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flowtop: Simplify flows refresh delay
[netsniff-ng-new.git] / netsniff-ng.c
blob8d221512791d24c48a77311823c94af8e46db8a7
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 #include <inttypes.h>
26
27 #include "ring_rx.h"
28 #include "ring_tx.h"
29 #include "mac80211.h"
30 #include "dev.h"
31 #include "built_in.h"
32 #include "pcap_io.h"
33 #include "privs.h"
34 #include "proc.h"
35 #include "bpf.h"
36 #include "ioops.h"
37 #include "die.h"
38 #include "irq.h"
39 #include "str.h"
40 #include "sig.h"
41 #include "config.h"
42 #include "sock.h"
43 #include "geoip.h"
44 #include "lockme.h"
45 #include "tprintf.h"
46 #include "timer.h"
47 #include "tstamping.h"
48 #include "dissector.h"
49 #include "xmalloc.h"
50
51 enum dump_mode {
52 DUMP_INTERVAL_TIME,
53 DUMP_INTERVAL_SIZE,
54 };
55
56 struct ctx {
57 char *device_in, *device_out, *device_trans, *filter, *prefix;
58 int cpu, rfraw, dump, print_mode, dump_dir, packet_type;
59 unsigned long kpull, dump_interval, tx_bytes, tx_packets;
60 size_t reserve_size;
61 bool randomize, promiscuous, enforce, jumbo, dump_bpf, hwtimestamp, verbose;
62 enum pcap_ops_groups pcap;
63 enum dump_mode dump_mode;
64 uid_t uid;
65 gid_t gid;
66 uint32_t link_type, magic;
67 uint32_t fanout_group, fanout_type;
68 uint64_t pkts_seen, pkts_recvd, pkts_drops;
69 uint64_t pkts_recvd_last, pkts_drops_last;
70 };
71
72 static volatile sig_atomic_t sigint = 0, sighup = 0;
73 static volatile bool next_dump = false;
74 static volatile sig_atomic_t sighup_time = 0;
75
76 static const char *short_options =
77 "d:i:o:rf:MNJt:S:k:n:b:HQmcsqXlvhF:RGAP:Vu:g:T:DBUC:K:L:w";
78 static const struct option long_options[] = {
79 {"dev", required_argument, NULL, 'd'},
80 {"in", required_argument, NULL, 'i'},
81 {"out", required_argument, NULL, 'o'},
82 {"filter", required_argument, NULL, 'f'},
83 {"num", required_argument, NULL, 'n'},
84 {"type", required_argument, NULL, 't'},
85 {"interval", required_argument, NULL, 'F'},
86 {"ring-size", required_argument, NULL, 'S'},
87 {"kernel-pull", required_argument, NULL, 'k'},
88 {"bind-cpu", required_argument, NULL, 'b'},
89 {"prefix", required_argument, NULL, 'P'},
90 {"user", required_argument, NULL, 'u'},
91 {"group", required_argument, NULL, 'g'},
92 {"magic", required_argument, NULL, 'T'},
93 {"fanout-group", required_argument, NULL, 'C'},
94 {"fanout-type", required_argument, NULL, 'K'},
95 {"fanout-opts", required_argument, NULL, 'L'},
96 {"rand", no_argument, NULL, 'r'},
97 {"rfraw", no_argument, NULL, 'R'},
98 {"mmap", no_argument, NULL, 'm'},
99 {"sg", no_argument, NULL, 'G'},
100 {"clrw", no_argument, NULL, 'c'},
101 {"jumbo-support", no_argument, NULL, 'J'},
102 {"no-promisc", no_argument, NULL, 'M'},
103 {"no-hwtimestamp", no_argument, NULL, 'N'},
104 {"prio-high", no_argument, NULL, 'H'},
105 {"notouch-irq", no_argument, NULL, 'Q'},
106 {"dump-pcap-types", no_argument, NULL, 'D'},
107 {"dump-bpf", no_argument, NULL, 'B'},
108 {"silent", no_argument, NULL, 's'},
109 {"less", no_argument, NULL, 'q'},
110 {"hex", no_argument, NULL, 'X'},
111 {"ascii", no_argument, NULL, 'l'},
112 {"no-sock-mem", no_argument, NULL, 'A'},
113 {"update", no_argument, NULL, 'U'},
114 {"cooked", no_argument, NULL, 'w'},
115 {"verbose", no_argument, NULL, 'V'},
116 {"version", no_argument, NULL, 'v'},
117 {"help", no_argument, NULL, 'h'},
118 {NULL, 0, NULL, 0}
119 };
120
121 static const char *copyright = "Please report bugs to <netsniff-ng@googlegroups.com>\n"
122 "Copyright (C) 2009-2013 Daniel Borkmann <dborkma@tik.ee.ethz.ch>\n"
123 "Copyright (C) 2009-2012 Emmanuel Roullit <emmanuel.roullit@gmail.com>\n"
124 "Copyright (C) 2012 Markus Amend <markus@netsniff-ng.org>\n"
125 "Swiss federal institute of technology (ETH Zurich)\n"
126 "License: GNU GPL version 2.0\n"
127 "This is free software: you are free to change and redistribute it.\n"
128 "There is NO WARRANTY, to the extent permitted by law.";
129
130 static int tx_sock;
131 static struct itimerval itimer;
132 static unsigned long frame_count_max = 0, interval = TX_KERNEL_PULL_INT;
133 static time_t start_time;
134
135 #define __pcap_io pcap_ops[ctx->pcap]
136
137 static void signal_handler(int number)
138 {
139 switch (number) {
140 case SIGINT:
141 case SIGQUIT:
142 case SIGTERM:
143 sigint = 1;
144 break;
145 case SIGHUP:
146 sighup = 1;
147 sighup_time = (sig_atomic_t)(time(NULL) - start_time);
148 break;
149 default:
150 break;
151 }
152 }
153
154 static void timer_elapsed(int unused __maybe_unused)
155 {
156 int ret;
157
158 set_itimer_interval_value(&itimer, 0, interval);
159
160 ret = pull_and_flush_tx_ring(tx_sock);
161 if (unlikely(ret < 0)) {
162 /* We could hit EBADF if the socket has been closed before
163 * the timer was triggered.
