tools/usb/usbip/libsrc/vhci_driver.c

   1 // SPDX-License-Identifier: GPL-2.0
   2 /*
   3  * Copyright (C) 2005-2007 Takahiro Hirofuchi
   4  */
   5
   6 #include "usbip_common.h"
   7 #include "vhci_driver.h"
   8 #include <limits.h>
   9 #include <netdb.h>
  10 #include <libudev.h>
  11 #include <dirent.h>
  12 #include "sysfs_utils.h"
  13
  14 #undef  PROGNAME
  15 #define PROGNAME "libusbip"
  16
  17 struct usbip_vhci_driver *vhci_driver;
  18 struct udev *udev_context;
  19
  20 static struct usbip_imported_device *
  21 imported_device_init(struct usbip_imported_device *idev, char *busid)
  22 {
  23         struct udev_device *sudev;
  24
  25         sudev = udev_device_new_from_subsystem_sysname(udev_context,
  26                                                        "usb", busid);
  27         if (!sudev) {
  28                 dbg("udev_device_new_from_subsystem_sysname failed: %s", busid);
  29                 goto err;
  30         }
  31         read_usb_device(sudev, &idev->udev);
  32         udev_device_unref(sudev);
  33
  34         return idev;
  35
  36 err:
  37         return NULL;
  38 }
  39
  40 static int parse_status(const char *value)
  41 {
  42         int ret = 0;
  43         char *c;
  44
  45         /* skip a header line */
  46         c = strchr(value, '\n');
  47         if (!c)
  48                 return -1;
  49         c++;
  50
  51         while (*c != '\0') {
  52                 int port, status, speed, devid;
  53                 int sockfd;
  54                 char lbusid[SYSFS_BUS_ID_SIZE];
  55                 struct usbip_imported_device *idev;
  56                 char hub[3];
  57
  58                 ret = sscanf(c, "%2s  %d %d %d %x %u %31s\n",
  59                                 hub, &port, &status, &speed,
  60                                 &devid, &sockfd, lbusid);
  61
  62                 if (ret < 5) {
  63                         dbg("sscanf failed: %d", ret);
  64                         BUG();
  65                 }
  66
  67                 dbg("hub %s port %d status %d speed %d devid %x",
  68                                 hub, port, status, speed, devid);
  69                 dbg("sockfd %u lbusid %s", sockfd, lbusid);
  70
  71                 /* if a device is connected, look at it */
  72                 idev = &vhci_driver->idev[port];
  73                 memset(idev, 0, sizeof(*idev));
  74
  75                 if (strncmp("hs", hub, 2) == 0)
  76                         idev->hub = HUB_SPEED_HIGH;
  77                 else /* strncmp("ss", hub, 2) == 0 */
  78                         idev->hub = HUB_SPEED_SUPER;
  79
  80                 idev->port      = port;
  81                 idev->status    = status;
  82
  83                 idev->devid     = devid;
  84
  85                 idev->busnum    = (devid >> 16);
  86                 idev->devnum    = (devid & 0x0000ffff);
  87
  88                 if (idev->status != VDEV_ST_NULL
  89                     && idev->status != VDEV_ST_NOTASSIGNED) {
  90                         idev = imported_device_init(idev, lbusid);
  91                         if (!idev) {
  92                                 dbg("imported_device_init failed");
  93                                 return -1;
  94                         }
  95                 }
  96
  97                 /* go to the next line */
  98                 c = strchr(c, '\n');
  99                 if (!c)
 100                         break;
 101                 c++;
 102         }
 103
 104         dbg("exit");
 105
 106         return 0;
 107 }
 108
 109 #define MAX_STATUS_NAME 18
 110
 111 static int refresh_imported_device_list(void)
 112 {
 113         const char *attr_status;
 114         char status[MAX_STATUS_NAME+1] = "status";
 115         int i, ret;
 116
 117         for (i = 0; i < vhci_driver->ncontrollers; i++) {
