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Comparing rxvt-unicode/src/ptytty.C (file contents):
Revision 1.7 by pcg, Mon Mar 1 01:06:46 2004 UTC vs.
Revision 1.44 by ayin, Tue Jan 17 17:59:31 2006 UTC

1/*--------------------------------*-C-*---------------------------------* 1/*--------------------------------*-C-*---------------------------------*
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) 2004-2006 Marc Lehmann <pcg@goof.com>
7 * 8 *
8 * 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
9 * 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
10 * the Free Software Foundation; either version 2 of the License, or 11 * the Free Software Foundation; either version 2 of the License, or
11 * (at your option) any later version. 12 * (at your option) any later version.
… …
19 * along with this program; if not, write to the Free Software 20 * along with this program; if not, write to the Free Software
20 * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. 21 * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
21 *---------------------------------------------------------------------*/ 22 *---------------------------------------------------------------------*/
22 23
23#include "../config.h" /* NECESSARY */ 24#include "../config.h" /* NECESSARY */
25#include "rxvt.h"
24 26
25/*
26 * Try to be self-contained except for the above autoconfig'd defines
27 */
28
29#if 0
30#ifdef HAVE_GETPT
31# define _GNU_SOURCE
32#endif
33#endif
34
35#include <stdio.h>
36#ifdef HAVE_STDLIB_H
37# include <stdlib.h> 27#include <cstdlib>
38#endif 28#include <cstring>
39#ifdef HAVE_SYS_TYPES_H 29
40# include <sys/types.h> 30#include <sys/types.h>
41#endif 31#include <sys/socket.h>
42#ifdef HAVE_UNISTD_H
43# include <unistd.h> 32#include <unistd.h>
44#endif
45#if defined(HAVE_STRING_H)
46# include <string.h>
47#endif
48#ifdef HAVE_FCNTL_H
49# include <fcntl.h> 33#include <fcntl.h>
50#endif 34
51#ifdef HAVE_SYS_IOCTL_H 35#ifdef HAVE_SYS_IOCTL_H
52# include <sys/ioctl.h> 36# include <sys/ioctl.h>
53#endif 37#endif
54#if defined(PTYS_ARE_PTMX) && !defined(__CYGWIN32__) 38#if defined(PTYS_ARE_PTMX) && defined(HAVE_SYS_STROPTS_H)
55# include <sys/stropts.h> /* for I_PUSH */ 39# include <sys/stropts.h> /* for I_PUSH */
56#endif 40#endif
57 41#ifdef HAVE_ISASTREAM
58#ifdef DEBUG_TTY 42# include <stropts.h>
59# define D_TTY(x) fprintf x ; fputc('\n', stderr) ; fflush(stderr)
60#else
61# define D_TTY(x)
62#endif 43#endif
44#if defined(HAVE_PTY_H)
45# include <pty.h>
46#elif defined(HAVE_LIBUTIL_H)
47# include <libutil.h>
48#elif defined(HAVE_UTIL_H)
49# include <util.h>
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/////////////////////////////////////////////////////////////////////////////
63 60
64/* ------------------------------------------------------------------------- * 61/* ------------------------------------------------------------------------- *
65 * GET PSEUDO TELETYPE - MASTER AND SLAVE * 62 * GET PSEUDO TELETYPE - MASTER AND SLAVE *
66 * ------------------------------------------------------------------------- */ 63 * ------------------------------------------------------------------------- */
67/* 64/*
68 * Returns pty file descriptor, or -1 on failure 65 * Returns pty file descriptor, or -1 on failure
69 * 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.
