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#! /usr/bin/env bash
# Login into a machine.
#
# -c|-r|-p <monitor>
# Execute QEMU 'cont', 'system_reset', or 'system_powerdown' command on the
# specified machine monitor UNIX socket prior to logging in.
#
# <host> - build host the machine is running on
# <port> - machine's VNC port on the build host (no login if unspecified)
#
usage="usage: $0 [-c|-r|-p <monitor>] <host> [<port>]"
trap "{ exit 1; }" ERR
set -o errtrace # Trap in functions.
function info () { echo "$*" 1>&2; }
function error () { info "$*"; exit 1; }
mon=
cmd=
while [ "$#" -gt 0 ]; do
case "$1" in
-c|-r|-p)
case "$1" in
-c) cmd=cont ;;
-r) cmd=system_reset ;;
-p) cmd=system_powerdown ;;
esac
shift
mon="$1"
shift
;;
-*)
error "unknown option: $1"
;;
*)
break
;;
esac
done
host="$1"
fport="$2"
if [ -z "$host" ]; then
error "$usage"
fi
if [ -z "$fport" -a -z "$cmd" ]; then
error "$usage"
fi
if [ -n "$cmd" -a -z "$mon" ]; then
error "$usage"
fi
# Find an unused local port. Surprisingly, it's harder than one would expect.
#
function find_used_ports ()
{
# Use netstat(1) to find the list of port in use.
#
# Proto Recv-Q Send-Q Local Address Foreign Address State
# tcp 0 0 0.0.0.0:139 0.0.0.0:* LISTEN
#
local f="([^[:space:]]+)[[:space:]]+"
netstat --listening --all --tcp --numeric | \
sed -n -re "s/^$f$f$f$f.*$/\4/p" | \
sed -n -re "s/^.+:([0-9]+)$/\1/p" | \
sort --unique --numeric-sort
}
function find_unused_port ()
{
local ups
ups=($(find_used_ports))
local lp up u
for ((lp=49152; lp < 65535; lp++)); do
u=
for up in "${ups[@]}"; do
if [ "$lp" -eq "$up" ]; then
u=true
break
fi
done
if [ ! "$u" ]; then
echo "$lp"
return 0
fi
done
echo "all ports are in use" 1>&2
return 1
}
# OpenSSH local port forwarding.
#
# ssh -L <localport>:<fowardhost>:<forwardport> <host>
#
# Forward connections on localhost:<localport> to <fowardhost>:<forwardport>
# via <host>.
#
# We are putting OpenSSH to background (-f -N) and then using the "control
# socket" mechanism (-M -S) to terminate it. This also makes sure we don't
# share any existing control sockets that may be set in .ssh/config (e.g.,
# for connection caching/multiplexing).
#
csock="$(mktemp -u)"
if [ -n "$fport" ]; then
lport=$(find_unused_port)
ssh -f -N -M -S "$csock" -o ExitOnForwardFailure=yes \
-L "$lport:localhost:$fport" "build@$host"
else
ssh -f -N -M -S "$csock" -o ExitOnForwardFailure=yes \
"build@$host"
fi
function exit_trap ()
{
# OpenSSH prints "Exit request sent." regardless of -q.
#
if ! ssh -q -S "$csock" -O exit "build@$host" 2>/dev/null; then
error "unable to terminate background ssh process via $csock"
fi
}
trap exit_trap EXIT
if [ -n "$cmd" ]; then
echo "$cmd" | ssh -S "$csock" "build@$host" socat - "UNIX-CONNECT:$mon"
echo # Add newline after QEMU prompt.
fi
if [ -n "$fport" ]; then
vinagre "localhost:$lport"
fi
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