summaryrefslogtreecommitdiffstats
path: root/usr.sbin/inetd/inetd.c
blob: e8c7de259bd219abc8c0e48ae5c7eeaeed224e1a (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
/*
 * Copyright (c) 1983, 1991, 1993, 1994
 *	The Regents of the University of California.  All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 * 3. All advertising materials mentioning features or use of this software
 *    must display the following acknowledgement:
 *	This product includes software developed by the University of
 *	California, Berkeley and its contributors.
 * 4. Neither the name of the University nor the names of its contributors
 *    may be used to endorse or promote products derived from this software
 *    without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
 * SUCH DAMAGE.
 */

#ifndef lint
static char copyright[] __attribute__ ((unused)) =
"@(#) Copyright (c) 1983, 1991, 1993, 1994\n\
	The Regents of the University of California.  All rights reserved.\n";
#endif /* not lint */

#ifndef lint
/* from: @(#)inetd.c	8.4 (Berkeley) 4/13/94"; */
static char inetd_c_rcsid[] __attribute__ ((unused)) =
	"$FreeBSD$";
#endif /* not lint */

/*
 * Inetd - Internet super-server
 *
 * This program invokes all internet services as needed.  Connection-oriented
 * services are invoked each time a connection is made, by creating a process.
 * This process is passed the connection as file descriptor 0 and is expected
 * to do a getpeername to find out the source host and port.
 *
 * Datagram oriented services are invoked when a datagram
 * arrives; a process is created and passed a pending message
 * on file descriptor 0.  Datagram servers may either connect
 * to their peer, freeing up the original socket for inetd
 * to receive further messages on, or ``take over the socket'',
 * processing all arriving datagrams and, eventually, timing
 * out.	 The first type of server is said to be ``multi-threaded'';
 * the second type of server ``single-threaded''.
 *
 * Inetd uses a configuration file which is read at startup
 * and, possibly, at some later time in response to a hangup signal.
 * The configuration file is ``free format'' with fields given in the
 * order shown below.  Continuation lines for an entry must being with
 * a space or tab.  All fields must be present in each entry.
 *
 *	service name			must be in /etc/services or must
 *					name a tcpmux service
 *	socket type			stream/dgram/raw/rdm/seqpacket
 *	protocol			must be in /etc/protocols
 *	wait/nowait			single-threaded/multi-threaded
 *	user				user to run daemon as
 *	server program			full path name
 *	server program arguments	maximum of MAXARGS (20)
 *
 * TCP services without official port numbers are handled with the
 * RFC1078-based tcpmux internal service. Tcpmux listens on port 1 for
 * requests. When a connection is made from a foreign host, the service
 * requested is passed to tcpmux, which looks it up in the servtab list
 * and returns the proper entry for the service. Tcpmux returns a
 * negative reply if the service doesn't exist, otherwise the invoked
 * server is expected to return the positive reply if the service type in
 * inetd.conf file has the prefix "tcpmux/". If the service type has the
 * prefix "tcpmux/+", tcpmux will return the positive reply for the
 * process; this is for compatibility with older server code, and also
 * allows you to invoke programs that use stdin/stdout without putting any
 * special server code in them. Services that use tcpmux are "nowait"
 * because they do not have a well-known port and hence cannot listen
 * for new requests.
 *
 * For RPC services
 *	service name/version		must be in /etc/rpc
 *	socket type			stream/dgram/raw/rdm/seqpacket
 *	protocol			must be in /etc/protocols
 *	wait/nowait			single-threaded/multi-threaded
 *	user				user to run daemon as
 *	server program			full path name
 *	server program arguments	maximum of MAXARGS
 *
 * Comment lines are indicated by a `#' in column 1.
 */
#include <sys/param.h>
#include <sys/stat.h>
#include <sys/ioctl.h>
#include <sys/socket.h>
#include <sys/wait.h>
#include <sys/time.h>
#include <sys/resource.h>

#include <netinet/in.h>
#include <arpa/inet.h>
#include <rpc/rpc.h>
#include <rpc/pmap_clnt.h>

#include <errno.h>
#include <fcntl.h>
#include <netdb.h>
#include <pwd.h>
#include <signal.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <syslog.h>
#include <unistd.h>
#include <libutil.h>
#include <sysexits.h>

#ifdef LOGIN_CAP
#undef AUTH_NONE	/* conflicts with rpc stuff */
#include <login_cap.h>
#endif

#include "pathnames.h"

#define	TOOMANY		256		/* don't start more than TOOMANY */
#define	CNT_INTVL	60		/* servers in CNT_INTVL sec. */
#define	RETRYTIME	(60*10)		/* retry after bind or server fail */
#define MAX_MAXCHLD	32767		/* max allowable max children */

#define	SIGBLOCK	(sigmask(SIGCHLD)|sigmask(SIGHUP)|sigmask(SIGALRM))

int	debug = 0;
int	log = 0;
int	nsock, maxsock;
fd_set	allsock;
int	options;
int	timingout;
int	toomany = TOOMANY;
struct	servent *sp;
struct	rpcent *rpc;
struct	in_addr bind_address;

struct	servtab {
	char	*se_service;		/* name of service */
	int	se_socktype;		/* type of socket to use */
	char	*se_proto;		/* protocol used */
	short	se_maxchild;		/* max number of children */
	short	se_numchild;		/* current number of children */
	pid_t	*se_pids;		/* array of child pids */
	char	*se_user;		/* user name to run as */
	struct	biltin *se_bi;		/* if built-in, description */
	char	*se_server;		/* server program */
#define	MAXARGV 20
	char	*se_argv[MAXARGV+1];	/* program arguments */
	int	se_fd;			/* open descriptor */
	struct	sockaddr_in se_ctrladdr;/* bound address */
	u_char	se_type;		/* type: normal, mux, or mux+ */
	u_char	se_checked;		/* looked at during merge */
	u_char	se_accept;		/* i.e., wait/nowait mode */
	u_char	se_rpc;			/* ==1 if RPC service */
	int	se_rpc_prog;		/* RPC program number */
	u_int	se_rpc_lowvers;		/* RPC low version */
	u_int	se_rpc_highvers;	/* RPC high version */
	int	se_count;		/* number started since se_time */
	struct	timeval se_time;	/* start of se_count */
	struct	servtab *se_next;
} *servtab;

