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
|
#include <winsock2.h>
#include<iostream>
using namespace std;
typedef struct iphdr {
unsigned char verlen; /* version du protocol IP + la longeur de l'en t?te */
unsigned char tos; /* type de service */
unsigned short tot_len; /* longueur totale du datagramme */
unsigned short id; /* identification */
unsigned short offset; /* décalage */
unsigned char ttl; /* dur?e de vie du paquet */
unsigned char protocol; /* protocole */
unsigned short checksum; /* somme de contr?le */
unsigned int saddr; /* adresse IP source */
unsigned int daddr; /* adresse IP destinataire */
} IP_HDR;
typedef struct tcphdr
{
unsigned short sport; /* port source */
unsigned short dport; /* port de destination */
unsigned int seqnum; /* num?ro de s?quence */
unsigned int acknum; /* accus? de r?ception */
unsigned char dataoffset; /* d?calage des donn?es (data offset) */
unsigned char flags; /* flags */
unsigned short windows; /* fen?tre */
unsigned short checksum; /* checksum */
unsigned short urgpointer; /* pointeur de donn?es urgentes */
} TCP_HDR;
struct pseudohdr
{
unsigned long saddr;
unsigned long daddr;
char useless;
unsigned char protocol;
unsigned short length;
struct tcphdr TCP;
};
USHORT cksum(USHORT *buffer, int size)
{
unsigned long cksum=0;
while (size > 1)
{
cksum += *buffer++;
size -= sizeof(USHORT);
}
if (size)
{
cksum += *(UCHAR*)buffer;
}
cksum = (cksum >> 16) + (cksum & 0xffff);
cksum += (cksum >>16);
return (USHORT)(~cksum);
}
int main()
{
system("TITLE Forgeur de packet TCP");
WSADATA WSAData;
WSAStartup(MAKEWORD(2,0), &WSAData);
SOCKET socket;
socket = WSASocket(AF_INET, SOCK_RAW, IPPROTO_RAW, NULL, 0,0);
if (socket == INVALID_SOCKET)
{
fprintf(stderr, "erreur lors de la cr?ation du raw socket : %d\n", WSAGetLastError());
WSACleanup();
exit(-1);
}
int optval = 1;
if (setsockopt(socket, IPPROTO_IP, 2, (char *)&optval, sizeof(optval)) == SOCKET_ERROR)
{
fprintf(stderr, "erreur lors de l'appel ? setsockopt : %d\n", WSAGetLastError());
WSACleanup();
exit(-1);
}
//-----------------------------------remplissage en-tête de l'ip------------------------------------
unsigned short packet_size, ip_version, ip_len; /* taille de notre paquet, IP version, longueur */
struct iphdr *ip; /* notre structure IP */
/* taille de notre paquet */
packet_size = sizeof(struct iphdr) + sizeof(struct tcphdr);
/* on alloue un espace m?moire pour notre structure IP */
ip = (struct iphdr *)malloc(sizeof(struct iphdr));
/* On l'initialise ? 0 */
memset(ip, 0x0, sizeof(struct iphdr));
/* longueur de l'en t?te IP */
ip_len = sizeof(struct iphdr) / sizeof(unsigned long);
/* IP version */
ip_version = 4;
/* on remplie la structure IP */
ip->verlen = (ip_version << 4) | ip_len;
ip->tos = 0;
ip->tot_len = htons (sizeof (struct iphdr) + sizeof (struct tcphdr));
ip->id = 1;
ip->offset = 0;
ip->ttl = 255;
ip->protocol = IPPROTO_TCP;
ip->saddr = inet_addr("192.168.1.81"); /* adresse IP source */
ip->daddr = inet_addr("192.168.1.1"); /* adresse IP de destination */
ip->checksum = 0; /* on initialise le champ checksum de notre structure IP ? 0 avant l'appel de la fonction calculant le checksum */
ip->checksum = cksum((unsigned short *)ip, sizeof(struct iphdr));
//----------------------------------remplissage en-tête tcp-------------------------------------------
struct tcphdr *tcp; /* notre structure TCP */
/* maintenant passons ? la structure TCP */
/* on alloue de la m?moire pour celle ci */
tcp = (struct tcphdr *)malloc(sizeof(struct tcphdr));
memset(tcp, 0x0, sizeof(struct tcphdr));
/* on la remplie */
tcp->sport = htons(1500); /* port source */
tcp->dport = htons(80) ; /* port de destination */
tcp->seqnum = htonl(1337); /* num?ro de s?quence */
tcp->acknum = htonl(1337); /* ack number */
tcp->dataoffset = (5) << 4; /* d?calage */
tcp->flags = 0x02; /* 0x02 = flag syn */
tcp->windows = htons(1337); /* fen?tre */
tcp->checksum = 0; /* checksum */
tcp->urgpointer = 0; /* options */
//---------------------remplissage de la structure pseudo hdr pour calculer le checksum de notre packet tcp-----------------------
struct pseudohdr *psdheader; /* pseudo header */
/* allocation m?moire pour notre pseudo header */
psdheader = (struct pseudohdr *)malloc(sizeof(struct pseudohdr));
memset(psdheader, 0x0, sizeof(struct pseudohdr));
/* on remplie notre structure */
psdheader->saddr = inet_addr("192.168.1.81"); /* adresse source */
psdheader->daddr = inet_addr("192.168.1.1"); /* adresse de destination */
psdheader->useless = 0; /* null */
psdheader->protocol = IPPROTO_TCP; /* protocol */
psdheader->length = htons(sizeof(struct tcphdr)); /* longueur de notre structure TCP_HDR */
psdheader->TCP = *tcp; /* structure TCP_HDR */
/* Maintenant nous calculons le checksum pour notre paquet */
tcp->checksum =cksum((unsigned short *)psdheader, sizeof(struct pseudohdr));
char *ptr = NULL, packet[32]; /* notre paquet, 32 = sizeof(struct icmphdr) + sizeof(struct iphdr) */
ZeroMemory(packet, sizeof(packet));
ptr = packet;
memcpy(ptr, ip, sizeof(struct iphdr));
ptr += sizeof(struct iphdr);
memcpy(ptr, tcp, sizeof(struct tcphdr));
ptr += sizeof(struct tcphdr);
//-------------------------------------------------envoi du packet----------------------------------------
struct sockaddr_in sin; /* notre structure sockaddr_in qui contiendra l'adresse de destination */
/* on rempli notre structure sockaddr_in */
sin.sin_family = AF_INET;
sin.sin_addr.s_addr = inet_addr("192.168.1.1"); // Adresse de destination
/* hop, nous envoyons notre paquet ? destination */
if(sendto(socket, packet, sizeof(packet), 0x0, (struct sockaddr *)&sin, sizeof(struct sockaddr_in)) == SOCKET_ERROR)
{
fprintf(stderr, "Erreur lors de l'appel de la fonction sendto. Code erreur : %d\n", WSAGetLastError());
}
free(ip);
free(tcp);
WSACleanup();
system("pause");
return 0;} |
Problème raw socket
Répondre avec citation
Envoyé par MSDN :: TCP/IP Raw Sockets
.
.
Partager