[CTX] [ALL] multiplexed SOCKS/MASTER/PROXY over SockMux

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SOCKMUX parameter*  ==  SOCKMUX=host:port:option[,option]*
            option  ==  acc | con | ssl
                    --  default: none
                    --  status: tentative

If specified together with SOCKS, PROXY, MASTER (to chain two DeleGate), then the communication between DeleGate is multiplexed on a single persistent connection using SockMux. This is useful to reduce the delay to establish many connections repeatedly between DeleGate which are running distant from each other with long RTT.

host:port specifies the port toward which a SockMux persistent connection is established. The connection is established from the DeleGate with "con" option to the DeleGate with "acc" option.

Options:

acc -- accept a SockMux connection at "host:port".
con -- connect a SockMux connection to "host:port".
ssl -- use SSL instead of the "Credhy" encryption.

Example: SOCKS proxies chained over SockMux

hostA% delegated SOCKMUX=hostA:8000:acc SERVER=socks -P2080
hostB% delegated SOCKMUX=hostA:8000:con SERVER=socks -P1080 SOCKS=hostA:8000


Example: SOCKS proxies chained over SockMux connected from the server side

hostA% delegated SOCKMUX=hostB:8000:con SERVER=socks -P2080
hostB% delegated SOCKMUX=hostB:8000:acc SERVER=socks -P1080 SOCKS=hostA:8000


Example: HTTP proxies chained over SockMux

hostA% delegated SOCKMUX=hostA:8000:acc SERVER=http -P9080
hostB% delegated SOCKMUX=hostA:8000:con SERVER=http -P8080 PROXY=hostA:8000


Example: HTTP via SOCKS proxy chained over SockMux

hostA% delegated SOCKMUX=hostA:8000:acc SERVER=socks -P2080
hostB% delegated SOCKMUX=hostA:8000:con SERVER=http -P8080 SOCKS=hostA:8000

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