1 |
/*--------------------------------*-C-*---------------------------------* |
2 |
* File: ptytty.C |
3 |
*----------------------------------------------------------------------* |
4 |
* |
5 |
* All portions of code are copyright by their respective author/s. |
6 |
* Copyright (c) 1999-2001 Geoff Wing <gcw@pobox.com> |
7 |
* Copyright (c) 2004-2006 Marc Lehmann <pcg@goof.com> |
8 |
* |
9 |
* This program is free software; you can redistribute it and/or modify |
10 |
* it under the terms of the GNU General Public License as published by |
11 |
* the Free Software Foundation; either version 2 of the License, or |
12 |
* (at your option) any later version. |
13 |
* |
14 |
* This program is distributed in the hope that it will be useful, |
15 |
* but WITHOUT ANY WARRANTY; without even the implied warranty of |
16 |
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
17 |
* GNU General Public License for more details. |
18 |
* |
19 |
* You should have received a copy of the GNU General Public License |
20 |
* along with this program; if not, write to the Free Software |
21 |
* Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. |
22 |
*---------------------------------------------------------------------*/ |
23 |
|
24 |
#include "../config.h" /* NECESSARY */ |
25 |
#include "rxvt.h" |
26 |
|
27 |
# include <cstdlib> |
28 |
# include <cstring> |
29 |
|
30 |
#ifdef HAVE_SYS_TYPES_H |
31 |
# include <sys/types.h> |
32 |
#endif |
33 |
#ifdef HAVE_UNISTD_H |
34 |
# include <unistd.h> |
35 |
#endif |
36 |
#ifdef HAVE_FCNTL_H |
37 |
# include <fcntl.h> |
38 |
#endif |
39 |
#ifdef HAVE_SYS_IOCTL_H |
40 |
# include <sys/ioctl.h> |
41 |
#endif |
42 |
#if defined(PTYS_ARE_PTMX) && defined(HAVE_SYS_STROPTS_H) |
43 |
# include <sys/stropts.h> /* for I_PUSH */ |
44 |
#endif |
45 |
#ifdef HAVE_ISASTREAM |
46 |
# include <stropts.h> |
47 |
#endif |
48 |
#if defined(HAVE_PTY_H) |
49 |
# include <pty.h> |
50 |
#elif defined(HAVE_LIBUTIL_H) |
51 |
# include <libutil.h> |
52 |
#elif defined(HAVE_UTIL_H) |
53 |
# include <util.h> |
54 |
#endif |
55 |
|
56 |
#include <cstdio> |
57 |
#include <grp.h> |
58 |
|
59 |
///////////////////////////////////////////////////////////////////////////// |
60 |
|
61 |
/* ------------------------------------------------------------------------- * |
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 |
static int |
70 |
get_pty (int *fd_tty, char **ttydev) |
71 |
{ |
72 |
int pfd; |
73 |
|
74 |
#ifdef PTYS_ARE_OPENPTY |
75 |
char tty_name[sizeof "/dev/pts/????\0"]; |
76 |
|
77 |
rxvt_privileges(RESTORE); |
78 |
int res = openpty (&pfd, fd_tty, tty_name, NULL, NULL); |
79 |
rxvt_privileges(IGNORE); |
80 |
|
81 |
if (res != -1) |
82 |
{ |
83 |
*ttydev = strdup (tty_name); |
84 |
return pfd; |
85 |
} |
86 |
#endif |
87 |
|
88 |
#ifdef PTYS_ARE__GETPTY |
89 |
*ttydev = _getpty (&pfd, O_RDWR | O_NONBLOCK | O_NOCTTY, 0622, 0); |
90 |
if (*ttydev != NULL) |
91 |
return pfd; |
92 |
#endif |
93 |
|
94 |
#if defined(HAVE_GRANTPT) && defined(HAVE_UNLOCKPT) |
95 |
# if defined(PTYS_ARE_GETPT) || defined(PTYS_ARE_POSIX) || defined(PTYS_ARE_PTMX) |
96 |
|
97 |
{ |
98 |
# ifdef PTYS_ARE_GETPT |
99 |
pfd = getpt(); |
