-
Notifications
You must be signed in to change notification settings - Fork 881
/
ndpiSimpleIntegration.c
1194 lines (1032 loc) · 37.9 KB
/
ndpiSimpleIntegration.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
/*
*
* Copyright (C) 2011-22 - ntop.org
*
* nDPI is free software: you can redistribute it and/or modify
* it under the terms of the GNU Lesser General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
*
* nDPI 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 Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public License
* along with nDPI. If not, see <http://www.gnu.org/licenses/>.
*
*/
#ifndef WIN32
#include <arpa/inet.h>
#include <netinet/in.h>
#endif
#include <errno.h>
#include <ndpi_api.h>
#include <ndpi_main.h>
#include <ndpi_typedefs.h>
#include <pcap/pcap.h>
#include <pthread.h>
#include <signal.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#ifdef WIN32
#include <windows.h>
#endif
//#define VERBOSE 1
#define MAX_FLOW_ROOTS_PER_THREAD 2048
#define MAX_IDLE_FLOWS_PER_THREAD 64
#define TICK_RESOLUTION 1000
#define MAX_READER_THREADS 4
#define IDLE_SCAN_PERIOD 10000 /* msec */
#define MAX_IDLE_TIME 300000 /* msec */
#define INITIAL_THREAD_HASH 0x03dd018b
#ifndef ETH_P_IP
#define ETH_P_IP 0x0800
#endif
#ifndef ETH_P_IPV6
#define ETH_P_IPV6 0x86DD
#endif
#ifndef ETH_P_ARP
#define ETH_P_ARP 0x0806
#endif
enum nDPI_l3_type {
L3_IP, L3_IP6
};
struct nDPI_flow_info {
uint32_t flow_id;
unsigned long long int packets_processed;
uint64_t first_seen;
uint64_t last_seen;
uint64_t hashval;
enum nDPI_l3_type l3_type;
union {
struct {
uint32_t src;
uint32_t pad_00[3];
uint32_t dst;
uint32_t pad_01[3];
} v4;
struct {
uint64_t src[2];
uint64_t dst[2];
} v6;
struct {
uint32_t src[4];
uint32_t dst[4];
} u32;
} ip_tuple;
unsigned long long int total_l4_data_len;
uint16_t src_port;
uint16_t dst_port;
uint8_t is_midstream_flow:1;
uint8_t flow_fin_ack_seen:1;
uint8_t flow_ack_seen:1;
uint8_t detection_completed:1;
uint8_t tls_client_hello_seen:1;
uint8_t tls_server_hello_seen:1;
uint8_t flow_info_printed:1;
uint8_t reserved_00:1;
uint8_t l4_protocol;
struct ndpi_proto detected_l7_protocol;
struct ndpi_proto guessed_protocol;
struct ndpi_flow_struct * ndpi_flow;
};
struct nDPI_workflow {
pcap_t * pcap_handle;
volatile long int error_or_eof;
unsigned long long int packets_captured;
unsigned long long int packets_processed;
unsigned long long int total_l4_data_len;
unsigned long long int detected_flow_protocols;
uint64_t last_idle_scan_time;
uint64_t last_time;
void ** ndpi_flows_active;
unsigned long long int max_active_flows;
unsigned long long int cur_active_flows;
unsigned long long int total_active_flows;
void ** ndpi_flows_idle;
unsigned long long int max_idle_flows;
unsigned long long int cur_idle_flows;
unsigned long long int total_idle_flows;
struct ndpi_detection_module_struct * ndpi_struct;
};
struct nDPI_reader_thread {
struct nDPI_workflow * workflow;
pthread_t thread_id;
uint32_t array_index;
};
static struct nDPI_reader_thread reader_threads[MAX_READER_THREADS] = {};
static int reader_thread_count = MAX_READER_THREADS;
static volatile long int main_thread_shutdown = 0;
static volatile long int flow_id = 0;
static void free_workflow(struct nDPI_workflow ** const workflow);
static struct nDPI_workflow * init_workflow(char const * const file_or_device)
{
char pcap_error_buffer[PCAP_ERRBUF_SIZE];
struct nDPI_workflow * workflow = (struct nDPI_workflow *)ndpi_calloc(1, sizeof(*workflow));
const char *bpfFilter = "ip or ip6";
static struct bpf_program bpf_code;
static struct bpf_program *bpf_cfilter = NULL;
if (workflow == NULL) {
return NULL;
}
if (access(file_or_device, R_OK) != 0 && errno == ENOENT) {
