text: // SoftEther VPN Source Code - Developer Edition Master Branch
  // Cedar Communication Module
  // 
  // SoftEther VPN Server, Client and Bridge are free software under GPLv2.
  // 
  // Copyright (c) Daiyuu Nobori.
  // Copyright (c) SoftEther VPN Project, University of Tsukuba, Japan.
  // Copyright (c) SoftEther Corporation.
  // 
  // All Rights Reserved.
  // 
  // http://www.softether.org/
  // 
  // Author: Daiyuu Nobori, Ph.D.
  // Comments: Tetsuo Sugiyama, Ph.D.
  // 
  // This program is free software; you can redistribute it and/or
  // modify it under the terms of the GNU General Public License
  // version 2 as published by the Free Software Foundation.
  // 
  // 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 version 2
  // along with this program; if not, write to the Free Software
  // Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
  // 
  // THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
  // EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
  // MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
  // IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY
  // CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,
  // TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE
  // SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
  // 
  // THE LICENSE AGREEMENT IS ATTACHED ON THE SOURCE-CODE PACKAGE
  // AS "LICENSE.TXT" FILE. READ THE TEXT FILE IN ADVANCE TO USE THE SOFTWARE.
  // 
  // 
  // THIS SOFTWARE IS DEVELOPED IN JAPAN, AND DISTRIBUTED FROM JAPAN,
  // UNDER JAPANESE LAWS. YOU MUST AGREE IN ADVANCE TO USE, COPY, MODIFY,
  // MERGE, PUBLISH, DISTRIBUTE, SUBLICENSE, AND/OR SELL COPIES OF THIS
  // SOFTWARE, THAT ANY JURIDICAL DISPUTES WHICH ARE CONCERNED TO THIS
  // SOFTWARE OR ITS CONTENTS, AGAINST US (SOFTETHER PROJECT, SOFTETHER
  // CORPORATION, DAIYUU NOBORI OR OTHER SUPPLIERS), OR ANY JURIDICAL
  // DISPUTES AGAINST US WHICH ARE CAUSED BY ANY KIND OF USING, COPYING,
  // MODIFYING, MERGING, PUBLISHING, DISTRIBUTING, SUBLICENSING, AND/OR
  // SELLING COPIES OF THIS SOFTWARE SHALL BE REGARDED AS BE CONSTRUED AND
  // CONTROLLED BY JAPANESE LAWS, AND YOU MUST FURTHER CONSENT TO
  // EXCLUSIVE JURISDICTION AND VENUE IN THE COURTS SITTING IN TOKYO,
  // JAPAN. YOU MUST WAIVE ALL DEFENSES OF LACK OF PERSONAL JURISDICTION
  // AND FORUM NON CONVENIENS. PROCESS MAY BE SERVED ON EITHER PARTY IN
  // THE MANNER AUTHORIZED BY APPLICABLE LAW OR COURT RULE.
  // 
  // USE ONLY IN JAPAN. DO NOT USE THIS SOFTWARE IN ANOTHER COUNTRY UNLESS
  // YOU HAVE A CONFIRMATION THAT THIS SOFTWARE DOES NOT VIOLATE ANY
  // CRIMINAL LAWS OR CIVIL RIGHTS IN THAT PARTICULAR COUNTRY. USING THIS
  // SOFTWARE IN OTHER COUNTRIES IS COMPLETELY AT YOUR OWN RISK. THE
  // SOFTETHER VPN PROJECT HAS DEVELOPED AND DISTRIBUTED THIS SOFTWARE TO
  // COMPLY ONLY WITH THE JAPANESE LAWS AND EXISTING CIVIL RIGHTS INCLUDING
  // PATENTS WHICH ARE SUBJECTS APPLY IN JAPAN. OTHER COUNTRIES' LAWS OR
  // CIVIL RIGHTS ARE NONE OF OUR CONCERNS NOR RESPONSIBILITIES. WE HAVE
  // NEVER INVESTIGATED ANY CRIMINAL REGULATIONS, CIVIL LAWS OR
  // INTELLECTUAL PROPERTY RIGHTS INCLUDING PATENTS IN ANY OF OTHER 200+
  // COUNTRIES AND TERRITORIES. BY NATURE, THERE ARE 200+ REGIONS IN THE
  // WORLD, WITH DIFFERENT LAWS. IT IS IMPOSSIBLE TO VERIFY EVERY
  // COUNTRIES' LAWS, REGULATIONS AND CIVIL RIGHTS TO MAKE THE SOFTWARE
  // COMPLY WITH ALL COUNTRIES' LAWS BY THE PROJECT. EVEN IF YOU WILL BE
  // SUED BY A PRIVATE ENTITY OR BE DAMAGED BY A PUBLIC SERVANT IN YOUR
  // COUNTRY, THE DEVELOPERS OF THIS SOFTWARE WILL NEVER BE LIABLE TO
  // RECOVER OR COMPENSATE SUCH DAMAGES, CRIMINAL OR CIVIL
  // RESPONSIBILITIES. NOTE THAT THIS LINE IS NOT LICENSE RESTRICTION BUT
  // JUST A STATEMENT FOR WARNING AND DISCLAIMER.
  // 
  // 
  // SOURCE CODE CONTRIBUTION
  // ------------------------
  // 
  // Your contribution to SoftEther VPN Project is much appreciated.
  // Please send patches to us through GitHub.
  // Read the SoftEther VPN Patch Acceptance Policy in advance:
  // http://www.softether.org/5-download/src/9.patch
  // 
  // 
  // DEAR SECURITY EXPERTS
  // ---------------------
  // 
  // If you find a bug or a security vulnerability please kindly inform us
  // about the problem immediately so that we can fix the security problem
  // to protect a lot of users around the world as soon as possible.
  // 
  // Our e-mail address for security reports is:
  // softether-vpn-security [at] softether.org
  // 
  // Please note that the above e-mail address is not a technical support
  // inquiry address. If you need technical assistance, please visit
  // http://www.softether.org/ and ask your question on the users forum.
  // 
  // Thank you for your cooperation.
  // 
  // 
  // NO MEMORY OR RESOURCE LEAKS
  // ---------------------------
  // 
  // The memory-leaks and resource-leaks verification under the stress
  // test has been passed before release this source code.
  
