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use crate::call;
use crate::syscall::Direction;
use crate::value::helpers::{skip_if_2, skip_if_3};
use crate::value::kind::*;
use crate::value::Value;
use crate::value::AV;
use crate::TraceError;
use crate::Tracer;
use nix::libc;
use num_traits::FromPrimitive;
use std::mem;
pub(crate) struct ValueTransformer<'a, T>
where
T: Tracer,
{
pub pid: usize,
pub ptrace: &'a mut T,
pub var_type: &'a AV,
pub previous_variable: Option<&'a Value>,
pub variables: Option<&'a [Value]>,
pub value: u64,
pub dir: Direction,
pub return_value: Option<i64>, // FIXME use result here
}
impl<'a, T> ValueTransformer<'a, T>
where
T: Tracer,
{
pub fn to_type<A>(&mut self) -> Result<A, crate::TraceError> {
let mut dst: A = unsafe { std::mem::zeroed() };
let address = match self.dir {
Direction::Out => match self.previous_variable {
Some(value) => match value {
Value::SizeT(addr) => *addr,
_ => return Err(TraceError::ToTypeError),
},
None => return Err(TraceError::ToTypeError),
},
Direction::In => self.value as usize,
_ => return Err(TraceError::ToTypeError),
};
self.ptrace
.read_memory_to_destination(self.pid, address, &mut dst as *mut A)?;
Ok(dst)
}
/// FIXME refactor this to return Option<>, also run the value setting (e.g. getting from memory) only when direction matches
/// performance and soundness improvement
/// FIXME: where bit flags truncate is used, do actually checking and warn if extra flags are present
///
pub fn to_value(&mut self) -> Result<Value, TraceError>
where
T: Tracer,
{
// if we must finally read OUT-value, read the memory address at IN-stage, and store it temporarily
if self.dir == Direction::In {
match &self.var_type {
AV::CString(d) | AV::BufferFromReturn(d) | AV::CStruct(d, _) => {
if d == &Direction::Out {
return Ok(Value::SizeT(self.value as usize));
}
}
_ => (),
}
}
let out = match &self.var_type {
AV::CStruct(d, c) => c.map_value(d, self)?,
AV::CString(d2) => {
if *d2 == Direction::In && self.dir == Direction::In {
// input string, get directly
Value::CString(
self.ptrace
.find_string_from_memory(self.pid, self.value as usize)?,
)
} else if *d2 == Direction::Out && self.dir == Direction::Out {
// output, get the memory address from previous temporary
match self.previous_variable.unwrap() {
Value::SizeT(address) => {
Value::CString(self.ptrace.find_string_from_memory(self.pid, *address)?)
}
_ => {
return Err(TraceError::StringError(
"prev_self.inp was None".to_string(),
))
}
}
} else {
Value::Skip
}
}
AV::BufferFromArgPosition(d2, size_arg_position) => {
skip_if_3(&self.dir.clone(), d2, || {
// get struct size (from next parameter)
let size = match &self.variables.as_ref().unwrap()[*size_arg_position] {
Value::SizeT(i) => *i,
_ => {
return Err(TraceError::StringError(format!(
"Failed to get size_t() from position {}",
*size_arg_position
)));
}
} as usize;
// FIXME limit read? to max print size...
Ok(Value::Buffer(self.ptrace.read_memory_to_vec(
self.pid,
self.value as usize,
size,
)?))
})?
}
AV::BufferFromReturn(d2) => {
if *d2 == Direction::Out && self.dir == Direction::Out {
// output, get the memory address from previous temporary
match self.previous_variable.unwrap() {
// FIXME use Result here
Value::SizeT(address) => match self.return_value {
Some(v) => {
if v > 0 {
Value::Buffer(
self.ptrace
.read_memory_to_vec(self.pid, *address, v as usize)?,
)
} else {
Value::MemoryAddress(MemoryAddress(self.value as usize))
}
}
None => return Err(TraceError::StringError(
"Return_value was not present, should've been (this is internal error"
.into(),
)),
},
_ => Value::Failure,
}
} else {
Value::Failure
}
}
AV::AddressFamily(d2) => skip_if_2(&self.dir, d2, || {
Value::AddressFamily(
FromPrimitive::from_u64(self.value).unwrap_or(call::AddressFamily::Unknown), // FIXME ?
)
}),
AV::SocketType(d2) => skip_if_2(&self.dir, d2, || {
Value::SocketType(call::SocketType::from_bits_truncate(self.value as isize))
}),
AV::Prot(d2) => skip_if_2(&self.dir, d2, || {
Value::Prot(call::Prot::from_bits_truncate(self.value as isize))
}),
/*
AV::SwapFlag(d2) => skip_if_2(&self.dir, d2, || {
Value::SwapFlag(call::SwapFlag::from_bits_truncate(self.value as isize))
}),
*/
AV::OpenatMode(d2) => skip_if_2(&self.dir, d2, || {
Value::OpenatMode(call::OpenatMode::from_bits_truncate(self.value as isize))
}),
AV::AccessMode(d2) => skip_if_2(&self.dir, d2, || {
Value::AccessMode(call::AccessMode::from_bits_truncate(self.value as isize))
}),
AV::MemoryAddress(d2) => skip_if_2(&self.dir, d2, || {
Value::MemoryAddress(MemoryAddress(self.value as usize))
}),
AV::Int(d2) => skip_if_2(&self.dir, d2, || {
/*println!(
"CONVERT INT {} to Value::Int: {:?}",
value,
value.to_ne_bytes()
);*/
Value::Int(self.value as isize)
}),
AV::UnsignedLong(d2) => {
skip_if_2(&self.dir, d2, || Value::UnsignedLong(self.value as usize))
}
AV::SizeT(d2) => skip_if_2(&self.dir, d2, || Value::SizeT(self.value as usize)),
AV::SSizeT(d2) => skip_if_2(&self.dir, d2, || Value::SSizeT(self.value as isize)), // FIXME flip bits)?
