1530 lines
33 KiB
NASM
1530 lines
33 KiB
NASM
;
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; HTTPC.ASM
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;
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; Compile with FASM for Menuet ( v1.40 for DOS )
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;
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; This program implements a very simple web browser
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;
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; Version 0.4 2nd December 2003 Mike Hibbett
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; Enabled lowercase/uppcase characters in URL
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; Version 0.3 30th November 2003 Mike Hibbett
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; Fixed bug with tcp socket opne - uses unique port
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; Version 0.2 27th November 2003 Mike Hibbett
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; Added user entry of url, and implements url -> IP address
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; resolution through DNS
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;
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; Version 0.1 Ville Mikael Turjanmaa
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; Original version
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; Enabling debugging puts stuff to the 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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;include "DEBUG.INC"
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URLMAXLEN equ 50 ; maximum length of url string
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; Memory usage
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; webpage source file at 0x10000
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; decoded text page at 0x20000
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; text attribute 0x30000 (1 = normal, 2 = bold, 128+ = link)
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START: ; start of execution
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;dps <"Program started",13,10>
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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
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still:
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mov eax,23 ; wait here for event
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mov ebx,1
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int 0x40
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cmp eax,1 ; redraw request ?
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je red
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cmp eax,2 ; key in buffer ?
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je key
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cmp eax,3 ; button in buffer ?
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je button
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; Get the web page data from the remote server
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call read_incoming_data
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mov eax,[status]
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mov [prev_status],eax
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mov eax,53
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mov ebx,6
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mov ecx,[socket]
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int 0x40
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mov [status],eax
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cmp [prev_status],4
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jge no_send
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cmp [status],4
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jne no_send
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mov [onoff],1
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call send_request
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no_send:
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call print_status
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cmp [prev_status],4
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jne no_close
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cmp [status],4 ; connection closed by server
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jbe no_close ; respond to connection close command
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; draw page
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call read_incoming_data
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mov eax,53
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mov ebx,8
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mov ecx,[socket]
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int 0x40
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call draw_page
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mov [onoff],0
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no_close:
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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: ; key
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mov eax,2 ; just read it and ignore
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int 0x40
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shr eax,8
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cmp eax,184
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jne no_down
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cmp [display_from],25
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jb no_down
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sub [display_from],25
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call display_page
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no_down:
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cmp eax,183
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jne no_up
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add [display_from],25
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call display_page
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no_up:
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jmp still
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button: ; button
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;dps <"Button pressed",13,10>
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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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jne noclose
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;dps "Closing socket before exit... "
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mov eax, 53
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mov ebx, 8
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mov ecx, [socket]
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int 0x40
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;dpd eax
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;dps <13,10>
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exit:
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or eax,-1 ; close this program
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int 0x40
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noclose:
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cmp ah,31
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jne noup
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sub [display_from],20
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call display_page
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jmp still
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noup:
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cmp ah,32
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jne nodown
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add [display_from],20
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call display_page
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jmp still
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nodown:
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cmp ah, 10 ; Enter url
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jne nourl
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mov [addr],dword document_user
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mov [ya],dword 38
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mov [len],dword URLMAXLEN
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mov ecx,[len]
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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 ; key?
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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 10
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je retkey
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cmp eax, dword 13
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je retkey
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cmp eax,dword 31
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jbe f11
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; Removed in v0.4
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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,URLMAXLEN
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cmp esi,edi
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jnz f11
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jmp still
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retkey:
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mov ah, 22 ; start load
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nourl:
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call socket_commands ; opens or closes the connection
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jmp still
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;****************************************************************************
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; Function
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; send_request
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;
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; Description
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; Transmits the GET request to the server.
