-
Notifications
You must be signed in to change notification settings - Fork 314
/
Copy pathserver.c
1876 lines (1496 loc) · 55.5 KB
/
server.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
//
// This file is part of Dire Wolf, an amateur radio packet TNC.
//
// Copyright (C) 2011, 2012, 2013, 2014, 2015, 2016 John Langner, WB2OSZ
//
// This program is free software: you can redistribute it and/or modify
// it under the terms of the GNU General Public License as published by
// the Free Software Foundation, either version 2 of the License, or
// (at your option) any later version.
//
// This program is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
// GNU General Public License for more details.
//
// You should have received a copy of the GNU General Public License
// along with this program. If not, see <http://www.gnu.org/licenses/>.
//
/*------------------------------------------------------------------
*
* Module: server.c
*
* Purpose: Provide service to other applications via "AGW TCPIP Socket Interface".
*
* Input:
*
* Outputs:
*
* Description: This provides a TCP socket for communication with a client application.
* It implements a subset of the AGW socket interface.
*
* Commands from application recognized:
*
* 'R' Request for version number.
* (See below for response.)
*
* 'G' Ask about radio ports.
* (See below for response.)
*
* 'g' Capabilities of a port. (new in 0.8)
* (See below for response.)
*
* 'k' Ask to start receiving RAW AX25 frames.
*
* 'm' Ask to start receiving Monitor AX25 frames.
*
* 'V' Transmit UI data frame.
* Generate audio for transmission.
*
* 'H' Report recently heard stations. Not implemented yet.
*
* 'K' Transmit raw AX.25 frame.
*
* 'X' Register CallSign
*
* 'x' Unregister CallSign
*
* 'y' Ask Outstanding frames waiting on a Port (new in 1.2)
*
* 'C' Connect, Start an AX.25 Connection (new in 1.4)
*
* 'v' Connect VIA, Start an AX.25 circuit thru digipeaters (new in 1.4)
*
* 'c' Connection with non-standard PID (new in 1.4)
*
* 'D' Send Connected Data (new in 1.4)
*
* 'd' Disconnect, Terminate an AX.25 Connection (new in 1.4)
*
*
* A message is printed if any others are received.
*
* TODO: Should others be implemented?
*
*
* Messages sent to client application:
*
* 'R' Reply to Request for version number.
* Currently responds with major 1, minor 0.
*
* 'G' Reply to Ask about radio ports.
*
* 'g' Reply to capabilities of a port. (new in 0.8)
*
* 'K' Received AX.25 frame in raw format.
* (Enabled with 'k' command.)
*
* 'U' Received AX.25 frame in monitor format.
* (Enabled with 'm' command.)
*
* 'y' Outstanding frames waiting on a Port (new in 1.2)
*
* 'C' AX.25 Connection Received (new in 1.4)
*
* 'D' Connected AX.25 Data (new in 1.4)
*
* 'd' Disconnected (new in 1.4)
*
*
*
* References: AGWPE TCP/IP API Tutorial
* http://uz7ho.org.ua/includes/agwpeapi.htm
*
* Getting Started with Winsock
* http://msdn.microsoft.com/en-us/library/windows/desktop/bb530742(v=vs.85).aspx
*
*
* Major change in 1.1:
*
* Formerly a single client was allowed.
* Now we can have multiple concurrent clients.
*
*---------------------------------------------------------------*/
/*
* Native Windows: Use the Winsock interface.
* Linux: Use the BSD socket interface.
* Cygwin: Can use either one.
*/
#include "direwolf.h" // Sets _WIN32_WINNT for XP API level needed by ws2tcpip.h
#if __WIN32__
#include <winsock2.h>
#include <ws2tcpip.h> // _WIN32_WINNT must be set to 0x0501 before including this
#else
#include <stdlib.h>
#include <sys/types.h>
#include <sys/ioctl.h>
#include <sys/socket.h>
#include <netinet/in.h>
#ifdef __OpenBSD__
#include <errno.h>
#else
#include <sys/errno.h>
#endif
#endif
#include <unistd.h>
#include <stdio.h>
#include <assert.h>
#include <string.h>
#include <time.h>
#include <ctype.h>
#include "tq.h"
#include "ax25_pad.h"
#include "textcolor.h"
#include "audio.h"
#include "server.h"
#include "dlq.h"
/*
* Previously, we allowed only one network connection at a time to each port.
