* [gentoo-user] How to generate broadcast TFTP read request?
@ 2024-11-07 18:06 Grant Edwards
2024-11-08 3:44 ` Alexis
2024-11-08 8:54 ` karl
0 siblings, 2 replies; 4+ messages in thread
From: Grant Edwards @ 2024-11-07 18:06 UTC (permalink / raw
To: gentoo-user
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?
All I need is to generate the initial request. I don't need to handle
the actual data.
^ permalink raw reply [flat|nested] 4+ messages in thread
* Re: [gentoo-user] How to generate broadcast TFTP read request?
2024-11-07 18:06 [gentoo-user] How to generate broadcast TFTP read request? Grant Edwards
@ 2024-11-08 3:44 ` Alexis
2024-11-08 8:54 ` karl
1 sibling, 0 replies; 4+ messages in thread
From: Alexis @ 2024-11-08 3:44 UTC (permalink / raw
To: gentoo-user
Grant Edwards <grant.b.edwards@gmail.com> writes:
> 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?
>
> All I need is to generate the initial request. I don't need to
> handle
> the actual data.
Use the Python `socket` module?
https://wiki.python.org/moin/UdpCommunication
Alexis.
^ permalink raw reply [flat|nested] 4+ messages in thread
* Re: [gentoo-user] How to generate broadcast TFTP read request?
2024-11-07 18:06 [gentoo-user] How to generate broadcast TFTP read request? Grant Edwards
2024-11-08 3:44 ` Alexis
@ 2024-11-08 8:54 ` karl
2024-11-08 13:59 ` [gentoo-user] " Grant Edwards
1 sibling, 1 reply; 4+ messages in thread
From: karl @ 2024-11-08 8:54 UTC (permalink / raw
To: gentoo-user
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
^ permalink raw reply [flat|nested] 4+ messages in thread
* [gentoo-user] Re: How to generate broadcast TFTP read request?
2024-11-08 8:54 ` karl
@ 2024-11-08 13:59 ` Grant Edwards
0 siblings, 0 replies; 4+ messages in thread
From: Grant Edwards @ 2024-11-08 13:59 UTC (permalink / raw
To: gentoo-user
On 2024-11-08, karl@aspodata.se <karl@aspodata.se> wrote:
> 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
I hacked up a version of tftpy so that it checked the destination
address and set the SO_BROADCAST flag when sending the request. That
did what I needed.
--
Grant
^ permalink raw reply [flat|nested] 4+ messages in thread
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2024-11-07 18:06 [gentoo-user] How to generate broadcast TFTP read request? Grant Edwards
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2024-11-08 13:59 ` [gentoo-user] " Grant Edwards
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