#include <stdio.h> 
#include <string.h> 
#include <netdb.h> 
#include <netinet/in.h>   

#define BUFFER_SIZE 1024 
#define NAME_SIZE 2048 

int handling(int c)  { 
	char buffer[BUFFER_SIZE], name[NAME_SIZE]; 
	int bytes; 

	strcpy(buffer, "My name is: "); 
	
	bytes = send(c, buffer, strlen(buffer), 0); 
	
	if (bytes == -1) return -1; 
	
	bytes = recv(c, name, sizeof(name), 0); 
	
	if (bytes == -1) return -1; 

	name[bytes - 1] = '\0'; 

	sprintf(buffer, "Hello %s, nice to meet you!\r\n", name); 
	
	bytes = send(c, buffer, strlen(buffer), 0); 
	
	if (bytes == -1) return -1; return 0;  
} 
	
int main(int argc, char *argv[])  { 
	int s, c, cli_size; 
	struct sockaddr_in srv, cli; 
	
	if (argc != 2) { 
		fprintf(stderr, "usage: %s port\n", argv[0]); 
		return 1; 
	} 
	
	s = socket(AF_INET, SOCK_STREAM, 0); 
	
	if (s == -1) { 
		perror("socket() failed"); 
		return 2; 
	} 
	
	srv.sin_addr.s_addr = INADDR_ANY; 
	srv.sin_port = htons( (unsigned short int) atol(argv[1])); 
	srv.sin_family = AF_INET; 
	
	if (bind(s, &srv, sizeof(srv)) == -1) { 
		perror("bind() failed"); 
		return 3; 
	} 
	
	if (listen(s, 30) == -1) { 
		perror("listen() failed"); 
		return 4; 
	} 
	
	for(;;) { 
		
		//c = accept(s, (struct sockaddr *) &cli, sizeof(cli));
		c = accept(s, NULL, NULL);

		if (c == -1) { 
			perror("accept() failed"); 
			return 5; 
		} 
		
		printf("client from %s", inet_ntoa(cli.sin_addr)); 
		
		if (handling(c) == -1) fprintf(stderr, "%s: handling() failed", argv[0]); 
		
		close(c); 
	} 
	
	return 0;  
}