* In version 1.1, we allow multiple concurrent client apps to connect.
*/
#define MAX_NET_CLIENTS 3
static int client_sock[MAX_NET_CLIENTS];
/* File descriptor for socket for */
/* communication with client application. */
/* Set to -1 if not connected. */
/* (Don't use SOCKET type because it is unsigned.) */
static int enable_send_raw_to_client[MAX_NET_CLIENTS];
/* Should we send received packets to client app in raw form? */
/* Note that it starts as false for a new connection. */
/* the client app must send a command to enable this. */
static int enable_send_monitor_to_client[MAX_NET_CLIENTS];
/* Should we send received packets to client app in monitor form? */
/* Note that it starts as false for a new connection. */
/* the client app must send a command to enable this. */
// TODO: define in one place, use everywhere.
// TODO: Macro to terminate thread when no point to go on.
#if __WIN32__
#define THREAD_F unsigned __stdcall
#else
#define THREAD_F void *
#endif
static THREAD_F connect_listen_thread (void *arg);
static THREAD_F cmd_listen_thread (void *arg);
/*
* Message header for AGW protocol.
* Multibyte numeric values require rearranging for big endian cpu.
*/
/*
* With MinGW version 4.6, obviously x86.
* or Linux gcc version 4.9, Linux ARM.
*
* $ gcc -E -dM - < /dev/null | grep END
* #define __ORDER_LITTLE_ENDIAN__ 1234
* #define __FLOAT_WORD_ORDER__ __ORDER_LITTLE_ENDIAN__
* #define __ORDER_PDP_ENDIAN__ 3412
* #define __ORDER_BIG_ENDIAN__ 4321
* #define __BYTE_ORDER__ __ORDER_LITTLE_ENDIAN__
*
* This is for standard OpenWRT on MIPS.
*
* #define __ORDER_LITTLE_ENDIAN__ 1234
* #define __FLOAT_WORD_ORDER__ __ORDER_BIG_ENDIAN__
* #define __ORDER_PDP_ENDIAN__ 3412
* #define __ORDER_BIG_ENDIAN__ 4321
* #define __BYTE_ORDER__ __ORDER_BIG_ENDIAN__
*
* This was reported for an old Mac with PowerPC processor.
* (Newer versions have x86.)
*
* $ gcc -E -dM - < /dev/null | grep END
* #define __BIG_ENDIAN__ 1
* #define _BIG_ENDIAN 1
*/
#if defined(__BIG_ENDIAN__) || (defined(__BYTE_ORDER__) && defined(__ORDER_BIG_ENDIAN__) && __BYTE_ORDER__ == __ORDER_BIG_ENDIAN__)
// gcc >= 4.2 has __builtin_swap32() but be compatible with older versions.
#define host2netle(x) ( (((x)>>24)&0x000000ff) | (((x)>>8)&0x0000ff00) | (((x)<<8)&0x00ff0000) | (((x)<<24)&0xff000000) )
#define netle2host(x) ( (((x)>>24)&0x000000ff) | (((x)>>8)&0x0000ff00) | (((x)<<8)&0x00ff0000) | (((x)<<24)&0xff000000) )
#else
#define host2netle(x) (x)
#define netle2host(x) (x)
#endif
struct agwpe_s {
unsigned char portx; /* 0 for first, 1 for second, etc. */
unsigned char reserved1;
unsigned char reserved2;
unsigned char reserved3;
unsigned char datakind; /* message type, usually written as a letter. */
unsigned char reserved4;
unsigned char pid;
unsigned char reserved5;
char call_from[10];
char call_to[10];
int data_len_NETLE; /* Number of data bytes following. */
/* _NETLE suffix is reminder to convert for network byte order. */
int user_reserved_NETLE;
};
static void send_to_client (int client, void *reply_p);
/*-------------------------------------------------------------------
*
* Name: debug_print
*
* Purpose: Print message to/from client for debugging.
*
* Inputs: fromto - Direction of message.
* client - client number, 0 .. MAX_NET_CLIENTS-1
* pmsg - Address of the message block.
* msg_len - Length of the message.