70 * 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
71 */ 68 */
72/* EXTPROTO */ 69static inline int
73int
74rxvt_get_pty (int *fd_tty, const char **ttydev) 70get_pty_streams (int *fd_tty, char **ttydev)
75{ 71{
72#ifdef NO_SETOWNER_TTYDEV
76 int pfd; 73 int pfd;
77 74
75# ifdef PTYS_ARE_GETPT
76 pfd = getpt();
77# else
78# ifdef PTYS_ARE_POSIX
79 pfd = posix_openpt (O_RDWR);
80# else
81 pfd = open ("/dev/ptmx", O_RDWR | O_NOCTTY, 0);
82# endif
83# endif
84 if (pfd >= 0)
85 {
86 if (grantpt (pfd) == 0 /* change slave permissions */
87 && unlockpt (pfd) == 0)
88 { /* slave now unlocked */
89 *ttydev = strdup (ptsname (pfd)); /* get slave's name */
90 return pfd;
91 }
92 close (pfd);
93 }
94#endif
95 return -1;
96}
97
98static inline int
99get_pty_openpty (int *fd_tty, char **ttydev)
100{
78#ifdef PTYS_ARE_OPENPTY 101#ifdef PTYS_ARE_OPENPTY
79 102 int pfd;
103 int res;
80 char tty_name[sizeof "/dev/pts/????\0"]; 104 char tty_name[sizeof "/dev/pts/????\0"];
81 105
82 if (openpty (&pfd, fd_tty, tty_name, NULL, NULL) != -1) 106 res = openpty (&pfd, fd_tty, tty_name, NULL, NULL);
107 if (res != -1)
83 { 108 {
84 *ttydev = strdup (tty_name); 109 *ttydev = strdup (tty_name);
85 return pfd; 110 return pfd;
86 } 111 }
87#endif 112#endif
113 return -1;
114}
88 115
116static inline int
117get_pty__getpty (int *fd_tty, char **ttydev)
118{
89#ifdef PTYS_ARE__GETPTY 119#ifdef PTYS_ARE__GETPTY
120 int pfd;
121
90 *ttydev = _getpty (&pfd, O_RDWR | O_NONBLOCK | O_NOCTTY, 0622, 0); 122 *ttydev = _getpty (&pfd, O_RDWR | O_NONBLOCK | O_NOCTTY, 0622, 0);
91 if (*ttydev != NULL) 123 if (*ttydev != NULL)
92 return pfd; 124 return pfd;
93#endif 125#endif
126 return -1;
127}
94 128
95#ifdef PTYS_ARE_GETPTY 129static inline int
96 130get_pty_ptc (int *fd_tty, char **ttydev)
97 char *ptydev; 131{
98
99 while ((ptydev = getpty ()) != NULL)
100 if ((pfd = open (ptydev, O_RDWR | O_NOCTTY, 0)) >= 0)
101 {
102 *ttydev = ptydev;
103 return pfd;
104 }
105#endif
106
107#if defined(HAVE_GRANTPT) && defined(HAVE_UNLOCKPT)
108# if defined(PTYS_ARE_GETPT) || defined(PTYS_ARE_PTMX)
109
110 {
111# ifdef PTYS_ARE_GETPT
112 pfd = getpt ();
113# else
114
115 pfd = open ("/dev/ptmx", O_RDWR | O_NOCTTY, 0);
116# endif
117
118 if (pfd >= 0)
119 {
120 if (grantpt (pfd) == 0 /* change slave permissions */
121 && unlockpt (pfd) == 0)
122 { /* slave now unlocked */
123 *ttydev = ptsname (pfd); /* get slave's name */
124 return pfd;
125 }
126 close (pfd);
127 }
128 }
129# endif
130#endif
131
132#ifdef PTYS_ARE_PTC 132#ifdef PTYS_ARE_PTC
133 int pfd;
134
133 if ((pfd = open ("/dev/ptc", O_RDWR | O_NOCTTY, 0)) >= 0) 135 if ((pfd = open ("/dev/ptc", O_RDWR | O_NOCTTY, 0)) >= 0)
134 { 136 {
135 *ttydev = ttyname (pfd); 137 *ttydev = strdup (ttyname (pfd));
136 return pfd; 138 return pfd;
137 } 139 }
138#endif 140#endif
141 return -1;
142}
139 143
144static inline int
145get_pty_clone (int *fd_tty, char **ttydev)
146{
