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scan.rs
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scan.rs
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use std::convert::TryInto;
use std::ffi::{CStr, CString};
use std::fs::File;
use std::os::raw::c_void;
#[cfg(unix)]
use std::os::unix::io::AsRawFd;
#[cfg(windows)]
use std::os::windows::io::AsRawHandle;
use yara_sys::{YR_SCANNER, YR_SCAN_CONTEXT};
use crate::errors::*;
use crate::Rule;
#[derive(Debug)]
pub enum CallbackMsg<'r> {
RuleMatching(Rule<'r>),
RuleNotMatching,
ScanFinished,
ImportModule,
ModuleImported,
UnknownMsg,
}
impl<'r> CallbackMsg<'r> {
fn from_yara(context: *mut YR_SCAN_CONTEXT, message: i32, message_data: *mut c_void) -> Self {
use self::CallbackMsg::*;
match message as u32 {
yara_sys::CALLBACK_MSG_RULE_MATCHING => {
let rule = unsafe { &*(message_data as *mut yara_sys::YR_RULE) };
let context = unsafe { &*context };
RuleMatching(Rule::from((context, rule)))
}
yara_sys::CALLBACK_MSG_RULE_NOT_MATCHING => RuleNotMatching,
yara_sys::CALLBACK_MSG_SCAN_FINISHED => ScanFinished,
yara_sys::CALLBACK_MSG_IMPORT_MODULE => ImportModule,
yara_sys::CALLBACK_MSG_MODULE_IMPORTED => ModuleImported,
_ => UnknownMsg,
}
}
}
#[derive(Copy, Clone, Debug, Eq, PartialEq)]
pub enum CallbackReturn {
Continue,
Abort,
Error,
}
impl CallbackReturn {
pub fn to_yara(self) -> i32 {
use self::CallbackReturn::*;
let res = match self {
Continue => yara_sys::CALLBACK_CONTINUE,
Abort => yara_sys::CALLBACK_ABORT,
Error => yara_sys::CALLBACK_ERROR,
};
res as i32
}
}
pub fn rules_scan_mem<'a>(
rules: *mut yara_sys::YR_RULES,
mem: &[u8],
timeout: i32,
flags: i32,
callback: impl FnMut(CallbackMsg<'a>) -> CallbackReturn,
) -> Result<(), YaraError> {
let p_callback: Box<dyn FnMut(CallbackMsg<'a>) -> CallbackReturn> = Box::new(callback);
let result = unsafe {
yara_sys::yr_rules_scan_mem(
rules,
mem.as_ptr(),
mem.len().try_into().unwrap(),
flags,
Some(scan_callback),
&p_callback as *const Box<dyn FnMut(CallbackMsg<'a>) -> CallbackReturn> as *mut _,
timeout,
)
};
yara_sys::Error::from_code(result)
.map_err(|e| e.into())
.map(|_| ())
}
/// Scan a buffer with the provided YR_SCANNER and its defined external vars.
///
/// Setting the callback function modifies the Scanner with no locks preventing
/// data races, so it should only be called from a &mut Scanner.
pub fn scanner_scan_mem<'a>(
scanner: *mut yara_sys::YR_SCANNER,
mem: &[u8],
callback: impl FnMut(CallbackMsg<'a>) -> CallbackReturn,
) -> Result<(), YaraError> {
let p_callback: Box<dyn FnMut(CallbackMsg<'a>) -> CallbackReturn> = Box::new(callback);
let result = unsafe {
yara_sys::yr_scanner_set_callback(
scanner,
Some(scan_callback),
&p_callback as *const Box<dyn FnMut(CallbackMsg<'a>) -> CallbackReturn> as *mut _,
);
yara_sys::yr_scanner_scan_mem(scanner, mem.as_ptr(), mem.len().try_into().unwrap())
};
yara_sys::Error::from_code(result)
.map_err(|e| e.into())
.map(|_| ())
}
pub fn rules_scan_file<'a>(
rules: *mut yara_sys::YR_RULES,
file: &File,
timeout: i32,
flags: i32,
callback: impl FnMut(CallbackMsg<'a>) -> CallbackReturn,
) -> Result<(), YaraError> {
let result = rules_scan_raw(rules, file, timeout, flags, callback);
yara_sys::Error::from_code(result)
.map_err(|e| e.into())
.map(|_| ())
}
/// Scan a file with the provided YR_SCANNER and its defined external vars.
