[Bug 243723] security/ossec-hids-agent: ossec-agentd: ERROR: msgbuf_write() error: Broken pipe (0x1)

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=243723

            Bug ID: 243723
           Summary: security/ossec-hids-agent: ossec-agentd: ERROR:
                    msgbuf_write() error: Broken pipe (0x1)
           Product: Ports & Packages
           Version: Latest
          Hardware: Any
                OS: Any
            Status: New
          Severity: Affects Some People
          Priority: ---
         Component: Individual Port(s)
          Assignee: ports-bugs at FreeBSD.org
          Reporter: egypcio at FreeBSD.org

ossec v3.5.0 does not work as expected under FreeBSD. rolling back it to
previous version (v3.3.0) fixes the problem.

# uname -UKrips
FreeBSD 12.1-STABLE amd64 GENERIC 1201510 1201510

# pkg info -x oss
ossec-hids-agent-3.5.0
ossec-hids-agent-config-3.5.0

# /usr/local/ossec-hids/bin/ossec-agentd -d -f
 ...
2020/01/30 11:14:04 ossec-agentd [dns]: ERROR: socket error
2020/01/30 11:14:04 ossec-agentd: INFO: Trying to connect to server 10.0.5.16,
port 1514.
2020/01/30 11:14:04 ossec-agentd: ERROR: msgbuf_write() error: Broken pipe
(0x1)
2020/01/30 11:14:04 ossec-agentd: WARN: n == 0
2020/01/30 11:14:04 ossec-agentd: WARN2: n == 0
2020/01/30 11:14:04 ossec-agentd: ERROR Wrong imsg type.
2020/01/30 11:14:04 ossec-agentd [dns]: ERROR: socket error
2020/01/30 11:14:04 ossec-agentd: INFO: Trying to connect to server 10.0.5.16,
port 1514.
2020/01/30 11:14:04 ossec-agentd: ERROR: msgbuf_write() error: Broken pipe
(0x1)
^C2020/01/30 11:14:04 ossec-agentd(1225): INFO: SIGNAL [(2)-(Interrupt)]
Received. Exit Cleaning...

it's definitely *NOT* an issue with DNS config or packet filtering, once just
reverting OSSEC to its previous version fixes the problem.

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