Kévin Redon | 6e3f112 | 2018-07-01 18:24:42 +0200 | [diff] [blame^] | 1 | /* simtrace2-sniff - main program for the host PC to communicate with the SIMtrace 2 firmware in sniffer mode */ |
| 2 | /* This program is free software; you can redistribute it and/or |
| 3 | * modify it under the terms of the GNU General Public License |
| 4 | * as published by the Free Software Foundation; either version 2 |
| 5 | * of the License, or (at your option) any later version. |
| 6 | * |
| 7 | * This program is distributed in the hope that it will be useful, |
| 8 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 9 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 10 | * GNU General Public License for more details. |
| 11 | * |
| 12 | * You should have received a copy of the GNU General Public License |
| 13 | * along with this program; if not, write to the Free Software |
| 14 | * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA. |
| 15 | * |
| 16 | * (C) 2010-2017 by Harald Welte <hwelte@hmw-consulting.de> |
| 17 | * (C) 2018 by Kevin Redon <kredon@sysmocom.de> |
| 18 | */ |
| 19 | #include <errno.h> |
| 20 | #include <unistd.h> |
| 21 | #include <stdio.h> |
| 22 | #include <stdlib.h> |
| 23 | #include <string.h> |
| 24 | #include <stdint.h> |
| 25 | #include <signal.h> |
| 26 | #include <time.h> |
| 27 | #define _GNU_SOURCE |
| 28 | #include <getopt.h> |
| 29 | |
| 30 | #include <sys/time.h> |
| 31 | #include <sys/types.h> |
| 32 | #include <sys/socket.h> |
| 33 | #include <netinet/in.h> |
| 34 | #include <arpa/inet.h> |
| 35 | |
| 36 | #include <libusb.h> |
| 37 | |
| 38 | #include "libusb_util.h" |
| 39 | #include "simtrace.h" |
| 40 | #include "simtrace_usb.h" |
| 41 | #include "simtrace_prot.h" |
| 42 | #include "simtrace2-discovery.h" |
| 43 | |
| 44 | #include <osmocom/core/gsmtap.h> |
| 45 | #include <osmocom/core/gsmtap_util.h> |
| 46 | #include <osmocom/core/utils.h> |
| 47 | #include <osmocom/core/socket.h> |
| 48 | #include <osmocom/core/msgb.h> |
| 49 | #include <osmocom/sim/class_tables.h> |
| 50 | #include <osmocom/sim/sim.h> |
| 51 | |
| 52 | /* transport to a SIMtrace device */ |
| 53 | struct st_transport { |
| 54 | /* USB */ |
| 55 | struct libusb_device_handle *usb_devh; |
| 56 | struct { |
| 57 | uint8_t in; |
| 58 | uint8_t out; |
| 59 | uint8_t irq_in; |
| 60 | } usb_ep; |
| 61 | }; |
| 62 | |
| 63 | /* global GSMTAP instance */ |
| 64 | static struct gsmtap_inst *g_gti; |
| 65 | |
| 66 | static int gsmtap_send_sim(const uint8_t *apdu, unsigned int len) |
| 67 | { |
| 68 | struct gsmtap_hdr *gh; |
| 69 | unsigned int gross_len = len + sizeof(*gh); |
| 70 | uint8_t *buf = malloc(gross_len); |
| 71 | int rc; |
| 72 | |
| 73 | if (!buf) |
| 74 | return -ENOMEM; |
| 75 | |
| 76 | memset(buf, 0, sizeof(*gh)); |
| 77 | gh = (struct gsmtap_hdr *) buf; |
| 78 | gh->version = GSMTAP_VERSION; |
| 79 | gh->hdr_len = sizeof(*gh)/4; |
| 80 | gh->type = GSMTAP_TYPE_SIM; |
| 81 | |
| 82 | memcpy(buf + sizeof(*gh), apdu, len); |
| 83 | |
| 84 | rc = write(gsmtap_inst_fd(g_gti), buf, gross_len); |
