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Comparing libptytty/src/ptytty.C (file contents):
Revision 1.31 by ayin, Thu Nov 15 10:49:05 2007 UTC vs.
Revision 1.48 by root, Wed Jan 18 12:19:31 2012 UTC

1// This file is part of libptytty. Do not make local modifications.
2// http://software.schmorp.de/pkg/libptytty
3
4/*----------------------------------------------------------------------* 1/*----------------------------------------------------------------------*
5 * File: ptytty.C 2 * File: ptytty.C
6 *----------------------------------------------------------------------* 3 *----------------------------------------------------------------------*
7 * 4 *
8 * All portions of code are copyright by their respective author/s. 5 * All portions of code are copyright by their respective author/s.
9 * Copyright (c) 1999-2001 Geoff Wing <gcw@pobox.com> 6 * Copyright (c) 1999-2001 Geoff Wing <gcw@pobox.com>
10 * Copyright (c) 2004-2006 Marc Lehmann <pcg@goof.com> 7 * Copyright (c) 2004-2006 Marc Lehmann <schmorp@schmorp.de>
11 * Copyright (c) 2006 Emanuele Giaquinta <e.giaquinta@glauco.it> 8 * Copyright (c) 2006 Emanuele Giaquinta <e.giaquinta@glauco.it>
12 * 9 *
13 * This program is free software; you can redistribute it and/or modify 10 * This program is free software; you can redistribute it and/or modify
14 * it under the terms of the GNU General Public License as published by 11 * it under the terms of the GNU General Public License as published by
15 * the Free Software Foundation; either version 2 of the License, or 12 * the Free Software Foundation; either version 2 of the License, or
… …
23 * You should have received a copy of the GNU General Public License 20 * You should have received a copy of the GNU General Public License
24 * along with this program; if not, write to the Free Software 21 * along with this program; if not, write to the Free Software
25 * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. 22 * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
26 *---------------------------------------------------------------------*/ 23 *---------------------------------------------------------------------*/
27 24
28#include "../config.h" 25#include "config.h"
29 26
30#include "ptytty.h" 27#include "ptytty.h"
31 28
32#include <cstdlib> 29#include <cstdlib>
30#include <cstdio>
33#include <cstring> 31#include <cstring>
34#include <csignal>
35 32
36#include <sys/types.h> 33#include <sys/types.h>
34#include <sys/stat.h>
37#include <unistd.h> 35#include <unistd.h>
38#include <fcntl.h> 36#include <fcntl.h>
39 37
40#ifdef HAVE_SYS_IOCTL_H 38#ifdef HAVE_SYS_IOCTL_H
41# include <sys/ioctl.h> 39# include <sys/ioctl.h>
42#endif 40#endif
43#if defined(HAVE_DEV_PTMX) && defined(HAVE_SYS_STROPTS_H) 41#if defined(HAVE_SYS_STROPTS_H)
44# include <sys/stropts.h> /* for I_PUSH */ 42# include <sys/stropts.h> /* for I_PUSH */
45#endif 43#endif
46#ifdef HAVE_ISASTREAM 44#if defined(HAVE_ISASTREAM) && defined(HAVE_STROPTS_H)
47# include <stropts.h> 45# include <stropts.h>
48#endif 46#endif
49#if defined(HAVE_PTY_H) 47#if defined(HAVE_PTY_H)
50# include <pty.h> 48# include <pty.h>
51#elif defined(HAVE_LIBUTIL_H) 49#elif defined(HAVE_LIBUTIL_H)
… …
55#endif 53#endif
56#ifdef TTY_GID_SUPPORT 54#ifdef TTY_GID_SUPPORT
57#include <grp.h> 55#include <grp.h>
