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pppd.h

/*
 * pppd.h - PPP daemon global declarations.
 *
 * Copyright (c) 1984-2000 Carnegie Mellon University. All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 *
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 *
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in
 *    the documentation and/or other materials provided with the
 *    distribution.
 *
 * 3. The name "Carnegie Mellon University" must not be used to
 *    endorse or promote products derived from this software without
 *    prior written permission. For permission or any legal
 *    details, please contact
 *      Office of Technology Transfer
 *      Carnegie Mellon University
 *      5000 Forbes Avenue
 *      Pittsburgh, PA  15213-3890
 *      (412) 268-4387, fax: (412) 268-7395
 *      tech-transfer@andrew.cmu.edu
 *
 * 4. Redistributions of any form whatsoever must retain the following
 *    acknowledgment:
 *    "This product includes software developed by Computing Services
 *     at Carnegie Mellon University (http://www.cmu.edu/computing/)."
 *
 * CARNEGIE MELLON UNIVERSITY DISCLAIMS ALL WARRANTIES WITH REGARD TO
 * THIS SOFTWARE, INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY
 * AND FITNESS, IN NO EVENT SHALL CARNEGIE MELLON UNIVERSITY BE LIABLE
 * FOR ANY SPECIAL, INDIRECT OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
 * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN
 * AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING
 * OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
 *
 * $Id: pppd.h,v 1.88 2004/11/13 12:02:22 paulus Exp $
 */

/*
 * TODO:
 */

#ifndef __PPPD_H__
#define __PPPD_H__

#include <stdio.h>            /* for FILE */
#include <limits.h>           /* for NGROUPS_MAX */
#include <sys/param.h>        /* for MAXPATHLEN and BSD4_4, if defined */
#include <sys/types.h>        /* for u_int32_t, if defined */
#include <sys/time.h>         /* for struct timeval */
#include <net/ppp_defs.h>
#include "patchlevel.h"

#if defined(__STDC__)
#include <stdarg.h>
#define __V(x)    x
#else
#include <varargs.h>
#define __V(x)    (va_alist) va_dcl
#define const
#define volatile
#endif

#ifdef INET6
#include "eui64.h"
#endif

/*
 * Limits.
 */

#define NUM_PPP         1     /* One PPP interface supported (per process) */
#define MAXWORDLEN      1024  /* max length of word in file (incl null) */
#define MAXARGS         1     /* max # args to a command */
#define MAXNAMELEN      256   /* max length of hostname or name for auth */
#define MAXSECRETLEN    256   /* max length of password or secret */

/*
 * Option descriptor structure.
 */

typedef unsigned char   bool;

enum opt_type {
      o_special_noarg = 0,
      o_special = 1,
      o_bool,
      o_int,
      o_uint32,
      o_string,
      o_wild
};

typedef struct {
      char  *name;            /* name of the option */
      enum opt_type type;
      void  *addr;
      char  *description;
      unsigned int flags;
      void  *addr2;
      int   upper_limit;
      int   lower_limit;
      const char *source;
      short int priority;
      short int winner;
} option_t;

/* Values for flags */
#define OPT_VALUE 0xff  /* mask for presupplied value */
#define OPT_HEX         0x100 /* int option is in hex */
#define OPT_NOARG 0x200 /* option doesn't take argument */
#define OPT_OR          0x400 /* OR in argument to value */
#define OPT_INC         0x800 /* increment value */
#define OPT_A2OR  0x800 /* for o_bool, OR arg to *(u_char *)addr2 */
#define OPT_PRIV  0x1000      /* privileged option */
#define OPT_STATIC      0x2000      /* string option goes into static array */
#define OPT_LLIMIT      0x4000      /* check value against lower limit */
#define OPT_ULIMIT      0x8000      /* check value against upper limit */
#define OPT_LIMITS      (OPT_LLIMIT|OPT_ULIMIT)
#define OPT_ZEROOK      0x10000     /* 0 value is OK even if not within limits */
#define OPT_HIDE  0x10000     /* for o_string, print value as ?????? */
#define OPT_A2LIST      0x10000 /* for o_special, keep list of values */
#define OPT_A2CLRB      0x10000 /* o_bool, clr val bits in *(u_char *)addr2 */
#define OPT_NOINCR      0x20000     /* value mustn't be increased */
#define OPT_ZEROINF     0x40000     /* with OPT_NOINCR, 0 == infinity */
#define OPT_PRIO  0x80000     /* process option priorities for this option */
#define OPT_PRIOSUB     0x100000 /* subsidiary member of priority group */
#define OPT_ALIAS 0x200000 /* option is alias for previous option */
#define OPT_A2COPY      0x400000 /* addr2 -> second location to rcv value */
#define OPT_ENABLE      0x800000 /* use *addr2 as enable for option */
#define OPT_A2CLR 0x1000000 /* clear *(bool *)addr2 */
#define OPT_PRIVFIX     0x2000000 /* user can't override if set by root */
#define OPT_INITONLY    0x4000000 /* option can only be set in init phase */
#define OPT_DEVEQUIV    0x8000000 /* equiv to device name */
#define OPT_DEVNAM      (OPT_INITONLY | OPT_DEVEQUIV)
#define OPT_A2PRINTER   0x10000000 /* *addr2 is a fn for printing option */
#define OPT_A2STRVAL    0x20000000 /* *addr2 points to current string value */
#define OPT_NOPRINT     0x40000000 /* don't print this option at all */

