Newer
Older
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
/*
* Copyright (C) Telefonica 2015
* All rights reserved.
*
* Telefonica Proprietary Information.
*
* Contains proprietary/trade secret information which is the property of
* Telefonica and must not be made available to, or copied or used by
* anyone outside Telefonica without its written authorization.
*
* Authors:
* Matteo Varvello <matteo.varvello@telefonica.com> et al.
*
* Description:
* An SSL/SPP client that connects to an SSL/SPP through a bunch of
* proxies.
*/
#include <stdbool.h> // to support boolean
#include "common.h" // common library between client and server
#include <pthread.h> // thread support
#define KEYFILE "client.pem" // client certificate
#define PASSWORD "password" // unused now
//#define DEBUG // verbose logging
#define CONNECT_TIMEOUT 5 // socket connection timeout
#define MAX_CONC_CLIENT 100 // max concurrent clients
static char *host=HOST;
static int port=PORT;
static int require_server_auth = 1;
static int clientID=0;
// -- Moved up here just because of thread
static SSL *ssl; // SSL instance
static int plain_socket;
static char *proto = "ssl"; // protocol to use (ssl ; spp)
static int stats=0; // Report byte statistics boolean
static int sizeCheck;
static ExperimentInfo *experiment_info; // for printing stats at the end
static int lines = 0; // number of lines in action file
static long fSize = 0;
//nagle stuff
static int disable_nagle = 0;
// allow acces to number of slices also for SSL
static int slices_len = 0; // number of slices
// Thread syncronization variables
static int done = 0;
static pthread_mutex_t m = PTHREAD_MUTEX_INITIALIZER;
static pthread_cond_t c = PTHREAD_COND_INITIALIZER;
static bool running = true;
// Thread sync functions
pthread_cond_wait(pthread_cond_t *c, pthread_mutex_t *m);
pthread_cond_signal(pthread_cond_t *c);
// thread exit
void thr_exit() {
pthread_mutex_lock(&m);
done = 1;
pthread_cond_signal(&c);
pthread_mutex_unlock(&m);
}
// Join
void thr_join() {
pthread_mutex_lock(&m);
while (done == 0){
pthread_cond_wait(&c, &m);
}
pthread_mutex_unlock(&m);
}
// function to plot statistics
void print_stats(SSL *s);
// Compute the size of a file to be served
int calculate_file_size(char *filename){
FILE *fp;
int sz = 0;
// Open file
fp = fopen(filename,"r");
// Check for errors while opening file
if(fp == NULL){
printf("Error while opening file %s.\r\n", filename);
exit(-1);
}
// Seek to the end of the file and ask for position
fseek(fp, 0L, SEEK_END);
sz = ftell(fp);
//fseek(fp, 0L, SEEK_SET);
// Close file
fclose (fp);
// Return file size
#ifdef DEBUG
printf ("[DEBUG] File requested is <<%s>> with size <<%d bytes>>\n", filename, sz);
#endif
return sz;
}
// Read counter of number of proxies in the provided list
int read_proxy_count(char *file_name){
FILE *fp; // pointer to file
int N; // number of proxies
char line [128]; // maximum size of line to read from
// Open file for reading
fp = fopen(file_name,"r");
// CHheck for errors while opening file
if( fp == NULL ){
printf("Error while opening file %s.\r\n", file_name);
exit(-1);
}
// Read first line of file
fgets ( line, sizeof line, fp );
// Convert char into integer
N = atoi(line);
#ifdef DEBUG
printf("[DEBUG] Expected number of proxies is: %d\r\n", N);
#endif
// Close file
fclose(fp);
return N;
}
// Function to read a proxy list from file and populate array of proxies
void read_proxy_list(char *file_name, SPP_PROXY **proxies){
FILE *fp; // pointer to file
int count = 0; // simple counters
bool firstLine = 1; // flag for first line in file
char line [128]; // maximum size of line to read from
// Open file for reading
fp = fopen(file_name,"r");
// Check for errors while opening file
if( fp == NULL ){
printf("Error while opening file %s.\r\n", file_name);
exit(-1);
}
// Read file line-by-line
while ( fgets ( line, sizeof line, fp ) != NULL ) {
// Remove trailing newline (NOTE: strtoK is not thread safe)
strtok(line, "\n");
// Handle first line as a special case
if (firstLine){
firstLine = 0;
continue;
}
// Generate a proxy from IP address just read
char *newLine;
newLine = (char *)malloc(strlen(line)+1);
strcpy(newLine, line);
proxies[count] = SPP_generate_proxy(ssl, newLine);