58#endif 56#endif
59 57
60#include <cstdio> 58#ifndef O_NOCTTY
59# define O_NOCTTY 0
60#endif
61 61
62///////////////////////////////////////////////////////////////////////////// 62/////////////////////////////////////////////////////////////////////////////
63 63
64/* ------------------------------------------------------------------------- * 64/* ------------------------------------------------------------------------- *
65 * GET PSEUDO TELETYPE - MASTER AND SLAVE * 65 * GET PSEUDO TELETYPE - MASTER AND SLAVE *
… …
75 get_pty (int *fd_tty, char **ttydev) 75 get_pty (int *fd_tty, char **ttydev)
76 { 76 {
77 int pfd; 77 int pfd;
78 78
79# if defined(HAVE_GETPT) 79# if defined(HAVE_GETPT)
80 pfd = getpt(); 80 pfd = getpt ();
81# elif defined(HAVE_POSIX_OPENPT) 81# elif defined(HAVE_POSIX_OPENPT)
82 pfd = posix_openpt (O_RDWR); 82 pfd = posix_openpt (O_RDWR | O_NOCTTY);
83# else 83# else
84# ifdef _AIX
84 pfd = open (CLONE_DEVICE, O_RDWR | O_NOCTTY, 0); 85 pfd = open ("/dev/ptc", O_RDWR | O_NOCTTY, 0);
86# else
87 pfd = open ("/dev/ptmx", O_RDWR | O_NOCTTY, 0);
88# endif
85# endif 89# endif
86 90
87 if (pfd >= 0) 91 if (pfd >= 0)
88 { 92 {
89 if (grantpt (pfd) == 0 /* change slave permissions */ 93 if (grantpt (pfd) == 0 /* change slave permissions */
90 && unlockpt (pfd) == 0) 94 && unlockpt (pfd) == 0)
95 {
91 { /* slave now unlocked */ 96 /* slave now unlocked */
92 *ttydev = strdup (ptsname (pfd)); /* get slave's name */ 97 *ttydev = strdup (ptsname (pfd)); /* get slave's name */
93 return pfd; 98 return pfd;
94 } 99 }
95 100
96 close (pfd); 101 close (pfd);
… …
124 get_pty (int *fd_tty, char **ttydev) 129 get_pty (int *fd_tty, char **ttydev)
125 { 130 {
126 int pfd; 131 int pfd;
127 char *slave; 132 char *slave;
128 133
129 slave = _getpty (&pfd, O_RDWR | O_NONBLOCK | O_NOCTTY, 0622, 0); 134 slave = _getpty (&pfd, O_RDWR | O_NOCTTY, 0622, 0);
130 135
131 if (slave != NULL) { 136 if (slave != NULL)
132 *ttydev = strdup (slave);
133 return pfd;
134 }
135
136 return -1;
137 }
138
139#elif defined(HAVE_DEV_PTC)
140
141 static int
142 get_pty (int *fd_tty, char **ttydev)
143 {
144 int pfd;
145
146 if ((pfd = open ("/dev/ptc", O_RDWR | O_NOCTTY, 0)) >= 0)
147 { 137 {
148 *ttydev = strdup (ttyname (pfd));
149 return pfd;
150 }
151
152 return -1;
153 }
154
155#elif defined(HAVE_DEV_CLONE)
156
157 static int
158 get_pty (int *fd_tty, char **ttydev)
159 {
160 int pfd;
161
162 if ((pfd = open ("/dev/ptym/clone", O_RDWR | O_NOCTTY, 0)) >= 0)
163 {
164 *ttydev = strdup (ptsname (pfd)); 138 *ttydev = strdup (slave);
165 return pfd; 139 return pfd;
166 } 140 }
167 141
168 return -1; 142 return -1;
169 } 143 }
… …
181 const char *majors = "pqrstuvwxyzabcde"; 155 const char *majors = "pqrstuvwxyzabcde";
182 const char *minors = "0123456789abcdef"; 156 const char *minors = "0123456789abcdef";
183 157
184 for (i = 0; i < 256; i++) 158 for (i = 0; i < 256; i++)
185 { 159 {
186 snprintf(pty_name, 32, "/dev/pty%c%c", majors[i / 16], minors[i % 16]); 160 snprintf (pty_name, 32, "/dev/pty%c%c", majors[i / 16], minors[i % 16]);
187 snprintf(tty_name, 32, "/dev/tty%c%c", majors[i / 16], minors[i % 16]); 161 snprintf (tty_name, 32, "/dev/tty%c%c", majors[i / 16], minors[i % 16]);
188 162
189 if ((pfd = open (pty_name, O_RDWR | O_NOCTTY, 0)) == -1) 163 if ((pfd = open (pty_name, O_RDWR | O_NOCTTY, 0)) == -1)