#define OPT_VAL(x)      ((x) & OPT_VALUE)

/* Values for priority */
#define OPRIO_DEFAULT   0     /* a default value */
#define OPRIO_CFGFILE   1     /* value from a configuration file */
#define OPRIO_CMDLINE   2     /* value from the command line */
#define OPRIO_SECFILE   3     /* value from options in a secrets file */
#define OPRIO_ROOT      100   /* added to priority if OPT_PRIVFIX && root */

#ifndef GIDSET_TYPE
#define GIDSET_TYPE     gid_t
#endif

/* Structure representing a list of permitted IP addresses. */
struct permitted_ip {
    int           permit;           /* 1 = permit, 0 = forbid */
    u_int32_t     base;       /* match if (addr & mask) == base */
    u_int32_t     mask;       /* base and mask are in network byte order */
};

/*
 * Unfortunately, the linux kernel driver uses a different structure
 * for statistics from the rest of the ports.
 * This structure serves as a common representation for the bits
 * pppd needs.
 */
struct pppd_stats {
    unsigned int  bytes_in;
    unsigned int  bytes_out;
    unsigned int  pkts_in;
    unsigned int  pkts_out;
};

/* Used for storing a sequence of words.  Usually malloced. */
struct wordlist {
    struct wordlist     *next;
    char          *word;
};

/* An endpoint discriminator, used with multilink. */
#define MAX_ENDP_LEN    20    /* maximum length of discriminator value */
struct epdisc {
    unsigned char class;
    unsigned char length;
    unsigned char value[MAX_ENDP_LEN];
};

/* values for epdisc.class */
#define EPD_NULL  0     /* null discriminator, no data */
#define EPD_LOCAL 1
#define EPD_IP          2
#define EPD_MAC         3
#define EPD_MAGIC 4
#define EPD_PHONENUM    5

typedef void (*notify_func) __P((void *, int));

struct notifier {
    struct notifier *next;
    notify_func       func;
    void        *arg;
};

/*
 * Global variables.
 */

extern int  hungup;           /* Physical layer has disconnected */
extern int  ifunit;           /* Interface unit number */
extern char ifname[];   /* Interface name */
extern char hostname[]; /* Our hostname */
extern u_char     outpacket_buf[]; /* Buffer for outgoing packets */
extern int  devfd;            /* fd of underlying device */
extern int  fd_ppp;           /* fd for talking PPP */
extern int  phase;            /* Current state of link - see values below */
extern int  baud_rate;  /* Current link speed in bits/sec */
extern char *progname;  /* Name of this program */
extern int  redirect_stderr;/* Connector's stderr should go to file */
extern char peer_authname[];/* Authenticated name of peer */
extern int  auth_done[NUM_PPP]; /* Methods actually used for auth */
extern int  privileged; /* We were run by real-uid root */
extern int  need_holdoff;     /* Need holdoff period after link terminates */
extern char **script_env;     /* Environment variables for scripts */
extern int  detached;   /* Have detached from controlling tty */
extern GIDSET_TYPE groups[NGROUPS_MAX];   /* groups the user is in */
extern int  ngroups;    /* How many groups valid in groups */
extern struct pppd_stats link_stats; /* byte/packet counts etc. for link */
extern int  link_stats_valid; /* set if link_stats is valid */
extern unsigned   link_connect_time; /* time the link was up for */
extern int  using_pty;  /* using pty as device (notty or pty opt.) */
extern int  log_to_fd;  /* logging to this fd as well as syslog */
extern bool log_default;      /* log_to_fd is default (stdout) */
extern char *no_ppp_msg;      /* message to print if ppp not in kernel */
extern volatile int status;   /* exit status for pppd */
extern bool devnam_fixed;     /* can no longer change devnam */
extern int  unsuccess;  /* # unsuccessful connection attempts */
extern int  do_callback;      /* set if we want to do callback next */
extern int  doing_callback;   /* set if this is a callback */
extern int  error_count;      /* # of times error() has been called */
extern char ppp_devnam[MAXPATHLEN];
extern char     remote_number[MAXNAMELEN]; /* Remote telephone number, if avail. */
extern int      ppp_session_number; /* Session number (eg PPPoE session) */
extern int  fd_devnull; /* fd open to /dev/null */

