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.
16 #include <sys/socket.h>
17 #include <sys/types.h>
20 #include <sys/fsuid.h>
37 #include "dissector.h"
46 char *device_in
, *device_out
, *device_trans
, *filter
, *prefix
;
47 int cpu
, rfraw
, dump
, print_mode
, dump_dir
, packet_type
, verbose
;
48 unsigned long kpull
, dump_interval
, reserve_size
, tx_bytes
, tx_packets
;
49 bool randomize
, promiscuous
, enforce
, jumbo
, dump_bpf
;
50 enum pcap_ops_groups pcap
; enum dump_mode dump_mode
;
51 uid_t uid
; gid_t gid
; uint32_t link_type
, magic
;
54 volatile sig_atomic_t sigint
= 0;
56 static volatile bool next_dump
= false;
58 static const char *short_options
= "d:i:o:rf:MJt:S:k:n:b:HQmcsqXlvhF:RGAP:Vu:g:T:DB";
59 static const struct option long_options
[] = {
60 {"dev", required_argument
, NULL
, 'd'},
61 {"in", required_argument
, NULL
, 'i'},
62 {"out", required_argument
, NULL
, 'o'},
63 {"filter", required_argument
, NULL
, 'f'},
64 {"num", required_argument
, NULL
, 'n'},
65 {"type", required_argument
, NULL
, 't'},
66 {"interval", required_argument
, NULL
, 'F'},
67 {"ring-size", required_argument
, NULL
, 'S'},
68 {"kernel-pull", required_argument
, NULL
, 'k'},
69 {"bind-cpu", required_argument
, NULL
, 'b'},
70 {"prefix", required_argument
, NULL
, 'P'},
71 {"user", required_argument
, NULL
, 'u'},
72 {"group", required_argument
, NULL
, 'g'},
73 {"magic", required_argument
, NULL
, 'T'},
74 {"rand", no_argument
, NULL
, 'r'},
75 {"rfraw", no_argument
, NULL
, 'R'},
76 {"mmap", no_argument
, NULL
, 'm'},
77 {"sg", no_argument
, NULL
, 'G'},
78 {"clrw", no_argument
, NULL
, 'c'},
79 {"jumbo-support", no_argument
, NULL
, 'J'},
80 {"no-promisc", no_argument
, NULL
, 'M'},
81 {"prio-high", no_argument
, NULL
, 'H'},
82 {"notouch-irq", no_argument
, NULL
, 'Q'},
83 {"dump-pcap-types", no_argument
, NULL
, 'D'},
84 {"dump-bpf", no_argument
, NULL
, 'B'},
85 {"silent", no_argument
, NULL
, 's'},
86 {"less", no_argument
, NULL
, 'q'},
87 {"hex", no_argument
, NULL
, 'X'},
88 {"ascii", no_argument
, NULL
, 'l'},
89 {"no-sock-mem", no_argument
, NULL
, 'A'},
90 {"update", no_argument
, NULL
, 'U'},
91 {"verbose", no_argument
, NULL
, 'V'},
92 {"version", no_argument
, NULL
, 'v'},
93 {"help", no_argument
, NULL
, 'h'},
99 static struct itimerval itimer
;
101 static unsigned long frame_count_max
= 0, interval
= TX_KERNEL_PULL_INT
;
103 #define __pcap_io pcap_ops[ctx->pcap]
105 static void signal_handler(int number
)
116 static void timer_elapsed(int unused
)
120 set_itimer_interval_value(&itimer
, 0, interval
);
122 ret
= pull_and_flush_tx_ring(tx_sock
);
123 if (unlikely(ret
< 0)) {
124 /* We could hit EBADF if the socket has been closed before
125 * the timer was triggered.
127 if (errno
!= EBADF
&& errno
!= ENOBUFS
)
128 panic("Flushing TX_RING failed: %s!\n", strerror(errno
));
131 setitimer(ITIMER_REAL
, &itimer
, NULL
);
134 static void timer_next_dump(int unused
)
136 set_itimer_interval_value(&itimer
, interval
, 0);
138 setitimer(ITIMER_REAL
, &itimer
, NULL
);
141 static inline bool dump_to_pcap(struct ctx
*ctx
)
146 static void pcap_to_xmit(struct ctx
*ctx
)
150 int irq
, ifindex
, fd
= 0, ret
;
151 unsigned int size
, it
= 0;
152 unsigned long trunced
= 0;
154 struct frame_map
*hdr
;
155 struct sock_fprog bpf_ops
;
156 struct timeval start
, end
, diff
;
159 if (!device_up_and_running(ctx
->device_out
) && !ctx
->rfraw
)
160 panic("Device not up and running!\n");
164 tx_sock
= pf_socket();
166 if (!strncmp("-", ctx
->device_in
, strlen("-"))) {
167 fd
= dup(fileno(stdin
));
168 close(fileno(stdin
));
169 if (ctx
->pcap
== PCAP_OPS_MM
)
170 ctx
->pcap
= PCAP_OPS_SG
;
172 fd
= open_or_die(ctx
->device_in
, O_RDONLY
| O_LARGEFILE
| O_NOATIME
);
175 ret
= __pcap_io
->pull_fhdr_pcap(fd
, &ctx
->magic
, &ctx
->link_type
);
177 panic("Error reading pcap header!\n");
179 if (__pcap_io
->prepare_access_pcap
) {
180 ret
= __pcap_io
->prepare_access_pcap(fd
, PCAP_MODE_RD
, ctx
->jumbo
);
182 panic("Error prepare reading pcap!\n");
185 fmemset(&tx_ring
, 0, sizeof(tx_ring
));
186 fmemset(&bpf_ops
, 0, sizeof(bpf_ops
