release/src/router/pppd/pppd/pppd.h

   1 /*
   2  * pppd.h - PPP daemon global declarations.
   3  *
   4  * Copyright (c) 1984-2000 Carnegie Mellon University. All rights reserved.
   5  *
   6  * Redistribution and use in source and binary forms, with or without
   7  * modification, are permitted provided that the following conditions
   8  * are met:
   9  *
  10  * 1. Redistributions of source code must retain the above copyright
  11  *    notice, this list of conditions and the following disclaimer.
  12  *
  13  * 2. Redistributions in binary form must reproduce the above copyright
  14  *    notice, this list of conditions and the following disclaimer in
  15  *    the documentation and/or other materials provided with the
  16  *    distribution.
  17  *
  18  * 3. The name "Carnegie Mellon University" must not be used to
  19  *    endorse or promote products derived from this software without
  20  *    prior written permission. For permission or any legal
  21  *    details, please contact
  22  *      Office of Technology Transfer
  23  *      Carnegie Mellon University
  24  *      5000 Forbes Avenue
  25  *      Pittsburgh, PA  15213-3890
  26  *      (412) 268-4387, fax: (412) 268-7395
  27  *      tech-transfer@andrew.cmu.edu
  28  *
  29  * 4. Redistributions of any form whatsoever must retain the following
  30  *    acknowledgment:
  31  *    "This product includes software developed by Computing Services
  32  *     at Carnegie Mellon University (http://www.cmu.edu/computing/)."
  33  *
  34  * CARNEGIE MELLON UNIVERSITY DISCLAIMS ALL WARRANTIES WITH REGARD TO
  35  * THIS SOFTWARE, INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY
  36  * AND FITNESS, IN NO EVENT SHALL CARNEGIE MELLON UNIVERSITY BE LIABLE
  37  * FOR ANY SPECIAL, INDIRECT OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
  38  * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN
  39  * AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING
  40  * OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
  41  *
  42  * $Id: pppd.h,v 1.96 2008/06/23 11:47:18 paulus Exp $
  43  */
  44
  45 /*
  46  * TODO:
  47  */
  48
  49 #ifndef __PPPD_H__
  50 #define __PPPD_H__
  51
  52 #include <stdio.h>              /* for FILE */
  53 #include <limits.h>             /* for NGROUPS_MAX */
  54 #include <sys/param.h>          /* for MAXPATHLEN and BSD4_4, if defined */
  55 #include <sys/types.h>          /* for u_int32_t, if defined */
  56 #include <sys/time.h>           /* for struct timeval */
  57 #include <net/ppp_defs.h>
  58 #include "patchlevel.h"
  59
  60 #if defined(__STDC__)
  61 #include <stdarg.h>
  62 #define __V(x)  x
  63 #else
  64 #include <varargs.h>
  65 #define __V(x)  (va_alist) va_dcl
  66 #define const
  67 #define volatile
  68 #endif
  69
  70 #ifdef INET6
  71 #include "eui64.h"
  72 #endif
  73
  74 /*
  75  * Limits.
  76  */
  77
  78 #define NUM_PPP         1       /* One PPP interface supported (per process) */
  79 #define MAXWORDLEN      1024    /* max length of word in file (incl null) */
  80 #define MAXARGS         1       /* max # args to a command */
  81 #define MAXNAMELEN      256     /* max length of hostname or name for auth */
  82 #define MAXSECRETLEN    256     /* max length of password or secret */
  83 #define MAXUNIT         255     /* max ppp interface */
  84
  85 /*
  86  * Option descriptor structure.
  87  */
  88
  89 typedef unsigned char   bool;
  90
  91 enum opt_type {
  92         o_special_noarg = 0,
  93         o_special = 1,
  94         o_bool,
  95         o_int,
  96         o_uint32,
  97         o_string,
  98         o_wild
  99 };
 100
 101 typedef struct {
 102         char    *name;          /* name of the option */
 103         enum opt_type type;
 104         void    *addr;
 105         char    *description;
 106         unsigned int flags;
 107         void    *addr2;
 108         int     upper_limit;
 109         int     lower_limit;
 110         const char *source;
 111         short int priority;
 112         short int winner;
 113 } option_t;
 114
 115 /* Values for flags */
 116 #define OPT_VALUE       0xff    /* mask for presupplied value */
 117 #define OPT_HEX         0x100   /* int option is in hex */
 118 #define OPT_NOARG       0x200   /* option doesn't take argument */
 119 #define OPT_OR          0x400   /* for u32, OR in argument to value */
 120 #define OPT_INC         0x400   /* for o_int, increment value */
 121 #define OPT_A2OR        0x800   /* for o_bool, OR arg to *(u_char *)addr2 */
 122 #define OPT_PRIV        0x1000  /* privileged option */
 123 #define OPT_STATIC      0x2000  /* string option goes into static array */
 124 #define OPT_NOINCR      0x2000  /* for o_int, value mustn't be increased */
 125 #define OPT_LLIMIT      0x4000  /* check value against lower limit */
 126 #define OPT_ULIMIT      0x8000  /* check value against upper limit */
 127 #define OPT_LIMITS      (OPT_LLIMIT|OPT_ULIMIT)
 128 #define OPT_ZEROOK      0x10000 /* 0 value is OK even if not within limits */
 129 #define OPT_HIDE        0x10000 /* for o_string, print value as ?????? */
 130 #define OPT_A2LIST      0x20000 /* for o_special, keep list of values */
 131 #define OPT_A2CLRB      0x20000 /* o_bool, clr val bits in *(u_char *)addr2 */
 132 #define OPT_ZEROINF     0x40000 /* with OPT_NOINCR, 0 == infinity */
 133 #define OPT_PRIO        0x80000 /* process option priorities for this option */
 134 #define OPT_PRIOSUB     0x100000 /* subsidiary member of priority group */
 135 #define OPT_ALIAS       0x200000 /* option is alias for previous option */
 136 #define OPT_A2COPY      0x400000 /* addr2 -> second location to rcv value */
 137 #define OPT_ENABLE      0x800000 /* use *addr2 as enable for option */
 138 #define OPT_A2CLR       0x1000000 /* clear *(bool *)addr2 */
 139 #define OPT_PRIVFIX     0x2000000 /* user can't override if set by root */
 140 #define OPT_INITONLY    0x4000000 /* option can only be set in init phase */
 141 #define OPT_DEVEQUIV    0x8000000 /* equiv to device name */
 142 #define OPT_DEVNAM      (OPT_INITONLY | OPT_DEVEQUIV)
 143 #define OPT_A2PRINTER   0x10000000 /* *addr2 is a fn for printing option */
 144 #define OPT_A2STRVAL    0x20000000 /* *addr2 points to current string value */
