Bump github.com/docker/docker in the prod-patch-updates group

Bumps the prod-patch-updates group with 1 update: [github.com/docker/docker](https://github.com/docker/docker).


Updates `github.com/docker/docker` from 28.5.1+incompatible to 28.5.2+incompatible
- [Release notes](https://github.com/docker/docker/releases)
- [Commits](https://github.com/docker/docker/compare/v28.5.1...v28.5.2)

---
updated-dependencies:
- dependency-name: github.com/docker/docker
  dependency-version: 28.5.2+incompatible
  dependency-type: direct:production
  update-type: version-update:semver-patch
  dependency-group: prod-patch-updates
...

Signed-off-by: dependabot[bot] <support@github.com>

flake.lock

@@ -2,16 +2,16 @@
   "nodes": {
     "nixpkgs": {
       "locked": {
-        "lastModified": 1756217674,
-        "narHash": "sha256-TH1SfSP523QI7kcPiNtMAEuwZR3Jdz0MCDXPs7TS8uo=",
+        "lastModified": 1763934636,
+        "narHash": "sha256-9glbI7f1uU+yzQCq5LwLgdZqx6svOhZWkd4JRY265fc=",
         "owner": "NixOS",
         "repo": "nixpkgs",
-        "rev": "4e7667a90c167f7a81d906e5a75cba4ad8bee620",
+        "rev": "ee09932cedcef15aaf476f9343d1dea2cb77e261",
         "type": "github"
       },
       "original": {
         "owner": "NixOS",
-        "ref": "nixos-25.05",
+        "ref": "nixpkgs-unstable",
         "repo": "nixpkgs",
         "type": "github"
       }

flake.nix

@@ -2,7 +2,7 @@
   description = "newt - A tunneling client for Pangolin";
 
   inputs = {
-    nixpkgs.url = "github:NixOS/nixpkgs/nixos-25.05";
+    nixpkgs.url = "github:NixOS/nixpkgs/nixpkgs-unstable";
   };
 
   outputs =
@@ -22,30 +22,36 @@
         system:
         let
           pkgs = pkgsFor system;
+          inherit (pkgs) lib;
 
           # Update version when releasing
-          version = "1.4.2";
-
-          # Update the version in a new source tree
-          srcWithReplacedVersion = pkgs.runCommand "newt-src-with-version" { } ''
-            cp -r ${./.} $out
-            chmod -R +w $out
-            rm -rf $out/.git $out/result $out/.envrc $out/.direnv
-            sed -i "s/version_replaceme/${version}/g" $out/main.go
-          '';
+          version = "1.6.0";
         in
         {
           default = self.packages.${system}.pangolin-newt;
+
           pangolin-newt = pkgs.buildGoModule {
             pname = "pangolin-newt";
-            version = version;
-            src = srcWithReplacedVersion;
-            vendorHash = "sha256-PENsCO2yFxLVZNPgx2OP+gWVNfjJAfXkwWS7tzlm490=";
-            meta = with pkgs.lib; {
+            inherit version;
+            src = pkgs.nix-gitignore.gitignoreSource [ ] ./.;
+
+            vendorHash = "sha256-Jbu0pz+okV4N9MHUXLcTqSr3s/k5OVZ09hNuS/+4LFY=";
+
+            env = {
+              CGO_ENABLED = 0;
+            };
+
+            ldflags = [
+              "-X main.newtVersion=${version}"
+            ];
+
+            meta = {
               description = "A tunneling client for Pangolin";
               homepage = "https://github.com/fosrl/newt";
-              license = licenses.gpl3;
-              maintainers = [ ];
+              license = lib.licenses.gpl3;
+              maintainers = [
+                lib.maintainers.water-sucks
+              ];
             };
           };
         }
@@ -54,10 +60,20 @@
         system:
         let
           pkgs = pkgsFor system;
+
+          inherit (pkgs)
+            go
+            gopls
+            gotools
+            go-outline
+            gopkgs
+            godef
+            golint
+            ;
         in
         {
           default = pkgs.mkShell {
-            buildInputs = with pkgs; [
+            buildInputs = [
               go
               gopls
               gotools

go.mod

@@ -3,7 +3,7 @@ module github.com/fosrl/newt
 go 1.25
 
 require (
-	github.com/docker/docker v28.5.1+incompatible
+	github.com/docker/docker v28.5.2+incompatible
 	github.com/google/gopacket v1.1.19
 	github.com/gorilla/websocket v1.5.3
 	github.com/prometheus/client_golang v1.23.2

