2 * netsniff-ng - the packet sniffing beast
3 * By Daniel Borkmann <daniel@netsniff-ng.org>
4 * Copyright 2009-2013 Daniel Borkmann.
5 * Copyright 2010 Emmanuel Roullit.
6 * Subject to the GPL, version 2.
8 * The first sniffer that invoked both, the zero-copy RX_RING as well as
9 * the zero-copy TX_RING for high-performance network I/O and scatter/gather
12 * "I knew that danger lay ahead, of course; but I did not expect to
13 * meet it in our own Shire. Can't a hobbit walk from the Water to the
14 * River in peace?" "But it is not your own Shire," said Gildor. "Others
15 * dwelt here before hobbits were; and others will dwell here again when
16 * hobbits are no more. The wide world is all about you: you can fence
17 * yourselves in, but you cannot for ever fence it out."
19 * -- The Lord of the Rings, Gildor to Frodo,
20 * Chapter 'Three is Company'.
31 #include <sys/socket.h>
32 #include <sys/types.h>
35 #include <sys/fsuid.h>
51 #include "dissector.h"
60 char *device_in
, *device_out
, *device_trans
, *filter
, *prefix
;
61 int cpu
, rfraw
, dump
, print_mode
, dump_dir
, packet_type
, verbose
;
62 unsigned long kpull
, dump_interval
, reserve_size
, tx_bytes
, tx_packets
;
63 bool randomize
, promiscuous
, enforce
, jumbo
, dump_bpf
;
64 enum pcap_ops_groups pcap
; enum dump_mode dump_mode
;
65 uid_t uid
; gid_t gid
; uint32_t link_type
, magic
;
68 volatile sig_atomic_t sigint
= 0;
70 static volatile bool next_dump
= false;
72 static const char *short_options
= "d:i:o:rf:MJt:S:k:n:b:HQmcsqXlvhF:RGAP:Vu:g:T:DB";
73 static const struct option long_options
[] = {
74 {"dev", required_argument
, NULL
, 'd'},
75 {"in", required_argument
, NULL
, 'i'},
76 {"out", required_argument
, NULL
, 'o'},
77 {"filter", required_argument
, NULL
, 'f'},
78 {"num", required_argument
, NULL
, 'n'},
79 {"type", required_argument
, NULL
, 't'},
80 {"interval", required_argument
, NULL
, 'F'},
81 {"ring-size", required_argument
, NULL
, 'S'},
82 {"kernel-pull", required_argument
, NULL
, 'k'},
83 {"bind-cpu", required_argument
, NULL
, 'b'},
84 {"prefix", required_argument
, NULL
, 'P'},
85 {"user", required_argument
, NULL
, 'u'},
86 {"group", required_argument
, NULL
, 'g'},
87 {"magic", required_argument
, NULL
, 'T'},
88 {"rand", no_argument
, NULL
, 'r'},
89 {"rfraw", no_argument
, NULL
, 'R'},
90 {"mmap", no_argument
, NULL
, 'm'},
91 {"sg", no_argument
, NULL
, 'G'},
92 {"clrw", no_argument
, NULL
, 'c'},
93 {"jumbo-support", no_argument
, NULL
, 'J'},
94 {"no-promisc", no_argument
, NULL
, 'M'},
95 {"prio-high", no_argument
, NULL
, 'H'},
96 {"notouch-irq", no_argument
, NULL
, 'Q'},
97 {"dump-pcap-types", no_argument
, NULL
, 'D'},
98 {"dump-bpf", no_argument
, NULL
, 'B'},
99 {"silent", no_argument
, NULL
, 's'},
100 {"less", no_argument
, NULL
, 'q'},
101 {"hex", no_argument
, NULL
, 'X'},
102 {"ascii", no_argument
, NULL
, 'l'},
103 {"no-sock-mem", no_argument
, NULL
, 'A'},
104 {"verbose", no_argument
, NULL
, 'V'},
105 {"version", no_argument
, NULL
, 'v'},
106 {"help", no_argument
, NULL
, 'h'},
112 static struct itimerval itimer
;
114 static unsigned long frame_count_max
= 0, interval
= TX_KERNEL_PULL_INT
;
116 #define __pcap_io pcap_ops[ctx->pcap]
118 static void signal_handler(int number
)
129 static void timer_elapsed(int unused
)