140#ifdef PTYS_ARE_CLONE 147#ifdef PTYS_ARE_CLONE
148 int pfd;
149
141 if ((pfd = open ("/dev/ptym/clone", O_RDWR | O_NOCTTY, 0)) >= 0) 150 if ((pfd = open ("/dev/ptym/clone", O_RDWR | O_NOCTTY, 0)) >= 0)
142 { 151 {
143 *ttydev = ptsname (pfd); 152 *ttydev = strdup (ptsname (pfd));
144 return pfd; 153 return pfd;
145 } 154 }
146#endif 155#endif
156 return -1;
157}
147 158
159static inline int
160get_pty_numeric (int *fd_tty, char **ttydev)
161{
148#ifdef PTYS_ARE_NUMERIC 162#ifdef PTYS_ARE_NUMERIC
149 { 163 int pfd;
150 int idx; 164 int idx;
151 char *c1, *c2; 165 char *c1, *c2;
152 char pty_name[] = "/dev/ptyp???"; 166 char pty_name[] = "/dev/ptyp???";
153 char tty_name[] = "/dev/ttyp???"; 167 char tty_name[] = "/dev/ttyp???";
154 168
155 c1 = & (pty_name[sizeof (pty_name) - 4]); 169 c1 = &(pty_name[sizeof (pty_name) - 4]);
156 c2 = & (tty_name[sizeof (tty_name) - 4]); 170 c2 = &(tty_name[sizeof (tty_name) - 4]);
157 for (idx = 0; idx < 256; idx++) 171 for (idx = 0; idx < 256; idx++)
158 { 172 {
159 sprintf (c1, "%d", idx); 173 sprintf (c1, "%d", idx);
160 sprintf (c2, "%d", idx); 174 sprintf (c2, "%d", idx);
161 if (access (tty_name, F_OK) < 0) 175 if (access (tty_name, F_OK) < 0)
162 { 176 {
163 idx = 256; 177 idx = 256;
164 break; 178 break;
165 } 179 }
180
166 if ((pfd = open (pty_name, O_RDWR | O_NOCTTY, 0)) >= 0) 181 if ((pfd = open (pty_name, O_RDWR | O_NOCTTY, 0)) >= 0)
167 { 182 {
168 if (access (tty_name, R_OK | W_OK) == 0) 183 if (access (tty_name, R_OK | W_OK) == 0)
169 { 184 {
170 *ttydev = strdup (tty_name); 185 *ttydev = strdup (tty_name);
171 return pfd; 186 return pfd;
172 } 187 }
188
173 close (pfd); 189 close (pfd);
174 } 190 }
175 } 191 }
176 }
177#endif 192#endif
193 return -1;
194}
195
196static inline int
197get_pty_searched (int *fd_tty, char **ttydev)
198{
178#ifdef PTYS_ARE_SEARCHED 199#ifdef PTYS_ARE_SEARCHED
179 {
180 const char *c1, *c2;
181 char pty_name[] = "/dev/pty??";
182 char tty_name[] = "/dev/tty??";
183
184# ifndef PTYCHAR1 200# ifndef PTYCHAR1
185# define PTYCHAR1 "pqrstuvwxyz" 201# define PTYCHAR1 "pqrstuvwxyz"
186# endif 202# endif
187# ifndef PTYCHAR2 203# ifndef PTYCHAR2
188# define PTYCHAR2 "0123456789abcdef" 204# define PTYCHAR2 "0123456789abcdef"
189# endif 205# endif
206 int pfd;
207 const char *c1, *c2;
208 char pty_name[] = "/dev/pty??";
209 char tty_name[] = "/dev/tty??";
190 210
191 for (c1 = PTYCHAR1; *c1; c1++) 211 for (c1 = PTYCHAR1; *c1; c1++)
192 { 212 {
193 pty_name[ (sizeof (pty_name) - 3)] = 213 pty_name[ (sizeof (pty_name) - 3)] =
194 tty_name[ (sizeof (pty_name) - 3)] = *c1; 214 tty_name[ (sizeof (pty_name) - 3)] = *c1;
… …
201 if (access (tty_name, R_OK | W_OK) == 0) 221 if (access (tty_name, R_OK | W_OK) == 0)
202 { 222 {
203 *ttydev = strdup (tty_name); 223 *ttydev = strdup (tty_name);
204 return pfd; 224 return pfd;
205 } 225 }
226
206 close (pfd); 227 close (pfd);
207 } 228 }
208 } 229 }
209 } 230 }
210 }
211#endif 231#endif
232 return -1;
