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>

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

#ifdef HAVE_SYS_IOCTL_H
# include <sys/ioctl.h>
#endif
#if defined(HAVE_DEV_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
#ifdef TTY_GID_SUPPORT
#include <grp.h>
#endif

#include <cstdio>

#include "rxvtutil.h"
#include "fdpass.h"
#include "ptytty.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
 */
#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);
# else
  pfd = open (CLONE_DEVICE, 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);
    }

  return -1;
}
#elif defined(HAVE_OPENPTY)
static int
get_pty (int *fd_tty, char **ttydev)
{
  int pfd;
  int res;
  char tty_name[32];
  
  res = openpty (&pfd, fd_tty, tty_name, NULL, NULL);
  if (res != -1)
    {
      *ttydev = strdup (tty_name);
      return pfd;
    }

  return -1;
}
#elif defined(HAVE__GETPTY)
static int
get_pty (int *fd_tty, char **ttydev)
{
  int pfd;

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

  return -1;
}
#elif defined(HAVE_DEV_PTC)
static int
get_pty (int *fd_tty, char **ttydev)
{
  int pfd;

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

  return -1;
}
#elif defined(HAVE_DEV_CLONE)
static int
get_pty (int *fd_tty, char **ttydev)
{
  int pfd;

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

#if defined(HAVE_DEV_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

  ioctl (fd_tty, TIOCSCTTY, NULL);

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

  close (fd);

  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
}

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;

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

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

void
rxvt_ptytty_unix::put ()
{
  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
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
      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;
        }
    }

  return true;
}

#if PTYTTY_HELPER

static int sock_fd;
static int pid;

struct command
{
  enum { get, login, destroy } type;

  rxvt_ptytty *id;

  bool login_shell;
  int cmd_pid;
  char hostname[512]; // arbitrary, but should be plenty
};

struct rxvt_ptytty_proxy : zero_initialized, rxvt_ptytty
{
  rxvt_ptytty *id;

  ~rxvt_ptytty_proxy ();

  bool get ();
  void login (int cmd_pid, bool login_shell, const char *hostname);
};

bool
rxvt_ptytty_proxy::get ()
{
  command cmd;

  cmd.type = command::get;

  write (sock_fd, &cmd, sizeof (cmd));

  if (read (sock_fd, &id, sizeof (id)) != sizeof (id))
    rxvt_fatal ("protocol error while creating pty using helper process, aborting.\n");

  if (!id)
    return false;

  if ((pty = rxvt_recv_fd (sock_fd)) < 0
      || (tty = rxvt_recv_fd (sock_fd)) < 0)
    rxvt_fatal ("protocol error while reading pty/tty fds from helper process, aborting.\n");

  return true;
}

void
rxvt_ptytty_proxy::login (int cmd_pid, bool login_shell, const char *hostname)
{
  command cmd;

  cmd.type = command::login;
  cmd.id = id;
  cmd.cmd_pid = cmd_pid;
  cmd.login_shell = login_shell;
  strncpy (cmd.hostname, hostname, sizeof (cmd.hostname));

  write (sock_fd, &cmd, sizeof (cmd));
}

rxvt_ptytty_proxy::~rxvt_ptytty_proxy ()
{
  command cmd;

  cmd.type = command::destroy;
  cmd.id = id;

  write (sock_fd, &cmd, sizeof (cmd));
}

static
void serve ()
{
  command cmd;
  vector<rxvt_ptytty *> ptys;

  while (read (sock_fd, &cmd, sizeof (command)) == sizeof (command))
    {
      if (cmd.type == command::get)
        {
          // -> id ptyfd ttyfd
          cmd.id = new rxvt_ptytty_unix;

          if (cmd.id->get ())
            {
              write (sock_fd, &cmd.id, sizeof (cmd.id));
              ptys.push_back (cmd.id);

              rxvt_send_fd (sock_fd, cmd.id->pty);
              rxvt_send_fd (sock_fd, cmd.id->tty);
            }
          else
            {
              delete cmd.id;
              cmd.id = 0;
              write (sock_fd, &cmd.id, sizeof (cmd.id));
            }
        }
      else if (cmd.type == command::login)
        {
#if UTMP_SUPPORT
          if (find (ptys.begin (), ptys.end (), cmd.id))
            {
              cmd.hostname[sizeof (cmd.hostname) - 1] = 0;
              cmd.id->login (cmd.cmd_pid, cmd.login_shell, cmd.hostname);
            }
#endif
        }
      else if (cmd.type == command::destroy)
        {
          rxvt_ptytty **pty = find (ptys.begin (), ptys.end (), cmd.id);

          if (pty)
            {
              delete *pty;
              ptys.erase (pty);
            }
        }
      else
        break;
    }

