diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
new file mode 100644
index 0000000..8eaaab8
--- /dev/null
+++ b/.github/workflows/ci.yml
@@ -0,0 +1,26 @@
+on:
+  push:
+    branches: [main]
+  pull_request:
+
+jobs:
+  test:
+    strategy:
+      fail-fast: false
+      matrix:
+        os: ["windows-latest", "ubuntu-latest", "macOS-latest"]
+        go: ["1.19.x"]
+    runs-on: ${{ matrix.os }}
+    steps:
+      - uses: actions/checkout@v1
+        with:
+          fetch-depth: 1
+      - uses: WillAbides/setup-go-faster@v1.7.0
+        with:
+          go-version: ${{ matrix.go }}
+      - run: "go test -race ./..."
+      - uses: dominikh/staticcheck-action@v1.2.0
+        with:
+          version: "2022.1.1"
+          install-go: false
+          cache-key: ${{ matrix.go }}
diff --git a/README.md b/README.md
index 92fea08..7e53170 100644
--- a/README.md
+++ b/README.md
@@ -1,2 +1,132 @@
 # ctrld
-A highly configurable, multi-protocol DNS forwarding proxy
+A highly configurable DNS forwarding proxy with support for:
+- Multiple listeners for incoming queries
+- Multiple upstreams with fallbacks
+- Multiple network policy driven DNS query steering
+- Policy driven domain based "split horizon" DNS with wildcard support
+
+All DNS protocols are supported, including:
+- `UDP 53`
+- `DNS-over-HTTPS`
+- `DNS-over-TLS`
+- `DNS-over-HTTP/3` (DOH3)
+- `DNS-over-QUIC`
+
+## Use Cases
+1. Use secure DNS protocols on networks and devices that don't natively support them (legacy routers, legacy OSes, TVs, smart toasters).
+2. Create source IP based DNS routing policies with variable secure DNS upstreams. Subnet 1 (admin) uses upstream resolver A, while Subnet 2 (employee) uses upstream resolver B.
+3. Create destination IP based DNS routing policies with variable secure DNS upstreams. Listener 1 uses upstream resolver C, while Listener 2 uses upstream resolver D. 
+4. Create domain level "split horizon" DNS routing policies to send internal domains (*.company.int) to a local DNS server, while everything else goes to another upstream.
+
+
+## OS Support
+- Windows (386, amd64, arm)
+- Mac (amd64, arm)
+- Linux (386, amd64, arm, mips)
+
+## Download
+Download pre-compiled binaries from the [Releases](#) section.
+
+## Build
+`ctrld` requires `go1.19+`:
+
+```shell
+$ go build
+```
+
+or 
+
+```shell
+$ go install <path_to_repo>
+```
+
+## Arguments
+```
+Usage:
+  ctrld [command]
+
+Available Commands:
+  help        Help about any command
+  interfaces  Manage Interface DNS settings
+  run         Run the DNS proxy server
+
+Flags:
+  -h, --help      help for ctrld
+  -j, --json      json output
+  -v, --verbose   verbose log output
+      --version   version for ctrld
+
+Use "ctrld [command] --help" for more information about a command.
+```
+## Usage
+To start the server with default configuration, simply run: `ctrld run`. This will create a generic `config.toml` file in the working directory and start the service. 
+1. Start the server
+  ```
+  $ sudo ./ctrld run
+  ```
+
+2. Run a test query using a DNS client, for example, `dig`:
+  ```
+  $ dig verify.controld.com @127.0.0.1 +short
+  api.controld.com.
+  147.185.34.1
+  ```
+
+If `verify.controld.com` resolves, you're successfully using the default Control D upstream.
+
+
+## Configuration
+### Example 
+- Start `listener.0` on 127.0.0.1:53
+- Accept queries from any source address
+- Send all queries to `upstream.0` via DoH protocol
+
+### Default Config
+```toml                                               
+[listener]
+
+  [listener.0]
+    ip = "127.0.0.1"
+    port = 53
+    restricted = false
+
+[network]
+
+  [network.0]
+    cidrs = ["0.0.0.0/0"]
+    name = "Network 0"
+
+[service]
+  log_level = "info"
+  log_path = ""
+
+[upstream]
+
+  [upstream.0]
+    bootstrap_ip = "76.76.2.11"
+    endpoint = "https://freedns.controld.com/p1"
+    name = "Control D - Anti-Malware"
+    timeout = 5000
+    type = "doh"
+
+  [upstream.1]
+    bootstrap_ip = "76.76.2.11"
+    endpoint = "p2.freedns.controld.com"
+    name = "Control D - No Ads"
+    timeout = 3000
+    type = "doq"
+
+```
+
+### Advanced 
+The above is the most basic example, which will work out of the box. If you're looking to do advanced configurations using policies, see [Configuration Docs](docs/config.md) for complete documentation of the config file. 
+
+## Contributing
+
+See [Contribution Guideline](./docs/contributing.md)
+
+## Roadmap
+The following functionality is on the roadmap and will be available in future releases. 
+- Prometheus metrics exporter 
+- Local caching
+- Service self-installation 
diff --git a/cmd/ctrld/cli.go b/cmd/ctrld/cli.go
new file mode 100644
index 0000000..f431500
--- /dev/null
+++ b/cmd/ctrld/cli.go
@@ -0,0 +1,116 @@
+package main
+
+import (
+	"fmt"
+	"log"
+	"os"
+	"os/exec"
+	"runtime"
+
+	"github.com/kardianos/service"
+	"github.com/pelletier/go-toml"
+	"github.com/spf13/cobra"
+	"github.com/spf13/viper"
+)
+
+var (
+	v                    = viper.NewWithOptions(viper.KeyDelimiter("::"))
+	defaultConfigWritten = false
+)
+
+func initCLI() {
+	// Enable opening via explorer.exe on Windows.
+	// See: https://github.com/spf13/cobra/issues/844.
+	cobra.MousetrapHelpText = ""
+
+	rootCmd := &cobra.Command{
+		Use:     "ctrld",
+		Short:   "Running Control-D DNS proxy server",
+		Version: "1.0.0",
+	}
+	rootCmd.PersistentFlags().BoolVarP(&verbose, "verbose", "v", false, "verbose log output")
+
+	runCmd := &cobra.Command{
+		Use:   "run",
+		Short: "Run the DNS proxy server",
+		Args:  cobra.NoArgs,
+		Run: func(cmd *cobra.Command, args []string) {
+			if daemon && runtime.GOOS == "windows" {
+				log.Fatal("Cannot run in daemon mode. Please install a Windows service.")
+			}
+			if configPath != "" {
+				v.SetConfigFile(configPath)
+			}
+			if err := v.ReadInConfig(); err != nil {
+				if _, ok := err.(viper.ConfigFileNotFoundError); ok {
+					writeConfigFile()
+					defaultConfigWritten = true
+				} else {
+					log.Fatalf("failed to decode config file: %v", err)
+				}
+			}
+			if err := v.Unmarshal(&cfg); err != nil {
+				log.Fatalf("failed to unmarshal config: %v", err)
+			}
+			initLogging()
+			if daemon {
+				exe, err := os.Executable()
+				if err != nil {
+					mainLog.Error().Err(err).Msg("failed to find the binary")
+					os.Exit(1)
+				}
+				curDir, err := os.Getwd()
+				if err != nil {
+					mainLog.Error().Err(err).Msg("failed to get current working directory")
+					os.Exit(1)
+				}
+				// If running as daemon, re-run the command in background, with daemon off.
+				cmd := exec.Command(exe, append(os.Args[1:], "-d=false")...)
+				cmd.Dir = curDir
+				if err := cmd.Start(); err != nil {
+					mainLog.Error().Err(err).Msg("failed to start process as daemon")
+					os.Exit(1)
+				}
+				mainLog.Info().Int("pid", cmd.Process.Pid).Msg("DNS proxy started")
+				os.Exit(0)
+			}
+
+			s, err := service.New(&prog{}, svcConfig)
+			if err != nil {
+				mainLog.Fatal().Err(err).Msg("failed create new service")
+			}
+			serviceLogger, err := s.Logger(nil)
+			if err != nil {
+				mainLog.Error().Err(err).Msg("failed to get service logger")
+				return
+			}
+
+			if err := s.Run(); err != nil {
+				if sErr := serviceLogger.Error(err); sErr != nil {
+					mainLog.Error().Err(sErr).Msg("failed to write service log")
+				}
+				mainLog.Error().Err(err).Msg("failed to start service")
+			}
+		},
+	}
+	runCmd.Flags().BoolVarP(&daemon, "daemon", "d", false, "Run as daemon")
+	runCmd.Flags().StringVarP(&configPath, "config", "c", "", "Path to config file")
+
+	rootCmd.AddCommand(runCmd)
+
+	if err := rootCmd.Execute(); err != nil {
+		fmt.Println(err)
+		os.Exit(1)
+	}
+}
+
+func writeConfigFile() {
+	c := v.AllSettings()
+	bs, err := toml.Marshal(c)
+	if err != nil {
+		log.Fatalf("unable to marshal config to toml: %v", err)
+	}
+	if err := os.WriteFile("config.toml", bs, 0600); err != nil {
+		log.Printf("failed to write config file: %v\n", err)
+	}
+}
diff --git a/cmd/ctrld/dns_proxy.go b/cmd/ctrld/dns_proxy.go
new file mode 100644
index 0000000..06378bb
--- /dev/null
+++ b/cmd/ctrld/dns_proxy.go
@@ -0,0 +1,215 @@
+package main
+
+import (
+	"context"
+	"crypto/rand"
+	"encoding/hex"
+	"fmt"
+	"net"
+	"strconv"
+	"strings"
+	"time"
+
+	"github.com/miekg/dns"
+
+	"github.com/Control-D-Inc/ctrld"
+)
+
+func (p *prog) serveUDP(listenerNum string) error {
+	listenerConfig := p.cfg.Listener[listenerNum]
+	// make sure ip is allocated
+	if allocErr := p.allocateIP(listenerConfig.IP); allocErr != nil {
+		mainLog.Error().Err(allocErr).Str("ip", listenerConfig.IP).Msg("serveUDP: failed to allocate listen ip")
+		return allocErr
+	}
+
+	handler := dns.HandlerFunc(func(w dns.ResponseWriter, m *dns.Msg) {
+		domain := canonicalName(m.Question[0].Name)
+		reqId := requestID()
+		fmtSrcToDest := fmtRemoteToLocal(listenerNum, w.RemoteAddr().String(), w.LocalAddr().String())
+		t := time.Now()
+		ctx := context.WithValue(context.Background(), ctrld.ReqIdCtxKey{}, reqId)
+		ctrld.Log(ctx, proxyLog.Debug(), "%s received query: %s", fmtSrcToDest, domain)
+		upstreams, matched := p.upstreamFor(ctx, listenerNum, listenerConfig, w.RemoteAddr(), domain)
+		var answer *dns.Msg
+		if !matched && listenerConfig.Restricted {
+			answer = new(dns.Msg)
+			answer.SetRcode(m, dns.RcodeRefused)
+
+		} else {
+			answer = p.proxy(ctx, upstreams, m)
+			rtt := time.Since(t)
+			ctrld.Log(ctx, proxyLog.Debug(), "received response of %d bytes in %s", answer.Len(), rtt)
+		}
+		if err := w.WriteMsg(answer); err != nil {
+			ctrld.Log(ctx, mainLog.Error().Err(err), "serveUDP: failed to send DNS response to client")
+		}
+	})
+	s := &dns.Server{
+		Addr:    net.JoinHostPort(listenerConfig.IP, strconv.Itoa(listenerConfig.Port)),
+		Net:     "udp",
+		Handler: handler,
+	}
+	return s.ListenAndServe()
+}
+
+func (p *prog) upstreamFor(ctx context.Context, defaultUpstreamNum string, lc *ctrld.ListenerConfig, addr net.Addr, domain string) ([]string, bool) {
+	upstreams := []string{"upstream." + defaultUpstreamNum}
+	matchedPolicy := "no policy"
+	matchedNetwork := "no network"
+	matchedRule := "no rule"
+	matched := false
+
+	defer func() {
+		if !matched && lc.Restricted {
+			ctrld.Log(ctx, proxyLog.Info(), "query refused, %s does not match any network policy", addr.String())
+			return
+		}
+		ctrld.Log(ctx, proxyLog.Info(), "%s, %s, %s -> %v", matchedPolicy, matchedNetwork, matchedRule, upstreams)
+	}()
+
+	if lc.Policy == nil {
+		return upstreams, false
+	}
+
+	do := func(policyUpstreams []string) {
+		upstreams = append([]string(nil), policyUpstreams...)
+	}
+
+	for _, rule := range lc.Policy.Rules {
+		// There's only one entry per rule, config validation ensures this.
+		for source, targets := range rule {
+			if source == domain || wildcardMatches(source, domain) {
+				matchedPolicy = lc.Policy.Name
+				matchedRule = source
+				do(targets)
+				matched = true
+				return upstreams, matched
+			}
+		}
+	}
+
+	var sourceIP net.IP
+	switch addr := addr.(type) {
+	case *net.UDPAddr:
+		sourceIP = addr.IP
+	case *net.TCPAddr:
+		sourceIP = addr.IP
+	}
+	for _, rule := range lc.Policy.Networks {
+		for source, targets := range rule {
+			networkNum := strings.TrimPrefix(source, "network.")
+			nc := p.cfg.Network[networkNum]
+			if nc == nil {
+				continue
+			}
+
+			for _, ipNet := range nc.IPNets {
+				if ipNet.Contains(sourceIP) {
+					matchedPolicy = lc.Policy.Name
+					matchedNetwork = source
+					do(targets)
+					matched = true
+					return upstreams, matched
+				}
+			}
+		}
+	}
+
+	return upstreams, matched
+}
+
+func (p *prog) proxy(ctx context.Context, upstreams []string, msg *dns.Msg) *dns.Msg {
+	upstreamConfigs := p.upstreamConfigsFromUpstreamNumbers(upstreams)
+	resolve := func(n int, upstreamConfig *ctrld.UpstreamConfig, msg *dns.Msg) *dns.Msg {
+		ctrld.Log(ctx, proxyLog.Debug(), "sending query to %s: %s", upstreams[n], upstreamConfig.Name)
+		dnsResolver, err := ctrld.NewResolver(upstreamConfig)
+		if err != nil {
+			ctrld.Log(ctx, proxyLog.Error().Err(err), "failed to create resolver")
+			return nil
+		}
+		if upstreamConfig.Timeout > 0 {
+			timeoutCtx, cancel := context.WithTimeout(ctx, time.Millisecond*time.Duration(upstreamConfig.Timeout))
+			defer cancel()
+			ctx = timeoutCtx
+		}
+		answer, err := dnsResolver.Resolve(ctx, msg)
+		if err != nil {
+			ctrld.Log(ctx, proxyLog.Error().Err(err), "failed to resolve query")
+			return nil
+		}
+		return answer
+	}
+	for n, upstreamConfig := range upstreamConfigs {
+		if answer := resolve(n, upstreamConfig, msg); answer != nil {
+			return answer
+		}
+	}
+	ctrld.Log(ctx, proxyLog.Error(), "all upstreams failed")
+	answer := new(dns.Msg)
+	answer.SetRcode(msg, dns.RcodeServerFailure)
+	return answer
+}
+
+// canonicalName returns canonical name from FQDN with "." trimmed.
+func canonicalName(fqdn string) string {
+	q := strings.TrimSpace(fqdn)
+	q = strings.TrimSuffix(q, ".")
+	// https://datatracker.ietf.org/doc/html/rfc4343
+	q = strings.ToLower(q)
+
+	return q
+}
+
+func wildcardMatches(wildcard, domain string) bool {
+	// Wildcard match.
+	wildCardParts := strings.Split(wildcard, "*")
+	if len(wildCardParts) != 2 {
+		return false
+	}
+
+	switch {
+	case len(wildCardParts[0]) > 0 && len(wildCardParts[1]) > 0:
+		// Domain must match both prefix and suffix.
+		return strings.HasPrefix(domain, wildCardParts[0]) && strings.HasSuffix(domain, wildCardParts[1])
+
+	case len(wildCardParts[1]) > 0:
+		// Only suffix must match.
+		return strings.HasSuffix(domain, wildCardParts[1])
+
+	case len(wildCardParts[0]) > 0:
+		// Only prefix must match.
+		return strings.HasPrefix(domain, wildCardParts[0])
+	}
+
+	return false
+}
+
+func fmtRemoteToLocal(listenerNum, remote, local string) string {
+	return fmt.Sprintf("%s -> listener.%s: %s:", remote, listenerNum, local)
+}
+
+func (p *prog) upstreamConfigsFromUpstreamNumbers(upstreams []string) []*ctrld.UpstreamConfig {
+	upstreamConfigs := make([]*ctrld.UpstreamConfig, 0, len(upstreams))
+	for _, upstream := range upstreams {
+		upstreamNum := strings.TrimPrefix(upstream, "upstream.")
+		upstreamConfigs = append(upstreamConfigs, p.cfg.Upstream[upstreamNum])
+	}
+	if len(upstreamConfigs) == 0 {
+		upstreamConfigs = []*ctrld.UpstreamConfig{osUpstreamConfig}
+	}
+	return upstreamConfigs
+}
+
+func requestID() string {
+	b := make([]byte, 3) // 6 chars
+	if _, err := rand.Read(b); err != nil {
+		panic(err)
+	}
+	return hex.EncodeToString(b)
+}
+
+var osUpstreamConfig = &ctrld.UpstreamConfig{
+	Name: "OS resolver",
+	Type: "os",
+}
diff --git a/cmd/ctrld/dns_proxy_test.go b/cmd/ctrld/dns_proxy_test.go
new file mode 100644
index 0000000..8435f7d
--- /dev/null
+++ b/cmd/ctrld/dns_proxy_test.go
@@ -0,0 +1,117 @@
+package main
+
+import (
+	"context"
+	"net"
+	"testing"
+
+	"github.com/stretchr/testify/assert"
+	"github.com/stretchr/testify/require"
+
+	"github.com/Control-D-Inc/ctrld"
+	"github.com/Control-D-Inc/ctrld/testhelper"
+)
+
+func Test_wildcardMatches(t *testing.T) {
+	tests := []struct {
+		name     string
+		wildcard string
+		domain   string
+		match    bool
+	}{
+		{"prefix parent should not match", "*.windscribe.com", "windscribe.com", false},
+		{"prefix", "*.windscribe.com", "anything.windscribe.com", true},
+		{"prefix not match other domain", "*.windscribe.com", "example.com", false},
+		{"prefix not match domain in name", "*.windscribe.com", "wwindscribe.com", false},
+		{"suffix", "suffix.*", "suffix.windscribe.com", true},
+		{"suffix not match other", "suffix.*", "suffix1.windscribe.com", false},
+		{"both", "suffix.*.windscribe.com", "suffix.anything.windscribe.com", true},
+		{"both not match", "suffix.*.windscribe.com", "suffix1.suffix.windscribe.com", false},
+	}
+
+	for _, tc := range tests {
+		tc := tc
+		t.Run(tc.name, func(t *testing.T) {
+			t.Parallel()
+			if got := wildcardMatches(tc.wildcard, tc.domain); got != tc.match {
+				t.Errorf("unexpected result, wildcard: %s, domain: %s, want: %v, got: %v", tc.wildcard, tc.domain, tc.match, got)
+			}
+		})
+	}
+}
+
+func Test_canonicalName(t *testing.T) {
+	tests := []struct {
+		name      string
+		domain    string
+		canonical string
+	}{
+		{"fqdn to canonical", "windscribe.com.", "windscribe.com"},
+		{"already canonical", "windscribe.com", "windscribe.com"},
+		{"case insensitive", "Windscribe.Com.", "windscribe.com"},
+	}
+
+	for _, tc := range tests {
+		tc := tc
+		t.Run(tc.name, func(t *testing.T) {
+			t.Parallel()
+			if got := canonicalName(tc.domain); got != tc.canonical {
+				t.Errorf("unexpected result, want: %s, got: %s", tc.canonical, got)
+			}
+		})
+	}
+}
+
+func Test_prog_upstreamFor(t *testing.T) {
+	cfg := testhelper.SampleConfig(t)
+	prog := &prog{cfg: cfg}
+	for _, nc := range prog.cfg.Network {
+		for _, cidr := range nc.Cidrs {
+			_, ipNet, err := net.ParseCIDR(cidr)
+			if err != nil {
+				t.Fatal(err)
+			}
+			nc.IPNets = append(nc.IPNets, ipNet)
+		}
+	}
+
+	tests := []struct {
+		name               string
+		ip                 string
+		defaultUpstreamNum string
+		lc                 *ctrld.ListenerConfig
+		domain             string
+		upstreams          []string
+		matched            bool
+	}{
+		{"Policy map matches", "192.168.0.1:0", "0", prog.cfg.Listener["0"], "abc.xyz", []string{"upstream.1", "upstream.0"}, true},
+		{"Policy split matches", "192.168.0.1:0", "0", prog.cfg.Listener["0"], "abc.ru", []string{"upstream.1"}, true},
+		{"Policy map for other network matches", "192.168.1.2:0", "0", prog.cfg.Listener["0"], "abc.xyz", []string{"upstream.0"}, true},
+		{"No policy map for listener", "192.168.1.2:0", "1", prog.cfg.Listener["1"], "abc.ru", []string{"upstream.1"}, false},
+	}
+
+	for _, tc := range tests {
+		tc := tc
+		t.Run(tc.name, func(t *testing.T) {
+			t.Parallel()
+			for _, network := range []string{"udp", "tcp"} {
+				var (
+					addr net.Addr
+					err  error
+				)
+				switch network {
+				case "udp":
+					addr, err = net.ResolveUDPAddr(network, tc.ip)
+				case "tcp":
+					addr, err = net.ResolveTCPAddr(network, tc.ip)
+				}
+				require.NoError(t, err)
+				require.NotNil(t, addr)
+				ctx := context.WithValue(context.Background(), ctrld.ReqIdCtxKey{}, requestID())
+				upstreams, matched := prog.upstreamFor(ctx, tc.defaultUpstreamNum, tc.lc, addr, tc.domain)
+				assert.Equal(t, tc.matched, matched)
+				assert.Equal(t, tc.upstreams, upstreams)
+			}
+		})
+	}
+}
diff --git a/cmd/ctrld/main.go b/cmd/ctrld/main.go
new file mode 100644
index 0000000..7b539eb
--- /dev/null
+++ b/cmd/ctrld/main.go
@@ -0,0 +1,65 @@
+package main
+
+import (
+	"fmt"
+	"io"
+	"os"
+	"time"
+
+	"github.com/rs/zerolog"
+
+	"github.com/Control-D-Inc/ctrld"
+)
+
+var (
+	configPath string
+	daemon     bool
+	cfg        ctrld.Config
+	verbose    bool
+
+	bootstrapDNS = "76.76.2.0"
+
+	rootLogger = zerolog.New(io.Discard)
+	mainLog    = rootLogger
+	proxyLog   = rootLogger
+)
+
+func main() {
+	ctrld.InitConfig(v, "config")
+	initCLI()
+}
+
+func initLogging() {
+	writers := []io.Writer{io.Discard}
+	isLog := cfg.Service.LogLevel != ""
+	if logPath := cfg.Service.LogPath; logPath != "" {
+		logFile, err := os.OpenFile(logPath, os.O_APPEND|os.O_CREATE|os.O_RDWR, 0600)
+		if err != nil {
+			fmt.Fprintf(os.Stderr, "failed to creating log file: %v", err)
+			os.Exit(1)
+		}
+		isLog = true
+		writers = append(writers, logFile)
+	}
+	zerolog.TimeFieldFormat = zerolog.TimeFormatUnixMs
+	if verbose || isLog {
+		consoleWriter := zerolog.NewConsoleWriter(func(w *zerolog.ConsoleWriter) {
+			w.TimeFormat = time.StampMilli
+		})
+		writers = append(writers, consoleWriter)
+		multi := zerolog.MultiLevelWriter(writers...)
+		mainLog = mainLog.Output(multi).With().Timestamp().Str("prefix", "main").Logger()
+		proxyLog = proxyLog.Output(multi).With().Timestamp().Logger()
+		// TODO: find a better way.
+		ctrld.ProxyLog = proxyLog
+	}
+	if cfg.Service.LogLevel == "" {
+		return
+	}
+	level, err := zerolog.ParseLevel(cfg.Service.LogLevel)
+	if err != nil {
+		mainLog.Warn().Err(err).Msg("could not set log level")
+		return
+	}
+	zerolog.SetGlobalLevel(level)
+}
diff --git a/cmd/ctrld/os_linux.go b/cmd/ctrld/os_linux.go
new file mode 100644
index 0000000..6d952c9
--- /dev/null
+++ b/cmd/ctrld/os_linux.go
@@ -0,0 +1,25 @@
+package main
+
+import (
+	"os/exec"
+)
+
+// allocate loopback ip
+// sudo ip a add 127.0.0.2/24 dev lo
+func allocateIP(ip string) error {
+	cmd := exec.Command("ip", "a", "add", ip+"/24", "dev", "lo")
+	if err := cmd.Run(); err != nil {
+		mainLog.Error().Err(err).Msg("allocateIP failed")
+		return err
+	}
+	return nil
+}
+
+func deAllocateIP(ip string) error {
+	cmd := exec.Command("ip", "a", "del", ip+"/24", "dev", "lo")
+	if err := cmd.Run(); err != nil {
+		mainLog.Error().Err(err).Msg("deAllocateIP failed")
+		return err
+	}
+	return nil
+}
diff --git a/cmd/ctrld/os_mac.go b/cmd/ctrld/os_mac.go
new file mode 100644
index 0000000..b635ea5
--- /dev/null
+++ b/cmd/ctrld/os_mac.go
@@ -0,0 +1,28 @@
+//go:build darwin
+// +build darwin
+
+package main
+
+import (
+	"os/exec"
+)
+
+// allocate loopback ip
+// sudo ifconfig lo0 alias 127.0.0.2 up
+func allocateIP(ip string) error {
+	cmd := exec.Command("ifconfig", "lo0", "alias", ip, "up")
+	if err := cmd.Run(); err != nil {
+		mainLog.Error().Err(err).Msg("allocateIP failed")
+		return err
+	}
+	return nil
+}
+
+func deAllocateIP(ip string) error {
+	cmd := exec.Command("ifconfig", "lo0", "-alias", ip)
+	if err := cmd.Run(); err != nil {
+		mainLog.Error().Err(err).Msg("deAllocateIP failed")
+		return err
+	}
+	return nil
+}
diff --git a/cmd/ctrld/os_windows.go b/cmd/ctrld/os_windows.go
new file mode 100644
index 0000000..e7c2c56
--- /dev/null
+++ b/cmd/ctrld/os_windows.go
@@ -0,0 +1,14 @@
+//go:build windows
+// +build windows
+
+package main
+
+// TODO(cuonglm): implement.
+func allocateIP(ip string) error {
+	return nil
+}
+
+// TODO(cuonglm): implement.
+func deAllocateIP(ip string) error {
+	return nil
+}
diff --git a/cmd/ctrld/prog.go b/cmd/ctrld/prog.go
new file mode 100644
index 0000000..a016ea5
--- /dev/null
+++ b/cmd/ctrld/prog.go
@@ -0,0 +1,159 @@
+package main
+
+import (
+	"errors"
+	"net"
+	"os"
+	"strconv"
+	"sync"
+	"syscall"
+
+	"github.com/kardianos/service"
+	"github.com/miekg/dns"
+
+	"github.com/Control-D-Inc/ctrld"
+)
+
+var errWindowsAddrInUse = syscall.Errno(0x2740)
+
+var svcConfig = &service.Config{
+	Name:        "ctrld",
+	DisplayName: "Control-D Helper Service",
+}
+
+type prog struct {
+	cfg *ctrld.Config
+}
+
+func (p *prog) Start(s service.Service) error {
+	p.cfg = &cfg
+	go p.run()
+	return nil
+}
+
+func (p *prog) run() {
+	var wg sync.WaitGroup
+	wg.Add(len(p.cfg.Listener))
+
+	for _, nc := range p.cfg.Network {
+		for _, cidr := range nc.Cidrs {
+			_, ipNet, err := net.ParseCIDR(cidr)
+			if err != nil {
+				proxyLog.Error().Err(err).Str("network", nc.Name).Str("cidr", cidr).Msg("invalid cidr")
+				continue
+			}
+			nc.IPNets = append(nc.IPNets, ipNet)
+		}
+	}
+	for n := range p.cfg.Upstream {
+		uc := p.cfg.Upstream[n]
+		uc.Init()
+
+		if uc.BootstrapIP == "" {
+			// resolve it manually and set the bootstrap ip
+			c := new(dns.Client)
+			m := new(dns.Msg)
+			m.SetQuestion(uc.Domain+".", dns.TypeA)
+			m.RecursionDesired = true
+			r, _, err := c.Exchange(m, net.JoinHostPort(bootstrapDNS, "53"))
+			if err != nil {
+				proxyLog.Error().Err(err).Msgf("could not resolve domain %s for upstream.%s", uc.Domain, n)
+			} else {
+				if r.Rcode != dns.RcodeSuccess {
+					proxyLog.Error().Msgf("could not resolve domain return code: %d, upstream.%s", r.Rcode, n)
+				} else {
+					for _, a := range r.Answer {
+						if ar, ok := a.(*dns.A); ok {
+							uc.BootstrapIP = ar.A.String()
+							proxyLog.Info().Str("bootstrap_ip", uc.BootstrapIP).Msgf("Setting bootstrap IP for upstream.%s", n)
+						}
+					}
+				}
+			}
+		}
+	}
+
+	for listenerNum := range p.cfg.Listener {
+		go func(listenerNum string) {
+			defer wg.Done()
+			listenerConfig := p.cfg.Listener[listenerNum]
+			upstreamConfig := p.cfg.Upstream[listenerNum]
+			if upstreamConfig == nil {
+				proxyLog.Error().Msgf("missing upstream config for: [listener.%s]", listenerNum)
+				return
+			}
+			addr := net.JoinHostPort(listenerConfig.IP, strconv.Itoa(listenerConfig.Port))
+			proxyLog.Info().Msgf("Starting DNS server on listener.%s: %s", listenerNum, addr)
+			err := p.serveUDP(listenerNum)
+			if err != nil && !defaultConfigWritten {
+				proxyLog.Error().Err(err).Msgf("Unable to start dns proxy on listener.%s", listenerNum)
+				return
+			}
+
+			if opErr, ok := err.(*net.OpError); ok {
+				if sErr, ok := opErr.Err.(*os.SyscallError); ok && errors.Is(opErr.Err, syscall.EADDRINUSE) || errors.Is(sErr.Err, errWindowsAddrInUse) {
+					proxyLog.Warn().Msgf("Address %s already in used, pick a random one", addr)
+					pc, err := net.ListenPacket("udp", net.JoinHostPort(listenerConfig.IP, "0"))
+					if err != nil {
+						proxyLog.Error().Err(err).Msg("failed to listen packet")
+						return
+					}
+					_, portStr, _ := net.SplitHostPort(pc.LocalAddr().String())
+					port, err := strconv.Atoi(portStr)
+					if err != nil {
+						proxyLog.Error().Err(err).Msg("malformed port")
+						return
+					}
+					listenerConfig.Port = port
+					v.Set("listener", map[string]*ctrld.ListenerConfig{
+						"0": {
+							IP:   "127.0.0.1",
+							Port: port,
+						},
+					})
+					writeConfigFile()
+					proxyLog.Info().Msgf("Starting DNS server on listener.%s: %s", listenerNum, pc.LocalAddr())
+					// There can be a race between closing the listener and start our own UDP server, but it's
+					// rare, and we only do this once, so let conservative here.
+					if err := pc.Close(); err != nil {
+						proxyLog.Error().Err(err).Msg("failed to close packet conn")
+						return
+					}
+					if err := p.serveUDP(listenerNum); err != nil {
+						proxyLog.Error().Err(err).Msgf("Unable to start dns proxy on listener.%s", listenerNum)
+						return
+					}
+				}
+			}
+		}(listenerNum)
+	}
+
+	wg.Wait()
+}
+
+func (p *prog) Stop(s service.Service) error {
+	if err := p.deAllocateIP(); err != nil {
+		mainLog.Error().Err(err).Msg("de-allocate ip failed")
+		return err
+	}
+	return nil
+}
+
+func (p *prog) allocateIP(ip string) error {
+	if !p.cfg.Service.AllocateIP {
+		return nil
+	}
+	return allocateIP(ip)
+}
+
+func (p *prog) deAllocateIP() error {
+	if !p.cfg.Service.AllocateIP {
+		return nil
+	}
+	for _, lc := range p.cfg.Listener {
+		if err := deAllocateIP(lc.IP); err != nil {
+			return err
+		}
+	}
+	return nil
+}
diff --git a/config.go b/config.go
new file mode 100644
index 0000000..2ec92e8
--- /dev/null
+++ b/config.go
@@ -0,0 +1,140 @@
+package ctrld
+
+import (
+	"net"
+	"net/url"
+	"strings"
+
+	"github.com/go-playground/validator/v10"
+	"github.com/spf13/viper"
+)
+
+// InitConfig initializes default config values for given *viper.Viper instance.
+func InitConfig(v *viper.Viper, name string) {
+	v.SetConfigName(name)
+	v.SetConfigType("toml")
+	v.AddConfigPath("$HOME/.ctrld")
+	v.AddConfigPath(".")
+
+	v.SetDefault("service", ServiceConfig{
+		LogLevel: "info",
+	})
+	v.SetDefault("listener", map[string]*ListenerConfig{
+		"0": {
+			IP:   "127.0.0.1",
+			Port: 53,
+		},
+	})
+	v.SetDefault("network", map[string]*NetworkConfig{
+		"0": {
+			Name:  "Network 0",
+			Cidrs: []string{"0.0.0.0/0"},
+		},
+	})
+	v.SetDefault("upstream", map[string]*UpstreamConfig{
+		"0": {
+			BootstrapIP: "76.76.2.11",
+			Name:        "Control D - Anti-Malware",
+			Type:        "doh",
+			Endpoint:    "https://freedns.controld.com/p1",
+			Timeout:     5000,
+		},
+		"1": {
+			BootstrapIP: "76.76.2.11",
+			Name:        "Control D - No Ads",
+			Type:        "doq",
+			Endpoint:    "p2.freedns.controld.com",
+			Timeout:     3000,
+		},
+	})
+}
+
+// Config represents ctrld supported configuration.
+type Config struct {
+	Service  ServiceConfig              `mapstructure:"service"`
+	Network  map[string]*NetworkConfig  `mapstructure:"network" toml:"network" validate:"min=1,dive"`
+	Upstream map[string]*UpstreamConfig `mapstructure:"upstream" toml:"upstream" validate:"min=1,dive"`
+	Listener map[string]*ListenerConfig `mapstructure:"listener" toml:"listener" validate:"min=1,dive"`
+}
+
+// ServiceConfig specifies the general ctrld config.
+type ServiceConfig struct {
+	LogLevel   string `mapstructure:"log_level" toml:"log_level"`
+	LogPath    string `mapstructure:"log_path" toml:"log_path"`
+	Daemon     bool   `mapstructure:"-" toml:"-"`
+	AllocateIP bool   `mapstructure:"-" toml:"-"`
+}
+
+// NetworkConfig specifies configuration for networks where ctrld will handle requests.
+type NetworkConfig struct {
+	Name   string       `mapstructure:"name" toml:"name"`
+	Cidrs  []string     `mapstructure:"cidrs" toml:"cidrs" validate:"dive,cidr"`
+	IPNets []*net.IPNet `mapstructure:"-" toml:"-"`
+}
+
+// UpstreamConfig specifies configuration for upstreams that ctrld will forward requests to.
+type UpstreamConfig struct {
+	Name        string `mapstructure:"name" toml:"name"`
+	Type        string `mapstructure:"type" toml:"type" validate:"oneof=doh doh3 dot doq os legacy"`
+	Endpoint    string `mapstructure:"endpoint" toml:"endpoint" validate:"required_unless=Type os"`
+	BootstrapIP string `mapstructure:"bootstrap_ip" toml:"bootstrap_ip"`
+	Domain      string `mapstructure:"-" toml:"-"`
+	Timeout     int    `mapstructure:"timeout" toml:"timeout" validate:"gte=0"`
+}
+
+// ListenerConfig specifies the networks configuration that ctrld will run on.
+type ListenerConfig struct {
+	IP         string                `mapstructure:"ip" toml:"ip" validate:"ip"`
+	Port       int                   `mapstructure:"port" toml:"port" validate:"gt=0"`
+	Restricted bool                  `mapstructure:"restricted" toml:"restricted"`
+	Policy     *ListenerPolicyConfig `mapstructure:"policy" toml:"policy"`
+}
+
+// ListenerPolicyConfig specifies the policy rules for ctrld to filter incoming requests.
+type ListenerPolicyConfig struct {
+	Name     string `mapstructure:"name" toml:"name"`
+	Networks []Rule `mapstructure:"networks" toml:"networks" validate:"dive,len=1"`
+	Rules    []Rule `mapstructure:"rules" toml:"rules" validate:"dive,len=1"`
+}
+
+// Rule is a map from source to list of upstreams.
+// ctrld uses rule to perform requests matching and forward
+// the request to corresponding upstreams if it's matched.
+type Rule map[string][]string
+
+// Init initialized necessary values for an UpstreamConfig.
+func (uc *UpstreamConfig) Init() {
+	if u, err := url.Parse(uc.Endpoint); err == nil {
+		uc.Domain = u.Host
+	}
+	if uc.Domain != "" {
+		return
+	}
+
+	if !strings.Contains(uc.Endpoint, ":") {
+		uc.Domain = uc.Endpoint
+		uc.Endpoint = net.JoinHostPort(uc.Endpoint, defaultPortFor(uc.Type))
+	}
+	host, _, _ := net.SplitHostPort(uc.Endpoint)
+	uc.Domain = host
+	if net.ParseIP(uc.Domain) != nil {
+		uc.BootstrapIP = uc.Domain
+	}
+}
+
+// ValidateConfig validates the given config.
+func ValidateConfig(validate *validator.Validate, cfg *Config) error {
+	return validate.Struct(cfg)
+}
+
+func defaultPortFor(typ string) string {
+	switch typ {
+	case resolverTypeDOH, resolverTypeDOH3:
+		return "443"
+	case resolverTypeDOQ, resolverTypeDOT:
+		return "853"
+	case resolverTypeLegacy:
+		return "53"
+	}
+	return "53"
+}
diff --git a/config_test.go b/config_test.go
new file mode 100644
index 0000000..ef038c3
--- /dev/null
+++ b/config_test.go
@@ -0,0 +1,269 @@
+package ctrld_test
+
+import (
+	"testing"
+
+	"github.com/go-playground/validator/v10"
+	"github.com/spf13/viper"
+	"github.com/stretchr/testify/assert"
+	"github.com/stretchr/testify/require"
+
+	"github.com/Control-D-Inc/ctrld"
+	"github.com/Control-D-Inc/ctrld/testhelper"
+)
+
+func TestLoadConfig(t *testing.T) {
+	cfg := testhelper.SampleConfig(t)
+	validate := validator.New()
+	require.NoError(t, ctrld.ValidateConfig(validate, cfg))
+
+	assert.Equal(t, "info", cfg.Service.LogLevel)
+	assert.Equal(t, "/path/to/log.log", cfg.Service.LogPath)
+
+	assert.Len(t, cfg.Network, 2)
+	assert.Contains(t, cfg.Network, "0")
+	assert.Contains(t, cfg.Network, "1")
+
+	assert.Len(t, cfg.Upstream, 3)
+	assert.Contains(t, cfg.Upstream, "0")
+	assert.Contains(t, cfg.Upstream, "1")
+	assert.Contains(t, cfg.Upstream, "2")
+
+	assert.Len(t, cfg.Listener, 2)
+	assert.Contains(t, cfg.Listener, "0")
+	assert.Contains(t, cfg.Listener, "1")
+
+	require.NotNil(t, cfg.Listener["0"].Policy)
+	assert.Equal(t, "My Policy", cfg.Listener["0"].Policy.Name)
+	require.NotNil(t, cfg.Listener["0"].Policy.Networks)
+	assert.Len(t, cfg.Listener["0"].Policy.Networks, 3)
+
+	require.NotNil(t, cfg.Listener["0"].Policy.Rules)
+	assert.Len(t, cfg.Listener["0"].Policy.Rules, 2)
+	assert.Contains(t, cfg.Listener["0"].Policy.Rules[0], "*.ru")
+	assert.Contains(t, cfg.Listener["0"].Policy.Rules[1], "*.local.host")
+}
+
+func TestLoadDefaultConfig(t *testing.T) {
+	cfg := defaultConfig(t)
+	validate := validator.New()
+	require.NoError(t, ctrld.ValidateConfig(validate, cfg))
+	assert.Len(t, cfg.Listener, 1)
+	assert.Len(t, cfg.Upstream, 2)
+}
+
+func TestConfigValidation(t *testing.T) {
+	tests := []struct {
+		name    string
+		cfg     *ctrld.Config
+		wantErr bool
+	}{
+		{"invalid Config", &ctrld.Config{}, true},
+		{"default Config", defaultConfig(t), false},
+		{"sample Config", testhelper.SampleConfig(t), false},
+		{"invalid cidr", invalidNetworkConfig(t), true},
+		{"invalid upstream type", invalidUpstreamType(t), true},
+		{"invalid upstream timeout", invalidUpstreamTimeout(t), true},
+		{"invalid upstream missing endpoint", invalidUpstreamMissingEndpoind(t), true},
+		{"invalid listener ip", invalidListenerIP(t), true},
+		{"invalid listener port", invalidListenerPort(t), true},
+		{"os upstream", configWithOsUpstream(t), false},
+		{"invalid rules", configWithInvalidRules(t), true},
+	}
+
+	for _, tc := range tests {
+		t.Run(tc.name, func(t *testing.T) {
+			validate := validator.New()
+			err := ctrld.ValidateConfig(validate, tc.cfg)
+			if tc.wantErr && err == nil {
+				t.Fatalf("expected error, but got nil: %+v", tc.cfg)
+			}
+			if !tc.wantErr && err != nil {
+				t.Fatalf("unexpected error: %v", err)
+			}
+			if err != nil {
+				t.Logf("%v", err)
+			}
+		})
+	}
+}
+
+func defaultConfig(t *testing.T) *ctrld.Config {
+	v := viper.New()
+	ctrld.InitConfig(v, "test_load_default_config")
+	_, ok := v.ReadInConfig().(viper.ConfigFileNotFoundError)
+	require.True(t, ok)
+
+	var cfg ctrld.Config
+	require.NoError(t, v.Unmarshal(&cfg))
+	return &cfg
+}
+
+func invalidNetworkConfig(t *testing.T) *ctrld.Config {
+	cfg := defaultConfig(t)
+	cfg.Network["0"].Cidrs = []string{"172.16.256.255/16", "2001:cdba:0000:0000:0000:0000:3257:9652/256"}
+	return cfg
+}
+
+func invalidUpstreamType(t *testing.T) *ctrld.Config {
+	cfg := defaultConfig(t)
+	cfg.Upstream["0"].Type = "DOH"
+	return cfg
+}
+
+func invalidUpstreamTimeout(t *testing.T) *ctrld.Config {
+	cfg := defaultConfig(t)
+	cfg.Upstream["0"].Timeout = -1
+	return cfg
+}
+
+func invalidUpstreamMissingEndpoind(t *testing.T) *ctrld.Config {
+	cfg := defaultConfig(t)
+	cfg.Upstream["0"].Endpoint = ""
+	return cfg
+}
+
+func invalidListenerIP(t *testing.T) *ctrld.Config {
+	cfg := defaultConfig(t)
+	cfg.Listener["0"].IP = "invalid ip"
+	return cfg
+}
+
+func invalidListenerPort(t *testing.T) *ctrld.Config {
+	cfg := defaultConfig(t)
+	cfg.Listener["0"].Port = 0
+	return cfg
+}
+
+func configWithOsUpstream(t *testing.T) *ctrld.Config {
+	cfg := defaultConfig(t)
+	cfg.Upstream["os"] = &ctrld.UpstreamConfig{
+		Name:     "OS",
+		Type:     "os",
+		Endpoint: "",
+	}
+	return cfg
+}
+
+func configWithInvalidRules(t *testing.T) *ctrld.Config {
+	cfg := defaultConfig(t)
+	cfg.Listener["0"].Policy = &ctrld.ListenerPolicyConfig{
+		Name:     "Invalid Policy",
+		Networks: []ctrld.Rule{{"*.com": []string{"upstream.1"}, "*.net": []string{"upstream.0"}}},
+		Rules:    nil,
+	}
+	return cfg
+}
+
+func TestUpstreamConfig_Init(t *testing.T) {
+	tests := []struct {
+		name     string
+		uc       *ctrld.UpstreamConfig
+		expected *ctrld.UpstreamConfig
+	}{
+		{
+			"doh+doh3",
+			&ctrld.UpstreamConfig{
+				Name:        "doh",
+				Type:        "doh",
+				Endpoint:    "https://example.com",
+				BootstrapIP: "",
+				Domain:      "",
+				Timeout:     0,
+			},
+			&ctrld.UpstreamConfig{
+				Name:        "doh",
+				Type:        "doh",
+				Endpoint:    "https://example.com",
+				BootstrapIP: "",
+				Domain:      "example.com",
+				Timeout:     0,
+			},
+		},
+		{
+			"dot+doq",
+			&ctrld.UpstreamConfig{
+				Name:        "dot",
+				Type:        "dot",
+				Endpoint:    "freedns.controld.com:8853",
+				BootstrapIP: "",
+				Domain:      "",
+				Timeout:     0,
+			},
+			&ctrld.UpstreamConfig{
+				Name:        "dot",
+				Type:        "dot",
+				Endpoint:    "freedns.controld.com:8853",
+				BootstrapIP: "",
+				Domain:      "freedns.controld.com",
+				Timeout:     0,
+			},
+		},
+		{
+			"dot+doq without port",
+			&ctrld.UpstreamConfig{
+				Name:        "dot",
+				Type:        "dot",
+				Endpoint:    "freedns.controld.com",
+				BootstrapIP: "",
+				Domain:      "",
+				Timeout:     0,
+			},
+			&ctrld.UpstreamConfig{
+				Name:        "dot",
+				Type:        "dot",
+				Endpoint:    "freedns.controld.com:853",
+				BootstrapIP: "",
+				Domain:      "freedns.controld.com",
+				Timeout:     0,
+			},
+		},
+		{
+			"legacy",
+			&ctrld.UpstreamConfig{
+				Name:        "legacy",
+				Type:        "legacy",
+				Endpoint:    "1.2.3.4:53",
+				BootstrapIP: "",
+				Domain:      "",
+				Timeout:     0,
+			},
+			&ctrld.UpstreamConfig{
+				Name:        "legacy",
+				Type:        "legacy",
+				Endpoint:    "1.2.3.4:53",
+				BootstrapIP: "1.2.3.4",
+				Domain:      "1.2.3.4",
+				Timeout:     0,
+			},
+		},
+		{
+			"legacy without port",
+			&ctrld.UpstreamConfig{
+				Name:        "legacy",
+				Type:        "legacy",
+				Endpoint:    "1.2.3.4",
+				BootstrapIP: "",
+				Domain:      "",
+				Timeout:     0,
+			},
+			&ctrld.UpstreamConfig{
+				Name:        "legacy",
+				Type:        "legacy",
+				Endpoint:    "1.2.3.4:53",
+				BootstrapIP: "1.2.3.4",
+				Domain:      "1.2.3.4",
+				Timeout:     0,
+			},
+		},
+	}
+
+	for _, tc := range tests {
+		tc := tc
+		t.Run(tc.name, func(t *testing.T) {
+			t.Parallel()
+			tc.uc.Init()
+			assert.Equal(t, tc.expected, tc.uc)
+		})
+	}
+}
diff --git a/docs/config.md b/docs/config.md
new file mode 100644
index 0000000..3b24144
--- /dev/null
+++ b/docs/config.md
@@ -0,0 +1,303 @@
+# Configuration File
+The config file allows for advanced configuration of the `ctrld` utility to cover a vast array of use cases. 
+1. Source IP based DNS routing policies
+2. Destination IP based DNS routing policies 
+3. Split horizon DNS
+
+- [Config Location](#config-location)
+- [Example Config](#example-config)
+  - [Service](#service) - general configurations 
+  - [Upstreams](#upstream) - where to send DNS queries
+  - [Networks](#network) - where did the DNS queries come from
+  - [Listeners](#listener) - what receives DNS queries and defines policies
+      - [Policies](#policy) - what receives DNS queries and defines policies
+
+
+## Config Location
+`ctrld` uses [TOML](toml_link) format for its configuration file. Default configuration file is `config.toml` found in following order:
+
+ - `$HOME/.ctrld`
+ - Current directory
+
+The user can choose to override default value using command line `--config` or `-c`:
+
+```shell
+ctrld run --config /path/to/myconfig.toml
+```
+
+If no configuration files found, a default `config.toml` file will be created in the current directory.
+
+# Example Config
+
+```toml
+[service]
+    log_level = "info"
+    log_path = ""
+
+[network.0]
+    cidrs = ["0.0.0.0/0"]
+    name = "Everyone"
+
+[network.1]
+    cidrs = ["10.10.10.0/24"]
+    name = "Admins"
+
+[upstream.0]
+    bootstrap_ip = "76.76.2.11"
+    endpoint = "https://freedns.controld.com/p1"
+    name = "Control D - Anti-Malware"
+    timeout = 5000
+    type = "doh"
+
+[upstream.1]
+    bootstrap_ip = "76.76.2.11"
+    endpoint = "p2.freedns.controld.com"
+    name = "Control D - No Ads"
+    timeout = 5000
+    type = "doq"
+
+[upstream.2]
+    bootstrap_ip = "76.76.2.22"
+    endpoint = "private.dns.controld.com"
+    name = "Control D - Private"
+    timeout = 5000
+    type = "dot"
+
+[listener.0]
+    ip = "127.0.0.1"
+    port = 53
+
+[listener.0.policy]
+    name = "My Policy"
+    networks = [
+        {"network.0" = ["upstream.1"]},
+    ]
+    rules = [
+        {"*.local" = ["upstream.1"]},
+        {"test.com" = ["upstream.2", "upstream.1"]},
+    ]
+
+[listener.1]
+    ip = "127.0.0.69"
+    port = 53
+    restricted = true
+```
+
+See below for details on each configuration block.
+
+## Service
+The `[service]` section controls general behaviors. 
+
+```toml
+[service]
+    log_level = "debug"
+    log_path = "log.txt"
+```
+
+### log_level
+Logging level you wish to enable.
+
+ - Type: string
+ - Required: no
+ - Valid values: `debug`, `info`, `warn`, `error`, `fatal`, `panic`
+ - Default: `info`
+
+
+### log_path
+Relative or absolute path of the log file. 
+
+- Type: string
+- Required: no
+
+The above config will look like this at query time.
+
+```
+2022-11-14T22:18:53.808 INF Setting bootstrap IP for upstream.0 bootstrap_ip=76.76.2.11
+2022-11-14T22:18:53.808 INF Starting DNS server on listener.0: 127.0.0.1:53
+2022-11-14T22:18:56.381 DBG [9fd5d3] 127.0.0.1:53978 -> listener.0: 127.0.0.1:53: received query: verify.controld.com
+2022-11-14T22:18:56.381 INF [9fd5d3] no policy, no network, no rule -> [upstream.0]
+2022-11-14T22:18:56.381 DBG [9fd5d3] sending query to upstream.0: Control D - DOH Free
+2022-11-14T22:18:56.381 DBG [9fd5d3] debug dial context freedns.controld.com:443 - tcp - 76.76.2.0
+2022-11-14T22:18:56.381 DBG [9fd5d3] sending doh request to: 76.76.2.11:443
+2022-11-14T22:18:56.420 DBG [9fd5d3] received response of 118 bytes in 39.662597ms
+```
+
+## Upstream
+The `[upstream]` section specifies the DNS upstream servers that `ctrld` will forward DNS requests to.
+
+```toml
+[upstream.0]
+  bootstrap_ip = ""
+  endpoint = "https://freedns.controld.com/p1"
+  name = "Control D - DOH"
+  timeout = 5000
+  type = "doh"
+  
+[upstream.1]
+  bootstrap_ip = ""
+  endpoint = "https://freedns.controld.com/p1"
+  name = "Control D - DOH3"
+  timeout = 5000
+  type = "doh3"
+  
+[upstream.2]
+  bootstrap_ip = ""
+  endpoint = "p1.freedns.controld.com"
+  name = "Controld D - DOT"
+  timeout = 5000
+  type = "dot"
+  
+[upstream.3]
+  bootstrap_ip = ""
+  endpoint = "p1.freedns.controld.com"
+  name = "Controld D - DOT"
+  timeout = 5000
+  type = "doq"
+  
+[upstream.4]
+  bootstrap_ip = ""
+  endpoint = "76.76.2.2"
+  name = "Control D - Ad Blocking"
+  timeout = 5000
+  type = "legacy"
+```
+
+### bootstrap_ip
+IP address of upstream DNS server when hostname or URL is used. This exists to prevent the bootstrapping cycle problem.
+For example, if the `Endpoint` is set to `https://freedns.controld.com/p1`, `ctrld` needs to know the ip address of `freedns.controld.com` to be able to do communication. To do that, `ctrld` may need to use OS resolver, which may or may not be set.
+
+If `bootstrap_ip` is empty, `ctrld` will resolve this itself using its own bootstrap DNS, normal users should not care about `bootstrap_ip` and just leave it empty.
+
+ - type: ip address string
+ - required: no
+
+### endpoint
+IP address, hostname or URL of upstream DNS. Used together with `Type` of the endpoint.
+
+ - Type: string
+ - Required: yes
+
+ Default ports are implied for each protocol, but can be overriden. ie. `p1.freedns.controld.com:1024`
+
+### name
+Human-readable name of the upstream.
+
+- Type: string
+- Required: no
+
+### timeout
+Timeout in milliseconds before request failsover to the next upstream (if defined). 
+
+Value `0` means no timeout.
+
+ - Type: number
+ - required: no
+
+### type
+The protocol that `ctrld` will use to send DNS requests to upstream.
+
+ - Type: string
+ - required: yes
+ - Valid values: `doh`, `doh3`, `dot`, `doq`, `legacy`, `os`
+
+## Network
+The `[network]` section defines networks from which DNS queries can originate from. These are used in policies. You can define multiple networks, and each one can have multiple cidrs.
+
+```toml
+[network.0]
+  cidrs = ["0.0.0.0/0"]
+  name = "Any Network"
+  
+[network.1]
+  cidrs = ["192.168.1.0/24"]
+  name = "Home Wifi "
+```
+
+### name
+Name of the network.
+
+ - Type: string
+ - Required: no
+
+### cidrs
+Specifies the network addresses that the `listener` will accept requests from. You will see more details in the listener policy section.
+
+ - Type: array of network CIDR string
+ - Required: no
+
+
+## listener
+The `[listener]` section specifies the ip and port of the local DNS server. You can have multiple listeners, and attached policies.
+
+```toml
+[listener.0]
+  ip = "127.0.0.1"
+  port = 53
+  
+[listener.1]
+  ip = "10.10.10.1"
+  port = 53
+  restricted = true
+```
+
+### ip
+IP address that serves the incoming requests.
+
+- Type: string
+- Required: yes
+
+### port
+Port number that the listener will listen on for incoming requests.
+
+- Type: number
+- Required: yes
+
+### restricted
+If set to `true` makes the listener `REFUSE` DNS queries from all source IP addresses that are not explicitly defined in the policy using a `network`. 
+
+- Type: bool
+- Required: no
+
+### policy
+Allows `ctrld` to set policy rules to determine which upstreams the requests will be forwarded to.
+If no `policy` is defined or the requests do not match any policy rules, it will be forwarded to corresponding upstream of the listener. For example, the request to `listener.0` will be forwarded to `upstream.0`.
+
+The policy `rule` syntax is a simple `toml` inline table with exactly one key/value pair per rule. `key` is either the `network` or a domain. Value is the list of the upstreams. For example:
+
+```toml
+[listener.0.policy]
+name = "My Policy"
+
+networks = [
+    {"network.0" = ["upstream.1"]},
+]
+
+rules = [
+    {"*.local" = ["upstream.1"]},
+    {"test.com" = ["upstream.2", "upstream.1"]},
+]
+```
+
+Above policy will:
+- Forward requests on `listener.0` from `network.0` to `upstream.1`.
+- Forward requests on `listener.0` for `.local` suffixed domains to `upstream.1`.
+- Forward requests on `listener.0` for `test.com` to `upstream.2`. If timeout is reached, retry on `upstream.1`.
+- All other requests on `listener.0` that do not match above conditions will be forwarded to `upstream.0`.
+
+#### name
+`name` is the name for the policy.
+
+- Type: string
+- Required: no
+
+### networks:
+`networks` is the list of network rules of the policy.
+
+- type: array of networks
+
+### rules:
+`rules` is the list of domain rules within the policy. Domain can be either FQDN or wildcard domain.
+
+- type: array of rule
+
+[toml_link]: https://toml.io/en
diff --git a/docs/contributing.md b/docs/contributing.md
new file mode 100644
index 0000000..bd077df
--- /dev/null
+++ b/docs/contributing.md
@@ -0,0 +1,5 @@
+# Contribution Guideline
+
+Pull requests are welcome!
+
+Please filling [an issue](https://github.com/Control-D-Inc/ctrld/issues/new/choose) before submitting the PR.
\ No newline at end of file
diff --git a/doh.go b/doh.go
new file mode 100644
index 0000000..f3e3810
--- /dev/null
+++ b/doh.go
@@ -0,0 +1,99 @@
+package ctrld
+
+import (
+	"context"
+	"crypto/tls"
+	"encoding/base64"
+	"fmt"
+	"io"
+	"net"
+	"net/http"
+	"time"
+
+	"github.com/lucas-clemente/quic-go"
+	"github.com/lucas-clemente/quic-go/http3"
+	"github.com/miekg/dns"
+)
+
+func newDohResolver(uc *UpstreamConfig) *dohResolver {
+	http.DefaultTransport.(*http.Transport).DialContext = func(ctx context.Context, network, addr string) (net.Conn, error) {
+		dialer := &net.Dialer{
+			Timeout:   10 * time.Second,
+			KeepAlive: 10 * time.Second,
+		}
+		Log(ctx, ProxyLog.Debug(), "debug dial context %s - %s - %s", addr, network, bootstrapDNS)
+		// if we have a bootstrap ip set, use it to avoid DNS lookup
+		if uc.BootstrapIP != "" && addr == fmt.Sprintf("%s:443", uc.Domain) {
+			addr = fmt.Sprintf("%s:443", uc.BootstrapIP)
+			Log(ctx, ProxyLog.Debug(), "sending doh request to: %s", addr)
+		}
+		return dialer.DialContext(ctx, network, addr)
+	}
+	r := &dohResolver{endpoint: uc.Endpoint, isDoH3: uc.Type == resolverTypeDOH3}
+	if r.isDoH3 {
+		r.doh3DialFunc = func(ctx context.Context, addr string, tlsCfg *tls.Config, cfg *quic.Config) (quic.EarlyConnection, error) {
+			host := addr
+			Log(ctx, ProxyLog.Debug(), "debug dial context D0H3 %s - %s", addr, bootstrapDNS)
+			// if we have a bootstrap ip set, use it to avoid DNS lookup
+			if uc.BootstrapIP != "" && addr == fmt.Sprintf("%s:443", uc.Domain) {
+				addr = fmt.Sprintf("%s:443", uc.BootstrapIP)
+				Log(ctx, ProxyLog.Debug(), "sending doh3 request to: %s", addr)
+			}
+			remoteAddr, err := net.ResolveUDPAddr("udp", addr)
+			if err != nil {
+				return nil, err
+			}
+			udpConn, err := net.ListenUDP("udp", &net.UDPAddr{IP: net.IPv4zero, Port: 0})
+			if err != nil {
+				return nil, err
+			}
+			return quic.DialEarlyContext(ctx, udpConn, remoteAddr, host, tlsCfg, cfg)
+		}
+	}
+	return r
+}
+
+type dohResolver struct {
+	endpoint     string
+	isDoH3       bool
+	doh3DialFunc func(ctx context.Context, addr string, tlsCfg *tls.Config, cfg *quic.Config) (quic.EarlyConnection, error)
+}
+
+func (r *dohResolver) Resolve(ctx context.Context, msg *dns.Msg) (*dns.Msg, error) {
+	data, err := msg.Pack()
+	if err != nil {
+		return nil, err
+	}
+	enc := base64.RawURLEncoding.EncodeToString(data)
+	url := fmt.Sprintf("%s?dns=%s", r.endpoint, enc)
+	req, err := http.NewRequestWithContext(ctx, http.MethodGet, url, nil)
+	if err != nil {
+		return nil, fmt.Errorf("could not create request: %w", err)
+	}
+	req.Header.Set("Content-Type", "application/dns-message")
+	req.Header.Set("Accept", "application/dns-message")
+
+	c := http.Client{}
+	if r.isDoH3 {
+		c.Transport = &http3.RoundTripper{}
+		c.Transport.(*http3.RoundTripper).Dial = r.doh3DialFunc
+		defer c.Transport.(*http3.RoundTripper).Close()
+	}
+	resp, err := c.Do(req)
+	if err != nil {
+		return nil, fmt.Errorf("could not perform request: %w", err)
+	}
+	defer resp.Body.Close()
+
+	buf, err := io.ReadAll(resp.Body)
+	if err != nil {
+		return nil, fmt.Errorf("could not read message from response: %w", err)
+	}
+
+	if resp.StatusCode != http.StatusOK {
+		return nil, fmt.Errorf("wrong response from DOH server, got: %s, status: %d", string(buf), resp.StatusCode)
+	}
+
+	answer := new(dns.Msg)
+	return answer, answer.Unpack(buf)
+}
diff --git a/doq.go b/doq.go
new file mode 100644
index 0000000..4ac3f43
--- /dev/null
+++ b/doq.go
@@ -0,0 +1,75 @@
+package ctrld
+
+import (
+	"context"
+	"crypto/tls"
+	"io"
+	"net"
+	"time"
+
+	"github.com/lucas-clemente/quic-go"
+	"github.com/miekg/dns"
+)
+
+type doqResolver struct {
+	uc *UpstreamConfig
+}
+
+func (r *doqResolver) Resolve(ctx context.Context, msg *dns.Msg) (*dns.Msg, error) {
+	endpoint := r.uc.Endpoint
+	tlsConfig := &tls.Config{NextProtos: []string{"doq"}}
+	if r.uc.BootstrapIP != "" {
+		tlsConfig.ServerName = r.uc.Domain
+		_, port, _ := net.SplitHostPort(endpoint)
+		endpoint = net.JoinHostPort(r.uc.BootstrapIP, port)
+	}
+	return resolve(ctx, msg, endpoint, tlsConfig)
+}
+
+func resolve(ctx context.Context, msg *dns.Msg, endpoint string, tlsConfig *tls.Config) (*dns.Msg, error) {
+	session, err := quic.DialAddr(endpoint, tlsConfig, nil)
+	if err != nil {
+		return nil, err
+	}
+	defer session.CloseWithError(quic.ApplicationErrorCode(quic.NoError), "")
+
+	msgBytes, err := msg.Pack()
+	if err != nil {
+		return nil, err
+	}
+
+	stream, err := session.OpenStream()
+	if err != nil {
+		return nil, err
+	}
+
+	deadline, ok := ctx.Deadline()
+	if !ok {
+		deadline = time.Now().Add(5 * time.Second)
+	}
+	_ = stream.SetDeadline(deadline)
+
+	var msgLen = uint16(len(msgBytes))
+	var msgLenBytes = []byte{byte(msgLen >> 8), byte(msgLen & 0xFF)}
+	if _, err := stream.Write(msgLenBytes); err != nil {
+		return nil, err
+	}
+
+	if _, err := stream.Write(msgBytes); err != nil {
+		return nil, err
+	}
+
+	buf, err := io.ReadAll(stream)
+	if err != nil {
+		return nil, err
+	}
+
+	_ = stream.Close()
+
+	answer := new(dns.Msg)
+	if err := answer.Unpack(buf[2:]); err != nil {
+		return nil, err
+	}
+	answer.SetReply(msg)
+	return answer, nil
+}
diff --git a/dot.go b/dot.go
new file mode 100644
index 0000000..4107467
--- /dev/null
+++ b/dot.go
@@ -0,0 +1,35 @@
+package ctrld
+
+import (
+	"context"
+	"crypto/tls"
+	"net"
+
+	"github.com/miekg/dns"
+)
+
+type dotResolver struct {
+	uc *UpstreamConfig
+}
+
+func (r *dotResolver) Resolve(ctx context.Context, msg *dns.Msg) (*dns.Msg, error) {
+	// The dialer is used to prevent bootstrapping cycle.
+	// If r.endpoing is set to dns.controld.dev, we need to resolve
+	// dns.controld.dev first. By using a dialer with custom resolver,
+	// we ensure that we can always resolve the bootstrap domain
+	// regardless of the machine DNS status.
