1 |
// This file is part of libptytty. Do not make local modifications. |
2 |
// http://software.schmorp.de/pkg/libptytty |
3 |
|
4 |
/*----------------------------------------------------------------------* |
5 |
* File: ptytty.C |
6 |
*----------------------------------------------------------------------* |
7 |
* |
8 |
* All portions of code are copyright by their respective author/s. |
9 |
* Copyright (c) 1999-2001 Geoff Wing <gcw@pobox.com> |
10 |
* Copyright (c) 2004-2006 Marc Lehmann <pcg@goof.com> |
11 |
* Copyright (c) 2006 Emanuele Giaquinta <e.giaquinta@glauco.it> |
12 |
* |
13 |
* 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 |
15 |
* the Free Software Foundation; either version 2 of the License, or |
16 |
* (at your option) any later version. |
17 |
* |
18 |
* This program is distributed in the hope that it will be useful, |
19 |
* but WITHOUT ANY WARRANTY; without even the implied warranty of |
20 |
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
21 |
* GNU General Public License for more details. |
22 |
* |
23 |
* You should have received a copy of the GNU General Public License |
24 |
* along with this program; if not, write to the Free Software |
25 |
* Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. |
26 |
*---------------------------------------------------------------------*/ |
27 |
|
28 |
#include "../config.h" |
29 |
|
30 |
#include "ptytty.h" |
31 |
|
32 |
#include <cstdlib> |
33 |
#include <cstring> |
34 |
#include <csignal> |
35 |
|
36 |
#include <sys/types.h> |
37 |
#include <unistd.h> |
38 |
#include <fcntl.h> |
39 |
|
40 |
#ifdef HAVE_SYS_IOCTL_H |
41 |
# include <sys/ioctl.h> |
42 |
#endif |
43 |
#if defined(HAVE_DEV_PTMX) && defined(HAVE_SYS_STROPTS_H) |
44 |
# include <sys/stropts.h> /* for I_PUSH */ |
45 |
#endif |
46 |
#ifdef HAVE_ISASTREAM |
47 |
# include <stropts.h> |
48 |
#endif |
49 |
#if defined(HAVE_PTY_H) |
50 |
# include <pty.h> |
51 |
#elif defined(HAVE_LIBUTIL_H) |
52 |
# include <libutil.h> |
53 |
#elif defined(HAVE_UTIL_H) |
54 |
# include <util.h> |
55 |
#endif |
56 |
#ifdef TTY_GID_SUPPORT |
57 |
#include <grp.h> |
58 |
#endif |
59 |
|
60 |
#include <cstdio> |
61 |
|
62 |
///////////////////////////////////////////////////////////////////////////// |
63 |
|
64 |
/* ------------------------------------------------------------------------- * |
65 |
* GET PSEUDO TELETYPE - MASTER AND SLAVE * |
66 |
* ------------------------------------------------------------------------- */ |
67 |
/* |
68 |
* Returns pty file descriptor, or -1 on failure |
69 |
* If successful, ttydev is set to the name of the slave device. |
70 |
* fd_tty _may_ also be set to an open fd to the slave device |
71 |
*/ |
72 |
#if defined(UNIX98_PTY) |
73 |
|
74 |
static int |
75 |
get_pty (int *fd_tty, char **ttydev) |
76 |
{ |
77 |
int pfd; |
78 |
|
79 |
# if defined(HAVE_GETPT) |
80 |
pfd = getpt(); |
81 |
# elif defined(HAVE_POSIX_OPENPT) |
82 |
pfd = posix_openpt (O_RDWR); |
83 |
# else |
84 |
pfd = open (CLONE_DEVICE, O_RDWR | O_NOCTTY, 0); |
85 |
# endif |
86 |
|
87 |
if (pfd >= 0) |
88 |
{ |
89 |
if (grantpt (pfd) == 0 /* change slave permissions */ |
90 |
&& unlockpt (pfd) == 0) |
91 |
{ /* slave now unlocked */ |
92 |
*ttydev = strdup (ptsname (pfd)); /* get slave's name */ |
93 |
return pfd; |
94 |
} |
95 |
|
96 |
close (pfd); |
97 |
} |
98 |
|
99 |
return -1; |
100 |
} |
101 |
|
102 |
#elif defined(HAVE_OPENPTY) |
103 |
|
104 |
static int |
105 |
get_pty (int *fd_tty, char **ttydev) |
106 |
{ |
107 |
int pfd; |
