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#!/bin/bash
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#### Add following lines to your shell rc file (.zshrc .bashrc)
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# ${HOME}/.local/bin/wsl-ssh-agent-relay start
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# export SSH_AUTH_SOCK=${HOME}/.ssh/wsl-ssh-agent.sock
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# If you do not want the ssh agent relay require your ssh agent
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# to be running at the time relay is started add the option -s
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# to wsl-ssh-agent-relay.
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# For debugging startup problems uncomment next line
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# exec 2> >(tee -a -i "$HOME/error.log")
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#### Assuming ~/winhome links to %USERPROFILE on Windows side
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RELAY_BIN="${HOME}/winhome/.wsl/npiperelay.exe"
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PIDFILE="${HOME}/.ssh/wsl-ssh-agent-relay.pid"
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WSL_AGENT_SSH_SOCK="${HOME}/.ssh/wsl-ssh-agent.sock"
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log() {
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echo >&2 "$@"
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}
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is_pid_running() {
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if [[ -z "$1" ]]; then
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return 1
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fi
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ps -p "$1" >/dev/null
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return $?
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}
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_cleanup() {
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log "Cleaning up relay to ${WSL_AGENT_SSH_SOCK}..."
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if is_pid_running "${SOCAT_WSL_AGENT_SSH_PID}"; then
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kill -SIGTERM "${SOCAT_WSL_AGENT_SSH_PID}" || log "Failed."
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fi
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}
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die() {
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if [[ -n "$1" ]]; then
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log "$1"
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fi
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log "Exiting."
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exit 1
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}
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usage() {
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log "Usage: wsl-ssh-agent-relay [OPTIONS] COMMAND"
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log ""
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log " SUMMARY: Relay Windows openssh named pipe to local SSH socket in order to integrate WSL2 and host."
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log " To debug use foreground command"
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log ""
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log " OPTIONS:"
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log " -h|--help this page"
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log ""
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log " -v|--verbose verbose mode"
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log ""
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log " -s|--skip-test skip ssh-agent communication test"
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log ""
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log " COMMAND: start, stop, foreground"
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}
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fg_opts() {
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FG_OPTS=()
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# Generate opts for passing it to foreground version
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if [[ -n "$VERBOSE" ]]; then
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FG_OPTS+=("-v")
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fi
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if [[ -n "$NO_COM_TEST" ]]; then
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FG_OPTS+=("-c")
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fi
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}
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main() {
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POSITIONAL=()
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VERBOSE=""
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SKIP_SSH_TEST=""
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while (($# > 0)); do
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case "$1" in
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-v | --verbose)
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VERBOSE="ENABLED"
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shift # shift once since flags have no values
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;;
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-s | --skip-test)
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SKIP_SSH_TEST="TRUE"
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shift
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;;
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-h | --help)
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usage
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exit 0
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;;
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*) # unknown flag/switch
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POSITIONAL+=("$1")
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shift
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if [[ "${#POSITIONAL[@]}" -gt 1 ]]; then
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usage
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die
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fi
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;;
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esac
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done
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set -- "${POSITIONAL[@]}" # restore positional params
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if [[ -z "$VERBOSE" ]]; then
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QUIET="QUIET"
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fi
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case "${POSITIONAL[0]}" in
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start)
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fg_opts
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start-stop-daemon --start --oknodo --pidfile "${PIDFILE}" --name wsl-ssh-agent-r --make-pidfile --background --startas "$0" ${VERBOSE:+--verbose} ${QUIET:+--quiet} -- foreground "${FG_OPTS[@]}"
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;;
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stop)
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start-stop-daemon --pidfile "${PIDFILE}" --stop --remove-pidfile ${VERBOSE:+--verbose} ${QUIET:+--quiet}
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;;
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status)
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start-stop-daemon --pidfile "${PIDFILE}" --status ${VERBOSE:+--verbose} ${QUIET:+--quiet}
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local result=$?
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case $result in
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0) log "$0 is running" ;;
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1 | 3) log "$0 is not running" ;;
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4) log "$0 unable to determine status" ;;
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esac
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return $result
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;;
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foreground)
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relay
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;;
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*)
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usage
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die
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;;
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esac
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}
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relay() {
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trap _cleanup EXIT
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[[ -f "${RELAY_BIN}" ]] || die "Unable to access ${RELAY_BIN}"
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if pgrep -fx "^ssh-agent\s.+" >/dev/null; then
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log "Killing previously started local ssh-agent..."
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SSH_AGENT_PID="$(pidof ssh-agent)" ssh-agent -k >/dev/null 2>&1
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fi
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if [ -e "${WSL_AGENT_SSH_SOCK}" ]; then
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log "WSL has been shutdown ungracefully, leaving garbage behind"
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rm "${WSL_AGENT_SSH_SOCK}"
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fi
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socat UNIX-LISTEN:"\"${WSL_AGENT_SSH_SOCK}\"",fork EXEC:"\"\'${RELAY_BIN}\' -ei -s \'//./pipe/openssh-ssh-agent\'\"",nofork 1>/dev/null 2>&1 &
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SOCAT_WSL_AGENT_SSH_PID="$!"
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if ! is_pid_running "${SOCAT_WSL_AGENT_SSH_PID}"; then
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log "Relay for ${SOCAT_WSL_AGENT_SSH_PID} failed"
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return 1
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fi
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log "Relay is running with PID: ${SOCAT_WSL_AGENT_SSH_PID}"
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if [[ -z "$SKIP_SSH_TEST" ]]; then
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log -n "Polling remote ssh-agent..."
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SSH_AUTH_SOCK="${WSL_AGENT_SSH_SOCK}" ssh-add -L >/dev/null 2>&1 || die "[$?] Failure communicating with ssh-agent"
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log "OK"
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fi
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# Everything necessary checks, we are ready for actions
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log "Entering wait..."
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wait ${SOCAT_WSL_AGENT_SSH_PID}
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}
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main "$@" |
