-
Notifications
You must be signed in to change notification settings - Fork 0
/
Copy pathsocat.c
1520 lines (1419 loc) · 44.3 KB
/
socat.c
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
/* source: socat.c */
/* Copyright Gerhard Rieger and contributors (see file CHANGES) */
/* Published under the GNU General Public License V.2, see file COPYING */
/* this is the main source, including command line option parsing, general
control, and the data shuffler */
#include "config.h"
#include "xioconfig.h" /* what features are enabled */
#include "sysincludes.h"
#include "mytypes.h"
#include "compat.h"
#include "error.h"
#include "sycls.h"
#include "sysutils.h"
#include "dalan.h"
#include "filan.h"
#include "xio.h"
#include "xioopts.h"
#include "xiolockfile.h"
/* command line options */
struct {
size_t bufsiz;
bool verbose;
bool verbhex;
struct timeval pollintv; /* with ignoreeof, reread after seconds */
struct timeval closwait; /* after close of x, die after seconds */
struct timeval total_timeout;/* when nothing happens, die after seconds */
bool debug;
bool strictopts; /* stop on errors in address options */
char logopt; /* y..syslog; s..stderr; f..file; m..mixed */
bool lefttoright; /* first addr ro, second addr wo */
bool righttoleft; /* first addr wo, second addr ro */
xiolock_t lock; /* a lock file */
} socat_opts = {
8192, /* bufsiz */
false, /* verbose */
false, /* verbhex */
{1,0}, /* pollintv */
{0,500000}, /* closwait */
{0,0}, /* total_timeout */
0, /* debug */
0, /* strictopts */
's', /* logopt */
false, /* lefttoright */
false, /* righttoleft */
{ NULL, 0 }, /* lock */
};
void socat_usage(FILE *fd);
void socat_version(FILE *fd);
int socat(const char *address1, const char *address2);
int _socat(void);
int cv_newline(unsigned char **buff, ssize_t *bytes, int lineterm1, int lineterm2);
void socat_signal(int sig);
static int socat_sigchild(struct single *file);
void lftocrlf(char **in, ssize_t *len, size_t bufsiz);
void crlftolf(char **in, ssize_t *len, size_t bufsiz);
static int socat_lock(void);
static void socat_unlock(void);
static int socat_newchild(void);
static const char socatversion[] =
#include "./VERSION"
;
static const char timestamp[] = BUILD_DATE;
const char copyright_socat[] = "socat by Gerhard Rieger and contributors - see www.dest-unreach.org";
#if WITH_OPENSSL
const char copyright_openssl[] = "This product includes software developed by the OpenSSL Project for use in the OpenSSL Toolkit. (http://www.openssl.org/)";
const char copyright_ssleay[] = "This product includes software written by Tim Hudson ([email protected])";
#endif
bool havelock;
int main(int argc, const char *argv[]) {
const char **arg1, *a;
char *mainwaitstring;
char buff[10];
double rto;
int i, argc0, result;
struct utsname ubuf;
int lockrc;
if (mainwaitstring = getenv("SOCAT_MAIN_WAIT")) {
sleep(atoi(mainwaitstring));
}
diag_set('p', strchr(argv[0], '/') ? strrchr(argv[0], '/')+1 : argv[0]);
/* we must init before applying options because env settings have lower
priority and are to be overridden by options */
if (xioinitialize() != 0) {
Exit(1);
}
xiosetopt('p', "!!");
xiosetopt('o', ":");
argc0 = argc; /* save for later use */
arg1 = argv+1; --argc;
while (arg1[0] && (arg1[0][0] == '-')) {
switch (arg1[0][1]) {
case 'V': socat_version(stdout); Exit(0);
#if WITH_HELP
case '?':
case 'h':
socat_usage(stdout);
xioopenhelp(stdout, (arg1[0][2]=='?'||arg1[0][2]=='h') ? (arg1[0][3]=='?'||arg1[0][3]=='h') ? 2 : 1 : 0);
Exit(0);
#endif /* WITH_HELP */
case 'd': diag_set('d', NULL); break;
#if WITH_FILAN
case 'D': socat_opts.debug = true; break;
#endif
case 'l':
switch (arg1[0][2]) {
