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//! For detailed description of the ptrace requests, consult `man ptrace`.
use std::{mem, ptr};
use {Errno, Error, Result};
use libc::{self, c_void, c_long, siginfo_t};
use ::unistd::Pid;
use sys::signal::Signal;
pub mod ptrace {
use libc::c_int;
cfg_if! {
if #[cfg(any(all(target_os = "linux", arch = "s390x"),
all(target_os = "linux", target_env = "gnu")))] {
pub type PtraceRequest = ::libc::c_uint;
} else {
pub type PtraceRequest = c_int;
}
}
pub const PTRACE_TRACEME: PtraceRequest = 0;
pub const PTRACE_PEEKTEXT: PtraceRequest = 1;
pub const PTRACE_PEEKDATA: PtraceRequest = 2;
pub const PTRACE_PEEKUSER: PtraceRequest = 3;
pub const PTRACE_POKETEXT: PtraceRequest = 4;
pub const PTRACE_POKEDATA: PtraceRequest = 5;
pub const PTRACE_POKEUSER: PtraceRequest = 6;
pub const PTRACE_CONT: PtraceRequest = 7;
pub const PTRACE_KILL: PtraceRequest = 8;
pub const PTRACE_SINGLESTEP: PtraceRequest = 9;
pub const PTRACE_GETREGS: PtraceRequest = 12;
pub const PTRACE_SETREGS: PtraceRequest = 13;
pub const PTRACE_GETFPREGS: PtraceRequest = 14;
pub const PTRACE_SETFPREGS: PtraceRequest = 15;
pub const PTRACE_ATTACH: PtraceRequest = 16;
pub const PTRACE_DETACH: PtraceRequest = 17;
pub const PTRACE_GETFPXREGS: PtraceRequest = 18;
pub const PTRACE_SETFPXREGS: PtraceRequest = 19;
pub const PTRACE_SYSCALL: PtraceRequest = 24;
pub const PTRACE_SETOPTIONS: PtraceRequest = 0x4200;
pub const PTRACE_GETEVENTMSG: PtraceRequest = 0x4201;
pub const PTRACE_GETSIGINFO: PtraceRequest = 0x4202;
pub const PTRACE_SETSIGINFO: PtraceRequest = 0x4203;
pub const PTRACE_GETREGSET: PtraceRequest = 0x4204;
pub const PTRACE_SETREGSET: PtraceRequest = 0x4205;
pub const PTRACE_SEIZE: PtraceRequest = 0x4206;
pub const PTRACE_INTERRUPT: PtraceRequest = 0x4207;
pub const PTRACE_LISTEN: PtraceRequest = 0x4208;
pub const PTRACE_PEEKSIGINFO: PtraceRequest = 0x4209;
pub type PtraceEvent = c_int;
pub const PTRACE_EVENT_FORK: PtraceEvent = 1;
pub const PTRACE_EVENT_VFORK: PtraceEvent = 2;
pub const PTRACE_EVENT_CLONE: PtraceEvent = 3;
pub const PTRACE_EVENT_EXEC: PtraceEvent = 4;
pub const PTRACE_EVENT_VFORK_DONE: PtraceEvent = 5;
pub const PTRACE_EVENT_EXIT: PtraceEvent = 6;
pub const PTRACE_EVENT_SECCOMP: PtraceEvent = 6;
pub const PTRACE_EVENT_STOP: PtraceEvent = 128;
pub type PtraceOptions = c_int;
pub const PTRACE_O_TRACESYSGOOD: PtraceOptions = 1;
pub const PTRACE_O_TRACEFORK: PtraceOptions = (1 << PTRACE_EVENT_FORK);
pub const PTRACE_O_TRACEVFORK: PtraceOptions = (1 << PTRACE_EVENT_VFORK);
pub const PTRACE_O_TRACECLONE: PtraceOptions = (1 << PTRACE_EVENT_CLONE);
pub const PTRACE_O_TRACEEXEC: PtraceOptions = (1 << PTRACE_EVENT_EXEC);
pub const PTRACE_O_TRACEVFORKDONE: PtraceOptions = (1 << PTRACE_EVENT_VFORK_DONE);
pub const PTRACE_O_TRACEEXIT: PtraceOptions = (1 << PTRACE_EVENT_EXIT);
pub const PTRACE_O_TRACESECCOMP: PtraceOptions = (1 << PTRACE_EVENT_SECCOMP);
}
/// Performs a ptrace request. If the request in question is provided by a specialised function
/// this function will return an unsupported operation error.
