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Comparing libptytty/src/ptytty.C (file contents):
Revision 1.24 by ayin, Sun Sep 10 17:59:21 2006 UTC vs.
Revision 1.49 by sf-exg, Wed Jan 18 20:05:13 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 <stdlib.h>
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 *
66 * ------------------------------------------------------------------------- */ 66 * ------------------------------------------------------------------------- */
67/* 67/*
68 * Returns pty file descriptor, or -1 on failure 68 * Returns pty file descriptor, or -1 on failure
69 * If successful, ttydev is set to the name of the slave device. 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 70 * fd_tty _may_ also be set to an open fd to the slave device
71 */ 71 */
72#if defined(UNIX98_PTY) 72#if defined(UNIX98_PTY)
73
73static int 74 static int
74get_pty (int *fd_tty, char **ttydev) 75 get_pty (int *fd_tty, char **ttydev)
75{ 76 {
76 int pfd; 77 int pfd;
77 78
78# if defined(HAVE_GETPT) 79# if defined(HAVE_GETPT)
79 pfd = getpt(); 80 pfd = getpt ();
80# elif defined(HAVE_POSIX_OPENPT) 81# elif defined(HAVE_POSIX_OPENPT)
81 pfd = posix_openpt (O_RDWR); 82 pfd = posix_openpt (O_RDWR | O_NOCTTY);
82# else 83# else
84# ifdef _AIX
83 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
84# endif 89# endif
90
85 if (pfd >= 0) 91 if (pfd >= 0)
86 { 92 {
87 if (grantpt (pfd) == 0 /* change slave permissions */ 93 if (grantpt (pfd) == 0 /* change slave permissions */
88 && unlockpt (pfd) == 0) 94 && unlockpt (pfd) == 0)
95 {
89 { /* slave now unlocked */ 96 /* slave now unlocked */
90 *ttydev = strdup (ptsname (pfd)); /* get slave's name */ 97 *ttydev = strdup (ptsname (pfd)); /* get slave's name */
91 return pfd; 98 return pfd;
92 } 99 }
93 100
94 close (pfd); 101 close (pfd);
95 } 102 }
96 103
97 return -1; 104 return -1;
98} 105 }
106
99#elif defined(HAVE_OPENPTY) 107#elif defined(HAVE_OPENPTY)
108
100static int 109 static int
101get_pty (int *fd_tty, char **ttydev) 110 get_pty (int *fd_tty, char **ttydev)
102{ 111 {
103 int pfd; 112 int pfd;
104 int res; 113 int res;
105 char tty_name[32]; 114
106
107 res = openpty (&pfd, fd_tty, tty_name, NULL, NULL); 115 res = openpty (&pfd, fd_tty, NULL, NULL, NULL);
116
108 if (res != -1) 117 if (res != -1)
109 { 118 {
110 *ttydev = strdup (tty_name); 119 *ttydev = strdup (ttyname (*fd_tty));
111 return pfd; 120 return pfd;
112 } 121 }
113 122
114 return -1; 123 return -1;
115} 124 }
125
116#elif defined(HAVE__GETPTY) 126#elif defined(HAVE__GETPTY)
127
117static int 128 static int
118get_pty (int *fd_tty, char **ttydev) 129 get_pty (int *fd_tty, char **ttydev)
119{ 130 {
120 int pfd; 131 int pfd;
132 char *slave;
121 133
122 *ttydev = _getpty (&pfd, O_RDWR | O_NONBLOCK | O_NOCTTY, 0622, 0); 134 slave = _getpty (&pfd, O_RDWR | O_NOCTTY, 0622, 0);
123 if (*ttydev != NULL)
124 return pfd;
125 135
126 return -1; 136 if (slave != NULL)
127}
128#elif defined(HAVE_DEV_PTC)
129static int
130get_pty (int *fd_tty, char **ttydev)
131{
132 int pfd;
133
134 if ((pfd = open ("/dev/ptc", O_RDWR | O_NOCTTY, 0)) >= 0)
135 { 137 {
136 *ttydev = strdup (ttyname (pfd)); 138 *ttydev = strdup (slave);
137 return pfd; 139 return pfd;
