Proxy: Use trust-dns-resolver for DNS. (#834)

trust-dns-resolver is a more complete implementation. In particular,
it supports CNAMES correctly, which is needed for PR #764. It also
supports /etc/hosts, which will help with issue #62.

Use the 0.8.2 pre-release since it hasn't been released yet. It was
created at our request.

Signed-off-by: Brian Smith <brian@briansmith.org>

Cargo.lock

@@ -1,14 +1,3 @@
-[[package]]
-name = "abstract-ns"
-version = "0.4.3"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-dependencies = [
- "futures 0.1.18 (registry+https://github.com/rust-lang/crates.io-index)",
- "quick-error 1.2.1 (registry+https://github.com/rust-lang/crates.io-index)",
- "rand 0.4.2 (registry+https://github.com/rust-lang/crates.io-index)",
- "void 1.0.2 (registry+https://github.com/rust-lang/crates.io-index)",
-]
-
 [[package]]
 name = "adler32"
 version = "1.0.2"
@@ -32,6 +21,20 @@ dependencies = [
  "winapi 0.3.4 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
+[[package]]
+name = "backtrace"
+version = "0.2.3"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+dependencies = [
+ "backtrace-sys 0.1.16 (registry+https://github.com/rust-lang/crates.io-index)",
+ "cfg-if 0.1.2 (registry+https://github.com/rust-lang/crates.io-index)",
+ "dbghelp-sys 0.2.0 (registry+https://github.com/rust-lang/crates.io-index)",
+ "kernel32-sys 0.2.2 (registry+https://github.com/rust-lang/crates.io-index)",
+ "libc 0.2.36 (registry+https://github.com/rust-lang/crates.io-index)",
+ "rustc-demangle 0.1.5 (registry+https://github.com/rust-lang/crates.io-index)",
+ "winapi 0.2.8 (registry+https://github.com/rust-lang/crates.io-index)",
+]
+
 [[package]]
 name = "backtrace"
 version = "0.3.5"
@@ -117,13 +120,11 @@ dependencies = [
 name = "conduit-proxy"
 version = "0.3.0"
 dependencies = [
- "abstract-ns 0.4.3 (registry+https://github.com/rust-lang/crates.io-index)",
  "bytes 0.4.6 (registry+https://github.com/rust-lang/crates.io-index)",
  "conduit-proxy-controller-grpc 0.3.0",
  "conduit-proxy-router 0.3.0",
  "convert 0.3.0",
  "deflate 0.7.18 (registry+https://github.com/rust-lang/crates.io-index)",
- "domain 0.2.3 (registry+https://github.com/rust-lang/crates.io-index)",
  "env_logger 0.5.3 (registry+https://github.com/rust-lang/crates.io-index)",
  "flate2 1.0.1 (registry+https://github.com/rust-lang/crates.io-index)",
  "futures 0.1.18 (registry+https://github.com/rust-lang/crates.io-index)",
@@ -137,7 +138,6 @@ dependencies = [
  "ipnet 1.0.0 (registry+https://github.com/rust-lang/crates.io-index)",
  "libc 0.2.36 (registry+https://github.com/rust-lang/crates.io-index)",
  "log 0.4.1 (registry+https://github.com/rust-lang/crates.io-index)",
- "ns-dns-tokio 0.4.0 (registry+https://github.com/rust-lang/crates.io-index)",
  "prost 0.3.2 (registry+https://github.com/rust-lang/crates.io-index)",
  "prost-types 0.3.2 (registry+https://github.com/rust-lang/crates.io-index)",
  "quickcheck 0.6.0 (registry+https://github.com/rust-lang/crates.io-index)",
@@ -156,6 +156,7 @@ dependencies = [
  "tower-in-flight-limit 0.1.0 (git+https://github.com/tower-rs/tower)",
  "tower-reconnect 0.1.0 (git+https://github.com/tower-rs/tower)",
  "tower-util 0.1.0 (git+https://github.com/tower-rs/tower)",
+ "trust-dns-resolver 0.8.2 (git+https://github.com/bluejekyll/trust-dns?branch=0.8_release)",
 ]
 
