Adding upstream version 4.2.2.upstream/4.2.2

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

1 files changed, 289 insertions, 0 deletions

diff --git a/wiretap/dpa400.c b/wiretap/dpa400.c
new file mode 100644
index 00000000..671dbdff
--- /dev/null
+++ b/wiretap/dpa400.c
@@ -0,0 +1,289 @@
+/* dpa400.c
+ *
+ * Unigraf DisplayPort AUX channel monitor output parser
+ * Copyright 2018, Dirk Eibach, Guntermann & Drunck GmbH <dirk.eibach@gdsys.cc>
+ *
+ * SPDX-License-Identifier: GPL-2.0-or-later
+ */
+
+#include "config.h"
+
+#include <string.h>
+
+#include "wtap-int.h"
+#include "file_wrappers.h"
+#include "dpa400.h"
+
+enum {
+	DPA400_DATA = 0x00,
+	DPA400_DATA_END = 0x01,
+	DPA400_EVENT = 0x02,
+	DPA400_START = 0x03,
+	DPA400_STOP = 0x04,
+	DPA400_TS_OVERFLOW = 0x84,
+};
+
+struct dpa400_header {
+	guint8 t0;
+	guint8 sb0;
+	guint8 t1;
+	guint8 sb1;
+	guint8 t2;
+	guint8 sb2;
+};
+
+static int dpa400_file_type_subtype = -1;
+
+void register_dpa400(void);
+
+static gboolean dpa400_read_header(FILE_T fh, struct dpa400_header *hdr, int *err, gchar **err_info)
+{
+	if (!wtap_read_bytes_or_eof(fh, hdr, sizeof(struct dpa400_header), err, err_info))
+		return FALSE;
+
+	if (hdr->sb0 || hdr->sb1 || hdr->sb2) {
+		*err = WTAP_ERR_BAD_FILE;
+		*err_info = g_strdup("dpa400: malformed packet header");
+		return FALSE;
+	}
+
+	return TRUE;
+}
+
+static void get_ts(struct dpa400_header *hdr, nstime_t *ts)
+{
+	guint32 val;
+
+	val = (hdr->t0 | (hdr->t1 << 8) | ((hdr->t2 & 0x7f) << 16)) << 5;
+
+	ts->secs = val / 1000000;
+	ts->nsecs = (val % 1000000) * 1000;
+}
+
+static void get_ts_overflow(nstime_t *ts)
+{
+	guint32 val = 0x7fffff << 5;
+
+	ts->secs = val / 1000000;
+	ts->nsecs = (val % 1000000) * 1000;
+}
+
+static guint8 get_from(struct dpa400_header *hdr)
+{
+	return hdr->t2 & 0x80;
+}
+
+static gboolean dpa400_read_packet(wtap *wth, FILE_T fh, wtap_rec *rec,
+    Buffer *buf, int *err, gchar **err_info)
+{
+	guint8 chunk[2];
+	guint32 ctr = 0;
+
+	if (!wth || !rec || !buf)
+		return FALSE;
+
+	if (!wtap_read_bytes_or_eof(fh, chunk, sizeof(chunk), err, err_info))
+		return FALSE;
+
+	if (chunk[1] != 1) {
+		*err = WTAP_ERR_BAD_FILE;
+		*err_info = g_strdup("dpa400: malformed packet framing");
+		return FALSE;
+	}
+
+	ws_buffer_clean(buf);
+
+	ws_buffer_append(buf, &chunk[0], 1);
+	ctr++;
+
+	switch (chunk[0]) {
+	case DPA400_STOP: {
+		struct dpa400_header hdr;
+
+		if (!dpa400_read_header(fh, &hdr, err, err_info))
+			return FALSE;
+
+		get_ts(&hdr, &rec->ts);
+
+		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.caplen = rec->rec_header.packet_header.len = 0;
+
+		break;
+	}
+
+	case DPA400_START:
+	case DPA400_EVENT: {
+		struct dpa400_header hdr;
+
+		if (!dpa400_read_header(fh, &hdr, err, err_info))
+			return FALSE;
+
+		get_ts(&hdr, &rec->ts);
+
+		if (!wtap_read_bytes_or_eof(fh, chunk, sizeof(chunk), err, err_info))
+			return FALSE;
+
+		if (chunk[1]) {
+			*err = WTAP_ERR_BAD_FILE;
+			*err_info = g_strdup("dpa400: malformed packet");
