forked from xelerance/xl2tpd
-
Notifications
You must be signed in to change notification settings - Fork 0
/
Copy pathxl2tpd.c
1935 lines (1770 loc) · 54.2 KB
/
xl2tpd.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
/*
* Layer Two Tunnelling Protocol Daemon
* Copyright (C) 1998 Adtran, Inc.
* Copyright (C) 2002 Jeff McAdams
*
*
* Mark Spencer
*
* This software is distributed under the terms
* of the GPL, which you should have received
* along with this source.
*
* Main Daemon source.
*
*/
#define _ISOC99_SOURCE
#define _XOPEN_SOURCE
#define _BSD_SOURCE
#define _DEFAULT_SOURCE
#define _XOPEN_SOURCE_EXTENDED 1
#define _GNU_SOURCE
#include <stdlib.h>
#include <sys/types.h>
#include <sys/utsname.h>
#include <sys/stat.h>
#include <sys/wait.h>
#include <stdio.h>
#include <stdarg.h>
#include <errno.h>
#include <unistd.h>
#include <time.h>
#include <signal.h>
#ifndef LINUX
# include <sys/socket.h>
#endif
#include <netdb.h>
#include <string.h>
#include <strings.h>
#include <fcntl.h>
#include <netinet/in.h>
#include <arpa/inet.h>
#include "l2tp.h"
struct tunnel_list tunnels;
int rand_source;
int ppd = 1; /* Packet processing delay */
int control_fd; /* descriptor of control area */
static char *dial_no_tmp; /* jz: Dialnumber for Outgoing Call */
int switch_io = 0; /* jz: Switch for Incoming or Outgoing Call */
static void open_controlfd(void);
static volatile sig_atomic_t sigterm_received;
static volatile sig_atomic_t sigint_received;
static volatile sig_atomic_t sigchld_received;
static volatile sig_atomic_t sigusr1_received;;
static volatile sig_atomic_t sighup_received;
struct control_requests_handler {
char type;
int (*handler) (FILE* resf, char* bufp);
};
static int control_handle_available(FILE* resf, char* bufp);
static int control_handle_lns_add_modify(FILE* resf, char* bufp);
static int control_handle_lns_status(FILE* resf, char* bufp);
static int control_handle_tunnel(FILE* respf, char* bufp);
static int control_handle_lac_connect(FILE* resf, char* bufp);
static int control_handle_lac_outgoing_call(FILE* resf, char* bufp);
static int control_handle_lac_hangup(FILE* resf, char* bufp);
static int control_handle_lac_disconnect(FILE* resf, char* bufp);
static int control_handle_lac_add_modify(FILE* resf, char* bufp);
static int control_handle_lac_remove(FILE* resf, char* bufp);
static int control_handle_lac_status();
static int control_handle_lns_remove(FILE* resf, char* bufp);
static struct control_requests_handler control_handlers[] = {
{CONTROL_PIPE_REQ_AVAILABLE, &control_handle_available},
{CONTROL_PIPE_REQ_LNS_ADD_MODIFY, &control_handle_lns_add_modify},
{CONTROL_PIPE_REQ_LNS_STATUS, &control_handle_lns_status},
{CONTROL_PIPE_REQ_TUNNEL, &control_handle_tunnel},
{CONTROL_PIPE_REQ_LAC_CONNECT, &control_handle_lac_connect},
{CONTROL_PIPE_REQ_LAC_OUTGOING_CALL, &control_handle_lac_outgoing_call},
{CONTROL_PIPE_REQ_LAC_HANGUP, &control_handle_lac_hangup},
{CONTROL_PIPE_REQ_LAC_DISCONNECT, &control_handle_lac_disconnect},
{CONTROL_PIPE_REQ_LAC_ADD_MODIFY, &control_handle_lac_add_modify},
{CONTROL_PIPE_REQ_LAC_REMOVE, &control_handle_lac_remove},
{CONTROL_PIPE_REQ_LAC_STATUS, &control_handle_lac_status},
{CONTROL_PIPE_REQ_LNS_REMOVE, &control_handle_lns_remove},
