Question

出于安全原因，我们的Linux prod环境中没有netcat。我试图将短文写入/读入端口进行记录。写入记录器节点上读取的工作节点上的端口。 netcat会做这个工作有没有办法在Linux上使用Python做同样的事情？

Answer 1

我为你制作了一个脚本，保存它，chmod并使其可执行。并运行它。这应该适合你。如果你有疑问，请跟我说。

#!/usr/bin/python

import socket



def writer(sock):
    file=open("log.txt","w")      #you can specify a path for the file here, or a different file name
    while(1):
        try:
            output=sock.recv(500)
            file.write(output)
        except:
            file.close()

try:
    x=socket.socket()
    x.bind(("127.0.0.1",1339))    # Enter IP address and port according to your needs ( replace 127.0.0.1 and 1339 )
    x.listen(2)                   # This will accept upto two connections, change the number if you like
    sock,b=x.accept()
    writer(sock)
except:
    print("bye")
    exit()

Answer 2

感谢您的回复。我最终编写了自己的脚本。

我在logger节点上启动docs。
我在相同或不同的工作节点上启动2 netcat_reader.py个shell：

python netcat_writer.py writer1& 

python netcat_writer.py writer2&

结果是来自日志记录服务器上累积的2个报告脚本（netcat_writer.py）的消息的组合日志：

Receiving...
timed out 1
timed out 2
timed out 1
timed out 2
timed out 1
timed out 2
timed out 1
Got connection from ('10.20.102.39', 17992)
Got connection from ('10.20.102.39', 17994)
client:one --0--
client:two --0--
client:one --1--
client:one --2--
client:one --3--
client:one --4--
client:one --5--
client:two --1--
client:one --6--
client:two --2--
client:one --7--
client:two --3--
client:one --8--
client:two --4--
client:one --9--
client:two --5--
client:two --6--
client:two --7--
client:two --8--
client:two --9--

netcat_reader.py（在loggerhost123中运行）：

import socket   
import sys
e=sys.exit
s = socket.socket(socket.AF_INET, socket.SOCK_STREAM) 
s.setblocking(False)
s.settimeout(2)
#
host = socket.gethostname()
port = 12346                 
s.bind((host, port))       
s.listen(5)               
c1=c2=t1=t2=None
print "Receiving..."
while True:
        try: 
            if not c1:
                c1, addr1 = s.accept()
                print 'Got connection from', addr1  
            if t1:
                print t1.decode('utf-8')
            if c1:
                t1 = c1.recv(1024)
        except socket.error, er:
            err = er.args[0]
            print err   ,1

        try: 
            if not c2:
                c2, addr2 = s.accept()
                print 'Got connection from', addr2
            if t2:
                print t2.decode('utf-8')
            if c2:
                t2 = c2.recv(1024)
        except socket.error, er:
            err = er.args[0]
            print err,2             
c1.close()
c2.close()      
s.shutdown(socket.SHUT_WR)  
s.close()
print "Done Receiving"
e(0)

netcat_writer.py（在报告节点上运行）

import socket 
import sys, time
e=sys.exit
assert len(sys.argv)==2, 'Client name is not set'
client_name= sys.argv[1]
class NetcatWriter:
    def __init__(self, port,client_name):
        print '__init__'
        self.s = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
        self.host = 'loggerhost123' 
        self.port = port 
        self.client_name=client_name
        self.s.connect((self.host, self.port))  
    def __enter__(self):
        print '__enter__'
        return self     
    def write(self,i):      
        print 'Sending..',
        l = 'client:%s --%d--'  % (self.client_name,i)
        while (l):
          print '.',
          self.s.send(l)
          l=None
        #f.close()
        print "Done Sending"
        #
    def __exit__(self, exc_type, exc_value, traceback): 
        self.s.shutdown(socket.SHUT_WR)
        self.s.close

netcat= NetcatWriter(12346,client_name)
if 1:
    for i in range(10):
        netcat.write(i) 
        time.sleep(0.1)
e(0)

Answer 3

我在工作中使用它来处理需要从网络节点获取消息的某些情况。希望它会对你有所帮助。你需要根据自己的需要进行调整。我不会为你做所有的工作，但我会给你正确的方向。

!#/usr/bin/env python
import socket

def netcat_alternative(ip, port):
    req = socket.create_connection((ip, port)).recv(1024)
    print(req) #alternatively you can log this value
    req.close()

# main goes here
def main():
    """
    main logic flow
    """
    string_ip = '127.0.0.1'
    int_port = 80
    netcat_alternative(string_ip, int_port)


if __name__ == "__main__":
    main()

在使用Python的Linux上是否有netcat替代方案？

3 个答案: