summaryrefslogtreecommitdiff
path: root/source3/lib/util_sock.c
blob: 46bb70952165127a331a7d960e58ef7db3e7a5a7 (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
/* 
   Unix SMB/CIFS implementation.
   Samba utility functions
   Copyright (C) Andrew Tridgell 1992-1998
   Copyright (C) Tim Potter      2000-2001
   Copyright (C) Jeremy Allison  1992-2005
   
   This program is free software; you can redistribute it and/or modify
   it under the terms of the GNU General Public License as published by
   the Free Software Foundation; either version 2 of the License, or
   (at your option) any later version.
   
   This program 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 General Public License for more details.
   
   You should have received a copy of the GNU General Public License
   along with this program; if not, write to the Free Software
   Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
*/

#include "includes.h"

/* the following 3 client_*() functions are nasty ways of allowing
   some generic functions to get info that really should be hidden in
   particular modules */
static int client_fd = -1;
/* What to print out on a client disconnect error. */
static char client_ip_string[16];

void client_setfd(int fd)
{
	client_fd = fd;
	safe_strcpy(client_ip_string, get_peer_addr(client_fd), sizeof(client_ip_string)-1);
}

static char *get_socket_addr(int fd)
{
	struct sockaddr sa;
	struct sockaddr_in *sockin = (struct sockaddr_in *) (&sa);
	socklen_t length = sizeof(sa);
	static fstring addr_buf;

	fstrcpy(addr_buf,"0.0.0.0");

	if (fd == -1) {
		return addr_buf;
	}
	
	if (getsockname(fd, &sa, &length) < 0) {
		DEBUG(0,("getsockname failed. Error was %s\n", strerror(errno) ));
		return addr_buf;
	}
	
	fstrcpy(addr_buf,(char *)inet_ntoa(sockin->sin_addr));
	
	return addr_buf;
}

static int get_socket_port(int fd)
{
	struct sockaddr sa;
	struct sockaddr_in *sockin = (struct sockaddr_in *) (&sa);
	socklen_t length = sizeof(sa);

	if (fd == -1)
		return -1;
	
	if (getsockname(fd, &sa, &length) < 0) {
		DEBUG(0,("getpeername failed. Error was %s\n", strerror(errno) ));
		return -1;
	}
	
	return ntohs(sockin->sin_port);
}

char *client_name(void)
{
	return get_peer_name(client_fd,False);
}

char *client_addr(void)
{
	return get_peer_addr(client_fd);
}

char *client_socket_addr(void)
{
	return get_socket_addr(client_fd);
}

int client_socket_port(void)
{
	return get_socket_port(client_fd);
}

struct in_addr *client_inaddr(struct sockaddr *sa)
{
	struct sockaddr_in *sockin = (struct sockaddr_in *) (sa);
	socklen_t  length = sizeof(*sa);
	
	if (getpeername(client_fd, sa, &length) < 0) {
		DEBUG(0,("getpeername failed. Error was %s\n", strerror(errno) ));
		return NULL;
	}
	
	return &sockin->sin_addr;
}

/* the last IP received from */
struct in_addr lastip;

/* the last port received from */
int lastport=0;

int smb_read_error = 0;

/****************************************************************************
 Determine if a file descriptor is in fact a socket.
****************************************************************************/

BOOL is_a_socket(int fd)
{
	int v;
	socklen_t l;
	l = sizeof(int);
	return(getsockopt(fd, SOL_SOCKET, SO_TYPE, (char *)&v, &l) == 0);
}

enum SOCK_OPT_TYPES {OPT_BOOL,OPT_INT,OPT_ON};

typedef struct smb_socket_option {
	const char *name;
	int level;
	int option;
	int value;
	int opttype;
} smb_socket_option;

