Syslinux - Jun 2007 - Support DHCP sname field in PXELINUX

I have discovered that the JUNOS DHCP server in Juniper J-series routers
doesn't support setting the next-server IP address field (I have filed a
bug report with Juniper and they are working on it).  Instead, it puts
the "boot server" in the sname field, which PXELINUX currently
ignores.

Here's a simple patch (vs. 3.36) that will take an IP string in the
field.  My assembly is pretty rusty, and I couldn't quite figure out how
to use the DNS resolver, so it doesn't handle a hostname.  This does
work for me with an IP string.


diff -u syslinux-3.36-dist/pxelinux.asm syslinux-3.36/pxelinux.asm
--- syslinux-3.36-dist/pxelinux.asm	2007-02-10 14:47:08.000000000 -0600
+++ syslinux-3.36/pxelinux.asm	2007-06-28 13:54:15.000000000 -0500
@@ -2056,6 +2056,12 @@
 		mov cx,64
 		call parse_dhcp_options
 .nosnameoverload:
+		cmp byte [si], 0
+		jz .parsed_sname
+		call parse_dotquad
+		jc .parsed_sname
+		mov [ServerIP], eax
+.parsed_sname:
 		ret
 
 ;


-- 
Chris Adams <cmadams at hiwaay.net>
Systems and Network Administrator - HiWAAY Internet Services
I don't speak for anybody but myself - that's enough trouble.

Chris Adams wrote:
> I have discovered that the JUNOS DHCP server in Juniper J-series routers
> doesn't support setting the next-server IP address field (I have filed
a
> bug report with Juniper and they are working on it).  Instead, it puts
> the "boot server" in the sname field, which PXELINUX currently
ignores.
> 
> Here's a simple patch (vs. 3.36) that will take an IP string in the
> field.  My assembly is pretty rusty, and I couldn't quite figure out
how
> to use the DNS resolver, so it doesn't handle a hostname.  This does
> work for me with an IP string.
You have no guarantee that sname is an IP string; in fact, in the 
typical case it will not be.

I don't think this patch is safe.

	-hpa

Op 29-06-2007 om 15:11 schreef Desmond Boyd:
> Hi,
> 
> Any luck on fixing the floppy disk access problem
> or is it only affecting me?
Test reports of newer versions then 3.36,
such as the recent released 3.50, are welcome.


Geert Stappers
Annoyed about a thread posting not belonging in the thread.

I did all the tests as far as im aware, there listed in the previous posts, 
if theres anything else i need to do please let me know.

>From: stappers at stappers.nl (Geert Stappers)
>Reply-To: For discussion of SYSLINUX and tftp-hpa <syslinux at
zytor.com>
>To: syslinux at zytor.com
>Subject: Re: [syslinux] syslinux-3.36 Physical Floppy Disk Access Problem
>Date: Fri, 29 Jun 2007 17:41:31 +0200
>
>Op 29-06-2007 om 15:11 schreef Desmond Boyd:
> > Hi,
> >
> > Any luck on fixing the floppy disk access problem
> > or is it only affecting me?
>
>Test reports of newer versions then 3.36,
>such as the recent released 3.50, are welcome.
>
>
>Geert Stappers
>Annoyed about a thread posting not belonging in the thread.
>
>_______________________________________________
>SYSLINUX mailing list
>Submissions to SYSLINUX at zytor.com
>Unsubscribe or set options at:
>http://www.zytor.com/mailman/listinfo/syslinux
>Please do not send private replies to mailing list traffic.
>
_________________________________________________________________
Tell MSN about your most memorable emails!  http://www.emailbritain.co.uk/

Op 29-06-2007 om 18:29 schreef Desmond Boyd:
> >From: stappers at stappers.nl (Geert Stappers)
> >Date: Fri, 29 Jun 2007 17:41:31 +0200
> >Op 29-06-2007 om 15:11 schreef Desmond Boyd:
> > > Hi,
> > >
> > > Any luck on fixing the floppy disk access problem
> > > or is it only affecting me?
> >
> >Test reports of newer versions then 3.36,
> >such as the recent released 3.50, are welcome.
>
> I did all the tests as far as im aware, there listed in the previous
> posts, if theres anything else i need to do please let me know.
:-)


Things to do:

- Be aware that you are addressing a community.
- Find common interrests in that community.
- Convert a personal/private problem in a community challenge.
- Be carefull with other peoples time.
- Make good (as is usefull) references to previous postings.
- Reply below the text.
- Keep smiling!


Cheers
Geert Stappers