT_MEGACO_BIN 2945 /* 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_h324_muxtbl_in = -1; static int hf_megaco_h324_muxtbl_out = -1; static int hf_megaco_ds_dscp = -1; static int hf_megaco_h324_h223capr = -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; static int hf_megaco_h223Capability = -1; /* Define the trees for megaco */ static int ett_megaco = -1; static int ett_megaco_message = -1; static int ett_megaco_message_body = -1; static int ett_megaco_context = -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 gcp_hf_ett_t megaco_ctx_ids = {{-1,-1,-1,-1,-1,-1},{-1,-1,-1,-1}}; static dissector_handle_t megaco_text_handle; static int megaco_tap = -1; /* * 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 guint global_megaco_txt_tcp_port = PORT_MEGACO_TXT; static guint 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 megaco_tvb_skip_wsp(tvbuff_t* tvb, gint offset); static gint megaco_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_LocalControldescriptor(tvbuff_t *tvb, proto_tree *tree, packet_info *pinfo, 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 data_handle; static dissector_handle_t sdp_handle; static dissector_handle_t h245_handle; static dissector_handle_t h248_handle; static gboolean keep_persistent_data = FALSE; 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); } #define ERRORTOKEN 1 #define TRANSTOKEN 2 #define REPLYTOKEN 3 #define PENDINGTOKEN 4 #define RESPONSEACKTOKEN 5 typedef struct { const char *name; const char *compact_name; } megaco_tokens_t; static const megaco_tokens_t megaco_messageBody_names[] = { { "Unknown-token", NULL }, /* 0 Pad so that the real headers start at index 1 */ { "Error", "ER" }, /* 1 */ { "Transaction", "T" }, /* 2 */ { "Reply", "P" }, /* 3 */ { "Pending", "PN" }, /* 4 */ { "TransactionResponseAck", "K" }, /* 5 */ }; /* Returns index of megaco_tokens_t */ static gint find_megaco_messageBody_names(tvbuff_t *tvb, int offset, guint header_len) { guint i; for (i = 1; i < array_length(megaco_messageBody_names); i++) { if (header_len == strlen(megaco_messageBody_names[i].name) && tvb_strncaseeql(tvb, offset, megaco_messageBody_names[i].name, header_len) == 0) return i; if (megaco_messageBody_names[i].compact_name != NULL && header_len == strlen(megaco_messageBody_names[i].compact_name) && tvb_strncaseeql(tvb, offset, megaco_messageBody_names[i].compact_name, header_len) == 0) return i; } return -1; } /* * 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 line_start_offset, ver_offset, ver_length, mId_offset, mId_length; gint tvb_command_start_offset, tvb_command_end_offset; gint tvb_descriptors_start_offset, tvb_descriptors_end_offset; proto_tree *megaco_tree, *message_tree, *message_body_tree, *megaco_context_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 TermID[30]; guint8 tempchar; gint tvb_RBRKT, tvb_LBRKT, RBRKT_counter, LBRKT_counter; guint token_index=0; gcp_msg_t* msg = NULL; gcp_trx_t* trx = NULL; gcp_ctx_t* ctx = NULL; gcp_cmd_t* cmd = NULL; gcp_term_t* term = NULL; gcp_trx_type_t trx_type = GCP_TRX_NONE; guint32 trx_id = 0; guint32 ctx_id = 0; gcp_cmd_type_t cmd_type = GCP_CMD_NONE; gcp_wildcard_t wild_term = GCP_WILDCARD_NONE; 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; msg = gcp_msg(pinfo, TVB_RAW_OFFSET(tvb), keep_persistent_data); /* * 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 = megaco_tvb_skip_wsp(tvb, tvb_offset); line_start_offset = 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 (g_ascii_strncasecmp(word, "MEGACO", 6) != 0 && tvb_get_guint8(tvb, tvb_offset ) != '!'){ gint8 class; gboolean pc; gint32 tag; dissector_handle_t handle = data_handle; get_ber_identifier(tvb, 0, &class, &pc, &tag); if (class == BER_CLASS_UNI && pc && tag == BER_UNI_TAG_SEQUENCE ) { handle = h248_handle; } call_dissector(handle,tvb,pinfo,tree); return; } /* Display MEGACO in protocol column */ if (check_col(pinfo->cinfo, COL_PROTOCOL)) col_set_str(pinfo->cinfo, COL_PROTOCOL, "MEGACO"); /* Build the info tree if we've been given a root */ /* 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; ver_offset = tvb_previous_offset; ver_length = 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); /* accept white spaces as SEParator too */ if ( (tvb_current_offset=tvb_find_guint8(tvb, tvb_previous_offset, tokenlen, ' ')) != -1 ) { /* SEP after mID might be spaces only */ tokenlen = tvb_current_offset-tvb_previous_offset; tvb_next_offset = megaco_tvb_skip_wsp(tvb, tvb_current_offset); } /* Att this point we should point to the "\n" ending the mId element * or to the next character after white space SEP */ mId_offset = tvb_previous_offset; mId_length = tokenlen; /* Add the first line to the tree */ tokenlen = tvb_next_offset - line_start_offset; ti = proto_tree_add_text(megaco_tree, tvb, line_start_offset, tokenlen, "%s",tvb_format_text(tvb,line_start_offset,tokenlen)); message_tree = proto_item_add_subtree(ti, ett_megaco_message); if (tree){ if(global_megaco_dissect_tree){ proto_tree_add_item(message_tree, hf_megaco_version,tvb, ver_offset, ver_length, FALSE); proto_tree_add_item(message_tree, hf_megaco_mId,tvb, mId_offset, mId_length, FALSE); }else{ proto_tree_add_item_hidden(message_tree, hf_megaco_version,tvb, ver_offset, ver_length, FALSE); proto_tree_add_item_hidden(message_tree, hf_megaco_mId,tvb, mId_offset, mId_length, FALSE); } } 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); if ( (tempchar >= 'a')&& (tempchar <= 'z')) tempchar = tempchar - 0x20; /* Find token length */ for (tvb_offset=tvb_previous_offset; tvb_offset < tvb_len-1; tvb_offset++){ if (!isalpha(tvb_get_guint8(tvb, tvb_offset ))){ break; } } tokenlen = tvb_offset - tvb_previous_offset; token_index = find_megaco_messageBody_names(tvb, tvb_previous_offset, tokenlen); /* Debug code g_warning("token_index %u",token_index); */ switch ( token_index ){ /* errorDescriptor */ case ERRORTOKEN: if (check_col(pinfo->cinfo, COL_INFO) ) col_set_str(pinfo->cinfo, COL_INFO, "Error "); tvb_current_offset = tvb_find_guint8(tvb, tvb_offset+1, tvb_len, '}'); ti = proto_tree_add_text(megaco_tree, tvb, tvb_previous_offset, tvb_current_offset-tvb_previous_offset, "%s",tvb_format_text(tvb, tvb_previous_offset, tvb_current_offset-tvb_previous_offset+1)); message_body_tree = proto_item_add_subtree(ti, ett_megaco_message_body); if (tree) { my_proto_tree_add_string(message_body_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 * transactionResponseAck = ResponseAckToken LBRKT transactionAck * *(COMMA transactionAck) RBRKT * transactionAck = transactionID / (transactionID "-" transactionID) */ case RESPONSEACKTOKEN: trx_type = GCP_TRX_ACK; tvb_LBRKT = tvb_find_guint8(tvb, tvb_offset, tvb_len, '{'); tvb_offset = tvb_LBRKT; ti = proto_tree_add_text(megaco_tree, tvb, tvb_previous_offset, tvb_offset-tvb_previous_offset, "%s",tvb_format_text(tvb, tvb_previous_offset, tvb_offset-tvb_previous_offset+1)); message_body_tree = proto_item_add_subtree(ti, ett_megaco_message_body); my_proto_tree_add_string(message_body_tree, hf_megaco_transaction, tvb, tvb_previous_offset, tokenlen, "TransactionResponseAck" ); tvb_previous_offset = megaco_tvb_skip_wsp(tvb, tvb_offset+1); tvb_current_offset = tvb_find_guint8(tvb, tvb_offset+1, tvb_len, '}'); tvb_current_offset = megaco_tvb_skip_wsp_return(tvb, tvb_current_offset)-1; /* cut last RBRKT */ len = tvb_current_offset - tvb_previous_offset; if (check_col(pinfo->cinfo, COL_INFO) ) col_add_fstr(pinfo->cinfo, COL_INFO, "%s TransactionResponseAck", tvb_format_text(tvb,tvb_previous_offset,len)); trx_id = strtoul(tvb_format_text(tvb,tvb_offset,len),NULL,10); if(tree) my_proto_tree_add_string(message_body_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); } tvb_previous_offset = tvb_LBRKT +1; return; break; /* Pe and PN is transactionPending, P+"any char" is transactionReply */ case