JP Abgrall | 511eca3 | 2014-02-12 13:46:45 -0800 | [diff] [blame] | 1 | /* |
| 2 | * Copyright (c) 2009 Felix Obenhuber |
| 3 | * All rights reserved. |
| 4 | * |
| 5 | * Redistribution and use in source and binary forms, with or without |
| 6 | * modification, are permitted provided that the following conditions |
| 7 | * are met: |
| 8 | * |
| 9 | * 1. Redistributions of source code must retain the above copyright |
| 10 | * notice, this list of conditions and the following disclaimer. |
| 11 | * 2. Redistributions in binary form must reproduce the above copyright |
| 12 | * notice, this list of conditions and the following disclaimer in the |
| 13 | * documentation and/or other materials provided with the distribution. |
| 14 | * 3. The name of the author may not be used to endorse or promote |
| 15 | * products derived from this software without specific prior written |
| 16 | * permission. |
| 17 | * |
| 18 | * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS |
| 19 | * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT |
| 20 | * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR |
| 21 | * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT |
| 22 | * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, |
| 23 | * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT |
| 24 | * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, |
| 25 | * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY |
| 26 | * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT |
| 27 | * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE |
| 28 | * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. |
| 29 | * |
| 30 | * Sockettrace sniffing API implementation for Linux platform |
| 31 | * By Felix Obenhuber <felix@obenhuber.de> |
| 32 | * |
| 33 | */ |
| 34 | |
| 35 | #ifdef HAVE_CONFIG_H |
| 36 | #include "config.h" |
| 37 | #endif |
| 38 | |
| 39 | #include <libusb-1.0/libusb.h> |
| 40 | |
| 41 | #include <stdlib.h> |
| 42 | #include <unistd.h> |
| 43 | #include <fcntl.h> |
| 44 | #include <string.h> |
| 45 | #include <pthread.h> |
| 46 | |
| 47 | #include "pcap-int.h" |
| 48 | #include "pcap-canusb-linux.h" |
| 49 | |
| 50 | #define CANUSB_IFACE "canusb" |
| 51 | |
| 52 | #define CANUSB_VID 0x0403 |
| 53 | #define CANUSB_PID 0x8990 |
| 54 | |
| 55 | #define USE_THREAD 1 |
| 56 | |
| 57 | #if USE_THREAD == 0 |
| 58 | #include <signal.h> |
| 59 | #endif |
| 60 | |
| 61 | |
| 62 | /* forward declaration */ |
| 63 | static int canusb_activate(pcap_t *); |
| 64 | static int canusb_read_linux(pcap_t *, int , pcap_handler , u_char *); |
| 65 | static int canusb_inject_linux(pcap_t *, const void *, size_t); |
| 66 | static int canusb_setfilter_linux(pcap_t *, struct bpf_program *); |
| 67 | static int canusb_setdirection_linux(pcap_t *, pcap_direction_t); |
| 68 | static int canusb_stats_linux(pcap_t *, struct pcap_stat *); |
| 69 | |
| 70 | struct CAN_Msg |
| 71 | { |
