Add sanity checking of incoming nicknames.

Check that at least the first character of an incoming nickname is valid (we
actually go a bit beyond the RFC by also allowing any char with bit 8 set - at
least Russian servers use nicknames like this).


git-svn-id: svn://svn.code.sf.net/p/bitchx/code/trunk@501 13b04d17-f746-0410-82c6-800466cd88b0

source/parse.c

@@ -1950,6 +1950,17 @@ void parse_server(char *orig_line)
 	/* XXXX - i dont think 'from' can be null here.  */
 	if (!(comm = (*ArgList++)) || !from || !*ArgList)
 		return;		/* Serious protocol violation -- ByeBye  */
+
+	/* Check for egregiously bad nicknames */
+#define islegal(c) (((c) >= 'A' && (c) <= '}') || \
+	((c) >= '0' && (c) <= '9') || (c) == '-' || (c & 0x80))
+
+	if (*from && !strchr(from, '.') && !islegal(*from))
+	{
+		rfc1459_odd(from, comm, ArgList);
+		return;
+	}
+
 #ifdef WANT_TCL
 	if (check_tcl_raw(copy, comm))
 		return;