Completed skeleton for DNS challenge, added Cloudflare DNS integration.

Cargo.lock

@@ -143,6 +143,7 @@ dependencies = [
  "dashmap 7.0.0-rc2",
  "elasticsearch",
  "futures",
+ "hickory-resolver",
  "http-body-util",
  "humantime",
  "hyper",
@@ -762,6 +763,12 @@ dependencies = [
  "cfg-if",
 ]
 
+[[package]]
+name = "critical-section"
+version = "1.2.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "790eea4361631c5e7d22598ecd5723ff611904e3344ce8720784c93e3d83d40b"
+
 [[package]]
 name = "crossbeam-channel"
 version = "0.5.16"
@@ -1646,6 +1653,76 @@ version = "0.4.3"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "7f24254aa9a54b5c858eaee2f5bccdb46aaf0e486a595ed5fd8f86ba55232a70"
 
+[[package]]
+name = "hickory-net"
+version = "0.26.3"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "c480823ed7c2c5d0f09c41020cb6b7c28029ce60ec42dc942158dcf22f8e0a4d"
+dependencies = [
+ "async-trait",
+ "cfg-if",
+ "data-encoding",
+ "futures-channel",
+ "futures-io",
+ "futures-util",
+ "hickory-proto",
+ "idna",
+ "ipnet",
+ "jni",
+ "rand 0.10.2",
+ "thiserror 2.0.18",
+ "tinyvec",
+ "tokio",
+ "tracing",
+ "url",
+]
+
+[[package]]
+name = "hickory-proto"
+version = "0.26.3"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "12b92608f679a6fa515dd1d15c1ff89443026e391200a2c840c7afcba482893d"
+dependencies = [
+ "data-encoding",
+ "idna",
+ "ipnet",
+ "jni",
+ "once_cell",
+ "prefix-trie",
+ "rand 0.10.2",
+ "ring",
+ "thiserror 2.0.18",
+ "tinyvec",
+ "tracing",
+ "url",
+]
+
+[[package]]
+name = "hickory-resolver"
+version = "0.26.3"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "3f3da5255c95d5a716857d54b5b8f4e8d67c3484d3beaaaae2ce25063b3ba981"
+dependencies = [
+ "cfg-if",
+ "futures-util",
+ "hickory-net",
+ "hickory-proto",
+ "ipconfig",
+ "ipnet",
+ "jni",
+ "moka",
+ "ndk-context",
+ "once_cell",
+ "parking_lot",
+ "rand 0.10.2",
+ "resolv-conf",
+ "smallvec",
+ "system-configuration",
+ "thiserror 2.0.18",
+ "tokio",
+ "tracing",
+]
+
 [[package]]
 name = "hkdf"
 version = "0.12.4"
@@ -2047,11 +2124,27 @@ dependencies = [
  "rustversion",
 ]
 
+[[package]]
+name = "ipconfig"
+version = "0.3.4"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "4d40460c0ce33d6ce4b0630ad68ff63d6661961c48b6dba35e5a4d81cfb48222"
+dependencies = [
+ "socket2",
+ "widestring",
+ "windows-registry",
+ "windows-result",
+ "windows-sys 0.61.2",
+]
+
 [[package]]
 name = "ipnet"
 version = "2.12.2"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "791930b43c0d5973160d90a8f3894509f2b273430f5c5c73b668636d0287c5c0"
+dependencies = [
+ "serde",
+]
 
 [[package]]
 name = "is_terminal_polyfill"
@@ -2617,6 +2710,12 @@ dependencies = [
  "tempfile",
 ]
 
+[[package]]
+name = "ndk-context"
+version = "0.1.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "27b02d87554356db9e9a873add8782d4ea6e3e58ea071a9adb9a2e8ddb884a8b"
+
 [[package]]
 name = "nix"
 version = "0.30.1"
@@ -2809,6 +2908,10 @@ name = "once_cell"
 version = "1.21.4"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "9f7c3e4beb33f85d45ae3e3a1792185706c8e16d043238c593331cc7cd313b50"
+dependencies = [
+ "critical-section",
+ "portable-atomic",
+]
 
 [[package]]
 name = "once_cell_polyfill"
@@ -3387,6 +3490,17 @@ dependencies = [
  "zerocopy",
 ]
 
+[[package]]
+name = "prefix-trie"
+version = "0.8.4"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "4cf6e3177f0684016a5c209b00882e15f8bdd3f3bb48f0491df10cd102d0c6e7"
+dependencies = [
+ "either",
+ "ipnet",
+ "num-traits",
+]
+
 [[package]]
 name = "primeorder"
 version = "0.13.6"
@@ -3660,6 +3774,12 @@ dependencies = [
  "web-sys",
 ]
 
+[[package]]
+name = "resolv-conf"
+version = "0.7.6"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "1e061d1b48cb8d38042de4ae0a7a6401009d6143dc80d2e2d6f31f0bdd6470c7"
+
 [[package]]
 name = "rfc6979"
 version = "0.4.0"
@@ -5014,6 +5134,12 @@ dependencies = [
  "rustls-pki-types",
 ]
 
+[[package]]
+name = "widestring"
+version = "1.2.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "72069c3113ab32ab29e5584db3c6ec55d416895e60715417b5b883a357c3e471"
+
 [[package]]
 name = "winapi"
 version = "0.3.9"