131 set_itimer_interval_value(&itimer
, 0, interval
);
132 pull_and_flush_tx_ring(tx_sock
);
133 setitimer(ITIMER_REAL
, &itimer
, NULL
);
136 static void timer_next_dump(int unused
)
138 set_itimer_interval_value(&itimer
, 0, interval
);
140 setitimer(ITIMER_REAL
, &itimer
, NULL
);
143 static inline bool dump_to_pcap(struct ctx
*ctx
)
148 static void pcap_to_xmit(struct ctx
*ctx
)
152 int irq
, ifindex
, fd
= 0, ret
;
153 unsigned int size
, it
= 0;
154 unsigned long trunced
= 0;
156 struct frame_map
*hdr
;
157 struct sock_fprog bpf_ops
;
158 struct timeval start
, end
, diff
;
161 if (!device_up_and_running(ctx
->device_out
) && !ctx
->rfraw
)
162 panic("Device not up and running!\n");
166 tx_sock
= pf_socket();
168 if (!strncmp("-", ctx
->device_in
, strlen("-"))) {
169 fd
= dup(fileno(stdin
));
170 close(fileno(stdin
));
171 if (ctx
->pcap
== PCAP_OPS_MM
)
172 ctx
->pcap
= PCAP_OPS_SG
;
174 fd
= open_or_die(ctx
->device_in
, O_RDONLY
| O_LARGEFILE
| O_NOATIME
);
177 ret
= __pcap_io
->pull_fhdr_pcap(fd
, &ctx
->magic
, &ctx
->link_type
);
179 panic("Error reading pcap header!\n");
181 if (__pcap_io
->prepare_access_pcap
) {
182 ret
= __pcap_io
->prepare_access_pcap(fd
, PCAP_MODE_RD
, ctx
->jumbo
);
184 panic("Error prepare reading pcap!\n");
187 fmemset(&tx_ring
, 0, sizeof(tx_ring
));
188 fmemset(&bpf_ops
, 0, sizeof(bpf_ops
));
191 ctx
->device_trans
= xstrdup(ctx
->device_out
);
192 xfree(ctx
->device_out
);
194 enter_rfmon_mac80211(ctx
->device_trans
, &ctx
->device_out
);
195 if (ctx
->link_type
!= LINKTYPE_IEEE802_11
)
196 panic("Wrong linktype of pcap!\n");
199 ifindex
= device_ifindex(ctx
->device_out
);
201 size
= ring_size(ctx
->device_out
, ctx
->reserve_size
);
203 bpf_parse_rules(ctx
->device_out
, ctx
->filter
, &bpf_ops
);
205 bpf_dump_all(&bpf_ops
);
207 set_packet_loss_discard(tx_sock
);
208 set_sockopt_hwtimestamp(tx_sock
, ctx
->device_out
);
210 setup_tx_ring_layout(tx_sock
, &tx_ring
, size
, ctx
->jumbo
);
211 create_tx_ring(tx_sock
, &tx_ring
, ctx
->verbose
);
212 mmap_tx_ring(tx_sock
, &tx_ring
);
213 alloc_tx_ring_frames(&tx_ring
);
214 bind_tx_ring(tx_sock
, &tx_ring
, ifindex
);
216 dissector_init_all(ctx
->print_mode
);
218 if (ctx
->cpu
>= 0 && ifindex
> 0) {
219 irq
= device_irq_number(ctx
->device_out
);
220 device_bind_irq_to_cpu(irq
, ctx
->cpu
);
223 printf("IRQ: %s:%d > CPU%d\n",
224 ctx
->device_out
, irq
, ctx
->cpu
);
228 interval
= ctx
->kpull
;
230 set_itimer_interval_value(&itimer
, 0, interval
);
231 setitimer(ITIMER_REAL
, &itimer
, NULL
);
233 drop_privileges(ctx
->enforce
, ctx
->uid
, ctx
->gid
);
235 printf("Running! Hang up with ^C!\n\n");
238 bug_on(gettimeofday(&start
, NULL
));
240 while (likely(sigint
== 0)) {
241 while (user_may_pull_from_tx(tx_ring
.frames
[it
].iov_base
)) {
242 hdr
= tx_ring
.frames
[it
].iov_base
;
243 out
= ((uint8_t *) hdr
) + TPACKET2_HDRLEN
- sizeof(struct sockaddr_ll
);
246 ret
= __pcap_io
->read_pcap(fd
, &phdr
, ctx
->magic
, out
,
247 ring_frame_size(&tx_ring
));
248 if (unlikely(ret
<= 0))
251 if (ring_frame_size(&tx_ring
) <
252 pcap_get_length(&phdr
, ctx
->magic
)) {
253 pcap_set_length(&phdr
, ctx
->magic
,
254 ring_frame_size(&tx_ring
));
257 } while (ctx
->filter
&&
258 !bpf_run_filter(&bpf_ops
, out
,
259 pcap_get_length(&phdr
, ctx
->magic