138 } 140 }
139 141
140 return -1; 142 return -1;
141}
142#elif defined(HAVE_DEV_CLONE)
143static int
144get_pty (int *fd_tty, char **ttydev)
145{
146 int pfd;
147
148 if ((pfd = open ("/dev/ptym/clone", O_RDWR | O_NOCTTY, 0)) >= 0)
149 {
150 *ttydev = strdup (ptsname (pfd));
151 return pfd;
152 } 143 }
153 144
154 return -1;
155}
156#else 145#else
146
157/* Based on the code in openssh/openbsd-compat/bsd-openpty.c */ 147 /* Based on the code in openssh/openbsd-compat/bsd-openpty.c */
158static int 148 static int
159get_pty (int *fd_tty, char **ttydev) 149 get_pty (int *fd_tty, char **ttydev)
160{ 150 {
161 int pfd; 151 int pfd;
162 int i; 152 int i;
163 char pty_name[32]; 153 char pty_name[32];
164 char tty_name[32]; 154 char tty_name[32];
165 const char *majors = "pqrstuvwxyzabcde"; 155 const char *majors = "pqrstuvwxyzabcde";
166 const char *minors = "0123456789abcdef"; 156 const char *minors = "0123456789abcdef";
157
167 for (i = 0; i < 256; i++) 158 for (i = 0; i < 256; i++)
168 { 159 {
169 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]);
170 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]);
162
171 if ((pfd = open (pty_name, O_RDWR | O_NOCTTY, 0)) == -1) 163 if ((pfd = open (pty_name, O_RDWR | O_NOCTTY, 0)) == -1)
172 { 164 {
173 snprintf(pty_name, 32, "/dev/ptyp%d", i); 165 snprintf (pty_name, 32, "/dev/ptyp%d", i);
174 snprintf(tty_name, 32, "/dev/ttyp%d", i); 166 snprintf (tty_name, 32, "/dev/ttyp%d", i);
175 if ((pfd = open (pty_name, O_RDWR | O_NOCTTY, 0)) == -1) 167 if ((pfd = open (pty_name, O_RDWR | O_NOCTTY, 0)) == -1)
176 continue; 168 continue;
177 } 169 }
170
178 if (access (tty_name, R_OK | W_OK) == 0) 171 if (access (tty_name, R_OK | W_OK) == 0)
179 { 172 {
180 *ttydev = strdup (tty_name); 173 *ttydev = strdup (tty_name);
181 return pfd; 174 return pfd;
182 } 175 }
183 176
184 close (pfd); 177 close (pfd);
185 } 178 }
186 179
187 return -1; 180 return -1;
188} 181 }
182
189#endif 183#endif
190 184
191/*----------------------------------------------------------------------*/ 185/*----------------------------------------------------------------------*/
192/* 186/*
193 * Returns tty file descriptor, or -1 on failure 187 * Returns tty file descriptor, or -1 on failure
194 */ 188 */
195static int 189static int
196get_tty (char *ttydev) 190get_tty (char *ttydev)
197{ 191{
198 return open (ttydev, O_RDWR | O_NOCTTY, 0); 192 return open (ttydev, O_RDWR | O_NOCTTY, 0);
… …
203 * Make our tty a controlling tty so that /dev/tty points to us 197 * Make our tty a controlling tty so that /dev/tty points to us
204 */ 198 */
205static int 199static int
206control_tty (int fd_tty) 200control_tty (int fd_tty)
207{ 201{
202 int fd;
203
208 setsid (); 204 setsid ();
209 205
210#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)
211 /* 352 /*
212 * Push STREAMS modules: 353 * Push STREAMS modules:
213 * ptem: pseudo-terminal hardware emulation module. 354 * ptem: pseudo-terminal hardware emulation module.
214 * ldterm: standard terminal line discipline. 355 * ldterm: standard terminal line discipline.
215 * ttcompat: V7, 4BSD and XENIX STREAMS compatibility module. 356 * ttcompat: V7, 4BSD and XENIX STREAMS compatibility module.
