New screenshotr service plus idevicescreenshot tool

[#113 state:resolved]

7 files changed, 390 insertions, 1 deletions

diff --git a/include/Makefile.am b/include/Makefile.am
index 0cb3c50..9248e06 100644
--- a/include/Makefile.am
+++ b/include/Makefile.am
@@ -6,5 +6,6 @@ nobase_include_HEADERS = libimobiledevice/libimobiledevice.h \
 			 libimobiledevice/installation_proxy.h \
 			 libimobiledevice/sbservices.h \
 			 libimobiledevice/mobile_image_mounter.h \
+			 libimobiledevice/screenshotr.h \
 			 libimobiledevice/mobilesync.h \
 			 libimobiledevice/mobilebackup.h
diff --git a/include/libimobiledevice/screenshotr.h b/include/libimobiledevice/screenshotr.h
new file mode 100644
index 0000000..077f50c
--- /dev/null
+++ b/include/libimobiledevice/screenshotr.h
@@ -0,0 +1,54 @@
+/**
+ * @file libimobiledevice/screenshotr.h
+ * @brief Screenshot service implementation
+ * \internal
+ *
+ * Copyright (c) 2010 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 ISCREENSHOTR_H
+#define ISCREENSHOTR_H
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+#include <libimobiledevice/libimobiledevice.h>
+
+/* Error Codes */
+#define SCREENSHOTR_E_SUCCESS                0
+#define SCREENSHOTR_E_INVALID_ARG           -1
+#define SCREENSHOTR_E_PLIST_ERROR           -2
+#define SCREENSHOTR_E_MUX_ERROR             -3
+#define SCREENSHOTR_E_BAD_VERSION           -4
+
+#define SCREENSHOTR_E_UNKNOWN_ERROR       -256
+
+typedef int16_t screenshotr_error_t;
+
+struct screenshotr_client_int;
+typedef struct screenshotr_client_int *screenshotr_client_t;
+
+screenshotr_error_t screenshotr_client_new(idevice_t device, uint16_t port, screenshotr_client_t * client);
+screenshotr_error_t screenshotr_client_free(screenshotr_client_t client);
+screenshotr_error_t screenshotr_take_screenshot(screenshotr_client_t client, char **imgdata, uint64_t *imgsize);
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif
diff --git a/src/Makefile.am b/src/Makefile.am
index e847d7c..87fada0 100644
--- a/src/Makefile.am
+++ b/src/Makefile.am
@@ -17,5 +17,6 @@ libimobiledevice_la_SOURCES = idevice.c idevice.h \
 		       installation_proxy.c installation_proxy.h\
 		       sbservices.c sbservices.h\
 		       mobile_image_mounter.c mobile_image_mounter.h\
+		       screenshotr.c screenshotr.h\
 		       mobilesync.c mobilesync.h\
 		       mobilebackup.c mobilebackup.h
diff --git a/src/screenshotr.c b/src/screenshotr.c
new file mode 100644
index 0000000..f8866d0
--- /dev/null
+++ b/src/screenshotr.c
@@ -0,0 +1,186 @@
+/*
+ * screenshotr.c 
+ * com.apple.mobile.screenshotr implementation.
+ * 
+ * Copyright (c) 2010 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 
+ */
+
+#include <plist/plist.h>
+#include <string.h>
+#include <stdlib.h>
+#include <arpa/inet.h>
+
+#include "screenshotr.h"
+#include "device_link_service.h"
+#include "debug.h"
+
+#define SCREENSHOTR_VERSION_INT1 100
+#define SCREENSHOTR_VERSION_INT2 0
+
+/**
+ * Convert a device_link_service_error_t value to a screenshotr_error_t value.
+ * Used internally to get correct error codes.
+ *
+ * @param err An device_link_service_error_t error code
+ *
+ * @return A matching screenshotr_error_t error code,
+ *     SCREENSHOTR_E_UNKNOWN_ERROR otherwise.
