summaryrefslogtreecommitdiffstats
path: root/tools/usb/usbip/src/usbipd.c
blob: c6dad2a13c801693e5f99ae445ed2b7a247978f8 (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
617
618
619
620
621
622
623
624
625
626
627
628
629
630
631
632
633
634
635
636
637
638
639
640
641
642
643
644
645
646
647
648
649
650
651
652
653
654
655
656
657
658
659
660
661
662
663
664
665
666
667
668
669
670
671
672
673
674
675
676
677
678
679
680
681
682
683
684
/*
 * Copyright (C) 2011 matt mooney <mfm@muteddisk.com>
 *               2005-2007 Takahiro Hirofuchi
 * Copyright (C) 2015-2016 Samsung Electronics
 *               Igor Kotrasinski <i.kotrasinsk@samsung.com>
 *               Krzysztof Opasiak <k.opasiak@samsung.com>
 *
 * 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 of the License, or
 * (at your option) any later version.
 *
 * 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, see <http://www.gnu.org/licenses/>.
 */

#ifdef HAVE_CONFIG_H
#include "../config.h"
#endif

#define _GNU_SOURCE
#include <errno.h>
#include <unistd.h>
#include <netdb.h>
#include <string.h>
#include <stdlib.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <arpa/inet.h>
#include <sys/socket.h>
#include <netinet/in.h>

#ifdef HAVE_LIBWRAP
#include <tcpd.h>
#endif

#include <getopt.h>
#include <signal.h>
#include <poll.h>

#include "usbip_host_driver.h"
#include "usbip_host_common.h"
#include "usbip_device_driver.h"
#include "usbip_common.h"
#include "usbip_network.h"
#include "list.h"

#undef  PROGNAME
#define PROGNAME "usbipd"
#define MAXSOCKFD 20

#define MAIN_LOOP_TIMEOUT 10

#define DEFAULT_PID_FILE "/var/run/" PROGNAME ".pid"

static const char usbip_version_string[] = PACKAGE_STRING;

static const char usbipd_help_string[] =
	"usage: usbipd [options]\n"
	"\n"
	"	-4, --ipv4\n"
	"		Bind to IPv4. Default is both.\n"
	"\n"
	"	-6, --ipv6\n"
	"		Bind to IPv6. Default is both.\n"
	"\n"
	"	-e, --device\n"
	"		Run in device mode.\n"
	"		Rather than drive an attached device, create\n"
	"		a virtual UDC to bind gadgets to.\n"
	"\n"
	"	-D, --daemon\n"
	"		Run as a daemon process.\n"
	"\n"
	"	-d, --debug\n"
	"		Print debugging information.\n"
	"\n"
	"	-PFILE, --pid FILE\n"
	"		Write process id to FILE.\n"
	"		If no FILE specified, use " DEFAULT_PID_FILE "\n"
	"\n"
	"	-tPORT, --tcp-port PORT\n"
	"		Listen on TCP/IP port PORT.\n"
	"\n"
	"	-h, --help\n"
	"		Print this help.\n"
	"\n"
	"	-v, --version\n"
	"		Show version.\n";

static struct usbip_host_driver *driver;

static void usbipd_help(void)
{
	printf("%s\n", usbipd_help_string);
}

static int recv_request_import(int sockfd)
{
	struct op_import_request req;
	struct usbip_exported_device *edev;
	struct usbip_usb_device pdu_udev;
	struct list_head *i;
	int found = 0;
	int error = 0;
	int rc;

	memset(&req, 0, sizeof(req));

	rc = usbip_net_recv(sockfd, &req, sizeof(req));
	if (rc < 0) {
		dbg("usbip_net_recv failed: import request");
		return -1;
	}
	PACK_OP_IMPORT_REQUEST(0, &req);

	list_for_each(i, &driver->edev_list) {
		edev = list_entry(i, struct usbip_exported_device, node);
		if (!strncmp(req.busid, edev->udev.busid, SYSFS_BUS_ID_SIZE)) {
			info("found requested device: %s", req.busid);
			found = 1;
			break;
		}
	}

	if (found) {
		/* should set TCP_NODELAY for usbip */
		usbip_net_set_nodelay(sockfd);

