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pcap_mm: Mark unused parameters with __maybe_unused
[netsniff-ng.git] / netsniff-ng.c
blob7b08ed0e358fdb66108a7d5fa62bd847bb9cd65b
1 /*
2 * netsniff-ng - the packet sniffing beast
3 * Copyright 2009-2013 Daniel Borkmann.
4 * Copyright 2010 Emmanuel Roullit.
5 * Subject to the GPL, version 2.
6 */
7
8 #define _GNU_SOURCE
9 #include <stdio.h>
10 #include <stdlib.h>
11 #include <signal.h>
12 #include <getopt.h>
13 #include <ctype.h>
14 #include <time.h>
15 #include <string.h>
16 #include <sys/socket.h>
17 #include <sys/types.h>
18 #include <sys/stat.h>
19 #include <sys/time.h>
20 #include <sys/fsuid.h>
21 #include <unistd.h>
22 #include <stdbool.h>
23 #include <pthread.h>
24 #include <fcntl.h>
25
26 #include "ring_rx.h"
27 #include "ring_tx.h"
28 #include "mac80211.h"
29 #include "promisc.h"
30 #include "built_in.h"
31 #include "pcap_io.h"
32 #include "privs.h"
33 #include "proc.h"
34 #include "bpf.h"
35 #include "ioops.h"
36 #include "die.h"
37 #include "irq.h"
38 #include "str.h"
39 #include "sig.h"
40 #include "config.h"
41 #include "sock.h"
42 #include "geoip.h"
43 #include "lockme.h"
44 #include "tprintf.h"
45 #include "timer.h"
46 #include "tstamping.h"
47 #include "dissector.h"
48 #include "xmalloc.h"
49
50 enum dump_mode {
51 DUMP_INTERVAL_TIME,
52 DUMP_INTERVAL_SIZE,
53 };
54
55 struct ctx {
56 char *device_in, *device_out, *device_trans, *filter, *prefix;
57 int cpu, rfraw, dump, print_mode, dump_dir, packet_type, verbose;
58 unsigned long kpull, dump_interval, reserve_size, tx_bytes, tx_packets;
59 bool randomize, promiscuous, enforce, jumbo, dump_bpf;
60 enum pcap_ops_groups pcap; enum dump_mode dump_mode;
61 uid_t uid; gid_t gid; uint32_t link_type, magic;
62 };
63
64 static volatile sig_atomic_t sigint = 0;
65 static volatile bool next_dump = false;
66
67 static const char *short_options = "d:i:o:rf:MJt:S:k:n:b:HQmcsqXlvhF:RGAP:Vu:g:T:DBU";
68 static const struct option long_options[] = {
69 {"dev", required_argument, NULL, 'd'},
70 {"in", required_argument, NULL, 'i'},
71 {"out", required_argument, NULL, 'o'},
72 {"filter", required_argument, NULL, 'f'},
73 {"num", required_argument, NULL, 'n'},
74 {"type", required_argument, NULL, 't'},
75 {"interval", required_argument, NULL, 'F'},
76 {"ring-size", required_argument, NULL, 'S'},
77 {"kernel-pull", required_argument, NULL, 'k'},
78 {"bind-cpu", required_argument, NULL, 'b'},
79 {"prefix", required_argument, NULL, 'P'},
80 {"user", required_argument, NULL, 'u'},
81 {"group", required_argument, NULL, 'g'},
82 {"magic", required_argument, NULL, 'T'},
83 {"rand", no_argument, NULL, 'r'},
84 {"rfraw", no_argument, NULL, 'R'},
85 {"mmap", no_argument, NULL, 'm'},
86 {"sg", no_argument, NULL, 'G'},
87 {"clrw", no_argument, NULL, 'c'},
88 {"jumbo-support", no_argument, NULL, 'J'},
89 {"no-promisc", no_argument, NULL, 'M'},
90 {"prio-high", no_argument, NULL, 'H'},
91 {"notouch-irq", no_argument, NULL, 'Q'},
92 {"dump-pcap-types", no_argument, NULL, 'D'},
93 {"dump-bpf", no_argument, NULL, 'B'},
94 {"silent", no_argument, NULL, 's'},
95 {"less", no_argument, NULL, 'q'},
96 {"hex", no_argument, NULL, 'X'},
97 {"ascii", no_argument, NULL, 'l'},
98 {"no-sock-mem", no_argument, NULL, 'A'},
99 {"update", no_argument, NULL, 'U'},
100 {"verbose", no_argument, NULL, 'V'},
101 {"version", no_argument, NULL, 'v'},
102 {"help", no_argument, NULL, 'h'},
103 {NULL, 0, NULL, 0}
104 };
105
106 static int tx_sock;
107 static struct itimerval itimer;
108 static unsigned long frame_count_max = 0, interval = TX_KERNEL_PULL_INT;
109
110 #define __pcap_io pcap_ops[ctx->pcap]
111
112 static void signal_handler(int number)
113 {
114 switch (number) {
115 case SIGINT:
116 sigint = 1;
117 case SIGHUP:
118 default:
119 break;
120 }
121 }
122
123 static void timer_elapsed(int unused __maybe_unused)
124 {
125 int ret;
126
127 set_itimer_interval_value(&itimer, 0, interval);
128
129 ret = pull_and_flush_tx_ring(tx_sock);
130 if (unlikely(ret < 0)) {
131 /* We could hit EBADF if the socket has been closed before
132 * the timer was triggered.