)));
261 pcap_pkthdr_to_tpacket_hdr(&phdr
, ctx
->magic
, &hdr
->tp_h
, &hdr
->s_ll
);
263 ctx
->tx_bytes
+= hdr
->tp_h
.tp_len
;;
266 show_frame_hdr(hdr
, ctx
->print_mode
);
268 dissector_entry_point(out
, hdr
->tp_h
.tp_snaplen
,
269 ctx
->link_type
, ctx
->print_mode
);
271 kernel_may_pull_from_tx(&hdr
->tp_h
);
274 if (it
>= tx_ring
.layout
.tp_frame_nr
)
277 if (unlikely(sigint
== 1))
280 if (frame_count_max
!= 0) {
281 if (ctx
->tx_packets
>= frame_count_max
) {
291 bug_on(gettimeofday(&end
, NULL
));
292 diff
= tv_subtract(end
, start
);
294 bpf_release(&bpf_ops
);
296 dissector_cleanup_all();
297 destroy_tx_ring(tx_sock
, &tx_ring
);
300 leave_rfmon_mac80211(ctx
->device_trans
, ctx
->device_out
);
302 if (__pcap_io
->prepare_close_pcap
)
303 __pcap_io
->prepare_close_pcap(fd
, PCAP_MODE_RD
);
305 if (strncmp("-", ctx
->device_in
, strlen("-")))
308 dup2(fd
, fileno(stdin
));
314 printf("\r%12lu packets outgoing\n", ctx
->tx_packets
);
315 printf("\r%12lu packets truncated in file\n", trunced
);
316 printf("\r%12lu bytes outgoing\n", ctx
->tx_bytes
);
317 printf("\r%12lu sec, %lu usec in total\n", diff
.tv_sec
, diff
.tv_usec
);
320 static void receive_to_xmit(struct ctx
*ctx
)
324 int rx_sock
, ifindex_in
, ifindex_out
;
325 unsigned int size_in
, size_out
, it_in
= 0, it_out
= 0;
326 unsigned long frame_count
= 0;
327 struct frame_map
*hdr_in
, *hdr_out
;
328 struct ring tx_ring
, rx_ring
;
329 struct pollfd rx_poll
;
330 struct sock_fprog bpf_ops
;
332 if (!strncmp(ctx
->device_in
, ctx
->device_out
, IFNAMSIZ
))
333 panic("Ingress/egress devices must be different!\n");
334 if (!device_up_and_running(ctx
->device_out
))
335 panic("Egress device not up and running!\n");
336 if (!device_up_and_running(ctx
->device_in
))
337 panic("Ingress device not up and running!\n");
339 rx_sock
= pf_socket();
340 tx_sock
= pf_socket();
342 fmemset(&tx_ring
, 0, sizeof(tx_ring
));
343 fmemset(&rx_ring
, 0, sizeof(rx_ring
));
344 fmemset(&rx_poll
, 0, sizeof(rx_poll
));
345 fmemset(&bpf_ops
, 0, sizeof(bpf_ops
));
347 ifindex_in
= device_ifindex(ctx
->device_in
);
348 ifindex_out
= device_ifindex(ctx
->device_out
);
350 size_in
= ring_size(ctx
->device_in
, ctx
->reserve_size
);
351 size_out
= ring_size(ctx
->device_out
, ctx
->reserve_size
);
353 enable_kernel_bpf_jit_compiler();
355 bpf_parse_rules(ctx
->device_in
, ctx
->filter
, &bpf_ops
);
357 bpf_dump_all(&bpf_ops
);
358 bpf_attach_to_sock(rx_sock
, &bpf_ops
);
360 setup_rx_ring_layout(rx_sock
, &rx_ring
, size_in
, ctx
->jumbo
);
361 create_rx_ring(rx_sock
, &rx_ring
, ctx
->verbose
);
362 mmap_rx_ring(rx_sock
, &rx_ring
);
363 alloc_rx_ring_frames(&rx_ring
);
364 bind_rx_ring(rx_sock
, &rx_ring
, ifindex_in
);
365 prepare_polling(rx_sock
, &rx_poll
);
367 set_packet_loss_discard(tx_sock
);
368 setup_tx_ring_layout(tx_sock
, &tx_ring
, size_out
, ctx
->jumbo
);
369 create_tx_ring(tx_sock
, &tx_ring
, ctx
->verbose
);
370 mmap_tx_ring(tx_sock
, &tx_ring
);
371 alloc_tx_ring_frames(&tx_ring
);
372 bind_tx_ring(tx_sock
, &tx_ring
, ifindex_out
);
374 dissector_init_all(ctx
->print_mode
);
376 if (ctx
->promiscuous
)
377 ifflags
= enter_promiscuous_mode(ctx
->device_in
);
380 interval
= ctx
->kpull
;
382 set_itimer_interval_value(&itimer
, 0, interval
);
383 setitimer(ITIMER_REAL
