699 lines
18 KiB
C
699 lines
18 KiB
C
/* file.c
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*
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* $Id: file.c,v 1.96 2002/07/31 19:27:57 guy Exp $
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*
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* Wiretap Library
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* Copyright (c) 1998 by Gilbert Ramirez <gram@alumni.rice.edu>
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* as published by the Free Software Foundation; either version 2
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* of the License, or (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
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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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#include <stdio.h>
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#include <string.h>
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#include <stdlib.h>
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#ifdef HAVE_FCNTL_H
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#include <fcntl.h>
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#endif
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#ifdef HAVE_SYS_STAT_H
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#include <sys/stat.h>
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#endif
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#ifdef HAVE_UNISTD_H
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#include <unistd.h>
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#endif
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#include <errno.h>
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#ifdef HAVE_IO_H
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#include <io.h> /* open/close on win32 */
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#endif
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#include "wtap-int.h"
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#include "file_wrappers.h"
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#include "buffer.h"
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#include "lanalyzer.h"
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#include "ngsniffer.h"
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#include "radcom.h"
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#include "ascend.h"
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#include "nettl.h"
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#include "libpcap.h"
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#include "snoop.h"
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#include "iptrace.h"
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#include "netmon.h"
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#include "netxray.h"
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#include "toshiba.h"
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#include "i4btrace.h"
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#include "csids.h"
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#include "pppdump.h"
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#include "etherpeek.h"
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#include "vms.h"
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#include "dbs-etherwatch.h"
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#include "visual.h"
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#include "cosine.h"
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/* The open_file_* routines should return:
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*
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* -1 on an I/O error;
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*
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* 1 if the file they're reading is one of the types it handles;
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*
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* 0 if the file they're reading isn't the type they're checking for.
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*
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* If the routine handles this type of file, it should set the "file_type"
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* field in the "struct wtap" to the type of the file.
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*
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* XXX - I need to drag my damn ANSI C spec in to figure out how to
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* declare a "const" array of pointers to functions; putting "const"
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* right after "static" isn't the right answer, at least according
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* to GCC, which whines if I do that.
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*
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* Put the trace files that are merely saved telnet-sessions last, since it's
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* possible that you could have captured someone a router telnet-session
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* using another tool. So, a libpcap trace of an toshiba "snoop" session
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* should be discovered as a libpcap file, not a toshiba file.
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*/
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static int (*open_routines[])(wtap *, int *) = {
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/* Files that have magic bytes in fixed locations. These
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* are easy to identify.
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*/
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libpcap_open,
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lanalyzer_open,
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ngsniffer_open,
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snoop_open,
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iptrace_open,
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netmon_open,
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netxray_open,
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radcom_open,
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nettl_open,
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visual_open,
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/* Files that don't have magic bytes at a fixed location,
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* but that instead require a heuristic of some sort to
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* identify them. This includes the ASCII trace files that
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* would be, for example, saved copies of a Telnet session
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* to some box.
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*/
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etherpeek_open,
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pppdump_open,
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ascend_open,
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toshiba_open,
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i4btrace_open,
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csids_open,
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vms_open,
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dbs_etherwatch_open,
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cosine_open,
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};
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#define N_FILE_TYPES (sizeof open_routines / sizeof open_routines[0])
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gboolean wtap_def_seek_read(wtap *wth, long seek_off,
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union wtap_pseudo_header *pseudo_header _U_,
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guint8 *pd, int len, int *err)
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{
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int bytes_read;
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if (file_seek(wth->random_fh, seek_off, SEEK_SET, err) == -1)
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return FALSE;
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bytes_read = file_read(pd, sizeof(guint8), len, wth->random_fh);
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if (bytes_read != len) {
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*err = file_error(wth->random_fh);
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if (*err == 0)
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*err = WTAP_ERR_SHORT_READ;
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return FALSE;
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}
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return TRUE;
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}
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/*
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* Visual C++ on Win32 systems doesn't define these. (Old UNIX systems don't
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* define them either.)