#define NORM_TYPE	0
#define MUX_TYPE	1
#define MUXPLUS_TYPE	2
#define ISMUX(sep)	(((sep)->se_type == MUX_TYPE) || \
			 ((sep)->se_type == MUXPLUS_TYPE))
#define ISMUXPLUS(sep)	((sep)->se_type == MUXPLUS_TYPE)


void		chargen_dg __P((int, struct servtab *));
void		chargen_stream __P((int, struct servtab *));
void		close_sep __P((struct servtab *));
void		config __P((int));
void		daytime_dg __P((int, struct servtab *));
void		daytime_stream __P((int, struct servtab *));
void		discard_dg __P((int, struct servtab *));
void		discard_stream __P((int, struct servtab *));
void		echo_dg __P((int, struct servtab *));
void		echo_stream __P((int, struct servtab *));
void		endconfig __P((void));
struct servtab *enter __P((struct servtab *));
void		freeconfig __P((struct servtab *));
struct servtab *getconfigent __P((void));
void		machtime_dg __P((int, struct servtab *));
void		machtime_stream __P((int, struct servtab *));
char	       *newstr __P((char *));
char	       *nextline __P((FILE *));
void		print_service __P((char *, struct servtab *));
void		addchild __P((struct servtab *, int));
void		reapchild __P((int));
void		enable __P((struct servtab *));
void		disable __P((struct servtab *));
void		retry __P((int));
int		setconfig __P((void));
void		setup __P((struct servtab *));
char	       *sskip __P((char **));
char	       *skip __P((char **));
struct servtab *tcpmux __P((int));

void		unregisterrpc __P((register struct servtab *sep));

struct biltin {
	char	*bi_service;		/* internally provided service name */
	int	bi_socktype;		/* type of socket supported */
	short	bi_fork;		/* 1 if should fork before call */
	short	bi_maxchild;		/* max number of children (default) */
	void	(*bi_fn)();		/* function which performs it */
} biltins[] = {
	/* Echo received data */
	{ "echo",	SOCK_STREAM,	1, 0,	echo_stream },
	{ "echo",	SOCK_DGRAM,	0, 0,	echo_dg },

	/* Internet /dev/null */
	{ "discard",	SOCK_STREAM,	1, 0,	discard_stream },
	{ "discard",	SOCK_DGRAM,	0, 0,	discard_dg },

	/* Return 32 bit time since 1970 */
	{ "time",	SOCK_STREAM,	0, 0,	machtime_stream },
	{ "time",	SOCK_DGRAM,	0, 0,	machtime_dg },

	/* Return human-readable time */
	{ "daytime",	SOCK_STREAM,	0, 0,	daytime_stream },
	{ "daytime",	SOCK_DGRAM,	0, 0,	daytime_dg },

	/* Familiar character generator */
	{ "chargen",	SOCK_STREAM,	1, 0,	chargen_stream },
	{ "chargen",	SOCK_DGRAM,	0, 0,	chargen_dg },

	{ "tcpmux",	SOCK_STREAM,	1, 0,	(void (*)())tcpmux },

	{ NULL }
};

#define NUMINT	(sizeof(intab) / sizeof(struct inent))
char	*CONFIG = _PATH_INETDCONF;
char	*pid_file = _PATH_INETDPID;

#ifdef OLD_SETPROCTITLE
char	**Argv;
char 	*LastArg;
#endif

int
main(argc, argv, envp)
	int argc;
	char *argv[], *envp[];
{
	struct servtab *sep;
	struct passwd *pwd;
	struct sigvec sv;
	int tmpint, ch, dofork;
	pid_t pid;
	char buf[50];
	struct  sockaddr_in peer;
	int i;
#ifdef LOGIN_CAP
	login_cap_t *lc = NULL;
#endif


#ifdef OLD_SETPROCTITLE
	Argv = argv;
	if (envp == 0 || *envp == 0)
		envp = argv;
	while (*envp)
		envp++;
	LastArg = envp[-1] + strlen(envp[-1]);
#endif

	openlog("inetd", LOG_PID | LOG_NOWAIT, LOG_DAEMON);

	bind_address.s_addr = htonl(INADDR_ANY);
	while ((ch = getopt(argc, argv, "dlR:a:p:")) != EOF)
		switch(ch) {
		case 'd':
			debug = 1;
			options |= SO_DEBUG;
			break;
		case 'l':
			log = 1;
			break;
		case 'R': {	/* invocation rate */
			char *p;

			tmpint = strtol(optarg, &p, 0);
			if (tmpint < 1 || *p)
				syslog(LOG_ERR,
			         "-R %s: bad value for service invocation rate",
					optarg);
			else
				toomany = tmpint;
			break;
		}
		case 'a':
			if (!inet_aton(optarg, &bind_address)) {
				syslog(LOG_ERR,
			         "-a %s: invalid IP address", optarg);
				exit(EX_USAGE);
			}
			break;
		case 'p':
			pid_file = optarg;
			break;
		case '?':
		default:
			syslog(LOG_ERR,
				"usage: inetd [-dl] [-a address] [-R rate]"
				" [-p pidfile] [conf-file]");
			exit(EX_USAGE);
		}
	argc -= optind;
	argv += optind;

	if (argc > 0)
		CONFIG = argv[0];
	if (debug == 0) {
		FILE *fp;
		if (daemon(0, 0) < 0) {
			syslog(LOG_WARNING, "daemon(0,0) failed: %m");
		}
		/*
		 * In case somebody has started inetd manually, we need to
		 * clear the logname, so that old servers run as root do not
		 * get the user's logname..
		 */
		if (setlogin("") < 0) {
			syslog(LOG_WARNING, "cannot clear logname: %m");
			/* no big deal if it fails.. */
		}
		pid = getpid();
		fp = fopen(pid_file, "w");
		if (fp) {
			fprintf(fp, "%ld\n", (long)pid);
			fclose(fp);
		} else {
			syslog(LOG_WARNING, "%s: %m", pid_file);
		}
	}
	memset(&sv, 0, sizeof(sv));
	sv.sv_mask = SIGBLOCK;
	sv.sv_handler = retry;
	sigvec(SIGALRM, &sv, (struct sigvec *)0);
	config(SIGHUP);
	sv.sv_handler = config;
	sigvec(SIGHUP, &sv, (struct sigvec *)0);
	sv.sv_handler = reapchild;
	sigvec(SIGCHLD, &sv, (struct sigvec *)0);

	{
		/* space for daemons to overwrite environment for ps */
#define	DUMMYSIZE	100
		char dummy[DUMMYSIZE];