{0, NULL}
};
static void init_tunnel_list (struct tunnel_list *t)
{
t->head = NULL;
t->count = 0;
t->calls = 0;
}
/* Now sends to syslog instead - MvO */
static void show_status (void)
{
struct schedule_entry *se;
struct tunnel *t;
struct call *c;
struct lns *tlns;
struct lac *tlac;
struct host *h;
unsigned long cnt = 0;
int s = 0;
l2tp_log (LOG_WARNING, "====== xl2tpd statistics ========\n");
l2tp_log (LOG_WARNING, " Scheduler entries:\n");
se = events;
while (se)
{
s++;
t = (struct tunnel *) se->data;
tlac = (struct lac *) se->data;
c = (struct call *) se->data;
if (se->func == &hello)
{
l2tp_log (LOG_WARNING, "%d: HELLO to %d\n", s, t->tid);
}
else if (se->func == &magic_lac_dial)
{
l2tp_log (LOG_WARNING, "%d: Magic dial on %s\n", s, tlac->entname);
}
else if (se->func == &send_zlb)
{
l2tp_log (LOG_WARNING, "%d: Send payload ZLB on call %d:%d\n", s,
c->container->tid, c->cid);
}
else if (se->func == &dethrottle)
{
l2tp_log (LOG_WARNING, "%d: Dethrottle call %d:%d\n", s, c->container->tid,
c->cid);
}
else if (se->func == &control_xmit)
{
l2tp_log (LOG_WARNING, "%d: Control xmit on %d\n", s,((struct buffer *)se->data)->tunnel->tid);
}
else
l2tp_log (LOG_WARNING, "%d: Unknown event\n", s);
se = se->next;
};
l2tp_log (LOG_WARNING, "Total Events scheduled: %d\n", s);
l2tp_log (LOG_WARNING, "Number of tunnels open: %d\n", tunnels.count);
t = tunnels.head;
while (t)
{
l2tp_log (LOG_WARNING, "Tunnel %s, ID = %d (local), %d (remote) to %s:%d,"
" control_seq_num = %d, control_rec_seq_num = %d,"
" cLr = %d, call count = %d ref=%u/refhim=%u",
(t->lac ? t->lac->entname : (t->lns ? t->lns->entname : "")),
t->ourtid, t->tid, IPADDY6 (t->peer.sin6_addr),
ntohs (t->peer.sin6_port), t->control_seq_num,
t->control_rec_seq_num, t->cLr, t->count,
t->refme, t->refhim);
c = t->call_head;
while (c)
{
cnt++;
l2tp_log (LOG_WARNING,
"Call %s # %lu, ID = %d (local), %d (remote), serno = %u,"
" data_seq_num = %d, data_rec_seq_num = %d,"
" pLr = %d, tx = %u bytes (%u), rx= %u bytes (%u)",
(c->lac ? c->lac->
entname : (c->lns ? c->lns->entname : "")),
cnt, c->ourcid,
c->cid, c->serno, c->data_seq_num, c->data_rec_seq_num,
c->pLr, c->tx_bytes, c->tx_pkts, c->rx_bytes, c->rx_pkts);
c = c->next;
}
t = t->next;
}
l2tp_log (LOG_WARNING, "==========Config File===========\n");
tlns = lnslist;
while (tlns)
{
l2tp_log (LOG_WARNING, "LNS entry %s\n",
tlns->entname[0] ? tlns->entname : "(unnamed)");
tlns = tlns->next;
};
tlac = laclist;
while (tlac)
{
l2tp_log (LOG_WARNING, "LAC entry %s, LNS is/are:",
tlac->entname[0] ? tlac->entname : "(unnamed)");
h = tlac->lns;
if (h)
{
while (h)
{
l2tp_log (LOG_WARNING, " %s", h->hostname);
h = h->next;
}
}
else
l2tp_log (LOG_WARNING, " [none]");
tlac = tlac->next;
};
l2tp_log (LOG_WARNING, "================================\n");
}
static void null_handler(int sig)
{
UNUSED(sig);
/* FIXME
* A sighup is received when a call is terminated, unknown origine ..
* I catch it and ll looks good, but ..
*/
}
static void status_handler (int sig)
{
UNUSED(sig);
show_status ();
}
static void child_handler (int sig)
{
UNUSED(sig);
/*
* Oops, somebody we launched was killed.
* It's time to reap them and close that call.
* But first, we have to find out what PID died.
