summaryrefslogtreecommitdiffstats
path: root/src/libusbmuxd.c
blob: 785da8ba760fbe13ce4fe29a3db839ec53752a7e (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
1337
1338
1339
1340
1341
1342
1343
1344
1345
1346
1347
1348
1349
1350
1351
1352
1353
1354
1355
1356
1357
1358
1359
1360
1361
1362
1363
1364
1365
1366
1367
1368
1369
1370
1371
1372
1373
1374
1375
1376
1377
1378
1379
1380
1381
1382
1383
1384
1385
1386
1387
1388
1389
1390
1391
1392
1393
1394
1395
1396
1397
1398
1399
1400
1401
1402
1403
1404
1405
1406
1407
1408
1409
1410
1411
1412
1413
1414
1415
1416
1417
1418
1419
1420
1421
1422
1423
1424
1425
1426
1427
1428
1429
1430
1431
1432
1433
1434
1435
1436
1437
1438
1439
1440
1441
1442
1443
1444
1445
1446
1447
1448
1449
1450
1451
1452
1453
1454
1455
1456
1457
1458
1459
1460
1461
1462
1463
1464
1465
1466
1467
1468
1469
1470
1471
1472
1473
1474
1475
1476
1477
1478
1479
1480
1481
1482
1483
1484
1485
1486
1487
1488
1489
1490
1491
1492
1493
1494
1495
1496
1497
1498
1499
1500
1501
1502
1503
1504
1505
1506
1507
1508
1509
1510
1511
1512
1513
1514
1515
1516
1517
1518
1519
1520
1521
1522
1523
1524
1525
1526
1527
1528
1529
1530
1531
1532
1533
1534
1535
1536
1537
1538
1539
1540
1541
1542
1543
1544
1545
1546
1547
1548
1549
1550
1551
1552
1553
1554
1555
1556
1557
1558
1559
1560
1561
1562
1563
1564
1565
1566
1567
1568
1569
1570
1571
1572
1573
1574
1575
1576
1577
1578
1579
1580
1581
1582
1583
1584
1585
1586
1587
1588
1589
1590
1591
1592
1593
1594
1595
1596
1597
1598
1599
1600
1601
1602
1603
1604
1605
1606
1607
1608
1609
1610
1611
1612
1613
1614
1615
1616
1617
1618
1619
1620
1621
1622
1623
1624
1625
1626
1627
1628
1629
1630
1631
1632
1633
1634
1635
1636
1637
1638
1639
1640
1641
1642
1643
1644
1645
1646
1647
1648
1649
1650
1651
1652
1653
1654
1655
1656
1657
1658
1659
1660
1661
1662
1663
1664
1665
1666
1667
1668
1669
1670
1671
1672
1673
1674
1675
1676
1677
1678
1679
1680
1681
1682
1683
1684
1685
1686
1687
1688
1689
1690
1691
1692
1693
1694
1695
1696
1697
1698
1699
1700
1701
1702
1703
1704
1705
1706
1707
1708
1709
1710
1711
1712
1713
1714
1715
1716
1717
1718
1719
1720
1721
1722
1723
1724
1725
1726
1727
1728
1729
1730
1731
1732
1733
1734
1735
1736
1737
1738
1739
1740
1741
1742
1743
1744
1745
1746
1747
1748
1749
1750
1751
1752
1753
1754
1755
1756
1757
1758
1759
1760
1761
1762
1763
1764
1765
1766
1767
1768
1769
1770
1771
1772
1773
1774
1775
1776
1777
1778
1779
1780
1781
1782
1783
1784
1785
1786
1787
1788
1789
1790
1791
1792
1793
1794
1795
1796
1797
/*
 * libusbmuxd.c
 *
 * Copyright (C) 2009-2019 Nikias Bassen <nikias@gmx.li>
 * Copyright (C) 2009-2014 Martin Szulecki <m.szulecki@libimobiledevice.org>
 * Copyright (C) 2009 Paul Sladen <libiphone@paul.sladen.org>
 *
 * This library is free software; you can redistribute it and/or
 * modify it under the terms of the GNU Lesser General Public
 * License as published by the Free Software Foundation; either
 * version 2.1 of the License, or (at your option) any later version.
 *
 * This library 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
 * Lesser General Public License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public
 * License along with this library; if not, write to the Free Software
 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301  USA
 */

#ifdef HAVE_CONFIG_H
#include <config.h>
#endif
#include <stdint.h>
#include <stdlib.h>
#include <errno.h>
#include <stdio.h>
#include <string.h>

#ifdef WIN32
  #define USBMUXD_API __declspec( dllexport )
#else
  #ifdef HAVE_FVISIBILITY
    #define USBMUXD_API __attribute__((visibility("default")))
  #else
    #define USBMUXD_API
  #endif
#endif

#ifndef EPROTO
#define EPROTO 134
#endif
#ifndef EBADMSG
#define EBADMSG 104
#endif
#ifndef ECONNREFUSED
#define ECONNREFUSED 107
#endif

#include <unistd.h>
#include <signal.h>

#ifdef WIN32
#include <winsock2.h>
#include <windows.h>
#ifndef HAVE_SLEEP
#define sleep(x) Sleep(x*1000)
#endif
#else
#include <sys/socket.h>
#include <arpa/inet.h>
#include <pthread.h>
#if defined(HAVE_PROGRAM_INVOCATION_SHORT_NAME) && !defined(HAVE_PROGRAM_INVOCATION_SHORT_NAME_ERRNO_H)
extern char *program_invocation_short_name;
#endif
#ifdef __APPLE__
extern int _NSGetExecutablePath(char* buf, uint32_t* bufsize);
#include <sys/stat.h>
#endif
#endif

#ifdef HAVE_INOTIFY
#include <sys/inotify.h>
#include <sys/select.h>
#define EVENT_SIZE  (sizeof (struct inotify_event))
#define EVENT_BUF_LEN (1024 * (EVENT_SIZE + 16))
#define USBMUXD_DIRNAME "/var/run"
#define USBMUXD_SOCKET_NAME "usbmuxd"
static int use_inotify = 1;
#endif /* HAVE_INOTIFY */

#ifndef HAVE_STPNCPY
static char* stpncpy(char *dst, const char *src, size_t len)
{
	size_t n = strlen(src);
	if (n > len)
		n = len;
	return strncpy(dst, src, len) + n;
}
#endif

#include <plist/plist.h>
#define PLIST_CLIENT_VERSION_STRING PACKAGE_STRING
#define PLIST_LIBUSBMUX_VERSION 3

static char *bundle_id = NULL;
static char *prog_name = NULL;

// usbmuxd public interface
#include "usbmuxd.h"
// usbmuxd protocol
#include "usbmuxd-proto.h"
// socket utility functions
#include "socket.h"
// misc utility functions
#include "collection.h"
// threads
#include "thread.h"

static int libusbmuxd_debug = 0;
#ifndef PACKAGE
#define PACKAGE "libusbmuxd"
#endif
#define LIBUSBMUXD_DEBUG(level, format, ...) if (level <= libusbmuxd_debug) fprintf(stderr, ("[" PACKAGE "] " format), __VA_ARGS__); fflush(stderr);
#define LIBUSBMUXD_ERROR(format, ...) LIBUSBMUXD_DEBUG(0, format, __VA_ARGS__)

static struct collection devices;
static THREAD_T devmon = THREAD_T_NULL;
static int listenfd = -1;
static int running = 0;
static int cancelling = 0;

static volatile int use_tag = 0;
static volatile int proto_version = 1;
static volatile int try_list_devices = 1;

struct usbmuxd_subscription_context {
	usbmuxd_event_cb_t callback;
	void *user_data;
};

static struct usbmuxd_subscription_context *event_ctx = NULL;

static struct collection listeners;
thread_once_t listener_init_once = THREAD_ONCE_INIT;
mutex_t listener_mutex;

/**
 * Finds a device info record by its handle.
 * if the record is not found, NULL is returned.
 */
static usbmuxd_device_info_t *devices_find(uint32_t handle)
{
	FOREACH(usbmuxd_device_info_t *dev, &devices) {
		if (dev && dev->handle == handle) {
			return dev;
		}
	} ENDFOREACH
	return NULL;
}

/**
 * Creates a socket connection to usbmuxd.
 * For Mac/Linux it is a unix domain socket,
 * for Windows it is a tcp socket.
 */
static int connect_usbmuxd_socket()
{
	char *usbmuxd_socket_addr = getenv("USBMUXD_SOCKET_ADDRESS");
	if (usbmuxd_socket_addr) {
		if (strncmp(usbmuxd_socket_addr, "UNIX:", 5) == 0) {
#if defined(WIN32) || defined(__CYGWIN__)
			/* not supported, ignore */
#else
			if (usbmuxd_socket_addr[5] != '\0') {
				return socket_connect_unix(usbmuxd_socket_addr+5);
			}
#endif
		} else {
			uint16_t port = 0;
			char *p = strrchr(usbmuxd_socket_addr, ':');
			if (p) {
				char *endp = NULL;
				long l_port = strtol(p+1, &endp, 10);
				if (endp && *endp == '\0') {
					if (l_port > 0 && l_port < 65536) {
						port = (uint16_t)l_port;
					}
				}
			}
			if (p && port > 0) {
				char *connect_addr = NULL;
				if (usbmuxd_socket_addr[0] == '[') {
					connect_addr = strdup(usbmuxd_socket_addr+1);
					connect_addr[p - usbmuxd_socket_addr - 1] = '\0';
					p = strrchr(connect_addr, ']');
					if (p) {
						*p = '\0';
					}
				} else {
					connect_addr = strdup(usbmuxd_socket_addr);
					connect_addr[p - usbmuxd_socket_addr] = '\0';
				}
				if (connect_addr && *connect_addr != '\0') {
					int res = socket_connect(connect_addr, port);
#ifdef HAVE_INOTIFY
					use_inotify = 0;
#endif
					free(connect_addr);
					return res;
				}
				free(connect_addr);
			}
		}
	}
#if defined(WIN32) || defined(__CYGWIN__)
	return socket_connect("127.0.0.1", USBMUXD_SOCKET_PORT);
#else
	return socket_connect_unix(USBMUXD_SOCKET_FILE);
#endif
}

static void sanitize_udid(usbmuxd_device_info_t *devinfo)
{
	if (!devinfo)
		return;
	if (strlen(devinfo->udid) == 24) {
		memmove(&devinfo->udid[9], &devinfo->udid[8], 17);
		devinfo->udid[8] = '-';
	}
	if (strcasecmp(devinfo->udid, "ffffffffffffffffffffffffffffffffffffffff") == 0) {
		sprintf(devinfo->udid + 32, "%08x", devinfo->handle);
	}
}

static usbmuxd_device_info_t *device_info_from_plist(plist_t props)
{
	usbmuxd_device_info_t* devinfo = NULL;
	plist_t n = NULL;
	uint64_t val = 0;
	char *strval = NULL;

	devinfo = (usbmuxd_device_info_t*)malloc(sizeof(usbmuxd_device_info_t));
	if (!devinfo)
		return NULL;
	memset(devinfo, 0, sizeof(usbmuxd_device_info_t));

	n = plist_dict_get_item(props, "DeviceID");
	if (n && plist_get_node_type(n) == PLIST_UINT) {
		plist_get_uint_val(n, &val);
		devinfo->handle = (uint32_t)val;
	}

	n = plist_dict_get_item(props, "ProductID");
	if (n && plist_get_node_type(n) == PLIST_UINT) {
		plist_get_uint_val(n, &val);
		devinfo->product_id = (uint32_t)val;
	}

	n = plist_dict_get_item(props, "SerialNumber");
	if (n && plist_get_node_type(n) == PLIST_STRING) {
		plist_get_string_val(n, &strval);
		if (strval) {
			char *t = stpncpy(devinfo->udid, strval, sizeof(devinfo->udid)-1);
			*t = '\0';
			sanitize_udid(devinfo);
			free(strval);
		}
	}

	n = plist_dict_get_item(props, "ConnectionType");
	if (n && plist_get_node_type(n) == PLIST_STRING) {
		plist_get_string_val(n, &strval);
		if (strval) {
			if (strcmp(strval, "USB") == 0) {
				devinfo->conn_type = CONNECTION_TYPE_USB;
			} else if (strcmp(strval, "Network") == 0) {
				devinfo->conn_type = CONNECTION_TYPE_NETWORK;
				n = plist_dict_get_item(props, "NetworkAddress");
				if (n && plist_get_node_type(n) == PLIST_DATA) {
					char *netaddr = NULL;
					uint64_t addr_len = 0;
					plist_get_data_val(n, &netaddr, &addr_len);
					if (netaddr && addr_len > 0 && addr_len < sizeof(devinfo->conn_data)) {
						memcpy(devinfo->conn_data, netaddr, addr_len);
					}
					free(netaddr);
				}
			} else {
				LIBUSBMUXD_ERROR("%s: Unexpected ConnectionType '%s'\n", __func__, strval);
			}
			free(strval);
		}
	}

	if (!devinfo->udid[0]) {
		LIBUSBMUXD_ERROR("%s: Failed to get SerialNumber (UDID)!\n", __func__);
		free(devinfo);
		return NULL;
	}
	if (!devinfo->conn_type) {
		LIBUSBMUXD_ERROR("%s: Failed to get ConnectionType!\n", __func__);
		free(devinfo);
		devinfo = NULL;
	} else if (devinfo->conn_type == CONNECTION_TYPE_NETWORK && !devinfo->conn_data[0]) {
		LIBUSBMUXD_ERROR("%s: Failed to get EscapedFullServiceName!\n", __func__);
		free(devinfo);
		devinfo = NULL;
	}

	return devinfo;
}

static usbmuxd_device_info_t *device_info_from_device_record(struct usbmuxd_device_record *dev)
{
	if (!dev) {
		return NULL;
	}
	usbmuxd_device_info_t *devinfo = (usbmuxd_device_info_t*)malloc(sizeof(usbmuxd_device_info_t));
	if (!devinfo) {
		LIBUSBMUXD_ERROR("%s: Out of memory while allocating device info object\n", __func__);
		return NULL;
	}

	devinfo->handle = dev->device_id;
	devinfo->product_id = dev->product_id;
	char *t = stpncpy(devinfo->udid, dev->serial_number, sizeof(devinfo->udid)-2);
	*t = '\0';
	sanitize_udid(devinfo);

	return devinfo;
}

static int receive_packet(int sfd, struct usbmuxd_header *header, void **payload, int timeout)
{
	int recv_len;
	struct usbmuxd_header hdr;
	char *payload_loc = NULL;

	header->length = 0;
	header->version = 0;
	header->message = 0;
	header->tag = 0;

	recv_len = socket_receive_timeout(sfd, &hdr, sizeof(hdr), 0, timeout);
	if (recv_len < 0) {
		if (!cancelling) {
			LIBUSBMUXD_DEBUG(1, "%s: Error receiving packet: %s\n", __func__, strerror(-recv_len));
		}
		return recv_len;
	}

	if ((size_t)recv_len < sizeof(hdr)) {
		LIBUSBMUXD_DEBUG(1, "%s: Received packet is too small, got %d bytes!\n", __func__, recv_len);
		return recv_len;
	}

	uint32_t payload_size = hdr.length - sizeof(hdr);
	if (payload_size > 0) {
		payload_loc = (char*)malloc(payload_size);
		uint32_t rsize = 0;
		do {
			int res = socket_receive_timeout(sfd, payload_loc + rsize, payload_size - rsize, 0, 5000);
			if (res < 0) {
				break;
			}
			rsize += res;
		} while (rsize < payload_size);
		if (rsize != payload_size) {
			LIBUSBMUXD_DEBUG(1, "%s: Error receiving payload of size %d (bytes received: %d)\n", __func__, payload_size, rsize);
			free(payload_loc);
			return -EBADMSG;
		}
	}

	if (hdr.message == MESSAGE_PLIST) {
		char *message = NULL;
		plist_t plist = NULL;
		plist_from_xml(payload_loc, payload_size, &plist);
		free(payload_loc);

		if (!plist) {
			LIBUSBMUXD_DEBUG(1, "%s: Error getting plist from payload!\n", __func__);
			return -EBADMSG;
		}

		plist_t node = plist_dict_get_item(plist, "MessageType");
		if (!node || plist_get_node_type(node) != PLIST_STRING) {
			*payload = plist;
			hdr.length = sizeof(hdr);
			memcpy(header, &hdr, sizeof(hdr));
			return hdr.length;
		}

		plist_get_string_val(node, &message);
		if (message) {
			uint64_t val = 0;
			if (strcmp(message, "Result") == 0) {
				/* result message */
				uint32_t dwval = 0;
				plist_t n = plist_dict_get_item(plist, "Number");
				plist_get_uint_val(n, &val);
				*payload = malloc(sizeof(uint32_t));
				dwval = val;
				memcpy(*payload, &dwval, sizeof(dwval));
				hdr.length = sizeof(hdr) + sizeof(dwval);
				hdr.message = MESSAGE_RESULT;
			} else if (strcmp(message, "Attached") == 0) {
				/* device add message */
				usbmuxd_device_info_t *devinfo = NULL;
				plist_t props = plist_dict_get_item(plist, "Properties");
				if (!props) {
					LIBUSBMUXD_DEBUG(1, "%s: Could not get properties for message '%s' from plist!\n", __func__, message);
					free(message);
					plist_free(plist);
					return -EBADMSG;
				}

				devinfo = device_info_from_plist(props);
				if (!devinfo) {
					LIBUSBMUXD_DEBUG(1, "%s: Could not create device info object from properties!\n", __func__);
					free(message);
					plist_free(plist);
					return -EBADMSG;
				}
				*payload = (void*)devinfo;
				hdr.length = sizeof(hdr) + sizeof(usbmuxd_device_info_t);
				hdr.message = MESSAGE_DEVICE_ADD;
			} else if (strcmp(message, "Detached") == 0) {
				/* device remove message */
				uint32_t dwval = 0;
				plist_t n = plist_dict_get_item(plist, "DeviceID");
				if (n) {
					plist_get_uint_val(n, &val);
					*payload = malloc(sizeof(uint32_t));
					dwval = val;
					memcpy(*payload, &dwval, sizeof(dwval));
					hdr.length = sizeof(hdr) + sizeof(dwval);
					hdr.message = MESSAGE_DEVICE_REMOVE;
				}
			} else if (strcmp(message, "Paired") == 0) {
				/* device pair message */
				uint32_t dwval = 0;
				plist_t n = plist_dict_get_item(plist, "DeviceID");
				if (n) {
					plist_get_uint_val(n, &val);
					*payload = malloc(sizeof(uint32_t));
					dwval = val;
					memcpy(*payload, &dwval, sizeof(dwval));
					hdr.length = sizeof(hdr) + sizeof(dwval);
					hdr.message = MESSAGE_DEVICE_PAIRED;
				}
			} else {
				char *xml = NULL;
				uint32_t len = 0;
				plist_to_xml(plist, &xml, &len);
				LIBUSBMUXD_DEBUG(1, "%s: Unexpected message '%s' in plist:\n%s\n", __func__, message, xml);
				free(xml);
				free(message);
				plist_free(plist);
				return -EBADMSG;
			}
			free(message);
		}
		plist_free(plist);
	} else if (hdr.message == MESSAGE_DEVICE_ADD) {
		usbmuxd_device_info_t *devinfo = device_info_from_device_record((struct usbmuxd_device_record*)payload_loc);
		free(payload_loc);
		*payload = devinfo;
	} else {
		*payload = payload_loc;
	}

	memcpy(header, &hdr, sizeof(hdr));

	return hdr.length;
}

/**
 * Retrieves the result code to a previously sent request.
 */
static int usbmuxd_get_result(int sfd, uint32_t tag, uint32_t *result, void **result_plist)
{
	struct usbmuxd_header hdr;
	int recv_len;
	uint32_t *res = NULL;

	if (!result) {
		return -EINVAL;
	}
	*result = -1;
	if (result_plist) {
		*result_plist = NULL;
	}

	recv_len = receive_packet(sfd, &hdr, (void**)&res, 5000);
	if (recv_len < 0 || (size_t)recv_len < sizeof(hdr)) {
		free(res);
		return (recv_len < 0 ? recv_len : -EPROTO);
	}

	if (hdr.message == MESSAGE_RESULT) {
		int ret = 0;
		if (hdr.tag != tag) {
			LIBUSBMUXD_DEBUG(1, "%s: WARNING: tag mismatch (%d != %d). Proceeding anyway.\n", __func__, hdr.tag, tag);
		}
		if (res) {
			memcpy(result, res, sizeof(uint32_t));
			ret = 1;
		}
		free(res);
		return ret;
	}

	if (hdr.message == MESSAGE_PLIST) {
		if (!result_plist) {
			LIBUSBMUXD_DEBUG(1, "%s: MESSAGE_PLIST result but result_plist pointer is NULL!\n", __func__);
			return -1;
		}
		*result_plist = (plist_t)res;
		*result = RESULT_OK;
		return 1;
	}

	LIBUSBMUXD_DEBUG(1, "%s: Unexpected message of type %d received!\n", __func__, hdr.message);
	free(res);
	return -EPROTO;
}

static int send_packet(int sfd, uint32_t message, uint32_t tag, void *payload, uint32_t payload_size)
{
	struct usbmuxd_header header;

	header.length = sizeof(struct usbmuxd_header);
	header.version = proto_version;
	header.message = message;
	header.tag = tag;
	if (payload && (payload_size > 0)) {
		header.length += payload_size;
	}
	int sent = socket_send(sfd, &header, sizeof(header));
	if (sent != sizeof(header)) {
		LIBUSBMUXD_DEBUG(1, "%s: ERROR: could not send packet header\n", __func__);
		return -1;
	}
	if (payload && (payload_size > 0)) {
		uint32_t ssize = 0;
		do {
			int res = socket_send(sfd, (char*)payload + ssize, payload_size - ssize);
			if (res < 0) {
				break;
			}
			ssize += res;
		} while (ssize < payload_size);
		sent += ssize;
	}
	if (sent != (int)header.length) {
		LIBUSBMUXD_DEBUG(1, "%s: ERROR: could not send whole packet (sent %d of %d)\n", __func__, sent, header.length);
		socket_close(sfd);
		return -1;
	}
	return sent;
}

static int send_plist_packet(int sfd, uint32_t tag, plist_t message)
{
	int res;
	char *payload = NULL;
	uint32_t payload_size = 0;

	plist_to_xml(message, &payload, &payload_size);
	res = send_packet(sfd, MESSAGE_PLIST, tag, payload, payload_size);
	free(payload);

	return res;
}

static void get_bundle_id()
{
#if defined (__APPLE__)
	char CONTENTS_INFO_PLIST[] = "Contents/Info.plist";
	char* execpath = malloc(1024);
	uint32_t size = 1024;
	if (_NSGetExecutablePath(execpath, &size) != 0) {
		free(execpath);
		return;
	}
	// strip off executable name
	char *p = execpath + strlen(execpath) - 1;
	while (p > execpath && *p != '/') p--;
	if (*p == '/') *p = '\0';
	// now walk back trying to find "/Contents/MacOS", and strip it off
	int macos_found = 0;
	while (p > execpath) {
		p--;
		if (*p != '/') continue;
		if (strcmp(p, "/.") == 0) {
			*p = '\0';
		} else if (!macos_found && strcmp(p, "/MacOS") == 0) {
			*p = '\0';
			macos_found++;
		} else if (macos_found && strcmp(p, "/Contents") == 0) {
			*p = '\0';
			break;
		} else {
			break;
		}
	}
	// now just append "/Contents/Info.plist"
	size_t len = strlen(execpath) + sizeof(CONTENTS_INFO_PLIST) + 1;
	char *infopl = malloc(len);
	snprintf(infopl, len, "%s/%s", execpath, CONTENTS_INFO_PLIST);
	free(execpath);
	struct stat fst;
	fst.st_size = 0;
	if (stat(infopl, &fst) != 0) {
		free(infopl);
		return;
	}
	size_t fsize = fst.st_size;
	if (fsize < 8) {
		free(infopl);
		return;
	}
	FILE *f = fopen(infopl, "r");
	free(infopl);
	if (!f)
		return;
	char *buf = malloc(fsize);
	if (!buf)
		return;
	if (fread(buf, 1, fsize, f) == fsize) {
		plist_t pl = NULL;
		if (memcmp(buf, "bplist00", 8) == 0) {
			plist_from_bin(buf, fst.st_size, &pl);
		} else {
			plist_from_xml(buf, fst.st_size, &pl);
		}
		if (pl) {
			plist_t bid = plist_dict_get_item(pl, "CFBundleIdentifier");
			if (plist_get_node_type(bid) == PLIST_STRING) {
				plist_get_string_val(bid, &bundle_id);
			}
			plist_free(pl);
		}
	}
	free(buf);
	fclose(f);
#endif
}

static void get_prog_name()
{
#if defined(__APPLE__) || defined(__FreeBSD__)
	const char *pname = getprogname();
	if (pname) {
		prog_name = strdup(pname);
	}
#elif defined (WIN32)
	TCHAR *_pname = malloc((MAX_PATH+1) * sizeof(TCHAR));
	if (GetModuleFileName(NULL, _pname, MAX_PATH+1) > 0) {
		char* pname = NULL;
	#if defined(UNICODE) || defined(_UNICODE)
		char* __pname = NULL;
		int l = WideCharToMultiByte(CP_UTF8, 0, _pname, -1, NULL, 0, NULL, NULL);
		if (l > 0) {
			__pname = malloc(l);
			if (WideCharToMultiByte(CP_UTF8, 0, _pname, -1, __pname, l, NULL, NULL) > 0) {
				pname = __pname;
			}
		}
	#else
		pname = _pname;
	#endif
		if (pname) {
			char *p = pname+strlen(pname)-1;
			while (p > pname && *p != '\\' && *p != '/') p--;
			if (*p == '\\' || *p == '/') p++;
			prog_name = strdup(p);
		}
	#if defined(UNICODE) || defined(_UNICODE)
		free(__pname);
	#endif
	}
	free(_pname);
#elif defined (HAVE_PROGRAM_INVOCATION_SHORT_NAME)
	char *pname = program_invocation_short_name;
	if (pname) {
		prog_name = strdup(pname);
	}
#elif defined (__linux__)
	FILE *f = fopen("/proc/self/stat", "r");
	if (!f) {
		return;
	}
	char *tmpbuf = malloc(512);
	size_t r = fread(tmpbuf, 1, 512, f);
	if (r > 0) {
		char *p = tmpbuf;
		while ((p-tmpbuf < r) && (*p != '(') && (*p != '\0')) p++;
		if (*p == '(') {
			p++;
			char *pname = p;
			while ((p-tmpbuf < r) && (*p != ')') && (*p != '\0')) p++;
			if (*p == ')') {
				*p = '\0';
				prog_name = strdup(pname);
			}
		}
	}
	free(tmpbuf);
	fclose(f);
#else
	#warning FIXME: no method to determine program name
#endif
}

static plist_t create_plist_message(const char* message_type)
{
	if (!bundle_id) {
		get_bundle_id();
	}
	if (!prog_name) {
		get_prog_name();
	}
	plist_t plist = plist_new_dict();
	if (bundle_id) {
		plist_dict_set_item(plist, "BundleID", plist_new_string(bundle_id));
	}
	plist_dict_set_item(plist, "ClientVersionString", plist_new_string(PLIST_CLIENT_VERSION_STRING));
	plist_dict_set_item(plist, "MessageType", plist_new_string(message_type));
	if (prog_name) {
		plist_dict_set_item(plist, "ProgName", plist_new_string(prog_name));
	}
	plist_dict_set_item(plist, "kLibUSBMuxVersion", plist_new_uint(PLIST_LIBUSBMUX_VERSION));
	return plist;
}

static int send_listen_packet(int sfd, uint32_t tag)
{
	int res = 0;
	if (proto_version == 1) {
		/* construct message plist */
		plist_t plist = create_plist_message("Listen");

		res = send_plist_packet(sfd, tag, plist);
		plist_free(plist);
	} else {
		/* binary packet */
		res = send_packet(sfd, MESSAGE_LISTEN, tag, NULL, 0);
	}
	return res;
}

static int send_connect_packet(int sfd, uint32_t tag, uint32_t device_id, uint16_t port)
{
	int res = 0;
	if (proto_version == 1) {
		/* construct message plist */
		plist_t plist = create_plist_message("Connect");
		plist_dict_set_item(plist, "DeviceID", plist_new_uint(device_id));
		plist_dict_set_item(plist, "PortNumber", plist_new_uint(htons(port)));

		res = send_plist_packet(sfd, tag, plist);
		plist_free(plist);
	} else {
		/* binary packet */
		struct {
			uint32_t device_id;
			uint16_t port;
			uint16_t reserved;
		} conninfo;

		conninfo.device_id = device_id;
		conninfo.port = htons(port);
		conninfo.reserved = 0;

		res = send_packet(sfd, MESSAGE_CONNECT, tag, &conninfo, sizeof(conninfo));
	}
	return res;
}

static int send_list_devices_packet(int sfd, uint32_t tag)
{
	int res = -1;

	/* construct message plist */
	plist_t plist = create_plist_message("ListDevices");

	res = send_plist_packet(sfd, tag, plist);
	plist_free(plist);

	return res;
}

static int send_read_buid_packet(int sfd, uint32_t tag)
{
	int res = -1;

	/* construct message plist */
	plist_t plist = create_plist_message("ReadBUID");

	res = send_plist_packet(sfd, tag, plist);
	plist_free(plist);

	return res;
}

static int send_pair_record_packet(int sfd, uint32_t tag, const char* msgtype, const char* pair_record_id, uint32_t device_id, plist_t data)
{
	int res = -1;

