dns: log error when adding an invalid record

.github/workflows/build.yml

@@ -25,15 +25,15 @@ jobs:
       - name: Set Vars
         run: |
           echo "SHA_SHORT=$(git rev-parse --short HEAD)" >> $GITHUB_ENV
-          echo "GO_VERSION=$(grep -P "go \d+\." go.mod | cut -d " " -f2)" >> $GITHUB_ENV
+          echo "GO_MOD_VERSION=$(grep -P "go \d+\." go.mod | cut -d " " -f2)" >> $GITHUB_ENV
 
       - name: Set up Go
         uses: actions/setup-go@v2
         with:
           stable: false
           check-latest: true
-          go-version: '1.18.0-beta2'
-          # go-version: ${{ env.GO_VERSION}}
+          go-version: '1.18.0-rc1'
+          # go-version: ${{ env.GO_MOD_VERSION}}
 
       - name: Set up Cache
         uses: actions/cache@v2

README.md

@@ -82,7 +82,9 @@ we can set up local listeners as proxy servers, and forward requests to internet
 - Docker: `docker pull nadoo/glider`
 - ArchLinux: `sudo pacman -S glider`
 
-## Run
+## Usage
+
+**Run:**
 
 ```bash
 glider -config CONFIG_PATH
@@ -91,13 +93,8 @@ glider -config CONFIG_PATH
 glider -verbose -listen :8443 -forward SCHEME://HOST:PORT
 ```
 
-## Usage
+**Show help:**  `glider -help`
 
-**Show help:**
-
-```bash
-glider -help
-```
 <details>
 <summary>click to see details</summary>
 
@@ -225,11 +222,8 @@ glider 0.16.0, https://github.com/nadoo/glider
 
 </details>
 
-**Show Schemes:**
+**Show Schemes:** `glider -scheme all`
 
-```bash
-glider -scheme all
-```
 <details>
 <summary>click to see details</summary>
 
@@ -343,11 +337,7 @@ TLS and Websocket with a specified proxy protocol:
 
 </details>
 
-**Show Examples:**
-
-```bash
-glider -example
-```
+**Show Examples:** `glider -example`
 
 <details>
 <summary>click to see details</summary>

dns/client.go

@@ -2,6 +2,7 @@ package dns
 
 import (
 	"encoding/binary"
+	"errors"
 	"io"
 	"net"
 	"net/netip"
@@ -52,7 +53,9 @@ func NewClient(proxy proxy.Proxy, config *Config) (*Client, error) {
 
 	// custom records
 	for _, record := range config.Records {
-		c.AddRecord(record)
+		if err := c.AddRecord(record); err != nil {
+			log.F("[dns] add record '%s' error: %s", record, err)
+		}
 	}
 
 	return c, nil
@@ -283,8 +286,10 @@ func (c *Client) AddHandler(h AnswerHandler) {
 // AddRecord adds custom record to dns cache, format:
 // www.example.com/1.2.3.4 or www.example.com/2606:2800:220:1:248:1893:25c8:1946
 func (c *Client) AddRecord(record string) error {
-	r := strings.Split(record, "/")
-	domain, ip := r[0], r[1]
+	domain, ip, found := strings.Cut(record, "/")
+	if !found {
+		return errors.New("wrong record format, must contain '/'")
+	}
 	m, err := MakeResponse(domain, ip, uint32(c.config.MaxTTL))
 	if err != nil {
 		log.F("[dns] add custom record error: %s", err)

go.mod

@@ -9,7 +9,7 @@ require (
 	github.com/dgryski/go-rc2 v0.0.0-20150621095337-8a9021637152
 	github.com/insomniacslk/dhcp v0.0.0-20220119180841-3c283ff8b7dd
 	github.com/nadoo/conflag v0.3.1
-	github.com/nadoo/ipset v0.4.1-0.20220214103201-761217ee1ee0
+	github.com/nadoo/ipset v0.4.1-0.20220218075046-ca3cdce74266
 	github.com/xtaci/kcp-go/v5 v5.6.1
 	golang.org/x/crypto v0.0.0-20220214200702-86341886e292
 	golang.org/x/sys v0.0.0-20220209214540-3681064d5158

