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use crate::{
dlt::{
calculate_all_headers_length, float_width_to_type_length, ApplicationTraceType, Argument,
ControlType, DltTimeStamp, Endianness, ExtendedHeader, FixedPoint, FixedPointValue,
FloatWidth, LogLevel, Message, MessageType, NetworkTraceType, PayloadContent,
StandardHeader, StorageHeader, TypeInfo, TypeInfoKind, TypeLength, Value, BIG_ENDIAN_FLAG,
STORAGE_HEADER_LENGTH, VERBOSE_FLAG, WITH_ECU_ID_FLAG, WITH_EXTENDED_HEADER_FLAG,
WITH_SESSION_ID_FLAG, WITH_TIMESTAMP_FLAG,
},
filtering,
};
use byteorder::{BigEndian, LittleEndian};
use nom::{
bytes::streaming::{tag, take, take_while_m_n},
combinator::map,
error::{ErrorKind, ParseError},
multi::count,
number::streaming::{
be_f32, be_f64, be_i128, be_i16, be_i32, be_i64, be_i8, be_u128, be_u16, be_u32, be_u64,
be_u8, le_f32, le_f64, le_i128, le_i16, le_i32, le_i64, le_u128, le_u16, le_u32, le_u64,
},
sequence::tuple,
Err::Error,
IResult,
};
use std::convert::TryFrom;
use thiserror::Error;
const DLT_PATTERN_SIZE: usize = 4;
pub const DLT_PATTERN: &[u8] = &[0x44, 0x4C, 0x54, 0x01];
pub(crate) fn parse_ecu_id(input: &[u8]) -> IResult<&[u8], &str, DltParseError> {
dlt_zero_terminated_string(input, 4)
}
impl ParseError<&[u8]> for DltParseError {
fn from_error_kind(input: &[u8], kind: ErrorKind) -> Self {
DltParseError::ParsingHickup(format!(
"Nom error: {:?} ({} bytes left)",
kind,
input.len()
))
}
fn append(_: &[u8], _: ErrorKind, other: Self) -> Self {
other
}
}
#[derive(Error, Debug, PartialEq)]
pub enum DltParseError {
#[error("parsing stopped, cannot continue: {0}")]
Unrecoverable(String),
#[error("parsing error, try to continue: {0}")]
ParsingHickup(String),
#[error("parsing could not complete: {:?}", needed)]
IncompleteParse {
needed: Option<std::num::NonZeroUsize>,
},
}
impl From<std::io::Error> for DltParseError {
fn from(err: std::io::Error) -> DltParseError {
DltParseError::Unrecoverable(format!("{}", err))
}
}
#[cfg(feature = "pcap")]
impl From<pcap_parser::PcapError> for DltParseError {
fn from(err: pcap_parser::PcapError) -> DltParseError {
DltParseError::Unrecoverable(format!("{}", err))
}
}
impl From<nom::Err<DltParseError>> for DltParseError {
fn from(ne: nom::Err<DltParseError>) -> Self {
nom_to_dlt_parse_error(ne, "")
}
}
impl From<nom::Err<(&[u8], nom::error::ErrorKind)>> for DltParseError {
fn from(err: nom::Err<(&[u8], nom::error::ErrorKind)>) -> DltParseError {
match err {
nom::Err::Incomplete(n) => {
let needed = match n {
nom::Needed::Size(s) => Some(s),
nom::Needed::Unknown => None,
};
DltParseError::IncompleteParse { needed }
}
nom::Err::Error((input, kind)) => DltParseError::ParsingHickup(format!(
"{:?} ({} bytes left in input)",
kind,
input.len()
)),
nom::Err::Failure((input, kind)) => DltParseError::Unrecoverable(format!(
"{:?} ({} bytes left in input)",
kind,
input.len()
)),
}
}
}
pub fn forward_to_next_storage_header(input: &[u8]) -> Option<(u64, &[u8])> {
let mut found = false;
let mut to_drop = 0usize;
for v in input.windows(DLT_PATTERN_SIZE) {
if v == DLT_PATTERN {
found = true;
break;
}
to_drop += 1;
}
if !found {
debug!(
"forward but no more storage header (input left {})",
input.len()
);
return None;
}
if to_drop > 0 {
trace!("Need to drop {} bytes to get to next message", to_drop);
}
trace!("forwarded {}", to_drop);
Some((to_drop as u64, &input[to_drop..]))
