/* * netsniff-ng - the packet sniffing beast * 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 "ring_rx.h" #include "ring_tx.h" #include "mac80211.h" #include "xutils.h" #include "built_in.h" #include "pcap_io.h" #include "bpf.h" #include "xio.h" #include "die.h" #include "geoip.h" #include "tprintf.h" #include "dissector.h" #include "xmalloc.h" enum dump_mode { DUMP_INTERVAL_TIME, DUMP_INTERVAL_SIZE, }; struct ctx { char *device_in, *device_out, *device_trans, *filter, *prefix; int cpu, rfraw, dump, print_mode, dump_dir, packet_type, verbose; unsigned long kpull, dump_interval, reserve_size, tx_bytes, tx_packets; bool randomize, promiscuous, enforce, jumbo, dump_bpf; enum pcap_ops_groups pcap; enum dump_mode dump_mode; uid_t uid; gid_t gid; uint32_t link_type, magic; }; volatile sig_atomic_t sigint = 0; static volatile bool next_dump = false; static const char *short_options = "d:i:o:rf:MJt:S:k:n:b:HQmcsqXlvhF:RGAP:Vu:g:T:DB"; 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'}, {"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'}, {"update", no_argument, NULL, 'U'}, {"verbose", no_argument, NULL, 'V'}, {"version", no_argument, NULL, 'v'}, {"help", no_argument, NULL, 'h'}, {NULL, 0, NULL, 0} }; 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: sigint = 1; case SIGHUP: default: break; } } static void timer_elapsed(int 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_next_dump(int 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) { __label__ out; uint8_t *out = NULL; int irq, ifindex, fd = 0, ret; unsigned int size, 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(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); } 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(&tx_ring, 0, sizeof(tx_ring)); fmemset(&bpf_ops, 0, sizeof(bpf_ops)); 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); set_packet_loss_discard(tx_sock); set_sockopt_hwtimestamp(tx_sock, ctx->device_out); setup_tx_ring_layout(tx_sock, &tx_ring, size, ctx->jumbo); create_tx_ring(tx_sock, &tx_ring, ctx->verbose); mmap_tx_ring(tx_sock, &tx_ring); alloc_tx_ring_frames(&tx_ring); bind_tx_ring(tx_sock, &tx_ring, ifindex); dissector_init_all(ctx->print_mode); if (ctx->cpu >= 0 && ifindex > 0) { irq = device_irq_number(ctx->device_out); device_bind_irq_to_cpu(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, &hdr->s_ll); ctx->tx_bytes += hdr->tp_h.tp_len;; ctx->tx_packets++; show_frame_hdr(hdr, ctx->print_mode); dissector_entry_point(out, hdr->tp_h.tp_snaplen, ctx->link_type, ctx->print_mode); 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); bpf_release(&bpf_ops); dissector_cleanup_all(); destroy_tx_ring(tx_sock, &tx_ring); if (ctx->rfraw) leave_rfmon_mac80211(ctx->device_trans, 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; unsigned int size_in, size_out, 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"); if (!device_up_and_running(ctx->device_in)) panic("Ingress device not up and running!\n"); rx_sock = pf_socket(); tx_sock = pf_socket(); fmemset(&tx_ring, 0, sizeof(tx_ring)); fmemset(&rx_ring, 0, sizeof(rx_ring)); fmemset(&rx_poll, 0, sizeof(rx_poll)); fmemset(&bpf_ops, 0, sizeof(bpf_ops)); 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); setup_rx_ring_layout(rx_sock, &rx_ring, size_in, ctx->jumbo); create_rx_ring(rx_sock, &rx_ring, ctx->verbose); mmap_rx_ring(rx_sock, &rx_ring); alloc_rx_ring_frames(&rx_ring); bind_rx_ring(rx_sock, &rx_ring, ifindex_in); prepare_polling(rx_sock, &rx_poll); set_packet_loss_discard(tx_sock); setup_tx_ring_layout(tx_sock, &tx_ring, size_out, ctx->jumbo); create_tx_ring(tx_sock, &tx_ring, ctx->verbose); mmap_tx_ring(tx_sock, &tx_ring); alloc_tx_ring_frames(&tx_ring); bind_tx_ring(tx_sock, &tx_ring, ifindex_out); dissector_init_all(ctx->print_mode); if (ctx->promiscuous) ifflags = 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)) { __label__ next; 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); for (; !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(hdr_in, ctx->print_mode); dissector_entry_point(in, hdr_in->tp_h.tp_snaplen, ctx->link_type, ctx->print_mode); 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; } poll(&rx_poll, 1, -1); } out: sock_print_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) 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 read_pcap(struct ctx *ctx) { __label__ out; 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; struct sockaddr_ll sll; bug_on(!__pcap_io); if (!strncmp("-", ctx->device_in, strlen("-"))) { fd = dup(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); } 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)); fmemset(&bpf_ops, 0, sizeof(bpf_ops)); 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, PAGE_SIZE); out = xmalloc_aligned(out_len, CO_CACHE_LINE_SIZE); if (ctx->device_out) { if (!strncmp("-", ctx->device_out, strlen("-"))) { fdo = dup(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); printf("Running! Hang up with ^C!\n\n"); fflush(stdout); 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, &sll); ctx->tx_bytes += fm.tp_h.tp_len; ctx->tx_packets++; show_frame_hdr(&fm, ctx->print_mode); dissector_entry_point(out, fm.tp_h.tp_snaplen, ctx->link_type, ctx->print_mode); 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); 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); 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(0)); 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, ctx->jumbo); 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(0)); 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, ctx->jumbo); 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(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, ctx->jumbo); if (ret) panic("Error prepare writing pcap!\n"); } return fd; } static void print_pcap_file_stats(int sock, struct ctx *ctx, unsigned long skipped) { int ret; unsigned long good, bad; 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) { good = kstats.tp_packets - kstats.tp_drops - skipped; bad = kstats.tp_drops + skipped; printf(".(+%lu/-%lu)", good, bad); fflush(stdout); } } static void recv_only_or_dump(struct ctx *ctx) { uint8_t *packet; short ifflags = 0; int sock, irq, ifindex, fd = 0, ret; unsigned int size, it = 0; unsigned long frame_count = 0, skipped = 0; struct ring rx_ring; struct pollfd rx_poll; 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_in) && !ctx->rfraw) panic("Device not up and running!\n"); 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; } fmemset(&rx_ring, 0, sizeof(rx_ring)); fmemset(&rx_poll, 0, sizeof(rx_poll)); fmemset(&bpf_ops, 0, sizeof(bpf_ops)); 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); set_sockopt_hwtimestamp(sock, ctx->device_in); setup_rx_ring_layout(sock, &rx_ring, size, ctx->jumbo); create_rx_ring(sock, &rx_ring, ctx->verbose); mmap_rx_ring(sock, &rx_ring); alloc_rx_ring_frames(&rx_ring); bind_rx_ring(sock, &rx_ring, ifindex); prepare_polling(sock, &rx_poll); dissector_init_all(ctx->print_mode); if (ctx->cpu >= 0 && ifindex > 0) { irq = device_irq_number(ctx->device_in); device_bind_irq_to_cpu(irq, ctx->cpu); if (ctx->verbose) printf("IRQ: %s:%d > CPU%d\n", ctx->device_in, irq, ctx->cpu); } if (ctx->promiscuous) ifflags = enter_promiscuous_mode(ctx->device_in); drop_privileges(ctx->enforce, ctx->uid, ctx->gid); if (dump_to_pcap(ctx)) { __label__ try_file; struct stat stats; fmemset(&stats, 0, sizeof(stats)); ret = stat(ctx->device_out, &stats); if (ret < 0) { ctx->dump_dir = 0; goto try_file; } ctx->dump_dir = S_ISDIR(stats.st_mode); if (ctx->dump_dir) { fd = begin_multi_pcap_file(ctx); } else { try_file: fd = begin_single_pcap_file(ctx); } } printf("Running! Hang up with ^C!\n\n"); fflush(stdout); bug_on(gettimeofday(&start, NULL)); while (likely(sigint == 0)) { while (user_may_pull_from_rx(rx_ring.frames[it].iov_base)) { __label__ next; hdr = rx_ring.frames[it].iov_base; packet = ((uint8_t *) hdr) + hdr->tp_h.tp_mac; frame_count++; if (ctx->packet_type != -1) if (ctx->packet_type != hdr->s_ll.sll_pkttype) goto next; if (unlikely(ring_frame_size(&rx_ring) < hdr->tp_h.tp_snaplen)) { skipped++; goto next; } if (dump_to_pcap(ctx)) { tpacket_hdr_to_pcap_pkthdr(&hdr->tp_h, &hdr->s_ll, &phdr, ctx->magic); ret = __pcap_io->write_pcap(fd, &phdr, ctx->magic, packet, pcap_get_length(&phdr, ctx->magic)); if (unlikely(ret != pcap_get_total_length(&phdr, ctx->magic))) panic("Write error to pcap!\n"); } show_frame_hdr(hdr, ctx->print_mode); dissector_entry_point(packet, hdr->tp_h.tp_snaplen, ctx->link_type, ctx->print_mode); if (frame_count_max != 0) { if (frame_count >= frame_count_max) { sigint = 1; break; } } next: kernel_may_pull_from_rx(&hdr->tp_h); it++; if (it >= rx_ring.layout.tp_frame_nr) it = 0; if (unlikely(sigint == 1)) break; if (dump_to_pcap(ctx)) { if (ctx->dump_mode == DUMP_INTERVAL_SIZE) { interval += hdr->tp_h.tp_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, skipped); } } } poll(&rx_poll, 1, -1); } bug_on(gettimeofday(&end, NULL)); timersub(&end, &start, &diff); if (!(ctx->dump_dir && ctx->print_mode == PRINT_NONE)) { sock_print_net_stats(sock, skipped); printf("\r%12lu sec, %lu usec in total\n", diff.tv_sec, diff.tv_usec); } else { printf("\n\n"); fflush(stdout); } bpf_release(&bpf_ops); dissector_cleanup_all(); destroy_rx_ring(sock, &rx_ring); if (ctx->promiscuous) leave_promiscuous_mode(ctx->device_in, ifflags); if (ctx->rfraw) leave_rfmon_mac80211(ctx->device_trans, ctx->device_in); if (dump_to_pcap(ctx)) { if (ctx->dump_dir) finish_multi_pcap_file(ctx, fd); else finish_single_pcap_file(ctx, fd); } close(sock); } static void help(void) { printf("\nnetsniff-ng %s, the packet sniffing beast\n", VERSION_STRING); puts("http://www.netsniff-ng.org\n\n" "Usage: netsniff-ng [options] [filter-expression]\n" "Options:\n" " -i|-d|--dev|--in <dev|pcap|-> Input source as netdev, pcap or pcap stdin\n" " -o|--out <dev|pcap|dir|cfg|-> Output sink as netdev, pcap, directory, trafgen, or stdout\n" " -f|--filter <bpf-file|expr> Use BPF filter file from bpfc or tcpdump-like expression\n" " -t|--type <type> Filter for: host|broadcast|multicast|others|outgoing\n" " -F|--interval <size|time> Dump interval if -o is a dir: <num>KiB/MiB/GiB/s/sec/min/hrs\n" " -J|--jumbo-support Support for 64KB Super Jumbo Frames (def: 2048B)\n" " -R|--rfraw Capture or inject raw 802.11 frames\n" " -n|--num <0|uint> Number of packets until exit (def: 0)\n" " -P|--prefix <name> Prefix for pcaps stored in directory\n" " -T|--magic <pcap-magic> Pcap magic number/pcap format to store, see -D\n" " -D|--dump-pcap-types Dump pcap types and magic numbers and quit\n" " -B|--dump-bpf Dump generated BPF assembly\n" " -r|--rand Randomize packet forwarding order (dev->dev)\n" " -M|--no-promisc No promiscuous mode for netdev\n" " -A|--no-sock-mem Don't tune core socket memory\n" " -m|--mmap Mmap(2) pcap file i.e., for replaying pcaps\n" " -G|--sg Scatter/gather pcap file I/O\n" " -c|--clrw Use slower read(2)/write(2) I/O\n" " -S|--ring-size <size> Specify ring size to: <num>KiB/MiB/GiB\n" " -k|--kernel-pull <uint> Kernel pull from user interval in us (def: 10us)\n" " -b|--bind-cpu <cpu> Bind to specific CPU\n" " -u|--user <userid> Drop privileges and change to userid\n" " -g|--group <groupid> Drop privileges and change to groupid\n" " -H|--prio-high Make this high priority process\n" " -Q|--notouch-irq Do not touch IRQ CPU affinity of NIC\n" " -s|--silent Do not print captured packets\n" " -q|--less Print less-verbose packet information\n" " -X|--hex Print packet data in hex format\n" " -l|--ascii Print human-readable packet data\n" " -U|--update Update GeoIP databases\n" " -V|--verbose Be more verbose\n" " -v|--version Show version\n" " -h|--help Guess what?!\n\n" "Examples:\n" " netsniff-ng --in eth0 --out dump.pcap -s -T 0xa1b2c3d4 --b 0 tcp or udp\n" " netsniff-ng --in wlan0 --rfraw --out dump.pcap --silent --bind-cpu 0\n" " netsniff-ng --in dump.pcap --mmap --out eth0 -k1000 --silent --bind-cpu 0\n" " netsniff-ng --in dump.pcap --out dump.cfg --silent --bind-cpu 0\n" " netsniff-ng --in eth0 --out eth1 --silent --bind-cpu 0 --type host\n" " netsniff-ng --in eth1 --out /opt/probe/ -s -m -J --interval 100MiB -b 0\n" " netsniff-ng --in vlan0 --out dump.pcap -c -u `id -u bob` -g `id -g bob`\n" " netsniff-ng --in any --filter http.bpf --jumbo-support --ascii -V\n\n" "Note:\n" " For introducing bit errors, delays with random variation and more\n" " while replaying pcaps, make use of tc(8) with its disciplines (e.g. netem).\n\n" "Please report bugs to <bugs@netsniff-ng.org>\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.\n"); die(); } static void version(void) { printf("\nnetsniff-ng %s, the packet sniffing beast\n", VERSION_STRING); puts("http://www.netsniff-ng.org\n\n" "Please report bugs to <bugs@netsniff-ng.org>\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.