Only kill unknown prefix UIDs that start with a valid SID

(existing and behind the link that sent the prefix).
Also require them to be exactly 9 characters long.

diff --git a/src/parse.c b/src/parse.c
index 37d0c88f0fd93145bffbb8e885b2062188aa7aec..138f10240345912f5e910c2ca67e95bdef310d25 100644 (file)
--- a/src/parse.c
+++ b/src/parse.c
@@ -532,6 +532,8 @@ static void
 remove_unknown(struct Client *client_p, char *lsender, char *lbuffer)
 {
        int slen = strlen(lsender);
+       char sid[4];
+       struct Client *server;
 
        /* meepfoo      is a nickname (ignore)
         * #XXXXXXXX    is a UID (KILL)
@@ -550,9 +552,21 @@ remove_unknown(struct Client *client_p, char *lsender, char *lbuffer)
                           get_id(&me, client_p), lsender, 
                           lbuffer, client_p->name);
        }
-       else if(IsDigit(lsender[0]))
-               sendto_one(client_p, ":%s KILL %s :%s (Unknown Client)", 
-                          get_id(&me, client_p), lsender, me.name);
+       else if(!IsDigit(lsender[0]))
+               ;
+       else if(slen != 9)
+               sendto_realops_snomask(SNO_DEBUG, L_ALL,
+                                    "Invalid prefix (%s) from %s",
+                                    lbuffer, client_p->name);
+       else
+       {
+               memcpy(sid, lsender, 3);
+               sid[3] = '\0';
+               server = find_server(NULL, sid);
+               if (server != NULL && server->from == client_p)
+                       sendto_one(client_p, ":%s KILL %s :%s (Unknown Client)", 
+                                       get_id(&me, client_p), lsender, me.name);
+       }
 }