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Linux: get socket source port used after connect()

Posted on 2008-06-21
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Last Modified: 2010-04-21
Hello, in Linux, how can I get the source port used by a socket after making a call to the connect system call? I want to save the source port used for later use.
Alternatively, how can I find out which source ports are not used, then I could just make a call to bind with that source port.

thanks
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Question by:rocketsbay
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Accepted Solution

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Duncan Roe earned 75 total points
ID: 21839437
Use getsockname() and cast the returned sockaddr to sockaddr_in. It then contains the port & IP.
getpeername() gets the remote port & IP.
To find an unused port, you have to call bind() on different ones until you don't get an error. Or you can call bind with a zero port and discover what port you got.
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Author Closing Comment

by:rocketsbay
ID: 31469442
Thanks a lot, it`s exactly what I need.
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