154bbe416c
different version has been committed upstream in the libpcap vendor branch.
This will allow people to experiment with zero-copy bpf(4) without requiring
external patches.
Note to enable this functionality:
sysctl net.bpf.zerocopy_enable=1
By default, libpcap will use the legacy buffering method unless this sysctl
variable is set to 1.
For the details about zero-copy bpf(4) implementation see svn change r177548.
Requested by: many
Discussed with: sam
In collaboration with: rwatson
938 lines
26 KiB
C
938 lines
26 KiB
C
/*
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* Copyright (c) 1993, 1994, 1995, 1996, 1997, 1998
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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 lint
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static const char rcsid[] _U_ =
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"@(#) $Header: /tcpdump/master/libpcap/pcap.c,v 1.88.2.19 2007/09/19 02:50:52 guy Exp $ (LBL)";
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|
#endif
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|
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|
#ifdef HAVE_CONFIG_H
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#include "config.h"
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#endif
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|
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#ifdef WIN32
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#include <pcap-stdinc.h>
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#else /* WIN32 */
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#include <sys/types.h>
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#include <sys/mman.h>
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#endif /* WIN32 */
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|
#include <stdio.h>
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|
#include <stdlib.h>
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|
#include <string.h>
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#if !defined(_MSC_VER) && !defined(__BORLANDC__)
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|
#include <unistd.h>
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|
#endif
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|
#include <fcntl.h>
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|
#include <errno.h>
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|
|
|
#ifdef HAVE_OS_PROTO_H
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#include "os-proto.h"
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|
#endif
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|
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|
#ifdef MSDOS
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|
#include "pcap-dos.h"
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|
#endif
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|
|
|
#include "pcap-int.h"
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|
|
|
#ifdef HAVE_DAG_API
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|
#include <dagnew.h>
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#include <dagapi.h>
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|
#endif
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|
|
|
int
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pcap_dispatch(pcap_t *p, int cnt, pcap_handler callback, u_char *user)
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|
{
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|
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return p->read_op(p, cnt, callback, user);
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}
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|
|
|
/*
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|
* XXX - is this necessary?
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|
*/
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|
int
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|
pcap_read(pcap_t *p, int cnt, pcap_handler callback, u_char *user)
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|
{
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|
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|
return p->read_op(p, cnt, callback, user);
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|
}
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|
|
|
int
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|
pcap_loop(pcap_t *p, int cnt, pcap_handler callback, u_char *user)
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|
{
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register int n;
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|
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|
for (;;) {
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|
if (p->sf.rfile != NULL) {
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/*
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|
* 0 means EOF, so don't loop if we get 0.
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|
*/
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|
n = pcap_offline_read(p, cnt, callback, user);
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|
} else {
|
|
/*
|
|
* XXX keep reading until we get something
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|
* (or an error occurs)
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|
*/
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|
do {
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|
n = p->read_op(p, cnt, callback, user);
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|
} while (n == 0);
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|
}
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|
if (n <= 0)
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return (n);
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|
if (cnt > 0) {
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cnt -= n;
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if (cnt <= 0)
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return (0);
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|
}
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|
}
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}
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|
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|
struct singleton {
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struct pcap_pkthdr *hdr;
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const u_char *pkt;
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|
};
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|
|
|
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|
static void
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|
pcap_oneshot(u_char *userData, const struct pcap_pkthdr *h, const u_char *pkt)
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|
{
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|
struct singleton *sp = (struct singleton *)userData;
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|
*sp->hdr = *h;
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|
sp->pkt = pkt;
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|
}
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|
|
|
const u_char *
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pcap_next(pcap_t *p, struct pcap_pkthdr *h)
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|
{
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|
struct singleton s;
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|
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|
s.hdr = h;
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if (pcap_dispatch(p, 1, pcap_oneshot, (u_char*)&s) <= 0)
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return (0);
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return (s.pkt);
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|
}
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|
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|
struct pkt_for_fakecallback {
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|
struct pcap_pkthdr *hdr;
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const u_char **pkt;
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};
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|
|
|
static void
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pcap_fakecallback(u_char *userData, const struct pcap_pkthdr *h,
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const u_char *pkt)
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|
{
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struct pkt_for_fakecallback *sp = (struct pkt_for_fakecallback *)userData;
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|
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|
*sp->hdr = *h;
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*sp->pkt = pkt;
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|
}
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|
|
|
int
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|
pcap_next_ex(pcap_t *p, struct pcap_pkthdr **pkt_header,
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|
const u_char **pkt_data)
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|
{
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|
struct pkt_for_fakecallback s;
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|
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|
s.hdr = &p->pcap_header;
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s.pkt = pkt_data;
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|
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/* Saves a pointer to the packet headers */
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*pkt_header= &p->pcap_header;
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if (p->sf.rfile != NULL) {
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int status;
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/* We are on an offline capture */
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status = pcap_offline_read(p, 1, pcap_fakecallback,
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(u_char *)&s);
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/*
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|
* Return codes for pcap_offline_read() are:
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|
* - 0: EOF
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* - -1: error
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|
* - >1: OK
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* The first one ('0') conflicts with the return code of
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* 0 from pcap_read() meaning "no packets arrived before
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* the timeout expired", so we map it to -2 so you can
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* distinguish between an EOF from a savefile and a
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* "no packets arrived before the timeout expired, try
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* again" from a live capture.
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*/
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|
if (status == 0)
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return (-2);
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else
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return (status);
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}
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|
/*
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|
* Return codes for pcap_read() are:
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|
* - 0: timeout
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* - -1: error
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* - -2: loop was broken out of with pcap_breakloop()
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* - >1: OK
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* The first one ('0') conflicts with the return code of 0 from
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* pcap_offline_read() meaning "end of file".
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|
*/
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return (p->read_op(p, 1, pcap_fakecallback, (u_char *)&s));
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}
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|
/*
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|
* Force the loop in "pcap_read()" or "pcap_read_offline()" to terminate.
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|
*/
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|
void
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|
pcap_breakloop(pcap_t *p)
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|
{
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|
p->break_loop = 1;
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|
}
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|
|
|
int
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|
pcap_datalink(pcap_t *p)
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|
{
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|
return (p->linktype);
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|
}
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|
int
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|
pcap_list_datalinks(pcap_t *p, int **dlt_buffer)
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|
{
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|
if (p->dlt_count == 0) {
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/*
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|
* We couldn't fetch the list of DLTs, which means
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|
* this platform doesn't support changing the
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* DLT for an interface. Return a list of DLTs
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|
* containing only the DLT this device supports.
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|
*/
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*dlt_buffer = (int*)malloc(sizeof(**dlt_buffer));
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if (*dlt_buffer == NULL) {
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(void)snprintf(p->errbuf, sizeof(p->errbuf),
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"malloc: %s", pcap_strerror(errno));
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return (-1);
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}
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**dlt_buffer = p->linktype;
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return (1);
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} else {
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*dlt_buffer = (int*)calloc(sizeof(**dlt_buffer), p->dlt_count);
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if (*dlt_buffer == NULL) {
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(void)snprintf(p->errbuf, sizeof(p->errbuf),
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"malloc: %s", pcap_strerror(errno));
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return (-1);
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}
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(void)memcpy(*dlt_buffer, p->dlt_list,
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sizeof(**dlt_buffer) * p->dlt_count);
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return (p->dlt_count);
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}
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}
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|
int
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pcap_set_datalink(pcap_t *p, int dlt)
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{
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int i;
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const char *dlt_name;
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|
if (p->dlt_count == 0 || p->set_datalink_op == NULL) {
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/*
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|
* We couldn't fetch the list of DLTs, or we don't
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* have a "set datalink" operation, which means
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|
* this platform doesn't support changing the
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|
* DLT for an interface. Check whether the new
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* DLT is the one this interface supports.
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*/
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if (p->linktype != dlt)
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goto unsupported;
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/*
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* It is, so there's nothing we need to do here.
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*/
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return (0);
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}
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for (i = 0; i < p->dlt_count; i++)
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if (p->dlt_list[i] == dlt)
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break;
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if (i >= p->dlt_count)
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goto unsupported;
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if (p->dlt_count == 2 && p->dlt_list[0] == DLT_EN10MB &&
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dlt == DLT_DOCSIS) {
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|
/*
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|
* This is presumably an Ethernet device, as the first
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|
* link-layer type it offers is DLT_EN10MB, and the only
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|
* other type it offers is DLT_DOCSIS. That means that
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* we can't tell the driver to supply DOCSIS link-layer
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* headers - we're just pretending that's what we're
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* getting, as, presumably, we're capturing on a dedicated
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* link to a Cisco Cable Modem Termination System, and
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|
* it's putting raw DOCSIS frames on the wire inside low-level
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|
* Ethernet framing.
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|
*/
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p->linktype = dlt;
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|
return (0);
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|
}
|
|
if (p->set_datalink_op(p, dlt) == -1)
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|
return (-1);
|
|
p->linktype = dlt;
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|
return (0);
|
|
|
|
unsupported:
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|
dlt_name = pcap_datalink_val_to_name(dlt);
|
|
if (dlt_name != NULL) {
|
|
(void) snprintf(p->errbuf, sizeof(p->errbuf),
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|
"%s is not one of the DLTs supported by this device",
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|
dlt_name);
|
|
} else {
|
|
(void) snprintf(p->errbuf, sizeof(p->errbuf),
|
|
"DLT %d is not one of the DLTs supported by this device",
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|
dlt);
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|
}
|
|
return (-1);
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|
}
|
|
|
|
struct dlt_choice {
|
|
const char *name;
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|
const char *description;
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|
int dlt;
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|
};
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|
|
|
#define DLT_CHOICE(code, description) { #code, description, code }
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|
#define DLT_CHOICE_SENTINEL { NULL, NULL, 0 }
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|
|
|
static struct dlt_choice dlt_choices[] = {
|
|
DLT_CHOICE(DLT_NULL, "BSD loopback"),
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|
DLT_CHOICE(DLT_EN10MB, "Ethernet"),
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|
DLT_CHOICE(DLT_IEEE802, "Token ring"),
|
|
DLT_CHOICE(DLT_ARCNET, "ARCNET"),
|
|
DLT_CHOICE(DLT_SLIP, "SLIP"),
|
|
DLT_CHOICE(DLT_PPP, "PPP"),
|
|
DLT_CHOICE(DLT_FDDI, "FDDI"),
|
|
DLT_CHOICE(DLT_ATM_RFC1483, "RFC 1483 LLC-encapsulated ATM"),
|
|
DLT_CHOICE(DLT_RAW, "Raw IP"),
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|
DLT_CHOICE(DLT_SLIP_BSDOS, "BSD/OS SLIP"),
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|
DLT_CHOICE(DLT_PPP_BSDOS, "BSD/OS PPP"),
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|
DLT_CHOICE(DLT_ATM_CLIP, "Linux Classical IP-over-ATM"),
|
|
DLT_CHOICE(DLT_PPP_SERIAL, "PPP over serial"),
|
|
DLT_CHOICE(DLT_PPP_ETHER, "PPPoE"),
|
|
DLT_CHOICE(DLT_C_HDLC, "Cisco HDLC"),
|
|
DLT_CHOICE(DLT_IEEE802_11, "802.11"),
|
|
DLT_CHOICE(DLT_FRELAY, "Frame Relay"),
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|
DLT_CHOICE(DLT_LOOP, "OpenBSD loopback"),
|
|
DLT_CHOICE(DLT_ENC, "OpenBSD encapsulated IP"),
|
|
DLT_CHOICE(DLT_LINUX_SLL, "Linux cooked"),
|
|
DLT_CHOICE(DLT_LTALK, "Localtalk"),
|
|
DLT_CHOICE(DLT_PFLOG, "OpenBSD pflog file"),
|
|
DLT_CHOICE(DLT_PRISM_HEADER, "802.11 plus Prism header"),
|
|
DLT_CHOICE(DLT_IP_OVER_FC, "RFC 2625 IP-over-Fibre Channel"),
|
|
DLT_CHOICE(DLT_SUNATM, "Sun raw ATM"),
|
|
DLT_CHOICE(DLT_IEEE802_11_RADIO, "802.11 plus BSD radio information header"),
|
|
DLT_CHOICE(DLT_APPLE_IP_OVER_IEEE1394, "Apple IP-over-IEEE 1394"),
|
|
DLT_CHOICE(DLT_ARCNET_LINUX, "Linux ARCNET"),
|
|
DLT_CHOICE(DLT_DOCSIS, "DOCSIS"),
|
|
DLT_CHOICE(DLT_LINUX_IRDA, "Linux IrDA"),
|
|
DLT_CHOICE(DLT_LINUX_LAPD, "Linux vISDN LAPD"),
|
|
DLT_CHOICE(DLT_IEEE802_11_RADIO_AVS, "802.11 plus AVS radio information header"),
|
|
