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netsniff-ng: Show packet number
[netsniff-ng.git] / netsniff-ng.c
blob9655c597cf84983a315dd69467359e88cc75b07c
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 "dev.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;
58 unsigned long kpull, dump_interval, tx_bytes, tx_packets;
59 size_t reserve_size;
60 bool randomize, promiscuous, enforce, jumbo, dump_bpf, hwtimestamp, verbose;
61 enum pcap_ops_groups pcap;
62 enum dump_mode dump_mode;
63 uid_t uid;
64 gid_t gid;
65 uint32_t link_type, magic;
66 uint32_t fanout_group, fanout_type;
67 };
68
69 static volatile sig_atomic_t sigint = 0, sighup = 0;
70 static volatile bool next_dump = false;
71
72 static const char *short_options = "d:i:o:rf:MNJt:S:k:n:b:HQmcsqXlvhF:RGAP:Vu:g:T:DBUC:K:L:";
73 static const struct option long_options[] = {
74 {"dev", required_argument, NULL, 'd'},
75 {"in", required_argument, NULL, 'i'},
76 {"out", required_argument, NULL, 'o'},
77 {"filter", required_argument, NULL, 'f'},
78 {"num", required_argument, NULL, 'n'},
79 {"type", required_argument, NULL, 't'},
80 {"interval", required_argument, NULL, 'F'},
81 {"ring-size", required_argument, NULL, 'S'},
82 {"kernel-pull", required_argument, NULL, 'k'},
83 {"bind-cpu", required_argument, NULL, 'b'},
84 {"prefix", required_argument, NULL, 'P'},
85 {"user", required_argument, NULL, 'u'},
86 {"group", required_argument, NULL, 'g'},
87 {"magic", required_argument, NULL, 'T'},
88 {"fanout-group", required_argument, NULL, 'C'},
89 {"fanout-type", required_argument, NULL, 'K'},
90 {"fanout-opts", required_argument, NULL, 'L'},
91 {"rand", no_argument, NULL, 'r'},
92 {"rfraw", no_argument, NULL, 'R'},
93 {"mmap", no_argument, NULL, 'm'},
94 {"sg", no_argument, NULL, 'G'},
95 {"clrw", no_argument, NULL, 'c'},
96 {"jumbo-support", no_argument, NULL, 'J'},
97 {"no-promisc", no_argument, NULL, 'M'},
98 {"no-hwtimestamp", no_argument, NULL, 'N'},
99 {"prio-high", no_argument, NULL, 'H'},
100 {"notouch-irq", no_argument, NULL, 'Q'},
101 {"dump-pcap-types", no_argument, NULL, 'D'},
102 {"dump-bpf", no_argument, NULL, 'B'},
103 {"silent", no_argument, NULL, 's'},
104 {"less", no_argument, NULL, 'q'},
105 {"hex", no_argument, NULL, 'X'},
106 {"ascii", no_argument, NULL, 'l'},
107 {"no-sock-mem", no_argument, NULL, 'A'},
108 {"update", no_argument, NULL, 'U'},
109 {"verbose", no_argument, NULL, 'V'},
110 {"version", no_argument, NULL, 'v'},
111 {"help", no_argument, NULL, 'h'},
112 {NULL, 0, NULL, 0}
113 };
114
115 static const char *copyright = "Please report bugs to <bugs@netsniff-ng.org>\n"
116 "Copyright (C) 2009-2013 Daniel Borkmann <dborkma@tik.ee.ethz.ch>\n"
117 "Copyright (C) 2009-2012 Emmanuel Roullit <emmanuel.roullit@gmail.com>\n"
118 "Copyright (C) 2012 Markus Amend <markus@netsniff-ng.org>\n"
119 "Swiss federal institute of technology (ETH Zurich)\n"
120 "License: GNU GPL version 2.0\n"
121 "This is free software: you are free to change and redistribute it.\n"
122 "There is NO WARRANTY, to the extent permitted by law.";
123
124 static int tx_sock;
125 static struct itimerval itimer;
126 static unsigned long frame_count_max = 0, interval = TX_KERNEL_PULL_INT;
127
128 #define __pcap_io pcap_ops[ctx->pcap]
129
130 static void signal_handler(int number)
131 {
132 switch (number) {
133 case SIGINT:
134 case SIGQUIT:
135 case SIGTERM:
136 sigint = 1;
137 break;
138 case SIGHUP:
139 sighup = 1;
140 break;
141 default:
142 break;
143 }
144 }
145
146 static void timer_elapsed(int unused __maybe_unused)
147 {
148 int ret;
149
150 set_itimer_interval_value(&itimer, 0, interval);
151
152 ret = pull_and_flush_tx_ring(tx_sock);
153 if (unlikely(ret < 0)) {
154 /* We could hit EBADF if the socket has been closed before
155 * the timer was triggered.
156 */
157 if (errno != EBADF && errno != ENOBUFS)
158 panic("Flushing TX_RING failed: %s!\n", strerror(errno));
159 }
160
161 setitimer(ITIMER_REAL, &itimer, NULL);
162 }
163
164 static void timer_purge(void)
165 {
166 int ret;
167
168 ret = pull_and_flush_tx_ring_wait(tx_sock);
169 if (unlikely(ret < 0)) {
170 if (errno != EBADF && errno != ENOBUFS)
171 panic("Flushing TX_RING failed: %s!\n", strerror(errno));
172 }
173
174 set_itimer_interval_value(&itimer, 0, 0);
175 setitimer(ITIMER_REAL, &itimer, NULL);
176 }
177
178 static void timer_next_dump(int unused __maybe_unused)
179 {
180 set_itimer_interval_value(&itimer, interval, 0);
181 next_dump = true;
182 setitimer(ITIMER_REAL, &itimer, NULL);
183 }
184
185 static inline bool dump_to_pcap(struct ctx *ctx)
186 {
187 return ctx->dump;
188 }
189
190 static void on_panic_del_rfmon(void *arg)
191 {
192 leave_rfmon_mac80211(arg);
193 }
194
195 static inline void setup_rfmon_mac80211_dev(struct ctx *ctx, char **rfmon_dev)
196 {
197 ctx->device_trans = xstrdup(*rfmon_dev);
198 xfree(*rfmon_dev);
199
200 enter_rfmon_mac80211(ctx->device_trans, rfmon_dev);
201 panic_func_add(on_panic_del_rfmon, *rfmon_dev);
202 }
203
204 static void pcap_to_xmit(struct ctx *ctx)
205 {
206 uint8_t *out = NULL;
207 int ifindex, fd = 0, ret;
208 size_t size;
209 unsigned int it = 0;
210 unsigned long trunced = 0;
211 struct ring tx_ring;
212 struct frame_map *hdr;
213 struct sock_fprog bpf_ops;
214 struct timeval start, end, diff;
215 pcap_pkthdr_t phdr;
216
217 if (!device_up_and_running(ctx->device_out) && !ctx->rfraw)
218 panic("Device not up and running!\n");
219
220 bug_on(!__pcap_io);
221
222 tx_sock = pf_socket();