233}
234
235static int
236get_pty (int *fd_tty, char **ttydev)
237{
238 int pfd;
239
240 if ((pfd = get_pty_streams (fd_tty, ttydev)) != -1
241 || (pfd = get_pty_openpty (fd_tty, ttydev)) != -1
242 || (pfd = get_pty__getpty (fd_tty, ttydev)) != -1
243 || (pfd = get_pty_ptc (fd_tty, ttydev)) != -1
244 || (pfd = get_pty_clone (fd_tty, ttydev)) != -1
245 || (pfd = get_pty_numeric (fd_tty, ttydev)) != -1
246 || (pfd = get_pty_searched (fd_tty, ttydev)) != -1)
247 return pfd;
212 return -1; 248 return -1;
213} 249}
214 250
215/*----------------------------------------------------------------------*/ 251/*----------------------------------------------------------------------*/
216/* 252/*
217 * Returns tty file descriptor, or -1 on failure 253 * Returns tty file descriptor, or -1 on failure
218 */ 254 */
219/* EXTPROTO */ 255static int
220int
221rxvt_get_tty (const char *ttydev) 256get_tty (char *ttydev)
222{ 257{
223 return open (ttydev, O_RDWR | O_NOCTTY, 0); 258 return open (ttydev, O_RDWR | O_NOCTTY, 0);
224} 259}
225 260
226/*----------------------------------------------------------------------*/ 261/*----------------------------------------------------------------------*/
227/* 262/*
228 * Make our tty a controlling tty so that /dev/tty points to us 263 * Make our tty a controlling tty so that /dev/tty points to us
229 */ 264 */
230/* EXTPROTO */ 265static int
231int 266control_tty (int fd_tty)
232rxvt_control_tty (int fd_tty, const char *ttydev)
233{ 267{
234#ifndef __QNX__
235 int fd; 268 int fd;
236 269
237 D_TTY ((stderr, "rxvt_control_tty (): pid: %d, tty fd: %d, dev: %s", getpid (), fd_tty, ttydev));
238 /* ---------------------------------------- */ 270 /* ---------------------------------------- */
239# ifdef HAVE_SETSID
240 setsid (); 271 setsid ();
241# endif 272
242# if defined(HAVE_SETPGID)
243 setpgid (0, 0);
244# elif defined(HAVE_SETPGRP)
245 setpgrp (0, 0);
246# endif
247 /* ---------------------------------------- */ 273 /* ---------------------------------------- */
248# ifdef TIOCNOTTY
249
250 fd = open ("/dev/tty", O_RDWR | O_NOCTTY);
251 D_TTY ((stderr, "rxvt_control_tty (): Voiding tty associations: previous=%s", fd < 0 ? "no" : "yes"));
252 if (fd >= 0)
253 {
254 ioctl (fd, TIOCNOTTY, NULL); /* void tty associations */
255 close (fd);
256 }
257# endif
258 /* ---------------------------------------- */
259 fd = open ("/dev/tty", O_RDWR | O_NOCTTY);
260 D_TTY ((stderr, "rxvt_control_tty (): /dev/tty has controlling tty? %s", fd < 0 ? "no (good)" : "yes (bad)"));
261 if (fd >= 0)
262 close (fd); /* ouch: still have controlling tty */
263 /* ---------------------------------------- */
264#if defined(PTYS_ARE_PTMX) && defined(I_PUSH) 274# if defined(PTYS_ARE_PTMX) && defined(I_PUSH)
265 /* 275 /*
266 * Push STREAMS modules: 276 * Push STREAMS modules:
267 * ptem: pseudo-terminal hardware emulation module. 277 * ptem: pseudo-terminal hardware emulation module.
