Spoiler

C/C++-Quelltext

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59

#include <stdio.h> /* for printf(), fprintf() */ #include <windows.h> /* for socket(),... */ #include <stdlib.h> /* for exit() */ #include <string.h> #pragma comment (lib, "Ws2_32.lib") int main() { int sock; /* Socket */ struct sockaddr_in broadcastAddr; /* Broadcast address */ char *broadcastIP; /* IP broadcast address */ unsigned short broadcastPort; /* Server port */ char *sendString; /* String to broadcast */ int broadcastPermission; /* Socket opt to set permission to broadcast */ unsigned int sendStringLen; /* Length of string to broadcast */ WSADATA wsaData; /* Structure for WinSock setup communication */ broadcastIP = "255.255.255.255"; /* broadcast IP address */ broadcastPort = atoi("12345"); /* broadcast port */ sendString = "TEST"; /* string to broadcast */ if (WSAStartup(MAKEWORD(2, 0), &wsaData) != 0) /* Load Winsock 2.0 DLL */ { printf( "WSAStartup() failed"); } /* Create socket for sending/receiving datagrams */ if ((sock = socket(AF_INET, SOCK_DGRAM, IPPROTO_UDP)) < 0) /* Set socket to allow broadcast */ broadcastPermission = 1; if (setsockopt(sock, SOL_SOCKET, SO_BROADCAST, (void *) &broadcastPermission, sizeof(broadcastPermission)) < 0) /* Construct local address structure */ memset(&broadcastAddr, 0, sizeof(broadcastAddr)); /* Zero out structure */ broadcastAddr.sin_family = AF_INET; /* Internet address family */ broadcastAddr.sin_addr.s_addr = inet_addr(broadcastIP);/* Broadcast IP address */ broadcastAddr.sin_port = htons(broadcastPort); /* Broadcast port */ sendStringLen = strlen(sendString); /* Find length of sendString */ for (;;) { // Broadcast sendString in datagram to clients every 3 seconds if (sendto(sock, sendString, sendStringLen, 0, (struct sockaddr *) &broadcastAddr, sizeof(broadcastAddr)) != sendStringLen) printf("Nachricht: %s",sendString); Sleep(3000); //Avoids flooding the network } /* NEVER REACHED */ }