Upgrade geoip library to v2.4.0

.gitignore

@@ -14,6 +14,5 @@ tests/docker_logs
 .nginx-validate.*
 /docs/
 /dev/bootstrap/GeoLite2-ASN/
-/dev/bootstrap/GeoLite2-City/
 /dev/bootstrap/monitoring/
 /scripts/

README.md

@@ -116,8 +116,8 @@ cp api/.env.sample api/.env
 cp proxy/.env.sample proxy/.env
 cp dnscheck/.env.sample dnscheck/.env
 
-# 2. MaxMind GeoLite2 databases (mounted by the proxy and dnscheck)
-#    Place them under dev/bootstrap/GeoLite2-ASN/ and dev/bootstrap/GeoLite2-City/
+# 2. MaxMind GeoLite2-ASN database (mounted by the proxy and dnscheck)
+#    Place GeoLite2-ASN.mmdb under dev/bootstrap/GeoLite2-ASN/
 ```
 
 Then:

api/go.mod

@@ -41,7 +41,6 @@ require (
 	github.com/containerd/log v0.1.0 // indirect
 	github.com/containerd/platforms v0.2.1 // indirect
 	github.com/cpuguy83/dockercfg v0.3.2 // indirect
-	github.com/davecgh/go-spew v1.1.1 // indirect
 	github.com/distribution/reference v0.6.0 // indirect
 	github.com/docker/docker v28.5.1+incompatible // indirect
 	github.com/docker/go-connections v0.6.0 // indirect
@@ -86,7 +85,6 @@ require (
 	github.com/opencontainers/go-digest v1.0.0 // indirect
 	github.com/opencontainers/image-spec v1.1.1 // indirect
 	github.com/philhofer/fwd v1.1.3-0.20240916144458-20a13a1f6b7c // indirect
-	github.com/pmezard/go-difflib v1.0.0 // indirect
 	github.com/power-devops/perfstat v0.0.0-20240221224432-82ca36839d55 // indirect
 	github.com/rivo/uniseg v0.4.7 // indirect
 	github.com/robfig/cron/v3 v3.0.1 // indirect
@@ -106,6 +104,7 @@ require (
 	go.opentelemetry.io/otel/metric v1.41.0 // indirect
 	go.opentelemetry.io/otel/trace v1.41.0 // indirect
 	go.uber.org/atomic v1.11.0 // indirect
+	go.yaml.in/yaml/v3 v3.0.5 // indirect
 	golang.org/x/tools v0.44.0 // indirect
 )
 
@@ -123,7 +122,7 @@ require (
 	github.com/montanaflynn/stats v0.7.1 // indirect
 	github.com/pkg/errors v0.9.1
 	github.com/sqids/sqids-go v0.4.1
-	github.com/stretchr/testify v1.11.1
+	github.com/stretchr/testify v1.12.1
 	github.com/valyala/bytebufferpool v1.0.0 // indirect
 	github.com/valyala/fasthttp v1.57.0
 	github.com/valyala/tcplisten v1.0.0 // indirect
@@ -132,7 +131,7 @@ require (
 	github.com/xdg-go/stringprep v1.0.4 // indirect
 	github.com/youmark/pkcs8 v0.0.0-20240726163527-a2c0da244d78 // indirect
 	golang.org/x/crypto v0.52.0
-	golang.org/x/sync v0.20.0
-	golang.org/x/sys v0.45.0 // indirect
