745 lines
23 KiB
C
745 lines
23 KiB
C
/* snoop.c
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*
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* $Id: snoop.c,v 1.56 2002/09/04 19:29:59 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 <errno.h>
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#include <string.h>
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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 "atm.h"
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#include "snoop.h"
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/* See RFC 1761 for a description of the "snoop" file format. */
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/* Magic number in "snoop" files. */
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static const char snoop_magic[] = {
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's', 'n', 'o', 'o', 'p', '\0', '\0', '\0'
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};
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/* "snoop" file header (minus magic number). */
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struct snoop_hdr {
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guint32 version; /* version number (should be 2) */
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guint32 network; /* network type */
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};
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/* "snoop" record header. */
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struct snooprec_hdr {
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guint32 orig_len; /* actual length of packet */
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guint32 incl_len; /* number of octets captured in file */
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guint32 rec_len; /* length of record */
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guint32 cum_drops; /* cumulative number of dropped packets */
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guint32 ts_sec; /* timestamp seconds */
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guint32 ts_usec; /* timestamp microseconds */
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};
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/*
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* The link-layer header on ATM packets.
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*/
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struct snoop_atm_hdr {
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guint8 flags; /* destination and traffic type */
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guint8 vpi; /* VPI */
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guint16 vci; /* VCI */
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};
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static gboolean snoop_read(wtap *wth, int *err, long *data_offset);
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static gboolean snoop_seek_read(wtap *wth, long seek_off,
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union wtap_pseudo_header *pseudo_header, guchar *pd, int length, int *err);
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static gboolean snoop_read_atm_pseudoheader(FILE_T fh,
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union wtap_pseudo_header *pseudo_header, int *err);
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static gboolean snoop_read_rec_data(FILE_T fh, guchar *pd, int length,
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int *err);
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static gboolean snoop_dump(wtap_dumper *wdh, const struct wtap_pkthdr *phdr,
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const union wtap_pseudo_header *pseudo_header, const guchar *pd, int *err);
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/*
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* See
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*
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* http://www.opengroup.org/onlinepubs/9638599/apdxf.htm
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*
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* for the "dlpi.h" header file specified by The Open Group, which lists
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* the DL_ values for various protocols; Solaris 7 uses the same values.
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*
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* The page at
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*
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* http://mrpink.lerc.nasa.gov/118x/support.html
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*
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* had links to modified versions of "tcpdump" and "libpcap" for SUNatm
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* DLPI support; they suggested that the 3.0 verson of SUNatm uses those
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* values. The Wayback Machine archived that page, but not the stuff
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* to which it linked, unfortunately.
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*
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* It also has a link to "convert.c", which is a program to convert files
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* from the format written by the "atmsnoop" program that comes with the
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* SunATM package to regular "snoop" format, claims that "SunATM 2.1 claimed
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* to be DL_FDDI (don't ask why). SunATM 3.0 claims to be DL_IPATM, which
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* is 0x12".
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*
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* It also says that "ATM Mac header is 12 bytes long.", and seems to imply
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* that in an "atmsnoop" file, the header contains 2 bytes (direction and
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* VPI?), 2 bytes of VCI, 6 bytes of something, and 2 bytes of Ethernet
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* type; if those 6 bytes are 2 bytes of DSAP, 2 bytes of LSAP, 1 byte
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* of LLC control, and 3 bytes of SNAP OUI, that'd mean that an ATM
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* pseudo-header in an "atmsnoop" file is probably 1 byte of direction,
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* 1 byte of VPI, and 2 bytes of VCI.
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*
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* The aforementioned page also has a link to some capture files from
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* "atmsnoop"; this version of "snoop.c" appears to be able to read them.