		(void)memset(dummy, 'x', DUMMYSIZE - 1);
		dummy[DUMMYSIZE - 1] = '\0';
		(void)setenv("inetd_dummy", dummy, 1);
	}

	for (;;) {
	    int n, ctrl;
	    fd_set readable;

	    if (nsock == 0) {
		(void) sigblock(SIGBLOCK);
		while (nsock == 0)
		    sigpause(0L);
		(void) sigsetmask(0L);
	    }
	    readable = allsock;
	    if ((n = select(maxsock + 1, &readable, (fd_set *)0,
		(fd_set *)0, (struct timeval *)0)) <= 0) {
		    if (n < 0 && errno != EINTR)
			syslog(LOG_WARNING, "select: %m");
		    sleep(1);
		    continue;
	    }
	    for (sep = servtab; n && sep; sep = sep->se_next)
	        if (sep->se_fd != -1 && FD_ISSET(sep->se_fd, &readable)) {
		    n--;
		    if (debug)
			    fprintf(stderr, "someone wants %s\n",
				sep->se_service);
		    if (sep->se_accept && sep->se_socktype == SOCK_STREAM) {
			    ctrl = accept(sep->se_fd, (struct sockaddr *)0,
				(int *)0);
			    if (debug)
				    fprintf(stderr, "accept, ctrl %d\n", ctrl);
			    if (ctrl < 0) {
				    if (errno != EINTR)
					    syslog(LOG_WARNING,
						"accept (for %s): %m",
						sep->se_service);
				    continue;
			    }
			    if (log) {
				i = sizeof peer;
				if(getpeername(ctrl, (struct sockaddr *)
						&peer, &i)) {
					syslog(LOG_WARNING,
						"getpeername(for %s): %m",
						sep->se_service);
					continue;
				}
				syslog(LOG_INFO,"%s from %s",
					sep->se_service,
					inet_ntoa(peer.sin_addr));
			    }
			    /*
			     * Call tcpmux to find the real service to exec.
			     */
			    if (sep->se_bi &&
				sep->se_bi->bi_fn == (void (*)()) tcpmux) {
				    struct servtab *tsep;

				    tsep = tcpmux(ctrl);
				    if (tsep == NULL) {
					    close(ctrl);
					    continue;
				    }
				    sep = tsep;
			    }
		    } else
			    ctrl = sep->se_fd;
		    (void) sigblock(SIGBLOCK);
		    pid = 0;
		    dofork = (sep->se_bi == 0 || sep->se_bi->bi_fork);
		    if (dofork) {
			    if (sep->se_count++ == 0)
				(void)gettimeofday(&sep->se_time,
				    (struct timezone *)0);
			    else if (sep->se_count >= toomany) {
				struct timeval now;

				(void)gettimeofday(&now, (struct timezone *)0);
				if (now.tv_sec - sep->se_time.tv_sec >
				    CNT_INTVL) {
					sep->se_time = now;
					sep->se_count = 1;
				} else {
					syslog(LOG_ERR,
			"%s/%s server failing (looping), service terminated",
					    sep->se_service, sep->se_proto);
					close_sep(sep);
					sigsetmask(0L);
					if (!timingout) {
						timingout = 1;
						alarm(RETRYTIME);
					}
					continue;
				}
			    }
			    pid = fork();
		    }
		    if (pid < 0) {
			    syslog(LOG_ERR, "fork: %m");
			    if (sep->se_accept &&
				sep->se_socktype == SOCK_STREAM)
				    close(ctrl);
			    sigsetmask(0L);
			    sleep(1);
			    continue;
		    }
		    if (pid)
			addchild(sep, pid);
		    sigsetmask(0L);
		    if (pid == 0) {
			    if (dofork) {
				if (debug)
					fprintf(stderr, "+ Closing from %d\n",
						maxsock);
				for (tmpint = maxsock; tmpint > 2; tmpint--)
					if (tmpint != ctrl)
						(void) close(tmpint);
			    }
			    if (sep->se_bi) {
				(*sep->se_bi->bi_fn)(ctrl, sep);
				/* NOTREACHED */
			    } else {
				if (debug)
					fprintf(stderr, "%d execl %s\n",
					    getpid(), sep->se_server);
				dup2(ctrl, 0);
				close(ctrl);
				dup2(0, 1);
				dup2(0, 2);
				if ((pwd = getpwnam(sep->se_user)) == NULL) {
					syslog(LOG_ERR,
					    "%s/%s: %s: No such user",
						sep->se_service, sep->se_proto,
						sep->se_user);
					if (sep->se_socktype != SOCK_STREAM)
						recv(0, buf, sizeof (buf), 0);
					_exit(EX_NOUSER);
				}
#ifdef LOGIN_CAP
				/*
				 * Establish the class now, falls back to
				 * the "default" if unavailable.
				 */
				lc = login_getclass(pwd);
#endif
				if (setsid() < 0) {
					syslog(LOG_ERR,
						"%s: can't setsid(): %m",
						 sep->se_service);
					/* _exit(EX_OSERR); not fatal yet */
				}
#ifdef LOGIN_CAP
				if (setusercontext(lc, pwd, pwd->pw_uid,
				    LOGIN_SETALL) != 0) {
					syslog(LOG_ERR,
					 "%s: can't setusercontext(..%s..): %m",
					 sep->se_service, sep->se_user);
					_exit(EX_OSERR);
				}
#else
				if (pwd->pw_uid) {
					if (setlogin(sep->se_user) < 0) {
						syslog(LOG_ERR,
						 "%s: can't setlogin(%s): %m",
						 sep->se_service, sep->se_user);
						/* _exit(EX_OSERR); not yet */
					}
					if (setgid(pwd->pw_gid) < 0) {
						syslog(LOG_ERR,
						  "%s: can't set gid %d: %m",
						  sep->se_service, pwd->pw_gid);
						_exit(EX_OSERR);
					}
					(void) initgroups(pwd->pw_name,
							pwd->pw_gid);
					if (setuid(pwd->pw_uid) < 0) {
						syslog(LOG_ERR,
						  "%s: can't set uid %d: %m",
						  sep->se_service, pwd->pw_uid);
						_exit(EX_OSERR);
					}
				}
#endif
				execv(sep->se_server, sep->se_argv);
				if (sep->se_socktype != SOCK_STREAM)
					recv(0, buf, sizeof (buf), 0);
				syslog(LOG_ERR,
				    "cannot execute %s: %m", sep->se_server);
				_exit(EX_OSERR);
			    }
		    }
		    if (sep->se_accept && sep->se_socktype == SOCK_STREAM)
			    close(ctrl);
		}
	}
}