100 |
# else |
101 |
# ifdef PTYS_ARE_POSIX |
102 |
pfd = posix_openpt (O_RDWR); |
103 |
# else |
104 |
pfd = open ("/dev/ptmx", O_RDWR | O_NOCTTY, 0); |
105 |
# endif |
106 |
# endif |
107 |
|
108 |
if (pfd >= 0) |
109 |
{ |
110 |
if (grantpt (pfd) == 0 /* change slave permissions */ |
111 |
&& unlockpt (pfd) == 0) |
112 |
{ /* slave now unlocked */ |
113 |
*ttydev = strdup (ptsname (pfd)); /* get slave's name */ |
114 |
return pfd; |
115 |
} |
116 |
close (pfd); |
117 |
} |
118 |
} |
119 |
# endif |
120 |
#endif |
121 |
|
122 |
#ifdef PTYS_ARE_PTC |
123 |
if ((pfd = open ("/dev/ptc", O_RDWR | O_NOCTTY, 0)) >= 0) |
124 |
{ |
125 |
*ttydev = strdup (ttyname (pfd)); |
126 |
return pfd; |
127 |
} |
128 |
#endif |
129 |
|
130 |
#ifdef PTYS_ARE_CLONE |
131 |
if ((pfd = open ("/dev/ptym/clone", O_RDWR | O_NOCTTY, 0)) >= 0) |
132 |
{ |
133 |
*ttydev = strdup (ptsname (pfd)); |
134 |
return pfd; |
135 |
} |
136 |
#endif |
137 |
|
138 |
#ifdef PTYS_ARE_NUMERIC |
139 |
{ |
140 |
int idx; |
141 |
char *c1, *c2; |
142 |
char pty_name[] = "/dev/ptyp???"; |
143 |
char tty_name[] = "/dev/ttyp???"; |
144 |
|
145 |
c1 = &(pty_name[sizeof (pty_name) - 4]); |
146 |
c2 = &(tty_name[sizeof (tty_name) - 4]); |
147 |
for (idx = 0; idx < 256; idx++) |
148 |
{ |
149 |
sprintf (c1, "%d", idx); |
150 |
sprintf (c2, "%d", idx); |
151 |
if (access (tty_name, F_OK) < 0) |
152 |
{ |
153 |
idx = 256; |
154 |
break; |
155 |
} |
156 |
|
157 |
if ((pfd = open (pty_name, O_RDWR | O_NOCTTY, 0)) >= 0) |
158 |
{ |
159 |
if (access (tty_name, R_OK | W_OK) == 0) |
160 |
{ |
161 |
*ttydev = strdup (tty_name); |
162 |
return pfd; |
163 |
} |
164 |
|
165 |
close (pfd); |
166 |
} |
167 |
} |
168 |
} |
169 |
#endif |
170 |
|
171 |
#ifdef PTYS_ARE_SEARCHED |
172 |
{ |
173 |
const char *c1, *c2; |
174 |
char pty_name[] = "/dev/pty??"; |
175 |
char tty_name[] = "/dev/tty??"; |
176 |
|
177 |
# ifndef PTYCHAR1 |
178 |
# define PTYCHAR1 "pqrstuvwxyz" |
179 |
# endif |
180 |
# ifndef PTYCHAR2 |
181 |
# define PTYCHAR2 "0123456789abcdef" |
182 |
# endif |
183 |
|
184 |
for (c1 = PTYCHAR1; *c1; c1++) |
185 |
{ |
186 |
pty_name[ (sizeof (pty_name) - 3)] = |
187 |
tty_name[ (sizeof (pty_name) - 3)] = *c1; |
188 |
for (c2 = PTYCHAR2; *c2; c2++) |
189 |
{ |
190 |
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 |
{ |
194 |
if (access (tty_name, R_OK | W_OK) == 0) |
195 |
{ |
196 |
*ttydev = strdup (tty_name); |
197 |
return pfd; |
198 |
} |
199 |
|
200 |
close (pfd); |
201 |
} |
202 |
} |
203 |
} |
204 |
} |
205 |
#endif |
206 |
|
207 |
return -1; |
208 |
} |
209 |
|
210 |
/*----------------------------------------------------------------------*/ |
211 |
/* |
212 |
* Returns tty file descriptor, or -1 on failure |
213 |
*/ |
214 |
static int |
215 |
get_tty (char *ttydev) |
216 |
{ |
217 |
return open (ttydev, O_RDWR | O_NOCTTY, 0); |
218 |
} |
219 |
|
220 |
/*----------------------------------------------------------------------*/ |
221 |
/* |
222 |
* Make our tty a controlling tty so that /dev/tty points to us |
223 |
*/ |
224 |
static int |
225 |
control_tty (int fd_tty) |
226 |
{ |
227 |
int fd; |
228 |
|
229 |
/* ---------------------------------------- */ |
230 |
