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pktvisor.c
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pktvisor.c
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/*
* pktvisor
* Copyright 2015 NSONE, Inc.
* Copyright 2009-2013 Daniel Borkmann.
* Copyright 2010 Emmanuel Roullit.
* Subject to the GPL, version 2.
*/
#define _GNU_SOURCE
#include <stdio.h>
#include <stdlib.h>
#include <signal.h>
#include <getopt.h>
#include <ctype.h>
#include <time.h>
#include <string.h>
#include <sys/socket.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <sys/time.h>
#include <sys/fsuid.h>
#include <unistd.h>
#include <stdbool.h>
#include <pthread.h>
#include <fcntl.h>
#include <sys/socket.h>
#include <netinet/in.h>
#include <arpa/inet.h>
#include "ring_rx.h"
#include "ring_tx.h"
//#include "mac80211.h"
#include "dev.h"
#include "built_in.h"
#include "pcap_io.h"
#include "privs.h"
#include "proc.h"
#include "bpf.h"
#include "ioops.h"
#include "die.h"
#include "irq.h"
#include "str.h"
#include "sig.h"
#include "config.h"
#include "sock.h"
#include "geoip.h"
#include "lockme.h"
#include "tprintf.h"
#include "timer.h"
#include "tstamping.h"
#include "dissector.h"
#include "xmalloc.h"
#include "dnsctxt.h"
#include "pktvisorui.h"
enum dump_mode {
DUMP_INTERVAL_TIME,
DUMP_INTERVAL_SIZE,
};
struct ctx {
char *device_in, *device_out, *device_trans, *filter, *prefix, *local_net, *geoip_loc, *geoip_asn;
int cpu, /*rfraw,*/ dump, print_mode, dump_dir, packet_type, local_prefix;
unsigned long kpull, dump_interval, tx_bytes, tx_packets;
size_t reserve_size;
bool randomize, promiscuous, enforce, jumbo, dump_bpf, hwtimestamp, verbose,
ui;
enum pcap_ops_groups pcap; enum dump_mode dump_mode;
uid_t uid; gid_t gid; uint32_t link_type, magic;
struct dnsctxt dns_ctxt;
};
static volatile sig_atomic_t sigint = 0;
static volatile bool next_dump = false;
static const char *short_options = "d:i:o:rf:MNJt:S:k:n:b:HQmcZYsqXlvhF:GAP:Vu:g:T:DBUL:W:C:a:";
static const struct option long_options[] = {
{"dev", required_argument, NULL, 'd'},
{"in", required_argument, NULL, 'i'},
{"out", required_argument, NULL, 'o'},
{"filter", required_argument, NULL, 'f'},
{"num", required_argument, NULL, 'n'},
{"type", required_argument, NULL, 't'},
{"interval", required_argument, NULL, 'F'},
{"ring-size", required_argument, NULL, 'S'},
{"kernel-pull", required_argument, NULL, 'k'},
{"bind-cpu", required_argument, NULL, 'b'},
{"prefix", required_argument, NULL, 'P'},
{"user", required_argument, NULL, 'u'},
{"group", required_argument, NULL, 'g'},
{"magic", required_argument, NULL, 'T'},
{"rand", no_argument, NULL, 'r'},
// {"rfraw", no_argument, NULL, 'R'},
{"mmap", no_argument, NULL, 'm'},
{"sg", no_argument, NULL, 'G'},
{"clrw", no_argument, NULL, 'c'},
{"jumbo-support", no_argument, NULL, 'J'},
{"no-promisc", no_argument, NULL, 'M'},
{"no-hwtimestamp", no_argument, NULL, 'N'},
{"prio-high", no_argument, NULL, 'H'},
{"notouch-irq", no_argument, NULL, 'Q'},