108 |
int res; |
109 |
char tty_name[32]; |
110 |
|
111 |
res = openpty (&pfd, fd_tty, tty_name, NULL, NULL); |
112 |
|
113 |
if (res != -1) |
114 |
{ |
115 |
*ttydev = strdup (tty_name); |
116 |
return pfd; |
117 |
} |
118 |
|
119 |
return -1; |
120 |
} |
121 |
|
122 |
#elif defined(HAVE__GETPTY) |
123 |
|
124 |
static int |
125 |
get_pty (int *fd_tty, char **ttydev) |
126 |
{ |
127 |
int pfd; |
128 |
|
129 |
*ttydev = _getpty (&pfd, O_RDWR | O_NONBLOCK | O_NOCTTY, 0622, 0); |
130 |
|
131 |
if (*ttydev != NULL) |
132 |
return pfd; |
133 |
|
134 |
return -1; |
135 |
} |
136 |
|
137 |
#elif defined(HAVE_DEV_PTC) |
138 |
|
139 |
static int |
140 |
get_pty (int *fd_tty, char **ttydev) |
141 |
{ |
142 |
int pfd; |
143 |
|
144 |
if ((pfd = open ("/dev/ptc", O_RDWR | O_NOCTTY, 0)) >= 0) |
145 |
{ |
146 |
*ttydev = strdup (ttyname (pfd)); |
147 |
return pfd; |
148 |
} |
149 |
|
150 |
return -1; |
151 |
} |
152 |
|
153 |
#elif defined(HAVE_DEV_CLONE) |
154 |
|
155 |
static int |
156 |
get_pty (int *fd_tty, char **ttydev) |
157 |
{ |
158 |
int pfd; |
159 |
|
160 |
if ((pfd = open ("/dev/ptym/clone", O_RDWR | O_NOCTTY, 0)) >= 0) |
161 |
{ |
162 |
*ttydev = strdup (ptsname (pfd)); |
163 |
return pfd; |
164 |
} |
165 |
|
166 |
return -1; |
167 |
} |
168 |
|
169 |
#else |
170 |
|
171 |
/* Based on the code in openssh/openbsd-compat/bsd-openpty.c */ |
172 |
static int |
173 |
get_pty (int *fd_tty, char **ttydev) |
174 |
{ |
175 |
int pfd; |
176 |
int i; |
177 |
char pty_name[32]; |
178 |
char tty_name[32]; |
179 |
const char *majors = "pqrstuvwxyzabcde"; |
180 |
const char *minors = "0123456789abcdef"; |
181 |
|
182 |
for (i = 0; i < 256; i++) |
183 |
{ |
184 |
snprintf(pty_name, 32, "/dev/pty%c%c", majors[i / 16], minors[i % 16]); |
185 |
snprintf(tty_name, 32, "/dev/tty%c%c", majors[i / 16], minors[i % 16]); |
186 |
|
187 |
if ((pfd = open (pty_name, O_RDWR | O_NOCTTY, 0)) == -1) |
188 |
{ |
189 |
snprintf(pty_name, 32, "/dev/ptyp%d", i); |
190 |
snprintf(tty_name, 32, "/dev/ttyp%d", i); |
191 |
if ((pfd = open (pty_name, O_RDWR | O_NOCTTY, 0)) == -1) |
192 |
continue; |
193 |
} |
194 |
|
195 |
if (access (tty_name, R_OK | W_OK) == 0) |
196 |
{ |
197 |
*ttydev = strdup (tty_name); |
198 |
return pfd; |
199 |
} |
200 |
|
201 |
close (pfd); |
202 |
} |
203 |
|
204 |
return -1; |
205 |
} |
206 |
|
207 |
#endif |
208 |
|
209 |
/*----------------------------------------------------------------------*/ |
210 |
/* |
211 |
* Returns tty file descriptor, or -1 on failure |
212 |
*/ |
213 |
static int |
214 |
get_tty (char *ttydev) |
215 |
{ |
216 |
return open (ttydev, O_RDWR | O_NOCTTY, 0); |
217 |
} |
218 |
|
219 |
/*----------------------------------------------------------------------*/ |
220 |
/* |
221 |
* Make our tty a controlling tty so that /dev/tty points to us |
222 |
*/ |
223 |
static int |
224 |
control_tty (int fd_tty) |
225 |
{ |
226 |
setsid (); |
227 |
|
228 |
#if defined(HAVE_DEV_PTMX) && defined(I_PUSH) |
229 |
/* |
230 |
* Push STREAMS modules: |
231 |
* ptem: pseudo-terminal hardware emulation module. |
232 |
* ldterm: standard terminal line discipline. |
233 |
* ttcompat: V7, 4BSD and XENIX STREAMS compatibility module. |
234 |
* |
235 |
* After we push the STREAMS modules, the first open () on the slave side |
236 |
* (i.e. the next section between the dashes giving us "tty opened OK") |
237 |
* should make the "ptem" (or "ldterm" depending upon either which OS |
238 |
* version or which set of manual pages you have) module give us a |
239 |
