From dedaf9d8ef531e583809b29af785159b6d2a41d8 Mon Sep 17 00:00:00 2001
From: Roy Olav Purser <admin@royolav.net>
Date: Fri, 9 Feb 2024 00:01:58 +0100
Subject: [PATCH] add launch tool

---
 src/enter_vpn.c | 36 ++++++++++++++++++++++++++++++++++++
 1 file changed, 36 insertions(+)
 create mode 100644 src/enter_vpn.c

diff --git a/src/enter_vpn.c b/src/enter_vpn.c
new file mode 100644
index 0000000..fdc1a1c
--- /dev/null
+++ b/src/enter_vpn.c
@@ -0,0 +1,36 @@
+#define _GNU_SOURCE
+
+#include <sched.h>
+#include <fcntl.h>
+#include <pwd.h>
+#include <stdio.h>
+#include <unistd.h>
+#include <string.h>
+
+int main() {
+    char shell[128] = {0};
+
+    struct passwd *pw = getpwent();
+    strlcpy(shell, pw->pw_shell, sizeof(shell));
+
+    endpwent();
+
+    int fd = open("/run/vpn/net", 0);
+
+    if(fd > 0) {
+        int failure = setns(fd, CLONE_NEWNET);
+        if(failure) {
+            perror("setns /run/vpn/net");
+        }
+        close(fd);
+        if(failure) {
+            return 1;
+        }
+    } else {
+        perror("open /run/vpn/net");
+        return 1;
+    }
+    execl(shell, shell, NULL);
+    perror(NULL);
+    return 0;
+}