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Current Path: /usr/src/contrib/libpcap

📁 ..
📄 CHANGES(41.04 KB)
📄 CMakeLists.txt(84.97 KB)
📄 CONTRIBUTING.md(1.41 KB)
📄 CREDITS(11.47 KB)
📁 ChmodBPF
📄 INSTALL.md(15.44 KB)
📄 LICENSE(868 B)
📄 Makefile-devel-adds(614 B)
📄 Makefile.in(23.68 KB)
📄 README.md(3.71 KB)
📄 TODO(1.51 KB)
📄 VERSION(6 B)
📁 Win32
📄 aclocal.m4(30.92 KB)
📄 arcnet.h(2.39 KB)
📄 atmuni31.h(3.87 KB)
📄 bpf_dump.c(1.9 KB)
📄 bpf_filter.c(12.22 KB)
📄 bpf_image.c(7.38 KB)
📄 chmod_bpf(757 B)
📁 cmake
📄 cmake_uninstall.cmake.in(1.01 KB)
📄 cmakeconfig.h.in(11.15 KB)
📄 config.guess(43.17 KB)
📄 config.h.in(10.25 KB)
📄 config.sub(34.93 KB)
📄 configure(331.21 KB)
📄 configure.ac(64.36 KB)
📄 diag-control.h(8.3 KB)
📄 dlpisubs.c(9.41 KB)
📄 dlpisubs.h(702 B)
📁 doc
📄 etherent.c(3.43 KB)
📄 ethertype.h(3.47 KB)
📄 extract.h(9.23 KB)
📄 fad-getad.c(8.62 KB)
📄 fad-gifc.c(12.84 KB)
📄 fad-glifc.c(9.37 KB)
📄 fmtutils.c(6.35 KB)
📄 fmtutils.h(2.19 KB)
📄 ftmacros.h(4.22 KB)
📄 gencode.c(257 KB)
📄 gencode.h(11.44 KB)
📄 grammar.y(24.66 KB)
📄 ieee80211.h(5.25 KB)
📄 install-sh(5.45 KB)
📁 lbl
📄 libpcap.pc.in(484 B)
📄 llc.h(2.56 KB)
📁 missing
📄 mkdep(2.43 KB)
📁 msdos
📄 nametoaddr.c(18.83 KB)
📄 nametoaddr.h(2.12 KB)
📄 nlpid.h(1.66 KB)
📄 nomkdep(135 B)
📄 optimize.c(62.27 KB)
📄 optimize.h(1.29 KB)
📄 org.tcpdump.chmod_bpf.plist(441 B)
📁 pcap
📄 pcap-bpf.c(84.02 KB)
📄 pcap-bpf.h(2.24 KB)
📄 pcap-bt-linux.c(11.42 KB)
📄 pcap-bt-linux.h(1.76 KB)
📄 pcap-bt-monitor-linux.c(7.84 KB)
📄 pcap-bt-monitor-linux.h(1.64 KB)
📄 pcap-common.c(47.14 KB)
📄 pcap-common.h(2.29 KB)
📄 pcap-config.1(2.27 KB)
📄 pcap-config.in(1.8 KB)
📄 pcap-dag.c(37.15 KB)
📄 pcap-dag.h(457 B)
📄 pcap-dbus.c(10.03 KB)
📄 pcap-dbus.h(112 B)
📄 pcap-dll.rc(1.03 KB)
📄 pcap-dlpi.c(47.56 KB)
📄 pcap-dos.c(35.9 KB)
📄 pcap-dos.h(6.7 KB)
📄 pcap-enet.c(4.74 KB)
📄 pcap-filter.manmisc.in(33.54 KB)
📄 pcap-int.h(16.94 KB)
📄 pcap-libdlpi.c(12.11 KB)
📄 pcap-linktype.manmisc.in(2.33 KB)
📄 pcap-linux.c(207.89 KB)
📄 pcap-namedb.h(1.98 KB)
📄 pcap-netfilter-linux.c(20.48 KB)
📄 pcap-netfilter-linux.h(1.67 KB)
📄 pcap-netmap.c(7.82 KB)
📄 pcap-netmap.h(126 B)
📄 pcap-new.c(12.79 KB)
📄 pcap-nit.c(10.2 KB)
📄 pcap-npf.c(51.61 KB)
📄 pcap-null.c(1.9 KB)
📄 pcap-pf.c(18.48 KB)
📄 pcap-rdmasniff.c(10.98 KB)
📄 pcap-rdmasniff.h(140 B)
📄 pcap-rpcap-int.h(3.43 KB)
📄 pcap-rpcap.c(96.91 KB)
📄 pcap-rpcap.h(2.19 KB)
📄 pcap-savefile.manfile.in(5.11 KB)
📄 pcap-septel.c(8.69 KB)
📄 pcap-septel.h(512 B)
📄 pcap-sita.c(36.34 KB)
📄 pcap-sita.h(224 B)
📄 pcap-sita.html(37.43 KB)
📄 pcap-snf.c(14.75 KB)
📄 pcap-snf.h(110 B)
📄 pcap-snit.c(12.67 KB)
