Add protocol version 1 (plist based) support using libplist

6 files changed, 402 insertions, 28 deletions

diff --git a/CMakeLists.txt b/CMakeLists.txt
index 5f0a6a8..93fa715 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -25,6 +25,23 @@ if(CMAKE_C_FLAGS STREQUAL "")
   set(CMAKE_C_FLAGS "-O2")
 endif()
 
+option(WANT_PLIST "Build with protocol version 1 support using libplist" ON)
+
+set(OPT_INCLUDES "")
+set(OPT_LIBS "")
+if(WANT_PLIST)
+  find_package(PLIST)
+  if(PLIST_FOUND)
+    set(HAVE_PLIST ON)
+    set(OPT_INCLUDES ${OPT_INCLUDES} ${PLIST_INCLUDE_DIRS})
+    set(OPT_LIBS ${OPT_LIBS} ${PLIST_LIBRARIES})
+  else()
+    message("* NOTE: libplist was not found!")
+    message("* libusbmuxd/usbmuxd will be build WITHOUT support for version 1")
+    message("* of the usbmux protocol (plist based).")
+  endif()
+endif()
+
 option(WITH_USBMUXD "Build usbmux daemon (usbmuxd)" ON)
 if(WIN32 AND WITH_USBMUXD)
   message("** NOTE: usbmuxd cannot be built on WIN32 due to missing libusb-1.0 support!")
diff --git a/daemon/CMakeLists.txt b/daemon/CMakeLists.txt
index 6593deb..48ff0c6 100644
--- a/daemon/CMakeLists.txt
+++ b/daemon/CMakeLists.txt
@@ -1,7 +1,9 @@
 find_package(USB REQUIRED)
 include_directories(${USB_INCLUDE_DIRS})
-set(LIBS ${LIBS} ${USB_LIBRARIES})
-
+set(LIBS ${LIBS} ${USB_LIBRARIES} ${OPT_LIBS})
+if(HAVE_PLIST)
+  message("-- usbmuxd will be built with protocol version 1 support")
+endif()
 include_directories (${CMAKE_SOURCE_DIR}/common)
 include_directories (${CMAKE_SOURCE_DIR}/daemon)
 include_directories (${CMAKE_SOURCE_DIR}/libusbmuxd)
diff --git a/daemon/client.c b/daemon/client.c
index 194632d..80bc0c7 100644
--- a/daemon/client.c
+++ b/daemon/client.c
@@ -32,12 +32,20 @@ Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301  USA
 #include <sys/un.h>
 #include <arpa/inet.h>
 
+#ifdef HAVE_PLIST
+#include <plist/plist.h>
+#endif
+
 #include "log.h"
 #include "usb.h"
 #include "client.h"
 #include "device.h"
 
+#ifdef HAVE_PLIST
+#define CMD_BUF_SIZE	1024
+#else
 #define CMD_BUF_SIZE	256
+#endif
 #define REPLY_BUF_SIZE	1024
 
 enum client_state {
@@ -61,6 +69,7 @@ struct mux_client {
 	uint32_t connect_tag;
 	int connect_device;
 	enum client_state state;
+	uint32_t proto_version;
 };
 
 static struct collection client_list;
@@ -155,7 +164,7 @@ void client_get_fds(struct fdlist *list)
 static int send_pkt(struct mux_client *client, uint32_t tag, enum usbmuxd_msgtype msg, void *payload, int payload_length)
 {
 	struct usbmuxd_header hdr;
-	hdr.version = USBMUXD_PROTOCOL_VERSION;
+	hdr.version = client->proto_version;
 	hdr.length = sizeof(hdr) + payload_length;
 	hdr.message = msg;
 	hdr.tag = tag;
@@ -175,7 +184,30 @@ static int send_pkt(struct mux_client *client, uint32_t tag, enum usbmuxd_msgtyp
 
