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[libvirt] [PATCH v4 5/5] Network: Add support for DNS hosts definition to the network XML



This commit introduces names definition for the DNS hosts file using
the following syntax:

  <dns>
    <host ip="192.168.1.1">
      <name>alias1</name>
      <name>alias2</name>
    </host>
  </dns>

Signed-off-by: Michal Novotny <minovotn redhat com>
---
 docs/formatnetwork.html.in  |    7 +++
 docs/schemas/network.rng    |    8 +++
 src/conf/network_conf.c     |  115 +++++++++++++++++++++++++++++++++++++++++++
 src/conf/network_conf.h     |    9 +++
 src/network/bridge_driver.c |   24 ++++++---
 tests/networkxml2argvtest.c |    1 +
 tests/networkxml2xmltest.c  |    1 +
 7 files changed, 157 insertions(+), 8 deletions(-)

diff --git a/docs/formatnetwork.html.in b/docs/formatnetwork.html.in
index 95d9c1a..6f28d54 100644
--- a/docs/formatnetwork.html.in
+++ b/docs/formatnetwork.html.in
@@ -225,6 +225,13 @@
         subelements of the <code>host</code> element.
         <span class="since">Since 0.9.1</span>
       </dd>
+      <dt><code>host</code></dt>
+      <dd>The <code>host</code> element is the definition of DNS hosts to be passed
+        to the DNS service. The IP address is identified by the <code>ip</code> attribute
+        and the names for the IP addresses are identified in the <code>hostname</code>
+        subelements of the <code>host</code> element.
+        <span class="since">Since 0.9.1</span>
+      </dd>
     </dl>
 
     <h2><a name="examples">Example configuration</a></h2>
diff --git a/docs/schemas/network.rng b/docs/schemas/network.rng
index 3780af5..d28a93d 100644
--- a/docs/schemas/network.rng
+++ b/docs/schemas/network.rng
@@ -97,6 +97,14 @@
                   <attribute name="value"><text/></attribute>
                 </element>
               </zeroOrMore>
+              <zeroOrMore>
+                <element name="host">
+                  <attribute name="ip"><ref name="ipv4-addr"/></attribute>
+                  <oneOrMore>
+                    <element name="hostname"><text/></element>
+                  </oneOrMore>
+                </element>
+              </zeroOrMore>
             </element>
         </optional>
 
diff --git a/src/conf/network_conf.c b/src/conf/network_conf.c
index 133ac84..56ee1d0 100644
--- a/src/conf/network_conf.c
+++ b/src/conf/network_conf.c
@@ -435,6 +435,53 @@ virNetworkDHCPRangeDefParseXML(const char *networkName,
 }
 
 static int
+virNetworkDNSHostsDefParseXML(virNetworkDNSDefPtr def,
+                              xmlNodePtr node,
+                              virSocketAddr ip)
+{
+    xmlNodePtr cur;
+    int ret = -1;
+
+    if (def->hosts == NULL) {
+        if (VIR_ALLOC(def->hosts) < 0) {
+            virReportOOMError();
+            goto out;
+        }
+        def->nhosts = 0;
+    }
+
+    cur = node->children;
+    while (cur != NULL) {
+        if (cur->type == XML_ELEMENT_NODE &&
+            xmlStrEqual(cur->name, BAD_CAST "hostname")) {
+              if (cur->children != NULL) {
+                  char *hostname;
+
+                  hostname = strdup((char *)cur->children->content);
+
+                  if (VIR_REALLOC_N(def->hosts, def->nhosts + 1) < 0) {
+                      VIR_FREE(hostname);
+                      ret = -1;
+                      virReportOOMError();
+                      goto out;
+                  }
+
+                  def->hosts[def->nhosts].name = hostname;
+                  def->hosts[def->nhosts].ip = ip;
+                  def->nhosts++;
+              }
+        }
+
+        cur = cur->next;
+    }
+
+    ret = 0;
+
+out:
+    return ret;
+}
+
+static int
 virNetworkDNSDefParseXML(virNetworkDNSDefPtr *dnsdef,
                          xmlNodePtr node)
 {
@@ -477,6 +524,27 @@ virNetworkDNSDefParseXML(virNetworkDNSDefPtr *dnsdef,
             def->txtrecords[def->ntxtrecords].name = name;
             def->txtrecords[def->ntxtrecords].value = value;
             def->ntxtrecords++;
+        } else if (cur->type == XML_ELEMENT_NODE &&
+            xmlStrEqual(cur->name, BAD_CAST "host")) {
+            char *ip;
+            virSocketAddr inaddr;
+            memset(&inaddr, 0, sizeof(inaddr));
+
+            if (!(ip = virXMLPropString(cur, "ip"))) {
+                cur = cur->next;
+                continue;
+            }
+            if ((ip == NULL) ||
+                (virSocketParseAddr(ip, &inaddr, AF_UNSPEC) < 0)) {
+                virNetworkReportError(VIR_ERR_XML_DETAIL,
+                                      _("Missing IP address in DNS host definition"));
+                VIR_FREE(ip);
+                goto error;
+            }
+            VIR_FREE(ip);
+            ret = virNetworkDNSHostsDefParseXML(def, cur, inaddr);
+            if (ret < 0)
+                goto error;
         }
 