count++;
}
// Close file
fclose(fp);
}
// Print proxy list
void print_proxy_list(SPP_PROXY **proxies, int N){
int i;
if (N == 1){
printf("[DEBUG] There is %d available proxy (the final server):\r\n", N);
}else{
printf("[DEBUG] There are %d available proxies:\r\n", N);
}
for (i = 0; i < N; i++){
printf("\t[PROXY] Proxy %d with address %s\r\n", i, proxies[i]->address);
}
}
/*
// Timeout for connect
static int sTimeout = 0;
// Handler for alarm raised by TCP connect
static void AlarmHandler(int sig) {
sTimeout = 1;
}
*/
// TCP connect function
int tcp_connect(char *host, int port){
struct hostent *hp;
struct sockaddr_in addr;
int sock;
// Resolve host
if(!(hp = gethostbyname(host))){
berr_exit("Couldn't resolve host");
}
#ifdef DEBUG
printf("[DEBUG] Host %s resolved\n", host);
#endif
memset(&addr, 0, sizeof(addr));
addr.sin_addr = *(struct in_addr*)
hp->h_addr_list[0];
addr.sin_family = AF_INET;
addr.sin_port = htons(port);
if((sock=socket(AF_INET,SOCK_STREAM, IPPROTO_TCP))<0){
err_exit("Couldn't create socket");
}
#ifdef DEBUG
printf("[DEBUG] Socket correctly created\n");
#endif
if (disable_nagle == 1)
set_nagle(sock, 1);
if(connect(sock,(struct sockaddr *)&addr, sizeof(addr))<0){
err_exit("Couldn't connect socket");
}
#ifdef DEBUG
printf("[DEBUG] Socket connected\n");
#endif
/* Check solution below if we need to support a timeout -- to debug
signal(SIGALRM, AlarmHandler);
sTimeout = 0;
alarm(CONNECT_TIMEOUT);
if ( connect(sock, (struct sockaddr *) &addr, sizeof(addr)) ){
if ( sTimeout ){
err_exit("timeout connecting stream socket");
}
}
sTimeout = 0;
alarm(CONNECT_TIMEOUT);
*/
return sock;
}
/* Check that the common name matches the host name*/
void check_cert(char *host){
X509 *peer;
char peer_CN[256];
long res = SSL_get_verify_result(ssl);
if ((res == X509_V_ERR_DEPTH_ZERO_SELF_SIGNED_CERT) || (res == X509_V_ERR_SELF_SIGNED_CERT_IN_CHAIN)){
#ifdef DEBUG
printf("[DEBUG] Self signed certificate accepted\n");
#endif
} else {
if(res != X509_V_OK)
berr_exit("Certificate doesn't verify\n");
}
/*Check the cert chain. The chain length
is automatically checked by OpenSSL when
we set the verify depth in the ctx */
/*Check the common name*/
peer=SSL_get_peer_certificate(ssl);
X509_NAME_get_text_by_NID (X509_get_subject_name(peer), NID_commonName, peer_CN, 256);
// WARNING NO VALIDATION Validate the hostname
/*
if (1) {
printf("Peer_CN = %s\n", peer_CN);
printf("Host = %s\n\n", host);
//err_exit("Common name doesn't match host name");
}
*/
}
// Check for SSL_write error (just write at this point) -- TO DO: check behavior per slice
void check_SSL_write_error(int r, int request_len){
switch(SSL_get_error(ssl, r)){
case SSL_ERROR_NONE:
if(request_len != r){
err_exit("Incomplete write!");
}
break;
default:
berr_exit("SSL write problem");
}
}
// Perform a connect
void doConnect (char *proto, int slices_len, int N_proxies, SPP_SLICE **slice_set, SPP_PROXY **proxies){
// SPP CONNECT
if (strcmp(proto, "spp") == 0){
#ifdef DEBUG
printf("[DEBUG] SPP_connect\n");
#endif
if (SPP_connect(ssl, slice_set, slices_len, proxies, N_proxies) <= 0){
berr_exit("SPP connect error");
}
}
// SSL CONNECT
if (strcmp(proto, "ssl") == 0){
#ifdef DEBUG
printf("[DEBUG] SSL_connect\n");
#endif
if(SSL_connect(ssl) <= 0)
berr_exit("SSL connect error");
}
// TO DO -- Check here
if(require_server_auth){
#ifdef DEBUG
printf("[DEBUG] Check certificate\n");
#endif
check_cert(host);
}
}
// Form and send GET
void sendRequestBrowser(char *filename){
#ifdef DEBUG
printf("[DEBUG] Inside sendRequestBrowser. Slices_len=%d\n", slices_len);
#endif
int r, j;
int req_len_arr[50];
int request_len = 0;
// extract list of sizes for requests and response
char **s_Token;
int size_alloc;
int entries = TokenizeString(filename, &s_Token, &size_alloc, ';');
char *str = s_Token[0];
char *resp_sizes = s_Token[1];
for (j = 0; j < entries ; j++){
#ifdef VERBOSE
printf("[DEBUG] Found string %s (length %d) - Tot entries: %d\n", s_Token[j], strlen(s_Token[j]), entries);
#endif
}
// parse request sizes and save
char **s_Token1;
int countSlice = TokenizeString(str, &s_Token1, &size_alloc, '_');
#ifdef DEBUG
printf("[DEBUG] String for request header is %s (length %d, %d slices)\n", str, strlen(str), countSlice);