///
/// Setting the callback function modifies the Scanner with no locks preventing
/// data races, so it should only be called from a &mut Scanner.
pub fn scanner_scan_file<'a>(
scanner: *mut yara_sys::YR_SCANNER,
file: &File,
callback: impl FnMut(CallbackMsg<'a>) -> CallbackReturn,
) -> Result<(), YaraError> {
let result = scanner_scan_raw(scanner, file, callback);
yara_sys::Error::from_code(result)
.map_err(|e| e.into())
.map(|_| ())
}
#[cfg(unix)]
pub fn rules_scan_raw<'a>(
rules: *mut yara_sys::YR_RULES,
file: &File,
timeout: i32,
flags: i32,
callback: impl FnMut(CallbackMsg<'a>) -> CallbackReturn,
) -> i32 {
let fd = file.as_raw_fd();
let p_callback: Box<dyn FnMut(CallbackMsg<'a>) -> CallbackReturn> = Box::new(callback);
unsafe {
yara_sys::yr_rules_scan_fd(
rules,
fd,
flags,
Some(scan_callback),
&p_callback as *const Box<dyn FnMut(CallbackMsg<'a>) -> CallbackReturn> as *mut _,
timeout,
)
}
}
#[cfg(windows)]
pub fn rules_scan_raw<'a>(
rules: *mut yara_sys::YR_RULES,
file: &File,
timeout: i32,
flags: i32,
callback: impl FnMut(CallbackMsg<'a>) -> CallbackReturn,
) -> i32 {
let handle = file.as_raw_handle();
let p_callback: Box<dyn FnMut(CallbackMsg<'a>) -> CallbackReturn> = Box::new(callback);
unsafe {
yara_sys::yr_rules_scan_fd(
rules,
handle,
flags,
Some(scan_callback),
&p_callback as *const Box<dyn FnMut(CallbackMsg<'a>) -> CallbackReturn> as *mut _,
timeout,
)
}
}
#[cfg(unix)]
/// Scan a file with the provided YR_SCANNER and its defined external vars.
///
/// Setting the callback function modifies the Scanner with no locks preventing
/// data races, so it should only be called from a &mut Scanner.
pub fn scanner_scan_raw<'a>(
scanner: *mut yara_sys::YR_SCANNER,
file: &File,
callback: impl FnMut(CallbackMsg<'a>) -> CallbackReturn,
) -> i32 {
let fd = file.as_raw_fd();
let p_callback: Box<dyn FnMut(CallbackMsg<'a>) -> CallbackReturn> = Box::new(callback);
unsafe {
yara_sys::yr_scanner_set_callback(
scanner,
Some(scan_callback),
&p_callback as *const Box<dyn FnMut(CallbackMsg<'a>) -> CallbackReturn> as *mut _,
);
yara_sys::yr_scanner_scan_fd(scanner, fd)
}
}
#[cfg(windows)]
/// Scan a file with the provided YR_SCANNER and its defined external vars.
///
/// Setting the callback function modifies the Scanner with no locks preventing
/// data races, so it should only be called from a &mut Scanner.
pub fn scanner_scan_raw<'a>(
scanner: *mut yara_sys::YR_SCANNER,
file: &File,
callback: impl FnMut(CallbackMsg<'a>) -> CallbackReturn,
) -> i32 {
let handle = file.as_raw_handle();
let p_callback: Box<dyn FnMut(CallbackMsg<'a>) -> CallbackReturn> = Box::new(callback);
unsafe {
yara_sys::yr_scanner_set_callback(
scanner,
Some(scan_callback),
&p_callback as *const Box<dyn FnMut(CallbackMsg<'a>) -> CallbackReturn> as *mut _,
);
yara_sys::yr_scanner_scan_fd(scanner, handle)
}
}
/// Attach a process, pause it, and scan its memory.
pub fn rules_scan_proc<'a>(
rules: *mut yara_sys::YR_RULES,
pid: u32,
timeout: i32,
flags: i32,
callback: impl FnMut(CallbackMsg<'a>) -> CallbackReturn,
) -> Result<(), YaraError> {
let p_callback: Box<dyn FnMut(CallbackMsg<'a>) -> CallbackReturn> = Box::new(callback);
let result = unsafe {
yara_sys::yr_rules_scan_proc(
rules,
pid as i32,
flags,
Some(scan_callback),
&p_callback as *const Box<dyn FnMut(CallbackMsg<'a>) -> CallbackReturn> as *mut _,
timeout,
)
};
yara_sys::Error::from_code(result)
.map_err(|e| e.into())
.map(|_| ())
}
/// Attach a process, pause it, and scan its memory with the provided YR_SCANNER
/// and its defined external vars.
