summaryrefslogtreecommitdiffstats
path: root/discover/device-handler.c
blob: 487f2e73506221a316cd8e3b72928cccc733b167 (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
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
604
605
606
607
608
609
610
611
612
613
614
615
616
617
618
619
620
621
622
623
624
625
626
627
628
629
630
631
632
633
634
635
636
637
638
639
640
641
642
643
644
645
646
647
648
649
650
651
652
653
654
655
656
657
658
659
660
661
662
663
664
665
666
667
668
669
670
671
672
673
674
675
676
677
678
679
680
681
682
683
684
685
686
687
688
689
690
691
692
693
694
695
696
697
698
699
700
701
702
703
704
705
706
707
708
709
710
711
712
713
714
715
716
717
718
719
720
721
722
723
724
725
726
727
728
729
730
731
732
733
734
735
736
737
738
739
740
741
742
743
744
745
746
747
748
749
750
751
752
753
754
755
756
757
758
759
760
761
762
763
764
765
766
767
768
769
770
771
772
773
774
775
776
777
778
779
780
781
782
783
784
785
786
787
788
789
790
791
792
793
794
795
796
797
798
799
800
801
802
803
804
805
806
807
808
809
810
811
812
813
814
815
816
817
818
819
820
821
822
823
824
825
826
827
828
829
830
831
832
833
834
835
836
837
838
839
840
841
842
843
844
845
846
847
848
849
850
851
852
853
854
855
856
857
858
859
860
861
862
863
864
865
866
867
868
869
870
871
872
873
874
875
876
877
878
879
880
881
882
883
884
885
886
887
888
889
890
891
892
893
894
895
896
897
898
899
900
901
902
903
904
905
906
907
908
909
910
911
912
913
914
915
916
917
918
919
920
921
922
923
924
925
926
927
928
929
930
931
932
933
934
935
936
937
938
939
940
941
942
943
944
945
946
947
948
949
950
951
952
953
954
955
956
957
958
959
960
961
962
963
964
965
966
967
968
969
970
971
972
973
974
975
976
977
978
979
980
981
982
983
984
985
986
987
988
989
990
991
992
993
994
995
996
997
998
999
1000
1001
1002
1003
1004
1005
1006
1007
1008
1009
1010
1011
1012
1013
1014
1015
1016
1017
1018
1019
1020
1021
1022
1023
1024
1025
1026
1027
1028
1029
1030
1031
1032
1033
1034
1035
1036
1037
1038
1039
1040
1041
1042
1043
1044
1045
1046
1047
1048
1049
1050
1051
1052
1053
1054
1055
1056
1057
1058
1059
1060
1061
1062
1063
1064
1065
1066
1067
1068
1069
1070
1071
1072
1073
1074
1075
1076
1077
1078
1079
1080
1081
1082
1083
1084
1085
1086
1087
1088
1089
1090
1091
1092
1093
1094
1095
1096
1097
1098
1099
1100
1101
1102
1103
1104
1105
1106
1107
1108
1109
1110
1111
1112
1113
1114
1115
1116
1117
1118
1119
1120
1121
1122
1123
1124
1125
1126
1127
1128
1129
1130
1131
1132
1133
1134
1135
1136
1137
1138
1139
1140
1141
1142
1143
1144
1145
1146
1147
1148
1149
1150
1151
1152
1153
1154
1155
1156
1157
1158
1159
1160
1161
1162
1163
1164
1165
1166
1167
1168
1169
1170
1171
1172
1173
1174
1175
1176
1177
1178
1179
1180
1181
1182
1183
1184
1185
1186
1187
1188
1189
1190
1191
1192
1193
1194
1195
1196
1197
1198
1199
1200
1201
1202
1203
1204
1205
1206
1207
1208
1209
1210
1211
1212
1213
1214
1215
1216
1217
1218
1219
1220
1221
1222
1223
1224
1225
1226
1227
1228
1229
1230
1231
1232
1233
1234
1235
1236
1237
1238
1239
1240
1241
1242
1243
1244
1245
1246
1247
1248
1249
1250
1251
1252
1253
1254
1255
1256
1257
1258
1259
1260
1261
1262
1263
1264
1265
1266
1267
1268
1269
1270
1271
1272
1273
1274
1275
1276
1277
1278
1279
1280
1281
1282
1283
1284
1285
1286
1287
1288
1289
1290
1291
1292
1293
1294
1295
1296
1297
1298
1299
1300
1301
1302
1303
1304
1305
1306
1307
1308
1309
1310
1311
1312
1313
1314
1315
1316
1317
1318
1319
1320
1321
1322
1323
1324
1325
1326
1327
1328
1329
1330
1331
1332
1333
1334
1335
1336
#include <assert.h>
#include <stdlib.h>
#include <stdbool.h>
#include <unistd.h>
#include <string.h>
#include <errno.h>
#include <mntent.h>
#include <locale.h>
#include <sys/stat.h>
#include <sys/wait.h>
#include <sys/mount.h>

