/*
 * Copyright (c) 1988, 1990, 1993
 *      The Regents of the University of California.  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. Neither the name of the University nor the names of its contributors
 *    may be used to endorse or promote products derived from this software
 *    without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
 * SUCH DAMAGE.
 *
 *      @(#)externs.h   8.3 (Berkeley) 5/30/95
 *      $FreeBSD$
 */

#ifndef BSD
# define BSD 43
#endif

/*
 * ucb stdio.h defines BSD as something weird
 */
#if defined(sun) && defined(__svr4__)
#define BSD 43
#endif

#ifndef USE_TERMIO
# if BSD > 43 || defined(SYSV_TERMIO)
#  define USE_TERMIO
# endif
#endif

#include <stdio.h>
#include <setjmp.h>
#include <sys/ioctl.h>
#include <errno.h>
#ifdef  USE_TERMIO
# ifndef        VINTR
#  include <termios.h>
# endif
# define termio termios
#endif
#if defined(NO_CC_T) || !defined(USE_TERMIO)
# if !defined(USE_TERMIO)
typedef char cc_t;
# else
typedef unsigned char cc_t;
# endif
#endif

#include <string.h>

#if defined(IPSEC)
#include <netipsec/ipsec.h>
#if defined(IPSEC_POLICY_IPSEC)
extern char *ipsec_policy_in;
extern char *ipsec_policy_out;
#endif
#endif

#ifndef _POSIX_VDISABLE
# ifdef sun
#  include <sys/param.h>        /* pick up VDISABLE definition, mayby */
# endif
# ifdef VDISABLE
#  define _POSIX_VDISABLE VDISABLE
# else
#  define _POSIX_VDISABLE ((cc_t)'\377')
# endif
#endif

#define SUBBUFSIZE      256

#if     !defined(P)
# ifdef __STDC__
#  define       P(x)    x
# else
#  define       P(x)    ()
# endif
#endif

extern int
    autologin,          /* Autologin enabled */
    skiprc,             /* Don't process the ~/.telnetrc file */
    eight,              /* use eight bit mode (binary in and/or out */
    family,             /* address family of peer */
    flushout,           /* flush output */
    connected,          /* Are we connected to the other side? */
    globalmode,         /* Mode tty should be in */
    telnetport,         /* Are we connected to the telnet port? */
    localflow,          /* Flow control handled locally */
    restartany,         /* If flow control, restart output on any character */
    localchars,         /* we recognize interrupt/quit */
    donelclchars,       /* the user has set "localchars" */
    showoptions,
    net,                /* Network file descriptor */
    tin,                /* Terminal input file descriptor */
    tout,               /* Terminal output file descriptor */
    crlf,               /* Should '\r' be mapped to <CR><LF> (or <CR><NUL>)? */
    autoflush,          /* flush output when interrupting? */
    autosynch,          /* send interrupt characters with SYNCH? */
    SYNCHing,           /* Is the stream in telnet SYNCH mode? */
    donebinarytoggle,   /* the user has put us in binary */
    dontlecho,          /* do we suppress local echoing right now? */
    crmod,
    netdata,            /* Print out network data flow */
    prettydump,         /* Print "netdata" output in user readable format */
    termdata,           /* Print out terminal data flow */
    telnet_debug,       /* Debug level */
    doaddrlookup,       /* do a reverse lookup? */
    clienteof;          /* Client received EOF */

extern cc_t escape;     /* Escape to command mode */
extern cc_t rlogin;     /* Rlogin mode escape character */
#ifdef  KLUDGELINEMODE
extern cc_t echoc;      /* Toggle local echoing */
#endif

extern char
    *prompt;            /* Prompt for command. */

extern char
    doopt[],
    dont[],
    will[],
    wont[],
    options[],          /* All the little options */
    *hostname;          /* Who are we connected to? */
#ifdef  ENCRYPTION
extern void (*encrypt_output)(unsigned char *, int);
extern int (*decrypt_input)(int);
#endif  /* ENCRYPTION */

