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Merge PR #828: Added the "OpenVPNPushDummyIPv4AddressOnL2Mode" option for the OpenVPN L2 mode.

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Davide Beatrici 2018-12-02 00:35:44 +01:00 committed by GitHub
commit e87a8693bb
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4 changed files with 28 additions and 0 deletions
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2
src/Cedar/Cedar.c
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@ -1554,6 +1554,8 @@ CEDAR *NewCedar(X *server_x, K *server_k)
StrCpy(c->OpenVPNDefaultClientOption, sizeof(c->OpenVPNDefaultClientOption), OVPN_DEF_CLIENT_OPTION_STRING);
c->OpenVPNPushDummyIPv4AddressOnL2Mode = true; // Default true. Override by the config file.
#ifdef BETA_NUMBER
c->Beta = BETA_NUMBER;
#endif // BETA_NUMBER

1
src/Cedar/Cedar.h
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@ -1083,6 +1083,7 @@ typedef struct CEDAR
char OpenVPNDefaultClientOption[MAX_SIZE]; // OpenVPN: Default Client Option String
bool OpenVPNObfuscation; // OpenVPN: Obfuscation mode
char OpenVPNObfuscationMask[MAX_SIZE]; // OpenVPN: String (mask) for XOR obfuscation
bool OpenVPNPushDummyIPv4AddressOnL2Mode; // OpenVPN: Push a dummy IPv4 address on L2 mode
} CEDAR;
// Type of CEDAR

12
src/Cedar/Proto_OpenVPN.c
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@ -2351,6 +2351,18 @@ void OvsRecvPacket(OPENVPN_SERVER *s, LIST *recv_packet_list, UINT protocol)
OvsLog(s, se, c, "LP_SET_IPV4_PARAM",
ip_client, ip_subnet_mask, ip_defgw, ip_dns1, ip_dns2, ip_wins1, ip_wins2);
}
else
{
// OpenVPN L2 mode. To fix the bug of OpenVPN 2.4.6 and particular version of kernel mode TAP driver
// on Linux, the TAP device must be up after the OpenVPN client is connected.
// However there is no direct push instruction to do so to OpenVPN client.
// Therefore we push the dummy IPv4 address (RFC7600) to the OpenVPN client.
if (s->Cedar->OpenVPNPushDummyIPv4AddressOnL2Mode)
{
StrCat(option_str, sizeof(option_str), ",ifconfig 192.0.0.8 255.255.255.240");
}
}
WriteFifo(c->SslPipe->SslInOut->SendFifo, option_str, StrSize(option_str));

13
src/Cedar/Server.c
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@ -5872,6 +5872,17 @@ void SiLoadServerCfg(SERVER *s, FOLDER *f)
}
}
// OpenVPN Push a dummy IPv4 address on L2 mode
if (CfgIsItem(f, "OpenVPNPushDummyIPv4AddressOnL2Mode") == false)
{
// Default enable
c->OpenVPNPushDummyIPv4AddressOnL2Mode = true;
}
else
{
c->OpenVPNPushDummyIPv4AddressOnL2Mode = CfgGetBool(f, "OpenVPNPushDummyIPv4AddressOnL2Mode");
}
// Disable the NAT-traversal feature
s->DisableNatTraversal = CfgGetBool(f, "DisableNatTraversal");
@ -6289,6 +6300,8 @@ void SiWriteServerCfg(FOLDER *f, SERVER *s)
CfgAddStr(f, "OpenVPNDefaultClientOption", c->OpenVPNDefaultClientOption);
CfgAddBool(f, "OpenVPNPushDummyIPv4AddressOnL2Mode", c->OpenVPNPushDummyIPv4AddressOnL2Mode);
if (c->Bridge == false)
{
OPENVPN_SSTP_CONFIG config;