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Date:      Tue, 12 Jul 2016 16:23:18 +0000
From:      bugzilla-noreply@freebsd.org
To:        freebsd-ports-bugs@FreeBSD.org
Subject:   [Bug 211038] security/xinetd: Broken with dgram udp services (e.g. tftpd, tftp-proxy)
Message-ID:  <bug-211038-13@https.bugs.freebsd.org/bugzilla/>
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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=3D211038

            Bug ID: 211038
           Summary: security/xinetd: Broken with dgram udp services (e.g.
                    tftpd, tftp-proxy)
           Product: Ports & Packages
           Version: Latest
          Hardware: Any
                OS: Any
            Status: New
          Severity: Affects Some People
          Priority: ---
         Component: Individual Port(s)
          Assignee: sem@FreeBSD.org
          Reporter: garga@FreeBSD.org
          Assignee: sem@FreeBSD.org
             Flags: maintainer-feedback?(sem@FreeBSD.org)

xinetd is not working on FreeBSD 10.3 and 12.0-CURRENT with dgram UDP servi=
ces
like tftp server or tftp-proxy.

Sample config:

service tftp
{
        disable =3D no
        port =3D 69
        socket_time =3D dgram
        protocol =3D udp
        wait =3D yes
        user =3D root
        group =3D wheel
        server =3D /usr/libexec/tftpd
        server_args =3D -d 15 -l -s /tftpboot
}

xinetd logs:

16/7/12@12:36:10: DEBUG: 15844 {main_loop} select returned 1
16/7/12@12:36:10: DEBUG: 15844 {svc_suspend} Suspended service tftp
16/7/12@12:36:10: DEBUG: 15844 {server_start} Starting service tftp
16/7/12@12:36:10: DEBUG: 15844 {main_loop} active_services =3D 0
16/7/12@12:36:10: DEBUG: 15845 {exec_server} duping 0
16/7/12@12:36:10: DEBUG: 15844 {main_loop} active_services =3D 0
16/7/12@12:36:10: DEBUG: 15844 {main_loop} select returned 1
16/7/12@12:36:10: DEBUG: 15844 {check_pipe} Got signal 20 (Child exited)
16/7/12@12:36:10: DEBUG: 15844 {child_exit} waitpid returned =3D 15845
16/7/12@12:36:10: DEBUG: 15844 {server_end} tftp server 15845 exited
16/7/12@12:36:10: DEBUG: 15844 {drain} UDP socket should be empty
16/7/12@12:36:10: DEBUG: 15844 {svc_resume} Resumed service tftp
16/7/12@12:36:10: DEBUG: 15844 {child_exit} waitpid returned =3D -1
16/7/12@12:36:10: DEBUG: 15844 {main_loop} active_services =3D 1

tftpd logs:

Jul 12 12:36:10 tp tftpd[15845]: recvfrom: Resource temporarily unavailable

tftp-proxy logs:

Jul 11 17:12:39 test-ce-23-amd64 tftp-proxy[38884]: setsockopt(IP_RECVDSTAD=
DR):
Protocol not available

It was first reported on pfSense, then I reproduced it on stock FreeBSD as
well.

Ref: https://redmine.pfsense.org/issues/6315

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