shutdown(0)和shutdown(1)

正常的四次挥手:

tcpdump: verbose output suppressed, use -v or -vv for full protocol decode
listening on eth1, link-type EN10MB (Ethernet), capture size 65535 bytes
16:40:28.015509 IP 192.168.137.1.50566 > node1.webcache: Flags [S], seq 2511573816, win 8192, options [mss 1460,nop,wscale 2,nop,nop,sackOK], length 0
16:40:28.015554 IP node1.webcache > 192.168.137.1.50566: Flags [S.], seq 1665892250, ack 2511573817, win 1536, options [mss 256,nop,nop,sackOK,nop,wscale 6], length 0
16:40:28.016825 IP 192.168.137.1.50566 > node1.webcache: Flags [.], ack 1665892251, win 16482, length 0




16:40:38.003254 IP 192.168.137.1.50566 > node1.webcache: Flags [F.], seq 2511573817, ack 1665892251, win 16482, length 0
16:40:38.003896 IP node1.webcache > 192.168.137.1.50566: Flags [F.], seq 1665892251, ack 2511573818, win 24, length 0
16:40:38.004336 IP 192.168.137.1.50566 > node1.webcache: Flags [.], ack 1665892252, win 16482, length 0


print(socket.SHUT_RDWR)  2
print(socket.SHUT_RD)    0
print(socket.SHUT_WR)    1


关闭read:

import socket
import struct
import time
s = socket.socket(socket.AF_INET,socket.SOCK_STREAM)
s.setsockopt(socket.SOL_SOCKET, socket.SO_REUSEADDR, 1)
s.connect(("192.168.137.2",8080))
s.shutdown(0)
time.sleep(10)




node1:/root/test#tcpdump -S -i eth1 '((tcp) and  (port 8080) and (host 192.168.137.1))'
tcpdump: verbose output suppressed, use -v or -vv for full protocol decode
listening on eth1, link-type EN10MB (Ethernet), capture size 65535 bytes

17:06:50.569831 IP 192.168.137.1.51743 > node1.webcache: Flags [S], seq 2708657781, win 8192, options [mss 1460,nop,wscale 2,nop,nop,sackOK], length 0
17:06:50.569934 IP node1.webcache > 192.168.137.1.51743: Flags [S.], seq 4031762968, ack 2708657782, win 1536, options [mss 256,nop,nop,sackOK,nop,wscale 6], length 0
17:06:50.570212 IP 192.168.137.1.51743 > node1.webcache: Flags [.], ack 4031762969, win 16482, length 0

shutdown(0)不发送FIN




import socket
import struct
import time
s = socket.socket(socket.AF_INET,socket.SOCK_STREAM)
s.setsockopt(socket.SOL_SOCKET, socket.SO_REUSEADDR, 1)
s.connect(("192.168.137.2",8080))
time.sleep(10)

s.shutdown(1)
print '111111111111111'
time.sleep(100)


shutdown(1)


17:08:08.185555 IP 192.168.137.1.51799 > node1.webcache: Flags [F.], seq 1521092233, ack 2941928650, win 16482, length 0
17:08:08.185692 IP node1.webcache > 192.168.137.1.51799: Flags [F.], seq 2941928650, ack 1521092234, win 24, length 0
17:08:08.186009 IP 192.168.137.1.51799 > node1.webcache: Flags [.], ack 2941928651, win 16482, length 0