620 lines
18 KiB
NASM
620 lines
18 KiB
NASM
;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
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;; ;;
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;; Copyright (C) KolibriOS team 2010-2013. All rights reserved. ;;
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;; Distributed under terms of the GNU General Public License ;;
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;; ;;
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;; zeroconfig.asm - Zeroconfig service for KolibriOS ;;
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;; ;;
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;; Written by hidnplayr@kolibrios.org ;;
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;; Some code contributed by Derpenguin ;;
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;; ;;
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;; DHCP code is based on that by Mike Hibbet ;;
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; (DHCP client for menuetos) ;;
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;; ;;
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;; GNU GENERAL PUBLIC LICENSE ;;
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;; Version 2, June 1991 ;;
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;; ;;
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;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
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format binary as ""
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use32
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org 0x0
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db 'MENUET01' ; 8 byte id
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dd 0x01 ; header version
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dd START ; start of code
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dd IM_END ; size of image
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dd (I_END+0x100) ; memory for app
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dd (I_END+0x100) ; esp
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dd 0, 0 ; I_Param, I_Path
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; CONFIGURATION
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TIMEOUT = 60 ; in seconds
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BUFFER = 1024 ; in bytes
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__DEBUG__ = 1 ; enable/disable
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__DEBUG_LEVEL__ = 1 ; 1 = all, 2 = errors
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; CONFIGURATION FOR LINK-LOCAL
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PROBE_WAIT = 1 ; second (initial random delay)
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PROBE_MIN = 1 ; second (minimum delay till repeated probe)
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PROBE_MAX = 2 ; seconds (maximum delay till repeated probe)
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PROBE_NUM = 3 ; (number of probe packets)
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ANNOUNCE_NUM = 2 ; (number of announcement packets)
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ANNOUNCE_INTERVAL = 2 ; seconds (time between announcement packets)
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ANNOUNCE_WAIT = 2 ; seconds (delay before announcing)
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MAX_CONFLICTS = 10 ; (max conflicts before rate limiting)
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RATE_LIMIT_INTERVAL = 60 ; seconds (delay between successive attempts)
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DEFEND_INTERVAL = 10 ; seconds (min. wait between defensive ARPs)
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include '../proc32.inc'
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include '../macros.inc'
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include '../debug-fdo.inc'
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include '../network.inc'
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include 'dhcp.inc'
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include '../dll.inc'
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Ip2dword:
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push edx
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; This code validates if the query is an IP containing 4 numbers and 3 dots
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xor al, al ; make al (dot count) zero
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@@:
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cmp byte[edx],'0' ; check if this byte is a number, if not jump to no_IP
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jl no_IP ;
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cmp byte[edx],'9' ;
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jg no_IP ;
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inc edx ; the byte was a number, so lets check the next byte
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cmp byte[edx],0 ; is this byte zero? (have we reached end of query?)
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jz @f ; jump to next @@ then
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cmp byte[edx],':'
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jz @f
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cmp byte[edx],'.' ; is this byte a dot?
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jne @r ; if not, jump to previous @@
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inc al ; the byte was a dot so increment al(dot count)
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inc edx ; next byte
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jmp @r ; lets check for numbers again (jump to previous @@)
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@@: ; we reach this when end of query reached
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cmp al,3 ; check if there where 3 dots
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jnz no_IP ; if not, jump to no_IP
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; The following code will convert this IP into a dword and output it in eax
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; If there is also a port number specified, this will be returned in ebx, otherwise ebx is -1
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pop esi ; edx (query address) was pushed onto stack and is now popped in esi
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xor edx, edx ; result
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xor eax, eax ; current character
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xor ebx, ebx ; current byte
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.outer_loop:
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shl edx, 8
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add edx, ebx
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xor ebx, ebx
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.inner_loop:
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lodsb
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test eax, eax
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jz .finish
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cmp al, '.'
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jz .outer_loop
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sub eax, '0'
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imul ebx, 10
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add ebx, eax
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jmp .inner_loop
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.finish:
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shl edx, 8
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add edx, ebx
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bswap edx ; we want little endian order
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ret
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no_IP:
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pop edx
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xor edx, edx
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ret
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START:
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mcall 40, EVM_STACK2
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DEBUGF 1,">Zero-config service loaded\n"
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.wait:
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mcall 76, API_ETH + 4 ; get MAC of ethernet interface 0
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cmp eax, -1
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jne .start
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mcall 10
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jmp .wait
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.start:
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mov word[MAC], bx
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mov dword[MAC+2], eax
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DEBUGF 1,"->MAC: %x-%x-%x-%x-%x-%x\n", [MAC+0]:2, [MAC+1]:2, [MAC+2]:2, [MAC+3]:2, [MAC+4]:2, [MAC+5]:2
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mcall 40, EVM_STACK
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mcall 68, 11
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stdcall dll.Load,@IMPORT
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or eax, eax
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jnz try_dhcp
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invoke ini.get_str, path, str_ipconfig, str_type, inibuf, 16, 0
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cmp dword[inibuf], 'stat'
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jne try_dhcp
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invoke ini.get_str, path, str_ipconfig, str_ip, inibuf, 16, 0
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mov edx, inibuf
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call Ip2dword
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mcall 76, API_IPv4 + 3, edx
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invoke ini.get_str, path, str_ipconfig, str_gateway, inibuf, 16, 0
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mov edx, inibuf
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call Ip2dword
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mcall 76, API_IPv4 + 9, edx
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invoke ini.get_str, path, str_ipconfig, str_dns, inibuf, 16, 0
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mov edx, inibuf
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call Ip2dword
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mcall 76, API_IPv4 + 5, edx
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invoke ini.get_str, path, str_ipconfig, str_subnet, inibuf, 16, 0
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mov edx, inibuf
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call Ip2dword
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mcall 76, API_IPv4 + 7, edx
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mcall -1
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try_dhcp:
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DEBUGF 1,"->Trying DHCP\n"
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mcall 75, 0, AF_INET4, SOCK_DGRAM, 0 ; open socket (parameters: domain, type, reserved)
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cmp eax, -1
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je error
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mov [socketNum], eax
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DEBUGF 1,"->Socket %x opened\n", eax
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mcall 75, 2, [socketNum], sockaddr1, 18 ; bind socket to local port 68
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cmp eax, -1
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je error
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DEBUGF 1,"->Socket Bound to local port 68\n"
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mcall 75, 4, [socketNum], sockaddr2, 18 ; connect to 255.255.255.255 on port 67
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cmp eax, -1
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je error
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DEBUGF 1,"->Connected to 255.255.255.255 on port 67\n"
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mov [dhcpMsgType], 0x01 ; DHCP discover
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mov [dhcpLease], esi ; esi is still -1 (-1 = forever)
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mcall 26, 9 ; Get system time
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imul eax, 100
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mov [currTime], eax
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build_request: ; Creates a DHCP request packet.
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DEBUGF 1,"->Building request\n"
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stdcall mem.Alloc, BUFFER
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mov [dhcpMsg], eax
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test eax, eax
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jz dhcp_error
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;;; todo: skip this bullcrap
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mov edi, eax
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mov ecx, BUFFER
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xor eax, eax
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rep stosb
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;; todo: put this in a buffer instead of writing bytes and words!
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mov edx, [dhcpMsg]
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; Boot protocol legacy
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mov [edx], byte 0x01 ; Boot request
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mov [edx+1], byte 0x01 ; Ethernet
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mov [edx+2], byte 0x06 ; Ethernet h/w len
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mov [edx+4], dword 0x11223344 ; xid ;;;;;;;
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mov eax, [currTime]
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mov [edx+8], eax ; secs, our uptime
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mov [edx+10], byte 0x80 ; broadcast flag set
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mov eax, dword [MAC] ; first 4 bytes of MAC
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mov [edx+28],dword eax
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mov ax, word [MAC+4] ; last 2 bytes of MAC
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mov [edx+32],word ax
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; DHCP extension
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mov [edx+236], dword 0x63538263 ; magic cookie
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mov [edx+240], word 0x0135 ; option DHCP msg type
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mov al, [dhcpMsgType]
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mov [edx+240+2], al
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mov [edx+240+3], word 0x0433 ; option Lease time = infinity
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mov eax, [dhcpLease]
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mov [edx+240+5], eax
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mov [edx+240+9], word 0x0432 ; option requested IP address
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mov eax, [dhcp.ip]
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mov [edx+240+11], eax
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mov [edx+240+15], word 0x0437 ; option request list
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mov [edx+240+17], dword 0x0f060301
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cmp [dhcpMsgType], byte 0x01 ; Check which msg we are sending
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jne request_options
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mov [edx+240+21], byte 0xff ; "Discover" options
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mov [dhcpMsgLen], dword 262 ; end of options marker
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jmp send_dhcpmsg
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request_options:
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mov [edx+240+21], word 0x0436 ; server IP
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mov eax, [dhcpServerIP]
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mov [edx+240+23], eax
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mov [edx+240+27], byte 0xff ; end of options marker
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mov [dhcpMsgLen], dword 268
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send_dhcpmsg:
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mcall 75, 6, [socketNum], [dhcpMsg], [dhcpMsgLen] ; write to socket ( send broadcast request )
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mov eax, [dhcpMsg] ; Setup the DHCP buffer to receive response
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mov [dhcpMsgLen], eax ; Used as a pointer to the data
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mcall 23, TIMEOUT*10 ; wait for data
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read_data: ; we have data - this will be the response
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mcall 75, 7, [socketNum], [dhcpMsg], BUFFER ; read data from socket
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DEBUGF 1,"->%d bytes received\n", eax
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cmp eax, -1
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je dhcp_error
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mov [dhcpMsgLen], eax
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; depending on which msg we sent, handle the response
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; accordingly.
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; If the response is to a dhcp discover, then:
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; 1) If response is DHCP OFFER then
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; 1.1) record server IP, lease time & IP address.
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; 1.2) send a request packet
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; If the response is to a dhcp request, then:
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; 1) If the response is DHCP ACK then
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; 1.1) extract the DNS & subnet fields. Set them in the stack
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cmp [dhcpMsgType], 0x01 ; did we send a discover?
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je discover
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cmp [dhcpMsgType], 0x03 ; did we send a request?
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je request
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call dhcp_end ; we should never reach here ;)
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jmp exit
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discover:
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call parse_response
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cmp [dhcpMsgType], 0x02 ; Was the response an offer?
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je send_request
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call dhcp_end
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jmp link_local
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send_request:
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mov [dhcpMsgType], 0x03 ; make it a request
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jmp build_request
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request:
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call parse_response
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cmp [dhcpMsgType], 0x05 ; Was the response an ACK? It should be
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jne read_data ; NO - read next packets
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call dhcp_end
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mcall 76, API_IPv4 + 3, [dhcp.ip] ; ip
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mcall 76, API_IPv4 + 5, [dhcp.dns] ; dns
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mcall 76, API_IPv4 + 7, [dhcp.subnet] ; subnet
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mcall 76, API_IPv4 + 9, [dhcp.gateway] ; gateway
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jmp exit
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dhcp_end:
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mcall close, [socketNum]
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stdcall mem.Free, [dhcpMsg]
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ret
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;***************************************************************************
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; Function
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; parseResponse
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;
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; Description
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; extracts the fields ( client IP address and options ) from
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; a DHCP response
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; The values go into
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; dhcpMsgType,dhcpLease,dhcpClientIP,dhcpServerIP,
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; dhcpDNSIP, dhcpSubnet
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; The message is stored in dhcpMsg
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;
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;***************************************************************************
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parse_response:
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DEBUGF 1,"Data received, parsing response\n"
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mov edx, [dhcpMsg]
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push dword [edx+16]
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pop [dhcp.ip]
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DEBUGF 1,"Client: %u.%u.%u.%u\n", [edx+16]:1, [edx+17]:1, [edx+18]:1, [edx+19]:1
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; TODO: check if there really are options
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mov al, 240 ; Point to first option
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movzx ecx, al
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.next_option:
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add edx, ecx
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mov al, [edx] ; get message identifier
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cmp al, 0xff ; End of options?
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je .done
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cmp al, 0
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je .pad
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; TODO: check if we still are inside the buffer
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inc edx
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movzx ecx, byte [edx] ; get data length
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inc edx ; point to data
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cmp al, dhcp_msg_type ; Msg type is a single byte option
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je .msgtype
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cmp al, dhcp_dhcp_server_id
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je .server
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cmp al, dhcp_address_time
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je .lease
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cmp al, dhcp_subnet_mask
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je .subnet
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cmp al, dhcp_router
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je .router
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cmp al, dhcp_domain_server
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je .dns
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DEBUGF 1,"Unsupported DHCP option: %u\n", al
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jmp .next_option
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.pad:
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xor ecx, ecx
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inc ecx
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jmp .next_option
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.msgtype:
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mov al, [edx]
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mov [dhcpMsgType], al
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DEBUGF 1,"DHCP Msg type: %u\n", al
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jmp .next_option ; Get next option
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.server:
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mov eax, [edx]
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mov [dhcpServerIP], eax
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DEBUGF 1,"Server: %u.%u.%u.%u\n",[edx]:1,[edx+1]:1,[edx+2]:1,[edx+3]:1
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jmp .next_option
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.lease:
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pusha
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mov eax,[edx]
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bswap eax
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mov [dhcpLease],eax
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DEBUGF 1,"lease: %d\n",eax
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popa
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jmp .next_option
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.subnet:
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push dword [edx]
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pop [dhcp.subnet]
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DEBUGF 1,"Subnet: %u.%u.%u.%u\n",[edx]:1,[edx+1]:1,[edx+2]:1,[edx+3]:1
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jmp .next_option
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.router:
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push dword [edx]
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pop [dhcp.gateway]
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DEBUGF 1,"Gateway: %u.%u.%u.%u\n",[edx]:1,[edx+1]:1,[edx+2]:1,[edx+3]:1
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jmp .next_option
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.dns:
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push dword [edx]
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pop [dhcp.dns]
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DEBUGF 1,"DNS: %u.%u.%u.%u\n",[edx]:1,[edx+1]:1,[edx+2]:1,[edx+3]:1
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jmp .next_option
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.done:
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ret
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dhcp_error:
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call dhcp_end
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link_local:
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call random
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mov cx, ax
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shl ecx, 16
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mov cx, 0xfea9 ; IP 169.254.0.0 link local net, see RFC3927
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mcall 76, API_IPv4 + 3, ecx ; mask is 255.255.0.0
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DEBUGF 1,"Link Local IP assinged: 169.254.%u.%u\n", [generator+0]:1, [generator+1]:1
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mcall 76, API_IPv4 + 7, 0xffff
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mcall 76, API_IPv4 + 9, 0x0
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mcall 76, API_IPv4 + 5, 0x0
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mcall 5, PROBE_WAIT*100
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xor esi, esi
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probe_loop:
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call random ; create a pseudo random number in eax (seeded by MAC)
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cmp al, PROBE_MIN*100 ; check if al is bigger then PROBE_MIN
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jae @f ; all ok
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add al, (PROBE_MAX-PROBE_MIN)*100 ; al is too small
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@@:
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cmp al, PROBE_MAX*100
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jbe @f
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sub al, (PROBE_MAX-PROBE_MIN)*100
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@@:
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movzx ebx,al
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DEBUGF 1,"Waiting %u0ms\n",ebx
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mcall 5
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DEBUGF 1,"Sending Probe\n"
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mcall 76, API_ARP + 6
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inc esi
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cmp esi, PROBE_NUM
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jb probe_loop
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; now we wait further ANNOUNCE_WAIT seconds and send ANNOUNCE_NUM ARP announces. If any other host has assingned
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; IP within this time, we should create another adress, that have to be done later
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DEBUGF 1,"Waiting %us\n", ANNOUNCE_WAIT
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mcall 5, ANNOUNCE_WAIT*100
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xor esi, esi
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announce_loop:
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DEBUGF 1,"Sending Announce\n"
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mcall 76, API_ARP + 6
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inc esi
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cmp esi,ANNOUNCE_NUM
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je @f
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DEBUGF 1,"Waiting %us\n", ANNOUNCE_INTERVAL
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mcall 5, ANNOUNCE_INTERVAL*100
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jmp announce_loop
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@@:
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error:
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DEBUGF 1,"Socket error\n"
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exit: ; we should, instead of closing, detect ARP conflicts and detect if cable keeps connected ;)
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mcall -1
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random: ; Pseudo random actually
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mov eax, [generator]
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add eax, -43ab45b5h
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ror eax, 1
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bswap eax
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xor eax, dword[MAC]
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ror eax, 1
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xor eax, dword[MAC+2]
|
|
mov [generator], eax
|
|
|
|
ret
|
|
|
|
; DATA AREA
|
|
|
|
align 16
|
|
@IMPORT:
|
|
|
|
library \
|
|
libini,'libini.obj'
|
|
|
|
import libini, \
|
|
ini.get_str,'ini_get_str'
|
|
|
|
include_debug_strings
|
|
|
|
str_ip db 'ip', 0
|
|
str_subnet db 'subnet', 0
|
|
str_gateway db 'gateway', 0
|
|
str_dns db 'dns', 0
|
|
str_ipconfig db 'ipconfig', 0
|
|
str_type db 'type', 0
|
|
|
|
|
|
sockaddr1:
|
|
|
|
dw AF_INET4
|
|
dw 68 shl 8 ; local port
|
|
dd 0 ; local IP
|
|
|
|
rb 10
|
|
|
|
|
|
sockaddr2:
|
|
|
|
dw AF_INET4
|
|
dw 67 shl 8 ; destination port
|
|
dd -1 ; destination IP
|
|
|
|
rb 10
|
|
|
|
path db '/sys/network.ini'
|
|
|
|
IM_END:
|
|
|
|
inibuf rb 16
|
|
|
|
dhcpMsgType db ?
|
|
dhcpLease dd ?
|
|
dhcpServerIP dd ?
|
|
|
|
dhcp:
|
|
.ip dd ?
|
|
.subnet dd ?
|
|
.dns dd ?
|
|
.gateway dd ?
|
|
|
|
|
|
dhcpMsgLen dd ?
|
|
socketNum dd ?
|
|
|
|
MAC dp ?
|
|
|
|
currTime dd ?
|
|
generator dd ?
|
|
|
|
dhcpMsg dd ?
|
|
|
|
I_END: |