"""
A simple libpcap injector
"""

# 	Copyright (c) 2008 Peter V. Saveliev
#
# 	This file is part of Connexion project.
#
# 	Connexion is free software; you can redistribute it and/or modify
# 	it under the terms of the GNU General Public License as published by
# 	the Free Software Foundation; either version 3 of the License, or
# 	(at your option) any later version.
#
# 	Connexion is distributed in the hope that it will be useful,
# 	but WITHOUT ANY WARRANTY; without even the implied warranty of
# 	MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
# 	GNU General Public License for more details.
#
# 	You should have received a copy of the GNU General Public License
# 	along with Connexion; if not, write to the Free Software
# 	Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA

__all__ = ["pcap_interface"]

from ctypes import *

PCAP_ERRBUF_SIZE = 256

libp = CDLL("libpcap.so.0.8")

class pcap_interface(object):

	error = None
	psock = None

	def __init__(self,name):
		self.error = create_string_buffer(PCAP_ERRBUF_SIZE)
		self.psock = libp.pcap_open_live(name,65535,0,1,byref(self.error))

	def inject(self,packet):
		return libp.pcap_inject(self.psock,byref(packet),sizeof(packet))

	def perror(self):
		print string_at(addressof(self.error))

	def close(self):
		libp.pcap_close(self.psock)