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      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"

#ifdef HAVE_STDLIB_H
# include <cstdlib>
#endif
#ifdef HAVE_SYS_TYPES_H
# include <sys/types.h>
#endif
#ifdef HAVE_UNISTD_H
# include <unistd.h>
#endif
#if defined(HAVE_STRING_H)
# include <cstring>
#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
#ifdef HAVE_PTY_H
# include <pty.h>
#endif

// better do this via configure, but....
#if defined(__FreeBSD__)
# include <libutil.h>
#elif defined(__DARWIN__) || (defined (__MACH__) && defined (__APPLE__))
# 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"];

  if (openpty (&pfd, fd_tty, tty_name, NULL, NULL) != -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

#ifdef PTYS_ARE_GETPTY

  char           *ptydev;

  while ((ptydev = getpty ()) != NULL)
    if ((pfd = open (ptydev, O_RDWR | O_NOCTTY, 0)) >= 0)
      {
        *ttydev = ptydev;
        return pfd;
      }
#endif

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

  {
#  ifdef PTYS_ARE_GETPT
    pfd = getpt ();
#  else
    pfd = open ("/dev/ptmx", O_RDWR | O_NOCTTY, 0);
#  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, const char *ttydev)
{
#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
  /* ---------------------------------------- */
# if defined(TIOCSCTTY)
  fd = ioctl (fd_tty, TIOCSCTTY, NULL);
# elif defined(TIOCSETCTTY)
  fd = ioctl (fd_tty, TIOCSETCTTY, NULL);
# else
  fd = open (ttydev, O_RDWR);
  if (fd >= 0)
    close (fd);
# endif
  /* ---------------------------------------- */
  fd = open ("/dev/tty", O_WRONLY);
  if (fd < 0)
    return -1;          /* fatal */
  close (fd);
  /* ---------------------------------------- */
#endif                          /* ! __QNX__ */

  return 0;
}

#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::privileges (rxvt_privaction action)
{
  if (tty < 0)
    return;

  rxvt_privileges (RESTORE);

  if (action == SAVE)
    {
      //next_tty_action = RESTORE;
# 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 */
        ;//next_tty_action = IGNORE;
      else
# endif
        {
          chown (name, getuid (), ttyconf.gid);      /* fail silently */
          chmod (name, ttyconf.mode);
# ifdef HAVE_REVOKE
          revoke (name);
# endif
        }
    }
  else
    {                    /* action == RESTORE */
      //next_tty_action = IGNORE;
# ifndef RESET_TTY_TO_COMMON_DEFAULTS
      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::rxvt_ptytty ()
{
  pty = tty = -1;
  name = 0;
}

rxvt_ptytty::~rxvt_ptytty ()
{
  put ();
}

void

rxvt_ptytty::close_tty ()
{
  if (tty >= 0) close (tty);
  tty = -1;
}

void
rxvt_ptytty::put ()
{
#ifndef NO_SETOWNER_TTYDEV
  if (tty >= 0)
    privileges (RESTORE);
#endif

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

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

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

bool
rxvt_ptytty::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;
}

void
rxvt_ptytty::set_utf8_mode (bool on)
{
#ifdef IUTF8
  if (pty != -1)
    {
      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
}

