/*
  *  OpenVPN -- An application to securely tunnel IP networks
  *             over a single TCP/UDP port, with support for SSL/TLS-based
  *             session authentication and key exchange,
  *             packet encryption, packet authentication, and
  *             packet compression.
  *

  *  Copyright (C) 2002-2018 OpenVPN Inc <sales@openvpn.net>

  *
  *  This program is free software; you can redistribute it and/or modify
  *  it under the terms of the GNU General Public License version 2
  *  as published by the Free Software Foundation.
  *
  *  This program is distributed in the hope that it will be useful,
  *  but WITHOUT ANY WARRANTY; without even the implied warranty of
  *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  *  GNU General Public License for more details.
  *

  *  You should have received a copy of the GNU General Public License along
  *  with this program; if not, write to the Free Software Foundation, Inc.,
  *  51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.

  */
 

 #ifdef HAVE_CONFIG_H
 #include "config.h"
 #elif defined(_MSC_VER)
 #include "config-msvc.h"
 #endif
 

 #include "syshead.h"
 

 #ifdef ENABLE_SYSTEMD
 #include <systemd/sd-daemon.h>
 #endif
 

 #include "win32.h"
 #include "init.h"

 #include "run_command.h"

 #include "sig.h"
 #include "occ.h"
 #include "list.h"
 #include "otime.h"
 #include "pool.h"
 #include "gremlin.h"

 #include "pkcs11.h"

 #include "ps.h"

 #include "lladdr.h"

 #include "ping.h"

 #include "mstats.h"

 #include "ssl_verify.h"

 #include "tls_crypt.h"

 #include "forward-inline.h"

 
 #include "memdbg.h"
 
 #include "occ-inline.h"
 

 static struct context *static_context; /* GLOBAL */
 

 /*
  * Crypto initialization flags
  */
 #define CF_LOAD_PERSISTED_PACKET_ID (1<<0)
 #define CF_INIT_TLS_MULTI           (1<<1)
 #define CF_INIT_TLS_AUTH_STANDALONE (1<<2)
 

 static void do_init_first_time(struct context *c);

 
 void

 context_clear(struct context *c)

 {

     CLEAR(*c);

 }
 
 void

 context_clear_1(struct context *c)

 {

     CLEAR(c->c1);

 }
 
 void

 context_clear_2(struct context *c)

 {

     CLEAR(c->c2);

 }
 
 void

 context_clear_all_except_first_time(struct context *c)

 {

     const bool first_time_save = c->first_time;
     const struct context_persist cpsave = c->persist;
     context_clear(c);
     c->first_time = first_time_save;
     c->persist = cpsave;

 }
 
 /*

  * Pass tunnel endpoint and MTU parms to a user-supplied script.
  * Used to execute the up/down script/plugins.
  */
 static void
 run_up_down(const char *command,
             const struct plugin_list *plugins,
             int plugin_type,
             const char *arg,
 #ifdef _WIN32
             DWORD adapter_index,
 #endif
             const char *dev_type,
             int tun_mtu,
             int link_mtu,
             const char *ifconfig_local,
             const char *ifconfig_remote,
             const char *context,
             const char *signal_text,
             const char *script_type,
             struct env_set *es)
 {
     struct gc_arena gc = gc_new();
 
     if (signal_text)
     {
         setenv_str(es, "signal", signal_text);
     }
     setenv_str(es, "script_context", context);
     setenv_int(es, "tun_mtu", tun_mtu);
     setenv_int(es, "link_mtu", link_mtu);
     setenv_str(es, "dev", arg);
     if (dev_type)
     {
         setenv_str(es, "dev_type", dev_type);
     }
 #ifdef _WIN32
     setenv_int(es, "dev_idx", adapter_index);
 #endif
 
     if (!ifconfig_local)
     {
         ifconfig_local = "";
     }
     if (!ifconfig_remote)
     {
         ifconfig_remote = "";
     }
     if (!context)
     {
         context = "";
     }
 
     if (plugin_defined(plugins, plugin_type))
     {
         struct argv argv = argv_new();
         ASSERT(arg);
         argv_printf(&argv,
                     "%s %d %d %s %s %s",
                     arg,
                     tun_mtu, link_mtu,
                     ifconfig_local, ifconfig_remote,
                     context);
 
         if (plugin_call(plugins, plugin_type, &argv, NULL, es) != OPENVPN_PLUGIN_FUNC_SUCCESS)
         {
             msg(M_FATAL, "ERROR: up/down plugin call failed");
         }
 
         argv_reset(&argv);
     }
 
     if (command)
     {
         struct argv argv = argv_new();
         ASSERT(arg);
         setenv_str(es, "script_type", script_type);
         argv_parse_cmd(&argv, command);
         argv_printf_cat(&argv, "%s %d %d %s %s %s", arg, tun_mtu, link_mtu,
                         ifconfig_local, ifconfig_remote, context);
         argv_msg(M_INFO, &argv);
         openvpn_run_script(&argv, es, S_FATAL, "--up/--down");
         argv_reset(&argv);
     }
 
     gc_free(&gc);
 }
 
 /*

  * Should be called after options->ce is modified at the top
  * of a SIGUSR1 restart.

  */
 static void

 update_options_ce_post(struct options *options)

 {

 #if P2MP

     /*
      * In pull mode, we usually import --ping/--ping-restart parameters from
      * the server.  However we should also set an initial default --ping-restart
      * for the period of time before we pull the --ping-restart parameter
      * from the server.
      */
     if (options->pull
         && options->ping_rec_timeout_action == PING_UNDEF
         && proto_is_dgram(options->ce.proto))

     {

         options->ping_rec_timeout = PRE_PULL_INITIAL_PING_RESTART;
         options->ping_rec_timeout_action = PING_RESTART;

     }
 #endif
 }

 #ifdef ENABLE_MANAGEMENT

 static bool

 management_callback_proxy_cmd(void *arg, const char **p)

 {

     struct context *c = arg;
     struct connection_entry *ce = &c->options.ce;
     struct gc_arena *gc = &c->c2.gc;
     bool ret = false;

     update_time();
     if (streq(p[1], "NONE"))
     {
         ret = true;
     }
     else if (p[2] && p[3])

     {

         if (streq(p[1], "HTTP"))

         {

             struct http_proxy_options *ho;
             if (ce->proto != PROTO_TCP && ce->proto != PROTO_TCP_CLIENT)

             {

                 msg(M_WARN, "HTTP proxy support only works for TCP based connections");
                 return false;

             }

             ho = init_http_proxy_options_once(&ce->http_proxy_options, gc);
             ho->server = string_alloc(p[2], gc);
             ho->port = string_alloc(p[3], gc);
             ho->auth_retry = (p[4] && streq(p[4], "nct") ? PAR_NCT : PAR_ALL);
             ret = true;

         }

         else if (streq(p[1], "SOCKS"))

         {

             ce->socks_proxy_server = string_alloc(p[2], gc);

             ce->socks_proxy_port = string_alloc(p[3], gc);

             ret = true;

         }

     }

     else
     {
         msg(M_WARN, "Bad proxy command");
     }

     ce->flags &= ~CE_MAN_QUERY_PROXY;

     return ret;

 }
 
 static bool

 ce_management_query_proxy(struct context *c)
 {
     const struct connection_list *l = c->options.connection_list;
     struct connection_entry *ce = &c->options.ce;
     struct gc_arena gc;
     bool ret = true;
 
     update_time();
     if (management)
     {
         gc = gc_new();
         {
             struct buffer out = alloc_buf_gc(256, &gc);
             buf_printf(&out, ">PROXY:%u,%s,%s", (l ? l->current : 0) + 1,
                        (proto_is_udp(ce->proto) ? "UDP" : "TCP"), np(ce->remote));
             management_notify_generic(management, BSTR(&out));
         }
         ce->flags |= CE_MAN_QUERY_PROXY;
         while (ce->flags & CE_MAN_QUERY_PROXY)
         {
             management_event_loop_n_seconds(management, 1);
             if (IS_SIG(c))

             {

                 ret = false;
                 break;

             }
         }

         gc_free(&gc);

     }

     return ret;

 }
 
 

 static bool

 management_callback_remote_cmd(void *arg, const char **p)
 {
     struct context *c = (struct context *) arg;
     struct connection_entry *ce = &c->options.ce;
     int ret = false;
     if (p[1] && ((ce->flags>>CE_MAN_QUERY_REMOTE_SHIFT)&CE_MAN_QUERY_REMOTE_MASK) == CE_MAN_QUERY_REMOTE_QUERY)
     {
         int flags = 0;
         if (!strcmp(p[1], "ACCEPT"))
         {
             flags = CE_MAN_QUERY_REMOTE_ACCEPT;
             ret = true;
         }
         else if (!strcmp(p[1], "SKIP"))
         {
             flags = CE_MAN_QUERY_REMOTE_SKIP;
             ret = true;
         }
         else if (!strcmp(p[1], "MOD") && p[2] && p[3])
         {
             if (strlen(p[2]) < RH_HOST_LEN && strlen(p[3]) < RH_PORT_LEN)
             {
                 struct remote_host_store *rhs = c->options.rh_store;
                 if (!rhs)
                 {
                     ALLOC_OBJ_CLEAR_GC(rhs, struct remote_host_store, &c->options.gc);
                     c->options.rh_store = rhs;
                 }
                 strncpynt(rhs->host, p[2], RH_HOST_LEN);
                 strncpynt(rhs->port, p[3], RH_PORT_LEN);
 
                 ce->remote = rhs->host;
                 ce->remote_port = rhs->port;
                 flags = CE_MAN_QUERY_REMOTE_MOD;
                 ret = true;
             }
         }
         if (ret)
         {
             ce->flags &= ~(CE_MAN_QUERY_REMOTE_MASK<<CE_MAN_QUERY_REMOTE_SHIFT);
             ce->flags |= ((flags&CE_MAN_QUERY_REMOTE_MASK)<<CE_MAN_QUERY_REMOTE_SHIFT);
         }
     }
     return ret;

 }
 
 static bool

 ce_management_query_remote(struct context *c)
 {
     struct gc_arena gc = gc_new();
     volatile struct connection_entry *ce = &c->options.ce;

     int ce_changed = true; /* presume the connection entry will be changed */
 

     update_time();
     if (management)
     {
         struct buffer out = alloc_buf_gc(256, &gc);

 
         buf_printf(&out, ">REMOTE:%s,%s,%s", np(ce->remote), ce->remote_port,
                    proto2ascii(ce->proto, ce->af, false));

         management_notify_generic(management, BSTR(&out));

 
         ce->flags &= ~(CE_MAN_QUERY_REMOTE_MASK << CE_MAN_QUERY_REMOTE_SHIFT);
         ce->flags |= (CE_MAN_QUERY_REMOTE_QUERY << CE_MAN_QUERY_REMOTE_SHIFT);
         while (((ce->flags >> CE_MAN_QUERY_REMOTE_SHIFT)
                 & CE_MAN_QUERY_REMOTE_MASK) == CE_MAN_QUERY_REMOTE_QUERY)

         {
             management_event_loop_n_seconds(management, 1);
             if (IS_SIG(c))
             {

                 ce_changed = false; /* connection entry have not been set */

                 break;
             }
         }
     }

     gc_free(&gc);
 
     if (ce_changed)

     {

         /* If it is likely a connection entry was modified,
          * check what changed in the flags and that it was not skipped
          */
         const int flags = ((ce->flags >> CE_MAN_QUERY_REMOTE_SHIFT)
                            & CE_MAN_QUERY_REMOTE_MASK);
         ce_changed = (flags != CE_MAN_QUERY_REMOTE_SKIP);

     }

     return ce_changed;

 }

 #endif /* ENABLE_MANAGEMENT */

 /*
  * Initialize and possibly randomize connection list.
  */
 static void

 init_connection_list(struct context *c)

 {

     struct connection_list *l = c->options.connection_list;

     l->current = -1;
     if (c->options.remote_random)

     {

         int i;
         for (i = 0; i < l->len; ++i)

         {

             const int j = get_random() % l->len;
             if (i != j)

             {

                 struct connection_entry *tmp;
                 tmp = l->array[i];
                 l->array[i] = l->array[j];
                 l->array[j] = tmp;

             }
         }

     }

 }
 
 /*

  * Clear the remote address list
  */

 static void
 clear_remote_addrlist(struct link_socket_addr *lsa, bool free)

 {

     if (lsa->remote_list && free)

     {
         freeaddrinfo(lsa->remote_list);
     }

     lsa->remote_list = NULL;
     lsa->current_remote = NULL;
 }
 
 /*

  * Increment to next connection entry
  */
 static void

 next_connection_entry(struct context *c)
 {
     struct connection_list *l = c->options.connection_list;
     bool ce_defined;
     struct connection_entry *ce;
     int n_cycles = 0;
 

     do
     {

         ce_defined = true;
         if (c->options.no_advance && l->current >= 0)
         {
             c->options.no_advance = false;
         }

         else

         {
             /* Check if there is another resolved address to try for
              * the current connection */
             if (c->c1.link_socket_addr.current_remote
                 && c->c1.link_socket_addr.current_remote->ai_next)
             {

                 c->c1.link_socket_addr.current_remote =

                     c->c1.link_socket_addr.current_remote->ai_next;
             }
             else
             {
                 /* FIXME (schwabe) fix the persist-remote-ip option for real,
                  * this is broken probably ever since connection lists and multiple
                  * remote existed
                  */
                 if (!c->options.persist_remote_ip)
                 {
                     /* close_instance should have cleared the addrinfo objects */
                     ASSERT(c->c1.link_socket_addr.current_remote == NULL);
                     ASSERT(c->c1.link_socket_addr.remote_list == NULL);
                 }
                 else
                 {
                     c->c1.link_socket_addr.current_remote =
                         c->c1.link_socket_addr.remote_list;
                 }
 
                 /*
                  * Increase the number of connection attempts
                  * If this is connect-retry-max * size(l)
                  * OpenVPN will quit
                  */
 
                 c->options.unsuccessful_attempts++;
 
                 if (++l->current >= l->len)
                 {
 
                     l->current = 0;
                     if (++n_cycles >= 2)
                     {
                         msg(M_FATAL, "No usable connection profiles are present");
                     }
                 }
             }
         }

         ce = l->array[l->current];

         if (ce->flags & CE_DISABLED)
         {
             ce_defined = false;
         }

         c->options.ce = *ce;

 #ifdef ENABLE_MANAGEMENT

         if (ce_defined && management && management_query_remote_enabled(management))
         {
             /* allow management interface to override connection entry details */
             ce_defined = ce_management_query_remote(c);
             if (IS_SIG(c))
             {
                 break;
             }
         }

         else if (ce_defined && management && management_query_proxy_enabled(management))

         {

             ce_defined = ce_management_query_proxy(c);
             if (IS_SIG(c))
             {
                 break;
             }

         }

 #endif

     } while (!ce_defined);

     /* Check if this connection attempt would bring us over the limit */
     if (c->options.connect_retry_max > 0
         && c->options.unsuccessful_attempts > (l->len  * c->options.connect_retry_max))
     {
         msg(M_FATAL, "All connections have been connect-retry-max (%d) times unsuccessful, exiting",
             c->options.connect_retry_max);
     }
     update_options_ce_post(&c->options);

 }
 

 /*
  * Query for private key and auth-user-pass username/passwords
  */

 void

 init_query_passwords(const struct context *c)

 {

     /* Certificate password input */
     if (c->options.key_pass_file)
     {
         pem_password_setup(c->options.key_pass_file);
     }
 

 #if P2MP

     /* Auth user/pass input */
     if (c->options.auth_user_pass_file)

     {
 #ifdef ENABLE_CLIENT_CR

         auth_user_pass_setup(c->options.auth_user_pass_file, &c->options.sc_info);

 #else

         auth_user_pass_setup(c->options.auth_user_pass_file, NULL);

 #endif
     }

 #endif
 }
 

 /*
  * Initialize/Uninitialize HTTP or SOCKS proxy
  */
 
 static void

 uninit_proxy_dowork(struct context *c)

 {

     if (c->c1.http_proxy_owned && c->c1.http_proxy)

     {

         http_proxy_close(c->c1.http_proxy);
         c->c1.http_proxy = NULL;
         c->c1.http_proxy_owned = false;

     }

     if (c->c1.socks_proxy_owned && c->c1.socks_proxy)

     {

         socks_proxy_close(c->c1.socks_proxy);
         c->c1.socks_proxy = NULL;
         c->c1.socks_proxy_owned = false;

     }
 }
 
 static void

 init_proxy_dowork(struct context *c)

 {

     bool did_http = false;

     uninit_proxy_dowork(c);

     if (c->options.ce.http_proxy_options)

     {

         /* Possible HTTP proxy user/pass input */
         c->c1.http_proxy = http_proxy_new(c->options.ce.http_proxy_options);
         if (c->c1.http_proxy)
         {
             did_http = true;
             c->c1.http_proxy_owned = true;
         }

     }
 

     if (!did_http && c->options.ce.socks_proxy_server)

     {

         c->c1.socks_proxy = socks_proxy_new(c->options.ce.socks_proxy_server,
                                             c->options.ce.socks_proxy_port,
                                             c->options.ce.socks_proxy_authfile);
         if (c->c1.socks_proxy)
         {
             c->c1.socks_proxy_owned = true;
         }

     }
 }
 
 static void

 init_proxy(struct context *c)

 {

     init_proxy_dowork(c);

 }
 
 static void

 uninit_proxy(struct context *c)

 {

     uninit_proxy_dowork(c);

 }
 
 void

 context_init_1(struct context *c)

 {

     context_clear_1(c);

     packet_id_persist_init(&c->c1.pid_persist);

     init_connection_list(c);

 #if defined(ENABLE_PKCS11)

     if (c->first_time)
     {
         int i;
         pkcs11_initialize(true, c->options.pkcs11_pin_cache_period);
         for (i = 0; i<MAX_PARMS && c->options.pkcs11_providers[i] != NULL; i++)

         {

             pkcs11_addProvider(c->options.pkcs11_providers[i], c->options.pkcs11_protected_authentication[i],
                                c->options.pkcs11_private_mode[i], c->options.pkcs11_cert_private[i]);

         }

     }

 #endif

 #if 0 /* test get_user_pass with GET_USER_PASS_NEED_OK flag */

     {
         /*
          * In the management interface, you can okay the request by entering "needok token-insertion-request ok"
          */
         struct user_pass up;
         CLEAR(up);
         strcpy(up.username, "Please insert your cryptographic token"); /* put the high-level message in up.username */
         get_user_pass(&up, NULL, "token-insertion-request", GET_USER_PASS_MANAGEMENT|GET_USER_PASS_NEED_OK);
         msg(M_INFO, "RET:%s", up.password); /* will return the third argument to management interface
                                              * 'needok' command, usually 'ok' or 'cancel'. */
     }

 #endif
 

 #ifdef ENABLE_SYSTEMD
     /* We can report the PID via getpid() to systemd here as OpenVPN will not
      * do any fork due to daemon() a future call.
      * See possibly_become_daemon() [init.c] for more details.
      */

     sd_notifyf(0, "READY=1\nSTATUS=Pre-connection initialization successful\nMAINPID=%lu",

                (unsigned long) getpid());
 #endif
 

 }
 
 void

 context_gc_free(struct context *c)

 {

     gc_free(&c->c2.gc);
     gc_free(&c->options.gc);
     gc_free(&c->gc);

 }
 

 #if PORT_SHARE
 
 static void

 close_port_share(void)

 {

     if (port_share)

     {

         port_share_close(port_share);
         port_share = NULL;

     }
 }
 
 static void

 init_port_share(struct context *c)

 {

     if (!port_share && (c->options.port_share_host && c->options.port_share_port))

     {

         port_share = port_share_open(c->options.port_share_host,
                                      c->options.port_share_port,
                                      MAX_RW_SIZE_LINK(&c->c2.frame),
                                      c->options.port_share_journal_dir);
         if (port_share == NULL)
         {
             msg(M_FATAL, "Fatal error: Port sharing failed");
         }

     }
 }
 

 #endif /* if PORT_SHARE */

 bool

 init_static(void)

 {

     /* configure_path (); */

 #if defined(DMALLOC)

     crypto_init_dmalloc();

 #endif
 

 
     /*
      * Initialize random number seed.  random() is only used
      * when "weak" random numbers are acceptable.
      * SSL library routines are always used when cryptographically
      * strong random numbers are required.
      */
     struct timeval tv;
     if (!gettimeofday(&tv, NULL))
     {
         const unsigned int seed = (unsigned int) tv.tv_sec ^ tv.tv_usec;
         srandom(seed);
     }
 

     error_reset();              /* initialize error.c */
     reset_check_status();       /* initialize status check code in socket.c */

 #ifdef _WIN32

     init_win32();

 #endif
 
 #ifdef OPENVPN_DEBUG_COMMAND_LINE

     {
         int i;
         for (i = 0; i < argc; ++i)

         {

             msg(M_INFO, "argv[%d] = '%s'", i, argv[i]);

         }

     }

 #endif
 

     update_time();

     init_ssl_lib();

     /* init PRNG used for IV generation */
     /* When forking, copy this to more places in the code to avoid fork
      * random-state predictability */
     prng_init(NULL, 0);

 
 #ifdef PID_TEST

     packet_id_interactive_test();       /* test the sequence number code */
     return false;

 #endif
 
 #ifdef SCHEDULE_TEST

     schedule_test();
     return false;

 #endif
 
 #ifdef LIST_TEST

     list_test();
     return false;

 #endif
 
 #ifdef IFCONFIG_POOL_TEST

     ifconfig_pool_test(0x0A010004, 0x0A0100FF);
     return false;

 #endif
 
 #ifdef CHARACTER_CLASS_DEBUG

     character_class_debug();
     return false;

 #endif
 
 #ifdef EXTRACT_X509_FIELD_TEST

     extract_x509_field_test();
     return false;

 #endif
 

 #ifdef TIME_TEST

     time_test();
     return false;

 #endif
 

 #ifdef TEST_GET_DEFAULT_GATEWAY

     {
         struct route_gateway_info rgi;
         struct route_ipv6_gateway_info rgi6;
         get_default_gateway(&rgi);
         get_default_gateway_ipv6(&rgi6, NULL);
         print_default_gateway(M_INFO, &rgi, &rgi6);
         return false;
     }

 #endif
 

 #ifdef GEN_PATH_TEST

     {
         struct gc_arena gc = gc_new();
         const char *fn = gen_path("foo",
                                   "bar",
                                   &gc);
         printf("%s\n", fn);
         gc_free(&gc);
     }
     return false;

 #endif

 #ifdef STATUS_PRINTF_TEST

     {
         struct gc_arena gc = gc_new();

         const char *tmp_file = platform_create_temp_file("/tmp", "foo", &gc);

         struct status_output *so = status_open(tmp_file, 0, -1, NULL, STATUS_OUTPUT_WRITE);
         status_printf(so, "%s", "foo");
         status_printf(so, "%s", "bar");
         if (!status_close(so))
         {
             msg(M_WARN, "STATUS_PRINTF_TEST: %s: write error", tmp_file);
         }
         gc_free(&gc);
     }
     return false;

 #endif
 

 #ifdef ARGV_TEST

     {
         void argv_test(void);
 
         argv_test();
         return false;
     }

 #endif
 

 #ifdef PRNG_TEST

     {
         struct gc_arena gc = gc_new();
         uint8_t rndbuf[8];
         int i;
         prng_init("sha1", 16);
         /*prng_init (NULL, 0);*/
         const int factor = 1;
         for (i = 0; i < factor * 8; ++i)
         {

 #if 1

             prng_bytes(rndbuf, sizeof(rndbuf));

 #else

             ASSERT(rand_bytes(rndbuf, sizeof(rndbuf)));

 #endif

             printf("[%d] %s\n", i, format_hex(rndbuf, sizeof(rndbuf), 0, &gc));
         }
         gc_free(&gc);
         prng_uninit();
         return false;
     }
 #endif /* ifdef PRNG_TEST */

 #ifdef BUFFER_LIST_AGGREGATE_TEST

     /* test buffer_list_aggregate function */
     {
         static const char *text[] = {
             "It was a bright cold day in April, ",
             "and the clocks were striking ",
             "thirteen. ",
             "Winston Smith, ",
             "his chin nuzzled into his breast in an ",
             "effort to escape the vile wind, ",
             "slipped quickly through the glass doors ",
             "of Victory Mansions, though not quickly ",
             "enough to prevent a swirl of gritty dust from ",
             "entering along with him."
         };
 
         int iter, listcap;
         for (listcap = 0; listcap < 12; ++listcap)
         {
             for (iter = 0; iter < 512; ++iter)
             {
                 struct buffer_list *bl = buffer_list_new(listcap);
                 {
                     int i;
                     for (i = 0; i < SIZE(text); ++i)

                     {

                         buffer_list_push(bl, (unsigned char *)text[i]);

                     }

                 }
                 printf("[cap=%d i=%d] *************************\n", listcap, iter);
                 if (!(iter & 8))
                 {
                     buffer_list_aggregate(bl, iter/2);
                 }
                 if (!(iter & 16))
                 {
                     buffer_list_push(bl, (unsigned char *)"Even more text...");
                 }
                 buffer_list_aggregate(bl, iter);
                 if (!(iter & 1))
                 {
                     buffer_list_push(bl, (unsigned char *)"More text...");
                 }
                 {
                     struct buffer *buf;
                     while ((buf = buffer_list_peek(bl)))
                     {
                         int c;
                         printf("'");
                         while ((c = buf_read_u8(buf)) >= 0)

                         {

                             putchar(c);

                         }

                         printf("'\n");
                         buffer_list_advance(bl, 0);
                     }
                 }
                 buffer_list_free(bl);
             }
         }
         return false;
     }
 #endif /* ifdef BUFFER_LIST_AGGREGATE_TEST */

 #ifdef MSTATS_TEST

     {
         int i;
         mstats_open("/dev/shm/mstats.dat");
         for (i = 0; i < 30; ++i)
         {
             mmap_stats->n_clients += 1;
             mmap_stats->link_write_bytes += 8;
             mmap_stats->link_read_bytes += 16;
             sleep(1);
         }
         mstats_close();
         return false;
     }

 #endif
 

     return true;

 }
 
 void

 uninit_static(void)

 {

     free_ssl_lib();

 
 #ifdef ENABLE_PKCS11

     pkcs11_terminate();

 #endif

 #if PORT_SHARE

     close_port_share();

 #endif
 

 #if defined(MEASURE_TLS_HANDSHAKE_STATS)

     show_tls_performance_stats();

 #endif
 }
 
 void

 init_verb_mute(struct context *c, unsigned int flags)

 {

     if (flags & IVM_LEVEL_1)

     {

         /* set verbosity and mute levels */
         set_check_status(D_LINK_ERRORS, D_READ_WRITE);
         set_debug_level(c->options.verbosity, SDL_CONSTRAIN);
         set_mute_cutoff(c->options.mute);

     }
 

     /* special D_LOG_RW mode */
     if (flags & IVM_LEVEL_2)
     {
         c->c2.log_rw = (check_debug_level(D_LOG_RW) && !check_debug_level(D_LOG_RW + 1));
     }

 }
 
 /*
  * Possibly set --dev based on --dev-node.
  * For example, if --dev-node /tmp/foo/tun, and --dev undefined,
  * set --dev to tun.
  */
 void

 init_options_dev(struct options *options)

 {

     if (!options->dev && options->dev_node)
     {
         char *dev_node = string_alloc(options->dev_node, NULL); /* POSIX basename() implementaions may modify its arguments */
         options->dev = basename(dev_node);
     }

 }
 
 bool

 print_openssl_info(const struct options *options)

 {

     /*
      * OpenSSL info print mode?
      */
     if (options->show_ciphers || options->show_digests || options->show_engines
         || options->show_tls_ciphers || options->show_curves)

     {

         if (options->show_ciphers)
         {
             show_available_ciphers();
         }
         if (options->show_digests)
         {
             show_available_digests();
         }
         if (options->show_engines)
         {
             show_available_engines();
         }
         if (options->show_tls_ciphers)
         {

             show_available_tls_ciphers(options->cipher_list,
                                        options->tls_cert_profile);

         }
         if (options->show_curves)
         {
             show_available_curves();
         }
         return true;

     }

     return false;

 }
 
 /*
  * Static pre-shared key generation mode?
  */
 bool

 do_genkey(const struct options *options)

 {

     if (options->genkey)

     {

         int nbits_written;

         notnull(options->shared_secret_file,
                 "shared secret output file (--secret)");

         if (options->mlock)     /* should we disable paging? */
         {
             platform_mlockall(true);
         }

         nbits_written = write_key_file(2, options->shared_secret_file);

         msg(D_GENKEY | M_NOPREFIX,
             "Randomly generated %d bit key written to %s", nbits_written,
             options->shared_secret_file);
         return true;

     }

     return false;

 }
 
 /*
  * Persistent TUN/TAP device management mode?
  */
 bool

 do_persist_tuntap(const struct options *options)

 {

     if (options->persist_config)

     {

         /* sanity check on options for --mktun or --rmtun */
         notnull(options->dev, "TUN/TAP device (--dev)");
         if (options->ce.remote || options->ifconfig_local
             || options->ifconfig_remote_netmask
             || options->shared_secret_file
             || options->tls_server || options->tls_client
             )
         {
             msg(M_FATAL|M_OPTERR,
                 "options --mktun or --rmtun should only be used together with --dev");
         }

 #ifdef ENABLE_FEATURE_TUN_PERSIST

         tuncfg(options->dev, options->dev_type, options->dev_node,
                options->persist_mode,
                options->username, options->groupname, &options->tuntap_options);
         if (options->persist_mode && options->lladdr)
         {
             set_lladdr(options->dev, options->lladdr, NULL);
         }
         return true;
 #else  /* ifdef ENABLE_FEATURE_TUN_PERSIST */
         msg( M_FATAL|M_OPTERR,
              "options --mktun and --rmtun are not available on your operating "
              "system.  Please check 'man tun' (or 'tap'), whether your system "
              "supports using 'ifconfig %s create' / 'destroy' to create/remove "
              "persistant tunnel interfaces.", options->dev );

 #endif

     }

     return false;

 }
 
 /*
  * Should we become a daemon?
  * Return true if we did it.
  */

 bool

 possibly_become_daemon(const struct options *options)

 {

     bool ret = false;

 
 #ifdef ENABLE_SYSTEMD

     /* return without forking if we are running from systemd */
     if (sd_notify(0, "READY=0") > 0)
     {
         return ret;
     }

 #endif
 

     if (options->daemon)

     {

         ASSERT(!options->inetd);
         /* Don't chdir immediately, but the end of the init sequence, if needed */
         if (daemon(1, options->log) < 0)
         {
             msg(M_ERR, "daemon() failed or unsupported");
         }
         restore_signal_state();
         if (options->log)
         {
             set_std_files_to_null(true);
         }

         ret = true;

     }

     return ret;

 }
 
 /*

  * Actually do UID/GID downgrade, chroot and SELinux context switching, if requested.

