rxvt-unicode/src/ptytty.C

/*--------------------------------*-C-*---------------------------------*
 * File:        ptytty.C
 *----------------------------------------------------------------------*
 *
 * All portions of code are copyright by their respective author/s.
 * Copyright (c) 1999-2001 Geoff Wing <gcw@pobox.com>
 * Copyright (c) 2004-2006 Marc Lehmann <pcg@goof.com>
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 2 of the License, or
 * (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
 *---------------------------------------------------------------------*/

#include "../config.h"          /* NECESSARY */
#include "rxvt.h"

# include <cstdlib>
# include <cstring>

#ifdef HAVE_SYS_TYPES_H
# include <sys/types.h>
#endif
#ifdef HAVE_UNISTD_H
# include <unistd.h>
#endif
#ifdef HAVE_FCNTL_H
# include <fcntl.h>
#endif
#ifdef HAVE_SYS_IOCTL_H
# include <sys/ioctl.h>
#endif
#if defined(PTYS_ARE_PTMX) && defined(HAVE_SYS_STROPTS_H)
# include <sys/stropts.h>      /* for I_PUSH */
#endif
#ifdef HAVE_ISASTREAM
# include <stropts.h>
#endif
#if defined(HAVE_PTY_H)
# include <pty.h>
#elif defined(HAVE_LIBUTIL_H)
# include <libutil.h>
#elif defined(HAVE_UTIL_H)
# include <util.h>
#endif

#include <cstdio>
#include <grp.h>

/////////////////////////////////////////////////////////////////////////////

/* ------------------------------------------------------------------------- *
 *                  GET PSEUDO TELETYPE - MASTER AND SLAVE                   *
 * ------------------------------------------------------------------------- */
/*
 * Returns pty file descriptor, or -1 on failure 
 * If successful, ttydev is set to the name of the slave device.
 * fd_tty _may_ also be set to an open fd to the slave device
 */
static int
get_pty (int *fd_tty, char **ttydev)
{
  int pfd;

#ifdef PTYS_ARE_OPENPTY
  char tty_name[sizeof "/dev/pts/????\0"];

  rxvt_privileges(RESTORE);
  int res = openpty (&pfd, fd_tty, tty_name, NULL, NULL);
  rxvt_privileges(IGNORE);

  if (res != -1)
    {
      *ttydev = strdup (tty_name);
      return pfd;
    }
#endif

#ifdef PTYS_ARE__GETPTY
  *ttydev = _getpty (&pfd, O_RDWR | O_NONBLOCK | O_NOCTTY, 0622, 0);
  if (*ttydev != NULL)
    return pfd;
#endif

#if defined(HAVE_GRANTPT) && defined(HAVE_UNLOCKPT)
# if defined(PTYS_ARE_GETPT) || defined(PTYS_ARE_POSIX) || defined(PTYS_ARE_PTMX)

  {
#  ifdef PTYS_ARE_GETPT
    pfd = getpt();
#  else
#  ifdef PTYS_ARE_POSIX
    pfd = posix_openpt (O_RDWR);
#  else
    pfd = open ("/dev/ptmx", O_RDWR | O_NOCTTY, 0);
#  endif
#  endif

    if (pfd >= 0)
      {
        if (grantpt (pfd) == 0  /* change slave permissions */
            && unlockpt (pfd) == 0)
          {     /* slave now unlocked */
            *ttydev = strdup (ptsname (pfd));   /* get slave's name */
            return pfd;
          }
        close (pfd);
      }
  }
# endif
#endif

#ifdef PTYS_ARE_PTC
  if ((pfd = open ("/dev/ptc", O_RDWR | O_NOCTTY, 0)) >= 0)
    {
      *ttydev = strdup (ttyname (pfd));
      return pfd;
    }
#endif

#ifdef PTYS_ARE_CLONE
  if ((pfd = open ("/dev/ptym/clone", O_RDWR | O_NOCTTY, 0)) >= 0)
    {
      *ttydev = strdup (ptsname (pfd));
      return pfd;
    }
#endif

