772 lines
24 KiB
NASM
772 lines
24 KiB
NASM
;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
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;; ;;
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;; Copyright (C) KolibriOS team 2010-2016. 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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; CONFIGURATION
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TIMEOUT = 5 ; in seconds
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BUFFER = 1024 ; in bytes
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DHCP_TRIES = 3 ; number of times to try contacting DHCP server
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__DEBUG__ = 1 ; enable/disable
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__DEBUG_LEVEL__ = 2 ; 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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MAX_INTERFACES = 8
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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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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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struct dhcp_msg
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op db ? ; Operation Code
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htype db ? ; Hardware type
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hlen db ? ; Hardware address length
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hops db ?
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xid dd ? ; Transaction Identifier
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secs dw ? ; Seconds since boot
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flags dw ?
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ciaddr dd ? ; Client IP address
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yiaddr dd ? ; "Your" IP address
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siaddr dd ? ; Server IP address
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giaddr dd ? ; Gateway IP address
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chaddr rb 16 ; Client hardware address
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sname rb 64 ; Server name
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file rb 128 ; boot filename
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cookie dd ? ; Magic cookie (0x63538263)
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options rb 512
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ends
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struct interface
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number dd ?
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state dd ? ; 0 - disconnected, 1 - connected
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mode dd ? ; 0 - disabled, 1 - static, 2 - dhcp, 3 - auto (zero config)
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tries dd ?
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lease dd ?
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ServerIP dd ?
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ip dd ?
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subnet dd ?
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dns dd ?
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gateway dd ?
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socketNum dd ?
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timeout dd ?
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ip_conflicts dd ?
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ends
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START:
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mcall 68, 11 ; init heap
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stdcall dll.Load, @IMPORT ; load libraries
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or eax, eax
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jnz exit_immediately
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DEBUGF 2, "Zero-config service loaded\n"
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mcall 40, EVM_STACK2 ; We only want low-level network events
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; Set up interface list
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mov edi, device_list
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xor ebx, ebx
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@@:
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inc ebx
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mov eax, ebx
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stosd
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mov ecx, sizeof.interface/4-1
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xor eax,eax
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rep stosd
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cmp ebx, MAX_INTERFACES
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jb @b
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mov ebp, device_list
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mainloop:
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cmp [ebp + interface.state], 0
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je .link_up?
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jmp .maintain_link
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.next:
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cmp [ebp + interface.number], MAX_INTERFACES
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je .wait
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add ebp, sizeof.interface
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jmp mainloop
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.wait:
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mcall 10 ; Wait for event
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mov ebp, device_list
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jmp mainloop
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.link_up?:
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mov bh, byte[ebp + interface.number]
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mov bl, 0 ; Get device type
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mcall 74
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cmp eax, 1 ; Ethernet
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jne mainloop.next
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mov bl, 10 ; Get Link status
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mcall 74
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test eax, eax
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jz mainloop.next
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mov [ebp + interface.state], 1
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call create_str_ini_int
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; Try to read settings from .ini file
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invoke ini.get_str, ini_path, str_ini_int, str_ip_type, inibuf, 16, str_null
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test eax, eax
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jz @f
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; If settings not found, use default settings from 'ip?' section
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mov dword[str_ini_int], 'ip?'
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@@:
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mov ebx, API_ETH + 0
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mov bh, byte[ebp + interface.number]
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mcall 76 ; get MAC of the ethernet interface
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mov word[tx_msg.chaddr], bx
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mov dword[tx_msg.chaddr+2], eax
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DEBUGF 1, "MAC: %x-%x-%x-%x-%x-%x\n", \
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[tx_msg.chaddr+0]:2, [tx_msg.chaddr+1]:2, [tx_msg.chaddr+2]:2, \
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[tx_msg.chaddr+3]:2, [tx_msg.chaddr+4]:2, [tx_msg.chaddr+5]:2
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invoke ini.get_str, ini_path, str_ini_int, str_ip_type, inibuf, 16, str_null
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test eax, eax
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jnz .invalid
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mov eax, dword[inibuf]
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or eax, 0x20202020
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mov [ebp + interface.mode], 0
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cmp eax, 'disa'
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je .next
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mov [ebp + interface.mode], 1
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cmp eax, 'stat'
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je static
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mov [ebp + interface.mode], 2
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cmp eax, 'dhcp'
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je dhcp
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mov [ebp + interface.mode], 3
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cmp eax, 'auto'
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je dhcp
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.invalid:
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DEBUGF 2, "Invalid settings for interface: %s.\n", str_ini_int
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jmp .next
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.maintain_link:
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; Check for IP conflicts
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mov ebx, API_ARP
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mov bh, byte[ebp + interface.number]
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mov bl, 7
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mcall 76 ; Number of IP conflicts
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cmp eax, [ebp + interface.ip_conflicts]
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je @f
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mov [ebp + interface.ip_conflicts], eax
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DEBUGF 2, "IP address conflict on interface %u\n", [ebp + interface.number]
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; Notify user of the IP address conflict
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mov [notify_struct.msg], str_conflict
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mcall 70, notify_struct
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@@:
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; Check if device is still there
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mov bh, byte[ebp + interface.number]
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mov bl, 0 ; Get device type
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mcall 74
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test eax, eax ; No device
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jz .link_down
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; Check if link is still there
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mov bl, 10 ; Get Link status
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mcall 74
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test eax, eax
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jnz .next
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.link_down:
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mov [ebp + interface.state], 0
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; Notify user that the link is down
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mov [notify_struct.msg], str_disconnected
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mcall 70, notify_struct
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; CHECKME: should we do this in kernel instead? Should we even do this at all?
