#!/usr/bin/python3.7# !coding:utf-8__author__ = ’hsz’__date__ = ’Thu Feb 27 22:41:15 EST 2020’import timeimport structimport socketimport selectimport sysdef chesksum(data): ''' 校驗 ''' n = len(data) m = n % 2 sum = 0 for i in range(0, n - m, 2): sum += (data[i]) + ((data[i + 1]) << 8) # 傳入data以每兩個字節（十六進制）通過ord轉十進制，第一字節在低位，第二個字節在高位 if m: sum += (data[-1]) # 將高于16位與低16位相加 sum = (sum >> 16) + (sum & 0xffff) sum += (sum >> 16) # 如果還有高于16位，將繼續與低16位相加 answer = ~sum & 0xffff # 主機字節序轉網絡字節序列（參考小端序轉大端序） answer = answer >> 8 | (answer << 8 & 0xff00) return answer ’’’ 連接套接字,并將數據發送到套接字 ’’’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 ’’’ request ping ’’’def request_ping(data_type, data_code, data_checksum, data_ID, data_Sequence, payload_body): # 把字節打包成二進制數據 imcp_packet = struct.pack(’>BBHHH32s’, data_type, data_code, data_checksum, data_ID, data_Sequence, payload_body) icmp_chesksum = chesksum(imcp_packet) # 獲取校驗和 imcp_packet = struct.pack(’>BBHHH32s’, data_type, data_code, icmp_chesksum, data_ID, data_Sequence, payload_body) return imcp_packet ’’’ reply ping ’’’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 ’’’ 實現 ping 主機/ip ’’’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) # 將主機名轉ipv4地址格式，返回以ipv4地址格式的字符串，如果主機名稱是ipv4地址，則它將保持不變 print('正在 Ping {0} [{1}] 具有 32 字節的數據:'.format(host, dst_addr)) for i in range(0, 4): 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('來自 {0} 的回復: 字節=32 時間={1}ms'.format(addr, int(times * 1000))) time.sleep(0.7) else: print('請求超時。')if __name__ == '__main__': # if len(sys.argv) < 2: # sys.exit(’Usage: ping.py <host>’) ping(’www.baidu.com’) # sys.argv[1]二 .python實現ping返回延遲簡單版本

from ping3 import pingdef ping_host(ip): ''' 獲取節點的延遲的作用 :param node: :return: ''' ip_address = ip response = ping(ip_address) print(response) if response is not None: delay = int(response * 1000) print(delay, '延遲') # 下面兩行新增的ping_host(’www.baidu.com’)

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