216 * 357 *
217 * 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
218 * (i.e. the next section between the dashes giving us "tty opened OK")
219 * should make the "ptem" (or "ldterm" depending upon either which OS 359 * should make the "ptem" (or "ldterm" depending upon either which OS
220 * 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
221 * controlling terminal. We must already have close ()d the master side 361 * controlling terminal. We must already have close ()d the master side
222 * 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
223 * documentation is really unclear about whether it is any close () on 363 * documentation is really unclear about whether it is any close () on
224 * 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
225 * 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
226 * through - Geoff Wing 366 * through - Geoff Wing
227 */ 367 */
228# ifdef HAVE_ISASTREAM 368#if defined(HAVE_ISASTREAM) && defined(HAVE_STROPTS_H)
229 if (isastream (fd_tty) == 1) 369 if (isastream (tty) == 1)
230# endif 370# endif
231 { 371 {
232 ioctl (fd_tty, I_PUSH, "ptem"); 372 ioctl (tty, I_PUSH, "ptem");
233 ioctl (fd_tty, I_PUSH, "ldterm"); 373 ioctl (tty, I_PUSH, "ldterm");
234 ioctl (fd_tty, I_PUSH, "ttcompat"); 374 ioctl (tty, I_PUSH, "ttcompat");
235 }
236#endif
237
238 ioctl (fd_tty, TIOCSCTTY, NULL);
239
240 int fd = open ("/dev/tty", O_WRONLY);
241 if (fd < 0)
242 return -1; /* fatal */
243
244 close (fd);
245
246 return 0;
247}
248
249void
250ptytty::close_tty ()
251{
252 if (tty < 0)
253 return;
254
255 close (tty);
256 tty = -1;
257}
258
259bool
260ptytty::make_controlling_tty ()
261{
262 return control_tty (tty) >= 0;
263}
264
265void
266ptytty::set_utf8_mode (bool on)
267{
268#ifdef IUTF8
269 if (pty < 0)
270 return;
271
272 struct termios tio;
273
274 if (tcgetattr (pty, &tio) != -1)
275 { 375 }
276 tcflag_t new_cflag = tio.c_iflag;
277
278 if (on)
279 new_cflag |= IUTF8;
280 else
281 new_cflag &= ~IUTF8;
282
283 if (new_cflag != tio.c_iflag)
284 {
285 tio.c_iflag = new_cflag;
286 tcsetattr (pty, TCSANOW, &tio);
287 }
288 }
289#endif 376#endif
290}
291 377
292static struct ttyconf {
293 gid_t gid;
294 mode_t mode;
295
296 ttyconf ()
297 {
298#ifdef TTY_GID_SUPPORT
299 struct group *gr = getgrnam ("tty");
300
301 if (gr)
302 { /* change group ownership of tty to "tty" */
303 mode = S_IRUSR | S_IWUSR | S_IWGRP;
304 gid = gr->gr_gid;
305 }
306 else
307#endif /* TTY_GID_SUPPORT */
308 {
309 mode = S_IRUSR | S_IWUSR | S_IWGRP | S_IWOTH;
310 gid = 0;
311 }
312 }
313} ttyconf;
314
315ptytty_unix::ptytty_unix ()
316{
317 name = 0;
318#if UTMP_SUPPORT 378#if UTMP_SUPPORT
319 cmd_pid = 0; 379# if defined(HAVE_STRUCT_UTMP) && !defined(HAVE_UTMP_PID)
320#endif 380 int fd_stdin = dup (STDIN_FILENO);
321} 381 dup2 (tty, STDIN_FILENO);
322 382
323ptytty_unix::~ptytty_unix () 383 utmp_pos = ttyslot ();
324{
325#if UTMP_SUPPORT
326 logout ();
327#endif
328 put ();
329}
330 384
331void 385 dup2 (fd_stdin, STDIN_FILENO);
332ptytty_unix::put () 386 close (fd_stdin);
333{
334 chmod (name, RESTORE_TTY_MODE);
335 chown (name, 0, ttyconf.gid);
336
337 close_tty ();
338
339 if (pty >= 0)
340 close (pty);
341
342 free (name);
343
344 pty = tty = -1;
345 name = 0;
346}
347
348bool
349ptytty_unix::get ()
350{
351 /* get master (pty) */
352 if ((pty = get_pty (&tty, &name)) < 0)
353 return false;
354
355 fcntl (pty, F_SETFL, O_NONBLOCK);
356
357 /* get slave (tty) */
358 if (tty < 0)
359 {
360#ifndef NO_SETOWNER_TTYDEV
361 chown (name, getuid (), ttyconf.gid); /* fail silently */
362 chmod (name, ttyconf.mode);
363# ifdef HAVE_REVOKE
364 revoke (name);
365# endif 387# endif
366#endif 388#endif
367 389
368 if ((tty = get_tty (name)) < 0)
369 {
370 put ();
371 return false;
372 }
373 }
374
375 return true; 390 return true;
376} 391}
377 392

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