Implementing main functions of init, check TODO.md

1 files changed, 37 insertions, 0 deletions

diff --git a/init/src/host/sethn.rs b/init/src/host/sethn.rs
new file mode 100644
index 0000000..1857297
--- /dev/null
+++ b/init/src/host/sethn.rs
@@ -0,0 +1,37 @@
+use std::{ffi::CString, fs, io};
+use libc::{sethostname, c_char, size_t};
+use crate::log::{log_warning};
+
+pub fn try_set_hostname() {
+    let content = fs::read_to_string("/etc/hostname")
+        .map(|s| s.trim().to_string()) 
+        .unwrap_or_else(|_| "localhost".to_string());
+
+    if let Err(e) = perform_set_hostname(&content) {
+        log_warning(&format!("Failed to set hostname to '{}': {}. Falling back to localhost.", content, e));
+        let _ = perform_set_hostname("localhost");
+    }
+}
+
+fn perform_set_hostname(name: &str) -> io::Result<()> {
+    if name.len() > 64 {
+        return Err(io::Error::new(io::ErrorKind::InvalidInput, "Hostname too long"));
+    }
+
+    let c_str = CString::new(name).map_err(|_| {
+        io::Error::new(io::ErrorKind::InvalidInput, "Hostname contains null byte")
+    })?;
+
+    let res = unsafe {
+        sethostname(
+            c_str.as_ptr() as *const c_char,
+            name.len() as size_t,
+        )
+    };
+
+    if res != 0 {
+        return Err(io::Error::last_os_error());
+    }
+
+    Ok(())
+}
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