 static int send_result(struct mux_client *client, uint32_t tag, uint32_t result)
 {
-	return send_pkt(client, tag, MESSAGE_RESULT, &result, sizeof(uint32_t));
+	int res = -1;
+#ifdef HAVE_PLIST
+	if (client->proto_version == 1) {
+		/* XML plist packet */
+		char *xml = NULL;
+		uint32_t xmlsize = 0;
+		plist_t dict = plist_new_dict();
+		plist_dict_insert_item(dict, "MessageType", plist_new_string("Result"));
+		plist_dict_insert_item(dict, "Number", plist_new_uint(result));
+		plist_to_xml(dict, &xml, &xmlsize);
+		plist_free(dict);
+		if (xml) {
+			res = send_pkt(client, tag, MESSAGE_PLIST, xml, xmlsize);
+			free(xml);
+		} else {
+			usbmuxd_log(LL_ERROR, "%s: Could not convert plist to xml", __func__);
+		}
+	} else
+#endif
+	{
+		/* binary packet */
+		res = send_pkt(client, tag, MESSAGE_RESULT, &result, sizeof(uint32_t));
+	}
+	return res;
 }
 
 int client_notify_connect(struct mux_client *client, enum usbmuxd_result result)
@@ -203,19 +235,73 @@ int client_notify_connect(struct mux_client *client, enum usbmuxd_result result)
 
 static int notify_device_add(struct mux_client *client, struct device_info *dev)
 {
-	struct usbmuxd_device_record dmsg;
-	memset(&dmsg, 0, sizeof(dmsg));
-	dmsg.device_id = dev->id;
-	strncpy(dmsg.serial_number, dev->serial, 256);
-	dmsg.serial_number[255] = 0;
-	dmsg.location = dev->location;
-	dmsg.product_id = dev->pid;
-	return send_pkt(client, 0, MESSAGE_DEVICE_ADD, &dmsg, sizeof(dmsg));
+	int res = -1;
+#ifdef HAVE_PLIST
+	if (client->proto_version == 1) {
+		/* XML plist packet */
+		char *xml = NULL;
+		uint32_t xmlsize = 0;
+		plist_t dict = plist_new_dict();
+		plist_dict_insert_item(dict, "MessageType", plist_new_string("Attached"));
+		plist_t props = plist_new_dict();
+		// TODO: get current usb speed
+		plist_dict_insert_item(props, "ConnectionSpeed", plist_new_uint(480000000));
+		plist_dict_insert_item(props, "ConnectionType", plist_new_string("USB"));
+		plist_dict_insert_item(props, "DeviceID", plist_new_uint(dev->id));
+		plist_dict_insert_item(props, "LocationID", plist_new_uint(dev->location));
+		plist_dict_insert_item(props, "ProductID", plist_new_uint(dev->pid));
+		plist_dict_insert_item(props, "SerialNumber", plist_new_string(dev->serial));
+		plist_dict_insert_item(dict, "Properties", props);
+		plist_to_xml(dict, &xml, &xmlsize);
+		plist_free(dict);
+		if (xml) {
+			res = send_pkt(client, 0, MESSAGE_PLIST, xml, xmlsize);
+			free(xml);
+		} else {
+			usbmuxd_log(LL_ERROR, "%s: Could not convert plist to xml", __func__);
+		}
+	} else
+#endif
+	{
+		/* binary packet */
+		struct usbmuxd_device_record dmsg;
+		memset(&dmsg, 0, sizeof(dmsg));
+		dmsg.device_id = dev->id;
+		strncpy(dmsg.serial_number, dev->serial, 256);
+		dmsg.serial_number[255] = 0;
+		dmsg.location = dev->location;
+		dmsg.product_id = dev->pid;
+		res = send_pkt(client, 0, MESSAGE_DEVICE_ADD, &dmsg, sizeof(dmsg));
+	}
+	return res;
 }
 
 static int notify_device_remove(struct mux_client *client, uint32_t device_id)
 {
-	return send_pkt(client, 0, MESSAGE_DEVICE_REMOVE, &device_id, sizeof(uint32_t));
+	int res = -1;
+#ifdef HAVE_PLIST
+	if (client->proto_version == 1) {
+		/* XML plist packet */
+		char *xml = NULL;
+		uint32_t xmlsize = 0;
+		plist_t dict = plist_new_dict();
+		plist_dict_insert_item(dict, "MessageType", plist_new_string("Detached"));
+		plist_dict_insert_item(dict, "DeviceID", plist_new_uint(device_id));
+		plist_to_xml(dict, &xml, &xmlsize);
+		plist_free(dict);
+		if (xml) {
+			res = send_pkt(client, 0, MESSAGE_PLIST, xml, xmlsize);
+			free(xml);
+		} else {
+			usbmuxd_log(LL_ERROR, "%s: Could not convert plist to xml", __func__);
+		}
+	} else
+#endif
+	{
+		/* binary packet */
+		res = send_pkt(client, 0, MESSAGE_DEVICE_REMOVE, &device_id, sizeof(uint32_t));
+	}
+	return res;
 }
 