| 72 | uint32_t timestamp; |
| 73 | uint32_t id; |
| 74 | uint32_t length; |
| 75 | uint8_t data[8]; |
| 76 | }; |
| 77 | |
| 78 | /* |
| 79 | * Private data for capturing on Linux CANbus USB devices. |
| 80 | */ |
| 81 | struct pcap_canusb { |
| 82 | libusb_context *ctx; |
| 83 | libusb_device_handle *dev; |
| 84 | pthread_t worker; |
| 85 | int rdpipe, wrpipe; |
| 86 | volatile int loop; |
| 87 | }; |
| 88 | |
| 89 | int canusb_findalldevs(pcap_if_t **alldevsp, char *err_str) |
| 90 | { |
| 91 | libusb_context *fdctx; |
| 92 | libusb_device** devs; |
| 93 | unsigned char sernum[65]; |
| 94 | int cnt, i; |
| 95 | |
| 96 | if (libusb_init(&fdctx) != 0) { |
| 97 | /* |
| 98 | * XXX - if this doesn't just mean "no USB file system mounted", |
| 99 | * perhaps we should report a real error rather than just |
| 100 | * saying "no CANUSB devices". |
| 101 | */ |
| 102 | return 0; |
| 103 | } |
| 104 | |
| 105 | cnt = libusb_get_device_list(fdctx,&devs); |
| 106 | |
| 107 | for(i=0;i<cnt;i++) |
| 108 | { |
| 109 | int ret; |
| 110 | // Check if this device is interesting. |
| 111 | struct libusb_device_descriptor desc; |
| 112 | libusb_get_device_descriptor(devs[i],&desc); |
| 113 | |
| 114 | if ((desc.idVendor != CANUSB_VID) || (desc.idProduct != CANUSB_PID)) |
| 115 | continue; //It is not, check next device |
| 116 | |
| 117 | //It is! |
| 118 | libusb_device_handle *dh = NULL; |
| 119 | |
| 120 | if ((ret = libusb_open(devs[i],&dh)) == 0) |
| 121 | { |
| 122 | char dev_name[30]; |
| 123 | char dev_descr[50]; |
| 124 | int n = libusb_get_string_descriptor_ascii(dh,desc.iSerialNumber,sernum,64); |
| 125 | sernum[n] = 0; |
| 126 | |
| 127 | snprintf(dev_name, 30, CANUSB_IFACE"%s", sernum); |
| 128 | snprintf(dev_descr, 50, "CanUSB [%s]", sernum); |
| 129 | |
| 130 | libusb_close(dh); |
| 131 | |
| 132 | if (pcap_add_if(alldevsp, dev_name, 0, dev_descr, err_str) < 0) |
| 133 | { |
| 134 | libusb_free_device_list(devs,1); |
| 135 | libusb_exit(fdctx); |
| 136 | return -1; |
| 137 | } |
| 138 | } |
| 139 | } |
| 140 | |
| 141 | libusb_free_device_list(devs,1); |
| 142 | libusb_exit(fdctx); |
| 143 | return 0; |
| 144 | } |
| 145 | |
| 146 | static libusb_device_handle* canusb_opendevice(struct libusb_context *ctx, char* devserial) |
| 147 | { |
| 148 | libusb_device** devs; |
| 149 | unsigned char serial[65]; |
| 150 | int cnt,i,n; |
| 151 | |
| 152 | cnt = libusb_get_device_list(ctx,&devs); |
| 153 | |
| 154 | for(i=0;i<cnt;i++) |
| 155 | { |
| 156 | // Check if this device is interesting. |
| 157 | struct libusb_device_descriptor desc; |
| 158 | libusb_get_device_descriptor(devs[i],&desc); |
| 159 | |
| 160 | if ((desc.idVendor != CANUSB_VID) || (desc.idProduct != CANUSB_PID)) |
| 161 | continue; |
| 162 | |
| 163 | //Found one! |
| 164 | libusb_device_handle *dh = NULL; |
| 165 | |
| 166 | if (libusb_open(devs[i],&dh) != 0) continue; |
| 167 | |
| 168 | n = libusb_get_string_descriptor_ascii(dh,desc.iSerialNumber,serial,64); |
