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[/] [or1k/] [trunk/] [uclinux/] [userland/] [telnet/] [commands.c] - Blame information for rev 1778

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/*
 * 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. All advertising materials mentioning features or use of this software
 *    must display the following acknowledgement:
 *      This product includes software developed by the University of
 *      California, Berkeley and its contributors.
 * 4. 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.
 */
 
#ifndef lint
static char sccsid[] = "@(#)commands.c  8.2 (Berkeley) 12/15/93";
#endif /* not lint */
 
#if     defined(unix)
#include <sys/param.h>
#if     defined(CRAY) || defined(sysV88)
#include <sys/types.h>
#endif
#include <sys/file.h>
#else
#include <sys/types.h>
#endif  /* defined(unix) */
#include <sys/socket.h>
#include <sys/wait.h>
#include <netinet/in.h>
#ifdef  CRAY
#include <fcntl.h>
#endif  /* CRAY */
 
#include <stdlib.h>
#include <string.h>
#include <signal.h>
#include <netdb.h>
#include <ctype.h>
#include <pwd.h>
#include <varargs.h>
#include <errno.h>
#ifdef __linux__
#include <unistd.h>
#endif
 
#include <arpa/telnet.h>
#include <arpa/inet.h>
 
#include "general.h"
 
#include "ring.h"
 
#include "externs.h"
#include "defines.h"
#include "types.h"
 
#if !defined(CRAY) && !defined(sysV88)
#include <netinet/in_systm.h>
# if (defined(vax) || defined(tahoe) || defined(hp300)) && !defined(ultrix)
# include <machine/endian.h>
# endif /* vax */
#endif /* !defined(CRAY) && !defined(sysV88) */
#include <netinet/ip.h>
 
 
#ifndef       MAXHOSTNAMELEN
#define       MAXHOSTNAMELEN 64
#endif        MAXHOSTNAMELEN
 
#if     defined(IPPROTO_IP) && defined(IP_TOS)
int tos = -1;
#endif  /* defined(IPPROTO_IP) && defined(IP_TOS) */
 
char    *hostname;
static char _hostname[MAXHOSTNAMELEN];
 
extern char *getenv();
 
extern int isprefix();
extern char **genget();
extern int Ambiguous();
 
static int call(int (*intrtn_t)(), ...);
 
typedef struct {
        char    *name;          /* command name */
        char    *help;          /* help string (NULL for no help) */
        int     (*handler)();   /* routine which executes command */
        int     needconnect;    /* Do we need to be connected to execute? */
} Command;
 
static char line[256];
static char saveline[256];
static int margc;
static char *margv[20];
 
#if     defined(SKEY)
#include <sys/wait.h>
#define PATH_SKEY       "/usr/bin/key"
    int
skey_calc(argc, argv)
        int argc;
        char **argv;
{
        int status;
 
        if(argc != 3) {
                printf("%s sequence challenge\n", argv[0]);
                return;
        }
 
        switch(fork()) {
        case 0:
                execv(PATH_SKEY, argv);
                exit (1);
        case -1:
                perror("fork");
                break;
        default:
                (void) wait(&status);
                if (WIFEXITED(status))
                        return (WEXITSTATUS(status));
                return (0);
        }
}
#endif
 
    static void
makeargv()
{
    register char *cp, *cp2, c;
    register char **argp = margv;
 
    margc = 0;
    cp = line;
    if (*cp == '!') {           /* Special case shell escape */
        strcpy(saveline, line); /* save for shell command */
        *argp++ = "!";          /* No room in string to get this */
        margc++;
        cp++;
    }
    while (c = *cp) {
        register int inquote = 0;
        while (isspace(c))
            c = *++cp;
        if (c == '\0')
            break;
        *argp++ = cp;
        margc += 1;
        for (cp2 = cp; c != '\0'; c = *++cp) {
            if (inquote) {
                if (c == inquote) {
                    inquote = 0;
                    continue;
                }
            } else {
                if (c == '\\') {
                    if ((c = *++cp) == '\0')
                        break;
                } else if (c == '"') {
                    inquote = '"';
                    continue;
                } else if (c == '\'') {
                    inquote = '\'';
                    continue;
                } else if (isspace(c))
                    break;
            }
            *cp2++ = c;
        }
        *cp2 = '\0';
        if (c == '\0')
            break;
        cp++;
    }
    *argp++ = 0;
}
 
/*
 * Make a character string into a number.
 *
 * Todo:  1.  Could take random integers (12, 0x12, 012, 0b1).
 */
 
        static
special(s)
        register char *s;
{
        register char c;
        char b;
 
        switch (*s) {
        case '^':
                b = *++s;
                if (b == '?') {
                    c = b | 0x40;               /* DEL */
                } else {
                    c = b & 0x1f;
                }
                break;
        default:
                c = *s;
                break;
        }
        return c;
}
 
/*
 * Construct a control character sequence
 * for a special character.
 */
        static char *
control(c)
        register cc_t c;
{
        static char buf[5];
        /*
         * The only way I could get the Sun 3.5 compiler
         * to shut up about
         *      if ((unsigned int)c >= 0x80)
         * was to assign "c" to an unsigned int variable...
         * Arggg....
         */
        register unsigned int uic = (unsigned int)c;
 
        if (uic == 0x7f)
                return ("^?");
        if (c == (cc_t)_POSIX_VDISABLE) {
                return "off";
        }
        if (uic >= 0x80) {
                buf[0] = '\\';
                buf[1] = ((c>>6)&07) + '0';
                buf[2] = ((c>>3)&07) + '0';
                buf[3] = (c&07) + '0';
                buf[4] = 0;
        } else if (uic >= 0x20) {
                buf[0] = c;
                buf[1] = 0;
        } else {
                buf[0] = '^';
                buf[1] = '@'+c;
                buf[2] = 0;
        }
        return (buf);
}
 
 
 
/*
 *      The following are data structures and routines for
 *      the "send" command.
 *
 */
 
struct sendlist {
    char        *name;          /* How user refers to it (case independent) */
    char        *help;          /* Help information (0 ==> no help) */
    int         needconnect;    /* Need to be connected */
    int         narg;           /* Number of arguments */
    int         (*handler)();   /* Routine to perform (for special ops) */
    int         nbyte;          /* Number of bytes to send this command */
    int         what;           /* Character to be sent (<0 ==> special) */
};
 
 
static int
        send_esc P((void)),
        send_help P((void)),
        send_docmd P((char *)),
        send_dontcmd P((char *)),
        send_willcmd P((char *)),
        send_wontcmd P((char *));
 
static struct sendlist Sendlist[] = {
    { "ao",     "Send Telnet Abort output",             1, 0, 0, 2, AO },
    { "ayt",    "Send Telnet 'Are You There'",          1, 0, 0, 2, AYT },
    { "brk",    "Send Telnet Break",                    1, 0, 0, 2, BREAK },
    { "break",  0,                                       1, 0, 0, 2, BREAK },
    { "ec",     "Send Telnet Erase Character",          1, 0, 0, 2, EC },
    { "el",     "Send Telnet Erase Line",               1, 0, 0, 2, EL },
    { "escape", "Send current escape character",        1, 0, send_esc, 1, 0 },
    { "ga",     "Send Telnet 'Go Ahead' sequence",      1, 0, 0, 2, GA },
    { "ip",     "Send Telnet Interrupt Process",        1, 0, 0, 2, IP },
    { "intp",   0,                                       1, 0, 0, 2, IP },
    { "interrupt", 0,                                    1, 0, 0, 2, IP },
    { "intr",   0,                                       1, 0, 0, 2, IP },
    { "nop",    "Send Telnet 'No operation'",           1, 0, 0, 2, NOP },
    { "eor",    "Send Telnet 'End of Record'",          1, 0, 0, 2, EOR },
    { "abort",  "Send Telnet 'Abort Process'",          1, 0, 0, 2, ABORT },
    { "susp",   "Send Telnet 'Suspend Process'",        1, 0, 0, 2, SUSP },
    { "eof",    "Send Telnet End of File Character",    1, 0, 0, 2, xEOF },
    { "synch",  "Perform Telnet 'Synch operation'",     1, 0, dosynch, 2, 0 },
    { "getstatus", "Send request for STATUS",           1, 0, get_status, 6, 0 },
    { "?",      "Display send options",                 0, 0, send_help, 0, 0 },
    { "help",   0,                                       0, 0, send_help, 0, 0 },
    { "do",     0,                                       0, 1, send_docmd, 3, 0 },
    { "dont",   0,                                       0, 1, send_dontcmd, 3, 0 },
    { "will",   0,                                       0, 1, send_willcmd, 3, 0 },
    { "wont",   0,                                       0, 1, send_wontcmd, 3, 0 },
    { 0 }
};
 
#define GETSEND(name) ((struct sendlist *) genget(name, (char **) Sendlist, \
                                sizeof(struct sendlist)))
    /*VARARGS*/
    static
bye(argc, argv)
    int  argc;          /* Number of arguments */
    char *argv[];       /* arguments */
{
    extern int resettermname;
 
    if (connected) {
        (void) shutdown(net, 2);
        printf("Connection closed.\n");
        (void) NetClose(net);
        connected = 0;
        resettermname = 1;
#if     defined(AUTHENTICATION)
        auth_encrypt_connect(connected);
#endif  /* defined(AUTHENTICATION) */
        /* reset options */
        tninit();
#if     defined(TN3270)
        SetIn3270();            /* Get out of 3270 mode */
#endif  /* defined(TN3270) */
    }
    if ((argc != 2) || (strcmp(argv[1], "fromquit") != 0)) {
#ifdef EMBED
        printf("ERROR: no longjmp()\n");
        exit(1);
#else
        longjmp(toplevel, 1);
#endif
        /* NOTREACHED */
    }
    return 1;                   /* Keep lint, etc., happy */
}
 