case 'm': /* mixed mode: stderr, then switch to syslog; + facility */
diag_set('s', NULL);
xiosetopt('l', "m");
socat_opts.logopt = arg1[0][2];
xiosetopt('y', &arg1[0][3]);
break;
case 'y': /* syslog + facility */
diag_set(arg1[0][2], &arg1[0][3]);
break;
case 'f': /* to file, +filename */
case 'p': /* artificial program name */
if (arg1[0][3]) {
diag_set(arg1[0][2], &arg1[0][3]);
} else if (arg1[1]) {
diag_set(arg1[0][2], arg1[1]);
++arg1, --argc;
} else {
Error1("option -l%c requires an argument; use option \"-h\" for help", arg1[0][2]);
}
break;
case 's': /* stderr */
diag_set(arg1[0][2], NULL);
break;
case 'u':
diag_set('u', NULL);
break;
case 'h':
diag_set_int('h', true);
break;
default:
Error1("unknown log option \"%s\"; use option \"-h\" for help", arg1[0]);
break;
}
break;
case 'v': socat_opts.verbose = true; break;
case 'x': socat_opts.verbhex = true; break;
case 'b': if (arg1[0][2]) {
a = *arg1+2;
} else {
++arg1, --argc;
if ((a = *arg1) == NULL) {
Error("option -b requires an argument; use option \"-h\" for help");
Exit(1);
}
}
socat_opts.bufsiz = strtoul(a, (char **)&a, 0);
break;
case 's':
diag_set_int('e', E_FATAL); break;
case 't': if (arg1[0][2]) {
a = *arg1+2;
} else {
++arg1, --argc;
if ((a = *arg1) == NULL) {
Error("option -t requires an argument; use option \"-h\" for help");
Exit(1);
}
}
rto = strtod(a, (char **)&a);
socat_opts.closwait.tv_sec = rto;
socat_opts.closwait.tv_usec =
(rto-socat_opts.closwait.tv_sec) * 1000000;
break;
case 'T': if (arg1[0][2]) {
a = *arg1+2;
} else {
++arg1, --argc;
if ((a = *arg1) == NULL) {
Error("option -T requires an argument; use option \"-h\" for help");
Exit(1);
}
}
rto = strtod(a, (char **)&a);
socat_opts.total_timeout.tv_sec = rto;
socat_opts.total_timeout.tv_usec =
(rto-socat_opts.total_timeout.tv_sec) * 1000000;
break;
case 'u': socat_opts.lefttoright = true; break;
case 'U': socat_opts.righttoleft = true; break;
case 'g': xioopts_ignoregroups = true; break;
case 'L': if (socat_opts.lock.lockfile)
Error("only one -L and -W option allowed");
if (arg1[0][2]) {
socat_opts.lock.lockfile = *arg1+2;
} else {
++arg1, --argc;
if ((socat_opts.lock.lockfile = *arg1) == NULL) {
Error("option -L requires an argument; use option \"-h\" for help");
Exit(1);
}
}
break;
case 'W': if (socat_opts.lock.lockfile)
Error("only one -L and -W option allowed");
if (arg1[0][2]) {
socat_opts.lock.lockfile = *arg1+2;
} else {
++arg1, --argc;
if ((socat_opts.lock.lockfile = *arg1) == NULL) {
Error("option -W requires an argument; use option \"-h\" for help");
Exit(1);
}
}
socat_opts.lock.waitlock = true;
socat_opts.lock.intervall.tv_sec = 1;
socat_opts.lock.intervall.tv_nsec = 0;
break;
#if WITH_IP4 || WITH_IP6
#if WITH_IP4
case '4':
#endif
#if WITH_IP6
case '6':
#endif
xioopts.default_ip = arg1[0][1];
xioopts.preferred_ip = arg1[0][1];
break;
#endif /* WITH_IP4 || WITH_IP6 */
case '\0':
case ',':
case ':': break; /* this "-" is a variation of STDIO */
default:
xioinqopt('p', buff, sizeof(buff));
if (arg1[0][1] == buff[0]) {
break;
}
Error1("unknown option \"%s\"; use option \"-h\" for help", arg1[0]);
Exit(1);
}
/* the leading "-" might be a form of the first address */
xioinqopt('p', buff, sizeof(buff));
if (arg1[0][0] == '-' &&
(arg1[0][1] == '\0' || arg1[0][1] == ':' ||
arg1[0][1] == ',' || arg1[0][1] == buff[0]))
break;
++arg1; --argc;
}
if (argc != 2) {
Error1("exactly 2 addresses required (there are %d); use option \"-h\" for help", argc);
Exit(1);
}
if (socat_opts.lefttoright && socat_opts.righttoleft) {
Error("-U and -u must not be combined");
}
xioinitialize2();
Info(copyright_socat);
#if WITH_OPENSSL
Info(copyright_openssl);
Info(copyright_ssleay);
#endif