{"dump-pcap-types", no_argument, NULL, 'D'},
{"dump-bpf", no_argument, NULL, 'B'},
{"silent", no_argument, NULL, 's'},
{"less", no_argument, NULL, 'q'},
{"hex", no_argument, NULL, 'X'},
{"ascii", no_argument, NULL, 'l'},
{"no-sock-mem", no_argument, NULL, 'A'},
{"verbose", no_argument, NULL, 'V'},
{"version", no_argument, NULL, 'v'},
{"help", no_argument, NULL, 'h'},
// these don't exist in netsniff-ng
{"ui", no_argument, NULL, 'Y'},
{"normal", no_argument, NULL, 'Z'},
{"local-net", required_argument, NULL, 'L'},
{"local-net-prefix", required_argument, NULL, 'W'},
{"geoip-city", required_argument, NULL, 'C'},
{"geoip-asn", required_argument, NULL, 'a'},
{NULL, 0, NULL, 0}
};
static const char *copyright = "Please report bugs to https://github.com/nsone\n"
"Copyright (C) 2015 NSONE, Inc. <dev@nsone.net>\n"
"Copyright (C) 2009-2013 Daniel Borkmann <dborkma@tik.ee.ethz.ch>\n"
"Copyright (C) 2009-2012 Emmanuel Roullit <emmanuel.roullit@gmail.com>\n"
"Copyright (C) 2012 Markus Amend <markus@netsniff-ng.org>\n"
"Swiss federal institute of technology (ETH Zurich)\n"
"License: GNU GPL version 2.0\n"
"This is free software: you are free to change and redistribute it.\n"
"There is NO WARRANTY, to the extent permitted by law.";
static int tx_sock;
static struct itimerval itimer;
static unsigned long frame_count_max = 0, interval = TX_KERNEL_PULL_INT;
#define __pcap_io pcap_ops[ctx->pcap]
static void signal_handler(int number)
{
switch (number) {
case SIGINT:
case SIGQUIT:
case SIGTERM:
sigint = 1;
case SIGHUP:
default:
break;
}
}
static void timer_elapsed(int unused __maybe_unused)
{
int ret;
set_itimer_interval_value(&itimer, 0, interval);
ret = pull_and_flush_tx_ring(tx_sock);
if (unlikely(ret < 0)) {
/* We could hit EBADF if the socket has been closed before
* the timer was triggered.
*/
if (errno != EBADF && errno != ENOBUFS)
panic("Flushing TX_RING failed: %s!\n", strerror(errno));
}
setitimer(ITIMER_REAL, &itimer, NULL);
}
static void timer_purge(void)
{
int ret;
ret = pull_and_flush_tx_ring_wait(tx_sock);
if (unlikely(ret < 0)) {
if (errno != EBADF && errno != ENOBUFS)
panic("Flushing TX_RING failed: %s!\n", strerror(errno));
}
set_itimer_interval_value(&itimer, 0, 0);
setitimer(ITIMER_REAL, &itimer, NULL);
}
static void timer_next_dump(int unused __maybe_unused)
{
set_itimer_interval_value(&itimer, interval, 0);
next_dump = true;
setitimer(ITIMER_REAL, &itimer, NULL);
}
static inline bool dump_to_pcap(struct ctx *ctx)
{
return ctx->dump;
}
static void pcap_to_xmit(struct ctx *ctx)
{
uint8_t *out = NULL;
int ifindex, fd = 0, ret;
size_t size;
unsigned int it = 0;
unsigned long trunced = 0;
struct ring tx_ring;
struct frame_map *hdr;
struct sock_fprog bpf_ops;
struct timeval start, end, diff;
pcap_pkthdr_t phdr;
if (!device_up_and_running(ctx->device_out) /*&& !ctx->rfraw*/)
panic("Device not up and running!\n");
bug_on(!__pcap_io);
tx_sock = pf_socket();
if (!strncmp("-", ctx->device_in, strlen("-"))) {
fd = dup_or_die(fileno(stdin));
close(fileno(stdin));
if (ctx->pcap == PCAP_OPS_MM)
ctx->pcap = PCAP_OPS_SG;
} else {
fd = open_or_die(ctx->device_in, O_RDONLY | O_LARGEFILE | O_NOATIME);
}
if (__pcap_io->init_once_pcap)
__pcap_io->init_once_pcap();
ret = __pcap_io->pull_fhdr_pcap(fd, &ctx->magic, &ctx->link_type);
if (ret)
panic("Error reading pcap header!\n");
if (__pcap_io->prepare_access_pcap) {
ret = __pcap_io->prepare_access_pcap(fd, PCAP_MODE_RD, ctx->jumbo);
if (ret)
panic("Error prepare reading pcap!\n");
}
/*
if (ctx->rfraw) {
ctx->device_trans = xstrdup(ctx->device_out);
xfree(ctx->device_out);
enter_rfmon_mac80211(ctx->device_trans, &ctx->device_out);
if (ctx->link_type != LINKTYPE_IEEE802_11)
panic("Wrong linktype of pcap!\n");
}
*/
ifindex = device_ifindex(ctx->device_out);
size = ring_size(ctx->device_out, ctx->reserve_size);
bpf_parse_rules(ctx->filter, &bpf_ops, ctx->link_type);
if (ctx->dump_bpf)
bpf_dump_all(&bpf_ops);
ring_tx_setup(&tx_ring, tx_sock, size, ifindex, ctx->jumbo, ctx->verbose);
dissector_init_all(ctx->print_mode);
if (ctx->cpu >= 0 && ifindex > 0) {
int irq = device_irq_number(ctx->device_out);
device_set_irq_affinity(irq, ctx->cpu);
if (ctx->verbose)
printf("IRQ: %s:%d > CPU%d\n",
ctx->device_out, irq, ctx->cpu);
}
if (ctx->kpull)
interval = ctx->kpull;
set_itimer_interval_value(&itimer, 0, interval);
setitimer(ITIMER_REAL, &itimer, NULL);
drop_privileges(ctx->enforce, ctx->uid, ctx->gid);
printf("Running! Hang up with ^C!\n\n");
fflush(stdout);
bug_on(gettimeofday(&start, NULL));
while (likely(sigint == 0)) {
while (user_may_pull_from_tx(tx_ring.frames[it].iov_base)) {
hdr = tx_ring.frames[it].iov_base;
out = ((uint8_t *) hdr) + TPACKET2_HDRLEN - sizeof(struct sockaddr_ll);
do {
ret = __pcap_io->read_pcap(fd, &phdr, ctx->magic, out,
ring_frame_size(&tx_ring));
if (unlikely(ret <= 0))
goto out;
if (ring_frame_size(&tx_ring) <
pcap_get_length(&phdr, ctx->magic)) {
pcap_set_length(&phdr, ctx->magic,
ring_frame_size(&tx_ring));
trunced++;
}
} while (ctx->filter &&
!bpf_run_filter(&bpf_ops, out,
pcap_get_length(&phdr, ctx->magic)));
pcap_pkthdr_to_tpacket_hdr(&phdr, ctx->magic, &hdr->tp_h, NULL);
ctx->tx_bytes += hdr->tp_h.tp_len;;
ctx->tx_packets++;
show_frame_hdr(out, hdr->tp_h.tp_snaplen,
ctx->link_type, hdr, ctx->print_mode);
dissector_entry_point(out, hdr->tp_h.tp_snaplen,
ctx->link_type, ctx->print_mode,
hdr->s_ll.sll_pkttype, &ctx->dns_ctxt);
kernel_may_pull_from_tx(&hdr->tp_h);
it++;
if (it >= tx_ring.layout.tp_frame_nr)
it = 0;
if (unlikely(sigint == 1))
break;
if (frame_count_max != 0) {
if (ctx->tx_packets >= frame_count_max) {
sigint = 1;
break;
}
}
}
}
out:
bug_on(gettimeofday(&end, NULL));
timersub(&end, &start, &diff);
timer_purge();
bpf_release(&bpf_ops);
dissector_cleanup_all();
destroy_tx_ring(tx_sock, &tx_ring);
/*
if (ctx->rfraw)
leave_rfmon_mac80211(ctx->device_out);
*/
if (__pcap_io->prepare_close_pcap)
__pcap_io->prepare_close_pcap(fd, PCAP_MODE_RD);
if (!strncmp("-", ctx->device_in, strlen("-")))
dup2(fd, fileno(stdin));
close(fd);
close(tx_sock);