#ifdef PTYS_ARE_NUMERIC
  {
    int idx;
    char *c1, *c2;
    char pty_name[] = "/dev/ptyp???";
    char tty_name[] = "/dev/ttyp???";

    c1 = &(pty_name[sizeof (pty_name) - 4]);
    c2 = &(tty_name[sizeof (tty_name) - 4]);
    for (idx = 0; idx < 256; idx++)
      {
        sprintf (c1, "%d", idx);
        sprintf (c2, "%d", idx);
        if (access (tty_name, F_OK) < 0)
          {
            idx = 256;
            break;
          }

        if ((pfd = open (pty_name, O_RDWR | O_NOCTTY, 0)) >= 0)
          {
            if (access (tty_name, R_OK | W_OK) == 0)
              {
                *ttydev = strdup (tty_name);
                return pfd;
              }

            close (pfd);
          }
      }
  }
#endif

#ifdef PTYS_ARE_SEARCHED
  {
    const char *c1, *c2;
    char pty_name[] = "/dev/pty??";
    char tty_name[] = "/dev/tty??";

# ifndef PTYCHAR1
#  define PTYCHAR1      "pqrstuvwxyz"
# endif
# ifndef PTYCHAR2
#  define PTYCHAR2      "0123456789abcdef"
# endif

    for (c1 = PTYCHAR1; *c1; c1++)
      {
        pty_name[ (sizeof (pty_name) - 3)] =
          tty_name[ (sizeof (pty_name) - 3)] = *c1;
        for (c2 = PTYCHAR2; *c2; c2++)
          {
            pty_name[ (sizeof (pty_name) - 2)] =
              tty_name[ (sizeof (pty_name) - 2)] = *c2;
            if ((pfd = open (pty_name, O_RDWR | O_NOCTTY, 0)) >= 0)
              {
                if (access (tty_name, R_OK | W_OK) == 0)
                  {
                    *ttydev = strdup (tty_name);
                    return pfd;
                  }

                close (pfd);
              }
          }
      }
  }
#endif

  return -1;
}

/*----------------------------------------------------------------------*/
/*
 * Returns tty file descriptor, or -1 on failure 
 */
static int
get_tty (char *ttydev)
{
  return open (ttydev, O_RDWR | O_NOCTTY, 0);
}

/*----------------------------------------------------------------------*/
/*
 * Make our tty a controlling tty so that /dev/tty points to us
 */
static int
control_tty (int fd_tty)
{
#ifndef __QNX__
  int fd;

  /* ---------------------------------------- */
# ifdef HAVE_SETSID
  setsid ();
# endif
# if defined(HAVE_SETPGID)
  setpgid (0, 0);
# elif defined(HAVE_SETPGRP)
  setpgrp (0, 0);
# endif

  /* ---------------------------------------- */
# ifdef TIOCNOTTY
  fd = open ("/dev/tty", O_RDWR | O_NOCTTY);
  if (fd >= 0)
    {
      ioctl (fd, TIOCNOTTY, NULL);      /* void tty associations */
      close (fd);
    }
# endif

  /* ---------------------------------------- */
  fd = open ("/dev/tty", O_RDWR | O_NOCTTY);
  if (fd >= 0)
    close (fd);         /* ouch: still have controlling tty */

