Merge pull request #29 in FS/freeswitch from ~ITALOROSSI/freeswitch:bugfix/FS-5522-add-switchname-xml-json-cdr to master

* commit 'd55505ce':
  Adding switchname to xml_cdr and json_cdr

Modern static analyzers warn when a variable is set but not used.  GCC
warns when the result of a function marked as
`__attribute__((warn_unused_result))` is not set to some variable,
even when the function is cast to `(void)`, which is the recognized
way of indicating the intent to ignore the result.  We treat all
warnings as errors.

The combination of behaviors here makes it difficult if we really
don't care about the result of the function; the obvious workarounds
are precluded.

GCC's maintainers don't consider this to be a bug:

  Why do you think this is a bug?  warn_unused_result is for cases where
  "not checking the result is either a security problem or always a
  bug".

  https://gcc.gnu.org/bugzilla/show_bug.cgi?id=25509#c1

GLIBC however marks functions like `read` and `write` with this
attribute.  While it certainly in most cases is correct to act on
their return value, in some cases we really just don't care.

So when we see that we're building with GCC, and that we're building
with all warnings enabled, we'll just pass -Wno-unused-result to
disable the warning.

ref: https://gcc.gnu.org/bugzilla/show_bug.cgi?id=25509
ref: https://gcc.gnu.org/onlinedocs/gcc/Warning-Options.html

Clang's static analyzer thinks we could be using `hosts` here when it
is NULL.  We probably weren't, but it's easy to see how it could think
so.  We were checking whether `from_addr` matched `ice->addr` three
times, and between the second on third time we might have modified the
`ice->addr`; however we only get there if it matched the second time,
so we could only make it not match at that point and avoid the third
branch.  We can't make it match where it did not before.

We'll simplify the logic a bit here so static analyzers (and humans)
can hopefully see this more readily.

When zero was passed for the size to `sub_alloc`, we were passing this
size on to `malloc` or `calloc`, which is unusual enough that static
analyzers warn about this (POSIX says that either NULL or a pointer
will be returned).

We'll instead just return NULL right away.

When the number of channels was zero, we were calling malloc with a
size of zero.  While defined, this is unusual.  And since we're
initializing the speex resampler as though there were one channel in
this case, we should probably just allocate the space for it.

Clang's static analyzer noticed the result of realloc was being
assigned to a pointer of a different type than was used to calculate
the new size.  We can make things simpler and more idiomatic here by
using the correct pointer type and letting C's pointer arithmetic
automatically handle some multiplication.

We also use the distributive property here to simplify the calculation
for memset.

The `switch_split_date` and `switch_split_time` functions only set as
many variables as they believe exist values in the input string.
Since we didn't have defaults assigned we would read undefined stack
memory if the input string didn't contain e.g. an hour.

With this commit, we use 1970 if no year is present, January if no
month is present, the first day of the month if none is given, and
zero for each of a missing hour, minute, or second.

We're moving the variable declarations down to the smallest possible
scope (a good idea in general) so we can address the use of undefined
memory by the function in a later commit.

mod_curl currently does not verify the authenticity of the peer's
certificate, and does not verify whether the common name on the
certificate matches the server.  This makes mod_curl initiated TLS
connections completely insecure.  We should fix this, but until we do,
we'll warn people that it's not doing what they may think it is.

ref: http://curl.haxx.se/libcurl/c/CURLOPT_SSL_VERIFYPEER.html
ref: http://curl.haxx.se/libcurl/c/CURLOPT_SSL_VERIFYHOST.html

* commit 'c736cf2f':
  Add sofia gateway parameter "destination-prefix"
  FS-5497 add sofia gateway parameter destination-prefix in case you need to send Invites with prefix only to this gateway

mod_graylog2: channel variables can now be automatically added as gelf additional fields in logs w/ session UUID

`curl_sendfile` generates a multipart message with Content-Type:
multipart/form-data with no separate Content-Type headers in the parts
for each non-file argument.  These parts therefore default to
text/plain.  However, prior to this commit, we were putting the URL
encoded POST data into these parts, which is not correct.  We should
be putting raw text into the parts.

With this commit, we urldecode each argument key and value before
composing the multipart message.

See:

  http://www.w3.org/TR/html401/interact/forms.html#h-17.13.4.2

FS-5497 add sofia gateway parameter destination-prefix in case you need to send Invites to your provider with prefix only to this gateway