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[libvirt] [PATCH] Implement DNS SRV record into the bridge driver



Hi,
this is the patch to the bridge driver and libvirt XML
file to include support for the SRV records in the DNS.
The syntax is based on DNSMasq man page and tests for
both xml2xml and xml2argv were added as well.

Signed-off-by: Michal Novotny <minovotn redhat com>
---
 docs/formatnetwork.html.in                         |   12 ++
 docs/schemas/network.rng                           |   30 +++++
 src/conf/network_conf.c                            |  125 ++++++++++++++++++++
 src/conf/network_conf.h                            |   14 ++
 src/network/bridge_driver.c                        |   18 +++
 .../nat-network-dns-srv-record.argv                |    1 +
 .../nat-network-dns-srv-record.xml                 |   26 ++++
 tests/networkxml2argvtest.c                        |    1 +
 .../nat-network-dns-srv-record.xml                 |   26 ++++
 .../nat-network-dns-srv-record.xml                 |   26 ++++
 tests/networkxml2xmltest.c                         |    1 +
 12 files changed, 281 insertions(+), 1 deletions(-)
 create mode 100644 tests/networkxml2argvdata/nat-network-dns-srv-record.argv
 create mode 100644 tests/networkxml2argvdata/nat-network-dns-srv-record.xml
 create mode 100644 tests/networkxml2xmlin/nat-network-dns-srv-record.xml
 create mode 100644 tests/networkxml2xmlout/nat-network-dns-srv-record.xml

diff --git a/docs/formatnetwork.html.in b/docs/formatnetwork.html.in
index ddfa77c..4f748c4 100644
--- a/docs/formatnetwork.html.in
+++ b/docs/formatnetwork.html.in
@@ -148,6 +148,7 @@
         &lt;mac address='00:16:3E:5D:C7:9E'/&gt;
         &lt;dns&gt;
           &lt;txt name="example" value="example value" /&gt;
+          &lt;srv service="name" protocol="tcp" domain="test-domain-name" target="." port="1024" priority="10" weight="10"/&gt;
         &lt;/dns&gt;
         &lt;ip address="192.168.122.1" netmask="255.255.255.0"&gt;
           &lt;dhcp&gt;
@@ -196,6 +197,17 @@
             <span class="since">Since 0.9.3</span>
           </dd>
         </dl>
+        <dl>
+          <dt><code>srv</code></dt>
+          <dd>The <code>dns</code> element can have also 0 or more <code>srv</code>
+            record elements. Each srv record element defines a DNS SRV record
+            and has 2 mandatory and 4 optional attributes. The mandatory attributes
+            are service name and protocol (tcp, udp) and you can define optional
+            target, port, priority and weight arguments. The body of the element
+            have to be set to some data and therefore it's a pair tag.
+            <span class="since">Since 0.9.5</span>
+          </dd>
+        </dl>
       </dd>
       <dt><code>ip</code></dt>
       <dd>The <code>address</code> attribute defines an IPv4 address in
diff --git a/docs/schemas/network.rng b/docs/schemas/network.rng
index 1c44471..413698a 100644
--- a/docs/schemas/network.rng
+++ b/docs/schemas/network.rng
@@ -138,6 +138,22 @@
                 </element>
               </zeroOrMore>
               <zeroOrMore>
+                <element name="srv">
+                  <attribute name="service"><text/></attribute>
+                  <attribute name="protocol">
+                    <choice>
+                      <value>tcp</value>
+                      <value>udp</value>
+                    </choice>
+                  </attribute>
+                  <attribute name="domain"><text/></attribute>
+                  <attribute name="target"><text/></attribute>
+                  <attribute name="port"><ref name="port-for-user"/></attribute>
+                  <attribute name="priority"><ref name="short-int"/></attribute>
+                  <attribute name="weight"><ref name="short-int"/></attribute>
+                </element>
+              </zeroOrMore>
+              <zeroOrMore>
                 <element name="host">
                   <attribute name="ip"><ref name="ipv4Addr"/></attribute>
                   <oneOrMore>
@@ -206,6 +222,20 @@
     </element>
   </define>
 