}
pub(crate) fn dlt_storage_header(
input: &[u8],
) -> IResult<&[u8], Option<(StorageHeader, u64)>, DltParseError> {
match forward_to_next_storage_header(input) {
Some((consumed, rest)) => {
let (input, (_, _, seconds, microseconds)) =
tuple((tag("DLT"), tag(&[0x01]), le_u32, le_u32))(rest).map_err(|ne| {
Error(nom_to_dlt_parse_error(
ne,
"Problems trying to parse DLT pattern",
))
})?;
let (after_string, ecu_id) = dlt_zero_terminated_string(input, 4)?;
Ok((
after_string,
Some((
StorageHeader {
timestamp: DltTimeStamp {
seconds,
microseconds,
},
ecu_id: ecu_id.to_string(),
},
consumed,
)),
))
}
None => {
warn!("Did not find another storage header in file");
Ok((&[], None))
}
}
}
fn maybe_parse_ecu_id(a: bool) -> impl Fn(&[u8]) -> IResult<&[u8], Option<&str>, DltParseError> {
fn parse_ecu_id_to_option(input: &[u8]) -> IResult<&[u8], Option<&str>, DltParseError> {
let (rest, ecu_id) = parse_ecu_id(input)?;
Ok((rest, Some(ecu_id)))
}
#[allow(clippy::unnecessary_wraps)]
fn parse_nothing_str(input: &[u8]) -> IResult<&[u8], Option<&str>, DltParseError> {
Ok((input, None))
}
if a {
parse_ecu_id_to_option
} else {
parse_nothing_str
}
}
fn maybe_parse_u32(a: bool) -> impl Fn(&[u8]) -> IResult<&[u8], Option<u32>, DltParseError> {
fn parse_u32_to_option(input: &[u8]) -> IResult<&[u8], Option<u32>, DltParseError> {
map(be_u32, Some)(input)
}
#[allow(clippy::unnecessary_wraps)]
fn parse_nothing_u32(input: &[u8]) -> IResult<&[u8], Option<u32>, DltParseError> {
Ok((input, None))
}
if a {
parse_u32_to_option
} else {
parse_nothing_u32
}
}
fn add_context(ne: nom::Err<DltParseError>, desc: String) -> nom::Err<DltParseError> {
match ne {
nom::Err::Incomplete(n) => nom::Err::Incomplete(n),
nom::Err::Error(e) => {
nom::Err::Error(DltParseError::ParsingHickup(format!("{}: {}", desc, e)))
}
nom::Err::Failure(e) => {
nom::Err::Error(DltParseError::Unrecoverable(format!("{}: {}", desc, e)))
}
}
}
fn nom_to_dlt_parse_error(ne: nom::Err<DltParseError>, desc: &str) -> DltParseError {
match ne {
nom::Err::Incomplete(nom::Needed::Size(needed)) => DltParseError::IncompleteParse {
needed: Some(needed),
},
nom::Err::Incomplete(nom::Needed::Unknown) => {
DltParseError::IncompleteParse { needed: None }
}
nom::Err::Error(e) => DltParseError::ParsingHickup(format!("{}: {}", desc, e)),
nom::Err::Failure(e) => DltParseError::Unrecoverable(format!("{}: {}", desc, e)),
}
}
pub(crate) fn dlt_standard_header(input: &[u8]) -> IResult<&[u8], StandardHeader, DltParseError> {
let (input, header_type_byte) = be_u8(input)?;
let has_ecu_id = (header_type_byte & WITH_ECU_ID_FLAG) != 0;
let has_session_id = (header_type_byte & WITH_SESSION_ID_FLAG) != 0;
let has_timestamp = (header_type_byte & WITH_TIMESTAMP_FLAG) != 0;