* unfortunately, pppd will
*/
struct tunnel *t;
struct call *c;
pid_t pid;
int status;
/* Keep looping until all are cleared */
for(;;)
{
pid = waitpid (-1, &status, WNOHANG);
if (pid < 1)
{
/*
* Oh well, nobody there. Maybe we reaped it
* somewhere else already
*/
return;
}
/* find the call that "owned" the pppd which just died */
t = tunnels.head;
while (t)
{
c = t->call_head;
t = t->next;
while (c)
{
if (c->pppd == pid)
{
if ( WIFEXITED( status ) )
{
l2tp_log (LOG_DEBUG, "%s : pppd exited for call %d with code %d\n", __FUNCTION__,
c->cid, WEXITSTATUS( status ) );
}
else if( WIFSIGNALED( status ) )
{
l2tp_log (LOG_DEBUG, "%s : pppd terminated for call %d by signal %d\n", __FUNCTION__,
c->cid, WTERMSIG( status ) );
}
else
{
l2tp_log (LOG_DEBUG, "%s : pppd exited for call %d for unknown reason\n", __FUNCTION__,
c->cid );
}
c->needclose = -1;
/*
* OK...pppd died, we can go ahead and close the pty for
* it
*/
#ifdef USE_KERNEL
if (!kernel_support) {
#endif
close (c->fd);
#ifdef USE_KERNEL
}
#endif
c->fd = -1;
/*
* terminate tunnel and call loops, returning to the
* for(;;) loop (and possibly get the next pid)
*/
t = NULL;
break;
}
c = c->next;
}
}
}
}
static void death_handler (int signal)
{
/*
* If we get here, somebody terminated us with a kill or a control-c.
* we call call_close on each tunnel twice to get a StopCCN out
* for each one (we can't pause to make sure it's received.
* Then we close the connections
*/
struct tunnel *st, *st2;
int sec;
l2tp_log (LOG_CRIT, "%s: Fatal signal %d received\n", __FUNCTION__, signal);
#ifdef USE_KERNEL
if (kernel_support || signal != SIGTERM) {
#else
if (signal != SIGTERM) {
#endif
st = tunnels.head;
while (st)
{
st2 = st->next;
strcpy (st->self->errormsg, "Server closing");
sec = st->self->closing;
if (st->lac)
st->lac->redial = 0;
call_close (st->self);
if (!sec)
{
st->self->closing = -1;
call_close (st->self);
}
st = st2;
}
}
/* erase pid and control files */
unlink (gconfig.pidfile);
unlink (gconfig.controlfile);
free(dial_no_tmp);
close(server_socket);
close(control_fd);
closelog();
exit (1);
}
static void sigterm_handler(int sig)
{
UNUSED(sig);
sigterm_received = 1;
}
static void sigint_handler(int sig)
{
UNUSED(sig);
sigint_received = 1;
}
static void sigchld_handler(int sig)
{
UNUSED(sig);
sigchld_received = 1;
}
static void sigusr1_handler(int sig)
{
UNUSED(sig);
sigusr1_received = 1;
}
static void sighup_handler(int sig)
{
UNUSED(sig);
sighup_received = 1;
}
void process_signal(void)
{
if (sigterm_received) { sigterm_received = 0; death_handler(SIGTERM); }
if (sigint_received) { sigint_received = 0; death_handler(SIGINT); }
if (sigchld_received) { sigchld_received = 0; child_handler(SIGCHLD); }
if (sigusr1_received) { sigusr1_received = 0; status_handler(SIGUSR1); }
if (sighup_received) { sighup_received = 0; null_handler(SIGHUP); }
}
int start_pppd (struct call *c, struct ppp_opts *opts)
{
/* char a, b; */
char tty[512];
char *stropt[80];
#ifdef USE_KERNEL
struct sockaddr_pppol2tpin6 sax;
int flags;
#endif
int pos = 1;
int fd2 = -1;
#ifdef DEBUG_PPPD
int x;
#endif
struct termios ptyconf;
struct call *sc;
struct tunnel *st;
stropt[0] = strdup (PPPD);
if (c->pppd > 0)
{
l2tp_log(LOG_WARNING, "%s: PPP already started on call!\n", __FUNCTION__);
return -EINVAL;
}
if (c->fd > -1)
{
l2tp_log (LOG_WARNING, "%s: file descriptor already assigned!\n",
__FUNCTION__);
return -EINVAL;
}
#ifdef USE_KERNEL