DLT_CHOICE(DLT_SYMANTEC_FIREWALL, "Symantec Firewall"),
|
|
DLT_CHOICE(DLT_JUNIPER_ATM1, "Juniper ATM1 PIC"),
|
|
DLT_CHOICE(DLT_JUNIPER_ATM2, "Juniper ATM2 PIC"),
|
|
DLT_CHOICE(DLT_JUNIPER_MLPPP, "Juniper Multi-Link PPP"),
|
|
DLT_CHOICE(DLT_PPP_PPPD, "PPP for pppd, with direction flag"),
|
|
DLT_CHOICE(DLT_JUNIPER_PPPOE, "Juniper PPPoE"),
|
|
DLT_CHOICE(DLT_JUNIPER_PPPOE_ATM, "Juniper PPPoE/ATM"),
|
|
DLT_CHOICE(DLT_GPRS_LLC, "GPRS LLC"),
|
|
DLT_CHOICE(DLT_GPF_T, "GPF-T"),
|
|
DLT_CHOICE(DLT_GPF_F, "GPF-F"),
|
|
DLT_CHOICE(DLT_JUNIPER_PIC_PEER, "Juniper PIC Peer"),
|
|
DLT_CHOICE(DLT_JUNIPER_MLFR, "Juniper Multi-Link Frame Relay"),
|
|
DLT_CHOICE(DLT_ERF_ETH, "Ethernet with Endace ERF header"),
|
|
DLT_CHOICE(DLT_ERF_POS, "Packet-over-SONET with Endace ERF header"),
|
|
DLT_CHOICE(DLT_JUNIPER_GGSN, "Juniper GGSN PIC"),
|
|
DLT_CHOICE(DLT_JUNIPER_ES, "Juniper Encryption Services PIC"),
|
|
DLT_CHOICE(DLT_JUNIPER_MONITOR, "Juniper Passive Monitor PIC"),
|
|
DLT_CHOICE(DLT_JUNIPER_SERVICES, "Juniper Advanced Services PIC"),
|
|
DLT_CHOICE(DLT_JUNIPER_MFR, "Juniper FRF.16 Frame Relay"),
|
|
DLT_CHOICE(DLT_JUNIPER_ETHER, "Juniper Ethernet"),
|
|
DLT_CHOICE(DLT_JUNIPER_PPP, "Juniper PPP"),
|
|
DLT_CHOICE(DLT_JUNIPER_FRELAY, "Juniper Frame Relay"),
|
|
DLT_CHOICE(DLT_JUNIPER_CHDLC, "Juniper C-HDLC"),
|
|
DLT_CHOICE(DLT_MFR, "FRF.16 Frame Relay"),
|
|
DLT_CHOICE(DLT_JUNIPER_VP, "Juniper Voice PIC"),
|
|
DLT_CHOICE(DLT_MTP2, "SS7 MTP2"),
|
|
DLT_CHOICE(DLT_A429, "Arinc 429"),
|
|
DLT_CHOICE(DLT_A653_ICM, "Arinc 653 Interpartition Communication"),
|
|
DLT_CHOICE(DLT_USB, "USB"),
|
|
DLT_CHOICE(DLT_BLUETOOTH_HCI_H4, "Bluetooth HCI UART transport layer"),
|
|
DLT_CHOICE(DLT_CAN20B, "Controller Area Network (CAN) v. 2.0B"),
|
|
DLT_CHOICE(DLT_MTP2_WITH_PHDR, "SS7 MTP2 with Pseudo-header"),
|
|
DLT_CHOICE_SENTINEL
|
|
};
|
|
|
|
/*
|
|
* This array is designed for mapping upper and lower case letter
|
|
* together for a case independent comparison. The mappings are
|
|
* based upon ascii character sequences.
|
|
*/
|
|
static const u_char charmap[] = {
|
|
(u_char)'\000', (u_char)'\001', (u_char)'\002', (u_char)'\003',
|
|
(u_char)'\004', (u_char)'\005', (u_char)'\006', (u_char)'\007',
|
|
(u_char)'\010', (u_char)'\011', (u_char)'\012', (u_char)'\013',
|
|
(u_char)'\014', (u_char)'\015', (u_char)'\016', (u_char)'\017',
|
|
(u_char)'\020', (u_char)'\021', (u_char)'\022', (u_char)'\023',
|
|
(u_char)'\024', (u_char)'\025', (u_char)'\026', (u_char)'\027',
|
|
(u_char)'\030', (u_char)'\031', (u_char)'\032', (u_char)'\033',
|
|
(u_char)'\034', (u_char)'\035', (u_char)'\036', (u_char)'\037',
|
|
(u_char)'\040', (u_char)'\041', (u_char)'\042', (u_char)'\043',
|
|
(u_char)'\044', (u_char)'\045', (u_char)'\046', (u_char)'\047',
|
|
(u_char)'\050', (u_char)'\051', (u_char)'\052', (u_char)'\053',
|
|
(u_char)'\054', (u_char)'\055', (u_char)'\056', (u_char)'\057',
|
|
(u_char)'\060', (u_char)'\061', (u_char)'\062', (u_char)'\063',
|
|
(u_char)'\064', (u_char)'\065', (u_char)'\066', (u_char)'\067',
|
|
(u_char)'\070', (u_char)'\071', (u_char)'\072', (u_char)'\073',
|
|
(u_char)'\074', (u_char)'\075', (u_char)'\076', (u_char)'\077',
|
|
(u_char)'\100', (u_char)'\141', (u_char)'\142', (u_char)'\143',
|
|
(u_char)'\144', (u_char)'\145', (u_char)'\146', (u_char)'\147',
|
|
(u_char)'\150', (u_char)'\151', (u_char)'\152', (u_char)'\153',
|
|
(u_char)'\154', (u_char)'\155', (u_char)'\156', (u_char)'\157',
|
|
(u_char)'\160', (u_char)'\161', (u_char)'\162', (u_char)'\163',
|
|
(u_char)'\164', (u_char)'\165', (u_char)'\166', (u_char)'\167',
|
|
