from?socket?import?*
import?os
import?sys
import?struct
import?time
import?select
import?binascii??

ICMP_ECHO_REQUEST?=?8

def?checksum（string）:?
	csum?=?0
	countTo?=?（len（string）?//?2）?*?2??
	count?=?0

	while?count?		thisVal?=?ord（string[count+1]）?*?256?+?ord（string[count]）?
		csum?=?csum?+?thisVal?
		csum?=?csum?&?0xffffffff??
		count?=?count?+?2
	
	if?countTo?		csum?=?csum?+?ord（string[len（string）?-?1]）
		csum?=?csum?&?0xffffffff?
	
	csum?=?（csum?>>?16）?+?（csum?&?0xffff）
	csum?=?csum?+?（csum?>>?16）
	answer?=?~csum?
	answer?=?answer?&?0xffff?
	answer?=?answer?>>?8?|?（answer?<	return?answer?
	
def?receiveOnePing（mySocket?ID?timeout?destAddr）:
	timeLeft?=?timeout
	
	while?1:?
		startedSelect?=?time.time（）
		whatReady?=?select.select（[mySocket]?[]?[]?timeLeft）
		howLongInSelect?=?（time.time（）?-?startedSelect）
		if?whatReady[0]?==?[]:?#?Timeout
			return?“Request?timed?out.“
	
		timeReceived?=?time.time（）?
		recPacket?addr?=?mySocket.recvfrom（1024）
		
		#?Fetch?the?ICMPHeader?from?the?IP
		icmpHeader?=?recPacket[20:28]

		rawTTL?=?struct.unpack（“s“?bytes（[recPacket[8]]））[0]??
		
		#?binascii?--?Convert?between?binary?and?ASCII??
		TTL?=?int（binascii.hexlify（rawTTL）?16）?
		
		icmpType?code?checksum?packetID?sequence?=?struct.unpack（“bbHHh“?icmpHeader）
		
		if?packetID?==?ID:
			byte?=?struct.calcsize（“d“）?
			timeSent?=?struct.unpack（“d“?recPacket[28:28?+?byte]）[0]
			return?“Reply?from?%s:?bytes=%d?time=%f5ms?TTL=%d“?%?（destAddr?len（recPacket）?（timeReceived?-?timeSent）*1000?TTL）
		
		timeLeft?=?timeLeft?-?howLongInSelect
		if?timeLeft?<=?0:
			return?“Request?timed?out.“

	
def?sendOnePing（mySocket?destAddr?ID）:
	#?Header?is?type?（8）?code?（8）?checksum?（16）?id?（16）?sequence?（16）
	
	myChecksum?=?0
	#?Make?a?dummy?header?with?a?0?checksum
	#?struct?--?Interpret?strings?as?packed?binary?data
	header?=?struct.pack（“bbHHh“?ICMP_ECHO_REQUEST?0?myChecksum?ID?1）
	data?=?struct.pack（“d“?time.time（））
	#?Calculate?the?checksum?on?the?data?and?the?dummy?header.

	myChecksum?=?checksum（str（header?+?data））?
	
	#?Get?the?right?checksum?and?put?in?the?header
	if?sys.platform?==?‘darwin‘:
		#?Convert?16-bit?integers?from?host?to?network?byte?order
		myChecksum?=?htons（myChecksum）?&?0xffff		
	else:
		myChecksum?=?htons（myChecksum）
		
	header?=?struct.pack（“bbHHh“?ICMP_ECHO_REQUEST?0?myChecksum?ID?1）
	packet?=?header?+?data
	
	mySocket.sendto（packet?（destAddr?1））?#?AF_INET?address?must?be?tuple?not?str
	#?Both?LISTS?and?TUPLES?consist?of?a?number?of?objects
	#?which?can?be?referenced?by?their?position?number?within?the?object.
	
