From 3660b4810e6accaa5a1449b332bb8a746cc64e92 Mon Sep 17 00:00:00 2001 From: Ainar Garipov Date: Fri, 2 Sep 2022 14:52:19 +0300 Subject: [PATCH] Pull request: 4865-refactor-dns-handlers Updates #4865. Squashed commit of the following: commit b874088ee72dfd0cae5f4102fac87e1f26245ddf Author: Ainar Garipov Date: Fri Sep 2 14:01:52 2022 +0300 dnsforward: imp code, docs commit a1b95fda58b777a54e7dcd57f0c419200f8fdc15 Author: Ainar Garipov Date: Thu Sep 1 19:37:45 2022 +0300 all: refactor dns handler; opt --- go.mod | 19 +-- go.sum | 216 ++--------------------- internal/dnsforward/dns.go | 226 ++++++++++++++----------- internal/dnsforward/dnsrewrite.go | 30 ++-- internal/dnsforward/dnsrewrite_test.go | 4 +- internal/dnsforward/filter.go | 107 +++++++----- internal/filtering/dnsrewrite.go | 10 +- internal/filtering/filtering.go | 32 ++-- internal/filtering/safebrowsing.go | 8 +- internal/filtering/safesearch.go | 4 +- internal/querylog/decode_test.go | 22 +-- internal/querylog/qlog_test.go | 4 +- 12 files changed, 272 insertions(+), 410 deletions(-) diff --git a/go.mod b/go.mod index 018afe80..cad7a7f7 100644 --- a/go.mod +++ b/go.mod @@ -7,7 +7,7 @@ require ( github.com/AdguardTeam/golibs v0.10.9 github.com/AdguardTeam/urlfilter v0.16.0 github.com/NYTimes/gziphandler v1.1.1 - github.com/ameshkov/dnscrypt/v2 v2.2.3 + github.com/ameshkov/dnscrypt/v2 v2.2.5 github.com/digineo/go-ipset/v2 v2.2.1 github.com/dimfeld/httptreemux/v5 v5.4.0 github.com/fsnotify/fsnotify v1.5.4 @@ -18,20 +18,20 @@ require ( github.com/google/uuid v1.3.0 github.com/insomniacslk/dhcp v0.0.0-20220504074936-1ca156eafb9f github.com/kardianos/service v1.2.1 - github.com/lucas-clemente/quic-go v0.28.1 + github.com/lucas-clemente/quic-go v0.29.0 github.com/mdlayher/ethernet v0.0.0-20220221185849-529eae5b6118 github.com/mdlayher/netlink v1.6.0 // TODO(a.garipov): This package is deprecated; find a new one or use // our own code for that. Perhaps, use gopacket. github.com/mdlayher/raw v0.1.0 github.com/miekg/dns v1.1.50 - github.com/stretchr/testify v1.7.1 + github.com/stretchr/testify v1.8.0 github.com/ti-mo/netfilter v0.4.0 go.etcd.io/bbolt v1.3.6 - golang.org/x/crypto v0.0.0-20220817201139-bc19a97f63c8 - golang.org/x/exp v0.0.0-20220722155223-a9213eeb770e - golang.org/x/net v0.0.0-20220812174116-3211cb980234 - golang.org/x/sys v0.0.0-20220817070843-5a390386f1f2 + golang.org/x/crypto v0.0.0-20220829220503-c86fa9a7ed90 + golang.org/x/exp v0.0.0-20220827204233-334a2380cb91 + golang.org/x/net v0.0.0-20220826154423-83b083e8dc8b + golang.org/x/sys v0.0.0-20220829200755-d48e67d00261 gopkg.in/natefinch/lumberjack.v2 v2.0.0 gopkg.in/yaml.v3 v3.0.1 howett.net/plist v1.0.0 @@ -43,12 +43,10 @@ require ( github.com/aead/poly1305 v0.0.0-20180717145839-3fee0db0b635 // indirect github.com/ameshkov/dnsstamps v1.0.3 // indirect github.com/beefsack/go-rate v0.0.0-20220214233405-116f4ca011a0 // indirect - github.com/cheekybits/genny v1.0.0 // indirect github.com/davecgh/go-spew v1.1.1 // indirect github.com/go-task/slim-sprig v0.0.0-20210107165309-348f09dbbbc0 // indirect + github.com/golang/mock v1.6.0 // indirect github.com/josharian/native v1.0.0 // indirect - github.com/marten-seemann/qtls-go1-16 v0.1.5 // indirect - github.com/marten-seemann/qtls-go1-17 v0.1.2 // indirect github.com/marten-seemann/qtls-go1-18 v0.1.2 // indirect github.com/marten-seemann/qtls-go1-19 v0.1.0 // indirect github.com/mdlayher/packet v1.0.0 // indirect @@ -58,7 +56,6 @@ require ( github.com/patrickmn/go-cache v2.1.0+incompatible // indirect github.com/pkg/errors v0.9.1 // indirect github.com/pmezard/go-difflib v1.0.0 // indirect - github.com/stretchr/objx v0.1.1 // indirect github.com/u-root/uio v0.0.0-20220204230159-dac05f7d2cb4 // indirect golang.org/x/mod v0.6.0-dev.0.20220818022119-ed83ed61efb9 // indirect golang.org/x/sync v0.0.0-20220722155255-886fb9371eb4 // indirect diff --git a/go.sum b/go.sum index 240544dc..efc6ded5 100644 --- a/go.sum +++ b/go.sum @@ -1,23 +1,12 @@ -cloud.google.com/go v0.26.0/go.mod h1:aQUYkXzVsufM+DwF1aE+0xfcU+56JwCaLick0ClmMTw= -cloud.google.com/go v0.31.0/go.mod h1:aQUYkXzVsufM+DwF1aE+0xfcU+56JwCaLick0ClmMTw= -cloud.google.com/go v0.34.0/go.mod h1:aQUYkXzVsufM+DwF1aE+0xfcU+56JwCaLick0ClmMTw= -cloud.google.com/go v0.37.0/go.mod h1:TS1dMSSfndXH133OKGwekG838Om/cQT0BUHV3HcBgoo= -dmitri.shuralyov.com/app/changes v0.0.0-20180602232624-0a106ad413e3/go.mod h1:Yl+fi1br7+Rr3LqpNJf1/uxUdtRUV+Tnj0o93V2B9MU= -dmitri.shuralyov.com/html/belt v0.0.0-20180602232347-f7d459c86be0/go.mod h1:JLBrvjyP0v+ecvNYvCpyZgu5/xkfAUhi6wJj28eUfSU= -dmitri.shuralyov.com/service/change v0.0.0-20181023043359-a85b471d5412/go.mod h1:a1inKt/atXimZ4Mv927x+r7UpyzRUf4emIoiiSC2TN4= -dmitri.shuralyov.com/state v0.0.0-20180228185332-28bcc343414c/go.mod h1:0PRwlb0D6DFvNNtx+9ybjezNCa8XF0xaYcETyp6rHWU= -git.apache.org/thrift.git v0.0.0-20180902110319-2566ecd5d999/go.mod h1:fPE2ZNJGynbRyZ4dJvy6G277gSllfV2HJqblrnkyeyg= github.com/AdguardTeam/dnsproxy v0.44.0 h1:JzIxEXF4OyJq4wZVHeZkM1af4VfuwcgrUzjgdBGljsE= github.com/AdguardTeam/dnsproxy v0.44.0/go.mod h1:HsxYYW/bC8uo+4eX9pRW21hFD6gWZdrvcfBb1R6/AzU= github.com/AdguardTeam/golibs v0.4.0/go.mod h1:skKsDKIBB7kkFflLJBpfGX+G8QFTx0WKUzB6TIgtUj4= -github.com/AdguardTeam/golibs v0.4.2/go.mod h1:skKsDKIBB7kkFflLJBpfGX+G8QFTx0WKUzB6TIgtUj4= github.com/AdguardTeam/golibs v0.10.4/go.mod h1:rSfQRGHIdgfxriDDNgNJ7HmE5zRoURq8R+VdR81Zuzw= github.com/AdguardTeam/golibs v0.10.9 h1:F9oP2da0dQ9RQDM1lGR7LxUTfUWu8hEFOs4icwAkKM0= github.com/AdguardTeam/golibs v0.10.9/go.mod