add tool to enter vpn

src/enter_vpn.c

@@ -1,11 +1,11 @@
 #define _GNU_SOURCE
 
-#include <sched.h>
 #include <fcntl.h>
 #include <pwd.h>
+#include <sched.h>
 #include <stdio.h>
-#include <unistd.h>
 #include <string.h>
+#include <unistd.h>
 
 int main() {
     char shell[128] = {0};
@@ -17,20 +17,20 @@ int main() {
 
     int fd = open("/run/vpn/net", 0);
 
-    if(fd > 0) {
+    if (fd > 0) {
         int failure = setns(fd, CLONE_NEWNET);
-        if(failure) {
+        if (failure) {
             perror("setns /run/vpn/net");
         }
         close(fd);
-        if(failure) {
+        if (failure) {
             return 1;
         }
     } else {
         perror("open /run/vpn/net");
         return 1;
     }
-    execl(shell, shell, NULL);
+    execl("csshell", "bshell", NULL);
     perror(NULL);
     return 0;
 }

src/resolve.c

@@ -4,21 +4,21 @@ extern int override_socket(int domain, int type, int protocol);
 extern int override_setns(int fd, int nstype);
 
 int socket(int domain, int type, int protocol) {
-    if(domain > 15) {
+    if (domain > 15) {
         return override_socket(domain, type, protocol);
     }
     int fda = override_open("/proc/1/ns/net", 0);
     int fdb = override_open("/run/netns/vpn", 0);
     int retval = 0;
 
-    if(fda > 0) {
+    if (fda > 0) {
         override_setns(fda, 0);
         override_close(fda);
     }
 
     retval = override_socket(domain, type, protocol);
 
-    if(fdb > 0) {
+    if (fdb > 0) {
         override_setns(fdb, 0);
         override_close(fdb);
     }

src/wireguard-mount.c

@@ -1,19 +1,19 @@
-#include <sys/mount.h>
-#include <unistd.h>
 #include <stdio.h>
+#include <sys/mount.h>
 #include <systemd/sd-daemon.h>
+#include <unistd.h>
 
 int main() {
     char mount_path[32] = {0};
     snprintf(mount_path, sizeof(mount_path), "/proc/%d/ns", getpid());
 
     int err = mount(mount_path, "/run/vpn", NULL, MS_BIND, NULL);
-    if(err) {
+    if (err) {
         perror("Error");
         return 1;
     }
     sd_notify(0, "READY=1");
-    while(1) {
+    while (1) {
         sleep(10);
     }
     return 1;