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>
46 #include "tstamping.h"
47 #include "dissector.h"
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
;
60 bool randomize
, promiscuous
, enforce
, jumbo
, dump_bpf
, verbose
;
61 enum pcap_ops_groups pcap
; enum dump_mode dump_mode
;
62 uid_t uid
; gid_t gid
; uint32_t link_type
, magic
;
65 static volatile sig_atomic_t sigint
= 0;
66 static volatile bool next_dump
= false;
68 static const char *short_options
= "d:i:o:rf:MJt:S:k:n:b:HQmcsqXlvhF:RGAP:Vu:g:T:DBU";
69 static const struct option long_options
[] = {
70 {"dev", required_argument
, NULL
, 'd'},
71 {"in", required_argument
, NULL
, 'i'},
72 {"out", required_argument
, NULL
, 'o'},
73 {"filter", required_argument
, NULL
, 'f'},
74 {"num", required_argument
, NULL
, 'n'},
75 {"type", required_argument
, NULL
, 't'},
76 {"interval", required_argument
, NULL
, 'F'},
77 {"ring-size", required_argument
, NULL
, 'S'},
78 {"kernel-pull", required_argument
, NULL
, 'k'},
79 {"bind-cpu", required_argument
, NULL
, 'b'},
80 {"prefix", required_argument
, NULL
, 'P'},
81 {"user", required_argument
, NULL
, 'u'},
82 {"group", required_argument
, NULL
, 'g'},
83 {"magic", required_argument
, NULL
, 'T'},
84 {"rand", no_argument
, NULL
, 'r'},
85 {"rfraw", no_argument
, NULL
, 'R'},
86 {"mmap", no_argument
, NULL
, 'm'},
87 {"sg", no_argument
, NULL
, 'G'},
88 {"clrw", no_argument
, NULL
, 'c'},
89 {"jumbo-support", no_argument
, NULL
, 'J'},
90 {"no-promisc", no_argument
, NULL
, 'M'},
91 {"prio-high", no_argument
, NULL
, 'H'},
92 {"notouch-irq", no_argument
, NULL
, 'Q'},
93 {"dump-pcap-types", no_argument
, NULL
, 'D'},
94 {"dump-bpf", no_argument
, NULL
, 'B'},
95 {"silent", no_argument
, NULL
, 's'},
96 {"less", no_argument
, NULL
, 'q'},
97 {"hex", no_argument
, NULL
, 'X'},
98 {"ascii", no_argument
, NULL
, 'l'},
99 {"no-sock-mem", no_argument
, NULL
, 'A'},
100 {"update", no_argument
, NULL
, 'U'},
101 {"verbose", no_argument
, NULL
, 'V'},
102 {"version", no_argument
, NULL
, 'v'},
103 {"help", no_argument
, NULL
, 'h'},
108 static struct itimerval itimer
;
109 static unsigned long frame_count_max
= 0, interval
= TX_KERNEL_PULL_INT
;
111 #define __pcap_io pcap_ops[ctx->pcap]
113 static void signal_handler(int number
)
126 static void timer_elapsed(int unused __maybe_unused
)
130 set_itimer_interval_value(&itimer
, 0, interval
);
132 ret
= pull_and_flush_tx_ring(tx_sock
);
133 if (unlikely(ret
< 0)) {
134 /* We could hit EBADF if the socket has been closed before
135 * the timer was triggered.
137 if (errno
!= EBADF
&& errno
!= ENOBUFS
)
138 panic("Flushing TX_RING failed: %s!\n", strerror(errno
));
141 setitimer(ITIMER_REAL
, &itimer
, NULL
);
144 static void timer_purge(void)
148 ret
= pull_and_flush_tx_ring_wait(tx_sock
);
149 if (unlikely(ret
< 0)) {
150 if (errno
!= EBADF
&& errno
!= ENOBUFS
)
151 panic("Flushing TX_RING failed: %s!\n", strerror(errno
));
154 set_itimer_interval_value(&itimer
, 0, 0);
155 setitimer(ITIMER_REAL
, &itimer
, NULL
);
158 static void timer_next_dump(int unused __maybe_unused
)
160 set_itimer_interval_value(&itimer
, interval
, 0);
162 setitimer(ITIMER_REAL
, &itimer
, NULL
);
165 static inline bool dump_to_pcap(struct ctx
*ctx
)
170 static void pcap_to_xmit(struct ctx
*ctx
)
173 int ifindex
, fd
= 0, ret
;
176 unsigned long trunced
= 0;
178 struct frame_map
*hdr
;
179 struct sock_fprog bpf_ops
;
180 struct timeval start
, end
, diff
;
183 if (!device_up_and_running(ctx
->device_out
) && !ctx
->rfraw
)
184 panic("Device not up and running!\n");
188 tx_sock
= pf_socket();
190 if (!strncmp("-", ctx
->device_in
, strlen("-"))) {
191 fd
= dup_or_die(fileno(stdin
));
192 close(fileno(stdin
));
193 if (ctx
->pcap
== PCAP_OPS_MM
)
194 ctx
->pcap
= PCAP_OPS_SG
;
196 fd
= open_or_die(ctx
->device_in
, O_RDONLY
| O_LARGEFILE
| O_NOATIME
);
199 if (__pcap_io
->init_once_pcap
)
200 __pcap_io
->init_once_pcap();
202 ret
= __pcap_io
->pull_fhdr_pcap(fd
, &ctx
->magic
, &ctx
->link_type
);
204 panic("Error reading pcap header!\n");
206 if (__pcap_io