 [[package]]
@@ -197,6 +198,15 @@ dependencies = [
  "build_const 0.2.0 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
+[[package]]
+name = "dbghelp-sys"
+version = "0.2.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+dependencies = [
+ "winapi 0.2.8 (registry+https://github.com/rust-lang/crates.io-index)",
+ "winapi-build 0.1.1 (registry+https://github.com/rust-lang/crates.io-index)",
+]
+
 [[package]]
 name = "deflate"
 version = "0.7.18"
@@ -207,17 +217,6 @@ dependencies = [
  "gzip-header 0.1.2 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
-[[package]]
-name = "domain"
-version = "0.2.3"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-dependencies = [
- "byteorder 1.2.1 (registry+https://github.com/rust-lang/crates.io-index)",
- "futures 0.1.18 (registry+https://github.com/rust-lang/crates.io-index)",
- "rand 0.4.2 (registry+https://github.com/rust-lang/crates.io-index)",
- "tokio-core 0.1.12 (registry+https://github.com/rust-lang/crates.io-index)",
-]
-
 [[package]]
 name = "either"
 version = "1.4.0"
@@ -242,6 +241,22 @@ dependencies = [
  "termcolor 0.3.5 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
+[[package]]
+name = "error-chain"
+version = "0.1.12"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+dependencies = [
+ "backtrace 0.2.3 (registry+https://github.com/rust-lang/crates.io-index)",
+]
+
+[[package]]
+name = "error-chain"
+version = "0.8.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+dependencies = [
+ "backtrace 0.3.5 (registry+https://github.com/rust-lang/crates.io-index)",
+]
+
 [[package]]
 name = "failure"
 version = "0.1.1"
@@ -347,6 +362,15 @@ dependencies = [
  "unicode-segmentation 1.2.0 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
+[[package]]
+name = "hostname"
+version = "0.1.4"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+dependencies = [
+ "libc 0.2.36 (registry+https://github.com/rust-lang/crates.io-index)",
+ "winutil 0.1.1 (registry+https://github.com/rust-lang/crates.io-index)",
+]
+
 [[package]]
 name = "http"
 version = "0.1.5"
@@ -385,6 +409,16 @@ dependencies = [
  "unicase 2.1.0 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
+[[package]]
+name = "idna"
+version = "0.1.4"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+dependencies = [
+ "matches 0.1.6 (registry+https://github.com/rust-lang/crates.io-index)",
+ "unicode-bidi 0.3.4 (registry+https://github.com/rust-lang/crates.io-index)",
+ "unicode-normalization 0.1.5 (registry+https://github.com/rust-lang/crates.io-index)",
+]
+
 [[package]]
 name = "indexmap"
 version = "1.0.0"
@@ -399,6 +433,18 @@ dependencies = [
  "winapi 0.2.8 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
+[[package]]
+name = "ipconfig"
+version = "0.1.6"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+dependencies = [
+ "error-chain 0.8.1 (registry+https://github.com/rust-lang/crates.io-index)",
+ "socket2 0.3.1 (registry+https://github.com/rust-lang/crates.io-index)",
+ "widestring 0.2.2 (registry+https://github.com/rust-lang/crates.io-index)",
+ "winapi 0.3.4 (registry+https://github.com/rust-lang/crates.io-index)",
+ "winreg 0.5.0 (registry+https://github.com/rust-lang/crates.io-index)",
+]
+
 [[package]]
 name = "ipnet"
 version = "1.0.0"
@@ -441,6 +487,11 @@ name = "libc"
 version = "0.2.36"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 
+[[package]]
+name = "linked-hash-map"
+version = "0.4.2"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+
 [[package]]
 name = "log"
 version = "0.4.1"
@@ -449,6 +500,19 @@ dependencies = [
  "cfg-if 0.1.2 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
+[[package]]
+name = "lru-cache"
+version = "0.1.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+dependencies = [
+ "linked-hash-map 0.4.2 (registry+https://github.com/rust-lang/crates.io-index)",
+]
+
+[[package]]
+name = "matches"
+version = "0.1.6"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+
 [[package]]
 name = "memchr"
 version = "2.0.1"
@@ -540,17 +604,6 @@ dependencies = [
  "ws2_32-sys 0.2.1 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
-[[package]]
-name = "ns-dns-tokio"
-version = "0.4.0"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-dependencies = [
- "abstract-ns 0.4.3 (registry+https://github.com/rust-lang/crates.io-index)",
- "domain 0.2.3 (registry+https://github.com/rust-lang/crates.io-index)",
- "futures 0.1.18 (registry+https://github.com/rust-lang/crates.io-index)",
- "tokio-core 0.1.12 (registry+https://github.com/rust-lang/crates.io-index)",
-]
-
 [[package]]
 name = "num"
 version = "0.1.42"
@@ -748,6 +801,15 @@ dependencies = [
  "winapi 0.3.4 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
+[[package]]
+name = "resolv-conf"
+version = "0.6.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+dependencies = [
+ "hostname 0.1.4 (registry+https://github.com/rust-lang/crates.io-index)",
+ "quick-error 1.2.1 (registry+https://github.com/rust-lang/crates.io-index)",
+]
+
 [[package]]
 name = "rustc-demangle"
 version = "0.1.5"
@@ -768,6 +830,16 @@ name = "slab"
 version = "0.4.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 
+[[package]]
+name = "socket2"
+version = "0.3.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+dependencies = [
+ "cfg-if 0.1.2 (registry+https://github.com/rust-lang/crates.io-index)",
+ "libc 0.2.36 (registry+https://github.com/rust-lang/crates.io-index)",
+ "winapi 0.3.4 (registry+https://github.com/rust-lang/crates.io-index)",
+]
+
 [[package]]
 name = "string"
 version = "0.1.0"
@@ -1005,6 +1077,39 @@ dependencies = [
  "tower-ready-service 0.1.0 (git+https://github.com/tower-rs/tower)",
 ]
 
