Subversion Repositories Kolibri OS

;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;

;;                                                                 ;;

;; Copyright (C) KolibriOS team 2004-2009. All rights reserved.    ;;

;; Distributed under terms of the GNU General Public License       ;;

;;                                                                 ;;

;;  SOCKET.INC                                                     ;;

;;                                                                 ;;

;;                                                                 ;;

;;    Written by hidnplayr@kolibrios.org                           ;;

;;    based on code by mike.dld                                    ;;

;;                                                                 ;;

;;          GNU GENERAL PUBLIC LICENSE                             ;;

;;             Version 2, June 1991                                ;;

;;                                                                 ;;

;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;

$Revision: 1019 $

align 4

struct	 SOCKET

	 .PrevPtr		dd ? ; pointer to previous socket in list

	 .NextPtr		dd ? ; pointer to next socket in list

	 .Number		dd ? ; socket number (unique within single process)

	 .PID			dd ? ; application process id

	 .Domain		dd ? ; INET/UNIX/..

	 .Type			dd ? ; RAW/UDP/TCP/...

	 .Protocol		dd ? ; ICMP/IPv4/ARP/

	 .LocalIP		dd ? ; local IP address

	 .RemoteIP		dd ? ; remote IP address

	 .LocalPort		dw ? ; local port

	 .RemotePort		dw ? ; remote port

	 .OrigRemoteIP		dd ? ; original remote IP address (used to reset to LISTEN state)

	 .OrigRemotePort	dw ? ; original remote port (used to reset to LISTEN state)

	 .rxDataCount		dd ? ; rx data count

	 .TCBState		dd ? ; TCB state

	 .TCBTimer		dd ? ; TCB timer (seconds)

	 .ISS			dd ? ; initial send sequence

	 .IRS			dd ? ; initial receive sequence

	 .SND_UNA		dd ? ; sequence number of unack'ed sent Packets

	 .SND_NXT		dd ? ; bext send sequence number to use

	 .SND_WND		dd ? ; send window

	 .RCV_NXT		dd ? ; next receive sequence number to use

	 .RCV_WND		dd ? ; receive window

	 .SEG_LEN		dd ? ; segment length

	 .SEG_WND		dd ? ; segment window

	 .wndsizeTimer		dd ? ; window size timer

	 .lock			dd ? ; lock mutex

	 .backlog		dw ? ; Backlog

	 .rxData:		     ; receive data buffer here

ends

MAX_backlog	equ 20

; socket buffers

SOCKETBUFFSIZE		equ 4096  ; state + config + buffer.

SOCKETHEADERSIZE	equ SOCKET.rxData ; thus 4096 - SOCKETHEADERSIZE bytes data

uglobal

	net_sockets	rd 2

	last_UDP_port	dw ? ; These values give the number of the last used ephemeral port

	last_TCP_port	dw ? ;

endg

;-----------------------------------------------

;

; SOCKET_init

;

;  -

;

;  IN:  /

;  OUT: /

;

;-----------------------------------------------

align 4

socket_init:

	mov	[net_sockets], 0

	mov	[net_sockets + 4], 0

	mov	[last_UDP_port], MIN_EPHEMERAL_PORT

	mov	[last_TCP_port], MIN_EPHEMERAL_PORT

	ret

;-----------------------------------------------------------------------------

;

; Socket API (function 74)

;

;-----------------------------------------------------------------------------

align 4

sys_socket:

	test	bl, bl

	jz	socket_open	; 0

	dec	bl

	jz	socket_close	; 1

	dec	bl

	jz	socket_bind	; 2

	dec	bl

	jz	socket_listen	; 3

	dec	bl

	jz	socket_connect	; 4

	dec	bl

	jz	socket_accept	; 5

	dec	bl

	jz	socket_send	; 6

	dec	bl

	jz	socket_recv	; 7

s_error:

	mov	dword [esp+32],-1

	ret

;-----------------------------------------------

;

; SOCKET_open

;

;

;  IN:  domain in ecx

;       type in edx

;       protocol in esi

;  OUT: eax is socket num, -1 on error

;

;-----------------------------------------------

socket_open:

	DEBUGF	1,"socket_open: domain: %u, type: %u",ecx, edx

	call	net_socket_alloc

	or	eax, eax

	jz	s_error

	mov	[eax + SOCKET.Domain], ecx

	mov	[eax + SOCKET.Type], edx

	mov	[eax + SOCKET.Protocol], esi

	stdcall net_socket_addr_to_num, eax

	DEBUGF	1,", socketnumber: %u\n", eax

	mov	[esp+32], eax

	ret

;-----------------------------------------------

;

