1 /*- 2 * Copyright (c) 2010 Weongyo Jeong <weongyo@freebsd.org> 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 * 1. Redistributions of source code must retain the above copyright 9 * notice, this list of conditions and the following disclaimer, 10 * without modification. 11 * 2. Redistributions in binary form must reproduce at minimum a disclaimer 12 * similar to the "NO WARRANTY" disclaimer below ("Disclaimer") and any 13 * redistribution must be conditioned upon including a substantially 14 * similar Disclaimer requirement for further binary redistribution. 15 * 16 * NO WARRANTY 17 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS 18 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT 19 * LIMITED TO, THE IMPLIED WARRANTIES OF NONINFRINGEMENT, MERCHANTIBILITY 20 * AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL 21 * THE COPYRIGHT HOLDERS OR CONTRIBUTORS BE LIABLE FOR SPECIAL, EXEMPLARY, 22 * OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF 23 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS 24 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER 25 * IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 26 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF 27 * THE POSSIBILITY OF SUCH DAMAGES. 28 * 29 * $FreeBSD$ 30 */ 31 32 #include <sys/param.h> 33 #include <sys/endian.h> 34 #include <sys/ioctl.h> 35 #include <sys/socket.h> 36 #include <sys/stat.h> 37 #include <sys/sysctl.h> 38 #include <sys/utsname.h> 39 #include <sys/queue.h> 40 #include <net/if.h> 41 #include <net/bpf.h> 42 #include <dev/usb/usb.h> 43 #include <dev/usb/usb_pf.h> 44 #include <dev/usb/usbdi.h> 45 #include <errno.h> 46 #include <fcntl.h> 47 #include <limits.h> 48 #include <stdio.h> 49 #include <stdlib.h> 50 #include <stdint.h> 51 #include <string.h> 52 #include <time.h> 53 #include <unistd.h> 54 #include <sysexits.h> 55 #include <err.h> 56 57 #define BPF_STORE_JUMP(x,_c,_k,_jt,_jf) do { \ 58 (x).code = (_c); \ 59 (x).k = (_k); \ 60 (x).jt = (_jt); \ 61 (x).jf = (_jf); \ 62 } while (0) 63 64 #define BPF_STORE_STMT(x,_c,_k) do { \ 65 (x).code = (_c); \ 66 (x).k = (_k); \ 67 (x).jt = 0; \ 68 (x).jf = 0; \ 69 } while (0) 70 71 struct usb_filt { 72 STAILQ_ENTRY(usb_filt) entry; 73 int unit; 74 int endpoint; 75 }; 76 77 struct usbcap { 78 int fd; /* fd for /dev/usbpf */ 79 uint32_t bufsize; 80 uint8_t *buffer; 81 82 /* for -w option */ 83 int wfd; 84 /* for -r option */ 85 int rfd; 86 /* for -b option */ 87 int bfd; 88 }; 89 90 struct usbcap_filehdr { 91 uint32_t magic; 92 #define USBCAP_FILEHDR_MAGIC 0x9a90000e 93 uint8_t major; 94 uint8_t minor; 95 uint8_t reserved[26]; 96 } __packed; 97 98 #define HEADER_ALIGN(x,a) (((x) + (a) - 1) & ~((a) - 1)) 99 100 struct header_32 { 101 /* capture timestamp */ 102 uint32_t ts_sec; 103 uint32_t ts_usec; 104 /* data length and alignment information */ 105 uint32_t caplen; 106 uint32_t datalen; 107 uint8_t hdrlen; 108 uint8_t align; 109 } __packed; 110 111 static int doexit = 0; 112 static int pkt_captured = 0; 113 static int verbose = 0; 114 static int uf_minor; 115 static const char *i_arg = "usbus0"; 116 static const char *r_arg = NULL; 117 static const