This allows an OpenVPN client to bypass a firewall which is aware of the protocol and is able to block it.
The XOR mask set on the server has to be the same on the client, otherwise it will not be able to connect with certain obfuscation modes.
A special OpenVPN client built with the "XOR patch" is required in order to use this function, because it has never been merged in the official OpenVPN repository.
Two parameters are added to the server configuration: "OpenVPNObfuscationMethod" and "OpenVPNObfuscationMask".
Their value can be retrieved with "OpenVpnObfuscationGet" and set with "OpenVpnObfuscationEnable" in the VPN Command Line Management Utility.
found by coverity, cppcheck
[src/Cedar/Server.c:2899]: (style) Variable 'is_vgs_enabled' is assigned a value that is never used.
[src/Cedar/Server.c:3961]: (style) Variable 'id' is assigned a value that is never used.
[src/Cedar/Server.c:5723]: (style) Variable 'c' is assigned a value that is never used.
[src/Cedar/Server.c:5767]: (style) Variable 'num_connections_per_ip' is assigned a value that is never used.
[src/Cedar/Server.c:7327]: (style) Variable 'num' is assigned a value that is never used.
[src/Cedar/Server.c:8444]: (style) The function 'SiCallEnumHubBegin' is never used.
[src/Cedar/Server.c:8454]: (style) The function 'SiCallEnumHubEnd' is never used.
[src/Cedar/Server.c:9923]: (style) The function 'SiCallTaskAsyncBegin' is never used.
[src/Cedar/Server.c:9949]: (style) The function 'SiCallTaskAsyncEnd' is never used.
[src/Cedar/Server.c:10769]: (style) The function 'SiCheckCurrentRegion' is never used.
[src/Cedar/Server.c:2831]: (style) The function 'SiGetAzureEnable' is never used.
[src/Cedar/Server.c:208]: (style) The function 'SiGetServerNumUserObjects' is never used.
[src/Cedar/Server.c:2435]: (style) The function 'SiInitBridge' is never used.
[src/Cedar/Server.c:2540]: (style) The function 'SiTest' is never used.
[src/Cedar/Server.c:6707]: (style) The function 'StGetServer' is never used.
[src/Cedar/Account.c:854]: (style) The function 'AddGroupTraffic' is never used.
[src/Mayaqua/Secure.c:1455]: (style) The function 'AddSecObjToEnumCache' is never used.
[src/Mayaqua/Network.c:18445]: (style) The function 'AddSockList' is never used.
[src/Cedar/Account.c:870]: (style) The function 'AddUserTraffic' is never used.
[src/Cedar/Server.c:1045]: (style) The function 'AdjoinEnumLogFile' is never used.
[src/Cedar/Admin.c:13780]: (style) The function 'AdminConnect' is never used.
[src/Mayaqua/Encrypt.c:855]: (style) The function 'BigNumToStr' is never used.
[src/Mayaqua/Str.c:2113]: (style) The function 'Bit128ToStr' is never used.
[src/Mayaqua/Encrypt.c:898]: (style) The function 'BufToBigNum' is never used.
[src/Mayaqua/Internat.c:1874]: (style) The function 'CalcStrToUtf8' is never used.
[src/Cedar/Hub.c:6689]: (style) The function 'CalcTrafficDiff' is never used.
[src/Mayaqua/Internat.c:1819]: (style) The function 'CalcUtf8ToStr' is never used.
[src/Mayaqua/Network.c:6495]: (style) The function 'CanGetTcpProcessId' is never used.
[src/Cedar/WinUi.c:7226]: (style) The function 'CbInsertStrA' is never used.
[src/Cedar/Client.c:3035]: (style) The function 'CcEnumObjectInSecure' is never used.
[src/Cedar/Client.c:2826]: (style) The function 'CcGetCommonProxySetting' is never used.
[src/Cedar/Client.c:2857]: (style) The function 'CcSetCommonProxySetting' is never used.
[src/Cedar/Cedar.c:575]: (style) The function 'CedarLog' is never used.
[src/Cedar/WinUi.c:9841]: (style) The function 'Center2' is never used.
[src/Mayaqua/Encrypt.c:814]: (style) The function 'CertTest' is never used.
[src/Mayaqua/Encrypt.c:809]: (style) The function 'CertTest2' is never used.
[src/Mayaqua/Encrypt.c:819]: (style) The function 'CertTest_' is never used.
[src/Mayaqua/Cfg.c:1705]: (style) The function 'CfgIsFolder' is never used.
* Allow specifying cipher suites instead of single ciphers.
CipherName now specifies all cipher suites instead of the
preferred cipher. This allows insecure ciphers like RC4 to
be permanently disabled, instead of being the default fallback
when the preferred cipher is unsupported.
CipherName is now left for OpenSSL to verify. Should it be
invalid, a secure default is used. The default CipherName setting
for new servers is one such invalid string: "~DEFAULT~". This
allows for future updates to change the default and the servers
can stay secure.
* Remove unused temporary variable.
