/*
 * 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.
 *
 * @(#) Copyright (c) 1992, 1993 The Regents of the University of California.  All rights reserved.
 * @(#)remote.c 8.1 (Berkeley) 6/6/93
 * $FreeBSD: src/usr.bin/tip/tip/remote.c,v 1.4 1999/08/28 01:06:35 peter Exp $
 */

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

#include "tip.h"
#include "pathnames.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, &LI, &LO
};

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

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

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

static void getremcap(char *);

/*
        Expand the start tilde sequence at the start of the
        specified path. Optionally, free space allocated to
        path before reinitializing it.
*/
static int
expand_tilde (char **path, void (*free) (char *p))
{
        int rc = 0;
        char buffer [PATH_MAX];
        char *tailp;
        if ((tailp = strchr (*path + 1, '/')) != NULL)
        {
                struct passwd *pwd;
                *tailp++ = '\0';
                if (*(*path + 1) == '\0')
                        strcpy (buffer, getlogin ());
                else
                        strcpy (buffer, *path + 1);
                if ((pwd = getpwnam (buffer)) != NULL)
                {
                        strcpy (buffer, pwd->pw_dir);
                        strcat (buffer, "/");
                        strcat (buffer, tailp);
                        if (free)
                                free (*path);
                        *path = strdup (buffer);
                        rc++;
                }
                return rc;
        }
        return (-1);
}

static void
getremcap(char *host)
{
        char **p, ***q;
        char *bp;
        char *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 ||
                    (host[0] == '/' && access(DV = host, R_OK | W_OK) == 0)) {
                        CU = DV;
                        HO = host;
                        HW = 1;
                        DU = 0;
                        if (!BR)
                                BR = DEFBR;
                        FS = BUFSIZ;
                        return;
                }
                switch(stat) {
                case -1:
                        warnx("unknown host %s", host);
                        break;
                case -2:
                        warnx("can't open host description file");
                        break;
                case -3:
                        warnx("possible reference loop in host description file");
                        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 (cgetnum(bp, "fs", &FS) == -1)
                FS = BUFSIZ;
        if (DU < 0)
                DU = 0;
        else
                DU = cgetflag("du");
        if (DV == NULL) {
                fprintf(stderr, "%s: missing device spec\n", host);
                exit(3);
        }
        if (DU && CU == NULL)
                CU = DV;
        if (DU && PN == NULL) {
                fprintf(stderr, "%s: missing phone number\n", host);
                exit(3);
        }

        HD = cgetflag("hd");

        /*
         * This effectively eliminates the "hw" attribute
         *   from the description file
         */
        if (!HW)
                HW = (CU == NULL) || (DU && equal(DV, CU));
        HO = host;

        /*
                If login script, verify access
        */
        if (LI != NULL) {
                if (*LI == '~')
                        (void) expand_tilde (&LI, NULL);
                if (access (LI, F_OK | X_OK) != 0) {
                        printf("tip (warning): can't open login script \"%s\"\n", LI);
                        LI = NULL;
                }
        }

        /*
                If logout script, verify access
        */
        if (LO != NULL) {
                if (*LO == '~')
                        (void) expand_tilde (&LO, NULL);
                if (access (LO, F_OK | X_OK) != 0) {
                        printf("tip (warning): can't open logout script \"%s\"\n", LO);
                        LO = NULL;
                }
        }

        /*
         * see if uppercase mode should be turned on initially
         */
        if (cgetflag("ra"))
                boolean(value(RAISE)) = 1;
        if (cgetflag("ec"))
                boolean(value(ECHOCHECK)) = 1;
        if (cgetflag("be"))
                boolean(value(BEAUTIFY)) = 1;
        if (cgetflag("nb"))
                boolean(value(BEAUTIFY)) = 0;
        if (cgetflag("sc"))
                boolean(value(SCRIPT)) = 1;
        if (cgetflag("tb"))
                boolean(value(TABEXPAND)) = 1;
        if (cgetflag("vb"))
                boolean(value(VERBOSE)) = 1;
        if (cgetflag("nv"))
                boolean(value(VERBOSE)) = 0;
        if (cgetflag("ta"))
                boolean(value(TAND)) = 1;
        if (cgetflag("nt"))
                boolean(value(TAND)) = 0;
        if (cgetflag("rw"))
                boolean(value(RAWFTP)) = 1;
        if (cgetflag("hd"))
                boolean(value(HALFDUPLEX)) = 1;
        if (RE == NULL)
                RE = (char *)"tip.record";
        if (EX == NULL)
                EX = (char *)"\t\n\b\f";
        if (ES != NULL)
                vstring("es", ES);
        if (FO != NULL)
                vstring("fo", FO);
        if (PR != NULL)
                vstring("pr", PR);
        if (RC != NULL)
                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 == NULL && (host = getenv("HOST")) == NULL)
                        errx(3, "no host specified");
                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 == NULL)
                return (NULL);
        if ((cp = index(next, ',')) == NULL) {
                DV = next;
                next = NULL;
        } else {
                *cp++ = '\0';
                DV = next;
                next = cp;
        }
        return (DV);
}