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

Revision:	1.23
Committed:	Thu Feb 17 15:07:48 2005 UTC (19 years, 3 months ago) by root
Content type:	text/plain
Branch:	MAIN
CVS Tags:	rel-5_5, rel-5_4, rel-5_7, rel-5_3, rel-5_2, rel-5_9, rel-5_8, rel-6_0, rel-6_1
Changes since 1.22:	+3 -2 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	pcg	1.11	* Copyright (c) 2004 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			#ifdef HAVE_STDLIB_H
28	pcg	1.8	# include <cstdlib>
29	pcg	1.1	#endif
30			#ifdef HAVE_SYS_TYPES_H
31			# include <sys/types.h>
32			#endif
33			#ifdef HAVE_UNISTD_H
34			# include <unistd.h>
35			#endif
36			#if defined(HAVE_STRING_H)
37	pcg	1.8	# include <cstring>
38	pcg	1.1	#endif
39			#ifdef HAVE_FCNTL_H
40			# include <fcntl.h>
41			#endif
42			#ifdef HAVE_SYS_IOCTL_H
43			# include <sys/ioctl.h>
44			#endif
45	root	1.12	#if defined(PTYS_ARE_PTMX) && defined(HAVE_SYS_STROPTS_H)
46	pcg	1.1	# include <sys/stropts.h> /* for I_PUSH */
47			#endif
48	pcg	1.10	#ifdef HAVE_ISASTREAM
49			# include <stropts.h>
50			#endif
51	root	1.22	#ifdef HAVE_PTY_H
52			# include <pty.h>
53			#endif
54	pcg	1.1
55	root	1.16	// better do this via configure, but....
56	root	1.17	#if defined(__FreeBSD__)
57	root	1.16	# include <libutil.h>
58	root	1.18	#elif defined(__DARWIN__) \|\| (defined (__MACH__) && defined (__APPLE__))
59	root	1.17	# include <util.h>
60	pcg	1.1	#endif
61
62	root	1.16	#include <cstdio>
63			#include <grp.h>
64
65	pcg	1.1	/* ------------------------------------------------------------------------- *
66			* GET PSEUDO TELETYPE - MASTER AND SLAVE *
67			* ------------------------------------------------------------------------- */
68			/*
69			* Returns pty file descriptor, or -1 on failure
70			* If successful, ttydev is set to the name of the slave device.
71			* fd_tty _may_ also be set to an open fd to the slave device
72			*/
73	root	1.16	static int
74			get_pty (int fd_tty, char *ttydev)
75	pcg	1.1	{
76	pcg	1.4	int pfd;
77	pcg	1.1
78			#ifdef PTYS_ARE_OPENPTY
79	pcg	1.4	char tty_name[sizeof "/dev/pts/????\0"];
80
81	pcg	1.6	if (openpty (&pfd, fd_tty, tty_name, NULL, NULL) != -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			#ifdef PTYS_ARE_GETPTY
95
96	pcg	1.4	char *ptydev;
97
98	pcg	1.6	while ((ptydev = getpty ()) != NULL)
99			if ((pfd = open (ptydev, O_RDWR \| O_NOCTTY, 0)) >= 0)
100	pcg	1.4	{
101			*ttydev = ptydev;
102			return pfd;
103			}
104	pcg	1.1	#endif
105
106			#if defined(HAVE_GRANTPT) && defined(HAVE_UNLOCKPT)
107			# if defined(PTYS_ARE_GETPT) \|\| defined(PTYS_ARE_PTMX)
108	pcg	1.4
109			{
110	pcg	1.1	# ifdef PTYS_ARE_GETPT
111	pcg	1.6	pfd = getpt ();
112	pcg	1.1	# else
113	pcg	1.6	pfd = open ("/dev/ptmx", O_RDWR \| O_NOCTTY, 0);
114	pcg	1.1	# endif
115	pcg	1.4
116			if (pfd >= 0)
117			{
118	pcg	1.6	if (grantpt (pfd) == 0 /* change slave permissions */
119			&& unlockpt (pfd) == 0)
120	pcg	1.4	{ /* slave now unlocked */
121	root	1.16	ttydev = strdup (ptsname (pfd)); / get slave's name */
122	pcg	1.4	return pfd;