/*
 * Record a new child pid for this service. If we've reached the
 * limit on children, then stop accepting incoming requests.
 */

void
addchild(struct servtab *sep, pid_t pid)
{
#ifdef SANITY_CHECK
	if (sep->se_numchild >= sep->se_maxchild) {
		syslog(LOG_ERR, "%s: %d >= %d",
		    __FUNCTION__, sep->se_numchild, sep->se_maxchild);
		exit(EX_SOFTWARE);
	}
#endif
	if (sep->se_maxchild == 0)
		return;
	sep->se_pids[sep->se_numchild++] = pid;
	if (sep->se_numchild == sep->se_maxchild)
		disable(sep);
}

/*
 * Some child process has exited. See if it's on somebody's list.
 */

void
reapchild(signo)
	int signo;
{
	int k, status;
	pid_t pid;
	struct servtab *sep;

	for (;;) {
		pid = wait3(&status, WNOHANG, (struct rusage *)0);
		if (pid <= 0)
			break;
		if (debug)
			fprintf(stderr, "%d reaped, status %#x\n",
				pid, status);
		for (sep = servtab; sep; sep = sep->se_next) {
			for (k = 0; k < sep->se_numchild; k++)
				if (sep->se_pids[k] == pid)
					break;
			if (k == sep->se_numchild)
				continue;
			if (sep->se_numchild == sep->se_maxchild)
				enable(sep);
			sep->se_pids[k] = sep->se_pids[--sep->se_numchild];
			if (status)
				syslog(LOG_WARNING,
				    "%s[%d]: exit status 0x%x",
				    sep->se_server, pid, status);
			break;
		}
	}
}

void
config(signo)
	int signo;
{
	struct servtab *sep, *new, **sepp;
	struct passwd *pwd;
	long omask;

	if (!setconfig()) {
		syslog(LOG_ERR, "%s: %m", CONFIG);
		return;
	}
	for (sep = servtab; sep; sep = sep->se_next)
		sep->se_checked = 0;
	while ((new = getconfigent())) {
		if ((pwd = getpwnam(new->se_user)) == NULL) {
			syslog(LOG_ERR,
				"%s/%s: No such user '%s', service ignored",
				new->se_service, new->se_proto, new->se_user);
			continue;
		}
		for (sep = servtab; sep; sep = sep->se_next)
			if (strcmp(sep->se_service, new->se_service) == 0 &&
			    strcmp(sep->se_proto, new->se_proto) == 0)
				break;
		if (sep != 0) {
			int i;

#define SWAP(a, b) { typeof(a) c = a; a = b; b = c; }
			omask = sigblock(SIGBLOCK);
			/* copy over outstanding child pids */
			if (sep->se_maxchild && new->se_maxchild) {
				new->se_numchild = sep->se_numchild;
				if (new->se_numchild > new->se_maxchild)
					new->se_numchild = new->se_maxchild;
				memcpy(new->se_pids, sep->se_pids,
				    new->se_numchild * sizeof(*new->se_pids));
			}
			SWAP(sep->se_pids, new->se_pids);
			sep->se_maxchild = new->se_maxchild;
			sep->se_numchild = new->se_numchild;
			/* might need to turn on or off service now */
			if (sep->se_fd >= 0) {
			      if (sep->se_maxchild
				  && sep->se_numchild == sep->se_maxchild) {
				      if (FD_ISSET(sep->se_fd, &allsock))
					  disable(sep);
			      } else {
				      if (!FD_ISSET(sep->se_fd, &allsock))
					  enable(sep);
			      }
			}
			sep->se_accept = new->se_accept;
			if (new->se_user)
				SWAP(sep->se_user, new->se_user);
			if (new->se_server)
				SWAP(sep->se_server, new->se_server);
			for (i = 0; i < MAXARGV; i++)
				SWAP(sep->se_argv[i], new->se_argv[i]);
			sigsetmask(omask);
			freeconfig(new);
			if (debug)
				print_service("REDO", sep);
		} else {
			sep = enter(new);
			if (debug)
				print_service("ADD ", sep);
		}
		sep->se_checked = 1;
		if (ISMUX(sep)) {
			sep->se_fd = -1;
			continue;
		}
		if (!sep->se_rpc) {
			sp = getservbyname(sep->se_service, sep->se_proto);
			if (sp == 0) {
				syslog(LOG_ERR, "%s/%s: unknown service",
			    	sep->se_service, sep->se_proto);
				sep->se_checked = 0;
				continue;
			}
			if (sp->s_port != sep->se_ctrladdr.sin_port) {
				sep->se_ctrladdr.sin_family = AF_INET;
				sep->se_ctrladdr.sin_addr = bind_address;
				sep->se_ctrladdr.sin_port = sp->s_port;
				if (sep->se_fd >= 0)
					close_sep(sep);
			}
		} else {
			rpc = getrpcbyname(sep->se_service);
			if (rpc == 0) {
				syslog(LOG_ERR, "%s/%s unknown RPC service.",
					sep->se_service, sep->se_proto);
				if (sep->se_fd != -1)
					(void) close(sep->se_fd);
				sep->se_fd = -1;
					continue;
			}
			if (rpc->r_number != sep->se_rpc_prog) {
				if (sep->se_rpc_prog)
					unregisterrpc(sep);
				sep->se_rpc_prog = rpc->r_number;
				if (sep->se_fd != -1)
					(void) close(sep->se_fd);
				sep->se_fd = -1;
			}
		}
		if (sep->se_fd == -1)
			setup(sep);
	}
	endconfig();
	/*
	 * Purge anything not looked at above.
	 */
	omask = sigblock(SIGBLOCK);
	sepp = &servtab;
	while ((sep = *sepp)) {
		if (sep->se_checked) {
			sepp = &sep->se_next;
			continue;
		}
		*sepp = sep->se_next;
		if (sep->se_fd >= 0)
			close_sep(sep);
		if (debug)
			print_service("FREE", sep);
		if (sep->se_rpc && sep->se_rpc_prog > 0)
			unregisterrpc(sep);
		freeconfig(sep);
		free((char *)sep);
	}
	(void) sigsetmask(omask);
}

void
unregisterrpc(sep)
	struct servtab *sep;
{
        int i;
        struct servtab *sepp;
	long omask;