         cur = cur->next;
@@ -839,6 +907,53 @@ virNetworkDNSDefFormat(virBufferPtr buf,
                               def->txtrecords[i].value);
     }
 
+    if (def->nhosts) {
+        int ii, j;
+        char **iplist = NULL;
+        int iplist_size = 0;
+        bool in_list;
+
+        if (VIR_ALLOC(iplist) < 0) {
+            virReportOOMError();
+            result = -1;
+            goto out;
+        }
+
+        for (ii = 0 ; ii < def->nhosts; ii++) {
+            char *ip = virSocketFormatAddr(&def->hosts[ii].ip);
+            in_list = false;
+
+            for (j = 0; j < iplist_size; j++)
+                if (STREQ(iplist[j], ip))
+                    in_list = true;
+
+            if (!in_list) {
+                virBufferAsprintf(buf, "    <host ip='%s'>\n", ip);
+
+                for (j = 0 ; j < def->nhosts; j++) {
+                    char *thisip = virSocketFormatAddr(&def->hosts[j].ip);
+                    if (STREQ(ip, thisip))
+                        virBufferAsprintf(buf, "      <hostname>%s</hostname>\n",
+                                               def->hosts[j].name);
+                }
+                virBufferAsprintf(buf, "    </host>\n");
+
+                if (VIR_REALLOC_N(iplist, iplist_size + 1) < 0) {
+                    virReportOOMError();
+                    result = -1;
+                    goto out;
+                }
+
+                iplist[iplist_size] = ip;
+                iplist_size++;
+            }
+        }
+
+        for (j = 0; j < iplist_size; j++)
+            VIR_FREE(iplist[j]);
+        VIR_FREE(iplist);
+    }
+
     virBufferAddLit(buf, "  </dns>\n");
 out:
     return result;
diff --git a/src/conf/network_conf.h b/src/conf/network_conf.h
index d0dac02..50b3713 100644
--- a/src/conf/network_conf.h
+++ b/src/conf/network_conf.h
@@ -64,9 +64,18 @@ struct _virNetworkDNSTxtRecordsDef {
     char *value;
 };
 
