nexmon – Rev 1
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/* snoop.c
*
* Wiretap Library
* Copyright (c) 1998 by Gilbert Ramirez <gram@alumni.rice.edu>
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License
* as published by the Free Software Foundation; either version 2
* of the License, or (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
*/
#include "config.h"
#include <errno.h>
#include <string.h>
#include "wtap-int.h"
#include "file_wrappers.h"
#include "atm.h"
#include "snoop.h"
/* See RFC 1761 for a description of the "snoop" file format. */
/* Magic number in "snoop" files. */
static const char snoop_magic[] = {
's', 'n', 'o', 'o', 'p', '\0', '\0', '\0'
};
/* "snoop" file header (minus magic number). */
struct snoop_hdr {
guint32 version; /* version number (should be 2) */
guint32 network; /* network type */
};
/* "snoop" record header. */
struct snooprec_hdr {
guint32 orig_len; /* actual length of packet */
guint32 incl_len; /* number of octets captured in file */
guint32 rec_len; /* length of record */
guint32 cum_drops; /* cumulative number of dropped packets */
guint32 ts_sec; /* timestamp seconds */
guint32 ts_usec; /* timestamp microseconds */
};
/*
* The link-layer header on ATM packets.
*/
struct snoop_atm_hdr {
guint8 flags; /* destination and traffic type */
guint8 vpi; /* VPI */
guint16 vci; /* VCI */
};
/*
* Extra information stuffed into the padding in Shomiti/Finisar Surveyor
* captures.
*/
struct shomiti_trailer {
guint16 phy_rx_length; /* length on the wire, including FCS? */
guint16 phy_rx_status; /* status flags */
guint32 ts_40_ns_lsb; /* 40 ns time stamp, low-order bytes? */
guint32 ts_40_ns_msb; /* 40 ns time stamp, low-order bytes? */
gint32 frame_id; /* "FrameID"? */
};
/*
* phy_rx_status flags.
*/
#define RX_STATUS_OVERFLOW 0x8000 /* overflow error */
#define RX_STATUS_BAD_CRC 0x4000 /* CRC error */
#define RX_STATUS_DRIBBLE_NIBBLE 0x2000 /* dribble/nibble bits? */
#define RX_STATUS_SHORT_FRAME 0x1000 /* frame < 64 bytes */
#define RX_STATUS_OVERSIZE_FRAME 0x0800 /* frame > 1518 bytes */
#define RX_STATUS_GOOD_FRAME 0x0400 /* frame OK */
#define RX_STATUS_N12_BYTES_RECEIVED 0x0200 /* first 12 bytes of frame received? */
#define RX_STATUS_RXABORT 0x0100 /* RXABORT during reception */
#define RX_STATUS_FIFO_ERROR 0x0080 /* receive FIFO error */
#define RX_STATUS_TRIGGERED 0x0001 /* frame did trigger */
static gboolean snoop_read(wtap *wth, int *err, gchar **err_info,
gint64 *data_offset);
static gboolean snoop_seek_read(wtap *wth, gint64 seek_off,
struct wtap_pkthdr *phdr, Buffer *buf, int *err, gchar **err_info);
static int snoop_read_packet(wtap *wth, FILE_T fh, struct wtap_pkthdr *phdr,
Buffer *buf, int *err, gchar **err_info);
static gboolean snoop_read_atm_pseudoheader(FILE_T fh,
union wtap_pseudo_header *pseudo_header, int *err, gchar **err_info);
static gboolean snoop_read_shomiti_wireless_pseudoheader(FILE_T fh,
union wtap_pseudo_header *pseudo_header, int *err, gchar **err_info,
int *header_size);
static gboolean snoop_dump(wtap_dumper *wdh, const struct wtap_pkthdr *phdr,
const guint8 *pd, int *err, gchar **err_info);
/*
* See
*
* http://www.opengroup.org/onlinepubs/9638599/apdxf.htm
*
* for the "dlpi.h" header file specified by The Open Group, which lists
* the DL_ values for various protocols; Solaris 7 uses the same values.
