Adding upstream version 4.2.2.upstream/4.2.2

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 336 insertions, 0 deletions

diff --git a/wiretap/i4btrace.c b/wiretap/i4btrace.c
new file mode 100644
index 00000000..1b15972b
--- /dev/null
+++ b/wiretap/i4btrace.c
@@ -0,0 +1,336 @@
+/* i4btrace.c
+ *
+ * Wiretap Library
+ * Copyright (c) 1999 by Bert Driehuis <driehuis@playbeing.org>
+ *
+ * SPDX-License-Identifier: GPL-2.0-or-later
+ */
+
+#include "config.h"
+
+#include <stdlib.h>
+#include <string.h>
+#include "wtap-int.h"
+#include "file_wrappers.h"
+#include "i4b_trace.h"
+#include "i4btrace.h"
+
+typedef struct {
+	gboolean byte_swapped;
+} i4btrace_t;
+
+static gboolean i4btrace_read(wtap *wth, wtap_rec *rec, Buffer *buf,
+    int *err, gchar **err_info, gint64 *offset);
+static gboolean i4btrace_seek_read(wtap *wth, gint64 seek_off,
+    wtap_rec *rec, Buffer *buf, int *err, gchar **err_info);
+static int i4b_read_rec(wtap *wth, FILE_T fh, wtap_rec *rec,
+    Buffer *buf, int *err, gchar **err_info);
+
+static int i4btrace_file_type_subtype = -1;
+
+void register_i4btrace(void);
+
+/*
+ * Byte-swap the header.
+ */
+#define I4B_BYTESWAP_HEADER(hdr) \
+	{ \
+		hdr.length = GUINT32_SWAP_LE_BE(hdr.length); \
+		hdr.unit = GUINT32_SWAP_LE_BE(hdr.unit); \
+		hdr.type = GUINT32_SWAP_LE_BE(hdr.type); \
+		hdr.dir = GUINT32_SWAP_LE_BE(hdr.dir); \
+		hdr.trunc = GUINT32_SWAP_LE_BE(hdr.trunc); \
+		hdr.count = GUINT32_SWAP_LE_BE(hdr.count); \
+		hdr.ts_sec = GUINT32_SWAP_LE_BE(hdr.ts_sec); \
+		hdr.ts_usec = GUINT32_SWAP_LE_BE(hdr.ts_usec); \
+	}
+
+/*
+ * Test some fields in the header to see if they make sense.
+ */
+#define	I4B_HDR_IS_OK(hdr) \
+	(!(hdr.length < sizeof(hdr) || \
+	    hdr.length > 16384 || \
+	    hdr.unit > 4 || \
+	    hdr.type > TRC_CH_B2 || \
+	    hdr.dir > FROM_NT || \
+	    hdr.trunc > 2048 || \
+	    hdr.ts_usec >= 1000000))
+
+/*
+ * Number of packets to try reading.
+ */
+#define PACKETS_TO_CHECK	5
+
+wtap_open_return_val i4btrace_open(wtap *wth, int *err, gchar **err_info)
+{
+	i4b_trace_hdr_t hdr;
+	gboolean byte_swapped = FALSE;
+	i4btrace_t *i4btrace;
+
+	/* I4B trace files have no magic in the header... Sigh */
+	if (!wtap_read_bytes(wth->fh, &hdr, sizeof(hdr), err, err_info)) {
+		if (*err != WTAP_ERR_SHORT_READ)
+			return WTAP_OPEN_ERROR;
+		return WTAP_OPEN_NOT_MINE;
+	}
+
+	/* Silly heuristic... */
+	if (!I4B_HDR_IS_OK(hdr)) {
+		/*
+		 * OK, try byte-swapping the header fields.
+		 */
+		I4B_BYTESWAP_HEADER(hdr);
+		if (!I4B_HDR_IS_OK(hdr)) {
+			/*
+			 * It doesn't look valid in either byte order.
+			 */
+			return WTAP_OPEN_NOT_MINE;
+		}
+
+		/*
+		 * It looks valid byte-swapped, so assume it's a
+		 * trace written in the opposite byte order.
+		 */
+		byte_swapped = TRUE;
+	}
+
+	/*
+	 * Now try to read past the packet bytes; if that fails with
+	 * a short read, we don't fail, so that we can report
+	 * the file as a truncated I4B file.
+	 */
+	if (!wtap_read_bytes(wth->fh, NULL, hdr.length - (guint32)sizeof(hdr),
+	    err, err_info)) {
+		if (*err != WTAP_ERR_SHORT_READ)
+			return WTAP_OPEN_ERROR;
+	} else {
+		/*
+		 * Now try reading a few more packets.
+		 */
+		for (int i = 1; i < PACKETS_TO_CHECK; i++) {
+			/*
+			 * Read and check the file header; we've already
+			 * decided whether this would be a byte-swapped file
+			 * or not, so we swap iff we decided it was.
+			 */
+			if (!wtap_read_bytes_or_eof(wth->fh, &hdr, sizeof(hdr), err,
+			    err_info)) {
+				if (*err == 0) {
+					/* EOF; no more packets to try. */
+					break;
+				}
+				if (*err != WTAP_ERR_SHORT_READ)
+					return WTAP_OPEN_ERROR;
+				return WTAP_OPEN_NOT_MINE;
+			}
+
+			if (byte_swapped)
+				I4B_BYTESWAP_HEADER(hdr);
+			if (!I4B_HDR_IS_OK(hdr)) {
+				/*
+				 * It doesn't look valid.
+				 */
+				return WTAP_OPEN_NOT_MINE;
+			}
+
+			/*
+			 * Now try to read past the packet bytes; if that
+			 * fails with a short read, we don't fail, so that
+			 * we can report the file as a truncated I4B file.
