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)
{
#ifdef NO_SETOWNER_TTYDEV
  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

  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
}

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

#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;

  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
    }
}
#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 ()
{
#if UTMP_SUPPORT
  logout ();
#endif
  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 ();

  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
    {
      setgid (getegid ());
      setuid (geteuid ());

      // server, pty-helper
      sock_fd = sv[1];

      for (int fd = 0; fd < 1023; fd++)
        if (fd != sock_fd && fd != 1)
          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:	1.45
Committed:	Tue Jan 17 18:06:14 2006 UTC (18 years, 4 months ago) by root
Content type:	text/plain
Branch:	MAIN
Changes since 1.44:	+76 -70 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	1.44	#ifdef NO_SETOWNER_TTYDEV
73	pcg	1.4	int pfd;
74	pcg	1.1
75	root	1.45	# if defined(PTYS_ARE_GETPT)
76	ayin	1.44	pfd = getpt();
77	root	1.45	# elif defined(PTYS_ARE_POSIX)
78	ayin	1.44	pfd = posix_openpt (O_RDWR);
79			# else
80			pfd = open ("/dev/ptmx", O_RDWR \| O_NOCTTY, 0);
81			# endif
82			if (pfd >= 0)
83			{
84			if (grantpt (pfd) == 0 /* change slave permissions */
85			&& unlockpt (pfd) == 0)
86			{ /* slave now unlocked */
87			ttydev = strdup (ptsname (pfd)); / get slave's name */
88			return pfd;
89			}
90	root	1.45
91	ayin	1.44	close (pfd);
92			}
93			#endif
94	root	1.45
95	ayin	1.44	return -1;
96			}
97
98			static inline int
99			get_pty_openpty (int fd_tty, char *ttydev)
100			{
101	pcg	1.1	#ifdef PTYS_ARE_OPENPTY
102	ayin	1.44	int pfd;
103			int res;
104	root	1.26	char tty_name[sizeof "/dev/pts/????\0"];
105	ayin	1.44
106			res = openpty (&pfd, fd_tty, tty_name, NULL, NULL);
107	root	1.27	if (res != -1)
108	pcg	1.4	{
109	pcg	1.6	*ttydev = strdup (tty_name);
110	pcg	1.4	return pfd;
111	pcg	1.1	}
112			#endif
113	root	1.45
114	ayin	1.44	return -1;
115			}
116	pcg	1.1
117	ayin	1.44	static inline int
118			get_pty__getpty (int fd_tty, char *ttydev)
119			{
120	pcg	1.1	#ifdef PTYS_ARE__GETPTY
121	ayin	1.44	int pfd;
122
123	pcg	1.6	*ttydev = _getpty (&pfd, O_RDWR \| O_NONBLOCK \| O_NOCTTY, 0622, 0);
124	pcg	1.4	if (*ttydev != NULL)
125			return pfd;
126	pcg	1.1	#endif
127	root	1.45
128	ayin	1.44	return -1;
129			}
130	pcg	1.1
131	ayin	1.44	static inline int
132			get_pty_ptc (int fd_tty, char *ttydev)
133			{
134			#ifdef PTYS_ARE_PTC
135			int pfd;
136	pcg	1.4
137	pcg	1.6	if ((pfd = open ("/dev/ptc", O_RDWR \| O_NOCTTY, 0)) >= 0)
138	pcg	1.4	{
139	root	1.16	*ttydev = strdup (ttyname (pfd));
140	pcg	1.4	return pfd;
141	pcg	1.1	}
142			#endif
143	root	1.45
144	ayin	1.44	return -1;
145			}
146	pcg	1.1
147	ayin	1.44	static inline int
148			get_pty_clone (int fd_tty, char *ttydev)
149			{
150	pcg	1.1	#ifdef PTYS_ARE_CLONE
151	ayin	1.44	int pfd;
152
153	pcg	1.6	if ((pfd = open ("/dev/ptym/clone", O_RDWR \| O_NOCTTY, 0)) >= 0)
154	pcg	1.4	{
155	root	1.16	*ttydev = strdup (ptsname (pfd));
156	pcg	1.4	return pfd;
157	pcg	1.1	}
158			#endif