/*
 * We keep track of each side of the option negotiation.
 */

#define MY_STATE_WILL           0x01
#define MY_WANT_STATE_WILL      0x02
#define MY_STATE_DO             0x04
#define MY_WANT_STATE_DO        0x08

/*
 * Macros to check the current state of things
 */

#define my_state_is_do(opt)             (options[opt]&MY_STATE_DO)
#define my_state_is_will(opt)           (options[opt]&MY_STATE_WILL)
#define my_want_state_is_do(opt)        (options[opt]&MY_WANT_STATE_DO)
#define my_want_state_is_will(opt)      (options[opt]&MY_WANT_STATE_WILL)

#define my_state_is_dont(opt)           (!my_state_is_do(opt))
#define my_state_is_wont(opt)           (!my_state_is_will(opt))
#define my_want_state_is_dont(opt)      (!my_want_state_is_do(opt))
#define my_want_state_is_wont(opt)      (!my_want_state_is_will(opt))

#define set_my_state_do(opt)            {options[opt] |= MY_STATE_DO;}
#define set_my_state_will(opt)          {options[opt] |= MY_STATE_WILL;}
#define set_my_want_state_do(opt)       {options[opt] |= MY_WANT_STATE_DO;}
#define set_my_want_state_will(opt)     {options[opt] |= MY_WANT_STATE_WILL;}

#define set_my_state_dont(opt)          {options[opt] &= ~MY_STATE_DO;}
#define set_my_state_wont(opt)          {options[opt] &= ~MY_STATE_WILL;}
#define set_my_want_state_dont(opt)     {options[opt] &= ~MY_WANT_STATE_DO;}
#define set_my_want_state_wont(opt)     {options[opt] &= ~MY_WANT_STATE_WILL;}

/*
 * Make everything symetrical
 */

#define HIS_STATE_WILL                  MY_STATE_DO
#define HIS_WANT_STATE_WILL             MY_WANT_STATE_DO
#define HIS_STATE_DO                    MY_STATE_WILL
#define HIS_WANT_STATE_DO               MY_WANT_STATE_WILL

#define his_state_is_do                 my_state_is_will
#define his_state_is_will               my_state_is_do
#define his_want_state_is_do            my_want_state_is_will
#define his_want_state_is_will          my_want_state_is_do

#define his_state_is_dont               my_state_is_wont
#define his_state_is_wont               my_state_is_dont
#define his_want_state_is_dont          my_want_state_is_wont
#define his_want_state_is_wont          my_want_state_is_dont

#define set_his_state_do                set_my_state_will
#define set_his_state_will              set_my_state_do
#define set_his_want_state_do           set_my_want_state_will
#define set_his_want_state_will         set_my_want_state_do

#define set_his_state_dont              set_my_state_wont
#define set_his_state_wont              set_my_state_dont
#define set_his_want_state_dont         set_my_want_state_wont
#define set_his_want_state_wont         set_my_want_state_dont

#if     defined(USE_TERMIO)
#define SIG_FUNC_RET    void
#else
#define SIG_FUNC_RET    int
#endif

#ifdef  SIGINFO
extern SIG_FUNC_RET
    ayt_status(void);
#endif

extern FILE
    *NetTrace;          /* Where debugging output goes */
extern unsigned char
    NetTraceFile[];     /* Name of file where debugging output goes */
extern void
    SetNetTrace(char *);        /* Function to change where debugging goes */
extern unsigned char
    ComPortBaudRate[];  /* Baud rate of the remote end */
extern void
    DoBaudRate(char *); /* Function to set the baud rate of the remote end */

