781 lines
17 KiB
NASM
781 lines
17 KiB
NASM
;
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; DNS Domain name -> IP lookup
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;
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; Compile with FASM for Menuet
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;
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; If you like, you camd change the DNS server default by changing the
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; IP address in the dnsServer string.
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; Enabling debugging puts the received response to the
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; debug board
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DEBUGGING_ENABLED equ 1
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DEBUGGING_DISABLED equ 0
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DEBUGGING_STATE equ DEBUGGING_DISABLED
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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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include 'lang.inc'
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include 'macros.inc'
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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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mov dword [prompt], p1
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mov dword [promptlen], p1len - p1 ; 'waiting for command'
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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 noresolve
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mov dword [prompt], p5
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mov dword [promptlen], p5len - p5 ; display 'Resolving'
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call draw_window
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call translateData ; Convert domain & DNS IP address
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call resolveDomain
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jmp still
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noresolve:
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cmp ah,4
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jz f1 ; Enter domain name
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cmp ah,5
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jz f2 ; enter DNS Server IP
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jmp still
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f1:
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mov [addr],dword query
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mov [ya],dword 35
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jmp rk
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f2:
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mov [addr],dword dnsServer
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mov [ya],dword 35+16
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rk:
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mov ecx,26
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mov edi,[addr]
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mov al,' '
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rep stosb
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call print_text
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mov edi,[addr]
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f11:
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mov eax,10
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int 0x40
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cmp eax,2
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jz fbu
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jmp still
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fbu:
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mov eax,2
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int 0x40 ; get key
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shr eax,8
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cmp eax,8
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jnz nobs
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cmp edi,[addr]
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jz f11
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sub edi,1
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mov [edi],byte ' '
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call print_text
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jmp f11
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nobs:
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cmp eax,dword 31
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jbe f11
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cmp eax,dword 95
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jb keyok
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sub eax,32
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keyok:
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mov [edi],al
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call print_text
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add edi,1
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mov esi,[addr]
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add esi,26
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cmp esi,edi
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jnz f11
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jmp still
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print_text:
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mov eax,13
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mov ebx,103*65536+26*6
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mov ecx,[ya]
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shl ecx,16
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mov cx,8
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mov edx,0x224466
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int 0x40
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mov eax,4
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mov ebx,103*65536
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add ebx,[ya]
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mov ecx,0xffffff
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mov edx,[addr]
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mov esi,26
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int 0x40
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ret
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;***************************************************************************
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; Function
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; translateData
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;
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; Description
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; Coverts the domain name and DNS IP address typed in by the user into
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; a format suitable for the IP layer.
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;
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; The ename, in query, is converted and stored in dnsMsg
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; The DNS ip, in dnsServer, is converted and stored in dnsIP
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;
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;***************************************************************************
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translateData:
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; first, get the IP address of the DNS server
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; Then, build up the request string.
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xor eax, eax
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mov dh, 10
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mov dl, al
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mov [dnsIP], eax
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mov esi, dnsServer
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mov edi, dnsIP
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mov ecx, 4
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td003:
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lodsb
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sub al, '0'
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add dl, al
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lodsb
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cmp al, '.'
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je ipNext
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cmp al, ' '
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je ipNext
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mov dh, al
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sub dh, '0'
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mov al, 10
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mul dl
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add al, dh
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mov dl, al
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lodsb
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cmp al, '.'
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je ipNext
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cmp al, ' '
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je ipNext
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mov dh, al
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sub dh, '0'
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mov al, 10
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mul dl
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add al, dh
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mov dl, al
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lodsb
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ipNext:
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mov [edi], dl
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inc edi
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mov dl, 0
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loop td003
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; Build the request string
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mov eax, 0x00010100
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mov [dnsMsg], eax
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mov eax, 0x00000100
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mov [dnsMsg+4], eax
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mov eax, 0x00000000
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mov [dnsMsg+8], eax
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; domain name goes in at dnsMsg+12
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mov esi, dnsMsg + 12 ; location of label length
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mov edi, dnsMsg + 13 ; label start
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mov edx, query
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mov ecx, 12 ; total string length so far
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td002:
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mov [esi], byte 0
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inc ecx
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td0021:
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mov al, [edx]
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cmp al, ' '
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je td001 ; we have finished the string translation
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cmp al, '.' ; we have finished the label
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je td004
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inc byte [esi]
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inc ecx
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mov [edi], al
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inc edi
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inc edx
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jmp td0021
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td004:
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mov esi, edi
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inc edi
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inc edx
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jmp td002
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; write label len + label text
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td001:
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mov [edi], byte 0
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inc ecx
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inc edi
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mov [edi], dword 0x01000100
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add ecx, 4
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mov [dnsMsgLen], ecx
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ret
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;***************************************************************************
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; Function
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; resolveDomain
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;
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; Description
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; Sends a question to the dns server
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; works out the IP address from the response from the DNS server
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;
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;***************************************************************************
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resolveDomain:
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; Get a free port number
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mov ecx, 1000 ; local port starting at 1000
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getlp:
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inc ecx
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push ecx
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mov eax, 53
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mov ebx, 9
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int 0x40
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pop ecx
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cmp eax, 0 ; is this local port in use?