  
  // AzureClient.c
  // VPN Azure Client
  
  #include "CedarPch.h"
  
  // Wait for connection request
  void AcWaitForRequest(AZURE_CLIENT *ac, SOCK *s, AZURE_PARAM *param)
  {
  	// Validate arguments
  	if (ac == NULL || s == NULL || param == NULL)
  	{
  		return;
  	}
  
  	while (ac->Halt == false)
  	{
  		UCHAR uc;
  
  		// Receive 1 byte
  		if (RecvAll(s, &uc, 1, false) == 0)
  		{
  			break;
  		}
  
  		if (uc != 0)
  		{
  			// Receive a Pack
  			PACK *p = RecvPackWithHash(s);
  
  			if (p == NULL)
  			{
  				break;
  			}
  			else
  			{
  				// Verify contents of Pack
  				char opcode[MAX_SIZE];
  				char cipher_name[MAX_SIZE];
  				char hostname[MAX_SIZE];
  
  				PackGetStr(p, "opcode", opcode, sizeof(opcode));
  				PackGetStr(p, "cipher_name", cipher_name, sizeof(cipher_name));
  				PackGetStr(p, "hostname", hostname, sizeof(hostname));
  
  				if (StrCmpi(opcode, "relay") == 0)
  				{
  					IP client_ip, server_ip;
  					UINT client_port;
  					UINT server_port;
  					UCHAR session_id[SHA1_SIZE];
  
  					if (PackGetIp(p, "client_ip", &client_ip) &&
  						PackGetIp(p, "server_ip", &server_ip) &&
  						PackGetData2(p, "session_id", session_id, sizeof(session_id)))
  					{
  						client_port = PackGetInt(p, "client_port");
  						server_port = PackGetInt(p, "server_port");
  
  						if (client_port != 0 && server_port != 0)
  						{
  							SOCK *ns;
  							Debug("Connect Request from %r:%u\n", &client_ip, client_port);
  
