tools/idevicedebugserverproxy.c - third_party/libimobiledevice - Git at Google

 /*
  * idevicedebugserverproxy.c
  * Proxy a debugserver connection from device for remote debugging
  *
  * Copyright (c) 2012 Martin Szulecki 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
  */

 #ifdef HAVE_CONFIG_H
 #include <config.h>
 #endif

 #define TOOL_NAME "idevicedebugserverproxy"

 #include <stdio.h>
 #include <stdlib.h>
 #include <string.h>
 #include <errno.h>
 #include <signal.h>

 #include <libimobiledevice/libimobiledevice.h>
 #include <libimobiledevice/debugserver.h>

 #include "common/socket.h"
 #include "common/thread.h"

 #define info(...) fprintf(stdout, __VA_ARGS__); fflush(stdout)
 #define debug(...) if(debug_mode) fprintf(stdout, __VA_ARGS__)

 static int debug_mode = 0;
 static int quit_flag = 0;

 typedef struct {
 	int client_fd;
 	idevice_t device;
 	debugserver_client_t debugserver_client;
 	volatile int stop_ctod;
 	volatile int stop_dtoc;
 } socket_info_t;

 struct thread_info {
 	THREAD_T th;
 	struct thread_info *next;
 };

 typedef struct thread_info thread_info_t;


 static void clean_exit(int sig)
 {
 	fprintf(stderr, "Exiting...\n");
 	quit_flag++;
 }

 static void print_usage(int argc, char **argv)
 {
 	char *name = NULL;

 	name = strrchr(argv[0], '/');
 	printf("Usage: %s [OPTIONS] <PORT>\n", (name ? name + 1: argv[0]));
 	printf("\n");
 	printf("Proxy debugserver connection from device to a local socket at PORT.\n");
 	printf("\n");
 	printf("OPTIONS:\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");
 }

 static void *thread_device_to_client(void *data)
 {
 	socket_info_t* socket_info = (socket_info_t*)data;
 	debugserver_error_t res = DEBUGSERVER_E_UNKNOWN_ERROR;

 	int recv_len;
 	int sent;
 	char buffer[131072];

 	debug("%s: started thread...\n", __func__);

 	debug("%s: client_fd = %d\n", __func__, socket_info->client_fd);

 	while (!quit_flag && !socket_info->stop_dtoc && socket_info->client_fd > 0) {
 		debug("%s: receiving data from device...\n", __func__);

 		res = debugserver_client_receive_with_timeout(socket_info->debugserver_client, buffer, sizeof(buffer), (uint32_t*)&recv_len, 5000);

 		if (recv_len <= 0) {
 			if (recv_len == 0 && res == DEBUGSERVER_E_SUCCESS) {
 				// try again
 				continue;
 			} else {
 				fprintf(stderr, "recv failed: %s\n", strerror(errno));
 				break;
 			}
 		} else {
 			/* send to device */
 			debug("%s: sending data to client...\n", __func__);
 			sent = socket_send(socket_info->client_fd, buffer, recv_len);
 			if (sent < recv_len) {
 				if (sent <= 0) {
 					fprintf(stderr, "send failed: %s\n", strerror(errno));
 					break;
 				} else {
 					fprintf(stderr, "only sent %d from %d bytes\n", sent, recv_len);
 				}
 			} else {
 				// sending succeeded, receive from device
 				debug("%s: pushed %d bytes to client\n", __func__, sent);
 			}
 		}
 	}

 	debug("%s: shutting down...\n", __func__);

 	socket_shutdown(socket_info->client_fd, SHUT_RDWR);
 	socket_close(socket_info->client_fd);

 	socket_info->client_fd = -1;
 	socket_info->stop_ctod = 1;

 	return NULL;
 }

 static void *thread_client_to_device(void *data)
 {
 	socket_info_t* socket_info = (socket_info_t*)data;
 	debugserver_error_t res = DEBUGSERVER_E_UNKNOWN_ERROR;

 	int recv_len;
 	int sent;
 	char buffer[131072];
 	THREAD_T dtoc;

 	debug("%s: started thread...\n", __func__);

 	debug("%s: client_fd = %d\n", __func__, socket_info->client_fd);