	omask = sigblock(SIGBLOCK);
        for (sepp = servtab; sepp; sepp = sepp->se_next) {
                if (sepp == sep)
                        continue;
		if (sep->se_checked == 0 ||
                    !sepp->se_rpc ||
                    sep->se_rpc_prog != sepp->se_rpc_prog)
			continue;
                return;
        }
        if (debug)
                print_service("UNREG", sep);
        for (i = sep->se_rpc_lowvers; i <= sep->se_rpc_highvers; i++)
                pmap_unset(sep->se_rpc_prog, i);
        if (sep->se_fd != -1)
                (void) close(sep->se_fd);
        sep->se_fd = -1;
	(void) sigsetmask(omask);
}

void
retry(signo)
	int signo;
{
	struct servtab *sep;

	timingout = 0;
	for (sep = servtab; sep; sep = sep->se_next)
		if (sep->se_fd == -1 && !ISMUX(sep))
			setup(sep);
}

void
setup(sep)
	struct servtab *sep;
{
	int on = 1;

	if ((sep->se_fd = socket(AF_INET, sep->se_socktype, 0)) < 0) {
		if (debug)
			fprintf(stderr, "socket failed on %s/%s: %s\n",
				sep->se_service, sep->se_proto,
				strerror(errno));
		syslog(LOG_ERR, "%s/%s: socket: %m",
		    sep->se_service, sep->se_proto);
		return;
	}
#define	turnon(fd, opt) \
setsockopt(fd, SOL_SOCKET, opt, (char *)&on, sizeof (on))
	if (strcmp(sep->se_proto, "tcp") == 0 && (options & SO_DEBUG) &&
	    turnon(sep->se_fd, SO_DEBUG) < 0)
		syslog(LOG_ERR, "setsockopt (SO_DEBUG): %m");
	if (turnon(sep->se_fd, SO_REUSEADDR) < 0)
		syslog(LOG_ERR, "setsockopt (SO_REUSEADDR): %m");
	if (turnon(sep->se_fd, SO_PRIVSTATE) < 0)
		syslog(LOG_ERR, "setsockopt (SO_PRIVSTATE): %m");
#undef turnon
	if (bind(sep->se_fd, (struct sockaddr *)&sep->se_ctrladdr,
	    sizeof (sep->se_ctrladdr)) < 0) {
		if (debug)
			fprintf(stderr, "bind failed on %s/%s: %s\n",
				sep->se_service, sep->se_proto,
				strerror(errno));
		syslog(LOG_ERR, "%s/%s: bind: %m",
		    sep->se_service, sep->se_proto);
		(void) close(sep->se_fd);
		sep->se_fd = -1;
		if (!timingout) {
			timingout = 1;
			alarm(RETRYTIME);
		}
		return;
	}
        if (sep->se_rpc) {
                int i, len = sizeof(struct sockaddr);

                if (getsockname(sep->se_fd,
				(struct sockaddr*)&sep->se_ctrladdr, &len) < 0){
                        syslog(LOG_ERR, "%s/%s: getsockname: %m",
                               sep->se_service, sep->se_proto);
                        (void) close(sep->se_fd);
                        sep->se_fd = -1;
                        return;
                }
                if (debug)
                        print_service("REG ", sep);
                for (i = sep->se_rpc_lowvers; i <= sep->se_rpc_highvers; i++) {
                        pmap_unset(sep->se_rpc_prog, i);
                        pmap_set(sep->se_rpc_prog, i,
                                 (sep->se_socktype == SOCK_DGRAM)
                                 ? IPPROTO_UDP : IPPROTO_TCP,
                                 ntohs(sep->se_ctrladdr.sin_port));
                }

        }
	if (sep->se_socktype == SOCK_STREAM)
		listen(sep->se_fd, 64);
	enable(sep);
	if (debug) {
		fprintf(stderr, "registered %s on %d\n",
			sep->se_server, sep->se_fd);
	}
}

/*
 * Finish with a service and its socket.
 */
void
close_sep(sep)
	struct servtab *sep;
{
	if (sep->se_fd >= 0) {
		if (FD_ISSET(sep->se_fd, &allsock))
			disable(sep);
		(void) close(sep->se_fd);
		sep->se_fd = -1;
	}
	sep->se_count = 0;
	sep->se_numchild = 0;	/* forget about any existing children */
}

struct servtab *
enter(cp)
	struct servtab *cp;
{
	struct servtab *sep;
	long omask;

	sep = (struct servtab *)malloc(sizeof (*sep));
	if (sep == (struct servtab *)0) {
		syslog(LOG_ERR, "Out of memory.");
		exit(EX_OSERR);
	}
	*sep = *cp;
	sep->se_fd = -1;
	omask = sigblock(SIGBLOCK);
	sep->se_next = servtab;
	servtab = sep;
	sigsetmask(omask);
	return (sep);
}

void
enable(struct servtab *sep)
{
	if (debug)
		fprintf(stderr,
		    "enabling %s, fd %d", sep->se_service, sep->se_fd);
#ifdef SANITY_CHECK
	if (sep->se_fd < 0) {
		syslog(LOG_ERR,
		    "%s: %s: bad fd", __FUNCTION__, sep->se_service);
		exit(EX_SOFTWARE);
	}
	if (ISMUX(sep)) {
		syslog(LOG_ERR,
		    "%s: %s: is mux", __FUNCTION__, sep->se_service);
		exit(EX_SOFTWARE);
	}
	if (FD_ISSET(sep->se_fd, &allsock)) {
		syslog(LOG_ERR,
		    "%s: %s: not off", __FUNCTION__, sep->se_service);
		exit(EX_SOFTWARE);
	}
#endif
	FD_SET(sep->se_fd, &allsock);
	nsock++;
	if (sep->se_fd > maxsock)
		maxsock = sep->se_fd;
}

void
disable(struct servtab *sep)
{
	if (debug)
		fprintf(stderr,
		    "disabling %s, fd %d", sep->se_service, sep->se_fd);
#ifdef SANITY_CHECK
	if (sep->se_fd < 0) {
		syslog(LOG_ERR,
		    "%s: %s: bad fd", __FUNCTION__, sep->se_service);
		exit(EX_SOFTWARE);
	}
	if (ISMUX(sep)) {
		syslog(LOG_ERR,
		    "%s: %s: is mux", __FUNCTION__, sep->se_service);
		exit(EX_SOFTWARE);
	}
	if (!FD_ISSET(sep->se_fd, &allsock)) {
		syslog(LOG_ERR,
		    "%s: %s: not on", __FUNCTION__, sep->se_service);
		exit(EX_SOFTWARE);
	}
	if (nsock == 0) {
		syslog(LOG_ERR, "%s: nsock=0", __FUNCTION__);
		exit(EX_SOFTWARE);
	}
#endif
	FD_CLR(sep->se_fd, &allsock);
	nsock--;
	if (sep->se_fd == maxsock)
		maxsock--;
}

