summaryrefslogtreecommitdiff
path: root/extras/usb_id/usb_id.c
blob: 492484da39ca3740d454b27230076aa9ec8be327 (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
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
/*
 * usb_id - identify an USB device
 *
 * Copyright (c) 2005 SUSE Linux Products GmbH, Germany
 *
 * Author:
 *	Hannes Reinecke <hare@suse.de>
 *
 *	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 version 2 of the License.
 */

#include <stdio.h>
#include <stdlib.h>
#include <stdarg.h>
#include <unistd.h>
#include <string.h>
#include <ctype.h>
#include <errno.h>
#include <getopt.h>

#include "../../udev/udev.h"

int debug;

static void log_fn(struct udev *udev, int priority,
		   const char *file, int line, const char *fn,
		   const char *format, va_list args)
{
	if (debug) {
		fprintf(stderr, "%s: ", fn != NULL ? fn : file);
		vfprintf(stderr, format, args);
	} else {
		vsyslog(priority, format, args);
	}
}

static char vendor_str[64];
static char model_str[64];
static char serial_str[UTIL_NAME_SIZE];
static char revision_str[64];
static char type_str[64];
static char instance_str[64];

static int use_usb_info;
static int use_num_info;

static void set_usb_iftype(char *to, int if_class_num, size_t len)
{
	char *type = "generic";

	switch (if_class_num) {
	case 1:
		type = "audio";
		break;
	case 3:
		type = "hid";
		break;
	case 7:
		type = "printer";
		break;
	case 8:
		type = "storage";
		break;
	case 2: /* CDC-Control */
		break;
	case 5: /* Physical */
		break;
	case 6: /* Image */
		break;
	case 9: /* HUB */
		break;
	case 0x0a: /* CDC-Data */
		break;
	case 0x0b: /* Chip/Smart Card */
		break;
	case 0x0d: /* Content Security */
		break;
	case 0x0e:
		type = "video";
		break;
	case 0xdc: /* Diagnostic Device */
		break;
	case 0xe0: /* Wireless Controller */
		break;
	case 0xf2: /* Application-specific */
		break;
	case 0xff: /* Vendor-specific */
		break;
	default:
		break;
	}
	strncpy(to, type, len);
	to[len-1] = '\0';
}

static int set_usb_mass_storage_ifsubtype(char *to, const char *from, size_t len)
{
	int type_num = 0;
	char *eptr;
	char *type = "generic";

	type_num = strtoul(from, &eptr, 0);
	if (eptr != from) {
		switch (type_num) {
		case 2:
			type = "cd";
			break;
		case 3:
			type = "tape";
			break;
		case 4: /* UFI */
		case 5: /* SFF-8070i */
			type = "floppy";
			break;
		case 1: /* RBC devices */
			type = "rbc";
			break;
		case 6: /* Transparent SPC-2 devices */
			type = "scsi";
			break;
		default:
			break;
		}
	}
	util_strlcpy(to, type, len);

	return type_num;
}

static void set_scsi_type(char *to, const char *from, size_t len)
{
	int type_num;
	char *eptr;
	char *type = "generic";

	type_num = strtoul(from, &eptr, 0);
	if (eptr != from) {
		switch (type_num) {
		case 0:
		case 0xe:
			type = "disk";
			break;
		case 1:
			type = "tape";
			break;
		case 4:
		case 7:
		case 0xf:
			type = "optical";
			break;
		case 5:
			type = "cd";
			break;
		default:
			break;
		}
	}
	util_strlcpy(to, type, len);
}

/*
 * A unique USB identification is generated like this:
 *
 * 1.) Get the USB device type from DeviceClass, InterfaceClass
 *     and InterfaceSubClass
 * 2.) If the device type is 'Mass-Storage/SPC-2' or 'Mass-Storage/RBC'
 *     use the SCSI vendor and model as USB-Vendor and USB-model.
 * 3.) Otherwise use the USB manufacturer and product as
 *     USB-Vendor and USB-model. Any non-printable characters
 *     in those strings will be skipped; a slash '/' will be converted
 *     into a full stop '.'.
 * 4.) If that fails, too, we will use idVendor and idProduct
 *     as USB-Vendor and USB-model.
 * 5.) The USB identification is the USB-vendor and USB-model
 *     string concatenated with an underscore '_'.
 * 6.) If the device supplies a serial number, this number
 *     is concatenated with the identification with an underscore '_'.
 */
static int usb_id(struct udev_device *dev)
{
	struct udev *udev = udev_device_get_udev(dev);
	struct udev_device *dev_interface;
	struct udev_device *dev_usb;
	const char *if_class, *if_subclass;
	int if_class_num;
	int protocol = 0;

	dbg(udev, "syspath %s\n", udev_device_get_syspath(dev));