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; This is done as GET then URL then HTTP/1.0',13,10,13,10 in 3 packets
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;
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;****************************************************************************
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send_request:
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pusha
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mov eax,53 ; 'GET '
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mov ebx,7
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mov ecx,[socket]
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mov edx,4
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mov esi,string0
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int 0x40
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mov edx,0
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next_edx:
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; Determine the length of the url to send in the GET request
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inc edx
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cmp [edx+document],byte ' '
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jne next_edx
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mov eax,53 ; document_user
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mov ebx,7
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mov ecx,[socket]
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mov esi,document
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int 0x40
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mov eax,53 ; ' HTTP/1.0 .. '
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mov ebx,7
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mov ecx,[socket]
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mov edx,stringh_end-stringh
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mov esi,stringh
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int 0x40
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popa
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ret
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;****************************************************************************
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; Function
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; print_status
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;
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; Description
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; displays the socket/data received status information
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;
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;****************************************************************************
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print_status:
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pusha
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mov eax,26
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mov ebx,9
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int 0x40
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cmp eax,[nextupdate]
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jb status_return
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add eax,25
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mov [nextupdate],eax
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mov eax,13
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mov ebx,5*65536+100
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mov ecx,[winys]
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shl ecx,16
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add ecx,-18*65536+10
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mov edx,0xffffff
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int 0x40
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mov eax,47
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mov ebx,3*65536
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mov ecx,[status]
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mov edx,12*65536-18
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add edx,[winys]
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mov esi,0x000000
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int 0x40
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mov eax,47
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mov ebx,6*65536
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mov ecx,[pos]
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mov edx,40*65536-18
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add edx,[winys]
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mov esi,0x000000
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int 0x40
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status_return:
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popa
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ret
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;****************************************************************************
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; Function
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; read_incoming_data
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;
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; Description
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; receive the web page from the server, storing it without processing
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;
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;****************************************************************************
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read_incoming_data:
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cmp [onoff],1
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je rid
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ret
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rid:
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mov ecx,-1
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newbyteread:
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mov eax, 53
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mov ebx, 2
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mov ecx, [socket]
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int 0x40
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cmp eax,0
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je no_more_data
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read_more:
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mov eax, 53
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mov ebx, 3
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mov ecx, [socket]
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int 0x40
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yesm:
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inc [pos]
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mov ecx,[pos]
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mov [0x10000+ecx],bl
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call print_status
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cmp eax,0
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jne read_more
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mov eax,5
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mov ebx,50
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int 0x40
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jmp newbyteread
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no_more_data:
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ret
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;****************************************************************************
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; Function
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; draw_page
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;
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; Description
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; parses the web page data, storing displayable data at 0x20000
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; and attributes at 0x30000. It then calls display_page to render
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; the data
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;
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;****************************************************************************
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draw_page:
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pusha
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mov esi,0
