JP Abgrall | 511eca3 | 2014-02-12 13:46:45 -0800 | [diff] [blame] | 1 | /* |
| 2 | * Copyright (c) 2006 Paolo Abeni (Italy) |
| 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. |
Elliott Hughes | d8845d7 | 2015-10-19 18:07:04 -0700 | [diff] [blame^] | 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 |
JP Abgrall | 511eca3 | 2014-02-12 13:46:45 -0800 | [diff] [blame] | 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 | * USB sniffing API implementation for Linux platform |
| 31 | * By Paolo Abeni <paolo.abeni@email.it> |
| 32 | * Modifications: Kris Katterjohn <katterjohn@gmail.com> |
| 33 | * |
| 34 | */ |
Elliott Hughes | d8845d7 | 2015-10-19 18:07:04 -0700 | [diff] [blame^] | 35 | |
JP Abgrall | 511eca3 | 2014-02-12 13:46:45 -0800 | [diff] [blame] | 36 | #ifdef HAVE_CONFIG_H |
| 37 | #include "config.h" |
| 38 | #endif |
| 39 | |
| 40 | #include "pcap-int.h" |
| 41 | #include "pcap-usb-linux.h" |
| 42 | #include "pcap/usb.h" |
| 43 | |
| 44 | #ifdef NEED_STRERROR_H |
| 45 | #include "strerror.h" |
| 46 | #endif |
| 47 | |
| 48 | #include <ctype.h> |
| 49 | #include <errno.h> |
| 50 | #include <stdlib.h> |
| 51 | #include <unistd.h> |
| 52 | #include <fcntl.h> |
| 53 | #include <string.h> |
| 54 | #include <dirent.h> |
| 55 | #include <byteswap.h> |
| 56 | #include <netinet/in.h> |
| 57 | #include <sys/ioctl.h> |
| 58 | #include <sys/mman.h> |
| 59 | #ifdef HAVE_LINUX_USBDEVICE_FS_H |
| 60 | /* |
| 61 | * We might need <linux/compiler.h> to define __user for |
| 62 | * <linux/usbdevice_fs.h>. |
| 63 | */ |
| 64 | #ifdef HAVE_LINUX_COMPILER_H |
| 65 | #include <linux/compiler.h> |
| 66 | #endif /* HAVE_LINUX_COMPILER_H */ |
| 67 | #include <linux/usbdevice_fs.h> |
| 68 | #endif /* HAVE_LINUX_USBDEVICE_FS_H */ |
| 69 | |
| 70 | #define USB_IFACE "usbmon" |
| 71 | #define USB_TEXT_DIR_OLD "/sys/kernel/debug/usbmon" |
| 72 | #define USB_TEXT_DIR "/sys/kernel/debug/usb/usbmon" |
| 73 | #define SYS_USB_BUS_DIR "/sys/bus/usb/devices" |
| 74 | #define PROC_USB_BUS_DIR "/proc/bus/usb" |
| 75 | #define USB_LINE_LEN 4096 |
| 76 | |
| 77 | #if __BYTE_ORDER == __LITTLE_ENDIAN |
| 78 | #define htols(s) s |
| 79 | #define htoll(l) l |
| 80 | #define htol64(ll) ll |
| 81 | #else |
| 82 | #define htols(s) bswap_16(s) |
| 83 | #define htoll(l) bswap_32(l) |
| 84 | #define htol64(ll) bswap_64(ll) |
| 85 | #endif |
| 86 | |
| 87 | struct mon_bin_stats { |
| 88 | u_int32_t queued; |
| 89 | u_int32_t dropped; |
| 90 | }; |
| 91 | |
| 92 | struct mon_bin_get { |
| 93 | pcap_usb_header *hdr; |
| 94 | void *data; |
| 95 | size_t data_len; /* Length of data (can be zero) */ |
| 96 | }; |
| 97 | |
| 98 | struct mon_bin_mfetch { |
| 99 | int32_t *offvec; /* Vector of events fetched */ |
| 100 | int32_t nfetch; /* Number of events to fetch (out: fetched) */ |
| 101 | int32_t nflush; /* Number of events to flush */ |
| 102 | }; |
| 103 | |
| 104 | #define MON_IOC_MAGIC 0x92 |
| 105 | |
| 106 | #define MON_IOCQ_URB_LEN _IO(MON_IOC_MAGIC, 1) |
| 107 | #define MON_IOCX_URB _IOWR(MON_IOC_MAGIC, 2, struct mon_bin_hdr) |
| 108 | #define MON_IOCG_STATS _IOR(MON_IOC_MAGIC, 3, struct mon_bin_stats) |
| 109 | #define MON_IOCT_RING_SIZE _IO(MON_IOC_MAGIC, 4) |
| 110 | #define MON_IOCQ_RING_SIZE _IO(MON_IOC_MAGIC, 5) |
| 111 | #define MON_IOCX_GET _IOW(MON_IOC_MAGIC, 6, struct mon_bin_get) |
| 112 | #define MON_IOCX_MFETCH _IOWR(MON_IOC_MAGIC, 7, struct mon_bin_mfetch) |
| 113 | #define MON_IOCH_MFLUSH _IO(MON_IOC_MAGIC, 8) |
| 114 | |
| 115 | #define MON_BIN_SETUP 0x1 /* setup hdr is present*/ |
| 116 | #define MON_BIN_SETUP_ZERO 0x2 /* setup buffer is not available */ |
| 117 | #define MON_BIN_DATA_ZERO 0x4 /* data buffer is not available */ |
| 118 | #define MON_BIN_ERROR 0x8 |
| 119 | |
| 120 | /* |
| 121 | * Private data for capturing on Linux USB. |
| 122 | */ |
| 123 | struct pcap_usb_linux { |
| 124 | u_char *mmapbuf; /* memory-mapped region pointer */ |
| 125 | size_t mmapbuflen; /* size of region */ |
| 126 | int bus_index; |
| 127 | u_int packets_read; |
| 128 | }; |
| 129 | |
| 130 | /* forward declaration */ |
| 131 | static int usb_activate(pcap_t *); |
| 132 | static int usb_stats_linux(pcap_t *, struct pcap_stat *); |
| 133 | static int usb_stats_linux_bin(pcap_t *, struct pcap_stat *); |
| 134 | static int usb_read_linux(pcap_t *, int , pcap_handler , u_char *); |
| 135 | static int usb_read_linux_bin(pcap_t *, int , pcap_handler , u_char *); |
| 136 | static int usb_read_linux_mmap(pcap_t *, int , pcap_handler , u_char *); |
| 137 | static int usb_inject_linux(pcap_t *, const void *, size_t); |
| 138 | static int usb_setdirection_linux(pcap_t *, pcap_direction_t); |
| 139 | static void usb_cleanup_linux_mmap(pcap_t *); |