164 */
165 if (errno != EBADF && errno != ENOBUFS)
166 panic("Flushing TX_RING failed: %s!\n", strerror(errno));
167 }
168
169 setitimer(ITIMER_REAL, &itimer, NULL);
170 }
171
172 static void timer_purge(void)
173 {
174 int ret;
175
176 ret = pull_and_flush_tx_ring_wait(tx_sock);
177 if (unlikely(ret < 0)) {
178 if (errno != EBADF && errno != ENOBUFS)
179 panic("Flushing TX_RING failed: %s!\n", strerror(errno));
180 }
181
182 set_itimer_interval_value(&itimer, 0, 0);
183 setitimer(ITIMER_REAL, &itimer, NULL);
184 }
185
186 static void timer_next_dump(int unused __maybe_unused)
187 {
188 set_itimer_interval_value(&itimer, interval, 0);
189 next_dump = true;
190 setitimer(ITIMER_REAL, &itimer, NULL);
191 }
192
193 static inline bool dump_to_pcap(struct ctx *ctx)
194 {
195 return ctx->dump;
196 }
197
198 static void on_panic_del_rfmon(void *arg)
199 {
200 leave_rfmon_mac80211(arg);
201 }
202
203 static inline void setup_rfmon_mac80211_dev(struct ctx *ctx, char **rfmon_dev)
204 {
205 ctx->device_trans = xstrdup(*rfmon_dev);
206 xfree(*rfmon_dev);
207
208 enter_rfmon_mac80211(ctx->device_trans, rfmon_dev);
209 panic_handler_add(on_panic_del_rfmon, *rfmon_dev);
210 }
211
212 static int update_rx_stats(struct ctx *ctx, int sock, bool is_v3)
213 {
214 uint64_t packets, drops;
215 int ret;
216
217 ret = get_rx_net_stats(sock, &packets, &drops, is_v3);
218 if (ret)
219 return ret;
220
221 ctx->pkts_recvd += packets;
222 ctx->pkts_drops += drops;
223 ctx->pkts_recvd_last = packets;
224 ctx->pkts_drops_last = drops;
225
226 return 0;
227 }
228
229 static void dump_rx_stats(struct ctx *ctx, int sock, bool is_v3)
230 {
231 if (update_rx_stats(ctx, sock, is_v3))
232 return;
233
234 printf("\r%12"PRIu64" packets incoming (%"PRIu64" unread on exit)\n",
235 is_v3 ? ctx->pkts_seen : ctx->pkts_recvd,
236 is_v3 ? ctx->pkts_recvd - ctx->pkts_seen : 0);
237 printf("\r%12"PRIu64" packets passed filter\n",
238 ctx->pkts_recvd - ctx->pkts_drops);
239 printf("\r%12"PRIu64" packets failed filter (out of space)\n",
240 ctx->pkts_drops);
241
242 if (ctx->pkts_recvd > 0)
243 printf("\r%12.4lf%% packet droprate\n",
244 (1.0 * ctx->pkts_drops / ctx->pkts_recvd) * 100.0);
245 }
246
247 static void pcap_to_xmit(struct ctx *ctx)
248 {
249 uint8_t *out = NULL;
250 int ifindex, fd = 0, ret;
251 size_t size;
252 unsigned int it = 0;
253 unsigned long trunced = 0;
254 struct ring tx_ring;
255 struct frame_map *hdr;
256 struct sock_fprog bpf_ops;
257 struct timeval start, end, diff;
258 pcap_pkthdr_t phdr;
259
260 if (!device_up_and_running(ctx->device_out) && !ctx->rfraw)
261 panic("Device not up and running!\n");
262
263 bug_on(!__pcap_io);
264
265 tx_sock = pf_socket();
266
267 if (!strncmp("-", ctx->device_in, strlen("-"))) {
268 fd = dup_or_die(fileno(stdin));
269 close(fileno(stdin));
270 if (ctx->pcap == PCAP_OPS_MM)
271 ctx->pcap = PCAP_OPS_SG;
272 } else {
273 fd = open_or_die(ctx->device_in, O_RDONLY | O_LARGEFILE | O_NOATIME);
274 }
275
276 if (__pcap_io->init_once_pcap)
277 __pcap_io->init_once_pcap(true);
278
279 ret = __pcap_io->pull_fhdr_pcap(fd, &ctx->magic, &ctx->link_type);
280 if (ret)
281 panic("Error reading pcap header!\n");
282
283 if (__pcap_io->prepare_access_pcap) {
284 ret = __pcap_io->prepare_access_pcap(fd, PCAP_MODE_RD, ctx->jumbo);
285 if (ret)
286 panic("Error prepare reading pcap!\n");
287 }
288
289 if (ctx->rfraw) {
290 setup_rfmon_mac80211_dev(ctx, &ctx->device_out);
291
292 if (ctx->link_type != LINKTYPE_IEEE802_11 &&
293 ctx->link_type != LINKTYPE_IEEE802_11_RADIOTAP)
294 panic("Wrong linktype of pcap!\n");
295 }
296
297 ifindex = device_ifindex(ctx->device_out);
298 size = ring_size(ctx->device_out, ctx->reserve_size);
299
300 bpf_parse_rules(ctx->filter, &bpf_ops, ctx->link_type);
301 if (ctx->dump_bpf)
302 bpf_dump_all(&bpf_ops);
303
304 ring_tx_setup(&tx_ring, tx_sock, size, ifindex, ctx->jumbo, ctx->verbose);
305
306 dissector_init_all(ctx->print_mode);
307
308 if (ctx->cpu >= 0 && ifindex > 0) {
309 int irq = device_irq_number(ctx->device_out);
310 device_set_irq_affinity(irq, ctx->cpu);
311
312 if (ctx->verbose)
313 printf("IRQ: %s:%d > CPU%d\n",
314 ctx->device_out, irq, ctx->cpu);
315 }
316
317 if (ctx->kpull)
318 interval = ctx->kpull;
319
320 set_itimer_interval_value(&itimer, 0, interval);
321 setitimer(ITIMER_REAL, &itimer, NULL);
322
323 drop_privileges(ctx->enforce, ctx->uid, ctx->gid);
324
325 printf("Running! Hang up with ^C!\n\n");
326 fflush(stdout);
327
328 bug_on(gettimeofday(&start, NULL));
329
330 while (likely(sigint == 0)) {
331 while (user_may_pull_from_tx(tx_ring.frames[it].iov_base)) {
332 hdr = tx_ring.frames[it].iov_base;
333 out = ((uint8_t *) hdr) + TPACKET2_HDRLEN - sizeof(struct sockaddr_ll);
334
335 do {
336 ret = __pcap_io->read_pcap(fd, &phdr, ctx->magic, out,
337 ring_frame_size(&tx_ring));
338 if (unlikely(ret <= 0))
339 goto out;
340
341 if (ring_frame_size(&tx_ring) <
342 pcap_get_length(&phdr, ctx->magic)) {
343 pcap_set_length(&phdr, ctx->magic,
344 ring_frame_size(&tx_ring));
345 trunced++;
346 }
347 } while (ctx->filter &&
348 !bpf_run_filter(&bpf_ops, out,
349 pcap_get_length(&phdr, ctx->magic)));
350
351 pcap_pkthdr_to_tpacket_hdr(&phdr, ctx->magic, &hdr->tp_h, NULL);
352
353 ctx->tx_bytes += hdr->tp_h.tp_len;;
354 ctx->tx_packets++;
355
356 show_frame_hdr(out, hdr->tp_h.tp_snaplen,
357 ctx->link_type, hdr, ctx->print_mode,
358 ctx->tx_packets);
359
360 dissector_entry_point(out, hdr->tp_h.tp_snaplen,
361 ctx->link_type, ctx->print_mode,
362 &hdr->s_ll);
363
364 kernel_may_pull_from_tx(&hdr->tp_h);
365
366 it++;
367 if (it >= tx_ring.layout.tp_frame_nr)
368 it = 0;
369
370 if (unlikely(sigint == 1))
371 break;
372
373 if (frame_count_max != 0) {
374 if (ctx->tx_packets >= frame_count_max) {
375 sigint = 1;
376 break;
377 }
378 }
379 }
380 }
381
382 out:
383 bug_on(gettimeofday(&end, NULL));
384 timersub(&end, &start, &diff);
385
386 timer_purge();
387
388 bpf_release(&bpf_ops);
389
390 dissector_cleanup_all();
391 destroy_tx_ring(tx_sock, &tx_ring);
392
393 if (ctx->rfraw)
394 leave_rfmon_mac80211(ctx->device_out);
395
396 if (__pcap_io->prepare_close_pcap)