fflush(stdout);
printf("\n");
printf("\r%12lu packets outgoing\n", ctx->tx_packets);
printf("\r%12lu packets truncated in file\n", trunced);
printf("\r%12lu bytes outgoing\n", ctx->tx_bytes);
printf("\r%12lu sec, %lu usec in total\n", diff.tv_sec, diff.tv_usec);
}
static void receive_to_xmit(struct ctx *ctx)
{
short ifflags = 0;
uint8_t *in, *out;
int rx_sock, ifindex_in, ifindex_out, ret;
size_t size_in, size_out;
unsigned int it_in = 0, it_out = 0;
unsigned long frame_count = 0;
struct frame_map *hdr_in, *hdr_out;
struct ring tx_ring, rx_ring;
struct pollfd rx_poll;
struct sock_fprog bpf_ops;
if (!strncmp(ctx->device_in, ctx->device_out, IFNAMSIZ))
panic("Ingress/egress devices must be different!\n");
if (!device_up_and_running(ctx->device_out))
panic("Egress device not up and running!\n");
rx_sock = pf_socket();
tx_sock = pf_socket();
ifindex_in = device_ifindex(ctx->device_in);
ifindex_out = device_ifindex(ctx->device_out);
size_in = ring_size(ctx->device_in, ctx->reserve_size);
size_out = ring_size(ctx->device_out, ctx->reserve_size);
enable_kernel_bpf_jit_compiler();
bpf_parse_rules(ctx->filter, &bpf_ops, ctx->link_type);
if (ctx->dump_bpf)
bpf_dump_all(&bpf_ops);
bpf_attach_to_sock(rx_sock, &bpf_ops);
ring_rx_setup(&rx_ring, rx_sock, size_in, ifindex_in, &rx_poll, false, ctx->jumbo, ctx->verbose);
ring_tx_setup(&tx_ring, tx_sock, size_out, ifindex_out, ctx->jumbo, ctx->verbose);
dissector_init_all(ctx->print_mode);
if (ctx->promiscuous)
ifflags = device_enter_promiscuous_mode(ctx->device_in);
if (ctx->kpull)
interval = ctx->kpull;
set_itimer_interval_value(&itimer, 0, interval);
setitimer(ITIMER_REAL, &itimer, NULL);
drop_privileges(ctx->enforce, ctx->uid, ctx->gid);
printf("Running! Hang up with ^C!\n\n");
fflush(stdout);
while (likely(sigint == 0)) {
while (user_may_pull_from_rx(rx_ring.frames[it_in].iov_base)) {
hdr_in = rx_ring.frames[it_in].iov_base;
in = ((uint8_t *) hdr_in) + hdr_in->tp_h.tp_mac;
frame_count++;
if (ctx->packet_type != -1)
if (ctx->packet_type != hdr_in->s_ll.sll_pkttype)
goto next;
hdr_out = tx_ring.frames[it_out].iov_base;
out = ((uint8_t *) hdr_out) + TPACKET2_HDRLEN - sizeof(struct sockaddr_ll);
while (!user_may_pull_from_tx(tx_ring.frames[it_out].iov_base) &&
likely(!sigint)) {
if (ctx->randomize)
next_rnd_slot(&it_out, &tx_ring);
else {
it_out++;
if (it_out >= tx_ring.layout.tp_frame_nr)
it_out = 0;
}
hdr_out = tx_ring.frames[it_out].iov_base;
out = ((uint8_t *) hdr_out) + TPACKET2_HDRLEN - sizeof(struct sockaddr_ll);
}
tpacket_hdr_clone(&hdr_out->tp_h, &hdr_in->tp_h);
fmemcpy(out, in, hdr_in->tp_h.tp_len);
kernel_may_pull_from_tx(&hdr_out->tp_h);
if (ctx->randomize)
next_rnd_slot(&it_out, &tx_ring);
else {
it_out++;
if (it_out >= tx_ring.layout.tp_frame_nr)
it_out = 0;
}
show_frame_hdr(in, hdr_in->tp_h.tp_snaplen,
ctx->link_type, hdr_in, ctx->print_mode);
dissector_entry_point(in, hdr_in->tp_h.tp_snaplen,
ctx->link_type, ctx->print_mode,
hdr_in->s_ll.sll_pkttype, &ctx->dns_ctxt);
if (frame_count_max != 0) {
if (frame_count >= frame_count_max) {
sigint = 1;
break;
}
}
next:
kernel_may_pull_from_rx(&hdr_in->tp_h);
it_in++;
if (it_in >= rx_ring.layout.tp_frame_nr)
it_in = 0;
if (unlikely(sigint == 1))
goto out;
}
ret = poll(&rx_poll, 1, -1);
if (unlikely(ret < 0)) {
if (errno != EINTR)
panic("Poll failed!\n");
}
}
out:
timer_purge();
sock_rx_net_stats(rx_sock, 0);
bpf_release(&bpf_ops);
dissector_cleanup_all();
destroy_tx_ring(tx_sock, &tx_ring);
destroy_rx_ring(rx_sock, &rx_ring);
if (ctx->promiscuous)
device_leave_promiscuous_mode(ctx->device_in, ifflags);
close(tx_sock);
close(rx_sock);
}
static void translate_pcap_to_txf(int fdo, uint8_t *out, size_t len)
{
size_t bytes_done = 0;
char bout[80];
slprintf(bout, sizeof(bout), "{\n ");
write_or_die(fdo, bout, strlen(bout));
while (bytes_done < len) {
slprintf(bout, sizeof(bout), "0x%02x, ", out[bytes_done]);
write_or_die(fdo, bout, strlen(bout));
bytes_done++;
if (bytes_done % 10 == 0) {
slprintf(bout, sizeof(bout), "\n");
write_or_die(fdo, bout, strlen(bout));
if (bytes_done < len) {
slprintf(bout, sizeof(bout), " ");
write_or_die(fdo, bout, strlen(bout));
}
}
}
if (bytes_done % 10 != 0) {
slprintf(bout, sizeof(bout), "\n");
write_or_die(fdo, bout, strlen(bout));
}
slprintf(bout, sizeof(bout), "}\n\n");
write_or_die(fdo, bout, strlen(bout));
}
static void dns_summary(struct ctx *ctx)
{
double outgoing = (double)ctx->dns_ctxt.seen - (double)ctx->dns_ctxt.incoming;
printf("\nDNS Results:\n");
printf("\r%12lu seen\n", ctx->dns_ctxt.seen);
printf("\r%12lu incoming\n", ctx->dns_ctxt.incoming);
printf("\r%12lu outgoing\n", (long)outgoing);
printf("\r%12lu malformed (%0.2f%%)\n",
ctx->dns_ctxt.cnt_malformed,
((double)ctx->dns_ctxt.cnt_malformed / (double)ctx->dns_ctxt.seen)*100);
printf("\r%12lu EDNS (%0.2f%%)\n\n",
ctx->dns_ctxt.cnt_edns,
((double)ctx->dns_ctxt.cnt_edns / (double)ctx->dns_ctxt.seen)*100);
printf("\r%12lu Query flag\n", ctx->dns_ctxt.cnt_query);
printf("\r%12lu Reply flag\n\n", ctx->dns_ctxt.cnt_reply);
printf("\r%12lu NOERROR (%0.2f%%)\n",
ctx->dns_ctxt.cnt_status_noerror,
((double)ctx->dns_ctxt.cnt_status_noerror / outgoing)*100);
printf("\r%12lu SRVFAIL (%0.2f%%)\n",
ctx->dns_ctxt.cnt_status_srvfail,
((double)ctx->dns_ctxt.cnt_status_srvfail / outgoing)*100);
printf("\r%12lu NXDOMAIN (%0.2f%%)\n",
ctx->dns_ctxt.cnt_status_nxdomain,
((double)ctx->dns_ctxt.cnt_status_nxdomain / outgoing)*100);
printf("\r%12lu REFUSED (%0.2f%%)\n",
ctx->dns_ctxt.cnt_status_refused,
((double)ctx->dns_ctxt.cnt_status_refused / outgoing)*100);
dnsctxt_table_summary(&ctx->dns_ctxt, 3);
}
static void read_pcap(struct ctx *ctx)
{
uint8_t *out;
int ret, fd, fdo = 0;
unsigned long trunced = 0;
size_t out_len;
pcap_pkthdr_t phdr;
struct sock_fprog bpf_ops;
struct frame_map fm;
struct timeval start, end, diff;
bug_on(!__pcap_io);
if (!strncmp("-", ctx->device_in, strlen("-"))) {
fd = dup_or_die(fileno(stdin));
close(fileno(stdin));
if (ctx->pcap == PCAP_OPS_MM)
ctx->pcap = PCAP_OPS_SG;
} else {