  /* ---------------------------------------- */
# if defined(PTYS_ARE_PTMX) && defined(I_PUSH)
  /*
   * Push STREAMS modules:
   *    ptem: pseudo-terminal hardware emulation module.
   *    ldterm: standard terminal line discipline.
   *    ttcompat: V7, 4BSD and XENIX STREAMS compatibility module.
   *
   * After we push the STREAMS modules, the first open () on the slave side
   * (i.e. the next section between the dashes giving us "tty opened OK")
   * should make the "ptem" (or "ldterm" depending upon either which OS
   * version or which set of manual pages you have) module give us a
   * controlling terminal.  We must already have close ()d the master side
   * fd in this child process before we push STREAMS modules on because the
   * documentation is really unclear about whether it is any close () on
   * the master side or the last close () - i.e. a proper STREAMS dismantling
   * close () - on the master side which causes a hang up to be sent
   * through - Geoff Wing
   */
#  ifdef HAVE_ISASTREAM
  if (isastream (fd_tty) == 1)
#  endif
    {
      ioctl (fd_tty, I_PUSH, "ptem");
      ioctl (fd_tty, I_PUSH, "ldterm");
      ioctl (fd_tty, I_PUSH, "ttcompat");
    }
# endif
  /* ---------------------------------------- */
  fd = ioctl (fd_tty, TIOCSCTTY, NULL);
  /* ---------------------------------------- */
  fd = open ("/dev/tty", O_WRONLY);
  if (fd < 0)
    return -1;          /* fatal */
  close (fd);
  /* ---------------------------------------- */
#endif                          /* ! __QNX__ */

  return 0;
}

void
rxvt_ptytty::close_tty ()
{
  if (tty < 0)
    return;

  close (tty);
  tty = -1;
}

bool
rxvt_ptytty::make_controlling_tty ()
{
  return control_tty (tty) >= 0;
}

void
rxvt_ptytty::set_utf8_mode (bool on)
{
#ifdef IUTF8
  if (pty < 0)
    return;

  struct termios tio;

  if (tcgetattr (pty, &tio) != -1)
    {
      tcflag_t new_cflag = tio.c_iflag;

      if (on)
        new_cflag |= IUTF8;
      else
        new_cflag &= ~IUTF8;

      if (new_cflag != tio.c_iflag)
        {
          tio.c_iflag = new_cflag;
          tcsetattr (pty, TCSANOW, &tio);
        }
    }
#endif
}

/////////////////////////////////////////////////////////////////////////////

#ifndef NO_SETOWNER_TTYDEV
static struct ttyconf {
  gid_t gid;
  mode_t mode;

  ttyconf ()
    {
#ifdef TTY_GID_SUPPORT
      struct group *gr = getgrnam ("tty");

      if (gr)
        {           /* change group ownership of tty to "tty" */
          mode = S_IRUSR | S_IWUSR | S_IWGRP;
          gid = gr->gr_gid;
        }
      else
#endif                          /* TTY_GID_SUPPORT */
        {
          mode = S_IRUSR | S_IWUSR | S_IWGRP | S_IWOTH;
          gid = getgid ();
        }
    }
} ttyconf;

/////////////////////////////////////////////////////////////////////////////

void
rxvt_ptytty_unix::privileges (rxvt_privaction action)
{
  if (!name || !*name)
    return;

  rxvt_privileges (RESTORE);

  if (action == SAVE)
    {
# ifndef RESET_TTY_TO_COMMON_DEFAULTS
      /* store original tty status for restoration rxvt_clean_exit () -- rgg 04/12/95 */
      if (lstat (name, &savestat) < 0)       /* you lose out */
        ;
      else
# endif
        {
          saved = true;
          chown (name, getuid (), ttyconf.gid);      /* fail silently */
          chmod (name, ttyconf.mode);
# ifdef HAVE_REVOKE
          revoke (name);
# endif
        }
    }
  else
    {                    /* action == RESTORE */
# ifndef RESET_TTY_TO_COMMON_DEFAULTS
      if (saved)
        {
          chmod (name, savestat.st_mode);
          chown (name, savestat.st_uid, savestat.st_gid);
        }
# else
      chmod (name, (S_IRUSR | S_IWUSR | S_IRGRP | S_IWGRP | S_IROTH | S_IWOTH));
      chown (name, 0, 0);
# endif