		/* export device needs a TCP/IP socket descriptor */
		rc = usbip_export_device(edev, sockfd);
		if (rc < 0)
			error = 1;
	} else {
		info("requested device not found: %s", req.busid);
		error = 1;
	}

	rc = usbip_net_send_op_common(sockfd, OP_REP_IMPORT,
				      (!error ? ST_OK : ST_NA));
	if (rc < 0) {
		dbg("usbip_net_send_op_common failed: %#0x", OP_REP_IMPORT);
		return -1;
	}

	if (error) {
		dbg("import request busid %s: failed", req.busid);
		return -1;
	}

	memcpy(&pdu_udev, &edev->udev, sizeof(pdu_udev));
	usbip_net_pack_usb_device(1, &pdu_udev);

	rc = usbip_net_send(sockfd, &pdu_udev, sizeof(pdu_udev));
	if (rc < 0) {
		dbg("usbip_net_send failed: devinfo");
		return -1;
	}

	dbg("import request busid %s: complete", req.busid);

	return 0;
}

static int send_reply_devlist(int connfd)
{
	struct usbip_exported_device *edev;
	struct usbip_usb_device pdu_udev;
	struct usbip_usb_interface pdu_uinf;
	struct op_devlist_reply reply;
	struct list_head *j;
	int rc, i;

	reply.ndev = 0;
	/* number of exported devices */
	list_for_each(j, &driver->edev_list) {
		reply.ndev += 1;
	}
	info("exportable devices: %d", reply.ndev);

	rc = usbip_net_send_op_common(connfd, OP_REP_DEVLIST, ST_OK);
	if (rc < 0) {
		dbg("usbip_net_send_op_common failed: %#0x", OP_REP_DEVLIST);
		return -1;
	}
	PACK_OP_DEVLIST_REPLY(1, &reply);

	rc = usbip_net_send(connfd, &reply, sizeof(reply));
	if (rc < 0) {
		dbg("usbip_net_send failed: %#0x", OP_REP_DEVLIST);
		return -1;
	}

	list_for_each(j, &driver->edev_list) {
		edev = list_entry(j, struct usbip_exported_device, node);
		dump_usb_device(&edev->udev);
		memcpy(&pdu_udev, &edev->udev, sizeof(pdu_udev));
		usbip_net_pack_usb_device(1, &pdu_udev);

		rc = usbip_net_send(connfd, &pdu_udev, sizeof(pdu_udev));
		if (rc < 0) {
			dbg("usbip_net_send failed: pdu_udev");
			return -1;
		}

		for (i = 0; i < edev->udev.bNumInterfaces; i++) {
			dump_usb_interface(&edev->uinf[i]);
			memcpy(&pdu_uinf, &edev->uinf[i], sizeof(pdu_uinf));
			usbip_net_pack_usb_interface(1, &pdu_uinf);

			rc = usbip_net_send(connfd, &pdu_uinf,
					sizeof(pdu_uinf));
			if (rc < 0) {
				err("usbip_net_send failed: pdu_uinf");
				return -1;
			}
		}
	}

	return 0;
}

static int recv_request_devlist(int connfd)
{
	struct op_devlist_request req;
	int rc;

	memset(&req, 0, sizeof(req));

	rc = usbip_net_recv(connfd, &req, sizeof(req));
	if (rc < 0) {
		dbg("usbip_net_recv failed: devlist request");
		return -1;
	}

	rc = send_reply_devlist(connfd);
	if (rc < 0) {
		dbg("send_reply_devlist failed");
		return -1;
	}

	return 0;
}

static int recv_pdu(int connfd)
{
	uint16_t code = OP_UNSPEC;
	int ret;