133 */
134 if (errno != EBADF && errno != ENOBUFS)
135 panic("Flushing TX_RING failed: %s!\n", strerror(errno));
136 }
137
138 setitimer(ITIMER_REAL, &itimer, NULL);
139 }
140
141 static void timer_purge(void)
142 {
143 int ret;
144
145 ret = pull_and_flush_tx_ring_wait(tx_sock);
146 if (unlikely(ret < 0)) {
147 if (errno != EBADF && errno != ENOBUFS)
148 panic("Flushing TX_RING failed: %s!\n", strerror(errno));
149 }
150
151 set_itimer_interval_value(&itimer, 0, 0);
152 setitimer(ITIMER_REAL, &itimer, NULL);
153 }
154
155 static void timer_next_dump(int unused __maybe_unused)
156 {
157 set_itimer_interval_value(&itimer, interval, 0);
158 next_dump = true;
159 setitimer(ITIMER_REAL, &itimer, NULL);
160 }
161
162 static inline bool dump_to_pcap(struct ctx *ctx)
163 {
164 return ctx->dump;
165 }
166
167 static void pcap_to_xmit(struct ctx *ctx)
168 {
169 __label__ out;
170 uint8_t *out = NULL;
171 int irq, ifindex, fd = 0, ret;
172 unsigned int size, it = 0;
173 unsigned long trunced = 0;
174 struct ring tx_ring;
175 struct frame_map *hdr;
176 struct sock_fprog bpf_ops;
177 struct timeval start, end, diff;
178 pcap_pkthdr_t phdr;
179
180 if (!device_up_and_running(ctx->device_out) && !ctx->rfraw)
181 panic("Device not up and running!\n");
182
183 bug_on(!__pcap_io);
184
185 tx_sock = pf_socket();
186
187 if (!strncmp("-", ctx->device_in, strlen("-"))) {
188 fd = dup_or_die(fileno(stdin));
189 close(fileno(stdin));
190 if (ctx->pcap == PCAP_OPS_MM)
191 ctx->pcap = PCAP_OPS_SG;
192 } else {
193 fd = open_or_die(ctx->device_in, O_RDONLY | O_LARGEFILE | O_NOATIME);
194 }
195
196 if (__pcap_io->init_once_pcap)
197 __pcap_io->init_once_pcap();
198
199 ret = __pcap_io->pull_fhdr_pcap(fd, &ctx->magic, &ctx->link_type);
200 if (ret)
201 panic("Error reading pcap header!\n");
202
203 if (__pcap_io->prepare_access_pcap) {
204 ret = __pcap_io->prepare_access_pcap(fd, PCAP_MODE_RD, ctx->jumbo);
205 if (ret)
206 panic("Error prepare reading pcap!\n");
207 }
208
209 fmemset(&tx_ring, 0, sizeof(tx_ring));
210 fmemset(&bpf_ops, 0, sizeof(bpf_ops));
211
212 if (ctx->rfraw) {
213 ctx->device_trans = xstrdup(ctx->device_out);
214 xfree(ctx->device_out);
215
216 enter_rfmon_mac80211(ctx->device_trans, &ctx->device_out);
217 if (ctx->link_type != LINKTYPE_IEEE802_11)
218 panic("Wrong linktype of pcap!\n");
219 }
220
221 ifindex = device_ifindex(ctx->device_out);
222
223 size = ring_size(ctx->device_out, ctx->reserve_size);
224
225 bpf_parse_rules(ctx->filter, &bpf_ops, ctx->link_type);
226 if (ctx->dump_bpf)
227 bpf_dump_all(&bpf_ops);
228
229 set_packet_loss_discard(tx_sock);
230
231 setup_tx_ring_layout(tx_sock, &tx_ring, size, ctx->jumbo);
232 create_tx_ring(tx_sock, &tx_ring, ctx->verbose);
233 mmap_tx_ring(tx_sock, &tx_ring);
234 alloc_tx_ring_frames(tx_sock, &tx_ring);
235 bind_tx_ring(tx_sock, &tx_ring, ifindex);
236
237 dissector_init_all(ctx->print_mode);
238
239 if (ctx->cpu >= 0 && ifindex > 0) {
240 irq = device_irq_number(ctx->device_out);
241 device_set_irq_affinity(irq, ctx->cpu);
242
243 if (ctx->verbose)
244 printf("IRQ: %s:%d > CPU%d\n",
245 ctx->device_out, irq, ctx->cpu);
246 }
247
248 if (ctx->kpull)
249 interval = ctx->kpull;
250
251 set_itimer_interval_value(&itimer, 0, interval);
252 setitimer(ITIMER_REAL, &itimer, NULL);
253
254 drop_privileges(ctx->enforce, ctx->uid, ctx->gid);
255
256 printf("Running! Hang up with ^C!\n\n");
257 fflush(stdout);
258
259 bug_on(gettimeofday(&start, NULL));
260
261 while (likely(sigint == 0)) {
262 while (user_may_pull_from_tx(tx_ring.frames[it].iov_base)) {
263 hdr = tx_ring.frames[it].iov_base;
264 out = ((uint8_t *) hdr) + TPACKET2_HDRLEN - sizeof(struct sockaddr_ll);
265
266 do {
267 ret = __pcap_io->read_pcap(fd, &phdr, ctx->magic, out,
268 ring_frame_size(&tx_ring));
269 if (unlikely(ret <= 0))
270 goto out;
271
272 if (ring_frame_size(&tx_ring) <
273 pcap_get_length(&phdr, ctx->magic)) {
274 pcap_set_length(&phdr, ctx->magic,
275 ring_frame_size(&tx_ring));
276 trunced++;
277 }
278 } while (ctx->filter &&
279 !bpf_run_filter(&bpf_ops, out,
280 pcap_get_length(&phdr, ctx->magic)));
281
282 pcap_pkthdr_to_tpacket_hdr(&phdr, ctx->magic, &hdr->tp_h, &hdr->s_ll);
283
284 ctx->tx_bytes += hdr->tp_h.tp_len;;
285 ctx->tx_packets++;
286
287 show_frame_hdr(hdr, ctx->print_mode);
288
289 dissector_entry_point(out, hdr->tp_h.tp_snaplen,
290 ctx->link_type, ctx->print_mode);
291
292 kernel_may_pull_from_tx(&hdr->tp_h);
293
294 it++;
295 if (it >= tx_ring.layout.tp_frame_nr)
296 it = 0;
297
298 if (unlikely(sigint == 1))
299 break;
300
301 if (frame_count_max != 0) {
302 if (ctx->tx_packets >= frame_count_max) {
303 sigint = 1;
304 break;
305 }
306 }
307 }
308 }
309
310 out:
311
312 bug_on(gettimeofday(&end, NULL));
313 timersub(&end, &start, &diff);
314
315 timer_purge();
316
317 bpf_release(&bpf_ops);
318
319 dissector_cleanup_all();
320 destroy_tx_ring(tx_sock, &tx_ring);
321
322 if (ctx->rfraw)
323 leave_rfmon_mac80211(ctx->device_trans, ctx->device_out);
324
325 if (__pcap_io->prepare_close_pcap)
326 __pcap_io->prepare_close_pcap(fd, PCAP_MODE_RD);
327
328 if (!strncmp("-", ctx->device_in, strlen("-")))
329 dup2(fd, fileno(stdin));
330 close(fd);
331
332 close(tx_sock);
333
334 fflush(stdout);
335 printf("\n");
