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(PTYS_ARE_PTMX) && defined(HAVE_SYS_STROPTS_H)
# include <sys/stropts.h>      /* for I_PUSH */
#endif
#ifdef HAVE_ISASTREAM
# include <stropts.h>
#endif
#if defined(HAVE_PTY_H)
# include <pty.h>
#elif defined(HAVE_LIBUTIL_H)
# include <libutil.h>
#elif defined(HAVE_UTIL_H)
# include <util.h>
#endif

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

#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
 */
static inline int
get_pty_streams (int *fd_tty, char **ttydev)
{
#if defined(HAVE_GRANTPT) && defined(HAVE_UNLOCKPT)
# if defined(PTYS_ARE_GETPT) || defined(PTYS_ARE_POSIX) || defined(PTYS_ARE_PTMX)
  int pfd;

# if defined(PTYS_ARE_GETPT)
  pfd = getpt();
# elif defined(PTYS_ARE_POSIX)
  pfd = posix_openpt (O_RDWR);
# 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

  return -1;
}

static inline int
get_pty_openpty (int *fd_tty, char **ttydev)
{
#ifdef PTYS_ARE_OPENPTY
  int pfd;
  int res;
  char tty_name[sizeof "/dev/pts/????\0"];
  
  res = openpty (&pfd, fd_tty, tty_name, NULL, NULL);
  if (res != -1)
    {
      *ttydev = strdup (tty_name);
      return pfd;
    }
#endif

  return -1;
}

static inline int
get_pty__getpty (int *fd_tty, char **ttydev)
{
#ifdef PTYS_ARE__GETPTY
  int pfd;

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

  return -1;
}

static inline int
get_pty_ptc (int *fd_tty, char **ttydev)
{
#ifdef PTYS_ARE_PTC
  int pfd;

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

  return -1;
}

static inline int
get_pty_clone (int *fd_tty, char **ttydev)
{
#ifdef PTYS_ARE_CLONE
  int pfd;

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

  return -1;
}

static inline int
get_pty_numeric (int *fd_tty, char **ttydev)
{
#ifdef PTYS_ARE_NUMERIC
  int pfd;
  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

  return -1;
}

static inline int
get_pty_searched (int *fd_tty, char **ttydev)
{
#ifdef PTYS_ARE_SEARCHED
# ifndef PTYCHAR1
#  define PTYCHAR1      "pqrstuvwxyz"
# endif
# ifndef PTYCHAR2
#  define PTYCHAR2      "0123456789abcdef"
# endif
  int pfd;
  const char *c1, *c2;
  char pty_name[] = "/dev/pty??";
  char tty_name[] = "/dev/tty??";

  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;
}

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

  if ((pfd = get_pty_streams (fd_tty, ttydev)) != -1
      || (pfd = get_pty_openpty (fd_tty, ttydev)) != -1
      || (pfd = get_pty__getpty (fd_tty, ttydev)) != -1
      || (pfd = get_pty_ptc (fd_tty, ttydev)) != -1
      || (pfd = get_pty_clone (fd_tty, ttydev)) != -1
      || (pfd = get_pty_numeric (fd_tty, ttydev)) != -1
      || (pfd = get_pty_searched (fd_tty, ttydev)) != -1)
    return pfd;

  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)
{
  setsid ();

#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

  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 ()
{
  pty = tty = -1;
  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);

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

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

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

  fcntl (pty, F_SETFL, O_NONBLOCK);