+  <define name="port-for-user">
+    <data type="integer">
+      <param name="minInclusive">1024</param>
+      <param name="maxInclusive">65535</param>
+    </data>
+  </define>
+
+  <define name="short-int">
+    <data type="integer">
+      <param name="minInclusive">0</param>
+      <param name="maxInclusive">127</param>
+    </data>
+  </define>
+
   <define name='addr-family'>
     <data type='string'>
       <param name="pattern">(ipv4)|(ipv6)</param>
diff --git a/src/conf/network_conf.c b/src/conf/network_conf.c
index b11c482..120b149 100644
--- a/src/conf/network_conf.c
+++ b/src/conf/network_conf.c
@@ -137,6 +137,14 @@ static void virNetworkDNSDefFree(virNetworkDNSDefPtr def)
             }
             VIR_FREE(def->hosts);
         }
+	if (def->nsrvrecords) {
+            while (def->nsrvrecords--) {
+              VIR_FREE(def->srvrecords[def->nsrvrecords].domain);
+              VIR_FREE(def->srvrecords[def->nsrvrecords].service);
+              VIR_FREE(def->srvrecords[def->nsrvrecords].protocol);
+              VIR_FREE(def->srvrecords[def->nsrvrecords].target);
+            }
+        }
         VIR_FREE(def);
     }
 }
@@ -552,6 +560,107 @@ error:
 }
 
 static int
+virNetworkDNSSrvDefParseXML(virNetworkDNSDefPtr def,
+                            xmlNodePtr cur)
+{
+    char *domain = NULL;
+    char *service = NULL;
+    char *protocol = NULL;
+    char *target = NULL;
+    char *portString = NULL;
+    char *priorityString = NULL;
+    char *weightString = NULL;
+    int port;
+    int priority;
+    int weight;
+    int ret = 0;
+
+    if (!(service = virXMLPropString(cur, "service"))) {
+        virNetworkReportError(VIR_ERR_XML_DETAIL,
+                              "%s", _("Missing required service attribute in dns srv record"));
+        goto error;
+    }
+    if (!(protocol = virXMLPropString(cur, "protocol"))) {
+        virNetworkReportError(VIR_ERR_XML_DETAIL,
+                              _("Missing required protocol attribute in dns srv record '%s'"), service);
+        goto error;
+    }
+
+    target = virXMLPropString(cur, "target");
+    domain = virXMLPropString(cur, "domain");
+    portString = virXMLPropString(cur, "port");
+    priorityString = virXMLPropString(cur, "priority");
+    weightString = virXMLPropString(cur, "weight");
+
+    if (VIR_REALLOC_N(def->srvrecords, def->nsrvrecords + 1) < 0) {
+        virReportOOMError();
+        goto error;
+    }
+
+    if (portString &&
+        virStrToLong_i(portString, NULL, 10, &port) < 0) {
+        virNetworkReportError(VIR_ERR_INTERNAL_ERROR, "%s",
+                             _("Cannot parse 'port' attribute"));
+        goto error;
+    }
+
+    if (priorityString &&
+        virStrToLong_i(priorityString, NULL, 10, &priority) < 0) {
+        virNetworkReportError(VIR_ERR_INTERNAL_ERROR, "%s",
+                             _("Cannot parse 'priority' attribute"));
+        goto error;
+    }
+
+    if (weightString &&
+        virStrToLong_i(weightString, NULL, 10, &weight) < 0) {
+        virNetworkReportError(VIR_ERR_INTERNAL_ERROR, "%s",
+                             _("Cannot parse 'weight' attribute"));
+        goto error;
+    }
+
+    def->srvrecords[def->nsrvrecords].domain = domain;
+    def->srvrecords[def->nsrvrecords].service = service;
+    def->srvrecords[def->nsrvrecords].protocol = protocol;
+    def->srvrecords[def->nsrvrecords].target = target;
+    def->srvrecords[def->nsrvrecords].port = port;
+    def->srvrecords[def->nsrvrecords].priority = priority;
+    def->srvrecords[def->nsrvrecords].weight = weight;
+    def->nsrvrecords++;
+
+    goto cleanup;
+
+error:
+    if (domain)
+        VIR_FREE(domain);
+    if (service)
+        VIR_FREE(service);
+    if (protocol)
+        VIR_FREE(protocol);
+    if (target)
+        VIR_FREE(target);
+
+    ret = 1;
+
+cleanup:
+    if (portString)
+        VIR_FREE(portString);
+    if (priorityString)
+        VIR_FREE(priorityString);
+    if (weightString)
+        VIR_FREE(weightString);
+
+    domain = NULL;
+    service = NULL;
+    protocol = NULL;
+    target = NULL;
+    portString = NULL;
+    priorityString = NULL;
+    weightString = NULL;
+
+    return ret;
+}
+
+static int
 virNetworkDNSDefParseXML(virNetworkDNSDefPtr *dnsdef,
                          xmlNodePtr node)
 {
@@ -598,6 +707,11 @@ virNetworkDNSDefParseXML(virNetworkDNSDefPtr *dnsdef,
             name = NULL;
             value = NULL;
         } else if (cur->type == XML_ELEMENT_NODE &&
+            xmlStrEqual(cur->name, BAD_CAST "srv")) {
+            ret = virNetworkDNSSrvDefParseXML(def, cur);
+            if (ret < 0)
+                goto error;
+        } else if (cur->type == XML_ELEMENT_NODE &&
             xmlStrEqual(cur->name, BAD_CAST "host")) {
             ret = virNetworkDNSHostsDefParseXML(def, cur);
             if (ret < 0)
@@ -1147,6 +1261,17 @@ virNetworkDNSDefFormat(virBufferPtr buf,
                               def->txtrecords[i].value);
     }
 
