[NET-650] IMAPClient over proxy doesn't properly resolve DNS

• Type: Bug
• Status: Resolved
• Priority: Major
• Resolution: Fixed
• Affects Version/s: 3.6
• Fix Version/s: 3.10.0
• Component/s: IMAP
• Assignee: Unassigned
• Reporter: Matthew McGillis
• Created: 11/Jan/18 21:02
• Updated: 07/Oct/23 18:51
• Resolved: 09/Jan/23 13:41

Description

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:

$ 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

vs if I use it with the appropriate IP:

$ 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

Issue Links

• relates to: NIFI-12188 Upgrade Apache Commons Net to 3.10.0
• links to: GitHub Pull Request #138