 static int start_listen(struct mux_client *client)
@@ -263,7 +349,92 @@ static int client_command(struct mux_client *client, struct usbmuxd_header *hdr)
 	}
 
 	struct usbmuxd_connect_request *ch;
+#ifdef HAVE_PLIST
+	char *payload;
+	uint32_t payload_size;
+#endif
+
 	switch(hdr->message) {
+#ifdef HAVE_PLIST
+		case MESSAGE_PLIST:
+			client->proto_version = 1;
+			payload = (char*)(hdr) + sizeof(struct usbmuxd_header);
+			payload_size = hdr->length - sizeof(struct usbmuxd_header);
+			plist_t dict = NULL;
+			plist_from_xml(payload, payload_size, &dict);
+			if (!dict) {
+				usbmuxd_log(LL_ERROR, "Could not parse plist from payload!");
+				return -1;
+			} else {
+				char *message = NULL;
+				plist_t node = plist_dict_get_item(dict, "MessageType");
+				plist_get_string_val(node, &message);
+				if (!message) {
+					usbmuxd_log(LL_ERROR, "Could not extract MessageType from plist!");
+					plist_free(dict);
+					return -1;
+				}
+				if (!strcmp(message, "Listen")) {
+					free(message);
+					plist_free(dict);
+					if (send_result(client, hdr->tag, 0) < 0)
+						return -1;
+					usbmuxd_log(LL_DEBUG, "Client %d now LISTENING", client->fd);
+					return start_listen(client);
+				} else if (!strcmp(message, "Connect")) {
+					uint64_t val;
+					uint16_t portnum = 0;
+					uint32_t device_id = 0;
+					free(message);
+					// get device id
+					node = plist_dict_get_item(dict, "DeviceID");
+					if (!node) {
+						usbmuxd_log(LL_ERROR, "Received connect request without device_id!");
+						plist_free(dict);
+						if (send_result(client, hdr->tag, RESULT_BADDEV) < 0)
+							return -1;
+						return 0;
+					}
+					val = 0;
+					plist_get_uint_val(node, &val);
+					device_id = (uint32_t)val;
+
+					// get port number
+					node = plist_dict_get_item(dict, "PortNumber");
+					if (!node) {
+						usbmuxd_log(LL_ERROR, "Received connect request without port number!");
+						plist_free(dict);
+						if (send_result(client, hdr->tag, RESULT_BADCOMMAND) < 0)
+							return -1;
+						return 0;
+					}
+					val = 0;
+					plist_get_uint_val(node, &val);
+					portnum = (uint16_t)val;
+
+					usbmuxd_log(LL_DEBUG, "Client %d connection request to device %d port %d", client->fd, device_id, ntohs(portnum));
+					res = device_start_connect(device_id, ntohs(portnum), client);
+					if(res < 0) {
+						if (send_result(client, hdr->tag, -res) < 0)
+							return -1;
+					} else {
+						client->connect_tag = hdr->tag;
+						client->connect_device = device_id;
+						client->state = CLIENT_CONNECTING1;
+					}
+					return 0;
+				} else {
+					usbmuxd_log(LL_ERROR, "Unexpected command '%s' received!", message);
+					free(message);
+					plist_free(dict);
+					if (send_result(client, hdr->tag, RESULT_BADCOMMAND) < 0)
+						return -1;
+					return 0;
+				}
+			}
+			// should not be reached?!
+			return -1;
+#endif
 		case MESSAGE_LISTEN:
 			if(send_result(client, hdr->tag, 0) < 0)
 				return -1;
@@ -341,8 +512,13 @@ static void process_recv(struct mux_client *client)
 		did_read = 1;
 	}
 	struct usbmuxd_header *hdr = (void*)client->ib_buf;
+#ifdef HAVE_PLIST
+	if((hdr->version != 0) && (hdr->version != 1)) {
+		usbmuxd_log(LL_INFO, "Client %d version mismatch: expected 0 or 1, got %d", client->fd, hdr->version);
+#else
 	if(hdr->version != USBMUXD_PROTOCOL_VERSION) {
 		usbmuxd_log(LL_INFO, "Client %d version mismatch: expected %d, got %d", client->fd, USBMUXD_PROTOCOL_VERSION, hdr->version);
+#endif
 		client_close(client);
 	}
 	if(hdr->length > client->ib_capacity) {
diff --git a/libusbmuxd/CMakeLists.txt b/libusbmuxd/CMakeLists.txt
index d275169..236cca3 100644
--- a/libusbmuxd/CMakeLists.txt
+++ b/libusbmuxd/CMakeLists.txt
@@ -3,7 +3,11 @@ find_package(Threads)
 