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*
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* Source to an "atmdump" package, which includes a modified version of
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* "libpcap" to handle SunATM DLPI and an ATM driver for FreeBSD, and
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* also includes "atmdump", which is a modified "tcpdump", is available
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* at
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*
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* ftp://ftp.cs.ndsu.nodak.edu/pub/freebsd/atm/atm-bpf.tgz
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*
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* and that code also indicates that DL_IPATM is used, and that an
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* ATM packet handed up from the Sun driver for the Sun SBus ATM card on
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* Solaris 2.5.1 has 1 byte of direction, 1 byte of VPI, 2 bytes of VCI,
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* and then the ATM PDU, and suggests that the direction flag is 0x80 for
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* "transmitted" (presumably meaning DTE->DCE) and presumably not 0x80 for
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* "received" (presumably meaning DCE->DTE). That code was used as the
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* basis for the SunATM support in current CVS versions of libpcap and
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* tcpdump, and it works.
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*
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* In fact, the "direction" byte appears to have some other stuff, perhaps
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* a traffic type, in the lower 7 bits, with the 8th bit indicating the
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* direction. That appears to be the case.
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*
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* I don't know what the encapsulation of any of the other types is, so I
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* leave them all as WTAP_ENCAP_UNKNOWN. I also don't know whether "snoop"
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* can handle any of them (it presumably can't handle ATM, otherwise Sun
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* wouldn't have supplied "atmsnoop"; even if it can't, this may be useful
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* reference information for anybody doing code to use DLPI to do raw packet
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* captures on those network types.
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*
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* See
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*
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* http://web.archive.org/web/20010906213807/http://www.shomiti.com/support/TNCapFileFormat.htm
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*
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* for information on Shomiti's mutant flavor of snoop. For some unknown
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* unknown reason, they decided not to just Go With The DLPI Flow, and
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* instead used the types unspecified in RFC 1461 for their own nefarious
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* purposes, such as distinguishing 10MB from 100MB from 1000MB Ethernet
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* and distinguishing 4MB from 16MB Token Ring, and distinguishing both
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* of them from the "Shomiti" versions of same.
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*/
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int snoop_open(wtap *wth, int *err)
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{
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int bytes_read;
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char magic[sizeof snoop_magic];
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struct snoop_hdr hdr;
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static const int snoop_encap[] = {
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WTAP_ENCAP_ETHERNET, /* IEEE 802.3 */
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WTAP_ENCAP_UNKNOWN, /* IEEE 802.4 Token Bus */
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WTAP_ENCAP_TOKEN_RING,
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WTAP_ENCAP_UNKNOWN, /* IEEE 802.6 Metro Net */
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WTAP_ENCAP_ETHERNET,
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WTAP_ENCAP_UNKNOWN, /* HDLC */
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WTAP_ENCAP_UNKNOWN, /* Character Synchronous, e.g. bisync */
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WTAP_ENCAP_UNKNOWN, /* IBM Channel-to-Channel */
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WTAP_ENCAP_FDDI_BITSWAPPED,
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WTAP_ENCAP_UNKNOWN, /* Other */
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WTAP_ENCAP_UNKNOWN, /* Frame Relay LAPF */
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WTAP_ENCAP_UNKNOWN, /* Multi-protocol over Frame Relay */
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WTAP_ENCAP_UNKNOWN, /* Character Async (e.g., SLIP and PPP?) */
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WTAP_ENCAP_UNKNOWN, /* X.25 Classical IP */
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WTAP_ENCAP_UNKNOWN, /* software loopback */
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WTAP_ENCAP_UNKNOWN, /* not defined in "dlpi.h" */
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WTAP_ENCAP_UNKNOWN, /* Fibre Channel */
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WTAP_ENCAP_UNKNOWN, /* ATM */
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WTAP_ENCAP_ATM_SNIFFER, /* ATM Classical IP */
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WTAP_ENCAP_UNKNOWN, /* X.25 LAPB */
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WTAP_ENCAP_UNKNOWN, /* ISDN */
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WTAP_ENCAP_UNKNOWN, /* HIPPI */
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WTAP_ENCAP_UNKNOWN, /* 100VG-AnyLAN Ethernet */
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WTAP_ENCAP_UNKNOWN, /* 100VG-AnyLAN Token Ring */
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WTAP_ENCAP_UNKNOWN, /* "ISO 8802/3 and Ethernet" */
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WTAP_ENCAP_UNKNOWN, /* 100BaseT (but that's just Ethernet) */
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};
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#define NUM_SNOOP_ENCAPS (sizeof snoop_encap / sizeof snoop_encap[0])
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static const int shomiti_encap[] = {
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WTAP_ENCAP_ETHERNET, /* IEEE 802.3 */
