l2tpns.h

   1 // L2TPNS Global Stuff
   2 // $Id: l2tpns.h,v 1.19 2004-10-04 23:34:07 fred_nerk Exp $
   3
   4 #ifndef __L2TPNS_H__
   5 #define __L2TPNS_H__
   6
   7 #include <netinet/in.h>
   8 #include <execinfo.h>
   9 #include <stdio.h>
  10 #include <signal.h>
  11 #include <stdlib.h>
  12 #include <netinet/in.h>
  13 #include <sys/socket.h>
  14 #include <arpa/inet.h>
  15 #include <sys/types.h>
  16 #include <libcli.h>
  17
  18 #define VERSION "2.0.1"
  19
  20 // Limits
  21 #define MAXTUNNEL       500             // could be up to 65535
  22 #define MAXSESSION      50000           // could be up to 65535
  23 #define MAXTBFS         6000            // Maximum token bucket filters. Might need up to 2 * session.
  24
  25 #define RADIUS_SHIFT    5
  26 #define RADIUS_MASK     ((unsigned short)(((unsigned short)~0) >> (16 - RADIUS_SHIFT)))
  27 #define MAXRADIUS       ((unsigned long)(1L << RADIUS_SHIFT) * 255)
  28
  29 #define T_UNDEF         (0xffff)        // A tunnel ID that won't ever be used. Mark session as undefined.
  30 #define T_FREE          (0)             // A tunnel ID that won't ever be used. Mark session as free.
  31
  32 #define MAXCONTROL      1000            // max length control message we ever send...
  33 #define MAXETHER        (1500+18)       // max packet we try sending to tun
  34 #define MAXTEL          96              // telephone number
  35 #define MAXPLUGINS      20              // maximum number of plugins to load
  36 #define MAXRADSERVER    10              // max radius servers
  37 #define MAXROUTE        10              // max static routes per session
  38 #define MAXIPPOOL       131072          // max number of ip addresses in pool
  39 #define RINGBUFFER_SIZE 10000           // Number of ringbuffer entries to allocate
  40 #define MAX_LOG_LENGTH  512             // Maximum size of log message
  41 #define ECHO_TIMEOUT    60              // Time between last packet sent and LCP ECHO generation
  42 #define IDLE_TIMEOUT    240             // Time between last packet sent and LCP ECHO generation
  43 #define BUSY_WAIT_TIMEOUT       3000    // 5 minutes in 1/10th seconds to wait for radius to cleanup on shutdown
  44
  45 // Constants
  46 #include "config.h"
  47 #ifndef PLUGINDIR
  48 #define PLUGINDIR       LIBDIR                  // Plugins
  49 #endif
  50
  51 #ifndef PLUGINCONF
  52 #define PLUGINCONF      ETCDIR                  // Plugin config dir
  53 #endif
  54
  55 #ifndef DATADIR
  56 #define DATADIR         "/tmp"
  57 #endif
  58
  59 #ifndef FLASHDIR
  60 #define FLASHDIR        ETCDIR
  61 #endif
  62
  63 #define TUNDEVICE       "/dev/net/tun"
  64 #define STATEFILE       DATADIR "/state.dump"           // State dump file
  65 #define CONFIGFILE      FLASHDIR "/startup-config"      // Configuration file
  66 #define CLIUSERS        FLASHDIR "/users"               // CLI Users file
  67 #define IPPOOLFILE      FLASHDIR "/ip_pool"             // Address pool configuration
  68 #define ACCT_TIME       3000            // 5 minute accounting interval
  69 #define L2TPPORT        1701            // L2TP port
  70 #define RADPORT         1645            // old radius port...
