147 lines
3.5 KiB
Go
147 lines
3.5 KiB
Go
package handler
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import (
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"encoding/base64"
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"fmt"
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"net"
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"os/exec"
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"strings"
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"time"
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"github.com/gin-gonic/gin"
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)
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func handleDns(c *gin.Context, url string, params map[string]interface{}) {
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// 获取seq参数
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seq := ""
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if seqVal, ok := params["seq"].(string); ok {
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seq = seqVal
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}
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// 获取dig类型参数
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digType := ""
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if dt, ok := params["dt"].(string); ok {
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digType = dt
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}
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// 获取DNS服务器参数
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dnsServer := ""
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if ds, ok := params["ds"].(string); ok {
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dnsServer = ds
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}
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// 解析URL，提取hostname
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hostname := url
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if strings.HasPrefix(url, "http://") || strings.HasPrefix(url, "https://") {
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parts := strings.Split(url, "//")
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if len(parts) > 1 {
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hostParts := strings.Split(parts[1], "/")
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hostname = hostParts[0]
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if idx := strings.Index(hostname, ":"); idx != -1 {
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hostname = hostname[:idx]
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}
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}
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}
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// 准备结果
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result := map[string]interface{}{
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"seq": seq,
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"type": "ceDns",
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"requrl": hostname,
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"ips": []interface{}{},
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}
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// 构建dig命令
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args := []string{hostname}
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if digType != "" {
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args = append([]string{"-t", digType}, args...)
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}
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if dnsServer != "" {
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args = append([]string{"@" + dnsServer}, args...)
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}
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cmd := exec.Command("dig", args...)
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output, err := cmd.CombinedOutput()
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outputStr := string(output)
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// 编码完整输出为base64（header字段）
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result["header"] = base64.StdEncoding.EncodeToString([]byte(outputStr))
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if err != nil {
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result["error"] = err.Error()
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c.JSON(200, result)
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return
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}
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// 解析dig输出
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lines := strings.Split(outputStr, "\n")
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inAnswerSection := false
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ipList := make([]map[string]interface{}, 0)
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for _, line := range lines {
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line = strings.TrimSpace(line)
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if strings.Contains(line, "ANSWER SECTION") {
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inAnswerSection = true
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continue
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}
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if inAnswerSection {
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if line == "" {
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break
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}
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// 解析dig输出行，格式如：example.com. 300 IN A 192.168.1.1
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// 或者：www.baidu.com. 1038 IN CNAME www.a.shifen.com.
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parts := strings.Fields(line)
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if len(parts) >= 5 {
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// parts[3] 是 "IN" (record type)，parts[4] 是记录类型 (A, AAAA, CNAME等)
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recordClass := parts[4] // A, AAAA, CNAME等
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recordValue := ""
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if len(parts) > 5 {
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recordValue = strings.Join(parts[5:], " ")
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// 移除CNAME值末尾的点（如果有）
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recordValue = strings.TrimSuffix(recordValue, ".")
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}
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// 处理A、AAAA和CNAME记录
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if recordClass == "A" || recordClass == "AAAA" || recordClass == "CNAME" {
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recordItem := map[string]interface{}{
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"url": strings.TrimSuffix(parts[0], "."), // 移除域名末尾的点
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"type": recordClass,
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"ip": recordValue, // CNAME记录中，ip字段存储的是CNAME值
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}
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ipList = append(ipList, recordItem)
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}
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}
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}
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}
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// 如果没有从dig输出解析到IP，尝试使用net.LookupIP
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if len(ipList) == 0 {
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start := time.Now()
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ips, err := net.LookupIP(hostname)
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lookupTime := time.Since(start)
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if err == nil {
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for _, ip := range ips {
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ipType := "A"
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if ip.To4() == nil {
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ipType = "AAAA"
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}
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ipItem := map[string]interface{}{
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"url": hostname,
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"type": ipType,
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"ip": ip.String(),
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}
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ipList = append(ipList, ipItem)
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}
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// 更新header，包含lookup时间信息
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lookupInfo := fmt.Sprintf("Lookup time: %v\n", lookupTime)
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result["header"] = base64.StdEncoding.EncodeToString([]byte(outputStr + lookupInfo))
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} else {
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result["error"] = err.Error()
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}
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}
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result["ips"] = ipList
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c.JSON(200, result)
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}
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