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use crate::{
private_trait::Sealed, proto, util::OutputChain, Done, Errno, Operation, Reply, Request,
};
use super::c_to_os;
use std::ffi::{CStr, OsStr};
pub enum Setxattr {}
pub enum Getxattr {}
pub enum Listxattr {}
pub enum Removexattr {}
pub struct XattrReadState {
size: u32,
}
impl Sealed for Setxattr {}
impl Sealed for Getxattr {}
impl Sealed for Listxattr {}
impl Sealed for Removexattr {}
impl<'o> Operation<'o> for Setxattr {
// header, name, value
type RequestBody = (&'o proto::SetxattrIn, &'o CStr, &'o [u8]);
type ReplyTail = ();
}
impl<'o> Operation<'o> for Getxattr {
type RequestBody = (&'o proto::GetxattrIn, &'o CStr);
type ReplyTail = XattrReadState;
}
impl<'o> Operation<'o> for Listxattr {
type RequestBody = &'o proto::ListxattrIn;
type ReplyTail = XattrReadState;
}
impl<'o> Operation<'o> for Removexattr {
type RequestBody = &'o CStr;
type ReplyTail = ();
}
//TODO: flags
impl<'o> Request<'o, Setxattr> {
pub fn name(&self) -> &OsStr {
let (_header, name, _value) = self.body;
c_to_os(name)
}
pub fn value(&self) -> &[u8] {
let (_header, _name, value) = self.body;
value
}
}
impl<'o> Reply<'o, Setxattr> {
pub fn ok(self) -> Done<'o> {
self.empty()
}
pub fn not_found(self) -> Done<'o> {
self.fail(Errno::ENODATA)
}
}
impl<'o> Request<'o, Getxattr> {
pub fn size(&self) -> u32 {
self.body.0.size
}
pub fn name(&self) -> &OsStr {
c_to_os(self.body.1)
}
}
impl<'o> Reply<'o, Getxattr> {
pub fn slice(self, value: &[u8]) -> Done<'o> {
let size = value.len().try_into().expect("Extremely large xattr");
if self.tail.size == 0 {
return self.value_size(size);
} else if self.tail.size < size {
return self.buffer_too_small();
}
self.chain(OutputChain::tail(&[value]))
}
pub fn value_size(self, size: u32) -> Done<'o> {
assert_eq!(self.tail.size, 0);
self.single(&proto::GetxattrOut {
size,
padding: Default::default(),
})
}
pub fn buffer_too_small(self) -> Done<'o> {
self.fail(Errno::ERANGE)
}
pub fn not_found(self) -> Done<'o> {
self.fail(Errno::ENODATA)
}
}
impl<'o> Request<'o, Listxattr> {
pub fn size(&self) -> u32 {
self.body.getxattr_in.size
}
}
impl<'o> Reply<'o, Listxattr> {
//TODO: buffered(), gather()
pub fn value_size(self, size: u32) -> Done<'o> {
assert_eq!(self.tail.size, 0);
self.single(&proto::ListxattrOut {
getxattr_out: proto::GetxattrOut {
size,
padding: Default::default(),
},
})
}
pub fn buffer_too_small(self) -> Done<'o> {
self.fail(Errno::ERANGE)
}
}
impl<'o> Request<'o, Removexattr> {
pub fn name(&self) -> &OsStr {
c_to_os(self.body)
}
}
impl<'o> Reply<'o, Removexattr> {
pub fn ok(self) -> Done<'o> {
self.empty()
}
}
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