*
*--------------------------------------------------------------------*/
static int debug_client = 0; /* Debug option: Print information flowing from and to client. */
void server_set_debug (int n)
{
debug_client = n;
}
void hex_dump (unsigned char *p, int len)
{
int n, i, offset;
offset = 0;
while (len > 0) {
n = len < 16 ? len : 16;
dw_printf (" %03x: ", offset);
for (i=0; i<n; i++) {
dw_printf (" %02x", p[i]);
}
for (i=n; i<16; i++) {
dw_printf (" ");
}
dw_printf (" ");
for (i=0; i<n; i++) {
dw_printf ("%c", isprint(p[i]) ? p[i] : '.');
}
dw_printf ("\n");
p += 16;
offset += 16;
len -= 16;
}
}
typedef enum fromto_e { FROM_CLIENT=0, TO_CLIENT=1 } fromto_t;
static void debug_print (fromto_t fromto, int client, struct agwpe_s *pmsg, int msg_len)
{
char direction [10];
char datakind[80];
const char *prefix [2] = { "<<<", ">>>" };
switch (fromto) {
case FROM_CLIENT:
strlcpy (direction, "from", sizeof(direction)); /* from the client application */
switch (pmsg->datakind) {
case 'P': strlcpy (datakind, "Application Login", sizeof(datakind)); break;
case 'X': strlcpy (datakind, "Register CallSign", sizeof(datakind)); break;
case 'x': strlcpy (datakind, "Unregister CallSign", sizeof(datakind)); break;
case 'G': strlcpy (datakind, "Ask Port Information", sizeof(datakind)); break;
case 'm': strlcpy (datakind, "Enable Reception of Monitoring Frames", sizeof(datakind)); break;
case 'R': strlcpy (datakind, "AGWPE Version Info", sizeof(datakind)); break;
case 'g': strlcpy (datakind, "Ask Port Capabilities", sizeof(datakind)); break;
case 'H': strlcpy (datakind, "Callsign Heard on a Port", sizeof(datakind)); break;
case 'y': strlcpy (datakind, "Ask Outstanding frames waiting on a Port", sizeof(datakind)); break;
case 'Y': strlcpy (datakind, "Ask Outstanding frames waiting for a connection", sizeof(datakind)); break;
case 'M': strlcpy (datakind, "Send UNPROTO Information", sizeof(datakind)); break;
case 'C': strlcpy (datakind, "Connect, Start an AX.25 Connection", sizeof(datakind)); break;
case 'D': strlcpy (datakind, "Send Connected Data", sizeof(datakind)); break;
case 'd': strlcpy (datakind, "Disconnect, Terminate an AX.25 Connection", sizeof(datakind)); break;
case 'v': strlcpy (datakind, "Connect VIA, Start an AX.25 circuit thru digipeaters", sizeof(datakind)); break;
case 'V': strlcpy (datakind, "Send UNPROTO VIA", sizeof(datakind)); break;
case 'c': strlcpy (datakind, "Non-Standard Connections, Connection with PID", sizeof(datakind)); break;
case 'K': strlcpy (datakind, "Send data in raw AX.25 format", sizeof(datakind)); break;
case 'k': strlcpy (datakind, "Activate reception of Frames in raw format", sizeof(datakind)); break;
default: strlcpy (datakind, "**INVALID**", sizeof(datakind)); break;
}
break;
case TO_CLIENT:
default:
strlcpy (direction, "to", sizeof(direction)); /* sent to the client application. */
switch (pmsg->datakind) {
case 'R': strlcpy (datakind, "Version Number", sizeof(datakind)); break;
case 'X': strlcpy (datakind, "Callsign Registration", sizeof(datakind)); break;
case 'G': strlcpy (datakind, "Port Information", sizeof(datakind)); break;
case 'g': strlcpy (datakind, "Capabilities of a Port", sizeof(datakind)); break;
case 'y': strlcpy (datakind, "Frames Outstanding on a Port", sizeof(datakind)); break;
case 'Y': strlcpy (datakind, "Frames Outstanding on a Connection", sizeof(datakind)); break;
case 'H': strlcpy (datakind, "Heard Stations on a Port", sizeof(datakind)); break;
case 'C': strlcpy (datakind, "AX.25 Connection Received", sizeof(datakind)); break;
case 'D': strlcpy (datakind, "Connected AX.25 Data", sizeof(datakind)); break;
case 'd': strlcpy (datakind, "Disconnected", sizeof(datakind)); break;