| 140 | |
| 141 | /* facility to add an USB device to the device list*/ |
Elliott Hughes | d8845d7 | 2015-10-19 18:07:04 -0700 | [diff] [blame^] | 142 | static int |
JP Abgrall | 511eca3 | 2014-02-12 13:46:45 -0800 | [diff] [blame] | 143 | usb_dev_add(pcap_if_t** alldevsp, int n, char *err_str) |
| 144 | { |
| 145 | char dev_name[10]; |
Elliott Hughes | d8845d7 | 2015-10-19 18:07:04 -0700 | [diff] [blame^] | 146 | char dev_descr[30]; |
JP Abgrall | 511eca3 | 2014-02-12 13:46:45 -0800 | [diff] [blame] | 147 | snprintf(dev_name, 10, USB_IFACE"%d", n); |
| 148 | snprintf(dev_descr, 30, "USB bus number %d", n); |
| 149 | |
Elliott Hughes | d8845d7 | 2015-10-19 18:07:04 -0700 | [diff] [blame^] | 150 | if (pcap_add_if(alldevsp, dev_name, 0, |
JP Abgrall | 511eca3 | 2014-02-12 13:46:45 -0800 | [diff] [blame] | 151 | dev_descr, err_str) < 0) |
| 152 | return -1; |
Elliott Hughes | d8845d7 | 2015-10-19 18:07:04 -0700 | [diff] [blame^] | 153 | return 0; |
JP Abgrall | 511eca3 | 2014-02-12 13:46:45 -0800 | [diff] [blame] | 154 | } |
| 155 | |
Elliott Hughes | d8845d7 | 2015-10-19 18:07:04 -0700 | [diff] [blame^] | 156 | int |
JP Abgrall | 511eca3 | 2014-02-12 13:46:45 -0800 | [diff] [blame] | 157 | usb_findalldevs(pcap_if_t **alldevsp, char *err_str) |
| 158 | { |
| 159 | struct dirent* data; |
| 160 | int ret = 0; |
| 161 | DIR* dir; |
| 162 | int n; |
| 163 | char* name; |
| 164 | size_t len; |
| 165 | |
| 166 | /* try scanning sysfs usb bus directory */ |
| 167 | dir = opendir(SYS_USB_BUS_DIR); |
| 168 | if (dir != NULL) { |
| 169 | while ((ret == 0) && ((data = readdir(dir)) != 0)) { |
| 170 | name = data->d_name; |
| 171 | |
| 172 | if (strncmp(name, "usb", 3) != 0) |
| 173 | continue; |
| 174 | |
Elliott Hughes | d8845d7 | 2015-10-19 18:07:04 -0700 | [diff] [blame^] | 175 | if (sscanf(&name[3], "%d", &n) == 0) |
JP Abgrall | 511eca3 | 2014-02-12 13:46:45 -0800 | [diff] [blame] | 176 | continue; |
| 177 | |
| 178 | ret = usb_dev_add(alldevsp, n, err_str); |
| 179 | } |
| 180 | |
| 181 | closedir(dir); |
| 182 | return ret; |
| 183 | } |
| 184 | |
| 185 | /* that didn't work; try scanning procfs usb bus directory */ |
| 186 | dir = opendir(PROC_USB_BUS_DIR); |
| 187 | if (dir != NULL) { |
| 188 | while ((ret == 0) && ((data = readdir(dir)) != 0)) { |
| 189 | name = data->d_name; |
| 190 | len = strlen(name); |
| 191 | |
| 192 | /* if this file name does not end with a number it's not of our interest */ |
| 193 | if ((len < 1) || !isdigit(name[--len])) |
| 194 | continue; |
| 195 | while (isdigit(name[--len])); |
Elliott Hughes | d8845d7 | 2015-10-19 18:07:04 -0700 | [diff] [blame^] | 196 | if (sscanf(&name[len+1], "%d", &n) != 1) |
JP Abgrall | 511eca3 | 2014-02-12 13:46:45 -0800 | [diff] [blame] | 197 | continue; |
| 198 | |
| 199 | ret = usb_dev_add(alldevsp, n, err_str); |
| 200 | } |
| 201 | |
| 202 | closedir(dir); |
| 203 | return ret; |
| 204 | } |
| 205 | |
| 206 | /* neither of them worked */ |
| 207 | return 0; |
| 208 | } |
| 209 | |
Elliott Hughes | d8845d7 | 2015-10-19 18:07:04 -0700 | [diff] [blame^] | 210 | static |
JP Abgrall | 511eca3 | 2014-02-12 13:46:45 -0800 | [diff] [blame] | 211 | int usb_mmap(pcap_t* handle) |
| 212 | { |
| 213 | struct pcap_usb_linux *handlep = handle->priv; |
| 214 | int len = ioctl(handle->fd, MON_IOCQ_RING_SIZE); |
Elliott Hughes | d8845d7 | 2015-10-19 18:07:04 -0700 | [diff] [blame^] | 215 | if (len < 0) |
JP Abgrall | 511eca3 | 2014-02-12 13:46:45 -0800 | [diff] [blame] | 216 | return 0; |
| 217 | |
| 218 | handlep->mmapbuflen = len; |
| 219 | handlep->mmapbuf = mmap(0, handlep->mmapbuflen, PROT_READ, |
| 220 | MAP_SHARED, handle->fd, 0); |
| 221 | return handlep->mmapbuf != MAP_FAILED; |
| 222 | } |
| 223 | |
Elliott Hughes | d8845d7 | 2015-10-19 18:07:04 -0700 | [diff] [blame^] | 224 | #ifdef HAVE_LINUX_USBDEVICE_FS_H |
| 225 | |
JP Abgrall | 511eca3 | 2014-02-12 13:46:45 -0800 | [diff] [blame] | 226 | #define CTRL_TIMEOUT (5*1000) /* milliseconds */ |
| 227 | |
| 228 | #define USB_DIR_IN 0x80 |
| 229 | #define USB_TYPE_STANDARD 0x00 |
| 230 | #define USB_RECIP_DEVICE 0x00 |
| 231 | |
| 232 | #define USB_REQ_GET_DESCRIPTOR 6 |
| 233 | |
| 234 | #define USB_DT_DEVICE 1 |
| 235 | |
| 236 | /* probe the descriptors of the devices attached to the bus */ |
| 237 | /* the descriptors will end up in the captured packet stream */ |
| 238 | /* and be decoded by external apps like wireshark */ |
| 239 | /* without these identifying probes packet data can't be fully decoded */ |
| 240 | static void |
| 241 | probe_devices(int bus) |
| 242 | { |
| 243 | struct usbdevfs_ctrltransfer ctrl; |
| 244 | struct dirent* data; |
| 245 | int ret = 0; |
| 246 | char buf[40]; |
