Add olm agentVersion to separate the library from the agent

server/lib/clientVersionChecks.ts

@@ -1,16 +1,20 @@
 import semver from "semver";
 
+// NEWT AND OLM
+// Pass the newt/olm library version (newts.version / olms.version), not
+// agentVersion: the agent may be an app embedding the library (the CLI,
+// Pangolin Windows, ...) whose version is unrelated to the protocol support.
 export function canCompress(
     clientVersion: string | null | undefined,
-    type: "newt" | "olm"
+    agent: "newt" | "olm"
 ): boolean {
     try {
         if (!clientVersion) return false;
         // check if it is a valid semver
         if (!semver.valid(clientVersion)) return false;
-        if (type === "newt") {
+        if (agent === "newt") {
             return semver.gte(clientVersion, "1.10.3");
-        } else if (type === "olm") {
+        } else if (agent === "olm") {
             return semver.gte(clientVersion, "1.4.3");
         }
         return false;
@@ -23,6 +27,7 @@ export function canCompress(
 // sync message's `certs` array, instead of requiring each target to carry
 // its own inline `tlsCert`/`tlsKey` PEM data. Bump the version floor here to
 // match whatever release first ships the newt-side support.
+// NEWT
 export function supportsCertReferences(
     clientVersion: string | null | undefined
 ): boolean {
@@ -38,6 +43,7 @@ export function supportsCertReferences(
 // Whether this newt client understands newt/wg/client-identities/add, used to
 // set Remote-* headers on requests through its HTTP proxy. Bump the version
 // floor here to match whatever release first ships the newt-side support.
+// NEWT
 export function supportsClientIdentities(
     clientVersion: string | null | undefined
 ): boolean {
@@ -49,3 +55,33 @@ export function supportsClientIdentities(
         return false;
     }
 }
+
+// Whether this newt client understands the v2 subnet proxy target format.
+// Older clients need targets converted back to v1 before they are sent.
+// NEWT
+export function supportsTargetsV2(
+    clientVersion: string | null | undefined
+): boolean {
+    try {
+        if (!clientVersion) return false;
+        if (!semver.valid(clientVersion)) return false;
+        return semver.gte(clientVersion, "1.10.3");
+    } catch {
+        return false;
+    }
+}
+
+// Whether this newt client understands the sync message sent when its config
+// version falls behind the server's.
+// NEWT
+export function supportsSync(
+    clientVersion: string | null | undefined
+): boolean {
+    try {
+        if (!clientVersion) return false;
+        if (!semver.valid(clientVersion)) return false;
+        return semver.gte(clientVersion, "1.14.0");
+    } catch {
+        return false;
+    }
+}