*
* See
*
* http://www.iana.org/assignments/snoop-datalink-types/snoop-datalink-types.xml
*
* for the IETF list of snoop datalink types.
*
* The page at
*
* http://mrpink.lerc.nasa.gov/118x/support.html
*
* had links to modified versions of "tcpdump" and "libpcap" for SUNatm
* DLPI support; they suggested that the 3.0 verson of SUNatm uses those
* values. The Wayback Machine archived that page, but not the stuff
* to which it linked, unfortunately.
*
* It also has a link to "convert.c", which is a program to convert files
* from the format written by the "atmsnoop" program that comes with the
* SunATM package to regular "snoop" format, claims that "SunATM 2.1 claimed
* to be DL_FDDI (don't ask why). SunATM 3.0 claims to be DL_IPATM, which
* is 0x12".
*
* It also says that "ATM Mac header is 12 bytes long.", and seems to imply
* that in an "atmsnoop" file, the header contains 2 bytes (direction and
* VPI?), 2 bytes of VCI, 6 bytes of something, and 2 bytes of Ethernet
* type; if those 6 bytes are 2 bytes of DSAP, 2 bytes of LSAP, 1 byte
* of LLC control, and 3 bytes of SNAP OUI, that'd mean that an ATM
* pseudo-header in an "atmsnoop" file is probably 1 byte of direction,
* 1 byte of VPI, and 2 bytes of VCI.
*
* The aforementioned page also has a link to some capture files from
* "atmsnoop"; this version of "snoop.c" appears to be able to read them.
*
* Source to an "atmdump" package, which includes a modified version of
* "libpcap" to handle SunATM DLPI and an ATM driver for FreeBSD, and
* also includes "atmdump", which is a modified "tcpdump", was available
* at
*
* ftp://ftp.cs.ndsu.nodak.edu/pub/freebsd/atm/atm-bpf.tgz
*
* (the host name is no longer valid) and that code also indicated that
* DL_IPATM is used, and that an ATM packet handed up from the Sun driver
* for the Sun SBus ATM card on Solaris 2.5.1 has 1 byte of direction,
* 1 byte of VPI, 2 bytes of VCI, and then the ATM PDU, and suggests that
* the direction flag is 0x80 for "transmitted" (presumably meaning
* DTE->DCE) and presumably not 0x80 for "received" (presumably meaning
* DCE->DTE). That code was used as the basis for the SunATM support in
* later versions of libpcap and tcpdump, and it worked at the time the
* development was done with the SunATM code on the system on which the
* development was done.
*
* In fact, the "direction" byte appears to have some other stuff, perhaps
* a traffic type, in the lower 7 bits, with the 8th bit indicating the
* direction. That appears to be the case.
*
* I don't know what the encapsulation of any of the other types is, so I
* leave them all as WTAP_ENCAP_UNKNOWN, except for those for which Brian
* Ginsbach has supplied information about the way UNICOS/mp uses them.
* I also don't know whether "snoop" can handle any of them (it presumably
* can't handle ATM, otherwise Sun wouldn't have supplied "atmsnoop"; even
* if it can't, this may be useful reference information for anybody doing
* code to use DLPI to do raw packet captures on those network types.
*
* http://web.archive.org/web/20010906213807/http://www.shomiti.com/support/TNCapFileFormat.htm
*
* gives information on Shomiti's mutant flavor of snoop. For some unknown
* reason, they decided not to just Go With The DLPI Flow, and instead used
* the types unspecified in RFC 1461 for their own nefarious purposes, such
* as distinguishing 10MB from 100MB from 1000MB Ethernet and distinguishing
* 4MB from 16MB Token Ring, and distinguishing both of them from the
* "Shomiti" versions of same.