	ret = usbip_net_recv_op_common(connfd, &code);
	if (ret < 0) {
		dbg("could not receive opcode: %#0x", code);
		return -1;
	}

	ret = usbip_refresh_device_list(driver);
	if (ret < 0) {
		dbg("could not refresh device list: %d", ret);
		return -1;
	}

	info("received request: %#0x(%d)", code, connfd);
	switch (code) {
	case OP_REQ_DEVLIST:
		ret = recv_request_devlist(connfd);
		break;
	case OP_REQ_IMPORT:
		ret = recv_request_import(connfd);
		break;
	case OP_REQ_DEVINFO:
	case OP_REQ_CRYPKEY:
	default:
		err("received an unknown opcode: %#0x", code);
		ret = -1;
	}

	if (ret == 0)
		info("request %#0x(%d): complete", code, connfd);
	else
		info("request %#0x(%d): failed", code, connfd);

	return ret;
}

#ifdef HAVE_LIBWRAP
static int tcpd_auth(int connfd)
{
	struct request_info request;
	int rc;

	request_init(&request, RQ_DAEMON, PROGNAME, RQ_FILE, connfd, 0);
	fromhost(&request);
	rc = hosts_access(&request);
	if (rc == 0)
		return -1;

	return 0;
}
#endif

static int do_accept(int listenfd)
{
	int connfd;
	struct sockaddr_storage ss;
	socklen_t len = sizeof(ss);
	char host[NI_MAXHOST], port[NI_MAXSERV];
	int rc;

	memset(&ss, 0, sizeof(ss));

	connfd = accept(listenfd, (struct sockaddr *)&ss, &len);
	if (connfd < 0) {
		err("failed to accept connection");
		return -1;
	}

	rc = getnameinfo((struct sockaddr *)&ss, len, host, sizeof(host),
			 port, sizeof(port), NI_NUMERICHOST | NI_NUMERICSERV);
	if (rc)
		err("getnameinfo: %s", gai_strerror(rc));

#ifdef HAVE_LIBWRAP
	rc = tcpd_auth(connfd);
	if (rc < 0) {
		info("denied access from %s", host);
		close(connfd);
		return -1;
	}
#endif
	info("connection from %s:%s", host, port);

	return connfd;
}

int process_request(int listenfd)
{
	pid_t childpid;
	int connfd;

	connfd = do_accept(listenfd);
	if (connfd < 0)
		return -1;
	childpid = fork();
	if (childpid == 0) {
		close(listenfd);
		recv_pdu(connfd);
		exit(0);
	}
	close(connfd);
	return 0;
}

static void addrinfo_to_text(struct addrinfo *ai, char buf[],
			     const size_t buf_size)
{
	char hbuf[NI_MAXHOST];
	char sbuf[NI_MAXSERV];
	int rc;

	buf[0] = '\0';

	rc = getnameinfo(ai->ai_addr, ai->ai_addrlen, hbuf, sizeof(hbuf),
			 sbuf, sizeof(sbuf), NI_NUMERICHOST | NI_NUMERICSERV);
	if (rc)
		err("getnameinfo: %s", gai_strerror(rc));

	snprintf(buf, buf_size, "%s:%s", hbuf, sbuf);
}

static int listen_all_addrinfo(struct addrinfo *ai_head, int sockfdlist[],
			     int maxsockfd)
{
	struct addrinfo *ai;
	int ret, nsockfd = 0;
	const size_t ai_buf_size = NI_MAXHOST + NI_MAXSERV + 2;
	char ai_buf[ai_buf_size];

	for (ai = ai_head; ai && nsockfd < maxsockfd; ai = ai->ai_next) {
		int sock;

		addrinfo_to_text(ai, ai_buf, ai_buf_size);
		dbg("opening %s", ai_buf);
		sock = socket(ai->ai_family, ai->ai_socktype, ai->ai_protocol);
		if (sock < 0) {
			err("socket: %s: %d (%s)",
			    ai_buf, errno, strerror(errno));
			continue;
		}