190 { 164 {
191 snprintf(pty_name, 32, "/dev/ptyp%d", i); 165 snprintf (pty_name, 32, "/dev/ptyp%d", i);
192 snprintf(tty_name, 32, "/dev/ttyp%d", i); 166 snprintf (tty_name, 32, "/dev/ttyp%d", i);
193 if ((pfd = open (pty_name, O_RDWR | O_NOCTTY, 0)) == -1) 167 if ((pfd = open (pty_name, O_RDWR | O_NOCTTY, 0)) == -1)
194 continue; 168 continue;
195 } 169 }
196 170
197 if (access (tty_name, R_OK | W_OK) == 0) 171 if (access (tty_name, R_OK | W_OK) == 0)
… …
227{ 201{
228 int fd; 202 int fd;
229 203
230 setsid (); 204 setsid ();
231 205
232#if defined(HAVE_DEV_PTMX) && defined(I_PUSH) 206#ifdef TIOCSCTTY
207 ioctl (fd_tty, TIOCSCTTY, NULL);
208#else
209 fd = open (ttyname (fd_tty), O_RDWR);
210 if (fd >= 0)
211 close (fd);
212#endif
213
214 fd = open ("/dev/tty", O_WRONLY);
215 if (fd < 0)
216 return -1; /* fatal */
217
218 close (fd);
219
220 return 0;
221}
222
223void
224ptytty::close_tty ()
225{
226 if (tty < 0)
227 return;
228
229 close (tty);
230 tty = -1;
231}
232
233bool
234ptytty::make_controlling_tty ()
235{
236 return control_tty (tty) >= 0;
237}
238
239void
240ptytty::set_utf8_mode (bool on)
241{
242#ifdef IUTF8
243 if (pty < 0)
244 return;
245
246 struct termios tio;
247
248 if (tcgetattr (pty, &tio) != -1)
249 {
250 tcflag_t new_cflag = tio.c_iflag;
251
252 if (on)
253 new_cflag |= IUTF8;
254 else
255 new_cflag &= ~IUTF8;
256
257 if (new_cflag != tio.c_iflag)
258 {
259 tio.c_iflag = new_cflag;
260 tcsetattr (pty, TCSANOW, &tio);
261 }
262 }
263#endif
264}
265
266static struct ttyconf {
267 gid_t gid;
268 mode_t mode;
269
270 ttyconf ()
271 {
272#ifdef TTY_GID_SUPPORT
273 struct group *gr = getgrnam ("tty");
274
275 if (gr)
276 {
277 /* change group ownership of tty to "tty" */
278 mode = S_IRUSR | S_IWUSR | S_IWGRP;
279 gid = gr->gr_gid;
280 }
281 else
282#endif /* TTY_GID_SUPPORT */
283 {
284 mode = S_IRUSR | S_IWUSR | S_IWGRP | S_IWOTH;
285 gid = 0;
286 }
287 }
288} ttyconf;
289
290ptytty_unix::ptytty_unix ()
291{
292 name = 0;
293#if UTMP_SUPPORT
294 cmd_pid = 0;
295#endif
296}
297
298ptytty_unix::~ptytty_unix ()
299{
300#if UTMP_SUPPORT
301 logout ();
302#endif
303 put ();
304}
305
306void
307ptytty_unix::put ()
308{
309 if (name)
310 {
311 chmod (name, RESTORE_TTY_MODE);
312 chown (name, 0, ttyconf.gid);
313 }
314
315 close_tty ();
316
317 if (pty >= 0)
318 close (pty);
319
320 free (name);
321
322 pty = tty = -1;
323 name = 0;
324}
325
326bool
327ptytty_unix::get ()
328{
329 /* get master (pty) */
330 if ((pty = get_pty (&tty, &name)) < 0)
331 return false;
332
333 /* get slave (tty) */
334 if (tty < 0)
335 {
336#ifndef NO_SETOWNER_TTYDEV
337 chown (name, getuid (), ttyconf.gid); /* fail silently */
338 chmod (name, ttyconf.mode);
339# ifdef HAVE_REVOKE
340 revoke (name);
341# endif
342#endif
343
344 if ((tty = get_tty (name)) < 0)
345 {
346 put ();
347 return false;
348 }
349 }
350
351#if defined(I_PUSH)
233 /* 352 /*
234 * Push STREAMS modules: 353 * Push STREAMS modules:
235 * ptem: pseudo-terminal hardware emulation module. 354 * ptem: pseudo-terminal hardware emulation module.
236 * ldterm: standard terminal line discipline. 355 * ldterm: standard terminal line discipline.
237 * ttcompat: V7, 4BSD and XENIX STREAMS compatibility module. 356 * ttcompat: V7, 4BSD and XENIX STREAMS compatibility module.
