summaryrefslogtreecommitdiff
path: root/tools/usb/usbip/libsrc/usbip_host_driver.c
blob: bef08d5c44e8d9a648d673e11b331ed9e3569b9b (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
/*
 * 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;
}