util: Allow port allocator to skip bind() check

Test suites using the port allocator don't want to have different
behaviour depending on whether a port is in use on the host. Add
a VIR_PORT_ALLOCATOR_SKIP_BIND_CHECK which test suites can use
to skip the bind() test. The port allocator will thus only track
ports in use by the test suite process itself. This is fine when
using the port allocator to generate guest configs which won't
actually be launched
Signed-off-by: NDaniel P. Berrange <berrange@redhat.com>
Signed-off-by: NJim Fehlig <jfehlig@suse.com>

src/libxl/libxl_driver.c

@@ -301,14 +301,15 @@ libxlStateInitialize(bool privileged,
     if (!(libxl_driver->reservedVNCPorts =
           virPortAllocatorNew(_("VNC"),
                               LIBXL_VNC_PORT_MIN,
-                              LIBXL_VNC_PORT_MAX)))
+                              LIBXL_VNC_PORT_MAX,
+                              0)))
         goto error;
 
     /* Allocate bitmap for migration port reservation */
     if (!(libxl_driver->migrationPorts =
           virPortAllocatorNew(_("migration"),
                               LIBXL_MIGRATION_PORT_MIN,
-                              LIBXL_MIGRATION_PORT_MAX)))
+                              LIBXL_MIGRATION_PORT_MAX, 0)))
         goto error;
 
     if (!(libxl_driver->domains = virDomainObjListNew()))

src/qemu/qemu_driver.c

@@ -731,19 +731,22 @@ qemuStateInitialize(bool privileged,
     if ((qemu_driver->remotePorts =
          virPortAllocatorNew(_("display"),
                              cfg->remotePortMin,
-                             cfg->remotePortMax)) == NULL)
+                             cfg->remotePortMax,
+                             0)) == NULL)
         goto error;
 
     if ((qemu_driver->webSocketPorts =
          virPortAllocatorNew(_("webSocket"),
                              cfg->webSocketPortMin,
-                             cfg->webSocketPortMax)) == NULL)
+                             cfg->webSocketPortMax,
+                             0)) == NULL)
         goto error;
 
     if ((qemu_driver->migrationPorts =
          virPortAllocatorNew(_("migration"),
                              cfg->migrationPortMin,
-                             cfg->migrationPortMax)) == NULL)
+                             cfg->migrationPortMax,
+                             0)) == NULL)
         goto error;
 
     if (qemuSecurityInit(qemu_driver) < 0)

src/util/virportallocator.c

@@ -43,6 +43,8 @@ struct _virPortAllocator {
 
     unsigned short start;
     unsigned short end;
+
+    unsigned int flags;
 };
 
 static virClassPtr virPortAllocatorClass;
@@ -71,7 +73,8 @@ VIR_ONCE_GLOBAL_INIT(virPortAllocator)
 
 virPortAllocatorPtr virPortAllocatorNew(const char *name,
                                         unsigned short start,
-                                        unsigned short end)
+                                        unsigned short end,
+                                        unsigned int flags)
 {
     virPortAllocatorPtr pa;
 
@@ -87,6 +90,7 @@ virPortAllocatorPtr virPortAllocatorNew(const char *name,
     if (!(pa = virObjectLockableNew(virPortAllocatorClass)))
         return NULL;
 
+    pa->flags = flags;
     pa->start = start;
     pa->end = end;
 
@@ -190,9 +194,11 @@ int virPortAllocatorAcquire(virPortAllocatorPtr pa,
         if (used)
             continue;
 
-        if (virPortAllocatorBindToPort(&v6used, i, AF_INET6) < 0 ||
-            virPortAllocatorBindToPort(&used, i, AF_INET) < 0)
-            goto cleanup;
+        if (!(pa->flags & VIR_PORT_ALLOCATOR_SKIP_BIND_CHECK)) {
+            if (virPortAllocatorBindToPort(&v6used, i, AF_INET6) < 0 ||
+                virPortAllocatorBindToPort(&used, i, AF_INET) < 0)
+                goto cleanup;
+        }
 
         if (!used && !v6used) {
             /* Add port to bitmap of reserved ports */

src/util/virportallocator.h

@@ -28,9 +28,14 @@
 typedef struct _virPortAllocator virPortAllocator;
 typedef virPortAllocator *virPortAllocatorPtr;
 
+typedef enum {
+    VIR_PORT_ALLOCATOR_SKIP_BIND_CHECK = (1 << 0),
+} virPortAllocatorFlags;
+
 virPortAllocatorPtr virPortAllocatorNew(const char *name,
                                         unsigned short start,
-                                        unsigned short end);
+                                        unsigned short end,
+                                        unsigned int flags);
 
 int virPortAllocatorAcquire(virPortAllocatorPtr pa,
                             unsigned short *port);

tests/virportallocatortest.c

@@ -122,7 +122,7 @@ VIR_LOG_INIT("tests.portallocatortest");
 
 static int testAllocAll(const void *args ATTRIBUTE_UNUSED)
 {
-    virPortAllocatorPtr alloc = virPortAllocatorNew("test", 5900, 5909);
+    virPortAllocatorPtr alloc = virPortAllocatorNew("test", 5900, 5909, 0);
     int ret = -1;
     unsigned short p1, p2, p3, p4, p5, p6, p7;
 
@@ -193,7 +193,7 @@ static int testAllocAll(const void *args ATTRIBUTE_UNUSED)
 
 static int testAllocReuse(const void *args ATTRIBUTE_UNUSED)
 {
-    virPortAllocatorPtr alloc = virPortAllocatorNew("test", 5900, 5910);
+    virPortAllocatorPtr alloc = virPortAllocatorNew("test", 5900, 5910, 0);
     int ret = -1;
     unsigned short p1, p2, p3, p4;