 145 #define OPT_NOPRINT     0x40000000 /* don't print this option at all */
 146
 147 #define OPT_VAL(x)      ((x) & OPT_VALUE)
 148
 149 /* Values for priority */
 150 #define OPRIO_DEFAULT   0       /* a default value */
 151 #define OPRIO_CFGFILE   1       /* value from a configuration file */
 152 #define OPRIO_CMDLINE   2       /* value from the command line */
 153 #define OPRIO_SECFILE   3       /* value from options in a secrets file */
 154 #define OPRIO_ROOT      100     /* added to priority if OPT_PRIVFIX && root */
 155
 156 #ifndef GIDSET_TYPE
 157 #define GIDSET_TYPE     gid_t
 158 #endif
 159
 160 /* Structure representing a list of permitted IP addresses. */
 161 struct permitted_ip {
 162     int         permit;         /* 1 = permit, 0 = forbid */
 163     u_int32_t   base;           /* match if (addr & mask) == base */
 164     u_int32_t   mask;           /* base and mask are in network byte order */
 165 };
 166
 167 /*
 168  * Unfortunately, the linux kernel driver uses a different structure
 169  * for statistics from the rest of the ports.
 170  * This structure serves as a common representation for the bits
 171  * pppd needs.
 172  */
 173 struct pppd_stats {
 174     unsigned int        bytes_in;
 175     unsigned int        bytes_out;
 176     unsigned int        pkts_in;
 177     unsigned int        pkts_out;
 178 };
 179
 180 /* Used for storing a sequence of words.  Usually malloced. */
 181 struct wordlist {
 182     struct wordlist     *next;
 183     char                *word;
 184 };
 185
 186 /* An endpoint discriminator, used with multilink. */
 187 #define MAX_ENDP_LEN    20      /* maximum length of discriminator value */
 188 struct epdisc {
 189     unsigned char       class;
 190     unsigned char       length;
 191     unsigned char       value[MAX_ENDP_LEN];
 192 };
 193
 194 /* values for epdisc.class */
 195 #define EPD_NULL        0       /* null discriminator, no data */
 196 #define EPD_LOCAL       1
 197 #define EPD_IP          2
 198 #define EPD_MAC         3
 199 #define EPD_MAGIC       4
 200 #define EPD_PHONENUM    5
 201
 202 typedef void (*notify_func) __P((void *, int));
 203
 204 struct notifier {
 205     struct notifier *next;
 206     notify_func     func;
 207     void            *arg;
 208 };
 209
 210 /*
 211  * Global variables.
 212  */
 213 extern bool tx_only;                    /* JYWeng 20031216: idle time counting on tx traffic */
 214
 215 extern int      hungup;         /* Physical layer has disconnected */
 216 extern int      ifunit;         /* Interface unit number */
 217 extern char     ifname[];       /* Interface name */
 218 extern char     hostname[];     /* Our hostname */
 219 extern u_char   outpacket_buf[]; /* Buffer for outgoing packets */
 220 extern int      devfd;          /* fd of underlying device */
 221 extern int      fd_ppp;         /* fd for talking PPP */
 222 extern int      phase;          /* Current state of link - see values below */
 223 extern int      baud_rate;      /* Current link speed in bits/sec */
 224 extern char     *progname;      /* Name of this program */
 225 extern int      redirect_stderr;/* Connector's stderr should go to file */
 226 extern char     peer_authname[];/* Authenticated name of peer */
 227 extern int      auth_done[NUM_PPP]; /* Methods actually used for auth */
 228 extern int      privileged;     /* We were run by real-uid root */
 229 extern int      need_holdoff;   /* Need holdoff period after link terminates */
 230 extern char     **script_env;   /* Environment variables for scripts */
 231 extern int      detached;       /* Have detached from controlling tty */
 232 extern GIDSET_TYPE groups[NGROUPS_MAX]; /* groups the user is in */
 233 extern int      ngroups;        /* How many groups valid in groups */
 234 extern struct pppd_stats link_stats; /* byte/packet counts etc. for link */
 235 extern int      link_stats_valid; /* set if link_stats is valid */
 236 extern unsigned link_connect_time; /* time the link was up for */
 237 extern int      using_pty;      /* using pty as device (notty or pty opt.) */
 238 extern int      log_to_fd;      /* logging to this fd as well as syslog */
 239 extern bool     log_default;    /* log_to_fd is default (stdout) */
 240 extern char     *no_ppp_msg;    /* message to print if ppp not in kernel */
 241 extern volatile int status;     /* exit status for pppd */
 242 extern bool     devnam_fixed;   /* can no longer change devnam */
 243 extern int      unsuccess;      /* # unsuccessful connection attempts */
 244 extern int      do_callback;    /* set if we want to do callback next */
 245 extern int      doing_callback; /* set if this is a callback */
 246 extern int      error_count;    /* # of times error() has been called */
 247 extern char     ppp_devnam[MAXPATHLEN];
 248 extern char     remote_number[MAXNAMELEN]; /* Remote telephone number, if avail. */
 249 extern int      ppp_session_number; /* Session number (eg PPPoE session) */
 250 extern int      fd_devnull;     /* fd open to /dev/null */
 251
 252 extern int      listen_time;    /* time to listen first (ms) */
 253 extern bool     doing_multilink;
 254 extern bool     multilink_master;
 255 extern bool     bundle_eof;
 256 extern bool     bundle_terminating;
 257
 258 extern struct notifier *pidchange;   /* for notifications of pid changing */
 259 extern struct notifier *phasechange; /* for notifications of phase changes */
 260 extern struct notifier *exitnotify;  /* for notification that we're exiting */
 261 extern struct notifier *sigreceived; /* notification of received signal */
 262 extern struct notifier *ip_up_notifier; /* IPCP has come up */
 263 extern struct notifier *ip_down_notifier; /* IPCP has gone down */
 264 extern struct notifier *auth_up_notifier; /* peer has authenticated */
 265 extern struct notifier *link_down_notifier; /* link has gone down */
 266 extern struct notifier *fork_notifier;  /* we are a new child process */
 267
 268 /* Values for do_callback and doing_callback */
 269 #define CALLBACK_DIALIN         1       /* we are expecting the call back */
 270 #define CALLBACK_DIALOUT        2       /* we are dialling out to call back */
 271
 272 /*
 273  * Variables set by command-line options.
