Add program/section header parser

src/elf_parser.rs

@@ -1,16 +1,126 @@
-use nom::{IResult, bytes::complete::tag, number::complete::{le_u16, le_u32, le_u64}};
+use nom::{IResult, bytes::complete::{tag, take}, number::complete::{le_u16, le_u32, le_u64}};
 
-use crate::elf_struct::ElfHeader;
+use crate::elf_struct::{Elf, ElfHeader, ProgramHeader, SectionHeader};
 
 pub struct ElfParser {
     pub file: Vec<u8>
 }
 
 impl ElfParser {
-    pub fn parse_header(input: &[u8]) -> IResult<&[u8], u64> {
+    
-        let (input, ident) = le_u64(input)?;
+    pub fn parse(&mut self) -> IResult<&[u8], Elf> {
+        let (input_headerless, elf_header) = ElfParser::parse_header(&self.file)?;
+        let (mut input, _) = take(elf_header.program_header_offset - 64)(input_headerless)?;
+
+        let mut program_header_counter = 0;
+        let mut program_headers: Vec<ProgramHeader> = vec![];
+        while program_header_counter < elf_header.program_header_num {
+            let (input_tmp, program_header) = ElfParser::parse_program_header(input)?;
+            program_headers.push(program_header);
+            input = input_tmp;
+            program_header_counter += 1;
+        }
+
+        let (mut input, _) = take(elf_header.section_header_offset - 64)(input_headerless)?;
+
+        let mut section_header_counter = 0;
+        let mut section_headers: Vec<SectionHeader> = vec![];
+        while section_header_counter < elf_header.section_header_num {
+            let (input_tmp, section_header) = ElfParser::parse_section_header(input)?;
+            section_headers.push(section_header);
+            input = input_tmp;
+            section_header_counter += 1;
+        }        
+
+        Ok((input, Elf {
+            header: elf_header,
+            program_headers,
+            section_headers
+        }))
+    }
+
+    pub fn parse_section_header(input: &[u8]) -> IResult<&[u8], SectionHeader> {
+        let (input, name) = le_u32(input)?;
+        let (input, section_header_type) = le_u32(input)?;
+        let (input, flags) = le_u64(input)?;
+        let (input, address) = le_u64(input)?;
+        let (input, offset) = le_u64(input)?;
+        let (input, size) = le_u64(input)?;
+        let (input, link) = le_u32(input)?;
+        let (input, info) = le_u32(input)?;
+        let (input, align) = le_u64(input)?;
+        let (input, entry_size) = le_u64(input)?;
+
+        Ok((input, SectionHeader {
+            name,
+            section_header_type,
+            flags,
+            address,
+            offset,
+            size,
+            link,
+            info,
+            align,
+            entry_size
+        }))
+    }
+
+    pub fn parse_program_header(input: &[u8]) -> IResult<&[u8], ProgramHeader> {
+        let (input, program_type) = le_u32(input)?;
+        let (input, flags) = le_u32(input)?;
+        let (input, offset) = le_u64(input)?;
+        let (input, virtual_address) = le_u64(input)?;
+        let (input, physical_address) = le_u64(input)?;
+        let (input, file_size) = le_u64(input)?;
+        let (input, memory_size) = le_u64(input)?;
+        let (input, align) = le_u64(input)?;
+
+        Ok((input, ProgramHeader {
+            program_type,
+            flags,
+            offset,
+            virtual_address,
+            physical_address,
+            file_size,
+            memory_size,
+            align
+        }))
+    }
+
+    pub fn parse_header(input: &[u8]) -> IResult<&[u8], ElfHeader> {
+        let (input, ident_1) = le_u64(input)?;
+        let (input, ident_2) = le_u64(input)?;
         let (input, elf_type) = le_u16(input)?;
+        let (input, machine) = le_u16(input)?;
         let (input, version) = le_u32(input)?;
-        Ok((input, ident))
+        let (input, entry) = le_u64(input)?;
+        let (input, program_header_offset) = le_u64(input)?;
+        let (input, section_header_offset) = le_u64(input)?;
+        let (input, flags) = le_u32(input)?;
+        let (input, elf_header_size) = le_u16(input)?;
+        let (input, program_header_entry_size) = le_u16(input)?;
+        let (input, program_header_num) = le_u16(input)?;
+        let (input, section_header_entry_size) = le_u16(input)?;
+        let (input, section_header_num) = le_u16(input)?;
+        let (input, section_header_name_index) = le_u16(input)?;
+
+        Ok((input, ElfHeader {
+            ident: (ident_1, ident_2),
+            elf_type,
+            machine,
+            version,
+            entry,
+            program_header_offset,
+            section_header_offset,
+            flags,
+            elf_header_size,
+            program_header_entry_size,
+            program_header_num,
+            section_header_entry_size,
+            section_header_num,
+            section_header_name_index
+        }))
     }
 }
+
+// 192