+	golang.org/x/sync v0.22.0
+	golang.org/x/sys v0.47.0 // indirect
 	golang.org/x/text v0.37.0
 )

api/go.sum

@@ -196,7 +196,6 @@ github.com/pingcap/errors v0.11.4 h1:lFuQV/oaUMGcD2tqt+01ROSmJs75VG1ToEOkZIZ4nE4
 github.com/pingcap/errors v0.11.4/go.mod h1:Oi8TUi2kEtXXLMJk9l1cGmz20kV3TaQ0usTwv5KuLY8=
 github.com/pkg/errors v0.9.1 h1:FEBLx1zS214owpjy7qsBeixbURkuhQAwrK5UwLGTwt4=
 github.com/pkg/errors v0.9.1/go.mod h1:bwawxfHBFNV+L2hUp1rHADufV3IMtnDRdf1r5NINEl0=
-github.com/pmezard/go-difflib v1.0.0 h1:4DBwDE0NGyQoBHbLQYPwSUPoCMWR5BEzIk/f1lZbAQM=
 github.com/pmezard/go-difflib v1.0.0/go.mod h1:iKH77koFhYxTK1pcRnkKkqfTogsbg7gZNVY4sRDYZ/4=
 github.com/power-devops/perfstat v0.0.0-20240221224432-82ca36839d55 h1:o4JXh1EVt9k/+g42oCprj/FisM4qX9L3sZB3upGN2ZU=
 github.com/power-devops/perfstat v0.0.0-20240221224432-82ca36839d55/go.mod h1:OmDBASR4679mdNQnz2pUhc2G8CO2JrUAVFDRBDP/hJE=
@@ -235,8 +234,8 @@ github.com/stretchr/testify v1.3.0/go.mod h1:M5WIy9Dh21IEIfnGCwXGc5bZfKNJtfHm1UV
 github.com/stretchr/testify v1.7.1/go.mod h1:6Fq8oRcR53rry900zMqJjRRixrwX3KX962/h/Wwjteg=
 github.com/stretchr/testify v1.8.0/go.mod h1:yNjHg4UonilssWZ8iaSj1OCr/vHnekPRkoO+kdMU+MU=
 github.com/stretchr/testify v1.8.4/go.mod h1:sz/lmYIOXD/1dqDmKjjqLyZ2RngseejIcXlSw2iwfAo=
-github.com/stretchr/testify v1.11.1 h1:7s2iGBzp5EwR7/aIZr8ao5+dra3wiQyKjjFuvgVKu7U=
-github.com/stretchr/testify v1.11.1/go.mod h1:wZwfW3scLgRK+23gO65QZefKpKQRnfz6sD981Nm4B6U=
+github.com/stretchr/testify v1.12.1 h1:EuwCh5fleGS7H32xRwO3wRGT7DxrDhLAT6FF8MpWDWE=
+github.com/stretchr/testify v1.12.1/go.mod h1:MDEgiDPPsNp5cuIrHPPCyornHKgEVbtFUmoNlxoYthg=
 github.com/swaggo/files/v2 v2.0.0 h1:hmAt8Dkynw7Ssz46F6pn8ok6YmGZqHSVLZ+HQM7i0kw=
 github.com/swaggo/files/v2 v2.0.0/go.mod h1:24kk2Y9NYEJ5lHuCra6iVwkMjIekMCaFq/0JQj66kyM=
 github.com/swaggo/swag v1.16.3 h1:PnCYjPCah8FK4I26l2F/KQ4yz3sILcVUN3cTlBFA9Pg=
@@ -294,6 +293,8 @@ go.uber.org/atomic v1.11.0 h1:ZvwS0R+56ePWxUNi+Atn9dWONBPp/AUETXlHW0DxSjE=
 go.uber.org/atomic v1.11.0/go.mod h1:LUxbIzbOniOlMKjJjyPfpl4v+PKK2cNJn91OQbhoJI0=
 go.uber.org/goleak v1.3.0 h1:2K3zAYmnTNqV73imy9J1T3WC+gmCePx2hEGkimedGto=
 go.uber.org/goleak v1.3.0/go.mod h1:CoHD4mav9JJNrW/WLlf7HGZPjdw8EucARQHekz1X6bE=
+go.yaml.in/yaml/v3 v3.0.5 h1:N6y/pJk8buWs9NY5ERU2HSMfm+IuD/OtfdAnq6kESPw=
+go.yaml.in/yaml/v3 v3.0.5/go.mod h1:HVTZu1O7/Vkt2N+BFy8Zza+lnLsABggaTM2ZpNIGuKg=
