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#include <stdio.h>
#include <stdlib.h>
#include <errno.h>
#include <string.h>
#include <sys/types.h>
#include <sys/socket.h>
#include <netinet/ip.h>
#include <arpa/inet.h>
#include <unistd.h>
#define PRINT_ERRNO() {printf("%s:%i %i:%s\n", __FILE__, __LINE__, errno, strerror(errno));}
#define UDP_BUFFER_LEN 512
int dns_parse_packet(int _socket, struct sockaddr_in *sockaddr_client, socklen_t sockaddr_client_len, char* buffer);
int main(int argc, char* argv[])
{
int ret;
int sock_server;
struct sockaddr_in sock_server_addr;
char recv_buffer[ UDP_BUFFER_LEN ];
sock_server = socket ( AF_INET, SOCK_DGRAM, 0 );
if ( sock_server == -1 ) {
PRINT_ERRNO();
return errno;
}
memset( &sock_server_addr, '\0', sizeof(struct sockaddr_in) );
sock_server_addr.sin_family = AF_INET;
sock_server_addr.sin_port = htons( 53 );
ret = inet_aton ( "0.0.0.0", & sock_server_addr.sin_addr );
if( ret == 0 ) {//Error on 0, no errno
printf("Invalid IP\n");
return 1;
}
ret = bind( sock_server , &sock_server_addr, sizeof(struct sockaddr_in) );
if ( ret == -1 ) {
PRINT_ERRNO();
return errno;
}
//while( 1 )
{
struct sockaddr_in sock_client_addr;
socklen_t sock_client_addr_len;
sock_client_addr_len = sizeof ( struct sockaddr_in );
memset ( &sock_client_addr, '\0', sock_client_addr_len );
ret = recvfrom ( sock_server, recv_buffer, UDP_BUFFER_LEN, 0, &sock_client_addr, &sock_client_addr_len );
if ( ret == -1 ) {
PRINT_ERRNO();
return errno;
}
}
close( sock_server );
return 0;
}
int dns_parse_packet(int _socket, struct sockaddr_in *sockaddr_client, socklen_t sockaddr_client_len, char* buffer)
{
pid_t = pid fork();
if ( pid == 0)
return 0;
else if ( pid < 0 )
return errno;
exit (0);
}
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