1 /* 2 * Copyright (C) 2011 matt mooney <mfm@muteddisk.com> 3 * 2005-2007 Takahiro Hirofuchi 4 * Copyright (C) 2015-2016 Samsung Electronics 5 * Igor Kotrasinski <i.kotrasinsk@samsung.com> 6 * Krzysztof Opasiak <k.opasiak@samsung.com> 7 * 8 * This program is free software: you can redistribute it and/or modify 9 * it under the terms of the GNU General Public License as published by 10 * the Free Software Foundation, either version 2 of the License, or 11 * (at your option) any later version. 12 * 13 * This program is distributed in the hope that it will be useful, 14 * but WITHOUT ANY WARRANTY; without even the implied warranty of 15 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 16 * GNU General Public License for more details. 17 * 18 * You should have received a copy of the GNU General Public License 19 * along with this program. If not, see <http://www.gnu.org/licenses/>. 20 */ 21 22 #ifdef HAVE_CONFIG_H 23 #include "../config.h" 24 #endif 25 26 #define _GNU_SOURCE 27 #include <errno.h> 28 #include <unistd.h> 29 #include <netdb.h> 30 #include <string.h> 31 #include <stdlib.h> 32 #include <sys/types.h> 33 #include <sys/stat.h> 34 #include <arpa/inet.h> 35 #include <sys/socket.h> 36 #include <netinet/in.h> 37 38 #ifdef HAVE_LIBWRAP 39 #include <tcpd.h> 40 #endif 41 42 #include <getopt.h> 43 #include <signal.h> 44 #include <poll.h> 45 46 #include "usbip_host_driver.h" 47 #include "usbip_host_common.h" 48 #include "usbip_device_driver.h" 49 #include "usbip_common.h" 50 #include "usbip_network.h" 51 #include "list.h" 52 53 #undef PROGNAME 54 #define PROGNAME "usbipd" 55 #define MAXSOCKFD 20 56 57 #define MAIN_LOOP_TIMEOUT 10 58 59 #define DEFAULT_PID_FILE "/var/run/" PROGNAME ".pid" 60 61 static const char usbip_version_string[] = PACKAGE_STRING; 62 63 static const char usbipd_help_string[] = 64 "usage: usbipd [options]\n" 65 "\n" 66 " -4, --ipv4\n" 67 " Bind to IPv4. Default is both.\n" 68 "\n" 69 " -6, --ipv6\n" 70 " Bind to IPv6. Default is both.\n" 71 "\n" 72 " -e, --device\n" 73 " Run in device mode.\n" 74 " Rather than drive an attached device, create\n" 75 " a virtual UDC to bind gadgets to.\n" 76 "\n" 77 " -D, --daemon\n" 78 " Run as a daemon process.\n" 79 "\n" 80 " -d, --debug\n" 81 " Print debugging information.\n" 82 "\n" 83 " -PFILE, --pid FILE\n" 84 " Write process id to FILE.\n" 85 " If no FILE specified, use " DEFAULT_PID_FILE "\n" 86 "\n" 87 " -tPORT, --tcp-port PORT\n" 88 " Listen on TCP/IP port PORT.\n" 89 "\n" 90 " -h, --help\n" 91 " Print this help.\n" 92 "\n" 93 " -v, --version\n" 94 " Show version.\n"; 95 96 static struct usbip_host_driver *driver; 97 98 static void usbipd_help(void) 99 { 100 printf("%s\n", usbipd_help_string); 101 } 102 103 static int recv_request_import(int sockfd) 104 { 105 struct op_import_request req; 106 struct usbip_exported_device *edev; 107 struct usbip_usb_device pdu_udev; 108 struct list_head *i; 109 int found = 0; 110 int error = 0; 111 int rc; 112 113 memset(&req, 0, sizeof(req)); 114 115 rc = usbip_net_recv(sockfd, &req, sizeof(req)); 116 if (rc < 0) { 117 dbg("usbip_net_recv failed: import request"); 118 return -1; 119 } 120 PACK_OP_IMPORT_REQUEST(0, &req); 121 122 list_for_each(i, &driver->edev_list) { 123 edev = list_entry(i, struct usbip_exported_device, node); 124 if (!strncmp(req.busid, edev->udev.busid, SYSFS_BUS_ID_SIZE)) { 125 info("found requested device: %s", req.busid); 126 found = 1; 127 break; 128 } 129 } 130 131 if (found) { 132 /* should set TCP_NODELAY for usbip */ 133 usbip_net_set_nodelay(sockfd); 134 135 /* export device needs a TCP/IP socket descriptor */ 136 rc = usbip_export_device(edev, sockfd); 137 if (rc < 0) 138 error = 1; 139 } else { 140 info("requested device not found: %s", req.busid); 141 error = 1; 142 } 143 144 rc = usbip_net_send_op_common(sockfd, OP_REP_IMPORT, 145 (!error ? ST_OK : ST_NA)); 146 if (rc < 0) { 147 dbg("usbip_net_send_op_common failed: %#0x", OP_REP_IMPORT); 148 return -1; 149 } 150 151 if (error) { 152 dbg("import request busid %s: failed", req.busid); 153 return -1; 154 } 155 156 memcpy(&pdu_udev, &edev->udev, sizeof(pdu_udev)); 157 usbip_net_pack_usb_device(1, &pdu_udev); 158 159 rc = usbip_net_send(sockfd, &pdu_udev, sizeof(pdu_udev)); 160 if (rc < 0) { 161 dbg("usbip_net_send failed: devinfo"); 162 return -1; 163 } 164 165 dbg("import request busid %s: complete", req.busid); 166 167 return 0; 168 } 169 170 static int send_reply_devlist(int connfd) 171 { 172 struct usbip_exported_device *edev; 173 struct usbip_usb_device pdu_udev; 174 struct usbip_usb_interface pdu_uinf; 175 struct op_devlist_reply reply; 176 struct list_head *j; 177 int rc, i; 178 179 reply.ndev = 0; 180 /* number of exported devices */ 181 list_for_each(j, &driver->edev_list) { 182 reply.ndev += 1; 183 } 184 info("exportable devices: %d", reply.ndev); 185 186 rc = usbip_net_send_op_common(connfd, OP_REP_DEVLIST, ST_OK); 187 if (rc < 0) { 188 dbg("usbip_net_send_op_common failed: %#0x", OP_REP_DEVLIST); 189 return -1; 190 } 191 PACK_OP_DEVLIST_REPLY(1, &reply); 192 193 rc = usbip_net_send(connfd, &reply, sizeof(reply)); 194 if (rc < 0) { 195 dbg("usbip_net_send failed: %#0x", OP_REP_DEVLIST); 196 return -1; 197 } 198 199 list_for_each(j, &driver->edev_list) { 200 edev = list_entry(j, struct usbip_exported_device, node); 201 dump_usb_device(&edev->udev); 202 memcpy(&pdu_udev, &edev->udev, sizeof(pdu_udev)); 203 usbip_net_pack_usb_device(1, &pdu_udev); 204 205 rc = usbip_net_send(connfd, &pdu_udev, sizeof(pdu_udev)); 206 if (rc < 0) { 207 dbg("usbip_net_send failed: pdu_udev"); 208 return -1; 209 } 210 211 for (i = 0; i < edev->udev.bNumInterfaces; i++) { 212 dump_usb_interface(&edev->uinf[i]); 213 memcpy(&pdu_uinf, &edev->uinf[i], sizeof(pdu_uinf)); 214 usbip_net_pack_usb_interface(1, &pdu_uinf); 215 216 rc = usbip_net_send(connfd, &pdu_uinf, 217 sizeof(pdu_uinf)); 218 if (rc < 0) { 219 err("usbip_net_send failed: pdu_uinf"); 220 return -1; 221 } 222 } 223 } 224 225 return 0; 226 } 227 228 static int recv_request_devlist(int connfd) 229 { 230 struct op_devlist_request req; 231 int rc; 232 233 memset(&req, 0, sizeof(req)); 234 235 rc = usbip_net_recv(connfd, &req, sizeof(req)); 236 if (rc < 0) { 237 dbg("usbip_net_recv failed: devlist request"); 238 return -1; 239 } 240 241 rc = send_reply_devlist(connfd); 242 if (rc < 0) { 243 dbg("send_reply_devlist failed"); 244 return -1; 245 } 246 247 return 0; 248 } 249 250 static int recv_pdu(int connfd) 251 { 252 uint16_t