Skip Menu |
 

This queue is for tickets about the IO-Socket-IP CPAN distribution.

Report information
The Basics
Id: 104793
Status: open
Priority: 0/
Queue: IO-Socket-IP

People
Owner: Nobody in particular
Requestors: SHLOMIF [...] cpan.org
Cc:
AdminCc:

Bug Information
Severity: (no value)
Broken in: 0.37
Fixed in: (no value)

Attachments


Subject: A TCP connection for localhost is failing if the Ethernet connection is down.
Download (untitled) / with headers
text/plain 5.3k
Hi all! When eth0 is up the following IO-Socket-IP script works fine: «««««««««««««««««««««««««««««««««««««««««««««««««««««««««««««««««««««« #!/usr/bin/perl =head1 DESCRIPTION This program based on L<IO::Socket::IP> works fine if the Ethernet interface is enabled, and fails if it isn't (while lo is still fine). OTOH, doing C<curl http://localhost:6300/notify> works. =cut use strict; use warnings; use autodie; use Socket qw(:DEFAULT :crlf); use IO::Socket::IP; my $sock = IO::Socket::IP->new( LocalHost => 'localhost', PeerHost => 'localhost', PeerPort => 6300, Type => SOCK_STREAM, ) or die "Cannot init socket - $@"; $sock->print("GET /notify$CRLF"); =head1 COPYRIGHT & LICENSE Copyright 2015 by Shlomi Fish This program is distributed under the MIT (X11) License: L<http://www.opensource.org/licenses/mit-license.php> Permission is hereby granted, free of charge, to any person obtaining a copy of this software and associated documentation files (the "Software"), to deal in the Software without restriction, including without limitation the rights to use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of the Software, and to permit persons to whom the Software is furnished to do so, subject to the following conditions: The above copyright notice and this permission notice shall be included in all copies or substantial portions of the Software. THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE. =cut »»»»»»»»»»»»»»»»»»»»»»»»»»»»»»»»»»»»»»»»»»»»»»»»»»»»»»»»»»»»»»»»»»»»»» ifconfig -a displays this: «««««««««««««««««««««««««««««««««««««««««««««««««««««««««««««««««««««« root@telaviv1:~$ ifconfig -a eth0: flags=4163<UP,BROADCAST,RUNNING,MULTICAST> mtu 1500 inet 10.0.0.5 netmask 255.255.255.0 broadcast 10.0.0.255 inet6 fe80::222:15ff:feab:3f85 prefixlen 64 scopeid 0x20<link> ether 00:22:15:ab:3f:85 txqueuelen 1000 (Ethernet) RX packets 948475 bytes 505552443 (482.1 MiB) RX errors 0 dropped 0 overruns 0 frame 0 TX packets 979625 bytes 609207173 (580.9 MiB) TX errors 0 dropped 0 overruns 0 carrier 0 collisions 0 device interrupt 20 memory 0xfe500000-fe520000 lo: flags=73<UP,LOOPBACK,RUNNING> mtu 65536 inet 127.0.0.1 netmask 255.0.0.0 inet6 ::1 prefixlen 128 scopeid 0x10<host> loop txqueuelen 0 (Local Loopback) RX packets 473772 bytes 112018554 (106.8 MiB) RX errors 0 dropped 0 overruns 0 frame 0 TX packets 473772 bytes 112018554 (106.8 MiB) TX errors 0 dropped 0 overruns 0 carrier 0 collisions 0 root@telaviv1:~$ »»»»»»»»»»»»»»»»»»»»»»»»»»»»»»»»»»»»»»»»»»»»»»»»»»»»»»»»»»»»»»»»»»»»»» However, after I do: «««««««««««««««««««««««««««««««««««««««««««««««««««««««««««««««««««««« root@telaviv1:~$ ifconfig eth0 down root@telaviv1:~$ ifconfig eth0: flags=4163<UP,BROADCAST,RUNNING,MULTICAST> mtu 1500 inet6 fe80::222:15ff:feab:3f85 prefixlen 64 scopeid 0x20<link> ether 00:22:15:ab:3f:85 txqueuelen 1000 (Ethernet) RX packets 949158 bytes 506116633 (482.6 MiB) RX errors 0 dropped 0 overruns 0 frame 0 TX packets 980204 bytes 609298209 (581.0 MiB) TX errors 0 dropped 0 overruns 0 carrier 0 collisions 0 device interrupt 20 memory 0xfe500000-fe520000 lo: flags=73<UP,LOOPBACK,RUNNING> mtu 65536 inet 127.0.0.1 netmask 255.0.0.0 inet6 ::1 prefixlen 128 scopeid 0x10<host> loop txqueuelen 0 (Local Loopback) RX packets 473799 bytes 112020336 (106.8 MiB) RX errors 0 dropped 0 overruns 0 frame 0 TX packets 473799 bytes 112020336 (106.8 MiB) TX errors 0 dropped 0 overruns 0 carrier 0 collisions 0 root@telaviv1:~$ »»»»»»»»»»»»»»»»»»»»»»»»»»»»»»»»»»»»»»»»»»»»»»»»»»»»»»»»»»»»»»»»»»»»»» I'm getting: «««««««««««««««««««««««««««««««««««««««««««««««««««««««««««««««««««««« shlomif@telaviv1:~/IO-Socket-IP-0.37$ perl -Ilib ~/progs/perl/snippets/IO-Socket-IP-test-on-localhost.pl Cannot init socket - Connection refused at /home/shlomif/progs/perl/snippets/IO-Socket-IP-test-on-localhost.pl line 19. shlomif@telaviv1:~/IO-Socket-IP-0.37$ »»»»»»»»»»»»»»»»»»»»»»»»»»»»»»»»»»»»»»»»»»»»»»»»»»»»»»»»»»»»»»»»»»»»»» However, doing: $ curl 'http://localhost:6300/notify' In this situation is working fine. Please try to reproduce and investigate this problem. I'm on Mageia Linux 5 x86-64. Regards, Shlomi Fish
Subject: IO-Socket-IP-test-on-localhost.pl
#!/usr/bin/perl =head1 DESCRIPTION This program based on L<IO::Socket::IP> works fine if the Ethernet interface is enabled, and fails if it isn't (while lo is still fine). OTOH, doing C<curl http://localhost:6300/notify> works. =cut use strict; use warnings; use autodie; use Socket qw(:DEFAULT :crlf); use IO::Socket::IP; my $sock = IO::Socket::IP->new( LocalHost => 'localhost', PeerHost => 'localhost', PeerPort => 6300, Type => SOCK_STREAM, ) or die "Cannot init socket - $@"; $sock->print("GET /notify$CRLF"); =head1 COPYRIGHT & LICENSE Copyright 2015 by Shlomi Fish This program is distributed under the MIT (X11) License: L<http://www.opensource.org/licenses/mit-license.php> Permission is hereby granted, free of charge, to any person obtaining a copy of this software and associated documentation files (the "Software"), to deal in the Software without restriction, including without limitation the rights to use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of the Software, and to permit persons to whom the Software is furnished to do so, subject to the following conditions: The above copyright notice and this permission notice shall be included in all copies or substantial portions of the Software. THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE. =cut
Download (untitled) / with headers
text/plain 334b
I suspect this may be related to getaddrinfo's AI_ADDRCONF flag. A couple of things to try: 1) Try as a test, using "127.0.0.1" instead of "localhost", which might provoke gai into bypassing that test 2) Specifically turn off that flag, by providing GetAddrInfoFlags => 0 as a constructor argument. -- Paul Evans
Download (untitled) / with headers
text/plain 3.2k
On Sat May 30 08:13:35 2015, PEVANS wrote: Show quoted text
> I suspect this may be related to getaddrinfo's AI_ADDRCONF flag. A > couple of things to try: > > 1) Try as a test, using "127.0.0.1" instead of "localhost", which might > provoke gai into bypassing that test
With this script: «««««««««««««««««««««««««««««««««««««««««««««««««««««««««««««««««««««« #!/usr/bin/perl =head1 DESCRIPTION This program based on L<IO::Socket::IP> works fine if the Ethernet interface is enabled, and fails if it isn't (while lo is still fine). OTOH, doing C<curl http://localhost:6300/notify> works. =cut use strict; use warnings; use autodie; use Socket qw(:DEFAULT :crlf); use IO::Socket::IP; my $sock = IO::Socket::IP->new( LocalHost => '127.0.0.1', PeerHost => '127.0.0.1', PeerPort => 6300, Type => SOCK_STREAM, ) or die "Cannot init socket - $@"; $sock->print("GET /notify$CRLF"); =head1 COPYRIGHT & LICENSE Copyright 2015 by Shlomi Fish This program is distributed under the MIT (X11) License: L<http://www.opensource.org/licenses/mit-license.php> Permission is hereby granted, free of charge, to any person obtaining a copy of this software and associated documentation files (the "Software"), to deal in the Software without restriction, including without limitation the rights to use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of the Software, and to permit persons to whom the Software is furnished to do so, subject to the following conditions: The above copyright notice and this permission notice shall be included in all copies or substantial portions of the Software. THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE. =cut »»»»»»»»»»»»»»»»»»»»»»»»»»»»»»»»»»»»»»»»»»»»»»»»»»»»»»»»»»»»»»»»»»»»»» I am getting this: «««««««««««««««««««««««««««««««««««««««««««««««««««««««««««««««««««««« shlomif@telaviv1:~/Download/unpack/perl/cpan/IO-Socket-IP$ perl -Ilib ~/progs/perl/snippets/IO-Socket-IP-test-on-localhost.pl Cannot init socket - Address family for hostname not supported at /home/shlomif/progs/perl/snippets/IO-Socket-IP-test-on-localhost.pl line 19. $ curl 'http://127.0.0.1:6300/notify' Success. shlomif@telaviv1:~/Download/unpack/perl/cpan/IO-Socket-IP$ »»»»»»»»»»»»»»»»»»»»»»»»»»»»»»»»»»»»»»»»»»»»»»»»»»»»»»»»»»»»»»»»»»»»»» Show quoted text
> 2) Specifically turn off that flag, by providing > GetAddrInfoFlags => 0 > as a constructor argument.
Now it's working. However, I originally ran into this problem after I used libwww-perl for doing that, using App-Notifier-Client. So the question is - what it should do? Regards, -- Shlomi Fish


This service is sponsored and maintained by Best Practical Solutions and runs on Perl.org infrastructure.

Please report any issues with rt.cpan.org to rt-cpan-admin@bestpractical.com.