\n"); die(); } int main(int argc, char **argv) { char *ptr; int c, i, j, cpu_tmp, opt_index, ops_touched = 0, vals[4] = {0}; bool prio_high = false, setsockmem = true; void (*main_loop)(struct ctx *ctx) = NULL; struct ctx ctx = { .link_type = LINKTYPE_EN10MB, .print_mode = PRINT_NORM, .cpu = -1, .packet_type = -1, .promiscuous = true, .randomize = false, .pcap = PCAP_OPS_SG, .dump_interval = 60, .dump_mode = DUMP_INTERVAL_TIME, .uid = getuid(), .gid = getgid(), .magic = ORIGINAL_TCPDUMP_MAGIC, }; srand(time(NULL)); while ((c = getopt_long(argc, argv, short_options, long_options, &opt_index)) != EOF) { switch (c) { case 'd': case 'i': ctx.device_in = xstrdup(optarg); break; case 'o': ctx.device_out = xstrdup(optarg); break; case 'P': ctx.prefix = xstrdup(optarg); break; case 'R': ctx.link_type = LINKTYPE_IEEE802_11; ctx.rfraw = 1; break; case 'r': ctx.randomize = true; break; case 'J': ctx.jumbo = true; break; case 'T': ctx.magic = (uint32_t) strtoul(optarg, NULL, 0); pcap_check_magic(ctx.magic); break; case 'f': ctx.filter = xstrdup(optarg); break; case 'M': ctx.promiscuous = false; break; case 'A': setsockmem = false; break; case 'u': ctx.uid = strtoul(optarg, NULL, 0); ctx.enforce = true; break; case 'g': ctx.gid = strtoul(optarg, NULL, 0); ctx.enforce = true; break; case 't': if (!strncmp(optarg, "host", strlen("host"))) ctx.packet_type = PACKET_HOST; else if (!strncmp(optarg, "broadcast", strlen("broadcast"))) ctx.packet_type = PACKET_BROADCAST; else if (!strncmp(optarg, "multicast", strlen("multicast"))) ctx.packet_type = PACKET_MULTICAST; else if (!strncmp(optarg, "others", strlen("others"))) ctx.packet_type = PACKET_OTHERHOST; else if (!strncmp(optarg, "outgoing", strlen("outgoing"))) ctx.packet_type = PACKET_OUTGOING; else ctx.packet_type = -1; break; case 'S': ptr = optarg; ctx.reserve_size = 0; for (j = i = strlen(optarg); i > 0; --i) { if (!isdigit(optarg[j - i])) break; ptr++; } if (!strncmp(ptr, "KiB", strlen("KiB"))) ctx.reserve_size = 1 << 10; else if (!strncmp(ptr, "MiB", strlen("MiB"))) ctx.reserve_size = 1 << 20; else if (!strncmp(ptr, "GiB", strlen("GiB"))) ctx.reserve_size = 1 << 30; else panic("Syntax error in ring size param!\n"); *ptr = 0; ctx.reserve_size *= strtol(optarg, NULL, 0); break; case 'b': cpu_tmp = strtol(optarg, NULL, 0); cpu_affinity(cpu_tmp); if (ctx.cpu != -2) ctx.cpu = cpu_tmp; break; case 'H': prio_high = true; break; case 'c': ctx.pcap = PCAP_OPS_RW; ops_touched = 1; break; case 'm': ctx.pcap = PCAP_OPS_MM; ops_touched = 1; break; case 'G': ctx.pcap = PCAP_OPS_SG; ops_touched = 1; break; case 'Q': ctx.cpu = -2; break; case 's': ctx.print_mode = PRINT_NONE; break; case 'q': ctx.print_mode = PRINT_LESS; break; case 'X': ctx.print_mode = (ctx.print_mode == PRINT_ASCII) ? PRINT_HEX_ASCII : PRINT_HEX; break; case 'l': ctx.print_mode = (ctx.print_mode == PRINT_HEX) ? PRINT_HEX_ASCII : PRINT_ASCII; break; case 'k': ctx.kpull = strtol(optarg, NULL, 0); break; case 'n': frame_count_max = strtol(optarg, NULL, 0); break; case 'F': ptr = optarg; ctx.dump_interval = 0; for (j = i = strlen(optarg); i > 0; --i) { if (!isdigit(optarg[j - i])) break; ptr++; } if (!strncmp(ptr, "KiB", strlen("KiB"))) { ctx.dump_interval = 1 << 10; ctx.dump_mode = DUMP_INTERVAL_SIZE; } else if (!strncmp(ptr, "MiB", strlen("MiB"))) { ctx.dump_interval = 1 << 20; ctx.dump_mode = DUMP_INTERVAL_SIZE; } else if (!strncmp(ptr, "GiB", strlen("GiB"))) { ctx.dump_interval = 1 << 30; ctx.dump_mode = DUMP_INTERVAL_SIZE; } else if (!strncmp(ptr, "sec", strlen("sec"))) { ctx.dump_interval = 1; ctx.dump_mode = DUMP_INTERVAL_TIME; } else if (!strncmp(ptr, "min", strlen("min"))) { ctx.dump_interval = 60; ctx.dump_mode = DUMP_INTERVAL_TIME; } else if (!strncmp(ptr, "hrs", strlen("hrs"))) { ctx.dump_interval = 60 * 60; ctx.dump_mode = DUMP_INTERVAL_TIME; } else if (!strncmp(ptr, "s", strlen("s"))) { ctx.dump_interval = 1; ctx.dump_mode = DUMP_INTERVAL_TIME; } else { panic("Syntax error in time/size param!\n"); } *ptr = 0; ctx.dump_interval *= strtol(optarg, NULL, 0); break; case 'V': ctx.verbose = 1; break; case 'B': ctx.dump_bpf = true; break; case 'D': pcap_dump_type_features(); die(); break; case 'U': update_geoip(); die(); break; case 'v': version(); break; case 'h': help(); break; case '?': switch (optopt) { case 'd': case 'i': case 'o': case 'f': case 't': case 'P': case 'F': case 'n': case 'S': case 'b': case 'k': case 'T': case 'u': case 'g': case 'e': panic("Option -%c requires an argument!\n", optopt); default: if (isprint(optopt)) printf("Unknown option character `0x%X\'!\n", optopt); die(); } default: break; } } if (!ctx.filter && optind != argc) { int ret; off_t offset = 0; for (i = optind; i < argc; ++i) { size_t alen = strlen(argv[i]) + 2; size_t flen = ctx.filter ? strlen(ctx.filter) : 0; ctx.filter = xrealloc(ctx.filter, 1, flen + alen); ret = slprintf(ctx.filter + offset, strlen(argv[i]) + 2, "%s ", argv[i]); if (ret < 0) panic("Cannot concatenate filter string!\n"); else offset += ret; } } if (!ctx.device_in) ctx.device_in = xstrdup("any"); register_signal(SIGINT, signal_handler); register_signal(SIGHUP, signal_handler); tprintf_init(); if (prio_high) { set_proc_prio(get_default_proc_prio()); set_sched_status(get_default_sched_policy(), get_default_sched_prio()); } if (ctx.device_in && (device_mtu(ctx.device_in) || !strncmp("any", ctx.device_in, strlen(ctx.device_in)))) { if (!ctx.device_out) { ctx.dump = 0; main_loop = recv_only_or_dump; } else if (device_mtu(ctx.device_out)) { register_signal_f(SIGALRM, timer_elapsed, SA_SIGINFO); main_loop = receive_to_xmit; } else { ctx.dump = 1; register_signal_f(SIGALRM, timer_next_dump, SA_SIGINFO); main_loop = recv_only_or_dump; if (!ops_touched) ctx.pcap = PCAP_OPS_SG; } } else { if (ctx.device_out && device_mtu(ctx.device_out)) { register_signal_f(SIGALRM, timer_elapsed, SA_SIGINFO); main_loop = pcap_to_xmit; if (!ops_touched) ctx.pcap = PCAP_OPS_MM; } else { main_loop = read_pcap; if (!ops_touched) ctx.pcap = PCAP_OPS_SG; } } bug_on(!main_loop); init_geoip(0); if (setsockmem) set_system_socket_memory(vals, array_size(vals)); xlockme(); main_loop(&ctx); xunlockme(); if (setsockmem) reset_system_socket_memory(vals, array_size(vals)); destroy_geoip(); tprintf_cleanup(); free(ctx.device_in); free(ctx.device_out); free(ctx.device_trans); free(ctx.prefix); return 0; }