	/* usb interface directory */
	dev_interface = udev_device_get_parent_with_subsystem(dev, "usb");
	if (dev_interface == NULL) {
		info(udev, "unable to access usb_interface device of '%s'\n",
		     udev_device_get_syspath(dev));
		return 1;
	}

	if_class = udev_device_get_sysattr_value(dev_interface, "bInterfaceClass");
	if (!if_class) {
		info(udev, "%s: cannot get bInterfaceClass attribute\n",
		     udev_device_get_sysname(dev));
		return 1;
	}
	if_class_num = strtoul(if_class, NULL, 16);
	if (if_class_num == 8) {
		if_subclass = udev_device_get_sysattr_value(dev_interface, "bInterfaceSubClass");
		if (if_subclass != NULL)
			protocol = set_usb_mass_storage_ifsubtype(type_str, if_subclass, sizeof(type_str)-1);
	} else {
		set_usb_iftype(type_str, if_class_num, sizeof(type_str)-1);
	}

	info(udev, "%s: if_class %d protocol %d\n",
	     udev_device_get_syspath(dev_interface), if_class_num, protocol);

	/* usb device directory */
	dev_usb = udev_device_get_parent_with_subsystem(dev_interface, "usb");
	if (!dev_usb) {
		info(udev, "unable to find parent 'usb' device of '%s'\n",
		     udev_device_get_syspath(dev));
		return 1;
	}

	/* mass storage */
	if (protocol == 6 && !use_usb_info) {
		struct udev_device *dev_scsi;
		const char *scsi_model, *scsi_vendor, *scsi_type, *scsi_rev;
		int host, bus, target, lun;

		/* get scsi device */
		dev_scsi = udev_device_get_parent_with_subsystem(dev, "scsi");
		if (dev_scsi == NULL) {
			info(udev, "unable to find parent 'scsi' device of '%s'\n",
			     udev_device_get_syspath(dev));
			goto fallback;
		}
		if (sscanf(udev_device_get_sysname(dev_scsi), "%d:%d:%d:%d", &host, &bus, &target, &lun) != 4) {
			info(udev, "invalid scsi device '%s'\n", udev_device_get_sysname(dev_scsi));
			goto fallback;
		}

		/* Generic SPC-2 device */
		scsi_vendor = udev_device_get_sysattr_value(dev_scsi, "vendor");
		if (!scsi_vendor) {
			info(udev, "%s: cannot get SCSI vendor attribute\n",
			     udev_device_get_sysname(dev_scsi));
			goto fallback;
		}
		udev_util_replace_whitespace(scsi_vendor, vendor_str, sizeof(vendor_str)-1);
		udev_util_replace_chars(vendor_str, NULL);

		scsi_model = udev_device_get_sysattr_value(dev_scsi, "model");
		if (!scsi_model) {
			info(udev, "%s: cannot get SCSI model attribute\n",
			     udev_device_get_sysname(dev_scsi));
			goto fallback;
		}
		udev_util_replace_whitespace(scsi_model, model_str, sizeof(model_str)-1);
		udev_util_replace_chars(model_str, NULL);

		scsi_type = udev_device_get_sysattr_value(dev_scsi, "type");
		if (!scsi_type) {
			info(udev, "%s: cannot get SCSI type attribute\n",
			     udev_device_get_sysname(dev_scsi));
			goto fallback;
		}
		set_scsi_type(type_str, scsi_type, sizeof(type_str)-1);

		scsi_rev = udev_device_get_sysattr_value(dev_scsi, "rev");
		if (!scsi_rev) {
			info(udev, "%s: cannot get SCSI revision attribute\n",
			     udev_device_get_sysname(dev_scsi));
			goto fallback;
		}
		udev_util_replace_whitespace(scsi_rev, revision_str, sizeof(revision_str)-1);
		udev_util_replace_chars(revision_str, NULL);

		/*
		 * some broken devices have the same identifiers
		 * for all luns, export the target:lun number
		 */
		sprintf(instance_str, "%d:%d", target, lun);
	}

fallback:
	/* fallback to USB vendor & device */
	if (vendor_str[0] == '\0') {
		const char *usb_vendor = NULL;

		if (!use_num_info)
			usb_vendor = udev_device_get_sysattr_value(dev_usb, "manufacturer");

		if (!usb_vendor)
			usb_vendor = udev_device_get_sysattr_value(dev_usb, "idVendor");

		if (!usb_vendor) {
			info(udev, "No USB vendor information available\n");
			return 1;
		}
		udev_util_replace_whitespace(usb_vendor, vendor_str, sizeof(vendor_str)-1);
		udev_util_replace_chars(vendor_str, NULL);
	}