 274  */
 275
 276 extern bool     nochecktime;    /* Don't check time */
 277 extern int      debug;          /* Debug flag */
 278 extern int      kdebugflag;     /* Tell kernel to print debug messages */
 279 extern int      default_device; /* Using /dev/tty or equivalent */
 280 extern char     devnam[MAXPATHLEN];     /* Device name */
 281 extern int      crtscts;        /* Use hardware flow control */
 282 extern bool     modem;          /* Use modem control lines */
 283 extern int      inspeed;        /* Input/Output speed requested */
 284 extern u_int32_t netmask;       /* IP netmask to set on interface */
 285 extern bool     lockflag;       /* Create lock file to lock the serial dev */
 286 extern bool     nodetach;       /* Don't detach from controlling tty */
 287 extern bool     updetach;       /* Detach from controlling tty when link up */
 288 extern char     *initializer;   /* Script to initialize physical link */
 289 extern char     *connect_script; /* Script to establish physical link */
 290 extern char     *disconnect_script; /* Script to disestablish physical link */
 291 extern char     *welcomer;      /* Script to welcome client after connection */
 292 extern char     *ptycommand;    /* Command to run on other side of pty */
 293 extern int      maxconnect;     /* Maximum connect time (seconds) */
 294 extern char     user[MAXNAMELEN];/* Our name for authenticating ourselves */
 295 extern char     passwd[MAXSECRETLEN];   /* Password for PAP or CHAP */
 296 extern bool     auth_required;  /* Peer is required to authenticate */
 297 extern bool     persist;        /* Reopen link after it goes down */
 298 extern bool     uselogin;       /* Use /etc/passwd for checking PAP */
 299 extern bool     session_mgmt;   /* Do session management (login records) */
 300 extern char     our_name[MAXNAMELEN];/* Our name for authentication purposes */
 301 extern char     remote_name[MAXNAMELEN]; /* Peer's name for authentication */
 302 extern bool     explicit_remote;/* remote_name specified with remotename opt */
 303 extern bool     demand;         /* Do dial-on-demand */
 304 extern char     *ipparam;       /* Extra parameter for ip up/down scripts */
 305 extern char     *chapseccustom; /* Custom chap-secrets file */
 306 extern bool     cryptpap;       /* Others' PAP passwords are encrypted */
 307 extern int      idle_time_limit;/* Shut down link if idle for this long */
 308 extern int      holdoff;        /* Dead time before restarting */
 309 extern bool     holdoff_specified; /* true if user gave a holdoff value */
 310 extern bool     notty;          /* Stdin/out is not a tty */
 311 extern char     *pty_socket;    /* Socket to connect to pty */
 312 extern bool     sync_serial;    /* Device is synchronous serial device */
 313 extern int      maxfail;        /* Max # of unsuccessful connection attempts */
 314 extern char     linkname[MAXPATHLEN]; /* logical name for link */
 315 extern bool     tune_kernel;    /* May alter kernel settings as necessary */
 316 extern int      connect_delay;  /* Time to delay after connect script */
 317 extern int      max_data_rate;  /* max bytes/sec through charshunt */
 318 extern int      req_unit;       /* interface unit number to use */
 319 extern int      req_minunit;    /* interface minimal unit number to use */
 320 extern char     path_ipup[MAXPATHLEN]; /* pathname of ip-up script */
 321 extern char     path_ipdown[MAXPATHLEN]; /* pathname of ip-down script */
 322 extern bool     multilink;      /* enable multilink operation */
 323 extern bool     noendpoint;     /* don't send or accept endpt. discrim. */
 324 extern char     *bundle_name;   /* bundle name for multilink */
 325 extern bool     dump_options;   /* print out option values */
 326 extern bool     dryrun;         /* check everything, print options, exit */
 327 extern int      child_wait;     /* # seconds to wait for children at end */
 328 #ifdef CHAPMS
 329 extern bool     ms_ignore_domain; /* Ignore any MS domain prefix */
 330 #endif
 331
 332 #ifdef MAXOCTETS
 333 extern unsigned int maxoctets;       /* Maximum octetes per session (in bytes) */
 334 extern int       maxoctets_dir;      /* Direction :
 335                                       0 - in+out (default)
 336                                       1 - in
 337                                       2 - out
 338                                       3 - max(in,out) */
 339 extern int       maxoctets_timeout;  /* Timeout for check of octets limit */
 340 #define PPP_OCTETS_DIRECTION_SUM        0
 341 #define PPP_OCTETS_DIRECTION_IN         1
 342 #define PPP_OCTETS_DIRECTION_OUT        2
 343 #define PPP_OCTETS_DIRECTION_MAXOVERAL  3
 344 /* same as previos, but little different on RADIUS side */
 345 #define PPP_OCTETS_DIRECTION_MAXSESSION 4
 346 #endif
 347
 348 #ifdef PPP_FILTER
 349 extern struct   bpf_program pass_filter;   /* Filter for pkts to pass */
 350 extern struct   bpf_program active_filter; /* Filter for link-active pkts */
 351 #endif
 352
 353 #ifdef MSLANMAN
 354 extern bool     ms_lanman;      /* Use LanMan password instead of NT */
