.ssh/config から LocalForward と DynamicForward の記述部分を読み取って、autossh でトンネルを掘ってもらうスクリプトです。

autossh_tunneling

#!/bin/bash -e

SSH_CONFIG=~/.ssh/config

# ポートは適当
MONITOR_PORT=58626
_monitor_port_inc() { MONITOR_PORT="$(expr ${MONITOR_PORT} + 1)"; }

_is_local_forward() { [ $(echo "${1}" | egrep "^(\d)+:(\d|\.)+:(\d)+$") ]; }
_is_dynamic_forward() { [ $(echo "${1}" | egrep "^(\d)+$") ]; }

_autossh_local() { _autossh L "${1}" "${2}"; }
_autossh_dynamic() { _autossh D "${1}" "${2}"; }

_autossh() { autossh -M "${MONITOR_PORT}" -f -N -t "-${1}" "${2}" "${3}"; _monitor_port_inc; }

FORWARDING_HOSTS=\
$(awk '
    $1 == "Host" {
        host = $2;
        next;
    }
    $1 == "LocalForward" {
        $1 = "";
        sub( /^[[:space:]]*/, "" );
        target = $1":"$2;
    }
    $1 == "DynamicForward" {
        $1 = "";
        sub( /^[[:space:]]*/, "" );
        target = $1;
    }
    target != "" {
        printf "%s,%s\n", host, target;
        target = "";
    }
' "${SSH_CONFIG}")

# tunneling by autossh
for FOREARDING_HOST in ${FORWARDING_HOSTS}; do
    DST_HOSTNAME="$(echo "${FOREARDING_HOST}" | cut -d "," -f 1)"
    FORWARDING_ARG="$(echo "${FOREARDING_HOST}" | cut -d "," -f 2)"
    if _is_local_forward "${FORWARDING_ARG}"; then
        _autossh_local "${FORWARDING_ARG}" "${DST_HOSTNAME}"
    fi
    if _is_dynamic_forward "${FORWARDING_ARG}"; then
        _autossh_dynamic "${FORWARDING_ARG}" "${DST_HOSTNAME}"
    fi
done