char *w_arg = NULL; 118 static const char *b_arg = NULL; 119 static struct usbcap uc; 120 static const char *errstr_table[USB_ERR_MAX] = { 121 [USB_ERR_NORMAL_COMPLETION] = "0", 122 [USB_ERR_PENDING_REQUESTS] = "PENDING_REQUESTS", 123 [USB_ERR_NOT_STARTED] = "NOT_STARTED", 124 [USB_ERR_INVAL] = "INVAL", 125 [USB_ERR_NOMEM] = "NOMEM", 126 [USB_ERR_CANCELLED] = "CANCELLED", 127 [USB_ERR_BAD_ADDRESS] = "BAD_ADDRESS", 128 [USB_ERR_BAD_BUFSIZE] = "BAD_BUFSIZE", 129 [USB_ERR_BAD_FLAG] = "BAD_FLAG", 130 [USB_ERR_NO_CALLBACK] = "NO_CALLBACK", 131 [USB_ERR_IN_USE] = "IN_USE", 132 [USB_ERR_NO_ADDR] = "NO_ADDR", 133 [USB_ERR_NO_PIPE] = "NO_PIPE", 134 [USB_ERR_ZERO_NFRAMES] = "ZERO_NFRAMES", 135 [USB_ERR_ZERO_MAXP] = "ZERO_MAXP", 136 [USB_ERR_SET_ADDR_FAILED] = "SET_ADDR_FAILED", 137 [USB_ERR_NO_POWER] = "NO_POWER", 138 [USB_ERR_TOO_DEEP] = "TOO_DEEP", 139 [USB_ERR_IOERROR] = "IOERROR", 140 [USB_ERR_NOT_CONFIGURED] = "NOT_CONFIGURED", 141 [USB_ERR_TIMEOUT] = "TIMEOUT", 142 [USB_ERR_SHORT_XFER] = "SHORT_XFER", 143 [USB_ERR_STALLED] = "STALLED", 144 [USB_ERR_INTERRUPTED] = "INTERRUPTED", 145 [USB_ERR_DMA_LOAD_FAILED] = "DMA_LOAD_FAILED", 146 [USB_ERR_BAD_CONTEXT] = "BAD_CONTEXT", 147 [USB_ERR_NO_ROOT_HUB] = "NO_ROOT_HUB", 148 [USB_ERR_NO_INTR_THREAD] = "NO_INTR_THREAD", 149 [USB_ERR_NOT_LOCKED] = "NOT_LOCKED", 150 }; 151 152 static const char *xfertype_table[4] = { 153 [UE_CONTROL] = "CTRL", 154 [UE_ISOCHRONOUS] = "ISOC", 155 [UE_BULK] = "BULK", 156 [UE_INTERRUPT] = "INTR" 157 }; 158 159 static const char *speed_table[USB_SPEED_MAX] = { 160 [USB_SPEED_FULL] = "FULL", 161 [USB_SPEED_HIGH] = "HIGH", 162 [USB_SPEED_LOW] = "LOW", 163 [USB_SPEED_VARIABLE] = "VARI", 164 [USB_SPEED_SUPER] = "SUPER", 165 }; 166 167 static STAILQ_HEAD(,usb_filt) usb_filt_head = 168 STAILQ_HEAD_INITIALIZER(usb_filt_head); 169 170 static void 171 add_filter(int usb_filt_unit, int usb_filt_ep) 172 { 173 struct usb_filt *puf; 174 175 puf = malloc(sizeof(struct usb_filt)); 176 if (puf == NULL) 177 errx(EX_SOFTWARE, "Out of memory."); 178 179 puf->unit = usb_filt_unit; 180 puf->endpoint = usb_filt_ep; 181 182 STAILQ_INSERT_TAIL(&usb_filt_head, puf, entry); 183 } 184 185 static void 186 make_filter(struct bpf_program *pprog, int snapshot) 187 { 188 struct usb_filt *puf; 189 struct bpf_insn *dynamic_insn; 190 int len; 191 192 len = 0; 193 194 STAILQ_FOREACH(puf, &usb_filt_head, entry) 195 len++; 196 197 dynamic_insn = malloc(((len * 5) + 1) * sizeof(struct bpf_insn)); 198 199 if (dynamic_insn == NULL) 200 errx(EX_SOFTWARE, "Out of memory."); 201 202 len++; 203 204 if (len == 1) { 205 /* accept all packets */ 206 207 BPF_STORE_STMT(dynamic_insn[0], BPF_RET | BPF_K, snapshot); 208 209 goto done; 210 } 211 212 len = 0; 213 214 STAILQ_FOREACH(puf, &usb_filt_head, entry) { 215 const int addr_off = (uintptr_t)&((struct usbpf_pkthdr *)0)->up_address; 216 const int addr_ep = (uintptr_t)&((struct usbpf_pkthdr *)0)->up_endpoint; 217 218 if (puf->unit != -1) { 219 if (puf->endpoint != -1) { 220 BPF_STORE_STMT(dynamic_insn[len], 221 BPF_LD | BPF_B | BPF_ABS, addr_off); 222 len++; 223 BPF_STORE_JUMP(dynamic_insn[len], 224 BPF_JMP | BPF_JEQ | BPF_K, (uint8_t)puf->unit, 