->prepare_access_pcap
) {
207 ret
= __pcap_io
->prepare_access_pcap(fd
, PCAP_MODE_RD
, ctx
->jumbo
);
209 panic("Error prepare reading pcap!\n");
213 ctx
->device_trans
= xstrdup(ctx
->device_out
);
214 xfree(ctx
->device_out
);
216 enter_rfmon_mac80211(ctx
->device_trans
, &ctx
->device_out
);
217 if (ctx
->link_type
!= LINKTYPE_IEEE802_11
)
218 panic("Wrong linktype of pcap!\n");
221 ifindex
= device_ifindex(ctx
->device_out
);
222 size
= ring_size(ctx
->device_out
, ctx
->reserve_size
);
224 bpf_parse_rules(ctx
->filter
, &bpf_ops
, ctx
->link_type
);
226 bpf_dump_all(&bpf_ops
);
228 ring_tx_setup(&tx_ring
, tx_sock
, size
, ifindex
, ctx
->jumbo
, ctx
->verbose
);
230 dissector_init_all(ctx
->print_mode
);
232 if (ctx
->cpu
>= 0 && ifindex
> 0) {
233 int irq
= device_irq_number(ctx
->device_out
);
234 device_set_irq_affinity(irq
, ctx
->cpu
);
237 printf("IRQ: %s:%d > CPU%d\n",
238 ctx
->device_out
, irq
, ctx
->cpu
);
242 interval
= ctx
->kpull
;
244 set_itimer_interval_value(&itimer
, 0, interval
);
245 setitimer(ITIMER_REAL
, &itimer
, NULL
);
247 drop_privileges(ctx
->enforce
, ctx
->uid
, ctx
->gid
);
249 printf("Running! Hang up with ^C!\n\n");
252 bug_on(gettimeofday(&start
, NULL
));
254 while (likely(sigint
== 0)) {
255 while (user_may_pull_from_tx(tx_ring
.frames
[it
].iov_base
)) {
256 hdr
= tx_ring
.frames
[it
].iov_base
;
257 out
= ((uint8_t *) hdr
) + TPACKET2_HDRLEN
- sizeof(struct sockaddr_ll
);
260 ret
= __pcap_io
->read_pcap(fd
, &phdr
, ctx
->magic
, out
,
261 ring_frame_size(&tx_ring
));
262 if (unlikely(ret
<= 0))
265 if (ring_frame_size(&tx_ring
) <
266 pcap_get_length(&phdr
, ctx
->magic
)) {
267 pcap_set_length(&phdr
, ctx
->magic
,
268 ring_frame_size(&tx_ring
));
271 } while (ctx
->filter
&&
272 !bpf_run_filter(&bpf_ops
, out
,
273 pcap_get_length(&phdr
, ctx
->magic
)));
275 pcap_pkthdr_to_tpacket_hdr(&phdr
, ctx
->magic
, &hdr
->tp_h
, NULL
);
277 ctx
->tx_bytes
+= hdr
->tp_h
.tp_len
;;
280 show_frame_hdr(out
, hdr
->tp_h
.tp_snaplen
,
281 ctx
->link_type
, hdr
, ctx
->print_mode
);
283 dissector_entry_point(out
, hdr
->tp_h
.tp_snaplen
,
284 ctx
->link_type
, ctx
->print_mode
);
286 kernel_may_pull_from_tx(&hdr
->tp_h
);
289 if (it
>= tx_ring
.layout
.tp_frame_nr
)
292 if (unlikely(sigint
== 1))
295 if (frame_count_max
!= 0) {
296 if (ctx
->tx_packets
>= frame_count_max
) {
305 bug_on(gettimeofday(&end
, NULL
));
306 timersub(&end
, &start
, &diff
);
310 bpf_release(&bpf_ops
);
312 dissector_cleanup_all();
313 destroy_tx_ring(tx_sock
, &tx_ring
);
316 leave_rfmon_mac80211(ctx
->device_out
);
318 if (__pcap_io
->prepare_close_pcap
)
319 __pcap_io
->prepare_close_pcap(fd
, PCAP_MODE_RD
);
321 if (!strncmp("-", ctx
->device_in
, strlen("-")))
322 dup2(fd
, fileno(stdin
));
329 printf("\r%12lu packets outgoing\n", ctx
->tx_packets
);
330 printf("\r%12lu packets truncated in file\n", trunced
);
331 printf("\r%12lu bytes outgoing\n", ctx
->tx_bytes
);
332 printf("\r%12lu sec, %lu usec in total\n", diff
.tv_sec
, diff
.tv_usec
);
335 static void receive_to_xmit(struct ctx
*ctx
)
339 int rx_sock
, ifindex_in
, ifindex_out
, ret
;
340 size_t size_in
, size_out
;
341 unsigned int it_in
= 0, it_out
= 0;
342 unsigned long frame_count
= 0;
343 struct frame_map
*hdr_in
, *hdr_out
;
344 struct ring tx_ring
, rx_ring
;
345 struct pollfd rx_poll
;
346 struct sock_fprog bpf_ops
;
348 if (!strncmp(ctx
->device_in
, ctx
->device_out
, IFNAMSIZ
))
349 panic("Ingress/egress devices must be different!\n");
350 if (!device_up_and_running(ctx
->device_out
))
351 panic("Egress device not up and running!\n");
353 rx_sock
= pf_socket();
354 tx_sock
= pf_socket();
356 ifindex_in
= device_ifindex(ctx
->device_in
);
357 ifindex_out
= device_ifindex(ctx
->device_out
);
359 size_in
= ring_size(ctx
->device_in
, ctx
->reserve_size
);
360 size_out
= ring_size(ctx
->device_out
, ctx
->reserve_size
);
362 enable_kernel_bpf_jit_compiler();
364 bpf_parse_rules(ctx
->filter
, &bpf_ops
, ctx
->link_type
);
366 bpf_dump_all(&bpf_ops
);
367 bpf_attach_to_sock(rx_sock
, &bpf_ops
);
369 ring_rx_setup(&rx_ring