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mov [command_on_off],0
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newlettercheck:
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movzx eax,byte [esi+0x10000]
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cmp al,'<'
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jne no_c_on
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mov [command_on_off],1
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no_c_on:
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cmp al,'>'
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jne no_c_off
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mov [command_on_off],0
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no_c_off:
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cmp [command_on_off],0
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je no_lower_case
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cmp eax,96
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jg no_lower_case
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cmp eax,65
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jb no_lower_case
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add eax,32
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no_lower_case:
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mov [esi+0x10000],al
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inc esi
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cmp esi,[pos]
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jbe newlettercheck
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mov edi,0x30000
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mov ecx,0x10000
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mov al,0
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cld
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rep stosb
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mov [text_type],1
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mov [command_on_off],0
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mov esi,0
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mov ecx,[pos]
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; search for double lf
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find_dlf:
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cmp [0x10000+esi-4],dword 0x0d0a0d0a
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je found_dlf
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cmp [0x10000+esi-4],dword 0x0a0d0a0d
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je found_dlf
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cmp [0x10000+esi-2],word 0x0d0d
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je found_dlf
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cmp [0x10000+esi-2],word 0x0a0a
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je found_dlf
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cmp esi,5500
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je found_dlf
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inc esi
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jmp find_dlf
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found_dlf:
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newbyte:
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mov al,[esi+0x10000]
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cmp al,'<'
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jne no_command_on
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mov [command_on_off],1
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no_command_on:
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cmp al,'>'
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jne no_command_off
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mov [command_on_off],0
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jmp byte_done
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no_command_off:
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mov eax,[esi+0x10000] ; <!--
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cmp eax,'<!--'
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jne no_com2_start
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mov [com2],1
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no_com2_start:
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mov ax,[esi+0x10000] ; -->
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cmp ax,'->'
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jne no_com2_end
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mov [com2],0
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inc esi
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jmp byte_done
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no_com2_end:
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mov eax,[esi+0x10000] ; <script
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cmp eax,'<scr'
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jne no_script_start
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mov [script],1
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no_script_start:
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mov eax,[esi+0x10000] ; /script>
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cmp eax,'</sc'
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jne no_script_end
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mov [script],0
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inc esi
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jmp byte_done
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no_script_end:
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cmp [command_on_off],0
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jne no_print
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cmp [com2],0
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jne no_print
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cmp [script],0
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jne no_print
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mov al,[esi+0x10000] ; &
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cmp al,'&'
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jne no_nbsp
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newsps:
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inc esi
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mov al,[esi+0x10000] ;
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cmp al,';'
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jne newsps
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jmp byte_done
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no_nbsp:
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cmp al,13
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jne no_lb
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jmp byte_done
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no_lb:
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cmp al,10
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jne no_lf
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jmp byte_done
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no_lf:
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mov ebx,[pagey]
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imul ebx,[pagexs]
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add ebx,[pagex]
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add ebx,0x20000
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and eax,0xff
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cmp eax,31
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jbe byte_done
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cmp [lastletter],al
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jne letter_ok
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cmp al,' '
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je byte_done
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letter_ok:
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mov [ebx],al
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mov dl,[text_type]
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mov [ebx+0x10000],dl
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mov [pageyinc],0
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mov [lastletter],al
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inc [pagex]
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mov ebx,[pagex]
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cmp ebx,[pagexs]
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jb byte_done
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mov [pagex],0
