PktTimeout resw 1 ; Timeout for current packet
RealBaseMem resw 1 ; Amount of DOS memory after freeing
OverLoad resb 1 ; Set if DHCP packet uses "overloading"
+DHCPMagic resb 1 ; PXELINUX magic flags
; The relative position of these fields matter!
MAC_MAX equ 32 ; Handle hardware addresses this long
BOOTIFStr resb 7 ; Space for "BOOTIF="
MACStr resb 3*(MAC_MAX+1) ; MAC address as a string
+; One byte extra since dhcp_copyoption zero-terminates
+UUID resb 16+1 ; UUID, from the PXE stack
+
;
; PXE packets which don't need static initialization
;
mov [LocalDomain],al ; No LocalDomain received
;
-; Now attempt to get the BOOTP/DHCP packet that brought us life (and an IP
-; address). This lives in the DHCPACK packet (query info 2).
+; The DHCP client identifiers are best gotten from the DHCPREQUEST
+; packet (query info 1).
;
-query_bootp:
- mov di,pxe_bootp_query_pkt_2
- mov bx,PXENV_GET_CACHED_INFO
-
- call pxenv
- push word [pxe_bootp_query_pkt_2.status]
- jc .pxe_err1
- cmp ax,byte 0
- je .pxe_ok
-.pxe_err1:
- mov di,pxe_bootp_size_query_pkt
- mov bx,PXENV_GET_CACHED_INFO
-
- call pxenv
- jc .pxe_err
-.pxe_size:
- mov ax,[pxe_bootp_size_query_pkt.buffersize]
- call writehex4
- call crlf
+query_bootp_1:
+ mov dl,1
+ call pxe_get_cached_info
+ call parse_dhcp
-.pxe_err:
- mov si,err_pxefailed
- call writestr
- call writehex4
- mov al, ' '
- call writechr
- pop ax ; Status
- call writehex4
- call crlf
- jmp kaboom ; We're dead
+ ; We don't use flags from the request packet, so
+ ; this is a good time to initialize DHCPMagic...
+ mov byte [DHCPMagic],0
-.pxe_ok:
- pop cx ; Forget status
- mov cx,[pxe_bootp_query_pkt_2.buffersize]
+;
+; Now attempt to get the BOOTP/DHCP packet that brought us life (and an IP
+; address). This lives in the DHCPACK packet (query info 2).
+;
+query_bootp_2:
+ mov dl,2
+ call pxe_get_cached_info
call parse_dhcp ; Parse DHCP packet
;
; Save away MAC address (assume this is in query info 2. If this
; Now, get the boot file and other info. This lives in the CACHED_REPLY
; packet (query info 3).
;
- mov [pxe_bootp_size_query_pkt.packettype], byte 3
-
- mov di,pxe_bootp_query_pkt_3
- mov bx,PXENV_GET_CACHED_INFO
-
- call pxenv
- push word [pxe_bootp_query_pkt_3.status]
- jc .pxe_err1
- cmp ax,byte 0
- jne .pxe_err1
-
- ; Packet loaded OK...
- pop cx ; Forget status
- mov cx,[pxe_bootp_query_pkt_3.buffersize]
+ mov dl,3
+ call pxe_get_cached_info
call parse_dhcp ; Parse DHCP packet
;
mov cx,cfgprefix_len
rep movsb
+ ; Have to guess config file name...
+
+ ; Try loading by UUID.
+ cmp byte [HaveUUID],0
+ je .no_uuid
+
+ push di
+ mov bx,uuid_dashes
+ mov si,UUID
+.gen_uuid:
+ movzx cx,byte [bx]
+ jcxz .done_uuid
+ inc bx
+ call uchexbytes
+ mov al,'-'
+ stosb
+ jmp .gen_uuid
+.done_uuid:
+ mov [di-1],cl ; Remove last dash and zero-terminate
+ pop di
+ call .try
+ jnz .success
+.no_uuid:
+
; Try loading by MAC address
- ; Have to guess config file name
push di
mov si,MACStr
mov cx,(3*17+1)/2
rep movsw
- call .try
pop di
+ call .try
jnz .success
+ ; Nope, try hexadecimal IP prefixes...