, rx_sock
, size_in
, ifindex_in
, &rx_poll
, false, ctx
->jumbo
, ctx
->verbose
);
370 ring_tx_setup(&tx_ring
, tx_sock
, size_out
, ifindex_out
, ctx
->jumbo
, ctx
->verbose
);
372 dissector_init_all(ctx
->print_mode
);
374 if (ctx
->promiscuous
)
375 ifflags
= device_enter_promiscuous_mode(ctx
->device_in
);
378 interval
= ctx
->kpull
;
380 set_itimer_interval_value(&itimer
, 0, interval
);
381 setitimer(ITIMER_REAL
, &itimer
, NULL
);
383 drop_privileges(ctx
->enforce
, ctx
->uid
, ctx
->gid
);
385 printf("Running! Hang up with ^C!\n\n");
388 while (likely(sigint
== 0)) {
389 while (user_may_pull_from_rx(rx_ring
.frames
[it_in
].iov_base
)) {
390 hdr_in
= rx_ring
.frames
[it_in
].iov_base
;
391 in
= ((uint8_t *) hdr_in
) + hdr_in
->tp_h
.tp_mac
;
395 if (ctx
->packet_type
!= -1)
396 if (ctx
->packet_type
!= hdr_in
->s_ll
.sll_pkttype
)
399 hdr_out
= tx_ring
.frames
[it_out
].iov_base
;
400 out
= ((uint8_t *) hdr_out
) + TPACKET2_HDRLEN
- sizeof(struct sockaddr_ll
);
402 while (!user_may_pull_from_tx(tx_ring
.frames
[it_out
].iov_base
) &&
405 next_rnd_slot(&it_out
, &tx_ring
);
408 if (it_out
>= tx_ring
.layout
.tp_frame_nr
)
412 hdr_out
= tx_ring
.frames
[it_out
].iov_base
;
413 out
= ((uint8_t *) hdr_out
) + TPACKET2_HDRLEN
- sizeof(struct sockaddr_ll
);
416 tpacket_hdr_clone(&hdr_out
->tp_h
, &hdr_in
->tp_h
);
417 fmemcpy(out
, in
, hdr_in
->tp_h
.tp_len
);
419 kernel_may_pull_from_tx(&hdr_out
->tp_h
);
421 next_rnd_slot(&it_out
, &tx_ring
);
424 if (it_out
>= tx_ring
.layout
.tp_frame_nr
)
428 show_frame_hdr(in
, hdr_in
->tp_h
.tp_snaplen
,
429 ctx
->link_type
, 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
) {
442 kernel_may_pull_from_rx(&hdr_in
->tp_h
);
445 if (it_in
>= rx_ring
.layout
.tp_frame_nr
)
448 if (unlikely(sigint
== 1))
452 ret
= poll(&rx_poll
, 1, -1);
453 if (unlikely(ret
< 0)) {
455 panic("Poll failed!\n");
462 sock_rx_net_stats(rx_sock
, 0);
464 bpf_release(&bpf_ops
);
466 dissector_cleanup_all();
468 destroy_tx_ring(tx_sock
, &tx_ring
);
469 destroy_rx_ring(rx_sock
, &rx_ring
);
471 if (ctx
->promiscuous
)
472 device_leave_promiscuous_mode(ctx
->device_in
, ifflags
);
478 static void translate_pcap_to_txf(int fdo
, uint8_t *out
, size_t len
)
480 size_t bytes_done
= 0;
483 slprintf(bout
, sizeof(bout
), "{\n ");
484 write_or_die(fdo
, bout
, strlen(bout
));
486 while (bytes_done
< len
) {
487 slprintf(bout
, sizeof(bout
), "0x%02x, ", out
[bytes_done
]);
488 write_or_die(fdo
, bout
, strlen(bout
));
492 if (bytes_done
% 10 == 0) {
493 slprintf(bout
, sizeof(bout
), "\n");
494 write_or_die(fdo
, bout
, strlen(bout
));
496 if (bytes_done
< len
) {
497 slprintf(bout
, sizeof(bout
), " ");
498 write_or_die(fdo
, bout
, strlen(bout
));
502 if (bytes_done
% 10 != 0) {
503 slprintf(bout
, sizeof(bout
), "\n");
504 write_or_die(fdo
, bout
, strlen(bout
));
507 slprintf(bout
, sizeof(bout
), "}\n\n");
508 write_or_die(fdo
, bout
, strlen(bout
));
511 static void read_pcap(struct ctx
*ctx
)
514 int ret
, fd
, fdo
= 0;
515 unsigned long trunced
= 0;
518 struct sock_fprog bpf_ops
;
520 struct timeval start
, end
, diff
;
524 if (!strncmp("-", ctx
->device_in
, strlen("-"))) {
525 fd
= dup_or_die(fileno(stdin
));
526 close(fileno(stdin
));
527 if (ctx
->pcap
== PCAP_OPS_MM
)
528 ctx
->pcap
= PCAP_OPS_SG
;
530 fd
= open_or_die(ctx
->device_in
, O_RDONLY
| O_LARGEFILE
| O_NOATIME
);
533 if (__pcap_io
->init_once_pcap
)
534 __pcap_io
->init_once_pcap();
536 ret
= __pcap_io
->pull_fhdr_pcap(fd
, &ctx
->magic
, &ctx
->link_type
);
538 panic("Error reading pcap header!\n");
540 if (__pcap_io
->prepare_access_pcap
) {
541 ret
= __pcap_io
->prepare_access_pcap(fd
, PCAP_MODE_RD
, ctx
->jumbo
);
543 panic("Error prepare reading pcap!\n");
546 fmemset(&fm
, 0, sizeof(fm
));
548 bpf_parse_rules(ctx
->filter
, &bpf_ops
, ctx
->link_type
);
550 bpf_dump_all(&bpf_ops
);
552 dissector_init_all(ctx
->print_mode
);
554 out_len
= round_up(1024 * 1024, RUNTIME_PAGE_SIZE
);
555 out
= xmalloc_aligned(out_len
, CO_CACHE_LINE_SIZE
);
557 if (ctx
->device_out
) {
558 if (!strncmp("-", ctx