123			}
124	pcg	1.6	close (pfd);
125	pcg	1.4	}
126			}
127	pcg	1.1	# endif
128			#endif
129
130			#ifdef PTYS_ARE_PTC
131	pcg	1.6	if ((pfd = open ("/dev/ptc", O_RDWR \| O_NOCTTY, 0)) >= 0)
132	pcg	1.4	{
133	root	1.16	*ttydev = strdup (ttyname (pfd));
134	pcg	1.4	return pfd;
135	pcg	1.1	}
136			#endif
137
138			#ifdef PTYS_ARE_CLONE
139	pcg	1.6	if ((pfd = open ("/dev/ptym/clone", O_RDWR \| O_NOCTTY, 0)) >= 0)
140	pcg	1.4	{
141	root	1.16	*ttydev = strdup (ptsname (pfd));
142	pcg	1.4	return pfd;
143	pcg	1.1	}
144			#endif
145
146			#ifdef PTYS_ARE_NUMERIC
147	pcg	1.4	{
148	root	1.16	int idx;
149			char c1, c2;
150			char pty_name[] = "/dev/ptyp???";
151			char tty_name[] = "/dev/ttyp???";
152	pcg	1.4
153	root	1.16	c1 = &(pty_name[sizeof (pty_name) - 4]);
154			c2 = &(tty_name[sizeof (tty_name) - 4]);
155	pcg	1.4	for (idx = 0; idx < 256; idx++)
156			{
157	pcg	1.6	sprintf (c1, "%d", idx);
158			sprintf (c2, "%d", idx);
159			if (access (tty_name, F_OK) < 0)
160	pcg	1.4	{
161			idx = 256;
162			break;
163			}
164	root	1.16
165	pcg	1.6	if ((pfd = open (pty_name, O_RDWR \| O_NOCTTY, 0)) >= 0)
166	pcg	1.4	{
167	pcg	1.6	if (access (tty_name, R_OK \| W_OK) == 0)
168	pcg	1.4	{
169	pcg	1.6	*ttydev = strdup (tty_name);
170	pcg	1.4	return pfd;
171			}
172	root	1.16
173	pcg	1.6	close (pfd);
174	pcg	1.4	}
175			}
176			}
177	pcg	1.1	#endif
178	root	1.16
179	pcg	1.1	#ifdef PTYS_ARE_SEARCHED
180	pcg	1.4	{
181	root	1.16	const char c1, c2;
182			char pty_name[] = "/dev/pty??";
183			char tty_name[] = "/dev/tty??";
184	pcg	1.1
185			# ifndef PTYCHAR1
186			# define PTYCHAR1 "pqrstuvwxyz"
187			# endif
188			# ifndef PTYCHAR2
189			# define PTYCHAR2 "0123456789abcdef"
190			# endif
191	pcg	1.4
192			for (c1 = PTYCHAR1; *c1; c1++)
193			{
194	pcg	1.6	pty_name[ (sizeof (pty_name) - 3)] =
195			tty_name[ (sizeof (pty_name) - 3)] = *c1;
196	pcg	1.4	for (c2 = PTYCHAR2; *c2; c2++)
197			{
198	pcg	1.6	pty_name[ (sizeof (pty_name) - 2)] =
199			tty_name[ (sizeof (pty_name) - 2)] = *c2;
200			if ((pfd = open (pty_name, O_RDWR \| O_NOCTTY, 0)) >= 0)
201	pcg	1.4	{
202	pcg	1.6	if (access (tty_name, R_OK \| W_OK) == 0)
203	pcg	1.4	{
204	pcg	1.6	*ttydev = strdup (tty_name);
205	pcg	1.4	return pfd;
206			}
207	root	1.16
208	pcg	1.6	close (pfd);
209	pcg	1.4	}
210			}
211			}
212			}
213	pcg	1.1	#endif
214	root	1.16
215	pcg	1.4	return -1;
216	pcg	1.1	}
217
218			/----------------------------------------------------------------------/
219			/*
220			* Returns tty file descriptor, or -1 on failure
221			*/
222	root	1.16	static int
223			get_tty (char *ttydev)
224	pcg	1.1	{
225	pcg	1.4	return open (ttydev, O_RDWR \| O_NOCTTY, 0);
226	pcg	1.1	}
227
228			/----------------------------------------------------------------------/
229			/*
230			* Make our tty a controlling tty so that /dev/tty points to us
231			*/
232	root	1.16	static int
233			control_tty (int fd_tty, const char *ttydev)
234	pcg	1.1	{
235			#ifndef __QNX__
236	pcg	1.4	int fd;
237	pcg	1.1
238	pcg	1.4	/* ---------------------------------------- */