 355                                 /* Has meaning only with MS-CHAP challenges */
 356 #endif
 357
 358 /* Values for auth_pending, auth_done */
 359 #define PAP_WITHPEER    0x1
 360 #define PAP_PEER        0x2
 361 #define CHAP_WITHPEER   0x4
 362 #define CHAP_PEER       0x8
 363 #define EAP_WITHPEER    0x10
 364 #define EAP_PEER        0x20
 365
 366 /* Values for auth_done only */
 367 #define CHAP_MD5_WITHPEER       0x40
 368 #define CHAP_MD5_PEER           0x80
 369 #define CHAP_MS_SHIFT           8       /* LSB position for MS auths */
 370 #define CHAP_MS_WITHPEER        0x100
 371 #define CHAP_MS_PEER            0x200
 372 #define CHAP_MS2_WITHPEER       0x400
 373 #define CHAP_MS2_PEER           0x800
 374
 375 extern char *current_option;    /* the name of the option being parsed */
 376 extern int  privileged_option;  /* set iff the current option came from root */
 377 extern char *option_source;     /* string saying where the option came from */
 378 extern int  option_priority;    /* priority of current options */
 379
 380 /*
 381  * Values for phase.
 382  */
 383 #define PHASE_DEAD              0
 384 #define PHASE_INITIALIZE        1
 385 #define PHASE_SERIALCONN        2
 386 #define PHASE_DORMANT           3
 387 #define PHASE_ESTABLISH         4
 388 #define PHASE_AUTHENTICATE      5
 389 #define PHASE_CALLBACK          6
 390 #define PHASE_NETWORK           7
 391 #define PHASE_RUNNING           8
 392 #define PHASE_TERMINATE         9
 393 #define PHASE_DISCONNECT        10
 394 #define PHASE_HOLDOFF           11
 395 #define PHASE_MASTER            12
 396
 397 /*
 398  * The following struct gives the addresses of procedures to call
 399  * for a particular protocol.
 400  */
 401 struct protent {
 402     u_short protocol;           /* PPP protocol number */
 403     /* Initialization procedure */
 404     void (*init) __P((int unit));
 405     /* Process a received packet */
 406     void (*input) __P((int unit, u_char *pkt, int len));
 407     /* Process a received protocol-reject */
 408     void (*protrej) __P((int unit));
 409     /* Lower layer has come up */
 410     void (*lowerup) __P((int unit));
 411     /* Lower layer has gone down */
 412     void (*lowerdown) __P((int unit));
 413     /* Open the protocol */
 414     void (*open) __P((int unit));
 415     /* Close the protocol */
 416     void (*close) __P((int unit, char *reason));
 417     /* Print a packet in readable form */
 418     int  (*printpkt) __P((u_char *pkt, int len,
 419                           void (*printer) __P((void *, char *, ...)),
 420                           void *arg));
 421     /* Process a received data packet */
 422     void (*datainput) __P((int unit, u_char *pkt, int len));
 423     bool enabled_flag;          /* 0 iff protocol is disabled */
 424     char *name;                 /* Text name of protocol */
 425     char *data_name;            /* Text name of corresponding data protocol */
 426     option_t *options;          /* List of command-line options */
 427     /* Check requested options, assign defaults */
 428     void (*check_options) __P((void));
 429     /* Configure interface for demand-dial */
 430     int  (*demand_conf) __P((int unit));
 431     /* Say whether to bring up link for this pkt */
 432     int  (*active_pkt) __P((u_char *pkt, int len));
 433 };
 434
 435 /* Table of pointers to supported protocols */
 436 extern struct protent *protocols[];
 437
 438 /*
 439  * This struct contains pointers to a set of procedures for
 440  * doing operations on a "channel".  A channel provides a way
 441  * to send and receive PPP packets - the canonical example is
 442  * a serial port device in PPP line discipline (or equivalently
 443  * with PPP STREAMS modules pushed onto it).
 444  */
 445 struct channel {
 446         /* set of options for this channel */
 447         option_t *options;
 448         /* find and process a per-channel options file */
 449         void (*process_extra_options) __P((void));
 450         /* check all the options that have been given */
 451         void (*check_options) __P((void));
 452         /* get the channel ready to do PPP, return a file descriptor */
 453         int  (*connect) __P((void));
 454         /* we're finished with the channel */
 455         void (*disconnect) __P((void));
 456         /* put the channel into PPP `mode' */
 457         int  (*establish_ppp) __P((int));
 458         /* take the channel out of PPP `mode', restore loopback if demand */
 459         void (*disestablish_ppp) __P((int));
 460         /* set the transmit-side PPP parameters of the channel */
 461         void (*send_config) __P((int, u_int32_t, int, int));
 462         /* set the receive-side PPP parameters of the channel */
 463         void (*recv_config) __P((int, u_int32_t, int, int));
 464         /* cleanup on error or normal exit */
 465         void (*cleanup) __P((void));
 466         /* close the device, called in children after fork */
 467         void (*close) __P((void));
 468 };
 469
 470 extern struct channel *the_channel;
 471
 472 /*
 473  * Prototypes.