 	/* spawn server to client thread */
 	socket_info->stop_dtoc = 0;
 	if (thread_new(&dtoc, thread_device_to_client, data) != 0) {
 		fprintf(stderr, "Failed to start device to client thread...\n");
 	}

 	while (!quit_flag && !socket_info->stop_ctod && socket_info->client_fd > 0) {
 		debug("%s: receiving data from client...\n", __func__);

 		/* attempt to read incoming data from client */
 		recv_len = socket_receive_timeout(socket_info->client_fd, buffer, sizeof(buffer), 0, 5000);

 		/* any data received? */
 		if (recv_len <= 0) {
 			if (recv_len == 0) {
 				/* try again */
 				continue;
 			} else {
 				fprintf(stderr, "Receive failed: %s\n", strerror(errno));
 				break;
 			}
 		} else {
 			/* forward data to device */
 			debug("%s: sending data to device...\n", __func__);
 			res = debugserver_client_send(socket_info->debugserver_client, buffer, recv_len, (uint32_t*)&sent);

 			if (sent < recv_len || res != DEBUGSERVER_E_SUCCESS) {
 				if (sent <= 0) {
 					fprintf(stderr, "send failed: %s\n", strerror(errno));
 					break;
 				} else {
 					fprintf(stderr, "only sent %d from %d bytes\n", sent, recv_len);
 				}
 			} else {
 				// sending succeeded, receive from device
 				debug("%s: sent %d bytes to device\n", __func__, sent);
 			}
 		}
 	}

 	debug("%s: shutting down...\n", __func__);

 	socket_shutdown(socket_info->client_fd, SHUT_RDWR);
 	socket_close(socket_info->client_fd);

 	socket_info->client_fd = -1;
 	socket_info->stop_dtoc = 1;

 	/* join other thread to allow it to stop */
 	thread_join(dtoc);
 	thread_free(dtoc);

 	return NULL;
 }

 static void* connection_handler(void* data)
 {
 	debugserver_error_t derr = DEBUGSERVER_E_SUCCESS;
 	socket_info_t* socket_info = (socket_info_t*)data;
 	THREAD_T ctod;

 	debug("%s: client_fd = %d\n", __func__, socket_info->client_fd);

 	derr = debugserver_client_start_service(socket_info->device, &socket_info->debugserver_client, TOOL_NAME);
 	if (derr != DEBUGSERVER_E_SUCCESS) {
 		fprintf(stderr, "Could not start debugserver on device!\nPlease make sure to mount a developer disk image first.\n");
 		return NULL;
 	}

 	/* spawn client to device thread */
 	socket_info->stop_ctod = 0;
 	if (thread_new(&ctod, thread_client_to_device, data) != 0) {
 		fprintf(stderr, "Failed to start client to device thread...\n");
 	}

 	/* join the fun */
 	thread_join(ctod);
 	thread_free(ctod);

 	debug("%s: shutting down...\n", __func__);

 	debugserver_client_free(socket_info->debugserver_client);
 	socket_info->debugserver_client = NULL;

 	/* shutdown client socket */
 	socket_shutdown(socket_info->client_fd, SHUT_RDWR);
 	socket_close(socket_info->client_fd);

 	return NULL;
 }

 int main(int argc, char *argv[])
 {
 	idevice_error_t ret = IDEVICE_E_UNKNOWN_ERROR;
 	idevice_t device = NULL;
 	thread_info_t *thread_list = NULL;
 	const char* udid = NULL;
 	int use_network = 0;
 	uint16_t local_port = 0;
 	int server_fd;
 	int result = EXIT_SUCCESS;
 	int i;