 add_library (libusbmuxd SHARED libusbmuxd.c sock_stuff.c ${CMAKE_SOURCE_DIR}/common/utils.c)
 find_library (PTHREAD pthread)
-target_link_libraries (libusbmuxd ${CMAKE_THREAD_LIBS_INIT})
+
+if (HAVE_PLIST)
+  message("-- libusbmuxd will be built with protocol version 1 support")
+endif()
+target_link_libraries (libusbmuxd ${CMAKE_THREAD_LIBS_INIT} ${OPT_LIBS})
 
 # 'lib' is a UNIXism, the proper CMake target is usbmuxd
 # But we can't use that due to the conflict with the usbmuxd daemon,
diff --git a/libusbmuxd/libusbmuxd.c b/libusbmuxd/libusbmuxd.c
index f5e5d1b..f465deb 100644
--- a/libusbmuxd/libusbmuxd.c
+++ b/libusbmuxd/libusbmuxd.c
@@ -32,6 +32,13 @@ Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301  USA
 #include <signal.h>
 #include <pthread.h>
 
+#ifdef HAVE_PLIST
+#include <plist/plist.h>
+#define PLIST_BUNDLE_ID "com.marcansoft.usbmuxd"
+#define PLIST_CLIENT_VERSION_STRING "usbmuxd built for freedom"
+#define PLIST_PROGNAME "libusbmuxd"
+#endif
+
 // usbmuxd public interface
 #include "usbmuxd.h"
 // usbmuxd protocol 
@@ -47,6 +54,7 @@ pthread_t devmon;
 static int listenfd = -1;
 
 static int use_tag = 0;
+static int proto_version = 0;
 
 /**
  * Finds a device info record by its handle.
@@ -104,7 +112,95 @@ static int receive_packet(int sfd, struct usbmuxd_header *header, void **payload
 		}
 	}
 
-	*payload = payload_loc;
+#ifdef HAVE_PLIST
+	if (hdr.message == MESSAGE_PLIST) {
+		char *message = NULL;
+		plist_t plist = NULL;
+		plist_from_xml(payload_loc, payload_size, &plist);
+		free(payload_loc);
+
+		if (!plist) {
+			fprintf(stderr, "%s: Error getting plist from payload!\n", __func__);
+			return -EBADMSG;
+		}
+
+		plist_t node = plist_dict_get_item(plist, "MessageType");
+		if (plist_get_node_type(node) != PLIST_STRING) {
+			fprintf(stderr, "%s: Error getting message type from plist!\n", __func__);
+			free(plist);
+			return -EBADMSG;
+		}
+		
+		plist_get_string_val(node, &message);
+		if (message) {
+			uint64_t val = 0;
+			if (strcmp(message, "Result") == 0) {
+				/* result message */
+				uint32_t dwval = 0;
+				plist_t n = plist_dict_get_item(plist, "Number");
+				plist_get_uint_val(n, &val);
+				*payload = malloc(sizeof(uint32_t));
+				dwval = val;
+				memcpy(*payload, &dwval, sizeof(dwval));
+				hdr.length = sizeof(hdr) + sizeof(dwval);
+				hdr.message = MESSAGE_RESULT;
+			} else if (strcmp(message, "Attached") == 0) {
+				/* device add message */
+				struct usbmuxd_device_record *dev = NULL;
+				plist_t props = plist_dict_get_item(plist, "Properties");
+				if (!props) {
+					fprintf(stderr, "%s: Could not get properties for message '%s' from plist!\n", __func__, message);
+					plist_free(plist);
+					return -EBADMSG;
+				}
+				dev = (struct usbmuxd_device_record*)malloc(sizeof(struct usbmuxd_device_record));
+				memset(dev, 0, sizeof(struct usbmuxd_device_record));
+
+				plist_t n = plist_dict_get_item(props, "DeviceID");
+				plist_get_uint_val(n, &val);
+				dev->device_id = (uint32_t)val;
+
+				n = plist_dict_get_item(props, "ProductID");
+				plist_get_uint_val(n, &val);
+				dev->product_id = (uint32_t)val;
+
+				n = plist_dict_get_item(props, "SerialNumber");
+				char *strval = NULL;
+				plist_get_string_val(n, &strval);
+				if (strval) {
+					strcpy(dev->serial_number, strval);
+					free(strval);
+				}
+				n = plist_dict_get_item(props, "LocationID");
+				plist_get_uint_val(n, &val);
+				dev->location = (uint32_t)val;
+				*payload = (void*)dev;
+				hdr.length = sizeof(hdr) + sizeof(struct usbmuxd_device_record);
+				hdr.message = MESSAGE_DEVICE_ADD;
+			} else if (strcmp(message, "Detached") == 0) {
+				/* device remove message */
+				uint32_t dwval = 0;
+				plist_t n = plist_dict_get_item(plist, "DeviceID");
+				if (n) {
+					plist_get_uint_val(n, &val);
+					*payload = malloc(sizeof(uint32_t));
+					dwval = val;
+					memcpy(*payload, &dwval, sizeof(dwval));
+					hdr.length = sizeof(hdr) + sizeof(dwval);
+					hdr.message = MESSAGE_DEVICE_REMOVE;
+				}
+			} else {
+				fprintf(stderr, "%s: Unexpected message '%s' in plist!\n", __func__, message);
+				plist_free(plist);
+				return -EBADMSG;
+			}
+		}
+		plist_free(plist);
+	} else
+#endif
+	{
+		*payload = payload_loc;
+	}
 