  71 #define PKTARP          0x0806          // ARP packet type
  72 #define PKTIP           0x0800          // IP packet type
  73 #define PSEUDOMAC       0x0200          // pseudo MAC prefix (local significant MAC)
  74 #define PPPPAP          0xC023
  75 #define PPPCHAP         0xC223
  76 #define PPPLCP          0xC021
  77 #define PPPIPCP         0x8021
  78 #define PPPCCP          0x80FD
  79 #define PPPIP           0x0021
  80 #define PPPMP           0x003D
  81 #define MIN_IP_SIZE     0x19
  82 enum
  83 {
  84         ConfigReq = 1,
  85         ConfigAck,
  86         ConfigNak,
  87         ConfigRej,
  88         TerminateReq,
  89         TerminateAck,
  90         CodeRej,
  91         ProtocolRej,
  92         EchoReq,
  93         EchoReply,
  94         DiscardRequest,
  95         IdentRequest
  96 };
  97
  98 // Types
  99 typedef unsigned short u16;
 100 typedef unsigned int u32;
 101 typedef unsigned char u8;
 102 typedef u32 ipt;
 103 typedef u16 portt;
 104 typedef u16 sessionidt;
 105 typedef u16 tunnelidt;
 106 typedef u32 clockt;
 107 typedef u8 hasht[16];
 108
 109 // CLI actions
 110 struct cli_session_actions {
 111         char action;
 112         ipt snoop_ip;
 113         u16 snoop_port;
 114         int throttle;
 115 };
 116
 117 #define CLI_SESS_KILL           0x01
 118 #define CLI_SESS_SNOOP          0x02
 119 #define CLI_SESS_NOSNOOP        0x04
 120 #define CLI_SESS_THROTTLE       0x08
 121 #define CLI_SESS_NOTHROTTLE     0x10
 122
 123 struct cli_tunnel_actions {
 124         char action;
 125 };
 126
 127 #define CLI_TUN_KILL            0x01
 128
 129 // dump header: update number if internal format changes
 130 #define DUMP_MAGIC "L2TPNS#" VERSION "#"
 131
 132 // structures
 133 typedef struct routes           // route
 134 {
 135         ipt ip;
 136         ipt mask;
 137 }
 138 routet;
 139
 140 typedef struct controls         // control message
 141 {
 142         struct controls *next;  // next in queue
 143         u16 length;             // length
 144         u8 buf[MAXCONTROL];
 145 }
 146 controlt;
 147
 148 typedef struct sessions
 149 {
 150         sessionidt next;                // next session in linked list
 151         sessionidt far;                 // far end session ID
 152         tunnelidt tunnel;               // near end tunnel ID
 153         ipt ip;                         // IP of session set by RADIUS response (host byte order).
 154         int ip_pool_index;              // index to IP pool
 155         unsigned long unique_id;        // unique session id
 156         u16 nr;                         // next receive
 157         u16 ns;                         // next send
 158         u32 magic;                      // ppp magic number
 159         u32 cin, cout;                  // byte counts
 160         u32 pin, pout;                  // packet counts
 161         u32 total_cin;                  // This counter is never reset while a session is open
 162         u32 total_cout;                 // This counter is never reset while a session is open
 163         u32 id;                         // session id
 164         u32 throttle;                   // non-zero if this session is throttled.
 165         clockt opened;                  // when started
 166         clockt die;                     // being closed, when to finally free
 167         time_t last_packet;             // Last packet from the user (used for idle timeouts)
 168         ipt dns1, dns2;                 // DNS servers
 169         routet route[MAXROUTE];         // static routes
 170         u16 radius;                     // which radius session is being used (0 for not waiting on authentication)
 171         u16 mru;                        // maximum receive unit
 172         u16 tbf_in;                     // filter bucket for throttling in from the user.
 173         u16 tbf_out;                    // filter bucket for throttling out to the user.
 174         u8 l2tp_flags;                  // various bit flags from the ICCN on the l2tp tunnel.
 175         u8 reserved_old_snoop;          // No longer used - remove at some time
 176         u8 walled_garden;               // is this session gardened?
