initial commit

.gitignore

@@ -0,0 +1,2 @@
+nc.conf
+ncddns

go.mod

@@ -0,0 +1,3 @@
+module ncddns
+
+go 1.18

main.go

@@ -0,0 +1,113 @@
+package main
+
+import (
+	"flag"
+	"fmt"
+	"io"
+	"io/ioutil"
+	"net/http"
+	"net/url"
+	"os"
+	"strings"
+)
+
+const (
+	baseURL = "https://dynamicdns.park-your-domain.com/update?"
+)
+
+type DomainTuple struct {
+	Domain   string
+	Password string
+}
+
+func Config(path string) ([]DomainTuple, error) {
+	conf, err := ioutil.ReadFile(path)
+	if err != nil {
+		return nil, fmt.Errorf("read conf: %w", err)
+	}
+	tuples := []DomainTuple{}
+	for _, line := range strings.Split(string(conf), "\n") {
+		line := strings.TrimSpace(line)
+		if !strings.Contains(line, "=") {
+			continue
+		}
+		parts := strings.SplitN(line, "=", 2)
+		if len(parts) != 2 {
+			continue
+		}
+		tuples = append(tuples, DomainTuple{
+			Domain:   parts[0],
+			Password: parts[1],
+		})
+	}
+	return tuples, nil
+}
+
+func fatal(name string, err error) {
+	if err != nil {
+		fmt.Fprintln(os.Stderr, name, err.Error())
+		os.Exit(1)
+	}
+}
+
+func main() {
+	cfgPath := flag.String("config", "nc.conf", "config file path")
+	flag.Parse()
+
+	ip, err := IP()
+	if err != nil {
+		fatal("ip", err)
+	}
+	cfg, err := Config(*cfgPath)
+	if err != nil {
+		fatal("config", err)
+	}
+	for _, cfgEntry := range cfg {
+		fmt.Println(cfgEntry.Domain)
+		if err := Set(ip, cfgEntry.Domain, cfgEntry.Password, "*"); err != nil {
+			fatal(cfgEntry.Domain, err)
+		}
+		if err := Set(ip, cfgEntry.Domain, cfgEntry.Password, "@"); err != nil {
+			fatal(cfgEntry.Domain, err)
+		}
+	}
+}
+
+func IP() (string, error) {
+	resp, err := http.Get("https://ipv4.icanhazip.com")
+	if err != nil {
+		return "", fmt.Errorf("get ip: %w", err)
+	}
+	defer resp.Body.Close()
+
+	body, err := io.ReadAll(resp.Body)
+	if err != nil {
+		return "", fmt.Errorf("read body: %w", err)
+	}
+
+	return string(body), nil
+}
+
+func Set(ip, domain, password, host string) error {
+	params := url.Values{}
+	params.Add("host", host)
+	params.Add("domain", domain)
+	params.Add("password", password)
+	params.Add("ip", ip)
+
+	resp, err := http.Get(fmt.Sprintf("%s%s", baseURL, params.Encode()))
+	if err != nil {
+		return fmt.Errorf("request: %w", err)
+	}
+	defer resp.Body.Close()
+
+	data, err := io.ReadAll(resp.Body)
+	if err != nil {
+		return fmt.Errorf("read body: %w", err)
+	}
+
+	if resp.StatusCode != http.StatusOK {
+		fmt.Fprintf(os.Stderr, "got status [%d]: %s\n", resp.StatusCode, string(data))
+	}
+	return nil
+}