summaryrefslogtreecommitdiffstats
path: root/devices/udev-helper.c
blob: 4ec054b38411ad8e053a2f3171de89dc2e865e84 (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
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547

#include <stdio.h>
#include <stdlib.h>
#include <stdarg.h>
#include <stdint.h>
#include <unistd.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <sys/socket.h>
#include <sys/wait.h>
#include <sys/un.h>
#include <fcntl.h>
#include <errno.h>
#include <string.h>
#include <asm/byteorder.h>
#include <linux/cdrom.h>
#include <sys/ioctl.h>

#include "parser.h"
#include "petitboot-paths.h"

/* Define below to operate without the frontend */
#undef USE_FAKE_SOCKET

/* Delay in seconds between polling of removable devices */
#define REMOVABLE_SLEEP_DELAY	2

static FILE *logf;
static int sock;

void pb_log(const char *fmt, ...)
{
	va_list ap;

	va_start(ap, fmt);
	vfprintf(logf, fmt, ap);
	va_end(ap);
}

static void print_boot_option(const struct boot_option *opt)
{
	pb_log("\tname: %s\n", opt->name);
	pb_log("\tdescription: %s\n", opt->description);
	pb_log("\tboot_image: %s\n", opt->boot_image_file);
	pb_log("\tinitrd: %s\n", opt->initrd_file);
	pb_log("\tboot_args: %s\n", opt->boot_args);

}

static void print_device(const struct device *dev)
{
	pb_log("\tid: %s\n", dev->id);
	pb_log("\tname: %s\n", dev->name);
	pb_log("\tdescription: %s\n", dev->description);
	pb_log("\tboot_image: %s\n", dev->icon_file);
}

static int write_action(int fd, enum device_action action)
{
	uint8_t action_buf = action;
	return write(fd, &action_buf, sizeof(action_buf)) != sizeof(action_buf);
}

static int write_string(int fd, const char *str)
{
	int len, pos = 0;
	uint32_t len_buf;

	if (!str) {
		len_buf = 0;
		if (write(fd, &len_buf, sizeof(len_buf)) != sizeof(len_buf)) {
			pb_log("write failed: %s\n", strerror(errno));
			return -1;
		}
		return 0;
	}

	len = strlen(str);
	if (len > (1ull << (sizeof(len_buf) * 8 - 1))) {
		pb_log("string too large\n");
		return -1;
	}

	len_buf = __cpu_to_be32(len);
	if (write(fd, &len_buf, sizeof(len_buf)) != sizeof(len_buf)) {
		pb_log("write failed: %s\n", strerror(errno));
		return -1;
	}

	while (pos < len) {
		int rc = write(fd, str, len - pos);
		if (rc <= 0) {
			pb_log("write failed: %s\n", strerror(errno));
			return -1;
		}
		pos += rc;
		str += rc;
	}

	return 0;
}

int add_device(const struct device *dev)
{
	int rc;

	pb_log("device added:\n");
	print_device(dev);
	rc = write_action(sock, DEV_ACTION_ADD_DEVICE) ||
		write_string(sock, dev->id) ||
		write_string(sock, dev->name) ||
		write_string(sock, dev->description) ||
		write_string(sock, dev->icon_file);

	if (rc)
		pb_log("error writing device %s to socket\n", dev->name);

	return rc;
}

int add_boot_option(const struct boot_option *opt)
{
	int rc;

	pb_log("boot option added:\n");
	print_boot_option(opt);

	rc = write_action(sock, DEV_ACTION_ADD_OPTION) ||
		write_string(sock, opt->id) ||
		write_string(sock, opt->name) ||
		write_string(sock, opt->description) ||
		write_string(sock, opt->icon_file) ||
		write_string(sock, opt->boot_image_file) ||
		write_string(sock, opt->initrd_file) ||
		write_string(sock, opt->boot_args);

	if (rc)
		pb_log("error writing boot option %s to socket\n", opt->name);

	return rc;
}

int remove_device(const char *dev_path)
{
	return write_action(sock, DEV_ACTION_REMOVE_DEVICE) ||
		write_string(sock, dev_path);
}

int connect_to_socket()
{
#ifndef USE_FAKE_SOCKET
	int fd;
	struct sockaddr_un addr;

	fd = socket(PF_UNIX, SOCK_STREAM, 0);
	if (fd == -1) {
		pb_log("can't create socket: %s\n", strerror(errno));
		return -1;
	}

	addr.sun_family = AF_UNIX;
	strcpy(addr.sun_path, PBOOT_DEVICE_SOCKET);

	if (connect(fd, (struct sockaddr *)&addr, sizeof(addr))) {
		pb_log("can't connect to %s: %s\n",
				addr.sun_path, strerror(errno));
		return -1;
	}
	sock = fd;

	return 0;
#else
	int fd;
	fd = open("./debug_socket", O_WRONLY | O_CREAT, 0640);
	if (fd < 0) {
		pb_log("can't create output file: %s\n", strerror(errno));
		return -1;
	}
	sock = fd;
	return 0;
#endif
}

int mount_device(const char *dev_path, char *mount_path)
{
	char *dir;
	const char *basename;
	int pid, status, rc = -1;

 	basename = strrchr(dev_path, '/');
 	if (basename)
 		basename++;
 	else
		basename = dev_path;
 
 	/* create a unique mountpoint */
 	dir = malloc(strlen(TMP_DIR) + 13 + strlen(basename));
 	sprintf(dir, "%s/mnt-%s-XXXXXX", TMP_DIR, basename);

	if (!mkdtemp(dir)) {
		pb_log("failed to create temporary directory in %s: %s",
				TMP_DIR, strerror(errno));
		goto out;
	}

	pid = fork();
	if (pid == -1) {
		pb_log("%s: fork failed: %s\n", __FUNCTION__, strerror(errno));
		goto out;
	}

	if (pid == 0) {
		execl(MOUNT_BIN, MOUNT_BIN, dev_path, dir, "-o", "ro", NULL);
		exit(EXIT_FAILURE);
	}

	if (waitpid(pid, &status, 0) == -1) {
		pb_log("%s: waitpid failed: %s\n", __FUNCTION__,
				strerror(errno));
		goto out;
	}

	if (WIFEXITED(status) && WEXITSTATUS(status) == 0) {
		strcpy(mount_path, dir);
		rc = 0;
	}

out:
	free(dir);
	return rc;
}

static int unmount_device(const char *dev_path)
{
	int pid, status, rc;

	pid = fork();

	if (pid == -1) {
		pb_log("%s: fork failed: %s\n", __FUNCTION__, strerror(errno));
		return -1;
	}

	if (pid == 0) {
		execl(UMOUNT_BIN, UMOUNT_BIN, dev_path, NULL);
		exit(EXIT_FAILURE);
	}

	if (waitpid(pid, &status, 0) == -1) {
		pb_log("%s: waitpid failed: %s\n", __FUNCTION__,
				strerror(errno));
		return -1;
	}

	rc = !WIFEXITED(status) || WEXITSTATUS(status) != 0;

	return rc;
}

static const struct device fake_boot_devices[] =
{
	{
		.id		= "fakeDisk0",
		.name		= "Hard Disk",
		.icon_file	= artwork_pathname("hdd.png"),
	},
	{
		.id		= "fakeDisk1",
		.name		= "PinkCat Linux CD",
		.icon_file	= artwork_pathname("cdrom.png"),
	}
};

static const struct boot_option fake_boot_options[] =
{
	{
		.id		= "fakeBoot0",
		.name		= "Bloobuntu Linux",
		.description	= "Boot Bloobuntu Linux",
		.icon_file	= artwork_pathname("hdd.png"),
	},
	{
		.id		= "fakeBoot1",
		.name		= "Pendora Gore 6",
		.description	= "Boot Pendora Gora 6",
		.icon_file	= artwork_pathname("hdd.png"),
	},
	{
		.id		= "fakeBoot2",
		.name		= "Genfoo Minux",
		.description	= "Boot Genfoo Minux",
		.icon_file	= artwork_pathname("hdd.png"),
	},
	{
		.id		= "fakeBoot3",
		.name		= "PinkCat Linux",
		.description	= "Install PinkCat Linux - Graphical install",
		.icon_file	= artwork_pathname("cdrom.png"),
	},
};

enum generic_icon_type guess_device_type(void)
{
	const char *type = getenv("ID_TYPE");
	const char *bus = getenv("ID_BUS");
	if (type && streq(type, "cd"))
		return ICON_TYPE_OPTICAL;
	if (!bus)
		return ICON_TYPE_UNKNOWN;
	if (streq(bus, "usb"))
		return ICON_TYPE_USB;
	if (streq(bus, "ata") || streq(bus, "scsi"))
		return ICON_TYPE_DISK;
	return ICON_TYPE_UNKNOWN;
}


static int is_removable_device(const char *sysfs_path) 
{
	char full_path[PATH_MAX];
	char buf[80];
	int fd, buf_len;

	sprintf(full_path, "/sys/%s/removable", sysfs_path);	
	fd = open(full_path, O_RDONLY);
	pb_log(" -> removable check on %s, fd=%d\n", full_path, fd);
	if (fd < 0)
		return 0;
	buf_len = read(fd, buf, 79);
	close(fd);
	if (buf_len < 0)
		return 0;
	buf[buf_len] = 0;
	return strtol(buf, NULL, 10);
}

static int is_ignored_device(const char *devname)
{
	static const char *ignored_devices[] = { "/dev/ram", NULL };
	const char **dev;

	for (dev = ignored_devices; *dev; dev++)
		if (!strncmp(devname, *dev, strlen(*dev)))
			return 1;

	return 0;
}

static int found_new_device(const char *dev_path)
{
	char mountpoint[PATH_MAX];

	if (mount_device(dev_path, mountpoint)) {
		pb_log("failed to mount %s\n", dev_path);
		return EXIT_FAILURE;
	}

	pb_log("mounted %s at %s\n", dev_path, mountpoint);

	iterate_parsers(dev_path, mountpoint);

	return EXIT_SUCCESS;
}

static void detach_and_sleep(int sec)
{
	static int forked = 0;
	int rc = 0;

	if (sec <= 0)
		return;

	if (!forked) {
		pb_log("running in background...");
		rc = fork();
		forked = 1;
	}

	if (rc == 0) {
		sleep(sec);