  							// Create new socket and connect VPN Azure Server
  							if (ac->DDnsStatusCopy.InternetSetting.ProxyType == PROXY_DIRECT)
  							{
  								ns = ConnectEx2(ac->DDnsStatusCopy.CurrentAzureIp, AZURE_SERVER_PORT,
  									0, (bool *)&ac->Halt);
  							}
  							else
  							{
  								ns = WpcSockConnect2(ac->DDnsStatusCopy.CurrentAzureIp, AZURE_SERVER_PORT,
  									&ac->DDnsStatusCopy.InternetSetting, NULL, AZURE_VIA_PROXY_TIMEOUT);
  							}
  
  							if (ns == NULL)
  							{
  								Debug("Connect Error.\n");
  							}
  							else
  							{
  								Debug("Connected to the relay server.\n");
  
  								SetTimeout(ns, param->DataTimeout);
  
  								if (StartSSLEx(ns, NULL, NULL, true, 0, NULL))
  								{
  									// Check certification
  									char server_cert_hash_str[MAX_SIZE];
  									UCHAR server_cert_hash[SHA1_SIZE];
  
  									Zero(server_cert_hash, sizeof(server_cert_hash));
  									GetXDigest(ns->RemoteX, server_cert_hash, true);
  
  									BinToStr(server_cert_hash_str, sizeof(server_cert_hash_str),
  										server_cert_hash, SHA1_SIZE);
  
  									if (IsEmptyStr(ac->DDnsStatusCopy.AzureCertHash) || StrCmpi(server_cert_hash_str, ac->DDnsStatusCopy.AzureCertHash) == 0
  										 || StrCmpi(server_cert_hash_str, ac->DDnsStatus.AzureCertHash) == 0)
  									{
  										if (SendAll(ns, AZURE_PROTOCOL_DATA_SIANGTURE, 24, true))
  										{
  											PACK *p2 = NewPack();
  
  											PackAddStr(p2, "hostname", hostname);
  											PackAddData(p2, "session_id", session_id, sizeof(session_id));
  
  											if (SendPackWithHash(ns, p2))
  											{
  												UCHAR uc;
  
  												if (RecvAll(ns, &uc, 1, true) != false)
  												{
  													if (uc != 0)
  													{
  														SOCK *accept_sock = GetReverseListeningSock(ac->Cedar);
  
  														if (accept_sock != NULL)
  														{
  															AddRef(ns->ref);
  
  															SetTimeout(ns, INFINITE);
  
  															Copy(&ns->Reverse_MyServerGlobalIp, &server_ip, sizeof(IP));
  															ns->Reverse_MyServerPort = server_port;
  
  															InjectNewReverseSocketToAccept(accept_sock, ns,
  																&client_ip, client_port);
  
  															ReleaseSock(accept_sock);
  														}
  													}
  												}
  											}
  
  											FreePack(p2);
  										}
  									}
  								}
  
  								ReleaseSock(ns);
  							}
  						}
  					}
  				}
  
  				FreePack(p);
  			}
  		}
  
  		// Send 1 byte
  		uc = 0;
  		if (SendAll(s, &uc, 1, false) == 0)
  		{
  			break;
  		}
  	}
  }
  
  // VPN Azure client main thread
  void AcMainThread(THREAD *thread, void *param)
  {
  	AZURE_CLIENT *ac = (AZURE_CLIENT *)param;
  	UINT last_ip_revision = INFINITE;
  	UINT64 last_reconnect_tick = 0;
  	UINT64 next_reconnect_interval = AZURE_CONNECT_INITIAL_RETRY_INTERVAL;
  	UINT num_reconnect_retry = 0;
  	UINT64 next_ddns_retry_tick = 0;
  	bool last_connect_ok = false;
  	// Validate arguments
  	if (ac == NULL || thread == NULL)
  	{
  		return;
  	}
  
  	while (ac->Halt == false)
  	{
  		UINT64 now = Tick64();
  		bool connect_was_ok = false;
  		// Wait for enabling VPN Azure function
  		if (ac->IsEnabled)
  		{
  			// VPN Azure is enabled
  			DDNS_CLIENT_STATUS st;
  			bool connect_now = false;
  			bool azure_ip_changed = false;
  