0, 3); 225 len++; 226 BPF_STORE_STMT(dynamic_insn[len], 227 BPF_LD | BPF_W | BPF_ABS, addr_ep); 228 len++; 229 BPF_STORE_JUMP(dynamic_insn[len], 230 BPF_JMP | BPF_JEQ | BPF_K, htobe32(puf->endpoint), 0, 1); 231 len++; 232 } else { 233 BPF_STORE_STMT(dynamic_insn[len], 234 BPF_LD | BPF_B | BPF_ABS, addr_off); 235 len++; 236 BPF_STORE_JUMP(dynamic_insn[len], 237 BPF_JMP | BPF_JEQ | BPF_K, (uint8_t)puf->unit, 0, 1); 238 len++; 239 } 240 } else { 241 if (puf->endpoint != -1) { 242 BPF_STORE_STMT(dynamic_insn[len], 243 BPF_LD | BPF_W | BPF_ABS, addr_ep); 244 len++; 245 BPF_STORE_JUMP(dynamic_insn[len], 246 BPF_JMP | BPF_JEQ | BPF_K, htobe32(puf->endpoint), 0, 1); 247 len++; 248 } 249 } 250 BPF_STORE_STMT(dynamic_insn[len], 251 BPF_RET | BPF_K, snapshot); 252 len++; 253 } 254 255 BPF_STORE_STMT(dynamic_insn[len], BPF_RET | BPF_K, 0); 256 len++; 257 258 done: 259 pprog->bf_len = len; 260 pprog->bf_insns = dynamic_insn; 261 } 262 263 static int 264 match_filter(int unit, int endpoint) 265 { 266 struct usb_filt *puf; 267 268 if (STAILQ_FIRST(&usb_filt_head) == NULL) 269 return (1); 270 271 STAILQ_FOREACH(puf, &usb_filt_head, entry) { 272 if ((puf->unit == -1 || puf->unit == unit) && 273 (puf->endpoint == -1 || puf->endpoint == endpoint)) 274 return (1); 275 } 276 return (0); 277 } 278 279 static void 280 free_filter(struct bpf_program *pprog) 281 { 282 struct usb_filt *puf; 283 284 while ((puf = STAILQ_FIRST(&usb_filt_head)) != NULL) { 285 STAILQ_REMOVE_HEAD(&usb_filt_head, entry); 286 free(puf); 287 } 288 free(pprog->bf_insns); 289 } 290 291 static void 292 handle_sigint(int sig) 293 { 294 295 (void)sig; 296 doexit = 1; 297 } 298 299 #define FLAGS(x, name) \ 300 (((x) & USBPF_FLAG_##name) ? #name "|" : "") 301 302 #define STATUS(x, name) \ 303 (((x) & USBPF_STATUS_##name) ? #name "|" : "") 304 305 static const char * 306 usb_errstr(uint32_t error) 307 { 308 if (error >= USB_ERR_MAX || errstr_table[error] == NULL) 309 return ("UNKNOWN"); 310 else 311 return (errstr_table[error]); 312 } 313 314 static const char * 315 usb_speedstr(uint8_t speed) 316 { 317 if (speed >= USB_SPEED_MAX || speed_table[speed] == NULL) 318 return ("UNKNOWN"); 319 else 320 return (speed_table[speed]); 321 } 322 323 static void 324 print_flags(uint32_t flags) 325 { 326 printf(" flags %#x <%s%s%s%s%s%s%s%s%s0>\n", 327 flags, 328 FLAGS(flags, FORCE_SHORT_XFER), 329 FLAGS(flags, SHORT_XFER_OK), 330 FLAGS(flags, SHORT_FRAMES_OK), 331 FLAGS(flags, PIPE_BOF), 332 FLAGS(flags, PROXY_BUFFER), 333 FLAGS(flags, EXT_BUFFER), 334 FLAGS(flags, MANUAL_STATUS), 335 FLAGS(flags, NO_PIPE_OK), 336 FLAGS(flags, STALL_PIPE)); 337 } 338 339 static void 340 print_status(uint32_t status) 341 { 342 printf(" status %#x <%s%s%s%s%s%s%s%s%s%s%s%s%s%s%s%s%s%s%s%s0>\n", 343 status, 344 STATUS(status, OPEN), 345 STATUS(status, TRANSFERRING), 346 STATUS(status, DID_DMA_DELAY), 347 STATUS(status, DID_CLOSE), 348 STATUS(status, DRAINING), 349 STATUS(status, STARTED), 350 STATUS(status, BW_RECLAIMED), 351 STATUS(status, CONTROL_XFR), 352 STATUS(status, CONTROL_HDR), 353 STATUS(status, CONTROL_ACT), 354 STATUS(status, CONTROL_STALL), 355 STATUS(status, SHORT_FRAMES_OK), 356 STATUS(status, SHORT_XFER_OK), 357 STATUS(status, BDMA_ENABLE), 358 STATUS(status, BDMA_NO_POST_SYNC), 359 STATUS(status, BDMA_SETUP), 360 STATUS(status, ISOCHRONOUS_XFR), 361 STATUS(status, CURR_DMA_SET), 362 STATUS(status, CAN_CANCEL_IMMED), 363 STATUS(status, DOING_CALLBACK)); 364 } 365 366 /* 367 * Dump a byte into hex format. 