platform: add nmp_netns_bind_to_path() helper function

[NetworkManager.git] / src / platform / nmp-netns.c

diff --git a/src/platform/nmp-netns.c b/src/platform/nmp-netns.c
index 5b1d6ad..2629585 100644 (file)
--- a/src/platform/nmp-netns.c
+++ b/src/platform/nmp-netns.c
@@ -24,6 +24,8 @@
 #include <fcntl.h>
 #include <errno.h>
 #include <sys/mount.h>
+#include <sys/stat.h>
+#include <sys/types.h>
 
 #include "NetworkManagerUtils.h"
 
@@ -579,6 +581,84 @@ nmp_netns_is_initial (void)
 
 /*********************************************************************************************/
 
+gboolean
+nmp_netns_bind_to_path (NMPNetns *self, const char *filename, int *out_fd)
+{
+       gs_free char *dirname = NULL;
+       int errsv;
+       int fd;
+       nm_auto_pop_netns NMPNetns *netns_pop = NULL;
+
+       g_return_val_if_fail (NMP_IS_NETNS (self), FALSE);
+       g_return_val_if_fail (filename && filename[0] == '/', FALSE);
+
+       if (!nmp_netns_push_type (self, CLONE_NEWNET))
+               return FALSE;
+       netns_pop = self;
+
+       dirname = g_path_get_dirname (filename);
+       if (mkdir (dirname, 0) != 0) {
+               errsv = errno;
+               if (errsv != EEXIST) {
+                       _LOGE (self, "bind: failed to create directory %s: %s",
+                              dirname, g_strerror (errsv));
+                       return FALSE;
+               }
+       }
+
+       if ((fd = creat (filename, S_IRUSR | S_IRGRP | S_IROTH)) == -1) {
+               errsv = errno;
+               _LOGE (self, "bind: failed to create %s: %s",
+                      filename, g_strerror (errsv));
+               return FALSE;
+       }
+       close (fd);
+
+       if (mount (PROC_SELF_NS_NET, filename, "none", MS_BIND, NULL) != 0) {
+               errsv = errno;
+               _LOGE (self, "bind: failed to mount %s to %s: %s",
+                      PROC_SELF_NS_NET, filename, g_strerror (errsv));
+               unlink (filename);
+               return FALSE;
+       }
+
+       if (out_fd) {
+               if ((fd = open (filename, O_RDONLY)) == -1) {
+                       errsv = errno;
+                       _LOGE (self, "bind: failed to open %s: %s", filename, g_strerror (errsv));
+                       umount2 (filename, MNT_DETACH);
+                       unlink (filename);
+                       return FALSE;
+               }
+               *out_fd = fd;
+       }
+
+       return TRUE;
+}
+
+gboolean
+nmp_netns_bind_to_path_destroy (NMPNetns *self, const char *filename)
+{
+       int errsv;
+
+       g_return_val_if_fail (NMP_IS_NETNS (self), FALSE);
+       g_return_val_if_fail (filename && filename[0] == '/', FALSE);
+
+       if (umount2 (filename, MNT_DETACH) != 0) {
+               errsv = errno;
+               _LOGE (self, "bind: failed to unmount2 %s: %s", filename, g_strerror (errsv));
+               return FALSE;
+       }
+       if (unlink (filename) != 0) {
+               errsv = errno;
+               _LOGE (self, "bind: failed to unlink %s: %s", filename, g_strerror (errsv));
+               return FALSE;
+       }
+       return TRUE;
+}
+
+/******************************************************************************/
+
 static void
 set_property (GObject *object, guint prop_id,
               const GValue *value, GParamSpec *pspec)