Debug2("socat version %s on %s", socatversion, timestamp);
xiosetenv("VERSION", socatversion, 1, NULL); /* SOCAT_VERSION */
uname(&ubuf); /* ! here we circumvent internal tracing (Uname) */
Debug4("running on %s version %s, release %s, machine %s\n",
ubuf.sysname, ubuf.version, ubuf.release, ubuf.machine);
#if WITH_MSGLEVEL <= E_DEBUG
for (i = 0; i < argc0; ++i) {
Debug2("argv[%d]: \"%s\"", i, argv[i]);
}
#endif /* WITH_MSGLEVEL <= E_DEBUG */
{
struct sigaction act;
sigfillset(&act.sa_mask);
act.sa_flags = 0;
act.sa_handler = socat_signal;
/* not sure which signals should be caught and print a message */
Sigaction(SIGHUP, &act, NULL);
Sigaction(SIGINT, &act, NULL);
Sigaction(SIGQUIT, &act, NULL);
Sigaction(SIGILL, &act, NULL);
Sigaction(SIGABRT, &act, NULL);
Sigaction(SIGBUS, &act, NULL);
Sigaction(SIGFPE, &act, NULL);
Sigaction(SIGSEGV, &act, NULL);
Sigaction(SIGTERM, &act, NULL);
}
Signal(SIGPIPE, SIG_IGN);
/* set xio hooks */
xiohook_newchild = &socat_newchild;
if (lockrc = socat_lock()) {
/* =0: goon; >0: locked; <0: error, printed in sub */
if (lockrc > 0)
Error1("could not obtain lock \"%s\"", socat_opts.lock.lockfile);
Exit(1);
}
Atexit(socat_unlock);
result = socat(arg1[0], arg1[1]);
Notice1("exiting with status %d", result);
Exit(result);
return 0; /* not reached, just for gcc -Wall */
}
void socat_usage(FILE *fd) {
fputs(copyright_socat, fd); fputc('\n', fd);
fputs("Usage:\n", fd);
fputs("socat [options] <bi-address> <bi-address>\n", fd);
fputs(" options:\n", fd);
fputs(" -V print version and feature information to stdout, and exit\n", fd);
#if WITH_HELP
fputs(" -h|-? print a help text describing command line options and addresses\n", fd);
fputs(" -hh like -h, plus a list of all common address option names\n", fd);
fputs(" -hhh like -hh, plus a list of all available address option names\n", fd);
#endif /* WITH_HELP */
fputs(" -d increase verbosity (use up to 4 times; 2 are recommended)\n", fd);
#if WITH_FILAN
fputs(" -D analyze file descriptors before loop\n", fd);
#endif
fputs(" -ly[facility] log to syslog, using facility (default is daemon)\n", fd);
fputs(" -lf<logfile> log to file\n", fd);
fputs(" -ls log to stderr (default if no other log)\n", fd);
fputs(" -lm[facility] mixed log mode (stderr during initialization, then syslog)\n", fd);
fputs(" -lp<progname> set the program name used for logging\n", fd);
fputs(" -lu use microseconds for logging timestamps\n", fd);
fputs(" -lh add hostname to log messages\n", fd);
fputs(" -v verbose data traffic, text\n", fd);
fputs(" -x verbose data traffic, hexadecimal\n", fd);
fputs(" -b<size_t> set data buffer size (8192)\n", fd);
fputs(" -s sloppy (continue on error)\n", fd);
fputs(" -t<timeout> wait seconds before closing second channel\n", fd);
fputs(" -T<timeout> total inactivity timeout in seconds\n", fd);
fputs(" -u unidirectional mode (left to right)\n", fd);
fputs(" -U unidirectional mode (right to left)\n", fd);
fputs(" -g do not check option groups\n", fd);
fputs(" -L <lockfile> try to obtain lock, or fail\n", fd);
fputs(" -W <lockfile> try to obtain lock, or wait\n", fd);
#if WITH_IP4
fputs(" -4 prefer IPv4 if version is not explicitly specified\n", fd);
#endif
#if WITH_IP6
fputs(" -6 prefer IPv6 if version is not explicitly specified\n", fd);
#endif
}
void socat_version(FILE *fd) {
struct utsname ubuf;
fputs(copyright_socat, fd); fputc('\n', fd);
fprintf(fd, "socat version %s on %s\n", socatversion, timestamp);
Uname(&ubuf);
fprintf(fd, " running on %s version %s, release %s, machine %s\n",
ubuf.sysname, ubuf.version, ubuf.release, ubuf.machine);
fputs("features:\n", fd);
#ifdef WITH_STDIO
fprintf(fd, " #define WITH_STDIO %d\n", WITH_STDIO);
