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 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

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

  {
#  ifdef PTYS_ARE_GETPT
    pfd = getpt();
#  else
#  ifdef PTYS_ARE_POSIX
    pfd = posix_openpt (O_RDWR);
#  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);
      }
  }
# 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)
{
  int fd;

  /* ---------------------------------------- */
  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
  /* ---------------------------------------- */
  fd = ioctl (fd_tty, TIOCSCTTY, NULL);
  /* ---------------------------------------- */
  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
}

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

#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_unix::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_unix::rxvt_ptytty_unix ()
{
  pty = tty = -1;
  name = 0;
#ifndef NO_SETOWNER_TTYDEV
  saved = false;
#endif
#if UTMP_SUPPORT
  cmd_pid = 0;
#endif
}

rxvt_ptytty_unix::~rxvt_ptytty_unix ()
{
  logout ();
  put ();
}

void
rxvt_ptytty_unix::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_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
      privileges (SAVE);
#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 ();
  ~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 (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);
            }
          else printf ("xxx hiya login no match %p\n", cmd.id);
        }
      else if (cmd.type == command::destroy)
        {
          rxvt_ptytty **pty = find (ptys.begin (), ptys.end (), cmd.id);

          if (*pty)
            {
              ptys.erase (pty);
              delete *pty;
            }
          else printf ("xxx hiya destroy no match %p\n", cmd.id);
        }
      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];

