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Cedar/Proto_OpenVPN: Make timeout and ping transmission interval configurable

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Also, the default timeout value is set to 30000 (milliseconds) instead of 10000.

The change is made because it was reported that some routers failed to connect in time.
This commit is contained in:
Davide Beatrici
2021-04-21 08:29:30 +02:00
parent 4b05de1a93
commit 2aaf9012a0
9 changed files with 31 additions and 8 deletions
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21
src/Cedar/Proto_OpenVPN.c
View File

@ -57,8 +57,10 @@ const PROTO_OPTION *OvsOptions()
{
{ .Name = "DefaultClientOption", .Type = PROTO_OPTION_STRING, .String = "dev-type tun,link-mtu 1500,tun-mtu 1500,cipher AES-128-CBC,auth SHA1,keysize 128,key-method 2,tls-client" },
{ .Name = "Obfuscation", .Type = PROTO_OPTION_BOOL, .Bool = false },
{ .Name = "ObfuscationMask", .Type = PROTO_OPTION_STRING, .String = ""},
{ .Name = "ObfuscationMask", .Type = PROTO_OPTION_STRING, .String = "" },
{ .Name = "PingSendInterval", .Type = PROTO_OPTION_UINT32, .UInt32 = 3000 },
{ .Name = "PushDummyIPv4AddressOnL2Mode", .Type = PROTO_OPTION_BOOL, .Bool = true },
{ .Name = "Timeout", .Type = PROTO_OPTION_UINT32, .UInt32 = 30000 },
{ .Name = NULL, .Type = PROTO_OPTION_UNKNOWN }
};
@ -2344,8 +2346,8 @@ void OvsRecvPacket(OPENVPN_SERVER *s, LIST *recv_packet_list, UINT protocol)
// Return the PUSH_REPLY
Format(option_str, sizeof(option_str),
"PUSH_REPLY,ping %u,ping-restart %u",
(OPENVPN_PING_SEND_INTERVAL / 1000),
(OPENVPN_RECV_TIMEOUT / 1000));
s->PingSendInterval / 1000,
s->Timeout / 1000);
if (se->Mode == OPENVPN_MODE_L3)
{
@ -2752,11 +2754,10 @@ void OvsRecvPacket(OPENVPN_SERVER *s, LIST *recv_packet_list, UINT protocol)
{
if ((se->NextPingSendTick == 0) || (se->NextPingSendTick <= s->Now))
{
se->NextPingSendTick = s->Now + (UINT64)(OPENVPN_PING_SEND_INTERVAL);
se->NextPingSendTick = s->Now + s->PingSendInterval;
OvsSendDataPacket(latest_channel, latest_channel->KeyId, ++latest_channel->LastDataPacketId,
ping_signature, sizeof(ping_signature));
//Debug(".");
AddInterrupt(s->Interrupt, se->NextPingSendTick);
}
@ -2767,7 +2768,7 @@ void OvsRecvPacket(OPENVPN_SERVER *s, LIST *recv_packet_list, UINT protocol)
is_disconnected = true;
}
if (se->Established && (s->Now >= (se->LastCommTick + (UINT64)OPENVPN_RECV_TIMEOUT)))
if (se->Established && (s->Now >= (se->LastCommTick + s->Timeout)))
{
is_disconnected = true;
}
@ -2977,10 +2978,18 @@ OPENVPN_SERVER *NewOpenVpnServer(const LIST *options, CEDAR *cedar, INTERRUPT_MA
{
s->ObfuscationMask = CopyStr(option->String);
}
else if (StrCmp(option->Name, "PingSendInterval") == 0)
{
s->PingSendInterval = option->UInt32;
}
else if (StrCmp(option->Name, "PushDummyIPv4AddressOnL2Mode") == 0)
{
s->PushDummyIPv4AddressOnL2Mode = option->Bool;
}
else if (StrCmp(option->Name, "Timeout") == 0)
{
s->Timeout = option->UInt32;
}
}
s->Cedar = cedar;

4
src/Cedar/Proto_OpenVPN.h
View File

@ -26,8 +26,6 @@
#define OPENVPN_TMP_BUFFER_SIZE (65536 + 256) // Temporary buffer size
#define OPENVPN_PING_SEND_INTERVAL 3000 // Transmission interval of Ping
#define OPENVPN_RECV_TIMEOUT 10000 // Communication time-out
#define OPENVPN_NEW_SESSION_DEADLINE_TIMEOUT 30000 // Grace time to complete new VPN session connection since it was created
#define OPENVPN_MAX_PACKET_ID_FOR_TRIGGER_REKEY 0xFF000000 // Packet ID that is a trigger to start the re-key
@ -207,7 +205,9 @@ struct OPENVPN_SERVER
char *DefaultClientOption; // Default option string to push to client
bool Obfuscation; // Obfuscation enabled/disabled
char *ObfuscationMask; // String (mask) for XOR obfuscation
UINT PingSendInterval; // Ping transmission interval
bool PushDummyIPv4AddressOnL2Mode; // Push a dummy IPv4 address in L2 mode
UINT Timeout; // Communication timeout
};
//// Function prototype