From: Michal Privoznik <[email protected]>

If a DNS forwarder has port specified then we ought to format it
into dnsmasq config. The correct syntax is

  server=/domain/ip-address#port

Closes: https://gitlab.com/libvirt/libvirt/-/issues/833
Signed-off-by: Michal Privoznik <[email protected]>
---
 src/network/bridge_driver.c                               | 6 +++++-
 tests/networkxml2confdata/nat-network-dns-forwarders.conf | 2 +-
 tests/networkxml2confdata/nat-network-dns-forwarders.xml  | 2 +-
 3 files changed, 7 insertions(+), 3 deletions(-)

diff --git a/src/network/bridge_driver.c b/src/network/bridge_driver.c
index 34b655e816..8b5dbb3ab7 100644
--- a/src/network/bridge_driver.c
+++ b/src/network/bridge_driver.c
@@ -1212,10 +1212,14 @@ networkDnsmasqConfContents(virNetworkObj *obj,
                 virBufferAsprintf(&configbuf, "/%s/", fwd->domain);
             if (VIR_SOCKET_ADDR_VALID(&fwd->addr)) {
                 g_autofree char *addr = virSocketAddrFormat(&fwd->addr);
+                int port = virSocketAddrGetPort(&fwd->addr);
 
                 if (!addr)
                     return -1;
-                virBufferAsprintf(&configbuf, "%s\n", addr);
+                virBufferAddStr(&configbuf, addr);
+                if (port > 0)
+                    virBufferAsprintf(&configbuf, "#%d", port);
+                virBufferAddChar(&configbuf, '\n');
                 if (!fwd->domain)
                     addNoResolv = true;
             } else {
diff --git a/tests/networkxml2confdata/nat-network-dns-forwarders.conf 
b/tests/networkxml2confdata/nat-network-dns-forwarders.conf
index 1b0c94c3fb..85d6c6ceb9 100644
--- a/tests/networkxml2confdata/nat-network-dns-forwarders.conf
+++ b/tests/networkxml2confdata/nat-network-dns-forwarders.conf
@@ -7,7 +7,7 @@
 strict-order
 server=8.8.8.8
 server=8.8.4.4
-server=/example.com/192.168.1.1
+server=/example.com/192.168.1.1#1234
 server=/www.example.com/#
 no-resolv
 except-interface=lo
diff --git a/tests/networkxml2confdata/nat-network-dns-forwarders.xml 
b/tests/networkxml2confdata/nat-network-dns-forwarders.xml
index 5d4f3fa697..98d9660b14 100644
--- a/tests/networkxml2confdata/nat-network-dns-forwarders.xml
+++ b/tests/networkxml2confdata/nat-network-dns-forwarders.xml
@@ -6,7 +6,7 @@
   <dns>
     <forwarder addr='8.8.8.8'/>
     <forwarder addr='8.8.4.4'/>
-    <forwarder domain='example.com' addr='192.168.1.1'/>
+    <forwarder domain='example.com' addr='192.168.1.1' port='1234'/>
     <forwarder domain='www.example.com'/>
   </dns>
   <ip address='192.168.122.1' netmask='255.255.255.0'>
-- 
2.51.2

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