workflow->pcap_handle = pcap_open_live(file_or_device, /* 1536 */ 65535, 1, 250, pcap_error_buffer);
} else {
#ifdef WIN32
workflow->pcap_handle = pcap_open_offline(file_or_device, pcap_error_buffer);
#else
workflow->pcap_handle = pcap_open_offline_with_tstamp_precision(file_or_device, PCAP_TSTAMP_PRECISION_MICRO,
pcap_error_buffer);
#endif
}
if (workflow->pcap_handle == NULL) {
fprintf(stderr, "pcap_open_live / pcap_open_offline: %.*s\n",
(int) PCAP_ERRBUF_SIZE, pcap_error_buffer);
free_workflow(&workflow);
return NULL;
}
if(pcap_compile(workflow->pcap_handle, &bpf_code, bpfFilter, 1, 0xFFFFFF00) < 0) {
printf("pcap_compile error: '%s'\n", pcap_geterr(workflow->pcap_handle));
exit(-1);
}
bpf_cfilter = &bpf_code;
if(pcap_setfilter(workflow->pcap_handle, bpf_cfilter) < 0) {
printf("pcap_setfilter error: '%s'\n", pcap_geterr(workflow->pcap_handle));
}
workflow->ndpi_struct = ndpi_init_detection_module(NULL);
if (workflow->ndpi_struct == NULL) {
free_workflow(&workflow);
return NULL;
}
workflow->total_active_flows = 0;
workflow->max_active_flows = MAX_FLOW_ROOTS_PER_THREAD;
workflow->ndpi_flows_active = (void **)ndpi_calloc(workflow->max_active_flows, sizeof(void *));
if (workflow->ndpi_flows_active == NULL) {
free_workflow(&workflow);
return NULL;
}
workflow->total_idle_flows = 0;
workflow->max_idle_flows = MAX_IDLE_FLOWS_PER_THREAD;
workflow->ndpi_flows_idle = (void **)ndpi_calloc(workflow->max_idle_flows, sizeof(void *));
if (workflow->ndpi_flows_idle == NULL) {
free_workflow(&workflow);
return NULL;
}
NDPI_PROTOCOL_BITMASK protos;
NDPI_BITMASK_SET_ALL(protos);
ndpi_set_protocol_detection_bitmask2(workflow->ndpi_struct, &protos);
ndpi_finalize_initialization(workflow->ndpi_struct);
return workflow;
}
static void ndpi_flow_info_freer(void * const node)
{
struct nDPI_flow_info * const flow = (struct nDPI_flow_info *)node;
ndpi_flow_free(flow->ndpi_flow);
ndpi_free(flow);
}
static void free_workflow(struct nDPI_workflow ** const workflow)
{
struct nDPI_workflow * const w = *workflow;
size_t i;
if (w == NULL) {
return;
}
if (w->pcap_handle != NULL) {
pcap_close(w->pcap_handle);
w->pcap_handle = NULL;
}
if (w->ndpi_struct != NULL) {
ndpi_exit_detection_module(w->ndpi_struct);
}
for(i = 0; i < w->max_active_flows; i++) {
ndpi_tdestroy(w->ndpi_flows_active[i], ndpi_flow_info_freer);
}
ndpi_free(w->ndpi_flows_active);
ndpi_free(w->ndpi_flows_idle);
ndpi_free(w);
*workflow = NULL;
}
static char * get_default_pcapdev(char *errbuf)
{
char * ifname;
pcap_if_t * all_devices = NULL;
if (pcap_findalldevs(&all_devices, errbuf) != 0)
{
return NULL;
}
ifname = strdup(all_devices[0].name);
pcap_freealldevs(all_devices);
return ifname;
}
static int setup_reader_threads(char const * const file_or_device)
{
char * file_or_default_device;
char pcap_error_buffer[PCAP_ERRBUF_SIZE];
int i;
if (reader_thread_count > MAX_READER_THREADS) {
return 1;
}
if (file_or_device == NULL) {
file_or_default_device = get_default_pcapdev(pcap_error_buffer);
if (file_or_default_device == NULL) {
fprintf(stderr, "pcap_findalldevs: %.*s\n", (int) PCAP_ERRBUF_SIZE, pcap_error_buffer);
return 1;
}
} else {
file_or_default_device = strdup(file_or_device);
if (file_or_default_device == NULL) {
return 1;
}
}
for (i = 0; i < reader_thread_count; ++i) {
reader_threads[i].workflow = init_workflow(file_or_default_device);
if (reader_threads[i].workflow == NULL)
{
free(file_or_default_device);
return 1;
}
}
free(file_or_default_device);
return 0;
}
static int ip_tuple_to_string(struct nDPI_flow_info const * const flow,
char * const src_addr_str, size_t src_addr_len,
char * const dst_addr_str, size_t dst_addr_len)
{
switch (flow->l3_type) {
case L3_IP:
return inet_ntop(AF_INET, (struct sockaddr_in *)&flow->ip_tuple.v4.src,
src_addr_str, src_addr_len) != NULL &&
inet_ntop(AF_INET, (struct sockaddr_in *)&flow->ip_tuple.v4.dst,
dst_addr_str, dst_addr_len) != NULL;
case L3_IP6:
return inet_ntop(AF_INET6, (struct sockaddr_in6 *)&flow->ip_tuple.v6.src[0],
src_addr_str, src_addr_len) != NULL &&
inet_ntop(AF_INET6, (struct sockaddr_in6 *)&flow->ip_tuple.v6.dst[0],
dst_addr_str, dst_addr_len) != NULL;
}
return 0;
}
#ifdef VERBOSE
static void print_packet_info(struct nDPI_reader_thread const * const reader_thread,
struct pcap_pkthdr const * const header,
uint32_t l4_data_len,
struct nDPI_flow_info const * const flow)
{
struct nDPI_workflow const * const workflow = reader_thread->workflow;
char src_addr_str[INET6_ADDRSTRLEN+1] = {0};
char dst_addr_str[INET6_ADDRSTRLEN+1] = {0};
char buf[256];
int used = 0, ret;
ret = ndpi_snprintf(buf, sizeof(buf), "[%8llu, %d, %4u] %4u bytes: ",
workflow->packets_captured, reader_thread->array_index,
flow->flow_id, header->caplen);
if (ret > 0) {
used += ret;
}
if (ip_tuple_to_string(flow, src_addr_str, sizeof(src_addr_str), dst_addr_str, sizeof(dst_addr_str)) != 0) {
ret = ndpi_snprintf(buf + used, sizeof(buf) - used, "IP[%s -> %s]", src_addr_str, dst_addr_str);
} else {
ret = ndpi_snprintf(buf + used, sizeof(buf) - used, "IP[ERROR]");
}
if (ret > 0) {
used += ret;
}
switch (flow->l4_protocol) {
case IPPROTO_UDP:
ret = ndpi_snprintf(buf + used, sizeof(buf) - used, " -> UDP[%u -> %u, %u bytes]",
flow->src_port, flow->dst_port, l4_data_len);
break;
case IPPROTO_TCP:
ret = ndpi_snprintf(buf + used, sizeof(buf) - used, " -> TCP[%u -> %u, %u bytes]",
flow->src_port, flow->dst_port, l4_data_len);
break;
case IPPROTO_ICMP:
ret = ndpi_snprintf(buf + used, sizeof(buf) - used, " -> ICMP");
break;
case IPPROTO_ICMPV6:
ret = ndpi_snprintf(buf + used, sizeof(buf) - used, " -> ICMP6");
break;
case IPPROTO_HOPOPTS:
ret = ndpi_snprintf(buf + used, sizeof(buf) - used, " -> ICMP6 Hop-By-Hop");
break;
default:
ret = ndpi_snprintf(buf + used, sizeof(buf) - used, " -> Unknown[0x%X]", flow->l4_protocol);
break;
}
if (ret > 0) {
used += ret;
}
printf("%.*s\n", used, buf);
}
#endif
static int ip_tuples_compare(struct nDPI_flow_info const * const A, struct nDPI_flow_info const * const B)
{
// generate a warning if the enum changes
switch (A->l3_type)
{
case L3_IP:
case L3_IP6:
break;
}
if (A->l3_type == L3_IP && B->l3_type == L3_IP)
{
if (A->ip_tuple.v4.src < B->ip_tuple.v4.src)
{
return -1;
}
if (A->ip_tuple.v4.src > B->ip_tuple.v4.src)
{
return 1;
}
if (A->ip_tuple.v4.dst < B->ip_tuple.v4.dst)
{
return -1;
}
if (A->ip_tuple.v4.dst > B->ip_tuple.v4.dst)
{
return 1;
}
}
else if (A->l3_type == L3_IP6 && B->l3_type == L3_IP6)
{
if (A->ip_tuple.v6.src[0] < B->ip_tuple.v6.src[0] && A->ip_tuple.v6.src[1] < B->ip_tuple.v6.src[1])
{
return -1;
}
if (A->ip_tuple.v6.src[0] > B->ip_tuple.v6.src[0] && A->ip_tuple.v6.src[1] > B->ip_tuple.v6.src[1])
{
return 1;
}
if (A->ip_tuple.v6.dst[0] < B->ip_tuple.v6.dst[0] && A->ip_tuple.v6.dst[1] < B->ip_tuple.v6.dst[1])
{
return -1;
}
if (A->ip_tuple.v6.dst[0] > B->ip_tuple.v6.dst[0] && A->ip_tuple.v6.dst[1] > B->ip_tuple.v6.dst[1])
{
return 1;
}
}
if (A->src_port < B->src_port)
{
return -1;
}
if (A->src_port > B->src_port)
{
return 1;
}
if (A->dst_port < B->dst_port)
{
return -1;
}
if (A->dst_port > B->dst_port)
{
return 1;
}
return 0;
}
static void ndpi_idle_scan_walker(void const * const A, ndpi_VISIT which, int depth, void * const user_data)
{
struct nDPI_workflow * const workflow = (struct nDPI_workflow *)user_data;
struct nDPI_flow_info * const flow = *(struct nDPI_flow_info **)A;
(void)depth;
if (workflow == NULL || flow == NULL) {
return;
}
if (workflow->cur_idle_flows == MAX_IDLE_FLOWS_PER_THREAD) {
return;
}
if (which == ndpi_preorder || which == ndpi_leaf) {
if ((flow->flow_fin_ack_seen == 1 && flow->flow_ack_seen == 1) ||
flow->last_seen + MAX_IDLE_TIME < workflow->last_time)
{
char src_addr_str[INET6_ADDRSTRLEN+1];
char dst_addr_str[INET6_ADDRSTRLEN+1];
ip_tuple_to_string(flow, src_addr_str, sizeof(src_addr_str), dst_addr_str, sizeof(dst_addr_str));
workflow->ndpi_flows_idle[workflow->cur_idle_flows++] = flow;
workflow->total_idle_flows++;
}
}
}
static int ndpi_workflow_node_cmp(void const * const A, void const * const B) {
struct nDPI_flow_info const * const flow_info_a = (struct nDPI_flow_info *)A;
struct nDPI_flow_info const * const flow_info_b = (struct nDPI_flow_info *)B;
if (flow_info_a->hashval < flow_info_b->hashval) {
return(-1);
} else if (flow_info_a->hashval > flow_info_b->hashval) {
return(1);
}
/* Flows have the same hash */
if (flow_info_a->l4_protocol < flow_info_b->l4_protocol) {
return(-1);
} else if (flow_info_a->l4_protocol > flow_info_b->l4_protocol) {
return(1);
}
return ip_tuples_compare(flow_info_a, flow_info_b);
}
static void check_for_idle_flows(struct nDPI_workflow * const workflow)
{
size_t idle_scan_index;
if (workflow->last_idle_scan_time + IDLE_SCAN_PERIOD < workflow->last_time) {
for (idle_scan_index = 0; idle_scan_index < workflow->max_active_flows; ++idle_scan_index) {
ndpi_twalk(workflow->ndpi_flows_active[idle_scan_index], ndpi_idle_scan_walker, workflow);
while (workflow->cur_idle_flows > 0) {
struct nDPI_flow_info * const f =
(struct nDPI_flow_info *)workflow->ndpi_flows_idle[--workflow->cur_idle_flows];
if (f->flow_fin_ack_seen == 1) {
printf("Free fin flow with id %u\n", f->flow_id);
} else {
printf("Free idle flow with id %u\n", f->flow_id);
}
ndpi_tdelete(f, &workflow->ndpi_flows_active[idle_scan_index],
ndpi_workflow_node_cmp);
ndpi_flow_info_freer(f);
workflow->cur_active_flows--;
}
}
workflow->last_idle_scan_time = workflow->last_time;
}
}
static void ndpi_process_packet(uint8_t * const args,
struct pcap_pkthdr const * const header,
uint8_t const * const packet)
{
struct nDPI_reader_thread * const reader_thread =
(struct nDPI_reader_thread *)args;
struct nDPI_workflow * workflow;
struct nDPI_flow_info flow;
size_t hashed_index;
void * tree_result;
struct nDPI_flow_info * flow_to_process;
const struct ndpi_ethhdr * ethernet;
const struct ndpi_iphdr * ip;
struct ndpi_ipv6hdr * ip6;
uint64_t time_ms;
const uint16_t eth_offset = 0;
uint16_t ip_offset;
uint16_t ip_size;
const uint8_t * l4_ptr = NULL;
uint16_t l4_len = 0;
uint16_t type;
uint32_t thread_index = INITIAL_THREAD_HASH; // generated with `dd if=/dev/random bs=1024 count=1 |& hd'
memset(&flow, '\0', sizeof(flow));
if (reader_thread == NULL) {
return;
}
workflow = reader_thread->workflow;
if (workflow == NULL) {
return;
}
workflow->packets_captured++;
time_ms = ((uint64_t) header->ts.tv_sec) * TICK_RESOLUTION + header->ts.tv_usec / (1000000 / TICK_RESOLUTION);
workflow->last_time = time_ms;
check_for_idle_flows(workflow);
/* process datalink layer */
switch (pcap_datalink(workflow->pcap_handle)) {
case DLT_NULL:
if (ntohl(*((uint32_t *)&packet[eth_offset])) == 0x00000002) {
type = ETH_P_IP;
} else {
type = ETH_P_IPV6;
}
ip_offset = 4 + eth_offset;
break;
case DLT_EN10MB:
if (header->len < sizeof(struct ndpi_ethhdr)) {
fprintf(stderr, "[%8llu, %d] Ethernet packet too short - skipping\n",
workflow->packets_captured, reader_thread->array_index);
return;
}
ethernet = (struct ndpi_ethhdr *) &packet[eth_offset];
ip_offset = sizeof(struct ndpi_ethhdr) + eth_offset;
type = ntohs(ethernet->h_proto);
switch (type) {
case ETH_P_IP: /* IPv4 */