extern int  listen_time;      /* time to listen first (ms) */
extern bool doing_multilink;
extern bool multilink_master;
extern bool bundle_eof;
extern bool bundle_terminating;

extern struct notifier *pidchange;   /* for notifications of pid changing */
extern struct notifier *phasechange; /* for notifications of phase changes */
extern struct notifier *exitnotify;  /* for notification that we're exiting */
extern struct notifier *sigreceived; /* notification of received signal */
extern struct notifier *ip_up_notifier; /* IPCP has come up */
extern struct notifier *ip_down_notifier; /* IPCP has gone down */
extern struct notifier *auth_up_notifier; /* peer has authenticated */
extern struct notifier *link_down_notifier; /* link has gone down */
extern struct notifier *fork_notifier;    /* we are a new child process */

/* Values for do_callback and doing_callback */
#define CALLBACK_DIALIN       1     /* we are expecting the call back */
#define CALLBACK_DIALOUT      2     /* we are dialling out to call back */

/*
 * Variables set by command-line options.
 */

extern int  debug;            /* Debug flag */
extern int  kdebugflag; /* Tell kernel to print debug messages */
extern int  default_device;   /* Using /dev/tty or equivalent */
extern char devnam[MAXPATHLEN];     /* Device name */
extern int  crtscts;    /* Use hardware flow control */
extern bool modem;            /* Use modem control lines */
extern int  inspeed;    /* Input/Output speed requested */
extern u_int32_t netmask;     /* IP netmask to set on interface */
extern bool lockflag;   /* Create lock file to lock the serial dev */
extern bool nodetach;   /* Don't detach from controlling tty */
extern bool updetach;   /* Detach from controlling tty when link up */
extern char *initializer;     /* Script to initialize physical link */
extern char *connect_script; /* Script to establish physical link */
extern char *disconnect_script; /* Script to disestablish physical link */
extern char *welcomer;  /* Script to welcome client after connection */
extern char *ptycommand;      /* Command to run on other side of pty */
extern int  maxconnect; /* Maximum connect time (seconds) */
extern char user[MAXNAMELEN];/* Our name for authenticating ourselves */
extern char passwd[MAXSECRETLEN];   /* Password for PAP or CHAP */
extern bool auth_required;    /* Peer is required to authenticate */
extern bool persist;    /* Reopen link after it goes down */
extern bool uselogin;   /* Use /etc/passwd for checking PAP */
extern char our_name[MAXNAMELEN];/* Our name for authentication purposes */
extern char remote_name[MAXNAMELEN]; /* Peer's name for authentication */
extern bool explicit_remote;/* remote_name specified with remotename opt */
extern bool demand;           /* Do dial-on-demand */
extern char *ipparam;   /* Extra parameter for ip up/down scripts */
extern bool cryptpap;   /* Others' PAP passwords are encrypted */
extern int  idle_time_limit;/* Shut down link if idle for this long */
extern int  holdoff;    /* Dead time before restarting */
extern bool holdoff_specified; /* true if user gave a holdoff value */
extern bool notty;            /* Stdin/out is not a tty */
extern char *pty_socket;      /* Socket to connect to pty */
extern char *record_file;     /* File to record chars sent/received */
extern bool sync_serial;      /* Device is synchronous serial device */
extern int  maxfail;    /* Max # of unsuccessful connection attempts */
extern char linkname[MAXPATHLEN]; /* logical name for link */
extern bool tune_kernel;      /* May alter kernel settings as necessary */
extern int  connect_delay;    /* Time to delay after connect script */
extern int  max_data_rate;    /* max bytes/sec through charshunt */
extern int  req_unit;   /* interface unit number to use */
extern bool multilink;  /* enable multilink operation */
extern bool noendpoint; /* don't send or accept endpt. discrim. */
extern char *bundle_name;     /* bundle name for multilink */
extern bool dump_options;     /* print out option values */
extern bool dryrun;           /* check everything, print options, exit */
extern int  child_wait; /* # seconds to wait for children at end */

#ifdef MAXOCTETS
extern unsigned int maxoctets;           /* Maximum octetes per session (in bytes) */
extern int       maxoctets_dir;      /* Direction :
                              0 - in+out (default)
                              1 - in 
                              2 - out
                              3 - max(in,out) */
extern int       maxoctets_timeout;  /* Timeout for check of octets limit */
#define PPP_OCTETS_DIRECTION_SUM        0
#define PPP_OCTETS_DIRECTION_IN         1
#define PPP_OCTETS_DIRECTION_OUT        2
#define PPP_OCTETS_DIRECTION_MAXOVERAL  3
/* same as previos, but little different on RADIUS side */
#define PPP_OCTETS_DIRECTION_MAXSESSION 4 
#endif

#ifdef PPP_FILTER
extern struct     bpf_program pass_filter;   /* Filter for pkts to pass */
extern struct     bpf_program active_filter; /* Filter for link-active pkts */
#endif

#ifdef MSLANMAN
extern bool ms_lanman;  /* Use LanMan password instead of NT */
                        /* Has meaning only with MS-CHAP challenges */
#endif

/* Values for auth_pending, auth_done */
#define PAP_WITHPEER    0x1
#define PAP_PEER  0x2
#define CHAP_WITHPEER   0x4
#define CHAP_PEER 0x8
#define EAP_WITHPEER    0x10
#define EAP_PEER  0x20

/* Values for auth_done only */
#define CHAP_MD5_WITHPEER     0x40
#define CHAP_MD5_PEER         0x80
#define CHAP_MS_SHIFT         8     /* LSB position for MS auths */
#define CHAP_MS_WITHPEER      0x100
#define CHAP_MS_PEER          0x200
#define CHAP_MS2_WITHPEER     0x400
#define CHAP_MS2_PEER         0x800

extern char *current_option;  /* the name of the option being parsed */
extern int  privileged_option;      /* set iff the current option came from root */
extern char *option_source;   /* string saying where the option came from */
extern int  option_priority;  /* priority of current options */

/*
 * Values for phase.
 */
#define PHASE_DEAD            0
#define PHASE_INITIALIZE      1
#define PHASE_SERIALCONN      2
#define PHASE_DORMANT         3
#define PHASE_ESTABLISH       4
#define PHASE_AUTHENTICATE    5
#define PHASE_CALLBACK        6
#define PHASE_NETWORK         7
#define PHASE_RUNNING         8
#define PHASE_TERMINATE       9
#define PHASE_DISCONNECT      10
#define PHASE_HOLDOFF         11
#define PHASE_MASTER          12

/*
 * The following struct gives the addresses of procedures to call
 * for a particular protocol.
 */
struct protent {
    u_short protocol;         /* PPP protocol number */
    /* Initialization procedure */
    void (*init) __P((int unit));
    /* Process a received packet */
    void (*input) __P((int unit, u_char *pkt, int len));
    /* Process a received protocol-reject */
    void (*protrej) __P((int unit));
    /* Lower layer has come up */
    void (*lowerup) __P((int unit));
    /* Lower layer has gone down */
    void (*lowerdown) __P((int unit));
    /* Open the protocol */
    void (*open) __P((int unit));
    /* Close the protocol */
    void (*close) __P((int unit, char *reason));
    /* Print a packet in readable form */
    int  (*printpkt) __P((u_char *pkt, int len,
                    void (*printer) __P((void *, char *, ...)),
                    void *arg));
    /* Process a received data packet */
    void (*datainput) __P((int unit, u_char *pkt, int len));
    bool enabled_flag;        /* 0 iff protocol is disabled */
    char *name;               /* Text name of protocol */
    char *data_name;          /* Text name of corresponding data protocol */
    option_t *options;        /* List of command-line options */
    /* Check requested options, assign defaults */
    void (*check_options) __P((void));
    /* Configure interface for demand-dial */
    int  (*demand_conf) __P((int unit));
    /* Say whether to bring up link for this pkt */
    int  (*active_pkt) __P((u_char *pkt, int len));
};

/* Table of pointers to supported protocols */
extern struct protent *protocols[];

/*
 * This struct contains pointers to a set of procedures for
 * doing operations on a "channel".  A channel provides a way
 * to send and receive PPP packets - the canonical example is
 * a serial port device in PPP line discipline (or equivalently
 * with PPP STREAMS modules pushed onto it).
 */
struct channel {
      /* set of options for this channel */
      option_t *options;
      /* find and process a per-channel options file */
      void (*process_extra_options) __P((void));
      /* check all the options that have been given */
      void (*check_options) __P((void));
      /* get the channel ready to do PPP, return a file descriptor */
      int  (*connect) __P((void));
      /* we're finished with the channel */
      void (*disconnect) __P((void));
      /* put the channel into PPP `mode' */
      int  (*establish_ppp) __P((int));
      /* take the channel out of PPP `mode', restore loopback if demand */
      void (*disestablish_ppp) __P((int));
      /* set the transmit-side PPP parameters of the channel */
      void (*send_config) __P((int, u_int32_t, int, int));
      /* set the receive-side PPP parameters of the channel */
      void (*recv_config) __P((int, u_int32_t, int, int));
      /* cleanup on error or normal exit */
      void (*cleanup) __P((void));
      /* close the device, called in children after fork */
      void (*close) __P((void));
};

extern struct channel *the_channel;