 golang.org/x/crypto v0.0.0-20190308221718-c2843e01d9a2/go.mod h1:djNgcEr1/C05ACkg1iLfiJU5Ep61QUkGW8qpdssI0+w=
 golang.org/x/crypto v0.0.0-20210921155107-089bfa567519/go.mod h1:GvvjBRRGRdwPK5ydBHafDWAxML/pGHZbMvKqRZ5+Abc=
 golang.org/x/crypto v0.16.0/go.mod h1:gCAAfMLgwOJRpTjQ2zCCt2OcSfYMTeZVSRtQlPC7Nq4=
@@ -314,8 +315,8 @@ golang.org/x/net v0.54.0/go.mod h1:Sj4oj8jK6XmHpBZU/zWHw3BV3abl4Kvi+Ut7cQcY+cQ=
 golang.org/x/sync v0.0.0-20190423024810-112230192c58/go.mod h1:RxMgew5VJxzue5/jJTE5uejpjVlOe/izrB70Jof72aM=
 golang.org/x/sync v0.0.0-20220722155255-886fb9371eb4/go.mod h1:RxMgew5VJxzue5/jJTE5uejpjVlOe/izrB70Jof72aM=
 golang.org/x/sync v0.1.0/go.mod h1:RxMgew5VJxzue5/jJTE5uejpjVlOe/izrB70Jof72aM=
-golang.org/x/sync v0.20.0 h1:e0PTpb7pjO8GAtTs2dQ6jYa5BWYlMuX047Dco/pItO4=
-golang.org/x/sync v0.20.0/go.mod h1:9xrNwdLfx4jkKbNva9FpL6vEN7evnE43NNNJQ2LF3+0=
+golang.org/x/sync v0.22.0 h1:SZjpbeLmrCk4xhRSZFNZW5gFUeCeFgjekvI/+gfScek=
+golang.org/x/sync v0.22.0/go.mod h1:9xrNwdLfx4jkKbNva9FpL6vEN7evnE43NNNJQ2LF3+0=
 golang.org/x/sys v0.0.0-20190215142949-d0b11bdaac8a/go.mod h1:STP8DvDyc/dI5b8T5hshtkjS+E42TnysNCUPdjciGhY=
 golang.org/x/sys v0.0.0-20190916202348-b4ddaad3f8a3/go.mod h1:h1NjWce9XRLGQEsW7wpKNCjG9DtNlClVuFLEZdDNbEs=
 golang.org/x/sys v0.0.0-20201119102817-f84b799fce68/go.mod h1:h1NjWce9XRLGQEsW7wpKNCjG9DtNlClVuFLEZdDNbEs=
@@ -330,8 +331,8 @@ golang.org/x/sys v0.6.0/go.mod h1:oPkhp1MJrh7nUepCBck5+mAzfO9JrbApNNgaTdGDITg=
 golang.org/x/sys v0.8.0/go.mod h1:oPkhp1MJrh7nUepCBck5+mAzfO9JrbApNNgaTdGDITg=
 golang.org/x/sys v0.12.0/go.mod h1:oPkhp1MJrh7nUepCBck5+mAzfO9JrbApNNgaTdGDITg=
 golang.org/x/sys v0.15.0/go.mod h1:/VUhepiaJMQUp4+oa/7Zr1D23ma6VTLIYjOOTFZPUcA=
-golang.org/x/sys v0.45.0 h1:dO4czNzziLiiXplLQgBCEpCvXQ3dnkn0SdaZSYdQ+FY=
-golang.org/x/sys v0.45.0/go.mod h1:4GL1E5IUh+htKOUEOaiffhrAeqysfVGipDYzABqnCmw=
+golang.org/x/sys v0.47.0 h1:o7XGOvZQCADBQQ4Y7VNq2dRWQR7JmOUW8Kxx4ZsNgWs=
+golang.org/x/sys v0.47.0/go.mod h1:4GL1E5IUh+htKOUEOaiffhrAeqysfVGipDYzABqnCmw=
 golang.org/x/term v0.0.0-20201126162022-7de9c90e9dd1/go.mod h1:bj7SfCRtBDWHUb9snDiAeCFNEtKQo2Wmx5Cou7ajbmo=
 golang.org/x/term v0.0.0-20210927222741-03fcf44c2211/go.mod h1:jbD1KX2456YbFQfuXm/mYQcufACuNUgVhRMnK/tPxf8=
 golang.org/x/term v0.5.0/go.mod h1:jMB1sMXY+tzblOD4FWmEbocvup2/aLOaQEp7JmGp78k=

blocklists/go.mod

@@ -31,7 +31,6 @@ require (
 	github.com/mattn/go-isatty v0.0.20 // indirect
