libptytty/src/ptytty.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 <schmorp@schmorp.de>
 * Copyright (c) 2006      Emanuele Giaquinta <e.giaquinta@glauco.it>
 *
 * 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"

#include "ptytty.h"

#include <stdlib.h>
#include <cstdio>
#include <cstring>

#include <sys/types.h>
#include <sys/stat.h>
#include <unistd.h>
#include <fcntl.h>

#ifdef HAVE_SYS_IOCTL_H
# include <sys/ioctl.h>
#endif
#if defined(HAVE_SYS_STROPTS_H)
# include <sys/stropts.h>      /* for I_PUSH */
#endif
#if defined(HAVE_ISASTREAM) && defined(HAVE_STROPTS_H)
# 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
#ifdef TTY_GID_SUPPORT
#include <grp.h>
#endif

#ifndef O_NOCTTY
# define O_NOCTTY 0
#endif

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

/* ------------------------------------------------------------------------- *
 *                  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
 */
#if defined(UNIX98_PTY)

  static int
  get_pty (int *fd_tty, char **ttydev)
  {
    int pfd;

# if defined(HAVE_GETPT)
    pfd = getpt ();
# elif defined(HAVE_POSIX_OPENPT)
    pfd = posix_openpt (O_RDWR | O_NOCTTY);
# else
#  ifdef _AIX
    pfd = open ("/dev/ptc", O_RDWR | O_NOCTTY, 0);
#  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);
      }

    return -1;
  }

#elif defined(HAVE_OPENPTY)

  static int
  get_pty (int *fd_tty, char **ttydev)
  {
    int pfd;
    int res;

    res = openpty (&pfd, fd_tty, NULL, NULL, NULL);

    if (res != -1)
      {
        *ttydev = strdup (ttyname (*fd_tty));
        return pfd;
      }

    return -1;
  }

#elif defined(HAVE__GETPTY)

  static int
  get_pty (int *fd_tty, char **ttydev)
  {
    int pfd;
    char *slave;

    slave = _getpty (&pfd, O_RDWR | O_NOCTTY, 0622, 0);

    if (slave != NULL)
      {
        *ttydev = strdup (slave);
        return pfd;
      }

    return -1;
  }

#else

  /* Based on the code in openssh/openbsd-compat/bsd-openpty.c */
  static int
  get_pty (int *fd_tty, char **ttydev)
  {
    int pfd;
    int i;
    char pty_name[32];
    char tty_name[32];
    const char *majors = "pqrstuvwxyzabcde";
    const char *minors = "0123456789abcdef";

    for (i = 0; i < 256; i++)
      {
        snprintf (pty_name, 32, "/dev/pty%c%c", majors[i / 16], minors[i % 16]);
        snprintf (tty_name, 32, "/dev/tty%c%c", majors[i / 16], minors[i % 16]);

        if ((pfd = open (pty_name, O_RDWR | O_NOCTTY, 0)) == -1)
          {
            snprintf (pty_name, 32, "/dev/ptyp%d", i);
            snprintf (tty_name, 32, "/dev/ttyp%d", i);
            if ((pfd = open (pty_name, O_RDWR | O_NOCTTY, 0)) == -1)
              continue;
          }

        if (access (tty_name, R_OK | W_OK) == 0)
          {
            *ttydev = strdup (tty_name);
            return pfd;
          }

        close (pfd);
      }

    return -1;
  }

#endif

/*----------------------------------------------------------------------*/
/*
 * 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)
{
  int fd;

  setsid ();

#ifdef TIOCSCTTY
  ioctl (fd_tty, TIOCSCTTY, NULL);
#else
  fd = open (ttyname (fd_tty), O_RDWR);
  if (fd >= 0)
    close (fd);
#endif

  fd = open ("/dev/tty", O_WRONLY);
  if (fd < 0)
    return -1; /* fatal */

  close (fd);

  return 0;
}

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

  close (tty);
  tty = -1;
}

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

void
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
}

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 = 0;
        }
    }
} ttyconf;

ptytty_unix::ptytty_unix ()
{
  name = 0;
#if UTMP_SUPPORT
  cmd_pid = 0;
#endif
}

ptytty_unix::~ptytty_unix ()
{
#if UTMP_SUPPORT
  logout ();
#endif
  put ();
}

void
ptytty_unix::put ()
{
  if (name)
    {
      chmod (name, RESTORE_TTY_MODE);
      chown (name, 0, ttyconf.gid);
    }

  close_tty ();

  if (pty >= 0)
    close (pty);

  free (name);

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

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

  /* get slave (tty) */
  if (tty < 0)
    {
#ifndef NO_SETOWNER_TTYDEV
      chown (name, getuid (), ttyconf.gid);      /* fail silently */
      chmod (name, ttyconf.mode);
# ifdef HAVE_REVOKE
      revoke (name);
# endif
#endif

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

#if 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
   * 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
   */
#if defined(HAVE_ISASTREAM) && defined(HAVE_STROPTS_H)
  if (isastream (tty) == 1)
# endif
    {
      ioctl (tty, I_PUSH, "ptem");
      ioctl (tty, I_PUSH, "ldterm");
      ioctl (tty, I_PUSH, "ttcompat");
    }
#endif

#if UTMP_SUPPORT
# if defined(HAVE_STRUCT_UTMP) && !defined(HAVE_UTMP_PID)
  int fd_stdin = dup (STDIN_FILENO);
  dup2 (tty, STDIN_FILENO);

  utmp_pos = ttyslot ();

  dup2 (fd_stdin, STDIN_FILENO);
  close (fd_stdin);
# endif
#endif

  return true;
}

Revision:	1.49
Committed:	Wed Jan 18 20:05:13 2012 UTC (12 years, 5 months ago) by sf-exg
Content type:	text/plain
Branch:	MAIN
Changes since 1.48:	+1 -1 lines
Log Message:	Fix compilation on solaris.
#	User	Rev	Content
1	root	1.8	/----------------------------------------------------------------------
2	root	1.1	* File: ptytty.C
3			----------------------------------------------------------------------
4			*
5			* All portions of code are copyright by their respective author/s.
6			* Copyright (c) 1999-2001 Geoff Wing <gcw@pobox.com>
7	sf-exg	1.38	* Copyright (c) 2004-2006 Marc Lehmann <schmorp@schmorp.de>
8	root	1.12	* Copyright (c) 2006 Emanuele Giaquinta <e.giaquinta@glauco.it>
9	root	1.1	*
10			* This program is free software; you can redistribute it and/or modify
11			* it under the terms of the GNU General Public License as published by
12			* the Free Software Foundation; either version 2 of the License, or
13			* (at your option) any later version.
14			*
15			* This program is distributed in the hope that it will be useful,
16			* but WITHOUT ANY WARRANTY; without even the implied warranty of
17			* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
18			* GNU General Public License for more details.
19			*
20			* You should have received a copy of the GNU General Public License
21			* along with this program; if not, write to the Free Software
22			* Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
23			---------------------------------------------------------------------/
24
25	sf-exg	1.36	#include "config.h"
26	root	1.1
27	root	1.3	#include "ptytty.h"
28
29	sf-exg	1.49	#include <stdlib.h>
30	sf-exg	1.46	#include <cstdio>
31	root	1.2	#include <cstring>
32
33			#include <sys/types.h>
34	ayin	1.34	#include <sys/stat.h>
35	root	1.2	#include <unistd.h>
36			#include <fcntl.h>
37
38	root	1.1	#ifdef HAVE_SYS_IOCTL_H
39			# include <sys/ioctl.h>
40			#endif
41	sf-exg	1.40	#if defined(HAVE_SYS_STROPTS_H)
42	root	1.1	# include <sys/stropts.h> /* for I_PUSH */
43			#endif
44	root	1.35	#if defined(HAVE_ISASTREAM) && defined(HAVE_STROPTS_H)
45	root	1.1	# include <stropts.h>
46			#endif
47	root	1.2	#if defined(HAVE_PTY_H)
48	root	1.1	# include <pty.h>
49	root	1.2	#elif defined(HAVE_LIBUTIL_H)
50	root	1.1	# include <libutil.h>
51	root	1.2	#elif defined(HAVE_UTIL_H)
52	root	1.1	# include <util.h>
53			#endif
54	root	1.2	#ifdef TTY_GID_SUPPORT
55			#include <grp.h>
56			#endif
57	root	1.1
58	sf-exg	1.47	#ifndef O_NOCTTY
59			# define O_NOCTTY 0
60			#endif
61
62	root	1.2	/////////////////////////////////////////////////////////////////////////////
63	root	1.1
64			/* ------------------------------------------------------------------------- *
65			* GET PSEUDO TELETYPE - MASTER AND SLAVE *
66			* ------------------------------------------------------------------------- */
67			/*
68	ayin	1.26	* Returns pty file descriptor, or -1 on failure
69	root	1.1	* If successful, ttydev is set to the name of the slave device.
70			* fd_tty _may_ also be set to an open fd to the slave device
71			*/
72	root	1.2	#if defined(UNIX98_PTY)
73	root	1.25
74			static int
75			get_pty (int fd_tty, char *ttydev)
76			{
77			int pfd;
78	root	1.1
79	root	1.2	# if defined(HAVE_GETPT)
80	sf-exg	1.43	pfd = getpt ();
81	root	1.2	# elif defined(HAVE_POSIX_OPENPT)
82	sf-exg	1.41	pfd = posix_openpt (O_RDWR \| O_NOCTTY);
83	root	1.2	# else
84	sf-exg	1.40	# ifdef _AIX
85			pfd = open ("/dev/ptc", O_RDWR \| O_NOCTTY, 0);
86			# else
87			pfd = open ("/dev/ptmx", O_RDWR \| O_NOCTTY, 0);