+	dialer := newDialer(net.JoinHostPort(bootstrapDNS, "53"))
+	dnsClient := &dns.Client{
+		Net:    "tcp-tls",
+		Dialer: dialer,
+	}
+	endpoint := r.uc.Endpoint
+	if r.uc.BootstrapIP != "" {
+		dnsClient.TLSConfig = &tls.Config{ServerName: r.uc.Domain}
+		_, port, _ := net.SplitHostPort(endpoint)
+		endpoint = net.JoinHostPort(r.uc.BootstrapIP, port)
+	}
+
+	answer, _, err := dnsClient.ExchangeContext(ctx, msg, endpoint)
+	return answer, err
+}
diff --git a/go.mod b/go.mod
new file mode 100644
index 0000000..67ec79a
--- /dev/null
+++ b/go.mod
@@ -0,0 +1,53 @@
+module github.com/Control-D-Inc/ctrld
+
+go 1.19
+
+require (
+	github.com/go-playground/validator/v10 v10.11.1
+	github.com/kardianos/service v1.2.1
+	github.com/lucas-clemente/quic-go v0.29.1
+	github.com/miekg/dns v1.1.50
+	github.com/pelletier/go-toml v1.9.5
+	github.com/rs/zerolog v1.28.0
+	github.com/spf13/cobra v1.1.1
+	github.com/spf13/viper v1.7.0
+	github.com/stretchr/testify v1.7.1
+)
+
+require (
+	github.com/davecgh/go-spew v1.1.1 // indirect
+	github.com/fsnotify/fsnotify v1.5.4 // indirect
+	github.com/go-playground/locales v0.14.0 // indirect
+	github.com/go-playground/universal-translator v0.18.0 // indirect
+	github.com/go-task/slim-sprig v0.0.0-20210107165309-348f09dbbbc0 // indirect
+	github.com/golang/mock v1.6.0 // indirect
+	github.com/hashicorp/hcl v1.0.0 // indirect
+	github.com/inconshreveable/mousetrap v1.0.0 // indirect
+	github.com/leodido/go-urn v1.2.1 // indirect
+	github.com/magiconair/properties v1.8.1 // indirect
+	github.com/marten-seemann/qpack v0.2.1 // indirect
+	github.com/marten-seemann/qtls-go1-18 v0.1.2 // indirect
+	github.com/marten-seemann/qtls-go1-19 v0.1.0 // indirect
+	github.com/mattn/go-colorable v0.1.12 // indirect
+	github.com/mattn/go-isatty v0.0.14 // indirect
+	github.com/mitchellh/mapstructure v1.5.0 // indirect
+	github.com/nxadm/tail v1.4.8 // indirect
+	github.com/onsi/ginkgo v1.16.5 // indirect
+	github.com/pmezard/go-difflib v1.0.0 // indirect
+	github.com/spf13/afero v1.1.2 // indirect
+	github.com/spf13/cast v1.3.0 // indirect
+	github.com/spf13/jwalterweatherman v1.0.0 // indirect
+	github.com/spf13/pflag v1.0.5 // indirect
+	github.com/subosito/gotenv v1.2.0 // indirect
+	golang.org/x/crypto v0.0.0-20220829220503-c86fa9a7ed90 // indirect
+	golang.org/x/exp v0.0.0-20220827204233-334a2380cb91 // indirect
+	golang.org/x/mod v0.6.0-dev.0.20220419223038-86c51ed26bb4 // indirect
+	golang.org/x/net v0.0.0-20221004154528-8021a29435af // indirect
+	golang.org/x/sys v0.0.0-20221010170243-090e33056c14 // indirect
+	golang.org/x/text v0.3.7 // indirect
+	golang.org/x/tools v0.1.12 // indirect
+	gopkg.in/ini.v1 v1.51.0 // indirect
+	gopkg.in/tomb.v1 v1.0.0-20141024135613-dd632973f1e7 // indirect
+	gopkg.in/yaml.v2 v2.4.0 // indirect
+	gopkg.in/yaml.v3 v3.0.0-20210107192922-496545a6307b // indirect
+)
diff --git a/go.sum b/go.sum
new file mode 100644
index 0000000..d971225
--- /dev/null
+++ b/go.sum
@@ -0,0 +1,457 @@
+cloud.google.com/go v0.26.0/go.mod h1:aQUYkXzVsufM+DwF1aE+0xfcU+56JwCaLick0ClmMTw=
+cloud.google.com/go v0.34.0/go.mod h1:aQUYkXzVsufM+DwF1aE+0xfcU+56JwCaLick0ClmMTw=
+cloud.google.com/go v0.38.0/go.mod h1:990N+gfupTy94rShfmMCWGDn0LpTmnzTp2qbd1dvSRU=
+cloud.google.com/go v0.44.1/go.mod h1:iSa0KzasP4Uvy3f1mN/7PiObzGgflwredwwASm/v6AU=
+cloud.google.com/go v0.44.2/go.mod h1:60680Gw3Yr4ikxnPRS/oxxkBccT6SA1yMk63TGekxKY=
+cloud.google.com/go v0.45.1/go.mod h1:RpBamKRgapWJb87xiFSdk4g1CME7QZg3uwTez+TSTjc=
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diff --git a/log.go b/log.go
new file mode 100644
index 0000000..a4689b3
--- /dev/null
+++ b/log.go
@@ -0,0 +1,29 @@
+package ctrld
+
+import (
+	"context"
+	"fmt"
+	"io"
+
+	"github.com/rs/zerolog"
+)
+
+// ProxyLog emits the log record for proxy operations.
+// The caller should set it only once.
+var ProxyLog = zerolog.New(io.Discard)
+
+// ReqIdCtxKey is the context.Context key for a request id.
+type ReqIdCtxKey struct{}
+
+// Log emits the logs for a particular zerolog event.
+// The request id associated with the context will be included if presents.
+func Log(ctx context.Context, e *zerolog.Event, format string, v ...any) {
+	id, ok := ctx.Value(ReqIdCtxKey{}).(string)
+	if !ok {
+		e.Msgf(format, v...)
+		return
+	}
+	e.MsgFunc(func() string {
+		return fmt.Sprintf("[%s] %s", id, fmt.Sprintf(format, v...))
+	})
+}
diff --git a/resolver.go b/resolver.go
new file mode 100644
index 0000000..ac065ce
--- /dev/null
+++ b/resolver.go
@@ -0,0 +1,112 @@
+package ctrld
+
+import (
+	"context"
+	"errors"
+	"fmt"
+	"net"
+	"strings"
+
+	"github.com/miekg/dns"
+)
+
+const (
+	resolverTypeDOH    = "doh"
+	resolverTypeDOH3   = "doh3"
+	resolverTypeDOT    = "dot"
+	resolverTypeDOQ    = "doq"
+	resolverTypeOS     = "os"
+	resolverTypeLegacy = "legacy"
+)
+
+var bootstrapDNS = "76.76.2.0"
+
+// Resolver is the interface that wraps the basic DNS operations.
+//
+// Resolve resolves the DNS query, return the result and the corresponding error.
+type Resolver interface {
+	Resolve(ctx context.Context, msg *dns.Msg) (*dns.Msg, error)
+}
+
+var errUnknownResolver = errors.New("unknown resolver")
+
+// NewResolver creates a Resolver based on the given upstream config.
+func NewResolver(uc *UpstreamConfig) (Resolver, error) {
+	typ, endpoint := uc.Type, uc.Endpoint
+	switch typ {
+	case resolverTypeDOH, resolverTypeDOH3:
+		return newDohResolver(uc), nil
+	case resolverTypeDOT:
+		return &dotResolver{uc: uc}, nil
+	case resolverTypeDOQ:
+		return &doqResolver{uc: uc}, nil
+	case resolverTypeOS:
+		return &osResolver{}, nil
+	case resolverTypeLegacy:
+		return &legacyResolver{endpoint: endpoint}, nil
+	}
+	return nil, fmt.Errorf("%w: %s", errUnknownResolver, typ)
+}
+
+type osResolver struct{}
+
+func (o *osResolver) Resolve(ctx context.Context, msg *dns.Msg) (*dns.Msg, error) {
+	domain := canonicalName(msg.Question[0].Name)
+	addrs, err := net.DefaultResolver.LookupHost(ctx, domain)
+	if err != nil {
+		return nil, err
+	}
+	if len(addrs) == 0 {
+		return nil, errors.New("no answer")
+	}
+	answer := new(dns.Msg)
+	answer.SetReply(msg)
+	ip := net.ParseIP(addrs[0])
+	a := &dns.A{
+		A:   ip,
+		Hdr: dns.RR_Header{Name: msg.Question[0].Name, Rrtype: dns.TypeAAAA, Class: dns.ClassINET, Ttl: 10},
+	}
+	if ip.To4() != nil {
+		a.Hdr.Rrtype = dns.TypeA
+	}
+
+	msg.Answer = append(msg.Answer, a)
+	return msg, nil
+}
+
+func newDialer(dnsAddress string) *net.Dialer {
+	return &net.Dialer{
+		Resolver: &net.Resolver{
+			PreferGo: true,
+			Dial: func(ctx context.Context, network, address string) (net.Conn, error) {
+				d := net.Dialer{}
+				return d.DialContext(ctx, network, dnsAddress)
+			},
+		},
+	}
+}
+
+type legacyResolver struct {
+	endpoint string
+}
+
+func (r *legacyResolver) Resolve(ctx context.Context, msg *dns.Msg) (*dns.Msg, error) {
+	// See comment in (*dotResolver).resolve method.
+	dialer := newDialer(net.JoinHostPort(bootstrapDNS, "53"))
+	dnsClient := &dns.Client{
+		Net:    "udp",
+		Dialer: dialer,
+	}
+	answer, _, err := dnsClient.ExchangeContext(ctx, msg, r.endpoint)
+	return answer, err
+}
+
+// canonicalName returns canonical name from FQDN with "." trimmed.
+func canonicalName(fqdn string) string {
+	q := strings.TrimSpace(fqdn)
+	q = strings.TrimSuffix(q, ".")
+	// https://datatracker.ietf.org/doc/html/rfc4343
+	q = strings.ToLower(q)
+
+	return q
+}
diff --git a/testhelper/config.go b/testhelper/config.go
new file mode 100644
index 0000000..fe548fc
--- /dev/null
+++ b/testhelper/config.go
@@ -0,0 +1,72 @@
+package testhelper
+
+import (
+	"strings"
+	"testing"
+
+	"github.com/Control-D-Inc/ctrld"
+	"github.com/spf13/viper"
+	"github.com/stretchr/testify/require"
+)
+
+func SampleConfig(t *testing.T) *ctrld.Config {
+	v := viper.NewWithOptions(viper.KeyDelimiter("::"))
+	ctrld.InitConfig(v, "test_load_config")
+	require.NoError(t, v.ReadConfig(strings.NewReader(sampleConfigContent)))
+	var cfg ctrld.Config
+	require.NoError(t, v.Unmarshal(&cfg))
+	return &cfg
+}
+
+var sampleConfigContent = `
+[service]
+log_level = "info"
+log_path = "/path/to/log.log"
+
+[network.0]
+name = "Home Wifi"
+cidrs = ["192.168.0.0/24"]
+
+[network.1]
+name = "Kids Wifi"
+cidrs = ["192.168.1.0/24"]
+
+[upstream.0]
+name = "Control D - Standard Devices"
+type = "doh"
+endpoint = "https://dns.controld.com/12345abcd/main-device"
+timeout = 5
+
+[upstream.1]
+name = "Control D - Kids Devices"
+type = "dot"
+endpoint = "12345abcd-kids-devices.dns.controld.com"
+timeout = 5
+
+[upstream.2]
+name = "Google"
+type = "legacy"
+endpoint = "8.8.8.8"
+timeout = 5
+
+[listener.0]
+ip = "127.0.0.1"
+port = 53
+
+[listener.1]
+ip = "10.10.42.69"
+port = 1337
+
+[listener.0.policy]
+name = "My Policy"
+networks = [
+    {"network.0" = ["upstream.1", "upstream.0"]},
+    {"network.1" = ["upstream.0"]},
+    {"network.2" = ["upstream.1"]},
+]
+
+rules = [
+    {"*.ru"         = ["upstream.1"]},
+    {"*.local.host" = ["upstream.2", "upstream.0"]},
+]
+`