 #ifndef WIN32
 	struct sigaction sa;
 	struct sigaction si;
 	memset(&sa, '\0', sizeof(struct sigaction));
 	memset(&si, '\0', sizeof(struct sigaction));

 	sa.sa_handler = clean_exit;
 	sigemptyset(&sa.sa_mask);

 	si.sa_handler = SIG_IGN;
 	sigemptyset(&si.sa_mask);

 	sigaction(SIGINT, &sa, NULL);
 	sigaction(SIGTERM, &sa, NULL);
 	sigaction(SIGQUIT, &sa, NULL);
 	sigaction(SIGPIPE, &si, NULL);
 #else
 	/* bind signals */
 	signal(SIGINT, clean_exit);
 	signal(SIGTERM, clean_exit);
 #endif

 	/* parse cmdline arguments */
 	for (i = 1; i < argc; i++) {
 		if (!strcmp(argv[i], "-d") || !strcmp(argv[i], "--debug")) {
 			debug_mode = 1;
 			idevice_set_debug_level(1);
 			socket_set_verbose(3);
 			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 EXIT_SUCCESS;
 		}
 		else if (!strcmp(argv[i], "-v") || !strcmp(argv[i], "--version")) {
 			printf("%s %s\n", TOOL_NAME, PACKAGE_VERSION);
 			return EXIT_SUCCESS;
 		}
 		else if (atoi(argv[i]) > 0) {
 			local_port = atoi(argv[i]);
 			continue;
 		}
 		else {
 			print_usage(argc, argv);
 			return EXIT_SUCCESS;
 		}
 	}

 	/* a PORT is mandatory */
 	if (!local_port) {
 		fprintf(stderr, "Please specify a PORT.\n");
 		print_usage(argc, argv);
 		goto leave_cleanup;
 	}

 	/* start services and connect to device */
 	ret = idevice_new_with_options(&device, udid, (use_network) ? IDEVICE_LOOKUP_NETWORK : IDEVICE_LOOKUP_USBMUX);
 	if (ret != IDEVICE_E_SUCCESS) {
 		if (udid) {
 			fprintf(stderr, "No device found with udid %s.\n", udid);
 		} else {
 			fprintf(stderr, "No device found.\n");
 		}
 		result = EXIT_FAILURE;
 		goto leave_cleanup;
 	}

 	/* create local socket */
 	server_fd = socket_create(local_port);
 	if (server_fd < 0) {
 		fprintf(stderr, "Could not create socket\n");
 		result = EXIT_FAILURE;
 		goto leave_cleanup;
 	}

 	while (!quit_flag) {
 		debug("%s: Waiting for connection on local port %d\n", __func__, local_port);

 		/* wait for client */
 		int client_fd = socket_accept(server_fd, local_port);
 		if (client_fd < 0) {
 			continue;
 		}

 		debug("%s: Handling new client connection...\n", __func__);

 		thread_info_t *el = (thread_info_t*)malloc(sizeof(thread_info_t));
 		if (!el) {
 			fprintf(stderr, "Out of memory\n");
 			exit(EXIT_FAILURE);
 		}
 		el->next = NULL;

 		if (thread_list) {
 			thread_list->next = el;
 		} else {
 			thread_list = el;
 		}

 		socket_info_t *sinfo = (socket_info_t*)malloc(sizeof(socket_info_t));
 		if (!sinfo) {
 			fprintf(stderr, "Out of memory\n");
 			exit(EXIT_FAILURE);
 		}
 		sinfo->client_fd = client_fd;
 		sinfo->device = device;

 		if (thread_new(&(el->th), connection_handler, (void*)sinfo) != 0) {
 			fprintf(stderr, "Could not start connection handler.\n");
 			socket_shutdown(server_fd, SHUT_RDWR);
 			socket_close(server_fd);
 			break;
 		}
 	}

 	debug("%s: Shutting down debugserver proxy...\n", __func__);

