conf: error out for multiple source elements while parsing chardev

Currently we accept and correctly parse this chardev XML:

  ...
  <channel type='tcp'>
    <source mode='connect'/>
    <source mode='bind' host='localhost'/>
    <source service='4567'/>
    <target type='virtio' name='test'/>
  </channel>
  ...

The parsed formatted XML is:

  ...
  <channel type='tcp'>
    <source mode='connect' host='localhost' service='4567'/>
    <target type='virtio' name='test'/>
  </channel>
  ...

That behavior is super wrong and should not be allowed.  If you notice
the current parse takes the first found attribute and uses that value,
so for example from the "<source mode='bind' host='localhost'/>" only
the "host" attribute is used.  It works the same way for all possible
attributes that we are able to parse for source element.

This patch enforces providing only one source element for all character
devices, only for UDP type we allow to provide two source elements
since you can specify both modes.
Signed-off-by: NPavel Hrdina <phrdina@redhat.com>

src/conf/domain_conf.c

@@ -10925,12 +10925,29 @@ virDomainChrSourceDefParseXML(virDomainChrSourceDefPtr def,
     char *append = NULL;
     char *haveTLS = NULL;
     char *tlsFromConfig = NULL;
+    int sourceParsed = 0;
 
     for (; cur; cur = cur->next) {
         if (cur->type != XML_ELEMENT_NODE)
             continue;
 
         if (virXMLNodeNameEqual(cur, "source")) {
+            /* Parse only the first source element since only one is used
+             * for chardev devices, the only exception is UDP type, where
+             * user can specify two source elements. */
+            if (sourceParsed >= 1 && def->type != VIR_DOMAIN_CHR_TYPE_UDP) {
+                virReportError(VIR_ERR_XML_ERROR, "%s",
+                               _("only one source element is allowed for "
+                                 "character device"));
+                goto error;
+            } else if (sourceParsed >= 2) {
+                virReportError(VIR_ERR_XML_ERROR, "%s",
+                               _("only two source elements are allowed for "
+                                 "character device"));
+                goto error;
+            }
+            sourceParsed++;
+
             if (!mode)
                 mode = virXMLPropString(cur, "mode");
             if (!haveTLS)

tests/genericxml2xmlindata/generic-chardev-tcp-multiple-source.xml

+<domain type='qemu'>
+  <name>QEMUGuest1</name>
+  <uuid>c7a5fdbd-edaf-9455-926a-d65c16db1809</uuid>
+  <memory unit='KiB'>219136</memory>
+  <currentMemory unit='KiB'>219136</currentMemory>
+  <vcpu placement='static'>1</vcpu>
+  <os>
+    <type arch='i686' machine='pc'>hvm</type>
+    <boot dev='hd'/>
+  </os>
+  <clock offset='utc'/>
+  <on_poweroff>destroy</on_poweroff>
+  <on_reboot>restart</on_reboot>
+  <on_crash>destroy</on_crash>
+  <devices>
+    <emulator>/usr/bin/qemu-system-i686</emulator>
+    <controller type='virtio-serial' index='0'/>
+    <channel type='tcp'>
+      <source mode='bind' host='localhost' service='5678'/>
+      <source mode='connect' host='localhost' service='5678'/>
+      <protocol type='raw'/>
+      <target type='virtio' name='test1'/>
+    </channel>
+    <memballoon model='none'/>
+  </devices>
+</domain>

tests/genericxml2xmlindata/generic-chardev-udp-multiple-source.xml

+<domain type='qemu'>
+  <name>QEMUGuest1</name>
+  <uuid>c7a5fdbd-edaf-9455-926a-d65c16db1809</uuid>
+  <memory unit='KiB'>219136</memory>
+  <currentMemory unit='KiB'>219136</currentMemory>
+  <vcpu placement='static'>1</vcpu>
+  <os>
+    <type arch='i686' machine='pc'>hvm</type>
+    <boot dev='hd'/>
+  </os>
+  <clock offset='utc'/>
+  <on_poweroff>destroy</on_poweroff>
+  <on_reboot>restart</on_reboot>
+  <on_crash>destroy</on_crash>
+  <devices>
+    <emulator>/usr/bin/qemu-system-i686</emulator>
+    <controller type='virtio-serial' index='0'/>
+    <channel type='udp'>
+      <source mode='connect' host='localhost' service='5678'/>
+      <source mode='bind' host='localhost' service='4567'/>
+      <source mode='connect' host='localhost' service='3456'/>
+      <target type='virtio' name='test1'/>
+    </channel>
+    <memballoon model='none'/>
+  </devices>
+</domain>

tests/genericxml2xmltest.c

@@ -110,9 +110,13 @@ mymain(void)
                  TEST_COMPARE_DOM_XML2XML_RESULT_FAIL_PARSE);
     DO_TEST_FULL("chardev-tcp-missing-service", 0, false,
                  TEST_COMPARE_DOM_XML2XML_RESULT_FAIL_PARSE);
+    DO_TEST_FULL("chardev-tcp-multiple-source", 0, false,
+                 TEST_COMPARE_DOM_XML2XML_RESULT_FAIL_PARSE);
     DO_TEST_DIFFERENT("chardev-udp");
     DO_TEST_FULL("chardev-udp-missing-connect-service", 0, false,
                  TEST_COMPARE_DOM_XML2XML_RESULT_FAIL_PARSE);
+    DO_TEST_FULL("chardev-udp-multiple-source", 0, false,
+                 TEST_COMPARE_DOM_XML2XML_RESULT_FAIL_PARSE);
     DO_TEST_DIFFERENT("chardev-unix");
     DO_TEST_FULL("chardev-unix-smartcard-missing-path", 0, false,
                  TEST_COMPARE_DOM_XML2XML_RESULT_FAIL_PARSE);