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#ifndef FR_PCAP_H
#define FR_PCAP_H
#ifdef HAVE_LIBPCAP
/*
* This program is is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License, version 2 of the
* License as published by the Free Software Foundation.
*
* 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 St, Fifth Floor, Boston, MA 02110-1301, USA
*/
/**
* $Id$
* @file include/pcap.h
* @brief Prototypes and constants for PCAP functions.
*
* @author Arran Cudbard-Bell <a.cudbardb@freeradius.org>
* @copyright 2013 Arran Cudbard-Bell <a.cudbardb@freeradius.org>
*/
#include <freeradius-devel/libradius.h>
#include <freeradius-devel/net.h>
#include <sys/types.h>
#include <pcap.h>
#define SNAPLEN ETHER_HDR_LEN + IP_HDR_LEN + sizeof(struct udp_header) + MAX_RADIUS_LEN
#define PCAP_BUFFER_DEFAULT (10000)
/*
* It's unclear why this differs between platforms
*/
#ifndef __linux__
# define PCAP_NONBLOCK_TIMEOUT (0)
#else
# define PCAP_NONBLOCK_TIMEOUT (-1)
#endif
#ifndef BIOCIMMEDIATE
# define BIOCIMMEDIATE (2147762800)
#endif
/*
* Older versions of libpcap don't define this
*/
#ifndef PCAP_NETMASK_UNKNOWN
# define PCAP_NETMASK_UNKNOWN 0
#endif
typedef enum {
PCAP_INVALID = 0,
PCAP_INTERFACE_IN,
PCAP_FILE_IN,
PCAP_STDIO_IN,
PCAP_INTERFACE_OUT,
PCAP_FILE_OUT,
PCAP_STDIO_OUT
} fr_pcap_type_t;
extern const FR_NAME_NUMBER pcap_types[];
/*
* Internal pcap structures
*/
typedef struct fr_pcap fr_pcap_t;
struct fr_pcap {
char errbuf[PCAP_ERRBUF_SIZE]; //!< Last error on this interface.
fr_pcap_type_t type; //!< What type of handle this is.
char *name; //!< Name of file or interface.
bool promiscuous; //!< Whether the interface is in promiscuous mode.
//!< Only valid for live capture handles.
int buffer_pkts; //!< How big to make the PCAP ring buffer.
//!< Actual buffer size is SNAPLEN * buffer.
//!< Only valid for live capture handles.
pcap_t *handle; //!< libpcap handle.
pcap_dumper_t *dumper; //!< libpcap dumper handle.
int link_layer; //!< Link layer type.
int fd; //!< Selectable file descriptor we feed to select.
struct pcap_stat pstats; //!< The last set of pcap stats for this handle.
fr_pcap_t *next; //!< Next handle in collection.
};
int fr_pcap_if_link_layer(char *errbuff, pcap_if_t *dev);
fr_pcap_t *fr_pcap_init(TALLOC_CTX *ctx, char const *name, fr_pcap_type_t type);
int fr_pcap_open(fr_pcap_t *handle);
int fr_pcap_apply_filter(fr_pcap_t *handle, char const *expression);
char *fr_pcap_device_names(TALLOC_CTX *ctx, fr_pcap_t *handle, char c);
bool fr_pcap_link_layer_supported(int link_layer);
ssize_t fr_pcap_link_layer_offset(uint8_t const *data, size_t len, int link_layer);
#endif
#endif
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