FILE	*fconfig = NULL;
struct	servtab serv;
char	line[LINE_MAX];

int
setconfig()
{

	if (fconfig != NULL) {
		fseek(fconfig, 0L, SEEK_SET);
		return (1);
	}
	fconfig = fopen(CONFIG, "r");
	return (fconfig != NULL);
}

void
endconfig()
{
	if (fconfig) {
		(void) fclose(fconfig);
		fconfig = NULL;
	}
}

struct servtab *
getconfigent()
{
	struct servtab *sep = &serv;
	int argc;
	char *cp, *arg, *s;
	char *versp;
	static char TCPMUX_TOKEN[] = "tcpmux/";
#define MUX_LEN		(sizeof(TCPMUX_TOKEN)-1)

more:
	while ((cp = nextline(fconfig)) && (*cp == '#' || *cp == '\0'))
		;
	if (cp == NULL)
		return ((struct servtab *)0);
	/*
	 * clear the static buffer, since some fields (se_ctrladdr,
	 * for example) don't get initialized here.
	 */
	memset((caddr_t)sep, 0, sizeof *sep);
	arg = skip(&cp);
	if (cp == NULL) {
		/* got an empty line containing just blanks/tabs. */
		goto more;
	}
	if (strncmp(arg, TCPMUX_TOKEN, MUX_LEN) == 0) {
		char *c = arg + MUX_LEN;
		if (*c == '+') {
			sep->se_type = MUXPLUS_TYPE;
			c++;
		} else
			sep->se_type = MUX_TYPE;
		sep->se_service = newstr(c);
	} else {
		sep->se_service = newstr(arg);
		sep->se_type = NORM_TYPE;
	}
	arg = sskip(&cp);
	if (strcmp(arg, "stream") == 0)
		sep->se_socktype = SOCK_STREAM;
	else if (strcmp(arg, "dgram") == 0)
		sep->se_socktype = SOCK_DGRAM;
	else if (strcmp(arg, "rdm") == 0)
		sep->se_socktype = SOCK_RDM;
	else if (strcmp(arg, "seqpacket") == 0)
		sep->se_socktype = SOCK_SEQPACKET;
	else if (strcmp(arg, "raw") == 0)
		sep->se_socktype = SOCK_RAW;
	else
		sep->se_socktype = -1;
	sep->se_proto = newstr(sskip(&cp));
        if (strncmp(sep->se_proto, "rpc/", 4) == 0) {
                memmove(sep->se_proto, sep->se_proto + 4,
                    strlen(sep->se_proto) + 1 - 4);
                sep->se_rpc = 1;
                sep->se_rpc_prog = sep->se_rpc_lowvers =
			sep->se_rpc_lowvers = 0;
                sep->se_ctrladdr.sin_family = AF_INET;
                sep->se_ctrladdr.sin_port = 0;
                sep->se_ctrladdr.sin_addr = bind_address;
                if ((versp = rindex(sep->se_service, '/'))) {
                        *versp++ = '\0';
                        switch (sscanf(versp, "%d-%d",
                                       &sep->se_rpc_lowvers,
                                       &sep->se_rpc_highvers)) {
                        case 2:
                                break;
                        case 1:
                                sep->se_rpc_highvers =
                                        sep->se_rpc_lowvers;
                                break;
                        default:
                                syslog(LOG_ERR,
					"bad RPC version specifier; %s\n",
					sep->se_service);
                                freeconfig(sep);
                                goto more;
                        }
                }
                else {
                        sep->se_rpc_lowvers =
                                sep->se_rpc_highvers = 1;
                }
        }
	arg = sskip(&cp);
	if (!strncmp(arg, "wait", 4))
		sep->se_accept = 0;
	else if (!strncmp(arg, "nowait", 6))
		sep->se_accept = 1;
	else {
		syslog(LOG_ERR,
			"%s: bad wait/nowait for service %s",
			CONFIG, sep->se_service);
		goto more;
	}
	sep->se_maxchild = -1;
	if ((s = strchr(arg, '/')) != NULL) {
		char *eptr;
		u_long val;

		val = strtoul(s + 1, &eptr, 10);
		if (eptr == s + 1 || *eptr || val > MAX_MAXCHLD) {
			syslog(LOG_ERR,
				"%s: bad max-child for service %s",
				CONFIG, sep->se_service);
			goto more;
		}
		sep->se_maxchild = val;
	}
	if (ISMUX(sep)) {
		/*
		 * Silently enforce "nowait" mode for TCPMUX services
		 * since they don't have an assigned port to listen on.
		 */
		sep->se_accept = 1;
		if (strcmp(sep->se_proto, "tcp")) {
			syslog(LOG_ERR,
				"%s: bad protocol for tcpmux service %s",
				CONFIG, sep->se_service);
			goto more;
		}
		if (sep->se_socktype != SOCK_STREAM) {
			syslog(LOG_ERR,
				"%s: bad socket type for tcpmux service %s",
				CONFIG, sep->se_service);
			goto more;
		}
	}
	sep->se_user = newstr(sskip(&cp));
	sep->se_server = newstr(sskip(&cp));
	if (strcmp(sep->se_server, "internal") == 0) {
		struct biltin *bi;

		for (bi = biltins; bi->bi_service; bi++)
			if (bi->bi_socktype == sep->se_socktype &&
			    strcmp(bi->bi_service, sep->se_service) == 0)
				break;
		if (bi->bi_service == 0) {
			syslog(LOG_ERR, "internal service %s unknown",
				sep->se_service);
			goto more;
		}
		sep->se_accept = 1;	/* force accept mode for built-ins */
		sep->se_bi = bi;
	} else
		sep->se_bi = NULL;
	if (sep->se_maxchild < 0)	/* apply default max-children */
		if (sep->se_bi)
			sep->se_maxchild = sep->se_bi->bi_maxchild;
		else
			sep->se_maxchild = sep->se_accept ? 0 : 1;
	if (sep->se_maxchild) {
		sep->se_pids = malloc(sep->se_maxchild * sizeof(*sep->se_pids));
		if (sep->se_pids == NULL) {
			syslog(LOG_ERR, "Out of memory.");
			exit(EX_OSERR);
		}
	}
	argc = 0;
	for (arg = skip(&cp); cp; arg = skip(&cp))
		if (argc < MAXARGV) {
			sep->se_argv[argc++] = newstr(arg);
		} else {
			syslog(LOG_ERR,
				"%s: too many arguments for service %s",
				CONFIG, sep->se_service);
			goto more;
		}
	while (argc <= MAXARGV)
		sep->se_argv[argc++] = NULL;
	return (sep);
}

void
freeconfig(cp)
	struct servtab *cp;
{
	int i;

	if (cp->se_service)
		free(cp->se_service);
	if (cp->se_proto)
		free(cp->se_proto);
	if (cp->se_user)
		free(cp->se_user);
	if (cp->se_server)
		free(cp->se_server);
	if (cp->se_pids)
		free(cp->se_pids);
	for (i = 0; i < MAXARGV; i++)
		if (cp->se_argv[i])
			free(cp->se_argv[i]);
}


