Added functions to open, close, and apply XML Stylesheets
to XML documents.  Although the presence of libxslt was already
being checked by configure, it was only happening if xmldoc was
enabled.  Now it's checked regardless.

Added ability to parse a string consisting of comma separated
name/value pairs into an ast_variable list.  The reverse of
ast_variable_list_join().

Change-Id: I1e1d149be22165a1fb8e88e2903a36bba1a6cf2e

Added:

Replace a variable in a list:
int ast_variable_list_replace_variable(struct ast_variable **head,
    struct ast_variable *old, struct ast_variable *new);
Added test as well.

Create a "name=value" string from a variable list:
'name1="val1",name2="val2"', etc.
struct ast_str *ast_variable_list_join(
    const struct ast_variable *head, const char *item_separator,
    const char *name_value_separator, const char *quote_char,
    struct ast_str **str);
Added test as well.

Allow the name of an XML element to be changed.
void ast_xml_set_name(struct ast_xml_node *node, const char *name);

Change-Id: I330a5f63dc0c218e0d8dfc0745948d2812141ccb

The disabledevents setting has been added to the general section
in manager.conf, which allows users to specify events that
should be globally disabled and not sent to any AMI listeners.

This allows for processing of these AMI events to end sooner and,
for frequent AMI events such as Newexten which users may not have
any need for, allows them to not be processed. Additionally, it also
cleans up core debug as previously when debug was 3 or higher,
the debug was constantly spammed by "Analyzing AMI event" messages
along with a complete dump of the event contents (often for Newexten).

ASTERISK-29853 #close

Change-Id: Id42b9a3722a1f460d745cad1ebc47c537fd4f205

Adds the lastcontext and lastexten channel fields to allow users
to access previous dialplan execution locations.

ASTERISK-29840 #close

Change-Id: Ib455fe300cc8e9a127686896ee2d0bd11e900307

Although there are 10 debugs levels, over time,
many current debug calls have come to use
inappropriately low debug levels. In particular,
a select few debug calls (currently all debug 1)
can result in thousands of debug messages per minute
for a single call.

This can adds a lot of noise to core debug
which dilutes the value in having different
debug levels in the first place, as these
log messages are from the core internals are
are better suited for higher debug levels.

Some debugs levels are thus adjusted so that
debug level 1 is not inappropriately overloaded
with these extremely high-volume and general
debug messages.

ASTERISK-29897 #close

Change-Id: I55a71598993552d3d64a401a35ee99474770d4b4

Refactors temp file utility function into file.c.

ASTERISK-29809 #close

Change-Id: Ife478708c8f2b127239cb73c1755ef18c0bf431b

Adds two pieces of information to the core show settings command
which are useful in the context of getting backtraces.

The first is to display whether or not Asterisk would generate
a core dump if it were to crash.

The second is to show the current running directory of Asterisk.

ASTERISK-29866 #close

Change-Id: Ic42c0a9ecc233381aad274d86c62808d1ebb4d83

The configObject tag contains a default attribute which
allows the default value to be specified, if applicable.
This allows for the default value to show up specially on
the wiki in a way that is clear to users.

There are a couple places in the tree where default values
are included in the description as opposed to as attributes,
which means these can't be parsed specially for the wiki.
These are changed to use the attribute instead of being
included in the text description.

ASTERISK-29898 #close

Change-Id: I9d7ea08f50075f41459ea7b76654906b674ec755

When tps_shutdown is called as part of the cleanup process there is a
chance that one of the taskprocessors that references the
tps_singletons object is still running.  The change is to allow for
tps_shutdown to check tps_singleton's container count and give the
running taskprocessors a chance to finish.  If after
AST_TASKPROCESSOR_SHUTDOWN_MAX_WAIT (10) seconds there are still
container references we shutdown anyway as this is most likely a bug
due to a taskprocessor not being unreferenced.

ASTERISK-29365

Change-Id: Ia932fc003d316389b9c4fd15ad6594458c9727f1

This code was needlessly complex and would fail to properly delimit
the response message if LOW_MEMORY was defined.

Change-Id: Iae50bf09ef4bc34f9dc4b49435daa76f8b2c5b6e

The XML Manager Event Interface (amxml) now generates attribute names
that are compliant with the XML 1.1 specification. Previously, an
attribute name that started with a digit would be rendered as-is, even
though attribute names must not begin with a digit. We now prefix
attribute names that start with a digit with an underscore ('_') to
prevent XML validation failures.

This is not backwards compatible but my assumption is that compliant
XML parsers would already have been complaining about this.