  /* get slave (tty) */
  if (tty < 0)
    {
#ifndef NO_SETOWNER_TTYDEV
      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:	1.49
Committed:	Thu Jan 19 16:40:42 2006 UTC (18 years, 4 months ago) by ayin
Content type:	text/plain
Branch:	MAIN
Changes since 1.48:	+10 -32 lines
Log Message:	* empty log message *
#	User	Rev	Content
1	pcg	1.1	/---------------------------------C----------------------------------
2	pcg	1.11	* File: ptytty.C
3	pcg	1.1	----------------------------------------------------------------------
4			*
5			* All portions of code are copyright by their respective author/s.
6			* Copyright (c) 1999-2001 Geoff Wing <gcw@pobox.com>
7	root	1.30	* Copyright (c) 2004-2006 Marc Lehmann <pcg@goof.com>
8	pcg	1.1	*
9			* This program is free software; you can redistribute it and/or modify
10			* it under the terms of the GNU General Public License as published by
11			* the Free Software Foundation; either version 2 of the License, or
12			* (at your option) any later version.
13			*
14			* This program is distributed in the hope that it will be useful,
15			* but WITHOUT ANY WARRANTY; without even the implied warranty of
16			* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
17			* GNU General Public License for more details.
18			*
19			* You should have received a copy of the GNU General Public License
20			* along with this program; if not, write to the Free Software
21			* Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
22			---------------------------------------------------------------------/
23
24			#include "../config.h" /* NECESSARY */
25	root	1.16	#include "rxvt.h"
26	pcg	1.1
27	root	1.40	#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	root	1.31
35	pcg	1.1	#ifdef HAVE_SYS_IOCTL_H
36			# include <sys/ioctl.h>
37			#endif
38	root	1.12	#if defined(PTYS_ARE_PTMX) && defined(HAVE_SYS_STROPTS_H)
39	pcg	1.1	# include <sys/stropts.h> /* for I_PUSH */
40			#endif
41	pcg	1.10	#ifdef HAVE_ISASTREAM
42			# include <stropts.h>
43			#endif
44	root	1.31	#if defined(HAVE_PTY_H)
45	root	1.22	# include <pty.h>
46	root	1.31	#elif defined(HAVE_LIBUTIL_H)
47	root	1.16	# include <libutil.h>
48	root	1.31	#elif defined(HAVE_UTIL_H)
49	root	1.17	# include <util.h>
50	pcg	1.1	#endif
51
52	root	1.16	#include <cstdio>
53			#include <grp.h>
54
55	root	1.40	#include "rxvtutil.h"
56			#include "fdpass.h"
57	root	1.39	#include "ptytty.h"
58
59	root	1.36	/////////////////////////////////////////////////////////////////////////////
60
61	pcg	1.1	/* ------------------------------------------------------------------------- *
62			* GET PSEUDO TELETYPE - MASTER AND SLAVE *
63			* ------------------------------------------------------------------------- */
64			/*
65			* Returns pty file descriptor, or -1 on failure
66			* If successful, ttydev is set to the name of the slave device.
67			* fd_tty _may_ also be set to an open fd to the slave device
68			*/
69	ayin	1.44	static inline int
70			get_pty_streams (int fd_tty, char *ttydev)
71	pcg	1.1	{
72	ayin	1.49	#if defined(HAVE_GRANTPT) && defined(HAVE_UNLOCKPT)
73			# if defined(PTYS_ARE_GETPT) \|\| defined(PTYS_ARE_POSIX) \|\| defined(PTYS_ARE_PTMX)
74	pcg	1.4	int pfd;
75	pcg	1.1
76	root	1.45	# if defined(PTYS_ARE_GETPT)
77	ayin	1.44	pfd = getpt();
78	root	1.45	# elif defined(PTYS_ARE_POSIX)
