whois: track remote users' umodes from UID; show 335 (is a bot) for remote +B services/bots and 379 modes to opers

src/coremods/core_info.rs

@@ -135,6 +135,18 @@ impl Command for Whois {
                             &format!("{} {a} :is logged in as", ru.nick),
                         );
                     }
+                    // 335: mark remote bots (+B), e.g. services / BotServ bots
+                    if ru.modes.contains('B') {
+                        s.numeric(uid, RPL_WHOISBOT, &format!("{} :is a bot", ru.nick));
+                    }
+                    // 379: a remote user's modes — opers only (self is impossible here)
+                    if s.is_oper(uid) && !ru.modes.is_empty() {
+                        s.numeric(
+                            uid,
+                            RPL_WHOISMODES,
+                            &format!("{} :is using modes +{}", ru.nick, ru.modes),
+                        );
+                    }
                     s.numeric(
                         uid,
                         RPL_ENDOFWHOIS,

src/link.rs

@@ -56,6 +56,7 @@ pub struct RemoteUser {
     pub realname: String,
     pub account: Option<String>,
     pub ip: String,    // client IP (for network-wide clone limits); "" if a peer omitted it
+    pub modes: String, // user mode letters (no leading '+'); e.g. services wear "iHB"
     pub sid: String,   // origin server id
     pub via: Uid,      // local link uid it is reached through
 }
@@ -866,6 +867,11 @@ impl Server {
         let host = msg.params[4].clone(); // displayed host
         let ident = msg.params[6].clone(); // displayed ident
         let ip = msg.params[7].clone();
+        let modes = msg
+            .params
+            .get(9)
+            .map(|m| m.trim_start_matches('+').to_string())
+            .unwrap_or_default();
         let realname = msg.params.last().cloned().unwrap_or_default();
         // nick collision: a local holder is killed (both sides do this, so both
         // vanish deterministically); an existing remote holder simply wins.
@@ -889,6 +895,7 @@ impl Server {
                 realname,
                 account: None,
                 ip,
+                modes,
                 sid,
                 via,
             },