[Etherboot-users] Using pxe with a single dhcp server

[John N. <jn...@it...>]

This small patch for etherboot 5.3.4 will check to see if the DHCP 
supplied filename ends with ".zpxe".  If it does then the extension is 
trimmed off.  This allows pxe to load etherboot and then etherboot to 
load a different nbi without having to make the dhcp server check what 
the client is.

This example works with ISC dhcp 2
group
{
         host sb101-99
         {
                 fixed-address sb101-99;
                 hardware ethernet 00:d0:b7:90:4a:11;
                 filename "eepro100.zpxe";
                 next-server 192.168.5.41;
         }
}

In your tftp directory you need
eepro100.zpxe - etherboot .zpxe image
eepro100      - nbi that you want to boot


The patch:
diff -ruN etherboot-5.3.4/src/core/nic.c etherboot-5.3.4.jn/src/core/nic.c
--- etherboot-5.3.4/src/core/nic.c      Thu Aug  7 08:20:20 2003
+++ etherboot-5.3.4.jn/src/core/nic.c   Thu Nov 27 09:51:11 2003
@@ -248,6 +248,7 @@
  int eth_load(struct dev *dev __unused)
  {
         const char      *kernel;
+       int i;
         printf("Me: %@, Server: %@",
                 arptable[ARP_CLIENT].ipaddr.s_addr,
                 arptable[ARP_SERVER].ipaddr.s_addr);
@@ -271,6 +272,20 @@
  #else
         kernel = KERNEL_BUF;
  #endif
+       i = 0;
+       while(kernel[i++]);
+       if(i > 5)
+       {
+               if(kernel[i - 6] == '.' &&
+                  kernel[i - 5] == 'z' &&
+                  kernel[i - 4] == 'p' &&
+                  kernel[i - 3] == 'x' &&
+                  kernel[i - 2] == 'e')
+               {
+                       printf("Trimming file extension\n");
+                       kernel[i - 6] = 0;
+               }
+       }
         loadkernel(kernel); /* We don't return except on error */
         printf("Unable to load file.\n");
         interruptible_sleep(2);         /* lay off the server for a 
while */


It probably needs some #defines so it can be make into a compile time 
option.

John.

-- 
Information Technology Innovation Group
School of Information Technology
Swinburne University of Technology
Melbourne, Australia
http://www.it.swin.edu.au/staff/jnewbigin