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Probably the developer thought only one of the tables are used in a Kamailio instance, they kind of overlap a lot in purpose and functionality. Personally I use only address table, I don't think I ever initiated a Kamailio deployment using the trusted table.
Anyhow, because this kind of functionality seems to be needed in other places, I added support in core for rate-limiting the execution of RPC commands to specific time interval that can be set via the new core parameter rpc_exec_delta. It is not done automatically for all commands, only for those that are exported with RPC_EXEC_DELTA flag in the C code. For now I updated the exports of RPC reload commands for tls and permissions module.
The core value is checked first, being done when the rpc command is searched to be executed, so if it is lower than per module restriction (like in permissions), it hits first.
The rate limiting is per command, but the time interval value is global, which should be (good) enough for now, imo. If more flexibility would be needed, one more thing that can be added is to make rpc_exec_delta updatable via rpc as well.
The new functionality is available only in devel version, it is not a candidate to be backported because it touches many places.
Testing and feedback is appreciated. I think this issue can be closed if no other comments/proposals come in soon.
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