[Date Prev][Date Next]   [Thread Prev][Thread Next]   [Thread Index] [Date Index] [Author Index]

[libvirt] [PATCH v4 1/5] Add TXT record support for virtual DNS service



This commit introduces the <dns> element and <txt> record for the virtual DNS
network. The DNS TXT record can be defined using following syntax in the
network XML file:

  <dns>
    <txt name="example" value="example value" />
  </dns>

Signed-off-by: Michal Novotny <minovotn redhat com>
---
 docs/formatnetwork.html.in                         |   19 ++++
 docs/schemas/network.rng                           |   13 +++
 src/conf/network_conf.c                            |   97 ++++++++++++++++++++
 src/conf/network_conf.h                            |   16 +++
 src/network/bridge_driver.c                        |   21 ++++-
 .../nat-network-dns-txt-record.xml                 |   24 +++++
 .../nat-network-dns-txt-record.xml                 |   24 +++++
 tests/networkxml2xmltest.c                         |    1 +
 8 files changed, 214 insertions(+), 1 deletions(-)
 create mode 100644 tests/networkxml2xmlin/nat-network-dns-txt-record.xml
 create mode 100644 tests/networkxml2xmlout/nat-network-dns-txt-record.xml

diff --git a/docs/formatnetwork.html.in b/docs/formatnetwork.html.in
index 589aaff..008897d 100644
--- a/docs/formatnetwork.html.in
+++ b/docs/formatnetwork.html.in
@@ -114,6 +114,9 @@
     <pre>
         ...
         &lt;mac address='00:16:3E:5D:C7:9E'/&gt;
+        &lt;dns&gt;
+          &lt;txt name="example" value="example value" /&gt;
+        &lt;/dns&gt;
         &lt;ip address="192.168.122.1" netmask="255.255.255.0"&gt;
           &lt;dhcp&gt;
             &lt;range start="192.168.122.100" end="192.168.122.254" /&gt;
@@ -166,6 +169,22 @@
         supported for IPv6 addresses, can only be specified on a single IPv4 address
         per network.
         <span class="since">Since 0.7.1</span>
+
+      </dd><dt><code>dns</code></dt><dd>
+        The dns element of a network contains configuration information for the
+        virtual network's DNS server. <span class="since">Since 0.9.1</span>
+        Currently supported elements are:
+      </dd>
+      <dt><code>txt</code></dt>
+      <dd>A <code>dns</code> element can have 0 or more <code>txt</code> elements.
+      Each txt element defines a DNS TXT record and has two attributes, both
+      required: a name that can be queried via dns, and a value that will be
+      returned when that name is queried. names cannot contain embedded spaces
+      or commas. value is a single string that can contain multiple values which are
+      comma-separated which is allowed for the TXT records and it is represented a
+      single value. <span class="since">Since 0.9.1</span>
+      </dd>
+
       </dd><dt><code>dhcp</code></dt><dd>Also within the <code>ip</code> element there is an
         optional <code>dhcp</code> element. The presence of this element
         enables DHCP services on the virtual network. It will further
diff --git a/docs/schemas/network.rng b/docs/schemas/network.rng
index 6d01b06..3780af5 100644
--- a/docs/schemas/network.rng
+++ b/docs/schemas/network.rng
@@ -87,6 +87,19 @@
           </element>
         </optional>
 
+        <!-- Define the DNS related elements like TXT records
+             and other features in the <dns> element -->
+        <optional>
+            <element name="dns">
+              <zeroOrMore>
+                <element name="txt">
+                  <attribute name="name"><text/></attribute>
+                  <attribute name="value"><text/></attribute>
+                </element>
+              </zeroOrMore>
+            </element>
+        </optional>
+
         <!-- <ip> element -->
         <zeroOrMore>
           <!-- The IP element sets up NAT'ing and an optional DHCP server
diff --git a/src/conf/network_conf.c b/src/conf/network_conf.c
index e4765ea..133ac84 100644
--- a/src/conf/network_conf.c
+++ b/src/conf/network_conf.c
@@ -435,6 +435,69 @@ virNetworkDHCPRangeDefParseXML(const char *networkName,
 }
 