📄 pcap-snoop.c(13.26 KB)
📄 pcap-tc.c(34.21 KB)
📄 pcap-tc.h(1.9 KB)
📄 pcap-tstamp.manmisc.in(7.7 KB)
📄 pcap-types.h(1.93 KB)
📄 pcap-usb-linux.c(35.89 KB)
📄 pcap-usb-linux.h(1.75 KB)
📄 pcap.3pcap.in(29.62 KB)
📄 pcap.c(103.69 KB)
📄 pcap.h(2.17 KB)
📄 pcap_activate.3pcap(3.8 KB)
📄 pcap_breakloop.3pcap(3.98 KB)
📄 pcap_can_set_rfmon.3pcap(2.63 KB)
📄 pcap_close.3pcap(1.47 KB)
📄 pcap_compile.3pcap.in(3.02 KB)
📄 pcap_create.3pcap(2.19 KB)
📄 pcap_datalink.3pcap.in(2.39 KB)
📄 pcap_datalink_name_to_val.3pcap(1.82 KB)
📄 pcap_datalink_val_to_name.3pcap(2.47 KB)
📄 pcap_dump.3pcap(1.73 KB)
📄 pcap_dump_close.3pcap(1.49 KB)
📄 pcap_dump_file.3pcap(1.54 KB)
📄 pcap_dump_flush.3pcap(1.69 KB)
📄 pcap_dump_ftell.3pcap(2.11 KB)
📄 pcap_dump_open.3pcap.in(3.31 KB)
📄 pcap_file.3pcap(2.06 KB)
📄 pcap_fileno.3pcap(2 KB)
📄 pcap_findalldevs.3pcap(6.25 KB)
📄 pcap_freecode.3pcap(1.67 KB)
📄 pcap_get_required_select_timeout.3pcap(3.04 KB)
📄 pcap_get_selectable_fd.3pcap(4.66 KB)
📄 pcap_get_tstamp_precision.3pcap.in(1.83 KB)
📄 pcap_geterr.3pcap(1.84 KB)
📄 pcap_inject.3pcap(3.34 KB)
📄 pcap_is_swapped.3pcap(1.91 KB)
📄 pcap_lib_version.3pcap(1.6 KB)
📄 pcap_list_datalinks.3pcap.in(2.54 KB)
📄 pcap_list_tstamp_types.3pcap.in(2.98 KB)
📄 pcap_lookupdev.3pcap(2.47 KB)
📄 pcap_lookupnet.3pcap(1.95 KB)
📄 pcap_loop.3pcap(6.58 KB)
📄 pcap_major_version.3pcap(1.96 KB)
📄 pcap_next_ex.3pcap(4.86 KB)
📄 pcap_offline_filter.3pcap(1.95 KB)
📄 pcap_open_dead.3pcap.in(2.65 KB)
📄 pcap_open_live.3pcap(2.65 KB)
📄 pcap_open_offline.3pcap.in(3.8 KB)
📄 pcap_set_buffer_size.3pcap(1.79 KB)
📄 pcap_set_datalink.3pcap(1.84 KB)
📄 pcap_set_immediate_mode.3pcap.in(3.27 KB)
📄 pcap_set_promisc.3pcap(1.82 KB)
📄 pcap_set_protocol_linux.3pcap(2.81 KB)
📄 pcap_set_rfmon.3pcap(1.82 KB)
📄 pcap_set_snaplen.3pcap(1.74 KB)
📄 pcap_set_timeout.3pcap(2.15 KB)
📄 pcap_set_tstamp_precision.3pcap.in(2.38 KB)
📄 pcap_set_tstamp_type.3pcap.in(2.73 KB)
📄 pcap_setdirection.3pcap(2.36 KB)
📄 pcap_setfilter.3pcap(1.79 KB)
📄 pcap_setnonblock.3pcap(2.82 KB)
📄 pcap_snapshot.3pcap(1.91 KB)
📄 pcap_stats.3pcap(3.35 KB)
📄 pcap_statustostr.3pcap(1.55 KB)
📄 pcap_strerror.3pcap(1.54 KB)
📄 pcap_tstamp_type_name_to_val.3pcap(1.87 KB)
📄 pcap_tstamp_type_val_to_name.3pcap(1.99 KB)
📄 portability.h(5.46 KB)
📄 ppp.h(2.62 KB)
📄 rpcap-protocol.c(6.67 KB)
📄 rpcap-protocol.h(18.61 KB)
📁 rpcapd
📄 savefile.c(13.72 KB)
📄 scanner.l(14.36 KB)
📄 sf-pcap.c(30.33 KB)
📄 sf-pcap.h(1.69 KB)
📄 sf-pcapng.c(38.9 KB)
📄 sf-pcapng.h(1.41 KB)
📄 sockutils.c(52.26 KB)
📄 sockutils.h(5.22 KB)
📄 sunatmpos.h(2.09 KB)
📁 testprogs
📁 tests
📄 varattrs.h(2.38 KB)