397 __pcap_io->prepare_close_pcap(fd, PCAP_MODE_RD);
398
399 if (!strncmp("-", ctx->device_in, strlen("-")))
400 dup2(fd, fileno(stdin));
401 close(fd);
402
403 close(tx_sock);
404
405 fflush(stdout);
406 printf("\n");
407 printf("\r%12lu packets outgoing\n", ctx->tx_packets);
408 printf("\r%12lu packets truncated in file\n", trunced);
409 printf("\r%12lu bytes outgoing\n", ctx->tx_bytes);
410 printf("\r%12lu sec, %lu usec in total\n", diff.tv_sec, diff.tv_usec);
411 }
412
413 static void receive_to_xmit(struct ctx *ctx)
414 {
415 short ifflags = 0;
416 uint8_t *in, *out;
417 int rx_sock, ifindex_in, ifindex_out, ret;
418 size_t size_in, size_out;
419 unsigned int it_in = 0, it_out = 0;
420 struct frame_map *hdr_in, *hdr_out;
421 struct ring tx_ring, rx_ring;
422 struct pollfd rx_poll;
423 struct sock_fprog bpf_ops;
424
425 if (!strncmp(ctx->device_in, ctx->device_out, IFNAMSIZ))
426 panic("Ingress/egress devices must be different!\n");
427 if (!device_up_and_running(ctx->device_out))
428 panic("Egress device not up and running!\n");
429
430 rx_sock = pf_socket();
431 tx_sock = pf_socket();
432
433 ifindex_in = device_ifindex(ctx->device_in);
434 ifindex_out = device_ifindex(ctx->device_out);
435
436 size_in = ring_size(ctx->device_in, ctx->reserve_size);
437 size_out = ring_size(ctx->device_out, ctx->reserve_size);
438
439 enable_kernel_bpf_jit_compiler();
440
441 bpf_parse_rules(ctx->filter, &bpf_ops, ctx->link_type);
442 if (ctx->dump_bpf)
443 bpf_dump_all(&bpf_ops);
444 bpf_attach_to_sock(rx_sock, &bpf_ops);
445
446 ring_rx_setup(&rx_ring, rx_sock, size_in, ifindex_in, &rx_poll, false, ctx->jumbo,
447 ctx->verbose, ctx->fanout_group, ctx->fanout_type);
448 ring_tx_setup(&tx_ring, tx_sock, size_out, ifindex_out, ctx->jumbo, ctx->verbose);
449
450 dissector_init_all(ctx->print_mode);
451
452 if (ctx->promiscuous)
453 ifflags = device_enter_promiscuous_mode(ctx->device_in);
454
455 if (ctx->kpull)
456 interval = ctx->kpull;
457
458 set_itimer_interval_value(&itimer, 0, interval);
459 setitimer(ITIMER_REAL, &itimer, NULL);
460
461 drop_privileges(ctx->enforce, ctx->uid, ctx->gid);
462
463 printf("Running! Hang up with ^C!\n\n");
464 fflush(stdout);
465
466 while (likely(sigint == 0)) {
467 while (user_may_pull_from_rx(rx_ring.frames[it_in].iov_base)) {
468 hdr_in = rx_ring.frames[it_in].iov_base;
469 in = ((uint8_t *) hdr_in) + hdr_in->tp_h.tp_mac;
470
471 ctx->pkts_seen++;
472
473 if (ctx->packet_type != -1)
474 if (ctx->packet_type != hdr_in->s_ll.sll_pkttype)
475 goto next;
476
477 hdr_out = tx_ring.frames[it_out].iov_base;
478 out = ((uint8_t *) hdr_out) + TPACKET2_HDRLEN - sizeof(struct sockaddr_ll);
479
480 while (!user_may_pull_from_tx(tx_ring.frames[it_out].iov_base) &&
481 likely(!sigint)) {
482 if (ctx->randomize)
483 next_rnd_slot(&it_out, &tx_ring);
484 else {
485 it_out++;
486 if (it_out >= tx_ring.layout.tp_frame_nr)
487 it_out = 0;
488 }
489
490 hdr_out = tx_ring.frames[it_out].iov_base;
491 out = ((uint8_t *) hdr_out) + TPACKET2_HDRLEN - sizeof(struct sockaddr_ll);
492 }
493
494 tpacket_hdr_clone(&hdr_out->tp_h, &hdr_in->tp_h);
495 fmemcpy(out, in, hdr_in->tp_h.tp_len);
496
497 kernel_may_pull_from_tx(&hdr_out->tp_h);
498 if (ctx->randomize)
499 next_rnd_slot(&it_out, &tx_ring);
500 else {
501 it_out++;
502 if (it_out >= tx_ring.layout.tp_frame_nr)
503 it_out = 0;
504 }
505
506 show_frame_hdr(in, hdr_in->tp_h.tp_snaplen,
507 ctx->link_type, hdr_in, ctx->print_mode,
508 ctx->pkts_seen);
509
510 dissector_entry_point(in, hdr_in->tp_h.tp_snaplen,
511 ctx->link_type, ctx->print_mode,
512 &hdr_in->s_ll);
513
514 if (frame_count_max != 0) {
515 if (ctx->pkts_seen >= frame_count_max) {
516 sigint = 1;
517 break;
518 }
519 }
520
521 next:
522 kernel_may_pull_from_rx(&hdr_in->tp_h);
523
524 it_in++;
525 if (it_in >= rx_ring.layout.tp_frame_nr)
526 it_in = 0;
527
528 if (unlikely(sigint == 1))
529 goto out;
530 }
531
532 ret = poll(&rx_poll, 1, -1);
533 if (unlikely(ret < 0)) {
534 if (errno != EINTR)
535 panic("Poll failed!\n");
536 }
537 }
538
539 out:
540 timer_purge();
541
542 dump_rx_stats(ctx, rx_sock, false);
543
544 bpf_release(&bpf_ops);
545
546 dissector_cleanup_all();
547
548 destroy_tx_ring(tx_sock, &tx_ring);
549 destroy_rx_ring(rx_sock, &rx_ring);
550
551 if (ctx->promiscuous)
552 device_leave_promiscuous_mode(ctx->device_in, ifflags);
553
554 close(tx_sock);
555 close(rx_sock);
556 }
557
558 static void translate_pcap_to_txf(int fdo, uint8_t *out, size_t len)
559 {
560 size_t bytes_done = 0;
561 char bout[80];
562
563 slprintf(bout, sizeof(bout), "{\n ");
564 write_or_die(fdo, bout, strlen(bout));
565
566 while (bytes_done < len) {
567 slprintf(bout, sizeof(bout), "0x%02x,", out[bytes_done]);
568 write_or_die(fdo, bout, strlen(bout));
569
570 bytes_done++;
571
572 if (bytes_done % 10 == 0) {
573 slprintf(bout, sizeof(bout), "\n");
574 write_or_die(fdo, bout, strlen(bout));
575
576 if (bytes_done < len) {
577 slprintf(bout, sizeof(bout), " ");
578 write_or_die(fdo, bout, strlen(bout));
579 }
580 } else if (bytes_done < len) {
581 slprintf(bout, sizeof(bout), " ");
582 write_or_die(fdo, bout, strlen(bout));
583 }
584 }
585 if (bytes_done % 10 != 0) {
586 slprintf(bout, sizeof(bout), "\n");
587 write_or_die(fdo, bout, strlen(bout));
588 }
589
590 slprintf(bout, sizeof(bout), "}\n\n");
591 write_or_die(fdo, bout, strlen(bout));
592 }
593
594 static void read_pcap(struct ctx *ctx)
595 {
596 uint8_t *out;
597 int ret, fd, fdo = 0;
598 unsigned long trunced = 0;
599 size_t out_len;
600 pcap_pkthdr_t phdr;
601 struct sock_fprog bpf_ops;
602 struct frame_map fm;
603 struct timeval start, end, diff;
604 bool is_out_pcap = ctx->device_out && strstr(ctx->device_out, ".pcap");
605 const struct pcap_file_ops *pcap_out_ops = pcap_ops[PCAP_OPS_RW];
606
607 bug_on(!__pcap_io);
608
609 if (!strncmp("-", ctx->device_in, strlen("-"))) {
610 fd = dup_or_die(fileno(stdin));
611 close(fileno(stdin));
612 if (ctx->pcap == PCAP_OPS_MM)
613 ctx->pcap = PCAP_OPS_SG;
614 } else {
615 /* O_NOATIME requires privileges, in case we don't have
616 * them, retry without them at a minor cost of updating
617 * atime in case the fs has been mounted as such.
