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//!This Crate Provides functionality, for injecting dlls into other processes.
//!Most of the crate is right now accessible through the [Injector] class.
//!
//!You will need to provide a pid, and a dll to inject. This crate will do the rest for you.
//!
//! The main focus will always be on performing the injection reliable.
//! If you care about injecting into a 64 bit application whilst needing to compile this library under 32 bits, you will want to enable the "x86tox64" feature.
//! Be aware, that that feature uses "unofficial" api's located in ntdll.dll.
//! Compatibility is technically not guaranteed by windows.
//!
//!If you have any suggestions, on improving the outfacing api of this crate create an issue, or pr.
//!I am not sure yet, if I like this design.
//!
//!Linux support will probably not come.
//!It is insanely hard and platform specific, because
//! 1. we would need to write raw machinecode/shellcode to the target process.
//! 3. which then has the necessary code to load the .so
//! 4. we need to somehow redirect the target program's execution, to execute our code
//! 5. we need to do that, without somehow disrupting ANY of the program's code
//! 6. we need to return the EXACT state before we did anything, because the other program may need that
//!
//! If this library is supposed to be helpful I'd want to not require to run it as root.
//! Unfortunately some steps involve calling ptrace. Access to the command is restricted, if you are not the parent process of the process you are trying to trace.
//! These requirements would mean, that we can only inject so files to processes, that the program this library itself created.
// #![feature(strict_provenance)]
// #![warn(lossy_provenance_casts)]
#![warn(missing_docs)]
#![cfg_attr(not(feature = "std"), no_std)]
#[cfg(feature = "alloc")]
extern crate alloc;
#[cfg(not(feature = "alloc"))]
compile_error!("inject_lib doesn't yet support no alloc environments");
extern crate core;
use alloc::vec::Vec;
use core::fmt::{Display, Formatter};
///This struct will expose certain module private functions, to actually use the api.
///The exact contents should be considered implementation detail.
#[derive(Debug, Clone)]
#[non_exhaustive]
pub struct Injector<'a> {
///The path to a dll. This may be in any format, that rust understands
pub dll: Data<'a>,
///The pid the dll should be injected into
pub pid: u32,
}
pub(crate) type Result<T, V = error::Error> = core::result::Result<T, V>;
pub(crate) use log::{debug, error, info, trace, warn};
///Holds all error types
pub mod error;
mod platforms;
///This represents the actions, that are supported with a dll.
pub trait Inject {
///Injects a dll
fn inject(&self) -> Result<()>;
///Ejects a dll
fn eject(&self) -> Result<()>;
///This Function will find all currently processes, with a given name.
///Even if no processes are found, an empty Vector should return.
fn find_pid(name: Data) -> Result<alloc::vec::Vec<u32>>;
}
///Data can be a Path(if we have std), or a String.
///Data will get handled differently in no_std and std scenarios
#[derive(Debug, Copy, Clone, PartialEq, Eq, PartialOrd, Ord)]
pub enum Data<'a> {
///This a Path as a String
Str(&'a str),
///This is a Path encoded as a Path std object
#[cfg(feature = "std")]
Path(&'a std::path::Path),
}
impl<'a> Display for Data<'a> {
fn fmt(&self, f: &mut Formatter<'_>) -> core::fmt::Result {
match self {
Data::Str(s) => write!(f, "{}", s),
#[cfg(feature = "std")]
Data::Path(p) => write!(f, "{}", p.to_string_lossy()),
}
}
}
impl<'a> Data<'a> {
fn get_str(&self) -> Option<&'a str> {
match self {
Data::Str(a) => Some(a),
_ => None,
}
}
#[cfg(feature = "std")]
fn get_path(&self) -> Option<&'a std::path::Path> {
match self {
Data::Path(a) => Some(a),
_ => None,
}
}
}
impl<'a> Injector<'a> {
///Create a new Injector object.
pub fn new(dll: Data<'a>, pid: u32) -> Self {
Injector { dll, pid }
}
///Sets the dll
pub fn set_dll(&mut self, dll: Data<'a>) {
self.dll = dll;
}
///Sets the pid
pub fn set_pid(&mut self, pid: u32) {
self.pid = pid;
}
#[cfg(target_family = "windows")]
///Gets the Platform specific Injector.
///Currently only windows is supported.
///wait indicates, if we should wait on the dll to attach to the process
pub fn inject(&self, wait: bool) -> impl Inject + '_ {
platforms::windows::InjectWin { inj: self, wait }
}
#[cfg(target_family = "windows")]
///This Function will find all currently processes, with a given name.
///Even if no processes are found, an empty Vector should return.
pub fn find_pid(name: Data) -> Result<alloc::vec::Vec<u32>> {
platforms::windows::InjectWin::find_pid(name)
}
}
impl<'a> Default for Injector<'a> {
fn default() -> Self {
Self::new(crate::Data::Str(""), 0)
}
}
// #[cfg(feature = "std")]
// ///This takes a string, and returns only the last path element
// ///Since this uses rust builtins, it should "just work".
// pub fn strip_path(dll: &str) -> Result<String> {
// let pb = std::path::PathBuf::from(dll);
// match pb.file_name().and_then(|x| x.to_str()) {
// None => Err(error::Error::Io(std::io::Error::from(
// std::io::ErrorKind::Unsupported,
// ))),
// Some(v) => Ok(v.to_string()),
// }
// }
///This truncates all 0 from the end of a Vec
///This will keep other 0 entries in the Vec perfectly intact.
///This has a worst case performance of o(n).
///if fast==true, the data MUST only contain NULL-values at the end of the string O(log n)
///else O(n)
pub fn trim_wide_str<const FAST: bool>(v: &[u16]) -> &[u16] {
let i = {
if FAST {
v.partition_point(|x| *x != 0)
} else {
let mut len = v.len();
while v[len - 1] == 0 {
len -= 1;
}
len
}
};
let (out, _) = v.split_at(i);
return out;
}
///Returns a function, which compares [crate::Data] against some other [crate::Data].
///If in no_std enviromenmt, the comparison is affected by forward-slash vs back-slash
//todo: make the second function call better
fn cmp<'a>(name: crate::Data<'a>) -> impl Fn(crate::Data<'_>) -> bool + 'a {
move |s| {
return match name {
crate::Data::Str(s2) => match s {
crate::Data::Str(s) => s2.ends_with(s) || s.ends_with(s2),
#[cfg(feature = "std")]
crate::Data::Path(p) => {
let p1 = std::path::Path::new(s2);
p1.ends_with(p) || p.ends_with(p1)
}
},
#[cfg(feature = "std")]
crate::Data::Path(p2) => match s {
crate::Data::Str(s) => {
let p1 = std::path::Path::new(s);
p1.ends_with(p2) || p2.ends_with(p1)
}
#[cfg(feature = "std")]
crate::Data::Path(p) => p.ends_with(p2) || p2.ends_with(p),
},
};
}
}
#[cfg(test)]
mod test {
use alloc::vec::Vec;
///This string contains a bunch of special chars, to test methods operating on strings.
pub const STR:&str = "This is just any string, since we are not testing anything else, other than setting the dll.!'\r\n\t%$§\"{\\[()]}=?´`öäü^°,.-;:_#+*~<>|³²@";
use crate::Result;
#[test]
fn trim_vec() {
let buf: Vec<u16> = (1..u16::MAX).collect();
let mut buf2 = buf.clone();
buf2.append(&mut [0u16; 100].to_vec());
assert_eq!(super::trim_wide_str::<true>(buf2.as_slice()), buf);
assert_eq!(super::trim_wide_str::<false>(buf2.as_slice()), buf);
}
// #[test]
// fn strip_path() -> Result<()> {
// #[cfg(target_family = "windows")]
// assert_eq!(
// super::strip_path("C:\\this\\is\\a\\test\\path\\with\\a\\dir\\at\\the\\end\\")?,
// "end",
// "strip path failed to strip the end of a win path, with a dir at the end"
// );
// assert_eq!(
// super::strip_path("/this/is/a/test/path/with/a/dir/at/the/end/")?,
// "end",
// "strip path failed to strip the end of a rust path, with a dir at the end"
// );
// #[cfg(target_family = "windows")]
// assert_eq!(super::strip_path("C:\\this\\is\\a\\test\\path\\with\\a\\dir\\at\\the\\end")?,"end","strip path failed to strip the end of a win path, with a dir/extensionless file at the end");