 177         u8 flags1;                      // additional flags (currently unused);
 178         char random_vector[MAXTEL];
 179         int random_vector_length;
 180         char user[129];                 // user (needed in seesion for radius stop messages) (can we reduce this? --mo)
 181         char called[MAXTEL];            // called number
 182         char calling[MAXTEL];           // calling number
 183         u32 tx_connect_speed;
 184         u32 rx_connect_speed;
 185         u32 flags;                      // Various session flags.
 186         ipt snoop_ip;                   // Interception destination IP
 187         u16 snoop_port;                 // Interception destination port
 188         u16 sid;                        // near end session id.
 189         char reserved[20];              // Space to expand structure without changing HB_VERSION
 190 }
 191 sessiont;
 192
 193 #define SF_IPCP_ACKED   (1<<0)          // Has this session seen an IPCP Ack?
 194
 195 typedef struct {
 196         u32     cin;
 197         u32     cout;
 198 } sessioncountt;
 199
 200 #define SESSIONPFC      1            // PFC negotiated flags
 201 #define SESSIONACFC     2           // ACFC negotiated flags
 202 #define SESSIONLCPACK   4       // LCP negotiated
 203
 204 // 168 bytes per tunnel
 205 typedef struct tunnels
 206 {
 207         tunnelidt far;          // far end tunnel ID
 208         ipt ip;                 // Ip for far end
 209         portt port;             // port for far end
 210         u16 window;             // Rx window
 211         u16 nr;                 // next receive
 212         u16 ns;                 // next send
 213         int state;              // current state (tunnelstate enum)
 214         clockt last;            // when last control message sent (used for resend timeout)
 215         clockt retry;           // when to try resenting pending control
 216         clockt die;             // being closed, when to finally free
 217         clockt lastrec;         // when the last control message was received
 218         char hostname[128];     // tunnel hostname
 219         char vendor[128];       // LAC vendor
 220         u8 try;                 // number of retrys on a control message
 221         u16 controlc;           // outstaind messages in queue
 222         controlt *controls;     // oldest message
 223         controlt *controle;     // newest message
 224 }
 225 tunnelt;
 226
 227 // 180 bytes per radius session
 228 typedef struct radiuss          // outstanding RADIUS requests
 229 {
 230         sessionidt session;     // which session this applies to
 231         hasht auth;             // request authenticator
 232         clockt retry;           // when to try next
 233         char calling[MAXTEL];   // calling number
 234         char pass[129];         // password
 235         u8 id;                  // ID for PPP response
 236         u8 try;                 // which try we are on
 237         u8 state;               // state of radius requests
 238         u8 chap;                // set if CHAP used (is CHAP identifier)
 239 }
 240 radiust;
 241
 242 typedef struct
 243 {
 244         ipt             address;        // Host byte order..
 245         char            assigned;       // 1 if assigned, 0 if free
 246         sessionidt      session;
 247         clockt          last;           // last used
 248         char            user[129];      // user (try to have ip addresses persistent)
 249 }
 250 ippoolt;
 251
 252 #ifdef RINGBUFFER
 253 struct Tringbuffer
 254 {
 255         struct {
 256                 char level;
 257                 sessionidt session;
 258                 tunnelidt tunnel;
 259                 ipt address;
 260                 char message[MAX_LOG_LENGTH];
 261         } buffer[RINGBUFFER_SIZE];
 262         int head;
 263         int tail;
 264 };
 265 #endif
 266
 267 /*
 268  * Possible tunnel states
 269  * TUNNELFREE -> TUNNELOPEN -> TUNNELDIE -> TUNNELFREE
 270  */
 271 enum
 272 {
 273         TUNNELFREE,             // Not in use
 274         TUNNELOPEN,             // Active tunnel
 275         TUNNELDIE,              // Currently closing
 276         TUNNELOPENING,          // Busy opening
 277         TUNNELUNDEF,            // Undefined
 278 };
