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"];

  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

#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 (!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::rxvt_ptytty ()
{
  pty = tty = -1;
  name = 0;
#ifndef NO_SETOWNER_TTYDEV
  saved = false;
#endif
}

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

void

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

  close (tty);
  tty = -1;
}

void
rxvt_ptytty::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::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 < 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
}

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

Revision:	1.29
Committed:	Fri Jan 6 02:11:15 2006 UTC (18 years, 4 months ago) by root
Content type:	text/plain
Branch:	MAIN
Changes since 1.28:	+19 -16 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	root	1.26	char tty_name[sizeof "/dev/pts/????\0"];
80	pcg	1.4
81	root	1.27	rxvt_privileges(RESTORE);
82			int res = openpty (&pfd, fd_tty, tty_name, NULL, NULL);
83			rxvt_privileges(IGNORE);
84
85			if (res != -1)
86	pcg	1.4	{
87	pcg	1.6	*ttydev = strdup (tty_name);
88	pcg	1.4	return pfd;
89	pcg	1.1	}
90			#endif
91
92			#ifdef PTYS_ARE__GETPTY
93	pcg	1.6	*ttydev = _getpty (&pfd, O_RDWR \| O_NONBLOCK \| O_NOCTTY, 0622, 0);
94	pcg	1.4	if (*ttydev != NULL)
95			return pfd;
96	pcg	1.1	#endif
97
98			#ifdef PTYS_ARE_GETPTY
99	pcg	1.4	char *ptydev;
100
101	pcg	1.6	while ((ptydev = getpty ()) != NULL)
102			if ((pfd = open (ptydev, O_RDWR \| O_NOCTTY, 0)) >= 0)
103	pcg	1.4	{
104			*ttydev = ptydev;
105			return pfd;
106			}
107	pcg	1.1	#endif
108
109			#if defined(HAVE_GRANTPT) && defined(HAVE_UNLOCKPT)
110			# if defined(PTYS_ARE_GETPT) \|\| defined(PTYS_ARE_PTMX)
111	pcg	1.4
112			{
113	pcg	1.1	# ifdef PTYS_ARE_GETPT
114	pcg	1.6	pfd = getpt ();
115	pcg	1.1	# else
116	pcg	1.6	pfd = open ("/dev/ptmx", O_RDWR \| O_NOCTTY, 0);
117	pcg	1.1	# endif
118	pcg	1.4
119			if (pfd >= 0)
120			{
121	pcg	1.6	if (grantpt (pfd) == 0 /* change slave permissions */
122			&& unlockpt (pfd) == 0)
123	pcg	1.4	{ /* slave now unlocked */
124	root	1.16	ttydev = strdup (ptsname (pfd)); / get slave's name */
125	pcg	1.4	return pfd;
126			}
127	pcg	1.6	close (pfd);
128	pcg	1.4	}
129			}
130	pcg	1.1	# endif
131			#endif
132
133			#ifdef PTYS_ARE_PTC
134	pcg	1.6	if ((pfd = open ("/dev/ptc", O_RDWR \| O_NOCTTY, 0)) >= 0)
135	pcg	1.4	{
136	root	1.16	*ttydev = strdup (ttyname (pfd));
137	pcg	1.4	return pfd;
138	pcg	1.1	}
139			#endif
140
141			#ifdef PTYS_ARE_CLONE
142	pcg	1.6	if ((pfd = open ("/dev/ptym/clone", O_RDWR \| O_NOCTTY, 0)) >= 0)
143	pcg	1.4	{
144	root	1.16	*ttydev = strdup (ptsname (pfd));
145	pcg	1.4	return pfd;
146	pcg	1.1	}
147			#endif
148
149			#ifdef PTYS_ARE_NUMERIC
150	pcg	1.4	{
151	root	1.16	int idx;
152			char c1, c2;
153			char pty_name[] = "/dev/ptyp???";