h1:W+5rznZa1cSNSFt+gPS7f4Wytnr9fOrd5ZYqwadPw14= github.com/AdguardTeam/gomitmproxy v0.2.0/go.mod h1:Qdv0Mktnzer5zpdpi5rAwixNJzW2FN91LjKJCkVbYGU= github.com/AdguardTeam/urlfilter v0.16.0 h1:IO29m+ZyQuuOnPLTzHuXj35V1DZOp1Dcryl576P2syg= github.com/AdguardTeam/urlfilter v0.16.0/go.mod h1:46YZDOV1+qtdRDuhZKVPSSp7JWWes0KayqHrKAFBdEI= -github.com/BurntSushi/toml v0.3.1/go.mod h1:xHWCNGjB5oqiDr8zfno3MHue2Ht5sIBksp03qcyfWMU= github.com/BurntSushi/toml v1.1.0 h1:ksErzDEI1khOiGPgpwuI7x2ebx/uXQNw7xJpn9Eq1+I= github.com/BurntSushi/toml v1.1.0/go.mod h1:CxXYINrC8qIiEnFrOxCa7Jy5BFHlXnUU2pbicEuybxQ= github.com/NYTimes/gziphandler v1.1.1 h1:ZUDjpQae29j0ryrS0u/B8HZfJBtBQHjqw2rQ2cqUQ3I= @@ -28,21 +17,12 @@ github.com/aead/chacha20 v0.0.0-20180709150244-8b13a72661da h1:KjTM2ks9d14ZYCvmH github.com/aead/chacha20 v0.0.0-20180709150244-8b13a72661da/go.mod h1:eHEWzANqSiWQsof+nXEI9bUVUyV6F53Fp89EuCh2EAA= github.com/aead/poly1305 v0.0.0-20180717145839-3fee0db0b635 h1:52m0LGchQBBVqJRyYYufQuIbVqRawmubW3OFGqK1ekw= github.com/aead/poly1305 v0.0.0-20180717145839-3fee0db0b635/go.mod h1:lmLxL+FV291OopO93Bwf9fQLQeLyt33VJRUg5VJ30us= -github.com/ameshkov/dnscrypt/v2 v2.2.3 h1:X9UP5AHtwp46Ji+sGFfF/1Is6OPI/SjxLqhKpx0P5UI= -github.com/ameshkov/dnscrypt/v2 v2.2.3/go.mod h1:xJB9cE1/GF+NB6EEQqRlkoa4bjcV2w7VYn1G+zVq7Bs= -github.com/ameshkov/dnsstamps v1.0.1/go.mod h1:Ii3eUu73dx4Vw5O4wjzmT5+lkCwovjzaEZZ4gKyIH5A= +github.com/ameshkov/dnscrypt/v2 v2.2.5 h1:Ju1gQeez+6XLtk/b/k3RoJ2t+Ls+BSItLTZjZeedneY= +github.com/ameshkov/dnscrypt/v2 v2.2.5/go.mod h1:Cu5GgMvCR10BeXgACiGDwXyOpfMktsSIidml1XBp6uM= github.com/ameshkov/dnsstamps v1.0.3 h1:Srzik+J9mivH1alRACTbys2xOxs0lRH9qnTA7Y1OYVo= github.com/ameshkov/dnsstamps v1.0.3/go.mod h1:Ii3eUu73dx4Vw5O4wjzmT5+lkCwovjzaEZZ4gKyIH5A= -github.com/anmitsu/go-shlex v0.0.0-20161002113705-648efa622239/go.mod h1:2FmKhYUyUczH0OGQWaF5ceTx0UBShxjsH6f8oGKYe2c= github.com/beefsack/go-rate v0.0.0-20220214233405-116f4ca011a0 h1:0b2vaepXIfMsG++IsjHiI2p4bxALD1Y2nQKGMR5zDQM= github.com/beefsack/go-rate v0.0.0-20220214233405-116f4ca011a0/go.mod h1:6YNgTHLutezwnBvyneBbwvB8C82y3dcoOj5EQJIdGXA= -github.com/beorn7/perks v0.0.0-20180321164747-3a771d992973/go.mod h1:Dwedo/Wpr24TaqPxmxbtue+5NUziq4I4S80YR8gNf3Q= -github.com/bradfitz/go-smtpd v0.0.0-20170404230938-deb6d6237625/go.mod h1:HYsPBTaaSFSlLx/70C2HPIMNZpVV8+vt/A+FMnYP11g= -github.com/buger/jsonparser v0.0.0-20181115193947-bf1c66bbce23/go.mod h1:bbYlZJ7hK1yFx9hf58LP0zeX7UjIGs20ufpu3evjr+s= -github.com/cheekybits/genny v1.0.0 h1:uGGa4nei+j20rOSeDeP5Of12XVm7TGUd4dJA9RDitfE= -github.com/cheekybits/genny v1.0.0/go.mod h1:+tQajlRqAUrPI7DOSpB0XAqZYtQakVtB7wXkRAgjxjQ= -github.com/client9/misspell v0.3.4/go.mod h1:qj6jICC3Q7zFZvVWo7KLAzC3yx5G7kyvSDkc90ppPyw= -github.com/coreos/go-systemd v0.0.0-20181012123002-c6f51f82210d/go.mod h1:F5haX7vjVVG0kc13fIWeqUViNPyEJxv/OmvnBo0Yme4= github.com/creack/pty v1.1.9/go.mod h1:oKZEueFk5CKHvIhNR5MUki03XCEU+Q6VDXinZuGJ33E= github.com/davecgh/go-spew v1.1.0/go.mod h1:J7Y8YcW2NihsgmVo/mv3lAwl/skON4iLHjSsI+c5H38= github.com/davecgh/go-spew v1.1.1 h1:vj9j/u1bqnvCEfJOwUhtlOARqs3+rkHYY13jYWTU97c= @@ -51,75 +31,49 @@ github.com/digineo/go-ipset/v2 v2.2.1 h1:k6skY+0fMqeUjjeWO/m5OuWPSZUAn7AucHMnQ1M github.com/digineo/go-ipset/v2 v2.2.1/go.mod h1:wBsNzJlZlABHUITkesrggFnZQtgW5wkqw1uo8Qxe0VU= github.com/dimfeld/httptreemux/v5 v5.4.0 h1:IiHYEjh+A7pYbhWyjmGnj5HZK6gpOOvyBXCJ+BE8/Gs= github.com/dimfeld/httptreemux/v5 v5.4.0/go.mod h1:QeEylH57C0v3VO0tkKraVz9oD3Uu93CKPnTLbsidvSw= -github.com/dustin/go-humanize v1.0.0/go.mod h1:HtrtbFcZ19U5GC7JDqmcUSB87Iq5E25KnS6fMYU6eOk= github.com/fanliao/go-promise v0.0.0-20141029170127-1890db352a72/go.mod h1:PjfxuH4FZdUyfMdtBio2lsRr1AKEaVPwelzuHuh8Lqc= -github.com/flynn/go-shlex v0.0.0-20150515145356-3f9db97f8568/go.mod h1:xEzjJPgXI435gkrCt3MPfRiAkVrwSbHsst4LCFVfpJc= -github.com/francoispqt/gojay v1.2.13/go.mod h1:ehT5mTG4ua4581f1++1WLG0vPdaA9HaiDsoyrBGkyDY= github.com/fsnotify/fsnotify v1.4.7/go.mod h1:jwhsz4b93w/PPRr/qN1Yymfu8t87LnFCMoQvtojpjFo= github.com/fsnotify/fsnotify v1.4.9/go.mod h1:znqG4EE+3YCdAaPaxE2ZRY/06pZUdp0tY4IgpuI1SZQ= github.com/fsnotify/fsnotify v1.5.4 h1:jRbGcIw6P2Meqdwuo0H1p6JVLbL5DHKAKlYndzMwVZI= github.com/fsnotify/fsnotify v1.5.4/go.mod h1:OVB6XrOHzAwXMpEM7uPOzcehqUV2UqJxmVXmkdnm1bU= -github.com/ghodss/yaml v1.0.0/go.mod h1:4dBDuWmgqj2HViK6kFavaiC9ZROes6MMH2rRYeMEF04= -github.com/gliderlabs/ssh v0.1.1/go.mod h1:U7qILu1NlMHj9FlMhZLlkCdDnU1DBEAqr0aevW3Awn0= -github.com/go-errors/errors v1.0.1/go.mod h1:f4zRHt4oKfwPJE5k8C9vpYG+aDHdBFUsgrm6/TyX73Q= github.com/go-ole/go-ole v1.2.5 h1:t4MGB5xEDZvXI+0rMjjsfBsD7yAgp/s9ZDkL1JndXwY= github.com/go-ole/go-ole v1.2.5/go.mod h1:pprOEPIfldk/42T2oK7lQ4v4JSDwmV0As9GaiUsvbm0= github.com/go-ping/ping v1.1.0 h1:3MCGhVX4fyEUuhsfwPrsEdQw6xspHkv5zHsiSoDFZYw= github.com/go-ping/ping v1.1.0/go.mod h1:xIFjORFzTxqIV/tDVGO4eDy/bLuSyawEeojSm3GfRGk= github.com/go-task/slim-sprig v0.0.0-20210107165309-348f09dbbbc0 h1:p104kn46Q8WdvHunIJ9dAyjPVtrBPhSr3KT2yUst43I= github.com/go-task/slim-sprig v0.0.0-20210107165309-348f09dbbbc0/go.mod h1:fyg7847qk6SyHyPtNmDHnmrv/HOrqktSC+C9fM+CJOE= -github.com/gogo/protobuf v1.1.1/go.mod h1:r8qH/GZQm5c6nD/R0oafs1akxWv10x8SbQlK7atdtwQ= -github.com/golang/glog v0.0.0-20160126235308-23def4e6c14b/go.mod h1:SBH7ygxi8pfUlaOkMMuAQtPIUF8ecWP5IEl/CR7VP2Q= -github.com/golang/lint v0.0.0-20180702182130-06c8688daad7/go.mod h1:tluoj9z5200jBnyusfRPU2LqT6J+DAorxEvtC7LHB+E= -github.com/golang/mock v1.1.1/go.mod h1:oTYuIxOrZwtPieC+H1uAHpcLFnEyAGVDL/k47Jfbm0A= -github.com/golang/mock v1.2.0/go.mod