223
224 if (!strncmp("-", ctx->device_in, strlen("-"))) {
225 fd = dup_or_die(fileno(stdin));
226 close(fileno(stdin));
227 if (ctx->pcap == PCAP_OPS_MM)
228 ctx->pcap = PCAP_OPS_SG;
229 } else {
230 fd = open_or_die(ctx->device_in, O_RDONLY | O_LARGEFILE | O_NOATIME);
231 }
232
233 if (__pcap_io->init_once_pcap)
234 __pcap_io->init_once_pcap(true);
235
236 ret = __pcap_io->pull_fhdr_pcap(fd, &ctx->magic, &ctx->link_type);
237 if (ret)
238 panic("Error reading pcap header!\n");
239
240 if (__pcap_io->prepare_access_pcap) {
241 ret = __pcap_io->prepare_access_pcap(fd, PCAP_MODE_RD, ctx->jumbo);
242 if (ret)
243 panic("Error prepare reading pcap!\n");
244 }
245
246 if (ctx->rfraw) {
247 setup_rfmon_mac80211_dev(ctx, &ctx->device_out);
248
249 if (ctx->link_type != LINKTYPE_IEEE802_11 &&
250 ctx->link_type != LINKTYPE_IEEE802_11_RADIOTAP)
251 panic("Wrong linktype of pcap!\n");
252 }
253
254 ifindex = device_ifindex(ctx->device_out);
255 size = ring_size(ctx->device_out, ctx->reserve_size);
256
257 bpf_parse_rules(ctx->filter, &bpf_ops, ctx->link_type);
258 if (ctx->dump_bpf)
259 bpf_dump_all(&bpf_ops);
260
261 ring_tx_setup(&tx_ring, tx_sock, size, ifindex, ctx->jumbo, ctx->verbose);
262
263 dissector_init_all(ctx->print_mode);
264
265 if (ctx->cpu >= 0 && ifindex > 0) {
266 int irq = device_irq_number(ctx->device_out);
267 device_set_irq_affinity(irq, ctx->cpu);
268
269 if (ctx->verbose)
270 printf("IRQ: %s:%d > CPU%d\n",
271 ctx->device_out, irq, ctx->cpu);
272 }
273
274 if (ctx->kpull)
275 interval = ctx->kpull;
276
277 set_itimer_interval_value(&itimer, 0, interval);
278 setitimer(ITIMER_REAL, &itimer, NULL);
279
280 drop_privileges(ctx->enforce, ctx->uid, ctx->gid);
281
282 printf("Running! Hang up with ^C!\n\n");
283 fflush(stdout);
284
285 bug_on(gettimeofday(&start, NULL));
286
287 while (likely(sigint == 0)) {
288 while (user_may_pull_from_tx(tx_ring.frames[it].iov_base)) {
289 hdr = tx_ring.frames[it].iov_base;
290 out = ((uint8_t *) hdr) + TPACKET2_HDRLEN - sizeof(struct sockaddr_ll);
291
292 do {
293 ret = __pcap_io->read_pcap(fd, &phdr, ctx->magic, out,
294 ring_frame_size(&tx_ring));
295 if (unlikely(ret <= 0))
296 goto out;
297
298 if (ring_frame_size(&tx_ring) <
299 pcap_get_length(&phdr, ctx->magic)) {
300 pcap_set_length(&phdr, ctx->magic,
301 ring_frame_size(&tx_ring));
302 trunced++;
303 }
304 } while (ctx->filter &&
305 !bpf_run_filter(&bpf_ops, out,
306 pcap_get_length(&phdr, ctx->magic)));
307
308 pcap_pkthdr_to_tpacket_hdr(&phdr, ctx->magic, &hdr->tp_h, NULL);
309
310 ctx->tx_bytes += hdr->tp_h.tp_len;;
311 ctx->tx_packets++;
312
313 show_frame_hdr(out, hdr->tp_h.tp_snaplen,
314 ctx->link_type, hdr, ctx->print_mode,
315 ctx->tx_packets);
316
317 dissector_entry_point(out, hdr->tp_h.tp_snaplen,
318 ctx->link_type, ctx->print_mode,
319 hdr->s_ll.sll_protocol);
320
321 kernel_may_pull_from_tx(&hdr->tp_h);
322
323 it++;
324 if (it >= tx_ring.layout.tp_frame_nr)
325 it = 0;
326
327 if (unlikely(sigint == 1))
328 break;
329
330 if (frame_count_max != 0) {
331 if (ctx->tx_packets >= frame_count_max) {
332 sigint = 1;
333 break;
334 }
335 }
336 }
337 }
338
339 out:
340 bug_on(gettimeofday(&end, NULL));
341 timersub(&end, &start, &diff);
342
343 timer_purge();
344
345 bpf_release(&bpf_ops);
346
347 dissector_cleanup_all();
348 destroy_tx_ring(tx_sock, &tx_ring);
349
350 if (ctx->rfraw)
351 leave_rfmon_mac80211(ctx->device_out);
352
353 if (__pcap_io->prepare_close_pcap)
354 __pcap_io->prepare_close_pcap(fd, PCAP_MODE_RD);
355
356 if (!strncmp("-", ctx->device_in, strlen("-")))
357 dup2(fd, fileno(stdin));
358 close(fd);
359
360 close(tx_sock);
361
362 fflush(stdout);
363 printf("\n");
364 printf("\r%12lu packets outgoing\n", ctx->tx_packets);
365 printf("\r%12lu packets truncated in file\n", trunced);
366 printf("\r%12lu bytes outgoing\n", ctx->tx_bytes);
367 printf("\r%12lu sec, %lu usec in total\n", diff.tv_sec, diff.tv_usec);
368 }
369
370 static void receive_to_xmit(struct ctx *ctx)
371 {
372 short ifflags = 0;
373 uint8_t *in, *out;
374 int rx_sock, ifindex_in, ifindex_out, ret;
375 size_t size_in, size_out;
376 unsigned int it_in = 0, it_out = 0;
377 unsigned long frame_count = 0;
378 struct frame_map *hdr_in, *hdr_out;
379 struct ring tx_ring, rx_ring;
380 struct pollfd rx_poll;
381 struct sock_fprog bpf_ops;
382
383 if (!strncmp(ctx->device_in, ctx->device_out, IFNAMSIZ))
384 panic("Ingress/egress devices must be different!\n");
385 if (!device_up_and_running(ctx->device_out))
386 panic("Egress device not up and running!\n");
387
388 rx_sock = pf_socket();
389 tx_sock = pf_socket();
390
391 ifindex_in = device_ifindex(ctx->device_in);
392 ifindex_out = device_ifindex(ctx->device_out);
393
394 size_in = ring_size(ctx->device_in, ctx->reserve_size);
395 size_out = ring_size(ctx->device_out, ctx->reserve_size);
396
397 enable_kernel_bpf_jit_compiler();
398
399 bpf_parse_rules(ctx->filter, &bpf_ops, ctx->link_type);
400 if (ctx->dump_bpf)
401 bpf_dump_all(&bpf_ops);
402 bpf_attach_to_sock(rx_sock, &bpf_ops);
403
404 ring_rx_setup(&rx_ring, rx_sock, size_in, ifindex_in, &rx_poll, false, ctx->jumbo,
405 ctx->verbose, ctx->fanout_group, ctx->fanout_type);
406 ring_tx_setup(&tx_ring, tx_sock, size_out, ifindex_out, ctx->jumbo, ctx->verbose);
407
408 dissector_init_all(ctx->print_mode);
409
410 if (ctx->promiscuous)
411 ifflags = device_enter_promiscuous_mode(ctx->device_in);
412
413 if (ctx->kpull)
414 interval = ctx->kpull;
