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| #include <stdio.h>
#include <stdlib.h>
#include <errno.h>
#include <string.h>
#include "tcp.h"
#define DEBUG 1
/**
* Init (for windows only)
*/
int tcp_init() {
if(DEBUG) printf("TCP init ");
#ifdef WIN32
WSADATA wsa;
int err = WSAStartup(MAKEWORD(2, 2), &wsa);
if(err < 0)
{
if(DEBUG) {
puts("WSAStartup failed !");
exit(EXIT_FAILURE);
}
return -1;
}
if(DEBUG) printf(": windows");
#endif
if(DEBUG) printf("\n");
return 1;
}
/**
* free (for windows only)
*/
void tcp_free() {
if(DEBUG) printf("TCP free\n");
#ifdef WIN32
WSACleanup();
#endif
}
/**
* connect client to server
*/
int tcp_connect(TcpClient * s, char * ip, unsigned int port) {
SOCKET sock = socket(AF_INET, SOCK_STREAM, 0);
SOCKADDR_IN sin = { 0 };
struct hostent *hostinfo;
if(sock == INVALID_SOCKET)
{
if(DEBUG) {
perror("socket()");
exit(errno);
}
return -1;
}
hostinfo = gethostbyname(ip);
if (hostinfo == NULL)
{
if(DEBUG) {
fprintf (stderr, "Unknown host %s.\n", ip);
exit(EXIT_FAILURE);
}
return -2;
}
sin.sin_addr = *(IN_ADDR *) hostinfo->h_addr;
sin.sin_port = htons(port);
sin.sin_family = AF_INET;
if(connect(sock,(SOCKADDR *) &sin, sizeof(SOCKADDR)) == SOCKET_ERROR)
{
if(DEBUG) {
perror("connect()");
exit(errno);
}
return -3;
}
s->socket = sock;
if(DEBUG) printf("* TCP connect : success to connect %s:%d\n", ip, port);
return 1;
}
/**
* close connection to server
*/
void tcp_close(TcpClient * s) {
closesocket(s->socket);
if(DEBUG) printf("* TCP close connection\n");
}
/**
* send data from client to server
*/
int tcp_send(TcpClient * s, void * data) {
if(send(s->socket, data, strlen(data), 0) < 0)
{
if(DEBUG) {
perror("send()");
exit(errno);
}
return -1;
}
if(DEBUG) printf("* TCP write data : success\n");
return 1;
}
/**
* return 1 if some data has been received from server
*/
int tcp_has_received_data(TcpClient * s) {
fd_set rdfs;
FD_ZERO(&rdfs);
FD_SET(s->socket, &rdfs);
if(DEBUG) printf("\tWait for event\n");
if(select(s->socket, &rdfs, NULL, NULL, NULL) == -1)
{
if(DEBUG) {
perror("select()");
exit(errno);
}
return -1;
}
if(DEBUG) printf("\t Event !\n");
if(FD_ISSET(s->socket, &rdfs)) {
return 1;
}
return 0;
}
/**
* return availables data from server
*/
int tcp_get_data(TcpClient * s, void * data, unsigned int * size) {
*size = 0;
if((*size = recv(s->socket, data, 1024, 0)) < 0)
{
if(DEBUG) {
perror("recv()");
exit(errno);
}
return -1;
}
return 1;
}
/**
* create new tcp server
*/
int tcp_create_server(TcpServer * s, int port) {
SOCKET sock = socket(AF_INET, SOCK_STREAM, 0);
SOCKADDR_IN sin = { 0 };
if(sock == INVALID_SOCKET)
{
if(DEBUG) {
perror("socket()");
exit(errno);
}
return -1;
}
s->socket = sock;
s->clients = NULL;
s->numberOfClients = 0;
sin.sin_addr.s_addr = htonl(INADDR_ANY);
sin.sin_port = htons(port);
sin.sin_family = AF_INET;
if(bind(s->socket,(SOCKADDR *) &sin, sizeof sin) == SOCKET_ERROR)
{
if(DEBUG) {
perror("bind()");
exit(errno);
}
return -2;
}
if(DEBUG) printf("* TCP server create : success (port %d)\n", port);
return 1;
}
// TODO : THREAD + MUTEX ON TCPSERVER * S !!
/**
* wait for client connections
*/
int tcp_listen(TcpServer * s, int maxClients) {
s->clients = (TcpClient **)malloc(maxClients*sizeof(TcpClient*));
if(listen(s->socket, maxClients) == SOCKET_ERROR)
{
if(DEBUG) {
perror("listen()");
exit(errno);
}
return -1;
}
if(DEBUG) printf("* TCP server listen\n");
while(1) {
SOCKADDR_IN csin = { 0 };
SOCKET client_socket;
socklen_t sinsize = sizeof csin;
client_socket = accept(s->socket, (SOCKADDR *)&csin, &sinsize);
if(client_socket == INVALID_SOCKET)
{
if(DEBUG) {
perror("accept()");
exit(errno);
}
return -2;
}
s->clients[s->numberOfClients] = (TcpClient *)malloc(sizeof(TcpClient));
s->clients[s->numberOfClients]->socket = client_socket;
s->numberOfClients++;
if(DEBUG) tcp_send_to_all(s, "Un nouveau client s'est connecté au serveur !");
if(DEBUG) printf("\tNew client (notification send to all)\n");
}
return 1;
}
/**
* kill tcp server
*/
void tcp_kill_server(TcpServer * s) {
closesocket(s->socket);
if(DEBUG) printf("* TCP kill server\n");
}
/**
* send data to all clients
*/
void tcp_send_to_all(TcpServer * s, void * data) {
int i;
for(i = 0; i < s->numberOfClients; i++) {
tcp_send(s->clients[i], data);
}
} |
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