*/
wtap_open_return_val snoop_open(wtap *wth, int *err, gchar **err_info)
{
char magic[sizeof snoop_magic];
struct snoop_hdr hdr;
struct snooprec_hdr rec_hdr;
guint padbytes;
gboolean is_shomiti;
static const int snoop_encap[] = {
WTAP_ENCAP_ETHERNET, /* IEEE 802.3 */
WTAP_ENCAP_UNKNOWN, /* IEEE 802.4 Token Bus */
WTAP_ENCAP_TOKEN_RING,
WTAP_ENCAP_UNKNOWN, /* IEEE 802.6 Metro Net */
WTAP_ENCAP_ETHERNET,
WTAP_ENCAP_UNKNOWN, /* HDLC */
WTAP_ENCAP_UNKNOWN, /* Character Synchronous, e.g. bisync */
WTAP_ENCAP_UNKNOWN, /* IBM Channel-to-Channel */
WTAP_ENCAP_FDDI_BITSWAPPED,
WTAP_ENCAP_NULL, /* Other */
WTAP_ENCAP_UNKNOWN, /* Frame Relay LAPF */
WTAP_ENCAP_UNKNOWN, /* Multi-protocol over Frame Relay */
WTAP_ENCAP_UNKNOWN, /* Character Async (e.g., SLIP and PPP?) */
WTAP_ENCAP_UNKNOWN, /* X.25 Classical IP */
WTAP_ENCAP_NULL, /* software loopback */
WTAP_ENCAP_UNKNOWN, /* not defined in "dlpi.h" */
WTAP_ENCAP_IP_OVER_FC, /* Fibre Channel */
WTAP_ENCAP_UNKNOWN, /* ATM */
WTAP_ENCAP_ATM_PDUS, /* ATM Classical IP */
WTAP_ENCAP_UNKNOWN, /* X.25 LAPB */
WTAP_ENCAP_UNKNOWN, /* ISDN */
WTAP_ENCAP_UNKNOWN, /* HIPPI */
WTAP_ENCAP_UNKNOWN, /* 100VG-AnyLAN Ethernet */
WTAP_ENCAP_UNKNOWN, /* 100VG-AnyLAN Token Ring */
WTAP_ENCAP_UNKNOWN, /* "ISO 8802/3 and Ethernet" */
WTAP_ENCAP_UNKNOWN, /* 100BaseT (but that's just Ethernet) */
WTAP_ENCAP_IP_OVER_IB_SNOOP, /* Infiniband */
};
#define NUM_SNOOP_ENCAPS (sizeof snoop_encap / sizeof snoop_encap[0])
#define SNOOP_PRIVATE_BIT 0x80000000
static const int snoop_private_encap[] = {
WTAP_ENCAP_UNKNOWN, /* Not Used */
WTAP_ENCAP_UNKNOWN, /* IPv4 Tunnel Link */
WTAP_ENCAP_UNKNOWN, /* IPv6 Tunnel Link */
WTAP_ENCAP_UNKNOWN, /* Virtual network interface */
WTAP_ENCAP_UNKNOWN, /* IEEE 802.11 */
WTAP_ENCAP_IPNET, /* ipnet(7D) link */
WTAP_ENCAP_UNKNOWN, /* IPMP stub interface */
WTAP_ENCAP_UNKNOWN, /* 6to4 Tunnel Link */
};
#define NUM_SNOOP_PRIVATE_ENCAPS (sizeof snoop_private_encap / sizeof snoop_private_encap[0])
static const int shomiti_encap[] = {
WTAP_ENCAP_ETHERNET, /* IEEE 802.3 */
WTAP_ENCAP_UNKNOWN, /* IEEE 802.4 Token Bus */
WTAP_ENCAP_TOKEN_RING,
WTAP_ENCAP_UNKNOWN, /* IEEE 802.6 Metro Net */
WTAP_ENCAP_ETHERNET,
WTAP_ENCAP_UNKNOWN, /* HDLC */
WTAP_ENCAP_UNKNOWN, /* Character Synchronous, e.g. bisync */
WTAP_ENCAP_UNKNOWN, /* IBM Channel-to-Channel */
WTAP_ENCAP_FDDI_BITSWAPPED,
WTAP_ENCAP_UNKNOWN, /* Other */
WTAP_ENCAP_ETHERNET, /* Fast Ethernet */
WTAP_ENCAP_TOKEN_RING, /* 4MB 802.5 token ring */
WTAP_ENCAP_ETHERNET, /* Gigabit Ethernet */
WTAP_ENCAP_TOKEN_RING, /* "IEEE 802.5 Shomiti" */
WTAP_ENCAP_TOKEN_RING, /* "4MB IEEE 802.5 Shomiti" */
WTAP_ENCAP_UNKNOWN, /* Other */
WTAP_ENCAP_UNKNOWN, /* Other */