fd = open_or_die(ctx->device_in, O_RDONLY | O_LARGEFILE | O_NOATIME);
}
if (__pcap_io->init_once_pcap)
__pcap_io->init_once_pcap();
ret = __pcap_io->pull_fhdr_pcap(fd, &ctx->magic, &ctx->link_type);
if (ret)
panic("Error reading pcap header!\n");
if (__pcap_io->prepare_access_pcap) {
ret = __pcap_io->prepare_access_pcap(fd, PCAP_MODE_RD, ctx->jumbo);
if (ret)
panic("Error prepare reading pcap!\n");
}
fmemset(&fm, 0, sizeof(fm));
bpf_parse_rules(ctx->filter, &bpf_ops, ctx->link_type);
if (ctx->dump_bpf)
bpf_dump_all(&bpf_ops);
dissector_init_all(ctx->print_mode);
out_len = round_up(1024 * 1024, RUNTIME_PAGE_SIZE);
out = xmalloc_aligned(out_len, CO_CACHE_LINE_SIZE);
if (ctx->device_out) {
if (!strncmp("-", ctx->device_out, strlen("-"))) {
fdo = dup_or_die(fileno(stdout));
close(fileno(stdout));
} else {
fdo = open_or_die_m(ctx->device_out, O_RDWR | O_CREAT |
O_TRUNC | O_LARGEFILE, DEFFILEMODE);
}
}
drop_privileges(ctx->enforce, ctx->uid, ctx->gid);
if (!ctx->ui) {
printf("Running! Local network: %s/%d. Hang up with ^C!\n\n", ctx->local_net, ctx->local_prefix);
fflush(stdout);
}
else {
pktvisor_ui(&ctx->dns_ctxt);
}
bug_on(gettimeofday(&start, NULL));
while (likely(sigint == 0)) {
do {
ret = __pcap_io->read_pcap(fd, &phdr, ctx->magic,
out, out_len);
if (unlikely(ret < 0))
goto out;
if (unlikely(pcap_get_length(&phdr, ctx->magic) == 0)) {
trunced++;
continue;
}
if (unlikely(pcap_get_length(&phdr, ctx->magic) > out_len)) {
pcap_set_length(&phdr, ctx->magic, out_len);
trunced++;
}
} while (ctx->filter &&
!bpf_run_filter(&bpf_ops, out,
pcap_get_length(&phdr, ctx->magic)));
pcap_pkthdr_to_tpacket_hdr(&phdr, ctx->magic, &fm.tp_h, &fm.s_ll);
ctx->tx_bytes += fm.tp_h.tp_len;
ctx->tx_packets++;
show_frame_hdr(out, fm.tp_h.tp_snaplen, ctx->link_type, &fm,
ctx->print_mode);
dissector_entry_point(out, fm.tp_h.tp_snaplen,
ctx->link_type, ctx->print_mode,
fm.s_ll.sll_pkttype, &ctx->dns_ctxt);
if (ctx->ui)
pktvisor_ui(&ctx->dns_ctxt);
if (ctx->device_out)
translate_pcap_to_txf(fdo, out, fm.tp_h.tp_snaplen);
if (frame_count_max != 0) {
if (ctx->tx_packets >= frame_count_max) {
sigint = 1;
break;
}
}
}
out:
bug_on(gettimeofday(&end, NULL));
timersub(&end, &start, &diff);
bpf_release(&bpf_ops);
dissector_cleanup_all();
if (__pcap_io->prepare_close_pcap)
__pcap_io->prepare_close_pcap(fd, PCAP_MODE_RD);
xfree(out);
if (!ctx->ui) {
fflush(stdout);
printf("\n");
printf("\r%12lu packets seen\n", ctx->tx_packets);
printf("\r%12lu packets truncated in file\n", trunced);
printf("\r%12lu bytes seen\n", ctx->tx_bytes);
printf("\r%12lu sec, %lu usec in total\n", diff.tv_sec, diff.tv_usec);
dns_summary(ctx);
}
else {
pktvisor_ui_waitforkey(&ctx->dns_ctxt);
}
if (!strncmp("-", ctx->device_in, strlen("-")))
dup2(fd, fileno(stdin));
close(fd);
if (ctx->device_out) {
if (!strncmp("-", ctx->device_out, strlen("-")))
dup2(fdo, fileno(stdout));
close(fdo);
}
}
static void finish_multi_pcap_file(struct ctx *ctx, int fd)
{
__pcap_io->fsync_pcap(fd);
if (__pcap_io->prepare_close_pcap)
