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| /*
Concours 12 pour SecurityHack
gcc -o Server concours12.c -lpthread
*/
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#if defined(WIN32)
#include <winsock2.h>
#pragma comment(lib, "ws2_32.lib")
#else
#include <sys/types.h>
#include <sys/socket.h>
#include <netinet/in.h>
#include <arpa/inet.h>
#include <errno.h>
#endif
#include <pthread.h>
#define PORT 2200
#define BACKLOG 2
#define MAXSIZE 1024
void str_reverse(char * string)
{
int i = 0;
int size = strlen(string);
char cBuffer;
for(i=0;i < size/2 + 1;i++)
{
cBuffer = string[i];
string[i] = string[size-1-i];
string[size-1-i] = cBuffer;
}
}
void * new_client(int sock_accept)
{
char * string = (char *) malloc(MAXSIZE*sizeof(char));
int length;
if(send(sock_accept,"Entrez une phrase : \n",21,0) == -1)
{
perror("send");
}
if((length = recv(sock_accept,string,MAXSIZE,0)) == -1)
perror("recv");
else
{
string[length-1]='\0';
fprintf(stdout,"Chaine recue : %s \n",string);
}
str_reverse(string);
if(send(sock_accept,string,strlen(string)+1,0) == -1)
perror("send");
else
fprintf(stdout,"Chaine renvoye : %s \n",string);
#if defined(WIN32)
closesocket(sock_accept);
#else
close(sock_accept);
#endif
free(string);
pthread_exit(0);
return NULL;
}
int main(int argc, char * argv[])
{
#if defined(WIN32)
WSADATA WSAData;
WSAStartup(MAKEWORD(2,0), &WSAData);
#endif
int sock;
int sock_accept;
struct sockaddr_in server;
struct sockaddr_in client;
int sin_size;
pthread_t thread;
if((sock = socket(AF_INET,SOCK_STREAM,0)) == -1)
{
perror("socket");
exit(1);
}
server.sin_family = AF_INET;
server.sin_port = htons(PORT);
server.sin_addr.s_addr = INADDR_ANY;
memset(&(server.sin_zero),'\0',8);
if(bind(sock,(struct sockaddr * )&server,sizeof(struct sockaddr)) == -1)
{
perror("bind");
exit(1);
}
if(listen(sock,BACKLOG) == -1)
{
perror("listen");
exit(1);
}
fprintf(stdout,"En attente de connection ...\nCTRL + C pour quitter!\n");
while(1)
{
sin_size = sizeof(struct sockaddr_in);
if((sock_accept = accept(sock,(struct sockaddr * )&client,&sin_size)) == -1)
perror("accept");
else
{
fprintf(stdout,"Connection de : %s \n",inet_ntoa(client.sin_addr));
pthread_create(&thread,NULL,new_client,sock_accept);
}
}
return 0;
} |
