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- It automatically downloads the results for the required country using its tld from Google. The default number of search results to download is 1000 but it is ocnfigurable and can be specified in multiples of 100 upto a maximum of 1000.
- Using regular expressions and pattern matching it searches for hostnames in the results.
- After elimination of any duplicate hostnames in the list it starts pinging them individually. At this stage the user can configure the number of pings he wants to send out to each host and the time-out value of the whole ping command. The default value is 10 sec timeout for 10 pings.
- After the results of the pings come in, the program filters out hosts which block pings and also those with multiple hostnames for the same IP address, keeping one copy for a single IP address. It also stores the min_rtt for all the hosts in the filtered list.
- Finally it checks the hosts in the filtered list on GeoIptool, again using pattern matching to show the top level domain, country, city and lat/long for each host. This information has no guarantee of being absolutely correct but on numerous occasions it was observed that it does possess a high degree of accuracy. The results at this stage can be configured by command line to be filtered optionally by either a threshold min_rtt or the top level domain of the results or both.
The program is available on SVN. You can download it by checking it out of svn using the command.
svn co file:///afs/slac.stanford.edu/g/scs/net/netmon/repo/svn/pinger/trunk/bin/HostSearcher.pl
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