static const smb_socket_option socket_options[] = {
  {"SO_KEEPALIVE",      SOL_SOCKET,    SO_KEEPALIVE,    0,                 OPT_BOOL},
  {"SO_REUSEADDR",      SOL_SOCKET,    SO_REUSEADDR,    0,                 OPT_BOOL},
  {"SO_BROADCAST",      SOL_SOCKET,    SO_BROADCAST,    0,                 OPT_BOOL},
#ifdef TCP_NODELAY
  {"TCP_NODELAY",       IPPROTO_TCP,   TCP_NODELAY,     0,                 OPT_BOOL},
#endif
#ifdef TCP_KEEPCNT
  {"TCP_KEEPCNT",       IPPROTO_TCP,   TCP_KEEPCNT,     0,                 OPT_INT},
#endif
#ifdef TCP_KEEPIDLE
  {"TCP_KEEPIDLE",      IPPROTO_TCP,   TCP_KEEPIDLE,    0,                 OPT_INT},
#endif
#ifdef TCP_KEEPINTVL
  {"TCP_KEEPINTVL",     IPPROTO_TCP,   TCP_KEEPINTVL,   0,                 OPT_INT},
#endif
#ifdef IPTOS_LOWDELAY
  {"IPTOS_LOWDELAY",    IPPROTO_IP,    IP_TOS,          IPTOS_LOWDELAY,    OPT_ON},
#endif
#ifdef IPTOS_THROUGHPUT
  {"IPTOS_THROUGHPUT",  IPPROTO_IP,    IP_TOS,          IPTOS_THROUGHPUT,  OPT_ON},
#endif
#ifdef SO_REUSEPORT
  {"SO_REUSEPORT",      SOL_SOCKET,    SO_REUSEPORT,    0,                 OPT_BOOL},
#endif
#ifdef SO_SNDBUF
  {"SO_SNDBUF",         SOL_SOCKET,    SO_SNDBUF,       0,                 OPT_INT},
#endif
#ifdef SO_RCVBUF
  {"SO_RCVBUF",         SOL_SOCKET,    SO_RCVBUF,       0,                 OPT_INT},
#endif
#ifdef SO_SNDLOWAT
  {"SO_SNDLOWAT",       SOL_SOCKET,    SO_SNDLOWAT,     0,                 OPT_INT},
#endif
#ifdef SO_RCVLOWAT
  {"SO_RCVLOWAT",       SOL_SOCKET,    SO_RCVLOWAT,     0,                 OPT_INT},
#endif
#ifdef SO_SNDTIMEO
  {"SO_SNDTIMEO",       SOL_SOCKET,    SO_SNDTIMEO,     0,                 OPT_INT},
#endif
#ifdef SO_RCVTIMEO
  {"SO_RCVTIMEO",       SOL_SOCKET,    SO_RCVTIMEO,     0,                 OPT_INT},
#endif
#ifdef TCP_FASTACK
  {"TCP_FASTACK",       IPPROTO_TCP,   TCP_FASTACK,     0,                 OPT_INT},
#endif
  {NULL,0,0,0,0}};

/****************************************************************************
 Print socket options.
****************************************************************************/

static void print_socket_options(int s)
{
	int value;
	socklen_t vlen = 4;
	const smb_socket_option *p = &socket_options[0];

	/* wrapped in if statement to prevent streams leak in SCO Openserver 5.0 */
	/* reported on samba-technical  --jerry */
	if ( DEBUGLEVEL >= 5 ) {
	for (; p->name != NULL; p++) {
		if (getsockopt(s, p->level, p->option, (void *)&value, &vlen) == -1) {
			DEBUG(5,("Could not test socket option %s.\n", p->name));
		} else {
			DEBUG(5,("socket option %s = %d\n",p->name,value));
			}
		}
	}
 }

/****************************************************************************
 Set user socket options.
****************************************************************************/

void set_socket_options(int fd, const char *options)
{
	fstring tok;

	while (next_token(&options,tok," \t,", sizeof(tok))) {
		int ret=0,i;
		int value = 1;
		char *p;
		BOOL got_value = False;

		if ((p = strchr_m(tok,'='))) {
			*p = 0;
			value = atoi(p+1);
			got_value = True;
		}

		for (i=0;socket_options[i].name;i++)
			if (strequal(socket_options[i].name,tok))
				break;

		if (!socket_options[i].name) {
			DEBUG(0,("Unknown socket option %s\n",tok));
			continue;
		}

		switch (socket_options[i].opttype) {
		case OPT_BOOL:
		case OPT_INT:
			ret = setsockopt(fd,socket_options[i].level,
						socket_options[i].option,(char *)&value,sizeof(int));
			break;

		case OPT_ON:
			if (got_value)
				DEBUG(0,("syntax error - %s does not take a value\n",tok));

			{
				int on = socket_options[i].value;
				ret = setsockopt(fd,socket_options[i].level,
							socket_options[i].option,(char *)&on,sizeof(int));
			}
			break;	  
		}
      
		if (ret != 0)
			DEBUG(0,("Failed to set socket option %s (Error %s)\n",tok, strerror(errno) ));
	}

	print_socket_options(fd);
}

/****************************************************************************
 Read from a socket.
****************************************************************************/

ssize_t read_udp_socket(int fd,char *buf,size_t len)
{
	ssize_t ret;
	struct sockaddr_in sock;
	socklen_t socklen = sizeof(sock);

	memset((char *)&sock,'\0',socklen);
	memset((char *)&lastip,'\0',sizeof(lastip));
	ret = (ssize_t)sys_recvfrom(fd,buf,len,0,(struct sockaddr *)&sock,&socklen);
	if (ret <= 0) {
		/* Don't print a low debug error for a non-blocking socket. */
		if (errno == EAGAIN) {
			DEBUG(10,("read socket returned EAGAIN. ERRNO=%s\n",strerror(errno)));
		} else {
			DEBUG(2,("read socket failed. ERRNO=%s\n",strerror(errno)));
		}
		return(0);
	}

	lastip = sock.sin_addr;
	lastport = ntohs(sock.sin_port);

	DEBUG(10,("read_udp_socket: lastip %s lastport %d read: %lu\n",
			inet_ntoa(lastip), lastport, (unsigned long)ret));

	return(ret);
}

#if 0

Socket routines from HEAD - maybe re-enable in future. JRA.

