1 files changed, 64 insertions, 0 deletions
diff --git a/etc/config/config.isp b/etc/config/config.isp
new file mode 100644
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+++ b/etc/config/config.isp
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+-- SPDX-License-Identifier: CC0-1.0
+-- vim:syntax=lua:set ts=4 sw=4:
+-- Config file example usable for ISP resolver
+-- Refer to manual: https://knot-resolver.readthedocs.io/en/stable/
+
+-- Network interface configuration
+net.listen('127.0.0.1', 53, { kind = 'dns' })
+net.listen('::1', 53, { kind = 'dns'})
+net.listen('127.0.0.1', 853, { kind = 'tls' })
+net.listen('::1', 853, { kind = 'tls' })
+net.listen('127.0.0.1', 443, { kind = 'doh2' })
+net.listen('::1', 443, { kind = 'doh2' })
+
+-- Refer to manual for optimal cache size
+cache.size = 4 * GB
+
+-- load modules
+modules = {
+    'view',
+    'stats'
+}
+
+local ffi = require('ffi')
+
+-- log statistics every second
+local stat_id = event.recurrent(1 * second, function(evid)
+    log_info(ffi.C.LOG_GRP_STATISTICS, table_print(stats.list()))
+end)
+
+-- stop printing statistics after first minute
+event.after(1 * minute, function(evid)
+        event.cancel(stat_id)
+end)
+
+-- speed_monitor definition
+-- prints warning if more than 5% of total answers was slow
+function speed_monitor()
+        local previous = stats.list()   -- store statistics in persistent variable
+        return function(evid)
+                local now = stats.list()    -- save actual statistics to variable
+                -- number of total answers between 'now' and 'previous' states
+                local total_increment = now['answer.total'] - previous['answer.total']
+                -- number of slow answers between 'now' and 'previous' states
+                local slow_increment = now['answer.slow'] - previous['answer.slow']
+                -- if percentage of slow answers is bigger than 5%, print warning
+                if slow_increment / total_increment > 0.05 then
+                        log_warn(ffi.C.LOG_GRP_STATISTICS, 'WARNING! More than 5 %% of queries was slow!')
+                end
+                previous = now
+         end
+end
+
+-- execute speed_monitor every minute
+local monitor_id = event.recurrent(1 * minute, speed_monitor())
+
+-- apply RPZ for all clients, default rule is DENY
+policy.add(policy.rpz(policy.DENY, 'blacklist.rpz'))
+
+-- whitelist queries identified by subnet
+view:addr(''192.168.1.0/24'', policy.all(policy.PASS))
+
+-- drop everything that hasn't matched
+view:addr('0.0.0.0/0', policy.all(policy.DROP))
+