#else
fputs(" #undef WITH_STDIO\n", fd);
#endif
#ifdef WITH_FDNUM
fprintf(fd, " #define WITH_FDNUM %d\n", WITH_FDNUM);
#else
fputs(" #undef WITH_FDNUM\n", fd);
#endif
#ifdef WITH_FILE
fprintf(fd, " #define WITH_FILE %d\n", WITH_FILE);
#else
fputs(" #undef WITH_FILE\n", fd);
#endif
#ifdef WITH_CREAT
fprintf(fd, " #define WITH_CREAT %d\n", WITH_CREAT);
#else
fputs(" #undef WITH_CREAT\n", fd);
#endif
#ifdef WITH_GOPEN
fprintf(fd, " #define WITH_GOPEN %d\n", WITH_GOPEN);
#else
fputs(" #undef WITH_GOPEN\n", fd);
#endif
#ifdef WITH_TERMIOS
fprintf(fd, " #define WITH_TERMIOS %d\n", WITH_TERMIOS);
#else
fputs(" #undef WITH_TERMIOS\n", fd);
#endif
#ifdef WITH_PIPE
fprintf(fd, " #define WITH_PIPE %d\n", WITH_PIPE);
#else
fputs(" #undef WITH_PIPE\n", fd);
#endif
#ifdef WITH_UNIX
fprintf(fd, " #define WITH_UNIX %d\n", WITH_UNIX);
#else
fputs(" #undef WITH_UNIX\n", fd);
#endif /* WITH_UNIX */
#ifdef WITH_ABSTRACT_UNIXSOCKET
fprintf(fd, " #define WITH_ABSTRACT_UNIXSOCKET %d\n", WITH_ABSTRACT_UNIXSOCKET);
#else
fputs(" #undef WITH_ABSTRACT_UNIXSOCKET\n", fd);
#endif /* WITH_ABSTRACT_UNIXSOCKET */
#ifdef WITH_IP4
fprintf(fd, " #define WITH_IP4 %d\n", WITH_IP4);
#else
fputs(" #undef WITH_IP4\n", fd);
#endif
#ifdef WITH_IP6
fprintf(fd, " #define WITH_IP6 %d\n", WITH_IP6);
#else
fputs(" #undef WITH_IP6\n", fd);
#endif
#ifdef WITH_RAWIP
fprintf(fd, " #define WITH_RAWIP %d\n", WITH_RAWIP);
#else
fputs(" #undef WITH_RAWIP\n", fd);
#endif
#ifdef WITH_GENERICSOCKET
fprintf(fd, " #define WITH_GENERICSOCKET %d\n", WITH_GENERICSOCKET);
#else
fputs(" #undef WITH_GENERICSOCKET\n", fd);
#endif
#ifdef WITH_INTERFACE
fprintf(fd, " #define WITH_INTERFACE %d\n", WITH_INTERFACE);
#else
fputs(" #undef WITH_INTERFACE\n", fd);
#endif
#ifdef WITH_TCP
fprintf(fd, " #define WITH_TCP %d\n", WITH_TCP);
#else
fputs(" #undef WITH_TCP\n", fd);
#endif
#ifdef WITH_UDP
fprintf(fd, " #define WITH_UDP %d\n", WITH_UDP);
#else
fputs(" #undef WITH_UDP\n", fd);
#endif
#ifdef WITH_SCTP
fprintf(fd, " #define WITH_SCTP %d\n", WITH_SCTP);
#else
fputs(" #undef WITH_SCTP\n", fd);
#endif
#ifdef WITH_LISTEN
fprintf(fd, " #define WITH_LISTEN %d\n", WITH_LISTEN);
#else
fputs(" #undef WITH_LISTEN\n", fd);
#endif
#ifdef WITH_SOCKS4
fprintf(fd, " #define WITH_SOCKS4 %d\n", WITH_SOCKS4);
#else
fputs(" #undef WITH_SOCKS4\n", fd);
#endif
#ifdef WITH_SOCKS4A
fprintf(fd, " #define WITH_SOCKS4A %d\n", WITH_SOCKS4A);
#else
fputs(" #undef WITH_SOCKS4A\n", fd);
#endif
#ifdef WITH_PROXY
fprintf(fd, " #define WITH_PROXY %d\n", WITH_PROXY);
#else
fputs(" #undef WITH_PROXY\n", fd);
#endif
#ifdef WITH_SYSTEM
fprintf(fd, " #define WITH_SYSTEM %d\n", WITH_SYSTEM);
#else
fputs(" #undef WITH_SYSTEM\n", fd);
#endif
#ifdef WITH_EXEC
fprintf(fd, " #define WITH_EXEC %d\n", WITH_EXEC);
#else
fputs(" #undef WITH_EXEC\n", fd);
#endif
#ifdef WITH_READLINE
fprintf(fd, " #define WITH_READLINE %d\n", WITH_READLINE);
#else
fputs(" #undef WITH_READLINE\n", fd);
#endif
#ifdef WITH_TUN
fprintf(fd, " #define WITH_TUN %d\n", WITH_TUN);
#else
fputs(" #undef WITH_TUN\n", fd);
#endif
#ifdef WITH_PTY
fprintf(fd, " #define WITH_PTY %d\n", WITH_PTY);
#else
fputs(" #undef WITH_PTY\n", fd);
#endif
#ifdef WITH_OPENSSL
fprintf(fd, " #define WITH_OPENSSL %d\n", WITH_OPENSSL);
#else
fputs(" #undef WITH_OPENSSL\n", fd);
#endif
#ifdef WITH_FIPS
fprintf(fd, " #define WITH_FIPS %d\n", WITH_FIPS);
#else
fputs(" #undef WITH_FIPS\n", fd);
#endif
#ifdef WITH_LIBWRAP
fprintf(fd, " #define WITH_LIBWRAP %d\n", WITH_LIBWRAP);
#else
fputs(" #undef WITH_LIBWRAP\n", fd);
#endif
#ifdef WITH_SYCLS
fprintf(fd, " #define WITH_SYCLS %d\n", WITH_SYCLS);
#else
fputs(" #undef WITH_SYCLS\n", fd);
#endif
