IPv6 Support

[alancarwile]

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The notes below describe what was done in getting pam_radius_auth.so to the point of supporting IPv6. In addition to adding IPv6 support, a TRACE facility was added, hardtab/whitespace was cleaned up, and some bug fixes were made.

Following is a rough breakdown of the changes:

• Began with 1.3.17 from tar.gz, which did not include a few changes in the github repo. o Those changes were applied at the end of the project (see below).
• Removed hard tab characters using vim's :se ts=8 and :se ts=4 and :1,.retab in sections o Did not realign all text to use same indent rules. Just removed hard tabs.
• Code changes to reach a first snapshot of IPv6 support: o Can now handle radius server names that resolve to IPv6 (or IPv4) o Can still of course handle IPv4 addresses o Does not yet handle IPv6 addresses completely due to bracket parsing work to be completed o Replaced IPv4-only gethostbyname calls with getaddrinfo calls o Switched from sockaddr/sockaddr_in IPv4-only to generic sockaddr_storage which handles IPv4/IPv6 o Set IPV6_V6ONLY to off, allowing one IPv6 socket to handle IPv6 and IPv4 communication. o Commented out no-longer needed IPv4-only validation code (comments in source for this change). o Added TRACEPRINT to aid with development, debugging, and learning how pam_radius_auth works.
• Near final snapshot: o Implemented bracket handling etc. to support []:port form where :port is still optional. o IPv6 address can be abbreviated forms, such as [fdca:1:2:3::4]:1812 o Improved debug output around port lookup to prevent some failures on odd input in server config file o Modify Makefile to build normal shared library and a trace version using -DTRACEON o Add comments in less obvious parts of code especially where I made changes.
• Merged in changes from latest github master version of this project, current as of 5/19/2013.
• Trace version of library: o Modified the Makefile to build a second library, pam_radius_auth_trace.so with tracing enabled. * The trace version can be renamed at runtime to give more debug/trace output if needed.
• Testing: o Tested with names, IPv6 addresses, and IPv4 addresses against freeradius 2.2 o Tested with names, IPv6 addresses, and IPv4 addresses against Windows 2008 NPS o Tested with names and IPv4 addresses against freeradius 2.1 and Windows 2003 IAS * freeradius 2.1 and Windows 2003 IAS do not support IPv6.
• Contact info: alan.d.carwile@gmail.com AC Network Software alan.carwile@hds.com Hitachi Data Systems
• Credit also to Kentaro Aoki, whose code changes were referenced and helpful along the way. o http://code.google.com/p/pam-radius-ipv6/

[alancarwile]

Discussed and agreed it would be more helpful to close this pull request, and submit a new one based on a branch that breaks down the work into a series of stages (series of commits, e.g., beginning with whitespace changes, etc.). The change will facilitate review/verification of the changes proposed to be merged into the main branch. So, closing this pull request.