WTAP_ENCAP_UNKNOWN, /* Other */
WTAP_ENCAP_IEEE_802_11_WITH_RADIO, /* IEEE 802.11 with Radio Header */
WTAP_ENCAP_ETHERNET, /* 10 Gigabit Ethernet */
};
#define NUM_SHOMITI_ENCAPS (sizeof shomiti_encap / sizeof shomiti_encap[0])
int file_encap;
gint64 saved_offset;
/* Read in the string that should be at the start of a "snoop" file */
if (!wtap_read_bytes(wth->fh, magic, sizeof magic, err, err_info)) {
if (*err != WTAP_ERR_SHORT_READ)
return WTAP_OPEN_ERROR;
return WTAP_OPEN_NOT_MINE;
}
if (memcmp(magic, snoop_magic, sizeof snoop_magic) != 0) {
return WTAP_OPEN_NOT_MINE;
}
/* Read the rest of the header. */
if (!wtap_read_bytes(wth->fh, &hdr, sizeof hdr, err, err_info))
return WTAP_OPEN_ERROR;
/*
* Make sure it's a version we support.
*/
hdr.version = g_ntohl(hdr.version);
switch (hdr.version) {
case 2: /* Solaris 2.x and later snoop, and Shomiti
Surveyor prior to 3.0, or 3.0 and later
with NDIS card */
case 3: /* Surveyor 3.0 and later, with Shomiti CMM2 hardware */
case 4: /* Surveyor 3.0 and later, with Shomiti GAM hardware */
case 5: /* Surveyor 3.0 and later, with Shomiti THG hardware */
break;
default:
*err = WTAP_ERR_UNSUPPORTED;
*err_info = g_strdup_printf("snoop: version %u unsupported", hdr.version);
return WTAP_OPEN_ERROR;
}
/*
* Oh, this is lovely.
*
* I suppose Shomiti could give a bunch of lawyerly noise about
* how "well, RFC 1761 said they were unassigned, and that's
* the standard, not the DLPI header file, so it's perfectly OK
* for us to use them, blah blah blah", but it's still irritating
* as hell that they used the unassigned-in-RFC-1761 values for
* their own purposes - especially given that Sun also used
* one of them in atmsnoop.
*
* We can't determine whether it's a Shomiti capture based on
* the version number, as, according to their documentation on
* their capture file format, Shomiti uses a version number of 2
* if the data "was captured using an NDIS card", which presumably
* means "captured with an ordinary boring network card via NDIS"
* as opposed to "captured with our whizzo special capture
* hardware".
*
* The only way I can see to determine that is to check how much
* padding there is in the first packet - if there's enough
* padding for a Shomiti trailer, it's probably a Shomiti
* capture, and otherwise, it's probably from Snoop.
*/
/*
* Start out assuming it's not a Shomiti capture.
*/
is_shomiti = FALSE;
/* Read first record header. */
saved_offset = file_tell(wth->fh);
if (!wtap_read_bytes_or_eof(wth->fh, &rec_hdr, sizeof rec_hdr, err, err_info)) {
if (*err != 0)
return WTAP_OPEN_ERROR;
/*
* The file ends after the record header, which means this
* is a capture with no packets.