let (input, (message_counter, overall_length, ecu_id, session_id, timestamp)) = tuple((
be_u8,
be_u16,
maybe_parse_ecu_id(has_ecu_id),
maybe_parse_u32(has_session_id),
maybe_parse_u32(has_timestamp),
))(input)
.map_err(|ne: nom::Err<DltParseError>| {
Error(nom_to_dlt_parse_error(
ne,
"Problems parsing DLT standard header",
))
})?;
let has_extended_header = (header_type_byte & WITH_EXTENDED_HEADER_FLAG) != 0;
let all_headers_length = calculate_all_headers_length(header_type_byte);
if all_headers_length > overall_length {
return Err(Error(DltParseError::ParsingHickup(
"Header indecates wrong message length".to_string(),
)));
}
let payload_length = overall_length - all_headers_length;
Ok((
input,
StandardHeader::new(
header_type_byte >> 5 & 0b111,
if (header_type_byte & BIG_ENDIAN_FLAG) != 0 {
Endianness::Big
} else {
Endianness::Little
},
message_counter,
has_extended_header,
payload_length,
ecu_id.map(|r| r.to_string()),
session_id,
timestamp,
),
))
}
pub(crate) fn dlt_extended_header(input: &[u8]) -> IResult<&[u8], ExtendedHeader, DltParseError> {
let (i, (message_info, argument_count, app_id, context_id)) =
tuple((be_u8, be_u8, parse_ecu_id, parse_ecu_id))(input)?;
let verbose = (message_info & VERBOSE_FLAG) != 0;
match MessageType::try_from(message_info) {
Ok(message_type) => {
match message_type {
MessageType::Unknown(n) => {
warn!("unknown message type {:?}", n);
}
MessageType::Log(LogLevel::Invalid(n)) => {
warn!("unknown log level {}", n);
}
MessageType::Control(ControlType::Unknown(n)) => {
warn!("unknown control type {}", n);
}
MessageType::ApplicationTrace(ApplicationTraceType::Invalid(n)) => {
warn!("invalid application-trace type {}", n);
}
MessageType::NetworkTrace(NetworkTraceType::Invalid) => {
warn!("invalid application-trace type 0");
}
_ => (),
};
Ok((
i,
ExtendedHeader {
verbose,
argument_count,
message_type,
application_id: app_id.to_string(),
context_id: context_id.to_string(),
},
))
}
Err(e) => {
let msg = format!("invalid message type: {}", e);
Err(Error(DltParseError::ParsingHickup(msg)))
}
}
}
#[inline]
fn is_not_null(chr: u8) -> bool {
chr != 0x0
}
pub fn dlt_zero_terminated_string(s: &[u8], size: usize) -> IResult<&[u8], &str, DltParseError> {
let (rest_with_null, content_without_null) = take_while_m_n(0, size, is_not_null)(s)?;
let res_str = match nom::lib::std::str::from_utf8(content_without_null) {
Ok(content) => content,
Err(e) => {
let (valid, _) = content_without_null.split_at(e.valid_up_to());
unsafe { nom::lib::std::str::from_utf8_unchecked(valid) }
}
};
let missing = size - content_without_null.len();
let (rest, _) = take(missing)(rest_with_null)?;
Ok((rest, res_str))
}
fn dlt_variable_name<T: NomByteOrder>(input: &[u8]) -> IResult<&[u8], String, DltParseError> {