      close (sv[0]);//D
//      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:	1.40
Committed:	Tue Jan 17 15:17:39 2006 UTC (18 years, 4 months ago) by root
Content type:	text/plain
Branch:	MAIN
Changes since 1.39:	+185 -13 lines
Log Message:	logging.C
#	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	root	1.16	static int
70			get_pty (int fd_tty, char *ttydev)
71	pcg	1.1	{
72	pcg	1.4	int pfd;
73	pcg	1.1
74			#ifdef PTYS_ARE_OPENPTY
75	root	1.26	char tty_name[sizeof "/dev/pts/????\0"];
76	pcg	1.4
77	root	1.27	rxvt_privileges(RESTORE);
78			int res = openpty (&pfd, fd_tty, tty_name, NULL, NULL);
79			rxvt_privileges(IGNORE);
80
81			if (res != -1)
82	pcg	1.4	{
83	pcg	1.6	*ttydev = strdup (tty_name);
84	pcg	1.4	return pfd;
85	pcg	1.1	}
86			#endif
87
88			#ifdef PTYS_ARE__GETPTY
89	pcg	1.6	*ttydev = _getpty (&pfd, O_RDWR \| O_NONBLOCK \| O_NOCTTY, 0622, 0);
90	pcg	1.4	if (*ttydev != NULL)
91			return pfd;
92	pcg	1.1	#endif
93
94			#if defined(HAVE_GRANTPT) && defined(HAVE_UNLOCKPT)
95	ayin	1.34	# if defined(PTYS_ARE_GETPT) \|\| defined(PTYS_ARE_POSIX) \|\| defined(PTYS_ARE_PTMX)
96	pcg	1.4
97			{
98	ayin	1.34	# ifdef PTYS_ARE_GETPT
99			pfd = getpt();
100			# else
101	root	1.33	# ifdef PTYS_ARE_POSIX
102			pfd = posix_openpt (O_RDWR);
103	pcg	1.1	# else
104	pcg	1.6	pfd = open ("/dev/ptmx", O_RDWR \| O_NOCTTY, 0);
105	pcg	1.1	# endif
106	ayin	1.34	# endif
107	pcg	1.4
108			if (pfd >= 0)
109			{
110	pcg	1.6	if (grantpt (pfd) == 0 /* change slave permissions */
111			&& unlockpt (pfd) == 0)
112	pcg	1.4	{ /* slave now unlocked */
113	root	1.16	ttydev = strdup (ptsname (pfd)); / get slave's name */
114	pcg	1.4	return pfd;
115			}
116	pcg	1.6	close (pfd);
117	pcg	1.4	}
118			}
119	pcg	1.1	# endif
120			#endif
121
122			#ifdef PTYS_ARE_PTC
123	pcg	1.6	if ((pfd = open ("/dev/ptc", O_RDWR \| O_NOCTTY, 0)) >= 0)
124	pcg	1.4	{
125	root	1.16	*ttydev = strdup (ttyname (pfd));
126	pcg	1.4	return pfd;
127	pcg	1.1	}
128			#endif
129
130			#ifdef PTYS_ARE_CLONE
131	pcg	1.6	if ((pfd = open ("/dev/ptym/clone", O_RDWR \| O_NOCTTY, 0)) >= 0)
132	pcg	1.4	{
133	root	1.16	*ttydev = strdup (ptsname (pfd));
134	pcg	1.4	return pfd;
135	pcg	1.1	}
136			#endif
137
138			#ifdef PTYS_ARE_NUMERIC
139	pcg	1.4	{
140	root	1.16	int idx;
141			char c1, c2;
142			char pty_name[] = "/dev/ptyp???";
143			char tty_name[] = "/dev/ttyp???";
144	pcg	1.4
145	root	1.16	c1 = &(pty_name[sizeof (pty_name) - 4]);
146			c2 = &(tty_name[sizeof (tty_name) - 4]);
147	pcg	1.4	for (idx = 0; idx < 256; idx++)
148			{
149	pcg	1.6	sprintf (c1, "%d", idx);
150			sprintf (c2, "%d", idx);
151			if (access (tty_name, F_OK) < 0)
152	pcg	1.4	{
153			idx = 256;
154			break;
155			}
156	root	1.16
157	pcg	1.6	if ((pfd = open (pty_name, O_RDWR \| O_NOCTTY, 0)) >= 0)
158	pcg	1.4	{
159	pcg	1.6	if (access (tty_name, R_OK \| W_OK) == 0)
160	pcg	1.4	{
161	pcg	1.6	*ttydev = strdup (tty_name);
162	pcg	1.4	return pfd;
163			}
164	root	1.16
165	pcg	1.6	close (pfd);
166	pcg	1.4	}
167			}
168			}
169	pcg	1.1	#endif
170	root	1.16
171	pcg	1.1	#ifdef PTYS_ARE_SEARCHED
172	pcg	1.4	{
173	root	1.16	const char c1, c2;
174			char pty_name[] = "/dev/pty??";
175			char tty_name[] = "/dev/tty??";
176	pcg	1.1
177			# ifndef PTYCHAR1
178			# define PTYCHAR1 "pqrstuvwxyz"
179			# endif
180			# ifndef PTYCHAR2
181			# define PTYCHAR2 "0123456789abcdef"
182			# endif
183	pcg	1.4
184			for (c1 = PTYCHAR1; *c1; c1++)
185			{
186	pcg	1.6	pty_name[ (sizeof (pty_name) - 3)] =
187			tty_name[ (sizeof (pty_name) - 3)] = *c1;
188	pcg	1.4	for (c2 = PTYCHAR2; *c2; c2++)
189			{
190	pcg	1.6	pty_name[ (sizeof (pty_name) - 2)] =
