Question: proxychains mount- and ping-commands and UDP-Protocols through socks5/http-Proxy

[RichardBeisser]

Hello,

is it possible to use proxychains with mount-command or ping-command?
Can I use proxychains for UDP-Protocolls like ntp for sync time, or RTP for Voip?

If yes, how?

Thanks.

Usecase:
I want to sync date/time on my rPI. I also want to mount some webdav-Drives.
For connecting to internet i am using a android-smartphone an tethering. Because the phone uses a VPN, Tethering-Traffic dont go through VPN (general problem of android).
So i have to use a socksproxy-Server-App to bring the tethering-traffic though the VPN.

[rofl0r]

udp: no
icmp (ping): no
mount webdav? depends on whether it uses TCP behind the scenes, if so it should be possible.

[RichardBeisser]

you said that proxychains do not support udp
but socks5 supports UDP:
https://en.wikipedia.org/wiki/SOCKS#SOCKS5
Could you explain why it do not work?

when I mount a webdav-Drive using mount, tcp will be used. Do you know how I get working it with proxychains?

[rofl0r]

but socks5 supports UDP

theoretically yes, but i've so far not seen any socks5 server software that supports it (and the 2 i authored myself don't either). most people go for the low-hanging fruit

[RichardBeisser]

here is an example of a socks5 server which supports.
https://socks-server-settings.de.aptoide.com/app
Does proxychains support UDP at the moment, or do you have to change something in the software?

[rofl0r]

Does proxychains support UDP at the moment

no

do you have to change something in the software?

yes, we'd need to hook the libc functions that send UDP datagrams, handle the socks5 udp protocol and add special-case code to reject socks4 and http proxies for this scenario.

[RichardBeisser]

yes, we'd need to hook the libc functions that send UDP datagrams, handle the socks5 udp protocol and add special-case code to reject socks4 and http proxies for this scenario.

have you plans to do this?
I am asking because of see usecase above.

[rofl0r]

have you plans to do this?

no, i've never needed this functionality. i may consider to merge it though if someone comes up with a well-written PR.

[NyaMisty]

good test tool: gost

[eladts]

i may consider to merge it though if someone comes up with a well-written PR.

Looks like @hc-syn did just that.

#570

https://www.synacktiv.com/sites/default/files/2025-06/sstic-2025-bbs-proxychains-udp.pdf