#endif
for(j = 0; j < countSlice; j++){
req_len_arr[j] = atoi(s_Token1[j]);
#ifdef VERBOSE
printf("[VERBOSE]\tTokenized string is %s (value %d) - Tot entries:%d\n", s_Token1[j], req_len_arr[j], countSlice);
#endif
request_len += req_len_arr[j];
}
// compute total response size (no need to save each size)
fSize = 0;
char **s_Token2;
int count = TokenizeString(resp_sizes, &s_Token2, &size_alloc, '_');
#ifdef DEBUG
printf("[DEBUG] String for response sizes is %s (length %d, %d slices)\n", resp_sizes, strlen(resp_sizes), count);
#endif
for(j = 0; j < count; j++){
fSize += atol(s_Token2[j]);
#ifdef VERBOSE
printf("[VERBOSE]\tTokenized string is %s (value %d) - Tot entries: %d\n", s_Token2[j], req_len_arr[j], count);
#endif VERBOSE
}
// prepare common GET request
char get_str[200];
memset(get_str, '0', sizeof(get_str));
int get_len;
sprintf(get_str, "Get %s HTTP/1.1\r\nUser-Agent:SVA-%d\r\nHost: %s:%d\nPadding:", resp_sizes, clientID, host, port);
get_len = strlen(get_str);
#ifdef DEBUG
printf ("[DEBUG] GET string (size %d):\n%s\n", get_len, get_str);
#endif
//prepare final request with appropriate padding
char *request;
int actual_request_len;
char *padding=NULL;
int toAllocate;
if (strcmp(proto, "spp") == 0){
toAllocate = (req_len_arr[0] - get_len);
} else {
toAllocate = (request_len - get_len);
}
if (toAllocate < 0) {
toAllocate = 0;
}
// Deal with the case when the GET is bigger than requested slice 0
if (toAllocate < 0){
toAllocate = 0;
}
// Logging
#ifdef DEBUG
printf ("[DEBUG] Allocating %d for padding\n", toAllocate + 1);
#endif
padding = (char*) malloc(toAllocate + 1);
memset(padding, '?', toAllocate);
padding[toAllocate] = 0;
if (strcmp(proto, "spp") == 0){
actual_request_len = (req_len_arr[0] > strlen(get_str) ? req_len_arr[0] : strlen(get_str)) + 1;
}else{
actual_request_len = (request_len > strlen(get_str) ? request_len : strlen(get_str)) + 1;
}
request = (char *)malloc(actual_request_len);
// Copy get_str without \0
memcpy(request, get_str, strlen(get_str));
// Copy padding with \0
memcpy(request+strlen(get_str), padding, strlen(padding)+1);
#ifdef DEBUG
printf ("[DEBUG] Padded GET request (size %d):\n", strlen(request));
#endif
#ifdef VERBOSE
printf ("[DEBUG] Content:\n%s\n", request);
#endif
// SPP write
if (strcmp(proto, "spp") == 0){
int i;
//for (i = 0; i < ssl->slices_len; i++){
for (i = 0; i < countSlice; i++){
#ifdef DEBUG
printf("[DEBUG] SPP_write (slice %d)\n", i);
#endif
if (i == 0){
#ifdef DEBUG
printf ("[DEBUG] Send GET request with slice %d. Actual size %d -- size requested %d.\n", i, strlen(request), req_len_arr[i]);
#endif
r = SPP_write_record(ssl, request, strlen(request)+1, ssl->slices[i]); // req_len_arr[i]
//r = SPP_write_record(ssl, request, strlen(request), ssl->slices[i]);
#ifdef DEBUG
printf ("[DEBUG] Send GET request with slice %d. Actual size %d -- size requested %d. SPP_write returned %d\n", i, strlen(request), req_len_arr[i], r);
#endif
// Check for errors
//check_SSL_write_error(r, req_len_arr[i]);
check_SSL_write_error(r, strlen(request)+1);
#ifdef DEBUG
printf("[DEBUG] Wrote %d bytes (on slice %d)\n", r, i);
#endif
}else{
// prepare fake request slices if needed
if (req_len_arr[i] > 0){
#ifdef DEBUG
printf ("[DEBUG] Send padding with slice %d (size %d)\n", i, req_len_arr[i]);
#endif
char *fake_request = (char*) malloc(req_len_arr[i] + 1);
memset(fake_request, '?', req_len_arr[i]);
fake_request[req_len_arr[i]] = 0;
#ifdef VERBOSE
printf ("[DEBUG] Prepared padding:\n%s\n", fake_request);
#endif
r = SPP_write_record(ssl, fake_request, req_len_arr[i], ssl->slices[i]);
//r = SPP_write_record(ssl, fake_request, strlen(fake_request), ssl->slices[i]);
// Check for errors
//check_SSL_write_error(r, req_len_arr[i]);
check_SSL_write_error(r, strlen(fake_request));
// logging
#ifdef DEBUG
printf("[DEBUG] Wrote %d bytes (on slice %d)\n", r, i);
#endif
// free memory
free(fake_request);
}else{
#ifdef DEBUG
printf("[DEBUG] Passing here - i=%d, tot=%d\n", i, ssl->slices_len);
#endif
}
}
}
}
// SSL write
else if (strcmp(proto, "ssl") == 0){
#ifdef DEBUG
printf("[DEBUG] SSL_write\n");
#endif
//r = SSL_write(ssl, request, request_len);
r = SSL_write(ssl, request, strlen(request));
//check_SSL_write_error(r, request_len);
