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Bug#907805: syslinux.efi uses the TFTP server IP for the HTTP domain

Hi Marco,

On Sun, 2 Sep 2018 14:08:09 +0200
Marco d'Itri <md@linux.it> wrote:

> When providing to syslinux.efi an http URL in option 67:
> dhcp-option=option:bootfile-name,http://pxe.example.net/EFI/SYSLINUX/syslinux.efi
> then it will try to download the modules like ldlinux.e64, the 
> configuration file and the payload by sending an HTTP request to the 
> TFTP server address (with pxe.example.net as virtual host) instead of 
> resolving pxe.example.net and using that IP as expected.

I checked the source code and found that efi network support was added
The commit mentions in the TODO part that DNS resolve code is still

This still seems to be the case, since the pxe_dns function in efi/pxe.c
in the current HEAD
(http://repo.or.cz/syslinux.git/blob/HEAD:/efi/pxe.c, lines 38-49) will
`return 0` in all cases.

The connection to your TFTP server address is the fallback behavior
that's implemented for DNS resolve failures in core/fs/pxe/pxe.c
(http://repo.or.cz/syslinux.git/blob/HEAD:/core/fs/pxe/pxe.c, lines

I will do a bit of testing and then forward your report to upstream.


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