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connect.asm
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connect.asm
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<% from pwnlib.shellcraft.i386 import pushstr %>
<% from pwnlib.shellcraft.i386.linux import socket, socketcall %>
<% from pwnlib.constants import SYS_socketcall_connect %>
<% from pwnlib.util.net import sockaddr %>
<%page args="host, port, network = 'ipv4'"/>
<%docstring>
Connects to the host on the specified port.
Leaves the connected socket in edx
Arguments:
host(str): Remote IP address or hostname (as a dotted quad / string)
port(int): Remote port
network(str): Network protocol (ipv4 or ipv6)
Examples:
>>> l = listen(timeout=5)
>>> assembly = shellcraft.i386.linux.connect('localhost', l.lport)
>>> assembly += shellcraft.i386.pushstr('Hello')
>>> assembly += shellcraft.i386.linux.write('edx', 'esp', 5)
>>> p = run_assembly(assembly)
>>> l.wait_for_connection().recv()
'Hello'
>>> l = listen(fam='ipv6', timeout=5)
>>> assembly = shellcraft.i386.linux.connect('::1', l.lport, 'ipv6')
>>> p = run_assembly(assembly)
>>> assert l.wait_for_connection()
</%docstring>
<%
sockaddr, length, address_family = sockaddr(host, port, network)
%>\
/* open new socket, save it */
${socket(network)}
mov edx, eax
/* push sockaddr, connect() */
${pushstr(sockaddr, False)}
mov ecx, esp
${socketcall(SYS_socketcall_connect, 'edx', 'ecx', length)}
/* Socket that is maybe connected is in edx */