 118                 if (i > 0)
 119                         snprintf(status, sizeof(status), "status.%d", i);
 120
 121                 attr_status = udev_device_get_sysattr_value(vhci_driver->hc_device,
 122                                                             status);
 123                 if (!attr_status) {
 124                         err("udev_device_get_sysattr_value failed");
 125                         return -1;
 126                 }
 127
 128                 dbg("controller %d", i);
 129
 130                 ret = parse_status(attr_status);
 131                 if (ret != 0)
 132                         return ret;
 133         }
 134
 135         return 0;
 136 }
 137
 138 static int get_nports(void)
 139 {
 140         const char *attr_nports;
 141
 142         attr_nports = udev_device_get_sysattr_value(vhci_driver->hc_device, "nports");
 143         if (!attr_nports) {
 144                 err("udev_device_get_sysattr_value nports failed");
 145                 return -1;
 146         }
 147
 148         return (int)strtoul(attr_nports, NULL, 10);
 149 }
 150
 151 static int vhci_hcd_filter(const struct dirent *dirent)
 152 {
 153         return strcmp(dirent->d_name, "vhci_hcd") >= 0;
 154 }
 155
 156 static int get_ncontrollers(void)
 157 {
 158         struct dirent **namelist;
 159         struct udev_device *platform;
 160         int n;
 161
 162         platform = udev_device_get_parent(vhci_driver->hc_device);
 163         if (platform == NULL)
 164                 return -1;
 165
 166         n = scandir(udev_device_get_syspath(platform), &namelist, vhci_hcd_filter, NULL);
 167         if (n < 0)
 168                 err("scandir failed");
 169         else {
 170                 for (int i = 0; i < n; i++)
 171                         free(namelist[i]);
 172                 free(namelist);
 173         }
 174
 175         return n;
 176 }
 177
 178 /*
 179  * Read the given port's record.
 180  *
 181  * To avoid buffer overflow we will read the entire line and
 182  * validate each part's size. The initial buffer is padded by 4 to
 183  * accommodate the 2 spaces, 1 newline and an additional character
 184  * which is needed to properly validate the 3rd part without it being
 185  * truncated to an acceptable length.
 186  */
 187 static int read_record(int rhport, char *host, unsigned long host_len,
 188                 char *port, unsigned long port_len, char *busid)
 189 {
 190         int part;
 191         FILE *file;
 192         char path[PATH_MAX+1];
 193         char *buffer, *start, *end;
 194         char delim[] = {' ', ' ', '\n'};
 195         int max_len[] = {(int)host_len, (int)port_len, SYSFS_BUS_ID_SIZE};
 196         size_t buffer_len = host_len + port_len + SYSFS_BUS_ID_SIZE + 4;
 197
 198         buffer = malloc(buffer_len);
 199         if (!buffer)
 200                 return -1;
 201
 202         snprintf(path, PATH_MAX, VHCI_STATE_PATH"/port%d", rhport);
 203
 204         file = fopen(path, "r");
 205         if (!file) {
 206                 err("fopen");
 207                 free(buffer);
 208                 return -1;
 209         }
 210
 211         if (fgets(buffer, buffer_len, file) == NULL) {
 212                 err("fgets");
 213                 free(buffer);
 214                 fclose(file);
 215                 return -1;
 216         }
 217         fclose(file);
 218
 219         /* validate the length of each of the 3 parts */
 220         start = buffer;
 221         for (part = 0; part < 3; part++) {
 222                 end = strchr(start, delim[part]);
 223                 if (end == NULL || (end - start) > max_len[part]) {
 224                         free(buffer);
 225                         return -1;
 226                 }
 227                 start = end + 1;
 228         }
 229
