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fix SETFL #730

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afd282a
fix SETFL
CvvT Mar 15, 2026
007856b
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CvvT Mar 15, 2026
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42 changes: 42 additions & 0 deletions litebox_runner_linux_userland/tests/run.rs
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Original file line number Diff line number Diff line change
Expand Up @@ -590,3 +590,45 @@ fn test_tun_and_runner_with_iperf3() {
has_started.store(true, std::sync::atomic::Ordering::Relaxed);
runner.run();
}

#[cfg(target_arch = "x86_64")]
#[test]
fn test_tun_with_curl() {
use std::io::{Read, Write};
use std::net::TcpListener;

const RESPONSE_BODY: &str = "#!/bin/bash\necho 'Hello from litebox!'\n";

// Bind to an OS-assigned port on all interfaces.
let listener = TcpListener::bind("0.0.0.0:0").expect("Failed to bind HTTP server");
let port = listener.local_addr().unwrap().port();

let server_thread = std::thread::spawn(move || {
let (mut stream, _) = listener.accept().expect("Failed to accept connection");
let mut buf = [0u8; 4096];
let n = stream.read(&mut buf).expect("Failed to read request");
let request = String::from_utf8_lossy(&buf[..n]);
println!("Received HTTP request:\n{request}");

let response = format!(
"HTTP/1.1 200 OK\r\nContent-Length: {}\r\nConnection: close\r\n\r\n{}",
RESPONSE_BODY.len(),
RESPONSE_BODY
);
stream
.write_all(response.as_bytes())
.expect("Failed to send response");
});

let curl_path = run_which("curl");
let url = format!("http://10.0.0.1:{port}/something");
let output = Runner::new(Backend::Rewriter, &curl_path, "curl_rewriter")
.args(["-sS", &url])
.tun_device_name("tun99")
.output();

server_thread.join().expect("Server thread panicked");

let output_str = String::from_utf8_lossy(&output);
assert!(output_str.contains(RESPONSE_BODY), "Unexpected curl output");
}
3 changes: 3 additions & 0 deletions litebox_shim_linux/src/lib.rs
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Original file line number Diff line number Diff line change
Expand Up @@ -341,6 +341,9 @@ fn default_fs(
// Special override so that `GETFL` can return stdio-specific flags
pub(crate) struct StdioStatusFlags(litebox::fs::OFlags);

/// Status flags for pipes
pub(crate) struct PipeStatusFlags(pub litebox::fs::OFlags);

