found by cppcheck and coverity
[src/Cedar/Command.c:523] -> [src/Cedar/Command.c:532]: (style) Variable 'ok' is reassigned a value before the old one has been used.
[src/Cedar/Command.c:776]: (style) Variable 'tick2' is assigned a value that is never used.
[src/Cedar/Command.c:2244]: (style) Variable 'halt_timeout' is assigned a value that is never used.
[src/Cedar/Command.c:2246]: (style) Variable 'check_clock_seed' is assigned a value that is never used.
[src/Cedar/Command.c:2247]: (style) Variable 'halting' is assigned a value that is never used.
[src/Cedar/Command.c:6904]: (style) Unused variable: tmp
[src/Cedar/Command.c:12217]: (style) Variable 'packet_log' is assigned a value that is never used.
[src/Cedar/Command.c:20825]: (style) Variable 'ret' is assigned a value that is never used.
[src/Cedar/Command.c:20883]: (style) Variable 'ret' is assigned a value that is never used.
[src/Cedar/Command.c:20927]: (style) Variable 'ret' is assigned a value that is never used.
[src/Cedar/Command.c:10022]: (style) The function 'CmdEvalIpAndMask46' is never used.
[src/Cedar/Command.c:10109]: (style) The function 'CmdEvalNetworkAndSubnetMask46' is never used.
[src/Cedar/Command.c:23025]: (style) The function 'CmdPrintRow' is never used.
[src/Cedar/Command.c:167]: (style) The function 'InRpcTtResult' is never used.
[src/Cedar/Command.c:148]: (style) The function 'OutRpcTtResult' is never used.
The workaround was required for the "net30" topology because:
"There is a problem in your selection of --ifconfig endpoints [local=192.168.30.10, remote=192.168.30.1]. The local and remote VPN endpoints must exist within the same 255.255.255.252 subnet. This is a limitation of --dev tun when used with the TAP-WIN32 driver. Try 'openvpn --show-valid-subnets' option for more info."
See https://community.openvpn.net/openvpn/wiki/Topology for detailed info.
also, remove unused functions:
[src/Cedar/EtherLog.c:1377]: (style) The function 'ElFree' is never used.
[src/Cedar/EtherLog.c:1370]: (style) The function 'ElInit' is never used.
[src/Cedar/Logging.c:679]: (style) The function 'HubLog' is never used.
[src/Cedar/Logging.c:888]: (style) The function 'IPCLog' is never used.
[src/Cedar/Logging.c:295]: (style) The function 'PrintEraseFileList' is never used.
[src/Cedar/Logging.c:1025]: (style) The function 'SecLog' is never used.
[src/Cedar/Logging.c:622]: (style) The function 'ServerLog' is never used.
[src/Cedar/Logging.c:2273]: (style) The function 'SetLogDirName' is never used.
[src/Cedar/Logging.c:2293]: (style) The function 'SetLogPrefix' is never used.
[src/Cedar/Logging.c:997]: (style) The function 'WriteMultiLineLog' is never used.
[src/Cedar/Logging.c:918]: (style) The function 'WriteSecurityLog' is never used.
[src/Cedar/Logging.c:1018] -> [src/Cedar/Logging.c:1006]:
(warning) Either the condition 'src_session!=NULL' is redundant or there is possible null
pointer dereference: src_session.
[src/Cedar/Interop_OpenVPN.c:2711]: (style) Variable 'now' is assigned a value that is never used.
[src/Cedar/Interop_OpenVPN.c:1053]: (style) The function 'OvsAddEntry' is never used.
[src/Cedar/Interop_OpenVPN.c:2610]: (style) The function 'OvsGetCompatibleL3IPNext' is never used.
[src/Cedar/Interop_OpenVPN.c:1047]: (style) The function 'OvsNewList' is never used.
[src/Cedar/Interop_OpenVPN.c:128]: (style) The function 'OvsSetNoOpenVpnTcp' is never used.
[src/Cedar/Interop_OpenVPN.c:140]: (style) The function 'OvsSetNoOpenVpnUdp' is never used.
[src/Mayaqua/Str.c:3019]: (style) The function 'CopyFormat' is never used.
[src/Mayaqua/Str.c:280]: (style) The function 'HexToInt64' is never used.
[src/Mayaqua/Str.c:2448]: (style) The function 'InChar' is never used.
[src/Mayaqua/Str.c:745]: (style) The function 'IniHasValue' is never used.
[src/Mayaqua/Str.c:692]: (style) The function 'IniInt64Value' is never used.
[src/Mayaqua/Str.c:726]: (style) The function 'IniUniStrValue' is never used.
[src/Mayaqua/Str.c:2138]: (style) The function 'IsPrintableAsciiStr' is never used.
[src/Mayaqua/Str.c:1045]: (style) The function 'NormalizeCrlf' is never used.
[src/Mayaqua/Str.c:2899]: (style) The function 'ReplaceFormatStringFor64' is never used.
[src/Mayaqua/Str.c:2442]: (style) The function 'SearchStri' is never used.
[src/Mayaqua/Str.c:3345]: (style) The function 'StrCheckSize' is never used.
[src/Mayaqua/Str.c:1386]: (style) The function 'StrListToStr' is never used.
[src/Mayaqua/Str.c:348]: (style) The function 'ToHex64' is never used.
[src/Mayaqua/Str.c:2803]: (style) The function 'ToStri' is never used.
[src/Mayaqua/Str.c:2797]: (style) The function 'ToStrx' is never used.
[src/Mayaqua/Str.c:2791]: (style) The function 'ToStrx8' is never used.
[src/Mayaqua/Str.c:1325]: (style) The function 'TokenListToList' is never used.
OpenVPN sends the cipher name in uppercase, even if it's not standard, thus we have to convert it to lowercase for EVP_get_cipherbyname().
We also have to send the cipher name as it was received from the OpenVPN client, unless it's a different cipher, to prevent a message such as:
"WARNING: 'cipher' is used inconsistently, local='cipher AES-128-GCM', remote='cipher aes-128-gcm'"
It happens because OpenVPN uses "strcmp()" to compare the local and remote parameters: a6fd48ba36/src/openvpn/options.c (L3819-L3831)
See https://github.com/openssl/openssl/issues/6921 for EVP_get_cipherbyname().