let (i, size) = T::parse_u16(input)?;
let (i2, name) = dlt_zero_terminated_string(i, size as usize)?;
Ok((i2, name.to_string()))
}
pub(crate) trait NomByteOrder: Clone + Copy + Eq + Ord + PartialEq + PartialOrd {
fn parse_u16(i: &[u8]) -> IResult<&[u8], u16, DltParseError>;
fn parse_i16(i: &[u8]) -> IResult<&[u8], i16, DltParseError>;
fn parse_u32(i: &[u8]) -> IResult<&[u8], u32, DltParseError>;
fn parse_i32(i: &[u8]) -> IResult<&[u8], i32, DltParseError>;
fn parse_f32(i: &[u8]) -> IResult<&[u8], f32, DltParseError>;
fn parse_u64(i: &[u8]) -> IResult<&[u8], u64, DltParseError>;
fn parse_i64(i: &[u8]) -> IResult<&[u8], i64, DltParseError>;
fn parse_f64(i: &[u8]) -> IResult<&[u8], f64, DltParseError>;
fn parse_u128(i: &[u8]) -> IResult<&[u8], u128, DltParseError>;
fn parse_i128(i: &[u8]) -> IResult<&[u8], i128, DltParseError>;
fn to_string(input: &[u8], width: usize) -> String;
}
macro_rules! impl_nombyteorder{($($fn_trait:ident $fn_nom:ident $tp:ident ,)*) => {
$(
#[inline]
fn $fn_trait(i: &[u8]) -> IResult<&[u8], $tp, DltParseError> {
$fn_nom(i)
}
)*
}}
impl NomByteOrder for BigEndian {
impl_nombyteorder!(
parse_u16 be_u16 u16,
parse_i16 be_i16 i16,
parse_u32 be_u32 u32,
parse_i32 be_i32 i32,
parse_f32 be_f32 f32,
parse_u64 be_u64 u64,
parse_i64 be_i64 i64,
parse_f64 be_f64 f64,
parse_u128 be_u128 u128,
parse_i128 be_i128 i128,
);
fn to_string(input: &[u8], width: usize) -> String {
let v = input
.iter()
.take(width)
.map(|b| format!("{:02x}", b))
.collect::<Vec<String>>()
.join("");
format!("0x{}", v)
}
}
#[allow(clippy::type_complexity)]
fn dlt_variable_name_and_unit<T: NomByteOrder>(
type_info: &TypeInfo,
) -> fn(&[u8]) -> IResult<&[u8], (Option<String>, Option<String>), DltParseError> {
if type_info.has_variable_info {
|input: &[u8]| -> IResult<&[u8], (Option<String>, Option<String>), DltParseError> {
let (i2, name_size_unit_size) = tuple((T::parse_u16, T::parse_u16))(input)?;
dbg_parsed("namesize, unitsize", input, i2, &name_size_unit_size);
let (i3, name) = dlt_zero_terminated_string(i2, name_size_unit_size.0 as usize)?;
dbg_parsed("name", i2, i3, &name);
let (rest, unit) = dlt_zero_terminated_string(i3, name_size_unit_size.1 as usize)?;
dbg_parsed("unit", i3, rest, &unit);
Ok((rest, (Some(name.to_string()), Some(unit.to_string()))))
}
} else {
|input| Ok((input, (None, None)))
}
}
impl NomByteOrder for LittleEndian {
impl_nombyteorder!(
parse_u16 le_u16 u16,
parse_i16 le_i16 i16,
parse_u32 le_u32 u32,
parse_i32 le_i32 i32,
parse_f32 le_f32 f32,
parse_u64 le_u64 u64,
parse_i64 le_i64 i64,
parse_f64 le_f64 f64,
parse_u128 le_u128 u128,
parse_i128 le_i128 i128,
);
fn to_string(input: &[u8], width: usize) -> String {
let v = input
.iter()
.take(width)
