Sorry, forgot to attach the C++ example.
-Aron
On Tue, Apr 21, 2009 at 2:22 PM, Aron Bierbaum <aronbierb...@gmail.com> wrote:
> I have been able to reproduce the same results with a simple C++
> example. I have been unable to find any specific reason why binding to
> "127.0.0.1" and later calling getsockname would result in a different
> address of "0.0.0.0" I did find one reference [1] that said that using
> a port number of 0 will cause the operating system to listen on all
> interfaces and that calling getsockname may not return a valid address
> until the socket is fully connected. It might be best to use the
> original patch that I sumbitted that only uses the port value from the
> getsockname call, and uses the correct "127.0.0.1" IP address
> regardless of the reported address. If the address returned is really
> undefined, then this could be causing the problem.
>
> -Aron
>
> [1] http://www.sockets.com/winsock.htm#Bind
>
> [2] Change the following line in posixbase.py
>
> client.connect(server.getsockname())
>
> to
>
> client.connect(('127.0.0.1', server.getsockname()[1]))
>
> On Mon, Apr 20, 2009 at 7:06 PM, Jean-Paul Calderone <exar...@divmod.com>
> wrote:
>> On Mon, 20 Apr 2009 18:16:39 -0500, Aron Bierbaum <aronbierb...@gmail.com>
>> wrote:
>>>
>>> I have looked into this a little more and have noticed that if I
>>> specify a port number instead of "0" it will always bind to the
>>> correct "127.0.0.1" address. I still don't know why this only occurs
>>> on certain Windows machines. I will hopefully get more time to look
>>> into this in the next couple of days.
>>
>> Hmm. Interesting. Perhaps we could bind a different port, then.
>> I look forward to results from your further investigations.
>>
>> Jean-Paul
>>
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>
#include <stdio.h>
#include "winsock2.h"
#include <iostream>
// Try to create a socket, bind to 127.0.0.1, and get the socket name.
void createSocket()
{
// Create a SOCKET for listening for incoming connection requests
SOCKET ListenSocket;
ListenSocket = socket(AF_INET, SOCK_STREAM, IPPROTO_TCP);
if (ListenSocket == INVALID_SOCKET)
{
std::cout << "Error at socket(): " << WSAGetLastError() << std::endl;
WSACleanup();
return;
}
// The sockaddr_in structure specifies the address family,
// IP address, and port for the socket that is being bound.
sockaddr_in service;
service.sin_family = AF_INET;
service.sin_addr.s_addr = inet_addr("127.0.0.1");
service.sin_port = htons(0);
//printf("b4 bind : %d.%d.%d.%d\n", service.sin_addr.S_un.S_un_b.s_b1,
// service.sin_addr.S_un.S_un_b.s_b2,
// service.sin_addr.S_un.S_un_b.s_b3,
// service.sin_addr.S_un.S_un_b.s_b4);
// Bind the socket.
if (SOCKET_ERROR == bind( ListenSocket, (SOCKADDR*) &service,
sizeof(service)))
{
printf("bind() failed.\n");
closesocket(ListenSocket);
return;
}
//listen(ListenSocket, 5);
int name_len;
sockaddr outname;
name_len = sizeof (struct sockaddr_in);
memset(&outname, 0, name_len);
getsockname(ListenSocket, &outname, &name_len);
// Get the port number.
struct sockaddr_in* get_port = (sockaddr_in*)&outname;
int port = ntohs(get_port->sin_port);
if (outname.sa_data[2] == 0 && 0 == outname.sa_data[3]&& 0 ==
outname.sa_data[3]&& 0 == outname.sa_data[3])
{
std::cout << "Bound to wrong address." << std::endl;
// Display the address.
printf("Address %d.%d.%d.%d:%d\n", outname.sa_data[2], outname.sa_data[3],
outname.sa_data[4],
outname.sa_data[5], port);
}
closesocket(ListenSocket);
return;
}
void main()
{
// Initialize Winsock
WSADATA wsaData;
if (NO_ERROR != WSAStartup(MAKEWORD(2,2), &wsaData))
{
printf("Error at WSAStartup()\n");
}
// Try to create a socket, bind to 127.0.0.1, and get the socket name.
for (int i = 0; i < 100; ++i)
{
createSocket();
}
// Cleanup Winsock
WSACleanup();
}
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