ade3a6b658
You either have to set it to 1 or 0 if you know whether it's shifted time or set it to -1 if you don't. Should address Coverity CID 1452227. Change-Id: I7d435bb6b7dd8897b44bf5103578e3db1a30379e Reviewed-on: https://code.wireshark.org/review/34175 Reviewed-by: Guy Harris <guy@alum.mit.edu>
449 lines
13 KiB
C
449 lines
13 KiB
C
/* busmaster.c
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*
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* Wiretap Library
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* Copyright (c) 1998 by Gilbert Ramirez <gram@alumni.rice.edu>
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*
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* Support for Busmaster log file format
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* Copyright (c) 2019 by Maksim Salau <maksim.salau@gmail.com>
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*
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* SPDX-License-Identifier: GPL-2.0-or-later
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*/
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#include "config.h"
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#include <wtap-int.h>
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#include <file_wrappers.h>
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#include <epan/exported_pdu.h>
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#include <epan/dissectors/packet-socketcan.h>
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#include "busmaster.h"
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#include "busmaster_priv.h"
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#include <inttypes.h>
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#include <string.h>
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#include <errno.h>
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static void
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busmaster_close(wtap *wth);
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static gboolean
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busmaster_read(wtap *wth, wtap_rec *rec, Buffer *buf,
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int *err, gchar **err_info,
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gint64 *data_offset);
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static gboolean
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busmaster_seek_read(wtap *wth, gint64 seek_off,
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wtap_rec *rec, Buffer *buf,
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int *err, gchar **err_info);
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static gboolean
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busmaster_gen_packet(wtap_rec *rec, Buffer *buf,
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const busmaster_priv_t *priv_entry, const msg_t *msg,
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int *err, gchar **err_info)
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{
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time_t secs = 0;
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guint32 nsecs = 0;
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gboolean has_ts = FALSE;
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gboolean is_fd = (msg->type == MSG_TYPE_STD_FD)
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|| (msg->type == MSG_TYPE_EXT_FD);
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gboolean is_eff = (msg->type == MSG_TYPE_EXT)
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|| (msg->type == MSG_TYPE_EXT_RTR)
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|| (msg->type == MSG_TYPE_EXT_FD);
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gboolean is_rtr = (msg->type == MSG_TYPE_STD_RTR)
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|| (msg->type == MSG_TYPE_EXT_RTR);
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gboolean is_err = (msg->type == MSG_TYPE_ERR);
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static const char *const can_proto_name = "can-hostendian";
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static const char *const canfd_proto_name = "canfd";
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const char *proto_name = is_fd ? canfd_proto_name : can_proto_name;
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guint proto_name_length = (guint)strlen(proto_name) + 1;
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guint header_length;
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guint packet_length;
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guint frame_length;
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guint8 *buf_data;
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/* Adjust proto name length to be aligned on 4 byte boundary */
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proto_name_length += (proto_name_length % 4) ? (4 - (proto_name_length % 4)) : 0;
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header_length = 4 + proto_name_length + 4;
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frame_length = is_fd ? sizeof(canfd_frame_t) : sizeof(can_frame_t);
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packet_length = header_length + frame_length;
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ws_buffer_clean(buf);
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ws_buffer_assure_space(buf, packet_length);
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buf_data = ws_buffer_start_ptr(buf);
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memset(buf_data, 0, packet_length);
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buf_data[1] = EXP_PDU_TAG_PROTO_NAME;
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buf_data[3] = proto_name_length;
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memcpy(buf_data + 4, proto_name, strlen(proto_name));
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if (!priv_entry)
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{
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*err = WTAP_ERR_BAD_FILE;
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*err_info = g_strdup("Header is missing");
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return FALSE;
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}
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if (is_fd)
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{
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canfd_frame_t canfd_frame;
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memset(&canfd_frame, 0, sizeof(canfd_frame));
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canfd_frame.can_id = (msg->id & (is_eff ? CAN_EFF_MASK : CAN_SFF_MASK)) |
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(is_eff ? CAN_EFF_FLAG : 0) |
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(is_err ? CAN_ERR_FLAG : 0);
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canfd_frame.flags = 0;
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canfd_frame.len = msg->data.length;
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memcpy(canfd_frame.data,
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msg->data.data,
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MIN(msg->data.length, sizeof(canfd_frame.data)));
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memcpy(buf_data + header_length,
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(guint8 *)&canfd_frame,
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sizeof(canfd_frame));
