Python read_until返回断线字符串
Python telnetlib read_until recv问题
"read_until“函数使用长命令返回断线字符串。
这些命令运行得很完美，但没有显示完整的文本。
我怎么才能解决这个问题？请帮帮忙。
#我的代码
tn = telnetlib.Telnet(ip, 23, 5)
prompt = ']# '
tn.write('echo "this is a long command for the test purpose... > test.txt"\n')
print tn.read_until(prompt, 1)#调试输出
Telnet(192.168.220.4,23)：发送'echo‘这是一个用于测试目的的长命令.> test.txt"\n’
Telnet(192.168.220.4,23)：recv 'echo‘这是一个l’
Telnet(192.168.220.4,23)：用于测试目的的recv 'ong命令.> te\r\x00
Telnet(192.168.220.4,23)：recv‘用于测试目的的长命令.> tes’
Telnet(192.168.220.4,23)：recv‘\x08\x08\x08\x08\x08\x08\x08\x08\x08\x08\x08\x08\x08\x08\x08\x08\x08\x08\x08\x08\x08\x08\x08\x08\x0 8t.txt’
Telnet(192.168.220.4,23)：recv‘\r\n这是一个用于测试的长命令.>‘
Telnet(192.168.220.4,23)：recv‘test.txt\r\n nroot@RHEL6 6-5 tmp#’
#实输出
test.txt“
这是一个很长的测试命令.> test.txt
根@RHEL6 6-5 tmp#
回答 2
Stack Overflow用户
发布于 2016-08-02 05:28:13
这个问题似乎是由于线的包装而发生的.我找到了一种解决方案，将窗口大小宽度设置为接近最大值允许接收长行，而不需要telnet服务器应用行包装。
(有关设置选项https://www.ietf.org/rfc/rfc1073.txt的详细信息，请参阅窗口大小选项RFC )
import telnetlib
import struct
from telnetlib import DO, DONT, IAC, WILL, WONT, NAWS, SB, SE
MAX_WINDOW_WIDTH = 65000 # Max Value: 65535
MAX_WINDOW_HEIGHT = 5000
def set_max_window_size(tsocket, command, option):
"""
Set Window size to resolve line width issue
Set Windows size command: IAC SB NAWS <16-bit value> <16-bit value> IAC SE
--> inform the Telnet server of the window width and height.
Refer to https://www.ietf.org/rfc/rfc1073.txt
:param tsocket: telnet socket object
:param command: telnet Command
:param option: telnet option
:return: None
"""
if option == NAWS:
width = struct.pack('H', MAX_WINDOW_WIDTH)
height = struct.pack('H', MAX_WINDOW_HEIGHT)
tsocket.send(IAC + WILL + NAWS)
tsocket.send(IAC + SB + NAWS + width + height + IAC + SE)
# -- below code taken from telnetlib source
elif command in (DO, DONT):
tsocket.send(IAC + WONT + option)
elif command in (WILL, WONT):
tsocket.send(IAC + DONT + option)
ip = 'x.x.x.x'
tn = telnetlib.Telnet(ip, 23, timeout=5)
tn.set_option_negotiation_callback(set_max_window_size)
tn.write('echo "this is a long command for the test purpose... > test.txt"\n')
prompt = ']# '
print tn.read_until(prompt, timeout=1)Stack Overflow用户
发布于 2019-05-07 08:59:40
为我工作。
def set_max_window_size(tsocket, command, option):
"""
Set Window size to resolve line width issue
Set Windows size command: IAC SB NAWS <16-bit value> <16-bit value> IAC SE
--> inform the Telnet server of the window width and height.
Refer to https://www.ietf.org/rfc/rfc1073.txt
:param tsocket: telnet socket object
:param command: telnet Command
:param option: telnet option
:return: None
"""
if option == NAWS:
naws_command = struct.pack('!BBBHHBB',
255, 250, 31, # IAC SB NAWS
50, 100, #width, height
255, 240) # IAC SE
tsocket.send(naws_command)
# -- below code taken from telnetlib source
elif command in (DO, DONT):
tsocket.send(IAC + WONT + option)
elif command in (WILL, WONT):
tsocket.send(IAC + DONT + option)
ip = 'x.x.x.x'
tn = telnetlib.Telnet(ip, 23, timeout=5)
socket = tn.get_socket()
tn.set_option_negotiation_callback(set_max_window_size)
tn.write('echo "this is a long command for the test purpose... > test.txt"\n')
prompt = ']# '
print tn.read_until(prompt, timeout=1)https://stackoverflow.com/questions/38288887
复制相似问题
腾讯云开发者
