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#include <stdio.h>
#include <stdarg.h>
#include <winsock2.h>
#include <string.h>
#include <errno.h>
extern int errno;
struct pseudohdr
{
u_long saddr;
u_long daddr;
u_char zero;
u_long protocol;
u_long length;
};
struct tcphdr
{
unsigned short sport; /* port source */
unsigned short dport; /* port de destination */
unsigned int seqnum; /* numéro de séquence */
unsigned int acknum; /* accusé de réception */
unsigned char dataoffset:4; /* décalage des données (data offset) */
/* flags */
unsigned char reserved:6;
unsigned char urg:1;
unsigned char ack:1;
unsigned char psh:1;
unsigned char rst:1;
unsigned char syn:1;
unsigned char fin:1;
unsigned short windows; /* fenêtre */
unsigned short checksum; /* checksum */
unsigned short urgpointer; /* pointeur de données urgentes */
};
struct iphdr
{
unsigned char version:4; /* version du protocol IP*/
unsigned char ihl:4; /* longeur de l'en tète */
unsigned char tos; /* type de service */
unsigned short tot_len; /* longueur totale du datagramme */
unsigned short id; /* identification */
unsigned char M:1; /* flag M*/
unsigned char df:1; /* flag df*/
unsigned char mf:1; /* flag mf*/
unsigned short frag_off:13; /* décalage de fragmentation */
unsigned char ttl; /* durée de vie du paquet */
unsigned char protocol; /* protocole */
unsigned short checksum; /* somme de contrôle */
unsigned long saddr; /* adresse IP source */
unsigned long daddr; /* adresse IP destinataire */
};
struct paquettcp
{
struct iphdr ippart;
struct tcphdr tcppart;
struct pseudohdr pseudopart;
char data[4096];
};
unsigned short checksum(u_short *addr, int len);
main()
{
int taillepaquet=0;
char ipsource[200];
char ipdestination[200];
unsigned int ipid=0,frago=0,ttl=0,mf=0,df=0;
unsigned int portsrc=0,portdest=0,flagack,flagurg,flagfin,flagsyn,flagrst,
flagpsh,seqnum=0,acknum=0,decdata=0,win=0,urgptr=0;
char data[4096];
struct hostent *hotesrc,*hotedest;
struct paquettcp *lepaquet;
struct sockaddr_in sock;
int lasocket,i,nbPacket;
struct in_addr lasource;
WORD wVersionRequested;
WSADATA WSAData; /* structure WSADATA définie dans winsock.h */
int err;
wVersionRequested = MAKEWORD(2,0); /* 1.1 version voulu de Winsock */
err = WSAStartup(wVersionRequested, &WSAData); /* appel de notre fonction */
/* controle d'erreur */
if(err == 0) fprintf(stdout, "[*] Winsock a ete initialise avec succes.\n");
else {
fprintf(stderr, "Erreur lors de l'initialisation de Winsock, code d'erreur : %d\n", GetLastError());
return(-1);
}
printf("TCP MAKER\n");
lepaquet=(struct paquettcp *)calloc(1,sizeof(struct paquettcp));
printf("1. Configuration IP\n");
printf("IP source : ");
scanf("%199s", ipsource);
printf("IP destination : ");
fflush(stdin);
scanf("%199s", ipdestination);
/*
printf("IP id : ");
scanf("%d", &ipid); // identifiant IP du paquet
printf("IP FragOff : ");
scanf("%d", &frago);
printf("IP ttl : ");
scanf("%d", &ttl);
*/
/*printf("IP Frag DF : ");
scanf("%d", &df);
printf("IP Frag MF : ");
scanf("%d", &mf);*/
sock.sin_addr.s_addr=inet_addr(ipdestination);
unsigned int adr = inet_addr(ipdestination);
lasource.s_addr=inet_addr(ipsource);
if((lasource.s_addr=inet_addr(ipsource))==-1)
{
printf("Adresse IP non valide");
return 0;
}
printf("Verification des donnees IP entrees\n");
hotesrc=gethostbyaddr((char *)&lasource,sizeof(lasource),AF_INET); /*résoud ip source*/
hotedest=gethostbyaddr((char *)&sock.sin_addr.s_addr,sizeof(sock.sin_addr.s_addr),AF_INET); /*résoud ip destination*/
//hotesrc=gethostbyname(ipsource);
//hotedest=gethostbyname(ipdestination);
printf("%s\n", hotesrc->h_name);
printf("%s\n", hotedest->h_name);
printf("%s\n", hotesrc->h_addr);
printf("%s\n", hotedest->h_addr);
printf("%d\n", hotesrc->h_length);
printf("%d\n", hotedest->h_length);
system("PAUSE"); |
socket : probl�me avec GetHostByName
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