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19#ifdef HAVE_CONFIG_H
20#include "../config.h"
21#endif
22
23#define _GNU_SOURCE
24#include <errno.h>
25#include <unistd.h>
26#include <netdb.h>
27#include <string.h>
28#include <stdlib.h>
29#include <sys/types.h>
30#include <sys/stat.h>
31#include <arpa/inet.h>
32#include <sys/socket.h>
33#include <netinet/in.h>
34
35#ifdef HAVE_LIBWRAP
36#include <tcpd.h>
37#endif
38
39#include <getopt.h>
40#include <signal.h>
41#include <poll.h>
42
43#include "usbip_host_driver.h"
44#include "usbip_common.h"
45#include "usbip_network.h"
46#include "list.h"
47
48#undef PROGNAME
49#define PROGNAME "usbipd"
50#define MAXSOCKFD 20
51
52#define MAIN_LOOP_TIMEOUT 10
53
54#define DEFAULT_PID_FILE "/var/run/" PROGNAME ".pid"
55
56static const char usbip_version_string[] = PACKAGE_STRING;
57
58static const char usbipd_help_string[] =
59 "usage: usbipd [options]\n"
60 "\n"
61 " -4, --ipv4\n"
62 " Bind to IPv4. Default is both.\n"
63 "\n"
64 " -6, --ipv6\n"
65 " Bind to IPv6. Default is both.\n"
66 "\n"
67 " -D, --daemon\n"
68 " Run as a daemon process.\n"
69 "\n"
70 " -d, --debug\n"
71 " Print debugging information.\n"
72 "\n"
73 " -PFILE, --pid FILE\n"
74 " Write process id to FILE.\n"
75 " If no FILE specified, use " DEFAULT_PID_FILE "\n"
76 "\n"
77 " -tPORT, --tcp-port PORT\n"
78 " Listen on TCP/IP port PORT.\n"
79 "\n"
80 " -h, --help\n"
81 " Print this help.\n"
82 "\n"
83 " -v, --version\n"
84 " Show version.\n";
85
86static void usbipd_help(void)
87{
88 printf("%s\n", usbipd_help_string);
89}
90
91static int recv_request_import(int sockfd)
92{
93 struct op_import_request req;
94 struct usbip_exported_device *edev;
95 struct usbip_usb_device pdu_udev;
96 struct list_head *i;
97 int found = 0;
98 int error = 0;
99 int rc;
100
101 memset(&req, 0, sizeof(req));
102
103 rc = usbip_net_recv(sockfd, &req, sizeof(req));
104 if (rc < 0) {
105 dbg("usbip_net_recv failed: import request");
106 return -1;
107 }
108 PACK_OP_IMPORT_REQUEST(0, &req);
109
110 list_for_each(i, &host_driver->edev_list) {
111 edev = list_entry(i, struct usbip_exported_device, node);
112 if (!strncmp(req.busid, edev->udev.busid, SYSFS_BUS_ID_SIZE)) {
113 info("found requested device: %s", req.busid);
114 found = 1;
115 break;
116 }
117 }
118
119 if (found) {
120
121 usbip_net_set_nodelay(sockfd);
122
123
124 rc = usbip_host_export_device(edev, sockfd);
125 if (rc < 0)
126 error = 1;
127 } else {
128 info("requested device not found: %s", req.busid);
129 error = 1;
130 }
131
132 rc = usbip_net_send_op_common(sockfd, OP_REP_IMPORT,
133 (!error ? ST_OK : ST_NA));
134 if (rc < 0) {
135 dbg("usbip_net_send_op_common failed: %#0x", OP_REP_IMPORT);
136 return -1;
137 }
138
139 if (error) {
140 dbg("import request busid %s: failed", req.busid);
141 return -1;
142 }
143
144 memcpy(&pdu_udev, &edev->udev, sizeof(pdu_udev));
145 usbip_net_pack_usb_device(1, &pdu_udev);
146