+ */
+static screenshotr_error_t screenshotr_error(device_link_service_error_t err)
+{
+	switch (err) {
+		case DEVICE_LINK_SERVICE_E_SUCCESS:
+			return SCREENSHOTR_E_SUCCESS;
+		case DEVICE_LINK_SERVICE_E_INVALID_ARG:
+			return SCREENSHOTR_E_INVALID_ARG;
+		case DEVICE_LINK_SERVICE_E_PLIST_ERROR:
+			return SCREENSHOTR_E_PLIST_ERROR;
+		case DEVICE_LINK_SERVICE_E_MUX_ERROR:
+			return SCREENSHOTR_E_MUX_ERROR;
+		case DEVICE_LINK_SERVICE_E_BAD_VERSION:
+			return SCREENSHOTR_E_BAD_VERSION;
+		default:
+			break;
+	}
+	return SCREENSHOTR_E_UNKNOWN_ERROR;
+}
+
+/**
+ * Makes a connection to the screenshotr service on the device.
+ *
+ * @param device The device to connect to.
+ * @param port Destination port (usually given by lockdownd_start_service).
+ * @param client Pointer that will be set to a newly allocated
+ *     screenshotr_client_t upon successful return.
+ *
+ * @return SCREENSHOTR_E_SUCCESS on success, SCREENSHOTR_E_INVALID ARG if one
+ *     or more parameters are invalid, or SCREENSHOTR_E_CONN_FAILED if the
+ *     connection to the device could not be established.
+ */
+screenshotr_error_t screenshotr_client_new(idevice_t device, uint16_t port,
+					   screenshotr_client_t * client)
+{
+	if (!device || port == 0 || !client || *client)
+		return SCREENSHOTR_E_INVALID_ARG;
+
+	device_link_service_client_t dlclient = NULL;
+	screenshotr_error_t ret = screenshotr_error(device_link_service_client_new(device, port, &dlclient));
+	if (ret != SCREENSHOTR_E_SUCCESS) {
+		return ret;
+	}
+
+	screenshotr_client_t client_loc = (screenshotr_client_t) malloc(sizeof(struct screenshotr_client_int));
+	client_loc->parent = dlclient;
+
+	/* perform handshake */
+	ret = screenshotr_error(device_link_service_version_exchange(dlclient, SCREENSHOTR_VERSION_INT1, SCREENSHOTR_VERSION_INT2));
+	if (ret != SCREENSHOTR_E_SUCCESS) {
+		debug_info("version exchange failed, error %d", ret);
+		screenshotr_client_free(client_loc);
+		return ret;
+	}
+
+	*client = client_loc;
+
+	return ret;
+}
+
+/**
+ * Disconnects a screenshotr client from the device.
+ *
+ * @param client The client to disconnect.
+ *
+ * @return SCREENSHOTR_E_SUCCESS on success, or SCREENSHOTR_E_INVALID_ARG
+ *     if client is NULL.
+ */
+screenshotr_error_t screenshotr_client_free(screenshotr_client_t client)
+{
+	if (!client)
+		return SCREENSHOTR_E_INVALID_ARG;
+	device_link_service_disconnect(client->parent);
+	screenshotr_error_t err = screenshotr_error(device_link_service_client_free(client->parent));
+	free(client);
+	return err;
+}
+
+/**
+ * Get a screen shot from the connected device.
+ *
+ * @param client The connection screenshotr service client.
+ * @param imgdata Pointer that will point to a newly allocated buffer
+ *     containing TIFF image data upon successful return. It is up to the
+ *     caller to free the memory.
+ * @param imgsize Pointer to a uint64_t that will be set to the size of the
+ *     buffer imgdata points to upon successful return.
+ *
+ * @return SCREENSHOTR_E_SUCCESS on success, SCREENSHOTR_E_INVALID_ARG if
+ *     one or more parameters are invalid, or another error code if an
+ *     error occured.