 474  */
 475
 476 /* Procedures exported from main.c. */
 477 void set_ifunit __P((int));     /* set stuff that depends on ifunit */
 478 void detach __P((void));        /* Detach from controlling tty */
 479 void die __P((int));            /* Cleanup and exit */
 480 void quit __P((void));          /* like die(1) */
 481 void novm __P((char *));        /* Say we ran out of memory, and die */
 482 void timeout __P((void (*func)(void *), void *arg, int s, int us));
 483                                 /* Call func(arg) after s.us seconds */
 484 void untimeout __P((void (*func)(void *), void *arg));
 485                                 /* Cancel call to func(arg) */
 486 void record_child __P((int, char *, void (*) (void *), void *, int));
 487 pid_t safe_fork __P((int, int, int));   /* Fork & close stuff in child */
 488 int  device_script __P((char *cmd, int in, int out, int dont_wait));
 489                                 /* Run `cmd' with given stdin and stdout */
 490 pid_t run_program __P((char *prog, char **args, int must_exist,
 491                        void (*done)(void *), void *arg, int wait));
 492                                 /* Run program prog with args in child */
 493 void reopen_log __P((void));    /* (re)open the connection to syslog */
 494 void print_link_stats __P((void)); /* Print stats, if available */
 495 void reset_link_stats __P((int)); /* Reset (init) stats when link goes up */
 496 void update_link_stats __P((int)); /* Get stats at link termination */
 497 void script_setenv __P((char *, char *, int));  /* set script env var */
 498 void script_unsetenv __P((char *));             /* unset script env var */
 499 void new_phase __P((int));      /* signal start of new phase */
 500 void add_notifier __P((struct notifier **, notify_func, void *));
 501 void remove_notifier __P((struct notifier **, notify_func, void *));
 502 void notify __P((struct notifier *, int));
 503 int  ppp_send_config __P((int, int, u_int32_t, int, int));
 504 int  ppp_recv_config __P((int, int, u_int32_t, int, int));
 505 const char *protocol_name __P((int));
 506 void remove_pidfiles __P((void));
 507 void lock_db __P((void));
 508 void unlock_db __P((void));
 509
 510 /* Procedures exported from tty.c. */
 511 void tty_init __P((void));
 512
 513 /* Procedures exported from utils.c. */
 514 void log_packet __P((u_char *, int, char *, int));
 515                                 /* Format a packet and log it with syslog */
 516 void print_string __P((char *, int,  void (*) (void *, char *, ...),
 517                 void *));       /* Format a string for output */
 518 int slprintf __P((char *, int, char *, ...));           /* sprintf++ */
 519 int vslprintf __P((char *, int, char *, va_list));      /* vsprintf++ */
 520 size_t strlcpy __P((char *, const char *, size_t));     /* safe strcpy */
 521 size_t strlcat __P((char *, const char *, size_t));     /* safe strncpy */
 522 void dbglog __P((char *, ...)); /* log a debug message */
 523 void info __P((char *, ...));   /* log an informational message */
 524 void notice __P((char *, ...)); /* log a notice-level message */
 525 void warn __P((char *, ...));   /* log a warning message */
 526 void error __P((char *, ...));  /* log an error message */
 527 void fatal __P((char *, ...));  /* log an error message and die(1) */
 528 void init_pr_log __P((const char *, int)); /* initialize for using pr_log */
 529 void pr_log __P((void *, char *, ...)); /* printer fn, output to syslog */
 530 void end_pr_log __P((void));    /* finish up after using pr_log */
 531 void dump_packet __P((const char *, u_char *, int));
 532                                 /* dump packet to debug log if interesting */
 533 ssize_t complete_read __P((int, void *, size_t));
 534                                 /* read a complete buffer */
 535
 536 /* Procedures exported from auth.c */
 537 void link_required __P((int));    /* we are starting to use the link */
 538 void start_link __P((int));       /* bring the link up now */
 539 void link_terminated __P((int));  /* we are finished with the link */
 540 void link_down __P((int));        /* the LCP layer has left the Opened state */
 541 void upper_layers_down __P((int));/* take all NCPs down */
 542 void link_established __P((int)); /* the link is up; authenticate now */
 543 void start_networks __P((int));   /* start all the network control protos */
 544 void continue_networks __P((int)); /* start network [ip, etc] control protos */
 545 void np_up __P((int, int));       /* a network protocol has come up */
 546 void np_down __P((int, int));     /* a network protocol has gone down */
 547 void np_finished __P((int, int)); /* a network protocol no longer needs link */
 548 void auth_peer_fail __P((int, int));
 549                                 /* peer failed to authenticate itself */
 550 void auth_peer_success __P((int, int, int, char *, int));
 551                                 /* peer successfully authenticated itself */
 552 void auth_withpeer_fail __P((int, int));
 553                                 /* we failed to authenticate ourselves */
 554 void auth_withpeer_success __P((int, int, int));
 555                                 /* we successfully authenticated ourselves */
 556 void auth_check_options __P((void));
 557                                 /* check authentication options supplied */
 558 void auth_reset __P((int));     /* check what secrets we have */
 559 int  check_passwd __P((int, char *, int, char *, int, char **));
 560                                 /* Check peer-supplied username/password */
 561 int  get_secret __P((int, char *, char *, char *, int *, int));
 562                                 /* get "secret" for chap */
 563 int  get_srp_secret __P((int unit, char *client, char *server, char *secret,
 564     int am_server));
 565 int  auth_ip_addr __P((int, u_int32_t));
 566                                 /* check if IP address is authorized */
 567 int  auth_number __P((void));   /* check if remote number is authorized */
 568 int  bad_ip_adrs __P((u_int32_t));
 569                                 /* check if IP address is unreasonable */
 570
 571 /* Procedures exported from demand.c */
 572 void demand_conf __P((void));   /* config interface(s) for demand-dial */
 573 void demand_block __P((void));  /* set all NPs to queue up packets */
 574 void demand_unblock __P((void)); /* set all NPs to pass packets */
 575 void demand_discard __P((void)); /* set all NPs to discard packets */
 576 void demand_rexmit __P((int, u_int32_t)); /* retransmit saved frames for an NP*/
 577 int  loop_chars __P((unsigned char *, int)); /* process chars from loopback */
 578 int  loop_frame __P((unsigned char *, int)); /* should we bring link up? */
 579
 580 /* Procedures exported from multilink.c */
 581 #ifdef HAVE_MULTILINK
 582 void mp_check_options __P((void)); /* Check multilink-related options */
 583 int  mp_join_bundle __P((void));  /* join our link to an appropriate bundle */
 584 void mp_exit_bundle __P((void));  /* have disconnected our link from bundle */
 585 void mp_bundle_terminated __P((void));
 586 char *epdisc_to_str __P((struct epdisc *)); /* string from endpoint discrim. */
 587 int  str_to_epdisc __P((struct epdisc *, char *)); /* endpt disc. from str */
 588 #else
 589 #define mp_bundle_terminated()  /* nothing */
 590 #define mp_exit_bundle()        /* nothing */
 591 #define doing_multilink         0
 592 #define multilink_master        0
 593 #endif
 594
 595 /* Procedures exported from sys-*.c */
 596 void sys_init __P((void));      /* Do system-dependent initialization */
 597 void sys_cleanup __P((void));   /* Restore system state before exiting */
 598 int  sys_check_options __P((void)); /* Check options specified */
 599 void sys_close __P((void));     /* Clean up in a child before execing */
 600 int  ppp_available __P((void)); /* Test whether ppp kernel support exists */
 601 int  get_pty __P((int *, int *, char *, int));  /* Get pty master/slave */
 602 int  open_ppp_loopback __P((void)); /* Open loopback for demand-dialling */
 603 int  tty_establish_ppp __P((int));  /* Turn serial port into a ppp interface */
 604 void tty_disestablish_ppp __P((int)); /* Restore port to normal operation */
 605 void generic_disestablish_ppp __P((int dev_fd)); /* Restore device setting */
 606 int  generic_establish_ppp __P((int dev_fd)); /* Make a ppp interface */
 607 void make_new_bundle __P((int, int, int, int)); /* Create new bundle */
 608 int  bundle_attach __P((int));  /* Attach link to existing bundle */
 609 void cfg_bundle __P((int, int, int, int)); /* Configure existing bundle */
 610 void destroy_bundle __P((void)); /* Tell driver to destroy bundle */
 611 void clean_check __P((void));   /* Check if line was 8-bit clean */
 612 void set_up_tty __P((int, int)); /* Set up port's speed, parameters, etc. */
 613 void restore_tty __P((int));    /* Restore port's original parameters */
 614 void setdtr __P((int, int));    /* Raise or lower port's DTR line */
 615 void output __P((int, u_char *, int)); /* Output a PPP packet */
 616 void wait_input __P((struct timeval *));
 617                                 /* Wait for input, with timeout */
 618 void add_fd __P((int));         /* Add fd to set to wait for */
 619 void remove_fd __P((int));      /* Remove fd from set to wait for */
 620 int  read_packet __P((u_char *)); /* Read PPP packet */
 621 int  get_loop_output __P((void)); /* Read pkts from loopback */
 622 void tty_send_config __P((int, u_int32_t, int, int));
 623                                 /* Configure i/f transmit parameters */
 624 void tty_set_xaccm __P((ext_accm));
 625                                 /* Set extended transmit ACCM */
 626 void tty_recv_config __P((int, u_int32_t, int, int));
 627                                 /* Configure i/f receive parameters */
 628 int  ccp_test __P((int, u_char *, int, int));
 629                                 /* Test support for compression scheme */
 630 void ccp_flags_set __P((int, int, int));
 631                                 /* Set kernel CCP state */
 632 int  ccp_fatal_error __P((int)); /* Test for fatal decomp error in kernel */
 633 int  get_idle_time __P((int, struct ppp_idle *));
 634                                 /* Find out how long link has been idle */
 635 int  get_ppp_stats __P((int, struct pppd_stats *));
 636                                 /* Return link statistics */
 637 void netif_set_mtu __P((int, int)); /* Set PPP interface MTU */
 638 int  netif_get_mtu __P((int));      /* Get PPP interface MTU */
 639 int  sifvjcomp __P((int, int, int, int));
 640                                 /* Configure VJ TCP header compression */
 641 int  sifup __P((int));          /* Configure i/f up for one protocol */
 642 int  sifnpmode __P((int u, int proto, enum NPmode mode));
 643                                 /* Set mode for handling packets for proto */
 644 int  sifdown __P((int));        /* Configure i/f down for one protocol */
 645 int  sifaddr __P((int, u_int32_t, u_int32_t, u_int32_t));
 646                                 /* Configure IPv4 addresses for i/f */
 647 int  cifaddr __P((int, u_int32_t, u_int32_t));
 648                                 /* Reset i/f IP addresses */
 649 #ifdef INET6
 650 int  sif6addr __P((int, eui64_t, eui64_t));
 651                                 /* Configure IPv6 addresses for i/f */
