Add OpenVPN clients endpoint

src/main/java/com/litoralregas/openvpn/openvpn/OpenVpnController.java

@@ -0,0 +1,20 @@
+package com.litoralregas.openvpn.openvpn;
+
+import com.litoralregas.openvpn.ssh.SshCommandResult;
+import org.springframework.web.bind.annotation.*;
+
+@RestController
+@RequestMapping("/api/openvpn")
+public class OpenVpnController {
+
+    private final OpenVpnService service;
+
+    public OpenVpnController(OpenVpnService service) {
+        this.service = service;
+    }
+
+    @GetMapping("/clients")
+    public SshCommandResult getClients() {
+        return service.listClients();
+    }
+}

src/main/java/com/litoralregas/openvpn/openvpn/OpenVpnService.java

@@ -0,0 +1,23 @@
+package com.litoralregas.openvpn.openvpn;
+
+import com.litoralregas.openvpn.ssh.SshCommandResult;
+import com.litoralregas.openvpn.ssh.SshService;
+import org.springframework.stereotype.Service;
+
+@Service
+public class OpenVpnService {
+
+    private static final String TOOLS_PATH = "/var/litoral_regas_openvpn/tools";
+
+    private final SshService sshService;
+
+    public OpenVpnService(SshService sshService) {
+        this.sshService = sshService;
+    }
+
+    public SshCommandResult listClients() {
+        return sshService.executeOnConfiguredVps(
+                TOOLS_PATH + "/list-clients.sh"
+        );
+    }
+}