check_SSL_write_error(r, strlen(request));
}
// socket write
else if (strcmp(proto, "pln") == 0){
#ifdef DEBUG
printf("[DEBUG] Plain socket write\n");
#endif
//r = write(plain_socket, request, strlen(request));
r = write(plain_socket, request, request_len);
experiment_info->app_bytes_written += r;
if ( r <= 0 ){
printf("[ERROR] Something went wrong with writing to the socket!\n");
}
#ifdef DEBUG
printf("[DEBUG] Request sent. %d bytes\n", r);
#endif
}
// free memory
free(padding);
free(request);
for (j = 0; j < entries ; j++){
free (s_Token[j]);
}
for (j = 0; j < countSlice ; j++){
free (s_Token1[j]);
}
for (j = 0; j < count ; j++){
free (s_Token2[j]);
}
free(s_Token);
free(s_Token1);
free(s_Token2);
}
// Form and send GET
void sendRequest(char *filename){
char request[200];
int request_len;
// Form the request
memset(request, '0', sizeof(request));
sprintf(request, "Get %s HTTP/1.1\r\nUser-Agent:SVA-%d\r\nHost: %s:%d\r\n\r\n", filename, clientID, host, port);
request_len = strlen(request);
// SPP write
if (strcmp(proto, "spp") == 0){
#ifdef DEBUG
printf("[DEBUG] SPP_write\n");
#endif
// Use slice 0 as default for sending (HEADER)
int r = SPP_write_record(ssl, request, request_len, ssl->slices[0]);
#ifdef DEBUG
printf("[DEBUG] Wrote %d bytes\n", r);
#endif
check_SSL_write_error(r, request_len);
}
// SSL write
else if (strcmp(proto, "ssl") == 0){
#ifdef DEBUG
printf("[DEBUG] SSL_write\n");
#endif
int r = SSL_write(ssl, request, request_len);
check_SSL_write_error(r, request_len);
}
// socket write
else if (strcmp(proto, "pln") == 0){
#ifdef DEBUG
printf("[DEBUG] Plain socket write\n");
#endif
int r = write(plain_socket, request, request_len);
experiment_info->app_bytes_written += r;
if ( r <= 0 )
{
printf("Something went wrong with writing to the socket!\n");
}
#ifdef DEBUG
printf("[DEBUG] Request sent. %d bytes\n", r);
#endif
}
}
// Read file line by line with timing information
static void *browser_replay(void *ptr){
char line[300];
//int previous_time = 0; // current/previous time
FILE *fp; // pointer to file
int curr_line = 0; // keep track of line read
#ifdef DEBUG
printf("[DEBUG] Read file timing\n");
#endif
// Retrive filename from (void *)
char *file_name = (char *)ptr;
// Open file for reading
fp = fopen(file_name,"r");
// Check for errors while opening file
if( fp == NULL ){
printf("Error while opening file %s.\r\n", file_name);
return NULL;
}
// Read file line-by-line
while ( fgets ( line, sizeof line, fp ) != NULL && curr_line < lines) {
double time;
//double duration;
char file_request[128];
// Current line read in the file
curr_line ++;
// Remove trailing newline (NOTE: strtoK is not thread safe)
strtok(line, "\n");
#ifdef DEBUG
printf("[DEBUG] Read line is <<%s>>\n", line);
#endif
// Parse line
//sscanf(line, "%lf %lf", &time, &duration);
sscanf(line, "%lf %s", &time, file_request);
// Logging
#ifdef DEBUG
//printf("[DEBUG] Extracted values are: %f -- %f\n", time, duration);
printf("[DEBUG] Extracted values are: %f -- %s\n", time, file_request);
#endif
/* Original code to relay timing information from traces
// Compute sleeping time
double time_to_sleep = time - previous_time;
#ifdef DEBUG
printf("[DEBUG] Sleeping for %f\n", time_to_sleep);
#endif
sleep(time_to_sleep);
*/
// Send HTTP GET
#ifdef DEBUG
printf("[DEBUG] Sending GET request for <<%s>> bytes of data\n", file_request);
#endif
if (curr_line == lines){
#ifdef DEBUG
printf("[DEBUG] File has %d GET and we sent %d. Reading thread is done\n", lines, curr_line);
#endif
running = false;
}
sendRequestBrowser(file_request);
// Wait on main thread to have received requested data unless we are done
if (curr_line < lines){
#ifdef DEBUG
printf("[DEBUG] Wait on main thread");
#endif
thr_join();
}
done = 0;
/* Not used
// Save current time
previous_time = time;
*/
}
#ifdef DEBUG
printf("[DEBUG] Closing file\n");
#endif
// Close file
fclose(fp);
// All good
return NULL;
}
// Emulate browser behavior based on some input traces
static int http_complex(char *proto, char *fn, struct timeval *tvEnd){
int r;
char buf[BUFSIZZ];
long bytes_read = 0;
// Thread for browser-like behavior
pthread_t reading_thread;
if(pthread_create(&reading_thread, NULL, browser_replay, fn)) {
fprintf(stderr, "Error creating thread\n");
return -1;
}else{
#ifdef DEBUG
printf("[DEBUG] Reading thread started!\n");
#endif
}
// Now read the server's response, assuming that it's terminated by a close
while(1){
// SPP read
if (strcmp(proto, "spp") == 0){
#ifdef DEBUG
printf("[DEBUG] Waiting on SPP_read...\n");
#endif
SPP_SLICE *slice; // slice for SPP_read
SPP_CTX *ctx; // context pointer for SPP_read
r = SPP_read_record(ssl, buf, BUFSIZZ, &slice, &ctx);
}
// SSL read
else if (strcmp(proto, "ssl") == 0){
#ifdef DEBUG
printf("[DEBUG] Waiting on SSL_read...\n");
#endif
r = SSL_read(ssl, buf, BUFSIZZ);
}
// TCP read
else if (strcmp(proto, "pln") == 0){
r = read(plain_socket, buf, BUFSIZZ);
experiment_info->app_bytes_read += r;
}
// Check for errors in read
if (strcmp(proto, "spp") == 0 || strcmp(proto, "ssl") == 0){
switch(SSL_get_error(ssl, r)){
case SSL_ERROR_NONE: break;
case SSL_ERROR_ZERO_RETURN: berr_exit("SSL error zero return");
case SSL_ERROR_SYSCALL: berr_exit("SSL Error: Premature close");
default: berr_exit("SSL read problem");
}
}
#ifdef DEBUG
printf("Read %d bytes\n", r);
#endif
// Write buf to stdout
#ifdef VERBOSE
printf("[DEBUG] Received:\n%s\n\n", buf);
#endif
// Update counter of bytes read
bytes_read += r;
//if ( r <= 0 || bytes_read == fSize){
#ifdef DEBUG
printf("[DEBUG] File transfer stats %d -- %ld\n", bytes_read, fSize);
#endif
if (bytes_read == fSize){
#ifdef DEBUG
printf("[DEBUG] File transfer done - signaling to other thread\n");
#endif
bytes_read = 0;
if (running){
thr_exit();
}else{
#ifdef DEBUG
printf("[DEBUG] Reading thread is done, so here we are done too\n");
#endif
break;
}
}
}
// Measure time
gettimeofday(tvEnd, NULL);
// Shutdown connection
#ifdef DEBUG
printf("[DEBUG] Shutdown was requested -- HERE\n");
#endif
r = SSL_shutdown(ssl);
if( !r ){
shutdown(SSL_get_fd(ssl), 1);
r = SSL_shutdown(ssl);
}
switch(r){
case 1:
break; // Success
case 0:
case -1:
default:
#ifdef DEBUG
printf ("Shutdown failed with code %d\n", r);
#endif
berr_exit("Shutdown failed");
}
// Print byte statistics
if (stats){
print_stats(ssl);
}
// Free ssl
SSL_free(ssl);
// All good
return(0);
}
// Send HTTP get and wait for response (SSL/SPP)
static int http_request(char *filename, char *proto, bool requestingFile, struct timeval *tvEnd){
char buf[BUFSIZZ];
int r;
int len;
long bytes_read = 0;
// Compute expected data size
fSize = atoi(filename);
if (fSize == 0 && filename[0] != '0'){
if (requestingFile){
fSize = calculate_file_size(filename);
}else{
fSize = strlen("HTTP/1.0 200 OK\r\n");
}
}
sizeCheck = fSize;
experiment_info->file_size = fSize;
// Request file (either by name or by size)
if (requestingFile){
sendRequest(filename);
}
// Now read the server's response, assuming that it's terminated by a close
while(1){
// SPP read
if (strcmp(proto, "spp") == 0){
/*
#ifdef DEBUG
printf("[DEBUG] SPP_read\n");
#endif
*/
SPP_SLICE *slice; // slice for SPP_read
SPP_CTX *ctx; // context pointer for SPP_read
r = SPP_read_record(ssl, buf, BUFSIZZ, &slice, &ctx);
#ifdef DEBUG
printf("[INFO] Read %d bytes\n", r);
#endif
if (ssl->read_stats.app_bytes == fSize){
printf("[INFO] Read %d bytes as expected (fSize=%d). Stopping timer\n", ssl->read_stats.app_bytes, fSize);
// Stop the timer here (avoid shutdown crap)
gettimeofday(tvEnd, NULL);
#ifdef VERBOSE
fwrite(buf, 1, len, stdout);
#endif
break;
//goto shutdown;
}
switch(SSL_get_error(ssl, r)){
case SSL_ERROR_NONE:
len = r;
break;
case SSL_ERROR_ZERO_RETURN:
goto shutdown;
case SSL_ERROR_SYSCALL:
fprintf(stderr, "SSL Error: Premature close\n");
goto done;
default:
berr_exit("SSL read problem");
}
}
// SSL read
else if (strcmp(proto, "ssl") == 0){
/*
#ifdef DEBUG
printf("[DEBUG] SSL_read\n");
#endif
*/
r = SSL_read(ssl, buf, BUFSIZZ);
#ifdef DEBUG
printf("[DEBUG] Read %d bytes\n", r);
#endif
if (ssl->read_stats.app_bytes == fSize){
printf("[INFO] Read %d bytes as expected (fSize=%d). Stopping timer\n", ssl->read_stats.app_bytes, fSize);
gettimeofday(tvEnd, NULL);
// Write buf to stdout
#ifdef VERBOSE
fwrite(buf, 1, len, stdout);
#endif
break;
}
switch(SSL_get_error(ssl, r)){
case SSL_ERROR_NONE:
len = r;
break;
case SSL_ERROR_ZERO_RETURN:
goto shutdown;
case SSL_ERROR_SYSCALL:
fprintf(stderr, "SSL Error: Premature close\n");