Editing: savefile.c

/*
 * 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: (1) source code distributions
 * retain the above copyright notice and this paragraph in its entirety, (2)
 * distributions including binary code include the above copyright notice and
 * this paragraph in its entirety in the documentation or other materials
 * provided with the distribution, and (3) all advertising materials mentioning
 * features or use of this software display the following acknowledgement:
 * ``This product includes software developed by the University of California,
 * Lawrence Berkeley Laboratory and its contributors.'' Neither the name of
 * the University nor the names of its contributors may be used to endorse
 * or promote products derived from this software without specific prior
 * written permission.
 * THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR IMPLIED
 * WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED WARRANTIES OF
 * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.
 *
 * savefile.c - supports offline use of tcpdump
 *	Extraction/creation by Jeffrey Mogul, DECWRL
 *	Modified by Steve McCanne, LBL.
 *
 * Used to save the received packet headers, after filtering, to
 * a file, and then read them later.
 * The first record in the file contains saved values for the machine
 * dependent values so we can print the dump file on any architecture.
 */

#ifdef HAVE_CONFIG_H
#include <config.h>
#endif

#include <pcap-types.h>
#ifdef _WIN32
#include <io.h>
#include <fcntl.h>
#endif /* _WIN32 */

#include <errno.h>
#include <memory.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <limits.h> /* for INT_MAX */

#include "pcap-int.h"

#ifdef HAVE_OS_PROTO_H
#include "os-proto.h"
#endif

#include "sf-pcap.h"
#include "sf-pcapng.h"
#include "pcap-common.h"