154			char tty_name[] = "/dev/ttyp???";
155	pcg	1.4
156	root	1.16	c1 = &(pty_name[sizeof (pty_name) - 4]);
157			c2 = &(tty_name[sizeof (tty_name) - 4]);
158	pcg	1.4	for (idx = 0; idx < 256; idx++)
159			{
160	pcg	1.6	sprintf (c1, "%d", idx);
161			sprintf (c2, "%d", idx);
162			if (access (tty_name, F_OK) < 0)
163	pcg	1.4	{
164			idx = 256;
165			break;
166			}
167	root	1.16
168	pcg	1.6	if ((pfd = open (pty_name, O_RDWR \| O_NOCTTY, 0)) >= 0)
169	pcg	1.4	{
170	pcg	1.6	if (access (tty_name, R_OK \| W_OK) == 0)
171	pcg	1.4	{
172	pcg	1.6	*ttydev = strdup (tty_name);
173	pcg	1.4	return pfd;
174			}
175	root	1.16
176	pcg	1.6	close (pfd);
177	pcg	1.4	}
178			}
179			}
180	pcg	1.1	#endif
181	root	1.16
182	pcg	1.1	#ifdef PTYS_ARE_SEARCHED
183	pcg	1.4	{
184	root	1.16	const char c1, c2;
185			char pty_name[] = "/dev/pty??";
186			char tty_name[] = "/dev/tty??";
187	pcg	1.1
188			# ifndef PTYCHAR1
189			# define PTYCHAR1 "pqrstuvwxyz"
190			# endif
191			# ifndef PTYCHAR2
192			# define PTYCHAR2 "0123456789abcdef"
193			# endif
194	pcg	1.4
195			for (c1 = PTYCHAR1; *c1; c1++)
196			{
197	pcg	1.6	pty_name[ (sizeof (pty_name) - 3)] =
198			tty_name[ (sizeof (pty_name) - 3)] = *c1;
199	pcg	1.4	for (c2 = PTYCHAR2; *c2; c2++)
200			{
201	pcg	1.6	pty_name[ (sizeof (pty_name) - 2)] =
202			tty_name[ (sizeof (pty_name) - 2)] = *c2;
203			if ((pfd = open (pty_name, O_RDWR \| O_NOCTTY, 0)) >= 0)
204	pcg	1.4	{
205	pcg	1.6	if (access (tty_name, R_OK \| W_OK) == 0)
206	pcg	1.4	{
207	pcg	1.6	*ttydev = strdup (tty_name);
208	pcg	1.4	return pfd;
209			}
210	root	1.16
211	pcg	1.6	close (pfd);
212	pcg	1.4	}
213			}
214			}
215			}
216	pcg	1.1	#endif
217	root	1.16
218	pcg	1.4	return -1;
219	pcg	1.1	}
220
221			/----------------------------------------------------------------------/
222			/*
223			* Returns tty file descriptor, or -1 on failure
224			*/
225	root	1.16	static int
226			get_tty (char *ttydev)
227	pcg	1.1	{
228	pcg	1.4	return open (ttydev, O_RDWR \| O_NOCTTY, 0);
229	pcg	1.1	}
230
231			/----------------------------------------------------------------------/
232			/*
233			* Make our tty a controlling tty so that /dev/tty points to us
234			*/
235	root	1.16	static int
236			control_tty (int fd_tty, const char *ttydev)
237	pcg	1.1	{
238			#ifndef __QNX__
239	pcg	1.4	int fd;
240	pcg	1.1
241	pcg	1.4	/* ---------------------------------------- */
242	pcg	1.1	# ifdef HAVE_SETSID
243	pcg	1.4	setsid ();
244	pcg	1.1	# endif
245			# if defined(HAVE_SETPGID)
246	pcg	1.4	setpgid (0, 0);
247	pcg	1.1	# elif defined(HAVE_SETPGRP)
248	pcg	1.4	setpgrp (0, 0);
249	pcg	1.1	# endif
250	root	1.16
251	pcg	1.4	/* ---------------------------------------- */
252	pcg	1.1	# ifdef TIOCNOTTY
253	pcg	1.4	fd = open ("/dev/tty", O_RDWR \| O_NOCTTY);
254			if (fd >= 0)
255			{
256			ioctl (fd, TIOCNOTTY, NULL); /* void tty associations */
257			close (fd);
258	pcg	1.1	}