+[[package]]
+name = "trust-dns-proto"
+version = "0.3.3"
+source = "git+https://github.com/bluejekyll/trust-dns?branch=0.8_release#ce6952c9ba5a41fb0b7c5f90cf1870a5e8029e2d"
+dependencies = [
+ "byteorder 1.2.1 (registry+https://github.com/rust-lang/crates.io-index)",
+ "error-chain 0.1.12 (registry+https://github.com/rust-lang/crates.io-index)",
+ "futures 0.1.18 (registry+https://github.com/rust-lang/crates.io-index)",
+ "idna 0.1.4 (registry+https://github.com/rust-lang/crates.io-index)",
+ "lazy_static 1.0.0 (registry+https://github.com/rust-lang/crates.io-index)",
+ "log 0.4.1 (registry+https://github.com/rust-lang/crates.io-index)",
+ "rand 0.4.2 (registry+https://github.com/rust-lang/crates.io-index)",
+ "tokio-core 0.1.12 (registry+https://github.com/rust-lang/crates.io-index)",
+ "tokio-io 0.1.5 (registry+https://github.com/rust-lang/crates.io-index)",
+ "url 1.7.0 (registry+https://github.com/rust-lang/crates.io-index)",
+]
+
+[[package]]
+name = "trust-dns-resolver"
+version = "0.8.2"
+source = "git+https://github.com/bluejekyll/trust-dns?branch=0.8_release#ce6952c9ba5a41fb0b7c5f90cf1870a5e8029e2d"
+dependencies = [
+ "error-chain 0.1.12 (registry+https://github.com/rust-lang/crates.io-index)",
+ "futures 0.1.18 (registry+https://github.com/rust-lang/crates.io-index)",
+ "ipconfig 0.1.6 (registry+https://github.com/rust-lang/crates.io-index)",
+ "lazy_static 1.0.0 (registry+https://github.com/rust-lang/crates.io-index)",
+ "log 0.4.1 (registry+https://github.com/rust-lang/crates.io-index)",
+ "lru-cache 0.1.1 (registry+https://github.com/rust-lang/crates.io-index)",
+ "resolv-conf 0.6.0 (registry+https://github.com/rust-lang/crates.io-index)",
+ "tokio-core 0.1.12 (registry+https://github.com/rust-lang/crates.io-index)",
+ "trust-dns-proto 0.3.3 (git+https://github.com/bluejekyll/trust-dns?branch=0.8_release)",
+]
+
 [[package]]
 name = "ucd-util"
 version = "0.1.1"
@@ -1018,6 +1123,19 @@ dependencies = [
  "version_check 0.1.3 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
+[[package]]
+name = "unicode-bidi"
+version = "0.3.4"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+dependencies = [
+ "matches 0.1.6 (registry+https://github.com/rust-lang/crates.io-index)",
+]
+
+[[package]]
+name = "unicode-normalization"
+version = "0.1.5"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+
 [[package]]
 name = "unicode-segmentation"
 version = "1.2.0"
@@ -1036,6 +1154,16 @@ dependencies = [
  "void 1.0.2 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
+[[package]]
+name = "url"
+version = "1.7.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+dependencies = [
+ "idna 0.1.4 (registry+https://github.com/rust-lang/crates.io-index)",
+ "matches 0.1.6 (registry+https://github.com/rust-lang/crates.io-index)",
+ "percent-encoding 1.0.1 (registry+https://github.com/rust-lang/crates.io-index)",
+]
+
 [[package]]
 name = "utf8-ranges"
 version = "1.0.0"
@@ -1051,6 +1179,11 @@ name = "void"
 version = "1.0.2"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 
+[[package]]
+name = "widestring"
+version = "0.2.2"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+
 [[package]]
 name = "winapi"
 version = "0.2.8"
@@ -1088,6 +1221,22 @@ dependencies = [
  "winapi 0.3.4 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
+[[package]]
+name = "winreg"
+version = "0.5.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+dependencies = [
+ "winapi 0.3.4 (registry+https://github.com/rust-lang/crates.io-index)",
+]
+
+[[package]]
+name = "winutil"
+version = "0.1.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+dependencies = [
+ "winapi 0.3.4 (registry+https://github.com/rust-lang/crates.io-index)",
+]
+
 [[package]]
 name = "ws2_32-sys"
 version = "0.2.1"
@@ -1098,10 +1247,10 @@ dependencies = [
 ]
 