case 'M': strlcpy (datakind, "Monitored Connected Information", sizeof(datakind)); break;
case 'S': strlcpy (datakind, "Monitored Supervisory Information", sizeof(datakind)); break;
case 'U': strlcpy (datakind, "Monitored Unproto Information", sizeof(datakind)); break;
case 'T': strlcpy (datakind, "Monitoring Own Information", sizeof(datakind)); break;
case 'K': strlcpy (datakind, "Monitored Information in Raw Format", sizeof(datakind)); break;
default: strlcpy (datakind, "**INVALID**", sizeof(datakind)); break;
}
}
text_color_set(DW_COLOR_DEBUG);
dw_printf ("\n");
dw_printf ("%s %s %s AGWPE client application %d, total length = %d\n",
prefix[(int)fromto], datakind, direction, client, msg_len);
dw_printf ("\tportx = %d, datakind = '%c', pid = 0x%02x\n", pmsg->portx, pmsg->datakind, pmsg->pid);
dw_printf ("\tcall_from = \"%s\", call_to = \"%s\"\n", pmsg->call_from, pmsg->call_to);
dw_printf ("\tdata_len = %d, user_reserved = %d, data =\n", netle2host(pmsg->data_len_NETLE), netle2host(pmsg->user_reserved_NETLE));
hex_dump ((unsigned char*)pmsg + sizeof(struct agwpe_s), netle2host(pmsg->data_len_NETLE));
if (msg_len < 36) {
text_color_set (DW_COLOR_ERROR);
dw_printf ("AGWPE message length, %d, is shorter than minumum 36.\n", msg_len);
}
if (msg_len != netle2host(pmsg->data_len_NETLE) + 36) {
text_color_set (DW_COLOR_ERROR);
dw_printf ("AGWPE message length, %d, inconsistent with data length %d.\n", msg_len, netle2host(pmsg->data_len_NETLE));
}
}
/*-------------------------------------------------------------------
*
* Name: server_init
*
* Purpose: Set up a server to listen for connection requests from
* an application such as Xastir.
*
* Inputs: mc->agwpe_port - TCP port for server.
* Main program has default of 8000 but allows
* an alternative to be specified on the command line
*
* 0 means disable. New in version 1.2.
*
* Outputs:
*
* Description: This starts at least two threads:
* * one to listen for a connection from client app.
* * one or more to listen for commands from client app.
* so the main application doesn't block while we wait for these.
*
*--------------------------------------------------------------------*/
static struct audio_s *save_audio_config_p;
void server_init (struct audio_s *audio_config_p, struct misc_config_s *mc)
{
int client;
#if __WIN32__
HANDLE connect_listen_th;
HANDLE cmd_listen_th[MAX_NET_CLIENTS];
#else
pthread_t connect_listen_tid;
pthread_t cmd_listen_tid[MAX_NET_CLIENTS];
int e;
#endif
int server_port = mc->agwpe_port; /* Usually 8000 but can be changed. */
#if DEBUG
text_color_set(DW_COLOR_DEBUG);
dw_printf ("server_init ( %d )\n", server_port);
debug_a = 1;
#endif
save_audio_config_p = audio_config_p;
for (client=0; client<MAX_NET_CLIENTS; client++) {
client_sock[client] = -1;
enable_send_raw_to_client[client] = 0;
enable_send_monitor_to_client[client] = 0;
}
if (server_port == 0) {
text_color_set(DW_COLOR_INFO);
dw_printf ("Disabled AGW network client port.\n");
return;
}
/*
* This waits for a client to connect and sets an available client_sock[n].
*/
#if __WIN32__
connect_listen_th = (HANDLE)_beginthreadex (NULL, 0, connect_listen_thread, (void *)(unsigned int)server_port, 0, NULL);
if (connect_listen_th == NULL) {
text_color_set(DW_COLOR_ERROR);
dw_printf ("Could not create AGW connect listening thread\n");
return;
}
#else
e = pthread_create (&connect_listen_tid, NULL, connect_listen_thread, (void *)(long)server_port);
if (e != 0) {
text_color_set(DW_COLOR_ERROR);
perror("Could not create AGW connect listening thread");
return;
}
#endif
/*
* These read messages from client when client_sock[n] is valid.
* Currently we start up a separate thread for each potential connection.
* Possible later refinement. Start one now, others only as needed.