#ifdef WITH_FILAN
fprintf(fd, " #define WITH_FILAN %d\n", WITH_FILAN);
#else
fputs(" #undef WITH_FILAN\n", fd);
#endif
#ifdef WITH_RETRY
fprintf(fd, " #define WITH_RETRY %d\n", WITH_RETRY);
#else
fputs(" #undef WITH_RETRY\n", fd);
#endif
#ifdef WITH_MSGLEVEL
fprintf(fd, " #define WITH_MSGLEVEL %d /*%s*/\n", WITH_MSGLEVEL,
&"debug\0\0\0info\0\0\0\0notice\0\0warn\0\0\0\0error\0\0\0fatal\0\0\0"[WITH_MSGLEVEL<<3]);
#else
fputs(" #undef WITH_MSGLEVEL\n", fd);
#endif
}
xiofile_t *sock1, *sock2;
int closing = 0; /* 0..no eof yet, 1..first eof just occurred,
2..counting down closing timeout */
/* call this function when the common command line options are parsed, and the
addresses are extracted (but not resolved). */
int socat(const char *address1, const char *address2) {
int mayexec;
if (socat_opts.lefttoright) {
if ((sock1 = xioopen(address1, XIO_RDONLY|XIO_MAYFORK|XIO_MAYCHILD|XIO_MAYCONVERT)) == NULL) {
return -1;
}
xiosetsigchild(sock1, socat_sigchild);
} else if (socat_opts.righttoleft) {
if ((sock1 = xioopen(address1, XIO_WRONLY|XIO_MAYFORK|XIO_MAYCHILD|XIO_MAYCONVERT)) == NULL) {
return -1;
}
xiosetsigchild(sock1, socat_sigchild);
} else {
if ((sock1 = xioopen(address1, XIO_RDWR|XIO_MAYFORK|XIO_MAYCHILD|XIO_MAYCONVERT)) == NULL) {
return -1;
}
xiosetsigchild(sock1, socat_sigchild);
}
#if 1 /*! */
if (XIO_READABLE(sock1) &&
(XIO_RDSTREAM(sock1)->howtoend == END_KILL ||
XIO_RDSTREAM(sock1)->howtoend == END_CLOSE_KILL ||
XIO_RDSTREAM(sock1)->howtoend == END_SHUTDOWN_KILL)) {
if (XIO_RDSTREAM(sock1)->para.exec.pid == diedunknown1) {
/* child has alread died... but it might have put regular data into
the communication channel, so continue */
Info1("child "F_pid" has already died (diedunknown1)",
XIO_RDSTREAM(sock1)->para.exec.pid);
diedunknown1 = 0;
XIO_RDSTREAM(sock1)->para.exec.pid = 0;
/* return STAT_RETRYLATER; */
} else if (XIO_RDSTREAM(sock1)->para.exec.pid == diedunknown2) {
Info1("child "F_pid" has already died (diedunknown2)",
XIO_RDSTREAM(sock1)->para.exec.pid);
diedunknown2 = 0;
XIO_RDSTREAM(sock1)->para.exec.pid = 0;
} else if (XIO_RDSTREAM(sock1)->para.exec.pid == diedunknown3) {
Info1("child "F_pid" has already died (diedunknown3)",
XIO_RDSTREAM(sock1)->para.exec.pid);
diedunknown3 = 0;
XIO_RDSTREAM(sock1)->para.exec.pid = 0;
} else if (XIO_RDSTREAM(sock1)->para.exec.pid == diedunknown4) {
Info1("child "F_pid" has already died (diedunknown4)",
XIO_RDSTREAM(sock1)->para.exec.pid);
diedunknown4 = 0;
XIO_RDSTREAM(sock1)->para.exec.pid = 0;
}
}
#endif
mayexec = (sock1->common.flags&XIO_DOESCONVERT ? 0 : XIO_MAYEXEC);
if (XIO_WRITABLE(sock1)) {
if (XIO_READABLE(sock1)) {
if ((sock2 = xioopen(address2, XIO_RDWR|XIO_MAYFORK|XIO_MAYCHILD|mayexec|XIO_MAYCONVERT)) == NULL) {
return -1;
}
xiosetsigchild(sock2, socat_sigchild);
} else {
if ((sock2 = xioopen(address2, XIO_RDONLY|XIO_MAYFORK|XIO_MAYCHILD|mayexec|XIO_MAYCONVERT)) == NULL) {
return -1;
}
xiosetsigchild(sock2, socat_sigchild);
}
} else { /* assuming sock1 is readable */
if ((sock2 = xioopen(address2, XIO_WRONLY|XIO_MAYFORK|XIO_MAYCHILD|mayexec|XIO_MAYCONVERT)) == NULL) {
return -1;
}
xiosetsigchild(sock2, socat_sigchild);
}
#if 1 /*! */
if (XIO_READABLE(sock2) &&
(XIO_RDSTREAM(sock2)->howtoend == END_KILL ||
XIO_RDSTREAM(sock2)->howtoend == END_CLOSE_KILL ||
XIO_RDSTREAM(sock2)->howtoend == END_SHUTDOWN_KILL)) {
if (XIO_RDSTREAM(sock2)->para.exec.pid == diedunknown1) {
/* child has alread died... but it might have put regular data into
the communication channel, so continue */
Info1("child "F_pid" has already died (diedunknown1)",
XIO_RDSTREAM(sock2)->para.exec.pid);
diedunknown1 = 0;
XIO_RDSTREAM(sock2)->para.exec.pid = 0;