 279
 280 enum
 281 {
 282         RADIUSNULL,             // Not in use
 283         RADIUSCHAP,             // sending CHAP down PPP
 284         RADIUSAUTH,             // sending auth to RADIUS server
 285         RADIUSIPCP,             // sending IPCP to end user
 286         RADIUSSTART,            // sending start accounting to RADIUS server
 287         RADIUSSTOP,             // sending stop accounting to RADIUS server
 288         RADIUSWAIT,             // waiting timeout before available, in case delayed replies
 289         RADIUSDEAD,             // errored while talking to radius server.
 290 };
 291
 292 struct Tstats
 293 {
 294     time_t              start_time;
 295     time_t              last_reset;
 296
 297     unsigned long       tun_rx_packets;
 298     unsigned long       tun_tx_packets;
 299     unsigned long       tun_rx_bytes;
 300     unsigned long       tun_tx_bytes;
 301     unsigned long       tun_rx_errors;
 302     unsigned long       tun_tx_errors;
 303
 304     unsigned long       tunnel_rx_packets;
 305     unsigned long       tunnel_tx_packets;
 306     unsigned long       tunnel_rx_bytes;
 307     unsigned long       tunnel_tx_bytes;
 308     unsigned long       tunnel_rx_errors;
 309     unsigned long       tunnel_tx_errors;
 310
 311     unsigned long       tunnel_retries;
 312     unsigned long       radius_retries;
 313
 314     unsigned long       arp_sent;
 315
 316     unsigned long       packets_snooped;
 317
 318     unsigned long       tunnel_created;
 319     unsigned long       session_created;
 320     unsigned long       tunnel_timeout;
 321     unsigned long       session_timeout;
 322     unsigned long       radius_timeout;
 323     unsigned long       radius_overflow;
 324     unsigned long       tunnel_overflow;
 325     unsigned long       session_overflow;
 326
 327     unsigned long       ip_allocated;
 328     unsigned long       ip_freed;
 329
 330     unsigned long       c_forwarded;
 331     unsigned long       recv_forward;
 332 #ifdef STATISTICS
 333     unsigned long       call_processtun;
 334     unsigned long       call_processipout;
 335     unsigned long       call_processudp;
 336     unsigned long       call_sessionbyip;
 337     unsigned long       call_sessionbyuser;
 338     unsigned long       call_sendarp;
 339     unsigned long       call_sendipcp;
 340     unsigned long       call_tunnelsend;
 341     unsigned long       call_sessionkill;
 342     unsigned long       call_sessionshutdown;
 343     unsigned long       call_tunnelkill;
 344     unsigned long       call_tunnelshutdown;
 345     unsigned long       call_assign_ip_address;
 346     unsigned long       call_free_ip_address;
 347     unsigned long       call_dump_acct_info;
 348     unsigned long       call_sessionsetup;
 349     unsigned long       call_processpap;
 350     unsigned long       call_processchap;
 351     unsigned long       call_processlcp;
 352     unsigned long       call_processipcp;
 353     unsigned long       call_processipin;
 354     unsigned long       call_processccp;
 355     unsigned long       call_sendchap;
 356     unsigned long       call_processrad;
 357     unsigned long       call_radiussend;
 358     unsigned long       call_radiusretry;
 359 #endif
 360 };
 361
 362 #ifdef STATISTICS
 363
 364 #ifdef STAT_CALLS
 365 #define CSTAT(x)        STAT(x)
 366 #else
 367 #define CSTAT(x)
 368 #endif
 369
 370 #define STAT(x)         (_statistics->x++)
 371 #define INC_STAT(x,y)   (_statistics->x += (y))
 372 #define GET_STAT(x)     (_statistics->x)
 373 #define SET_STAT(x, y)  (_statistics->x = (y))
 374 #else
 375 #define CSTAT(x)
 376 #define STAT(x)
 377 #define INC_STAT(x,y)
 378 #define GET_STAT(x)     0
 379 #define SET_STAT(x, y)
 380 #endif
 381
 382 struct configt
 383 {
 384         int             debug;                          // debugging level
 385         time_t          start_time;                     // time when l2tpns was started
 386         char            bandwidth[256];                 // current bandwidth
 387         char            pid_file[256];                  // file to write PID to on startup
 388         int             wrote_pid;
 389         clockt          current_time;                   // 1/10ths of a second since the process started.