*/
for (client = 0; client < MAX_NET_CLIENTS; client++) {
#if __WIN32__
cmd_listen_th[client] = (HANDLE)_beginthreadex (NULL, 0, cmd_listen_thread, (void*)client, 0, NULL);
if (cmd_listen_th[client] == NULL) {
text_color_set(DW_COLOR_ERROR);
dw_printf ("Could not create AGW command listening thread\n");
return;
}
#else
e = pthread_create (&cmd_listen_tid[client], NULL, cmd_listen_thread, (void *)(long)client);
if (e != 0) {
text_color_set(DW_COLOR_ERROR);
perror("Could not create AGW command listening thread");
return;
}
#endif
}
}
/*-------------------------------------------------------------------
*
* Name: connect_listen_thread
*
* Purpose: Wait for a connection request from an application.
*
* Inputs: arg - TCP port for server.
* Main program has default of 8000 but allows
* an alternative to be specified on the command line
*
* Outputs: client_sock - File descriptor for communicating with client app.
*
* Description: Wait for connection request from client and establish
* communication.
* Note that the client can go away and come back again and
* re-establish communication without restarting this application.
*
*--------------------------------------------------------------------*/
static THREAD_F connect_listen_thread (void *arg)
{
#if __WIN32__
struct addrinfo hints;
struct addrinfo *ai = NULL;
int err;
char server_port_str[12];
SOCKET listen_sock;
WSADATA wsadata;
snprintf (server_port_str, sizeof(server_port_str), "%d", (int)(long)arg);
#if DEBUG
text_color_set(DW_COLOR_DEBUG);
dw_printf ("DEBUG: serverport = %d = '%s'\n", (int)(long)arg, server_port_str);
#endif
err = WSAStartup (MAKEWORD(2,2), &wsadata);
if (err != 0) {
text_color_set(DW_COLOR_ERROR);
dw_printf("WSAStartup failed: %d\n", err);
return (0);
}
if (LOBYTE(wsadata.wVersion) != 2 || HIBYTE(wsadata.wVersion) != 2) {
text_color_set(DW_COLOR_ERROR);
dw_printf("Could not find a usable version of Winsock.dll\n");
WSACleanup();
//sleep (1);
return (0);
}
memset (&hints, 0, sizeof(hints));
hints.ai_family = AF_INET;
hints.ai_socktype = SOCK_STREAM;
hints.ai_protocol = IPPROTO_TCP;
hints.ai_flags = AI_PASSIVE;
err = getaddrinfo(NULL, server_port_str, &hints, &ai);
if (err != 0) {
text_color_set(DW_COLOR_ERROR);
dw_printf("getaddrinfo failed: %d\n", err);
//sleep (1);
WSACleanup();
return (0);
}
listen_sock= socket(ai->ai_family, ai->ai_socktype, ai->ai_protocol);
if (listen_sock == INVALID_SOCKET) {
text_color_set(DW_COLOR_ERROR);
dw_printf ("connect_listen_thread: Socket creation failed, err=%d", WSAGetLastError());
return (0);
}
#if DEBUG
text_color_set(DW_COLOR_DEBUG);
dw_printf("Binding to port %s ... \n", server_port_str);
#endif
err = bind( listen_sock, ai->ai_addr, (int)ai->ai_addrlen);
if (err == SOCKET_ERROR) {
text_color_set(DW_COLOR_ERROR);
dw_printf("Bind failed with error: %d\n", WSAGetLastError()); // TODO: translate number to text?
dw_printf("Some other application is probably already using port %s.\n", server_port_str);
dw_printf("Try using a different port number with AGWPORT in the configuration file.\n");
freeaddrinfo(ai);
closesocket(listen_sock);
WSACleanup();
return (0);
}
freeaddrinfo(ai);
#if DEBUG
text_color_set(DW_COLOR_DEBUG);
dw_printf("opened socket as fd (%d) on port (%s) for stream i/o\n", listen_sock, server_port_str );
#endif
while (1) {
int client;
int c;
client = -1;
for (c = 0; c < MAX_NET_CLIENTS && client < 0; c++) {
if (client_sock[c] <= 0) {
client = c;
}
}
/*
* Listen for connection if we have not reached maximum.
