A simple DNS proxy server that supports all existing DNS protocols including DNS-over-TLS, DNS-over-HTTPS, DNSCrypt, and DNS-over-QUIC. Moreover, it can work as a DNS-over-HTTPS, DNS-over-TLS or DNS-over-QUIC server.
Note that
DNS-over-QUICsupport is experimental, don't use it in production.
You will need Go v1.19 or later.
$ go build -mod=vendorUsage:
dnsproxy [OPTIONS]
Application Options:
--config-path= yaml configuration file. Minimal working configuration in config.yaml.dist.
Options passed through command line will override the ones from this file.
-v, --verbose Verbose output (optional)
-o, --output= Path to the log file. If not set, write to stdout.
-l, --listen= Listening addresses
-p, --port= Listening ports. Zero value disables TCP and UDP listeners
-s, --https-port= Listening ports for DNS-over-HTTPS
-t, --tls-port= Listening ports for DNS-over-TLS
-q, --quic-port= Listening ports for DNS-over-QUIC
-y, --dnscrypt-port= Listening ports for DNSCrypt
-c, --tls-crt= Path to a file with the certificate chain
-k, --tls-key= Path to a file with the private key
--tls-min-version= Minimum TLS version, for example 1.0
--tls-max-version= Maximum TLS version, for example 1.3
--insecure Disable secure TLS certificate validation
-g, --dnscrypt-config= Path to a file with DNSCrypt configuration. You can generate one using https://github.com/ameshkov/dnscrypt
--http3 Enable HTTP/3 support
-u, --upstream= An upstream to be used (can be specified multiple times).
You can also specify path to a file with the list of servers
-b, --bootstrap= Bootstrap DNS for DoH and DoT, can be specified multiple times (default: 8.8.8.8:53)
-f, --fallback= Fallback resolvers to use when regular ones are unavailable, can be specified multiple times.
You can also specify path to a file with the list of servers
--private-rdns-upstream= Private DNS upstreams to use for reverse DNS lookups of private addresses, can
be specified multiple times
--all-servers If specified, parallel queries to all configured upstream servers are enabled
--fastest-addr Respond to A or AAAA requests only with the fastest IP address
--cache If specified, DNS cache is enabled
--cache-size= Cache size (in bytes). Default: 64k
--cache-min-ttl= Minimum TTL value for DNS entries, in seconds. Capped at 3600.
Artificially extending TTLs should only be done with careful consideration.
--cache-max-ttl= Maximum TTL value for DNS entries, in seconds.
--cache-optimistic If specified, optimistic DNS cache is enabled
-r, --ratelimit= Ratelimit (requests per second)
--refuse-any If specified, refuse ANY requests
--edns Use EDNS Client Subnet extension
--edns-addr= Send EDNS Client Address
--dns64 If specified, dnsproxy will act as a DNS64 server
--dns64-prefix= Prefix used to handle DNS64. If not specified, dnsproxy uses the 'Well-Known Prefix' 64:ff9b::.
Can be specified multiple times
--ipv6-disabled If specified, all AAAA requests will be replied with NoError RCode and empty answer
--bogus-nxdomain= Transform the responses containing at least a single IP that matches specified addresses
and CIDRs into NXDOMAIN. Can be specified multiple times.
--udp-buf-size= Set the size of the UDP buffer in bytes. A value <= 0 will use the system default.
--max-go-routines= Set the maximum number of go routines. A value <= 0 will not not set a maximum.
--pprof If present, exposes pprof information on localhost:6060.
--version Prints the program version
Help Options:
-h, --help Show this help message
Runs a DNS proxy on 0.0.0.0:53 with a single upstream - Google DNS.
./dnsproxy -u 8.8.8.8:53The same proxy with verbose logging enabled writing it to the file log.txt.
./dnsproxy -u 8.8.8.8:53 -v -o log.txtRuns a DNS proxy on 127.0.0.1:5353 with multiple upstreams.