if (header->len < sizeof(struct ndpi_ethhdr) + sizeof(struct ndpi_iphdr)) {
fprintf(stderr, "[%8llu, %d] IP packet too short - skipping\n",
workflow->packets_captured, reader_thread->array_index);
return;
}
break;
case ETH_P_IPV6: /* IPV6 */
if (header->len < sizeof(struct ndpi_ethhdr) + sizeof(struct ndpi_ipv6hdr)) {
fprintf(stderr, "[%8llu, %d] IP6 packet too short - skipping\n",
workflow->packets_captured, reader_thread->array_index);
return;
}
break;
case ETH_P_ARP: /* ARP */
return;
default:
fprintf(stderr, "[%8llu, %d] Unknown Ethernet packet with type 0x%X - skipping\n",
workflow->packets_captured, reader_thread->array_index, type);
return;
}
break;
default:
fprintf(stderr, "[%8llu, %d] Captured non IP/Ethernet packet with datalink type 0x%X - skipping\n",
workflow->packets_captured, reader_thread->array_index, pcap_datalink(workflow->pcap_handle));
return;
}
if (type == ETH_P_IP) {
ip = (struct ndpi_iphdr *)&packet[ip_offset];
ip6 = NULL;
} else if (type == ETH_P_IPV6) {
ip = NULL;
ip6 = (struct ndpi_ipv6hdr *)&packet[ip_offset];
} else {
fprintf(stderr, "[%8llu, %d] Captured non IPv4/IPv6 packet with type 0x%X - skipping\n",
workflow->packets_captured, reader_thread->array_index, type);
return;
}
ip_size = header->len - ip_offset;
if (type == ETH_P_IP && header->len >= ip_offset) {
if (header->caplen < header->len) {
fprintf(stderr, "[%8llu, %d] Captured packet size is smaller than packet size: %u < %u\n",
workflow->packets_captured, reader_thread->array_index, header->caplen, header->len);
}
}
/* process layer3 e.g. IPv4 / IPv6 */
if (ip != NULL && ip->version == 4) {
if (ip_size < sizeof(*ip)) {
fprintf(stderr, "[%8llu, %d] Packet smaller than IP4 header length: %u < %zu\n",
workflow->packets_captured, reader_thread->array_index, ip_size, sizeof(*ip));
return;
}
flow.l3_type = L3_IP;
if (ndpi_detection_get_l4((uint8_t*)ip, ip_size, &l4_ptr, &l4_len,
&flow.l4_protocol, NDPI_DETECTION_ONLY_IPV4) != 0)
{
fprintf(stderr, "[%8llu, %d] nDPI IPv4/L4 payload detection failed, L4 length: %zu\n",
workflow->packets_captured, reader_thread->array_index, ip_size - sizeof(*ip));
return;
}
flow.ip_tuple.v4.src = ip->saddr;
flow.ip_tuple.v4.dst = ip->daddr;
uint32_t min_addr = (flow.ip_tuple.v4.src > flow.ip_tuple.v4.dst ?
flow.ip_tuple.v4.dst : flow.ip_tuple.v4.src);
thread_index = min_addr + ip->protocol;
} else if (ip6 != NULL) {
if (ip_size < sizeof(ip6->ip6_hdr)) {
fprintf(stderr, "[%8llu, %d] Packet smaller than IP6 header length: %u < %zu\n",
workflow->packets_captured, reader_thread->array_index, ip_size, sizeof(ip6->ip6_hdr));
return;
}
flow.l3_type = L3_IP6;
if (ndpi_detection_get_l4((uint8_t*)ip6, ip_size, &l4_ptr, &l4_len,
&flow.l4_protocol, NDPI_DETECTION_ONLY_IPV6) != 0)
{
fprintf(stderr, "[%8llu, %d] nDPI IPv6/L4 payload detection failed, L4 length: %zu\n",
workflow->packets_captured, reader_thread->array_index, ip_size - sizeof(*ip6));
return;
}
flow.ip_tuple.v6.src[0] = ip6->ip6_src.u6_addr.u6_addr64[0];
flow.ip_tuple.v6.src[1] = ip6->ip6_src.u6_addr.u6_addr64[1];
flow.ip_tuple.v6.dst[0] = ip6->ip6_dst.u6_addr.u6_addr64[0];
flow.ip_tuple.v6.dst[1] = ip6->ip6_dst.u6_addr.u6_addr64[1];
uint64_t min_addr[2];
if (flow.ip_tuple.v6.src[0] > flow.ip_tuple.v6.dst[0] &&
flow.ip_tuple.v6.src[1] > flow.ip_tuple.v6.dst[1])
{
min_addr[0] = flow.ip_tuple.v6.dst[0];
min_addr[1] = flow.ip_tuple.v6.dst[0];
} else {
min_addr[0] = flow.ip_tuple.v6.src[0];
min_addr[1] = flow.ip_tuple.v6.src[0];
}
thread_index = min_addr[0] + min_addr[1] + ip6->ip6_hdr.ip6_un1_nxt;
} else {
fprintf(stderr, "[%8llu, %d] Non IP/IPv6 protocol detected: 0x%X\n",
workflow->packets_captured, reader_thread->array_index, type);
return;
}
/* process layer4 e.g. TCP / UDP */