| 247 | DIR* dir; |
| 248 | |
| 249 | /* scan usb bus directories for device nodes */ |
| 250 | snprintf(buf, sizeof(buf), "/dev/bus/usb/%03d", bus); |
| 251 | dir = opendir(buf); |
| 252 | if (!dir) |
| 253 | return; |
| 254 | |
| 255 | while ((ret >= 0) && ((data = readdir(dir)) != 0)) { |
| 256 | int fd; |
| 257 | char* name = data->d_name; |
| 258 | |
| 259 | if (name[0] == '.') |
| 260 | continue; |
| 261 | |
| 262 | snprintf(buf, sizeof(buf), "/dev/bus/usb/%03d/%s", bus, data->d_name); |
Elliott Hughes | d8845d7 | 2015-10-19 18:07:04 -0700 | [diff] [blame^] | 263 | |
JP Abgrall | 511eca3 | 2014-02-12 13:46:45 -0800 | [diff] [blame] | 264 | fd = open(buf, O_RDWR); |
| 265 | if (fd == -1) |
| 266 | continue; |
| 267 | |
| 268 | /* |
| 269 | * Sigh. Different kernels have different member names |
| 270 | * for this structure. |
| 271 | */ |
| 272 | #ifdef HAVE_USBDEVFS_CTRLTRANSFER_BREQUESTTYPE |
| 273 | ctrl.bRequestType = USB_DIR_IN | USB_TYPE_STANDARD | USB_RECIP_DEVICE; |
| 274 | ctrl.bRequest = USB_REQ_GET_DESCRIPTOR; |
| 275 | ctrl.wValue = USB_DT_DEVICE << 8; |
| 276 | ctrl.wIndex = 0; |
| 277 | ctrl.wLength = sizeof(buf); |
| 278 | #else |
| 279 | ctrl.requesttype = USB_DIR_IN | USB_TYPE_STANDARD | USB_RECIP_DEVICE; |
| 280 | ctrl.request = USB_REQ_GET_DESCRIPTOR; |
| 281 | ctrl.value = USB_DT_DEVICE << 8; |
| 282 | ctrl.index = 0; |
| 283 | ctrl.length = sizeof(buf); |
| 284 | #endif |
| 285 | ctrl.data = buf; |
| 286 | ctrl.timeout = CTRL_TIMEOUT; |
| 287 | |
| 288 | ret = ioctl(fd, USBDEVFS_CONTROL, &ctrl); |
| 289 | |
| 290 | close(fd); |
| 291 | } |
| 292 | closedir(dir); |
| 293 | } |
Elliott Hughes | d8845d7 | 2015-10-19 18:07:04 -0700 | [diff] [blame^] | 294 | #endif /* HAVE_LINUX_USBDEVICE_FS_H */ |
JP Abgrall | 511eca3 | 2014-02-12 13:46:45 -0800 | [diff] [blame] | 295 | |
| 296 | pcap_t * |
| 297 | usb_create(const char *device, char *ebuf, int *is_ours) |
| 298 | { |
| 299 | const char *cp; |
| 300 | char *cpend; |
| 301 | long devnum; |
| 302 | pcap_t *p; |
| 303 | |
| 304 | /* Does this look like a USB monitoring device? */ |
| 305 | cp = strrchr(device, '/'); |
| 306 | if (cp == NULL) |
| 307 | cp = device; |
| 308 | /* Does it begin with USB_IFACE? */ |
| 309 | if (strncmp(cp, USB_IFACE, sizeof USB_IFACE - 1) != 0) { |
| 310 | /* Nope, doesn't begin with USB_IFACE */ |
| 311 | *is_ours = 0; |
| 312 | return NULL; |
| 313 | } |
| 314 | /* Yes - is USB_IFACE followed by a number? */ |
| 315 | cp += sizeof USB_IFACE - 1; |
| 316 | devnum = strtol(cp, &cpend, 10); |
| 317 | if (cpend == cp || *cpend != '\0') { |
| 318 | /* Not followed by a number. */ |
| 319 | *is_ours = 0; |
| 320 | return NULL; |
| 321 | } |
| 322 | if (devnum < 0) { |
| 323 | /* Followed by a non-valid number. */ |
| 324 | *is_ours = 0; |
| 325 | return NULL; |
| 326 | } |
| 327 | |
| 328 | /* OK, it's probably ours. */ |
| 329 | *is_ours = 1; |
| 330 | |
| 331 | p = pcap_create_common(device, ebuf, sizeof (struct pcap_usb_linux)); |
| 332 | if (p == NULL) |
| 333 | return (NULL); |
| 334 | |
| 335 | p->activate_op = usb_activate; |
| 336 | return (p); |
| 337 | } |
| 338 | |
| 339 | static int |
| 340 | usb_activate(pcap_t* handle) |
| 341 | { |
| 342 | struct pcap_usb_linux *handlep = handle->priv; |
| 343 | char full_path[USB_LINE_LEN]; |
| 344 | |
| 345 | /* Initialize some components of the pcap structure. */ |
| 346 | handle->bufsize = handle->snapshot; |
| 347 | handle->offset = 0; |
| 348 | handle->linktype = DLT_USB_LINUX; |
| 349 | |
| 350 | handle->inject_op = usb_inject_linux; |
| 351 | handle->setfilter_op = install_bpf_program; /* no kernel filtering */ |
| 352 | handle->setdirection_op = usb_setdirection_linux; |
| 353 | handle->set_datalink_op = NULL; /* can't change data link type */ |
| 354 | handle->getnonblock_op = pcap_getnonblock_fd; |
| 355 | handle->setnonblock_op = pcap_setnonblock_fd; |
| 356 | |
| 357 | /*get usb bus index from device name */ |
| 358 | if (sscanf(handle->opt.source, USB_IFACE"%d", &handlep->bus_index) != 1) |
| 359 | { |
| 360 | snprintf(handle->errbuf, PCAP_ERRBUF_SIZE, |
| 361 | "Can't get USB bus index from %s", handle->opt.source); |
| 362 | return PCAP_ERROR; |
| 363 | } |
| 364 | |
| 365 | /*now select the read method: try to open binary interface */ |
Elliott Hughes | d8845d7 | 2015-10-19 18:07:04 -0700 | [diff] [blame^] | 366 | snprintf(full_path, USB_LINE_LEN, LINUX_USB_MON_DEV"%d", handlep->bus_index); |
JP Abgrall | 511eca3 | 2014-02-12 13:46:45 -0800 | [diff] [blame] | 367 | handle->fd = open(full_path, O_RDONLY, 0); |
| 368 | if (handle->fd >= 0) |
| 369 | { |
| 370 | if (handle->opt.rfmon) { |
| 371 | /* |
| 372 | * Monitor mode doesn't apply to USB devices. |
