Change in libosmocore[master]: add identifier sanitation for setting FSM instance ids

[Neels Hofmeyr]

Hello Harald Welte, Jenkins Builder, 

I'd like you to reexamine a change. Please visit

    https://gerrit.osmocom.org/13574

to look at the new patch set (#2).

Change subject: add identifier sanitation for setting FSM instance ids
......................................................................

add identifier sanitation for setting FSM instance ids

We often compose FSM instance IDs from context information, for example placing
an MSISDN string or IP:port information in the FSM instance id, using
osmo_fsm_inst_update_id_f(). This fails if any characters are contained that
don't pass osmo_identifier_valid(). Hence it is the task of the caller to make
sure only characters allowed in an FSM id are applied.

Provide API to trivially allow this by replacing illegal chars:
- osmo_identifier_sanitize_buf(), with access to the same set of illegal
  characters defined in utils.c,
- osmo_fsm_inst_update_id_f_sanitize() implicitly replaces non-identifier
  chars.

This makes it easy to add strings like '192.168.0.1:2342' or '+4987654321' to
an FSM instance id, without adding string mangling to each place that sets an
id; e.g. replacing with '-' to yield '192-168-0-1:2342' or '-4987654321'.

Change-Id: Ia40a6f3b2243c95fe428a080b938e11d8ab771a7
---
M include/osmocom/core/fsm.h
M include/osmocom/core/utils.h
M src/fsm.c
M src/utils.c
4 files changed, 53 insertions(+), 2 deletions(-)


  git pull ssh://gerrit.osmocom.org:29418/libosmocore refs/changes/74/13574/2
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Gerrit-Project: libosmocore
Gerrit-Branch: master
Gerrit-MessageType: newpatchset
Gerrit-Change-Id: Ia40a6f3b2243c95fe428a080b938e11d8ab771a7
Gerrit-Change-Number: 13574
Gerrit-PatchSet: 2
Gerrit-Owner: Neels Hofmeyr <nhofmeyr at sysmocom.de>
Gerrit-Reviewer: Harald Welte <laforge at gnumonks.org>
Gerrit-Reviewer: Jenkins Builder (1000002)
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