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kolibrios/programs/network/dnsr/trunk/dnsr.asm
Ataualpa 5be6f93061 Sysxtree now knows more file types, and dnsr got Russian interface 
git-svn-id: svn://kolibrios.org@993 a494cfbc-eb01-0410-851d-a64ba20cac60
2008-12-31 17:02:06 +00:00

786 lines
16 KiB
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;
; DNS Domain name -> IP lookup
;
; Compile with FASM for Menuet
;
; If you like, you camd change the DNS server default by changing the
; IP address in the dnsServer string.
; Enabling debugging puts the received response to the
; debug board
DEBUGGING_ENABLED equ 1
DEBUGGING_DISABLED equ 0
DEBUGGING_STATE equ DEBUGGING_DISABLED
use32
org 0x0
db 'MENUET01' ; header
dd 0x01 ; header version
dd START ; entry point
dd I_END ; image size
dd I_END+0x10000 ; required memory
dd I_END+0x10000 ; esp
dd 0x0 , 0x0 ; I_Param , I_Path
include 'lang.inc'
include 'macros.inc'
START: ; start of execution
mov eax,40 ; Report events
mov ebx,10000111b ; Stack 8 + defaults
int 0x40
mov dword [prompt], p1
mov dword [promptlen], p1len - p1 ; 'waiting for command'
red:
call draw_window ; at first, draw the window
still:
mov eax,10 ; wait here for event
mcall
cmp eax,1 ; redraw request ?
jz red
cmp eax,2 ; key in buffer ?
jz key
cmp eax,3 ; button in buffer ?
jz button
jmp still
key: ; Keys are not valid at this part of the
mov eax,2 ; loop. Just read it and ignore
mcall
jmp still
button: ; button
mov eax,17 ; get id
mcall
cmp ah,1 ; button id=1 ?
jnz noclose
; close socket before exiting
mov eax, 53
mov ebx, 1
mov ecx, [socketNum]
mcall
mov eax,0xffffffff ; close this program
mcall
noclose:
cmp ah,3 ; Resolve address?
jnz noresolve
mov dword [prompt], p5
mov dword [promptlen], p5len - p5 ; display 'Resolving'
call draw_window
call translateData ; Convert domain & DNS IP address
call resolveDomain
jmp still
noresolve:
cmp ah,4
jz f1 ; Enter domain name
cmp ah,5
jz f2 ; enter DNS Server IP
jmp still
f1:
mov [addr],dword query
mov [ya],dword 35
jmp rk
f2:
mov [addr],dword dnsServer
mov [ya],dword 35+16
rk:
mov ecx,26
mov edi,[addr]
mov al,' '
rep stosb
call print_text
mov edi,[addr]
f11:
mov eax,10
mcall
cmp eax,2
jz fbu
jmp still
fbu:
mov eax,2
mcall ; get key
shr eax,8
cmp eax,8
jnz nobs
cmp edi,[addr]
jz f11
sub edi,1
mov [edi],byte ' '
call print_text
jmp f11
nobs:
cmp eax,dword 31
jbe f11
cmp eax,dword 95
jb keyok
sub eax,32
keyok:
mov [edi],al
call print_text
add edi,1
mov esi,[addr]
add esi,26
cmp esi,edi
jnz f11
jmp still
print_text:
mov eax,13
mov ebx,103*65536+26*6
mov ecx,[ya]
shl ecx,16
mov cx,8
mov edx,0x224466
mcall
mov eax,4
mov ebx,103*65536
add ebx,[ya]
mov ecx,0xffffff
mov edx,[addr]
mov esi,26
mcall
ret
;***************************************************************************
; Function
; translateData
;
; Description
; Coverts the domain name and DNS IP address typed in by the user into
; a format suitable for the IP layer.
;
; The ename, in query, is converted and stored in dnsMsg
; The DNS ip, in dnsServer, is converted and stored in dnsIP
;
;***************************************************************************
translateData:
; first, get the IP address of the DNS server
; Then, build up the request string.
xor eax, eax
mov dh, 10
mov dl, al
mov [dnsIP], eax
mov esi, dnsServer
mov edi, dnsIP
mov ecx, 4
td003:
lodsb
sub al, '0'
add dl, al
lodsb
cmp al, '.'
je ipNext
cmp al, ' '
je ipNext
mov dh, al
sub dh, '0'
mov al, 10
mul dl
add al, dh
mov dl, al
lodsb
cmp al, '.'
