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[nat64] support using IPv4 DNS server addresses in CLI (#8212)

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Similar to TCP/UDP/PING commands, this command will print "Synthesized
IPv6 DNS server address:" when an IPv4 address is received.
This commit is contained in:
Song GUO
2022-09-30 08:29:44 -07:00
committed by GitHub
parent f6df50cde6
commit 7954c34231
2 changed files with 24 additions and 2 deletions
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src/cli/README.md
+15
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@@ -1063,6 +1063,17 @@ The parameters after `hostname` are optional. Any unspecified (or zero) value fo
> DNS response for ipv6.google.com - 2a00:1450:401b:801:0:0:0:200e TTL: 300
```
The DNS server IP can be an IPv4 address, which will be synthesized to an IPv6 address using the preferred NAT64 prefix from the network data.
> Note: The command will return `InvalidState` when the DNS server IP is an IPv4 address but the preferred NAT64 prefix is unavailable.
```bash
> dns resolve example.com 8.8.8.8
Synthesized IPv6 DNS server address: fdde:ad00:beef:2:0:0:808:808
DNS response for example.com. - fd4c:9574:3720:2:0:0:5db8:d822 TTL:20456
Done
```
### dns browse \<service-name\> \[DNS server IP\] \[DNS server port\] \[response timeout (ms)\] \[max tx attempts\] \[recursion desired (boolean)\]
Send a browse (service instance enumeration) DNS query to get the list of services for given service-name.
@@ -1085,12 +1096,16 @@ instance2
Done
```
> Note: The DNS server IP can be an IPv4 address, which will be synthesized to an IPv6 address using the preferred NAT64 prefix from the network data. The command will return `InvalidState` when the DNS server IP is an IPv4 address but the preferred NAT64 prefix is unavailable.
### dns service \<service-instance-label\> \<service-name\> \[DNS server IP\] \[DNS server port\] \[response timeout (ms)\] \[max tx attempts\] \[recursion desired (boolean)\]
Send a service instance resolution DNS query for a given service instance. Service instance label is provided first, followed by the service name (note that service instance label can contain dot '.' character).
The parameters after `service-name` are optional. Any unspecified (or zero) value for these optional parameters is replaced by the value from the current default config (`dns config`).
> Note: The DNS server IP can be an IPv4 address, which will be synthesized to an IPv6 address using the preferred NAT64 prefix from the network data. The command will return `InvalidState` when the DNS server IP is an IPv4 address but the preferred NAT64 prefix is unavailable.
### dns compression \[enable|disable\]
Enable/Disable the "DNS name compression" mode.
src/cli/cli.cpp
+9 -2
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@@ -2945,17 +2945,24 @@ exit:
otError Interpreter::GetDnsConfig(Arg aArgs[], otDnsQueryConfig *&aConfig)
{
// This method gets the optional DNS config from `aArgs[]`.
// The format: `[server IPv6 address] [server port] [timeout]
// The format: `[server IP address] [server port] [timeout]
// [max tx attempt] [recursion desired]`.
otError error = OT_ERROR_NONE;
bool recursionDesired;
bool nat64SynthesizedAddress;
memset(aConfig, 0, sizeof(otDnsQueryConfig));
VerifyOrExit(!aArgs[0].IsEmpty(), aConfig = nullptr);
SuccessOrExit(error = aArgs[0].ParseAsIp6Address(aConfig->mServerSockAddr.mAddress));
SuccessOrExit(error = Interpreter::ParseToIp6Address(GetInstancePtr(), aArgs[0], aConfig->mServerSockAddr.mAddress,
nat64SynthesizedAddress));
if (nat64SynthesizedAddress)
{
OutputFormat("Synthesized IPv6 DNS server address: ");
OutputIp6AddressLine(aConfig->mServerSockAddr.mAddress);
}
VerifyOrExit(!aArgs[1].IsEmpty());
SuccessOrExit(error = aArgs[1].ParseAsUint16(aConfig->mServerSockAddr.mPort));