  */
 static void

 do_uid_gid_chroot(struct context *c, bool no_delay)

 {

     static const char why_not[] = "will be delayed because of --client, --pull, or --up-delay";
     struct context_0 *c0 = c->c0;

     if (c0 && !c0->uid_gid_chroot_set)

     {

         /* chroot if requested */
         if (c->options.chroot_dir)
         {
             if (no_delay)

             {

                 platform_chroot(c->options.chroot_dir);
             }
             else if (c->first_time)
             {
                 msg(M_INFO, "NOTE: chroot %s", why_not);
             }
         }
 
         /* set user and/or group if we want to setuid/setgid */
         if (c0->uid_gid_specified)
         {
             if (no_delay)
             {
                 platform_group_set(&c0->platform_state_group);
                 platform_user_set(&c0->platform_state_user);

             }

             else if (c->first_time)
             {
                 msg(M_INFO, "NOTE: UID/GID downgrade %s", why_not);
             }
         }

 #ifdef ENABLE_MEMSTATS

         if (c->first_time && c->options.memstats_fn)
         {
             mstats_open(c->options.memstats_fn);
         }

 #endif
 

 #ifdef ENABLE_SELINUX

         /* Apply a SELinux context in order to restrict what OpenVPN can do
          * to _only_ what it is supposed to do after initialization is complete
          * (basically just network I/O operations). Doing it after chroot
          * requires /proc to be mounted in the chroot (which is annoying indeed
          * but doing it before requires more complex SELinux policies.
          */
         if (c->options.selinux_context)
         {
             if (no_delay)
             {
                 if (-1 == setcon(c->options.selinux_context))
                 {
                     msg(M_ERR, "setcon to '%s' failed; is /proc accessible?", c->options.selinux_context);
                 }
                 else
                 {
                     msg(M_INFO, "setcon to '%s' succeeded", c->options.selinux_context);
                 }
             }
             else if (c->first_time)
             {
                 msg(M_INFO, "NOTE: setcon %s", why_not);
             }
         }
 #endif
 
         /* Privileges are going to be dropped by now (if requested), be sure
          * to prevent any future privilege dropping attempts from now on.
          */
         if (no_delay)
         {
             c0->uid_gid_chroot_set = true;
         }

     }
 }
 
 /*
  * Return common name in a way that is formatted for
  * prepending to msg() output.
  */
 const char *

 format_common_name(struct context *c, struct gc_arena *gc)

 {

     struct buffer out = alloc_buf_gc(256, gc);
     if (c->c2.tls_multi)

     {

         buf_printf(&out, "[%s] ", tls_common_name(c->c2.tls_multi, false));

     }

     return BSTR(&out);

 }
 
 void

 pre_setup(const struct options *options)

 {

 #ifdef _WIN32

     if (options->exit_event_name)

     {

         win32_signal_open(&win32_signal,
                           WSO_FORCE_SERVICE,
                           options->exit_event_name,
                           options->exit_event_initial_state);

     }

     else

     {

         win32_signal_open(&win32_signal,
                           WSO_FORCE_CONSOLE,
                           NULL,
                           false);

         /* put a title on the top window bar */
         if (win32_signal.mode == WSO_MODE_CONSOLE)
         {
             window_title_save(&window_title);
             window_title_generate(options->config);
         }

     }

 #endif /* ifdef _WIN32 */

 }
 
 void

 reset_coarse_timers(struct context *c)

 {

     c->c2.coarse_timer_wakeup = 0;

 }
 
 /*

  * Initialise the server poll timeout timer
  * This timer is used in the http/socks proxy setup so it needs to be setup
  * before
  */
 static void

 do_init_server_poll_timeout(struct context *c)

 {

     update_time();

     if (c->options.ce.connect_timeout)

     {
         event_timeout_init(&c->c2.server_poll_interval, c->options.ce.connect_timeout, now);
     }

 }
 
 /*

  * Initialize timers
  */
 static void

 do_init_timers(struct context *c, bool deferred)

 {

     update_time();
     reset_coarse_timers(c);

     /* initialize inactivity timeout */
     if (c->options.inactivity_timeout)
     {
         event_timeout_init(&c->c2.inactivity_interval, c->options.inactivity_timeout, now);
     }

     /* initialize pings */

     if (c->options.ping_send_timeout)
     {
         event_timeout_init(&c->c2.ping_send_interval, c->options.ping_send_timeout, 0);
     }

     if (c->options.ping_rec_timeout)
     {
         event_timeout_init(&c->c2.ping_rec_interval, c->options.ping_rec_timeout, now);
     }

     if (!deferred)

     {

         /* initialize connection establishment timer */
         event_timeout_init(&c->c2.wait_for_connect, 1, now);

 
 #ifdef ENABLE_OCC

         /* initialize occ timers */

         if (c->options.occ
             && !TLS_MODE(c)
             && c->c2.options_string_local && c->c2.options_string_remote)
         {
             event_timeout_init(&c->c2.occ_interval, OCC_INTERVAL_SECONDS, now);
         }

         if (c->options.mtu_test)
         {
             event_timeout_init(&c->c2.occ_mtu_load_test_interval, OCC_MTU_LOAD_INTERVAL_SECONDS, now);
         }

 #endif
 

         /* initialize packet_id persistence timer */
         if (c->options.packet_id_file)
         {
             event_timeout_init(&c->c2.packet_id_persist_interval, 60, now);
         }

         /* initialize tmp_int optimization that limits the number of times we call
          * tls_multi_process in the main event loop */
         interval_init(&c->c2.tmp_int, TLS_MULTI_HORIZON, TLS_MULTI_REFRESH);

     }
 }
 
 /*
  * Initialize traffic shaper.
  */
 static void

 do_init_traffic_shaper(struct context *c)

 {

 #ifdef ENABLE_FEATURE_SHAPER

     /* initialize traffic shaper (i.e. transmit bandwidth limiter) */
     if (c->options.shaper)

     {

         shaper_init(&c->c2.shaper, c->options.shaper);
         shaper_msg(&c->c2.shaper);

     }
 #endif
 }
 
 /*

  * Allocate route list structures for IPv4 and IPv6
  * (we do this for IPv4 even if no --route option has been seen, as other
  * parts of OpenVPN might want to fill the route-list with info, e.g. DHCP)

  */
 static void

 do_alloc_route_list(struct context *c)

 {

     if (!c->c1.route_list)
     {
         ALLOC_OBJ_CLEAR_GC(c->c1.route_list, struct route_list, &c->gc);
     }
     if (c->options.routes_ipv6 && !c->c1.route_ipv6_list)
     {
         ALLOC_OBJ_CLEAR_GC(c->c1.route_ipv6_list, struct route_ipv6_list, &c->gc);
     }

 }
 
 
 /*
  * Initialize the route list, resolving any DNS names in route
  * options and saving routes in the environment.
  */
 static void

 do_init_route_list(const struct options *options,
                    struct route_list *route_list,
                    const struct link_socket_info *link_socket_info,
                    struct env_set *es)

 {

     const char *gw = NULL;
     int dev = dev_type_enum(options->dev, options->dev_type);
     int metric = 0;

     if (dev == DEV_TYPE_TUN && (options->topology == TOP_NET30 || options->topology == TOP_P2P))
     {
         gw = options->ifconfig_remote_netmask;
     }
     if (options->route_default_gateway)
     {
         gw = options->route_default_gateway;
     }
     if (options->route_default_metric)
     {
         metric = options->route_default_metric;
     }

     if (init_route_list(route_list,
                         options->routes,
                         gw,
                         metric,
                         link_socket_current_remote(link_socket_info),
                         es))

     {

         /* copy routes to environment */
         setenv_routes(es, route_list);

     }
 }
 

 static void

 do_init_route_ipv6_list(const struct options *options,
                         struct route_ipv6_list *route_ipv6_list,
                         const struct link_socket_info *link_socket_info,
                         struct env_set *es)

 {

     const char *gw = NULL;
     int metric = -1;            /* no metric set */

     gw = options->ifconfig_ipv6_remote;         /* default GW = remote end */
 #if 0                                   /* not yet done for IPv6 - TODO!*/
     if (options->route_ipv6_default_gateway)            /* override? */
     {
         gw = options->route_ipv6_default_gateway;
     }

 #endif
 

     if (options->route_default_metric)
     {
         metric = options->route_default_metric;
     }

     /* redirect (IPv6) gateway to VPN?  if yes, add a few more specifics
      */
     if (options->routes_ipv6->flags & RG_REROUTE_GW)

     {

         char *opt_list[] = { "::/3", "2000::/4", "3000::/4", "fc00::/7", NULL };
         int i;

         for (i = 0; opt_list[i]; i++)
         {
             add_route_ipv6_to_option_list( options->routes_ipv6,
                                            string_alloc(opt_list[i], options->routes_ipv6->gc),
                                            NULL, NULL );
         }

     }
 

     if (init_route_ipv6_list(route_ipv6_list,
                              options->routes_ipv6,
                              gw,
                              metric,
                              link_socket_current_remote_ipv6(link_socket_info),
                              es))

     {

         /* copy routes to environment */
         setenv_routes_ipv6(es, route_ipv6_list);

     }
 }
 
 

 /*
  * Called after all initialization has been completed.
  */
 void

 initialization_sequence_completed(struct context *c, const unsigned int flags)

 {

     static const char message[] = "Initialization Sequence Completed";

     /* Reset the unsuccessful connection counter on complete initialisation */
     c->options.unsuccessful_attempts = 0;

     /* If we delayed UID/GID downgrade or chroot, do it now */
     do_uid_gid_chroot(c, true);

     /*
      * In some cases (i.e. when receiving auth-token via
      * push-reply) the auth-nocache option configured on the
      * client is overridden; for this reason we have to wait
      * for the push-reply message before attempting to wipe
      * the user/pass entered by the user
      */
     if (c->options.mode == MODE_POINT_TO_POINT)
     {
         delayed_auth_pass_purge();
     }
 

     /* Test if errors */
     if (flags & ISC_ERRORS)

     {

 #ifdef _WIN32

         show_routes(M_INFO|M_NOPREFIX);
         show_adapters(M_INFO|M_NOPREFIX);
         msg(M_INFO, "%s With Errors ( see http://openvpn.net/faq.html#dhcpclientserv )", message);

 #else

 #ifdef ENABLE_SYSTEMD

         sd_notifyf(0, "STATUS=Failed to start up: %s With Errors\nERRNO=1", message);

 #endif /* HAVE_SYSTEMD_SD_DAEMON_H */

         msg(M_INFO, "%s With Errors", message);

 #endif

     }

     else

     {
 #ifdef ENABLE_SYSTEMD

         sd_notifyf(0, "STATUS=%s", message);

 #endif

         msg(M_INFO, "%s", message);

     }

     /* Flag that we initialized */
     if ((flags & (ISC_ERRORS|ISC_SERVER)) == 0)
     {
         c->options.no_advance = true;
     }

 #ifdef _WIN32

     fork_register_dns_action(c->c1.tuntap);

 #endif
 

 #ifdef ENABLE_MANAGEMENT

     /* Tell management interface that we initialized */
     if (management)
     {
         in_addr_t *tun_local = NULL;
         struct in6_addr *tun_local6 = NULL;
         struct openvpn_sockaddr local, remote;
         struct link_socket_actual *actual;
         socklen_t sa_len = sizeof(local);
         const char *detail = "SUCCESS";
         if (flags & ISC_ERRORS)
         {
             detail = "ERROR";
         }
 
         CLEAR(local);
         actual = &get_link_socket_info(c)->lsa->actual;
         remote = actual->dest;
         getsockname(c->c2.link_socket->sd, &local.addr.sa, &sa_len);

 #if ENABLE_IP_PKTINFO

         if (!addr_defined(&local))

         {

             switch (local.addr.sa.sa_family)

             {

                 case AF_INET:

 #if defined(HAVE_IN_PKTINFO) && defined(HAVE_IPI_SPEC_DST)

                     local.addr.in4.sin_addr = actual->pi.in4.ipi_spec_dst;

 #else

                     local.addr.in4.sin_addr = actual->pi.in4;

 #endif

                     break;
 
                 case AF_INET6:
                     local.addr.in6.sin6_addr = actual->pi.in6.ipi6_addr;
                     break;

             }
         }
 #endif
 

         if (c->c1.tuntap)

         {

             tun_local = &c->c1.tuntap->local;
             tun_local6 = &c->c1.tuntap->local_ipv6;
         }
         management_set_state(management,
                              OPENVPN_STATE_CONNECTED,
                              detail,
                              tun_local,
                              tun_local6,
                              &local,
                              &remote);
         if (tun_local)
         {
             management_post_tunnel_open(management, *tun_local);

         }

     }

 #endif /* ifdef ENABLE_MANAGEMENT */

 }
 
 /*
  * Possibly add routes and/or call route-up script
  * based on options.
  */
 void

 do_route(const struct options *options,
          struct route_list *route_list,
          struct route_ipv6_list *route_ipv6_list,
          const struct tuntap *tt,
          const struct plugin_list *plugins,
          struct env_set *es)

 {

     if (!options->route_noexec && ( route_list || route_ipv6_list ) )

     {

         add_routes(route_list, route_ipv6_list, tt, ROUTE_OPTION_FLAGS(options), es);
         setenv_int(es, "redirect_gateway", route_did_redirect_default_gateway(route_list));

     }
 #ifdef ENABLE_MANAGEMENT

     if (management)
     {
         management_up_down(management, "UP", es);
     }

 #endif

     if (plugin_defined(plugins, OPENVPN_PLUGIN_ROUTE_UP))

     {

         if (plugin_call(plugins, OPENVPN_PLUGIN_ROUTE_UP, NULL, NULL, es) != OPENVPN_PLUGIN_FUNC_SUCCESS)
         {
             msg(M_WARN, "WARNING: route-up plugin call failed");
         }

     }
 

     if (options->route_script)

     {

         struct argv argv = argv_new();
         setenv_str(es, "script_type", "route-up");
         argv_parse_cmd(&argv, options->route_script);
         openvpn_run_script(&argv, es, 0, "--route-up");
         argv_reset(&argv);

     }
 

 #ifdef _WIN32

     if (options->show_net_up)

     {

         show_routes(M_INFO|M_NOPREFIX);
         show_adapters(M_INFO|M_NOPREFIX);

     }

     else if (check_debug_level(D_SHOW_NET))

     {

         show_routes(D_SHOW_NET|M_NOPREFIX);
         show_adapters(D_SHOW_NET|M_NOPREFIX);

     }
 #endif
 }
 
 /*
  * initialize tun/tap device object
  */
 static void

 do_init_tun(struct context *c)

 {

     c->c1.tuntap = init_tun(c->options.dev,
                             c->options.dev_type,
                             c->options.topology,
                             c->options.ifconfig_local,
                             c->options.ifconfig_remote_netmask,
                             c->options.ifconfig_ipv6_local,
                             c->options.ifconfig_ipv6_netbits,
                             c->options.ifconfig_ipv6_remote,
                             c->c1.link_socket_addr.bind_local,
                             c->c1.link_socket_addr.remote_list,
                             !c->options.ifconfig_nowarn,
                             c->c2.es);
 
     init_tun_post(c->c1.tuntap,
                   &c->c2.frame,
                   &c->options.tuntap_options);
 
     c->c1.tuntap_owned = true;

 }
 
 /*
  * Open tun/tap device, ifconfig, call up script, etc.
  */
 
 static bool

 do_open_tun(struct context *c)

 {

     struct gc_arena gc = gc_new();
     bool ret = false;

 #ifndef TARGET_ANDROID

     if (!c->c1.tuntap)

     {

 #endif
 
 #ifdef TARGET_ANDROID

     /* If we emulate persist-tun on android we still have to open a new tun and
      * then close the old */
     int oldtunfd = -1;
     if (c->c1.tuntap)
     {
         oldtunfd = c->c1.tuntap->fd;
     }

 #endif
 

     /* initialize (but do not open) tun/tap object */
     do_init_tun(c);

 #ifdef _WIN32

     /* store (hide) interactive service handle in tuntap_options */
     c->c1.tuntap->options.msg_channel = c->options.msg_channel;
     msg(D_ROUTE, "interactive service msg_channel=%u", (unsigned int) c->options.msg_channel);
 #endif
 
     /* allocate route list structure */
     do_alloc_route_list(c);
 
     /* parse and resolve the route option list */
     ASSERT(c->c2.link_socket);
     if (c->options.routes && c->c1.route_list)
     {
         do_init_route_list(&c->options, c->c1.route_list,
                            &c->c2.link_socket->info, c->c2.es);
     }
     if (c->options.routes_ipv6 && c->c1.route_ipv6_list)
     {
         do_init_route_ipv6_list(&c->options, c->c1.route_ipv6_list,
                                 &c->c2.link_socket->info, c->c2.es);
     }
 