*
* We assume it's a snoop file; the actual type of file is
* irrelevant, as there are no records in it, and thus no
* extra information if it's a Shomiti capture, and no
* link-layer headers whose type we have to know, and no
* Ethernet frames that might have an FCS.
*/
} else {
/*
* Compute the number of bytes of padding in the
* record. If it's at least the size of a Shomiti
* trailer record, we assume this is a Shomiti
* capture. (Some atmsnoop captures appear
* to have 4 bytes of padding, and at least one
* snoop capture appears to have 6 bytes of padding;
* the Shomiti header is larger than either of those.)
*/
if (g_ntohl(rec_hdr.rec_len) >
(sizeof rec_hdr + g_ntohl(rec_hdr.incl_len))) {
/*
* Well, we have padding; how much?
*/
padbytes = g_ntohl(rec_hdr.rec_len) -
((guint)sizeof rec_hdr + g_ntohl(rec_hdr.incl_len));
/*
* Is it at least the size of a Shomiti trailer?
*/
is_shomiti =
(padbytes >= sizeof (struct shomiti_trailer));
}
}
/*
* Seek back to the beginning of the first record.
*/
if (file_seek(wth->fh, saved_offset, SEEK_SET, err) == -1)
return WTAP_OPEN_ERROR;
hdr.network = g_ntohl(hdr.network);
if (is_shomiti) {
if (hdr.network >= NUM_SHOMITI_ENCAPS
|| shomiti_encap[hdr.network] == WTAP_ENCAP_UNKNOWN) {
*err = WTAP_ERR_UNSUPPORTED;
*err_info = g_strdup_printf("snoop: Shomiti network type %u unknown or unsupported",
hdr.network);
return WTAP_OPEN_ERROR;
}
file_encap = shomiti_encap[hdr.network];
/* This is a Shomiti file */
wth->file_type_subtype = WTAP_FILE_TYPE_SUBTYPE_SHOMITI;
} else if (hdr.network & SNOOP_PRIVATE_BIT) {
if ((hdr.network^SNOOP_PRIVATE_BIT) >= NUM_SNOOP_PRIVATE_ENCAPS
|| snoop_private_encap[hdr.network^SNOOP_PRIVATE_BIT] == WTAP_ENCAP_UNKNOWN) {
*err = WTAP_ERR_UNSUPPORTED;
*err_info = g_strdup_printf("snoop: private network type %u unknown or unsupported",
hdr.network);
return WTAP_OPEN_ERROR;
}
file_encap = snoop_private_encap[hdr.network^SNOOP_PRIVATE_BIT];
/* This is a snoop file */
wth->file_type_subtype = WTAP_FILE_TYPE_SUBTYPE_SNOOP;
} else {
if (hdr.network >= NUM_SNOOP_ENCAPS
|| snoop_encap[hdr.network] == WTAP_ENCAP_UNKNOWN) {
*err = WTAP_ERR_UNSUPPORTED;
*err_info = g_strdup_printf("snoop: network type %u unknown or unsupported",
hdr.network);
return WTAP_OPEN_ERROR;
}
file_encap = snoop_encap[hdr.network];
/* This is a snoop file */
wth->file_type_subtype = WTAP_FILE_TYPE_SUBTYPE_SNOOP;
}
/*
* We don't currently use the extra information in Shomiti
* records, so we use the same routines to read snoop and
* Shomiti files.
*/
wth->subtype_read = snoop_read;
wth->subtype_seek_read = snoop_seek_read;
wth->file_encap = file_encap;
wth->snapshot_length = 0; /* not available in header */
wth->file_tsprec = WTAP_TSPREC_USEC;
return WTAP_OPEN_MINE;
}
typedef struct {
guint8 pad[4];
guint8 undecrypt[2];
guint8 rate;
guint8 preamble;
guint8 code;
guint8 signal;
guint8 qual;
guint8 channel;
} shomiti_wireless_header;
/* Read the next packet */
static gboolean snoop_read(wtap *wth, int *err, gchar **err_info,
gint64 *data_offset)
{
int padbytes;
*data_offset = file_tell(wth->fh);
padbytes = snoop_read_packet(wth, wth->fh, &wth->phdr,
wth->frame_buffer, err, err_info);
if (padbytes == -1)
return FALSE;
/*
* Skip over the padding, if any.