79	ayin	1.44	pfd = posix_openpt (O_RDWR);
80			# else
81			pfd = open ("/dev/ptmx", O_RDWR \| O_NOCTTY, 0);
82			# endif
83			if (pfd >= 0)
84			{
85			if (grantpt (pfd) == 0 /* change slave permissions */
86			&& unlockpt (pfd) == 0)
87			{ /* slave now unlocked */
88			ttydev = strdup (ptsname (pfd)); / get slave's name */
89			return pfd;
90			}
91	root	1.45
92	ayin	1.44	close (pfd);
93			}
94	ayin	1.49	# endif
95	ayin	1.44	#endif
96	root	1.45
97	ayin	1.44	return -1;
98			}
99
100			static inline int
101			get_pty_openpty (int fd_tty, char *ttydev)
102			{
103	pcg	1.1	#ifdef PTYS_ARE_OPENPTY
104	ayin	1.44	int pfd;
105			int res;
106	root	1.26	char tty_name[sizeof "/dev/pts/????\0"];
107	ayin	1.44
108			res = openpty (&pfd, fd_tty, tty_name, NULL, NULL);
109	root	1.27	if (res != -1)
110	pcg	1.4	{
111	pcg	1.6	*ttydev = strdup (tty_name);
112	pcg	1.4	return pfd;
113	pcg	1.1	}
114			#endif
115	root	1.45
116	ayin	1.44	return -1;
117			}
118	pcg	1.1
119	ayin	1.44	static inline int
120			get_pty__getpty (int fd_tty, char *ttydev)
121			{
122	pcg	1.1	#ifdef PTYS_ARE__GETPTY
123	ayin	1.44	int pfd;
124
125	pcg	1.6	*ttydev = _getpty (&pfd, O_RDWR \| O_NONBLOCK \| O_NOCTTY, 0622, 0);
126	pcg	1.4	if (*ttydev != NULL)
127			return pfd;
128	pcg	1.1	#endif
129	root	1.45
130	ayin	1.44	return -1;
131			}
132	pcg	1.1
133	ayin	1.44	static inline int
134			get_pty_ptc (int fd_tty, char *ttydev)
135			{
136			#ifdef PTYS_ARE_PTC
137			int pfd;
138	pcg	1.4
139	pcg	1.6	if ((pfd = open ("/dev/ptc", O_RDWR \| O_NOCTTY, 0)) >= 0)
140	pcg	1.4	{
141	root	1.16	*ttydev = strdup (ttyname (pfd));
142	pcg	1.4	return pfd;
143	pcg	1.1	}
144			#endif
145	root	1.45
146	ayin	1.44	return -1;
147			}
148	pcg	1.1
149	ayin	1.44	static inline int
150			get_pty_clone (int fd_tty, char *ttydev)
151			{
152	pcg	1.1	#ifdef PTYS_ARE_CLONE
153	ayin	1.44	int pfd;
154
155	pcg	1.6	if ((pfd = open ("/dev/ptym/clone", O_RDWR \| O_NOCTTY, 0)) >= 0)
156	pcg	1.4	{
157	root	1.16	*ttydev = strdup (ptsname (pfd));
158	pcg	1.4	return pfd;
159	pcg	1.1	}
160			#endif
161	root	1.45
162	ayin	1.44	return -1;
163			}
164	pcg	1.1
165	ayin	1.44	static inline int
166			get_pty_numeric (int fd_tty, char *ttydev)
167			{
168	pcg	1.1	#ifdef PTYS_ARE_NUMERIC
169	root	1.45	int pfd;
170			int idx;
171			char c1, c2;
172			char pty_name[] = "/dev/ptyp???";
173			char tty_name[] = "/dev/ttyp???";
174
175			c1 = &(pty_name[sizeof (pty_name) - 4]);
176			c2 = &(tty_name[sizeof (tty_name) - 4]);
177
178			for (idx = 0; idx < 256; idx++)
179			{
180			sprintf (c1, "%d", idx);
181			sprintf (c2, "%d", idx);
182
183			if (access (tty_name, F_OK) < 0)
184			{
185			idx = 256;
186			break;
187			}
188
189			if ((pfd = open (pty_name, O_RDWR \| O_NOCTTY, 0)) >= 0)
190			{
191			if (access (tty_name, R_OK \| W_OK) == 0)
192			{
193			*ttydev = strdup (tty_name);
194			return pfd;
195			}
196
197			close (pfd);
198			}
199			}
200	pcg	1.1	#endif
201	root	1.45
202			return -1;
203	ayin	1.44	}
204	root	1.16
205	ayin	1.44	static inline int
206			get_pty_searched (int fd_tty, char *ttydev)
207			{
208	pcg	1.1	#ifdef PTYS_ARE_SEARCHED
209			# ifndef PTYCHAR1
210			# define PTYCHAR1 "pqrstuvwxyz"
211			# endif
212			# ifndef PTYCHAR2
213			# define PTYCHAR2 "0123456789abcdef"
214			# endif
215	root	1.45	int pfd;
