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use core::fmt::Debug;
use core::{slice, str};
use crate::elf;
use crate::endian::{self, Endianness};
use crate::pod::{self, Pod};
use crate::read::{self, ObjectSegment, ReadError, ReadRef, SegmentFlags};
use super::{ElfFile, FileHeader, NoteIterator};
/// An iterator for the segments in an [`ElfFile32`](super::ElfFile32).
pub type ElfSegmentIterator32<'data, 'file, Endian = Endianness, R = &'data [u8]> =
ElfSegmentIterator<'data, 'file, elf::FileHeader32<Endian>, R>;
/// An iterator for the segments in an [`ElfFile64`](super::ElfFile64).
pub type ElfSegmentIterator64<'data, 'file, Endian = Endianness, R = &'data [u8]> =
ElfSegmentIterator<'data, 'file, elf::FileHeader64<Endian>, R>;
/// An iterator for the segments in an [`ElfFile`].
#[derive(Debug)]
pub struct ElfSegmentIterator<'data, 'file, Elf, R = &'data [u8]>
where
Elf: FileHeader,
R: ReadRef<'data>,
{
pub(super) file: &'file ElfFile<'data, Elf, R>,
pub(super) iter: slice::Iter<'data, Elf::ProgramHeader>,
}
impl<'data, 'file, Elf, R> Iterator for ElfSegmentIterator<'data, 'file, Elf, R>
where
Elf: FileHeader,
R: ReadRef<'data>,
{
type Item = ElfSegment<'data, 'file, Elf, R>;
fn next(&mut self) -> Option<Self::Item> {
for segment in self.iter.by_ref() {
if segment.p_type(self.file.endian) == elf::PT_LOAD {
return Some(ElfSegment {
file: self.file,
segment,
});
}
}
None
}
}
/// A segment in an [`ElfFile32`](super::ElfFile32).
pub type ElfSegment32<'data, 'file, Endian = Endianness, R = &'data [u8]> =
ElfSegment<'data, 'file, elf::FileHeader32<Endian>, R>;
/// A segment in an [`ElfFile64`](super::ElfFile64).
pub type ElfSegment64<'data, 'file, Endian = Endianness, R = &'data [u8]> =
ElfSegment<'data, 'file, elf::FileHeader64<Endian>, R>;
/// A segment in an [`ElfFile`].
///
/// Most functionality is provided by the [`ObjectSegment`] trait implementation.
#[derive(Debug)]
pub struct ElfSegment<'data, 'file, Elf, R = &'data [u8]>
where
Elf: FileHeader,
R: ReadRef<'data>,
{
pub(super) file: &'file ElfFile<'data, Elf, R>,
pub(super) segment: &'data Elf::ProgramHeader,
}
impl<'data, 'file, Elf: FileHeader, R: ReadRef<'data>> ElfSegment<'data, 'file, Elf, R> {
/// Get the ELF file containing this segment.
pub fn elf_file(&self) -> &'file ElfFile<'data, Elf, R> {
self.file
}
/// Get the raw ELF program header for the segment.
pub fn elf_program_header(&self) -> &'data Elf::ProgramHeader {
self.segment
}
fn bytes(&self) -> read::Result<&'data [u8]> {
self.segment
.data(self.file.endian, self.file.data)
.read_error("Invalid ELF segment size or offset")
}
}
impl<'data, 'file, Elf, R> read::private::Sealed for ElfSegment<'data, 'file, Elf, R>
where
Elf: FileHeader,
R: ReadRef<'data>,
{
}
impl<'data, 'file, Elf, R> ObjectSegment<'data> for ElfSegment<'data, 'file, Elf, R>
where
Elf: FileHeader,
R: ReadRef<'data>,
{
#[inline]
fn address(&self) -> u64 {
self.segment.p_vaddr(self.file.endian).into()
}
#[inline]
fn size(&self) -> u64 {
self.segment.p_memsz(self.file.endian).into()
}
#[inline]
fn align(&self) -> u64 {
self.segment.p_align(self.file.endian).into()
}
#[inline]
fn file_range(&self) -> (u64, u64) {
self.segment.file_range(self.file.endian)
}
#[inline]
fn data(&self) -> read::Result<&'data [u8]> {
self.bytes()
}
fn data_range(&self, address: u64, size: u64) -> read::Result<Option<&'data [u8]>> {
Ok(read::util::data_range(
self.bytes()?,
self.address(),
address,
size,
))
}
#[inline]
fn name_bytes(&self) -> read::Result<Option<&[u8]>> {
Ok(None)
}
#[inline]
fn name(&self) -> read::Result<Option<&str>> {
Ok(None)
}
#[inline]
fn flags(&self) -> SegmentFlags {
let p_flags = self.segment.p_flags(self.file.endian);
SegmentFlags::Elf { p_flags }
}
}
/// A trait for generic access to [`elf::ProgramHeader32`] and [`elf::ProgramHeader64`].
#[allow(missing_docs)]
pub trait ProgramHeader: Debug + Pod {
type Elf: FileHeader<ProgramHeader = Self, Endian = Self::Endian, Word = Self::Word>;
type Word: Into<u64>;
type Endian: endian::Endian;
fn p_type(&self, endian: Self::Endian) -> u32;
fn p_flags(&self, endian: Self::Endian) -> u32;
fn p_offset(&self, endian: Self::Endian) -> Self::Word;
fn p_vaddr(&self, endian: Self::Endian) -> Self::Word;
fn p_paddr(&self, endian: Self::Endian) -> Self::Word;
fn p_filesz(&self, endian: Self::Endian) -> Self::Word;
fn p_memsz(&self, endian: Self::Endian) -> Self::Word;
fn p_align(&self, endian: Self::Endian) -> Self::Word;
/// Return the offset and size of the segment in the file.
fn file_range(&self, endian: Self::Endian) -> (u64, u64) {
(self.p_offset(endian).into(), self.p_filesz(endian).into())
}
/// Return the segment data.