(u_char)'\170', (u_char)'\171', (u_char)'\172', (u_char)'\133',
|
|
(u_char)'\134', (u_char)'\135', (u_char)'\136', (u_char)'\137',
|
|
(u_char)'\140', (u_char)'\141', (u_char)'\142', (u_char)'\143',
|
|
(u_char)'\144', (u_char)'\145', (u_char)'\146', (u_char)'\147',
|
|
(u_char)'\150', (u_char)'\151', (u_char)'\152', (u_char)'\153',
|
|
(u_char)'\154', (u_char)'\155', (u_char)'\156', (u_char)'\157',
|
|
(u_char)'\160', (u_char)'\161', (u_char)'\162', (u_char)'\163',
|
|
(u_char)'\164', (u_char)'\165', (u_char)'\166', (u_char)'\167',
|
|
(u_char)'\170', (u_char)'\171', (u_char)'\172', (u_char)'\173',
|
|
(u_char)'\174', (u_char)'\175', (u_char)'\176', (u_char)'\177',
|
|
(u_char)'\200', (u_char)'\201', (u_char)'\202', (u_char)'\203',
|
|
(u_char)'\204', (u_char)'\205', (u_char)'\206', (u_char)'\207',
|
|
(u_char)'\210', (u_char)'\211', (u_char)'\212', (u_char)'\213',
|
|
(u_char)'\214', (u_char)'\215', (u_char)'\216', (u_char)'\217',
|
|
(u_char)'\220', (u_char)'\221', (u_char)'\222', (u_char)'\223',
|
|
(u_char)'\224', (u_char)'\225', (u_char)'\226', (u_char)'\227',
|
|
(u_char)'\230', (u_char)'\231', (u_char)'\232', (u_char)'\233',
|
|
(u_char)'\234', (u_char)'\235', (u_char)'\236', (u_char)'\237',
|
|
(u_char)'\240', (u_char)'\241', (u_char)'\242', (u_char)'\243',
|
|
(u_char)'\244', (u_char)'\245', (u_char)'\246', (u_char)'\247',
|
|
(u_char)'\250', (u_char)'\251', (u_char)'\252', (u_char)'\253',
|
|
(u_char)'\254', (u_char)'\255', (u_char)'\256', (u_char)'\257',
|
|
(u_char)'\260', (u_char)'\261', (u_char)'\262', (u_char)'\263',
|
|
(u_char)'\264', (u_char)'\265', (u_char)'\266', (u_char)'\267',
|
|
(u_char)'\270', (u_char)'\271', (u_char)'\272', (u_char)'\273',
|
|
(u_char)'\274', (u_char)'\275', (u_char)'\276', (u_char)'\277',
|
|
(u_char)'\300', (u_char)'\341', (u_char)'\342', (u_char)'\343',
|
|
(u_char)'\344', (u_char)'\345', (u_char)'\346', (u_char)'\347',
|
|
(u_char)'\350', (u_char)'\351', (u_char)'\352', (u_char)'\353',
|
|
(u_char)'\354', (u_char)'\355', (u_char)'\356', (u_char)'\357',
|
|
(u_char)'\360', (u_char)'\361', (u_char)'\362', (u_char)'\363',
|
|
(u_char)'\364', (u_char)'\365', (u_char)'\366', (u_char)'\367',
|
|
(u_char)'\370', (u_char)'\371', (u_char)'\372', (u_char)'\333',
|
|
(u_char)'\334', (u_char)'\335', (u_char)'\336', (u_char)'\337',
|
|
(u_char)'\340', (u_char)'\341', (u_char)'\342', (u_char)'\343',
|
|
(u_char)'\344', (u_char)'\345', (u_char)'\346', (u_char)'\347',
|
|
(u_char)'\350', (u_char)'\351', (u_char)'\352', (u_char)'\353',
|
|
(u_char)'\354', (u_char)'\355', (u_char)'\356', (u_char)'\357',
|
|
(u_char)'\360', (u_char)'\361', (u_char)'\362', (u_char)'\363',
|
|
(u_char)'\364', (u_char)'\365', (u_char)'\366', (u_char)'\367',
|
|
(u_char)'\370', (u_char)'\371', (u_char)'\372', (u_char)'\373',
|
|
(u_char)'\374', (u_char)'\375', (u_char)'\376', (u_char)'\377',
|
|
};
|
|
|
|
int
|
|
pcap_strcasecmp(const char *s1, const char *s2)
|
|
{
|
|
register const u_char *cm = charmap,
|
|
*us1 = (const u_char *)s1,
|
|
*us2 = (const u_char *)s2;
|
|
|
|
while (cm[*us1] == cm[*us2++])
|
|
if (*us1++ == '\0')
|
|
return(0);
|
|
return (cm[*us1] - cm[*--us2]);
|
|
}
|
|
|
|
int
|
|
pcap_datalink_name_to_val(const char *name)
|
|
{
|
|
int i;
|
|
|
|
for (i = 0; dlt_choices[i].name != NULL; i++) {
|
|
if (pcap_strcasecmp(dlt_choices[i].name + sizeof("DLT_") - 1,
|
|
name) == 0)
|
|
return (dlt_choices[i].dlt);
|
|
}
|
|
return (-1);
|
|
}
|
|
|
|
const char *
|
|
pcap_datalink_val_to_name(int dlt)
|
|
{
|
|
int i;
|
|
|
|
for (i = 0; dlt_choices[i].name != NULL; i++) {
|
|
if (dlt_choices[i].dlt == dlt)
|
|
