ucentral-schema: add udhcpc-vsi-parse script

Fixes: WIFI-14271
Signed-off-by: Paul White <paul@shasta.cloud>

feeds/ucentral/ucentral-schema/files/etc/udhcpc.user.d/udhcpc-vsi-parse.sh

@@ -0,0 +1,3 @@
+#!/bin/sh
+
+/usr/share/ucentral/udhcpc-vsi-parse.uc "$@"

feeds/ucentral/ucentral-schema/files/usr/share/ucentral/udhcpc-vsi-parse.uc

@@ -0,0 +1,49 @@
+#!/usr/bin/ucode
+
+let fs = require("fs");
+
+let cmd = ARGV[0];
+let ifname = getenv("interface");
+let vendor = getenv("vendor");
+let value = getenv("opt43");
+
+if (!ifname)
+        exit(0);
+
+if (!vendor)
+    vendor = "unknown";
+
+if (cmd == "deconfig" || !vendor || !value) {
+        // No VSI available
+        if (fs.stat("/tmp/udhcpc-vsi.json")) {
+                let f = fs.open("/tmp/udhcpc-vsi.json", "r");
+                let r_list = json(f.read('all'));
+                f.close();
+                if (type(r_list) == "object")
+                        vsi_list = r_list;
+
+                if (ifname in vsi_list) {
+                        delete vsi_list[ifname];
+                        if (length(vsi_list))
+                                fs.writefile("/tmp/udhcpc-vsi.json", vsi_list);
+                        else
+                                fs.unlink("/tmp/udhcpc-vsi.json");
+                }
+        }
+}
+else if (cmd == "bound") {
+    let vsi = { vendor, value };
+
+    let vsi_list = {};
+    if (fs.stat("/tmp/udhcpc-vsi.json")) {
+            let f = fs.open("/tmp/udhcpc-vsi.json", "r");
+            let r_list = json(f.read('all'));
+            f.close();
+            if (type(r_list) == "object")
+                    vsi_list = r_list;
+    }
+    vsi_list[ifname] = vsi;
+    fs.writefile("/tmp/udhcpc-vsi.json", vsi_list);
+}
+
+exit(0);