191			tty_name[ (sizeof (pty_name) - 2)] = *c2;
192			if ((pfd = open (pty_name, O_RDWR \| O_NOCTTY, 0)) >= 0)
193	pcg	1.4	{
194	pcg	1.6	if (access (tty_name, R_OK \| W_OK) == 0)
195	pcg	1.4	{
196	pcg	1.6	*ttydev = strdup (tty_name);
197	pcg	1.4	return pfd;
198			}
199	root	1.16
200	pcg	1.6	close (pfd);
201	pcg	1.4	}
202			}
203			}
204			}
205	pcg	1.1	#endif
206	root	1.16
207	pcg	1.4	return -1;
208	pcg	1.1	}
209
210			/----------------------------------------------------------------------/
211			/*
212			* Returns tty file descriptor, or -1 on failure
213			*/
214	root	1.16	static int
215			get_tty (char *ttydev)
216	pcg	1.1	{
217	pcg	1.4	return open (ttydev, O_RDWR \| O_NOCTTY, 0);
218	pcg	1.1	}
219
220			/----------------------------------------------------------------------/
221			/*
222			* Make our tty a controlling tty so that /dev/tty points to us
223			*/
224	root	1.16	static int
225	root	1.36	control_tty (int fd_tty)
226	pcg	1.1	{
227	pcg	1.4	int fd;
228	pcg	1.1
229	pcg	1.4	/* ---------------------------------------- */
230			setsid ();
231	root	1.16
232	pcg	1.4	/* ---------------------------------------- */
233	root	1.36	# if defined(PTYS_ARE_PTMX) && defined(I_PUSH)
234	pcg	1.4	/*
235			* Push STREAMS modules:
236			* ptem: pseudo-terminal hardware emulation module.
237			* ldterm: standard terminal line discipline.
238			* ttcompat: V7, 4BSD and XENIX STREAMS compatibility module.
239			*
240	pcg	1.6	* After we push the STREAMS modules, the first open () on the slave side
241	pcg	1.4	* (i.e. the next section between the dashes giving us "tty opened OK")
242			* should make the "ptem" (or "ldterm" depending upon either which OS
243			* version or which set of manual pages you have) module give us a
244	pcg	1.6	* controlling terminal. We must already have close ()d the master side
245	pcg	1.4	* fd in this child process before we push STREAMS modules on because the
246	pcg	1.6	* documentation is really unclear about whether it is any close () on
247			* the master side or the last close () - i.e. a proper STREAMS dismantling
248			* close () - on the master side which causes a hang up to be sent
249	pcg	1.4	* through - Geoff Wing
250			*/
251	root	1.36	# ifdef HAVE_ISASTREAM
252	pcg	1.4	if (isastream (fd_tty) == 1)
253	root	1.36	# endif
254	pcg	1.1	{
255	pcg	1.4	ioctl (fd_tty, I_PUSH, "ptem");
256			ioctl (fd_tty, I_PUSH, "ldterm");
257			ioctl (fd_tty, I_PUSH, "ttcompat");
258	pcg	1.1	}
259	root	1.36	# endif
260	pcg	1.4	/* ---------------------------------------- */
261			fd = ioctl (fd_tty, TIOCSCTTY, NULL);
262			/* ---------------------------------------- */
263			fd = open ("/dev/tty", O_WRONLY);
264			if (fd < 0)
265			return -1; /* fatal */
266			close (fd);
267			/* ---------------------------------------- */
268
269			return 0;
270	pcg	1.1	}
271	root	1.16
272	root	1.36	void
273			rxvt_ptytty::close_tty ()
274			{
275			if (tty < 0)
276			return;
277
278			close (tty);
279			tty = -1;
280			}
281
282			bool
283			rxvt_ptytty::make_controlling_tty ()
284			{
285			return control_tty (tty) >= 0;
286			}
287
288			void
289			rxvt_ptytty::set_utf8_mode (bool on)
290			{
291			#ifdef IUTF8
292			if (pty < 0)
293			return;
294
295			struct termios tio;
296
297			if (tcgetattr (pty, &tio) != -1)
298			{
299			tcflag_t new_cflag = tio.c_iflag;
300
301			if (on)
302			new_cflag \|= IUTF8;
303			else
304			new_cflag &= ~IUTF8;
305
306			if (new_cflag != tio.c_iflag)
307			{
308			tio.c_iflag = new_cflag;
309			tcsetattr (pty, TCSANOW, &tio);
310			}
311			}
312			#endif
313			}
314
