Fixed in Ubuntu 18.04 LTS bionic, so I propose to close this. ** Changed in: netcat-openbsd (Ubuntu) Status: New => Fix Released
-- You received this bug notification because you are a member of Ubuntu Touch seeded packages, which is subscribed to netcat-openbsd in Ubuntu. https://bugs.launchpad.net/bugs/1786756 Title: netcat-openbsd broadcast not working Status in netcat-openbsd package in Ubuntu: Fix Released Bug description: OS: Ubuntu Xenial Ubuntu 16.04.5 LTS Package: netcat-openbsd 1.105-7ubuntu1 I want to send broadcasts over the loopback device: $ nc -vu 127.255.255.255 1024 nc: connect to 127.255.255.255 port 1024 (udp) failed: Permission denied This does not work since the broadcast socket option hasn't been enabled which is also correct. So I retry with: $ nc -vbu 127.255.255.255 1024 nc: Protocol not available This is strange. Doing an strace reveals the reason: $ strace nc -u 127.255.255.255 1024 ... socket(PF_INET, SOCK_DGRAM, IPPROTO_UDP) = 3 fcntl(3, F_GETFL) = 0x2 (flags O_RDWR) fcntl(3, F_SETFL, O_RDWR|O_NONBLOCK) = 0 connect(3, {sa_family=AF_INET, sin_port=htons(1024), sin_addr=inet_addr("127.255.255.255")}, 16) = -1 EACCES (Permission denied) fcntl(3, F_SETFL, O_RDWR) = 0 close(3) = 0 close(-1) = -1 EBADF (Bad file descriptor) exit_group(1) = ? +++ exited with 1 +++ Okay, but now with "b": $ strace nc -bu 127.255.255.255 1024 ... socket(PF_INET, SOCK_DGRAM, IPPROTO_UDP) = 3 setsockopt(3, SOL_TCP, TCP_KEEPCNT, [1], 4) = -1 ENOPROTOOPT (Protocol not available) write(2, "nc: ", 4nc: ) = 4 write(2, "Protocol not available\n", 23Protocol not available ) = 23 exit_group(1) = ? +++ exited with 1 +++ This is very amazing: why does a TCP socket option get set when I am requesting the broadcast mode? I have analysed the original Debian package where the broadcast option gets added (the original OpenBSD package misses it), but the respective integration patch seems correct to me (0010-misc-failures-and-features.patch). Package page: https://packages.debian.org/stretch/netcat-openbsd ProblemType: Bug DistroRelease: Ubuntu 16.04 Package: netcat-openbsd 1.105-7ubuntu1 ProcVersionSignature: Ubuntu 4.15.0-30.32~16.04.1-generic 4.15.18 Uname: Linux 4.15.0-30-generic x86_64 ApportVersion: 2.20.1-0ubuntu2.18 Architecture: amd64 CurrentDesktop: X-Cinnamon Date: Mon Aug 13 11:31:28 2018 Dependencies: gcc-7-base 7.2.0-8ubuntu3.2 [origin: TUXEDO Computers] libbsd0 0.8.2-1 libc6 2.23-0ubuntu10 libgcc1 1:7.2.0-8ubuntu3.2 [origin: TUXEDO Computers] EcryptfsInUse: Yes SourcePackage: netcat-openbsd UpgradeStatus: No upgrade log present (probably fresh install) To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/netcat-openbsd/+bug/1786756/+subscriptions -- Mailing list: https://launchpad.net/~touch-packages Post to : touch-packages@lists.launchpad.net Unsubscribe : https://launchpad.net/~touch-packages More help : https://help.launchpad.net/ListHelp