*/
if (client >= 0) {
if(listen(listen_sock, MAX_NET_CLIENTS) == SOCKET_ERROR)
{
text_color_set(DW_COLOR_ERROR);
dw_printf("Listen failed with error: %d\n", WSAGetLastError());
return (0);
}
text_color_set(DW_COLOR_INFO);
dw_printf("Ready to accept AGW client application %d on port %s ...\n", client, server_port_str);
client_sock[client] = accept(listen_sock, NULL, NULL);
if (client_sock[client] == -1) {
text_color_set(DW_COLOR_ERROR);
dw_printf("Accept failed with error: %d\n", WSAGetLastError());
closesocket(listen_sock);
WSACleanup();
return (0);
}
text_color_set(DW_COLOR_INFO);
// TODO: "attached" or some other term would be better because "connected" has a different meaning for AX.25.
dw_printf("\nConnected to AGW client application %d ...\n\n", client);
/*
* The command to change this is actually a toggle, not explicit on or off.
* Make sure it has proper state when we get a new connection.
*/
enable_send_raw_to_client[client] = 0;
enable_send_monitor_to_client[client] = 0;
}
else {
SLEEP_SEC(1); /* wait then check again if more clients allowed. */
}
}
#else /* End of Windows case, now Linux */
struct sockaddr_in sockaddr; /* Internet socket address stuct */
socklen_t sockaddr_size = sizeof(struct sockaddr_in);
int server_port = (int)(long)arg;
int listen_sock;
int bcopt = 1;
listen_sock= socket(AF_INET,SOCK_STREAM,0);
if (listen_sock == -1) {
text_color_set(DW_COLOR_ERROR);
perror ("connect_listen_thread: Socket creation failed");
return (NULL);
}
/* Version 1.3 - as suggested by G8BPQ. */
/* Without this, if you kill the application then try to run it */
/* again quickly the port number is unavailable for a while. */
/* Don't try doing the same thing On Windows; It has a different meaning. */
/* http://stackoverflow.com/questions/14388706/socket-options-so-reuseaddr-and-so-reuseport-how-do-they-differ-do-they-mean-t */
setsockopt (listen_sock, SOL_SOCKET, SO_REUSEADDR, (const char *)&bcopt, 4);
sockaddr.sin_addr.s_addr = INADDR_ANY;
sockaddr.sin_port = htons(server_port);
sockaddr.sin_family = AF_INET;
#if DEBUG
text_color_set(DW_COLOR_DEBUG);
dw_printf("Binding to port %d ... \n", server_port);
#endif
if (bind(listen_sock,(struct sockaddr*)&sockaddr,sizeof(sockaddr)) == -1) {
text_color_set(DW_COLOR_ERROR);
dw_printf("Bind failed with error: %d\n", errno);
dw_printf("%s\n", strerror(errno));
dw_printf("Some other application is probably already using port %d.\n", server_port);
dw_printf("Try using a different port number with AGWPORT in the configuration file.\n");
return (NULL);
}
getsockname( listen_sock, (struct sockaddr *)(&sockaddr), &sockaddr_size);
#if DEBUG
text_color_set(DW_COLOR_DEBUG);
dw_printf("opened socket as fd (%d) on port (%d) for stream i/o\n", listen_sock, ntohs(sockaddr.sin_port) );
#endif
while (1) {
int client;
int c;
client = -1;
for (c = 0; c < MAX_NET_CLIENTS && client < 0; c++) {
if (client_sock[c] <= 0) {
client = c;
}
}
if (client >= 0) {
if(listen(listen_sock,MAX_NET_CLIENTS) == -1)
{
text_color_set(DW_COLOR_ERROR);
perror ("connect_listen_thread: Listen failed");
return (NULL);
}
text_color_set(DW_COLOR_INFO);
dw_printf("Ready to accept AGW client application %d on port %d ...\n", client, server_port);
client_sock[client] = accept(listen_sock, (struct sockaddr*)(&sockaddr),&sockaddr_size);
text_color_set(DW_COLOR_INFO);
dw_printf("\nConnected to AGW client application %d...\n\n", client);
/*
* The command to change this is actually a toggle, not explicit on or off.
* Make sure it has proper state when we get a new connection.
*/
enable_send_raw_to_client[client] = 0;
enable_send_monitor_to_client[client] = 0;
}
else {
SLEEP_SEC(1); /* wait then check again if more clients allowed. */
}
}
#endif
}
/*-------------------------------------------------------------------
*
* Name: server_send_rec_packet
*
* Purpose: Send a received packet to the client app.
*
* Inputs: chan - Channel number where packet was received.
* 0 = first, 1 = second if any.
*
* pp - Identifier for packet object.
*
* fbuf - Address of raw received frame buffer.
* flen - Length of raw received frame.