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inc [pagey]
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jmp byte_done
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no_print:
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; HTML -COMMAND
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mov ax,[esi+0x10000] ; b> bold
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cmp ax,'b>'
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jne no_bold_start
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mov [text_type],2
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no_bold_start:
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mov eax,[esi+0x10000] ; /b bold end
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cmp eax,'</b>'
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jne no_bold_end
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mov [text_type],1
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add esi,2
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no_bold_end:
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mov ax,[esi+0x10000] ; <a
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cmp ax,'a '
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jne no_link_start
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mov [text_type],128
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add esi,2
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no_link_start:
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mov ax,[esi+0x10000] ; /a
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cmp ax,'/a'
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jne no_link_end2
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mov [text_type],1
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add esi,0
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no_link_end2:
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mov ax,[esi+0x10000]
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cmp ax,'br'
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jne no_br
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call linefeed
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inc esi
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no_br:
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mov ax,[esi+0x10000]
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cmp ax,'td'
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jne no_td
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call linefeed
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inc esi
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no_td:
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mov eax,[esi+0x10000]
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cmp eax,'tabl'
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jne no_table
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call linefeed
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add esi,3
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no_table:
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byte_done:
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inc esi
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cmp esi,[pos]
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jbe newbyte
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mov [display_from],0
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call display_page
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popa
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ret
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;****************************************************************************
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; Function
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; linefeed
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;
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; Description
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;
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;
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;****************************************************************************
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linefeed:
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cmp [pageyinc],2
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jge nolf
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mov [pagex],0
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inc [pagey]
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inc [pageyinc]
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nolf:
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ret
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;****************************************************************************
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; Function
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; display_page
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;
|
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; Description
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; Renders the text decoded by draw_page
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;
|
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;****************************************************************************
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display_page:
|
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pusha
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mov eax,0
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mov ebx,0
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newpxy:
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push eax
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push ebx
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mov eax,13 ; background for letter
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mov ebx,[esp+4]
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imul ebx,6
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add ebx,[dpx]
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shl ebx,16
|
|
add ebx,6
|
|
mov ecx,[esp+0]
|
|
imul ecx,10
|
|
add ecx,[dpy]
|
|
shl ecx,16
|
|
add ecx,10
|
|
mov edx,0xffffff
|
|
int 0x40
|
|
|
|
mov eax,4
|
|
mov ebx,[esp+4]
|
|
imul ebx,6
|
|
add ebx,[dpx]
|
|
shl ebx,16
|
|
|
|
mov bx,[esp+0]
|
|
imul bx,10
|
|
add bx,word [dpy]
|
|
|
|
mov esi,[esp]
|
|
imul esi,[pagexs]
|
|
add esi,[esp+4]
|
|
|
|
mov edx,[display_from]
|
|
imul edx,[pagexs]
|
|
add edx,0x20000
|
|
add edx,esi
|
|
|
|
movzx ecx,byte [edx+0x10000]
|
|
cmp ecx,1
|
|
jne noecx1
|
|
mov ecx,0x000000
|
|
|
|
noecx1:
|
|
movzx ecx,byte [edx+0x10000]
|
|
cmp ecx,2
|
|
jne noecx2
|
|
mov ecx,0xff0000
|
|
|
|
noecx2:
|
|
cmp ecx,128
|
|
jne noecx128
|
|
mov ecx,0x0000ff
|
|
|
|
noecx128:
|
|
mov esi,1
|
|
|
|
int 0x40
|
|
|
|
pop ebx
|
|
pop eax
|
|
|
|
inc eax
|
|
cmp eax,[pagexs]
|
|
jb newpxy
|
|
mov eax,0
|
|
inc ebx
|
|
cmp ebx,30
|
|
jb newpxy
|
|
|
|
popa
|
|
ret
|
|
|
|
|
|
|
|
|
|
;****************************************************************************
|
|
; Function
|
|
; socket_commands
|
|
;
|
|
; Description
|
|
; opens or closes the socket
|
|
;
|
|
;****************************************************************************
|
|
socket_commands:
|
|
cmp ah,22 ; open socket
|
|
jnz tst3
|
|
|
|
; Clear all page memory
|
|
mov edi,0x10000
|
|
mov ecx,0x30000
|
|
mov al,0
|
|
cld
|
|
rep stosb
|
|
|
|
; Parse the entered url
|
|
call parse_url
|
|
|
|
; Get a free port number
|
|
mov ecx, 1000 ; local port starting at 1000
|
|
getlp1:
|
|
inc ecx
|
|
push ecx
|
|
mov eax, 53
|
|
mov ebx, 9
|
|
int 0x40
|
|
pop ecx
|
|
cmp eax, 0 ; is this local port in use?
|
|
jz getlp1 ; yes - so try next
|
|
|
|
mov eax,53
|
|
mov ebx,5
|
|
mov edx,80
|
|
mov esi,dword [server_ip]
|
|
mov edi,1
|
|
int 0x40
|
|
mov [socket], eax
|
|
|
|
mov [pos],0
|
|
mov [pagex],0
|
|
mov [pagey],0
|
|
mov [pagexs],80
|
|
mov [command_on_off],0
|
|
|
|
ret
|
|
|
|
tst3:
|
|
cmp ah,24 ; close socket
|
|
jnz no_24
|
|
|
|
mov eax,53
|
|
mov ebx,8
|
|
mov ecx,[socket]
|
|
int 0x40
|
|
|
|
call draw_page
|
|
|
|
ret
|
|
|
|
no_24:
|
|
ret
|
|
|
|
|
|
|
|
;****************************************************************************
|
|
; Function
|
|
; parse_url
|
|
;
|
|
; Description
|
|
; parses the full url typed in by the user into a web address ( that
|
|
; can be turned into an IP address by DNS ) and the page to display
|
|
; DNS will be used to translate the web address into an IP address, if
|
|
; needed.
|
|
; url is at document_user and will be space terminated.
|
|
; web address goes to webAddr and is space terminated.
|
|
; ip address goes to server_ip
|
|
; page goes to document and is space terminated.
