;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
;; ;;
;; Copyright (C) KolibriOS team 2010-2013. All rights reserved. ;;
;; Distributed under terms of the GNU General Public License ;;
;; ;;
;; zeroconfig.asm - Zeroconfig service for KolibriOS ;;
;; ;;
;; Written by hidnplayr@kolibrios.org ;;
;; Some code contributed by Derpenguin ;;
;; ;;
;; DHCP code is based on that by Mike Hibbet ;;
; (DHCP client for menuetos) ;;
;; ;;
;; GNU GENERAL PUBLIC LICENSE ;;
;; Version 2, June 1991 ;;
;; ;;
;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
format binary as ""
use32
org 0x0
db 'MENUET01' ; 8 byte id
dd 0x01 ; header version
dd START ; start of code
dd IM_END ; size of image
dd (I_END+0x100) ; memory for app
dd (I_END+0x100) ; esp
dd 0x0 , path ; I_Param , I_Icon
; CONFIGURATION
TIMEOUT equ 60 ; in seconds
BUFFER equ 1024 ; in bytes
__DEBUG__ equ 1 ; enable/disable
__DEBUG_LEVEL__ equ 1 ; 1 = all, 2 = errors
; CONFIGURATION FOR LINK-LOCAL
PROBE_WAIT equ 1 ; second (initial random delay)
PROBE_MIN equ 1 ; second (minimum delay till repeated probe)
PROBE_MAX equ 2 ; seconds (maximum delay till repeated probe)
PROBE_NUM equ 3 ; (number of probe packets)
ANNOUNCE_NUM equ 2 ; (number of announcement packets)
ANNOUNCE_INTERVAL equ 2 ; seconds (time between announcement packets)
ANNOUNCE_WAIT equ 2 ; seconds (delay before announcing)
MAX_CONFLICTS equ 10 ; (max conflicts before rate limiting)
RATE_LIMIT_INTERVAL equ 60 ; seconds (delay between successive attempts)
DEFEND_INTERVAL equ 10 ; seconds (min. wait between defensive ARPs)
include '../proc32.inc'
include '../macros.inc'
include '../debug-fdo.inc'
include '../network.inc'
include 'dhcp.inc'
include '../dll.inc'
Ip2dword:
push edx
; This code validates if the query is an IP containing 4 numbers and 3 dots
xor al, al ; make al (dot count) zero
@@:
cmp byte[edx],'0' ; check if this byte is a number, if not jump to no_IP
jl no_IP ;
cmp byte[edx],'9' ;
jg no_IP ;
inc edx ; the byte was a number, so lets check the next byte
cmp byte[edx],0 ; is this byte zero? (have we reached end of query?)
jz @f ; jump to next @@ then
cmp byte[edx],':'
jz @f
cmp byte[edx],'.' ; is this byte a dot?
jne @r ; if not, jump to previous @@
inc al ; the byte was a dot so increment al(dot count)
inc edx ; next byte
jmp @r ; lets check for numbers again (jump to previous @@)
@@: ; we reach this when end of query reached
cmp al,3 ; check if there where 3 dots
jnz no_IP ; if not, jump to no_IP
; The following code will convert this IP into a dword and output it in eax
; If there is also a port number specified, this will be returned in ebx, otherwise ebx is -1
pop esi ; edx (query address) was pushed onto stack and is now popped in esi
xor edx, edx ; result
xor eax, eax ; current character
xor ebx, ebx ; current byte
.outer_loop:
shl edx, 8
add edx, ebx
xor ebx, ebx
.inner_loop:
lodsb
test eax, eax
jz .finish
cmp al, '.'