88			# endif
89	root	1.2	# endif
90	root	1.1
91	root	1.25	if (pfd >= 0)
92			{
93			if (grantpt (pfd) == 0 /* change slave permissions */
94			&& unlockpt (pfd) == 0)
95	ayin	1.32	{
96			/* slave now unlocked */
97	root	1.25	ttydev = strdup (ptsname (pfd)); / get slave's name */
98			return pfd;
99			}
100
101			close (pfd);
102			}
103
104			return -1;
105			}
106	root	1.2
107			#elif defined(HAVE_OPENPTY)
108	root	1.1
109	root	1.25	static int
110			get_pty (int fd_tty, char *ttydev)
111			{
112			int pfd;
113			int res;
114	ayin	1.26
115	ayin	1.29	res = openpty (&pfd, fd_tty, NULL, NULL, NULL);
116	root	1.25
117			if (res != -1)
118			{
119	ayin	1.29	ttydev = strdup (ttyname (fd_tty));
120	root	1.25	return pfd;
121			}
122
123			return -1;
124			}
125
126	root	1.2	#elif defined(HAVE__GETPTY)
127
128	root	1.25	static int
129			get_pty (int fd_tty, char *ttydev)
130			{
131			int pfd;
132	ayin	1.30	char *slave;
133	root	1.25
134	sf-exg	1.42	slave = _getpty (&pfd, O_RDWR \| O_NOCTTY, 0622, 0);
135	root	1.25
136	ayin	1.33	if (slave != NULL)
137			{
138			*ttydev = strdup (slave);
139			return pfd;
140			}
141	root	1.25
142			return -1;
143			}
144	root	1.1
145	root	1.2	#else
146	root	1.1
147	root	1.25	/* Based on the code in openssh/openbsd-compat/bsd-openpty.c */
148			static int
149			get_pty (int fd_tty, char *ttydev)
150			{
151			int pfd;
152			int i;
153			char pty_name[32];
154			char tty_name[32];
155			const char *majors = "pqrstuvwxyzabcde";
156			const char *minors = "0123456789abcdef";
157
158			for (i = 0; i < 256; i++)
159			{
160	sf-exg	1.43	snprintf (pty_name, 32, "/dev/pty%c%c", majors[i / 16], minors[i % 16]);
161			snprintf (tty_name, 32, "/dev/tty%c%c", majors[i / 16], minors[i % 16]);
162	root	1.25
163			if ((pfd = open (pty_name, O_RDWR \| O_NOCTTY, 0)) == -1)
164			{
165	sf-exg	1.43	snprintf (pty_name, 32, "/dev/ptyp%d", i);
166			snprintf (tty_name, 32, "/dev/ttyp%d", i);
167	root	1.25	if ((pfd = open (pty_name, O_RDWR \| O_NOCTTY, 0)) == -1)
168			continue;
169			}
170
171			if (access (tty_name, R_OK \| W_OK) == 0)
172			{
173			*ttydev = strdup (tty_name);
174			return pfd;
175			}
176
177			close (pfd);
178			}
179
180			return -1;
181			}
182	ayin	1.24
183	root	1.1	#endif
184
185			/----------------------------------------------------------------------/
186			/*
187	ayin	1.26	* Returns tty file descriptor, or -1 on failure
188	root	1.1	*/
189			static int
190			get_tty (char *ttydev)
191			{
192			return open (ttydev, O_RDWR \| O_NOCTTY, 0);
193			}
194
195			/----------------------------------------------------------------------/
196			/*
197			* Make our tty a controlling tty so that /dev/tty points to us
198			*/
199			static int
200	root	1.2	control_tty (int fd_tty)
201	root	1.1	{
202	ayin	1.28	int fd;
203
204	root	1.1	setsid ();
205
206	ayin	1.27	#ifdef TIOCSCTTY
207	root	1.2	ioctl (fd_tty, TIOCSCTTY, NULL);
208	ayin	1.27	#else
209	ayin	1.28	fd = open (ttyname (fd_tty), O_RDWR);
210	ayin	1.27	if (fd >= 0)
211			close (fd);
212			#endif
213	root	1.2
214	ayin	1.28	fd = open ("/dev/tty", O_WRONLY);
215	root	1.1	if (fd < 0)
216	root	1.10	return -1; /* fatal */
217	root	1.2
218	root	1.1	close (fd);
219
220			return 0;
221			}
222
223	root	1.2	void
224	root	1.4	ptytty::close_tty ()
225	root	1.2	{
226			if (tty < 0)
227			return;
228
229			close (tty);
230			tty = -1;
231			}
232
233			bool
234	root	1.4	ptytty::make_controlling_tty ()
235	root	1.2	{
236			return control_tty (tty) >= 0;
237			}
238
239			void
240	root	1.4	ptytty::set_utf8_mode (bool on)
241	root	1.2	{
242			#ifdef IUTF8
243			if (pty < 0)