AV::OffT(d2) => skip_if_2(&self.dir, d2, || Value::OffT(self.value as usize)),
/*
AV::C_sysinfo(d2) => {
let mut sysinfo: from_c::sysinfo = unsafe { mem::zeroed() };
helpers::read_memory_to_destination(
&pid,
value as usize,
&mut sysinfo as *mut from_c::sysinfo,
);
skip_if_2(&dir, d2, move || {
// FIXME: for some reason bindgen can't derive(Clone)
Value::C_sysinfo(from_c::sysinfo {
uptime: sysinfo.uptime,
loads: sysinfo.loads,
totalram: sysinfo.totalram,
freeram: sysinfo.freeram,
sharedram: sysinfo.sharedram,
bufferram: sysinfo.bufferram,
totalswap: sysinfo.totalswap,
freeswap: sysinfo.freeswap,
procs: sysinfo.procs,
pad: sysinfo.pad,
totalhigh: sysinfo.totalhigh,
freehigh: sysinfo.freehigh,
mem_unit: sysinfo.mem_unit,
_f: from_c::__IncompleteArrayFieldirection::new(),
})
})
}
*/
AV::SockAddr(d, size_arg_position) => skip_if_3(&self.dir.clone(), d, || {
// get struct size (from next parameter)
let size = match &self.variables.as_ref().unwrap()[*size_arg_position] {
Value::Int(i) => *i as usize,
_ => {
return Err(TraceError::StringError(
"Could not find Int-value of desired field; internal error".to_string(),
))
}
};
// read memory as sockaddr
let mut sockaddr: libc::sockaddr = unsafe { mem::zeroed() };
const MAX_SOCKADDR_SIZE: usize = 1024;
let struct_size = mem::size_of::<libc::sockaddr>();
if size > MAX_SOCKADDR_SIZE || size < struct_size {
return Err(TraceError::MemoryCapacityError(
"sockaddr".into(),
size,
struct_size,
));
}
self.ptrace.read_memory_to_destination(
self.pid,
self.value as usize,
&mut sockaddr as *mut libc::sockaddr,
)?;
// interpret address_family from sockaddr
let address_family: call::AddressFamily =
match FromPrimitive::from_u16(sockaddr.sa_family) {
Some(d) => d,
None => {
return Ok(Value::SockAddr(call::SockAddr::__unknown(
sockaddr.sa_family as usize,
)))
}
};
// based on address_family, reinterpret the memory
let ret = match address_family {
call::AddressFamily::AF_UNIX => {
let mut sockaddr_un: libc::sockaddr_un = unsafe { mem::zeroed() };
let struct_size = mem::size_of::<libc::sockaddr_un>();
if size > struct_size {
return Err(TraceError::MemoryCapacityError(
"sockaddr_un".to_string(),
size,
struct_size,
));
}
self.ptrace.read_memory_to_destination(
self.pid,
self.value as usize,
&mut sockaddr_un as *mut libc::sockaddr_un,
)?;
Value::SockAddr(call::SockAddr::UNIX(sockaddr_un))
}
call::AddressFamily::AF_INET => {
let mut sockaddr_in: libc::sockaddr_in = unsafe { mem::zeroed() };
let struct_size = mem::size_of::<libc::sockaddr_in>();
if size > struct_size {
return Err(TraceError::MemoryCapacityError(
"sockaddr_in".to_string(),
size,
struct_size,
));
}
self.ptrace.read_memory_to_destination(
self.pid,
self.value as usize,
&mut sockaddr_in as *mut libc::sockaddr_in,
)?;
Value::SockAddr(call::SockAddr::INET(sockaddr_in))
}
call::AddressFamily::AF_INET6 => {
let mut sockaddr_in6: libc::sockaddr_in6 = unsafe { mem::zeroed() };
let struct_size = mem::size_of::<libc::sockaddr_in6>();
if size > struct_size {
return Err(TraceError::MemoryCapacityError(
"sockaddr_in6".to_string(),
size,
struct_size,
));
}
self.ptrace.read_memory_to_destination(
self.pid,
self.value as usize,
&mut sockaddr_in6 as *mut libc::sockaddr_in6,
)?;
Value::SockAddr(call::SockAddr::INET6(sockaddr_in6))
}
_ => Value::SockAddr(call::SockAddr::__unknown(address_family as usize)),
};
Ok(ret)
})?,
AV::Void(_) => Value::Void,
AV::DynType(d2, converter) => {
skip_if_2(&self.dir, d2, || converter.convert(self.value))
}
};
Ok(out)
}
}