*/
if (padbytes != 0) {
if (!file_skip(wth->fh, padbytes, err))
return FALSE;
}
return TRUE;
}
static gboolean
snoop_seek_read(wtap *wth, gint64 seek_off,
struct wtap_pkthdr *phdr, Buffer *buf, int *err, gchar **err_info)
{
if (file_seek(wth->random_fh, seek_off, SEEK_SET, err) == -1)
return FALSE;
if (snoop_read_packet(wth, wth->random_fh, phdr, buf, err, err_info) == -1) {
if (*err == 0)
*err = WTAP_ERR_SHORT_READ;
return FALSE;
}
return TRUE;
}
static int
snoop_read_packet(wtap *wth, FILE_T fh, struct wtap_pkthdr *phdr,
Buffer *buf, int *err, gchar **err_info)
{
struct snooprec_hdr hdr;
guint32 rec_size;
guint32 packet_size;
guint32 orig_size;
int header_size;
/* Read record header. */
if (!wtap_read_bytes_or_eof(fh, &hdr, sizeof hdr, err, err_info))
return -1;
rec_size = g_ntohl(hdr.rec_len);
orig_size = g_ntohl(hdr.orig_len);
packet_size = g_ntohl(hdr.incl_len);
if (orig_size > WTAP_MAX_PACKET_SIZE) {
/*
* Probably a corrupt capture file; don't blow up trying
* to allocate space for an immensely-large packet.
*/
*err = WTAP_ERR_BAD_FILE;
*err_info = g_strdup_printf("snoop: File has %u-byte original length, bigger than maximum of %u",
orig_size, WTAP_MAX_PACKET_SIZE);
return -1;
}
if (packet_size > WTAP_MAX_PACKET_SIZE) {
/*
* Probably a corrupt capture file; don't blow up trying
* to allocate space for an immensely-large packet.
*/
*err = WTAP_ERR_BAD_FILE;
*err_info = g_strdup_printf("snoop: File has %u-byte packet, bigger than maximum of %u",
packet_size, WTAP_MAX_PACKET_SIZE);
return -1;
}
if (packet_size > rec_size) {
/*
* Probably a corrupt capture file.
*/
*err = WTAP_ERR_BAD_FILE;
*err_info = g_strdup_printf("snoop: File has %u-byte packet, bigger than record size %u",
packet_size, rec_size);
return -1;
}
switch (wth->file_encap) {
case WTAP_ENCAP_ATM_PDUS:
/*
* This is an ATM packet, so the first four bytes are
* the direction of the packet (transmit/receive), the
* VPI, and the VCI; read them and generate the
* pseudo-header from them.
*/
if (packet_size < sizeof (struct snoop_atm_hdr)) {
/*
* Uh-oh, the packet isn't big enough to even
* have a pseudo-header.
*/
*err = WTAP_ERR_BAD_FILE;
*err_info = g_strdup_printf("snoop: atmsnoop file has a %u-byte packet, too small to have even an ATM pseudo-header",
packet_size);
return -1;
}
if (!snoop_read_atm_pseudoheader(fh, &phdr->pseudo_header,
err, err_info))
return -1; /* Read error */
/*
* Don't count the pseudo-header as part of the packet.
*/
rec_size -= (guint32)sizeof (struct snoop_atm_hdr);
orig_size -= (guint32)sizeof (struct snoop_atm_hdr);
packet_size -= (guint32)sizeof (struct snoop_atm_hdr);
break;
case WTAP_ENCAP_ETHERNET:
/*
* If this is a snoop file, we assume there's no FCS in
* this frame; if this is a Shomit file, we assume there
* is. (XXX - or should we treat it a "maybe"?)