go.sum

@@ -18,8 +18,8 @@ github.com/davecgh/go-spew v1.1.1 h1:vj9j/u1bqnvCEfJOwUhtlOARqs3+rkHYY13jYWTU97c
 github.com/davecgh/go-spew v1.1.1/go.mod h1:J7Y8YcW2NihsgmVo/mv3lAwl/skON4iLHjSsI+c5H38=
 github.com/distribution/reference v0.6.0 h1:0IXCQ5g4/QMHHkarYzh5l+u8T3t73zM5QvfrDyIgxBk=
 github.com/distribution/reference v0.6.0/go.mod h1:BbU0aIcezP1/5jX/8MP0YiH4SdvB5Y4f/wlDRiLyi3E=
-github.com/docker/docker v28.5.1+incompatible h1:Bm8DchhSD2J6PsFzxC35TZo4TLGR2PdW/E69rU45NhM=
-github.com/docker/docker v28.5.1+incompatible/go.mod h1:eEKB0N0r5NX/I1kEveEz05bcu8tLC/8azJZsviup8Sk=
+github.com/docker/docker v28.5.2+incompatible h1:DBX0Y0zAjZbSrm1uzOkdr1onVghKaftjlSWt4AFexzM=
+github.com/docker/docker v28.5.2+incompatible/go.mod h1:eEKB0N0r5NX/I1kEveEz05bcu8tLC/8azJZsviup8Sk=
 github.com/docker/go-connections v0.6.0 h1:LlMG9azAe1TqfR7sO+NJttz1gy6KO7VJBh+pMmjSD94=
 github.com/docker/go-connections v0.6.0/go.mod h1:AahvXYshr6JgfUJGdDCs2b5EZG/vmaMAntpSFH5BFKE=
 github.com/docker/go-units v0.4.0 h1:3uh0PgVws3nIA0Q+MwDC8yjEPf9zjRfZZWXZYDct3Tw=

healthcheck/healthcheck.go

@@ -48,6 +48,7 @@ type Config struct {
 	Headers           map[string]string `json:"hcHeaders"`
 	Method            string            `json:"hcMethod"`
 	Status            int               `json:"hcStatus"` // HTTP status code
+	TLSServerName     string            `json:"hcTlsServerName"`
 }
 
 // Target represents a health check target with its current status
@@ -70,7 +71,6 @@ type Monitor struct {
 	targets     map[int]*Target
 	mutex       sync.RWMutex
 	callback    StatusChangeCallback
-	client      *http.Client
 	enforceCert bool
 }
 
@@ -78,21 +78,10 @@ type Monitor struct {
 func NewMonitor(callback StatusChangeCallback, enforceCert bool) *Monitor {
 	logger.Debug("Creating new health check monitor with certificate enforcement: %t", enforceCert)
 
-	// Configure TLS settings based on certificate enforcement
-	transport := &http.Transport{
-		TLSClientConfig: &tls.Config{
-			InsecureSkipVerify: !enforceCert,
-		},
-	}
-
 	return &Monitor{
 		targets:     make(map[int]*Target),
 		callback:    callback,
 		enforceCert: enforceCert,
-		client: &http.Client{
-			Timeout:   30 * time.Second,
-			Transport: transport,
-		},
 	}
 }
 
@@ -388,6 +377,17 @@ func (m *Monitor) performHealthCheck(target *Target) {
 	ctx, cancel := context.WithTimeout(context.Background(), time.Duration(target.Config.Timeout)*time.Second)
 	defer cancel()
 
+	client := &http.Client{
+		Transport: &http.Transport{
+			TLSClientConfig: &tls.Config{
+				// Configure TLS settings based on certificate enforcement
+				InsecureSkipVerify: !m.enforceCert,
+				// Use SNI TLS header if present
+				ServerName: target.Config.TLSServerName,
+			},
+		},
+	}
+
 	req, err := http.NewRequestWithContext(ctx, target.Config.Method, url, nil)
 	if err != nil {
 		target.Status = StatusUnhealthy
@@ -402,7 +402,7 @@ func (m *Monitor) performHealthCheck(target *Target) {
 	}
 
 	// Perform request
-	resp, err := m.client.Do(req)
+	resp, err := client.Do(req)
 	if err != nil {
 		target.Status = StatusUnhealthy
 		target.LastError = fmt.Sprintf("request failed: %v", err)