/*
 * Safe skip - if skip returns null, log a syntax error in the
 * configuration file and exit.
 */
char *
sskip(cpp)
	char **cpp;
{
	char *cp;

	cp = skip(cpp);
	if (cp == NULL) {
		syslog(LOG_ERR, "%s: syntax error", CONFIG);
		exit(EX_DATAERR);
	}
	return (cp);
}

char *
skip(cpp)
	char **cpp;
{
	char *cp = *cpp;
	char *start;
	char quote = '\0';

again:
	while (*cp == ' ' || *cp == '\t')
		cp++;
	if (*cp == '\0') {
		int c;

		c = getc(fconfig);
		(void) ungetc(c, fconfig);
		if (c == ' ' || c == '\t')
			if ((cp = nextline(fconfig)))
				goto again;
		*cpp = (char *)0;
		return ((char *)0);
	}
	if (*cp == '"' || *cp == '\'')
		quote = *cp++;
	start = cp;
	if (quote)
		while (*cp && *cp != quote)
			cp++;
	else
		while (*cp && *cp != ' ' && *cp != '\t')
			cp++;
	if (*cp != '\0')
		*cp++ = '\0';
	*cpp = cp;
	return (start);
}

char *
nextline(fd)
	FILE *fd;
{
	char *cp;

	if (fgets(line, sizeof (line), fd) == NULL)
		return ((char *)0);
	cp = strchr(line, '\n');
	if (cp)
		*cp = '\0';
	return (line);
}

char *
newstr(cp)
	char *cp;
{
	if ((cp = strdup(cp ? cp : "")))
		return (cp);
	syslog(LOG_ERR, "strdup: %m");
	exit(EX_OSERR);
}

#ifdef OLD_SETPROCTITLE
void
inetd_setproctitle(a, s)
	char *a;
	int s;
{
	int size;
	char *cp;
	struct sockaddr_in sin;
	char buf[80];

	cp = Argv[0];
	size = sizeof(sin);
	if (getpeername(s, (struct sockaddr *)&sin, &size) == 0)
		(void) sprintf(buf, "-%s [%s]", a, inet_ntoa(sin.sin_addr));
	else
		(void) sprintf(buf, "-%s", a);
	strncpy(cp, buf, LastArg - cp);
	cp += strlen(cp);
	while (cp < LastArg)
		*cp++ = ' ';
}
#else
void
inetd_setproctitle(a, s)
	char *a;
	int s;
{
	int size;
	struct sockaddr_in sin;
	char buf[80];

	size = sizeof(sin);
	if (getpeername(s, (struct sockaddr *)&sin, &size) == 0)
		(void) sprintf(buf, "%s [%s]", a, inet_ntoa(sin.sin_addr));
	else
		(void) sprintf(buf, "%s", a);
	setproctitle("%s", buf);
}
#endif


/*
 * Internet services provided internally by inetd:
 */
#define	BUFSIZE	8192

/* ARGSUSED */
void
echo_stream(s, sep)		/* Echo service -- echo data back */
	int s;
	struct servtab *sep;
{
	char buffer[BUFSIZE];
	int i;

	inetd_setproctitle(sep->se_service, s);
	while ((i = read(s, buffer, sizeof(buffer))) > 0 &&
	    write(s, buffer, i) > 0)
		;
	exit(0);
}

int check_loop(sin, sep)
	struct sockaddr_in *sin;
	struct servtab *sep;
{
	struct servtab *se2;

	for (se2 = servtab; se2; se2 = se2->se_next) {
		if (!se2->se_bi || se2->se_socktype != SOCK_DGRAM)
			continue;

		if (sin->sin_port == se2->se_ctrladdr.sin_port) {
			syslog(LOG_WARNING,
			       "%s/%s:%s/%s loop request REFUSED from %s",
			       sep->se_service, sep->se_proto,
			       se2->se_service, se2->se_proto,
			       inet_ntoa(sin->sin_addr));
			return 1;
		}
	}
	return 0;
}

/* ARGSUSED */
void
echo_dg(s, sep)			/* Echo service -- echo data back */
	int s;
	struct servtab *sep;
{
	char buffer[BUFSIZE];
	int i, size;
	struct sockaddr_in sin;

	size = sizeof(sin);
	if ((i = recvfrom(s, buffer, sizeof(buffer), 0,
			  (struct sockaddr *)&sin, &size)) < 0)
		return;

	if (check_loop(&sin, sep))
		return;

	(void) sendto(s, buffer, i, 0, (struct sockaddr *)&sin,
		      sizeof(sin));
}

/* ARGSUSED */
void
discard_stream(s, sep)		/* Discard service -- ignore data */
	int s;
	struct servtab *sep;
{
	int ret;
	char buffer[BUFSIZE];

	inetd_setproctitle(sep->se_service, s);
	while (1) {
		while ((ret = read(s, buffer, sizeof(buffer))) > 0)
			;
		if (ret == 0 || errno != EINTR)
			break;
	}
	exit(0);
}

/* ARGSUSED */
void
discard_dg(s, sep)		/* Discard service -- ignore data */
	int s;
	struct servtab *sep;
{
	char buffer[BUFSIZE];

	(void) read(s, buffer, sizeof(buffer));
}

#include <ctype.h>
#define LINESIZ 72
char ring[128];
char *endring;

void
initring()
{
	int i;

	endring = ring;

	for (i = 0; i <= 128; ++i)
		if (isprint(i))
			*endring++ = i;
}

/* ARGSUSED */
void
chargen_stream(s, sep)		/* Character generator */
	int s;
	struct servtab *sep;
{
	int len;
	char *rs, text[LINESIZ+2];

	inetd_setproctitle(sep->se_service, s);

	if (!endring) {
		initring();
		rs = ring;
	}

	text[LINESIZ] = '\r';
	text[LINESIZ + 1] = '\n';
	for (rs = ring;;) {
		if ((len = endring - rs) >= LINESIZ)
			memmove(text, rs, LINESIZ);
		else {
			memmove(text, rs, len);
			memmove(text + len, ring, LINESIZ - len);
		}
		if (++rs == endring)
			rs = ring;
		if (write(s, text, sizeof(text)) != sizeof(text))
			break;
	}
	exit(0);
}