618 */
619 fd = open(ctx->device_in, O_RDONLY | O_LARGEFILE | O_NOATIME);
620 if (fd < 0 && errno == EPERM)
621 fd = open_or_die(ctx->device_in, O_RDONLY | O_LARGEFILE);
622 if (fd < 0)
623 panic("Cannot open file %s! %s.\n", ctx->device_in,
624 strerror(errno));
625 }
626
627 if (__pcap_io->init_once_pcap)
628 __pcap_io->init_once_pcap(false);
629
630 ret = __pcap_io->pull_fhdr_pcap(fd, &ctx->magic, &ctx->link_type);
631 if (ret)
632 panic("Error reading pcap header!\n");
633
634 if (__pcap_io->prepare_access_pcap) {
635 ret = __pcap_io->prepare_access_pcap(fd, PCAP_MODE_RD, ctx->jumbo);
636 if (ret)
637 panic("Error prepare reading pcap!\n");
638 }
639
640 fmemset(&fm, 0, sizeof(fm));
641
642 bpf_parse_rules(ctx->filter, &bpf_ops, ctx->link_type);
643 if (ctx->dump_bpf)
644 bpf_dump_all(&bpf_ops);
645
646 dissector_init_all(ctx->print_mode);
647
648 out_len = round_up(1024 * 1024, RUNTIME_PAGE_SIZE);
649 out = xmalloc_aligned(out_len, CO_CACHE_LINE_SIZE);
650
651 if (ctx->device_out) {
652 if (!strncmp("-", ctx->device_out, strlen("-"))) {
653 fdo = dup_or_die(fileno(stdout));
654 close(fileno(stdout));
655 } else {
656 fdo = open_or_die_m(ctx->device_out, O_RDWR | O_CREAT |
657 O_TRUNC | O_LARGEFILE, DEFFILEMODE);
658 }
659 }
660
661 if (is_out_pcap) {
662 ret = pcap_out_ops->push_fhdr_pcap(fdo, ctx->magic,
663 ctx->link_type);
664 if (ret)
665 panic("Error writing pcap header!\n");
666 }
667
668 drop_privileges(ctx->enforce, ctx->uid, ctx->gid);
669
670 printf("Running! Hang up with ^C!\n\n");
671 fflush(stdout);
672
673 bug_on(gettimeofday(&start, NULL));
674
675 while (likely(sigint == 0)) {
676 do {
677 ret = __pcap_io->read_pcap(fd, &phdr, ctx->magic,
678 out, out_len);
679 if (unlikely(ret < 0))
680 goto out;
681
682 if (unlikely(pcap_get_length(&phdr, ctx->magic) == 0)) {
683 trunced++;
684 continue;
685 }
686
687 if (unlikely(pcap_get_length(&phdr, ctx->magic) > out_len)) {
688 pcap_set_length(&phdr, ctx->magic, out_len);
689 trunced++;
690 }
691 } while (ctx->filter &&
692 !bpf_run_filter(&bpf_ops, out,
693 pcap_get_length(&phdr, ctx->magic)));
694
695 pcap_pkthdr_to_tpacket_hdr(&phdr, ctx->magic, &fm.tp_h, &fm.s_ll);
696
697 ctx->tx_bytes += fm.tp_h.tp_len;
698 ctx->tx_packets++;
699
700 show_frame_hdr(out, fm.tp_h.tp_snaplen, ctx->link_type, &fm,
701 ctx->print_mode, ctx->tx_packets);
702
703 dissector_entry_point(out, fm.tp_h.tp_snaplen,
704 ctx->link_type, ctx->print_mode,
705 &fm.s_ll);
706
707 if (is_out_pcap) {
708 size_t pcap_len = pcap_get_length(&phdr, ctx->magic);
709 int wlen = pcap_out_ops->write_pcap(fdo, &phdr,
710 ctx->magic, out,
711 pcap_len);
712 if (unlikely(wlen != (int)pcap_get_total_length(&phdr, ctx->magic)))
713 panic("Error writing to pcap!\n");
714 } else if (ctx->device_out) {
715 translate_pcap_to_txf(fdo, out, fm.tp_h.tp_snaplen);
716 }
717
718 if (frame_count_max != 0) {
719 if (ctx->tx_packets >= frame_count_max) {
720 sigint = 1;
721 break;
722 }
723 }
724 }
725
726 out:
727 bug_on(gettimeofday(&end, NULL));
728 timersub(&end, &start, &diff);
729
730 bpf_release(&bpf_ops);
731
732 dissector_cleanup_all();
733
734 if (__pcap_io->prepare_close_pcap)
735 __pcap_io->prepare_close_pcap(fd, PCAP_MODE_RD);
736
737 xfree(out);
738
739 fflush(stdout);
740 printf("\n");
741 printf("\r%12lu packets outgoing\n", ctx->tx_packets);
742 printf("\r%12lu packets truncated in file\n", trunced);
743 printf("\r%12lu bytes outgoing\n", ctx->tx_bytes);
744 printf("\r%12lu sec, %lu usec in total\n", diff.tv_sec, diff.tv_usec);
745
746 if (!strncmp("-", ctx->device_in, strlen("-")))
747 dup2(fd, fileno(stdin));
748 close(fd);
749
750 if (ctx->device_out) {
751 if (!strncmp("-", ctx->device_out, strlen("-")))
752 dup2(fdo, fileno(stdout));
753 close(fdo);
754 }
755 }
756
757 static void finish_multi_pcap_file(struct ctx *ctx, int fd)
758 {
759 __pcap_io->fsync_pcap(fd);
760
761 if (__pcap_io->prepare_close_pcap)
762 __pcap_io->prepare_close_pcap(fd, PCAP_MODE_WR);
763
764 close(fd);
765
766 fmemset(&itimer, 0, sizeof(itimer));
767 setitimer(ITIMER_REAL, &itimer, NULL);
768 }
769
770 static int next_multi_pcap_file(struct ctx *ctx, int fd)
771 {
772 int ret;
773 char fname[512];
774 time_t ftime;
775
776 __pcap_io->fsync_pcap(fd);
777
778 if (__pcap_io->prepare_close_pcap)
779 __pcap_io->prepare_close_pcap(fd, PCAP_MODE_WR);
780
781 close(fd);
782
783 if (sighup_time > 0) {
784 ftime = (time_t)(start_time + sighup_time);
785 sighup_time = 0;
786 } else
787 ftime = time(NULL);
788
789 slprintf(fname, sizeof(fname), "%s/%s%lu.pcap", ctx->device_out,
790 ctx->prefix ? : "dump-", ftime);
791
792 fd = open_or_die_m(fname, O_RDWR | O_CREAT | O_TRUNC |
793 O_LARGEFILE, DEFFILEMODE);
794
795 ret = __pcap_io->push_fhdr_pcap(fd, ctx->magic, ctx->link_type);
796 if (ret)
797 panic("Error writing pcap header!\n");
798
799 if (__pcap_io->prepare_access_pcap) {
800 ret = __pcap_io->prepare_access_pcap(fd, PCAP_MODE_WR, true);
801 if (ret)
802 panic("Error prepare writing pcap!\n");
803 }
804
805 return fd;
806 }
807
808 static void reset_interval(struct ctx *ctx)
809 {
810 if (ctx->dump_mode == DUMP_INTERVAL_TIME) {
811 interval = ctx->dump_interval;
812
813 set_itimer_interval_value(&itimer, interval, 0);
814 setitimer(ITIMER_REAL, &itimer, NULL);
815 } else {
816 interval = 0;
817 }
818 }
819
820 static int begin_multi_pcap_file(struct ctx *ctx)
821 {
822 int fd, ret;
823 char fname[256];
824
825 bug_on(!__pcap_io);
826
827 if (ctx->device_out[strlen(ctx->device_out) - 1] == '/')
828 ctx->device_out[strlen(ctx->device_out) - 1] = 0;
829
830 slprintf(fname, sizeof(fname), "%s/%s%lu.pcap", ctx->device_out,
831 ctx->prefix ? : "dump-", time(NULL));
832
833 fd = open_or_die_m(fname, O_RDWR | O_CREAT | O_TRUNC |
834 O_LARGEFILE, DEFFILEMODE);
835
836 ret = __pcap_io->push_fhdr_pcap(fd, ctx->magic, ctx->link_type);
