596 lines
14 KiB
NASM
596 lines
14 KiB
NASM
;
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; DHCP Client
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;
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; Compile with FASM for Menuet
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;
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include 'lang.inc'
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include 'macros.inc'
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use32
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org 0x0
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db 'MENUET00' ; 8 byte id
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dd 38 ; required os
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dd START ; program start
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dd I_END ; program image size
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dd 0x100000 ; required amount of memory
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dd 0x00000000 ; reserved=no extended header
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START: ; start of execution
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mov eax,40 ; Report events
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mov ebx,10000111b ; Stack 8 + defaults
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int 0x40
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call draw_window ; at first, draw the window
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still:
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mov eax,10 ; wait here for event
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int 0x40
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cmp eax,1 ; redraw request ?
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jz red
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cmp eax,2 ; key in buffer ?
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jz key
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cmp eax,3 ; button in buffer ?
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jz button
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jmp still
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red: ; redraw
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call draw_window
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jmp still
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key: ; Keys are not valid at this part of the
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mov eax,2 ; loop. Just read it and ignore
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int 0x40
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jmp still
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button: ; button
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mov eax,17 ; get id
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int 0x40
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cmp ah,1 ; button id=1 ?
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jnz noclose
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; close socket before exiting
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mov eax, 53
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mov ebx, 1
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mov ecx, [socketNum]
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int 0x40
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mov eax,0xffffffff ; close this program
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int 0x40
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noclose:
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cmp ah,3 ; Resolve address?
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jnz still
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call draw_window
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call contactDHCPServer
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jmp still
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;***************************************************************************
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; Function
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; parseResponse
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;
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; Description
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; extracts the fields ( client IP address and options ) from
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; a DHCP response
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; The values go into
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; dhcpMsgType,dhcpLease,dhcpClientIP,dhcpServerIP,
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; dhcpDNSIP, dhcpSubnet
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; The message is stored in dhcpMsg
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;
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;***************************************************************************
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parseResponse:
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mov edx, dhcpMsg
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mov eax, [edx+16]
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mov [dhcpClientIP], eax
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; Scan options
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add edx, 240 ; Point to first option
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pr001:
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; Get option id
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mov al, [edx]
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cmp al, 0xff ; End of options?
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je pr_exit
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cmp al, 53 ; Msg type is a single byte option
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jne pr002
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mov al, [edx+2]
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mov [dhcpMsgType], al
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add edx, 3
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jmp pr001 ; Get next option
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pr002:
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; All other (accepted) options are 4 bytes in length
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inc edx
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movzx ecx, byte [edx]
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inc edx ; point to data
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cmp al, 54 ; server id
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jne pr0021
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mov eax, [edx] ; All options are 4 bytes, so get it
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mov [dhcpServerIP], eax
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jmp pr003
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pr0021:
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cmp al, 51 ; lease
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jne pr0022
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mov eax, [edx] ; All options are 4 bytes, so get it
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mov [dhcpLease], eax
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jmp pr003
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pr0022:
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cmp al, 1 ; subnet mask
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jne pr0023
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mov eax, [edx] ; All options are 4 bytes, so get it
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mov [dhcpSubnet], eax
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jmp pr003
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pr0023:
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cmp al, 6 ; dns ip
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jne pr0024
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mov eax, [edx] ; All options are 4 bytes, so get it
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mov [dhcpDNSIP], eax
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pr0024:
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cmp al, 3 ; gateway ip
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jne pr003
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mov eax, [edx] ; All options are 4 bytes, so get it
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mov [dhcpGateway], eax
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pr003:
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add edx, ecx
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jmp pr001
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pr_exit:
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ret
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;***************************************************************************
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; Function
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; buildRequest
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;
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; Description
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; Creates a DHCP request packet.