h1:oTYuIxOrZwtPieC+H1uAHpcLFnEyAGVDL/k47Jfbm0A= -github.com/golang/mock v1.4.4/go.mod h1:l3mdAwkq5BuhzHwde/uurv3sEJeZMXNpwsxVWU71h+4= github.com/golang/mock v1.6.0 h1:ErTB+efbowRARo13NNdxyJji2egdxLGQhRaY+DUumQc= github.com/golang/mock v1.6.0/go.mod h1:p6yTPP+5HYm5mzsMV8JkE6ZKdX+/wYM6Hr+LicevLPs= github.com/golang/protobuf v1.2.0/go.mod h1:6lQm79b+lXiMfvg/cZm0SGofjICqVBUtrP5yJMmIC1U= -github.com/golang/protobuf v1.3.1/go.mod h1:6lQm79b+lXiMfvg/cZm0SGofjICqVBUtrP5yJMmIC1U= github.com/golang/protobuf v1.4.0-rc.1/go.mod h1:ceaxUfeHdC40wWswd/P6IGgMaK3YpKi5j83Wpe3EHw8= github.com/golang/protobuf v1.4.0-rc.1.0.20200221234624-67d41d38c208/go.mod h1:xKAWHe0F5eneWXFV3EuXVDTCmh+JuBKY0li0aMyXATA= github.com/golang/protobuf v1.4.0-rc.2/go.mod 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v0.0.0-20190215142949-d0b11bdaac8a/go.mod h1:STP8DvDyc/dI5b8T5hshtkjS+E42TnysNCUPdjciGhY= golang.org/x/sys v0.0.0-20190312061237-fead79001313/go.mod h1:h1NjWce9XRLGQEsW7wpKNCjG9DtNlClVuFLEZdDNbEs= -golang.org/x/sys v0.0.0-20190316082340-a2f829d7f35f/go.mod h1:h1NjWce9XRLGQEsW7wpKNCjG9DtNlClVuFLEZdDNbEs= golang.org/x/sys v0.0.0-20190322080309-f49334f85ddc/go.mod h1:h1NjWce9XRLGQEsW7wpKNCjG9DtNlClVuFLEZdDNbEs= golang.org/x/sys v0.0.0-20190411185658-b44545bcd369/go.mod h1:h1NjWce9XRLGQEsW7wpKNCjG9DtNlClVuFLEZdDNbEs= golang.org/x/sys v0.0.0-20190412213103-97732733099d/go.mod h1:h1NjWce9XRLGQEsW7wpKNCjG9DtNlClVuFLEZdDNbEs= @@ -357,15 +219,11 @@ golang.org/x/sys v0.0.0-20190606122018-79a91cf218c4/go.mod h1:h1NjWce9XRLGQEsW7w golang.org/x/sys v0.0.0-20190826190057-c7b8b68b1456/go.mod h1:h1NjWce9XRLGQEsW7wpKNCjG9DtNlClVuFLEZdDNbEs= golang.org/x/sys v0.0.0-20190904154756-749cb33beabd/go.mod h1:h1NjWce9XRLGQEsW7wpKNCjG9DtNlClVuFLEZdDNbEs= golang.org/x/sys v0.0.0-20190916202348-b4ddaad3f8a3/go.mod h1:h1NjWce9XRLGQEsW7wpKNCjG9DtNlClVuFLEZdDNbEs= -golang.org/x/sys v0.0.0-20190924154521-2837fb4f24fe/go.mod h1:h1NjWce9XRLGQEsW7wpKNCjG9DtNlClVuFLEZdDNbEs= golang.org/x/sys v0.0.0-20191005200804-aed5e4c7ecf9/go.mod h1:h1NjWce9XRLGQEsW7wpKNCjG9DtNlClVuFLEZdDNbEs= golang.org/x/sys v0.0.0-20191008105621-543471e840be/go.mod h1:h1NjWce9XRLGQEsW7wpKNCjG9DtNlClVuFLEZdDNbEs= golang.org/x/sys v0.0.0-20191120155948-bd437916bb0e/go.mod h1:h1NjWce9XRLGQEsW7wpKNCjG9DtNlClVuFLEZdDNbEs= golang.org/x/sys v0.0.0-20200202164722-d101bd2416d5/go.mod h1:h1NjWce9XRLGQEsW7wpKNCjG9DtNlClVuFLEZdDNbEs= -golang.org/x/sys v0.0.0-20200223170610-d5e6a3e2c0ae/go.mod h1:h1NjWce9XRLGQEsW7wpKNCjG9DtNlClVuFLEZdDNbEs= golang.org/x/sys v0.0.0-20200323222414-85ca7c5b95cd/go.mod h1:h1NjWce9XRLGQEsW7wpKNCjG9DtNlClVuFLEZdDNbEs= -golang.org/x/sys v0.0.0-20200331124033-c3d80250170d/go.mod h1:h1NjWce9XRLGQEsW7wpKNCjG9DtNlClVuFLEZdDNbEs= -golang.org/x/sys v0.0.0-20200519105757-fe76b779f299/go.mod h1:h1NjWce9XRLGQEsW7wpKNCjG9DtNlClVuFLEZdDNbEs= golang.org/x/sys v0.0.0-20200923182605-d9f96fdee20d/go.mod h1:h1NjWce9XRLGQEsW7wpKNCjG9DtNlClVuFLEZdDNbEs= golang.org/x/sys v0.0.0-20200930185726-fdedc70b468f/go.mod h1:h1NjWce9XRLGQEsW7wpKNCjG9DtNlClVuFLEZdDNbEs= golang.org/x/sys v0.0.0-20201009025420-dfb3f7c4e634/go.mod h1:h1NjWce9XRLGQEsW7wpKNCjG9DtNlClVuFLEZdDNbEs= @@ -389,29 +247,19 @@ golang.org/x/sys v0.0.0-20211216021012-1d35b9e2eb4e/go.mod h1:oPkhp1MJrh7nUepCBc golang.org/x/sys v0.0.0-20220128215802-99c3d69c2c27/go.mod h1:oPkhp1MJrh7nUepCBck5+mAzfO9JrbApNNgaTdGDITg= golang.org/x/sys v0.0.0-20220209214540-3681064d5158/go.mod h1:oPkhp1MJrh7nUepCBck5+mAzfO9JrbApNNgaTdGDITg= golang.org/x/sys v0.0.0-20220412211240-33da011f77ad/go.mod h1:oPkhp1MJrh7nUepCBck5+mAzfO9JrbApNNgaTdGDITg= -golang.org/x/sys v0.0.0-20220520151302-bc2c85ada10a/go.mod h1:oPkhp1MJrh7nUepCBck5+mAzfO9JrbApNNgaTdGDITg= -golang.org/x/sys v0.0.0-20220817070843-5a390386f1f2 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h1:Co6ibVJAznAaIkqp8huTwlJQCZ016jof/cbN4VW5Yz0= gopkg.in/check.v1 v1.0.0-20200227125254-8fa46927fb4f h1:BLraFXnmrev5lT+xlilqcH8XK9/i0At2xKjWk4p6zsU= gopkg.in/check.v1 v1.0.0-20200227125254-8fa46927fb4f/go.mod h1:Co6ibVJAznAaIkqp8huTwlJQCZ016jof/cbN4VW5Yz0= gopkg.in/fsnotify.v1 v1.4.7/go.mod h1:Tz8NjZHkW78fSQdbUxIjBTcgA1z1m8ZHf0WmKUhAMys= -gopkg.in/inf.v0 v0.9.1/go.mod h1:cWUDdTG/fYaXco+Dcufb5Vnc6Gp2YChqWtbxRZE0mXw= gopkg.in/natefinch/lumberjack.v2 v2.0.0 h1:1Lc07Kr7qY4U2YPouBjpCLxpiyxIVoxqXgkXLknAOE8= gopkg.in/natefinch/lumberjack.v2 v2.0.0/go.mod h1:l0ndWWf7gzL7RNwBG7wST/UCcT4T24xpD6X8LsfU/+k= gopkg.in/tomb.v1 v1.0.0-20141024135613-dd632973f1e7 h1:uRGJdciOHaEIrze2W8Q3AKkepLTh2hOroT7a+7czfdQ= gopkg.in/tomb.v1 v1.0.0-20141024135613-dd632973f1e7/go.mod h1:dt/ZhP58zS4L8KSrWDmTeBkI65Dw0HsyUHuEVlX15mw= gopkg.in/yaml.v1 v1.0.0-20140924161607-9f9df34309c0/go.mod h1:WDnlLJ4WF5VGsH/HVa3CI79GS0ol3YnhVnKP89i0kNg= -gopkg.in/yaml.v2 v2.2.1/go.mod h1:hI93XBmqTisBFMUTm0b8Fm+jr3Dg1NNxqwp+5A1VGuI= gopkg.in/yaml.v2 v2.2.2/go.mod h1:hI93XBmqTisBFMUTm0b8Fm+jr3Dg1NNxqwp+5A1VGuI= gopkg.in/yaml.v2 v2.2.4/go.mod h1:hI93XBmqTisBFMUTm0b8Fm+jr3Dg1NNxqwp+5A1VGuI= gopkg.in/yaml.v2 v2.2.8/go.mod h1:hI93XBmqTisBFMUTm0b8Fm+jr3Dg1NNxqwp+5A1VGuI= gopkg.in/yaml.v2 v2.3.0/go.mod h1:hI93XBmqTisBFMUTm0b8Fm+jr3Dg1NNxqwp+5A1VGuI= gopkg.in/yaml.v2 v2.4.0 h1:D8xgwECY7CYvx+Y2n4sBz93Jn9JRvxdiyyo8CTfuKaY= -gopkg.in/yaml.v2 v2.4.0/go.mod h1:RDklbk79AGWmwhnvt/jBztapEOGDOx6ZbXqjP6csGnQ= gopkg.in/yaml.v3 v3.0.0-20200313102051-9f266ea9e77c/go.mod h1:K4uyk7z7BCEPqu6E+C64Yfv1cQ7kz7rIZviUmN+EgEM= gopkg.in/yaml.v3 v3.0.1 h1:fxVm/GzAzEWqLHuvctI91KS9hhNmmWOoWu0XTYJS7CA= gopkg.in/yaml.v3 v3.0.1/go.mod h1:K4uyk7z7BCEPqu6E+C64Yfv1cQ7kz7rIZviUmN+EgEM= -grpc.go4.org v0.0.0-20170609214715-11d0a25b4919/go.mod