216			const char c1, c2;
217			char pty_name[] = "/dev/pty??";
218			char tty_name[] = "/dev/tty??";
219
220			for (c1 = PTYCHAR1; *c1; c1++)
221			{
222			pty_name[ (sizeof (pty_name) - 3)] =
223			tty_name[ (sizeof (pty_name) - 3)] = *c1;
224
225			for (c2 = PTYCHAR2; *c2; c2++)
226			{
227			pty_name[ (sizeof (pty_name) - 2)] =
228			tty_name[ (sizeof (pty_name) - 2)] = *c2;
229
230			if ((pfd = open (pty_name, O_RDWR \| O_NOCTTY, 0)) >= 0)
231			{
232			if (access (tty_name, R_OK \| W_OK) == 0)
233			{
234			*ttydev = strdup (tty_name);
235			return pfd;
236			}
237
238			close (pfd);
239			}
240			}
241			}
242	pcg	1.1	#endif
243	root	1.45
244			return -1;
245	ayin	1.44	}
246	root	1.16
247	ayin	1.44	static int
248			get_pty (int fd_tty, char *ttydev)
249			{
250			int pfd;
251
252			if ((pfd = get_pty_streams (fd_tty, ttydev)) != -1
253			\|\| (pfd = get_pty_openpty (fd_tty, ttydev)) != -1
254			\|\| (pfd = get_pty__getpty (fd_tty, ttydev)) != -1
255			\|\| (pfd = get_pty_ptc (fd_tty, ttydev)) != -1
256			\|\| (pfd = get_pty_clone (fd_tty, ttydev)) != -1
257			\|\| (pfd = get_pty_numeric (fd_tty, ttydev)) != -1
258			\|\| (pfd = get_pty_searched (fd_tty, ttydev)) != -1)
259			return pfd;
260	root	1.45
261	pcg	1.4	return -1;
262	pcg	1.1	}
263
264			/----------------------------------------------------------------------/
265			/*
266			* Returns tty file descriptor, or -1 on failure
267			*/
268	root	1.16	static int
269			get_tty (char *ttydev)
270	pcg	1.1	{
271	pcg	1.4	return open (ttydev, O_RDWR \| O_NOCTTY, 0);
272	pcg	1.1	}
273
274			/----------------------------------------------------------------------/
275			/*
276			* Make our tty a controlling tty so that /dev/tty points to us
277			*/
278	root	1.16	static int
279	root	1.36	control_tty (int fd_tty)
280	pcg	1.1	{
281	pcg	1.4	setsid ();
282	root	1.16
283	root	1.47	#if defined(PTYS_ARE_PTMX) && defined(I_PUSH)
284	pcg	1.4	/*
285			* Push STREAMS modules:
286			* ptem: pseudo-terminal hardware emulation module.
287			* ldterm: standard terminal line discipline.
288			* ttcompat: V7, 4BSD and XENIX STREAMS compatibility module.
289			*
290	pcg	1.6	* After we push the STREAMS modules, the first open () on the slave side
291	pcg	1.4	* (i.e. the next section between the dashes giving us "tty opened OK")
292			* should make the "ptem" (or "ldterm" depending upon either which OS
293			* version or which set of manual pages you have) module give us a
294	pcg	1.6	* controlling terminal. We must already have close ()d the master side
295	pcg	1.4	* fd in this child process before we push STREAMS modules on because the
296	pcg	1.6	* documentation is really unclear about whether it is any close () on
297			* the master side or the last close () - i.e. a proper STREAMS dismantling
298			* close () - on the master side which causes a hang up to be sent
299	pcg	1.4	* through - Geoff Wing
300			*/
301	root	1.47	# ifdef HAVE_ISASTREAM
302	pcg	1.4	if (isastream (fd_tty) == 1)
303	root	1.47	# endif
304	pcg	1.1	{
305	pcg	1.4	ioctl (fd_tty, I_PUSH, "ptem");
306			ioctl (fd_tty, I_PUSH, "ldterm");
307			ioctl (fd_tty, I_PUSH, "ttcompat");
308	pcg	1.1	}
309	root	1.47	#endif
310	root	1.45
311			ioctl (fd_tty, TIOCSCTTY, NULL);
312
313			int fd = open ("/dev/tty", O_WRONLY);
314	pcg	1.4	if (fd < 0)
315			return -1; /* fatal */