     /* do ifconfig */
     if (!c->options.ifconfig_noexec
         && ifconfig_order() == IFCONFIG_BEFORE_TUN_OPEN)
     {
         /* guess actual tun/tap unit number that will be returned
          * by open_tun */
         const char *guess = guess_tuntap_dev(c->options.dev,
                                              c->options.dev_type,
                                              c->options.dev_node,
                                              &gc);
         do_ifconfig(c->c1.tuntap, guess, TUN_MTU_SIZE(&c->c2.frame), c->c2.es);
     }
 
     /* possibly add routes */
     if (route_order() == ROUTE_BEFORE_TUN)
     {

         /* Ignore route_delay, would cause ROUTE_BEFORE_TUN to be ignored */

         do_route(&c->options, c->c1.route_list, c->c1.route_ipv6_list,
                  c->c1.tuntap, c->plugins, c->c2.es);
     }

 #ifdef TARGET_ANDROID

     /* Store the old fd inside the fd so open_tun can use it */
     c->c1.tuntap->fd = oldtunfd;
 #endif
     /* open the tun device */
     open_tun(c->options.dev, c->options.dev_type, c->options.dev_node,
              c->c1.tuntap);
 
     /* set the hardware address */
     if (c->options.lladdr)
     {
         set_lladdr(c->c1.tuntap->actual_name, c->options.lladdr, c->c2.es);
     }
 
     /* do ifconfig */
     if (!c->options.ifconfig_noexec
         && ifconfig_order() == IFCONFIG_AFTER_TUN_OPEN)
     {
         do_ifconfig(c->c1.tuntap, c->c1.tuntap->actual_name, TUN_MTU_SIZE(&c->c2.frame), c->c2.es);
     }
 
     /* run the up script */
     run_up_down(c->options.up_script,
                 c->plugins,
                 OPENVPN_PLUGIN_UP,
                 c->c1.tuntap->actual_name,

 #ifdef _WIN32

                 c->c1.tuntap->adapter_index,
 #endif
                 dev_type_string(c->options.dev, c->options.dev_type),
                 TUN_MTU_SIZE(&c->c2.frame),
                 EXPANDED_SIZE(&c->c2.frame),
                 print_in_addr_t(c->c1.tuntap->local, IA_EMPTY_IF_UNDEF, &gc),
                 print_in_addr_t(c->c1.tuntap->remote_netmask, IA_EMPTY_IF_UNDEF, &gc),
                 "init",
                 NULL,
                 "up",
                 c->c2.es);

 #if defined(_WIN32)

     if (c->options.block_outside_dns)
     {
         dmsg(D_LOW, "Blocking outside DNS");

         if (!win_wfp_block_dns(c->c1.tuntap->adapter_index, c->options.msg_channel))

         {
             msg(M_FATAL, "Blocking DNS failed!");
         }
     }

 #endif
 

     /* possibly add routes */
     if ((route_order() == ROUTE_AFTER_TUN) && (!c->options.route_delay_defined))
     {
         do_route(&c->options, c->c1.route_list, c->c1.route_ipv6_list,
                  c->c1.tuntap, c->plugins, c->c2.es);
     }

     /*
      * Did tun/tap driver give us an MTU?
      */
     if (c->c1.tuntap->post_open_mtu)
     {
         frame_set_mtu_dynamic(&c->c2.frame,
                               c->c1.tuntap->post_open_mtu,
                               SET_MTU_TUN | SET_MTU_UPPER_BOUND);
     }

     ret = true;
     static_context = c;

 #ifndef TARGET_ANDROID

 }
 else
 {
     msg(M_INFO, "Preserving previous TUN/TAP instance: %s",
         c->c1.tuntap->actual_name);

     /* explicitly set the ifconfig_* env vars */
     do_ifconfig_setenv(c->c1.tuntap, c->c2.es);

     /* run the up script if user specified --up-restart */
     if (c->options.up_restart)
     {
         run_up_down(c->options.up_script,
                     c->plugins,
                     OPENVPN_PLUGIN_UP,
                     c->c1.tuntap->actual_name,

 #ifdef _WIN32

                     c->c1.tuntap->adapter_index,
 #endif
                     dev_type_string(c->options.dev, c->options.dev_type),
                     TUN_MTU_SIZE(&c->c2.frame),
                     EXPANDED_SIZE(&c->c2.frame),
                     print_in_addr_t(c->c1.tuntap->local, IA_EMPTY_IF_UNDEF, &gc),
                     print_in_addr_t(c->c1.tuntap->remote_netmask, IA_EMPTY_IF_UNDEF, &gc),
                     "restart",
                     NULL,
                     "up",
                     c->c2.es);
     }

 #if defined(_WIN32)

     if (c->options.block_outside_dns)
     {
         dmsg(D_LOW, "Blocking outside DNS");
         if (!win_wfp_block_dns(c->c1.tuntap->adapter_index, c->options.msg_channel))

         {

             msg(M_FATAL, "Blocking DNS failed!");

         }

     }

 #endif

 
 }
 #endif /* ifndef TARGET_ANDROID */
     gc_free(&gc);
     return ret;

 }
 
 /*
  * Close TUN/TAP device
  */
 
 static void

 do_close_tun_simple(struct context *c)

 {

     msg(D_CLOSE, "Closing TUN/TAP interface");

     if (c->c1.tuntap)
     {
         close_tun(c->c1.tuntap);
         c->c1.tuntap = NULL;
     }

     c->c1.tuntap_owned = false;

 #if P2MP

     CLEAR(c->c1.pulled_options_digest_save);

 #endif
 }
 
 static void

 do_close_tun(struct context *c, bool force)

 {

     struct gc_arena gc = gc_new();
     if (c->c1.tuntap && c->c1.tuntap_owned)

     {

         const char *tuntap_actual = string_alloc(c->c1.tuntap->actual_name, &gc);

 #ifdef _WIN32

         DWORD adapter_index = c->c1.tuntap->adapter_index;

 #endif

         const in_addr_t local = c->c1.tuntap->local;
         const in_addr_t remote_netmask = c->c1.tuntap->remote_netmask;

         if (force || !(c->sig->signal_received == SIGUSR1 && c->options.persist_tun))
         {
             static_context = NULL;

 #ifdef ENABLE_MANAGEMENT

             /* tell management layer we are about to close the TUN/TAP device */
             if (management)
             {
                 management_pre_tunnel_close(management);
                 management_up_down(management, "DOWN", c->c2.es);
             }
 #endif
 
             /* delete any routes we added */
             if (c->c1.route_list || c->c1.route_ipv6_list)
             {
                 run_up_down(c->options.route_predown_script,
                             c->plugins,
                             OPENVPN_PLUGIN_ROUTE_PREDOWN,
                             tuntap_actual,

 #ifdef _WIN32

                             adapter_index,
 #endif
                             NULL,
                             TUN_MTU_SIZE(&c->c2.frame),
                             EXPANDED_SIZE(&c->c2.frame),
                             print_in_addr_t(local, IA_EMPTY_IF_UNDEF, &gc),
                             print_in_addr_t(remote_netmask, IA_EMPTY_IF_UNDEF, &gc),
                             "init",
                             signal_description(c->sig->signal_received,

                                                c->sig->signal_text),

                             "route-pre-down",
                             c->c2.es);

                 delete_routes(c->c1.route_list, c->c1.route_ipv6_list,
                               c->c1.tuntap, ROUTE_OPTION_FLAGS(&c->options), c->c2.es);

             }

             /* actually close tun/tap device based on --down-pre flag */
             if (!c->options.down_pre)
             {
                 do_close_tun_simple(c);
             }

             /* Run the down script -- note that it will run at reduced
              * privilege if, for example, "--user nobody" was used. */
             run_up_down(c->options.down_script,
                         c->plugins,
                         OPENVPN_PLUGIN_DOWN,
                         tuntap_actual,

 #ifdef _WIN32

                         adapter_index,
 #endif
                         NULL,
                         TUN_MTU_SIZE(&c->c2.frame),
                         EXPANDED_SIZE(&c->c2.frame),
                         print_in_addr_t(local, IA_EMPTY_IF_UNDEF, &gc),
                         print_in_addr_t(remote_netmask, IA_EMPTY_IF_UNDEF, &gc),
                         "init",
                         signal_description(c->sig->signal_received,
                                            c->sig->signal_text),
                         "down",
                         c->c2.es);

 #if defined(_WIN32)

             if (c->options.block_outside_dns)
             {

                 if (!win_wfp_uninit(adapter_index, c->options.msg_channel))

                 {
                     msg(M_FATAL, "Uninitialising WFP failed!");
                 }

             }
 #endif
 

             /* actually close tun/tap device based on --down-pre flag */
             if (c->options.down_pre)
             {
                 do_close_tun_simple(c);
             }
         }
         else
         {
             /* run the down script on this restart if --up-restart was specified */
             if (c->options.up_restart)
             {
                 run_up_down(c->options.down_script,
                             c->plugins,
                             OPENVPN_PLUGIN_DOWN,
                             tuntap_actual,

 #ifdef _WIN32

                             adapter_index,
 #endif
                             NULL,
                             TUN_MTU_SIZE(&c->c2.frame),
                             EXPANDED_SIZE(&c->c2.frame),
                             print_in_addr_t(local, IA_EMPTY_IF_UNDEF, &gc),
                             print_in_addr_t(remote_netmask, IA_EMPTY_IF_UNDEF, &gc),
                             "restart",
                             signal_description(c->sig->signal_received,
                                                c->sig->signal_text),
                             "down",
                             c->c2.es);
             }

 #if defined(_WIN32)

             if (c->options.block_outside_dns)

             {

                 if (!win_wfp_uninit(adapter_index, c->options.msg_channel))

                 {
                     msg(M_FATAL, "Uninitialising WFP failed!");
                 }

             }
 #endif
 

         }

     }

     gc_free(&gc);

 }
 

 void

 tun_abort(void)

 {

     struct context *c = static_context;
     if (c)

     {

         static_context = NULL;
         do_close_tun(c, true);

     }
 }
 

 /*
  * Handle delayed tun/tap interface bringup due to --up-delay or --pull
  */
 

 #if P2MP
 /**
  * Helper for do_up().  Take two option hashes and return true if they are not
  * equal, or either one is all-zeroes.
  */
 static bool

 options_hash_changed_or_zero(const struct sha256_digest *a,
                              const struct sha256_digest *b)

 {

     const struct sha256_digest zero = {{0}};
     return memcmp(a, b, sizeof(struct sha256_digest))
            || !memcmp(a, &zero, sizeof(struct sha256_digest));

 }
 #endif /* P2MP */
 

 bool

 do_up(struct context *c, bool pulled_options, unsigned int option_types_found)

 {

     if (!c->c2.do_up_ran)

     {

         reset_coarse_timers(c);

         if (pulled_options)

         {
             if (!do_deferred_options(c, option_types_found))
             {
                 msg(D_PUSH_ERRORS, "ERROR: Failed to apply push options");
                 return false;
             }
         }

         /* if --up-delay specified, open tun, do ifconfig, and run up script now */
         if (c->options.up_delay || PULL_DEFINED(&c->options))
         {
             c->c2.did_open_tun = do_open_tun(c);
             update_time();

 
 #if P2MP

             /*
              * Was tun interface object persisted from previous restart iteration,
              * and if so did pulled options string change from previous iteration?
              */
             if (!c->c2.did_open_tun
                 && PULL_DEFINED(&c->options)
                 && c->c1.tuntap
                 && options_hash_changed_or_zero(&c->c1.pulled_options_digest_save,
                                                 &c->c2.pulled_options_digest))
             {
                 /* if so, close tun, delete routes, then reinitialize tun and add routes */
                 msg(M_INFO, "NOTE: Pulled options changed on restart, will need to close and reopen TUN/TAP device.");
                 do_close_tun(c, true);

                 management_sleep(1);

                 c->c2.did_open_tun = do_open_tun(c);
                 update_time();
             }
 #endif
         }
 
         if (c->c2.did_open_tun)
         {

 #if P2MP

             c->c1.pulled_options_digest_save = c->c2.pulled_options_digest;
 #endif
 
             /* if --route-delay was specified, start timer */
             if ((route_order() == ROUTE_AFTER_TUN) && c->options.route_delay_defined)
             {
                 event_timeout_init(&c->c2.route_wakeup, c->options.route_delay, now);
                 event_timeout_init(&c->c2.route_wakeup_expire, c->options.route_delay + c->options.route_delay_window, now);
                 if (c->c1.tuntap)
                 {
                     tun_standby_init(c->c1.tuntap);
                 }
             }
             else
             {
                 initialization_sequence_completed(c, 0); /* client/p2p --route-delay undefined */
             }
         }
         else if (c->options.mode == MODE_POINT_TO_POINT)
         {
             initialization_sequence_completed(c, 0); /* client/p2p restart with --persist-tun */
         }
 
         c->c2.do_up_ran = true;
     }
     return true;

 }
 
 /*
  * These are the option categories which will be accepted by pull.
  */
 unsigned int

 pull_permission_mask(const struct context *c)
 {
     unsigned int flags =
         OPT_P_UP
         | OPT_P_ROUTE_EXTRAS
         | OPT_P_SOCKBUF
         | OPT_P_SOCKFLAGS
         | OPT_P_SETENV
         | OPT_P_SHAPER
         | OPT_P_TIMER
         | OPT_P_COMP
         | OPT_P_PERSIST
         | OPT_P_MESSAGES
         | OPT_P_EXPLICIT_NOTIFY
         | OPT_P_ECHO
         | OPT_P_PULL_MODE
         | OPT_P_PEER_ID;
 
     if (!c->options.route_nopull)
     {
         flags |= (OPT_P_ROUTE | OPT_P_IPWIN32);
     }

     if (c->options.ncp_enabled)
     {
         flags |= OPT_P_NCP;
     }

     return flags;

 }
 
 /*
  * Handle non-tun-related pulled options.
  */

 bool

 do_deferred_options(struct context *c, const unsigned int found)

 {

     if (found & OPT_P_MESSAGES)

     {

         init_verb_mute(c, IVM_LEVEL_1|IVM_LEVEL_2);
         msg(D_PUSH, "OPTIONS IMPORT: --verb and/or --mute level changed");

     }

     if (found & OPT_P_TIMER)

     {

         do_init_timers(c, true);
         msg(D_PUSH, "OPTIONS IMPORT: timers and/or timeouts modified");

     }
 
 #ifdef ENABLE_OCC

     if (found & OPT_P_EXPLICIT_NOTIFY)

     {

         if (!proto_is_udp(c->options.ce.proto) && c->options.ce.explicit_exit_notification)
         {
             msg(D_PUSH, "OPTIONS IMPORT: --explicit-exit-notify can only be used with --proto udp");
             c->options.ce.explicit_exit_notification = 0;
         }
         else
         {
             msg(D_PUSH, "OPTIONS IMPORT: explicit notify parm(s) modified");
         }

     }
 #endif
 

 #ifdef USE_COMP

     if (found & OPT_P_COMP)

     {

         msg(D_PUSH, "OPTIONS IMPORT: compression parms modified");
         comp_uninit(c->c2.comp_context);
         c->c2.comp_context = comp_init(&c->options.comp);

     }
 #endif
 

     if (found & OPT_P_SHAPER)

     {

         msg(D_PUSH, "OPTIONS IMPORT: traffic shaper enabled");
         do_init_traffic_shaper(c);

     }
 

     if (found & OPT_P_SOCKBUF)

     {

         msg(D_PUSH, "OPTIONS IMPORT: --sndbuf/--rcvbuf options modified");
         link_socket_update_buffer_sizes(c->c2.link_socket, c->options.rcvbuf, c->options.sndbuf);

     }
 

     if (found & OPT_P_SOCKFLAGS)

     {

         msg(D_PUSH, "OPTIONS IMPORT: --socket-flags option modified");
         link_socket_update_flags(c->c2.link_socket, c->options.sockflags);