));
189 ctx
->device_trans
= xstrdup(ctx
->device_out
);
190 xfree(ctx
->device_out
);
192 enter_rfmon_mac80211(ctx
->device_trans
, &ctx
->device_out
);
193 if (ctx
->link_type
!= LINKTYPE_IEEE802_11
)
194 panic("Wrong linktype of pcap!\n");
197 ifindex
= device_ifindex(ctx
->device_out
);
199 size
= ring_size(ctx
->device_out
, ctx
->reserve_size
);
201 bpf_parse_rules(ctx
->filter
, &bpf_ops
, ctx
->link_type
);
203 bpf_dump_all(&bpf_ops
);
205 set_packet_loss_discard(tx_sock
);
206 set_sockopt_hwtimestamp(tx_sock
, ctx
->device_out
);
208 setup_tx_ring_layout(tx_sock
, &tx_ring
, size
, ctx
->jumbo
);
209 create_tx_ring(tx_sock
, &tx_ring
, ctx
->verbose
);
210 mmap_tx_ring(tx_sock
, &tx_ring
);
211 alloc_tx_ring_frames(&tx_ring
);
212 bind_tx_ring(tx_sock
, &tx_ring
, ifindex
);
214 dissector_init_all(ctx
->print_mode
);
216 if (ctx
->cpu
>= 0 && ifindex
> 0) {
217 irq
= device_irq_number(ctx
->device_out
);
218 device_bind_irq_to_cpu(irq
, ctx
->cpu
);
221 printf("IRQ: %s:%d > CPU%d\n",
222 ctx
->device_out
, irq
, ctx
->cpu
);
226 interval
= ctx
->kpull
;
228 set_itimer_interval_value(&itimer
, 0, interval
);
229 setitimer(ITIMER_REAL
, &itimer
, NULL
);
231 drop_privileges(ctx
->enforce
, ctx
->uid
, ctx
->gid
);
233 printf("Running! Hang up with ^C!\n\n");
236 bug_on(gettimeofday(&start
, NULL
));
238 while (likely(sigint
== 0)) {
239 while (user_may_pull_from_tx(tx_ring
.frames
[it
].iov_base
)) {
240 hdr
= tx_ring
.frames
[it
].iov_base
;
241 out
= ((uint8_t *) hdr
) + TPACKET2_HDRLEN
- sizeof(struct sockaddr_ll
);
244 ret
= __pcap_io
->read_pcap(fd
, &phdr
, ctx
->magic
, out
,
245 ring_frame_size(&tx_ring
));
246 if (unlikely(ret
<= 0))
249 if (ring_frame_size(&tx_ring
) <
250 pcap_get_length(&phdr
, ctx
->magic
)) {
251 pcap_set_length(&phdr
, ctx
->magic
,
252 ring_frame_size(&tx_ring
));
255 } while (ctx
->filter
&&
256 !bpf_run_filter(&bpf_ops
, out
,
257 pcap_get_length(&phdr
, ctx
->magic
)));
259 pcap_pkthdr_to_tpacket_hdr(&phdr
, ctx
->magic
, &hdr
->tp_h
, &hdr
->s_ll
);
261 ctx
->tx_bytes
+= hdr
->tp_h
.tp_len
;;
264 show_frame_hdr(hdr
, ctx
->print_mode
);
266 dissector_entry_point(out
, hdr
->tp_h
.tp_snaplen
,
267 ctx
->link_type
, ctx
->print_mode
);
269 kernel_may_pull_from_tx(&hdr
->tp_h
);
272 if (it
>= tx_ring
.layout
.tp_frame_nr
)
275 if (unlikely(sigint
== 1))
278 if (frame_count_max
!= 0) {
279 if (ctx
->tx_packets
>= frame_count_max
) {
289 bug_on(gettimeofday(&end
, NULL
));
290 timersub(&end
, &start
, &diff
);
292 bpf_release(&bpf_ops
);
294 dissector_cleanup_all();
295 destroy_tx_ring(tx_sock
, &tx_ring
);
298 leave_rfmon_mac80211(ctx
->device_trans
, ctx
->device_out
);
300 if (__pcap_io
->prepare_close_pcap
)
301 __pcap_io
->prepare_close_pcap(fd
, PCAP_MODE_RD
);
303 if (!strncmp("-", ctx
->device_in
, strlen("-")))
304 dup2(fd
, fileno(stdin
));
311 printf("\r%12lu packets outgoing\n", ctx
->tx_packets
);
312 printf("\r%12lu packets truncated in file\n", trunced
);
313 printf("\r%12lu bytes outgoing\n", ctx
->tx_bytes
);
314 printf("\r%12lu sec, %lu usec in total\n", diff
.tv_sec
, diff
.tv_usec
);
317 static void receive_to_xmit(struct ctx
*ctx
)
321 int rx_sock
, ifindex_in
, ifindex_out
;
322 unsigned int size_in
, size_out
, it_in
= 0, it_out
= 0;
323 unsigned long frame_count
= 0;
324 struct frame_map
*hdr_in
, *hdr_out
;
325 struct ring tx_ring
, rx_ring
;
326 struct pollfd rx_poll
;
327 struct sock_fprog bpf_ops
;
329 if (!strncmp(ctx
->device_in
, ctx
->device_out
, IFNAMSIZ
))
330 panic("Ingress/egress devices must be different!\n");
331 if (!device_up_and_running(ctx
->device_out
))
332 panic("Egress device not up and running!\n");
333 if (!device_up_and_running(ctx
->device_in
))
334 panic("Ingress device not up and running!\n");
336 rx_sock
= pf_socket();
337 tx_sock
= pf_socket();
339 fmemset(&tx_ring
, 0, sizeof(tx_ring
));
340 fmemset(&rx_ring
, 0, sizeof(rx_ring
));
341 fmemset(&rx_poll
, 0, sizeof(rx_poll
));
342 fmemset(&bpf_ops
, 0, sizeof(bpf_ops
));
344 ifindex_in
= device_ifindex(ctx
->device_in
);
345 ifindex_out
= device_ifindex(ctx
->device_out
);
