cmd/tailcat: add port:target mappings to serve - #128
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Served ports were always proxied to the same port on localhost. To
reach one service on another host on the server's network, such as an
Android device's adb port on the LAN, the only options were exit-node
mode, which exposes the whole network, or the exec service wrapping
socat.
A serve spec entry may now be "port:target", where the target is a
bare port meaning that port on localhost ("8080:80") or a host:port
elsewhere ("5555:10.2.200.213:5555", IPv6 in brackets). Mappings mix
with plain ports, ranges, and services in the same spec, join the
served-ports packet filter like any other port, and are announced at
startup with one "# Proxying port N to host:port" line each.
Signed-off-by: Brad Fitzpatrick <bradfitz@tailscale.com>
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Served ports were always proxied to the same port on localhost. To
reach one service on another host on the server's network, such as an
Android device's adb port on the LAN, the only options were exit-node
mode, which exposes the whole network, or the exec service wrapping
socat.
A serve spec entry may now be "port:target", where the target is a
bare port meaning that port on localhost ("8080:80") or a host:port
elsewhere ("5555:10.2.200.213:5555", IPv6 in brackets). Mappings mix
with plain ports, ranges, and services in the same spec, join the
served-ports packet filter like any other port, and are announced at
startup with one "# Proxying port N to host:port" line each.