 	/* join and clean up threads */
 	while (thread_list) {
 		thread_info_t *el = thread_list;
 		thread_join(el->th);
 		thread_free(el->th);
 		thread_list = el->next;
 		free(el);
 	}

 leave_cleanup:
 	if (device) {
 		idevice_free(device);
 	}

 	return result;
 }
	/*
	* idevicedebugserverproxy.c
	* Proxy a debugserver connection from device for remote debugging
	*
	* Copyright (c) 2012 Martin Szulecki 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
	*/

	#ifdef HAVE_CONFIG_H
	#include <config.h>
	#endif

	#define TOOL_NAME "idevicedebugserverproxy"

	#include <stdio.h>
	#include <stdlib.h>
	#include <string.h>
	#include <errno.h>
	#include <signal.h>

	#include <libimobiledevice/libimobiledevice.h>
	#include <libimobiledevice/debugserver.h>

	#include "common/socket.h"
	#include "common/thread.h"

	#define info(...) fprintf(stdout, __VA_ARGS__); fflush(stdout)
	#define debug(...) if(debug_mode) fprintf(stdout, __VA_ARGS__)

	static int debug_mode = 0;
	static int quit_flag = 0;

	typedef struct {
	int client_fd;
	idevice_t device;
	debugserver_client_t debugserver_client;
	volatile int stop_ctod;
	volatile int stop_dtoc;
	} socket_info_t;

	struct thread_info {
	THREAD_T th;
	struct thread_info *next;
	};

	typedef struct thread_info thread_info_t;


	static void clean_exit(int sig)
	{
	fprintf(stderr, "Exiting...\n");
	quit_flag++;
	}

	static void print_usage(int argc, char **argv)
	{
	char *name = NULL;

	name = strrchr(argv[0], '/');
	printf("Usage: %s [OPTIONS] <PORT>\n", (name ? name + 1: argv[0]));
	printf("\n");
	printf("Proxy debugserver connection from device to a local socket at PORT.\n");
	printf("\n");
	printf("OPTIONS:\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");
	}

	static void thread_device_to_client(void data)
	{
	socket_info_t* socket_info = (socket_info_t*)data;
	debugserver_error_t res = DEBUGSERVER_E_UNKNOWN_ERROR;

	int recv_len;
	int sent;
	char buffer[131072];

	debug("%s: started thread...\n", __func__);

	debug("%s: client_fd = %d\n", __func__, socket_info->client_fd);

	while (!quit_flag && !socket_info->stop_dtoc && socket_info->client_fd > 0) {
	debug("%s: receiving data from device...\n", __func__);

	res = debugserver_client_receive_with_timeout(socket_info->debugserver_client, buffer, sizeof(buffer), (uint32_t*)&recv_len, 5000);

	if (recv_len <= 0) {
	if (recv_len == 0 && res == DEBUGSERVER_E_SUCCESS) {
	// try again
	continue;
	} else {
	fprintf(stderr, "recv failed: %s\n", strerror(errno));
	break;
	}
	} else {
	/* send to device */
	debug("%s: sending data to client...\n", __func__);
	sent = socket_send(socket_info->client_fd, buffer, recv_len);
	if (sent < recv_len) {
	if (sent <= 0) {
	fprintf(stderr, "send failed: %s\n", strerror(errno));
	break;
	} else {
	fprintf(stderr, "only sent %d from %d bytes\n", sent, recv_len);
	}
	} else {
	// sending succeeded, receive from device
	debug("%s: pushed %d bytes to client\n", __func__, sent);
	}
	}
	}

	debug("%s: shutting down...\n", __func__);

	socket_shutdown(socket_info->client_fd, SHUT_RDWR);
	socket_close(socket_info->client_fd);

	socket_info->client_fd = -1;
	socket_info->stop_ctod = 1;

	return NULL;
	}

	static void thread_client_to_device(void data)
	{
	socket_info_t* socket_info = (socket_info_t*)data;
	debugserver_error_t res = DEBUGSERVER_E_UNKNOWN_ERROR;

	int recv_len;
	int sent;
	char buffer[131072];
	THREAD_T dtoc;

	debug("%s: started thread...\n", __func__);

	debug("%s: client_fd = %d\n", __func__, socket_info->client_fd);