///
/// Setting the callback function modifies the Scanner with no locks preventing
/// data races, so it should only be called from a &mut Scanner.
pub fn scanner_scan_proc<'a>(
scanner: *mut yara_sys::YR_SCANNER,
pid: u32,
callback: impl FnMut(CallbackMsg<'a>) -> CallbackReturn,
) -> Result<(), YaraError> {
let p_callback: Box<Box<dyn FnMut(CallbackMsg<'a>) -> CallbackReturn>> =
Box::new(Box::new(callback));
let user_data = Box::into_raw(p_callback) as *mut c_void;
let result = unsafe {
yara_sys::yr_scanner_set_callback(scanner, Some(scan_callback), user_data);
yara_sys::yr_scanner_scan_proc(scanner, pid as i32)
};
let _: Box<Box<dyn FnMut(CallbackMsg<'a>) -> CallbackReturn>> =
unsafe { Box::from_raw(user_data as *mut _) };
yara_sys::Error::from_code(result)
.map_err(|e| e.into())
.map(|_| ())
}
extern "C" fn scan_callback(
context: *mut YR_SCAN_CONTEXT,
message: i32,
message_data: *mut c_void,
user_data: *mut c_void,
) -> i32 {
let message = CallbackMsg::from_yara(context, message, message_data);
let callback: &mut Box<dyn FnMut(CallbackMsg) -> CallbackReturn> =
unsafe { std::mem::transmute(user_data) };
callback(message).to_yara()
}
/// Setting the flags modifies the Scanner with no locks preventing data races,
/// so it should only be called from a &mut Scanner.
pub fn scanner_set_flags<'a>(scanner: *mut yara_sys::YR_SCANNER, flags: i32) {
unsafe {
yara_sys::yr_scanner_set_flags(scanner, flags);
}
}
/// Setting the timeout modifies the Scanner with no locks preventing data races,
/// so it should only be called from a &mut Scanner.
pub fn scanner_set_timeout<'a>(scanner: *mut yara_sys::YR_SCANNER, seconds: i32) {
unsafe {
yara_sys::yr_scanner_set_timeout(scanner, seconds);
}
}
pub fn scanner_define_integer_variable(
scanner: *mut YR_SCANNER,
identifier: &str,
value: i64,
) -> Result<(), YaraError> {
let identifier = CString::new(identifier).unwrap();
let result = unsafe {
yara_sys::yr_scanner_define_integer_variable(scanner, identifier.as_ptr(), value)
};
yara_sys::Error::from_code(result).map_err(Into::into)
}
pub fn scanner_define_boolean_variable(
scanner: *mut YR_SCANNER,
identifier: &str,
value: bool,
) -> Result<(), YaraError> {
let identifier = CString::new(identifier).unwrap();
let value = if value { 1 } else { 0 };
let result = unsafe {
yara_sys::yr_scanner_define_boolean_variable(scanner, identifier.as_ptr(), value)
};
yara_sys::Error::from_code(result).map_err(Into::into)
}
pub fn scanner_define_float_variable(
scanner: *mut YR_SCANNER,
identifier: &str,
value: f64,
) -> Result<(), YaraError> {
let identifier = CString::new(identifier).unwrap();
let result =
unsafe { yara_sys::yr_scanner_define_float_variable(scanner, identifier.as_ptr(), value) };
yara_sys::Error::from_code(result).map_err(Into::into)
}
pub fn scanner_define_str_variable(
scanner: *mut YR_SCANNER,
identifier: &str,
value: &str,
) -> Result<(), YaraError> {
let identifier = CString::new(identifier).unwrap();
let value = CString::new(value).unwrap();
let result = unsafe {
yara_sys::yr_scanner_define_string_variable(scanner, identifier.as_ptr(), value.as_ptr())
};
yara_sys::Error::from_code(result).map_err(Into::into)
}
pub fn scanner_define_cstr_variable(
scanner: *mut YR_SCANNER,
identifier: &str,
value: &CStr,
) -> Result<(), YaraError> {
let identifier = CString::new(identifier).unwrap();
let result = unsafe {
yara_sys::yr_scanner_define_string_variable(scanner, identifier.as_ptr(), value.as_ptr())
};
yara_sys::Error::from_code(result).map_err(Into::into)
}