837 if (ret)
838 panic("Error writing pcap header!\n");
839
840 if (__pcap_io->prepare_access_pcap) {
841 ret = __pcap_io->prepare_access_pcap(fd, PCAP_MODE_WR, true);
842 if (ret)
843 panic("Error prepare writing pcap!\n");
844 }
845
846 reset_interval(ctx);
847
848 return fd;
849 }
850
851 static void finish_single_pcap_file(struct ctx *ctx, int fd)
852 {
853 __pcap_io->fsync_pcap(fd);
854
855 if (__pcap_io->prepare_close_pcap)
856 __pcap_io->prepare_close_pcap(fd, PCAP_MODE_WR);
857
858 if (strncmp("-", ctx->device_out, strlen("-")))
859 close(fd);
860 else
861 dup2(fd, fileno(stdout));
862 }
863
864 static int begin_single_pcap_file(struct ctx *ctx)
865 {
866 int fd, ret;
867
868 bug_on(!__pcap_io);
869
870 if (!strncmp("-", ctx->device_out, strlen("-"))) {
871 fd = dup_or_die(fileno(stdout));
872 close(fileno(stdout));
873 if (ctx->pcap == PCAP_OPS_MM)
874 ctx->pcap = PCAP_OPS_SG;
875 } else {
876 fd = open_or_die_m(ctx->device_out,
877 O_RDWR | O_CREAT | O_TRUNC |
878 O_LARGEFILE, DEFFILEMODE);
879 }
880
881 ret = __pcap_io->push_fhdr_pcap(fd, ctx->magic, ctx->link_type);
882 if (ret)
883 panic("Error writing pcap header!\n");
884
885 if (__pcap_io->prepare_access_pcap) {
886 ret = __pcap_io->prepare_access_pcap(fd, PCAP_MODE_WR, true);
887 if (ret)
888 panic("Error prepare writing pcap!\n");
889 }
890
891 return fd;
892 }
893
894 static void update_pcap_next_dump(struct ctx *ctx, unsigned long snaplen,
895 int *fd, int sock, bool is_v3)
896 {
897 if (!dump_to_pcap(ctx))
898 return;
899
900 if (ctx->dump_mode == DUMP_INTERVAL_SIZE) {
901 interval += snaplen;
902 if (interval > ctx->dump_interval) {
903 next_dump = true;
904 interval = 0;
905 }
906 }
907
908 if (sighup) {
909 if (ctx->verbose)
910 printf("SIGHUP received, prematurely rotating pcap\n");
911 sighup = 0;
912 next_dump = true;
913 reset_interval(ctx);
914 }
915
916 if (next_dump) {
917 *fd = next_multi_pcap_file(ctx, *fd);
918 next_dump = false;
919
920 if (update_rx_stats(ctx, sock, is_v3))
921 return;
922
923 if (ctx->verbose && ctx->print_mode == PRINT_NONE)
924 printf(".(+%"PRIu64"/-%"PRIu64")",
925 ctx->pkts_recvd_last - ctx->pkts_drops_last,
926 ctx->pkts_drops_last);
927 }
928 }
929
930 #ifdef HAVE_TPACKET3
931 static void walk_t3_block(struct block_desc *pbd, struct ctx *ctx,
932 int sock, int *fd)
933 {
934 int num_pkts = pbd->h1.num_pkts, i;
935 struct tpacket3_hdr *hdr;
936 struct sockaddr_ll *sll;
937
938 hdr = (void *) ((uint8_t *) pbd + pbd->h1.offset_to_first_pkt);
939 sll = (void *) ((uint8_t *) hdr + TPACKET_ALIGN(sizeof(*hdr)));
940
941 for (i = 0; i < num_pkts && likely(sigint == 0); ++i) {
942 uint8_t *packet = ((uint8_t *) hdr + hdr->tp_mac);
943 pcap_pkthdr_t phdr;
944
945 if (ctx->packet_type != -1)
946 if (ctx->packet_type != sll->sll_pkttype)
947 goto next;
948
949 ctx->pkts_seen++;
950
951 if (dump_to_pcap(ctx)) {
952 int ret;
953
954 tpacket3_hdr_to_pcap_pkthdr(hdr, sll, &phdr, ctx->magic);
955
956 ret = __pcap_io->write_pcap(*fd, &phdr, ctx->magic, packet,
957 pcap_get_length(&phdr, ctx->magic));
958 if (unlikely(ret != (int) pcap_get_total_length(&phdr, ctx->magic)))
959 panic("Write error to pcap!\n");
960 }
961
962 __show_frame_hdr(packet, hdr->tp_snaplen, ctx->link_type, sll,
963 hdr, ctx->print_mode, true, ctx->pkts_seen);
964
965 dissector_entry_point(packet, hdr->tp_snaplen, ctx->link_type,
966 ctx->print_mode, sll);
967 next:
968 hdr = (void *) ((uint8_t *) hdr + hdr->tp_next_offset);
969 sll = (void *) ((uint8_t *) hdr + TPACKET_ALIGN(sizeof(*hdr)));
970
971 if (frame_count_max != 0) {
972 if (unlikely(ctx->pkts_seen >= frame_count_max)) {
973 sigint = 1;
974 break;
975 }
976 }
977
978 update_pcap_next_dump(ctx, hdr->tp_snaplen, fd, sock, true);
979 }
980 }
981 #endif /* HAVE_TPACKET3 */
982
983 static void recv_only_or_dump(struct ctx *ctx)
984 {
985 short ifflags = 0;
986 int sock, ifindex, fd = 0, ret;
987 size_t size;
988 unsigned int it = 0;
989 struct ring rx_ring;
990 struct pollfd rx_poll;
991 struct sock_fprog bpf_ops;
992 struct timeval start, end, diff;
993 bool is_v3 = is_defined(HAVE_TPACKET3);
994
995 sock = pf_socket_type(ctx->link_type);
996
997 ifindex = device_ifindex(ctx->device_in);
998 size = ring_size(ctx->device_in, ctx->reserve_size);
999
1000 enable_kernel_bpf_jit_compiler();
1001
1002 bpf_parse_rules(ctx->filter, &bpf_ops, ctx->link_type);
1003 if (ctx->dump_bpf)
1004 bpf_dump_all(&bpf_ops);
1005 bpf_attach_to_sock(sock, &bpf_ops);
1006
1007 if (ctx->hwtimestamp) {
1008 ret = set_sockopt_hwtimestamp(sock, ctx->device_in);
1009 if (ret == 0 && ctx->verbose)
1010 printf("HW timestamping enabled\n");
1011 }
1012
1013 ring_rx_setup(&rx_ring, sock, size, ifindex, &rx_poll, is_v3, true,
1014 ctx->verbose, ctx->fanout_group, ctx->fanout_type);
1015
1016 dissector_init_all(ctx->print_mode);
1017
1018 if (ctx->cpu >= 0 && ifindex > 0) {
1019 int irq = device_irq_number(ctx->device_in);
1020 device_set_irq_affinity(irq, ctx->cpu);
1021
1022 if (ctx->verbose)
1023 printf("IRQ: %s:%d > CPU%d\n",
1024 ctx->device_in, irq, ctx->cpu);
1025 }
1026
1027 if (ctx->promiscuous)
1028 ifflags = device_enter_promiscuous_mode(ctx->device_in);
1029
1030 if (dump_to_pcap(ctx) && __pcap_io->init_once_pcap)
1031 __pcap_io->init_once_pcap(true);
1032
1033 drop_privileges(ctx->enforce, ctx->uid, ctx->gid);
1034
1035 if (dump_to_pcap(ctx)) {
1036 struct stat stats;
1037
1038 ret = stat(ctx->device_out, &stats);
1039 if (ret < 0)
1040 ctx->dump_dir = 0;
1041 else
1042 ctx->dump_dir = S_ISDIR(stats.st_mode);
1043
1044 if (ctx->dump_dir)
1045 fd = begin_multi_pcap_file(ctx);
1046 else
1047 fd = begin_single_pcap_file(ctx);
1048 }
1049
1050 printf("Running! Hang up with ^C!\n\n");
1051 fflush(stdout);
1052
1053 bug_on(gettimeofday(&start, NULL));
1054
1055 while (likely(sigint == 0)) {
1056 #ifdef HAVE_TPACKET3
1057 struct block_desc *pbd;
