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From: Stefan Hanreich <s.hanreich@proxmox.com>
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Date: Tue, 1 Apr 2025 15:21:04 +0200
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Subject: [pve-devel] [PATCH proxmox 2/2] network-types: add hostname type
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Add a type for representing Linux hostnames. These are the same
constraints as the installer enforces [1]. Lowercasing is fine as
well, since practically everything treats hostnames case-insensitively
as RFC 952 stipulates:
> No distinction is made between upper and lower case.
[1] https://git.proxmox.com/?p=pve-installer.git;a=blob;f=Proxmox/Sys/Net.pm;h=81cb15f0042b195461324fffeca53d732133629e;hb=HEAD#l11
[2] https://www.rfc-editor.org/rfc/rfc952.txt
Signed-off-by: Stefan Hanreich <s.hanreich@proxmox.com>
---
Notes:
sending this separately because this contains the new types, that
haven't been a part of proxmox-ve-rs before.
proxmox-network-types/src/hostname.rs | 75 +++++++++++++++++++++++++++
proxmox-network-types/src/lib.rs | 1 +
2 files changed, 76 insertions(+)
create mode 100644 proxmox-network-types/src/hostname.rs
diff --git a/proxmox-network-types/src/hostname.rs b/proxmox-network-types/src/hostname.rs
new file mode 100644
index 00000000..f183aecb
--- /dev/null
+++ b/proxmox-network-types/src/hostname.rs
@@ -0,0 +1,75 @@
+use std::fmt::Display;
+
+use serde::{Deserialize, Serialize};
+use thiserror::Error;
+
+#[derive(Error, Debug)]
+pub enum HostnameError {
+ #[error("the hostname must be from 1 to 63 characters long")]
+ InvalidLength,
+ #[error("the hostname contains invalid symbols")]
+ InvalidSymbols,
+}
+
+/// Hostname of a Linux machine
+///
+/// A hostname is at most 63 characters long and must only contain lowercase alphanumeric
+/// characters as well as hyphens. It must not start or end with a hyphen.
+#[derive(Debug, Deserialize, Serialize, Clone, Eq, Hash, PartialOrd, Ord, PartialEq)]
+pub struct Hostname(String);
+
+impl std::str::FromStr for Hostname {
+ type Err = HostnameError;
+
+ fn from_str(hostname: &str) -> Result<Self, Self::Err> {
+ Self::new(hostname)
+ }
+}
+
+impl AsRef<str> for Hostname {
+ fn as_ref(&self) -> &str {
+ &self.0
+ }
+}
+
+impl Display for Hostname {
+ fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {
+ self.0.fmt(f)
+ }
+}
+
+impl Hostname {
+ /// Constructs a new hostname from a string
+ ///
+ /// This function accepts characters in any case, but the resulting hostname will be
+ /// lowercased.
+ pub fn new(name: impl AsRef<str>) -> Result<Self, HostnameError> {
+ let name_ref = name.as_ref();
+
+ if !(1..63).contains(&name_ref.len()) {
+ return Err(HostnameError::InvalidLength);
+ }
+
+ let host_name = name_ref.to_lowercase();
+
+ let mut characters = host_name.chars();
+
+ // first character must not be a hyphen
+ // SAFETY: ok because of length check
+ if !characters.next().unwrap().is_alphanumeric() {
+ return Err(HostnameError::InvalidSymbols);
+ }
+
+ if !characters.all(|c| c.is_alphanumeric() || c == '-') {
+ return Err(HostnameError::InvalidSymbols);
+ }
+
+ // last character must not be a hyphen
+ // SAFETY: ok because of length check
+ if !host_name.chars().next_back().unwrap().is_alphanumeric() {
+ return Err(HostnameError::InvalidSymbols);
+ }
+
+ Ok(Self(host_name))
+ }
+}
diff --git a/proxmox-network-types/src/lib.rs b/proxmox-network-types/src/lib.rs
index b952d71c..f4812146 100644
--- a/proxmox-network-types/src/lib.rs
+++ b/proxmox-network-types/src/lib.rs
@@ -1,2 +1,3 @@
+pub mod hostname;
pub mod ip_address;
pub mod mac_address;
--
2.39.5
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