+ */
+screenshotr_error_t screenshotr_take_screenshot(screenshotr_client_t client, char **imgdata, uint64_t *imgsize)
+{
+	if (!client || !client->parent || !imgdata)
+		return SCREENSHOTR_E_INVALID_ARG;
+
+	screenshotr_error_t res = SCREENSHOTR_E_UNKNOWN_ERROR;
+
+	plist_t dict = plist_new_dict();
+	plist_dict_insert_item(dict, "MessageType", plist_new_string("ScreenShotRequest"));
+
+	res = screenshotr_error(device_link_service_process_message(client->parent, dict));
+	plist_free(dict);
+	if (res != SCREENSHOTR_E_SUCCESS) {
+		debug_info("could not send plist, error %d", res);
+		return res;
+	}
+
+	dict = NULL;
+	res = screenshotr_error(device_link_service_get_process_message(client->parent, &dict));
+	if (res != SCREENSHOTR_E_SUCCESS) {
+		debug_info("could not get screenshot data, error %d", res);
+		goto leave;
+	}
+	if (!dict) {
+		debug_info("did not receive screenshot data!");
+		res = SCREENSHOTR_E_PLIST_ERROR;
+		goto leave;
+	}
+
+	plist_t node = plist_dict_get_item(dict, "MessageType");
+	char *strval = NULL;
+	plist_get_string_val(node, &strval);
+	if (!strval || strcmp(strval, "ScreenShotReply")) {
+		debug_info("invalid screenshot data received!");
+		res = SCREENSHOTR_E_PLIST_ERROR;
+		goto leave;
+	}
+	node = plist_dict_get_item(dict, "ScreenShotData");
+	if (!node || plist_get_node_type(node) != PLIST_DATA) {
+		debug_info("no PNG data received!");
+		res = SCREENSHOTR_E_PLIST_ERROR;
+		goto leave;
+	}
+
+	plist_get_data_val(node, imgdata, imgsize);
+	res = SCREENSHOTR_E_SUCCESS;
+
+leave:
+	if (dict)
+		plist_free(dict);
+
+	return res;
+}
diff --git a/src/screenshotr.h b/src/screenshotr.h
new file mode 100644
index 0000000..5f842a7
--- /dev/null
+++ b/src/screenshotr.h
@@ -0,0 +1,31 @@
+/* 
+ * screenshotr.h
+ * com.apple.mobile.screenshotr definitions.
+ * 
+ * Copyright (c) 2010 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 SCREENSHOTR_H
+#define SCREENSHOTR_H
+
+#include "libimobiledevice/screenshotr.h"
+#include "device_link_service.h"
+
+struct screenshotr_client_int {
+	device_link_service_client_t parent;
+};
+
+#endif
diff --git a/tools/Makefile.am b/tools/Makefile.am
index b4fa69e..472ebab 100644
--- a/tools/Makefile.am
+++ b/tools/Makefile.am
@@ -3,7 +3,7 @@ INCLUDES = -I$(top_srcdir)/include
 AM_CFLAGS = $(GLOBAL_CFLAGS) $(libglib2_CFLAGS) $(libgnutls_CFLAGS) $(libtasn1_CFLAGS) $(libgthread2_CFLAGS) $(LFS_CFLAGS)
 AM_LDFLAGS = $(libglib2_LIBS) $(libgnutls_LIBS) $(libtasn1_LIBS) $(libgthread2_LIBS)
 
-bin_PROGRAMS = idevice_id ideviceinfo idevicesyslog idevicebackup ideviceimagemounter
+bin_PROGRAMS = idevice_id ideviceinfo idevicesyslog idevicebackup ideviceimagemounter idevicescreenshot
 
 ideviceinfo_SOURCES = ideviceinfo.c
 ideviceinfo_CFLAGS = $(AM_CFLAGS)
@@ -29,3 +29,8 @@ ideviceimagemounter_SOURCES = ideviceimagemounter.c
 ideviceimagemounter_CFLAGS = $(AM_CFLAGS)
 ideviceimagemounter_LDFLAGS = $(AM_LDFLAGS)
 ideviceimagemounter_LDADD = ../src/libimobiledevice.la
+
+idevicescreenshot_SOURCES = idevicescreenshot.c
+idevicescreenshot_CFLAGS = $(AM_CFLAGS)
+idevicescreenshot_LDFLAGS = $(AM_LDFLAGS)
+idevicescreenshot_LDADD = ../src/libimobiledevice.la
diff --git a/tools/idevicescreenshot.c b/tools/idevicescreenshot.c
new file mode 100644
index 0000000..ca4454c