#include <talloc/talloc.h>
#include <list/list.h>
#include <log/log.h>
#include <types/types.h>
#include <system/system.h>
#include <process/process.h>
#include <url/url.h>
#include <i18n/i18n.h>

#include <sys/types.h>
#include <sys/socket.h>
#include <netdb.h>
#include <arpa/inet.h>

#include "device-handler.h"
#include "discover-server.h"
#include "user-event.h"
#include "platform.h"
#include "event.h"
#include "parser.h"
#include "resource.h"
#include "paths.h"
#include "sysinfo.h"
#include "boot.h"
#include "udev.h"
#include "network.h"
#include "ipmi.h"

enum default_priority {
	DEFAULT_PRIORITY_REMOTE		= 1,
	DEFAULT_PRIORITY_LOCAL_FIRST	= 2,
	DEFAULT_PRIORITY_LOCAL_LAST	= 0xfe,
	DEFAULT_PRIORITY_DISABLED	= 0xff,
};

struct device_handler {
	struct discover_server	*server;
	int			dry_run;

	struct pb_udev		*udev;
	struct network		*network;
	struct user_event	*user_event;

	struct discover_device	**devices;
	unsigned int		n_devices;

	struct waitset		*waitset;
	struct waiter		*timeout_waiter;
	bool			autoboot_enabled;
	unsigned int		sec_to_boot;

	struct discover_boot_option *default_boot_option;
	int			default_boot_option_priority;

	struct list		unresolved_boot_options;

	struct boot_task	*pending_boot;
	bool			pending_boot_is_default;
};

static int mount_device(struct discover_device *dev);
static int umount_device(struct discover_device *dev);

static int device_handler_init_sources(struct device_handler *handler);
static void device_handler_reinit_sources(struct device_handler *handler);

static void device_handler_update_lang(const char *lang);

void discover_context_add_boot_option(struct discover_context *ctx,
		struct discover_boot_option *boot_option)
{
	boot_option->source = ctx->parser;
	list_add_tail(&ctx->boot_options, &boot_option->list);
	talloc_steal(ctx, boot_option);
}

/**
 * device_handler_get_device_count - Get the count of current handler devices.
 */

int device_handler_get_device_count(const struct device_handler *handler)
{
	return handler->n_devices;
}

/**
 * device_handler_get_device - Get a handler device by index.
 */

const struct discover_device *device_handler_get_device(
	const struct device_handler *handler, unsigned int index)
{
	if (index >= handler->n_devices) {
		assert(0 && "bad index");
		return NULL;
	}

	return handler->devices[index];
}

struct discover_boot_option *discover_boot_option_create(
		struct discover_context *ctx,
		struct discover_device *device)
{
	struct discover_boot_option *opt;

	opt = talloc_zero(ctx, struct discover_boot_option);
	opt->option = talloc_zero(opt, struct boot_option);
	opt->device = device;

	return opt;
}

static int device_match_uuid(struct discover_device *dev, const char *uuid)
{
	return dev->uuid && !strcmp(dev->uuid, uuid);
}

static int device_match_label(struct discover_device *dev, const char *label)
{
	return dev->label && !strcmp(dev->label, label);
}

static int device_match_id(struct discover_device *dev, const char *id)
{
	return !strcmp(dev->device->id, id);
}

static int device_match_serial(struct discover_device *dev, const char *serial)
{
	const char *val = discover_device_get_param(dev, "ID_SERIAL");
	return val && !strcmp(val, serial);
}

static struct discover_device *device_lookup(
		struct device_handler *device_handler,
		int (match_fn)(struct discover_device *, const char *),
		const char *str)
{
	struct discover_device *dev;
	unsigned int i;

	if (!str)
		return NULL;

	for (i = 0; i < device_handler->n_devices; i++) {
		dev = device_handler->devices[i];

		if (match_fn(dev, str))
			return dev;
	}

	return NULL;
}

struct discover_device *device_lookup_by_name(struct device_handler *handler,
		const char *name)
{
	if (!strncmp(name, "/dev/", strlen("/dev/")))
		name += strlen("/dev/");

	return device_lookup_by_id(handler, name);
}

struct discover_device *device_lookup_by_uuid(
		struct device_handler *device_handler,
		const char *uuid)
{
	return device_lookup(device_handler, device_match_uuid, uuid);
}

struct discover_device *device_lookup_by_label(
		struct device_handler *device_handler,
		const char *label)
{
	return device_lookup(device_handler, device_match_label, label);
}

struct discover_device *device_lookup_by_id(
		struct device_handler *device_handler,
		const char *id)
{
	return device_lookup(device_handler, device_match_id, id);
}

struct discover_device *device_lookup_by_serial(
		struct device_handler *device_handler,
		const char *serial)
{
	return device_lookup(device_handler, device_match_serial, serial);
}

void device_handler_destroy(struct device_handler *handler)
{
	talloc_free(handler);
}

static int destroy_device(void *arg)
{
	struct discover_device *dev = arg;

	umount_device(dev);

	return 0;
}

struct discover_device *discover_device_create(struct device_handler *handler,
		const char *id)
{
	struct discover_device *dev;