 [metadata]
-"checksum abstract-ns 0.4.3 (registry+https://github.com/rust-lang/crates.io-index)" = "8964f1b6e32687dfe6377ca7dd801b2646a01dfcdb44a25b521d4af29faaa38c"
 "checksum adler32 1.0.2 (registry+https://github.com/rust-lang/crates.io-index)" = "6cbd0b9af8587c72beadc9f72d35b9fbb070982c9e6203e46e93f10df25f8f45"
 "checksum aho-corasick 0.6.4 (registry+https://github.com/rust-lang/crates.io-index)" = "d6531d44de723825aa81398a6415283229725a00fa30713812ab9323faa82fc4"
 "checksum atty 0.2.6 (registry+https://github.com/rust-lang/crates.io-index)" = "8352656fd42c30a0c3c89d26dea01e3b77c0ab2af18230835c15e2e13cd51859"
+"checksum backtrace 0.2.3 (registry+https://github.com/rust-lang/crates.io-index)" = "346d7644f0b5f9bc73082d3b2236b69a05fd35cce0cfa3724e184e6a5c9e2a2f"
 "checksum backtrace 0.3.5 (registry+https://github.com/rust-lang/crates.io-index)" = "ebbbf59b1c43eefa8c3ede390fcc36820b4999f7914104015be25025e0d62af2"
 "checksum backtrace-sys 0.1.16 (registry+https://github.com/rust-lang/crates.io-index)" = "44585761d6161b0f57afc49482ab6bd067e4edef48c12a152c237eb0203f7661"
 "checksum base64 0.9.0 (registry+https://github.com/rust-lang/crates.io-index)" = "229d032f1a99302697f10b27167ae6d03d49d032e6a8e2550e8d3fc13356d2b4"
@@ -1114,11 +1263,13 @@ dependencies = [
 "checksum chrono 0.4.0 (registry+https://github.com/rust-lang/crates.io-index)" = "7c20ebe0b2b08b0aeddba49c609fe7957ba2e33449882cb186a180bc60682fa9"
 "checksum codegen 0.1.0 (git+https://github.com/carllerche/codegen)" = "<none>"
 "checksum crc 1.7.0 (registry+https://github.com/rust-lang/crates.io-index)" = "bd5d02c0aac6bd68393ed69e00bbc2457f3e89075c6349db7189618dc4ddc1d7"
+"checksum dbghelp-sys 0.2.0 (registry+https://github.com/rust-lang/crates.io-index)" = "97590ba53bcb8ac28279161ca943a924d1fd4a8fb3fa63302591647c4fc5b850"
 "checksum deflate 0.7.18 (registry+https://github.com/rust-lang/crates.io-index)" = "32c8120d981901a9970a3a1c97cf8b630e0fa8c3ca31e75b6fd6fd5f9f427b31"
-"checksum domain 0.2.3 (registry+https://github.com/rust-lang/crates.io-index)" = "ed223144c5eaf3fc1406b4ccc7f360564218df8eec11cbfa03282d405a751f64"
 "checksum either 1.4.0 (registry+https://github.com/rust-lang/crates.io-index)" = "740178ddf48b1a9e878e6d6509a1442a2d42fd2928aae8e7a6f8a36fb01981b3"
 "checksum enum_primitive 0.1.1 (registry+https://github.com/rust-lang/crates.io-index)" = "be4551092f4d519593039259a9ed8daedf0da12e5109c5280338073eaeb81180"
 "checksum env_logger 0.5.3 (registry+https://github.com/rust-lang/crates.io-index)" = "f15f0b172cb4f52ed5dbf47f774a387cd2315d1bf7894ab5af9b083ae27efa5a"
+"checksum error-chain 0.1.12 (registry+https://github.com/rust-lang/crates.io-index)" = "faa976b4fd2e4c2b2f3f486874b19e61944d3de3de8b61c9fcf835d583871bcc"
+"checksum error-chain 0.8.1 (registry+https://github.com/rust-lang/crates.io-index)" = "6930e04918388a9a2e41d518c25cf679ccafe26733fb4127dbf21993f2575d46"
 "checksum failure 0.1.1 (registry+https://github.com/rust-lang/crates.io-index)" = "934799b6c1de475a012a02dab0ace1ace43789ee4b99bcfbf1a2e3e8ced5de82"
 "checksum fixedbitset 0.1.8 (registry+https://github.com/rust-lang/crates.io-index)" = "85cb8fec437468d86dc7c83ca7cfc933341d561873275f22dd5eedefa63a6478"
 "checksum flate2 1.0.1 (registry+https://github.com/rust-lang/crates.io-index)" = "9fac2277e84e5e858483756647a9d0aa8d9a2b7cba517fd84325a0aaa69a0909"
@@ -1131,11 +1282,14 @@ dependencies = [
 "checksum gzip-header 0.1.2 (registry+https://github.com/rust-lang/crates.io-index)" = "0a9fcfe1c9ee125342355b2467bc29b9dfcb2124fcae27edb9cee6f4cc5ecd40"
 "checksum h2 0.1.6 (registry+https://github.com/rust-lang/crates.io-index)" = "c91a0ee01fcf961ae004d88f1a77fc47dc5db6164f7d57605cc9f2c93d535686"
 "checksum heck 0.3.0 (registry+https://github.com/rust-lang/crates.io-index)" = "ea04fa3ead4e05e51a7c806fc07271fdbde4e246a6c6d1efd52e72230b771b82"
+"checksum hostname 0.1.4 (registry+https://github.com/rust-lang/crates.io-index)" = "58fab6e177434b0bb4cd344a4dabaa5bd6d7a8d792b1885aebcae7af1091d1cb"
 "checksum http 0.1.5 (registry+https://github.com/rust-lang/crates.io-index)" = "75df369fd52c60635208a4d3e694777c099569b3dcf4844df8f652dc004644ab"
 "checksum httparse 1.2.4 (registry+https://github.com/rust-lang/crates.io-index)" = "c2f407128745b78abc95c0ffbe4e5d37427fdc0d45470710cfef8c44522a2e37"
 "checksum hyper 0.11.22 (registry+https://github.com/rust-lang/crates.io-index)" = "d595f999e90624f64d2c4bc74c72adb0f3e0f773dc5692ca91338363b3568fa0"
+"checksum idna 0.1.4 (registry+https://github.com/rust-lang/crates.io-index)" = "014b298351066f1512874135335d62a789ffe78a9974f94b43ed5621951eaf7d"
