add helper valid_smtp_response() to be used in upcoming commits

1 files changed, 16 insertions, 1 deletions

diff --git a/usr.sbin/smtpd/util.c b/usr.sbin/smtpd/util.c
index 3637d4dfff7..df7fabad782 100644
--- a/usr.sbin/smtpd/util.c
+++ b/usr.sbin/smtpd/util.c
@@ -1,4 +1,4 @@
-/*	$OpenBSD: util.c,v 1.137 2018/09/02 21:06:44 gilles Exp $	*/
+/*	$OpenBSD: util.c,v 1.138 2018/10/31 16:32:12 gilles Exp $	*/
 
 /*
  * Copyright (c) 2000,2001 Markus Friedl.  All rights reserved.
@@ -541,6 +541,21 @@ valid_domainpart(const char *s)
 }
 
 int
+valid_smtp_response(const char *s)
+{
+	if (strlen(s) < 5)
+		return 0;
+
+	if ((s[0] < '2' || s[0] > '5') ||
+	    (s[1] < '0' || s[1] > '9') ||
+	    (s[2] < '0' || s[2] > '9') ||
+	    (s[3] != ' '))
+		return 0;
+
+	return 1;
+}
+
+int
 secure_file(int fd, char *path, char *userdir, uid_t uid, int mayread)
 {
 	char		 buf[PATH_MAX];