[BUG] OpenSIPS 3.6.3: AMQP shortstr length includes trailing NUL (exchange ends with \x00)

[kertorffoto-dot]

OpenSIPS version you are running

3.6.3~20260210~0e56b0ca4-1

Describe the bug

After upgrading a test registrar to OpenSIPS 3.6.3, EVI events published via event_rabbitmq started to fail routing in RabbitMQ. Packet captures show the exchange is encoded as an AMQP shortstr with length +1, causing a trailing NUL byte (\x00) to be included in the value (e.g., events.topic.name\x00). The same configuration on PROD (older OpenSIPS build) publishes without the extra NUL.

I am using code:

subscribe_event("E_REG_STAT", "rabbitmq:user:pass@1.1.1.1:5672/exchange=events.user.reg?");

On 3.3 OpenSIPS pass this in rmq packet - it is correct:

events.user.reg\x00\x00\xce

On 3.6.3 OpenSIPS pass this in rmq packet - it is broken:

events.user.reg\x00\x00\x01\xce

Possible problem is here in "modules/event_rabbitmq/event_rabbitmq.c":

dst->s[dst->len] = 0;
dst->len++;          /* <----- HERE */

To Reproduce

Just use 3.6.3~20260210~0e56b0ca4-1 and example of above 'subscribe_event()'

Expected behavior

On 3.6.3~20260210~0e56b0ca4-1 should work in same way, that it happened on 3.3.

Relevant System Logs

OS/environment information

• Operating System:
• OpenSIPS installation:
• other relevant information:

Additional context