Sends a UDP packet to the specified port on the specified server

Function: Reads a file file and sends a UDP packet to the specified port on the specified server.
2015.9.26 OK

#include <stdio.h>
#include <sys/socket.h>
#include <netinet/in.h>
#include <arpa/inet.h>
#include <netdb.h>
#include <string.h>

#define SERVER_PORT 8000
int server_port = 8000;

int getserveraddr (char * Addrname,char *addrport)
{
Char sztemp[512]={};
Char ipaddr[512]={};
Char port[512]={};
Char *CFA;

FILE *file_fa =fopen ("./send.conf", "r+");
if (file_fa==null)//if it fails
{
printf ("Open send.conf Error! \ n ");
Exit (1); Abort Program
}

if ((Fgets (SZTEMP,255,FILE_FA)) = NULL)//read one line at a time
{
printf ("sztemp=%s\n", sztemp);

CFA = Strtok (Sztemp, "");
sprintf (port, "%s", CFA);
CFA = Strtok (NULL, "");
sprintf (ipaddr, "%s", CFA);
CFA = Strtok (NULL, "");
sprintf (port, "%s", CFA);

printf ("ipaddr=%s port=%s \ n", ipaddr,port);

}
sprintf (Addrname, "%s", ipaddr);
sprintf (Addrport, "%s", port);
Fclose (FILE_FA);
return 1;
}
int main (int argc,char **argv)
{
int CLI_SOCKFD;
int Len;
Socklen_t Addrlen;
Char seraddr[14];
Char serport[14];
struct sockaddr_in cli_addr;
Char buffer[256];

GETSERVERADDR (Seraddr,serport);
printf ("getserveraddr=%s,port=%s\n", Seraddr,serport);

/* Build socket*/
Cli_sockfd=socket (af_inet,sock_dgram,0);
if (cli_sockfd<0)
{
printf ("I cannot socket success\n");
return 1;
}

/* Fill in sockaddr_in*/
addrlen=sizeof (struct sockaddr_in);
Bzero (&cli_addr,addrlen);
Cli_addr.sin_family=af_inet;
CLI_ADDR.SIN_ADDR.S_ADDR=INET_ADDR (SERADDR);//Convert string to IPV4 address of 32-bit binary network byte order
Cli_addr.sin_addr.s_addr=htonl (Inaddr_any);
Cli_addr.sin_port=htons (Atoi (Serport));//host byte order translates to network byte order
Cli_addr.sin_port=htons (Server_port);

Bzero (buffer,sizeof (buffer));
/* Get string from standard input device */
Len=read (stdin_fileno,buffer,sizeof (buffer));
sprintf (buffer, "%s", "Nihao");
len = sizeof (buffer) +1;
/* Send string to server side */
while (1)
{
printf ("sendword=%s\n", buffer);
SendTo (cli_sockfd,buffer,len,0, (struct sockaddr*) &cli_addr,addrlen);
Sleep (2);
}
/* Receive the server-side returned string */
Len=recvfrom (cli_sockfd,buffer,sizeof (buffer), 0, (struct sockaddr*) &cli_addr,&addrlen);
printf ("Receive from%s\n", Inet_ntoa (CLI_ADDR.SIN_ADDR));
printf ("Receive:%s", buffer);
Close (CLI_SOCKFD);
}

Sends a UDP packet to the specified port on the specified server