, &itimer
, NULL
);
385 drop_privileges(ctx
->enforce
, ctx
->uid
, ctx
->gid
);
387 printf("Running! Hang up with ^C!\n\n");
390 while (likely(sigint
== 0)) {
391 while (user_may_pull_from_rx(rx_ring
.frames
[it_in
].iov_base
)) {
394 hdr_in
= rx_ring
.frames
[it_in
].iov_base
;
395 in
= ((uint8_t *) hdr_in
) + hdr_in
->tp_h
.tp_mac
;
399 if (ctx
->packet_type
!= -1)
400 if (ctx
->packet_type
!= hdr_in
->s_ll
.sll_pkttype
)
403 hdr_out
= tx_ring
.frames
[it_out
].iov_base
;
404 out
= ((uint8_t *) hdr_out
) + TPACKET2_HDRLEN
- sizeof(struct sockaddr_ll
);
406 for (; !user_may_pull_from_tx(tx_ring
.frames
[it_out
].iov_base
) &&
409 next_rnd_slot(&it_out
, &tx_ring
);
412 if (it_out
>= tx_ring
.layout
.tp_frame_nr
)
416 hdr_out
= tx_ring
.frames
[it_out
].iov_base
;
417 out
= ((uint8_t *) hdr_out
) + TPACKET2_HDRLEN
- sizeof(struct sockaddr_ll
);
420 tpacket_hdr_clone(&hdr_out
->tp_h
, &hdr_in
->tp_h
);
421 fmemcpy(out
, in
, hdr_in
->tp_h
.tp_len
);
423 kernel_may_pull_from_tx(&hdr_out
->tp_h
);
425 next_rnd_slot(&it_out
, &tx_ring
);
428 if (it_out
>= tx_ring
.layout
.tp_frame_nr
)
432 show_frame_hdr(hdr_in
, ctx
->print_mode
);
434 dissector_entry_point(in
, hdr_in
->tp_h
.tp_snaplen
,
435 ctx
->link_type
, ctx
->print_mode
);
437 if (frame_count_max
!= 0) {
438 if (frame_count
>= frame_count_max
) {
446 kernel_may_pull_from_rx(&hdr_in
->tp_h
);
449 if (it_in
>= rx_ring
.layout
.tp_frame_nr
)
452 if (unlikely(sigint
== 1))
456 poll(&rx_poll
, 1, -1);
457 poll_error_maybe_die(rx_sock
, &rx_poll
);
462 sock_print_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 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
)
515 int ret
, fd
, fdo
= 0;
516 unsigned long trunced
= 0;
519 struct sock_fprog bpf_ops
;
521 struct timeval start
, end
, diff
;
522 struct sockaddr_ll sll
;
526 if (!strncmp("-", ctx
->device_in
, strlen("-"))) {
527 fd
= dup(fileno(stdin
));
528 close(fileno(stdin
));
529 if (ctx
->pcap
== PCAP_OPS_MM
)
530 ctx
->pcap
= PCAP_OPS_SG
;
532 fd
= open_or_die(ctx
->device_in
, O_RDONLY
| O_LARGEFILE
| O_NOATIME
);
535 ret
= __pcap_io
->pull_fhdr_pcap(fd
, &ctx
->magic
, &ctx
->link_type
);
537 panic("Error reading pcap header!\n");
539 if (__pcap_io
->prepare_access_pcap
) {
540 ret
= __pcap_io
->prepare_access_pcap(fd
, PCAP_MODE_RD
, ctx
->jumbo
);
542 panic("Error prepare reading pcap!\n");
545 fmemset(&fm
, 0, sizeof(fm
));
546 fmemset(&bpf_ops
, 0, sizeof(bpf_ops
));
548 bpf_parse_rules("any", ctx
->filter
, &bpf_ops
);
550 bpf_dump_all(&bpf_ops
);
552 dissector_init_all(ctx
->print_mode
);
554 out_len
= round_up(1024 * 1024, 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(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
, &sll
);
596 ctx
->tx_bytes
+= fm
.tp_h
.tp_len
;
599 show_frame_hdr(&fm
, ctx
->print_mode
);
601 dissector_entry_point(out
, fm
.tp_h
.tp_snaplen
,
602 ctx
->link_type
, ctx
->print_mode
);
605 translate_pcap_to_txf(fdo
, out
, fm
.tp_h
.tp_snaplen
);
607 if (frame_count_max
!= 0) {
608 if (ctx
->tx_packets
>= frame_count_max
) {
617 bug_on(gettimeofday(&end
, NULL
));
618 diff
= tv_subtract(end
, start
);
620 bpf_release(&bpf_ops
);
622 dissector_cleanup_all();
624 if (__pcap_io
->prepare_close_pcap
)
625 __pcap_io
->prepare_close_pcap(fd
, PCAP_MODE_RD
);
631 printf("\r%12lu packets outgoing\n", ctx
