forked from vanhauser-thc/thc-ipv6
/
four2six.c
140 lines (126 loc) · 4.55 KB
/
four2six.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
#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 <sys/socket.h>
#include <netinet/in.h>
#include <arpa/inet.h>
#include "thc-ipv6.h"
void help(char *prg) {
printf("%s %s (c) 2015 by %s %s\n\n", prg, VERSION, AUTHOR, RESOURCE);
printf("Syntax: %s [-FHD] [-m srcmac] [-s src6] [-p srcport] interface ipv6-to-ipv4-gateway ipv4-src ipv4-dst [port]\n\n", prg);
printf("Options:\n");
printf(" -F insert atomic fragment header (can be set multiple times)\n");
printf(" -H insert and empty hop-by-hop header\n");
printf(" -D insert a large destination header that fragments the packet\n");
printf(" -p srcport set a specific UDP source port or Ping ID\n");
printf(" -s src6 set a specific IPv6 source address\n");
printf(" -m srcmac set a specific MAC source address\n");
printf("\nSend an IPv4 packet to an IPv6 4to6 gateway. If a port is specified, a UDP packet is sent, otherwise an ICMPv4 ping.\n");
exit(-1);
}
int main(int argc, char *argv[]) {
unsigned char *pkt1 = NULL, buf2[6], buf3[1500];
unsigned char *gateway6, *src6 = NULL, *dst6 = NULL, srcmac[16] = "", *mac = NULL;
int pkt1_len = 0, prefer = PREFER_GLOBAL, i, do_hop = 0, do_dst = 0, do_frag = 0, cnt, type = NXT_ICMP6, offset = 14;
char *interface;
thc_ipv6_hdr *hdr;
int src4 = 0, dst4 = 0, port = -1, sport = 10240 + getpid() % 10240;
if (argc < 5 || strncmp(argv[1], "-h", 2) == 0)
help(argv[0]);
if (getenv("THC_IPV6_PPPOE") != NULL || getenv("THC_IPV6_6IN4") != NULL) printf("WARNING: %s is not working with injection!\n", argv[0]);
while ((i = getopt(argc, argv, "DFHs:m:p:")) >= 0) {
switch (i) {
case 'F':
do_frag++;
break;
case 'H':
do_hop = 1;
break;
case 'D':
do_dst = 1;
break;
case 'm':
mac = srcmac;
sscanf(optarg, "%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]);
break;
case 's':
if ((src6 = thc_resolve6(optarg)) == NULL) {
fprintf(stderr, "Error: invalid IPv6 source address specified: %s\n", optarg);
}
break;
case 'p':
sport = atoi(optarg);
break;
default:
fprintf(stderr, "Error: invalid option %c\n", i);
exit(-1);
}
}
if (argc - optind < 4)
help(argv[0]);
if (do_hdr_size)
offset = do_hdr_size;
interface = argv[optind];
if ((gateway6 = thc_resolve6(argv[optind + 1])) == NULL) {
fprintf(stderr, "Error: %s does not resolve to a valid IPv6 address\n", argv[optind + 1]);
exit(-1);
}
// src ip4, dst ip4
if (inet_aton(argv[optind + 2], (struct in_addr *)&src4) < 0) {
fprintf(stderr, "Error: not a valid IPv4 address: %s\n", argv[optind + 2]);
exit(-1);
}
if (inet_aton(argv[optind + 3], (struct in_addr *)&dst4) < 0) {
fprintf(stderr, "Error: not a valid IPv4 address: %s\n", argv[optind + 3]);
exit(-1);
}
if (argc - optind > 4)
port = atoi(argv[optind + 4]);
if (mac == NULL) {
if ((mac = thc_get_own_mac(interface)) == NULL) {
fprintf(stderr, "Error: invalid interface %s\n", interface);
exit(-1);
}
}
if ((pkt1 = thc_create_ipv6_extended(interface, prefer, &pkt1_len, src6, gateway6, 64, 0, 0, 0, 0)) == NULL)
return -1;
if (do_hop) {
type = NXT_HBH;
if (thc_add_hdr_hopbyhop(pkt1, &pkt1_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(pkt1, &pkt1_len, cnt++) < 0)
return -1;
}
if (do_dst) {
if (type == NXT_ICMP6)
type = NXT_DST;
if (thc_add_hdr_dst(pkt1, &pkt1_len, buf3, sizeof(buf3)) < 0)
return -1;
}
if (thc_add_ipv4_rudimentary(pkt1, &pkt1_len, src4, dst4, sport, port) < 0)
return -1;
if (thc_generate_pkt(interface, mac, NULL, pkt1, &pkt1_len) < 0) {
fprintf(stderr, "Error: Can not generate packet, exiting ...\n");
exit(-1);
}
printf("Sending IPv4 %s packet from %s to %s via 4to6 gateway %s\n", port == -1 ? "ICMPv4 ping" : "UDPv4", argv[optind + 2], argv[optind + 3], argv[optind + 1]);
if (do_dst) {
hdr = (thc_ipv6_hdr *) pkt1;
thc_send_as_fragment6(interface, src6, dst6, type, hdr->pkt + 40 + offset, hdr->pkt_len - 40 - offset, 1240);
} else {
thc_send_pkt(interface, pkt1, &pkt1_len);
}
return 0;
}