<!-- Kamailio Pull Request Template -->

<!-- IMPORTANT: - for detailed contributing guidelines, read: https://github.com/kamailio/kamailio/blob/master/.github/CONTRIBUTING.md - pull requests must be done to master branch, unless they are backports of fixes from master branch to a stable branch - backports to stable branches must be done with 'git cherry-pick -x ...' - code is contributed under BSD for core and main components (tm, sl, auth, tls) - code is contributed GPLv2 or a compatible license for the other components - GPL code is contributed with OpenSSL licensing exception -->

#### Pre-Submission Checklist <!-- Go over all points below, and after creating the PR, tick all the checkboxes that apply --> <!-- All points should be verified, otherwise, read the CONTRIBUTING guidelines from above--> <!-- If you're unsure about any of these, don't hesitate to ask on sr-dev mailing list --> - [ ] Commit message has the format required by CONTRIBUTING guide - [ ] Commits are split per component (core, individual modules, libs, utils, ...) - [ ] Each component has a single commit (if not, squash them into one commit) - [ ] No commits to README files for modules (changes must be done to docbook files in `doc/` subfolder, the README file is autogenerated)

#### Type Of Change - [ ] Small bug fix (non-breaking change which fixes an issue) - [ ] New feature (non-breaking change which adds new functionality) - [ ] Breaking change (fix or feature that would change existing functionality)

#### Checklist: <!-- Go over all points below, and after creating the PR, tick the checkboxes that apply --> - [x] PR should be backported to stable branches - [x] Tested changes locally - [ ] Related to issue #XXXX (replace XXXX with an open issue number)

#### Description <!-- Describe your changes in detail --> Diameter request MAR and corresponding response MAA both contain authentication vectors in binary form. Ims_diameter_server lacks functionality to convert binary arrays to json and back. This pr is a couple of minor fixes to rectify the issue: * when converting Diameter binary vector to json use %02x in sprintf() to form a proper hexdump which is possible to decode on json side. The hexdump is sent in "data" key value pair as string. * introduce new key value pair "hexdump" in json which will contain hex dump of binary vector formed on json side. ims_diameter_server converts it to Diameter AVP using hex dump to binary transcoding.

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

https://github.com/kamailio/kamailio/pull/1528

-- Commit Summary --

* use hexdump type of string to send binary data in json * duplicate before giving it to cdp * converting binary data to hex dump requires fixed width lenght in snprintf

-- File Changes --

M src/modules/ims_diameter_server/avp_helper.c (50)

-- Patch Links --

https://github.com/kamailio/kamailio/pull/1528.patch https://github.com/kamailio/kamailio/pull/1528.diff