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jz getlp ; yes - so try next
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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 edx, 53 ; remote port - dns
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mov esi, [dnsIP]
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int 0x40
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mov [socketNum], eax
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; write to socket ( request DNS lookup )
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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, [dnsMsgLen]
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mov esi, dnsMsg
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int 0x40
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; Setup the DNS response buffer
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mov eax, dnsMsg
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mov [dnsMsgLen], eax
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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, [dnsMsgLen]
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mov [eax], bl
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inc dword [dnsMsgLen]
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if DEBUGGING_STATE = DEBUGGING_ENABLED
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call debug_print_rx_ip
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end if
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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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; 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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; Now parse the message to get the host IP
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; Man, this is complicated. It's described in
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; RFC 1035
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; 1) Validate that we have an answer with > 0 responses
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; 2) Find the answer record with TYPE 0001 ( host IP )
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; 3) Finally, copy the IP address to the display
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; Note: The response is in dnsMsg
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; The end of the buffer is pointed to by [dnsMsgLen]
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; Clear the IP address text
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mov [hostIP], dword 0
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mov esi, dnsMsg
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; Is this a response to my question?
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mov al, [esi+2]
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and al, 0x80
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cmp al, 0x80
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jne ctr002a
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; Were there any errors?
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mov al, [esi+3]
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and al, 0x0F
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cmp al, 0x00
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jne ctr002a
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; Is there ( at least 1 ) answer?
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mov ax, [esi+6]
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cmp ax, 0x00
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je ctr002a
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; Header validated. Scan through and get my answer
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add esi, 12 ; Skip to the question field
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; Skip through the question field
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call skipName
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add esi, 4 ; skip past the questions qtype, qclass
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ctr002z:
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; Now at the answer. There may be several answers,
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; find the right one ( TYPE = 0x0001 )
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call skipName
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mov ax, [esi]
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cmp ax, 0x0100 ; Is this the IP address answer?
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jne ctr002c
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; Yes! Point esi to the first byte of the IP address
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add esi, 10
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mov eax, [esi]
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mov [hostIP], eax
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jmp ctr002a ; And exit...
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ctr002c: ; Skip through the answer, move to the next
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add esi, 8
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movzx eax, byte [esi+1]
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mov ah, [esi]
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add esi, eax
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add esi, 2
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; Have we reached the end of the msg?
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; This is an error condition, should not happen
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cmp esi, [dnsMsgLen]
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jl ctr002z ; Check next answer
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jmp ctr002a ; abort
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ctr002a:
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mov dword [prompt], p4 ; Display IP address
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mov dword [promptlen], p4len - p4
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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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mov [hostIP], dword 0
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mov dword [prompt], p1
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mov dword [promptlen], p1len - p1 ; 'waiting for command'
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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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; Function
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; skipName
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;
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; Description
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; Increment esi to the first byte past the name field
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; Names may use compressed labels. Normally do.
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; RFC 1035 page 30 gives details
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;
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;***************************************************************************
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skipName:
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mov al, [esi]
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cmp al, 0
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je sn_exit
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and al, 0xc0
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cmp al, 0xc0
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je sn001
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movzx eax, byte [esi]
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inc eax
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add esi, eax
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jmp skipName
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sn001:
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add esi, 2 ; A pointer is always at the end
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ret
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sn_exit:
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inc esi
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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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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+140 ; [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+190
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mov ecx,79*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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mov eax,8
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mov ebx,270*65536+10
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mov ecx,34*65536+10
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mov edx,4
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mov esi,0x557799
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int 0x40
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mov eax,8
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mov ebx,270*65536+10
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mov ecx,50*65536+10
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mov edx,5
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mov esi,0x557799
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int 0x40
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; Copy the file name to the screen buffer
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; file name is same length as IP address, to
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; make the math easier later.