 390                                                         // means that we can only run a given process
 391                                                         // for 13 years without re-starting!
 392
 393         char            config_file[128];
 394         int             reload_config;                  // flag to re-read config (set by cli)
 395         int             cleanup_interval;               // interval between regular cleanups (in seconds)
 396         int             multi_read_count;               // amount of packets to read per fd in processing loop
 397
 398         char            tundevice[10];                  // tun device name
 399         char            log_filename[128];
 400         char            l2tpsecret[64];
 401
 402         char            radiussecret[64];
 403         int             radius_accounting;
 404         ipt             radiusserver[MAXRADSERVER];     // radius servers
 405         u16             radiusport[MAXRADSERVER];       // radius base ports
 406         u8              numradiusservers;               // radius server count
 407         short           num_radfds;                     // Number of radius filehandles allocated
 408
 409         ipt             default_dns1, default_dns2;
 410
 411         unsigned long   rl_rate;
 412         int             save_state;
 413         char            accounting_dir[128];
 414         ipt             bind_address;
 415         int             send_garp;                      // Set to true to garp for vip address on startup
 416
 417         int             target_uid;
 418         int             dump_speed;
 419         char            plugins[64][MAXPLUGINS];
 420         char            old_plugins[64][MAXPLUGINS];
 421
 422         int             next_tbf;                       // Next HTB id available to use
 423         int             scheduler_fifo;                 // If the system has multiple CPUs, use FIFO scheduling policy for this process.
 424         int             lock_pages;                     // Lock pages into memory.
 425         int             icmp_rate;                      // Max number of ICMP unreachable per second to send>
 426
 427         u32             cluster_address;                // Multicast address of cluster.
 428                                                         // Send to this address to have everyone hear.
 429         char            cluster_interface[64];          // Which interface to listen for multicast on.
 430         int             cluster_iam_master;             // Are we the cluster master???
 431         int             cluster_iam_uptodate;           // Set if we've got a full set of state from the master.
 432         u32             cluster_master_address;         // The network address of the cluster master.
 433                                                         // Zero if i am the cluster master.
 434         int             cluster_seq_number;             // Sequence number of the next heartbeat we'll send out
 435                                                         // (or the seq number we're next expecting if we're a slave).
 436         int             cluster_undefined_sessions;     // How many sessions we're yet to receive from the master.
 437         int             cluster_undefined_tunnels;      // How many tunnels we're yet to receive from the master.
 438         int             cluster_highest_sessionid;
 439         int             cluster_highest_tunnelid;
 440         clockt          cluster_last_hb;                // Last time we saw a heartbeat from the master.
 441         int             cluster_num_changes;            // Number of changes queued.
 442
 443         int             cluster_hb_interval;            // How often to send a heartbeat.
 444         int             cluster_hb_timeout;             // How many missed heartbeats trigger an election.