159	root	1.45
160	ayin	1.44	return -1;
161			}
162	pcg	1.1
163	ayin	1.44	static inline int
164			get_pty_numeric (int fd_tty, char *ttydev)
165			{
166	pcg	1.1	#ifdef PTYS_ARE_NUMERIC
167	root	1.45	int pfd;
168			int idx;
169			char c1, c2;
170			char pty_name[] = "/dev/ptyp???";
171			char tty_name[] = "/dev/ttyp???";
172
173			c1 = &(pty_name[sizeof (pty_name) - 4]);
174			c2 = &(tty_name[sizeof (tty_name) - 4]);
175
176			for (idx = 0; idx < 256; idx++)
177			{
178			sprintf (c1, "%d", idx);
179			sprintf (c2, "%d", idx);
180
181			if (access (tty_name, F_OK) < 0)
182			{
183			idx = 256;
184			break;
185			}
186
187			if ((pfd = open (pty_name, O_RDWR \| O_NOCTTY, 0)) >= 0)
188			{
189			if (access (tty_name, R_OK \| W_OK) == 0)
190			{
191			*ttydev = strdup (tty_name);
192			return pfd;
193			}
194
195			close (pfd);
196			}
197			}
198	pcg	1.1	#endif
199	root	1.45
200			return -1;
201	ayin	1.44	}
202	root	1.16
203	ayin	1.44	static inline int
204			get_pty_searched (int fd_tty, char *ttydev)
205			{
206	pcg	1.1	#ifdef PTYS_ARE_SEARCHED
207			# ifndef PTYCHAR1
208			# define PTYCHAR1 "pqrstuvwxyz"
209			# endif
210			# ifndef PTYCHAR2
211			# define PTYCHAR2 "0123456789abcdef"
212			# endif
213	root	1.45	int pfd;
214			const char c1, c2;
215			char pty_name[] = "/dev/pty??";
216			char tty_name[] = "/dev/tty??";
217
218			for (c1 = PTYCHAR1; *c1; c1++)
219			{
220			pty_name[ (sizeof (pty_name) - 3)] =
221			tty_name[ (sizeof (pty_name) - 3)] = *c1;
222
223			for (c2 = PTYCHAR2; *c2; c2++)
224			{
225			pty_name[ (sizeof (pty_name) - 2)] =
226			tty_name[ (sizeof (pty_name) - 2)] = *c2;
227
228			if ((pfd = open (pty_name, O_RDWR \| O_NOCTTY, 0)) >= 0)
229			{
230			if (access (tty_name, R_OK \| W_OK) == 0)
231			{
232			*ttydev = strdup (tty_name);
233			return pfd;
234			}
235
236			close (pfd);
237			}
238			}
239			}
240	pcg	1.1	#endif
241	root	1.45
242			return -1;
243	ayin	1.44	}
244	root	1.16
245	ayin	1.44	static int
246			get_pty (int fd_tty, char *ttydev)
247			{
248			int pfd;
249
250			if ((pfd = get_pty_streams (fd_tty, ttydev)) != -1
251			\|\| (pfd = get_pty_openpty (fd_tty, ttydev)) != -1
252			\|\| (pfd = get_pty__getpty (fd_tty, ttydev)) != -1
253			\|\| (pfd = get_pty_ptc (fd_tty, ttydev)) != -1
254			\|\| (pfd = get_pty_clone (fd_tty, ttydev)) != -1
255			\|\| (pfd = get_pty_numeric (fd_tty, ttydev)) != -1
256			\|\| (pfd = get_pty_searched (fd_tty, ttydev)) != -1)
257			return pfd;
258	root	1.45
259	pcg	1.4	return -1;
260	pcg	1.1	}
261
262			/----------------------------------------------------------------------/
263			/*
264			* Returns tty file descriptor, or -1 on failure
265			*/
266	root	1.16	static int
267			get_tty (char *ttydev)
268	pcg	1.1	{
269	pcg	1.4	return open (ttydev, O_RDWR \| O_NOCTTY, 0);
270	pcg	1.1	}
271
272			/----------------------------------------------------------------------/
273			/*
274			* Make our tty a controlling tty so that /dev/tty points to us
275			*/
276	root	1.16	static int
277	root	1.36	control_tty (int fd_tty)
278	pcg	1.1	{
279	pcg	1.4	setsid ();
280	root	1.16
281	root	1.36	# if defined(PTYS_ARE_PTMX) && defined(I_PUSH)
282	pcg	1.4	/*
283			* Push STREAMS modules:
284			* ptem: pseudo-terminal hardware emulation module.