/*VARARGS*/
    void
quit()
{
        (void) call(bye, "bye", "fromquit", 0);
        Exit(0);
        /*NOTREACHED*/
}
 
 
    static int
sendcmd(argc, argv)
    int  argc;
    char **argv;
{
    int count;          /* how many bytes we are going to need to send */
    int i;
    int question = 0;    /* was at least one argument a question */
    struct sendlist *s; /* pointer to current command */
    int success = 0;
    int needconnect = 0;
 
    if (argc < 2) {
        printf("need at least one argument for 'send' command\n");
        printf("'send ?' for help\n");
        return 0;
    }
    /*
     * First, validate all the send arguments.
     * In addition, we see how much space we are going to need, and
     * whether or not we will be doing a "SYNCH" operation (which
     * flushes the network queue).
     */
    count = 0;
    for (i = 1; i < argc; i++) {
        s = GETSEND(argv[i]);
        if (s == 0) {
            printf("Unknown send argument '%s'\n'send ?' for help.\n",
                        argv[i]);
            return 0;
        } else if (Ambiguous(s)) {
            printf("Ambiguous send argument '%s'\n'send ?' for help.\n",
                        argv[i]);
            return 0;
        }
        if (i + s->narg >= argc) {
            fprintf(stderr,
            "Need %d argument%s to 'send %s' command.  'send %s ?' for help.\n",
                s->narg, s->narg == 1 ? "" : "s", s->name, s->name);
            return 0;
        }
        count += s->nbyte;
        if (s->handler == send_help) {
            send_help();
            return 0;
        }
 
        i += s->narg;
        needconnect += s->needconnect;
    }
    if (!connected && needconnect) {
        printf("?Need to be connected first.\n");
        printf("'send ?' for help\n");
        return 0;
    }
    /* Now, do we have enough room? */
    if (NETROOM() < count) {
        printf("There is not enough room in the buffer TO the network\n");
        printf("to process your request.  Nothing will be done.\n");
        printf("('send synch' will throw away most data in the network\n");
        printf("buffer, if this might help.)\n");
        return 0;
    }
    /* OK, they are all OK, now go through again and actually send */
    count = 0;
    for (i = 1; i < argc; i++) {
        if ((s = GETSEND(argv[i])) == 0) {
            fprintf(stderr, "Telnet 'send' error - argument disappeared!\n");
            (void) quit();
            /*NOTREACHED*/
        }
        if (s->handler) {
            count++;
            success += (*s->handler)((s->narg > 0) ? argv[i+1] : 0,
                                  (s->narg > 1) ? argv[i+2] : 0);
            i += s->narg;
        } else {
            NET2ADD(IAC, s->what);
            printoption("SENT", IAC, s->what);
        }
    }
    return (count == success);
}
 
    static int
send_esc()
{
    NETADD(escape);
    return 1;
}
 
    int
send_tncmd(func, cmd, name)
    void        (*func)();
    char        *cmd, *name;
{
    char **cpp;
    extern char *telopts[];
    register int val = 0;
 
    if (isprefix(name, "help") || isprefix(name, "?")) {
        register int col, len;
 
        printf("Usage: send %s <value|option>\n", cmd);
        printf("\"value\" must be from 0 to 255\n");
        printf("Valid options are:\n\t");
 
        col = 8;
        for (cpp = telopts; *cpp; cpp++) {
            len = strlen(*cpp) + 3;
            if (col + len > 65) {
                printf("\n\t");
                col = 8;
            }
            printf(" \"%s\"", *cpp);
            col += len;
        }
        printf("\n");
        return 0;
    }
    cpp = (char **)genget(name, telopts, sizeof(char *));
    if (Ambiguous(cpp)) {
        fprintf(stderr,"'%s': ambiguous argument ('send %s ?' for help).\n",
                                        name, cmd);
        return 0;
    }
    if (cpp) {
        val = cpp - telopts;
    } else {
        register char *cp = name;
 
        while (*cp >= '0' && *cp <= '9') {
            val *= 10;
            val += *cp - '0';
            cp++;
        }
        if (*cp != 0) {
            fprintf(stderr, "'%s': unknown argument ('send %s ?' for help).\n",
                                        name, cmd);
            return 0;
        } else if (val < 0 || val > 255) {
            fprintf(stderr, "'%s': bad value ('send %s ?' for help).\n",
                                        name, cmd);
            return 0;
        }
    }
    if (!connected) {
        printf("?Need to be connected first.\n");
        return 0;
    }
    (*func)(val, 1);
    return 1;
}
 
    static int
send_docmd(name)
    char *name;
{
    return(send_tncmd(send_do, "do", name));
}
 
    static int
send_dontcmd(name)
    char *name;
{
    return(send_tncmd(send_dont, "dont", name));
}
    static int
send_willcmd(name)
    char *name;
{
    return(send_tncmd(send_will, "will", name));
}
    static int
send_wontcmd(name)
    char *name;
{
    return(send_tncmd(send_wont, "wont", name));
}
 
    static int
send_help()
{
    struct sendlist *s; /* pointer to current command */
    for (s = Sendlist; s->name; s++) {
        if (s->help)
            printf("%-15s %s\n", s->name, s->help);
    }
    return(0);
}
 
/*
 * The following are the routines and data structures referred
 * to by the arguments to the "toggle" command.
 */
 
    static int
lclchars()
{
    donelclchars = 1;
    return 1;
}
 
    static int
togdebug()
{
#ifndef NOT43
    if (net > 0 &&
        (SetSockOpt(net, SOL_SOCKET, SO_DEBUG, debug)) < 0) {
            perror("setsockopt (SO_DEBUG)");
    }
#else   /* NOT43 */
    if (debug) {
        if (net > 0 && SetSockOpt(net, SOL_SOCKET, SO_DEBUG, 1) < 0)
            perror("setsockopt (SO_DEBUG)");
    } else
        printf("Cannot turn off socket debugging\n");
#endif  /* NOT43 */
    return 1;
}
 
 
    static int
togcrlf()
{
    if (crlf) {
        printf("Will send carriage returns as telnet <CR><LF>.\n");
    } else {
        printf("Will send carriage returns as telnet <CR><NUL>.\n");
    }
    return 1;
}
 
int binmode;
 
    static int
togbinary(val)
    int val;
{
    donebinarytoggle = 1;
 
    if (val >= 0) {
        binmode = val;
    } else {
        if (my_want_state_is_will(TELOPT_BINARY) &&
                                my_want_state_is_do(TELOPT_BINARY)) {
            binmode = 1;
        } else if (my_want_state_is_wont(TELOPT_BINARY) &&
                                my_want_state_is_dont(TELOPT_BINARY)) {
            binmode = 0;
        }
        val = binmode ? 0 : 1;
    }
 
    if (val == 1) {
        if (my_want_state_is_will(TELOPT_BINARY) &&
                                        my_want_state_is_do(TELOPT_BINARY)) {
            printf("Already operating in binary mode with remote host.\n");
        } else {
            printf("Negotiating binary mode with remote host.\n");
            tel_enter_binary(3);
        }
    } else {
        if (my_want_state_is_wont(TELOPT_BINARY) &&
                                        my_want_state_is_dont(TELOPT_BINARY)) {
            printf("Already in network ascii mode with remote host.\n");
        } else {
            printf("Negotiating network ascii mode with remote host.\n");
            tel_leave_binary(3);
        }
    }
    return 1;
}
 
    static int
togrbinary(val)
    int val;
{
    donebinarytoggle = 1;
 
    if (val == -1)
        val = my_want_state_is_do(TELOPT_BINARY) ? 0 : 1;
 
    if (val == 1) {
        if (my_want_state_is_do(TELOPT_BINARY)) {
            printf("Already receiving in binary mode.\n");
        } else {
            printf("Negotiating binary mode on input.\n");
            tel_enter_binary(1);
        }
    } else {
        if (my_want_state_is_dont(TELOPT_BINARY)) {
            printf("Already receiving in network ascii mode.\n");
        } else {
            printf("Negotiating network ascii mode on input.\n");
            tel_leave_binary(1);
        }
    }
    return 1;
}
 
    static int
togxbinary(val)
    int val;
{
    donebinarytoggle = 1;
 
    if (val == -1)
        val = my_want_state_is_will(TELOPT_BINARY) ? 0 : 1;
 
    if (val == 1) {
        if (my_want_state_is_will(TELOPT_BINARY)) {
            printf("Already transmitting in binary mode.\n");
        } else {
            printf("Negotiating binary mode on output.\n");
            tel_enter_binary(2);
        }
    } else {
        if (my_want_state_is_wont(TELOPT_BINARY)) {
            printf("Already transmitting in network ascii mode.\n");
        } else {
            printf("Negotiating network ascii mode on output.\n");
            tel_leave_binary(2);
        }
    }
    return 1;
}
 
 
static int togglehelp P((void));
#if     defined(AUTHENTICATION)
extern int auth_togdebug P((int));
#endif
 
struct togglelist {
    char        *name;          /* name of toggle */
    char        *help;          /* help message */
    int         (*handler)();   /* routine to do actual setting */
    int         *variable;
    char        *actionexplanation;
};
 
static struct togglelist Togglelist[] = {
    { "autoflush",
        "flushing of output when sending interrupt characters",
            0,
                &autoflush,
                    "flush output when sending interrupt characters" },
    { "autosynch",
        "automatic sending of interrupt characters in urgent mode",
            0,
                &autosynch,
                    "send interrupt characters in urgent mode" },
#if     defined(AUTHENTICATION)
    { "autologin",
        "automatic sending of login and/or authentication info",
            0,
                &autologin,
                    "send login name and/or authentication information" },
    { "authdebug",
        "Toggle authentication debugging",
            auth_togdebug,
                0,
                     "print authentication debugging information" },
#endif
    { "skiprc",
        "don't read ~/.telnetrc file",
            0,
                &skiprc,
                    "skip reading of ~/.telnetrc file" },
    { "binary",
        "sending and receiving of binary data",
            togbinary,
                0,
 
    { "inbinary",
        "receiving of binary data",
            togrbinary,
                0,
 
    { "outbinary",
        "sending of binary data",
            togxbinary,
                0,
 
    { "crlf",
        "sending carriage returns as telnet <CR><LF>",
            togcrlf,
                &crlf,
 