368 */ 369 static void 370 hexbyte(char *buf, uint8_t temp) 371 { 372 uint8_t lo; 373 uint8_t hi; 374 375 lo = temp & 0xF; 376 hi = temp >> 4; 377 378 if (hi < 10) 379 buf[0] = '0' + hi; 380 else 381 buf[0] = 'A' + hi - 10; 382 383 if (lo < 10) 384 buf[1] = '0' + lo; 385 else 386 buf[1] = 'A' + lo - 10; 387 } 388 389 /* 390 * Display a region in traditional hexdump format. 391 */ 392 static void 393 hexdump(const uint8_t *region, uint32_t len) 394 { 395 const uint8_t *line; 396 char linebuf[128]; 397 int i; 398 int x; 399 int c; 400 401 for (line = region; line < (region + len); line += 16) { 402 403 i = 0; 404 405 linebuf[i] = ' '; 406 hexbyte(linebuf + i + 1, ((line - region) >> 8) & 0xFF); 407 hexbyte(linebuf + i + 3, (line - region) & 0xFF); 408 linebuf[i + 5] = ' '; 409 linebuf[i + 6] = ' '; 410 i += 7; 411 412 for (x = 0; x < 16; x++) { 413 if ((line + x) < (region + len)) { 414 hexbyte(linebuf + i, 415 *(const u_int8_t *)(line + x)); 416 } else { 417 linebuf[i] = '-'; 418 linebuf[i + 1] = '-'; 419 } 420 linebuf[i + 2] = ' '; 421 if (x == 7) { 422 linebuf[i + 3] = ' '; 423 i += 4; 424 } else { 425 i += 3; 426 } 427 } 428 linebuf[i] = ' '; 429 linebuf[i + 1] = '|'; 430 i += 2; 431 for (x = 0; x < 16; x++) { 432 if ((line + x) < (region + len)) { 433 c = *(const u_int8_t *)(line + x); 434 /* !isprint(c) */ 435 if ((c < ' ') || (c > '~')) 436 c = '.'; 437 linebuf[i] = c; 438 } else { 439 linebuf[i] = ' '; 440 } 441 i++; 442 } 443 linebuf[i] = '|'; 444 linebuf[i + 1] = 0; 445 i += 2; 446 puts(linebuf); 447 } 448 } 449 450 static void 451 print_apacket(const struct header_32 *hdr, const uint8_t *ptr, int ptr_len) 452 { 453 struct tm *tm; 454 struct usbpf_pkthdr up_temp; 455 struct usbpf_pkthdr *up; 456 struct timeval tv; 457 size_t len; 458 uint32_t x; 459 char buf[64]; 460 461 ptr += USBPF_HDR_LEN; 462 ptr_len -= USBPF_HDR_LEN; 463 if (ptr_len < 0) 464 return; 465 466 /* make sure we don't change the source buffer */ 467 memcpy(&up_temp, ptr - USBPF_HDR_LEN, sizeof(up_temp)); 468 up = &up_temp; 469 470 /* 471 * A packet from the kernel is based on little endian byte 472 * order. 473 */ 474 up->up_totlen = le32toh(up->up_totlen); 475 up->up_busunit = le32toh(up->up_busunit); 476 up->up_flags = le32toh(up->up_flags); 477 up->up_status = le32toh(up->up_status); 478 up->up_error = le32toh(up->up_error); 479 up->up_interval = le32toh(up->up_interval); 480 up->up_frames = le32toh(up->up_frames); 481 up->up_packet_size = le32toh(up->up_packet_size); 482 up->up_packet_count = le32toh(up->up_packet_count); 483 up->up_endpoint = le32toh(up->up_endpoint); 484 485 if (!match_filter(up->up_address, up->up_endpoint)) 486 return; 487 488 tv.tv_sec = hdr->ts_sec; 489 tv.tv_usec = hdr->ts_usec; 490 tm = localtime(&tv.tv_sec); 491 492 len = strftime(buf, sizeof(buf), "%H:%M:%S", tm); 493 494 if (verbose >= 0) { 495 printf("%.