 	github.com/montanaflynn/stats v0.7.1 // indirect
 	github.com/munnerz/goautoneg v0.0.0-20191010083416-a7dc8b61c822 // indirect
-	github.com/pmezard/go-difflib v1.0.0 // indirect
 	github.com/prometheus/client_model v0.6.2 // indirect
 	github.com/prometheus/common v0.66.1 // indirect
 	github.com/prometheus/procfs v0.16.1 // indirect
@@ -42,20 +41,19 @@ require (
 	github.com/yuin/gopher-lua v1.1.1 // indirect
 	go.uber.org/atomic v1.11.0 // indirect
 	go.yaml.in/yaml/v2 v2.4.2 // indirect
+	go.yaml.in/yaml/v3 v3.0.5 // indirect
 	golang.org/x/crypto v0.52.0 // indirect
-	golang.org/x/sync v0.20.0 // indirect
-	golang.org/x/sys v0.45.0 // indirect
+	golang.org/x/sync v0.22.0 // indirect
+	golang.org/x/sys v0.47.0 // indirect
 	golang.org/x/text v0.37.0 // indirect
 	google.golang.org/protobuf v1.36.8 // indirect
-	gopkg.in/yaml.v3 v3.0.1 // indirect
 )
 
 require (
 	github.com/cespare/xxhash/v2 v2.3.0 // indirect
-	github.com/davecgh/go-spew v1.1.1 // indirect
 	github.com/dgryski/go-rendezvous v0.0.0-20200823014737-9f7001d12a5f // indirect
 	github.com/robfig/cron/v3 v3.0.1
 	github.com/rs/zerolog v1.34.0
 	github.com/spf13/cast v1.7.0
-	github.com/stretchr/testify v1.11.1
+	github.com/stretchr/testify v1.12.1
 )

blocklists/go.sum

@@ -100,8 +100,6 @@ github.com/pingcap/errors v0.11.4 h1:lFuQV/oaUMGcD2tqt+01ROSmJs75VG1ToEOkZIZ4nE4
 github.com/pingcap/errors v0.11.4/go.mod h1:Oi8TUi2kEtXXLMJk9l1cGmz20kV3TaQ0usTwv5KuLY8=
 github.com/pkg/errors v0.9.1 h1:FEBLx1zS214owpjy7qsBeixbURkuhQAwrK5UwLGTwt4=
 github.com/pkg/errors v0.9.1/go.mod h1:bwawxfHBFNV+L2hUp1rHADufV3IMtnDRdf1r5NINEl0=
-github.com/pmezard/go-difflib v1.0.0 h1:4DBwDE0NGyQoBHbLQYPwSUPoCMWR5BEzIk/f1lZbAQM=
-github.com/pmezard/go-difflib v1.0.0/go.mod h1:iKH77koFhYxTK1pcRnkKkqfTogsbg7gZNVY4sRDYZ/4=
 github.com/prometheus/client_golang v1.23.2 h1:Je96obch5RDVy3FDMndoUsjAhG5Edi49h0RJWRi/o0o=
 github.com/prometheus/client_golang v1.23.2/go.mod h1:Tb1a6LWHB3/SPIzCoaDXI4I8UHKeFTEQ1YCr+0Gyqmg=
 github.com/prometheus/client_model v0.6.2 h1:oBsgwpGs7iVziMvrGhE53c/GrLUsZdHnqNwqPLxwZyk=
@@ -121,8 +119,8 @@ github.com/rs/zerolog v1.34.0 h1:k43nTLIwcTVQAncfCw4KZ2VY6ukYoZaBPNOE8txlOeY=
 github.com/rs/zerolog v1.34.0/go.mod h1:bJsvje4Z08ROH4Nhs5iH600c3IkWhwp44iRc54W6wYQ=
 github.com/spf13/cast v1.7.0 h1:ntdiHjuueXFgm5nzDRdOS4yfT43P5Fnud6DH50rz/7w=
