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|
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <windows.h>
#include <winsock2.h>
#pragma comment(lib, "ws2_32.lib")
/**************
* prototypes *
**************/
void display_error(char * errorType);
char * get_host(char * httpRequest);
int proxy(SOCKET socket_client);
/*************
* functions *
*************/
/*
* display_error()
*/
void display_error(char * errorType){
LPVOID lpMsgBuf;
FormatMessage( FORMAT_MESSAGE_ALLOCATE_BUFFER | FORMAT_MESSAGE_FROM_SYSTEM,
NULL,
GetLastError(),
MAKELANGID(LANG_NEUTRAL, SUBLANG_DEFAULT),
(LPTSTR) &lpMsgBuf,
0,
NULL);
// Affichage du message dans une boite de dialogue
MessageBox( NULL, lpMsgBuf, errorType, MB_OK | MB_ICONERROR );
// Libération du buffer
LocalFree( lpMsgBuf );
}
/*
* get_host()
* fonction qui isole le header http (Host:)
*/
char * get_host(char * httpRequest){
unsigned short i = 0, j = 0;
char * buffer = strstr(httpRequest, "Host: ");
char * host = (char *)malloc(256 * sizeof(char));
memset(host, '\0', sizeof(host));
while( buffer[i] != '\n' )
i++;
for(j = 6; j < i-1; j++)
host[j - 6] = buffer[j];
host[j-6+1] = '\0';
return host;
}
/*
* proxy()
*/
int proxy(SOCKET socket_client){
SOCKET envoi;
SOCKADDR_IN server2;
struct hostent * structHost;
char buffer[1024*10]; // 10 ko
//char buffer2[10];
char buffer2 = '\0';
memset(buffer,'\0', sizeof(buffer));
//memset(buffer2,'\0', sizeof(buffer2));
// On recoit la requete du navigateur
int size = recv(socket_client, buffer, sizeof(buffer), 0);
fprintf(stdout, "----Commande recue ----\r\n%s----\r\n", buffer);
// On récupère le header (Host:) de la requete
// pour pouvoir se connecter au serveur web
char * host = get_host(buffer);
//fprintf(stdout,"Host : [%s]\r\n", get_host(buffer));
// On envoie la requete au serveur web
// grace a un nouveau socket
if((structHost = gethostbyname(host)) == NULL){
fprintf(stderr,"Host error\r\n");
display_error("Host error !");
ExitThread(0);
}
if((envoi = socket(AF_INET, SOCK_STREAM, 0)) == INVALID_SOCKET){
fprintf(stderr, "Socket error. Error: %d\r\n", WSAGetLastError());
display_error("Socket error !");
ExitThread(0);
}
server2.sin_family = AF_INET;
server2.sin_port = htons(80);
server2.sin_addr = *((struct in_addr *)structHost->h_addr);
memset(&(server2.sin_zero),'\0',8);
if( connect(envoi,(struct sockaddr * )&server2, sizeof(struct sockaddr)) == -1){
fprintf(stderr,"Error connect\r\n");
display_error("Connect Error !");
ExitThread(0);
}
send(envoi, buffer, strlen(buffer), 0);
// Reception des donnees a partir du serveur
// et les renvoies au navigateur
printf("Debut ###################################### \r\n");
int octet = 0;
while( (size = recv(envoi, &buffer2, sizeof(buffer2),0)) > 0){
octet += size;
//printf("size: %d - octets: %2d\r\n", size, octet);
//buffer2[size] = '\0';
//fprintf(stdout, "---buffer----\r\n%s\r\n----", buffer2);
// Renvoie de la réponse au navigateur
// printf("recu, envoi ...\n");
send(socket_client, &buffer2, 1,0);
// printf("envoye!\n");
//memset(buffer2,'\0', 1024);
}
printf("octets: %2d\r\n", octet);
printf("FIN ###################################### \r\n");
//Nettoyage
closesocket(socket_client);
fprintf(stdout, "Exiting Thread.\r\n");
ExitThread(0);
return 0;
}
/**********
* main() *
**********/
int main(int argc, char * argv[]){
// Initialisation
WSADATA WSAData;
if( WSAStartup(MAKEWORD(2,0),&WSAData) != 0 )
{
fprintf(stderr, "WSAStartup error. Error: %d\r\n", WSAGetLastError());
display_error("WSAStartup error !");
return 1;
}
// Variables
SOCKET socket_local;
SOCKET socket_client;
SOCKADDR_IN server;
SOCKADDR_IN client;
DWORD dwThreadID;
int sin_size = sizeof(SOCKADDR_IN);
if( (socket_local = socket(AF_INET,SOCK_STREAM,0) ) == INVALID_SOCKET )
{
fprintf(stderr, "Socket error. Error: %d\r\n", WSAGetLastError());
display_error("Socket error !");
WSACleanup();
return 1;
}
// Configuration du proxy (port 8080)
server.sin_family = AF_INET;
server.sin_port = htons(8080);
server.sin_addr.s_addr = INADDR_ANY;
memset(&(server.sin_zero),'\0',8);
if( bind(socket_local,(struct sockaddr * )&server,sizeof(struct sockaddr)) == SOCKET_ERROR)
{
fprintf(stderr, "Bind error. Error: %d\r\n", WSAGetLastError());
display_error("Bind error !");
closesocket(socket_client);
WSACleanup();
return 1;
}
listen(socket_local, SOMAXCONN);
// Attente de connexion, si erreur on quitte le programme
while(1)
{
if( (socket_client = accept(socket_local,(struct sockaddr * )&client,&sin_size)) == INVALID_SOCKET )
{
fprintf(stderr, "Accept error.Error: %d\r\n", WSAGetLastError());
display_error("Accept error !");
closesocket(socket_client);
WSACleanup();
return 1;
}
else
{
fprintf(stdout,"Connection de : %s \n",inet_ntoa(client.sin_addr));
// On cree un thread par nouvelle connexion en
// appelant la fonction proxy avec comme paramètre le socket client
// Si erreur a la creation d un thread on quitte
if( CreateThread( NULL,
0,
(LPTHREAD_START_ROUTINE) proxy,
socket_client,
0,
&dwThreadID) == NULL )
{
fprintf(stderr, "CreateThread error.\r\n");
display_error("CreateThread error !");
return 1;
}//proxy(socket_client);
}
}
return 0;
} |
[C]Proxy
.
dans la fonction proxy.
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