316	root	1.45
317	pcg	1.4	close (fd);
318
319			return 0;
320	pcg	1.1	}
321	root	1.16
322	root	1.36	void
323			rxvt_ptytty::close_tty ()
324			{
325			if (tty < 0)
326			return;
327
328			close (tty);
329			tty = -1;
330			}
331
332			bool
333			rxvt_ptytty::make_controlling_tty ()
334			{
335			return control_tty (tty) >= 0;
336			}
337
338			void
339			rxvt_ptytty::set_utf8_mode (bool on)
340			{
341			#ifdef IUTF8
342			if (pty < 0)
343			return;
344
345			struct termios tio;
346
347			if (tcgetattr (pty, &tio) != -1)
348			{
349			tcflag_t new_cflag = tio.c_iflag;
350
351			if (on)
352			new_cflag \|= IUTF8;
353			else
354			new_cflag &= ~IUTF8;
355
356			if (new_cflag != tio.c_iflag)
357			{
358			tio.c_iflag = new_cflag;
359			tcsetattr (pty, TCSANOW, &tio);
360			}
361			}
362			#endif
363			}
364
365	root	1.16	static struct ttyconf {
366			gid_t gid;
367			mode_t mode;
368
369			ttyconf ()
370			{
371			#ifdef TTY_GID_SUPPORT
372			struct group *gr = getgrnam ("tty");
373
374			if (gr)
375			{ /* change group ownership of tty to "tty" */
376			mode = S_IRUSR \| S_IWUSR \| S_IWGRP;
377			gid = gr->gr_gid;
378			}
379			else
380			#endif /* TTY_GID_SUPPORT */
381			{
382			mode = S_IRUSR \| S_IWUSR \| S_IWGRP \| S_IWOTH;
383	ayin	1.48	gid = 0;
384	root	1.16	}
385			}
386			} ttyconf;
387
388	root	1.36	rxvt_ptytty_unix::rxvt_ptytty_unix ()
389	root	1.16	{
390			pty = tty = -1;
391			name = 0;
392	root	1.35	#if UTMP_SUPPORT
393			cmd_pid = 0;
394			#endif
395	root	1.16	}
396
397	root	1.36	rxvt_ptytty_unix::~rxvt_ptytty_unix ()
398	root	1.16	{
399	root	1.43	#if UTMP_SUPPORT
400	root	1.35	logout ();
401	root	1.43	#endif
402	root	1.16	put ();
403			}
404
405			void
406	root	1.36	rxvt_ptytty_unix::put ()
407	root	1.16	{
408	ayin	1.49	chmod (name, RESTORE_TTY_MODE);
409			chown (name, 0, ttyconf.gid);
410	root	1.16
411			if (pty >= 0) close (pty);
412			close_tty ();
413			free (name);
414
415			pty = tty = -1;
416			name = 0;
417			}
418
419			bool
420	root	1.36	rxvt_ptytty_unix::get ()
421	root	1.16	{
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	ayin	1.49	chown (name, getuid (), ttyconf.gid); /* fail silently */
433			chmod (name, ttyconf.mode);
434			# ifdef HAVE_REVOKE
435			revoke (name);
436			# endif
437	root	1.16	#endif
438
439			if ((tty = get_tty (name)) < 0)
440			{
441			put ();
442			return false;
443			}
444			}
445
446			return true;
447			}
448
449	root	1.40	#if PTYTTY_HELPER
450
451			static int sock_fd;
452			static int pid;
453
454			struct command
455			{
456			enum { get, login, destroy } type;
457
458			rxvt_ptytty *id;
459
460			bool login_shell;
461			int cmd_pid;
462			char hostname[512]; // arbitrary, but should be plenty
463			};
464
465			struct rxvt_ptytty_proxy : zero_initialized, rxvt_ptytty
466			{
467			rxvt_ptytty *id;
468
469			~rxvt_ptytty_proxy ();
470
471			bool get ();
472			void login (int cmd_pid, bool login_shell, const char *hostname);
473			};
474
475			bool
476			rxvt_ptytty_proxy::get ()
477			{
478			command cmd;
479
480			cmd.type = command::get;
481
482			write (sock_fd, &cmd, sizeof (cmd));
483
484			if (read (sock_fd, &id, sizeof (id)) != sizeof (id))
485			rxvt_fatal ("protocol error while creating pty using helper process, aborting.\n");
486
487			if (!id)
488			return false;