415
416 set_itimer_interval_value(&itimer, 0, interval);
417 setitimer(ITIMER_REAL, &itimer, NULL);
418
419 drop_privileges(ctx->enforce, ctx->uid, ctx->gid);
420
421 printf("Running! Hang up with ^C!\n\n");
422 fflush(stdout);
423
424 while (likely(sigint == 0)) {
425 while (user_may_pull_from_rx(rx_ring.frames[it_in].iov_base)) {
426 hdr_in = rx_ring.frames[it_in].iov_base;
427 in = ((uint8_t *) hdr_in) + hdr_in->tp_h.tp_mac;
428
429 frame_count++;
430
431 if (ctx->packet_type != -1)
432 if (ctx->packet_type != hdr_in->s_ll.sll_pkttype)
433 goto next;
434
435 hdr_out = tx_ring.frames[it_out].iov_base;
436 out = ((uint8_t *) hdr_out) + TPACKET2_HDRLEN - sizeof(struct sockaddr_ll);
437
438 while (!user_may_pull_from_tx(tx_ring.frames[it_out].iov_base) &&
439 likely(!sigint)) {
440 if (ctx->randomize)
441 next_rnd_slot(&it_out, &tx_ring);
442 else {
443 it_out++;
444 if (it_out >= tx_ring.layout.tp_frame_nr)
445 it_out = 0;
446 }
447
448 hdr_out = tx_ring.frames[it_out].iov_base;
449 out = ((uint8_t *) hdr_out) + TPACKET2_HDRLEN - sizeof(struct sockaddr_ll);
450 }
451
452 tpacket_hdr_clone(&hdr_out->tp_h, &hdr_in->tp_h);
453 fmemcpy(out, in, hdr_in->tp_h.tp_len);
454
455 kernel_may_pull_from_tx(&hdr_out->tp_h);
456 if (ctx->randomize)
457 next_rnd_slot(&it_out, &tx_ring);
458 else {
459 it_out++;
460 if (it_out >= tx_ring.layout.tp_frame_nr)
461 it_out = 0;
462 }
463
464 show_frame_hdr(in, hdr_in->tp_h.tp_snaplen,
465 ctx->link_type, hdr_in, ctx->print_mode,
466 frame_count);
467
468 dissector_entry_point(in, hdr_in->tp_h.tp_snaplen,
469 ctx->link_type, ctx->print_mode,
470 hdr_in->s_ll.sll_protocol);
471
472 if (frame_count_max != 0) {
473 if (frame_count >= frame_count_max) {
474 sigint = 1;
475 break;
476 }
477 }
478
479 next:
480 kernel_may_pull_from_rx(&hdr_in->tp_h);
481
482 it_in++;
483 if (it_in >= rx_ring.layout.tp_frame_nr)
484 it_in = 0;
485
486 if (unlikely(sigint == 1))
487 goto out;
488 }
489
490 ret = poll(&rx_poll, 1, -1);
491 if (unlikely(ret < 0)) {
492 if (errno != EINTR)
493 panic("Poll failed!\n");
494 }
495 }
496
497 out:
498 timer_purge();
499
500 sock_rx_net_stats(rx_sock, 0);
501
502 bpf_release(&bpf_ops);
503
504 dissector_cleanup_all();
505
506 destroy_tx_ring(tx_sock, &tx_ring);
507 destroy_rx_ring(rx_sock, &rx_ring);
508
509 if (ctx->promiscuous)
510 device_leave_promiscuous_mode(ctx->device_in, ifflags);
511
512 close(tx_sock);
513 close(rx_sock);
514 }
515
516 static void translate_pcap_to_txf(int fdo, uint8_t *out, size_t len)
517 {
518 size_t bytes_done = 0;
519 char bout[80];
520
521 slprintf(bout, sizeof(bout), "{\n ");
522 write_or_die(fdo, bout, strlen(bout));
523
524 while (bytes_done < len) {
525 slprintf(bout, sizeof(bout), "0x%02x,", out[bytes_done]);
526 write_or_die(fdo, bout, strlen(bout));
527
528 bytes_done++;
529
530 if (bytes_done % 10 == 0) {
531 slprintf(bout, sizeof(bout), "\n");
532 write_or_die(fdo, bout, strlen(bout));
533
534 if (bytes_done < len) {
535 slprintf(bout, sizeof(bout), " ");
536 write_or_die(fdo, bout, strlen(bout));
537 }
538 } else if (bytes_done < len) {
539 slprintf(bout, sizeof(bout), " ");
540 write_or_die(fdo, bout, strlen(bout));
541 }
542 }
543 if (bytes_done % 10 != 0) {
544 slprintf(bout, sizeof(bout), "\n");
545 write_or_die(fdo, bout, strlen(bout));
546 }
547
548 slprintf(bout, sizeof(bout), "}\n\n");
549 write_or_die(fdo, bout, strlen(bout));
550 }
551
552 static void read_pcap(struct ctx *ctx)
553 {
554 uint8_t *out;
555 int ret, fd, fdo = 0;
556 unsigned long trunced = 0;
557 size_t out_len;
558 pcap_pkthdr_t phdr;
559 struct sock_fprog bpf_ops;
560 struct frame_map fm;
561 struct timeval start, end, diff;
562 bool is_out_pcap = ctx->device_out && strstr(ctx->device_out, ".pcap");
563 const struct pcap_file_ops *pcap_out_ops = pcap_ops[PCAP_OPS_RW];
564
565 bug_on(!__pcap_io);
566
567 if (!strncmp("-", ctx->device_in, strlen("-"))) {
568 fd = dup_or_die(fileno(stdin));
569 close(fileno(stdin));
570 if (ctx->pcap == PCAP_OPS_MM)
571 ctx->pcap = PCAP_OPS_SG;
572 } else {
573 fd = open_or_die(ctx->device_in, O_RDONLY | O_LARGEFILE | O_NOATIME);
574 }
575
576 if (__pcap_io->init_once_pcap)
577 __pcap_io->init_once_pcap(false);
578
579 ret = __pcap_io->pull_fhdr_pcap(fd, &ctx->magic, &ctx->link_type);
580 if (ret)
581 panic("Error reading pcap header!\n");
582
583 if (__pcap_io->prepare_access_pcap) {
584 ret = __pcap_io->prepare_access_pcap(fd, PCAP_MODE_RD, ctx->jumbo);
585 if (ret)
586 panic("Error prepare reading pcap!\n");
587 }
588
589 fmemset(&fm, 0, sizeof(fm));
590
591 bpf_parse_rules(ctx->filter, &bpf_ops, ctx->link_type);
592 if (ctx->dump_bpf)
593 bpf_dump_all(&bpf_ops);
594
595 dissector_init_all(ctx->print_mode);
596
597 out_len = round_up(1024 * 1024, RUNTIME_PAGE_SIZE);
598 out = xmalloc_aligned(out_len, CO_CACHE_LINE_SIZE);
599
600 if (ctx->device_out) {
601 if (!strncmp("-", ctx->device_out, strlen("-"))) {
602 fdo = dup_or_die(fileno(stdout));
603 close(fileno(stdout));
604 } else {
605 fdo = open_or_die_m(ctx->device_out, O_RDWR | O_CREAT |
606 O_TRUNC | O_LARGEFILE, DEFFILEMODE);
607 }
608 }
609
610 if (is_out_pcap) {
611 ret = pcap_out_ops->push_fhdr_pcap(fdo, ctx->magic,
612 ctx->link_type);
613 if (ret)
614 panic("Error writing pcap header!\n");
615 }
616
617 drop_privileges(ctx->enforce, ctx->uid, ctx->gid);
618
619 printf("Running! Hang up with ^C!\n\n");
620 fflush(stdout);
621
622 bug_on(gettimeofday(&start, NULL));
623
624 while (likely(sigint == 0)) {
625 do {
626 ret = __pcap_io->read_pcap(fd, &phdr, ctx->magic,
627 out, out_len);
628 if (unlikely(ret < 0))
629 goto out;
630
631 if (unlikely(pcap_get_length(&phdr, ctx->magic) == 0)) {
632 trunced++;
633 continue;
634 }
635
636 if (unlikely(pcap_get_length(&phdr, ctx->magic) > out_len)) {
637 pcap_set_length(&phdr, ctx->magic, out_len);
638 trunced++;
639 }
640 } while (ctx->filter &&
641 !bpf_run_filter(&bpf_ops, out,
642 pcap_get_length(&phdr, ctx->magic)));
643
644 pcap_pkthdr_to_tpacket_hdr(&phdr, ctx->magic, &fm.tp_h, &fm.s_ll);
645
646 ctx->tx_bytes += fm.tp_h.tp_len;
647 ctx->tx_packets++;
648
649 show_frame_hdr(out, fm.tp_h.tp_snaplen, ctx->link_type, &fm,
650 ctx->print_mode, ctx->tx_packets);
651
652 dissector_entry_point(out, fm.tp_h.tp_snaplen,
653 ctx->link_type, ctx->print_mode,
654 fm.s_ll.sll_protocol);
655
656 if (is_out_pcap) {
657 size_t pcap_len = pcap_get_length(&phdr, ctx->magic);
658 int wlen = pcap_out_ops->write_pcap(fdo, &phdr,
659 ctx->magic, out,
660 pcap_len);
661 if (unlikely(wlen != (int)pcap_get_total_length(&phdr, ctx->magic)))
662 panic("Error writing to pcap!\n");
663 } else if (ctx->device_out) {
664 translate_pcap_to_txf(fdo, out, fm.tp_h.tp_snaplen);
665 }
666
667 if (frame_count_max != 0) {
668 if (ctx->tx_packets >= frame_count_max) {
669 sigint = 1;
670 break;
671 }
672 }
673 }
674
675 out:
676 bug_on(gettimeofday(&end, NULL));
677 timersub(&end, &start, &diff);
678
679 bpf_release(&bpf_ops);
680
681 dissector_cleanup_all();
682
683 if (__pcap_io->prepare_close_pcap)
684 __pcap_io->prepare_close_pcap(fd, PCAP_MODE_RD);
685
686 xfree(out);
687
688 fflush(stdout);
689 printf("\n");
690 printf("\r%12lu packets outgoing\n", ctx->tx_packets);
691 printf("\r%12lu packets truncated in file\n", trunced);
692 printf("\r%12lu bytes outgoing\n", ctx->tx_bytes);
693 printf("\r%12lu sec, %lu usec in total\n", diff.tv_sec, diff.tv_usec);
694
695 if (!strncmp("-", ctx->device_in, strlen("-")))
696 dup2(fd, fileno(stdin));
697 close(fd);
698
699 if (ctx->device_out) {
700 if (!strncmp("-", ctx->device_out, strlen("-")))
701 dup2(fdo, fileno(stdout));
702 close(fdo);
703 }
704 }
705
706 static void finish_multi_pcap_file(struct ctx *ctx, int fd)
707 {
708 __pcap_io->fsync_pcap(fd);
709
710 if (__pcap_io->prepare_close_pcap)
711 __pcap_io->prepare_close_pcap(fd, PCAP_MODE_WR);
712
713 close(fd);
714
715 fmemset(&itimer, 0, sizeof(itimer));
716 setitimer(ITIMER_REAL, &itimer, NULL);
717 }
718
719 static int next_multi_pcap_file(struct ctx *ctx, int fd)
720 {
721 int ret;
722 char fname[512];
723
724 __pcap_io->fsync_pcap(fd);
725
726 if (__pcap_io->prepare_close_pcap)
727 __pcap_io->prepare_close_pcap(fd, PCAP_MODE_WR);
728
729 close(fd);
730
731 slprintf(fname, sizeof(fname), "%s/%s%lu.pcap", ctx->device_out,
732 ctx->prefix ? : "dump-", time(NULL));
733
734 fd = open_or_die_m(fname, O_RDWR | O_CREAT | O_TRUNC |
735 O_LARGEFILE, DEFFILEMODE);
736
737 ret = __pcap_io->push_fhdr_pcap(fd, ctx->magic, ctx->link_type);
738 if (ret)
739 panic("Error writing pcap header!\n");
740
741 if (__pcap_io->prepare_access_pcap) {
742 ret = __pcap_io->prepare_access_pcap(fd, PCAP_MODE_WR, true);
743 if (ret)
744 panic("Error prepare writing pcap!\n");
745 }
746
747 return fd;
748 }
749
750 static void reset_interval(struct ctx *ctx)
751 {
752 if (ctx->dump_mode == DUMP_INTERVAL_TIME) {
753 interval = ctx->dump_interval;
754
755 set_itimer_interval_value(&itimer, interval, 0);
756 setitimer(ITIMER_REAL, &itimer, NULL);
757 } else {
758 interval = 0;
759 }
760 }
761
762 static int begin_multi_pcap_file(struct ctx *ctx)
763 {
764 int fd, ret;
765 char fname[256];
766
767 bug_on(!__pcap_io);
768
769 if (ctx->device_out[strlen(ctx->device_out) - 1] == '/')
770 ctx->device_out[strlen(ctx->device_out) - 1] = 0;
771
772 slprintf(fname, sizeof(fname), "%s/%s%lu.pcap", ctx->device_out,
773 ctx->prefix ? : "dump-", time(NULL));
774
775 fd = open_or_die_m(fname, O_RDWR | O_CREAT | O_TRUNC |
776 O_LARGEFILE, DEFFILEMODE);
777
778 ret = __pcap_io->push_fhdr_pcap(fd, ctx->magic, ctx->link_type);
779 if (ret)
780 panic("Error writing pcap header!\n");
781
782 if (__pcap_io->prepare_access_pcap) {
783 ret = __pcap_io->prepare_access_pcap(fd, PCAP_MODE_WR, true);
784 if (ret)
785 panic("Error prepare writing pcap!\n");
786 }
787
788 reset_interval(ctx);
789
790 return fd;
791 }
792
793 static void finish_single_pcap_file(struct ctx *ctx, int fd)
794 {
795 __pcap_io->fsync_pcap(fd);
796
797 if (__pcap_io->prepare_close_pcap)
798 __pcap_io->prepare_close_pcap(fd, PCAP_MODE_WR);
799
800 if (strncmp("-", ctx->device_out, strlen("-")))
801 close(fd);
802 else
803 dup2(fd, fileno(stdout));
804 }
805
806 static int begin_single_pcap_file(struct ctx *ctx)
807 {
808 int fd, ret;
809
810 bug_on(!__pcap_io);
811
812 if (!strncmp("-", ctx->device_out, strlen("-"))) {
813 fd = dup_or_die(fileno(stdout));
814 close(fileno(stdout));
815 if (ctx->pcap == PCAP_OPS_MM)
816 ctx->pcap = PCAP_OPS_SG;
817 } else {
818 fd = open_or_die_m(ctx->device_out,
819 O_RDWR | O_CREAT | O_TRUNC |
820 O_LARGEFILE, DEFFILEMODE);
821 }
822
823 ret = __pcap_io->push_fhdr_pcap(fd, ctx->magic, ctx->link_type);
824 if (ret)
825 panic("Error writing pcap header!\n");
826
827 if (__pcap_io->prepare_access_pcap) {
828 ret = __pcap_io->prepare_access_pcap(fd, PCAP_MODE_WR, true);
829 if (ret)
830 panic("Error prepare writing pcap!\n");
831 }
832
833 return fd;
834 }
835
836 static void print_pcap_file_stats(int sock, struct ctx *ctx)
837 {
838 int ret;
839 struct tpacket_stats kstats;
840 socklen_t slen = sizeof(kstats);
841
842 fmemset(&kstats, 0, sizeof(kstats));
843
844 ret = getsockopt(sock, SOL_PACKET, PACKET_STATISTICS, &kstats, &slen);
845 if (unlikely(ret))
846 panic("Cannot get packet statistics!\n");
847
848 if (ctx->print_mode == PRINT_NONE) {
849 printf(".(+%u/-%u)", kstats.tp_packets - kstats.tp_drops,
850 kstats.tp_drops);
851 fflush(stdout);
852 }
853 }
854
855 static void update_pcap_next_dump(struct ctx *ctx, unsigned long snaplen, int *fd, int sock)
856 {
857 if (!dump_to_pcap(ctx))
858 return;
859
860 if (ctx->dump_mode == DUMP_INTERVAL_SIZE) {
861 interval += snaplen;
862 if (interval > ctx->dump_interval) {
863 next_dump = true;
864 interval = 0;
865 }
866 }
867
868 if (sighup) {
869 if (ctx->verbose)
870 printf("SIGHUP received, prematurely rotating pcap\n");
871 sighup = 0;
872 next_dump = true;
873 reset_interval(ctx);
874 }
875
876 if (next_dump) {
877 *fd = next_multi_pcap_file(ctx, *fd);
878 next_dump = false;
879
880 if (ctx->verbose)
881 print_pcap_file_stats(sock, ctx);
882 }
883 }
884
885 #ifdef HAVE_TPACKET3
886 static void walk_t3_block(struct block_desc *pbd, struct ctx *ctx,
887 int sock, int *fd, unsigned long *frame_count)
888 {
889 int num_pkts = pbd->h1.num_pkts, i;
890 struct tpacket3_hdr *hdr;
891 struct sockaddr_ll *sll;
892
893 hdr = (void *) ((uint8_t *) pbd + pbd->h1.offset_to_first_pkt);
894 sll = (void *) ((uint8_t *) hdr + TPACKET_ALIGN(sizeof(*hdr)));
895
896 for (i = 0; i < num_pkts && likely(sigint == 0); ++i) {
897 uint8_t *packet = ((uint8_t *) hdr + hdr->tp_mac);
898 pcap_pkthdr_t phdr;
899
900 if (ctx->packet_type != -1)
901 if (ctx->packet_type != sll->sll_pkttype)
902 goto next;
903
904 (*frame_count)++;
905
906 if (dump_to_pcap(ctx)) {
907 int ret;
908
909 tpacket3_hdr_to_pcap_pkthdr(hdr, sll, &phdr, ctx->magic);
910
911 ret = __pcap_io->write_pcap(*fd, &phdr, ctx->magic, packet,
912 pcap_get_length(&phdr, ctx->magic));
913 if (unlikely(ret != (int) pcap_get_total_length(&phdr, ctx->magic)))
914 panic("Write error to pcap!\n");
915 }
916
917 __show_frame_hdr(packet, hdr->tp_snaplen, ctx->link_type, sll,
918 hdr, ctx->print_mode, true, *frame_count);
919
920 dissector_entry_point(packet, hdr->tp_snaplen, ctx->link_type,
921 ctx->print_mode, sll->sll_protocol);
922 next:
923 hdr = (void *) ((uint8_t *) hdr + hdr->tp_next_offset);
924 sll = (void *) ((uint8_t *) hdr + TPACKET_ALIGN(sizeof(*hdr)));
925
926 if (frame_count_max != 0) {
927 if (unlikely(*frame_count >= frame_count_max)) {
928 sigint = 1;
929 break;
930 }
931 }
932
933 update_pcap_next_dump(ctx, hdr->tp_snaplen, fd, sock);
934 }
935 }
936 #endif /* HAVE_TPACKET3 */
937
938 static void recv_only_or_dump(struct ctx *ctx)
939 {
940 short ifflags = 0;
941 int sock, ifindex, fd = 0, ret;
942 size_t size;
943 unsigned int it = 0;
944 struct ring rx_ring;
945 struct pollfd rx_poll;
946 struct sock_fprog bpf_ops;
947 struct timeval start, end, diff;
948 unsigned long frame_count = 0;
949
950 sock = pf_socket();
951
952 ifindex = device_ifindex(ctx->device_in);
953
954 size = ring_size(ctx->device_in, ctx->reserve_size);
955
956 enable_kernel_bpf_jit_compiler();
957
958 bpf_parse_rules(ctx->filter, &bpf_ops, ctx->link_type);
959 if (ctx->dump_bpf)
960 bpf_dump_all(&bpf_ops);
961 bpf_attach_to_sock(sock, &bpf_ops);
962
963 if (ctx->hwtimestamp) {
964 ret = set_sockopt_hwtimestamp(sock, ctx->device_in);
965 if (ret == 0 && ctx->verbose)
966 printf("HW timestamping enabled\n");
967 }
968
969 ring_rx_setup(&rx_ring, sock, size, ifindex, &rx_poll, is_defined(HAVE_TPACKET3), true,
970 ctx->verbose, ctx->fanout_group, ctx->fanout_type);
971
972 dissector_init_all(ctx->print_mode);
973
974 if (ctx->cpu >= 0 && ifindex > 0) {
975 int irq = device_irq_number(ctx->device_in);
976 device_set_irq_affinity(irq, ctx->cpu);
977
978 if (ctx->verbose)
979 printf("IRQ: %s:%d > CPU%d\n",
980 ctx->device_in, irq, ctx->cpu);
981 }
982
983 if (ctx->promiscuous)
984 ifflags = device_enter_promiscuous_mode(ctx->device_in);
985
986 if (dump_to_pcap(ctx) && __pcap_io->init_once_pcap)
987 __pcap_io->init_once_pcap(true);
988
989 drop_privileges(ctx->enforce, ctx->uid, ctx->gid);
990
991 if (dump_to_pcap(ctx)) {
992 struct stat stats;
993
994 ret = stat(ctx->device_out, &stats);
995 if (ret < 0)
996 ctx->dump_dir = 0;
997 else
998 ctx->dump_dir = S_ISDIR(stats.st_mode);
999
1000 if (ctx->dump_dir)
1001 fd = begin_multi_pcap_file(ctx);
1002 else
1003 fd = begin_single_pcap_file(ctx);
1004 }
1005
1006 printf("Running! Hang up with ^C!\n\n");
1007 fflush(stdout);
1008
1009 bug_on(gettimeofday(&start, NULL));
1010
1011 while (likely(sigint == 0)) {
1012 #ifdef HAVE_TPACKET3
1013 struct block_desc *pbd;
1014
1015 while (user_may_pull_from_rx_block((pbd = rx_ring.frames[it].iov_base))) {
1016 walk_t3_block(pbd, ctx, sock, &fd, &frame_count);
1017
1018 kernel_may_pull_from_rx_block(pbd);
1019 it = (it + 1) % rx_ring.layout3.tp_block_nr;
1020
1021 if (unlikely(sigint == 1))
1022 break;
1023 }
1024 #else
1025 while (user_may_pull_from_rx(rx_ring.frames[it].iov_base)) {
1026 struct frame_map *hdr = rx_ring.frames[it].iov_base;
1027 uint8_t *packet = ((uint8_t *) hdr) + hdr->tp_h.tp_mac;
1028 pcap_pkthdr_t phdr;
1029
1030 if (ctx->packet_type != -1)
1031 if (ctx->packet_type != hdr->s_ll.sll_pkttype)
1032 goto next;
1033
1034 frame_count++;
1035
1036 if (unlikely(ring_frame_size(&rx_ring) < hdr->tp_h.tp_snaplen)) {
1037 /* XXX: silently ignore for now. We used to
1038 * report them with sock_rx_net_stats() */
1039 goto next;
1040 }
1041
1042 if (dump_to_pcap(ctx)) {
1043 tpacket_hdr_to_pcap_pkthdr(&hdr->tp_h, &hdr->s_ll, &phdr, ctx->magic);
1044
1045 ret = __pcap_io->write_pcap(fd, &phdr, ctx->magic, packet,
1046 pcap_get_length(&phdr, ctx->magic));
1047 if (unlikely(ret != (int) pcap_get_total_length(&phdr, ctx->magic)))
1048 panic("Write error to pcap!\n");
1049 }
1050
1051 show_frame_hdr(packet, hdr->tp_h.tp_snaplen,
1052 ctx->link_type, hdr, ctx->print_mode,
1053 frame_count);
1054
1055 dissector_entry_point(packet, hdr->tp_h.tp_snaplen,
1056 ctx->link_type, ctx->print_mode,
1057 hdr->s_ll.sll_protocol);
1058
1059 if (frame_count_max != 0) {
1060 if (unlikely(frame_count >= frame_count_max)) {
1061 sigint = 1;
1062 break;
1063 }
1064 }
1065
1066 next:
1067 kernel_may_pull_from_rx(&hdr->tp_h);
1068 it = (it + 1) % rx_ring.layout.tp_frame_nr;
1069
1070 if (unlikely(sigint == 1))
1071 break;
1072
1073 update_pcap_next_dump(ctx, hdr->tp_h.tp_snaplen, &fd, sock);
1074 }
1075 #endif /* HAVE_TPACKET3 */
1076
1077 ret = poll(&rx_poll, 1, -1);
1078 if (unlikely(ret < 0)) {
1079 if (errno != EINTR)
1080 panic("Poll failed!\n");
1081 }
1082 }
1083
1084 bug_on(gettimeofday(&end, NULL));
1085 timersub(&end, &start, &diff);
1086
1087 if (!(ctx->dump_dir && ctx->print_mode == PRINT_NONE)) {
1088 sock_rx_net_stats(sock, frame_count);
1089
1090 printf("\r%12lu sec, %lu usec in total\n",
1091 diff.tv_sec, diff.tv_usec);
1092 } else {
1093 printf("\n\n");
1094 fflush(stdout);
1095 }
1096
1097 bpf_release(&bpf_ops);
1098 dissector_cleanup_all();
1099 destroy_rx_ring(sock, &rx_ring);
1100
1101 if (ctx->promiscuous)
1102 device_leave_promiscuous_mode(ctx->device_in, ifflags);
1103
1104 if (ctx->rfraw)
1105 leave_rfmon_mac80211(ctx->device_in);
1106
1107 if (dump_to_pcap(ctx)) {
1108 if (ctx->dump_dir)
1109 finish_multi_pcap_file(ctx, fd);
1110 else
1111 finish_single_pcap_file(ctx, fd);
1112 }
1113
1114 close(sock);
1115 }
1116
1117 static void init_ctx(struct ctx *ctx)
1118 {
1119 memset(ctx, 0, sizeof(*ctx));
1120
1121 ctx->uid = getuid();
1122 ctx->gid = getgid();
1123
1124 ctx->cpu = -1;
1125 ctx->packet_type = -1;
1126
1127 ctx->fanout_type = PACKET_FANOUT_ROLLOVER;
1128
1129 ctx->magic = ORIGINAL_TCPDUMP_MAGIC;
1130 ctx->print_mode = PRINT_NORM;
1131 ctx->pcap = PCAP_OPS_SG;
1132
1133 ctx->dump_mode = DUMP_INTERVAL_TIME;
1134 ctx->dump_interval = 60;
1135
1136 ctx->promiscuous = true;
1137 ctx->randomize = false;
1138 ctx->hwtimestamp = true;
1139 }
1140
1141 static void destroy_ctx(struct ctx *ctx)
1142 {
1143 free(ctx->device_in);
1144 free(ctx->device_out);
1145 free(ctx->device_trans);
1146
1147 free(ctx->prefix);
1148 }
1149
1150 static void __noreturn help(void)
1151 {
1152 printf("netsniff-ng %s, the packet sniffing beast\n", VERSION_STRING);
1153 puts("http://www.netsniff-ng.org\n\n"
1154 "Usage: netsniff-ng [options] [filter-expression]\n"
1155 "Options:\n"
1156 " -i|-d|--dev|--in <dev|pcap|-> Input source as netdev, pcap or pcap stdin\n"
1157 " -o|--out <dev|pcap|dir|cfg|-> Output sink as netdev, pcap, directory, trafgen, or stdout\n"
1158 " -C|--fanout-group <id> Join packet fanout group\n"
1159 " -K|--fanout-type <type> Apply fanout discipline: hash|lb|cpu|rnd|roll|qm\n"
1160 " -L|--fanout-opts <opts> Additional fanout options: defrag|roll\n"
1161 " -f|--filter <bpf-file|expr> Use BPF filter file from bpfc or tcpdump-like expression\n"
1162 " -t|--type <type> Filter for: host|broadcast|multicast|others|outgoing\n"
1163 " -F|--interval <size|time> Dump interval if -o is a dir: <num>KiB/MiB/GiB/s/sec/min/hrs\n"
1164 " -R|--rfraw Capture or inject raw 802.11 frames\n"
1165 " -n|--num <0|uint> Number of packets until exit (def: 0)\n"
1166 " -P|--prefix <name> Prefix for pcaps stored in directory\n"
1167 " -T|--magic <pcap-magic> Pcap magic number/pcap format to store, see -D\n"
1168 " -D|--dump-pcap-types Dump pcap types and magic numbers and quit\n"
1169 " -B|--dump-bpf Dump generated BPF assembly\n"
1170 " -r|--rand Randomize packet forwarding order (dev->dev)\n"
1171 " -M|--no-promisc No promiscuous mode for netdev\n"
1172 " -A|--no-sock-mem Don't tune core socket memory\n"
1173 " -N|--no-hwtimestamp Disable hardware time stamping\n"
1174 " -m|--mmap Mmap(2) pcap file I/O, e.g. for replaying pcaps\n"
1175 " -G|--sg Scatter/gather pcap file I/O\n"
1176 " -c|--clrw Use slower read(2)/write(2) I/O\n"
1177 " -S|--ring-size <size> Specify ring size to: <num>KiB/MiB/GiB\n"
1178 " -k|--kernel-pull <uint> Kernel pull from user interval in us (def: 10us)\n"
1179 " -J|--jumbo-support Support replay/fwd 64KB Super Jumbo Frames (def: 2048B)\n"
1180 " -b|--bind-cpu <cpu> Bind to specific CPU\n"
1181 " -u|--user <userid> Drop privileges and change to userid\n"
1182 " -g|--group <groupid> Drop privileges and change to groupid\n"
1183 " -H|--prio-high Make this high priority process\n"
1184 " -Q|--notouch-irq Do not touch IRQ CPU affinity of NIC\n"
1185 " -s|--silent Do not print captured packets\n"
1186 " -q|--less Print less-verbose packet information\n"
1187 " -X|--hex Print packet data in hex format\n"
1188 " -l|--ascii Print human-readable packet data\n"
1189 " -U|--update Update GeoIP databases\n"
1190 " -V|--verbose Be more verbose\n"
1191 " -v|--version Show version and exit\n"