/****************************************************************************
 Work out if we've timed out.
****************************************************************************/

static BOOL timeout_until(struct timeval *timeout, const struct timeval *endtime)
{
	struct timeval now;
	SMB_BIG_INT t_dif;

	GetTimeOfDay(&now);

	t_dif = usec_time_diff(endtime, &now);
	if (t_dif <= 0) {
		return False;
	}

	timeout->tv_sec = (t_dif / (SMB_BIG_INT)1000000);
	timeout->tv_usec = (t_dif % (SMB_BIG_INT)1000000);
	return True;
}

/****************************************************************************
 Read data from the client, reading exactly N bytes, or until endtime timeout.
 Use with a non-blocking socket if endtime != NULL.
****************************************************************************/

ssize_t read_data_until(int fd,char *buffer,size_t N, const struct timeval *endtime)
{
	ssize_t ret;
	size_t total=0;

	smb_read_error = 0;

	while (total < N) {

		if (endtime != NULL) {
			fd_set r_fds;
			struct timeval timeout;
			int selrtn;

			if (!timeout_until(&timeout, endtime)) {
				DEBUG(10,("read_data_until: read timed out\n"));
				smb_read_error = READ_TIMEOUT;
				return -1;
			}

			FD_ZERO(&r_fds);
			FD_SET(fd, &r_fds);

			/* Select but ignore EINTR. */
			selrtn = sys_select_intr(fd+1, &r_fds, NULL, NULL, &timeout);
			if (selrtn == -1) {
				/* something is wrong. Maybe the socket is dead? */
				DEBUG(0,("read_data_until: select error = %s.\n", strerror(errno) ));
				smb_read_error = READ_ERROR;
				return -1;
			}

			/* Did we timeout ? */
			if (selrtn == 0) {
				DEBUG(10,("read_data_until: select timed out.\n"));
				smb_read_error = READ_TIMEOUT;
				return -1;
			}
		}

		ret = sys_read(fd,buffer + total,N - total);

		if (ret == 0) {
			DEBUG(10,("read_data_until: read of %d returned 0. Error = %s\n", (int)(N - total), strerror(errno) ));
			smb_read_error = READ_EOF;
			return 0;
		}

		if (ret == -1) {
			if (errno == EAGAIN) {
				/* Non-blocking socket with no data available. Try select again. */
				continue;
			}
			DEBUG(0,("read_data_until: read failure for %d. Error = %s\n", (int)(N - total), strerror(errno) ));
			smb_read_error = READ_ERROR;
			return -1;
		}
		total += ret;
	}
	return (ssize_t)total;
}
#endif

/****************************************************************************
 Read data from a socket with a timout in msec.
 mincount = if timeout, minimum to read before returning
 maxcount = number to be read.
 time_out = timeout in milliseconds
****************************************************************************/

ssize_t read_socket_with_timeout(int fd,char *buf,size_t mincnt,size_t maxcnt,unsigned int time_out)
{
	fd_set fds;
	int selrtn;
	ssize_t readret;
	size_t nread = 0;
	struct timeval timeout;
	
	/* just checking .... */
	if (maxcnt <= 0)
		return(0);
	
	smb_read_error = 0;
	
	/* Blocking read */
	if (time_out == 0) {
		if (mincnt == 0) {
			mincnt = maxcnt;
		}
		
		while (nread < mincnt) {
			readret = sys_read(fd, buf + nread, maxcnt - nread);
			
			if (readret == 0) {
				DEBUG(5,("read_socket_with_timeout: blocking read. EOF from client.\n"));
				smb_read_error = READ_EOF;
				return -1;
			}
			
			if (readret == -1) {
				if (fd == client_fd) {
					/* Try and give an error message saying what client failed. */
					DEBUG(0,("read_socket_with_timeout: client %s read error = %s.\n",
						client_ip_string, strerror(errno) ));
				} else {
					DEBUG(0,("read_socket_with_timeout: read error = %s.\n", strerror(errno) ));
				}
				smb_read_error = READ_ERROR;
				return -1;
			}
			nread += readret;
		}
		return((ssize_t)nread);
	}
	
	/* Most difficult - timeout read */
	/* If this is ever called on a disk file and 
	   mincnt is greater then the filesize then
	   system performance will suffer severely as 
	   select always returns true on disk files */
	
	/* Set initial timeout */
	timeout.tv_sec = (time_t)(time_out / 1000);
	timeout.tv_usec = (long)(1000 * (time_out % 1000));
	
	for (nread=0; nread < mincnt; ) {      
		FD_ZERO(&fds);
		FD_SET(fd,&fds);
		
		selrtn = sys_select_intr(fd+1,&fds,NULL,NULL,&timeout);
		
		/* Check if error */
		if (selrtn == -1) {
			/* something is wrong. Maybe the socket is dead? */
			if (fd == client_fd) {
				/* Try and give an error message saying what client failed. */
				DEBUG(0,("read_socket_with_timeout: timeout read for client %s. select error = %s.\n",
					client_ip_string, strerror(errno) ));
			} else {
				DEBUG(0,("read_socket_with_timeout: timeout read. select error = %s.\n", strerror(errno) ));
			}
			smb_read_error = READ_ERROR;
			return -1;
		}
		