+			 */
+			if (!wtap_read_bytes(wth->fh, NULL,
+			    hdr.length - (guint32)sizeof(hdr), err, err_info)) {
+				if (*err != WTAP_ERR_SHORT_READ)
+					return WTAP_OPEN_ERROR;
+
+				/*
+				 * Probably a truncated file, so just quit.
+				 */
+				break;
+			}
+		}
+	}
+
+	if (file_seek(wth->fh, 0, SEEK_SET, err) == -1)
+		return WTAP_OPEN_ERROR;
+
+	/* Get capture start time */
+
+	wth->file_type_subtype = i4btrace_file_type_subtype;
+	i4btrace = g_new(i4btrace_t, 1);
+	wth->priv = (void *)i4btrace;
+	wth->subtype_read = i4btrace_read;
+	wth->subtype_seek_read = i4btrace_seek_read;
+	wth->snapshot_length = 0;	/* not known */
+
+	i4btrace->byte_swapped = byte_swapped;
+
+	wth->file_encap = WTAP_ENCAP_ISDN;
+	wth->file_tsprec = WTAP_TSPREC_USEC;
+
+	/*
+	 * 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 i4btrace_read(wtap *wth, wtap_rec *rec, Buffer *buf,
+    int *err, gchar **err_info, gint64 *data_offset)
+{
+	*data_offset = file_tell(wth->fh);
+
+	return i4b_read_rec(wth, wth->fh, rec, buf, err, err_info);
+}
+
+static gboolean
+i4btrace_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;
+
+	if (!i4b_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
+i4b_read_rec(wtap *wth, FILE_T fh, wtap_rec *rec, Buffer *buf,
+    int *err, gchar **err_info)
+{
+	i4btrace_t *i4btrace = (i4btrace_t *)wth->priv;
+	i4b_trace_hdr_t hdr;
+	guint32 length;
+
+	if (!wtap_read_bytes_or_eof(fh, &hdr, sizeof hdr, err, err_info))
+		return FALSE;
+
+	if (i4btrace->byte_swapped) {
+		/*
+		 * Byte-swap the header.
+		 */
+		I4B_BYTESWAP_HEADER(hdr);
+	}
+
+	if (hdr.length < sizeof(hdr)) {
+		*err = WTAP_ERR_BAD_FILE;	/* record length < header! */
+		*err_info = ws_strdup_printf("i4btrace: record length %u < header length %lu",
+		    hdr.length, (unsigned long)sizeof(hdr));
+		return FALSE;
+	}
+	length = hdr.length - (guint32)sizeof(hdr);
+	if (length > WTAP_MAX_PACKET_SIZE_STANDARD) {
+		/*
+		 * 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 = ws_strdup_printf("i4btrace: File has %u-byte packet, bigger than maximum of %u",
+		    length, WTAP_MAX_PACKET_SIZE_STANDARD);
+		return FALSE;
+	}
+
+	rec->rec_type = REC_TYPE_PACKET;
+	rec->block = wtap_block_create(WTAP_BLOCK_PACKET);
+	rec->presence_flags = WTAP_HAS_TS;
+
+	rec->rec_header.packet_header.len = length;
+	rec->rec_header.packet_header.caplen = length;
+
+	rec->ts.secs = hdr.ts_sec;
+	rec->ts.nsecs = hdr.ts_usec * 1000;
+
+	switch (hdr.type) {
+
+	case TRC_CH_I:
+		/*
+		 * XXX - what is it?  It's probably not WTAP_ENCAP_NULL,
+		 * as that means it has a 4-byte AF_ type as the
+		 * encapsulation header.
+		 */
+		rec->rec_header.packet_header.pkt_encap = WTAP_ENCAP_NULL;
+		break;
+
+	case TRC_CH_D:
+		/*
+		 * D channel, so it's LAPD; set "p2p.sent".
+		 */
+		rec->rec_header.packet_header.pkt_encap = WTAP_ENCAP_ISDN;
+		rec->rec_header.packet_header.pseudo_header.isdn.channel = 0;
+		break;
+
+	case TRC_CH_B1:
+		/*
+		 * B channel 1.
+		 */
+		rec->rec_header.packet_header.pkt_encap = WTAP_ENCAP_ISDN;
+		rec->rec_header.packet_header.pseudo_header.isdn.channel = 1;
+		break;
+
+	case TRC_CH_B2:
+		/*
+		 * B channel 2.
+		 */
+		rec->rec_header.packet_header.pkt_encap = WTAP_ENCAP_ISDN;
+		rec->rec_header.packet_header.pseudo_header.isdn.channel = 2;
+		break;
+	}
+
+	rec->rec_header.packet_header.pseudo_header.isdn.uton = (hdr.dir == FROM_TE);
+
+	/*
+	 * Read the packet data.
+	 */
+	return wtap_read_packet_bytes(fh, buf, length, err, err_info);
+}
+
+static const struct supported_block_type i4btrace_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 i4btrace_info = {
+	"I4B ISDN trace", "i4btrace", NULL, NULL,
+	FALSE, BLOCKS_SUPPORTED(i4btrace_blocks_supported),
+	NULL, NULL, NULL
+};
+
+void register_i4btrace(void)
+{
+	i4btrace_file_type_subtype = wtap_register_file_type_subtype(&i4btrace_info);
+
+	/*
+	 * Register name for backwards compatibility with the
+	 * wtap_filetypes table in Lua.
+	 */
+	wtap_register_backwards_compatibility_lua_name("I4BTRACE",
+	    i4btrace_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:
+ */