259			# endif
260	root	1.16
261	pcg	1.4	/* ---------------------------------------- */
262			fd = open ("/dev/tty", O_RDWR \| O_NOCTTY);
263			if (fd >= 0)
264			close (fd); /* ouch: still have controlling tty */
265	root	1.16
266	pcg	1.4	/* ---------------------------------------- */
267	pcg	1.1	#if defined(PTYS_ARE_PTMX) && defined(I_PUSH)
268	pcg	1.4	/*
269			* Push STREAMS modules:
270			* ptem: pseudo-terminal hardware emulation module.
271			* ldterm: standard terminal line discipline.
272			* ttcompat: V7, 4BSD and XENIX STREAMS compatibility module.
273			*
274	pcg	1.6	* After we push the STREAMS modules, the first open () on the slave side
275	pcg	1.4	* (i.e. the next section between the dashes giving us "tty opened OK")
276			* should make the "ptem" (or "ldterm" depending upon either which OS
277			* version or which set of manual pages you have) module give us a
278	pcg	1.6	* controlling terminal. We must already have close ()d the master side
279	pcg	1.4	* fd in this child process before we push STREAMS modules on because the
280	pcg	1.6	* documentation is really unclear about whether it is any close () on
281			* the master side or the last close () - i.e. a proper STREAMS dismantling
282			* close () - on the master side which causes a hang up to be sent
283	pcg	1.4	* through - Geoff Wing
284			*/
285	pcg	1.1	# ifdef HAVE_ISASTREAM
286	pcg	1.4	if (isastream (fd_tty) == 1)
287	pcg	1.1	# endif
288			{
289	pcg	1.4	ioctl (fd_tty, I_PUSH, "ptem");
290			ioctl (fd_tty, I_PUSH, "ldterm");
291			ioctl (fd_tty, I_PUSH, "ttcompat");
292	pcg	1.1	}
293			#endif
294	pcg	1.4	/* ---------------------------------------- */
295	pcg	1.1	# if defined(TIOCSCTTY)
296	pcg	1.4	fd = ioctl (fd_tty, TIOCSCTTY, NULL);
297	pcg	1.1	# elif defined(TIOCSETCTTY)
298	pcg	1.4	fd = ioctl (fd_tty, TIOCSETCTTY, NULL);
299	pcg	1.1	# else
300	pcg	1.4	fd = open (ttydev, O_RDWR);
301			if (fd >= 0)
302	pcg	1.6	close (fd);
303	pcg	1.1	# endif
304	pcg	1.4	/* ---------------------------------------- */
305			fd = open ("/dev/tty", O_WRONLY);
306			if (fd < 0)
307			return -1; /* fatal */
308			close (fd);
309			/* ---------------------------------------- */
310	pcg	1.1	#endif /* ! __QNX__ */
311	pcg	1.4
312			return 0;
313	pcg	1.1	}
314	root	1.16
315			#ifndef NO_SETOWNER_TTYDEV
316			static struct ttyconf {
317			gid_t gid;
318			mode_t mode;
319
320			ttyconf ()
321			{
322			#ifdef TTY_GID_SUPPORT
323			struct group *gr = getgrnam ("tty");
324
325			if (gr)
326			{ /* change group ownership of tty to "tty" */
327			mode = S_IRUSR \| S_IWUSR \| S_IWGRP;
328			gid = gr->gr_gid;
329			}
330			else
331			#endif /* TTY_GID_SUPPORT */
332			{
333			mode = S_IRUSR \| S_IWUSR \| S_IWGRP \| S_IWOTH;
334			gid = getgid ();
335			}
336			}
337			} ttyconf;
338
339			void
340			rxvt_ptytty::privileges (rxvt_privaction action)
341			{
342	root	1.26	if (!name \|\| !*name)