	} else if (rc == -1) {
		perror("fork()");
		exit(EXIT_FAILURE);
	} else {
		exit(EXIT_SUCCESS);
	}
}

static int poll_device_plug(const char *dev_path,
			    int *optical)
{
	int rc, fd;

	/* Polling loop for optical drive */
	for (; (*optical) != 0; ) {
		pb_log("poll for optical drive insertion ...\n");
		fd = open(dev_path, O_RDONLY|O_NONBLOCK);
		if (fd < 0)
			return EXIT_FAILURE;
		rc = ioctl(fd, CDROM_DRIVE_STATUS, CDSL_CURRENT);
		close(fd);
		if (rc == -1) {
			pb_log("not an optical drive, fallback...\n");
			break;
		}
		*optical = 1;
		if (rc == CDS_DISC_OK)
			return EXIT_SUCCESS;

		pb_log("no... waiting\n");
		detach_and_sleep(REMOVABLE_SLEEP_DELAY);
	}

	/* Fall back to bare open() */
	*optical = 0;
	for (;;) {
		pb_log("poll for non-optical drive insertion ...\n");
		fd = open(dev_path, O_RDONLY);
		if (fd < 0 && errno != ENOMEDIUM)
			return EXIT_FAILURE;
		close(fd);
		if (fd >= 0)
			return EXIT_SUCCESS;
		pb_log("no... waiting\n");
		detach_and_sleep(REMOVABLE_SLEEP_DELAY);
	}
}

static int poll_device_unplug(const char *dev_path, int optical)
{
	int rc, fd;

	for (;optical;) {
		pb_log("poll for optical drive removal ...\n");
		fd = open(dev_path, O_RDONLY|O_NONBLOCK);
		if (fd < 0)
			return EXIT_FAILURE;
		rc = ioctl(fd, CDROM_DRIVE_STATUS, CDSL_CURRENT);
		close(fd);
		if (rc != CDS_DISC_OK)
			return EXIT_SUCCESS;
		pb_log("no... waiting\n");
		detach_and_sleep(REMOVABLE_SLEEP_DELAY);
	}

	/* Fall back to bare open() */
	for (;;) {
		pb_log("poll for non-optical drive removal ...\n");
		fd = open(dev_path, O_RDONLY);
		if (fd < 0 && errno != ENOMEDIUM)
			return EXIT_FAILURE;
		close(fd);
		if (fd < 0)
			return EXIT_SUCCESS;
		pb_log("no... waiting\n");
		detach_and_sleep(REMOVABLE_SLEEP_DELAY);
	}
}

static int poll_removable_device(const char *sysfs_path,
				 const char *dev_path)
{
	int rc, mounted, optical = -1;
       
	for (;;) {
		rc = poll_device_plug(dev_path, &optical);
		if (rc == EXIT_FAILURE)
			return rc;
		rc = found_new_device(dev_path);
		mounted = (rc == EXIT_SUCCESS);

		poll_device_unplug(dev_path, optical);

		remove_device(dev_path);

		/* Unmount it repeatedly, if needs be */
		while (mounted && !unmount_device(dev_path))
			;
		detach_and_sleep(1);
	}
}

int main(int argc, char **argv)
{
	char *dev_path, *action;
	int rc;

	action = getenv("ACTION");

	logf = fopen("/var/tmp/petitboot-udev-helpers.log", "a");
	if (!logf)
		logf = stdout;
	pb_log("%d started\n", getpid());
	rc = EXIT_SUCCESS;

	if (!action) {
		pb_log("missing environment?\n");
		return EXIT_FAILURE;
	}

	if (connect_to_socket())
		return EXIT_FAILURE;

	if (streq(action, "fake")) {
		pb_log("fake mode");

		add_device(&fake_boot_devices[0]);
		add_boot_option(&fake_boot_options[0]);
		add_boot_option(&fake_boot_options[1]);
		add_boot_option(&fake_boot_options[2]);
		add_device(&fake_boot_devices[1]);
		add_boot_option(&fake_boot_options[3]);

		return EXIT_SUCCESS;
	}

	dev_path = getenv("DEVNAME");
	if (!dev_path) {
		pb_log("missing environment?\n");
		return EXIT_FAILURE;
	}

	if (is_ignored_device(dev_path))
		return EXIT_SUCCESS;

	if (streq(action, "add")) {
		char *sysfs_path = getenv("DEVPATH");
		if (sysfs_path && is_removable_device(sysfs_path))
			rc = poll_removable_device(sysfs_path, dev_path);
		else
			rc = found_new_device(dev_path);
	} else if (streq(action, "remove")) {
		pb_log("%s removed\n", dev_path);

		remove_device(dev_path);

		/* Unmount it repeatedly, if needs be */
		while (!unmount_device(dev_path))
			;

	} else {
		pb_log("invalid action '%s'\n", action);
		rc = EXIT_FAILURE;
	}
	return rc;
}
OpenPOWER on IntegriCloud