    { "crmod",
        "mapping of received carriage returns",
            0,
                &crmod,
                    "map carriage return on output" },
    { "localchars",
        "local recognition of certain control characters",
            lclchars,
                &localchars,
                    "recognize certain control characters" },
    { " ", "", 0 },              /* empty line */
#if     defined(unix) && defined(TN3270)
    { "apitrace",
        "(debugging) toggle tracing of API transactions",
            0,
                &apitrace,
                    "trace API transactions" },
    { "cursesdata",
        "(debugging) toggle printing of hexadecimal curses data",
            0,
                &cursesdata,
                    "print hexadecimal representation of curses data" },
#endif  /* defined(unix) && defined(TN3270) */
    { "debug",
        "debugging",
            togdebug,
                &debug,
                    "turn on socket level debugging" },
    { "netdata",
        "printing of hexadecimal network data (debugging)",
            0,
                &netdata,
                    "print hexadecimal representation of network traffic" },
    { "prettydump",
        "output of \"netdata\" to user readable format (debugging)",
            0,
                &prettydump,
                    "print user readable output for \"netdata\"" },
    { "options",
        "viewing of options processing (debugging)",
            0,
                &showoptions,
                    "show option processing" },
#if     defined(unix)
    { "termdata",
        "(debugging) toggle printing of hexadecimal terminal data",
            0,
                &termdata,
                    "print hexadecimal representation of terminal traffic" },
#endif  /* defined(unix) */
    { "?",
        0,
            togglehelp },
    { "help",
        0,
            togglehelp },
    { 0 }
};
 
    static int
togglehelp()
{
    struct togglelist *c;
 
    for (c = Togglelist; c->name; c++) {
        if (c->help) {
            if (*c->help)
                printf("%-15s toggle %s\n", c->name, c->help);
            else
                printf("\n");
        }
    }
    printf("\n");
    printf("%-15s %s\n", "?", "display help information");
    return 0;
}
 
    static void
settogglehelp(set)
    int set;
{
    struct togglelist *c;
 
    for (c = Togglelist; c->name; c++) {
        if (c->help) {
            if (*c->help)
                printf("%-15s %s %s\n", c->name, set ? "enable" : "disable",
                                                c->help);
            else
                printf("\n");
        }
    }
}
 
#define GETTOGGLE(name) (struct togglelist *) \
                genget(name, (char **) Togglelist, sizeof(struct togglelist))
 
    static int
toggle(argc, argv)
    int  argc;
    char *argv[];
{
    int retval = 1;
    char *name;
    struct togglelist *c;
 
    if (argc < 2) {
        fprintf(stderr,
            "Need an argument to 'toggle' command.  'toggle ?' for help.\n");
        return 0;
    }
    argc--;
    argv++;
    while (argc--) {
        name = *argv++;
        c = GETTOGGLE(name);
        if (Ambiguous(c)) {
            fprintf(stderr, "'%s': ambiguous argument ('toggle ?' for help).\n",
                                        name);
            return 0;
        } else if (c == 0) {
            fprintf(stderr, "'%s': unknown argument ('toggle ?' for help).\n",
                                        name);
            return 0;
        } else {
            if (c->variable) {
                *c->variable = !*c->variable;           /* invert it */
                if (c->actionexplanation) {
                    printf("%s %s.\n", *c->variable? "Will" : "Won't",
                                                        c->actionexplanation);
                }
            }
            if (c->handler) {
                retval &= (*c->handler)(-1);
            }
        }
    }
    return retval;
}
 
/*
 * The following perform the "set" command.
 */
 
struct setlist {
    char *name;                         /* name */
    char *help;                         /* help information */
    void (*handler)();
    cc_t *charp;                        /* where it is located at */
};
 
static struct setlist Setlist[] = {
#ifdef  KLUDGELINEMODE
    { "echo",   "character to toggle local echoing on/off", 0, &echoc },
#endif
    { "escape", "character to escape back to telnet command mode", 0, &escape },
    { "rlogin", "rlogin escape character", 0, &rlogin },
    { "tracefile", "file to write trace information to", SetNetTrace, (cc_t *)NetTraceFile},
    { " ", "" },
    { " ", "The following need 'localchars' to be toggled true", 0, 0 },
    { "flushoutput", "character to cause an Abort Output", 0, termFlushCharp },
    { "interrupt", "character to cause an Interrupt Process", 0, termIntCharp },
    { "quit",   "character to cause an Abort process", 0, termQuitCharp },
    { "eof",    "character to cause an EOF ", 0, termEofCharp },
    { " ", "" },
    { " ", "The following are for local editing in linemode", 0, 0 },
    { "erase",  "character to use to erase a character", 0, termEraseCharp },
    { "kill",   "character to use to erase a line", 0, termKillCharp },
    { "lnext",  "character to use for literal next", 0, termLiteralNextCharp },
    { "susp",   "character to cause a Suspend Process", 0, termSuspCharp },
    { "reprint", "character to use for line reprint", 0, termRprntCharp },
    { "worderase", "character to use to erase a word", 0, termWerasCharp },
    { "start",  "character to use for XON", 0, termStartCharp },
    { "stop",   "character to use for XOFF", 0, termStopCharp },
    { "forw1",  "alternate end of line character", 0, termForw1Charp },
    { "forw2",  "alternate end of line character", 0, termForw2Charp },
    { "ayt",    "alternate AYT character", 0, termAytCharp },
    { 0 }
};
 
#if     defined(CRAY) && !defined(__STDC__)
/* Work around compiler bug in pcc 4.1.5 */
    void
_setlist_init()
{
#ifndef KLUDGELINEMODE
#define N 5
#else
#define N 6
#endif
        Setlist[N+0].charp = &termFlushChar;
        Setlist[N+1].charp = &termIntChar;
        Setlist[N+2].charp = &termQuitChar;
        Setlist[N+3].charp = &termEofChar;
        Setlist[N+6].charp = &termEraseChar;
        Setlist[N+7].charp = &termKillChar;
        Setlist[N+8].charp = &termLiteralNextChar;
        Setlist[N+9].charp = &termSuspChar;
        Setlist[N+10].charp = &termRprntChar;
        Setlist[N+11].charp = &termWerasChar;
        Setlist[N+12].charp = &termStartChar;
        Setlist[N+13].charp = &termStopChar;
        Setlist[N+14].charp = &termForw1Char;
        Setlist[N+15].charp = &termForw2Char;
        Setlist[N+16].charp = &termAytChar;
#undef  N
}
#endif  /* defined(CRAY) && !defined(__STDC__) */
 
    static struct setlist *
getset(name)
    char *name;
{
    return (struct setlist *)
                genget(name, (char **) Setlist, sizeof(struct setlist));
}
 
    void
set_escape_char(s)
    char *s;
{
        if (rlogin != _POSIX_VDISABLE) {
                rlogin = (s && *s) ? special(s) : _POSIX_VDISABLE;
                printf("Telnet rlogin escape character is '%s'.\n",
                                        control(rlogin));
        } else {
                escape = (s && *s) ? special(s) : _POSIX_VDISABLE;
                printf("Telnet escape character is '%s'.\n", control(escape));
        }
}
 
    static int
setcmd(argc, argv)
    int  argc;
    char *argv[];
{
    int value;
    struct setlist *ct;
    struct togglelist *c;
 
    if (argc < 2 || argc > 3) {
        printf("Format is 'set Name Value'\n'set ?' for help.\n");
        return 0;
    }
    if ((argc == 2) && (isprefix(argv[1], "?") || isprefix(argv[1], "help"))) {
        for (ct = Setlist; ct->name; ct++)
            printf("%-15s %s\n", ct->name, ct->help);
        printf("\n");
        settogglehelp(1);
        printf("%-15s %s\n", "?", "display help information");
        return 0;
    }
 
    ct = getset(argv[1]);
    if (ct == 0) {
        c = GETTOGGLE(argv[1]);
        if (c == 0) {
            fprintf(stderr, "'%s': unknown argument ('set ?' for help).\n",
                        argv[1]);
            return 0;
        } else if (Ambiguous(c)) {
            fprintf(stderr, "'%s': ambiguous argument ('set ?' for help).\n",
                        argv[1]);
            return 0;
        }
        if (c->variable) {
            if ((argc == 2) || (strcmp("on", argv[2]) == 0))
                *c->variable = 1;
            else if (strcmp("off", argv[2]) == 0)
                *c->variable = 0;
            else {
                printf("Format is 'set togglename [on|off]'\n'set ?' for help.\n");
                return 0;
            }
            if (c->actionexplanation) {
                printf("%s %s.\n", *c->variable? "Will" : "Won't",
                                                        c->actionexplanation);
            }
        }
        if (c->handler)
            (*c->handler)(1);
    } else if (argc != 3) {
        printf("Format is 'set Name Value'\n'set ?' for help.\n");
        return 0;
    } else if (Ambiguous(ct)) {
        fprintf(stderr, "'%s': ambiguous argument ('set ?' for help).\n",
                        argv[1]);
        return 0;
    } else if (ct->handler) {
        (*ct->handler)(argv[2]);
        printf("%s set to \"%s\".\n", ct->name, (char *)ct->charp);
    } else {
        if (strcmp("off", argv[2])) {
            value = special(argv[2]);
        } else {
            value = _POSIX_VDISABLE;
        }
        *(ct->charp) = (cc_t)value;
        printf("%s character is '%s'.\n", ct->name, control(*(ct->charp)));
    }
    slc_check();
    return 1;
}
 
    static int
unsetcmd(argc, argv)
    int  argc;
    char *argv[];
{
    struct setlist *ct;
    struct togglelist *c;
    register char *name;
 
    if (argc < 2) {
        fprintf(stderr,
            "Need an argument to 'unset' command.  'unset ?' for help.\n");
        return 0;
    }
    if (isprefix(argv[1], "?") || isprefix(argv[1], "help")) {
        for (ct = Setlist; ct->name; ct++)
            printf("%-15s %s\n", ct->name, ct->help);
        printf("\n");
        settogglehelp(0);
        printf("%-15s %s\n", "?", "display help information");
        return 0;
    }
 
    argc--;
    argv++;
    while (argc--) {
        name = *argv++;
        ct = getset(name);
        if (ct == 0) {
            c = GETTOGGLE(name);
            if (c == 0) {
                fprintf(stderr, "'%s': unknown argument ('unset ?' for help).\n",
                        name);
                return 0;
            } else if (Ambiguous(c)) {
                fprintf(stderr, "'%s': ambiguous argument ('unset ?' for help).\n",
                        name);
                return 0;
            }
            if (c->variable) {
                *c->variable = 0;
                if (c->actionexplanation) {
                    printf("%s %s.\n", *c->variable? "Will" : "Won't",
                                                        c->actionexplanation);
                }
            }
            if (c->handler)
                (*c->handler)(0);
        } else if (Ambiguous(ct)) {
            fprintf(stderr, "'%s': ambiguous argument ('unset ?' for help).\n",
                        name);
            return 0;
        } else if (ct->handler) {
            (*ct->handler)(0);
            printf("%s reset to \"%s\".\n", ct->name, (char *)ct->charp);
        } else {
            *(ct->charp) = _POSIX_VDISABLE;
            printf("%s character is '%s'.\n", ct->name, control(*(ct->charp)));
        }
    }
    return 1;
}
 