| 373 | */ |
| 374 | close(handle->fd); |
| 375 | return PCAP_ERROR_RFMON_NOTSUP; |
| 376 | } |
| 377 | |
| 378 | /* binary api is available, try to use fast mmap access */ |
| 379 | if (usb_mmap(handle)) { |
| 380 | handle->linktype = DLT_USB_LINUX_MMAPPED; |
| 381 | handle->stats_op = usb_stats_linux_bin; |
| 382 | handle->read_op = usb_read_linux_mmap; |
| 383 | handle->cleanup_op = usb_cleanup_linux_mmap; |
Elliott Hughes | d8845d7 | 2015-10-19 18:07:04 -0700 | [diff] [blame^] | 384 | #ifdef HAVE_LINUX_USBDEVICE_FS_H |
JP Abgrall | 511eca3 | 2014-02-12 13:46:45 -0800 | [diff] [blame] | 385 | probe_devices(handlep->bus_index); |
Elliott Hughes | d8845d7 | 2015-10-19 18:07:04 -0700 | [diff] [blame^] | 386 | #endif |
JP Abgrall | 511eca3 | 2014-02-12 13:46:45 -0800 | [diff] [blame] | 387 | |
| 388 | /* |
| 389 | * "handle->fd" is a real file, so "select()" and |
| 390 | * "poll()" work on it. |
| 391 | */ |
| 392 | handle->selectable_fd = handle->fd; |
| 393 | return 0; |
| 394 | } |
| 395 | |
| 396 | /* can't mmap, use plain binary interface access */ |
| 397 | handle->stats_op = usb_stats_linux_bin; |
| 398 | handle->read_op = usb_read_linux_bin; |
Elliott Hughes | d8845d7 | 2015-10-19 18:07:04 -0700 | [diff] [blame^] | 399 | #ifdef HAVE_LINUX_USBDEVICE_FS_H |
JP Abgrall | 511eca3 | 2014-02-12 13:46:45 -0800 | [diff] [blame] | 400 | probe_devices(handlep->bus_index); |
Elliott Hughes | d8845d7 | 2015-10-19 18:07:04 -0700 | [diff] [blame^] | 401 | #endif |
JP Abgrall | 511eca3 | 2014-02-12 13:46:45 -0800 | [diff] [blame] | 402 | } |
| 403 | else { |
| 404 | /*Binary interface not available, try open text interface */ |
Elliott Hughes | d8845d7 | 2015-10-19 18:07:04 -0700 | [diff] [blame^] | 405 | snprintf(full_path, USB_LINE_LEN, USB_TEXT_DIR"/%dt", handlep->bus_index); |
JP Abgrall | 511eca3 | 2014-02-12 13:46:45 -0800 | [diff] [blame] | 406 | handle->fd = open(full_path, O_RDONLY, 0); |
| 407 | if (handle->fd < 0) |
| 408 | { |
| 409 | if (errno == ENOENT) |
| 410 | { |
| 411 | /* |
| 412 | * Not found at the new location; try |
| 413 | * the old location. |
| 414 | */ |
Elliott Hughes | d8845d7 | 2015-10-19 18:07:04 -0700 | [diff] [blame^] | 415 | snprintf(full_path, USB_LINE_LEN, USB_TEXT_DIR_OLD"/%dt", handlep->bus_index); |
JP Abgrall | 511eca3 | 2014-02-12 13:46:45 -0800 | [diff] [blame] | 416 | handle->fd = open(full_path, O_RDONLY, 0); |
| 417 | } |
| 418 | if (handle->fd < 0) { |
| 419 | /* no more fallback, give it up*/ |
| 420 | snprintf(handle->errbuf, PCAP_ERRBUF_SIZE, |
| 421 | "Can't open USB bus file %s: %s", full_path, strerror(errno)); |
| 422 | return PCAP_ERROR; |
| 423 | } |
| 424 | } |
| 425 | |
| 426 | if (handle->opt.rfmon) { |
| 427 | /* |
| 428 | * Monitor mode doesn't apply to USB devices. |
| 429 | */ |
| 430 | close(handle->fd); |
| 431 | return PCAP_ERROR_RFMON_NOTSUP; |
| 432 | } |
| 433 | |
| 434 | handle->stats_op = usb_stats_linux; |
| 435 | handle->read_op = usb_read_linux; |
| 436 | } |
| 437 | |
| 438 | /* |
| 439 | * "handle->fd" is a real file, so "select()" and "poll()" |
| 440 | * work on it. |
| 441 | */ |
| 442 | handle->selectable_fd = handle->fd; |
| 443 | |
| 444 | /* for plain binary access and text access we need to allocate the read |
| 445 | * buffer */ |
| 446 | handle->buffer = malloc(handle->bufsize); |
| 447 | if (!handle->buffer) { |
| 448 | snprintf(handle->errbuf, PCAP_ERRBUF_SIZE, |
| 449 | "malloc: %s", pcap_strerror(errno)); |
| 450 | close(handle->fd); |
| 451 | return PCAP_ERROR; |
| 452 | } |
| 453 | return 0; |
| 454 | } |
| 455 | |
Elliott Hughes | d8845d7 | 2015-10-19 18:07:04 -0700 | [diff] [blame^] | 456 | static inline int |
JP Abgrall | 511eca3 | 2014-02-12 13:46:45 -0800 | [diff] [blame] | 457 | ascii_to_int(char c) |
| 458 | { |
| 459 | return c < 'A' ? c- '0': ((c<'a') ? c - 'A' + 10: c-'a'+10); |
| 460 | } |
| 461 | |
| 462 | /* |
Elliott Hughes | d8845d7 | 2015-10-19 18:07:04 -0700 | [diff] [blame^] | 463 | * see <linux-kernel-source>/Documentation/usb/usbmon.txt and |
| 464 | * <linux-kernel-source>/drivers/usb/mon/mon_text.c for urb string |
JP Abgrall | 511eca3 | 2014-02-12 13:46:45 -0800 | [diff] [blame] | 465 | * format description |
| 466 | */ |
| 467 | static int |
| 468 | usb_read_linux(pcap_t *handle, int max_packets, pcap_handler callback, u_char *user) |
| 469 | { |
| 470 | /* see: |
Elliott Hughes | d8845d7 | 2015-10-19 18:07:04 -0700 | [diff] [blame^] | 471 | * /usr/src/linux/Documentation/usb/usbmon.txt |
JP Abgrall | 511eca3 | 2014-02-12 13:46:45 -0800 | [diff] [blame] | 472 | * for message format |
| 473 | */ |
| 474 | struct pcap_usb_linux *handlep = handle->priv; |
| 475 | unsigned timestamp; |