	dev = device_lookup_by_id(handler, id);
	if (dev)
		return dev;

	dev = talloc_zero(handler, struct discover_device);
	dev->device = talloc_zero(dev, struct device);
	dev->device->id = talloc_strdup(dev->device, id);
	list_init(&dev->params);
	list_init(&dev->boot_options);

	talloc_set_destructor(dev, destroy_device);

	return dev;
}

struct discover_device_param {
	char			*name;
	char			*value;
	struct list_item	list;
};

void discover_device_set_param(struct discover_device *device,
		const char *name, const char *value)
{
	struct discover_device_param *param;
	bool found = false;

	list_for_each_entry(&device->params, param, list) {
		if (!strcmp(param->name, name)) {
			found = true;
			break;
		}
	}

	if (!found) {
		if (!value)
			return;
		param = talloc(device, struct discover_device_param);
		param->name = talloc_strdup(param, name);
		list_add(&device->params, &param->list);
	} else {
		if (!value) {
			list_remove(&param->list);
			talloc_free(param);
			return;
		}
		talloc_free(param->value);
	}

	param->value = talloc_strdup(param, value);
}

const char *discover_device_get_param(struct discover_device *device,
		const char *name)
{
	struct discover_device_param *param;

	list_for_each_entry(&device->params, param, list) {
		if (!strcmp(param->name, name))
			return param->value;
	}
	return NULL;
}

struct device_handler *device_handler_init(struct discover_server *server,
		struct waitset *waitset, int dry_run)
{
	struct device_handler *handler;
	int rc;

	handler = talloc_zero(NULL, struct device_handler);
	handler->server = server;
	handler->waitset = waitset;
	handler->dry_run = dry_run;
	handler->autoboot_enabled = config_get()->autoboot_enabled;

	list_init(&handler->unresolved_boot_options);

	/* set up our mount point base */
	pb_mkdir_recursive(mount_base());

	parser_init();

	if (config_get()->safe_mode)
		return handler;

	rc = device_handler_init_sources(handler);
	if (rc) {
		talloc_free(handler);
		return NULL;
	}

	return handler;
}

void device_handler_reinit(struct device_handler *handler)
{
	struct discover_boot_option *opt, *tmp;
	unsigned int i;

	device_handler_cancel_default(handler);

	/* free unresolved boot options */
	list_for_each_entry_safe(&handler->unresolved_boot_options,
			opt, tmp, list)
		talloc_free(opt);
	list_init(&handler->unresolved_boot_options);

	/* drop all devices */
	for (i = 0; i < handler->n_devices; i++)
		discover_server_notify_device_remove(handler->server,
				handler->devices[i]->device);

	talloc_free(handler->devices);
	handler->devices = NULL;
	handler->n_devices = 0;

	device_handler_reinit_sources(handler);
}

void device_handler_remove(struct device_handler *handler,
		struct discover_device *device)
{
	struct discover_boot_option *opt, *tmp;
	unsigned int i;

	for (i = 0; i < handler->n_devices; i++)
		if (handler->devices[i] == device)
			break;

	if (i == handler->n_devices) {
		talloc_free(device);
		return;
	}

	/* Free any unresolved options, as they're currently allocated
	 * against the handler */
	list_for_each_entry_safe(&handler->unresolved_boot_options,
			opt, tmp, list) {
		if (opt->device != device)
			continue;
		list_remove(&opt->list);
		talloc_free(opt);
	}

	/* if this is a network device, we have to unregister it from the
	 * network code */
	if (device->device->type == DEVICE_TYPE_NETWORK)
		network_unregister_device(handler->network, device);

	handler->n_devices--;
	memmove(&handler->devices[i], &handler->devices[i + 1],
		(handler->n_devices - i) * sizeof(handler->devices[0]));
	handler->devices = talloc_realloc(handler, handler->devices,
		struct discover_device *, handler->n_devices);

	if (device->notified)
		discover_server_notify_device_remove(handler->server,
							device->device);

	talloc_free(device);
}

static void boot_status(void *arg, struct boot_status *status)
{
	struct device_handler *handler = arg;

	discover_server_notify_boot_status(handler->server, status);
}

static void countdown_status(struct device_handler *handler,
		struct discover_boot_option *opt, unsigned int sec)
{
	struct boot_status status;

	status.type = BOOT_STATUS_INFO;
	status.progress = -1;
	status.detail = NULL;
	status.message = talloc_asprintf(handler,
			_("Booting in %d sec: %s"), sec, opt->option->name);

	discover_server_notify_boot_status(handler->server, &status);

	talloc_free(status.message);
}

static int default_timeout(void *arg)
{
	struct device_handler *handler = arg;
	struct discover_boot_option *opt;

	if (!handler->default_boot_option)
		return 0;

	if (handler->pending_boot)
		return 0;

	opt = handler->default_boot_option;

	if (handler->sec_to_boot) {
		countdown_status(handler, opt, handler->sec_to_boot);
		handler->sec_to_boot--;
		handler->timeout_waiter = waiter_register_timeout(
						handler->waitset, 1000,
						default_timeout, handler);
		return 0;
	}