.rev()
.map(|b| format!("{:02x}", b))
.collect::<Vec<String>>()
.join("");
format!("0x{}", v)
}
}
#[allow(clippy::type_complexity)]
pub(crate) fn dlt_uint<T: NomByteOrder>(
width: TypeLength,
) -> fn(&[u8]) -> IResult<&[u8], Value, DltParseError> {
match width {
TypeLength::BitLength8 => |i| map(be_u8, Value::U8)(i),
TypeLength::BitLength16 => |i| map(T::parse_u16, Value::U16)(i),
TypeLength::BitLength32 => |i| map(T::parse_u32, Value::U32)(i),
TypeLength::BitLength64 => |i| map(T::parse_u64, Value::U64)(i),
TypeLength::BitLength128 => |i| map(T::parse_u128, Value::U128)(i),
}
}
#[allow(clippy::type_complexity)]
pub(crate) fn dlt_sint<T: NomByteOrder>(
width: TypeLength,
) -> fn(&[u8]) -> IResult<&[u8], Value, DltParseError> {
match width {
TypeLength::BitLength8 => |i| map(be_i8, Value::I8)(i),
TypeLength::BitLength16 => |i| map(T::parse_i16, Value::I16)(i),
TypeLength::BitLength32 => |i| map(T::parse_i32, Value::I32)(i),
TypeLength::BitLength64 => |i| map(T::parse_i64, Value::I64)(i),
TypeLength::BitLength128 => |i| map(T::parse_i128, Value::I128)(i),
}
}
#[allow(clippy::type_complexity)]
pub(crate) fn dlt_fint<T: NomByteOrder>(
width: FloatWidth,
) -> fn(&[u8]) -> IResult<&[u8], Value, DltParseError> {
match width {
FloatWidth::Width32 => |i| map(T::parse_f32, Value::F32)(i),
FloatWidth::Width64 => |i| map(T::parse_f64, Value::F64)(i),
}
}
pub(crate) fn dlt_type_info<T: NomByteOrder>(
input: &[u8],
) -> IResult<&[u8], TypeInfo, DltParseError> {
let (i, info) = T::parse_u32(input)?;
match TypeInfo::try_from(info) {
Ok(type_info) => {
trace!(
"type_info parsed input: {:02X?} => {:#b}",
&input[..4],
info
);
Ok((i, type_info))
}
Err(_) => {
let err_msg = format!("dlt_type_info failed to parse {}", T::to_string(input, 4));
Err(nom::Err::Error(DltParseError::ParsingHickup(err_msg)))
}
}
}
pub(crate) fn dlt_fixed_point<T: NomByteOrder>(
input: &[u8],
width: FloatWidth,
) -> IResult<&[u8], FixedPoint, DltParseError> {
let (i, quantization) = T::parse_f32(input)?;
if width == FloatWidth::Width32 {
let (rest, offset) = T::parse_i32(i)?;
Ok((
rest,
FixedPoint {
quantization,
offset: FixedPointValue::I32(offset),
},
))
} else if width == FloatWidth::Width64 {
let (rest, offset) = T::parse_i64(i)?;
Ok((
rest,
FixedPoint {
quantization,
offset: FixedPointValue::I64(offset),
},
))
} else {
let err_msg = "error in dlt_fixed_point".to_string();
Err(nom::Err::Error(DltParseError::ParsingHickup(err_msg)))
}
}
pub(crate) fn dlt_argument<T: NomByteOrder>(
input: &[u8],
) -> IResult<&[u8], Argument, DltParseError> {
let (i, type_info) = dlt_type_info::<T>(input)?;
dbg_parsed("type info", input, i, &type_info);
match type_info.kind {
TypeInfoKind::Signed(width) => {