| 476 | int tag, cnt, ep_num, dev_addr, dummy, ret, urb_len, data_len; |
| 477 | char etype, pipeid1, pipeid2, status[16], urb_tag, line[USB_LINE_LEN]; |
| 478 | char *string = line; |
| 479 | u_char * rawdata = handle->buffer; |
| 480 | struct pcap_pkthdr pkth; |
| 481 | pcap_usb_header* uhdr = (pcap_usb_header*)handle->buffer; |
| 482 | u_char urb_transfer=0; |
| 483 | int incoming=0; |
| 484 | |
| 485 | /* ignore interrupt system call errors */ |
| 486 | do { |
| 487 | ret = read(handle->fd, line, USB_LINE_LEN - 1); |
| 488 | if (handle->break_loop) |
| 489 | { |
| 490 | handle->break_loop = 0; |
| 491 | return -2; |
| 492 | } |
| 493 | } while ((ret == -1) && (errno == EINTR)); |
| 494 | if (ret < 0) |
| 495 | { |
| 496 | if (errno == EAGAIN) |
| 497 | return 0; /* no data there */ |
| 498 | |
| 499 | snprintf(handle->errbuf, PCAP_ERRBUF_SIZE, |
| 500 | "Can't read from fd %d: %s", handle->fd, strerror(errno)); |
| 501 | return -1; |
| 502 | } |
| 503 | |
Elliott Hughes | d8845d7 | 2015-10-19 18:07:04 -0700 | [diff] [blame^] | 504 | /* read urb header; %n argument may increment return value, but it's |
JP Abgrall | 511eca3 | 2014-02-12 13:46:45 -0800 | [diff] [blame] | 505 | * not mandatory, so does not count on it*/ |
| 506 | string[ret] = 0; |
Elliott Hughes | d8845d7 | 2015-10-19 18:07:04 -0700 | [diff] [blame^] | 507 | ret = sscanf(string, "%x %d %c %c%c:%d:%d %s%n", &tag, ×tamp, &etype, |
| 508 | &pipeid1, &pipeid2, &dev_addr, &ep_num, status, |
JP Abgrall | 511eca3 | 2014-02-12 13:46:45 -0800 | [diff] [blame] | 509 | &cnt); |
| 510 | if (ret < 8) |
| 511 | { |
| 512 | snprintf(handle->errbuf, PCAP_ERRBUF_SIZE, |
| 513 | "Can't parse USB bus message '%s', too few tokens (expected 8 got %d)", |
| 514 | string, ret); |
| 515 | return -1; |
| 516 | } |
| 517 | uhdr->id = tag; |
| 518 | uhdr->device_address = dev_addr; |
| 519 | uhdr->bus_id = handlep->bus_index; |
| 520 | uhdr->status = 0; |
| 521 | string += cnt; |
| 522 | |
| 523 | /* don't use usbmon provided timestamp, since it have low precision*/ |
Elliott Hughes | d8845d7 | 2015-10-19 18:07:04 -0700 | [diff] [blame^] | 524 | if (gettimeofday(&pkth.ts, NULL) < 0) |
JP Abgrall | 511eca3 | 2014-02-12 13:46:45 -0800 | [diff] [blame] | 525 | { |
| 526 | snprintf(handle->errbuf, PCAP_ERRBUF_SIZE, |
Elliott Hughes | d8845d7 | 2015-10-19 18:07:04 -0700 | [diff] [blame^] | 527 | "Can't get timestamp for message '%s' %d:%s", |
JP Abgrall | 511eca3 | 2014-02-12 13:46:45 -0800 | [diff] [blame] | 528 | string, errno, strerror(errno)); |
| 529 | return -1; |
| 530 | } |
| 531 | uhdr->ts_sec = pkth.ts.tv_sec; |
| 532 | uhdr->ts_usec = pkth.ts.tv_usec; |
| 533 | |
| 534 | /* parse endpoint information */ |
| 535 | if (pipeid1 == 'C') |
| 536 | urb_transfer = URB_CONTROL; |
| 537 | else if (pipeid1 == 'Z') |
| 538 | urb_transfer = URB_ISOCHRONOUS; |
| 539 | else if (pipeid1 == 'I') |
| 540 | urb_transfer = URB_INTERRUPT; |
| 541 | else if (pipeid1 == 'B') |
| 542 | urb_transfer = URB_BULK; |
| 543 | if (pipeid2 == 'i') { |
| 544 | ep_num |= URB_TRANSFER_IN; |
| 545 | incoming = 1; |
| 546 | } |
| 547 | if (etype == 'C') |
| 548 | incoming = !incoming; |
| 549 | |
| 550 | /* direction check*/ |
| 551 | if (incoming) |
| 552 | { |
| 553 | if (handle->direction == PCAP_D_OUT) |
| 554 | return 0; |
| 555 | } |
| 556 | else |
| 557 | if (handle->direction == PCAP_D_IN) |
| 558 | return 0; |
| 559 | uhdr->event_type = etype; |
| 560 | uhdr->transfer_type = urb_transfer; |
| 561 | uhdr->endpoint_number = ep_num; |
| 562 | pkth.caplen = sizeof(pcap_usb_header); |
| 563 | rawdata += sizeof(pcap_usb_header); |
| 564 | |
| 565 | /* check if this is a setup packet */ |
| 566 | ret = sscanf(status, "%d", &dummy); |
| 567 | if (ret != 1) |
| 568 | { |
| 569 | /* this a setup packet, setup data can be filled with underscore if |
Elliott Hughes | d8845d7 | 2015-10-19 18:07:04 -0700 | [diff] [blame^] | 570 | * usbmon has not been able to read them, so we must parse this fields as |
JP Abgrall | 511eca3 | 2014-02-12 13:46:45 -0800 | [diff] [blame] | 571 | * strings */ |
| 572 | pcap_usb_setup* shdr; |
| 573 | char str1[3], str2[3], str3[5], str4[5], str5[5]; |
Elliott Hughes | d8845d7 | 2015-10-19 18:07:04 -0700 | [diff] [blame^] | 574 | ret = sscanf(string, "%s %s %s %s %s%n", str1, str2, str3, str4, |
JP Abgrall | 511eca3 | 2014-02-12 13:46:45 -0800 | [diff] [blame] | 575 | str5, &cnt); |
| 576 | if (ret < 5) |
| 577 | { |
| 578 | snprintf(handle->errbuf, PCAP_ERRBUF_SIZE, |
| 579 | "Can't parse USB bus message '%s', too few tokens (expected 5 got %d)", |
| 580 | string, ret); |
| 581 | return -1; |
| 582 | } |
| 583 | string += cnt; |
| 584 | |
| 585 | /* try to convert to corresponding integer */ |
