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diff --git a/include/libimobiledevice/companion_proxy.h b/include/libimobiledevice/companion_proxy.h
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+++ b/include/libimobiledevice/companion_proxy.h
@@ -0,0 +1,208 @@
+/**
+ * @file libimobiledevice/companion_proxy.h
+ * @brief Companion proxy support.
+ * \internal
+ *
+ * Copyright (c) 2019-2020 Nikias Bassen, All Rights Reserved.
+ *
+ * This library is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License as published by the Free Software Foundation; either
+ * version 2.1 of the License, or (at your option) any later version.
+ *
+ * This library is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public
+ * License along with this library; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301  USA
+ */
+
+#ifndef ICOMPANION_PROXY_H
+#define ICOMPANION_PROXY_H
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+#include <libimobiledevice/libimobiledevice.h>
+#include <libimobiledevice/lockdown.h>
+
+#define COMPPROXY_SERVICE_NAME "com.apple.companion_proxy"
+
+/** Error Codes */
+typedef enum {
+        COMPPROXY_E_SUCCESS         =  0,
+        COMPPROXY_E_INVALID_ARG     = -1,
+        COMPPROXY_E_PLIST_ERROR     = -2,
+        COMPPROXY_E_MUX_ERROR       = -3,
+        COMPPROXY_E_SSL_ERROR       = -4,
+        COMPPROXY_E_NOT_ENOUGH_DATA = -5,
+        COMPPROXY_E_TIMEOUT         = -6,
+        COMPPROXY_E_OP_IN_PROGRESS  = -7,
+        COMPPROXY_E_NO_DEVICES      = -100,
+        COMPPROXY_E_UNSUPPORTED_KEY = -101,
+        COMPPROXY_E_TIMEOUT_REPLY   = -102,
+        COMPPROXY_E_UNKNOWN_ERROR   = -256
+} compproxy_error_t;
+
+typedef struct compproxy_client_private compproxy_client_private;
+typedef compproxy_client_private *compproxy_client_t; /**< The client handle. */
+
+typedef void (*compproxy_device_event_cb_t) (plist_t event, void* userdata);
+
+/**
+ * Connects to the compproxy service on the specified device.
+ *
+ * @param device The device to connect to.
+ * @param service The service descriptor returned by lockdownd_start_service.
+ * @param client Pointer that will point to a newly allocated
+ *     compproxy_client_t upon successful return. Must be freed using
+ *     compproxy_client_free() after use.
+ *
+ * @return COMPPROXY_E_SUCCESS on success, COMPPROXY_E_INVALID_ARG when
+ *     the arguments are invalid, or an COMPPROXY_E_* error code otherwise.
+ */
+compproxy_error_t compproxy_client_new(idevice_t device, lockdownd_service_descriptor_t service, compproxy_client_t* client);
+
+/**
+ * Starts a new compproxy service on the specified device and connects to it.
+ *
+ * @param device The device to connect to.
+ * @param client Pointer that will point to a newly allocated
+ *     compproxy_client_t upon successful return. Must be freed using
+ *     compproxy_client_free() after use.
+ * @param label The label to use for communication. Usually the program name.
+ *  Pass NULL to disable sending the label in requests to lockdownd.
+ *
+ * @return COMPPROXY_E_SUCCESS on success, or an COMPPROXY_E_* error
+ *     code otherwise.
+ */
+compproxy_error_t compproxy_client_start_service(idevice_t device, compproxy_client_t* client, const char* label);
+
+/**
+ * Disconnects a compproxy client from the device and frees up the
+ * compproxy client data.
+ *
+ * @param client The compproxy client to disconnect and free.
+ *
+ * @return COMPPROXY_E_SUCCESS on success, COMPPROXY_E_INVALID_ARG when
+ *     client is NULL, or an COMPPROXY_E_* error code otherwise.
+ */
+compproxy_error_t compproxy_client_free(compproxy_client_t client);
+
+/**
+ * Sends a plist to the service.
+ *
+ * @param client The compproxy client
+ * @param plist The plist to send
+ *
+ * @return COMPPROXY_E_SUCCESS on success,
+ *  COMPPROXY_E_INVALID_ARG when client or plist is NULL
+ */
+compproxy_error_t compproxy_send(compproxy_client_t client, plist_t plist);
+
+/**
+ * Receives a plist from the service.