     }
 

     if (found & OPT_P_PERSIST)
     {
         msg(D_PUSH, "OPTIONS IMPORT: --persist options modified");
     }
     if (found & OPT_P_UP)
     {
         msg(D_PUSH, "OPTIONS IMPORT: --ifconfig/up options modified");
     }
     if (found & OPT_P_ROUTE)
     {
         msg(D_PUSH, "OPTIONS IMPORT: route options modified");
     }
     if (found & OPT_P_ROUTE_EXTRAS)
     {
         msg(D_PUSH, "OPTIONS IMPORT: route-related options modified");
     }
     if (found & OPT_P_IPWIN32)
     {
         msg(D_PUSH, "OPTIONS IMPORT: --ip-win32 and/or --dhcp-option options modified");
     }
     if (found & OPT_P_SETENV)
     {
         msg(D_PUSH, "OPTIONS IMPORT: environment modified");
     }

     if (found & OPT_P_PEER_ID)
     {
         msg(D_PUSH, "OPTIONS IMPORT: peer-id set");
         c->c2.tls_multi->use_peer_id = true;
         c->c2.tls_multi->peer_id = c->options.peer_id;
         frame_add_to_extra_frame(&c->c2.frame, +3);     /* peer-id overhead */
         if (!c->options.ce.link_mtu_defined)
         {
             frame_add_to_link_mtu(&c->c2.frame, +3);
             msg(D_PUSH, "OPTIONS IMPORT: adjusting link_mtu to %d",
                 EXPANDED_SIZE(&c->c2.frame));
         }
         else
         {
             msg(M_WARN, "OPTIONS IMPORT: WARNING: peer-id set, but link-mtu"
                 " fixed by config - reducing tun-mtu to %d, expect"
                 " MTU problems", TUN_MTU_SIZE(&c->c2.frame) );
         }
     }
 
     /* process (potentially pushed) crypto options */
     if (c->options.pull)
     {
         struct tls_session *session = &c->c2.tls_multi->session[TM_ACTIVE];
         if (found & OPT_P_NCP)
         {
             msg(D_PUSH, "OPTIONS IMPORT: data channel crypto options modified");
         }
         else if (c->options.ncp_enabled)
         {
             tls_poor_mans_ncp(&c->options, c->c2.tls_multi->remote_ciphername);
         }
         /* Do not regenerate keys if server sends an extra push reply */
         if (!session->key[KS_PRIMARY].crypto_options.key_ctx_bi.initialized
             && !tls_session_update_crypto_params(session, &c->options, &c->c2.frame))
         {
             msg(D_TLS_ERRORS, "OPTIONS ERROR: failed to import crypto options");
             return false;
         }
     }

     return true;

 }
 
 /*

  * Possible hold on initialization, holdtime is the
  * time OpenVPN would wait without management

  */
 static bool

 do_hold(int holdtime)

 {
 #ifdef ENABLE_MANAGEMENT

     if (management)

     {

         /* block until management hold is released */
         if (management_hold(management, holdtime))
         {
             return true;
         }

     }
 #endif

     return false;

 }
 
 /*
  * Sleep before restart.
  */
 static void

 socket_restart_pause(struct context *c)

 {

     int sec = 2;
     int backoff = 0;

     switch (c->options.ce.proto)

     {

         case PROTO_TCP_SERVER:
             sec = 1;
             break;
 
         case PROTO_UDP:
         case PROTO_TCP_CLIENT:
             sec = c->options.ce.connect_retry_seconds;
             break;

     }
 
 #ifdef ENABLE_DEBUG

     if (GREMLIN_CONNECTION_FLOOD_LEVEL(c->options.gremlin))
     {
         sec = 0;
     }

 #endif
 
 #if P2MP

     if (auth_retry_get() == AR_NOINTERACT)
     {
         sec = 10;
     }

 #endif

     /* Slow down reconnection after 5 retries per remote -- for tcp only in client mode */
     if (c->options.ce.proto != PROTO_TCP_SERVER)

     {

         backoff = (c->options.unsuccessful_attempts / c->options.connection_list->len) - 4;
         if (backoff > 0)

         {

             /* sec is less than 2^16; we can left shift it by up to 15 bits without overflow */
             sec = max_int(sec, 1) << min_int(backoff, 15);

         }
 

         if (sec > c->options.ce.connect_retry_seconds_max)
         {
             sec = c->options.ce.connect_retry_seconds_max;
         }

     }
 

     if (c->persist.restart_sleep_seconds > 0 && c->persist.restart_sleep_seconds > sec)
     {
         sec = c->persist.restart_sleep_seconds;
     }
     else if (c->persist.restart_sleep_seconds == -1)
     {
         sec = 0;
     }
     c->persist.restart_sleep_seconds = 0;

     /* do managment hold on context restart, i.e. second, third, fourth, etc. initialization */
     if (do_hold(sec))
     {
         sec = 0;
     }

     if (sec)

     {

         msg(D_RESTART, "Restart pause, %d second(s)", sec);

         management_sleep(sec);

     }
 }
 
 /*
  * Do a possible pause on context_2 initialization.
  */
 static void

 do_startup_pause(struct context *c)

 {

     if (!c->first_time)
     {
         socket_restart_pause(c);
     }
     else
     {
         do_hold(0); /* do management hold on first context initialization */
     }

 }
 
 /*
  * Finalize MTU parameters based on command line or config file options.
  */
 static void

 frame_finalize_options(struct context *c, const struct options *o)

 {

     if (!o)
     {
         o = &c->options;
     }

     /*
      * Set adjustment factor for buffer alignment when no
      * cipher is used.
      */
     if (!CIPHER_ENABLED(c))

     {

         frame_align_to_extra_frame(&c->c2.frame);
         frame_or_align_flags(&c->c2.frame,
                              FRAME_HEADROOM_MARKER_FRAGMENT
                              |FRAME_HEADROOM_MARKER_READ_LINK
                              |FRAME_HEADROOM_MARKER_READ_STREAM);

     }

 
     frame_add_to_extra_buffer(&c->c2.frame, PAYLOAD_ALIGN);
     frame_finalize(&c->c2.frame,
                    o->ce.link_mtu_defined,
                    o->ce.link_mtu,
                    o->ce.tun_mtu_defined,
                    o->ce.tun_mtu);

 }
 
 /*
  * Free a key schedule, including OpenSSL components.
  */
 static void

 key_schedule_free(struct key_schedule *ks, bool free_ssl_ctx)

 {

     free_key_ctx_bi(&ks->static_key);
     if (tls_ctx_initialised(&ks->ssl_ctx) && free_ssl_ctx)

     {

         tls_ctx_free(&ks->ssl_ctx);
         free_key_ctx_bi(&ks->tls_wrap_key);

     }

     CLEAR(*ks);

 }
 
 static void

 init_crypto_pre(struct context *c, const unsigned int flags)

 {

     if (c->options.engine)
     {
         crypto_init_lib_engine(c->options.engine);
     }

     if (flags & CF_LOAD_PERSISTED_PACKET_ID)

     {

         /* load a persisted packet-id for cross-session replay-protection */
         if (c->options.packet_id_file)
         {
             packet_id_persist_load(&c->c1.pid_persist, c->options.packet_id_file);
         }

     }
 

 #ifdef ENABLE_PREDICTION_RESISTANCE

     if (c->options.use_prediction_resistance)
     {
         rand_ctx_enable_prediction_resistance();
     }

 #endif
 

 }
 
 /*
  * Static Key Mode (using a pre-shared key)
  */
 static void

 do_init_crypto_static(struct context *c, const unsigned int flags)

 {

     const struct options *options = &c->options;
     ASSERT(options->shared_secret_file);

     init_crypto_pre(c, flags);

     /* Initialize flags */
     if (c->options.mute_replay_warnings)

     {

         c->c2.crypto_options.flags |= CO_MUTE_REPLAY_WARNINGS;

     }
 

     /* Initialize packet ID tracking */
     if (options->replay)

     {

         packet_id_init(&c->c2.crypto_options.packet_id,
                        options->replay_window,
                        options->replay_time,
                        "STATIC", 0);
         c->c2.crypto_options.pid_persist = &c->c1.pid_persist;
         c->c2.crypto_options.flags |= CO_PACKET_ID_LONG_FORM;
         packet_id_persist_load_obj(&c->c1.pid_persist,
                                    &c->c2.crypto_options.packet_id);
     }

     if (!key_ctx_bi_defined(&c->c1.ks.static_key))
     {
         /* Get cipher & hash algorithms */
         init_key_type(&c->c1.ks.key_type, options->ciphername, options->authname,
                       options->keysize, options->test_crypto, true);
 
         /* Read cipher and hmac keys from shared secret file */
         crypto_read_openvpn_key(&c->c1.ks.key_type, &c->c1.ks.static_key,
                                 options->shared_secret_file,
                                 options->shared_secret_file_inline,
                                 options->key_direction, "Static Key Encryption",
                                 "secret");

     }

     else

     {

         msg(M_INFO, "Re-using pre-shared static key");

     }
 

     /* Get key schedule */
     c->c2.crypto_options.key_ctx_bi = c->c1.ks.static_key;

     /* Compute MTU parameters */

     crypto_adjust_frame_parameters(&c->c2.frame, &c->c1.ks.key_type,
                                    options->replay, true);

     /* Sanity check on sequence number, and cipher mode options */
     check_replay_consistency(&c->c1.ks.key_type, options->replay);

 }
 
 /*
  * Initialize the persistent component of OpenVPN's TLS mode,
  * which is preserved across SIGUSR1 resets.
  */
 static void

 do_init_crypto_tls_c1(struct context *c)

 {

     const struct options *options = &c->options;

     if (!tls_ctx_initialised(&c->c1.ks.ssl_ctx))

     {

         /*
          * Initialize the OpenSSL library's global
          * SSL context.
          */
         init_ssl(options, &(c->c1.ks.ssl_ctx));
         if (!tls_ctx_initialised(&c->c1.ks.ssl_ctx))
         {

 #if P2MP

             switch (auth_retry_get())
             {
                 case AR_NONE:
                     msg(M_FATAL, "Error: private key password verification failed");
                     break;
 
                 case AR_INTERACT:
                     ssl_purge_auth(false);
 
                 case AR_NOINTERACT:
                     c->sig->signal_received = SIGUSR1; /* SOFT-SIGUSR1 -- Password failure error */
                     break;
 
                 default:
                     ASSERT(0);
             }
             c->sig->signal_text = "private-key-password-failure";
             return;
 #else  /* if P2MP */
             msg(M_FATAL, "Error: private key password verification failed");
 #endif
         }
 
         /* Get cipher & hash algorithms */
         init_key_type(&c->c1.ks.key_type, options->ciphername, options->authname,
                       options->keysize, true, true);
 
         /* Initialize PRNG with config-specified digest */
         prng_init(options->prng_hash, options->prng_nonce_secret_len);
 
         /* TLS handshake authentication (--tls-auth) */
         if (options->tls_auth_file)
         {
             /* Initialize key_type for tls-auth with auth only */
             CLEAR(c->c1.ks.tls_auth_key_type);
             if (!streq(options->authname, "none"))
             {
                 c->c1.ks.tls_auth_key_type.digest = md_kt_get(options->authname);
                 c->c1.ks.tls_auth_key_type.hmac_length =
                     md_kt_size(c->c1.ks.tls_auth_key_type.digest);
             }
             else
             {
                 msg(M_FATAL, "ERROR: tls-auth enabled, but no valid --auth "
                     "algorithm specified ('%s')", options->authname);
             }
 
             crypto_read_openvpn_key(&c->c1.ks.tls_auth_key_type,
                                     &c->c1.ks.tls_wrap_key, options->tls_auth_file,
                                     options->tls_auth_file_inline, options->key_direction,
                                     "Control Channel Authentication", "tls-auth");
         }
 
         /* TLS handshake encryption+authentication (--tls-crypt) */
         if (options->tls_crypt_file)
         {
             tls_crypt_init_key(&c->c1.ks.tls_wrap_key, options->tls_crypt_file,
                                options->tls_crypt_inline, options->tls_server);
         }
 
         c->c1.ciphername = options->ciphername;
         c->c1.authname = options->authname;
         c->c1.keysize = options->keysize;

 #if 0 /* was: #if ENABLE_INLINE_FILES --  Note that enabling this code will break restarts */

         if (options->priv_key_file_inline)
         {
             string_clear(c->options.priv_key_file_inline);
             c->options.priv_key_file_inline = NULL;
         }

 #endif

     }

     else

     {

         msg(D_INIT_MEDIUM, "Re-using SSL/TLS context");

         /* Restore pre-NCP cipher options */
         c->options.ciphername = c->c1.ciphername;
         c->options.authname = c->c1.authname;
         c->options.keysize = c->c1.keysize;

     }
 }
 
 static void

 do_init_crypto_tls(struct context *c, const unsigned int flags)

 {

     const struct options *options = &c->options;
     struct tls_options to;
     bool packet_id_long_form;

     ASSERT(options->tls_server || options->tls_client);
     ASSERT(!options->test_crypto);

     init_crypto_pre(c, flags);

     /* Make sure we are either a TLS client or server but not both */
     ASSERT(options->tls_server == !options->tls_client);

     /* initialize persistent component */
     do_init_crypto_tls_c1(c);
     if (IS_SIG(c))
     {
         return;
     }

     /* Sanity check on sequence number, and cipher mode options */
     check_replay_consistency(&c->c1.ks.key_type, options->replay);

 
     /* In short form, unique datagram identifier is 32 bits, in long form 64 bits */
     packet_id_long_form = cipher_kt_mode_ofb_cfb(c->c1.ks.key_type.cipher);
 
     /* Compute MTU parameters (postpone if we push/pull options) */
     if (c->options.pull || c->options.mode == MODE_SERVER)
     {
         /* Account for worst-case crypto overhead before allocating buffers */
         frame_add_to_extra_frame(&c->c2.frame, crypto_max_overhead());
     }
     else
     {
         crypto_adjust_frame_parameters(&c->c2.frame, &c->c1.ks.key_type,

                                        options->replay, packet_id_long_form);

     }
     tls_adjust_frame_parameters(&c->c2.frame);
 
     /* Set all command-line TLS-related options */
     CLEAR(to);
 
     if (options->mute_replay_warnings)
     {
         to.crypto_flags |= CO_MUTE_REPLAY_WARNINGS;
     }
 
     to.crypto_flags &= ~(CO_PACKET_ID_LONG_FORM);
     if (packet_id_long_form)
     {
         to.crypto_flags |= CO_PACKET_ID_LONG_FORM;
     }
 
     to.ssl_ctx = c->c1.ks.ssl_ctx;
     to.key_type = c->c1.ks.key_type;
     to.server = options->tls_server;
     to.key_method = options->key_method;
     to.replay = options->replay;
     to.replay_window = options->replay_window;
     to.replay_time = options->replay_time;
     to.tcp_mode = link_socket_proto_connection_oriented(options->ce.proto);
     to.config_ciphername = c->c1.ciphername;
     to.config_authname = c->c1.authname;
     to.ncp_enabled = options->ncp_enabled;
     to.transition_window = options->transition_window;
     to.handshake_window = options->handshake_window;
     to.packet_timeout = options->tls_timeout;
     to.renegotiate_bytes = options->renegotiate_bytes;
     to.renegotiate_packets = options->renegotiate_packets;

     if (options->renegotiate_seconds_min < 0)
     {
         /* Add 10% jitter to reneg-sec by default (server side only) */
         int auto_jitter = options->mode != MODE_SERVER ? 0 :
                 get_random() % max_int(options->renegotiate_seconds / 10, 1);
         to.renegotiate_seconds = options->renegotiate_seconds - auto_jitter;
     }
     else
     {
         /* Add user-specified jitter to reneg-sec */
         to.renegotiate_seconds = options->renegotiate_seconds -
                 (get_random() % max_int(options->renegotiate_seconds
                                         - options->renegotiate_seconds_min, 1));
     }

     to.single_session = options->single_session;
     to.mode = options->mode;
     to.pull = options->pull;
     if (options->push_peer_info)        /* all there is */
     {
         to.push_peer_info_detail = 2;
     }
     else if (options->pull)             /* pull clients send some details */
     {
         to.push_peer_info_detail = 1;
     }
     else                                /* default: no peer-info at all */
     {
         to.push_peer_info_detail = 0;
     }

     /* should we not xmit any packets until we get an initial
      * response from client? */
     if (to.server && options->ce.proto == PROTO_TCP_SERVER)
     {
         to.xmit_hold = true;
     }

 #ifdef ENABLE_OCC

     to.disable_occ = !options->occ;
 #endif
 
     to.verify_command = options->tls_verify;
     to.verify_export_cert = options->tls_export_cert;
     to.verify_x509_type = (options->verify_x509_type & 0xff);
     to.verify_x509_name = options->verify_x509_name;
     to.crl_file = options->crl_file;
     to.crl_file_inline = options->crl_file_inline;
     to.ssl_flags = options->ssl_flags;
     to.ns_cert_type = options->ns_cert_type;
     memmove(to.remote_cert_ku, options->remote_cert_ku, sizeof(to.remote_cert_ku));
     to.remote_cert_eku = options->remote_cert_eku;
     to.verify_hash = options->verify_hash;

     to.verify_hash_algo = options->verify_hash_algo;

 #ifdef ENABLE_X509ALTUSERNAME

     to.x509_username_field = (char *) options->x509_username_field;

 #else

     to.x509_username_field = X509_USERNAME_FIELD_DEFAULT;

 #endif

     to.es = c->c2.es;

 
 #ifdef ENABLE_DEBUG

     to.gremlin = c->options.gremlin;

 #endif
 

     to.plugins = c->plugins;

 #ifdef MANAGEMENT_DEF_AUTH

     to.mda_context = &c->c2.mda_context;

 #endif
 

 #if P2MP_SERVER

     to.auth_user_pass_verify_script = options->auth_user_pass_verify_script;
     to.auth_user_pass_verify_script_via_file = options->auth_user_pass_verify_script_via_file;
     to.tmp_dir = options->tmp_dir;
     if (options->ccd_exclusive)
     {
         to.client_config_dir_exclusive = options->client_config_dir;
     }
     to.auth_user_pass_file = options->auth_user_pass_file;
     to.auth_token_generate = options->auth_token_generate;
     to.auth_token_lifetime = options->auth_token_lifetime;

 #endif
 

     to.x509_track = options->x509_track;

 #if P2MP

 #ifdef ENABLE_CLIENT_CR

     to.sci = &options->sc_info;

 #endif

 #endif

 #ifdef USE_COMP

     to.comp_options = options->comp;

 #endif
 

 #if defined(ENABLE_CRYPTO_OPENSSL) && OPENSSL_VERSION_NUMBER >= 0x10001000

     if (options->keying_material_exporter_label)

     {

         to.ekm_size = options->keying_material_exporter_length;
         if (to.ekm_size < 16 || to.ekm_size > 4095)
         {
             to.ekm_size = 0;
         }

         to.ekm_label = options->keying_material_exporter_label;
         to.ekm_label_size = strlen(to.ekm_label);

     }

     else

     {

         to.ekm_size = 0;

     }
 #endif
 

     /* TLS handshake authentication (--tls-auth) */
     if (options->tls_auth_file)

     {

         to.tls_wrap.mode = TLS_WRAP_AUTH;
         to.tls_wrap.opt.key_ctx_bi = c->c1.ks.tls_wrap_key;
         to.tls_wrap.opt.pid_persist = &c->c1.pid_persist;
         to.tls_wrap.opt.flags |= CO_PACKET_ID_LONG_FORM;

         crypto_adjust_frame_parameters(&to.frame, &c->c1.ks.tls_auth_key_type,
                                        true, true);

     }
 

     /* TLS handshake encryption (--tls-crypt) */
     if (options->tls_crypt_file)

     {

         to.tls_wrap.mode = TLS_WRAP_CRYPT;
         to.tls_wrap.opt.key_ctx_bi = c->c1.ks.tls_wrap_key;
         to.tls_wrap.opt.pid_persist = &c->c1.pid_persist;
         to.tls_wrap.opt.flags |= CO_PACKET_ID_LONG_FORM;
         tls_crypt_adjust_frame_parameters(&to.frame);

     }
 

     /* If we are running over TCP, allow for
      * length prefix */
     socket_adjust_frame_parameters(&to.frame, options->ce.proto);

     /*
      * Initialize OpenVPN's master TLS-mode object.
      */
     if (flags & CF_INIT_TLS_MULTI)
     {
         c->c2.tls_multi = tls_multi_init(&to);
     }

     if (flags & CF_INIT_TLS_AUTH_STANDALONE)
     {
         c->c2.tls_auth_standalone = tls_auth_standalone_init(&to, &c->c2.gc);
     }

 }
 
 static void

 do_init_finalize_tls_frame(struct context *c)

 {

     if (c->c2.tls_multi)

     {

         tls_multi_init_finalize(c->c2.tls_multi, &c->c2.frame);
         ASSERT(EXPANDED_SIZE(&c->c2.tls_multi->opt.frame) <=
                EXPANDED_SIZE(&c->c2.frame));
         frame_print(&c->c2.tls_multi->opt.frame, D_MTU_INFO,
                     "Control Channel MTU parms");

     }

     if (c->c2.tls_auth_standalone)

     {

         tls_auth_standalone_finalize(c->c2.tls_auth_standalone, &c->c2.frame);
         frame_print(&c->c2.tls_auth_standalone->frame, D_MTU_INFO,
                     "TLS-Auth MTU parms");

     }
 }
 
 /*
  * No encryption or authentication.
  */
 static void

 do_init_crypto_none(const struct context *c)

 {

     ASSERT(!c->options.test_crypto);
     msg(M_WARN,

         "******* WARNING *******: All encryption and authentication features "
         "disabled -- All data will be tunnelled as clear text and will not be "
         "protected against man-in-the-middle changes. "
         "PLEASE DO RECONSIDER THIS CONFIGURATION!");

 }
 
 static void

 do_init_crypto(struct context *c, const unsigned int flags)

 {

     if (c->options.shared_secret_file)
     {
         do_init_crypto_static(c, flags);
     }
     else if (c->options.tls_server || c->options.tls_client)
     {
         do_init_crypto_tls(c, flags);
     }
     else                        /* no encryption or authentication. */
     {
         do_init_crypto_none(c);
     }

 }
 
 static void

 do_init_frame(struct context *c)

 {

 #ifdef USE_COMP

     /*
      * modify frame parameters if compression is enabled
      */
     if (comp_enabled(&c->options.comp))

     {

         comp_add_to_extra_frame(&c->c2.frame);

 #if !defined(ENABLE_LZ4)

         /*
          * Compression usage affects buffer alignment when non-swapped algs
          * such as LZO is used.
          * Newer algs like LZ4 and comp-stub with COMP_F_SWAP don't need
          * any special alignment because of the control-byte swap approach.
          * LZO alignment (on the other hand) is problematic because
          * the presence of the control byte means that either the output of
          * decryption must be written to an unaligned buffer, or the input
          * to compression (or packet dispatch if packet is uncompressed)
          * must be read from an unaligned buffer.
          * This code tries to align the input to compression (or packet
          * dispatch if packet is uncompressed) at the cost of requiring
          * decryption output to be written to an unaligned buffer, so
          * it's more of a tradeoff than an optimal solution and we don't
          * include it when we are doing a modern build with LZ4.
          * Strictly speaking, on the server it would be better to execute
          * this code for every connection after we decide the compression
          * method, but currently the frame code doesn't appear to be
          * flexible enough for this, since the frame is already established
          * before it is known which compression options will be pushed.
          */
         if (comp_unswapped_prefix(&c->options.comp) && CIPHER_ENABLED(c))
         {
             frame_add_to_align_adjust(&c->c2.frame, COMP_PREFIX_LEN);
             frame_or_align_flags(&c->c2.frame,
                                  FRAME_HEADROOM_MARKER_FRAGMENT
                                  |FRAME_HEADROOM_MARKER_DECRYPT);
         }

 #endif

 
 #ifdef ENABLE_FRAGMENT

         comp_add_to_extra_frame(&c->c2.frame_fragment_omit); /* omit compression frame delta from final frame_fragment */

 #endif
     }

 #endif /* USE_COMP */

     /*
      * Adjust frame size for UDP Socks support.
      */
     if (c->options.ce.socks_proxy_server)
     {
         socks_adjust_frame_parameters(&c->c2.frame, c->options.ce.proto);
     }
 
     /*
      * Adjust frame size based on the --tun-mtu-extra parameter.
      */
     if (c->options.ce.tun_mtu_extra_defined)
     {
         tun_adjust_frame_parameters(&c->c2.frame, c->options.ce.tun_mtu_extra);
     }
 
     /*
      * Adjust frame size based on link socket parameters.
      * (Since TCP is a stream protocol, we need to insert
      * a packet length uint16_t in the buffer.)
      */
     socket_adjust_frame_parameters(&c->c2.frame, c->options.ce.proto);
 
     /*
      * Fill in the blanks in the frame parameters structure,
      * make sure values are rational, etc.
      */
     frame_finalize_options(c, NULL);

 #ifdef USE_COMP

     /*
      * Modify frame parameters if compression is compiled in.
      * Should be called after frame_finalize_options.
      */
     comp_add_to_extra_buffer(&c->c2.frame);

 #ifdef ENABLE_FRAGMENT

     comp_add_to_extra_buffer(&c->c2.frame_fragment_omit); /* omit compression frame delta from final frame_fragment */

 #endif
 #endif /* USE_COMP */
 

     /* packets with peer-id (P_DATA_V2) need 3 extra bytes in frame (on client)
      * and need link_mtu+3 bytes on socket reception (on server).
      *
      * accomodate receive path in f->extra_link, which has the side effect of
      * also increasing send buffers (BUF_SIZE() macro), which need to be
      * allocated big enough before receiving peer-id option from server.
      *
      * f->extra_frame is adjusted when peer-id option is push-received
      */
     frame_add_to_extra_link(&c->c2.frame, 3);

 #ifdef ENABLE_FRAGMENT

     /*
      * Set frame parameter for fragment code.  This is necessary because
      * the fragmentation code deals with payloads which have already been
      * passed through the compression code.
      */
     c->c2.frame_fragment = c->c2.frame;
     frame_subtract_extra(&c->c2.frame_fragment, &c->c2.frame_fragment_omit);

 #endif
 
 #if defined(ENABLE_FRAGMENT) && defined(ENABLE_OCC)

     /*
      * MTU advisories
      */
     if (c->options.ce.fragment && c->options.mtu_test)
     {
         msg(M_WARN,
             "WARNING: using --fragment and --mtu-test together may produce an inaccurate MTU test result");
     }

 #endif
 
 #ifdef ENABLE_FRAGMENT

     if ((c->options.ce.mssfix || c->options.ce.fragment)
         && TUN_MTU_SIZE(&c->c2.frame_fragment) != ETHERNET_MTU)
     {
         msg(M_WARN,
             "WARNING: normally if you use --mssfix and/or --fragment, you should also set --tun-mtu %d (currently it is %d)",
             ETHERNET_MTU, TUN_MTU_SIZE(&c->c2.frame_fragment));
     }

 #endif
 }
 
 static void

 do_option_warnings(struct context *c)

 {

     const struct options *o = &c->options;

     if (o->ping_send_timeout && !o->ping_rec_timeout)
     {
         msg(M_WARN, "WARNING: --ping should normally be used with --ping-restart or --ping-exit");
     }

     if (o->username || o->groupname || o->chroot_dir

 #ifdef ENABLE_SELINUX

         || o->selinux_context

 #endif

         )
     {
         if (!o->persist_tun)
         {
             msg(M_WARN, "WARNING: you are using user/group/chroot/setcon without persist-tun -- this may cause restarts to fail");
         }
         if (!o->persist_key

 #ifdef ENABLE_PKCS11

             && !o->pkcs11_id

 #endif

             )
         {
             msg(M_WARN, "WARNING: you are using user/group/chroot/setcon without persist-key -- this may cause restarts to fail");
         }
     }

     if (o->chroot_dir && !(o->username && o->groupname))
     {
         msg(M_WARN, "WARNING: you are using chroot without specifying user and group -- this may cause the chroot jail to be insecure");
     }

 #if P2MP

     if (o->pull && o->ifconfig_local && c->first_time)
     {
         msg(M_WARN, "WARNING: using --pull/--client and --ifconfig together is probably not what you want");
     }

 
 #if P2MP_SERVER

     if (o->server_bridge_defined | o->server_bridge_proxy_dhcp)
     {
         msg(M_WARN, "NOTE: when bridging your LAN adapter with the TAP adapter, note that the new bridge adapter will often take on its own IP address that is different from what the LAN adapter was previously set to");
     }

     if (o->mode == MODE_SERVER)

     {

         if (o->duplicate_cn && o->client_config_dir)
         {
             msg(M_WARN, "WARNING: using --duplicate-cn and --client-config-dir together is probably not what you want");
         }
         if (o->duplicate_cn && o->ifconfig_pool_persist_filename)
         {
             msg(M_WARN, "WARNING: --ifconfig-pool-persist will not work with --duplicate-cn");
         }
         if (!o->keepalive_ping || !o->keepalive_timeout)
         {
             msg(M_WARN, "WARNING: --keepalive option is missing from server config");
         }

     }

 #endif /* if P2MP_SERVER */
 #endif /* if P2MP */

     if (!o->replay)
     {
         msg(M_WARN, "WARNING: You have disabled Replay Protection (--no-replay) which may make " PACKAGE_NAME " less secure");
     }
 
     if (o->tls_server)
     {
         warn_on_use_of_common_subnets();
     }
     if (o->tls_client
         && !o->tls_verify
         && o->verify_x509_type == VERIFY_X509_NONE
         && !(o->ns_cert_type & NS_CERT_CHECK_SERVER)
         && !o->remote_cert_eku)
     {
         msg(M_WARN, "WARNING: No server certificate verification method has been enabled.  See http://openvpn.net/howto.html#mitm for more info.");
     }

     if (o->ns_cert_type)
     {
         msg(M_WARN, "WARNING: --ns-cert-type is DEPRECATED.  Use --remote-cert-tls instead.");
     }

 
     /* If a script is used, print appropiate warnings */
     if (o->user_script_used)
     {

         if (script_security() >= SSEC_SCRIPTS)

         {
             msg(M_WARN, "NOTE: the current --script-security setting may allow this configuration to call user-defined scripts");
         }

         else if (script_security() >= SSEC_PW_ENV)

         {
             msg(M_WARN, "WARNING: the current --script-security setting may allow passwords to be passed to scripts via environmental variables");
         }
         else
         {
             msg(M_WARN, "NOTE: starting with " PACKAGE_NAME " 2.1, '--script-security 2' or higher is required to call user-defined scripts or executables");
         }
     }

 }
 
 static void

 do_init_frame_tls(struct context *c)

 {

     do_init_finalize_tls_frame(c);

 }
 
 struct context_buffers *

 init_context_buffers(const struct frame *frame)

 {

     struct context_buffers *b;

     ALLOC_OBJ_CLEAR(b, struct context_buffers);

     b->read_link_buf = alloc_buf(BUF_SIZE(frame));
     b->read_tun_buf = alloc_buf(BUF_SIZE(frame));

     b->aux_buf = alloc_buf(BUF_SIZE(frame));

     b->encrypt_buf = alloc_buf(BUF_SIZE(frame));
     b->decrypt_buf = alloc_buf(BUF_SIZE(frame));

 #ifdef USE_COMP

     b->compress_buf = alloc_buf(BUF_SIZE(frame));
     b->decompress_buf = alloc_buf(BUF_SIZE(frame));

 #endif
 

     return b;

 }
 
 void

 free_context_buffers(struct context_buffers *b)

 {

     if (b)

     {

         free_buf(&b->read_link_buf);
         free_buf(&b->read_tun_buf);
         free_buf(&b->aux_buf);

 #ifdef USE_COMP

         free_buf(&b->compress_buf);
         free_buf(&b->decompress_buf);

 #endif
 

         free_buf(&b->encrypt_buf);
         free_buf(&b->decrypt_buf);

         free(b);

     }
 }
 
 /*
  * Now that we know all frame parameters, initialize
  * our buffers.
  */
 static void

 do_init_buffers(struct context *c)

