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From "Sebb (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (NET-650) IMAPClient over proxy doesn't properly resolve DNS
Date Fri, 26 Jan 2018 23:12:00 GMT

    [ https://issues.apache.org/jira/browse/NET-650?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16341770#comment-16341770
] 

Sebb commented on NET-650:
--------------------------

Thanks for the info.

I left a bit out:
{code}
_socket_ = _socketFactory_.createSocket(); // add this line
_socket_.connect(endpoint, connectTimeout); // before this
{code}

That should fix the NPE.

AFAICT the difference between InetSocketAddress and InetAddress is that the former allows
the IP address to be unresolved.
In which case the Socket is passed the hostname instead of an IP address.

This brings up something else: it's possible that the hostname has different values on the
local and far side of the proxy, so I think any fix would need to take that into account.

> IMAPClient over proxy doesn't properly resolve DNS
> --------------------------------------------------
>
>                 Key: NET-650
>                 URL: https://issues.apache.org/jira/browse/NET-650
>             Project: Commons Net
>          Issue Type: Bug
>          Components: IMAP
>    Affects Versions: 3.6
>            Reporter: Matthew McGillis
>            Priority: Major
>         Attachments: imapproxy.java, imapproxy2.java, socketproxy.java
>
>
> IMAPClient when configured to use a socks proxy is not able to resolve DNS names through
the proxy.
> See attached sample code, if I use it with:
> {noformat}
> $ java -DsocksProxyHost=localhost -DsocksProxyPort=16003 -cp .:./commons-net-3.6.jar
imapproxy imap.server.test.com user1 userpass
> connect error: java.net.UnknownHostException: imap.server.test.com: unknown error
> {noformat}
> vs if I use it with the appropriate IP:
> {noformat}
> $ java -DsocksProxyHost=localhost -DsocksProxyPort=16003 -cp .:./commons-net-3.6.jar
imapproxy 10.250.3.127 user1 userpass
> * OK IMAP4rev1 proxy server ready
> IMAP: 10.250.3.127 143
> AAAA LOGIN *******
> AAAA OK [CAPABILITY IMAP4rev1 ACL BINARY CATENATE CHILDREN CONDSTORE ENABLE ESEARCH ESORT
I18NLEVEL=1 ID IDLE LIST-EXTENDED LIST-STATUS LITERAL+ LOGIN-REFERRALS MULTIAPPEND NAMESPACE
QRESYNC QUOTA RIGHTS=ektx SASL-IR SEARCHRES SORT THREAD=ORDEREDSUBJECT UIDPLUS UNSELECT WITHIN
XLIST] LOGIN completed
> AAAB LOGOUT
> * BYE 10.250.3.127 Zimbra IMAP4rev1 server closing connection
> AAAB OK LOGOUT completed
> {noformat}



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