2 files changed, 29 insertions, 0 deletions
diff --git a/src/basic/hostname-util.c b/src/basic/hostname-util.c
index 57031b645c..f900c509a3 100644
--- a/src/basic/hostname-util.c
+++ b/src/basic/hostname-util.c
@@ -48,6 +48,9 @@ bool hostname_is_set(void) {
 char* gethostname_malloc(void) {
         struct utsname u;
 
+        /* This call tries to return something useful, either the actual hostname or it makes something up. The only
+         * reason it might mail is OOM. It might even return "localhost" if that's set. */
+
         assert_se(uname(&u) >= 0);
 
         if (isempty(u.nodename) || streq(u.nodename, "(none)"))
@@ -56,6 +59,31 @@ char* gethostname_malloc(void) {
         return strdup(u.nodename);
 }
 
+int gethostname_strict(char **ret) {
+        struct utsname u;
+        char *k;
+
+        /* This call will rather fail than make up a name. It will not return "localhost" either. */
+
+        assert_se(uname(&u) >= 0);
+
+        if (isempty(u.nodename))
+                return -ENXIO;
+
+        if (streq(u.nodename, "(none)"))
+                return -ENXIO;
+
+        if (is_localhost(u.nodename))
+                return -ENXIO;
+
+        k = strdup(u.nodename);
+        if (!k)
+                return -ENOMEM;
+
+        *ret = k;
+        return 0;
+}
+
 static bool hostname_valid_char(char c) {
         return
                 (c >= 'a' && c <= 'z') ||
diff --git a/src/basic/hostname-util.h b/src/basic/hostname-util.h
index d062eddea1..7af4e6c7ec 100644
--- a/src/basic/hostname-util.h
+++ b/src/basic/hostname-util.h
@@ -26,6 +26,7 @@
 bool hostname_is_set(void);
 
 char* gethostname_malloc(void);
+int gethostname_strict(char **ret);
 
 bool hostname_is_valid(const char *s, bool allow_trailing_dot) _pure_;
 char* hostname_cleanup(char *s);