| 85 | if (rc < 0) { |
| 86 | perror("write gsmtap"); |
| 87 | free(buf); |
| 88 | return rc; |
| 89 | } |
| 90 | |
| 91 | free(buf); |
| 92 | return 0; |
| 93 | } |
| 94 | |
| 95 | static int process_change(uint8_t *buf, int len) |
| 96 | { |
| 97 | /* check if there is enough data for the structure */ |
| 98 | if (len<sizeof(struct sniff_change)) { |
| 99 | return -1; |
| 100 | } |
| 101 | struct sniff_change *change = (struct sniff_change *)buf; |
| 102 | |
| 103 | if (SNIFF_CHANGE_FLAG_TIMEOUT_WT!=change->flags) { |
| 104 | printf("Card state change: "); |
| 105 | } |
| 106 | if (change->flags&SNIFF_CHANGE_FLAG_CARD_INSERT) { |
| 107 | printf("card inserted "); |
| 108 | } |
| 109 | if (change->flags&SNIFF_CHANGE_FLAG_CARD_EJECT) { |
| 110 | printf("card ejected "); |
| 111 | } |
| 112 | if (change->flags&SNIFF_CHANGE_FLAG_RESET_HOLD) { |
| 113 | printf("reset hold "); |
| 114 | } |
| 115 | if (change->flags&SNIFF_CHANGE_FLAG_RESET_RELEASE) { |
| 116 | printf("reset release "); |
| 117 | } |
| 118 | if (change->flags&SNIFF_CHANGE_FLAG_TIMEOUT_WT) { |
| 119 | // do nothing since this also triggers on inactivity |
| 120 | } |
| 121 | if (SNIFF_CHANGE_FLAG_TIMEOUT_WT!=change->flags) { |
| 122 | printf("\n"); |
| 123 | } |
| 124 | |
| 125 | return 0; |
| 126 | } |
| 127 | |
| 128 | /* Table 7 of ISO 7816-3:2006 */ |
| 129 | static const uint16_t fi_table[] = { 372, 372, 558, 744, 1116, 1488, 1860, 0, 0, 512, 768, 1024, 1536, 2048, 0, 0, }; |
| 130 | |
| 131 | /* Table 8 from ISO 7816-3:2006 */ |
| 132 | static const uint8_t di_table[] = { 0, 1, 2, 4, 8, 16, 32, 64, 12, 20, 2, 4, 8, 16, 32, 64, }; |
| 133 | |
| 134 | static int process_fidi(uint8_t *buf, int len) |
| 135 | { |
| 136 | /* check if there is enough data for the structure */ |
| 137 | if (len<sizeof(struct sniff_fidi)) { |
| 138 | return -1; |
| 139 | } |
| 140 | struct sniff_fidi *fidi = (struct sniff_fidi *)buf; |
| 141 | |
| 142 | printf("Fi/Di switched to %u/%u\n", fi_table[fidi->fidi>>4], di_table[fidi->fidi&0x0f]); |
| 143 | return 0; |
| 144 | } |
| 145 | |
| 146 | static int process_atr(uint8_t *buf, int len) |
| 147 | { |
| 148 | /* check if there is enough data for the structure */ |
| 149 | if (len<sizeof(struct sniff_data)) { |
| 150 | return -1; |
| 151 | } |
| 152 | struct sniff_data *atr = (struct sniff_data *)buf; |
| 153 | |
| 154 | /* check if the data is available */ |
| 155 | if (len<sizeof(struct sniff_data)+atr->length) { |
| 156 | return -2; |
| 157 | } |
| 158 | |
| 159 | printf("ATR%s: ", atr->complete ? "" : " (incomplete)"); |
| 160 | uint16_t i; |
| 161 | for (i = 0; i < atr->length; i++) { |
| 162 | printf("%02x ", atr->data[i]); |
| 163 | } |
| 164 | printf("\n"); |
| 165 | return 0; |
| 166 | } |
| 167 | |
| 168 | static int process_pps(uint8_t *buf, int len) |
| 169 | { |
| 170 | /* check if there is enough data for the structure */ |
| 171 | if (len<sizeof(struct sniff_data)) { |
| 172 | return -1; |
| 173 | } |
| 174 | struct sniff_data *pps = (struct sniff_data *)buf; |