315			/////////////////////////////////////////////////////////////////////////////
316
317	root	1.16	#ifndef NO_SETOWNER_TTYDEV
318			static struct ttyconf {
319			gid_t gid;
320			mode_t mode;
321
322			ttyconf ()
323			{
324			#ifdef TTY_GID_SUPPORT
325			struct group *gr = getgrnam ("tty");
326
327			if (gr)
328			{ /* change group ownership of tty to "tty" */
329			mode = S_IRUSR \| S_IWUSR \| S_IWGRP;
330			gid = gr->gr_gid;
331			}
332			else
333			#endif /* TTY_GID_SUPPORT */
334			{
335			mode = S_IRUSR \| S_IWUSR \| S_IWGRP \| S_IWOTH;
336			gid = getgid ();
337			}
338			}
339			} ttyconf;
340
341	root	1.36	/////////////////////////////////////////////////////////////////////////////
342
343	root	1.16	void
344	root	1.36	rxvt_ptytty_unix::privileges (rxvt_privaction action)
345	root	1.16	{
346	root	1.26	if (!name \|\| !*name)
347	root	1.23	return;
348
349	root	1.16	rxvt_privileges (RESTORE);
350
351			if (action == SAVE)
352			{
353			# ifndef RESET_TTY_TO_COMMON_DEFAULTS
354			/* store original tty status for restoration rxvt_clean_exit () -- rgg 04/12/95 */
355			if (lstat (name, &savestat) < 0) /* you lose out */
356	root	1.26	;
357	root	1.16	else
358			# endif
359			{
360	root	1.26	saved = true;
361	root	1.16	chown (name, getuid (), ttyconf.gid); /* fail silently */
362			chmod (name, ttyconf.mode);
363			# ifdef HAVE_REVOKE
364			revoke (name);
365			# endif
366			}
367			}
368			else
369			{ /* action == RESTORE */
370			# ifndef RESET_TTY_TO_COMMON_DEFAULTS
371	root	1.26	if (saved)
372			{
373			chmod (name, savestat.st_mode);
374			chown (name, savestat.st_uid, savestat.st_gid);
375			}
376	root	1.16	# else
377			chmod (name, (S_IRUSR \| S_IWUSR \| S_IRGRP \| S_IWGRP \| S_IROTH \| S_IWOTH));
378			chown (name, 0, 0);
379			# endif
380
381			}
382
383			rxvt_privileges (IGNORE);
384			}
385			#endif
386
387	root	1.36	rxvt_ptytty_unix::rxvt_ptytty_unix ()
388	root	1.16	{
389			pty = tty = -1;
390			name = 0;
391	root	1.26	#ifndef NO_SETOWNER_TTYDEV
392			saved = false;
393			#endif
394	root	1.35	#if UTMP_SUPPORT
395			cmd_pid = 0;
396			#endif
397	root	1.16	}
398
399	root	1.36	rxvt_ptytty_unix::~rxvt_ptytty_unix ()
400	root	1.16	{
401	root	1.35	logout ();
402	root	1.16	put ();
403			}
404
405			void
406	root	1.36	rxvt_ptytty_unix::put ()
407	root	1.16	{
408			#ifndef NO_SETOWNER_TTYDEV
409	root	1.28	privileges (RESTORE);
410	root	1.16	#endif
411
412			if (pty >= 0) close (pty);
413			close_tty ();
414			free (name);
415
416			pty = tty = -1;
417			name = 0;
418			}
419
420			bool
421	root	1.36	rxvt_ptytty_unix::get ()
422	root	1.16	{
423			/* get master (pty) */
424			if ((pty = get_pty (&tty, &name)) < 0)
425			return false;
426
427			fcntl (pty, F_SETFL, O_NONBLOCK);
428
429			/* get slave (tty) */
430			if (tty < 0)
431			{
432			#ifndef NO_SETOWNER_TTYDEV
433			privileges (SAVE);
434			#endif
435
436			if ((tty = get_tty (name)) < 0)
437			{
438			put ();
439			return false;
440			}
441			}
442
443			return true;
444			}
445
446	root	1.40	#if PTYTTY_HELPER
447
448			static int sock_fd;
449			static int pid;
450
451			struct command
452			{
453			enum { get, login, destroy } type;
454
455			rxvt_ptytty *id;
456
457			bool login_shell;
458			int cmd_pid;
459			char hostname[512]; // arbitrary, but should be plenty
460			};
461
462			struct rxvt_ptytty_proxy : zero_initialized, rxvt_ptytty
463			{
464			rxvt_ptytty *id;
465
466			rxvt_ptytty_proxy ();
467			~rxvt_ptytty_proxy ();
468
469			bool get ();
470			void login (int cmd_pid, bool login_shell, const char *hostname);
471			};
472
473			bool
474			rxvt_ptytty_proxy::get ()
475			{
476			command cmd;
477
478			cmd.type = command::get;
479
480			write (sock_fd, &cmd, sizeof (cmd));
481
482			if (read (sock_fd, &id, sizeof (id)) != sizeof (id))
483			rxvt_fatal ("protocol error while creating pty using helper process, aborting.\n");
484
485			if (!id)
486			return false;
487
488			if ((pty = rxvt_recv_fd (sock_fd)) < 0
489			\|\| (tty = rxvt_recv_fd (sock_fd)) < 0)
490			rxvt_fatal ("protocol error while reading pty/tty fds from helper process, aborting.\n");
491
492			return true;
493			}
494
495			void
496			rxvt_ptytty_proxy::login (int cmd_pid, bool login_shell, const char *hostname)
497			{
498			command cmd;
499
500			cmd.type = command::login;
501			cmd.id = id;
502			cmd.cmd_pid = cmd_pid;
503			cmd.login_shell = login_shell;
504			strncpy (cmd.hostname, hostname, sizeof (cmd.hostname));
505
506			write (sock_fd, &cmd, sizeof (cmd));
507			}
508
509			rxvt_ptytty_proxy::~rxvt_ptytty_proxy ()
510			{
511			command cmd;
512
513			cmd.type = command::destroy;
514			cmd.id = id;
515
516			write (sock_fd, &cmd, sizeof (cmd));
517			}
518
519			static
520			void serve ()
521			{
522			command cmd;
523			vector<rxvt_ptytty *> ptys;
524
525			while (read (sock_fd, &cmd, sizeof (command)) == sizeof (command))
526			{
527			if (cmd.type == command::get)
528			{
529			// -> id ptyfd ttyfd
530			cmd.id = new rxvt_ptytty_unix;
531
532			if (cmd.id->get ())
533			{
534			write (sock_fd, &cmd.id, sizeof (cmd.id));
535			ptys.push_back (cmd.id);
536
537			rxvt_send_fd (sock_fd, cmd.id->pty);
538			rxvt_send_fd (sock_fd, cmd.id->tty);
539			}
540			else
541			{
542			delete cmd.id;
543			cmd.id = 0;
544			write (sock_fd, &cmd.id, sizeof (cmd.id));
545			}
546			}
547			else if (cmd.type == command::login)
548			{
549			if (find (ptys.begin (), ptys.end (), cmd.id))
550			{
551			cmd.hostname[sizeof (cmd.hostname) - 1] = 0;
552			cmd.id->login (cmd.cmd_pid, cmd.login_shell, cmd.hostname);
553			}
554			else printf ("xxx hiya login no match %p\n", cmd.id);
555			}
556			else if (cmd.type == command::destroy)
557			{
558			rxvt_ptytty **pty = find (ptys.begin (), ptys.end (), cmd.id);
559
560			if (*pty)
561			{
562			ptys.erase (pty);
563			delete *pty;
564			}
565			else printf ("xxx hiya destroy no match %p\n", cmd.id);
566			}
567			else
568			break;
569			}
570
571			// destroy all ptys
572			for (rxvt_ptytty **i = ptys.end (); i-- > ptys.begin (); )
573			delete *i;
574			}
575
576			void rxvt_ptytty_server ()
577			{
578			int sv[2];
579
580			if (socketpair (AF_UNIX, SOCK_STREAM, 0, sv))
581			rxvt_fatal ("could not create socket to communicate with pty/sessiondb helper, aborting.\n");
582
583			pid = fork ();
584
585			if (pid < 0)
586			rxvt_fatal ("could not create pty/sessiondb helper process, aborting.\n");
587
588			if (pid)
589			{
590			// client, urxvt
591			sock_fd = sv[0];
592			close (sv[1]);
593			fcntl (sock_fd, F_SETFD, FD_CLOEXEC);
594			}
595			else
596			{
597			// server, pty-helper
598			sock_fd = sv[1];
599
600			close (sv[0]);//D
601			// for (int fd = 0; fd < 1023; fd++)
602			// if (fd != sock_fd)
603			// close (fd);
604
605			serve ();
606			_exit (EXIT_SUCCESS);
607			}
608			}
609			#endif
610
611	root	1.39	// a "factory" g
612	root	1.40	rxvt_ptytty *
613			rxvt_new_ptytty ()
614	root	1.39	{
615	root	1.40	#if PTYTTY_HELPER
616			if (pid > 0)
617			{
618			// use helper process
619			return new rxvt_ptytty_proxy;
620			}
621			else
622			#endif
623			return new rxvt_ptytty_unix;
624	root	1.39	}
625
626	pcg	1.1	/----------------------- end-of-file (C source) -----------------------/
627	root	1.16