if (kernel_support)
{
fd2 = socket(AF_PPPOX, SOCK_DGRAM, PX_PROTO_OL2TP);
if (fd2 < 0) {
l2tp_log (LOG_WARNING, "%s: Unable to allocate PPPoL2TP socket.\n",
__FUNCTION__);
return -EINVAL;
}
flags = fcntl(fd2, F_GETFL);
if (flags == -1 || fcntl(fd2, F_SETFL, flags | O_NONBLOCK) == -1) {
l2tp_log (LOG_WARNING, "%s: Unable to set PPPoL2TP socket nonblock.\n",
__FUNCTION__);
return -EINVAL;
}
memset(&sax, 0, sizeof(sax));
sax.sa_family = AF_PPPOX;
sax.sa_protocol = PX_PROTO_OL2TP;
sax.pppol2tp.fd = c->container->udp_fd;
//memcpy(sax.pppol2tp.addr.sin6_addr.s6_addr, c->container->peer.sin6_addr.s6_addr, sizeof(*(c->container->peer.sin6_addr.s6_addr)) * 16);
//sax.pppol2tp.addr.sin6_addr.s6_addr = c->container->peer.sin6_addr.s6_addr;
sax.pppol2tp.addr.sin6_addr = c->container->peer.sin6_addr;
sax.pppol2tp.addr.sin6_port = c->container->peer.sin6_port;
sax.pppol2tp.addr.sin6_family = AF_INET6;
sax.pppol2tp.s_tunnel = c->container->ourtid;
sax.pppol2tp.s_session = c->ourcid;
sax.pppol2tp.d_tunnel = c->container->tid;
sax.pppol2tp.d_session = c->cid;
if (connect(fd2, (struct sockaddr *)&sax, sizeof(sax)) < 0) {
l2tp_log (LOG_WARNING, "%s: Unable to connect PPPoL2TP socket.\n",
__FUNCTION__);
close(fd2);
return -EINVAL;
}
stropt[pos++] = strdup ("plugin");
stropt[pos++] = strdup ("pppol2tp.so");
stropt[pos++] = strdup ("pppol2tp");
stropt[pos] = malloc (11);
snprintf (stropt[pos], 11, "%d", fd2);
pos++;
if (c->container->lns) {
stropt[pos++] = strdup ("pppol2tp_lns_mode");
stropt[pos++] = strdup ("pppol2tp_tunnel_id");
stropt[pos] = malloc (11);
snprintf (stropt[pos], 11, "%d", c->container->ourtid);
pos++;
stropt[pos++] = strdup ("pppol2tp_session_id");
stropt[pos] = malloc (11);
snprintf (stropt[pos], 11, "%d", c->ourcid);
pos++;
}
}
else
#endif
{
if ((c->fd = getPtyMaster (tty, sizeof(tty))) < 0)
{
l2tp_log (LOG_WARNING, "%s: unable to allocate pty, abandoning!\n",
__FUNCTION__);
return -EINVAL;
}
/* set fd opened above to not echo so we don't see read our own packets
back of the file descriptor that we just wrote them to */
tcgetattr (c->fd, &ptyconf);
*(c->oldptyconf) = ptyconf;
ptyconf.c_cflag &= ~(ICANON | ECHO);
ptyconf.c_lflag &= ~ECHO;
tcsetattr (c->fd, TCSANOW, &ptyconf);
if(fcntl(c->fd, F_SETFL, O_NONBLOCK)!=0) {
l2tp_log(LOG_WARNING, "failed to set nonblock: %s\n", strerror(errno));
return -EINVAL;
}
fd2 = open (tty, O_RDWR);
if (fd2 < 0) {
l2tp_log (LOG_WARNING, "unable to open tty %s, cannot start pppd", tty);
return -EINVAL;
}
stropt[pos++] = strdup(tty);
}
{
struct ppp_opts *p = opts;
int maxn_opts = sizeof(stropt) / sizeof(stropt[0]) - 1;
while (p && pos < maxn_opts)
{
stropt[pos] = strdup (p->option);
pos++;
p = p->next;
}
stropt[pos] = NULL;
}
#ifdef DEBUG_PPPD
l2tp_log (LOG_DEBUG, "%s: I'm running: \n", __FUNCTION__);
for (x = 0; stropt[x]; x++)
{
l2tp_log (LOG_DEBUG, "\"%s\" \n", stropt[x]);
};
#endif
#ifdef __uClinux__
c->pppd = vfork ();
#else
c->pppd = fork ();
#endif
if (c->pppd < 0)
{
/* parent */
l2tp_log(LOG_WARNING,"%s: unable to fork(), abandoning!\n", __FUNCTION__);
close(fd2);
return -EINVAL;
}
else if (!c->pppd)
{
/* child */
close (0); /* redundant; the dup2() below would do that, too */
close (1); /* ditto */
/* close (2); No, we want to keep the connection to /dev/null. */
#ifdef USE_KERNEL
if (!kernel_support)
#endif
{
/* connect the pty to stdin and stdout */
dup2 (fd2, 0);
dup2 (fd2, 1);
close(fd2);
}