def?doOnePing（destAddr?timeout）:?
	icmp?=?getprotobyname（“icmp“）

	#?SOCK_RAW?is?a?powerful?socket?type.?For?more?details:???http://sock-raw.org/papers/sock_raw
	mySocket?=?socket（AF_INET?SOCK_RAW?icmp）
	
	myID?=?os.getpid（）?&?0xFFFF??#?Return?the?current?process?i

?屬性????????????大小?????日期????時間???名稱
-----------?---------??----------?-----??----
?????目錄???????????0??2018-11-29?22:31??resources\599710134312805_Pythonsol-260138\
?????目錄???????????0??2018-11-29?22:31??resources\599710134312805_Pythonsol-260138\__MACOSX\
?????文件?????????222??2016-05-26?16:27??resources\599710134312805_Pythonsol-260138\__MACOSX\._Solutions
?????目錄???????????0??2018-11-29?22:31??resources\599710134312805_Pythonsol-260138\__MACOSX\Solutions\
?????文件?????????120??2016-05-26?16:27??resources\599710134312805_Pythonsol-260138\__MACOSX\Solutions\._.DS_Store
?????文件?????????222??2015-03-09?12:07??resources\599710134312805_Pythonsol-260138\__MACOSX\Solutions\._IcmpPing
?????文件?????????222??2015-03-09?12:07??resources\599710134312805_Pythonsol-260138\__MACOSX\Solutions\._ProxyServer
?????文件?????????222??2015-03-09?12:07??resources\599710134312805_Pythonsol-260138\__MACOSX\Solutions\._SMTPClient
?????文件?????????222??2015-03-09?12:07??resources\599710134312805_Pythonsol-260138\__MACOSX\Solutions\._StreamingVideo
?????文件?????????222??2015-03-16?09:56??resources\599710134312805_Pythonsol-260138\__MACOSX\Solutions\._Traceroute
?????文件?????????222??2015-03-09?12:07??resources\599710134312805_Pythonsol-260138\__MACOSX\Solutions\._UDPPinger
?????文件?????????222??2015-03-09?12:07??resources\599710134312805_Pythonsol-260138\__MACOSX\Solutions\._Webserver
?????目錄???????????0??2018-11-29?22:31??resources\599710134312805_Pythonsol-260138\__MACOSX\Solutions\IcmpPing\
?????文件?????????222??2015-03-08?16:31??resources\599710134312805_Pythonsol-260138\__MACOSX\Solutions\IcmpPing\._IcmpPing.py
?????目錄???????????0??2018-11-29?22:31??resources\599710134312805_Pythonsol-260138\__MACOSX\Solutions\ProxyServer\
?????文件?????????222??2015-03-07?19:24??resources\599710134312805_Pythonsol-260138\__MACOSX\Solutions\ProxyServer\._ProxyServer.py
?????目錄???????????0??2018-11-29?22:31??resources\599710134312805_Pythonsol-260138\__MACOSX\Solutions\SMTPClient\
?????文件?????????222??2015-03-07?20:24??resources\599710134312805_Pythonsol-260138\__MACOSX\Solutions\SMTPClient\._SMTPClient.py
?????目錄???????????0??2018-11-29?22:31??resources\599710134312805_Pythonsol-260138\__MACOSX\Solutions\StreamingVideo\
?????文件?????????222??2015-03-09?11:39??resources\599710134312805_Pythonsol-260138\__MACOSX\Solutions\StreamingVideo\._Client.py
?????文件?????????222??2015-03-08?09:39??resources\599710134312805_Pythonsol-260138\__MACOSX\Solutions\StreamingVideo\._RtpPacket.py
?????目錄???????????0??2018-11-29?22:31??resources\599710134312805_Pythonsol-260138\__MACOSX\Solutions\Traceroute\
?????文件?????????222??2015-03-16?09:56??resources\599710134312805_Pythonsol-260138\__MACOSX\Solutions\Traceroute\._Traceroute.py
?????目錄???????????0??2018-11-29?22:31??resources\599710134312805_Pythonsol-260138\__MACOSX\Solutions\UDPPinger\
?????文件?????????222??2015-03-08?17:08??resources\599710134312805_Pythonsol-260138\__MACOSX\Solutions\UDPPinger\._UDP_Pinger_Client.py
?????目錄???????????0??2018-11-29?22:31??resources\599710134312805_Pythonsol-260138\__MACOSX\Solutions\Webserver\
?????文件?????????222??2015-03-06?17:00??resources\599710134312805_Pythonsol-260138\__MACOSX\Solutions\Webserver\._Websever.py
?????目錄???????????0??2018-11-29?22:31??resources\599710134312805_Pythonsol-260138\Solutions\
?????文件????????6148??2016-05-26?16:27??resources\599710134312805_Pythonsol-260138\Solutions\.DS_Store
?????目錄???????????0??2018-11-29?22:31??resources\599710134312805_Pythonsol-260138\Solutions\IcmpPing\
?????文件????????3625??2015-03-08?16:31??resources\599710134312805_Pythonsol-260138\Solutions\IcmpPing\IcmpPing.py
............此處省略47個文件信息