/* radcom.c
*
- * $Id: radcom.c,v 1.37 2002/06/07 07:27:35 guy Exp $
+ * $Id$
*
* 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., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
char usec[4];
};
-static guint8 radcom_magic[8] = {
+/* Found at the beginning of the file. Bytes 2 and 3 (D2:00) seem to be
+ * different in some captures */
+static const guint8 radcom_magic[8] = {
0x42, 0xD2, 0x00, 0x34, 0x12, 0x66, 0x22, 0x88
};
+static const guint8 encap_magic[4] = {
+ 0x00, 0x42, 0x43, 0x09
+};
+
+static const guint8 active_time_magic[11] = {
+ 0x41, 0x63, 0x74, 0x69, 0x76, 0x65, 0x20, 0x54, 0x69, 0x6d, 0x65
+};
+
/* RADCOM record header - followed by frame data (perhaps including FCS).
- The first two bytes of "xxz" appear to equal "length", as do the
- second two bytes; if a RADCOM box can be told not to save all of
- the captured packet, might one or the other of those be the
- captured length of the packet? */
+
+ "data_length" appears to be the length of packet data following
+ the record header. It's 0 in the last record.
+
+ "length" appears to be the amount of captured packet data, and
+ "real_length" might be the actual length of the frame on the wire -
+ in some captures, it's the same as "length", and, in others,
+ it's greater than "length". In the last record, however, those
+ may have bogus values (or is that some kind of trailer record?).
+
+ "xxx" appears to be all-zero in all but the last record in one
+ capture; if so, perhaps this indicates that the last record is,
+ in fact, a trailer of some sort, and some field in the header
+ is a record type. */
struct radcomrec_hdr {
char xxx[4]; /* unknown */
- char length[2]; /* packet length */
+ char data_length[2]; /* packet length? */
char xxy[5]; /* unknown */
struct unaligned_frame_date date; /* date/time stamp of packet */
- char xxz[6]; /* unknown */
+ char real_length[2]; /* actual length of packet */
+ char length[2]; /* captured length of packet */
+ char xxz[2]; /* unknown */
char dce; /* DCE/DTE flag (and other flags?) */
char xxw[9]; /* unknown */
};
-static gboolean radcom_read(wtap *wth, int *err, long *data_offset);
-static gboolean radcom_seek_read(wtap *wth, long seek_off,
- union wtap_pseudo_header *pseudo_header, u_char *pd, int length,
- int *err);
+static gboolean radcom_read(wtap *wth, int *err, gchar **err_info,
+ gint64 *data_offset);
+static gboolean radcom_seek_read(wtap *wth, gint64 seek_off,
+ union wtap_pseudo_header *pseudo_header, guchar *pd, int length,
+ int *err, gchar **err_info);
static int radcom_read_rec_header(FILE_T fh, struct radcomrec_hdr *hdr,
int *err);
-static gboolean radcom_read_rec_data(FILE_T fh, u_char *pd, int length,
+static gboolean radcom_read_rec_data(FILE_T fh, guchar *pd, int length,
int *err);
-int radcom_open(wtap *wth, int *err)
+int radcom_open(wtap *wth, int *err, gchar **err_info)
{
int bytes_read;
- char magic[8];
+ guint8 r_magic[8], t_magic[11], search_encap[7];
struct frame_date start_date;
guint32 sec;
struct tm tm;
- char byte;
- char encap_magic[4] = {0x00, 0x42, 0x43, 0x09};
- char search_encap[7];
/* Read in the string that should be at the start of a RADCOM file */
errno = WTAP_ERR_CANT_READ;
- bytes_read = file_read(magic, 1, 8, wth->fh);
+ bytes_read = file_read(r_magic, 1, 8, wth->fh);
if (bytes_read != 8) {
*err = file_error(wth->fh);
if (*err != 0)
return 0;
}
- if (memcmp(magic, radcom_magic, 8) != 0) {
+ /* XXX: bytes 2 and 3 of the "magic" header seem to be different in some
+ * captures. We force them to our standard value so that the test
