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
|
/*
* 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 <libudev.h>
#include <errno.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <getopt.h>
#include "usbip_common.h"
#include "utils.h"
#include "usbip.h"
#include "sysfs_utils.h"
enum unbind_status {
UNBIND_ST_OK,
UNBIND_ST_USBIP_HOST,
UNBIND_ST_FAILED
};
static const char usbip_bind_usage_string[] =
"usbip bind <args>\n"
" -b, --busid=<busid> Bind " USBIP_HOST_DRV_NAME ".ko to device "
"on <busid>\n";
void usbip_bind_usage(void)
{
printf("usage: %s", usbip_bind_usage_string);
}
/* call at unbound state */
static int bind_usbip(char *busid)
{
char attr_name[] = "bind";
char bind_attr_path[SYSFS_PATH_MAX];
int rc = -1;
snprintf(bind_attr_path, sizeof(bind_attr_path), "%s/%s/%s/%s/%s/%s",
SYSFS_MNT_PATH, SYSFS_BUS_NAME, SYSFS_BUS_TYPE,
SYSFS_DRIVERS_NAME, USBIP_HOST_DRV_NAME, attr_name);
rc = write_sysfs_attribute(bind_attr_path, busid, strlen(busid));
if (rc < 0) {
err("error binding device %s to driver: %s", busid,
strerror(errno));
return -1;
}
return 0;
}
/* buggy driver may cause dead lock */
static int unbind_other(char *busid)
{
enum unbind_status status = UNBIND_ST_OK;
char attr_name[] = "unbind";
char unbind_attr_path[SYSFS_PATH_MAX];
int rc = -1;
struct udev *udev;
struct udev_device *dev;
const char *driver;
const char *bDevClass;
/* Create libudev context. */
udev = udev_new();
/* Get the device. */
dev = udev_device_new_from_subsystem_sysname(udev, "usb", busid);
if (!dev) {
dbg("unable to find device with bus ID %s", busid);
goto err_close_busid_dev;
}
/* Check what kind of device it is. */
bDevClass = udev_device_get_sysattr_value(dev, "bDeviceClass");
if (!bDevClass) {
dbg("unable to get bDevClass device attribute");
goto err_close_busid_dev;
}
if (!strncmp(bDevClass, "09", strlen(bDevClass))) {
dbg("skip unbinding of hub");
goto err_close_busid_dev;
}
/* Get the device driver. */
driver = udev_device_get_driver(dev);
if (!driver) {
/* No driver bound to this device. */
goto out;
}
if (!strncmp(USBIP_HOST_DRV_NAME, driver,
strlen(USBIP_HOST_DRV_NAME))) {
/* Already bound to usbip-host. */
status = UNBIND_ST_USBIP_HOST;
goto out;
}
/* Unbind device from driver. */
snprintf(unbind_attr_path, sizeof(unbind_attr_path), "%s/%s/%s/%s/%s/%s",
SYSFS_MNT_PATH, SYSFS_BUS_NAME, SYSFS_BUS_TYPE,
SYSFS_DRIVERS_NAME, driver, attr_name);
rc = write_sysfs_attribute(unbind_attr_path, busid, strlen(busid));
if (rc < 0) {
err("error unbinding device %s from driver", busid);
goto err_close_busid_dev;
}
goto out;
err_close_busid_dev:
status = UNBIND_ST_FAILED;
out:
udev_device_unref(dev);
udev_unref(udev);
return status;
}
static int bind_device(char *busid)
{
int rc;
struct udev *udev;
struct udev_device *dev;
/* Check whether the device with this bus ID exists. */
udev = udev_new();
dev = udev_device_new_from_subsystem_sysname(udev, "usb", busid);
if (!dev) {
err("device with the specified bus ID does not exist");
return -1;
}
udev_unref(udev);
rc = unbind_other(busid);
if (rc == UNBIND_ST_FAILED) {
err("could not unbind driver from device on busid %s", busid);
return -1;
} else if (rc == UNBIND_ST_USBIP_HOST) {
err("device on busid %s is already bound to %s", busid,
USBIP_HOST_DRV_NAME);
return -1;
}
rc = modify_match_busid(busid, 1);
if (rc < 0) {
err("unable to bind device on %s", busid);
return -1;
}
rc = bind_usbip(busid);
if (rc < 0) {
err("could not bind device to %s", USBIP_HOST_DRV_NAME);
modify_match_busid(busid, 0);
return -1;
}
info("bind device on busid %s: complete", busid);
return 0;
}
int usbip_bind(int argc, char *argv[])
{
static const struct option opts[] = {
{ "busid", required_argument, NULL, 'b' },
{ NULL, 0, NULL, 0 }
};
int opt;
int ret = -1;
for (;;) {
opt = getopt_long(argc, argv, "b:", opts, NULL);
if (opt == -1)
break;
switch (opt) {
case 'b':
ret = bind_device(optarg);
goto out;
default:
goto err_out;
}
}
err_out:
usbip_bind_usage();
out:
return ret;
}
|