    }

  rxvt_privileges (IGNORE);
}
#endif

rxvt_ptytty_unix::rxvt_ptytty_unix ()
{
  pty = tty = -1;
  name = 0;
#ifndef NO_SETOWNER_TTYDEV
  saved = false;
#endif
#if UTMP_SUPPORT
  cmd_pid = 0;
#endif
}

rxvt_ptytty_unix::~rxvt_ptytty_unix ()
{
  logout ();
  put ();
}

void
rxvt_ptytty_unix::put ()
{
#ifndef NO_SETOWNER_TTYDEV
  privileges (RESTORE);
#endif

  if (pty >= 0) close (pty);
  close_tty ();
  free (name);

  pty = tty = -1;
  name = 0;
}

bool
rxvt_ptytty_unix::get ()
{
  /* get master (pty) */
  if ((pty = get_pty (&tty, &name)) < 0)
    return false;

  fcntl (pty, F_SETFL, O_NONBLOCK);

  /* get slave (tty) */
  if (tty < 0)
    {
#ifndef NO_SETOWNER_TTYDEV
      privileges (SAVE);
#endif

      if ((tty = get_tty (name)) < 0)
        {
          put ();
          return false;
        }
    }

  return true;
}

/*----------------------- end-of-file (C source) -----------------------*/

Revision:	1.36
Committed:	Tue Jan 17 10:59:32 2006 UTC (18 years, 4 months ago) by root
Content type:	text/plain
Branch:	MAIN
Changes since 1.35:	+59 -62 lines
Log Message:	* empty log message *
#	User	Rev	Content
1	pcg	1.1	/---------------------------------C----------------------------------
2	pcg	1.11	* File: ptytty.C
3	pcg	1.1	----------------------------------------------------------------------
4			*
5			* All portions of code are copyright by their respective author/s.
6			* Copyright (c) 1999-2001 Geoff Wing <gcw@pobox.com>
7	root	1.30	* Copyright (c) 2004-2006 Marc Lehmann <pcg@goof.com>
8	pcg	1.1	*
9			* This program is free software; you can redistribute it and/or modify
10			* it under the terms of the GNU General Public License as published by
11			* the Free Software Foundation; either version 2 of the License, or
12			* (at your option) any later version.
13			*
14			* This program is distributed in the hope that it will be useful,
15			* but WITHOUT ANY WARRANTY; without even the implied warranty of
16			* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
17			* GNU General Public License for more details.
18			*
19			* You should have received a copy of the GNU General Public License
20			* along with this program; if not, write to the Free Software
21			* Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
22			---------------------------------------------------------------------/
23
24			#include "../config.h" /* NECESSARY */
25	root	1.16	#include "rxvt.h"
26	pcg	1.1
27	pcg	1.8	# include <cstdlib>
28	root	1.31	# include <cstring>
29
30	pcg	1.1	#ifdef HAVE_SYS_TYPES_H
31			# include <sys/types.h>
32			#endif
33			#ifdef HAVE_UNISTD_H
34			# include <unistd.h>
35			#endif
36			#ifdef HAVE_FCNTL_H
37			# include <fcntl.h>
38			#endif
39			#ifdef HAVE_SYS_IOCTL_H
40			# include <sys/ioctl.h>
41			#endif
42	root	1.12	#if defined(PTYS_ARE_PTMX) && defined(HAVE_SYS_STROPTS_H)
43	pcg	1.1	# include <sys/stropts.h> /* for I_PUSH */