/*
 * The following are the data structures and routines for the
 * 'mode' command.
 */
#ifdef  KLUDGELINEMODE
extern int kludgelinemode;
 
    static int
dokludgemode()
{
    kludgelinemode = 1;
    send_wont(TELOPT_LINEMODE, 1);
    send_dont(TELOPT_SGA, 1);
    send_dont(TELOPT_ECHO, 1);
}
#endif
 
    static int
dolinemode()
{
#ifdef  KLUDGELINEMODE
    if (kludgelinemode)
        send_dont(TELOPT_SGA, 1);
#endif
    send_will(TELOPT_LINEMODE, 1);
    send_dont(TELOPT_ECHO, 1);
    return 1;
}
 
    static int
docharmode()
{
#ifdef  KLUDGELINEMODE
    if (kludgelinemode)
        send_do(TELOPT_SGA, 1);
    else
#endif
    send_wont(TELOPT_LINEMODE, 1);
    send_do(TELOPT_ECHO, 1);
    return 1;
}
 
    static int
dolmmode(bit, on)
    int bit, on;
{
    unsigned char c;
    extern int linemode;
 
    if (my_want_state_is_wont(TELOPT_LINEMODE)) {
        printf("?Need to have LINEMODE option enabled first.\n");
        printf("'mode ?' for help.\n");
        return 0;
    }
 
    if (on)
        c = (linemode | bit);
    else
        c = (linemode & ~bit);
    lm_mode(&c, 1, 1);
    return 1;
}
 
    int
setmode(bit)
{
    return dolmmode(bit, 1);
}
 
    int
clearmode(bit)
{
    return dolmmode(bit, 0);
}
 
struct modelist {
        char    *name;          /* command name */
        char    *help;          /* help string */
        int     (*handler)();   /* routine which executes command */
        int     needconnect;    /* Do we need to be connected to execute? */
        int     arg1;
};
 
extern int modehelp();
 
static struct modelist ModeList[] = {
    { "character", "Disable LINEMODE option",   docharmode, 1 },
#ifdef  KLUDGELINEMODE
    { "",       "(or disable obsolete line-by-line mode)", 0 },
#endif
    { "line",   "Enable LINEMODE option",       dolinemode, 1 },
#ifdef  KLUDGELINEMODE
    { "",       "(or enable obsolete line-by-line mode)", 0 },
#endif
    { "", "", 0 },
    { "",       "These require the LINEMODE option to be enabled", 0 },
    { "isig",   "Enable signal trapping",       setmode, 1, MODE_TRAPSIG },
    { "+isig",  0,                               setmode, 1, MODE_TRAPSIG },
    { "-isig",  "Disable signal trapping",      clearmode, 1, MODE_TRAPSIG },
    { "edit",   "Enable character editing",     setmode, 1, MODE_EDIT },
    { "+edit",  0,                               setmode, 1, MODE_EDIT },
    { "-edit",  "Disable character editing",    clearmode, 1, MODE_EDIT },
    { "softtabs", "Enable tab expansion",       setmode, 1, MODE_SOFT_TAB },
    { "+softtabs", 0,                            setmode, 1, MODE_SOFT_TAB },
    { "-softtabs", "Disable character editing", clearmode, 1, MODE_SOFT_TAB },
    { "litecho", "Enable literal character echo", setmode, 1, MODE_LIT_ECHO },
    { "+litecho", 0,                             setmode, 1, MODE_LIT_ECHO },
    { "-litecho", "Disable literal character echo", clearmode, 1, MODE_LIT_ECHO },
    { "help",   0,                               modehelp, 0 },
#ifdef  KLUDGELINEMODE
    { "kludgeline", 0,                           dokludgemode, 1 },
#endif
    { "", "", 0 },
    { "?",      "Print help information",       modehelp, 0 },
    { 0 },
};
 
 
    int
modehelp()
{
    struct modelist *mt;
 
    printf("format is:  'mode Mode', where 'Mode' is one of:\n\n");
    for (mt = ModeList; mt->name; mt++) {
        if (mt->help) {
            if (*mt->help)
                printf("%-15s %s\n", mt->name, mt->help);
            else
                printf("\n");
        }
    }
    return 0;
}
 
#define GETMODECMD(name) (struct modelist *) \
                genget(name, (char **) ModeList, sizeof(struct modelist))
 
    static int
modecmd(argc, argv)
    int  argc;
    char *argv[];
{
    struct modelist *mt;
 
    if (argc != 2) {
        printf("'mode' command requires an argument\n");
        printf("'mode ?' for help.\n");
    } else if ((mt = GETMODECMD(argv[1])) == 0) {
        fprintf(stderr, "Unknown mode '%s' ('mode ?' for help).\n", argv[1]);
    } else if (Ambiguous(mt)) {
        fprintf(stderr, "Ambiguous mode '%s' ('mode ?' for help).\n", argv[1]);
    } else if (mt->needconnect && !connected) {
        printf("?Need to be connected first.\n");
        printf("'mode ?' for help.\n");
    } else if (mt->handler) {
        return (*mt->handler)(mt->arg1);
    }
    return 0;
}
 
/*
 * The following data structures and routines implement the
 * "display" command.
 */
 
    static int
display(argc, argv)
    int  argc;
    char *argv[];
{
    struct togglelist *tl;
    struct setlist *sl;
 
#define dotog(tl)       if (tl->variable && tl->actionexplanation) { \
                            if (*tl->variable) { \
                                printf("will"); \
                            } else { \
                                printf("won't"); \
                            } \
                            printf(" %s.\n", tl->actionexplanation); \
                        }
 
#define doset(sl)   if (sl->name && *sl->name != ' ') { \
                        if (sl->handler == 0) \
                            printf("%-15s [%s]\n", sl->name, control(*sl->charp)); \
                        else \
                            printf("%-15s \"%s\"\n", sl->name, (char *)sl->charp); \
                    }
 
    if (argc == 1) {
        for (tl = Togglelist; tl->name; tl++) {
            dotog(tl);
        }
        printf("\n");
        for (sl = Setlist; sl->name; sl++) {
            doset(sl);
        }
    } else {
        int i;
 
        for (i = 1; i < argc; i++) {
            sl = getset(argv[i]);
            tl = GETTOGGLE(argv[i]);
            if (Ambiguous(sl) || Ambiguous(tl)) {
                printf("?Ambiguous argument '%s'.\n", argv[i]);
                return 0;
            } else if (!sl && !tl) {
                printf("?Unknown argument '%s'.\n", argv[i]);
                return 0;
            } else {
                if (tl) {
                    dotog(tl);
                }
                if (sl) {
                    doset(sl);
                }
            }
        }
    }
/*@*/optionstatus();
    return 1;
#undef  doset
#undef  dotog
}
 
/*
 * The following are the data structures, and many of the routines,
 * relating to command processing.
 */
 
/*
 * Set the escape character.
 */
        static int
setescape(argc, argv)
        int argc;
        char *argv[];
{
        register char *arg;
        char buf[50];
 
        printf(
            "Deprecated usage - please use 'set escape%s%s' in the future.\n",
                                (argc > 2)? " ":"", (argc > 2)? argv[1]: "");
        if (argc > 2)
                arg = argv[1];
        else {
                printf("new escape character: ");
                (void) fgets(buf, sizeof(buf), stdin);
                arg = buf;
        }
        if (arg[0] != '\0')
                escape = arg[0];
        if (!In3270) {
                printf("Escape character is '%s'.\n", control(escape));
        }
        (void) fflush(stdout);
        return 1;
}
 
    /*VARARGS*/
    static int
togcrmod()
{
    crmod = !crmod;
    printf("Deprecated usage - please use 'toggle crmod' in the future.\n");
    printf("%s map carriage return on output.\n", crmod ? "Will" : "Won't");
    (void) fflush(stdout);
    return 1;
}
 
    /*VARARGS*/
    int
suspend()
{
#ifdef  SIGTSTP
    setcommandmode();
    {
        long oldrows, oldcols, newrows, newcols, err;
 
        err = (TerminalWindowSize(&oldrows, &oldcols) == 0) ? 1 : 0;
        (void) kill(0, SIGTSTP);
        /*
         * If we didn't get the window size before the SUSPEND, but we
         * can get them now (???), then send the NAWS to make sure that
         * we are set up for the right window size.
         */
        if (TerminalWindowSize(&newrows, &newcols) && connected &&
            (err || ((oldrows != newrows) || (oldcols != newcols)))) {
                sendnaws();
        }
    }
    /* reget parameters in case they were changed */
    TerminalSaveState();
    setconnmode(0);
#else
    printf("Suspend is not supported.  Try the '!' command instead\n");
#endif
    return 1;
}
 
#if     !defined(TN3270)
    /*ARGSUSED*/
    int
shell(argc, argv)
    int argc;
    char *argv[];
{
    long oldrows, oldcols, newrows, newcols, err;
 
    setcommandmode();
 
    err = (TerminalWindowSize(&oldrows, &oldcols) == 0) ? 1 : 0;
    switch(vfork()) {
    case -1:
        perror("Fork failed\n");
        break;
 
    case 0:
        {
            /*
             * Fire up the shell in the child.
             */
            register char *shellp, *shellname;
            extern char *rindex();
 
            shellp = getenv("SHELL");
            if (shellp == NULL)
                shellp = "/bin/sh";
            if ((shellname = rindex(shellp, '/')) == 0)
                shellname = shellp;
            else
                shellname++;
            if (argc > 1)
                execl(shellp, shellname, "-c", &saveline[1], 0);
            else
                execl(shellp, shellname, 0);
            perror("Execl");
            _exit(1);
        }
    default:
            (void)wait((int *)0);        /* Wait for the shell to complete */
 
            if (TerminalWindowSize(&newrows, &newcols) && connected &&
                (err || ((oldrows != newrows) || (oldcols != newcols)))) {
                    sendnaws();
            }
            break;
    }
    return 1;
}
#else   /* !defined(TN3270) */
extern int shell();
#endif  /* !defined(TN3270) */
 