  			Lock(ac->Lock);
  			{
  				Copy(&st, &ac->DDnsStatus, sizeof(DDNS_CLIENT_STATUS));
  
  				if (StrCmpi(st.CurrentAzureIp, ac->DDnsStatusCopy.CurrentAzureIp) != 0)
  				{
  					if (IsEmptyStr(st.CurrentAzureIp) == false)
  					{
  						// Destination IP address is changed
  						connect_now = true;
  						num_reconnect_retry = 0;
  					}
  				}
  
  				if (StrCmpi(st.CurrentHostName, ac->DDnsStatusCopy.CurrentHostName) != 0)
  				{
  					// DDNS host name is changed
  					connect_now = true;
  					num_reconnect_retry = 0;
  				}
  
  				Copy(&ac->DDnsStatusCopy, &st, sizeof(DDNS_CLIENT_STATUS));
  			}
  			Unlock(ac->Lock);
  
  			if (last_ip_revision != ac->IpStatusRevision)
  			{
  				last_ip_revision = ac->IpStatusRevision;
  
  				connect_now = true;
  
  				num_reconnect_retry = 0;
  			}
  
  			if (last_reconnect_tick == 0 || (now >= (last_reconnect_tick + next_reconnect_interval)))
  			{
  				UINT r;
  
  				last_reconnect_tick = now;
  				num_reconnect_retry++;
  				next_reconnect_interval = (UINT64)num_reconnect_retry * AZURE_CONNECT_INITIAL_RETRY_INTERVAL;
  				next_reconnect_interval = MIN(next_reconnect_interval, AZURE_CONNECT_MAX_RETRY_INTERVAL);
  
  				r = (UINT)next_reconnect_interval;
  
  				r = GenRandInterval(r / 2, r);
  
  				next_reconnect_interval = r;
  
  				connect_now = true;
  			}
  
  			if (IsEmptyStr(st.CurrentAzureIp) == false && IsEmptyStr(st.CurrentHostName) == false)
  			{
  				if (connect_now)
  				{
  					SOCK *s;
  					char *host = NULL;
  					UINT port = AZURE_SERVER_PORT;
  
  					Debug("VPN Azure: Connecting to %s...\n", st.CurrentAzureIp);
  
  					if (ParseHostPort(st.CurrentAzureIp, &host, &port, AZURE_SERVER_PORT))
  					{
  						if (st.InternetSetting.ProxyType == PROXY_DIRECT)
  						{
  							s = ConnectEx2(host, port, 0, (bool *)&ac->Halt);
  						}
  						else
  						{
  							s = WpcSockConnect2(host, port, &st.InternetSetting, NULL, AZURE_VIA_PROXY_TIMEOUT);
  						}
  
  						if (s != NULL)
  						{
  							PACK *p;
  							UINT64 established_tick = 0;
  
  							Debug("VPN Azure: Connected.\n");
  
  							SetTimeout(s, AZURE_PROTOCOL_CONTROL_TIMEOUT_DEFAULT);
  
  							Lock(ac->Lock);
  							{
  								ac->CurrentSock = s;
  								ac->IsConnected = true;
  								StrCpy(ac->ConnectingAzureIp, sizeof(ac->ConnectingAzureIp), st.CurrentAzureIp);
  							}
  							Unlock(ac->Lock);
  
  							SendAll(s, AZURE_PROTOCOL_CONTROL_SIGNATURE, StrLen(AZURE_PROTOCOL_CONTROL_SIGNATURE), false);
  
  							// Receive parameter
  							p = RecvPackWithHash(s);
  							if (p != NULL)
  							{
  								UCHAR c;
  								AZURE_PARAM param;
  								bool hostname_changed = false;
  
  								Zero(&param, sizeof(param));
  
  								param.ControlKeepAlive = PackGetInt(p, "ControlKeepAlive");
  								param.ControlTimeout = PackGetInt(p, "ControlTimeout");
  								param.DataTimeout = PackGetInt(p, "DataTimeout");
  								param.SslTimeout = PackGetInt(p, "SslTimeout");
  
