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1/*
2 * Copyright (C) 2011 matt mooney <mfm@muteddisk.com>
3 * 2005-2007 Takahiro Hirofuchi
4 *
5 * This program is free software: you can redistribute it and/or modify
6 * it under the terms of the GNU General Public License as published by
7 * the Free Software Foundation, either version 2 of the License, or
8 * (at your option) any later version.
9 *
10 * This program is distributed in the hope that it will be useful,
11 * but WITHOUT ANY WARRANTY; without even the implied warranty of
12 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
13 * GNU General Public License for more details.
14 *
15 * You should have received a copy of the GNU General Public License
16 * along with this program. If not, see <http://www.gnu.org/licenses/>.
17 */
18
19#include <libudev.h>
20
21#include <errno.h>
22#include <stdio.h>
23#include <stdlib.h>
24#include <string.h>
25
26#include <getopt.h>
27
28#include "usbip_common.h"
29#include "utils.h"
30#include "usbip.h"
31#include "sysfs_utils.h"
32
33enum unbind_status {
34 UNBIND_ST_OK,
35 UNBIND_ST_USBIP_HOST,
36 UNBIND_ST_FAILED
37};
38
39static const char usbip_bind_usage_string[] =
40 "usbip bind <args>\n"
41 " -b, --busid=<busid> Bind " USBIP_HOST_DRV_NAME ".ko to device "
42 "on <busid>\n";
43
44void usbip_bind_usage(void)
45{
46 printf("usage: %s", usbip_bind_usage_string);
47}
48
49/* call at unbound state */
50static int bind_usbip(char *busid)
51{
52 char attr_name[] = "bind";
53 char bind_attr_path[SYSFS_PATH_MAX];
54 int rc = -1;
55
56 snprintf(bind_attr_path, sizeof(bind_attr_path), "%s/%s/%s/%s/%s/%s",
57 SYSFS_MNT_PATH, SYSFS_BUS_NAME, SYSFS_BUS_TYPE,
58 SYSFS_DRIVERS_NAME, USBIP_HOST_DRV_NAME, attr_name);
59
60 rc = write_sysfs_attribute(bind_attr_path, busid, strlen(busid));
61 if (rc < 0) {
62 err("error binding device %s to driver: %s", busid,
63 strerror(errno));
64 return -1;
65 }
66
67 return 0;
68}
69
70/* buggy driver may cause dead lock */
71static int unbind_other(char *busid)
72{
73 enum unbind_status status = UNBIND_ST_OK;
74
75 char attr_name[] = "unbind";
76 char unbind_attr_path[SYSFS_PATH_MAX];
77 int rc = -1;
78
79 struct udev *udev;
80 struct udev_device *dev;
81 const char *driver;
82 const char *bDevClass;
83
84 /* Create libudev context. */
85 udev = udev_new();
86
87 /* Get the device. */
88 dev = udev_device_new_from_subsystem_sysname(udev, "usb", busid);
89 if (!dev) {
90 dbg("unable to find device with bus ID %s", busid);
91 goto err_close_busid_dev;
92 }
93
94 /* Check what kind of device it is. */
95 bDevClass = udev_device_get_sysattr_value(dev, "bDeviceClass");
96 if (!bDevClass) {
97 dbg("unable to get bDevClass device attribute");
98 goto err_close_busid_dev;
99 }
100
101 if (!strncmp(bDevClass, "09", strlen(bDevClass))) {
102 dbg("skip unbinding of hub");
103 goto err_close_busid_dev;
104 }
105
106 /* Get the device driver. */
107 driver = udev_device_get_driver(dev);
108 if (!driver) {
109 /* No driver bound to this device. */
110 goto out;
111 }
112
113 if (!strncmp(USBIP_HOST_DRV_NAME, driver,
114 strlen(USBIP_HOST_DRV_NAME))) {
115 /* Already bound to usbip-host. */
116 status = UNBIND_ST_USBIP_HOST;
117 goto out;
118 }
119
120 /* Unbind device from driver. */
121 snprintf(unbind_attr_path, sizeof(unbind_attr_path), "%s/%s/%s/%s/%s/%s",
122 SYSFS_MNT_PATH, SYSFS_BUS_NAME, SYSFS_BUS_TYPE,
123 SYSFS_DRIVERS_NAME, driver, attr_name);
124
125 rc = write_sysfs_attribute(unbind_attr_path, busid, strlen(busid));
126 if (rc < 0) {
127 err("error unbinding device %s from driver", busid);
128 goto err_close_busid_dev;
129 }
130
131 goto out;
132
133err_close_busid_dev:
134 status = UNBIND_ST_FAILED;
135out:
136 udev_device_unref(dev);
137 udev_unref(udev);
138
139 return status;
140}
141
142static int bind_device(char *busid)
143{
144 int rc;
145 struct udev *udev;
146 struct udev_device *dev;
147
148 /* Check whether the device with this bus ID exists. */
149 udev = udev_new();
150 dev = udev_device_new_from_subsystem_sysname(udev, "usb", busid);
151 if (!dev) {
152 err("device with the specified bus ID does not exist");
153 return -1;
154 }
155 udev_unref(udev);
156
157 rc = unbind_other(busid);
158 if (rc == UNBIND_ST_FAILED) {
159 err("could not unbind driver from device on busid %s", busid);
160 return -1;
161 } else if (rc == UNBIND_ST_USBIP_HOST) {
162 err("device on busid %s is already bound to %s", busid,
163 USBIP_HOST_DRV_NAME);
164 return -1;
165 }
166
167 rc = modify_match_busid(busid, 1);
168 if (rc < 0) {
169 err("unable to bind device on %s", busid);
170 return -1;
171 }
172
173 rc = bind_usbip(busid);
174 if (rc < 0) {
175 err("could not bind device to %s", USBIP_HOST_DRV_NAME);
176 modify_match_busid(busid, 0);
177 return -1;
178 }
179
180 info("bind device on busid %s: complete", busid);
181
182 return 0;
183}
184
185int usbip_bind(int argc, char *argv[])
186{
187 static const struct option opts[] = {
188 { "busid", required_argument, NULL, 'b' },
189 { NULL, 0, NULL, 0 }
190 };
191
192 int opt;
193 int ret = -1;
194
195 for (;;) {
196 opt = getopt_long(argc, argv, "b:", opts, NULL);
197
198 if (opt == -1)
199 break;
200
201 switch (opt) {
202 case 'b':
203 ret = bind_device(optarg);
204 goto out;
205 default:
206 goto err_out;
207 }
208 }
209
210err_out:
211 usbip_bind_usage();
212out:
213 return ret;
214}