239	pcg	1.1	# ifdef HAVE_SETSID
240	pcg	1.4	setsid ();
241	pcg	1.1	# endif
242			# if defined(HAVE_SETPGID)
243	pcg	1.4	setpgid (0, 0);
244	pcg	1.1	# elif defined(HAVE_SETPGRP)
245	pcg	1.4	setpgrp (0, 0);
246	pcg	1.1	# endif
247	root	1.16
248	pcg	1.4	/* ---------------------------------------- */
249	pcg	1.1	# ifdef TIOCNOTTY
250	pcg	1.4	fd = open ("/dev/tty", O_RDWR \| O_NOCTTY);
251			if (fd >= 0)
252			{
253			ioctl (fd, TIOCNOTTY, NULL); /* void tty associations */
254			close (fd);
255	pcg	1.1	}
256			# endif
257	root	1.16
258	pcg	1.4	/* ---------------------------------------- */
259			fd = open ("/dev/tty", O_RDWR \| O_NOCTTY);
260			if (fd >= 0)
261			close (fd); /* ouch: still have controlling tty */
262	root	1.16
263	pcg	1.4	/* ---------------------------------------- */
264	pcg	1.1	#if defined(PTYS_ARE_PTMX) && defined(I_PUSH)
265	pcg	1.4	/*
266			* Push STREAMS modules:
267			* ptem: pseudo-terminal hardware emulation module.
268			* ldterm: standard terminal line discipline.
269			* ttcompat: V7, 4BSD and XENIX STREAMS compatibility module.
270			*
271	pcg	1.6	* After we push the STREAMS modules, the first open () on the slave side
272	pcg	1.4	* (i.e. the next section between the dashes giving us "tty opened OK")
273			* should make the "ptem" (or "ldterm" depending upon either which OS
274			* version or which set of manual pages you have) module give us a
275	pcg	1.6	* controlling terminal. We must already have close ()d the master side
276	pcg	1.4	* fd in this child process before we push STREAMS modules on because the
277	pcg	1.6	* documentation is really unclear about whether it is any close () on
278			* the master side or the last close () - i.e. a proper STREAMS dismantling
279			* close () - on the master side which causes a hang up to be sent
280	pcg	1.4	* through - Geoff Wing
281			*/
282	pcg	1.1	# ifdef HAVE_ISASTREAM
283	pcg	1.4	if (isastream (fd_tty) == 1)
284	pcg	1.1	# endif
285			{
286	pcg	1.4	ioctl (fd_tty, I_PUSH, "ptem");
287			ioctl (fd_tty, I_PUSH, "ldterm");
288			ioctl (fd_tty, I_PUSH, "ttcompat");
289	pcg	1.1	}
290			#endif
291	pcg	1.4	/* ---------------------------------------- */
292	pcg	1.1	# if defined(TIOCSCTTY)
293	pcg	1.4	fd = ioctl (fd_tty, TIOCSCTTY, NULL);
294	pcg	1.1	# elif defined(TIOCSETCTTY)
295	pcg	1.4	fd = ioctl (fd_tty, TIOCSETCTTY, NULL);
296	pcg	1.1	# else
297	pcg	1.4	fd = open (ttydev, O_RDWR);
298			if (fd >= 0)
299	pcg	1.6	close (fd);
300	pcg	1.1	# endif
301	pcg	1.4	/* ---------------------------------------- */
302			fd = open ("/dev/tty", O_WRONLY);
303			if (fd < 0)
304			return -1; /* fatal */
305			close (fd);
306			/* ---------------------------------------- */
307	pcg	1.1	#endif /* ! __QNX__ */
308	pcg	1.4
309			return 0;
310	pcg	1.1	}
311	root	1.16
312			#ifndef NO_SETOWNER_TTYDEV
313			static struct ttyconf {
314			gid_t gid;
315			mode_t mode;
316
317			ttyconf ()
318			{
319			#ifdef TTY_GID_SUPPORT
320			struct group *gr = getgrnam ("tty");
321
322			if (gr)
323			{ /* change group ownership of tty to "tty" */