	handler->timeout_waiter = NULL;

	pb_log("Timeout expired, booting default option %s\n", opt->option->id);

	handler->pending_boot = boot(handler, handler->default_boot_option,
			NULL, handler->dry_run, boot_status, handler);
	handler->pending_boot_is_default = true;
	return 0;
}

struct {
	enum ipmi_bootdev	ipmi_type;
	enum device_type	device_type;
} device_type_map[] = {
	{ IPMI_BOOTDEV_NETWORK, DEVICE_TYPE_NETWORK },
	{ IPMI_BOOTDEV_DISK, DEVICE_TYPE_DISK },
	{ IPMI_BOOTDEV_CDROM, DEVICE_TYPE_OPTICAL },
};

static bool ipmi_device_type_matches(enum ipmi_bootdev ipmi_type,
		enum device_type device_type)
{
	unsigned int i;

	for (i = 0; i < ARRAY_SIZE(device_type_map); i++) {
		if (device_type_map[i].device_type == device_type)
			return device_type_map[i].ipmi_type == ipmi_type;
	}

	return false;
}

static int autoboot_option_priority(const struct config *config,
				struct discover_boot_option *opt)
{
	enum device_type type = opt->device->device->type;
	const char *uuid = opt->device->uuid;
	struct autoboot_option *auto_opt;
	unsigned int i;

	for (i = 0; i < config->n_autoboot_opts; i++) {
		auto_opt = &config->autoboot_opts[i];
		if (auto_opt->boot_type == BOOT_DEVICE_UUID)
			if (!strcmp(auto_opt->uuid, uuid))
				return DEFAULT_PRIORITY_LOCAL_FIRST + i;

		if (auto_opt->boot_type == BOOT_DEVICE_TYPE)
			if (auto_opt->type == type ||
			    auto_opt->type == DEVICE_TYPE_ANY)
				return DEFAULT_PRIORITY_LOCAL_FIRST + i;
	}

	return -1;
}

/*
 * We have different priorities to resolve conflicts between boot options that
 * report to be the default for their device. This function assigns a priority
 * for these options.
 */
static enum default_priority default_option_priority(
		struct discover_boot_option *opt)
{
	const struct config *config;

	config = config_get();

	/* We give highest priority to IPMI-configured boot options. If
	 * we have an IPMI bootdev configuration set, then we don't allow
	 * any other defaults */
	if (config->ipmi_bootdev) {
		bool ipmi_match = ipmi_device_type_matches(config->ipmi_bootdev,
				opt->device->device->type);
		if (ipmi_match)
			return DEFAULT_PRIORITY_REMOTE;

		pb_debug("handler: disabled default priority due to "
				"non-matching IPMI type %x\n",
				config->ipmi_bootdev);
		return DEFAULT_PRIORITY_DISABLED;
	}

	/* Next, try to match the option against the user-defined autoboot
	 * options, either by device UUID or type. */
	if (config->n_autoboot_opts) {
		int boot_match = autoboot_option_priority(config, opt);
		if (boot_match > 0)
			return boot_match;
	}

	/* If the option didn't match any entry in the array, it is disabled */
	pb_debug("handler: disabled default priority due to "
			"non-matching UUID or type\n");
	return DEFAULT_PRIORITY_DISABLED;
}

static void set_default(struct device_handler *handler,
		struct discover_boot_option *opt)
{
	enum default_priority cur_prio, new_prio;

	if (!handler->autoboot_enabled)
		return;

	pb_debug("handler: new default option: %s\n", opt->option->id);

	new_prio = default_option_priority(opt);

	/* Anything outside our range prevents a default boot */
	if (new_prio >= DEFAULT_PRIORITY_DISABLED)
		return;

	pb_debug("handler: calculated priority %d\n", new_prio);

	/* Resolve any conflicts: if we have a new default option, it only
	 * replaces the current if it has a higher priority. */
	if (handler->default_boot_option) {

		cur_prio = handler->default_boot_option_priority;

		if (new_prio < cur_prio) {
			pb_log("handler: new prio %d beats "
					"old prio %d for %s\n",
					new_prio, cur_prio,
					handler->default_boot_option
						->option->id);
			handler->default_boot_option = opt;
			handler->default_boot_option_priority = new_prio;
			/* extend the timeout a little, so the user sees some
			 * indication of the change */
			handler->sec_to_boot += 2;
		}

		return;
	}

	handler->sec_to_boot = config_get()->autoboot_timeout_sec;
	handler->default_boot_option = opt;
	handler->default_boot_option_priority = new_prio;

	pb_log("handler: boot option %s set as default, timeout %u sec.\n",
	       opt->option->id, handler->sec_to_boot);

	default_timeout(handler);
}

static bool resource_is_resolved(struct resource *res)
{
	return !res || res->resolved;
}

