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Broken or undebugged robots

News Perl HTTP Logs Processing Scripts .htaccess file  AWStats Apache Webserver  HTTP Return Codes  mod rewrite
Requests for non-existing web pages Referrer Spam PHP probes Requests for crossdomain.xml and other XML files Mystery GET requests with URI scheme encoded PNG image in them Lower case requests Trailing junk in requests
Bangers Bots that cause consistent 500 errors Broken or undebugged robots Requests for crossdomain.xml and other XML files Frivolous POSTs Non-PHP Web probes  
Probes from bc.googleusercontent.com Fighting rogue robots Bots that couse consistent 500 errors Large Sample of "Composition URL" fake hits      
HTTP Protocol Apache authentication and authorization using LDAP Cheap Web hosting with SSH access Web site monitoring Sysadmin Horror Stories Web Humor Etc

see also Bangers

You can't even imagine what crippled junk is browsing the Web those days. Undebugged would be a severe understatement. For example

[Tue Sep 18 14:47:07 2012] [error] [client 177.99.230.22] File does not exist: /home/softpano/public_html/Hardware/Peripherals/programmable_keyboards.shtm, referer: http://www.softpanorama.org/Windows/Keyboard_and_mouse/intellitype.shtml
[Tue Sep 18 14:46:43 2012] [error] [client 177.99.230.22] File does not exist: /home/softpano/public_html/Hardware/Peripherals/programmable_keyboards.shtm, referer: http://www.softpanorama.org/Windows/keyboard_and_mouse.shtml
[Tue Sep 18 13:30:08 2012] [error] [client 219.94.243.100] File does not exist: /home/softpano/public_html/Hardware/Peripherals/programmable_keyboards.shtm, referer: http://www.softpanorama.org/Windows/Keyboard_and_mouse/mousekeys.shtml
[Tue Sep 18 13:30:05 2012] [error] [client 219.94.243.100] File does not exist: /home/softpano/public_html/Hardware/Peripherals/programmable_keyboards.shtm, referer: http://www.softpanorama.org/Windows/Keyboard_and_mouse/keyloggers.shtml
[Tue Sep 18 13:30:01 2012] [error] [client 219.94.243.100] File does not exist: /home/softpano/public_html/Hardware/Peripherals/programmable_keyboards.shtm, referer: http://www.softpanorama.org/Windows/Keyboard_and_mouse/keyboard_shortcuts.shtml
[Tue Sep 18 13:29:57 2012] [error] [client 219.94.243.100] File does not exist: /home/softpano/public_html/Hardware/Peripherals/programmable_keyboards.shtm, referer: http://www.softpanorama.org/Windows/Keyboard_and_mouse/keyboard_remapping.shtml
[Tue Sep 18 13:29:53 2012] [error] [client 219.94.243.100] File does not exist: /home/softpano/public_html/Hardware/Peripherals/programmable_keyboards.shtm, referer: http://www.softpanorama.org/Windows/Keyboard_and_mouse/AutoHotkey/index.shtml
[Tue Sep 18 13:29:49 2012] [error] [client 219.94.243.100] File does not exist: /home/softpano/public_html/Hardware/Peripherals/programmable_keyboards.shtm, referer: http://www.softpanorama.org/Windows/Keyboard_and_mouse/intellipoint.shtml
[Tue Sep 18 13:29:45 2012] [error] [client 219.94.243.100] File does not exist: /home/softpano/public_html/Hardware/Peripherals/programmable_keyboards.shtm, referer: http://www.softpanorama.org/Windows/Keyboard_and_mouse/keyboard_macrorecoders.shtml
[Tue Sep 18 13:29:40 2012] [error] [client 219.94.243.100] File does not exist: /home/softpano/public_html/Hardware/Peripherals/programmable_keyboards.shtm, referer: http://www.softpanorama.org/Windows/Keyboard_and_mouse/Clipboard_managers/pipe_text_from_shell_to_windows_clipboard.shtml
[Tue Sep 18 13:29:37 2012] [error] [client 219.94.243.100] File does not exist: /home/softpano/public_html/Hardware/Peripherals/programmable_keyboards.shtm, referer: http://www.softpanorama.org/Windows/Keyboard_and_mouse/Clipboard_managers/clip.shtml
[Tue Sep 18 13:29:33 2012] [error] [client 219.94.243.100] File does not exist: /home/softpano/public_html/Hardware/Peripherals/programmable_keyboards.shtm, referer: http://www.softpanorama.org/Windows/Keyboard_and_mouse/Clipboard_managers/arsclip.shtml
[Tue Sep 18 13:29:25 2012] [error] [client 219.94.243.100] File does not exist: /home/softpano/public_html/Hardware/Peripherals/programmable_keyboards.shtm, referer: http://www.softpanorama.org/Windows/Keyboard_and_mouse/clipboard_managers.shtml
[Tue Sep 18 13:29:20 2012] [error] [client 219.94.243.100] File does not exist: /home/softpano/public_html/Hardware/Peripherals/programmable_keyboards.shtm, referer: http://www.softpanorama.org/Windows/Keyboard_and_mouse/intellitype.shtml
[Tue Sep 18 13:29:16 2012] [error] [client 219.94.243.100] File does not exist: /home/softpano/public_html/Hardware/Peripherals/programmable_keyboards.shtm, referer: http://www.softpanorama.org/Windows/keyboard_and_mouse.shtml
 

