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rlogin.c

/*
 * Copyright 1989 - 1994, Julianne Frances Haugh
 * 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 Julianne F. Haugh 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 JULIE HAUGH 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 JULIE HAUGH 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 <config.h>

#ifdef RLOGIN

#include "rcsid.h"
RCSID("$Id: rlogin.c 6 2005-03-20 15:34:28Z bubulle $")

#include "prototypes.h"
#include "defines.h"

#include <stdio.h>
#include <pwd.h>

extern int ruserok();

static struct {
      int   spd_name;
      int   spd_baud;
} speed_table [] = {
#ifdef B50
      { B50, 50 },
#endif
#ifdef B75
      { B75, 75 },
#endif
#ifdef B110
      { B110, 110 },
#endif
#ifdef B134
      { B134, 134 },
#endif
#ifdef B150
      { B150, 150 },
#endif
#ifdef B200
      { B200, 200 },
#endif
#ifdef B300
      { B300, 300 },
#endif
#ifdef B600
      { B600, 600 },
#endif
#ifdef B1200
      { B1200, 1200 },
#endif
#ifdef B1800
      { B1800, 1800 },
#endif
#ifdef B2400
      { B2400, 2400 },
#endif
#ifdef B4800
      { B4800, 4800 },
#endif
#ifdef B9600
      { B9600, 9600 },
#endif
#ifdef B19200
      { B19200, 19200 },
#endif
#ifdef B38400
      { B38400, 38400 },
#endif
      { -1, -1 }
};

static void
get_remote_string(char *buf, int size)
{
      for (;;) {
            if (read (0, buf, 1) != 1)
                  exit (1);
            if (*buf == '\0')
                  return;
            if (--size > 0)
                  ++buf;
      }
      /*NOTREACHED*/
}

int
do_rlogin(const char *remote_host, char *name, int namelen, char *term, int termlen)
{
      struct      passwd      *pwd;
      char  remote_name[32];
      char  *cp;
      int   remote_speed = 9600;
      int   speed_name = B9600;
      int   i;
      TERMIO      termio;

      get_remote_string (remote_name, sizeof remote_name);
      get_remote_string (name, namelen);
      get_remote_string (term, termlen);

      if ((cp = strchr (term, '/'))) {
            *cp++ = '\0';

            if (! (remote_speed = atoi (cp)))
                  remote_speed = 9600;
      }
      for (i = 0;speed_table[i].spd_baud != remote_speed &&
                        speed_table[i].spd_name != -1;i++)
            ;

      if (speed_table[i].spd_name != -1)
            speed_name = speed_table[i].spd_name;

      /*
       * Put the terminal in cooked mode with echo turned on.
       */

      GTTY(0, &termio);
      termio.c_iflag |= ICRNL|IXON;
      termio.c_oflag |= OPOST|ONLCR;
      termio.c_lflag |= ICANON|ECHO|ECHOE;
#ifdef CBAUD
      termio.c_cflag = (termio.c_cflag & ~CBAUD) | speed_name;
#else
      termio.c_cflag = (termio.c_cflag) | speed_name;
#endif
      STTY(0, &termio);

      if (! (pwd = getpwnam (name)))
            return 0;

      /*
       * ruserok() returns 0 for success on modern systems, and 1 on
       * older ones.  If you are having trouble with people logging
       * in without giving a required password, THIS is the culprit -
       * go fix the #define in config.h.
       */

#ifndef     RUSEROK
      return 0;
#else
      return ruserok (remote_host, pwd->pw_uid == 0,
                        remote_name, name) == RUSEROK;
#endif
}
#endif /* RLOGIN */

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