util: add comment explaining hostname_is_valid()

diff --git a/src/shared/util.c b/src/shared/util.c
index 891182a35b70d4460aa2082914753090305f6621..11cab6dcf1710f590b2a879f019f274ead1e6020 100644 (file)
--- a/src/shared/util.c
+++ b/src/shared/util.c
@@ -4248,6 +4248,11 @@ bool hostname_is_valid(const char *s) {
         if (isempty(s))
                 return false;
 
         if (isempty(s))
                 return false;
 

+        /* Doesn't accept empty hostnames, hostnames with trailing or
+         * leading dots, and hostnames with multiple dots in a
+         * sequence. Also ensures that the length stays below
+         * HOST_NAME_MAX. */
+

         for (p = s, dot = true; *p; p++) {
                 if (*p == '.') {
                         if (dot)
         for (p = s, dot = true; *p; p++) {
                 if (*p == '.') {
                         if (dot)