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#include <stdio.h>
#include <sys/socket.h>
#include <arpa/inet.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include <netinet/in.h>
#define MAXPENDING 5 /* Max connection requests */
#define BUFFSIZE 32
void Die(char *mess) {perror(mess); exit(1);}
void HandleClient(int sock, char *tab) {
char buffer[BUFFSIZE];
int i, received = -1;
/* Receive message */
if ((received = recv(sock, buffer, BUFFSIZE, 0)) < 0) {
Die("Failed to receive initial bytes from client");
}
/* Send bytes and check for more incoming data in loop */
while (received > 0) {
/* Send back received data */
if (send(sock, buffer, received, 0) != received) {
Die("Failed to send bytes to client");
}
/* Check for more data */
if ((received = recv(sock, buffer, BUFFSIZE, 0)) < 0) {
Die("Failed to receive additional bytes from client");
}
for(i=0; i < 4; i++){
printf("%.2x\n",buffer[i]);
}
}
close(sock);
}
int main(int argc, char *argv[]){
int serversock, clientsock;
struct sockaddr_in echoserver, echoclient;
char *tab;
if (argc != 2) {
fprintf(stderr, "USAGE: echoserver <port>\n");
exit(1);
}
/* Create the TCP socket */
if ((serversock = socket(PF_INET, SOCK_STREAM, IPPROTO_TCP)) < 0) {
Die("Failed to create socket");
}
printf("Bonjour 1\n");
/* Construct the server sockaddr_in structure */
memset(&echoserver, 0, sizeof(echoserver)); /* Clear struct */
echoserver.sin_family = AF_INET; /* Internet/IP */
echoserver.sin_addr.s_addr = htonl(INADDR_ANY); /* Incoming addr */
echoserver.sin_port = htons(atoi(argv[1])); /* server port */
printf("Bonjour 2\n");
/* Bind the server socket */
if (bind(serversock, (struct sockaddr *) &echoserver, sizeof(echoserver)) < 0) {
Die("Failed to bind the server socket");
}
printf("Bonjour 3\n");
/* Listen on the server socket */
if (listen(serversock, MAXPENDING) < 0) {
Die("Failed to listen on server socket");
}
printf("Bonjour 4\n");
/* Run until cancelled */
while (1) {
unsigned int clientlen = sizeof(echoclient);
/* Wait for client connection */
if ((clientsock =
accept(serversock, (struct sockaddr *) &echoclient, &clientlen)) < 0) {
Die("Failed to accept client connection");
}
fprintf(stdout, "Client connected: %s\n", inet_ntoa(echoclient.sin_addr));
HandleClient(clientsock, tab);
}
} |
