468 lines
9.7 KiB
C
468 lines
9.7 KiB
C
// SPDX-License-Identifier: GPL-2.0
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/*
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* Copyright (C) 2005-2007 Takahiro Hirofuchi
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*/
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#include "usbip_common.h"
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#include "vhci_driver.h"
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#include <limits.h>
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#include <netdb.h>
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#include <libudev.h>
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#include <dirent.h>
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#include "sysfs_utils.h"
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#undef PROGNAME
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#define PROGNAME "libusbip"
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struct usbip_vhci_driver *vhci_driver;
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struct udev *udev_context;
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static struct usbip_imported_device *
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imported_device_init(struct usbip_imported_device *idev, char *busid)
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{
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struct udev_device *sudev;
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sudev = udev_device_new_from_subsystem_sysname(udev_context,
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"usb", busid);
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if (!sudev) {
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dbg("udev_device_new_from_subsystem_sysname failed: %s", busid);
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goto err;
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}
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read_usb_device(sudev, &idev->udev);
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udev_device_unref(sudev);
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return idev;
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err:
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return NULL;
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}
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static int parse_status(const char *value)
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{
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int ret = 0;
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char *c;
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/* skip a header line */
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c = strchr(value, '\n');
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if (!c)
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return -1;
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c++;
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while (*c != '\0') {
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int port, status, speed, devid;
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int sockfd;
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char lbusid[SYSFS_BUS_ID_SIZE];
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struct usbip_imported_device *idev;
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char hub[3];
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ret = sscanf(c, "%2s %d %d %d %x %u %31s\n",
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hub, &port, &status, &speed,
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&devid, &sockfd, lbusid);
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if (ret < 5) {
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dbg("sscanf failed: %d", ret);
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BUG();
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}
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dbg("hub %s port %d status %d speed %d devid %x",
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hub, port, status, speed, devid);
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dbg("sockfd %u lbusid %s", sockfd, lbusid);
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/* if a device is connected, look at it */
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idev = &vhci_driver->idev[port];
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memset(idev, 0, sizeof(*idev));
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if (strncmp("hs", hub, 2) == 0)
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idev->hub = HUB_SPEED_HIGH;
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else /* strncmp("ss", hub, 2) == 0 */
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idev->hub = HUB_SPEED_SUPER;
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idev->port = port;
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idev->status = status;
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idev->devid = devid;
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idev->busnum = (devid >> 16);
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idev->devnum = (devid & 0x0000ffff);
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if (idev->status != VDEV_ST_NULL
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&& idev->status != VDEV_ST_NOTASSIGNED) {
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idev = imported_device_init(idev, lbusid);
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if (!idev) {
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dbg("imported_device_init failed");
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return -1;
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}
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}
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/* go to the next line */
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c = strchr(c, '\n');
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if (!c)
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break;
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c++;
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}
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dbg("exit");
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return 0;
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}
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#define MAX_STATUS_NAME 18
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static int refresh_imported_device_list(void)
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{
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const char *attr_status;
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char status[MAX_STATUS_NAME+1] = "status";
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int i, ret;
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for (i = 0; i < vhci_driver->ncontrollers; i++) {
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if (i > 0)
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snprintf(status, sizeof(status), "status.%d", i);
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attr_status = udev_device_get_sysattr_value(vhci_driver->hc_device,
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status);
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if (!attr_status) {
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err("udev_device_get_sysattr_value failed");
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return -1;
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}
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dbg("controller %d", i);
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ret = parse_status(attr_status);
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if (ret != 0)
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return ret;
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}
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return 0;
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}
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static int get_nports(struct udev_device *hc_device)
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{
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const char *attr_nports;
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attr_nports = udev_device_get_sysattr_value(hc_device, "nports");
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if (!attr_nports) {
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err("udev_device_get_sysattr_value nports failed");
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return -1;
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}
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return (int)strtoul(attr_nports, NULL, 10);
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}
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static int vhci_hcd_filter(const struct dirent *dirent)
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{
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return strcmp(dirent->d_name, "vhci_hcd") >= 0;
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}
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static int get_ncontrollers(void)
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{
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struct dirent **namelist;
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struct udev_device *platform;
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int n;
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platform = udev_device_get_parent(vhci_driver->hc_device);
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if (platform == NULL)
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return -1;
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n = scandir(udev_device_get_syspath(platform), &namelist, vhci_hcd_filter, NULL);
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if (n < 0)
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err("scandir failed");
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else {
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for (int i = 0; i < n; i++)
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free(namelist[i]);
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free(namelist);
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}
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return n;
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}
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/*
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* Read the given port's record.
