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85 lines
2.5 KiB
85 lines
2.5 KiB
8 months ago
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#!/usr/bin/env python
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import csv
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import sys
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import socket
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""" An adapter that takes CSV as input, performs a lookup to the operating
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system hostname resolution facilities, then returns the CSV results
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This is intended as an example of creating external lookups in general.
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Note that the script offers mapping both ways, from host to IP and from IP
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to host.
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Bidrectional mapping is always required when using an external lookup as an
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'automatic' lookup: one configured to be used without explicit reference in
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a search.
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In the other use mode, eg in a search string as "|lookup lookupname", it is
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sufficient to provide only the mappings that will be used.
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WARNING: DNS is not unambiguously reversible, so this script will produce
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unusual results when used for values that do not reverse-resolve to
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their original values in your environment.
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For example, if your events have host=foo, and you search for
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ip=1.2.3.4, the generated search expression may be
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host=foo.yourcompany.com, which will not match.
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"""
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# Given a host, find the ip
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def lookup(host):
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try:
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hostname, aliaslist, ipaddrlist = socket.gethostbyname_ex(host)
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return ipaddrlist
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except:
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return []
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# Given an ip, return the host
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def rlookup(ip):
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try:
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hostname, aliaslist, ipaddrlist = socket.gethostbyaddr(ip)
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return hostname
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except:
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return ''
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def main():
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if len(sys.argv) != 3:
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print("Usage: python external_lookup.py [host field] [ip field]")
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sys.exit(1)
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hostfield = sys.argv[1]
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ipfield = sys.argv[2]
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infile = sys.stdin
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outfile = sys.stdout
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r = csv.DictReader(infile)
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header = r.fieldnames
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w = csv.DictWriter(outfile, fieldnames=r.fieldnames)
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w.writeheader()
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for result in r:
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# Perform the lookup or reverse lookup if necessary
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if result[hostfield] and result[ipfield]:
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# both fields were provided, just pass it along
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w.writerow(result)
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elif result[hostfield]:
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# only host was provided, add ip
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ips = lookup(result[hostfield])
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for ip in ips:
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result[ipfield] = ip
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w.writerow(result)
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elif result[ipfield]:
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# only ip was provided, add host
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result[hostfield] = rlookup(result[ipfield])
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if result[hostfield]:
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w.writerow(result)
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main()
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