343	root	1.23	return;
344
345	root	1.16	rxvt_privileges (RESTORE);
346
347			if (action == SAVE)
348			{
349			# ifndef RESET_TTY_TO_COMMON_DEFAULTS
350			/* store original tty status for restoration rxvt_clean_exit () -- rgg 04/12/95 */
351			if (lstat (name, &savestat) < 0) /* you lose out */
352	root	1.26	;
353	root	1.16	else
354			# endif
355			{
356	root	1.26	saved = true;
357	root	1.16	chown (name, getuid (), ttyconf.gid); /* fail silently */
358			chmod (name, ttyconf.mode);
359			# ifdef HAVE_REVOKE
360			revoke (name);
361			# endif
362			}
363			}
364			else
365			{ /* action == RESTORE */
366			# ifndef RESET_TTY_TO_COMMON_DEFAULTS
367	root	1.26	if (saved)
368			{
369			chmod (name, savestat.st_mode);
370			chown (name, savestat.st_uid, savestat.st_gid);
371			}
372	root	1.16	# else
373			chmod (name, (S_IRUSR \| S_IWUSR \| S_IRGRP \| S_IWGRP \| S_IROTH \| S_IWOTH));
374			chown (name, 0, 0);
375			# endif
376
377			}
378
379			rxvt_privileges (IGNORE);
380			}
381			#endif
382
383			rxvt_ptytty::rxvt_ptytty ()
384			{
385			pty = tty = -1;
386			name = 0;
387	root	1.26	#ifndef NO_SETOWNER_TTYDEV
388			saved = false;
389			#endif
390	root	1.16	}
391
392			rxvt_ptytty::~rxvt_ptytty ()
393			{
394			put ();
395			}
396
397			void
398
399			rxvt_ptytty::close_tty ()
400			{
401	root	1.29	if (tty < 0)
402			return;
403
404			close (tty);
405	root	1.16	tty = -1;
406			}
407
408			void
409			rxvt_ptytty::put ()
410			{
411			#ifndef NO_SETOWNER_TTYDEV
412	root	1.28	privileges (RESTORE);
413	root	1.16	#endif
414
415			if (pty >= 0) close (pty);
416			close_tty ();
417			free (name);
418
419			pty = tty = -1;
420			name = 0;
421			}
422
423			bool
424			rxvt_ptytty::make_controlling_tty ()
425			{
426			return control_tty (tty, name) >= 0;
427			}
428
429			bool
430			rxvt_ptytty::get ()
431			{
432			/* get master (pty) */
433			if ((pty = get_pty (&tty, &name)) < 0)
434			return false;
435
436			fcntl (pty, F_SETFL, O_NONBLOCK);
437
438			/* get slave (tty) */
439			if (tty < 0)
440			{
441			#ifndef NO_SETOWNER_TTYDEV
442			privileges (SAVE);
443			#endif
444
445			if ((tty = get_tty (name)) < 0)
446			{
447			put ();
448			return false;
449			}
450			}
451
452			return true;
453			}
454
455	root	1.22	void
456			rxvt_ptytty::set_utf8_mode (bool on)
457			{
458			#ifdef IUTF8
459	root	1.29	if (pty < 0)
460			return;
461
462			struct termios tio;
463
464			if (tcgetattr (pty, &tio) != -1)
465	root	1.22	{
466	root	1.29	tcflag_t new_cflag = tio.c_iflag;
467
468			if (on)
469			new_cflag \|= IUTF8;
470			else
471			new_cflag &= ~IUTF8;
472	root	1.22
473	root	1.29	if (new_cflag != tio.c_iflag)
474	root	1.22	{
475	root	1.29	tio.c_iflag = new_cflag;
476			tcsetattr (pty, TCSANOW, &tio);
477	root	1.22	}
478			}
479			#endif
480			}
481
482	pcg	1.1	/----------------------- end-of-file (C source) -----------------------/
483	root	1.16