 {

     c->c2.buffers = init_context_buffers(&c->c2.frame);
     c->c2.buffers_owned = true;

 }
 
 #ifdef ENABLE_FRAGMENT
 /*
  * Fragmenting code has buffers to initialize
  * once frame parameters are known.
  */
 static void

 do_init_fragment(struct context *c)

 {

     ASSERT(c->options.ce.fragment);
     frame_set_mtu_dynamic(&c->c2.frame_fragment,
                           c->options.ce.fragment, SET_MTU_UPPER_BOUND);
     fragment_frame_init(c->c2.fragment, &c->c2.frame_fragment);

 }
 #endif
 
 /*
  * Allocate our socket object.
  */
 static void

 do_link_socket_new(struct context *c)

 {

     ASSERT(!c->c2.link_socket);
     c->c2.link_socket = link_socket_new();
     c->c2.link_socket_owned = true;

 }
 
 /*
  * bind the TCP/UDP socket
  */
 static void

 do_init_socket_1(struct context *c, const int mode)

 {

     unsigned int sockflags = c->options.sockflags;

 
 #if PORT_SHARE

     if (c->options.port_share_host && c->options.port_share_port)
     {
         sockflags |= SF_PORT_SHARE;
     }
 #endif
 
     link_socket_init_phase1(c->c2.link_socket,
                             c->options.ce.local,
                             c->options.ce.local_port,
                             c->options.ce.remote,
                             c->options.ce.remote_port,
                             c->c1.dns_cache,
                             c->options.ce.proto,
                             c->options.ce.af,
                             c->options.ce.bind_ipv6_only,
                             mode,
                             c->c2.accept_from,
                             c->c1.http_proxy,
                             c->c1.socks_proxy,

 #ifdef ENABLE_DEBUG

                             c->options.gremlin,
 #endif
                             c->options.ce.bind_local,
                             c->options.ce.remote_float,
                             c->options.inetd,
                             &c->c1.link_socket_addr,
                             c->options.ipchange,
                             c->plugins,
                             c->options.resolve_retry_seconds,
                             c->options.ce.mtu_discover_type,
                             c->options.rcvbuf,
                             c->options.sndbuf,
                             c->options.mark,
                             &c->c2.server_poll_interval,
                             sockflags);

 }
 
 /*
  * finalize the TCP/UDP socket
  */
 static void

 do_init_socket_2(struct context *c)

 {

     link_socket_init_phase2(c->c2.link_socket, &c->c2.frame,
                             c->sig);

 }
 
 /*
  * Print MTU INFO
  */
 static void

 do_print_data_channel_mtu_parms(struct context *c)

 {

     frame_print(&c->c2.frame, D_MTU_INFO, "Data Channel MTU parms");

 #ifdef ENABLE_FRAGMENT

     if (c->c2.fragment)
     {
         frame_print(&c->c2.frame_fragment, D_MTU_INFO,
                     "Fragmentation MTU parms");
     }

 #endif
 }
 
 #ifdef ENABLE_OCC
 /*
  * Get local and remote options compatibility strings.
  */
 static void

 do_compute_occ_strings(struct context *c)

 {

     struct gc_arena gc = gc_new();

     c->c2.options_string_local =
         options_string(&c->options, &c->c2.frame, c->c1.tuntap, false, &gc);
     c->c2.options_string_remote =
         options_string(&c->options, &c->c2.frame, c->c1.tuntap, true, &gc);

     msg(D_SHOW_OCC, "Local Options String (VER=%s): '%s'",
         options_string_version(c->c2.options_string_local, &gc),
         c->c2.options_string_local);
     msg(D_SHOW_OCC, "Expected Remote Options String (VER=%s): '%s'",
         options_string_version(c->c2.options_string_remote, &gc),
         c->c2.options_string_remote);

     if (c->c2.tls_multi)
     {
         tls_multi_init_set_options(c->c2.tls_multi,
                                    c->c2.options_string_local,
                                    c->c2.options_string_remote);
     }

     gc_free(&gc);

 }

 #endif /* ifdef ENABLE_OCC */

 
 /*
  * These things can only be executed once per program instantiation.
  * Set up for possible UID/GID downgrade, but don't do it yet.
  * Daemonize if requested.
  */
 static void

 do_init_first_time(struct context *c)

 {

     if (c->first_time && !c->c0)

     {

         struct context_0 *c0;

         ALLOC_OBJ_CLEAR_GC(c->c0, struct context_0, &c->gc);
         c0 = c->c0;

         /* get user and/or group that we want to setuid/setgid to */
         c0->uid_gid_specified =
             platform_group_get(c->options.groupname, &c0->platform_state_group)
             |platform_user_get(c->options.username, &c0->platform_state_user);

         /* perform postponed chdir if --daemon */
         if (c->did_we_daemonize && c->options.cd_dir == NULL)
         {
             platform_chdir("/");
         }
 
         /* should we change scheduling priority? */
         platform_nice(c->options.nice);

     }
 }
 
 /*
  * If xinetd/inetd mode, don't allow restart.
  */
 static void

 do_close_check_if_restart_permitted(struct context *c)

 {

     if (c->options.inetd
         && (c->sig->signal_received == SIGHUP
             || c->sig->signal_received == SIGUSR1))

     {

         c->sig->signal_received = SIGTERM;
         msg(M_INFO,
             PACKAGE_NAME
             " started by inetd/xinetd cannot restart... Exiting.");

     }
 }
 
 /*
  * free buffers
  */
 static void

 do_close_free_buf(struct context *c)

 {

     if (c->c2.buffers_owned)

     {

         free_context_buffers(c->c2.buffers);
         c->c2.buffers = NULL;
         c->c2.buffers_owned = false;

     }
 }
 
 /*
  * close TLS
  */
 static void

 do_close_tls(struct context *c)

 {

     if (c->c2.tls_multi)

     {

         tls_multi_free(c->c2.tls_multi, true);
         c->c2.tls_multi = NULL;

     }
 
 #ifdef ENABLE_OCC

     /* free options compatibility strings */
     if (c->c2.options_string_local)
     {
         free(c->c2.options_string_local);
     }
     if (c->c2.options_string_remote)
     {
         free(c->c2.options_string_remote);
     }
     c->c2.options_string_local = c->c2.options_string_remote = NULL;

 #endif

 
     if (c->c2.pulled_options_state)
     {
         md_ctx_cleanup(c->c2.pulled_options_state);
         md_ctx_free(c->c2.pulled_options_state);
     }

 }
 
 /*
  * Free key schedules
  */
 static void

 do_close_free_key_schedule(struct context *c, bool free_ssl_ctx)

 {

     if (!(c->sig->signal_received == SIGUSR1 && c->options.persist_key))
     {
         key_schedule_free(&c->c1.ks, free_ssl_ctx);
     }

 }
 
 /*
  * Close TCP/UDP connection
  */
 static void

 do_close_link_socket(struct context *c)

 {

     if (c->c2.link_socket && c->c2.link_socket_owned)

     {

         link_socket_close(c->c2.link_socket);
         c->c2.link_socket = NULL;

     }
 

 
     /* Preserve the resolved list of remote if the user request to or if we want
      * reconnect to the same host again or there are still addresses that need
      * to be tried */
     if (!(c->sig->signal_received == SIGUSR1
           && ( (c->options.persist_remote_ip)
                ||
                ( c->sig->source != SIG_SOURCE_HARD
                  && ((c->c1.link_socket_addr.current_remote && c->c1.link_socket_addr.current_remote->ai_next)
                      || c->options.no_advance))
                )))

     {

         clear_remote_addrlist(&c->c1.link_socket_addr, !c->options.resolve_in_advance);

     }
 
     /* Clear the remote actual address when persist_remote_ip is not in use */
     if (!(c->sig->signal_received == SIGUSR1 && c->options.persist_remote_ip))

     {
         CLEAR(c->c1.link_socket_addr.actual);
     }

     if (!(c->sig->signal_received == SIGUSR1 && c->options.persist_local_ip))
     {
         if (c->c1.link_socket_addr.bind_local && !c->options.resolve_in_advance)
         {
             freeaddrinfo(c->c1.link_socket_addr.bind_local);
         }

         c->c1.link_socket_addr.bind_local = NULL;
     }

 }
 
 /*
  * Close packet-id persistance file
  */
 static void

 do_close_packet_id(struct context *c)

 {

     packet_id_free(&c->c2.crypto_options.packet_id);
     packet_id_persist_save(&c->c1.pid_persist);
     if (!(c->sig->signal_received == SIGUSR1))
     {
         packet_id_persist_close(&c->c1.pid_persist);
     }

 }
 
 #ifdef ENABLE_FRAGMENT
 /*
  * Close fragmentation handler.
  */
 static void

 do_close_fragment(struct context *c)

 {

     if (c->c2.fragment)

     {

         fragment_free(c->c2.fragment);
         c->c2.fragment = NULL;

     }
 }
 #endif
 
 /*
  * Open and close our event objects.
  */
 
 static void

 do_event_set_init(struct context *c,
                   bool need_us_timeout)

 {

     unsigned int flags = 0;

     c->c2.event_set_max = BASE_N_EVENTS;

     flags |= EVENT_METHOD_FAST;

     if (need_us_timeout)
     {
         flags |= EVENT_METHOD_US_TIMEOUT;
     }

     c->c2.event_set = event_set_init(&c->c2.event_set_max, flags);
     c->c2.event_set_owned = true;

 }
 
 static void

 do_close_event_set(struct context *c)

 {

     if (c->c2.event_set && c->c2.event_set_owned)

     {

         event_free(c->c2.event_set);
         c->c2.event_set = NULL;
         c->c2.event_set_owned = false;

     }
 }
 
 /*
  * Open and close --status file
  */
 
 static void

 do_open_status_output(struct context *c)

 {

     if (!c->c1.status_output)

     {

         c->c1.status_output = status_open(c->options.status_file,
                                           c->options.status_file_update_freq,
                                           -1,
                                           NULL,
                                           STATUS_OUTPUT_WRITE);
         c->c1.status_output_owned = true;

     }
 }
 
 static void

 do_close_status_output(struct context *c)

 {

     if (!(c->sig->signal_received == SIGUSR1))

     {

         if (c->c1.status_output_owned && c->c1.status_output)
         {
             status_close(c->c1.status_output);
             c->c1.status_output = NULL;
             c->c1.status_output_owned = false;
         }

     }
 }
 
 /*
  * Handle ifconfig-pool persistance object.
  */
 static void

 do_open_ifconfig_pool_persist(struct context *c)

 {
 #if P2MP_SERVER

     if (!c->c1.ifconfig_pool_persist && c->options.ifconfig_pool_persist_filename)

     {

         c->c1.ifconfig_pool_persist = ifconfig_pool_persist_init(c->options.ifconfig_pool_persist_filename,
                                                                  c->options.ifconfig_pool_persist_refresh_freq);
         c->c1.ifconfig_pool_persist_owned = true;

     }
 #endif
 }
 
 static void

 do_close_ifconfig_pool_persist(struct context *c)

 {
 #if P2MP_SERVER

     if (!(c->sig->signal_received == SIGUSR1))

     {

         if (c->c1.ifconfig_pool_persist && c->c1.ifconfig_pool_persist_owned)
         {
             ifconfig_pool_persist_close(c->c1.ifconfig_pool_persist);
             c->c1.ifconfig_pool_persist = NULL;
             c->c1.ifconfig_pool_persist_owned = false;
         }

     }
 #endif
 }
 
 /*
  * Inherit environmental variables
  */
 
 static void

 do_inherit_env(struct context *c, const struct env_set *src)

 {

     c->c2.es = env_set_create(NULL);
     c->c2.es_owned = true;
     env_set_inherit(c->c2.es, src);

 }
 

 static void

 do_env_set_destroy(struct context *c)

 {

     if (c->c2.es && c->c2.es_owned)

     {

         env_set_destroy(c->c2.es);
         c->c2.es = NULL;
         c->c2.es_owned = false;

     }
 }
 

 /*
  * Fast I/O setup.  Fast I/O is an optimization which only works
  * if all of the following are true:
  *
  * (1) The platform is not Windows
  * (2) --proto udp is enabled
  * (3) --shaper is disabled
  */
 static void

 do_setup_fast_io(struct context *c)

 {

     if (c->options.fast_io)

     {

 #ifdef _WIN32

         msg(M_INFO, "NOTE: --fast-io is disabled since we are running on Windows");

 #else

         if (!proto_is_udp(c->options.ce.proto))
         {
             msg(M_INFO, "NOTE: --fast-io is disabled since we are not using UDP");
         }
         else
         {

 #ifdef ENABLE_FEATURE_SHAPER

             if (c->options.shaper)
             {
                 msg(M_INFO, "NOTE: --fast-io is disabled since we are using --shaper");
             }
             else

 #endif

             {
                 c->c2.fast_io = true;
             }
         }

 #endif
     }
 }
 
 static void

 do_signal_on_tls_errors(struct context *c)

 {

     if (c->options.tls_exit)
     {
         c->c2.tls_exit_signal = SIGTERM;
     }
     else
     {
         c->c2.tls_exit_signal = SIGUSR1;
     }

 }
 

 #ifdef ENABLE_PLUGIN

 void

 init_plugins(struct context *c)

 {

     if (c->options.plugin_list && !c->plugins)

     {

         c->plugins = plugin_list_init(c->options.plugin_list);
         c->plugins_owned = true;

     }
 }
 
 void

 open_plugins(struct context *c, const bool import_options, int init_point)
 {
     if (c->plugins && c->plugins_owned)
     {
         if (import_options)
         {
             struct plugin_return pr, config;
             plugin_return_init(&pr);
             plugin_list_open(c->plugins, c->options.plugin_list, &pr, c->c2.es, init_point);
             plugin_return_get_column(&pr, &config, "config");
             if (plugin_return_defined(&config))
             {
                 int i;
                 for (i = 0; i < config.n; ++i)
                 {
                     unsigned int option_types_found = 0;
                     if (config.list[i] && config.list[i]->value)
                     {
                         options_string_import(&c->options,
                                               config.list[i]->value,
                                               D_IMPORT_ERRORS|M_OPTERR,
                                               OPT_P_DEFAULT & ~OPT_P_PLUGIN,
                                               &option_types_found,
                                               c->es);
                     }
                 }
             }
             plugin_return_free(&pr);
         }
         else
         {
             plugin_list_open(c->plugins, c->options.plugin_list, NULL, c->c2.es, init_point);
         }

     }
 }
 
 static void

 do_close_plugins(struct context *c)

 {

     if (c->plugins && c->plugins_owned && !(c->sig->signal_received == SIGUSR1))

     {

         plugin_list_close(c->plugins);
         c->plugins = NULL;
         c->plugins_owned = false;

     }
 }
 

 static void

 do_inherit_plugins(struct context *c, const struct context *src)

 {

     if (!c->plugins && src->plugins)

     {

         c->plugins = plugin_list_inherit(src->plugins);
         c->plugins_owned = true;

     }
 }
 

 #endif /* ifdef ENABLE_PLUGIN */

 #ifdef ENABLE_MANAGEMENT
 
 static void

 management_callback_status_p2p(void *arg, const int version, struct status_output *so)

 {

     struct context *c = (struct context *) arg;
     print_status(c, so);

 }
 
 void

 management_show_net_callback(void *arg, const int msglevel)

 {

 #ifdef _WIN32

     show_routes(msglevel);
     show_adapters(msglevel);
     msg(msglevel, "END");

 #else

     msg(msglevel, "ERROR: Sorry, this command is currently only implemented on Windows");

 #endif
 }
 

 #ifdef TARGET_ANDROID
 int

 management_callback_network_change(void *arg, bool samenetwork)

 {
     /* Check if the client should translate the network change to a SIGUSR1 to

