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network: allow "modify" option for DNS-Txt records

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The "modify" command allows to replace an existing record (its
text value). The primary key is the name of the record. If
duplicity or missing record detected, throw error.

Tests in networkxml2xmlupdatetest.c contain replacements of an
existing DNS-text record and failure due to non-existing record.

Resolves: https://gitlab.com/libvirt/libvirt/-/issues/639
Signed-off-by: Adam Julis <ajulis@redhat.com>
Signed-off-by: Michal Privoznik <mprivozn@redhat.com>
Reviewed-by: Michal Privoznik <mprivozn@redhat.com>
This commit is contained in:
Adam Julis 2024-07-09 17:23:31 +02:00 committed by Michal Privoznik
parent cf934c87cc
commit 7a9e9dfb18
5 changed files with 49 additions and 6 deletions
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18
src/conf/network_conf.c
View File

@ -3353,12 +3353,6 @@ virNetworkDefUpdateDNSTxt(virNetworkDef *def,
bool isAdd = (command == VIR_NETWORK_UPDATE_COMMAND_ADD_FIRST ||
command == VIR_NETWORK_UPDATE_COMMAND_ADD_LAST);
if (command == VIR_NETWORK_UPDATE_COMMAND_MODIFY) {
virReportError(VIR_ERR_OPERATION_UNSUPPORTED, "%s",
_("DNS TXT records cannot be modified, only added or deleted"));
goto cleanup;
}
if (virNetworkDefUpdateCheckElementName(def, ctxt->node, "txt") < 0)
goto cleanup;
@ -3397,6 +3391,18 @@ virNetworkDefUpdateDNSTxt(virNetworkDef *def,
virNetworkDNSTxtDefClear(&dns->txts[foundIdx]);
VIR_DELETE_ELEMENT(dns->txts, foundIdx, dns->ntxts);
} else if (command == VIR_NETWORK_UPDATE_COMMAND_MODIFY) {
if (foundIdx == dns->ntxts) {
virReportError(VIR_ERR_OPERATION_INVALID,
_("couldn't locate a matching DNS TXT record in network %1$s"),
def->name);
goto cleanup;
}
VIR_FREE(dns->txts[foundIdx].value);
dns->txts[foundIdx].value = g_steal_pointer(&txt.value);
} else {
virNetworkDefUpdateUnknownCommand(command);
goto cleanup;

1
tests/networkxml2xmlupdatein/dns-txt-record-modify-fail.xml Normal file
View File

@ -0,0 +1 @@
<txt name='notexisted' value='modified example'/>

1
tests/networkxml2xmlupdatein/dns-txt-record-modify-success.xml Normal file
View File

@ -0,0 +1 @@
<txt name='example' value='modified example'/>

26
tests/networkxml2xmlupdateout/nat-network-dns-txt-modify-ok.xml Normal file
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@ -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>
<txt name='example' value='modified example'/>
</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>

9
tests/networkxml2xmlupdatetest.c
View File

@ -306,6 +306,15 @@ mymain(void)
"dns-txt-record-snowman",
"nat-network-dns-txt-record",
VIR_NETWORK_UPDATE_COMMAND_DELETE);
DO_TEST("modify-dns-txt-record",
"dns-txt-record-modify-success",
"nat-network-dns-txt-record",
"nat-network-dns-txt-modify-ok",
VIR_NETWORK_UPDATE_COMMAND_MODIFY);
DO_TEST_FAIL("modify-missing-dns-txt-record",
"dns-txt-record-modify-fail",
"nat-network-dns-txt-record",
VIR_NETWORK_UPDATE_COMMAND_MODIFY);
section = VIR_NETWORK_SECTION_DNS_SRV;