/*
 * Prototypes.
 */

/* Procedures exported from main.c. */
void set_ifunit __P((int));   /* set stuff that depends on ifunit */
void detach __P((void));      /* Detach from controlling tty */
void die __P((int));          /* Cleanup and exit */
void quit __P((void));        /* like die(1) */
void novm __P((char *));      /* Say we ran out of memory, and die */
void timeout __P((void (*func)(void *), void *arg, int s, int us));
                        /* Call func(arg) after s.us seconds */
void untimeout __P((void (*func)(void *), void *arg));
                        /* Cancel call to func(arg) */
void record_child __P((int, char *, void (*) (void *), void *));
pid_t safe_fork __P((int, int, int));     /* Fork & close stuff in child */
int  device_script __P((char *cmd, int in, int out, int dont_wait));
                        /* Run `cmd' with given stdin and stdout */
pid_t run_program __P((char *prog, char **args, int must_exist,
                   void (*done)(void *), void *arg));
                        /* Run program prog with args in child */
void reopen_log __P((void));  /* (re)open the connection to syslog */
void print_link_stats __P((void)); /* Print stats, if available */
void reset_link_stats __P((int)); /* Reset (init) stats when link goes up */
void update_link_stats __P((int)); /* Get stats at link termination */
void script_setenv __P((char *, char *, int));  /* set script env var */
void script_unsetenv __P((char *));       /* unset script env var */
void new_phase __P((int));    /* signal start of new phase */
void add_notifier __P((struct notifier **, notify_func, void *));
void remove_notifier __P((struct notifier **, notify_func, void *));
void notify __P((struct notifier *, int));
int  ppp_send_config __P((int, int, u_int32_t, int, int));
int  ppp_recv_config __P((int, int, u_int32_t, int, int));
void remove_pidfiles __P((void));
void lock_db __P((void));
void unlock_db __P((void));

/* Procedures exported from tty.c. */
void tty_init __P((void));

/* Procedures exported from utils.c. */
void log_packet __P((u_char *, int, char *, int));
                        /* Format a packet and log it with syslog */
void print_string __P((char *, int,  void (*) (void *, char *, ...),
            void *));   /* Format a string for output */
int slprintf __P((char *, int, char *, ...));         /* sprintf++ */
int vslprintf __P((char *, int, char *, va_list));    /* vsprintf++ */
size_t strlcpy __P((char *, const char *, size_t));   /* safe strcpy */
size_t strlcat __P((char *, const char *, size_t));   /* safe strncpy */
void dbglog __P((char *, ...));     /* log a debug message */
void info __P((char *, ...)); /* log an informational message */
void notice __P((char *, ...));     /* log a notice-level message */
void warn __P((char *, ...)); /* log a warning message */
void error __P((char *, ...));      /* log an error message */
void fatal __P((char *, ...));      /* log an error message and die(1) */
void init_pr_log __P((char *, int));      /* initialize for using pr_log */
void pr_log __P((void *, char *, ...));   /* printer fn, output to syslog */
void end_pr_log __P((void));  /* finish up after using pr_log */
void dump_packet __P((const char *, u_char *, int));
                        /* dump packet to debug log if interesting */
ssize_t complete_read __P((int, void *, size_t));
                        /* read a complete buffer */

/* Procedures exported from auth.c */
void link_required __P((int));        /* we are starting to use the link */
void link_terminated __P((int));  /* we are finished with the link */
void link_down __P((int));      /* the LCP layer has left the Opened state */
void upper_layers_down __P((int));/* take all NCPs down */
void link_established __P((int)); /* the link is up; authenticate now */
void start_networks __P((int));   /* start all the network control protos */
void continue_networks __P((int)); /* start network [ip, etc] control protos */
void np_up __P((int, int));     /* a network protocol has come up */
void np_down __P((int, int));   /* a network protocol has gone down */
void np_finished __P((int, int)); /* a network protocol no longer needs link */
void auth_peer_fail __P((int, int));
                        /* peer failed to authenticate itself */
void auth_peer_success __P((int, int, int, char *, int));
                        /* peer successfully authenticated itself */
void auth_withpeer_fail __P((int, int));
                        /* we failed to authenticate ourselves */
void auth_withpeer_success __P((int, int, int));
                        /* we successfully authenticated ourselves */
void auth_check_options __P((void));
                        /* check authentication options supplied */
void auth_reset __P((int));   /* check what secrets we have */
int  check_passwd __P((int, char *, int, char *, int, char **));
                        /* Check peer-supplied username/password */
int  get_secret __P((int, char *, char *, char *, int *, int));
                        /* get "secret" for chap */
int  get_srp_secret __P((int unit, char *client, char *server, char *secret,
    int am_server));
int  auth_ip_addr __P((int, u_int32_t));
                        /* check if IP address is authorized */
int  auth_number __P((void)); /* check if remote number is authorized */
int  bad_ip_adrs __P((u_int32_t));
                        /* check if IP address is unreasonable */

/* Procedures exported from demand.c */
void demand_conf __P((void)); /* config interface(s) for demand-dial */
void demand_block __P((void));      /* set all NPs to queue up packets */
void demand_unblock __P((void)); /* set all NPs to pass packets */
void demand_discard __P((void)); /* set all NPs to discard packets */
void demand_rexmit __P((int));      /* retransmit saved frames for an NP */
int  loop_chars __P((unsigned char *, int)); /* process chars from loopback */
int  loop_frame __P((unsigned char *, int)); /* should we bring link up? */