285			* ldterm: standard terminal line discipline.
286			* ttcompat: V7, 4BSD and XENIX STREAMS compatibility module.
287			*
288	pcg	1.6	* After we push the STREAMS modules, the first open () on the slave side
289	pcg	1.4	* (i.e. the next section between the dashes giving us "tty opened OK")
290			* should make the "ptem" (or "ldterm" depending upon either which OS
291			* version or which set of manual pages you have) module give us a
292	pcg	1.6	* controlling terminal. We must already have close ()d the master side
293	pcg	1.4	* fd in this child process before we push STREAMS modules on because the
294	pcg	1.6	* documentation is really unclear about whether it is any close () on
295			* the master side or the last close () - i.e. a proper STREAMS dismantling
296			* close () - on the master side which causes a hang up to be sent
297	pcg	1.4	* through - Geoff Wing
298			*/
299	root	1.36	# ifdef HAVE_ISASTREAM
300	pcg	1.4	if (isastream (fd_tty) == 1)
301	root	1.36	# endif
302	pcg	1.1	{
303	pcg	1.4	ioctl (fd_tty, I_PUSH, "ptem");
304			ioctl (fd_tty, I_PUSH, "ldterm");
305			ioctl (fd_tty, I_PUSH, "ttcompat");
306	pcg	1.1	}
307	root	1.36	# endif
308	root	1.45
309			ioctl (fd_tty, TIOCSCTTY, NULL);
310
311			int fd = open ("/dev/tty", O_WRONLY);
312	pcg	1.4	if (fd < 0)
313			return -1; /* fatal */
314	root	1.45
315	pcg	1.4	close (fd);
316
317			return 0;
318	pcg	1.1	}
319	root	1.16
320	root	1.36	void
321			rxvt_ptytty::close_tty ()
322			{
323			if (tty < 0)
324			return;
325
326			close (tty);
327			tty = -1;
328			}
329
330			bool
331			rxvt_ptytty::make_controlling_tty ()
332			{
333			return control_tty (tty) >= 0;
334			}
335
336			void
337			rxvt_ptytty::set_utf8_mode (bool on)
338			{
339			#ifdef IUTF8
340			if (pty < 0)
341			return;
342
343			struct termios tio;
344
345			if (tcgetattr (pty, &tio) != -1)
346			{
347			tcflag_t new_cflag = tio.c_iflag;
348
349			if (on)
350			new_cflag \|= IUTF8;
351			else
352			new_cflag &= ~IUTF8;
353
354			if (new_cflag != tio.c_iflag)
355			{
356			tio.c_iflag = new_cflag;
357			tcsetattr (pty, TCSANOW, &tio);
358			}
359			}
360			#endif
361			}
362
363			/////////////////////////////////////////////////////////////////////////////
364
365	root	1.16	#ifndef NO_SETOWNER_TTYDEV
366			static struct ttyconf {
367			gid_t gid;
368			mode_t mode;
369
370			ttyconf ()
371			{
372			#ifdef TTY_GID_SUPPORT
373			struct group *gr = getgrnam ("tty");
374
375			if (gr)
376			{ /* change group ownership of tty to "tty" */
377			mode = S_IRUSR \| S_IWUSR \| S_IWGRP;
378			gid = gr->gr_gid;
379			}
380			else
381			#endif /* TTY_GID_SUPPORT */
382			{
383			mode = S_IRUSR \| S_IWUSR \| S_IWGRP \| S_IWOTH;
384			gid = getgid ();
385			}
386			}
387			} ttyconf;
388
389	root	1.36	/////////////////////////////////////////////////////////////////////////////
390
391	root	1.16	void
392	root	1.36	rxvt_ptytty_unix::privileges (rxvt_privaction action)
393	root	1.16	{
394	root	1.26	if (!name \|\| !*name)
395	root	1.23	return;
396
397	root	1.16	if (action == SAVE)
398			{
399			# ifndef RESET_TTY_TO_COMMON_DEFAULTS
400			/* store original tty status for restoration rxvt_clean_exit () -- rgg 04/12/95 */
401			if (lstat (name, &savestat) < 0) /* you lose out */
402	root	1.26	;
403	root	1.16	else
404			# endif
405			{
406	root	1.26	saved = true;
407	root	1.16	chown (name, getuid (), ttyconf.gid); /* fail silently */
408			chmod (name, ttyconf.mode);
409			# ifdef HAVE_REVOKE
410			revoke (name);
411			# endif
412			}
413			}
414			else
415			{ /* action == RESTORE */
416			# ifndef RESET_TTY_TO_COMMON_DEFAULTS
417	root	1.26	if (saved)
418			{
419			chmod (name, savestat.st_mode);
420			chown (name, savestat.st_uid, savestat.st_gid);
421			}
422	root	1.16	# else
423			chmod (name, (S_IRUSR \| S_IWUSR \| S_IRGRP \| S_IWGRP \| S_IROTH \| S_IWOTH));
424			chown (name, 0, 0);
425			# endif
426			}
427			}
428			#endif
429
430	root	1.36	rxvt_ptytty_unix::rxvt_ptytty_unix ()
431	root	1.16	{
432			pty = tty = -1;
433			name = 0;
434	root	1.26	#ifndef NO_SETOWNER_TTYDEV
435			saved = false;
436			#endif
437	root	1.35	#if UTMP_SUPPORT
438			cmd_pid = 0;
439			#endif
440	root	1.16	}
441
442	root	1.36	rxvt_ptytty_unix::~rxvt_ptytty_unix ()
443	root	1.16	{
444	root	1.43	#if UTMP_SUPPORT
445	root	1.35	logout ();
446	root	1.43	#endif
447	root	1.16	put ();
448			}
449
450			void
451	root	1.36	rxvt_ptytty_unix::put ()
452	root	1.16	{
453			#ifndef NO_SETOWNER_TTYDEV
454	root	1.28	privileges (RESTORE);
455	root	1.16	#endif
456
457			if (pty >= 0) close (pty);
458			close_tty ();
459			free (name);
460
461			pty = tty = -1;
462			name = 0;
463			}
464
465			bool
466	root	1.36	rxvt_ptytty_unix::get ()
467	root	1.16	{
468			/* get master (pty) */
469			if ((pty = get_pty (&tty, &name)) < 0)
470			return false;
471
472			fcntl (pty, F_SETFL, O_NONBLOCK);
473
474			/* get slave (tty) */
475			if (tty < 0)
476			{
477			#ifndef NO_SETOWNER_TTYDEV
478			privileges (SAVE);
479			#endif
480
481			if ((tty = get_tty (name)) < 0)
482			{
483			put ();
484			return false;
485			}
486			}
487
488			return true;
489			}
490
491	root	1.40	#if PTYTTY_HELPER
492
493			static int sock_fd;
494			static int pid;
495
496			struct command
497			{
498			enum { get, login, destroy } type;
499
500			rxvt_ptytty *id;
501
502			bool login_shell;
503			int cmd_pid;
504			char hostname[512]; // arbitrary, but should be plenty
505			};
506
507			struct rxvt_ptytty_proxy : zero_initialized, rxvt_ptytty
508			{
509			rxvt_ptytty *id;
510
511			~rxvt_ptytty_proxy ();
512
513			bool get ();
514			void login (int cmd_pid, bool login_shell, const char *hostname);
515			};
516
517			bool
518			rxvt_ptytty_proxy::get ()
519			{
520			command cmd;
521
522			cmd.type = command::get;
523
524			write (sock_fd, &cmd, sizeof (cmd));
525
526			if (read (sock_fd, &id, sizeof (id)) != sizeof (id))
527			rxvt_fatal ("protocol error while creating pty using helper process, aborting.\n");
528
529			if (!id)
530			return false;
531
532			if ((pty = rxvt_recv_fd (sock_fd)) < 0
533			\|\| (tty = rxvt_recv_fd (sock_fd)) < 0)
534			rxvt_fatal ("protocol error while reading pty/tty fds from helper process, aborting.\n");
535
536			return true;
537			}
538
539			void