if (flow.l4_protocol == IPPROTO_TCP) {
const struct ndpi_tcphdr * tcp;
if (header->len < (l4_ptr - packet) + sizeof(struct ndpi_tcphdr)) {
fprintf(stderr, "[%8llu, %d] Malformed TCP packet, packet size smaller than expected: %u < %zu\n",
workflow->packets_captured, reader_thread->array_index,
header->len, (l4_ptr - packet) + sizeof(struct ndpi_tcphdr));
return;
}
tcp = (struct ndpi_tcphdr *)l4_ptr;
flow.is_midstream_flow = (tcp->syn == 0 ? 1 : 0);
flow.flow_fin_ack_seen = (tcp->fin == 1 && tcp->ack == 1 ? 1 : 0);
flow.flow_ack_seen = tcp->ack;
flow.src_port = ntohs(tcp->source);
flow.dst_port = ntohs(tcp->dest);
} else if (flow.l4_protocol == IPPROTO_UDP) {
const struct ndpi_udphdr * udp;
if (header->len < (l4_ptr - packet) + sizeof(struct ndpi_udphdr)) {
fprintf(stderr, "[%8llu, %d] Malformed UDP packet, packet size smaller than expected: %u < %zu\n",
workflow->packets_captured, reader_thread->array_index,
header->len, (l4_ptr - packet) + sizeof(struct ndpi_udphdr));
return;
}
udp = (struct ndpi_udphdr *)l4_ptr;
flow.src_port = ntohs(udp->source);
flow.dst_port = ntohs(udp->dest);
}
/* distribute flows to threads while keeping stability (same flow goes always to same thread) */
thread_index += (flow.src_port < flow.dst_port ? flow.dst_port : flow.src_port);
thread_index %= reader_thread_count;
if (thread_index != reader_thread->array_index) {
return;
}
workflow->packets_processed++;
workflow->total_l4_data_len += l4_len;
#ifdef VERBOSE
print_packet_info(reader_thread, header, l4_len, &flow);
#endif
{
uint64_t tmp[4] = {};
/* calculate flow hash for btree find, search(insert) */
if (flow.l3_type == L3_IP) {
if (ndpi_flowv4_flow_hash(flow.l4_protocol, flow.ip_tuple.v4.src, flow.ip_tuple.v4.dst,
flow.src_port, flow.dst_port, 0, 0,
(uint8_t *)&tmp[0], sizeof(tmp)) != 0)
{
flow.hashval = flow.ip_tuple.v4.src + flow.ip_tuple.v4.dst; // fallback
} else {
flow.hashval = tmp[0] + tmp[1] + tmp[2] + tmp[3];
}
} else if (flow.l3_type == L3_IP6) {
if (ndpi_flowv6_flow_hash(flow.l4_protocol, &ip6->ip6_src, &ip6->ip6_dst,
flow.src_port, flow.dst_port, 0, 0,
(uint8_t *)&tmp[0], sizeof(tmp)) != 0)
{
flow.hashval = flow.ip_tuple.v6.src[0] + flow.ip_tuple.v6.src[1];
flow.hashval += flow.ip_tuple.v6.dst[0] + flow.ip_tuple.v6.dst[1];
} else {
flow.hashval = tmp[0] + tmp[1] + tmp[2] + tmp[3];
}
}
flow.hashval += flow.l4_protocol + flow.src_port + flow.dst_port;
}
hashed_index = flow.hashval % workflow->max_active_flows;
tree_result = ndpi_tfind(&flow, &workflow->ndpi_flows_active[hashed_index], ndpi_workflow_node_cmp);
if (tree_result == NULL) {
/* flow not found in btree: switch src <-> dst and try to find it again */
uint32_t orig_src_ip[4] = { flow.ip_tuple.u32.src[0], flow.ip_tuple.u32.src[1],
flow.ip_tuple.u32.src[2], flow.ip_tuple.u32.src[3] };
uint32_t orig_dst_ip[4] = { flow.ip_tuple.u32.dst[0], flow.ip_tuple.u32.dst[1],
flow.ip_tuple.u32.dst[2], flow.ip_tuple.u32.dst[3] };
uint16_t orig_src_port = flow.src_port;
uint16_t orig_dst_port = flow.dst_port;
flow.ip_tuple.u32.src[0] = orig_dst_ip[0];
flow.ip_tuple.u32.src[1] = orig_dst_ip[1];
flow.ip_tuple.u32.src[2] = orig_dst_ip[2];
flow.ip_tuple.u32.src[3] = orig_dst_ip[3];
flow.ip_tuple.u32.dst[0] = orig_src_ip[0];
flow.ip_tuple.u32.dst[1] = orig_src_ip[1];
flow.ip_tuple.u32.dst[2] = orig_src_ip[2];
flow.ip_tuple.u32.dst[3] = orig_src_ip[3];
flow.src_port = orig_dst_port;
flow.dst_port = orig_src_port;
tree_result = ndpi_tfind(&flow, &workflow->ndpi_flows_active[hashed_index], ndpi_workflow_node_cmp);
flow.ip_tuple.u32.src[0] = orig_src_ip[0];
flow.ip_tuple.u32.src[1] = orig_src_ip[1];
flow.ip_tuple.u32.src[2] = orig_src_ip[2];
flow.ip_tuple.u32.src[3] = orig_src_ip[3];
