udp client server

protocol UDP -> client server

http://github.com/shfx17


// CLIENT

#include <stdio.h>
#include <stdlib.h>
#include <errno.h>
#include <sys/socket.h>
#include <netinet/in.h>
#include <string.h>
#define MAXLINE 4096
int main(int argc, char **argv)
{
int sockfd,n;
char recvline[MAXLINE+1],buff[MAXLINE+1];
struct sockaddr_in servaddr;
if((sockfd = socket(AF_INET,SOCK_DGRAM,0))<0)
puts("Socket error");
bzero(&servaddr, sizeof(servaddr));
servaddr.sin_family = AF_INET;
if(inet_pton(AF_INET, argv[1],&servaddr.sin_addr)<0)
puts("Problem z formatem");
else
printf("Address %s\n",argv[1]);
if((servaddr.sin_port = htons(atoi(argv[2])))<0)
printf("Zły format PORT");
else
printf("Port polaczenia %d\n",servaddr.sin_port);
while(1){
bzero(buff,sizeof(buff));
puts("Wyslij wiadomosc:");
if(fgets (buff, sizeof(buff), stdin) != NULL)
{
if(sendto(sockfd,buff,strlen(buff), 0, (struct sockaddr *)&servaddr, sizeof(servaddr))<0)
puts("Blad sendto");
else
{
printf("Wysłano: %s\n",buff);
}
recvline[n]=0;
if((recvfrom(sockfd,recvline, MAXLINE, 0, NULL, NULL))<0)
puts("recvfrom error");
printf("Otrzymałem: %s\n", recvline);
if(fputs(recvline, stdout) == EOF)
puts("Nie dziala fputs");
if(n < 0)
puts("Read error");
}
if(close(sockfd)<0){
puts("Close sockfd");
}
 return 0;
}




// SERVER

#include <stdio.h>
#include<stdlib.h>
#include <errno.h>
#include <sys/types.h>
#include<sys/socket.h>
#include<netinet/in.h>
#include<string.h>
#define MAXLINE 4096
#define LISTENQ 1024
int main (int argc, char **argv)
{
int listenfd;
int len;
struct sockaddr_in servaddr, cliaddr;
char buff[MAXLINE],recvline[MAXLINE],z;
if(argc !=2)
puts("Serverport");
if((listenfd = socket (AF_INET, SOCK_DGRAM, 0 ))<0)
puts("Socket error");
int nn= 240*1024;
setsockopt(listenfd, SOL_SOCKET, SO_RCVBUF, &nn, sizeof(nn));
bzero(&servaddr, sizeof(servaddr));
servaddr.sin_family = AF_INET;
servaddr.sin_addr.s_addr = htonl(INADDR_ANY);
if((servaddr.sin_port = htons (atoi(argv[1])))<0)
puts("Zły port");
if(bind(listenfd, (struct sockaddr *) &servaddr, sizeof(servaddr))<0)
puts("Bind error");
while(1)
{
len = sizeof(cliaddr);
if((recvfrom (listenfd, recvline, MAXLINE, 0 ,(struct sockaddr* )&cliaddr, &len))>0)
{
printf("Otrzymałem: %s \n",recvline);
 int i, j;
puts("***********************");
 for(i = strlen(recvline) - 1, j = 0; i >= 0; i--, j++) {
 buff[j] = recvline[i];
 }
 printf("Wysylam odpowiedz: %s\n", buff);
 sendto(listenfd, buff, sizeof(buff), 0, (struct sockaddr *)&cliaddr, len);
}
}
if(close(listenfd) == -1)
puts("Bład zamkniecia");
return 0;
}