->tx_packets
);
632 printf("\r%12lu packets truncated in file\n", trunced
);
633 printf("\r%12lu bytes outgoing\n", ctx
->tx_bytes
);
634 printf("\r%12lu sec, %lu usec in total\n", diff
.tv_sec
, diff
.tv_usec
);
636 if (strncmp("-", ctx
->device_in
, strlen("-")))
639 dup2(fd
, fileno(stdin
));
641 if (ctx
->device_out
) {
642 if (strncmp("-", ctx
->device_out
, strlen("-")))
645 dup2(fdo
, fileno(stdout
));
649 static void finish_multi_pcap_file(struct ctx
*ctx
, int fd
)
651 __pcap_io
->fsync_pcap(fd
);
653 if (__pcap_io
->prepare_close_pcap
)
654 __pcap_io
->prepare_close_pcap(fd
, PCAP_MODE_WR
);
658 fmemset(&itimer
, 0, sizeof(itimer
));
659 setitimer(ITIMER_REAL
, &itimer
, NULL
);
662 static int next_multi_pcap_file(struct ctx
*ctx
, int fd
)
667 __pcap_io
->fsync_pcap(fd
);
669 if (__pcap_io
->prepare_close_pcap
)
670 __pcap_io
->prepare_close_pcap(fd
, PCAP_MODE_WR
);
674 slprintf(fname
, sizeof(fname
), "%s/%s%lu.pcap", ctx
->device_out
,
675 ctx
->prefix
? : "dump-", time(0));
677 fd
= open_or_die_m(fname
, O_RDWR
| O_CREAT
| O_TRUNC
|
678 O_LARGEFILE
, DEFFILEMODE
);
680 ret
= __pcap_io
->push_fhdr_pcap(fd
, ctx
->magic
, ctx
->link_type
);
682 panic("Error writing pcap header!\n");
684 if (__pcap_io
->prepare_access_pcap
) {
685 ret
= __pcap_io
->prepare_access_pcap(fd
, PCAP_MODE_WR
, ctx
->jumbo
);
687 panic("Error prepare writing pcap!\n");
693 static int begin_multi_pcap_file(struct ctx
*ctx
)
700 if (ctx
->device_out
[strlen(ctx
->device_out
) - 1] == '/')
701 ctx
->device_out
[strlen(ctx
->device_out
) - 1] = 0;
703 slprintf(fname
, sizeof(fname
), "%s/%s%lu.pcap", ctx
->device_out
,
704 ctx
->prefix
? : "dump-", time(0));
706 fd
= open_or_die_m(fname
, O_RDWR
| O_CREAT
| O_TRUNC
|
707 O_LARGEFILE
, DEFFILEMODE
);
709 ret
= __pcap_io
->push_fhdr_pcap(fd
, ctx
->magic
, ctx
->link_type
);
711 panic("Error writing pcap header!\n");
713 if (__pcap_io
->prepare_access_pcap
) {
714 ret
= __pcap_io
->prepare_access_pcap(fd
, PCAP_MODE_WR
, ctx
->jumbo
);
716 panic("Error prepare writing pcap!\n");
719 if (ctx
->dump_mode
== DUMP_INTERVAL_TIME
) {
720 interval
= ctx
->dump_interval
;
722 set_itimer_interval_value(&itimer
, interval
, 0);
723 setitimer(ITIMER_REAL
, &itimer
, NULL
);
731 static void finish_single_pcap_file(struct ctx
*ctx
, int fd
)
733 __pcap_io
->fsync_pcap(fd
);
735 if (__pcap_io
->prepare_close_pcap
)
736 __pcap_io
->prepare_close_pcap(fd
, PCAP_MODE_WR
);
738 if (strncmp("-", ctx
->device_out
, strlen("-")))
741 dup2(fd
, fileno(stdout
));
744 static int begin_single_pcap_file(struct ctx
*ctx
)
750 if (!strncmp("-", ctx
->device_out
, strlen("-"))) {
751 fd
= dup(fileno(stdout
));
752 close(fileno(stdout
));
753 if (ctx
->pcap
== PCAP_OPS_MM
)
754 ctx
->pcap
= PCAP_OPS_SG
;
756 fd
= open_or_die_m(ctx
->device_out
,
757 O_RDWR
| O_CREAT
| O_TRUNC
|
758 O_LARGEFILE
, DEFFILEMODE
);
761 ret
= __pcap_io
->push_fhdr_pcap(fd
, ctx
->magic
, ctx
->link_type
);
763 panic("Error writing pcap header!\n");
765 if (__pcap_io
->prepare_access_pcap
) {
766 ret
= __pcap_io
->prepare_access_pcap(fd
, PCAP_MODE_WR
, ctx
->jumbo
);
768 panic("Error prepare writing pcap!\n");
774 static void print_pcap_file_stats(int sock
, struct ctx
*ctx
, unsigned long skipped
)
776 unsigned long good
, bad
;