/* return STAT_RETRYLATER; */
} else if (XIO_RDSTREAM(sock2)->para.exec.pid == diedunknown2) {
Info1("child "F_pid" has already died (diedunknown2)",
XIO_RDSTREAM(sock2)->para.exec.pid);
diedunknown2 = 0;
XIO_RDSTREAM(sock2)->para.exec.pid = 0;
} else if (XIO_RDSTREAM(sock2)->para.exec.pid == diedunknown3) {
Info1("child "F_pid" has already died (diedunknown3)",
XIO_RDSTREAM(sock2)->para.exec.pid);
diedunknown3 = 0;
XIO_RDSTREAM(sock2)->para.exec.pid = 0;
} else if (XIO_RDSTREAM(sock2)->para.exec.pid == diedunknown4) {
Info1("child "F_pid" has already died (diedunknown4)",
XIO_RDSTREAM(sock2)->para.exec.pid);
diedunknown4 = 0;
XIO_RDSTREAM(sock2)->para.exec.pid = 0;
}
}
#endif
Info("resolved and opened all sock addresses");
return
_socat(); /* nsocks, sockets are visible outside function */
}
/* checks if this is a connection to a child process, and if so, sees if the
child already died, leaving some data for us.
returns <0 if an error occurred;
returns 0 if no child or not yet died or died without data (sets eof);
returns >0 if child died and left data
*/
int childleftdata(xiofile_t *xfd) {
struct pollfd in;
int retval;
/* have to check if a child process died before, but left read data */
if (XIO_READABLE(xfd) &&
(XIO_RDSTREAM(xfd)->howtoend == END_KILL ||
XIO_RDSTREAM(xfd)->howtoend == END_CLOSE_KILL ||
XIO_RDSTREAM(xfd)->howtoend == END_SHUTDOWN_KILL) &&
XIO_RDSTREAM(xfd)->para.exec.pid == 0) {
struct timeval timeout = { 0, 0 };
if (XIO_READABLE(xfd) && !(XIO_RDSTREAM(xfd)->eof >= 2 && !XIO_RDSTREAM(xfd)->ignoreeof)) {
in.fd = XIO_GETRDFD(xfd);
in.events = POLLIN/*|POLLRDBAND*/;
in.revents = 0;
}
do {
int _errno;
retval = xiopoll(&in, 1, &timeout);
_errno = errno; diag_flush(); errno = _errno; /* just in case it's not debug level and Msg() not been called */
} while (retval < 0 && errno == EINTR);
if (retval < 0) {
Error5("xiopoll({%d,%0o}, 1, {"F_tv_sec"."F_tv_usec"}): %s",
in.fd, in.events, timeout.tv_sec, timeout.tv_usec,
strerror(errno));
return -1;
}
if (retval == 0) {
Info("terminated child did not leave data for us");
XIO_RDSTREAM(xfd)->eof = 2;
xfd->stream.eof = 2;
closing = MAX(closing, 1);
}
}
return 0;
}
int xiotransfer(xiofile_t *inpipe, xiofile_t *outpipe,
unsigned char **buff, size_t bufsiz, bool righttoleft);
bool mayrd1; /* sock1 has read data or eof, according to poll() */
bool mayrd2; /* sock2 has read data or eof, according to poll() */
bool maywr1; /* sock1 can be written to, according to poll() */
bool maywr2; /* sock2 can be written to, according to poll() */
/* here we come when the sockets are opened (in the meaning of C language),
and their options are set/applied
returns -1 on error or 0 on success */
int _socat(void) {
struct pollfd fds[4],
*fd1in = &fds[0],
*fd1out = &fds[1],
*fd2in = &fds[2],
*fd2out = &fds[3];
int retval;
unsigned char *buff;
ssize_t bytes1, bytes2;
int polling = 0; /* handling ignoreeof */
int wasaction = 1; /* last poll was active, do NOT sleep before next */
struct timeval total_timeout; /* the actual total timeout timer */
#if WITH_FILAN
if (socat_opts.debug) {
int fdi, fdo;
int msglevel, exitlevel;
msglevel = diag_get_int('D'); /* save current message level */
diag_set_int('D', E_ERROR); /* only print errors and fatals in filan */
exitlevel = diag_get_int('e'); /* save current exit level */
diag_set_int('e', E_FATAL); /* only exit on fatals */
fdi = XIO_GETRDFD(sock1);
fdo = XIO_GETWRFD(sock1);
filan_fd(fdi, stderr);
if (fdo != fdi) {
filan_fd(fdo, stderr);
}
fdi = XIO_GETRDFD(sock2);
fdo = XIO_GETWRFD(sock2);
filan_fd(fdi, stderr);
if (fdo != fdi) {
filan_fd(fdo, stderr);
}
diag_set_int('e', exitlevel); /* restore old exit level */