///
/// Returns `Err` for invalid values.
fn data<'data, R: ReadRef<'data>>(
&self,
endian: Self::Endian,
data: R,
) -> Result<&'data [u8], ()> {
let (offset, size) = self.file_range(endian);
data.read_bytes_at(offset, size)
}
/// Return the segment data as a slice of the given type.
///
/// Allows padding at the end of the data.
/// Returns `Ok(&[])` if the segment has no data.
/// Returns `Err` for invalid values, including bad alignment.
fn data_as_array<'data, T: Pod, R: ReadRef<'data>>(
&self,
endian: Self::Endian,
data: R,
) -> Result<&'data [T], ()> {
pod::slice_from_all_bytes(self.data(endian, data)?)
}
/// Return the segment data in the given virtual address range
///
/// Returns `Ok(None)` if the segment does not contain the address.
/// Returns `Err` for invalid values.
fn data_range<'data, R: ReadRef<'data>>(
&self,
endian: Self::Endian,
data: R,
address: u64,
size: u64,
) -> Result<Option<&'data [u8]>, ()> {
Ok(read::util::data_range(
self.data(endian, data)?,
self.p_vaddr(endian).into(),
address,
size,
))
}
/// Return entries in a dynamic segment.
///
/// Returns `Ok(None)` if the segment is not `PT_DYNAMIC`.
/// Returns `Err` for invalid values.
fn dynamic<'data, R: ReadRef<'data>>(
&self,
endian: Self::Endian,
data: R,
) -> read::Result<Option<&'data [<Self::Elf as FileHeader>::Dyn]>> {
if self.p_type(endian) != elf::PT_DYNAMIC {
return Ok(None);
}
let dynamic = self
.data_as_array(endian, data)
.read_error("Invalid ELF dynamic segment offset or size")?;
Ok(Some(dynamic))
}
/// Return the data in an interpreter segment.
///
/// Returns `Ok(None)` if the segment is not `PT_INTERP`.
/// Returns `Err` for invalid values.
fn interpreter<'data, R: ReadRef<'data>>(
&self,
endian: Self::Endian,
data: R,
) -> read::Result<Option<&'data [u8]>> {
if self.p_type(endian) != elf::PT_INTERP {
return Ok(None);
}
let data = self
.data(endian, data)
.read_error("Invalid ELF interpreter segment offset or size")?;
let len = data
.iter()
.position(|&b| b == 0)
.read_error("Invalid ELF interpreter segment data")?;
Ok(Some(&data[..len]))
}
/// Return a note iterator for the segment data.
///
/// Returns `Ok(None)` if the segment does not contain notes.
/// Returns `Err` for invalid values.
fn notes<'data, R: ReadRef<'data>>(
&self,
endian: Self::Endian,
data: R,
) -> read::Result<Option<NoteIterator<'data, Self::Elf>>> {
if self.p_type(endian) != elf::PT_NOTE {
return Ok(None);
}
let data = self
.data(endian, data)
.read_error("Invalid ELF note segment offset or size")?;
let notes = NoteIterator::new(endian, self.p_align(endian), data)?;
Ok(Some(notes))
}
}
impl<Endian: endian::Endian> ProgramHeader for elf::ProgramHeader32<Endian> {
type Word = u32;
type Endian = Endian;
type Elf = elf::FileHeader32<Endian>;
#[inline]
fn p_type(&self, endian: Self::Endian) -> u32 {
self.p_type.get(endian)
}
#[inline]
fn p_flags(&self, endian: Self::Endian) -> u32 {
self.p_flags.get(endian)
}
#[inline]
fn p_offset(&self, endian: Self::Endian) -> Self::Word {
self.p_offset.get(endian)
}
#[inline]
fn p_vaddr(&self, endian: Self::Endian) -> Self::Word {
self.p_vaddr.get(endian)
}
#[inline]
fn p_paddr(&self, endian: Self::Endian) -> Self::Word {
self.p_paddr.get(endian)
}
#[inline]
fn p_filesz(&self, endian: Self::Endian) -> Self::Word {
self.p_filesz.get(endian)
}
#[inline]
fn p_memsz(&self, endian: Self::Endian) -> Self::Word {
self.p_memsz.get(endian)
}
#[inline]
fn p_align(&self, endian: Self::Endian) -> Self::Word {
self.p_align.get(endian)
}
}
impl<Endian: endian::Endian> ProgramHeader for elf::ProgramHeader64<Endian> {
type Word = u64;
type Endian = Endian;
type Elf = elf::FileHeader64<Endian>;
#[inline]
fn p_type(&self, endian: Self::Endian) -> u32 {
self.p_type.get(endian)
}
#[inline]
fn p_flags(&self, endian: Self::Endian) -> u32 {
self.p_flags.get(endian)
}
#[inline]
fn p_offset(&self, endian: Self::Endian) -> Self::Word {
self.p_offset.get(endian)
}
#[inline]
fn p_vaddr(&self, endian: Self::Endian) -> Self::Word {
self.p_vaddr.get(endian)
}
#[inline]
fn p_paddr(&self, endian: Self::Endian) -> Self::Word {
self.p_paddr.get(endian)
}
#[inline]
fn p_filesz(&self, endian: Self::Endian) -> Self::Word {
self.p_filesz.get(endian)
}
#[inline]
fn p_memsz(&self, endian: Self::Endian) -> Self::Word {
self.p_memsz.get(endian)
}
#[inline]
fn p_align(&self, endian: Self::Endian) -> Self::Word {
self.p_align.get(endian)
}
}