777 struct tpacket_stats kstats
;
778 socklen_t slen
= sizeof(kstats
);
780 fmemset(&kstats
, 0, sizeof(kstats
));
781 getsockopt(sock
, SOL_PACKET
, PACKET_STATISTICS
, &kstats
, &slen
);
783 if (ctx
->print_mode
== PRINT_NONE
) {
784 good
= kstats
.tp_packets
- kstats
.tp_drops
- skipped
;
785 bad
= kstats
.tp_drops
+ skipped
;
787 printf(".(+%lu/-%lu)", good
, bad
);
792 static void recv_only_or_dump(struct ctx
*ctx
)
796 int sock
, irq
, ifindex
, fd
= 0, ret
;
797 unsigned int size
, it
= 0;
798 unsigned long frame_count
= 0, skipped
= 0;
800 struct pollfd rx_poll
;
801 struct frame_map
*hdr
;
802 struct sock_fprog bpf_ops
;
803 struct timeval start
, end
, diff
;
806 if (!device_up_and_running(ctx
->device_in
) && !ctx
->rfraw
)
807 panic("Device not up and running!\n");
812 ctx
->device_trans
= xstrdup(ctx
->device_in
);
813 xfree(ctx
->device_in
);
815 enter_rfmon_mac80211(ctx
->device_trans
, &ctx
->device_in
);
816 ctx
->link_type
= LINKTYPE_IEEE802_11
;
819 fmemset(&rx_ring
, 0, sizeof(rx_ring
));
820 fmemset(&rx_poll
, 0, sizeof(rx_poll
));
821 fmemset(&bpf_ops
, 0, sizeof(bpf_ops
));
823 ifindex
= device_ifindex(ctx
->device_in
);
825 size
= ring_size(ctx
->device_in
, ctx
->reserve_size
);
827 enable_kernel_bpf_jit_compiler();
829 bpf_parse_rules(ctx
->device_in
, ctx
->filter
, &bpf_ops
);
831 bpf_dump_all(&bpf_ops
);
832 bpf_attach_to_sock(sock
, &bpf_ops
);
834 set_sockopt_hwtimestamp(sock
, ctx
->device_in
);
836 setup_rx_ring_layout(sock
, &rx_ring
, size
, ctx
->jumbo
);
837 create_rx_ring(sock
, &rx_ring
, ctx
->verbose
);
838 mmap_rx_ring(sock
, &rx_ring
);
839 alloc_rx_ring_frames(&rx_ring
);
840 bind_rx_ring(sock
, &rx_ring
, ifindex
);
842 prepare_polling(sock
, &rx_poll
);
843 dissector_init_all(ctx
->print_mode
);
845 if (ctx
->cpu
>= 0 && ifindex
> 0) {
846 irq
= device_irq_number(ctx
->device_in
);
847 device_bind_irq_to_cpu(irq
, ctx
->cpu
);
850 printf("IRQ: %s:%d > CPU%d\n",
851 ctx
->device_in
, irq
, ctx
->cpu
);
854 if (ctx
->promiscuous
)
855 ifflags
= enter_promiscuous_mode(ctx
->device_in
);
857 drop_privileges(ctx
->enforce
, ctx
->uid
, ctx
->gid
);
859 if (dump_to_pcap(ctx
)) {
863 fmemset(&stats
, 0, sizeof(stats
));
864 ret
= stat(ctx
->device_out
, &stats
);
870 ctx
->dump_dir
= S_ISDIR(stats
.st_mode
);
872 fd
= begin_multi_pcap_file(ctx
);
875 fd
= begin_single_pcap_file(ctx
);
879 printf("Running! Hang up with ^C!\n\n");
882 bug_on(gettimeofday(&start
, NULL
));
884 while (likely(sigint
== 0)) {
885 while (user_may_pull_from_rx(rx_ring
.frames
[it
].iov_base
)) {
888 hdr
= rx_ring
.frames
[it
].iov_base
;
889 packet
= ((uint8_t *) hdr
) + hdr
->tp_h
.tp_mac
;
892 if (ctx
->packet_type
!= -1)
893 if (ctx
->packet_type
!= hdr
->s_ll
.sll_pkttype
)
896 if (unlikely(ring_frame_size(&rx_ring
) < hdr
->tp_h
.tp_snaplen
)) {
901 if (dump_to_pcap(ctx
)) {
902 tpacket_hdr_to_pcap_pkthdr(&hdr
->tp_h
, &hdr
->s_ll
, &phdr
, ctx
->magic
);
904 ret
= __pcap_io
->write_pcap(fd
, &phdr
, ctx
->magic
, packet
,
905 pcap_get_length(&phdr
, ctx
->magic
));
906 if (unlikely(ret
!= pcap_get_total_length(&phdr
, ctx
->magic
)))
907 panic("Write error to pcap!\n");
910 show_frame_hdr(hdr
, ctx
->print_mode
);
912 dissector_entry_point(packet
, hdr
->tp_h
.tp_snaplen
,
913 ctx
->link_type
, ctx
->print_mode