PENDINGTOKEN: trx_type = GCP_TRX_PENDING; tvb_offset = tvb_find_guint8(tvb, tvb_previous_offset, tvb_len, '=')+1; tvb_offset = megaco_tvb_skip_wsp(tvb, tvb_offset); tvb_LBRKT = tvb_find_guint8(tvb, tvb_offset, tvb_len, '{'); tvb_current_offset = tvb_LBRKT; ti = proto_tree_add_text(megaco_tree, tvb, tvb_previous_offset, tvb_current_offset-tvb_previous_offset, "%s",tvb_format_text(tvb, tvb_previous_offset, tvb_current_offset-tvb_previous_offset+1)); message_body_tree = proto_item_add_subtree(ti, ett_megaco_message_body); tvb_current_offset = megaco_tvb_skip_wsp_return(tvb, tvb_current_offset-1); len = tvb_current_offset - tvb_offset; if (tree) my_proto_tree_add_string(message_body_tree, hf_megaco_transaction, tvb, tvb_previous_offset, tokenlen, "Pending" ); if (check_col(pinfo->cinfo, COL_INFO) ) col_add_fstr(pinfo->cinfo, COL_INFO, "%s Pending", tvb_format_text(tvb,tvb_offset,len)); trx_id = strtoul(tvb_format_text(tvb,tvb_offset,len),NULL,10); if(tree) my_proto_tree_add_string(message_body_tree, hf_megaco_transid, tvb, tvb_offset, len, tvb_format_text(tvb,tvb_offset,len)); return; break; /* transactionReply */ case REPLYTOKEN: trx_type = GCP_TRX_REPLY; tvb_LBRKT = tvb_find_guint8(tvb, tvb_offset, tvb_len, '{'); ti = proto_tree_add_text(megaco_tree, tvb, tvb_previous_offset, tvb_LBRKT-tvb_previous_offset, "%s",tvb_format_text(tvb, tvb_previous_offset, tvb_LBRKT-tvb_previous_offset+1)); message_body_tree = proto_item_add_subtree(ti, ett_megaco_message_body); if (tree) my_proto_tree_add_string(message_body_tree, hf_megaco_transaction, tvb, tvb_previous_offset, tokenlen, "Reply" ); tvb_offset = tvb_find_guint8(tvb, tvb_previous_offset, tvb_len, '=')+1; tvb_offset = megaco_tvb_skip_wsp(tvb, tvb_offset); tvb_current_offset = megaco_tvb_skip_wsp_return(tvb, tvb_LBRKT-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)); trx_id = strtoul(tvb_format_text(tvb,tvb_offset,len),NULL,10); if(tree) my_proto_tree_add_string(message_body_tree, hf_megaco_transid, tvb, tvb_offset, len, tvb_format_text(tvb,tvb_offset,len)); /* Find if we have a errorDescriptor or actionReplyList */ tvb_offset = megaco_tvb_skip_wsp(tvb, tvb_LBRKT+1); tempchar = tvb_get_guint8(tvb,tvb_offset); if ((tempchar == 'E')||(tempchar == 'e')){ dissect_megaco_errordescriptor(tvb, megaco_tree, tvb_len-1, tvb_offset); return; } /* Offset should be at first printarable char after { */ tvb_previous_offset = tvb_offset; break; case TRANSTOKEN: /* TransactionRequest */ trx_type = GCP_TRX_REQUEST; tvb_LBRKT = tvb_find_guint8(tvb, tvb_offset, tvb_len, '{'); tvb_current_offset = tvb_LBRKT; ti = proto_tree_add_text(megaco_tree, tvb, tvb_previous_offset, tvb_current_offset-tvb_previous_offset, "%s",tvb_format_text(tvb, tvb_previous_offset, tvb_current_offset-tvb_previous_offset+1)); message_body_tree = proto_item_add_subtree(ti, ett_megaco_message_body); if(tree) my_proto_tree_add_string(message_body_tree, hf_megaco_transaction, tvb, tvb_previous_offset, tokenlen, "Request" ); tvb_offset = tvb_find_guint8(tvb, tvb_offset, tvb_len, '=')+1; tvb_offset = megaco_tvb_skip_wsp(tvb, tvb_offset); tvb_current_offset = megaco_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)); trx_id = strtoul(tvb_format_text(tvb,tvb_offset,len),NULL,10); if(tree) my_proto_tree_add_string(message_body_tree, hf_megaco_transid, tvb, tvb_offset,len, tvb_format_text(tvb,tvb_offset,len)); /* Offset should be at first printarable char after { */ tvb_previous_offset = megaco_tvb_skip_wsp(tvb, tvb_LBRKT+1); 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") * * errorDescriptor = ErrorToken EQUAL ErrorCode * LBRKT [quotedString] RBRKT * * transactionRequest = TransToken EQUAL TransactionID LBRKT * actionRequest *(COMMA actionRequest) RBRKT * TransToken = ("Transaction" / "T") */ trx = gcp_trx(msg , trx_id , trx_type, keep_persistent_data); /* Find Context */ nextcontext: tvb_next_offset = tvb_find_guint8(tvb, tvb_previous_offset, tvb_len, '{'); ti = proto_tree_add_text(megaco_tree, tvb, tvb_previous_offset, tvb_next_offset-tvb_previous_offset+1, "%s", tvb_format_text(tvb, tvb_previous_offset, tvb_next_offset-tvb_previous_offset+1)); megaco_context_tree = proto_item_add_subtree(ti, ett_megaco_context); tvb_previous_offset = tvb_find_guint8(tvb, tvb_current_offset, tvb_len, '=')+1; tvb_previous_offset = megaco_tvb_skip_wsp(tvb, tvb_previous_offset); if (tvb_current_offset >= tvb_next_offset) { proto_tree_add_text(megaco_tree, tvb, 0, 0, "[ Parse error: Invalid offset ]"); return; } tvb_current_offset = tvb_next_offset; 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 '$': ctx_id = CHOOSE_CONTEXT; my_proto_tree_add_string(megaco_context_tree, hf_megaco_Context, tvb, tvb_previous_offset, 1, "Choose one"); if (check_col(pinfo->cinfo, COL_INFO) ) col_append_str(pinfo->cinfo, COL_INFO, " |=Choose one"); break; case '*': ctx_id = ALL_CONTEXTS; my_proto_tree_add_string(megaco_context_tree, hf_megaco_Context, tvb, tvb_previous_offset, 1, "All"); if (check_col(pinfo->cinfo, COL_INFO) ) col_append_str(pinfo->cinfo, COL_INFO, " |=All"); break; case '-': ctx_id = NULL_CONTEXT; proto_tree_add_text(megaco_context_tree, tvb, tvb_previous_offset, tokenlen, "Context: NULL" ); if (check_col(pinfo->cinfo, COL_INFO) ) col_append_str(pinfo->cinfo, COL_INFO, " |=NULL"); break; default: my_proto_tree_add_string(megaco_context_tree, hf_megaco_Context, tvb, tvb_previous_offset, tokenlen, tvb_format_text(tvb, tvb_previous_offset, tokenlen)); ctx_id = strtoul(tvb_format_text(tvb, tvb_previous_offset, tokenlen),NULL,10); if (check_col(pinfo->cinfo, COL_INFO) ) col_append_fstr(pinfo->cinfo, COL_INFO, " |=%s",tvb_format_text(tvb, tvb_previous_offset,tokenlen)); } ctx = gcp_ctx(msg,trx,ctx_id,keep_persistent_data); /* Find Commands */ /* If Transaction is is Request, Reply or Pending */ tvb_command_start_offset = megaco_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, '}'); len = tvb_previous_offset - tvb_command_start_offset; tvb_previous_offset = megaco_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{ len = tvb_current_offset - tvb_command_start_offset; tvb_current_offset = megaco_tvb_skip_wsp_return(tvb, tvb_current_offset -1); tokenlen = tvb_current_offset - tvb_command_start_offset; } } /* command includes descriptors */ else{ len = tvb_current_offset - tvb_command_start_offset; tvb_current_offset = megaco_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; tvb_previous_offset = tvb_command_start_offset; LBRKT_counter = 0; RBRKT_counter = 0; goto nextcontext; } sub_ti = proto_tree_add_text(megaco_tree, tvb, tvb_command_start_offset, len+1, "%s", tvb_format_text(tvb, tvb_command_start_offset, len+1)); megaco_tree_command_line = proto_item_add_subtree(sub_ti, ett_megaco_command_line); /* creation of the megaco_tree_command_line additionally Command and Transaction ID will be printed in this line */ /* Changed to use the lines above. this code is saved if there is complaints 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 = megaco_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 >= 'a')&& (tempchar <= 'z')) tempchar = tempchar - 0x20; if ( tempchar != 'E' ){ if ( tvb_get_guint8(tvb, 0 ) == '!'){ switch ( tempchar ){ case 'A': tempchar = tvb_get_guint8(tvb, tvb_command_start_offset+1); if ( (tempchar >= 'a')&& (tempchar <= 'z')) tempchar = tempchar - 0x20; switch ( tempchar ){ case 'V': switch(trx_type) { case GCP_TRX_REQUEST: cmd_type = GCP_CMD_AUDITVAL_REPLY; break; case GCP_TRX_REPLY: cmd_type = GCP_CMD_AUDITVAL_REQ; break; default: cmd_type = GCP_CMD_NONE; break; } my_proto_tree_add_string(megaco_tree_command_line, hf_megaco_command, tvb, tvb_command_start_offset, tokenlen, "AuditValue"); if (check_col(pinfo->cinfo, COL_INFO) ) col_append_str(pinfo->cinfo, COL_INFO, " AuditValue"); break; case 'C': switch(trx_type) { case GCP_TRX_REQUEST: cmd_type = GCP_CMD_AUDITCAP_REQ; break; case GCP_TRX_REPLY: cmd_type = GCP_CMD_AUDITCAP_REPLY; break; default: cmd_type = GCP_CMD_NONE; break; } my_proto_tree_add_string(megaco_tree_command_line, hf_megaco_command, tvb, tvb_command_start_offset, tokenlen, "AuditCapability"); if (check_col(pinfo->cinfo, COL_INFO) ) col_append_str(pinfo->cinfo, COL_INFO, " AuditCapability"); break; default: switch(trx_type) { case GCP_TRX_REQUEST: cmd_type = GCP_CMD_ADD_REQ; break; case GCP_TRX_REPLY: cmd_type = GCP_CMD_ADD_REPLY; break; default: cmd_type = GCP_CMD_NONE; break; } my_proto_tree_add_string(megaco_tree_command_line, hf_megaco_command, tvb, tvb_command_start_offset, tokenlen, "Add"); if (check_col(pinfo->cinfo, COL_INFO) ) col_append_str(pinfo->cinfo, COL_INFO, " Add"); break; } break; case 'N': switch(trx_type) { case GCP_TRX_REQUEST: cmd_type = GCP_CMD_NOTIFY_REQ; break; case GCP_TRX_REPLY: cmd_type = GCP_CMD_NOTIFY_REPLY; break; default: cmd_type = GCP_CMD_NONE; break; } my_proto_tree_add_string(megaco_tree_command_line, hf_megaco_command, tvb, tvb_command_start_offset, tokenlen, "Notify"); if (check_col(pinfo->cinfo, COL_INFO) ) col_append_str(pinfo->cinfo, COL_INFO, " Notify"); break; case 'M': tempchar = tvb_get_guint8(tvb, tvb_command_start_offset+1); if ( (tempchar >= 'a')&& (tempchar <= 'z')) tempchar = tempchar - 0x20; switch ( tempchar ){ case 'F': switch(trx_type) { case GCP_TRX_REQUEST: cmd_type = GCP_CMD_MOD_REQ; break; case GCP_TRX_REPLY: cmd_type = GCP_CMD_MOD_REPLY; break; default: cmd_type = GCP_CMD_NONE; break; } my_proto_tree_add_string(megaco_tree_command_line, hf_megaco_command, tvb, tvb_command_start_offset, tokenlen, "Modify"); if (check_col(pinfo->cinfo, COL_INFO) ) col_append_str(pinfo->cinfo, COL_INFO, " Modify"); break; case 'V': switch(trx_type) { case GCP_TRX_REQUEST: cmd_type = GCP_CMD_MOVE_REQ; break; case GCP_TRX_REPLY: cmd_type = GCP_CMD_MOVE_REPLY; break; default: cmd_type = GCP_CMD_NONE; break; } my_proto_tree_add_string(megaco_tree_command_line, hf_megaco_command, tvb, tvb_command_start_offset, tokenlen, "Move"); if (check_col(pinfo->cinfo, COL_INFO) ) col_append_str(pinfo->cinfo, COL_INFO, " Move"); break; } break; case 'P': cmd_type = GCP_CMD_NONE; /* PackagesToken = ("Packages" / "PG") PendingToken = ("Pending" / "PN") PriorityToken = ("Priority" / "PR") ProfileToken = ("Profile" / "PF") */ tempchar = tvb_get_guint8(tvb, tvb_command_start_offset+1); if ( (tempchar >= 'a')&& (tempchar <= 'z')) tempchar = tempchar - 0x20; switch ( tempchar ){ case 'G': my_proto_tree_add_string(megaco_tree_command_line, hf_megaco_command, tvb, tvb_command_start_offset, tokenlen, "Packages"); break; case 'N': my_proto_tree_add_string(megaco_tree_command_line, hf_megaco_command, tvb, tvb_command_start_offset, tokenlen, "Pending"); break; case 'R': my_proto_tree_add_string(megaco_tree_command_line, hf_megaco_command, tvb, tvb_command_start_offset, tokenlen, "Priority"); break; case 'F': my_proto_tree_add_string(megaco_tree_command_line, hf_megaco_command, tvb, tvb_command_start_offset, tokenlen, "Profile"); break; } break; case 'S': tempchar = tvb_get_guint8(tvb, tvb_command_start_offset+1); if ( (tempchar >= 'a')&& (tempchar <= 'z')) tempchar = tempchar - 0x20; switch ( tempchar ){ case 'C': switch(trx_type) { case GCP_TRX_REQUEST: cmd_type = GCP_CMD_SVCCHG_REQ; break; case GCP_TRX_REPLY: cmd_type = GCP_CMD_SVCCHG_REPLY; break; default: cmd_type = GCP_CMD_NONE; break; } my_proto_tree_add_string(megaco_tree_command_line, hf_megaco_command, tvb, tvb_command_start_offset, tokenlen, "ServiceChange"); break; default: switch(trx_type) { case GCP_TRX_REQUEST: cmd_type = GCP_CMD_SUB_REQ; break; case GCP_TRX_REPLY: cmd_type = GCP_CMD_SUB_REPLY; break; default: cmd_type = GCP_CMD_NONE; break; } my_proto_tree_add_string(megaco_tree_command_line, hf_megaco_command, tvb, tvb_command_start_offset, tokenlen, "Subtract"); if (check_col(pinfo->cinfo, COL_INFO) ) col_append_str(pinfo->cinfo, COL_INFO, " Subtract"); break; } break; default: tokenlen = (tvb_RBRKT+1) - tvb_previous_offset; tvb_ensure_bytes_exist(tvb, tvb_previous_offset, tokenlen); proto_tree_add_string(megaco_tree, hf_megaco_error_Frame, tvb, tvb_previous_offset, tokenlen, "No Command detectable !"); return; break; } } else{ gchar* command = tvb_format_text(tvb, tvb_command_start_offset, tokenlen); if ( g_str_equal(command,"Subtract") ) { switch(trx_type) { case GCP_TRX_REQUEST: cmd_type = GCP_CMD_SUB_REQ; break; case GCP_TRX_REPLY: cmd_type = GCP_CMD_SUB_REPLY; break; default: cmd_type = GCP_CMD_NONE; break; } } else if ( g_str_equal(command,"AuditValue") ) { switch(trx_type) { case GCP_TRX_REQUEST: cmd_type = GCP_CMD_AUDITVAL_REPLY; break; case GCP_TRX_REPLY: cmd_type = GCP_CMD_AUDITVAL_REQ; break; default: cmd_type = GCP_CMD_NONE; break; } } else if ( g_str_equal(command,"AuditCapability") ) { switch(trx_type) { case GCP_TRX_REQUEST: cmd_type = GCP_CMD_AUDITCAP_REQ; break; case GCP_TRX_REPLY: cmd_type = GCP_CMD_AUDITCAP_REPLY; break; default: cmd_type = GCP_CMD_NONE; break; } } else if ( g_str_equal(command,"Add") ) { switch(trx_type) { case GCP_TRX_REQUEST: cmd_type = GCP_CMD_ADD_REQ; break; case GCP_TRX_REPLY: cmd_type = GCP_CMD_ADD_REPLY; break; default: cmd_type = GCP_CMD_NONE; break; } } else if ( g_str_equal(command,"Notify") ) { switch(trx_type) { case GCP_TRX_REQUEST: cmd_type = GCP_CMD_NOTIFY_REQ; break; case GCP_TRX_REPLY: cmd_type = GCP_CMD_NOTIFY_REPLY; break; default: cmd_type = GCP_CMD_NONE; break; } } else if ( g_str_equal(command,"Modify") ) { switch(trx_type) { case GCP_TRX_REQUEST: cmd_type = GCP_CMD_MOD_REQ; break; case GCP_TRX_REPLY: cmd_type = GCP_CMD_MOD_REPLY; break; default: cmd_type = GCP_CMD_NONE; break; } } else if ( g_str_equal(command,"Move") ) { switch(trx_type) { case GCP_TRX_REQUEST: cmd_type = GCP_CMD_MOVE_REQ; break; case GCP_TRX_REPLY: cmd_type = GCP_CMD_MOVE_REPLY; break; default: cmd_type = GCP_CMD_NONE; break; } } else if ( g_str_equal(command,"ServiceChange") ) { switch(trx_type) { case GCP_TRX_REQUEST: cmd_type = GCP_CMD_SVCCHG_REQ; break; case GCP_TRX_REPLY: cmd_type = GCP_CMD_SVCCHG_REPLY; break; default: cmd_type = GCP_CMD_NONE; break; } } else if ( g_str_equal(command,"Subtract") ) { switch(trx_type) { case GCP_TRX_REQUEST: cmd_type = GCP_CMD_SUB_REQ; break; case GCP_TRX_REPLY: cmd_type = GCP_CMD_SUB_REPLY; break; default: cmd_type = GCP_CMD_NONE; break; } } else { switch(trx_type) { case GCP_TRX_REQUEST: cmd_type = GCP_CMD_OTHER_REQ; break; case GCP_TRX_REPLY: cmd_type = GCP_CMD_REPLY; break; default: cmd_type = GCP_CMD_NONE; break; } } 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)); if (check_col(pinfo->cinfo, COL_INFO) ) col_append_fstr(pinfo->cinfo, COL_INFO, " %s",command); } if (cmd_type == GCP_CMD_NONE && trx_type == GCP_TRX_REPLY) { cmd_type = GCP_CMD_REPLY; } if (cmd_type != GCP_CMD_NONE) { cmd = gcp_cmd(msg, trx, ctx, cmd_type, tvb_command_start_offset, keep_persistent_data); tap_queue_packet(megaco_tap, pinfo, cmd); } tvb_offset = tvb_find_guint8(tvb, tvb_command_start_offset, tvb_len, '='); tvb_offset = megaco_tvb_skip_wsp(tvb, tvb_offset+1); tokenlen = tvb_next_offset - tvb_offset; tempchar = tvb_get_guint8(tvb, tvb_offset); if ( (tempchar >= 'a')&& (tempchar <= 'z')) tempchar = tempchar - 0x20; term = ep_new0(gcp_term_t); wild_term = GCP_WILDCARD_NONE; term->type = GCP_TERM_TYPE_UNKNOWN; switch ( tempchar ){ case 'E': if ((tokenlen+1 > (int) sizeof(TermID)) || (tokenlen+1 <= 0)) { proto_tree_add_text(megaco_tree, tvb, 0, 0, "[ Parse error: Invalid TermID length (%d) ]", tokenlen+1); return; } tvb_get_nstringz0(tvb,tvb_offset,tokenlen+1,TermID); TermID[0] = 'e'; term->len = tokenlen; term->str = (gchar*)(term->buffer = TermID); term = gcp_cmd_add_term(msg, trx, cmd, term, wild_term, keep_persistent_data); /*** TERM ***/ my_proto_tree_add_string(megaco_tree_command_line, hf_megaco_termid, tvb, tvb_offset, tokenlen, TermID); break; case '*': wild_term = GCP_WILDCARD_ALL; term->len = 1; term->buffer = (guint8*)(term->str = "*"); term = gcp_cmd_add_term(msg, trx, cmd, term, wild_term, keep_persistent_data); my_proto_tree_add_string(megaco_tree_command_line, hf_megaco_termid, tvb, tvb_offset, tokenlen, "WildCard all"); if (check_col(pinfo->cinfo, COL_INFO) ) col_append_str(pinfo->cinfo, COL_INFO, "=*"); break; case '$': wild_term = GCP_WILDCARD_CHOOSE; term->len = 1; term->buffer = (guint8*)(term->str = "$"); term = gcp_cmd_add_term(msg, trx, cmd, term, wild_term, keep_persistent_data); my_proto_tree_add_string(megaco_tree_command_line, hf_megaco_termid, tvb, tvb_offset, tokenlen, "WildCard any"); if (check_col(pinfo->cinfo, COL_INFO) ) col_append_str(pinfo->cinfo, COL_INFO, "=$"); break; default: /*** TERM ***/ my_proto_tree_add_string(megaco_tree_command_line, hf_megaco_termid, tvb, tvb_offset, tokenlen, tvb_format_text(tvb, tvb_offset, tokenlen)); term->len = tokenlen; term->buffer = (guint8*)(term->str = tvb_format_text(tvb, tvb_offset, tokenlen)); term = gcp_cmd_add_term(msg, trx, cmd, term, wild_term, keep_persistent_data); if (check_col(pinfo->cinfo, COL_INFO) ) col_append_fstr(pinfo->cinfo, COL_INFO, "=%s",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'|| tempchar == 'e'){ dissect_megaco_descriptors(tvb, megaco_tree, pinfo, tvb_command_start_offset-1,tvb_descriptors_end_offset); } else { dissect_megaco_descriptors(tvb, megaco_tree, pinfo, tvb_descriptors_start_offset,tvb_descriptors_end_offset); } } RBRKT_counter = 0; LBRKT_counter = 0; tvb_command_start_offset = megaco_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 (keep_persistent_data) { gcp_msg_to_str(msg,keep_persistent_data); gcp_analyze_msg(megaco_tree, tvb, msg, &megaco_ctx_ids ); } if(global_megaco_raw_text){ tvb_raw_text_add(tvb, megaco_tree); } } #define MEGACO_MODEM_TOKEN 1 #define MEGACO_MUX_TOKEN 2 #define MEGACO_MEDIA_TOKEN 3 #define MEGACO_SIGNALS_TOKEN 4 #define MEGACO_SERVICES_TOKEN 5 #define MEGACO_STATS_TOKEN 6 #define MEGACO_ERROR_TOKEN 7 #define MEGACO_EVENTS_TOKEN 8 #define MEGACO_AUDIT_TOKEN 9 #define MEGACO_DIGITMAP_TOKEN 10 #define MEGACO_OE_TOKEN 11 #define MEGACO_TOPOLOGY_TOKEN 12 #define MEGACO_PACKAGES_TOKEN 13 static const megaco_tokens_t megaco_descriptors_names[] = { { "Unknown-token", NULL }, /* 0 Pad so that the real headers start at index 1 */ { "Modem", "MD" }, /* 1 */ { "Mux", "MX" }, /* 2 */ { "Media", "M" }, /* 3 */ { "Signals", "SG" }, /* 4 */ { "Services", "SV" }, /* 5 */ { "Statistics", "SA" }, /* 6 */ { "Error", "ER" }, /* 7 */ { "Events", "E" }, /* 8 */ { "Audit", "AT" }, /* 9 */ { "DigitMap", "DM" }, /* 10 */ { "ObservedEvents", "OE" }, /* 11 */ { "Topology", "TP" }, /* 12 */ { "Packages", "PG" }, /* 13 */ }; /* Returns index of megaco_tokens_t */ static gint find_megaco_descriptors_names(tvbuff_t *tvb, int offset, guint header_len) { guint i; for (i = 1; i < array_length(megaco_descriptors_names); i++) { if (header_len == strlen(megaco_descriptors_names[i].name) && tvb_strncaseeql(tvb, offset, megaco_descriptors_names[i].name, header_len) == 0) return i; if (megaco_descriptors_names[i].compact_name != NULL && header_len == strlen(megaco_descriptors_names[i].compact_name) && tvb_strncaseeql(tvb, offset, megaco_descriptors_names[i].compact_name, header_len) == 0) return i; } return -1; } 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, token_index, tvb_offset, temp_offset; gint tvb_current_offset,tvb_previous_offset,tokenlen; gint tvb_RBRKT, tvb_LBRKT, RBRKT_counter, LBRKT_counter; tvb_len = tvb_length(tvb); len = 0; tvb_RBRKT = 0; tvb_LBRKT = 0; RBRKT_counter = 0; LBRKT_counter = 0; tvb_LBRKT = megaco_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; } if (tvb_current_offset <= tvb_previous_offset) { proto_tree_add_text(megaco_tree_command_line, tvb, 0, 0, "[ Parse error: Invalid offset ]"); return; } /* 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 = megaco_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, '}'); } } /* Find token length */ for (tvb_offset=tvb_previous_offset; tvb_offset < tvb_len-1; tvb_offset++){ if (!isalpha(tvb_get_guint8(tvb, tvb_offset ))){ break; } } tokenlen = tvb_offset - tvb_previous_offset; token_index = find_megaco_descriptors_names(tvb, tvb_previous_offset, tokenlen); switch ( token_index ){ case MEGACO_MODEM_TOKEN: dissect_megaco_modemdescriptor(tvb, megaco_tree_command_line, tvb_RBRKT, tvb_previous_offset); break; case MEGACO_MUX_TOKEN: dissect_megaco_multiplexdescriptor(tvb, megaco_tree_command_line, tvb_RBRKT, tvb_previous_offset); break; case MEGACO_MEDIA_TOKEN: /*TODO: Move tis to the top when all branches fixed !!!*/ temp_offset = tvb_find_guint8(tvb, tvb_previous_offset,tvb_len, '{'); tokenlen = temp_offset - tvb_previous_offset+1; proto_tree_add_text(megaco_tree_command_line, tvb, tvb_previous_offset, tokenlen, "%s", tvb_format_text(tvb, tvb_previous_offset, tokenlen)); tvb_previous_offset = megaco_tvb_skip_wsp(tvb, temp_offset +1); dissect_megaco_mediadescriptor(tvb, megaco_tree_command_line, pinfo, tvb_RBRKT, tvb_previous_offset); break; case MEGACO_SIGNALS_TOKEN: dissect_megaco_signaldescriptor(tvb, pinfo, megaco_tree_command_line, tvb_RBRKT, tvb_previous_offset); break; case MEGACO_SERVICES_TOKEN: dissect_megaco_servicechangedescriptor(tvb, megaco_tree_command_line, tvb_RBRKT, tvb_previous_offset); break; case MEGACO_STATS_TOKEN: dissect_megaco_statisticsdescriptor(tvb, megaco_tree_command_line, tvb_RBRKT, tvb_previous_offset); break; case MEGACO_ERROR_TOKEN: dissect_megaco_errordescriptor(tvb, megaco_tree_command_line, tvb_RBRKT, tvb_previous_offset); break; case MEGACO_EVENTS_TOKEN: dissect_megaco_eventsdescriptor(tvb, pinfo, megaco_tree_command_line, tvb_RBRKT, tvb_previous_offset); break; case MEGACO_AUDIT_TOKEN: dissect_megaco_auditdescriptor(tvb, megaco_tree_command_line, pinfo, tvb_RBRKT, tvb_previous_offset); break; case MEGACO_DIGITMAP_TOKEN: dissect_megaco_digitmapdescriptor(tvb, megaco_tree_command_line, tvb_RBRKT, tvb_previous_offset); break; case MEGACO_OE_TOKEN: /* ObservedEventsToken */ dissect_megaco_observedeventsdescriptor(tvb, pinfo, megaco_tree_command_line, tvb_RBRKT, tvb_previous_offset); break; case MEGACO_TOPOLOGY_TOKEN: dissect_megaco_topologydescriptor(tvb, megaco_tree_command_line, tvb_RBRKT, tvb_previous_offset); break; case MEGACO_PACKAGES_TOKEN: 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 = megaco_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 ) */ #define MEGACO_LOCAL_TOKEN 1 #define MEGACO_REMOTE_TOKEN 2 #define MEGACO_LOCAL_CONTROL_TOKEN 3 #define MEGACO_STREAM_TOKEN 4 #define MEGACO_TERMINATION_STATE_DESC 5 static const megaco_tokens_t megaco_mediaParm_names[] = { { "Unknown-token", NULL }, /* 0 Pad so that the real headers start at index 1 */ { "Local", "L" }, /* 1 */ { "Remote", "R" }, /* 2 */ { "LocalControl", "O" }, /* 3 */ { "Stream", "ST" }, /* 4 */ { "TerminationState", "TS" }, /* 5 */ }; /* Returns index of megaco_tokens_t */ static gint find_megaco_mediaParm_names(tvbuff_t *tvb, int offset, guint header_len) { guint i; for (i = 1; i < array_length(megaco_mediaParm_names); i++) { if (header_len == strlen(megaco_mediaParm_names[i].name) && tvb_strncaseeql(tvb, offset, megaco_mediaParm_names[i].name, header_len) == 0) return i; if (megaco_mediaParm_names[i].compact_name != NULL && header_len == strlen(megaco_mediaParm_names[i].compact_name) && tvb_strncaseeql(tvb, offset, megaco_mediaParm_names[i].compact_name, header_len) == 0) return i; } return -1; } static void dissect_megaco_mediadescriptor(tvbuff_t *tvb, proto_tree *megaco_tree_command_line,packet_info *pinfo, gint tvb_last_RBRKT, gint tvb_previous_offset) { gint tokenlen, tvb_LBRKT, tvb_RBRKT; gint tvb_next_offset, tvb_current_offset, tvb_offset, equal_offset; gint