|
|
;
|
|
; Supported formats:
|
|
; <protocol://>address<page>
|
|
; <protocol> is optional, removed and ignored - only http supported
|
|
; <address> is required. It can be an ip address or web address
|
|
; <page> is optional and must start with a leading / character
|
|
;
|
|
;****************************************************************************
|
|
parse_url:
|
|
; First, reset destination variables
|
|
cld
|
|
mov al, ' '
|
|
mov edi, document
|
|
mov ecx,URLMAXLEN
|
|
rep stosb
|
|
mov edi, webAddr
|
|
mov ecx,URLMAXLEN
|
|
rep stosb
|
|
mov al, '/'
|
|
mov [document], al
|
|
|
|
mov esi, document_user
|
|
; remove any leading protocol text
|
|
mov ecx, URLMAXLEN
|
|
mov ax, '//'
|
|
|
|
pu_000:
|
|
cmp [esi], byte ' ' ; end of text?
|
|
je pu_002 ; yep, so not found
|
|
cmp word [esi], ax
|
|
je pu_001 ; Found it, so esi+2 is start
|
|
inc esi
|
|
loop pu_000
|
|
|
|
pu_002:
|
|
; not found, so reset esi to start
|
|
mov esi, document_user -2
|
|
|
|
pu_001:
|
|
add esi, 2
|
|
|
|
mov ebx, esi ; save address of start of web address
|
|
mov edi, document_user + URLMAXLEN ; end of string
|
|
|
|
; look for page delimiter - it's a '/' character
|
|
pu_003:
|
|
cmp [esi], byte ' ' ; end of text?
|
|
je pu_004 ; yep, so none found
|
|
cmp esi, edi ; end of string?
|
|
je pu_004 ; yep, so none found
|
|
cmp [esi], byte '/' ; delimiter?
|
|
je pu_005 ; yep - process it
|
|
inc esi
|
|
jmp pu_003
|
|
|
|
pu_005:
|
|
; copy page to document address
|
|
; esi = delimiter
|
|
push esi
|
|
inc esi
|
|
mov ecx, edi ; end of document_user
|
|
mov edi, document
|
|
cld
|
|
|
|
pu_006:
|
|
movsb
|
|
cmp esi, ecx
|
|
je pu_007 ; end of string?
|
|
cmp [esi], byte ' ' ; end of text
|
|
je pu_007
|
|
jmp pu_006
|
|
|
|
pu_007:
|
|
pop esi ; point esi to '/' delimiter
|
|
|
|
pu_004:
|
|
; copy web address to webAddr
|
|
; start in ebx, end in esi-1
|
|
mov ecx, esi
|
|
mov esi, ebx
|
|
mov edi, webAddr
|
|
cld
|
|
|
|
pu_008:
|
|
movsb
|
|
cmp esi, ecx
|
|
je pu_009
|
|
jmp pu_008
|
|
|
|
pu_009:
|
|
; For debugging, display resulting strings
|
|
|
|
if DEBUGGING_STATE = DEBUGGING_ENABLED
|
|
mov esi, document_user
|
|
call debug_print_string
|
|
mov esi, webAddr
|
|
call debug_print_string
|
|
mov esi, document
|
|
call debug_print_string
|
|
end if
|
|
|
|
; Look up the ip address, or was it specified?
|
|
mov al, [webAddr]
|
|
cmp al, '0'
|
|
jb pu_010 ; Resolve address
|
|
cmp al, '9'
|
|
ja pu_010 ; Resolve address
|
|
|
|
|
|
if DEBUGGING_STATE = DEBUGGING_ENABLED
|
|
mov esi, str2 ; print gotip
|
|
call debug_print_string
|
|
end if
|
|
|
|
; Convert address
|
|
mov esi,webAddr-1
|
|
mov edi,server_ip
|
|
xor eax,eax
|
|
ip1:
|
|
inc esi
|
|
cmp [esi],byte '0'
|
|
jb ip2
|
|
cmp [esi],byte '9'
|
|
jg ip2
|
|
imul eax,10
|
|
movzx ebx,byte [esi]
|
|
sub ebx,48
|
|
add eax,ebx
|
|
jmp ip1
|
|
ip2:
|
|
mov [edi],al
|
|
xor eax,eax
|
|
inc edi
|
|
cmp edi,server_ip+3
|
|
jbe ip1
|
|
|
|
jmp pu_011
|
|
|
|
pu_010:
|
|
|
|
if DEBUGGING_STATE = DEBUGGING_ENABLED
|
|
mov esi, str1 ; print resolving
|
|
call debug_print_string
|
|
end if
|
|
|
|
; Resolve Address
|
|
call translateData ; Convert domain & DNS IP address
|
|
call resolveDomain ; get ip address
|
|
|
|
if DEBUGGING_STATE = DEBUGGING_ENABLED
|
|
mov esi, str3
|
|
call debug_print_string
|
|
end if
|
|
|
|
pu_011:
|
|
|
|
; Done
|
|
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
|
|
;
|
|
;***************************************************************************
|
|
translateData:
|
|
|
|
; first, get the IP address of the DNS server
|
|
; Then, build up the request string.
|
|
|
|
|
|
; 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, webAddr
|
|
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
|
|
int 0x40
|
|
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, dword [dns_ip]
|
|
int 0x40
|
|
|
|
mov [socketNum], eax
|
|
|
|
; write to socket ( request DNS lookup )
|
|
mov eax, 53
|
|
mov ebx, 4
|
|
mov ecx, [socketNum]
|
|
mov edx, [dnsMsgLen]
|
|
mov esi, dnsMsg
|
|
int 0x40
|
|
|
|
; 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
|
|
int 0x40
|
|
|
|
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]
|
|
int 0x40
|
|
|
|
cmp eax, 0
|
|
je ctr001
|
|
|
|
; we have data - this will be the response
|
|
ctr002:
|
|
mov eax, 53
|
|
mov ebx, 3
|
|
mov ecx, [socketNum]
|
|
int 0x40 ; read byte - block (high byte)
|
|
|
|
; Store the data in the response buffer
|
|
mov eax, [dnsMsgLen]
|
|
mov [eax], bl
|
|
inc dword [dnsMsgLen]
|
|
|
|
mov eax, 53
|
|
mov ebx, 2
|
|
mov ecx, [socketNum]
|
|
int 0x40 ; any more data?
|
|
|
|
cmp eax, 0
|
|
jne ctr002 ; yes, so get it
|
|
|
|
; close socket
|
|
mov eax, 53
|
|
mov ebx, 1
|
|
mov ecx, [socketNum]
|
|
int 0x40
|
|
|
|
mov [socketNum], dword 0xFFFF
|
|
|
|
; Now parse the message to get the host IP
|
|
; Man, this is complicated. It's described in
|
|
; RFC 1035
|
|
|
|
if DEBUGGING_STATE = DEBUGGING_ENABLED
|
|
mov esi, str4
|
|
call debug_print_string
|
|
end if
|
|
|
|
; 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 [server_ip], 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
|
|
|
|
if DEBUGGING_STATE = DEBUGGING_ENABLED
|
|
pusha
|
|
mov esi, str4
|
|
call debug_print_string
|
|
popa
|
|
end if
|
|
|
|
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 [server_ip], eax
|
|
ret
|
|
|
|
|
|
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:
|
|
jmp ctr001
|
|
|
|
ctr003: ; redraw
|
|
call draw_window
|
|
jmp ctr001
|
|
|
|
ctr004: ; key
|
|
mov eax,2 ; just read it and ignore
|
|
int 0x40
|
|
jmp ctr001
|
|
|
|
ctr005: ; button
|
|
mov eax,17 ; get id
|
|
int 0x40
|
|
|
|
mov dl, ah
|
|
|
|
; close socket
|
|
mov eax, 53
|
|
mov ebx, 1
|
|
mov ecx, [socketNum]
|
|
int 0x40
|
|
|
|
cmp dl, 1
|
|
je exit
|
|
|
|
mov [socketNum], dword 0xFFFF
|
|
mov [server_ip], dword 0
|
|
|
|
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
|
|
|
|
|
|
|
|
if DEBUGGING_STATE = DEBUGGING_ENABLED
|
|
|
|
;****************************************************************************
|
|
; Function
|
|
; debug_print_string
|
|
;
|
|
; Description
|
|
; prints a string to the debug board, in quotes
|
|
;
|
|
; esi holds ptr to msg to display, which is space or 0 terminated
|
|
;
|
|
; Nothing preserved; I'm assuming a pusha/popa is done before calling
|
|
;
|
|
;****************************************************************************
|
|
debug_print_string:
|
|
push esi
|
|
mov cl, '"'
|
|
mov eax,63
|
|
mov ebx, 1
|
|
int 0x40
|
|
pop esi
|
|
|
|
dps_000:
|
|
mov cl, [esi]
|
|
cmp cl, 0
|
|
je dps_exit
|
|
cmp cl, ' '
|
|
je dps_exit
|
|
jmp dps_001
|
|
|
|
dps_exit:
|
|
mov cl, '"'
|
|
mov eax,63
|
|
mov ebx, 1
|
|
int 0x40
|
|
mov cl, 13
|
|
mov eax,63
|
|
mov ebx, 1
|
|
int 0x40
|
|
mov cl, 10
|
|
mov eax,63
|
|
mov ebx, 1
|
|
int 0x40
|
|
ret
|
|
|
|
dps_001:
|
|
mov eax,63
|
|
mov ebx, 1
|
|
push esi
|
|
int 0x40
|
|
|
|
pop esi
|
|
inc esi
|
|
jmp dps_000
|
|
end if
|
|
|
|
|
|
;****************************************************************************
|
|
; Function
|
|
; print_text
|
|
;
|
|
; Description
|
|
; display the url (full path) text
|
|
;
|
|
;****************************************************************************
|
|
print_text:
|
|
; Draw a bar to blank out previous text
|
|
mov eax,13
|
|
mov ebx,30*65536+URLMAXLEN*6 ; 50 should really be [len], and 103 [xa]
|
|
mov ecx,[ya]
|
|
shl ecx,16
|
|
mov cx,9
|
|
mov edx,0xFFFFFF
|
|
int 0x40
|
|
|
|
; write text
|
|
mov eax,4
|
|
mov ebx,30*65536
|
|
add ebx,[ya]
|
|
mov ecx,0x000000
|
|
mov edx,[addr]
|
|
mov esi,URLMAXLEN
|
|
int 0x40
|
|
|
|
ret
|
|
|
|
; *********************************************
|
|
; ******* WINDOW DEFINITIONS AND DRAW ********
|
|
; *********************************************
|
|
|
|
draw_window:
|
|
mov eax,12 ; function 12:tell os about windowdraw
|
|
mov ebx,1 ; 1, start of draw
|
|
int 0x40
|
|
|
|
; DRAW WINDOW
|
|
mov eax,0 ; function 0 : define and draw window
|
|
mov ebx,50*65536+550 ; [x start] *65536 + [x size]
|
|
mov ecx,50*65536+400 ; [y start] *65536 + [y size]
|
|
mov edx,0x03ffffff ; color of work area RRGGBB,8->color gl
|
|
mov esi,0x805080d0 ; color of grab bar RRGGBB,8->color gl
|
|
mov edi,0x005080d0 ; color of frames RRGGBB
|
|
int 0x40
|
|
|
|
; WINDOW LABEL
|
|
mov eax,4 ; function 4 : write text to window
|
|
mov ebx,8*65536+8 ; [x start] *65536 + [y start]
|
|
mov ecx,0x00ddeeff ; color of text RRGGBB
|
|
mov edx,labelt ; pointer to text beginning
|
|
mov esi,labellen-labelt ; text length
|
|
int 0x40
|
|
|
|
|
|
mov esi, URLMAXLEN ; URL
|
|
mov eax,4 ; function 4 : write text to window
|
|
mov ebx,30*65536+38 ; [x start] *65536 + [y start]
|
|
mov ecx,0x000000 ; color of text RRGGBB
|
|
mov edx,document_user ; pointer to text beginning
|
|
int 0x40
|
|
|
|
mov eax,38
|
|
mov ebx,5*65536+545
|
|
mov ecx,60*65536+60
|
|
mov edx,0x000000
|
|
int 0x40
|
|
|
|
mov eax,38
|
|
mov ebx,5*65536+545
|
|
mov ecx,[winys]
|
|
shl ecx,16
|
|
add ecx,[winys]
|
|
sub ecx,26*65536+26
|
|
mov edx,0x000000
|
|
int 0x40
|
|
; RELOAD
|
|
mov eax,8 ; function 8 : define and draw button
|
|
mov ebx,388*65536+50 ; [x start] *65536 + [x size]
|
|
mov ecx,34*65536+14 ; [y start] *65536 + [y size]
|
|
mov edx,22 ; button id
|
|
mov esi,0x5588dd ; button color RRGGBB
|
|
int 0x40
|
|
|
|
; URL
|
|
mov eax,8 ; function 8 : define and draw button
|
|
mov ebx,10*65536+12 ; [x start] *65536 + [x size]
|
|
mov ecx,34*65536+12 ; [y start] *65536 + [y size]
|
|
mov edx,10 ; button id
|
|
mov esi,0x5588dd ; button color RRGGBB
|
|
int 0x40
|
|
|
|
; STOP
|
|
mov eax,8 ; function 8 : define and draw button
|
|
mov ebx,443*65536+50 ; [x start] *65536 + [x size]
|
|
mov ecx,34*65536+14 ; [y start] *65536 + [y size]
|
|
mov edx,24 ; button id
|
|
mov esi,0x5588dd ; button color RRGGBB
|
|
int 0x40
|
|
|
|
; BUTTON TEXT
|
|
mov eax,4 ; function 4 : write text to window
|
|
mov ebx,390*65536+38 ; [x start] *65536 + [y start]
|
|
mov ecx,0xffffff ; color of text RRGGBB
|
|
mov edx,button_text ; pointer to text beginning
|
|
mov esi,20 ; text length
|
|
int 0x40
|
|
|
|
call display_page
|
|
|
|
mov eax,12 ; function 12:tell os about windowdraw
|
|
mov ebx,2 ; 2, end of draw
|
|
int 0x40
|
|
|
|
ret
|
|
|
|
|
|
if DEBUGGING_STATE = DEBUGGING_ENABLED
|
|
str1: db "Resolving...",0
|
|
str3: db "Resolved",0
|
|
str2: db "GotIP",0
|
|
str4: db "GotResponse",0
|
|
end if
|
|
|
|
button_text db ' RELOAD STOP '
|
|
dpx dd 25 ; x - start of html page in pixels in window
|
|
dpy dd 65 ; for y
|
|
lastletter db 0
|
|
pageyinc dd 0
|
|
display_from dd 20
|
|
pos dd 0x0
|
|
pagex dd 0x0
|
|
pagey dd 0x0
|
|
pagexs dd 80
|
|
command_on_off dd 0x0
|
|
text_type db 1
|
|
com2 dd 0x0
|
|
script dd 0x0
|
|
socket dd 0x0
|
|
|
|
addr dd 0x0
|
|
ya dd 0x0
|
|
len dd 0x00
|
|
|
|
labelt: db 'HTTPC - PgUp/PgDown'
|
|
labellen:
|
|
|
|
server_ip: db 207,44,212,20
|
|
dns_ip: db 194,145,128,1
|
|
webAddr: times 128 db ' '
|
|
document_user: db 'Click on the button to the left to enter a URL',0
|
|
times 100 db 0x0
|
|
document: db '/'
|
|
times 100 db ' '
|
|
|
|
string0: db 'GET '
|
|
|
|
stringh: db ' HTTP/1.0',13,10,13,10
|
|
stringh_end:
|
|
|
|
status dd 0x0
|
|
prev_status dd 0x0
|
|
|
|
onoff dd 0x0
|
|
|
|
nextupdate: dd 0
|
|
winys: dd 400
|
|
|
|
dnsMsgLen: dd 0
|
|
socketNum: dd 0xFFFF
|
|
dnsMsg:
|
|
I_END:
|