  								FreePack(p);
  
  								param.ControlKeepAlive = MAKESURE(param.ControlKeepAlive, 1000, AZURE_SERVER_MAX_KEEPALIVE);
  								param.ControlTimeout = MAKESURE(param.ControlTimeout, 1000, AZURE_SERVER_MAX_TIMEOUT);
  								param.DataTimeout = MAKESURE(param.DataTimeout, 1000, AZURE_SERVER_MAX_TIMEOUT);
  								param.SslTimeout = MAKESURE(param.SslTimeout, 1000, AZURE_SERVER_MAX_TIMEOUT);
  
  								Lock(ac->Lock);
  								{
  									Copy(&ac->AzureParam, &param, sizeof(AZURE_PARAM));
  								}
  								Unlock(ac->Lock);
  
  								SetTimeout(s, param.ControlTimeout);
  
  								// Send parameter
  								p = NewPack();
  								PackAddStr(p, "CurrentHostName", st.CurrentHostName);
  								PackAddStr(p, "CurrentAzureIp", st.CurrentAzureIp);
  								PackAddInt64(p, "CurrentAzureTimestamp", st.CurrentAzureTimestamp);
  								PackAddStr(p, "CurrentAzureSignature", st.CurrentAzureSignature);
  
  								Lock(ac->Lock);
  								{
  									if (StrCmpi(st.CurrentHostName, ac->DDnsStatus.CurrentHostName) != 0)
  									{
  										hostname_changed = true;
  									}
  								}
  								Unlock(ac->Lock);
  
  								if (hostname_changed == false)
  								{
  									if (SendPackWithHash(s, p))
  									{
  										// Receive result
  										if (RecvAll(s, &c, 1, false))
  										{
  											if (c && ac->Halt == false)
  											{
  												connect_was_ok = true;
  
  												established_tick = Tick64();
  
  												AcWaitForRequest(ac, s, &param);
  											}
  										}
  									}
  								}
  
  								FreePack(p);
  							}
  							else
  							{
  								WHERE;
  							}
  
  							Debug("VPN Azure: Disconnected.\n");
  
  							Lock(ac->Lock);
  							{
  								ac->IsConnected = false;
  								ac->CurrentSock = NULL;
  								ClearStr(ac->ConnectingAzureIp, sizeof(ac->ConnectingAzureIp));
  							}
  							Unlock(ac->Lock);
  
  							if (established_tick != 0)
  							{
  								if ((established_tick + (UINT64)AZURE_CONNECT_MAX_RETRY_INTERVAL) <= Tick64())
  								{
  									// If the connected time exceeds the AZURE_CONNECT_MAX_RETRY_INTERVAL, reset the retry counter.
  									last_reconnect_tick = 0;
  									num_reconnect_retry = 0;
  									next_reconnect_interval = AZURE_CONNECT_INITIAL_RETRY_INTERVAL;
  								}
  							}
  
  							Disconnect(s);
  							ReleaseSock(s);
  						}
  						else
  						{
  							Debug("VPN Azure: Error: Connect Failed.\n");
  						}
  
  						Free(host);
  					}
  				}
  			}
  		}
  		else
  		{
  			last_reconnect_tick = 0;
  			num_reconnect_retry = 0;
  			next_reconnect_interval = AZURE_CONNECT_INITIAL_RETRY_INTERVAL;
  		}
  
  		if (ac->Halt)
  		{
  			break;
  		}
  
  		if (connect_was_ok)
  		{
  			// If connection goes out after connected, increment connection success count to urge DDNS client query
  			next_ddns_retry_tick = Tick64() + MIN((UINT64)DDNS_VPN_AZURE_CONNECT_ERROR_DDNS_RETRY_TIME_DIFF * (UINT64)(num_reconnect_retry + 1), (UINT64)DDNS_VPN_AZURE_CONNECT_ERROR_DDNS_RETRY_TIME_DIFF_MAX);
  		}
  
  		if ((next_ddns_retry_tick != 0) && (Tick64() >= next_ddns_retry_tick))
  		{
  			next_ddns_retry_tick = 0;
  
  			ac->DDnsTriggerInt++;
  		}
  
  		Wait(ac->Event, rand() % 1000);
  	}
  }
  
  // Get enabled or disabled VPN Azure client
  bool AcGetEnable(AZURE_CLIENT *ac)
  {
  	// Validate arguments
  	if (ac == NULL)
  	{
  		return false;
  	}
  
  	return ac->IsEnabled;
  }
  
  // Enable or disable VPN Azure client
  void AcSetEnable(AZURE_CLIENT *ac, bool enabled)
  {
  	bool old_status;
  	// Validate arguments
  	if (ac == NULL)
  	{
  		return;
  	}
  
  	old_status = ac->IsEnabled;
  
  	ac->IsEnabled = enabled;
  
  	if (ac->IsEnabled && (ac->IsEnabled != old_status))
  	{
  		ac->DDnsTriggerInt++;
  	}
  
