kopia lustrzana https://github.com/Hamlib/Hamlib
111 wiersze
2.4 KiB
C
111 wiersze
2.4 KiB
C
#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <errno.h>
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#include <unistd.h>
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#ifdef _WIN32
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#include <winsock2.h>
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#include <ws2tcpip.h>
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#pragma comment(lib, "Ws2_32.lib")
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#else
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#include <arpa/inet.h>
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#include <netinet/in.h>
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#include <sys/socket.h>
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#include <sys/types.h>
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#endif
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#define MCAST_PORT 4532
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#define MCAST_ADDR "224.0.0.1"
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#define BUFFER_SIZE 4096
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int main()
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{
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int sock;
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struct sockaddr_in mcast_addr;
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char buffer[BUFFER_SIZE];
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int bytes_received;
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#ifdef _WIN32
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WSADATA wsaData;
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if (WSAStartup(MAKEWORD(2, 2), &wsaData) != 0)
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{
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fprintf(stderr, "WSAStartup failed: %d\n", WSAGetLastError());
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return 1;
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}
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#endif
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if ((sock = socket(AF_INET, SOCK_DGRAM, IPPROTO_UDP)) < 0)
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{
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perror("socket() failed");
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exit(EXIT_FAILURE);
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}
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// Set the SO_REUSEADDR option to allow multiple processes to use the same address
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int optval = 1;
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if (setsockopt(sock, SOL_SOCKET, SO_REUSEADDR, (char *)&optval,
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sizeof(optval)) < 0)
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{
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//rig_debug(RIG_DEBUG_ERR, "%s: setsockopt: %s\n", __func__, strerror(errno));
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//return -RIG_EIO;
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return 1;
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}
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memset(&mcast_addr, 0, sizeof(mcast_addr));
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mcast_addr.sin_family = AF_INET;
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mcast_addr.sin_port = htons(MCAST_PORT);
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mcast_addr.sin_addr.s_addr = htonl(INADDR_ANY);
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if (bind(sock, (struct sockaddr *)&mcast_addr, sizeof(mcast_addr)) < 0)
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{
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perror("bind() failed");
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exit(EXIT_FAILURE);
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}
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struct ip_mreq mreq;
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mreq.imr_multiaddr.s_addr = inet_addr(MCAST_ADDR);
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mreq.imr_interface.s_addr = htonl(INADDR_ANY);
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if (setsockopt(sock, IPPROTO_IP, IP_ADD_MEMBERSHIP, (char *)&mreq,
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sizeof(mreq)) < 0)
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{
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perror("setsockopt() failed");
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exit(EXIT_FAILURE);
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}
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while (1)
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{
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bytes_received = recvfrom(sock, buffer, BUFFER_SIZE, 0, NULL, 0);
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if (bytes_received < 0)
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{
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perror("recvfrom() failed");
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break;
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}
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buffer[bytes_received] = '\0';
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printf("Received: %s\n", buffer);
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}
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// Drop membership before closing the socket
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if (setsockopt(sock, IPPROTO_IP, IP_DROP_MEMBERSHIP, (char *)&mreq,
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sizeof(mreq)) < 0)
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{
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perror("setsockopt() failed");
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}
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close(sock);
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#ifdef _WIN32
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WSACleanup();
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#endif
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return 0;
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}
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