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/*
* idevicescreenshot.c
* Gets a screenshot from a device
*
* Copyright (C) 2010 Nikias Bassen <nikias@gmx.li>
*
* 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
*/
#ifdef HAVE_CONFIG_H
#include <config.h>
#endif
#define TOOL_NAME "idevicescreenshot"
#include <stdio.h>
#include <string.h>
#include <stdlib.h>
#include <errno.h>
#include <time.h>
#include <unistd.h>
#ifndef WIN32
#include <signal.h>
#endif
#include <libimobiledevice/libimobiledevice.h>
#include <libimobiledevice/lockdown.h>
#include <libimobiledevice/screenshotr.h>
void get_image_filename(char *imgdata, char **filename);
void print_usage(int argc, char **argv);
int main(int argc, char **argv)
{
idevice_t device = NULL;
lockdownd_client_t lckd = NULL;
lockdownd_error_t ldret = LOCKDOWN_E_UNKNOWN_ERROR;
screenshotr_client_t shotr = NULL;
lockdownd_service_descriptor_t service = NULL;
int result = -1;
int i;
const char *udid = NULL;
int use_network = 0;
char *filename = NULL;
#ifndef WIN32
signal(SIGPIPE, SIG_IGN);
#endif
/* 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], "--udid")) {
i++;
if (!argv[i] || !*argv[i]) {
print_usage(argc, argv);
return 0;
}
udid = argv[i];
continue;
}
else if (!strcmp(argv[i], "-n") || !strcmp(argv[i], "--network")) {
use_network = 1;
continue;
}
else if (!strcmp(argv[i], "-h") || !strcmp(argv[i], "--help")) {
print_usage(argc, argv);
return 0;
}
else if (!strcmp(argv[i], "-v") || !strcmp(argv[i], "--version")) {
printf("%s %s\n", TOOL_NAME, PACKAGE_VERSION);
return 0;
}
else if (argv[i][0] != '-' && !filename) {
filename = strdup(argv[i]);
continue;
}
else {
print_usage(argc, argv);
return 0;
}
}
if (IDEVICE_E_SUCCESS != idevice_new_with_options(&device, udid, (use_network) ? IDEVICE_LOOKUP_NETWORK : IDEVICE_LOOKUP_USBMUX)) {
if (udid) {
printf("No device found with udid %s.\n", udid);
} else {
printf("No device found.\n");
}
return -1;
}
if (LOCKDOWN_E_SUCCESS != (ldret = lockdownd_client_new_with_handshake(device, &lckd, TOOL_NAME))) {
idevice_free(device);
printf("ERROR: Could not connect to lockdownd, error code %d\n", ldret);
return -1;
}
lockdownd_error_t lerr = lockdownd_start_service(lckd, SCREENSHOTR_SERVICE_NAME, &service);
lockdownd_client_free(lckd);
if (lerr == LOCKDOWN_E_SUCCESS) {
if (screenshotr_client_new(device, service, &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) {
get_image_filename(imgdata, &filename);
if (!filename) {
printf("FATAL: Could not find a unique filename!\n");
} else {
FILE *f = fopen(filename, "wb");
if (f) {
if (fwrite(imgdata, 1, (size_t)imgsize, f) == (size_t)imgsize) {
printf("Screenshot saved to %s\n", filename);
result = 0;
} else {
printf("Could not save screenshot to file %s!\n", filename);
}
fclose(f);
} else {
printf("Could not open %s for writing: %s\n", filename, strerror(errno));
}
}
} else {
printf("Could not get screenshot!\n");
}
screenshotr_client_free(shotr);
}
} else {
printf("Could not start screenshotr service: %s\nRemember that you have to mount the Developer disk image on your device if you want to use the screenshotr service.\n", lockdownd_strerror(lerr));
}
if (service)
lockdownd_service_descriptor_free(service);
idevice_free(device);
free(filename);
return result;
}
void get_image_filename(char *imgdata, char **filename)
{
// If the provided filename already has an extension, use it as is.
if (*filename) {
char *last_dot = strrchr(*filename, '.');
if (last_dot && !strchr(last_dot, '/')) {
return;
}
}
// Find the appropriate file extension for the filename.
const char *fileext = NULL;
if (memcmp(imgdata, "\x89PNG", 4) == 0) {
fileext = ".png";
} else if (memcmp(imgdata, "MM\x00*", 4) == 0) {
fileext = ".tiff";
} else {
printf("WARNING: screenshot data has unexpected image format.\n");
fileext = ".dat";
}
// If a filename without an extension is provided, append the extension.
// Otherwise, generate a filename based on the current time.
char *basename = NULL;
if (*filename) {
basename = (char*)malloc(strlen(*filename) + 1);
strcpy(basename, *filename);
free(*filename);
*filename = NULL;
} else {
time_t now = time(NULL);
basename = (char*)malloc(32);
strftime(basename, 31, "screenshot-%Y-%m-%d-%H-%M-%S", gmtime(&now));
}
// Ensure the filename is unique on disk.
char *unique_filename = (char*)malloc(strlen(basename) + strlen(fileext) + 7);
sprintf(unique_filename, "%s%s", basename, fileext);
int i;
for (i = 2; i < (1 << 16); i++) {
if (access(unique_filename, F_OK) == -1) {
*filename = unique_filename;
break;
}
sprintf(unique_filename, "%s-%d%s", basename, i, fileext);
}
if (!*filename) {
free(unique_filename);
}
free(basename);
}
void print_usage(int argc, char **argv)
{
char *name = NULL;
name = strrchr(argv[0], '/');
printf("Usage: %s [OPTIONS] [FILE]\n", (name ? name + 1: argv[0]));
printf("\n");
printf("Gets a screenshot from a connected device.\n");
printf("\n");
printf("The image is in PNG format for iOS 9+ and otherwise in TIFF format.\n");
printf("The screenshot is saved as an image with the given FILE name.\n");
printf("If FILE has no extension, FILE will be a prefix of the saved filename.\n");
printf("If FILE is not specified, \"screenshot-DATE\", will be used as a prefix\n");
printf("of the filename, e.g.:\n");
printf(" ./screenshot-2013-12-31-23-59-59.tiff\n");
printf("\n");
printf("NOTE: A mounted developer disk image is required on the device, otherwise\n");
printf("the screenshotr service is not available.\n");
printf("\n");
printf(" -u, --udid UDID\ttarget specific device by UDID\n");
printf(" -n, --network\t\tconnect to network device\n");
printf(" -d, --debug\t\tenable communication debugging\n");
printf(" -h, --help\t\tprints usage information\n");
printf(" -v, --version\t\tprints version information\n");
printf("\n");
printf("Homepage: <" PACKAGE_URL ">\n");
printf("Bug Reports: <" PACKAGE_BUGREPORT ">\n");
}
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