 652 int  cif6addr __P((int, eui64_t, eui64_t));
 653                                 /* Remove an IPv6 address from i/f */
 654 #endif
 655 int  sifdefaultroute __P((int, u_int32_t, u_int32_t));
 656                                 /* Create default route through i/f */
 657 int  cifdefaultroute __P((int, u_int32_t, u_int32_t));
 658                                 /* Delete default route through i/f */
 659 int  sifproxyarp __P((int, u_int32_t));
 660                                 /* Add proxy ARP entry for peer */
 661 int  cifproxyarp __P((int, u_int32_t));
 662                                 /* Delete proxy ARP entry for peer */
 663 u_int32_t GetMask __P((u_int32_t)); /* Get appropriate netmask for address */
 664 int  lock __P((char *));        /* Create lock file for device */
 665 int  relock __P((int));         /* Rewrite lock file with new pid */
 666 void unlock __P((void));        /* Delete previously-created lock file */
 667 void logwtmp __P((const char *, const char *, const char *));
 668                                 /* Write entry to wtmp file */
 669 int  get_host_seed __P((void)); /* Get host-dependent random number seed */
 670 int  have_route_to __P((u_int32_t)); /* Check if route to addr exists */
 671 #ifdef PPP_FILTER
 672 int  set_filters __P((struct bpf_program *pass, struct bpf_program *active));
 673                                 /* Set filter programs in kernel */
 674 #endif
 675 #ifdef IPX_CHANGE
 676 int  sipxfaddr __P((int, unsigned long, unsigned char *));
 677 int  cipxfaddr __P((int));
 678 #endif
 679 int  get_if_hwaddr __P((u_char *addr, char *name));
 680 char *get_first_ethernet __P((void));
 681
 682 /* Procedures exported from options.c */
 683 int setipaddr __P((char *, char **, int)); /* Set local/remote ip addresses */
 684 int  parse_args __P((int argc, char **argv));
 685                                 /* Parse options from arguments given */
 686 int  options_from_file __P((char *filename, int must_exist, int check_prot,
 687                             int privileged));
 688                                 /* Parse options from an options file */
 689 int  options_from_user __P((void)); /* Parse options from user's .ppprc */
 690 int  options_for_tty __P((void)); /* Parse options from /etc/ppp/options.tty */
 691 int  options_from_list __P((struct wordlist *, int privileged));
 692                                 /* Parse options from a wordlist */
 693 int  getword __P((FILE *f, char *word, int *newlinep, char *filename));
 694                                 /* Read a word from a file */
 695 void option_error __P((char *fmt, ...));
 696                                 /* Print an error message about an option */
 697 int int_option __P((char *, int *));
 698                                 /* Simplified number_option for decimal ints */
 699 void add_options __P((option_t *)); /* Add extra options */
 700 void check_options __P((void)); /* check values after all options parsed */
 701 int  override_value __P((const char *, int, const char *));
 702                                 /* override value if permitted by priority */
 703 void print_options __P((void (*) __P((void *, char *, ...)), void *));
 704                                 /* print out values of all options */
 705
 706 int parse_dotted_ip __P((char *, u_int32_t *));
 707
 708 /*
 709  * Hooks to enable plugins to change various things.
 710  */
 711 extern int (*new_phase_hook) __P((int));
 712 extern int (*idle_time_hook) __P((struct ppp_idle *));
 713 extern int (*holdoff_hook) __P((void));
 714 extern int (*pap_check_hook) __P((void));
 715 extern int (*pap_auth_hook) __P((char *user, char *passwd, char **msgp,
 716                                  struct wordlist **paddrs,
 717                                  struct wordlist **popts));
 718 extern void (*pap_logout_hook) __P((void));
 719 extern int (*pap_passwd_hook) __P((char *user, char *passwd));
 720 extern int (*allowed_address_hook) __P((u_int32_t addr));
 721 extern void (*ip_up_hook) __P((void));
 722 extern void (*ip_down_hook) __P((void));
 723 extern void (*ip_choose_hook) __P((u_int32_t *));
 724
 725 extern int (*chap_check_hook) __P((void));
 726 extern int (*chap_passwd_hook) __P((char *user, char *passwd));
 727 extern void (*multilink_join_hook) __P((void));
 728
 729 /* Let a plugin snoop sent and received packets.  Useful for L2TP */
 730 extern void (*snoop_recv_hook) __P((unsigned char *p, int len));
 731 extern void (*snoop_send_hook) __P((unsigned char *p, int len));
 732
 733 /*
 734  * Inline versions of get/put char/short/long.
 735  * Pointer is advanced; we assume that both arguments
 736  * are lvalues and will already be in registers.
 737  * cp MUST be u_char *.
 738  */
 739 #define GETCHAR(c, cp) { \
 740         (c) = *(cp)++; \
 741 }
 742 #define PUTCHAR(c, cp) { \
 743         *(cp)++ = (u_char) (c); \
 744 }
 745
 746
 747 #define GETSHORT(s, cp) { \
 748         (s) = *(cp)++ << 8; \
 749         (s) |= *(cp)++; \
 750 }
 751 #define PUTSHORT(s, cp) { \
 752         *(cp)++ = (u_char) ((s) >> 8); \
 753         *(cp)++ = (u_char) (s); \
 754 }
 755
 756 #define GETLONG(l, cp) { \
 757         (l) = *(cp)++ << 8; \
 758         (l) |= *(cp)++; (l) <<= 8; \
 759         (l) |= *(cp)++; (l) <<= 8; \
 760         (l) |= *(cp)++; \
 761 }
 762 #define PUTLONG(l, cp) { \
 763         *(cp)++ = (u_char) ((l) >> 24); \
 764         *(cp)++ = (u_char) ((l) >> 16); \
 765         *(cp)++ = (u_char) ((l) >> 8); \
 766         *(cp)++ = (u_char) (l); \
 767 }
 768
 769 #define INCPTR(n, cp)   ((cp) += (n))
 770 #define DECPTR(n, cp)   ((cp) -= (n))
 771
 772 /*
 773  * System dependent definitions for user-level 4.3BSD UNIX implementation.