./dnsproxy -l 127.0.0.1 -p 5353 -u 8.8.8.8:53 -u 1.1.1.1:53Listen on multiple interfaces and ports:
./dnsproxy -l 127.0.0.1 -l 192.168.1.10 -p 5353 -p 5354 -u 1.1.1.1The plain DNS upstream server may be specified in several ways:
-
With a plain IP address:
./dnsproxy -l 127.0.0.1 -u 8.8.8.8:53
-
With a hostname or plain IP address and the
udp://scheme:./dnsproxy -l 127.0.0.1 -u udp://dns.google -u udp://1.1.1.1
-
With a hostname or plain IP address and the
tcp://scheme to force using TCP:./dnsproxy -l 127.0.0.1 -u tcp://dns.google -u tcp://1.1.1.1
DNS-over-TLS upstream:
./dnsproxy -u tls://dns.adguard.comDNS-over-HTTPS upstream with specified bootstrap DNS:
./dnsproxy -u https://dns.adguard.com/dns-query -b 1.1.1.1:53DNS-over-QUIC upstream:
./dnsproxy -u quic://dns.adguard.comDNS-over-HTTPS upstream with enabled HTTP/3 support (chooses it if it's faster):
./dnsproxy -u https://dns.google/dns-query --http3DNS-over-HTTPS upstream with forced HTTP/3 (no fallback to other protocol):
./dnsproxy -u h3://dns.google/dns-queryDNSCrypt upstream (DNS Stamp of AdGuard DNS):
./dnsproxy -u sdns://AQIAAAAAAAAAFDE3Ni4xMDMuMTMwLjEzMDo1NDQzINErR_JS3PLCu_iZEIbq95zkSV2LFsigxDIuUso_OQhzIjIuZG5zY3J5cHQuZGVmYXVsdC5uczEuYWRndWFyZC5jb20DNS-over-HTTPS upstream (DNS Stamp of Cloudflare DNS):
./dnsproxy -u sdns://AgcAAAAAAAAABzEuMC4wLjGgENk8mGSlIfMGXMOlIlCcKvq7AVgcrZxtjon911-ep0cg63Ul-I8NlFj4GplQGb_TTLiczclX57DvMV8Q-JdjgRgSZG5zLmNsb3VkZmxhcmUuY29tCi9kbnMtcXVlcnkDNS-over-TLS upstream with two fallback servers (to be used when the main upstream is not available):
./dnsproxy -u tls://dns.adguard.com -f 8.8.8.8:53 -f 1.1.1.1:53Runs a DNS-over-TLS proxy on 127.0.0.1:853.
./dnsproxy -l 127.0.0.1 --tls-port=853 --tls-crt=example.crt --tls-key=example.key -u 8.8.8.8:53 -p 0Runs a DNS-over-HTTPS proxy on 127.0.0.1:443.
./dnsproxy -l 127.0.0.1 --https-port=443 --tls-crt=example.crt --tls-key=example.key -u 8.8.8.8:53 -p 0Runs a DNS-over-HTTPS proxy on 127.0.0.1:443 with HTTP/3 support.
./dnsproxy -l 127.0.0.1 --https-port=443 --http3 --tls-crt=example.crt --tls-key=example.key -u 8.8.8.8:53 -p 0Runs a DNS-over-QUIC proxy on 127.0.0.1:853.
./dnsproxy -l 127.0.0.1 --quic-port=853 --tls-crt=example.crt --tls-key=example.key -u 8.8.8.8:53 -p 0Runs a DNSCrypt proxy on 127.0.0.1:443.
./dnsproxy -l 127.0.0.1 --dnscrypt-config=./dnscrypt-config.yaml --dnscrypt-port=443 --upstream=8.8.8.8:53 -p 0Please note that in order to run a DNSCrypt proxy, you need to obtain DNSCrypt configuration first. You can use https://github.com/ameshkov/dnscrypt command-line tool to do that with a command like this
./dnscrypt generate --provider-name=2.dnscrypt-cert.example.org --out=dnscrypt-config.yaml
Runs a DNS proxy on 0.0.0.0:53 with rate limit set to 10 rps, enabled DNS cache, and that refuses type=ANY requests.
./dnsproxy -u 8.8.8.8:53 -r 10 --cache --refuse-anyRuns a DNS proxy on 127.0.0.1:5353 with multiple upstreams and enable parallel queries to all configured upstream servers.
./dnsproxy -l 127.0.0.1 -p 5353 -u 8.8.8.8:53 -u 1.1.1.1:53 -u tls://dns.adguard.com --all-serversLoads upstreams list from a file.
./dnsproxy -l 127.0.0.1 -p 5353 -u ./upstreams.txtdnsproxy is capable of working as a DNS64 server.
What is DNS64/NAT64 This is a mechanism of providing IPv6 access to IPv4. Using a NAT64 gateway with IPv4-IPv6 translation capability lets IPv6-only clients connect to IPv4-only services via synthetic IPv6 addresses starting with a prefix that routes them to the NAT64 gateway. DNS64 is a DNS service that returns AAAA records with these synthetic IPv6 addresses for IPv4-only destinations (with A but not AAAA records in the DNS). This lets IPv6-only clients use NAT64 gateways without any other configuration.
See also RFC 6147.
