Réécriture en cours de ssh-fwd

bin/ssh-fwd

@@ -1,68 +1,59 @@
 #!/bin/bash
 
-# Alias si le terminal est kitty
-if [ "$TERM" = xterm-kitty ]; then
-    ssh=(kitty +kitten ssh)
-else
-    ssh=(ssh)
-fi
-
-# Variables
-declare -a args
-
-# Foncitons
 error() {
-    >&2 printf '\033[1;31m%s\033[0m \033[1m%s\033[0m\n' ERROR: "$*"
+    >&2 printf '\033[1;31mERROR:\033[0m \033[1m%s\033[0m\n' "$error"
+    return "$1"
 }
 
-help() {
+error_null_arg() {
-    local name
+    local error
-    name="$(basename "$0")"
+    error="Variable \"${1}\" can't be null"
-    cat << EOF
+    error 1
-${name}: utilisation:
-    ${name} SERVEUR PORT_LOCAL PORT_DISTANT [CIBLE] [-- ARGUMENTS_SSH...]
-EOF
 }
 
-error_help() {
+parse_variable() {
-    error "Invalid usage"
+    ! :
-    >&2 help
-    exit 1
 }
 
-requested_port_bridge_pid() {
+# Parser les variables
-    lsof -nP -i TCP -s TCP:LISTEN | awk '($1 == "ssh" && $9 ~ /.*:'"${1}"'/) { print $2 }' | uniq | head -n 1
+trap error_null_arg EXIT
+set -e
+
+ssh_host="$1"
+shift
+
+parse_variable ssh_host "$1" 'SSH host'
+parse_variable local_port 'local port'
+parse_variable distant_port 'distant port'
+
+trap - EXIT
+set +e
+
+# Lancer la redirection SSH
+start_forwarding() {
+    ssh \
+        -f -N \
+        -L "${local_port}:${target}:${distant_port}" \
+        "$@" \
+        "$ssh_host"
 }
 
-# Analyser les arguments
+# Supprimer la redirection SSH
-while [ -n "$1" ]; do
+stop_forwarding() {
-    case "$1" in
+    start_forwarding -O cancel
-        --)
+}
-            shift
-            break
-            ;;
-        *)
-            args+=("$1")
-            shift
-            ;;
-    esac
-done
 
-# Il doit y avoir au moins 3 arguments dans le tableau
+# Retourner 0 si le port de la redirection est déjà utilisé par SSH
-if [ "${#args[@]}" -lt 3 ]; then
+is_forwarding_active() {
-    error_help
+    lsof -i -P -n \
-fi
+        | awk '($1 == "ssh" && $10 == "(LISTEN)") { print $9 }' \
+        | cut -d : -f 2 \
+        | grep -q "$local_port"
+}
 
-pid="$(requested_port_bridge_pid "${args[1]}")"
+# Branchement principal
-if [ -z "$pid" ]; then
+if ! is_forwarding_active; then
-    exec "${ssh[@]}" \
+    start_forwarding
-        -f \
-        -N \
-        -L "${args[1]}:${args[3]:-localhost}:${args[2]}" \
-        "${args[0]}" \
-        "$@"
 else
-    echo "Suppression de la redirection..."
+    stop_forwarding
-    kill "$pid"
 fi
-