/* We only use this in an assert, which will disappear if we're compiling
 * with NDEBUG, so we need the 'used' attribute for these builds */
static bool __attribute__((used)) boot_option_is_resolved(
		struct discover_boot_option *opt)
{
	return resource_is_resolved(opt->boot_image) &&
		resource_is_resolved(opt->initrd) &&
		resource_is_resolved(opt->dtb) &&
		resource_is_resolved(opt->icon);
}

static bool resource_resolve(struct resource *res, const char *name,
		struct discover_boot_option *opt,
		struct device_handler *handler)
{
	struct parser *parser = opt->source;

	if (resource_is_resolved(res))
		return true;

	pb_debug("Attempting to resolve resource %s->%s with parser %s\n",
			opt->option->id, name, parser->name);
	parser->resolve_resource(handler, res);

	return res->resolved;
}

static bool boot_option_resolve(struct discover_boot_option *opt,
		struct device_handler *handler)
{
	return resource_resolve(opt->boot_image, "boot_image", opt, handler) &&
		resource_resolve(opt->initrd, "initrd", opt, handler) &&
		resource_resolve(opt->dtb, "dtb", opt, handler) &&
		resource_resolve(opt->icon, "icon", opt, handler);
}

static void boot_option_finalise(struct device_handler *handler,
		struct discover_boot_option *opt)
{
	assert(boot_option_is_resolved(opt));

	/* check that the parsers haven't set any of the final data */
	assert(!opt->option->boot_image_file);
	assert(!opt->option->initrd_file);
	assert(!opt->option->dtb_file);
	assert(!opt->option->icon_file);
	assert(!opt->option->device_id);

	if (opt->boot_image)
		opt->option->boot_image_file = opt->boot_image->url->full;
	if (opt->initrd)
		opt->option->initrd_file = opt->initrd->url->full;
	if (opt->dtb)
		opt->option->dtb_file = opt->dtb->url->full;
	if (opt->icon)
		opt->option->icon_file = opt->icon->url->full;

	opt->option->device_id = opt->device->device->id;

	if (opt->option->is_default)
		set_default(handler, opt);
}

static void notify_boot_option(struct device_handler *handler,
		struct discover_boot_option *opt)
{
	struct discover_device *dev = opt->device;

	if (!dev->notified)
		discover_server_notify_device_add(handler->server,
						  opt->device->device);
	dev->notified = true;
	discover_server_notify_boot_option_add(handler->server, opt->option);
}

static void process_boot_option_queue(struct device_handler *handler)
{
	struct discover_boot_option *opt, *tmp;

	list_for_each_entry_safe(&handler->unresolved_boot_options,
			opt, tmp, list) {

		pb_debug("queue: attempting resolution for %s\n",
				opt->option->id);

		if (!boot_option_resolve(opt, handler))
			continue;

		pb_debug("\tresolved!\n");

		list_remove(&opt->list);
		list_add_tail(&opt->device->boot_options, &opt->list);
		talloc_steal(opt->device, opt);
		boot_option_finalise(handler, opt);
		notify_boot_option(handler, opt);
	}
}

struct discover_context *device_handler_discover_context_create(
		struct device_handler *handler,
		struct discover_device *device)
{
	struct discover_context *ctx;

	ctx = talloc_zero(handler, struct discover_context);
	ctx->device = device;
	ctx->network = handler->network;
	list_init(&ctx->boot_options);

	return ctx;
}

/**
 * context_commit - Commit a temporary discovery context to the handler,
 * and notify the clients about any new options / devices
 */
void device_handler_discover_context_commit(struct device_handler *handler,
		struct discover_context *ctx)
{
	struct discover_device *dev = ctx->device;
	struct discover_boot_option *opt, *tmp;

	if (!device_lookup_by_id(handler, dev->device->id))
		device_handler_add_device(handler, dev);

	/* move boot options from the context to the device */
	list_for_each_entry_safe(&ctx->boot_options, opt, tmp, list) {
		list_remove(&opt->list);

		if (boot_option_resolve(opt, handler)) {
			pb_log("boot option %s is resolved, "
					"sending to clients\n",
					opt->option->id);
			list_add_tail(&dev->boot_options, &opt->list);
			talloc_steal(dev, opt);
			boot_option_finalise(handler, opt);
			notify_boot_option(handler, opt);
		} else {
			if (!opt->source->resolve_resource) {
				pb_log("parser %s gave us an unresolved "
					"resource (%s), but no way to "
					"resolve it\n",
					opt->source->name, opt->option->id);
				talloc_free(opt);
			} else {
				pb_log("boot option %s is unresolved, "
						"adding to queue\n",
						opt->option->id);
				list_add(&handler->unresolved_boot_options,
						&opt->list);
				talloc_steal(handler, opt);
			}
		}
	}
}

void device_handler_add_device(struct device_handler *handler,
		struct discover_device *device)
{
	handler->n_devices++;
	handler->devices = talloc_realloc(handler, handler->devices,
				struct discover_device *, handler->n_devices);
	handler->devices[handler->n_devices - 1] = device;

	if (device->device->type == DEVICE_TYPE_NETWORK)
		network_register_device(handler->network, device);
}

