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pub mod error;
use error::MemoryResult;
use regex::Regex;
fn is_sub(mut haystack: &[u8], needle: &[u8]) -> Option<usize> {
if needle.len() == 0 {
return Some(0);
}
let mut offset = 0;
while !haystack.is_empty() {
if haystack.starts_with(needle) {
return Some(offset);
}
haystack = &haystack[1..];
offset += 1;
}
None
}
fn structure_is_sub<T: DefaultInit>(mut haystack: &[u8]) -> Option<usize> {
let mut offset = 0;
while !haystack.is_empty() {
let first_entry_ptr = &haystack[0] as *const u8;
if haystack.len() < std::mem::size_of::<T>() {
break;
}
if unsafe {
(*std::mem::transmute::<*const u8, *const T>(first_entry_ptr)).is_default_init()
} {
return Some(offset);
}
haystack = &haystack[1..];
offset += 1;
}
None
}
fn wildcard_is_sub(mut haystack: &[u8], needle: &[Option<u8>]) -> Option<usize> {
if needle.len() == 0 {
return Some(0);
}
let mut offset = 0;
while !haystack.is_empty() {
let starts_with = needle
.iter()
.zip(haystack.iter())
.map(|(n, h)| {
if let Some(val) = n {
match val == h {
true => Some(()),
false => None,
}
} else {
Some(())
}
})
.collect::<Option<()>>();
if starts_with == Some(()) && haystack.len() >= needle.len() {
return Some(offset);
}
haystack = &haystack[1..];
offset += 1;
}
None
}
pub trait DefaultInit {
/// Returns true if the values are equal the default initialisation
fn is_default_init(&self) -> bool;
}
pub trait MemoryManipulation {
/// Reads into the buffer at the given address and returns the bytes read
fn read(&self, address: usize, buf: &mut [u8]) -> MemoryResult<usize>;
/// Writes the payload into the memory at the given address
fn write(&self, address: usize, payload: &[u8]) -> MemoryResult<usize>;
/// Reads a generic datastructure at the given address
fn read_structure<T>(&self, address: usize) -> MemoryResult<&mut T> {
let mut buf = vec![0_u8; std::mem::size_of::<T>()];
self.read(address, &mut buf)?;
Ok(unsafe { std::mem::transmute::<*mut u8, &mut T>(&mut buf[0] as *mut u8) })
}
/// Writes a generic datastructure into memory at the given address
fn write_structure<T>(&self, address: usize, payload: T) -> MemoryResult<usize> {
let payload = unsafe { std::mem::transmute::<&T, *const u8>(&payload) };
self.write(address, unsafe {
std::slice::from_raw_parts(payload, std::mem::size_of::<T>())
})
}
// fn find_len(
// &self,
// start: usize,
// current: usize,
// end: usize,
// buffer_len: usize,
// signature: &[u8],
// ) -> Option<usize> {
// if buffer_len > (end - start) / 4 {
// return None;
// }
// if current + buffer_len > end {
// return self.find_len(start, current, end, buffer_len * 2, signature);
// return None;
// }
// let mut buffer = vec![0_u8; buffer_len];
// match self.read(current, &mut buffer) {
// Ok(_) => (),
// Err(_) => return None,
// }
// match is_sub(&mut buffer, signature) {
// Some(addr) => Some(current + addr),
// None => self.find_len(current, current + buffer_len, end, buffer_len, signature),
// }
// }
// fn find(&self, start: usize, end: usize, signature: &[u8]) -> Option<usize> {
// self.find_len(
// start,
// start,
// end,
// std::mem::size_of_val(signature) * 4,
// signature,
// )
// }
/// Searches for the given signature between the start and end address
/// Not guranteed to find signature, until Rust supports Tail Call Optimization
fn find(&self, start: usize, end: usize, signature: &[u8]) -> Option<usize> {
(start..end)
.step_by(std::mem::size_of_val(signature) * 4) // here i cannot gurantee that i do not slice into the searched signature
.into_iter()
.find_map(|addr| {
let mut buffer = vec![0_u8; std::mem::size_of_val(signature) * 4];
match self.read(addr, &mut buffer) {
Ok(_) => (),
Err(_) => return None,
}
match is_sub(&mut buffer, signature) {
Some(inner) => Some(addr + inner),
None => None,
}
})
}
/// Searches for a structure with special default values
/// Not guranteed to find signature, until Rust supports Tail Call Optimization
fn find_structure<T: DefaultInit>(&self, start: usize, end: usize) -> Option<usize> {
(start..end)
.step_by(std::mem::size_of::<T>() * 4) // here i cannot gurantee that i do not slice into the searched signature
.into_iter()
.find_map(|addr| {
let mut buffer = vec![0_u8; std::mem::size_of::<T>() * 4];
match self.read(addr, &mut buffer) {
Ok(_) => (),
Err(_) => return None,
}
match structure_is_sub::<T>(&mut buffer) {
Some(inner) => Some(addr + inner),
None => None,
}
})
}
/// Searches for a given pattern where wildcards are specified with ::
/// Not guranteed to find signature, until Rust supports Tail Call Optimization
fn find_wildcard(&self, start: usize, end: usize, signature: &str) -> Option<usize> {
let re = Regex::new(r"[[:xdigit:]][[:xdigit:]]|::").unwrap();
let signature = re
.captures_iter(signature)
.into_iter()
.map(|caps| {
caps.get(0)
.map(|m| match u8::from_str_radix(m.as_str(), 16) {
Ok(num) => Some(num),
Err(_) => None,
})
.unwrap_or(None)
})
.collect::<Vec<Option<u8>>>();
(start..end)
.step_by(signature.len() * 4) // here i cannot gurantee that i do not slice into the searched signature
.into_iter()
.find_map(|addr| {
let mut buffer = vec![0_u8; signature.len() * 4];
match self.read(addr, &mut buffer) {
Ok(_) => (),
Err(_) => return None,
}
match wildcard_is_sub(&mut buffer, &signature) {
Some(inner) => Some(addr + inner),
None => None,
}
})
}
}