44			#endif
45	pcg	1.10	#ifdef HAVE_ISASTREAM
46			# include <stropts.h>
47			#endif
48	root	1.31	#if defined(HAVE_PTY_H)
49	root	1.22	# include <pty.h>
50	root	1.31	#elif defined(HAVE_LIBUTIL_H)
51	root	1.16	# include <libutil.h>
52	root	1.31	#elif defined(HAVE_UTIL_H)
53	root	1.17	# include <util.h>
54	pcg	1.1	#endif
55
56	root	1.16	#include <cstdio>
57			#include <grp.h>
58
59	root	1.36	/////////////////////////////////////////////////////////////////////////////
60
61	pcg	1.1	/* ------------------------------------------------------------------------- *
62			* GET PSEUDO TELETYPE - MASTER AND SLAVE *
63			* ------------------------------------------------------------------------- */
64			/*
65			* Returns pty file descriptor, or -1 on failure
66			* If successful, ttydev is set to the name of the slave device.
67			* fd_tty _may_ also be set to an open fd to the slave device
68			*/
69	root	1.16	static int
70			get_pty (int fd_tty, char *ttydev)
71	pcg	1.1	{
72	pcg	1.4	int pfd;
73	pcg	1.1
74			#ifdef PTYS_ARE_OPENPTY
75	root	1.26	char tty_name[sizeof "/dev/pts/????\0"];
76	pcg	1.4
77	root	1.27	rxvt_privileges(RESTORE);
78			int res = openpty (&pfd, fd_tty, tty_name, NULL, NULL);
79			rxvt_privileges(IGNORE);
80
81			if (res != -1)
82	pcg	1.4	{
83	pcg	1.6	*ttydev = strdup (tty_name);
84	pcg	1.4	return pfd;
85	pcg	1.1	}
86			#endif
87
88			#ifdef PTYS_ARE__GETPTY
89	pcg	1.6	*ttydev = _getpty (&pfd, O_RDWR \| O_NONBLOCK \| O_NOCTTY, 0622, 0);
90	pcg	1.4	if (*ttydev != NULL)
91			return pfd;
92	pcg	1.1	#endif
93
94			#if defined(HAVE_GRANTPT) && defined(HAVE_UNLOCKPT)
95	ayin	1.34	# if defined(PTYS_ARE_GETPT) \|\| defined(PTYS_ARE_POSIX) \|\| defined(PTYS_ARE_PTMX)
96	pcg	1.4
97			{
98	ayin	1.34	# ifdef PTYS_ARE_GETPT
99			pfd = getpt();
100			# else
101	root	1.33	# ifdef PTYS_ARE_POSIX
102			pfd = posix_openpt (O_RDWR);
103	pcg	1.1	# else
104	pcg	1.6	pfd = open ("/dev/ptmx", O_RDWR \| O_NOCTTY, 0);
105	pcg	1.1	# endif
106	ayin	1.34	# endif
107	pcg	1.4
108			if (pfd >= 0)
109			{
110	pcg	1.6	if (grantpt (pfd) == 0 /* change slave permissions */
111			&& unlockpt (pfd) == 0)
112	pcg	1.4	{ /* slave now unlocked */
113	root	1.16	ttydev = strdup (ptsname (pfd)); / get slave's name */
114	pcg	1.4	return pfd;
115			}
116	pcg	1.6	close (pfd);
117	pcg	1.4	}
118			}
119	pcg	1.1	# endif
120			#endif
121
122			#ifdef PTYS_ARE_PTC
123	pcg	1.6	if ((pfd = open ("/dev/ptc", O_RDWR \| O_NOCTTY, 0)) >= 0)
124	pcg	1.4	{
125	root	1.16	*ttydev = strdup (ttyname (pfd));
126	pcg	1.4	return pfd;
127	pcg	1.1	}
128			#endif
129
130			#ifdef PTYS_ARE_CLONE
131	pcg	1.6	if ((pfd = open ("/dev/ptym/clone", O_RDWR \| O_NOCTTY, 0)) >= 0)
132	pcg	1.4	{
133	root	1.16	*ttydev = strdup (ptsname (pfd));
134	pcg	1.4	return pfd;
135	pcg	1.1	}
136			#endif
137
138			#ifdef PTYS_ARE_NUMERIC
139	pcg	1.4	{
140	root	1.16	int idx;
141			char c1, c2;
142			char pty_name[] = "/dev/ptyp???";