| 175 | |
| 176 | /* check if the data is available */ |
| 177 | if (len<sizeof(struct sniff_data)+pps->length) { |
| 178 | return -2; |
| 179 | } |
| 180 | |
| 181 | printf("PPS%s: ", pps->complete ? "" : " (incomplete) "); |
| 182 | uint16_t i; |
| 183 | for (i = 0; i < pps->length; i++) { |
| 184 | printf("%02x ", pps->data[i]); |
| 185 | } |
| 186 | printf("\n"); |
| 187 | return 0; |
| 188 | } |
| 189 | |
| 190 | static int process_tpdu(uint8_t *buf, int len) |
| 191 | { |
| 192 | /* check if there is enough data for the structure */ |
| 193 | if (len<sizeof(struct sniff_data)) { |
| 194 | return -1; |
| 195 | } |
| 196 | struct sniff_data *tpdu = (struct sniff_data *)buf; |
| 197 | |
| 198 | /* check if the data is available */ |
| 199 | if (len<sizeof(struct sniff_data)+tpdu->length) { |
| 200 | return -2; |
| 201 | } |
| 202 | |
| 203 | printf("TPDU%s: ", tpdu->complete ? "" : " (incomplete)"); |
| 204 | uint16_t i; |
| 205 | for (i = 0; i < tpdu->length; i++) { |
| 206 | printf("%02x ", tpdu->data[i]); |
| 207 | } |
| 208 | printf("\n"); |
| 209 | return 0; |
| 210 | } |
| 211 | |
| 212 | /*! \brief Process an incoming message from the SIMtrace2 */ |
| 213 | static int process_usb_msg(uint8_t *buf, int len) |
| 214 | { |
| 215 | /* check if enough data for the header is present */ |
| 216 | if (len<sizeof(struct simtrace_msg_hdr)) { |
| 217 | return 0; |
| 218 | } |
| 219 | |
| 220 | /* check if message is complete */ |
| 221 | struct simtrace_msg_hdr *msg_hdr = (struct simtrace_msg_hdr *)buf; |
| 222 | if (len<msg_hdr->msg_len) { |
| 223 | return 0; |
| 224 | } |
| 225 | //printf("msg: %s\n", osmo_hexdump(buf, msg_hdr->msg_len)); |
| 226 | |
| 227 | /* check for message class */ |
| 228 | if (SIMTRACE_MSGC_SNIFF!=msg_hdr->msg_class) { /* we only care about sniffing messages */ |
| 229 | return msg_hdr->msg_len; /* discard non-sniffing messaged */ |
| 230 | } |
| 231 | |
| 232 | /* process sniff message payload */ |
| 233 | buf += sizeof(struct simtrace_msg_hdr); |
| 234 | len -= sizeof(struct simtrace_msg_hdr); |
| 235 | switch (msg_hdr->msg_type) { |
| 236 | case SIMTRACE_MSGT_SNIFF_CHANGE: |
| 237 | process_change(buf, len); |
| 238 | break; |
| 239 | case SIMTRACE_MSGT_SNIFF_FIDI: |
| 240 | process_fidi(buf, len); |
| 241 | break; |
| 242 | case SIMTRACE_MSGT_SNIFF_ATR: |
| 243 | process_atr(buf, len); |
| 244 | break; |
| 245 | case SIMTRACE_MSGT_SNIFF_PPS: |
| 246 | process_pps(buf, len); |
| 247 | break; |
| 248 | case SIMTRACE_MSGT_SNIFF_TPDU: |
| 249 | process_tpdu(buf, len); |
| 250 | break; |
| 251 | default: |
| 252 | printf("unknown SIMtrace msg type 0x%02x\n", msg_hdr->msg_type); |
| 253 | break; |
| 254 | } |
| 255 | |
| 256 | return msg_hdr->msg_len; |
| 257 | } |
| 258 | |
| 259 | /*! Transport to SIMtrace device (e.g. USB handle) */ |
| 260 | static struct st_transport _transp; |
| 261 | |
| 262 | static void run_mainloop() |
| 263 | { |
| 264 | int rc; |
| 265 | uint8_t buf[16*256]; |
| 266 | unsigned int i, buf_i = 0; |
| 267 | int xfer_len; |