347 size_in
= ring_size(ctx
->device_in
, ctx
->reserve_size
);
348 size_out
= ring_size(ctx
->device_out
, ctx
->reserve_size
);
350 enable_kernel_bpf_jit_compiler();
352 bpf_parse_rules(ctx
->filter
, &bpf_ops
, ctx
->link_type
);
354 bpf_dump_all(&bpf_ops
);
355 bpf_attach_to_sock(rx_sock
, &bpf_ops
);
357 setup_rx_ring_layout(rx_sock
, &rx_ring
, size_in
, ctx
->jumbo
);
358 create_rx_ring(rx_sock
, &rx_ring
, ctx
->verbose
);
359 mmap_rx_ring(rx_sock
, &rx_ring
);
360 alloc_rx_ring_frames(&rx_ring
);
361 bind_rx_ring(rx_sock
, &rx_ring
, ifindex_in
);
362 prepare_polling(rx_sock
, &rx_poll
);
364 set_packet_loss_discard(tx_sock
);
365 setup_tx_ring_layout(tx_sock
, &tx_ring
, size_out
, ctx
->jumbo
);
366 create_tx_ring(tx_sock
, &tx_ring
, ctx
->verbose
);
367 mmap_tx_ring(tx_sock
, &tx_ring
);
368 alloc_tx_ring_frames(&tx_ring
);
369 bind_tx_ring(tx_sock
, &tx_ring
, ifindex_out
);
371 dissector_init_all(ctx
->print_mode
);
373 if (ctx
->promiscuous
)
374 ifflags
= enter_promiscuous_mode(ctx
->device_in
);
377 interval
= ctx
->kpull
;
379 set_itimer_interval_value(&itimer
, 0, interval
);
380 setitimer(ITIMER_REAL
, &itimer
, NULL
);
382 drop_privileges(ctx
->enforce
, ctx
->uid
, ctx
->gid
);
384 printf("Running! Hang up with ^C!\n\n");
387 while (likely(sigint
== 0)) {
388 while (user_may_pull_from_rx(rx_ring
.frames
[it_in
].iov_base
)) {
391 hdr_in
= rx_ring
.frames
[it_in
].iov_base
;
392 in
= ((uint8_t *) hdr_in
) + hdr_in
->tp_h
.tp_mac
;
396 if (ctx
->packet_type
!= -1)
397 if (ctx
->packet_type
!= hdr_in
->s_ll
.sll_pkttype
)
400 hdr_out
= tx_ring
.frames
[it_out
].iov_base
;
401 out
= ((uint8_t *) hdr_out
) + TPACKET2_HDRLEN
- sizeof(struct sockaddr_ll
);
403 for (; !user_may_pull_from_tx(tx_ring
.frames
[it_out
].iov_base
) &&
406 next_rnd_slot(&it_out
, &tx_ring
);
409 if (it_out
>= tx_ring
.layout
.tp_frame_nr
)
413 hdr_out
= tx_ring
.frames
[it_out
].iov_base
;
414 out
= ((uint8_t *) hdr_out
) + TPACKET2_HDRLEN
- sizeof(struct sockaddr_ll
);
417 tpacket_hdr_clone(&hdr_out
->tp_h
, &hdr_in
->tp_h
);
418 fmemcpy(out
, in
, hdr_in
->tp_h
.tp_len
);
420 kernel_may_pull_from_tx(&hdr_out
->tp_h
);
422 next_rnd_slot(&it_out
, &tx_ring
);
425 if (it_out
>= tx_ring
.layout
.tp_frame_nr
)
429 show_frame_hdr(hdr_in
, ctx
->print_mode
);
431 dissector_entry_point(in
, hdr_in
->tp_h
.tp_snaplen
,
432 ctx
->link_type
, ctx
->print_mode
);
434 if (frame_count_max
!= 0) {
435 if (frame_count
>= frame_count_max
) {
443 kernel_may_pull_from_rx(&hdr_in
->tp_h
);
446 if (it_in
>= rx_ring
.layout
.tp_frame_nr
)
449 if (unlikely(sigint
== 1))
453 poll(&rx_poll
, 1, -1);
458 sock_print_net_stats(rx_sock
, 0);
460 bpf_release(&bpf_ops
);
462 dissector_cleanup_all();
464 destroy_tx_ring(tx_sock
, &tx_ring
);
465 destroy_rx_ring(rx_sock
, &rx_ring
);
467 if (ctx
->promiscuous
)
468 leave_promiscuous_mode(ctx
->device_in
, ifflags
);
474 static void translate_pcap_to_txf(int fdo
, uint8_t *out
, size_t len
)
476 size_t bytes_done
= 0;
479 slprintf(bout
, sizeof(bout
), "{\n ");
480 write_or_die(fdo
, bout
, strlen(bout
));
482 while (bytes_done
< len
) {
483 slprintf(bout
, sizeof(bout
), "0x%02x, ", out
[bytes_done
]);
484 write_or_die(fdo
, bout
, strlen(bout
));
488 if (bytes_done
% 10 == 0) {
489 slprintf(bout
, sizeof(bout
), "\n");
490 write_or_die(fdo
, bout
, strlen(bout
));
492 if (bytes_done
< len
) {
493 slprintf(bout
, sizeof(bout
), " ");
494 write_or_die(fdo
, bout
, strlen(bout
));
498 if (bytes_done
% 10 != 0) {
499 slprintf(bout
, sizeof(bout
), "\n");
500 write_or_die(fdo
, bout
, strlen(bout
));
503 slprintf(bout
, sizeof(bout
), "}\n\n");
504 write_or_die(fdo
, bout
, strlen(bout
));
507 static void read_pcap(struct ctx
*ctx
)
511 int ret
, fd
, fdo
= 0;
512 unsigned long trunced
= 0;
515 struct sock_fprog bpf_ops
;
517 struct timeval start
, end
, diff
;
518 struct sockaddr_ll sll
;
522 if (!strncmp("-", ctx
->device_in
, strlen("-"))) {
523 fd
= dup(fileno(stdin
));
524 close(fileno(stdin
));
525 if (ctx
->pcap
== PCAP_OPS_MM
)
526 ctx
->pcap
= PCAP_OPS_SG
;
528 fd
= open_or_die(ctx
->device_in
, O_RDONLY