);
915 if (frame_count_max
!= 0) {
916 if (frame_count
>= frame_count_max
) {
924 kernel_may_pull_from_rx(&hdr
->tp_h
);
927 if (it
>= rx_ring
.layout
.tp_frame_nr
)
930 if (unlikely(sigint
== 1))
933 if (dump_to_pcap(ctx
)) {
934 if (ctx
->dump_mode
== DUMP_INTERVAL_SIZE
) {
935 interval
+= hdr
->tp_h
.tp_snaplen
;
937 if (interval
> ctx
->dump_interval
) {
944 fd
= next_multi_pcap_file(ctx
, fd
);
948 print_pcap_file_stats(sock
, ctx
, skipped
);
953 poll(&rx_poll
, 1, -1);
954 poll_error_maybe_die(sock
, &rx_poll
);
957 bug_on(gettimeofday(&end
, NULL
));
958 diff
= tv_subtract(end
, start
);
960 if (!(ctx
->dump_dir
&& ctx
->print_mode
== PRINT_NONE
)) {
961 sock_print_net_stats(sock
, skipped
);
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 leave_promiscuous_mode(ctx
->device_in
, ifflags
);
978 leave_rfmon_mac80211(ctx
->device_trans
, 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 help(void)
992 printf("\nnetsniff-ng %s, the packet sniffing beast\n", VERSION_STRING
);
993 puts("http://www.netsniff-ng.org\n\n"
994 "Usage: netsniff-ng [options] [filter-expression]\n"
996 " -i|-d|--dev|--in <dev|pcap|-> Input source as netdev, pcap or pcap stdin\n"
997 " -o|--out <dev|pcap|dir|cfg|-> Output sink as netdev, pcap, directory, trafgen, or stdout\n"
998 " -f|--filter <bpf-file|expr> Use BPF filter file from bpfc or tcpdump-like expression\n"
999 " -t|--type <type> Filter for: host|broadcast|multicast|others|outgoing\n"
1000 " -F|--interval <size|time> Dump interval if -o is a dir: <num>KiB/MiB/GiB/s/sec/min/hrs\n"
1001 " -J|--jumbo-support Support for 64KB Super Jumbo Frames (def: 2048B)\n"
1002 " -R|--rfraw Capture or inject raw 802.11 frames\n"
1003 " -n|--num <0|uint> Number of packets until exit (def: 0)\n"
1004 " -P|--prefix <name> Prefix for pcaps stored in directory\n"
1005 " -T|--magic <pcap-magic> Pcap magic number/pcap format to store, see -D\n"
1006 " -D|--dump-pcap-types Dump pcap types and magic numbers and quit\n"
1007 " -B|--dump-bpf Dump generated BPF assembly\n"
1008 " -r|--rand Randomize packet forwarding order (dev->dev)\n"
1009 " -M|--no-promisc No promiscuous mode for netdev\n"
1010 " -A|--no-sock-mem Don't tune core socket memory\n"
1011 " -m|--mmap Mmap(2) pcap file i.e., for replaying pcaps\n"
1012 " -G|--sg Scatter/gather pcap file I/O\n"
1013 " -c|--clrw Use slower read(2)/write(2) I/O\n"
1014 " -S|--ring-size <size> Specify ring size to: <num>KiB/MiB/GiB\n"
1015 " -k|--kernel-pull <uint> Kernel pull from user interval in us (def: 10us)\n"
1016 " -b|--bind-cpu <cpu> Bind to specific CPU\n"
1017 " -u|--user <userid> Drop privileges and change to userid\n"
1018 " -g|--group <groupid> Drop privileges and change to groupid\n"
1019 " -H|--prio-high Make this high priority process\n"
1020 " -Q|--notouch-irq Do not touch IRQ CPU affinity of NIC\n"
1021 " -s|--silent Do not print captured packets\n"
1022 " -q|--less Print less-verbose packet information\n"
1023 " -X|--hex Print packet data in hex format\n"
1024 " -l|--ascii Print human-readable packet data\n"
1025 " -V|--verbose Be more verbose\n"
1026 " -v|--version Show version\n"
1027 " -h|--help Guess what?!\n\n"
1029 " netsniff-ng --in eth0 --out dump.pcap -s -T 0xa1b2c3d4 --b 0 tcp or udp\n"
1030 " netsniff-ng --in wlan0 --rfraw --out dump.pcap --silent --bind-cpu 0\n"