143			char tty_name[] = "/dev/ttyp???";
144	pcg	1.4
145	root	1.16	c1 = &(pty_name[sizeof (pty_name) - 4]);
146			c2 = &(tty_name[sizeof (tty_name) - 4]);
147	pcg	1.4	for (idx = 0; idx < 256; idx++)
148			{
149	pcg	1.6	sprintf (c1, "%d", idx);
150			sprintf (c2, "%d", idx);
151			if (access (tty_name, F_OK) < 0)
152	pcg	1.4	{
153			idx = 256;
154			break;
155			}
156	root	1.16
157	pcg	1.6	if ((pfd = open (pty_name, O_RDWR \| O_NOCTTY, 0)) >= 0)
158	pcg	1.4	{
159	pcg	1.6	if (access (tty_name, R_OK \| W_OK) == 0)
160	pcg	1.4	{
161	pcg	1.6	*ttydev = strdup (tty_name);
162	pcg	1.4	return pfd;
163			}
164	root	1.16
165	pcg	1.6	close (pfd);
166	pcg	1.4	}
167			}
168			}
169	pcg	1.1	#endif
170	root	1.16
171	pcg	1.1	#ifdef PTYS_ARE_SEARCHED
172	pcg	1.4	{
173	root	1.16	const char c1, c2;
174			char pty_name[] = "/dev/pty??";
175			char tty_name[] = "/dev/tty??";
176	pcg	1.1
177			# ifndef PTYCHAR1
178			# define PTYCHAR1 "pqrstuvwxyz"
179			# endif
180			# ifndef PTYCHAR2
181			# define PTYCHAR2 "0123456789abcdef"
182			# endif
183	pcg	1.4
184			for (c1 = PTYCHAR1; *c1; c1++)
185			{
186	pcg	1.6	pty_name[ (sizeof (pty_name) - 3)] =
187			tty_name[ (sizeof (pty_name) - 3)] = *c1;
188	pcg	1.4	for (c2 = PTYCHAR2; *c2; c2++)
189			{
190	pcg	1.6	pty_name[ (sizeof (pty_name) - 2)] =
191			tty_name[ (sizeof (pty_name) - 2)] = *c2;
192			if ((pfd = open (pty_name, O_RDWR \| O_NOCTTY, 0)) >= 0)
193	pcg	1.4	{
194	pcg	1.6	if (access (tty_name, R_OK \| W_OK) == 0)
195	pcg	1.4	{
196	pcg	1.6	*ttydev = strdup (tty_name);
197	pcg	1.4	return pfd;
198			}
199	root	1.16
200	pcg	1.6	close (pfd);
201	pcg	1.4	}
202			}
203			}
204			}
205	pcg	1.1	#endif
206	root	1.16
207	pcg	1.4	return -1;
208	pcg	1.1	}
209
210			/----------------------------------------------------------------------/
211			/*
212			* Returns tty file descriptor, or -1 on failure
213			*/
214	root	1.16	static int
215			get_tty (char *ttydev)
216	pcg	1.1	{
217	pcg	1.4	return open (ttydev, O_RDWR \| O_NOCTTY, 0);
218	pcg	1.1	}
219
220			/----------------------------------------------------------------------/
221			/*
222			* Make our tty a controlling tty so that /dev/tty points to us
223			*/
224	root	1.16	static int
225	root	1.36	control_tty (int fd_tty)
226	pcg	1.1	{
227			#ifndef __QNX__
228	pcg	1.4	int fd;
229	pcg	1.1
230	pcg	1.4	/* ---------------------------------------- */
231	pcg	1.1	# ifdef HAVE_SETSID
232	pcg	1.4	setsid ();
233	pcg	1.1	# endif
234			# if defined(HAVE_SETPGID)
235	pcg	1.4	setpgid (0, 0);
236	pcg	1.1	# elif defined(HAVE_SETPGRP)
237	pcg	1.4	setpgrp (0, 0);
238	pcg	1.1	# endif
239	root	1.16
240	pcg	1.4	/* ---------------------------------------- */
241	pcg	1.1	# ifdef TIOCNOTTY
242	pcg	1.4	fd = open ("/dev/tty", O_RDWR \| O_NOCTTY);
243			if (fd >= 0)
244			{
245			ioctl (fd, TIOCNOTTY, NULL); /* void tty associations */
246			close (fd);
247	pcg	1.1	}
248			# endif
249	root	1.16