/* Procedures exported from multilink.c */
#ifdef HAVE_MULTILINK
void mp_check_options __P((void)); /* Check multilink-related options */
int  mp_join_bundle __P((void));  /* join our link to an appropriate bundle */
void mp_exit_bundle __P((void));  /* have disconnected our link from bundle */
void mp_bundle_terminated __P((void));
char *epdisc_to_str __P((struct epdisc *)); /* string from endpoint discrim. */
int  str_to_epdisc __P((struct epdisc *, char *)); /* endpt disc. from str */
#else
#define mp_bundle_terminated()      /* nothing */
#define mp_exit_bundle()      /* nothing */
#define doing_multilink       0
#define multilink_master      0
#endif

/* Procedures exported from sys-*.c */
void sys_init __P((void));    /* Do system-dependent initialization */
void sys_cleanup __P((void)); /* Restore system state before exiting */
int  sys_check_options __P((void)); /* Check options specified */
void sys_close __P((void));   /* Clean up in a child before execing */
int  ppp_available __P((void));     /* Test whether ppp kernel support exists */
int  get_pty __P((int *, int *, char *, int));  /* Get pty master/slave */
int  open_ppp_loopback __P((void)); /* Open loopback for demand-dialling */
int  tty_establish_ppp __P((int));  /* Turn serial port into a ppp interface */
void tty_disestablish_ppp __P((int)); /* Restore port to normal operation */
void generic_disestablish_ppp __P((int dev_fd)); /* Restore device setting */
int  generic_establish_ppp __P((int dev_fd)); /* Make a ppp interface */
void make_new_bundle __P((int, int, int, int)); /* Create new bundle */
int  bundle_attach __P((int));      /* Attach link to existing bundle */
void cfg_bundle __P((int, int, int, int)); /* Configure existing bundle */
void destroy_bundle __P((void)); /* Tell driver to destroy bundle */
void clean_check __P((void)); /* Check if line was 8-bit clean */
void set_up_tty __P((int, int)); /* Set up port's speed, parameters, etc. */
void restore_tty __P((int));  /* Restore port's original parameters */
void setdtr __P((int, int));  /* Raise or lower port's DTR line */
void output __P((int, u_char *, int)); /* Output a PPP packet */
void wait_input __P((struct timeval *));
                        /* Wait for input, with timeout */
void add_fd __P((int));       /* Add fd to set to wait for */
void remove_fd __P((int));    /* Remove fd from set to wait for */
int  read_packet __P((u_char *)); /* Read PPP packet */
int  get_loop_output __P((void)); /* Read pkts from loopback */
void tty_send_config __P((int, u_int32_t, int, int));
                        /* Configure i/f transmit parameters */
void tty_set_xaccm __P((ext_accm));
                        /* Set extended transmit ACCM */
void tty_recv_config __P((int, u_int32_t, int, int));
                        /* Configure i/f receive parameters */
int  ccp_test __P((int, u_char *, int, int));
                        /* Test support for compression scheme */
void ccp_flags_set __P((int, int, int));
                        /* Set kernel CCP state */
int  ccp_fatal_error __P((int)); /* Test for fatal decomp error in kernel */
int  get_idle_time __P((int, struct ppp_idle *));
                        /* Find out how long link has been idle */
int  get_ppp_stats __P((int, struct pppd_stats *));
                        /* Return link statistics */
void netif_set_mtu __P((int, int)); /* Set PPP interface MTU */
int  netif_get_mtu __P((int));      /* Get PPP interface MTU */
int  sifvjcomp __P((int, int, int, int));
                        /* Configure VJ TCP header compression */
int  sifup __P((int));        /* Configure i/f up for one protocol */
int  sifnpmode __P((int u, int proto, enum NPmode mode));
                        /* Set mode for handling packets for proto */
int  sifdown __P((int));      /* Configure i/f down for one protocol */
int  sifaddr __P((int, u_int32_t, u_int32_t, u_int32_t));
                        /* Configure IPv4 addresses for i/f */
int  cifaddr __P((int, u_int32_t, u_int32_t));
                        /* Reset i/f IP addresses */
#ifdef INET6
int  sif6addr __P((int, eui64_t, eui64_t));
                        /* Configure IPv6 addresses for i/f */
int  cif6addr __P((int, eui64_t, eui64_t));
                        /* Remove an IPv6 address from i/f */
#endif
int  sifdefaultroute __P((int, u_int32_t, u_int32_t));
                        /* Create default route through i/f */
int  cifdefaultroute __P((int, u_int32_t, u_int32_t));
                        /* Delete default route through i/f */
int  sifproxyarp __P((int, u_int32_t));
                        /* Add proxy ARP entry for peer */
int  cifproxyarp __P((int, u_int32_t));
                        /* Delete proxy ARP entry for peer */
u_int32_t GetMask __P((u_int32_t)); /* Get appropriate netmask for address */
int  lock __P((char *));      /* Create lock file for device */
int  relock __P((int));       /* Rewrite lock file with new pid */
void unlock __P((void));      /* Delete previously-created lock file */
void logwtmp __P((const char *, const char *, const char *));
                        /* Write entry to wtmp file */
int  get_host_seed __P((void));     /* Get host-dependent random number seed */
int  have_route_to __P((u_int32_t)); /* Check if route to addr exists */
#ifdef PPP_FILTER
int  set_filters __P((struct bpf_program *pass, struct bpf_program *active));
                        /* Set filter programs in kernel */
#endif
#ifdef IPX_CHANGE
int  sipxfaddr __P((int, unsigned long, unsigned char *));
int  cipxfaddr __P((int));
#endif
int  get_if_hwaddr __P((u_char *addr, char *name));
char *get_first_ethernet __P((void));