 774  */
 775
 776 #define TIMEOUT(r, f, t)        timeout((r), (f), (t), 0)
 777 #define UNTIMEOUT(r, f)         untimeout((r), (f))
 778
 779 #define BCOPY(s, d, l)          memcpy(d, s, l)
 780 #define BZERO(s, n)             memset(s, 0, n)
 781 #define BCMP(s1, s2, l)         memcmp(s1, s2, l)
 782
 783 #define PRINTMSG(m, l)          { info("Remote message: %0.*v", l, m); }
 784
 785 /*
 786  * MAKEHEADER - Add Header fields to a packet.
 787  */
 788 #define MAKEHEADER(p, t) { \
 789     PUTCHAR(PPP_ALLSTATIONS, p); \
 790     PUTCHAR(PPP_UI, p); \
 791     PUTSHORT(t, p); }
 792
 793 /*
 794  * Exit status values.
 795  */
 796 #define EXIT_OK                 0
 797 #define EXIT_FATAL_ERROR        1
 798 #define EXIT_OPTION_ERROR       2
 799 #define EXIT_NOT_ROOT           3
 800 #define EXIT_NO_KERNEL_SUPPORT  4
 801 #define EXIT_USER_REQUEST       5
 802 #define EXIT_LOCK_FAILED        6
 803 #define EXIT_OPEN_FAILED        7
 804 #define EXIT_CONNECT_FAILED     8
 805 #define EXIT_PTYCMD_FAILED      9
 806 #define EXIT_NEGOTIATION_FAILED 10
 807 #define EXIT_PEER_AUTH_FAILED   11
 808 #define EXIT_IDLE_TIMEOUT       12
 809 #define EXIT_CONNECT_TIME       13
 810 #define EXIT_CALLBACK           14
 811 #define EXIT_PEER_DEAD          15
 812 #define EXIT_HANGUP             16
 813 #define EXIT_LOOPBACK           17
 814 #define EXIT_INIT_FAILED        18
 815 #define EXIT_AUTH_TOPEER_FAILED 19
 816 #ifdef MAXOCTETS
 817 #define EXIT_TRAFFIC_LIMIT      20
 818 #endif
 819 #define EXIT_CNID_AUTH_FAILED   21
 820
 821 /*
 822  * Debug macros.  Slightly useful for finding bugs in pppd, not particularly
 823  * useful for finding out why your connection isn't being established.
 824  */
 825 #ifdef DEBUGALL
 826 #define DEBUGMAIN       1
 827 #define DEBUGFSM        1
 828 #define DEBUGLCP        1
 829 #define DEBUGIPCP       1
 830 #define DEBUGIPV6CP     1
 831 #define DEBUGUPAP       1
 832 #define DEBUGCHAP       1
 833 #endif
 834
 835 #ifndef LOG_PPP                 /* we use LOG_LOCAL2 for syslog by default */
 836 #if defined(DEBUGMAIN) || defined(DEBUGFSM) || defined(DEBUGSYS) \
 837   || defined(DEBUGLCP) || defined(DEBUGIPCP) || defined(DEBUGUPAP) \
 838   || defined(DEBUGCHAP) || defined(DEBUG) || defined(DEBUGIPV6CP)
 839 #define LOG_PPP LOG_LOCAL2
 840 #else
 841 #define LOG_PPP LOG_DAEMON
 842 #endif
 843 #endif /* LOG_PPP */
 844
 845 #ifdef DEBUGMAIN
 846 #define MAINDEBUG(x)    if (debug) dbglog x
 847 #else
 848 #define MAINDEBUG(x)
 849 #endif
 850
 851 #ifdef DEBUGSYS
 852 #define SYSDEBUG(x)     if (debug) dbglog x
 853 #else
 854 #define SYSDEBUG(x)
 855 #endif
 856
 857 #ifdef DEBUGFSM
 858 #define FSMDEBUG(x)     if (debug) dbglog x
 859 #else
 860 #define FSMDEBUG(x)
 861 #endif
 862
 863 #ifdef DEBUGLCP
 864 #define LCPDEBUG(x)     if (debug) dbglog x
 865 #else
 866 #define LCPDEBUG(x)
 867 #endif
 868
 869 #ifdef DEBUGIPCP
 870 #define IPCPDEBUG(x)    if (debug) dbglog x
 871 #else
 872 #define IPCPDEBUG(x)
 873 #endif
 874
 875 #ifdef DEBUGIPV6CP
 876 #define IPV6CPDEBUG(x)  if (debug) dbglog x
 877 #else
 878 #define IPV6CPDEBUG(x)
 879 #endif
 880
 881 #ifdef DEBUGUPAP
 882 #define UPAPDEBUG(x)    if (debug) dbglog x
 883 #else
 884 #define UPAPDEBUG(x)
 885 #endif
 886
 887 #ifdef DEBUGCHAP
 888 #define CHAPDEBUG(x)    if (debug) dbglog x
 889 #else
 890 #define CHAPDEBUG(x)
 891 #endif
 892
 893 #ifdef DEBUGIPXCP
 894 #define IPXCPDEBUG(x)   if (debug) dbglog x
 895 #else
 896 #define IPXCPDEBUG(x)
 897 #endif
 898
 899 #ifndef SIGTYPE
 900 #if defined(sun) || defined(SYSV) || defined(POSIX_SOURCE)
 901 #define SIGTYPE void
 902 #else
 903 #define SIGTYPE int
 904 #endif /* defined(sun) || defined(SYSV) || defined(POSIX_SOURCE) */
 905 #endif /* SIGTYPE */
 906
 907 #ifndef MIN
 908 #define MIN(a, b)       ((a) < (b)? (a): (b))
 909 #endif
 910 #ifndef MAX
 911 #define MAX(a, b)       ((a) > (b)? (a): (b))
 912 #endif
 913
 914 #ifndef offsetof
 915 #define offsetof(type, member) ((size_t) &((type *)0)->member)
 916 #endif
 917
 918 #endif /* __PPP_H__ */