ASTERISK-29886 #close

Change-Id: Icfaa56a131a082d803e9b7db5093806d455a0523

Adds a new option, defaultenabled, to the CDR core to
control whether or not CDR is enabled on a newly created
channel. This allows CDR to be disabled by default on
new channels and require the user to explicitly enable
CDR if desired. Existing behavior remains unchanged.

ASTERISK-29808 #close

Change-Id: Ibb78c11974bda229bbb7004b64761980e0b2c6d1

sched: Avoid a double deref when AST_SCHED_DEL_UNREF is called on an
executing call-back. This is done by adding a new variable 'rescheduled'
to the struct sched which is set in ast_sched_runq and checked in
ast_sched_del_nonrunning. ast_sched_del_nonrunning is a replacement for
now deprecated ast_sched_del which returns a new possible value -2
if called on an executing call-back with rescheduled set. ast_sched_del
is modified to call ast_sched_del_nonrunning to maintain existing code.
AST_SCHED_DEL_UNREF is also updated to look for the -2 in which case it
will not throw a warning or invoke refcall.
test_sched: Add a new unit test sched_test_freebird that will check the
reference count in the resolved scenario.

ASTERISK-29698

Change-Id: Icfb16b3acbc29cf5b4cef74183f7531caaefe21d

Enable the Linux rdtsc implementation on NetBSD as well.  The assembly
works correctly there.

ASTERISK-29851

Change-Id: I460ad9b4d971913420ecb84186f5ba5ab03f6f37

Implement the ast_get_tid() function for NetBSD system.  NetBSD supports
getting the TID via _lwp_self().

ASTERISK-29850

Change-Id: If57fd3f9ea15ef5d010bfbdcbbbae9b379f72f8c

A regression was introduced in ASTERISK~29531 that caused 'say'
functions to fail with file lists that would previously have
succeeded. This caused affected channels to hang up where previously
they would have continued.

We now explicitly check for the empty string to restore the previous
behavior.

ASTERISK-29859 #close

Change-Id: Ia2e5769868e2792313c2d7c07996efe009c6f8d5

Every config variable in the directories
section of asterisk.conf currently has a
counterpart built-in variable containing
the value of the config option, except
for the last one, astsbindir, which should
have an ASTSBINDIR variable.

However, the actual corresponding ASTSBINDIR
variable is missing in pbx_variables.c.

This adds the missing variable so that all
the config options have their corresponding
variable.

ASTERISK-29847 #close

Change-Id: I36006faf471825b36ebc8aa5e87a3bcb38d446fc

gethostbyname() and gethostbyname_r() are deprecated in favor of
getaddrinfo() which we use in the ast_sockaddr family of functions.

ASTERISK-29819 #close

Change-Id: Ie277c0ef768d753b169c121ef570a71665692ab7

Adds the macro DTMF_MATRIX_SIZE to replace
the magic number 4 sprinkled throughout
dsp.c.

ASTERISK-29815 #close

Change-Id: Ie3bddb92c6b16204ece0f758009e9490eb33b9ba

Adds an AMI event for a wink frame.

ASTERISK-29830 #close

Change-Id: I83e426de5e37baed79a4dbcc91e9e8d030ef1b56

Adds a command to the CLI to unload and then
load a module. This makes it easier to perform
these operations which are often done
subsequently to load a new version of a module.

"module reload" already refers to reloading of
configuration, so the name "refresh" is chosen
instead.

ASTERISK-29807 #close

Change-Id: I595f6f11774a0de2565a1fba38da22309ce93a2c

Adds missing documentation for some channel,
bridge, and queue events.

ASTERISK-24427
ASTERISK-29515

Change-Id: I92b06b88c8cadc0155f95ebe3e870b3e795a8c64

The current TCP client connect code, blocks and does not handle EINTR
error case.

This patch makes the client socket non-blocking while connecting,
ensures a connect does not immediately fail due to EINTR "errors",
and adds a connect timeout option.

The original client start call sets the new timeout option to
"infinite", thus making sure old, orginal behavior is retained.

ASTERISK-29746 #close

Change-Id: I907571843a83e43c0742b95a64785f4411f02671

Adds tech-agnostic support for SF signaling
by adding SF sender and receiver applications
as well as Dial integration.

ASTERISK-29802 #close

Change-Id: I7ec50752e9a661af639425e5d1e339f17411bcad

SayAlpha, SayAlphaCase, SayDigits, SayMoney, SayNumber, SayOrdinal,
and SayPhonetic all claim to allow DTMF interruption if the
SAY_DTMF_INTERRUPT channel variable is set to a truthy value, but we
are failing to break out of a given 'say' application if DTMF actually
occurs.

ASTERISK-29816 #close

Change-Id: I6a96e0130560831d2cb45164919862b9bcb6287e

It's not safe to keep the channel locked while locking
the peer Local channel, as it can result in a deadlock.

This change unlocks it during this time but keeps the
bridge locked to ensure nothing changes about the bridge.

ASTERISK-29821

Change-Id: Ib68eb7037e5a479bcc2aceee77337cdde1fbdde6

The variable cp4 in a variable substitution function
can potentially be used without being initialized
currently. This causes Asterisk to no longer compile.

This initializes cp4 to NULL to make the compiler
happy.

ASTERISK-29803 #close

Change-Id: I392579cbb76db2795d5820c9427cf55fbcee9e72

Previously, it was only possible to have one HTTP server in Asterisk.
With this patch it is now possible to have multiple HTTP servers
listening on different addresses.

Note, this behavior has only been made available through an API call
from within the TEST_FRAMEWORK. Specifically, this feature has been
added in order to allow unit test to create/start and stop servers,
if one has not been enabled through configuration.

Change-Id: Ic5fb5f11e62c019a1c51310f4667b32a4dae52f5

Currently, Asterisk doesn't throw warnings if options
are passed into applications that don't accept them.
This can confuse users if they're unaware that they
are doing something wrong.

This adds an additional check to parse_options so that
a warning is thrown anytime an option is parsed that
doesn't exist in the parsing application, so that users
are notified of the invalid usage.

ASTERISK-29801 #close

Change-Id: Id029274a57135caca193c913307a63fd75e24679

Currently MSet can only parse a maximum of 24 variables.
If more variables are provided to MSet, the 24th variable
will simply contain the remainder of the string and the
remaining variables thereafter will never get set.

This increases the number of variables that can be parsed
in one go from 24 to 99. Additionally, documentation is added
since this limitation is currently undocumented and is
confusing to users who encounter this limitation.

ASTERISK-29766 #close

Change-Id: I3fe35b462dedec0a452fd9ea7f92c920a3939f16

Currently, variable substitution involving dialplan
extensions is quite clunky since it entails obtaining
the current dialplan location, backing it up, storing
the desired variables for substitution on the channel,
performing substitution, then restoring the original
location.

In addition to being clunky, things could also go wrong
if an async goto were to occur and change the dialplan
location during a substitution.

Fundamentally, there's no reason it needs to be done this
way, so new API is added to allow for directly passing in
the dialplan location for the purposes of variable
substitution so we don't need to mess with the channel
information anymore. Existing API is not changed.

ASTERISK-29745 #close

Change-Id: I23273bf27fa0efb64a606eebf9aa8e2f41a065e4

Adds tech-agnostic support for MF signaling by adding
MF sender and receiver applications as well as Dial
integration.

ASTERISK-29496-mf #do-not-close

Change-Id: I61962b359b8ec4cfd05df877ddf9f5b8f71927a4

Change-Id: I5b5cf9c9cbbe00ba8b379a8d162ac67445d39016

We know that passing a NULL or empty argument to
ast_channel_get_by_name() will never result in a matching channel and
will always result in an error being emitted, so just short-circuit
out in that case.

ASTERISK-28219 #close

Change-Id: I88eadc748e9c6996fc17467b0a05881bbfd00bce

ASTERISK-29763

Change-Id: Ib8359e3590a9109eb04a5376559d040e5e21867e

ASTERISK-29779

Change-Id: If338163488498f65fa7248b60e80299c0a928e4b

Since Doxygen 1.8.16, a special comment block is required. Otherwise
(pure C comment), the group command is ignored. Additionally, several
unbalanced group commands were fixed.

ASTERISK-29732

Change-Id: I4687857b9d56e6f44fd440b73af156691660202e

A backend's implementation of the realtime 'require' function may call
va_arg() and then fail, leaving the va_list in an undefined
state. Pass a copy of the va_list instead.

ASTERISK-29771 #close

Change-Id: I555565a72af84e96d49f62fe8cb66ba5a78461f4

Refactors generic functions used for email generation
into utils.c so that they can be used by multiple
modules, including app_voicemail and app_minivm,
to avoid code duplication.

ASTERISK-29715 #close

Change-Id: I1de0ed3483623e9599711129edc817c45ad237ee

ASTERISK-29765

Change-Id: I654ba0debe8351038d4433716434a09370f04c9d