395 lines
9.2 KiB
C
395 lines
9.2 KiB
C
/*
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* Copyright (c) 1993, 1994, 1995, 1996, 1997
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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: (1) source code distributions
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* retain the above copyright notice and this paragraph in its entirety, (2)
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* distributions including binary code include the above copyright notice and
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* this paragraph in its entirety in the documentation or other materials
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* provided with the distribution, and (3) all advertising materials mentioning
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* features or use of this software display the following acknowledgement:
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* ``This product includes software developed by the University of California,
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* Lawrence Berkeley Laboratory and its contributors.'' Neither the name of
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* the University nor the names of its contributors may be used to endorse
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* or promote products derived from this software without specific prior
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* written permission.
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* THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR IMPLIED
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* WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED WARRANTIES OF
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* MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.
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*
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* savefile.c - supports offline use of tcpdump
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* Extraction/creation by Jeffrey Mogul, DECWRL
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* Modified by Steve McCanne, LBL.
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*
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* Used to save the received packet headers, after filtering, to
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* a file, and then read them later.
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* The first record in the file contains saved values for the machine
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* dependent values so we can print the dump file on any architecture.
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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/savefile.c,v 1.183 2008-12-23 20:13:29 guy Exp $ (LBL)";
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#endif
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#ifdef HAVE_CONFIG_H
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#include "config.h"
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#endif
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#ifdef WIN32
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#include <pcap-stdinc.h>
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#else /* WIN32 */
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#if HAVE_INTTYPES_H
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#include <inttypes.h>
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#elif HAVE_STDINT_H
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#include <stdint.h>
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#endif
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#ifdef HAVE_SYS_BITYPES_H
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#include <sys/bitypes.h>
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#endif
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#include <sys/types.h>
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#endif /* WIN32 */
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#include <errno.h>
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#include <memory.h>
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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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#include "pcap-int.h"
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#include "pcap/usb.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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#include "sf-pcap.h"
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#include "sf-pcap-ng.h"
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/*
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* Setting O_BINARY on DOS/Windows is a bit tricky
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*/
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#if defined(WIN32)
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#define SET_BINMODE(f) _setmode(_fileno(f), _O_BINARY)
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#elif defined(MSDOS)
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#if defined(__HIGHC__)
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#define SET_BINMODE(f) setmode(f, O_BINARY)
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#else
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#define SET_BINMODE(f) setmode(fileno(f), O_BINARY)
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#endif
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#endif
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static int
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sf_getnonblock(pcap_t *p, char *errbuf)
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{
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/*
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* This is a savefile, not a live capture file, so never say
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* it's in non-blocking mode.
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*/
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return (0);
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}
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static int
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sf_setnonblock(pcap_t *p, int nonblock, char *errbuf)
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{
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/*
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* This is a savefile, not a live capture file, so reject
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* requests to put it in non-blocking mode. (If it's a
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* pipe, it could be put in non-blocking mode, but that
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* would significantly complicate the code to read packets,
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* as it would have to handle reading partial packets and
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* keeping the state of the read.)
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*/
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snprintf(p->errbuf, PCAP_ERRBUF_SIZE,
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"Savefiles cannot be put into non-blocking mode");
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return (-1);
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}
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static int
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sf_stats(pcap_t *p, struct pcap_stat *ps)
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{
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snprintf(p->errbuf, PCAP_ERRBUF_SIZE,
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"Statistics aren't available from savefiles");
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return (-1);
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}
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#ifdef WIN32
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static int
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sf_setbuff(pcap_t *p, int dim)
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{
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snprintf(p->errbuf, PCAP_ERRBUF_SIZE,
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"The kernel buffer size cannot be set while reading from a file");
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return (-1);
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}
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static int
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sf_setmode(pcap_t *p, int mode)
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{
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snprintf(p->errbuf, PCAP_ERRBUF_SIZE,
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"impossible to set mode while reading from a file");
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return (-1);
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}
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static int
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sf_setmintocopy(pcap_t *p, int size)
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{
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snprintf(p->errbuf, PCAP_ERRBUF_SIZE,
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"The mintocopy parameter cannot be set while reading from a file");
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return (-1);
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}
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#endif
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static int
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sf_inject(pcap_t *p, const void *buf _U_, size_t size _U_)
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{
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strlcpy(p->errbuf, "Sending packets isn't supported on savefiles",
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PCAP_ERRBUF_SIZE);
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return (-1);
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}
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/*
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* Set direction flag: Which packets do we accept on a forwarding
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* single device? IN, OUT or both?
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*/
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static int
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sf_setdirection(pcap_t *p, pcap_direction_t d)
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{
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snprintf(p->errbuf, sizeof(p->errbuf),
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"Setting direction is not supported on savefiles");
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return (-1);
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}
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static void
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sf_cleanup(pcap_t *p)
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{
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if (p->sf.rfile != stdin)
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(void)fclose(p->sf.rfile);
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if (p->buffer != NULL)
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free(p->buffer);
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pcap_freecode(&p->fcode);
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}
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pcap_t *
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pcap_open_offline(const char *fname, char *errbuf)
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{
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FILE *fp;
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pcap_t *p;
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if (fname[0] == '-' && fname[1] == '\0')
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{
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fp = stdin;
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#if defined(WIN32) || defined(MSDOS)
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/*
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* We're reading from the standard input, so put it in binary
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* mode, as savefiles are binary files.
