UDP source port

[slaskbrev1@gmail.com]

Hi.
Im sending data over a SOCK_DGRAM socket, is it possible to define
what source port my program will use?
I guess one alternative is to craft the UDP header by myself, what
type of socket would I use then? Do I have to craft the IP header
aswell and use SOCK_RAW?

Thanks

[Antoninus Twink]

Re: UDP source port

On 17 Apr 2008 at 9:34, slaskbrev1@gmai l.com wrote:

Im sending data over a SOCK_DGRAM socket, is it possible to define
what source port my program will use?

Yes - just set the sin_port field of the struct sockaddr *address
argument you give to bind(). (The default value of 0 for sin_port just
means "pick any available port".)

[slaskbrev1@gmail.com]

Re: UDP source port

On 17 Apr, 12:43, Antoninus Twink <nos...@nospam. invalidwrote:

On 17 Apr 2008 at 9:34, slaskbr...@gmai l.com wrote:
>

Im sending data over a SOCK_DGRAM socket, is it possible to define
what source port my program will use?

>
Yes - just set the sin_port field of the struct sockaddr *address
argument you give to bind(). (The default value of 0 for sin_port just
means "pick any available port".)

Thanks. It bothers me I didnt figure that out myself. :)

[Keith Thompson]

Re: UDP source port

slaskbrev1@gmai l.com writes:

Im sending data over a SOCK_DGRAM socket, is it possible to define
what source port my program will use?
I guess one alternative is to craft the UDP header by myself, what
type of socket would I use then? Do I have to craft the IP header
aswell and use SOCK_RAW?

Please ask in a newsgroup that discusses your operating system,
perhaps comp.unix.progr ammer or one of the Windows groups.

--
Keith Thompson (The_Other_Keit h) <kst-u@mib.org>
Nokia
"We must do something. This is something. Therefore, we must do this."
-- Antony Jay and Jonathan Lynn, "Yes Minister"

[ionic]

Re: UDP source port

Call bind() right after socket(), specify your local port and NIC
adapter in sockaddr_in.