dns proxy

2025-03-24 14:40:12 +01:00 · 2025-03-24 14:40:12 +01:00 · 045c1b1904
commit 045c1b1904
parent 1600112965
7 changed files with 288 additions and 0 deletions
--- a/10
+++ b/10
@ -1,3 +1,12 @@
+FROM golang:1.22.1-alpine AS build
+
+WORKDIR /src
+COPY src /src
+RUN \
+  go mod download && \
+  CGO_ENABLED=0 GOOS=linux go build -a -o /dnsproxy cmd/main.go
+
+
 FROM alpine:latest

 RUN \
@ -6,6 +15,7 @@ RUN \
  wget -O /etc/unbound/named.cache ftp://ftp.internic.net//domain/named.cache

 COPY rootfs /
+COPY --from=build /dnsproxy /app/

 HEALTHCHECK --interval=30s --start-period=5s --timeout=10s \
  CMD /usr/bin/host -T -p 1053 asperti.com 127.0.0.1
--- a/README.md
+++ b/README.md
@ -14,6 +14,16 @@ services:
    ports:
      - 127.0.0.1:1053:1053
      - 127.0.0.1:1053:1053/udp
+      - 127.0.0.1:8000:8000  # dns proxy
+    environment:
+      LOGS: true
+      LOGDIR: /logs
+      PORT: 1053
+      VERBOSITY: 1
+      DNSPROXY: true
+      ACCESSLOG: true
+    volumes:
+      - ./logs:/logs
 ```

 ## Usage with docker
--- a/rootfs/app/entrypoint.sh
+++ b/rootfs/app/entrypoint.sh
@ -4,6 +4,8 @@ LOGS=${LOGS:-false}
 LOGDIR=${LOGDIR:-/logs}
 PORT=${PORT:-1053}
 VERBOSITY=${VERBOSITY:-1}
+DNSPROXY=${DNSPROXY:-false}
+ACCESSLOG=${ACCESSLOG:-true}

 # set logs
 if [ "${LOGS}" = true ] ; then
@ -35,5 +37,11 @@ server:
    port: ${PORT}
 EOF

+if [ "${DNSPROXY}" = true ] ; then
+    export DNS_SERVER=127.0.0.1
+    export DNS_PORT="${PORT}"
+    /app/dnsproxy &
+fi
+
 # start unbound
 /usr/sbin/unbound -d
--- a/src/cmd/.gitignore
+++ b/src/cmd/.gitignore
@ -0,0 +1 @@
+__debug*
--- a/src/cmd/main.go
+++ b/src/cmd/main.go
@ -0,0 +1,136 @@
+package main
+
+import (
+	"context"
+	"errors"
+	"net"
+	"net/http"
+	"os"
+	"slices"
+	"strings"
+	"time"
+
+	"github.com/gin-gonic/gin"
+)
+
+var Resolver *net.Resolver
+
+func LookupIP(c *gin.Context) {
+	var err error
+	var ips []net.IP
+	q := c.Param("q")
+	ips, err = Resolver.LookupIP(context.Background(), "ip4", q)
+	c.JSON(http.StatusOK, gin.H{"ips": ips, "err": err})
+}
+
+type RBLLookupIPRequest struct {
+	RBLServer string `json:"rblserver"`
+}
+
+func RBLLookupIP(c *gin.Context) {
+	var err error
+	var dnsErr *net.DNSError
+	var listed string
+
+	ip := c.Param("ip")
+	ipAddress := net.ParseIP(ip)
+
+	// check if valid
+	if ipAddress.To4() == nil {
+		c.JSON(http.StatusBadRequest, gin.H{"error": "invalid IP address"})
+		return
+	}
+
+	// get requested data
+	var req RBLLookupIPRequest
+	err = c.BindJSON(&req)
+	if err != nil {
+		c.JSON(http.StatusBadRequest, gin.H{"error": "invalid request body"})
+		return
+	}
+
+	// reverse the ip
+	s := strings.Split(ipAddress.String(), ".")
+	slices.Reverse(s)
+
+	// and add the rbl server
+	s = append(s, req.RBLServer)
+
+	// final query
+	q := strings.Join(s, ".")
+	_, err = Resolver.LookupIP(context.Background(), "ip4", q)
+
+	listed = "listed"
+	if err == nil {
+		c.JSON(http.StatusOK, gin.H{"status": listed, "query": q})
+		return
+	}
+
+	if !errors.As(err, &dnsErr) {
+		c.JSON(http.StatusRequestTimeout, gin.H{"error": err.Error()})
+		return
+	}
+
+	if dnsErr.IsTimeout {
+		c.JSON(http.StatusRequestTimeout, gin.H{"error": "timeout", "query": q})
+		return
+	}
+
+	if dnsErr.IsTemporary {
+		c.JSON(http.StatusRequestTimeout, gin.H{"error": "temporary error", "query": q})
+		return
+	}
+
+	if !dnsErr.IsNotFound {
+		c.JSON(http.StatusRequestTimeout, gin.H{"error": "temporary error", "query": q})
+		return
+	}
+
+	if dnsErr.IsNotFound {
+		listed = "not listed"
+	}
+
+	c.JSON(http.StatusOK, gin.H{"status": listed, "query": q})
+}
+
+func initResolver() {
+	DNS_SERVER := os.Getenv("DNS_SERVER")
+	DNS_PORT := os.Getenv("DNS_PORT")
+
+	if DNS_SERVER == "" {
+		DNS_SERVER = "127.0.0.1"
+	}
+
+	if DNS_PORT == "" {
+		DNS_PORT = "53"
+	}
+
+	Resolver = &net.Resolver{
+		PreferGo: false,
+		Dial: func(ctx context.Context, network, address string) (net.Conn, error) {
+			d := net.Dialer{
+				Timeout: time.Millisecond * time.Duration(10000),
+			}
+			return d.DialContext(ctx, network, DNS_SERVER+":"+DNS_PORT)
+		},
+	}
+}
+
+var Router *gin.Engine
+
+func init() {
+	initResolver()
+	Router = gin.Default()
+
+	accesslog := os.Getenv("ACCESSLOG")
+	if accesslog == "false" {
+		Router = gin.New()
+	}
+
+	Router.GET("/ip4/:q", LookupIP)
+	Router.POST("/rbl/:ip", RBLLookupIP)
+}
+
+func main() {
+	Router.Run(":8000")
+}
--- a/src/go.mod
+++ b/src/go.mod
@ -0,0 +1,34 @@
+module asperti.com/dnsproxy
+
+go 1.22.1
+
+require github.com/gin-gonic/gin v1.10.0
+
+require (
+	github.com/bytedance/sonic v1.11.6 // indirect
+	github.com/bytedance/sonic/loader v0.1.1 // indirect
+	github.com/cloudwego/base64x v0.1.4 // indirect
+	github.com/cloudwego/iasm v0.2.0 // indirect
+	github.com/gabriel-vasile/mimetype v1.4.3 // indirect
+	github.com/gin-contrib/sse v0.1.0 // indirect
+	github.com/go-playground/locales v0.14.1 // indirect
+	github.com/go-playground/universal-translator v0.18.1 // indirect
+	github.com/go-playground/validator/v10 v10.20.0 // indirect
+	github.com/goccy/go-json v0.10.2 // indirect
+	github.com/json-iterator/go v1.1.12 // indirect
+	github.com/klauspost/cpuid/v2 v2.2.7 // indirect
+	github.com/leodido/go-urn v1.4.0 // indirect
+	github.com/mattn/go-isatty v0.0.20 // indirect
+	github.com/modern-go/concurrent v0.0.0-20180306012644-bacd9c7ef1dd // indirect
+	github.com/modern-go/reflect2 v1.0.2 // indirect
+	github.com/pelletier/go-toml/v2 v2.2.2 // indirect
+	github.com/twitchyliquid64/golang-asm v0.15.1 // indirect
+	github.com/ugorji/go/codec v1.2.12 // indirect
+	golang.org/x/arch v0.8.0 // indirect
+	golang.org/x/crypto v0.23.0 // indirect
+	golang.org/x/net v0.25.0 // indirect
+	golang.org/x/sys v0.20.0 // indirect
+	golang.org/x/text v0.15.0 // indirect
+	google.golang.org/protobuf v1.34.1 // indirect
+	gopkg.in/yaml.v3 v3.0.1 // indirect
+)
--- a/src/go.sum
+++ b/src/go.sum
@ -0,0 +1,89 @@
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