		/* Did we timeout ? */
		if (selrtn == 0) {
			DEBUG(10,("read_socket_with_timeout: timeout read. select timed out.\n"));
			smb_read_error = READ_TIMEOUT;
			return -1;
		}
		
		readret = sys_read(fd, buf+nread, maxcnt-nread);
		
		if (readret == 0) {
			/* we got EOF on the file descriptor */
			DEBUG(5,("read_socket_with_timeout: timeout read. EOF from client.\n"));
			smb_read_error = READ_EOF;
			return -1;
		}
		
		if (readret == -1) {
			/* the descriptor is probably dead */
			if (fd == client_fd) {
				/* Try and give an error message saying what client failed. */
				DEBUG(0,("read_socket_with_timeout: timeout read to client %s. read error = %s.\n",
					client_ip_string, strerror(errno) ));
			} else {
				DEBUG(0,("read_socket_with_timeout: timeout read. read error = %s.\n", strerror(errno) ));
			}
			smb_read_error = READ_ERROR;
			return -1;
		}
		
		nread += readret;
	}
	
	/* Return the number we got */
	return (ssize_t)nread;
}

/****************************************************************************
 Read data from the client, reading exactly N bytes. 
****************************************************************************/

ssize_t read_data(int fd,char *buffer,size_t N)
{
	ssize_t ret;
	size_t total=0;  
 
	smb_read_error = 0;

	while (total < N) {
		ret = sys_read(fd,buffer + total,N - total);

		if (ret == 0) {
			DEBUG(10,("read_data: read of %d returned 0. Error = %s\n", (int)(N - total), strerror(errno) ));
			smb_read_error = READ_EOF;
			return 0;
		}

		if (ret == -1) {
			if (fd == client_fd) {
				/* Try and give an error message saying what client failed. */
				DEBUG(0,("read_data: read failure for %d bytes to client %s. Error = %s\n",
					(int)(N - total), client_ip_string, strerror(errno) ));
			} else {
				DEBUG(0,("read_data: read failure for %d. Error = %s\n", (int)(N - total), strerror(errno) ));
			}
			smb_read_error = READ_ERROR;
			return -1;
		}
		total += ret;
	}
	return (ssize_t)total;
}

/****************************************************************************
 Write data to a fd.
****************************************************************************/

ssize_t write_data(int fd, const char *buffer, size_t N)
{
	size_t total=0;
	ssize_t ret;

	while (total < N) {
		ret = sys_write(fd,buffer + total,N - total);

		if (ret == -1) {
			if (fd == client_fd) {
				/* Try and give an error message saying what client failed. */
				DEBUG(0,("write_data: write failure in writing to client %s. Error %s\n",
					client_ip_string, strerror(errno) ));
			} else {
				DEBUG(0,("write_data: write failure. Error = %s\n", strerror(errno) ));
			}
			return -1;
		}

		if (ret == 0) {
			return total;
		}

		total += ret;
	}
	return (ssize_t)total;
}

/****************************************************************************
 Send a keepalive packet (rfc1002).
****************************************************************************/

BOOL send_keepalive(int client)
{
	unsigned char buf[4];

	buf[0] = SMBkeepalive;
	buf[1] = buf[2] = buf[3] = 0;

	return(write_data(client,(char *)buf,4) == 4);
}


/****************************************************************************
 Read 4 bytes of a smb packet and return the smb length of the packet.
 Store the result in the buffer.
 This version of the function will return a length of zero on receiving
 a keepalive packet.
 Timeout is in milliseconds.
****************************************************************************/

static ssize_t read_smb_length_return_keepalive(int fd, char *inbuf, unsigned int timeout)
{
	ssize_t len=0;
	int msg_type;
	BOOL ok = False;

	while (!ok) {
		if (timeout > 0)
			ok = (read_socket_with_timeout(fd,inbuf,4,4,timeout) == 4);
		else 
			ok = (read_data(fd,inbuf,4) == 4);

		if (!ok)
			return(-1);

		len = smb_len(inbuf);
		msg_type = CVAL(inbuf,0);

		if (msg_type == SMBkeepalive) 
			DEBUG(5,("Got keepalive packet\n"));
	}

	DEBUG(10,("got smb length of %lu\n",(unsigned long)len));

	return(len);
}

/****************************************************************************
 Read 4 bytes of a smb packet and return the smb length of the packet.
 Store the result in the buffer. This version of the function will
 never return a session keepalive (length of zero).
 Timeout is in milliseconds.
****************************************************************************/

ssize_t read_smb_length(int fd, char *inbuf, unsigned int timeout)
{
	ssize_t len;

	for(;;) {
		len = read_smb_length_return_keepalive(fd, inbuf, timeout);

		if(len < 0)
			return len;

		/* Ignore session keepalives. */
		if(CVAL(inbuf,0) != SMBkeepalive)
			break;
	}

	DEBUG(10,("read_smb_length: got smb length of %lu\n",
		  (unsigned long)len));

	return len;
}

/****************************************************************************
 Read an smb from a fd. Note that the buffer *MUST* be of size
 BUFFER_SIZE+SAFETY_MARGIN.
 The timeout is in milliseconds. 
 This function will return on receipt of a session keepalive packet.
 Doesn't check the MAC on signed packets.
****************************************************************************/

