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pcap.h
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pcap.h [plain text]
/* -*- Mode: c; tab-width: 8; indent-tabs-mode: 1; c-basic-offset: 8; -*- */
/*
* Copyright (c) 1993, 1994, 1995, 1996, 1997
* The Regents of the University of California. All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. All advertising materials mentioning features or use of this software
* must display the following acknowledgement:
* This product includes software developed by the Computer Systems
* Engineering Group at Lawrence Berkeley Laboratory.
* 4. Neither the name of the University nor of the Laboratory may be used
* to endorse or promote products derived from this software without
* specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*
* @(#) $Header: /tcpdump/master/libpcap/pcap.h,v 1.52.2.6 2006/02/09 22:26:49 guy Exp $ (LBL)
*/
#ifndef lib_pcap_h
#define lib_pcap_h
#if defined(WIN32)
#include <pcap-stdinc.h>
#elif defined(MSDOS)
#include <sys/types.h>
#include <sys/socket.h> /* u_int, u_char etc. */
#else /* UN*X */
#include <sys/types.h>
#include <sys/time.h>
#endif /* WIN32/MSDOS/UN*X */
#ifndef PCAP_DONT_INCLUDE_PCAP_BPF_H
#include <pcap-bpf.h>
#endif
#include <stdio.h>
#ifdef __cplusplus
extern "C" {
#endif
#define PCAP_VERSION_MAJOR 2
#define PCAP_VERSION_MINOR 4
#define PCAP_ERRBUF_SIZE 256
/*
* Compatibility for systems that have a bpf.h that
* predates the bpf typedefs for 64-bit support.
*/
#if BPF_RELEASE - 0 < 199406
typedef int bpf_int32;
typedef u_int bpf_u_int32;
#endif
typedef struct pcap pcap_t;
typedef struct pcap_dumper pcap_dumper_t;
typedef struct pcap_if pcap_if_t;
typedef struct pcap_addr pcap_addr_t;
/*
* The first record in the file contains saved values for some
* of the flags used in the printout phases of tcpdump.
* Many fields here are 32 bit ints so compilers won't insert unwanted
* padding; these files need to be interchangeable across architectures.
*
* Do not change the layout of this structure, in any way (this includes
* changes that only affect the length of fields in this structure).
*
* Also, do not change the interpretation of any of the members of this
* structure, in any way (this includes using values other than
* LINKTYPE_ values, as defined in "savefile.c", in the "linktype"
* field).
*
* Instead:
*
* introduce a new structure for the new format, if the layout
* of the structure changed;
*
* send mail to "tcpdump-workers@tcpdump.org", requesting a new
* magic number for your new capture file format, and, when
* you get the new magic number, put it in "savefile.c";
*
* use that magic number for save files with the changed file
* header;
*
* make the code in "savefile.c" capable of reading files with
* the old file header as well as files with the new file header
* (using the magic number to determine the header format).
*
* Then supply the changes to "patches@tcpdump.org", so that future
* versions of libpcap and programs that use it (such as tcpdump) will
* be able to read your new capture file format.
*/
struct pcap_file_header {
bpf_u_int32 magic;
u_short version_major;
u_short version_minor;
bpf_int32 thiszone; /* gmt to local correction */
bpf_u_int32 sigfigs; /* accuracy of timestamps */
bpf_u_int32 snaplen; /* max length saved portion of each pkt */
bpf_u_int32 linktype; /* data link type (LINKTYPE_*) */
};
typedef enum {
PCAP_D_INOUT = 0,
PCAP_D_IN,
PCAP_D_OUT
} pcap_direction_t;
/*
* Generic per-packet information, as supplied by libpcap.
*
* The time stamp can and should be a "struct timeval", regardless of
* whether your system supports 32-bit tv_sec in "struct timeval",
* 64-bit tv_sec in "struct timeval", or both if it supports both 32-bit
* and 64-bit applications. The on-disk format of savefiles uses 32-bit
* tv_sec (and tv_usec); this structure is irrelevant to that. 32-bit
* and 64-bit versions of libpcap, even if they're on the same platform,
* should supply the appropriate version of "struct timeval", even if
* that's not what the underlying packet capture mechanism supplies.
*/
struct pcap_pkthdr {
struct timeval ts; /* time stamp */
bpf_u_int32 caplen; /* length of portion present */
bpf_u_int32 len; /* length this packet (off wire) */
};
/*
* As returned by the pcap_stats()
*/
struct pcap_stat {
u_int ps_recv; /* number of packets received */
u_int ps_drop; /* number of packets dropped */
u_int ps_ifdrop; /* drops by interface XXX not yet supported */
#ifdef WIN32
u_int bs_capt; /* number of packets that reach the application */
#endif /* WIN32 */
};
#ifdef MSDOS
/*
* As returned by the pcap_stats_ex()
*/
struct pcap_stat_ex {
u_long rx_packets; /* total packets received */
u_long tx_packets; /* total packets transmitted */
u_long rx_bytes; /* total bytes received */
u_long tx_bytes; /* total bytes transmitted */
u_long rx_errors; /* bad packets received */
u_long tx_errors; /* packet transmit problems */
u_long rx_dropped; /* no space in Rx buffers */
u_long tx_dropped; /* no space available for Tx */
u_long multicast; /* multicast packets received */
u_long collisions;
/* detailed rx_errors: */
u_long rx_length_errors;
u_long rx_over_errors; /* receiver ring buff overflow */
u_long rx_crc_errors; /* recv'd pkt with crc error */
u_long rx_frame_errors; /* recv'd frame alignment error */
u_long rx_fifo_errors; /* recv'r fifo overrun */
u_long rx_missed_errors; /* recv'r missed packet */
/* detailed tx_errors */
u_long tx_aborted_errors;
u_long tx_carrier_errors;
u_long tx_fifo_errors;
u_long tx_heartbeat_errors;
u_long tx_window_errors;
};
#endif
/*
* Item in a list of interfaces.
*/
struct pcap_if {
struct pcap_if *next;
char *name; /* name to hand to "pcap_open_live()" */
char *description; /* textual description of interface, or NULL */
struct pcap_addr *addresses;
bpf_u_int32 flags; /* PCAP_IF_ interface flags */
};
#define PCAP_IF_LOOPBACK 0x00000001 /* interface is loopback */
/*
* Representation of an interface address.
*/
struct pcap_addr {
struct pcap_addr *next;
struct sockaddr *addr; /* address */
struct sockaddr *netmask; /* netmask for that address */
struct sockaddr *broadaddr; /* broadcast address for that address */
struct sockaddr *dstaddr; /* P2P destination address for that address */
};
typedef void (*pcap_handler)(u_char *, const struct pcap_pkthdr *,
const u_char *);
char *pcap_lookupdev(char *);
int pcap_lookupnet(const char *, bpf_u_int32 *, bpf_u_int32 *, char *);
pcap_t *pcap_open_live(const char *, int, int, int, char *);
pcap_t *pcap_open_dead(int, int);
pcap_t *pcap_open_offline(const char *, char *);
pcap_t *pcap_fopen_offline(FILE *, char *);
void pcap_close(pcap_t *);
int pcap_loop(pcap_t *, int, pcap_handler, u_char *);
int pcap_dispatch(pcap_t *, int, pcap_handler, u_char *);
const u_char*
pcap_next(pcap_t *, struct pcap_pkthdr *);
int pcap_next_ex(pcap_t *, struct pcap_pkthdr **, const u_char **);
void pcap_breakloop(pcap_t *);
int pcap_stats(pcap_t *, struct pcap_stat *);
int pcap_setfilter(pcap_t *, struct bpf_program *);
int pcap_setdirection(pcap_t *, pcap_direction_t);
int pcap_getnonblock(pcap_t *, char *);
int pcap_setnonblock(pcap_t *, int, char *);
void pcap_perror(pcap_t *, char *);
int pcap_inject(pcap_t *, const void *, size_t);
int pcap_sendpacket(pcap_t *, const u_char *, int);
char *pcap_strerror(int);
char *pcap_geterr(pcap_t *);
int pcap_compile(pcap_t *, struct bpf_program *, char *, int,
bpf_u_int32);
int pcap_compile_nopcap(int, int, struct bpf_program *,
char *, int, bpf_u_int32);
void pcap_freecode(struct bpf_program *);
int pcap_datalink(pcap_t *);
int pcap_list_datalinks(pcap_t *, int **);
int pcap_set_datalink(pcap_t *, int);
int pcap_datalink_name_to_val(const char *);
const char *pcap_datalink_val_to_name(int);
const char *pcap_datalink_val_to_description(int);
int pcap_snapshot(pcap_t *);
int pcap_is_swapped(pcap_t *);
int pcap_major_version(pcap_t *);
int pcap_minor_version(pcap_t *);
/* XXX */
FILE *pcap_file(pcap_t *);
int pcap_fileno(pcap_t *);
pcap_dumper_t *pcap_dump_open(pcap_t *, const char *);
pcap_dumper_t *pcap_dump_fopen(pcap_t *, FILE *fp);
FILE *pcap_dump_file(pcap_dumper_t *);
long pcap_dump_ftell(pcap_dumper_t *);
int pcap_dump_flush(pcap_dumper_t *);
void pcap_dump_close(pcap_dumper_t *);
void pcap_dump(u_char *, const struct pcap_pkthdr *, const u_char *);
int pcap_findalldevs(pcap_if_t **, char *);
void pcap_freealldevs(pcap_if_t *);
const char *pcap_lib_version(void);
/* XXX this guy lives in the bpf tree */
u_int bpf_filter(struct bpf_insn *, u_char *, u_int, u_int);
int bpf_validate(struct bpf_insn *f, int len);
char *bpf_image(struct bpf_insn *, int);
void bpf_dump(struct bpf_program *, int);
#if defined(WIN32)
/*
* Win32 definitions
*/
int pcap_setbuff(pcap_t *p, int dim);
int pcap_setmode(pcap_t *p, int mode);
int pcap_setmintocopy(pcap_t *p, int size);
#ifdef WPCAP
/* Include file with the wpcap-specific extensions */
#include <Win32-Extensions.h>
#endif /* WPCAP */
#define MODE_CAPT 0
#define MODE_STAT 1
#define MODE_MON 2
#elif defined(MSDOS)
/*
* MS-DOS definitions
*/
int pcap_stats_ex (pcap_t *, struct pcap_stat_ex *);
void pcap_set_wait (pcap_t *p, void (*yield)(void), int wait);
u_long pcap_mac_packets (void);
#else /* UN*X */
/*
* UN*X definitions
*/
int pcap_get_selectable_fd(pcap_t *);
#endif /* WIN32/MSDOS/UN*X */
#ifdef __cplusplus
}
#endif
#endif