Hello, I may have found a reproducer and the explanation for this bug.
Reproducer ========== 1) Set a trusty VM with one NIC 2) Install tftp-hpa 3) From the VM console : $ sudo -s # service tftpd-hpa status tftpd-hpa start/running, process 867 # service tftpd-hpa stop tftpd-hpa stop/waiting # ps aux | grep tftp | grep -v grep # # ifdown eth0 # service tftpd-hpa start # ps aux | grep tftp | grep -v grep # If the NIC is down, the tftpd daemon will not start and the following will appear in /var/log/syslog : Jan 9 16:12:26 TrustyS in.tftpd[1114]: cannot resolve local IPv6 bind address: ::(Name or service not known) Starting tftpd while the network interface is still down, while rare, may happen is situation where the NIC is slow to come up or, for instance, for people using tftpd on laptop with Wifi only connectivity. This is caused by the fact that tftpd will do a call to getaddrinfo() if an IPv6 host address is set, which is the case with [::]:69. This call fails if the NIC is not configured. If no IPv6 address is set and :69 is used, the codepath reverts to INADDR_ANY which does not do the getaddrinfo(). The tftpd daemon binds correctly to the interface even if it is down as we can see : # service tftpd-hpa stop # ifdown eth0 # /usr/sbin/in.tftpd --listen --user tftp --address :69 --secure /var/lib/tftpboot # ps aux | grep tftp | grep -v grep root 1712 0.0 0.0 15120 152 ? Ss 16:25 0:00 /usr/sbin/in.tftpd --listen --user tftp --address :69 --secure /var/lib/tftpboot # lsof -i | grep tftp in.tftpd 1712 root 4u IPv4 10675 0t0 UDP *:tftp in.tftpd 1712 root 5u IPv6 10676 0t0 UDP *:tftp Debian is currently debating the same issue in https://bugs.debian.org /cgi-bin/bugreport.cgi?bug=771441 and the current option is to change the default to :69. I suggest to fix this bug by using the :69 value that will eventually also be used in debian. ** Bug watch added: Debian Bug tracker #771441 http://bugs.debian.org/cgi-bin/bugreport.cgi?bug=771441 ** Changed in: tftp-hpa (Ubuntu) Status: Expired => New ** Changed in: tftp-hpa (Ubuntu) Assignee: (unassigned) => Louis Bouchard (louis-bouchard) -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1342580 Title: tftpd-hpa doesn't start on boot To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/tftp-hpa/+bug/1342580/+subscriptions -- ubuntu-bugs mailing list [email protected] https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