 github.com/spf13/cast v1.7.0/go.mod h1:ancEpBxwJDODSW/UG4rDrAqiKolqNNh2DX3mk86cAdo=
-github.com/stretchr/testify v1.11.1 h1:7s2iGBzp5EwR7/aIZr8ao5+dra3wiQyKjjFuvgVKu7U=
-github.com/stretchr/testify v1.11.1/go.mod h1:wZwfW3scLgRK+23gO65QZefKpKQRnfz6sD981Nm4B6U=
+github.com/stretchr/testify v1.12.1 h1:EuwCh5fleGS7H32xRwO3wRGT7DxrDhLAT6FF8MpWDWE=
+github.com/stretchr/testify v1.12.1/go.mod h1:MDEgiDPPsNp5cuIrHPPCyornHKgEVbtFUmoNlxoYthg=
 github.com/xdg-go/pbkdf2 v1.0.0 h1:Su7DPu48wXMwC3bs7MCNG+z4FhcyEuz5dlvchbq0B0c=
 github.com/xdg-go/pbkdf2 v1.0.0/go.mod h1:jrpuAogTd400dnrH08LKmI/xc1MbPOebTwRqcT5RDeI=
 github.com/xdg-go/scram v1.1.2 h1:FHX5I5B4i4hKRVRBCFRxq1iQRej7WO3hhBuJf+UUySY=
@@ -150,6 +148,8 @@ go.uber.org/goleak v1.3.0 h1:2K3zAYmnTNqV73imy9J1T3WC+gmCePx2hEGkimedGto=
 go.uber.org/goleak v1.3.0/go.mod h1:CoHD4mav9JJNrW/WLlf7HGZPjdw8EucARQHekz1X6bE=
 go.yaml.in/yaml/v2 v2.4.2 h1:DzmwEr2rDGHl7lsFgAHxmNz/1NlQ7xLIrlN2h5d1eGI=
 go.yaml.in/yaml/v2 v2.4.2/go.mod h1:081UH+NErpNdqlCXm3TtEran0rJZGxAYx9hb/ELlsPU=
+go.yaml.in/yaml/v3 v3.0.5 h1:N6y/pJk8buWs9NY5ERU2HSMfm+IuD/OtfdAnq6kESPw=
+go.yaml.in/yaml/v3 v3.0.5/go.mod h1:HVTZu1O7/Vkt2N+BFy8Zza+lnLsABggaTM2ZpNIGuKg=
 golang.org/x/crypto v0.0.0-20190308221718-c2843e01d9a2/go.mod h1:djNgcEr1/C05ACkg1iLfiJU5Ep61QUkGW8qpdssI0+w=
 golang.org/x/crypto v0.0.0-20210921155107-089bfa567519/go.mod h1:GvvjBRRGRdwPK5ydBHafDWAxML/pGHZbMvKqRZ5+Abc=
 golang.org/x/crypto v0.52.0 h1:RMs7fP2rXdep0CftQlK8Uf+kibLm7qkCcradZWYz988=
@@ -160,8 +160,8 @@ golang.org/x/net v0.0.0-20210226172049-e18ecbb05110/go.mod h1:m0MpNAwzfU5UDzcl9v
 golang.org/x/net v0.0.0-20220722155237-a158d28d115b/go.mod h1:XRhObCWvk6IyKnWLug+ECip1KBveYUHfp+8e9klMJ9c=
 golang.org/x/sync v0.0.0-20190423024810-112230192c58/go.mod h1:RxMgew5VJxzue5/jJTE5uejpjVlOe/izrB70Jof72aM=
 golang.org/x/sync v0.0.0-20220722155255-886fb9371eb4/go.mod h1:RxMgew5VJxzue5/jJTE5uejpjVlOe/izrB70Jof72aM=
-golang.org/x/sync v0.20.0 h1:e0PTpb7pjO8GAtTs2dQ6jYa5BWYlMuX047Dco/pItO4=
-golang.org/x/sync v0.20.0/go.mod h1:9xrNwdLfx4jkKbNva9FpL6vEN7evnE43NNNJQ2LF3+0=
+golang.org/x/sync v0.22.0 h1:SZjpbeLmrCk4xhRSZFNZW5gFUeCeFgjekvI/+gfScek=
+golang.org/x/sync v0.22.0/go.mod h1:9xrNwdLfx4jkKbNva9FpL6vEN7evnE43NNNJQ2LF3+0=
 golang.org/x/sys v0.0.0-20190215142949-d0b11bdaac8a/go.mod h1:STP8DvDyc/dI5b8T5hshtkjS+E42TnysNCUPdjciGhY=
 golang.org/x/sys v0.0.0-20201119102817-f84b799fce68/go.mod h1:h1NjWce9XRLGQEsW7wpKNCjG9DtNlClVuFLEZdDNbEs=