  // destroy all ptys
  for (rxvt_ptytty **i = ptys.end (); i-- > ptys.begin (); )
    delete *i;
}

void rxvt_ptytty_server ()
{
  int sv[2];

  if (socketpair (AF_UNIX, SOCK_STREAM, 0, sv))
    rxvt_fatal ("could not create socket to communicate with pty/sessiondb helper, aborting.\n");

  pid = fork ();

  if (pid < 0)
    rxvt_fatal ("could not create pty/sessiondb helper process, aborting.\n");

  if (pid)
    {
      // client, urxvt
      sock_fd = sv[0];
      close (sv[1]);
      fcntl (sock_fd, F_SETFD, FD_CLOEXEC);
    }
  else
    {
      // server, pty-helper
      sock_fd = sv[1];

      for (int fd = 0; fd < 1023; fd++)
        if (fd != sock_fd)
          close (fd);

      serve ();
      _exit (EXIT_SUCCESS);
    }
}

#endif

// a "factory" *g*
rxvt_ptytty *
rxvt_new_ptytty ()
{
#if PTYTTY_HELPER
  if (pid > 0)
    // use helper process
    return new rxvt_ptytty_proxy;
  else
#endif
    return new rxvt_ptytty_unix;
}

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

Revision:	1.53
Committed:	Sat Jan 21 18:15:26 2006 UTC (18 years, 4 months ago) by ayin
Content type:	text/plain
Branch:	MAIN
Changes since 1.52:	+46 -122 lines
Log Message:	* empty log message *
#	Content
1	/---------------------------------C----------------------------------
2	* 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	* Copyright (c) 2004-2006 Marc Lehmann <pcg@goof.com>
8	*
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	#include "rxvt.h"
26
27	#include <cstdlib>
28	#include <cstring>
29
30	#include <sys/types.h>
31	#include <sys/socket.h>
32	#include <unistd.h>
33	#include <fcntl.h>
34
35	#ifdef HAVE_SYS_IOCTL_H
36	# include <sys/ioctl.h>
37	#endif
38	#if defined(HAVE_DEV_PTMX) && defined(HAVE_SYS_STROPTS_H)
39	# include <sys/stropts.h> /* for I_PUSH */
40	#endif
41	#ifdef HAVE_ISASTREAM
42	# include <stropts.h>
43	#endif
44	#if defined(HAVE_PTY_H)
45	# include <pty.h>
46	#elif defined(HAVE_LIBUTIL_H)
47	# include <libutil.h>
48	#elif defined(HAVE_UTIL_H)
49	# include <util.h>
50	#endif
51	#ifdef TTY_GID_SUPPORT
52	#include <grp.h>
53	#endif
54
55	#include <cstdio>
56
57	#include "rxvtutil.h"
58	#include "fdpass.h"
59	#include "ptytty.h"
60
61	/////////////////////////////////////////////////////////////////////////////
62
63	/* ------------------------------------------------------------------------- *
64	* GET PSEUDO TELETYPE - MASTER AND SLAVE *
65	* ------------------------------------------------------------------------- */
66	/*
67	* Returns pty file descriptor, or -1 on failure
68	* If successful, ttydev is set to the name of the slave device.
69	* fd_tty _may_ also be set to an open fd to the slave device
70	*/
71	#if defined(UNIX98_PTY)
72	static int
73	get_pty (int fd_tty, char *ttydev)
74	{
75	int pfd;
76
77	# if defined(HAVE_GETPT)
78	pfd = getpt();
79	# elif defined(HAVE_POSIX_OPENPT)
80	pfd = posix_openpt (O_RDWR);
81	# else
82	pfd = open (CLONE_DEVICE, O_RDWR \| O_NOCTTY, 0);
83	# endif
84	if (pfd >= 0)
85	{
86	if (grantpt (pfd) == 0 /* change slave permissions */
87	&& unlockpt (pfd) == 0)
88	{ /* slave now unlocked */
89	ttydev = strdup (ptsname (pfd)); / get slave's name */
90	return pfd;
91	}
92
93	close (pfd);
94	}
95