1058
1059 while (user_may_pull_from_rx_block((pbd = rx_ring.frames[it].iov_base))) {
1060 walk_t3_block(pbd, ctx, sock, &fd);
1061
1062 kernel_may_pull_from_rx_block(pbd);
1063 it = (it + 1) % rx_ring.layout3.tp_block_nr;
1064
1065 if (unlikely(sigint == 1))
1066 break;
1067 }
1068 #else
1069 while (user_may_pull_from_rx(rx_ring.frames[it].iov_base)) {
1070 struct frame_map *hdr = rx_ring.frames[it].iov_base;
1071 uint8_t *packet = ((uint8_t *) hdr) + hdr->tp_h.tp_mac;
1072 pcap_pkthdr_t phdr;
1073
1074 if (ctx->packet_type != -1)
1075 if (ctx->packet_type != hdr->s_ll.sll_pkttype)
1076 goto next;
1077
1078 ctx->pkts_seen++;
1079
1080 if (unlikely(ring_frame_size(&rx_ring) < hdr->tp_h.tp_snaplen)) {
1081 /* XXX: silently ignore for now. We used to
1082 * report them with dump_rx_stats() */
1083 goto next;
1084 }
1085
1086 if (dump_to_pcap(ctx)) {
1087 tpacket_hdr_to_pcap_pkthdr(&hdr->tp_h, &hdr->s_ll, &phdr, ctx->magic);
1088
1089 ret = __pcap_io->write_pcap(fd, &phdr, ctx->magic, packet,
1090 pcap_get_length(&phdr, ctx->magic));
1091 if (unlikely(ret != (int) pcap_get_total_length(&phdr, ctx->magic)))
1092 panic("Write error to pcap!\n");
1093 }
1094
1095 show_frame_hdr(packet, hdr->tp_h.tp_snaplen,
1096 ctx->link_type, hdr, ctx->print_mode,
1097 ctx->pkts_seen);
1098
1099 dissector_entry_point(packet, hdr->tp_h.tp_snaplen,
1100 ctx->link_type, ctx->print_mode,
1101 &hdr->s_ll);
1102
1103 if (frame_count_max != 0) {
1104 if (unlikely(ctx->pkts_seen >= frame_count_max)) {
1105 sigint = 1;
1106 break;
1107 }
1108 }
1109
1110 next:
1111 kernel_may_pull_from_rx(&hdr->tp_h);
1112 it = (it + 1) % rx_ring.layout.tp_frame_nr;
1113
1114 if (unlikely(sigint == 1))
1115 break;
1116
1117 update_pcap_next_dump(ctx, hdr->tp_h.tp_snaplen, &fd,
1118 sock, is_v3);
1119 }
1120 #endif /* HAVE_TPACKET3 */
1121
1122 ret = poll(&rx_poll, 1, -1);
1123 if (unlikely(ret < 0)) {
1124 if (errno != EINTR)
1125 panic("Poll failed!\n");
1126 }
1127 }
1128
1129 bug_on(gettimeofday(&end, NULL));
1130 timersub(&end, &start, &diff);
1131
1132 dump_rx_stats(ctx, sock, is_v3);
1133 printf("\r%12lu sec, %lu usec in total\n",
1134 diff.tv_sec, diff.tv_usec);
1135
1136 bpf_release(&bpf_ops);
1137 dissector_cleanup_all();
1138 destroy_rx_ring(sock, &rx_ring);
1139
1140 if (ctx->promiscuous)
1141 device_leave_promiscuous_mode(ctx->device_in, ifflags);
1142
1143 if (ctx->rfraw)
1144 leave_rfmon_mac80211(ctx->device_in);
1145
1146 if (dump_to_pcap(ctx)) {
1147 if (ctx->dump_dir)
1148 finish_multi_pcap_file(ctx, fd);
1149 else
1150 finish_single_pcap_file(ctx, fd);
1151 }
1152
1153 close(sock);
1154 }
1155
1156 static void init_ctx(struct ctx *ctx)
1157 {
1158 memset(ctx, 0, sizeof(*ctx));
1159
1160 ctx->uid = getuid();
1161 ctx->gid = getgid();
1162
1163 ctx->cpu = -1;
1164 ctx->packet_type = -1;
1165
1166 ctx->fanout_type = PACKET_FANOUT_ROLLOVER;
1167
1168 ctx->magic = ORIGINAL_TCPDUMP_MAGIC;
1169 ctx->print_mode = PRINT_NORM;
1170 ctx->pcap = PCAP_OPS_SG;
1171
1172 ctx->dump_mode = DUMP_INTERVAL_TIME;
1173 ctx->dump_interval = 60;
1174
1175 ctx->promiscuous = true;
1176 ctx->randomize = false;
1177 ctx->hwtimestamp = true;
1178
1179 ctx->pkts_recvd = 0;
1180 ctx->pkts_seen = 0;
1181 ctx->pkts_drops = 0;
1182 ctx->pkts_recvd_last = 0;
1183 ctx->pkts_drops_last = 0;
1184 }
1185
1186 static void destroy_ctx(struct ctx *ctx)
1187 {
1188 free(ctx->device_in);
1189 free(ctx->device_out);
1190 free(ctx->device_trans);
1191
1192 free(ctx->prefix);
1193 }
1194
1195 static void __noreturn help(void)
1196 {
1197 printf("netsniff-ng %s, the packet sniffing beast\n", VERSION_STRING);
1198 puts("http://www.netsniff-ng.org\n\n"
1199 "Usage: netsniff-ng [options] [filter-expression]\n"
1200 "Options:\n"
1201 " -i|-d|--dev|--in <dev|pcap|-> Input source as netdev, pcap or pcap stdin\n"
1202 " -o|--out <dev|pcap|dir|cfg|-> Output sink as netdev, pcap, directory, trafgen, or stdout\n"
1203 " -C|--fanout-group <id> Join packet fanout group\n"
1204 " -K|--fanout-type <type> Apply fanout discipline: hash|lb|cpu|rnd|roll|qm\n"
1205 " -L|--fanout-opts <opts> Additional fanout options: defrag|roll\n"
1206 " -f|--filter <bpf-file|-|expr> Use BPF filter from bpfc file/stdin or tcpdump-like expression\n"
1207 " -t|--type <type> Filter for: host|broadcast|multicast|others|outgoing\n"
1208 " -F|--interval <size|time> Dump interval if -o is a dir: <num>KiB/MiB/GiB/s/sec/min/hrs\n"
1209 " -R|--rfraw Capture or inject raw 802.11 frames\n"
1210 " -n|--num <0|uint> Number of packets until exit (def: 0)\n"
1211 " -P|--prefix <name> Prefix for pcaps stored in directory\n"
1212 " -T|--magic <pcap-magic> Pcap magic number/pcap format to store, see -D\n"
1213 " -w|--cooked Use Linux \"cooked\" header instead of link header\n"
1214 " -D|--dump-pcap-types Dump pcap types and magic numbers and quit\n"
1215 " -B|--dump-bpf Dump generated BPF assembly\n"
1216 " -r|--rand Randomize packet forwarding order (dev->dev)\n"
1217 " -M|--no-promisc No promiscuous mode for netdev\n"
1218 " -A|--no-sock-mem Don't tune core socket memory\n"
1219 " -N|--no-hwtimestamp Disable hardware time stamping\n"
1220 " -m|--mmap Mmap(2) pcap file I/O, e.g. for replaying pcaps\n"
1221 " -G|--sg Scatter/gather pcap file I/O\n"
1222 " -c|--clrw Use slower read(2)/write(2) I/O\n"
1223 " -S|--ring-size <size> Specify ring size to: <num>KiB/MiB/GiB\n"
1224 " -k|--kernel-pull <uint> Kernel pull from user interval in us (def: 10us)\n"
1225 " -J|--jumbo-support Support replay/fwd 64KB Super Jumbo Frames (def: 2048B)\n"
1226 " -b|--bind-cpu <cpu> Bind to specific CPU\n"
1227 " -u|--user <userid> Drop privileges and change to userid\n"
1228 " -g|--group <groupid> Drop privileges and change to groupid\n"
1229 " -H|--prio-high Make this high priority process\n"
1230 " -Q|--notouch-irq Do not touch IRQ CPU affinity of NIC\n"