+    for (i = 0 ; i < def->nsrvrecords ; i++) {
+        virBufferAsprintf(buf, "    <srv service='%s' protocol='%s' domain='%s' target='%s' port='%d' priority='%d' weight='%d' />\n",
+                              def->srvrecords[i].service,
+                              def->srvrecords[i].protocol,
+                              def->srvrecords[i].domain,
+                              def->srvrecords[i].target,
+                              def->srvrecords[i].port,
+                              def->srvrecords[i].priority,
+                              def->srvrecords[i].weight);
+    }
+
     if (def->nhosts) {
         int ii, j;
 
diff --git a/src/conf/network_conf.h b/src/conf/network_conf.h
index 869085e..08e08b2 100644
--- a/src/conf/network_conf.h
+++ b/src/conf/network_conf.h
@@ -67,6 +67,18 @@ struct _virNetworkDNSTxtRecordsDef {
     char *value;
 };
 
+typedef struct _virNetworkDNSSrvRecordsDef virNetworkDNSSrvRecordsDef;
+typedef virNetworkDNSSrvRecordsDef *virNetworkDNSSrvRecordsDefPtr;
+struct _virNetworkDNSSrvRecordsDef {
+    char *domain;
+    char *service;
+    char *protocol;
+    char *target;
+    int port;
+    int priority;
+    int weight;
+};
+
 struct _virNetworkDNSHostsDef {
     virSocketAddr ip;
     int nnames;
@@ -80,6 +92,8 @@ struct _virNetworkDNSDef {
     virNetworkDNSTxtRecordsDefPtr txtrecords;
     unsigned int nhosts;
     virNetworkDNSHostsDefPtr hosts;
+    unsigned int nsrvrecords;
+    virNetworkDNSSrvRecordsDefPtr srvrecords;
 };
 