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WTAP_ENCAP_UNKNOWN, /* IEEE 802.4 Token Bus */
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WTAP_ENCAP_TOKEN_RING,
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WTAP_ENCAP_UNKNOWN, /* IEEE 802.6 Metro Net */
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WTAP_ENCAP_ETHERNET,
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WTAP_ENCAP_UNKNOWN, /* HDLC */
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WTAP_ENCAP_UNKNOWN, /* Character Synchronous, e.g. bisync */
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WTAP_ENCAP_UNKNOWN, /* IBM Channel-to-Channel */
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WTAP_ENCAP_FDDI_BITSWAPPED,
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WTAP_ENCAP_UNKNOWN, /* Other */
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WTAP_ENCAP_ETHERNET, /* Fast Ethernet */
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WTAP_ENCAP_TOKEN_RING, /* 4MB 802.5 token ring */
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WTAP_ENCAP_ETHERNET, /* Gigabit Ethernet */
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WTAP_ENCAP_TOKEN_RING, /* "IEEE 802.5 Shomiti" */
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WTAP_ENCAP_TOKEN_RING, /* "4MB IEEE 802.5 Shomiti" */
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};
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#define NUM_SHOMITI_ENCAPS (sizeof shomiti_encap / sizeof shomiti_encap[0])
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int file_encap;
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/* Read in the string that should be at the start of a "snoop" file */
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errno = WTAP_ERR_CANT_READ;
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bytes_read = file_read(magic, 1, sizeof magic, wth->fh);
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if (bytes_read != sizeof magic) {
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*err = file_error(wth->fh);
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if (*err != 0)
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return -1;
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return 0;
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}
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wth->data_offset += sizeof magic;
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if (memcmp(magic, snoop_magic, sizeof snoop_magic) != 0) {
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return 0;
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}
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/* Read the rest of the header. */
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errno = WTAP_ERR_CANT_READ;
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bytes_read = file_read(&hdr, 1, sizeof hdr, wth->fh);
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if (bytes_read != sizeof hdr) {
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*err = file_error(wth->fh);
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if (*err != 0)
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return -1;
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return 0;
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}
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wth->data_offset += sizeof hdr;
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/*
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* Oh, this is lovely.
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*
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* I suppose Shomiti could give a bunch of lawyerly noise about
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* how "well, RFC 1761 said they were unassigned, and that's
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* the standard, not the DLPI header file, so it's perfectly OK
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* for us to use them, blah blah blah", but it's still irritating
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* as hell that they used the unassigned-in-RFC-1761 values for
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* their own purposes - especially given that Sun also used
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* one of them in atmsnoop.
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*
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* For now, we treat a version number of 2 as indicating that
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* this is a Sun snoop file, and version numbers of 3, 4, and 5
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* as indicating that this is a Shomiti file, even though
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* their capture file format documentation claims that they
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* use 2 if the data "was captured using an NDIS card", which
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* presumably means "captured with an ordinary boring network
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* card via NDIS" as opposed to "captured with our whizzo
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* special capture hardware".
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*
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* This runs the risk that we may misinterpret the network
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* type of Shomiti captures not done using their hardware.
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* Currently, the only not-in-RFC-1761 type we interpret in
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* Sun snoop files is 18, for atmsnoop, and that's not used
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* by Shomiti, but if any of the types used by Shomiti are
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* also used by Snoop or a variant thereof - e.g.:
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*
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* value snoop Shomiti
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* 10 Frame Relay 100MB Ethernet
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* 11 MP over Frame Relay 4MB 802.5
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* 12 "Character Async" 1000MB Ethernet
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* 13 X.25 Classical IP "IEEE 802.5 Shomiti"
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* 14 "software loopback" "4MB IEEE 802.5 Shomiti"
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*
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* then we have a problem that may be resolvable only by checking
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* how much padding there is in the first packet - if there're 3
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* bytes or less, it's probably Sun snoop, which uses the padding
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* only for padding, but if there's more, it's probably a Shomiti
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* tool, which uses the padding for additional information.