/* Start discovery on a hotplugged device. The device will be in our devices
 * array, but has only just been initialised by the hotplug source.
 */
int device_handler_discover(struct device_handler *handler,
		struct discover_device *dev)
{
	struct discover_context *ctx;
	int rc;

	process_boot_option_queue(handler);

	/* create our context */
	ctx = device_handler_discover_context_create(handler, dev);

	rc = mount_device(dev);
	if (rc)
		goto out;

	/* add this device to our system info */
	system_info_register_blockdev(dev->device->id, dev->uuid,
			dev->mount_path);

	/* run the parsers. This will populate the ctx's boot_option list. */
	iterate_parsers(ctx);

	/* add discovered stuff to the handler */
	device_handler_discover_context_commit(handler, ctx);

out:
	talloc_free(ctx);

	return 0;
}

/* Incoming dhcp event */
int device_handler_dhcp(struct device_handler *handler,
		struct discover_device *dev, struct event *event)
{
	struct discover_context *ctx;

	/* create our context */
	ctx = device_handler_discover_context_create(handler, dev);
	ctx->event = event;

	iterate_parsers(ctx);

	device_handler_discover_context_commit(handler, ctx);

	talloc_free(ctx);

	return 0;
}

/* incoming conf event */
int device_handler_conf(struct device_handler *handler,
		struct discover_device *dev, struct pb_url *url)
{
        struct discover_context *ctx;

        /* create our context */
        ctx = device_handler_discover_context_create(handler, dev);
        ctx->conf_url = url;

        iterate_parsers(ctx);

        device_handler_discover_context_commit(handler, ctx);

        talloc_free(ctx);

        return 0;
}

static struct discover_boot_option *find_boot_option_by_id(
		struct device_handler *handler, const char *id)
{
	unsigned int i;

	for (i = 0; i < handler->n_devices; i++) {
		struct discover_device *dev = handler->devices[i];
		struct discover_boot_option *opt;

		list_for_each_entry(&dev->boot_options, opt, list)
			if (!strcmp(opt->option->id, id))
				return opt;
	}

	return NULL;
}

void device_handler_boot(struct device_handler *handler,
		struct boot_command *cmd)
{
	struct discover_boot_option *opt = NULL;

	if (cmd->option_id && strlen(cmd->option_id))
		opt = find_boot_option_by_id(handler, cmd->option_id);

	if (handler->pending_boot)
		boot_cancel(handler->pending_boot);

	platform_pre_boot();

	handler->pending_boot = boot(handler, opt, cmd, handler->dry_run,
			boot_status, handler);
	handler->pending_boot_is_default = false;
}

void device_handler_cancel_default(struct device_handler *handler)
{
	struct boot_status status;

	if (handler->timeout_waiter)
		waiter_remove(handler->timeout_waiter);

	handler->timeout_waiter = NULL;
	handler->autoboot_enabled = false;

	/* we only send status if we had a default boot option queued */
	if (!handler->default_boot_option)
		return;

	pb_log("Cancelling default boot option\n");

	if (handler->pending_boot && handler->pending_boot_is_default) {
		boot_cancel(handler->pending_boot);
		handler->pending_boot = NULL;
		handler->pending_boot_is_default = false;
	}

	handler->default_boot_option = NULL;

	status.type = BOOT_STATUS_INFO;
	status.progress = -1;
	status.detail = NULL;
	status.message = _("Default boot cancelled");

	discover_server_notify_boot_status(handler->server, &status);
}

void device_handler_update_config(struct device_handler *handler,
		struct config *config)
{
	int rc;

	rc = config_set(config);
	if (rc)
		return;

	discover_server_notify_config(handler->server, config);
	device_handler_update_lang(config->lang);
	device_handler_reinit(handler);
}

static char *device_from_addr(void *ctx, struct pb_url *url)
{
	char *ipaddr, *buf, *tok, *dev = NULL;
	const char *delim = " ";
	struct sockaddr_in *ip;
	struct sockaddr_in si;
	struct addrinfo *res;
	struct process *p;
	int rc;

	/* Note: IPv4 only */
	rc = inet_pton(AF_INET, url->host, &(si.sin_addr));
	if (rc > 0) {
		ipaddr = url->host;
	} else {
		/* need to turn hostname into a valid IP */
		rc = getaddrinfo(url->host, NULL, NULL, &res);
		if (rc) {
			pb_debug("%s: Invalid URL\n",__func__);
			return NULL;
		}
		ipaddr = talloc_array(ctx,char,INET_ADDRSTRLEN);
		ip = (struct sockaddr_in *) res->ai_addr;
		inet_ntop(AF_INET, &(ip->sin_addr), ipaddr, INET_ADDRSTRLEN);
		freeaddrinfo(res);
	}

	const char *argv[] = {
		pb_system_apps.ip,
		"route", "show", "to", "match",
		ipaddr,
		NULL
	};

	p = process_create(ctx);

	p->path = pb_system_apps.ip;
	p->argv = argv;
	p->keep_stdout = true;

	rc = process_run_sync(p);

