Implement rate-limits

[welterde]

Due to certain recent ​events, rate-limits are clearly missing from the streaming lib.
Option for limiting concurrent connections would be: i2p.streaming.limit.concurrentStreams

[postman@…]

Proposal for ratelimiting:

Don't look at concurrent connections alone, but make it a real limiter
with a defined limit for connections/minute,hour,day from the same
destination

The values for could be part of the extended configuration options
like:

..... .servertunnelx.useRateLimiter=true
..... .servertunnelx.RateLimits?=1/2/10

if the ratelimit hits the offending client should be held for a random amount
of seconds (up to 15) and then be treated like the service is not active/reachable.
Sorry for not using the right lingo...

postman

[sponge <sponge@…>]

Even better, do this as an I2CP option, so that applications can have access to the feature.

[zzz]

Maybe, maybe not. Is connection rate limiting "clearly" a feature for the streaming lib and not something to be solved at the application level? Depending on how it's done it could be fairly complex and resource-intensive too.

As a crude alternative I've implemented blocking by dest hash. Details at ​http://zzz.i2p/topics/614

One problem with any connection option is you can't change them on-the-fly, so you have to stop and restart the tunnel to take effect. This goes for the blocking option too.

[welterde]

already implemented in 0.7.14