 445
 446 #ifdef BGP
 447         u16             as_number;
 448         char            bgp_peer[2][64];
 449         u16             bgp_peer_as[2];
 450 #endif
 451         char            hostname[256];                  // our hostname - set to gethostname() by default
 452 };
 453
 454 struct config_descriptt
 455 {
 456         char *key;
 457         int offset;
 458         int size;
 459         enum { INT, STRING, UNSIGNED_LONG, SHORT, BOOL, IP, MAC } type;
 460 };
 461
 462 // arp.c
 463 void sendarp(int ifr_idx, const unsigned char* mac, ipt ip);
 464
 465
 466 // ppp.c
 467 void processpap(tunnelidt t, sessionidt s, u8 * p, u16 l);
 468 void processchap(tunnelidt t, sessionidt s, u8 * p, u16 l);
 469 void processlcp(tunnelidt t, sessionidt s, u8 * p, u16 l);
 470 void processipcp(tunnelidt t, sessionidt s, u8 * p, u16 l);
 471 void processipin(tunnelidt t, sessionidt s, u8 * p, u16 l);
 472 void processccp(tunnelidt t, sessionidt s, u8 * p, u16 l);
 473 void sendchap(tunnelidt t, sessionidt s);
 474 u8 *makeppp(u8 * b, int size, u8 * p, int l, tunnelidt t, sessionidt s, u16 mtype);
 475 u8 *findppp(u8 * b, u8 mtype);
 476 void initlcp(tunnelidt t, sessionidt s);
 477 void dumplcp(u8 *p, int l);
 478
 479
 480 // radius.c
 481 void initrad(void);
 482 void radiussend(u16 r, u8 state);
 483 void processrad(u8 *buf, int len, char socket_index);
 484 void radiusretry(u16 r);
 485 u16 radiusnew(sessionidt s);
 486 void radiusclear(u16 r, sessionidt s);
 487
 488 // throttle.c
 489 int throttle_session(sessionidt s, int throttle);
 490
 491
 492 // rl.c
 493 void init_rl();
 494 u16 rl_create_tbf();
 495 u16 rl_get_tbf();
 496 void rl_done_tbf(u16 t);
 497 void rl_destroy_tbf(u16 t);
 498
 499
 500 // l2tpns.c
 501 clockt now(void);
 502 clockt backoff(u8 try);
 503 void routeset(sessionidt, ipt ip, ipt mask, ipt gw, u8 add);
 504 void inittun(void);
 505 void initudp(void);
 506 void initdata(void);
 507 void initippool();
 508 sessionidt sessionbyip(ipt ip);
 509 sessionidt sessionbyuser(char *username);
 510 void sessionshutdown(sessionidt s, char *reason);
 511 void sessionsendarp(sessionidt s);
 512 void send_garp(ipt ip);
 513 void sessionkill(sessionidt s, char *reason);
 514 void control16(controlt * c, u16 avp, u16 val, u8 m);
 515 void control32(controlt * c, u16 avp, u32 val, u8 m);
 516 void controls(controlt * c, u16 avp, char *val, u8 m);
 517 void controlb(controlt * c, u16 avp, char *val, unsigned int len, u8 m);
 518 controlt *controlnew(u16 mtype);
 519 void controlnull(tunnelidt t);
 520 void controladd(controlt * c, tunnelidt t, sessionidt s);
 521 void tunnelsend(u8 * buf, u16 l, tunnelidt t);
 522 void tunnelkill(tunnelidt t, char *reason);
 523 void tunnelshutdown(tunnelidt t, char *reason);
 524 void sendipcp(tunnelidt t, sessionidt s);
 525 void processipout(u8 * buf, int len);
 526 void processarp(u8 * buf, int len);
 527 void processudp(u8 * buf, int len, struct sockaddr_in *addr);
 528 void processtun(u8 * buf, int len);
 529 void processcontrol(u8 * buf, int len, struct sockaddr_in *addr);
 530 int assign_ip_address(sessionidt s);
 531 void free_ip_address(sessionidt s);
 532 void snoop_send_packet(char *packet, u16 size, ipt destination, u16 port);
 533 void dump_acct_info();
 534 void mainloop(void);
 535 int cmd_show_ipcache(struct cli_def *cli, char *command, char **argv, int argc);
 536 int cmd_show_hist_idle(struct cli_def *cli, char *command, char **argv, int argc);