diag_set_int('D', msglevel); /* restore old message level */
}
#endif /* WITH_FILAN */
/* when converting nl to crnl, size might double */
buff = Malloc(2*socat_opts.bufsiz+1);
if (buff == NULL) return -1;
if (socat_opts.logopt == 'm' && xioinqopt('l', NULL, 0) == 'm') {
Info("switching to syslog");
diag_set('y', xioopts.syslogfac);
xiosetopt('l', "\0");
}
total_timeout = socat_opts.total_timeout;
Notice4("starting data transfer loop with FDs [%d,%d] and [%d,%d]",
XIO_GETRDFD(sock1), XIO_GETWRFD(sock1),
XIO_GETRDFD(sock2), XIO_GETWRFD(sock2));
while (XIO_RDSTREAM(sock1)->eof <= 1 ||
XIO_RDSTREAM(sock2)->eof <= 1) {
struct timeval timeout, *to = NULL;
Debug6("data loop: sock1->eof=%d, sock2->eof=%d, closing=%d, wasaction=%d, total_to={"F_tv_sec"."F_tv_usec"}",
XIO_RDSTREAM(sock1)->eof, XIO_RDSTREAM(sock2)->eof,
closing, wasaction,
total_timeout.tv_sec, total_timeout.tv_usec);
/* for ignoreeof */
if (polling) {
if (!wasaction) {
if (socat_opts.total_timeout.tv_sec != 0 ||
socat_opts.total_timeout.tv_usec != 0) {
if (total_timeout.tv_usec < socat_opts.pollintv.tv_usec) {
total_timeout.tv_usec += 1000000;
total_timeout.tv_sec -= 1;
}
total_timeout.tv_sec -= socat_opts.pollintv.tv_sec;
total_timeout.tv_usec -= socat_opts.pollintv.tv_usec;
if (total_timeout.tv_sec < 0 ||
total_timeout.tv_sec == 0 && total_timeout.tv_usec < 0) {
Notice("inactivity timeout triggered");
free(buff);
return 0;
}
}
} else {
wasaction = 0;
}
}
if (polling) {
/* there is a ignoreeof poll timeout, use it */
timeout = socat_opts.pollintv;
to = &timeout;
} else if (socat_opts.total_timeout.tv_sec != 0 ||
socat_opts.total_timeout.tv_usec != 0) {
/* there might occur a total inactivity timeout */
timeout = socat_opts.total_timeout;
to = &timeout;
} else {
to = NULL;
}
if (closing>=1) {
/* first eof already occurred, start end timer */
timeout = socat_opts.pollintv;
to = &timeout;
closing = 2;
}
/* frame 1: set the poll parameters and loop over poll() EINTR) */
do { /* loop over poll() EINTR */
int _errno;
childleftdata(sock1);
childleftdata(sock2);
if (closing>=1) {
/* first eof already occurred, start end timer */
timeout = socat_opts.closwait;
to = &timeout;
closing = 2;
}
/* use the ignoreeof timeout if appropriate */
if (polling) {
if (closing == 0 ||
(socat_opts.pollintv.tv_sec < timeout.tv_sec) ||
((socat_opts.pollintv.tv_sec == timeout.tv_sec) &&
socat_opts.pollintv.tv_usec < timeout.tv_usec)) {
timeout = socat_opts.pollintv;
}
}
/* now the fds will be assigned */
if (XIO_READABLE(sock1) &&
!(XIO_RDSTREAM(sock1)->eof > 1 && !XIO_RDSTREAM(sock1)->ignoreeof) &&
!socat_opts.righttoleft) {
if (!mayrd1 && !(XIO_RDSTREAM(sock1)->eof > 1)) {
fd1in->fd = XIO_GETRDFD(sock1);
fd1in->events = POLLIN;
} else {
fd1in->fd = -1;
}
if (!maywr2) {
fd2out->fd = XIO_GETWRFD(sock2);
fd2out->events = POLLOUT;
} else {
fd2out->fd = -1;
}
} else {
fd1in->fd = -1;
fd2out->fd = -1;
}
if (XIO_READABLE(sock2) &&
!(XIO_RDSTREAM(sock2)->eof > 1 && !XIO_RDSTREAM(sock2)->ignoreeof) &&
!socat_opts.lefttoright) {
if (!mayrd2 && !(XIO_RDSTREAM(sock2)->eof > 1)) {
fd2in->fd = XIO_GETRDFD(sock2);
fd2in->events = POLLIN;
} else {
fd2in->fd = -1;
}
if (!maywr1) {
fd1out->fd = XIO_GETWRFD(sock1);
fd1out->events = POLLOUT;
} else {
fd1out->fd = -1;
}
} else {
fd1out->fd = -1;
fd2in->fd = -1;
}
/* frame 0: innermost part of the transfer loop: check FD status */
retval = xiopoll(fds, 4, to);
if (retval >= 0 || errno != EINTR) {
break;
}
_errno = errno;
Info1("poll(): %s", strerror(errno));
errno = _errno;
} while (true);
/* attention:
when an exec'd process sends data and terminates, it is unpredictable
whether the data or the sigchild arrives first.