489
490			if ((pty = rxvt_recv_fd (sock_fd)) < 0
491			\|\| (tty = rxvt_recv_fd (sock_fd)) < 0)
492			rxvt_fatal ("protocol error while reading pty/tty fds from helper process, aborting.\n");
493
494			return true;
495			}
496
497			void
498			rxvt_ptytty_proxy::login (int cmd_pid, bool login_shell, const char *hostname)
499			{
500			command cmd;
501
502			cmd.type = command::login;
503			cmd.id = id;
504			cmd.cmd_pid = cmd_pid;
505			cmd.login_shell = login_shell;
506			strncpy (cmd.hostname, hostname, sizeof (cmd.hostname));
507
508			write (sock_fd, &cmd, sizeof (cmd));
509			}
510
511			rxvt_ptytty_proxy::~rxvt_ptytty_proxy ()
512			{
513			command cmd;
514
515			cmd.type = command::destroy;
516			cmd.id = id;
517
518			write (sock_fd, &cmd, sizeof (cmd));
519			}
520
521			static
522			void serve ()
523			{
524			command cmd;
525			vector<rxvt_ptytty *> ptys;
526
527			while (read (sock_fd, &cmd, sizeof (command)) == sizeof (command))
528			{
529			if (cmd.type == command::get)
530			{
531			// -> id ptyfd ttyfd
532			cmd.id = new rxvt_ptytty_unix;
533
534			if (cmd.id->get ())
535			{
536			write (sock_fd, &cmd.id, sizeof (cmd.id));
537			ptys.push_back (cmd.id);
538
539			rxvt_send_fd (sock_fd, cmd.id->pty);
540			rxvt_send_fd (sock_fd, cmd.id->tty);
541			}
542			else
543			{
544			delete cmd.id;
545			cmd.id = 0;
546			write (sock_fd, &cmd.id, sizeof (cmd.id));
547			}
548			}
549			else if (cmd.type == command::login)
550			{
551	root	1.43	#if UTMP_SUPPORT
552	root	1.40	if (find (ptys.begin (), ptys.end (), cmd.id))
553			{
554			cmd.hostname[sizeof (cmd.hostname) - 1] = 0;
555			cmd.id->login (cmd.cmd_pid, cmd.login_shell, cmd.hostname);
556			}
557	root	1.43	#endif
558	root	1.40	}
559			else if (cmd.type == command::destroy)
560			{
561			rxvt_ptytty **pty = find (ptys.begin (), ptys.end (), cmd.id);
562
563	root	1.42	if (pty)
564	root	1.40	{
565	root	1.42	delete *pty;
566	root	1.40	ptys.erase (pty);
567			}
568			}
569			else
570			break;
571			}
572
573			// destroy all ptys
574			for (rxvt_ptytty **i = ptys.end (); i-- > ptys.begin (); )
575			delete *i;
576			}
577
578			void rxvt_ptytty_server ()
579			{
580			int sv[2];
581
582			if (socketpair (AF_UNIX, SOCK_STREAM, 0, sv))
583			rxvt_fatal ("could not create socket to communicate with pty/sessiondb helper, aborting.\n");
584
585			pid = fork ();
586
587			if (pid < 0)
588			rxvt_fatal ("could not create pty/sessiondb helper process, aborting.\n");
589
590			if (pid)
591			{
592			// client, urxvt
593			sock_fd = sv[0];
594			close (sv[1]);
595			fcntl (sock_fd, F_SETFD, FD_CLOEXEC);
596			}
597			else
598			{
599			// server, pty-helper
600			sock_fd = sv[1];
601
602	root	1.41	for (int fd = 0; fd < 1023; fd++)
603	root	1.46	if (fd != sock_fd)
604	root	1.41	close (fd);
605	root	1.40
606			serve ();
607			_exit (EXIT_SUCCESS);
608			}
609			}
610			#endif
611
612	root	1.39	// a "factory" g
613	root	1.40	rxvt_ptytty *
614			rxvt_new_ptytty ()
615	root	1.39	{
616	root	1.40	#if PTYTTY_HELPER
617			if (pid > 0)
618	root	1.41	// use helper process
619			return new rxvt_ptytty_proxy;
620	root	1.40	else
621			#endif
622			return new rxvt_ptytty_unix;
623	root	1.39	}
624
625	pcg	1.1	/----------------------- end-of-file (C source) -----------------------/
626	root	1.16