*s.%06ld usbus%d.%d %s-%s-EP=%08x,SPD=%s,NFR=%d,SLEN=%d,IVAL=%d%s%s\n", 496 (int)len, buf, tv.tv_usec, 497 (int)up->up_busunit, (int)up->up_address, 498 (up->up_type == USBPF_XFERTAP_SUBMIT) ? "SUBM" : "DONE", 499 xfertype_table[up->up_xfertype], 500 (unsigned int)up->up_endpoint, 501 usb_speedstr(up->up_speed), 502 (int)up->up_frames, 503 (int)(up->up_totlen - USBPF_HDR_LEN - 504 (USBPF_FRAME_HDR_LEN * up->up_frames)), 505 (int)up->up_interval, 506 (up->up_type == USBPF_XFERTAP_DONE) ? ",ERR=" : "", 507 (up->up_type == USBPF_XFERTAP_DONE) ? 508 usb_errstr(up->up_error) : ""); 509 } 510 511 if (verbose >= 1 || b_arg != NULL) { 512 for (x = 0; x != up->up_frames; x++) { 513 const struct usbpf_framehdr *uf; 514 uint32_t framelen; 515 uint32_t flags; 516 517 uf = (const struct usbpf_framehdr *)ptr; 518 ptr += USBPF_FRAME_HDR_LEN; 519 ptr_len -= USBPF_FRAME_HDR_LEN; 520 if (ptr_len < 0) 521 return; 522 523 framelen = le32toh(uf->length); 524 flags = le32toh(uf->flags); 525 526 if (verbose >= 1) { 527 printf(" frame[%u] %s %d bytes\n", 528 (unsigned int)x, 529 (flags & USBPF_FRAMEFLAG_READ) ? "READ" : "WRITE", 530 (int)framelen); 531 } 532 533 if (flags & USBPF_FRAMEFLAG_DATA_FOLLOWS) { 534 535 int tot_frame_len; 536 537 tot_frame_len = USBPF_FRAME_ALIGN(framelen); 538 539 ptr_len -= tot_frame_len; 540 541 if (tot_frame_len < 0 || 542 (int)framelen < 0 || (int)ptr_len < 0) 543 break; 544 545 if (b_arg != NULL) { 546 struct usbcap *p = &uc; 547 int ret; 548 ret = write(p->bfd, ptr, framelen); 549 if (ret != (int)framelen) 550 err(EXIT_FAILURE, "Could not write binary data"); 551 } 552 if (verbose >= 1) 553 hexdump(ptr, framelen); 554 555 ptr += tot_frame_len; 556 } 557 } 558 } 559 if (verbose >= 2) 560 print_flags(up->up_flags); 561 if (verbose >= 3) 562 print_status(up->up_status); 563 } 564 565 static void 566 fix_packets(uint8_t *data, const int datalen) 567 { 568 struct header_32 temp; 569 uint8_t *ptr; 570 uint8_t *next; 571 uint32_t hdrlen; 572 uint32_t caplen; 573 574 for (ptr = data; ptr < (data + datalen); ptr = next) { 575 576 const struct bpf_hdr *hdr; 577 578 hdr = (const struct bpf_hdr *)ptr; 579 580 temp.ts_sec = htole32(hdr->bh_tstamp.tv_sec); 581 temp.ts_usec = htole32(hdr->bh_tstamp.tv_usec); 582 temp.caplen = htole32(hdr->bh_caplen); 583 temp.datalen = htole32(hdr->bh_datalen); 584 temp.hdrlen = hdr->bh_hdrlen; 585 temp.align = BPF_WORDALIGN(1); 586 587 hdrlen = hdr->bh_hdrlen; 588 caplen = hdr->bh_caplen; 589 590 if ((hdrlen >= sizeof(temp)) && (hdrlen <= 255) && 591 ((ptr + hdrlen) <= (data + datalen))) { 592 memcpy(ptr, &temp, sizeof(temp)); 593 memset(ptr + sizeof(temp), 0, hdrlen - sizeof(temp)); 594 } else { 595 err(EXIT_FAILURE, "Invalid header length %d", hdrlen); 596 } 597 598 next = ptr + BPF_WORDALIGN(hdrlen + caplen); 599 600 if (next <= ptr) 601 err(EXIT_FAILURE, "Invalid length"); 602 } 603 } 604 605 static void 606 print_packets(uint8_t *data, const int datalen) 607 { 608 struct header_32 temp; 609 uint8_t *ptr; 610 uint8_t *next; 611 612 for (ptr = data; ptr < (data + datalen); ptr = next) { 613 614 const struct header_32 *hdr32; 615 616 hdr32 = (const struct header_32 *)ptr; 617 618 temp.ts_sec = le32toh(hdr32->ts_sec); 619 temp.ts_usec = le32toh(hdr32->ts_usec); 620 temp.caplen = le32toh(hdr32->caplen); 621 temp.datalen = le32toh(hdr32->datalen); 622 temp.hdrlen = hdr32->hdrlen; 623 temp.align = hdr32->align; 624 625 next = ptr + HEADER_ALIGN(temp.hdrlen + temp.caplen, temp.align); 626 627 if (next <= ptr) 628 err(EXIT_FAILURE, "Invalid length"); 629 630 if (verbose >= 0 || r_arg != NULL || b_arg != NULL) { 631 print_apacket(&temp, ptr + 632 temp.hdrlen, temp.caplen); 633 } 634 pkt_captured++; 635 } 636 } 637 638 static void 639 write_packets(struct usbcap *p, const uint8_t *data, const int datalen) 640 { 641 int len = htole32(datalen); 642 int ret; 643 644 ret = write(p->wfd, &len, sizeof(int)); 645 if (ret != sizeof(int)) { 646 err(EXIT_FAILURE, "Could not write length " 647 "field of USB data payload"); 648 } 649 ret = write(p->wfd, data, datalen); 650 if (ret != datalen) { 651 err(EXIT_FAILURE, "Could not write " 652 "complete USB data payload"); 653 } 654 } 655 656 static void 657 read_file(struct usbcap *p) 658 { 659 int datalen; 660 int ret; 661 uint8_t *data; 662 663 while ((ret = read(p->rfd, &datalen, sizeof(int))) == sizeof(int)) { 664 datalen = le32toh(datalen); 665 data = malloc(datalen); 666 if (data == NULL) 667 errx(EX_SOFTWARE, "Out of memory."); 668 ret = read(p->rfd, data, datalen); 669 if (ret != datalen) { 670 err(EXIT_FAILURE, "Could not read complete " 671 "USB data payload"); 672 } 673 if (uf_minor == 2) 674 fix_packets(data, datalen); 675 676 print_packets(data, datalen); 677 free(data); 678 } 679 } 680 681 static void 682 do_loop(struct usbcap *p) 683 { 684 int cc; 685 686 while (doexit == 0) { 687 cc = read(p->fd, (uint8_t *)p->buffer, p->bufsize); 688 if (cc < 0) { 689 switch (errno) { 690 case EINTR: 691 break; 692 default: 693 fprintf(stderr, "read: %s\n", strerror(errno)); 694 return; 695 } 696 continue; 697 } 698 if (cc == 0) 699 continue; 700 701 fix_packets(p->buffer, cc); 702 703 if (w_arg != NULL) 704 write_packets(p, p->buffer, cc); 705 print_packets(p->buffer, cc); 706 } 707 } 708 709 static void 710 init_rfile(struct usbcap *p) 711 { 712 struct usbcap_filehdr uf; 713 int ret; 714 715 p->rfd = open(r_arg, O_RDONLY); 716 if (p->rfd < 0) { 717 err(EXIT_FAILURE, "Could not open " 718 "'%s' for read", r_arg); 719 } 720 ret = read(p->rfd, &uf, sizeof(uf)); 721 if (ret != sizeof(uf)) { 722 err(EXIT_FAILURE, "Could not read USB capture " 723 "file header"); 724 } 725 if (le32toh(uf.magic) != USBCAP_FILEHDR_MAGIC) { 726 errx(EX_SOFTWARE, "Invalid magic field(0x%08x) " 727 "in USB capture file header.", 728 (unsigned int)le32toh(uf.magic)); 729 } 730 if (uf.major != 0) { 731 errx(EX_SOFTWARE, "Invalid major version(%d) " 732 "field in USB capture file header.", (int)uf.major); 733 } 734 735 uf_minor = uf.minor; 736 737 if (uf.minor != 3 && uf.minor != 2) { 738 errx(EX_SOFTWARE, "Invalid minor version(%d) " 739 "field in USB capture file header.", (int)uf.minor); 740 } 741 } 742 743 static void 744 init_wfile(struct usbcap *p) 745 { 746 struct usbcap_filehdr uf; 747 int ret; 748 749 p->wfd = open(w_arg, O_CREAT | O_TRUNC | O_WRONLY, S_IRUSR | S_IWUSR); 750 if (p->wfd < 0) { 751 err(EXIT_FAILURE, "Could not open " 752 "'%s' for write", w_arg); 753 } 754 memset(&uf, 0, sizeof(uf)); 755 uf.magic = htole32(USBCAP_FILEHDR_MAGIC); 756 uf.major = 0; 757 uf.minor = 3; 758 ret = write(p->wfd, (const void *)&uf, sizeof(uf)); 759 if (ret != sizeof(uf)) { 760 err(EXIT_FAILURE, "Could not write " 761 "USB capture header"); 762 } 763 } 764 765 static void 766 usage(void) 767 { 768 769 #define FMT " %-14s %s\n" 770 fprintf(stderr, "usage: usbdump [options]\n"); 771 fprintf(stderr, FMT, "-i <usbusX>", "Listen on USB bus interface"); 772 fprintf(stderr, FMT, "-f <unit[.endpoint]>", "Specify a device and endpoint filter"); 773 fprintf(stderr, FMT, "-r <file>", "Read the raw packets from file"); 774 fprintf(stderr, FMT, "-s <snaplen>", "Snapshot bytes from each packet"); 775 fprintf(stderr, FMT, "-v", "Increase the verbose level"); 776 fprintf(stderr, FMT, "-b <file>", "Save raw version of all recorded data to file"); 777 fprintf(stderr, FMT, "-w <file>", "Write the raw packets to file"); 778 fprintf(stderr, FMT, "-h", "Display summary of command line options"); 779 #undef FMT 780 exit(EX_USAGE); 781 } 782 783 static void 784 check_usb_pf_sysctl(void) 785 { 786 int error; 787 int no_pf_val = 0; 788 size_t no_pf_len = sizeof(int); 789 790 /* check "hw.usb.no_pf" sysctl for 8- and 9- stable */ 791 792 error = sysctlbyname("hw.usb.no_pf", &no_pf_val, 793 &no_pf_len, NULL, 0); 794 if (error == 0 && no_pf_val != 0) { 795 warnx("The USB packet filter might be disabled."); 796 warnx("See the \"hw.usb.no_pf\" sysctl for more information."); 797 } 798 } 799 800 int 801 main(int argc, char *argv[]) 802 { 803 struct timeval tv; 804 struct bpf_program total_prog; 805 struct bpf_stat us; 806 struct bpf_version bv; 807 struct usbcap *p = &uc; 808 struct ifreq ifr; 809 long snapshot = 192; 810 uint32_t v; 811 int fd; 812 int o; 813 int filt_unit; 814 int filt_ep; 815 int s; 816 int ifindex; 817 const char *optstring; 818 char *pp; 819 820 optstring = "b:hi:r:s:vw:f:"; 821 while ((o = getopt(argc, argv, optstring)) != -1) { 822 switch (o) { 823 case 'i': 824 i_arg = optarg; 825 break; 826 case 'r': 827 r_arg = optarg; 828 init_rfile(p); 829 break; 830 case 's': 831 snapshot = strtol(optarg, &pp, 10); 832 errno = 0; 833 if (pp != NULL && *pp != 0) 834 usage(); 835 if (snapshot == 0 && errno == EINVAL) 836 usage(); 837 /* snapeshot == 0 is special */ 838 if (snapshot == 0) 839 snapshot = -1; 840 break; 841 case 'b': 842 b_arg = optarg; 843 break; 844 case 'v': 845 verbose++; 846 break; 847 case 'w': 848 w_arg = optarg; 849 init_wfile(p); 850 break; 851 case 'f': 852 filt_unit = strtol(optarg, &pp, 10); 853 filt_ep = -1; 854 if (pp != NULL) { 855 if (*pp == '.') { 856 filt_ep = strtol(pp + 1, &pp, 10); 857 if (pp != NULL && *pp != 0) 858 usage(); 859 } else if (*pp != 0) { 860 usage(); 861 } 862 } 863 add_filter(filt_unit, filt_ep); 864 break; 865 default: 866 usage(); 867 /* NOTREACHED */ 868 } 869 } 870 871 if (b_arg != NULL) { 872 p->bfd = open(b_arg, O_CREAT | O_TRUNC | 873 O_WRONLY, S_IRUSR | S_IWUSR); 874 if (p->bfd < 