Re: Port binding under linux in ASM

On Sat, 19 Apr 2008 11:01:19 -0700 (PDT)
tin.cans.and.string@xxxxxxxxx wrote:

I am having the *damndest* time finding asm-oriented documentation on
linux syscalls in general, but port binding in particular.

For everything but port binding, you can download a demonstration
graphics game from my web site. For port binding in particular, here is
a working snippet:

syscall equ int 80h

;initialize listening fd
;create socket descriptor
mov [p0],PF_INET
mov [p1],SOCK_STREAM
mov [p2],0
mov eax,__NR_socketcall
mov ebx,SYS_SOCKET
mov ecx,sparms
syscall
mov [fd],eax ;socket file descriptor
or eax,eax ;test return code
jns ibind ;ok
err 302
;bind to port
ibind: mov ecx,[fd] ;socket file descriptor
mov [p0],ecx ;socket file descriptor
mov [p1],sin ;socket address structure
mov [p2],sinl ;length of structure
mov eax,__NR_socketcall
mov ebx,SYS_BIND
mov ecx,sparms
syscall
or eax,eax ;test return code
jns ilistn ;ok
err 303
;listen for connections
ilistn: mov ecx,[fd] ;socket file descriptor
mov [p0],ecx ;socket file descriptor
mov [p1],5 ;max queue length
mov eax,__NR_socketcall
mov ebx,SYS_LISTEN
mov ecx,sparms
syscall
or eax,eax ;test return code
jns tstwrm ;ok
err 304


--
Chuck
http://www.pacificsites.com/~ccrayne/charles.html


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