BOOL receive_smb_raw(int fd, char *buffer, unsigned int timeout)
{
	ssize_t len,ret;

	smb_read_error = 0;

	len = read_smb_length_return_keepalive(fd,buffer,timeout);
	if (len < 0) {
		DEBUG(10,("receive_smb_raw: length < 0!\n"));

		/*
		 * Correct fix. smb_read_error may have already been
		 * set. Only set it here if not already set. Global
		 * variables still suck :-). JRA.
		 */

		if (smb_read_error == 0)
			smb_read_error = READ_ERROR;
		return False;
	}

	/*
	 * A WRITEX with CAP_LARGE_WRITEX can be 64k worth of data plus 65 bytes
	 * of header. Don't print the error if this fits.... JRA.
	 */

	if (len > (BUFFER_SIZE + LARGE_WRITEX_HDR_SIZE)) {
		DEBUG(0,("Invalid packet length! (%lu bytes).\n",(unsigned long)len));
		if (len > BUFFER_SIZE + (SAFETY_MARGIN/2)) {

			/*
			 * Correct fix. smb_read_error may have already been
			 * set. Only set it here if not already set. Global
			 * variables still suck :-). JRA.
			 */

			if (smb_read_error == 0)
				smb_read_error = READ_ERROR;
			return False;
		}
	}

	if(len > 0) {
		if (timeout > 0) {
			ret = read_socket_with_timeout(fd,buffer+4,len,len,timeout);
		} else {
			ret = read_data(fd,buffer+4,len);
		}

		if (ret != len) {
			if (smb_read_error == 0) {
				smb_read_error = READ_ERROR;
			}
			return False;
		}
		
		/* not all of samba3 properly checks for packet-termination of strings. This
		   ensures that we don't run off into empty space. */
		SSVAL(buffer+4,len, 0);
	}

	return True;
}

/****************************************************************************
 Wrapper for receive_smb_raw().
 Checks the MAC on signed packets.
****************************************************************************/

BOOL receive_smb(int fd, char *buffer, unsigned int timeout)
{
	if (!receive_smb_raw(fd, buffer, timeout)) {
		return False;
	}

	if (srv_encryption_on()) {
		NTSTATUS status = srv_decrypt_buffer(buffer);
		if (!NT_STATUS_IS_OK(status)) {
			DEBUG(0, ("receive_smb: SMB decryption failed on incoming packet! Error %s\n",
				nt_errstr(status) ));
			if (smb_read_error == 0) {
				smb_read_error = READ_BAD_DECRYPT;
			}
			return False;
		}
	}

	/* Check the incoming SMB signature. */
	if (!srv_check_sign_mac(buffer, True)) {
		DEBUG(0, ("receive_smb: SMB Signature verification failed on incoming packet!\n"));
		if (smb_read_error == 0) {
			smb_read_error = READ_BAD_SIG;
		}
		return False;
	}

	return True;
}

/****************************************************************************
 Send an smb to a fd.
****************************************************************************/

BOOL send_smb(int fd, char *buffer)
{
	size_t len;
	size_t nwritten=0;
	ssize_t ret;
	char *buf_out = buffer;

	/* Sign the outgoing packet if required. */
	srv_calculate_sign_mac(buf_out);

	if (srv_encryption_on()) {
		NTSTATUS status = srv_encrypt_buffer(buffer, &buf_out);
		if (!NT_STATUS_IS_OK(status)) {
			DEBUG(0, ("send_smb: SMB encryption failed on outgoing packet! Error %s\n",
				nt_errstr(status) ));
			return False;
		}
	}

	len = smb_len(buf_out) + 4;

	while (nwritten < len) {
		ret = write_data(fd,buf_out+nwritten,len - nwritten);
		if (ret <= 0) {
			DEBUG(0,("Error writing %d bytes to client. %d. (%s)\n",
				(int)len,(int)ret, strerror(errno) ));
			srv_free_enc_buffer(buf_out);
			return False;
		}
		nwritten += ret;
	}

	srv_free_enc_buffer(buf_out);
	return True;
}

/****************************************************************************
 Open a socket of the specified type, port, and address for incoming data.
****************************************************************************/

int open_socket_in( int type, int port, int dlevel, uint32 socket_addr, BOOL rebind )
{
	struct sockaddr_in sock;
	int res;

	memset( (char *)&sock, '\0', sizeof(sock) );

#ifdef HAVE_SOCK_SIN_LEN
	sock.sin_len         = sizeof(sock);
#endif
	sock.sin_port        = htons( port );
	sock.sin_family      = AF_INET;
	sock.sin_addr.s_addr = socket_addr;

	res = socket( AF_INET, type, 0 );
	if( res == -1 ) {
		if( DEBUGLVL(0) ) {
			dbgtext( "open_socket_in(): socket() call failed: " );
			dbgtext( "%s\n", strerror( errno ) );
		}
		return -1;
	}