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*/
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hdr.version = g_ntohl(hdr.version);
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hdr.network = g_ntohl(hdr.network);
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switch (hdr.version) {
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case 2: /* Solaris 2.x and later snoop, and Shomiti
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Surveyor prior to 3.0 (or 3.x with NDIS card?) */
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if (hdr.network >= NUM_SNOOP_ENCAPS
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|| snoop_encap[hdr.network] == WTAP_ENCAP_UNKNOWN) {
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g_message("snoop: network type %u unknown or unsupported",
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hdr.network);
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*err = WTAP_ERR_UNSUPPORTED_ENCAP;
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return -1;
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}
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file_encap = snoop_encap[hdr.network];
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break;
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case 3: /* Surveyor 3.0 and later, with Shomiti CMM2 hardware */
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case 4: /* Surveyor 3.0 and later, with Shomiti GAM hardware */
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case 5: /* Surveyor 3.0 and later, with Shomiti THG hardware */
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if (hdr.network >= NUM_SHOMITI_ENCAPS
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|| shomiti_encap[hdr.network] == WTAP_ENCAP_UNKNOWN) {
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g_message("snoop: Shomiti network type %u unknown or unsupported",
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hdr.network);
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*err = WTAP_ERR_UNSUPPORTED_ENCAP;
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return -1;
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}
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file_encap = shomiti_encap[hdr.network];
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break;
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default:
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g_message("snoop: version %u unsupported", hdr.version);
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*err = WTAP_ERR_UNSUPPORTED;
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return -1;
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}
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/* This is a snoop file */
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wth->file_type = WTAP_FILE_SNOOP;
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wth->subtype_read = snoop_read;
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wth->subtype_seek_read = snoop_seek_read;
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wth->file_encap = file_encap;
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wth->snapshot_length = 0; /* not available in header */
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return 1;
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}
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/* Read the next packet */
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static gboolean snoop_read(wtap *wth, int *err, long *data_offset)
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{
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guint32 rec_size;
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guint32 packet_size;
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guint32 orig_size;
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int bytes_read;
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struct snooprec_hdr hdr;
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char padbuf[4];
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int padbytes;
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int bytes_to_read;
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/* Read record header. */
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errno = WTAP_ERR_CANT_READ;
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bytes_read = file_read(&hdr, 1, sizeof hdr, wth->fh);
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if (bytes_read != sizeof hdr) {
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*err = file_error(wth->fh);
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if (*err == 0 && bytes_read != 0) {
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*err = WTAP_ERR_SHORT_READ;
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}
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return FALSE;
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}
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wth->data_offset += sizeof hdr;
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rec_size = g_ntohl(hdr.rec_len);
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orig_size = g_ntohl(hdr.orig_len);
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packet_size = g_ntohl(hdr.incl_len);
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if (packet_size > WTAP_MAX_PACKET_SIZE) {
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/*
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* Probably a corrupt capture file; don't blow up trying
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* to allocate space for an immensely-large packet.
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*/
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g_message("snoop: File has %u-byte packet, bigger than maximum of %u",
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packet_size, WTAP_MAX_PACKET_SIZE);
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*err = WTAP_ERR_BAD_RECORD;
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return FALSE;
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}
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*data_offset = wth->data_offset;
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/*
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* If this is an ATM packet, the first four bytes are the
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* direction of the packet (transmit/receive), the VPI, and
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* the VCI; read them and generate the pseudo-header from
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* them.
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*/
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if (wth->file_encap == WTAP_ENCAP_ATM_SNIFFER) {
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if (packet_size < sizeof (struct snoop_atm_hdr)) {
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/*
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* Uh-oh, the packet isn't big enough to even
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* have a pseudo-header.
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*/
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g_message("snoop: atmsnoop file has a %u-byte packet, too small to have even an ATM pseudo-header\n",
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packet_size);
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*err = WTAP_ERR_BAD_RECORD;
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return FALSE;
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}
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if (!snoop_read_atm_pseudoheader(wth->fh, &wth->pseudo_header,
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err))
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return FALSE; /* Read error */
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/*
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* Don't count the pseudo-header as part of the packet.
