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-rw-r--r--wiretap/radcom.c411
1 files changed, 411 insertions, 0 deletions
diff --git a/wiretap/radcom.c b/wiretap/radcom.c
new file mode 100644
index 00000000..6e6c5963
--- /dev/null
+++ b/wiretap/radcom.c
@@ -0,0 +1,411 @@
+/* radcom.c
+ *
+ * Wiretap Library
+ * Copyright (c) 1998 by Gilbert Ramirez <gram@alumni.rice.edu>
+ *
+ * SPDX-License-Identifier: GPL-2.0-or-later
+ */
+
+#include "config.h"
+
+#include <string.h>
+#include "wtap-int.h"
+#include "file_wrappers.h"
+#include "radcom.h"
+
+struct frame_date {
+ guint16 year;
+ guint8 month;
+ guint8 day;
+ guint32 sec; /* seconds since midnight */
+ guint32 usec;
+};
+
+struct unaligned_frame_date {
+ char year[2];
+ char month;
+ char day;
+ char sec[4]; /* seconds since midnight */
+ char usec[4];
+};
+
+/* 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] = {
+ 'A', 'c', 't', 'i', 'v', 'e', ' ', 'T', 'i', 'm', 'e'
+};
+
+/* RADCOM record header - followed by frame data (perhaps including FCS).
+
+ "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 data_length[2]; /* packet length? */
+ char xxy[5]; /* unknown */
+ struct unaligned_frame_date date; /* date/time stamp of packet */
+ 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, wtap_rec *rec, Buffer *buf,
+ int *err, gchar **err_info, gint64 *data_offset);
+static gboolean radcom_seek_read(wtap *wth, gint64 seek_off,
+ wtap_rec *rec, Buffer *buf, int *err, gchar **err_info);
+static gboolean radcom_read_rec(wtap *wth, FILE_T fh, wtap_rec *rec,
+ Buffer *buf, int *err, gchar **err_info);
+
+static int radcom_file_type_subtype = -1;
+
+void register_radcom(void);
+
+wtap_open_return_val radcom_open(wtap *wth, int *err, gchar **err_info)
+{
+ guint8 r_magic[8], t_magic[11], search_encap[7];
+ struct frame_date start_date;
+#if 0
+ guint32 sec;
+ struct tm tm;
+#endif
+
+ /* Read in the string that should be at the start of a RADCOM file */
+ if (!wtap_read_bytes(wth->fh, r_magic, 8, err, err_info)) {
+ if (*err != WTAP_ERR_SHORT_READ)
+ return WTAP_OPEN_ERROR;
+ return WTAP_OPEN_NOT_MINE;
+ }
+
+ /* 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 WTAP_OPEN_NOT_MINE;
+ }
+
+ /* Look for the "Active Time" string. The "frame_date" structure should
+ * be located 32 bytes before the beginning of this string */
+ if (!wtap_read_bytes(wth->fh, t_magic, 11, err, err_info)) {
+ if (*err != WTAP_ERR_SHORT_READ)
+ return WTAP_OPEN_ERROR;
+ return WTAP_OPEN_NOT_MINE;
+ }
+ while (memcmp(t_magic, active_time_magic, 11) != 0)
+ {
+ if (file_seek(wth->fh, -10, SEEK_CUR, err) == -1)
+ return WTAP_OPEN_ERROR;
+ if (!wtap_read_bytes(wth->fh, t_magic, 11, err, err_info)) {
+ if (*err != WTAP_ERR_SHORT_READ)
+ return WTAP_OPEN_ERROR;
+ return WTAP_OPEN_NOT_MINE;
+ }
+ }
+ if (file_seek(wth->fh, -43, SEEK_CUR, err) == -1)
+ return WTAP_OPEN_ERROR;
+
+ /* Get capture start time */
+ if (!wtap_read_bytes(wth->fh, &start_date, sizeof(struct frame_date),
+ err, err_info)) {
+ if (*err != WTAP_ERR_SHORT_READ)
+ return WTAP_OPEN_ERROR;
+ return WTAP_OPEN_NOT_MINE;
+ }
+
+ /* So what time is this? */
+ if (!wtap_read_bytes(wth->fh, NULL, sizeof(struct frame_date),
+ err, err_info)) {
+ if (*err != WTAP_ERR_SHORT_READ)
+ return WTAP_OPEN_ERROR;
+ return WTAP_OPEN_NOT_MINE;
+ }
+
+ for (;;) {
+ if (!wtap_read_bytes(wth->fh, search_encap, 4,
+ err, err_info)) {
+ if (*err != WTAP_ERR_SHORT_READ)
+ return WTAP_OPEN_ERROR;
+ return WTAP_OPEN_NOT_MINE;
+ }
+
+ if (memcmp(encap_magic, search_encap, 4) == 0)
+ break;
+
+ /*
+ * OK, that's not it, go forward 1 byte - reading
+ * the magic moved us forward 4 bytes, so seeking
+ * backward 3 bytes moves forward 1 byte - and
+ * try the 4 bytes at that offset.
+ */
+ if (file_seek(wth->fh, -3, SEEK_CUR, err) == -1)
+ return WTAP_OPEN_ERROR;
+ }
+ if (!wtap_read_bytes(wth->fh, NULL, 12, err, err_info)) {
+ if (*err != WTAP_ERR_SHORT_READ)
+ return WTAP_OPEN_ERROR;
+ return WTAP_OPEN_NOT_MINE;
+ }
+ if (!wtap_read_bytes(wth->fh, search_encap, 4, err, err_info)) {
+ if (*err != WTAP_ERR_SHORT_READ)
+ return WTAP_OPEN_ERROR;
+ return WTAP_OPEN_NOT_MINE;
+ }
+
+ /* This is a radcom file */
+ wth->file_type_subtype = radcom_file_type_subtype;
+ wth->subtype_read = radcom_read;
+ wth->subtype_seek_read = radcom_seek_read;
+ wth->snapshot_length = 0; /* not available in header, only in frame */
+ wth->file_tsprec = WTAP_TSPREC_USEC;
+
+#if 0
+ tm.tm_year = pletoh16(&start_date.year)-1900;
+ tm.tm_mon = start_date.month-1;
+ tm.tm_mday = start_date.day;
+ sec = pletoh32(&start_date.sec);
+ tm.tm_hour = sec/3600;
+ tm.tm_min = (sec%3600)/60;
+ tm.tm_sec = sec%60;
+ tm.tm_isdst = -1;
+#endif
+
+ if (memcmp(search_encap, "LAPB", 4) == 0)
+ wth->file_encap = WTAP_ENCAP_LAPB;
+ 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 {
+ *err = WTAP_ERR_UNSUPPORTED;
+ *err_info = ws_strdup_printf("radcom: network type \"%.4s\" unknown", search_encap);
+ return WTAP_OPEN_ERROR;
+ }
+
+#if 0
+ if (!wtap_read_bytes(wth->fh, &next_date, sizeof(struct frame_date),
+ err, err_info))
+ return WTAP_OPEN_ERROR;
+
+ while (memcmp(&start_date, &next_date, 4)) {
+ if (file_seek(wth->fh, 1-sizeof(struct frame_date), SEEK_CUR, err) == -1)
+ return WTAP_OPEN_ERROR;
+ if (!wtap_read_bytes(wth->fh, &next_date, sizeof(struct frame_date),
+ err, err_info))
+ return WTAP_OPEN_ERROR;
+ }
+#endif
+
+ if (wth->file_encap == WTAP_ENCAP_ETHERNET) {
+ if (!wtap_read_bytes(wth->fh, NULL, 294, err, err_info))
+ return WTAP_OPEN_ERROR;
+ } else if (wth->file_encap == WTAP_ENCAP_LAPB) {
+ if (!wtap_read_bytes(wth->fh, NULL, 297, err, err_info))
+ return WTAP_OPEN_ERROR;
+ } else if (wth->file_encap == WTAP_ENCAP_ATM_RFC1483) {
+ if (!wtap_read_bytes(wth->fh, NULL, 504, err, err_info))
+ return WTAP_OPEN_ERROR;
+ }
+
+ /*
+ * Add an IDB; we don't know how many interfaces were involved,
+ * so we just say one interface, about which we only know
+ * the link-layer type, snapshot length, and time stamp
+ * resolution.
+ */
+ wtap_add_generated_idb(wth);
+
+ return WTAP_OPEN_MINE;
+}
+
+/* Read the next packet */
+static gboolean radcom_read(wtap *wth, wtap_rec *rec, Buffer *buf,
+ int *err, gchar **err_info, gint64 *data_offset)
+{
+ char fcs[2];
+
+ *data_offset = file_tell(wth->fh);
+
+ /* Read record. */
+ if (!radcom_read_rec(wth, wth->fh, rec, buf, err, err_info)) {
+ /* Read error or EOF */
+ return FALSE;
+ }
+
+ if (wth->file_encap == WTAP_ENCAP_LAPB) {
+ /* Read the FCS.
+ 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. */
+ if (!wtap_read_bytes(wth->fh, &fcs, sizeof fcs, err, err_info))
+ return FALSE;
+ }
+
+ return TRUE;
+}
+
+static gboolean
+radcom_seek_read(wtap *wth, gint64 seek_off,
+ wtap_rec *rec, Buffer *buf,
+ int *err, gchar **err_info)
+{
+ if (file_seek(wth->random_fh, seek_off, SEEK_SET, err) == -1)
+ return FALSE;
+
+ /* Read record. */
+ if (!radcom_read_rec(wth, wth->random_fh, rec, buf, err,
+ err_info)) {
+ /* Read error or EOF */
+ if (*err == 0) {
+ /* EOF means "short read" in random-access mode */
+ *err = WTAP_ERR_SHORT_READ;
+ }
+ return FALSE;
+ }
+ return TRUE;
+}
+
+static gboolean
+radcom_read_rec(wtap *wth, FILE_T fh, wtap_rec *rec, Buffer *buf,
+ int *err, gchar **err_info)
+{
+ struct radcomrec_hdr hdr;
+ guint16 data_length, real_length, length;
+ guint32 sec;
+ struct tm tm;
+ guint8 atmhdr[8];
+
+ if (!wtap_read_bytes_or_eof(fh, &hdr, sizeof hdr, err, err_info))
+ return FALSE;
+
+ data_length = pletoh16(&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 = pletoh16(&hdr.length);
+ real_length = pletoh16(&hdr.real_length);
+ /*
+ * The maximum value of length is 65535, which is less than
+ * WTAP_MAX_PACKET_SIZE_STANDARD will ever be, so we don't need to check
+ * it.
+ */
+
+ rec->rec_type = REC_TYPE_PACKET;
+ rec->block = wtap_block_create(WTAP_BLOCK_PACKET);
+ rec->presence_flags = WTAP_HAS_TS|WTAP_HAS_CAP_LEN;
+
+ tm.tm_year = pletoh16(&hdr.date.year)-1900;
+ tm.tm_mon = (hdr.date.month&0x0f)-1;
+ tm.tm_mday = hdr.date.day;
+ sec = pletoh32(&hdr.date.sec);
+ tm.tm_hour = sec/3600;
+ tm.tm_min = (sec%3600)/60;
+ tm.tm_sec = sec%60;
+ tm.tm_isdst = -1;
+ rec->ts.secs = mktime(&tm);
+ rec->ts.nsecs = pletoh32(&hdr.date.usec) * 1000;
+
+ switch (wth->file_encap) {
+
+ case WTAP_ENCAP_ETHERNET:
+ /* XXX - is there an FCS? */
+ rec->rec_header.packet_header.pseudo_header.eth.fcs_len = -1;
+ break;
+
+ case WTAP_ENCAP_LAPB:
+ rec->rec_header.packet_header.pseudo_header.dte_dce.flags = (hdr.dce & 0x1) ?
+ 0x00 : FROM_DCE;
+ length -= 2; /* FCS */
+ real_length -= 2;
+ break;
+
+ case WTAP_ENCAP_ATM_RFC1483:
+ /*
+ * XXX - is this stuff a pseudo-header?
+ * The direction appears to be in the "hdr.dce" field.
+ */
+ if (!wtap_read_bytes(fh, atmhdr, sizeof atmhdr, err,
+ err_info))
+ return FALSE; /* Read error */
+ length -= 8;
+ real_length -= 8;
+ break;
+ }
+
+ rec->rec_header.packet_header.len = real_length;
+ rec->rec_header.packet_header.caplen = length;
+
+ /*
+ * Read the packet data.
+ */
+ if (!wtap_read_packet_bytes(fh, buf, length, err, err_info))
+ return FALSE; /* Read error */
+
+ return TRUE;
+}
+
+static const struct supported_block_type radcom_blocks_supported[] = {
+ /*
+ * We support packet blocks, with no comments or other options.
+ */
+ { WTAP_BLOCK_PACKET, MULTIPLE_BLOCKS_SUPPORTED, NO_OPTIONS_SUPPORTED }
+};
+
+static const struct file_type_subtype_info radcom_info = {
+ "RADCOM WAN/LAN analyzer", "radcom", NULL, NULL,
+ FALSE, BLOCKS_SUPPORTED(radcom_blocks_supported),
+ NULL, NULL, NULL
+};
+
+void register_radcom(void)
+{
+ radcom_file_type_subtype = wtap_register_file_type_subtype(&radcom_info);
+
+ /*
+ * Register name for backwards compatibility with the
+ * wtap_filetypes table in Lua.
+ */
+ wtap_register_backwards_compatibility_lua_name("RADCOM",
+ radcom_file_type_subtype);
+}
+
+/*
+ * Editor modelines - https://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:
+ */
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