+ *
+ * @param client The compproxy client
+ * @param plist The plist to store the received data
+ *
+ * @return COMPPROXY_E_SUCCESS on success,
+ *  COMPPROXY_E_INVALID_ARG when client or plist is NULL
+ */
+compproxy_error_t compproxy_receive(compproxy_client_t client, plist_t * plist);
+
+/**
+ * Retrieves a list of paired devices.
+ *
+ * @param client The compproxy client
+ * @param devices Point that will receive a PLIST_ARRAY with paired device UDIDs
+ *
+ * @note The device closes the connection after sending the reply.
+ *
+ * @return COMPPROXY_E_SUCCESS on success,
+ *  COMPPROXY_E_NO_DEVICES if no devices are paired,
+ *  or a COMPPROXY_E_* error code otherwise.
+ */
+compproxy_error_t compproxy_get_device_registry(compproxy_client_t client, plist_t* paired_devices);
+
+/**
+ * Starts listening for paired devices.
+ *
+ * @param client The compproxy client
+ * @param callback Callback function that will be called when a new device is detected
+ * @param userdata Pointer that that will be passed to the callback function
+ *
+ * @note The event parameter that gets passed to the callback function is
+ *  freed internally after returning from the callback. The consumer needs
+ *  to make a copy if required.
+ *
+ * @return COMPPROXY_E_SUCCESS on success,
+ *  or a COMPPROXY_E_* error code otherwise.
+ */
+compproxy_error_t compproxy_start_listening_for_devices(compproxy_client_t client, compproxy_device_event_cb_t callback, void* userdata);
+
+/**
+ * Stops listening for paired devices
+ *
+ * @param client The compproxy client
+ *
+ * @return COMPPROXY_E_SUCCESS on success,
+ *  or a COMPPROXY_E_* error code otherwise.
+ */
+compproxy_error_t compproxy_stop_listening_for_devices(compproxy_client_t client);
+
+/**
+ * Returns a value for the given key.
+ *
+ * @param client The compproxy client
+ * @param companion_udid UDID of the (paired) watch
+ * @param key The key to retrieve the value for
+ *
+ * @note The device closes the connection after sending the reply.
+ *
+ * @return COMPPROXY_E_SUCCESS on success,
+ *  COMPPROXY_E_INVALID_ARG when client or paired_devices is invalid,
+ *  COMPPROXY_E_UNSUPPORTED_KEY if the watch doesn't support the given key,
+ *  or a COMPPROXY_E_* error code otherwise.
+ */
+compproxy_error_t compproxy_get_value_from_registry(compproxy_client_t client, const char* companion_udid, const char* key, plist_t* value);
+
+/**
+ * Start forwarding a service port on the watch to a port on the idevice.
+ *
+ * @see compproxy_stop_forwarding_service_port
+ *
+ * @param client The compproxy client
+ * @param remote_port remote port
+ * @param service_name The name of the service that shall be forwarded
+ * @param forward_port Pointer that will receive the newly-assigned port accessible via USB/Network on the idevice
+ * @param options PLIST_DICT with additional options. Currently known are
+ *    IsServiceLowPriority (boolean) and PreferWifi (boolean).
+ *
+ * @return COMPPROXY_E_SUCCESS on success,
+ *  or a COMPPROXY_E_* error code otherwise.
+ */
+compproxy_error_t compproxy_start_forwarding_service_port(compproxy_client_t client, uint16_t remote_port, const char* service_name, uint16_t* forward_port, plist_t options);
+
+/**
+ * Stop forwarding a service port between watch and idevice.
+ *
+ * @see compproxy_start_forwarding_service_port
+ *
+ * @param client The compproxy client
+ * @param remote_port remote port
+ *
+ * @return COMPPROXY_E_SUCCESS on success,
+ *  or a COMPPROXY_E_* error code otherwise.
+ */
+compproxy_error_t compproxy_stop_forwarding_service_port(compproxy_client_t client, uint16_t remote_port);
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif