UDPListener

UDPListener.cpp

#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include <errno.h>
#include <string.h>
#include <sys/types.h>
#include <sys/socket.h>
#include <netinet/in.h>
#include <arpa/inet.h>

#define MYPORT 11000
#define MAXBUFLEN 512

extern "C" {
        // yoksa derlemiyor
int main(void)
{
        int sockfd;
        struct sockaddr_in my_addr;
        struct sockaddr_in their_addr;
        socklen_t addr_len;
        int numbytes;
        char buf[MAXBUFLEN];

        if ((sockfd = socket(AF_INET, SOCK_DGRAM, 0)) == -1) {
                perror("socket");
                exit(1);
        }

        my_addr.sin_family = AF_INET;
        my_addr.sin_addr.s_addr = INADDR_ANY;
        my_addr.sin_port = htons(MYPORT);
        memset(&(my_addr.sin_zero), '\0', 8);

        if (bind(sockfd, (struct sockaddr *)&my_addr,
                sizeof(struct sockaddr)) == -1) {
                perror("bind");
                exit(1);
        }

        addr_len = sizeof(struct sockaddr);
        while(numbytes = recvfrom(sockfd, buf, MAXBUFLEN-1 , 0,
                (struct sockaddr *)&their_addr, &addr_len) ) {
        printf("got packet from %s\n",inet_ntoa(their_addr.sin_addr));
        printf("packet is %d bytes long\n",numbytes);
        buf[numbytes] = '\0';
        printf("packet contains \"%s\"\n",buf);
                }
        close(sockfd);

        return 0;
}
}