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*/
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rec_size -= sizeof (struct snoop_atm_hdr);
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orig_size -= sizeof (struct snoop_atm_hdr);
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packet_size -= sizeof (struct snoop_atm_hdr);
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wth->data_offset += sizeof (struct snoop_atm_hdr);
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}
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buffer_assure_space(wth->frame_buffer, packet_size);
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if (!snoop_read_rec_data(wth->fh, buffer_start_ptr(wth->frame_buffer),
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packet_size, err))
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return FALSE; /* Read error */
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wth->data_offset += packet_size;
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wth->phdr.ts.tv_sec = g_ntohl(hdr.ts_sec);
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wth->phdr.ts.tv_usec = g_ntohl(hdr.ts_usec);
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wth->phdr.caplen = packet_size;
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wth->phdr.len = orig_size;
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wth->phdr.pkt_encap = wth->file_encap;
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/*
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* If this is ATM LANE traffic, try to guess what type of LANE
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* traffic it is based on the packet contents.
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*/
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if (wth->file_encap == WTAP_ENCAP_ATM_SNIFFER &&
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wth->pseudo_header.atm.type == TRAF_LANE) {
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atm_guess_lane_type(buffer_start_ptr(wth->frame_buffer),
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wth->phdr.caplen, &wth->pseudo_header);
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}
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/*
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* Skip over the padding (don't "fseek()", as the standard
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* I/O library on some platforms discards buffered data if
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* you do that, which means it does a lot more reads).
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* There's probably not much padding (it's probably padded only
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* to a 4-byte boundary), so we probably need only do one read.
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*/
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padbytes = rec_size - (sizeof hdr + packet_size);
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while (padbytes != 0) {
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bytes_to_read = padbytes;
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if ((unsigned)bytes_to_read > sizeof padbuf)
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bytes_to_read = sizeof padbuf;
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errno = WTAP_ERR_CANT_READ;
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bytes_read = file_read(padbuf, 1, bytes_to_read, wth->fh);
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if (bytes_read != bytes_to_read) {
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*err = file_error(wth->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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wth->data_offset += bytes_read;
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padbytes -= bytes_read;
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}
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return TRUE;
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}
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static gboolean
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snoop_seek_read(wtap *wth, long seek_off,
|
|
union wtap_pseudo_header *pseudo_header, guchar *pd, int length, int *err)
|
|
{
|
|
if (file_seek(wth->random_fh, seek_off, SEEK_SET, err) == -1)
|
|
return FALSE;
|
|
|
|
if (wth->file_encap == WTAP_ENCAP_ATM_SNIFFER) {
|
|
if (!snoop_read_atm_pseudoheader(wth->random_fh, pseudo_header,
|
|
err)) {
|
|
/* Read error */
|
|
return FALSE;
|
|
}
|
|
}
|
|
|
|
/*
|
|
* Read the packet data.
|
|
*/
|
|
if (!snoop_read_rec_data(wth->random_fh, pd, length, err))
|
|
return FALSE; /* failed */
|
|
|
|
/*
|
|
* If this is ATM LANE traffic, try to guess what type of LANE
|
|
* traffic it is based on the packet contents.
|
|
*/
|
|
if (wth->file_encap == WTAP_ENCAP_ATM_SNIFFER &&
|
|
pseudo_header->atm.type == TRAF_LANE)
|
|
atm_guess_lane_type(pd, length, pseudo_header);
|
|
return TRUE;
|
|
}
|
|
|
|
static gboolean
|
|
snoop_read_atm_pseudoheader(FILE_T fh, union wtap_pseudo_header *pseudo_header,
|
|
int *err)
|
|
{
|
|
struct snoop_atm_hdr atm_phdr;
|
|
int bytes_read;
|
|
guint8 vpi;
|
|
guint16 vci;
|
|
|
|
errno = WTAP_ERR_CANT_READ;
|
|
bytes_read = file_read(&atm_phdr, 1, sizeof (struct snoop_atm_hdr), fh);
|
|
if (bytes_read != sizeof (struct snoop_atm_hdr)) {
|
|
*err = file_error(fh);
|
|
if (*err == 0)
|
|
*err = WTAP_ERR_SHORT_READ;
|
|
return FALSE;
|
|
}
|
|
|
|
vpi = atm_phdr.vpi;
|
|
vci = pntohs(&atm_phdr.vci);
|
|
|
|
/*
|
|
* The lower 4 bits of the first byte of the header indicate
|
|
* the type of traffic, as per the "atmioctl.h" header in
|
|
* SunATM.