+ * succeeds (until we find if they have a special meaning, perhaps a
+ * version number ?) */
+ r_magic[1] = 0xD2;
+ r_magic[2] = 0x00;
+ if (memcmp(r_magic, radcom_magic, 8) != 0) {
return 0;
}
- if (file_seek(wth->fh, 0x8B, SEEK_SET, err) == -1)
- return -1;
- wth->data_offset = 0x8B;
+ /* Look for the "Active Time" string. The "frame_date" structure should
+ * be located 32 bytes before the beginning of this string */
+ wth->data_offset = 8;
errno = WTAP_ERR_CANT_READ;
- bytes_read = file_read(&byte, 1, 1, wth->fh);
- if (bytes_read != 1) {
+ bytes_read = file_read(t_magic, 1, 11, wth->fh);
+ if (bytes_read != 11) {
*err = file_error(wth->fh);
if (*err != 0)
return -1;
return 0;
}
- wth->data_offset += 1;
- while (byte) {
- errno = WTAP_ERR_CANT_READ;
- bytes_read = file_read(&byte, 1, 1, wth->fh);
- if (bytes_read != 1) {
- *err = file_error(wth->fh);
- if (*err != 0)
- return -1;
- return 0;
- }
- wth->data_offset += 1;
- }
+ while (memcmp(t_magic, active_time_magic, 11) != 0)
+ {
+ if (file_seek(wth->fh, -10, SEEK_CUR, err) == -1)
+ return -1;
+ wth->data_offset += 1;
+ errno = WTAP_ERR_CANT_READ;
+ bytes_read = file_read(t_magic, 1, 11, wth->fh);
+ if (bytes_read != 11) {
+ *err = file_error(wth->fh);
+ if (*err != 0)
+ return -1;
+ return 0;
+ }
+ }
+ if (file_seek(wth->fh, -43, SEEK_CUR, err) == -1) return -1;
+ wth->data_offset -= 32;
/* Get capture start time */
errno = WTAP_ERR_CANT_READ;
- bytes_read = file_read(&start_date, 1, sizeof(struct frame_date), wth->fh);
+ bytes_read = file_read(&start_date, 1, sizeof(struct frame_date),
+ wth->fh);
if (bytes_read != sizeof(struct frame_date)) {
*err = file_error(wth->fh);
if (*err != 0)
wth->file_type = WTAP_FILE_RADCOM;
wth->subtype_read = radcom_read;
wth->subtype_seek_read = radcom_seek_read;
- wth->snapshot_length = 0; /* not available in header, only in frame */
+ wth->snapshot_length = 0; /* not available in header, only in frame */
+ wth->tsprecision = WTAP_FILE_TSPREC_USEC;
tm.tm_year = pletohs(&start_date.year)-1900;
tm.tm_mon = start_date.month-1;
goto read_error;
}
wth->data_offset += 4;
- if (!memcmp(search_encap, "LAPB", 4))
+ if (memcmp(search_encap, "LAPB", 4) == 0)
wth->file_encap = WTAP_ENCAP_LAPB;
- else if (!memcmp(search_encap, "Ethe", 4))
+ else if (memcmp(search_encap, "Ethe", 4) == 0)
wth->file_encap = WTAP_ENCAP_ETHERNET;
+ else if (memcmp(search_encap, "ATM/", 4) == 0)
+ wth->file_encap = WTAP_ENCAP_ATM_RFC1483;
else {
- g_message("pcap: network type \"%.4s\" unknown", search_encap);
*err = WTAP_ERR_UNSUPPORTED_ENCAP;
+ *err_info = g_strdup_printf("radcom: network type \"%.4s\" unknown", search_encap);
return -1;
}
if (file_seek(wth->fh, 297, SEEK_CUR, err) == -1)
return -1;
wth->data_offset += 297;
+ } else if (wth->file_encap == WTAP_ENCAP_ATM_RFC1483) {
+ if (file_seek(wth->fh, 504, SEEK_CUR, err) == -1)
+ return -1;
+ wth->data_offset += 504;
}
return 1;
}
/* Read the next packet */
-static gboolean radcom_read(wtap *wth, int *err, long *data_offset)
+static gboolean radcom_read(wtap *wth, int *err, gchar **err_info _U_,
+ gint64 *data_offset)
{
int ret;
struct radcomrec_hdr hdr;
- guint16 length;
+ guint16 data_length, real_length, length;
guint32 sec;
int bytes_read;
struct tm tm;
+ guchar phdr[8];
char fcs[2];
/* Read record header. */
return FALSE;
}
wth->data_offset += sizeof hdr;
+ data_length = pletohs(&hdr.data_length);
+ if (data_length == 0) {
+ /*
+ * The last record appears to have 0 in its "data_length"
+ * field, but non-zero values in other fields, so we
+ * check for that and treat it as an EOF indication.