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*
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* Visual C++ on Win32 systems doesn't define S_IFIFO, it defines _S_IFIFO.
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*/
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#ifndef S_ISREG
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#define S_ISREG(mode) (((mode) & S_IFMT) == S_IFREG)
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#endif
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#ifndef S_IFIFO
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#define S_IFIFO _S_IFIFO
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#endif
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#ifndef S_ISFIFO
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#define S_ISFIFO(mode) (((mode) & S_IFMT) == S_IFIFO)
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#endif
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#ifndef S_ISDIR
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#define S_ISDIR(mode) (((mode) & S_IFMT) == S_IFDIR)
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#endif
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/* Opens a file and prepares a wtap struct.
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If "do_random" is TRUE, it opens the file twice; the second open
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allows the application to do random-access I/O without moving
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the seek offset for sequential I/O, which is used by Ethereal
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so that it can do sequential I/O to a capture file that's being
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written to as new packets arrive independently of random I/O done
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to display protocol trees for packets when they're selected. */
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wtap* wtap_open_offline(const char *filename, int *err, gboolean do_random)
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{
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struct stat statb;
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wtap *wth;
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unsigned int i;
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/* First, make sure the file is valid */
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if (stat(filename, &statb) < 0) {
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*err = errno;
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return NULL;
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}
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if (S_ISFIFO(statb.st_mode)) {
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/*
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* Opens of FIFOs are allowed only when not opening
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* for random access.
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*
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* XXX - currently, we do seeking when trying to find
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* out the file type, so we don't actually support
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* opening FIFOs. However, we may eventually
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* do buffering that allows us to do at least some
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* file type determination even on pipes, so we
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* allow FIFO opens and let things fail later when
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* we try to seek.
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*/
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if (do_random) {
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*err = WTAP_ERR_RANDOM_OPEN_PIPE;
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return NULL;
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}
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} else if (S_ISDIR(statb.st_mode)) {
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/*
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* Return different errors for "this is a directory"
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* and "this is some random special file type", so
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* the user can get a potentially more helpful error.
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*/
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*err = EISDIR;
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return NULL;
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} else if (! S_ISREG(statb.st_mode)) {
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*err = WTAP_ERR_NOT_REGULAR_FILE;
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return NULL;
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}
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errno = ENOMEM;
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wth = g_malloc(sizeof(wtap));
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if (wth == NULL) {
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*err = errno;
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return NULL;
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}
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/* Win32 needs the O_BINARY flag for open() */
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#ifndef O_BINARY
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#define O_BINARY 0
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#endif
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/* Open the file */
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errno = WTAP_ERR_CANT_OPEN;
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wth->fd = open(filename, O_RDONLY|O_BINARY);
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if (wth->fd < 0) {
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*err = errno;
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g_free(wth);
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return NULL;
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}
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if (!(wth->fh = filed_open(wth->fd, "rb"))) {
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*err = errno;
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g_free(wth);
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return NULL;
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}
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if (do_random) {
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if (!(wth->random_fh = file_open(filename, "rb"))) {
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*err = errno;
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file_close(wth->fh);
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g_free(wth);
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return NULL;
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}
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} else
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wth->random_fh = NULL;
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/* initialization */
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wth->file_encap = WTAP_ENCAP_UNKNOWN;
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wth->data_offset = 0;
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wth->subtype_sequential_close = NULL;
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wth->subtype_close = NULL;
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/* Try all file types */
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for (i = 0; i < N_FILE_TYPES; i++) {
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/* Seek back to the beginning of the file; the open routine
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for the previous file type may have left the file
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position somewhere other than the beginning, and the
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open routine for this file type will probably want
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to start reading at the beginning.