|
|
*/
|
|
switch (atm_phdr.flags & 0x0F) {
|
|
|
|
case 0x01: /* LANE */
|
|
pseudo_header->atm.aal = AAL_5;
|
|
pseudo_header->atm.type = TRAF_LANE;
|
|
break;
|
|
|
|
case 0x02: /* RFC 1483 LLC multiplexed traffic */
|
|
pseudo_header->atm.aal = AAL_5;
|
|
pseudo_header->atm.type = TRAF_LLCMX;
|
|
break;
|
|
|
|
case 0x05: /* ILMI */
|
|
pseudo_header->atm.aal = AAL_5;
|
|
pseudo_header->atm.type = TRAF_ILMI;
|
|
break;
|
|
|
|
case 0x06: /* Signalling AAL */
|
|
pseudo_header->atm.aal = AAL_SIGNALLING;
|
|
pseudo_header->atm.type = TRAF_UNKNOWN;
|
|
break;
|
|
|
|
case 0x03: /* MARS (RFC 2022) */
|
|
pseudo_header->atm.aal = AAL_5;
|
|
pseudo_header->atm.type = TRAF_UNKNOWN;
|
|
break;
|
|
|
|
case 0x04: /* IFMP (Ipsilon Flow Management Protocol; see RFC 1954) */
|
|
pseudo_header->atm.aal = AAL_5;
|
|
pseudo_header->atm.type = TRAF_UNKNOWN; /* XXX - TRAF_IPSILON? */
|
|
break;
|
|
|
|
default:
|
|
/*
|
|
* Assume it's AAL5, unless it's VPI 0 and VCI 5, in which
|
|
* case assume it's AAL_SIGNALLING; we know nothing more
|
|
* about it.
|
|
*
|
|
* XXX - is this necessary? Or are we guaranteed that
|
|
* all signalling traffic has a type of 0x06?
|
|
*
|
|
* XXX - is this guaranteed to be AAL5? Or, if the type is
|
|
* 0x00 ("raw"), might it be non-AAL5 traffic?
|
|
*/
|
|
if (vpi == 0 && vci == 5)
|
|
pseudo_header->atm.aal = AAL_SIGNALLING;
|
|
else
|
|
pseudo_header->atm.aal = AAL_5;
|
|
pseudo_header->atm.type = TRAF_UNKNOWN;
|
|
break;
|
|
}
|
|
pseudo_header->atm.subtype = TRAF_ST_UNKNOWN;
|
|
|
|
pseudo_header->atm.vpi = vpi;
|
|
pseudo_header->atm.vci = vci;
|
|
pseudo_header->atm.channel = (atm_phdr.flags & 0x80) ? 1 : 0;
|
|
|
|
/* We don't have this information */
|
|
pseudo_header->atm.cells = 0;
|
|
pseudo_header->atm.aal5t_u2u = 0;
|
|
pseudo_header->atm.aal5t_len = 0;
|
|
pseudo_header->atm.aal5t_chksum = 0;
|
|
|
|
return TRUE;
|
|
}
|
|
|
|
static gboolean
|
|
snoop_read_rec_data(FILE_T fh, guchar *pd, int length, int *err)
|
|
{
|
|
int bytes_read;
|
|
|
|
errno = WTAP_ERR_CANT_READ;
|
|
bytes_read = file_read(pd, 1, length, fh);
|
|
|
|
if (bytes_read != length) {
|
|
*err = file_error(fh);
|
|
if (*err == 0)
|
|
*err = WTAP_ERR_SHORT_READ;
|
|
return FALSE;
|
|
}
|
|
return TRUE;
|
|
}
|
|
|
|
static const int wtap_encap[] = {