	/* construct message plist */
	plist_t plist = create_plist_message(msgtype);
	plist_dict_set_item(plist, "PairRecordID", plist_new_string(pair_record_id));
	if (data) {
		plist_dict_set_item(plist, "PairRecordData", plist_copy(data));
	}
	if (device_id > 0) {
		plist_dict_set_item(plist, "DeviceID", plist_new_uint(device_id));
	}

	res = send_plist_packet(sfd, tag, plist);
	plist_free(plist);

	return res;
}

/**
 * Generates an event, i.e. calls the callback function.
 * A reference to a populated usbmuxd_event_t with information about the event
 * and the corresponding device will be passed to the callback function.
 */
static void generate_event(const usbmuxd_device_info_t *dev, enum usbmuxd_event_type event)
{
	usbmuxd_event_t ev;

	if (!dev) {
		return;
	}

	ev.event = event;
	memcpy(&ev.device, dev, sizeof(usbmuxd_device_info_t));

	mutex_lock(&listener_mutex);
	FOREACH(struct usbmuxd_subscription_context* context, &listeners) {
		context->callback(&ev, context->user_data);
	} ENDFOREACH
	mutex_unlock(&listener_mutex);
}

static int usbmuxd_listen_poll()
{
	int sfd;

	sfd = connect_usbmuxd_socket();
	if (sfd < 0) {
		while (1) {
			mutex_lock(&listener_mutex);
			int num = collection_count(&listeners);
			mutex_unlock(&listener_mutex);
			if (num <= 0) {
				break;
			}
			if ((sfd = connect_usbmuxd_socket()) >= 0) {
				break;
			}
			sleep(1);
		}
	}

	return sfd;
}

#ifdef HAVE_INOTIFY
#ifndef HAVE_PSELECT
static int pselect(int nfds, fd_set *readfds, fd_set *writefds, fd_set *exceptfds, const struct timespec *timeout, const sigset_t *sigmask)
{
	int ready;
	struct timeval tv;
	struct timeval *p_timeout;
	sigset_t origmask;

	if (timeout) {
		tv.tv_sec = timeout->tv_sec;
		tv.tv_usec = timeout->tv_nsec / 1000;
		p_timeout = &tv;
	} else {
		p_timeout = NULL;
	}

	pthread_sigmask(SIG_SETMASK, sigmask, &origmask);
	ready = select(nfds, readfds, writefds, exceptfds, p_timeout);
	pthread_sigmask(SIG_SETMASK, &origmask, NULL);

	return ready;
}
#endif

static int usbmuxd_listen_inotify()
{
	int inot_fd;
	int watch_d;
	int sfd;

	if (!use_inotify) {
		return -2;
	}

	sfd = connect_usbmuxd_socket();
	if (sfd >= 0)
		return sfd;

	sfd = -1;
	inot_fd = inotify_init ();
	if (inot_fd < 0) {
		LIBUSBMUXD_DEBUG(1, "%s: Failed to setup inotify\n", __func__);
		return -2;
	}

	/* inotify is setup, listen for events that concern us */
	watch_d = inotify_add_watch (inot_fd, USBMUXD_DIRNAME, IN_CREATE);
	if (watch_d < 0) {
		LIBUSBMUXD_DEBUG(1, "%s: Failed to setup watch descriptor for socket dir\n", __func__);
		close (inot_fd);
		return -2;
	}

	while (1) {
		fd_set rfds;
		struct timespec tv = {1, 0};

		FD_ZERO(&rfds);
		FD_SET(inot_fd, &rfds);
		int r = pselect(inot_fd+1, &rfds, NULL, NULL, &tv, NULL);
		if (r < 0) {
			break;
		}

		if (r == 0) {
			continue;
		}

		ssize_t len, i;
		char buff[EVENT_BUF_LEN] = {0};

		i = 0;
		len = read (inot_fd, buff, EVENT_BUF_LEN -1);
		if (len < 0)
			goto end;
		while (i < len) {
			struct inotify_event *pevent = (struct inotify_event *) & buff[i];

			/* check that it's ours */
			if (pevent->mask & IN_CREATE &&
				pevent->len &&
				pevent->name[0] != 0 &&
				strcmp(pevent->name, USBMUXD_SOCKET_NAME) == 0) {
				/* retry if usbmuxd isn't ready yet */
				int retry = 10;
				while (--retry >= 0) {
					if ((sfd = connect_usbmuxd_socket ()) >= 0) {
						break;
					}
					sleep(1);
				}
				goto end;
			}
			i += EVENT_SIZE + pevent->len;
		}
	}

end:
	inotify_rm_watch(inot_fd, watch_d);
	close(inot_fd);

	return sfd;
}
#endif /* HAVE_INOTIFY */

/**
 * Tries to connect to usbmuxd and wait if it is not running.
 */
static int usbmuxd_listen()
{
	int sfd;
	uint32_t res = -1;
	int tag;

retry:

#ifdef HAVE_INOTIFY
	sfd = usbmuxd_listen_inotify();
	if (sfd == -2)
		sfd = usbmuxd_listen_poll();
#else
	sfd = usbmuxd_listen_poll();
#endif

	if (sfd < 0) {
		if (!cancelling) {
			LIBUSBMUXD_DEBUG(1, "%s: ERROR: usbmuxd was supposed to be running here...\n", __func__);
		}
		return sfd;
	}

	tag = ++use_tag;
	if (send_listen_packet(sfd, tag) <= 0) {
		LIBUSBMUXD_DEBUG(1, "%s: ERROR: could not send listen packet\n", __func__);
		socket_close(sfd);
		return -1;
	}
	if ((usbmuxd_get_result(sfd, tag, &res, NULL) == 1) && (res != 0)) {
		socket_close(sfd);
		if ((res == RESULT_BADVERSION) && (proto_version == 1)) {
			proto_version = 0;
			goto retry;
		}
		LIBUSBMUXD_DEBUG(1, "%s: ERROR: did not get OK but %d\n", __func__, res);
		return -1;
	}
	return sfd;
}

/**
 * Waits for an event to occur, i.e. a packet coming from usbmuxd.
 * Calls generate_event to pass the event via callback to the client program.
 */
static int get_next_event(int sfd)
{
	struct usbmuxd_header hdr;
	void *payload = NULL;

	/* block until we receive something */
	if (receive_packet(sfd, &hdr, &payload, 0) < 0) {
		if (!cancelling) {
			LIBUSBMUXD_DEBUG(1, "%s: Error in usbmuxd connection, disconnecting all devices!\n", __func__);
		}
		// when then usbmuxd connection fails,
		// generate remove events for every device that
		// is still present so applications know about it
		FOREACH(usbmuxd_device_info_t *dev, &devices) {
			generate_event(dev, UE_DEVICE_REMOVE);
			collection_remove(&devices, dev);
			free(dev);
		} ENDFOREACH
		return -EIO;
	}

	if ((hdr.length > sizeof(hdr)) && !payload) {
		LIBUSBMUXD_DEBUG(1, "%s: Invalid packet received, payload is missing!\n", __func__);
		return -EBADMSG;
	}

	if (hdr.message == MESSAGE_DEVICE_ADD) {
		usbmuxd_device_info_t *devinfo = (usbmuxd_device_info_t*)payload;
		collection_add(&devices, devinfo);
		generate_event(devinfo, UE_DEVICE_ADD);
		payload = NULL;
	} else if (hdr.message == MESSAGE_DEVICE_REMOVE) {
		uint32_t handle;
		usbmuxd_device_info_t *devinfo;

		memcpy(&handle, payload, sizeof(uint32_t));

		devinfo = devices_find(handle);
		if (!devinfo) {
			LIBUSBMUXD_DEBUG(1, "%s: WARNING: got device remove message for handle %d, but couldn't find the corresponding handle in the device list. This event will be ignored.\n", __func__, handle);
		} else {
			generate_event(devinfo, UE_DEVICE_REMOVE);
			collection_remove(&devices, devinfo);
			free(devinfo);
		}
	} else if (hdr.message == MESSAGE_DEVICE_PAIRED) {
		uint32_t handle;
		usbmuxd_device_info_t *devinfo;

