Support system proxy

Details

In some countries with network restrictions, it is not possible to send ICMP packets to some machines via ping. But melnode only supports ICMP ping, and normal proxies do not support network layer protocols.

If melnode can support TCPing and inherit the system proxy (or proxy parameters), then it is possible to bypass these network restrictions.

[nullchinchilla]

?? What do you mean by ICMP ping? I don't think melnode uses ICMP ping anywhere.

The melnet2 "ping" is over HTTP.

?? What do you mean by ICMP ping? I don't think melnode uses ICMP ping anywhere.

The melnet2 "ping" is over HTTP.

That's weird. If it's HTTP traffic, then proxychain4 should be able to do the proxy, but I failed when I tried.

The log:

[2023-03-07TXX:XX:XXZ WARN  melnet2::swarm] [melnode] get more routes failed from 224.0.0.1:41814: ping failed
[2023-03-07TXX:XX:XXZ WARN  melblkidx] indexing failed with error during network communication: transport-level error: connection closed before message completed, restarting

The command: proxychains4 -q melnode --index-coins --database /var/local/melnode/

The proxychains4 configuration is correct and works well with other applications. That's why I thought "ping" was using the ICMP protocol.

Well, since "ping" in melnet2 uses http, there may be some compatibility issues between proxychains4 and melnode.

Anyway, I think it's good to have the parameter "whether to use the system proxy". Or specify the proxy directly in the parameter.