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*/
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SET_BINMODE(fp);
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#endif
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}
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else {
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#if !defined(WIN32) && !defined(MSDOS)
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fp = fopen(fname, "r");
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#else
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fp = fopen(fname, "rb");
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#endif
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if (fp == NULL) {
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snprintf(errbuf, PCAP_ERRBUF_SIZE, "%s: %s", fname,
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pcap_strerror(errno));
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return (NULL);
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}
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}
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p = pcap_fopen_offline(fp, errbuf);
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if (p == NULL) {
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if (fp != stdin)
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fclose(fp);
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}
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return (p);
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}
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#ifdef WIN32
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pcap_t* pcap_hopen_offline(intptr_t osfd, char *errbuf)
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{
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int fd;
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FILE *file;
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fd = _open_osfhandle(osfd, _O_RDONLY);
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if ( fd < 0 )
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{
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snprintf(errbuf, PCAP_ERRBUF_SIZE, pcap_strerror(errno));
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return NULL;
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}
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file = _fdopen(fd, "rb");
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if ( file == NULL )
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{
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snprintf(errbuf, PCAP_ERRBUF_SIZE, pcap_strerror(errno));
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return NULL;
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}
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return pcap_fopen_offline(file, errbuf);
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}
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#endif
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static int (*check_headers[])(pcap_t *, bpf_u_int32, FILE *, char *) = {
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pcap_check_header,
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pcap_ng_check_header
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};
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#define N_FILE_TYPES (sizeof check_headers / sizeof check_headers[0])
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#ifdef WIN32
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static
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#endif
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pcap_t *
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pcap_fopen_offline(FILE *fp, char *errbuf)
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{
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register pcap_t *p;
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bpf_u_int32 magic;
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size_t amt_read;
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u_int i;
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p = pcap_create_common("(savefile)", errbuf);
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if (p == NULL)
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return (NULL);
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/*
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* Read the first 4 bytes of the file; the network analyzer dump
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* file formats we support (pcap and pcap-ng), and several other
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* formats we might support in the future (such as snoop, DOS and
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* Windows Sniffer, and Microsoft Network Monitor) all have magic
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* numbers that are unique in their first 4 bytes.
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*/
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amt_read = fread((char *)&magic, 1, sizeof(magic), fp);
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if (amt_read != sizeof(magic)) {
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if (ferror(fp)) {
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snprintf(errbuf, PCAP_ERRBUF_SIZE,
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"error reading dump file: %s",
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pcap_strerror(errno));
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} else {
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snprintf(errbuf, PCAP_ERRBUF_SIZE,
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"truncated dump file; tried to read %lu file header bytes, only got %lu",
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(unsigned long)sizeof(magic),
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(unsigned long)amt_read);
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}
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goto bad;
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}
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/*
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* Try all file types.
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*/
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for (i = 0; i < N_FILE_TYPES; i++) {
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switch ((*check_headers[i])(p, magic, fp, errbuf)) {
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case -1:
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/*
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* Error trying to read the header.
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*/
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goto bad;
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case 1:
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/*
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* Yup, that's it.
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*/
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goto found;
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}
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}
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/*
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* Well, who knows what this mess is....
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*/
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snprintf(errbuf, PCAP_ERRBUF_SIZE, "unknown file format");
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goto bad;
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found:
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p->sf.rfile = fp;
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#ifdef PCAP_FDDIPAD
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/* Padding only needed for live capture fcode */
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p->fddipad = 0;
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#endif
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#if !defined(WIN32) && !defined(MSDOS)
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/*
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* You can do "select()" and "poll()" on plain files on most
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* platforms, and should be able to do so on pipes.
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*
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* You can't do "select()" on anything other than sockets in
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* Windows, so, on Win32 systems, we don't have "selectable_fd".
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*/
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p->selectable_fd = fileno(fp);
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#endif
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p->read_op = pcap_offline_read;
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p->inject_op = sf_inject;
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p->setfilter_op = install_bpf_program;
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p->setdirection_op = sf_setdirection;
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p->set_datalink_op = NULL; /* we don't support munging link-layer headers */
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p->getnonblock_op = sf_getnonblock;
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p->setnonblock_op = sf_setnonblock;
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p->stats_op = sf_stats;
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#ifdef WIN32
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p->setbuff_op = sf_setbuff;
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p->setmode_op = sf_setmode;
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p->setmintocopy_op = sf_setmintocopy;
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#endif
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p->cleanup_op = sf_cleanup;
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p->activated = 1;
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return (p);
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bad:
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free(p);
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return (NULL);
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}
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/*
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* Read packets from a capture file, and call the callback for each
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* packet.
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* If cnt > 0, return after 'cnt' packets, otherwise continue until eof.
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*/
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int
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pcap_offline_read(pcap_t *p, int cnt, pcap_handler callback, u_char *user)
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{
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struct bpf_insn *fcode;
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int status = 0;
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int n = 0;
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u_char *data;
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while (status == 0) {
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struct pcap_pkthdr h;
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/*
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* Has "pcap_breakloop()" been called?
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* If so, return immediately - if we haven't read any
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* packets, clear the flag and return -2 to indicate
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* that we were told to break out of the loop, otherwise
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* leave the flag set, so that the *next* call will break
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* out of the loop without having read any packets, and
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* return the number of packets we've processed so far.
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*/
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if (p->break_loop) {
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if (n == 0) {
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p->break_loop = 0;
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return (-2);
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} else
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return (n);
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}
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status = p->sf.next_packet_op(p, &h, &data);
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if (status) {
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if (status == 1)
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return (0);
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return (status);
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}
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if ((fcode = p->fcode.bf_insns) == NULL ||
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bpf_filter(fcode, data, h.len, h.caplen)) {
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(*callback)(user, &h, data);
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if (++n >= cnt && cnt > 0)
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break;
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}
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}
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/*XXX this breaks semantics tcpslice expects */
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return (n);
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}
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