| 268 | |
| 269 | printf("Entering main loop\n"); |
| 270 | |
| 271 | while (true) { |
| 272 | /* read data from SIMtrace2 device (via USB) */ |
| 273 | rc = libusb_bulk_transfer(_transp.usb_devh, _transp.usb_ep.in, |
| 274 | &buf[buf_i], sizeof(buf)-buf_i, &xfer_len, 100000); |
| 275 | if (rc < 0 && rc != LIBUSB_ERROR_TIMEOUT && |
| 276 | rc != LIBUSB_ERROR_INTERRUPTED && |
| 277 | rc != LIBUSB_ERROR_IO) { |
| 278 | fprintf(stderr, "BULK IN transfer error; rc=%d\n", rc); |
| 279 | return; |
| 280 | } |
| 281 | /* dispatch any incoming data */ |
| 282 | if (xfer_len > 0) { |
| 283 | //printf("URB: %s\n", osmo_hexdump(&buf[buf_i], xfer_len)); |
| 284 | buf_i += xfer_len; |
| 285 | if (buf_i>=sizeof(buf)) { |
| 286 | perror("preventing USB buffer overflow"); |
| 287 | return; |
| 288 | } |
| 289 | int processed = process_usb_msg(buf, buf_i); |
| 290 | if (processed > 0 && processed <= buf_i) { |
| 291 | for (i = processed; i < buf_i; i++) { |
| 292 | buf[i-processed] = buf[i]; |
| 293 | } |
| 294 | buf_i -= processed; |
| 295 | } |
| 296 | } |
| 297 | } |
| 298 | } |
| 299 | |
| 300 | static void print_welcome(void) |
| 301 | { |
| 302 | printf("simtrace2-sniff - Phone-SIM card communication sniffer \n" |
| 303 | "(C) 2010-2017 by Harald Welte <laforge@gnumonks.org>\n" |
| 304 | "(C) 2018 by Kevin Redon <kredon@sysmocom.de>\n" |
| 305 | "\n" |
| 306 | ); |
| 307 | } |
| 308 | |
| 309 | static void print_help(void) |
| 310 | { |
| 311 | printf( |
| 312 | "\t-h\t--help\n" |
| 313 | "\t-i\t--gsmtap-ip\tA.B.C.D\n" |
| 314 | "\t-k\t--keep-running\n" |
| 315 | "\t-V\t--usb-vendor\tVENDOR_ID\n" |
| 316 | "\t-P\t--usb-product\tPRODUCT_ID\n" |
| 317 | "\t-C\t--usb-config\tCONFIG_ID\n" |
| 318 | "\t-I\t--usb-interface\tINTERFACE_ID\n" |
| 319 | "\t-S\t--usb-altsetting ALTSETTING_ID\n" |
| 320 | "\t-A\t--usb-address\tADDRESS\n" |
| 321 | "\n" |
| 322 | ); |
| 323 | } |
| 324 | |
| 325 | static const struct option opts[] = { |
| 326 | { "help", 0, 0, 'h' }, |
| 327 | { "gsmtap-ip", 1, 0, 'i' }, |
| 328 | { "keep-running", 0, 0, 'k' }, |
| 329 | { "usb-vendor", 1, 0, 'V' }, |
| 330 | { "usb-product", 1, 0, 'P' }, |
| 331 | { "usb-config", 1, 0, 'C' }, |
| 332 | { "usb-interface", 1, 0, 'I' }, |
| 333 | { "usb-altsetting", 1, 0, 'S' }, |
| 334 | { "usb-address", 1, 0, 'A' }, |
| 335 | { NULL, 0, 0, 0 } |
| 336 | }; |
| 337 | |
| 338 | /* Known USB device with SIMtrace firmware supporting sniffer */ |
| 339 | static const struct dev_id compatible_dev_ids[] = { |
| 340 | { USB_VENDOR_OPENMOKO, USB_PRODUCT_SIMTRACE2 }, |
| 341 | { 0, 0 } |
| 342 | }; |
| 343 | |
| 344 | static void signal_handler(int signal) |
| 345 | { |
| 346 | switch (signal) { |
| 347 | case SIGINT: |
| 348 | exit(0); |
| 349 | break; |
| 350 | default: |
| 351 | break; |
| 352 | } |
| 353 | } |
| 354 | |
| 355 | int main(int argc, char **argv) |
| 356 | { |
| 357 | int i, rc, ret; |
| 358 | print_welcome(); |
| 359 | |
| 360 | /* Parse arguments */ |
| 361 | char *gsmtap_host = "127.0.0.1"; |
| 362 | int keep_running = 0; |