324			mode = S_IRUSR \| S_IWUSR \| S_IWGRP;
325			gid = gr->gr_gid;
326			}
327			else
328			#endif /* TTY_GID_SUPPORT */
329			{
330			mode = S_IRUSR \| S_IWUSR \| S_IWGRP \| S_IWOTH;
331			gid = getgid ();
332			}
333			}
334			} ttyconf;
335
336			void
337			rxvt_ptytty::privileges (rxvt_privaction action)
338			{
339	root	1.23	if (tty < 0)
340			return;
341
342	root	1.16	rxvt_privileges (RESTORE);
343
344			if (action == SAVE)
345			{
346			//next_tty_action = RESTORE;
347			# ifndef RESET_TTY_TO_COMMON_DEFAULTS
348			/* store original tty status for restoration rxvt_clean_exit () -- rgg 04/12/95 */
349			if (lstat (name, &savestat) < 0) /* you lose out */
350			;//next_tty_action = IGNORE;
351			else
352			# endif
353			{
354			chown (name, getuid (), ttyconf.gid); /* fail silently */
355			chmod (name, ttyconf.mode);
356			# ifdef HAVE_REVOKE
357			revoke (name);
358			# endif
359			}
360			}
361			else
362			{ /* action == RESTORE */
363			//next_tty_action = IGNORE;
364			# ifndef RESET_TTY_TO_COMMON_DEFAULTS
365			chmod (name, savestat.st_mode);
366			chown (name, savestat.st_uid, savestat.st_gid);
367			# else
368			chmod (name, (S_IRUSR \| S_IWUSR \| S_IRGRP \| S_IWGRP \| S_IROTH \| S_IWOTH));
369			chown (name, 0, 0);
370			# endif
371
372			}
373
374			rxvt_privileges (IGNORE);
375			}
376			#endif
377
378			rxvt_ptytty::rxvt_ptytty ()
379			{
380			pty = tty = -1;
381			name = 0;
382			}
383
384			rxvt_ptytty::~rxvt_ptytty ()
385			{
386			put ();
387			}
388
389			void
390
391			rxvt_ptytty::close_tty ()
392			{
393			if (tty >= 0) close (tty);
394			tty = -1;
395			}
396
397			void
398			rxvt_ptytty::put ()
399			{
400			#ifndef NO_SETOWNER_TTYDEV
401			if (tty >= 0)
402			privileges (RESTORE);
403			#endif
404
405			if (pty >= 0) close (pty);
406			close_tty ();
407			free (name);
408
409			pty = tty = -1;
410			name = 0;
411			}
412
413			bool
414			rxvt_ptytty::make_controlling_tty ()
415			{
416			return control_tty (tty, name) >= 0;
417			}
418
419			bool
420			rxvt_ptytty::get ()
421			{
422			/* get master (pty) */
423			if ((pty = get_pty (&tty, &name)) < 0)
424			return false;
425
426			fcntl (pty, F_SETFL, O_NONBLOCK);
427
428			/* get slave (tty) */
429			if (tty < 0)
430			{
431			#ifndef NO_SETOWNER_TTYDEV
432			privileges (SAVE);
433			#endif
434
435			if ((tty = get_tty (name)) < 0)
436			{
437			put ();
438			return false;
439			}
440			}
441
442			return true;
443			}
444
445	root	1.22	void
446			rxvt_ptytty::set_utf8_mode (bool on)
447			{
448			#ifdef IUTF8
449			if (pty != -1)
450			{
451			struct termios tio;
452
453			if (tcgetattr (pty, &tio) != -1)
454			{
455			tcflag_t new_cflag = tio.c_iflag;
456
457			if (on)
458			new_cflag \|= IUTF8;
459			else
460			new_cflag &= ~IUTF8;
461
462			if (new_cflag != tio.c_iflag)
463			{
464			tio.c_iflag = new_cflag;
465			tcsetattr (pty, TCSANOW, &tio);
466			}
467			}
468			}
469			#endif
470			}
471
472	pcg	1.1	/----------------------- end-of-file (C source) -----------------------/
473	root	1.16