flow.ip_tuple.u32.dst[0] = orig_dst_ip[0];
flow.ip_tuple.u32.dst[1] = orig_dst_ip[1];
flow.ip_tuple.u32.dst[2] = orig_dst_ip[2];
flow.ip_tuple.u32.dst[3] = orig_dst_ip[3];
flow.src_port = orig_src_port;
flow.dst_port = orig_dst_port;
}
if (tree_result == NULL) {
/* flow still not found, must be new */
if (workflow->cur_active_flows == workflow->max_active_flows) {
fprintf(stderr, "[%8llu, %d] max flows to track reached: %llu, idle: %llu\n",
workflow->packets_captured, reader_thread->array_index,
workflow->max_active_flows, workflow->cur_idle_flows);
return;
}
flow_to_process = (struct nDPI_flow_info *)ndpi_malloc(sizeof(*flow_to_process));
if (flow_to_process == NULL) {
fprintf(stderr, "[%8llu, %d] Not enough memory for flow info\n",
workflow->packets_captured, reader_thread->array_index);
return;
}
memcpy(flow_to_process, &flow, sizeof(*flow_to_process));
flow_to_process->flow_id = __sync_fetch_and_add(&flow_id, 1);
flow_to_process->ndpi_flow = (struct ndpi_flow_struct *)ndpi_flow_malloc(SIZEOF_FLOW_STRUCT);
if (flow_to_process->ndpi_flow == NULL) {
fprintf(stderr, "[%8llu, %d, %4u] Not enough memory for flow struct\n",
workflow->packets_captured, reader_thread->array_index, flow_to_process->flow_id);
return;
}
memset(flow_to_process->ndpi_flow, 0, SIZEOF_FLOW_STRUCT);
printf("[%8llu, %d, %4u] new %sflow\n", workflow->packets_captured, thread_index,
flow_to_process->flow_id,
(flow_to_process->is_midstream_flow != 0 ? "midstream-" : ""));
if (ndpi_tsearch(flow_to_process, &workflow->ndpi_flows_active[hashed_index], ndpi_workflow_node_cmp) == NULL) {
/* Possible Leak, but should not happen as we'd abort earlier. */
return;
}
workflow->cur_active_flows++;
workflow->total_active_flows++;
} else {
flow_to_process = *(struct nDPI_flow_info **)tree_result;
}
flow_to_process->packets_processed++;
flow_to_process->total_l4_data_len += l4_len;
/* update timestamps, important for timeout handling */
if (flow_to_process->first_seen == 0) {
flow_to_process->first_seen = time_ms;
}
flow_to_process->last_seen = time_ms;
/* current packet is an TCP-ACK? */
flow_to_process->flow_ack_seen = flow.flow_ack_seen;
/* TCP-FIN: indicates that at least one side wants to end the connection */
if (flow.flow_fin_ack_seen != 0 && flow_to_process->flow_fin_ack_seen == 0) {
flow_to_process->flow_fin_ack_seen = 1;
printf("[%8llu, %d, %4u] end of flow\n", workflow->packets_captured, thread_index,
flow_to_process->flow_id);
return;
}
/*
* This example tries to use maximum supported packets for detection:
* for uint8: 0xFF
*/
if (flow_to_process->ndpi_flow->num_processed_pkts == 0xFF) {
return;
} else if (flow_to_process->ndpi_flow->num_processed_pkts == 0xFE) {
/* last chance to guess something, better then nothing */
uint8_t protocol_was_guessed = 0;
flow_to_process->guessed_protocol =
ndpi_detection_giveup(workflow->ndpi_struct,
flow_to_process->ndpi_flow,
&protocol_was_guessed);
if (protocol_was_guessed != 0) {
printf("[%8llu, %d, %4d][GUESSED] protocol: %s | app protocol: %s | category: %s\n",
workflow->packets_captured,
reader_thread->array_index,
flow_to_process->flow_id,
ndpi_get_proto_name(workflow->ndpi_struct, flow_to_process->guessed_protocol.master_protocol),
ndpi_get_proto_name(workflow->ndpi_struct, flow_to_process->guessed_protocol.app_protocol),
ndpi_category_get_name(workflow->ndpi_struct, flow_to_process->guessed_protocol.category));
} else {
printf("[%8llu, %d, %4d][FLOW NOT CLASSIFIED]\n",
workflow->packets_captured, reader_thread->array_index, flow_to_process->flow_id);
}
}
flow_to_process->detected_l7_protocol =
ndpi_detection_process_packet(workflow->ndpi_struct, flow_to_process->ndpi_flow,
ip != NULL ? (uint8_t *)ip : (uint8_t *)ip6,