+			return FALSE;
+		}
+
+		ws_buffer_append(buf, &chunk[0], 1);
+		ctr++;
+
+		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.caplen = rec->rec_header.packet_header.len = ctr;
+
+		break;
+	}
+
+	case DPA400_DATA: {
+		struct dpa400_header hdr;
+		guint8 from_source;
+
+		if (!dpa400_read_header(fh, &hdr, err, err_info))
+			return FALSE;
+
+		get_ts(&hdr, &rec->ts);
+
+		from_source = !get_from(&hdr);
+		ws_buffer_append(buf, &from_source, 1);
+		ctr++;
+
+		while (1) {
+			if (!wtap_read_bytes_or_eof(fh, chunk, sizeof(chunk), err, err_info))
+				return FALSE;
+
+			if (chunk[1])
+				break;
+
+			if (++ctr > WTAP_MAX_PACKET_SIZE_STANDARD) {
+				*err = WTAP_ERR_BAD_FILE;
+				*err_info = ws_strdup_printf("dpa400: File has data record bigger than maximum of %u",
+					WTAP_MAX_PACKET_SIZE_STANDARD);
+				return FALSE;
+			}
+
+			ws_buffer_append(buf, &chunk[0], 1);
+		}
+
+		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.caplen = rec->rec_header.packet_header.len = ctr;
+
+		break;
+	}
+
+	case DPA400_TS_OVERFLOW: {
+		get_ts_overflow(&rec->ts);
+
+		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.caplen = rec->rec_header.packet_header.len = ctr;
+
+		break;
+	}
+
+	default:
+		*err = WTAP_ERR_BAD_FILE;
+		*err_info = ws_strdup_printf("dpa400: unknown packet type %02x", chunk[0]);
+		return FALSE;
+	}
+
+	return TRUE;
+}
+
+static gboolean dpa400_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;
+
+	return dpa400_read_packet(wth, wth->random_fh, rec, buf, err, err_info);
+}
+
+static gboolean dpa400_read(wtap *wth, wtap_rec *rec, Buffer *buf,
+    int *err, gchar **err_info, gint64 *data_offset)
+{
+	*data_offset = file_tell(wth->fh);
+
+	return dpa400_read_packet(wth, wth->fh, rec, buf, err, err_info);
+}
+
+wtap_open_return_val dpa400_open(wtap *wth, int *err, gchar **err_info)
+{
+	char magic[4];
+	const char dpa_magic[] = { 'D', 'B', 'F', 'R' };
+
+	/* Read in the number that should be at the start of a "dpa-400" 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, dpa_magic, sizeof(dpa_magic)))
+		return WTAP_OPEN_NOT_MINE;
+
+	wth->file_type_subtype = dpa400_file_type_subtype;
+	wth->file_encap = WTAP_ENCAP_DPAUXMON;
+	wth->file_tsprec = WTAP_TSPREC_USEC;
+	wth->subtype_read = dpa400_read;
+	wth->subtype_seek_read = dpa400_seek_read;
+	wth->snapshot_length = 0;
+
+	/*
+	 * 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;
+}
+
+static const struct supported_block_type dpa400_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 dpa400_info = {
+	"Unigraf DPA-400 capture", "dpa400", "bin", NULL,
+	FALSE, BLOCKS_SUPPORTED(dpa400_blocks_supported),
+	NULL, NULL, NULL
+};
+
+void register_dpa400(void)
+{
+	dpa400_file_type_subtype = wtap_register_file_type_subtype(&dpa400_info);
+
+	/*
+	 * Register name for backwards compatibility with the
+	 * wtap_filetypes table in Lua.
+	 */
+	wtap_register_backwards_compatibility_lua_name("DPA400",
+	    dpa400_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:
+ */