147 rc = usbip_net_send(sockfd, &pdu_udev, sizeof(pdu_udev));
148 if (rc < 0) {
149 dbg("usbip_net_send failed: devinfo");
150 return -1;
151 }
152
153 dbg("import request busid %s: complete", req.busid);
154
155 return 0;
156}
157
158static int send_reply_devlist(int connfd)
159{
160 struct usbip_exported_device *edev;
161 struct usbip_usb_device pdu_udev;
162 struct usbip_usb_interface pdu_uinf;
163 struct op_devlist_reply reply;
164 struct list_head *j;
165 int rc, i;
166
167 reply.ndev = 0;
168
169 list_for_each(j, &host_driver->edev_list) {
170 reply.ndev += 1;
171 }
172 info("exportable devices: %d", reply.ndev);
173
174 rc = usbip_net_send_op_common(connfd, OP_REP_DEVLIST, ST_OK);
175 if (rc < 0) {
176 dbg("usbip_net_send_op_common failed: %#0x", OP_REP_DEVLIST);
177 return -1;
178 }
179 PACK_OP_DEVLIST_REPLY(1, &reply);
180
181 rc = usbip_net_send(connfd, &reply, sizeof(reply));
182 if (rc < 0) {
183 dbg("usbip_net_send failed: %#0x", OP_REP_DEVLIST);
184 return -1;
185 }
186
187 list_for_each(j, &host_driver->edev_list) {
188 edev = list_entry(j, struct usbip_exported_device, node);
189 dump_usb_device(&edev->udev);
190 memcpy(&pdu_udev, &edev->udev, sizeof(pdu_udev));
191 usbip_net_pack_usb_device(1, &pdu_udev);
192
193 rc = usbip_net_send(connfd, &pdu_udev, sizeof(pdu_udev));
194 if (rc < 0) {
195 dbg("usbip_net_send failed: pdu_udev");
196 return -1;
197 }
198
199 for (i = 0; i < edev->udev.bNumInterfaces; i++) {
200 dump_usb_interface(&edev->uinf[i]);
201 memcpy(&pdu_uinf, &edev->uinf[i], sizeof(pdu_uinf));
202 usbip_net_pack_usb_interface(1, &pdu_uinf);
203
204 rc = usbip_net_send(connfd, &pdu_uinf,
205 sizeof(pdu_uinf));
206 if (rc < 0) {
207 err("usbip_net_send failed: pdu_uinf");
208 return -1;
209 }
210 }
211 }
212
213 return 0;
214}
215
216static int recv_request_devlist(int connfd)
217{
218 struct op_devlist_request req;
219 int rc;
220
221 memset(&req, 0, sizeof(req));
222
223 rc = usbip_net_recv(connfd, &req, sizeof(req));
224 if (rc < 0) {
225 dbg("usbip_net_recv failed: devlist request");
226 return -1;
227 }
228
229 rc = send_reply_devlist(connfd);
230 if (rc < 0) {
231 dbg("send_reply_devlist failed");
232 return -1;
233 }
234
235 return 0;
236}
237
238static int recv_pdu(int connfd)
239{
240 uint16_t code = OP_UNSPEC;
241 int ret;
242
243 ret = usbip_net_recv_op_common(connfd, &code);
244 if (ret < 0) {
245 dbg("could not receive opcode: %#0x", code);
246 return -1;
247 }
248
249 ret = usbip_host_refresh_device_list();
250 if (ret < 0) {
251 dbg("could not refresh device list: %d", ret);
252 return -1;
253 }
254
255 info("received request: %#0x(%d)", code, connfd);
256 switch (code) {
257 case OP_REQ_DEVLIST:
258 ret = recv_request_devlist(connfd);
259 break;
260 case OP_REQ_IMPORT:
261 ret = recv_request_import(connfd);
262 break;
263 case OP_REQ_DEVINFO:
264 case OP_REQ_CRYPKEY:
265 default:
266 err("received an unknown opcode: %#0x", code);
267 ret = -1;
268 }
269
270 if (ret == 0)