h1:77eQGdRu53HpSqPFJFmuJdjuHRquDANNeA4x7B8WQ9o= -honnef.co/go/tools v0.0.0-20180728063816-88497007e858/go.mod h1:rf3lG4BRIbNafJWhAfAdb/ePZxsR/4RtNHQocxwk9r4= -honnef.co/go/tools v0.0.0-20190102054323-c2f93a96b099/go.mod h1:rf3lG4BRIbNafJWhAfAdb/ePZxsR/4RtNHQocxwk9r4= -honnef.co/go/tools v0.0.0-20190106161140-3f1c8253044a/go.mod h1:rf3lG4BRIbNafJWhAfAdb/ePZxsR/4RtNHQocxwk9r4= howett.net/plist v1.0.0 h1:7CrbWYbPPO/PyNy38b2EB/+gYbjCe2DXBxgtOOZbSQM= howett.net/plist v1.0.0/go.mod h1:lqaXoTrLY4hg8tnEzNru53gicrbv7rrk+2xJA/7hw9g= -sourcegraph.com/sourcegraph/go-diff v0.5.0/go.mod h1:kuch7UrkMzY0X+p9CRK03kfuPQ2zzQcaEFbx8wA8rck= -sourcegraph.com/sqs/pbtypes v0.0.0-20180604144634-d3ebe8f20ae4/go.mod h1:ketZ/q3QxT9HOBeFhu6RdvsftgpsbFHBF5Cas6cDKZ0= diff --git a/internal/dnsforward/dns.go b/internal/dnsforward/dns.go index f3c98361..fe4f1b31 100644 --- a/internal/dnsforward/dns.go +++ b/internal/dnsforward/dns.go @@ -81,9 +81,9 @@ const ( const ddrHostFQDN = "_dns.resolver.arpa." // handleDNSRequest filters the incoming DNS requests and writes them to the query log -func (s *Server) handleDNSRequest(_ *proxy.Proxy, d *proxy.DNSContext) error { - ctx := &dnsContext{ - proxyCtx: d, +func (s *Server) handleDNSRequest(_ *proxy.Proxy, pctx *proxy.DNSContext) error { + dctx := &dnsContext{ + proxyCtx: pctx, result: &filtering.Result{}, startTime: time.Now(), } @@ -111,7 +111,7 @@ func (s *Server) handleDNSRequest(_ *proxy.Proxy, d *proxy.DNSContext) error { s.processQueryLogsAndStats, } for _, process := range mods { - r := process(ctx) + r := process(dctx) switch r { case resultCodeSuccess: // continue: call the next filter @@ -120,13 +120,15 @@ func (s *Server) handleDNSRequest(_ *proxy.Proxy, d *proxy.DNSContext) error { return nil case resultCodeError: - return ctx.err + return dctx.err } } - if d.Res != nil { - d.Res.Compress = true // some devices require DNS message compression + if pctx.Res != nil { + // Some devices require DNS message compression. + pctx.Res.Compress = true } + return nil } @@ -149,34 +151,38 @@ func (s *Server) processRecursion(dctx *dnsContext) (rc resultCode) { // needed and enriches the ctx with some client-specific information. // // TODO(e.burkov): Decompose into less general processors. -func (s *Server) processInitial(ctx *dnsContext) (rc resultCode) { - d := ctx.proxyCtx - if s.conf.AAAADisabled && d.Req.Question[0].Qtype == dns.TypeAAAA { - _ = proxy.CheckDisabledAAAARequest(d, true) +func (s *Server) processInitial(dctx *dnsContext) (rc resultCode) { + pctx := dctx.proxyCtx + q := pctx.Req.Question[0] + qt := q.Qtype + if s.conf.AAAADisabled && qt == dns.TypeAAAA { + _ = proxy.CheckDisabledAAAARequest(pctx, true) + return resultCodeFinish } if s.conf.OnDNSRequest != nil { - s.conf.OnDNSRequest(d) + s.conf.OnDNSRequest(pctx) } - // disable Mozilla DoH - // https://support.mozilla.org/en-US/kb/canary-domain-use-application-dnsnet - if (d.Req.Question[0].Qtype == dns.TypeA || d.Req.Question[0].Qtype == dns.TypeAAAA) && - d.Req.Question[0].Name == "use-application-dns.net." { - d.Res = s.genNXDomain(d.Req) + // Disable Mozilla DoH. + // + // See https://support.mozilla.org/en-US/kb/canary-domain-use-application-dnsnet. + if (qt == dns.TypeA || qt == dns.TypeAAAA) && q.Name == "use-application-dns.net." { + pctx.Res = s.genNXDomain(pctx.Req) + return resultCodeFinish } - // Get the client's ID if any. It should be performed before getting - // client-specific filtering settings. + // Get the ClientID, if any, before getting client-specific filtering + // settings. var key [8]byte - binary.BigEndian.PutUint64(key[:], d.RequestID) - ctx.clientID = string(s.clientIDCache.Get(key[:])) + binary.BigEndian.PutUint64(key[:], pctx.RequestID) + dctx.clientID = string(s.clientIDCache.Get(key[:])) // Get the client-specific filtering settings. - ctx.protectionEnabled = s.conf.ProtectionEnabled - ctx.setts = s.getClientRequestFilteringSettings(ctx) + dctx.protectionEnabled = s.conf.ProtectionEnabled + dctx.setts = s.getClientRequestFilteringSettings(dctx) return resultCodeSuccess } @@ -249,23 +255,23 @@ func (s *Server) onDHCPLeaseChanged(flags int) { // supported by current user configuration. // // See https://www.ietf.org/archive/id/draft-ietf-add-ddr-06.html. -func (s *Server) processDDRQuery(ctx *dnsContext) (rc resultCode) { - d := ctx.proxyCtx - question := d.Req.Question[0] +func (s *Server) processDDRQuery(dctx *dnsContext) (rc resultCode) { + pctx := dctx.proxyCtx + q := pctx.Req.Question[0] if !s.conf.HandleDDR { return resultCodeSuccess } - if question.Name == ddrHostFQDN { + if q.Name == ddrHostFQDN { if s.dnsProxy.TLSListenAddr == nil && s.conf.HTTPSListenAddrs == nil && - s.dnsProxy.QUICListenAddr == nil || question.Qtype != dns.TypeSVCB { - d.Res = s.makeResponse(d.Req) + s.dnsProxy.QUICListenAddr == nil || q.Qtype != dns.TypeSVCB { + pctx.Res = s.makeResponse(pctx.Req) return resultCodeFinish } - d.Res = s.makeDDRResponse(d.Req) + pctx.Res = s.makeDDRResponse(pctx.Req) return resultCodeFinish } @@ -400,10 +406,10 @@ func (s *Server) processDHCPHosts(dctx *dnsContext) (rc resultCode) { return resultCodeSuccess } - d := dctx.proxyCtx + pctx := dctx.proxyCtx if !dctx.isLocalClient { - log.Debug("dns: %q requests for internal host", d.Addr) - d.Res = s.genNXDomain(req) + log.Debug("dns: %q requests for internal host", pctx.Addr) + pctx.Res = s.genNXDomain(req) // Do not even put into query log. return resultCodeFinish @@ -413,7 +419,7 @@ func (s *Server) processDHCPHosts(dctx *dnsContext) (rc