On Friday 25 Mar 2011 18:14:11 Mike Sollanych wrote:
> I'm working on a project that aims to centralize deployment methods at a
> university. iPXE is going to be the cornerstone of this effort.
>
> One thing we'd like to be able to do is to allow various other IT
> departments to use this central iPXE menu to boot to their existing PXE
> servers (i.e. FOG, Ghost, Cobbler, etc). It seems like this should be
> possible with chain command, and indeed it will go ahead and load a
> PXELINUX image from another TFTP server, but when that image is launched,
> it appears to be looking at the iPXE server to get the new pxelinux.cfg
> file, not the newly supplied other PXE server.
>
> Is there a good way to "bounce" off of iPXE and over to another PXE server?
You may need to override the DHCP-provided "next server" address in order to
persude the subsequent pxelinux (or other NBP) that it should refer to a
different server. You can do this using the "set" command
(http://ipxe.org/cmd/set) to set the "next-server" and/or "filename" variables,
e.g.
set next-server 192.168.0.1
set filename boot/pxelinux.0
chain tftp://${next-server}/${filename}
When the new NBP queries iPXE to establish where server it was loaded from, it
will see the overridden values from next-server and filename, rather than the
original DHCP-provided values.
For pxelinux (and only pxelinux), you can use DHCP options 209 and 210 to
control the location of the pxelinux.cfg file.
> Alternately, we may be able to solve *most* of this problem if we could use
> iPXE variables (i.e. ${hostname}, ${mac}) inside of vesamenu.c32, so that
> pointing at things like our FOG server (which generates MAC-specific
> pxelinux.cfg files to perform 'tasks') could be done in a dynamic fashion.
>
> If there's a way to do either of these, please let me know.
There isn't yet, but it sounds useful. We currently perform settings
expansion when parsing the DHCP-provided filename and root-path. We could
pretty easily also expand filenames received via the PXE FILE API. Could you
try the attached (untested) patch, and see if it does what you need?
Michael
diff --git a/src/arch/i386/interface/pxe/pxe_file.c b/src/arch/i386/interface/pxe/pxe_file.c
index 2676256..713dbbf 100644
--- a/src/arch/i386/interface/pxe/pxe_file.c
+++ b/src/arch/i386/interface/pxe/pxe_file.c
@@ -50,25 +50,31 @@ FEATURE ( FEATURE_MISC, "PXEXT", DHCP_EB_FEATURE_PXE_EXT, 2 );
*
*/
PXENV_EXIT_t pxenv_file_open ( struct s_PXENV_FILE_OPEN *file_open ) {
- userptr_t filename;
- size_t filename_len;
+ userptr_t raw_filename;
+ size_t raw_filename_len;
+ char *filename;
int fd;
DBG ( "PXENV_FILE_OPEN" );
/* Copy name from external program, and open it */
- filename = real_to_user ( file_open->FileName.segment,
- file_open->FileName.offset );
- filename_len = strlen_user ( filename, 0 );
+ raw_filename = real_to_user ( file_open->FileName.segment,
+ file_open->FileName.offset );
+ raw_filename_len = strlen_user ( raw_filename, 0 );
{
- char uri_string[ filename_len + 1 ];
+ char buf[ raw_filename_len + 1 /* NUL */ ];
- copy_from_user ( uri_string, filename, 0,
- sizeof ( uri_string ) );
- DBG ( " %s", uri_string );
- fd = open ( uri_string );
+ copy_from_user ( buf, raw_filename, 0, sizeof ( buf ) );
+ DBG ( " %s", buf );
+
+ filename = expand_settings ( buf );
+ if ( ! filename ) {
+ file_open->Status = PXENV_STATUS_OUT_OF_RESOURCES;
+ return PXENV_EXIT_FAILURE;
+ }
}
+ fd = open ( filename );
if ( fd < 0 ) {
file_open->Status = PXENV_STATUS ( fd );
return PXENV_EXIT_FAILURE;
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