core: use hostnamed to set the transient hostname

In commit 6dc35e66d45e ("settings: add hostnamed support") we started
to use systemd-hostnamed for setting the system static hostname
(i.e. the one written to /etc/hostname), but nm-policy.c still called
sethostname() to set the transient (dynamic) hostname when this needs
to be changed, for example after a reverse lookup of our dynamic IP
address.

Thus, when using systemd the hostname change failed because process'
capabilities are restricted and sethostname() requires CAP_SYS_ADMIN.

We should set also the transient hostname through hostnamed when this
is available.

https://bugzilla.redhat.com/show_bug.cgi?id=1308974

1 files changed, 7 insertions, 0 deletions

diff --git a/src/settings/nm-settings.h b/src/settings/nm-settings.h
index 923b164b04..051c209423 100644
--- a/src/settings/nm-settings.h
+++ b/src/settings/nm-settings.h
@@ -71,6 +71,8 @@ typedef struct {
 	void (*agent_registered) (NMSettings *self, NMSecretAgent *agent);
 } NMSettingsClass;
 
+typedef void (*NMSettingsSetHostnameCb) (const char *name, gboolean result, gpointer user_data);
+
 GType nm_settings_get_type (void);
 
 NMSettings *nm_settings_new (void);
@@ -127,4 +129,9 @@ gint nm_settings_sort_connections (gconstpointer a, gconstpointer b);
 
 gboolean nm_settings_get_startup_complete (NMSettings *self);
 
+void nm_settings_set_transient_hostname (NMSettings *self,
+                                         const char *hostname,
+                                         NMSettingsSetHostnameCb cb,
+                                         gpointer user_data);
+
 #endif  /* __NM_SETTINGS_H__ */