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*
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* To avoid buffer overflow we will read the entire line and
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* validate each part's size. The initial buffer is padded by 4 to
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* accommodate the 2 spaces, 1 newline and an additional character
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* which is needed to properly validate the 3rd part without it being
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* truncated to an acceptable length.
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*/
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static int read_record(int rhport, char *host, unsigned long host_len,
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char *port, unsigned long port_len, char *busid)
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{
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int part;
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FILE *file;
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char path[PATH_MAX+1];
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char *buffer, *start, *end;
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char delim[] = {' ', ' ', '\n'};
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int max_len[] = {(int)host_len, (int)port_len, SYSFS_BUS_ID_SIZE};
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size_t buffer_len = host_len + port_len + SYSFS_BUS_ID_SIZE + 4;
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buffer = malloc(buffer_len);
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if (!buffer)
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return -1;
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snprintf(path, PATH_MAX, VHCI_STATE_PATH"/port%d", rhport);
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file = fopen(path, "r");
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if (!file) {
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err("fopen");
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free(buffer);
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return -1;
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}
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if (fgets(buffer, buffer_len, file) == NULL) {
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err("fgets");
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free(buffer);
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fclose(file);
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return -1;
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}
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fclose(file);
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/* validate the length of each of the 3 parts */
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start = buffer;
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for (part = 0; part < 3; part++) {
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end = strchr(start, delim[part]);
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if (end == NULL || (end - start) > max_len[part]) {
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free(buffer);
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return -1;
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}
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start = end + 1;
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}
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if (sscanf(buffer, "%s %s %s\n", host, port, busid) != 3) {
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err("sscanf");
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free(buffer);
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return -1;
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}
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free(buffer);
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return 0;
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}
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/* ---------------------------------------------------------------------- */
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int usbip_vhci_driver_open(void)
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{
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int nports;
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struct udev_device *hc_device;
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udev_context = udev_new();
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if (!udev_context) {
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err("udev_new failed");
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return -1;
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}
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/* will be freed in usbip_driver_close() */
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hc_device =
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udev_device_new_from_subsystem_sysname(udev_context,
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USBIP_VHCI_BUS_TYPE,
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USBIP_VHCI_DEVICE_NAME);
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if (!hc_device) {
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err("udev_device_new_from_subsystem_sysname failed");
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goto err;
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}
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nports = get_nports(hc_device);
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if (nports <= 0) {
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err("no available ports");
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goto err;
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}
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dbg("available ports: %d", nports);
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vhci_driver = calloc(1, sizeof(struct usbip_vhci_driver) +
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nports * sizeof(struct usbip_imported_device));
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if (!vhci_driver) {
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err("vhci_driver allocation failed");
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goto err;
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}
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vhci_driver->nports = nports;
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vhci_driver->hc_device = hc_device;
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vhci_driver->ncontrollers = get_ncontrollers();
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dbg("available controllers: %d", vhci_driver->ncontrollers);
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if (vhci_driver->ncontrollers <=0) {
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err("no available usb controllers");
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goto err;
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}
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if (refresh_imported_device_list())
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goto err;
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return 0;
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err:
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udev_device_unref(hc_device);
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if (vhci_driver)
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free(vhci_driver);
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vhci_driver = NULL;
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udev_unref(udev_context);
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return -1;
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}
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void usbip_vhci_driver_close(void)
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{
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if (!vhci_driver)
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return;
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udev_device_unref(vhci_driver->hc_device);
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free(vhci_driver);
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vhci_driver = NULL;
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udev_unref(udev_context);
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}
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int usbip_vhci_refresh_device_list(void)
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{
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if (refresh_imported_device_list())
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goto err;
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return 0;
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err:
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dbg("failed to refresh device list");
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return -1;
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}
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int usbip_vhci_get_free_port(uint32_t speed)
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{
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for (int i = 0; i < vhci_driver->nports; i++) {
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switch (speed) {
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case USB_SPEED_SUPER:
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if (vhci_driver->idev[i].hub != HUB_SPEED_SUPER)
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continue;
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break;
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default:
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if (vhci_driver->idev[i].hub != HUB_SPEED_HIGH)
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continue;
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break;
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}
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if (vhci_driver->idev[i].status == VDEV_ST_NULL)
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return vhci_driver->idev[i].port;
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}
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return -1;
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}
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int usbip_vhci_attach_device2(uint8_t port, int sockfd, uint32_t devid,
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uint32_t speed) {
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char buff[200]; /* what size should be ? */
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char attach_attr_path[SYSFS_PATH_MAX];
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char attr_attach[] = "attach";
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const char *path;
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int ret;
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snprintf(buff, sizeof(buff), "%u %d %u %u",
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port, sockfd, devid, speed);
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dbg("writing: %s", buff);
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path = udev_device_get_syspath(vhci_driver->hc_device);
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snprintf(attach_attr_path, sizeof(attach_attr_path), "%s/%s",
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path, attr_attach);
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dbg("attach attribute path: %s", attach_attr_path);
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ret = write_sysfs_attribute(attach_attr_path, buff, strlen(buff));
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if (ret < 0) {
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dbg("write_sysfs_attribute failed");
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return -1;
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}
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dbg("attached port: %d", port);
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return 0;
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}
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static unsigned long get_devid(uint8_t busnum, uint8_t devnum)
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{
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return (busnum << 16) | devnum;
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}
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/* will be removed */
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int usbip_vhci_attach_device(uint8_t port, int sockfd, uint8_t busnum,
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uint8_t devnum, uint32_t speed)
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{
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int devid = get_devid(busnum, devnum);
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return usbip_vhci_attach_device2(port, sockfd, devid, speed);
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}
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int usbip_vhci_detach_device(uint8_t port)
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{
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char detach_attr_path[SYSFS_PATH_MAX];
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char attr_detach[] = "detach";
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char buff[200]; /* what size should be ? */
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const char *path;
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int ret;
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snprintf(buff, sizeof(buff), "%u", port);
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dbg("writing: %s", buff);
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path = udev_device_get_syspath(vhci_driver->hc_device);
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snprintf(detach_attr_path, sizeof(detach_attr_path), "%s/%s",
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path, attr_detach);
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dbg("detach attribute path: %s", detach_attr_path);
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ret = write_sysfs_attribute(detach_attr_path, buff, strlen(buff));
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if (ret < 0) {
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dbg("write_sysfs_attribute failed");
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return -1;
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}
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dbg("detached port: %d", port);
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return 0;
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}
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int usbip_vhci_imported_device_dump(struct usbip_imported_device *idev)
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{
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char product_name[100];
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char host[NI_MAXHOST] = "unknown host";
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char serv[NI_MAXSERV] = "unknown port";
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char remote_busid[SYSFS_BUS_ID_SIZE];
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int ret;
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int read_record_error = 0;
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if (idev->status == VDEV_ST_NULL || idev->status == VDEV_ST_NOTASSIGNED)
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return 0;
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ret = read_record(idev->port, host, sizeof(host), serv, sizeof(serv),
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remote_busid);
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if (ret) {
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err("read_record");
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read_record_error = 1;
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}
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printf("Port %02d: <%s> at %s\n", idev->port,
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usbip_status_string(idev->status),
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usbip_speed_string(idev->udev.speed));
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usbip_names_get_product(product_name, sizeof(product_name),
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idev->udev.idVendor, idev->udev.idProduct);
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printf(" %s\n", product_name);
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if (!read_record_error) {
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printf("%10s -> usbip://%s:%s/%s\n", idev->udev.busid,
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host, serv, remote_busid);
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printf("%10s -> remote bus/dev %03d/%03d\n", " ",
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idev->busnum, idev->devnum);
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} else {
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printf("%10s -> unknown host, remote port and remote busid\n",
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idev->udev.busid);
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printf("%10s -> remote bus/dev %03d/%03d\n", " ",
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idev->busnum, idev->devnum);
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}
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return 0;
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}
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