      * reestablish the connection or just reprotect the socket
      *
      * At the moment just assume that, for all settings that use pull (not
      * --static) and are not using peer-id reestablishing the connection is
      * required (unless the network is the same)
      *
      * The function returns -1 on invalid fd and -2 if the socket cannot be
      * reused. On the -2 return value the man_network_change function triggers
      * a SIGUSR1 to force a reconnect.
      */
 
     int socketfd = -1;
     struct context *c = (struct context *) arg;
     if (!c->c2.link_socket)
     {
         return -1;
     }
     if (c->c2.link_socket->sd == SOCKET_UNDEFINED)
     {
         return -1;
     }

     socketfd = c->c2.link_socket->sd;
     if (!c->options.pull || c->c2.tls_multi->use_peer_id || samenetwork)
     {
         return socketfd;
     }
     else
     {
         return -2;
     }

 }

 #endif /* ifdef TARGET_ANDROID */

 #endif /* ifdef ENABLE_MANAGEMENT */

 
 void

 init_management_callback_p2p(struct context *c)

 {
 #ifdef ENABLE_MANAGEMENT

     if (management)
     {
         struct management_callback cb;
         CLEAR(cb);
         cb.arg = c;
         cb.status = management_callback_status_p2p;
         cb.show_net = management_show_net_callback;
         cb.proxy_cmd = management_callback_proxy_cmd;
         cb.remote_cmd = management_callback_remote_cmd;

 #ifdef TARGET_ANDROID

         cb.network_change = management_callback_network_change;

 #endif

         management_set_callback(management, &cb);

     }
 #endif
 }
 
 #ifdef ENABLE_MANAGEMENT
 
 void

 init_management(struct context *c)

 {

     if (!management)
     {
         management = management_init();
     }

 }
 
 bool

 open_management(struct context *c)
 {
     /* initialize management layer */
     if (management)
     {
         if (c->options.management_addr)
         {
             unsigned int flags = c->options.management_flags;
             if (c->options.mode == MODE_SERVER)
             {
                 flags |= MF_SERVER;
             }
             if (management_open(management,
                                 c->options.management_addr,
                                 c->options.management_port,
                                 c->options.management_user_pass,
                                 c->options.management_client_user,
                                 c->options.management_client_group,
                                 c->options.management_log_history_cache,
                                 c->options.management_echo_buffer_size,
                                 c->options.management_state_buffer_size,
                                 c->options.management_write_peer_info_file,
                                 c->options.remap_sigusr1,
                                 flags))
             {
                 management_set_state(management,
                                      OPENVPN_STATE_CONNECTING,
                                      NULL,
                                      NULL,
                                      NULL,
                                      NULL,
                                      NULL);
             }
 
             /* initial management hold, called early, before first context initialization */
             do_hold(0);
             if (IS_SIG(c))
             {
                 msg(M_WARN, "Signal received from management interface, exiting");
                 return false;
             }
         }
         else
         {
             close_management();
         }
     }
     return true;

 }
 
 void

 close_management(void)

 {

     if (management)

     {

         management_close(management);
         management = NULL;

     }
 }
 

 #endif /* ifdef ENABLE_MANAGEMENT */

 
 
 void

 uninit_management_callback(void)

 {
 #ifdef ENABLE_MANAGEMENT

     if (management)

     {

         management_clear_callback(management);

     }
 #endif
 }
 
 /*
  * Initialize a tunnel instance, handle pre and post-init
  * signal settings.
  */
 void

 init_instance_handle_signals(struct context *c, const struct env_set *env, const unsigned int flags)

 {

     pre_init_signal_catch();
     init_instance(c, env, flags);
     post_init_signal_catch();
 
     /*
      * This is done so that signals thrown during
      * initialization can bring us back to
      * a management hold.
      */
     if (IS_SIG(c))

     {

         remap_signal(c);
         uninit_management_callback();

     }

 }
 
 /*
  * Initialize a tunnel instance.
  */
 void

 init_instance(struct context *c, const struct env_set *env, const unsigned int flags)

 {

     const struct options *options = &c->options;
     const bool child = (c->mode == CM_CHILD_TCP || c->mode == CM_CHILD_UDP);
     int link_socket_mode = LS_MODE_DEFAULT;

     /* init garbage collection level */
     gc_init(&c->c2.gc);

     /* inherit environmental variables */
     if (env)
     {
         do_inherit_env(c, env);
     }

     /* signals caught here will abort */
     c->sig->signal_received = 0;
     c->sig->signal_text = NULL;
     c->sig->source = SIG_SOURCE_SOFT;

     if (c->mode == CM_P2P)
     {
         init_management_callback_p2p(c);
     }

     /* possible sleep or management hold if restart */
     if (c->mode == CM_P2P || c->mode == CM_TOP)

     {

         do_startup_pause(c);
         if (IS_SIG(c))
         {
             goto sig;
         }

     }
 

     if (c->options.resolve_in_advance)

     {

         do_preresolve(c);
         if (IS_SIG(c))
         {
             goto sig;
         }

     }
 

     /* map in current connection entry */
     next_connection_entry(c);

     /* link_socket_mode allows CM_CHILD_TCP
      * instances to inherit acceptable fds
      * from a top-level parent */
     if (c->options.ce.proto == PROTO_TCP_SERVER)

     {

         if (c->mode == CM_TOP)
         {
             link_socket_mode = LS_MODE_TCP_LISTEN;
         }
         else if (c->mode == CM_CHILD_TCP)
         {
             link_socket_mode = LS_MODE_TCP_ACCEPT_FROM;
         }

     }
 

     /* should we disable paging? */
     if (c->first_time && options->mlock)
     {
         platform_mlockall(true);
     }

 #if P2MP

     /* get passwords if undefined */
     if (auth_retry_get() == AR_INTERACT)
     {
         init_query_passwords(c);
     }

 #endif
 

     /* initialize context level 2 --verb/--mute parms */
     init_verb_mute(c, IVM_LEVEL_2);
 
     /* set error message delay for non-server modes */
     if (c->mode == CM_P2P)
     {
         set_check_status_error_delay(P2P_ERROR_DELAY_MS);
     }

     /* warn about inconsistent options */
     if (c->mode == CM_P2P || c->mode == CM_TOP)
     {
         do_option_warnings(c);
     }

 #ifdef ENABLE_PLUGIN

     /* initialize plugins */
     if (c->mode == CM_P2P || c->mode == CM_TOP)
     {
         open_plugins(c, false, OPENVPN_PLUGIN_INIT_PRE_DAEMON);
     }

 #endif

     /* should we enable fast I/O? */
     if (c->mode == CM_P2P || c->mode == CM_TOP)
     {
         do_setup_fast_io(c);
     }

     /* should we throw a signal on TLS errors? */
     do_signal_on_tls_errors(c);

     /* open --status file */
     if (c->mode == CM_P2P || c->mode == CM_TOP)
     {
         do_open_status_output(c);
     }

     /* open --ifconfig-pool-persist file */
     if (c->mode == CM_TOP)
     {
         do_open_ifconfig_pool_persist(c);
     }

 
 #ifdef ENABLE_OCC

     /* reset OCC state */
     if (c->mode == CM_P2P || child)
     {
         c->c2.occ_op = occ_reset_op();
     }

 #endif
 

     /* our wait-for-i/o objects, different for posix vs. win32 */
     if (c->mode == CM_P2P)
     {
         do_event_set_init(c, SHAPER_DEFINED(&c->options));
     }
     else if (c->mode == CM_CHILD_TCP)
     {
         do_event_set_init(c, false);
     }

     /* initialize HTTP or SOCKS proxy object at scope level 2 */
     init_proxy(c);

     /* allocate our socket object */
     if (c->mode == CM_P2P || c->mode == CM_TOP || c->mode == CM_CHILD_TCP)
     {
         do_link_socket_new(c);
     }

 
 #ifdef ENABLE_FRAGMENT

     /* initialize internal fragmentation object */
     if (options->ce.fragment && (c->mode == CM_P2P || child))
     {
         c->c2.fragment = fragment_init(&c->c2.frame);
     }

 #endif
 

     /* init crypto layer */
     {
         unsigned int crypto_flags = 0;
         if (c->mode == CM_TOP)
         {
             crypto_flags = CF_INIT_TLS_AUTH_STANDALONE;
         }
         else if (c->mode == CM_P2P)
         {
             crypto_flags = CF_LOAD_PERSISTED_PACKET_ID | CF_INIT_TLS_MULTI;
         }
         else if (child)
         {
             crypto_flags = CF_INIT_TLS_MULTI;
         }
         do_init_crypto(c, crypto_flags);
         if (IS_SIG(c) && !child)
         {
             goto sig;
         }
     }

 #ifdef USE_COMP

     /* initialize compression library. */
     if (comp_enabled(&options->comp) && (c->mode == CM_P2P || child))
     {
         c->c2.comp_context = comp_init(&options->comp);
     }

 #endif
 

     /* initialize MTU variables */
     do_init_frame(c);

     /* initialize TLS MTU variables */
     do_init_frame_tls(c);

     /* init workspace buffers whose size is derived from frame size */
     if (c->mode == CM_P2P || c->mode == CM_CHILD_TCP)
     {
         do_init_buffers(c);
     }

 
 #ifdef ENABLE_FRAGMENT

     /* initialize internal fragmentation capability with known frame size */
     if (options->ce.fragment && (c->mode == CM_P2P || child))
     {
         do_init_fragment(c);
     }

 #endif
 

     /* initialize dynamic MTU variable */
     frame_init_mssfix(&c->c2.frame, &c->options);

     /* bind the TCP/UDP socket */
     if (c->mode == CM_P2P || c->mode == CM_TOP || c->mode == CM_CHILD_TCP)
     {
         do_init_socket_1(c, link_socket_mode);
     }

     /* initialize tun/tap device object,
      * open tun/tap device, ifconfig, run up script, etc. */
     if (!(options->up_delay || PULL_DEFINED(options)) && (c->mode == CM_P2P || c->mode == CM_TOP))
     {
         c->c2.did_open_tun = do_open_tun(c);
     }

     c->c2.frame_initial = c->c2.frame;
 

     /* print MTU info */
     do_print_data_channel_mtu_parms(c);

 
 #ifdef ENABLE_OCC

     /* get local and remote options compatibility strings */
     if (c->mode == CM_P2P || child)
     {
         do_compute_occ_strings(c);
     }

 #endif
 

     /* initialize output speed limiter */
     if (c->mode == CM_P2P)
     {
         do_init_traffic_shaper(c);
     }

     /* do one-time inits, and possibily become a daemon here */
     do_init_first_time(c);

 #ifdef ENABLE_PLUGIN

     /* initialize plugins */
     if (c->mode == CM_P2P || c->mode == CM_TOP)
     {
         open_plugins(c, false, OPENVPN_PLUGIN_INIT_POST_DAEMON);
     }

 #endif
 

     /* initialise connect timeout timer */
     do_init_server_poll_timeout(c);

     /* finalize the TCP/UDP socket */
     if (c->mode == CM_P2P || c->mode == CM_TOP || c->mode == CM_CHILD_TCP)
     {
         do_init_socket_2(c);
     }

     /*
      * Actually do UID/GID downgrade, and chroot, if requested.
      * May be delayed by --client, --pull, or --up-delay.
      */
     do_uid_gid_chroot(c, c->c2.did_open_tun);

     /* initialize timers */
     if (c->mode == CM_P2P || child)
     {
         do_init_timers(c, false);
     }

 #ifdef ENABLE_PLUGIN

     /* initialize plugins */
     if (c->mode == CM_P2P || c->mode == CM_TOP)
     {
         open_plugins(c, false, OPENVPN_PLUGIN_INIT_POST_UID_CHANGE);
     }

 #endif
 

 #if PORT_SHARE

     /* share OpenVPN port with foreign (such as HTTPS) server */
     if (c->first_time && (c->mode == CM_P2P || c->mode == CM_TOP))
     {
         init_port_share(c);
     }

 #endif

 #ifdef ENABLE_PF

     if (child)
     {
         pf_init_context(c);
     }

 #endif
 

     /* Check for signals */
     if (IS_SIG(c))
     {
         goto sig;
     }

     return;

 sig:
     if (!c->sig->signal_text)
     {
         c->sig->signal_text = "init_instance";
     }
     close_context(c, -1, flags);
     return;

 }
 
 /*
  * Close a tunnel instance.
  */
 void

 close_instance(struct context *c)

 {

     /* close event objects */
     do_close_event_set(c);

 
     if (c->mode == CM_P2P

         || c->mode == CM_CHILD_TCP
         || c->mode == CM_CHILD_UDP
         || c->mode == CM_TOP)
     {
         /* if xinetd/inetd mode, don't allow restart */
         do_close_check_if_restart_permitted(c);

 #ifdef USE_COMP

         if (c->c2.comp_context)
         {
             comp_uninit(c->c2.comp_context);
             c->c2.comp_context = NULL;
         }

 #endif
 

         /* free buffers */
         do_close_free_buf(c);

         /* close TLS */
         do_close_tls(c);

         /* free key schedules */
         do_close_free_key_schedule(c, (c->mode == CM_P2P || c->mode == CM_TOP));

         /* close TCP/UDP connection */
         do_close_link_socket(c);

         /* close TUN/TAP device */
         do_close_tun(c, false);

 #ifdef MANAGEMENT_DEF_AUTH

         if (management)
         {
             management_notify_client_close(management, &c->c2.mda_context, NULL);
         }

 #endif
 

 #ifdef ENABLE_PF

         pf_destroy_context(&c->c2.pf);

 #endif
 

 #ifdef ENABLE_PLUGIN

         /* call plugin close functions and unload */
         do_close_plugins(c);

 #endif

         /* close packet-id persistance file */
         do_close_packet_id(c);

         /* close --status file */
         do_close_status_output(c);

 
 #ifdef ENABLE_FRAGMENT

         /* close fragmentation handler */
         do_close_fragment(c);

 #endif
 

         /* close --ifconfig-pool-persist obj */
         do_close_ifconfig_pool_persist(c);

         /* free up environmental variable store */
         do_env_set_destroy(c);

         /* close HTTP or SOCKS proxy */
         uninit_proxy(c);

         /* garbage collect */
         gc_free(&c->c2.gc);
     }

 }
 
 void

 inherit_context_child(struct context *dest,
                       const struct context *src)

 {

     CLEAR(*dest);

     /* proto_is_dgram will ASSERT(0) if proto is invalid */
     dest->mode = proto_is_dgram(src->options.ce.proto) ? CM_CHILD_UDP : CM_CHILD_TCP;

     dest->gc = gc_new();

     ALLOC_OBJ_CLEAR_GC(dest->sig, struct signal_info, &dest->gc);

     /* c1 init */
     packet_id_persist_init(&dest->c1.pid_persist);

     dest->c1.ks.key_type = src->c1.ks.key_type;
     /* inherit SSL context */
     dest->c1.ks.ssl_ctx = src->c1.ks.ssl_ctx;
     dest->c1.ks.tls_wrap_key = src->c1.ks.tls_wrap_key;
     dest->c1.ks.tls_auth_key_type = src->c1.ks.tls_auth_key_type;
     /* inherit pre-NCP ciphers */
     dest->c1.ciphername = src->c1.ciphername;
     dest->c1.authname = src->c1.authname;
     dest->c1.keysize = src->c1.keysize;
 
     /* options */
     dest->options = src->options;
     options_detach(&dest->options);
 
     if (dest->mode == CM_CHILD_TCP)

     {

         /*
          * The CM_TOP context does the socket listen(),
          * and the CM_CHILD_TCP context does the accept().
          */
         dest->c2.accept_from = src->c2.link_socket;

     }
 

 #ifdef ENABLE_PLUGIN

     /* inherit plugins */
     do_inherit_plugins(dest, src);

 #endif

     /* context init */
     init_instance(dest, src->c2.es, CC_NO_CLOSE | CC_USR1_TO_HUP);
     if (IS_SIG(dest))
     {
         return;
     }

     /* inherit tun/tap interface object */
     dest->c1.tuntap = src->c1.tuntap;

     /* UDP inherits some extra things which TCP does not */
     if (dest->mode == CM_CHILD_UDP)

     {

         /* inherit buffers */
         dest->c2.buffers = src->c2.buffers;

         /* inherit parent link_socket and tuntap */
         dest->c2.link_socket = src->c2.link_socket;