*/
if (wth->file_type_subtype == WTAP_FILE_TYPE_SUBTYPE_SHOMITI)
phdr->pseudo_header.eth.fcs_len = 4;
else
phdr->pseudo_header.eth.fcs_len = 0;
break;
case WTAP_ENCAP_IEEE_802_11_WITH_RADIO:
if (packet_size < sizeof (shomiti_wireless_header)) {
/*
* Uh-oh, the packet isn't big enough to even
* have a pseudo-header.
*/
*err = WTAP_ERR_BAD_FILE;
*err_info = g_strdup_printf("snoop: Shomiti wireless file has a %u-byte packet, too small to have even a wireless pseudo-header",
packet_size);
return -1;
}
if (!snoop_read_shomiti_wireless_pseudoheader(fh,
&phdr->pseudo_header, err, err_info, &header_size))
return -1; /* Read error */
/*
* Don't count the pseudo-header as part of the packet.
*/
rec_size -= header_size;
orig_size -= header_size;
packet_size -= header_size;
break;
}
phdr->rec_type = REC_TYPE_PACKET;
phdr->presence_flags = WTAP_HAS_TS|WTAP_HAS_CAP_LEN;
phdr->ts.secs = g_ntohl(hdr.ts_sec);
phdr->ts.nsecs = g_ntohl(hdr.ts_usec) * 1000;
phdr->caplen = packet_size;
phdr->len = orig_size;
if (rec_size < (sizeof hdr + packet_size)) {
/*
* What, *negative* padding? Bogus.
*/
*err = WTAP_ERR_BAD_FILE;
*err_info = g_strdup_printf("snoop: File has %u-byte record with packet size of %u",
rec_size, packet_size);
return -1;
}
/*
* Read the packet data.
*/
if (!wtap_read_packet_bytes(fh, buf, packet_size, err, err_info))
return -1; /* 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_PDUS &&
phdr->pseudo_header.atm.type == TRAF_LANE) {
atm_guess_lane_type(phdr, ws_buffer_start_ptr(buf));
}
return rec_size - ((guint)sizeof hdr + packet_size);
}
static gboolean
snoop_read_atm_pseudoheader(FILE_T fh, union wtap_pseudo_header *pseudo_header,
int *err, gchar **err_info)
{
struct snoop_atm_hdr atm_phdr;
guint8 vpi;
guint16 vci;
if (!wtap_read_bytes(fh, &atm_phdr, sizeof atm_phdr, err, err_info))
return FALSE;
vpi = atm_phdr.vpi;
vci = pntoh16(&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) ? 0 : 1;
/* We don't have this information */
pseudo_header->atm.flags = 0;
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_shomiti_wireless_pseudoheader(FILE_T fh,
union wtap_pseudo_header *pseudo_header, int *err, gchar **err_info,
int *header_size)
{
shomiti_wireless_header whdr;
int rsize;
if (!wtap_read_bytes(fh, &whdr, sizeof whdr, err, err_info))
return FALSE;
/* the 4th byte of the pad is actually a header length,
* we've already read 8 bytes of it, and it must never
* be less than 8.
*
* XXX - presumably that means that the header length
* doesn't include the length field, as we've read
* 12 bytes total.
*
* XXX - what's in the other 3 bytes of the padding? Is it a
* 4-byte length field?
* XXX - is there anything in the rest of the header of interest?
* XXX - are there any files where the header is shorter than
* 4 bytes of length plus 8 bytes of information?