 "checksum indexmap 1.0.0 (registry+https://github.com/rust-lang/crates.io-index)" = "7b9378f1f3923647a9aea6af4c6b5de68cc8a71415459ad25ef191191c48f5b7"
 "checksum iovec 0.1.2 (registry+https://github.com/rust-lang/crates.io-index)" = "dbe6e417e7d0975db6512b90796e8ce223145ac4e33c377e4a42882a0e88bb08"
+"checksum ipconfig 0.1.6 (registry+https://github.com/rust-lang/crates.io-index)" = "9ec4e18c0a0d4340870c14284293632d8421f419008371422dd327892b88877c"
 "checksum ipnet 1.0.0 (registry+https://github.com/rust-lang/crates.io-index)" = "51268c3a27ad46afd1cca0bbf423a5be2e9fd3e6a7534736c195f0f834b763ef"
 "checksum itertools 0.7.6 (registry+https://github.com/rust-lang/crates.io-index)" = "b07332223953b5051bceb67e8c4700aa65291535568e1f12408c43c4a42c0394"
 "checksum kernel32-sys 0.2.2 (registry+https://github.com/rust-lang/crates.io-index)" = "7507624b29483431c0ba2d82aece8ca6cdba9382bff4ddd0f7490560c056098d"
@@ -1143,7 +1297,10 @@ dependencies = [
 "checksum lazy_static 1.0.0 (registry+https://github.com/rust-lang/crates.io-index)" = "c8f31047daa365f19be14b47c29df4f7c3b581832407daabe6ae77397619237d"
 "checksum lazycell 0.6.0 (registry+https://github.com/rust-lang/crates.io-index)" = "a6f08839bc70ef4a3fe1d566d5350f519c5912ea86be0df1740a7d247c7fc0ef"
 "checksum libc 0.2.36 (registry+https://github.com/rust-lang/crates.io-index)" = "1e5d97d6708edaa407429faa671b942dc0f2727222fb6b6539bf1db936e4b121"
+"checksum linked-hash-map 0.4.2 (registry+https://github.com/rust-lang/crates.io-index)" = "7860ec297f7008ff7a1e3382d7f7e1dcd69efc94751a2284bafc3d013c2aa939"
 "checksum log 0.4.1 (registry+https://github.com/rust-lang/crates.io-index)" = "89f010e843f2b1a31dbd316b3b8d443758bc634bed37aabade59c686d644e0a2"
+"checksum lru-cache 0.1.1 (registry+https://github.com/rust-lang/crates.io-index)" = "4d06ff7ff06f729ce5f4e227876cb88d10bc59cd4ae1e09fbb2bde15c850dc21"
+"checksum matches 0.1.6 (registry+https://github.com/rust-lang/crates.io-index)" = "100aabe6b8ff4e4a7e32c1c13523379802df0772b82466207ac25b013f193376"
 "checksum memchr 2.0.1 (registry+https://github.com/rust-lang/crates.io-index)" = "796fba70e76612589ed2ce7f45282f5af869e0fdd7cc6199fa1aa1f1d591ba9d"
 "checksum mime 0.3.5 (registry+https://github.com/rust-lang/crates.io-index)" = "e2e00e17be181010a91dbfefb01660b17311059dc8c7f48b9017677721e732bd"
 "checksum miniz_oxide 0.1.2 (registry+https://github.com/rust-lang/crates.io-index)" = "aaa2d3ad070f428fffbd7d3ca2ea20bb0d8cffe9024405c44e1840bc1418b398"
@@ -1153,7 +1310,6 @@ dependencies = [
 "checksum miow 0.2.1 (registry+https://github.com/rust-lang/crates.io-index)" = "8c1f2f3b1cf331de6896aabf6e9d55dca90356cc9960cca7eaaf408a355ae919"
 "checksum multimap 0.4.0 (registry+https://github.com/rust-lang/crates.io-index)" = "2eb04b9f127583ed176e163fb9ec6f3e793b87e21deedd5734a69386a18a0151"
 "checksum net2 0.2.31 (registry+https://github.com/rust-lang/crates.io-index)" = "3a80f842784ef6c9a958b68b7516bc7e35883c614004dd94959a4dca1b716c09"
-"checksum ns-dns-tokio 0.4.0 (registry+https://github.com/rust-lang/crates.io-index)" = "75311dd15a3051ab6adb4ae1de6824146d304a25030b8d12e0ae842e484157c5"
 "checksum num 0.1.42 (registry+https://github.com/rust-lang/crates.io-index)" = "4703ad64153382334aa8db57c637364c322d3372e097840c72000dabdcf6156e"
 "checksum num-integer 0.1.36 (registry+https://github.com/rust-lang/crates.io-index)" = "f8d26da319fb45674985c78f1d1caf99aa4941f785d384a2ae36d0740bc3e2fe"
 "checksum num-iter 0.1.35 (registry+https://github.com/rust-lang/crates.io-index)" = "4b226df12c5a59b63569dd57fafb926d91b385dfce33d8074a412411b689d593"
@@ -1177,10 +1333,12 @@ dependencies = [
 "checksum regex-syntax 0.5.5 (registry+https://github.com/rust-lang/crates.io-index)" = "bd90079345f4a4c3409214734ae220fd773c6f2e8a543d07370c6c1c369cfbfb"
 "checksum relay 0.1.0 (registry+https://github.com/rust-lang/crates.io-index)" = "f301bafeb60867c85170031bdb2fcf24c8041f33aee09e7b116a58d4e9f781c5"
 "checksum remove_dir_all 0.5.0 (registry+https://github.com/rust-lang/crates.io-index)" = "dfc5b3ce5d5ea144bb04ebd093a9e14e9765bcfec866aecda9b6dec43b3d1e24"
+"checksum resolv-conf 0.6.0 (registry+https://github.com/rust-lang/crates.io-index)" = "8e1b086bb6a2659d6ba66e4aa21bde8a53ec03587cd5c80b83bdc3a330f35cab"
 "checksum rustc-demangle 0.1.5 (registry+https://github.com/rust-lang/crates.io-index)" = "aee45432acc62f7b9a108cc054142dac51f979e69e71ddce7d6fc7adf29e817e"
 "checksum safemem 0.2.0 (registry+https://github.com/rust-lang/crates.io-index)" = "e27a8b19b835f7aea908818e871f5cc3a5a186550c30773be987e155e8163d8f"
 "checksum scoped-tls 0.1.0 (registry+https://github.com/rust-lang/crates.io-index)" = "f417c22df063e9450888a7561788e9bd46d3bb3c1466435b4eccb903807f147d"