 static int
+virNetworkDNSDefParseXML(virNetworkDNSDefPtr *dnsdef,
+                         xmlNodePtr node)
+{
+    xmlNodePtr cur;
+    int ret = -1;
+    char *name = NULL;
+    char *value = NULL;
+    virNetworkDNSDefPtr def = NULL;
+
+    if (VIR_ALLOC(def)) {
+        virReportOOMError();
+        goto error;
+    }
+
+    cur = node->children;
+    while (cur != NULL) {
+        if (cur->type == XML_ELEMENT_NODE &&
+            xmlStrEqual(cur->name, BAD_CAST "txt")) {
+            if (!(name = virXMLPropString(cur, "name"))) {
+                cur = cur->next;
+                continue;
+            }
+            if (!(value = virXMLPropString(cur, "value"))) {
+                VIR_FREE(name);
+                cur = cur->next;
+                continue;
+            }
+
+            if (strchr(name, ' ') != NULL) {
+                virNetworkReportError(VIR_ERR_XML_DETAIL,
+                                      _("TXT record names in DNS don't support spaces in names (name is '%s')"), name);
+                goto error;
+            }
+
+            if (VIR_REALLOC_N(def->txtrecords, def->ntxtrecords + 1) < 0) {
+                virReportOOMError();
+                goto error;
+            }
+
+            def->txtrecords[def->ntxtrecords].name = name;
+            def->txtrecords[def->ntxtrecords].value = value;
+            def->ntxtrecords++;
+        }
+
+        cur = cur->next;
+    }
+
+    ret = 0;
+error:
+    if (ret < 0) {
+        name = NULL;
+        value = NULL;
+        VIR_FREE(name);
+        VIR_FREE(value);
+    }
+    else
+    if (dnsdef != NULL)
+        *dnsdef = def;
+
+    return ret;
+}
+
+static int
 virNetworkIPParseXML(const char *networkName,
                      virNetworkIpDefPtr def,
                      xmlNodePtr node,
@@ -584,6 +647,7 @@ virNetworkDefParseXML(xmlXPathContextPtr ctxt)
     virNetworkDefPtr def;
     char *tmp;
     xmlNodePtr *ipNodes = NULL;
+    xmlNodePtr dnsNode = NULL;
     int nIps;
 
     if (VIR_ALLOC(def) < 0) {
@@ -641,6 +705,12 @@ virNetworkDefParseXML(xmlXPathContextPtr ctxt)
         def->mac_specified = true;
     }
 
+    dnsNode = virXPathNode("./dns", ctxt);
+    if (dnsNode != NULL) {
+        if (virNetworkDNSDefParseXML(&def->dns, dnsNode) < 0)
+            goto error;
+    }
+
     nIps = virXPathNodeSet("./ip", ctxt, &ipNodes);
     if (nIps < 0)
         goto error;
@@ -695,6 +765,7 @@ virNetworkDefParseXML(xmlXPathContextPtr ctxt)
  error:
     virNetworkDefFree(def);
     VIR_FREE(ipNodes);
+    VIR_FREE(dnsNode);
     return NULL;
 }
 
@@ -751,6 +822,29 @@ cleanup:
 }
 
 static int
+virNetworkDNSDefFormat(virBufferPtr buf,
+                       virNetworkDNSDefPtr def)
+{
+    int result = 0;
+    int i;
+
+    if (def == NULL)
+        goto out;
+
+    virBufferAddLit(buf, "  <dns>\n");
+
+    for (i = 0 ; i < def->ntxtrecords ; i++) {
+        virBufferAsprintf(buf, "    <txt name='%s' value='%s' />\n",
+                              def->txtrecords[i].name,
+                              def->txtrecords[i].value);
+    }
+
+    virBufferAddLit(buf, "  </dns>\n");
+out:
+    return result;
+}
+
+static int
 virNetworkIpDefFormat(virBufferPtr buf,
                       const virNetworkIpDefPtr def)
 {
@@ -881,6 +975,9 @@ char *virNetworkDefFormat(const virNetworkDefPtr def)
     if (def->domain)
         virBufferAsprintf(&buf, "  <domain name='%s'/>\n", def->domain);
 
+    if (virNetworkDNSDefFormat(&buf, def->dns) < 0)
+        goto error;
+
     for (ii = 0; ii < def->nips; ii++) {
         if (virNetworkIpDefFormat(&buf, &def->ips[ii]) < 0)
             goto error;
diff --git a/src/conf/network_conf.h b/src/conf/network_conf.h
index 281124b..d0dac02 100644
--- a/src/conf/network_conf.h
+++ b/src/conf/network_conf.h
@@ -57,6 +57,20 @@ struct _virNetworkDHCPHostDef {
     virSocketAddr ip;
 };
 