* controlling terminal. We must already have close ()d the master side |
240 |
* fd in this child process before we push STREAMS modules on because the |
241 |
* documentation is really unclear about whether it is any close () on |
242 |
* the master side or the last close () - i.e. a proper STREAMS dismantling |
243 |
* close () - on the master side which causes a hang up to be sent |
244 |
* through - Geoff Wing |
245 |
*/ |
246 |
# ifdef HAVE_ISASTREAM |
247 |
if (isastream (fd_tty) == 1) |
248 |
# endif |
249 |
{ |
250 |
ioctl (fd_tty, I_PUSH, "ptem"); |
251 |
ioctl (fd_tty, I_PUSH, "ldterm"); |
252 |
ioctl (fd_tty, I_PUSH, "ttcompat"); |
253 |
} |
254 |
#endif |
255 |
|
256 |
ioctl (fd_tty, TIOCSCTTY, NULL); |
257 |
|
258 |
int fd = open ("/dev/tty", O_WRONLY); |
259 |
if (fd < 0) |
260 |
return -1; /* fatal */ |
261 |
|
262 |
close (fd); |
263 |
|
264 |
return 0; |
265 |
} |
266 |
|
267 |
void |
268 |
ptytty::close_tty () |
269 |
{ |
270 |
if (tty < 0) |
271 |
return; |
272 |
|
273 |
close (tty); |
274 |
tty = -1; |
275 |
} |
276 |
|
277 |
bool |
278 |
ptytty::make_controlling_tty () |
279 |
{ |
280 |
return control_tty (tty) >= 0; |
281 |
} |
282 |
|
283 |
void |
284 |
ptytty::set_utf8_mode (bool on) |
285 |
{ |
286 |
#ifdef IUTF8 |
287 |
if (pty < 0) |
288 |
return; |
289 |
|
290 |
struct termios tio; |
291 |
|
292 |
if (tcgetattr (pty, &tio) != -1) |
293 |
{ |
294 |
tcflag_t new_cflag = tio.c_iflag; |
295 |
|
296 |
if (on) |
297 |
new_cflag |= IUTF8; |
298 |
else |
299 |
new_cflag &= ~IUTF8; |
300 |
|
301 |
if (new_cflag != tio.c_iflag) |
302 |
{ |
303 |
tio.c_iflag = new_cflag; |
304 |
tcsetattr (pty, TCSANOW, &tio); |
305 |
} |
306 |
} |
307 |
#endif |
308 |
} |
309 |
|
310 |
static struct ttyconf { |
311 |
gid_t gid; |
312 |
mode_t mode; |
313 |
|
314 |
ttyconf () |
315 |
{ |
316 |
#ifdef TTY_GID_SUPPORT |
317 |
struct group *gr = getgrnam ("tty"); |
318 |
|
319 |
if (gr) |
320 |
{ /* change group ownership of tty to "tty" */ |
321 |
mode = S_IRUSR | S_IWUSR | S_IWGRP; |
322 |
gid = gr->gr_gid; |
323 |
} |
324 |
else |
325 |
#endif /* TTY_GID_SUPPORT */ |
326 |
{ |
327 |
mode = S_IRUSR | S_IWUSR | S_IWGRP | S_IWOTH; |
328 |
gid = 0; |
329 |
} |
330 |
} |
331 |
} ttyconf; |
332 |
|
333 |
ptytty_unix::ptytty_unix () |
334 |
{ |
335 |
name = 0; |
336 |
#if UTMP_SUPPORT |
337 |
cmd_pid = 0; |
338 |
#endif |
339 |
} |
340 |
|
341 |
ptytty_unix::~ptytty_unix () |
342 |
{ |
343 |
#if UTMP_SUPPORT |
344 |
logout (); |
345 |
#endif |
346 |
put (); |
347 |
} |
348 |
|
349 |
void |
350 |
ptytty_unix::put () |
351 |
{ |
352 |
if (name) |
353 |
{ |
354 |
chmod (name, RESTORE_TTY_MODE); |
355 |
chown (name, 0, ttyconf.gid); |
356 |
} |
357 |
|
358 |
close_tty (); |
359 |
|
360 |
if (pty >= 0) |
361 |
close (pty); |
362 |
|
363 |
free (name); |
364 |
|
365 |
pty = tty = -1; |
366 |
name = 0; |
367 |
} |
368 |
|
369 |
bool |
370 |
ptytty_unix::get () |
371 |
{ |
372 |
/* get master (pty) */ |
373 |
if ((pty = get_pty (&tty, &name)) < 0) |
374 |
return false; |
375 |
|
376 |
fcntl (pty, F_SETFL, O_NONBLOCK); |
377 |
|
378 |
/* get slave (tty) */ |
379 |
if (tty < 0) |
380 |
{ |
381 |
#ifndef NO_SETOWNER_TTYDEV |
382 |
chown (name, getuid (), ttyconf.gid); /* fail silently */ |
383 |
chmod (name, ttyconf.mode); |
384 |
# ifdef HAVE_REVOKE |
385 |
revoke (name); |
386 |
# endif |
387 |
#endif |
388 |
|
389 |
if ((tty = get_tty (name)) < 0) |
390 |
{ |
391 |
put (); |
392 |
return false; |
393 |
} |
394 |
} |
395 |
|
396 |
return true; |
397 |
} |
398 |
|