Switch to varlink as IPC protocol

This is a lot! Whole new design on top of a statefult varlink interface.

You can now handle multiple request response cycles over a single
connection.

The error responses are lot more refined than just status codes with
optional messages and finally part of the protocol.

TODO: A lot of error handling needs to be improved.

1 files changed, 35 insertions, 0 deletions

diff --git a/src/cmd/init.rs b/src/cmd/init.rs
new file mode 100644
index 0000000..167d028
--- /dev/null
+++ b/src/cmd/init.rs
@@ -0,0 +1,35 @@
+use std::ffi::CString;
+
+use crate::cmd::MailStorage;
+use crate::de_jmhoffmann_jwebmail_mailstorage::Call_Init;
+
+pub fn init(
+    ms: &MailStorage,
+    call: &mut dyn Call_Init,
+    unix_user: String,
+    mailbox_path: String,
+) -> varlink::Result<()> {
+    unsafe {
+        *libc::__errno_location() = 0;
+    }
+    if let Ok(c_sys_user) = CString::new(unix_user.clone()) {
+        let user_info: *const libc::passwd = unsafe { libc::getpwnam(c_sys_user.as_ptr()) };
+        let err = unsafe { *libc::__errno_location() };
+        if err != 0 {
+            return call.reply_invalid_user(unix_user);
+        }
+        if user_info.is_null() {
+            return call.reply_invalid_user(unix_user);
+        }
+        let rc = unsafe { libc::setuid((*user_info).pw_uid) };
+        if rc != 0 {
+            return call.reply_invalid_user(unix_user);
+        }
+
+        *ms.maildir_path.write().unwrap() = Some(mailbox_path.into());
+
+        call.reply()
+    } else {
+        call.reply_invalid_user(unix_user)
+    }
+}