*/
if (whdr.pad[3] < 8) {
*err = WTAP_ERR_BAD_FILE;
*err_info = g_strdup_printf("snoop: Header length in Surveyor record is %u, less than minimum of 8",
whdr.pad[3]);
return FALSE;
}
/* Skip the header. */
rsize = ((int) whdr.pad[3]) - 8;
if (file_seek(fh, rsize, SEEK_CUR, err) == -1)
return FALSE;
memset(&pseudo_header->ieee_802_11, 0, sizeof(pseudo_header->ieee_802_11));
pseudo_header->ieee_802_11.fcs_len = 4;
pseudo_header->ieee_802_11.decrypted = FALSE;
pseudo_header->ieee_802_11.datapad = FALSE;
pseudo_header->ieee_802_11.phy = PHDR_802_11_PHY_UNKNOWN;
pseudo_header->ieee_802_11.has_channel = TRUE;
pseudo_header->ieee_802_11.channel = whdr.channel;
pseudo_header->ieee_802_11.has_data_rate = TRUE;
pseudo_header->ieee_802_11.data_rate = whdr.rate;
pseudo_header->ieee_802_11.has_signal_percent = TRUE;
pseudo_header->ieee_802_11.signal_percent = whdr.signal;
/* add back the header and don't forget the pad as well */
*header_size = rsize + 8 + 4;
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_ARCNET_LINUX -> unsupported */
-1, /* WTAP_ENCAP_ATM_RFC1483 -> unsupported */
-1, /* WTAP_ENCAP_LINUX_ATM_CLIP -> unsupported */
-1, /* WTAP_ENCAP_LAPB -> unsupported*/
0x12, /* WTAP_ENCAP_ATM_PDUS -> DL_IPATM */
};
#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_UNWRITABLE_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, int *err)
{
struct snoop_hdr file_hdr;
/* This is a snoop file */
wdh->subtype_write = snoop_dump;
/* Write the file header. */
if (!wtap_dump_file_write(wdh, &snoop_magic, sizeof snoop_magic, err))
return FALSE;
/* current "snoop" format is 2 */
file_hdr.version = g_htonl(2);
file_hdr.network = g_htonl(wtap_encap[wdh->encap]);
if (!wtap_dump_file_write(wdh, &file_hdr, sizeof file_hdr, err))
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 guint8 *pd, int *err, gchar **err_info _U_)
{
const union wtap_pseudo_header *pseudo_header = &phdr->pseudo_header;
struct snooprec_hdr rec_hdr;
int reclen;
guint padlen;
static const char zeroes[4] = {0};
struct snoop_atm_hdr atm_hdr;
int atm_hdrsize;
/* We can only write packet records. */
if (phdr->rec_type != REC_TYPE_PACKET) {
*err = WTAP_ERR_UNWRITABLE_REC_TYPE;
return FALSE;
}
if (wdh->encap == WTAP_ENCAP_ATM_PDUS)
atm_hdrsize = sizeof (struct snoop_atm_hdr);
else
atm_hdrsize = 0;
/* Record length = header length plus data length... */
reclen = (int)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;
/* Don't write anything we're not willing to read. */
if (phdr->caplen + atm_hdrsize > WTAP_MAX_PACKET_SIZE) {
*err = WTAP_ERR_PACKET_TOO_LARGE;
return FALSE;
}
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.secs);
rec_hdr.ts_usec = g_htonl(phdr->ts.nsecs / 1000);
if (!wtap_dump_file_write(wdh, &rec_hdr, sizeof rec_hdr, err))
return FALSE;
if (wdh->encap == WTAP_ENCAP_ATM_PDUS) {
/*
* 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 = (guint8) pseudo_header->atm.vpi;
atm_hdr.vci = g_htons(pseudo_header->atm.vci);
if (!wtap_dump_file_write(wdh, &atm_hdr, sizeof atm_hdr, err))
return FALSE;
}
if (!wtap_dump_file_write(wdh, pd, phdr->caplen, err))
return FALSE;
/* Now write the padding. */
if (!wtap_dump_file_write(wdh, zeroes, padlen, err))
return FALSE;
return TRUE;
}
/*
* Editor modelines - http://www.wireshark.org/tools/modelines.html
*
* Local variables:
* c-basic-offset: 8
* tab-width: 8
* indent-tabs-mode: t
* End:
*
* vi: set shiftwidth=8 tabstop=8 noexpandtab:
* :indentSize=8:tabSize=8:noTabs=false:
*/