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This fixes a number of segfault happening in case config tags are
empty. This patch also adds warnings for most cases.

Please test for any regressions.
This should likely be ported to 2.4.4 as well.

Closes: #2265

As proposed in #2272, this renames the mount specific
mp3-metadata-interval to icy-metadata-interval to prevent
confusion about what it does (setting the icy metadata
interval) and to make clear it's not mp3 specific but ICY
specific.

This fixes the issue that auth for STATS method always fails, by
adding stats method to legacy admin auth in cfgfile.c

This moved the <mime-types> setting into <paths>. The code still
supports reading it from the root element but will warn the user
about this.

Also there seems to be no documentation about this setting.

Closes: #2164

This is a first commit to correct minor problmes reported by
Denis Denisov. There is likely another commit to correct some more
such problems.

Thank you Denis Denisov.

The parent element for <event> was renamed from <kartoffelsalat>
to <event-bindings> as discussed on the mailinglist and on IRC.

This adds a <max-history> config option to the <mount> section.
Default is a history size of 4.

See: #766

This adds the operation mode "strict". It does not yet have
any specific features and alias the "normal" mode.
This change is mostly to make the setting of "strict" valid
so it can be used already.

As we do not support any SSL version but TLS this renames
all TLS related config options. Docs still need to be updated.
Close still uses 'ssl' internally e.g. for variable names.
This should be changed on a later patch.

 * Reworded many log messages for better understanding.
 * Adjusted some version targets as we won't have a 2.4.2 release.
 * Added some FIXME comments

This commit cleanups codestyle a bit, yet there is still some work to be done

This allows <resource> (former <alias>) to have only one of the
attribues source and destination. In that case other parameters
will be applied to the client but uri is not mapped.

See #2097

Add '?omode=legacy' to any URI or <resource ... omode="legacy" />.
Please test.
closes #2097

Old-style <authentication> within <mount> didn't work for type="url"
as well as some other parameters due to confusion between "node"
and "child" variable.

Thanks for trilliot for pointing out! Should work now.
closes #2039

<event> has been added and can be used within <kartoffelsalat>
both in <icecast> and <mount>.
<event> takes backend depending <option> child tags.
Currently supported backends:
 - log: send message to error log.
 - exec: executes a program or script.
 - url: delivers the event via HTTP.

within <mount> <on-connect> and <on-disconnect> has been replaced by
<event>. Config parser can on-the-fly convert old tags.
Also <authentication type="url"> within <mount> has been fixed
for those cases with <option name="mount_add" .../> and
<option name="mount_remove" .../> which are now on-the-fly converted
by the parser to corresponding <event> tags.

Please also see TAGs added as per #2098. Some include hints for
documentation updates needed after this change. Those updates
should take place before 2.4.2.

Renamed event_config_read() into config_reread_config() and moved
it into cfgfile.c. This allowed to delete event.[ch].
event.[ch] will later be used to implement <event>.

renamed <alias> to <resource> as it is planned to extent the usage
of this tag. docs and default configs should be updated by those
taking core of them.

Added .gitignore and submodules
Changed paths to match new location of things

svn path=/icecast/trunk/icecast/; revision=19376

This patch *replaces* the authentication system completly.

What is new:
 - <authentication> in mount section is now a container object.
 - <authentication> in root and mount section may hold any number of <role>-Tags.
 - <role> tags:
   Those tags define a 'role' and it's ACL rules.
   A role is a instance of an authentication module (see below).
   <role> takes the following options. All but type are optional.
   - authentication related:
     - type: Type of the authentication module (values: anonymous, static, legacy-password, url or htpasswd;
             symbolic constants in auth.h)
     - name: Name for the role. For later matching. (values: any string; default: (none))
     - method: This rule is only active on the given list of HTTP methods.
               (list of enum values: methods as recognized by httpp/ (e.g: get,post); default: *)
   - ACL related:
     - allow-method: Allowed HTTP methods.
       (list of enum values: methods as recognized by httpp/ (e.g: get,post); default: get)
     - deny-method: Rejected HTTP methods.
       (list of enum values: methods as recognized by httpp/ (e.g: get,post); default: *)
     - allow-admin: Allowed admin commands. (list of enum values: admin command; default: buildm3u)
     - deny-admin: Rejected admin commands. (list of enum values: admin command; default: *)
     - allow-web: Allowed web pages. (values: empty or *; default: *)
     - deny-web: Rejected web pages. (values: empty or *; default: (empty))
     - connections-per-user: maximum number of simultaneous connections per role and username.
       This is only active on active sources.  (values: unlimited or number of connections; default: unlimited)
     - connection-duration: maximum time of a connection. This is only active on active sources.
       (values: unlimited or number of secounds; default: unlimited)
   <role> takes <option> child tags. <option> tags contain a name and a value option.
   Meaning of <option> tags is up to the authentication module.
 - <role>s are considered to build a stack. If a role returns with AUTH_NOMATCH the next one will be tried.
 - <role>s are tested in this order: mount specific, default mount specific, global, internal fallback.
   Internal fallback is set to allow web/ access via GET, POST and HEAD (only GET supported by this time)
   and rejects all other requests.
 - New authentication module: anonymous
   This module matches all requests. No options taken.
 - New authentication module: static
   This module matches with a static username and password.
   It takes two <option>s. One with name="username" and one with name="password" to set username and password.
   This replaces old style <*-username> and <*-password> tags.
 - New authentication module: legacy-password
   This module matches with a statich password.
   It takes one <option> with name="password" to set password.
   This replaces old ICE and ICY (shoutcast compat mode) authentication.
 - Parsing <authentication> in <mount> with a type set in a special way to allow 100% backward compatibility.
 - Parsing of <source-password>, <admin-password>, <admin-user>, <relay-password> and <relay-user> in global
   <authentication> for 100% backward compatibility.
 - <alias> is now proccessed very early. This enables them to be used for all kinds of requests.

To Do List & What does not yet work:
 - type="url" auth: mount_add and mount_remove.
   This should be replaced by an unique feature I would call '<event>'.
 - Admin commands manageauth and manageauth.xsl are disabled as they need more review:
   This code needs to be ported to support multiple <role>s per <mount>.
 - url authentication module can not yet return AUTH_NOMATCH.
   This needs to be reviewed and discussed on how to handle this case best way.
 - Default config files needs to be updated to reflect the changes.
   As this is quite some political act it should be done in dicussion with the whole team
   and permission of the release manager.
 - Docs need to be updated to reflect the changes.

How does it work:
 Code has been changed so that authentification is done early for all clients.
 This allows accessing the ACL data (client->acl) from nearly everywhere in the code.

 After accept() and initial client setup the request is parsed. In the next step
 all <alias>es are resolved. After this the client is passed for authentication.
 After authentication it is passed to the corresponding subsystem depending on kind of request.

 All authentication instances have a thread running for doing the authentication.
 This thread works on a queue of clients.

Hints for testers:
 - Test with default config.
 - Test with diffrent authentication modules in <mount>.
 - Test shoutcast compatibility mode.
 - Test with new style <authentication> and any amount of <role> (zero to quite some).
 - Test <alias> lookup on all kinds of objects.
 - Test source level credential login into the admin interface.
 - Test shoucast style meta data updates.
 - Test playlist generation.

Thank you for reading this long commit message. Have fun reading the full patch!

svn path=/icecast/trunk/icecast/; revision=19358

svn path=/icecast/trunk/icecast/; revision=19345

svn path=/icecast/trunk/icecast/; revision=19342

(sync with my branch) Updated handling of <on-connect> and <on-disconnect> in <mount>, see r19305:r19312, refs #1354, #2089, #2087, #1752

svn path=/icecast/trunk/icecast/; revision=19340

(sync with my branch) report system name and print better warnings about <hostname> at start of process

svn path=/icecast/trunk/icecast/; revision=19339

(sync with my branch) remove threadpool_size in global config, added warnings for <threadpool> and <no-yp> as well as updated warning for <source-password>

svn path=/icecast/trunk/icecast/; revision=19338

svn path=/icecast/trunk/icecast/; revision=19336