| O_LARGEFILE
| O_NOATIME
);
531 ret
= __pcap_io
->pull_fhdr_pcap(fd
, &ctx
->magic
, &ctx
->link_type
);
533 panic("Error reading pcap header!\n");
535 if (__pcap_io
->prepare_access_pcap
) {
536 ret
= __pcap_io
->prepare_access_pcap(fd
, PCAP_MODE_RD
, ctx
->jumbo
);
538 panic("Error prepare reading pcap!\n");
541 fmemset(&fm
, 0, sizeof(fm
));
542 fmemset(&bpf_ops
, 0, sizeof(bpf_ops
));
544 bpf_parse_rules(ctx
->filter
, &bpf_ops
, ctx
->link_type
);
546 bpf_dump_all(&bpf_ops
);
548 dissector_init_all(ctx
->print_mode
);
550 out_len
= round_up(1024 * 1024, PAGE_SIZE
);
551 out
= xmalloc_aligned(out_len
, CO_CACHE_LINE_SIZE
);
553 if (ctx
->device_out
) {
554 if (!strncmp("-", ctx
->device_out
, strlen("-"))) {
555 fdo
= dup(fileno(stdout
));
556 close(fileno(stdout
));
558 fdo
= open_or_die_m(ctx
->device_out
, O_RDWR
| O_CREAT
|
559 O_TRUNC
| O_LARGEFILE
, DEFFILEMODE
);
563 drop_privileges(ctx
->enforce
, ctx
->uid
, ctx
->gid
);
565 printf("Running! Hang up with ^C!\n\n");
568 bug_on(gettimeofday(&start
, NULL
));
570 while (likely(sigint
== 0)) {
572 ret
= __pcap_io
->read_pcap(fd
, &phdr
, ctx
->magic
,
574 if (unlikely(ret
< 0))
577 if (unlikely(pcap_get_length(&phdr
, ctx
->magic
) == 0)) {
582 if (unlikely(pcap_get_length(&phdr
, ctx
->magic
) > out_len
)) {
583 pcap_set_length(&phdr
, ctx
->magic
, out_len
);
586 } while (ctx
->filter
&&
587 !bpf_run_filter(&bpf_ops
, out
,
588 pcap_get_length(&phdr
, ctx
->magic
)));
590 pcap_pkthdr_to_tpacket_hdr(&phdr
, ctx
->magic
, &fm
.tp_h
, &sll
);
592 ctx
->tx_bytes
+= fm
.tp_h
.tp_len
;
595 show_frame_hdr(&fm
, ctx
->print_mode
);
597 dissector_entry_point(out
, fm
.tp_h
.tp_snaplen
,
598 ctx
->link_type
, ctx
->print_mode
);
601 translate_pcap_to_txf(fdo
, out
, fm
.tp_h
.tp_snaplen
);
603 if (frame_count_max
!= 0) {
604 if (ctx
->tx_packets
>= frame_count_max
) {
613 bug_on(gettimeofday(&end
, NULL
));
614 timersub(&end
, &start
, &diff
);
616 bpf_release(&bpf_ops
);
618 dissector_cleanup_all();
620 if (__pcap_io
->prepare_close_pcap
)
621 __pcap_io
->prepare_close_pcap(fd
, PCAP_MODE_RD
);
627 printf("\r%12lu packets outgoing\n", ctx
->tx_packets
);
628 printf("\r%12lu packets truncated in file\n", trunced
);
629 printf("\r%12lu bytes outgoing\n", ctx
->tx_bytes
);
630 printf("\r%12lu sec, %lu usec in total\n", diff
.tv_sec
, diff
.tv_usec
);
632 if (!strncmp("-", ctx
->device_in
, strlen("-")))
633 dup2(fd
, fileno(stdin
));
636 if (ctx
->device_out
) {
637 if (!strncmp("-", ctx
->device_out
, strlen("-")))
638 dup2(fdo
, fileno(stdout
));
643 static void finish_multi_pcap_file(struct ctx
*ctx
, int fd
)
645 __pcap_io
->fsync_pcap(fd
);
647 if (__pcap_io
->prepare_close_pcap
)
648 __pcap_io
->prepare_close_pcap(fd
, PCAP_MODE_WR
);
652 fmemset(&itimer
, 0, sizeof(itimer
));
653 setitimer(ITIMER_REAL
, &itimer
, NULL
);
656 static int next_multi_pcap_file(struct ctx
*ctx
, int fd
)
661 __pcap_io
->fsync_pcap(fd
);
663 if (__pcap_io
->prepare_close_pcap
)
664 __pcap_io
->prepare_close_pcap(fd
, PCAP_MODE_WR
);
668 slprintf(fname
, sizeof(fname
), "%s/%s%lu.pcap", ctx
->device_out
,
669 ctx
->prefix
? : "dump-", time(0));
671 fd
= open_or_die_m(fname
, O_RDWR
| O_CREAT
| O_TRUNC
|
672 O_LARGEFILE
, DEFFILEMODE
);
674 ret
= __pcap_io
->push_fhdr_pcap(fd
, ctx
->magic
, ctx
->link_type
);
676 panic("Error writing pcap header!\n");
678 if (__pcap_io
->prepare_access_pcap
) {
679 ret
= __pcap_io
->prepare_access_pcap(fd
, PCAP_MODE_WR
, ctx
->jumbo
);
681 panic("Error prepare writing pcap!\n");
687 static int begin_multi_pcap_file(struct ctx
*ctx
)
694 if (ctx
->device_out
[strlen(ctx
->device_out
) - 1] == '/')
695 ctx
->device_out
[strlen(ctx
->device_out
) - 1] = 0;
697 slprintf(fname
, sizeof(fname
), "%s/%s%lu.pcap", ctx
->device_out
,
698 ctx
->prefix
? : "dump-", time(0));
700 fd
= open_or_die_m(fname
, O_RDWR
| O_CREAT
| O_TRUNC
|
701 O_LARGEFILE
, DEFFILEMODE
);
703 ret
= __pcap_io
->push_fhdr_pcap(fd
, ctx
->magic
, ctx
->link_type
);
705 panic("Error writing pcap header!\n");
707 if (__pcap_io
->prepare_access_pcap
) {
708 ret
= __pcap_io
->prepare_access_pcap(fd