*
*
* Description: Send message to client if connected.
* Disconnect from client, and notify user, if any error.
*
* There are two different formats:
* RAW - the original received frame.
* MONITOR - just the information part.
*
*--------------------------------------------------------------------*/
void server_send_rec_packet (int chan, packet_t pp, unsigned char *fbuf, int flen)
{
struct {
struct agwpe_s hdr;
char data[1+AX25_MAX_PACKET_LEN];
} agwpe_msg;
int err;
int info_len;
unsigned char *pinfo;
int client;
/*
* RAW format
*/
for (client=0; client<MAX_NET_CLIENTS; client++) {
if (enable_send_raw_to_client[client] && client_sock[client] > 0){
memset (&agwpe_msg.hdr, 0, sizeof(agwpe_msg.hdr));
agwpe_msg.hdr.portx = chan;
agwpe_msg.hdr.datakind = 'K';
ax25_get_addr_with_ssid (pp, AX25_SOURCE, agwpe_msg.hdr.call_from);
ax25_get_addr_with_ssid (pp, AX25_DESTINATION, agwpe_msg.hdr.call_to);
agwpe_msg.hdr.data_len_NETLE = host2netle(flen + 1);
/* Stick in extra byte for the "TNC" to use. */
agwpe_msg.data[0] = 0;
memcpy (agwpe_msg.data + 1, fbuf, (size_t)flen);
if (debug_client) {
debug_print (TO_CLIENT, client, &agwpe_msg.hdr, sizeof(agwpe_msg.hdr) + netle2host(agwpe_msg.hdr.data_len_NETLE));
}
#if __WIN32__
err = send (client_sock[client], (char*)(&agwpe_msg), sizeof(agwpe_msg.hdr) + netle2host(agwpe_msg.hdr.data_len_NETLE), 0);
if (err == SOCKET_ERROR)
{
text_color_set(DW_COLOR_ERROR);
dw_printf ("\nError %d sending message to AGW client application. Closing connection.\n\n", WSAGetLastError());
closesocket (client_sock[client]);
client_sock[client] = -1;
WSACleanup();
dlq_client_cleanup (client);
}
#else
err = write (client_sock[client], &agwpe_msg, sizeof(agwpe_msg.hdr) + netle2host(agwpe_msg.hdr.data_len_NETLE));
if (err <= 0)
{
text_color_set(DW_COLOR_ERROR);
dw_printf ("\nError sending message to AGW client application. Closing connection.\n\n");
close (client_sock[client]);
client_sock[client] = -1;
dlq_client_cleanup (client);
}
#endif
}
}
/* MONITOR format - only for UI frames. */
for (client=0; client<MAX_NET_CLIENTS; client++) {
if (enable_send_monitor_to_client[client] && client_sock[client] > 0
&& ax25_get_control(pp) == AX25_UI_FRAME){
time_t clock;
struct tm *tm;
int num_digi;
clock = time(NULL);
tm = localtime(&clock); // TODO: should use localtime_r
memset (&agwpe_msg.hdr, 0, sizeof(agwpe_msg.hdr));
agwpe_msg.hdr.portx = chan;
agwpe_msg.hdr.datakind = 'U';
ax25_get_addr_with_ssid (pp, AX25_SOURCE, agwpe_msg.hdr.call_from);
ax25_get_addr_with_ssid (pp, AX25_DESTINATION, agwpe_msg.hdr.call_to);
info_len = ax25_get_info (pp, &pinfo);
/* http://uz7ho.org.ua/includes/agwpeapi.htm#_Toc500723812 */
/* Description mentions one CR character after timestamp but example has two. */
/* Actual observed cases have only one. */
/* Also need to add extra CR, CR, null at end. */
/* The documentation example includes these 3 extra in the Len= value */
/* but actual observed data uses only the packet info length. */
// Documentation doesn't mention anything about including the via path.
// In version 1.4, we add that to match observed behaviour.