/*VARARGS*/
        int
logout()
{
        send_do(TELOPT_LOGOUT, 1);
        (void) netflush();
        return 1;
}
 
 
/*
 * The SLC command.
 */
 
struct slclist {
        char    *name;
        char    *help;
        void    (*handler)();
        int     arg;
};
 
static void slc_help();
 
struct slclist SlcList[] = {
    { "export", "Use local special character definitions",
                                                slc_mode_export,        0 },
    { "import", "Use remote special character definitions",
                                                slc_mode_import,        1 },
    { "check",  "Verify remote special character definitions",
                                                slc_mode_import,        0 },
    { "help",   0,                               slc_help,               0 },
    { "?",      "Print help information",       slc_help,               0 },
    { 0 },
};
 
    static void
slc_help()
{
    struct slclist *c;
 
    for (c = SlcList; c->name; c++) {
        if (c->help) {
            if (*c->help)
                printf("%-15s %s\n", c->name, c->help);
            else
                printf("\n");
        }
    }
}
 
    static struct slclist *
getslc(name)
    char *name;
{
    return (struct slclist *)
                genget(name, (char **) SlcList, sizeof(struct slclist));
}
 
    static
slccmd(argc, argv)
    int  argc;
    char *argv[];
{
    struct slclist *c;
 
    if (argc != 2) {
        fprintf(stderr,
            "Need an argument to 'slc' command.  'slc ?' for help.\n");
        return 0;
    }
    c = getslc(argv[1]);
    if (c == 0) {
        fprintf(stderr, "'%s': unknown argument ('slc ?' for help).\n",
                                argv[1]);
        return 0;
    }
    if (Ambiguous(c)) {
        fprintf(stderr, "'%s': ambiguous argument ('slc ?' for help).\n",
                                argv[1]);
        return 0;
    }
    (*c->handler)(c->arg);
    slcstate();
    return 1;
}
 
/*
 * The ENVIRON command.
 */
 
struct envlist {
        char    *name;
        char    *help;
        void    (*handler)();
        int     narg;
};
 
extern struct env_lst *
        env_define P((unsigned char *, unsigned char *));
extern void
        env_undefine P((unsigned char *)),
        env_export P((unsigned char *)),
        env_unexport P((unsigned char *)),
        env_send P((unsigned char *)),
#if defined(OLD_ENVIRON) && defined(ENV_HACK)
        env_varval P((unsigned char *)),
#endif
        env_list P((void));
static void
        env_help P((void));
 
struct envlist EnvList[] = {
    { "define", "Define an environment variable",
                                                (void (*)())env_define, 2 },
    { "undefine", "Undefine an environment variable",
                                                env_undefine,   1 },
    { "export", "Mark an environment variable for automatic export",
                                                env_export,     1 },
    { "unexport", "Don't mark an environment variable for automatic export",
                                                env_unexport,   1 },
    { "send",   "Send an environment variable", env_send,       1 },
    { "list",   "List the current environment variables",
                                                env_list,       0 },
#if defined(OLD_ENVIRON) && defined(ENV_HACK)
    { "varval", "Reverse VAR and VALUE (auto, right, wrong, status)",
                                                env_varval,    1 },
#endif
    { "help",   0,                               env_help,               0 },
    { "?",      "Print help information",       env_help,               0 },
    { 0 },
};
 
    static void
env_help()
{
    struct envlist *c;
 
    for (c = EnvList; c->name; c++) {
        if (c->help) {
            if (*c->help)
                printf("%-15s %s\n", c->name, c->help);
            else
                printf("\n");
        }
    }
}
 
    static struct envlist *
getenvcmd(name)
    char *name;
{
    return (struct envlist *)
                genget(name, (char **) EnvList, sizeof(struct envlist));
}
 
env_cmd(argc, argv)
    int  argc;
    char *argv[];
{
    struct envlist *c;
 
    if (argc < 2) {
        fprintf(stderr,
            "Need an argument to 'environ' command.  'environ ?' for help.\n");
        return 0;
    }
    c = getenvcmd(argv[1]);
    if (c == 0) {
        fprintf(stderr, "'%s': unknown argument ('environ ?' for help).\n",
                                argv[1]);
        return 0;
    }
    if (Ambiguous(c)) {
        fprintf(stderr, "'%s': ambiguous argument ('environ ?' for help).\n",
                                argv[1]);
        return 0;
    }
    if (c->narg + 2 != argc) {
        fprintf(stderr,
            "Need %s%d argument%s to 'environ %s' command.  'environ ?' for help.\n",
                c->narg < argc + 2 ? "only " : "",
                c->narg, c->narg == 1 ? "" : "s", c->name);
        return 0;
    }
    (*c->handler)(argv[2], argv[3]);
    return 1;
}
 
struct env_lst {
        struct env_lst *next;   /* pointer to next structure */
        struct env_lst *prev;   /* pointer to previous structure */
        unsigned char *var;     /* pointer to variable name */
        unsigned char *value;   /* pointer to variable value */
        int export;             /* 1 -> export with default list of variables */
        int welldefined;        /* A well defined variable */
};
 
struct env_lst envlisthead;
 
        struct env_lst *
env_find(var)
        unsigned char *var;
{
        register struct env_lst *ep;
 
        for (ep = envlisthead.next; ep; ep = ep->next) {
                if (strcmp((char *)ep->var, (char *)var) == 0)
                        return(ep);
        }
        return(NULL);
}
 
        void
env_init()
{
        extern char **environ;
        register char **epp, *cp;
        register struct env_lst *ep;
        extern char *index();
 
        for (epp = environ; *epp; epp++) {
                if (cp = index(*epp, '=')) {
                        *cp = '\0';
                        ep = env_define((unsigned char *)*epp,
                                        (unsigned char *)cp+1);
                        ep->export = 0;
                        *cp = '=';
                }
        }
        /*
         * Special case for DISPLAY variable.  If it is ":0.0" or
         * "unix:0.0", we have to get rid of "unix" and insert our
         * hostname.
         */
        if ((ep = env_find("DISPLAY"))
            && ((*ep->value == ':')
                || (strncmp((char *)ep->value, "unix:", 5) == 0))) {
                char hbuf[256+1];
                char *cp2 = index((char *)ep->value, ':');
 
                gethostname(hbuf, 256);
                hbuf[256] = '\0';
                cp = (char *)malloc(strlen(hbuf) + strlen(cp2) + 1);
                sprintf((char *)cp, "%s%s", hbuf, cp2);
                free(ep->value);
                ep->value = (unsigned char *)cp;
        }
        /*
         * If USER is not defined, but LOGNAME is, then add
         * USER with the value from LOGNAME.  By default, we
         * don't export the USER variable.
         */
        if ((env_find("USER") == NULL) && (ep = env_find("LOGNAME"))) {
                env_define((unsigned char *)"USER", ep->value);
                env_unexport((unsigned char *)"USER");
        }
        env_export((unsigned char *)"DISPLAY");
        env_export((unsigned char *)"PRINTER");
}
 
        struct env_lst *
env_define(var, value)
        unsigned char *var, *value;
{
        register struct env_lst *ep;
 
        if (ep = env_find(var)) {
                if (ep->var)
                        free(ep->var);
                if (ep->value)
                        free(ep->value);
        } else {
                ep = (struct env_lst *)malloc(sizeof(struct env_lst));
                ep->next = envlisthead.next;
                envlisthead.next = ep;
                ep->prev = &envlisthead;
                if (ep->next)
                        ep->next->prev = ep;
        }
        ep->welldefined = opt_welldefined(var);
        ep->export = 1;
        ep->var = (unsigned char *)strdup((char *)var);
        ep->value = (unsigned char *)strdup((char *)value);
        return(ep);
}
 
        void
env_undefine(var)
        unsigned char *var;
{
        register struct env_lst *ep;
 
        if (ep = env_find(var)) {
                ep->prev->next = ep->next;
                if (ep->next)
                        ep->next->prev = ep->prev;
                if (ep->var)
                        free(ep->var);
                if (ep->value)
                        free(ep->value);
                free(ep);
        }
}
 
        void
env_export(var)
        unsigned char *var;
{
        register struct env_lst *ep;
 
        if (ep = env_find(var))
                ep->export = 1;
}
 
        void
env_unexport(var)
        unsigned char *var;
{
        register struct env_lst *ep;
 
        if (ep = env_find(var))
                ep->export = 0;
}
 
        void
env_send(var)
        unsigned char *var;
{
        register struct env_lst *ep;
 
        if (my_state_is_wont(TELOPT_NEW_ENVIRON)
#ifdef  OLD_ENVIRON
            && my_state_is_wont(TELOPT_OLD_ENVIRON)
#endif
                ) {
                fprintf(stderr,
                    "Cannot send '%s': Telnet ENVIRON option not enabled\n",
                                                                        var);
                return;
        }
        ep = env_find(var);
        if (ep == 0) {
                fprintf(stderr, "Cannot send '%s': variable not defined\n",
                                                                        var);
                return;
        }
        env_opt_start_info();
        env_opt_add(ep->var);
        env_opt_end(0);
}
 
        void
env_list()
{
        register struct env_lst *ep;
 
        for (ep = envlisthead.next; ep; ep = ep->next) {
                printf("%c %-20s %s\n", ep->export ? '*' : ' ',
                                        ep->var, ep->value);
        }
}
 
        unsigned char *
env_default(init, welldefined)
        int init;
{
        static struct env_lst *nep = NULL;
 
        if (init) {
                nep = &envlisthead;
                return;
        }
        if (nep) {
                while (nep = nep->next) {
                        if (nep->export && (nep->welldefined == welldefined))
                                return(nep->var);
                }
        }
        return(NULL);
}
 
        unsigned char *
env_getvalue(var)
        unsigned char *var;
{
        register struct env_lst *ep;
 
        if (ep = env_find(var))
                return(ep->value);
        return(NULL);
}
 