336 printf("\r%12lu packets outgoing\n", ctx->tx_packets);
337 printf("\r%12lu packets truncated in file\n", trunced);
338 printf("\r%12lu bytes outgoing\n", ctx->tx_bytes);
339 printf("\r%12lu sec, %lu usec in total\n", diff.tv_sec, diff.tv_usec);
340 }
341
342 static void receive_to_xmit(struct ctx *ctx)
343 {
344 short ifflags = 0;
345 uint8_t *in, *out;
346 int rx_sock, ifindex_in, ifindex_out;
347 unsigned int size_in, size_out, it_in = 0, it_out = 0;
348 unsigned long frame_count = 0;
349 struct frame_map *hdr_in, *hdr_out;
350 struct ring tx_ring, rx_ring;
351 struct pollfd rx_poll;
352 struct sock_fprog bpf_ops;
353
354 if (!strncmp(ctx->device_in, ctx->device_out, IFNAMSIZ))
355 panic("Ingress/egress devices must be different!\n");
356 if (!device_up_and_running(ctx->device_out))
357 panic("Egress device not up and running!\n");
358
359 rx_sock = pf_socket();
360 tx_sock = pf_socket();
361
362 fmemset(&tx_ring, 0, sizeof(tx_ring));
363 fmemset(&rx_ring, 0, sizeof(rx_ring));
364 fmemset(&rx_poll, 0, sizeof(rx_poll));
365 fmemset(&bpf_ops, 0, sizeof(bpf_ops));
366
367 ifindex_in = device_ifindex(ctx->device_in);
368 ifindex_out = device_ifindex(ctx->device_out);
369
370 size_in = ring_size(ctx->device_in, ctx->reserve_size);
371 size_out = ring_size(ctx->device_out, ctx->reserve_size);
372
373 enable_kernel_bpf_jit_compiler();
374
375 bpf_parse_rules(ctx->filter, &bpf_ops, ctx->link_type);
376 if (ctx->dump_bpf)
377 bpf_dump_all(&bpf_ops);
378 bpf_attach_to_sock(rx_sock, &bpf_ops);
379
380 setup_rx_ring_layout(rx_sock, &rx_ring, size_in, ctx->jumbo, false);
381 create_rx_ring(rx_sock, &rx_ring, ctx->verbose);
382 mmap_rx_ring(rx_sock, &rx_ring);
383 alloc_rx_ring_frames(rx_sock, &rx_ring);
384 bind_rx_ring(rx_sock, &rx_ring, ifindex_in);
385 prepare_polling(rx_sock, &rx_poll);
386
387 set_packet_loss_discard(tx_sock);
388 setup_tx_ring_layout(tx_sock, &tx_ring, size_out, ctx->jumbo);
389 create_tx_ring(tx_sock, &tx_ring, ctx->verbose);
390 mmap_tx_ring(tx_sock, &tx_ring);
391 alloc_tx_ring_frames(tx_sock, &tx_ring);
392 bind_tx_ring(tx_sock, &tx_ring, ifindex_out);
393
394 dissector_init_all(ctx->print_mode);
395
396 if (ctx->promiscuous)
397 ifflags = enter_promiscuous_mode(ctx->device_in);
398
399 if (ctx->kpull)
400 interval = ctx->kpull;
401
402 set_itimer_interval_value(&itimer, 0, interval);
403 setitimer(ITIMER_REAL, &itimer, NULL);
404
405 drop_privileges(ctx->enforce, ctx->uid, ctx->gid);
406
407 printf("Running! Hang up with ^C!\n\n");
408 fflush(stdout);
409
410 while (likely(sigint == 0)) {
411 while (user_may_pull_from_rx(rx_ring.frames[it_in].iov_base)) {
412 __label__ next;
413
414 hdr_in = rx_ring.frames[it_in].iov_base;
415 in = ((uint8_t *) hdr_in) + hdr_in->tp_h.tp_mac;
416
417 frame_count++;
418
419 if (ctx->packet_type != -1)
420 if (ctx->packet_type != hdr_in->s_ll.sll_pkttype)
421 goto next;
422
423 hdr_out = tx_ring.frames[it_out].iov_base;
424 out = ((uint8_t *) hdr_out) + TPACKET2_HDRLEN - sizeof(struct sockaddr_ll);
425
426 for (; !user_may_pull_from_tx(tx_ring.frames[it_out].iov_base) &&
427 likely(!sigint);) {
428 if (ctx->randomize)
429 next_rnd_slot(&it_out, &tx_ring);
430 else {
431 it_out++;
432 if (it_out >= tx_ring.layout.tp_frame_nr)
433 it_out = 0;
434 }
435
436 hdr_out = tx_ring.frames[it_out].iov_base;
437 out = ((uint8_t *) hdr_out) + TPACKET2_HDRLEN - sizeof(struct sockaddr_ll);
438 }
439
440 tpacket_hdr_clone(&hdr_out->tp_h, &hdr_in->tp_h);
441 fmemcpy(out, in, hdr_in->tp_h.tp_len);
442
443 kernel_may_pull_from_tx(&hdr_out->tp_h);
444 if (ctx->randomize)
445 next_rnd_slot(&it_out, &tx_ring);
446 else {
447 it_out++;
448 if (it_out >= tx_ring.layout.tp_frame_nr)
449 it_out = 0;
450 }
451
452 show_frame_hdr(hdr_in, ctx->print_mode);
453
454 dissector_entry_point(in, hdr_in->tp_h.tp_snaplen,
455 ctx->link_type, ctx->print_mode);
456
457 if (frame_count_max != 0) {
458 if (frame_count >= frame_count_max) {
459 sigint = 1;
460 break;
461 }
462 }
463
464 next:
465
466 kernel_may_pull_from_rx(&hdr_in->tp_h);
467
468 it_in++;
469 if (it_in >= rx_ring.layout.tp_frame_nr)
470 it_in = 0;
471
472 if (unlikely(sigint == 1))
473 goto out;
474 }
475
476 poll(&rx_poll, 1, -1);
477 }
478
479 out:
480
481 timer_purge();
482
483 sock_rx_net_stats(rx_sock, 0);
484
485 bpf_release(&bpf_ops);
486
487 dissector_cleanup_all();
488
489 destroy_tx_ring(tx_sock, &tx_ring);
490 destroy_rx_ring(rx_sock, &rx_ring);
491
492 if (ctx->promiscuous)
493 leave_promiscuous_mode(ctx->device_in, ifflags);
494
495 close(tx_sock);
496 close(rx_sock);
497 }
498
499 static void translate_pcap_to_txf(int fdo, uint8_t *out, size_t len)
500 {
501 size_t bytes_done = 0;
502 char bout[80];
503
504 slprintf(bout, sizeof(bout), "{\n ");
505 write_or_die(fdo, bout, strlen(bout));
506
507 while (bytes_done < len) {
508 slprintf(bout, sizeof(bout), "0x%02x, ", out[bytes_done]);
509 write_or_die(fdo, bout, strlen(bout));
510
511 bytes_done++;
512
513 if (bytes_done % 10 == 0) {
514 slprintf(bout, sizeof(bout), "\n");
515 write_or_die(fdo, bout, strlen(bout));
516
517 if (bytes_done < len) {
518 slprintf(bout, sizeof(bout), " ");
519 write_or_die(fdo, bout, strlen(bout));
520 }
521 }
522 }
523 if (bytes_done % 10 != 0) {
524 slprintf(bout, sizeof(bout), "\n");
525 write_or_die(fdo, bout, strlen(bout));
