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dialup.c

/*
 * Copyright 1989 - 1991, 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>

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

#include <stdio.h>
#include "prototypes.h"
#include "defines.h"
#include "dialup.h"

static      FILE  *dialpwd;

void
setduent(void)
{
      if (dialpwd)
            rewind (dialpwd);
      else
            dialpwd = fopen (DIALPWD, "r");
}

void
endduent(void)
{
      if (dialpwd)
            fclose (dialpwd);

      dialpwd = (FILE *) 0;
}

struct dialup *
fgetduent(FILE *fp)
{
      static      struct      dialup      dialup;     /* static structure to point to */
      static      char  sh[128];    /* some space for a login shell */
      static      char  passwd[128];      /* some space for dialup password */
      char  buf[BUFSIZ];
      char  *cp;
      char  *cp2;

      if (! fp)
            return 0;

      if (! fp || feof (fp))
            return ((struct dialup *) 0);

      while (fgets (buf, sizeof buf, fp) == buf && buf[0] == '#')
            ;

      if (feof (fp))
            return ((struct dialup *) 0);

      if ((cp = strchr (buf, '\n')))
            *cp = '\0';

      if (! (cp = strchr (buf, ':')))
            return ((struct dialup *) 0);

      if (cp - buf > sizeof sh)     /* something is fishy ... */
            return ((struct dialup *) 0);

      *cp++ = '\0';
      (void) strcpy (sh, buf);
      sh[cp - buf] = '\0';

      if ((cp2 = strchr (cp, ':')))
            *cp2 = '\0';

      if (strlen (cp) + 1 > sizeof passwd) /* something is REALLY fishy */
            return ((struct dialup *) 0);

      (void) strcpy (passwd, cp);

      dialup.du_shell = sh;
      dialup.du_passwd = passwd;

      return (&dialup);
}

struct dialup *
getduent(void)
{
      if (! dialpwd)
            setduent ();

      return fgetduent (dialpwd);
}

struct dialup *
getdushell(const char *sh)
{
      struct      dialup      *dialup;

      while ((dialup = getduent ())) {
            if (strcmp (sh, dialup->du_shell) == 0)
                  return (dialup);

            if (strcmp (dialup->du_shell, "*") == 0)
                  return (dialup);
      }
      return ((struct dialup *) 0);
}

int
isadialup(const char *tty)
{
      FILE  *fp;
      char  buf[BUFSIZ];
      int   dialup = 0;

      if (! (fp = fopen (DIALUPS, "r")))
            return (0);

      while (fgets (buf, sizeof buf, fp) == buf) {
            if (buf[0] == '#')
                  continue;

            buf[strlen (buf) - 1] = '\0';

            if (strcmp (buf, tty) == 0) {
                  dialup = 1;
                  break;
            }
      }
      fclose (fp);

      return (dialup);
}

int
putduent(const struct dialup *dial, FILE *fp)
{
      if (! fp || ! dial)
            return -1;

      if (fprintf (fp, "%s:%s\n", dial->du_shell, dial->du_passwd) == EOF)
            return -1;

      return 0;
}

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