summaryrefslogtreecommitdiffstats
path: root/daemon/client.c
blob: ac1045a2bed66023c529c8b265b48afe8e43e0b4 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
604
605
606
607
608
609
610
611
612
613
614
615
616
/*
	usbmuxd - iPhone/iPod Touch USB multiplex server daemon

Copyright (C) 2009	Hector Martin "marcan" <hector@marcansoft.com>
Copyright (C) 2009	Nikias Bassen <nikias@gmx.li>

This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation, either version 2 or version 3.

This program 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 General Public License for more details.

You should have received a copy of the GNU General Public License
along with this program; 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

#include <stdlib.h>
#include <string.h>
#include <errno.h>
#include <unistd.h>
#include <sys/types.h>
#include <sys/socket.h>
#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 {
	CLIENT_COMMAND,		// waiting for command
	CLIENT_LISTEN,		// listening for devices
	CLIENT_CONNECTING1,	// issued connection request
	CLIENT_CONNECTING2,	// connection established, but waiting for response message to get sent
	CLIENT_CONNECTED,	// connected
	CLIENT_DEAD
};

struct mux_client {
	int fd;
	unsigned char *ob_buf;
	uint32_t ob_size;
	uint32_t ob_capacity;
	unsigned char *ib_buf;
	uint32_t ib_size;
	uint32_t ib_capacity;
	short events, devents;
	uint32_t connect_tag;
	int connect_device;
	enum client_state state;
	uint32_t proto_version;
};

static struct collection client_list;

int client_read(struct mux_client *client, void *buffer, uint32_t len)
{
	usbmuxd_log(LL_SPEW, "client_read fd %d buf %p len %d", client->fd, buffer, len);
	if(client->state != CLIENT_CONNECTED) {
		usbmuxd_log(LL_ERROR, "Attempted to read from client %d not in CONNECTED state", client->fd);
		return -1;
	}
	return recv(client->fd, buffer, len, 0);
}

int client_write(struct mux_client *client, void *buffer, uint32_t len)
{
	usbmuxd_log(LL_SPEW, "client_write fd %d buf %p len %d", client->fd, buffer, len);
	if(client->state != CLIENT_CONNECTED) {
		usbmuxd_log(LL_ERROR, "Attempted to write to client %d not in CONNECTED state", client->fd);
		return -1;
	}
	return send(client->fd, buffer, len, 0);
}

int client_set_events(struct mux_client *client, short events)
{
	if((client->state != CLIENT_CONNECTED) && (client->state != CLIENT_CONNECTING2)) {
		usbmuxd_log(LL_ERROR, "client_set_events to client %d not in CONNECTED state", client->fd);
		return -1;
	}
	client->devents = events;
	if(client->state == CLIENT_CONNECTED)
		client->events = events;
	return 0;
}

int client_accept(int listenfd)
{
	struct sockaddr_un addr;
	int cfd;
	socklen_t len = sizeof(struct sockaddr_un);
	cfd = accept(listenfd, (struct sockaddr *)&addr, &len);
	if (cfd < 0) {
		usbmuxd_log(LL_ERROR, "accept() failed (%s)", strerror(errno));
		return cfd;
	}

	struct mux_client *client;
	client = malloc(sizeof(struct mux_client));
	memset(client, 0, sizeof(struct mux_client));

	client->fd = cfd;
	client->ob_buf = malloc(REPLY_BUF_SIZE);
	client->ob_size = 0;
	client->ob_capacity = REPLY_BUF_SIZE;
	client->ib_buf = malloc(CMD_BUF_SIZE);
	client->ib_size = 0;
	client->ib_capacity = CMD_BUF_SIZE;
	client->state = CLIENT_COMMAND;
	client->events = POLLIN;

	collection_add(&client_list, client);

	usbmuxd_log(LL_INFO, "New client on fd %d", client->fd);
	return client->fd;
}

void client_close(struct mux_client *client)
{
	usbmuxd_log(LL_INFO, "Disconnecting client fd %d", client->fd);
	if(client->state == CLIENT_CONNECTING1 || client->state == CLIENT_CONNECTING2) {
		usbmuxd_log(LL_INFO, "Client died mid-connect, aborting device %d connection", client->connect_device);
		client->state = CLIENT_DEAD;
		device_abort_connect(client->connect_device, client);
	}
	close(client->fd);
	if(client->ob_buf)
		free(client->ob_buf);
	if(client->ib_buf)
		free(client->ib_buf);
	collection_remove(&client_list, client);
	free(client);
}

void client_get_fds(struct fdlist *list)
{
	FOREACH(struct mux_client *client, &client_list) {
		fdlist_add(list, FD_CLIENT, client->fd, client->events);
	} ENDFOREACH
}