--- /dev/null
+++ b/tools/idevicescreenshot.c
@@ -0,0 +1,111 @@
+#include <stdio.h>
+#include <string.h>
+#include <stdlib.h>
+#include <errno.h>
+
+#include <libimobiledevice/libimobiledevice.h>
+#include <libimobiledevice/lockdown.h>
+#include <libimobiledevice/screenshotr.h>
+
+void print_usage(int argc, char **argv);
+
+int main(int argc, char **argv)
+{
+	idevice_t device = NULL;
+	lockdownd_client_t lckd = NULL;
+	screenshotr_client_t shotr = NULL;
+	uint16_t port = 0;
+	int result = -1;
+	int i;
+	char *uuid = NULL;
+
+	/* parse cmdline args */
+	for (i = 1; i < argc; i++) {
+		if (!strcmp(argv[i], "-d") || !strcmp(argv[i], "--debug")) {
+			idevice_set_debug_level(1);
+			continue;
+		}
+		else if (!strcmp(argv[i], "-u") || !strcmp(argv[i], "--uuid")) {
+			i++;
+			if (!argv[i] || (strlen(argv[i]) != 40)) {
+				print_usage(argc, argv);
+				return 0;
+			}
+			uuid = strdup(argv[i]);
+			continue;
+		}
+		else if (!strcmp(argv[i], "-h") || !strcmp(argv[i], "--help")) {
+			print_usage(argc, argv);
+			return 0;
+		}
+		else {
+			print_usage(argc, argv);
+			return 0;
+		}
+	}
+
+	if (IDEVICE_E_SUCCESS != idevice_new(&device, uuid)) {
+		printf("No device found, is it plugged in?\n");
+		if (uuid) {
+			free(uuid);
+		}
+		return -1;
+	}
+	if (uuid) {
+		free(uuid);
+	}
+
+	if (LOCKDOWN_E_SUCCESS != lockdownd_client_new_with_handshake(device, &lckd, NULL)) {
+		idevice_free(device);
+		printf("Exiting.\n");
+		return -1;
+	}
+
+	lockdownd_start_service(lckd, "com.apple.mobile.screenshotr", &port);
+	lockdownd_client_free(lckd);
+	if (port > 0) {
+		if (screenshotr_client_new(device, port, &shotr) != SCREENSHOTR_E_SUCCESS) {
+			printf("Could not connect to screenshotr!\n");
+		} else {
+			char *imgdata = NULL;
+			uint64_t imgsize = 0;
+			if (screenshotr_take_screenshot(shotr, &imgdata, &imgsize) == SCREENSHOTR_E_SUCCESS) {
+				FILE *f = fopen("screenshot.tiff", "w");
+				if (f) {
+					if (fwrite(imgdata, 1, (size_t)imgsize, f) == (size_t)imgsize) {
+						printf("Screenshot saved to screenshot.tiff\n");
+						result = 0;
+					} else {
+						printf("Could not save screenshot to file!\n");
+					}
+					fclose(f);
+				} else {
+					printf("Could not open screenshot.tiff for writing: %s\n", strerror(errno));
+				}
+			} else {
+				printf("Could not get screenshot!\n");
+			}
+			screenshotr_client_free(shotr);
+		}
+	} else {
+		printf("Could not start screenshotr service! Remember that you have to mount the Developer disk image on your device if you want to use the screenshotr service.\n");
+	}
+	idevice_free(device);
+	
+	return result;
+}
+
+void print_usage(int argc, char **argv)
+{
+        char *name = NULL;
+
+        name = strrchr(argv[0], '/');
+        printf("Usage: %s [OPTIONS]\n", (name ? name + 1: argv[0]));
+        printf("Gets a screenshot from the connected iPhone/iPod Touch.\n");
+	printf("NOTE: A mounted developer disk image is required on the device, otherwise\n");
+	printf(" the screenshotr service is not available.\n\n");
+        printf("  -d, --debug\t\tenable communication debugging\n");
+        printf("  -u, --uuid UUID\ttarget specific device by its 40-digit device UUID\n");
+        printf("  -h, --help\t\tprints usage information\n");
+        printf("\n");
+}