  	AcApplyCurrentConfig(ac, NULL);
  }
  
  // Set current configuration to VPN Azure client
  void AcApplyCurrentConfig(AZURE_CLIENT *ac, DDNS_CLIENT_STATUS *ddns_status)
  {
  	bool disconnect_now = false;
  	SOCK *disconnect_sock = NULL;
  	// Validate arguments
  	if (ac == NULL)
  	{
  		return;
  	}
  
  	// Get current DDNS configuration
  	Lock(ac->Lock);
  	{
  		if (ddns_status != NULL)
  		{
  			if (StrCmpi(ac->DDnsStatus.CurrentHostName, ddns_status->CurrentHostName) != 0)
  			{
  				// If host name is changed, disconnect current data connection
  				disconnect_now = true;
  			}
  
  			if (Cmp(&ac->DDnsStatus.InternetSetting, &ddns_status->InternetSetting, sizeof(INTERNET_SETTING)) != 0)
  			{
  				// If proxy setting is changed, disconnect current data connection
  				disconnect_now = true;
  			}
  
  			Copy(&ac->DDnsStatus, ddns_status, sizeof(DDNS_CLIENT_STATUS));
  		}
  
  		if (ac->IsEnabled == false)
  		{
  			// If VPN Azure client is disabled, disconnect current data connection
  			disconnect_now = true;
  		}
  
  		if (disconnect_now)
  		{
  			if (ac->CurrentSock != NULL)
  			{
  				disconnect_sock = ac->CurrentSock;
  				AddRef(disconnect_sock->ref);
  			}
  		}
  	}
  	Unlock(ac->Lock);
  
  	if (disconnect_sock != NULL)
  	{
  		Disconnect(disconnect_sock);
  		ReleaseSock(disconnect_sock);
  	}
  
  	Set(ac->Event);
  }
  
  // Free VPN Azure client
  void FreeAzureClient(AZURE_CLIENT *ac)
  {
  	SOCK *disconnect_sock = NULL;
  	// Validate arguments
  	if (ac == NULL)
  	{
  		return;
  	}
  
  	ac->Halt = true;
  
  	Lock(ac->Lock);
  	{
  		if (ac->CurrentSock != NULL)
  		{
  			disconnect_sock = ac->CurrentSock;
  
  			AddRef(disconnect_sock->ref);
  		}
  	}
  	Unlock(ac->Lock);
  
  	if (disconnect_sock != NULL)
  	{
  		Disconnect(disconnect_sock);
  		ReleaseSock(disconnect_sock);
  	}
  
  	Set(ac->Event);
  
  	// Stop main thread
  	WaitThread(ac->MainThread, INFINITE);
  	ReleaseThread(ac->MainThread);
  
  	ReleaseEvent(ac->Event);
  
  	DeleteLock(ac->Lock);
  
  	Free(ac);
  }
  
  // Create new VPN Azure client
  AZURE_CLIENT *NewAzureClient(CEDAR *cedar, SERVER *server)
  {
  	AZURE_CLIENT *ac;
  	// Validate arguments
  	if (cedar == NULL || server == NULL)
  	{
  		return NULL;
  	}
  
  	ac = ZeroMalloc(sizeof(AZURE_CLIENT));
  
  	ac->Cedar = cedar;
  
  	ac->Server = server;
  
  	ac->Lock = NewLock();
  
  	ac->IsEnabled = false;
  
  	ac->Event = NewEvent();
  
  	// Start main thread
  	ac->MainThread = NewThread(AcMainThread, ac);
  
  	return ac;
  }
  
  