		memcpy(&handle, payload, sizeof(uint32_t));

		devinfo = devices_find(handle);
		if (!devinfo) {
			LIBUSBMUXD_DEBUG(1, "%s: WARNING: got paired message for device handle %d, but couldn't find the corresponding handle in the device list. This event will be ignored.\n", __func__, handle);
		} else {
			generate_event(devinfo, UE_DEVICE_PAIRED);
		}
	} else if (hdr.length > 0) {
		LIBUSBMUXD_DEBUG(1, "%s: Unexpected message type %d length %d received!\n", __func__, hdr.message, hdr.length);
	}
	free(payload);
	return 0;
}

static void device_monitor_cleanup(void* data)
{
	FOREACH(usbmuxd_device_info_t *dev, &devices) {
		collection_remove(&devices, dev);
		free(dev);
	} ENDFOREACH
	collection_free(&devices);

	socket_close(listenfd);
	listenfd = -1;
}

/**
 * Device Monitor thread function.
 *
 * This function sets up a connection to usbmuxd
 */
static void *device_monitor(void *data)
{
	running = 1;
	collection_init(&devices);
	cancelling = 0;

#ifdef HAVE_THREAD_CLEANUP
	thread_cleanup_push(device_monitor_cleanup, NULL);
#endif
	do {

		listenfd = usbmuxd_listen();
		if (listenfd < 0) {
			continue;
		}

		while (running) {
			int res = get_next_event(listenfd);
			if (res < 0) {
				break;
			}
		}

		mutex_lock(&listener_mutex);
		if (collection_count(&listeners) == 0) {
			running = 0;
		}
		mutex_unlock(&listener_mutex);
	} while (running);

#ifdef HAVE_THREAD_CLEANUP
	thread_cleanup_pop(1);
#else
	device_monitor_cleanup(NULL);
#endif

	return NULL;
}

static void init_listeners(void)
{
	collection_init(&listeners);
	mutex_init(&listener_mutex);
}

USBMUXD_API int usbmuxd_events_subscribe(usbmuxd_subscription_context_t *context, usbmuxd_event_cb_t callback, void *user_data)
{
	if (!context || !callback) {
		return -EINVAL;
	}

	thread_once(&listener_init_once, init_listeners);

	mutex_lock(&listener_mutex);
	*context = malloc(sizeof(struct usbmuxd_subscription_context));
	if (!*context) {
		mutex_unlock(&listener_mutex);
		LIBUSBMUXD_ERROR("ERROR: %s: malloc failed\n", __func__);
		return -ENOMEM;
	}
	(*context)->callback = callback;
	(*context)->user_data = user_data;

	collection_add(&listeners, *context);

	if (devmon == THREAD_T_NULL || !thread_alive(devmon)) {
		mutex_unlock(&listener_mutex);
		int res = thread_new(&devmon, device_monitor, NULL);
		if (res != 0) {
			free(*context);
			LIBUSBMUXD_DEBUG(1, "%s: ERROR: Could not start device watcher thread!\n", __func__);
			return res;
		}
	} else {
		/* we need to submit DEVICE_ADD events to the new listener */
		FOREACH(usbmuxd_device_info_t *dev, &devices) {
			if (dev) {
				usbmuxd_event_t ev;
				ev.event = UE_DEVICE_ADD;
				memcpy(&ev.device, dev, sizeof(usbmuxd_device_info_t));
				(*context)->callback(&ev, (*context)->user_data);
			}
		} ENDFOREACH
		mutex_unlock(&listener_mutex);
	}

	return 0;
}

USBMUXD_API int usbmuxd_events_unsubscribe(usbmuxd_subscription_context_t context)
{
	int ret = 0;
	int num = 0;

	if (!context) {
		return -EINVAL;
	}

	mutex_lock(&listener_mutex);
	if (collection_remove(&listeners, context) == 0) {
		FOREACH(usbmuxd_device_info_t *dev, &devices) {
			if (dev) {
				usbmuxd_event_t ev;
				ev.event = UE_DEVICE_REMOVE;
				memcpy(&ev.device, dev, sizeof(usbmuxd_device_info_t));
				(context)->callback(&ev, (context)->user_data);
			}
		} ENDFOREACH
		free(context);
	}
	num = collection_count(&listeners);
	mutex_unlock(&listener_mutex);

	if (num == 0) {
		int res = 0;
		cancelling = 1;
		socket_shutdown(listenfd, SHUT_RDWR);
		if (thread_alive(devmon)) {
			if (thread_cancel(devmon) < 0) {
				running = 0;
			}
#if defined(HAVE_INOTIFY) && !defined(HAVE_PTHREAD_CANCEL)
			pthread_kill(devmon, SIGINT);
#endif
			res = thread_join(devmon);
			thread_free(devmon);
			devmon = THREAD_T_NULL;
		}
		if ((res != 0) && (res != ESRCH)) {
			ret = res;
		}
	}

	return ret;
}

USBMUXD_API int usbmuxd_subscribe(usbmuxd_event_cb_t callback, void *user_data)
{
	if (!callback) {
		return -EINVAL;
	}

	if (event_ctx) {
		usbmuxd_events_unsubscribe(event_ctx);
		event_ctx = NULL;
	}
	return usbmuxd_events_subscribe(&event_ctx, callback, user_data);
}

USBMUXD_API int usbmuxd_unsubscribe(void)
{
	int res = usbmuxd_events_unsubscribe(event_ctx);
	event_ctx = NULL;
	return res;
}

USBMUXD_API int usbmuxd_get_device_list(usbmuxd_device_info_t **device_list)
{
	int sfd;
	int tag;
	int listen_success = 0;
	uint32_t res;
	struct collection tmpdevs;
	usbmuxd_device_info_t *newlist = NULL;
	struct usbmuxd_header hdr;
	int dev_cnt = 0;
	void *payload = NULL;

	*device_list = NULL;

retry:
	sfd = connect_usbmuxd_socket();
	if (sfd < 0) {
		LIBUSBMUXD_DEBUG(1, "%s: error opening socket!\n", __func__);
		return sfd;
	}

	tag = ++use_tag;
	if ((proto_version == 1) && (try_list_devices)) {
		if (send_list_devices_packet(sfd, tag) > 0) {
			plist_t list = NULL;
			if ((usbmuxd_get_result(sfd, tag, &res, &list) == 1) && (res == 0)) {
				plist_t devlist = plist_dict_get_item(list, "DeviceList");
				if (devlist && plist_get_node_type(devlist) == PLIST_ARRAY) {
					collection_init(&tmpdevs);
					uint32_t numdevs = plist_array_get_size(devlist);
					uint32_t i;
					for (i = 0; i < numdevs; i++) {
						plist_t pdev = plist_array_get_item(devlist, i);
						plist_t props = plist_dict_get_item(pdev, "Properties");
						usbmuxd_device_info_t *devinfo = device_info_from_plist(props);
						if (!devinfo) {
							socket_close(sfd);
							LIBUSBMUXD_DEBUG(1, "%s: Could not create device info object from properties!\n", __func__);
							plist_free(list);
							return -1;
						}
						collection_add(&tmpdevs, devinfo);
					}
					plist_free(list);
					goto got_device_list;
				}
			} else {
				if (res == RESULT_BADVERSION) {
					proto_version = 0;
				}
				socket_close(sfd);
				try_list_devices = 0;
				plist_free(list);
				goto retry;
			}
			plist_free(list);
		}
	}

	tag = ++use_tag;
	if (send_listen_packet(sfd, tag) > 0) {
		res = -1;
		// get response
		if ((usbmuxd_get_result(sfd, tag, &res, NULL) == 1) && (res == 0)) {
			listen_success = 1;
		} else {
			socket_close(sfd);
			if ((res == RESULT_BADVERSION) && (proto_version == 1)) {
				proto_version = 0;
				goto retry;
			}
			LIBUSBMUXD_DEBUG(1, "%s: Did not get response to scan request (with result=0)...\n", __func__);
			return res;
		}
	}

	if (!listen_success) {
		socket_close(sfd);
		LIBUSBMUXD_DEBUG(1, "%s: Could not send listen request!\n", __func__);
		return -1;
	}

	collection_init(&tmpdevs);

