Hello,
On 10/06/05 12:29, Joachim Fabini wrote:
Hi,
A newbie question:
Is there a way for OpenSER to use SIP headers (other than the URI
set) that have been modified/processed by an external command
(exec_dst, exec_msg)?
Reading the documentation and mailing list archives revealed some
questions similar to mine but no answer.
The problem is: Delegate the change of one or more SIP message
headers (or the whole SIP message) to an external application via
exec module.
Two straight-forward solutions:
1. exec_rmsg() - for "replace message". A merge of the functionality
of exec_dst() and exec_msg(), i.e. OpenSER uses the output of
exec_rmsg(command) to replace the current SIP message. This is
imho an extremly flexible solution but slightly difficult to
implement as it requires at least parsing the command's output
- similar to a message received by OpenSER.
2. The command executed by exec_msg() can modify the environment
variables SIP_HF_<hf_name> and OpenSER reuses these values after
the exec() returned control to SER.
Setvars could be used to switch between the current, read-only
meaning of env-variables (e.g., modparam("exec", "setvars", 1))
and a read-write behavior (e.g. modparam("exec", "setvars", 2).
This solution does not require any special handling except that
OpenSER must read back the content of all environment variables
which were passed to the command. Probably quite easy to implement
but has the drawback that no new header fields can be added.
Imho no major limitation as users can add their (dummy) header
fields prior to invoking the command via exec()
Or is there any other existing/planned procedure for SER to use the
output of external commands for rewriting an existing SIP message.
Other possibilities would be to pass the data through database (write in
a table and from there load via avpops) or via fifo interface (write
data to fifo file, then store it in share memory and afterwards reuse it
from there -- this requires development).
Daniel
tia
best regards
--Joachim
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