The reason for the error is:
C. The sys module was not imported.
Explanation:
In Python, the sys module provides access to some variables used or maintained by the interpreter and to functions that interact strongly with the interpreter. The script attempts to use sys.argv to get the command-line arguments but encounters a NameError because the sys module has not been imported.
Corrected Script:
To fix the error, you need to import the sys module at the beginning of the script. Here is the corrected script:
#!/usr/bin/python
import socket
import sys # Import the sys module
ports = [21, 22, 23, 25, 80, 139, 443, 445, 3306, 3389]
if len(sys.argv) == 2:
target = socket.gethostbyname(sys.argv[1])
else:
print("Few arguments.")
print("Syntax: python {} <target>".format(sys.argv[0]))
sys.exit()
try:
for port in ports:
s = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
s.settimeout(2)
result = s.connect_ex((target, port))
if result == 0:
print("Port {} is opened".format(port))
s.close()
except KeyboardInterrupt:
print("Exiting...")
sys.exit()
The error message "NameError: name 'sys' is not defined" suggests that the script is trying to use the sys module, but it hasn't been properly imported or defined. Therefore, option C - "The sys module was not imported" - is the correct answer.
The script uses the sys module to get the command line arguments. The error message indicates that the interpreter does not recognize the sys name, which suggests that the module was not imported.
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