 typedef struct _virNetworkDNSDef *virNetworkDNSDefPtr;
diff --git a/src/network/bridge_driver.c b/src/network/bridge_driver.c
index c90db63..e7f3b26 100644
--- a/src/network/bridge_driver.c
+++ b/src/network/bridge_driver.c
@@ -559,6 +559,24 @@ networkBuildDnsmasqArgv(virNetworkObjPtr network,
             virCommandAddArgPair(cmd, "--txt-record", record);
             VIR_FREE(record);
         }
+
+        for (i = 0; i < dns->nsrvrecords; i++) {
+            char *record = NULL;
+            if (virAsprintf(&record, "%s.%s.%s,%s,%d,%d,%d",
+                            dns->srvrecords[i].service,
+                            dns->srvrecords[i].protocol,
+                            dns->srvrecords[i].domain,
+                            dns->srvrecords[i].target,
+                            dns->srvrecords[i].port,
+                            dns->srvrecords[i].priority,
+                            dns->srvrecords[i].weight) < 0) {
+                virReportOOMError();
+                goto cleanup;
+            }
+
+            virCommandAddArgPair(cmd, "--srv-host", record);
+            VIR_FREE(record);
+        }
     }
 
     /*
diff --git a/tests/networkxml2argvdata/nat-network-dns-srv-record.argv b/tests/networkxml2argvdata/nat-network-dns-srv-record.argv
new file mode 100644
index 0000000..2ea9809
--- /dev/null
+++ b/tests/networkxml2argvdata/nat-network-dns-srv-record.argv
@@ -0,0 +1 @@
+/usr/sbin/dnsmasq --strict-order --bind-interfaces --conf-file= --except-interface lo --srv-host=name.tcp.test-domain-name,.,1024,10,10 --listen-address 192.168.122.1 --listen-address 192.168.123.1 --listen-address 2001:db8:ac10:fe01::1 --listen-address 2001:db8:ac10:fd01::1 --listen-address 10.24.10.1 --dhcp-range 192.168.122.2,192.168.122.254 --dhcp-leasefile=/var/lib/libvirt/dnsmasq/default.leases --dhcp-lease-max=253 --dhcp-no-override --dhcp-hostsfile=/var/lib/libvirt/dnsmasq/default.hostsfile
\ No newline at end of file
diff --git a/tests/networkxml2argvdata/nat-network-dns-srv-record.xml b/tests/networkxml2argvdata/nat-network-dns-srv-record.xml
new file mode 100644
index 0000000..4be85b5
--- /dev/null
+++ b/tests/networkxml2argvdata/nat-network-dns-srv-record.xml
@@ -0,0 +1,26 @@
+<network>
+  <name>default</name>
+  <uuid>81ff0d90-c91e-6742-64da-4a736edb9a9b</uuid>
+  <forward dev='eth1' mode='nat'>
+    <interface dev='eth1'/>
+  </forward>
+  <bridge name='virbr0' stp='on' delay='0' />
+  <dns>
+    <srv service='name' protocol='tcp' domain='test-domain-name' target='.' port='1024' priority='10' weight='10' />
+  </dns>
+  <ip address='192.168.122.1' netmask='255.255.255.0'>
+    <dhcp>
+      <range start='192.168.122.2' end='192.168.122.254' />
+      <host mac='00:16:3e:77:e2:ed' name='a.example.com' ip='192.168.122.10' />
+      <host mac='00:16:3e:3e:a9:1a' name='b.example.com' ip='192.168.122.11' />
+    </dhcp>
+  </ip>
+  <ip family='ipv4' address='192.168.123.1' netmask='255.255.255.0'>
+  </ip>
+  <ip family='ipv6' address='2001:db8:ac10:fe01::1' prefix='64'>
+  </ip>
+  <ip family='ipv6' address='2001:db8:ac10:fd01::1' prefix='64'>
+  </ip>
+  <ip family='ipv4' address='10.24.10.1'>
+  </ip>
+</network>
diff --git a/tests/networkxml2argvtest.c b/tests/networkxml2argvtest.c
index 4a11d6f..a9da613 100644
--- a/tests/networkxml2argvtest.c
+++ b/tests/networkxml2argvtest.c
@@ -120,6 +120,7 @@ mymain(void)
     DO_TEST("netboot-network");
     DO_TEST("netboot-proxy-network");
     DO_TEST("nat-network-dns-txt-record");
+    DO_TEST("nat-network-dns-srv-record");
     DO_TEST("nat-network-dns-hosts");
 
