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Need windows TCP/IP library that allow specific local port for outgoing bind
Been looking for this for a while. I need a library that allow you to set the local port number when creating an outgoing TCP connection. Winsock won't do it because it always assign a random local port when binding. Thanks in advance!
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Answers
How about:
http://www.cpp-home.com/tu
?
It's a shame you're not using .NET for this... it's easy with that.
>>Winsock won't do it because it always assign a random local port when binding
Not true.
The correct sequence of calls is :-
1. socket() to get a socket
1a. setsockopt() to set any optional parameters
2. bind() to set the local address and local port
3. connect() to connect to the destination
see the Bind() funtion in the WinSock Platform SDK on msdn.microsoft.com
If i remember my studies correctly binding an outgoing to a specific port can cause problematic situations. Binding usually only occurs on a listener and the sender grabs whatever is avaliable. (since most of the time the port number will be locked when you release it for about 255 seconds).
C++ works on windows and unix so why will InteractiveMind's solution not work?
If you do not want it in C++ what language are you using?
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by: giltjrPosted on 2006-01-09 at 19:35:21ID: 15656896
I'm not a Windows programmer but normally when you get a randmon port it means that you did not specify a specific port. I mean Web browers that run on Windows specific port when they run, Ftp servers get specific ports when they start, telnet servers get specific ports when they run.
Are you specificing a specific port to use when you do the bind?