/*      $OpenBSD: remote.c,v 1.16 2006/06/06 23:24:52 deraadt Exp $     */
/*      $NetBSD: remote.c,v 1.5 1997/04/20 00:02:45 mellon Exp $        */

/*-
 * SPDX-License-Identifier: BSD-3-Clause
 *
 * Copyright (c) 1992, 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.
 */

#include <stdio.h>
#include <stdlib.h>

#include "pathnames.h"
#include "tip.h"

/*
 * Attributes to be gleened from remote host description
 *   data base.
 */
static char **caps[] = {
        &AT, &DV, &CM, &CU, &EL, &IE, &OE, &PN, &PR, &DI,
        &ES, &EX, &FO, &RC, &RE, &PA
};

static char *capstrings[] = {
        "at", "dv", "cm", "cu", "el", "ie", "oe", "pn", "pr",
        "di", "es", "ex", "fo", "rc", "re", "pa", 0
};

static char     *db_array[3] = { _PATH_REMOTE, 0, 0 };

#define cgetflag(f)     (cgetcap(bp, f, ':') != NULL)

static void     getremcap(char *);

static void
getremcap(char *host)
{
        char **p, ***q, *bp, *rempath;
        int   stat;

        rempath = getenv("REMOTE");
        if (rempath != NULL) {
                if (*rempath != '/')
                        /* we have an entry */
                        cgetset(rempath);
                else {  /* we have a path */
                        db_array[1] = rempath;
                        db_array[2] = _PATH_REMOTE;
                }
        }

        if ((stat = cgetent(&bp, db_array, host)) < 0) {
                if ((DV != NULL) ||
                    (host[0] == '/' && access(DV = host, R_OK | W_OK) == 0)) {
                        CU = DV;
                        HO = host;
                        HW = 1;
                        DU = 0;
                        if (!BR)
                                BR = DEFBR;
                        FS = DEFFS;
                        return;
                }
                switch (stat) {
                case -1:
                        fprintf(stderr, "%s: unknown host %s\n", __progname,
                            host);
                        break;
                case -2:
                        fprintf(stderr,
                            "%s: can't open host description file\n",
                            __progname);
                        break;
                case -3:
                        fprintf(stderr,
                            "%s: possible reference loop in host description file\n", __progname);
                        break;
                }
                exit(3);
        }

        for (p = capstrings, q = caps; *p != NULL; p++, q++)
                if (**q == NULL)
                        cgetstr(bp, *p, *q);
        if (!BR && (cgetnum(bp, "br", &BR) == -1))
                BR = DEFBR;
        if (!LD && (cgetnum(bp, "ld", &LD) == -1))
                LD = TTYDISC;
        if (cgetnum(bp, "fs", &FS) == -1)
                FS = DEFFS;
        if (DU < 0)
                DU = 0;
        else
                DU = cgetflag("du");
        if (DV == NOSTR) {
                fprintf(stderr, "%s: missing device spec\n", host);
                exit(3);
        }
        if (DU && CU == NOSTR)
                CU = DV;
        if (DU && PN == NOSTR) {
                fprintf(stderr, "%s: missing phone number\n", host);
                exit(3);
        }
        if (DU && AT == NOSTR) {
                fprintf(stderr, "%s: missing acu type\n", host);
                exit(3);
        }

        HD = cgetflag("hd");

        /*
         * This effectively eliminates the "hw" attribute
         *   from the description file
         */
        if (!HW)
                HW = (CU == NOSTR) || (DU && equal(DV, CU));
        HO = host;
        /*
         * see if uppercase mode should be turned on initially
         */
        if (cgetflag("ra"))
                setboolean(value(RAISE), 1);
        if (cgetflag("ec"))
                setboolean(value(ECHOCHECK), 1);
        if (cgetflag("be"))
                setboolean(value(BEAUTIFY), 1);
        if (cgetflag("nb"))
                setboolean(value(BEAUTIFY), 0);
        if (cgetflag("sc"))
                setboolean(value(SCRIPT), 1);
        if (cgetflag("tb"))
                setboolean(value(TABEXPAND), 1);
        if (cgetflag("vb"))
                setboolean(value(VERBOSE), 1);
        if (cgetflag("nv"))
                setboolean(value(VERBOSE), 0);
        if (cgetflag("ta"))
                setboolean(value(TAND), 1);
        if (cgetflag("nt"))
                setboolean(value(TAND), 0);
        if (cgetflag("rw"))
                setboolean(value(RAWFTP), 1);
        if (cgetflag("hd"))
                setboolean(value(HALFDUPLEX), 1);
        if (cgetflag("dc"))
                setboolean(value(DC), 1);
        if (cgetflag("hf"))
                setboolean(value(HARDWAREFLOW), 1);
        if (RE == NOSTR)
                RE = (char *)"tip.record";
        if (EX == NOSTR)
                EX = (char *)"\t\n\b\f";
        if (ES != NOSTR)
                vstring("es", ES);
        if (FO != NOSTR)
                vstring("fo", FO);
        if (PR != NOSTR)
                vstring("pr", PR);
        if (RC != NOSTR)
                vstring("rc", RC);
        if (cgetnum(bp, "dl", &DL) == -1)
                DL = 0;
        if (cgetnum(bp, "cl", &CL) == -1)
                CL = 0;
        if (cgetnum(bp, "et", &ET) == -1)
                ET = 10;
}

char *
getremote(char *host)
{
        char *cp;
        static char *next;
        static int lookedup = 0;

        if (!lookedup) {
                if (host == NOSTR && (host = getenv("HOST")) == NOSTR) {
                        fprintf(stderr, "%s: no host specified\n", __progname);
                        exit(3);
                }
                getremcap(host);
                next = DV;
                lookedup++;
        }
        /*
         * We return a new device each time we're called (to allow
         *   a rotary action to be simulated)
         */
        if (next == NOSTR)
                return (NOSTR);
        if ((cp = strchr(next, ',')) == NULL) {
                DV = next;
                next = NOSTR;
        } else {
                *cp++ = '\0';
                DV = next;
                next = cp;
        }
        return (DV);
}