Re^2: Net::ftp && IPv6

Hello, Thanks for your feedback. The ifconfig shows the interface as:

$ /sbin/ifconfig eth0
eth0      Link encap:Ethernet  HWaddr 00:50:56:B6:53:10  
          inet addr:10.49.22.20  Bcast:10.49.22.255  Mask:255.255.255.
+0
          inet6 addr: fe80::250:56ff:feb6:5310/64 Scope:Link
          UP BROADCAST RUNNING MULTICAST  MTU:1500  Metric:1
          RX packets:12739003 errors:0 dropped:0 overruns:0 frame:0
          TX packets:4630164 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:1000 
          RX bytes:3144021160 (2998.3 Mb)  TX bytes:991348328 (945.4 M
+b)
[download]

Re/ %eth0: one has to specify in the link-local addr the interface because theoretically all interfaces could have the same addr; and I think, it is fully correct, because the perl script can connect fine and can login; but only the filetransfer does not work; I assume this is somewhere an issue in th Perl methods; if you look for the addr in the strace output, you will see, tehat the $eth0 is used in all places, but only in the last BIND not:

fgrep fe80::250:56ff:feb6:5310 tr
connect(3, {sa_family=AF_INET6, sin6_port=htons(21), inet_pton(AF_INET
+6, "fe80::250:56ff:feb6:5310", &sin6_addr), sin6_flowinfo=0, sin6_sco
+pe_id=if_nametoindex("eth0")}, 28) = -1 EINPROGRESS (Operation now in
+ progress)
connect(3, {sa_family=AF_INET6, sin6_port=htons(21), inet_pton(AF_INET
+6, "fe80::250:56ff:feb6:5310", &sin6_addr), sin6_flowinfo=0, sin6_sco
+pe_id=if_nametoindex("eth0")}, 28) = 0
getsockname(3, {sa_family=AF_INET6, sin6_port=htons(47829), inet_pton(
+AF_INET6, "fe80::250:56ff:feb6:5310", &sin6_addr), sin6_flowinfo=0, s
+in6_scope_id=if_nametoindex("eth0")}, [28]) = 0
bind(4, {sa_family=AF_INET6, sin6_port=htons(0), inet_pton(AF_INET6, "
+fe80::250:56ff:feb6:5310", &sin6_addr), sin6_flowinfo=0, sin6_scope_i
+d=0}, 28) = -1 EINVAL (Invalid argument)
[download]

Matthias

Comment on Re^2: Net::ftp && IPv6 Select or Download Code

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Re^3: Net::ftp && IPv6 by gurucubano (Initiate) on Nov 11, 2014 at 14:01 UTC
when I do a small change (hardcoded, just for test) in Net/INET6Glue/FTP.pm: `$ diff /usr/local/sisis-pap/perl5.16.2/lib/site_perl/5.16.2/Net/INET6G +lue/FTP.pm* 30c30 < LocalAddr => $ftp->sockhost, --- > LocalAddr => 'fe80::250:56ff:feb6:5310%eth0'` [download] the transfer of the data works: Net::FTP=GLOB(0x83b0080)<<< 150 Here comes the directory listing. Net::FTP=GLOB(0x83b0080)<<< 226 Directory send OK. file: file file: tr Net::FTP=GLOB(0x83b0080)>>> EPRT \|2\|fe80::250:56ff:feb6:5310\|35672\| Net::FTP=GLOB(0x83b0080)<<< 200 EPRT command successful. Consider usin +g EPSV. Net::FTP=GLOB(0x83b0080)>>> RETR file Net::FTP=GLOB(0x83b0080)<<< 150 Opening BINARY mode data connection fo +r file (12 bytes). Net::FTP=GLOB(0x83b0080)<<< 226 File send OK. Net::FTP=GLOB(0x83b0080)>>> QUIT Net::FTP=GLOB(0x83b0080)<<< 221 Goodbye. [download] this underpins that somehow on the way down the %eth0 is droped off the $ftp->sockhost;	[reply] [d/l] [select]
Re^4: Net::ftp && IPv6 by Loops (Curate) on Nov 11, 2014 at 14:19 UTC
Strange. It all just works here in passive mode, and the non-passive case is explainable. When I add the following print to your code, i get the %eth0: `my $ftp = Net::FTP->new($ipaddr, Debug=>1, Passive=>1) or die "Can't c +onnect: $@\n"; print $ftp->sockhost;` [download] I'm guessing by this point it's already missing for you? Using Net::FTP 3.02 and IO::Socket::INET is 1.35 here. As a digression, my ifconfig shows a scope id of "2" for my eth0 device. When I then use %2 at the end of the ip address, Net::FTP automatically replaces it with %eth0. While that's new to me, it's obviously supported. However Net::FTP violates RFC 2428 by including that in the EPRT command in the non-passive case. I had to do rule rewriting in my Proftpd server to strip it off before things would work.	[reply] [d/l]
Re^5: Net::ftp && IPv6 by gurucubano (Initiate) on Nov 12, 2014 at 12:43 UTC
After updating libnet to version 3.02 and IO-Socket-IP to 0.32 it works as it should, $ftp->sockhost returns the IP addr with the %eth0 at the end and FTP works fine; Thread end, thanks	[reply]