#ifdef _WIN32
/*
 * These aren't exported on Windows, because they would only work if both
 * WinPcap/Npcap and the code using it were to use the Universal CRT; otherwise,
 * a FILE structure in WinPcap/Npcap and a FILE structure in the code using it
 * could be different if they're using different versions of the C runtime.
 *
 * Instead, pcap/pcap.h defines them as macros that wrap the hopen versions,
 * with the wrappers calling _fileno() and _get_osfhandle() themselves,
 * so that they convert the appropriate CRT version's FILE structure to
 * a HANDLE (which is OS-defined, not CRT-defined, and is part of the Win32
 * and Win64 ABIs).
 */
static pcap_t *pcap_fopen_offline_with_tstamp_precision(FILE *, u_int, char *);
static pcap_t *pcap_fopen_offline(FILE *, char *);
#endif

/*
 * Setting O_BINARY on DOS/Windows is a bit tricky
 */
#if defined(_WIN32)
  #define SET_BINMODE(f)  _setmode(_fileno(f), _O_BINARY)
#elif defined(MSDOS)
  #if defined(__HIGHC__)
  #define SET_BINMODE(f)  setmode(f, O_BINARY)
  #else
  #define SET_BINMODE(f)  setmode(fileno(f), O_BINARY)
  #endif
#endif

static int
sf_getnonblock(pcap_t *p _U_)
{
	/*
	 * This is a savefile, not a live capture file, so never say
	 * it's in non-blocking mode.
	 */
	return (0);
}

static int
sf_setnonblock(pcap_t *p, int nonblock _U_)
{
	/*
	 * This is a savefile, not a live capture file, so reject
	 * requests to put it in non-blocking mode.  (If it's a
	 * pipe, it could be put in non-blocking mode, but that
	 * would significantly complicate the code to read packets,
	 * as it would have to handle reading partial packets and
	 * keeping the state of the read.)
	 */
	pcap_snprintf(p->errbuf, PCAP_ERRBUF_SIZE,
	    "Savefiles cannot be put into non-blocking mode");
	return (-1);
}

static int
sf_stats(pcap_t *p, struct pcap_stat *ps _U_)
{
	pcap_snprintf(p->errbuf, PCAP_ERRBUF_SIZE,
	    "Statistics aren't available from savefiles");
	return (-1);
}

#ifdef _WIN32
static struct pcap_stat *
sf_stats_ex(pcap_t *p, int *size)
{
	pcap_snprintf(p->errbuf, PCAP_ERRBUF_SIZE,
	    "Statistics aren't available from savefiles");
	return (NULL);
}

static int
sf_setbuff(pcap_t *p, int dim)
{
	pcap_snprintf(p->errbuf, PCAP_ERRBUF_SIZE,
	    "The kernel buffer size cannot be set while reading from a file");
	return (-1);
}

static int
sf_setmode(pcap_t *p, int mode)
{
	pcap_snprintf(p->errbuf, PCAP_ERRBUF_SIZE,
	    "impossible to set mode while reading from a file");
	return (-1);
}

static int
sf_setmintocopy(pcap_t *p, int size)
{
	pcap_snprintf(p->errbuf, PCAP_ERRBUF_SIZE,
	    "The mintocopy parameter cannot be set while reading from a file");
	return (-1);
}

static HANDLE
sf_getevent(pcap_t *pcap)
{
	(void)pcap_snprintf(pcap->errbuf, sizeof(pcap->errbuf),
	    "The read event cannot be retrieved while reading from a file");
	return (INVALID_HANDLE_VALUE);
}

static int
sf_oid_get_request(pcap_t *p, bpf_u_int32 oid _U_, void *data _U_,
    size_t *lenp _U_)
{
	pcap_snprintf(p->errbuf, PCAP_ERRBUF_SIZE,
	    "An OID get request cannot be performed on a file");
	return (PCAP_ERROR);
}