	/* spawn server to client thread */
	socket_info->stop_dtoc = 0;
	if (thread_new(&dtoc, thread_device_to_client, data) != 0) {
	fprintf(stderr, "Failed to start device to client thread...\n");
	}

	while (!quit_flag && !socket_info->stop_ctod && socket_info->client_fd > 0) {
	debug("%s: receiving data from client...\n", __func__);

	/* attempt to read incoming data from client */
	recv_len = socket_receive_timeout(socket_info->client_fd, buffer, sizeof(buffer), 0, 5000);

	/* any data received? */
	if (recv_len <= 0) {
	if (recv_len == 0) {
	/* try again */
	continue;
	} else {
	fprintf(stderr, "Receive failed: %s\n", strerror(errno));
	break;
	}
	} else {
	/* forward data to device */
	debug("%s: sending data to device...\n", __func__);
	res = debugserver_client_send(socket_info->debugserver_client, buffer, recv_len, (uint32_t*)&sent);

	if (sent < recv_len \|\| res != DEBUGSERVER_E_SUCCESS) {
	if (sent <= 0) {
	fprintf(stderr, "send failed: %s\n", strerror(errno));
	break;
	} else {
	fprintf(stderr, "only sent %d from %d bytes\n", sent, recv_len);
	}
	} else {
	// sending succeeded, receive from device
	debug("%s: sent %d bytes to device\n", __func__, sent);
	}
	}
	}

	debug("%s: shutting down...\n", __func__);

	socket_shutdown(socket_info->client_fd, SHUT_RDWR);
	socket_close(socket_info->client_fd);

	socket_info->client_fd = -1;
	socket_info->stop_dtoc = 1;

	/* join other thread to allow it to stop */
	thread_join(dtoc);
	thread_free(dtoc);

	return NULL;
	}

	static void* connection_handler(void* data)
	{
	debugserver_error_t derr = DEBUGSERVER_E_SUCCESS;
	socket_info_t* socket_info = (socket_info_t*)data;
	THREAD_T ctod;

	debug("%s: client_fd = %d\n", __func__, socket_info->client_fd);

	derr = debugserver_client_start_service(socket_info->device, &socket_info->debugserver_client, TOOL_NAME);
	if (derr != DEBUGSERVER_E_SUCCESS) {
	fprintf(stderr, "Could not start debugserver on device!\nPlease make sure to mount a developer disk image first.\n");
	return NULL;
	}

	/* spawn client to device thread */
	socket_info->stop_ctod = 0;
	if (thread_new(&ctod, thread_client_to_device, data) != 0) {
	fprintf(stderr, "Failed to start client to device thread...\n");
	}

	/* join the fun */
	thread_join(ctod);
	thread_free(ctod);

	debug("%s: shutting down...\n", __func__);

	debugserver_client_free(socket_info->debugserver_client);
	socket_info->debugserver_client = NULL;

	/* shutdown client socket */
	socket_shutdown(socket_info->client_fd, SHUT_RDWR);
	socket_close(socket_info->client_fd);

	return NULL;
	}

	int main(int argc, char *argv[])
	{
	idevice_error_t ret = IDEVICE_E_UNKNOWN_ERROR;
	idevice_t device = NULL;
	thread_info_t *thread_list = NULL;
	const char* udid = NULL;
	int use_network = 0;
	uint16_t local_port = 0;
	int server_fd;
	int result = EXIT_SUCCESS;
	int i;

	#ifndef WIN32
	struct sigaction sa;
	struct sigaction si;
	memset(&sa, '\0', sizeof(struct sigaction));
	memset(&si, '\0', sizeof(struct sigaction));

	sa.sa_handler = clean_exit;
	sigemptyset(&sa.sa_mask);

	si.sa_handler = SIG_IGN;
	sigemptyset(&si.sa_mask);

	sigaction(SIGINT, &sa, NULL);
	sigaction(SIGTERM, &sa, NULL);
	sigaction(SIGQUIT, &sa, NULL);
	sigaction(SIGPIPE, &si, NULL);
	#else
	/* bind signals */
	signal(SIGINT, clean_exit);
	signal(SIGTERM, clean_exit);
	#endif

	/* parse cmdline arguments */
	for (i = 1; i < argc; i++) {
	if (!strcmp(argv[i], "-d") \|\| !strcmp(argv[i], "--debug")) {
	debug_mode = 1;
	idevice_set_debug_level(1);
	socket_set_verbose(3);
	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 EXIT_SUCCESS;
	}
	else if (!strcmp(argv[i], "-v") \|\| !strcmp(argv[i], "--version")) {
	printf("%s %s\n", TOOL_NAME, PACKAGE_VERSION);
	return EXIT_SUCCESS;
	}
	else if (atoi(argv[i]) > 0) {
	local_port = atoi(argv[i]);
	continue;
	}
	else {
	print_usage(argc, argv);
	return EXIT_SUCCESS;
	}
	}

	/* a PORT is mandatory */
	if (!local_port) {
	fprintf(stderr, "Please specify a PORT.\n");
	print_usage(argc, argv);
	goto leave_cleanup;
	}

	/* start services and connect to device */
	ret = idevice_new_with_options(&device, udid, (use_network) ? IDEVICE_LOOKUP_NETWORK : IDEVICE_LOOKUP_USBMUX);
	if (ret != IDEVICE_E_SUCCESS) {
	if (udid) {
	fprintf(stderr, "No device found with udid %s.\n", udid);
	} else {
	fprintf(stderr, "No device found.\n");
	}
	result = EXIT_FAILURE;
	goto leave_cleanup;
	}

	/* create local socket */
	server_fd = socket_create(local_port);
	if (server_fd < 0) {
	fprintf(stderr, "Could not create socket\n");
	result = EXIT_FAILURE;
	goto leave_cleanup;
	}

	while (!quit_flag) {
	debug("%s: Waiting for connection on local port %d\n", __func__, local_port);

	/* wait for client */
	int client_fd = socket_accept(server_fd, local_port);
	if (client_fd < 0) {
	continue;
	}

	debug("%s: Handling new client connection...\n", __func__);

	thread_info_t el = (thread_info_t)malloc(sizeof(thread_info_t));
	if (!el) {
	fprintf(stderr, "Out of memory\n");
	exit(EXIT_FAILURE);
	}
	el->next = NULL;

	if (thread_list) {
	thread_list->next = el;
	} else {
	thread_list = el;
	}

	socket_info_t sinfo = (socket_info_t)malloc(sizeof(socket_info_t));
	if (!sinfo) {
	fprintf(stderr, "Out of memory\n");
	exit(EXIT_FAILURE);
	}
	sinfo->client_fd = client_fd;
	sinfo->device = device;

	if (thread_new(&(el->th), connection_handler, (void*)sinfo) != 0) {
	fprintf(stderr, "Could not start connection handler.\n");
	socket_shutdown(server_fd, SHUT_RDWR);
	socket_close(server_fd);
	break;
	}
	}

	debug("%s: Shutting down debugserver proxy...\n", __func__);

	/* join and clean up threads */
	while (thread_list) {
	thread_info_t *el = thread_list;
	thread_join(el->th);
	thread_free(el->th);
	thread_list = el->next;
	free(el);
	}

	leave_cleanup:
	if (device) {
	idevice_free(device);
	}

	return result;
	}