Hacking INN

    This file is for people who are interested in making modifications to
    INN.  Normal users can safely skip reading it.  It is intended primarily
    as a guide, resource, and accumulation of tips for maintainers and
    contributors, and secondarily as documentation of some of INN's
    internals.

    This is $Revision: 7736 $ dated $Date: 2006-04-15 04:52:06 +0200 (Sat,
    15 Apr 2006) $.

    First of all, if you plan on working on INN source, please start from
    the current development tree.  There may be significant changes from the
    previous full release, so starting from development sources will make it
    considerably easier to integrate your work.  You can get nightly
    snapshots of the current development source from ftp.isc.org in
    /isc/inn/snapshots (the snapshots named inn-CURRENT-*.tar.gz), or you
    can get the current CVS tree by using CVSup (see "Using CVSup").

Configuring and Portability

    All INN code should be written expecting ANSI C and POSIX.  There is no
    need to attempt to support pre-ANSI compilers, and ANSI-only features
    such as <stdarg.h>, string concatenation, #elif, and token pasting may
    be used freely.  So far as possible, INN is written to attempt to be
    portable to any system new enough that someone is likely to want to run
    a news server on it, but whenever possible this portability should be
    provided by checking for standard behavior in configure and supplying
    replacements for standard functions that are missing.

    When there is a conflict between ANSI C and C99, INN code should be
    written expecting C99 and autoconf used to patch up the differences.

    Try to avoid using #ifdef and the like in the middle of code as much as
    possible.  Instead, try to isolate the necessary portability bits and
    include them in libinn or at least in conditional macros separate from
    the code.  Trying to read code littered with conditional compilation
    directives is much more difficult.

    The shell script configure at the top level of the source tree is
    generated by autoconf from configure.in, and include/config.h.in is
    generated by autoheader from configure.in and include/acconfig.h.  At
    configure time, configure generates include/config.h and several other
    files based on options it was given and what it discovers about the
    target system.

    All modifications to configure should instead be made to configure.in. 
    Similarly, modifications to include/config.h.in should instead be made
    to include/acconfig.h.  The autoconf manual (available using info
    autoconf if you have autoconf and the GNU info utilities installed on
    your system) is a valuable reference when making any modifications.

    To regenerate configure, just run "autoconf".  To regenerate
    include/config.h.in, run:

        autoheader -l include

    to tell it where to find acconfig.h.  Please don't include patches to
    either configure or include/config.h.in when sending patches to INN;
    instead, note in your patch that those files must be regenerated.

    The generated files are checked into the CVS repository so that people
    working on INN don't have to have autoconf on their system, and to make
    packaging easier.

    At the time of this writing, autoconf 2.13 is required.

    The supporting files for autoconf are in the support subdirectory,
    including the files config.guess and config.sub to determine the system
    name and and ltmain.sh for libtool support.  The latter file comes from
    the libtool distribution; the canonical version of the former two are
    available from ftp.gnu.org in /gnu/config.  In addition, m4/libtool.m4
    is just a copy of libtool.m4 from the libtool distribution.  (Using
    libtool without using automake requires a few odd hacks.)  These files
    used to be on a separate vendor branch so that we could make local
    modifications, but local modifications have not been necessary for some
    time.  Now, new versions can just be checked in like any other file
    modifications.

    INN should not compile with libtool by default, only when requested,
    since otherwise normal compilations are quite slow.  (Using libtool is
    not without some cost.)  Basic compilation with libtool works fine as of
    this writing, with both static and shared compiles, but the dependencies
    aren't quite right for make -j using libtool.

Documentation

    INN's documentation is currently somewhat in a state of flux.  The vast
    majority is still in the form of man pages written directly in nroff. 
    Some parts of the documentation have been rewritten in POD; that
    documentation can be found in doc/pod.  The canonical source for README,
    INSTALL, NEWS, doc/hook-perl, doc/hook-python, and this file are also in
    POD.

    If you're modifying some part of INN's documentation and see that it has
    a POD version in doc/pod, it's preferred if you can make the
    modifications to the POD source and then regenerate the derived files. 
    For a quick introduction to POD, see the perlpod(1) man page on your
    system (it should be installed if you have Perl installed).

