計劃目標
A服务器(香港)能请求B服务器(国内)Ping某IP并将结果发送回给A服务器
計劃做法
B服务器建立API连结给A服务器发请求经API到B服务器并得出Ping结果后经API发送回给A服务器收集结果数据
遇到難點
不肯定API能否做到和如何做
希望得到
达成目标的方法
可以使用Python的Flask框架建一个API，很容易就可以实现
http://120.78.189.127/test?ip=baidu.com
from flask import Flask, request
import socket
import time
import struct
import select
def chesksum(data):
"""
校验
"""
n = len(data)
m = n % 2
sum = 0
for i in range(0, n - m, 2):
sum += (data[i]) + ((data[i + 1]) << 8) # 传入data以每两个字节（十六进制）通过ord转十进制，第一字节在低位，第二个字节在高位
if m:
sum += (data[-1])
# 将高于16位与低16位相加
sum = (sum >> 16) + (sum & 0xffff)
sum += (sum >> 16) # 如果还有高于16位，将继续与低16位相加
answer = ~sum & 0xffff
# 主机字节序转网络字节序列（参考小端序转大端序）
answer = answer >> 8 | (answer << 8 & 0xff00)
return answer
def raw_socket(dst_addr, imcp_packet):
rawsocket = socket.socket(socket.AF_INET, socket.SOCK_RAW, socket.getprotobyname("icmp"))
send_request_ping_time = time.time()
# send data to the socket
rawsocket.sendto(imcp_packet, (dst_addr, 80))
return send_request_ping_time, rawsocket, dst_addr
def request_ping(data_type, data_code, data_checksum, data_ID, data_Sequence, payload_body):
# 把字节打包成二进制数据
imcp_packet = struct.pack('>BBHHH32s', data_type, data_code, data_checksum, data_ID, data_Sequence, payload_body)
icmp_chesksum = chesksum(imcp_packet) # 获取校验和
imcp_packet = struct.pack('>BBHHH32s', data_type, data_code, icmp_chesksum, data_ID, data_Sequence, payload_body)
return imcp_packet
def reply_ping(send_request_ping_time, rawsocket, data_Sequence, timeout=2):
while True:
started_select = time.time()
what_ready = select.select([rawsocket], [], [], timeout)
wait_for_time = (time.time() - started_select)
if what_ready[0] == []: # Timeout
return -1
time_received = time.time()
received_packet, addr = rawsocket.recvfrom(1024)
icmpHeader = received_packet[20:28]
type, code, checksum, packet_id, sequence = struct.unpack(
">BBHHH", icmpHeader
)
if type == 0 and sequence == data_Sequence:
return time_received - send_request_ping_time
timeout = timeout - wait_for_time
if timeout <= 0:
return -1
def ping(host):
data_type = 8 # ICMP Echo Request
data_code = 0 # must be zero
data_checksum = 0 # "...with value 0 substituted for this field..."
data_ID = 0 # Identifier
data_Sequence = 1 # Sequence number
payload_body = b'abcdefghijklmnopqrstuvwabcdefghi' # data
dst_addr = socket.gethostbyname(host) # 将主机名转ipv4地址格式，返回以ipv4地址格式的字符串，如果主机名称是ipv4地址，则它将保持不变
result = ""
print("正在 Ping {0} [{1}] 具有 32 字节的数据:".format(host, dst_addr))
result += "正在 Ping {0} [{1}] 具有 32 字节的数据:".format(host, dst_addr)
for i in range(0, 5):
icmp_packet = request_ping(data_type, data_code, data_checksum, data_ID, data_Sequence + i, payload_body)
send_request_ping_time, rawsocket, addr = raw_socket(dst_addr, icmp_packet)
times = reply_ping(send_request_ping_time, rawsocket, data_Sequence + i)
if times > 0:
print("来自 {0} 的回复: 字节=32 时间={1}ms".format(addr, int(times * 1000)))
result += "来自 {0} 的回复: 字节=32 时间={1}ms\n<br>".format(addr, int(times * 1000))
time.sleep(0.7)
else:
print("请求超时。")
result += "请求超时...\n<br>"
return result
app = Flask(__name__)
# 只接受get方法访问
@app.route("/test", methods=["GET"])
def check():
# 获取传入的参数
content = request.args.get("ip") # 获取键为‘name’的请求参数
print(content)
return ping(content)
if __name__ == "__main__":
app.run(host='0.0.0.0', port=80, debug=True)
很多方式都可以建立这种所谓的连接，比如用socket、ssh、http方式。看你用的语言和你想用什么技术。
香港、内地这个其实不是问题，只要你的境外的服务器合法没有被block掉。