goto done;
default:
berr_exit("SSL read problem");
}
}
// SSL read
else if (strcmp(proto, "pln") == 0){
#ifdef DEBUG
printf("[DEBUG] Waiting to read bytes in plain mode\n");
#endif
r = read(plain_socket, buf, BUFSIZZ);
experiment_info->app_bytes_read += r;
bytes_read += r;
#ifdef DEBUG
printf("[DEBUG] Read %d bytes\n", r);
#endif
if ( r <= 0 || bytes_read == fSize) /* done reading */
{
#ifdef DEBUG
printf("[DEBUG] File transfer done, done reading socket...\n");
#endif
gettimeofday(tvEnd, NULL);
// Write buf to stdout
#ifdef VERBOSE
fwrite(buf, 1, len, stdout);
#endif
goto done;
}
}
// Write buf to stdout
#ifdef VERBOSE
fwrite(buf, 1, len, stdout);
#endif
}
shutdown:
#ifdef DEBUG
printf("[DEBUG] Shutdown was requested\n");
#endif
r = SSL_shutdown(ssl);
if( !r ){
shutdown(SSL_get_fd(ssl), 1);
r = SSL_shutdown(ssl);
}
switch(r){
case 1:
break; // Success
case 0:
case -1:
default:
#ifdef DEBUG
printf ("Shutdown failed with code %d\n", r);
#endif
berr_exit("Shutdown failed");
}
done:
if (stats){
print_stats(ssl);
}
SSL_free(ssl);
return(0);
}
// report "BYTE STATISITICS"
void print_stats(SSL *s) {
int total_read, total_write, app_read, app_write;
if (strcmp(proto, "pln") == 0) {
total_read = app_read = experiment_info->app_bytes_read;
total_write = app_write = experiment_info->app_bytes_written;
} else {
total_read = s->read_stats.bytes;
total_write = s->write_stats.bytes;
app_read = s->read_stats.app_bytes;
app_write = s->write_stats.app_bytes;
}
printf("[RESULTS] BYTE STATISITICS:\n");
printf("[RESULTS] Bytes read: %d\n", total_read);
printf("[RESULTS] Application bytes read: %d [Expected %d]\n", app_read, sizeCheck);
printf("[RESULTS] Block padding bytes read: %d\n", s->read_stats.pad_bytes);
printf("[RESULTS] Header bytes read: %d\n", s->read_stats.header_bytes);
printf("[RESULTS] Handshake bytes read: %d\n", s->read_stats.handshake_bytes);
printf("[RESULTS] MAC bytes read: %d\n", s->read_stats.mac_bytes);
printf("[RESULTS] Alert bytes read: %d\n", s->read_stats.alert_bytes);
printf("[RESULTS] Bytes write: %d\n", total_write);
printf("[RESULTS] Application bytes write: %d\n", app_write);
printf("[RESULTS] Block padding bytes write: %d\n", s->write_stats.pad_bytes);
printf("[RESULTS] Header bytes write: %d\n", s->write_stats.header_bytes);
printf("[RESULTS] Handshake bytes write: %d\n", s->write_stats.handshake_bytes);
printf("[RESULTS] MAC bytes write: %d\n", s->write_stats.mac_bytes);
printf("[RESULTS] Alert bytes write: %d\n", s->write_stats.alert_bytes);
// In one line (so it's easy for plotting script).
// num_slices num_mboxes file_size total app_total padding_total header_total handshake_total MAC_total alert_bytes
printf("[RESULTS] ByteStatsSummary %d %d %d %d %d %d %d %d %d %d\n",
experiment_info->num_slices,
experiment_info->num_proxies,
experiment_info->file_size,
total_read + total_write,
app_read + app_write,
s->read_stats.pad_bytes + s->write_stats.pad_bytes,
s->read_stats.header_bytes + s->write_stats.header_bytes,
s->read_stats.handshake_bytes + s->write_stats.handshake_bytes,
s->read_stats.mac_bytes + s->write_stats.mac_bytes,
s->read_stats.alert_bytes + s->write_stats.alert_bytes);
}
// Usage function
void usage(void){
printf("usage: wclient -s -r -w -i -f -o -a -c -b\n");
printf("-s: number of slices requested (min 1)\n");
printf("-r: number of proxies with read access (per slice)\n");
printf("-w: number of proxies with write access (per slice)\n");
printf("-i: integrity check\n");
printf("-f: file for http GET (either via <name> (require file to exhist both at server and client[for testing reasons]) or via <size>)\n");
printf("-o: {1=test handshake ; 2=200 OK ; 3=file transfer ; 4=browser-like behavior}\n");
printf("-a: action file for browser-like behavior\n");
printf("-c: protocol chosen (ssl ; spp; pln; fwd; spp-mod; ssl-mod; fwd-mod; pln-mod)\n");
printf("-b: report byte statistics\n");
exit(-1);
}
/* Compute a time difference - NOTE: Return 1 if the difference is negative, otherwise 0 [now defined in the library]
int timeval_subtract(struct timeval *result, struct timeval *t2, struct timeval *t1)
{
long int diff = (t2->tv_usec + 1000000 * t2->tv_sec) - (t1->tv_usec + 1000000 * t1->tv_sec);