    When writing new documentation, write in whatever format you care to; if
    necessary, we can always convert it to POD or whatever else we want to
    use.  Having the documentation exist in *some* form is more important
    than what language you write it in.  If you really don't have any
    particular preference, there's a slight preference currently for POD.

    If you use POD or regenerate POD documentation, please install something
    close to the latest versions of the POD processing utilities to avoid
    changes to the documentation depending on who generated it last.  You
    can find the latest version on CPAN (ftp.perl.org or another mirror) in
    modules/by-module/Pod.  You'll need PodParser (for versions of Perl
    before 5.6.1; 5.6.1 and later come with a recent enough version) and the
    latest version of podlators.  For versions of Perl earlier than 5.005,
    you'll also need File::Spec in modules/by-module/File.

    podlators 1.25 or later will build INN's documentation without
    significant changes from the versions that are checked into the
    repository.

    There are Makefile rules in doc/pod/Makefile to build all of the
    documentation whose master form is POD; if you add additional
    documentation, please add a rule there as well.  Documentation should be
    generated by cd'ing to doc/pod and typing "make file" where "file" is
    the relative path to the documentation file.  This will get all of the
    various flags right for pod2text or pod2man.

Error Handling

    INN has a set of generic error handling routines that should be used as
    much as possible so that the same syntax can be used for reporting
    errors everywhere in INN.  The four basic functions are warn, syswarn,
    die, and sysdie; warn prints or logs a warning, and die does the same
    and then exits the current program.  The sys* versions add a colon, a
    space, and the value of strerror(errno) to the end of the message, and
    should be used to report failing system calls.

    All of the actual error reporting is done via error handlers, and a
    program can register its own handlers in addition to or instead of the
    default one.  The default error handler (error_log_stderr) prints to
    stderr, prepending the value of error_program_name if it's set to
    something other than NULL.  Three other error handlers are available,
    error_log_syslog_crit, error_log_syslog_err, and
    error_log_syslog_warning, which log the message to syslog at LOG_CRIT,
    LOG_ERR, or LOG_WARNING priority, respectively.

    There is a different set of error handlers for warn/syswarn and
    die/sysdie.  To set them, make calls like:

        warn_set_handlers(2, error_log_stderr, error_log_syslog_warning);
        die_set_handlers(2, error_log_stderr, error_log_syslog_err);

    The first argument is the number of handlers, and the remaining
    arguments are pointers to functions taking an int (the length of the
    formatted message), a const char * (the format), a va_list (the
    arguments), and an int that's 0 if warn or die was called and equal to
    the value of errno if syswarn or sysdie was called.  The length of the
    formatted message is obtained by calling vsnprintf with the provided
    format and arguments, and therefore is reliable to use as the size of a
    buffer to malloc to hold the result of formatting the message provided
    that vsnprintf is used to format it (warning: the system vsprintf may
    produce more output under some circumstances, so always use vsnprintf).

    The error handler can do anything it wishes; each error handler is
    called in the sequence given.  Error handlers shouldn't call warn or die
    unless great caution is taken to prevent infinite recursion.  Also be
    aware that sysdie is called if malloc fails in xmalloc, so if the error
    handler needs to allocate memory, it must not use xmalloc or a related
    function to do so and it shouldn't call die to report failure.  The
    default syslog handlers report memory allocation failure to stderr and
    exit.

    Finally, die and sysdie support an additional handler that's called
    immediate before exiting, takes no arguments, and returns an int which
    is used as the argument for exit.  It can do any necessary global
    cleanup, call abort instead to generate a core dump or the like.

    The advantage of using this system everywhere in INN is that library
    code can use warn and die to report errors and each calling program can
    set up the error handlers as appropriate to make sure the errors go to
    the right place.  The default handler is fine for interactive programs;
    for programs that run from interactive scripts, adding something like:

        error_program_name = "program";

    to the beginning of main (where program is the name of the program) will
    make it easier to figure out which program the script calls is failing. 
    For programs that may also be called non-interactively, like inndstart,
    one may want to set up handlers like:

        warn_set_handlers(2, error_log_stderr, error_log_syslog_warning);
        die_set_handlers(2, error_log_stderr, error_log_syslog_err);

    Finally, for daemons and other non-interactive programs, one may want to
    do:

        warn_set_handlers(1, error_log_syslog_warning);
        die_set_handlers(1, error_log_syslog_err);

    to report errors only via syslog.  (Note that if you use syslog error
    handlers, the program should call openlog first thing to make sure they
    are logged with the right facility.)

    For historical reasons, error messages that are fatal to the news
    subsystem are logged at the LOG_CRIT priority, and therefore die in innd
    should use error_log_syslog_crit.

Test Suite

    The test suite for INN is located in the tests directory and is just
    getting started.  The test suite consists of a set of programs listed in
    tests/TESTS and the scaffolding in the runtests program.

    Adding new tests is very straightforward and very flexible.  Just write
    a program that tests some part of INN, put it in a directory under tests
    named after the part of INN it's testing (all the tests so far are in
    lib because they're testing libinn routines), and have it output first a
    line containing the count of test cases in that file, and then for each
    test a line saying "ok n" or "not ok n" where n is the test case number.
    (If a test is skipped for some reason, such as a test of an optional
    feature that wasn't compiled into INN, the test program should output
    "ok n # skip".)  Add any rules necessary to build the test to
    tests/Makefile (note that for simplicity it doesn't recurse into
    subdirectories) and make sure it creates an executable ending in .t. 
    Then add the name of the test to tests/TESTS, without the .t ending.

    One naming convention:  to distinguish more easily between e.g. 
    lib/error.c (the implementation) and tests/lib/error-t.c (the test
    suite), we add -t to the end of the test file names.  So
    tests/lib/error-t.c is the source that compiles into an executable
    tests/lib/error.t which is run by putting a line in tests/TESTS of just
    "lib/error".

    Note that tests don't have to be written in C; in fact, lib/xmalloc.t is
    just a shell script (that calls a supporting C program).  Tests can be
    written in shell or Perl (but other languages should be avoided because
    someone who wants to run the test suite may not have it) and just have
    to follow the above output conventions.

    Additions to the test suite, no matter how simple, are very welcome.

Makefiles

    All INN makefiles include Makefile.global at the top level, and only
    that makefile is a configure substitution target.  This has the
    disadvantage that configure's normal support for building in a tree
    outside of the source tree doesn't work, but it has the significant
    advantage of making configure run much faster and allowing one to run
    make in any subdirectory and pick up all the definitions and settings
    from the top level configuration.

    All INN makefiles should also set $(top) to be the path to the top of
    the build directory (usually relative).  This path is used to find
    various programs like fixscript and libtool so that the same macros (set
    in Makefile.global) can be used all over INN.

    The format of INN's makefiles is mostly standardized; the best examples
    of the format are probably frontends/Makefile and backends/Makefile, at
    least for directories with lots of separate programs.  The ALL variable
    holds all the files that should be generated, EXTRA those additional
    files that were generated by configure, and SOURCES the C source files
    for generating tag information.

    There are a set of standard installation commands defined in make
    variables by Makefile.global, and these should be used for all file
    installations.  See the comment blocks in Makefile.global.in for
    information on what commands are available and when they should be used.
    There are also variables set for each of the installation directories
    that INN uses, for use in building the list of installed paths to files.

    Each subdirectory makefile should have the targets all (the default),
    clean, clobber, install, tags, and profiled.  The tags target generates
    vi tags files, and the profiled target generates a profiling version of
    the programs (although this hasn't been tested much recently).  These
    rules should be present and empty in those directories where they don't
    apply.

    Be sure to test compiling with both static and dynamic libraries and
    make sure that all the libtool support works correctly.  All linking
    steps, and the compile steps for all library source, should be done
    through $(LIBTOOL) (which will be set to empty in Makefile.global if
    libtool support isn't desired).

Scripts

    INN comes with and installs a large number of different scripts, both
    Bourne shell and Perl, and also comes with support for Tcl scripts
    (although it doesn't come with any).  Shell variables containing both
    configure-time information and configuration information from inn.conf
    are set by the innshellvars support libraries, so the only
    system-specific configuration that should have to be done is fixing the
    right path to the interpretor and adding a line to load the appropriate
    innshellvars.

    support/fixscript, built by configure, does this.  It takes a .in file
    and generates the final script (removing the .in) by fixing the path to
    the interpretor on the first line and replacing the second line,
    whatever it is, with code to load the innshellvars appropriate for that
    interpretor.  (If invoked with -i, it just fixes the interpretor path.)

    Scripts should use innshellvars (via fixscript) to get the right path
    and the right variables whenever possible, rather than having configure
    substitute values in them.  Any values needed at run-time should instead
    be available from all of the different innshellvars.

    See the existing scripts for examples of how this is done.

Include Files

    Include files relevant to all of INN, or relevant to the two libraries
    built as part of INN (the utility libinn library and the libstorage
    library that contains all storage and overview functions) are found in
    the include directory; other include files relevant only to a portion of
    INN are found in the relevant directory.

    Practically all INN source files will start with:

        #include "config.h"
        #include "clibrary.h"

    The first picks up all defines generated by autoconf and is necessary
    for types that may not be present on all systems (uid_t, pid_t, size_t,
    int32_t, and the like).  It therefore should be included before any
    other headers that use those types, as well as to get general
    configuration information.

    The second is portably equivalent to:

        #include <sys/types.h>
        #include <stdarg.h>
        #include <stdio.h>
        #include <stdlib.h>
        #include <stddef.h>
        #include <stdint.h>
        #include <string.h>
        #include <unistd.h>

    except that it doesn't include headers that are missing on a given
    system, replaces functions not found on the system with the INN
    equivalents, provides macros that INN assumes are available but which
    weren't found, and defines some additional portability things.  Even if
    this is more headers than the source file actually needs, it's generally
    better to just include clibrary.h rather than trying to duplicate the
    autoconf-driven hackery that it does to do things portably.  The primary
    exception is for source files in lib that only define a single function
    and are used for portability; those may want to include only config.h so
    that they can be easily used in other projects that use autoconf. 
    config.h is a fairly standard header name for this purpose.

    clibrary.h does also include config.h, but it's somewhat poor form to
    rely on this; it's better to explicitly list the header dependencies for
    the benefit of someone else reading the code.

    There are portable wrappers around several header files that have known
    portability traps or that need some fixing up on some platforms.  Look
    in include/portable and familiarize yourself with them and use them
    where appropriate.

    Another frequently included header file is libinn.h, which among other
    things defines xmalloc(), xrealloc(), xstrdup(), and xcalloc(), which
    are checked versions of the standard memory allocation routines that
    terminate the program if the memory allocation fails.  These should
    generally always be used instead of the regular C versions.  libinn.h
    also provides various other utility functions that are frequently used.

    paths.h includes a wide variety of paths determined at configure time,
    both default paths to various parts of INN and paths to programs.  Don't
    just use the default paths, though, if they're also configurable in
    inn.conf; instead, call ReadInnConf() and use the global innconf
    structure.

    Other files in include are interfaces to particular bits of INN library
    functionality or are used for other purposes; see the comments in each
    file.

    Eventually, the header files will be separated into installed header
    files and uninstalled header files; the latter are those headers that
    are used only for compiling INN and aren't useful for users of INN's
    libraries (such as clibrary.h).  All of the installed headers will live
    in include/inn and be installed in a subdirectory named inn in the
    configured include directory.  This conversion is still in progress.

    When writing header files, remember that C reserves all identifiers
    beginning with two underscores and all identifiers beginning with an
    underscore and a capital letter for the use of the implementation; don't
    use any identifiers with names like that.  Additionally, any identifier
    beginning with an underscore and a lower-case letter is reserved in file
    scope, which means that such identifiers can only be used by INN for the
    name of structure members or function arguments in function prototypes.

    Try to pay attention to the impact of a header file on the program
    namespace, particularly for installed header files in include/inn.  All
    symbols defined by a header file should ideally begin with INN_, inn_,
    or some other unique prefix indicating the subsystem that symbol is part
    of, to avoid accidental conflicts with symbols defined by the program
    that uses that header file.

Coding Style

    INN has quite a variety of coding styles intermixed.  As with all
    programs, it's preferrable when making minor modifications to keep the
    coding style of the code you're modifying.  In INN, that will vary by
    file.  (Over time we're trying to standardize on one coding style, so
    changing the region you worked on to fit the general coding style is
    also acceptable).

    If you're writing a substantial new piece of code, the prevailing
    "standard" INN coding style appears to be something like the following:

    *  Write in regular ANSI C whenever possible.  Use the normal ANSI and
       POSIX constructs and use autoconf or portability wrappers to fix
       things up beforehand so that the code itself can read like regular
       ANSI or POSIX code.  Code should be written so that it works as
       expected on a modern platform and is fixed up with portability tricks
       for older platforms, not the other way around.  You may assume an
       ANSI C compiler.

       Try to use const wherever appropriate.  Don't use register; modern
       compilers will do as good of a job as you will in choosing what to
       put into a register.  Don't bother with restrict (at least yet).

    *  Use string handling functions that take counts for the size of the
       buffer whenever possible.  This means using snprintf in preference to
       sprintf and using strlcpy and strlcat in preference to strcpy and
       strcat.  Also, use strlcpy and strlcat instead of strncpy and strncat
       unless the behavior of the latter is specifically required, as it is
       much easier to audit uses of the former than the latter.  (strlcpy is
       like strncpy except that it always nul-terminates and doesn't fill
       the rest of the buffer with nuls, making it more efficient.  strlcat
       is like strncat except that it always nul-terminates and it takes the
       total size of the buffer as its third argument rather than just the
       amount of space left.)  All of these functions are guaranteed to be
       available; there are replacements in lib for systems that don't have
       them.

    *  Avoid #ifdef and friends whenever possible.  Particularly avoid using
       them in the middle of code blocks.  Try to hide all portability
       preprocessor magic in header files or in portability code in lib. 
       When something just has to be done two completely different ways
       depending on the platform or compile options or the like, try to
       abstract that functionality out into a generic function and provide
       two separate implementations using #ifdef; then the main code can
       just call that function.

       If you do have to use preprocessor defines, note that if you always
       define them to either 0 or 1 (never use #define without a second
       argument), you can use the preprocessor define in a regular if
       statement rather than using #if or #ifdef.  Make use of this instead
       of #ifdef when possible, since that way the compiler will still
       syntax-check the other branch for you and it makes it far easier to
       convert the code to use a run-time check if necessary. 
       (Unfortunately, this trick can't be used if one branch may call
       functions unavailable on a particular platform.)

    *  Avoid uses of fixed-width buffers except in performance-critical
       code, as it's harder to be sure that such code is correct and it
       tends to be less flexible later on.  If you need a reusable,
       resizable memory buffer, one is provided in lib/buffer.c.

    *  Avoid uses of static variables whenever possible, particularly in
       libraries, because it interferes with making the code re-entrant down
       the road and makes it harder to follow what's going on.  Similarly,
       avoid using global variables whenever possible, and if they are
       required, try to wrap them into structures that could later be
       changed into arguments to the affected functions.

    *  Roughly BSD style but with four-space indents.  This means no space
       before the parens around function arguments, open brace on the same
       line as if/while/for, and close and open brace on the same line as
       else).

    *  Introductory comments for functions or files are generally written
       as:

           /*
           **  Introductory comment.
           */

       Other multiline comments in the source are generally written as:

           /* This is a
              multiline comment. */

       Comments before functions saying what they do are nice to have.  In
       general, the RCS/CVS Id tag is on the first line of each source file
       since it's useful to know when a file was last modified.

    *  Checks for NULL pointers are preferrably written out explicitly; in
       other words, use:

           if (p != NULL)

       rather than:

           if (p)

       to make it clearer what the code is assuming.

    *  It's better to always put the body of an if statement on a separate
       line, even if it's only a single line.  In other words, write:

           if (p != NULL)
               return p;

       and not:

           if (p != NULL) return p;

       This is in part for a practical reason:  some code coverage analysis
       tools like purecov will count the second example above as a single
       line and won't notice if the condition always evaluates the same way.

    *  Plain structs make perfectly reasonable abstract data types; it's not
       necessary to typedef the struct to something else.  Structs are
       actually very useful for opaque data structures, since you can
       predeclare them and then manipulate pointers to them without ever
       having to know what the contents look like.  Please try to avoid
       typedefs except for function pointers or other extremely confusing
       data types, or for data types where we really gain some significant
       data abstraction from hiding the underlying data type.  Also avoid
       using the _t suffix for any type; all types ending in _t are reserved
       by POSIX.  For typedefs of function pointer types, a suffix of _func
       usually works.

       This style point is currently widely violated inside of INN itself;
       INN originally made extensive use of typedefs.

    *  When noting something that should be improved later, add a comment
       containing "FIXME:" so that one can easily grep for such comments.

    INN's indentation style roughly corresponds to that produced by GNU
    indent 2.2.6 with the following options:

        -bad -bap -nsob -fca -lc78 -cd41 -cp1 -br -ce -cdw -cli0 -ss -npcs
        -ncs -di1 -nbc -psl -brs -i4 -ci4 -lp -ts8 -nut -ip5 -lps -l78 -bbo
        -hnl

    Unfortunately, indent currently doesn't get everything right (it has
    problems with spacing around struct pointer arguments in functions,
    wants to put in a space between a dereference of a function pointer and
    the arguments to the called function, misidentifies some macro calls as
    being type declarations, and fouls up long but simple case statements). 
    It would be excellent if someday we could just run all of INN's code
    through indent routinely to enforce a consistant coding style, but
    indent isn't quite ready for that.

    For users of emacs cc-mode, use the "bsd" style but with:

        (setq c-basic-offset 4)

    Finally, if possible, please don't use tabs in source files, since they
    can expand differently in different environments.  In particular, please
    try not to use the mix of tabs and spaces that is the default in emacs. 
    If you use emacs to edit INN code, you may want to put:

        ; Use only spaces when indenting or centering, no tabs.
        (setq-default indent-tabs-mode nil)

    in your ~/.emacs file.

    Note that this is only a rough guideline and the maintainers aren't
    style nazis; we're more interested in your code contribution than in how
    you write it.

Using CVSup

    If you want to get updated INN source more easily or more quickly than
    by downloading nightly snapshots, or if you want to see the full CVS
    history, you may want to use CVSup to download the source.  CVSup is a
    client and server designed for replicating CVS repositories between
    sites.

    Unfortunately, CVSup is written in Modula-3, so getting a working binary
    can be somewhat difficult.  Binaries are available in the *BSD ports
    collection or (for a wide variety of different platforms) available from
    <ftp://ftp.freebsd.org/pub/FreeBSD/CVSup/binaries/> and its mirrors. 
    Alternately, you can get a compiler from <http://m3.polymtl.ca/m3/>
    (this is more actively maintained than the DEC Modula-3 compiler) and
    the source from <ftp://ftp.freebsd.org/pub/FreeBSD/CVSup/>.

    After you have the CVSup client, you need to have space to download the
    INN repository and space for CVSup to store its data files.  You also
    need to write a configuration file (a supfile) for CVSup.  The following
    supfile will download the latest versions from the mainline source:

        *default host=inn-cvs.isc.org
        *default base=<data-location>
        *default prefix=<download-location>
        *default release=cvs
        *default tag=.
        *default delete use-rel-suffix
        inn

    where <data-location> should be a directory where CVSup can put its data
    files and <download-location> is where the downloaded source will go (it
    will be put into a subdirectory named inn).  If you want to pull down
    the entire CVS repository instead (warning: this is much larger than
    just the latest versions of the source), delete the "*default tag=."
    line.  The best way to download the CVS repository is to download it
    into a portion of a locally-created CVS repository, so that then you can
    perform standard CVS operations (like cvs log) against the downloaded
    repository.  Creating your own local CVS repository is outside the scope
    of this document.

    Note that only multiplexed mode is supported (this mode should be the
    default).