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Initialize the data offset while we're at it. */
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if (file_seek(wth->fh, 0, SEEK_SET, err) == -1) {
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/* I/O error - give up */
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if (wth->random_fh != NULL)
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file_close(wth->random_fh);
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file_close(wth->fh);
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g_free(wth);
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return NULL;
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}
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wth->data_offset = 0;
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switch ((*open_routines[i])(wth, err)) {
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case -1:
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/* I/O error - give up */
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if (wth->random_fh != NULL)
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file_close(wth->random_fh);
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file_close(wth->fh);
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g_free(wth);
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return NULL;
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case 0:
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/* No I/O error, but not that type of file */
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break;
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case 1:
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/* We found the file type */
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goto success;
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}
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}
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/* Well, it's not one of the types of file we know about. */
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if (wth->random_fh != NULL)
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file_close(wth->random_fh);
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file_close(wth->fh);
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g_free(wth);
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*err = WTAP_ERR_FILE_UNKNOWN_FORMAT;
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return NULL;
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success:
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wth->frame_buffer = g_malloc(sizeof(struct Buffer));
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buffer_init(wth->frame_buffer, 1500);
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return wth;
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}
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/* Table of the file types we know about. */
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static const struct file_type_info {
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const char *name;
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const char *short_name;
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int (*can_write_encap)(int);
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int (*dump_open)(wtap_dumper *, gboolean, int *);
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} dump_open_table[WTAP_NUM_FILE_TYPES] = {
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/* WTAP_FILE_UNKNOWN */
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{ NULL, NULL,
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NULL, NULL },
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/* WTAP_FILE_WTAP */
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{ "Wiretap (Ethereal)", NULL,
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NULL, NULL },
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/* WTAP_FILE_PCAP */
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{ "libpcap (tcpdump, Ethereal, etc.)", "libpcap",
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libpcap_dump_can_write_encap, libpcap_dump_open },
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/* WTAP_FILE_PCAP_SS990417 */
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{ "Red Hat Linux 6.1 libpcap (tcpdump)", "rh6_1libpcap",
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libpcap_dump_can_write_encap, libpcap_dump_open },
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/* WTAP_FILE_PCAP_SS990915 */
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{ "SuSE Linux 6.3 libpcap (tcpdump)", "suse6_3libpcap",
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libpcap_dump_can_write_encap, libpcap_dump_open },
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/* WTAP_FILE_PCAP_SS991029 */
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{ "modified libpcap (tcpdump)", "modlibpcap",
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libpcap_dump_can_write_encap, libpcap_dump_open },
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/* WTAP_FILE_PCAP_NOKIA */
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{ "Nokia libpcap (tcpdump)", "nokialibpcap",
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libpcap_dump_can_write_encap, libpcap_dump_open },
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/* WTAP_FILE_PCAP_AIX */
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{ "AIX libpcap (tcpdump)", NULL,
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NULL, NULL },
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/* WTAP_FILE_LANALYZER */
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{ "Novell LANalyzer","lanalyzer",
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lanalyzer_dump_can_write_encap, lanalyzer_dump_open },
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/* WTAP_FILE_NGSNIFFER_UNCOMPRESSED */
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{ "Network Associates Sniffer (DOS-based)", "ngsniffer",
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ngsniffer_dump_can_write_encap, ngsniffer_dump_open },
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/* WTAP_FILE_NGSNIFFER_COMPRESSED */
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{ "Network Associates Sniffer (DOS-based), compressed", "ngsniffer_comp",
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NULL, NULL },