526 }
527
528 slprintf(bout, sizeof(bout), "}\n\n");
529 write_or_die(fdo, bout, strlen(bout));
530 }
531
532 static void read_pcap(struct ctx *ctx)
533 {
534 __label__ out;
535 uint8_t *out;
536 int ret, fd, fdo = 0;
537 unsigned long trunced = 0;
538 size_t out_len;
539 pcap_pkthdr_t phdr;
540 struct sock_fprog bpf_ops;
541 struct frame_map fm;
542 struct timeval start, end, diff;
543 struct sockaddr_ll sll;
544
545 bug_on(!__pcap_io);
546
547 if (!strncmp("-", ctx->device_in, strlen("-"))) {
548 fd = dup_or_die(fileno(stdin));
549 close(fileno(stdin));
550 if (ctx->pcap == PCAP_OPS_MM)
551 ctx->pcap = PCAP_OPS_SG;
552 } else {
553 fd = open_or_die(ctx->device_in, O_RDONLY | O_LARGEFILE | O_NOATIME);
554 }
555
556 if (__pcap_io->init_once_pcap)
557 __pcap_io->init_once_pcap();
558
559 ret = __pcap_io->pull_fhdr_pcap(fd, &ctx->magic, &ctx->link_type);
560 if (ret)
561 panic("Error reading pcap header!\n");
562
563 if (__pcap_io->prepare_access_pcap) {
564 ret = __pcap_io->prepare_access_pcap(fd, PCAP_MODE_RD, ctx->jumbo);
565 if (ret)
566 panic("Error prepare reading pcap!\n");
567 }
568
569 fmemset(&fm, 0, sizeof(fm));
570 fmemset(&bpf_ops, 0, sizeof(bpf_ops));
571
572 bpf_parse_rules(ctx->filter, &bpf_ops, ctx->link_type);
573 if (ctx->dump_bpf)
574 bpf_dump_all(&bpf_ops);
575
576 dissector_init_all(ctx->print_mode);
577
578 out_len = round_up(1024 * 1024, PAGE_SIZE);
579 out = xmalloc_aligned(out_len, CO_CACHE_LINE_SIZE);
580
581 if (ctx->device_out) {
582 if (!strncmp("-", ctx->device_out, strlen("-"))) {
583 fdo = dup_or_die(fileno(stdout));
584 close(fileno(stdout));
585 } else {
586 fdo = open_or_die_m(ctx->device_out, O_RDWR | O_CREAT |
587 O_TRUNC | O_LARGEFILE, DEFFILEMODE);
588 }
589 }
590
591 drop_privileges(ctx->enforce, ctx->uid, ctx->gid);
592
593 printf("Running! Hang up with ^C!\n\n");
594 fflush(stdout);
595
596 bug_on(gettimeofday(&start, NULL));
597
598 while (likely(sigint == 0)) {
599 do {
600 ret = __pcap_io->read_pcap(fd, &phdr, ctx->magic,
601 out, out_len);
602 if (unlikely(ret < 0))
603 goto out;
604
605 if (unlikely(pcap_get_length(&phdr, ctx->magic) == 0)) {
606 trunced++;
607 continue;
608 }
609
610 if (unlikely(pcap_get_length(&phdr, ctx->magic) > out_len)) {
611 pcap_set_length(&phdr, ctx->magic, out_len);
612 trunced++;
613 }
614 } while (ctx->filter &&
615 !bpf_run_filter(&bpf_ops, out,
616 pcap_get_length(&phdr, ctx->magic)));
617
618 pcap_pkthdr_to_tpacket_hdr(&phdr, ctx->magic, &fm.tp_h, &sll);
619
620 ctx->tx_bytes += fm.tp_h.tp_len;
621 ctx->tx_packets++;
622
623 show_frame_hdr(&fm, ctx->print_mode);
624
625 dissector_entry_point(out, fm.tp_h.tp_snaplen,
626 ctx->link_type, ctx->print_mode);
627
628 if (ctx->device_out)
629 translate_pcap_to_txf(fdo, out, fm.tp_h.tp_snaplen);
630
631 if (frame_count_max != 0) {
632 if (ctx->tx_packets >= frame_count_max) {
633 sigint = 1;
634 break;
635 }
636 }
637 }
638
639 out:
640
641 bug_on(gettimeofday(&end, NULL));
642 timersub(&end, &start, &diff);
643
644 bpf_release(&bpf_ops);
645
646 dissector_cleanup_all();
647
648 if (__pcap_io->prepare_close_pcap)
649 __pcap_io->prepare_close_pcap(fd, PCAP_MODE_RD);
650
651 xfree(out);
652
653 fflush(stdout);
654 printf("\n");
655 printf("\r%12lu packets outgoing\n", ctx->tx_packets);
656 printf("\r%12lu packets truncated in file\n", trunced);
657 printf("\r%12lu bytes outgoing\n", ctx->tx_bytes);
658 printf("\r%12lu sec, %lu usec in total\n", diff.tv_sec, diff.tv_usec);
659
660 if (!strncmp("-", ctx->device_in, strlen("-")))
661 dup2(fd, fileno(stdin));
662 close(fd);
663
664 if (ctx->device_out) {
665 if (!strncmp("-", ctx->device_out, strlen("-")))
666 dup2(fdo, fileno(stdout));
667 close(fdo);
668 }
669 }
670
671 static void finish_multi_pcap_file(struct ctx *ctx, int fd)
672 {
673 __pcap_io->fsync_pcap(fd);
674
675 if (__pcap_io->prepare_close_pcap)
676 __pcap_io->prepare_close_pcap(fd, PCAP_MODE_WR);
677
678 close(fd);
679
680 fmemset(&itimer, 0, sizeof(itimer));
681 setitimer(ITIMER_REAL, &itimer, NULL);
682 }
683
684 static int next_multi_pcap_file(struct ctx *ctx, int fd)
685 {
686 int ret;
687 char fname[512];
688
689 __pcap_io->fsync_pcap(fd);
690
691 if (__pcap_io->prepare_close_pcap)
692 __pcap_io->prepare_close_pcap(fd, PCAP_MODE_WR);
693
694 close(fd);
695
696 slprintf(fname, sizeof(fname), "%s/%s%lu.pcap", ctx->device_out,
697 ctx->prefix ? : "dump-", time(NULL));
698
699 fd = open_or_die_m(fname, O_RDWR | O_CREAT | O_TRUNC |
700 O_LARGEFILE, DEFFILEMODE);
701
702 ret = __pcap_io->push_fhdr_pcap(fd, ctx->magic, ctx->link_type);
703 if (ret)
704 panic("Error writing pcap header!\n");
705
706 if (__pcap_io->prepare_access_pcap) {
707 ret = __pcap_io->prepare_access_pcap(fd, PCAP_MODE_WR, true);
708 if (ret)
709 panic("Error prepare writing pcap!\n");
710 }
711
712 return fd;
713 }
714
715 static int begin_multi_pcap_file(struct ctx *ctx)
716 {
717 int fd, ret;
718 char fname[256];
719
720 bug_on(!__pcap_io);
721
722 if (ctx->device_out[strlen(ctx->device_out) - 1] == '/')
723 ctx->device_out[strlen(ctx->device_out) - 1] = 0;
724
725 slprintf(fname, sizeof(fname), "%s/%s%lu.pcap", ctx->device_out,
726 ctx->prefix ? : "dump-", time(NULL));
727
728 fd = open_or_die_m(fname, O_RDWR | O_CREAT | O_TRUNC |
729 O_LARGEFILE, DEFFILEMODE);