let (before_val, name_unit) = dlt_variable_name_and_unit::<T>(&type_info)(i)?;
dbg_parsed("name and unit", i, before_val, &name_unit);
let (rest, value) = dlt_sint::<T>(width)(before_val)?;
dbg_parsed("sint", before_val, rest, &value);
Ok((
rest,
Argument {
name: name_unit.0,
unit: name_unit.1,
value,
fixed_point: None,
type_info,
},
))
}
TypeInfoKind::SignedFixedPoint(width) => {
let (before_val, name_unit) = dlt_variable_name_and_unit::<T>(&type_info)(i)?;
dbg_parsed("name and unit", i, before_val, &name_unit);
let (r, fp) = dlt_fixed_point::<T>(before_val, width)?;
let (after_fixed_point, fixed_point) = (r, Some(fp));
dbg_parsed("fixed_point", before_val, after_fixed_point, &fixed_point);
let (rest, value) =
dlt_sint::<T>(float_width_to_type_length(width))(after_fixed_point)?;
Ok((
rest,
Argument {
name: name_unit.0,
unit: name_unit.1,
value,
fixed_point,
type_info,
},
))
}
TypeInfoKind::Unsigned(width) => {
let (before_val, (name, unit)) = dlt_variable_name_and_unit::<T>(&type_info)(i)?;
let (rest, value) = dlt_uint::<T>(width)(before_val)?;
dbg_parsed("unsigned", before_val, rest, &value);
Ok((
rest,
Argument {
name,
unit,
value,
fixed_point: None,
type_info,
},
))
}
TypeInfoKind::UnsignedFixedPoint(width) => {
let (before_val, (name, unit)) = dlt_variable_name_and_unit::<T>(&type_info)(i)?;
let (after_fixed_point, fixed_point) = {
let (r, fp) = dlt_fixed_point::<T>(before_val, width)?;
(r, Some(fp))
};
let (rest, value) =
dlt_uint::<T>(float_width_to_type_length(width))(after_fixed_point)?;
Ok((
rest,
Argument {
type_info,
name,
unit,
fixed_point,
value,
},
))
}
TypeInfoKind::Float(width) => {
let (rest, ((name, unit), value)) = tuple((
dlt_variable_name_and_unit::<T>(&type_info),
dlt_fint::<T>(width),
))(i)?;
Ok((
rest,
Argument {
name,
unit,
value,
fixed_point: None,
type_info,
},
))
}
TypeInfoKind::Raw => {
let (i2, raw_byte_cnt) = T::parse_u16(i)?;
let (i3, name) = if type_info.has_variable_info {
map(dlt_variable_name::<T>, Some)(i2)?
} else {
(i2, None)
};
let (rest, value) = map(take(raw_byte_cnt), |s: &[u8]| Value::Raw(s.to_vec()))(i3)?;
Ok((
rest,
Argument {
name,
unit: None,
value,
fixed_point: None,
type_info,
},
))
}
TypeInfoKind::Bool => {
let (after_var_name, name) = if type_info.has_variable_info {
map(dlt_variable_name::<T>, Some)(i)?
} else {
(i, None)
};
dbg_parsed("var name", i, after_var_name, &name);
let (rest, bool_value) = be_u8(after_var_name)?;
dbg_parsed("bool value", after_var_name, rest, &bool_value);
Ok((
rest,
Argument {
type_info,
name,
unit: None,
fixed_point: None,
value: Value::Bool(bool_value),
},
))
}
TypeInfoKind::StringType => {
let (i2, size) = T::parse_u16(i)?;
let (i3, name) = if type_info.has_variable_info {
map(dlt_variable_name::<T>, Some)(i2)?