|
|
-1, /* WTAP_ENCAP_UNKNOWN -> unsupported */
|
|
0x04, /* WTAP_ENCAP_ETHERNET -> DL_ETHER */
|
|
0x02, /* WTAP_ENCAP_TOKEN_RING -> DL_TPR */
|
|
-1, /* WTAP_ENCAP_SLIP -> unsupported */
|
|
-1, /* WTAP_ENCAP_PPP -> unsupported */
|
|
0x08, /* WTAP_ENCAP_FDDI -> DL_FDDI */
|
|
0x08, /* WTAP_ENCAP_FDDI_BITSWAPPED -> DL_FDDI */
|
|
-1, /* WTAP_ENCAP_RAW_IP -> unsupported */
|
|
-1, /* WTAP_ENCAP_ARCNET -> unsupported */
|
|
-1, /* WTAP_ENCAP_ATM_RFC1483 -> unsupported */
|
|
-1, /* WTAP_ENCAP_LINUX_ATM_CLIP -> unsupported */
|
|
-1, /* WTAP_ENCAP_LAPB -> unsupported*/
|
|
0x12, /* WTAP_ENCAP_ATM_SNIFFER -> DL_IPATM */
|
|
-1 /* WTAP_ENCAP_NULL -> unsupported */
|
|
};
|
|
#define NUM_WTAP_ENCAPS (sizeof wtap_encap / sizeof wtap_encap[0])
|
|
|
|
/* Returns 0 if we could write the specified encapsulation type,
|
|
an error indication otherwise. */
|
|
int snoop_dump_can_write_encap(int encap)
|
|
{
|
|
/* Per-packet encapsulations aren't supported. */
|
|
if (encap == WTAP_ENCAP_PER_PACKET)
|
|
return WTAP_ERR_ENCAP_PER_PACKET_UNSUPPORTED;
|
|
|
|
if (encap < 0 || (unsigned)encap >= NUM_WTAP_ENCAPS || wtap_encap[encap] == -1)
|
|
return WTAP_ERR_UNSUPPORTED_ENCAP;
|
|
|
|
return 0;
|
|
}
|
|
|
|
/* Returns TRUE on success, FALSE on failure; sets "*err" to an error code on
|
|
failure */
|
|
gboolean snoop_dump_open(wtap_dumper *wdh, gboolean cant_seek _U_, int *err)
|
|
{
|
|
struct snoop_hdr file_hdr;
|
|
size_t nwritten;
|
|
|
|
/* This is a snoop file */
|
|
wdh->subtype_write = snoop_dump;
|
|
wdh->subtype_close = NULL;
|
|
|
|
/* Write the file header. */
|
|
nwritten = fwrite(&snoop_magic, 1, sizeof snoop_magic, wdh->fh);
|
|
if (nwritten != sizeof snoop_magic) {
|
|
if (nwritten == 0 && ferror(wdh->fh))
|
|
*err = errno;
|
|
else
|
|
*err = WTAP_ERR_SHORT_WRITE;
|
|
return FALSE;
|
|
}
|
|
|
|
/* current "snoop" format is 2 */
|
|
file_hdr.version = g_htonl(2);
|
|
file_hdr.network = g_htonl(wtap_encap[wdh->encap]);
|
|
nwritten = fwrite(&file_hdr, 1, sizeof file_hdr, wdh->fh);
|
|
if (nwritten != sizeof file_hdr) {
|
|
if (nwritten == 0 && ferror(wdh->fh))
|
|
*err = errno;
|
|
else
|
|
*err = WTAP_ERR_SHORT_WRITE;
|
|
return FALSE;
|
|
}
|
|
|
|
return TRUE;
|
|
}
|
|
|
|
/* Write a record for a packet to a dump file.