730
731 ret = __pcap_io->push_fhdr_pcap(fd, ctx->magic, ctx->link_type);
732 if (ret)
733 panic("Error writing pcap header!\n");
734
735 if (__pcap_io->prepare_access_pcap) {
736 ret = __pcap_io->prepare_access_pcap(fd, PCAP_MODE_WR, true);
737 if (ret)
738 panic("Error prepare writing pcap!\n");
739 }
740
741 if (ctx->dump_mode == DUMP_INTERVAL_TIME) {
742 interval = ctx->dump_interval;
743
744 set_itimer_interval_value(&itimer, interval, 0);
745 setitimer(ITIMER_REAL, &itimer, NULL);
746 } else {
747 interval = 0;
748 }
749
750 return fd;
751 }
752
753 static void finish_single_pcap_file(struct ctx *ctx, int fd)
754 {
755 __pcap_io->fsync_pcap(fd);
756
757 if (__pcap_io->prepare_close_pcap)
758 __pcap_io->prepare_close_pcap(fd, PCAP_MODE_WR);
759
760 if (strncmp("-", ctx->device_out, strlen("-")))
761 close(fd);
762 else
763 dup2(fd, fileno(stdout));
764 }
765
766 static int begin_single_pcap_file(struct ctx *ctx)
767 {
768 int fd, ret;
769
770 bug_on(!__pcap_io);
771
772 if (!strncmp("-", ctx->device_out, strlen("-"))) {
773 fd = dup_or_die(fileno(stdout));
774 close(fileno(stdout));
775 if (ctx->pcap == PCAP_OPS_MM)
776 ctx->pcap = PCAP_OPS_SG;
777 } else {
778 fd = open_or_die_m(ctx->device_out,
779 O_RDWR | O_CREAT | O_TRUNC |
780 O_LARGEFILE, DEFFILEMODE);
781 }
782
783 ret = __pcap_io->push_fhdr_pcap(fd, ctx->magic, ctx->link_type);
784 if (ret)
785 panic("Error writing pcap header!\n");
786
787 if (__pcap_io->prepare_access_pcap) {
788 ret = __pcap_io->prepare_access_pcap(fd, PCAP_MODE_WR, true);
789 if (ret)
790 panic("Error prepare writing pcap!\n");
791 }
792
793 return fd;
794 }
795
796 static void print_pcap_file_stats(int sock, struct ctx *ctx)
797 {
798 int ret;
799 struct tpacket_stats kstats;
800 socklen_t slen = sizeof(kstats);
801
802 fmemset(&kstats, 0, sizeof(kstats));
803
804 ret = getsockopt(sock, SOL_PACKET, PACKET_STATISTICS, &kstats, &slen);
805 if (unlikely(ret))
806 panic("Cannot get packet statistics!\n");
807
808 if (ctx->print_mode == PRINT_NONE) {
809 printf(".(+%u/-%u)", kstats.tp_packets - kstats.tp_drops,
810 kstats.tp_drops);
811 fflush(stdout);
812 }
813 }
814
815 static void walk_t3_block(struct block_desc *pbd, struct ctx *ctx,
816 int sock, int *fd, unsigned long *frame_count)
817 {
818 uint8_t *packet;
819 int num_pkts = pbd->h1.num_pkts, i, ret;
820 struct tpacket3_hdr *hdr;
821 pcap_pkthdr_t phdr;
822 struct sockaddr_ll *sll;
823
824 hdr = (void *) ((uint8_t *) pbd + pbd->h1.offset_to_first_pkt);
825 sll = (void *) ((uint8_t *) hdr + TPACKET_ALIGN(sizeof(*hdr)));
826
827 for (i = 0; i < num_pkts && likely(sigint == 0); ++i) {
828 __label__ next;
829 packet = ((uint8_t *) hdr + hdr->tp_mac);
830
831 if (ctx->packet_type != -1)
832 if (ctx->packet_type != sll->sll_pkttype)
833 goto next;
834
835 (*frame_count)++;
836
837 if (dump_to_pcap(ctx)) {
838 tpacket3_hdr_to_pcap_pkthdr(hdr, sll, &phdr, ctx->magic);
839
840 ret = __pcap_io->write_pcap(*fd, &phdr, ctx->magic, packet,
841 pcap_get_length(&phdr, ctx->magic));
842 if (unlikely(ret != pcap_get_total_length(&phdr, ctx->magic)))
843 panic("Write error to pcap!\n");
844 }
845
846 __show_frame_hdr(sll, hdr, ctx->print_mode, true);
847
848 dissector_entry_point(packet, hdr->tp_snaplen, ctx->link_type,
849 ctx->print_mode);
850 next:
851
852 hdr = (void *) ((uint8_t *) hdr + hdr->tp_next_offset);
853 sll = (void *) ((uint8_t *) hdr + TPACKET_ALIGN(sizeof(*hdr)));
854
855 if (frame_count_max != 0) {
856 if (unlikely(*frame_count >= frame_count_max)) {
857 sigint = 1;
858 break;
859 }
860 }
861
862 if (dump_to_pcap(ctx)) {
863 if (ctx->dump_mode == DUMP_INTERVAL_SIZE) {
864 interval += hdr->tp_snaplen;
865 if (interval > ctx->dump_interval) {
866 next_dump = true;
867 interval = 0;
868 }
869 }
870
871 if (next_dump) {
872 *fd = next_multi_pcap_file(ctx, *fd);
873 next_dump = false;
874
875 if (unlikely(ctx->verbose))
876 print_pcap_file_stats(sock, ctx);
877 }
878 }
879 }
880 }
881
882 static void recv_only_or_dump(struct ctx *ctx)
883 {
884 short ifflags = 0;
885 int sock, irq, ifindex, fd = 0, ret;
886 unsigned int size, it = 0;
887 struct ring rx_ring;
888 struct pollfd rx_poll;
889 struct sock_fprog bpf_ops;
890 struct timeval start, end, diff;
891 struct block_desc *pbd;
892 unsigned long frame_count = 0;
893
894 sock = pf_socket();
895
896 if (ctx->rfraw) {
897 ctx->device_trans = xstrdup(ctx->device_in);
898 xfree(ctx->device_in);
899
900 enter_rfmon_mac80211(ctx->device_trans, &ctx->device_in);
901 ctx->link_type = LINKTYPE_IEEE802_11;
902 }
903
904 fmemset(&rx_ring, 0, sizeof(rx_ring));
905 fmemset(&rx_poll, 0, sizeof(rx_poll));
906 fmemset(&bpf_ops, 0, sizeof(bpf_ops));
907
908 ifindex = device_ifindex(ctx->device_in);
909
910 size = ring_size(ctx->device_in, ctx->reserve_size);
911
912 enable_kernel_bpf_jit_compiler();
913
914 bpf_parse_rules(ctx->filter, &bpf_ops, ctx->link_type);
915 if (ctx->dump_bpf)
916 bpf_dump_all(&bpf_ops);
917 bpf_attach_to_sock(sock, &bpf_ops);
918
919 ret = set_sockopt_hwtimestamp(sock, ctx->device_in);
920 if (ret == 0 && ctx->verbose)
921 printf("HW timestamping enabled\n");
922
923 setup_rx_ring_layout(sock, &rx_ring, size, true, true);
924 create_rx_ring(sock, &rx_ring, ctx->verbose);
925 mmap_rx_ring(sock, &rx_ring);