# ifdef HAVE_SETSID |
231 |
setsid (); |
232 |
# endif |
233 |
# if defined(HAVE_SETPGID) |
234 |
setpgid (0, 0); |
235 |
# elif defined(HAVE_SETPGRP) |
236 |
setpgrp (0, 0); |
237 |
# endif |
238 |
|
239 |
/* ---------------------------------------- */ |
240 |
# ifdef TIOCNOTTY |
241 |
fd = open ("/dev/tty", O_RDWR | O_NOCTTY); |
242 |
if (fd >= 0) |
243 |
{ |
244 |
ioctl (fd, TIOCNOTTY, NULL); /* void tty associations */ |
245 |
close (fd); |
246 |
} |
247 |
# endif |
248 |
|
249 |
/* ---------------------------------------- */ |
250 |
fd = open ("/dev/tty", O_RDWR | O_NOCTTY); |
251 |
if (fd >= 0) |
252 |
close (fd); /* ouch: still have controlling tty */ |
253 |
|
254 |
/* ---------------------------------------- */ |
255 |
# if defined(PTYS_ARE_PTMX) && defined(I_PUSH) |
256 |
/* |
257 |
* Push STREAMS modules: |
258 |
* ptem: pseudo-terminal hardware emulation module. |
259 |
* ldterm: standard terminal line discipline. |
260 |
* ttcompat: V7, 4BSD and XENIX STREAMS compatibility module. |
261 |
* |
262 |
* After we push the STREAMS modules, the first open () on the slave side |
263 |
* (i.e. the next section between the dashes giving us "tty opened OK") |
264 |
* should make the "ptem" (or "ldterm" depending upon either which OS |
265 |
* version or which set of manual pages you have) module give us a |
266 |
* controlling terminal. We must already have close ()d the master side |
267 |
* fd in this child process before we push STREAMS modules on because the |
268 |
* documentation is really unclear about whether it is any close () on |
269 |
* the master side or the last close () - i.e. a proper STREAMS dismantling |
270 |
* close () - on the master side which causes a hang up to be sent |
271 |
* through - Geoff Wing |
272 |
*/ |
273 |
# ifdef HAVE_ISASTREAM |
274 |
if (isastream (fd_tty) == 1) |
275 |
# endif |
276 |
{ |
277 |
ioctl (fd_tty, I_PUSH, "ptem"); |
278 |
ioctl (fd_tty, I_PUSH, "ldterm"); |
279 |
ioctl (fd_tty, I_PUSH, "ttcompat"); |
280 |
} |
281 |
# endif |
282 |
/* ---------------------------------------- */ |
283 |
fd = ioctl (fd_tty, TIOCSCTTY, NULL); |
284 |
/* ---------------------------------------- */ |
285 |
fd = open ("/dev/tty", O_WRONLY); |
286 |
if (fd < 0) |
287 |
return -1; /* fatal */ |
288 |
close (fd); |
289 |
/* ---------------------------------------- */ |
290 |
|
291 |
return 0; |
292 |
} |
293 |
|
294 |
void |
295 |
rxvt_ptytty::close_tty () |
296 |
{ |
297 |
if (tty < 0) |
298 |
return; |
299 |
|
300 |
close (tty); |
301 |
tty = -1; |
302 |
} |
303 |
|
304 |
bool |
305 |
rxvt_ptytty::make_controlling_tty () |
306 |
{ |
307 |
return control_tty (tty) >= 0; |
308 |
} |
309 |
|
310 |
void |
311 |
rxvt_ptytty::set_utf8_mode (bool on) |
312 |
{ |
313 |
#ifdef IUTF8 |
314 |
if (pty < 0) |
315 |
return; |
316 |
|
317 |
struct termios tio; |
318 |
|
319 |
if (tcgetattr (pty, &tio) != -1) |
320 |
{ |
321 |
tcflag_t new_cflag = tio.c_iflag; |
322 |
|
323 |
if (on) |
324 |
new_cflag |= IUTF8; |
325 |
else |
326 |
new_cflag &= ~IUTF8; |
327 |
|
328 |
if (new_cflag != tio.c_iflag) |
329 |
{ |
330 |
tio.c_iflag = new_cflag; |
331 |
tcsetattr (pty, TCSANOW, &tio); |
332 |
} |
333 |
} |
334 |
