; Zero-config
; v 1.4
;
; DHCP code is based on that by Mike Hibbet (DHCP client for menuetos)
;
; Written by HidnPlayr & Derpenguin
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: ; start of execution
mcall 40, 1 shl 7 ; network event
DEBUGF 1,">Zero-config service:\n"
mcall 75, 1337 shl 16 + 4
cmp eax, -1
je exit
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
cld
mov edi, path ; Calculate the length of zero-terminated string
xor al , al
mov ecx, 1024
repnz scas byte[es:edi]
dec edi
mov esi, filename
movsd
movsb
DEBUGF 1,"->path to ini: %s\n", path
mcall 68,11
stdcall dll.Load,@IMPORT
or eax,eax
jnz skip_ini
invoke ini.get_str, path, str_ipconfig, str_type, inibuf, 16, 0
mov eax,dword[inibuf]
cmp eax,'stat'
jne skip_ini
invoke ini.get_str, path, str_ipconfig, str_ip, inibuf, 16, 0
mov edx, inibuf
call Ip2dword
mcall 75, 3, edx
invoke ini.get_str, path, str_ipconfig, str_gateway, inibuf, 16, 0
mov edx, inibuf
call Ip2dword
mcall 75, 9, edx
invoke ini.get_str, path, str_ipconfig, str_dns, inibuf, 16, 0
mov edx, inibuf
call Ip2dword
mcall 75, 5, edx
invoke ini.get_str, path, str_ipconfig, str_subnet, inibuf, 16, 0
mov edx, inibuf
call Ip2dword
mcall 75, 7, edx
mcall -1
skip_ini:
DEBUGF 1,"->Skip ini\n"
mcall 74, 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 74, 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 74, 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 byte [dhcpMsgType], 0x01 ; DHCP discover
mov dword [dhcpLease], esi ; esi is still -1 (-1 = forever)
mcall 26, 9
imul eax,100
mov [currTime],eax
buildRequest: ; Creates a DHCP request packet.
DEBUGF 1,"->Building request\n"
stdcall mem.Alloc, BUFFER
mov [dhcpMsg], eax
test eax,eax
jz apipa
;;; todo: skip this bullcrap
mov edi, eax
mov ecx, BUFFER
xor eax, eax
cld
rep stosb
;; todo: put this in a buffer instead of writing bytes and words!
mov edx,[dhcpMsg]
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
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, [dhcpClientIP]
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_request
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_request:
mcall 74, 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 74, 7, [socketNum], [dhcpMsg], BUFFER ; read data from socket
DEBUGF 1,"->%d bytes received\n", eax
push eax
mcall 74, 1, [socketNum] ; exit the socket
pop eax
cmp eax, -1
je 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], byte 0x01 ; did we send a discover?
je discover
cmp [dhcpMsgType], byte 0x03 ; did we send a request?
je request
jmp exit ; really unknown, what we did
discover:
call parseResponse
cmp [dhcpMsgType], byte 0x02 ; Was the response an offer?
jne apipa ; NO - so we do zeroconf
mov [dhcpMsgType], byte 0x03 ; DHCP request
jmp buildRequest
request:
call parseResponse
cmp [dhcpMsgType], byte 0x05 ; Was the response an ACK? It should be
jne apipa ; NO - so we do zeroconf
jmp exit
;***************************************************************************
; 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
;
;***************************************************************************
parseResponse:
DEBUGF 1,"Data received, parsing response\n"
mov edx, [dhcpMsg]
pusha
mcall 75, 3, [edx+16]
mov eax,[edx]
mov [dhcpClientIP],eax
DEBUGF 1,"Client: %u.%u.%u.%u\n",[edx+16]:1,[edx+17]:1,[edx+18]:1,[edx+19]:1
popa
add edx, 240 ; Point to first option
xor ecx, ecx
next_option:
add edx, ecx
pr001:
mov al, [edx]
cmp al, 0xff ; End of options?
je pr_exit
cmp al, dhcp_msg_type ; Msg type is a single byte option
jne @f
mov al, [edx+2]
mov [dhcpMsgType], al
add edx, 3
jmp pr001 ; Get next option
@@:
inc edx
movzx ecx, byte [edx]
inc edx ; point to data
cmp al, dhcp_dhcp_server_id ; server ip
jne @f
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
@@:
cmp al, dhcp_address_time
jne @f
pusha
mov eax,[edx]
bswap eax
mov [dhcpLease],eax
DEBUGF 1,"lease: %d\n",eax
popa
jmp next_option
@@:
cmp al, dhcp_subnet_mask
jne @f
pusha
mcall 75, 7, [edx]
DEBUGF 1,"Subnet: %u.%u.%u.%u\n",[edx]:1,[edx+1]:1,[edx+2]:1,[edx+3]:1
popa
jmp next_option
@@:
cmp al, dhcp_router
jne @f
pusha
mcall 75, 9, [edx]
DEBUGF 1,"Gateway: %u.%u.%u.%u\n",[edx]:1,[edx+1]:1,[edx+2]:1,[edx+3]:1
popa
jmp next_option
@@:
cmp al, dhcp_domain_server
jne next_option
pusha
mcall 75, 5, [edx]
DEBUGF 1,"DNS: %u.%u.%u.%u\n",[edx]:1,[edx+1]:1,[edx+2]:1,[edx+3]:1
popa
jmp next_option
pr_exit:
; DEBUGF 1,"Sending ARP announce\n"
;;;
jmp exit
apipa:
stdcall mem.Free, [dhcpMsg]
link_local:
call random
mov ecx,0xfea9 ; IP 169.254.0.0 link local net, see RFC3927
mov cx,ax
mcall 75, 3, ecx ; mask is 255.255.0.0
DEBUGF 1,"Link Local IP assinged: 169.254.%u.%u\n",[generator+2]:1,[generator+3]:1
mcall 75, 5, 0xffff
mcall 75, 9, 0x0
mcall 75, 7, 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
jge @f ; all ok
add al,(PROBE_MAX-PROBE_MIN)*100 ; al is too small
@@:
cmp al,PROBE_MAX*100
jle @f
sub al,(PROBE_MAX-PROBE_MIN)*100
@@:
movzx ebx,al
DEBUGF 1,"Waiting %u0ms\n",ebx
mcall 5
DEBUGF 1,"Sending Probe\n"
; eth.ARP_PROBE MAC
inc esi
cmp esi,PROBE_NUM
jl 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"
; eth.ARP_ANNOUNCE MAC
inc esi
cmp esi,ANNOUNCE_NUM
je @f
DEBUGF 1,"Waiting %us\n",ANNOUNCE_INTERVAL
mcall 5, ANNOUNCE_INTERVAL*100
jmp announce_loop
@@:
; we should, instead of closing, detect ARP conflicts and detect if cable keeps connected ;)
error:
exit:
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 ; local port
dd 0 ; local IP
rb 10
sockaddr2:
dw AF_INET4
dw 67 ; destination port
dd -1 ; destination IP
rb 10
IM_END:
inibuf rb 16
dhcpClientIP dd ?
dhcpMsgType db ?
dhcpLease dd ?
dhcpServerIP dd ?
dhcpMsgLen dd ?
socketNum dd ?
MAC dp ?
currTime dd ?
renewTime dd ?
generator dd ?
dhcpMsg dd ?
I_END_2:
path rb 1024+5
rb 65536
I_END: