[Bug 255019] ifconfig -f addr:host and ifconfig -f addr:fqdn return the same value

[bugzilla-noreply at freebsd.org]

https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=255019

            Bug ID: 255019
           Summary: ifconfig -f addr:host and ifconfig -f addr:fqdn return
                    the same value
           Product: Base System
           Version: CURRENT
          Hardware: Any
                OS: Any
            Status: New
          Severity: Affects Only Me
          Priority: ---
         Component: bin
          Assignee: bugs at FreeBSD.org
          Reporter: jcaplan at blackberry.com

Overview
--------

`ifconfig -f addr:host` does not properly truncate the fully qualify host name.

Steps to Reproduce
------------------

ifconfig vmx0 172.16.129.101/24 up
echo '172.16.129.101 dut.example.com' >> /etc/hosts
ifconfig -f addr:host vmx0 

Actual Results
--------------
inet dut.example.com netmask 0xffffff00 broadcast 172.16.129.255

Exepcted Results
----------------
inet dut netmask 0xffffff00 broadcast 172.16.129.255

Additional Information
----------------------
In getnameinfo_inet(), it seems that NI_NOFQDN flag is deliberately ignored
because it's messy to determine whether or not the host is local.

#if 0
                        /*
                         * commented out, since "for local host" is not
                         * implemented here - see RFC2553 p30
                         */
                        if (flags & NI_NOFQDN) {
                                char *p;
                                p = strchr(hp->h_name, '.');
                                if (p)
                                        *p = '\0';
                        }
#endif


If no change is made to getnameinfo_inet(), at the very least ifconfig should
perform the truncation.

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