	// receive device list
	while (1) {
		if (receive_packet(sfd, &hdr, &payload, 100) > 0) {
			if (hdr.message == MESSAGE_DEVICE_ADD) {
				usbmuxd_device_info_t *devinfo = payload;
				collection_add(&tmpdevs, devinfo);
				payload = NULL;
			} else if (hdr.message == MESSAGE_DEVICE_REMOVE) {
				uint32_t handle;
				usbmuxd_device_info_t *devinfo = NULL;

				memcpy(&handle, payload, sizeof(uint32_t));

				FOREACH(usbmuxd_device_info_t *di, &tmpdevs) {
					if (di && di->handle == handle) {
						devinfo = di;
						break;
					}
				} ENDFOREACH
				if (devinfo) {
					collection_remove(&tmpdevs, devinfo);
					free(devinfo);
				}
			} else {
				LIBUSBMUXD_DEBUG(1, "%s: Unexpected message %d\n", __func__, hdr.message);
			}
			free(payload);
		} else {
			// we _should_ have all of them now.
			// or perhaps an error occured.
			break;
		}
	}

got_device_list:

	// explicitly close connection
	socket_close(sfd);

	// create copy of device info entries from collection
	newlist = (usbmuxd_device_info_t*)malloc(sizeof(usbmuxd_device_info_t) * (collection_count(&tmpdevs) + 1));
	dev_cnt = 0;
	FOREACH(usbmuxd_device_info_t *di, &tmpdevs) {
		if (di) {
			memcpy(&newlist[dev_cnt], di, sizeof(usbmuxd_device_info_t));
			free(di);
			dev_cnt++;
		}
	} ENDFOREACH
	collection_free(&tmpdevs);

	memset(&newlist[dev_cnt], 0, sizeof(usbmuxd_device_info_t));
	*device_list = newlist;

	return dev_cnt;
}

USBMUXD_API int usbmuxd_device_list_free(usbmuxd_device_info_t **device_list)
{
	if (device_list) {
		free(*device_list);
	}
	return 0;
}

USBMUXD_API int usbmuxd_get_device_by_udid(const char *udid, usbmuxd_device_info_t *device)
{
	usbmuxd_device_info_t *dev_list = NULL;
	usbmuxd_device_info_t *dev = NULL;
	int result = 0;
	int i;

	if (!device) {
		return -EINVAL;
	}
	if (usbmuxd_get_device_list(&dev_list) < 0) {
		return -ENODEV;
	}

	for (i = 0; dev_list[i].handle > 0; i++) {
	 	if (!udid) {
			if (dev_list[i].conn_type == CONNECTION_TYPE_USB) {
				dev = &dev_list[i];
				break;
			}
		} else if (!strcmp(udid, dev_list[i].udid)) {
			if (dev_list[i].conn_type == CONNECTION_TYPE_USB) {
				dev = &dev_list[i];
				break;
			}
		}
	}

	if (dev) {
		device->handle = dev->handle;
		device->product_id = dev->product_id;
		char *t = stpncpy(device->udid, dev->udid, sizeof(device->udid)-1);
		*t = '\0';
		device->conn_type = dev->conn_type;
		memcpy(device->conn_data, dev->conn_data, sizeof(device->conn_data));
		result = 1;
	}

	usbmuxd_device_list_free(&dev_list);

	return result;
}

USBMUXD_API int usbmuxd_get_device(const char *udid, usbmuxd_device_info_t *device, enum usbmux_lookup_options options)
{
	usbmuxd_device_info_t *dev_list = NULL;
	usbmuxd_device_info_t *dev_network = NULL;
	usbmuxd_device_info_t *dev_usbmuxd = NULL;
	usbmuxd_device_info_t *dev = NULL;
	int result = 0;
	int i;

	if (!device) {
		return -EINVAL;
	}
	if (usbmuxd_get_device_list(&dev_list) < 0) {
		return -ENODEV;
	}

	if (options == 0) {
		options = DEVICE_LOOKUP_USBMUX;
	}

	for (i = 0; dev_list[i].handle > 0; i++) {
		if (!udid) {
			if ((options & DEVICE_LOOKUP_USBMUX) && (dev_list[i].conn_type == CONNECTION_TYPE_USB)) {
				dev_usbmuxd = &dev_list[i];
				break;
			}
			if ((options & DEVICE_LOOKUP_NETWORK) && (dev_list[i].conn_type == CONNECTION_TYPE_NETWORK)) {
				dev_network = &dev_list[i];
				break;
			}
		} else if (!strcmp(udid, dev_list[i].udid)) {
			if ((options & DEVICE_LOOKUP_USBMUX) && (dev_list[i].conn_type == CONNECTION_TYPE_USB)) {
				dev_usbmuxd = &dev_list[i];
			} else if ((options & DEVICE_LOOKUP_NETWORK) && (dev_list[i].conn_type == CONNECTION_TYPE_NETWORK)) {
				dev_network = &dev_list[i];
			}
		}
		if (dev_usbmuxd && dev_network) {
			break;
		}
	}

	if (dev_network && dev_usbmuxd) {
		dev = (options & DEVICE_LOOKUP_PREFER_NETWORK) ? dev_network : dev_usbmuxd;
	} else if (dev_network) {
		dev = dev_network;
	} else if (dev_usbmuxd) {
		dev = dev_usbmuxd;
	}

	if (dev) {
		device->handle = dev->handle;
		device->product_id = dev->product_id;
		char *t = stpncpy(device->udid, dev->udid, sizeof(device->udid)-1);
		*t = '\0';
		device->conn_type = dev->conn_type;
		memcpy(device->conn_data, dev->conn_data, sizeof(device->conn_data));
		result = 1;
	}

	free(dev_list);

	return result;
}

USBMUXD_API int usbmuxd_connect(const uint32_t handle, const unsigned short port)
{
	int sfd;
	int tag;
	int connected = 0;
	int result = EBADF;

retry:
	sfd = connect_usbmuxd_socket();
	if (sfd < 0) {
		result = errno;
		LIBUSBMUXD_DEBUG(1, "%s: Error: Connection to usbmuxd failed: %s\n", __func__, strerror(result));
		return -result;
	}

	tag = ++use_tag;
	if (send_connect_packet(sfd, tag, (uint32_t)handle, (uint16_t)port) <= 0) {
		LIBUSBMUXD_DEBUG(1, "%s: Error sending connect message!\n", __func__);
	} else {
		// read ACK
		uint32_t res = -1;
		LIBUSBMUXD_DEBUG(2, "%s: Reading connect result...\n", __func__);
		if (usbmuxd_get_result(sfd, tag, &res, NULL) == 1) {
			if (res == 0) {
				LIBUSBMUXD_DEBUG(2, "%s: Connect success!\n", __func__);
				connected = 1;
			} else {
				if ((res == RESULT_BADVERSION) && (proto_version == 1)) {
					proto_version = 0;
					socket_close(sfd);
					goto retry;
				}
				LIBUSBMUXD_DEBUG(1, "%s: Connect failed, Error code=%d\n", __func__, res);
				if (res == RESULT_CONNREFUSED) {
					result = ECONNREFUSED;
				} else if (res == RESULT_BADDEV) {
					result = ENODEV;
				} else {
					result = EBADF;
				}
			}
		}
	}