extern jmp_buf
    toplevel;           /* For error conditions. */

extern void
    command(int, const char *, int),
    Dump(char, unsigned char *, int),
    env_init(void),
    Exit(int),
    ExitString(const char *, int),
    init_network(void),
    init_sys(void),
    init_telnet(void),
    init_terminal(void),
    intp(void),
    optionstatus(void),
    printoption(const char *, int, int),
    printsub(char, unsigned char *, int),
    quit(void),
    sendabort(void),
    sendbrk(void),
    sendeof(void),
    sendsusp(void),
    sendnaws(void),
    sendayt(void),
    setconnmode(int),
    setcommandmode(void),
    set_escape_char(char *s),
    setneturg(void),
    sys_telnet_init(void),
    telnet(char *),
    tel_enter_binary(int),
    tel_leave_binary(int),
    TerminalFlushOutput(void),
    TerminalNewMode(int),
    TerminalRestoreState(void),
    TerminalSaveState(void),
    TerminalDefaultChars(void),
    TerminalSpeeds(long *, long *),
    tninit(void),
    upcase(char *),
    willoption(int),
    wontoption(int);

extern void
    send_do(int, int),
    send_dont(int, int),
    send_will(int, int),
    send_wont(int, int);

extern void
    lm_will(unsigned char *, int),
    lm_wont(unsigned char *, int),
    lm_do(unsigned char *, int),
    lm_dont(unsigned char *, int),
    lm_mode(unsigned char *, int, int);

extern void
    slc_init(void),
    slcstate(void),
    slc_mode_export(void),
    slc_mode_import(int),
    slc_import(int),
    slc_export(void),
    slc(unsigned char *, int),
    slc_check(void),
    slc_start_reply(void),
    slc_add_reply(unsigned char, unsigned char, cc_t),
    slc_end_reply(void);
extern int
    getconnmode(void),
    opt_welldefined(const char *),
    NetClose(int),
    netflush(void),
    process_rings(int, int, int, int, int, int),
    rlogin_susp(void),
    SetSockOpt(int, int, int, int),
    slc_update(void),
    stilloob(void),
    telrcv(void),
    TerminalRead(char *, int),
    TerminalWrite(char *, int),
    TerminalAutoFlush(void),
    TerminalWindowSize(long *, long *),
    TerminalSpecialChars(int),
    tn(int, char **),
    ttyflush(int);

extern void
    env_opt(unsigned char *, int),
    env_opt_start(void),
    env_opt_start_info(void),
    env_opt_add(unsigned char *),
    env_opt_end(int);

extern unsigned char
    *env_default(int, int),
    *env_getvalue(const unsigned char *);

extern int
    get_status(char *),
    dosynch(char *);

extern cc_t
    *tcval(int);

#ifndef USE_TERMIO

extern struct   tchars ntc;
extern struct   ltchars nltc;
extern struct   sgttyb nttyb;

# define termEofChar            ntc.t_eofc
# define termEraseChar          nttyb.sg_erase
# define termFlushChar          nltc.t_flushc
# define termIntChar            ntc.t_intrc
# define termKillChar           nttyb.sg_kill
# define termLiteralNextChar    nltc.t_lnextc
# define termQuitChar           ntc.t_quitc
# define termSuspChar           nltc.t_suspc
# define termRprntChar          nltc.t_rprntc
# define termWerasChar          nltc.t_werasc
# define termStartChar          ntc.t_startc
# define termStopChar           ntc.t_stopc
# define termForw1Char          ntc.t_brkc
extern cc_t termForw2Char;
extern cc_t termAytChar;

# define termEofCharp           (cc_t *)&ntc.t_eofc
# define termEraseCharp         (cc_t *)&nttyb.sg_erase
# define termFlushCharp         (cc_t *)&nltc.t_flushc
# define termIntCharp           (cc_t *)&ntc.t_intrc
# define termKillCharp          (cc_t *)&nttyb.sg_kill
# define termLiteralNextCharp   (cc_t *)&nltc.t_lnextc
# define termQuitCharp          (cc_t *)&ntc.t_quitc
# define termSuspCharp          (cc_t *)&nltc.t_suspc
# define termRprntCharp         (cc_t *)&nltc.t_rprntc
# define termWerasCharp         (cc_t *)&nltc.t_werasc
# define termStartCharp         (cc_t *)&ntc.t_startc
# define termStopCharp          (cc_t *)&ntc.t_stopc
# define termForw1Charp         (cc_t *)&ntc.t_brkc
# define termForw2Charp         (cc_t *)&termForw2Char
# define termAytCharp           (cc_t *)&termAytChar