.scan_ip:
- mov cx,8
- mov eax,[MyIP]
- xchg ah,al ; Convert to host byte order
- ror eax,16
- xchg ah,al
-.hexify_loop: 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
- pop eax
- loop .hexify_loop
-
- mov cx,9 ; Up to 9 attempts
+ mov cx,4
+ mov si,MyIP
+ call uchexbytes ; Convert to hex string
-.tryagain: mov byte [di],0
- cmp cx,byte 1
- jne .not_default
- pusha
- mov si,default_str
- mov cx,default_len
- rep movsb ; Copy "default" string
- popa
-.not_default:
+ mov cx,8 ; Up to 8 attempts
+.tryagain:
+ mov byte [di],0 ; Zero-terminate string
call .try
jnz .success
- dec di
+ dec di ; Drop one character
loop .tryagain
+ ; Final attempt: "default" string
+ mov si,default_str ; "default" string
+ call strcpy
+ call .try
+ jnz .success
+
mov si,err_noconfig
call writestr
jmp kaboom
pop cx
pop eax
ret
+;
+; uchexbytes
+;
+; Take a number of bytes in memory and convert to upper-case hexadecimal
+;
+; Input:
+; DS:SI = input bytes
+; ES:DI = output buffer
+; CX = number of bytes
+; Output:
+; DS:SI = first byte after
+; ES:DI = first byte after
+; CX = 0
+;
+; Trashes AX
+;
+uchexbytes:
+.loop:
+ lodsb
+ mov ah,al
+ shr al,4
+ call .outchar
+ mov al,ah
+ call .outchar
+ loop .loop
+ ret
+.outchar:
+ and al,0Fh
+ add al,'0'
+ cmp al,'9'
+ jna .done
+ add al,'A'-'9'-1
+.done: stosb
+ ret
+
+;
+; pxe_get_cached_info
+;
+; Get a DHCP packet from the PXE stack into the trackbuf.
+;
+; Input:
+; DL = packet type
+; Output:
+; CX = buffer size
+;
+; Assumes CS == DS == ES.
+;
+pxe_get_cached_info:
+ pushad
+ mov di,pxe_bootp_query_pkt
+ push di
+ xor ax,ax
+ stosw ; Status
+ movzx ax,dl
+ stosw ; Packet type
+ mov ax,trackbufsize
+ stosw ; Buffer size
+ mov ax,trackbuf
+ stosw ; Buffer offset
+ xor ax,ax
+ stosw ; Buffer segment
+
+ pop di ; DI -> parameter set
+ mov bx,PXENV_GET_CACHED_INFO
+ call pxenv
+ jc .err
+ and ax,ax
+ jnz .err
+
+ popad
+ mov cx,[pxe_bootp_query_pkt.buffersize]
+ ret
+
+.err:
+ mov si,err_pxefailed
+ jmp kaboom
;
; parse_dhcp
mov di,BootFile
jmp dhcp_copyoption
+ dopt 97, uuid_client_identifier
+ cmp ax,17 ; type byte + 16 bytes UUID
+ jne .skip
+ cmp [si],ah ; type 0 == UUID
+ jne .skip
+ inc si
+ dec ax
+ mov byte [HaveUUID],1 ; Got UUID
+ mov di,UUID
+ jmp dhcp_copyoption
+.skip: ret
+
dopt 208, pxelinux_magic
cmp al,4 ; Must have length == 4
jne .done
dhcp_option_list_end:
section .text
+ section .data
+HaveUUID db 0
+uuid_dashes db 4,2,2,2,6,0 ; Bytes per UUID dashed section
+ section .text
+
;
; genipopt
;
null_msg db 0
crff_msg db CR, FF, 0
default_str db 'default', 0
-default_len equ ($-default_str)
syslinux_banner db CR, LF, 'PXELINUX ', version_str, ' ', date, ' ', 0
cfgprefix db 'pxelinux.cfg/' ; No final null!