1192 " -h|--help Guess what?!\n\n"
1193 "Examples:\n"
1194 " netsniff-ng --in eth0 --out dump.pcap -s -T 0xa1b2c3d4 --b 0 tcp or udp\n"
1195 " netsniff-ng --in wlan0 --rfraw --out dump.pcap --silent --bind-cpu 0\n"
1196 " netsniff-ng --in dump.pcap --mmap --out eth0 -k1000 --silent --bind-cpu 0\n"
1197 " netsniff-ng --in dump.pcap --out dump.cfg --silent --bind-cpu 0\n"
1198 " netsniff-ng --in dump.pcap --out dump2.pcap --silent tcp\n"
1199 " netsniff-ng --in eth0 --out eth1 --silent --bind-cpu 0 -J --type host\n"
1200 " netsniff-ng --in eth1 --out /opt/probe/ -s -m --interval 100MiB -b 0\n"
1201 " netsniff-ng --in vlan0 --out dump.pcap -c -u `id -u bob` -g `id -g bob`\n"
1202 " netsniff-ng --in any --filter http.bpf --jumbo-support --ascii -V\n\n"
1203 "Note:\n"
1204 " For introducing bit errors, delays with random variation and more\n"
1205 " while replaying pcaps, make use of tc(8) with its disciplines (e.g. netem).\n");
1206 puts(copyright);
1207 die();
1208 }
1209
1210 static void __noreturn version(void)
1211 {
1212 printf("netsniff-ng %s, Git id: %s\n", VERSION_LONG, GITVERSION);
1213 puts("the packet sniffing beast\n"
1214 "http://www.netsniff-ng.org\n");
1215 puts(copyright);
1216 die();
1217 }
1218
1219 int main(int argc, char **argv)
1220 {
1221 char *ptr;
1222 int c, i, j, cpu_tmp, opt_index, ops_touched = 0, vals[4] = {0};
1223 bool prio_high = false, setsockmem = true;
1224 void (*main_loop)(struct ctx *ctx) = NULL;
1225 struct ctx ctx;
1226
1227 init_ctx(&ctx);
1228 srand(time(NULL));
1229
1230 while ((c = getopt_long(argc, argv, short_options, long_options,
1231 &opt_index)) != EOF) {
1232 switch (c) {
1233 case 'd':
1234 case 'i':
1235 ctx.device_in = xstrdup(optarg);
1236 break;
1237 case 'o':
1238 ctx.device_out = xstrdup(optarg);
1239 break;
1240 case 'P':
1241 ctx.prefix = xstrdup(optarg);
1242 break;
1243 case 'R':
1244 ctx.rfraw = 1;
1245 break;
1246 case 'r':
1247 ctx.randomize = true;
1248 break;
1249 case 'J':
1250 ctx.jumbo = true;
1251 break;
1252 case 'T':
1253 ctx.magic = (uint32_t) strtoul(optarg, NULL, 0);
1254 pcap_check_magic(ctx.magic);
1255 break;
1256 case 'f':
1257 ctx.filter = xstrdup(optarg);
1258 break;
1259 case 'M':
1260 ctx.promiscuous = false;
1261 break;
1262 case 'N':
1263 ctx.hwtimestamp = false;
1264 break;
1265 case 'A':
1266 setsockmem = false;
1267 break;
1268 case 'u':
1269 ctx.uid = strtoul(optarg, NULL, 0);
1270 ctx.enforce = true;
1271 break;
1272 case 'g':
1273 ctx.gid = strtoul(optarg, NULL, 0);
1274 ctx.enforce = true;
1275 break;
1276 case 'C':
1277 ctx.fanout_group = strtoul(optarg, NULL, 0);
1278 if (ctx.fanout_group == 0)
1279 panic("Non-zero fanout group id required!\n");
1280 break;
1281 case 'K':
1282 if (!strncmp(optarg, "hash", strlen("hash")))
1283 ctx.fanout_type = PACKET_FANOUT_HASH;
1284 else if (!strncmp(optarg, "lb", strlen("lb")) ||
1285 !strncmp(optarg, "rr", strlen("rr")))
1286 ctx.fanout_type = PACKET_FANOUT_LB;
1287 else if (!strncmp(optarg, "cpu", strlen("cpu")))
1288 ctx.fanout_type = PACKET_FANOUT_CPU;
1289 else if (!strncmp(optarg, "rnd", strlen("rnd")))
1290 ctx.fanout_type = PACKET_FANOUT_RND;
1291 else if (!strncmp(optarg, "roll", strlen("roll")))
1292 ctx.fanout_type = PACKET_FANOUT_ROLLOVER;
1293 else if (!strncmp(optarg, "qm", strlen("qm")))
1294 ctx.fanout_type = PACKET_FANOUT_QM;
1295 else
1296 panic("Unkown fanout type!\n");
1297 break;
1298 case 'L':
1299 if (!strncmp(optarg, "defrag", strlen("defrag")))
1300 ctx.fanout_type |= PACKET_FANOUT_FLAG_DEFRAG;
1301 else if (!strncmp(optarg, "roll", strlen("roll")))
1302 ctx.fanout_type |= PACKET_FANOUT_FLAG_ROLLOVER;
1303 else
1304 panic("Unkown fanout option!\n");
1305 break;
1306 case 't':
1307 if (!strncmp(optarg, "host", strlen("host")))
1308 ctx.packet_type = PACKET_HOST;
1309 else if (!strncmp(optarg, "broadcast", strlen("broadcast")))
1310 ctx.packet_type = PACKET_BROADCAST;
1311 else if (!strncmp(optarg, "multicast", strlen("multicast")))
1312 ctx.packet_type = PACKET_MULTICAST;
1313 else if (!strncmp(optarg, "others", strlen("others")))
1314 ctx.packet_type = PACKET_OTHERHOST;
1315 else if (!strncmp(optarg, "outgoing", strlen("outgoing")))
1316 ctx.packet_type = PACKET_OUTGOING;
1317 else
1318 ctx.packet_type = -1;
1319 break;
1320 case 'S':
1321 ptr = optarg;
1322 for (j = i = strlen(optarg); i > 0; --i) {
1323 if (!isdigit(optarg[j - i]))
1324 break;
1325 ptr++;
1326 }
1327
1328 if (!strncmp(ptr, "KiB", strlen("KiB")))
1329 ctx.reserve_size = 1 << 10;
1330 else if (!strncmp(ptr, "MiB", strlen("MiB")))
1331 ctx.reserve_size = 1 << 20;
1332 else if (!strncmp(ptr, "GiB", strlen("GiB")))
1333 ctx.reserve_size = 1 << 30;
1334 else
1335 panic("Syntax error in ring size param!\n");
1336
1337 ctx.reserve_size *= strtoul(optarg, NULL, 0);
1338 break;
1339 case 'b':
1340 cpu_tmp = strtol(optarg, NULL, 0);
1341
1342 cpu_affinity(cpu_tmp);
1343 if (ctx.cpu != -2)
1344 ctx.cpu = cpu_tmp;
1345 break;
1346 case 'H':
1347 prio_high = true;
1348 break;
1349 case 'c':
1350 ctx.pcap = PCAP_OPS_RW;
1351 ops_touched = 1;
1352 break;
1353 case 'm':
1354 ctx.pcap = PCAP_OPS_MM;
1355 ops_touched = 1;
1356 break;
1357 case 'G':
1358 ctx.pcap = PCAP_OPS_SG;
1359 ops_touched = 1;
1360 break;
1361 case 'Q':
1362 ctx.cpu = -2;
1363 break;
1364 case 's':
1365 ctx.print_mode = PRINT_NONE;
1366 break;
1367 case 'q':
1368 ctx.print_mode = PRINT_LESS;
1369 break;
1370 case 'X':
1371 ctx.print_mode =
1372 (ctx.print_mode == PRINT_ASCII) ?