impl<FS: ShimFS> syscalls::file::FilesState<FS> {
fn initialize_stdio_in_shared_descriptors_table(&self, global: &GlobalState<FS>) {
use litebox::fs::{Mode, OFlags};
Expand Down
170 changes: 88 additions & 82 deletions litebox_shim_linux/src/syscalls/file.rs
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Original file line number Diff line number Diff line change
Expand Up @@ -1012,117 +1012,108 @@ impl<FS: ShimFS> Task<FS> {
.ok_or(Errno::EBADF)?
.set_file_descriptor_flags(&self.global, &files, flags)
.map(|()| 0),
FcntlArg::GETFL => match desc {
Descriptor::LiteBoxRawFd(raw_fd) => Ok(files
.run_on_raw_fd(
*raw_fd,
|fd| {
Ok(self
.global
.litebox
.descriptor_table()
.with_metadata(fd, |crate::StdioStatusFlags(flags)| {
*flags & OFlags::STATUS_FLAGS_MASK
})
.unwrap_or(OFlags::empty()))
},
|fd| {
Ok(self
.global
.litebox
.descriptor_table()
.with_metadata(fd, |crate::syscalls::net::SocketOFlags(flags)| {
*flags & OFlags::STATUS_FLAGS_MASK
})
.unwrap_or(OFlags::empty()))
},
|fd| {
let pipes = &self.global.pipes;
let flags = OFlags::from(pipes.get_flags(fd).map_err(Errno::from)?);
let dirn = match pipes.half_pipe_type(fd)? {
litebox::pipes::HalfPipeType::SenderHalf => OFlags::WRONLY,
litebox::pipes::HalfPipeType::ReceiverHalf => OFlags::RDONLY,
};
Ok(dirn | flags)
},
)
.flatten()?
.bits()),
Descriptor::Eventfd { file, .. } => Ok(file.get_status().bits()),
Descriptor::Epoll { file, .. } => Ok(file.get_status().bits()),
Descriptor::Unix { file, .. } => Ok(file.get_status().bits()),
},
FcntlArg::GETFL => {
macro_rules! getfl_from_metadata {
($fd:expr, $MetaType:path) => {
Ok(self
.global
.litebox
.descriptor_table()
.with_metadata($fd, |$MetaType(flags)| {
*flags & OFlags::STATUS_FLAGS_MASK
})
.unwrap_or(OFlags::empty()))
};
}
match desc {
Descriptor::LiteBoxRawFd(raw_fd) => Ok(files
.run_on_raw_fd(
*raw_fd,
|fd| getfl_from_metadata!(fd, crate::StdioStatusFlags),
|fd| getfl_from_metadata!(fd, crate::syscalls::net::SocketOFlags),
|fd| getfl_from_metadata!(fd, crate::PipeStatusFlags),
)
.flatten()?
.bits()),
Descriptor::Eventfd { file, .. } => Ok(file.get_status().bits()),
Descriptor::Epoll { file, .. } => Ok(file.get_status().bits()),
Descriptor::Unix { file, .. } => Ok(file.get_status().bits()),
}
}
FcntlArg::SETFL(flags) => {
let setfl_mask = OFlags::APPEND
| OFlags::NONBLOCK
| OFlags::NDELAY
| OFlags::DIRECT
| OFlags::NOATIME;
let flags = flags & setfl_mask;
macro_rules! toggle_flags {
($t:ident) => {
let diff = $t.get_status() ^ flags;
let diff = ($t.get_status() & setfl_mask) ^ flags;
if diff.intersects(OFlags::APPEND | OFlags::DIRECT | OFlags::NOATIME) {
todo!("unsupported flags");
log_unsupported!("unsupported flags");
}
$t.set_status(flags & setfl_mask, true);
$t.set_status(flags.complement() & setfl_mask, false);
};
}
macro_rules! setfl_in_metadata {
($fd:expr, $MetaType:path, $no_metadata_msg:expr) => {
setfl_in_metadata!($fd, $MetaType, $no_metadata_msg, |diff: OFlags| {
if diff.intersects(OFlags::APPEND | OFlags::DIRECT | OFlags::NOATIME) {
log_unsupported!("unsupported flags");
}
})
};
($fd:expr, $MetaType:path, $no_metadata_msg:expr, $check_diff:expr) => {
self.global
.litebox
.descriptor_table_mut()
.with_metadata_mut($fd, |$MetaType(f)| {
let diff = (*f & setfl_mask) ^ flags;
$check_diff(diff);
f.toggle(diff);
})
.map_err(|err| match err {
MetadataError::ClosedFd => Errno::EBADF,
MetadataError::NoSuchMetadata => $no_metadata_msg,
})
};
}
match desc {
Descriptor::LiteBoxRawFd(raw_fd) => files.run_on_raw_fd(
*raw_fd,
|fd| {
self.global
.litebox
.descriptor_table_mut()
.with_metadata_mut(fd, |crate::StdioStatusFlags(f)| {
let diff = *f ^ flags;
if diff.intersects(
OFlags::APPEND | OFlags::DIRECT | OFlags::NOATIME,
) {
todo!("unsupported flags");
}
f.toggle(diff);
})
.map_err(|err| match err {
MetadataError::ClosedFd => Errno::EBADF,
MetadataError::NoSuchMetadata => {
unimplemented!("SETFL on non-stdio")
}
})
setfl_in_metadata!(
fd,
crate::StdioStatusFlags,
unimplemented!("SETFL on non-stdio")
)
},
|fd| {
self.global
.litebox
.descriptor_table_mut()
.with_metadata_mut(fd, |crate::syscalls::net::SocketOFlags(f)| {
let diff = *f ^ flags;
if diff.intersects(
OFlags::APPEND | OFlags::DIRECT | OFlags::NOATIME,
) {
todo!("unsupported flags");
}
f.toggle(diff);
})
.map_err(|err| match err {
MetadataError::ClosedFd => Errno::EBADF,
MetadataError::NoSuchMetadata => {
unreachable!("all sockets have SocketOFlags when created")
}
})
setfl_in_metadata!(
fd,
crate::syscalls::net::SocketOFlags,
unreachable!("all sockets have SocketOFlags when created")
)
},
|fd| {
if flags.intersects(OFlags::NONBLOCK.complement()) {
todo!("unsupported flags for pipes")
}
// Update the actual pipe non-blocking behavior
self.global
.pipes
.update_flags(
fd,
litebox::pipes::Flags::NON_BLOCKING,
flags.intersects(OFlags::NONBLOCK),
)
.map_err(Errno::from)
.map_err(Errno::from)?;
// Record all status flags in metadata for F_GETFL
setfl_in_metadata!(
fd,
crate::PipeStatusFlags,
unreachable!("all pipes have PipeStatusFlags when created"),
|_| {}
)
},
)??,
Descriptor::Eventfd { file, .. } => {
Expand Down Expand Up @@ -1291,6 +1282,21 @@ impl<FS: ShimFS> Task<FS> {
core::num::NonZero::new(4096),
);

{
let initial_status = OFlags::from(pipe_flags);
let mut dt = self.global.litebox.descriptor_table_mut();
let old = dt.set_entry_metadata(
&writer,
crate::PipeStatusFlags(initial_status | OFlags::WRONLY),
);
assert!(old.is_none());
let old = dt.set_entry_metadata(
&reader,
crate::PipeStatusFlags(initial_status | OFlags::RDONLY),
);
assert!(old.is_none());
}

if cloexec {
let mut dt = self.global.litebox.descriptor_table_mut();
let None = dt.set_fd_metadata(&writer, FileDescriptorFlags::FD_CLOEXEC) else {
Expand Down
4 changes: 2 additions & 2 deletions litebox_shim_linux/src/syscalls/tests.rs
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Original file line number Diff line number Diff line change
Expand Up @@ -71,8 +71,8 @@ fn test_fcntl() {
.unwrap();
assert_eq!(task.sys_fcntl(fd, FcntlArg::GETFD).unwrap(), 0);

task.sys_fcntl(fd, FcntlArg::SETFL(OFlags::empty()))
.unwrap();
// OFlags::RDWR should be ignored
task.sys_fcntl(fd, FcntlArg::SETFL(OFlags::RDWR)).unwrap();
assert_eq!(task.sys_fcntl(fd, FcntlArg::GETFL).unwrap(), flags2.bits());
};

Expand Down
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