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[pxe] Always retrieve cached DHCPACK and apply to relevant network device

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When chainloading, always retrieve the cached DHCPACK packet from the
underlying PXE stack, and apply it as the original contents of the
"net<X>.dhcp" settings block.  This allows cached DHCP settings to be
used for any chainloaded iPXE binary (not just undionly.kkpxe).

This change eliminates the undocumented "use-cached" setting.  Issuing
the "dhcp" command will now always result in a fresh DHCP request.

Signed-off-by: Michael Brown <mcb30@ipxe.org>
This commit is contained in:
Michael Brown
2013-10-25 17:24:09 +01:00
parent 1aa67eba16
commit 10d19bd2ac
7 changed files with 239 additions and 198 deletions
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6
src/usr/dhcpmgmt.c
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@@ -51,12 +51,8 @@ int dhcp ( struct net_device *netdev ) {
/* Perform DHCP */
printf ( "DHCP (%s %s)", netdev->name,
netdev->ll_protocol->ntoa ( netdev->ll_addr ) );
if ( ( rc = start_dhcp ( &monojob, netdev ) ) == 0 ) {
if ( ( rc = start_dhcp ( &monojob, netdev ) ) == 0 )
rc = monojob_wait ( "" );
} else if ( rc > 0 ) {
printf ( " using cached\n" );
rc = 0;
}
return rc;
}