540			rxvt_ptytty_proxy::login (int cmd_pid, bool login_shell, const char *hostname)
541			{
542			command cmd;
543
544			cmd.type = command::login;
545			cmd.id = id;
546			cmd.cmd_pid = cmd_pid;
547			cmd.login_shell = login_shell;
548			strncpy (cmd.hostname, hostname, sizeof (cmd.hostname));
549
550			write (sock_fd, &cmd, sizeof (cmd));
551			}
552
553			rxvt_ptytty_proxy::~rxvt_ptytty_proxy ()
554			{
555			command cmd;
556
557			cmd.type = command::destroy;
558			cmd.id = id;
559
560			write (sock_fd, &cmd, sizeof (cmd));
561			}
562
563			static
564			void serve ()
565			{
566			command cmd;
567			vector<rxvt_ptytty *> ptys;
568
569			while (read (sock_fd, &cmd, sizeof (command)) == sizeof (command))
570			{
571			if (cmd.type == command::get)
572			{
573			// -> id ptyfd ttyfd
574			cmd.id = new rxvt_ptytty_unix;
575
576			if (cmd.id->get ())
577			{
578			write (sock_fd, &cmd.id, sizeof (cmd.id));
579			ptys.push_back (cmd.id);
580
581			rxvt_send_fd (sock_fd, cmd.id->pty);
582			rxvt_send_fd (sock_fd, cmd.id->tty);
583			}
584			else
585			{
586			delete cmd.id;
587			cmd.id = 0;
588			write (sock_fd, &cmd.id, sizeof (cmd.id));
589			}
590			}
591			else if (cmd.type == command::login)
592			{
593	root	1.43	#if UTMP_SUPPORT
594	root	1.40	if (find (ptys.begin (), ptys.end (), cmd.id))
595			{
596			cmd.hostname[sizeof (cmd.hostname) - 1] = 0;
597			cmd.id->login (cmd.cmd_pid, cmd.login_shell, cmd.hostname);
598			}
599	root	1.43	#endif
600	root	1.40	}
601			else if (cmd.type == command::destroy)
602			{
603			rxvt_ptytty **pty = find (ptys.begin (), ptys.end (), cmd.id);
604
605	root	1.42	if (pty)
606	root	1.40	{
607	root	1.42	delete *pty;
608	root	1.40	ptys.erase (pty);
609			}
610			}
611			else
612			break;
613			}
614
615			// destroy all ptys
616			for (rxvt_ptytty **i = ptys.end (); i-- > ptys.begin (); )
617			delete *i;
618			}
619
620			void rxvt_ptytty_server ()
621			{
622			int sv[2];
623
624			if (socketpair (AF_UNIX, SOCK_STREAM, 0, sv))
625			rxvt_fatal ("could not create socket to communicate with pty/sessiondb helper, aborting.\n");
626
627			pid = fork ();
628
629			if (pid < 0)
630			rxvt_fatal ("could not create pty/sessiondb helper process, aborting.\n");
631
632			if (pid)
633			{
634			// client, urxvt
635			sock_fd = sv[0];
636			close (sv[1]);
637			fcntl (sock_fd, F_SETFD, FD_CLOEXEC);
638			}
639			else
640			{
641	root	1.41	setgid (getegid ());
642			setuid (geteuid ());
643
644	root	1.40	// server, pty-helper
645			sock_fd = sv[1];
646
647	root	1.41	for (int fd = 0; fd < 1023; fd++)
648	root	1.42	if (fd != sock_fd && fd != 1)
649	root	1.41	close (fd);
650	root	1.40
651			serve ();
652			_exit (EXIT_SUCCESS);
653			}
654			}
655			#endif
656
657	root	1.39	// a "factory" g
658	root	1.40	rxvt_ptytty *
659			rxvt_new_ptytty ()
660	root	1.39	{
661	root	1.40	#if PTYTTY_HELPER
662			if (pid > 0)
663	root	1.41	// use helper process
664			return new rxvt_ptytty_proxy;
665	root	1.40	else
666			#endif
667			return new rxvt_ptytty_unix;
668	root	1.39	}
669
670	pcg	1.1	/----------------------- end-of-file (C source) -----------------------/
671	root	1.16