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POHow to make an network-ip scan in c++?
 

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  1. POHow to make an network-ip scan in c++?
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    <p>I am experimenting with C++ winsockets. I want to create a method with which I can find the server on the network, without knowing it's IP. To do this I simply loop my connect method through IP adresses 192.168.1.0 to 192.168.1.255. However, the time between each connect is quite large, the program tends to wait at the: connect(nBytes, (sockaddr*)&amp;server, sizeof(server)) statement for at least 30 seconds if not longer. My questions are the following: Why is this happening, how can I solve this and might there be an entirely different, better way to find the server?</p> <p>my connect method:</p> <pre><code>SOCKET connect(char *ipAdress) { WSAData wsaData; if ((WSAStartup(MAKEWORD(2, 2), &amp;wsaData)) == SOCKET_ERROR) return errorReport("Could not create startup struct"); nBytes = socket(AF_INET, SOCK_STREAM, 0); if (nBytes == SOCKET_ERROR) return errorReport("Socket could not be created"); struct hostent *host_entry; if ((host_entry = gethostbyname(ipAdress)) == NULL) return errorReport("Cannot find server."); struct sockaddr_in server; server.sin_family = AF_INET; server.sin_port = htons(1337); server.sin_addr.s_addr = *(unsigned long*) host_entry-&gt;h_addr; if (connect(nBytes, (sockaddr*)&amp;server, sizeof(server)) == SOCKET_ERROR) { WSACleanup(); return errorReport("Failed to connect to server."); } if (nBytes == -1) { WSACleanup(); disconnect(nBytes); return errorReport("Could not connect"); } return 0; } </code></pre> <p>Also, feel free to tell me anything I'm doing wrong in the current connect method.</p>
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