/* ARGSUSED */
void
chargen_dg(s, sep)		/* Character generator */
	int s;
	struct servtab *sep;
{
	struct sockaddr_in sin;
	static char *rs;
	int len, size;
	char text[LINESIZ+2];

	if (endring == 0) {
		initring();
		rs = ring;
	}

	size = sizeof(sin);
	if (recvfrom(s, text, sizeof(text), 0,
		     (struct sockaddr *)&sin, &size) < 0)
		return;

	if (check_loop(&sin, sep))
		return;

	if ((len = endring - rs) >= LINESIZ)
		memmove(text, rs, LINESIZ);
	else {
		memmove(text, rs, len);
		memmove(text + len, ring, LINESIZ - len);
	}
	if (++rs == endring)
		rs = ring;
	text[LINESIZ] = '\r';
	text[LINESIZ + 1] = '\n';
	(void) sendto(s, text, sizeof(text), 0,
		      (struct sockaddr *)&sin, sizeof(sin));
}

/*
 * Return a machine readable date and time, in the form of the
 * number of seconds since midnight, Jan 1, 1900.  Since gettimeofday
 * returns the number of seconds since midnight, Jan 1, 1970,
 * we must add 2208988800 seconds to this figure to make up for
 * some seventy years Bell Labs was asleep.
 */

long
machtime()
{
	struct timeval tv;

	if (gettimeofday(&tv, (struct timezone *)0) < 0) {
		if (debug)
			fprintf(stderr, "Unable to get time of day\n");
		return (0L);
	}
#define	OFFSET ((u_long)25567 * 24*60*60)
	return (htonl((long)(tv.tv_sec + OFFSET)));
#undef OFFSET
}

/* ARGSUSED */
void
machtime_stream(s, sep)
	int s;
	struct servtab *sep;
{
	long result;

	result = machtime();
	(void) write(s, (char *) &result, sizeof(result));
}

/* ARGSUSED */
void
machtime_dg(s, sep)
	int s;
	struct servtab *sep;
{
	long result;
	struct sockaddr_in sin;
	int size;

	size = sizeof(sin);
	if (recvfrom(s, (char *)&result, sizeof(result), 0,
		     (struct sockaddr *)&sin, &size) < 0)
		return;

	if (check_loop(&sin, sep))
		return;

	result = machtime();
	(void) sendto(s, (char *) &result, sizeof(result), 0,
		      (struct sockaddr *)&sin, sizeof(sin));
}

/* ARGSUSED */
void
daytime_stream(s, sep)		/* Return human-readable time of day */
	int s;
	struct servtab *sep;
{
	char buffer[256];
	time_t clock;

	clock = time((time_t *) 0);

	(void) sprintf(buffer, "%.24s\r\n", ctime(&clock));
	(void) write(s, buffer, strlen(buffer));
}

/* ARGSUSED */
void
daytime_dg(s, sep)		/* Return human-readable time of day */
	int s;
	struct servtab *sep;
{
	char buffer[256];
	time_t clock;
	struct sockaddr_in sin;
	int size;

	clock = time((time_t *) 0);

	size = sizeof(sin);
	if (recvfrom(s, buffer, sizeof(buffer), 0,
		     (struct sockaddr *)&sin, &size) < 0)
		return;

	if (check_loop(&sin, sep))
		return;

	(void) sprintf(buffer, "%.24s\r\n", ctime(&clock));
	(void) sendto(s, buffer, strlen(buffer), 0,
		      (struct sockaddr *)&sin, sizeof(sin));
}

/*
 * print_service:
 *	Dump relevant information to stderr
 */
void
print_service(action, sep)
	char *action;
	struct servtab *sep;
{
	fprintf(stderr,
	    "%s: %s proto=%s accept=%d max=%d user=%s builtin=%x server=%s\n",
	    action, sep->se_service, sep->se_proto,
	    sep->se_accept, sep->se_maxchild, sep->se_user,
	    (int)sep->se_bi, sep->se_server);
}

/*
 *  Based on TCPMUX.C by Mark K. Lottor November 1988
 *  sri-nic::ps:<mkl>tcpmux.c
 */


static int		/* # of characters upto \r,\n or \0 */
getline(fd, buf, len)
	int fd;
	char *buf;
	int len;
{
	int count = 0, n;

	do {
		n = read(fd, buf, len-count);
		if (n == 0)
			return (count);
		if (n < 0)
			return (-1);
		while (--n >= 0) {
			if (*buf == '\r' || *buf == '\n' || *buf == '\0')
				return (count);
			count++;
			buf++;
		}
	} while (count < len);
	return (count);
}

#define MAX_SERV_LEN	(256+2)		/* 2 bytes for \r\n */

#define strwrite(fd, buf)	(void) write(fd, buf, sizeof(buf)-1)

struct servtab *
tcpmux(s)
	int s;
{
	struct servtab *sep;
	char service[MAX_SERV_LEN+1];
	int len;

	/* Get requested service name */
	if ((len = getline(s, service, MAX_SERV_LEN)) < 0) {
		strwrite(s, "-Error reading service name\r\n");
		return (NULL);
	}
	service[len] = '\0';

	if (debug)
		fprintf(stderr, "tcpmux: someone wants %s\n", service);

	/*
	 * Help is a required command, and lists available services,
	 * one per line.
	 */
	if (!strcasecmp(service, "help")) {
		for (sep = servtab; sep; sep = sep->se_next) {
			if (!ISMUX(sep))
				continue;
			(void)write(s,sep->se_service,strlen(sep->se_service));
			strwrite(s, "\r\n");
		}
		return (NULL);
	}

	/* Try matching a service in inetd.conf with the request */
	for (sep = servtab; sep; sep = sep->se_next) {
		if (!ISMUX(sep))
			continue;
		if (!strcasecmp(service, sep->se_service)) {
			if (ISMUXPLUS(sep)) {
				strwrite(s, "+Go\r\n");
			}
			return (sep);
		}
	}
	strwrite(s, "-Service not available\r\n");
	return (NULL);
}
OpenPOWER on IntegriCloud