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}
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else
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{
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can_frame_t can_frame;
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memset(&can_frame, 0, sizeof(can_frame));
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can_frame.can_id = (msg->id & (is_eff ? CAN_EFF_MASK : CAN_SFF_MASK)) |
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(is_rtr ? CAN_RTR_FLAG : 0) |
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(is_eff ? CAN_EFF_FLAG : 0) |
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(is_err ? CAN_ERR_FLAG : 0);
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can_frame.can_dlc = msg->data.length;
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memcpy(can_frame.data,
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msg->data.data,
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MIN(msg->data.length, sizeof(can_frame.data)));
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memcpy(buf_data + header_length,
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(guint8 *)&can_frame,
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sizeof(can_frame));
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}
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if (priv_entry->time_mode == TIME_MODE_SYSTEM)
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{
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struct tm tm;
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tm.tm_year = priv_entry->start_date.year - 1900;
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tm.tm_mon = priv_entry->start_date.month - 1;
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tm.tm_mday = priv_entry->start_date.day;
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tm.tm_hour = msg->timestamp.hours;
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tm.tm_min = msg->timestamp.minutes;
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tm.tm_sec = msg->timestamp.seconds;
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tm.tm_isdst = -1;
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secs = mktime(&tm);
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nsecs = msg->timestamp.micros * 1000u;
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has_ts = TRUE;
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}
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else if (priv_entry->time_mode == TIME_MODE_ABSOLUTE)
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{
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struct tm tm;
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guint32 micros;
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tm.tm_year = priv_entry->start_date.year - 1900;
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tm.tm_mon = priv_entry->start_date.month - 1;
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tm.tm_mday = priv_entry->start_date.day;
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tm.tm_hour = priv_entry->start_time.hours;
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tm.tm_min = priv_entry->start_time.minutes;
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tm.tm_sec = priv_entry->start_time.seconds;
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tm.tm_isdst = -1;
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secs = mktime(&tm);
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secs += msg->timestamp.hours * 3600;
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secs += msg->timestamp.minutes * 60;
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secs += msg->timestamp.seconds;
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micros = priv_entry->start_time.micros + msg->timestamp.micros;
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if (micros >= 1000000u)
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{
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micros -= 1000000u;
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secs += 1;
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}
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nsecs = micros * 1000u;
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has_ts = TRUE;
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}
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rec->rec_type = REC_TYPE_PACKET;
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rec->presence_flags = has_ts ? WTAP_HAS_TS : 0;
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rec->ts.secs = secs;
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rec->ts.nsecs = nsecs;
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rec->rec_header.packet_header.caplen = packet_length;
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rec->rec_header.packet_header.len = packet_length;
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return TRUE;
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}
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static log_entry_type_t
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busmaster_parse(FILE_T fh, busmaster_state_t *state, int *err, char **err_info)
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{
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gboolean ok;
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gint64 seek_off;
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busmaster_debug_printf("%s: Running busmaster file decoder\n", G_STRFUNC);
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state->fh = fh;
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do
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{
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if (file_eof(fh))
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return LOG_ENTRY_EOF;
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seek_off = file_tell(fh);
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busmaster_debug_printf("%s: Starting parser at offset %" PRIi64 "\n",
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G_STRFUNC, seek_off);
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state->file_bytes_read = 0;
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ok = run_busmaster_parser(state, err, err_info);
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/* Rewind the file to the offset we have finished parsing */
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busmaster_debug_printf("%s: Rewinding to offset %" PRIi64 "\n",
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G_STRFUNC, seek_off + state->file_bytes_read);
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if (file_seek(fh, seek_off + state->file_bytes_read, SEEK_SET, err) == -1)
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{
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g_free(*err_info);
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*err = errno;
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*err_info = g_strdup(g_strerror(errno));
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return LOG_ENTRY_ERROR;
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}
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}
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while (ok && state->entry_type == LOG_ENTRY_NONE);
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if (!ok)
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return LOG_ENTRY_ERROR;
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busmaster_debug_printf("%s: Success\n", G_STRFUNC);
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return state->entry_type;
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}
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wtap_open_return_val
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busmaster_open(wtap *wth, int *err, char **err_info)
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{
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busmaster_state_t state;
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log_entry_type_t entry;
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busmaster_debug_printf("%s: Trying to open with busmaster log reader\n",
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G_STRFUNC);
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/* Rewind to the beginning */
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if (file_seek(wth->fh, 0, SEEK_SET, err) == -1)
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return WTAP_OPEN_ERROR;
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memset(&state, 0, sizeof(state));
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entry = busmaster_parse(wth->fh, &state, err, err_info);
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g_free(*err_info);
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*err_info = NULL;
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*err = 0;
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if (entry != LOG_ENTRY_HEADER)
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return WTAP_OPEN_NOT_MINE;
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/* Rewind to the beginning, so busmaster_read may read from the very beginning */
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if (file_seek(wth->fh, 0, SEEK_SET, err) == -1)
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return WTAP_OPEN_ERROR;
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busmaster_debug_printf("%s: That's a busmaster log\n", G_STRFUNC);
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wth->priv = NULL;
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wth->subtype_close = busmaster_close;
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wth->subtype_read = busmaster_read;
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wth->subtype_seek_read = busmaster_seek_read;
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wth->file_type_subtype = WTAP_FILE_TYPE_SUBTYPE_UNKNOWN;
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wth->file_encap = WTAP_ENCAP_WIRESHARK_UPPER_PDU;
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wth->file_tsprec = WTAP_TSPREC_USEC;
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return WTAP_OPEN_MINE;
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}
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static void
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busmaster_close(wtap *wth)
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{
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busmaster_debug_printf("%s\n", G_STRFUNC);
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g_slist_free_full((GSList *)wth->priv, g_free);
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wth->priv = NULL;
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}
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static busmaster_priv_t *
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busmaster_find_priv_entry(void *priv, gint64 offset)
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{
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GSList *list;
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for (list = (GSList *)priv; list; list = g_slist_next(list))
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{
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busmaster_priv_t *entry = (busmaster_priv_t *)list->data;
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if (((entry->file_end_offset == -1)
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&& (g_slist_next(list) == NULL))
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|| ((offset >= entry->file_start_offset)
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&& (offset <= entry->file_end_offset)))
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{
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return entry;
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}
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}
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return NULL;
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}
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static gboolean
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busmaster_read(wtap *wth, wtap_rec *rec, Buffer *buf, int *err, gchar **err_info,
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gint64 *data_offset)
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{
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log_entry_type_t entry;
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busmaster_state_t state;
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busmaster_priv_t *priv_entry;
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gboolean is_msg = FALSE;
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gboolean is_ok = TRUE;
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while (!is_msg && is_ok)
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{
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busmaster_debug_printf("%s: offset = %" PRIi64 "\n",
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G_STRFUNC, file_tell(wth->fh));
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if (file_eof(wth->fh))
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{
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busmaster_debug_printf("%s: End of file detected, nothing to do here\n",
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G_STRFUNC);
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*err = 0;
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*err_info = NULL;
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return FALSE;
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}
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*data_offset = file_tell(wth->fh);
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priv_entry = busmaster_find_priv_entry(wth->priv, *data_offset);
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memset(&state, 0, sizeof(state));
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if (priv_entry)
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state.header = *priv_entry;
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entry = busmaster_parse(wth->fh, &state, err, err_info);
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busmaster_debug_printf("%s: analyzing output\n", G_STRFUNC);
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switch (entry)
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{
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case LOG_ENTRY_EMPTY:
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break;
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case LOG_ENTRY_FOOTER_AND_HEADER:
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case LOG_ENTRY_FOOTER:
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priv_entry = (busmaster_priv_t *)g_slist_last((GSList *)wth->priv)->data;
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if (!priv_entry)
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{
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*err = WTAP_ERR_BAD_FILE;