926 alloc_rx_ring_frames(sock, &rx_ring);
927 bind_rx_ring(sock, &rx_ring, ifindex);
928
929 prepare_polling(sock, &rx_poll);
930 dissector_init_all(ctx->print_mode);
931
932 if (ctx->cpu >= 0 && ifindex > 0) {
933 irq = device_irq_number(ctx->device_in);
934 device_set_irq_affinity(irq, ctx->cpu);
935
936 if (ctx->verbose)
937 printf("IRQ: %s:%d > CPU%d\n",
938 ctx->device_in, irq, ctx->cpu);
939 }
940
941 if (ctx->promiscuous)
942 ifflags = enter_promiscuous_mode(ctx->device_in);
943
944 if (dump_to_pcap(ctx) && __pcap_io->init_once_pcap)
945 __pcap_io->init_once_pcap();
946
947 drop_privileges(ctx->enforce, ctx->uid, ctx->gid);
948
949 if (dump_to_pcap(ctx)) {
950 __label__ try_file;
951 struct stat stats;
952
953 fmemset(&stats, 0, sizeof(stats));
954 ret = stat(ctx->device_out, &stats);
955 if (ret < 0) {
956 ctx->dump_dir = 0;
957 goto try_file;
958 }
959
960 ctx->dump_dir = S_ISDIR(stats.st_mode);
961 if (ctx->dump_dir) {
962 fd = begin_multi_pcap_file(ctx);
963 } else {
964 try_file:
965 fd = begin_single_pcap_file(ctx);
966 }
967 }
968
969 printf("Running! Hang up with ^C!\n\n");
970 fflush(stdout);
971
972 bug_on(gettimeofday(&start, NULL));
973
974 while (likely(sigint == 0)) {
975 while (user_may_pull_from_rx_block((pbd = (void *)
976 rx_ring.frames[it].iov_base))) {
977 walk_t3_block(pbd, ctx, sock, &fd, &frame_count);
978
979 kernel_may_pull_from_rx_block(pbd);
980 it = (it + 1) % rx_ring.layout3.tp_block_nr;
981
982 if (unlikely(sigint == 1))
983 break;
984 }
985
986 poll(&rx_poll, 1, -1);
987 }
988
989 bug_on(gettimeofday(&end, NULL));
990 timersub(&end, &start, &diff);
991
992 if (!(ctx->dump_dir && ctx->print_mode == PRINT_NONE)) {
993 sock_rx_net_stats(sock, frame_count);
994
995 printf("\r%12lu sec, %lu usec in total\n",
996 diff.tv_sec, diff.tv_usec);
997 } else {
998 printf("\n\n");
999 fflush(stdout);
1000 }
1001
1002 bpf_release(&bpf_ops);
1003 dissector_cleanup_all();
1004 destroy_rx_ring(sock, &rx_ring);
1005
1006 if (ctx->promiscuous)
1007 leave_promiscuous_mode(ctx->device_in, ifflags);
1008
1009 if (ctx->rfraw)
1010 leave_rfmon_mac80211(ctx->device_trans, ctx->device_in);
1011
1012 if (dump_to_pcap(ctx)) {
1013 if (ctx->dump_dir)
1014 finish_multi_pcap_file(ctx, fd);
1015 else
1016 finish_single_pcap_file(ctx, fd);
1017 }
1018
1019 close(sock);
1020 }
1021
1022 static void init_ctx(struct ctx *ctx)
1023 {
1024 memset(ctx, 0, sizeof(*ctx));
1025 ctx->uid = getuid();
1026 ctx->uid = getgid();
1027
1028 ctx->cpu = -1;
1029 ctx->packet_type = -1;
1030
1031 ctx->magic = ORIGINAL_TCPDUMP_MAGIC;
1032 ctx->print_mode = PRINT_NORM;
1033 ctx->pcap = PCAP_OPS_SG;
1034
1035 ctx->dump_mode = DUMP_INTERVAL_TIME;
1036 ctx->dump_interval = 60;
1037
1038 ctx->promiscuous = true;
1039 ctx->randomize = false;
1040 }
1041
1042 static void destroy_ctx(struct ctx *ctx)
1043 {
1044 free(ctx->device_in);
1045 free(ctx->device_out);
1046 free(ctx->device_trans);
1047
1048 free(ctx->prefix);
1049 }
1050
1051 static void __noreturn help(void)
1052 {
1053 printf("\nnetsniff-ng %s, the packet sniffing beast\n", VERSION_STRING);
1054 puts("http://www.netsniff-ng.org\n\n"
1055 "Usage: netsniff-ng [options] [filter-expression]\n"
1056 "Options:\n"
1057 " -i|-d|--dev|--in <dev|pcap|-> Input source as netdev, pcap or pcap stdin\n"
1058 " -o|--out <dev|pcap|dir|cfg|-> Output sink as netdev, pcap, directory, trafgen, or stdout\n"
1059 " -f|--filter <bpf-file|expr> Use BPF filter file from bpfc or tcpdump-like expression\n"
1060 " -t|--type <type> Filter for: host|broadcast|multicast|others|outgoing\n"
1061 " -F|--interval <size|time> Dump interval if -o is a dir: <num>KiB/MiB/GiB/s/sec/min/hrs\n"
1062 " -R|--rfraw Capture or inject raw 802.11 frames\n"
1063 " -n|--num <0|uint> Number of packets until exit (def: 0)\n"
1064 " -P|--prefix <name> Prefix for pcaps stored in directory\n"
1065 " -T|--magic <pcap-magic> Pcap magic number/pcap format to store, see -D\n"
1066 " -D|--dump-pcap-types Dump pcap types and magic numbers and quit\n"
1067 " -B|--dump-bpf Dump generated BPF assembly\n"
1068 " -r|--rand Randomize packet forwarding order (dev->dev)\n"
1069 " -M|--no-promisc No promiscuous mode for netdev\n"
1070 " -A|--no-sock-mem Don't tune core socket memory\n"
1071 " -m|--mmap Mmap(2) pcap file i.e., for replaying pcaps\n"
1072 " -G|--sg Scatter/gather pcap file I/O\n"
1073 " -c|--clrw Use slower read(2)/write(2) I/O\n"
1074 " -S|--ring-size <size> Specify ring size to: <num>KiB/MiB/GiB\n"
1075 " -k|--kernel-pull <uint> Kernel pull from user interval in us (def: 10us)\n"
1076 " -J|--jumbo-support Support replay/fwd 64KB Super Jumbo Frames (def: 2048B)\n"
1077 " -b|--bind-cpu <cpu> Bind to specific CPU\n"
1078 " -u|--user <userid> Drop privileges and change to userid\n"
1079 " -g|--group <groupid> Drop privileges and change to groupid\n"
1080 " -H|--prio-high Make this high priority process\n"
1081 " -Q|--notouch-irq Do not touch IRQ CPU affinity of NIC\n"
1082 " -s|--silent Do not print captured packets\n"
1083 " -q|--less Print less-verbose packet information\n"
1084 " -X|--hex Print packet data in hex format\n"
1085 " -l|--ascii Print human-readable packet data\n"
1086 " -U|--update Update GeoIP databases\n"
1087 " -V|--verbose Be more verbose\n"
1088 " -v|--version Show version and exit\n"
