[OpenSIPS-Devel] [OpenSIPS/opensips] 6c911c: resolve: fix CNAME chain resolution with caching

[Bogdan Andrei IANCU]

  Branch: refs/heads/master
  Home:   https://github.com/OpenSIPS/opensips
  Commit: 6c911c3105b565b8a77758d11c3d3b22ccc8385c
      https://github.com/OpenSIPS/opensips/commit/6c911c3105b565b8a77758d11c3d3b22ccc8385c
  Author: Jasper Hafkenscheid <jasper.hafkenscheid at voys.nl>
  Date:   2025-10-06 (Mon, 06 Oct 2025)

  Changed paths:
    M resolve.c

  Log Message:
  -----------
  resolve: fix CNAME chain resolution with caching

The DNS resolver now explicitly follows CNAME chains instead of relying
on res_search() to handle them transparently. This fixes resolution
failures when the DNS cache module is enabled, as cached CNAME responses
need to be followed manually to reach the final A/AAAA records.

Changes:
- Add iterative CNAME chain following in own_gethostbyname2()
- Limit chain depth to 10 to prevent infinite loops
- Add debug logging for CNAME traversal


  Commit: 401957bd8ddbf050d9c2f65c8a51021ea78391d7
      https://github.com/OpenSIPS/opensips/commit/401957bd8ddbf050d9c2f65c8a51021ea78391d7
  Author: Bogdan Andrei IANCU <bogdan at opensips.org>
  Date:   2026-01-27 (Tue, 27 Jan 2026)

  Changed paths:
    M resolve.c

  Log Message:
  -----------
  Merge pull request #3733 from hafkensite/feature/dns-cache-cname

resolve: fix CNAME chain resolution with caching #3709


Compare: https://github.com/OpenSIPS/opensips/compare/d48e69c2b2fb...401957bd8ddb

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