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#include <stdio.h>
#include <errno.h>
#include <sys/types.h>
#include <sys/socket.h>
#include <netinet/in.h>
#include <netdb.h>
#include <arpa/inet.h>
#include <stdlib.h>
#include <string.h>
int main(int argc, char **argv){
char buffer[512]; // The buffer
int mySocket = -1;
int otherSocket = -1;
// need by select
int nb;
fd_set read_set;
// Use by the Server
struct sockaddr_in servAddr, clientAddr; // The struct for adresses
char *message; // The text
int servAddr_length = -1;
// Use by the client
char *serverName = argv[1];
struct sockaddr_in serverSockAddr;
struct hostent *serverHostEnt;
// resolv the adress
struct hostent *resolv;
struct in_addr *addr;
// server
if(argc == 1){
servAddr.sin_port = htons(30000);
servAddr.sin_family = AF_INET;
servAddr.sin_addr.s_addr = htonl(INADDR_ANY);
// socket creation
if((mySocket = socket(AF_INET,SOCK_STREAM,0))== -1){
printf("error during socket's creation\n");
exit(0);
}
// server-socket binding
bind(mySocket,(struct sockaddr *)&servAddr,sizeof(servAddr));
// socket listening
listen(mySocket,5);
// connection accepting
servAddr_length = sizeof(clientAddr);
otherSocket = accept(mySocket,(struct sockaddr *)&clientAddr,&servAddr_length);
if (otherSocket < 0){
printf("acception error\n");
}
else{
printf("connection OK\n");
}
}
// Client
else if( argc == 2){
resolv = gethostbyname(serverName);
if (resolv==NULL) {
printf("Address not found for %s\n", argv[1]);
exit(-1);
}
else {
addr = (struct in_addr*) resolv->h_addr_list[0];
printf("The IP address of %s is %s\n", argv[1], inet_ntoa(*addr));
}
if(((long)inet_ntoa(*addr)) != (long)-1)
bcopy(resolv->h_addr,&serverSockAddr.sin_addr,resolv->h_length);
serverSockAddr.sin_port = htons(30000);
serverSockAddr.sin_family = AF_INET;
/* socket's creation */
if((mySocket = socket(AF_INET,SOCK_STREAM,0)) < 0){
printf("error during client socket's creation\n");
exit(0);
}
/* demand of connection to the server */
if(connect(mySocket,(struct sockaddr *)&serverSockAddr,sizeof(serverSockAddr)) < 0 ){
printf("connection's error\n");
exit(0);
}
printf("client OK\n");
}
else{
printf("error");
exit(-1);
}
// The communication
while(1){
// Clean the buffer
bzero(buffer, sizeof(buffer));
FD_ZERO(&read_set);
FD_SET(0, &read_set);
FD_SET(mySocket, &read_set);
nb = select(mySocket+1, &read_set, NULL, NULL, NULL);
if(nb <= 0){
printf("Error with the select\n");
exit(-1);
}
if(FD_ISSET(mySocket, &read_set)){
nb = read(mySocket, buffer, sizeof(buffer));
if(nb == 0){printf("EOF\n");}
printf("%s\n", buffer);
}
if(FD_ISSET(0, &read_set)){
nb = write(0, buffer, sizeof(buffer));
}
printf("buffer : ");
printf("%s\n", buffer);
}
shutdown(mySocket,2);
close(mySocket);
close(otherSocket);
return 0;
} |
