Change in osmo-msc[master]: GSUP: include terminating nul in inter-MSC source/destination name

Neels Hofmeyr gerrit-no-reply at
Tue May 7 23:42:36 UTC 2019

Hello Harald Welte, Jenkins Builder, 

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

to look at the new patch set (#4).

Change subject: GSUP: include terminating nul in inter-MSC source/destination name

GSUP: include terminating nul in inter-MSC source/destination name

Before, I was testing with osmo-hlr patch
I01a45900e14d41bcd338f50ad85d9fabf2c61405 applied, but that patch is currently
in an abandoned state.

This is the counterpart implemented in osmo-msc: always include the terminating
nul char in the "blob" that is the MSC IPA name.

The dualities in the formats of routing between MSCs is whether to handle it as
a char*, or as a uint8_t* with explicit len (a blob).

In the VTY config to indicate target MSCs for inter-MSC handover, we have
strings. We currently even completely lack a way of configuring any blob-like
data as a VTY config item.

In osmo-hlr, the IPA names used for routing are currently received as a char*
which *includes* the terminating nul char. So in osmo-msc, if we also always
include the nul char, it works.

Instead, we could just send the char* part without the nul char, and apply
above mentioned osmo-hlr patch. That patch would magically match a name that
lacks a nul with a name that includes one. I think it is better to agree on one
format on the GSUP wire now, instead of making assumptions in osmo-hlr on the
format of the source/target names for routing. This format, from the way GSUP
so far transmits the IPA SERNO tag when a client attaches to osmo-hlr, happens
to include the terminating nul char.

Change-Id: I9ca8c9eef104519ed1ea46e2fef46dcdc0d554eb
M src/libmsc/e_link.c
1 file changed, 14 insertions(+), 7 deletions(-)

  git pull ssh:// refs/changes/12/13612/4
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Gerrit-Project: osmo-msc
Gerrit-Branch: master
Gerrit-MessageType: newpatchset
Gerrit-Change-Id: I9ca8c9eef104519ed1ea46e2fef46dcdc0d554eb
Gerrit-Change-Number: 13612
Gerrit-PatchSet: 4
Gerrit-Owner: Neels Hofmeyr <nhofmeyr at>
Gerrit-Reviewer: Harald Welte <laforge at>
Gerrit-Reviewer: Jenkins Builder (1000002)
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