	if (model_str[0] == '\0') {
		const char *usb_model = NULL;

		if (!use_num_info)
			usb_model = udev_device_get_sysattr_value(dev_usb, "product");

		if (!usb_model)
			usb_model = udev_device_get_sysattr_value(dev_usb, "idProduct");

		if (!usb_model) {
			dbg(udev, "No USB model information available\n");
			return 1;
		}
		udev_util_replace_whitespace(usb_model, model_str, sizeof(model_str)-1);
		udev_util_replace_chars(model_str, NULL);
	}

	if (revision_str[0] == '\0') {
		const char *usb_rev;

		usb_rev = udev_device_get_sysattr_value(dev_usb, "bcdDevice");
		if (usb_rev) {
			udev_util_replace_whitespace(usb_rev, revision_str, sizeof(revision_str)-1);
			udev_util_replace_chars(revision_str, NULL);
		}
	}

	if (serial_str[0] == '\0') {
		const char *usb_serial;

		usb_serial = udev_device_get_sysattr_value(dev_usb, "serial");
		if (usb_serial) {
			udev_util_replace_whitespace(usb_serial, serial_str, sizeof(serial_str)-1);
			udev_util_replace_chars(serial_str, NULL);
		}
	}
	return 0;
}

int main(int argc, char **argv)
{
	static const struct option options[] = {
		{ "usb-info", no_argument, NULL, 'u' },
		{ "num-info", no_argument, NULL, 'n' },
		{ "export", no_argument, NULL, 'x' },
		{ "debug", no_argument, NULL, 'd' },
		{ "help", no_argument, NULL, 'h' },
		{}
	};
	struct udev *udev;
	struct udev_device *dev = NULL;
	char syspath[UTIL_PATH_SIZE];
	const char *devpath;
	static int export;
	int retval = 0;

	udev = udev_new();
	if (udev == NULL)
		goto exit;

	logging_init("usb_id");
	udev_set_log_fn(udev, log_fn);

	while (1) {
		int option;

		option = getopt_long(argc, argv, "dnuxh", options, NULL);
		if (option == -1)
			break;

		switch (option) {
		case 'd':
			debug = 1;
			if (udev_get_log_priority(udev) < LOG_INFO)
				udev_set_log_priority(udev, LOG_INFO);
			break;
		case 'n':
			use_num_info = 1;
			use_usb_info = 1;
			break;
		case 'u':
			use_usb_info = 1;
			break;
		case 'x':
			export = 1;
			break;
		case 'h':
			printf("Usage: usb_id [--usb-info] [--num-info] [--export] [--help] <devpath>\n"
			       "  --usb-info  use usb strings instead\n"
			       "  --num-info  use numerical values\n"
			       "  --export    print values as environemt keys\n"
			       "  --help      print this help text\n\n");
		default:
			retval = 1;
			goto exit;
		}
	}

	devpath = getenv("DEVPATH");
	if (devpath == NULL)
		devpath = argv[optind];
	if (devpath == NULL) {
		fprintf(stderr, "No device specified\n");
		retval = 1;
		goto exit;
	}

	util_strlcpy(syspath, udev_get_sys_path(udev), sizeof(syspath));
	util_strlcat(syspath, devpath, sizeof(syspath));
	dev = udev_device_new_from_syspath(udev, syspath);
	if (dev == NULL) {
		err(udev, "unable to access '%s'\n", devpath);
		return 1;
	}

	retval = usb_id(dev);
	if (retval == 0) {
		char serial[256];

		util_strlcpy(serial, vendor_str, sizeof(serial));
		util_strlcat(serial, "_", sizeof(serial));
		util_strlcat(serial, model_str, sizeof(serial));
		if (serial_str[0] != '\0') {
			util_strlcat(serial, "_", sizeof(serial));
			util_strlcat(serial, serial_str, sizeof(serial));
		}
		if (instance_str[0] != '\0') {
			util_strlcat(serial, "-", sizeof(serial));
			util_strlcat(serial, instance_str, sizeof(serial));
		}

		if (export) {
			printf("ID_VENDOR=%s\n", vendor_str);
			printf("ID_MODEL=%s\n", model_str);
			printf("ID_REVISION=%s\n", revision_str);
			printf("ID_SERIAL=%s\n", serial);
			if (serial_str[0] != '\0')
				printf("ID_SERIAL_SHORT=%s\n", serial_str);
			printf("ID_TYPE=%s\n", type_str);
			if (instance_str[0] != '\0')
				printf("ID_INSTANCE=%s\n", instance_str);
			printf("ID_BUS=usb\n");
		} else
			printf("%s\n", serial);
	}

exit:
	udev_device_unref(dev);
	udev_unref(udev);
	logging_close();
	return retval;
}