->device_out
, strlen("-"))) {
559 fdo
= dup_or_die(fileno(stdout
));
560 close(fileno(stdout
));
562 fdo
= open_or_die_m(ctx
->device_out
, O_RDWR
| O_CREAT
|
563 O_TRUNC
| O_LARGEFILE
, DEFFILEMODE
);
567 drop_privileges(ctx
->enforce
, ctx
->uid
, ctx
->gid
);
569 printf("Running! Hang up with ^C!\n\n");
572 bug_on(gettimeofday(&start
, NULL
));
574 while (likely(sigint
== 0)) {
576 ret
= __pcap_io
->read_pcap(fd
, &phdr
, ctx
->magic
,
578 if (unlikely(ret
< 0))
581 if (unlikely(pcap_get_length(&phdr
, ctx
->magic
) == 0)) {
586 if (unlikely(pcap_get_length(&phdr
, ctx
->magic
) > out_len
)) {
587 pcap_set_length(&phdr
, ctx
->magic
, out_len
);
590 } while (ctx
->filter
&&
591 !bpf_run_filter(&bpf_ops
, out
,
592 pcap_get_length(&phdr
, ctx
->magic
)));
594 pcap_pkthdr_to_tpacket_hdr(&phdr
, ctx
->magic
, &fm
.tp_h
, &fm
.s_ll
);
596 ctx
->tx_bytes
+= fm
.tp_h
.tp_len
;
599 show_frame_hdr(out
, fm
.tp_h
.tp_snaplen
, ctx
->link_type
, &fm
,
602 dissector_entry_point(out
, fm
.tp_h
.tp_snaplen
,
603 ctx
->link_type
, ctx
->print_mode
);
606 translate_pcap_to_txf(fdo
, out
, fm
.tp_h
.tp_snaplen
);
608 if (frame_count_max
!= 0) {
609 if (ctx
->tx_packets
>= frame_count_max
) {
618 bug_on(gettimeofday(&end
, NULL
));
619 timersub(&end
, &start
, &diff
);
621 bpf_release(&bpf_ops
);
623 dissector_cleanup_all();
625 if (__pcap_io
->prepare_close_pcap
)
626 __pcap_io
->prepare_close_pcap(fd
, PCAP_MODE_RD
);
632 printf("\r%12lu packets outgoing\n", ctx
->tx_packets
);
633 printf("\r%12lu packets truncated in file\n", trunced
);
634 printf("\r%12lu bytes outgoing\n", ctx
->tx_bytes
);
635 printf("\r%12lu sec, %lu usec in total\n", diff
.tv_sec
, diff
.tv_usec
);
637 if (!strncmp("-", ctx
->device_in
, strlen("-")))
638 dup2(fd
, fileno(stdin
));
641 if (ctx
->device_out
) {
642 if (!strncmp("-", ctx
->device_out
, strlen("-")))
643 dup2(fdo
, fileno(stdout
));
648 static void finish_multi_pcap_file(struct ctx
*ctx
, int fd
)
650 __pcap_io
->fsync_pcap(fd
);
652 if (__pcap_io
->prepare_close_pcap
)
653 __pcap_io
->prepare_close_pcap(fd
, PCAP_MODE_WR
);
657 fmemset(&itimer
, 0, sizeof(itimer
));
658 setitimer(ITIMER_REAL
, &itimer
, NULL
);
661 static int next_multi_pcap_file(struct ctx
*ctx
, int fd
)
666 __pcap_io
->fsync_pcap(fd
);
668 if (__pcap_io
->prepare_close_pcap
)
669 __pcap_io
->prepare_close_pcap(fd
, PCAP_MODE_WR
);
673 slprintf(fname
, sizeof(fname
), "%s/%s%lu.pcap", ctx
->device_out
,
674 ctx
->prefix
? : "dump-", time(NULL
));
676 fd
= open_or_die_m(fname
, O_RDWR
| O_CREAT
| O_TRUNC
|
677 O_LARGEFILE
, DEFFILEMODE
);
679 ret
= __pcap_io
->push_fhdr_pcap(fd
, ctx
->magic
, ctx
->link_type
);
681 panic("Error writing pcap header!\n");
683 if (__pcap_io
->prepare_access_pcap
) {
684 ret
= __pcap_io
->prepare_access_pcap(fd
, PCAP_MODE_WR
, true);
686 panic("Error prepare writing pcap!\n");
692 static int begin_multi_pcap_file(struct ctx
*ctx
)
699 if (ctx
->device_out
[strlen(ctx
->device_out
) - 1] == '/')
700 ctx
->device_out
[strlen(ctx
->device_out
) - 1] = 0;
702 slprintf(fname
, sizeof(fname
), "%s/%s%lu.pcap", ctx
->device_out
,
703 ctx
->prefix
? : "dump-", time(NULL
));
705 fd
= open_or_die_m(fname
, O_RDWR
| O_CREAT
| O_TRUNC
|
706 O_LARGEFILE
, DEFFILEMODE
);
708 ret
= __pcap_io
->push_fhdr_pcap(fd
, ctx
->magic
, ctx
->link_type
);
710 panic("Error writing pcap header!\n");
712 if (__pcap_io
->prepare_access_pcap
) {
713 ret
= __pcap_io
->prepare_access_pcap(fd
, PCAP_MODE_WR
, true);
715 panic("Error prepare writing pcap!\n");
718 if (ctx
->dump_mode
== DUMP_INTERVAL_TIME
) {
719 interval
= ctx
->dump_interval
;
721 set_itimer_interval_value(&itimer
, interval
, 0);
722 setitimer(ITIMER_REAL
, &itimer
, NULL
);
730 static void finish_single_pcap_file(struct ctx
*ctx
, int fd
)
732 __pcap_io
->fsync_pcap(fd
);
734 if (__pcap_io
->prepare_close_pcap
)
735 __pcap_io
->prepare_close_pcap(fd
, PCAP_MODE_WR
);
737 if (strncmp("-", ctx
->device_out
, strlen("-")))
740 dup2(fd
, fileno(stdout
));
743 static int begin_single_pcap_file(struct ctx
*ctx
)
749 if (!strncmp("-", ctx