	if (connected) {
		return sfd;
	}

	socket_close(sfd);

	return -result;
}

USBMUXD_API int usbmuxd_disconnect(int sfd)
{
	return socket_close(sfd);
}

USBMUXD_API int usbmuxd_send(int sfd, const char *data, uint32_t len, uint32_t *sent_bytes)
{
	int num_sent;

	if (sfd < 0) {
		return -EINVAL;
	}

	num_sent = socket_send(sfd, (void*)data, len);
	if (num_sent < 0) {
		*sent_bytes = 0;
		num_sent = errno;
		LIBUSBMUXD_DEBUG(1, "%s: Error %d when sending: %s\n", __func__, num_sent, strerror(num_sent));
		return -num_sent;
	}

	if ((uint32_t)num_sent < len) {
		LIBUSBMUXD_DEBUG(1, "%s: Warning: Did not send enough (only %d of %d)\n", __func__, num_sent, len);
	}

	*sent_bytes = num_sent;

	return 0;
}

USBMUXD_API int usbmuxd_recv_timeout(int sfd, char *data, uint32_t len, uint32_t *recv_bytes, unsigned int timeout)
{
	int num_recv = socket_receive_timeout(sfd, (void*)data, len, 0, timeout);
	if (num_recv < 0) {
		*recv_bytes = 0;
		return num_recv;
	}

	*recv_bytes = num_recv;

	return 0;
}

USBMUXD_API int usbmuxd_recv(int sfd, char *data, uint32_t len, uint32_t *recv_bytes)
{
	return usbmuxd_recv_timeout(sfd, data, len, recv_bytes, 5000);
}

USBMUXD_API int usbmuxd_read_buid(char **buid)
{
	int sfd;
	int tag;
	int ret = -1;

	if (!buid) {
		return -EINVAL;
	}
	*buid = NULL;

	sfd = connect_usbmuxd_socket();
	if (sfd < 0) {
		LIBUSBMUXD_DEBUG(1, "%s: Error: Connection to usbmuxd failed: %s\n", __func__, strerror(errno));
		return sfd;
	}

	proto_version = 1;
	tag = ++use_tag;
	if (send_read_buid_packet(sfd, tag) <= 0) {
		LIBUSBMUXD_DEBUG(1, "%s: Error sending ReadBUID message!\n", __func__);
	} else {
		uint32_t rc = 0;
		plist_t pl = NULL;
		ret = usbmuxd_get_result(sfd, tag, &rc, &pl);
		if ((ret == 1) && (rc == 0)) {
			plist_t node = plist_dict_get_item(pl, "BUID");
			if (node && plist_get_node_type(node) == PLIST_STRING) {
				plist_get_string_val(node, buid);
			}
			ret = 0;
		} else if (ret == 1) {
			ret = -(int)rc;
		}
		plist_free(pl);
	}
	socket_close(sfd);

	return ret;
}

USBMUXD_API int usbmuxd_read_pair_record(const char* record_id, char **record_data, uint32_t *record_size)
{
	int sfd;
	int tag;
	int ret = -1;

	if (!record_id || !record_data || !record_size) {
		return -EINVAL;
	}
	*record_data = NULL;
	*record_size = 0;

	sfd = connect_usbmuxd_socket();
	if (sfd < 0) {
		LIBUSBMUXD_DEBUG(1, "%s: Error: Connection to usbmuxd failed: %s\n",
				__func__, strerror(errno));
		return sfd;
	}

	proto_version = 1;
	tag = ++use_tag;

	if (send_pair_record_packet(sfd, tag, "ReadPairRecord", record_id, 0, NULL) <= 0) {
		LIBUSBMUXD_DEBUG(1, "%s: Error sending ReadPairRecord message!\n", __func__);
	} else {
		uint32_t rc = 0;
		plist_t pl = NULL;
		ret = usbmuxd_get_result(sfd, tag, &rc, &pl);
		if ((ret == 1) && (rc == 0)) {
			plist_t node = plist_dict_get_item(pl, "PairRecordData");
			if (node && plist_get_node_type(node) == PLIST_DATA) {
				uint64_t int64val = 0;
				plist_get_data_val(node, record_data, &int64val);
				if (*record_data && int64val > 0) {
					*record_size = (uint32_t)int64val;
					ret = 0;
				}
			}
		} else if (ret == 1) {
			ret = -(int)rc;
		}
		plist_free(pl);
	}
	socket_close(sfd);

	return ret;
}

USBMUXD_API int usbmuxd_save_pair_record_with_device_id(const char* record_id, uint32_t device_id, const char *record_data, uint32_t record_size)
{
	int sfd;
	int tag;
	int ret = -1;

	if (!record_id || !record_data || !record_size) {
		return -EINVAL;
	}

	sfd = connect_usbmuxd_socket();
	if (sfd < 0) {
		LIBUSBMUXD_DEBUG(1, "%s: Error: Connection to usbmuxd failed: %s\n",
				__func__, strerror(errno));
		return sfd;
	}

	proto_version = 1;
	tag = ++use_tag;

	plist_t data = plist_new_data(record_data, record_size);
	if (send_pair_record_packet(sfd, tag, "SavePairRecord", record_id, device_id, data) <= 0) {
		LIBUSBMUXD_DEBUG(1, "%s: Error sending SavePairRecord message!\n", __func__);
	} else {
		uint32_t rc = 0;
		ret = usbmuxd_get_result(sfd, tag, &rc, NULL);
		if ((ret == 1) && (rc == 0)) {
			ret = 0;
		} else if (ret == 1) {
			ret = -(int)rc;
			LIBUSBMUXD_DEBUG(1, "%s: Error: saving pair record failed: %d\n", __func__, ret);
		}
	}
	plist_free(data);
	socket_close(sfd);

	return ret;
}

USBMUXD_API int usbmuxd_save_pair_record(const char* record_id, const char *record_data, uint32_t record_size)
{
	return usbmuxd_save_pair_record_with_device_id(record_id, 0, record_data, record_size);
}

USBMUXD_API int usbmuxd_delete_pair_record(const char* record_id)
{
	int sfd;
	int tag;
	int ret = -1;

	if (!record_id) {
		return -EINVAL;
	}

	sfd = connect_usbmuxd_socket();
	if (sfd < 0) {
		LIBUSBMUXD_DEBUG(1, "%s: Error: Connection to usbmuxd failed: %s\n",
				__func__, strerror(errno));
		return sfd;
	}

	proto_version = 1;
	tag = ++use_tag;

	if (send_pair_record_packet(sfd, tag, "DeletePairRecord", record_id, 0, NULL) <= 0) {
		LIBUSBMUXD_DEBUG(1, "%s: Error sending DeletePairRecord message!\n", __func__);
	} else {
		uint32_t rc = 0;
		ret = usbmuxd_get_result(sfd, tag, &rc, NULL);
		if ((ret == 1) && (rc == 0)) {
			ret = 0;
		} else if (ret == 1) {
			ret = -(int)rc;
			LIBUSBMUXD_DEBUG(1, "%s: Error: deleting pair record failed: %d\n", __func__, ret);
		}
	}
	socket_close(sfd);

	return ret;
}

USBMUXD_API void libusbmuxd_set_use_inotify(int set)
{
#ifdef HAVE_INOTIFY
	use_inotify = set;
#endif
}

USBMUXD_API void libusbmuxd_set_debug_level(int level)
{
	libusbmuxd_debug = level;
	socket_set_verbose(level);
}