Pre-Submission Checklist

• 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

• New feature (non-breaking change which adds new functionality)

Checklist:

• PR should be backported to stable branches
• Tested changes locally
• Related to issue #2967

Description

Add new preprocessor keywords trydefenv and trydefenvs that work like defenv and defenvs respectively, with the difference that if the environmental variable is not defined, then the value in Kamailio will not be defined.

For example:

#!KAMAILIO

loadmodule "xlog"
loadmodule "pv"

#!trydefenv EXTRALOG

request_route {
    #!ifdef EXTRALOG
       xlog("L_I", "Some Extra Logging here\n");
    #!endif
    forward ();
}

If the environmental variable $EXTRALOG is defined, the log line will be written. If the environmental variable is not set, then in Kamailio EXTRALOG will not be defined and the #!ifdef section will not be loaded.

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

  https://github.com/kamailio/kamailio/pull/2969

Commit Summary

• 488f834 core: cfg.lex support for undefned env vars

File Changes

(2 files)

• M src/core/cfg.lex (56)
• M src/core/ppcfg.h (8)

Patch Links:

• https://github.com/kamailio/kamailio/pull/2969.patch
• https://github.com/kamailio/kamailio/pull/2969.diff

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