go.sum

@@ -67,8 +67,8 @@ github.com/mdlayher/raw v0.0.0-20211126142749-4eae47f3d54b/go.mod h1:7EpbotpCmVZ
 github.com/mmcloughlin/avo v0.0.0-20200803215136-443f81d77104/go.mod h1:wqKykBG2QzQDJEzvRkcS8x6MiSJkF52hXZsXcjaB3ls=
 github.com/nadoo/conflag v0.3.1 h1:4pHkLIz8PUsfg6ajNYRRSY3bt6m2LPsu6KOzn5uIXQw=
 github.com/nadoo/conflag v0.3.1/go.mod h1:dzFfDUpXdr2uS2oV+udpy5N2vfNOu/bFzjhX1WI52co=
-github.com/nadoo/ipset v0.4.1-0.20220214103201-761217ee1ee0 h1:i81BROp7xvMIkR1KpLwERTrRVgwwFAN0prz1kQmz9RE=
-github.com/nadoo/ipset v0.4.1-0.20220214103201-761217ee1ee0/go.mod h1:rYF5DQLRGGoQ8ZSWeK+6eX5amAuPqwFkWjhQlEITGJQ=
+github.com/nadoo/ipset v0.4.1-0.20220218075046-ca3cdce74266 h1:lv9VKGAyAQAyS3lQoznfWoXYJD2C8/PITORX5r7f5rk=
+github.com/nadoo/ipset v0.4.1-0.20220218075046-ca3cdce74266/go.mod h1:rYF5DQLRGGoQ8ZSWeK+6eX5amAuPqwFkWjhQlEITGJQ=
 github.com/pkg/errors v0.9.1 h1:FEBLx1zS214owpjy7qsBeixbURkuhQAwrK5UwLGTwt4=
 github.com/pkg/errors v0.9.1/go.mod h1:bwawxfHBFNV+L2hUp1rHADufV3IMtnDRdf1r5NINEl0=
 github.com/pmezard/go-difflib v1.0.0 h1:4DBwDE0NGyQoBHbLQYPwSUPoCMWR5BEzIk/f1lZbAQM=

main.go

@@ -63,6 +63,10 @@ func main() {
 		}
 	}
 
+	for _, r := range config.rules {
+		r.IP, r.CIDR, r.Domain = nil, nil, nil
+	}
+
 	// enable checkers
 	pxy.Check()
 

proxy/tls/tls.go

@@ -58,13 +58,14 @@ func NewTLS(s string, d proxy.Dialer, p proxy.Proxy) (*TLS, error) {
 		alpn:       query["alpn"],
 	}
 
+	if t.addr != "" {
 		if _, port, _ := net.SplitHostPort(t.addr); port == "" {
 			t.addr = net.JoinHostPort(t.addr, "443")
 		}
-
 		if t.serverName == "" {
 			t.serverName = t.addr[:strings.LastIndex(t.addr, ":")]
 		}
+	}
 
 	return t, nil
 }

service/dhcpd/dhcpd.go

@@ -66,10 +66,9 @@ func (*dpcpd) Run(args ...string) {
 
 	// static ips
 	for _, host := range args[4:] {
-		pair := strings.Split(host, "=")
-		if len(pair) == 2 {
-			if mac, err := net.ParseMAC(pair[0]); err == nil {
-				if ip, err := netip.ParseAddr(pair[1]); err == nil {
+		if mac, ip, ok := strings.Cut(host, "="); ok {
+			if mac, err := net.ParseMAC(mac); err == nil {
+				if ip, err := netip.ParseAddr(ip); err == nil {
 					pool.LeaseStaticIP(mac, ip)
 				}
 			}