 "checksum slab 0.4.0 (registry+https://github.com/rust-lang/crates.io-index)" = "fdeff4cd9ecff59ec7e3744cbca73dfe5ac35c2aedb2cfba8a1c715a18912e9d"
+"checksum socket2 0.3.1 (registry+https://github.com/rust-lang/crates.io-index)" = "a76b792959eba82f021c9028c8ecb6396f085268d6d46af2ed96a829cc758d7c"
 "checksum string 0.1.0 (registry+https://github.com/rust-lang/crates.io-index)" = "31f98b200e7caca9efca50fc0aa69cd58a5ec81d5f6e75b2f3ecaad2e998972a"
 "checksum syn 0.12.10 (registry+https://github.com/rust-lang/crates.io-index)" = "7d12ebcea3f1027a817b98e91cfe30805634ea1f63e36015f765960a7782494d"
 "checksum tempdir 0.3.7 (registry+https://github.com/rust-lang/crates.io-index)" = "15f2b5fb00ccdf689e0149d1b1b3c03fead81c2b37735d812fa8bddbbf41b6d8"
@@ -1204,18 +1362,26 @@ dependencies = [
 "checksum tower-ready-service 0.1.0 (git+https://github.com/tower-rs/tower)" = "<none>"
 "checksum tower-reconnect 0.1.0 (git+https://github.com/tower-rs/tower)" = "<none>"
 "checksum tower-util 0.1.0 (git+https://github.com/tower-rs/tower)" = "<none>"
+"checksum trust-dns-proto 0.3.3 (git+https://github.com/bluejekyll/trust-dns?branch=0.8_release)" = "<none>"
+"checksum trust-dns-resolver 0.8.2 (git+https://github.com/bluejekyll/trust-dns?branch=0.8_release)" = "<none>"
 "checksum ucd-util 0.1.1 (registry+https://github.com/rust-lang/crates.io-index)" = "fd2be2d6639d0f8fe6cdda291ad456e23629558d466e2789d2c3e9892bda285d"
 "checksum unicase 2.1.0 (registry+https://github.com/rust-lang/crates.io-index)" = "284b6d3db520d67fbe88fd778c21510d1b0ba4a551e5d0fbb023d33405f6de8a"
+"checksum unicode-bidi 0.3.4 (registry+https://github.com/rust-lang/crates.io-index)" = "49f2bd0c6468a8230e1db229cff8029217cf623c767ea5d60bfbd42729ea54d5"
+"checksum unicode-normalization 0.1.5 (registry+https://github.com/rust-lang/crates.io-index)" = "51ccda9ef9efa3f7ef5d91e8f9b83bbe6955f9bf86aec89d5cce2c874625920f"
 "checksum unicode-segmentation 1.2.0 (registry+https://github.com/rust-lang/crates.io-index)" = "a8083c594e02b8ae1654ae26f0ade5158b119bd88ad0e8227a5d8fcd72407946"
 "checksum unicode-xid 0.1.0 (registry+https://github.com/rust-lang/crates.io-index)" = "fc72304796d0818e357ead4e000d19c9c174ab23dc11093ac919054d20a6a7fc"
 "checksum unreachable 1.0.0 (registry+https://github.com/rust-lang/crates.io-index)" = "382810877fe448991dfc7f0dd6e3ae5d58088fd0ea5e35189655f84e6814fa56"
+"checksum url 1.7.0 (registry+https://github.com/rust-lang/crates.io-index)" = "f808aadd8cfec6ef90e4a14eb46f24511824d1ac596b9682703c87056c8678b7"
 "checksum utf8-ranges 1.0.0 (registry+https://github.com/rust-lang/crates.io-index)" = "662fab6525a98beff2921d7f61a39e7d59e0b425ebc7d0d9e66d316e55124122"
 "checksum version_check 0.1.3 (registry+https://github.com/rust-lang/crates.io-index)" = "6b772017e347561807c1aa192438c5fd74242a670a6cffacc40f2defd1dc069d"
 "checksum void 1.0.2 (registry+https://github.com/rust-lang/crates.io-index)" = "6a02e4885ed3bc0f2de90ea6dd45ebcbb66dacffe03547fadbb0eeae2770887d"
+"checksum widestring 0.2.2 (registry+https://github.com/rust-lang/crates.io-index)" = "7157704c2e12e3d2189c507b7482c52820a16dfa4465ba91add92f266667cadb"
 "checksum winapi 0.2.8 (registry+https://github.com/rust-lang/crates.io-index)" = "167dc9d6949a9b857f3451275e911c3f44255842c1f7a76f33c55103a909087a"
 "checksum winapi 0.3.4 (registry+https://github.com/rust-lang/crates.io-index)" = "04e3bd221fcbe8a271359c04f21a76db7d0c6028862d1bb5512d85e1e2eb5bb3"
 "checksum winapi-build 0.1.1 (registry+https://github.com/rust-lang/crates.io-index)" = "2d315eee3b34aca4797b2da6b13ed88266e6d612562a0c46390af8299fc699bc"
 "checksum winapi-i686-pc-windows-gnu 0.4.0 (registry+https://github.com/rust-lang/crates.io-index)" = "ac3b87c63620426dd9b991e5ce0329eff545bccbbb34f3be09ff6fb6ab51b7b6"
 "checksum winapi-x86_64-pc-windows-gnu 0.4.0 (registry+https://github.com/rust-lang/crates.io-index)" = "712e227841d057c1ee1cd2fb22fa7e5a5461ae8e48fa2ca79ec42cfc1931183f"
 "checksum wincolor 0.1.6 (registry+https://github.com/rust-lang/crates.io-index)" = "eeb06499a3a4d44302791052df005d5232b927ed1a9658146d842165c4de7767"
+"checksum winreg 0.5.0 (registry+https://github.com/rust-lang/crates.io-index)" = "9338067aba07889a38beaad4dbb77fa2e62e87c423b770824b3bdf412874bd2c"
+"checksum winutil 0.1.1 (registry+https://github.com/rust-lang/crates.io-index)" = "7daf138b6b14196e3830a588acf1e86966c694d3e8fb026fb105b8b5dca07e6e"
 "checksum ws2_32-sys 0.2.1 (registry+https://github.com/rust-lang/crates.io-index)" = "d59cefebd0c892fa2dd6de581e937301d8552cb44489cdff035c6187cb63fa5e"

