From 045c1b19040afa3887c83a725c11a99e158ad159 Mon Sep 17 00:00:00 2001 From: paspo Date: Mon, 24 Mar 2025 14:40:12 +0100 Subject: [PATCH] dns proxy --- Dockerfile | 10 +++ README.md | 10 +++ rootfs/app/entrypoint.sh | 8 +++ src/cmd/.gitignore | 1 + src/cmd/main.go | 136 +++++++++++++++++++++++++++++++++++++++ src/go.mod | 34 ++++++++++ src/go.sum | 89 +++++++++++++++++++++++++ 7 files changed, 288 insertions(+) create mode 100644 src/cmd/.gitignore create mode 100644 src/cmd/main.go create mode 100644 src/go.mod create mode 100644 src/go.sum diff --git a/Dockerfile b/Dockerfile index be3b4b8..6ae005b 100644 --- a/Dockerfile +++ b/Dockerfile @@ -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 diff --git a/README.md b/README.md index a20122a..a9f13b5 100644 --- 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 diff --git a/rootfs/app/entrypoint.sh b/rootfs/app/entrypoint.sh index 3b46893..078f0be 100755 --- 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 diff --git a/src/cmd/.gitignore b/src/cmd/.gitignore new file mode 100644 index 0000000..8fcbb00 --- /dev/null +++ b/src/cmd/.gitignore @@ -0,0 +1 @@ +__debug* \ No newline at end of file diff --git a/src/cmd/main.go b/src/cmd/main.go new file mode 100644 index 0000000..d70cec9 --- /dev/null +++ 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") +} diff --git a/src/go.mod b/src/go.mod new file mode 100644 index 0000000..84ad8e4 --- /dev/null +++ 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 +) diff --git a/src/go.sum b/src/go.sum new file mode 100644 index 0000000..7f08abb --- /dev/null +++ b/src/go.sum @@ -0,0 +1,89 @@ +github.com/bytedance/sonic v1.11.6 h1:oUp34TzMlL+OY1OUWxHqsdkgC/Zfc85zGqw9siXjrc0= +github.com/bytedance/sonic v1.11.6/go.mod h1:LysEHSvpvDySVdC2f87zGWf6CIKJcAvqab1ZaiQtds4= +github.com/bytedance/sonic/loader v0.1.1 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