result->tv_sec = diff / 1000000;
result->tv_usec = diff % 1000000;
return (diff<0);
}
*/
// Main function
int main(int argc, char **argv){
SSL_CTX *ctx; // SSL context
BIO *sbio;
int sock; // socket descriptor
extern char *optarg; // user input parameters
int c; // user iput from getopt
char *filename = "proxyList"; // filename for proxy
int r = 0, w = 0; // slice related parameters
char *file_requested = "index.html"; // file requeste for HTTP GET
SPP_SLICE **slice_set; // slice array
SPP_PROXY **proxies; // proxy array
int N_proxies = 0; // number of proxies in path
int action = 0; // specify client/server behavior (handshake, 200OK, serve file, browser-like)
char *file_action = NULL; // file action to use for browser-liek behavior
struct timeval tvBeginConnect;
struct timeval tvEndConnect;
struct timeval tvBegin, tvEnd;
struct timeval tvConnect, tvDuration; // time structures for handshake duration
experiment_info = (ExperimentInfo*)malloc(sizeof(ExperimentInfo));
experiment_info->app_bytes_read = 0;
experiment_info->app_bytes_written = 0;
#ifdef DEBUG
printf("\n\n******************** CLIENT STARTING ********************\n");
#endif
// Handle user input parameters
while((c = getopt(argc, argv, "s:r:w:i:f:c:o:a:b:")) != -1){
switch(c){
// Number of slices
case 's': if(! (slices_len = atoi(optarg) )){
err_exit("Bogus number of slices specified (no. of slices need to be > 1)");
}
experiment_info->num_slices = slices_len;
break;
// Number of proxies with read access (per slice)
case 'r': r = atoi(optarg);
break;
// Number of proxies with write access (per slice)
case 'w': w = atoi(optarg);
break;
// Integrity check requested
case 'i': require_server_auth = 0;
break;
// Protocol chosen
case 'c': if(! (proto = strdup(optarg) )){
err_exit("Out of memory");
}
if (strcmp(proto, "spp_mod") == 0){
proto = "spp";
disable_nagle = 1;
}
if (strcmp(proto, "ssl_mod") == 0){
proto = "ssl";
disable_nagle = 1;
}
if (strcmp(proto, "fwd_mod") == 0){
proto = "fwd";
disable_nagle = 1;
}
if (strcmp(proto, "pln_mod") == 0){
proto = "pln";
disable_nagle = 1;
}
if (strcmp(proto, "fwd") == 0){
proto = "ssl";
}
break;
// File requested for HTTP GET
case 'f': if(! (file_requested = strdup(optarg) )){
err_exit("Out of memory");
}
break;
// Client/Server behavior
case 'o': action = atoi(optarg);
if (action == 2)
{
action = 3;
file_requested = "1";
}
break;
// Action file
// NOTE: necessary only if -o 4, i.e., browser-like behavior
case 'a': if(! (file_action = strdup(optarg) )){
err_exit("Out of memory");
}
break;
// Print byte statistics
case 'b': stats = atoi(optarg);
break;
// default case
default: usage();
break;
}
}
// Read number of proxy from file
N_proxies = read_proxy_count(filename);
experiment_info->num_proxies = N_proxies - 1;
// Check that input parameters are correct
#ifdef DEBUG
printf("[DEBUG] Parameters count: %d\n", argc);
#endif
if (argc == 1){
usage();
}
if ((strcmp(proto, "spp") == 0) && slices_len < 1){
printf("No. of slices need to be > 0");
usage();
}
if (action < 1 || action > 4){
usage();
}
if ((strcmp(proto, "spp") != 0) && (strcmp(proto, "ssl") != 0) && (strcmp(proto, "pln") != 0)){
printf("Protocol type specified (%s) is not supported. Supported protocols are: spp, ssl, pln\n", proto);
usage();
}
if (N_proxies == 0){
printf ("At least one proxy needs to be defined, i.e., the final server\n");
usage();
}
if (r > N_proxies || w > N_proxies){
printf ("The values for r and w need to be <= than the number of proxies\n");
usage();
}
if(action == 4){
if (file_action == NULL){
printf ("Action file (-a path_to_file) is required with -o 4\n");
usage();
}else{
FILE *fp;
fp = fopen(file_action,"r");
int ch=0;
// Check for errors while opening file
if(fp == NULL){
printf("Error while opening file %s.\r\n", file_action);
exit(-1);
}
while( ! feof(fp)){
ch = fgetc(fp);
if(ch == '\n'){
lines++;
}
}
fclose(fp);
}
}
// Generate a clientID
time_t t;
srand((unsigned) time(&t));
clientID = rand() % MAX_CONC_CLIENT;
// Construct string for client/server behavior
char *temp_str;
if (action == 1){
temp_str = "handshake_only";
}
if (action == 2){
temp_str = "200_OK";
}
if (action == 3){
temp_str = "serve_file";
}
if (action == 4){
temp_str = "browser_like";
}