| 586 | shdr = &uhdr->setup; |
| 587 | shdr->bmRequestType = strtoul(str1, 0, 16); |
| 588 | shdr->bRequest = strtoul(str2, 0, 16); |
| 589 | shdr->wValue = htols(strtoul(str3, 0, 16)); |
| 590 | shdr->wIndex = htols(strtoul(str4, 0, 16)); |
| 591 | shdr->wLength = htols(strtoul(str5, 0, 16)); |
| 592 | |
| 593 | uhdr->setup_flag = 0; |
| 594 | } |
Elliott Hughes | d8845d7 | 2015-10-19 18:07:04 -0700 | [diff] [blame^] | 595 | else |
JP Abgrall | 511eca3 | 2014-02-12 13:46:45 -0800 | [diff] [blame] | 596 | uhdr->setup_flag = 1; |
| 597 | |
| 598 | /* read urb data */ |
| 599 | ret = sscanf(string, " %d%n", &urb_len, &cnt); |
| 600 | if (ret < 1) |
| 601 | { |
| 602 | snprintf(handle->errbuf, PCAP_ERRBUF_SIZE, |
| 603 | "Can't parse urb length from '%s'", string); |
| 604 | return -1; |
| 605 | } |
| 606 | string += cnt; |
| 607 | |
Elliott Hughes | d8845d7 | 2015-10-19 18:07:04 -0700 | [diff] [blame^] | 608 | /* urb tag is not present if urb length is 0, so we can stop here |
JP Abgrall | 511eca3 | 2014-02-12 13:46:45 -0800 | [diff] [blame] | 609 | * text parsing */ |
| 610 | pkth.len = urb_len+pkth.caplen; |
| 611 | uhdr->urb_len = urb_len; |
| 612 | uhdr->data_flag = 1; |
| 613 | data_len = 0; |
| 614 | if (uhdr->urb_len == 0) |
| 615 | goto got; |
| 616 | |
| 617 | /* check for data presence; data is present if and only if urb tag is '=' */ |
| 618 | if (sscanf(string, " %c", &urb_tag) != 1) |
| 619 | { |
| 620 | snprintf(handle->errbuf, PCAP_ERRBUF_SIZE, |
| 621 | "Can't parse urb tag from '%s'", string); |
| 622 | return -1; |
| 623 | } |
| 624 | |
Elliott Hughes | d8845d7 | 2015-10-19 18:07:04 -0700 | [diff] [blame^] | 625 | if (urb_tag != '=') |
JP Abgrall | 511eca3 | 2014-02-12 13:46:45 -0800 | [diff] [blame] | 626 | goto got; |
| 627 | |
| 628 | /* skip urb tag and following space */ |
| 629 | string += 3; |
| 630 | |
| 631 | /* if we reach this point we got some urb data*/ |
| 632 | uhdr->data_flag = 0; |
| 633 | |
Elliott Hughes | d8845d7 | 2015-10-19 18:07:04 -0700 | [diff] [blame^] | 634 | /* read all urb data; if urb length is greater then the usbmon internal |
JP Abgrall | 511eca3 | 2014-02-12 13:46:45 -0800 | [diff] [blame] | 635 | * buffer length used by the kernel to spool the URB, we get only |
| 636 | * a partial information. |
| 637 | * At least until linux 2.6.17 there is no way to set usbmon intenal buffer |
| 638 | * length and default value is 130. */ |
| 639 | while ((string[0] != 0) && (string[1] != 0) && (pkth.caplen < handle->snapshot)) |
| 640 | { |
| 641 | rawdata[0] = ascii_to_int(string[0]) * 16 + ascii_to_int(string[1]); |
| 642 | rawdata++; |
| 643 | string+=2; |
| 644 | if (string[0] == ' ') |
| 645 | string++; |
| 646 | pkth.caplen++; |
| 647 | data_len++; |
| 648 | } |
| 649 | |
| 650 | got: |
| 651 | uhdr->data_len = data_len; |
| 652 | if (pkth.caplen > handle->snapshot) |
| 653 | pkth.caplen = handle->snapshot; |
| 654 | |
| 655 | if (handle->fcode.bf_insns == NULL || |
| 656 | bpf_filter(handle->fcode.bf_insns, handle->buffer, |
| 657 | pkth.len, pkth.caplen)) { |
| 658 | handlep->packets_read++; |
| 659 | callback(user, &pkth, handle->buffer); |
| 660 | return 1; |
| 661 | } |
| 662 | return 0; /* didn't pass filter */ |
| 663 | } |
| 664 | |
| 665 | static int |
| 666 | usb_inject_linux(pcap_t *handle, const void *buf, size_t size) |
| 667 | { |
| 668 | snprintf(handle->errbuf, PCAP_ERRBUF_SIZE, "inject not supported on " |
| 669 | "USB devices"); |
| 670 | return (-1); |
| 671 | } |
| 672 | |
Elliott Hughes | d8845d7 | 2015-10-19 18:07:04 -0700 | [diff] [blame^] | 673 | static int |
JP Abgrall | 511eca3 | 2014-02-12 13:46:45 -0800 | [diff] [blame] | 674 | usb_stats_linux(pcap_t *handle, struct pcap_stat *stats) |
| 675 | { |
| 676 | struct pcap_usb_linux *handlep = handle->priv; |
| 677 | int dummy, ret, consumed, cnt; |
| 678 | char string[USB_LINE_LEN]; |
| 679 | char token[USB_LINE_LEN]; |
| 680 | char * ptr = string; |
| 681 | int fd; |
| 682 | |
| 683 | snprintf(string, USB_LINE_LEN, USB_TEXT_DIR"/%ds", handlep->bus_index); |
| 684 | fd = open(string, O_RDONLY, 0); |
| 685 | if (fd < 0) |
| 686 | { |
| 687 | if (errno == ENOENT) |
| 688 | { |
| 689 | /* |
| 690 | * Not found at the new location; try the old |
| 691 | * location. |
| 692 | */ |
| 693 | snprintf(string, USB_LINE_LEN, USB_TEXT_DIR_OLD"/%ds", handlep->bus_index); |
| 694 | fd = open(string, O_RDONLY, 0); |
| 695 | } |
| 696 | if (fd < 0) { |
| 697 | snprintf(handle->errbuf, PCAP_ERRBUF_SIZE, |
Elliott Hughes | d8845d7 | 2015-10-19 18:07:04 -0700 | [diff] [blame^] | 698 | "Can't open USB stats file %s: %s", |
JP Abgrall | 511eca3 | 2014-02-12 13:46:45 -0800 | [diff] [blame] | 699 | string, strerror(errno)); |
