[KVM] Fix VM migration error due to VNC password on libvirt limiting versions (apache#6404)

* [KVM] Fix VM migration error due to VNC password on libvirt limiting versions

* Fix passwd value

* Simplify implementation

(cherry picked from commit b1c8b5a)
Signed-off-by: Rohit Yadav <[email protected]>

Author: nvazquez

plugins/hypervisors/kvm/src/main/java/com/cloud/hypervisor/kvm/resource/wrapper/LibvirtMigrateCommandWrapper.java

@@ -145,7 +145,11 @@ Use VIR_DOMAIN_XML_SECURE (value = 1) prior to v1.0.0.
 
             final String target = command.getDestinationIp();
             xmlDesc = dm.getXMLDesc(xmlFlag);
-            xmlDesc = replaceIpForVNCInDescFile(xmlDesc, target);
+
+            // Limit the VNC password in case the length is greater than 8 characters
+            // Since libvirt version 8 VNC passwords are limited to 8 characters
+            String vncPassword = org.apache.commons.lang3.StringUtils.truncate(to.getVncPassword(), 8);
+            xmlDesc = replaceIpForVNCInDescFileAndNormalizePassword(xmlDesc, target, vncPassword);
 
             String oldIsoVolumePath = getOldVolumePath(disks, vmName);
             String newIsoVolumePath = getNewVolumePathIfDatastoreHasChanged(libvirtComputingResource, conn, to);
@@ -420,16 +424,20 @@ protected MigrateDiskInfo searchDiskDefOnMigrateDiskInfoList(List<MigrateDiskInf
      *     </graphics>
      * @param xmlDesc the qemu xml description
      * @param target the ip address to migrate to
+     * @param vncPassword if set, the VNC password truncated to 8 characters
      * @return the new xmlDesc
      */
-    String replaceIpForVNCInDescFile(String xmlDesc, final String target) {
+    String replaceIpForVNCInDescFileAndNormalizePassword(String xmlDesc, final String target, String vncPassword) {
         final int begin = xmlDesc.indexOf(GRAPHICS_ELEM_START);
         if (begin >= 0) {
             final int end = xmlDesc.lastIndexOf(GRAPHICS_ELEM_END) + GRAPHICS_ELEM_END.length();
             if (end > begin) {
                 String graphElem = xmlDesc.substring(begin, end);
                 graphElem = graphElem.replaceAll("listen='[a-zA-Z0-9\\.]*'", "listen='" + target + "'");
                 graphElem = graphElem.replaceAll("address='[a-zA-Z0-9\\.]*'", "address='" + target + "'");
+                if (org.apache.commons.lang3.StringUtils.isNotBlank(vncPassword)) {
+                    graphElem = graphElem.replaceAll("passwd='([^\\s]+)'", "passwd='" + vncPassword + "'");
+                }
                 xmlDesc = xmlDesc.replaceAll(GRAPHICS_ELEM_START + CONTENTS_WILDCARD + GRAPHICS_ELEM_END, graphElem);
             }
         }

plugins/hypervisors/kvm/src/test/java/com/cloud/hypervisor/kvm/resource/wrapper/LibvirtMigrateCommandWrapperTest.java

@@ -571,53 +571,55 @@ public void setup() throws Exception {
     @Test
     public void testReplaceIpForVNCInDescFile() {
         final String targetIp = "192.168.22.21";
-        final String result = libvirtMigrateCmdWrapper.replaceIpForVNCInDescFile(fullfile, targetIp);
+        final String result = libvirtMigrateCmdWrapper.replaceIpForVNCInDescFileAndNormalizePassword(fullfile, targetIp, null);
         assertTrue("transformation does not live up to expectation:\n" + result, targetfile.equals(result));
     }
 
     @Test
-    public void testReplaceIpForVNCInDesc() {
+    public void testReplaceIpAndPasswordForVNCInDesc() {
         final String xmlDesc =
                 "<domain type='kvm' id='3'>" +
                 "  <devices>" +
-                "    <graphics type='vnc' port='5900' autoport='yes' listen='10.10.10.1'>" +
+                "    <graphics type='vnc' port='5900' autoport='yes' listen='10.10.10.1' passwd='123456789012345'>" +
                 "      <listen type='address' address='10.10.10.1'/>" +
                 "    </graphics>" +
                 "  </devices>" +
                 "</domain>";
         final String expectedXmlDesc =
                 "<domain type='kvm' id='3'>" +
                 "  <devices>" +
-                "    <graphics type='vnc' port='5900' autoport='yes' listen='10.10.10.10'>" +
+                "    <graphics type='vnc' port='5900' autoport='yes' listen='10.10.10.10' passwd='12345678'>" +
                 "      <listen type='address' address='10.10.10.10'/>" +
                 "    </graphics>" +
                 "  </devices>" +
                 "</domain>";
         final String targetIp = "10.10.10.10";
-        final String result = libvirtMigrateCmdWrapper.replaceIpForVNCInDescFile(xmlDesc, targetIp);
+        final String password = "12345678";
+        final String result = libvirtMigrateCmdWrapper.replaceIpForVNCInDescFileAndNormalizePassword(xmlDesc, targetIp, password);
         assertTrue("transformation does not live up to expectation:\n" + result, expectedXmlDesc.equals(result));
     }
 
     @Test
-    public void testReplaceFqdnForVNCInDesc() {
+    public void testReplaceFqdnAndPasswordForVNCInDesc() {
         final String xmlDesc =
                 "<domain type='kvm' id='3'>" +
                 "  <devices>" +
-                "    <graphics type='vnc' port='5900' autoport='yes' listen='localhost.local'>" +
+                "    <graphics type='vnc' port='5900' autoport='yes' listen='localhost.local' passwd='123456789012345'>" +
                 "      <listen type='address' address='localhost.local'/>" +
                 "    </graphics>" +
                 "  </devices>" +
                 "</domain>";
         final String expectedXmlDesc =
                 "<domain type='kvm' id='3'>" +
                 "  <devices>" +
-                "    <graphics type='vnc' port='5900' autoport='yes' listen='localhost.localdomain'>" +
+                "    <graphics type='vnc' port='5900' autoport='yes' listen='localhost.localdomain' passwd='12345678'>" +
                 "      <listen type='address' address='localhost.localdomain'/>" +
                 "    </graphics>" +
                 "  </devices>" +
                 "</domain>";
         final String targetIp = "localhost.localdomain";
-        final String result = libvirtMigrateCmdWrapper.replaceIpForVNCInDescFile(xmlDesc, targetIp);
+        final String password = "12345678";
+        final String result = libvirtMigrateCmdWrapper.replaceIpForVNCInDescFileAndNormalizePassword(xmlDesc, targetIp, password);
         assertTrue("transformation does not live up to expectation:\n" + result, expectedXmlDesc.equals(result));
     }
 
@@ -789,5 +791,4 @@ public void testReplaceDPDKPorts() throws ParserConfigurationException, IOExcept
         Assert.assertTrue(replaced.contains("csdpdk-7"));
         Assert.assertFalse(replaced.contains("csdpdk-1"));
     }
-
 }