#if defined(OLD_ENVIRON) && defined(ENV_HACK)
        void
env_varval(what)
        unsigned char *what;
{
        extern int old_env_var, old_env_value, env_auto;
        int len = strlen((char *)what);
 
        if (len == 0)
                goto unknown;
 
        if (strncasecmp((char *)what, "status", len) == 0) {
                if (env_auto)
                        printf("%s%s", "VAR and VALUE are/will be ",
                                        "determined automatically\n");
                if (old_env_var == OLD_ENV_VAR)
                        printf("VAR and VALUE set to correct definitions\n");
                else
                        printf("VAR and VALUE definitions are reversed\n");
        } else if (strncasecmp((char *)what, "auto", len) == 0) {
                env_auto = 1;
                old_env_var = OLD_ENV_VALUE;
                old_env_value = OLD_ENV_VAR;
        } else if (strncasecmp((char *)what, "right", len) == 0) {
                env_auto = 0;
                old_env_var = OLD_ENV_VAR;
                old_env_value = OLD_ENV_VALUE;
        } else if (strncasecmp((char *)what, "wrong", len) == 0) {
                env_auto = 0;
                old_env_var = OLD_ENV_VALUE;
                old_env_value = OLD_ENV_VAR;
        } else {
unknown:
                printf("Unknown \"varval\" command. (\"auto\", \"right\", \"wrong\", \"status\")\n");
        }
}
#endif
 
#if     defined(AUTHENTICATION)
/*
 * The AUTHENTICATE command.
 */
 
struct authlist {
        char    *name;
        char    *help;
        int     (*handler)();
        int     narg;
};
 
extern int
        auth_enable P((int)),
        auth_disable P((int)),
        auth_status P((void));
static int
        auth_help P((void));
 
struct authlist AuthList[] = {
    { "status", "Display current status of authentication information",
                                                auth_status,    0 },
    { "disable", "Disable an authentication type ('auth disable ?' for more)",
                                                auth_disable,   1 },
    { "enable", "Enable an authentication type ('auth enable ?' for more)",
                                                auth_enable,    1 },
    { "help",   0,                               auth_help,              0 },
    { "?",      "Print help information",       auth_help,              0 },
    { 0 },
};
 
    static int
auth_help()
{
    struct authlist *c;
 
    for (c = AuthList; c->name; c++) {
        if (c->help) {
            if (*c->help)
                printf("%-15s %s\n", c->name, c->help);
            else
                printf("\n");
        }
    }
    return 0;
}
 
auth_cmd(argc, argv)
    int  argc;
    char *argv[];
{
    struct authlist *c;
 
    c = (struct authlist *)
                genget(argv[1], (char **) AuthList, sizeof(struct authlist));
    if (c == 0) {
        fprintf(stderr, "'%s': unknown argument ('auth ?' for help).\n",
                                argv[1]);
        return 0;
    }
    if (Ambiguous(c)) {
        fprintf(stderr, "'%s': ambiguous argument ('auth ?' for help).\n",
                                argv[1]);
        return 0;
    }
    if (c->narg + 2 != argc) {
        fprintf(stderr,
            "Need %s%d argument%s to 'auth %s' command.  'auth ?' for help.\n",
                c->narg < argc + 2 ? "only " : "",
                c->narg, c->narg == 1 ? "" : "s", c->name);
        return 0;
    }
    return((*c->handler)(argv[2], argv[3]));
}
#endif
 
 
#if     defined(unix) && defined(TN3270)
    static void
filestuff(fd)
    int fd;
{
    int res;
 
#ifdef  F_GETOWN
    setconnmode(0);
    res = fcntl(fd, F_GETOWN, 0);
    setcommandmode();
 
    if (res == -1) {
        perror("fcntl");
        return;
    }
    printf("\tOwner is %d.\n", res);
#endif
 
    setconnmode(0);
    res = fcntl(fd, F_GETFL, 0);
    setcommandmode();
 
    if (res == -1) {
        perror("fcntl");
        return;
    }
#ifdef notdef
    printf("\tFlags are 0x%x: %s\n", res, decodeflags(res));
#endif
}
#endif /* defined(unix) && defined(TN3270) */
 
/*
 * Print status about the connection.
 */
    /*ARGSUSED*/
    static
status(argc, argv)
    int  argc;
    char *argv[];
{
    if (connected) {
        printf("Connected to %s.\n", hostname);
        if ((argc < 2) || strcmp(argv[1], "notmuch")) {
            int mode = getconnmode();
 
            if (my_want_state_is_will(TELOPT_LINEMODE)) {
                printf("Operating with LINEMODE option\n");
                printf("%s line editing\n", (mode&MODE_EDIT) ? "Local" : "No");
                printf("%s catching of signals\n",
                                        (mode&MODE_TRAPSIG) ? "Local" : "No");
                slcstate();
#ifdef  KLUDGELINEMODE
            } else if (kludgelinemode && my_want_state_is_dont(TELOPT_SGA)) {
                printf("Operating in obsolete linemode\n");
#endif
            } else {
                printf("Operating in single character mode\n");
                if (localchars)
                    printf("Catching signals locally\n");
            }
            printf("%s character echo\n", (mode&MODE_ECHO) ? "Local" : "Remote");
            if (my_want_state_is_will(TELOPT_LFLOW))
                printf("%s flow control\n", (mode&MODE_FLOW) ? "Local" : "No");
        }
    } else {
        printf("No connection.\n");
    }
#   if !defined(TN3270)
    printf("Escape character is '%s'.\n", control(escape));
    (void) fflush(stdout);
#   else /* !defined(TN3270) */
    if ((!In3270) && ((argc < 2) || strcmp(argv[1], "notmuch"))) {
        printf("Escape character is '%s'.\n", control(escape));
    }
#   if defined(unix)
    if ((argc >= 2) && !strcmp(argv[1], "everything")) {
        printf("SIGIO received %d time%s.\n",
                                sigiocount, (sigiocount == 1)? "":"s");
        if (In3270) {
            printf("Process ID %d, process group %d.\n",
                                            getpid(), getpgrp(getpid()));
            printf("Terminal input:\n");
            filestuff(tin);
            printf("Terminal output:\n");
            filestuff(tout);
            printf("Network socket:\n");
            filestuff(net);
        }
    }
    if (In3270 && transcom) {
       printf("Transparent mode command is '%s'.\n", transcom);
    }
#   endif /* defined(unix) */
    (void) fflush(stdout);
    if (In3270) {
        return 0;
    }
#   endif /* defined(TN3270) */
    return 1;
}
 
#ifdef  SIGINFO
/*
 * Function that gets called when SIGINFO is received.
 */
ayt_status()
{
    (void) call(status, "status", "notmuch", 0);
}
#endif
 
int
tn(argc, argv)
    int argc;
    char *argv[];
{
    register struct hostent *host = 0;
    struct sockaddr_in sin;
    struct servent *sp = 0;
    unsigned long temp;
#if     defined(IP_OPTIONS) && defined(IPPROTO_IP)
    char *srp = 0, *strrchr();
    unsigned long sourceroute(), srlen;
#endif
    char *cmd, *hostp = 0, *portp = 0, *user = 0;
 
    /* clear the socket address prior to use */
    bzero((char *)&sin, sizeof(sin));
 
    if (connected) {
        printf("?Already connected to %s\n", hostname);
        setuid(getuid());
        return 0;
    }
    if (argc < 2) {
        (void) strcpy(line, "open ");
        printf("(to) ");
        (void) fgets(&line[strlen(line)], sizeof(line) - strlen(line), stdin);
        makeargv();
        argc = margc;
        argv = margv;
    }
    cmd = *argv;
    --argc; ++argv;
    while (argc) {
        if (isprefix(*argv, "help") || isprefix(*argv, "?"))
            goto usage;
        if (strcmp(*argv, "-l") == 0) {
            --argc; ++argv;
            if (argc == 0)
                goto usage;
            user = *argv++;
            --argc;
            continue;
        }
        if (strcmp(*argv, "-a") == 0) {
            --argc; ++argv;
            autologin = 1;
            continue;
        }
        if (hostp == 0) {
            hostp = *argv++;
            --argc;
            continue;
        }
        if (portp == 0) {
            portp = *argv++;
            --argc;
            continue;
        }
    usage:
        printf("usage: telnet [-l user] [-a] host-name [port]\n");
        setuid(getuid());
        return 0;
    }
    if (hostp == 0)
        goto usage;
 
