[OpenSIPS-Devel] [OpenSIPS/opensips] c01a8d: dialog: support $DLG_dir in onreply_route via From...

[Norm Brandinger]

  Branch: refs/heads/master
  Home:   https://github.com/OpenSIPS/opensips
  Commit: c01a8d71051147c43c6509a29e99f573b7ca98cc
      https://github.com/OpenSIPS/opensips/commit/c01a8d71051147c43c6509a29e99f573b7ca98cc
  Author: Norm Brandinger <n.brandinger at gmail.com>
  Date:   2026-04-21 (Tue, 21 Apr 2026)

  Changed paths:
    M modules/dialog/dialog.c

  Log Message:
  -----------
  dialog: support $DLG_dir in onreply_route via From-tag matching (#3817)

When $DLG_dir is used in onreply_route, get_dlg_direction() returns
DLG_DIR_NONE because ctx_lastdstleg is uninitialized in the reply
processing context (it is only set after onreply_route completes,
in the TMCB_RESPONSE_FWDED callback).

Fall back to matching the reply's From-tag against the dialog's leg
tags to determine direction:
  - From-tag matches caller leg  → upstream  (reply to caller)
  - From-tag matches callee leg  → downstream (reply to callee)

All pointer dereferences are guarded against NULL to prevent any
possibility of segfault on malformed or incomplete state.

Fixes: https://github.com/OpenSIPS/opensips/issues/2132



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