/* close all the calls pty fds */
st = tunnels.head;
while (st)
{
#ifdef USE_KERNEL
if (kernel_support) {
if(st->udp_fd!=-1)
close(st->udp_fd); /* tunnel UDP fd */
if(st->pppox_fd!=-1)
close(st->pppox_fd); /* tunnel PPPoX fd */
} else
#endif
{
sc = st->call_head;
while (sc)
{
if(sc->fd!=-1)
close (sc->fd); /* call pty fd */
sc = sc->next;
}
}
st = st->next;
}
/* close the UDP socket fd */
if(server_socket!=-1)
close (server_socket);
/* close the control pipe fd */
if(control_fd!=-1)
close (control_fd);
if( c->dialing[0] )
{
setenv( "CALLER_ID", c->dialing, 1 );
}
execv (PPPD, stropt);
l2tp_log (LOG_WARNING, "%s: Exec of %s failed!\n", __FUNCTION__, PPPD);
_exit (1);
}
close (fd2);
pos = 0;
while (stropt[pos])
{
free (stropt[pos]);
pos++;
};
return 0;
}
void destroy_tunnel (struct tunnel *t)
{
/*
* Immediately destroy a tunnel (and all its calls)
* and free its resources. This may be called
* by the tunnel itself,so it needs to be
* "suicide safe"
*/
struct call *c, *me, *next;
struct tunnel *p;
struct timeval tv;
if (!t)
return;
/*
* Save ourselves until the very
* end, since we might be calling this ourselves.
* We must divorce ourself from the tunnel
* structure, however, to avoid recursion
* because of the logic of the destroy_call
*/
me = t->self;
/*
* Destroy all the member calls
*/
c = t->call_head;
while (c)
{
next = c->next;
destroy_call (c);
c = next;
};
/*
* Remove ourselves from the list of tunnels
*/
if (tunnels.head == t)
{
tunnels.head = t->next;
tunnels.count--;
}
else
{
p = tunnels.head;
if (p)
{
while (p->next && (p->next != t))
p = p->next;
if (p->next)
{
p->next = t->next;
tunnels.count--;
}
else
{
l2tp_log (LOG_WARNING,
"%s: unable to locate tunnel in tunnel list\n",
__FUNCTION__);
}
}
else
{
l2tp_log (LOG_WARNING, "%s: tunnel list is empty!\n", __FUNCTION__);
}
}
if (t->lac)
{
t->lac->t = NULL;
if (t->lac->redial && (t->lac->rtimeout > 0) && !t->lac->rsched &&
t->lac->active)
{
l2tp_log (LOG_INFO, "Will redial in %d seconds\n",
t->lac->rtimeout);
tv.tv_sec = t->lac->rtimeout;
tv.tv_usec = 0;
t->lac->rsched = schedule (tv, magic_lac_dial, t->lac);
}
}
/* XXX L2TP/IPSec: remove relevant SAs here? NTB 20011010
* XXX But what if another tunnel is using same SA?
*/
if (t->lns)
t->lns->t = NULL;
if (t->chal_us.challenge)
free (t->chal_us.challenge);
if (t->chal_them.challenge)
free (t->chal_them.challenge);
/* we need no free(t->chal_us.vector) here because we malloc() and free()
the memory pointed to by t->chal_us.vector at some other place */
if (t->chal_them.vector)
free (t->chal_them.vector);
if (t->pppox_fd > -1 )
close (t->pppox_fd);
if (t->udp_fd > -1 )
close (t->udp_fd);
destroy_call (me);
free (t);
}
static struct tunnel *l2tp_call (char *host, int port, struct lac *lac,
struct lns *lns)
{
/*
* Establish a tunnel from us to host
* on port port
*/
struct call *tmp = NULL;
struct in6_addr addr;
int rv;
struct addrinfo hints, *si;
port = htons (port);
memset(&hints, 0, sizeof(hints));
hints.ai_family = AF_INET6;
hints.ai_flags = AI_V4MAPPED;
if ((rv = getaddrinfo(host, NULL, &hints, &si)) != 0)
{
l2tp_log (LOG_WARNING, "Host name lookup failed for %s: %s.\n",
host, gai_strerror(rv));
return NULL;
}
addr = ((struct sockaddr_in6 *)si->ai_addr)->sin6_addr;
/* Force creation of a new tunnel
and set it's tid to 0 to cause
negotiation to occur */
/*
* to do IPsec properly here, we need to set a socket policy,
* and/or communicate with pluto.
