在 Python 中获取本地 DNS 设置

Question

是否有任何优雅的跨平台 (Python) 方法来获取本地 DNS 设置？

它可能与复杂的模块组合一起工作，例如 platform 和 subprocess，但也许已经有一个好的模块，例如 netifaces 可以在低级别并节省一些 "reinventing the wheel" 精力。

不太理想，人们可能会查询类似 dig 的内容，但我发现它 "noisy"，因为它会运行一个额外的请求，而不是仅仅检索本地已经存在的东西.

有什么想法吗？

Answer 1

使用子进程，您可以在 MacBook 或 Linux 系统中执行类似的操作

import subprocess

process = subprocess.Popen(['cat', '/etc/resolv.conf'],
                     stdout=subprocess.PIPE,
                     stderr=subprocess.PIPE)
stdout, stderr = process.communicate()
print(stdout, stderr)

或者做这样的事情

import subprocess
with open('dns.txt', 'w') as f:
    process = subprocess.Popen(['cat', '/etc/resolv.conf'], stdout=f)

第一个输出将转到标准输出，第二个输出到文件

Answer 2

也许这个可以解决您的问题

import subprocess

def get_local_dns(cmd_):
    with open('dns1.txt', 'w+') as f:
        with open('dns_log1.txt', 'w+') as flog:
            try:
                process = subprocess.Popen(cmd_, stdout=f, stderr=flog)
            except FileNotFoundError as e:
                flog.write(f"Error while executing this command {str(e)}")


linux_cmd = ['cat', '/etc/resolv.conf']
windows_cmd = ['windows_command', 'parameters']
commands = [linux_cmd, windows_cmd]


if __name__ == "__main__":
    for cmd in commands:
        get_local_dns(cmd)

Answer 3

谢谢@MasterOfTheHouse。我最终编写了自己的函数。它不是那么优雅，但它现在可以完成工作。有很大的改进空间，但是...

import os
import subprocess

def get_dns_settings()->dict:
    # Initialize the output variables
    dns_ns, dns_search = [], ''

    # For Unix based OSs
    if os.path.isfile('/etc/resolv.conf'):
        for line in open('/etc/resolv.conf','r'):
            if line.strip().startswith('nameserver'):
                nameserver = line.split()[1].strip()
                dns_ns.append(nameserver)
            elif line.strip().startswith('search'):
                search = line.split()[1].strip()
                dns_search = search

    # If it is not a Unix based OS, try "the Windows way"
    elif os.name == 'nt':
        cmd = 'ipconfig /all'
        raw_ipconfig = subprocess.check_output(cmd)
        # Convert the bytes into a string
        ipconfig_str = raw_ipconfig.decode('cp850')
        # Convert the string into a list of lines
        ipconfig_lines = ipconfig_str.split('\n')

        for n in range(len(ipconfig_lines)):
            line = ipconfig_lines[n]
            # Parse nameserver in current line and next ones
            if line.strip().startswith('DNS-Server'):
                nameserver = ':'.join(line.split(':')[1:]).strip()
                dns_ns.append(nameserver)
                next_line = ipconfig_lines[n+1]
                # If there's too much blank at the beginning, assume we have
                # another nameserver on the next line
                if len(next_line) - len(next_line.strip()) > 10:
                    dns_ns.append(next_line.strip())
                    next_next_line = ipconfig_lines[n+2]
                    if len(next_next_line) - len(next_next_line.strip()) > 10:
                        dns_ns.append(next_next_line.strip())

            elif line.strip().startswith('DNS-Suffix'):
                dns_search = line.split(':')[1].strip()

    return {'nameservers': dns_ns, 'search': dns_search}

print(get_dns_settings())

顺便问一下...您是如何用同一个帐户写出两个答案的？

在 Python 中获取本地 DNS 设置

Get local DNS settings in Python

python

dns

cross-platform

system

localhost