 golang.org/x/sys v0.0.0-20210615035016-665e8c7367d1/go.mod h1:oPkhp1MJrh7nUepCBck5+mAzfO9JrbApNNgaTdGDITg=
@@ -170,8 +170,8 @@ golang.org/x/sys v0.0.0-20220722155257-8c9f86f7a55f/go.mod h1:oPkhp1MJrh7nUepCBc
 golang.org/x/sys v0.0.0-20220811171246-fbc7d0a398ab/go.mod h1:oPkhp1MJrh7nUepCBck5+mAzfO9JrbApNNgaTdGDITg=
 golang.org/x/sys v0.6.0/go.mod h1:oPkhp1MJrh7nUepCBck5+mAzfO9JrbApNNgaTdGDITg=
 golang.org/x/sys v0.12.0/go.mod h1:oPkhp1MJrh7nUepCBck5+mAzfO9JrbApNNgaTdGDITg=
-golang.org/x/sys v0.45.0 h1:dO4czNzziLiiXplLQgBCEpCvXQ3dnkn0SdaZSYdQ+FY=
-golang.org/x/sys v0.45.0/go.mod h1:4GL1E5IUh+htKOUEOaiffhrAeqysfVGipDYzABqnCmw=
+golang.org/x/sys v0.47.0 h1:o7XGOvZQCADBQQ4Y7VNq2dRWQR7JmOUW8Kxx4ZsNgWs=
+golang.org/x/sys v0.47.0/go.mod h1:4GL1E5IUh+htKOUEOaiffhrAeqysfVGipDYzABqnCmw=
 golang.org/x/term v0.0.0-20201126162022-7de9c90e9dd1/go.mod h1:bj7SfCRtBDWHUb9snDiAeCFNEtKQo2Wmx5Cou7ajbmo=
 golang.org/x/term v0.0.0-20210927222741-03fcf44c2211/go.mod h1:jbD1KX2456YbFQfuXm/mYQcufACuNUgVhRMnK/tPxf8=
 golang.org/x/text v0.3.0/go.mod h1:NqM8EUOU14njkJ3fqMW+pc6Ldnwhi/IjpwHt7yyuwOQ=
@@ -189,5 +189,3 @@ google.golang.org/protobuf v1.36.8/go.mod h1:fuxRtAxBytpl4zzqUh6/eyUujkJdNiuEkXn
 gopkg.in/check.v1 v0.0.0-20161208181325-20d25e280405/go.mod h1:Co6ibVJAznAaIkqp8huTwlJQCZ016jof/cbN4VW5Yz0=
 gopkg.in/check.v1 v1.0.0-20201130134442-10cb98267c6c h1:Hei/4ADfdWqJk1ZMxUNpqntNwaWcugrBjAiHlqqRiVk=
 gopkg.in/check.v1 v1.0.0-20201130134442-10cb98267c6c/go.mod h1:JHkPIbrfpd72SG/EVd6muEfDQjcINNoR0C8j2r3qZ4Q=
-gopkg.in/yaml.v3 v3.0.1 h1:fxVm/GzAzEWqLHuvctI91KS9hhNmmWOoWu0XTYJS7CA=
-gopkg.in/yaml.v3 v3.0.1/go.mod h1:K4uyk7z7BCEPqu6E+C64Yfv1cQ7kz7rIZviUmN+EgEM=

compose.dnscheck.yml

@@ -16,7 +16,6 @@ services:
     volumes:
       - ./dnscheck:/app
       - ./dev/bootstrap/GeoLite2-ASN/:/opt/dnscheck/GeoIP
-      - ./dev/bootstrap/GeoLite2-City/:/opt/dnscheck/GeoIPCity
       # - ./dev/certs:/certs
     env_file:
       - ./dnscheck/.env

dnscheck/api/check.go

@@ -49,10 +49,7 @@ func (s *APIServer) DnsCheck() fiber.Handler {
 			return HandleError(c, err, ErrFailedToUnmarshalRecord)
 		}
 
-		return c.Status(200).JSON(dns.DNSCheckResponse{
-			Status:    dnsRecord.Status,
-			ProfileId: dnsRecord.ProfileId,
-		})
+		return c.Status(200).JSON(dns.DNSCheckResponse(dnsRecord))
 	}
 	return handler
 }

dnscheck/cache/cache.go

@@ -16,8 +16,7 @@ type Cache interface {
 
 // New creates a new Cache instance whose entries expire after ttl.
 func New(cacheType string, ttl time.Duration) (Cache, error) {
-	switch cacheType {
-	case CacheTypeBigCache:
+	if cacheType == CacheTypeBigCache {
 		return NewBigcache(ttl)
 	}
 	return nil, errors.New("unknown cache type")

dnscheck/config/config.go

@@ -83,9 +83,14 @@ type CacheConfig struct {
 	HMACKey string
 }
 
+// DefaultGeoIPDBReload is how often the ASN database file is checked for a
+// refreshed build when GEOIP_DB_RELOAD is unset.
+const DefaultGeoIPDBReload = 15 * time.Minute
+
 // GeoLookupConfig represents access to the MaxMind GeoIP ASN database
 type GeoLookupConfig struct {
-	DBASNFile string
+	DBASNFile   string
+	ReloadEvery time.Duration
 }
 
 // IsValid check whether config section is valid
@@ -123,8 +128,18 @@ func New() (*Config, error) {
 		return nil, errors.New("CACHE_HMAC_KEY environment variable is required")
 	}
 
+	geoReload := DefaultGeoIPDBReload
+	if raw := os.Getenv("GEOIP_DB_RELOAD"); raw != "" {
+		parsed, err := time.ParseDuration(raw)
+		if err != nil || parsed <= 0 {
+			return nil, fmt.Errorf("GEOIP_DB_RELOAD must be a positive duration, got %q", raw)
+		}
+		geoReload = parsed
+	}
+
 	geoLookup := &GeoLookupConfig{
-		DBASNFile: os.Getenv("GEOIP_DB_ASN_FILE"),
+		DBASNFile:   os.Getenv("GEOIP_DB_ASN_FILE"),
+		ReloadEvery: geoReload,
 	}
 	if err := geoLookup.IsValid(); err != nil {
 		return nil, err

dnscheck/config/config_test.go

@@ -129,3 +129,35 @@ func TestNewCacheTTLDefaultsAndValidates(t *testing.T) {
 		}
 	}
 }
+
+// specRef: dnscheck-behaviour.md #S8
+func TestNewGeoIPReloadDefaultsAndValidates(t *testing.T) {
+	t.Setenv("CACHE_HMAC_KEY", "test-key")
+	t.Setenv("GEOIP_DB_ASN_FILE", "/opt/dnscheck/GeoLite2-ASN.mmdb")
+	t.Setenv("DNS_AUTH_SERVER_IP_RANGE", "10.5.0.0/16")
+
+	t.Setenv("GEOIP_DB_RELOAD", "")
+	cfg, err := New()
+	if err != nil {
+		t.Fatalf("unexpected error: %v", err)
+	}
+	if cfg.GeoLookupConfig.ReloadEvery != DefaultGeoIPDBReload {
+		t.Errorf("ReloadEvery = %v, want default %v", cfg.GeoLookupConfig.ReloadEvery, DefaultGeoIPDBReload)
+	}
+
+	t.Setenv("GEOIP_DB_RELOAD", "1h")
+	cfg, err = New()
+	if err != nil {
+		t.Fatalf("unexpected error: %v", err)
+	}
+	if cfg.GeoLookupConfig.ReloadEvery != time.Hour {