+ */
+ *err = 0;
+ return FALSE;
+ }
length = pletohs(&hdr.length);
- if (length == 0) return FALSE;
+ real_length = pletohs(&hdr.real_length);
- if (wth->file_encap == WTAP_ENCAP_LAPB)
+ if (wth->file_encap == WTAP_ENCAP_LAPB) {
length -= 2; /* FCS */
+ real_length -= 2;
+ }
- wth->phdr.len = length;
+ wth->phdr.len = real_length;
wth->phdr.caplen = length;
tm.tm_year = pletohs(&hdr.date.year)-1900;
- tm.tm_mon = hdr.date.month-1;
+ tm.tm_mon = (hdr.date.month&0x0f)-1;
tm.tm_mday = hdr.date.day;
sec = pletohl(&hdr.date.sec);
tm.tm_hour = sec/3600;
tm.tm_min = (sec%3600)/60;
tm.tm_sec = sec%60;
tm.tm_isdst = -1;
- wth->phdr.ts.tv_sec = mktime(&tm);
- wth->phdr.ts.tv_usec = pletohl(&hdr.date.usec);
- wth->pseudo_header.x25.flags = (hdr.dce & 0x1) ? 0x00 : FROM_DCE;
+ wth->phdr.ts.secs = mktime(&tm);
+ wth->phdr.ts.nsecs = pletohl(&hdr.date.usec) * 1000;
+
+ switch (wth->file_encap) {
+
+ case WTAP_ENCAP_ETHERNET:
+ /* XXX - is there an FCS? */
+ wth->pseudo_header.eth.fcs_len = -1;
+ break;
+
+ case WTAP_ENCAP_LAPB:
+ wth->pseudo_header.x25.flags = (hdr.dce & 0x1) ?
+ 0x00 : FROM_DCE;
+ break;
+
+ case WTAP_ENCAP_ATM_RFC1483:
+ /*
+ * XXX - is this stuff a pseudo-header?
+ * The direction appears to be in the "hdr.dce" field.
+ */
+ if (!radcom_read_rec_data(wth->fh, phdr, sizeof phdr, err))
+ return FALSE; /* Read error */
+ wth->data_offset += 8;
+ length -= 8;
+ wth->phdr.len -= 8;
+ wth->phdr.caplen -= 8;
+ break;
+ }
/*
* Read the packet data.
return FALSE; /* Read error */
wth->data_offset += length;
- wth->phdr.pkt_encap = wth->file_encap;
-
if (wth->file_encap == WTAP_ENCAP_LAPB) {
/* Read the FCS.
- XXX - should we put it in the pseudo-header? */
+ XXX - should we have some way of indicating the
+ presence and size of an FCS to our caller?
+ That'd let us handle other file types as well. */
errno = WTAP_ERR_CANT_READ;
bytes_read = file_read(&fcs, 1, sizeof fcs, wth->fh);
if (bytes_read != sizeof fcs) {
}
static gboolean
-radcom_seek_read(wtap *wth, long seek_off,
- union wtap_pseudo_header *pseudo_header, u_char *pd, int length, int *err)
+radcom_seek_read(wtap *wth, gint64 seek_off,
+ union wtap_pseudo_header *pseudo_header, guchar *pd, int length,
+ int *err, gchar **err_info _U_)
{
int ret;
struct radcomrec_hdr hdr;
+ guchar phdr[8];
if (file_seek(wth->random_fh, seek_off, SEEK_SET, err) == -1)
return FALSE;
return FALSE;
}
- pseudo_header->x25.flags = (hdr.dce & 0x1) ? 0x00 : FROM_DCE;
+ switch (wth->file_encap) {
+
+ case WTAP_ENCAP_ETHERNET:
+ /* XXX - is there an FCS? */
+ pseudo_header->eth.fcs_len = -1;
+ break;
+
+ case WTAP_ENCAP_LAPB:
+ pseudo_header->x25.flags = (hdr.dce & 0x1) ? 0x00 : FROM_DCE;
+ break;
+
+ case WTAP_ENCAP_ATM_RFC1483:
+ /*
+ * XXX - is this stuff a pseudo-header?
+ * The direction appears to be in the "hdr.dce" field.
+ */
+ if (!radcom_read_rec_data(wth->random_fh, phdr, sizeof phdr,
+ err))
+ return FALSE; /* Read error */
+ break;
+ }
/*
* Read the packet data.
}
static gboolean
-radcom_read_rec_data(FILE_T fh, u_char *pd, int length, int *err)
+radcom_read_rec_data(FILE_T fh, guchar *pd, int length, int *err)
{
int bytes_read;
git.samba.org / obnox / wireshark / wip.git / blobdiff