__pcap_io->prepare_close_pcap(fd, PCAP_MODE_WR);
close(fd);
fmemset(&itimer, 0, sizeof(itimer));
setitimer(ITIMER_REAL, &itimer, NULL);
}
static int next_multi_pcap_file(struct ctx *ctx, int fd)
{
int ret;
char fname[512];
__pcap_io->fsync_pcap(fd);
if (__pcap_io->prepare_close_pcap)
__pcap_io->prepare_close_pcap(fd, PCAP_MODE_WR);
close(fd);
slprintf(fname, sizeof(fname), "%s/%s%lu.pcap", ctx->device_out,
ctx->prefix ? : "dump-", time(NULL));
fd = open_or_die_m(fname, O_RDWR | O_CREAT | O_TRUNC |
O_LARGEFILE, DEFFILEMODE);
ret = __pcap_io->push_fhdr_pcap(fd, ctx->magic, ctx->link_type);
if (ret)
panic("Error writing pcap header!\n");
if (__pcap_io->prepare_access_pcap) {
ret = __pcap_io->prepare_access_pcap(fd, PCAP_MODE_WR, true);
if (ret)
panic("Error prepare writing pcap!\n");
}
return fd;
}
static int begin_multi_pcap_file(struct ctx *ctx)
{
int fd, ret;
char fname[256];
bug_on(!__pcap_io);
if (ctx->device_out[strlen(ctx->device_out) - 1] == '/')
ctx->device_out[strlen(ctx->device_out) - 1] = 0;
slprintf(fname, sizeof(fname), "%s/%s%lu.pcap", ctx->device_out,
ctx->prefix ? : "dump-", time(NULL));
fd = open_or_die_m(fname, O_RDWR | O_CREAT | O_TRUNC |
O_LARGEFILE, DEFFILEMODE);
ret = __pcap_io->push_fhdr_pcap(fd, ctx->magic, ctx->link_type);
if (ret)
panic("Error writing pcap header!\n");
if (__pcap_io->prepare_access_pcap) {
ret = __pcap_io->prepare_access_pcap(fd, PCAP_MODE_WR, true);
if (ret)
panic("Error prepare writing pcap!\n");
}
if (ctx->dump_mode == DUMP_INTERVAL_TIME) {
interval = ctx->dump_interval;
set_itimer_interval_value(&itimer, interval, 0);
setitimer(ITIMER_REAL, &itimer, NULL);
} else {
interval = 0;
}
return fd;
}
static void finish_single_pcap_file(struct ctx *ctx, int fd)
{
__pcap_io->fsync_pcap(fd);
if (__pcap_io->prepare_close_pcap)
__pcap_io->prepare_close_pcap(fd, PCAP_MODE_WR);
if (strncmp("-", ctx->device_out, strlen("-")))
close(fd);
else
dup2(fd, fileno(stdout));
}
static int begin_single_pcap_file(struct ctx *ctx)
{
int fd, ret;
bug_on(!__pcap_io);
if (!strncmp("-", ctx->device_out, strlen("-"))) {
fd = dup_or_die(fileno(stdout));
close(fileno(stdout));
if (ctx->pcap == PCAP_OPS_MM)
ctx->pcap = PCAP_OPS_SG;
} else {
fd = open_or_die_m(ctx->device_out,
O_RDWR | O_CREAT | O_TRUNC |
O_LARGEFILE, DEFFILEMODE);
}
ret = __pcap_io->push_fhdr_pcap(fd, ctx->magic, ctx->link_type);
if (ret)
panic("Error writing pcap header!\n");
if (__pcap_io->prepare_access_pcap) {
ret = __pcap_io->prepare_access_pcap(fd, PCAP_MODE_WR, true);
if (ret)
panic("Error prepare writing pcap!\n");
}
return fd;
}
static void print_pcap_file_stats(int sock, struct ctx *ctx)
{
int ret;
struct tpacket_stats kstats;
socklen_t slen = sizeof(kstats);
fmemset(&kstats, 0, sizeof(kstats));
ret = getsockopt(sock, SOL_PACKET, PACKET_STATISTICS, &kstats, &slen);
if (unlikely(ret))
panic("Cannot get packet statistics!\n");
if (ctx->print_mode == PRINT_NONE) {
printf(".(+%u/-%u)", kstats.tp_packets - kstats.tp_drops,
kstats.tp_drops);
fflush(stdout);