	/* This block sets/clears the SO_REUSEADDR and possibly SO_REUSEPORT. */
	{
		int val = rebind ? 1 : 0;
		if( setsockopt(res,SOL_SOCKET,SO_REUSEADDR,(char *)&val,sizeof(val)) == -1 ) {
			if( DEBUGLVL( dlevel ) ) {
				dbgtext( "open_socket_in(): setsockopt: " );
				dbgtext( "SO_REUSEADDR = %s ", val?"True":"False" );
				dbgtext( "on port %d failed ", port );
				dbgtext( "with error = %s\n", strerror(errno) );
			}
		}
#ifdef SO_REUSEPORT
		if( setsockopt(res,SOL_SOCKET,SO_REUSEPORT,(char *)&val,sizeof(val)) == -1 ) {
			if( DEBUGLVL( dlevel ) ) {
				dbgtext( "open_socket_in(): setsockopt: ");
				dbgtext( "SO_REUSEPORT = %s ", val?"True":"False" );
				dbgtext( "on port %d failed ", port );
				dbgtext( "with error = %s\n", strerror(errno) );
			}
		}
#endif /* SO_REUSEPORT */
	}

	/* now we've got a socket - we need to bind it */
	if( bind( res, (struct sockaddr *)&sock, sizeof(sock) ) == -1 ) {
		if( DEBUGLVL(dlevel) && (port == SMB_PORT1 || port == SMB_PORT2 || port == NMB_PORT) ) {
			dbgtext( "bind failed on port %d ", port );
			dbgtext( "socket_addr = %s.\n", inet_ntoa( sock.sin_addr ) );
			dbgtext( "Error = %s\n", strerror(errno) );
		}
		close( res ); 
		return( -1 ); 
	}

	DEBUG( 10, ( "bind succeeded on port %d\n", port ) );

	return( res );
 }

/****************************************************************************
 Create an outgoing socket. timeout is in milliseconds.
**************************************************************************/

int open_socket_out(int type, struct in_addr *addr, int port ,int timeout)
{
	struct sockaddr_in sock_out;
	int res,ret;
	int connect_loop = 10;
	int increment = 10;

	/* create a socket to write to */
	res = socket(PF_INET, type, 0);
	if (res == -1) {
                DEBUG(0,("socket error (%s)\n", strerror(errno)));
		return -1;
	}

	if (type != SOCK_STREAM)
		return(res);
  
	memset((char *)&sock_out,'\0',sizeof(sock_out));
	putip((char *)&sock_out.sin_addr,(char *)addr);
  
	sock_out.sin_port = htons( port );
	sock_out.sin_family = PF_INET;

	/* set it non-blocking */
	set_blocking(res,False);

	DEBUG(3,("Connecting to %s at port %d\n",inet_ntoa(*addr),port));
  
	/* and connect it to the destination */
  connect_again:

	ret = connect(res,(struct sockaddr *)&sock_out,sizeof(sock_out));

	/* Some systems return EAGAIN when they mean EINPROGRESS */
	if (ret < 0 && (errno == EINPROGRESS || errno == EALREADY ||
			errno == EAGAIN) && (connect_loop < timeout) ) {
		smb_msleep(connect_loop);
		timeout -= connect_loop;
		connect_loop += increment;
		if (increment < 250) {
			/* After 8 rounds we end up at a max of 255 msec */
			increment *= 1.5;
		}
		goto connect_again;
	}

	if (ret < 0 && (errno == EINPROGRESS || errno == EALREADY ||
			errno == EAGAIN)) {
		DEBUG(1,("timeout connecting to %s:%d\n",inet_ntoa(*addr),port));
		close(res);
		return -1;
	}

#ifdef EISCONN

	if (ret < 0 && errno == EISCONN) {
		errno = 0;
		ret = 0;
	}
#endif

	if (ret < 0) {
		DEBUG(2,("error connecting to %s:%d (%s)\n",
				inet_ntoa(*addr),port,strerror(errno)));
		close(res);
		return -1;
	}

	/* set it blocking again */
	set_blocking(res,True);

	return res;
}

/****************************************************************************
 Create an outgoing TCP socket to any of the addrs. This is for
 simultaneous connects to port 445 and 139 of a host or even a variety
 of DC's all of which are equivalent for our purposes.
**************************************************************************/

BOOL open_any_socket_out(struct sockaddr_in *addrs, int num_addrs,
			 int timeout, int *fd_index, int *fd)
{
	int i, resulting_index, res;
	int *sockets;
	BOOL good_connect;

	fd_set r_fds, wr_fds;
	struct timeval tv;
	int maxfd;

	int connect_loop = 10000; /* 10 milliseconds */

	timeout *= 1000; 	/* convert to microseconds */

	sockets = SMB_MALLOC_ARRAY(int, num_addrs);

	if (sockets == NULL)
		return False;

	resulting_index = -1;

	for (i=0; i<num_addrs; i++)
		sockets[i] = -1;

	for (i=0; i<num_addrs; i++) {
		sockets[i] = socket(PF_INET, SOCK_STREAM, 0);
		if (sockets[i] < 0)
			goto done;
		set_blocking(sockets[i], False);
	}

 connect_again:
	good_connect = False;

	for (i=0; i<num_addrs; i++) {

		if (sockets[i] == -1)
			continue;

		if (connect(sockets[i], (struct sockaddr *)&(addrs[i]),
			    sizeof(*addrs)) == 0) {
			/* Rather unlikely as we are non-blocking, but it
			 * might actually happen. */
			resulting_index = i;
			goto done;
		}

		if (errno == EINPROGRESS || errno == EALREADY ||
#ifdef EISCONN
			errno == EISCONN ||
#endif
		    errno == EAGAIN || errno == EINTR) {
			/* These are the error messages that something is
			   progressing. */
			good_connect = True;
		} else if (errno != 0) {
			/* There was a direct error */
			close(sockets[i]);
			sockets[i] = -1;
		}
	}

	if (!good_connect) {
		/* All of the connect's resulted in real error conditions */
		goto done;
	}