250	pcg	1.4	/* ---------------------------------------- */
251			fd = open ("/dev/tty", O_RDWR \| O_NOCTTY);
252			if (fd >= 0)
253			close (fd); /* ouch: still have controlling tty */
254	root	1.16
255	pcg	1.4	/* ---------------------------------------- */
256	root	1.36	# if defined(PTYS_ARE_PTMX) && defined(I_PUSH)
257	pcg	1.4	/*
258			* Push STREAMS modules:
259			* ptem: pseudo-terminal hardware emulation module.
260			* ldterm: standard terminal line discipline.
261			* ttcompat: V7, 4BSD and XENIX STREAMS compatibility module.
262			*
263	pcg	1.6	* After we push the STREAMS modules, the first open () on the slave side
264	pcg	1.4	* (i.e. the next section between the dashes giving us "tty opened OK")
265			* should make the "ptem" (or "ldterm" depending upon either which OS
266			* version or which set of manual pages you have) module give us a
267	pcg	1.6	* controlling terminal. We must already have close ()d the master side
268	pcg	1.4	* fd in this child process before we push STREAMS modules on because the
269	pcg	1.6	* documentation is really unclear about whether it is any close () on
270			* the master side or the last close () - i.e. a proper STREAMS dismantling
271			* close () - on the master side which causes a hang up to be sent
272	pcg	1.4	* through - Geoff Wing
273			*/
274	root	1.36	# ifdef HAVE_ISASTREAM
275	pcg	1.4	if (isastream (fd_tty) == 1)
276	root	1.36	# endif
277	pcg	1.1	{
278	pcg	1.4	ioctl (fd_tty, I_PUSH, "ptem");
279			ioctl (fd_tty, I_PUSH, "ldterm");
280			ioctl (fd_tty, I_PUSH, "ttcompat");
281	pcg	1.1	}
282	root	1.36	# endif
283	pcg	1.4	/* ---------------------------------------- */
284			fd = ioctl (fd_tty, TIOCSCTTY, NULL);
285			/* ---------------------------------------- */
286			fd = open ("/dev/tty", O_WRONLY);
287			if (fd < 0)
288			return -1; /* fatal */
289			close (fd);
290			/* ---------------------------------------- */
291	pcg	1.1	#endif /* ! __QNX__ */
292	pcg	1.4
293			return 0;
294	pcg	1.1	}
295	root	1.16
296	root	1.36	void
297			rxvt_ptytty::close_tty ()
298			{
299			if (tty < 0)
300			return;
301
302			close (tty);
303			tty = -1;
304			}
305
306			bool
307			rxvt_ptytty::make_controlling_tty ()
308			{
309			return control_tty (tty) >= 0;
310			}
311
312			void
313			rxvt_ptytty::set_utf8_mode (bool on)
314			{
315			#ifdef IUTF8
316			if (pty < 0)
317			return;
318
319			struct termios tio;
320
321			if (tcgetattr (pty, &tio) != -1)
322			{
323			tcflag_t new_cflag = tio.c_iflag;
324
325			if (on)
326			new_cflag \|= IUTF8;
327			else
328			new_cflag &= ~IUTF8;
329
330			if (new_cflag != tio.c_iflag)
331			{
332			tio.c_iflag = new_cflag;
333			tcsetattr (pty, TCSANOW, &tio);
334			}
335			}
336			#endif
337			}
338
339			/////////////////////////////////////////////////////////////////////////////
340
341	root	1.16	#ifndef NO_SETOWNER_TTYDEV
342			static struct ttyconf {
343			gid_t gid;
344			mode_t mode;
