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use super::{
c_to_os,
traits::{ReplyGather, ReplyNotFound, ReplyOk, RequestData, RequestName, RequestSize},
};
use crate::{proto, sealed::Sealed, util::OutputChain, Done, Errno, Operation, Reply, Request};
use std::ffi::{CStr, OsStr};
pub enum Setxattr {}
pub enum Getxattr {}
pub enum Listxattr {}
pub enum Removexattr {}
pub struct XattrReadState {
size: u32,
}
pub trait ReplyXattrRead<'o>: Operation<'o> {
fn requires_size(reply: Reply<'o, Self>, size: u32) -> Done<'o>;
fn buffer_too_small(reply: Reply<'o, Self>) -> Done<'o> {
reply.fail(Errno::ERANGE)
}
}
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 ReplyState = ();
}
impl<'o> Operation<'o> for Getxattr {
type RequestBody = (&'o proto::GetxattrIn, &'o CStr);
type ReplyState = XattrReadState;
}
impl<'o> Operation<'o> for Listxattr {
type RequestBody = &'o proto::ListxattrIn;
type ReplyState = XattrReadState;
}
impl<'o> Operation<'o> for Removexattr {
type RequestBody = &'o CStr;
type ReplyState = ();
}
impl<'o> RequestName<'o> for Setxattr {
fn name<'a>(request: &'a Request<'o, Self>) -> &'a OsStr {
let (_header, name, _value) = request.body;
c_to_os(name)
}
}
//TODO: flags
impl<'o> RequestData<'o> for Setxattr {
fn data<'a>(request: &'a Request<'o, Self>) -> &'a [u8] {
let (_header, _name, value) = request.body;
value
}
}
impl<'o> ReplyOk<'o> for Setxattr {}
impl<'o> ReplyNotFound<'o> for Setxattr {
fn not_found(reply: Reply<'o, Self>) -> Done<'o> {
reply.fail(Errno::ENODATA)
}
}
impl<'o> RequestSize<'o> for Getxattr {
fn size(request: &Request<'o, Self>) -> u32 {
request.body.0.size
}
}
impl<'o> RequestName<'o> for Getxattr {
fn name<'a>(request: &'a Request<'o, Self>) -> &'a OsStr {
c_to_os(request.body.1)
}
}
impl<'o> ReplyNotFound<'o> for Getxattr {
fn not_found(reply: Reply<'o, Self>) -> Done<'o> {
reply.fail(Errno::ENODATA)
}
}
impl<'o> ReplyGather<'o> for Getxattr {
fn gather(reply: Reply<'o, Self>, fragments: &[&[u8]]) -> Done<'o> {
let size = fragments
.iter()
.map(|fragment| fragment.len())
.sum::<usize>()
.try_into()
.expect("Extremely large xattr");
if reply.state.size == 0 {
return reply.requires_size(size);
} else if reply.state.size < size {
return reply.buffer_too_small();
}
reply.chain(OutputChain::tail(fragments))
}
}
impl<'o> ReplyXattrRead<'o> for Getxattr {
fn requires_size(reply: Reply<'o, Self>, size: u32) -> Done<'o> {
assert_eq!(reply.state.size, 0);
reply.single(&proto::GetxattrOut {
size,
padding: Default::default(),
})
}
}
impl<'o> RequestSize<'o> for Listxattr {
fn size(request: &Request<'o, Self>) -> u32 {
request.body.getxattr_in.size
}
}
impl<'o> ReplyXattrRead<'o> for Listxattr {
//TODO: buffered(), gather()
fn requires_size(reply: Reply<'o, Self>, size: u32) -> Done<'o> {
assert_eq!(reply.state.size, 0);
reply.single(&proto::ListxattrOut {
getxattr_out: proto::GetxattrOut {
size,
padding: Default::default(),
},
})
}
}
impl<'o> RequestName<'o> for Removexattr {
fn name<'a>(request: &'a Request<'o, Self>) -> &'a OsStr {
c_to_os(request.body)
}
}
impl<'o> ReplyOk<'o> for Removexattr {}
impl<'o> ReplyNotFound<'o> for Removexattr {
fn not_found(reply: Reply<'o, Self>) -> Done<'o> {
reply.fail(Errno::ENODATA)
}
}
|