1231 " -s|--silent Do not print captured packets\n"
1232 " -q|--less Print less-verbose packet information\n"
1233 " -X|--hex Print packet data in hex format\n"
1234 " -l|--ascii Print human-readable packet data\n"
1235 " -U|--update Update GeoIP databases\n"
1236 " -V|--verbose Be more verbose\n"
1237 " -v|--version Show version and exit\n"
1238 " -h|--help Guess what?!\n\n"
1239 "Examples:\n"
1240 " netsniff-ng --in eth0 --out dump.pcap -s -T 0xa1b2c3d4 --b 0 tcp or udp\n"
1241 " netsniff-ng --in wlan0 --rfraw --out dump.pcap --silent --bind-cpu 0\n"
1242 " netsniff-ng --in dump.pcap --mmap --out eth0 -k1000 --silent --bind-cpu 0\n"
1243 " netsniff-ng --in dump.pcap --out dump.cfg --silent --bind-cpu 0\n"
1244 " netsniff-ng --in dump.pcap --out dump2.pcap --silent tcp\n"
1245 " netsniff-ng --in eth0 --out eth1 --silent --bind-cpu 0 -J --type host\n"
1246 " netsniff-ng --in eth1 --out /opt/probe/ -s -m --interval 100MiB -b 0\n"
1247 " netsniff-ng --in vlan0 --out dump.pcap -c -u `id -u bob` -g `id -g bob`\n"
1248 " netsniff-ng --in any --filter http.bpf --jumbo-support --ascii -V\n\n"
1249 "Note:\n"
1250 " For introducing bit errors, delays with random variation and more\n"
1251 " while replaying pcaps, make use of tc(8) with its disciplines (e.g. netem).\n");
1252 puts(copyright);
1253 die();
1254 }
1255
1256 static void __noreturn version(void)
1257 {
1258 printf("netsniff-ng %s, Git id: %s\n", VERSION_LONG, GITVERSION);
1259 puts("the packet sniffing beast\n"
1260 "http://www.netsniff-ng.org\n");
1261 puts(copyright);
1262 die();
1263 }
1264
1265 int main(int argc, char **argv)
1266 {
1267 char *ptr;
1268 int c, i, j, cpu_tmp, opt_index, ops_touched = 0, vals[4] = {0};
1269 bool prio_high = false, setsockmem = true;
1270 void (*main_loop)(struct ctx *ctx) = NULL;
1271 struct ctx ctx;
1272
1273 init_ctx(&ctx);
1274 start_time = time(NULL);
1275 srand(start_time);
1276
1277 while ((c = getopt_long(argc, argv, short_options, long_options,
1278 &opt_index)) != EOF) {
1279 switch (c) {
1280 case 'd':
1281 case 'i':
1282 ctx.device_in = xstrdup(optarg);
1283 break;
1284 case 'o':
1285 ctx.device_out = xstrdup(optarg);
1286 break;
1287 case 'P':
1288 ctx.prefix = xstrdup(optarg);
1289 break;
1290 case 'R':
1291 ctx.rfraw = 1;
1292 break;
1293 case 'r':
1294 ctx.randomize = true;
1295 break;
1296 case 'J':
1297 ctx.jumbo = true;
1298 break;
1299 case 'T':
1300 ctx.magic = (uint32_t) strtoul(optarg, NULL, 0);
1301 pcap_check_magic(ctx.magic);
1302 break;
1303 case 'f':
1304 ctx.filter = xstrdup(optarg);
1305 break;
1306 case 'M':
1307 ctx.promiscuous = false;
1308 break;
1309 case 'N':
1310 ctx.hwtimestamp = false;
1311 break;
1312 case 'A':
1313 setsockmem = false;
1314 break;
1315 case 'u':
1316 ctx.uid = strtoul(optarg, NULL, 0);
1317 ctx.enforce = true;
1318 break;
1319 case 'g':
1320 ctx.gid = strtoul(optarg, NULL, 0);
1321 ctx.enforce = true;
1322 break;
1323 case 'C':
1324 ctx.fanout_group = strtoul(optarg, NULL, 0);
1325 if (ctx.fanout_group == 0)
1326 panic("Non-zero fanout group id required!\n");
1327 break;
1328 case 'K':
1329 if (!strncmp(optarg, "hash", strlen("hash")))
1330 ctx.fanout_type = PACKET_FANOUT_HASH;
1331 else if (!strncmp(optarg, "lb", strlen("lb")) ||
1332 !strncmp(optarg, "rr", strlen("rr")))
1333 ctx.fanout_type = PACKET_FANOUT_LB;
1334 else if (!strncmp(optarg, "cpu", strlen("cpu")))
1335 ctx.fanout_type = PACKET_FANOUT_CPU;
1336 else if (!strncmp(optarg, "rnd", strlen("rnd")))
1337 ctx.fanout_type = PACKET_FANOUT_RND;
1338 else if (!strncmp(optarg, "roll", strlen("roll")))
1339 ctx.fanout_type = PACKET_FANOUT_ROLLOVER;
1340 else if (!strncmp(optarg, "qm", strlen("qm")))
1341 ctx.fanout_type = PACKET_FANOUT_QM;
1342 else
1343 panic("Unknown fanout type!\n");
1344 break;
1345 case 'L':
1346 if (!strncmp(optarg, "defrag", strlen("defrag")))
1347 ctx.fanout_type |= PACKET_FANOUT_FLAG_DEFRAG;
1348 else if (!strncmp(optarg, "roll", strlen("roll")))
1349 ctx.fanout_type |= PACKET_FANOUT_FLAG_ROLLOVER;
1350 else
1351 panic("Unknown fanout option!\n");
1352 break;
1353 case 't':
1354 if (!strncmp(optarg, "host", strlen("host")))
1355 ctx.packet_type = PACKET_HOST;
1356 else if (!strncmp(optarg, "broadcast", strlen("broadcast")))
1357 ctx.packet_type = PACKET_BROADCAST;
1358 else if (!strncmp(optarg, "multicast", strlen("multicast")))
1359 ctx.packet_type = PACKET_MULTICAST;
1360 else if (!strncmp(optarg, "others", strlen("others")))
1361 ctx.packet_type = PACKET_OTHERHOST;
1362 else if (!strncmp(optarg, "outgoing", strlen("outgoing")))
1363 ctx.packet_type = PACKET_OUTGOING;
1364 else
1365 ctx.packet_type = -1;
1366 break;
1367 case 'S':
1368 ptr = optarg;
1369 for (j = i = strlen(optarg); i > 0; --i) {
1370 if (!isdigit(optarg[j - i]))
1371 break;
1372 ptr++;
1373 }
1374
1375 if (!strncmp(ptr, "KiB", strlen("KiB")))
1376 ctx.reserve_size = 1 << 10;
1377 else if (!strncmp(ptr, "MiB", strlen("MiB")))
1378 ctx.reserve_size = 1 << 20;
1379 else if (!strncmp(ptr, "GiB", strlen("GiB")))
1380 ctx.reserve_size = 1 << 30;
1381 else
1382 panic("Syntax error in ring size param!\n");
1383
1384 ctx.reserve_size *= strtoul(optarg, NULL, 0);
1385 break;
1386 case 'b':
1387 cpu_tmp = strtol(optarg, NULL, 0);
1388
1389 cpu_affinity(cpu_tmp);
1390 if (ctx.cpu != -2)
1391 ctx.cpu = cpu_tmp;
1392 break;
1393 case 'H':
1394 prio_high = true;
1395 break;
1396 case 'c':
1397 ctx.pcap = PCAP_OPS_RW;
1398 ops_touched = 1;
1399 break;
1400 case 'm':
1401 ctx.pcap = PCAP_OPS_MM;
1402 ops_touched = 1;
1403 break;
1404 case 'G':
1405 ctx.pcap = PCAP_OPS_SG;
1406 ops_touched = 1;
1407 break;
1408 case 'Q':
1409 ctx.cpu = -2;
1410 break;
1411 case 's':
1412 ctx.print_mode = PRINT_NONE;
1413 break;
1414 case 'q':
1415 ctx.print_mode = PRINT_LESS;
1416 break;
1417 case 'X':
1418 ctx.print_mode =
1419 (ctx.print_mode == PRINT_ASCII) ?