	/* Lets see if any of the connect attempts succeeded */

	maxfd = 0;
	FD_ZERO(&wr_fds);
	FD_ZERO(&r_fds);

	for (i=0; i<num_addrs; i++) {
		if (sockets[i] == -1)
			continue;
		FD_SET(sockets[i], &wr_fds);
		FD_SET(sockets[i], &r_fds);
		if (sockets[i]>maxfd)
			maxfd = sockets[i];
	}

	tv.tv_sec = 0;
	tv.tv_usec = connect_loop;

	res = sys_select_intr(maxfd+1, &r_fds, &wr_fds, NULL, &tv);

	if (res < 0)
		goto done;

	if (res == 0)
		goto next_round;

	for (i=0; i<num_addrs; i++) {

		if (sockets[i] == -1)
			continue;

		/* Stevens, Network Programming says that if there's a
		 * successful connect, the socket is only writable. Upon an
		 * error, it's both readable and writable. */

		if (FD_ISSET(sockets[i], &r_fds) &&
		    FD_ISSET(sockets[i], &wr_fds)) {
			/* readable and writable, so it's an error */
			close(sockets[i]);
			sockets[i] = -1;
			continue;
		}

		if (!FD_ISSET(sockets[i], &r_fds) &&
		    FD_ISSET(sockets[i], &wr_fds)) {
			/* Only writable, so it's connected */
			resulting_index = i;
			goto done;
		}
	}

 next_round:

	timeout -= connect_loop;
	if (timeout <= 0)
		goto done;
	connect_loop *= 1.5;
	if (connect_loop > timeout)
		connect_loop = timeout;
	goto connect_again;

 done:
	for (i=0; i<num_addrs; i++) {
		if (i == resulting_index)
			continue;
		if (sockets[i] >= 0)
			close(sockets[i]);
	}

	if (resulting_index >= 0) {
		*fd_index = resulting_index;
		*fd = sockets[*fd_index];
		set_blocking(*fd, True);
	}

	free(sockets);

	return (resulting_index >= 0);
}
/****************************************************************************
 Open a connected UDP socket to host on port
**************************************************************************/

int open_udp_socket(const char *host, int port)
{
	int type = SOCK_DGRAM;
	struct sockaddr_in sock_out;
	int res;
	struct in_addr *addr;

	addr = interpret_addr2(host);

	res = socket(PF_INET, type, 0);
	if (res == -1) {
		return -1;
	}

	memset((char *)&sock_out,'\0',sizeof(sock_out));
	putip((char *)&sock_out.sin_addr,(char *)addr);
	sock_out.sin_port = htons(port);
	sock_out.sin_family = PF_INET;

	if (connect(res,(struct sockaddr *)&sock_out,sizeof(sock_out))) {
		close(res);
		return -1;
	}

	return res;
}


/*******************************************************************
 Matchname - determine if host name matches IP address. Used to
 confirm a hostname lookup to prevent spoof attacks.
******************************************************************/

static BOOL matchname(char *remotehost,struct in_addr  addr)
{
	struct hostent *hp;
	int     i;
	
	if ((hp = sys_gethostbyname(remotehost)) == 0) {
		DEBUG(0,("sys_gethostbyname(%s): lookup failure.\n", remotehost));
		return False;
	} 

	/*
	 * Make sure that gethostbyname() returns the "correct" host name.
	 * Unfortunately, gethostbyname("localhost") sometimes yields
	 * "localhost.domain". Since the latter host name comes from the
	 * local DNS, we just have to trust it (all bets are off if the local
	 * DNS is perverted). We always check the address list, though.
	 */
	
	if (!strequal(remotehost, hp->h_name)
	    && !strequal(remotehost, "localhost")) {
		DEBUG(0,("host name/name mismatch: %s != %s\n",
			 remotehost, hp->h_name));
		return False;
	}
	
	/* Look up the host address in the address list we just got. */
	for (i = 0; hp->h_addr_list[i]; i++) {
		if (memcmp(hp->h_addr_list[i], (char *) & addr, sizeof(addr)) == 0)
			return True;
	}
	
	/*
	 * The host name does not map to the original host address. Perhaps
	 * someone has compromised a name server. More likely someone botched
	 * it, but that could be dangerous, too.
	 */
	
	DEBUG(0,("host name/address mismatch: %s != %s\n",
		 inet_ntoa(addr), hp->h_name));
	return False;
}

/*******************************************************************
 Return the DNS name of the remote end of a socket.
******************************************************************/

char *get_peer_name(int fd, BOOL force_lookup)
{
	static pstring name_buf;
	pstring tmp_name;
	static fstring addr_buf;
	struct hostent *hp;
	struct in_addr addr;
	char *p;