} else {
(i2, None)
};
let (rest, value) = dlt_zero_terminated_string(i3, size as usize)?;
dbg_parsed("StringType", i3, rest, &value);
Ok((
rest,
Argument {
name,
unit: None,
fixed_point: None,
value: Value::StringVal(value.to_string()),
type_info,
},
))
}
}
}
#[allow(dead_code)]
struct DltArgumentParser {
current_index: Option<usize>,
}
fn dlt_payload<T: NomByteOrder>(
input: &[u8],
verbose: bool,
payload_length: u16,
arg_cnt: u8,
is_controll_msg: bool,
) -> IResult<&[u8], PayloadContent, DltParseError> {
if verbose {
match count(dlt_argument::<T>, arg_cnt as usize)(input) {
Ok((rest, arguments)) => Ok((rest, PayloadContent::Verbose(arguments))),
Err(e) => Err(add_context(
e,
format!("Problem parsing {} arguments", arg_cnt),
)),
}
} else if is_controll_msg {
if payload_length < 1 {
return Err(nom::Err::Failure(DltParseError::ParsingHickup(format!(
"error, payload too short {}",
payload_length
))));
}
match tuple((nom::number::complete::be_u8, take(payload_length - 1)))(input) {
Ok((rest, (control_msg_id, payload))) => Ok((
rest,
PayloadContent::ControlMsg(
ControlType::from_value(control_msg_id),
payload.to_vec(),
),
)),
Err(e) => Err(e),
}
} else {
if input.len() < 4 {
return Err(nom::Err::Failure(DltParseError::ParsingHickup(format!(
"error, payload too short {}",
input.len()
))));
}
match tuple((T::parse_u32, take(payload_length - 4)))(input) {
Ok((rest, (message_id, payload))) => Ok((
rest,
PayloadContent::NonVerbose(message_id, payload.to_vec()),
)),
Err(e) => Err(e),
}
}
}
#[inline]
fn dbg_parsed<T: std::fmt::Debug>(_name: &str, _before: &[u8], _after: &[u8], _value: &T) {
{
let input_len = _before.len();
let now_len = _after.len();
let parsed_len = input_len - now_len;
if parsed_len == 0 {
trace!("{}: not parsed", _name);
} else {
trace!(
"parsed {} ({} bytes: {:02X?}) => {:?}",
_name,
parsed_len,
&_before[0..parsed_len],
_value
);
}
}
}
#[derive(Debug, PartialEq)]
pub enum ParsedMessage {
Item(Message),
FilteredOut(usize),
Invalid,
}
pub fn dlt_message<'a>(
input: &'a [u8],
filter_config_opt: Option<&filtering::ProcessedDltFilterConfig>,
with_storage_header: bool,
) -> Result<(&'a [u8], ParsedMessage), DltParseError> {
dlt_message_intern(input, filter_config_opt, with_storage_header).map_err(DltParseError::from)
}
fn dlt_message_intern<'a>(
input: &'a [u8],
filter_config_opt: Option<&filtering::ProcessedDltFilterConfig>,
with_storage_header: bool,
) -> IResult<&'a [u8], ParsedMessage, DltParseError> {
let (after_storage_header, storage_header_shifted): (&[u8], Option<(StorageHeader, u64)>) =
if with_storage_header {
dlt_storage_header(input)?
} else {
(input, None)
};
if let Some((storage_header, shifted)) = &storage_header_shifted {
dbg_parsed(
"storage header",
&input[(*shifted as usize)..],
&after_storage_header,
&storage_header,
)
};
let (after_storage_and_normal_header, header) = dlt_standard_header(after_storage_header)?;
dbg_parsed(
"normal header",
&after_storage_header,
&after_storage_and_normal_header,
&header,
);
let payload_length_res = validated_payload_length(&header, input.len());
let mut verbose: bool = false;
let mut is_controll_msg = false;
let mut arg_count = 0;
let (after_headers, extended_header) = if header.has_extended_header {
let (rest, ext_header) = dlt_extended_header(after_storage_and_normal_header)?;
verbose = ext_header.verbose;
arg_count = ext_header.argument_count;
is_controll_msg = matches!(ext_header.message_type, MessageType::Control(_));
dbg_parsed(
"extended header",
&after_storage_and_normal_header,
&rest,
&ext_header,
);
(rest, Some(ext_header))
} else {
(after_storage_and_normal_header, None)
};
let payload_length = match payload_length_res {
Ok(length) => length,
Err(e) => {
warn!("No validated payload length: {}", e);
return Ok((after_storage_and_normal_header, ParsedMessage::Invalid));
}
};
if filtered_out(
extended_header.as_ref(),
filter_config_opt,
header.ecu_id.as_ref(),
) {
let (after_message, _) = take(payload_length)(after_headers)?;
return Ok((
after_message,
ParsedMessage::FilteredOut(payload_length as usize),
));
}
let (i, payload) = if header.endianness == Endianness::Big {
dlt_payload::<BigEndian>(
after_headers,
verbose,
payload_length,
arg_count,
is_controll_msg,
)?