Enables DNS64 with the default Well-Known Prefix:
./dnsproxy -l 127.0.0.1 -p 5353 -u 8.8.8.8 --private-rdns-upstream=127.0.0.1 --dns64You can also specify any number of custom DNS64 prefixes:
./dnsproxy -l 127.0.0.1 -p 5353 -u 8.8.8.8 --private-rdns-upstream=127.0.0.1 --dns64 --dns64-prefix=64:ffff:: --dns64-prefix=32:ffff::Note that only the first specified prefix will be used for synthesis.
PTR queries for addresses within the specified ranges or the Well-Known one could only be answered with locally appropriate data, so dnsproxy will route those to the local upstream servers. Those should be specified if DNS64 is enabled.
This option would be useful to the users with problematic network connection.
In this mode, dnsproxy would detect the fastest IP address among all that were returned,
and it will return only it.
Additionally, for those with problematic network connection, it makes sense to override cache-min-ttl.
In this case, dnsproxy will make sure that DNS responses are cached for at least the specified amount of time.
It makes sense to run it with multiple upstream servers only.
Run a DNS proxy with two upstreams, min-TTL set to 10 minutes, fastest address detection is enabled:
./dnsproxy -u 8.8.8.8 -u 1.1.1.1 --cache --cache-min-ttl=600 --fastest-addr
who run dnsproxy with multiple upstreams
You can specify upstreams that will be used for a specific domain(s). We use the dnsmasq-like syntax (see --server description here).
Syntax: [/[domain1][/../domainN]/]upstreamString
If one or more domains are specified, that upstream (upstreamString) is used only for those domains. Usually, it is used for private nameservers. For instance, if you have a nameserver on your network which deals with xxx.internal.local at 192.168.0.1 then you can specify [/internal.local/]192.168.0.1, and dnsproxy will send all queries to that nameserver. Everything else will be sent to the default upstreams (which are mandatory!).
- An empty domain specification, // has the special meaning of "unqualified names only" ie names without any dots in them.
- More specific domains take precedence over less specific domains, so:
--upstream=[/host.com/]1.2.3.4 --upstream=[/www.host.com/]2.3.4.5will send queries for *.host.com to 1.2.3.4, except *.www.host.com, which will go to 2.3.4.5 - The special server address
#means, "use the standard servers", so:--upstream=[/host.com/]1.2.3.4 --upstream=[/www.host.com/]#will send queries for *.host.com to 1.2.3.4, except *.www.host.com which will be forwarded as usual. - The wildcard
*has special meaning of "any sub-domain", so:--upstream=[/*.host.com/]1.2.3.4will send queries for *.host.com to 1.2.3.4, but host.com will be forwarded to default upstreams.
Examples
Sends queries for *.local domains to 192.168.0.1:53. Other queries are sent to 8.8.8.8:53.
./dnsproxy -u 8.8.8.8:53 -u [/local/]192.168.0.1:53
Sends queries for *.host.com to 1.1.1.1:53 except for *.maps.host.com which are sent to 8.8.8.8:53 (along with other queries).
./dnsproxy -u 8.8.8.8:53 -u [/host.com/]1.1.1.1:53 -u [/maps.host.com/]#
Sends queries for *.host.com to 1.1.1.1:53 except for host.com which is sent to 8.8.8.8:53 (along with other queries).
./dnsproxy -u 8.8.8.8:53 -u [/*.host.com/]1.1.1.1:53
To enable support for EDNS Client Subnet extension you should run dnsproxy with --edns flag:
./dnsproxy -u 8.8.8.8:53 --edns
Now if you connect to the proxy from the Internet - it will pass through your original IP address's prefix to the upstream server. This way the upstream server may respond with IP addresses of the servers that are located near you to minimize latency.
If you want to use EDNS CS feature when you're connecting to the proxy from a local network, you need to set --edns-addr=PUBLIC_IP argument:
./dnsproxy -u 8.8.8.8:53 --edns --edns-addr=72.72.72.72
Now even if your IP address is 192.168.0.1 and it's not a public IP, the proxy will pass through 72.72.72.72 to the upstream server.
This option is similar to dnsmasq bogus-nxdomain. dnsproxy will transform
responses that contain at least a single IP address which is also specified by
the option into NXDOMAIN. Can be specified multiple times.
In the example below, we use AdGuard DNS server that returns 0.0.0.0 for
blocked domains, and transform them to NXDOMAIN.
./dnsproxy -u 94.140.14.14:53 --bogus-nxdomain=0.0.0.0
CIDR ranges are supported as well. The following will respond with NXDOMAIN
instead of responses containing any IP from 192.168.0.0-192.168.255.255:
./dnsproxy -u 192.168.0.15:53 --bogus-nxdomain=192.168.0.0/16