}
}
static void update_pcap_next_dump(struct ctx *ctx, unsigned long snaplen, int *fd, int sock)
{
if (!dump_to_pcap(ctx))
return;
if (ctx->dump_mode == DUMP_INTERVAL_SIZE) {
interval += snaplen;
if (interval > ctx->dump_interval) {
next_dump = true;
interval = 0;
}
}
if (next_dump) {
*fd = next_multi_pcap_file(ctx, *fd);
next_dump = false;
if (ctx->verbose)
print_pcap_file_stats(sock, ctx);
}
}
#ifdef HAVE_TPACKET3
static void walk_t3_block(struct block_desc *pbd, struct ctx *ctx,
int sock, int *fd, unsigned long *frame_count)
{
int num_pkts = pbd->h1.num_pkts, i;
struct tpacket3_hdr *hdr;
struct sockaddr_ll *sll;
hdr = (void *) ((uint8_t *) pbd + pbd->h1.offset_to_first_pkt);
sll = (void *) ((uint8_t *) hdr + TPACKET_ALIGN(sizeof(*hdr)));
for (i = 0; i < num_pkts && likely(sigint == 0); ++i) {
uint8_t *packet = ((uint8_t *) hdr + hdr->tp_mac);
pcap_pkthdr_t phdr;
if (ctx->packet_type != -1)
if (ctx->packet_type != sll->sll_pkttype)
goto next;
(*frame_count)++;
if (dump_to_pcap(ctx)) {
int ret;
tpacket3_hdr_to_pcap_pkthdr(hdr, sll, &phdr, ctx->magic);
ret = __pcap_io->write_pcap(*fd, &phdr, ctx->magic, packet,
pcap_get_length(&phdr, ctx->magic));
if (unlikely(ret != (int) pcap_get_total_length(&phdr, ctx->magic)))
panic("Write error to pcap!\n");
}
__show_frame_hdr(packet, hdr->tp_snaplen, ctx->link_type, sll,
hdr, ctx->print_mode, true);
dissector_entry_point(packet, hdr->tp_snaplen, ctx->link_type,
ctx->print_mode, sll->sll_pkttype, &ctx->dns_ctxt);
next:
hdr = (void *) ((uint8_t *) hdr + hdr->tp_next_offset);
sll = (void *) ((uint8_t *) hdr + TPACKET_ALIGN(sizeof(*hdr)));
if (frame_count_max != 0) {
if (unlikely(*frame_count >= frame_count_max)) {
sigint = 1;
break;
}
}
update_pcap_next_dump(ctx, hdr->tp_snaplen, fd, sock);
}
}
#endif /* HAVE_TPACKET3 */
static void recv_only_or_dump(struct ctx *ctx)
{
short ifflags = 0;
int sock, ifindex, fd = 0, ret;
size_t size;
unsigned int it = 0;
struct ring rx_ring;
struct pollfd rx_poll;
struct sock_fprog bpf_ops;
struct timeval start, end, diff;
unsigned long frame_count = 0;
sock = pf_socket();
/*
if (ctx->rfraw) {
ctx->device_trans = xstrdup(ctx->device_in);
xfree(ctx->device_in);
enter_rfmon_mac80211(ctx->device_trans, &ctx->device_in);
ctx->link_type = LINKTYPE_IEEE802_11;
}
*/
ifindex = device_ifindex(ctx->device_in);
size = ring_size(ctx->device_in, ctx->reserve_size);
enable_kernel_bpf_jit_compiler();
bpf_parse_rules(ctx->filter, &bpf_ops, ctx->link_type);
if (ctx->dump_bpf)
bpf_dump_all(&bpf_ops);
bpf_attach_to_sock(sock, &bpf_ops);
if (ctx->hwtimestamp) {
ret = set_sockopt_hwtimestamp(sock, ctx->device_in);
if (ret == 0 && ctx->verbose)
printf("HW timestamping enabled\n");
}
ring_rx_setup(&rx_ring, sock, size, ifindex, &rx_poll, is_defined(HAVE_TPACKET3), true, ctx->verbose);
dissector_init_all(ctx->print_mode);
if (ctx->cpu >= 0 && ifindex > 0) {
int irq = device_irq_number(ctx->device_in);
device_set_irq_affinity(irq, ctx->cpu);
if (ctx->verbose)
printf("IRQ: %s:%d > CPU%d\n",