|
|
Returns TRUE on success, FALSE on failure. */
|
|
static gboolean snoop_dump(wtap_dumper *wdh,
|
|
const struct wtap_pkthdr *phdr,
|
|
const union wtap_pseudo_header *pseudo_header _U_,
|
|
const guchar *pd, int *err)
|
|
{
|
|
struct snooprec_hdr rec_hdr;
|
|
size_t nwritten;
|
|
int reclen;
|
|
guint padlen;
|
|
static char zeroes[4];
|
|
struct snoop_atm_hdr atm_hdr;
|
|
int atm_hdrsize;
|
|
|
|
if (wdh->encap == WTAP_ENCAP_ATM_SNIFFER)
|
|
atm_hdrsize = sizeof (struct snoop_atm_hdr);
|
|
else
|
|
atm_hdrsize = 0;
|
|
|
|
/* Record length = header length plus data length... */
|
|
reclen = sizeof rec_hdr + phdr->caplen + atm_hdrsize;
|
|
|
|
/* ... plus enough bytes to pad it to a 4-byte boundary. */
|
|
padlen = ((reclen + 3) & ~3) - reclen;
|
|
reclen += padlen;
|
|
|
|
rec_hdr.orig_len = g_htonl(phdr->len + atm_hdrsize);
|
|
rec_hdr.incl_len = g_htonl(phdr->caplen + atm_hdrsize);
|
|
rec_hdr.rec_len = g_htonl(reclen);
|
|
rec_hdr.cum_drops = 0;
|
|
rec_hdr.ts_sec = g_htonl(phdr->ts.tv_sec);
|
|
rec_hdr.ts_usec = g_htonl(phdr->ts.tv_usec);
|
|
nwritten = fwrite(&rec_hdr, 1, sizeof rec_hdr, wdh->fh);
|
|
if (nwritten != sizeof rec_hdr) {
|
|
if (nwritten == 0 && ferror(wdh->fh))
|
|
*err = errno;
|
|
else
|
|
*err = WTAP_ERR_SHORT_WRITE;
|
|
return FALSE;
|
|
}
|
|
|
|
if (wdh->encap == WTAP_ENCAP_ATM_SNIFFER) {
|
|
/*
|
|
* Write the ATM header.
|
|
*/
|
|
atm_hdr.flags =
|
|
(pseudo_header->atm.channel != 0) ? 0x80 : 0x00;
|
|
switch (pseudo_header->atm.aal) {
|
|
|
|
case AAL_SIGNALLING:
|
|
/* Signalling AAL */
|
|
atm_hdr.flags |= 0x06;
|
|
break;
|
|
|
|
case AAL_5:
|
|
switch (pseudo_header->atm.type) {
|
|
|
|
case TRAF_LANE:
|
|
/* LANE */
|
|
atm_hdr.flags |= 0x01;
|
|
break;
|
|
|
|
case TRAF_LLCMX:
|
|
/* RFC 1483 LLC multiplexed traffic */
|
|
atm_hdr.flags |= 0x02;
|
|
break;
|
|
|
|
case TRAF_ILMI:
|
|
/* ILMI */
|
|
atm_hdr.flags |= 0x05;
|
|
break;
|
|
}
|
|
break;
|
|
}
|
|
atm_hdr.vpi = pseudo_header->atm.vpi;
|
|
atm_hdr.vci = g_htons(pseudo_header->atm.vci);
|
|
nwritten = fwrite(&atm_hdr, 1, sizeof atm_hdr, wdh->fh);
|
|
if (nwritten != sizeof atm_hdr) {
|
|
if (nwritten == 0 && ferror(wdh->fh))
|
|
*err = errno;
|
|
else
|
|
*err = WTAP_ERR_SHORT_WRITE;
|
|
return FALSE;
|
|
}
|
|
}
|
|
|
|
nwritten = fwrite(pd, 1, phdr->caplen, wdh->fh);
|
|
if (nwritten != phdr->caplen) {
|
|
if (nwritten == 0 && ferror(wdh->fh))
|
|
*err = errno;
|
|
else
|
|
*err = WTAP_ERR_SHORT_WRITE;
|
|
return FALSE;
|
|
}
|
|
|
|
/* Now write the padding. */
|
|
nwritten = fwrite(zeroes, 1, padlen, wdh->fh);
|
|
if (nwritten != padlen) {
|
|
if (nwritten == 0 && ferror(wdh->fh))
|
|
*err = errno;
|
|
else
|
|
*err = WTAP_ERR_SHORT_WRITE;
|
|
return FALSE;
|
|
}
|
|
return TRUE;
|
|
}
|