resultCode) { if !ok { // TODO(e.burkov): Inspect special cases when user want to apply some // rules handled by other processors to the hosts with TLD. - d.Res = s.genNXDomain(req) + pctx.Res = s.genNXDomain(req) return resultCodeFinish } @@ -435,9 +441,9 @@ func (s *Server) processDHCPHosts(dctx *dnsContext) (rc resultCode) { // processRestrictLocal responds with NXDOMAIN to PTR requests for IP addresses // in locally-served network from external clients. -func (s *Server) processRestrictLocal(ctx *dnsContext) (rc resultCode) { - d := ctx.proxyCtx - req := d.Req +func (s *Server) processRestrictLocal(dctx *dnsContext) (rc resultCode) { + pctx := dctx.proxyCtx + req := pctx.Req q := req.Question[0] if q.Qtype != dns.TypePTR { // No need for restriction. @@ -473,24 +479,24 @@ func (s *Server) processRestrictLocal(ctx *dnsContext) (rc resultCode) { return resultCodeSuccess } - if !ctx.isLocalClient { - log.Debug("dns: %q requests an internal ip", d.Addr) - d.Res = s.genNXDomain(req) + if !dctx.isLocalClient { + log.Debug("dns: %q requests an internal ip", pctx.Addr) + pctx.Res = s.genNXDomain(req) // Do not even put into query log. return resultCodeFinish } // Do not perform unreversing ever again. - ctx.unreversedReqIP = ip + dctx.unreversedReqIP = ip // There is no need to filter request from external addresses since this // code is only executed when the request is for locally-served ARPA // hostname so disable redundant filters. - ctx.setts.ParentalEnabled = false - ctx.setts.SafeBrowsingEnabled = false - ctx.setts.SafeSearchEnabled = false - ctx.setts.ServicesRules = nil + dctx.setts.ParentalEnabled = false + dctx.setts.SafeBrowsingEnabled = false + dctx.setts.SafeSearchEnabled = false + dctx.setts.ServicesRules = nil // Nothing to restrict. return resultCodeSuccess @@ -523,13 +529,13 @@ func (s *Server) ipToHost(ip net.IP) (host string, ok bool) { // Respond to PTR requests if the target IP is leased by our DHCP server and the // requestor is inside the local network. -func (s *Server) processDHCPAddrs(ctx *dnsContext) (rc resultCode) { - d := ctx.proxyCtx - if d.Res != nil { +func (s *Server) processDHCPAddrs(dctx *dnsContext) (rc resultCode) { + pctx := dctx.proxyCtx + if pctx.Res != nil { return resultCodeSuccess } - ip := ctx.unreversedReqIP + ip := dctx.unreversedReqIP if ip == nil { return resultCodeSuccess } @@ -541,7 +547,7 @@ func (s *Server) processDHCPAddrs(ctx *dnsContext) (rc resultCode) { log.Debug("dns: reverse-lookup: %s -> %s", ip, host) - req := d.Req + req := pctx.Req resp := s.makeResponse(req) ptr := &dns.PTR{ Hdr: dns.RR_Header{ @@ -553,20 +559,20 @@ func (s *Server) processDHCPAddrs(ctx *dnsContext) (rc resultCode) { Ptr: dns.Fqdn(host), } resp.Answer = append(resp.Answer, ptr) - d.Res = resp + pctx.Res = resp return resultCodeSuccess } // processLocalPTR responds to PTR requests if the target IP is detected to be // inside the local network and the query was not answered from DHCP. -func (s *Server) processLocalPTR(ctx *dnsContext) (rc resultCode) { - d := ctx.proxyCtx - if d.Res != nil { +func (s *Server) processLocalPTR(dctx *dnsContext) (rc resultCode) { + pctx := dctx.proxyCtx + if pctx.Res != nil { return resultCodeSuccess } - ip := ctx.unreversedReqIP + ip := dctx.unreversedReqIP if ip == nil { return resultCodeSuccess } @@ -579,16 +585,16 @@ func (s *Server) processLocalPTR(ctx *dnsContext) (rc resultCode) { } if s.conf.UsePrivateRDNS { - s.recDetector.add(*d.Req) - if err := s.localResolvers.Resolve(d); err != nil { - ctx.err = err + s.recDetector.add(*pctx.Req) + if err := s.localResolvers.Resolve(pctx); err != nil { + dctx.err = err return resultCodeError } } - if d.Res == nil { - d.Res = s.genNXDomain(d.Req) + if pctx.Res == nil { + pctx.Res = s.genNXDomain(pctx.Req) // Do not even put into query log. return resultCodeFinish @@ -638,17 +644,7 @@ func (s *Server) processUpstream(dctx *dnsContext) (rc resultCode) { return resultCodeSuccess } - if pctx.Addr != nil && s.conf.GetCustomUpstreamByClient != nil { - // Use the ClientID first, since it has a higher priority. - id := stringutil.Coalesce(dctx.clientID, ipStringFromAddr(pctx.Addr)) - upsConf, err := s.conf.GetCustomUpstreamByClient(id) - if err != nil { - log.Error("dns: getting custom upstreams for client %s: %s", id, err) - } else if upsConf != nil { - log.Debug("dns: using custom upstreams for client %s", id) - pctx.CustomUpstreamConfig = upsConf - } - } + s.setCustomUpstream(pctx, dctx.clientID) req := pctx.Req origReqAD := false @@ -683,52 +679,78 @@ func (s *Server) processUpstream(dctx *dnsContext) (rc resultCode) { return resultCodeSuccess } -// Apply filtering logic after we have received response from upstream servers -func (s *Server) processFilteringAfterResponse(ctx *dnsContext) (rc resultCode) { - d := ctx.proxyCtx +// setCustomUpstream sets custom upstream settings in pctx, if necessary. +func (s *Server) setCustomUpstream(pctx *proxy.DNSContext, clientID string) { + customUpsByClient := s.conf.GetCustomUpstreamByClient + if pctx.Addr == nil || customUpsByClient == nil { + return + } - switch res := ctx.result; res.Reason { + // Use the ClientID first, since it has a higher priority. + id := stringutil.Coalesce(clientID, ipStringFromAddr(pctx.Addr)) + upsConf, err := customUpsByClient(id) + if err != nil { + log.Error("dns: getting custom upstreams for client %s: %s", id, err) + + return + } + + if upsConf != nil { + log.Debug("dns: using custom upstreams for client %s", id) + } + + pctx.CustomUpstreamConfig = upsConf +} + +// Apply filtering logic after we have received response from upstream servers +func (s *Server) processFilteringAfterResponse(dctx *dnsContext) (rc resultCode) { + pctx := dctx.proxyCtx + switch res := dctx.result; res.Reason { case filtering.NotFilteredAllowList: - // Go on. + return resultCodeSuccess case filtering.Rewritten, filtering.RewrittenRule: - if len(ctx.origQuestion.Name) == 0 { + if dctx.origQuestion.Name == "" { // origQuestion is set in case we get only CNAME without IP from // rewrites table. - break + return resultCodeSuccess } - d.Req.Question[0], d.Res.Question[0] = ctx.origQuestion, ctx.origQuestion - if len(d.Res.Answer) > 0 { - answer := append([]dns.RR{s.genAnswerCNAME(d.Req, res.CanonName)}, d.Res.Answer...) - d.Res.Answer = answer + pctx.Req.Question[0], pctx.Res.Question[0] = dctx.origQuestion, dctx.origQuestion + if len(pctx.Res.Answer) > 0 { + rr := s.genAnswerCNAME(pctx.Req, res.CanonName) + answer := append([]dns.RR{rr}, pctx.Res.Answer...) + pctx.Res.Answer = answer } + + return resultCodeSuccess default: - // Check the response only if it's from an upstream. Don't check the - // response if the protection is disabled since dnsrewrite rules aren't - // applied to it anyway. - if !ctx.protectionEnabled || !ctx.responseFromUpstream || s.dnsFilter == nil { - break - } + return s.filterAfterResponse(dctx, pctx) + } +} - origResp := d.Res - result, err := s.filterDNSResponse(ctx) - if err != nil { - ctx.err = err - - return resultCodeError - } - - if result != nil { - ctx.result = result - ctx.origResp = origResp - } +// filterAfterResponse returns the result of filtering the response that wasn't +// explicitly allowed or rewritten. +func (s *Server) filterAfterResponse(dctx *dnsContext, pctx *proxy.DNSContext) (res resultCode) { + // Check the response only if it's from an upstream. Don't check the + // response if the protection is disabled since dnsrewrite rules aren't + // applied to it anyway. + if !dctx.protectionEnabled || !dctx.responseFromUpstream || s.dnsFilter == nil { + return resultCodeSuccess } - if ctx.result == nil { - ctx.result = &filtering.Result{} + result, err := s.filterDNSResponse(pctx, dctx.setts) + if err != nil { + dctx.err = err + + return resultCodeError + } + + if result != nil { + dctx.result = result + dctx.origResp = pctx.Res } return resultCodeSuccess diff --git a/internal/dnsforward/dnsrewrite.go b/internal/dnsforward/dnsrewrite.go index 2d4cc5a7..347dfa6b 100644 --- a/internal/dnsforward/dnsrewrite.go +++ b/internal/dnsforward/dnsrewrite.go @@ -12,12 +12,16 @@ import ( "github.com/miekg/dns" ) -// filterDNSRewriteResponse handles a single DNS rewrite response entry. -// It returns the properly constructed answer resource record. -func (s *Server) filterDNSRewriteResponse(req *dns.Msg, rr rules.RRType, v rules.RRValue) (ans dns.RR, err error) { - // TODO(a.garipov): As more types are added, we will probably want to - // use a handler-oriented approach here. So, think of a way to decouple - // the answer generation logic from the Server. +// filterDNSRewriteResponse handles a single DNS rewrite response entry. It +// returns the properly constructed answer resource record. +func (s *Server) filterDNSRewriteResponse( + req *dns.Msg, + rr rules.RRType, + v rules.RRValue, +) (ans dns.RR, err error) { + // TODO(a.garipov): As more types are added, we will probably want to use a + // handler-oriented approach here. So, think of a way to decouple the + // answer generation logic from the Server. switch rr { case dns.TypeA, @@ -77,9 +81,13 @@ func (s *Server) filterDNSRewriteResponse(req *dns.Msg, rr rules.RRType, v rules } } -// filterDNSRewrite handles dnsrewrite filters. It constructs a DNS -// response and sets it into d.Res. -func (s *Server) filterDNSRewrite(req *dns.Msg, res filtering.Result, d *proxy.DNSContext) (err error) { +// filterDNSRewrite handles dnsrewrite filters. It constructs a DNS response +// and sets it into pctx.Res. All parameters must not be nil. +func (s *Server) filterDNSRewrite( + req *dns.Msg, + res *filtering.Result, + pctx *proxy.DNSContext, +) (err error) { resp := s.makeResponse(req) dnsrr := res.DNSRewriteResult if dnsrr == nil { @@ -88,7 +96,7 @@ func (s *Server) filterDNSRewrite(req *dns.Msg, res filtering.Result, d *proxy.D resp.Rcode = dnsrr.RCode if resp.Rcode != dns.RcodeSuccess { - d.Res = resp + pctx.Res = resp return nil } @@ -109,7 +117,7 @@ func (s *Server) filterDNSRewrite(req *dns.Msg, res filtering.Result, d *proxy.D resp.Answer = append(resp.Answer, ans) } - d.Res = resp + pctx.Res = resp return nil } diff --git a/internal/dnsforward/dnsrewrite_test.go b/internal/dnsforward/dnsrewrite_test.go index 5ba10582..422759a3 100644 --- a/internal/dnsforward/dnsrewrite_test.go +++ b/internal/dnsforward/dnsrewrite_test.go @@ -42,11 +42,11 @@ func TestServer_FilterDNSRewrite(t *testing.T) { }}, } } - makeRes := func(rcode rules.RCode, rr rules.RRType, v rules.RRValue) (res filtering.Result) { + makeRes := func(rcode rules.RCode, rr rules.RRType, v rules.RRValue) (res *filtering.Result) { resp := filtering.DNSRewriteResultResponse{ rr: []rules.RRValue{v}, } - return filtering.Result{ + return &filtering.Result{ DNSRewriteResult: &filtering.DNSRewriteResult{ RCode: rcode, Response: resp, diff --git a/internal/dnsforward/filter.go b/internal/dnsforward/filter.go index 18f12797..7dc8514e 100644 --- a/internal/dnsforward/filter.go +++ b/internal/dnsforward/filter.go @@ -49,69 +49,83 @@ func (s *Server) beforeRequestHandler( } // getClientRequestFilteringSettings