244			return;
245
246			struct termios tio;
247
248			if (tcgetattr (pty, &tio) != -1)
249			{
250			tcflag_t new_cflag = tio.c_iflag;
251
252			if (on)
253			new_cflag \|= IUTF8;
254			else
255			new_cflag &= ~IUTF8;
256
257			if (new_cflag != tio.c_iflag)
258			{
259			tio.c_iflag = new_cflag;
260			tcsetattr (pty, TCSANOW, &tio);
261			}
262			}
263			#endif
264			}
265
266	root	1.1	static struct ttyconf {
267			gid_t gid;
268			mode_t mode;
269
270			ttyconf ()
271			{
272			#ifdef TTY_GID_SUPPORT
273			struct group *gr = getgrnam ("tty");
274
275			if (gr)
276	ayin	1.32	{
277			/* change group ownership of tty to "tty" */
278	root	1.1	mode = S_IRUSR \| S_IWUSR \| S_IWGRP;
279			gid = gr->gr_gid;
280			}
281			else
282	ayin	1.31	#endif /* TTY_GID_SUPPORT */
283	root	1.1	{
284			mode = S_IRUSR \| S_IWUSR \| S_IWGRP \| S_IWOTH;
285	root	1.2	gid = 0;
286	root	1.1	}
287			}
288			} ttyconf;
289
290	root	1.4	ptytty_unix::ptytty_unix ()
291	root	1.1	{
292			name = 0;
293	root	1.2	#if UTMP_SUPPORT
294			cmd_pid = 0;
295	root	1.1	#endif
296			}
297
298	root	1.4	ptytty_unix::~ptytty_unix ()
299	root	1.1	{
300	root	1.2	#if UTMP_SUPPORT
301			logout ();
302			#endif
303	root	1.1	put ();
304			}
305
306			void
307	root	1.4	ptytty_unix::put ()
308	root	1.2	{
309	root	1.25	if (name)
310			{
311			chmod (name, RESTORE_TTY_MODE);
312			chown (name, 0, ttyconf.gid);
313			}
314	root	1.1
315	root	1.2	close_tty ();
316	root	1.1
317	root	1.2	if (pty >= 0)
318			close (pty);
319	root	1.1
320			free (name);
321
322			pty = tty = -1;
323			name = 0;
324			}
325
326			bool
327	root	1.4	ptytty_unix::get ()
328	root	1.1	{
329			/* get master (pty) */
330			if ((pty = get_pty (&tty, &name)) < 0)
331			return false;
332
333			/* get slave (tty) */
334			if (tty < 0)
335			{
336			#ifndef NO_SETOWNER_TTYDEV
337	root	1.2	chown (name, getuid (), ttyconf.gid); /* fail silently */
338			chmod (name, ttyconf.mode);
339			# ifdef HAVE_REVOKE
340			revoke (name);
341			# endif
342	root	1.1	#endif
343
344			if ((tty = get_tty (name)) < 0)
345			{
346			put ();
347			return false;
348			}
349			}
350
351	sf-exg	1.40	#if defined(I_PUSH)
352	sf-exg	1.39	/*
353			* Push STREAMS modules:
354			* ptem: pseudo-terminal hardware emulation module.
355			* ldterm: standard terminal line discipline.
356			* ttcompat: V7, 4BSD and XENIX STREAMS compatibility module.
357			*
358			* After we push the STREAMS modules, the first open () on the slave side
359			* should make the "ptem" (or "ldterm" depending upon either which OS
360			* version or which set of manual pages you have) module give us a
361			* controlling terminal. We must already have close ()d the master side
362			* fd in this child process before we push STREAMS modules on because the
363			* documentation is really unclear about whether it is any close () on
364			* the master side or the last close () - i.e. a proper STREAMS dismantling
365			* close () - on the master side which causes a hang up to be sent
366			* through - Geoff Wing
367			*/
368			#if defined(HAVE_ISASTREAM) && defined(HAVE_STROPTS_H)
369			if (isastream (tty) == 1)
370			# endif
371			{
372			ioctl (tty, I_PUSH, "ptem");
373			ioctl (tty, I_PUSH, "ldterm");
374			ioctl (tty, I_PUSH, "ttcompat");
375			}
376			#endif
377
378	sf-exg	1.44	#if UTMP_SUPPORT
379			# if defined(HAVE_STRUCT_UTMP) && !defined(HAVE_UTMP_PID)
380			int fd_stdin = dup (STDIN_FILENO);
381			dup2 (tty, STDIN_FILENO);
382
383			utmp_pos = ttyslot ();
384
385			dup2 (fd_stdin, STDIN_FILENO);
386			close (fd_stdin);
387			# endif
388			#endif
389
390	root	1.1	return true;
391			}
392