/* Begin server3.c */ 
/* By William D. Larry [Ellectr0n] - Saturday, August 21, 2001 */ 
/* Copyright  2001(c) William D. Larry <wdlarry@hotmail.com> */ 
/* This program code is licensed under the GLP. Please read GPL for more information */ 
/* here we go... */ 

/*
* A simple Server-Applikation, that receives a String and answers to the client.
*/

/* Include neccessery header files */ 
#include <sys/types.h> 
#include <sys/socket.h> 
#include <stdio.h> 
#include <netinet/in.h> 
#include <sys/un.h> 
#include <arpa/inet.h> 
#include <unistd.h> 

#define SOCKET_NAME "sockli"

int main(void) 
{ 
        int sock, len; 
        int result; 
        int n; 
        char buf[256]; 
        //struct sockaddr_in addr; 
        struct sockaddr_un addr = {0}; 

        sock = socket(AF_UNIX, SOCK_DGRAM, 0); 

        if(!sock) 
        { 
                perror("creating dgram socket"); 
                exit(1); 
        } 

        memset(&addr, 0, sizeof(addr)); 

        /* set up the address */ 
        /*addr.sin_family = AF_INET; 
        addr.sin_port = 9836; 
        addr.sin_addr.s_addr = inet_addr("127.0.0.1"); 
        len = sizeof(addr); */

		unlink(SOCKET_NAME);
 		addr.sun_family = AF_UNIX;
        strcpy(addr.sun_path, SOCKET_NAME);
        len = sizeof(addr);		

        result = bind(sock, (struct sockaddr *)&addr, len); 

        if(result < 0) 
        { 
                perror("binding to dgram socket"); 
                exit(1); 
        }

        n = recvfrom(sock, buf, 256, 0, (struct sockaddr *)&addr, &len); 
		buf[n] = '\0';
		
        if(n < 1) 
        { 
                /* received less than 1 byte... that's illigal! */ 
                fprintf(stderr, "server3: received data of illigal size\n"); 
                exit(1); 
        } 

       	printf("RECEIVED FROM CLIENT: %s\n", buf);

        memset(buf, '\0', 256); 
        strcpy(buf, "\n\nHallo Client\n\n");
 		
 		addr.sun_family = AF_UNIX;
        strcpy(addr.sun_path, SOCKET_NAME);
        len = sizeof(addr);
        
        n = sendto(sock, buf, strlen(buf), 0, (struct sockaddr *)&addr, len); 

        if(n != strlen(buf)) 
        { 
                perror("sendto failed"); 
                exit(1); 
        } 

        close(sock); 
        
        //printf("\n\nSENT: %d, LEN: %d\n\n", n, strlen(buf));
}