// assert_eq!(super::strip_path("/this/is/a/test/path/with/a/dir/at/the/end")?,"end","strip path failed to strip the end of a rust path, with a dir/extensionless file at the end");
// #[cfg(target_family = "windows")]
// assert_eq!(
// super::strip_path(
// "C:\\this\\is\\a\\test\\path\\with\\a\\file\\at\\the\\end\\file.txt"
// )?,
// "file.txt",
// "strip path failed to strip the end of a win path, with a file at the end"
// );
// assert_eq!(
// super::strip_path("/this/is/a/test/path/with/a/file/at/the/end/file.txt")?,
// "file.txt",
// "strip path failed to strip the end of a rust path, with a file at the end"
// );
// Ok(())
// }
#[test]
fn set_dll() {
let mut inj = super::Injector::default();
let dll = crate::Data::Str(STR);
inj.set_dll(dll);
assert_eq!(inj.dll, dll, "Setter did not correctly set the dll string");
}
#[test]
fn set_pid() {
let mut inj = super::Injector::default();
const PID: u32 = 0;
inj.set_pid(PID);
assert_eq!(inj.pid, PID, "Setter did not correctly set the PID");
}
#[test]
#[cfg(target_os = "windows")]
fn cmp() {
simple_logger::SimpleLogger::new().init().ok();
//Simple case
{
let f = super::cmp(crate::Data::Str("test"));
assert!(f(crate::Data::Str("test")));
assert!(f(crate::Data::Str("something test")));
assert!(!f(crate::Data::Str("something 1351")));
let f = super::cmp(crate::Data::Str("KERNEL32.DLL"));
assert!(f(crate::Data::Str("C:\\Windows\\System32\\KERNEL32.DLL")));
let f = super::cmp(crate::Data::Str("ntdll.dll"));
assert!(f(crate::Data::Str("C:\\Windows\\SYSTEM32\\ntdll.dll")));
}
//complicated paths
#[cfg(feature = "std")]
{
let f = std::vec![
super::cmp(crate::Data::Path(std::path::Path::new(
r"C:\this\is\a\test\path\with\a\dir\at\the\end\"
))),
super::cmp(crate::Data::Path(std::path::Path::new(
r"C:\this\is\a\test\path\with\a\dir\at\the\end"
))),
super::cmp(crate::Data::Path(std::path::Path::new(
"C:/this/is/a/test/path/with/a/dir/at/the/end/"
))),
super::cmp(crate::Data::Path(std::path::Path::new(
"C:/this/is/a/test/path/with/a/dir/at/the/end"
))),
];
for f in f {
assert!(f(crate::Data::Str("end")));
assert!(f(crate::Data::Str("the\\end")));
assert!(f(crate::Data::Str("the/end")));
assert!(f(crate::Data::Str("at/the\\end")));
assert!(f(crate::Data::Str("at\\the/end")));
assert!(f(crate::Data::Path(std::path::Path::new("end"))));
assert!(f(crate::Data::Path(std::path::Path::new("the\\end"))));
assert!(f(crate::Data::Path(std::path::Path::new("the/end"))));
assert!(f(crate::Data::Path(std::path::Path::new("at/the\\end"))));
assert!(f(crate::Data::Path(std::path::Path::new("at\\the/end"))));
}
}
{
let f = super::cmp(crate::Data::Str(
r"C:\this\is\a\test\path\with\a\dir\at\the\end\",
));
assert!(!f(crate::Data::Str("end")));
assert!(!f(crate::Data::Str(r"the\end")));
assert!(f(crate::Data::Str(r"end\")));
let f = super::cmp(crate::Data::Str(
r"C:\this\is\a\test\path\with\a\dir\at\the\end",
));
assert!(f(crate::Data::Str("end")));
assert!(f(crate::Data::Str(r"the\end")));
assert!(!f(crate::Data::Str(r"end\")));
assert!(!f(crate::Data::Str(r"the\end\")));
let f = super::cmp(crate::Data::Str(
"C:/this/is/a/test/path/with/a/dir/at/the/end/",
));
assert!(f(crate::Data::Str("end/")));
assert!(f(crate::Data::Str("the/end/")));
assert!(!f(crate::Data::Str("end")));
assert!(!f(crate::Data::Str("the/end")));
let f = super::cmp(crate::Data::Str(
"C:/this/is/a/test/path/with/a/dir/at/the/end",
));
assert!(f(crate::Data::Str("end")));
assert!(!f(crate::Data::Str("end/")));
assert!(!f(crate::Data::Str("the/end/")));
}
}
}