proxy/Cargo.toml

@@ -16,7 +16,6 @@ futures-mpsc-lossy              = { path = "./futures-mpsc-lossy" }
 conduit-proxy-router            = { path = "./router" }
 
 bytes = "0.4"
-domain = "0.2.3"
 deflate = {version = "0.7.18", features = ["gzip"] }
 env_logger = { version = "0.5", default-features = false }
 futures = "0.1"
@@ -37,8 +36,7 @@ tokio-signal = "0.1"
 prost = "0.3.0"
 prost-types = "0.3.0"
 
-abstract-ns = "0.4"
+trust-dns-resolver = { version = "0.8.2", default-features = false, git = "https://github.com/bluejekyll/trust-dns", branch = "0.8_release" }
-ns-dns-tokio = "0.4"
 
 #futures-watch   = { git = "https://github.com/carllerche/better-future" }
 

proxy/src/control/discovery.rs

@@ -617,7 +617,7 @@ impl<T> DestinationSet<T>
                 Ok(Async::Ready(dns::Response::Exists(ips))) => {
                     trace!("positive result of DNS query for {:?}: {:?}", authority, ips);
                     self.add(authority, ips.iter().map(|ip| {
-                        (SocketAddr::from((*ip, authority.port)), Metadata::no_metadata())
+                        (SocketAddr::from((ip, authority.port)), Metadata::no_metadata())
                     }));
                 },
                 Ok(Async::Ready(dns::Response::DoesNotExist)) => {

proxy/src/dns.rs

@@ -1,47 +1,48 @@
-use abstract_ns;
-use abstract_ns::HostResolve;
-pub use abstract_ns::IpList;
-use domain;
 use futures::prelude::*;
-use ns_dns_tokio;
 use std::fmt;
 use std::net::IpAddr;
-use std::path::Path;
-use std::str::FromStr;
 use std::time::Duration;
 use tokio_core::reactor::{Handle, Timeout};
 use transport;
+use trust_dns_resolver;
+use trust_dns_resolver::config::{ResolverConfig, ResolverOpts};
+use trust_dns_resolver::error::{ResolveError, ResolveErrorKind};
+use trust_dns_resolver::ResolverFuture;
+use trust_dns_resolver::lookup_ip::{LookupIp, LookupIpFuture};
 
 #[derive(Clone, Debug)]
-pub struct Config(domain::resolv::ResolvConf);
+pub struct Config {
+    config: ResolverConfig,
+    opts: ResolverOpts,
+}
 
 #[derive(Clone, Debug)]
 pub struct Resolver {
-    resolver: ns_dns_tokio::DnsResolver,
+    config: Config,
     executor: Handle,
 }
 
 pub enum IpAddrFuture {
-    DNS(ns_dns_tokio::HostFuture),
+    DNS(LookupIpFuture),
     Fixed(IpAddr),
 }
 
 pub enum Error {
     NoAddressesFound,
-    ResolutionFailed(<ns_dns_tokio::HostFuture as Future>::Error),
+    ResolutionFailed(ResolveError),
 }
 
 pub enum Response {
-    Exists(IpList),
+    Exists(LookupIp),
     DoesNotExist,
 }
 
 // `Box<Future>` implements `Future` so it doesn't need to be implemented manually.
-pub type IpAddrListFuture = Box<Future<Item=Response, Error=abstract_ns::Error>>;
+pub type IpAddrListFuture = Box<Future<Item=Response, Error=ResolveError>>;
 
 /// A DNS name.
 #[derive(Clone, Debug, Eq, Hash, PartialEq)]
-pub struct Name(abstract_ns::Name);
+pub struct Name(String);
 
 impl fmt::Display for Name {
     fn fmt(&self, f: &mut fmt::Formatter) -> Result<(), fmt::Error> {
@@ -49,20 +50,11 @@ impl fmt::Display for Name {
     }
 }
 
-impl Name {
+impl<'a> From<&'a str> for Name {
-    /// Parses the input string as a DNS name, normalizing it to lowercase.
+    fn from(s: &str) -> Self {
-    pub fn normalize(s: &str) -> Result<Self, ()> {
+        // TODO: Verify the name is a valid DNS name.
-        // XXX: `abstract_ns::Name::from_str()` wrongly accepts IP addresses as
+        // TODO: Avoid this extra allocation.
-        // domain names. Protect against this. TODO: Fix abstract_ns.
+        Name(s.to_ascii_lowercase())
-        if let Ok(_) = IpAddr::from_str(s) {
-            return Err(());
-        }
-        // XXX: `abstract_ns::Name::from_str()` doesn't accept uppercase letters.
-        //  TODO: Avoid this extra allocation.
-        let s = s.to_ascii_lowercase();
-        abstract_ns::Name::from_str(&s)
-            .map(Name)
-            .map_err(|_| ())
     }
 }
 
@@ -73,22 +65,23 @@ impl AsRef<str> for Name {
 }
 
 impl Config {
-    /// Note that this ignores any errors reading or parsing the resolve.conf
+    /// TODO: Make this infallible, like it is in the `domain` crate.
-    /// file, just like the `domain` crate does.
+    pub fn from_system_config() -> Result<Self, ResolveError> {
-    pub fn from_file(resolve_conf_path: &Path) -> Self {
+        let (config, opts) = trust_dns_resolver::system_conf::read_system_conf()?;
-        let mut resolv_conf = domain::resolv::ResolvConf::new();
+        trace!("DNS config: {:?}", &config);
-        let _ = resolv_conf.parse_file(resolve_conf_path);
+        trace!("DNS opts: {:?}", &opts);
-        resolv_conf.finalize();
+        Ok(Config {
-        Config(resolv_conf)
+            config,
+            opts
+        })
     }
 }
 
 impl Resolver {
     pub fn new(config: Config, executor: &Handle) -> Self {
         Resolver {
-            resolver: ns_dns_tokio::DnsResolver::new_from_resolver(
+            config,
-                domain::resolv::Resolver::from_conf(executor, config.0)),
+            executor: executor.clone(),
-            executor: executor.clone()
         }
     }
 
