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/* -*- 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/pcap.h,v 1.15 2008-10-06 15:27:32 gianluca Exp $ (LBL) */ #ifndef lib_pcap_pcap_h #define lib_pcap_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 /* * Version number of the current version of the pcap file format. * * NOTE: this is *NOT* the version number of the libpcap library. * To fetch the version information for the version of libpcap * you're using, use pcap_lib_version(). */ #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@lists.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 by forking the branch at * * https://github.com/the-tcpdump-group/libpcap/issues * * and issuing a pull request, 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_*) */ }; /* * Macros for the value returned by pcap_datalink_ext(). * * If LT_FCS_LENGTH_PRESENT(x) is true, the LT_FCS_LENGTH(x) macro * gives the FCS length of packets in the capture. */ #define LT_FCS_LENGTH_PRESENT(x) ((x) & 0x04000000) #define LT_FCS_LENGTH(x) (((x) & 0xF0000000) >> 28) #define LT_FCS_DATALINK_EXT(x) ((((x) & 0xF) << 28) | 0x04000000) 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 -- only supported on some platforms */ #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 *); /* * Error codes for the pcap API. * These will all be negative, so you can check for the success or * failure of a call that returns these codes by checking for a * negative value. */ #define PCAP_ERROR -1 /* generic error code */ #define PCAP_ERROR_BREAK -2 /* loop terminated by pcap_breakloop */ #define PCAP_ERROR_NOT_ACTIVATED -3 /* the capture needs to be activated */ #define PCAP_ERROR_ACTIVATED -4 /* the operation can't be performed on already activated captures */ #define PCAP_ERROR_NO_SUCH_DEVICE -5 /* no such device exists */ #define PCAP_ERROR_RFMON_NOTSUP -6 /* this device doesn't support rfmon (monitor) mode */ #define PCAP_ERROR_NOT_RFMON -7 /* operation supported only in monitor mode */ #define PCAP_ERROR_PERM_DENIED -8 /* no permission to open the device */ #define PCAP_ERROR_IFACE_NOT_UP -9 /* interface isn't up */ #define PCAP_ERROR_CANTSET_TSTAMP_TYPE -10 /* this device doesn't support setting the time stamp type */ #define PCAP_ERROR_PROMISC_PERM_DENIED -11 /* you don't have permission to capture in promiscuous mode */ #define PCAP_ERROR_TSTAMP_PRECISION_NOTSUP -12 /* the requested time stamp precision is not supported */ /* * Warning codes for the pcap API. * These will all be positive and non-zero, so they won't look like * errors. */ #define PCAP_WARNING 1 /* generic warning code */ #define PCAP_WARNING_PROMISC_NOTSUP 2 /* this device doesn't support promiscuous mode */ #define PCAP_WARNING_TSTAMP_TYPE_NOTSUP 3 /* the requested time stamp type is not supported */ /* * Value to pass to pcap_compile() as the netmask if you don't know what * the netmask is. */ #define PCAP_NETMASK_UNKNOWN 0xffffffff char *pcap_lookupdev(char *); int pcap_lookupnet(const char *, bpf_u_int32 *, bpf_u_int32 *, char *); pcap_t *pcap_create(const char *, char *); int pcap_set_snaplen(pcap_t *, int); int pcap_set_promisc(pcap_t *, int); int pcap_can_set_rfmon(pcap_t *); int pcap_set_rfmon(pcap_t *, int); int pcap_set_timeout(pcap_t *, int); int pcap_set_tstamp_type(pcap_t *, int); int pcap_set_immediate_mode(pcap_t *, int); int pcap_set_buffer_size(pcap_t *, int); int pcap_set_tstamp_precision(pcap_t *, int); int pcap_get_tstamp_precision(pcap_t *); int pcap_activate(pcap_t *); int pcap_list_tstamp_types(pcap_t *, int **); void pcap_free_tstamp_types(int *); int pcap_tstamp_type_name_to_val(const char *); const char *pcap_tstamp_type_val_to_name(int); const char *pcap_tstamp_type_val_to_description(int); /* * Time stamp types. * Not all systems and interfaces will necessarily support all of these. * * A system that supports PCAP_TSTAMP_HOST is offering time stamps * provided by the host machine, rather than by the capture device, * but not committing to any characteristics of the time stamp; * it will not offer any of the PCAP_TSTAMP_HOST_ subtypes. * * PCAP_TSTAMP_HOST_LOWPREC is a time stamp, provided by the host machine, * that's low-precision but relatively cheap to fetch; it's normally done * using the system clock, so it's normally synchronized with times you'd * fetch from system calls. * * PCAP_TSTAMP_HOST_HIPREC is a time stamp, provided by the host machine, * that's high-precision; it might be more expensive to fetch. It might * or might not be synchronized with the system clock, and might have * problems with time stamps for packets received on different CPUs, * depending on the platform. * * PCAP_TSTAMP_ADAPTER is a high-precision time stamp supplied by the * capture device; it's synchronized with the system clock. * * PCAP_TSTAMP_ADAPTER_UNSYNCED is a high-precision time stamp supplied by * the capture device; it's not synchronized with the system clock. * * Note that time stamps synchronized with the system clock can go * backwards, as the system clock can go backwards. If a clock is * not in sync with the system clock, that could be because the * system clock isn't keeping accurate time, because the other * clock isn't keeping accurate time, or both. * * Note that host-provided time stamps generally correspond to the * time when the time-stamping code sees the packet; this could * be some unknown amount of time after the first or last bit of * the packet is received by the network adapter, due to batching * of interrupts for packet arrival, queueing delays, etc.. */ #define PCAP_TSTAMP_HOST 0 /* host-provided, unknown characteristics */ #define PCAP_TSTAMP_HOST_LOWPREC 1 /* host-provided, low precision */ #define PCAP_TSTAMP_HOST_HIPREC 2 /* host-provided, high precision */ #define PCAP_TSTAMP_ADAPTER 3 /* device-provided, synced with the system clock */ #define PCAP_TSTAMP_ADAPTER_UNSYNCED 4 /* device-provided, not synced with the system clock */ /* * Time stamp resolution types. * Not all systems and interfaces will necessarily support all of these * resolutions when doing live captures; all of them can be requested * when reading a savefile. */ #define PCAP_TSTAMP_PRECISION_MICRO 0 /* use timestamps with microsecond precision, default */ #define PCAP_TSTAMP_PRECISION_NANO 1 /* use timestamps with nanosecond precision */ pcap_t *pcap_open_live(const char *, int, int, int, char *); pcap_t *pcap_open_dead(int, int); pcap_t *pcap_open_dead_with_tstamp_precision(int, int, u_int); pcap_t *pcap_open_offline_with_tstamp_precision(const char *, u_int, char *); pcap_t *pcap_open_offline(const char *, char *); #if defined(WIN32) pcap_t *pcap_hopen_offline_with_tstamp_precision(intptr_t, u_int, char *); pcap_t *pcap_hopen_offline(intptr_t, char *); #if !defined(LIBPCAP_EXPORTS) #define pcap_fopen_offline_with_tstamp_precision(f,p,b) \ pcap_hopen_offline_with_tstamp_precision(_get_osfhandle(_fileno(f)), p, b) #define pcap_fopen_offline(f,b) \ pcap_hopen_offline(_get_osfhandle(_fileno(f)), b) #else /*LIBPCAP_EXPORTS*/ static pcap_t *pcap_fopen_offline_with_tstamp_precision(FILE *, u_int, char *); static pcap_t *pcap_fopen_offline(FILE *, char *); #endif #else /*WIN32*/ pcap_t *pcap_fopen_offline_with_tstamp_precision(FILE *, u_int, char *); pcap_t *pcap_fopen_offline(FILE *, char *); #endif /*WIN32*/ 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 *); int pcap_inject(pcap_t *, const void *, size_t); int pcap_sendpacket(pcap_t *, const u_char *, int); const char *pcap_statustostr(int); const char *pcap_strerror(int); char *pcap_geterr(pcap_t *); void pcap_perror(pcap_t *, char *); int pcap_compile(pcap_t *, struct bpf_program *, const char *, int, bpf_u_int32); int pcap_compile_nopcap(int, int, struct bpf_program *, const char *, int, bpf_u_int32); void pcap_freecode(struct bpf_program *); int pcap_offline_filter(const struct bpf_program *, const struct pcap_pkthdr *, const u_char *); int pcap_datalink(pcap_t *); int pcap_datalink_ext(pcap_t *); int pcap_list_datalinks(pcap_t *, int **); int pcap_set_datalink(pcap_t *, int); void pcap_free_datalinks(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); /* * On at least some versions of NetBSD, we don't want to declare * bpf_filter() here, as it's also be declared in <net/bpf.h>, with a * different signature, but, on other BSD-flavored UN*Xes, it's not * declared in <net/bpf.h>, so we *do* want to declare it here, so it's * declared when we build pcap-bpf.c. */ #ifndef __NetBSD__ u_int bpf_filter(const struct bpf_insn *, const u_char *, u_int, u_int); #endif int bpf_validate(const struct bpf_insn *f, int len); char *bpf_image(const struct bpf_insn *, int); void bpf_dump(const 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); Adapter *pcap_get_adapter(pcap_t *p); #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 /* lib_pcap_pcap_h */