ip_size, time_ms, NULL);
if (ndpi_is_protocol_detected(flow_to_process->detected_l7_protocol) != 0 &&
flow_to_process->detection_completed == 0)
{
if (flow_to_process->detected_l7_protocol.master_protocol != NDPI_PROTOCOL_UNKNOWN ||
flow_to_process->detected_l7_protocol.app_protocol != NDPI_PROTOCOL_UNKNOWN)
{
flow_to_process->detection_completed = 1;
workflow->detected_flow_protocols++;
printf("[%8llu, %d, %4d][DETECTED] protocol: %s | app protocol: %s | category: %s\n",
workflow->packets_captured,
reader_thread->array_index,
flow_to_process->flow_id,
ndpi_get_proto_name(workflow->ndpi_struct, flow_to_process->detected_l7_protocol.master_protocol),
ndpi_get_proto_name(workflow->ndpi_struct, flow_to_process->detected_l7_protocol.app_protocol),
ndpi_category_get_name(workflow->ndpi_struct, flow_to_process->detected_l7_protocol.category));
}
}
if (flow_to_process->ndpi_flow->num_extra_packets_checked <=
flow_to_process->ndpi_flow->max_extra_packets_to_check)
{
/*
* Your business logic starts here.
*
* This example does print some information about
* TLS client and server hellos if available.
*
* You could also use nDPI's built-in json serialization
* and send it to a high-level application for further processing.
*
* EoE - End of Example
*/
if (flow_to_process->flow_info_printed == 0)
{
char const * const flow_info = ndpi_get_flow_info(flow_to_process->ndpi_flow, &flow_to_process->detected_l7_protocol);
if (flow_info != NULL)
{
printf("[%8llu, %d, %4d] info: %s\n",
workflow->packets_captured,
reader_thread->array_index,
flow_to_process->flow_id,
flow_info);
flow_to_process->flow_info_printed = 1;
}
}
if (flow_to_process->detected_l7_protocol.master_protocol == NDPI_PROTOCOL_TLS ||
flow_to_process->detected_l7_protocol.app_protocol == NDPI_PROTOCOL_TLS)
{
if (flow_to_process->tls_client_hello_seen == 0 &&
flow_to_process->ndpi_flow->protos.tls_quic.hello_processed != 0)
{
uint8_t unknown_tls_version = 0;
char buf_ver[16];
printf("[%8llu, %d, %4d][TLS-CLIENT-HELLO] version: %s | sni: %s | (advertised) ALPNs: %s\n",
workflow->packets_captured,
reader_thread->array_index,
flow_to_process->flow_id,
ndpi_ssl_version2str(buf_ver, sizeof(buf_ver),
flow_to_process->ndpi_flow->protos.tls_quic.ssl_version,
&unknown_tls_version),
flow_to_process->ndpi_flow->host_server_name,
(flow_to_process->ndpi_flow->protos.tls_quic.advertised_alpns != NULL ?
flow_to_process->ndpi_flow->protos.tls_quic.advertised_alpns : "-"));
flow_to_process->tls_client_hello_seen = 1;
}
if (flow_to_process->tls_server_hello_seen == 0 &&
flow_to_process->ndpi_flow->tls_quic.certificate_processed != 0)
{
uint8_t unknown_tls_version = 0;
char buf_ver[16];
printf("[%8llu, %d, %4d][TLS-SERVER-HELLO] version: %s | common-name(s): %.*s | "
"issuer: %s | subject: %s\n",
workflow->packets_captured,
reader_thread->array_index,
flow_to_process->flow_id,
ndpi_ssl_version2str(buf_ver, sizeof(buf_ver),
flow_to_process->ndpi_flow->protos.tls_quic.ssl_version,
&unknown_tls_version),
(flow_to_process->ndpi_flow->protos.tls_quic.server_names_len == 0 ?
1 : flow_to_process->ndpi_flow->protos.tls_quic.server_names_len),
(flow_to_process->ndpi_flow->protos.tls_quic.server_names == NULL ?
"-" : flow_to_process->ndpi_flow->protos.tls_quic.server_names),
(flow_to_process->ndpi_flow->protos.tls_quic.issuerDN != NULL ?
flow_to_process->ndpi_flow->protos.tls_quic.issuerDN : "-"),
(flow_to_process->ndpi_flow->protos.tls_quic.subjectDN != NULL ?
flow_to_process->ndpi_flow->protos.tls_quic.subjectDN : "-"));
flow_to_process->tls_server_hello_seen = 1;
}
}
}
}
static void run_pcap_loop(struct nDPI_reader_thread const * const reader_thread)
{
if (reader_thread->workflow != NULL &&