 230         if (sscanf(buffer, "%s %s %s\n", host, port, busid) != 3) {
 231                 err("sscanf");
 232                 free(buffer);
 233                 return -1;
 234         }
 235
 236         free(buffer);
 237
 238         return 0;
 239 }
 240
 241 /* ---------------------------------------------------------------------- */
 242
 243 int usbip_vhci_driver_open(void)
 244 {
 245         udev_context = udev_new();
 246         if (!udev_context) {
 247                 err("udev_new failed");
 248                 return -1;
 249         }
 250
 251         vhci_driver = calloc(1, sizeof(struct usbip_vhci_driver));
 252
 253         /* will be freed in usbip_driver_close() */
 254         vhci_driver->hc_device =
 255                 udev_device_new_from_subsystem_sysname(udev_context,
 256                                                        USBIP_VHCI_BUS_TYPE,
 257                                                        USBIP_VHCI_DEVICE_NAME);
 258         if (!vhci_driver->hc_device) {
 259                 err("udev_device_new_from_subsystem_sysname failed");
 260                 goto err;
 261         }
 262
 263         vhci_driver->nports = get_nports();
 264         dbg("available ports: %d", vhci_driver->nports);
 265
 266         if (vhci_driver->nports <= 0) {
 267                 err("no available ports");
 268                 goto err;
 269         } else if (vhci_driver->nports > MAXNPORT) {
 270                 err("port number exceeds %d", MAXNPORT);
 271                 goto err;
 272         }
 273
 274         vhci_driver->ncontrollers = get_ncontrollers();
 275         dbg("available controllers: %d", vhci_driver->ncontrollers);
 276
 277         if (vhci_driver->ncontrollers <=0) {
 278                 err("no available usb controllers");
 279                 goto err;
 280         }
 281
 282         if (refresh_imported_device_list())
 283                 goto err;
 284
 285         return 0;
 286
 287 err:
 288         udev_device_unref(vhci_driver->hc_device);
 289
 290         if (vhci_driver)
 291                 free(vhci_driver);
 292
 293         vhci_driver = NULL;
 294
 295         udev_unref(udev_context);
 296
 297         return -1;
 298 }
 299
 300
 301 void usbip_vhci_driver_close(void)
 302 {
 303         if (!vhci_driver)
 304                 return;
 305
 306         udev_device_unref(vhci_driver->hc_device);
 307
 308         free(vhci_driver);
 309
 310         vhci_driver = NULL;
 311
 312         udev_unref(udev_context);
 313 }
 314
 315
 316 int usbip_vhci_refresh_device_list(void)
 317 {
 318
 319         if (refresh_imported_device_list())
 320                 goto err;
 321
 322         return 0;
 323 err:
 324         dbg("failed to refresh device list");
 325         return -1;
 326 }
 327
 328
 329 int usbip_vhci_get_free_port(uint32_t speed)
 330 {
 331         for (int i = 0; i < vhci_driver->nports; i++) {
 332
 333                 switch (speed) {
 334                 case    USB_SPEED_SUPER:
 335                         if (vhci_driver->idev[i].hub != HUB_SPEED_SUPER)
 336                                 continue;
 337                 break;
 338                 default:
 339                         if (vhci_driver->idev[i].hub != HUB_SPEED_HIGH)
 340                                 continue;
 341                 break;
 342                 }
 343
 344                 if (vhci_driver->idev[i].status == VDEV_ST_NULL)
 345                         return vhci_driver->idev[i].port;
 346         }
 347
 348         return -1;
 349 }
 350
 351 int usbip_vhci_attach_device2(uint8_t port, int sockfd, uint32_t devid,
 352                 uint32_t speed) {
 353         char buff[200]; /* what size should be ? */
 354         char attach_attr_path[SYSFS_PATH_MAX];
 355         char attr_attach[] = "attach";
 356         const char *path;