| 169 | serial[n] = 0; |
| 170 | |
| 171 | if ((devserial) && (strcmp((char *)serial,devserial) != 0)) |
| 172 | { |
| 173 | libusb_close(dh); |
| 174 | continue; |
| 175 | } |
| 176 | |
| 177 | if ((libusb_kernel_driver_active(dh,0)) && (libusb_detach_kernel_driver(dh,0) != 0)) |
| 178 | { |
| 179 | libusb_close(dh); |
| 180 | continue; |
| 181 | } |
| 182 | |
| 183 | if (libusb_set_configuration(dh,1) != 0) |
| 184 | { |
| 185 | libusb_close(dh); |
| 186 | continue; |
| 187 | } |
| 188 | |
| 189 | if (libusb_claim_interface(dh,0) != 0) |
| 190 | { |
| 191 | libusb_close(dh); |
| 192 | continue; |
| 193 | } |
| 194 | |
| 195 | //Fount it! |
| 196 | libusb_free_device_list(devs,1); |
| 197 | return dh; |
| 198 | } |
| 199 | |
| 200 | libusb_free_device_list(devs,1); |
| 201 | return NULL; |
| 202 | } |
| 203 | |
| 204 | |
| 205 | pcap_t * |
| 206 | canusb_create(const char *device, char *ebuf, int *is_ours) |
| 207 | { |
| 208 | const char *cp; |
| 209 | char *cpend; |
| 210 | long devnum; |
| 211 | pcap_t* p; |
| 212 | struct pcap_canusb *canusb; |
| 213 | |
| 214 | /* Does this look like a DAG device? */ |
| 215 | cp = strrchr(device, '/'); |
| 216 | if (cp == NULL) |
| 217 | cp = device; |
| 218 | /* Does it begin with "canusb"? */ |
| 219 | if (strncmp(cp, "canusb", 6) != 0) { |
| 220 | /* Nope, doesn't begin with "canusb" */ |
| 221 | *is_ours = 0; |
| 222 | return NULL; |
| 223 | } |
| 224 | /* Yes - is "canusb" followed by a number? */ |
| 225 | cp += 6; |
| 226 | devnum = strtol(cp, &cpend, 10); |
| 227 | if (cpend == cp || *cpend != '\0') { |
| 228 | /* Not followed by a number. */ |
| 229 | *is_ours = 0; |
| 230 | return NULL; |
| 231 | } |
| 232 | if (devnum < 0) { |
| 233 | /* Followed by a non-valid number. */ |
| 234 | *is_ours = 0; |
| 235 | return NULL; |
| 236 | } |
| 237 | |
| 238 | /* OK, it's probably ours. */ |
| 239 | *is_ours = 1; |
| 240 | |
| 241 | p = pcap_create_common(device, ebuf, sizeof (struct pcap_canusb)); |
| 242 | if (p == NULL) |
| 243 | return (NULL); |
| 244 | |
| 245 | canusb = p->priv; |
| 246 | canusb->ctx = NULL; |
| 247 | canusb->dev = NULL; |
| 248 | canusb->rdpipe = -1; |
| 249 | canusb->wrpipe = -1; |
| 250 | |
| 251 | p->activate_op = canusb_activate; |
| 252 | |
| 253 | return (p); |
| 254 | } |
| 255 | |
| 256 | |
| 257 | static void* canusb_capture_thread(void *arg) |
| 258 | { |
| 259 | struct pcap_canusb *canusb = arg; |
| 260 | int i; |
| 261 | struct |
| 262 | { |
| 263 | uint8_t rxsz, txsz; |
| 264 | } status; |
| 265 | |
| 266 | fcntl(canusb->wrpipe, F_SETFL, O_NONBLOCK); |
| 267 | |
| 268 | while(canusb->loop) |
| 269 | { |
| 270 | int sz; |
| 271 | struct CAN_Msg msg; |
| 272 | |
| 273 | libusb_interrupt_transfer(canusb->dev, 0x81, (unsigned char*)&status, sizeof(status), &sz, 100); |
| 274 | //HACK!!!!! -> drop buffered data, read new one by reading twice. |
| 275 | libusb_interrupt_transfer(canusb->dev, 0x81, (unsigned char*)&status, sizeof(status), &sz, 100); |
| 276 | |
| 277 | for(i = 0; i<status.rxsz; i++) |
| 278 | { |
| 279 | libusb_bulk_transfer(canusb->dev, 0x85, (unsigned char*)&msg, sizeof(msg), &sz, 100); |
| 280 | write(canusb->wrpipe, &msg, sizeof(msg)); |
| 281 | } |
| 282 | |
| 283 | } |
| 284 | |
| 285 | return NULL; |
| 286 | } |
| 287 | |
| 288 | static int canusb_startcapture(struct pcap_canusb* this) |
| 289 | { |
| 290 | int pipefd[2]; |
| 291 | |
| 292 | if (pipe(pipefd) == -1) |
| 293 | return -1; |
| 294 | |
| 295 | this->rdpipe = pipefd[0]; |
| 296 | this->wrpipe = pipefd[1]; |
| 297 | |
| 298 | this->loop = 1; |
| 299 | pthread_create(&this->worker, NULL, canusb_capture_thread, this); |
| 300 | |
| 301 | return this->rdpipe; |
| 302 | } |
| 303 | |
| 304 | static void canusb_clearbufs(struct pcap_canusb* this) |
| 305 | { |
| 306 | unsigned char cmd[16]; |
| 307 | int al; |
| 308 | |
| 309 | cmd[0] = 1; //Empty incoming buffer |
| 310 | cmd[1] = 1; //Empty outgoing buffer |
| 311 | cmd[3] = 0; //Not a write to serial number |
| 312 | memset(&cmd[4],0,16-4); |
| 313 | |
| 314 | libusb_interrupt_transfer(this->dev, 0x1,cmd,16,&al,100); |
| 315 | } |
| 316 | |
| 317 | |
| 318 | static void canusb_close(pcap_t* handle) |
| 319 | { |
| 320 | struct pcap_canusb *canusb = handle->priv; |
| 321 | |
| 322 | canusb->loop = 0; |
| 323 | pthread_join(canusb->worker, NULL); |
| 324 | |
| 325 | if (canusb->dev) |
| 326 | { |
| 327 | libusb_close(canusb->dev); |
| 328 | canusb->dev = NULL; |
| 329 | } |
| 330 | if (canusb->ctx) |
| 331 | { |
| 332 | libusb_exit(canusb->ctx); |
| 333 | canusb->ctx = NULL; |
| 334 | } |
| 335 | } |
| 336 | |
| 337 | |
| 338 | |
| 339 | static int canusb_activate(pcap_t* handle) |
| 340 | { |
| 341 | struct pcap_canusb *canusb = handle->priv; |
| 342 | char *serial; |
| 343 | |
| 344 | if (libusb_init(&canusb->ctx) != 0) { |
| 345 | /* |
| 346 | * XXX - what causes this to fail? |
| 347 | */ |
| 348 | snprintf(handle->errbuf, PCAP_ERRBUF_SIZE, "libusb_init() failed"); |
| 349 | return PCAP_ERROR; |
| 350 | } |
| 351 | |
| 352 | handle->read_op = canusb_read_linux; |
| 353 | |
| 354 | handle->inject_op = canusb_inject_linux; |
| 355 | handle->setfilter_op = canusb_setfilter_linux; |
| 356 | handle->setdirection_op = canusb_setdirection_linux; |
| 357 | handle->getnonblock_op = pcap_getnonblock_fd; |
| 358 | handle->setnonblock_op = pcap_setnonblock_fd; |
| 359 | handle->stats_op = canusb_stats_linux; |
| 360 | handle->cleanup_op = canusb_close; |
| 361 | |
| 362 | /* Initialize some components of the pcap structure. */ |
| 363 | handle->bufsize = 32; |
| 364 | handle->offset = 8; |
| 365 | handle->linktype = DLT_CAN_SOCKETCAN; |
| 366 | handle->set_datalink_op = NULL; |
| 367 | |
| 368 | serial = handle->opt.source + strlen(CANUSB_IFACE); |
| 369 | |
| 370 | canusb->dev = canusb_opendevice(canusb->ctx, serial); |
