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#### Description <!-- Describe your changes in detail -->

Commits are separated per change dedication, even though they concern the same component. - core: add support of ICE media options to SDP parser - core: improve an existing data structures cloning in the SDP parser

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core: add support of ICE media options to SDP parser

In the current implementation only parsing of ICE candidate attributes is supported, which makes it Possible to work with ICE candidates and parameters specifically related per candidate, but makes it Impossible to work with ICE options of the media stream level (ICE options which have an impact on the whole specific media stream).

ICE candidate attributes and ICE media options have different dedication.

In order to target this matter, a new linked list is introduced to store ICE media stream options.

Additionally, now when parsing media stream's attributes, a couple of new helper functions have been introduced to properly extract and store ICE media options: - extract_ice_option() - add_sdp_ice_opt()

The following extraction approaches are supported: - multi-valued ICE options attribute (more than one value per a= header) - one value per attribute (multiple a= headers with ICE options present)

Also now the way how a "zeroed" on-hold is detected is improved, in case of the ICE (re)negotiation (when the connection address is equal to '0.0.0.0', the media port is equal to '9' and ice-option 'trickle' is present) the SDP is Not considered as an on-hold case, and it clearly detects it's the ICE (re)negotiation (RFC 8840), which for e.g. leads to a proper work of other side modules' functions (which use SDP parser's data structures), such as 'is_audio_on_hold()' from the textops.so module.

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core: improve existing data structures cloning in the SDP parser

It's been noticed that the cloning of SDP session(s) and SDP stream(s) structures doesn't allocate the ICE candidate attributes, nor it allocates (recently introduced) ICE media stream options.

In order to target this a couple of new functions have been introduced: - clone_sdp_opt_attr() - clone_sdp_ice_attr()

And additionally the following functions have been improved, in order to properly clone/free ICE candidate attributes and (recently introduced) ICE media stream options: - clone_sdp_stream_cell() - free_cloned_sdp_stream() - free_sdp() - print_sdp_stream()

Additionally for a proper new structure length calculation, the following function is fixed: - clone_sdp_session_cell()

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Tagging project members to review the changes: @miconda @henningw @linuxmaniac

You can view, comment on, or merge this pull request online at:

https://github.com/kamailio/kamailio/pull/3034

-- Commit Summary --

* core: add support of ICE media options to SDP parser * core: improve an existing data structures cloning in the SDP parser

-- File Changes --

M src/core/parser/sdp/sdp.c (290) M src/core/parser/sdp/sdp.h (40) M src/core/parser/sdp/sdp_helpr_funcs.c (60) M src/core/parser/sdp/sdp_helpr_funcs.h (1)

-- Patch Links --

https://github.com/kamailio/kamailio/pull/3034.patch https://github.com/kamailio/kamailio/pull/3034.diff