/* Procedures exported from options.c */
int setipaddr __P((char *, char **, int)); /* Set local/remote ip addresses */
int  parse_args __P((int argc, char **argv));
                        /* Parse options from arguments given */
int  options_from_file __P((char *filename, int must_exist, int check_prot,
                      int privileged));
                        /* Parse options from an options file */
int  options_from_user __P((void)); /* Parse options from user's .ppprc */
int  options_for_tty __P((void)); /* Parse options from /etc/ppp/options.tty */
int  options_from_list __P((struct wordlist *, int privileged));
                        /* Parse options from a wordlist */
int  getword __P((FILE *f, char *word, int *newlinep, char *filename));
                        /* Read a word from a file */
void option_error __P((char *fmt, ...));
                        /* Print an error message about an option */
int int_option __P((char *, int *));
                        /* Simplified number_option for decimal ints */
void add_options __P((option_t *)); /* Add extra options */
void check_options __P((void));     /* check values after all options parsed */
int  override_value __P((const char *, int, const char *));
                        /* override value if permitted by priority */
void print_options __P((void (*) __P((void *, char *, ...)), void *));
                        /* print out values of all options */

int parse_dotted_ip __P((char *, u_int32_t *));

/*
 * Hooks to enable plugins to change various things.
 */
extern int (*new_phase_hook) __P((int));
extern int (*idle_time_hook) __P((struct ppp_idle *));
extern int (*holdoff_hook) __P((void));
extern int (*pap_check_hook) __P((void));
extern int (*pap_auth_hook) __P((char *user, char *passwd, char **msgp,
                         struct wordlist **paddrs,
                         struct wordlist **popts));
extern void (*pap_logout_hook) __P((void));
extern int (*pap_passwd_hook) __P((char *user, char *passwd));
extern int (*allowed_address_hook) __P((u_int32_t addr));
extern void (*ip_up_hook) __P((void));
extern void (*ip_down_hook) __P((void));
extern void (*ip_choose_hook) __P((u_int32_t *));

extern int (*chap_check_hook) __P((void));
extern int (*chap_passwd_hook) __P((char *user, char *passwd));

/* Let a plugin snoop sent and received packets.  Useful for L2TP */
extern void (*snoop_recv_hook) __P((unsigned char *p, int len));
extern void (*snoop_send_hook) __P((unsigned char *p, int len));

/*
 * Inline versions of get/put char/short/long.
 * Pointer is advanced; we assume that both arguments
 * are lvalues and will already be in registers.
 * cp MUST be u_char *.
 */
#define GETCHAR(c, cp) { \
      (c) = *(cp)++; \
}
#define PUTCHAR(c, cp) { \
      *(cp)++ = (u_char) (c); \
}


#define GETSHORT(s, cp) { \
      (s) = *(cp)++ << 8; \
      (s) |= *(cp)++; \
}
#define PUTSHORT(s, cp) { \
      *(cp)++ = (u_char) ((s) >> 8); \
      *(cp)++ = (u_char) (s); \
}

#define GETLONG(l, cp) { \
      (l) = *(cp)++ << 8; \
      (l) |= *(cp)++; (l) <<= 8; \
      (l) |= *(cp)++; (l) <<= 8; \
      (l) |= *(cp)++; \
}
#define PUTLONG(l, cp) { \
      *(cp)++ = (u_char) ((l) >> 24); \
      *(cp)++ = (u_char) ((l) >> 16); \
      *(cp)++ = (u_char) ((l) >> 8); \
      *(cp)++ = (u_char) (l); \
}

#define INCPTR(n, cp)   ((cp) += (n))
#define DECPTR(n, cp)   ((cp) -= (n))

/*
 * System dependent definitions for user-level 4.3BSD UNIX implementation.
 */