| 363 | int vendor_id = -1, product_id = -1, addr = -1, config_id = -1, if_num = -1, altsetting = -1; |
| 364 | |
| 365 | while (1) { |
| 366 | int option_index = 0; |
| 367 | |
| 368 | char c = getopt_long(argc, argv, "hi:kV:P:C:I:S:A:", opts, &option_index); |
| 369 | if (c == -1) |
| 370 | break; |
| 371 | switch (c) { |
| 372 | case 'h': |
| 373 | print_help(); |
| 374 | exit(0); |
| 375 | break; |
| 376 | case 'i': |
| 377 | gsmtap_host = optarg; |
| 378 | break; |
| 379 | case 'k': |
| 380 | keep_running = 1; |
| 381 | break; |
| 382 | case 'V': |
| 383 | vendor_id = strtol(optarg, NULL, 16); |
| 384 | break; |
| 385 | case 'P': |
| 386 | product_id = strtol(optarg, NULL, 16); |
| 387 | break; |
| 388 | case 'C': |
| 389 | config_id = atoi(optarg); |
| 390 | break; |
| 391 | case 'I': |
| 392 | if_num = atoi(optarg); |
| 393 | break; |
| 394 | case 'S': |
| 395 | altsetting = atoi(optarg); |
| 396 | break; |
| 397 | case 'A': |
| 398 | addr = atoi(optarg); |
| 399 | break; |
| 400 | } |
| 401 | } |
| 402 | |
| 403 | /* Scan for available SIMtrace USB devices supporting sniffing */ |
| 404 | rc = libusb_init(NULL); |
| 405 | if (rc < 0) { |
| 406 | fprintf(stderr, "libusb initialization failed\n"); |
| 407 | goto do_exit; |
| 408 | } |
| 409 | struct usb_interface_match ifm_scan[16]; |
| 410 | int num_interfaces = usb_match_interfaces(NULL, compatible_dev_ids, |
| 411 | USB_CLASS_PROPRIETARY, SIMTRACE_SNIFFER_USB_SUBCLASS, -1, ifm_scan, ARRAY_SIZE(ifm_scan)); |
| 412 | if (num_interfaces <= 0) { |
| 413 | perror("No compatible USB devices found"); |
| 414 | goto do_exit; |
| 415 | } |
| 416 | |
| 417 | /* Only keep USB matching arguments */ |
| 418 | struct usb_interface_match ifm_filtered[ARRAY_SIZE(ifm_scan)]; |
| 419 | int num_filtered = 0; |
| 420 | for (i = 0; i < num_interfaces; i++) { |
| 421 | if (vendor_id>=0 && vendor_id!=ifm_scan[i].vendor) { |
| 422 | continue; |
| 423 | } |
| 424 | if (product_id>=0 && product_id!=ifm_scan[i].product) { |
| 425 | continue; |
| 426 | } |
| 427 | if (config_id>=0 && config_id!=ifm_scan[i].configuration) { |
| 428 | continue; |
| 429 | } |
| 430 | if (if_num>=0 && if_num!=ifm_scan[i].interface) { |
| 431 | continue; |
| 432 | } |
| 433 | if (altsetting>=0 && altsetting!=ifm_scan[i].altsetting) { |
| 434 | continue; |
| 435 | } |
| 436 | if (addr>=0 && addr!=ifm_scan[i].addr) { |
| 437 | continue; |
| 438 | } |
| 439 | ifm_filtered[num_filtered++] = ifm_scan[i]; |
| 440 | } |
| 441 | if (1!=num_filtered) { |
| 442 | perror("No individual matching USB devices found"); |
| 443 | printf("Available USB devices:\n"); |
| 444 | for (i = 0; i < num_interfaces; i++) { |
| 445 | printf("\t%04x:%04x Addr=%u, Path=%s, Cfg=%u, Intf=%u, Alt=%u: %d/%d/%d ", |
| 446 | ifm_scan[i].vendor, ifm_scan[i].product, ifm_scan[i].addr, ifm_scan[i].path, |
| 447 | ifm_scan[i].configuration, ifm_scan[i].interface, ifm_scan[i].altsetting, |
| 448 | ifm_scan[i].class, ifm_scan[i].sub_class, ifm_scan[i].protocol); |
| 449 | libusb_device_handle *dev_handle; |
| 450 | rc = libusb_open(ifm_scan[i].usb_dev, &dev_handle); |
| 451 | if (rc < 0) { |
| 452 | printf("\n"); |
| 453 | perror("Cannot open device"); |
| 454 | continue; |
| 455 | } |
| 456 | char strbuf[256]; |
| 457 | rc = libusb_get_string_descriptor_ascii(dev_handle, ifm_scan[i].string_idx, |
| 458 | (unsigned char *)strbuf, sizeof(strbuf)); |
| 459 | libusb_close(dev_handle); |
| 460 | if (rc < 0) { |
| 461 | printf("\n"); |
| 462 | perror("Cannot read string"); |
| 463 | continue; |
| 464 | } |
| 465 | printf("(%s)\n", strbuf); |
| 466 | } |
| 467 | goto do_exit; |
| 468 | } |
| 469 | struct usb_interface_match ifm_selected = ifm_filtered[0]; |
| 470 | printf("Using USB device %04x:%04x Addr=%u, Path=%s, Cfg=%u, Intf=%u, Alt=%u: %d/%d/%d ", |
| 471 | ifm_selected.vendor, ifm_selected.product, ifm_selected.addr, ifm_selected.path, |
| 472 | ifm_selected.configuration, ifm_selected.interface, ifm_selected.altsetting, |
| 473 | ifm_selected.class, ifm_selected.sub_class, ifm_selected.protocol); |
| 474 | libusb_device_handle *dev_handle; |
| 475 | rc = libusb_open(ifm_selected.usb_dev, &dev_handle); |
| 476 | if (rc < 0) { |
| 477 | printf("\n"); |
| 478 | perror("Cannot open device"); |
| 479 | } |
| 480 | char strbuf[256]; |
| 481 | rc = libusb_get_string_descriptor_ascii(dev_handle, ifm_selected.string_idx, |
| 482 | (unsigned char *)strbuf, sizeof(strbuf)); |
| 483 | libusb_close(dev_handle); |
| 484 | if (rc < 0) { |
| 485 | printf("\n"); |
| 486 | perror("Cannot read string"); |
| 487 | } |
| 488 | printf("(%s)\n", strbuf); |
| 489 | |
| 490 | g_gti = gsmtap_source_init(gsmtap_host, GSMTAP_UDP_PORT, 0); |
| 491 | if (!g_gti) { |
| 492 | perror("unable to open GSMTAP"); |
| 493 | goto close_exit; |
| 494 | } |
| 495 | gsmtap_source_add_sink(g_gti); |
| 496 | |
| 497 | signal(SIGINT, &signal_handler); |
| 498 | |
| 499 | do { |
| 500 | _transp.usb_devh = usb_open_claim_interface(NULL, &ifm_selected); |
| 501 | if (!_transp.usb_devh) { |
| 502 | fprintf(stderr, "can't open USB device\n"); |
| 503 | goto close_exit; |
| 504 | } |
| 505 | |
| 506 | rc = libusb_claim_interface(_transp.usb_devh, ifm_selected.interface); |
| 507 | if (rc < 0) { |
| 508 | fprintf(stderr, "can't claim interface %d; rc=%d\n", ifm_selected.interface, rc); |
| 509 | goto close_exit; |
| 510 | } |
| 511 | |
| 512 | rc = get_usb_ep_addrs(_transp.usb_devh, ifm_selected.interface, &_transp.usb_ep.out, |
| 513 | &_transp.usb_ep.in, &_transp.usb_ep.irq_in); |
| 514 | if (rc < 0) { |
| 515 | fprintf(stderr, "can't obtain EP addrs; rc=%d\n", rc); |
| 516 | goto close_exit; |
| 517 | } |
| 518 | |
| 519 | run_mainloop(); |
| 520 | ret = 0; |
| 521 | |
| 522 | if (_transp.usb_devh) |
| 523 | libusb_release_interface(_transp.usb_devh, 0); |
| 524 | close_exit: |
| 525 | if (_transp.usb_devh) |
| 526 | libusb_close(_transp.usb_devh); |
| 527 | if (keep_running) |
| 528 | sleep(1); |
| 529 | } while (keep_running); |
| 530 | |
| 531 | libusb_exit(NULL); |
| 532 | do_exit: |
| 533 | return ret; |
| 534 | } |