	/* reverse lookups can be *very* expensive, and in many
	   situations won't work because many networks don't link dhcp
	   with dns. To avoid the delay we avoid the lookup if
	   possible */
	if (!lp_hostname_lookups() && (force_lookup == False)) {
		return get_peer_addr(fd);
	}
	
	p = get_peer_addr(fd);

	/* it might be the same as the last one - save some DNS work */
	if (strcmp(p, addr_buf) == 0) 
		return name_buf;

	pstrcpy(name_buf,"UNKNOWN");
	if (fd == -1) 
		return name_buf;

	fstrcpy(addr_buf, p);

	addr = *interpret_addr2(p);
	
	/* Look up the remote host name. */
	if ((hp = gethostbyaddr((char *)&addr.s_addr, sizeof(addr.s_addr), AF_INET)) == 0) {
		DEBUG(1,("Gethostbyaddr failed for %s\n",p));
		pstrcpy(name_buf, p);
	} else {
		pstrcpy(name_buf,(char *)hp->h_name);
		if (!matchname(name_buf, addr)) {
			DEBUG(0,("Matchname failed on %s %s\n",name_buf,p));
			pstrcpy(name_buf,"UNKNOWN");
		}
	}

	/* can't pass the same source and dest strings in when you 
	   use --enable-developer or the clobber_region() call will 
	   get you */
	
	pstrcpy( tmp_name, name_buf );
	alpha_strcpy(name_buf, tmp_name, "_-.", sizeof(name_buf));
	if (strstr(name_buf,"..")) {
		pstrcpy(name_buf, "UNKNOWN");
	}

	return name_buf;
}

/*******************************************************************
 Return the IP addr of the remote end of a socket as a string.
 ******************************************************************/

char *get_peer_addr(int fd)
{
	struct sockaddr sa;
	struct sockaddr_in *sockin = (struct sockaddr_in *) (&sa);
	socklen_t length = sizeof(sa);
	static fstring addr_buf;

	fstrcpy(addr_buf,"0.0.0.0");

	if (fd == -1) {
		return addr_buf;
	}
	
	if (getpeername(fd, &sa, &length) < 0) {
		DEBUG(0,("getpeername failed. Error was %s\n", strerror(errno) ));
		return addr_buf;
	}
	
	fstrcpy(addr_buf,(char *)inet_ntoa(sockin->sin_addr));
	
	return addr_buf;
}

/*******************************************************************
 Create protected unix domain socket.

 Some unixes cannot set permissions on a ux-dom-sock, so we
 have to make sure that the directory contains the protection
 permissions instead.
 ******************************************************************/

int create_pipe_sock(const char *socket_dir,
		     const char *socket_name,
		     mode_t dir_perms)
{
#ifdef HAVE_UNIXSOCKET
	struct sockaddr_un sunaddr;
	struct stat st;
	int sock;
	mode_t old_umask;
	pstring path;
        
	old_umask = umask(0);
        
	/* Create the socket directory or reuse the existing one */
        
	if (lstat(socket_dir, &st) == -1) {
		if (errno == ENOENT) {
			/* Create directory */
			if (mkdir(socket_dir, dir_perms) == -1) {
				DEBUG(0, ("error creating socket directory "
					"%s: %s\n", socket_dir, 
					strerror(errno)));
				goto out_umask;
			}
		} else {
			DEBUG(0, ("lstat failed on socket directory %s: %s\n",
				socket_dir, strerror(errno)));
			goto out_umask;
		}
	} else {
		/* Check ownership and permission on existing directory */
		if (!S_ISDIR(st.st_mode)) {
			DEBUG(0, ("socket directory %s isn't a directory\n",
				socket_dir));
			goto out_umask;
		}
		if ((st.st_uid != sec_initial_uid()) || 
				((st.st_mode & 0777) != dir_perms)) {
			DEBUG(0, ("invalid permissions on socket directory "
				"%s\n", socket_dir));
			goto out_umask;
		}
	}
        
	/* Create the socket file */
        
	sock = socket(AF_UNIX, SOCK_STREAM, 0);
        
	if (sock == -1) {
		perror("socket");
                goto out_umask;
	}
        
	pstr_sprintf(path, "%s/%s", socket_dir, socket_name);
        
	unlink(path);
	memset(&sunaddr, 0, sizeof(sunaddr));
	sunaddr.sun_family = AF_UNIX;
	safe_strcpy(sunaddr.sun_path, path, sizeof(sunaddr.sun_path)-1);
        
	if (bind(sock, (struct sockaddr *)&sunaddr, sizeof(sunaddr)) == -1) {
		DEBUG(0, ("bind failed on pipe socket %s: %s\n", path,
			strerror(errno)));
		goto out_close;
	}
        
	if (listen(sock, 5) == -1) {
		DEBUG(0, ("listen failed on pipe socket %s: %s\n", path,
			strerror(errno)));
		goto out_close;
	}
        
	umask(old_umask);
	return sock;

out_close:
	close(sock);

out_umask:
	umask(old_umask);
	return -1;

#else
        DEBUG(0, ("create_pipe_sock: No Unix sockets on this system\n"));
        return -1;
#endif /* HAVE_UNIXSOCKET */
}