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/* WTAP_FILE_SNOOP */
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{ "Sun snoop", "snoop",
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snoop_dump_can_write_encap, snoop_dump_open },
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/* WTAP_FILE_IPTRACE_1_0 */
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{ "AIX iptrace 1.0", NULL,
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NULL, NULL },
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/* WTAP_FILE_IPTRACE_2_0 */
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{ "AIX iptrace 2.0", NULL,
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NULL, NULL },
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/* WTAP_FILE_NETMON_1_x */
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{ "Microsoft Network Monitor 1.x", "netmon1",
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netmon_dump_can_write_encap, netmon_dump_open },
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/* WTAP_FILE_NETMON_2_x */
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{ "Microsoft Network Monitor 2.x", "netmon2",
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netmon_dump_can_write_encap, netmon_dump_open },
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/* WTAP_FILE_NETXRAY_OLD */
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{ "Cinco Networks NetXRay 1.x", NULL,
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NULL, NULL },
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/* WTAP_FILE_NETXRAY_1_0 */
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{ "Cinco Networks NetXRay 2.0 or later", NULL,
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NULL, NULL },
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/* WTAP_FILE_NETXRAY_1_1 */
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{ "Network Associates Sniffer (Windows-based) 1.1", "ngwsniffer_1_1",
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netxray_dump_can_write_encap, netxray_dump_open_1_1 },
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/* WTAP_FILE_NETXRAY_2_00x */
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{ "Network Associates Sniffer (Windows-based) 2.00x", "ngwsniffer_2_0",
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netxray_dump_can_write_encap, netxray_dump_open_2_0 },
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/* WTAP_FILE_RADCOM */
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{ "RADCOM WAN/LAN analyzer", NULL,
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NULL, NULL },
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/* WTAP_FILE_ASCEND */
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{ "Lucent/Ascend access server trace", NULL,
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NULL, NULL },
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/* WTAP_FILE_NETTL */
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{ "HP-UX nettl trace", NULL,
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NULL, NULL },
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/* WTAP_FILE_TOSHIBA */
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{ "Toshiba Compact ISDN Router snoop trace", NULL,
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NULL, NULL },
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/* WTAP_FILE_I4BTRACE */
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{ "I4B ISDN trace", NULL,
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NULL, NULL },
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/* WTAP_FILE_CSIDS */
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{ "CSIDS IPLog", NULL,
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NULL, NULL },
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/* WTAP_FILE_PPPDUMP */
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{ "pppd log (pppdump format)", NULL,
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NULL, NULL },
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/* WTAP_FILE_ETHERPEEK_V56 */
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{ "EtherPeek/TokenPeek trace (V5 & V6 file format)", NULL,
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NULL, NULL },
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/* WTAP_FILE_ETHERPEEK_V7 */
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{ "EtherPeek/TokenPeek/AiroPeek trace (V7 file format)", NULL,
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NULL, NULL },
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/* WTAP_FILE_VMS */
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{ "TCPIPtrace (VMS)", NULL,
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NULL, NULL},
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/* WTAP_FILE_DBS_ETHERWATCH */
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{ "DBS Etherwatch (VMS)", NULL,
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NULL, NULL},
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/* WTAP_FILE_VISUAL_NETWORKS */
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{ "Visual Networks traffic capture", "visual",
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visual_dump_can_write_encap, visual_dump_open },
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/* WTAP_FILE_COSINE */
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{ "CoSine IPSX L2 capture", "cosine",
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NULL, NULL },
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};
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/* Name that should be somewhat descriptive. */
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const char *wtap_file_type_string(int filetype)
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{
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if (filetype < 0 || filetype >= WTAP_NUM_FILE_TYPES) {
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g_error("Unknown capture file type %d", filetype);
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return NULL;
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} else
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return dump_open_table[filetype].name;
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}
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/* Name to use in, say, a command-line flag specifying the type. */
