chore(acap3): add remaining app source files (Makefile, launcher.c, package.conf)

arm_acap3/app/LICENSE

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+BSD 3-Clause License
+
+Copyright (c) 2020 Tailscale & AUTHORS.
+All rights reserved.
+
+Redistribution and use in source and binary forms, with or without
+modification, are permitted provided that the following conditions are met:
+
+1. Redistributions of source code must retain the above copyright notice, this
+   list of conditions and the following disclaimer.
+
+2. Redistributions in binary form must reproduce the above copyright notice,
+   this list of conditions and the following disclaimer in the documentation
+   and/or other materials provided with the distribution.
+
+3. Neither the name of the copyright holder nor the names of its
+   contributors may be used to endorse or promote products derived from
+   this software without specific prior written permission.
+
+THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
+AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
+DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
+FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
+SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
+CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
+OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.

arm_acap3/app/Makefile

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+nop:

arm_acap3/app/launcher.c

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+#include <unistd.h>
+#include <sys/wait.h>
+#include <errno.h>
+#include <signal.h>
+
+/*
+ * ACAP 3 supervisor launcher for Tailscale_VPN.
+ *
+ * elflibcheck.sh requires APPNAME to be an ELF binary.
+ * acap-startstop / respawnd / list.cgi all use pidof(APPNAME) for status.
+ *
+ * This binary NEVER exits voluntarily — it loops restarting start.sh if it
+ * dies, so:
+ *   - pidof Tailscale_VPN always finds this process → UI shows "Running"
+ *   - respawnd never triggers (it only fires when APPNAME exits)
+ *   - If tailscaled OOMs and start.sh exits, we cleanly restart it
+ *
+ * To stop the app, acap-startstop calls stop_daemon which sends SIGTERM here.
+ * We forward SIGTERM/SIGINT to the child and then exit.
+ */
+
+static volatile int g_stop = 0;
+static volatile pid_t g_child = -1;
+
+static void sig_forward(int sig) {
+    g_stop = 1;
+    if (g_child > 0)
+        kill(g_child, sig);
+}
+
+int main(void)
+{
+    signal(SIGTERM, sig_forward);
+    signal(SIGINT,  sig_forward);
+    signal(SIGCHLD, SIG_DFL);
+
+    while (!g_stop) {
+        pid_t pid = fork();
+        if (pid == 0) {
+            /* child: reset signals and exec start.sh */
+            signal(SIGTERM, SIG_DFL);
+            signal(SIGINT,  SIG_DFL);
+            execl("/usr/local/packages/Tailscale_VPN/start.sh",
+                  "/usr/local/packages/Tailscale_VPN/start.sh", (char *)0);
+            _exit(127);
+        }
+        if (pid < 0) {
+            sleep(5);
+            continue;
+        }
+        g_child = pid;
+
+        int status;
+        pid_t ret;
+        do {
+            ret = waitpid(pid, &status, 0);
+        } while (ret == -1 && errno == EINTR && !g_stop);
+
+        g_child = -1;
+
+        if (!g_stop) {
+            /* start.sh died unexpectedly — wait before restarting */
+            sleep(3);
+        }
+    }
+    return 0;
+}

arm_acap3/app/package.conf

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+PACKAGENAME=Tailscale_VPN
+MENUNAME="Tailscale VPN"
+VENDOR="Mo3he"
+APPMAJORVERSION=1
+APPMINORVERSION=96
+APPMICROVERSION=4
+APPTYPE=armv7hf
+APPNAME=Tailscale_VPN
+APPOPTS=""
+STARTMODE=respawn
+OTHERFILES="lib html index.html LICENSE start.sh"
+SETTINGSPAGEFILE=index.html
+GRPNAME=
+USERNAME=root