TCP and UDP proxy in Go

UDP proxy is unidirectional. Usage:

$ goproxy [flags] [listen-ip]:port [connect-to-ip]:port
Flags:
-debug
        Print debug level info
-dns string
        DNS server address, supply host[:port]; will use system default if not set
-dns-interval duration
        Time interval between DNS queries (default 20s)
-srv
        Query DNS for SRV records, -dns must be specified
-timeout duration
        TCP connect timeout (default 10s)
-udp
        UDP mode
-verbose
        Print noticeable info

Via Docker:

$ docker run --name proxy --restart unless-stopped -d \
    -p 443:443/tcp arkadi/goproxy :443 10.10.20.55:4443

Build Docker image:

$ docker build . -t arkadi/goproxy

Build static 64-bit Linux binary:

$ GOOS=linux GOARCH=amd64 CGO_ENABLED=0 \
    go build -ldflags '-w -extldflags -static'

Note, for a multi-value SRV record the target pool could be unstable as DNS server may only return a subset of the target records (eight records on AWS).

Viva go-nuts!