static int
sf_oid_set_request(pcap_t *p, bpf_u_int32 oid _U_, const void *data _U_,
    size_t *lenp _U_)
{
	pcap_snprintf(p->errbuf, PCAP_ERRBUF_SIZE,
	    "An OID set request cannot be performed on a file");
	return (PCAP_ERROR);
}

static u_int
sf_sendqueue_transmit(pcap_t *p, pcap_send_queue *queue, int sync)
{
	pcap_strlcpy(p->errbuf, "Sending packets isn't supported on savefiles",
	    PCAP_ERRBUF_SIZE);
	return (0);
}

static int
sf_setuserbuffer(pcap_t *p, int size)
{
	pcap_snprintf(p->errbuf, PCAP_ERRBUF_SIZE,
	    "The user buffer cannot be set when reading from a file");
	return (-1);
}

static int
sf_live_dump(pcap_t *p, char *filename, int maxsize, int maxpacks)
{
	pcap_snprintf(p->errbuf, PCAP_ERRBUF_SIZE,
	    "Live packet dumping cannot be performed when reading from a file");
	return (-1);
}

static int
sf_live_dump_ended(pcap_t *p, int sync)
{
	pcap_snprintf(p->errbuf, PCAP_ERRBUF_SIZE,
	    "Live packet dumping cannot be performed on a pcap_open_dead pcap_t");
	return (-1);
}

static PAirpcapHandle
sf_get_airpcap_handle(pcap_t *pcap)
{
	return (NULL);
}
#endif

static int
sf_inject(pcap_t *p, const void *buf _U_, size_t size _U_)
{
	pcap_strlcpy(p->errbuf, "Sending packets isn't supported on savefiles",
	    PCAP_ERRBUF_SIZE);
	return (-1);
}

/*
 * Set direction flag: Which packets do we accept on a forwarding
 * single device? IN, OUT or both?
 */
static int
sf_setdirection(pcap_t *p, pcap_direction_t d _U_)
{
	pcap_snprintf(p->errbuf, sizeof(p->errbuf),
	    "Setting direction is not supported on savefiles");
	return (-1);
}

void
sf_cleanup(pcap_t *p)
{
	if (p->rfile != stdin)
		(void)fclose(p->rfile);
	if (p->buffer != NULL)
		free(p->buffer);
	pcap_freecode(&p->fcode);
}

pcap_t *
pcap_open_offline_with_tstamp_precision(const char *fname, u_int precision,
					char *errbuf)
{
	FILE *fp;
	pcap_t *p;

if (fname == NULL) {
		pcap_snprintf(errbuf, PCAP_ERRBUF_SIZE,
		    "A null pointer was supplied as the file name");
		return (NULL);
	}
	if (fname[0] == '-' && fname[1] == '\0')
	{
		fp = stdin;
#if defined(_WIN32) || defined(MSDOS)
		/*
		 * We're reading from the standard input, so put it in binary
		 * mode, as savefiles are binary files.
		 */
		SET_BINMODE(fp);
#endif
	}
	else {
		/*
		 * "b" is supported as of C90, so *all* UN*Xes should
		 * support it, even though it does nothing.  It's
		 * required on Windows, as the file is a binary file
		 * and must be read in binary mode.
		 */
		fp = fopen(fname, "rb");
		if (fp == NULL) {
			pcap_fmt_errmsg_for_errno(errbuf, PCAP_ERRBUF_SIZE,
			    errno, "%s", fname);
			return (NULL);
		}
	}
	p = pcap_fopen_offline_with_tstamp_precision(fp, precision, errbuf);
	if (p == NULL) {
		if (fp != stdin)
			fclose(fp);
	}
	return (p);
}

pcap_t *
pcap_open_offline(const char *fname, char *errbuf)
{
	return (pcap_open_offline_with_tstamp_precision(fname,
	    PCAP_TSTAMP_PRECISION_MICRO, errbuf));
}

#ifdef _WIN32
pcap_t* pcap_hopen_offline_with_tstamp_precision(intptr_t osfd, u_int precision,
    char *errbuf)
{
	int fd;
	FILE *file;

fd = _open_osfhandle(osfd, _O_RDONLY);
	if ( fd < 0 )
	{
		pcap_fmt_errmsg_for_errno(errbuf, PCAP_ERRBUF_SIZE,
		    errno, "_open_osfhandle");
		return NULL;
	}

file = _fdopen(fd, "rb");
	if ( file == NULL )
	{
		pcap_fmt_errmsg_for_errno(errbuf, PCAP_ERRBUF_SIZE,
		    errno, "_fdopen");
		_close(fd);
		return NULL;
	}

return pcap_fopen_offline_with_tstamp_precision(file, precision,
	    errbuf);
}

pcap_t* pcap_hopen_offline(intptr_t osfd, char *errbuf)
{
	return pcap_hopen_offline_with_tstamp_precision(osfd,
	    PCAP_TSTAMP_PRECISION_MICRO, errbuf);
}
#endif

/*
 * Given a link-layer header type and snapshot length, return a
 * snapshot length to use when reading the file; it's guaranteed
 * to be > 0 and <= INT_MAX.
 *
 * XXX - the only reason why we limit it to <= INT_MAX is so that
 * it fits in p->snapshot, and the only reason that p->snapshot is
 * signed is that pcap_snapshot() returns an int, not an unsigned int.
 */
bpf_u_int32
pcap_adjust_snapshot(bpf_u_int32 linktype, bpf_u_int32 snaplen)
{
	if (snaplen == 0 || snaplen > INT_MAX) {
		/*
		 * Bogus snapshot length; use the maximum for this
		 * link-layer type as a fallback.
		 *
		 * XXX - we don't clamp snapshot lengths that are
		 * <= INT_MAX but > max_snaplen_for_dlt(linktype),
		 * so a capture file could cause us to allocate
		 * a Really Big Buffer.
		 */
		snaplen = max_snaplen_for_dlt(linktype);
	}
	return snaplen;
}

static pcap_t *(*check_headers[])(const uint8_t *, FILE *, u_int, char *, int *) = {
	pcap_check_header,
	pcap_ng_check_header
};

#define	N_FILE_TYPES	(sizeof check_headers / sizeof check_headers[0])

#ifdef _WIN32
static
#endif
pcap_t *
pcap_fopen_offline_with_tstamp_precision(FILE *fp, u_int precision,
    char *errbuf)
{
	register pcap_t *p;
	uint8_t magic[4];
	size_t amt_read;
	u_int i;
	int err;

/*
	 * Read the first 4 bytes of the file; the network analyzer dump
	 * file formats we support (pcap and pcapng), and several other
	 * formats we might support in the future (such as snoop, DOS and
	 * Windows Sniffer, and Microsoft Network Monitor) all have magic
	 * numbers that are unique in their first 4 bytes.
	 */
	amt_read = fread(&magic, 1, sizeof(magic), fp);
	if (amt_read != sizeof(magic)) {
		if (ferror(fp)) {
			pcap_fmt_errmsg_for_errno(errbuf, PCAP_ERRBUF_SIZE,
			    errno, "error reading dump file");
		} else {
			pcap_snprintf(errbuf, PCAP_ERRBUF_SIZE,
			    "truncated dump file; tried to read %" PRIsize " file header bytes, only got %" PRIsize,
			    sizeof(magic), amt_read);
		}
		return (NULL);
	}

/*
	 * Try all file types.
	 */
	for (i = 0; i < N_FILE_TYPES; i++) {
		p = (*check_headers[i])(magic, fp, precision, errbuf, &err);
		if (p != NULL) {
			/* Yup, that's it. */
			goto found;
		}
		if (err) {
			/*
			 * Error trying to read the header.
			 */
			return (NULL);
		}
	}