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cld
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mov esi,query
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mov edi,text+13
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mov ecx,26
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rep movsb
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; copy the IP address to the screen buffer
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mov esi,dnsServer
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mov edi,text+40+13
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mov ecx,26
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rep movsb
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; copy the prompt to the screen buffer
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mov esi,[prompt]
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mov edi,text+200
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mov ecx,[promptlen]
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rep movsb
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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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; Write the host IP, if we have one
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mov eax, [hostIP]
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cmp eax, 0
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je dw001
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; We have an IP address... display it
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mov edi,hostIP
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mov edx,97*65536+115
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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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movzx ecx,byte [edi]
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int 0x40
|
|
add edx,6*4*65536
|
|
inc edi
|
|
cmp edi,hostIP+4
|
|
jb ipdisplay
|
|
|
|
dw001:
|
|
mov eax,12 ; function 12:tell os about windowdraw
|
|
mov ebx,2 ; 2, end of draw
|
|
int 0x40
|
|
|
|
ret
|
|
|
|
|
|
if DEBUGGING_STATE = DEBUGGING_ENABLED
|
|
;****************************************************************************
|
|
; Function
|
|
; debug_print_string
|
|
;
|
|
; Description
|
|
; prints a string to the debug board
|
|
;
|
|
; esi holds ptr to msg to display
|
|
;
|
|
; Nothing preserved; I'm assuming a pusha/popa is done before calling
|
|
;
|
|
;****************************************************************************
|
|
debug_print_string:
|
|
mov cl, [esi]
|
|
cmp cl, 0
|
|
jnz dps_001
|
|
ret
|
|
|
|
dps_001:
|
|
mov eax,63
|
|
mov ebx, 1
|
|
push esi
|
|
int 0x40
|
|
|
|
inc word [ind]
|
|
mov ax, [ind]
|
|
and ax, 0x1f
|
|
cmp ax, 0
|
|
jne ds1
|
|
|
|
mov cl, 13
|
|
mov eax,63
|
|
mov ebx, 1
|
|
int 0x40
|
|
mov cl, 10
|
|
mov eax,63
|
|
mov ebx, 1
|
|
int 0x40
|
|
|
|
|
|
ds1:
|
|
pop esi
|
|
inc esi
|
|
jmp debug_print_string
|
|
|
|
|
|
ind: dw 0
|
|
; This is used for translating hex to ASCII for display or output
|
|
hexchars db '0','1','2','3','4','5','6','7','8','9','A','B','C','D','E','F'
|
|
IP_STR db 'xx',0
|
|
|
|
|
|
debug_print_rx_ip:
|
|
pusha
|
|
mov edi, IP_STR
|
|
|
|
xor eax, eax
|
|
mov al, bl
|
|
shr al, 4
|
|
mov ah, [eax + hexchars]
|
|
mov [edi], ah
|
|
inc edi
|
|
|
|
xor eax, eax
|
|
mov al, bl
|
|
and al, 0x0f
|
|
mov ah, [eax + hexchars]
|
|
mov [edi], ah
|
|
mov esi, IP_STR
|
|
|
|
call debug_print_string
|
|
popa
|
|
ret
|
|
end if
|
|
|
|
|
|
; DATA AREA
|
|
|
|
addr dd 0x0
|
|
ya dd 0x0
|
|
|
|
text:
|
|
db 'Host name : xxxxxxxxxxxxxxx '
|
|
db 'DNS server : xxx.xxx.xxx.xxx '
|
|
db ' '
|
|
db ' RESOLVE ADDRESS '
|
|
db ' '
|
|
db ' '
|
|
db 'x <- END MARKER, DONT DELETE '
|
|
|
|
|
|
labelt:
|
|
db 'DNS Client'
|
|
labellen:
|
|
|
|
|
|
prompt: dd 0
|
|
promptlen: dd 0
|
|
|
|
|
|
p1: db 'Waiting for Command '
|
|
p1len:
|
|
|
|
p4: db 'IP Address: . . . '
|
|
p4len:
|
|
|
|
p5: db 'Resolving... '
|
|
p5len:
|
|
|
|
|
|
dnsServer db '194.145.128.1 ' ; iolfree.ie DNS
|
|
query db 'WWW.MENUETOS.ORG '
|
|
|
|
hostIP: dd 0
|
|
dnsIP: dd 0
|
|
dnsMsgLen: dd 0
|
|
socketNum: dd 0xFFFF
|
|
dnsMsg:
|
|
I_END:
|