271 info("request %#0x(%d): complete", code, connfd);
272 else
273 info("request %#0x(%d): failed", code, connfd);
274
275 return ret;
276}
277
278#ifdef HAVE_LIBWRAP
279static int tcpd_auth(int connfd)
280{
281 struct request_info request;
282 int rc;
283
284 request_init(&request, RQ_DAEMON, PROGNAME, RQ_FILE, connfd, 0);
285 fromhost(&request);
286 rc = hosts_access(&request);
287 if (rc == 0)
288 return -1;
289
290 return 0;
291}
292#endif
293
294static int do_accept(int listenfd)
295{
296 int connfd;
297 struct sockaddr_storage ss;
298 socklen_t len = sizeof(ss);
299 char host[NI_MAXHOST], port[NI_MAXSERV];
300 int rc;
301
302 memset(&ss, 0, sizeof(ss));
303
304 connfd = accept(listenfd, (struct sockaddr *)&ss, &len);
305 if (connfd < 0) {
306 err("failed to accept connection");
307 return -1;
308 }
309
310 rc = getnameinfo((struct sockaddr *)&ss, len, host, sizeof(host),
311 port, sizeof(port), NI_NUMERICHOST | NI_NUMERICSERV);
312 if (rc)
313 err("getnameinfo: %s", gai_strerror(rc));
314
315#ifdef HAVE_LIBWRAP
316 rc = tcpd_auth(connfd);
317 if (rc < 0) {
318 info("denied access from %s", host);
319 close(connfd);
320 return -1;
321 }
322#endif
323 info("connection from %s:%s", host, port);
324
325 return connfd;
326}
327
328int process_request(int listenfd)
329{
330 pid_t childpid;
331 int connfd;
332
333 connfd = do_accept(listenfd);
334 if (connfd < 0)
335 return -1;
336 childpid = fork();
337 if (childpid == 0) {
338 close(listenfd);
339 recv_pdu(connfd);
340 exit(0);
341 }
342 close(connfd);
343 return 0;
344}
345
346static void addrinfo_to_text(struct addrinfo *ai, char buf[],
347 const size_t buf_size)
348{
349 char hbuf[NI_MAXHOST];
350 char sbuf[NI_MAXSERV];
351 int rc;
352
353 buf[0] = '\0';
354
355 rc = getnameinfo(ai->ai_addr, ai->ai_addrlen, hbuf, sizeof(hbuf),
356 sbuf, sizeof(sbuf), NI_NUMERICHOST | NI_NUMERICSERV);
357 if (rc)
358 err("getnameinfo: %s", gai_strerror(rc));
359
360 snprintf(buf, buf_size, "%s:%s", hbuf, sbuf);
361}
362
363static int listen_all_addrinfo(struct addrinfo *ai_head, int sockfdlist[],
364 int maxsockfd)
365{
366 struct addrinfo *ai;
367 int ret, nsockfd = 0;
368 const size_t ai_buf_size = NI_MAXHOST + NI_MAXSERV + 2;
369 char ai_buf[ai_buf_size];
370
371 for (ai = ai_head; ai && nsockfd < maxsockfd; ai = ai->ai_next) {
372 int sock;
373
374 addrinfo_to_text(ai, ai_buf, ai_buf_size);
375 dbg("opening %s", ai_buf);
376 sock = socket(ai->ai_family, ai->ai_socktype, ai->ai_protocol);
377 if (sock < 0) {
378 err("socket: %s: %d (%s)",
379 ai_buf, errno, strerror(errno));
380 continue;
381 }
382
383 usbip_net_set_reuseaddr(sock);
384 usbip_net_set_nodelay(sock);
385
386
387 usbip_net_set_v6only(sock);
388
389 if (sock >= FD_SETSIZE) {
390 err("FD_SETSIZE: %s: sock=%d, max=%d",
391 ai_buf, sock, FD_SETSIZE);
392 close(sock);
393 continue;
394 }
395
396 ret = bind(sock, ai->ai_addr, ai->ai_addrlen);
397 if (ret < 0) {
398 err("bind: %s: %d (%s)",