*/
tmp = get_call (0, 0, addr, port, IPSEC_SAREF_NULL, IPSEC_SAREF_NULL);
if (!tmp)
{
l2tp_log (LOG_WARNING, "%s: Unable to create tunnel to %s.\n", __FUNCTION__,
host);
return NULL;
}
tmp->container->tid = 0;
tmp->container->lac = lac;
tmp->container->lns = lns;
tmp->lac = lac;
tmp->lns = lns;
if (lac)
lac->t = tmp->container;
if (lns)
lns->t = tmp->container;
/*
* Since our state is 0, we will establish a tunnel now
*/
l2tp_log (LOG_NOTICE, "Connecting to host %s, port %d\n", host,
ntohs (port));
control_finish (tmp->container, tmp);
return tmp->container;
}
static void magic_lac_tunnel (void *data)
{
struct lac *lac;
lac = (struct lac *) data;
if (!lac)
{
l2tp_log (LOG_WARNING, "%s: magic_lac_tunnel: called on NULL lac!\n",
__FUNCTION__);
return;
}
if (lac->lns)
{
/* FIXME: I should try different LNS's if I get failures */
l2tp_call (lac->lns->hostname, lac->lns->port, lac, NULL);
}
else if (deflac && deflac->lns)
{
l2tp_call (deflac->lns->hostname, deflac->lns->port, lac, NULL);
}
else
{
l2tp_log (LOG_WARNING, "%s: Unable to find hostname to dial for '%s'\n",
__FUNCTION__, lac->entname);
}
}
static struct call *lac_call (int tid, struct lac *lac, struct lns *lns)
{
struct tunnel *t = tunnels.head;
struct call *tmp;
while (t)
{
if (t->ourtid == tid)
{
tmp = new_call (t);
if (!tmp)
{
l2tp_log (LOG_WARNING, "%s: unable to create new call\n",
__FUNCTION__);
return NULL;
}
tmp->next = t->call_head;
t->call_head = tmp;
t->count++;
tmp->cid = 0;
tmp->lac = lac;
tmp->lns = lns;
if (lac)
lac->c = tmp;
l2tp_log (LOG_NOTICE, "Calling on tunnel %d\n", tid);
strcpy (tmp->dial_no, dial_no_tmp); /* jz: copy dialnumber to tmp->dial_no */
control_finish (t, tmp);
return tmp;
}
t = t->next;
};
l2tp_log (LOG_DEBUG, "%s: No such tunnel %d to generate call.\n", __FUNCTION__,
tid);
return NULL;
}
void magic_lac_dial (void *data)
{
struct lac *lac;
lac = (struct lac *) data;
if (!lac)
{
l2tp_log (LOG_WARNING, "%s : called on NULL lac!\n", __FUNCTION__);
return;
}
if (!lac->active)
{
l2tp_log (LOG_DEBUG, "%s: LAC %s not active", __FUNCTION__, lac->entname);
return;
}
lac->rsched = NULL;
lac->rtries++;
if (lac->rmax && (lac->rtries > lac->rmax))
{
l2tp_log (LOG_INFO, "%s: maximum retries exceeded.\n", __FUNCTION__);
return;
}
if (!lac->t)
{
#ifdef DEGUG_MAGIC
l2tp_log (LOG_DEBUG, "%s : tunnel not up! Connecting!\n", __FUNCTION__);
#endif
magic_lac_tunnel (lac);
return;
}
lac_call (lac->t->ourtid, lac, NULL);
}
static void lac_hangup (int cid)
{
struct tunnel *t = tunnels.head;
struct call *tmp;
while (t)
{
tmp = t->call_head;
while (tmp)
{
if (tmp->ourcid == cid)
{
l2tp_log (LOG_INFO,
"%s :Hanging up call %d, Local: %d, Remote: %d\n",
__FUNCTION__, tmp->serno, tmp->ourcid, tmp->cid);
strcpy (tmp->errormsg, "Goodbye!");
/* tmp->needclose = -1; */
kill (tmp->pppd, SIGTERM);
return;
}
tmp = tmp->next;
}
t = t->next;
};
l2tp_log (LOG_DEBUG, "%s : No such call %d to hang up.\n", __FUNCTION__, cid);