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;
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;***************************************************************************
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buildRequest:
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; Clear dhcpMsg to all zeros
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xor eax,eax
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mov edi,dhcpMsg
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mov ecx,512
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cld
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rep stosb
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mov edx, dhcpMsg
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mov [edx], byte 0x01 ; Boot request
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mov [edx+1], byte 0x01 ; Ethernet
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mov [edx+2], byte 0x06 ; Ethernet h/w len
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mov [edx+4], dword 0x11223344 ; xid
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mov [edx+10], byte 0x80 ; broadcast flag set
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mov [edx+236], dword 0x63538263 ; magic number
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; option DHCP msg type
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mov [edx+240], word 0x0135
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mov al, [dhcpMsgType]
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mov [edx+240+2], al
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; option Lease time = infinity
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mov [edx+240+3], word 0x0433
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mov eax, [dhcpLease]
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mov [edx+240+5], eax
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; option requested IP address
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mov [edx+240+9], word 0x0432
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mov eax, [dhcpClientIP]
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mov [edx+240+11], eax
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; option request list
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mov [edx+240+15], word 0x0437
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mov [edx+240+17], dword 0x0f060301
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; Check which msg we are sending
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cmp [dhcpMsgType], byte 0x01
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jne br001
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; "Discover" options
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; end of options marker
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mov [edx+240+21], byte 0xff
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mov [dhcpMsgLen], dword 262
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jmp br_exit
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br001:
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; "Request" options
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; server IP
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mov [edx+240+21], word 0x0436
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mov eax, [dhcpServerIP]
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mov [edx+240+23], eax
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; end of options marker
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mov [edx+240+27], byte 0xff
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mov [dhcpMsgLen], dword 268
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br_exit:
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ret
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;***************************************************************************
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; Function
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; contactDHCPServer
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;
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; Description
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; negotiates settings with a DHCP server
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;
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;***************************************************************************
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contactDHCPServer:
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; First, open socket
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mov eax, 53
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mov ebx, 0
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mov ecx, 68 ; local port dhcp client
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mov edx, 67 ; remote port - dhcp server
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mov esi, 0xffffffff ; broadcast
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int 0x40
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mov [socketNum], eax
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; Setup the first msg we will send
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mov [dhcpMsgType], byte 0x01 ; DHCP discover
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mov [dhcpLease], dword 0xffffffff
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mov [dhcpClientIP], dword 0
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mov [dhcpServerIP], dword 0
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call buildRequest
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ctr000:
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; write to socket ( send broadcast request )
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mov eax, 53
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mov ebx, 4
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mov ecx, [socketNum]
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mov edx, [dhcpMsgLen]
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mov esi, dhcpMsg
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int 0x40
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; Setup the DHCP buffer to receive response
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mov eax, dhcpMsg
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mov [dhcpMsgLen], eax ; Used as a pointer to the data
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; now, we wait for
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; UI redraw
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; UI close
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; or data from remote
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ctr001:
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mov eax,10 ; wait here for event
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int 0x40
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cmp eax,1 ; redraw request ?
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je ctr003
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cmp eax,2 ; key in buffer ?
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je ctr004
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cmp eax,3 ; button in buffer ?
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je ctr005
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; Any data in the UDP receive buffer?
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mov eax, 53
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mov ebx, 2
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mov ecx, [socketNum]
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int 0x40
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cmp eax, 0
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je ctr001
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; we have data - this will be the response
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ctr002:
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mov eax, 53
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mov ebx, 3
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mov ecx, [socketNum]
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int 0x40 ; read byte - block (high byte)
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; Store the data in the response buffer
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mov eax, [dhcpMsgLen]
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mov [eax], bl
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inc dword [dhcpMsgLen]
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mov eax, 53
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mov ebx, 2
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mov ecx, [socketNum]
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int 0x40 ; any more data?
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cmp eax, 0
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jne ctr002 ; yes, so get it
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; depending on which msg we sent, handle the response
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; accordingly.
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; If the response is to a dhcp discover, then:
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; 1) If response is DHCP OFFER then
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; 1.1) record server IP, lease time & IP address.
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; 1.2) send a request packet
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; 2) else exit ( display error )
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; If the response is to a dhcp request, then:
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; 1) If the response is DHCP ACK then
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; 1.1) extract the DNS & subnet fields. Set them in the stack
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; 2) else exit ( display error )
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cmp [dhcpMsgType], byte 0x01 ; did we send a discover?
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je ctr007
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cmp [dhcpMsgType], byte 0x03 ; did we send a request?
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je ctr008
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; should never get here - we only send discover or request
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jmp ctr006
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ctr007:
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call parseResponse
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; Was the response an offer? It should be
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cmp [dhcpMsgType], byte 0x02
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jne ctr006 ; NO - so quit
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; send request
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mov [dhcpMsgType], byte 0x03 ; DHCP request
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call buildRequest
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jmp ctr000
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ctr008:
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call parseResponse
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; Was the response an ACK? It should be
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cmp [dhcpMsgType], byte 0x05
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jne ctr006 ; NO - so quit
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; Set or display addresses here...