+typedef struct _virNetworkDNSTxtRecordsDef virNetworkDNSTxtRecordsDef;
+typedef virNetworkDNSTxtRecordsDef *virNetworkDNSTxtRecordsDefPtr;
+struct _virNetworkDNSTxtRecordsDef {
+    char *name;
+    char *value;
+};
+
+struct virNetworkDNSDef {
+    unsigned int ntxtrecords;
+    virNetworkDNSTxtRecordsDefPtr txtrecords;
+} virNetworkDNSDef;
+
+typedef struct virNetworkDNSDef *virNetworkDNSDefPtr;
+
 typedef struct _virNetworkIpDef virNetworkIpDef;
 typedef virNetworkIpDef *virNetworkIpDefPtr;
 struct _virNetworkIpDef {
@@ -101,6 +115,8 @@ struct _virNetworkDef {
 
     size_t nips;
     virNetworkIpDefPtr ips; /* ptr to array of IP addresses on this network */
+
+    virNetworkDNSDefPtr dns; /* ptr to dns related configuration */
 };
 
 typedef struct _virNetworkObj virNetworkObj;
diff --git a/src/network/bridge_driver.c b/src/network/bridge_driver.c
index 5e4b4d9..169bc08 100644
--- a/src/network/bridge_driver.c
+++ b/src/network/bridge_driver.c
@@ -456,7 +456,6 @@ networkSaveDnsmasqHostsfile(virNetworkIpDefPtr ipdef,
     return 0;
 }
 
-
 static int
 networkBuildDnsmasqArgv(virNetworkObjPtr network,
                         virNetworkIpDefPtr ipdef,
@@ -511,6 +510,26 @@ networkBuildDnsmasqArgv(virNetworkObjPtr network,
     if (network->def->forwardType == VIR_NETWORK_FORWARD_NONE)
         virCommandAddArg(cmd, "--dhcp-option=3");
 
+    if (network->def->dns != NULL) {
+        virNetworkDNSDefPtr dns = network->def->dns;
+        int i;
+
+        for (i = 0; i < dns->ntxtrecords; i++) {
+            virBuffer buf = VIR_BUFFER_INITIALIZER;
+            virBufferAsprintf(&buf, "%s,%s",
+                              dns->txtrecords[i].name,
+                              dns->txtrecords[i].value);
+
+            if (virBufferError(&buf)) {
+                virReportOOMError();
+                goto cleanup;
+            }
+
+            virCommandAddArgPair(cmd, "--txt-record", virBufferContentAndReset(&buf));
+            virBufferFreeAndReset(&buf);
+        }
+    }
+
     /*
      * --interface does not actually work with dnsmasq < 2.47,
      * due to DAD for ipv6 addresses on the interface.
diff --git a/tests/networkxml2xmlin/nat-network-dns-txt-record.xml b/tests/networkxml2xmlin/nat-network-dns-txt-record.xml
new file mode 100644
index 0000000..bd16976
--- /dev/null
+++ b/tests/networkxml2xmlin/nat-network-dns-txt-record.xml
@@ -0,0 +1,24 @@
+<network>
+  <name>default</name>
+  <uuid>81ff0d90-c91e-6742-64da-4a736edb9a9b</uuid>
+  <forward dev='eth1' mode='nat'/>
+  <bridge name='virbr0' stp='on' delay='0' />
+  <dns>
+    <txt name='example' value='example value' />
+  </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-txt-record.xml b/tests/networkxml2xmlout/nat-network-dns-txt-record.xml
new file mode 100644
index 0000000..bd16976
--- /dev/null
+++ b/tests/networkxml2xmlout/nat-network-dns-txt-record.xml
@@ -0,0 +1,24 @@
+<network>
+  <name>default</name>
+  <uuid>81ff0d90-c91e-6742-64da-4a736edb9a9b</uuid>
+  <forward dev='eth1' mode='nat'/>
+  <bridge name='virbr0' stp='on' delay='0' />
+  <dns>
+    <txt name='example' value='example value' />
+  </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 468785b..2cc8e56 100644
--- a/tests/networkxml2xmltest.c
+++ b/tests/networkxml2xmltest.c
@@ -86,6 +86,7 @@ mymain(void)
     DO_TEST("nat-network");
     DO_TEST("netboot-network");
     DO_TEST("netboot-proxy-network");
+    DO_TEST("nat-network-dns-txt-record");
 
     return (ret==0 ? EXIT_SUCCESS : EXIT_FAILURE);
 }
-- 
1.7.3.2


[Date Prev][Date Next]   [Thread Prev][Thread Next]   [Thread Index] [Date Index] [Author Index]