src/elf_struct.rs

@@ -1,6 +1,27 @@
 #[derive(Debug)]
+pub struct Elf {
+    pub header: ElfHeader,
+    pub program_headers: Vec<ProgramHeader>,
+    pub section_headers: Vec<SectionHeader>
+}
+
+#[derive(Debug)]
+pub struct SectionHeader {
+    pub name: u32,
+    pub section_header_type: u32,
+    pub flags: u64,
+    pub address: u64,
+    pub offset: u64,
+    pub size: u64,
+    pub link: u32,
+    pub info: u32,
+    pub align: u64,
+    pub entry_size: u64
+}
+
+#[derive(Debug, Clone, Copy)]
 pub struct ElfHeader {
-    pub magic_number: u64,
+    pub ident: (u64, u64),
     pub elf_type: u16,
     pub machine: u16,
     pub version: u32,
@@ -15,3 +36,54 @@ pub struct ElfHeader {
     pub section_header_num: u16,
     pub section_header_name_index: u16
 }
+/*
++-----------------------------------------------+
+|e_ident[EI_NIDENT]                             |
++-----------------------------------------------+
+|7f 45 4c 46 02 01 01 00 00 00 00 00 00 00 00 00|
++-----+-----+-----------+-----------------------+
+|type |mach |ver        |e_entry                |
++-----+-----+-----------+-----------------------+
+|02 00|3e 00|01 00 00 00|78 00 40 00 00 00 00 00|
++-----+-----+-----------+-----------------------+
+|e_phoff                |e_shoff                |
++-----------------------+-----------------------+
+|40 00 00 00 00 00 00 00|00 00 00 00 00 00 00 00|
++-----------+-----+-----+-----+-----+-----+-----+
+|e_flags    |ehsiz|phesi|phnum|shesi|shnum|shstr|
++-----------+-----+-----+-----+-----+-----+-----+
+|00 00 00 00|40 00|38 00|01 00|40 00|00 00|00 00|
++-----------+-----+-----+-----+-----+-----+-----+
+*/
+
+#[derive(Debug)]
+pub struct ProgramHeader {
+    pub program_type: u32,
+    pub flags: u32,
+    pub offset: u64,
+    pub virtual_address: u64,
+    pub physical_address: u64,
+    pub file_size: u64,
+    pub memory_size: u64,
+    pub align: u64
+}
+/*
++-----------+-----------+-----------------------+
+|p_type     |p_flags    |p_offset               |
++-----------+-----------+-----------------------+
+|01 00 00 00|07 00 00 00|00 00 00 00 00 00 00 00|
++-----------+-----------+-----------------------+
+|p_vaddr                |p_paddr                |
++-----------------------+-----------------------+
+|00 00 40 00 00 00 00 00|00 00 40 00 00 00 00 00|
++-----------------------+-----------------------+
+|p_filesz               |p_memsz                |
++-----------------------+-----------------------+
+|90 00 00 00 00 00 00 00|90 00 00 00 00 00 00 00|
++-----------------------+-----------------------+
+|p_align                |
++-----------------------+
+|00 00 20 00 00 00 00 00|
++-----------------------+
+*/
+

src/main.rs

@@ -5,23 +5,23 @@ use std::io::Read;
 use crate::elf_parser::ElfParser;
 
 fn main() {
-    println!("Hello, world!");
     let mut file = std::fs::File::open("./test.elf").expect("Failed to open a file.");
     let mut buf = Vec::new();
     file.read_to_end(&mut buf).expect("Failed to read a file.");
     let mut elf_parser = ElfParser { file: buf };
 
-    match ElfParser::parse_header(&elf_parser.file) {
+    match elf_parser.parse() {
-        Ok(input) => {
+        Ok((_, elf)) => {
-            println!("{:?}", input.0[0]);
+            println!("{:?}", elf.header);
-            println!("{:?}", input.0[1]);
+            for program_header in elf.program_headers {
-            println!("{:?}", input.0[2]);
+                println!("{:?}", program_header);
-            println!("{:?}", input.0[3]);
+            }
-            println!("{:?}", input.1);
+
+            for section_header in elf.section_headers {
+                println!("{:?}", section_header);
+            }
         },
-        Err(_) => {
+        Err(_) => {}
-            println!("Error.");
     }
 }
-}
+// 1236
-// 282584257676671