    For more general information on using CVSup, see the FreeBSD page on it
    at <http://www.freebsd.org/handbook/mirrors-cvsup.html>.

Making a Release

    This is a checklist that INN maintainers should go through when
    preparing a new release of INN.

    1.  If making a major release, branch the source tree and create a new
        STABLE branch tag.  This branch will be used for minor releases
        based on that major release and can be done a little while before
        the .0 release of that major release.  At the same time as the
        branch is cut, tag the trunk with a STABLE-<version>-branch marker
        tag so that it's easy to refer to the trunk at the time of the
        branch.

    2.  Update doc/pod/news.pod and regenerate NEWS.  Be more detailed for a
        minor release than for a major release.  For a major release, also
        add information on how to upgrade from the last major release,
        including anything special to be aware of.  (Minor releases
        shouldn't require any special care when upgrading.)

    3.  Make sure that support/config.sub and support/config.guess are the
        latest versions (from <ftp://ftp.gnu.org/gnu/config/>).  See the
        instructions in "Configuring and Portability" for details on how to
        update these files.

    4.  Make sure that samples/control.ctl is in sync with the master
        version at <ftp://ftp.isc.org/pub/usenet/CONFIG/control.ctl>.

    5.  Check out a copy of the release branch.  It's currently necessary to
        run configure to generate Makefile.global.  Then run "make
        check-manifest".  The only differences should be files that are
        generated by configure; if there are any other differences, fix the
        MANIFEST.

    6.  Run "make release".  Note that you need to have a copy of svn2cl
        from <http://ch.tudelft.nl/~arthur/svn2cl/> to do this; at least
        version 0.7 is required.  Start the ChangeLog at the time of the
        previous release.  (Eventually, the script will be smart enough to
        do this for you.)

    7.  Make the resulting tar file available for testing in a non-listable
        directory on ftp.isc.org and announce its availability on
        inn-workers.  Install it on at least one system and make sure that
        system runs fine for at least a few days.  This is also a good time
        to send out a draft of the release announcement to inn-workers for
        proof-reading.

    8.  Generate a diff between this release and the previous release if
        feasible (always for minor releases, possibly not a good idea due to
        the length of the diff for major releases).

    9.  Move the release into the public area of the ftp site and update the
        inn.tar.gz link.  Make an MD5 checksum of the release tarball and
        put it on the ftp site as well, and update the inn.tar.gz.md5 link. 
        Put the diff up on the ftp site as well.  Contact the ISC folks to
        get the release PGP-signed.  Possibly move older releases off into
        the OLD directory.

    10. Announce the new release on inn-announce and in news.software.nntp.

    11. Tag the checked-out tree that was used for generating the release
        with a release tag (INN-<version>).

    12. Bump the revision number in Makefile.global.in.

References

    Some additional references that may be hard to find and may be of use to
    people working on INN:

    <http://www.eyrie.org/~eagle/nntp/>
        The home page for the IETF NNTP standardization effort, including
        links to the IETF NNTP working group archives and copies of the
        latest drafts of the new NNTP standard.  The old archived mailing
        list traffic contains a lot of interesting discussion of why NNTP is
        the way it is.

    <http://www.imc.org/ietf-usefor/>
        The archives for the USEFOR IETF working group, the working group
        for the RFC 1036 replacement (the format of Usenet articles).  Also
        contains a lot of references to other relevant work, such as the RFC
        822 replacement work.

    <http://www.mibsoftware.com/userkt/inn/dev/>
        Forrest Cavalier provides several tools for following INN
        development at this page and elsewhere in the Usenet RKT.  Under
        here is a web-accessible checked-out copy of the current INN source
        tree and pointers to how to use CVSup.

    <http://www.sas.com/standards/large.file/>
        The standards for large file support on Unix that are being
        generally implemented by vendors.  INN sort of partially uses these,
        but a good full audit of the code to check them should really be
        done and there are occasional problems.

    <http://v6web.litech.org/ipv6primer/>
        A primer on IPv6 with pointers to the appropriate places for more
        technical details as needed, useful when working on IPv6 support in
        INN.