#endif |
335 |
} |
336 |
|
337 |
///////////////////////////////////////////////////////////////////////////// |
338 |
|
339 |
#ifndef NO_SETOWNER_TTYDEV |
340 |
static struct ttyconf { |
341 |
gid_t gid; |
342 |
mode_t mode; |
343 |
|
344 |
ttyconf () |
345 |
{ |
346 |
#ifdef TTY_GID_SUPPORT |
347 |
struct group *gr = getgrnam ("tty"); |
348 |
|
349 |
if (gr) |
350 |
{ /* change group ownership of tty to "tty" */ |
351 |
mode = S_IRUSR | S_IWUSR | S_IWGRP; |
352 |
gid = gr->gr_gid; |
353 |
} |
354 |
else |
355 |
#endif /* TTY_GID_SUPPORT */ |
356 |
{ |
357 |
mode = S_IRUSR | S_IWUSR | S_IWGRP | S_IWOTH; |
358 |
gid = getgid (); |
359 |
} |
360 |
} |
361 |
} ttyconf; |
362 |
|
363 |
///////////////////////////////////////////////////////////////////////////// |
364 |
|
365 |
void |
366 |
rxvt_ptytty_unix::privileges (rxvt_privaction action) |
367 |
{ |
368 |
if (!name || !*name) |
369 |
return; |
370 |
|
371 |
rxvt_privileges (RESTORE); |
372 |
|
373 |
if (action == SAVE) |
374 |
{ |
375 |
# ifndef RESET_TTY_TO_COMMON_DEFAULTS |
376 |
/* store original tty status for restoration rxvt_clean_exit () -- rgg 04/12/95 */ |
377 |
if (lstat (name, &savestat) < 0) /* you lose out */ |
378 |
; |
379 |
else |
380 |
# endif |
381 |
{ |
382 |
saved = true; |
383 |
chown (name, getuid (), ttyconf.gid); /* fail silently */ |
384 |
chmod (name, ttyconf.mode); |
385 |
# ifdef HAVE_REVOKE |
386 |
revoke (name); |
387 |
# endif |
388 |
} |
389 |
} |
390 |
else |
391 |
{ /* action == RESTORE */ |
392 |
# ifndef RESET_TTY_TO_COMMON_DEFAULTS |
393 |
if (saved) |
394 |
{ |
395 |
chmod (name, savestat.st_mode); |
396 |
chown (name, savestat.st_uid, savestat.st_gid); |
397 |
} |
398 |
# else |
399 |
chmod (name, (S_IRUSR | S_IWUSR | S_IRGRP | S_IWGRP | S_IROTH | S_IWOTH)); |
400 |
chown (name, 0, 0); |
401 |
# endif |
402 |
|
403 |
} |
404 |
|
405 |
rxvt_privileges (IGNORE); |
406 |
} |
407 |
#endif |
408 |
|
409 |
rxvt_ptytty_unix::rxvt_ptytty_unix () |
410 |
{ |
411 |
pty = tty = -1; |
412 |
name = 0; |
413 |
#ifndef NO_SETOWNER_TTYDEV |
414 |
saved = false; |
415 |
#endif |
416 |
#if UTMP_SUPPORT |
417 |
cmd_pid = 0; |
418 |
#endif |
419 |
} |
420 |
|
421 |
rxvt_ptytty_unix::~rxvt_ptytty_unix () |
422 |
{ |
423 |
logout (); |
424 |
put (); |
425 |
} |
426 |
|
427 |
void |
428 |
rxvt_ptytty_unix::put () |
429 |
{ |
430 |
#ifndef NO_SETOWNER_TTYDEV |
431 |
privileges (RESTORE); |
432 |
#endif |
433 |
|
434 |
if (pty >= 0) close (pty); |
435 |
close_tty (); |
436 |
free (name); |
437 |
|
438 |
pty = tty = -1; |
439 |
name = 0; |
440 |
} |
441 |
|
442 |
bool |
443 |
rxvt_ptytty_unix::get () |
444 |
{ |
445 |
/* get master (pty) */ |
446 |
if ((pty = get_pty (&tty, &name)) < 0) |
447 |
return false; |
448 |
|
449 |
fcntl (pty, F_SETFL, O_NONBLOCK); |
450 |
|
451 |
/* get slave (tty) */ |
452 |
if (tty < 0) |
453 |
{ |
454 |
#ifndef NO_SETOWNER_TTYDEV |
455 |
privileges (SAVE); |
456 |
#endif |
457 |
|
458 |
if ((tty = get_tty (name)) < 0) |
459 |
{ |
460 |
put (); |
461 |
return false; |
462 |
} |
463 |
} |
464 |
|
465 |
return true; |
466 |
} |
467 |
|
468 |
/*----------------------- end-of-file (C source) -----------------------*/ |
469 |
|