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#include <stdio.h> | |
#include <stdlib.h> | |
#include <string.h> | |
#include <unistd.h> | |
#include <arpa/inet.h> | |
#define MAX_LEN 1024 // Maximum message length | |
int main() { | |
int sockfd; | |
struct sockaddr_in addr; | |
struct ip_mreq mreq; | |
char buffer[MAX_LEN + 1]; | |
int bytes_received; | |
// Create a UDP socket | |
if ((sockfd = socket(AF_INET, SOCK_DGRAM, IPPROTO_UDP)) < 0) { | |
perror("socket creation failed"); | |
exit(EXIT_FAILURE); | |
} | |
memset(&addr, 0, sizeof(addr)); | |
// Fill in the address structure | |
addr.sin_family = AF_INET; | |
addr.sin_addr.s_addr = htonl(INADDR_ANY); // Listen on any interface | |
addr.sin_port = htons(12345); // Choose any port number you like | |
// Bind the socket to the address | |
if (bind(sockfd, (struct sockaddr *)&addr, sizeof(addr)) < 0) { | |
perror("bind failed"); | |
exit(EXIT_FAILURE); | |
} | |
// Specify the multicast group to join | |
mreq.imr_multiaddr.s_addr = inet_addr("224.0.0.251"); // Multicast group address | |
mreq.imr_interface.s_addr = htonl(INADDR_ANY); // Listen on any interface | |
// Join the multicast group | |
if (setsockopt(sockfd, IPPROTO_IP, IP_ADD_MEMBERSHIP, (char *)&mreq, sizeof(mreq)) < 0) { | |
perror("setsockopt"); | |
exit(EXIT_FAILURE); | |
} | |
// Receive multicast messages | |
while (1) { | |
bytes_received = recvfrom(sockfd, buffer, MAX_LEN, 0, NULL, NULL); | |
if (bytes_received < 0) { | |
perror("recvfrom failed"); | |
exit(EXIT_FAILURE); | |
} | |
buffer[bytes_received] = '\0'; // Null-terminate the received data | |
printf("Received message: %s\n", buffer); | |
} | |
// Close the socket | |
close(sockfd); | |
return 0; | |
} |
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