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const char *wtap_file_type_short_string(int filetype)
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{
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if (filetype < 0 || filetype >= WTAP_NUM_FILE_TYPES)
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return NULL;
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else
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return dump_open_table[filetype].short_name;
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}
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/* Translate a short name to a capture file type. */
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int wtap_short_string_to_file_type(const char *short_name)
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{
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int filetype;
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for (filetype = 0; filetype < WTAP_NUM_FILE_TYPES; filetype++) {
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if (dump_open_table[filetype].short_name != NULL &&
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strcmp(short_name, dump_open_table[filetype].short_name) == 0)
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return filetype;
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}
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return -1; /* no such file type, or we can't write it */
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}
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gboolean wtap_dump_can_open(int filetype)
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{
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if (filetype < 0 || filetype >= WTAP_NUM_FILE_TYPES
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|| dump_open_table[filetype].dump_open == NULL)
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return FALSE;
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return TRUE;
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}
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gboolean wtap_dump_can_write_encap(int filetype, int encap)
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{
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if (filetype < 0 || filetype >= WTAP_NUM_FILE_TYPES
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|| dump_open_table[filetype].can_write_encap == NULL)
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return FALSE;
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if ((*dump_open_table[filetype].can_write_encap)(encap) != 0)
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return FALSE;
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return TRUE;
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}
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static gboolean wtap_dump_open_check(int filetype, int encap, int *err);
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static wtap_dumper* wtap_dump_alloc_wdh(int filetype, int encap, int snaplen,
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int *err);
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static gboolean wtap_dump_open_finish(wtap_dumper *wdh, int filetype, int *err);
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wtap_dumper* wtap_dump_open(const char *filename, int filetype, int encap,
|
|
int snaplen, int *err)
|
|
{
|
|
wtap_dumper *wdh;
|
|
FILE *fh;
|
|
|
|
/* Check whether we can open a capture file with that file type
|
|
and that encapsulation. */
|
|
if (!wtap_dump_open_check(filetype, encap, err))
|
|
return NULL;
|
|
|
|
/* Allocate a data structure for the output stream. */
|
|
wdh = wtap_dump_alloc_wdh(filetype, encap, snaplen, err);
|
|
if (wdh == NULL)
|
|
return NULL; /* couldn't allocate it */
|
|
|
|
/* Empty filename means stdout */
|
|
if (*filename == '\0')
|
|
wdh->fh = stdout;
|
|
else {
|
|
/* In case "fopen()" fails but doesn't set "errno", set "errno"
|
|
to a generic "the open failed" error. */
|
|
errno = WTAP_ERR_CANT_OPEN;
|
|
fh = fopen(filename, "wb");
|
|
if (fh == NULL) {
|
|
*err = errno;
|
|
return NULL; /* can't create file */
|
|
}
|
|
wdh->fh = fh;
|
|
}
|
|
|
|
if (!wtap_dump_open_finish(wdh, filetype, err)) {
|
|
/* Get rid of the file we created; we couldn't finish
|
|
opening it. */
|
|
if (wdh->fh != stdout)
|
|
unlink(filename);
|
|
return NULL;
|
|
}
|
|
return wdh;
|
|
}
|
|
|
|
wtap_dumper* wtap_dump_fdopen(int fd, int filetype, int encap, int snaplen,
|
|
int *err)
|
|
{
|
|
wtap_dumper *wdh;
|
|
FILE *fh;
|
|
|
|
/* Check whether we can open a capture file with that file type
|
|
and that encapsulation. */
|
|
if (!wtap_dump_open_check(filetype, encap, err))
|
|
return NULL;
|
|
|
|
/* Allocate a data structure for the output stream. */
|
|
wdh = wtap_dump_alloc_wdh(filetype, encap, snaplen, err);
|
|
if (wdh == NULL)
|
|
return NULL; /* couldn't allocate it */
|
|
|
|
/* In case "fopen()" fails but doesn't set "errno", set "errno"
|
|
to a generic "the open failed" error. */
|
|
errno = WTAP_ERR_CANT_OPEN;
|
|
fh = fdopen(fd, "wb");
|
|
if (fh == NULL) {
|
|
*err = errno;
|
|
return NULL; /* can't create standard I/O stream */
|
|
}
|
|
wdh->fh = fh;
|
|
|
|
if (!wtap_dump_open_finish(wdh, filetype, err))
|
|
return NULL;
|
|
return wdh;
|
|
}
|
|
|
|
static gboolean wtap_dump_open_check(int filetype, int encap, int *err)
|
|
{
|
|
if (!wtap_dump_can_open(filetype)) {
|
|
/* Invalid type, or type we don't know how to write. */
|
|
*err = WTAP_ERR_UNSUPPORTED_FILE_TYPE;
|
|
return FALSE;
|
|
}
|
|
|
|
/* OK, we know how to write that type; can we write the specified
|
|
encapsulation type? */
|
|
*err = (*dump_open_table[filetype].can_write_encap)(encap);
|
|
if (*err != 0)
|
|
return FALSE;
|
|
|
|
/* All systems go! */
|
|
return TRUE;
|
|
}
|
|
|
|
static wtap_dumper* wtap_dump_alloc_wdh(int filetype, int encap, int snaplen,
|
|
int *err)
|
|
{
|
|
wtap_dumper *wdh;
|
|
|
|
wdh = g_malloc(sizeof (wtap_dumper));
|
|
if (wdh == NULL) {
|
|
*err = errno;
|
|
return NULL;
|
|
}
|
|
wdh->fh = NULL;
|
|
wdh->file_type = filetype;
|
|
wdh->snaplen = snaplen;
|
|
wdh->encap = encap;
|
|
wdh->bytes_dumped = 0;
|
|
wdh->dump.opaque = NULL;
|
|
wdh->subtype_write = NULL;
|
|
wdh->subtype_close = NULL;
|
|
return wdh;
|
|
}
|
|
|
|
static gboolean wtap_dump_open_finish(wtap_dumper *wdh, int filetype, int *err)
|
|
{
|
|
int fd;
|
|
gboolean cant_seek;
|
|
|
|
/* Can we do a seek on the file descriptor?