jz .outer_loop
sub eax, '0'
imul ebx, 10
add ebx, eax
jmp .inner_loop
.finish:
shl edx, 8
add edx, ebx
bswap edx ; we want little endian order
ret
no_IP:
pop edx
xor edx, edx
ret
START:
mcall 40, EVM_STACK2
DEBUGF 1,">Zero-config service loaded\n"
.wait:
mcall 76, API_ETH + 4 ; get MAC of ethernet interface 0
cmp eax, -1
jne .start
mcall 10
jmp .wait
.start:
mcall 40, EVM_STACK
mov word[MAC], bx
mov dword[MAC+2], eax
DEBUGF 1,"->MAC: %x-%x-%x-%x-%x-%x\n",[MAC]:2,[MAC+1]:2,[MAC+2]:2,[MAC+3]:2,[MAC+4]:2,[MAC+5]:2
mov edi, path ; Calculate the length of zero-terminated string
xor al, al
mov ecx, 1024
repne scasb
dec edi
mov esi, filename ; append with .ini
movsd
movsb
DEBUGF 1,"->Loading ini %s\n", path
mcall 68, 11
stdcall dll.Load,@IMPORT
or eax, eax
jnz try_dhcp
invoke ini.get_str, path, str_ipconfig, str_type, inibuf, 16, 0
cmp dword[inibuf], 'stat'
jne try_dhcp
invoke ini.get_str, path, str_ipconfig, str_ip, inibuf, 16, 0
mov edx, inibuf
call Ip2dword
mcall 76, API_IPv4 + 3, edx
invoke ini.get_str, path, str_ipconfig, str_gateway, inibuf, 16, 0
mov edx, inibuf
call Ip2dword
mcall 76, API_IPv4 + 9, edx
invoke ini.get_str, path, str_ipconfig, str_dns, inibuf, 16, 0
mov edx, inibuf
call Ip2dword
mcall 76, API_IPv4 + 5, edx
invoke ini.get_str, path, str_ipconfig, str_subnet, inibuf, 16, 0
mov edx, inibuf
call Ip2dword
mcall 76, API_IPv4 + 7, edx
mcall -1
try_dhcp:
DEBUGF 1,"->Trying DHCP\n"
mcall 75, 0, AF_INET4, SOCK_DGRAM, 0 ; open socket (parameters: domain, type, reserved)
cmp eax, -1
je error
mov [socketNum], eax
DEBUGF 1,"->Socket %x opened\n", eax
mcall 75, 2, [socketNum], sockaddr1, 18 ; bind socket to local port 68
cmp eax, -1
je error
DEBUGF 1,"->Socket Bound to local port 68\n"
mcall 75, 4, [socketNum], sockaddr2, 18 ; connect to 255.255.255.255 on port 67
cmp eax, -1
je error
DEBUGF 1,"->Connected to 255.255.255.255 on port 67\n"
mov [dhcpMsgType], 0x01 ; DHCP discover
mov [dhcpLease], esi ; esi is still -1 (-1 = forever)
mcall 26, 9 ; Get system time
imul eax, 100
mov [currTime], eax
build_request: ; Creates a DHCP request packet.
DEBUGF 1,"->Building request\n"
stdcall mem.Alloc, BUFFER
mov [dhcpMsg], eax
test eax, eax
jz dhcp_error
;;; todo: skip this bullcrap
mov edi, eax
mov ecx, BUFFER
xor eax, eax
rep stosb
;; todo: put this in a buffer instead of writing bytes and words!
mov edx, [dhcpMsg]
; Boot protocol legacy
mov [edx], byte 0x01 ; Boot request
mov [edx+1], byte 0x01 ; Ethernet
mov [edx+2], byte 0x06 ; Ethernet h/w len
mov [edx+4], dword 0x11223344 ; xid ;;;;;;;
mov eax, [currTime]
mov [edx+8], eax ; secs, our uptime
mov [edx+10], byte 0x80 ; broadcast flag set
mov eax, dword [MAC] ; first 4 bytes of MAC
mov [edx+28],dword eax
mov ax, word [MAC+4] ; last 2 bytes of MAC
mov [edx+32],word ax
; DHCP extension
mov [edx+236], dword 0x63538263 ; magic cookie
mov [edx+240], word 0x0135 ; option DHCP msg type
mov al, [dhcpMsgType]
mov [edx+240+2], al
mov [edx+240+3], word 0x0433 ; option Lease time = infinity
mov eax, [dhcpLease]
mov [edx+240+5], eax
mov [edx+240+9], word 0x0432 ; option requested IP address
mov eax, [dhcp.ip]
mov [edx+240+11], eax
mov [edx+240+15], word 0x0437 ; option request list
mov [edx+240+17], dword 0x0f060301
cmp [dhcpMsgType], byte 0x01 ; Check which msg we are sending
jne request_options
mov [edx+240+21], byte 0xff ; "Discover" options
mov [dhcpMsgLen], dword 262 ; end of options marker
jmp send_dhcpmsg
request_options:
mov [edx+240+21], word 0x0436 ; server IP
mov eax, [dhcpServerIP]
mov [edx+240+23], eax
mov [edx+240+27], byte 0xff ; end of options marker
mov [dhcpMsgLen], dword 268
send_dhcpmsg:
mcall 75, 6, [socketNum], [dhcpMsg], [dhcpMsgLen] ; write to socket ( send broadcast request )
mov eax, [dhcpMsg] ; Setup the DHCP buffer to receive response
mov [dhcpMsgLen], eax ; Used as a pointer to the data
mcall 23, TIMEOUT*10 ; wait for data
read_data: ; we have data - this will be the response
mcall 75, 7, [socketNum], [dhcpMsg], BUFFER ; read data from socket
DEBUGF 1,"->%d bytes received\n", eax
cmp eax, -1
je dhcp_error
mov [dhcpMsgLen], eax
; depending on which msg we sent, handle the response
; accordingly.
; If the response is to a dhcp discover, then:
; 1) If response is DHCP OFFER then
; 1.1) record server IP, lease time & IP address.
; 1.2) send a request packet
; If the response is to a dhcp request, then:
; 1) If the response is DHCP ACK then
; 1.1) extract the DNS & subnet fields. Set them in the stack
cmp [dhcpMsgType], 0x01 ; did we send a discover?
je discover
cmp [dhcpMsgType], 0x03 ; did we send a request?
je request
call dhcp_end ; we should never reach here ;)
jmp exit
discover:
call parse_response
cmp [dhcpMsgType], 0x02 ; Was the response an offer?
je send_request
call dhcp_end
jmp link_local
send_request:
mov [dhcpMsgType], 0x03 ; make it a request
jmp build_request
request:
call parse_response
cmp [dhcpMsgType], 0x05 ; Was the response an ACK? It should be
jne read_data ; NO - read next packets
call dhcp_end
mcall 76, API_IPv4 + 3, [dhcp.ip] ; ip
mcall 76, API_IPv4 + 5, [dhcp.dns] ; dns
mcall 76, API_IPv4 + 7, [dhcp.subnet] ; subnet
mcall 76, API_IPv4 + 9, [dhcp.gateway] ; gateway
jmp exit
dhcp_end:
mcall close, [socketNum]
stdcall mem.Free, [dhcpMsg]
ret
;***************************************************************************
; Function
; parseResponse
;
; Description
; extracts the fields ( client IP address and options ) from
; a DHCP response
; The values go into
; dhcpMsgType,dhcpLease,dhcpClientIP,dhcpServerIP,
; dhcpDNSIP, dhcpSubnet
; The message is stored in dhcpMsg
;
;***************************************************************************
parse_response:
DEBUGF 1,"Data received, parsing response\n"
mov edx, [dhcpMsg]
push dword [edx+16]
pop [dhcp.ip]
DEBUGF 1,"Client: %u.%u.%u.%u\n", [edx+16]:1, [edx+17]:1, [edx+18]:1, [edx+19]:1
; TODO: check if there really are options
mov al, 240 ; Point to first option
movzx ecx, al
.next_option:
add edx, ecx
mov al, [edx] ; get message identifier
cmp al, 0xff ; End of options?
je .done
cmp al, 0
je .pad
; TODO: check if we still are inside the buffer
inc edx
movzx ecx, byte [edx] ; get data length
inc edx ; point to data
cmp al, dhcp_msg_type ; Msg type is a single byte option
je .msgtype
cmp al, dhcp_dhcp_server_id
je .server
cmp al, dhcp_address_time
je .lease
cmp al, dhcp_subnet_mask
je .subnet
cmp al, dhcp_router
je .router
cmp al, dhcp_domain_server
je .dns
DEBUGF 1,"Unsupported DHCP option: %u\n", al
jmp .next_option
.pad:
xor ecx, ecx
inc ecx
jmp .next_option
.msgtype:
mov al, [edx]
mov [dhcpMsgType], al
DEBUGF 1,"DHCP Msg type: %u\n", al
jmp .next_option ; Get next option
.server:
mov eax, [edx]
mov [dhcpServerIP], eax
DEBUGF 1,"Server: %u.%u.%u.%u\n",[edx]:1,[edx+1]:1,[edx+2]:1,[edx+3]:1
jmp .next_option
.lease:
pusha
mov eax,[edx]
bswap eax
mov [dhcpLease],eax
DEBUGF 1,"lease: %d\n",eax
popa
jmp .next_option
.subnet:
push dword [edx]
pop [dhcp.subnet]
DEBUGF 1,"Subnet: %u.%u.%u.%u\n",[edx]:1,[edx+1]:1,[edx+2]:1,[edx+3]:1
jmp .next_option
.router:
push dword [edx]
pop [dhcp.gateway]
DEBUGF 1,"Gateway: %u.%u.%u.%u\n",[edx]:1,[edx+1]:1,[edx+2]:1,[edx+3]:1
jmp .next_option
.dns:
push dword [edx]
pop [dhcp.dns]
DEBUGF 1,"DNS: %u.%u.%u.%u\n",[edx]:1,[edx+1]:1,[edx+2]:1,[edx+3]:1
jmp .next_option
.done:
ret
dhcp_error:
call dhcp_end
link_local:
call random
mov cx, ax
shl ecx, 16
mov cx, 0xfea9 ; IP 169.254.0.0 link local net, see RFC3927
mcall 76, API_IPv4 + 3, ecx ; mask is 255.255.0.0
DEBUGF 1,"Link Local IP assinged: 169.254.%u.%u\n", [generator+0]:1, [generator+1]:1
mcall 76, API_IPv4 + 7, 0xffff
mcall 76, API_IPv4 + 9, 0x0
mcall 76, API_IPv4 + 5, 0x0
mcall 5, PROBE_WAIT*100
xor esi, esi
probe_loop:
call random ; create a pseudo random number in eax (seeded by MAC)
cmp al, PROBE_MIN*100 ; check if al is bigger then PROBE_MIN
jae @f ; all ok
add al, (PROBE_MAX-PROBE_MIN)*100 ; al is too small
@@:
cmp al, PROBE_MAX*100
jbe @f
sub al, (PROBE_MAX-PROBE_MIN)*100
@@:
movzx ebx,al
DEBUGF 1,"Waiting %u0ms\n",ebx
mcall 5
DEBUGF 1,"Sending Probe\n"
mcall 76, API_ARP + 6
inc esi
cmp esi, PROBE_NUM
jb probe_loop
; now we wait further ANNOUNCE_WAIT seconds and send ANNOUNCE_NUM ARP announces. If any other host has assingned
; IP within this time, we should create another adress, that have to be done later
DEBUGF 1,"Waiting %us\n", ANNOUNCE_WAIT
mcall 5, ANNOUNCE_WAIT*100
xor esi, esi
announce_loop:
DEBUGF 1,"Sending Announce\n"
mcall 76, API_ARP + 6
inc esi
cmp esi,ANNOUNCE_NUM
je @f
DEBUGF 1,"Waiting %us\n", ANNOUNCE_INTERVAL
mcall 5, ANNOUNCE_INTERVAL*100
jmp announce_loop
@@:
error:
DEBUGF 1,"Socket error\n"
exit: ; we should, instead of closing, detect ARP conflicts and detect if cable keeps connected ;)
mcall -1
random: ; Pseudo random actually
mov eax, [generator]
add eax, -43ab45b5h
ror eax, 1
bswap eax
xor eax, dword[MAC]
ror eax, 1
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
filename db '.ini', 0
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
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_2:
path rb 1024+5
rb 65536
I_END: