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Comparing rxvt-unicode/src/ptytty.C (file contents):
Revision 1.12 by root, Fri Aug 13 03:36:57 2004 UTC vs.
Revision 1.45 by root, Tue Jan 17 18:06:14 2006 UTC

… …
2 * File: ptytty.C 2 * File: ptytty.C
3 *----------------------------------------------------------------------* 3 *----------------------------------------------------------------------*
4 * 4 *
5 * All portions of code are copyright by their respective author/s. 5 * All portions of code are copyright by their respective author/s.
6 * Copyright (c) 1999-2001 Geoff Wing <gcw@pobox.com> 6 * Copyright (c) 1999-2001 Geoff Wing <gcw@pobox.com>
7 * Copyright (c) 2004 Marc Lehmann <pcg@goof.com> 7 * Copyright (c) 2004-2006 Marc Lehmann <pcg@goof.com>
8 * 8 *
9 * This program is free software; you can redistribute it and/or modify 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 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 11 * the Free Software Foundation; either version 2 of the License, or
12 * (at your option) any later version. 12 * (at your option) any later version.
… …
20 * along with this program; if not, write to the Free Software 20 * along with this program; if not, write to the Free Software
21 * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. 21 * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
22 *---------------------------------------------------------------------*/ 22 *---------------------------------------------------------------------*/
23 23
24#include "../config.h" /* NECESSARY */ 24#include "../config.h" /* NECESSARY */
25#include "rxvt.h"
25 26
26/*
27 * Try to be self-contained except for the above autoconfig'd defines
28 */
29
30#if 0
31#ifdef HAVE_GETPT
32# define _GNU_SOURCE
33#endif
34#endif
35
36#include <cstdio>
37#ifdef HAVE_STDLIB_H
38# include <cstdlib> 27#include <cstdlib>
39#endif 28#include <cstring>
40#ifdef HAVE_SYS_TYPES_H 29
41# include <sys/types.h> 30#include <sys/types.h>
42#endif 31#include <sys/socket.h>
43#ifdef HAVE_UNISTD_H
44# include <unistd.h> 32#include <unistd.h>
45#endif
46#if defined(HAVE_STRING_H)
47# include <cstring>
48#endif
49#ifdef HAVE_FCNTL_H
50# include <fcntl.h> 33#include <fcntl.h>
51#endif 34
52#ifdef HAVE_SYS_IOCTL_H 35#ifdef HAVE_SYS_IOCTL_H
53# include <sys/ioctl.h> 36# include <sys/ioctl.h>
54#endif 37#endif
55#if defined(PTYS_ARE_PTMX) && defined(HAVE_SYS_STROPTS_H) 38#if defined(PTYS_ARE_PTMX) && defined(HAVE_SYS_STROPTS_H)
56# include <sys/stropts.h> /* for I_PUSH */ 39# include <sys/stropts.h> /* for I_PUSH */
57#endif 40#endif
58#ifdef HAVE_ISASTREAM 41#ifdef HAVE_ISASTREAM
59# include <stropts.h> 42# include <stropts.h>
60#endif 43#endif
61 44#if defined(HAVE_PTY_H)
62#ifdef DEBUG_TTY 45# include <pty.h>
63# define D_TTY(x) fprintf x ; fputc('\n', stderr) ; fflush(stderr) 46#elif defined(HAVE_LIBUTIL_H)
64#else 47# include <libutil.h>
65# define D_TTY(x) 48#elif defined(HAVE_UTIL_H)
49# include <util.h>
66#endif 50#endif
51
52#include <cstdio>
53#include <grp.h>
54
55#include "rxvtutil.h"
56#include "fdpass.h"
57#include "ptytty.h"
58
59/////////////////////////////////////////////////////////////////////////////
67 60
68/* ------------------------------------------------------------------------- * 61/* ------------------------------------------------------------------------- *
69 * GET PSEUDO TELETYPE - MASTER AND SLAVE * 62 * GET PSEUDO TELETYPE - MASTER AND SLAVE *
70 * ------------------------------------------------------------------------- */ 63 * ------------------------------------------------------------------------- */
71/* 64/*
72 * Returns pty file descriptor, or -1 on failure 65 * Returns pty file descriptor, or -1 on failure
73 * If successful, ttydev is set to the name of the slave device. 66 * If successful, ttydev is set to the name of the slave device.
74 * fd_tty _may_ also be set to an open fd to the slave device 67 * fd_tty _may_ also be set to an open fd to the slave device
75 */ 68 */
76/* EXTPROTO */ 69static inline int
77int
78rxvt_get_pty (int *fd_tty, const char **ttydev) 70get_pty_streams (int *fd_tty, char **ttydev)
79{ 71{
72#ifdef NO_SETOWNER_TTYDEV
80 int pfd; 73 int pfd;
81 74
75# if defined(PTYS_ARE_GETPT)
76 pfd = getpt();
77# elif defined(PTYS_ARE_POSIX)
78 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
91 close (pfd);
92 }
93#endif
94
95 return -1;
96}
97
98static inline int
99get_pty_openpty (int *fd_tty, char **ttydev)
100{
82#ifdef PTYS_ARE_OPENPTY 101#ifdef PTYS_ARE_OPENPTY
83 102 int pfd;
103 int res;
84 char tty_name[sizeof "/dev/pts/????\0"]; 104 char tty_name[sizeof "/dev/pts/????\0"];
85 105
86 if (openpty (&pfd, fd_tty, tty_name, NULL, NULL) != -1) 106 res = openpty (&pfd, fd_tty, tty_name, NULL, NULL);
107 if (res != -1)
87 { 108 {
88 *ttydev = strdup (tty_name); 109 *ttydev = strdup (tty_name);
89 return pfd; 110 return pfd;
90 } 111 }
91#endif 112#endif
92 113
114 return -1;
115}
116
117static inline int
118get_pty__getpty (int *fd_tty, char **ttydev)
119{
93#ifdef PTYS_ARE__GETPTY 120#ifdef PTYS_ARE__GETPTY
121 int pfd;
122
94 *ttydev = _getpty (&pfd, O_RDWR | O_NONBLOCK | O_NOCTTY, 0622, 0); 123 *ttydev = _getpty (&pfd, O_RDWR | O_NONBLOCK | O_NOCTTY, 0622, 0);
95 if (*ttydev != NULL) 124 if (*ttydev != NULL)
96 return pfd; 125 return pfd;
97#endif 126#endif
98 127
99#ifdef PTYS_ARE_GETPTY 128 return -1;
129}
100 130
101 char *ptydev; 131static inline int
102 132get_pty_ptc (int *fd_tty, char **ttydev)
103 while ((ptydev = getpty ()) != NULL) 133{
104 if ((pfd = open (ptydev, O_RDWR | O_NOCTTY, 0)) >= 0)
105 {
106 *ttydev = ptydev;
107 return pfd;
108 }
109#endif
110
111#if defined(HAVE_GRANTPT) && defined(HAVE_UNLOCKPT)
112# if defined(PTYS_ARE_GETPT) || defined(PTYS_ARE_PTMX)
113
114 {
115# ifdef PTYS_ARE_GETPT
116 pfd = getpt ();
117# else
118
119 pfd = open ("/dev/ptmx", O_RDWR | O_NOCTTY, 0);
120# endif
121
122 if (pfd >= 0)
123 {
124 if (grantpt (pfd) == 0 /* change slave permissions */
125 && unlockpt (pfd) == 0)
126 { /* slave now unlocked */
127 *ttydev = ptsname (pfd); /* get slave's name */
128 return pfd;
129 }
130 close (pfd);
131 }
132 }
133# endif
134#endif
135
136#ifdef PTYS_ARE_PTC 134#ifdef PTYS_ARE_PTC
135 int pfd;
136
137 if ((pfd = open ("/dev/ptc", O_RDWR | O_NOCTTY, 0)) >= 0) 137 if ((pfd = open ("/dev/ptc", O_RDWR | O_NOCTTY, 0)) >= 0)
138 { 138 {
139 *ttydev = ttyname (pfd); 139 *ttydev = strdup (ttyname (pfd));
140 return pfd; 140 return pfd;
141 } 141 }
142#endif 142#endif
143 143
144 return -1;
145}
146
147static inline int
148get_pty_clone (int *fd_tty, char **ttydev)
149{
144#ifdef PTYS_ARE_CLONE 150#ifdef PTYS_ARE_CLONE
151 int pfd;
152
145 if ((pfd = open ("/dev/ptym/clone", O_RDWR | O_NOCTTY, 0)) >= 0) 153 if ((pfd = open ("/dev/ptym/clone", O_RDWR | O_NOCTTY, 0)) >= 0)
146 { 154 {
147 *ttydev = ptsname (pfd); 155 *ttydev = strdup (ptsname (pfd));
148 return pfd; 156 return pfd;
149 } 157 }
150#endif 158#endif
151 159
160 return -1;
161}
162
163static inline int
164get_pty_numeric (int *fd_tty, char **ttydev)
165{
152#ifdef PTYS_ARE_NUMERIC 166#ifdef PTYS_ARE_NUMERIC
153 { 167 int pfd;
154 int idx; 168 int idx;
155 char *c1, *c2; 169 char *c1, *c2;
156 char pty_name[] = "/dev/ptyp???"; 170 char pty_name[] = "/dev/ptyp???";
157 char tty_name[] = "/dev/ttyp???"; 171 char tty_name[] = "/dev/ttyp???";
158 172
159 c1 = & (pty_name[sizeof (pty_name) - 4]); 173 c1 = &(pty_name[sizeof (pty_name) - 4]);
160 c2 = & (tty_name[sizeof (tty_name) - 4]); 174 c2 = &(tty_name[sizeof (tty_name) - 4]);
175
161 for (idx = 0; idx < 256; idx++) 176 for (idx = 0; idx < 256; idx++)
162 { 177 {
163 sprintf (c1, "%d", idx); 178 sprintf (c1, "%d", idx);
164 sprintf (c2, "%d", idx); 179 sprintf (c2, "%d", idx);
180
165 if (access (tty_name, F_OK) < 0) 181 if (access (tty_name, F_OK) < 0)
166 { 182 {
167 idx = 256; 183 idx = 256;
168 break; 184 break;
169 } 185 }
186
170 if ((pfd = open (pty_name, O_RDWR | O_NOCTTY, 0)) >= 0) 187 if ((pfd = open (pty_name, O_RDWR | O_NOCTTY, 0)) >= 0)
171 { 188 {
172 if (access (tty_name, R_OK | W_OK) == 0) 189 if (access (tty_name, R_OK | W_OK) == 0)
173 { 190 {
174 *ttydev = strdup (tty_name); 191 *ttydev = strdup (tty_name);
175 return pfd; 192 return pfd;
176 } 193 }
194
177 close (pfd); 195 close (pfd);
178 } 196 }
179 } 197 }
180 }
181#endif 198#endif
199
200 return -1;
201}
202
203static inline int
204get_pty_searched (int *fd_tty, char **ttydev)
205{
182#ifdef PTYS_ARE_SEARCHED 206#ifdef PTYS_ARE_SEARCHED
183 {
184 const char *c1, *c2;
185 char pty_name[] = "/dev/pty??";
186 char tty_name[] = "/dev/tty??";
187
188# ifndef PTYCHAR1 207# ifndef PTYCHAR1
189# define PTYCHAR1 "pqrstuvwxyz" 208# define PTYCHAR1 "pqrstuvwxyz"
190# endif 209# endif
191# ifndef PTYCHAR2 210# ifndef PTYCHAR2
192# define PTYCHAR2 "0123456789abcdef" 211# define PTYCHAR2 "0123456789abcdef"
193# endif 212# endif
213 int pfd;
214 const char *c1, *c2;
215 char pty_name[] = "/dev/pty??";
216 char tty_name[] = "/dev/tty??";
194 217
195 for (c1 = PTYCHAR1; *c1; c1++) 218 for (c1 = PTYCHAR1; *c1; c1++)
196 { 219 {
197 pty_name[ (sizeof (pty_name) - 3)] = 220 pty_name[ (sizeof (pty_name) - 3)] =
198 tty_name[ (sizeof (pty_name) - 3)] = *c1; 221 tty_name[ (sizeof (pty_name) - 3)] = *c1;
222
199 for (c2 = PTYCHAR2; *c2; c2++) 223 for (c2 = PTYCHAR2; *c2; c2++)
200 { 224 {
201 pty_name[ (sizeof (pty_name) - 2)] = 225 pty_name[ (sizeof (pty_name) - 2)] =
202 tty_name[ (sizeof (pty_name) - 2)] = *c2; 226 tty_name[ (sizeof (pty_name) - 2)] = *c2;
227
203 if ((pfd = open (pty_name, O_RDWR | O_NOCTTY, 0)) >= 0) 228 if ((pfd = open (pty_name, O_RDWR | O_NOCTTY, 0)) >= 0)
204 { 229 {
205 if (access (tty_name, R_OK | W_OK) == 0) 230 if (access (tty_name, R_OK | W_OK) == 0)
206 { 231 {
207 *ttydev = strdup (tty_name); 232 *ttydev = strdup (tty_name);
208 return pfd; 233 return pfd;
209 } 234 }
235
210 close (pfd); 236 close (pfd);
211 } 237 }
212 } 238 }
213 } 239 }
214 }
215#endif 240#endif
241
242 return -1;
243}
244
245static int
246get_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
216 return -1; 259 return -1;
217} 260}
218 261
219/*----------------------------------------------------------------------*/ 262/*----------------------------------------------------------------------*/
220/* 263/*
221 * Returns tty file descriptor, or -1 on failure 264 * Returns tty file descriptor, or -1 on failure
222 */ 265 */
223/* EXTPROTO */ 266static int
224int
225rxvt_get_tty (const char *ttydev) 267get_tty (char *ttydev)
226{ 268{
227 return open (ttydev, O_RDWR | O_NOCTTY, 0); 269 return open (ttydev, O_RDWR | O_NOCTTY, 0);
228} 270}
229 271
230/*----------------------------------------------------------------------*/ 272/*----------------------------------------------------------------------*/
231/* 273/*
232 * Make our tty a controlling tty so that /dev/tty points to us 274 * Make our tty a controlling tty so that /dev/tty points to us
233 */ 275 */
234/* EXTPROTO */ 276static int
235int 277control_tty (int fd_tty)
236rxvt_control_tty (int fd_tty, const char *ttydev)
237{ 278{
238#ifndef __QNX__
239 int fd;
240
241 D_TTY ((stderr, "rxvt_control_tty (): pid: %d, tty fd: %d, dev: %s", getpid (), fd_tty, ttydev));
242 /* ---------------------------------------- */
243# ifdef HAVE_SETSID
244 setsid (); 279 setsid ();
245# endif
246# if defined(HAVE_SETPGID)
247 setpgid (0, 0);
248# elif defined(HAVE_SETPGRP)
249 setpgrp (0, 0);
250# endif
251 /* ---------------------------------------- */
252# ifdef TIOCNOTTY
253 280
254 fd = open ("/dev/tty", O_RDWR | O_NOCTTY);
255 D_TTY ((stderr, "rxvt_control_tty (): Voiding tty associations: previous=%s", fd < 0 ? "no" : "yes"));
256 if (fd >= 0)
257 {
258 ioctl (fd, TIOCNOTTY, NULL); /* void tty associations */
259 close (fd);
260 }
261# endif
262 /* ---------------------------------------- */
263 fd = open ("/dev/tty", O_RDWR | O_NOCTTY);
264 D_TTY ((stderr, "rxvt_control_tty (): /dev/tty has controlling tty? %s", fd < 0 ? "no (good)" : "yes (bad)"));
265 if (fd >= 0)
266 close (fd); /* ouch: still have controlling tty */
267 /* ---------------------------------------- */
268#if defined(PTYS_ARE_PTMX) && defined(I_PUSH) 281# if defined(PTYS_ARE_PTMX) && defined(I_PUSH)
269 /* 282 /*
270 * Push STREAMS modules: 283 * Push STREAMS modules:
271 * ptem: pseudo-terminal hardware emulation module. 284 * ptem: pseudo-terminal hardware emulation module.
272 * ldterm: standard terminal line discipline. 285 * ldterm: standard terminal line discipline.
273 * ttcompat: V7, 4BSD and XENIX STREAMS compatibility module. 286 * ttcompat: V7, 4BSD and XENIX STREAMS compatibility module.
… …
281 * documentation is really unclear about whether it is any close () on 294 * documentation is really unclear about whether it is any close () on
282 * the master side or the last close () - i.e. a proper STREAMS dismantling 295 * the master side or the last close () - i.e. a proper STREAMS dismantling
283 * close () - on the master side which causes a hang up to be sent 296 * close () - on the master side which causes a hang up to be sent
284 * through - Geoff Wing 297 * through - Geoff Wing
285 */ 298 */
286# ifdef HAVE_ISASTREAM 299# ifdef HAVE_ISASTREAM
287 if (isastream (fd_tty) == 1) 300 if (isastream (fd_tty) == 1)
288# endif 301# endif
289 { 302 {
290 D_TTY ((stderr, "rxvt_control_tty (): Pushing STREAMS modules"));
291 ioctl (fd_tty, I_PUSH, "ptem"); 303 ioctl (fd_tty, I_PUSH, "ptem");
292 ioctl (fd_tty, I_PUSH, "ldterm"); 304 ioctl (fd_tty, I_PUSH, "ldterm");
293 ioctl (fd_tty, I_PUSH, "ttcompat"); 305 ioctl (fd_tty, I_PUSH, "ttcompat");
294 } 306 }
295#endif
296 /* ---------------------------------------- */
297# if defined(TIOCSCTTY)
298 fd = ioctl (fd_tty, TIOCSCTTY, NULL);
299 D_TTY ((stderr, "rxvt_control_tty (): ioctl (..,TIOCSCTTY): %d", fd));
300# elif defined(TIOCSETCTTY)
301 fd = ioctl (fd_tty, TIOCSETCTTY, NULL);
302 D_TTY ((stderr, "rxvt_control_tty (): ioctl (..,TIOCSETCTTY): %d", fd));
303# else
304 fd = open (ttydev, O_RDWR);
305 D_TTY ((stderr, "rxvt_control_tty (): tty open%s", fd < 0 ? " failure" : "ed OK"));
306 if (fd >= 0)
307 close (fd);
308# endif 307# endif
309 /* ---------------------------------------- */ 308
309 ioctl (fd_tty, TIOCSCTTY, NULL);
310
310 fd = open ("/dev/tty", O_WRONLY); 311 int fd = open ("/dev/tty", O_WRONLY);
311 D_TTY ((stderr, "rxvt_control_tty (): do we have controlling tty now: %s", fd < 0 ? "no (fatal)" : "yes (good)"));