#[deprecated(
since="0.10.0",
note="usages of `ptrace()` should be replaced with the specialized helper functions instead"
)]
pub unsafe fn ptrace(request: ptrace::PtraceRequest, pid: Pid, addr: *mut c_void, data: *mut c_void) -> Result<c_long> {
use self::ptrace::*;
match request {
PTRACE_PEEKTEXT | PTRACE_PEEKDATA | PTRACE_PEEKUSER => ptrace_peek(request, pid, addr, data),
PTRACE_GETSIGINFO | PTRACE_GETEVENTMSG | PTRACE_SETSIGINFO | PTRACE_SETOPTIONS => Err(Error::UnsupportedOperation),
_ => ptrace_other(request, pid, addr, data)
}
}
fn ptrace_peek(request: ptrace::PtraceRequest, pid: Pid, addr: *mut c_void, data: *mut c_void) -> Result<c_long> {
let ret = unsafe {
Errno::clear();
libc::ptrace(request, libc::pid_t::from(pid), addr, data)
};
match Errno::result(ret) {
Ok(..) | Err(Error::Sys(Errno::UnknownErrno)) => Ok(ret),
err @ Err(..) => err,
}
}
/// Function for ptrace requests that return values from the data field.
/// Some ptrace get requests populate structs or larger elements than c_long
/// and therefore use the data field to return values. This function handles these
/// requests.
fn ptrace_get_data<T>(request: ptrace::PtraceRequest, pid: Pid) -> Result<T> {
// Creates an uninitialized pointer to store result in
let data: T = unsafe { mem::uninitialized() };
let res = unsafe { libc::ptrace(request, libc::pid_t::from(pid), ptr::null_mut::<T>(), &data as *const _ as *const c_void) };
Errno::result(res)?;
Ok(data)
}
unsafe fn ptrace_other(request: ptrace::PtraceRequest, pid: Pid, addr: *mut c_void, data: *mut c_void) -> Result<c_long> {
Errno::result(libc::ptrace(request, libc::pid_t::from(pid), addr, data)).map(|_| 0)
}
/// Set options, as with `ptrace(PTRACE_SETOPTIONS,...)`.
pub fn setoptions(pid: Pid, options: ptrace::PtraceOptions) -> Result<()> {
use self::ptrace::*;
use std::ptr;
let res = unsafe { libc::ptrace(PTRACE_SETOPTIONS, libc::pid_t::from(pid), ptr::null_mut::<libc::c_void>(), options as *mut c_void) };
Errno::result(res).map(|_| ())
}
/// Gets a ptrace event as described by `ptrace(PTRACE_GETEVENTMSG,...)`
pub fn getevent(pid: Pid) -> Result<c_long> {
use self::ptrace::*;
ptrace_get_data::<c_long>(PTRACE_GETEVENTMSG, pid)
}
/// Get siginfo as with `ptrace(PTRACE_GETSIGINFO,...)`
pub fn getsiginfo(pid: Pid) -> Result<siginfo_t> {
use self::ptrace::*;
ptrace_get_data::<siginfo_t>(PTRACE_GETSIGINFO, pid)
}
/// Set siginfo as with `ptrace(PTRACE_SETSIGINFO,...)`
pub fn setsiginfo(pid: Pid, sig: &siginfo_t) -> Result<()> {
use self::ptrace::*;
let ret = unsafe{
Errno::clear();
libc::ptrace(PTRACE_SETSIGINFO, libc::pid_t::from(pid), ptr::null_mut::<libc::c_void>(), sig as *const _ as *const c_void)
};
match Errno::result(ret) {
Ok(_) => Ok(()),
Err(e) => Err(e),
}
}
/// Sets the process as traceable, as with `ptrace(PTRACE_TRACEME, ...)`
///
/// Indicates that this process is to be traced by its parent.
/// This is the only ptrace request to be issued by the tracee.
pub fn traceme() -> Result<()> {
unsafe {
ptrace_other(
ptrace::PTRACE_TRACEME,
Pid::from_raw(0),
ptr::null_mut(),
ptr::null_mut(),
).map(|_| ()) // ignore the useless return value
}
}
/// Ask for next syscall, as with `ptrace(PTRACE_SYSCALL, ...)`
///
/// Arranges for the tracee to be stopped at the next entry to or exit from a system call.
pub fn syscall(pid: Pid) -> Result<()> {
unsafe {
ptrace_other(
ptrace::PTRACE_SYSCALL,
pid,
ptr::null_mut(),
ptr::null_mut(),
).map(|_| ()) // ignore the useless return value
}
}
/// Attach to a running process, as with `ptrace(PTRACE_ATTACH, ...)`
///
/// Attaches to the process specified in pid, making it a tracee of the calling process.
pub fn attach(pid: Pid) -> Result<()> {
unsafe {
ptrace_other(
ptrace::PTRACE_ATTACH,
pid,
ptr::null_mut(),
ptr::null_mut(),
).map(|_| ()) // ignore the useless return value
}
}
/// Restart the stopped tracee process, as with `ptrace(PTRACE_CONT, ...)`
///
/// Continues the execution of the process with PID `pid`, optionally
/// delivering a signal specified by `sig`.
pub fn cont<T: Into<Option<Signal>>>(pid: Pid, sig: T) -> Result<()> {
let data = match sig.into() {
Some(s) => s as i32 as *mut c_void,
None => ptr::null_mut(),
};
unsafe {
ptrace_other(ptrace::PTRACE_CONT, pid, ptr::null_mut(), data).map(|_| ()) // ignore the useless return value
}
}
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