238 * 357 *
239 * After we push the STREAMS modules, the first open () on the slave side 358 * After we push the STREAMS modules, the first open () on the slave side
240 * (i.e. the next section between the dashes giving us "tty opened OK")
241 * should make the "ptem" (or "ldterm" depending upon either which OS 359 * should make the "ptem" (or "ldterm" depending upon either which OS
242 * version or which set of manual pages you have) module give us a 360 * version or which set of manual pages you have) module give us a
243 * controlling terminal. We must already have close ()d the master side 361 * controlling terminal. We must already have close ()d the master side
244 * fd in this child process before we push STREAMS modules on because the 362 * fd in this child process before we push STREAMS modules on because the
245 * documentation is really unclear about whether it is any close () on 363 * documentation is really unclear about whether it is any close () on
246 * the master side or the last close () - i.e. a proper STREAMS dismantling 364 * the master side or the last close () - i.e. a proper STREAMS dismantling
247 * close () - on the master side which causes a hang up to be sent 365 * close () - on the master side which causes a hang up to be sent
248 * through - Geoff Wing 366 * through - Geoff Wing
249 */ 367 */
250# ifdef HAVE_ISASTREAM 368#if defined(HAVE_ISASTREAM) && defined(HAVE_STROPTS_H)
251 if (isastream (fd_tty) == 1) 369 if (isastream (tty) == 1)
252# endif 370# endif
253 { 371 {
254 ioctl (fd_tty, I_PUSH, "ptem"); 372 ioctl (tty, I_PUSH, "ptem");
255 ioctl (fd_tty, I_PUSH, "ldterm"); 373 ioctl (tty, I_PUSH, "ldterm");
256 ioctl (fd_tty, I_PUSH, "ttcompat"); 374 ioctl (tty, I_PUSH, "ttcompat");
257 }
258#endif
259
260#ifdef TIOCSCTTY
261 ioctl (fd_tty, TIOCSCTTY, NULL);
262#else
263 fd = open (ttyname (fd_tty), O_RDWR);
264 if (fd >= 0)
265 close (fd);
266#endif
267
268 fd = open ("/dev/tty", O_WRONLY);
269 if (fd < 0)
270 return -1; /* fatal */
271
272 close (fd);
273
274 return 0;
275}
276
277void
278ptytty::close_tty ()
279{
280 if (tty < 0)
281 return;
282
283 close (tty);
284 tty = -1;
285}
286
287bool
288ptytty::make_controlling_tty ()
289{
290 return control_tty (tty) >= 0;
291}
292
293void
294ptytty::set_utf8_mode (bool on)
295{
296#ifdef IUTF8
297 if (pty < 0)
298 return;
299
300 struct termios tio;
301
302 if (tcgetattr (pty, &tio) != -1)
303 { 375 }
304 tcflag_t new_cflag = tio.c_iflag;
305
306 if (on)
307 new_cflag |= IUTF8;
308 else
309 new_cflag &= ~IUTF8;
310
311 if (new_cflag != tio.c_iflag)
312 {
313 tio.c_iflag = new_cflag;
314 tcsetattr (pty, TCSANOW, &tio);
315 }
316 }
317#endif 376#endif
318}
319 377
320static struct ttyconf {
321 gid_t gid;
322 mode_t mode;
323
324 ttyconf ()
325 {
326#ifdef TTY_GID_SUPPORT
327 struct group *gr = getgrnam ("tty");
328
329 if (gr)
330 { /* change group ownership of tty to "tty" */
331 mode = S_IRUSR | S_IWUSR | S_IWGRP;
332 gid = gr->gr_gid;
333 }
334 else
335#endif /* TTY_GID_SUPPORT */
336 {
337 mode = S_IRUSR | S_IWUSR | S_IWGRP | S_IWOTH;
338 gid = 0;
339 }
340 }
341} ttyconf;
342
343ptytty_unix::ptytty_unix ()
344{
345 name = 0;
346#if UTMP_SUPPORT 378#if UTMP_SUPPORT
347 cmd_pid = 0; 379# if defined(HAVE_STRUCT_UTMP) && !defined(HAVE_UTMP_PID)
348#endif 380 int fd_stdin = dup (STDIN_FILENO);
349} 381 dup2 (tty, STDIN_FILENO);
350 382
351ptytty_unix::~ptytty_unix () 383 utmp_pos = ttyslot ();
352{
353#if UTMP_SUPPORT
354 logout ();
355#endif
356 put ();
357}
358 384
359void 385 dup2 (fd_stdin, STDIN_FILENO);
360ptytty_unix::put () 386 close (fd_stdin);
361{
362 if (name)
363 {
364 chmod (name, RESTORE_TTY_MODE);
365 chown (name, 0, ttyconf.gid);
366 }
367
368 close_tty ();
369
370 if (pty >= 0)
371 close (pty);
372
373 free (name);
374
375 pty = tty = -1;
376 name = 0;
377}
378
379bool
380ptytty_unix::get ()
381{
382 /* get master (pty) */
383 if ((pty = get_pty (&tty, &name)) < 0)
384 return false;
385
386 fcntl (pty, F_SETFL, O_NONBLOCK);
387
388 /* get slave (tty) */
389 if (tty < 0)
390 {
391#ifndef NO_SETOWNER_TTYDEV
392 chown (name, getuid (), ttyconf.gid); /* fail silently */
393 chmod (name, ttyconf.mode);
394# ifdef HAVE_REVOKE
395 revoke (name);
396# endif 387# endif
397#endif 388#endif
398 389
399 if ((tty = get_tty (name)) < 0)
400 {
401 put ();
402 return false;
403 }
404 }
405
406 return true; 390 return true;
407} 391}
408 392

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