96	return -1;
97	}
98	#elif defined(HAVE_OPENPTY)
99	static int
100	get_pty (int fd_tty, char *ttydev)
101	{
102	int pfd;
103	int res;
104	char tty_name[32];
105
106	res = openpty (&pfd, fd_tty, tty_name, NULL, NULL);
107	if (res != -1)
108	{
109	*ttydev = strdup (tty_name);
110	return pfd;
111	}
112
113	return -1;
114	}
115	#elif defined(HAVE__GETPTY)
116	static int
117	get_pty (int fd_tty, char *ttydev)
118	{
119	int pfd;
120
121	*ttydev = _getpty (&pfd, O_RDWR \| O_NONBLOCK \| O_NOCTTY, 0622, 0);
122	if (*ttydev != NULL)
123	return pfd;
124
125	return -1;
126	}
127	#elif defined(HAVE_DEV_PTC)
128	static int
129	get_pty (int fd_tty, char *ttydev)
130	{
131	int pfd;
132
133	if ((pfd = open ("/dev/ptc", O_RDWR \| O_NOCTTY, 0)) >= 0)
134	{
135	*ttydev = strdup (ttyname (pfd));
136	return pfd;
137	}
138
139	return -1;
140	}
141	#elif defined(HAVE_DEV_CLONE)
142	static int
143	get_pty (int fd_tty, char *ttydev)
144	{
145	int pfd;
146
147	if ((pfd = open ("/dev/ptym/clone", O_RDWR \| O_NOCTTY, 0)) >= 0)
148	{
149	*ttydev = strdup (ptsname (pfd));
150	return pfd;
151	}
152
153	return -1;
154	}
155	#else
156	/* Based on the code in openssh/openbsd-compat/bsd-openpty.c */
157	static int
158	get_pty (int fd_tty, char *ttydev)
159	{
160	int pfd;
161	int i;
162	char pty_name[32];
163	char tty_name[32];
164	const char *majors = "pqrstuvwxyzabcde";
165	const char *minors = "0123456789abcdef";
166	for (i = 0; i < 256; i++)
167	{
168	snprintf(pty_name, 32, "/dev/pty%c%c", majors[i / 16], minors[i % 16]);
169	snprintf(tty_name, 32, "/dev/tty%c%c", majors[i / 16], minors[i % 16]);
170	if ((pfd = open (pty_name, O_RDWR \| O_NOCTTY, 0)) == -1)
171	{
172	snprintf(pty_name, 32, "/dev/ptyp%d", i);
173	snprintf(tty_name, 32, "/dev/ttyp%d", i);
174	if ((pfd = open (pty_name, O_RDWR \| O_NOCTTY, 0)) == -1)
175	continue;
176	}
177	if (access (tty_name, R_OK \| W_OK) == 0)
178	{
179	*ttydev = strdup (tty_name);
180	return pfd;
181	}
182
183	close (pfd);
184	}
185	}
186	#endif
187
188	/----------------------------------------------------------------------/
189	/*
190	* Returns tty file descriptor, or -1 on failure
191	*/
192	static int
193	get_tty (char *ttydev)
194	{
195	return open (ttydev, O_RDWR \| O_NOCTTY, 0);
196	}
197
198	/----------------------------------------------------------------------/
199	/*
200	* Make our tty a controlling tty so that /dev/tty points to us
201	*/
202	static int
203	control_tty (int fd_tty)
204	{
205	setsid ();
206
207	#if defined(HAVE_DEV_PTMX) && defined(I_PUSH)
208	/*
209	* Push STREAMS modules:
210	* ptem: pseudo-terminal hardware emulation module.
211	* ldterm: standard terminal line discipline.
212	* ttcompat: V7, 4BSD and XENIX STREAMS compatibility module.
213	*
214	* After we push the STREAMS modules, the first open () on the slave side
215	* (i.e. the next section between the dashes giving us "tty opened OK")
216	* should make the "ptem" (or "ldterm" depending upon either which OS
217	* version or which set of manual pages you have) module give us a
218	* controlling terminal. We must already have close ()d the master side
219	* fd in this child process before we push STREAMS modules on because the
220	* documentation is really unclear about whether it is any close () on
