Syslinux - Aug 2002 - re: using mac-addr for selecting configfile now working

Hi everybody
hacking in the 200-pre4 i found everything i needed, so i gave it a try ...
and it works! But dont blame for the code, its just quick and dirty!

--- ../syslinux-2.00-pre4/pxelinux.asm  Sat Jun 15 07:25:51 2002
+++ ./pxelinux.asm      Wed Aug 14 10:05:00 2002
@@ -17,6 +17,11 @@
 ;  version; incorporated herein by reference.
 ;
 ;
****************************************************************************

+; modified by Hans-Werner Jouy (hans-werner.jouy at hamburglb.de) to use
+; the macaddr aus configfilename, only try full maccaddr, then vendor part
+; (first 3 byte), then defaultfilename: dirty hack, USE AT YOUR OWN RISK
+; but free or better try to integrate into stable release
+;
****************************************************************************


 %define IS_PXELINUX 1
 %include "macros.inc"
@@ -692,22 +697,39 @@
                mov si,cfgprefix
                mov cx,cfgprefix_len
                rep movsb
-               mov cx,8
-               mov eax,[MyIP]
+               mov cx,6                        ; 6 nibbles in vendor part
of MAC
+               mov eax,[MyMAC1]                ; 3 bytes vendor part of
MAC
+               xchg ah,al                      ; Convert to host byte
order
+               ror eax,16
+               xchg ah,al
+.hexify_loop1: rol eax,4
+               push eax
+               and al,0Fh
+               cmp al,10
+               jae .high1
+.low1:         add al,'0'
+               jmp short .char1
+.high1:                add al,'A'-10
+.char1:                stosb
+               pop eax
+               loop .hexify_loop1
+
+               mov cx,6                        ; 6 nibbles in netcard part
of MAC
+               mov eax,[MyMAC2]                ; 3 byte netcard part of
MAC
                xchg ah,al                      ; Convert to host byte
order
                ror eax,16
                xchg ah,al
-.hexify_loop:  rol eax,4
+.hexify_loop2: rol eax,4
                push eax
                and al,0Fh
                cmp al,10
-               jae .high
-.low:          add al,'0'
-               jmp short .char
-.high:         add al,'A'-10
-.char:         stosb
+               jae .high2
+.low2:         add al,'0'
+               jmp short .char2
+.high2:                add al,'A'-10
+.char2:                stosb
                pop eax
-               loop .hexify_loop
+               loop .hexify_loop2

 ;
 ; Begin looking for configuration file
@@ -730,7 +752,7 @@

 .no_option:            ; Have to guess config file name

-               mov cx,9                        ; Up to 9 attempts
+               mov cx,3                        ; Up to 3 attempts
(complete MAC, vendor part of MAC, default

 .tryagain:     mov byte [di],0
                cmp cx,byte 1
@@ -751,6 +773,11 @@
                jnz .success

 .badness:      popa
+               dec di                           ; truncate configfilename
6 nibbles / 3 byte
+               dec di
+               dec di
+               dec di
+               dec di
                dec di
                loop .tryagain

@@ -2071,6 +2098,8 @@
 ; information is present:
 ;
 ; MyIP         - client IP address
+; MyMAC1       - client MAC address (vendor part)
+; MyMAC2       - client MAC address
 ; ServerIP     - boot server IP address
 ; Netmask      - network mask
 ; Gateway      - default gateway router IP
@@ -2082,6 +2111,10 @@

 parse_dhcp:
                mov byte [OverLoad],0           ; Assume no overload
+               mov eax, [trackbuf+bootp.macaddr]     ; get macaddr (vendor
part)
+               mov [MyMAC1], eax
+               mov eax, [trackbuf+bootp.macaddr+3]   ; get macaddr
(netcard part)
+               mov [MyMAC2], eax
                mov eax, [trackbuf+bootp.yip]
                and eax, eax
                jz .noyip
@@ -2484,6 +2517,8 @@

 ;
 ; IP information (initialized to "unknown" values)
+MyMAC1         dd 0                    ; My MAC (vendor part)
+MyMAC2         dd 0                    ; My MAC (card part)
 MyIP           dd 0                    ; My IP address
 ServerIP       dd 0                    ; IP address of boot server
 Netmask                dd 0                    ; Netmask of this subnet

--------------------------------------------------------------------
Hans-Werner Jouy
--------------------------------------------------------------------
Hamburgische Landesbank
Organisation/Informatik, Handelssysteme/SAP
Gerhart-Hauptmann-Platz 50, 20095 Hamburg
Im Internet: www.hamburglb.de
--------------------------------------------------------------------
Hans-Werner.Jouy at HamburgLB.DE
--------------------------------------------------------------------





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