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Reduce the scope of unsafe blocks in FFI

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Spawn tasks from safe functions to ensure there is no use-after-free.
This commit is contained in:
link2xt
2023-03-13 15:56:00 +00:00
parent 8936e9a416
commit 8d80aea5c8
1 changed files with 23 additions and 19 deletions
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42
deltachat-ffi/src/lib.rs
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@@ -421,6 +421,10 @@ pub unsafe extern "C" fn dc_get_oauth2_url(
})
}
fn spawn_configure(ctx: Context) {
spawn(async move { ctx.configure().await.log_err(&ctx, "Configure failed") });
}
#[no_mangle]
pub unsafe extern "C" fn dc_configure(context: *mut dc_context_t) {
if context.is_null() {
@@ -428,10 +432,8 @@ pub unsafe extern "C" fn dc_configure(context: *mut dc_context_t) {
return;
}
// Clone the context Arc so we do not use the reference after dc_configure() returns.
let ctx = (*context).clone();
spawn(async move { ctx.configure().await.log_err(&ctx, "Configure failed") });
let ctx = &*context;
spawn_configure(ctx.clone());
}
#[no_mangle]
@@ -2177,6 +2179,14 @@ pub unsafe extern "C" fn dc_get_contact(
})
}
fn spawn_imex(ctx: Context, what: imex::ImexMode, param1: String, passphrase: Option<String>) {
spawn(async move {
imex::imex(&ctx, what, param1.as_ref(), passphrase)
.await
.log_err(&ctx, "IMEX failed")
});
}
#[no_mangle]
pub unsafe extern "C" fn dc_imex(
context: *mut dc_context_t,
@@ -2197,15 +2207,10 @@ pub unsafe extern "C" fn dc_imex(
};
let passphrase = to_opt_string_lossy(param2);
// Clone the context Arc so we do not use the reference after dc_imex() returns.
let ctx = (*context).clone();
let ctx = &*context;
if let Some(param1) = to_opt_string_lossy(param1) {
spawn(async move {
imex::imex(&ctx, what, param1.as_ref(), passphrase)
.await
.log_err(&ctx, "IMEX failed")
});
spawn_imex(ctx.clone(), what, param1, passphrase);
} else {
eprintln!("dc_imex called without a valid directory");
}
@@ -4643,6 +4648,12 @@ mod jsonrpc {
drop(Box::from_raw(jsonrpc_instance));
}
fn spawn_handle_jsonrpc_request(handle: RpcSession<CommandApi>, request: String) {
spawn(async move {
handle.handle_incoming(&request).await;
});
}
#[no_mangle]
pub unsafe extern "C" fn dc_jsonrpc_request(
jsonrpc_instance: *mut dc_jsonrpc_instance_t,
@@ -4654,15 +4665,8 @@ mod jsonrpc {
}
let handle = &(*jsonrpc_instance).handle;
// Clone the handle so we do not use the reference
// in spawned task after return from dc_jsonrpc_request().
let handle = handle.clone();
let request = to_string_lossy(request);
spawn(async move {
handle.handle_incoming(&request).await;
});
spawn_handle_jsonrpc_request(handle.clone(), request);
}
#[no_mangle]