@@ -96,37 +89,51 @@ impl Resolver {
         match *host {
             transport::Host::DnsName(ref name) => {
                 trace!("resolve_one_ip {}", name);
-                IpAddrFuture::DNS(self.resolver.resolve_host(&name.0))
+                IpAddrFuture::DNS(self.clone().lookup_ip(name))
             }
             transport::Host::Ip(addr) => IpAddrFuture::Fixed(addr),
         }
     }
 
     pub fn resolve_all_ips(&self, delay: Duration, host: &Name) -> IpAddrListFuture {
-        let name = host.0.clone();
+        let name = host.clone();
         let name_clone = name.clone();
         trace!("resolve_all_ips {}", &name);
-        let resolver = self.resolver.clone();
+        let resolver = self.clone();
-        let f = Timeout::new(delay, &self.executor)
+        let f = Timeout::new(delay, &resolver.executor)
             .expect("Timeout::new() won't fail")
             .then(move |_| {
                 trace!("resolve_all_ips {} after delay", &name);
-                resolver.resolve_host(&name)
+                resolver.lookup_ip(&name)
             })
             .then(move |result| {
                 trace!("resolve_all_ips {}: completed with {:?}", name_clone, &result);
                 match result {
                     Ok(ips) => Ok(Response::Exists(ips)),
-                    Err(abstract_ns::Error::NameNotFound) => Ok(Response::DoesNotExist),
+                    Err(e) => {
-                    Err(e) => Err(e),
+                        if let &ResolveErrorKind::NoRecordsFound(_) = e.kind() {
+                            Ok(Response::DoesNotExist)
+                        } else {
+                            Err(e)
+                        }
+                    }
                 }
             });
         Box::new(f)
     }
+
+    // `ResolverFuture` can only be used for one lookup, so we have to clone all
+    // the state during each resolution.
+    fn lookup_ip(self, &Name(ref name): &Name) -> LookupIpFuture {
+        let resolver = ResolverFuture::new(
+            self.config.config,
+            self.config.opts,
+            &self.executor);
+        resolver.lookup_ip(name)
+    }
 }
 
 impl Future for IpAddrFuture {
-    // TODO: Return the IpList so the user can try all of them.
     type Item = IpAddr;
     type Error = Error;
 
@@ -134,9 +141,18 @@ impl Future for IpAddrFuture {
         match *self {
             IpAddrFuture::DNS(ref mut inner) => match inner.poll() {
                 Ok(Async::NotReady) => Ok(Async::NotReady),
-                Ok(Async::Ready(ips)) => ips.pick_one()
+                Ok(Async::Ready(ips)) => {
-                    .map(Async::Ready)
+                    match ips.iter().next() {
-                    .ok_or(Error::NoAddressesFound),
+                        Some(ip) => {
+                            trace!("DNS resolution found: {:?}", ip);
+                            Ok(Async::Ready(ip))
+                        },
+                        None => {
+                            trace!("DNS resolution did not find anything");
+                            Err(Error::NoAddressesFound)
+                        }
+                    }
+                },
                 Err(e) => Err(Error::ResolutionFailed(e)),
             },
             IpAddrFuture::Fixed(addr) => Ok(Async::Ready(addr)),
@@ -171,23 +187,8 @@ mod tests {
         ];
 
         for case in VALID {
-            let name = Name::normalize(case.input).expect("is a valid DNS name");
+            let name = Name::from(case.input);
             assert_eq!(name.as_ref(), case.output);
         }
-
-        static INVALID: &[&str] = &[
-            "",
-            "1.2.3.4",
-            "::1",
-            "[::1]",
-            ":1234",
-            "1.2.3.4:11234",
-            "abc.com:1234",
-        ];
-
-        for case in INVALID {
-            assert!(Name::normalize(case).is_err(),
-                    "{} is invalid", case);
-        }
     }
 }

proxy/src/lib.rs

@@ -2,11 +2,9 @@
 #![cfg_attr(feature = "cargo-clippy", allow(new_without_default_derive))]
 #![deny(warnings)]
 
-extern crate abstract_ns;
 extern crate bytes;
 extern crate conduit_proxy_controller_grpc;
 extern crate convert;
-extern crate domain;
 extern crate env_logger;
 extern crate deflate;
 #[macro_use]
@@ -22,7 +20,6 @@ extern crate ipnet;
 extern crate libc;
 #[macro_use]
 extern crate log;
-extern crate ns_dns_tokio;
 #[cfg_attr(test, macro_use)]
 extern crate indexmap;
 extern crate prost;
@@ -44,6 +41,7 @@ extern crate tower_reconnect;
 extern crate conduit_proxy_router;
 extern crate tower_util;
 extern crate tower_in_flight_limit;
+extern crate trust_dns_resolver;
 
 use futures::*;
 
@@ -204,7 +202,11 @@ where
             config.event_buffer_capacity,
         );
 
-        let dns_config = dns::Config::from_file(&config.resolv_conf_path);
+        let dns_config = dns::Config::from_system_config()
+            .unwrap_or_else(|e| {
+                // TODO: Make DNS configuration infallible.
+                panic!("invalid DNS configuration: {:?}", e);
+            });
 
         let (control, control_bg) = control::new(dns_config.clone(), config.pod_namespace.clone());
 

proxy/src/transport/connect.rs

@@ -58,16 +58,9 @@ impl HostAndPort {
     pub fn normalize(a: &http::uri::Authority, default_port: Option<u16>)
         -> Result<Self, HostAndPortError>
     {
-        let host = {
+        let host = IpAddr::from_str(a.host())
-            match dns::Name::normalize(a.host()) {
+            .map(Host::Ip)
-                Ok(host) => Host::DnsName(host),
+            .unwrap_or_else(|_| Host::DnsName(dns::Name::from(a.host())));
-                Err(_) => {
-                    let ip: IpAddr = IpAddr::from_str(a.host())
-                        .map_err(|_| HostAndPortError::InvalidHost)?;
-                    Host::Ip(ip)
-                },
-            }
-        };
         let port = a.port()
             .or(default_port)
             .ok_or_else(|| HostAndPortError::MissingPort)?;