} else {
dlt_payload::<LittleEndian>(
after_headers,
verbose,
payload_length,
arg_count,
is_controll_msg,
)?
};
dbg_parsed("payload", &after_headers, &i, &payload);
Ok((
i,
ParsedMessage::Item(Message {
storage_header: storage_header_shifted.map(|shs| shs.0),
header,
extended_header,
payload,
}),
))
}
fn filtered_out(
extended_header: Option<&ExtendedHeader>,
filter_config_opt: Option<&filtering::ProcessedDltFilterConfig>,
ecu_id: Option<&String>,
) -> bool {
if let Some(filter_config) = filter_config_opt {
if let Some(h) = &extended_header {
if let Some(min_filter_level) = filter_config.min_log_level {
if h.skip_with_level(min_filter_level) {
return true;
}
}
if let Some(only_these_components) = &filter_config.app_ids {
if !only_these_components.contains(&h.application_id) {
return true;
}
}
if let Some(only_these_context_ids) = &filter_config.context_ids {
if !only_these_context_ids.contains(&h.context_id) {
return true;
}
}
if let Some(only_these_ecu_ids) = &filter_config.ecu_ids {
if let Some(ecu_id) = ecu_id {
if !only_these_ecu_ids.contains(ecu_id) {
return true;
}
}
}
} else {
if let Some(app_id_set) = &filter_config.app_ids {
if filter_config.app_id_count > app_id_set.len() as i64 {
return true;
}
}
if let Some(context_id_set) = &filter_config.context_ids {
if filter_config.context_id_count > context_id_set.len() as i64 {
return true;
}
}
}
}
false
}
pub(crate) fn validated_payload_length(
header: &StandardHeader,
remaining_bytes: usize,
) -> Result<u16, DltParseError> {
let message_length = header.overall_length();
let headers_length = calculate_all_headers_length(header.header_type_byte());
if message_length < headers_length {
return Err(DltParseError::ParsingHickup(
"Parsed message-length is less then the length of all headers".to_string(),
));
}
let payload_length = message_length - headers_length;
if payload_length as usize > remaining_bytes {
return Err(DltParseError::ParsingHickup (
"Payload length seems to be longer then the remaining bytes, message-length is malformed".to_string(),
));
}
Ok(message_length - headers_length)
}
pub(crate) fn skip_till_after_next_storage_header(
input: &[u8],
) -> Result<(&[u8], u64), DltParseError> {
match forward_to_next_storage_header(input) {
Some((consumed, rest)) => {
let (after_storage_header, skipped_bytes) = skip_storage_header(rest)?;
Ok((after_storage_header, consumed + skipped_bytes))
}
None => Err(DltParseError::ParsingHickup(
"did not find another storage header".into(),
)),
}
}
pub fn skip_storage_header(input: &[u8]) -> IResult<&[u8], u64, DltParseError> {
let (i, (_, _, _)): (&[u8], _) = tuple((tag("DLT"), tag(&[0x01]), take(12usize)))(input)?;
if input.len() - i.len() == STORAGE_HEADER_LENGTH as usize {
Ok((i, STORAGE_HEADER_LENGTH))
} else {
Err(Error(DltParseError::ParsingHickup(
"did not match DLT pattern".into(),
)))
}
}
pub fn dlt_consume_msg(input: &[u8]) -> IResult<&[u8], Option<u64>, DltParseError> {
let (after_storage_header, skipped_bytes) = skip_storage_header(input)?;
let (_, header) = dlt_standard_header(after_storage_header)?;
let overall_length_without_storage_header = header.overall_length() as u64;
let (after_message, _) = take(overall_length_without_storage_header)(after_storage_header)?;
let consumed = skipped_bytes + overall_length_without_storage_header;
Ok((after_message, Some(consumed)))
}