->device_out
, strlen("-"))) {
750 fd
= dup_or_die(fileno(stdout
));
751 close(fileno(stdout
));
752 if (ctx
->pcap
== PCAP_OPS_MM
)
753 ctx
->pcap
= PCAP_OPS_SG
;
755 fd
= open_or_die_m(ctx
->device_out
,
756 O_RDWR
| O_CREAT
| O_TRUNC
|
757 O_LARGEFILE
, DEFFILEMODE
);
760 ret
= __pcap_io
->push_fhdr_pcap(fd
, ctx
->magic
, ctx
->link_type
);
762 panic("Error writing pcap header!\n");
764 if (__pcap_io
->prepare_access_pcap
) {
765 ret
= __pcap_io
->prepare_access_pcap(fd
, PCAP_MODE_WR
, true);
767 panic("Error prepare writing pcap!\n");
773 static void print_pcap_file_stats(int sock
, struct ctx
*ctx
)
776 struct tpacket_stats kstats
;
777 socklen_t slen
= sizeof(kstats
);
779 fmemset(&kstats
, 0, sizeof(kstats
));
781 ret
= getsockopt(sock
, SOL_PACKET
, PACKET_STATISTICS
, &kstats
, &slen
);
783 panic("Cannot get packet statistics!\n");
785 if (ctx
->print_mode
== PRINT_NONE
) {
786 printf(".(+%u/-%u)", kstats
.tp_packets
- kstats
.tp_drops
,
792 static void walk_t3_block(struct block_desc
*pbd
, struct ctx
*ctx
,
793 int sock
, int *fd
, unsigned long *frame_count
)
795 int num_pkts
= pbd
->h1
.num_pkts
, i
;
796 struct tpacket3_hdr
*hdr
;
797 struct sockaddr_ll
*sll
;
799 hdr
= (void *) ((uint8_t *) pbd
+ pbd
->h1
.offset_to_first_pkt
);
800 sll
= (void *) ((uint8_t *) hdr
+ TPACKET_ALIGN(sizeof(*hdr
)));
802 for (i
= 0; i
< num_pkts
&& likely(sigint
== 0); ++i
) {
803 uint8_t *packet
= ((uint8_t *) hdr
+ hdr
->tp_mac
);
806 if (ctx
->packet_type
!= -1)
807 if (ctx
->packet_type
!= sll
->sll_pkttype
)
812 if (dump_to_pcap(ctx
)) {
815 tpacket3_hdr_to_pcap_pkthdr(hdr
, sll
, &phdr
, ctx
->magic
);
817 ret
= __pcap_io
->write_pcap(*fd
, &phdr
, ctx
->magic
, packet
,
818 pcap_get_length(&phdr
, ctx
->magic
));
819 if (unlikely(ret
!= (int) pcap_get_total_length(&phdr
, ctx
->magic
)))
820 panic("Write error to pcap!\n");
823 __show_frame_hdr(packet
, hdr
->tp_snaplen
, ctx
->link_type
, sll
,
824 hdr
, ctx
->print_mode
, true);
826 dissector_entry_point(packet
, hdr
->tp_snaplen
, ctx
->link_type
,
829 hdr
= (void *) ((uint8_t *) hdr
+ hdr
->tp_next_offset
);
830 sll
= (void *) ((uint8_t *) hdr
+ TPACKET_ALIGN(sizeof(*hdr
)));
832 if (frame_count_max
!= 0) {
833 if (unlikely(*frame_count
>= frame_count_max
)) {
839 if (dump_to_pcap(ctx
)) {
840 if (ctx
->dump_mode
== DUMP_INTERVAL_SIZE
) {
841 interval
+= hdr
->tp_snaplen
;
842 if (interval
> ctx
->dump_interval
) {
849 *fd
= next_multi_pcap_file(ctx
, *fd
);
852 if (unlikely(ctx
->verbose
))
853 print_pcap_file_stats(sock
, ctx
);
859 static void recv_only_or_dump(struct ctx
*ctx
)
862 int sock
, ifindex
, fd
= 0, ret
;
866 struct pollfd rx_poll
;
867 struct sock_fprog bpf_ops
;
868 struct timeval start
, end
, diff
;
869 struct block_desc
*pbd
;
870 unsigned long frame_count
= 0;
875 ctx
->device_trans
= xstrdup(ctx
->device_in
);
876 xfree(ctx
->device_in
);
878 enter_rfmon_mac80211(ctx
->device_trans
, &ctx
->device_in
);
879 ctx
->link_type
= LINKTYPE_IEEE802_11
;
882 ifindex
= device_ifindex(ctx
->device_in
);
884 size
= ring_size(ctx
->device_in
, ctx
->reserve_size
);
886 enable_kernel_bpf_jit_compiler();
888 bpf_parse_rules(ctx
->filter
, &bpf_ops
, ctx
->link_type
);
890 bpf_dump_all(&bpf_ops
);
891 bpf_attach_to_sock(sock
, &bpf_ops
);
893 ret
= set_sockopt_hwtimestamp(sock
, ctx
->device_in
);
894 if (ret
== 0 && ctx
->verbose
)
895 printf("HW timestamping enabled\n");
897 ring_rx_setup(&rx_ring
, sock
, size
, ifindex
, &rx_poll
, true, true, ctx
->verbose
);
899 dissector_init_all(ctx
->print_mode
);
901 if (ctx
->cpu
>= 0 && ifindex
> 0) {
902 int irq
= device_irq_number(ctx
->device_in
);
903 device_set_irq_affinity(irq
, ctx
->cpu
);
906 printf("IRQ: %s:%d > CPU%d\n",
907 ctx
->device_in
, irq
, ctx
->cpu
);
910 if (ctx
->promiscuous
)
911 ifflags
= device_enter_promiscuous_mode(ctx
->device_in
);
913 if (dump_to_pcap(ctx
) && __pcap_io
->init_once_pcap
)
914 __pcap_io
->init_once_pcap();
916 drop_privileges(ctx
->enforce
, ctx
->uid
, ctx
->gid
);
918 if (dump_to_pcap(ctx
)) {
921 ret
= stat(ctx