return (dlt_choices[i].name + sizeof("DLT_") - 1);
|
|
}
|
|
return (NULL);
|
|
}
|
|
|
|
const char *
|
|
pcap_datalink_val_to_description(int dlt)
|
|
{
|
|
int i;
|
|
|
|
for (i = 0; dlt_choices[i].name != NULL; i++) {
|
|
if (dlt_choices[i].dlt == dlt)
|
|
return (dlt_choices[i].description);
|
|
}
|
|
return (NULL);
|
|
}
|
|
|
|
int
|
|
pcap_snapshot(pcap_t *p)
|
|
{
|
|
return (p->snapshot);
|
|
}
|
|
|
|
int
|
|
pcap_is_swapped(pcap_t *p)
|
|
{
|
|
return (p->sf.swapped);
|
|
}
|
|
|
|
int
|
|
pcap_major_version(pcap_t *p)
|
|
{
|
|
return (p->sf.version_major);
|
|
}
|
|
|
|
int
|
|
pcap_minor_version(pcap_t *p)
|
|
{
|
|
return (p->sf.version_minor);
|
|
}
|
|
|
|
FILE *
|
|
pcap_file(pcap_t *p)
|
|
{
|
|
return (p->sf.rfile);
|
|
}
|
|
|
|
int
|
|
pcap_fileno(pcap_t *p)
|
|
{
|
|
#ifndef WIN32
|
|
return (p->fd);
|
|
#else
|
|
if (p->adapter != NULL)
|
|
return ((int)(DWORD)p->adapter->hFile);
|
|
else
|
|
return (-1);
|
|
#endif
|
|
}
|
|
|
|
#if !defined(WIN32) && !defined(MSDOS)
|
|
int
|
|
pcap_get_selectable_fd(pcap_t *p)
|
|
{
|
|
return (p->selectable_fd);
|
|
}
|
|
#endif
|
|
|
|
void
|
|
pcap_perror(pcap_t *p, char *prefix)
|
|
{
|
|
fprintf(stderr, "%s: %s\n", prefix, p->errbuf);
|
|
}
|
|
|
|
char *
|
|
pcap_geterr(pcap_t *p)
|
|
{
|
|
return (p->errbuf);
|
|
}
|
|
|
|
int
|
|
pcap_getnonblock(pcap_t *p, char *errbuf)
|
|
{
|
|
return p->getnonblock_op(p, errbuf);
|
|
}
|
|
|
|
/*
|
|
* Get the current non-blocking mode setting, under the assumption that
|
|
* it's just the standard POSIX non-blocking flag.
|
|
*
|
|
* We don't look at "p->nonblock", in case somebody tweaked the FD
|
|
* directly.
|
|
*/
|
|
#if !defined(WIN32) && !defined(MSDOS)
|
|
int
|
|
pcap_getnonblock_fd(pcap_t *p, char *errbuf)
|
|
{
|
|
int fdflags;
|
|
|
|
fdflags = fcntl(p->fd, F_GETFL, 0);
|
|
if (fdflags == -1) {
|
|
snprintf(p->errbuf, PCAP_ERRBUF_SIZE, "F_GETFL: %s",
|
|
pcap_strerror(errno));
|
|
return (-1);
|
|
}
|
|
if (fdflags & O_NONBLOCK)
|
|
return (1);
|
|
else
|
|
return (0);
|
|
}
|
|
#endif
|
|
|
|
int
|
|
pcap_setnonblock(pcap_t *p, int nonblock, char *errbuf)
|
|
{
|
|
return p->setnonblock_op(p, nonblock, errbuf);
|
|
}
|
|
|
|
#if !defined(WIN32) && !defined(MSDOS)
|
|
/*
|
|
* Set non-blocking mode, under the assumption that it's just the
|
|
* standard POSIX non-blocking flag. (This can be called by the
|
|
* per-platform non-blocking-mode routine if that routine also
|
|
* needs to do some additional work.)
|
|
*/
|
|
int
|
|
pcap_setnonblock_fd(pcap_t *p, int nonblock, char *errbuf)
|
|
{
|
|
int fdflags;
|
|
|
|
fdflags = fcntl(p->fd, F_GETFL, 0);
|
|
if (fdflags == -1) {
|
|
snprintf(p->errbuf, PCAP_ERRBUF_SIZE, "F_GETFL: %s",
|
|
pcap_strerror(errno));
|
|
return (-1);
|
|
}
|
|
if (nonblock)
|
|
fdflags |= O_NONBLOCK;
|
|
else
|
|
fdflags &= ~O_NONBLOCK;
|
|
if (fcntl(p->fd, F_SETFL, fdflags) == -1) {
|
|
snprintf(p->errbuf, PCAP_ERRBUF_SIZE, "F_SETFL: %s",
|
|
pcap_strerror(errno));
|
|
return (-1);
|
|
}
|
|
return (0);
|
|
}
|
|
#endif
|
|
|
|
#ifdef WIN32
|
|
/*
|
|
* Generate a string for the last Win32-specific error (i.e. an error generated when
|
|
* calling a Win32 API).
|
|
* For errors occurred during standard C calls, we still use pcap_strerror()
|
|
*/
|
|
char *
|
|
pcap_win32strerror(void)
|
|
{
|
|
DWORD error;
|
|
static char errbuf[PCAP_ERRBUF_SIZE+1];
|
|
int errlen;
|
|
char *p;
|
|
|
|
error = GetLastError();
|
|
FormatMessage(FORMAT_MESSAGE_FROM_SYSTEM, NULL, error, 0, errbuf,
|
|
PCAP_ERRBUF_SIZE, NULL);
|
|
|
|
/*
|
|
* "FormatMessage()" "helpfully" sticks CR/LF at the end of the
|
|
* message. Get rid of it.
