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From: karl@aspodata.se
To: gentoo-user@lists.gentoo.org
Subject: Re: [gentoo-user] How to generate broadcast TFTP read request?
In-reply-to: <vgivit$t30$1@ciao.gmane.io>
References: <vgivit$t30$1@ciao.gmane.io>
Comments: In-reply-to Grant Edwards <grant.b.edwards@gmail.com>
   message dated "Thu, 07 Nov 2024 18:06:21 +0000."
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Grant Edwards:
> I need to generate a broadcast UDP TFTP read request, and the usual
> TFTP client tools I use (atftp, tftpy) can't do that.  Does anybody
> have a suggestion for an easy wat to generate such a request?
...

 Tftp is specified by:
https://www.rfc-editor.org/rfc/rfc1350.txt

 To send datagrams to the broadcast address, you need to
 set SO_BROADCAST in setsockopt(), so unpatched the traditional
 clients won't work. For details see:
  man 7 socket
  man setsockopt

 Theese might help:
https://www.abc.se/~m6695/udp.html
https://people.cs.rutgers.edu/~pxk/417/notes/sockets/udp.html
https://users.cs.jmu.edu/bernstdh/web/common/lectures/summary_unix_udp.php

Regards,
/Karl Hammar