regress/lib/libc/pty/ptm/ptm.c

   1 /*      $NetBSD: ptm.c,v 1.4 2004/11/11 15:58:59 christos Exp $ */
   2
   3 /*-
   4  * Copyright (c) 2004 The NetBSD Foundation, Inc.
   5  * All rights reserved.
   6  *
   7  * This code is derived from software contributed to The NetBSD Foundation
   8  * by Christos Zoulas.
   9  *
  10  * Redistribution and use in source and binary forms, with or without
  11  * modification, are permitted provided that the following conditions
  12  * are met:
  13  * 1. Redistributions of source code must retain the above copyright
  14  *    notice, this list of conditions and the following disclaimer.
  15  * 2. Redistributions in binary form must reproduce the above copyright
  16  *    notice, this list of conditions and the following disclaimer in the
  17  *    documentation and/or other materials provided with the distribution.
  18  *
  19  * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
  20  * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
  21  * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
  22  * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
  23  * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
  24  * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
  25  * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
  26  * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
  27  * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
  28  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
  29  * POSSIBILITY OF SUCH DAMAGE.
  30  */
  31 #include <sys/cdefs.h>
  32 __RCSID("$NetBSD: ptm.c,v 1.4 2004/11/11 15:58:59 christos Exp $");
  33
  34 #include <stdlib.h>
  35 #include <unistd.h>
  36 #include <grp.h>
  37 #include <fcntl.h>
  38 #include <errno.h>
  39 #include <sys/stat.h>
  40 #include <sys/ioctl.h>
  41
  42 int
  43 main(int argc, char *argv[])
  44 {
  45         struct stat stm, sts;
  46         struct ptmget ptm;
  47         char *pty;
  48         int fdm, fds;
  49         struct group *gp;
  50
  51         if ((fdm = open("/dev/ptm", O_RDWR)) == -1) {
  52                 if (errno == ENOENT || errno == ENODEV)
  53                         return 0;
  54                 err(1, "open multiplexor");
  55         }
  56
  57         if (fstat(fdm, &stm) == -1)
  58                 err(1, "fstat multiplexor");
  59
  60         if (major(stm.st_rdev) != 165)
  61                 errx(1, "bad multiplexor major number %d", major(stm.st_rdev));
  62
  63         if (ioctl(fdm, TIOCPTMGET, &ptm) == -1)
  64                 err(1, "ioctl(TIOCPTMGET)");
  65
  66         if (strncmp(ptm.cn, "/dev/pty", 8) != 0)
  67                 if (strncmp(ptm.cn, "/dev/null", 9) != 0)
  68                         errx(1, "bad master name %s", ptm.cn);
  69
  70         if (strncmp(ptm.sn, "/dev/tty", 8) != 0)
  71                 if (strncmp(ptm.sn, "/dev/pts/", 9) != 0)
  72                         errx(1, "bad slave name %s", ptm.sn);
  73
  74         if (strncmp(ptm.cn, "/dev/null", 9) != 0) {
  75                 if (fstat(ptm.cfd, &stm) == -1)
  76                         err(1, "fstat master");
  77                 if (stat(ptm.cn, &sts) == -1)
  78                         err(1, "stat master");
  79                 if (stm.st_rdev != sts.st_rdev)
  80                         errx(1, "master device mismatch %lu != %lu",
  81                             (unsigned long)stm.st_rdev,
  82                             (unsigned long)sts.st_rdev);
  83         }
  84
  85         if (fstat(ptm.sfd, &stm) == -1)
  86                 err(1, "fstat slave");
  87         if (stat(ptm.sn, &sts) == -1)
  88                 err(1, "stat slave");
  89         if (stm.st_rdev != sts.st_rdev)
  90                 errx(1, "slave device mismatch %lu != %lu",
  91                     (unsigned long)stm.st_rdev, (unsigned long)sts.st_rdev);
  92
  93         if (sts.st_uid != getuid())
  94                 errx(1, "bad slave uid %lu != %lu", (unsigned long)stm.st_uid,
  95                     getuid());
  96         if ((gp = getgrnam("tty")) == NULL)
  97                 errx(1, "cannot find `tty' group");
  98         if (sts.st_gid != gp->gr_gid)
  99                 errx(1, "bad slave gid %lu != %lu", (unsigned long)stm.st_gid,
 100                     gp->gr_gid);
 101         (void)close(ptm.sfd);
 102         (void)close(ptm.cfd);
 103         (void)close(fdm);
 104         return 0;
 105 }