mediaParm; proto_tree *megaco_mediadescriptor_tree, *megaco_mediadescriptor_ti; tokenlen = 0; tvb_next_offset = 0; tvb_current_offset = 0; tvb_offset = 0; /* 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); */ while ( tvb_previous_offset < tvb_last_RBRKT){ /* Start of token */ tvb_current_offset = megaco_tvb_skip_wsp(tvb, tvb_previous_offset); /* Find token length */ for (tvb_next_offset=tvb_current_offset; tvb_next_offset < tvb_last_RBRKT; tvb_next_offset++){ if (!isalpha(tvb_get_guint8(tvb, tvb_next_offset ))){ break; } } tokenlen = tvb_next_offset - tvb_current_offset; mediaParm = find_megaco_mediaParm_names(tvb, tvb_current_offset, tokenlen); tvb_LBRKT = tvb_find_guint8(tvb, tvb_next_offset , tvb_last_RBRKT, '{'); tvb_next_offset = tvb_find_guint8(tvb, tvb_current_offset+1 , tvb_last_RBRKT, '}'); tvb_RBRKT = tvb_next_offset; tokenlen = tvb_LBRKT - tvb_current_offset +1; megaco_mediadescriptor_ti = proto_tree_add_text(megaco_tree_command_line,tvb,tvb_current_offset, tokenlen,"%s",tvb_format_text(tvb, tvb_current_offset,tokenlen)); switch ( mediaParm ){ case MEGACO_LOCAL_TOKEN: tvb_current_offset = megaco_tvb_skip_wsp(tvb, tvb_LBRKT+1); dissect_megaco_Localdescriptor(tvb,megaco_tree_command_line , pinfo, tvb_RBRKT, tvb_current_offset); tvb_current_offset = tvb_RBRKT; break; case MEGACO_REMOTE_TOKEN: tvb_current_offset = megaco_tvb_skip_wsp(tvb, tvb_LBRKT+1); dissect_megaco_Localdescriptor(tvb,megaco_tree_command_line , pinfo, tvb_RBRKT, tvb_current_offset); tvb_current_offset = tvb_RBRKT; break; case MEGACO_LOCAL_CONTROL_TOKEN: tvb_current_offset = megaco_tvb_skip_wsp(tvb, tvb_LBRKT+1); dissect_megaco_LocalControldescriptor(tvb,megaco_tree_command_line, pinfo , tvb_RBRKT, tvb_current_offset); tvb_current_offset = tvb_RBRKT; break; case MEGACO_STREAM_TOKEN: megaco_mediadescriptor_tree = proto_item_add_subtree(megaco_mediadescriptor_ti, ett_megaco_mediadescriptor); equal_offset = tvb_find_guint8(tvb, tvb_previous_offset, tvb_last_RBRKT, '='); tvb_current_offset = megaco_tvb_skip_wsp(tvb, equal_offset+1); tvb_offset = megaco_tvb_skip_wsp_return(tvb, tvb_LBRKT-1); 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_previous_offset = tvb_LBRKT+1; continue; case MEGACO_TERMINATION_STATE_DESC: tvb_current_offset = megaco_tvb_skip_wsp(tvb, tvb_LBRKT+1); dissect_megaco_TerminationStatedescriptor(tvb,megaco_tree_command_line , tvb_RBRKT, tvb_current_offset); tvb_current_offset = tvb_RBRKT; break; default: break; }; /* more parameters ? */ tvb_next_offset = tvb_find_guint8(tvb, tvb_current_offset+1 , tvb_last_RBRKT, ','); if ( tvb_next_offset != -1){ tokenlen = tvb_next_offset - tvb_RBRKT+1; proto_tree_add_text(megaco_tree_command_line, tvb, tvb_RBRKT, tokenlen, "%s", tvb_format_text(tvb, tvb_RBRKT, tokenlen)); tvb_previous_offset = tvb_next_offset+1; }else{ /* Add the trailing '}'*/ proto_tree_add_text(megaco_tree_command_line, tvb, tvb_RBRKT, 1, "%s", tvb_format_text(tvb, tvb_RBRKT, 1)); tvb_previous_offset = tvb_last_RBRKT; } } /* End while */ } 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 = ep_alloc(10240); /*item=proto_tree_add_string(megaco_tree, hf_megaco_h245, tvb, offset, len, msg ); */ item = proto_tree_add_text(megaco_tree, tvb, offset, len, "%s", 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_h324_h223caprn(tvbuff_t *tvb, packet_info *pinfo, proto_tree *megaco_tree, gint offset _U_, gint len, gchar *msg) { guint8 *buf = ep_alloc(10240); asn1_ctx_t actx; /* 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 */ asn1_ctx_init(&actx, ASN1_ENC_PER, TRUE, pinfo); dissect_h245_H223Capability(h245_tvb, 0, &actx, megaco_tree, hf_megaco_h223Capability); } } 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_text(megaco_tree_command_line, tvb, tvb_previous_offset, tokenlen, "%s", tvb_format_text(tvb, tvb_previous_offset, tokenlen)); /* 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 = megaco_tvb_skip_wsp(tvb, tvb_current_offset +1); tvb_help_offset = megaco_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 = megaco_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 = megaco_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 = megaco_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 = megaco_tvb_skip_wsp(tvb, requested_event_start_offset +1); tempchar = tvb_get_guint8(tvb, tvb_help_offset); requested_event_start_offset = megaco_tvb_skip_wsp(tvb, requested_event_start_offset +1); requested_event_end_offset = megaco_tvb_skip_wsp_return(tvb, requested_event_end_offset-1); if ( tempchar == 'D' || 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_previous_offset = tvb_current_offset; 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_previous_offset ) { tvb_current_offset = tvb_events_end_offset; } tvb_previous_offset = megaco_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, pkg_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; tvb_signals_end_offset = tvb_RBRKT; tvb_signals_start_offset = tvb_previous_offset; if(toupper(tvb_get_guint8(tvb, tvb_previous_offset+1))=='G') tokenlen = 2; /* token is compact text (SG) */ else tokenlen = 7; /* token must be verbose text (Signals) */ tvb_current_offset = megaco_tvb_skip_wsp(tvb, tvb_previous_offset+tokenlen); if(tvb_get_guint8(tvb, tvb_current_offset)!='{') { /* {} has been omitted */ proto_tree_add_text(megaco_tree_command_line, tvb, tvb_signals_start_offset, tokenlen, "%s", "Empty Signal Descriptor"); if(check_col(pinfo->cinfo, COL_INFO)) col_append_str(pinfo->cinfo, COL_INFO, " (Signal:none)"); /* then say so */ return; /* and return */ } tvb_LBRKT = tvb_find_guint8(tvb, tvb_previous_offset, tvb_signals_end_offset, '{'); tokenlen = (tvb_LBRKT+1) - tvb_signals_start_offset; proto_tree_add_text(megaco_tree_command_line, tvb, tvb_signals_start_offset, tokenlen, "%s", tvb_format_text(tvb, tvb_signals_start_offset, tokenlen)); /* 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_LBRKT; tvb_next_offset = megaco_tvb_skip_wsp(tvb, tvb_current_offset+1); if (check_col(pinfo->cinfo, COL_INFO) ) col_append_fstr(pinfo->cinfo, COL_INFO, " (Signal:%s)",tvb_format_text(tvb, tvb_current_offset,tokenlen-tvb_current_offset+tvb_previous_offset)); if ( tvb_current_offset < tvb_signals_end_offset && 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 = megaco_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_LBRKT = 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 = megaco_tvb_skip_wsp_return(tvb, tvb_help_offset-1); pkg_tokenlen = tvb_help_offset - tvb_previous_offset; tokenlen = tvb_LBRKT+1 - tvb_previous_offset; } /* no parameters */ else { tokenlen = pkg_tokenlen = tvb_RBRKT+1 - tvb_previous_offset; } megaco_requestedsignal_ti = proto_tree_add_text(megaco_tree_command_line, tvb, tvb_previous_offset, tokenlen, "%s", tvb_format_text(tvb, tvb_previous_offset, tokenlen)); megaco_requestedsignal_tree = proto_item_add_subtree(megaco_requestedsignal_ti, ett_megaco_requestedsignal); proto_tree_add_item(megaco_requestedsignal_tree,hf_megaco_pkgdname,tvb,tvb_previous_offset,pkg_tokenlen, FALSE); if ( tvb_help_offset < tvb_RBRKT && tvb_help_offset != -1 ){ gchar *msg; requested_signal_start_offset = megaco_tvb_skip_wsp(tvb, requested_signal_start_offset +1); requested_signal_end_offset = megaco_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_tree_command_line, requested_signal_start_offset, tokenlen, msg); } else { proto_tree_add_text(megaco_tree_command_line, tvb, requested_signal_start_offset, tokenlen, "%s", msg); } /* Print the trailing '}' */ proto_tree_add_text(megaco_tree_command_line, tvb, tvb_RBRKT, 1, "%s", tvb_format_text(tvb, tvb_RBRKT, 1)); } 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_previous_offset){ tvb_current_offset = tvb_signals_end_offset; } tvb_previous_offset = megaco_tvb_skip_wsp(tvb, tvb_current_offset+1); tvb_LBRKT = tvb_previous_offset; tvb_RBRKT = tvb_previous_offset; /* Print the trailing '}' */ proto_tree_add_text(megaco_tree_command_line, tvb, tvb_signals_end_offset, 1, "%s", tvb_format_text(tvb, tvb_signals_end_offset, 1)); } while ( tvb_current_offset < tvb_signals_end_offset ); }else{ /* signals{}*/ proto_tree_add_text(megaco_tree_command_line, tvb, tvb_signals_end_offset, 1, "%s", tvb_format_text(tvb, tvb_signals_end_offset, 1)); } } static void dissect_megaco_auditdescriptor(tvbuff_t *tvb, proto_tree *megaco_tree, packet_info *pinfo, gint tvb_RBRKT, gint tvb_previous_offset) { gint tokenlen, tvb_LBRKT; /*proto_tree *megaco_auditdescriptor_tree, *megaco_auditdescriptor_ti;*/ tokenlen = 0; tvb_LBRKT = tvb_find_guint8(tvb, tvb_previous_offset, tvb_RBRKT, '{'); tokenlen = (tvb_LBRKT + 1) - tvb_previous_offset; proto_tree_add_text(megaco_tree, tvb, tvb_previous_offset, tokenlen, "%s", tvb_format_text(tvb, tvb_previous_offset, tokenlen)); /* 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 ( megaco_tvb_skip_wsp(tvb, tvb_previous_offset +1) != tvb_RBRKT ){ dissect_megaco_descriptors(tvb, megaco_tree, pinfo, tvb_previous_offset,tvb_RBRKT); }else{ proto_tree_add_text(megaco_tree, tvb, tvb_RBRKT, 1, "%s",tvb_format_text(tvb, tvb_RBRKT, 1)); } } /* * serviceChangeDescriptor = ServicesToken LBRKT serviceChangeParm * *(COMMA serviceChangeParm) RBRKT * * ServicesToken = ("Services" / "SV") * * serviceChangeParm = (serviceChangeMethod / serviceChangeReason / * serviceChangeDelay / serviceChangeAddress / * serviceChangeProfile / extension / TimeStamp / * serviceChangeMgcId / serviceChangeVersion ) * */ #define MEGACO_REASON_TOKEN 1 #define MEGACO_DELAY_TOKEN 2 #define MEGACO_SC_ADDR_TOKEN 3 #define MEGACO_MGC_ID_TOKEN 4 #define MEGACO_PROFILE_TOKEN 5 #define MEGACO_VERSION_TOKEN 6 #define MEGACO_METHOD_TOKEN 7 static const megaco_tokens_t megaco_serviceChangeParm_names[] = { { "Unknown-token", NULL }, /* 0 Pad so that the real headers start at index 1 */ /* streamMode */ { "Reason", "RE" }, /* 1 ReasonToken*/ { "Delay", "DL" }, /* 2 DelayToken */ { "ServiceChangeAddress", "AD" }, /* 3 ServiceChangeAddressToken */ { "MgcIdToTry", "MG" }, /* 4 MgcIdToken */ { "Profile", "PF" }, /* 5 ProfileToken */ { "Version", "V" }, /* 6 VersionToken */ { "Method", "MT" }, /* 7 MethodToken */ }; /* Returns index of megaco_tokens_t */ static gint find_megaco_megaco_serviceChangeParm_names(tvbuff_t *tvb, int offset, guint header_len) { guint i; for (i = 1; i < array_length(megaco_serviceChangeParm_names); i++) { if (header_len == strlen(megaco_serviceChangeParm_names[i].name) && tvb_strncaseeql(tvb, offset, megaco_serviceChangeParm_names[i].name, header_len) == 0) return i; if (megaco_serviceChangeParm_names[i].compact_name != NULL && header_len == strlen(megaco_serviceChangeParm_names[i].compact_name) && tvb_strncaseeql(tvb, offset, megaco_serviceChangeParm_names[i].compact_name, header_len) == 0) return i; } return -1; } /* * ServiceChangeReasons References * -------------------- ---------- */ static const value_string MEGACO_ServiceChangeReasons_vals[] = { {900, "Service Restored"}, {901, "Cold Boot"}, {902, "Warm Boot"}, {903, "MGC Directed Change"}, {904, "Termination malfunctioning"}, {905, "Termination taken out of service"}, {906, "Loss of lower layer connectivity (e.g. downstream sync)"}, {907, "Transmission Failure"}, {908, "MG Impending Failure"}, {909, "MGC Impending Failure"}, {910, "Media Capability Failure"}, {911, "Modem Capability Failure"}, {912, "Mux Capability Failure"}, {913, "Signal Capability Failure"}, {914, "Event Capability Failure"}, {915, "State Loss"}, {916, "Packages Change"}, {917, "Capabilities Change"}, {918, "Cancel Graceful"}, {919, "Warm Failover"}, {920, "Cold Failover"}, { 0, NULL } }; static void dissect_megaco_servicechangedescriptor(tvbuff_t *tvb, proto_tree *megaco_tree, gint tvb_RBRKT, gint tvb_previous_offset) { gint tokenlen, tvb_LBRKT, tvb_offset; gint token_index; gint tvb_current_offset; gboolean more_params = TRUE; proto_item* item; gint reason; guint8 ServiceChangeReason_str[4]; tvb_LBRKT = tvb_find_guint8(tvb, tvb_previous_offset, tvb_RBRKT, '{'); /* if (tvb_LBRKT == -1) return; */ tokenlen = (tvb_LBRKT + 1) - tvb_previous_offset; proto_tree_add_text(megaco_tree, tvb, tvb_previous_offset, tokenlen, "%s", tvb_format_text(tvb, tvb_previous_offset, tokenlen)); /* Start dissecting serviceChangeParm */ tvb_previous_offset = tvb_LBRKT + 1; while (more_params){ tvb_previous_offset = megaco_tvb_skip_wsp(tvb, tvb_previous_offset); /* Find token length */ for (tvb_offset=tvb_previous_offset; tvb_offset < tvb_RBRKT; tvb_offset++){ if (!isalpha(tvb_get_guint8(tvb, tvb_offset ))){ break; } } tokenlen = tvb_offset - tvb_previous_offset; token_index = find_megaco_megaco_serviceChangeParm_names(tvb, tvb_previous_offset, tokenlen); tvb_offset = tvb_find_guint8(tvb, tvb_offset, tvb_RBRKT, ','); if ((tvb_offset == -1)||(tvb_offset >=tvb_RBRKT)){ more_params = FALSE; tvb_offset = megaco_tvb_skip_wsp_return(tvb, tvb_RBRKT-1); } tokenlen = tvb_offset - tvb_previous_offset; if (more_params == TRUE ) /* Include ',' */ tokenlen++; switch(token_index){ case MEGACO_REASON_TOKEN: /* ReasonToken EQUAL VALUE * VALUE = quotedString / 1*(SafeChar) */ item = proto_tree_add_text(megaco_tree, tvb, tvb_previous_offset, tokenlen, "%s", tvb_format_text(tvb, tvb_previous_offset, tokenlen)); /* As the reason code ( if a digit ) can be in quoted string or 'just' digit * look for a nine and hope for the best. */ tvb_current_offset = tvb_find_guint8(tvb, tvb_previous_offset, tvb_RBRKT, '9'); if ( tvb_current_offset == -1) break; tvb_get_nstringz0(tvb,tvb_current_offset,4,ServiceChangeReason_str); reason = atoi(ServiceChangeReason_str); proto_item_append_text(item,"[ %s ]", val_to_str(reason, MEGACO_ServiceChangeReasons_vals,"Unknown (%u)")); break; case MEGACO_DELAY_TOKEN: case MEGACO_SC_ADDR_TOKEN: case MEGACO_MGC_ID_TOKEN: case MEGACO_PROFILE_TOKEN: case MEGACO_VERSION_TOKEN: case MEGACO_METHOD_TOKEN: /* No special dissection: fall trough */ default: /* Unknown or: * extension = extensionParameter parmValue * extensionParameter = "X" ("-" / "+") 1*6(ALPHA / DIGIT) */ proto_tree_add_text(megaco_tree, tvb, tvb_previous_offset, tokenlen, "%s", tvb_format_text(tvb, tvb_previous_offset, tokenlen)); break; } tvb_previous_offset = tvb_offset +1; }/*End while */ /* extension = extensionParameter parmValue * extensionParameter = "X" ("-" / "+") 1*6(ALPHA / DIGIT) */ /* 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)); */ proto_tree_add_text(megaco_tree, tvb, tvb_RBRKT, 1,"%s", tvb_format_text(tvb, tvb_RBRKT, 1)); } 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, pkg_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; tvb_LBRKT = tvb_find_guint8(tvb, tvb_previous_offset, tvb_RBRKT, '{'); tvb_next_offset = tvb_LBRKT; tokenlen = (tvb_next_offset+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); */ megaco_observedeventsdescriptor_ti = proto_tree_add_text(megaco_tree_command_line, tvb, tvb_previous_offset, tokenlen, "%s", tvb_format_text(tvb, tvb_previous_offset, tokenlen)); 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 = megaco_tvb_skip_wsp(tvb, tvb_current_offset +1); tvb_help_offset = megaco_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 = megaco_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 = megaco_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_LBRKT = 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 = megaco_tvb_skip_wsp_return(tvb, tvb_help_offset-1); pkg_tokenlen = tvb_help_offset - tvb_previous_offset; tokenlen = tvb_LBRKT+1 - tvb_previous_offset; } /* no parameters */ else { tokenlen = pkg_tokenlen = tvb_RBRKT+1 - tvb_previous_offset; } megaco_observedevent_ti = proto_tree_add_text(megaco_tree_command_line, tvb, tvb_previous_offset, tokenlen, "%s", tvb_format_text(tvb, tvb_previous_offset, tokenlen)); megaco_observedevent_tree = proto_item_add_subtree(megaco_observedevent_ti, ett_megaco_observedevent); proto_tree_add_item(megaco_observedevent_tree,hf_megaco_pkgdname,tvb,tvb_previous_offset,pkg_tokenlen, FALSE); if ( tvb_help_offset < tvb_RBRKT && tvb_help_offset != -1 ){ tvb_help_offset = megaco_tvb_skip_wsp(tvb, requested_event_start_offset +1); tempchar = tvb_get_guint8(tvb, tvb_help_offset); if ( (tempchar >= 'a')&& (tempchar <= 'z')) tempchar = tempchar - 0x20; requested_event_start_offset = megaco_tvb_skip_wsp(tvb, requested_event_start_offset +1)-1; requested_event_end_offset = megaco_tvb_skip_wsp_return(tvb, requested_event_end_offset-1); tvb_help_offset = requested_event_start_offset; do { gchar *msg; param_start_offset = megaco_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 = megaco_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_tree_command_line, param_start_offset, tokenlen, msg); } else { proto_tree_add_text(megaco_tree_command_line, tvb, param_start_offset, tokenlen, "%s", msg); } } while ( tvb_help_offset < requested_event_end_offset ); } tvb_previous_offset = tvb_current_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; } if (tvb_current_offset < tvb_previous_offset) { proto_tree_add_text(megaco_observedevent_tree, tvb, 0, 0, "[ Parse error: Invalid offset ]"); return; } tvb_previous_offset = megaco_tvb_skip_wsp(tvb, tvb_current_offset+1); tvb_LBRKT = tvb_previous_offset; tvb_RBRKT = tvb_previous_offset; /* Print the trailing '}' */ proto_tree_add_text(megaco_tree_command_line, tvb, tvb_observedevents_end_offset, 1, "%s", tvb_format_text(tvb, tvb_observedevents_end_offset, 1)); } 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 = megaco_tvb_skip_wsp(tvb, tvb_current_offset +1); tvb_help_offset = megaco_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 = megaco_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 = megaco_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 = megaco_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; proto_item* item; 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 = megaco_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)); item = 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)")); PROTO_ITEM_SET_GENERATED(item); } 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; guint8 tempchar; proto_tree *megaco_TerminationState_tree, *megaco_TerminationState_ti; tokenlen = 0; tvb_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); */ megaco_TerminationState_ti = proto_tree_add_text(megaco_mediadescriptor_tree, tvb, tvb_current_offset, tokenlen, "%s", tvb_format_text(tvb, tvb_current_offset, tokenlen)); 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_current_offset = megaco_tvb_skip_wsp(tvb, tvb_offset +1); if ( (tempchar >= 'a')&& (tempchar <= 'z')) tempchar = tempchar - 0x20; 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; if ( (tempchar >= 'a')&& (tempchar <= 'z')) tempchar = tempchar - 0x20; 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; if ( (tempchar >= 'a')&& (tempchar <= 'z')) tempchar = tempchar - 0x20; 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; if ( (tempchar >= 'a')&& (tempchar <= 'z')) tempchar = tempchar - 0x20; 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; } tokenlen = tvb_offset - tvb_current_offset; proto_tree_add_text(megaco_TerminationState_tree, tvb, tvb_current_offset, tokenlen, "%s", tvb_format_text(tvb,tvb_current_offset,tokenlen)); break; } tvb_current_offset = megaco_tvb_skip_wsp(tvb, tvb_offset +1); tvb_offset = tvb_find_guint8(tvb, tvb_current_offset , tvb_next_offset, '='); } proto_tree_add_text(megaco_mediadescriptor_tree, tvb, tvb_next_offset, 1, "%s", tvb_format_text(tvb, tvb_next_offset, 1)); } 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_ti = proto_tree_add_text(megaco_mediadescriptor_tree, tvb, tvb_current_offset, tokenlen, "%s", tvb_format_text(tvb, tvb_current_offset, tokenlen)); 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); } } /* * localControlDescriptor = LocalControlToken LBRKT localParm * *(COMMA localParm) RBRKT * ; at-most-once per item * localParm = ( streamMode / propertyParm / reservedValueMode / reservedGroupMode ) */ #define MEGACO_MODETOKEN 1 #define MEGACO_RESERVEDVALUETOKEN 2 #define MEGACO_RESERVEDGROUPTOKEN 3 #define MEGACO_H324_H223CAPR 4 #define MEGACO_H324_MUXTBL_IN 5 #define MEGACO_H324_MUXTBL_OUT 6 #define MEGACO_DS_DSCP 7 #define MEGACO_GM_SAF 8 #define MEGACO_GM_SAM 9 #define MEGACO_GM_SPF 10 #define MEGACO_GM_SPR 11 #define MEGACO_GM_ESAS 12 #define MEGACO_GM_LSA 13 #define MEGACO_GM_ESPS 14 #define MEGACO_GM_LSP 15 #define MEGACO_GM_RSB 16 static const megaco_tokens_t megaco_localParam_names[] = { { "Unknown-token", NULL }, /* 0 Pad so that the real headers start at index 1 */ /* streamMode */ { "Mode", "MO" }, /* 1 */ { "ReservedValue", "RV" }, /* 2 */ { "ReservedGroup", "RG" }, /* 3 */ /* propertyParm = pkgdName parmValue * Add more package names as needed. */ { "h324/h223capr", NULL }, /* 4 */ { "h324/muxtbl_in", NULL }, /* 5 */ { "h324/muxtbl_out", NULL }, /* 6 */ { "ds/dscp", NULL }, /* 7 */ { "gm/saf", NULL }, /* 8 */ { "gm/sam", NULL }, /* 9 */ { "gm/spf", NULL }, /* 10 */ { "gm/spr", NULL }, /* 11 */ { "gm/esas", NULL }, /* 12 */ { "gm/lsa", NULL }, /* 13 */ { "gm/esps", NULL }, /* 14 */ { "gm/lsp", NULL }, /* 15 */ { "gm/rsb", NULL }, /* 16 */ }; /* Returns index of megaco_tokens_t */ static gint find_megaco_localParam_names(tvbuff_t *tvb, int offset, guint header_len) { guint i; for (i = 1; i < array_length(megaco_localParam_names); i++) { if (header_len == strlen(megaco_localParam_names[i].name) && tvb_strncaseeql(tvb, offset, megaco_localParam_names[i].name, header_len) == 0) return i; if (megaco_localParam_names[i].compact_name != NULL && header_len == strlen(megaco_localParam_names[i].compact_name) && tvb_strncaseeql(tvb, offset, megaco_localParam_names[i].compact_name, header_len) == 0) return i; } return -1; } static void dissect_megaco_LocalControldescriptor(tvbuff_t *tvb, proto_tree *megaco_mediadescriptor_tree, packet_info *pinfo, gint tvb_next_offset, gint tvb_current_offset) { gint tokenlen; guint token_name_len; gint tvb_offset,tvb_help_offset; gint token_index = 0; gchar *msg; proto_item* item; guint8 code_str[3]; /*proto_tree *megaco_LocalControl_tree, *megaco_LocalControl_ti; */ tokenlen = 0; tvb_offset = 0; tvb_help_offset = 0; 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 ){ tvb_help_offset = tvb_current_offset; /* * Find local parameter name * localParm = ( streamMode / propertyParm / reservedValueMode / reservedGroupMode ) * pkgdName = (PackageName SLASH ItemID) ;specific item * / (PackageName SLASH "*") ;all events in package * / ("*" SLASH "*") ; all events supported by the MG */ /* Find token length */ for (tvb_offset=tvb_current_offset; tvb_offset < tvb_next_offset; tvb_offset++){ guint8 octet; octet = tvb_get_guint8(tvb, tvb_offset); if (!isalnum(octet)){ if ((octet!='/')&&(octet!