wiretap: Add support of candump logs

The change adds ability to import text logs produced by the candump
tool.

E.g.: candump -L can0 -or- candump -l can0

The whole file is read and converted into a temporary PCAPNG file with
Exported PDU packets containing SocketCAN frames.

Bug: 15889
Change-Id: I5ad93dca96d6e955a4b21cf624f0553e60f060f6
Reviewed-on: https://code.wireshark.org/review/33800
Petri-Dish: Jim Young <jim.young.ws@gmail.com>
Tested-by: Petri Dish Buildbot
Reviewed-by: Anders Broman <a.broman58@gmail.com>

1 files changed, 87 insertions, 0 deletions

diff --git a/wiretap/candump_priv.h b/wiretap/candump_priv.h
new file mode 100644
index 0000000000..9749daec3e
--- /dev/null
+++ b/wiretap/candump_priv.h
@@ -0,0 +1,87 @@
+/* candump-priv.h
+ *
+ * Wiretap Library
+ * Copyright (c) 1998 by Gilbert Ramirez <gram@alumni.rice.edu>
+ *
+ * Support for candump log file format
+ * Copyright (c) 2019 by Maksim Salau <maksim.salau@gmail.com>
+ *
+ * SPDX-License-Identifier: GPL-2.0-or-later
+ */
+
+#ifndef CANDUMP_PRIV_H__
+#define CANDUMP_PRIV_H__
+
+#include <gmodule.h>
+#include <wiretap/wtap.h>
+#include <epan/dissectors/packet-socketcan.h>
+
+#define CAN_MAX_DLEN   8
+#define CANFD_MAX_DLEN 64
+
+typedef struct can_frame {
+    guint32 can_id;                       /* 32 bit CAN_ID + EFF/RTR/ERR flags */
+    guint8  can_dlc;                      /* frame payload length in byte (0 .. CAN_MAX_DLEN) */
+    guint8  __pad;                        /* padding */
+    guint8  __res0;                       /* reserved / padding */
+    guint8  __res1;                       /* reserved / padding */
+    guint8  data[CAN_MAX_DLEN];
+} can_frame_t;
+
+typedef struct canfd_frame {
+    guint32 can_id;                       /* 32 bit CAN_ID + EFF/RTR/ERR flags */
+    guint8  len;                          /* frame payload length in byte (0 .. CANFD_MAX_DLEN) */
+    guint8  flags;                        /* additional flags for CAN FD */
+    guint8  __res0;                       /* reserved / padding */
+    guint8  __res1;                       /* reserved / padding */
+    guint8  data[CANFD_MAX_DLEN];
+} canfd_frame_t;
+
+typedef struct {
+    guint8     length;
+    guint8     data[CANFD_MAX_DLEN];
+} msg_data_t;
+
+typedef struct {
+    nstime_t   ts;
+    guint32    id;
+    gboolean   is_fd;
+    guint8     flags;
+    msg_data_t data;
+} msg_t;
+
+typedef struct {
+    gint64 v0;
+    gint64 v1;
+} token_t;
+
+typedef struct {
+    wtap *tmp_file;
+    char *tmp_filename;
+} candump_priv_t;
+
+typedef struct {
+    GSList *packets;
+
+    FILE_T  fh;
+    int     err;
+    gchar  *err_info;
+    gchar  *parse_error;
+
+    token_t token;
+} candump_state_t;
+
+GSList *
+run_candump_parser(FILE_T fh, int *err, gchar **err_info);
+
+#include <wsutil/ws_printf.h>
+
+/* Uncomment the following line to make decoder verbose */
+//#undef NDEBUG
+
+#ifdef NDEBUG
+#undef  ws_debug_printf
+#define ws_debug_printf(...) (void)0
+#endif
+
+#endif  /* CANDUMP_PRIV_H__ */