code = OP_UNSPEC; 253 int ret; 254 255 ret = usbip_net_recv_op_common(connfd, &code); 256 if (ret < 0) { 257 dbg("could not receive opcode: %#0x", code); 258 return -1; 259 } 260 261 ret = usbip_refresh_device_list(driver); 262 if (ret < 0) { 263 dbg("could not refresh device list: %d", ret); 264 return -1; 265 } 266 267 info("received request: %#0x(%d)", code, connfd); 268 switch (code) { 269 case OP_REQ_DEVLIST: 270 ret = recv_request_devlist(connfd); 271 break; 272 case OP_REQ_IMPORT: 273 ret = recv_request_import(connfd); 274 break; 275 case OP_REQ_DEVINFO: 276 case OP_REQ_CRYPKEY: 277 default: 278 err("received an unknown opcode: %#0x", code); 279 ret = -1; 280 } 281 282 if (ret == 0) 283 info("request %#0x(%d): complete", code, connfd); 284 else 285 info("request %#0x(%d): failed", code, connfd); 286 287 return ret; 288 } 289 290 #ifdef HAVE_LIBWRAP 291 static int tcpd_auth(int connfd) 292 { 293 struct request_info request; 294 int rc; 295 296 request_init(&request, RQ_DAEMON, PROGNAME, RQ_FILE, connfd, 0); 297 fromhost(&request); 298 rc = hosts_access(&request); 299 if (rc == 0) 300 return -1; 301 302 return 0; 303 } 304 #endif 305 306 static int do_accept(int listenfd) 307 { 308 int connfd; 309 struct sockaddr_storage ss; 310 socklen_t len = sizeof(ss); 311 char host[NI_MAXHOST], port[NI_MAXSERV]; 312 int rc; 313 314 memset(&ss, 0, sizeof(ss)); 315 316 connfd = accept(listenfd, (struct sockaddr *)&ss, &len); 317 if (connfd < 0) { 318 err("failed to accept connection"); 319 return -1; 320 } 321 322 rc = getnameinfo((struct sockaddr *)&ss, len, host, sizeof(host), 323 port, sizeof(port), NI_NUMERICHOST | NI_NUMERICSERV); 324 if (rc) 325 err("getnameinfo: %s", gai_strerror(rc)); 326 327 #ifdef HAVE_LIBWRAP 328 rc = tcpd_auth(connfd); 329 if (rc < 0) { 330 info("denied access from %s", host); 331 close(connfd); 332 return -1; 333 } 334 #endif 335 info("connection from %s:%s", host, port); 336 337 return connfd; 338 } 339 340 int process_request(int listenfd) 341 { 342 pid_t childpid; 343 int connfd; 344 345 connfd = do_accept(listenfd); 346 if (connfd < 0) 347 return -1; 348 childpid = fork(); 349 if (childpid == 0) { 350 close(listenfd); 351 recv_pdu(connfd); 352 exit(0); 353 } 354 close(connfd); 355 return 0; 356 } 357 358 static void addrinfo_to_text(struct addrinfo *ai, char buf[], 359 const size_t buf_size) 360 { 361 char hbuf[NI_MAXHOST]; 362 char sbuf[NI_MAXSERV]; 363 int rc; 364 365 buf[0] = '\0'; 366 367 rc = getnameinfo(ai->ai_addr, ai->ai_addrlen, hbuf, sizeof(hbuf), 368 sbuf, sizeof(sbuf), NI_NUMERICHOST | NI_NUMERICSERV); 369 if (rc) 370 err("getnameinfo: %s", gai_strerror(rc)); 371 372 snprintf(buf, buf_size, "%s:%s", hbuf, sbuf); 373 } 374 375 static int listen_all_addrinfo(struct addrinfo *ai_head, int sockfdlist[], 376 int maxsockfd) 377 { 378 struct addrinfo *ai; 379 int ret, nsockfd = 0; 380 const size_t ai_buf_size = NI_MAXHOST + NI_MAXSERV + 2; 381 char ai_buf[ai_buf_size]; 382 383 for (ai = ai_head; ai && nsockfd < maxsockfd; ai = ai->ai_next) { 384 int sock; 385 386 addrinfo_to_text(ai, ai_buf, ai_buf_size); 387 dbg("opening %s", ai_buf); 388 sock = socket(ai->ai_family, ai->ai_socktype, ai->ai_protocol); 389 if (sock < 0) { 390 err("socket: %s: %d (%s)", 391 ai_buf, errno, strerror(errno)); 392 continue; 393 } 394 395 usbip_net_set_reuseaddr(sock); 396 usbip_net_set_nodelay(sock); 397 /* We use seperate sockets for IPv4 and IPv6 398 * (see do_standalone_mode()) */ 399 usbip_net_set_v6only(sock); 400 401 ret = bind(sock, ai->ai_addr, ai->ai_addrlen); 402 if (ret < 0) { 403 err("bind: %s: %d (%s)", 404 ai_buf, errno, strerror(errno)); 405 close(sock); 406 continue; 407 } 408 409 ret = listen(sock, SOMAXCONN); 410 if (ret < 0) { 411 err("listen: %s: %d (%s)", 412 ai_buf, errno, strerror(errno)); 413 close(sock); 414 continue; 415 } 416 417 info("listening on %s", ai_buf); 418 sockfdlist[nsockfd++] = sock; 419 } 420 421 return nsockfd; 422 } 423 424 static struct addrinfo *do_getaddrinfo(char *host, int ai_family) 425 { 426 struct addrinfo hints, *ai_head; 427 int rc; 428 429 memset(&hints, 0, sizeof(hints)); 430 hints.ai_family = ai_family; 431 hints.ai_socktype = SOCK_STREAM; 432 hints.ai_flags = AI_PASSIVE; 433 434 rc = getaddrinfo(host, usbip_port_string, &hints, &ai_head); 435 if (rc) { 436 err("failed to get a network address %s: %s", usbip_port_string, 437 gai_strerror(rc)); 438 return NULL; 439 } 440 441 return ai_head; 442 } 443 444 static void signal_handler(int i) 445 { 446 dbg("received '%s' signal", strsignal(i)); 447 } 448 449 static void set_signal(void) 450 { 451 struct sigaction act; 452 453 memset(&act, 0, sizeof(act)); 454 act.sa_handler = signal_handler; 455 sigemptyset(&act.sa_mask); 456 sigaction(SIGTERM, &act, NULL); 457 sigaction(SIGINT, &act, NULL); 458 act.sa_handler = SIG_IGN; 459 sigaction(SIGCLD, &act, NULL); 460 } 461 462 static const char *pid_file; 463 464 static void write_pid_file(void) 465 { 466 if (pid_file) { 467 dbg("creating pid file %s", pid_file); 468 FILE *fp; 469 470 fp = fopen(pid_file, "w"); 471 if (!fp) { 472 err("pid_file: %s: %d (%s)", 473 pid_file, errno, strerror(errno)); 474 return; 475 } 476 fprintf(fp, "%d\n", getpid()); 477 fclose(fp); 478 } 479 } 480 481 static void remove_pid_file(void) 482 { 483 if (pid_file) { 484 dbg("removing pid file %s", pid_file); 485 unlink(pid_file); 486 } 487 } 488 489 static int do_standalone_mode(int daemonize, int ipv4, int ipv6) 490 { 491 struct addrinfo *ai_head; 492 int sockfdlist[MAXSOCKFD]; 493 int nsockfd, family; 494 int i, terminate; 495 struct pollfd *fds; 496 struct timespec timeout; 497 sigset_t sigmask; 498 499 if (usbip_driver_open(driver)) 500 return -1; 501 502 if (daemonize) { 503 if (daemon(0, 0) < 0) { 504 err("daemonizing failed: %s", strerror(errno)); 505 usbip_driver_close(driver); 506 return -1; 507 } 508 umask(0); 509 usbip_use_syslog = 1; 510 } 511 set_signal(); 512 write_pid_file(); 513 514 info("starting " PROGNAME " (%s)", usbip_version_string); 515 516 /* 517 * To suppress warnings on systems with bindv6only disabled 518 * (default), we use seperate sockets for IPv6 and IPv4 and set 519 * IPV6_V6ONLY on the IPv6 sockets. 520 */ 521 if (ipv4 && ipv6) 522 family = AF_UNSPEC; 523 else if (ipv4) 524 family = AF_INET; 525 else 526 family = AF_INET6; 527 528 ai_head = do_getaddrinfo(NULL, family); 529 if (!ai_head) { 530 usbip_driver_close(driver); 531 return -1; 532 } 533 nsockfd = listen_all_addrinfo(ai_head, sockfdlist, 534 sizeof(sockfdlist) / sizeof(*sockfdlist)); 535 freeaddrinfo(ai_head); 536 if (nsockfd <= 0) { 537 err("failed to open a listening socket"); 538 usbip_driver_close(driver); 539 return -1; 540 } 541 542 dbg("listening on %d address%s", nsockfd, (nsockfd == 1) ? "" : "es"); 543 544 fds = calloc(nsockfd, sizeof(struct pollfd)); 545 for (i = 0; i < nsockfd; i++) { 546 fds[i].fd = sockfdlist[i]; 547 fds[i].events = POLLIN; 548 } 549 timeout.tv_sec = MAIN_LOOP_TIMEOUT; 550 timeout.tv_nsec = 0; 551 552 sigfillset(&sigmask); 553 sigdelset(&sigmask, SIGTERM); 554 sigdelset(&sigmask, SIGINT); 555 556 terminate = 0; 557 while (!terminate) { 558 int r; 559 560 r = ppoll(fds, nsockfd, &timeout, &sigmask); 561 if (r < 0) { 562 dbg("%s", strerror(errno)); 563 terminate = 1; 564 } else if (r) { 565 for (i = 0; i < nsockfd; i++) { 566 if (fds[i].revents & POLLIN) { 567 dbg("read event on fd[%d]=%d", 568 i, sockfdlist[i]); 569 process_request(sockfdlist[i]); 570 } 571 } 572 } else { 573 dbg("heartbeat timeout on ppoll()"); 574 } 575 } 576 577 info("shutting down " PROGNAME); 578 free(fds); 579 usbip_driver_close(driver); 580 581 return 0; 582 } 583 584 int main(int argc, char *argv[]) 585 { 586 static const struct option longopts[] = { 587 { "ipv4", no_argument, NULL, '4' }, 588 { "ipv6", no_argument, NULL, '6' }, 589 { "daemon", no_argument, NULL, 'D' }, 590 { "daemon", no_argument, NULL, 'D' }, 591 { "debug", no_argument, NULL, 'd' }, 592 { "device", no_argument, NULL, 'e' }, 593 { "pid", optional_argument, NULL, 'P' }, 594 { "tcp-port", required_argument, NULL, 't' }, 595 { "help", no_argument, NULL, 'h' }, 596 { "version", no_argument, NULL, 'v' }, 597 { NULL, 0, NULL, 0 } 598 }; 599 600 enum { 601 cmd_standalone_mode = 1, 602 cmd_help, 603 cmd_version 604 } cmd; 605 606 int daemonize = 0; 607 int ipv4 = 0, ipv6 = 0; 608 int opt, rc = -1; 609 610 pid_file = NULL; 611 612 usbip_use_stderr = 1; 613 usbip_use_syslog = 0; 614 615 if (geteuid() != 0) 616 err("not running as root?"); 617 618 cmd = cmd_standalone_mode; 619 driver = &host_driver; 620 for (;;) { 621 opt = getopt_long(argc, argv, "46DdeP::t:hv", longopts, NULL); 622 623 if (opt == -1) 624 break; 625 626 switch (opt) { 627 case '4': 628 ipv4 = 1; 629 break; 630 case '6': 631 ipv6 = 1; 632 break; 633 case 'D': 634 daemonize = 1; 635 break; 636 case 'd': 637 usbip_use_debug = 1; 638 break; 639 case 'h': 640 cmd = cmd_help; 641 break; 642 case 'P': 643 pid_file = optarg ? optarg : DEFAULT_PID_FILE; 644 break; 645 case 't': 646 usbip_setup_port_number(optarg); 647 break; 648 case 'v': 649 cmd = cmd_version; 650 break; 651 case 'e': 652 driver = &device_driver; 653 break; 654 case '?': 655 usbipd_help(); 656 default: 657 goto err_out; 658 } 659 } 660 661 if (!ipv4 && !ipv6) 662 ipv4 = ipv6 = 1; 663 664 switch (cmd) { 665 case cmd_standalone_mode: 666 rc = do_standalone_mode(daemonize, ipv4, ipv6); 667 remove_pid_file(); 668 break; 669 case cmd_version: 670 printf(PROGNAME " (%s)\n", usbip_version_string); 671 rc = 0; 672 break; 673 case cmd_help: 674 usbipd_help(); 675 rc = 0; 676 break; 677 default: 678 usbipd_help(); 679 goto err_out; 680 } 681 682 err_out: 683 return (rc > -1 ? EXIT_SUCCESS : EXIT_FAILURE); 684 } 685