+struct virNetworkDNSHostsDef {
+    virSocketAddr ip;
+    char *name;
+} virNetworkDNSHostsDef;
+
+typedef struct virNetworkDNSHostsDef *virNetworkDNSHostsDefPtr;
+
 struct virNetworkDNSDef {
     unsigned int ntxtrecords;
+    unsigned int nhosts;
     virNetworkDNSTxtRecordsDefPtr txtrecords;
+    virNetworkDNSHostsDefPtr hosts;
 } virNetworkDNSDef;
 
 typedef struct virNetworkDNSDef *virNetworkDNSDefPtr;
diff --git a/src/network/bridge_driver.c b/src/network/bridge_driver.c
index 8f68f1c..90bbc1d 100644
--- a/src/network/bridge_driver.c
+++ b/src/network/bridge_driver.c
@@ -436,6 +436,7 @@ networkShutdown(void) {
 
 static dnsmasqContext*
 networkSaveDnsmasqHostsfile(virNetworkIpDefPtr ipdef,
+                            virNetworkDNSDefPtr dnsdef,
                             char *name,
                             bool force)
 {
@@ -448,13 +449,20 @@ networkSaveDnsmasqHostsfile(virNetworkIpDefPtr ipdef,
         goto cleanup;
     }
 
-    if (! force && virFileExists(dctx->hostsfile->path))
-        return 0;
+    if (!(! force && virFileExists(dctx->hostsfile->path))) {
+        for (i = 0; i < ipdef->nhosts; i++) {
+            virNetworkDHCPHostDefPtr host = &(ipdef->hosts[i]);
+            if ((host->mac) && VIR_SOCKET_HAS_ADDR(&host->ip))
+                dnsmasqAddDhcpHost(dctx, host->mac, &host->ip, host->name);
+        }
+    }
 
-    for (i = 0; i < ipdef->nhosts; i++) {
-        virNetworkDHCPHostDefPtr host = &(ipdef->hosts[i]);
-        if ((host->mac) && VIR_SOCKET_HAS_ADDR(&host->ip))
-            dnsmasqAddDhcpHost(dctx, host->mac, &host->ip, host->name);
+    if (dnsdef) {
+        for (i = 0; i < dnsdef->nhosts; i++) {
+            virNetworkDNSHostsDefPtr host = &(dnsdef->hosts[i]);
+            if (VIR_SOCKET_HAS_ADDR(&host->ip))
+                dnsmasqAddHost(dctx, &host->ip, host->name);
+        }
     }
 
     if (dnsmasqSave(dctx) < 0)
@@ -605,7 +613,7 @@ networkBuildDnsmasqArgv(virNetworkObjPtr network,
         if (ipdef->nranges || ipdef->nhosts)
             virCommandAddArg(cmd, "--dhcp-no-override");
 
-        if ((dctx = networkSaveDnsmasqHostsfile(ipdef, network->def->name, false))) {
+        if ((dctx = networkSaveDnsmasqHostsfile(ipdef, network->def->dns, network->def->name, false))) {
             if (dctx->hostsfile->nhosts)
                 virCommandAddArgPair(cmd, "--dhcp-hostsfile",
                                      dctx->hostsfile->path);
@@ -2241,7 +2249,7 @@ static virNetworkPtr networkDefine(virConnectPtr conn, const char *xml) {
         }
     }
     if (ipv4def) {
-        dnsmasqContext* dctx = networkSaveDnsmasqHostsfile(ipv4def, network->def->name, true);
+        dnsmasqContext* dctx = networkSaveDnsmasqHostsfile(ipv4def, network->def->dns, network->def->name, true);
         if (dctx == NULL)
             goto cleanup;
         dnsmasqContextFree(dctx);
diff --git a/tests/networkxml2argvtest.c b/tests/networkxml2argvtest.c
index 5e7f455..78f61ca 100644
--- a/tests/networkxml2argvtest.c
+++ b/tests/networkxml2argvtest.c
@@ -92,6 +92,7 @@ mymain(void)
     DO_TEST("netboot-network");
     DO_TEST("netboot-proxy-network");
     DO_TEST("nat-network-dns-txt-record");
+    DO_TEST("nat-network-dns-hosts");
 
     return (ret==0 ? EXIT_SUCCESS : EXIT_FAILURE);
 }
diff --git a/tests/networkxml2xmltest.c b/tests/networkxml2xmltest.c
index 2cc8e56..065166d 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-hosts");
 
     return (ret==0 ? EXIT_SUCCESS : EXIT_FAILURE);
 }
-- 
1.7.3.2


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