 537 int cmd_show_hist_open(struct cli_def *cli, char *command, char **argv, int argc);
 538
 539 #define log _log
 540 #ifndef log_hex
 541 #define log_hex(a,b,c,d) do{if (a <= config->debug) _log_hex(a,0,0,0,b,c,d);}while (0)
 542 #endif
 543 void _log(int level, ipt address, sessionidt s, tunnelidt t, const char *format, ...) __attribute__((format (printf, 5, 6)));
 544 void _log_hex(int level, ipt address, sessionidt s, tunnelidt t, const char *title, const char *data, int maxsize);
 545 void build_chap_response(char *challenge, u8 id, u16 challenge_length, char **challenge_response);
 546 int sessionsetup(tunnelidt t, sessionidt s);
 547 int cluster_send_session(int s);
 548 int cluster_send_tunnel(int t);
 549 int cluster_send_goodbye();
 550 void init_cli();
 551 void cli_do_file(FILE *fh);
 552 void cli_do(int sockfd);
 553 int cli_arg_help(struct cli_def *cli, int cr_ok, char *entry, ...);
 554 #ifdef RINGBUFFER
 555 void ringbuffer_dump(FILE *stream);
 556 #endif
 557 void initplugins(void);
 558 int run_plugins(int plugin_type, void *data);
 559 void add_plugin(char *plugin_name);
 560 void remove_plugin(char *plugin_name);
 561 void plugins_done(void);
 562 void tunnelclear(tunnelidt t);
 563 void host_unreachable(ipt destination, u16 id, ipt source, char *packet, int packet_len);
 564 void fix_address_pool(int sid);
 565 void rebuild_address_pool(void);
 566 void send_ipin(sessionidt s, u8 * buf, int len);
 567 int throttle_session(sessionidt s, int throttle);
 568 int load_session(sessionidt, sessiont *);
 569 void become_master(void);       // We're the master; kick off any required master initializations.
 570 extern tunnelt *tunnel;
 571 extern sessiont *session;
 572 extern sessioncountt *sess_count;
 573 extern ippoolt *ip_address_pool;
 574 #define sessionfree (session[0].next)
 575
 576 #define log_backtrace(count, max) \
 577 if (count++ < max) { \
 578         void *array[20]; \
 579         char **strings; \
 580         int size, i; \
 581         log(0, 0, 0, t, "Backtrace follows"); \
 582         size = backtrace(array, 10); \
 583         strings = backtrace_symbols(array, size); \
 584         if (strings) for (i = 0; i < size; i++) \
 585         { \
 586                 log(0, 0, 0, t, "%s\n", strings[i]); \
 587         } \
 588         free(strings); \
 589 }
 590
 591
 592 extern struct configt *config;
 593 extern time_t basetime;         // Time when this process started.
 594 extern time_t time_now;         // Seconds since EPOCH.
 595 extern u32 last_id;
 596 extern struct Tstats *_statistics;
 597 extern ipt my_address;
 598 extern int tun_write(u8 *data, int size);
 599
 600
 601 #define TIME (config->current_time)
 602
 603 // macros for handling help in cli commands
 604 #define CLI_HELP_REQUESTED      (argc > 0 && argv[argc-1][strlen(argv[argc-1])-1] == '?')
 605 #define CLI_HELP_NO_ARGS        (argc > 1 || argv[0][1]) ? CLI_OK : cli_arg_help(cli, 1, NULL)
 606
 607 // CVS identifiers (for "show version file")
 608 extern char const *cvs_id_arp;
 609 extern char const *cvs_id_cli;
 610 extern char const *cvs_id_cluster;
 611 extern char const *cvs_id_constants;
 612 extern char const *cvs_id_control;
 613 extern char const *cvs_id_icmp;
 614 extern char const *cvs_id_l2tpns;
 615 extern char const *cvs_id_ll;
 616 extern char const *cvs_id_md5;
 617 extern char const *cvs_id_ppp;
 618 extern char const *cvs_id_radius;
 619 extern char const *cvs_id_tbf;
 620 extern char const *cvs_id_util;
 621
 622 #endif /* __L2TPNS_H__ */