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ctr006:
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; close socket
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mov eax, 53
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mov ebx, 1
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mov ecx, [socketNum]
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int 0x40
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mov [socketNum], dword 0xFFFF
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call draw_window
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jmp ctr001
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ctr003: ; redraw
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call draw_window
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jmp ctr001
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ctr004: ; key
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mov eax,2 ; just read it and ignore
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int 0x40
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jmp ctr001
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ctr005: ; button
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mov eax,17 ; get id
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int 0x40
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; close socket
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mov eax, 53
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mov ebx, 1
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mov ecx, [socketNum]
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int 0x40
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mov [socketNum], dword 0xFFFF
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call draw_window ; at first, draw the window
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ret
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; *********************************************
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; ******* WINDOW DEFINITIONS AND DRAW ********
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; *********************************************
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; Pass in the IP address in edi
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; row to display in [ya]
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drawIP:
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; mov edi,hostIP
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mov ecx, edi
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add ecx, 4
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mov edx,[ya]
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add edx, 97*65536
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mov esi,0x00ffffff
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mov ebx,3*65536
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ipdisplay:
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mov eax,47
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push ecx
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movzx ecx,byte [edi]
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int 0x40
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pop ecx
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add edx,6*4*65536
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inc edi
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cmp edi,ecx
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jb ipdisplay
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ret
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drawDHMS:
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mov eax,[edi]
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bswap eax
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mov esi,dhms
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mov ecx,16
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mov edi,text+40*4+12
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cmp eax,0xffffffff
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jne nforever
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mov esi,forever
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cld
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rep movsb
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ret
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nforever:
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cld
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rep movsb
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mov ecx,28
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xor edx,edx
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mov ebx,60
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div ebx
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call displayDHMS
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xor edx,edx
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div ebx
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call displayDHMS
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xor edx,edx
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mov ebx,24
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div ebx
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call displayDHMS
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mov edx,eax
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call displayDHMS
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ret
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displayDHMS:
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pusha
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mov eax,47
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mov ebx,3*65536
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mov edx,ecx
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imul edx,6
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shl edx,16
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add edx,1*65536+99
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mov ecx,[esp+20]
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mov esi,0xffffff
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int 0x40
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popa
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sub ecx,4
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ret
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draw_window:
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mov eax,12 ; function 12:tell os about windowdraw
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mov ebx,1 ; 1, start of draw
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int 0x40
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; DRAW WINDOW
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mov eax,0 ; function 0 : define and draw window
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mov ebx,100*65536+300 ; [x start] *65536 + [x size]
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mov ecx,100*65536+156 ; [y start] *65536 + [y size]
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mov edx,0x03224466 ; color of work area RRGGBB
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mov esi,0x00334455 ; color of grab bar RRGGBB,8->color gl
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mov edi,0x00ddeeff ; color of frames RRGGBB
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int 0x40
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; WINDOW LABEL
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mov eax,4 ; function 4 : write text to window
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mov ebx,8*65536+8 ; [x start] *65536 + [y start]
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mov ecx,0x00ffffff ; color of text RRGGBB
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mov edx,labelt ; pointer to text beginning
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mov esi,labellen-labelt ; text length
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int 0x40
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mov eax,8 ; Resolve
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mov ebx,20*65536+90
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mov ecx,127*65536+15
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mov edx,3
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mov esi,0x557799
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int 0x40
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; Pass in the IP address in edi
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; row to display in [ya]
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mov edi, dhcpClientIP
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mov eax, 35
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mov [ya], eax
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call drawIP
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mov edi, dhcpGateway
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mov eax, 35 + 16
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mov [ya], eax
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call drawIP
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mov edi, dhcpSubnet
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mov eax, 35 + 32
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mov [ya], eax
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call drawIP
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mov edi, dhcpDNSIP
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mov eax, 35 + 48
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mov [ya], eax
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call drawIP
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mov edi, dhcpLease
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call drawDHMS
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; Re-draw the screen text
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cld
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mov ebx,25*65536+35 ; draw info text with function 4
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mov ecx,0xffffff
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mov edx,text
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mov esi,40
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newline:
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mov eax,4
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int 0x40
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add ebx,16
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add edx,40
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cmp [edx],byte 'x'
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jnz newline
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mov eax,12 ; function 12:tell os about windowdraw
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mov ebx,2 ; 2, end of draw
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int 0x40
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ret
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; DATA AREA
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ya dd 0x0
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text:
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db 'Client IP : . . . '
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db 'Gateway IP: . . . '
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db 'Subnet : . . . '
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db 'DNS IP : . . . '
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db 'Lease Time: d h m s '
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db ' '
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db ' SEND REQUEST '
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db 'x <- END MARKER, DONT DELETE '
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dhms db ' d h m s'
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forever db 'Forever '
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labelt: db 'DHCP Client Test'
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labellen:
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dhcpMsgType: db 0
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dhcpLease: dd 0
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dhcpClientIP: dd 0
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dhcpServerIP: dd 0
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dhcpDNSIP: dd 0
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dhcpSubnet: dd 0
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dhcpGateway: dd 0
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dhcpMsgLen: dd 0
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socketNum: dd 0xFFFF
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dhcpMsg:
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I_END:
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