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xor ecx, ecx
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mov ebx, API_IPv4 + 3
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mov bh, byte[ebp + interface.number]
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mcall 76 ; ip
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mov bl, 5
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mcall 76 ; dns
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mov bl, 7
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mcall 76 ; subnet
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mov bl, 9
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mcall 76 ; gateway
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jmp .next
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link_up:
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; Read number of previous IP conflicts
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mov ebx, API_ARP
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mov bh, byte[ebp + interface.number]
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mov bl, 7
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mcall 76
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mov [ebp + interface.ip_conflicts], eax
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; Notify user that the link is up and running
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mov [notify_struct.msg], str_connected
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mcall 70, notify_struct
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.fail:
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mcall 40, EVM_STACK2
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jmp mainloop.next
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static:
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DEBUGF 1, "Applying Static IP settings\n"
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invoke ini.get_str, ini_path, str_ini_int, str_ip, inibuf, 16, str_null
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mov esi, inibuf
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call ip_str_to_dword
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mov ebx, API_IPv4 + 3 ; set IP
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mov bh, byte[ebp + interface.number]
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mcall 76
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invoke ini.get_str, ini_path, str_ini_int, str_subnet, inibuf, 16, str_null
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mov esi, inibuf
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call ip_str_to_dword
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mov ebx, API_IPv4 + 7 ; set subnet
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mov bh, byte[ebp + interface.number]
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mcall 76
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invoke ini.get_str, ini_path, str_ini_int, str_gateway, inibuf, 16, str_null
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mov esi, inibuf
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call ip_str_to_dword
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mov ebx, API_IPv4 + 9 ; set gateway
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mov bh, byte[ebp + interface.number]
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mcall 76
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.dns:
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invoke ini.get_str, ini_path, str_ini_int, str_dns, inibuf, 16, str_null
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mov esi, inibuf
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call ip_str_to_dword
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mov ebx, API_IPv4 + 5 ; set DNS
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mov bh, byte[ebp + interface.number]
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mcall 76
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jmp link_up
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dhcp:
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DEBUGF 2, "Trying to contact DHCP server\n"
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mcall 40, EVM_STACK
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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 dhcp_error
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mov [ebp + interface.socketNum], eax
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DEBUGF 1, "Socket %x opened\n", eax
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mcall 75, 2, [ebp + interface.socketNum], sock_local, 18 ; bind socket to local port 68
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cmp eax, -1
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je socket_error
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DEBUGF 1, "Socket Bound to local port 68\n"
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pushd [ebp + interface.number]
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pushd 4 ; length of option
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pushd SO_BINDTODEVICE
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pushd SOL_SOCKET
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mcall 75, 8, [ebp + interface.socketNum], esp
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add esp, 16
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cmp eax, -1
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je socket_error
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DEBUGF 1, "Socket Bound to local interface %u\n", [ebp + interface.number]
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mcall 75, 4, [ebp + interface.socketNum], sock_remote, 18 ; connect to 255.255.255.255 on port 67
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cmp eax, -1
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je socket_error
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DEBUGF 1, "Connected to 255.255.255.255 on port 67\n"
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; Read preferred IP address from settings file
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invoke ini.get_str, ini_path, str_ini_int, str_ip, inibuf, 16, str_null
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mov esi, inibuf
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call ip_str_to_dword
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mov [ebp + interface.ip], ecx
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call random
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mov [tx_msg.xid], eax ; randomize session ID
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mov [tx_msg_type], 1 ; DHCP discover
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build_dhcp_packet:
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DEBUGF 1, "Building DHCP packet\n"
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mov [ebp + interface.tries], DHCP_TRIES
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; Boot protocol legacy
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mov [tx_msg.op], 1 ; Boot request
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mov [tx_msg.htype], 1 ; Ethernet
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mov [tx_msg.hlen], 6 ; Ethernet address h/w len
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mov [tx_msg.hops], 0
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mcall 26, 9 ; Time since boot
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xor edx, edx
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mov ebx, 100
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div ebx ; Divide by 100 to get number of seconds
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mov [tx_msg.secs], ax
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mov [tx_msg.flags], 0
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; DHCP extension
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mov [tx_msg.cookie], 0x63538263 ; magic cookie
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mov word[tx_msg+240], 0x0135 ; option DHCP msg type
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mov al,[tx_msg_type]
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mov [tx_msg+240+2], al
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mov word[tx_msg+240+3], 0x0433 ; option Lease time
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mov dword[tx_msg+240+5], -1 ; infinite
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mov word[tx_msg+240+9], 0x0432 ; option requested IP address
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mov eax,[ebp + interface.ip]
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mov [tx_msg+240+11], eax
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mov word[tx_msg+240+15], 0x0437 ; option request list
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mov dword[tx_msg+240+17], 0x0f060301
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cmp [tx_msg_type], 1 ; Check which msg we are sending
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jne .request
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mov byte[tx_msg+240+21], 0xff ; end of options marker
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mov [tx_msg_len], 262 ; length
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jmp send_dhcp_packet
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.request:
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mov word[tx_msg+240+21], 0x0436 ; server IP
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mov eax,[ebp + interface.ServerIP]
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mov [tx_msg+240+23], eax
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mov byte[tx_msg+240+27], 0xff ; end of options marker
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mov [tx_msg_len], 268 ; length
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send_dhcp_packet:
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DEBUGF 1, "Sending DHCP packet\n"
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lea edx, [tx_msg]
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mcall 75, 6, [ebp + interface.socketNum], , [tx_msg_len]
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; Wait for reply
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mcall 26, 9
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add eax, TIMEOUT*100
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mov [ebp + interface.timeout], eax
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mov ebx, TIMEOUT*100
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.wait:
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mcall 23 ; Wait for event with timeout
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read_packet: ; we have data - this will be the response
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lea edx, [rx_msg]
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mcall 75, 7, [ebp + interface.socketNum], , BUFFER, MSG_DONTWAIT ; read data from socket
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cmp eax, -1
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jne .got_data
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mcall 26, 9
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mov ebx, eax
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sub ebx, [ebp + interface.timeout]
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ja send_dhcp_packet.wait
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DEBUGF 1, "No answer from DHCP server\n"
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dec [ebp + interface.tries]
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jnz send_dhcp_packet
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jmp dhcp_fail
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.got_data:
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DEBUGF 1, "%d bytes received\n", eax
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mov [rx_msg_len], 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 [tx_msg_type], 1 ; did we send a discover?
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je discover_sent
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cmp [tx_msg_type], 3 ; did we send a request?
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je request_sent
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jmp exit_immediately
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discover_sent:
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call parse_dhcp_reply
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cmp [rx_msg_type], 2 ; Was the response an offer?
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jne read_packet
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DEBUGF 1, "Got offer, making request\n"
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mov [tx_msg_type], 3 ; make it a request
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jmp build_dhcp_packet
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request_sent:
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call parse_dhcp_reply
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cmp [rx_msg_type], 5 ; Was the response an ACK? It should be
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jne read_packet ; NO - read next packets
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DEBUGF 2, "IP address %u.%u.%u.%u assigned to network interface %u by DHCP\n",\
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[ebp+interface.ip+0]:1, [ebp+interface.ip+1]:1, [ebp+interface.ip+2]:1, [ebp+interface.ip+3]:1, [ebp + interface.number]:1
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mcall close, [ebp + interface.socketNum]
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mov ebx, API_IPv4 + 3
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mov bh, byte[ebp + interface.number]
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mcall 76, , [ebp + interface.ip] ; ip
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mov bl, 7
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mcall 76, , [ebp + interface.subnet] ; subnet
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mov bl, 9
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mcall 76, , [ebp + interface.gateway] ; gateway
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invoke ini.get_str, ini_path, str_ini_int, str_dns_type, inibuf, 16, str_null
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test eax, eax
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jnz @f
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mov eax, dword[inibuf]
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or eax, 0x202020
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cmp eax, 'stat'
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je static.dns
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@@:
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mov ebx, API_IPv4 + 5
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mov bh, byte[ebp + interface.number]
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mcall 76, , [ebp + interface.dns] ; dns
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jmp link_up
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parse_dhcp_reply:
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DEBUGF 1, "Parsing response\n"
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mov [rx_msg_type], 0
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; Verify if session ID matches
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mov eax, [tx_msg.xid]
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cmp [rx_msg.xid], eax
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jne .done
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pushd [rx_msg.yiaddr]
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pop [ebp + interface.ip]
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DEBUGF 1, "Client: %u.%u.%u.%u\n", \
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[rx_msg.yiaddr]:1, [rx_msg.yiaddr+1]:1, [rx_msg.yiaddr+2]:1, [rx_msg.yiaddr+3]:1
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; Verify magic cookie
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cmp [rx_msg.cookie], 0x63538263
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jne .done
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; Parse the DHCP options
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lea esi, [rx_msg]
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mov ecx, 240 ; point to the first option
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.next_option:
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; TODO: check if we still are inside the buffer!
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add esi, ecx
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lodsb ; get message identifier
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mov bl, al
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cmp bl, 0xff ; End of options?
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je .done
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test bl, bl
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jz .pad
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lodsb ; load data length
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movzx ecx, al
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cmp bl, dhcp_msg_type ; Msg type is a single byte option
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je .msgtype
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cmp bl, dhcp_dhcp_server_id
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je .server
|
|
cmp bl, dhcp_address_time
|
|
je .lease
|
|
cmp bl, dhcp_subnet_mask
|
|
je .subnet
|
|
cmp bl, dhcp_router
|
|
je .router
|
|
cmp bl, dhcp_domain_server
|
|
je .dns
|
|
|
|
DEBUGF 1, "Unsupported DHCP option: %u\n", bl
|
|
jmp .next_option
|
|
|
|
.pad:
|
|
xor ecx, ecx
|
|
inc ecx
|
|
jmp .next_option
|
|
|
|
.msgtype:
|
|
mov al, [esi]
|
|
mov [rx_msg_type], al
|
|
|
|
DEBUGF 1, "DHCP Msg type: %u\n", al
|
|
jmp .next_option ; Get next option
|
|
|
|
.server:
|
|
pushd [esi]
|
|
pop [ebp + interface.ServerIP]
|
|
DEBUGF 1, "Server: %u.%u.%u.%u\n", [esi]:1, [esi+1]:1, [esi+2]:1, [esi+3]:1
|
|
jmp .next_option
|
|
|
|
.lease:
|
|
pusha
|
|
mov eax,[esi]
|
|
bswap eax
|
|
mov [ebp + interface.lease], eax
|
|
DEBUGF 1, "Lease: %d\n", eax
|
|
popa
|
|
jmp .next_option
|
|
|
|
.subnet:
|
|
pushd [esi]
|
|
pop [ebp + interface.subnet]
|
|
DEBUGF 1, "Subnet: %u.%u.%u.%u\n", [esi]:1, [esi+1]:1, [esi+2]:1, [esi+3]:1
|
|
jmp .next_option
|
|
|
|
.router:
|
|
pushd [esi]
|
|
pop [ebp + interface.gateway]
|
|
DEBUGF 1, "Gateway: %u.%u.%u.%u\n", [esi]:1, [esi+1]:1, [esi+2]:1, [esi+3]:1
|
|
jmp .next_option
|
|
|
|
.dns:
|
|
pushd [esi]
|
|
pop [ebp + interface.dns]
|
|
DEBUGF 1, "DNS: %u.%u.%u.%u\n", [esi]:1, [esi+1]:1, [esi+2]:1, [esi+3]:1
|
|
jmp .next_option
|
|
|
|
.done:
|
|
ret
|
|
|
|
exit_immediately:
|
|
DEBUGF 2, "Zeroconf failed!\n"
|
|
mcall -1
|
|
|
|
socket_error:
|
|
DEBUGF 2, "Socket error!\n"
|
|
|
|
dhcp_fail:
|
|
mcall close, [ebp + interface.socketNum]
|
|
|
|
dhcp_error:
|
|
DEBUGF 2, "DHCP failed\n"
|
|
cmp [ebp + interface.mode], 3 ; zero config mode?
|
|
jne link_up
|
|
|
|
link_local:
|
|
|
|
; TODO: send ARP probes before setting the IP address in stack!
|
|
|
|
call random
|
|
mov cx, ax
|
|
shl ecx, 16
|
|
mov cx, 0xfea9 ; IP 169.254.0.0 link local net, see RFC3927
|
|
mov ebx, API_IPv4 + 3
|
|
mov bh, byte[ebp + interface.number]
|
|
mcall 76, , ecx ; mask is 255.255.0.0
|
|
DEBUGF 2, "IP address 169.254.%u.%u assigned to network interface %u through Link-Local\n",\
|
|
[generator+0]:1, [generator+1]:1, [ebp + interface.number]:1
|
|
mov bl, 7
|
|
mcall 76, , 0xffff
|
|
mov bl, 9
|
|
mcall 76, , 0x0
|
|
mov bl, 5
|
|
mcall 76, , 0x0
|
|
|
|
jmp link_up
|
|
|
|
|
|
random: ; Pseudo random actually
|
|
|
|
mov eax,[generator]
|
|
add eax, -43ab45b5h
|
|
ror eax, 1
|
|
bswap eax
|
|
xor eax, dword[tx_msg.chaddr]
|
|
ror eax, 1
|
|
xor eax, dword[tx_msg.chaddr+2]
|
|
mov [generator], eax
|
|
|
|
ret
|
|
|
|
|
|
|
|
create_str_ini_int:
|
|
mov eax, [ebp + interface.number]
|
|
mov ebx, 10
|
|
xor edx, edx
|
|
push 0
|
|
@@:
|
|
div ebx
|
|
add dl, '0'
|
|
push edx
|
|
test eax, eax
|
|
jnz @r
|
|
@@:
|
|
mov edi, str_ini_int+2
|
|
@@:
|
|
pop eax
|
|
stosb
|
|
test eax, eax
|
|
jnz @r
|
|
|
|
ret
|
|
|
|
|
|
|
|
; In: esi = ptr to ASCIIZ IP address
|
|
; Out: ecx = IP (0 on error)
|
|
|
|
ip_str_to_dword:
|
|
|
|
xor ecx, ecx ; end result
|
|
.charloop:
|
|
lodsb
|
|
test al, al
|
|
jz .finish
|
|
cmp al, '.'
|
|
je .dot
|
|
sub al, '0'
|
|
jb .fail
|
|
cmp al, 9
|
|
ja .fail
|
|
mov dl, cl
|
|
shl cl, 2
|
|
jc .fail
|
|
add cl, dl
|
|
jc .fail
|
|
add cl, cl
|
|
jc .fail
|
|
add cl, al
|
|
jc .fail
|
|
jmp .charloop
|
|
.dot:
|
|
shl ecx, 8
|
|
jc .fail
|
|
xor cl, cl
|
|
jmp .charloop
|
|
.finish:
|
|
bswap ecx ; we want little endian order
|
|
ret
|
|
|
|
.fail:
|
|
xor ecx, ecx
|
|
ret
|
|
|
|
; DATA AREA
|
|
|
|
align 16
|
|
@IMPORT:
|
|
|
|
library \
|
|
libini, 'libini.obj'
|
|
|
|
import libini, \
|
|
ini.get_str, 'ini_get_str',\
|
|
ini.set_str, 'ini_set_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_ip_type db 'ip_type', 0
|
|
str_dns_type db 'dns_type', 0
|
|
|
|
str_ini_int db 'ip1', 0
|
|
rb 10
|
|
|
|
str_null db 0
|
|
|
|
sock_local:
|
|
dw AF_INET4
|
|
dw 68 shl 8 ; local port
|
|
dd 0 ; local IP
|
|
rb 10
|
|
|
|
|
|
sock_remote:
|
|
dw AF_INET4
|
|
dw 67 shl 8 ; destination port
|
|
dd -1 ; destination IP
|
|
rb 10
|
|
|
|
notify_struct:
|
|
dd 7 ; run application
|
|
dd 0
|
|
.msg dd 0
|
|
dd 0
|
|
dd 0
|
|
db '/sys/@notify', 0
|
|
|
|
str_connected db '"You are now connected to the network." -N', 0
|
|
str_disconnected db '"You are now disconnected from the network." -N', 0
|
|
str_conflict db '"An IP address conflict has been detected on the network." -W', 0
|
|
|
|
ini_path db '/sys/settings/network.ini',0
|
|
|
|
IM_END:
|
|
|
|
generator dd ?
|
|
|
|
inibuf rb 16
|
|
|
|
tx_msg_len dd ?
|
|
rx_msg_len dd ?
|
|
tx_msg_type db ?
|
|
rx_msg_type db ?
|
|
tx_msg dhcp_msg
|
|
rx_msg dhcp_msg
|
|
|
|
device_list rd MAX_INTERFACES*sizeof.interface
|
|
|
|
I_END: |