#if     defined(IP_OPTIONS) && defined(IPPROTO_IP)
    if (hostp[0] == '@' || hostp[0] == '!') {
        if ((hostname = strrchr(hostp, ':')) == NULL)
            hostname = strrchr(hostp, '@');
        hostname++;
        srp = 0;
        temp = sourceroute(hostp, &srp, &srlen);
        if (temp == 0) {
#ifdef EMBED
            printf("ERROR: srp=%x\n", srp);
            printf("ERROR: srp=%s\n", srp);
#else
            herror(srp);
#endif
            setuid(getuid());
            return 0;
        } else if (temp == -1) {
            printf("Bad source route option: %s\n", hostp);
            setuid(getuid());
            return 0;
        } else {
            sin.sin_addr.s_addr = temp;
            sin.sin_family = AF_INET;
        }
    } else {
#endif
        temp = inet_addr(hostp);
        if (temp != INADDR_NONE) {
            sin.sin_addr.s_addr = temp;
            sin.sin_family = AF_INET;
            if (doaddrlookup)
                host = gethostbyaddr((char *)&temp, sizeof(temp), AF_INET);
            if (host)
                (void) strncpy(_hostname, host->h_name, sizeof(_hostname));
            else
                (void) strncpy(_hostname, hostp, sizeof(_hostname));
            _hostname[sizeof(_hostname)-1] = '\0';
            hostname = _hostname;
        } else {
            host = gethostbyname(hostp);
            if (host) {
                sin.sin_family = host->h_addrtype;
#if     defined(h_addr)         /* In 4.3, this is a #define */
                memmove((caddr_t)&sin.sin_addr,
                                host->h_addr_list[0],
                                MIN(host->h_length, sizeof(sin.sin_addr)));
#else   /* defined(h_addr) */
                memmove((caddr_t)&sin.sin_addr, host->h_addr,
                                MIN(host->h_length, sizeof(sin.sin_addr)));
#endif  /* defined(h_addr) */
                strncpy(_hostname, host->h_name, sizeof(_hostname));
                _hostname[sizeof(_hostname)-1] = '\0';
                hostname = _hostname;
            } else {
#ifdef EMBED
                printf("ERROR: hostp=%x\n", hostp);
                printf("ERROR: hostp=%s\n", hostp);
#else
                herror(hostp);
#endif
                setuid(getuid());
                return 0;
            }
        }
#if     defined(IP_OPTIONS) && defined(IPPROTO_IP)
    }
#endif
    if (portp) {
        if (*portp == '-') {
            portp++;
            telnetport = 1;
        } else
            telnetport = 0;
        sin.sin_port = atoi(portp);
        if (sin.sin_port == 0) {
            sp = getservbyname(portp, "tcp");
            if (sp)
                sin.sin_port = sp->s_port;
            else {
                printf("%s: bad port number\n", portp);
                setuid(getuid());
                return 0;
            }
        } else {
#if     !defined(htons)
            u_short htons P((unsigned short));
#endif  /* !defined(htons) */
            sin.sin_port = htons(sin.sin_port);
        }
    } else {
        if (sp == 0) {
            sp = getservbyname("telnet", "tcp");
            if (sp == 0) {
                fprintf(stderr, "telnet: tcp/telnet: unknown service\n");
                setuid(getuid());
                return 0;
            }
            sin.sin_port = sp->s_port;
        }
        telnetport = 1;
    }
    printf("Trying %s(%d)...\n", inet_ntoa(sin.sin_addr), sin.sin_port);
    do {
        net = socket(AF_INET, SOCK_STREAM, 0);
        setuid(getuid());
        if (net < 0) {
            perror("telnet: socket");
            return 0;
        }
#if     defined(IP_OPTIONS) && defined(IPPROTO_IP)
        if (srp && setsockopt(net, IPPROTO_IP, IP_OPTIONS, (char *)srp, srlen) < 0)
                perror("setsockopt (IP_OPTIONS)");
#endif
#if     defined(IPPROTO_IP) && defined(IP_TOS)
        {
# if    defined(HAS_GETTOS)
            struct tosent *tp;
            if (tos < 0 && (tp = gettosbyname("telnet", "tcp")))
                tos = tp->t_tos;
# endif
            if (tos < 0)
                tos = IPTOS_LOWDELAY;
            if (tos
                && (setsockopt(net, IPPROTO_IP, IP_TOS,
                    (char *)&tos, sizeof(int)) < 0)
                && (errno != ENOPROTOOPT))
                    perror("telnet: setsockopt (IP_TOS) (ignored)");
        }
#endif  /* defined(IPPROTO_IP) && defined(IP_TOS) */
 
        if (debug && SetSockOpt(net, SOL_SOCKET, SO_DEBUG, 1) < 0) {
                perror("setsockopt (SO_DEBUG)");
        }
 
        if (connect(net, (struct sockaddr *)&sin, sizeof (sin)) < 0) {
#if     defined(h_addr)         /* In 4.3, this is a #define */
            if (host && host->h_addr_list[1]) {
                int oerrno = errno;
 
                fprintf(stderr, "telnet: connect to address %s: ",
                                                inet_ntoa(sin.sin_addr));
                errno = oerrno;
                perror((char *)0);
                host->h_addr_list++;
                memcpy((caddr_t)&sin.sin_addr, host->h_addr_list[0],
                                MIN(host->h_length, sizeof(sin.sin_addr)));
                (void) NetClose(net);
                continue;
            }
#endif  /* defined(h_addr) */
            perror("telnet: Unable to connect to remote host");
            return 0;
        }
        connected++;
#if     defined(AUTHENTICATION)
        auth_encrypt_connect(connected);
#endif  /* defined(AUTHENTICATION) */
    } while (connected == 0);
    cmdrc(hostp, hostname);
    if (autologin && user == NULL) {
        struct passwd *pw;
 
        user = getenv("USER");
        if (user == NULL ||
            (pw = getpwnam(user)) && pw->pw_uid != getuid()) {
                if (pw = getpwuid(getuid()))
                        user = pw->pw_name;
                else
                        user = NULL;
        }
    }
    if (user) {
        env_define((unsigned char *)"USER", (unsigned char *)user);
        env_export((unsigned char *)"USER");
    }
    (void) call(status, "status", "notmuch", 0);
#ifndef EMBED
    if (setjmp(peerdied) == 0)
#endif
        telnet(user);
    (void) NetClose(net);
    ExitString("Connection closed by foreign host.\n",1);
    /*NOTREACHED*/
}
 
#define HELPINDENT (sizeof ("connect"))
 
static char
        openhelp[] =    "connect to a site",
        closehelp[] =   "close current connection",
        logouthelp[] =  "forcibly logout remote user and close the connection",
        quithelp[] =    "exit telnet",
        statushelp[] =  "print status information",
        helphelp[] =    "print help information",
        sendhelp[] =    "transmit special characters ('send ?' for more)",
        sethelp[] =     "set operating parameters ('set ?' for more)",
        unsethelp[] =   "unset operating parameters ('unset ?' for more)",
        togglestring[] ="toggle operating parameters ('toggle ?' for more)",
        slchelp[] =     "change state of special charaters ('slc ?' for more)",
        displayhelp[] = "display operating parameters",
#if     defined(TN3270) && defined(unix)
        transcomhelp[] = "specify Unix command for transparent mode pipe",
#endif  /* defined(TN3270) && defined(unix) */
#if     defined(AUTHENTICATION)
        authhelp[] =    "turn on (off) authentication ('auth ?' for more)",
#endif
#if     defined(unix)
        zhelp[] =       "suspend telnet",
#endif  /* defined(unix) */
#if     defined(SKEY)
        skeyhelp[] =    "compute response to s/key challenge",
#endif
        shellhelp[] =   "invoke a subshell",
        envhelp[] =     "change environment variables ('environ ?' for more)",
        modestring[] = "try to enter line or character mode ('mode ?' for more)";
 
static int      help();
 
static Command cmdtab[] = {
        { "close",      closehelp,      bye,            1 },
        { "logout",     logouthelp,     logout,         1 },
        { "display",    displayhelp,    display,        0 },
        { "mode",       modestring,     modecmd,        0 },
        { "telnet",     openhelp,       tn,             0 },
        { "open",       openhelp,       tn,             0 },
        { "quit",       quithelp,       quit,           0 },
        { "send",       sendhelp,       sendcmd,        0 },
        { "set",        sethelp,        setcmd,         0 },
        { "unset",      unsethelp,      unsetcmd,       0 },
        { "status",     statushelp,     status,         0 },
        { "toggle",     togglestring,   toggle,         0 },
        { "slc",        slchelp,        slccmd,         0 },
#if     defined(TN3270) && defined(unix)
        { "transcom",   transcomhelp,   settranscom,    0 },
#endif  /* defined(TN3270) && defined(unix) */
#if     defined(AUTHENTICATION)
        { "auth",       authhelp,       auth_cmd,       0 },
#endif
#if     defined(unix)
        { "z",          zhelp,          suspend,        0 },
#endif  /* defined(unix) */
#if     defined(TN3270)
        { "!",          shellhelp,      shell,          1 },
#else
        { "!",          shellhelp,      shell,          0 },
#endif
        { "environ",    envhelp,        env_cmd,        0 },
        { "?",          helphelp,       help,           0 },
#if     defined(SKEY)
        { "skey",       skeyhelp,       skey_calc,      0 },
#endif          
 
};
 
static char     crmodhelp[] =   "deprecated command -- use 'toggle crmod' instead";
static char     escapehelp[] =  "deprecated command -- use 'set escape' instead";
 
static Command cmdtab2[] = {
        { "help",       0,               help,           0 },
        { "escape",     escapehelp,     setescape,      0 },
        { "crmod",      crmodhelp,      togcrmod,       0 },
 
};
 
 
/*
 * Call routine with argc, argv set from args (terminated by 0).
 */
 
    /*VARARGS1*/
    static
/*call(va_alist)
    va_dcl
*/
int call(intrtn_t)
    int (*intrtn_t)();
{
    va_list ap;
    typedef int (*intrtn_t)();
    intrtn_t routine;
    char *args[100];
    int argno = 0;
 
    va_start(ap);
    routine = (va_arg(ap, intrtn_t));
    while ((args[argno++] = va_arg(ap, char *)) != 0) {
        ;
    }
    va_end(ap);
    return (*routine)(argno-1, args);
}
 
 
    static Command *
getcmd(name)
    char *name;
{
    Command *cm;
 
    if (cm = (Command *) genget(name, (char **) cmdtab, sizeof(Command)))
        return cm;
    return (Command *) genget(name, (char **) cmdtab2, sizeof(Command));
}
 
    void
command(top, tbuf, cnt)
    int top;
    char *tbuf;
    int cnt;
{
    register Command *c;
 
    setcommandmode();
    if (!top) {
        putchar('\n');
#if     defined(unix)
    } else {
        (void) signal(SIGINT, SIG_DFL);
        (void) signal(SIGQUIT, SIG_DFL);
#endif  /* defined(unix) */
    }
    for (;;) {
        if (rlogin == _POSIX_VDISABLE)
                printf("%s> ", prompt);
        if (tbuf) {
            register char *cp;
            cp = line;
            while (cnt > 0 && (*cp++ = *tbuf++) != '\n')
                cnt--;
            tbuf = 0;
            if (cp == line || *--cp != '\n' || cp == line)
                goto getline;
            *cp = '\0';
            if (rlogin == _POSIX_VDISABLE)
                printf("%s\n", line);
        } else {
        getline:
            if (rlogin != _POSIX_VDISABLE)
                printf("%s> ", prompt);
            if (fgets(line, sizeof(line), stdin) == NULL) {
                if (feof(stdin) || ferror(stdin)) {
                    (void) quit();
                    /*NOTREACHED*/
                }
                break;
            }
        }
        if (line[0] == 0)
            break;
        makeargv();
        if (margv[0] == 0) {
            break;
        }
        c = getcmd(margv[0]);
        if (Ambiguous(c)) {
            printf("?Ambiguous command\n");
            continue;
        }
        if (c == 0) {
            printf("?Invalid command\n");
            continue;
        }
        if (c->needconnect && !connected) {
            printf("?Need to be connected first.\n");
            continue;
        }
        if ((*c->handler)(margc, margv)) {
            break;
        }
    }
    if (!top) {
        if (!connected) {
#ifdef EMBED
            printf("ERROR: no longjmp()\n");
            exit(1);
#else
            longjmp(toplevel, 1);
#endif
            /*NOTREACHED*/
        }
#if     defined(TN3270)
        if (shell_active == 0) {
            setconnmode(0);
        }
#else   /* defined(TN3270) */
        setconnmode(0);
#endif  /* defined(TN3270) */
    }
}
 