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 = client->proto_version;
	hdr.length = sizeof(hdr) + payload_length;
	hdr.message = msg;
	hdr.tag = tag;
	usbmuxd_log(LL_DEBUG, "send_pkt fd %d tag %d msg %d payload_length %d", client->fd, tag, msg, payload_length);
	if((client->ob_capacity - client->ob_size) < hdr.length) {
		usbmuxd_log(LL_ERROR, "Client %d output buffer full (%d bytes) while sending message %d (%d bytes)", client->fd, client->ob_capacity, hdr.message, hdr.length);
		client_close(client);
		return -1;
	}
	memcpy(client->ob_buf + client->ob_size, &hdr, sizeof(hdr));
	if(payload && payload_length)
		memcpy(client->ob_buf + client->ob_size + sizeof(hdr), payload, payload_length);
	client->ob_size += hdr.length;
	client->events |= POLLOUT;
	return hdr.length;
}

static int send_result(struct mux_client *client, uint32_t tag, uint32_t result)
{
	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)
{
	usbmuxd_log(LL_SPEW, "client_notify_connect fd %d result %d", client->fd, result);
	if(client->state == CLIENT_DEAD)
		return -1;
	if(client->state != CLIENT_CONNECTING1) {
		usbmuxd_log(LL_ERROR, "client_notify_connect when client %d is not in CONNECTING1 state", client->fd);
		return -1;
	}
	if(send_result(client, client->connect_tag, result) < 0)
		return -1;
	if(result == RESULT_OK) {
		client->state = CLIENT_CONNECTING2;
		client->events = POLLOUT; // wait for the result packet to go through
		// no longer need this
		free(client->ib_buf);
		client->ib_buf = NULL;
	} else {
		client->state = CLIENT_COMMAND;
	}
	return 0;
}

static int notify_device_add(struct mux_client *client, struct device_info *dev)
{
	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)
{
	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)
{
	struct device_info *devs;
	struct device_info *dev;
	int count, i;

	client->state = CLIENT_LISTEN;
	count = device_get_count();
	if(!count)
		return 0;
	devs = malloc(sizeof(struct device_info) * count);
	count = device_get_list(devs);

	// going to need a larger buffer for many devices
	int needed_buffer = count * (sizeof(struct usbmuxd_device_record) + sizeof(struct usbmuxd_header)) + REPLY_BUF_SIZE;
	if(client->ob_capacity < needed_buffer) {
		usbmuxd_log(LL_DEBUG, "Enlarging client %d reply buffer %d -> %d to make space for device notifications", client->fd, client->ob_capacity, needed_buffer);
		client->ob_buf = realloc(client->ob_buf, needed_buffer);
		client->ob_capacity = needed_buffer;
	}
	dev = devs;
	for(i=0; i<count; i++) {
		if(notify_device_add(client, dev++) < 0) {
			free(devs);
			return -1;
		}
	}
	free(devs);
	return count;
}

static int client_command(struct mux_client *client, struct usbmuxd_header *hdr)
{
	int res;
	usbmuxd_log(LL_DEBUG, "Client command in fd %d len %d ver %d msg %d tag %d", client->fd, hdr->length, hdr->version, hdr->message, hdr->tag);

	if(client->state != CLIENT_COMMAND) {
		usbmuxd_log(LL_ERROR, "Client %d command received in the wrong state", client->fd);
		if(send_result(client, hdr->tag, RESULT_BADCOMMAND) < 0)
			return -1;
		client_close(client);
		return -1;
	}

	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;
			usbmuxd_log(LL_DEBUG, "Client %d now LISTENING", client->fd);
			return start_listen(client);
		case MESSAGE_CONNECT:
			ch = (void*)hdr;
			usbmuxd_log(LL_DEBUG, "Client %d connection request to device %d port %d", client->fd, ch->device_id, ntohs(ch->port));
			res = device_start_connect(ch->device_id, ntohs(ch->port), client);
			if(res < 0) {
				if(send_result(client, hdr->tag, -res) < 0)
					return -1;
			} else {
				client->connect_tag = hdr->tag;
				client->connect_device = ch->device_id;
				client->state = CLIENT_CONNECTING1;
			}
			return 0;
		default:
			usbmuxd_log(LL_ERROR, "Client %d invalid command %d", client->fd, hdr->message);
			if(send_result(client, hdr->tag, RESULT_BADCOMMAND) < 0)
				return -1;
			return 0;
	}
	return -1;
}