|
|
*/
|
|
errlen = strlen(errbuf);
|
|
if (errlen >= 2) {
|
|
errbuf[errlen - 1] = '\0';
|
|
errbuf[errlen - 2] = '\0';
|
|
}
|
|
p = strchr(errbuf, '\0');
|
|
snprintf (p, sizeof(errbuf)-(p-errbuf), " (%lu)", error);
|
|
return (errbuf);
|
|
}
|
|
#endif
|
|
|
|
/*
|
|
* Not all systems have strerror().
|
|
*/
|
|
const char *
|
|
pcap_strerror(int errnum)
|
|
{
|
|
#ifdef HAVE_STRERROR
|
|
return (strerror(errnum));
|
|
#else
|
|
extern int sys_nerr;
|
|
extern const char *const sys_errlist[];
|
|
static char ebuf[20];
|
|
|
|
if ((unsigned int)errnum < sys_nerr)
|
|
return ((char *)sys_errlist[errnum]);
|
|
(void)snprintf(ebuf, sizeof ebuf, "Unknown error: %d", errnum);
|
|
return(ebuf);
|
|
#endif
|
|
}
|
|
|
|
int
|
|
pcap_setfilter(pcap_t *p, struct bpf_program *fp)
|
|
{
|
|
return p->setfilter_op(p, fp);
|
|
}
|
|
|
|
/*
|
|
* Set direction flag, which controls whether we accept only incoming
|
|
* packets, only outgoing packets, or both.
|
|
* Note that, depending on the platform, some or all direction arguments
|
|
* might not be supported.
|
|
*/
|
|
int
|
|
pcap_setdirection(pcap_t *p, pcap_direction_t d)
|
|
{
|
|
if (p->setdirection_op == NULL) {
|
|
snprintf(p->errbuf, PCAP_ERRBUF_SIZE,
|
|
"Setting direction is not implemented on this platform");
|
|
return -1;
|
|
} else
|
|
return p->setdirection_op(p, d);
|
|
}
|
|
|
|
int
|
|
pcap_stats(pcap_t *p, struct pcap_stat *ps)
|
|
{
|
|
return p->stats_op(p, ps);
|
|
}
|
|
|
|
static int
|
|
pcap_stats_dead(pcap_t *p, struct pcap_stat *ps _U_)
|
|
{
|
|
snprintf(p->errbuf, PCAP_ERRBUF_SIZE,
|
|
"Statistics aren't available from a pcap_open_dead pcap_t");
|
|
return (-1);
|
|
}
|
|
|
|
void
|
|
pcap_close_common(pcap_t *p)
|
|
{
|
|
#ifdef BIOCSETBUFMODE
|
|
/*
|
|
* Check to see if this pcap instance was using the zerocopy buffer
|
|
* mode. If it was, delete the mappings. Note that p->buffer
|
|
* gets initialized to one of the mmaped regions in this case, so
|
|
* do not try and free it directly.
|
|
*
|
|
* If the regular buffer mode was selected, then it is safe to free
|
|
* this memory.
|
|
*/
|
|
if (p->zerocopy) {
|
|
if (p->zbuf1 != MAP_FAILED && p->zbuf1 != NULL)
|
|
munmap(p->zbuf1, p->zbufsize);
|
|
if (p->zbuf2 != MAP_FAILED && p->zbuf2 != NULL)
|
|
munmap(p->zbuf2, p->zbufsize);
|
|
p->buffer = NULL;
|
|
} else
|
|
#endif
|
|
if (p->buffer != NULL)
|
|
free(p->buffer);
|
|
#if !defined(WIN32) && !defined(MSDOS)
|
|
if (p->fd >= 0)
|
|
close(p->fd);
|
|
#endif
|
|
}
|
|
|
|
static void
|
|
pcap_close_dead(pcap_t *p _U_)
|
|
{
|
|
/* Nothing to do. */
|
|
}
|
|
|
|
pcap_t *
|
|
pcap_open_dead(int linktype, int snaplen)
|
|
{
|
|
pcap_t *p;
|
|
|
|
p = malloc(sizeof(*p));
|
|
if (p == NULL)
|
|
return NULL;
|
|
memset (p, 0, sizeof(*p));
|
|
p->snapshot = snaplen;
|
|
p->linktype = linktype;
|
|
p->stats_op = pcap_stats_dead;
|
|
p->close_op = pcap_close_dead;
|
|
return p;
|
|
}
|
|
|
|
/*
|
|
* API compatible with WinPcap's "send a packet" routine - returns -1
|
|
* on error, 0 otherwise.
|
|
*
|
|
* XXX - what if we get a short write?
|
|
*/
|
|
int
|
|
pcap_sendpacket(pcap_t *p, const u_char *buf, int size)
|
|
{
|
|
if (p->inject_op(p, buf, size) == -1)
|
|
return (-1);
|
|
return (0);
|
|
}
|
|
|
|
/*
|
|
* API compatible with OpenBSD's "send a packet" routine - returns -1 on
|
|
* error, number of bytes written otherwise.
