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Diffstat (limited to '')
| -rw-r--r-- | src/include/pcap.h | 101 |
1 files changed, 101 insertions, 0 deletions
diff --git a/src/include/pcap.h b/src/include/pcap.h new file mode 100644 index 0000000..1d57d93 --- /dev/null +++ b/src/include/pcap.h @@ -0,0 +1,101 @@ +#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 |