OpenVPN 4.0.3 - Error when adding DNS

onixid · 10. Februar 2019

Hi, I just stumbled in the following error while trying to add DNS addresses to my OpenVPN configuration:

Code

Failed to execute command 'export PATH=/bin:/sbin:/usr/bin:/usr/sbin:/usr/local/bin:/usr/local/sbin; export LANG=C.UTF-8; omv-mkconf openvpn setup 2>&1' with exit code '2': /usr/share/openmediavault/mkconf/openvpn: line 46: 5 - ( / 8) : syntax error: operand expected (error token is "/ 8) ") iptables v1.6.0: option "--to" requires an argument Try `iptables -h' or 'iptables --help' for more information.
Error #0:
OMV\ExecException: Failed to execute command 'export PATH=/bin:/sbin:/usr/bin:/usr/sbin:/usr/local/bin:/usr/local/sbin; export LANG=C.UTF-8; omv-mkconf openvpn setup 2>&1' with exit code '2': /usr/share/openmediavault/mkconf/openvpn: line 46: 5 - ( / 8) : syntax error: operand expected (error token is "/ 8) ")
iptables v1.6.0: option "--to" requires an argument
Try `iptables -h' or 'iptables --help' for more information. in /usr/share/php/openmediavault/system/process.inc:182
Stack trace:
#0 /usr/share/openmediavault/engined/module/openvpn.inc(88): OMV\System\Process->execute()
#1 /usr/share/openmediavault/engined/rpc/config.inc(168): OMV\Engined\Module\OpenVpn->applyConfig()
#2 [internal function]: OMVRpcServiceConfig->applyChanges(Array, Array)
#3 /usr/share/php/openmediavault/rpc/serviceabstract.inc(123): call_user_func_array(Array, Array)
#4 /usr/share/php/openmediavault/rpc/serviceabstract.inc(149): OMV\Rpc\ServiceAbstract->callMethod('applyChanges', Array, Array)
#5 /usr/share/php/openmediavault/rpc/serviceabstract.inc(565): OMV\Rpc\ServiceAbstract->OMV\Rpc\{closure}('/tmp/bgstatusDm...', '/tmp/bgoutputtw...')
#6 /usr/share/php/openmediavault/rpc/serviceabstract.inc(159): OMV\Rpc\ServiceAbstract->execBgProc(Object(Closure))
#7 /usr/share/openmediavault/engined/rpc/config.inc(213): OMV\Rpc\ServiceAbstract->callMethodBg('applyChanges', Array, Array)
#8 [internal function]: OMVRpcServiceConfig->applyChangesBg(Array, Array)
#9 /usr/share/php/openmediavault/rpc/serviceabstract.inc(123): call_user_func_array(Array, Array)
#10 /usr/share/php/openmediavault/rpc/rpc.inc(86): OMV\Rpc\ServiceAbstract->callMethod('applyChangesBg', Array, Array)
#11 /usr/sbin/omv-engined(536): OMV\Rpc\Rpc::call('Config', 'applyChangesBg', Array, Array, 1)
#12 {main}

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The only possible action was to revert the changes and leave the DNS field empty.

onixid · 10. Februar 2019

Actually it seems that the problem is much wider than I thought as I noticed that after I got that error OpenVPN doesn't restart anymore.
I see that there's an error thrown by the iptables command, I'm not sure if that's related to some change in the options of the iptables commands, I didn't have time to investigate any further.

onixid · 13. Februar 2019

No one?

onixid · 11. März 2019

Ok I just figured out the issue, so I will post here the solution in case someone falls into the same problem.
This issue happens when OpenVPN is configured on a given interface (mine was set to eno1) and then the gateway interface gets changed, for instance when a bond interface gets configured (in fact that's what I've done). In such cases the OpenVPN plugin doesn't detect the change automatically, so the startup script fails by throwing a BASH error which is not extremely clear.
To solve the problem it's enough to change the gateway interface with the newly created one and run a stop and start of the OpenVPN service.

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