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POAlgorithm to extract network info from ifconfig (ubuntu)
 

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  1. POAlgorithm to extract network info from ifconfig (ubuntu)
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    <p>Im trying to parse info from ifconfig (ubuntu). Normally, I would split a chunk of data like this down into words, and then search for substrings to get what I want. For example, given <code>line = "inet addr:192.168.98.157 Bcast:192.168.98.255 Mask:255.255.255.0"</code>, and looking for the broadcast address, I would do:</p> <pre><code>for word in line.split(): if word.startswith('Bcast'): print word.split(':')[-1] &gt;&gt;&gt;192.168.98.255 </code></pre> <p>However, I feel its about time to start learning how to use regular expressions for tasks like this. Here is my code so far. I've hacked through a couple of patterns (inet addr, Bcast, Mask). Questions after code...</p> <pre><code># git clone git://gist.github.com/1586034.git gist-1586034 import re import json ifconfig = """ eth0 Link encap:Ethernet HWaddr 08:00:27:3a:ab:47 inet addr:192.168.98.157 Bcast:192.168.98.255 Mask:255.255.255.0 inet6 addr: fe80::a00:27ff:fe3a:ab47/64 Scope:Link UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1 RX packets:189059 errors:0 dropped:0 overruns:0 frame:0 TX packets:104380 errors:0 dropped:0 overruns:0 carrier:0 collisions:0 txqueuelen:1000 RX bytes:74213981 (74.2 MB) TX bytes:15350131 (15.3 MB)\n\n lo Link encap:Local Loopback inet addr:127.0.0.1 Mask:255.0.0.0 inet6 addr: ::1/128 Scope:Host UP LOOPBACK RUNNING MTU:16436 Metric:1 RX packets:389611 errors:0 dropped:0 overruns:0 frame:0 TX packets:389611 errors:0 dropped:0 overruns:0 carrier:0 collisions:0 txqueuelen:0 RX bytes:81962238 (81.9 MB) TX bytes:81962238 (81.9 MB) """ for paragraph in ifconfig.split('\n\n'): info = { 'eth_port': '', 'ip_address': '', 'broadcast_address': '', 'mac_address': '', 'net_mask': '', 'up': False, 'running': False, 'broadcast': False, 'multicast': False, } if 'BROADCAST' in paragraph: info['broadcast'] = True if 'MULTICAST' in paragraph: info['multicast'] = True if 'UP' in paragraph: info['up'] = True if 'RUNNING' in paragraph: info['running'] = True ip = re.search( r'inet addr:[^\s]+', paragraph ) if ip: info['ip_address'] = ip.group().split(':')[-1] bcast = re.search( r'Bcast:[^\s]+', paragraph ) if bcast: info['broadcast_address'] = bcast.group().split(':')[-1] mask = re.search( r'Mask:[^\s]+', paragraph ) if mask: info['net_mask'] = mask.group().split(':')[-1] print paragraph print json.dumps(info, indent=4) </code></pre> <p>Here're my questions:</p> <ol> <li><p>Am I taking the best approach for the patterns I have already implemented? Can I grab the addresses without splitting on ':' and then choosing the last of the array.?</p></li> <li><p>I'm stuck on HWaddr. What would be a pattern to match this mac address?</p></li> </ol> <p>EDIT:</p> <p>Ok, so here's how I ended up going about this. I started out trying to go about this without the regex... just manipulating stings and lists. But that proved to be a nightmare. For example, what separates <code>HWaddr</code> from its address is a <code>space</code>. Now take <code>inet addr</code> its separated from its address by <code>:</code>. Its a total bitch to scrape with differing separators like this. Not only a bitch to code but also a bitch to read. </p> <p>So, I did this with regex. I think this makes a strong case for when to use regular expressions.</p> <pre><code># git clone git://gist.github.com/1586034.git gist-1586034 # USAGE: pipe ifconfig into script. ie "ifconfig | python pyifconfig.py" # output is a list of json datastructures import sys import re import json ifconfig = sys.stdin.read() print 'STARTINPUT' print ifconfig print 'ENDINPUT' def extract(input): mo = re.search(r'^(?P&lt;interface&gt;eth\d+|eth\d+:\d+)\s+' + r'Link encap:(?P&lt;link_encap&gt;\S+)\s+' + r'(HWaddr\s+(?P&lt;hardware_address&gt;\S+))?' + r'(\s+inet addr:(?P&lt;ip_address&gt;\S+))?' + r'(\s+Bcast:(?P&lt;broadcast_address&gt;\S+)\s+)?' + r'(Mask:(?P&lt;net_mask&gt;\S+)\s+)?', input, re.MULTILINE ) if mo: info = mo.groupdict('') info['running'] = False info['up'] = False info['multicast'] = False info['broadcast'] = False if 'RUNNING' in input: info['running'] = True if 'UP' in input: info['up'] = True if 'BROADCAST' in input: info['broadcast'] = True if 'MULTICAST' in input: info['multicast'] = True return info return {} interfaces = [ extract(interface) for interface in ifconfig.split('\n\n') if interface.strip() ] print json.dumps(interfaces, indent=4) </code></pre>
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