UDP Programming for client
#include<stdio.h>
#include<sys/ipc.h>
#include<sys/socket.h>
#include<sys/stat.h>
#include<stdlib.h>
#include<netinet/in.h>
#include<string.h>
main(int argc,char **argv)
{
int sd,newsd,ret;
socklen_t len;
char buf[20];
struct sockaddr_in cAddr,sAddr;
sd=socket(PF_INET,SOCK_DGRAM,0);
if(sd==-1)
{
perror("socket");
return;
}
sAddr.sin_family=PF_INET;
sAddr.sin_port=htons(atoi(argv[2]));
sAddr.sin_addr.s_addr=inet_addr(argv[1]);
while(1)
{
printf("enter msg:");
scanf("%s",buf);
sendto(sd,buf,strlen(buf),0,(struct sockaddr*)&sAddr,sizeof(sAddr));
printf("connect successful\n");
}
close(sd);
}
UDP Programming for Server
#include<stdio.h>
#include<sys/ipc.h>
#include<sys/socket.h>
#include<sys/stat.h>
#include<stdlib.h>
#include<netinet/in.h>
#include<string.h>
main(int argc,char **argv)
{
int sd,newsd,ret;
socklen_t len;
char buf[20];
struct sockaddr_in cAddr,sAddr;
sd=socket(PF_INET,SOCK_DGRAM,0);
if(sd==-1)
{
perror("socket");
return;
}
sAddr.sin_family=PF_INET;
sAddr.sin_port=htons(atoi(argv[1]));
sAddr.sin_addr.s_addr=inet_addr("0.0.0.0");
if(bind(sd,(struct sockaddr*)&sAddr,sizeof(sAddr))==-1)
perror("bind");
else
printf("bind sucess\n");
while(1)
{
printf("waiting for message....\n");
bzero(buf,20);
socklen_t y=sizeof(cAddr);
recvfrom(sd,buf,20,0,(struct sockaddr *)&cAddr,&y);
printf("%s %s\n",inet_ntoa(cAddr.sin_addr.s_addr),buf);
}
close(sd);
close(newsd);
}