# else

extern struct   termio new_tc;

# define termEofChar            new_tc.c_cc[VEOF]
# define termEraseChar          new_tc.c_cc[VERASE]
# define termIntChar            new_tc.c_cc[VINTR]
# define termKillChar           new_tc.c_cc[VKILL]
# define termQuitChar           new_tc.c_cc[VQUIT]

# ifndef        VSUSP
extern cc_t termSuspChar;
# else
#  define termSuspChar          new_tc.c_cc[VSUSP]
# endif
# if    defined(VFLUSHO) && !defined(VDISCARD)
#  define VDISCARD VFLUSHO
# endif
# ifndef        VDISCARD
extern cc_t termFlushChar;
# else
#  define termFlushChar         new_tc.c_cc[VDISCARD]
# endif
# ifndef VWERASE
extern cc_t termWerasChar;
# else
#  define termWerasChar         new_tc.c_cc[VWERASE]
# endif
# ifndef        VREPRINT
extern cc_t termRprntChar;
# else
#  define termRprntChar         new_tc.c_cc[VREPRINT]
# endif
# ifndef        VLNEXT
extern cc_t termLiteralNextChar;
# else
#  define termLiteralNextChar   new_tc.c_cc[VLNEXT]
# endif
# ifndef        VSTART
extern cc_t termStartChar;
# else
#  define termStartChar         new_tc.c_cc[VSTART]
# endif
# ifndef        VSTOP
extern cc_t termStopChar;
# else
#  define termStopChar          new_tc.c_cc[VSTOP]
# endif
# ifndef        VEOL
extern cc_t termForw1Char;
# else
#  define termForw1Char         new_tc.c_cc[VEOL]
# endif
# ifndef        VEOL2
extern cc_t termForw2Char;
# else
#  define termForw2Char         new_tc.c_cc[VEOL]
# endif
# ifndef        VSTATUS
extern cc_t termAytChar;
#else
#  define termAytChar           new_tc.c_cc[VSTATUS]
#endif

# if defined(__STDC__)
#  define termEofCharp          &termEofChar
#  define termEraseCharp        &termEraseChar
#  define termIntCharp          &termIntChar
#  define termKillCharp         &termKillChar
#  define termQuitCharp         &termQuitChar
#  define termSuspCharp         &termSuspChar
#  define termFlushCharp        &termFlushChar
#  define termWerasCharp        &termWerasChar
#  define termRprntCharp        &termRprntChar
#  define termLiteralNextCharp  &termLiteralNextChar
#  define termStartCharp        &termStartChar
#  define termStopCharp         &termStopChar
#  define termForw1Charp        &termForw1Char
#  define termForw2Charp        &termForw2Char
#  define termAytCharp          &termAytChar
# else
        /* Work around a compiler bug */
#  define termEofCharp          0
#  define termEraseCharp        0
#  define termIntCharp          0
#  define termKillCharp         0
#  define termQuitCharp         0
#  define termSuspCharp         0
#  define termFlushCharp        0
#  define termWerasCharp        0
#  define termRprntCharp        0
#  define termLiteralNextCharp  0
#  define termStartCharp        0
#  define termStopCharp         0
#  define termForw1Charp        0
#  define termForw2Charp        0
#  define termAytCharp          0
# endif
#endif

typedef struct {
    int
        system,                 /* what the current time is */
        echotoggle,             /* last time user entered echo character */
        modenegotiated,         /* last time operating mode negotiated */
        didnetreceive,          /* last time we read data from network */
        gotDM;                  /* when did we last see a data mark */
} Clocks;

extern Clocks clocks;

/* Ring buffer structures which are shared */

extern Ring
    netoring,
    netiring,
    ttyoring,
    ttyiring;

extern void
    xmitAO(void),
    xmitEC(void),
    xmitEL(void);