util: generalize is_localhost() and use it everywhere where applicable

2 files changed, 17 insertions, 0 deletions

diff --git a/src/shared/util.c b/src/shared/util.c
index a1c8baf237..ceafa019a8 100644
--- a/src/shared/util.c
+++ b/src/shared/util.c
@@ -6732,3 +6732,18 @@ char *tempfn_random(const char *p) {
 
         return t;
 }
+
+/* make sure the hostname is not "localhost" */
+bool is_localhost(const char *hostname) {
+        assert(hostname);
+
+        /* This tries to identify local hostnames described in RFC6761
+         * plus the redhatism of .localdomain */
+
+        return streq(hostname, "localhost") ||
+               streq(hostname, "localhost.") ||
+               endswith(hostname, ".localhost") ||
+               endswith(hostname, ".localhost.") ||
+               endswith(hostname, ".localdomain") ||
+               endswith(hostname, ".localdomain.");
+}
diff --git a/src/shared/util.h b/src/shared/util.h
index 6ad43cd274..6d3791be7f 100644
--- a/src/shared/util.h
+++ b/src/shared/util.h
@@ -959,3 +959,5 @@ int fflush_and_check(FILE *f);
 
 char *tempfn_xxxxxx(const char *p);
 char *tempfn_random(const char *p);
+
+bool is_localhost(const char *hostname);