1031 " netsniff-ng --in dump.pcap --mmap --out eth0 -k1000 --silent --bind-cpu 0\n"
1032 " netsniff-ng --in dump.pcap --out dump.cfg --silent --bind-cpu 0\n"
1033 " netsniff-ng --in eth0 --out eth1 --silent --bind-cpu 0 --type host\n"
1034 " netsniff-ng --in eth1 --out /opt/probe/ -s -m -J --interval 100MiB -b 0\n"
1035 " netsniff-ng --in vlan0 --out dump.pcap -c -u `id -u bob` -g `id -g bob`\n"
1036 " netsniff-ng --in any --filter http.bpf --jumbo-support --ascii -V\n\n"
1038 " For introducing bit errors, delays with random variation and more\n"
1039 " while replaying pcaps, make use of tc(8) with its disciplines (e.g. netem).\n\n"
1040 "Please report bugs to <bugs@netsniff-ng.org>\n"
1041 "Copyright (C) 2009-2013 Daniel Borkmann <daniel@netsniff-ng.org>\n"
1042 "Copyright (C) 2009-2012 Emmanuel Roullit <emmanuel@netsniff-ng.org>\n"
1043 "Copyright (C) 2012 Markus Amend <markus@netsniff-ng.org>\n"
1044 "License: GNU GPL version 2.0\n"
1045 "This is free software: you are free to change and redistribute it.\n"
1046 "There is NO WARRANTY, to the extent permitted by law.\n");
1050 static void version(void)
1052 printf("\nnetsniff-ng %s, the packet sniffing beast\n", VERSION_STRING
);
1053 puts("http://www.netsniff-ng.org\n\n"
1054 "Please report bugs to <bugs@netsniff-ng.org>\n"
1055 "Copyright (C) 2009-2013 Daniel Borkmann <daniel@netsniff-ng.org>\n"
1056 "Copyright (C) 2009-2012 Emmanuel Roullit <emmanuel@netsniff-ng.org>\n"
1057 "Copyright (C) 2012 Markus Amend <markus@netsniff-ng.org>\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();
1285 panic("Option -%c requires an argument!\n",
1288 if (isprint(optopt
))
1289 printf("Unknown option character `0x%X\'!\n", optopt
);
1297 if (!ctx
.filter
&& optind
!= argc
) {
1301 for (i
= optind
; i
< argc
; ++i
) {
1302 size_t alen
= strlen(argv
[i
]) + 2;
1303 size_t flen
= ctx
.filter
? strlen(ctx
.filter
) : 0;
1305 ctx
.filter
= xrealloc(ctx
.filter
, 1, flen
+ alen
);
1306 ret
= slprintf(ctx
.filter
+ offset
, strlen(argv
[i
]) + 2, "%s ", argv
[i
]);
1308 panic("Cannot concatenate filter string!\n");
1315 ctx
.device_in
= xstrdup("any");
1317 register_signal(SIGINT
, signal_handler
);
1318 register_signal(SIGHUP
, signal_handler
);
1323 set_proc_prio(get_default_proc_prio());
1324 set_sched_status(get_default_sched_policy(), get_default_sched_prio());
1327 if (ctx
.device_in
&& (device_mtu(ctx
.device_in
) ||
1328 !strncmp("any", ctx
.device_in
, strlen(ctx
.device_in
)))) {
1329 if (!ctx
.device_out
) {
1331 main_loop
= recv_only_or_dump
;
1332 } else if (device_mtu(ctx
.device_out
)) {
1333 register_signal_f(SIGALRM
, timer_elapsed
, SA_SIGINFO
);
1334 main_loop
= receive_to_xmit
;
1337 register_signal_f(SIGALRM
, timer_next_dump
, SA_SIGINFO
);
1338 main_loop
= recv_only_or_dump
;
1340 ctx
.pcap
= PCAP_OPS_SG
;
1343 if (ctx
.device_out
&& device_mtu(ctx
.device_out
)) {
1344 register_signal_f(SIGALRM
, timer_elapsed
, SA_SIGINFO
);
1345 main_loop
= pcap_to_xmit
;
1347 ctx
.pcap
= PCAP_OPS_MM
;
1349 main_loop
= read_pcap
;
1351 ctx
.pcap
= PCAP_OPS_SG
;
1358 set_system_socket_memory(vals
, array_size(vals
));
1365 reset_system_socket_memory(vals
, array_size(vals
));
1369 free(ctx
.device_in
);
1370 free(ctx
.device_out
);
1371 free(ctx
.device_trans
);