1373 PRINT_HEX_ASCII : PRINT_HEX;
1374 break;
1375 case 'l':
1376 ctx.print_mode =
1377 (ctx.print_mode == PRINT_HEX) ?
1378 PRINT_HEX_ASCII : PRINT_ASCII;
1379 break;
1380 case 'k':
1381 ctx.kpull = strtoul(optarg, NULL, 0);
1382 break;
1383 case 'n':
1384 frame_count_max = strtoul(optarg, NULL, 0);
1385 break;
1386 case 'F':
1387 ptr = optarg;
1388 for (j = i = strlen(optarg); i > 0; --i) {
1389 if (!isdigit(optarg[j - i]))
1390 break;
1391 ptr++;
1392 }
1393
1394 if (!strncmp(ptr, "KiB", strlen("KiB"))) {
1395 ctx.dump_interval = 1 << 10;
1396 ctx.dump_mode = DUMP_INTERVAL_SIZE;
1397 } else if (!strncmp(ptr, "MiB", strlen("MiB"))) {
1398 ctx.dump_interval = 1 << 20;
1399 ctx.dump_mode = DUMP_INTERVAL_SIZE;
1400 } else if (!strncmp(ptr, "GiB", strlen("GiB"))) {
1401 ctx.dump_interval = 1 << 30;
1402 ctx.dump_mode = DUMP_INTERVAL_SIZE;
1403 } else if (!strncmp(ptr, "sec", strlen("sec"))) {
1404 ctx.dump_interval = 1;
1405 ctx.dump_mode = DUMP_INTERVAL_TIME;
1406 } else if (!strncmp(ptr, "min", strlen("min"))) {
1407 ctx.dump_interval = 60;
1408 ctx.dump_mode = DUMP_INTERVAL_TIME;
1409 } else if (!strncmp(ptr, "hrs", strlen("hrs"))) {
1410 ctx.dump_interval = 60 * 60;
1411 ctx.dump_mode = DUMP_INTERVAL_TIME;
1412 } else if (!strncmp(ptr, "s", strlen("s"))) {
1413 ctx.dump_interval = 1;
1414 ctx.dump_mode = DUMP_INTERVAL_TIME;
1415 } else {
1416 panic("Syntax error in time/size param!\n");
1417 }
1418
1419 ctx.dump_interval *= strtoul(optarg, NULL, 0);
1420 break;
1421 case 'V':
1422 ctx.verbose = true;
1423 break;
1424 case 'B':
1425 ctx.dump_bpf = true;
1426 break;
1427 case 'D':
1428 pcap_dump_type_features();
1429 die();
1430 break;
1431 case 'U':
1432 update_geoip();
1433 die();
1434 break;
1435 case 'v':
1436 version();
1437 break;
1438 case 'h':
1439 help();
1440 break;
1441 case '?':
1442 switch (optopt) {
1443 case 'd':
1444 case 'i':
1445 case 'o':
1446 case 'f':
1447 case 't':
1448 case 'P':
1449 case 'F':
1450 case 'n':
1451 case 'S':
1452 case 'b':
1453 case 'k':
1454 case 'T':
1455 case 'u':
1456 case 'g':
1457 case 'e':
1458 panic("Option -%c requires an argument!\n",
1459 optopt);
1460 default:
1461 if (isprint(optopt))
1462 printf("Unknown option character `0x%X\'!\n", optopt);
1463 die();
1464 }
1465 default:
1466 break;
1467 }
1468 }
1469
1470 if (!ctx.filter && optind != argc) {
1471 int ret;
1472 off_t offset = 0;
1473
1474 for (i = optind; i < argc; ++i) {
1475 size_t alen = strlen(argv[i]) + 2;
1476 size_t flen = ctx.filter ? strlen(ctx.filter) : 0;
1477
1478 ctx.filter = xrealloc(ctx.filter, flen + alen);
1479 ret = slprintf(ctx.filter + offset, strlen(argv[i]) + 2, "%s ", argv[i]);
1480 if (ret < 0)
1481 panic("Cannot concatenate filter string!\n");
1482 else
1483 offset += ret;
1484 }
1485 }
1486
1487 if (!ctx.device_in)
1488 ctx.device_in = xstrdup("any");
1489
1490 register_signal(SIGINT, signal_handler);
1491 register_signal(SIGQUIT, signal_handler);
1492 register_signal(SIGTERM, signal_handler);
1493 register_signal(SIGHUP, signal_handler);
1494
1495 tprintf_init();
1496
1497 if (prio_high) {
1498 set_proc_prio(-20);
1499 set_sched_status(SCHED_FIFO, sched_get_priority_max(SCHED_FIFO));
1500 }
1501
1502 if (device_mtu(ctx.device_in) || !strncmp("any", ctx.device_in, strlen(ctx.device_in))) {
1503 if (ctx.rfraw)
1504 setup_rfmon_mac80211_dev(&ctx, &ctx.device_in);
1505
1506 ctx.link_type = pcap_devtype_to_linktype(ctx.device_in);
1507
1508 if (!ctx.device_out) {
1509 ctx.dump = 0;
1510 main_loop = recv_only_or_dump;
1511 } else if (device_mtu(ctx.device_out)) {
1512 register_signal_f(SIGALRM, timer_elapsed, SA_SIGINFO);
1513 main_loop = receive_to_xmit;
1514 } else {
1515 ctx.dump = 1;
1516 register_signal_f(SIGALRM, timer_next_dump, SA_SIGINFO);
1517 main_loop = recv_only_or_dump;
1518 if (!ops_touched)
1519 ctx.pcap = PCAP_OPS_SG;
1520 }
1521 } else {
1522 if (ctx.device_out && device_mtu(ctx.device_out)) {
1523 register_signal_f(SIGALRM, timer_elapsed, SA_SIGINFO);
1524 main_loop = pcap_to_xmit;
1525 if (!ops_touched)
1526 ctx.pcap = PCAP_OPS_MM;
1527 } else {
1528 main_loop = read_pcap;
1529 if (!ops_touched)
1530 ctx.pcap = PCAP_OPS_SG;
1531 }
1532 }
1533
1534 bug_on(!main_loop);
1535
1536 init_geoip(0);
1537 if (setsockmem)
1538 set_system_socket_memory(vals, array_size(vals));
1539 if (!ctx.enforce)
1540 xlockme();
1541
1542 if (ctx.verbose)
1543 printf("pcap file I/O method: %s\n", pcap_ops_group_to_str[ctx.pcap]);
1544
1545 main_loop(&ctx);
1546
1547 if (!ctx.enforce)
1548 xunlockme();
1549 if (setsockmem)
1550 reset_system_socket_memory(vals, array_size(vals));
1551 destroy_geoip();
1552
1553 device_restore_irq_affinity_list();
1554 tprintf_cleanup();
1555
1556 destroy_ctx(&ctx);
1557 return 0;
1558 }
netsniff-ng toolkit, the packet sniffing beast, staging tree