 357         int ret;
 358
 359         snprintf(buff, sizeof(buff), "%u %d %u %u",
 360                         port, sockfd, devid, speed);
 361         dbg("writing: %s", buff);
 362
 363         path = udev_device_get_syspath(vhci_driver->hc_device);
 364         snprintf(attach_attr_path, sizeof(attach_attr_path), "%s/%s",
 365                  path, attr_attach);
 366         dbg("attach attribute path: %s", attach_attr_path);
 367
 368         ret = write_sysfs_attribute(attach_attr_path, buff, strlen(buff));
 369         if (ret < 0) {
 370                 dbg("write_sysfs_attribute failed");
 371                 return -1;
 372         }
 373
 374         dbg("attached port: %d", port);
 375
 376         return 0;
 377 }
 378
 379 static unsigned long get_devid(uint8_t busnum, uint8_t devnum)
 380 {
 381         return (busnum << 16) | devnum;
 382 }
 383
 384 /* will be removed */
 385 int usbip_vhci_attach_device(uint8_t port, int sockfd, uint8_t busnum,
 386                 uint8_t devnum, uint32_t speed)
 387 {
 388         int devid = get_devid(busnum, devnum);
 389
 390         return usbip_vhci_attach_device2(port, sockfd, devid, speed);
 391 }
 392
 393 int usbip_vhci_detach_device(uint8_t port)
 394 {
 395         char detach_attr_path[SYSFS_PATH_MAX];
 396         char attr_detach[] = "detach";
 397         char buff[200]; /* what size should be ? */
 398         const char *path;
 399         int ret;
 400
 401         snprintf(buff, sizeof(buff), "%u", port);
 402         dbg("writing: %s", buff);
 403
 404         path = udev_device_get_syspath(vhci_driver->hc_device);
 405         snprintf(detach_attr_path, sizeof(detach_attr_path), "%s/%s",
 406                  path, attr_detach);
 407         dbg("detach attribute path: %s", detach_attr_path);
 408
 409         ret = write_sysfs_attribute(detach_attr_path, buff, strlen(buff));
 410         if (ret < 0) {
 411                 dbg("write_sysfs_attribute failed");
 412                 return -1;
 413         }
 414
 415         dbg("detached port: %d", port);
 416
 417         return 0;
 418 }
 419
 420 int usbip_vhci_imported_device_dump(struct usbip_imported_device *idev)
 421 {
 422         char product_name[100];
 423         char host[NI_MAXHOST] = "unknown host";
 424         char serv[NI_MAXSERV] = "unknown port";
 425         char remote_busid[SYSFS_BUS_ID_SIZE];
 426         int ret;
 427         int read_record_error = 0;
 428
 429         if (idev->status == VDEV_ST_NULL || idev->status == VDEV_ST_NOTASSIGNED)
 430                 return 0;
 431
 432         ret = read_record(idev->port, host, sizeof(host), serv, sizeof(serv),
 433                           remote_busid);
 434         if (ret) {
 435                 err("read_record");
 436                 read_record_error = 1;
 437         }
 438
 439         printf("Port %02d: <%s> at %s\n", idev->port,
 440                usbip_status_string(idev->status),
 441                usbip_speed_string(idev->udev.speed));
 442
 443         usbip_names_get_product(product_name, sizeof(product_name),
 444                                 idev->udev.idVendor, idev->udev.idProduct);
 445
 446         printf("       %s\n",  product_name);
 447
 448         if (!read_record_error) {
 449                 printf("%10s -> usbip://%s:%s/%s\n", idev->udev.busid,
 450                        host, serv, remote_busid);
 451                 printf("%10s -> remote bus/dev %03d/%03d\n", " ",
 452                        idev->busnum, idev->devnum);
 453         } else {
 454                 printf("%10s -> unknown host, remote port and remote busid\n",
 455                        idev->udev.busid);
 456                 printf("%10s -> remote bus/dev %03d/%03d\n", " ",
 457                        idev->busnum, idev->devnum);
 458         }
 459
 460         return 0;
 461 }