 	memcpy(header, &hdr, sizeof(hdr));
 
@@ -159,7 +255,7 @@ static int send_packet(int sfd, uint32_t message, uint32_t tag, void *payload, u
 	struct usbmuxd_header header;
 
 	header.length = sizeof(struct usbmuxd_header);
-	header.version = USBMUXD_PROTOCOL_VERSION;
+	header.version = proto_version;
 	header.message = message;
 	header.tag = tag;
 	if (payload && (payload_size > 0)) {
@@ -183,23 +279,74 @@ static int send_packet(int sfd, uint32_t message, uint32_t tag, void *payload, u
 
 static int send_listen_packet(int sfd, uint32_t tag)
 {
-	return send_packet(sfd, MESSAGE_LISTEN, tag, NULL, 0);
+	int res = 0;
+#ifdef HAVE_PLIST
+	if (proto_version == 1) {
+		/* plist packet */
+		char *payload = NULL;
+		uint32_t payload_size = 0;
+		plist_t plist;
+
+		/* construct message plist */
+		plist = plist_new_dict();
+		plist_dict_insert_item(plist, "BundleID", plist_new_string(PLIST_BUNDLE_ID));
+		plist_dict_insert_item(plist, "ClientVersionString", plist_new_string(PLIST_CLIENT_VERSION_STRING));
+		plist_dict_insert_item(plist, "MessageType", plist_new_string("Listen"));
+		plist_dict_insert_item(plist, "ProgName", plist_new_string(PLIST_PROGNAME));
+		plist_to_xml(plist, &payload, &payload_size);
+		plist_free(plist);
+
+		res = send_packet(sfd, MESSAGE_PLIST, tag, payload, payload_size);
+		free(payload);
+	} else
+#endif
+	{
+		/* binary packet */
+		res = send_packet(sfd, MESSAGE_LISTEN, tag, NULL, 0);
+	}
+	return res;
 }
 
 static int send_connect_packet(int sfd, uint32_t tag, uint32_t device_id, uint16_t port)
 {
-	struct {
-		uint32_t device_id;
-		uint16_t port;
-		uint16_t reserved;
-	} conninfo;
-
-	conninfo.device_id = device_id;
-	conninfo.port = htons(port);
-	conninfo.reserved = 0;
+	int res = 0;
+#ifdef HAVE_PLIST
+	if (proto_version == 1) {
+		/* plist packet */
+		char *payload = NULL;
+		uint32_t payload_size = 0;
+		plist_t plist;
+
+		/* construct message plist */
+		plist = plist_new_dict();
+		plist_dict_insert_item(plist, "BundleID", plist_new_string(PLIST_BUNDLE_ID));
+		plist_dict_insert_item(plist, "ClientVersionString", plist_new_string(PLIST_CLIENT_VERSION_STRING));
+		plist_dict_insert_item(plist, "MessageType", plist_new_string("Connect"));
+		plist_dict_insert_item(plist, "DeviceID", plist_new_uint(device_id));
+		plist_dict_insert_item(plist, "PortNumber", plist_new_uint(port));
+		plist_dict_insert_item(plist, "ProgName", plist_new_string(PLIST_PROGNAME));
+		plist_to_xml(plist, &payload, &payload_size);
+		plist_free(plist);
+
+		res = send_packet(sfd, MESSAGE_PLIST, tag, (void*)payload, payload_size);
+		free(payload);
+	} else
+#endif
+	{
+		/* binary packet */
+		struct {
+			uint32_t device_id;
+			uint16_t port;
+			uint16_t reserved;
+		} conninfo;
 