		usbip_net_set_reuseaddr(sock);
		usbip_net_set_nodelay(sock);
		/* We use seperate sockets for IPv4 and IPv6
		 * (see do_standalone_mode()) */
		usbip_net_set_v6only(sock);

		ret = bind(sock, ai->ai_addr, ai->ai_addrlen);
		if (ret < 0) {
			err("bind: %s: %d (%s)",
			    ai_buf, errno, strerror(errno));
			close(sock);
			continue;
		}

		ret = listen(sock, SOMAXCONN);
		if (ret < 0) {
			err("listen: %s: %d (%s)",
			    ai_buf, errno, strerror(errno));
			close(sock);
			continue;
		}

		info("listening on %s", ai_buf);
		sockfdlist[nsockfd++] = sock;
	}

	return nsockfd;
}

static struct addrinfo *do_getaddrinfo(char *host, int ai_family)
{
	struct addrinfo hints, *ai_head;
	int rc;

	memset(&hints, 0, sizeof(hints));
	hints.ai_family   = ai_family;
	hints.ai_socktype = SOCK_STREAM;
	hints.ai_flags    = AI_PASSIVE;

	rc = getaddrinfo(host, usbip_port_string, &hints, &ai_head);
	if (rc) {
		err("failed to get a network address %s: %s", usbip_port_string,
		    gai_strerror(rc));
		return NULL;
	}

	return ai_head;
}

static void signal_handler(int i)
{
	dbg("received '%s' signal", strsignal(i));
}

static void set_signal(void)
{
	struct sigaction act;

	memset(&act, 0, sizeof(act));
	act.sa_handler = signal_handler;
	sigemptyset(&act.sa_mask);
	sigaction(SIGTERM, &act, NULL);
	sigaction(SIGINT, &act, NULL);
	act.sa_handler = SIG_IGN;
	sigaction(SIGCHLD, &act, NULL);
}

static const char *pid_file;

static void write_pid_file(void)
{
	if (pid_file) {
		dbg("creating pid file %s", pid_file);
		FILE *fp;

		fp = fopen(pid_file, "w");
		if (!fp) {
			err("pid_file: %s: %d (%s)",
			    pid_file, errno, strerror(errno));
			return;
		}
		fprintf(fp, "%d\n", getpid());
		fclose(fp);
	}
}

static void remove_pid_file(void)
{
	if (pid_file) {
		dbg("removing pid file %s", pid_file);
		unlink(pid_file);
	}
}

static int do_standalone_mode(int daemonize, int ipv4, int ipv6)
{
	struct addrinfo *ai_head;
	int sockfdlist[MAXSOCKFD];
	int nsockfd, family;
	int i, terminate;
	struct pollfd *fds;
	struct timespec timeout;
	sigset_t sigmask;

	if (usbip_driver_open(driver))
		return -1;

	if (daemonize) {
		if (daemon(0, 0) < 0) {
			err("daemonizing failed: %s", strerror(errno));
			usbip_driver_close(driver);
			return -1;
		}
		umask(0);
		usbip_use_syslog = 1;
	}
	set_signal();
	write_pid_file();

	info("starting " PROGNAME " (%s)", usbip_version_string);

	/*
	 * To suppress warnings on systems with bindv6only disabled
	 * (default), we use seperate sockets for IPv6 and IPv4 and set
	 * IPV6_V6ONLY on the IPv6 sockets.
	 */
	if (ipv4 && ipv6)
		family = AF_UNSPEC;
	else if (ipv4)
		family = AF_INET;
	else
		family = AF_INET6;

	ai_head = do_getaddrinfo(NULL, family);
	if (!ai_head) {
		usbip_driver_close(driver);
		return -1;
	}
	nsockfd = listen_all_addrinfo(ai_head, sockfdlist,
		sizeof(sockfdlist) / sizeof(*sockfdlist));
	freeaddrinfo(ai_head);
	if (nsockfd <= 0) {
		err("failed to open a listening socket");
		usbip_driver_close(driver);
		return -1;
	}

