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xmz7891
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92 lines
3.1 KiB
Bash
92 lines
3.1 KiB
Bash
#!/bin/bash
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# 查 api.cloudflare.com 到底该用哪个 IP。
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#
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# 现在钉的 104.16.132.229 返回的是 Cloudflare 错误页（error 1034），
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# 说明这个 IP 不对 —— 我当初是随便挑的一个 Cloudflare 网段地址。
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set -u
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echo "===== 1. 当前响应内容到底是什么 ====="
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curl -4 -s -D /tmp/h.txt -o /tmp/b.txt https://api.cloudflare.com/client/v4/user 2>/dev/null
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echo " 响应头前几行:"
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head -8 /tmp/h.txt | sed 's/^/ /'
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echo
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echo " 响应体前 300 字节:"
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head -c 300 /tmp/b.txt | sed 's/^/ /'
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echo
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echo
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echo "===== 2. 用公共 DNS 查真实 IP（绕开本地解析）====="
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for dns in 1.1.1.1 8.8.8.8 223.5.5.5; do
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echo " --- 经 $dns ---"
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timeout 8 getent ahostsv4 api.cloudflare.com >/dev/null 2>&1
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# 用 python 发 DNS 查询（设备上不一定有 dig/nslookup）
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python3 - "$dns" <<'PY' 2>/dev/null || echo " （查不了）"
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import socket, struct, sys
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dns = sys.argv[1]
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name = "api.cloudflare.com"
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# 手搓一个 DNS A 查询
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tid = 0x1234
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flags = 0x0100
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q = struct.pack(">HHHHHH", tid, flags, 1, 0, 0, 0)
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for part in name.split("."):
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q += bytes([len(part)]) + part.encode()
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q += b"\x00" + struct.pack(">HH", 1, 1)
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s = socket.socket(socket.AF_INET, socket.SOCK_DGRAM)
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s.settimeout(5)
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try:
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s.sendto(q, (dns, 53))
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data, _ = s.recvfrom(2048)
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except Exception as exc:
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print(f" 查询失败: {exc}")
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raise SystemExit
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# 跳过 header + question
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idx = 12
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while data[idx] != 0:
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idx += data[idx] + 1
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idx += 5
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ancount = struct.unpack(">H", data[6:8])[0]
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found = []
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for _ in range(ancount):
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if data[idx] & 0xC0:
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idx += 2
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else:
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while data[idx] != 0:
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idx += data[idx] + 1
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idx += 1
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rtype, _cls, _ttl, rdlen = struct.unpack(">HHIH", data[idx:idx+10])
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idx += 10
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if rtype == 1 and rdlen == 4:
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found.append(".".join(str(b) for b in data[idx:idx+4]))
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idx += rdlen
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print(" " + (", ".join(found) if found else "没有 A 记录"))
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PY
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done
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echo
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echo "===== 3. 挨个试候选 IP，看哪个返回正常的 API JSON ====="
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for ip in 104.16.132.229 104.16.133.229 104.17.0.1 104.18.0.1 172.64.0.1 162.159.0.1; do
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OUT=$(timeout 12 curl -4 -s -w '\n%{http_code}' \
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--resolve "api.cloudflare.com:443:$ip" \
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https://api.cloudflare.com/client/v4/user 2>/dev/null)
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CODE=$(echo "$OUT" | tail -1)
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FIRST=$(echo "$OUT" | head -c 90 | tr -d '\n')
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printf " %-16s HTTP %-4s %s\n" "$ip" "${CODE:-超时}" "$FIRST"
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done
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echo
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echo "===== 4. 去掉 hosts 钉的 IP，用系统解析试试 ====="
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# 临时备份并移除
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cp /etc/hosts /tmp/hosts.bak
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grep -v 'api.cloudflare.com' /etc/hosts > /tmp/hosts.new
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cat /tmp/hosts.new > /etc/hosts
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echo " 现在的解析: $(getent ahostsv4 api.cloudflare.com | head -1 | awk '{print $1}')"
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OUT=$(timeout 12 curl -4 -s -w '\n%{http_code}' https://api.cloudflare.com/client/v4/user 2>/dev/null)
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echo " HTTP $(echo "$OUT" | tail -1) $(echo "$OUT" | head -c 90)"
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echo
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echo " 把 hosts 恢复回去（钉 IP 还是需要的，不然全乱）"
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cp /tmp/hosts.bak /etc/hosts
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getent ahostsv4 api.cloudflare.com | head -1 | sed 's/^/ /'
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