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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
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+/**
+ * @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>
+
+/** Service identifier passed to lockdownd_start_service() to start the companion proxy service */
+#define COMPANION_PROXY_SERVICE_NAME "com.apple.companion_proxy"
+
+/** Error Codes */
+typedef enum {
+        COMPANION_PROXY_E_SUCCESS         =  0,
+        COMPANION_PROXY_E_INVALID_ARG     = -1,
+        COMPANION_PROXY_E_PLIST_ERROR     = -2,
+        COMPANION_PROXY_E_MUX_ERROR       = -3,
+        COMPANION_PROXY_E_SSL_ERROR       = -4,
+        COMPANION_PROXY_E_NOT_ENOUGH_DATA = -5,
+        COMPANION_PROXY_E_TIMEOUT         = -6,
+        COMPANION_PROXY_E_OP_IN_PROGRESS  = -7,
+        COMPANION_PROXY_E_NO_DEVICES      = -100,
+        COMPANION_PROXY_E_UNSUPPORTED_KEY = -101,
+        COMPANION_PROXY_E_TIMEOUT_REPLY   = -102,
+        COMPANION_PROXY_E_UNKNOWN_ERROR   = -256
+} companion_proxy_error_t;
+
+typedef struct companion_proxy_client_private companion_proxy_client_private; /**< \private */
+typedef companion_proxy_client_private *companion_proxy_client_t; /**< The client handle. */
+
+/** Callback for companion device events */
+typedef void (*companion_proxy_device_event_cb_t) (plist_t event, void* userdata);
+
+/**
+ * Connects to the companion_proxy 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
+ *     companion_proxy_client_t upon successful return. Must be freed using
+ *     companion_proxy_client_free() after use.
+ *
+ * @return COMPANION_PROXY_E_SUCCESS on success, COMPANION_PROXY_E_INVALID_ARG when
+ *     the arguments are invalid, or an COMPANION_PROXY_E_* error code otherwise.
+ */
+LIBIMOBILEDEVICE_API companion_proxy_error_t companion_proxy_client_new(idevice_t device, lockdownd_service_descriptor_t service, companion_proxy_client_t* client);
+
+/**
+ * Starts a new companion_proxy 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
+ *     companion_proxy_client_t upon successful return. Must be freed using
+ *     companion_proxy_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 COMPANION_PROXY_E_SUCCESS on success, or an COMPANION_PROXY_E_* error
+ *     code otherwise.
+ */
+LIBIMOBILEDEVICE_API companion_proxy_error_t companion_proxy_client_start_service(idevice_t device, companion_proxy_client_t* client, const char* label);
+
+/**
+ * Disconnects a companion_proxy client from the device and frees up the
+ * companion_proxy client data.
+ *
+ * @param client The companion_proxy client to disconnect and free.
+ *
+ * @return COMPANION_PROXY_E_SUCCESS on success, COMPANION_PROXY_E_INVALID_ARG when
+ *     client is NULL, or an COMPANION_PROXY_E_* error code otherwise.
+ */
+LIBIMOBILEDEVICE_API companion_proxy_error_t companion_proxy_client_free(companion_proxy_client_t client);
+
+/**
+ * Sends a plist to the service.
+ *
+ * @param client The companion_proxy client
+ * @param plist The plist to send
+ *
+ * @return COMPANION_PROXY_E_SUCCESS on success,
+ *  COMPANION_PROXY_E_INVALID_ARG when client or plist is NULL
+ */
+LIBIMOBILEDEVICE_API companion_proxy_error_t companion_proxy_send(companion_proxy_client_t client, plist_t plist);
+
+/**
+ * Receives a plist from the service.
+ *
+ * @param client The companion_proxy client
+ * @param plist The plist to store the received data
+ *
+ * @return COMPANION_PROXY_E_SUCCESS on success,
+ *  COMPANION_PROXY_E_INVALID_ARG when client or plist is NULL
+ */
+LIBIMOBILEDEVICE_API companion_proxy_error_t companion_proxy_receive(companion_proxy_client_t client, plist_t * plist);
+
+/**
+ * Retrieves a list of paired devices.
+ *
+ * @param client The companion_proxy client
+ * @param paired_devices Point that will receive a PLIST_ARRAY with paired device UDIDs
+ *
+ * @note The device closes the connection after sending the reply.
+ *
+ * @return COMPANION_PROXY_E_SUCCESS on success,
+ *  COMPANION_PROXY_E_NO_DEVICES if no devices are paired,
+ *  or a COMPANION_PROXY_E_* error code otherwise.
+ */
+LIBIMOBILEDEVICE_API companion_proxy_error_t companion_proxy_get_device_registry(companion_proxy_client_t client, plist_t* paired_devices);
+
+/**
+ * Starts listening for paired devices.
+ *
+ * @param client The companion_proxy 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 COMPANION_PROXY_E_SUCCESS on success,
+ *  or a COMPANION_PROXY_E_* error code otherwise.
+ */
+LIBIMOBILEDEVICE_API companion_proxy_error_t companion_proxy_start_listening_for_devices(companion_proxy_client_t client, companion_proxy_device_event_cb_t callback, void* userdata);
+
+/**
+ * Stops listening for paired devices
+ *
+ * @param client The companion_proxy client
+ *
+ * @return COMPANION_PROXY_E_SUCCESS on success,
+ *  or a COMPANION_PROXY_E_* error code otherwise.
+ */
+LIBIMOBILEDEVICE_API companion_proxy_error_t companion_proxy_stop_listening_for_devices(companion_proxy_client_t client);
+
+/**
+ * Returns a value for the given key.
+ *
+ * @param client The companion_proxy client
+ * @param companion_udid UDID of the (paired) companion device
+ * @param key The key to retrieve the value for
+ * @param value A pointer to a plist_t that will receive the value for the given key.
+ *   The consumer is responsible for freeing the value with plist_free() when no longer needed.
+ *
+ * @note The device closes the connection after sending the reply.
+ *
+ * @return COMPANION_PROXY_E_SUCCESS on success,
+ *  COMPANION_PROXY_E_INVALID_ARG when client or paired_devices is invalid,
+ *  COMPANION_PROXY_E_UNSUPPORTED_KEY if the companion device doesn't support the given key,
+ *  or a COMPANION_PROXY_E_* error code otherwise.
+ */
+LIBIMOBILEDEVICE_API companion_proxy_error_t companion_proxy_get_value_from_registry(companion_proxy_client_t client, const char* companion_udid, const char* key, plist_t* value);
+
+/**
+ * Start forwarding a service port on the companion device to a port on the idevice.
+ *
+ * @see companion_proxy_stop_forwarding_service_port
+ *
+ * @param client The companion_proxy 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 COMPANION_PROXY_E_SUCCESS on success,
+ *  or a COMPANION_PROXY_E_* error code otherwise.
+ */
+LIBIMOBILEDEVICE_API companion_proxy_error_t companion_proxy_start_forwarding_service_port(companion_proxy_client_t client, uint16_t remote_port, const char* service_name, uint16_t* forward_port, plist_t options);
+
+/**
+ * Stop forwarding a service port between companion device and idevice.
+ *
+ * @see companion_proxy_start_forwarding_service_port
+ *
+ * @param client The companion_proxy client
+ * @param remote_port remote port
+ *
+ * @return COMPANION_PROXY_E_SUCCESS on success,
+ *  or a COMPANION_PROXY_E_* error code otherwise.
+ */
+LIBIMOBILEDEVICE_API companion_proxy_error_t companion_proxy_stop_forwarding_service_port(companion_proxy_client_t client, uint16_t remote_port);
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif