464 lines
14 KiB
C
Executable File
464 lines
14 KiB
C
Executable File
/*
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* Copyright (c) 1994, 1995, 1996
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* The Regents of the University of California. All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. All advertising materials mentioning features or use of this software
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* must display the following acknowledgement:
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* This product includes software developed by the Computer Systems
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* Engineering Group at Lawrence Berkeley Laboratory.
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* 4. Neither the name of the University nor of the Laboratory may be used
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* to endorse or promote products derived from this software without
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* specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*/
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#ifndef pcap_int_h
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#define pcap_int_h
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#include <pcap/pcap.h>
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#ifdef __cplusplus
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extern "C" {
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#endif
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#ifdef WIN32
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#include <Packet32.h>
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extern CRITICAL_SECTION g_PcapCompileCriticalSection;
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#endif /* WIN32 */
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#ifdef MSDOS
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#include <fcntl.h>
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#include <io.h>
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#endif
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#if (defined(_MSC_VER) && (_MSC_VER <= 1200)) /* we are compiling with Visual Studio 6, that doesn't support the LL suffix*/
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/*
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* Swap byte ordering of unsigned long long timestamp on a big endian
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* machine.
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*/
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#define SWAPLL(ull) ((ull & 0xff00000000000000) >> 56) | \
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((ull & 0x00ff000000000000) >> 40) | \
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((ull & 0x0000ff0000000000) >> 24) | \
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((ull & 0x000000ff00000000) >> 8) | \
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((ull & 0x00000000ff000000) << 8) | \
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((ull & 0x0000000000ff0000) << 24) | \
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((ull & 0x000000000000ff00) << 40) | \
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((ull & 0x00000000000000ff) << 56)
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#else /* A recent Visual studio compiler or not VC */
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/*
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* Swap byte ordering of unsigned long long timestamp on a big endian
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* machine.
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*/
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#define SWAPLL(ull) ((ull & 0xff00000000000000LL) >> 56) | \
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((ull & 0x00ff000000000000LL) >> 40) | \
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((ull & 0x0000ff0000000000LL) >> 24) | \
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((ull & 0x000000ff00000000LL) >> 8) | \
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((ull & 0x00000000ff000000LL) << 8) | \
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((ull & 0x0000000000ff0000LL) << 24) | \
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((ull & 0x000000000000ff00LL) << 40) | \
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((ull & 0x00000000000000ffLL) << 56)
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#endif /* _MSC_VER */
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/*
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* Maximum snapshot length.
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*
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* Somewhat arbitrary, but chosen to be:
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*
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* 1) big enough for maximum-size Linux loopback packets (65549)
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* and some USB packets captured with USBPcap:
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*
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* http://desowin.org/usbpcap/
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*
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* (> 131072, < 262144)
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*
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* and
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*
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* 2) small enough not to cause attempts to allocate huge amounts of
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* memory; some applications might use the snapshot length in a
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* savefile header to control the size of the buffer they allocate,
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* so a size of, say, 2^31-1 might not work well.
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*
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* We don't enforce this in pcap_set_snaplen(), but we use it internally.
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*/
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#define MAXIMUM_SNAPLEN 262144
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struct pcap_opt {
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char *source;
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int timeout; /* timeout for buffering */
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int buffer_size;
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int promisc;
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int rfmon; /* monitor mode */
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int immediate; /* immediate mode - deliver packets as soon as they arrive */
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int tstamp_type;
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int tstamp_precision;
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};
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typedef int (*activate_op_t)(pcap_t *);
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typedef int (*can_set_rfmon_op_t)(pcap_t *);
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typedef int (*read_op_t)(pcap_t *, int cnt, pcap_handler, u_char *);
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typedef int (*inject_op_t)(pcap_t *, const void *, size_t);
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typedef int (*setfilter_op_t)(pcap_t *, struct bpf_program *);
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typedef int (*setdirection_op_t)(pcap_t *, pcap_direction_t);
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typedef int (*set_datalink_op_t)(pcap_t *, int);
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typedef int (*getnonblock_op_t)(pcap_t *, char *);
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typedef int (*setnonblock_op_t)(pcap_t *, int, char *);
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typedef int (*stats_op_t)(pcap_t *, struct pcap_stat *);
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#ifdef WIN32
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typedef int (*setbuff_op_t)(pcap_t *, int);
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typedef int (*setmode_op_t)(pcap_t *, int);
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typedef int (*setmintocopy_op_t)(pcap_t *, int);
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typedef Adapter *(*getadapter_op_t)(pcap_t *);
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#endif
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typedef void (*cleanup_op_t)(pcap_t *);
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/*
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* We put all the stuff used in the read code path at the beginning,
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* to try to keep it together in the same cache line or lines.
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*/
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struct pcap {
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/*
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* Method to call to read packets on a live capture.
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*/
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read_op_t read_op;
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/*
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* Method to call to read to read packets from a savefile.
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*/
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int (*next_packet_op)(pcap_t *, struct pcap_pkthdr *, u_char **);
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#ifdef WIN32
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ADAPTER *adapter;
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LPPACKET Packet;
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int nonblock;
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#else
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int fd;
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int selectable_fd;
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#endif /* WIN32 */
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/*
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* Read buffer.
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*/
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int bufsize;
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u_char *buffer;
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u_char *bp;
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int cc;
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int break_loop; /* flag set to force break from packet-reading loop */
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void *priv; /* private data for methods */
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int swapped;
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FILE *rfile; /* null if live capture, non-null if savefile */
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int fddipad;
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struct pcap *next; /* list of open pcaps that need stuff cleared on close */
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/*
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* File version number; meaningful only for a savefile, but we
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* keep it here so that apps that (mistakenly) ask for the
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* version numbers will get the same zero values that they
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* always did.
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*/
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int version_major;
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int version_minor;
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int snapshot;
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int linktype; /* Network linktype */
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int linktype_ext; /* Extended information stored in the linktype field of a file */
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int tzoff; /* timezone offset */
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int offset; /* offset for proper alignment */
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int activated; /* true if the capture is really started */
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int oldstyle; /* if we're opening with pcap_open_live() */
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struct pcap_opt opt;
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/*
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* Place holder for pcap_next().
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*/
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u_char *pkt;
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/* We're accepting only packets in this direction/these directions. */
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pcap_direction_t direction;
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/*
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* Flags to affect BPF code generation.
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*/
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int bpf_codegen_flags;
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/*
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* Placeholder for filter code if bpf not in kernel.
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*/
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struct bpf_program fcode;
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char errbuf[PCAP_ERRBUF_SIZE + 1];
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int dlt_count;
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u_int *dlt_list;
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int tstamp_type_count;
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u_int *tstamp_type_list;
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int tstamp_precision_count;
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u_int *tstamp_precision_list;
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struct pcap_pkthdr pcap_header; /* This is needed for the pcap_next_ex() to work */
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/*
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* More methods.
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*/
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activate_op_t activate_op;
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can_set_rfmon_op_t can_set_rfmon_op;
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inject_op_t inject_op;
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setfilter_op_t setfilter_op;
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setdirection_op_t setdirection_op;
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set_datalink_op_t set_datalink_op;
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getnonblock_op_t getnonblock_op;
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setnonblock_op_t setnonblock_op;
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stats_op_t stats_op;
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/*
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* Routine to use as callback for pcap_next()/pcap_next_ex().
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*/
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pcap_handler oneshot_callback;
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#ifdef WIN32
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/*
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* These are, at least currently, specific to the Win32 NPF
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* driver.
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*/
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setbuff_op_t setbuff_op;
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setmode_op_t setmode_op;
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setmintocopy_op_t setmintocopy_op;
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getadapter_op_t getadapter_op;
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#endif
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cleanup_op_t cleanup_op;
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};
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/*
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* BPF code generation flags.
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*/
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#define BPF_SPECIAL_VLAN_HANDLING 0x00000001 /* special VLAN handling for Linux */
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/*
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* This is a timeval as stored in a savefile.
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* It has to use the same types everywhere, independent of the actual
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* `struct timeval'; `struct timeval' has 32-bit tv_sec values on some
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* platforms and 64-bit tv_sec values on other platforms, and writing
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* out native `struct timeval' values would mean files could only be
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* read on systems with the same tv_sec size as the system on which
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* the file was written.
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*/
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struct pcap_timeval {
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bpf_int32 tv_sec; /* seconds */
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bpf_int32 tv_usec; /* microseconds */
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};
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/*
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* This is a `pcap_pkthdr' as actually stored in a savefile.
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*
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* Do not change the format of this structure, in any way (this includes
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* changes that only affect the length of fields in this structure),
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* and do not make the time stamp anything other than seconds and
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* microseconds (e.g., seconds and nanoseconds). Instead:
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*
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* introduce a new structure for the new format;
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*
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* send mail to "tcpdump-workers@lists.tcpdump.org", requesting
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* a new magic number for your new capture file format, and, when
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* you get the new magic number, put it in "savefile.c";
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*
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* use that magic number for save files with the changed record
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* header;
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*
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* make the code in "savefile.c" capable of reading files with
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* the old record header as well as files with the new record header
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* (using the magic number to determine the header format).
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*
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* Then supply the changes by forking the branch at
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*
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* https://github.com/the-tcpdump-group/libpcap/issues
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*
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* and issuing a pull request, so that future versions of libpcap and
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* programs that use it (such as tcpdump) will be able to read your new
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* capture file format.
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*/
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struct pcap_sf_pkthdr {
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struct pcap_timeval ts; /* time stamp */
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bpf_u_int32 caplen; /* length of portion present */
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bpf_u_int32 len; /* length this packet (off wire) */
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};
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/*
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* How a `pcap_pkthdr' is actually stored in savefiles written
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* by some patched versions of libpcap (e.g. the ones in Red
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* Hat Linux 6.1 and 6.2).
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*
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* Do not change the format of this structure, in any way (this includes
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* changes that only affect the length of fields in this structure).
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* Instead, introduce a new structure, as per the above.
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*/
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struct pcap_sf_patched_pkthdr {
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struct pcap_timeval ts; /* time stamp */
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bpf_u_int32 caplen; /* length of portion present */
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bpf_u_int32 len; /* length this packet (off wire) */
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int index;
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unsigned short protocol;
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unsigned char pkt_type;
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};
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/*
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* User data structure for the one-shot callback used for pcap_next()
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* and pcap_next_ex().
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*/
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struct oneshot_userdata {
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struct pcap_pkthdr *hdr;
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const u_char **pkt;
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pcap_t *pd;
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};
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int yylex(void);
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#ifndef min
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#define min(a, b) ((a) > (b) ? (b) : (a))
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#endif
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/* XXX should these be in pcap.h? */
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int pcap_offline_read(pcap_t *, int, pcap_handler, u_char *);
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int pcap_read(pcap_t *, int cnt, pcap_handler, u_char *);
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#ifndef HAVE_STRLCPY
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#define strlcpy(x, y, z) \
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(strncpy((x), (y), (z)), \
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((z) <= 0 ? 0 : ((x)[(z) - 1] = '\0')), \
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strlen((y)))
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#endif
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#include <stdarg.h>
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#if !defined(HAVE_SNPRINTF)
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#define snprintf pcap_snprintf
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extern int snprintf (char *, size_t, const char *, ...);
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#endif
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#if !defined(HAVE_VSNPRINTF)
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#define vsnprintf pcap_vsnprintf
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extern int vsnprintf (char *, size_t, const char *, va_list ap);
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#endif
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/*
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* Does the packet count argument to a module's read routine say
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* "supply packets until you run out of packets"?
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*/
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#define PACKET_COUNT_IS_UNLIMITED(count) ((count) <= 0)
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/*
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* Routines that most pcap implementations can use for non-blocking mode.
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*/
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#if !defined(WIN32) && !defined(MSDOS)
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int pcap_getnonblock_fd(pcap_t *, char *);
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int pcap_setnonblock_fd(pcap_t *p, int, char *);
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#endif
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/*
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* Internal interfaces for "pcap_create()".
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*
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* "pcap_create_interface()" is the routine to do a pcap_create on
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* a regular network interface. There are multiple implementations
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* of this, one for each platform type (Linux, BPF, DLPI, etc.),
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* with the one used chosen by the configure script.
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*
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* "pcap_create_common()" allocates and fills in a pcap_t, for use
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* by pcap_create routines.
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*/
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pcap_t *pcap_create_interface(const char *, char *);
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pcap_t *pcap_create_common(const char *, char *, size_t);
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int pcap_do_addexit(pcap_t *);
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void pcap_add_to_pcaps_to_close(pcap_t *);
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void pcap_remove_from_pcaps_to_close(pcap_t *);
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void pcap_cleanup_live_common(pcap_t *);
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int pcap_not_initialized(pcap_t *);
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int pcap_check_activated(pcap_t *);
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/*
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* Internal interfaces for "pcap_findalldevs()".
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*
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* "pcap_findalldevs_interfaces()" finds interfaces using the
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* "standard" mechanisms (SIOCGIFCONF, "getifaddrs()", etc.).
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*
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* "pcap_platform_finddevs()" is a platform-dependent routine to
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* add devices not found by the "standard" mechanisms.
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*
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* "pcap_add_if()" adds an interface to the list of interfaces, for
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* use by various "find interfaces" routines.
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*/
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int pcap_findalldevs_interfaces(pcap_if_t **, char *);
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int pcap_platform_finddevs(pcap_if_t **, char *);
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int add_addr_to_iflist(pcap_if_t **, const char *, u_int, struct sockaddr *,
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size_t, struct sockaddr *, size_t, struct sockaddr *, size_t,
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struct sockaddr *, size_t, char *);
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int add_addr_to_dev(pcap_if_t *, struct sockaddr *, size_t,
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struct sockaddr *, size_t, struct sockaddr *, size_t,
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struct sockaddr *dstaddr, size_t, char *errbuf);
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int pcap_add_if(pcap_if_t **, const char *, u_int, const char *, char *);
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struct sockaddr *dup_sockaddr(struct sockaddr *, size_t);
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int add_or_find_if(pcap_if_t **, pcap_if_t **, const char *, u_int,
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const char *, char *);
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/*
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* Internal interfaces for "pcap_open_offline()".
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*
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* "pcap_open_offline_common()" allocates and fills in a pcap_t, for use
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* by pcap_open_offline routines.
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*
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* "sf_cleanup()" closes the file handle associated with a pcap_t, if
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* appropriate, and frees all data common to all modules for handling
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* savefile types.
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*/
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pcap_t *pcap_open_offline_common(char *ebuf, size_t size);
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void sf_cleanup(pcap_t *p);
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/*
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* Internal interfaces for both "pcap_create()" and routines that
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* open savefiles.
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*
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* "pcap_oneshot()" is the standard one-shot callback for "pcap_next()"
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* and "pcap_next_ex()".
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*/
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void pcap_oneshot(u_char *, const struct pcap_pkthdr *, const u_char *);
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#ifdef WIN32
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char *pcap_win32strerror(void);
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#endif
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int install_bpf_program(pcap_t *, struct bpf_program *);
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int pcap_strcasecmp(const char *, const char *);
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#ifdef __cplusplus
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}
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#endif
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#endif
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