cfgprefix_len equ ($-cfgprefix)
;
; PXE query packets partially filled in
;
-pxe_bootp_query_pkt_2:
-.status: dw 0 ; Status
-.packettype: dw 2 ; DHCPACK packet
-.buffersize: dw trackbufsize ; Packet size
-.buffer: dw trackbuf, 0 ; seg:off of buffer
-.bufferlimit: dw trackbufsize ; Unused
-
-pxe_bootp_query_pkt_3:
-.status: dw 0 ; Status
-.packettype: dw 3 ; Boot server packet
-.buffersize: dw trackbufsize ; Packet size
-.buffer: dw trackbuf, 0 ; seg:off of buffer
-.bufferlimit: dw trackbufsize ; Unused
-
-pxe_bootp_size_query_pkt:
-.status: dw 0 ; Status
-.packettype: dw 2 ; DHCPACK packet
-.buffersize: dw 0 ; Packet size
-.buffer: dw 0, 0 ; seg:off of buffer
-.bufferlimit: dw 0 ; Unused
+ section .bss
+pxe_bootp_query_pkt:
+.status: resw 1 ; Status
+.packettype: resw 1 ; Boot server packet type
+.buffersize: resw 1 ; Packet size
+.buffer: resw 2 ; seg:off of buffer
+.bufferlimit: resw 1 ; Unused
+ section .data
pxe_udp_open_pkt:
.status: dw 0 ; Status
.sip: dd 0 ; Source (our) IP
%error trackbufsize must be a multiple of TFTP_BLOCKSIZE
%endif
%endif
-DHCPMagic db 0 ; DHCP site-specific option info
A bootloader for Linux using the PXE network booting protocol
- Copyright (C) 1994-2004 H. Peter Anvin
+ Copyright (C) 1994-2007 H. Peter Anvin
This program is provided under the terms of the GNU General Public
License, version 2 or, at your option, any later version. There is no
depends on the IP address of the booting machine. PXELINUX will
search for its config file on the boot server in the following way:
- First, it will search for the config file using the hardware type
+ First, it will search for the config file using the client UUID, if
+ one is provided by the PXE stack (note, some BIOSes don't have a
+ valid UUID, and you might end up with something like all 1's.) This is
+ in the standard UUID format using hexadecimal upper digits, e.g.
+ B8945908-D6A6-41A9-611D-74A6AB80B83D.
+
+ Next, it will search for the config file using the hardware type
(using its ARP type code) and address, all in lower case hexadecimal
with dash separators; for example, for an Ethernet (ARP type 1)
with address 88:99:AA:BB:CC:DD it would search for the filename
(in lower case).
As an example, if the boot file name is /mybootdir/pxelinux.0, the
- Ethernet MAC address is 88:99:AA:BB:CC:DD and the IP address
- 192.0.2.91, it will try:
+ UUID is B8945908-D6A6-41A9-611D-74A6AB80B83D, the Ethernet MAC
+ address is 88:99:AA:BB:CC:DD and the IP address 192.0.2.91, it will
+ try:
+ /mybootdir/pxelinux.cfg/B8945908-D6A6-41A9-611D-74A6AB80B83D
/mybootdir/pxelinux.cfg/01-88-99-aa-bb-cc-dd
/mybootdir/pxelinux.cfg/C000025B
/mybootdir/pxelinux.cfg/C000025
will reboot after the timeout interval has expired. This keeps a
machine from getting stuck indefinitely due to a boot server failure.
-PXELINUX does not support MTFTP, and I have no immediate plans of
-doing so. It is of course possible to use MTFTP for the initial boot,
-if you have such a setup. MTFTP server setup is beyond the scope of
-this document.
+PXELINUX does not support MTFTP, and I have no plans of doing so, as
+MTFTP is inherently broken for files more than 65535 packets (about
+92 MB) in size. It is of course possible to use MTFTP for the initial
+boot, if you have such a setup. MTFTP server setup is beyond the
+scope of this document.
++++ SETTING UP THE TFTP SERVER ++++
projects / profile / ivi / syslinux.git / commitdiff