Added --register-dns option for Windows.

Fixed some issues on Windows with --log, subprocess creation
for command execution, and stdout/stderr redirection.

Version 2.1.1m.


git-svn-id: http://svn.openvpn.net/projects/openvpn/branches/BETA21/openvpn@6304 e7ae566f-a301-0410-adde-c780ea21d3b5

error.c

@@ -521,6 +521,10 @@ redirect_stdout_stderr (const char *file, bool append)
       if (msgfp == NULL)
 	msg (M_ERR, "Error: --log redirect failed due to _fdopen");
 
+      /* redirect C-library stdout/stderr to log file */
+      if (_dup2 (log_fd, 1) == -1 || _dup2 (log_fd, 2) == -1)
+	msg (M_WARN, "Error: --log redirect of stdout/stderr failed");
+
       std_redir = true;
     }
 #elif defined(HAVE_DUP2)

init.c

@@ -1138,6 +1138,10 @@ initialization_sequence_completed (struct context *c, const unsigned int flags)
   if ((flags & (ISC_ERRORS|ISC_SERVER)) == 0 && connection_list_defined (&c->options))
     connection_list_set_no_advance (&c->options);
 
+#ifdef WIN32
+  fork_register_dns_action (c->c1.tuntap);
+#endif
+
 #ifdef ENABLE_MANAGEMENT
   /* Tell management interface that we initialized */
   if (management)

openvpn.8

@@ -4749,6 +4749,12 @@ This option has the same caveats as
 above.
 .\"*********************************************************
 .TP
+.B --register-dns
+Run ipconfig /flushdns and ipconfig /registerdns on
+connection initiation.  This is known to kick Windows into
+recognizing pushed DNS servers.
+.\"*********************************************************
+.TP
 .B --pause-exit
 Put up a "press any key to continue" message on the console prior
 to OpenVPN program exit.  This option is automatically used by the

options.c

@@ -615,6 +615,8 @@ static const char usage_message[] =
   "--dhcp-pre-release : Ask Windows to release the previous TAP adapter lease on\n"
 "                       startup.\n"
   "--dhcp-release     : Ask Windows to release the TAP adapter lease on shutdown.\n"
+  "--register-dns     : Run ipconfig /flushdns and ipconfig /registerdns on\n"
+  "                     connection initiation.\n"
   "--tap-sleep n   : Sleep for n seconds after TAP adapter open before\n"
   "                  attempting to set adapter properties.\n"
   "--pause-exit         : When run from a console window, pause before exiting.\n"
@@ -5288,7 +5290,7 @@ add_option (struct options *options,
       VERIFY_PERMISSION (OPT_P_IPWIN32);
       options->tuntap_options.dhcp_release = true;
     }
-  else if (streq (p[0], "dhcp-rr") && p[1]) /* standalone method for internal use */
+  else if (streq (p[0], "dhcp-internal") && p[1]) /* standalone method for internal use */
     {
       unsigned int adapter_index;
       VERIFY_PERMISSION (OPT_P_GENERAL);
@@ -5299,13 +5301,26 @@ add_option (struct options *options,
 	dhcp_release_by_adapter_index (adapter_index);
       if (options->tuntap_options.dhcp_renew)
 	dhcp_renew_by_adapter_index (adapter_index);
-      openvpn_exit (OPENVPN_EXIT_STATUS_USAGE); /* exit point */
+      openvpn_exit (OPENVPN_EXIT_STATUS_GOOD); /* exit point */
+    }
+  else if (streq (p[0], "register-dns"))
+    {
+      VERIFY_PERMISSION (OPT_P_IPWIN32);
+      options->tuntap_options.register_dns = true;
+    }
+  else if (streq (p[0], "rdns-internal")) /* standalone method for internal use */
+    {
+      VERIFY_PERMISSION (OPT_P_GENERAL);
+      set_debug_level (options->verbosity, SDL_CONSTRAIN);
+      if (options->tuntap_options.register_dns)
+	ipconfig_register_dns (NULL);
+      openvpn_exit (OPENVPN_EXIT_STATUS_GOOD); /* exit point */
     }
   else if (streq (p[0], "show-valid-subnets"))
     {
       VERIFY_PERMISSION (OPT_P_GENERAL);
       show_valid_win32_tun_subnets ();
-      openvpn_exit (OPENVPN_EXIT_STATUS_USAGE); /* exit point */
+      openvpn_exit (OPENVPN_EXIT_STATUS_GOOD); /* exit point */
     }
   else if (streq (p[0], "pause-exit"))
     {

tun.c

@@ -3382,6 +3382,28 @@ netsh_command (const struct argv *a, int n)
   msg (M_FATAL, "NETSH: command failed");
 }
 
