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autodrop: cache the autodrop-command set (config_gen-tagged) instead of re-splitting autodrop_commands on every packet from an unregistered socket — the path runs hottest under the scanner flood it defends against

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This commit is contained in:
Jean Chevronnet 2026-08-19 01:51:57 +00:00
parent 09b4adabbf
commit 1da913a249
1 changed files with 24 additions and 3 deletions
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27
src/modules/autodrop.rs
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@ -7,10 +7,18 @@
//! autodrop_commands = GET POST HEAD CONNECT PUT DELETE OPTIONS TRACE PATCH
//! ```
use crate::map::HashSet;
use crate::module::{ModResult, Module};
use crate::server::Server;
use crate::Uid;
/// The autodrop-command set, parsed once and re-parsed only on rehash.
#[derive(Default)]
struct DropCache {
gen: u64,
cmds: HashSet<String>, // uppercased
}
pub struct AutoDrop;
impl Module for AutoDrop {
@ -29,10 +37,23 @@ impl Module for AutoDrop {
if s.users.get(&uid).map(|u| u.registered).unwrap_or(true) {
return ModResult::Passthru;
}
// cache the set (config_gen-tagged): this hook runs hottest under the exact
// scanner flood it defends against, so don't re-split the config per packet.
let gen = s.config_gen;
let stale = s.ext.get::<DropCache>().map(|c| c.gen != gen).unwrap_or(true);
if stale {
let cmds: HashSet<String> = s
.conf_all("autodrop_commands")
.iter()
.flat_map(|line| line.split_whitespace())
.map(|w| w.to_ascii_uppercase())
.collect();
s.ext.set(DropCache { gen, cmds });
}
let hit = s
.conf_all("autodrop_commands")
.iter()
.any(|line| line.split_whitespace().any(|w| w.eq_ignore_ascii_case(cmd)));
.ext
.get::<DropCache>()
.is_some_and(|c| c.cmds.contains(&cmd.to_ascii_uppercase()));
if hit {
s.send(uid, "ERROR :Closing link (dropped)".to_string());
s.remove_user(uid, "Autodropped");