->device_out
, &stats
);
925 ctx
->dump_dir
= S_ISDIR(stats
.st_mode
);
928 fd
= begin_multi_pcap_file(ctx
);
930 fd
= begin_single_pcap_file(ctx
);
933 printf("Running! Hang up with ^C!\n\n");
936 bug_on(gettimeofday(&start
, NULL
));
938 while (likely(sigint
== 0)) {
939 while (user_may_pull_from_rx_block((pbd
= (void *)
940 rx_ring
.frames
[it
].iov_base
))) {
941 walk_t3_block(pbd
, ctx
, sock
, &fd
, &frame_count
);
943 kernel_may_pull_from_rx_block(pbd
);
944 it
= (it
+ 1) % rx_ring
.layout3
.tp_block_nr
;
946 if (unlikely(sigint
== 1))
950 ret
= poll(&rx_poll
, 1, -1);
951 if (unlikely(ret
< 0)) {
953 panic("Poll failed!\n");
957 bug_on(gettimeofday(&end
, NULL
));
958 timersub(&end
, &start
, &diff
);
960 if (!(ctx
->dump_dir
&& ctx
->print_mode
== PRINT_NONE
)) {
961 sock_rx_net_stats(sock
, frame_count
);
963 printf("\r%12lu sec, %lu usec in total\n",
964 diff
.tv_sec
, diff
.tv_usec
);
970 bpf_release(&bpf_ops
);
971 dissector_cleanup_all();
972 destroy_rx_ring(sock
, &rx_ring
);
974 if (ctx
->promiscuous
)
975 device_leave_promiscuous_mode(ctx
->device_in
, ifflags
);
978 leave_rfmon_mac80211(ctx
->device_in
);
980 if (dump_to_pcap(ctx
)) {
982 finish_multi_pcap_file(ctx
, fd
);
984 finish_single_pcap_file(ctx
, fd
);
990 static void init_ctx(struct ctx
*ctx
)
992 memset(ctx
, 0, sizeof(*ctx
));
997 ctx
->packet_type
= -1;
999 ctx
->magic
= ORIGINAL_TCPDUMP_MAGIC
;
1000 ctx
->print_mode
= PRINT_NORM
;
1001 ctx
->pcap
= PCAP_OPS_SG
;
1003 ctx
->dump_mode
= DUMP_INTERVAL_TIME
;
1004 ctx
->dump_interval
= 60;
1006 ctx
->promiscuous
= true;
1007 ctx
->randomize
= false;
1010 static void destroy_ctx(struct ctx
*ctx
)
1012 free(ctx
->device_in
);
1013 free(ctx
->device_out
);
1014 free(ctx
->device_trans
);
1019 static void __noreturn
help(void)
1021 printf("\nnetsniff-ng %s, the packet sniffing beast\n", VERSION_STRING
);
1022 puts("http://www.netsniff-ng.org\n\n"
1023 "Usage: netsniff-ng [options] [filter-expression]\n"
1025 " -i|-d|--dev|--in <dev|pcap|-> Input source as netdev, pcap or pcap stdin\n"
1026 " -o|--out <dev|pcap|dir|cfg|-> Output sink as netdev, pcap, directory, trafgen, or stdout\n"
1027 " -f|--filter <bpf-file|expr> Use BPF filter file from bpfc or tcpdump-like expression\n"
1028 " -t|--type <type> Filter for: host|broadcast|multicast|others|outgoing\n"
1029 " -F|--interval <size|time> Dump interval if -o is a dir: <num>KiB/MiB/GiB/s/sec/min/hrs\n"
1030 " -R|--rfraw Capture or inject raw 802.11 frames\n"
1031 " -n|--num <0|uint> Number of packets until exit (def: 0)\n"
1032 " -P|--prefix <name> Prefix for pcaps stored in directory\n"
1033 " -T|--magic <pcap-magic> Pcap magic number/pcap format to store, see -D\n"
1034 " -D|--dump-pcap-types Dump pcap types and magic numbers and quit\n"
1035 " -B|--dump-bpf Dump generated BPF assembly\n"
1036 " -r|--rand Randomize packet forwarding order (dev->dev)\n"
1037 " -M|--no-promisc No promiscuous mode for netdev\n"
1038 " -A|--no-sock-mem Don't tune core socket memory\n"
1039 " -m|--mmap Mmap(2) pcap file I/O, e.g. for replaying pcaps\n"
1040 " -G|--sg Scatter/gather pcap file I/O\n"
1041 " -c|--clrw Use slower read(2)/write(2) I/O\n"
1042 " -S|--ring-size <size> Specify ring size to: <num>KiB/MiB/GiB\n"
1043 " -k|--kernel-pull <uint> Kernel pull from user interval in us (def: 10us)\n"
1044 " -J|--jumbo-support Support replay/fwd 64KB Super Jumbo Frames (def: 2048B)\n"
1045 " -b|--bind-cpu <cpu> Bind to specific CPU\n"
1046 " -u|--user <userid> Drop privileges and change to userid\n"
1047 " -g|--group <groupid> Drop privileges and change to groupid\n"
1048 " -H|--prio-high Make this high priority process\n"
1049 " -Q|--notouch-irq Do not touch IRQ CPU affinity of NIC\n"
1050 " -s|--silent Do not print captured packets\n"
1051 " -q|--less Print less-verbose packet information\n"
1052 " -X|--hex Print packet data in hex format\n"
1053 " -l|--ascii Print human-readable packet data\n"
1054 " -U|--update Update GeoIP databases\n"
1055 " -V|--verbose Be more verbose\n"
1056 " -v|--version Show version and exit\n"
1057 " -h|--help Guess what?!\n\n"