0) { 875 err(EXIT_FAILURE, "Could not open " 876 "'%s' for write", b_arg); 877 } 878 } 879 880 /* 881 * Require more verbosity to print anything when -w or -b is 882 * specified on the command line: 883 */ 884 if (w_arg != NULL || b_arg != NULL) 885 verbose--; 886 887 if (r_arg != NULL) { 888 read_file(p); 889 exit(EXIT_SUCCESS); 890 } 891 892 check_usb_pf_sysctl(); 893 894 p->fd = fd = open("/dev/bpf", O_RDONLY); 895 if (p->fd < 0) 896 err(EXIT_FAILURE, "Could not open BPF device"); 897 898 if (ioctl(fd, BIOCVERSION, (caddr_t)&bv) < 0) 899 err(EXIT_FAILURE, "BIOCVERSION ioctl failed"); 900 901 if (bv.bv_major != BPF_MAJOR_VERSION || 902 bv.bv_minor < BPF_MINOR_VERSION) 903 errx(EXIT_FAILURE, "Kernel BPF filter out of date"); 904 905 /* USB transfers can be greater than 64KByte */ 906 v = 1U << 16; 907 908 /* clear ifr structure */ 909 memset(&ifr, 0, sizeof(ifr)); 910 911 /* Try to create usbusN interface if it is not available. */ 912 s = socket(AF_LOCAL, SOCK_DGRAM, 0); 913 if (s < 0) 914 errx(EXIT_FAILURE, "Could not open a socket"); 915 ifindex = if_nametoindex(i_arg); 916 if (ifindex == 0) { 917 (void)strlcpy(ifr.ifr_name, i_arg, sizeof(ifr.ifr_name)); 918 if (ioctl(s, SIOCIFCREATE2, &ifr) < 0) 919 errx(EXIT_FAILURE, "Invalid bus interface: %s", i_arg); 920 } 921 922 for ( ; v >= USBPF_HDR_LEN; v >>= 1) { 923 (void)ioctl(fd, BIOCSBLEN, (caddr_t)&v); 924 (void)strlcpy(ifr.ifr_name, i_arg, sizeof(ifr.ifr_name)); 925 if (ioctl(fd, BIOCSETIF, (caddr_t)&ifr) >= 0) 926 break; 927 } 928 if (v == 0) 929 errx(EXIT_FAILURE, "No buffer size worked."); 930 931 if (ioctl(fd, BIOCGBLEN, (caddr_t)&v) < 0) 932 err(EXIT_FAILURE, "BIOCGBLEN ioctl failed"); 933 934 p->bufsize = v; 935 p->buffer = (uint8_t *)malloc(p->bufsize); 936 if (p->buffer == NULL) 937 errx(EX_SOFTWARE, "Out of memory."); 938 939 make_filter(&total_prog, snapshot); 940 941 if (ioctl(p->fd, BIOCSETF, (caddr_t)&total_prog) < 0) 942 err(EXIT_FAILURE, "BIOCSETF ioctl failed"); 943 944 free_filter(&total_prog); 945 946 /* 1 second read timeout */ 947 tv.tv_sec = 1; 948 tv.tv_usec = 0; 949 if (ioctl(p->fd, BIOCSRTIMEOUT, (caddr_t)&tv) < 0) 950 err(EXIT_FAILURE, "BIOCSRTIMEOUT ioctl failed"); 951 952 (void)signal(SIGINT, handle_sigint); 953 954 do_loop(p); 955 956 if (ioctl(fd, BIOCGSTATS, (caddr_t)&us) < 0) 957 err(EXIT_FAILURE, "BIOCGSTATS ioctl failed"); 958 959 /* XXX what's difference between pkt_captured and us.us_recv? */ 960 printf("\n"); 961 printf("%d packets captured\n", pkt_captured); 962 printf("%d packets received by filter\n", us.bs_recv); 963 printf("%d packets dropped by kernel\n", us.bs_drop); 964 965 /* 966 * Destroy the usbusN interface only if it was created by 967 * usbdump(8). Ignore when it was already destroyed. 968 */ 969 if (ifindex == 0 && if_nametoindex(i_arg) > 0) { 970 (void)strlcpy(ifr.ifr_name, i_arg, sizeof(ifr.ifr_name)); 971 if (ioctl(s, SIOCIFDESTROY, &ifr) < 0) 972 warn("SIOCIFDESTROY ioctl failed"); 973 } 974 close(s); 975 976 if (p->fd > 0) 977 close(p->fd); 978 if (p->rfd > 0) 979 close(p->rfd); 980 if (p->wfd > 0) 981 close(p->wfd); 982 if (p->bfd > 0) 983 close(p->bfd); 984 985 return (EXIT_SUCCESS); 986 } 987