static void process_send(struct mux_client *client)
{
	int res;
	if(!client->ob_size) {
		usbmuxd_log(LL_WARNING, "Client %d OUT process but nothing to send?", client->fd);
		client->events &= ~POLLOUT;
		return;
	}
	res = send(client->fd, client->ob_buf, client->ob_size, 0);
	if(res <= 0) {
		usbmuxd_log(LL_ERROR, "Send to client fd %d failed: %d %s", client->fd, res, strerror(errno));
		client_close(client);
		return;
	}
	if(res == client->ob_size) {
		client->ob_size = 0;
		client->events &= ~POLLOUT;
		if(client->state == CLIENT_CONNECTING2) {
			usbmuxd_log(LL_DEBUG, "Client %d switching to CONNECTED state", client->fd);
			client->state = CLIENT_CONNECTED;
			client->events = client->devents;
			// no longer need this
			free(client->ob_buf);
			client->ob_buf = NULL;
		}
	} else {
		client->ob_size -= res;
		memmove(client->ob_buf, client->ob_buf + res, client->ob_size);
	}
}
static void process_recv(struct mux_client *client)
{
	int res;
	int did_read = 0;
	if(client->ib_size < sizeof(struct usbmuxd_header)) {
		res = recv(client->fd, client->ib_buf + client->ib_size, sizeof(struct usbmuxd_header) - client->ib_size, 0);
		if(res <= 0) {
			if(res < 0)
				usbmuxd_log(LL_ERROR, "Receive from client fd %d failed: %s", client->fd, strerror(errno));
			else
				usbmuxd_log(LL_INFO, "Client %d connection closed", client->fd);
			client_close(client);
			return;
		}
		client->ib_size += res;
		if(client->ib_size < sizeof(struct usbmuxd_header))
			return;
		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);
		return;
	}
	if(hdr->length > client->ib_capacity) {
		usbmuxd_log(LL_INFO, "Client %d message is too long (%d bytes)", client->fd, hdr->length);
		client_close(client);
		return;
	}
	if(hdr->length < sizeof(struct usbmuxd_header)) {
		usbmuxd_log(LL_ERROR, "Client %d message is too short (%d bytes)", client->fd, hdr->length);
		client_close(client);
		return;
	}
	if(client->ib_size < hdr->length) {
		if(did_read)
			return; //maybe we would block, so defer to next loop
		res = recv(client->fd, client->ib_buf + client->ib_size, hdr->length - client->ib_size, 0);
		if(res < 0) {
			usbmuxd_log(LL_ERROR, "Receive from client fd %d failed: %s", client->fd, strerror(errno));
			client_close(client);
			return;
		} else if(res == 0) {
			usbmuxd_log(LL_INFO, "Client %d connection closed", client->fd);
			client_close(client);
			return;
		}
		client->ib_size += res;
		if(client->ib_size < hdr->length)
			return;
	}
	client_command(client, hdr);
	client->ib_size = 0;
}

void client_process(int fd, short events)
{
	struct mux_client *client = NULL;
	FOREACH(struct mux_client *lc, &client_list) {
		if(lc->fd == fd) {
			client = lc;
			break;
		}
	} ENDFOREACH

	if(!client) {
		usbmuxd_log(LL_INFO, "client_process: fd %d not found in client list", fd);
		return;
	}

	if(client->state == CLIENT_CONNECTED) {
		usbmuxd_log(LL_SPEW, "client_process in CONNECTED state");
		device_client_process(client->connect_device, client, events);
	} else {
		if(events & POLLIN) {
			process_recv(client);
		} else if(events & POLLOUT) { //not both in case client died as part of process_recv
			process_send(client);
		}
	}

}

void client_device_add(struct device_info *dev)
{
	usbmuxd_log(LL_DEBUG, "client_device_add: id %d, location 0x%x, serial %s", dev->id, dev->location, dev->serial);
	FOREACH(struct mux_client *client, &client_list) {
		if(client->state == CLIENT_LISTEN)
			notify_device_add(client, dev);
	} ENDFOREACH
}
void client_device_remove(int device_id)
{
	uint32_t id = device_id;
	usbmuxd_log(LL_DEBUG, "client_device_remove: id %d", device_id);
	FOREACH(struct mux_client *client, &client_list) {
		if(client->state == CLIENT_LISTEN)
			notify_device_remove(client, id);
	} ENDFOREACH
}


void client_init(void)
{
	usbmuxd_log(LL_DEBUG, "client_init");
	collection_init(&client_list);
}

void client_shutdown(void)
{
	usbmuxd_log(LL_DEBUG, "client_shutdown");
	FOREACH(struct mux_client *client, &client_list) {
		client_close(client);
	} ENDFOREACH
	collection_free(&client_list);
}