268 * ldterm: standard terminal line discipline. 278 * ldterm: standard terminal line discipline.
269 * ttcompat: V7, 4BSD and XENIX STREAMS compatibility module. 279 * ttcompat: V7, 4BSD and XENIX STREAMS compatibility module.
… …
277 * documentation is really unclear about whether it is any close () on 287 * documentation is really unclear about whether it is any close () on
278 * the master side or the last close () - i.e. a proper STREAMS dismantling 288 * the master side or the last close () - i.e. a proper STREAMS dismantling
279 * close () - on the master side which causes a hang up to be sent 289 * close () - on the master side which causes a hang up to be sent
280 * through - Geoff Wing 290 * through - Geoff Wing
281 */ 291 */
282# ifdef HAVE_ISASTREAM 292# ifdef HAVE_ISASTREAM
283 if (isastream (fd_tty) == 1) 293 if (isastream (fd_tty) == 1)
284# endif 294# endif
285 { 295 {
286 D_TTY ((stderr, "rxvt_control_tty (): Pushing STREAMS modules"));
287 ioctl (fd_tty, I_PUSH, "ptem"); 296 ioctl (fd_tty, I_PUSH, "ptem");
288 ioctl (fd_tty, I_PUSH, "ldterm"); 297 ioctl (fd_tty, I_PUSH, "ldterm");
289 ioctl (fd_tty, I_PUSH, "ttcompat"); 298 ioctl (fd_tty, I_PUSH, "ttcompat");
290 } 299 }
291#endif 300# endif
292 /* ---------------------------------------- */ 301 /* ---------------------------------------- */
293# if defined(TIOCSCTTY)
294 fd = ioctl (fd_tty, TIOCSCTTY, NULL); 302 fd = ioctl (fd_tty, TIOCSCTTY, NULL);
295 D_TTY ((stderr, "rxvt_control_tty (): ioctl (..,TIOCSCTTY): %d", fd));
296# elif defined(TIOCSETCTTY)
297 fd = ioctl (fd_tty, TIOCSETCTTY, NULL);
298 D_TTY ((stderr, "rxvt_control_tty (): ioctl (..,TIOCSETCTTY): %d", fd));
299# else
300 fd = open (ttydev, O_RDWR);
301 D_TTY ((stderr, "rxvt_control_tty (): tty open%s", fd < 0 ? " failure" : "ed OK"));
302 if (fd >= 0)
303 close (fd);
304# endif
305 /* ---------------------------------------- */ 303 /* ---------------------------------------- */
306 fd = open ("/dev/tty", O_WRONLY); 304 fd = open ("/dev/tty", O_WRONLY);
307 D_TTY ((stderr, "rxvt_control_tty (): do we have controlling tty now: %s", fd < 0 ? "no (fatal)" : "yes (good)"));
308 if (fd < 0) 305 if (fd < 0)
309 return -1; /* fatal */ 306 return -1; /* fatal */
310 close (fd); 307 close (fd);
311 /* ---------------------------------------- */ 308 /* ---------------------------------------- */
312 D_TTY ((stderr, "rxvt_control_tty (): tcgetpgrp (): %d getpgrp (): %d", tcgetpgrp (fd_tty), getpgrp ()));
313 /* ---------------------------------------- */
314#endif /* ! __QNX__ */
315 309
316 return 0; 310 return 0;
317} 311}
312
313void
314rxvt_ptytty::close_tty ()
315{
316 if (tty < 0)
317 return;
318
319 close (tty);
320 tty = -1;
321}
322