-	return send_packet(sfd, MESSAGE_CONNECT, tag, &conninfo, sizeof(conninfo));
+		conninfo.device_id = device_id;
+		conninfo.port = htons(port);
+		conninfo.reserved = 0;
 
+		res = send_packet(sfd, MESSAGE_CONNECT, tag, &conninfo, sizeof(conninfo));
+	}
+	return res;
 }
 
 /**
@@ -231,6 +378,9 @@ static int usbmuxd_listen()
 	int sfd;
 	uint32_t res = -1;
 
+#ifdef HAVE_PLIST
+retry:
+#endif
 	sfd = connect_usbmuxd_socket();
 	if (sfd < 0) {
 		while (event_cb) {
@@ -254,6 +404,12 @@ static int usbmuxd_listen()
 	}
 	if (usbmuxd_get_result(sfd, use_tag, &res) && (res != 0)) {
 		close(sfd);
+#ifdef HAVE_PLIST
+		if ((res == RESULT_BADVERSION) && (proto_version != 1)) {
+			proto_version = 1;
+			goto retry;
+		}
+#endif
 		fprintf(stderr, "%s: ERROR: did not get OK but %d\n", __func__, res);
 		return -1;
 	}
@@ -396,6 +552,9 @@ int usbmuxd_get_device_list(usbmuxd_device_info_t **device_list)
 	int dev_cnt = 0;
 	void *payload = NULL;
 
+#ifdef HAVE_PLIST
+retry:
+#endif
 	sfd = connect_usbmuxd_socket();
 	if (sfd < 0) {
 		fprintf(stderr, "%s: error opening socket!\n", __func__);
@@ -410,6 +569,12 @@ int usbmuxd_get_device_list(usbmuxd_device_info_t **device_list)
 			listen_success = 1;
 		} else {
 			close(sfd);
+#ifdef HAVE_PLIST
+			if ((res == RESULT_BADVERSION) && (proto_version != 1)) {
+				proto_version = 1;
+				goto retry;
+			}
+#endif
 			fprintf(stderr,
 					"%s: Did not get response to scan request (with result=0)...\n",
 					__func__);
@@ -521,6 +686,9 @@ int usbmuxd_connect(const int handle, const unsigned short port)
 	int connected = 0;
 	uint32_t res = -1;
 
+#ifdef HAVE_PLIST
+retry:
+#endif
 	sfd = connect_usbmuxd_socket();
 	if (sfd < 0) {
 		fprintf(stderr, "%s: Error: Connection to usbmuxd failed: %s\n",
@@ -539,6 +707,13 @@ int usbmuxd_connect(const int handle, const unsigned short port)
 				//fprintf(stderr, "%s: Connect success!\n", __func__);
 				connected = 1;
 			} else {
+#ifdef HAVE_PLIST
+				if ((res == RESULT_BADVERSION) && (proto_version == 0)) {
+					proto_version = 1;
+					close(sfd);
+					goto retry;
+				}
+#endif
 				fprintf(stderr, "%s: Connect failed, Error code=%d\n",
 						__func__, res);
 			}
diff --git a/libusbmuxd/usbmuxd-proto.h b/libusbmuxd/usbmuxd-proto.h
index 0d4596c..11dd3cf 100644
--- a/libusbmuxd/usbmuxd-proto.h
+++ b/libusbmuxd/usbmuxd-proto.h
@@ -52,7 +52,7 @@ enum usbmuxd_msgtype {
 	MESSAGE_DEVICE_REMOVE = 5,
 	//???
 	//???
-	//MESSAGE_PLIST = 8,
+	MESSAGE_PLIST = 8,
 };
 
 struct usbmuxd_header {