jumpserver/apps/settings/utils/ping.py

163 lines
4.8 KiB
Python

# -*- coding: utf-8 -*-
#
import os
import select
import socket
import struct
import time
from common.utils import lookup_domain
# From /usr/include/linux/icmp.h; your milage may vary.
ICMP_ECHO_REQUEST = 8 # Seems to be the same on Solaris.
def checksum(source_string):
"""
I'm not too confident that this is right but testing seems
to suggest that it gives the same answers as in_cksum in ping.c
"""
sum = 0
count_to = int((len(source_string) / 2) * 2)
for count in range(0, count_to, 2):
this = source_string[count + 1] * 256 + source_string[count]
sum = sum + this
sum = sum & 0xffffffff # Necessary?
if count_to < len(source_string):
sum = sum + ord(source_string[len(source_string) - 1])
sum = sum & 0xffffffff # Necessary?
sum = (sum >> 16) + (sum & 0xffff)
sum = sum + (sum >> 16)
answer = ~sum
answer = answer & 0xffff
# Swap bytes. Bugger me if I know why.
answer = answer >> 8 | (answer << 8 & 0xff00)
return answer
def receive_one_ping(my_socket, id, timeout):
"""
Receive the ping from the socket.
"""
time_left = timeout
while True:
started_select = time.time()
what_ready = select.select([my_socket], [], [], time_left)
how_long_in_select = time.time() - started_select
if not what_ready[0]: # Timeout
return
time_received = time.time()
received_packet, addr = my_socket.recvfrom(1024)
icmpHeader = received_packet[20:28]
type, code, checksum, packet_id, sequence = struct.unpack("bbHHh", icmpHeader)
if packet_id == id:
bytes = struct.calcsize("d")
time_sent = struct.unpack("d", received_packet[28: 28 + bytes])[0]
return time_received - time_sent
time_left = time_left - how_long_in_select
if time_left <= 0:
return
def send_one_ping(my_socket, dest_addr, id, psize):
"""
Send one ping to the given >dest_addr<.
"""
dest_addr = socket.gethostbyname(dest_addr)
# Remove header size from packet size
# psize = psize - 8
# laixintao edit:
# Do not need to remove header here. From BSD ping man:
# The default is 56, which translates into 64 ICMP data
# bytes when combined with the 8 bytes of ICMP header data.
# Header is type (8), code (8), checksum (16), id (16), sequence (16)
my_checksum = 0
# Make a dummy heder with a 0 checksum.
header = struct.pack("bbHHh", ICMP_ECHO_REQUEST, 0, my_checksum, id, 1)
bytes = struct.calcsize("d")
data = (psize - bytes) * b"Q"
data = struct.pack("d", time.time()) + data
# Calculate the checksum on the data and the dummy header.
my_checksum = checksum(header + data)
# Now that we have the right checksum, we put that in. It's just easier
# to make up a new header than to stuff it into the dummy.
header = struct.pack(
"bbHHh", ICMP_ECHO_REQUEST, 0, socket.htons(my_checksum), id, 1
)
packet = header + data
my_socket.sendto(packet, (dest_addr, 1)) # Don't know about the 1
def ping(dest_addr, timeout, psize, flag=0):
"""
Returns either the delay (in seconds) or none on timeout.
"""
icmp = socket.getprotobyname("icmp")
try:
if os.getuid() != 0:
my_socket = socket.socket(socket.AF_INET, socket.SOCK_DGRAM, icmp)
else:
my_socket = socket.socket(socket.AF_INET, socket.SOCK_RAW, icmp)
except socket.error as e:
if e.errno == 1:
# Operation not permitted
msg = str(e)
raise socket.error(msg)
raise # raise the original error
process_pre = os.getpid() & 0xFF00
flag = flag & 0x00FF
my_id = process_pre | flag
send_one_ping(my_socket, dest_addr, my_id, psize)
delay = receive_one_ping(my_socket, my_id, timeout)
my_socket.close()
return delay
def verbose_ping(dest_addr, timeout=2, count=5, psize=64, display=None):
"""
Send `count' ping with `psize' size to `dest_addr' with
the given `timeout' and display the result.
"""
ip = lookup_domain(dest_addr)
if not ip:
return
if display is None:
display = print
display("PING %s (%s): 56 data bytes" % (dest_addr, ip))
for i in range(count):
try:
delay = ping(dest_addr, timeout, psize)
except socket.gaierror as e:
display("failed. (socket error: '%s')" % str(e))
break
if delay is None:
display("Request timeout for icmp_seq %i" % i)
else:
delay = delay * 1000
display("64 bytes from %s: icmp_seq=0 ttl=115 time=%.3f ms" % (ip, delay))
time.sleep(1)
print()
if __name__ == "__main__":
verbose_ping("google.com")
verbose_ping("192.168.4.1")
verbose_ping("www.baidu.com")
verbose_ping("sssssss")