	if (rc) {
		/* ip has complained for some reason; most likely
		 * there is no route to the host - bail out */
		pb_debug("%s: No route to %s\n",__func__,url->host);
		return NULL;
	}

	buf = p->stdout_buf;
	/* If a route is found, ip-route output will be of the form
	 * "... dev DEVNAME ... " */
	tok = strtok(buf, delim);
	while (tok) {
		if (!strcmp(tok, "dev")) {
			tok = strtok(NULL, delim);
			dev = talloc_strdup(ctx, tok);
			break;
		}
		tok = strtok(NULL, delim);
	}

	process_release(p);
	if (dev)
		pb_debug("%s: Found interface '%s'\n", __func__,dev);
	return dev;
}


void device_handler_process_url(struct device_handler *handler,
		const char *url)
{
	struct discover_context *ctx;
	struct discover_device *dev;
	struct boot_status *status;
	struct pb_url *pb_url;
	struct event *event;
	struct param *param;

	status = talloc(handler, struct boot_status);

	status->type = BOOT_STATUS_ERROR;
	status->progress = 0;
	status->detail = talloc_asprintf(status,
			_("Received config URL %s"), url);

	if (!handler->network) {
		status->message = talloc_asprintf(handler,
					_("No network configured"));
		goto msg;
	}

	event = talloc(handler, struct event);
	event->type = EVENT_TYPE_USER;
	event->action = EVENT_ACTION_CONF;

	event->params = talloc_array(event, struct param, 1);
	param = &event->params[0];
	param->name = talloc_strdup(event, "pxeconffile");
	param->value = talloc_strdup(event, url);
	event->n_params = 1;

	pb_url = pb_url_parse(event, event->params->value);
	if (!pb_url || !pb_url->host) {
		status->message = talloc_asprintf(handler,
					_("Invalid config URL!"));
		goto msg;
	}

	event->device = device_from_addr(event, pb_url);
	if (!event->device) {
		status->message = talloc_asprintf(status,
					_("Unable to route to host %s"),
					pb_url->host);
		goto msg;
	}

	dev = discover_device_create(handler, event->device);
	ctx = device_handler_discover_context_create(handler, dev);
	ctx->event = event;

	iterate_parsers(ctx);

	device_handler_discover_context_commit(handler, ctx);

	talloc_free(ctx);

	status->type = BOOT_STATUS_INFO;
	status->message = talloc_asprintf(status, _("Config file %s parsed"),
					pb_url->file);
msg:
	boot_status(handler, status);
	talloc_free(status);
}

#ifndef PETITBOOT_TEST

static void device_handler_update_lang(const char *lang)
{
	const char *cur_lang;

	if (!lang)
		return;

	cur_lang = setlocale(LC_ALL, NULL);
	if (cur_lang && !strcmp(cur_lang, lang))
		return;

	setlocale(LC_ALL, lang);
}

static int device_handler_init_sources(struct device_handler *handler)
{
	/* init our device sources: udev, network and user events */
	handler->udev = udev_init(handler, handler->waitset);
	if (!handler->udev)
		return -1;

	handler->network = network_init(handler, handler->waitset,
			handler->dry_run);
	if (!handler->network)
		return -1;

	handler->user_event = user_event_init(handler, handler->waitset);
	if (!handler->user_event)
		return -1;

	return 0;
}

static void device_handler_reinit_sources(struct device_handler *handler)
{
	/* if we haven't initialised sources previously (becuase we started in
	 * safe mode), then init once here. */
	if (!(handler->udev || handler->network || handler->user_event)) {
		device_handler_init_sources(handler);
		return;
	}

	udev_reinit(handler->udev);

	network_shutdown(handler->network);
	handler->network = network_init(handler, handler->waitset,
			handler->dry_run);
}

static const char *fs_parameters(unsigned int rw_flags, const char *fstype)
{
	if ((rw_flags | MS_RDONLY) != MS_RDONLY)
		return "";

	/* Avoid writing back to the disk on journaled filesystems */
	if (!strncmp(fstype, "ext4", strlen("ext4")))
		return "norecovery";
	if (!strncmp(fstype, "xfs", strlen("xfs")))
		return "norecovery";

	return "";
}

static bool check_existing_mount(struct discover_device *dev)
{
	struct stat devstat, mntstat;
	struct mntent *mnt;
	FILE *fp;
	int rc;

	rc = stat(dev->device_path, &devstat);
	if (rc) {
		pb_debug("%s: stat failed: %s\n", __func__, strerror(errno));
		return false;
	}

	if (!S_ISBLK(devstat.st_mode)) {
		pb_debug("%s: %s isn't a block device?\n", __func__,
				dev->device_path);
		return false;
	}

	fp = fopen("/proc/self/mounts", "r");

	for (;;) {
		mnt = getmntent(fp);
		if (!mnt)
			break;

		if (!mnt->mnt_fsname || mnt->mnt_fsname[0] != '/')
			continue;

		rc = stat(mnt->mnt_fsname, &mntstat);
		if (rc)
			continue;

		if (!S_ISBLK(mntstat.st_mode))
			continue;

