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Posted to dev@tomcat.apache.org by bu...@apache.org on 2006/01/02 17:38:01 UTC
DO NOT REPLY [Bug 38100] New: - HttpServletRequest.getRemoteHost() returning invalid results
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Summary: HttpServletRequest.getRemoteHost() returning invalid
results
Product: Tomcat 5
Version: 5.5.12
Platform: PC
OS/Version: Windows XP
Status: NEW
Severity: normal
Priority: P3
Component: Connector:Coyote
AssignedTo: tomcat-dev@jakarta.apache.org
ReportedBy: cowwoc@bbs.darktech.org
This issue might be related to
http://issues.apache.org/bugzilla/show_bug.cgi?id=33971
What i am seeing is that at runtime, HttpServletRequest.getRemoteHost() is
returning invalid results. That is, it sometimes returns unqualified hostnames
(instead of an ip, which is expected if it can't get a fully-qualified
hostname). Other times it returns a hostname that has absolutely nothing to do
with the IP.
Some examples I see in my logs:
86.125.53.140 maps to msnbot.msn.com
88.7.11.140 maps to msnbot.msn.com
210.111.94.102 maps to crawl-66-249-66-138.googlebot.com
218.190.175.145 maps to msnbot.msn.com
These are all logged by the servlet being hit, with it logging: "ip " +
request.getRemoteAddr() + " maps to " + request.getRemoteHost()
Now, if you try looking up the hostname associated with the above IPs after the
fact you will notice none of them map to the hostnames that Tomcat claims it
does. I suspect that sometimes when reverse lookup fails, Tomcat retains the
rDNS result from the previous lookup instead of returning the string format of
the IP. This might also be a new bug introduced between 5.5.9 and 5.5.12 because
I don't recall having this problem with 5.5.9.
( I'm leaving the country today for a few weeks so please excuse me if I don't
reply right away to any questions you might follow up with )
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DO NOT REPLY [Bug 38100] - HttpServletRequest.getRemoteHost() returning invalid results
Posted by bu...@apache.org.
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------- Additional Comments From cowwoc@bbs.darktech.org 2006-01-02 18:28 -------
BTW: I only use the HTTP connector, not jk or apr. This is a standalone Tomcat
server.
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DO NOT REPLY [Bug 38100] - HttpServletRequest.getRemoteHost() returning invalid results
Posted by bu...@apache.org.
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------- Additional Comments From cowwoc@bbs.darktech.org 2006-01-15 23:09 -------
Have you guys had a chance to look at this issue? Any idea what piece of code
might be at fault?
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DO NOT REPLY [Bug 38100] - HttpServletRequest.getRemoteHost() returning invalid results
Posted by bu...@apache.org.
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william.barker@wilshire.com changed:
What |Removed |Added
----------------------------------------------------------------------------
Status|NEW |RESOLVED
Resolution| |FIXED
------- Additional Comments From william.barker@wilshire.com 2006-01-16 00:47 -------
This should be fixed now in the SVN trunk, and should appear in 5.5.16.
Reviewing the commit logs shows that this should have been there for a very
long time (but shouldn't happen very often).
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DO NOT REPLY [Bug 38100] - HttpServletRequest.getRemoteHost() returning invalid results
Posted by bu...@apache.org.
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------- Additional Comments From cowwoc@bbs.darktech.org 2006-01-02 19:05 -------
I went one step further and tried comparing the output of
HttpServletRequest.getRemoteHost() and InetAddress.getHostname():
String remoteHost = request.getRemoteHost();
String ip = request.getRemoteAddr();
text.append("ip " + ip + " maps to " + remoteHost);
String hostname = InetAddress.getByName(ip).getHostName();
if (!hostname.equals(remoteHost))
{
text.append(" but the actual hostname is " + hostname);
log.debug(text);
}
and got output like this:
ip 210.111.94.102 maps to vz4-vlan1.networx-bg.com but the actual hostname is
210.111.94.102
doing "nslookup" locally I clearly see that 210.111.94.102 has no reverse lookup
and that vz4-vlan1.networx-bg.com actually maps to 82.147.153.200 so now I'm
100% certain this is a Tomcat bug.
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