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Merge PR #1092: src/Cedar/Proto_OpenVPN.c: push "block-outside-dns" to clients

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Davide Beatrici 2020-04-20 03:25:43 +02:00 committed by GitHub
commit 9073452b09
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src/Cedar/Proto_OpenVPN.c
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@ -2460,6 +2460,17 @@ void OvsRecvPacket(OPENVPN_SERVER *s, LIST *recv_packet_list)
} }
} }
// From https://community.openvpn.net/openvpn/wiki/Openvpn23ManPage:
//
// --block-outside-dns
// Block DNS servers on other network adapters to prevent DNS leaks.
// This option prevents any application from accessing TCP or UDP port 53 except one inside the tunnel.
// It uses Windows Filtering Platform (WFP) and works on Windows Vista or later.
// This option is considered unknown on non-Windows platforms and unsupported on Windows XP, resulting in fatal error.
// You may want to use --setenv opt or --ignore-unknown-option (not suitable for Windows XP) to ignore said error.
// Note that pushing unknown options from server does not trigger fatal errors.
StrCat(option_str, sizeof(option_str), ",block-outside-dns");
WriteFifo(c->SslPipe->SslInOut->SendFifo, option_str, StrSize(option_str)); WriteFifo(c->SslPipe->SslInOut->SendFifo, option_str, StrSize(option_str));
Debug("Push Str: %s\n", option_str); Debug("Push Str: %s\n", option_str);