// This inconsistency was reported:
// Direwolf:
// [AGWE-IN] 1:Fm ZL4FOX-8 To Q7P2U2 [08:25:07]`I1*l V>/"9<}[:Barts Tracker 3.83V X
// AGWPE:
// [AGWE-IN] 1:Fm ZL4FOX-8 To Q7P2U2 Via WIDE3-3 [08:32:14]`I0*l V>/"98}[:Barts Tracker 3.83V X
num_digi = ax25_get_num_repeaters(pp);
if (num_digi > 0) {
char via[AX25_MAX_REPEATERS*(AX25_MAX_ADDR_LEN+1)];
char stemp[AX25_MAX_ADDR_LEN+1];
int j;
ax25_get_addr_with_ssid (pp, AX25_REPEATER_1, via);
for (j = 1; j < num_digi; j++) {
ax25_get_addr_with_ssid (pp, AX25_REPEATER_1 + j, stemp);
strlcat (via, ",", sizeof(via));
strlcat (via, stemp, sizeof(via));
}
snprintf (agwpe_msg.data, sizeof(agwpe_msg.data), " %d:Fm %s To %s Via %s <UI pid=%02X Len=%d >[%02d:%02d:%02d]\r%s\r\r",
chan+1, agwpe_msg.hdr.call_from, agwpe_msg.hdr.call_to, via,
ax25_get_pid(pp), info_len,
tm->tm_hour, tm->tm_min, tm->tm_sec,
pinfo);
}
else {
snprintf (agwpe_msg.data, sizeof(agwpe_msg.data), " %d:Fm %s To %s <UI pid=%02X Len=%d >[%02d:%02d:%02d]\r%s\r\r",
chan+1, agwpe_msg.hdr.call_from, agwpe_msg.hdr.call_to,
ax25_get_pid(pp), info_len,
tm->tm_hour, tm->tm_min, tm->tm_sec,
pinfo);
}
agwpe_msg.hdr.data_len_NETLE = host2netle(strlen(agwpe_msg.data) + 1) /* +1 to include terminating null */ ;
if (debug_client) {
debug_print (TO_CLIENT, client, &agwpe_msg.hdr, sizeof(agwpe_msg.hdr) + netle2host(agwpe_msg.hdr.data_len_NETLE));
}
#if __WIN32__
err = send (client_sock[client], (char*)(&agwpe_msg), sizeof(agwpe_msg.hdr) + netle2host(agwpe_msg.hdr.data_len_NETLE), 0);
if (err == SOCKET_ERROR)
{
text_color_set(DW_COLOR_ERROR);
dw_printf ("\nError %d sending message to AGW client application %d. Closing connection.\n\n", WSAGetLastError(), client);
closesocket (client_sock[client]);
client_sock[client] = -1;
WSACleanup();
dlq_client_cleanup (client);
}
#else
err = write (client_sock[client], &agwpe_msg, sizeof(agwpe_msg.hdr) + netle2host(agwpe_msg.hdr.data_len_NETLE));
if (err <= 0)
{
text_color_set(DW_COLOR_ERROR);
dw_printf ("\nError sending message to AGW client application %d. Closing connection.\n\n", client);
close (client_sock[client]);
client_sock[client] = -1;
dlq_client_cleanup (client);
}
#endif
}
}
} /* server_send_rec_packet */
/*-------------------------------------------------------------------
*
* Name: server_link_established
*
* Purpose: Send notification to client app when a link has
* been established with another station.
*
* DL-CONNECT Confirm or DL-CONNECT Indication in the protocol spec.
*
* Inputs: chan - Which radio channel.
*
* client - Which one of potentially several clients.
*
* remote_call - Callsign[-ssid] of remote station.
*
* own_call - Callsign[-ssid] of my end.
*
* incoming - true if connection was initiated from other end.
* false if this end started it.
*
*--------------------------------------------------------------------*/
void server_link_established (int chan, int client, char *remote_call, char *own_call, int incoming)
{
struct {
struct agwpe_s hdr;
char info[100];
} reply;
memset (&reply, 0, sizeof(reply));
reply.hdr.portx = chan;
reply.hdr.datakind = 'C';
strlcpy (reply.hdr.call_from, remote_call, sizeof(reply.hdr.call_from));
strlcpy (reply.hdr.call_to, own_call, sizeof(reply.hdr.call_to));
if (incoming) {
// Other end initiated the connection.
snprintf (reply.info, sizeof(reply.info), "*** CONNECTED To Station %s\r", remote_call);
}
else {
// We started the connection.
snprintf (reply.info, sizeof(reply.info), "*** CONNECTED With Station %s\r", remote_call);
}
reply.hdr.data_len_NETLE = host2netle(strlen(reply.info) + 1);
send_to_client (client, &reply);
} /* end server_link_established */
/*-------------------------------------------------------------------