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*err_info = g_strdup("Header is missing");
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return FALSE;
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}
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priv_entry->file_end_offset = *data_offset;
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if (entry == LOG_ENTRY_FOOTER)
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break;
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/* fall-through */
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case LOG_ENTRY_HEADER:
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if (state.header.protocol != PROTOCOL_CAN &&
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state.header.protocol != PROTOCOL_J1939)
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{
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*err = WTAP_ERR_UNSUPPORTED;
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*err_info = g_strdup("Unsupported protocol type");
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return FALSE;
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}
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if (wth->priv)
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{
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/* Check that the previous section has a footer */
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priv_entry = (busmaster_priv_t *)g_slist_last((GSList *)wth->priv)->data;
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if (priv_entry && priv_entry->file_end_offset == -1)
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{
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*err = WTAP_ERR_BAD_FILE;
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*err_info = g_strdup("Footer is missing");
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return FALSE;
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}
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}
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/* Start a new section */
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priv_entry = g_new(busmaster_priv_t, 1);
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priv_entry[0] = state.header;
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priv_entry->file_start_offset = file_tell(wth->fh);
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priv_entry->file_end_offset = -1;
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wth->priv = g_slist_append((GSList *)wth->priv, priv_entry);
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break;
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case LOG_ENTRY_MSG:
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is_msg = TRUE;
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priv_entry = busmaster_find_priv_entry(wth->priv, *data_offset);
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is_ok = busmaster_gen_packet(rec, buf, priv_entry, &state.msg, err, err_info);
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break;
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case LOG_ENTRY_EOF:
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case LOG_ENTRY_ERROR:
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case LOG_ENTRY_NONE:
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default:
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is_ok = FALSE;
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break;
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}
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}
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busmaster_debug_printf("%s: stopped at offset %" PRIi64 " with entry %d\n",
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G_STRFUNC, file_tell(wth->fh), entry);
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return is_ok;
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}
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static gboolean
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busmaster_seek_read(wtap *wth, gint64 seek_off, wtap_rec *rec,
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Buffer *buf, int *err, gchar **err_info)
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{
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busmaster_priv_t *priv_entry;
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busmaster_state_t state;
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log_entry_type_t entry;
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busmaster_debug_printf("%s: offset = %" PRIi64 "\n", G_STRFUNC, seek_off);
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priv_entry = busmaster_find_priv_entry(wth->priv, seek_off);
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if (!priv_entry)
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{
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busmaster_debug_printf("%s: analyzing output\n", G_STRFUNC);
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*err = WTAP_ERR_BAD_FILE;
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*err_info = g_strdup("Malformed header");
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return FALSE;
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}
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if (file_seek(wth->random_fh, seek_off, SEEK_SET, err) == -1)
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return FALSE;
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memset(&state, 0, sizeof(state));
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state.header = *priv_entry;
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entry = busmaster_parse(wth->random_fh, &state, err, err_info);
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busmaster_debug_printf("%s: analyzing output\n", G_STRFUNC);
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if (entry == LOG_ENTRY_ERROR || entry == LOG_ENTRY_NONE)
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return FALSE;
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if (entry != LOG_ENTRY_MSG)
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{
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*err = WTAP_ERR_BAD_FILE;
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*err_info = g_strdup("Failed to read a frame");
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return FALSE;
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}
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return busmaster_gen_packet(rec, buf, priv_entry, &state.msg, err, err_info);
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}
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/*
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* Editor modelines - https://www.wireshark.org/tools/modelines.html
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*
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* Local variables:
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* c-basic-offset: 4
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* tab-width: 8
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* indent-tabs-mode: nil
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* End:
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*
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* vi: set shiftwidth=4 tabstop=8 expandtab:
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* :indentSize=4:tabSize=8:noTabs=true:
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*/
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