Python子进程通过客户端/服务器更改目录 [英] Python subprocess change dir via client/server

问题描述

我正在尝试通过现有客户端上的套接字库远程更改 cwd，但每次发送实际命令cd .."时我都会遇到麻烦.

I am trying to remotely change the cwd via socket lib on existing client, but I am running into the trouble every time I send the actual command "cd ..".

服务器:

import socket, subprocess, os, sys

s = socket.socket()

host = socket.gethostname()
ip = socket.gethostbyname(host)
port = 8080

s.bind((ip,port))
s.listen(5)

c, a = s.accept()

fr = c.recv(10000)

cwd = fr

print("IP: "+str(a[0])+":"+str(a[1])+"\tCONNECTED")

while True:
    cmd = raw_input("\n"+cwd+"> ")
    if cmd != "":
        c.sendall(cmd)
        data = c.recv(1024)
        print("\n"+data)

    if cmd == "cd ..":
        c.sendall(cmd)
        cwd = c.recv(1024)

客户:

import socket, subprocess, os, sys



i = 1



cwd = os.getcwd()

while 1:
    s = socket.socket()
    host = socket.gethostname()
    ip = socket.gethostbyname(host)
    port = 8080

    try:
        s.settimeout(5)
        s.connect((ip,port))
        s.settimeout(None)
        s.sendall(cwd)

        i = 1

        while i == 1:
            cmd = s.recv(10000)
            if cmd != "over":
                sp = subprocess.Popen(cmd, shell=True, cwd=cwd, stdout=subprocess.PIPE, stderr=subprocess.PIPE, stdin=subprocess.PIPE)
                out = sp.stdout.read()+"_________________________________"
                msg = out + sp.stderr.read()
                s.sendall(msg)
            if cmd == "over":
                s.close()
                i = 0

            if cmd == "cd ..":
                j = 0
                k = 0
                for i in cwd:
                    if i == '/':
                        k = j
                    j = j + 1
                cd = cwd[0:k]
                subprocess.Popen('echo', shell=True, cwd=cd)
                s.sendall(cd)

                print(cd)


    except socket.error:
        continue

这是我得到的错误:

Traceback (most recent call last):
  File "PycharmProjects/server-client/test_hq.py", line 25, in <module>
    c.sendall(cmd)
  File "/usr/lib/python2.7/socket.py", line 228, in meth
    return getattr(self._sock,name)(*args)
socket.error: [Errno 104] Connection reset by peer

我无法弄清楚似乎是什么问题...

I can't figure it out what seems to be the problem...

推荐答案

这个应该更接近你想要的，接收和发送一次比重复发送和接收相同的命令简单很多:

This should be closer to what you want, it is a lot simpler to receive and send once instead of repeatedly sending and receiving the same commands:

Client.py:

import socket, subprocess, os, sys

cwd = os.getcwd()

def make_socket():
    s = socket.socket()
    host = socket.gethostname()
    ip = socket.gethostbyname(host)
    port = 8080
    s.settimeout(5)
    s.connect((ip, port))
    s.settimeout(None)
    s.sendall(cwd)
    return s

while True:
    s = make_socket()
    try:
        while True:
            cmd = s.recv(10000)
            if cmd == "cd ..":
                # os.chdir("..") # uncomment to actually change directory
                cd = cwd.rsplit(os.sep(), 1)[0]
                subprocess.Popen('echo', shell=True, cwd=cd)
                s.sendall(cd)
            elif cmd != "over":
                sp = subprocess.Popen(cmd, shell=True, cwd=cwd, stdout=subprocess.PIPE, stderr=subprocess.PIPE,
                                      stdin=subprocess.PIPE)
                out = sp.stdout.read() + "_________________________________"
                msg = out + sp.stderr.read()
                s.sendall(msg)
            else:
                print("closed")
                s.close()
                sys.exit(0)
    except socket.error as e:
        print(e)
        break

server.py:

import socket, subprocess, os, sys

s = socket.socket()

host = socket.gethostname()
ip = socket.gethostbyname(host)
port = 8080

s.bind((ip,port))
s.listen(5)

c, a = s.accept()

fr = c.recv(10000)

cwd = fr

print("IP: "+str(a[0])+":"+str(a[1])+"\tCONNECTED")

while True:
    cmd = raw_input("\n"+cwd+"> ")
    if cmd == "cd ..":
        print("sending 2")
        c.sendall(cmd)
        # os.chdir("..") # uncomment to change dir
        cwd = c.recv(10000)
    elif cmd != "":
        print("sending 1")
        c.sendall(cmd)
        data = c.recv(10000)
        print("\n"+data)

如果你想在服务器端处理客户端关闭套接字和 sys.exit(0) 你应该在服务器端捕获 socket.error 以避免管道损坏错误.

If you want to handle the client closing the socket and sys.exit(0) on the server side you should catch a socket.error on the server side to avoid a broken pipe error.

try:
    while True:
        print(os.getcwd(),44444)
        cmd = raw_input("\n"+cwd+"> ")
        if cmd != "" and cmd != "cd ..":
            print("sending 1")
            c.sendall(cmd)
            data = c.recv(10000)
            print("\n"+data)
        if cmd == "cd ..":
            print("sending 2")
            c.sendall(cmd)
            # os.chdir("..") # uncomment to change dir
            cwd = c.recv(10000)
except socket.error as e:
    print("Exception caught for {}".format(e.strerror))

如果你想根据 errno 做不同的事情，你可以在 except 中进行比较:

If you want to do different things based on the errno you can compare in the except:

if e.errno == errno.EPIPE: 即断管等.

所有 errno 都在 errno 文档

All the errno's are listed here in the errno docs

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