73 lines
1.5 KiB
Bash
Executable file
73 lines
1.5 KiB
Bash
Executable file
#!/bin/bash
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step() {
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printf '\033[1;32m*\033[0m \033[1m%s...\033[0m\n' "$*"
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}
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error() {
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>&2 printf '\033[1;31mERROR:\033[0m \033[1m%s\033[0m\n' "$error"
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return "$1"
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}
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error_null_arg() {
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local error
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error="Argument \"${arg_name}\" can't be null"
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error 1
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}
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# Lancer la redirection SSH
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start_forwarding() {
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ssh \
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-f -N \
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-L "${local_port}:${target}:${distant_port}" \
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"$@" \
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"$ssh_host"
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}
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show_redirection_info() {
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lsof -i -P -n | awk '($1 == "ssh" && $10 == "(LISTEN)" && $9 ~ /.*:'"${local_port}"'/) { print }'
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}
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get_ssh_pid() {
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show_redirection_info | awk '{ print $2 }' | sort | uniq
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}
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# Supprimer la redirection SSH
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stop_forwarding() {
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start_forwarding -O cancel
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if [ "$?" -eq 255 ]; then
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echo "Okay then, brutally killing SSH..."
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kill "$(get_ssh_pid)"
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fi
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}
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# Retourner 0 si le port de la redirection est déjà utilisé par SSH
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is_forwarding_active() {
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[ -n "$(show_redirection_info)" ]
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}
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# Parser les variables
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trap error_null_arg EXIT
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set -e
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arg_name='SSH host' ; ssh_host="$1" ; shift
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arg_name='local port' ; local_port="$1" ; shift
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arg_name='distant port'; distant_port="$1"; shift
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trap - EXIT
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unset arg_name
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if [ -n "$1" ]
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then target="$1"
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else target=localhost
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fi
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set +e
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# Branchement principal
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if ! is_forwarding_active; then
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step "Starting the redirection"
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start_forwarding
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else
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step "Stopping the redirection"
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stop_forwarding
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fi
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