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- See documentation.
- Following are some common errors to watch out for:
-
-
- It doesn't work together with Storable::fd_retrieve|fd_store, see
- https://rt.cpan.org/Ticket/Display.html?id=23419.
- You need to use freeze/nfreeze/thaw and syswrite/sysread the data
- yourself. See the bug for examples how to do it.
-
- ---------------------
-
- If you get an SSL connection but not certificate you might check
- the cipher with Net::SSLeay::get_cipher( $socket->_get_ssl_object ).
- If it is something like 'ADH-AES256-SHA' you should try to disable
- ADH in your cipherlist, e.g. set SSL_cipherlist to 'ALL:!ADH'
- or just leave it empty so that it uses the openssl default
- which does not include ADH.
-
- ---------------------
-
- There is a problem with openssl versions 0.9.8a and 0.9.8b, see
- http://marc.theaimsgroup.com/?l=openssl-dev&m=113550694922967&w=2
- The bug was fixed in newer releases, but if you are forced to use
- these buggy versions you should apply a patch to Net::SSLeay 1.30,
- see http://rt.cpan.org/Public/Bug/Display.html?id=22910.
-
- ---------------------
-
- IO::Socket::SSL does not currently support using both IPv4 and IPv6 in
- the same program. For a quick workaround, copy the module 'SSL.pm' to
- another named 'SSL6.pm' and adjust the package declaration
- accordingly. Support for this feature is planned in the next release.
-
- ---------------------
-
- If you plan on having IO::Socket::SSL sockets auto-close themselves
- when they go out of scope (like LWP::UserAgent expects), you will
- need to get Scalar::Util or WeakRef from CPAN (Scalar::Util comes
- standard with Perl 5.8.0 and above). This is because the self-tying
- mechanism that IO::Socket::SSL uses to appear simultaneously as an
- object and a glob reference only works if a circular reference is
- used.
-
- ---------------------
-
- Note that a random number generator is required for the proper
- operation of this module. Systems that have /dev/random or
- /dev/urandom are fine, but those that do not, like most versions
- of Solaris, will need to fetch one before installing IO::Socket::SSL.
- If you don't already have a favorite, try EGD (egd.sourceforge.net).
-
- ---------------------
-
- Versions of perl-ldap below v0.26 do not work with this version
- of IO::Socket::SSL because they contain a workaround for old
- versions of IO::Socket::SSL that breaks new versions.
-
- ---------------------
-
- Note that when writing a preforking server (a server that accepts a
- connection and then hands it off to a child for processing), it is
- best to handle SSL negotiation after the socket has been passed to
- the child (using socket_to_SSL()). If implemented so that the server
- handles negotiation, a failed negotiation may tie up the server until
- the connection times out.
-
- ---------------------
-
- One user mentioned that the following did not work as it should in
- IO::Socket::SSL, but worked in IO::Socket::INET:
-
- chomp($var = <$socket>);
- print ord(chop($var)); # Prints "10" for people using ASCII
-
- This is due to a bug in Perl that is fixed in 5.8.1. If you need
- a workaround, try one of the following:
-
- chomp($var = $socket->getline());
- chomp($var = scalar <$socket>);
- chomp($var = $var = <$socket>);
-
- Any function that returns the value of <$socket> (in scalar context)
- unchanged will work.
-
- ---------------------
-
- If you have 384-bit RSA keys you need to use Diffie Hellman Key Exchange.
- See the parameter SSL_dh_file or SSL_dh for how to use it and
- http://groups.google.de/group/mailing.openssl.users/msg/d60330cfa7a6034b
- for an explanation why you need it.
-
- --
- Peter Behroozi (behrooz at fas.harvard.edu)
- Steffen Ullrich (Steffen_Ullrich at genua.de)
-