setsockopt error code 10049.

Question

1.00/5 (1 vote)

See more:

What is wrong with following code:

C++

IGDDiscoverProcess::IGDDiscoverResult IGDDiscoverProcess::InitializeUDPConnection( void )
{
	int error(0);

	pimpl->sock = socket( 
		AF_INET, SOCK_DGRAM, 0
		);
	if( INVALID_SOCKET == pimpl->sock )
	{
		BHDebug( 
			false
			, L"socket had returned a invalid socket." );
		return InvalidSocket;
	}

	sockaddr_in addr = {0};
	addr.sin_family = AF_INET;
	addr.sin_addr.s_addr = htonl(INADDR_ANY);
	u_short port = 20000;
	while( true )
	{
		addr.sin_port = htons( port );
		if( 
			::bind( 
			pimpl->sock, (sockaddr*)&addr, sizeof(addr) ) 
			)
		{
			break;
		}

		error = WSAGetLastError();
		if( WSAEADDRINUSE == error )
		{
			port++;
		}
		else if( 0 != error )
		{
			closesocket( pimpl->sock );
			pimpl->sock = INVALID_SOCKET;
			return Failed;
		}
	}

// ttl/non-blocking setting for m-search
	unsigned int ttl = 4;
	unsigned long flags = 1;
	error = setsockopt(
		pimpl->sock
		, IPPROTO_IP, IP_MULTICAST_IF
		, (char*)(&ttl), sizeof(ttl)
		);
	BHDebug( 0 == error, L"setsockopt error." );
	wchar_t local_buffer[20];
	_itow_s(WSAGetLastError(),local_buffer,20,10);
	BHDebug( 0 == error, local_buffer);

Network error (WSAGetLastError) is "10049" after executing this.

Error is here:

C++

error = setsockopt(
		pimpl->sock
		, IPPROTO_IP, IP_MULTICAST_IF
		, (char*)(&ttl), sizeof(ttl)
		);

What is wrong with this function call?

UPDATE:
This is a part of code from UPnP article from www.codeproject.com .

I have not found any description for setsockopt function usage with option IPPROTO_IP.
Have you know or found any?

Posted 14-Jan-16 19:59pm

Сергей Козлов

Updated 15-Jan-16 1:39am

v5

Add a Solution

Comments

[no name] 15-Jan-16 2:24am

Did you check what the error code means?
https://msdn.microsoft.com/en-us/library/windows/desktop/ms740668(v=vs.85).aspx

Cannot assign requested address.
The requested address is not valid in its context. This normally results from an attempt to bind to an address that is not valid for the local computer.

Jochen Arndt 15-Jan-16 3:46am

You are not specifying a protocol for your socket (when passing zero it is choosen by the service provider). I don't know if this is the reason, but you might try to use IPPROTO_UDP.

Maybe this link is also helpful: http://www.winsocketdotnetworkprogramming.com/winsock2programming/winsock2advancedmulticast9a.html

Сергей Козлов 15-Jan-16 7:34am

Changing to this does not help:

pimpl->sock = socket(
AF_INET, SOCK_DGRAM, IPPROTO_UDP//0
);
Same error in the same place.

Jochen Arndt 15-Jan-16 7:48am

It was just a try.

But I think I found the error and posted a solution.

2 solutions

Solution 1

The error is here:

while( true )
{
    addr.sin_port = htons( port );
    if(
        ::bind(
        pimpl->sock, (sockaddr*)&addr, sizeof(addr) )
        )
    {
        break;
    }
    // ...
}

Your code will loop until bind() fails (returns non-zero) because upon success the following code lines do nothing (error is zero).
So it should be:

if (0 == ::bind(pimpl->sock, (sockaddr*)&addr, sizeof(addr)) 
    break;

Posted 15-Jan-16 1:45am

Jochen Arndt

Comments

Сергей Козлов 15-Jan-16 7:59am

While looking for solution of one error, found 2 errors.

Jochen Arndt 15-Jan-16 8:03am

Indeed. I just saw your solution.

If the errors are also on the page from where you got the code, you should post a comment there (maybe with a link to here).

Сергей Козлов 15-Jan-16 8:08am

In that article on www.codeproject.com are a lot of errors, because it is back to 2004 year.

Сергей Козлов 15-Jan-16 8:12am

Here is the source article:
http://www.codeproject.com/Articles/35853/Portmappings-on-UPnP-NAT-s-using-C-winsock-xerces

Jochen Arndt 15-Jan-16 8:15am

Thank you for the link. I just searched for it but had no success (maybe because that is from 2009).

Jochen Arndt 15-Jan-16 8:12am

That does not excuse these errors. The code should have failed even in 2004.

Add a Solution

Add your solution here

Treat my content as plain text, not as HTML

Preview 0

…

Existing Members

Sign in to your account

...or Join us

Download, Vote, Comment, Publish.

Your Email
Password
Forgot your password?

Your Email
This email is in use. Do you need your password?
Optional Password

I have read and agree to the Terms of Service and Privacy Policy
Please subscribe me to the CodeProject newsletters

When answering a question please:

Read the question carefully.
Understand that English isn't everyone's first language so be lenient of bad spelling and grammar.
If a question is poorly phrased then either ask for clarification, ignore it, or edit the question and fix the problem. Insults are not welcome.
Don't tell someone to read the manual. Chances are they have and don't get it. Provide an answer or move on to the next question.

Let's work to help developers, not make them feel stupid.

This content, along with any associated source code and files, is licensed under The Code Project Open License (CPOL)

Сергей Козлов · Accepted Answer · 2016-01-15T01:51:00

Found the error.
Here should be IP_MULTICAST_TTL option:

C++

// ttl/non-blocking setting for m-search
	unsigned int ttl = 4;
	unsigned long flags = 1;
	error = setsockopt(
		pimpl->sock
		, IPPROTO_IP, IP_MULTICAST_TTL//IP_MULTICAST_IF
		, (char*)(&ttl), sizeof(ttl)
		);

as written here IP Multicasts[^]