|
|
*/
|
|
int
|
|
pcap_inject(pcap_t *p, const void *buf, size_t size)
|
|
{
|
|
return (p->inject_op(p, buf, size));
|
|
}
|
|
|
|
void
|
|
pcap_close(pcap_t *p)
|
|
{
|
|
p->close_op(p);
|
|
if (p->dlt_list != NULL)
|
|
free(p->dlt_list);
|
|
pcap_freecode(&p->fcode);
|
|
free(p);
|
|
}
|
|
|
|
/*
|
|
* We make the version string static, and return a pointer to it, rather
|
|
* than exporting the version string directly. On at least some UNIXes,
|
|
* if you import data from a shared library into an program, the data is
|
|
* bound into the program binary, so if the string in the version of the
|
|
* library with which the program was linked isn't the same as the
|
|
* string in the version of the library with which the program is being
|
|
* run, various undesirable things may happen (warnings, the string
|
|
* being the one from the version of the library with which the program
|
|
* was linked, or even weirder things, such as the string being the one
|
|
* from the library but being truncated).
|
|
*/
|
|
#ifdef HAVE_VERSION_H
|
|
#include "version.h"
|
|
#else
|
|
static const char pcap_version_string[] = "libpcap version 0.9.8";
|
|
#endif
|
|
|
|
#ifdef WIN32
|
|
/*
|
|
* XXX - it'd be nice if we could somehow generate the WinPcap and libpcap
|
|
* version numbers when building WinPcap. (It'd be nice to do so for
|
|
* the packet.dll version number as well.)
|
|
*/
|
|
static const char wpcap_version_string[] = "4.0";
|
|
static const char pcap_version_string_fmt[] =
|
|
"WinPcap version %s, based on %s";
|
|
static const char pcap_version_string_packet_dll_fmt[] =
|
|
"WinPcap version %s (packet.dll version %s), based on %s";
|
|
static char *full_pcap_version_string;
|
|
|
|
const char *
|
|
pcap_lib_version(void)
|
|
{
|
|
char *packet_version_string;
|
|
size_t full_pcap_version_string_len;
|
|
|
|
if (full_pcap_version_string == NULL) {
|
|
/*
|
|
* Generate the version string.
|
|
*/
|
|
packet_version_string = PacketGetVersion();
|
|
if (strcmp(wpcap_version_string, packet_version_string) == 0) {
|
|
/*
|
|
* WinPcap version string and packet.dll version
|
|
* string are the same; just report the WinPcap
|
|
* version.
|
|
*/
|
|
full_pcap_version_string_len =
|
|
(sizeof pcap_version_string_fmt - 4) +
|
|
strlen(wpcap_version_string) +
|
|
strlen(pcap_version_string);
|
|
full_pcap_version_string =
|
|
malloc(full_pcap_version_string_len);
|
|
sprintf(full_pcap_version_string,
|
|
pcap_version_string_fmt, wpcap_version_string,
|
|
pcap_version_string);
|
|
} else {
|
|
/*
|
|
* WinPcap version string and packet.dll version
|
|
* string are different; that shouldn't be the
|
|
* case (the two libraries should come from the
|
|
* same version of WinPcap), so we report both
|
|
* versions.
|
|
*/
|
|
full_pcap_version_string_len =
|
|
(sizeof pcap_version_string_packet_dll_fmt - 6) +
|
|
strlen(wpcap_version_string) +
|
|
strlen(packet_version_string) +
|
|
strlen(pcap_version_string);
|
|
full_pcap_version_string = malloc(full_pcap_version_string_len);
|
|
|
|
sprintf(full_pcap_version_string,
|
|
pcap_version_string_packet_dll_fmt,
|
|
wpcap_version_string, packet_version_string,
|
|
pcap_version_string);
|
|
}
|
|
}
|
|
return (full_pcap_version_string);
|
|
}
|
|
|
|
#elif defined(MSDOS)
|
|
|
|
static char *full_pcap_version_string;
|
|
|
|
const char *
|
|
pcap_lib_version (void)
|
|
{
|
|
char *packet_version_string;
|
|
size_t full_pcap_version_string_len;
|
|
static char dospfx[] = "DOS-";
|
|
|
|
if (full_pcap_version_string == NULL) {
|
|
/*
|
|
* Generate the version string.
|
|
*/
|
|
full_pcap_version_string_len =
|
|
sizeof dospfx + strlen(pcap_version_string);
|
|
full_pcap_version_string =
|
|
malloc(full_pcap_version_string_len);
|
|
strcpy(full_pcap_version_string, dospfx);
|
|
strcat(full_pcap_version_string, pcap_version_string);
|
|
}
|
|
return (full_pcap_version_string);
|
|
}
|
|
|
|
#else /* UN*X */
|
|
|
|
const char *
|
|
pcap_lib_version(void)
|
|
{
|
|
return (pcap_version_string);
|
|
}
|
|
#endif
|