This category included such cases as

60.12.193.43 - - [01/Sep/2012:12:00:30 -0700] "GET /Bulletin/++++++++++++++++++++++++++++++++++++++++++++Result:+%E4%E0%ED%ED%FB%E9+%F1%E0%E9%F2+%ED%E5%E4%EE%F1%F2%F3%EF%E5%ED HTTP/1.0" 404 17716 "http://www.soft    panorama.org/Bulletin/++++++++++++++++++++++++++++++++++++++++++++Result:+%E4%E0%ED%ED%FB%E9+%F1%E0%E9%F2+    %ED%E5%E4%EE%F1%F2%F3%EF%E5%ED" "Mozilla/5.0 (Windows NT 6.1; WOW64) AppleWebKit/535.19 (KHTML, like Gecko    ) Chrome/18.0.1025.168 Safari/535.19"
47 219.154.51.56 - - [01/Sep/2012:12:01:08 -0700] "GET /Bulletin/++++++++++++++++++++++++++++++++++++++++++++Result:+%E4%E0%ED%ED%FB%E9+%F1%E0%E9%F2+%ED%E5%E4%EE%F1%F2%F3%EF%E5%ED HTTP/1.0" 404 17716 "http://www.sof    tpanorama.org/Bulletin/++++++++++++++++++++++++++++++++++++++++++++Result:+%E4%E0%ED%ED%FB%E9+%F1%E0%E9%F2    +%ED%E5%E4%EE%F1%F2%F3%EF%E5%ED" "Mozilla/5.0 (Windows NT 6.1; WOW64) AppleWebKit/535.19 (KHTML, like Geck    o) Chrome/18.0.1025.168 Safari/535.19"
180.76.6.213 - - [31/Aug/2012:04:54:19 -0700] "GET /Tools//Fi...tutorial.shtml HTTP/1.1" 404 14970 "-" "Mozilla/5.0 (compatible; Baiduspider/2.0; +http://www.baidu.com/search/spider.html)"
180.76.6.20 - - [31/Aug/2012:16:29:40 -0700] "GET /History/dos HTTP/1.1" 404 15166 "-" "Mozilla/5.0 (compa    tible; Baiduspider/2.0; +http://www.baidu.com/search/spider.html)"

Typically such requests are coming from servers with no DNS records

nslookup 180.76.6.20
Server:  c.resolvers.level3.net
Address:  4.2.2.3

*** c.resolvers.level3.net can't find 180.76.6.20: Non-existent domain
But for some reason some come from respectable sources such and Ba or Yandex. Both are prone to submitting incomplete requests, especially files with no extension:
199.21.99.85 - - [31/Aug/2012:15:55:51 -0700] "GET /Bookshelf/Nyhoff1999 HTTP/1.1" 404 17197 "-" "Mozilla/    5.0 (compatible; YandexBot/3.0; +http://yandex.com/bots)"
But at least it uses servers with DNS records
nslookup 199.21.99.85
,,, ,,, ,,,
Name:    spider-199-21-99-85.yandex.com
Address:  199.21.99.85

Sometimes requests from reputable bots are outright strange. Here are several from Google:

66.249.73.204 - - [02/May/2013:00:21:50 -0700] "GET /Skeptics/Political_skeptic/Fifth_column/Humor/index.shtml?id=184751176 HTTP/1.1" 403 82 "-" "Mozilla/5.0 (compatible; Googlebot/2.1; +http://www.google.com/bot.html)"
66.249.73.204 - - [02/May/2013:07:57:36 -0700] "GET /Scripting/Perlorama/Functions/sprintf.shtml?node=print HTTP/1.1" 403 82 "-" "Mozilla/5.0 (compatible; Googlebot/2.1; +http://www.google.com/bot.html)"
66.249.73.204 - - [02/May/2013:17:24:42 -0700] "GET /Internals/@ebt-raster;hf=0;pt=3543?filename=s1065x2.gif HTTP/1.1" 403 82 "-" "Mozilla/5.0 (compatible; Googlebot/2.1; +http://www.google.com/bot.html)"
66.249.73.204 - - [02/May/2013:17:26:28 -0700] "GET /Internals/@ebt-raster;hf=0;pt=3543?filename=s1065x3.gif HTTP/1.1" 403 82 "-" "Mozilla/5.0 (compatible; Googlebot/2.1; +http://www.google.com/bot.html)"

In first two Google in its infinite wisdom used parameters such as "?id=184751176" or "?node=print". The last two look like a bug.

Some bots are definitely undebugged and can't traverse sites using relative links. For example they are unable to form correct absolute URL from relative reference.

Here is one example:

=== Hardware/Peripherals/Windows/Keyboard_and_mouse/AutoHotkey/index.shtml ===
+++ IP: 93.182.134.167 Referer: http://www.softpanorama.org/Windows/Keyboard_and_mouse/AutoHotkey/index.shtml

=== Hardware/Peripherals/Windows/Keyboard_and_mouse/keyboard_remapping.shtml ===
+++ IP: 93.182.134.167 Referer: http://www.softpanorama.org/Windows/Keyboard_and_mouse/keyboard_remapping.shtml

=== Hardware/Peripherals/Windows/Keyboard_and_mouse/keyboard_shortcuts.shtml ===
+++ IP: 93.182.134.167 Referer: http://www.softpanorama.org/Windows/Keyboard_and_mouse/keyboard_shortcuts.shtml

=== Hardware/Peripherals/Windows/Keyboard_and_mouse/keyloggers.shtml ===
+++ IP: 93.182.134.167 Referer: http://www.softpanorama.org/Windows/Keyboard_and_mouse/keyloggers.shtml

=== Hardware/Peripherals/Windows/Keyboard_and_mouse/mousekeys.shtml ===
+++ IP: 93.182.134.167 Referer: http://www.softpanorama.org/Windows/Keyboard_and_mouse/mousekeys.shtml
The other problem is incomplete file names, where part of a long file name was eaten off because of limitation of the buffer for URL or some other bug. 

Incomplete or mangled URLs

There are also semi-debugged spiders that mangle URLs. One example that I recently encounter is something that identifies itself as  360Spider. It systematically deletes underscore from the URLs with predictable results.

182.118.22.230 - - [20/Aug/2012:07:10:43 -0700] "GET /Commercialunixes/AIX/security.shtml HTTP/1.1" 404 2 4859 "http://66.172.58.15/Commercialunixes/AIX/security.shtml" "Mozilla/5.0 (Windows; U; Windows NT 5.1; zh-CN; rv:1.8.0.11) Gecko/20070312 Firefox/1.5.0.11; 360Spider"
182.118.22.227 - - [20/Aug/2012:07:10:43 -0700] "GET /DB/Oracle/connectiontooraclefromperlscripts.shtml H TTP/1.1" 404 24859 "http://66.172.58.15/DB/Oracle/connectiontooraclefromperlscripts.shtml" "Mozilla/5.0 ( Windows; U; Windows NT 5.1; zh-CN; rv:1.8.0.11) Gecko/20070312 Firefox/1.5.0.11; 360Spider"
182.118.22.227 - - [20/Aug/2012:07:10:44 -0700] "GET /Hardware/Peripherals/programmablekeyboards.shtml HT TP/1.1" 404 24859 "http://66.172.58.15/Hardware/Peripherals/programmablekeyboards.shtml" "Mozilla/5.0 (Wi ndows; U; Windows NT 5.1; zh-CN; rv:1.8.0.11) Gecko/20070312 Firefox/1.5.0.11; 360Spider"

But some bots operating under the cover of Google also suffer from this bug:

66.249.74.9 - - [17/Sep/2012:18:26:05 -0700] "GET /Net/Application.../DHCP/solaris_dhcp.shtml HTTP/1.1" 404 17950 "-" "Mediapartners-Google"
66.249.74.9 - - [17/Sep/2012:18:51:21 -0700] "GET /Social/Toxic HTTP/1.1" 404 17950 "-" "Mediapartners-Google"
66.249.74.9 - - [17/Sep/2012:18:51:22 -0700] "GET /Social/Toxic HTTP/1.1" 404 17950 "-" "Mediapartners-Google"

This media partner requests looks to me like Google bar replicating the HTTP request submitted by user reporting it to Google (one more reason to deinstall Google bar ;-)

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The Last but not Least


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Last modified: September, 12, 2017