| 700 | return -1; |
| 701 | } |
| 702 | } |
| 703 | |
| 704 | /* read stats line */ |
| 705 | do { |
| 706 | ret = read(fd, string, USB_LINE_LEN-1); |
| 707 | } while ((ret == -1) && (errno == EINTR)); |
| 708 | close(fd); |
| 709 | |
| 710 | if (ret < 0) |
| 711 | { |
| 712 | snprintf(handle->errbuf, PCAP_ERRBUF_SIZE, |
| 713 | "Can't read stats from fd %d ", fd); |
| 714 | return -1; |
| 715 | } |
| 716 | string[ret] = 0; |
| 717 | |
| 718 | /* extract info on dropped urbs */ |
| 719 | for (consumed=0; consumed < ret; ) { |
Elliott Hughes | d8845d7 | 2015-10-19 18:07:04 -0700 | [diff] [blame^] | 720 | /* from the sscanf man page: |
| 721 | * The C standard says: "Execution of a %n directive does |
JP Abgrall | 511eca3 | 2014-02-12 13:46:45 -0800 | [diff] [blame] | 722 | * not increment the assignment count returned at the completion |
| 723 | * of execution" but the Corrigendum seems to contradict this. |
Elliott Hughes | d8845d7 | 2015-10-19 18:07:04 -0700 | [diff] [blame^] | 724 | * Do not make any assumptions on the effect of %n conversions |
JP Abgrall | 511eca3 | 2014-02-12 13:46:45 -0800 | [diff] [blame] | 725 | * on the return value and explicitly check for cnt assignmet*/ |
| 726 | int ntok; |
| 727 | |
| 728 | cnt = -1; |
| 729 | ntok = sscanf(ptr, "%s%n", token, &cnt); |
| 730 | if ((ntok < 1) || (cnt < 0)) |
| 731 | break; |
| 732 | consumed += cnt; |
| 733 | ptr += cnt; |
| 734 | if (strcmp(token, "nreaders") == 0) |
| 735 | ret = sscanf(ptr, "%d", &stats->ps_drop); |
Elliott Hughes | d8845d7 | 2015-10-19 18:07:04 -0700 | [diff] [blame^] | 736 | else |
JP Abgrall | 511eca3 | 2014-02-12 13:46:45 -0800 | [diff] [blame] | 737 | ret = sscanf(ptr, "%d", &dummy); |
| 738 | if (ntok != 1) |
| 739 | break; |
| 740 | consumed += cnt; |
| 741 | ptr += cnt; |
| 742 | } |
| 743 | |
| 744 | stats->ps_recv = handlep->packets_read; |
| 745 | stats->ps_ifdrop = 0; |
| 746 | return 0; |
| 747 | } |
| 748 | |
Elliott Hughes | d8845d7 | 2015-10-19 18:07:04 -0700 | [diff] [blame^] | 749 | static int |
JP Abgrall | 511eca3 | 2014-02-12 13:46:45 -0800 | [diff] [blame] | 750 | usb_setdirection_linux(pcap_t *p, pcap_direction_t d) |
| 751 | { |
| 752 | p->direction = d; |
| 753 | return 0; |
| 754 | } |
| 755 | |
| 756 | |
Elliott Hughes | d8845d7 | 2015-10-19 18:07:04 -0700 | [diff] [blame^] | 757 | static int |
JP Abgrall | 511eca3 | 2014-02-12 13:46:45 -0800 | [diff] [blame] | 758 | usb_stats_linux_bin(pcap_t *handle, struct pcap_stat *stats) |
| 759 | { |
| 760 | struct pcap_usb_linux *handlep = handle->priv; |
| 761 | int ret; |
| 762 | struct mon_bin_stats st; |
| 763 | ret = ioctl(handle->fd, MON_IOCG_STATS, &st); |
| 764 | if (ret < 0) |
| 765 | { |
| 766 | snprintf(handle->errbuf, PCAP_ERRBUF_SIZE, |
| 767 | "Can't read stats from fd %d:%s ", handle->fd, strerror(errno)); |
| 768 | return -1; |
| 769 | } |
| 770 | |
| 771 | stats->ps_recv = handlep->packets_read + st.queued; |
| 772 | stats->ps_drop = st.dropped; |
| 773 | stats->ps_ifdrop = 0; |
| 774 | return 0; |
| 775 | } |
| 776 | |
| 777 | /* |
Elliott Hughes | d8845d7 | 2015-10-19 18:07:04 -0700 | [diff] [blame^] | 778 | * see <linux-kernel-source>/Documentation/usb/usbmon.txt and |
JP Abgrall | 511eca3 | 2014-02-12 13:46:45 -0800 | [diff] [blame] | 779 | * <linux-kernel-source>/drivers/usb/mon/mon_bin.c binary ABI |
| 780 | */ |
| 781 | static int |
| 782 | usb_read_linux_bin(pcap_t *handle, int max_packets, pcap_handler callback, u_char *user) |
| 783 | { |
| 784 | struct pcap_usb_linux *handlep = handle->priv; |
| 785 | struct mon_bin_get info; |
| 786 | int ret; |
| 787 | struct pcap_pkthdr pkth; |
| 788 | int clen = handle->snapshot - sizeof(pcap_usb_header); |
| 789 | |
| 790 | /* the usb header is going to be part of 'packet' data*/ |
| 791 | info.hdr = (pcap_usb_header*) handle->buffer; |
| 792 | info.data = handle->buffer + sizeof(pcap_usb_header); |
| 793 | info.data_len = clen; |
| 794 | |
| 795 | /* ignore interrupt system call errors */ |
| 796 | do { |
| 797 | ret = ioctl(handle->fd, MON_IOCX_GET, &info); |
| 798 | if (handle->break_loop) |
| 799 | { |
| 800 | handle->break_loop = 0; |
| 801 | return -2; |
| 802 | } |
| 803 | } while ((ret == -1) && (errno == EINTR)); |
| 804 | if (ret < 0) |
| 805 | { |
| 806 | if (errno == EAGAIN) |
| 807 | return 0; /* no data there */ |
| 808 | |
| 809 | snprintf(handle->errbuf, PCAP_ERRBUF_SIZE, |
| 810 | "Can't read from fd %d: %s", handle->fd, strerror(errno)); |
| 811 | return -1; |
| 812 | } |
| 813 | |
| 814 | /* we can get less that than really captured from kernel, depending on |
| 815 | * snaplen, so adjust header accordingly */ |
| 816 | if (info.hdr->data_len < clen) |