// Logging input parameters
#ifdef DEBUG
printf("[DEBUG] CLIENT-ID=%d host=%s port=%d slices=%d read=%d write=%d n_proxies=%d proto=%s action=%d(%s)\n", clientID, host, port, slices_len, r, w, N_proxies, proto, action, temp_str);
#endif
// Build SSL context
ctx = initialize_ctx(KEYFILE, PASSWORD, proto);
ssl = SSL_new(ctx);
// Allocate memory for proxies
proxies = malloc( N_proxies * sizeof (SPP_PROXY*));
// Read proxy list
read_proxy_list(filename, proxies);
// Print proxy list
#ifdef DEBUG
print_proxy_list(proxies, N_proxies);
#endif
// Start timer for SPP (do not count slice creation for SSL instead)
if (strcmp(proto, "spp") == 0){
gettimeofday(&tvBegin, NULL);
}
// Create slices_n slices with incremental purpose
slice_set = malloc( slices_len * sizeof (SPP_SLICE*));
#ifdef DEBUG
printf("[DEBUG] Generating %d slices\n", slices_len);
#endif
int i;
for (i = 0; i < slices_len; i++){
char *newPurpose;
char str[30];
sprintf (str, "slices_%d", (i + 2));
newPurpose = (char *)malloc(strlen(str)+1);
strcpy(newPurpose, str);
slice_set[i] = SPP_generate_slice(ssl, newPurpose);
#ifdef DEBUG
printf("\t[DEBUG] Generated slices %d with purpose %s\n", slice_set[i]->slice_id, slice_set[i]->purpose);
#endif
}
// Assign write access to proxies for all slices
// Find MAX between r and w
int MAX = r;
if (w > r)
MAX = w;
// Iterate among proxies
for (i = 0; i < MAX ; i++){
// assign read access if requested
if (i < r){
if (SPP_assign_proxy_read_slices(ssl, proxies[i], slice_set, slices_len) == 1 ) {
#ifdef DEBUG
printf ("[DEBUG] Proxy %s assigned read access to slice-set (READ_COUNT=%d)\n", proxies[i]->address, (i + 1));
#endif
}
}
// assign write access if requested
if (i < w){
if (SPP_assign_proxy_write_slices(ssl, proxies[i], slice_set, slices_len) == 1 ) {
#ifdef DEBUG
printf ("Proxy %s correctly assigned write access to slice-set (WRITE COUNT=%d)\n", proxies[i]->address, (i + 1));
#endif
}
}
}
// Start timer for "ssl" and "pln"
if (strcmp(proto, "ssl") == 0 || strcmp(proto, "pln") == 0){
gettimeofday(&tvBegin, NULL);
}
// TCP Connect
char* address = (char*)malloc(strlen(proxies[0]->address) + 1); // Large enough for string+\0
memcpy(address, proxies[0]->address, strlen(proxies[0]->address) + 1);
host = strtok(address, ":");
port = atoi(strtok(NULL, ":"));
#ifdef DEBUG
printf("[DEBUG] Opening socket to host: %s, port %d\n", host, port);
#endif
sock = tcp_connect(host, port);
plain_socket = sock;
// Connect TCP socket to SSL socket
// don't init ssl for unencrypted data...
if (strcmp(proto, "pln") != 0)
{
sbio = BIO_new_socket(sock, BIO_NOCLOSE);
SSL_set_bio(ssl, sbio, sbio);
}
// SSL Connect
gettimeofday(&tvBeginConnect, NULL);
if (strcmp(proto, "pln") != 0){
doConnect (proto, slices_len, N_proxies, slice_set, proxies);
}
// Measure duration of "ssl"/"spp" connect (it does not apply to "pln" of course)
gettimeofday(&tvEndConnect, NULL);
timeval_subtract(&tvConnect, &tvEndConnect, &tvBegin);
// Switch across possible client-server behavior
// // NOTE: here we can add more complex strategies
switch(action){
// Handshake only
case 1: break;
// Send simple request, wait for 200 OK
case 2: http_request(file_requested, proto, false, &tvEnd);
break;
// Send HTTP GET request and wait for file to be received
case 3: http_request(file_requested, proto, true, &tvEnd);
break;
// Send several GET request following a browser-like behavior
case 4: http_complex(proto, file_action, &tvEnd);
break;
// Unknown option
default: usage();
break;
}
// Compute duration of action
if (action > 1){
timeval_subtract(&tvDuration, &tvEnd, &tvBegin);
}
// Remove SSL context
destroy_ctx(ctx);
// Clode socket
close(sock);
//Free memory
#ifdef DEBUG
printf("[DEBUG] Freeing memory\n");
#endif
for (i = 0; i < N_proxies ; i++){
free(proxies[i]);
}
for (i = 0; i < slices_len; i++){
free(slice_set[i]);
}
free(proxies);
free(slice_set);
free(experiment_info);
// Report time statistics
if (action > 1){
printf("[RESULTS] No_Slices %d Action %s_%d Duration %ld.%06ld\n", slices_len, temp_str, sizeCheck, tvDuration.tv_sec, tvDuration.tv_usec);
}else{
printf("[RESULTS] No_Slices %d Action %s Handshake_Dur %ld.%06ld\n", slices_len, temp_str, tvConnect.tv_sec, tvConnect.tv_usec);
}
// All good
return 0;
}