, PCAP_MODE_WR
, ctx
->jumbo
);
710 panic("Error prepare writing pcap!\n");
713 if (ctx
->dump_mode
== DUMP_INTERVAL_TIME
) {
714 interval
= ctx
->dump_interval
;
716 set_itimer_interval_value(&itimer
, interval
, 0);
717 setitimer(ITIMER_REAL
, &itimer
, NULL
);
725 static void finish_single_pcap_file(struct ctx
*ctx
, int fd
)
727 __pcap_io
->fsync_pcap(fd
);
729 if (__pcap_io
->prepare_close_pcap
)
730 __pcap_io
->prepare_close_pcap(fd
, PCAP_MODE_WR
);
732 if (strncmp("-", ctx
->device_out
, strlen("-")))
735 dup2(fd
, fileno(stdout
));
738 static int begin_single_pcap_file(struct ctx
*ctx
)
744 if (!strncmp("-", ctx
->device_out
, strlen("-"))) {
745 fd
= dup(fileno(stdout
));
746 close(fileno(stdout
));
747 if (ctx
->pcap
== PCAP_OPS_MM
)
748 ctx
->pcap
= PCAP_OPS_SG
;
750 fd
= open_or_die_m(ctx
->device_out
,
751 O_RDWR
| O_CREAT
| O_TRUNC
|
752 O_LARGEFILE
, DEFFILEMODE
);
755 ret
= __pcap_io
->push_fhdr_pcap(fd
, ctx
->magic
, ctx
->link_type
);
757 panic("Error writing pcap header!\n");
759 if (__pcap_io
->prepare_access_pcap
) {
760 ret
= __pcap_io
->prepare_access_pcap(fd
, PCAP_MODE_WR
, ctx
->jumbo
);
762 panic("Error prepare writing pcap!\n");
768 static void print_pcap_file_stats(int sock
, struct ctx
*ctx
, unsigned long skipped
)
771 unsigned long good
, bad
;
772 struct tpacket_stats kstats
;
773 socklen_t slen
= sizeof(kstats
);
775 fmemset(&kstats
, 0, sizeof(kstats
));
777 ret
= getsockopt(sock
, SOL_PACKET
, PACKET_STATISTICS
, &kstats
, &slen
);
779 panic("Cannot get packet statistics!\n");
781 if (ctx
->print_mode
== PRINT_NONE
) {
782 good
= kstats
.tp_packets
- kstats
.tp_drops
- skipped
;
783 bad
= kstats
.tp_drops
+ skipped
;
785 printf(".(+%lu/-%lu)", good
, bad
);
790 static void recv_only_or_dump(struct ctx
*ctx
)
794 int sock
, irq
, ifindex
, fd
= 0, ret
;
795 unsigned int size
, it
= 0;
796 unsigned long frame_count
= 0, skipped
= 0;
798 struct pollfd rx_poll
;
799 struct frame_map
*hdr
;
800 struct sock_fprog bpf_ops
;
801 struct timeval start
, end
, diff
;
804 if (!device_up_and_running(ctx
->device_in
) && !ctx
->rfraw
)
805 panic("Device not up and running!\n");
810 ctx
->device_trans
= xstrdup(ctx
->device_in
);
811 xfree(ctx
->device_in
);
813 enter_rfmon_mac80211(ctx
->device_trans
, &ctx
->device_in
);
814 ctx
->link_type
= LINKTYPE_IEEE802_11
;
817 fmemset(&rx_ring
, 0, sizeof(rx_ring
));
818 fmemset(&rx_poll
, 0, sizeof(rx_poll
));
819 fmemset(&bpf_ops
, 0, sizeof(bpf_ops
));
821 ifindex
= device_ifindex(ctx
->device_in
);
823 size
= ring_size(ctx
->device_in
, ctx
->reserve_size
);
825 enable_kernel_bpf_jit_compiler();
827 bpf_parse_rules(ctx
->filter
, &bpf_ops
, ctx
->link_type
);
829 bpf_dump_all(&bpf_ops
);
830 bpf_attach_to_sock(sock
, &bpf_ops
);
832 set_sockopt_hwtimestamp(sock
, ctx
->device_in
);
834 setup_rx_ring_layout(sock
, &rx_ring
, size
, ctx
->jumbo
);
835 create_rx_ring(sock
, &rx_ring
, ctx
->verbose
);
836 mmap_rx_ring(sock
, &rx_ring
);
837 alloc_rx_ring_frames(&rx_ring
);
838 bind_rx_ring(sock
, &rx_ring
, ifindex
);
840 prepare_polling(sock
, &rx_poll
);
841 dissector_init_all(ctx
->print_mode
);
843 if (ctx
->cpu
>= 0 && ifindex
> 0) {
844 irq
= device_irq_number(ctx
->device_in
);
845 device_bind_irq_to_cpu(irq
, ctx
->cpu
);
848 printf("IRQ: %s:%d > CPU%d\n",
849 ctx
->device_in
, irq
, ctx
->cpu
);
852 if (ctx
->promiscuous
)
853 ifflags
= enter_promiscuous_mode(ctx
->device_in
);
855 drop_privileges(ctx
->enforce
, ctx
->uid
, ctx
->gid
);
857 if (dump_to_pcap(ctx
)) {
861 fmemset(&stats
, 0, sizeof(stats
));
862 ret
= stat(ctx
->device_out
, &stats
);
868 ctx
->dump_dir
= S_ISDIR(stats
.st_mode
);
870 fd
= begin_multi_pcap_file(ctx
);
873 fd
= begin_single_pcap_file(ctx
);
877 printf("Running! Hang up with ^C!\n\n");
880 bug_on(gettimeofday(&start
, NULL
));
882 while (likely(sigint
== 0)) {
883 while (user_may_pull_from_rx(rx_ring
.frames
[it
].iov_base
)) {
886 hdr
= rx_ring
.frames
[it
].iov_base
;
887 packet
= ((uint8_t *) hdr
) + hdr
->tp_h
.tp_mac
;
890 if (ctx
->packet_type
!= -1)
891 if (ctx
->packet_type
!= hdr
->s_ll
.sll_pkttype
)