221	* the master side or the last close () - i.e. a proper STREAMS dismantling
222	* close () - on the master side which causes a hang up to be sent
223	* through - Geoff Wing
224	*/
225	# ifdef HAVE_ISASTREAM
226	if (isastream (fd_tty) == 1)
227	# endif
228	{
229	ioctl (fd_tty, I_PUSH, "ptem");
230	ioctl (fd_tty, I_PUSH, "ldterm");
231	ioctl (fd_tty, I_PUSH, "ttcompat");
232	}
233	#endif
234
235	ioctl (fd_tty, TIOCSCTTY, NULL);
236
237	int fd = open ("/dev/tty", O_WRONLY);
238	if (fd < 0)
239	return -1; /* fatal */
240
241	close (fd);
242
243	return 0;
244	}
245
246	void
247	rxvt_ptytty::close_tty ()
248	{
249	if (tty < 0)
250	return;
251
252	close (tty);
253	tty = -1;
254	}
255
256	bool
257	rxvt_ptytty::make_controlling_tty ()
258	{
259	return control_tty (tty) >= 0;
260	}
261
262	void
263	rxvt_ptytty::set_utf8_mode (bool on)
264	{
265	#ifdef IUTF8
266	if (pty < 0)
267	return;
268
269	struct termios tio;
270
271	if (tcgetattr (pty, &tio) != -1)
272	{
273	tcflag_t new_cflag = tio.c_iflag;
274
275	if (on)
276	new_cflag \|= IUTF8;
277	else
278	new_cflag &= ~IUTF8;
279
280	if (new_cflag != tio.c_iflag)
281	{
282	tio.c_iflag = new_cflag;
283	tcsetattr (pty, TCSANOW, &tio);
284	}
285	}
286	#endif
287	}
288
289	static struct ttyconf {
290	gid_t gid;
291	mode_t mode;
292
293	ttyconf ()
294	{
295	#ifdef TTY_GID_SUPPORT
296	struct group *gr = getgrnam ("tty");
297
298	if (gr)
299	{ /* change group ownership of tty to "tty" */
300	mode = S_IRUSR \| S_IWUSR \| S_IWGRP;
301	gid = gr->gr_gid;
302	}
303	else
304	#endif /* TTY_GID_SUPPORT */
305	{
306	mode = S_IRUSR \| S_IWUSR \| S_IWGRP \| S_IWOTH;
307	gid = 0;
308	}
309	}
310	} ttyconf;
311
312	rxvt_ptytty_unix::rxvt_ptytty_unix ()
313	{
314	name = 0;
315	#if UTMP_SUPPORT
316	cmd_pid = 0;
317	#endif
318	}
319
320	rxvt_ptytty_unix::~rxvt_ptytty_unix ()
321	{
322	#if UTMP_SUPPORT
323	logout ();
324	#endif
325	put ();
326	}
327
328	void
329	rxvt_ptytty_unix::put ()
330	{
331	chmod (name, RESTORE_TTY_MODE);
332	chown (name, 0, ttyconf.gid);
333
334	close_tty ();
335
336	if (pty >= 0)
337	close (pty);
338
339	free (name);
340
341	pty = tty = -1;
342	name = 0;
343	}
344
345	bool
346	rxvt_ptytty_unix::get ()
347	{
348	/* get master (pty) */
349	if ((pty = get_pty (&tty, &name)) < 0)
350	return false;
351
352	fcntl (pty, F_SETFL, O_NONBLOCK);
353
354	/* get slave (tty) */
355	if (tty < 0)
356	{
357	#ifndef NO_SETOWNER_TTYDEV
358	chown (name, getuid (), ttyconf.gid); /* fail silently */
359	chmod (name, ttyconf.mode);
360	# ifdef HAVE_REVOKE
361	revoke (name);
362	# endif
363	#endif
364
365	if ((tty = get_tty (name)) < 0)
366	{
367	put ();
368	return false;
369	}
370	}
371
372	return true;
373	}
374
375	#if PTYTTY_HELPER
376
377	static int sock_fd;
378	static int pid;
379
380	struct command
381	{
382	enum { get, login, destroy } type;
383
384	rxvt_ptytty *id;
385
386	bool login_shell;
387	int cmd_pid;
388	char hostname[512]; // arbitrary, but should be plenty
389	};
390
391	struct rxvt_ptytty_proxy : zero_initialized, rxvt_ptytty
392	{
393	rxvt_ptytty *id;
394
395	~rxvt_ptytty_proxy ();
396
397	bool get ();
398	void login (int cmd_pid, bool login_shell, const char *hostname);
399	};
400
401	bool