1059 " netsniff-ng --in eth0 --out dump.pcap -s -T 0xa1b2c3d4 --b 0 tcp or udp\n"
1060 " netsniff-ng --in wlan0 --rfraw --out dump.pcap --silent --bind-cpu 0\n"
1061 " netsniff-ng --in dump.pcap --mmap --out eth0 -k1000 --silent --bind-cpu 0\n"
1062 " netsniff-ng --in dump.pcap --out dump.cfg --silent --bind-cpu 0\n"
1063 " netsniff-ng --in eth0 --out eth1 --silent --bind-cpu 0 -J --type host\n"
1064 " netsniff-ng --in eth1 --out /opt/probe/ -s -m --interval 100MiB -b 0\n"
1065 " netsniff-ng --in vlan0 --out dump.pcap -c -u `id -u bob` -g `id -g bob`\n"
1066 " netsniff-ng --in any --filter http.bpf --jumbo-support --ascii -V\n\n"
1068 " For introducing bit errors, delays with random variation and more\n"
1069 " while replaying pcaps, make use of tc(8) with its disciplines (e.g. netem).\n\n"
1070 "Please report bugs to <bugs@netsniff-ng.org>\n"
1071 "Copyright (C) 2009-2013 Daniel Borkmann <dborkma@tik.ee.ethz.ch>\n"
1072 "Copyright (C) 2009-2012 Emmanuel Roullit <emmanuel.roullit@gmail.com>\n"
1073 "Copyright (C) 2012 Markus Amend <markus@netsniff-ng.org>\n"
1074 "Swiss federal institute of technology (ETH Zurich)\n"
1075 "License: GNU GPL version 2.0\n"
1076 "This is free software: you are free to change and redistribute it.\n"
1077 "There is NO WARRANTY, to the extent permitted by law.\n");
1081 static void __noreturn
version(void)
1083 printf("\nnetsniff-ng %s, Git id: %s\n", VERSION_LONG
, GITVERSION
);
1084 puts("the packet sniffing beast\n"
1085 "http://www.netsniff-ng.org\n\n"
1086 "Please report bugs to <bugs@netsniff-ng.org>\n"
1087 "Copyright (C) 2009-2013 Daniel Borkmann <dborkma@tik.ee.ethz.ch>\n"
1088 "Copyright (C) 2009-2012 Emmanuel Roullit <emmanuel.roullit@gmail.com>\n"
1089 "Copyright (C) 2012 Markus Amend <markus@netsniff-ng.org>\n"
1090 "Swiss federal institute of technology (ETH Zurich)\n"
1091 "License: GNU GPL version 2.0\n"
1092 "This is free software: you are free to change and redistribute it.\n"
1093 "There is NO WARRANTY, to the extent permitted by law.\n");
1097 int main(int argc
, char **argv
)
1100 int c
, i
, j
, cpu_tmp
, opt_index
, ops_touched
= 0, vals
[4] = {0};
1101 bool prio_high
= false, setsockmem
= true;
1102 void (*main_loop
)(struct ctx
*ctx
) = NULL
;
1108 while ((c
= getopt_long(argc
, argv
, short_options
, long_options
,
1109 &opt_index
)) != EOF
) {
1113 ctx
.device_in
= xstrdup(optarg
);
1116 ctx
.device_out
= xstrdup(optarg
);
1119 ctx
.prefix
= xstrdup(optarg
);
1122 ctx
.link_type
= LINKTYPE_IEEE802_11
;
1126 ctx
.randomize
= true;
1132 ctx
.magic
= (uint32_t) strtoul(optarg
, NULL
, 0);
1133 pcap_check_magic(ctx
.magic
);
1136 ctx
.filter
= xstrdup(optarg
);
1139 ctx
.promiscuous
= false;
1145 ctx
.uid
= strtoul(optarg
, NULL
, 0);
1149 ctx
.gid
= strtoul(optarg
, NULL
, 0);
1153 if (!strncmp(optarg
, "host", strlen("host")))
1154 ctx
.packet_type
= PACKET_HOST
;
1155 else if (!strncmp(optarg
, "broadcast", strlen("broadcast")))
1156 ctx
.packet_type
= PACKET_BROADCAST
;
1157 else if (!strncmp(optarg
, "multicast", strlen("multicast")))
1158 ctx
.packet_type
= PACKET_MULTICAST
;
1159 else if (!strncmp(optarg
, "others", strlen("others")))
1160 ctx
.packet_type
= PACKET_OTHERHOST
;
1161 else if (!strncmp(optarg
, "outgoing", strlen("outgoing")))
1162 ctx
.packet_type
= PACKET_OUTGOING
;
1164 ctx
.packet_type
= -1;
1168 for (j
= i
= strlen(optarg
); i
> 0; --i
) {
1169 if (!isdigit(optarg
[j
- i
]))
1174 if (!strncmp(ptr
, "KiB", strlen("KiB")))
1175 ctx
.reserve_size
= 1 << 10;
1176 else if (!strncmp(ptr
, "MiB", strlen("MiB")))
1177 ctx
.reserve_size
= 1 << 20;
1178 else if (!strncmp(ptr
, "GiB", strlen("GiB")))
1179 ctx
.reserve_size
= 1 << 30;
1181 panic("Syntax error in ring size param!\n");
1183 ctx
.reserve_size
*= strtoul(optarg
, NULL
, 0);
1186 cpu_tmp
= strtol(optarg
, NULL
, 0);
1188 cpu_affinity(cpu_tmp
);
1196 ctx
.pcap
= PCAP_OPS_RW
;
1200 ctx
.pcap
= PCAP_OPS_MM
;
1204 ctx
.pcap
= PCAP_OPS_SG
;
1211 ctx
.print_mode
= PRINT_NONE
;
1214 ctx
.print_mode
= PRINT_LESS
;
1218 (ctx
.print_mode
== PRINT_ASCII
) ?