312 if (fd < 0) 312 if (fd < 0)
313 return -1; /* fatal */ 313 return -1; /* fatal */
314
314 close (fd); 315 close (fd);
315 /* ---------------------------------------- */
316 D_TTY ((stderr, "rxvt_control_tty (): tcgetpgrp (): %d getpgrp (): %d", tcgetpgrp (fd_tty), getpgrp ()));
317 /* ---------------------------------------- */
318#endif /* ! __QNX__ */
319 316
320 return 0; 317 return 0;
321} 318}
319
320void
321rxvt_ptytty::close_tty ()
322{
323 if (tty < 0)
324 return;
325
326 close (tty);
327 tty = -1;
328}
329
330bool
331rxvt_ptytty::make_controlling_tty ()
332{
333 return control_tty (tty) >= 0;
334}
335
336void
337rxvt_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#ifndef NO_SETOWNER_TTYDEV
366static 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/////////////////////////////////////////////////////////////////////////////
390
391void
392rxvt_ptytty_unix::privileges (rxvt_privaction action)
393{
394 if (!name || !*name)
395 return;
396
397 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 ;
403 else
404# endif
405 {
406 saved = true;
407 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 if (saved)
418 {
419 chmod (name, savestat.st_mode);
420 chown (name, savestat.st_uid, savestat.st_gid);
421 }
422# 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
430rxvt_ptytty_unix::rxvt_ptytty_unix ()
431{
432 pty = tty = -1;
433 name = 0;
434#ifndef NO_SETOWNER_TTYDEV
435 saved = false;
436#endif
437#if UTMP_SUPPORT
438 cmd_pid = 0;
439#endif
440}
441
442rxvt_ptytty_unix::~rxvt_ptytty_unix ()
443{
444#if UTMP_SUPPORT
445 logout ();
446#endif
447 put ();
448}
449
450void
451rxvt_ptytty_unix::put ()
452{
453#ifndef NO_SETOWNER_TTYDEV
454 privileges (RESTORE);
455#endif
456
457 if (pty >= 0) close (pty);
458 close_tty ();
459 free (name);
460
461 pty = tty = -1;
462 name = 0;
463}
464
465bool
466rxvt_ptytty_unix::get ()
467{
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#if PTYTTY_HELPER
492
493static int sock_fd;
494static int pid;
495
496struct 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
507struct 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
517bool
518rxvt_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
539void
540rxvt_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
553rxvt_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
563static
564void 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#if UTMP_SUPPORT
594 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#endif
600 }
601 else if (cmd.type == command::destroy)
602 {
603 rxvt_ptytty **pty = find (ptys.begin (), ptys.end (), cmd.id);
604
605 if (pty)
606 {
607 delete *pty;
608 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
620void 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 setgid (getegid ());
642 setuid (geteuid ());
643
644 // server, pty-helper
645 sock_fd = sv[1];
646
647 for (int fd = 0; fd < 1023; fd++)
648 if (fd != sock_fd && fd != 1)
649 close (fd);
650
651 serve ();
652 _exit (EXIT_SUCCESS);
653 }
654}
655#endif
656
657// a "factory" *g*
658rxvt_ptytty *
659rxvt_new_ptytty ()
660{
661#if PTYTTY_HELPER
662 if (pid > 0)
663 // use helper process
664 return new rxvt_ptytty_proxy;
665 else
666#endif
667 return new rxvt_ptytty_unix;
668}
669
322/*----------------------- end-of-file (C source) -----------------------*/ 670/*----------------------- end-of-file (C source) -----------------------*/
671

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