#define TIMEOUT(r, f, t)      timeout((r), (f), (t), 0)
#define UNTIMEOUT(r, f)       untimeout((r), (f))

#define BCOPY(s, d, l)        memcpy(d, s, l)
#define BZERO(s, n)           memset(s, 0, n)
#define     BCMP(s1, s2, l)         memcmp(s1, s2, l)

#define PRINTMSG(m, l)        { info("Remote message: %0.*v", l, m); }

/*
 * MAKEHEADER - Add Header fields to a packet.
 */
#define MAKEHEADER(p, t) { \
    PUTCHAR(PPP_ALLSTATIONS, p); \
    PUTCHAR(PPP_UI, p); \
    PUTSHORT(t, p); }

/*
 * Exit status values.
 */
#define EXIT_OK               0
#define EXIT_FATAL_ERROR      1
#define EXIT_OPTION_ERROR     2
#define EXIT_NOT_ROOT         3
#define EXIT_NO_KERNEL_SUPPORT      4
#define EXIT_USER_REQUEST     5
#define EXIT_LOCK_FAILED      6
#define EXIT_OPEN_FAILED      7
#define EXIT_CONNECT_FAILED   8
#define EXIT_PTYCMD_FAILED    9
#define EXIT_NEGOTIATION_FAILED     10
#define EXIT_PEER_AUTH_FAILED 11
#define EXIT_IDLE_TIMEOUT     12
#define EXIT_CONNECT_TIME     13
#define EXIT_CALLBACK         14
#define EXIT_PEER_DEAD        15
#define EXIT_HANGUP           16
#define EXIT_LOOPBACK         17
#define EXIT_INIT_FAILED      18
#define EXIT_AUTH_TOPEER_FAILED     19
#ifdef MAXOCTETS
#define EXIT_TRAFFIC_LIMIT    20
#endif
#define EXIT_CNID_AUTH_FAILED 21

/*
 * Debug macros.  Slightly useful for finding bugs in pppd, not particularly
 * useful for finding out why your connection isn't being established.
 */
#ifdef DEBUGALL
#define DEBUGMAIN 1
#define DEBUGFSM  1
#define DEBUGLCP  1
#define DEBUGIPCP 1
#define DEBUGIPV6CP     1
#define DEBUGUPAP 1
#define DEBUGCHAP 1
#endif

#ifndef LOG_PPP               /* we use LOG_LOCAL2 for syslog by default */
#if defined(DEBUGMAIN) || defined(DEBUGFSM) || defined(DEBUGSYS) \
  || defined(DEBUGLCP) || defined(DEBUGIPCP) || defined(DEBUGUPAP) \
  || defined(DEBUGCHAP) || defined(DEBUG) || defined(DEBUGIPV6CP)
#define LOG_PPP LOG_LOCAL2
#else
#define LOG_PPP LOG_DAEMON
#endif
#endif /* LOG_PPP */

#ifdef DEBUGMAIN
#define MAINDEBUG(x)    if (debug) dbglog x
#else
#define MAINDEBUG(x)
#endif

#ifdef DEBUGSYS
#define SYSDEBUG(x)     if (debug) dbglog x
#else
#define SYSDEBUG(x)
#endif

#ifdef DEBUGFSM
#define FSMDEBUG(x)     if (debug) dbglog x
#else
#define FSMDEBUG(x)
#endif

#ifdef DEBUGLCP
#define LCPDEBUG(x)     if (debug) dbglog x
#else
#define LCPDEBUG(x)
#endif

#ifdef DEBUGIPCP
#define IPCPDEBUG(x)    if (debug) dbglog x
#else
#define IPCPDEBUG(x)
#endif

#ifdef DEBUGIPV6CP
#define IPV6CPDEBUG(x)  if (debug) dbglog x
#else
#define IPV6CPDEBUG(x)
#endif

#ifdef DEBUGUPAP
#define UPAPDEBUG(x)    if (debug) dbglog x
#else
#define UPAPDEBUG(x)
#endif

#ifdef DEBUGCHAP
#define CHAPDEBUG(x)    if (debug) dbglog x
#else
#define CHAPDEBUG(x)
#endif

#ifdef DEBUGIPXCP
#define IPXCPDEBUG(x)   if (debug) dbglog x
#else
#define IPXCPDEBUG(x)
#endif

#ifndef SIGTYPE
#if defined(sun) || defined(SYSV) || defined(POSIX_SOURCE)
#define SIGTYPE void
#else
#define SIGTYPE int
#endif /* defined(sun) || defined(SYSV) || defined(POSIX_SOURCE) */
#endif /* SIGTYPE */

#ifndef MIN
#define MIN(a, b) ((a) < (b)? (a): (b))
#endif
#ifndef MAX
#define MAX(a, b) ((a) > (b)? (a): (b))
#endif

#ifndef offsetof
#define offsetof(type, member) ((size_t) &((type *)0)->member)
#endif

#endif /* __PPP_H__ */

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