1089 " -h|--help Guess what?!\n\n"
1090 "Examples:\n"
1091 " netsniff-ng --in eth0 --out dump.pcap -s -T 0xa1b2c3d4 --b 0 tcp or udp\n"
1092 " netsniff-ng --in wlan0 --rfraw --out dump.pcap --silent --bind-cpu 0\n"
1093 " netsniff-ng --in dump.pcap --mmap --out eth0 -k1000 --silent --bind-cpu 0\n"
1094 " netsniff-ng --in dump.pcap --out dump.cfg --silent --bind-cpu 0\n"
1095 " netsniff-ng --in eth0 --out eth1 --silent --bind-cpu 0 -J --type host\n"
1096 " netsniff-ng --in eth1 --out /opt/probe/ -s -m --interval 100MiB -b 0\n"
1097 " netsniff-ng --in vlan0 --out dump.pcap -c -u `id -u bob` -g `id -g bob`\n"
1098 " netsniff-ng --in any --filter http.bpf --jumbo-support --ascii -V\n\n"
1099 "Note:\n"
1100 " For introducing bit errors, delays with random variation and more\n"
1101 " while replaying pcaps, make use of tc(8) with its disciplines (e.g. netem).\n\n"
1102 "Please report bugs to <bugs@netsniff-ng.org>\n"
1103 "Copyright (C) 2009-2013 Daniel Borkmann <dborkma@tik.ee.ethz.ch>\n"
1104 "Copyright (C) 2009-2012 Emmanuel Roullit <emmanuel.roullit@gmail.com>\n"
1105 "Copyright (C) 2012 Markus Amend <markus@netsniff-ng.org>\n"
1106 "Swiss federal institute of technology (ETH Zurich)\n"
1107 "License: GNU GPL version 2.0\n"
1108 "This is free software: you are free to change and redistribute it.\n"
1109 "There is NO WARRANTY, to the extent permitted by law.\n");
1110 die();
1111 }
1112
1113 static void __noreturn version(void)
1114 {
1115 printf("\nnetsniff-ng %s, Git id: %s\n", VERSION_LONG, GITVERSION);
1116 puts("the packet sniffing beast\n"
1117 "http://www.netsniff-ng.org\n\n"
1118 "Please report bugs to <bugs@netsniff-ng.org>\n"
1119 "Copyright (C) 2009-2013 Daniel Borkmann <dborkma@tik.ee.ethz.ch>\n"
1120 "Copyright (C) 2009-2012 Emmanuel Roullit <emmanuel.roullit@gmail.com>\n"
1121 "Copyright (C) 2012 Markus Amend <markus@netsniff-ng.org>\n"
1122 "Swiss federal institute of technology (ETH Zurich)\n"
1123 "License: GNU GPL version 2.0\n"
1124 "This is free software: you are free to change and redistribute it.\n"
1125 "There is NO WARRANTY, to the extent permitted by law.\n");
1126 die();
1127 }
1128
1129 int main(int argc, char **argv)
1130 {
1131 char *ptr;
1132 int c, i, j, cpu_tmp, opt_index, ops_touched = 0, vals[4] = {0};
1133 bool prio_high = false, setsockmem = true;
1134 void (*main_loop)(struct ctx *ctx) = NULL;
1135 struct ctx ctx;
1136
1137 init_ctx(&ctx);
1138 srand(time(NULL));
1139
1140 while ((c = getopt_long(argc, argv, short_options, long_options,
1141 &opt_index)) != EOF) {
1142 switch (c) {
1143 case 'd':
1144 case 'i':
1145 ctx.device_in = xstrdup(optarg);
1146 break;
1147 case 'o':
1148 ctx.device_out = xstrdup(optarg);
1149 break;
1150 case 'P':
1151 ctx.prefix = xstrdup(optarg);
1152 break;
1153 case 'R':
1154 ctx.link_type = LINKTYPE_IEEE802_11;
1155 ctx.rfraw = 1;
1156 break;
1157 case 'r':
1158 ctx.randomize = true;
1159 break;
1160 case 'J':
1161 ctx.jumbo = true;
1162 break;
1163 case 'T':
1164 ctx.magic = (uint32_t) strtoul(optarg, NULL, 0);
1165 pcap_check_magic(ctx.magic);
1166 break;
1167 case 'f':
1168 ctx.filter = xstrdup(optarg);
1169 break;
1170 case 'M':
1171 ctx.promiscuous = false;
1172 break;
1173 case 'A':
1174 setsockmem = false;
1175 break;
1176 case 'u':
1177 ctx.uid = strtoul(optarg, NULL, 0);
1178 ctx.enforce = true;
1179 break;
1180 case 'g':
1181 ctx.gid = strtoul(optarg, NULL, 0);
1182 ctx.enforce = true;
1183 break;
1184 case 't':
1185 if (!strncmp(optarg, "host", strlen("host")))
1186 ctx.packet_type = PACKET_HOST;
1187 else if (!strncmp(optarg, "broadcast", strlen("broadcast")))
1188 ctx.packet_type = PACKET_BROADCAST;
1189 else if (!strncmp(optarg, "multicast", strlen("multicast")))
1190 ctx.packet_type = PACKET_MULTICAST;
1191 else if (!strncmp(optarg, "others", strlen("others")))
1192 ctx.packet_type = PACKET_OTHERHOST;
1193 else if (!strncmp(optarg, "outgoing", strlen("outgoing")))
1194 ctx.packet_type = PACKET_OUTGOING;
1195 else
1196 ctx.packet_type = -1;
1197 break;
1198 case 'S':
1199 ptr = optarg;
1200 ctx.reserve_size = 0;
1201
1202 for (j = i = strlen(optarg); i > 0; --i) {
1203 if (!isdigit(optarg[j - i]))
1204 break;
1205 ptr++;
1206 }
1207
1208 if (!strncmp(ptr, "KiB", strlen("KiB")))
1209 ctx.reserve_size = 1 << 10;
1210 else if (!strncmp(ptr, "MiB", strlen("MiB")))
1211 ctx.reserve_size = 1 << 20;
1212 else if (!strncmp(ptr, "GiB", strlen("GiB")))
1213 ctx.reserve_size = 1 << 30;
1214 else
1215 panic("Syntax error in ring size param!\n");
1216 *ptr = 0;
1217
1218 ctx.reserve_size *= strtol(optarg, NULL, 0);
1219 break;
1220 case 'b':
1221 cpu_tmp = strtol(optarg, NULL, 0);
1222
1223 cpu_affinity(cpu_tmp);
1224 if (ctx.cpu != -2)
1225 ctx.cpu = cpu_tmp;
1226 break;
1227 case 'H':
1228 prio_high = true;
1229 break;
1230 case 'c':
1231 ctx.pcap = PCAP_OPS_RW;
1232 ops_touched = 1;
1233 break;
1234 case 'm':
1235 ctx.pcap = PCAP_OPS_MM;
1236 ops_touched = 1;
1237 break;
1238 case 'G':
1239 ctx.pcap = PCAP_OPS_SG;
1240 ops_touched = 1;
1241 break;
1242 case 'Q':
1243 ctx.cpu = -2;
1244 break;
1245 case 's':
1246 ctx.print_mode = PRINT_NONE;
1247 break;
1248 case 'q':
1249 ctx.print_mode = PRINT_LESS;
1250 break;
1251 case 'X':
1252 ctx.print_mode =
1253 (ctx.print_mode == PRINT_ASCII) ?