/*
 * Help command.
 */
        static
help(argc, argv)
        int argc;
        char *argv[];
{
        register Command *c;
 
        if (argc == 1) {
                printf("Commands may be abbreviated.  Commands are:\n\n");
                for (c = cmdtab; c->name; c++)
                        if (c->help) {
                                printf("%-*s\t%s\n", HELPINDENT, c->name,
                                                                    c->help);
                        }
                return 0;
        }
        while (--argc > 0) {
                register char *arg;
                arg = *++argv;
                c = getcmd(arg);
                if (Ambiguous(c))
                        printf("?Ambiguous help command %s\n", arg);
                else if (c == (Command *)0)
                        printf("?Invalid help command %s\n", arg);
                else
                        printf("%s\n", c->help);
        }
        return 0;
}
 
static char *rcname = 0;
static char rcbuf[128];
 
        void
cmdrc(m1, m2)
        char *m1, *m2;
{
    register Command *c;
    FILE *rcfile;
    int gotmachine = 0;
    int l1 = strlen(m1);
    int l2 = strlen(m2);
    char m1save[64];
 
    if (skiprc)
        return;
 
    strcpy(m1save, m1);
    m1 = m1save;
 
    if (rcname == 0) {
        rcname = getenv("HOME");
        if (rcname && (strlen(rcname) + 10) < sizeof(rcbuf))
            strcpy(rcbuf, rcname);
        else
            rcbuf[0] = '\0';
        strcat(rcbuf, "/.telnetrc");
        rcname = rcbuf;
    }
 
    if ((rcfile = fopen(rcname, "r")) == 0) {
        return;
    }
 
    for (;;) {
        if (fgets(line, sizeof(line), rcfile) == NULL)
            break;
        if (line[0] == 0)
            break;
        if (line[0] == '#')
            continue;
        if (gotmachine) {
            if (!isspace(line[0]))
                gotmachine = 0;
        }
        if (gotmachine == 0) {
            if (isspace(line[0]))
                continue;
            if (strncasecmp(line, m1, l1) == 0)
                strncpy(line, &line[l1], sizeof(line) - l1);
            else if (strncasecmp(line, m2, l2) == 0)
                strncpy(line, &line[l2], sizeof(line) - l2);
            else if (strncasecmp(line, "DEFAULT", 7) == 0)
                strncpy(line, &line[7], sizeof(line) - 7);
            else
                continue;
            if (line[0] != ' ' && line[0] != '\t' && line[0] != '\n')
                continue;
            gotmachine = 1;
        }
        makeargv();
        if (margv[0] == 0)
            continue;
        c = getcmd(margv[0]);
        if (Ambiguous(c)) {
            printf("?Ambiguous command: %s\n", margv[0]);
            continue;
        }
        if (c == 0) {
            printf("?Invalid command: %s\n", margv[0]);
            continue;
        }
        /*
         * This should never happen...
         */
        if (c->needconnect && !connected) {
            printf("?Need to be connected first for %s.\n", margv[0]);
            continue;
        }
        (*c->handler)(margc, margv);
    }
    fclose(rcfile);
}
 
#if     defined(IP_OPTIONS) && defined(IPPROTO_IP)
 
/*
 * Source route is handed in as
 *      [!]@hop1@hop2...[@|:]dst
 * If the leading ! is present, it is a
 * strict source route, otherwise it is
 * assmed to be a loose source route.
 *
 * We fill in the source route option as
 *      hop1,hop2,hop3...dest
 * and return a pointer to hop1, which will
 * be the address to connect() to.
 *
 * Arguments:
 *      arg:    pointer to route list to decipher
 *
 *      cpp:    If *cpp is not equal to NULL, this is a
 *              pointer to a pointer to a character array
 *              that should be filled in with the option.
 *
 *      lenp:   pointer to an integer that contains the
 *              length of *cpp if *cpp != NULL.
 *
 * Return values:
 *
 *      Returns the address of the host to connect to.  If the
 *      return value is -1, there was a syntax error in the
 *      option, either unknown characters, or too many hosts.
 *      If the return value is 0, one of the hostnames in the
 *      path is unknown, and *cpp is set to point to the bad
 *      hostname.
 *
 *      *cpp:   If *cpp was equal to NULL, it will be filled
 *              in with a pointer to our static area that has
 *              the option filled in.  This will be 32bit aligned.
 *
 *      *lenp:  This will be filled in with how long the option
 *              pointed to by *cpp is.
 *
 */
        unsigned long
sourceroute(arg, cpp, lenp)
        char    *arg;
        char    **cpp;
        int     *lenp;
{
        static char lsr[44];
#ifdef  sysV88
        static IOPTN ipopt;
#endif
        char *cp, *cp2, *lsrp, *lsrep;
        register int tmp;
        struct in_addr sin_addr;
        register struct hostent *host = 0;
        register char c;
 
        /*
         * Verify the arguments, and make sure we have
         * at least 7 bytes for the option.
         */
        if (cpp == NULL || lenp == NULL)
                return((unsigned long)-1);
        if (*cpp != NULL && *lenp < 7)
                return((unsigned long)-1);
        /*
         * Decide whether we have a buffer passed to us,
         * or if we need to use our own static buffer.
         */
        if (*cpp) {
                lsrp = *cpp;
                lsrep = lsrp + *lenp;
        } else {
                *cpp = lsrp = lsr;
                lsrep = lsrp + 44;
        }
 
        cp = arg;
 
        /*
         * Next, decide whether we have a loose source
         * route or a strict source route, and fill in
         * the begining of the option.
         */
#ifndef sysV88
        if (*cp == '!') {
                cp++;
                *lsrp++ = IPOPT_SSRR;
        } else
                *lsrp++ = IPOPT_LSRR;
#else
        if (*cp == '!') {
                cp++;
                ipopt.io_type = IPOPT_SSRR;
        } else
                ipopt.io_type = IPOPT_LSRR;
#endif
 
        if (*cp != '@')
                return((unsigned long)-1);
 
#ifndef sysV88
        lsrp++;         /* skip over length, we'll fill it in later */
        *lsrp++ = 4;
#endif
 
        cp++;
 
        sin_addr.s_addr = 0;
 
        for (c = 0;;) {
                if (c == ':')
                        cp2 = 0;
                else for (cp2 = cp; c = *cp2; cp2++) {
                        if (c == ',') {
                                *cp2++ = '\0';
                                if (*cp2 == '@')
                                        cp2++;
                        } else if (c == '@') {
                                *cp2++ = '\0';
                        } else if (c == ':') {
                                *cp2++ = '\0';
                        } else
                                continue;
                        break;
                }
                if (!c)
                        cp2 = 0;
 
                if ((tmp = inet_addr(cp)) != -1) {
                        sin_addr.s_addr = tmp;
                } else if (host = gethostbyname(cp)) {
#if     defined(h_addr)
                        memcpy((caddr_t)&sin_addr, host->h_addr_list[0],
                                        MIN(host->h_length,sizeof(sin_addr)));
#else
                        memcpy((caddr_t)&sin_addr, host->h_addr,
                                        MIN(host->h_length,sizeof(sin_addr)));
#endif
                } else {
                        *cpp = cp;
                        return(0);
                }
                memcpy(lsrp, (char *)&sin_addr, 4);
                lsrp += 4;
                if (cp2)
                        cp = cp2;
                else
                        break;
                /*
                 * Check to make sure there is space for next address
                 */
                if (lsrp + 4 > lsrep)
                        return((unsigned long)-1);
        }
#ifndef sysV88
        if ((*(*cpp+IPOPT_OLEN) = lsrp - *cpp) <= 7) {
                *cpp = 0;
                *lenp = 0;
                return((unsigned long)-1);
        }
        *lsrp++ = IPOPT_NOP; /* 32 bit word align it */
        *lenp = lsrp - *cpp;
#else
        ipopt.io_len = lsrp - *cpp;
        if (ipopt.io_len <= 5) {                /* Is 3 better ? */
                *cpp = 0;
                *lenp = 0;
                return((unsigned long)-1);
        }
        *lenp = sizeof(ipopt);
        *cpp = (char *) &ipopt;
#endif
        return(sin_addr.s_addr);
}
#endif
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[/] [or1k/] [trunk/] [uclinux/] [userland/] [telnet/] [commands.c] - Blame information for rev 1778

Line No.	Rev	Author	Line
1	763	simons	`/*`
2			`* Copyright (c) 1988, 1990, 1993`
3			`* The Regents of the University of California. All rights reserved.`
4			`*`
5			`* Redistribution and use in source and binary forms, with or without`
6			`* modification, are permitted provided that the following conditions`
7			`* are met:`
8			`* 1. Redistributions of source code must retain the above copyright`
9			`* notice, this list of conditions and the following disclaimer.`
10			`* 2. Redistributions in binary form must reproduce the above copyright`
11			`* notice, this list of conditions and the following disclaimer in the`
12			`* documentation and/or other materials provided with the distribution.`
13			`* 3. All advertising materials mentioning features or use of this software`
14			`* must display the following acknowledgement:`
15			`* This product includes software developed by the University of`
16			`* California, Berkeley and its contributors.`
17			`* 4. Neither the name of the University nor the names of its contributors`
18			`* may be used to endorse or promote products derived from this software`
19			`* without specific prior written permission.`
20			`*`
21			* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
22			`* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE`
23			`* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE`
24			`* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE`
25			`* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL`
26			`* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS`
27			`* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)`
28			`* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT`
29			`* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY`
30			`* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF`
31			`* SUCH DAMAGE.`
32			`*/`
33
34			`#ifndef lint`
35			`static char sccsid[] = "@(#)commands.c 8.2 (Berkeley) 12/15/93";`
36			`#endif /* not lint */`
37
38			`#if defined(unix)`
39			`#include <sys/param.h>`
40			`#if defined(CRAY) \|\| defined(sysV88)`