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/*
* Copyright 2013 Google Inc.
*
* This program 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 2
* of the License, or (at your option) any later version.
*
* This program 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 this program; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
* 02110-1301, USA.
*/
/*
* Author: ncardwell@google.com (Neal Cardwell)
*
* Platform-independent API to read and write raw packets.
*
* We allocate and configure things much like tcpdump. We do this so
* we can get timestamps on the outbound packets the kernel sends, to
* verify the correct timing (tun devices do not take timestamps).
*/
#ifndef __PACKET_SOCKET_H__
#define __PACKET_SOCKET_H__
#include "types.h"
#include "ethernet.h"
#include "ip_address.h"
#include "packet.h"
struct packet_socket;
/* Allocate and initialize a packet socket. */
extern struct packet_socket *packet_socket_new(const char *device_name);
/* Free all the memory used by the packet socket. */
extern void packet_socket_free(struct packet_socket *packet_socket);
/* Add a filter so we only sniff packets we want. */
extern void packet_socket_set_filter(
struct packet_socket *psock,
const struct ether_addr *client_ether_addr,
const struct ip_address *client_live_ip);
/* Send the given packet using writev. Return STATUS_OK on success,
* or STATUS_ERR if writev returns an error.
*/
extern int packet_socket_writev(struct packet_socket *psock,
const struct iovec *iov, int iovcnt);
/* Do a blocking sniff of the next packet going over the given device
* in the given direction, fill in the given packet with the sniffed
* packet info, and return the number of bytes in the packet in
* *in_bytes. If we successfully read a matching packet, return
* STATUS_OK; else return STATUS_ERR (in which case the caller can
* retry).
*/
extern int packet_socket_receive(struct packet_socket *psock,
enum direction_t direction,
struct packet *packet, int *in_bytes);
#endif /* __PACKET_SOCKET_H__ */
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