looks up client filtering settings using -// the client's IP address and ID, if any, from ctx. -func (s *Server) getClientRequestFilteringSettings(ctx *dnsContext) *filtering.Settings { +// the client's IP address and ID, if any, from dctx. +func (s *Server) getClientRequestFilteringSettings(dctx *dnsContext) *filtering.Settings { setts := s.dnsFilter.GetConfig() - setts.ProtectionEnabled = ctx.protectionEnabled + setts.ProtectionEnabled = dctx.protectionEnabled if s.conf.FilterHandler != nil { - ip, _ := netutil.IPAndPortFromAddr(ctx.proxyCtx.Addr) - s.conf.FilterHandler(ip, ctx.clientID, &setts) + ip, _ := netutil.IPAndPortFromAddr(dctx.proxyCtx.Addr) + s.conf.FilterHandler(ip, dctx.clientID, &setts) } return &setts } -// filterDNSRequest applies the dnsFilter and sets d.Res if the request was -// filtered. -func (s *Server) filterDNSRequest(ctx *dnsContext) (*filtering.Result, error) { - d := ctx.proxyCtx - req := d.Req +// filterDNSRequest applies the dnsFilter and sets dctx.proxyCtx.Res if the +// request was filtered. +func (s *Server) filterDNSRequest(dctx *dnsContext) (res *filtering.Result, err error) { + pctx := dctx.proxyCtx + req := pctx.Req q := req.Question[0] host := strings.TrimSuffix(q.Name, ".") - res, err := s.dnsFilter.CheckHost(host, q.Qtype, ctx.setts) + resVal, err := s.dnsFilter.CheckHost(host, q.Qtype, dctx.setts) + if err != nil { + return nil, fmt.Errorf("checking host %q: %w", host, err) + } + + // TODO(a.garipov): Make CheckHost return a pointer. + res = &resVal switch { - case err != nil: - return nil, fmt.Errorf("failed to check host %q: %w", host, err) case res.IsFiltered: log.Tracef("host %q is filtered, reason %q, rule: %q", host, res.Reason, res.Rules[0].Text) - d.Res = s.genDNSFilterMessage(d, &res) + pctx.Res = s.genDNSFilterMessage(pctx, res) case res.Reason.In(filtering.Rewritten, filtering.RewrittenRule) && res.CanonName != "" && len(res.IPList) == 0: // Resolve the new canonical name, not the original host name. The // original question is readded in processFilteringAfterResponse. - ctx.origQuestion = q + dctx.origQuestion = q req.Question[0].Name = dns.Fqdn(res.CanonName) case res.Reason == filtering.Rewritten: - resp := s.makeResponse(req) - - name := host - if len(res.CanonName) != 0 { - resp.Answer = append(resp.Answer, s.genAnswerCNAME(req, res.CanonName)) - name = res.CanonName - } - - for _, ip := range res.IPList { - switch q.Qtype { - case dns.TypeA: - a := s.genAnswerA(req, ip.To4()) - a.Hdr.Name = dns.Fqdn(name) - resp.Answer = append(resp.Answer, a) - case dns.TypeAAAA: - a := s.genAnswerAAAA(req, ip) - a.Hdr.Name = dns.Fqdn(name) - resp.Answer = append(resp.Answer, a) - } - } - - d.Res = resp + pctx.Res = s.filterRewritten(req, host, res, q.Qtype) case res.Reason.In(filtering.RewrittenRule, filtering.RewrittenAutoHosts): - if err = s.filterDNSRewrite(req, res, d); err != nil { + if err = s.filterDNSRewrite(req, res, pctx); err != nil { return nil, err } } - return &res, err + return res, err +} + +// filterRewritten handles DNS rewrite filters. It returns a DNS response with +// the data from the filtering result. All parameters must not be nil. +func (s *Server) filterRewritten( + req *dns.Msg, + host string, + res *filtering.Result, + qt uint16, +) (resp *dns.Msg) { + resp = s.makeResponse(req) + name := host + if len(res.CanonName) != 0 { + resp.Answer = append(resp.Answer, s.genAnswerCNAME(req, res.CanonName)) + name = res.CanonName + } + + for _, ip := range res.IPList { + switch qt { + case dns.TypeA: + a := s.genAnswerA(req, ip.To4()) + a.Hdr.Name = dns.Fqdn(name) + resp.Answer = append(resp.Answer, a) + case dns.TypeAAAA: + a := s.genAnswerAAAA(req, ip) + a.Hdr.Name = dns.Fqdn(name) + resp.Answer = append(resp.Answer, a) + } + } + + return resp } // checkHostRules checks the host against filters. It is safe for concurrent @@ -137,16 +151,17 @@ func (s *Server) checkHostRules(host string, rrtype uint16, setts *filtering.Set } // filterDNSResponse checks each resource record of the response's answer -// section from ctx and returns a non-nil res if at least one of canonnical +// section from pctx and returns a non-nil res if at least one of canonnical // names or IP addresses in it matches the filtering rules. -func (s *Server) filterDNSResponse(ctx *dnsContext) (res *filtering.Result, err error) { - d := ctx.proxyCtx - setts := ctx.setts +func (s *Server) filterDNSResponse( + pctx *proxy.DNSContext, + setts *filtering.Settings, +) (res *filtering.Result, err error) { if !setts.FilteringEnabled { return nil, nil } - for _, a := range d.Res.Answer { + for _, a := range pctx.Res.Answer { host := "" var rrtype uint16 switch a := a.(type) { @@ -171,8 +186,8 @@ func (s *Server) filterDNSResponse(ctx *dnsContext) (res *filtering.Result, err } else if res == nil { continue } else if res.IsFiltered { - d.Res = s.genDNSFilterMessage(d, res) - log.Debug("DNSFwd: Matched %s by response: %s", d.Req.Question[0].Name, host) + pctx.Res = s.genDNSFilterMessage(pctx, res) + log.Debug("DNSFwd: Matched %s by response: %s", pctx.Req.Question[0].Name, host) return res, nil } diff --git a/internal/filtering/dnsrewrite.go b/internal/filtering/dnsrewrite.go index 5263f252..58a8dd7b 100644 --- a/internal/filtering/dnsrewrite.go +++ b/internal/filtering/dnsrewrite.go @@ -34,8 +34,8 @@ func (d *DNSFilter) processDNSRewrites(dnsr []*rules.NetworkRule) (res Result) { }} return Result{ - Reason: RewrittenRule, Rules: rules, + Reason: RewrittenRule, CanonName: dr.NewCNAME, } } @@ -60,16 +60,16 @@ func (d *DNSFilter) processDNSRewrites(dnsr []*rules.NetworkRule) (res Result) { } return Result{ - Reason: RewrittenRule, - Rules: rules, DNSRewriteResult: dnsrr, + Rules: rules, + Reason: RewrittenRule, } } } return Result{ - Reason: RewrittenRule, - Rules: rules, DNSRewriteResult: dnsrr, + Rules: rules, + Reason: RewrittenRule, } } diff --git a/internal/filtering/filtering.go b/internal/filtering/filtering.go index 4d438dfe..446ad4ac 100644 --- a/internal/filtering/filtering.go +++ b/internal/filtering/filtering.go @@ -390,18 +390,8 @@ type ResultRule struct { // TODO(a.garipov): Clarify relationships between fields. Perhaps // replace with a sum type or an interface? type Result struct { - // IsFiltered is true if the request is filtered. - IsFiltered bool `json:",omitempty"` - - // Reason is the reason for blocking or unblocking the request. - Reason Reason `json:",omitempty"` - - // Rules are applied rules. If Rules are not empty, each rule is not nil. - Rules []*ResultRule `json:",omitempty"` - - // IPList is the lookup rewrite result. It is empty unless Reason is set to - // Rewritten. - IPList []net.IP `json:",omitempty"` + // DNSRewriteResult is the $dnsrewrite filter rule result. + DNSRewriteResult *DNSRewriteResult `json:",omitempty"` // CanonName is the CNAME value from the lookup rewrite result. It is empty // unless Reason is set to Rewritten or RewrittenRule. @@ -411,8 +401,18 @@ type Result struct { // Reason is set to FilteredBlockedService. ServiceName string `json:",omitempty"` - // DNSRewriteResult is the $dnsrewrite filter rule result. - DNSRewriteResult *DNSRewriteResult `json:",omitempty"` + // IPList is the lookup rewrite result. It is empty unless Reason is set to + // Rewritten. + IPList []net.IP `json:",omitempty"` + + // Rules are applied rules. If Rules are not empty, each rule is not nil. + Rules []*ResultRule `json:",omitempty"` + + // Reason is the reason for blocking or unblocking the request. + Reason Reason `json:",omitempty"` + + // IsFiltered is true if the request is filtered. + IsFiltered bool `json:",omitempty"` } // Matched returns true if any match at all was found regardless of @@ -874,9 +874,9 @@ func makeResult(matchedRules []rules.Rule, reason Reason) (res Result) { } return Result{ - IsFiltered: reason == FilteredBlockList, - Reason: reason, Rules: resRules, + Reason: reason, + IsFiltered: reason == FilteredBlockList, } } diff --git a/internal/filtering/safebrowsing.go b/internal/filtering/safebrowsing.go index e49c4070..9d1d0fa4 100644 --- a/internal/filtering/safebrowsing.go +++ b/internal/filtering/safebrowsing.go @@ -325,12 +325,12 @@ func (d *DNSFilter) checkSafeBrowsing( } res = Result{ - IsFiltered: true, - Reason: FilteredSafeBrowsing, Rules: []*ResultRule{{ Text: "adguard-malware-shavar", FilterListID: SafeBrowsingListID, }}, + Reason: FilteredSafeBrowsing, + IsFiltered: true, } return check(sctx, res, d.safeBrowsingUpstream) @@ -359,12 +359,12 @@ func (d *DNSFilter) checkParental( } res = Result{ - IsFiltered: true, - Reason: FilteredParental, Rules: []*ResultRule{{ Text: "parental CATEGORY_BLACKLISTED", FilterListID: ParentalListID, }}, + Reason: FilteredParental, + IsFiltered: true, } return check(sctx, res, d.parentalUpstream) diff --git a/internal/filtering/safesearch.go b/internal/filtering/safesearch.go index 23751cb0..df2d2108 100644 --- a/internal/filtering/safesearch.go +++ b/internal/filtering/safesearch.go @@ -98,11 +98,11 @@ func (d *DNSFilter) checkSafeSearch( } res = Result{ - IsFiltered: true, - Reason: FilteredSafeSearch, Rules: []*ResultRule{{ FilterListID: SafeSearchListID, }}, + Reason: FilteredSafeSearch, + IsFiltered: true, } if ip := net.ParseIP(safeHost); ip != nil { diff --git a/internal/querylog/decode_test.go b/internal/querylog/decode_test.go index c5d45280..aa3de021 100644 --- a/internal/querylog/decode_test.go +++ b/internal/querylog/decode_test.go @@ -63,9 +63,15 @@ func TestDecodeLogEntry(t *testing.T) { Answer: ans, Cached: true, Result: filtering.Result{ - IsFiltered: true, - Reason: filtering.FilteredBlockList, - IPList: []net.IP{net.IPv4(127, 0, 0, 2)}, + DNSRewriteResult: &filtering.DNSRewriteResult{ + RCode: dns.RcodeSuccess, + Response: filtering.DNSRewriteResultResponse{ + dns.TypeA: []rules.RRValue{net.IPv4(127, 0, 0, 2)}, + }, + }, + CanonName: "example.com", + ServiceName: "example.org", + IPList: []net.IP{net.IPv4(127, 0, 0, 2)}, Rules: []*filtering.ResultRule{{ FilterListID: 42, Text: "||an.yandex.ru", @@ -75,14 +81,8 @@ func TestDecodeLogEntry(t *testing.T) { Text: "||an2.yandex.ru", IP: net.IPv4(127, 0, 0, 3), }}, - CanonName: "example.com", - ServiceName: "example.org", - DNSRewriteResult: &filtering.DNSRewriteResult{ - RCode: dns.RcodeSuccess, - Response: filtering.DNSRewriteResultResponse{ - dns.TypeA: []rules.RRValue{net.IPv4(127, 0, 0, 2)}, - }, - }, + Reason: filtering.FilteredBlockList, + IsFiltered: true, }, Upstream: "https://some.upstream", Elapsed: 837429, diff --git a/internal/querylog/qlog_test.go b/internal/querylog/qlog_test.go index 6beed1be..f33401cc 100644 --- a/internal/querylog/qlog_test.go +++ b/internal/querylog/qlog_test.go @@ -271,13 +271,13 @@ func addEntry(l *queryLog, host string, answerStr, client net.IP) { } res := filtering.Result{ - IsFiltered: true, - Reason: filtering.Rewritten, ServiceName: "SomeService", Rules: []*filtering.ResultRule{{ FilterListID: 1, Text: "SomeRule", }}, + Reason: filtering.Rewritten, + IsFiltered: true, } params := &AddParams{