; SOCKET_bind

;

;  IN:  socket number in ecx

;       pointer to sockaddr struct in edx

;       length of that struct in esi

;  OUT: 0 on success

;

;-----------------------------------------------

socket_bind:

	DEBUGF	1,"Socket_bind: socknum: %u sockaddr: %x, length: %u, ",ecx,edx,esi

	stdcall net_socket_num_to_addr, ecx

	cmp	eax, -1

	jz	s_error

	cmp	esi, 2

	jl	s_error

	cmp	word [edx], AF_INET4

	je	.af_inet4

	jmp	s_error

  .af_inet4:

	cmp	esi, 6

	jl	s_error

	mov	bx, word [edx + 2]

	rol	bx,8			;;;

	DEBUGF	1,"local port: %u ",bx

	test	bx, bx

	jnz	.check_only

	mov	bx , [last_UDP_port]

  .find_port_loop:

	inc	bx

	inc	[last_UDP_port]

  .check_only:

	mov	esi, net_sockets

  .next_udp_socket:

	mov	esi, [esi + SOCKET.NextPtr]

	or	esi, esi

	jz	.udp_port_ok

	cmp	[esi + SOCKET.Type], IP_PROTO_UDP

	jne	.next_udp_socket

	cmp	[esi + SOCKET.LocalPort], bx

	jne	.next_udp_socket

	cmp	word [edx + 2], 0

	jne	s_error

	cmp	bx, MAX_EPHEMERAL_PORT

	jle	.find_port_loop

	mov	[last_UDP_port], MIN_EPHEMERAL_PORT

	jmp	s_error

  .udp_port_ok:

	mov	word [eax + SOCKET.LocalPort], bx

	mov	ebx, dword [edx + 4]

	mov	dword [eax + SOCKET.LocalIP], ebx

	DEBUGF	1,"local ip: %u.%u.%u.%u\n",\

	[eax + SOCKET.LocalIP]:1,[eax + SOCKET.LocalIP + 1]:1,[eax + SOCKET.LocalIP + 2]:1,[eax + SOCKET.LocalIP + 3]:1

	mov	dword [esp+32],0

	ret

;-----------------------------------------------

;

; SOCKET_connect

;

;

;  IN:  socket number in ecx

;       pointer to sockaddr struct in edx

;       length of that struct in esi

;  OUT: 0 on success

;

;-----------------------------------------------

align 4

socket_connect:

	DEBUGF	1,"Socket_connect: socknum: %u sockaddr: %x, length: %u,",ecx,edx,esi

	stdcall net_socket_num_to_addr, ecx

	cmp	eax, -1

	jz	s_error

	cmp	esi, 2

	jl	s_error

	cmp	word [edx], AF_INET4

	je	.af_inet4

	jmp	s_error

  .af_inet4:

	cmp	esi, 8

	jl	s_error

	cmp	[eax + SOCKET.Type], IP_PROTO_UDP

	je	.udp

	cmp	[eax + SOCKET.Type], IP_PROTO_ICMP

	je	.icmp

;        cmp     [eax + SOCKET.Type], IP_PROTO_TCP

;        je      .tcp

	jmp	s_error

  .udp:

	mov	bx , word [edx + 2]

	rol	bx, 8

	mov	word [eax + SOCKET.RemotePort], bx

	DEBUGF	1,"remote port: %u ",bx

	mov	ebx, dword [edx + 4]

	mov	dword [eax + SOCKET.RemoteIP], ebx

	DEBUGF	1,"remote ip: %u.%u.%u.%u\n",[edx+4]:1,[edx+5]:1,[edx+6]:1,[edx+7]:1

	mov	dword [esp+32],0

	ret

  .icmp:

	ret

  .tcp:

;local sockAddr dd ?

;        cmp     esi, SOCKET_PASSIVE

;        jne     .skip_port_check

;

;        push    ebx

;        mov     eax, ebx

;        xchg    al, ah

;        mov     ebx, net_sockets

;

;  .next_socket:

;        mov     ebx, [ebx + SOCKET.NextPtr]

;        or      ebx, ebx

;        jz      .last_socket

;        cmp     [ebx + SOCKET.TCBState], TCB_LISTEN

;        jne     .next_socket

;        cmp     [ebx + SOCKET.LocalPort], ax

;        jne     .next_socket

;

;        xchg    al, ah

;        DEBUGF  1, "K : error: port %u is listened by 0x%x\n", ax, ebx

;        pop     ebx

;        jmp     .error

;

;  .last_socket:

;        pop     ebx

;

;  .skip_port_check:

;        mov     [eax + SOCKET.wndsizeTimer], 0     ; Reset the window timer.

;

;        xchg    bh, bl

;        mov     [eax + SOCKET.LocalPort], bx

;        xchg    ch, cl

;        mov     [eax + SOCKET.RemotePort], cx

;        mov     [eax + SOCKET.OrigRemotePort], cx

;        mov     ebx, [IP_LIST]

;        mov     [eax + SOCKET.LocalIP], ebx

;        mov     [eax + SOCKET.RemoteIP], edx

;        mov     [eax + SOCKET.OrigRemoteIP], edx

;        mov     ebx, TCB_LISTEN

;        cmp     esi, SOCKET_PASSIVE

;        je      @f

;        mov     ebx, TCB_SYN_SENT

;    @@: mov     [eax + SOCKET.TCBState], ebx            ; Indicate the state of the TCB

;        cmp     ebx, TCB_LISTEN

;        je      .exit

	; Now, if we are in active mode, then we have to send a SYN to the specified remote port

;        mov     eax, EMPTY_QUEUE

;        call    dequeue

;        cmp     ax, NO_BUFFER

;        je      .exit

;        push    eax

;        mov     bl, TH_SYN

;        xor     ecx, ecx

;        stdcall build_tcp_Packet, [sockAddr]

;        mov     eax, NET1OUT_QUEUE

;        mov     edx, [IP_LIST]

;        mov     ecx, [sockAddr]

;        cmp     edx, [ecx + SOCKET.RemoteIP]

;        jne     .not_local

;        mov     eax, IPIN_QUEUE

;  .not_local:

	; Send it.

;        pop     ebx

;        call    queue

  .exit:

	xor	eax, eax

	ret

;-----------------------------------------------

;

; SOCKET_listen

;

;

;  IN:  socket number in ecx

;       backlog in edx

;  OUT: eax is socket num, -1 on error

;

;-----------------------------------------------

socket_listen:

	DEBUGF	1,"Socket_listen: socknum: %u backlog: %u\n",ecx,edx

	stdcall net_socket_num_to_addr, ecx

	cmp	eax, -1

	jz	s_error

	cmp	edx, MAX_backlog

	jl	.ok

	mov	dx , 20

  .ok:

	mov	[eax + SOCKET.backlog], dx

	; TODO: insert code for active connections like TCP

	mov	dword [esp+32], 0

	ret

;-----------------------------------------------

;

; SOCKET_accept

;

;

;  IN:  socket number in ecx

;       addr in edx

;       addrlen in esi

;  OUT: eax is socket num, -1 on error

;

;-----------------------------------------------

socket_accept:

	DEBUGF	1,"Socket_accept: socknum: %u sockaddr: %x, length: %u\n",ecx,edx,esi

	stdcall net_socket_num_to_addr, ecx

	or	eax, eax

	jz	s_error

	mov	esi, eax

	cmp	[esi + SOCKET.backlog], 0

	jz	s_error

	call	net_socket_alloc

	or	eax, eax

	jz	s_error

	mov	edi, eax

	dec	[esi + SOCKET.backlog]

	mov	ecx, (SOCKET.rxData+3)/4

	rep	movsd

	mov	[edi + SOCKET.backlog], 0

	; TODO: fill in structure in ecx

	mov	[esi + SOCKET.RemoteIP], 0

	mov	[esi + SOCKET.RemotePort], 0

	stdcall net_socket_addr_to_num, eax

	mov	[esp+32], eax

	ret

;-----------------------------------------------

;

; SOCKET_close

;

;

;  IN:  socket number in ecx

;  OUT: eax is socket num, -1 on error

;

;-----------------------------------------------

socket_close:

	DEBUGF	1,"Socket_close: socknum: %u\n",ecx

	stdcall net_socket_num_to_addr, ecx

	or	eax, eax

	jz	s_error

	cmp	[eax + SOCKET.Type], IP_PROTO_UDP

	je	.udp

	cmp	[eax + SOCKET.Type], IP_PROTO_ICMP

	je	.icmp

;        cmp     [eax + SOCKET.Type], IP_PROTO_TCP

;        je      .tcp

	jmp	s_error

  .udp:

	lea	ebx, [eax + SOCKET.lock]

	call	wait_mutex

	; TODO: mark the socket for deletion, using the mutex

	stdcall net_socket_free, eax

	mov	dword [esp+32],0

	ret

  .icmp:

	ret

  .tcp:

if 1 = 0

;local sockAddr dd ?

;        DEBUGF  1, "K : socket_close_tcp (0x%x)\n", ebx

	; first, remove any resend entries

	pusha

	mov	esi, resendQ

	mov	ecx, 0

  .next_resendq:

	cmp	ecx, NUMRESENDENTRIES

	je	.last_resendq	    ; None left

	cmp	[esi + 4], ebx

	je	@f		    ; found one

	inc	ecx

	add	esi, 8

	jmp	.next_resendq

    @@: mov	dword[esi + 4], 0

	inc	ecx

	add	esi, 8

	jmp	.next_resendq

  .last_resendq:

	popa

	mov	ebx, eax

;        mov     [sockAddr], eax

	cmp	[eax + SOCKET.TCBState], TCB_LISTEN

	je	.destroy_tcb

	cmp	[eax + SOCKET.TCBState], TCB_SYN_SENT

	je	.destroy_tcb

; Now construct the response, and queue for sending by IP

	mov	eax, EMPTY_QUEUE

	call	dequeue

	cmp	ax, NO_BUFFER

	je	.error

	push	eax

	mov	bl, TH_FIN

	xor	ecx, ecx

	xor	esi, esi

	stdcall build_tcp_Packet, [sockAddr]

	mov	 ebx, [sockAddr]

	; increament SND.NXT in socket

	lea	esi, [ebx + SOCKET.SND_NXT]

	call	inc_inet_esi

	; Get the socket state

	mov	eax, [ebx + SOCKET.TCBState]

	cmp	eax, TCB_SYN_RECEIVED

	je	.fin_wait_1

	cmp	eax, TCB_ESTABLISHED

	je	.fin_wait_1

	; assume CLOSE WAIT

	; Send a fin, then enter last-ack state

	mov	[ebx + SOCKET.TCBState], TCB_LAST_ACK

	jmp	.send

  .fin_wait_1:

	; Send a fin, then enter finwait2 state

	mov	[ebx + SOCKET.TCBState], TCB_FIN_WAIT_1

  .send:

	mov	eax, NET1OUT_QUEUE

	mov	edx, [IP_LIST]

;        mov     ecx, [sockAddr]

	cmp	edx, [ecx + SOCKET.RemoteIP]

	jne	.not_local

	mov	eax, IPIN_QUEUE

  .not_local:

	; Send it.

	pop	ebx

	call	queue

	jmp	.exit

  .destroy_tcb:

	stdcall net_socket_free, eax

end if

  .exit:

	mov	dword [esp+32],0

	ret

;-----------------------------------------------

;

; SOCKET_receive

;

;

;  IN:  socket number in ecx

;       addr in edx

;       addrlen in esi

;       flags in edi

;  OUT: eax is number of bytes copied, -1 on error

;

;-----------------------------------------------

socket_recv:

	DEBUGF	1,"Socket_receive: socknum: %u sockaddr: %x, length: %u, flags: %x\n",ecx,edx,esi,edi

	stdcall net_socket_num_to_addr, ecx		   ; get real socket address

	or	eax, eax

	jz	s_error

	DEBUGF 1,"real socket address:%x\n", eax

	mov	dword[esp+32], -1

	mov	edi, edx

	lea	ebx, [eax + SOCKET.lock]

	call	wait_mutex

	mov	ecx, [eax + SOCKET.rxDataCount] 	   ; get count of bytes

	DEBUGF 1,"bytes in socket:%u\n", ecx

	test	ecx, ecx				   ; if count of bytes is zero..

	jz	.exit					   ; exit function (eax will be zero)

	cmp	ecx, esi				   ; if buffer size is larger then the bytes of data, copy all data

	jle	.copy_all_bytes

	sub	ecx, esi				   ; store new count (data bytes in buffer - bytes we're about to copy)

	mov	[eax + SOCKET.rxDataCount], ecx 	   ;

	push	ecx

	mov	edx, esi

	call	.start_copy				   ; copy to the application

	mov	dword[esp+32], edx

	lea	edi, [eax + SOCKET.rxData]		   ; Now shift the remaining bytes to start of buffer

	lea	esi, [edi + edx]

	mov	ecx, [esp]

	shr	ecx, 2					   ; divide eax by 4

	rep	movsd					   ; copy all full dwords

	pop	ecx

	and	ecx, 3

	rep	movsb					   ; copy remaining bytes

  .exit:

	mov	[eax + SOCKET.lock], 0

	ret

  .copy_all_bytes:

	mov	dword[esp+32], ecx

	mov	[eax + SOCKET.rxDataCount], 0		  ; store new count (zero)

	push	dword .exit				   ; this code results in same as commented out code

  .start_copy:

	DEBUGF	1,"copying %u bytes\n",ecx

	lea	esi, [eax + SOCKET.rxData]

	push	ecx

	shr	ecx, 2					   ; divide eax by 4

	rep	movsd

	pop	ecx

	and	ecx, 3

	rep	movsb					   ; copy the rest bytes

	ret						   ; exit, or go back to shift remaining bytes if any

;-----------------------------------------------

;

; SOCKET_send

;

;

;  IN:  socket number in ecx

;       addr in edx

;       addrlen in esi

;       flags in edi

;  OUT: -1 on error

;

;-----------------------------------------------

socket_send:

	DEBUGF	1,"Socket_send: socknum: %u sockaddr: %x, length: %u, flags: %x, ",ecx,edx,esi,edi

	stdcall net_socket_num_to_addr, ecx		   ; get real socket address

	or	eax, eax

	jz	s_error

	DEBUGF	1,"Socket type:%u\n", [eax + SOCKET.Type]:4

	cmp	[eax + SOCKET.Type], IP_PROTO_UDP

	je	.udp

	cmp	[eax + SOCKET.Type], IP_PROTO_ICMP

	je	.icmp

;        cmp     [eax + SOCKET.Type], IP_PROTO_TCP

;        je      .tcp

	jmp	s_error

  .udp:

	DEBUGF	1,"type: UDP\n"

	mov	ecx, esi

	mov	esi, edx

	mov	edx, dword [eax + SOCKET.LocalPort] ; load local port and remote port at once

	DEBUGF	1,"local port: %u, remote port:%u\n",[eax + SOCKET.LocalPort]:2, [eax + SOCKET.RemotePort]:2

	bswap	edx	 ;;;

	rol	edx, 16  ;;;

	mov	ebx, [eax + SOCKET.LocalIP]

	mov	eax, [eax + SOCKET.RemoteIP]

	call	UDP_create_packet

	mov	[esp+32], eax

	ret

  .icmp:

	; note: for ICMP sockets the SOCKET.LocalPort is used as the 'Identifier' value for ICMP packets

	; the application must add the header to the data, the kernel will fill in 'identifier' and 'checksum'

	sub	ecx, ICMP_Packet.Data

	mov	esi, edx

	push	ax

	call	IPv4_get_frgmnt_num

	mov	dx, ax

	pop	ax

	shl	edx, 16

	mov	dh , [esi + ICMP_Packet.Type]

	mov	dl , [esi + ICMP_Packet.Code]

	mov	di , [esi + ICMP_Packet.Identifier]

;        mov     [eax + SOCKET.LocalPort], di            ; Set localport to the identifier number, so we can receive reply's

	shl	edi, 16

	mov	di , [esi + ICMP_Packet.SequenceNumber]

	add	esi, ICMP_Packet.Data

	mov	ebx, [eax + SOCKET.LocalIP]

	mov	eax, [eax + SOCKET.RemoteIP]

	call	ICMP_create_packet

	mov	[esp+32], eax

	ret

  .tcp:

	ret

; Allocate memory for socket data and put new socket into the list

; Newly created socket is initialized with calling PID and number and

; put into beginning of list (which is a fastest way).

;

; @return socket structure address in EAX

;

proc net_socket_alloc stdcall uses ebx ecx edx edi

	stdcall kernel_alloc, SOCKETBUFFSIZE

	DEBUGF	1, "K : net_socket_alloc (0x%x)\n", eax

	; check if we can allocate needed amount of memory

	or	eax, eax

	jz	.exit

	; zero-initialize allocated memory

	push	eax

	mov	edi, eax

	mov	ecx, SOCKETBUFFSIZE / 4

;        cld

	xor	eax, eax

	rep	stosd

	pop	eax

	; add socket to the list by changing pointers

	mov	ebx, net_sockets

	push	[ebx + SOCKET.NextPtr]

	mov	[ebx + SOCKET.NextPtr], eax

	mov	[eax + SOCKET.PrevPtr], ebx

	pop	ebx

	mov	[eax + SOCKET.NextPtr], ebx

	or	ebx, ebx

	jz	@f

	mov	[ebx + SOCKET.PrevPtr], eax

    @@: ; set socket owner PID to the one of calling process

	mov	ebx, [TASK_BASE]

	mov	ebx, [ebx + TASKDATA.pid]

	mov	[eax + SOCKET.PID], ebx

	; find first free socket number and use it

	;mov     edx, ebx

	mov	ebx, net_sockets

	xor	ecx, ecx

  .next_socket_number:

	inc	ecx

  .next_socket:

	mov	ebx, [ebx + SOCKET.NextPtr]

	or	ebx, ebx

	jz	.last_socket_number

	cmp	[ebx + SOCKET.Number], ecx

	jne	.next_socket

	;cmp     [ebx + SOCKET.PID], edx

	;jne     .next_socket

	mov	ebx, net_sockets

	jmp	.next_socket_number

  .last_socket_number:

	mov	[eax + SOCKET.Number], ecx

  .exit:

	ret

endp

; Free socket data memory and pop socket off the list

;

; @param sockAddr is a socket structure address

;

proc net_socket_free stdcall uses ebx ecx edx, sockAddr:DWORD

	mov	eax, [sockAddr]

	DEBUGF	1, "K : net_socket_free (0x%x)\n", eax

	; check if we got something similar to socket structure address

	or	eax, eax

	jz	.error

	; make sure sockAddr is one of the socket addresses in the list

	mov	ebx, net_sockets

	;mov     ecx, [TASK_BASE]

	;mov     ecx, [ecx + TASKDATA.pid]

  .next_socket:

	mov	ebx, [ebx + SOCKET.NextPtr]

	or	ebx, ebx

	jz	.error

	cmp	ebx, eax

	jne	.next_socket

	;cmp     [ebx + SOCKET.PID], ecx

	;jne     .next_socket

	; okay, we found the correct one

	; remove it from the list first, changing pointers

	mov	ebx, [eax + SOCKET.NextPtr]

	mov	eax, [eax + SOCKET.PrevPtr]

	mov	[eax + SOCKET.NextPtr], ebx

	or	ebx, ebx

	jz	@f

	mov	[ebx + SOCKET.PrevPtr], eax

    @@: ; and finally free the memory structure used

	stdcall kernel_free, [sockAddr]

	ret

  .error:

	DEBUGF	1, "K :   failed\n"

	ret

endp

; Get socket structure address by its number

; Scan through sockets list to find the socket with specified number.

; This proc uses SOCKET.PID indirectly to check if socket is owned by

; calling process.

;

; @param sockNum is a socket number

; @return socket structure address or 0 (not found) in EAX

;

proc net_socket_num_to_addr stdcall uses ebx ecx, sockNum:DWORD

	mov	eax, [sockNum]

	; check if we got something similar to socket number

	or	eax, eax

	jz	.error

	; scan through sockets list

	mov	ebx, net_sockets

	;mov     ecx, [TASK_BASE]

	;mov     ecx, [ecx + TASKDATA.pid]

  .next_socket:

	mov	ebx, [ebx + SOCKET.NextPtr]

	or	ebx, ebx

	jz	.error

	cmp	[ebx + SOCKET.Number], eax

	jne	.next_socket

	;cmp     [ebx + SOCKET.PID], ecx

	;jne     .next_socket

	; okay, we found the correct one

	mov	eax, ebx

	ret

  .error:

	xor	eax, eax

	ret

endp

; Get socket number by its structure address

; Scan through sockets list to find the socket with specified address.

; This proc uses SOCKET.PID indirectly to check if socket is owned by

; calling process.

;

; @param sockAddr is a socket structure address

; @return socket number (SOCKET.Number) or 0 (not found) in EAX

;

proc net_socket_addr_to_num stdcall uses ebx ecx, sockAddr:DWORD

	mov	eax, [sockAddr]

	; check if we got something similar to socket structure address

	or	eax, eax

	jz	.error

	; scan through sockets list

	mov	ebx, net_sockets

	;mov     ecx, [TASK_BASE]

	;mov     ecx, [ecx + TASKDATA.pid]

  .next_socket:

	mov	ebx, [ebx + SOCKET.NextPtr]

	or	ebx, ebx

	jz	.error

	cmp	ebx, eax

	jne	.next_socket

	;cmp     [ebx + SOCKET.PID], ecx

	;jne     .next_socket

	; okay, we found the correct one

	mov	eax, [ebx + SOCKET.Number]

	ret

  .error:

	xor	eax, eax

	ret

endp