399 ai_buf, errno, strerror(errno));
400 close(sock);
401 continue;
402 }
403
404 ret = listen(sock, SOMAXCONN);
405 if (ret < 0) {
406 err("listen: %s: %d (%s)",
407 ai_buf, errno, strerror(errno));
408 close(sock);
409 continue;
410 }
411
412 info("listening on %s", ai_buf);
413 sockfdlist[nsockfd++] = sock;
414 }
415
416 return nsockfd;
417}
418
419static struct addrinfo *do_getaddrinfo(char *host, int ai_family)
420{
421 struct addrinfo hints, *ai_head;
422 int rc;
423
424 memset(&hints, 0, sizeof(hints));
425 hints.ai_family = ai_family;
426 hints.ai_socktype = SOCK_STREAM;
427 hints.ai_flags = AI_PASSIVE;
428
429 rc = getaddrinfo(host, usbip_port_string, &hints, &ai_head);
430 if (rc) {
431 err("failed to get a network address %s: %s", usbip_port_string,
432 gai_strerror(rc));
433 return NULL;
434 }
435
436 return ai_head;
437}
438
439static void signal_handler(int i)
440{
441 dbg("received '%s' signal", strsignal(i));
442}
443
444static void set_signal(void)
445{
446 struct sigaction act;
447
448 memset(&act, 0, sizeof(act));
449 act.sa_handler = signal_handler;
450 sigemptyset(&act.sa_mask);
451 sigaction(SIGTERM, &act, NULL);
452 sigaction(SIGINT, &act, NULL);
453 act.sa_handler = SIG_IGN;
454 sigaction(SIGCLD, &act, NULL);
455}
456
457static const char *pid_file;
458
459static void write_pid_file(void)
460{
461 if (pid_file) {
462 dbg("creating pid file %s", pid_file);
463 FILE *fp;
464
465 fp = fopen(pid_file, "w");
466 if (!fp) {
467 err("pid_file: %s: %d (%s)",
468 pid_file, errno, strerror(errno));
469 return;
470 }
471 fprintf(fp, "%d\n", getpid());
472 fclose(fp);
473 }
474}
475
476static void remove_pid_file(void)
477{
478 if (pid_file) {
479 dbg("removing pid file %s", pid_file);
480 unlink(pid_file);
481 }
482}
483
484static int do_standalone_mode(int daemonize, int ipv4, int ipv6)
485{
486 struct addrinfo *ai_head;
487 int sockfdlist[MAXSOCKFD];
488 int nsockfd, family;
489 int i, terminate;
490 struct pollfd *fds;
491 struct timespec timeout;
492 sigset_t sigmask;
493
494 if (usbip_host_driver_open()) {
495 err("please load " USBIP_CORE_MOD_NAME ".ko and "
496 USBIP_HOST_DRV_NAME ".ko!");
497 return -1;
498 }
499
500 if (daemonize) {
501 if (daemon(0, 0) < 0) {
502 err("daemonizing failed: %s", strerror(errno));
503 usbip_host_driver_close();
504 return -1;
505 }
506 umask(0);
507 usbip_use_syslog = 1;
508 }
509 set_signal();
510 write_pid_file();
511
512 info("starting " PROGNAME " (%s)", usbip_version_string);
513
514
515
516
517
518
519 if (ipv4 && ipv6)
520 family = AF_UNSPEC;
521 else if (ipv4)
522 family = AF_INET;
523 else
524 family = AF_INET6;
525
526 ai_head = do_getaddrinfo(NULL, family);
527 if (!ai_head) {
528 usbip_host_driver_close();
529 return -1;
530 }
531 nsockfd = listen_all_addrinfo(ai_head, sockfdlist,
532 sizeof(sockfdlist) / sizeof(*sockfdlist));
533 freeaddrinfo(ai_head);
534 if (nsockfd <= 0) {
535 err("failed to open a listening socket");
536 usbip_host_driver_close();
537 return -1;
538 }
539
540 dbg("listening on %d address%s", nsockfd, (nsockfd == 1) ? "" : "es");
541
542 fds = calloc(nsockfd, sizeof(struct pollfd));
543 for (i = 0; i < nsockfd; i++) {
544 fds[i].fd = sockfdlist[i];
545 fds[i].events = POLLIN;
546 }
547 timeout.tv_sec = MAIN_LOOP_TIMEOUT;
548 timeout.tv_nsec = 0;
549
550 sigfillset(&sigmask);
551 sigdelset(&sigmask, SIGTERM);
552 sigdelset(&sigmask, SIGINT);
553
554 terminate = 0;
555 while (!terminate) {
556 int r;
557
558 r = ppoll(fds, nsockfd, &timeout, &sigmask);
559 if (r < 0) {
560 dbg("%s", strerror(errno));
561 terminate = 1;
562 } else if (r) {
563 for (i = 0; i < nsockfd; i++) {
564 if (fds[i].revents & POLLIN) {
565 dbg("read event on fd[%d]=%d",
566 i, sockfdlist[i]);
567 process_request(sockfdlist[i]);
568 }
569 }
570 } else {
571 dbg("heartbeat timeout on ppoll()");
572 }
573 }
574
575 info("shutting down " PROGNAME);
576 free(fds);
577 usbip_host_driver_close();
578
579 return 0;
580}
581
582int main(int argc, char *argv[])
583{
584 static const struct option longopts[] = {
585 { "ipv4", no_argument, NULL, '4' },
586 { "ipv6", no_argument, NULL, '6' },
587 { "daemon", no_argument, NULL, 'D' },
588 { "daemon", no_argument, NULL, 'D' },
589 { "debug", no_argument, NULL, 'd' },
590 { "pid", optional_argument, NULL, 'P' },
591 { "tcp-port", required_argument, NULL, 't' },
592 { "help", no_argument, NULL, 'h' },
593 { "version", no_argument, NULL, 'v' },
594 { NULL, 0, NULL, 0 }
595 };
596
597 enum {
598 cmd_standalone_mode = 1,
599 cmd_help,
600 cmd_version
601 } cmd;
602
603 int daemonize = 0;
604 int ipv4 = 0, ipv6 = 0;
605 int opt, rc = -1;
606
607 pid_file = NULL;
608
609 usbip_use_stderr = 1;
610 usbip_use_syslog = 0;
611
612 if (geteuid() != 0)
613 err("not running as root?");
614
615 cmd = cmd_standalone_mode;
616 for (;;) {
617 opt = getopt_long(argc, argv, "46DdP::t:hv", longopts, NULL);
618
619 if (opt == -1)
620 break;
621
622 switch (opt) {
623 case '4':
624 ipv4 = 1;
625 break;
626 case '6':
627 ipv6 = 1;
628 break;
629 case 'D':
630 daemonize = 1;
631 break;
632 case 'd':
633 usbip_use_debug = 1;
634 break;
635 case 'h':
636 cmd = cmd_help;
637 break;
638 case 'P':
639 pid_file = optarg ? optarg : DEFAULT_PID_FILE;
640 break;
641 case 't':
642 usbip_setup_port_number(optarg);
643 break;
644 case 'v':
645 cmd = cmd_version;
646 break;
647 case '?':
648 usbipd_help();
649 default:
650 goto err_out;
651 }
652 }
653
654 if (!ipv4 && !ipv6)
655 ipv4 = ipv6 = 1;
656
657 switch (cmd) {
658 case cmd_standalone_mode:
659 rc = do_standalone_mode(daemonize, ipv4, ipv6);
660 remove_pid_file();
661 break;
662 case cmd_version:
663 printf(PROGNAME " (%s)\n", usbip_version_string);
664 rc = 0;
665 break;
666 case cmd_help:
667 usbipd_help();
668 rc = 0;
669 break;
670 default:
671 usbipd_help();
672 goto err_out;
673 }
674
675err_out:
676 return (rc > -1 ? EXIT_SUCCESS : EXIT_FAILURE);
677}
678