| 371 | if (!canusb->dev) |
| 372 | { |
| 373 | libusb_exit(canusb->ctx); |
| 374 | snprintf(handle->errbuf, PCAP_ERRBUF_SIZE, "Can't open USB Device"); |
| 375 | return PCAP_ERROR; |
| 376 | } |
| 377 | |
| 378 | canusb_clearbufs(canusb); |
| 379 | |
| 380 | handle->fd = canusb_startcapture(canusb); |
| 381 | handle->selectable_fd = handle->fd; |
| 382 | |
| 383 | return 0; |
| 384 | } |
| 385 | |
| 386 | |
| 387 | |
| 388 | |
| 389 | static int |
| 390 | canusb_read_linux(pcap_t *handle, int max_packets, pcap_handler callback, u_char *user) |
| 391 | { |
| 392 | static struct timeval firstpacket = { -1, -1}; |
| 393 | int i = 0; |
| 394 | struct CAN_Msg msg; |
| 395 | struct pcap_pkthdr pkth; |
| 396 | |
| 397 | while(i < max_packets) |
| 398 | { |
| 399 | int n; |
| 400 | usleep(10 * 1000); |
| 401 | n = read(handle->fd, &msg, sizeof(msg)); |
| 402 | if (n <= 0) |
| 403 | break; |
| 404 | pkth.caplen = pkth.len = n; |
| 405 | pkth.caplen -= 4; |
| 406 | pkth.caplen -= 8 - msg.length; |
| 407 | |
| 408 | if ((firstpacket.tv_sec == -1) && (firstpacket.tv_usec == -1)) |
| 409 | gettimeofday(&firstpacket, NULL); |
| 410 | |
| 411 | pkth.ts.tv_usec = firstpacket.tv_usec + (msg.timestamp % 100) * 10000; |
| 412 | pkth.ts.tv_sec = firstpacket.tv_usec + (msg.timestamp / 100); |
| 413 | if (pkth.ts.tv_usec > 1000000) |
| 414 | { |
| 415 | pkth.ts.tv_usec -= 1000000; |
| 416 | pkth.ts.tv_sec++; |
| 417 | } |
| 418 | |
| 419 | callback(user, &pkth, (void*)&msg.id); |
| 420 | i++; |
| 421 | } |
| 422 | |
| 423 | return i; |
| 424 | } |
| 425 | |
| 426 | |
| 427 | static int |
| 428 | canusb_inject_linux(pcap_t *handle, const void *buf, size_t size) |
| 429 | { |
| 430 | /* not yet implemented */ |
| 431 | snprintf(handle->errbuf, PCAP_ERRBUF_SIZE, "inject not supported on canusb devices"); |
| 432 | return (-1); |
| 433 | } |
| 434 | |
| 435 | |
| 436 | static int |
| 437 | canusb_stats_linux(pcap_t *handle, struct pcap_stat *stats) |
| 438 | { |
| 439 | /* not yet implemented */ |
| 440 | stats->ps_recv = 0; /* number of packets received */ |
| 441 | stats->ps_drop = 0; /* number of packets dropped */ |
| 442 | stats->ps_ifdrop = 0; /* drops by interface -- only supported on some platforms */ |
| 443 | return 0; |
| 444 | } |
| 445 | |
| 446 | |
| 447 | static int |
| 448 | canusb_setfilter_linux(pcap_t *p, struct bpf_program *fp) |
| 449 | { |
| 450 | /* not yet implemented */ |
| 451 | return 0; |
| 452 | } |
| 453 | |
| 454 | |
| 455 | static int |
| 456 | canusb_setdirection_linux(pcap_t *p, pcap_direction_t d) |
| 457 | { |
| 458 | /* no support for PCAP_D_OUT */ |
| 459 | if (d == PCAP_D_OUT) |
| 460 | { |
| 461 | snprintf(p->errbuf, sizeof(p->errbuf), |
| 462 | "Setting direction to PCAP_D_OUT is not supported on this interface"); |
| 463 | return -1; |
| 464 | } |
| 465 | |
| 466 | p->direction = d; |
| 467 | |
| 468 | return 0; |
| 469 | } |
| 470 | |
| 471 | |
| 472 | /* eof */ |