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
|
#define _GNU_SOURCE
#include <sys/socket.h>
#include <netinet/in.h>
#include <netinet/ip6.h>
#include <netinet/udp.h>
#include <stdio.h>
#include <arpa/inet.h>
#include <string.h>
#include <signal.h>
#include <linux/if_packet.h>
#include <net/ethernet.h>
#include <net/if.h>
#include <stdlib.h>
#include <arpa/nameser.h>
#include <assert.h>
#include "/root/projects/dnsfind/domain2name.c"
int hex2int (char hex) {
if (hex >= '0' && hex <= '9')
return hex-'0';
if (hex >= 'a' && hex <= 'f')
return 10+hex-'a';
if (hex >= 'A' && hex <= 'A')
return 10+hex-'A';
return -1;
}
int mac_pton (const char * src, unsigned char * dst) {
for (int i = 0; i < 6; i++) {
if (hex2int(src[0]) == -1 || hex2int(src[1]) == -1)
return 0;
dst[i] = hex2int(src[0]) << 4 | hex2int(src[1]);
src += 3;
}
return 1;
}
unsigned long checksum (void * data, int len) { // i cant into checksums im retarded
unsigned sum = 0;
for (int i = 0; i+1 < len; i += 2)
sum += *((unsigned char *) data + i)*256+*((unsigned char *) data + i + 1);
if (len % 2)
sum += ((unsigned char *) data)[len-1];
return sum;
}
uint16_t checksum_final (unsigned long sum) {
sum += sum >> 16;
sum &= 0xffff;
sum ^= 0xffff;
if (sum == 0)
sum = 0xffff;
return htons(sum);
}
int main (int argc, char ** argv) {
if (argc != 5) {
fprintf(stderr, "%s <dst ipv6> <src ipv6> <if index> <router mac> <querydomain>\n", argv[0]);
return 4;
}
int sock = socket(AF_PACKET, SOCK_DGRAM, htons(ETHERTYPE_IPV6));
if (sock == -1) {
perror("socket(AF_PACKET, SOCK_DGRAM, htons(ETHERTYPE_IPV6)");
return 1;
}
HEADER dns = {
.id = htons(0x1337),
.qr = 0, // question
.opcode = ns_o_query,
.rd = 1, // recursion
.qdcount = htons(1)
};
unsigned char question[5] = "";
*((uint16_t *) (question+1)) = htons(ns_t_any);
*((uint16_t *) (question+3)) = htons(ns_c_in);
struct udphdr udp = {
.source = htons(6969),
.dest = htons(53),
.len = htons(8+sizeof dns+sizeof question)
};
struct ip6_hdr ip6 = {
.ip6_ctlun.ip6_un1.ip6_un1_plen = udp.len,
.ip6_ctlun.ip6_un1.ip6_un1_hlim = 255,
.ip6_ctlun.ip6_un1.ip6_un1_nxt = IPPROTO_UDP
};
ip6.ip6_ctlun.ip6_un2_vfc |= 0x60;
switch (inet_pton(AF_INET6, argv[1], ip6.ip6_dst.s6_addr)) {
case -1:
perror("inet_pton(AF_INET6, argv[1])");
return 2;
break;
case 0:
fprintf(stderr, "naslov %s ni veljaven\n", argv[1]);
return 12;
break;
}
switch (inet_pton(AF_INET6, argv[2], ip6.ip6_src.s6_addr)) {
case -1:
perror("inet_pton(AF_INET6, argv[2])");
return 9;
break;
case 0:
fprintf(stderr, "naslov %s ni veljaven\n", argv[1]);
return 11;
break;
}
struct iovec msg[] = {
{
.iov_base = &ip6,
.iov_len = sizeof ip6
},
{
.iov_base = &udp,
.iov_len = sizeof udp
},
{
.iov_base = &dns,
.iov_len = sizeof dns
},
{
.iov_base = &question,
.iov_len = sizeof question
}
};
unsigned long sum = ip6.ip6_ctlun.ip6_un1.ip6_un1_nxt + checksum(&ip6.ip6_ctlun.ip6_un1.ip6_un1_plen, sizeof(uint16_t)) + checksum(&ip6.ip6_src, sizeof ip6.ip6_src) + checksum(&ip6.ip6_dst, sizeof ip6.ip6_dst);
for (size_t i = 1; i < sizeof msg/sizeof msg[0]; i++)
sum += checksum(msg[i].iov_base, msg[i].iov_len);
udp.check = checksum_final(sum);
udp.check = 0;
int ifindex = atoi(argv[3]);
struct sockaddr_ll dst = {
.sll_family = AF_PACKET,
.sll_ifindex = ifindex,
.sll_halen = 6,
.sll_protocol = htons(ETHERTYPE_IPV6)
};
if (!mac_pton(argv[4], dst.sll_addr)) {
fprintf(stderr, "naslov %s ni veljaven\n", argv[4]);
return 13;
}
struct mmsghdr mmsghdr = {
.msg_hdr = {
.msg_name = &dst,
.msg_namelen = sizeof dst,
.msg_iov = msg,
.msg_iovlen = sizeof msg / sizeof msg[0]
}
};
/* if (sendmmsg(sock, &mmsghdr, 1, 0) == -1) {
perror("sendmmsg(sock, &mmsghdr, 1, 0)");
return 3;
} */
if (sendmsg(sock, &mmsghdr.msg_hdr, 0) == -1) {
perror("sendmsg");
return 5;
}
return 0;
}
|