1219 PRINT_HEX_ASCII
: PRINT_HEX
;
1223 (ctx
.print_mode
== PRINT_HEX
) ?
1224 PRINT_HEX_ASCII
: PRINT_ASCII
;
1227 ctx
.kpull
= strtoul(optarg
, NULL
, 0);
1230 frame_count_max
= strtoul(optarg
, NULL
, 0);
1234 for (j
= i
= strlen(optarg
); i
> 0; --i
) {
1235 if (!isdigit(optarg
[j
- i
]))
1240 if (!strncmp(ptr
, "KiB", strlen("KiB"))) {
1241 ctx
.dump_interval
= 1 << 10;
1242 ctx
.dump_mode
= DUMP_INTERVAL_SIZE
;
1243 } else if (!strncmp(ptr
, "MiB", strlen("MiB"))) {
1244 ctx
.dump_interval
= 1 << 20;
1245 ctx
.dump_mode
= DUMP_INTERVAL_SIZE
;
1246 } else if (!strncmp(ptr
, "GiB", strlen("GiB"))) {
1247 ctx
.dump_interval
= 1 << 30;
1248 ctx
.dump_mode
= DUMP_INTERVAL_SIZE
;
1249 } else if (!strncmp(ptr
, "sec", strlen("sec"))) {
1250 ctx
.dump_interval
= 1;
1251 ctx
.dump_mode
= DUMP_INTERVAL_TIME
;
1252 } else if (!strncmp(ptr
, "min", strlen("min"))) {
1253 ctx
.dump_interval
= 60;
1254 ctx
.dump_mode
= DUMP_INTERVAL_TIME
;
1255 } else if (!strncmp(ptr
, "hrs", strlen("hrs"))) {
1256 ctx
.dump_interval
= 60 * 60;
1257 ctx
.dump_mode
= DUMP_INTERVAL_TIME
;
1258 } else if (!strncmp(ptr
, "s", strlen("s"))) {
1259 ctx
.dump_interval
= 1;
1260 ctx
.dump_mode
= DUMP_INTERVAL_TIME
;
1262 panic("Syntax error in time/size param!\n");
1265 ctx
.dump_interval
*= strtoul(optarg
, NULL
, 0);
1271 ctx
.dump_bpf
= true;
1274 pcap_dump_type_features();
1304 panic("Option -%c requires an argument!\n",
1307 if (isprint(optopt
))
1308 printf("Unknown option character `0x%X\'!\n", optopt
);
1316 if (!ctx
.filter
&& optind
!= argc
) {
1320 for (i
= optind
; i
< argc
; ++i
) {
1321 size_t alen
= strlen(argv
[i
]) + 2;
1322 size_t flen
= ctx
.filter
? strlen(ctx
.filter
) : 0;
1324 ctx
.filter
= xrealloc(ctx
.filter
, 1, flen
+ alen
);
1325 ret
= slprintf(ctx
.filter
+ offset
, strlen(argv
[i
]) + 2, "%s ", argv
[i
]);
1327 panic("Cannot concatenate filter string!\n");
1334 ctx
.device_in
= xstrdup("any");
1336 register_signal(SIGINT
, signal_handler
);
1337 register_signal(SIGQUIT
, signal_handler
);
1338 register_signal(SIGTERM
, signal_handler
);
1339 register_signal(SIGHUP
, signal_handler
);
1345 set_sched_status(SCHED_FIFO
, sched_get_priority_max(SCHED_FIFO
));
1348 if (ctx
.device_in
&& (device_mtu(ctx
.device_in
) ||
1349 !strncmp("any", ctx
.device_in
, strlen(ctx
.device_in
)))) {
1351 ctx
.link_type
= pcap_devtype_to_linktype(ctx
.device_in
);
1352 if (!ctx
.device_out
) {
1354 main_loop
= recv_only_or_dump
;
1355 } else if (device_mtu(ctx
.device_out
)) {
1356 register_signal_f(SIGALRM
, timer_elapsed
, SA_SIGINFO
);
1357 main_loop
= receive_to_xmit
;
1360 register_signal_f(SIGALRM
, timer_next_dump
, SA_SIGINFO
);
1361 main_loop
= recv_only_or_dump
;
1363 ctx
.pcap
= PCAP_OPS_SG
;
1366 if (ctx
.device_out
&& device_mtu(ctx
.device_out
)) {
1367 register_signal_f(SIGALRM
, timer_elapsed
, SA_SIGINFO
);
1368 main_loop
= pcap_to_xmit
;
1370 ctx
.pcap
= PCAP_OPS_MM
;
1372 main_loop
= read_pcap
;
1374 ctx
.pcap
= PCAP_OPS_SG
;
1382 set_system_socket_memory(vals
, array_size(vals
));
1387 printf("pcap file I/O method: %s\n", pcap_ops_group_to_str
[ctx
.pcap
]);
1394 reset_system_socket_memory(vals
, array_size(vals
));
1397 device_restore_irq_affinity_list();