je ipNext
cmp al, ' '
je ipNext
mov dh, al
sub dh, '0'
mov al, 10
mul dl
add al, dh
mov dl, al
lodsb
ipNext:
mov [edi], dl
inc edi
mov dl, 0
loop td003
; Build the request string
mov eax, 0x00010100
mov [dnsMsg], eax
mov eax, 0x00000100
mov [dnsMsg+4], eax
mov eax, 0x00000000
mov [dnsMsg+8], eax
; domain name goes in at dnsMsg+12
mov esi, dnsMsg + 12 ; location of label length
mov edi, dnsMsg + 13 ; label start
mov edx, query
mov ecx, 12 ; total string length so far
td002:
mov [esi], byte 0
inc ecx
td0021:
mov al, [edx]
cmp al, ' '
je td001 ; we have finished the string translation
cmp al, '.' ; we have finished the label
je td004
inc byte [esi]
inc ecx
mov [edi], al
inc edi
inc edx
jmp td0021
td004:
mov esi, edi
inc edi
inc edx
jmp td002
; write label len + label text
td001:
mov [edi], byte 0
inc ecx
inc edi
mov [edi], dword 0x01000100
add ecx, 4
mov [dnsMsgLen], ecx
ret
;***************************************************************************
; Function
; resolveDomain
;
; Description
; Sends a question to the dns server
; works out the IP address from the response from the DNS server
;
;***************************************************************************
resolveDomain:
; Get a free port number
mov ecx, 1000 ; local port starting at 1000
getlp:
inc ecx
push ecx
mov eax, 53
mov ebx, 9
mcall
pop ecx
cmp eax, 0 ; is this local port in use?
jz getlp ; yes - so try next
; First, open socket
mov eax, 53
mov ebx, 0
mov edx, 53 ; remote port - dns
mov esi, [dnsIP]
mcall
mov [socketNum], eax
; write to socket ( request DNS lookup )
mov eax, 53
mov ebx, 4
mov ecx, [socketNum]
mov edx, [dnsMsgLen]
mov esi, dnsMsg
mcall
; Setup the DNS response buffer
mov eax, dnsMsg
mov [dnsMsgLen], eax
; now, we wait for
; UI redraw
; UI close
; or data from remote
ctr001:
mov eax,10 ; wait here for event
mcall
cmp eax,1 ; redraw request ?
je ctr003
cmp eax,2 ; key in buffer ?
je ctr004
cmp eax,3 ; button in buffer ?
je ctr005
; Any data in the UDP receive buffer?
mov eax, 53
mov ebx, 2
mov ecx, [socketNum]
mcall
cmp eax, 0
je ctr001
; we have data - this will be the response
ctr002:
mov eax, 53
mov ebx, 3
mov ecx, [socketNum]
mcall ; read byte - block (high byte)
; Store the data in the response buffer
mov eax, [dnsMsgLen]
mov [eax], bl
inc dword [dnsMsgLen]
if DEBUGGING_STATE = DEBUGGING_ENABLED
call debug_print_rx_ip
end if
mov eax, 53
mov ebx, 2
mov ecx, [socketNum]
mcall ; any more data?
cmp eax, 0
jne ctr002 ; yes, so get it
; close socket
mov eax, 53
mov ebx, 1
mov ecx, [socketNum]
mcall
mov [socketNum], dword 0xFFFF
; Now parse the message to get the host IP
; Man, this is complicated. It's described in
; RFC 1035
; 1) Validate that we have an answer with > 0 responses
; 2) Find the answer record with TYPE 0001 ( host IP )
; 3) Finally, copy the IP address to the display
; Note: The response is in dnsMsg
; The end of the buffer is pointed to by [dnsMsgLen]
; Clear the IP address text
mov [hostIP], dword 0
mov esi, dnsMsg
; Is this a response to my question?
mov al, [esi+2]
and al, 0x80
cmp al, 0x80
jne ctr002a
; Were there any errors?
mov al, [esi+3]
and al, 0x0F
cmp al, 0x00
jne ctr002a
; Is there ( at least 1 ) answer?
mov ax, [esi+6]
cmp ax, 0x00
je ctr002a
; Header validated. Scan through and get my answer
add esi, 12 ; Skip to the question field
; Skip through the question field
call skipName
add esi, 4 ; skip past the questions qtype, qclass
ctr002z:
; Now at the answer. There may be several answers,
; find the right one ( TYPE = 0x0001 )
call skipName
mov ax, [esi]
cmp ax, 0x0100 ; Is this the IP address answer?
jne ctr002c
; Yes! Point esi to the first byte of the IP address
add esi, 10
mov eax, [esi]
mov [hostIP], eax
jmp ctr002a ; And exit...
ctr002c: ; Skip through the answer, move to the next
add esi, 8
movzx eax, byte [esi+1]
mov ah, [esi]
add esi, eax
add esi, 2
; Have we reached the end of the msg?