894 if (unlikely(ring_frame_size(&rx_ring
) < hdr
->tp_h
.tp_snaplen
)) {
899 if (dump_to_pcap(ctx
)) {
900 tpacket_hdr_to_pcap_pkthdr(&hdr
->tp_h
, &hdr
->s_ll
, &phdr
, ctx
->magic
);
902 ret
= __pcap_io
->write_pcap(fd
, &phdr
, ctx
->magic
, packet
,
903 pcap_get_length(&phdr
, ctx
->magic
));
904 if (unlikely(ret
!= pcap_get_total_length(&phdr
, ctx
->magic
)))
905 panic("Write error to pcap!\n");
908 show_frame_hdr(hdr
, ctx
->print_mode
);
910 dissector_entry_point(packet
, hdr
->tp_h
.tp_snaplen
,
911 ctx
->link_type
, ctx
->print_mode
);
913 if (frame_count_max
!= 0) {
914 if (frame_count
>= frame_count_max
) {
922 kernel_may_pull_from_rx(&hdr
->tp_h
);
925 if (it
>= rx_ring
.layout
.tp_frame_nr
)
928 if (unlikely(sigint
== 1))
931 if (dump_to_pcap(ctx
)) {
932 if (ctx
->dump_mode
== DUMP_INTERVAL_SIZE
) {
933 interval
+= hdr
->tp_h
.tp_snaplen
;
935 if (interval
> ctx
->dump_interval
) {
942 fd
= next_multi_pcap_file(ctx
, fd
);
946 print_pcap_file_stats(sock
, ctx
, skipped
);
951 poll(&rx_poll
, 1, -1);
954 bug_on(gettimeofday(&end
, NULL
));
955 timersub(&end
, &start
, &diff
);
957 if (!(ctx
->dump_dir
&& ctx
->print_mode
== PRINT_NONE
)) {
958 sock_print_net_stats(sock
, skipped
);
960 printf("\r%12lu sec, %lu usec in total\n",
961 diff
.tv_sec
, diff
.tv_usec
);
967 bpf_release(&bpf_ops
);
968 dissector_cleanup_all();
969 destroy_rx_ring(sock
, &rx_ring
);
971 if (ctx
->promiscuous
)
972 leave_promiscuous_mode(ctx
->device_in
, ifflags
);
975 leave_rfmon_mac80211(ctx
->device_trans
, ctx
->device_in
);
977 if (dump_to_pcap(ctx
)) {
979 finish_multi_pcap_file(ctx
, fd
);
981 finish_single_pcap_file(ctx
, fd
);
987 static void help(void)
989 printf("\nnetsniff-ng %s, the packet sniffing beast\n", VERSION_STRING
);
990 puts("http://www.netsniff-ng.org\n\n"
991 "Usage: netsniff-ng [options] [filter-expression]\n"
993 " -i|-d|--dev|--in <dev|pcap|-> Input source as netdev, pcap or pcap stdin\n"
994 " -o|--out <dev|pcap|dir|cfg|-> Output sink as netdev, pcap, directory, trafgen, or stdout\n"
995 " -f|--filter <bpf-file|expr> Use BPF filter file from bpfc or tcpdump-like expression\n"
996 " -t|--type <type> Filter for: host|broadcast|multicast|others|outgoing\n"
997 " -F|--interval <size|time> Dump interval if -o is a dir: <num>KiB/MiB/GiB/s/sec/min/hrs\n"
998 " -J|--jumbo-support Support for 64KB Super Jumbo Frames (def: 2048B)\n"
999 " -R|--rfraw Capture or inject raw 802.11 frames\n"
1000 " -n|--num <0|uint> Number of packets until exit (def: 0)\n"
1001 " -P|--prefix <name> Prefix for pcaps stored in directory\n"
1002 " -T|--magic <pcap-magic> Pcap magic number/pcap format to store, see -D\n"
1003 " -D|--dump-pcap-types Dump pcap types and magic numbers and quit\n"
1004 " -B|--dump-bpf Dump generated BPF assembly\n"
1005 " -r|--rand Randomize packet forwarding order (dev->dev)\n"
1006 " -M|--no-promisc No promiscuous mode for netdev\n"
1007 " -A|--no-sock-mem Don't tune core socket memory\n"
1008 " -m|--mmap Mmap(2) pcap file i.e., for replaying pcaps\n"
1009 " -G|--sg Scatter/gather pcap file I/O\n"
1010 " -c|--clrw Use slower read(2)/write(2) I/O\n"
1011 " -S|--ring-size <size> Specify ring size to: <num>KiB/MiB/GiB\n"
1012 " -k|--kernel-pull <uint> Kernel pull from user interval in us (def: 10us)\n"
1013 " -b|--bind-cpu <cpu> Bind to specific CPU\n"
1014 " -u|--user <userid> Drop privileges and change to userid\n"
1015 " -g|--group <groupid> Drop privileges and change to groupid\n"
1016 " -H|--prio-high Make this high priority process\n"
1017 " -Q|--notouch-irq Do not touch IRQ CPU affinity of NIC\n"
1018 " -s|--silent Do not print captured packets\n"
1019 " -q|--less Print less-verbose packet information\n"
1020 " -X|--hex Print packet data in hex format\n"
1021 " -l|--ascii Print human-readable packet data\n"
1022 " -U|--update Update GeoIP databases\n"
1023 " -V|--verbose Be more verbose\n"
1024 " -v|--version Show version\n"
1025 " -h|--help Guess what?!\n\n"
1027 " netsniff-ng --in eth0 --out dump.pcap -s -T 0xa1b2c3d4 --b 0 tcp or udp\n"
1028 " netsniff-ng --in wlan0 --rfraw --out dump.pcap --silent --bind-cpu 0\n"
