使用 curl 獲取 DNS 結果

介紹如何使用 curl 命令獲取 DNS 查詢結果的兩種格式。
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本文介紹兩種利用 curl 獲取 DNS 查詢結果的方法：

  1. DNS JSON 格式
  2. DNS Wire Format 格式

1. DNS JSON 格式查詢

返回 JSON 格式的 DNS 響應，便於解析。

Google

curl -H 'accept: application/dns-json' "https://dns.google/resolve?name=baidu.com&type=A" | jq .

Cloudflare

curl -H 'accept: application/dns-json' 'https://cloudflare-dns.com/dns-query?name=baidu.com&type=A' | jq .

Aliyun

curl -H "accept: application/dns-json" "https://223.5.5.5/resolve?name=baidu.com&type=1" | jq .

dns.pub

curl -H 'accept: application/dns-json' 'https://doh.dns.pub/dns-query?name=baidu.com&type=A' | jq .

AdGuard Private DNS

# 暫不受支援

2. DNS Wire Format 格式查詢

返回二進制格式的 DNS 響應，需要進一步解析。

Google

curl -H 'accept: application/dns-message' 'https://dns.google/dns-query?dns=q80BAAABAAAAAAAAA3d3dwdleGFtcGxlA2NvbQAAAQAB'  | hexdump -c

Cloudflare

curl -H 'accept: application/dns-message' 'https://cloudflare-dns.com/dns-query?dns=q80BAAABAAAAAAAAA3d3dwdleGFtcGxlA2NvbQAAAQAB'  | hexdump -c

Aliyun

curl -H 'accept: application/dns-message' "https://dns.alidns.com/dns-query?dns=P8QBAAABAAAAAAAABWJhaWR1A2NvbQAAAQAB"  | hexdump -c

dns.pub

curl -H 'accept: application/dns-message' 'https://doh.dns.pub/dns-query?dns=q80BAAABAAAAAAAAA3d3dwdleGFtcGxlA2NvbQAAAQAB'  | hexdump -c

AdGuard Private DNS

curl -H 'accept: application/dns-message' 'https://public0.adguardprivate.com/dns-query?dns=q80BAAABAAAAAAAAA3d3dwdleGFtcGxlA2NvbQAAAQAB'  | hexdump -c

使用 Python 解析 DNS 響應

# pip install dnspython
# pip install requests
# 解析 JSON 格式響應
import json
import requests

def query_dns_json(domain="example.com", type="A"):
  """使用 JSON 格式查詢 DNS"""
  url = "https://dns.google/resolve"
  params = {"name": domain, "type": type}
  headers = {"accept": "application/dns-json"}

  response = requests.get(url, params=params, headers=headers)
  return json.dumps(response.json(), indent=2)

# 解析 Wire Format 響應
def query_dns_wire(domain="example.com"):
  """使用 Wire Format 格式查詢 DNS"""
  import dns.message
  import requests
  import base64

  # 創建DNS查詢消息
  query = dns.message.make_query(domain, 'A')
  wire_format = query.to_wire()
  dns_query = base64.b64encode(wire_format).decode('utf-8')

  # 發送請求
  url = "https://dns.google/dns-query"
  params = {"dns": dns_query}
  headers = {"accept": "application/dns-message"}

  response = requests.get(url, params=params, headers=headers)
  dns_response = dns.message.from_wire(response.content)
  return str(dns_response)

if __name__ == "__main__":
  print("JSON格式查詢結果:")
  print(query_dns_json())
  print("\nWire Format查詢結果:")
  print(query_dns_wire())

生成 DNS Wire Format Base64 編碼的數據

# pip install dnspython
import base64
import dns.message
import dns.rdatatype

# 創建一個DNS查詢消息
query = dns.message.make_query('example.com', dns.rdatatype.A)

# 將消息轉換為Wire Format
wire_format = query.to_wire()

# 轉為base64
wire_format_base64 = base64.b64encode(wire_format).decode('utf-8')

# 打印
print(wire_format_base64)