#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include <arpa/inet.h>
#include <sys/socket.h>
#define BUF_SIZE 1024
#define PUBLISHER_PORT 9190
#define PUBLISHER_IP "255.255.255.255"
class Publisher
{
public:
Publisher() = default;
~Publisher() {
close(publisher_sock);}
bool publisherinit()
{
publisher_sock = socket(PF_INET, SOCK_DGRAM, 0);
if(publisher_sock == -1)
{
return false;
}
memset(&broad_addr, 0, sizeof(broad_addr));
broad_addr.sin_family = AF_INET;
broad_addr.sin_addr.s_addr = inet_addr("255.255.255.255");
broad_addr.sin_port = htons(PUBLISHER_PORT);
if(setsockopt(publisher_sock, SOL_SOCKET, SO_BROADCAST, (void*)&broadcast_opation, sizeof(broadcast_opation)) == -1)
{
return false;
}
return true;
}
int send_msg()
{
int send_length = 0;
while(1)
{
send_length = sendto(publisher_sock, buf, strlen(buf), 0, (struct sockaddr*)&broad_addr, sizeof(broad_addr));
if(send_length < 0)
{
printf("send error\n");
return -1;
}
sleep(2);
}
return 0;
}
private:
int publisher_sock;
int broadcast_opation = 1;
struct sockaddr_in broad_addr;
char buf[BUF_SIZE] = {
'a'};
};
int main(int argc, char *argv[])
{
Publisher pub;
pub.publisherinit();
pub.send_msg();
return 0;
}
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include <arpa/inet.h>
#include <sys/socket.h>
#define BUF_SIZE 1024
#define SUBSCRIBER_PORT 9190
class Subscriber
{
public:
Subscriber() = default;
~Subscriber(){
close(subsceiber_sock); }
public:
bool subscriberinit()
{
if((subsceiber_sock = socket(PF_INET, SOCK_DGRAM, 0)) == -1)
{
return false;
}
if(setsockopt(subsceiber_sock, SOL_SOCKET, SO_REUSEADDR, (const void*)&port_reuse_option, sizeof(port_reuse_option)) == -1)
{
return false;
}
memset(&addr, 0, sizeof(addr));
addr.sin_family=AF_INET;
addr.sin_addr.s_addr=htonl(INADDR_ANY);
addr.sin_port=htons(SUBSCRIBER_PORT);
if(bind(subsceiber_sock, (struct sockaddr*)&addr, sizeof(addr)) == -1)
{
printf("bind() error\n");
return false;
}
return true;
}
int recv_msg()
{
while(1)
{
str_length = recvfrom(subsceiber_sock, buf, BUF_SIZE - 1, 0, NULL, 0);
if(str_length < 0)
{
break;
}
buf[str_length] = 0;
printf("%s\n",buf);
printf("%s\n",buf);
}
return str_length;
}
private:
int subsceiber_sock;
struct sockaddr_in addr;
int str_length , port_reuse_option ;
char buf[BUF_SIZE];
};
int main(int argc, char *argv[])
{
Subscriber sub;
sub.subscriberinit();
sub.recv_msg();
return 0;
}
int send_sock;
struct sockaddr_in broad_adr;
FILE *fp;
char buf[BUF_SIZE];
int so_brd=1;
if(argc!=3) {
printf("Usage : %s <Boradcast IP> <PORT>\n", argv[0]);
exit(1);
}
send_sock=socket(PF_INET, SOCK_DGRAM, 0);
memset(&broad_adr, 0, sizeof(broad_adr));
broad_adr.sin_family=AF_INET;
broad_adr.sin_addr.s_addr=inet_addr(argv[1]);
broad_adr.sin_port=htons(atoi(argv[2]));
setsockopt(send_sock, SOL_SOCKET,
SO_BROADCAST, (void*)&so_brd, sizeof(so_brd));
if((fp=fopen("news.txt", "r"))==NULL)
error_handling("fopen() error");
while(!feof(fp))
{
fgets(buf, BUF_SIZE, fp);
sendto(send_sock, buf, strlen(buf),
0, (struct sockaddr*)&broad_adr, sizeof(broad_adr));
sleep(2);
}
close(send_sock);