|
|
If not, note that fact. */
|
|
fd = fileno(wdh->fh);
|
|
if (lseek(fd, 1, SEEK_CUR) == -1)
|
|
cant_seek = TRUE;
|
|
else {
|
|
/* Undo the seek. */
|
|
lseek(fd, 0, SEEK_SET);
|
|
cant_seek = FALSE;
|
|
}
|
|
|
|
/* Now try to open the file for writing. */
|
|
if (!(*dump_open_table[filetype].dump_open)(wdh, cant_seek, err)) {
|
|
/* The attempt failed. Close the stream for the file.
|
|
NOTE: this means the FD handed to "wtap_dump_fdopen()"
|
|
will be closed if the open fails. */
|
|
if (wdh->fh != stdout)
|
|
fclose(wdh->fh);
|
|
|
|
/* Now free up the dumper handle. */
|
|
g_free(wdh);
|
|
return FALSE;
|
|
}
|
|
|
|
return TRUE; /* success! */
|
|
}
|
|
|
|
FILE* wtap_dump_file(wtap_dumper *wdh)
|
|
{
|
|
return wdh->fh;
|
|
}
|
|
|
|
gboolean wtap_dump(wtap_dumper *wdh, const struct wtap_pkthdr *phdr,
|
|
const union wtap_pseudo_header *pseudo_header, const guchar *pd, int *err)
|
|
{
|
|
return (wdh->subtype_write)(wdh, phdr, pseudo_header, pd, err);
|
|
}
|
|
|
|
gboolean wtap_dump_close(wtap_dumper *wdh, int *err)
|
|
{
|
|
gboolean ret = TRUE;
|
|
|
|
if (wdh->subtype_close != NULL) {
|
|
/* There's a close routine for this dump stream. */
|
|
if (!(wdh->subtype_close)(wdh, err))
|
|
ret = FALSE;
|
|
}
|
|
errno = WTAP_ERR_CANT_CLOSE;
|
|
/* Don't close stdout */
|
|
if (wdh->fh != stdout) {
|
|
if (fclose(wdh->fh) == EOF) {
|
|
if (ret) {
|
|
/* The per-format close function succeeded,
|
|
but the fclose didn't. Save the reason
|
|
why, if our caller asked for it. */
|
|
if (err != NULL)
|
|
*err = errno;
|
|
}
|
|
ret = FALSE;
|
|
}
|
|
}
|
|
if (wdh->dump.opaque != NULL)
|
|
g_free(wdh->dump.opaque);
|
|
g_free(wdh);
|
|
return ret;
|
|
}
|
|
|
|
long wtap_get_bytes_dumped(wtap_dumper *wdh)
|
|
{
|
|
return wdh->bytes_dumped;
|
|
}
|
|
|
|
void wtap_set_bytes_dumped(wtap_dumper *wdh, long bytes_dumped)
|
|
{
|
|
wdh->bytes_dumped = bytes_dumped;
|
|
}
|
|
|