='_')){ break; } } } token_name_len = tvb_offset - tvb_current_offset; /* Debug Code proto_tree_add_text(megaco_LocalControl_tree, tvb, tvb_current_offset, token_name_len, "%s", tvb_format_text(tvb,tvb_current_offset,token_name_len)); */ token_index = find_megaco_localParam_names(tvb, tvb_current_offset, token_name_len); /* Find start of parameter value */ tvb_offset = tvb_find_guint8(tvb, tvb_offset , tvb_next_offset, '='); if (tvb_offset == -1) THROW(ReportedBoundsError); /* Start search after '=' in case there is no SP*/ tvb_offset++; tvb_current_offset = megaco_tvb_skip_wsp(tvb, tvb_offset); /* find if there are more parameters or not */ tvb_offset = tvb_find_guint8(tvb, tvb_current_offset , tvb_offset, ','); if ( tvb_offset < 0 || tvb_offset > tvb_next_offset ){ tvb_offset = tvb_next_offset; } tokenlen = megaco_tvb_skip_wsp_return(tvb,tvb_offset-1) - tvb_current_offset; /* Debug Code proto_tree_add_text(megaco_LocalControl_tree, tvb, tvb_current_offset, tokenlen, "%s", tvb_format_text(tvb,tvb_current_offset,tokenlen)); */ switch ( token_index ){ case MEGACO_MODETOKEN: /* Mode */ proto_tree_add_string(megaco_mediadescriptor_tree, hf_megaco_mode, tvb, tvb_current_offset, tokenlen, tvb_format_text(tvb, tvb_current_offset, tokenlen)); if (check_col(pinfo->cinfo, COL_INFO) ) col_append_fstr(pinfo->cinfo, COL_INFO, " (Mode:%s)",tvb_format_text(tvb, tvb_current_offset,tokenlen)); tvb_current_offset = megaco_tvb_skip_wsp(tvb, tvb_offset +1); break; case MEGACO_RESERVEDVALUETOKEN: /* ReservedValue */ proto_tree_add_string(megaco_mediadescriptor_tree, hf_megaco_reserve_value, tvb, tvb_current_offset, tokenlen, tvb_format_text(tvb, tvb_current_offset, tokenlen)); tvb_current_offset = megaco_tvb_skip_wsp(tvb, tvb_offset +1); break; case MEGACO_RESERVEDGROUPTOKEN: /* ReservedGroup */ proto_tree_add_string(megaco_mediadescriptor_tree, hf_megaco_reserve_group, tvb, tvb_current_offset, tokenlen, tvb_format_text(tvb, tvb_current_offset, tokenlen)); tvb_current_offset = megaco_tvb_skip_wsp(tvb, tvb_offset +1); break; case MEGACO_H324_H223CAPR: /* h324/h223capr */ proto_tree_add_string(megaco_mediadescriptor_tree, hf_megaco_h324_h223capr, tvb, tvb_current_offset, tokenlen, tvb_format_text(tvb, tvb_current_offset, tokenlen)); tvb_current_offset = megaco_tvb_skip_wsp(tvb, tvb_offset +1); tokenlen = tvb_offset - tvb_help_offset; msg=tvb_format_text(tvb,tvb_help_offset, tokenlen); dissect_megaco_h324_h223caprn(tvb, pinfo, megaco_mediadescriptor_tree, tvb_help_offset, tokenlen, msg); break; case MEGACO_H324_MUXTBL_IN: /* h324/muxtbl_in */ proto_tree_add_string(megaco_mediadescriptor_tree, hf_megaco_h324_muxtbl_in, tvb, tvb_current_offset, tokenlen, tvb_format_text(tvb, tvb_current_offset, tokenlen)); tvb_current_offset = megaco_tvb_skip_wsp(tvb, tvb_offset +1); tokenlen = tvb_offset - tvb_help_offset; msg=tvb_format_text(tvb,tvb_help_offset, tokenlen); /* Call the existing rotine with tree = NULL to avoid an entry to the tree */ dissect_megaco_h245(tvb, pinfo, NULL, tvb_help_offset, tokenlen, msg); break; case MEGACO_H324_MUXTBL_OUT: proto_tree_add_string(megaco_mediadescriptor_tree, hf_megaco_h324_muxtbl_out, tvb, tvb_current_offset, tokenlen, tvb_format_text(tvb, tvb_current_offset, tokenlen)); tvb_current_offset = megaco_tvb_skip_wsp(tvb, tvb_offset +1); tokenlen = tvb_offset - tvb_help_offset; msg=tvb_format_text(tvb,tvb_help_offset, tokenlen); /* Call the existing rotine with tree = NULL to avoid an entry to the tree */ dissect_megaco_h245(tvb, pinfo, NULL, tvb_help_offset, tokenlen, msg); break; case MEGACO_DS_DSCP: item = proto_tree_add_string(megaco_mediadescriptor_tree, hf_megaco_ds_dscp, tvb, tvb_current_offset, tokenlen, tvb_format_text(tvb, tvb_current_offset, tokenlen)); tvb_get_nstringz0(tvb,tvb_current_offset,3,code_str); proto_item_append_text(item,"[ %s ]", val_to_str(strtoul(code_str,NULL,16), dscp_vals,"Unknown (%u)")); tvb_current_offset = megaco_tvb_skip_wsp(tvb, tvb_offset +1); break; case MEGACO_GM_SAF: tokenlen = tvb_offset - tvb_help_offset; item = proto_tree_add_text(megaco_mediadescriptor_tree, tvb, tvb_help_offset, tokenlen, "%s", tvb_format_text(tvb,tvb_help_offset, tokenlen)); proto_item_append_text(item," [Remote Source Address Filtering]"); tvb_current_offset = megaco_tvb_skip_wsp(tvb, tvb_offset +1); break; case MEGACO_GM_SAM: tokenlen = tvb_offset - tvb_help_offset; item = proto_tree_add_text(megaco_mediadescriptor_tree, tvb, tvb_help_offset, tokenlen, "%s", tvb_format_text(tvb,tvb_help_offset, tokenlen)); proto_item_append_text(item," [Remote Source Address Mask]"); tvb_current_offset = megaco_tvb_skip_wsp(tvb, tvb_offset +1); break; case MEGACO_GM_SPF: tokenlen = tvb_offset - tvb_help_offset; item = proto_tree_add_text(megaco_mediadescriptor_tree, tvb, tvb_help_offset, tokenlen, "%s", tvb_format_text(tvb,tvb_help_offset, tokenlen)); proto_item_append_text(item," [Remote Source Port Filtering]"); tvb_current_offset = megaco_tvb_skip_wsp(tvb, tvb_offset +1); break; case MEGACO_GM_SPR: tokenlen = tvb_offset - tvb_help_offset; item = proto_tree_add_text(megaco_mediadescriptor_tree, tvb, tvb_help_offset, tokenlen, "%s", tvb_format_text(tvb,tvb_help_offset, tokenlen)); proto_item_append_text(item," [Remote Source Port Range]"); tvb_current_offset = megaco_tvb_skip_wsp(tvb, tvb_offset +1); break; case MEGACO_GM_ESAS: tokenlen = tvb_offset - tvb_help_offset; item = proto_tree_add_text(megaco_mediadescriptor_tree, tvb, tvb_help_offset, tokenlen, "%s", tvb_format_text(tvb,tvb_help_offset, tokenlen)); proto_item_append_text(item," [Explicit Source Address Setting]"); tvb_current_offset = megaco_tvb_skip_wsp(tvb, tvb_offset +1); break; default: tokenlen = tvb_offset - tvb_help_offset; proto_tree_add_text(megaco_mediadescriptor_tree, tvb, tvb_help_offset, tokenlen, "%s", tvb_format_text(tvb,tvb_help_offset, tokenlen)); tvb_current_offset = megaco_tvb_skip_wsp(tvb, tvb_offset +1); break; } } } /* 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); proto_tree_add_text(tree, tvb, 0, -1,"-------------- (RAW text output) ---------------"); do { linelen = tvb_find_line_end(tvb,tvb_linebegin,-1,&tvb_lineend,FALSE); proto_tree_add_text(tree, tvb, tvb_linebegin, linelen, "%s", tvb_format_text_wsp(tvb,tvb_linebegin, linelen)); tvb_linebegin = tvb_lineend; } while ( tvb_lineend < tvb_len ); } /* Register all the bits needed with the filtering engine */ /* 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"); h248_handle = find_dissector("h248"); data_handle = find_dissector("data"); 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); } /* Set our port number for future use */ txt_tcp_port = global_megaco_txt_tcp_port; txt_udp_port = global_megaco_txt_udp_port; 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); dissector_add("sctp.ppi", H248_PAYLOAD_PROTOCOL_ID, megaco_text_handle); } 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_h324_muxtbl_in, { "h324/muxtbl_in", "megaco.h324_muxtbl_in", FT_STRING, BASE_DEC, NULL, 0x0, "h324/muxtbl_in", HFILL }}, { &hf_megaco_h324_muxtbl_out, { "h324/muxtbl_out", "megaco.h324_muxtbl_out", FT_STRING, BASE_DEC, NULL, 0x0, "h324/muxtbl_out", HFILL }}, { &hf_megaco_ds_dscp, { "ds/dscp", "megaco.ds_dscp", FT_STRING, BASE_DEC, NULL, 0x0, "ds/dscp Differentiated Services Code Point", HFILL }}, { &hf_megaco_h324_h223capr, { "h324/h223capr", "megaco._h324_h223capr", FT_STRING, BASE_DEC, NULL, 0x0, "h324/h223capr", 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 }}, { &hf_megaco_h223Capability, { "h223Capability", "megaco.h245.h223Capability", FT_NONE, BASE_NONE, NULL, 0, "megaco.h245.H223Capability", HFILL }}, GCP_HF_ARR_ELEMS("megaco",megaco_ctx_ids), /* Add more fields here */ }; static gint *ett[] = { &ett_megaco, &ett_megaco_message, &ett_megaco_message_body, &ett_megaco_context, &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, GCP_ETT_ARR_ELEMS(megaco_ctx_ids), }; module_t *megaco_module; proto_megaco = proto_register_protocol("MEGACO", "MEGACO", "megaco"); register_dissector("megaco", dissect_megaco_text, proto_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); prefs_register_bool_preference(megaco_module, "ctx_info", "Track Context", "Mantain relationships between transactions and contexts and display an extra tree showing context data", &keep_persistent_data); megaco_tap = register_tap("megaco"); } /* * megaco_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 megaco_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' || tempchar == '\r'); counter++); return (counter); } static gint megaco_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' || tempchar == '\r'); counter--); counter++; return (counter); }