return;
}
static void lac_disconnect (int tid)
{
struct tunnel *t = tunnels.head;
while (t)
{
if (t->ourtid == tid)
{
l2tp_log (LOG_INFO,
"Disconnecting from %s, Local: %d, Remote: %d\n",
IPADDY6 (t->peer.sin6_addr), t->ourtid, t->tid);
t->self->needclose = -1;
strcpy (t->self->errormsg, "Goodbye!");
call_close (t->self);
return;
}
t = t->next;
};
l2tp_log (LOG_DEBUG, "No such tunnel %d to hang up.\n", tid);
return;
}
struct tunnel *new_tunnel ()
{
struct tunnel *tmp = calloc (1, sizeof (struct tunnel));
unsigned char entropy_buf[2] = "\0";
if (!tmp)
return NULL;
tmp->debug = -1;
tmp->tid = -1;
#ifndef TESTING
/* while(get_call((tmp->ourtid = rand() & 0xFFFF),0,0,0)); */
/* tmp->ourtid = rand () & 0xFFFF; */
/* get_entropy((char *)&tmp->ourtid, 2); */
get_entropy(entropy_buf, 2);
{
unsigned short *temp;
temp = (unsigned short *)entropy_buf;
tmp->ourtid = *temp & 0xFFFF;
#ifdef DEBUG_ENTROPY
l2tp_log(LOG_DEBUG, "ourtid = %u, entropy_buf = %hx\n", tmp->ourtid, *temp);
#endif
}
#else
tmp->ourtid = 0x6227;
#endif
tmp->peer.sin6_family = AF_INET6;
bzero (&(tmp->peer.sin6_addr), sizeof (tmp->peer.sin6_addr));
#ifdef SANITY
tmp->sanity = -1;
#endif
tmp->qtid = -1;
tmp->ourfc = ASYNC_FRAMING | SYNC_FRAMING;
tmp->ourtb = (((_u64) rand ()) << 32) | ((_u64) rand ());
tmp->fc = -1; /* These really need to be specified by the peer */
tmp->bc = -1; /* And we want to know if they forgot */
if (!(tmp->self = new_call (tmp)))
{
free (tmp);
return NULL;
};
tmp->ourrws = DEFAULT_RWS_SIZE;
tmp->self->ourfbit = FBIT;
tmp->rxspeed = DEFAULT_RX_BPS;
tmp->txspeed = DEFAULT_TX_BPS;
memset (tmp->chal_us.reply, 0, MD_SIG_SIZE);
memset (tmp->chal_them.reply, 0, MD_SIG_SIZE);
tmp->chal_them.vector = malloc (VECTOR_SIZE);
return tmp;
}
static void write_res (FILE* res_file, const char *fmt, ...)
{
if (!res_file || ferror (res_file) || feof (res_file))
return;
va_list args;
va_start (args, fmt);
vfprintf (res_file, fmt, args);
va_end (args);
}
static int parse_one_line (char* bufp, int context, void* tc)
{
/* FIXME: I should check for incompatible options */
char *s, *d, *t;
int linenum = 0;
s = strtok (bufp, ";");
// parse options token by token
while (s != NULL)
{
linenum++;
while ((*s < 33) && *s)
s++; /* Skip over beginning white space */
t = s + strlen (s);
while ((t >= s) && (*t < 33))
*(t--) = 0; /* Ditch trailing white space */
if (!strlen (s))
continue;
if (!(t = strchr (s, '=')))
{
l2tp_log (LOG_WARNING, "%s: token %d: no '=' in data\n",
__FUNCTION__, linenum);
return -1;
}
d = t;
d--;
t++;
while ((d >= s) && (*d < 33))
d--;
d++;
*d = 0;
while (*t && (*t < 33))
t++;
#ifdef DEBUG_CONTROL
l2tp_log (LOG_DEBUG, "%s: field is %s, value is %s\n",
__FUNCTION__, s, t);
#endif
/* Okay, bit twidling is done. Let's handle this */
switch (parse_one_option (s, t, context, tc))
{
case -1:
l2tp_log (LOG_WARNING, "%s: error token %d\n",
__FUNCTION__, linenum);