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* Copyright (C) 2011 matt mooney <mfm@muteddisk.com>
* 2005-2007 Takahiro Hirofuchi
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation, either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
#include <sys/types.h>
#include <sys/stat.h>
#include <fcntl.h>
#include <errno.h>
#include <unistd.h>
#include <libudev.h>
#include "usbip_common.h"
#include "usbip_host_driver.h"
#include "list.h"
#include "sysfs_utils.h"
#undef PROGNAME
#define PROGNAME "libusbip"
struct usbip_host_driver *host_driver;
struct udev *udev_context;
static int32_t read_attr_usbip_status(struct usbip_usb_device *udev)
{
char status_attr_path[SYSFS_PATH_MAX];
int fd;
int length;
char status;
int value = 0;
snprintf(status_attr_path, SYSFS_PATH_MAX, "%s/usbip_status",
udev->path);
fd = open(status_attr_path, O_RDONLY);
if (fd < 0) {
err("error opening attribute %s", status_attr_path);
return -1;
}
length = read(fd, &status, 1);
if (length < 0) {
err("error reading attribute %s", status_attr_path);
close(fd);
return -1;
}
value = atoi(&status);
return value;
}
static
struct usbip_exported_device *usbip_exported_device_new(const char *sdevpath)
{
struct usbip_exported_device *edev = NULL;
struct usbip_exported_device *edev_old;
size_t size;
int i;
edev = calloc(1, sizeof(struct usbip_exported_device));
edev->sudev = udev_device_new_from_syspath(udev_context, sdevpath);
if (!edev->sudev) {
err("udev_device_new_from_syspath: %s", sdevpath);
goto err;
}
read_usb_device(edev->sudev, &edev->udev);
edev->status = read_attr_usbip_status(&edev->udev);
if (edev->status < 0)
goto err;
/* reallocate buffer to include usb interface data */
size = sizeof(struct usbip_exported_device) +
edev->udev.bNumInterfaces * sizeof(struct usbip_usb_interface);
edev_old = edev;
edev = realloc(edev, size);
if (!edev) {
edev = edev_old;
dbg("realloc failed");
goto err;
}
for (i = 0; i < edev->udev.bNumInterfaces; i++)
read_usb_interface(&edev->udev, i, &edev->uinf[i]);
return edev;
err:
if (edev->sudev)
udev_device_unref(edev->sudev);
if (edev)
free(edev);
return NULL;
}
static int refresh_exported_devices(void)
{
struct usbip_exported_device *edev;
struct udev_enumerate *enumerate;
struct udev_list_entry *devices, *dev_list_entry;
struct udev_device *dev;
const char *path;
const char *driver;
enumerate = udev_enumerate_new(udev_context);
udev_enumerate_add_match_subsystem(enumerate, "usb");
udev_enumerate_scan_devices(enumerate);
devices = udev_enumerate_get_list_entry(enumerate);
udev_list_entry_foreach(dev_list_entry, devices) {
path = udev_list_entry_get_name(dev_list_entry);
dev = udev_device_new_from_syspath(udev_context, path);
if (dev == NULL)
continue;
/* Check whether device uses usbip-host driver. */
driver = udev_device_get_driver(dev);
if (driver != NULL && !strcmp(driver, USBIP_HOST_DRV_NAME)) {
edev = usbip_exported_device_new(path);
if (!edev) {
dbg("usbip_exported_device_new failed");
continue;
}
list_add(&edev->node, &host_driver->edev_list);
host_driver->ndevs++;
}
}
return 0;
}
static void usbip_exported_device_destroy(void)
{
struct list_head *i, *tmp;
struct usbip_exported_device *edev;
list_for_each_safe(i, tmp, &host_driver->edev_list) {
edev = list_entry(i, struct usbip_exported_device, node);
list_del(i);
free(edev);
}
}
int usbip_host_driver_open(void)
{
int rc;
udev_context = udev_new();
if (!udev_context) {
err("udev_new failed");
return -1;
}
host_driver = calloc(1, sizeof(*host_driver));
host_driver->ndevs = 0;
INIT_LIST_HEAD(&host_driver->edev_list);
rc = refresh_exported_devices();
if (rc < 0)
goto err_free_host_driver;
return 0;
err_free_host_driver:
free(host_driver);
host_driver = NULL;
udev_unref(udev_context);
return -1;
}
void usbip_host_driver_close(void)
{
if (!host_driver)
return;
usbip_exported_device_destroy();
free(host_driver);
host_driver = NULL;
udev_unref(udev_context);
}
int usbip_host_refresh_device_list(void)
{
int rc;
usbip_exported_device_destroy();
host_driver->ndevs = 0;
INIT_LIST_HEAD(&host_driver->edev_list);
rc = refresh_exported_devices();
if (rc < 0)
return -1;
return 0;
}
int usbip_host_export_device(struct usbip_exported_device *edev, int sockfd)
{
char attr_name[] = "usbip_sockfd";
char sockfd_attr_path[SYSFS_PATH_MAX];
char sockfd_buff[30];
int ret;
if (edev->status != SDEV_ST_AVAILABLE) {
dbg("device not available: %s", edev->udev.busid);
switch (edev->status) {
case SDEV_ST_ERROR:
dbg("status SDEV_ST_ERROR");
break;
case SDEV_ST_USED:
dbg("status SDEV_ST_USED");
break;
default:
dbg("status unknown: 0x%x", edev->status);
}
return -1;
}
/* only the first interface is true */
snprintf(sockfd_attr_path, sizeof(sockfd_attr_path), "%s/%s",
edev->udev.path, attr_name);
snprintf(sockfd_buff, sizeof(sockfd_buff), "%d\n", sockfd);
ret = write_sysfs_attribute(sockfd_attr_path, sockfd_buff,
strlen(sockfd_buff));
if (ret < 0) {
err("write_sysfs_attribute failed: sockfd %s to %s",
sockfd_buff, sockfd_attr_path);
return ret;
}
info("connect: %s", edev->udev.busid);
return ret;
}
struct usbip_exported_device *usbip_host_get_device(int num)
{
struct list_head *i;
struct usbip_exported_device *edev;
int cnt = 0;
list_for_each(i, &host_driver->edev_list) {
edev = list_entry(i, struct usbip_exported_device, node);
if (num == cnt)
return edev;
else
cnt++;
}
return NULL;
}
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