1029 " netsniff-ng --in dump.pcap --mmap --out eth0 -k1000 --silent --bind-cpu 0\n"
1030 " netsniff-ng --in dump.pcap --out dump.cfg --silent --bind-cpu 0\n"
1031 " netsniff-ng --in eth0 --out eth1 --silent --bind-cpu 0 --type host\n"
1032 " netsniff-ng --in eth1 --out /opt/probe/ -s -m -J --interval 100MiB -b 0\n"
1033 " netsniff-ng --in vlan0 --out dump.pcap -c -u `id -u bob` -g `id -g bob`\n"
1034 " netsniff-ng --in any --filter http.bpf --jumbo-support --ascii -V\n\n"
1036 " For introducing bit errors, delays with random variation and more\n"
1037 " while replaying pcaps, make use of tc(8) with its disciplines (e.g. netem).\n\n"
1038 "Please report bugs to <bugs@netsniff-ng.org>\n"
1039 "Copyright (C) 2009-2013 Daniel Borkmann <dborkma@tik.ee.ethz.ch>\n"
1040 "Copyright (C) 2009-2012 Emmanuel Roullit <emmanuel.roullit@gmail.com>\n"
1041 "Copyright (C) 2012 Markus Amend <markus@netsniff-ng.org>\n"
1042 "Swiss federal institute of technology (ETH Zurich)\n"
1043 "License: GNU GPL version 2.0\n"
1044 "This is free software: you are free to change and redistribute it.\n"
1045 "There is NO WARRANTY, to the extent permitted by law.\n");
1049 static void version(void)
1051 printf("\nnetsniff-ng %s, the packet sniffing beast\n", VERSION_STRING
);
1052 puts("http://www.netsniff-ng.org\n\n"
1053 "Please report bugs to <bugs@netsniff-ng.org>\n"
1054 "Copyright (C) 2009-2013 Daniel Borkmann <dborkma@tik.ee.ethz.ch>\n"
1055 "Copyright (C) 2009-2012 Emmanuel Roullit <emmanuel.roullit@gmail.com>\n"
1056 "Copyright (C) 2012 Markus Amend <markus@netsniff-ng.org>\n"
1057 "Swiss federal institute of technology (ETH Zurich)\n"
1058 "License: GNU GPL version 2.0\n"
1059 "This is free software: you are free to change and redistribute it.\n"
1060 "There is NO WARRANTY, to the extent permitted by law.\n");
1064 int main(int argc
, char **argv
)
1067 int c
, i
, j
, cpu_tmp
, opt_index
, ops_touched
= 0, vals
[4] = {0};
1068 bool prio_high
= false, setsockmem
= true;
1069 void (*main_loop
)(struct ctx
*ctx
) = NULL
;
1071 .link_type
= LINKTYPE_EN10MB
,
1072 .print_mode
= PRINT_NORM
,
1075 .promiscuous
= true,
1077 .pcap
= PCAP_OPS_SG
,
1078 .dump_interval
= 60,
1079 .dump_mode
= DUMP_INTERVAL_TIME
,
1082 .magic
= ORIGINAL_TCPDUMP_MAGIC
,
1087 while ((c
= getopt_long(argc
, argv
, short_options
, long_options
,
1088 &opt_index
)) != EOF
) {
1092 ctx
.device_in
= xstrdup(optarg
);
1095 ctx
.device_out
= xstrdup(optarg
);
1098 ctx
.prefix
= xstrdup(optarg
);
1101 ctx
.link_type
= LINKTYPE_IEEE802_11
;
1105 ctx
.randomize
= true;
1111 ctx
.magic
= (uint32_t) strtoul(optarg
, NULL
, 0);
1112 pcap_check_magic(ctx
.magic
);
1115 ctx
.filter
= xstrdup(optarg
);
1118 ctx
.promiscuous
= false;
1124 ctx
.uid
= strtoul(optarg
, NULL
, 0);
1128 ctx
.gid
= strtoul(optarg
, NULL
, 0);
1132 if (!strncmp(optarg
, "host", strlen("host")))
1133 ctx
.packet_type
= PACKET_HOST
;
1134 else if (!strncmp(optarg
, "broadcast", strlen("broadcast")))
1135 ctx
.packet_type
= PACKET_BROADCAST
;
1136 else if (!strncmp(optarg
, "multicast", strlen("multicast")))
1137 ctx
.packet_type
= PACKET_MULTICAST
;
1138 else if (!strncmp(optarg
, "others", strlen("others")))
1139 ctx
.packet_type
= PACKET_OTHERHOST
;
1140 else if (!strncmp(optarg
, "outgoing", strlen("outgoing")))
1141 ctx
.packet_type
= PACKET_OUTGOING
;
1143 ctx
.packet_type
= -1;
1147 ctx
.reserve_size
= 0;
1149 for (j
= i
= strlen(optarg
); i
> 0; --i
) {
1150 if (!isdigit(optarg
[j
- i
]))
1155 if (!strncmp(ptr
, "KiB", strlen("KiB")))
1156 ctx
.reserve_size
= 1 << 10;
1157 else if (!strncmp(ptr
, "MiB", strlen("MiB")))
1158 ctx
.reserve_size
= 1 << 20;
1159 else if (!strncmp(ptr
, "GiB", strlen("GiB")))
1160 ctx
.reserve_size
= 1 << 30;
1162 panic("Syntax error in ring size param!\n");
1165 ctx
.reserve_size
*= strtol(optarg
, NULL
, 0);
1168 cpu_tmp
= strtol(optarg
, NULL
, 0);
1170 cpu_affinity(cpu_tmp
);
1178 ctx
.pcap
= PCAP_OPS_RW
;
1182 ctx
.pcap
= PCAP_OPS_MM
;
1186 ctx
.pcap
= PCAP_OPS_SG
;
1193 ctx
.print_mode
= PRINT_NONE
;
1196 ctx
.print_mode
= PRINT_LESS
;
1200 (ctx
.print_mode
== PRINT_ASCII
) ?