345
346			ttyconf ()
347			{
348			#ifdef TTY_GID_SUPPORT
349			struct group *gr = getgrnam ("tty");
350
351			if (gr)
352			{ /* change group ownership of tty to "tty" */
353			mode = S_IRUSR \| S_IWUSR \| S_IWGRP;
354			gid = gr->gr_gid;
355			}
356			else
357			#endif /* TTY_GID_SUPPORT */
358			{
359			mode = S_IRUSR \| S_IWUSR \| S_IWGRP \| S_IWOTH;
360			gid = getgid ();
361			}
362			}
363			} ttyconf;
364
365	root	1.36	/////////////////////////////////////////////////////////////////////////////
366
367	root	1.16	void
368	root	1.36	rxvt_ptytty_unix::privileges (rxvt_privaction action)
369	root	1.16	{
370	root	1.26	if (!name \|\| !*name)
371	root	1.23	return;
372
373	root	1.16	rxvt_privileges (RESTORE);
374
375			if (action == SAVE)
376			{
377			# ifndef RESET_TTY_TO_COMMON_DEFAULTS
378			/* store original tty status for restoration rxvt_clean_exit () -- rgg 04/12/95 */
379			if (lstat (name, &savestat) < 0) /* you lose out */
380	root	1.26	;
381	root	1.16	else
382			# endif
383			{
384	root	1.26	saved = true;
385	root	1.16	chown (name, getuid (), ttyconf.gid); /* fail silently */
386			chmod (name, ttyconf.mode);
387			# ifdef HAVE_REVOKE
388			revoke (name);
389			# endif
390			}
391			}
392			else
393			{ /* action == RESTORE */
394			# ifndef RESET_TTY_TO_COMMON_DEFAULTS
395	root	1.26	if (saved)
396			{
397			chmod (name, savestat.st_mode);
398			chown (name, savestat.st_uid, savestat.st_gid);
399			}
400	root	1.16	# else
401			chmod (name, (S_IRUSR \| S_IWUSR \| S_IRGRP \| S_IWGRP \| S_IROTH \| S_IWOTH));
402			chown (name, 0, 0);
403			# endif
404
405			}
406
407			rxvt_privileges (IGNORE);
408			}
409			#endif
410
411	root	1.36	rxvt_ptytty_unix::rxvt_ptytty_unix ()
412	root	1.16	{
413			pty = tty = -1;
414			name = 0;
415	root	1.26	#ifndef NO_SETOWNER_TTYDEV
416			saved = false;
417			#endif
418	root	1.35	#if UTMP_SUPPORT
419			cmd_pid = 0;
420			#endif
421	root	1.16	}
422
423	root	1.36	rxvt_ptytty_unix::~rxvt_ptytty_unix ()
424	root	1.16	{
425	root	1.35	logout ();
426	root	1.16	put ();
427			}
428
429			void
430	root	1.36	rxvt_ptytty_unix::put ()
431	root	1.16	{
432			#ifndef NO_SETOWNER_TTYDEV
433	root	1.28	privileges (RESTORE);
434	root	1.16	#endif
435
436			if (pty >= 0) close (pty);
437			close_tty ();
438			free (name);
439
440			pty = tty = -1;
441			name = 0;
442			}
443
444			bool
445	root	1.36	rxvt_ptytty_unix::get ()
446	root	1.16	{
447			/* get master (pty) */
448			if ((pty = get_pty (&tty, &name)) < 0)
449			return false;
450
451			fcntl (pty, F_SETFL, O_NONBLOCK);
452
453			/* get slave (tty) */
454			if (tty < 0)
455			{
456			#ifndef NO_SETOWNER_TTYDEV
457			privileges (SAVE);
458			#endif
459
460			if ((tty = get_tty (name)) < 0)
461			{
462			put ();
463			return false;
464			}
465			}
466
467			return true;
468			}
469
470	pcg	1.1	/----------------------- end-of-file (C source) -----------------------/
471	root	1.16