+		t.Errorf("ReloadEvery = %v, want 1h", cfg.GeoLookupConfig.ReloadEvery)
+	}
+
+	for _, bad := range []string{"daily", "-15m", "0"} {
+		t.Setenv("GEOIP_DB_RELOAD", bad)
+		if _, err := New(); err == nil {
+			t.Errorf("expected an error for GEOIP_DB_RELOAD=%q", bad)
+		}
+	}
+}

dnscheck/dns/handler.go

@@ -171,7 +171,9 @@ func (h *Handler) ServeDNS(w dns.ResponseWriter, r *dns.Msg) {
 	default:
 		msg.Ns = h.createSOA()
 	}
-	w.WriteMsg(&msg)
+	if err := w.WriteMsg(&msg); err != nil {
+		log.Error().Err(err).Msg("Failed to write DNS response")
+	}
 }
 
 func (h *Handler) extractConfiguredProfileId(r *dns.Msg) (profileId string) {
@@ -203,7 +205,7 @@ func (h *Handler) createSOA() []dns.RR {
 				Ttl:    TTL},
 			Ns:      "ns1." + dom,
 			Mbox:    "hostmaster." + dom,
-			Serial:  uint32(time.Now().Truncate(time.Hour).Unix()),
+			Serial:  soaSerial(time.Now()),
 			Refresh: 28800,
 			Retry:   7200,
 			Expire:  604800,
@@ -212,6 +214,16 @@ func (h *Handler) createSOA() []dns.RR {
 	}
 }
 
+// soaSerial is the hour-truncated Unix time. RFC 1035 §3.3.13 makes SERIAL a
+// 32-bit unsigned value, which Unix seconds exceed only in 2106.
+func soaSerial(now time.Time) uint32 {
+	s := now.Truncate(time.Hour).Unix()
+	if s < 0 || s > 1<<32-1 {
+		return 0
+	}
+	return uint32(s)
+}
+
 // clientIP returns the transport-level source address of the query. It is read
 // straight from the socket address and never resolved.
 func clientIP(addr net.Addr) (net.IP, error) {

dnscheck/dns/server.go

@@ -1,12 +1,14 @@
 package dns
 
 import (
+	"context"
 	"fmt"
 
 	"github.com/dnscheck/cache"
 	"github.com/dnscheck/config"
 	"github.com/dnscheck/internal/maxmind"
 	"github.com/miekg/dns"
+	"github.com/rs/zerolog/log"
 )
 
 // GeoLookuper resolves a client IP to its ASN record.
@@ -37,6 +39,13 @@ func New(config *config.Config, cache cache.Cache) (*DNSServer, error) {
 		return nil, fmt.Errorf("geoip: %w", err)
 	}
 	srv.GeoLookup = geoLookup
+	// The file is refreshed on disk by geoipupdate; follow it without a restart.
+	go geoLookup.Watch(context.Background(), config.GeoLookupConfig.ReloadEvery)
+	log.Info().
+		Str("path", config.GeoLookupConfig.DBASNFile).
+		Time("build_time", geoLookup.Stats().BuildTime).
+		Dur("reload_every", config.GeoLookupConfig.ReloadEvery).
+		Msg("GeoIP ASN database loaded")
 
 	// DNS
 	srv.DNSTCP = &dns.Server{Addr: ":53", Net: "tcp"}