	dbg("listening on %d address%s", nsockfd, (nsockfd == 1) ? "" : "es");

	fds = calloc(nsockfd, sizeof(struct pollfd));
	for (i = 0; i < nsockfd; i++) {
		fds[i].fd = sockfdlist[i];
		fds[i].events = POLLIN;
	}
	timeout.tv_sec = MAIN_LOOP_TIMEOUT;
	timeout.tv_nsec = 0;

	sigfillset(&sigmask);
	sigdelset(&sigmask, SIGTERM);
	sigdelset(&sigmask, SIGINT);

	terminate = 0;
	while (!terminate) {
		int r;

		r = ppoll(fds, nsockfd, &timeout, &sigmask);
		if (r < 0) {
			dbg("%s", strerror(errno));
			terminate = 1;
		} else if (r) {
			for (i = 0; i < nsockfd; i++) {
				if (fds[i].revents & POLLIN) {
					dbg("read event on fd[%d]=%d",
					    i, sockfdlist[i]);
					process_request(sockfdlist[i]);
				}
			}
		} else {
			dbg("heartbeat timeout on ppoll()");
		}
	}

	info("shutting down " PROGNAME);
	free(fds);
	usbip_driver_close(driver);

	return 0;
}

int main(int argc, char *argv[])
{
	static const struct option longopts[] = {
		{ "ipv4",     no_argument,       NULL, '4' },
		{ "ipv6",     no_argument,       NULL, '6' },
		{ "daemon",   no_argument,       NULL, 'D' },
		{ "daemon",   no_argument,       NULL, 'D' },
		{ "debug",    no_argument,       NULL, 'd' },
		{ "device",   no_argument,       NULL, 'e' },
		{ "pid",      optional_argument, NULL, 'P' },
		{ "tcp-port", required_argument, NULL, 't' },
		{ "help",     no_argument,       NULL, 'h' },
		{ "version",  no_argument,       NULL, 'v' },
		{ NULL,	      0,                 NULL,  0  }
	};

	enum {
		cmd_standalone_mode = 1,
		cmd_help,
		cmd_version
	} cmd;

	int daemonize = 0;
	int ipv4 = 0, ipv6 = 0;
	int opt, rc = -1;

	pid_file = NULL;

	usbip_use_stderr = 1;
	usbip_use_syslog = 0;

	if (geteuid() != 0)
		err("not running as root?");

	cmd = cmd_standalone_mode;
	driver = &host_driver;
	for (;;) {
		opt = getopt_long(argc, argv, "46DdeP::t:hv", longopts, NULL);

		if (opt == -1)
			break;

		switch (opt) {
		case '4':
			ipv4 = 1;
			break;
		case '6':
			ipv6 = 1;
			break;
		case 'D':
			daemonize = 1;
			break;
		case 'd':
			usbip_use_debug = 1;
			break;
		case 'h':
			cmd = cmd_help;
			break;
		case 'P':
			pid_file = optarg ? optarg : DEFAULT_PID_FILE;
			break;
		case 't':
			usbip_setup_port_number(optarg);
			break;
		case 'v':
			cmd = cmd_version;
			break;
		case 'e':
			driver = &device_driver;
			break;
		case '?':
			usbipd_help();
		default:
			goto err_out;
		}
	}

	if (!ipv4 && !ipv6)
		ipv4 = ipv6 = 1;

	switch (cmd) {
	case cmd_standalone_mode:
		rc = do_standalone_mode(daemonize, ipv4, ipv6);
		remove_pid_file();
		break;
	case cmd_version:
		printf(PROGNAME " (%s)\n", usbip_version_string);
		rc = 0;
		break;
	case cmd_help:
		usbipd_help();
		rc = 0;
		break;
	default:
		usbipd_help();
		goto err_out;
	}

err_out:
	return (rc > -1 ? EXIT_SUCCESS : EXIT_FAILURE);
}