feat: support custom DNS server for manual DNS mode when applying certificates

agent/utils/ssl/manual_client.go

@@ -12,6 +12,7 @@ import (
 	"fmt"
 	"github.com/1Panel-dev/1Panel/agent/app/model"
 	"github.com/go-acme/lego/v4/certificate"
+	"github.com/miekg/dns"
 	"golang.org/x/crypto/acme"
 	"log"
 	"net"
@@ -123,7 +124,7 @@ func queryDNSRecords(domain string) (map[string]string, error) {
 	return records, nil
 }
 
-func (c *ManualClient) handleAuthorization(ctx context.Context, authzURL string) error {
+func (c *ManualClient) handleAuthorization(ctx context.Context, authzURL string, nameservers []string) error {
 	authz, err := c.client.GetAuthorization(ctx, authzURL)
 	if err != nil {
 		return fmt.Errorf("failed to get authorization: %v", err)
@@ -158,9 +159,22 @@ func (c *ManualClient) handleAuthorization(ctx context.Context, authzURL string)
 
 	for {
 		c.logger.Printf("[INFO] [%s] acme: Checking DNS record propagation.", domain)
-		currentRecords, err := queryDNSRecords(domain)
-		if err != nil {
-			return fmt.Errorf("failed to query DNS records: %v", err)
+		var currentRecords map[string]string
+		var queryErr error
+		if len(nameservers) == 0 {
+			currentRecords, queryErr = queryDNSRecords(domain)
+		} else {
+			var errs []string
+			for _, nameserver := range nameservers {
+				currentRecords, queryErr = queryDNSRecordsWithResolver(ctx, c.logger, domain, nameserver)
+				errs = append(errs, fmt.Sprintf("%s: %v", nameserver, queryErr))
+			}
+			if queryErr != nil && len(errs) > 0 {
+				queryErr = fmt.Errorf("all nameservers failed: %s", strings.Join(errs, "; "))
+			}
+		}
+		if currentRecords == nil && queryErr != nil {
+			return fmt.Errorf("failed to query DNS records: %v", queryErr)
 		}
 		recordName := fmt.Sprintf("_acme-challenge.%s", domain)
 		providedRecord, exists := currentRecords[recordName]
@@ -262,7 +276,7 @@ func (c *ManualClient) RequestCertificate(ctx context.Context, websiteSSL *model
 	defer delete(Orders, websiteSSL.ID)
 
 	for _, authzURL := range order.AuthzURLs {
-		if err := c.handleAuthorization(ctx, authzURL); err != nil {
+		if err := c.handleAuthorization(ctx, authzURL, getNameservers(*websiteSSL)); err != nil {
 			return res, err
 		}
 	}
@@ -306,3 +320,73 @@ func (c *ManualClient) RequestCertificate(ctx context.Context, websiteSSL *model
 	}
 	return resource, nil
 }
+
+func getNameservers(websiteSSL model.WebsiteSSL) []string {
+	var nameservers []string
+	if websiteSSL.Nameserver1 != "" {
+		nameservers = append(nameservers, handleNameserver(websiteSSL.Nameserver1))
+	}
+	if websiteSSL.Nameserver2 != "" {
+		nameservers = append(nameservers, handleNameserver(websiteSSL.Nameserver2))
+	}
+	return nameservers
+}
+
+func handleNameserver(nameserver string) string {
+	if strings.Contains(nameserver, ":") {
+		return nameserver
+	}
+	return fmt.Sprintf("%s:53", nameserver)
+}
+
+func queryDNSRecordsWithResolver(ctx context.Context, logger *log.Logger, domain string, dnsServer string) (map[string]string, error) {
+	recordName := fmt.Sprintf("_acme-challenge.%s", domain)
+	c := new(dns.Client)
+	c.Timeout = 10 * time.Second
+	c.Net = "udp"
+
+	m := new(dns.Msg)
+	m.SetQuestion(dns.Fqdn(recordName), dns.TypeTXT)
+	m.RecursionDesired = true
+
+	r, _, err := c.ExchangeContext(ctx, m, dnsServer)
+	if isNetworkError(err) {
+		logger.Printf("[WARN] Network error occurred while querying DNS: %v", err)
+		return nil, nil
+	}
+	if err != nil {
+		return nil, fmt.Errorf("DNS query failed: %w", err)
+	}
+
+	if r.Rcode == dns.RcodeNameError {
+		logger.Printf("[INFO] DNS record does not exist yet (NXDOMAIN)")
+		return nil, nil
+	}
+
+	if r.Rcode != dns.RcodeSuccess {
+		return nil, fmt.Errorf("DNS query failed with code: %s", dns.RcodeToString[r.Rcode])
+	}
+
+	records := make(map[string]string)
+
+	for _, answer := range r.Answer {
+		if txt, ok := answer.(*dns.TXT); ok {
+			if len(txt.Txt) > 0 {
+				records[recordName] = txt.Txt[0]
+				break
+			}
+		}
+	}
+
+	return records, nil
+}
+
+func isNetworkError(err error) bool {
+	if err == nil {
+		return false
+	}
+	return strings.Contains(err.Error(), "i/o timeout") ||
+		strings.Contains(err.Error(), "connection refused") ||
+		strings.Contains(err.Error(), "network is unreachable") ||
+		strings.Contains(err.Error(), "no route to host")
+}