some stability improvements

src/dumm/cowfs.c

@@ -858,13 +858,15 @@ cowfs_t *cowfs_create(char *master, char *host, char *mount)
     {
     	DBG1("failed to open master filesystem '%s'", master);
     	free(this);
+    	return NULL;
     }
     this->host_fd = open(host, O_RDONLY | O_DIRECTORY);
-	if (this->master_fd < 0)
+	if (this->host_fd < 0)
     {
     	DBG1("failed to open host filesystem '%s'", host);
     	close(this->master_fd);
     	free(this);
+    	return NULL;
     }
 	this->over_fd = -1;
 	

src/dumm/guest.c

@@ -424,6 +424,7 @@ static void destroy(private_guest_t *this)
 	{
 		close(this->dir);
 	}
+	this->ifaces->destroy(this->ifaces);
 	free(this->dirname);
 	free(this->name);
 	free(this);

src/dumm/iface.c

@@ -205,10 +205,6 @@ iface_t *iface_create(char *guest, char *guestif, mconsole_t *mconsole)
 		free(this);
 		return NULL;
 	}
-	if (!iface_control(this->hostif, TRUE))
-	{
-		DBG1("bringing iface '%s' up failed: %m", this->hostif);
-	}
 	if (!this->mconsole->add_iface(this->mconsole, this->guestif, this->hostif))
 	{
 		DBG1("creating interface '%s' in guest failed", this->guestif);
@@ -218,6 +214,10 @@ iface_t *iface_create(char *guest, char *guestif, mconsole_t *mconsole)
 		free(this);
 		return NULL;
 	}
+	if (!iface_control(this->hostif, TRUE))
+	{
+		DBG1("bringing iface '%s' up failed: %m", this->hostif);
+	}
 	return &this->public;
 }
 

src/dumm/mconsole.c

@@ -156,21 +156,25 @@ static int request(private_mconsole_t *this, char *command,
  */
 static bool add_iface(private_mconsole_t *this, char *guest, char *host)
 {
-	char buf[128];
-	int len;
+	char in[128], out[128];
+	int len, tries = 0;
 	
-	len = snprintf(buf, sizeof(buf), "config %s=tuntap,%s", guest, host);
-	if (len < 0 || len >= sizeof(buf))
+	len = snprintf(in, sizeof(in), "config %s=tuntap,%s", guest, host);
+	if (len < 0 || len >= sizeof(in))
 	{
 		return FALSE;
 	}
-	len = sizeof(buf);
-	if (request(this, buf, buf, &len) != 0)
+	while (tries++ < 10)
 	{
-		DBG1("adding interface failed: %.*s", len, buf);
-		return FALSE;
+		len = sizeof(in);
+		if (request(this, in, out, &len) == 0)
+		{
+			return TRUE;
+		}
+		usleep(10000 * tries);
 	}
-	return TRUE;
+	DBG1("adding interface failed: %.*s", len, out);
+	return FALSE;
 }
 
 /**
@@ -188,7 +192,6 @@ static bool del_iface(private_mconsole_t *this, char *guest)
 	}
 	if (request(this, buf, buf, &len) != 0)
 	{
-		DBG1("removing interface failed: %.*s", len, buf);
 		return FALSE;
 	}
 	return TRUE;