*/
if (retval < 0) {
Error11("xiopoll({%d,%0o}{%d,%0o}{%d,%0o}{%d,%0o}, 4, {"F_tv_sec"."F_tv_usec"}): %s",
fds[0].fd, fds[0].events, fds[1].fd, fds[1].events,
fds[2].fd, fds[2].events, fds[3].fd, fds[3].events,
timeout.tv_sec, timeout.tv_usec, strerror(errno));
free(buff);
return -1;
} else if (retval == 0) {
Info2("poll timed out (no data within %ld.%06ld seconds)",
closing>=1?socat_opts.closwait.tv_sec:socat_opts.total_timeout.tv_sec,
closing>=1?socat_opts.closwait.tv_usec:socat_opts.total_timeout.tv_usec);
if (polling && !wasaction) {
/* there was a ignoreeof poll timeout, use it */
polling = 0; /*%%%*/
if (XIO_RDSTREAM(sock1)->ignoreeof) {
mayrd1 = 0;
}
if (XIO_RDSTREAM(sock2)->ignoreeof) {
mayrd2 = 0;
}
} else if (polling && wasaction) {
wasaction = 0;
} else if (socat_opts.total_timeout.tv_sec != 0 ||
socat_opts.total_timeout.tv_usec != 0) {
/* there was a total inactivity timeout */
Notice("inactivity timeout triggered");
free(buff);
return 0;
}
if (closing) {
break;
}
/* one possibility to come here is ignoreeof on some fd, but no EOF
and no data on any descriptor - this is no indication for end! */
continue;
}
if (XIO_READABLE(sock1) && XIO_GETRDFD(sock1) >= 0 &&
(fd1in->revents /*&(POLLIN|POLLHUP|POLLERR)*/)) {
if (fd1in->revents & POLLNVAL) {
/* this is what we find on Mac OS X when poll()'ing on a device or
named pipe. a read() might imm. return with 0 bytes, resulting
in a loop? */
Error1("poll(...[%d]: invalid request", fd1in->fd);
free(buff);
return -1;
}
mayrd1 = true;
}
if (XIO_READABLE(sock2) && XIO_GETRDFD(sock2) >= 0 &&
(fd2in->revents)) {
if (fd2in->revents & POLLNVAL) {
Error1("poll(...[%d]: invalid request", fd2in->fd);
free(buff);
return -1;
}
mayrd2 = true;
}
if (XIO_GETWRFD(sock1) >= 0 && fd1out->fd >= 0 && fd1out->revents) {
if (fd1out->revents & POLLNVAL) {
Error1("poll(...[%d]: invalid request", fd1out->fd);
free(buff);
return -1;
}
maywr1 = true;
}
if (XIO_GETWRFD(sock2) >= 0 && fd2out->fd >= 0 && fd2out->revents) {
if (fd2out->revents & POLLNVAL) {
Error1("poll(...[%d]: invalid request", fd2out->fd);
free(buff);
return -1;
}
maywr2 = true;
}
if (mayrd1 && maywr2) {
mayrd1 = false;
if ((bytes1 = xiotransfer(sock1, sock2, &buff, socat_opts.bufsiz, false))
< 0) {
if (errno != EAGAIN) {
closing = MAX(closing, 1);
Notice("socket 1 to socket 2 is in error");
if (socat_opts.lefttoright) {
break;
}
}
} else if (bytes1 > 0) {
maywr2 = false;
total_timeout = socat_opts.total_timeout;
wasaction = 1;
/* is more data available that has already passed poll()? */
mayrd1 = (xiopending(sock1) > 0);
if (XIO_RDSTREAM(sock1)->readbytes != 0 &&
XIO_RDSTREAM(sock1)->actbytes == 0) {
/* avoid idle when all readbytes already there */
mayrd1 = true;
}
/* escape char occurred? */