8181571: printing to CUPS fails on mac sandbox app

src/java.desktop/unix/classes/sun/print/CUPSPrinter.java

@@ -54,6 +54,7 @@ public class CUPSPrinter  {
     private static native String getCupsServer();
     private static native int getCupsPort();
     private static native String getCupsDefaultPrinter();
+    private static native String[] getCupsDefaultPrinters();
     private static native boolean canConnect(String server, int port);
     private static native boolean initIDs();
     // These functions need to be synchronized as
@@ -78,6 +79,7 @@ public class CUPSPrinter  {
 
     private static boolean libFound;
     private static String cupsServer = null;
+    private static String domainSocketPathname = null;
     private static int cupsPort = 0;
 
     static {
@@ -92,6 +94,13 @@ public Void run() {
         libFound = initIDs();
         if (libFound) {
            cupsServer = getCupsServer();
+           // Is this a local domain socket pathname?
+           if (cupsServer != null && cupsServer.startsWith("/")) {
+               if (isSandboxedApp()) {
+                   domainSocketPathname = cupsServer;
+               }
+               cupsServer = "localhost";
+           }
            cupsPort = getCupsPort();
         }
     }
@@ -376,6 +385,20 @@ public OutputStream run() {
      * Get list of all CUPS printers using IPP.
      */
     static String[] getAllPrinters() {
+
+        if (getDomainSocketPathname() != null) {
+            String[] printerNames = getCupsDefaultPrinters();
+            if (printerNames != null && printerNames.length > 0) {
+                String[] printerURIs = new String[printerNames.length];
+                for (int i=0; i< printerNames.length; i++) {
+                    printerURIs[i] = String.format("ipp://%s:%d/printers/%s",
+                            getServer(), getPort(), printerNames[i]);
+                }
+                return printerURIs;
+            }
+            return null;
+        }
+
         try {
             URL url = new URL("http", getServer(), getPort(), "");
 
@@ -458,15 +481,39 @@ public static int getPort() {
         return cupsPort;
     }
 
+    /**
+     * Returns CUPS domain socket pathname.
+     */
+    private static String getDomainSocketPathname() {
+        return domainSocketPathname;
+    }
+
+    @SuppressWarnings("removal")
+    private static boolean isSandboxedApp() {
+        if (PrintServiceLookupProvider.isMac()) {
+            return java.security.AccessController
+                    .doPrivileged((java.security.PrivilegedAction<Boolean>) () ->
+                            System.getenv("APP_SANDBOX_CONTAINER_ID") != null);
+        }
+        return false;
+    }
+
+
     /**
      * Detects if CUPS is running.
      */
     public static boolean isCupsRunning() {
         IPPPrintService.debug_println(debugPrefix+"libFound "+libFound);
         if (libFound) {
-            IPPPrintService.debug_println(debugPrefix+"CUPS server "+getServer()+
-                                          " port "+getPort());
-            return canConnect(getServer(), getPort());
+            String server = getDomainSocketPathname() != null
+                    ? getDomainSocketPathname()
+                    : getServer();
+            IPPPrintService.debug_println(debugPrefix+"CUPS server "+server+
+                                          " port "+getPort()+
+                                          (getDomainSocketPathname() != null
+                                                  ? " use domain socket pathname"
+                                                  : ""));
+            return canConnect(server, getPort());
         } else {
             return false;
         }

src/java.desktop/unix/native/common/awt/CUPSfuncs.c

@@ -172,12 +172,7 @@ Java_sun_print_CUPSPrinter_getCupsServer(JNIEnv *env,
     jstring cServer = NULL;
     const char* server = j2d_cupsServer();
     if (server != NULL) {
-        // Is this a local domain socket?
-        if (strncmp(server, "/", 1) == 0) {
-            cServer = JNU_NewStringPlatform(env, "localhost");
-        } else {
-            cServer = JNU_NewStringPlatform(env, server);
-        }
+        cServer = JNU_NewStringPlatform(env, server);
     }
     return cServer;
 }
@@ -219,6 +214,57 @@ Java_sun_print_CUPSPrinter_getCupsDefaultPrinter(JNIEnv *env,
     return cDefPrinter;
 }
 
+/*
+ * Returns list of default local printers
+ */
+JNIEXPORT jobjectArray JNICALL
+Java_sun_print_CUPSPrinter_getCupsDefaultPrinters(JNIEnv *env,
+                                                        jobject printObj)
+{
+    cups_dest_t *dests;
+    int i, j, num_dests;
+    jstring utf_str;
+    jclass cls;
+    jobjectArray nameArray = NULL;
+
+    cls = (*env)->FindClass(env, "java/lang/String");
+    CHECK_NULL_RETURN(cls, NULL);
+
+    num_dests = j2d_cupsGetDests(&dests);
+
+    if (dests == NULL) {
+        return NULL;
+    }
+
+    nameArray = (*env)->NewObjectArray(env, num_dests, cls, NULL);
+    if (nameArray == NULL) {
+        j2d_cupsFreeDests(num_dests, dests);
+        DPRINTF("CUPSfuncs::bad alloc new array\n", "")
+        return NULL;
+    }
+
+    for (i = 0; i < num_dests; i++) {
+            utf_str = JNU_NewStringPlatform(env, dests[i].name);
+            if (utf_str == NULL) {
+                for (j = i - 1; j >= 0; j--) {
+                    utf_str = (*env)->GetObjectArrayElement(env, nameArray, j);
+                    (*env)->SetObjectArrayElement(env, nameArray, j, NULL);
+                    (*env)->DeleteLocalRef(env, utf_str);
+                    utf_str = NULL;
+                }
+                j2d_cupsFreeDests(num_dests, dests);
+                (*env)->DeleteLocalRef(env, nameArray);
+                DPRINTF("CUPSfuncs::bad alloc new string ->name\n", "")
+                return NULL;
+            }
+            (*env)->SetObjectArrayElement(env, nameArray, i, utf_str);
+            (*env)->DeleteLocalRef(env, utf_str);
+    }
+
+    j2d_cupsFreeDests(num_dests, dests);
+    return nameArray;
+}
+
 /*
  * Checks if connection can be made to the server.
  *