1201 PRINT_HEX_ASCII
: PRINT_HEX
;
1205 (ctx
.print_mode
== PRINT_HEX
) ?
1206 PRINT_HEX_ASCII
: PRINT_ASCII
;
1209 ctx
.kpull
= strtol(optarg
, NULL
, 0);
1212 frame_count_max
= strtol(optarg
, NULL
, 0);
1216 ctx
.dump_interval
= 0;
1218 for (j
= i
= strlen(optarg
); i
> 0; --i
) {
1219 if (!isdigit(optarg
[j
- i
]))
1224 if (!strncmp(ptr
, "KiB", strlen("KiB"))) {
1225 ctx
.dump_interval
= 1 << 10;
1226 ctx
.dump_mode
= DUMP_INTERVAL_SIZE
;
1227 } else if (!strncmp(ptr
, "MiB", strlen("MiB"))) {
1228 ctx
.dump_interval
= 1 << 20;
1229 ctx
.dump_mode
= DUMP_INTERVAL_SIZE
;
1230 } else if (!strncmp(ptr
, "GiB", strlen("GiB"))) {
1231 ctx
.dump_interval
= 1 << 30;
1232 ctx
.dump_mode
= DUMP_INTERVAL_SIZE
;
1233 } else if (!strncmp(ptr
, "sec", strlen("sec"))) {
1234 ctx
.dump_interval
= 1;
1235 ctx
.dump_mode
= DUMP_INTERVAL_TIME
;
1236 } else if (!strncmp(ptr
, "min", strlen("min"))) {
1237 ctx
.dump_interval
= 60;
1238 ctx
.dump_mode
= DUMP_INTERVAL_TIME
;
1239 } else if (!strncmp(ptr
, "hrs", strlen("hrs"))) {
1240 ctx
.dump_interval
= 60 * 60;
1241 ctx
.dump_mode
= DUMP_INTERVAL_TIME
;
1242 } else if (!strncmp(ptr
, "s", strlen("s"))) {
1243 ctx
.dump_interval
= 1;
1244 ctx
.dump_mode
= DUMP_INTERVAL_TIME
;
1246 panic("Syntax error in time/size param!\n");
1250 ctx
.dump_interval
*= strtol(optarg
, NULL
, 0);
1256 ctx
.dump_bpf
= true;
1259 pcap_dump_type_features();
1289 panic("Option -%c requires an argument!\n",
1292 if (isprint(optopt
))
1293 printf("Unknown option character `0x%X\'!\n", optopt
);
1301 if (!ctx
.filter
&& optind
!= argc
) {
1305 for (i
= optind
; i
< argc
; ++i
) {
1306 size_t alen
= strlen(argv
[i
]) + 2;
1307 size_t flen
= ctx
.filter
? strlen(ctx
.filter
) : 0;
1309 ctx
.filter
= xrealloc(ctx
.filter
, 1, flen
+ alen
);
1310 ret
= slprintf(ctx
.filter
+ offset
, strlen(argv
[i
]) + 2, "%s ", argv
[i
]);
1312 panic("Cannot concatenate filter string!\n");
1319 ctx
.device_in
= xstrdup("any");
1321 register_signal(SIGINT
, signal_handler
);
1322 register_signal(SIGHUP
, signal_handler
);
1327 set_proc_prio(get_default_proc_prio());
1328 set_sched_status(get_default_sched_policy(), get_default_sched_prio());
1331 if (ctx
.device_in
&& (device_mtu(ctx
.device_in
) ||
1332 !strncmp("any", ctx
.device_in
, strlen(ctx
.device_in
)))) {
1333 if (!ctx
.device_out
) {
1335 main_loop
= recv_only_or_dump
;
1336 } else if (device_mtu(ctx
.device_out
)) {
1337 register_signal_f(SIGALRM
, timer_elapsed
, SA_SIGINFO
);
1338 main_loop
= receive_to_xmit
;
1341 register_signal_f(SIGALRM
, timer_next_dump
, SA_SIGINFO
);
1342 main_loop
= recv_only_or_dump
;
1344 ctx
.pcap
= PCAP_OPS_SG
;
1347 if (ctx
.device_out
&& device_mtu(ctx
.device_out
)) {
1348 register_signal_f(SIGALRM
, timer_elapsed
, SA_SIGINFO
);
1349 main_loop
= pcap_to_xmit
;
1351 ctx
.pcap
= PCAP_OPS_MM
;
1353 main_loop
= read_pcap
;
1355 ctx
.pcap
= PCAP_OPS_SG
;
1363 set_system_socket_memory(vals
, array_size(vals
));
1370 reset_system_socket_memory(vals
, array_size(vals
));
1375 free(ctx
.device_in
);
1376 free(ctx
.device_out
);
1377 free(ctx
.device_trans
);