402	rxvt_ptytty_proxy::get ()
403	{
404	command cmd;
405
406	cmd.type = command::get;
407
408	write (sock_fd, &cmd, sizeof (cmd));
409
410	if (read (sock_fd, &id, sizeof (id)) != sizeof (id))
411	rxvt_fatal ("protocol error while creating pty using helper process, aborting.\n");
412
413	if (!id)
414	return false;
415
416	if ((pty = rxvt_recv_fd (sock_fd)) < 0
417	\|\| (tty = rxvt_recv_fd (sock_fd)) < 0)
418	rxvt_fatal ("protocol error while reading pty/tty fds from helper process, aborting.\n");
419
420	return true;
421	}
422
423	void
424	rxvt_ptytty_proxy::login (int cmd_pid, bool login_shell, const char *hostname)
425	{
426	command cmd;
427
428	cmd.type = command::login;
429	cmd.id = id;
430	cmd.cmd_pid = cmd_pid;
431	cmd.login_shell = login_shell;
432	strncpy (cmd.hostname, hostname, sizeof (cmd.hostname));
433
434	write (sock_fd, &cmd, sizeof (cmd));
435	}
436
437	rxvt_ptytty_proxy::~rxvt_ptytty_proxy ()
438	{
439	command cmd;
440
441	cmd.type = command::destroy;
442	cmd.id = id;
443
444	write (sock_fd, &cmd, sizeof (cmd));
445	}
446
447	static
448	void serve ()
449	{
450	command cmd;
451	vector<rxvt_ptytty *> ptys;
452
453	while (read (sock_fd, &cmd, sizeof (command)) == sizeof (command))
454	{
455	if (cmd.type == command::get)
456	{
457	// -> id ptyfd ttyfd
458	cmd.id = new rxvt_ptytty_unix;
459
460	if (cmd.id->get ())
461	{
462	write (sock_fd, &cmd.id, sizeof (cmd.id));
463	ptys.push_back (cmd.id);
464
465	rxvt_send_fd (sock_fd, cmd.id->pty);
466	rxvt_send_fd (sock_fd, cmd.id->tty);
467	}
468	else
469	{
470	delete cmd.id;
471	cmd.id = 0;
472	write (sock_fd, &cmd.id, sizeof (cmd.id));
473	}
474	}
475	else if (cmd.type == command::login)
476	{
477	#if UTMP_SUPPORT
478	if (find (ptys.begin (), ptys.end (), cmd.id))
479	{
480	cmd.hostname[sizeof (cmd.hostname) - 1] = 0;
481	cmd.id->login (cmd.cmd_pid, cmd.login_shell, cmd.hostname);
482	}
483	#endif
484	}
485	else if (cmd.type == command::destroy)
486	{
487	rxvt_ptytty **pty = find (ptys.begin (), ptys.end (), cmd.id);
488
489	if (pty)
490	{
491	delete *pty;
492	ptys.erase (pty);
493	}
494	}
495	else
496	break;
497	}
498
499	// destroy all ptys
500	for (rxvt_ptytty **i = ptys.end (); i-- > ptys.begin (); )
501	delete *i;
502	}
503
504	void rxvt_ptytty_server ()
505	{
506	int sv[2];
507
508	if (socketpair (AF_UNIX, SOCK_STREAM, 0, sv))
509	rxvt_fatal ("could not create socket to communicate with pty/sessiondb helper, aborting.\n");
510
511	pid = fork ();
512
513	if (pid < 0)
514	rxvt_fatal ("could not create pty/sessiondb helper process, aborting.\n");
515
516	if (pid)
517	{
518	// client, urxvt
519	sock_fd = sv[0];
520	close (sv[1]);
521	fcntl (sock_fd, F_SETFD, FD_CLOEXEC);
522	}
523	else
524	{
525	// server, pty-helper
526	sock_fd = sv[1];
527
528	for (int fd = 0; fd < 1023; fd++)
529	if (fd != sock_fd)
530	close (fd);
531
532	serve ();
533	_exit (EXIT_SUCCESS);
534	}
535	}
536
537	#endif
538
539	// a "factory" g
540	rxvt_ptytty *
541	rxvt_new_ptytty ()
542	{
543	#if PTYTTY_HELPER
544	if (pid > 0)
545	// use helper process
546	return new rxvt_ptytty_proxy;
547	else
548	#endif
549	return new rxvt_ptytty_unix;
550	}
551
552	/----------------------- end-of-file (C source) -----------------------/
553