1254 PRINT_HEX_ASCII : PRINT_HEX;
1255 break;
1256 case 'l':
1257 ctx.print_mode =
1258 (ctx.print_mode == PRINT_HEX) ?
1259 PRINT_HEX_ASCII : PRINT_ASCII;
1260 break;
1261 case 'k':
1262 ctx.kpull = strtol(optarg, NULL, 0);
1263 break;
1264 case 'n':
1265 frame_count_max = strtol(optarg, NULL, 0);
1266 break;
1267 case 'F':
1268 ptr = optarg;
1269 ctx.dump_interval = 0;
1270
1271 for (j = i = strlen(optarg); i > 0; --i) {
1272 if (!isdigit(optarg[j - i]))
1273 break;
1274 ptr++;
1275 }
1276
1277 if (!strncmp(ptr, "KiB", strlen("KiB"))) {
1278 ctx.dump_interval = 1 << 10;
1279 ctx.dump_mode = DUMP_INTERVAL_SIZE;
1280 } else if (!strncmp(ptr, "MiB", strlen("MiB"))) {
1281 ctx.dump_interval = 1 << 20;
1282 ctx.dump_mode = DUMP_INTERVAL_SIZE;
1283 } else if (!strncmp(ptr, "GiB", strlen("GiB"))) {
1284 ctx.dump_interval = 1 << 30;
1285 ctx.dump_mode = DUMP_INTERVAL_SIZE;
1286 } else if (!strncmp(ptr, "sec", strlen("sec"))) {
1287 ctx.dump_interval = 1;
1288 ctx.dump_mode = DUMP_INTERVAL_TIME;
1289 } else if (!strncmp(ptr, "min", strlen("min"))) {
1290 ctx.dump_interval = 60;
1291 ctx.dump_mode = DUMP_INTERVAL_TIME;
1292 } else if (!strncmp(ptr, "hrs", strlen("hrs"))) {
1293 ctx.dump_interval = 60 * 60;
1294 ctx.dump_mode = DUMP_INTERVAL_TIME;
1295 } else if (!strncmp(ptr, "s", strlen("s"))) {
1296 ctx.dump_interval = 1;
1297 ctx.dump_mode = DUMP_INTERVAL_TIME;
1298 } else {
1299 panic("Syntax error in time/size param!\n");
1300 }
1301
1302 *ptr = 0;
1303 ctx.dump_interval *= strtol(optarg, NULL, 0);
1304 break;
1305 case 'V':
1306 ctx.verbose = 1;
1307 break;
1308 case 'B':
1309 ctx.dump_bpf = true;
1310 break;
1311 case 'D':
1312 pcap_dump_type_features();
1313 die();
1314 break;
1315 case 'U':
1316 update_geoip();
1317 die();
1318 break;
1319 case 'v':
1320 version();
1321 break;
1322 case 'h':
1323 help();
1324 break;
1325 case '?':
1326 switch (optopt) {
1327 case 'd':
1328 case 'i':
1329 case 'o':
1330 case 'f':
1331 case 't':
1332 case 'P':
1333 case 'F':
1334 case 'n':
1335 case 'S':
1336 case 'b':
1337 case 'k':
1338 case 'T':
1339 case 'u':
1340 case 'g':
1341 case 'e':
1342 panic("Option -%c requires an argument!\n",
1343 optopt);
1344 default:
1345 if (isprint(optopt))
1346 printf("Unknown option character `0x%X\'!\n", optopt);
1347 die();
1348 }
1349 default:
1350 break;
1351 }
1352 }
1353
1354 if (!ctx.filter && optind != argc) {
1355 int ret;
1356 off_t offset = 0;
1357
1358 for (i = optind; i < argc; ++i) {
1359 size_t alen = strlen(argv[i]) + 2;
1360 size_t flen = ctx.filter ? strlen(ctx.filter) : 0;
1361
1362 ctx.filter = xrealloc(ctx.filter, 1, flen + alen);
1363 ret = slprintf(ctx.filter + offset, strlen(argv[i]) + 2, "%s ", argv[i]);
1364 if (ret < 0)
1365 panic("Cannot concatenate filter string!\n");
1366 else
1367 offset += ret;
1368 }
1369 }
1370
1371 if (!ctx.device_in)
1372 ctx.device_in = xstrdup("any");
1373
1374 register_signal(SIGINT, signal_handler);
1375 register_signal(SIGHUP, signal_handler);
1376
1377 tprintf_init();
1378
1379 if (prio_high) {
1380 set_proc_prio(-20);
1381 set_sched_status(SCHED_FIFO, sched_get_priority_max(SCHED_FIFO));
1382 }
1383
1384 if (ctx.device_in && (device_mtu(ctx.device_in) ||
1385 !strncmp("any", ctx.device_in, strlen(ctx.device_in)))) {
1386 if (!ctx.rfraw)
1387 ctx.link_type = pcap_devtype_to_linktype(ctx.device_in);
1388 if (!ctx.device_out) {
1389 ctx.dump = 0;
1390 main_loop = recv_only_or_dump;
1391 } else if (device_mtu(ctx.device_out)) {
1392 register_signal_f(SIGALRM, timer_elapsed, SA_SIGINFO);
1393 main_loop = receive_to_xmit;
1394 } else {
1395 ctx.dump = 1;
1396 register_signal_f(SIGALRM, timer_next_dump, SA_SIGINFO);
1397 main_loop = recv_only_or_dump;
1398 if (!ops_touched)
1399 ctx.pcap = PCAP_OPS_SG;
1400 }
1401 } else {
1402 if (ctx.device_out && device_mtu(ctx.device_out)) {
1403 register_signal_f(SIGALRM, timer_elapsed, SA_SIGINFO);
1404 main_loop = pcap_to_xmit;
1405 if (!ops_touched)
1406 ctx.pcap = PCAP_OPS_MM;
1407 } else {
1408 main_loop = read_pcap;
1409 if (!ops_touched)
1410 ctx.pcap = PCAP_OPS_SG;
1411 }
1412 }
1413
1414 bug_on(!main_loop);
1415
1416 init_geoip(0);
1417 if (setsockmem)
1418 set_system_socket_memory(vals, array_size(vals));
1419 if (!ctx.enforce)
1420 xlockme();
1421
1422 main_loop(&ctx);
1423
1424 if (!ctx.enforce)
1425 xunlockme();
1426 if (setsockmem)
1427 reset_system_socket_memory(vals, array_size(vals));
1428 destroy_geoip();
1429
1430 device_restore_irq_affinity_list();
1431 tprintf_cleanup();
1432
1433 destroy_ctx(&ctx);
1434 return 0;
1435 }
netsniff-ng toolkit, the packet sniffing beast, staging tree