1420 PRINT_HEX_ASCII : PRINT_HEX;
1421 break;
1422 case 'l':
1423 ctx.print_mode =
1424 (ctx.print_mode == PRINT_HEX) ?
1425 PRINT_HEX_ASCII : PRINT_ASCII;
1426 break;
1427 case 'k':
1428 ctx.kpull = strtoul(optarg, NULL, 0);
1429 break;
1430 case 'n':
1431 frame_count_max = strtoul(optarg, NULL, 0);
1432 break;
1433 case 'F':
1434 ptr = optarg;
1435 for (j = i = strlen(optarg); i > 0; --i) {
1436 if (!isdigit(optarg[j - i]))
1437 break;
1438 ptr++;
1439 }
1440
1441 if (!strncmp(ptr, "KiB", strlen("KiB"))) {
1442 ctx.dump_interval = 1 << 10;
1443 ctx.dump_mode = DUMP_INTERVAL_SIZE;
1444 } else if (!strncmp(ptr, "MiB", strlen("MiB"))) {
1445 ctx.dump_interval = 1 << 20;
1446 ctx.dump_mode = DUMP_INTERVAL_SIZE;
1447 } else if (!strncmp(ptr, "GiB", strlen("GiB"))) {
1448 ctx.dump_interval = 1 << 30;
1449 ctx.dump_mode = DUMP_INTERVAL_SIZE;
1450 } else if (!strncmp(ptr, "sec", strlen("sec"))) {
1451 ctx.dump_interval = 1;
1452 ctx.dump_mode = DUMP_INTERVAL_TIME;
1453 } else if (!strncmp(ptr, "min", strlen("min"))) {
1454 ctx.dump_interval = 60;
1455 ctx.dump_mode = DUMP_INTERVAL_TIME;
1456 } else if (!strncmp(ptr, "hrs", strlen("hrs"))) {
1457 ctx.dump_interval = 60 * 60;
1458 ctx.dump_mode = DUMP_INTERVAL_TIME;
1459 } else if (!strncmp(ptr, "s", strlen("s"))) {
1460 ctx.dump_interval = 1;
1461 ctx.dump_mode = DUMP_INTERVAL_TIME;
1462 } else {
1463 panic("Syntax error in time/size param!\n");
1464 }
1465
1466 ctx.dump_interval *= strtoul(optarg, NULL, 0);
1467 break;
1468 case 'V':
1469 ctx.verbose = true;
1470 break;
1471 case 'B':
1472 ctx.dump_bpf = true;
1473 break;
1474 case 'D':
1475 pcap_dump_type_features();
1476 die();
1477 break;
1478 case 'U':
1479 update_geoip();
1480 die();
1481 break;
1482 case 'w':
1483 ctx.link_type = LINKTYPE_LINUX_SLL;
1484 break;
1485 case 'v':
1486 version();
1487 break;
1488 case 'h':
1489 help();
1490 break;
1491 case '?':
1492 switch (optopt) {
1493 case 'd':
1494 case 'i':
1495 case 'o':
1496 case 'f':
1497 case 't':
1498 case 'P':
1499 case 'F':
1500 case 'n':
1501 case 'S':
1502 case 'b':
1503 case 'k':
1504 case 'T':
1505 case 'u':
1506 case 'g':
1507 case 'e':
1508 panic("Option -%c requires an argument!\n",
1509 optopt);
1510 default:
1511 if (isprint(optopt))
1512 printf("Unknown option character `0x%X\'!\n", optopt);
1513 die();
1514 }
1515 default:
1516 break;
1517 }
1518 }
1519
1520 if (!ctx.filter && optind != argc)
1521 ctx.filter = argv2str(optind, argc, argv);
1522
1523 if (!ctx.device_in)
1524 ctx.device_in = xstrdup("any");
1525
1526 register_signal(SIGINT, signal_handler);
1527 register_signal(SIGQUIT, signal_handler);
1528 register_signal(SIGTERM, signal_handler);
1529 register_signal(SIGHUP, signal_handler);
1530
1531 tprintf_init();
1532
1533 if (prio_high) {
1534 set_proc_prio(-20);
1535 set_sched_status(SCHED_FIFO, sched_get_priority_max(SCHED_FIFO));
1536 }
1537
1538 if (device_mtu(ctx.device_in) || !strncmp("any", ctx.device_in, strlen(ctx.device_in))) {
1539 if (ctx.rfraw)
1540 setup_rfmon_mac80211_dev(&ctx, &ctx.device_in);
1541
1542 if (!ctx.link_type)
1543 ctx.link_type = pcap_dev_to_linktype(ctx.device_in);
1544 if (link_has_sll_hdr(ctx.link_type)) {
1545 switch (ctx.magic) {
1546 case ORIGINAL_TCPDUMP_MAGIC:
1547 ctx.magic = ORIGINAL_TCPDUMP_MAGIC_LL;
1548 break;
1549 case NSEC_TCPDUMP_MAGIC:
1550 ctx.magic = NSEC_TCPDUMP_MAGIC_LL;
1551 break;
1552 case ___constant_swab32(ORIGINAL_TCPDUMP_MAGIC):
1553 ctx.magic = ___constant_swab32(ORIGINAL_TCPDUMP_MAGIC_LL);
1554 break;
1555 case ___constant_swab32(NSEC_TCPDUMP_MAGIC):
1556 ctx.magic = ___constant_swab32(NSEC_TCPDUMP_MAGIC_LL);
1557 break;
1558 }
1559 }
1560
1561
1562 if (!ctx.device_out) {
1563 ctx.dump = 0;
1564 main_loop = recv_only_or_dump;
1565 } else if (device_mtu(ctx.device_out)) {
1566 register_signal_f(SIGALRM, timer_elapsed, SA_SIGINFO);
1567 main_loop = receive_to_xmit;
1568 } else {
1569 ctx.dump = 1;
1570 register_signal_f(SIGALRM, timer_next_dump, SA_SIGINFO);
1571 main_loop = recv_only_or_dump;
1572 if (!ops_touched)
1573 ctx.pcap = PCAP_OPS_SG;
1574 }
1575 } else {
1576 if (ctx.device_out && device_mtu(ctx.device_out)) {
1577 register_signal_f(SIGALRM, timer_elapsed, SA_SIGINFO);
1578 main_loop = pcap_to_xmit;
1579 if (!ops_touched)
1580 ctx.pcap = PCAP_OPS_MM;
1581 } else {
1582 setsockmem = false;
1583 main_loop = read_pcap;
1584 if (!ops_touched)
1585 ctx.pcap = PCAP_OPS_SG;
1586 }
1587 }
1588
1589 bug_on(!main_loop);
1590
1591 init_geoip(0);
1592 if (setsockmem)
1593 set_system_socket_memory(vals, array_size(vals));
1594 if (!ctx.enforce)
1595 xlockme();
1596
1597 if (ctx.verbose)
1598 printf("pcap file I/O method: %s\n", pcap_ops_group_to_str[ctx.pcap]);
1599
1600 main_loop(&ctx);
1601
1602 if (!ctx.enforce)
1603 xunlockme();
1604 if (setsockmem)
1605 reset_system_socket_memory(vals, array_size(vals));
1606 destroy_geoip();
1607
1608 device_restore_irq_affinity_list();
1609 tprintf_cleanup();
1610
1611 destroy_ctx(&ctx);
1612 return 0;
1613 }
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