| 817 | clen = info.hdr->data_len; |
| 818 | info.hdr->data_len = clen; |
| 819 | pkth.caplen = clen + sizeof(pcap_usb_header); |
| 820 | pkth.len = info.hdr->data_len + sizeof(pcap_usb_header); |
| 821 | pkth.ts.tv_sec = info.hdr->ts_sec; |
| 822 | pkth.ts.tv_usec = info.hdr->ts_usec; |
| 823 | |
| 824 | if (handle->fcode.bf_insns == NULL || |
| 825 | bpf_filter(handle->fcode.bf_insns, handle->buffer, |
| 826 | pkth.len, pkth.caplen)) { |
| 827 | handlep->packets_read++; |
| 828 | callback(user, &pkth, handle->buffer); |
| 829 | return 1; |
| 830 | } |
| 831 | |
| 832 | return 0; /* didn't pass filter */ |
| 833 | } |
| 834 | |
| 835 | /* |
Elliott Hughes | d8845d7 | 2015-10-19 18:07:04 -0700 | [diff] [blame^] | 836 | * see <linux-kernel-source>/Documentation/usb/usbmon.txt and |
JP Abgrall | 511eca3 | 2014-02-12 13:46:45 -0800 | [diff] [blame] | 837 | * <linux-kernel-source>/drivers/usb/mon/mon_bin.c binary ABI |
| 838 | */ |
| 839 | #define VEC_SIZE 32 |
| 840 | static int |
| 841 | usb_read_linux_mmap(pcap_t *handle, int max_packets, pcap_handler callback, u_char *user) |
| 842 | { |
| 843 | struct pcap_usb_linux *handlep = handle->priv; |
| 844 | struct mon_bin_mfetch fetch; |
| 845 | int32_t vec[VEC_SIZE]; |
| 846 | struct pcap_pkthdr pkth; |
| 847 | pcap_usb_header* hdr; |
| 848 | int nflush = 0; |
| 849 | int packets = 0; |
| 850 | int clen, max_clen; |
| 851 | |
| 852 | max_clen = handle->snapshot - sizeof(pcap_usb_header); |
| 853 | |
| 854 | for (;;) { |
| 855 | int i, ret; |
| 856 | int limit = max_packets - packets; |
| 857 | if (limit <= 0) |
| 858 | limit = VEC_SIZE; |
| 859 | if (limit > VEC_SIZE) |
| 860 | limit = VEC_SIZE; |
| 861 | |
| 862 | /* try to fetch as many events as possible*/ |
| 863 | fetch.offvec = vec; |
| 864 | fetch.nfetch = limit; |
| 865 | fetch.nflush = nflush; |
| 866 | /* ignore interrupt system call errors */ |
| 867 | do { |
| 868 | ret = ioctl(handle->fd, MON_IOCX_MFETCH, &fetch); |
| 869 | if (handle->break_loop) |
| 870 | { |
| 871 | handle->break_loop = 0; |
| 872 | return -2; |
| 873 | } |
| 874 | } while ((ret == -1) && (errno == EINTR)); |
| 875 | if (ret < 0) |
| 876 | { |
| 877 | if (errno == EAGAIN) |
| 878 | return 0; /* no data there */ |
| 879 | |
| 880 | snprintf(handle->errbuf, PCAP_ERRBUF_SIZE, |
| 881 | "Can't mfetch fd %d: %s", handle->fd, strerror(errno)); |
| 882 | return -1; |
| 883 | } |
| 884 | |
| 885 | /* keep track of processed events, we will flush them later */ |
| 886 | nflush = fetch.nfetch; |
| 887 | for (i=0; i<fetch.nfetch; ++i) { |
| 888 | /* discard filler */ |
| 889 | hdr = (pcap_usb_header*) &handlep->mmapbuf[vec[i]]; |
Elliott Hughes | d8845d7 | 2015-10-19 18:07:04 -0700 | [diff] [blame^] | 890 | if (hdr->event_type == '@') |
JP Abgrall | 511eca3 | 2014-02-12 13:46:45 -0800 | [diff] [blame] | 891 | continue; |
| 892 | |
| 893 | /* we can get less that than really captured from kernel, depending on |
| 894 | * snaplen, so adjust header accordingly */ |
| 895 | clen = max_clen; |
| 896 | if (hdr->data_len < clen) |
| 897 | clen = hdr->data_len; |
| 898 | |
| 899 | /* get packet info from header*/ |
| 900 | pkth.caplen = clen + sizeof(pcap_usb_header_mmapped); |
| 901 | pkth.len = hdr->data_len + sizeof(pcap_usb_header_mmapped); |
| 902 | pkth.ts.tv_sec = hdr->ts_sec; |
| 903 | pkth.ts.tv_usec = hdr->ts_usec; |
| 904 | |
| 905 | if (handle->fcode.bf_insns == NULL || |
| 906 | bpf_filter(handle->fcode.bf_insns, (u_char*) hdr, |
| 907 | pkth.len, pkth.caplen)) { |
| 908 | handlep->packets_read++; |
| 909 | callback(user, &pkth, (u_char*) hdr); |
| 910 | packets++; |
| 911 | } |
| 912 | } |
| 913 | |
| 914 | /* with max_packets specifying "unlimited" we stop afer the first chunk*/ |
| 915 | if (PACKET_COUNT_IS_UNLIMITED(max_packets) || (packets == max_packets)) |
| 916 | break; |
| 917 | } |
| 918 | |
| 919 | /* flush pending events*/ |
Elliott Hughes | d8845d7 | 2015-10-19 18:07:04 -0700 | [diff] [blame^] | 920 | if (ioctl(handle->fd, MON_IOCH_MFLUSH, nflush) == -1) { |
| 921 | snprintf(handle->errbuf, PCAP_ERRBUF_SIZE, |
| 922 | "Can't mflush fd %d: %s", handle->fd, strerror(errno)); |
| 923 | return -1; |
| 924 | } |
JP Abgrall | 511eca3 | 2014-02-12 13:46:45 -0800 | [diff] [blame] | 925 | return packets; |
| 926 | } |
| 927 | |
| 928 | static void |
| 929 | usb_cleanup_linux_mmap(pcap_t* handle) |
| 930 | { |
| 931 | struct pcap_usb_linux *handlep = handle->priv; |
| 932 | |
| 933 | /* if we have a memory-mapped buffer, unmap it */ |
| 934 | if (handlep->mmapbuf != NULL) { |
| 935 | munmap(handlep->mmapbuf, handlep->mmapbuflen); |
| 936 | handlep->mmapbuf = NULL; |
| 937 | } |
| 938 | pcap_cleanup_live_common(handle); |
| 939 | } |