Make private applets hidden

native/src/core/applets.cpp

@@ -8,45 +8,68 @@
 
 using namespace std;
 
-using main_fun = int (*)(int, char *[]);
+struct Applet {
+    string_view name;
+    int (*fn)(int, char *[]);
+};
 
-constexpr const char *applets[] = { "su", "resetprop", "zygisk", nullptr };
-static main_fun applet_mains[] = { su_client_main, resetprop_main, zygisk_main, nullptr };
+constexpr Applet applets[] = {
+    { "su", su_client_main },
+    { "resetprop", resetprop_main },
+};
 
-static int call_applet(int argc, char *argv[]) {
-    // Applets
-    string_view base = basename(argv[0]);
-    for (int i = 0; applets[i]; ++i) {
-        if (base == applets[i]) {
-            return (*applet_mains[i])(argc, argv);
-        }
-    }
-    fprintf(stderr, "%s: applet not found\n", base.data());
-    return 1;
-}
+constexpr Applet private_applets[] = {
+    { "zygisk", zygisk_main },
+};
 
 int main(int argc, char *argv[]) {
+    if (argc < 1)
+        return 1;
+
     enable_selinux();
     cmdline_logging();
     init_argv0(argc, argv);
 
-    string_view base = basename(argv[0]);
+    string_view argv0 = basename(argv[0]);
 
     // app_process is actually not an applet
-    if (str_starts(base, "app_process")) {
+    if (argv0.starts_with("app_process")) {
         return app_process_main(argc, argv);
     }
 
     umask(0);
-    if (base == "magisk" || base == "magisk32" || base == "magisk64") {
-        if (argc > 1 && argv[1][0] != '-') {
-            // Calling applet via magisk [applet] args
+
+    if (argv[0][0] == '\0') {
+        // When argv[0] is an empty string, we're calling private applets
+        if (argc < 2)
+            return 1;
         --argc;
         ++argv;
+        for (const auto &app : private_applets) {
+            if (argv[0] == app.name) {
+                return app.fn(argc, argv);
+            }
+        }
+        fprintf(stderr, "%s: applet not found\n", argv[0]);
+        return 1;
+    }
+
+    if (argv0 == "magisk" || argv0 == "magisk32" || argv0 == "magisk64") {
+        if (argc > 1 && argv[1][0] != '-') {
+            // Calling applet with "magisk [applet] args..."
+            --argc;
+            ++argv;
+            argv0 = argv[0];
         } else {
             return magisk_main(argc, argv);
         }
     }
 
-    return call_applet(argc, argv);
+    for (const auto &app : applets) {
+        if (argv0 == app.name) {
+            return app.fn(argc, argv);
+        }
+    }
+    fprintf(stderr, "%s: applet not found\n", argv0.data());
+    return 1;
 }

native/src/zygisk/entry.cpp

@@ -177,7 +177,7 @@ static void connect_companion(int client, bool is_64_bit) {
             fcntl(fds[1], F_SETFD, 0);
             char buf[16];
             snprintf(buf, sizeof(buf), "%d", fds[1]);
-            execl(exe.data(), "zygisk", "companion", buf, (char *) nullptr);
+            execl(exe.data(), "", "zygisk", "companion", buf, (char *) nullptr);
             exit(-1);
         }
         close(fds[1]);

native/src/zygisk/main.cpp

@@ -46,17 +46,16 @@ int app_process_main(int argc, char *argv[]) {
             fcntl(fds[1], F_SETFD, 0);
             snprintf(buf, sizeof(buf), "%d", fds[1]);
 #if defined(__LP64__)
-            execlp("magisk", "zygisk", "passthrough", buf, "1", (char *) nullptr);
+            execlp("magisk", "", "zygisk", "passthrough", buf, "1", (char *) nullptr);
 #else
-            execlp("magisk", "zygisk", "passthrough", buf, "0", (char *) nullptr);
+            execlp("magisk", "", "zygisk", "passthrough", buf, "0", (char *) nullptr);
 #endif
             exit(-1);
         }
 
         close(fds[1]);
         if (read_int(fds[0]) != 0) {
-            fprintf(stderr, "Failed to connect magisk daemon, "
-                            "try umount %s or reboot.\n", argv[0]);
+            fprintf(stderr, "Failed to connect magiskd, try umount %s or reboot.\n", argv[0]);
             return 1;
         }
         int app_proc_fd = recv_fd(fds[0]);