     return (ret==0 ? EXIT_SUCCESS : EXIT_FAILURE);
diff --git a/tests/networkxml2xmlin/nat-network-dns-srv-record.xml b/tests/networkxml2xmlin/nat-network-dns-srv-record.xml
new file mode 100644
index 0000000..4be85b5
--- /dev/null
+++ b/tests/networkxml2xmlin/nat-network-dns-srv-record.xml
@@ -0,0 +1,26 @@
+<network>
+  <name>default</name>
+  <uuid>81ff0d90-c91e-6742-64da-4a736edb9a9b</uuid>
+  <forward dev='eth1' mode='nat'>
+    <interface dev='eth1'/>
+  </forward>
+  <bridge name='virbr0' stp='on' delay='0' />
+  <dns>
+    <srv service='name' protocol='tcp' domain='test-domain-name' target='.' port='1024' priority='10' weight='10' />
+  </dns>
+  <ip address='192.168.122.1' netmask='255.255.255.0'>
+    <dhcp>
+      <range start='192.168.122.2' end='192.168.122.254' />
+      <host mac='00:16:3e:77:e2:ed' name='a.example.com' ip='192.168.122.10' />
+      <host mac='00:16:3e:3e:a9:1a' name='b.example.com' ip='192.168.122.11' />
+    </dhcp>
+  </ip>
+  <ip family='ipv4' address='192.168.123.1' netmask='255.255.255.0'>
+  </ip>
+  <ip family='ipv6' address='2001:db8:ac10:fe01::1' prefix='64'>
+  </ip>
+  <ip family='ipv6' address='2001:db8:ac10:fd01::1' prefix='64'>
+  </ip>
+  <ip family='ipv4' address='10.24.10.1'>
+  </ip>
+</network>
diff --git a/tests/networkxml2xmlout/nat-network-dns-srv-record.xml b/tests/networkxml2xmlout/nat-network-dns-srv-record.xml
new file mode 100644
index 0000000..4be85b5
--- /dev/null
+++ b/tests/networkxml2xmlout/nat-network-dns-srv-record.xml
@@ -0,0 +1,26 @@
+<network>
+  <name>default</name>
+  <uuid>81ff0d90-c91e-6742-64da-4a736edb9a9b</uuid>
+  <forward dev='eth1' mode='nat'>
+    <interface dev='eth1'/>
+  </forward>
+  <bridge name='virbr0' stp='on' delay='0' />
+  <dns>
+    <srv service='name' protocol='tcp' domain='test-domain-name' target='.' port='1024' priority='10' weight='10' />
+  </dns>
+  <ip address='192.168.122.1' netmask='255.255.255.0'>
+    <dhcp>
+      <range start='192.168.122.2' end='192.168.122.254' />
+      <host mac='00:16:3e:77:e2:ed' name='a.example.com' ip='192.168.122.10' />
+      <host mac='00:16:3e:3e:a9:1a' name='b.example.com' ip='192.168.122.11' />
+    </dhcp>
+  </ip>
+  <ip family='ipv4' address='192.168.123.1' netmask='255.255.255.0'>
+  </ip>
+  <ip family='ipv6' address='2001:db8:ac10:fe01::1' prefix='64'>
+  </ip>
+  <ip family='ipv6' address='2001:db8:ac10:fd01::1' prefix='64'>
+  </ip>
+  <ip family='ipv4' address='10.24.10.1'>
+  </ip>
+</network>
diff --git a/tests/networkxml2xmltest.c b/tests/networkxml2xmltest.c
index 5cdbedb..8ee8e0e 100644
--- a/tests/networkxml2xmltest.c
+++ b/tests/networkxml2xmltest.c
@@ -87,6 +87,7 @@ mymain(void)
     DO_TEST("netboot-network");
     DO_TEST("netboot-proxy-network");
     DO_TEST("nat-network-dns-txt-record");
+    DO_TEST("nat-network-dns-srv-record");
     DO_TEST("nat-network-dns-hosts");
     DO_TEST("8021Qbh-net");
     DO_TEST("direct-net");
-- 
1.7.4.4


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