		if (mntstat.st_rdev == devstat.st_rdev) {
			dev->mount_path = talloc_strdup(dev, mnt->mnt_dir);
			dev->mounted_rw = !!hasmntopt(mnt, "rw");
			dev->mounted = true;
			dev->unmount = false;

			pb_debug("%s: %s is already mounted (r%c) at %s\n",
					__func__, dev->device_path,
					dev->mounted_rw ? 'w' : 'o',
					mnt->mnt_dir);
			break;
		}
	}

	fclose(fp);

	return mnt != NULL;
}

static int mount_device(struct discover_device *dev)
{
	const char *fstype;
	int rc;

	if (!dev->device_path)
		return -1;

	if (dev->mounted)
		return 0;

	if (check_existing_mount(dev))
		return 0;

	fstype = discover_device_get_param(dev, "ID_FS_TYPE");
	if (!fstype)
		return 0;

	/* ext3 treats the norecovery option as an error, so mount the device
	 * as an ext4 filesystem instead */
	if (!strncmp(fstype, "ext3", strlen("ext3"))) {
		pb_debug("Mounting ext3 filesystem as ext4\n");
		fstype = talloc_asprintf(dev, "ext4");
	}

	dev->mount_path = join_paths(dev, mount_base(),
					dev->device_path);

	if (pb_mkdir_recursive(dev->mount_path)) {
		pb_log("couldn't create mount directory %s: %s\n",
				dev->mount_path, strerror(errno));
		goto err_free;
	}

	pb_log("mounting device %s read-only\n", dev->device_path);
	errno = 0;
	rc = mount(dev->device_path, dev->mount_path, fstype,
			MS_RDONLY | MS_SILENT,
			fs_parameters(MS_RDONLY, fstype));
	if (!rc) {
		dev->mounted = true;
		dev->mounted_rw = false;
		dev->unmount = true;
		return 0;
	}

	pb_log("couldn't mount device %s: mount failed: %s\n",
			dev->device_path, strerror(errno));

	pb_rmdir_recursive(mount_base(), dev->mount_path);
err_free:
	talloc_free(dev->mount_path);
	dev->mount_path = NULL;
	return -1;
}

static int umount_device(struct discover_device *dev)
{
	int rc;

	if (!dev->mounted || !dev->unmount)
		return 0;

	pb_log("unmounting device %s\n", dev->device_path);
	rc = umount(dev->mount_path);
	if (rc)
		return -1;

	dev->mounted = false;

	pb_rmdir_recursive(mount_base(), dev->mount_path);

	talloc_free(dev->mount_path);
	dev->mount_path = NULL;

	return 0;
}

int device_request_write(struct discover_device *dev, bool *release)
{
	const char *fstype;
	int rc;

	*release = false;

	if (!dev->mounted)
		return -1;

	if (dev->mounted_rw)
		return 0;

	fstype = discover_device_get_param(dev, "ID_FS_TYPE");

	pb_log("remounting device %s read-write\n", dev->device_path);

	rc = umount(dev->mount_path);
	if (rc) {
		pb_log("Failed to unmount %s\n", dev->mount_path);
		return -1;
	}
	rc = mount(dev->device_path, dev->mount_path, fstype,
			MS_SILENT,
			fs_parameters(MS_REMOUNT, fstype));
	if (rc)
		goto mount_ro;

	dev->mounted_rw = true;
	*release = true;
	return 0;

mount_ro:
	pb_log("Unable to remount device %s read-write\n", dev->device_path);
	rc = mount(dev->device_path, dev->mount_path, fstype,
			MS_RDONLY | MS_SILENT,
			fs_parameters(MS_RDONLY, fstype));
	if (rc)
		pb_log("Unable to recover mount for %s\n", dev->device_path);
	return -1;
}

void device_release_write(struct discover_device *dev, bool release)
{
	const char *fstype;

	if (!release)
		return;

	fstype = discover_device_get_param(dev, "ID_FS_TYPE");

	pb_log("remounting device %s read-only\n", dev->device_path);
	mount(dev->device_path, dev->mount_path, "",
			MS_REMOUNT | MS_RDONLY | MS_SILENT,
			fs_parameters(MS_RDONLY, fstype));
	dev->mounted_rw = false;
}

#else

static void device_handler_update_lang(const char *lang __attribute__((unused)))
{
}

static int device_handler_init_sources(
		struct device_handler *handler __attribute__((unused)))
{
	return 0;
}

static void device_handler_reinit_sources(
		struct device_handler *handler __attribute__((unused)))
{
}

static int umount_device(struct discover_device *dev __attribute__((unused)))
{
	return 0;
}

static int __attribute__((unused)) mount_device(
		struct discover_device *dev __attribute__((unused)))
{
	return 0;
}

int device_request_write(struct discover_device *dev __attribute__((unused)),
		bool *release)
{
	*release = true;
	return 0;
}

void device_release_write(struct discover_device *dev __attribute__((unused)),
	bool release __attribute__((unused)))
{
}

#endif

OpenPOWER on IntegriCloud