; This is an error condition, should not happen
cmp esi, [dnsMsgLen]
jl ctr002z ; Check next answer
jmp ctr002a ; abort
ctr002a:
mov dword [prompt], p4 ; Display IP address
mov dword [promptlen], p4len - p4
call draw_window
jmp ctr001
ctr003: ; redraw
call draw_window
jmp ctr001
ctr004: ; key
mov eax,2 ; just read it and ignore
mcall
jmp ctr001
ctr005: ; button
mov eax,17 ; get id
mcall
; close socket
mov eax, 53
mov ebx, 1
mov ecx, [socketNum]
mcall
mov [socketNum], dword 0xFFFF
mov [hostIP], dword 0
mov dword [prompt], p1
mov dword [promptlen], p1len - p1 ; 'waiting for command'
call draw_window ; at first, draw the window
ret
;***************************************************************************
; Function
; skipName
;
; Description
; Increment esi to the first byte past the name field
; Names may use compressed labels. Normally do.
; RFC 1035 page 30 gives details
;
;***************************************************************************
skipName:
mov al, [esi]
cmp al, 0
je sn_exit
and al, 0xc0
cmp al, 0xc0
je sn001
movzx eax, byte [esi]
inc eax
add esi, eax
jmp skipName
sn001:
add esi, 2 ; A pointer is always at the end
ret
sn_exit:
inc esi
ret
; *********************************************
; ******* WINDOW DEFINITIONS AND DRAW ********
; *********************************************
draw_window:
mov eax,12 ; function 12:tell os about windowdraw
mov ebx,1 ; 1, start of draw
mcall
; DRAW WINDOW
mov eax,0 ; function 0 : define and draw window
mov ebx,100*65536+300 ; [x start] *65536 + [x size]
mov ecx,100*65536+140 ; [y start] *65536 + [y size]
mov edx,0x14224466 ; color of work area RRGGBB
mov edi,title ; WINDOW LABEL;
mcall
mov eax,8 ; Resolve
mov ebx,20*65536+190
mov ecx,79*65536+15
mov edx,3
mov esi,0x557799
mcall
;mov eax,8
mov ebx,270*65536+10
mov ecx,34*65536+10
inc edx
mcall
;mov eax,8
mov ebx,270*65536+10
mov ecx,50*65536+10
inc edx
mcall
; Copy the file name to the screen buffer
; file name is same length as IP address, to
; make the math easier later.
cld
mov esi,query
mov edi,text+13
mov ecx,26
rep movsb
; copy the IP address to the screen buffer
mov esi,dnsServer
mov edi,text+40+13
mov ecx,26
rep movsb
; copy the prompt to the screen buffer
mov esi,[prompt]
mov edi,text+200
mov ecx,[promptlen]
rep movsb
; Re-draw the screen text
cld
mov eax,4
mov ebx,25*65536+35 ; draw info text with function 4
mov ecx,0xffffff
mov edx,text
mov esi,40
newline:
mcall
add ebx,16
add edx,40
cmp [edx],byte 'x'
jnz newline
; Write the host IP, if we have one
mov eax, [hostIP]
cmp eax, 0
je dw001
; We have an IP address... display it
mov edi,hostIP
mov edx,97*65536+115
mov esi,0x00ffffff
mov ebx,3*65536
ipdisplay:
mov eax,47
movzx ecx,byte [edi]
mcall
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
mcall
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
mcall
inc word [ind]
mov ax, [ind]
and ax, 0x1f
cmp ax, 0
jne ds1
mov cl, 13
mov eax,63
mov ebx, 1
mcall
mov cl, 10
mov eax,63
mov ebx, 1
mcall
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:
if lang eq ru
db '<27><><EFBFBD> <20><><EFBFBD><EFBFBD><EFBFBD> : xxxxxxxxxxxxxxx '
db 'DNS <20><>ࢥ<EFBFBD> : xxx.xxx.xxx.xxx '
db ' '
db ' <20><><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD> <20><><EFBFBD><EFBFBD><EFBFBD> '
db ' '
db ' '
db 'x <- END MARKER, DONT DELETE '
else
db 'Host name : xxxxxxxxxxxxxxx '
db 'DNS server : xxx.xxx.xxx.xxx '
db ' '
db ' RESOLVE ADDRESS '
db ' '
db ' '
db 'x <- END MARKER, DONT DELETE '
end if
if lang eq ru
title db 'DNS <20><><EFBFBD><EFBFBD><EFBFBD><EFBFBD>',0
else
title db 'DNS Client',0
end if
prompt: dd 0
promptlen: dd 0
if lang eq ru
p1: db '<27><><EFBFBD> <20><><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD> '
p1len:
else
p1: db 'Waiting for Command '
p1len:
end if
p4: db 'IP Address: . . . '
p4len:
p5: db 'Resolving... '
p5len:
dnsServer db '194.145.128.1 ' ; iolfree.ie DNS
query db 'WWW.MENUETOS.NET '
hostIP: dd 0
dnsIP: dd 0
dnsMsgLen: dd 0
socketNum: dd 0xFFFF
dnsMsg:
I_END:
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