+void
+ipconfig_register_dns (const struct env_set *es)
+{
+  struct argv argv;
+  bool status;
+  const char err[] = "ERROR: Windows ipconfig command failed";
+
+  netcmd_semaphore_lock ();
+  argv_init (&argv);
+  argv_printf (&argv, "%s%sc /flushdns",
+	       get_win_sys_path(),
+	       WIN_IPCONFIG_PATH_SUFFIX);
+  status = openvpn_execve_check (&argv, es, 0, err);
+  argv_reset(&argv);
+  argv_printf (&argv, "%s%sc /registerdns",
+	       get_win_sys_path(),
+	       WIN_IPCONFIG_PATH_SUFFIX);
+  status = openvpn_execve_check (&argv, es, 0, err);
+  argv_reset(&argv);
+  netcmd_semaphore_release ();
+}
+
 void
 ip_addr_string_to_array (in_addr_t *dest, int *dest_len, const IP_ADDR_STRING *src)
 {
@@ -3817,13 +3839,28 @@ fork_dhcp_action (struct tuntap *tt)
 	buf_printf (&cmd, " --dhcp-pre-release");
       if (tt->options.dhcp_renew)
 	buf_printf (&cmd, " --dhcp-renew");
-      buf_printf (&cmd, " --dhcp-rr %u", (unsigned int)tt->adapter_index);
+      buf_printf (&cmd, " --dhcp-internal %u", (unsigned int)tt->adapter_index);
 
       fork_to_self (BSTR (&cmd));
       gc_free (&gc);
     }
 }
 
+void
+fork_register_dns_action (struct tuntap *tt)
+{
+  if (tt && tt->options.register_dns)
+    {
+      struct gc_arena gc = gc_new ();
+      struct buffer cmd = alloc_buf_gc (256, &gc);
+      const int verb = 3;
+ 
+      buf_printf (&cmd, "openvpn --verb %d --register-dns --rdns-internal", verb);
+      fork_to_self (BSTR (&cmd));
+      gc_free (&gc);
+    }
+}
+
 void
 open_tun (const char *dev, const char *dev_type, const char *dev_node, bool ipv6, struct tuntap *tt)
 {

tun.h

@@ -99,6 +99,8 @@ struct tuntap_options {
   bool dhcp_renew;
   bool dhcp_pre_release;
   bool dhcp_release;
+
+  bool register_dns;
 };
 
 #elif TARGET_LINUX
@@ -335,6 +337,9 @@ void tun_show_debug (struct tuntap *tt);
 bool dhcp_release_by_adapter_index(const DWORD adapter_index);
 bool dhcp_renew_by_adapter_index (const DWORD adapter_index);
 
+void fork_register_dns_action (struct tuntap *tt);
+void ipconfig_register_dns (const struct env_set *es);
+
 void tun_standby_init (struct tuntap *tt);
 bool tun_standby (struct tuntap *tt);
 

version.m4

@@ -1,5 +1,5 @@
 dnl define the OpenVPN version
-define(PRODUCT_VERSION,[2.1.1l])
+define(PRODUCT_VERSION,[2.1.1m])
 dnl define the TAP version
 define(PRODUCT_TAP_ID,[tap0901])
 define(PRODUCT_TAP_WIN32_MIN_MAJOR,[9])

win32.c

@@ -971,10 +971,8 @@ openvpn_execve (const struct argv *a, const struct env_set *es, const unsigned i
 	      /* fill in STARTUPINFO struct */
 	      GetStartupInfo(&start_info);
 	      start_info.cb = sizeof(start_info);
-	      start_info.dwFlags = STARTF_USESTDHANDLES|STARTF_USESHOWWINDOW;
+	      start_info.dwFlags = STARTF_USESHOWWINDOW;
 	      start_info.wShowWindow = SW_HIDE;
-	      start_info.hStdInput = GetStdHandle(STD_INPUT_HANDLE);
-	      start_info.hStdOutput = start_info.hStdError = GetStdHandle(STD_OUTPUT_HANDLE);
 
 	      if (CreateProcess (cmd, cl, NULL, NULL, FALSE, 0, env, NULL, &start_info, &proc_info))
 		{
@@ -1042,10 +1040,8 @@ fork_to_self (const char *cmdline)
   /* fill in STARTUPINFO struct */
   GetStartupInfo(&start_info);
   start_info.cb = sizeof(start_info);
-  start_info.dwFlags = STARTF_USESTDHANDLES|STARTF_USESHOWWINDOW;
+  start_info.dwFlags = STARTF_USESHOWWINDOW;
   start_info.wShowWindow = SW_HIDE;
-  start_info.hStdInput = GetStdHandle(STD_INPUT_HANDLE);
-  start_info.hStdOutput = start_info.hStdError = GetStdHandle(STD_OUTPUT_HANDLE);
 
   if (CreateProcess (self_exe, cl, NULL, NULL, FALSE, 0, NULL, NULL, &start_info, &proc_info))
     {

win32.h

@@ -33,6 +33,7 @@
 #define DEFAULT_WIN_SYS_PATH  "C:\\WINDOWS" /* --win-sys default value */
 #define NETSH_PATH_SUFFIX     "\\system32\\netsh.exe"
 #define WIN_ROUTE_PATH_SUFFIX "\\system32\\route.exe"
+#define WIN_IPCONFIG_PATH_SUFFIX "\\system32\\ipconfig.exe"
 
 /*
  * Win32-specific OpenVPN code, targetted at the mingw