/*
	 * Well, who knows what this mess is....
	 */
	pcap_snprintf(errbuf, PCAP_ERRBUF_SIZE, "unknown file format");
	return (NULL);

found:
	p->rfile = fp;

/* Padding only needed for live capture fcode */
	p->fddipad = 0;

#if !defined(_WIN32) && !defined(MSDOS)
	/*
	 * You can do "select()" and "poll()" on plain files on most
	 * platforms, and should be able to do so on pipes.
	 *
	 * You can't do "select()" on anything other than sockets in
	 * Windows, so, on Win32 systems, we don't have "selectable_fd".
	 */
	p->selectable_fd = fileno(fp);
#endif

p->read_op = pcap_offline_read;
	p->inject_op = sf_inject;
	p->setfilter_op = install_bpf_program;
	p->setdirection_op = sf_setdirection;
	p->set_datalink_op = NULL;	/* we don't support munging link-layer headers */
	p->getnonblock_op = sf_getnonblock;
	p->setnonblock_op = sf_setnonblock;
	p->stats_op = sf_stats;
#ifdef _WIN32
	p->stats_ex_op = sf_stats_ex;
	p->setbuff_op = sf_setbuff;
	p->setmode_op = sf_setmode;
	p->setmintocopy_op = sf_setmintocopy;
	p->getevent_op = sf_getevent;
	p->oid_get_request_op = sf_oid_get_request;
	p->oid_set_request_op = sf_oid_set_request;
	p->sendqueue_transmit_op = sf_sendqueue_transmit;
	p->setuserbuffer_op = sf_setuserbuffer;
	p->live_dump_op = sf_live_dump;
	p->live_dump_ended_op = sf_live_dump_ended;
	p->get_airpcap_handle_op = sf_get_airpcap_handle;
#endif

/*
	 * For offline captures, the standard one-shot callback can
	 * be used for pcap_next()/pcap_next_ex().
	 */
	p->oneshot_callback = pcap_oneshot;

/*
	 * Savefiles never require special BPF code generation.
	 */
	p->bpf_codegen_flags = 0;

p->activated = 1;

return (p);
}

#ifdef _WIN32
static
#endif
pcap_t *
pcap_fopen_offline(FILE *fp, char *errbuf)
{
	return (pcap_fopen_offline_with_tstamp_precision(fp,
	    PCAP_TSTAMP_PRECISION_MICRO, errbuf));
}

/*
 * Read packets from a capture file, and call the callback for each
 * packet.
 * If cnt > 0, return after 'cnt' packets, otherwise continue until eof.
 */
int
pcap_offline_read(pcap_t *p, int cnt, pcap_handler callback, u_char *user)
{
	struct bpf_insn *fcode;
	int status = 0;
	int n = 0;
	u_char *data;

while (status == 0) {
		struct pcap_pkthdr h;

/*
		 * Has "pcap_breakloop()" been called?
		 * If so, return immediately - if we haven't read any
		 * packets, clear the flag and return -2 to indicate
		 * that we were told to break out of the loop, otherwise
		 * leave the flag set, so that the *next* call will break
		 * out of the loop without having read any packets, and
		 * return the number of packets we've processed so far.
		 */
		if (p->break_loop) {
			if (n == 0) {
				p->break_loop = 0;
				return (-2);
			} else
				return (n);
		}

status = p->next_packet_op(p, &h, &data);
		if (status) {
			if (status == 1)
				return (0);
			return (status);
		}

if ((fcode = p->fcode.bf_insns) == NULL ||
		    bpf_filter(fcode, data, h.len, h.caplen)) {
			(*callback)(user, &h, data);
			if (++n >= cnt && cnt > 0)
				break;
		}
	}
	/*XXX this breaks semantics tcpslice expects */
	return (n);
}

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