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POC WINAPI recv() returns 0 before all data is recieved
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  1. POC WINAPI recv() returns 0 before all data is recieved
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    copied!<p>I'm using the code from <a href="http://msdn.microsoft.com/en-us/library/windows/desktop/ms740121%28v=vs.85%29.aspx" rel="nofollow">MSDN's recv() page</a>, but I changed the data being sent and destination port and IP address to send a HTTP GET request to get google.com/index.php. Every time I run it, recv() returns 0 after getting most of the page, but not all. I verified with wireshark that the entire page is received, but it stops after <code>&lt;a href=//google.co</code>, followed by a non-ASCII symbol.</p> <p>Here's the code I'm using, I took out most of the comments and error checking but otherwise it's the same as the link above:</p> <pre><code>#include &lt;winsock2.h&gt; #include &lt;ws2tcpip.h&gt; #include &lt;stdio.h&gt; int main() { WSADATA wsaData; int iResult; SOCKET ConnectSocket = INVALID_SOCKET; struct sockaddr_in clientService; char *sendbuf = "GET /index.php\r\nHost: www.google.com\r\n\r\n"; char recvbuf[512]; int recvbuflen = 512; iResult = WSAStartup(MAKEWORD(2,2), &amp;wsaData); ConnectSocket = socket(AF_INET, SOCK_STREAM, IPPROTO_TCP); clientService.sin_family = AF_INET; clientService.sin_addr.s_addr = inet_addr( "74.125.224.180" ); clientService.sin_port = htons( 80 ); iResult = connect( ConnectSocket, (SOCKADDR*) &amp;clientService, sizeof(clientService) ); iResult = send( ConnectSocket, sendbuf, (int)strlen(sendbuf), 0 ); printf("Bytes Sent: %ld\n", iResult); // shutdown the connection since no more data will be sent iResult = shutdown(ConnectSocket, SD_SEND); if (iResult == SOCKET_ERROR) { printf("shutdown failed: %d\n", WSAGetLastError()); closesocket(ConnectSocket); WSACleanup(); return 1; } // Receive until the peer closes the connection do { iResult = recv(ConnectSocket, recvbuf, recvbuflen, 0); if ( iResult &gt; 0 ){ printf("%512s", recvbuf); //printf("recv returned %d... got %d bytes\n", iResult, recvbuflen); } else if ( iResult == 0 ) printf("\n\nConnection closed\n"); else printf("\n\nrecv failed: %d\n", WSAGetLastError()); } while( iResult &gt; 0 ); // cleanup closesocket(ConnectSocket); WSACleanup(); return 0; } </code></pre> <p>I'm compiling on linux with mingw32 version 4.2.1.</p>
 

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