323bool
324rxvt_ptytty::make_controlling_tty ()
325{
326 return control_tty (tty) >= 0;
327}
328
329void
330rxvt_ptytty::set_utf8_mode (bool on)
331{
332#ifdef IUTF8
333 if (pty < 0)
334 return;
335
336 struct termios tio;
337
338 if (tcgetattr (pty, &tio) != -1)
339 {
340 tcflag_t new_cflag = tio.c_iflag;
341
342 if (on)
343 new_cflag |= IUTF8;
344 else
345 new_cflag &= ~IUTF8;
346
347 if (new_cflag != tio.c_iflag)
348 {
349 tio.c_iflag = new_cflag;
350 tcsetattr (pty, TCSANOW, &tio);
351 }
352 }
353#endif
354}
355
356/////////////////////////////////////////////////////////////////////////////
357
358#ifndef NO_SETOWNER_TTYDEV
359static struct ttyconf {
360 gid_t gid;
361 mode_t mode;
362
363 ttyconf ()
364 {
365#ifdef TTY_GID_SUPPORT
366 struct group *gr = getgrnam ("tty");
367
368 if (gr)
369 { /* change group ownership of tty to "tty" */
370 mode = S_IRUSR | S_IWUSR | S_IWGRP;
371 gid = gr->gr_gid;
372 }
373 else
374#endif /* TTY_GID_SUPPORT */
375 {
376 mode = S_IRUSR | S_IWUSR | S_IWGRP | S_IWOTH;
377 gid = getgid ();
378 }
379 }
380} ttyconf;
381
382/////////////////////////////////////////////////////////////////////////////
383
384void
385rxvt_ptytty_unix::privileges (rxvt_privaction action)
386{
387 if (!name || !*name)
388 return;
389
390 if (action == SAVE)
391 {
392# ifndef RESET_TTY_TO_COMMON_DEFAULTS
393 /* store original tty status for restoration rxvt_clean_exit () -- rgg 04/12/95 */
394 if (lstat (name, &savestat) < 0) /* you lose out */
395 ;
396 else
397# endif
398 {
399 saved = true;
400 chown (name, getuid (), ttyconf.gid); /* fail silently */
401 chmod (name, ttyconf.mode);
402# ifdef HAVE_REVOKE
403 revoke (name);
404# endif
405 }
406 }
407 else
408 { /* action == RESTORE */
409# ifndef RESET_TTY_TO_COMMON_DEFAULTS
410 if (saved)
411 {
412 chmod (name, savestat.st_mode);
413 chown (name, savestat.st_uid, savestat.st_gid);
414 }
415# else
416 chmod (name, (S_IRUSR | S_IWUSR | S_IRGRP | S_IWGRP | S_IROTH | S_IWOTH));
417 chown (name, 0, 0);
418# endif
419
420 }
421}
422#endif
423
424rxvt_ptytty_unix::rxvt_ptytty_unix ()
425{
426 pty = tty = -1;
427 name = 0;
428#ifndef NO_SETOWNER_TTYDEV
429 saved = false;
430#endif
431#if UTMP_SUPPORT
432 cmd_pid = 0;
433#endif
434}
435
436rxvt_ptytty_unix::~rxvt_ptytty_unix ()
437{
438#if UTMP_SUPPORT
439 logout ();
440#endif
441 put ();
442}
443
444void
445rxvt_ptytty_unix::put ()
446{
447#ifndef NO_SETOWNER_TTYDEV
448 privileges (RESTORE);
449#endif
450
451 if (pty >= 0) close (pty);
452 close_tty ();
453 free (name);
454
455 pty = tty = -1;
456 name = 0;
457}
458
459bool
460rxvt_ptytty_unix::get ()
461{
462 /* get master (pty) */
463 if ((pty = get_pty (&tty, &name)) < 0)
464 return false;
465
466 fcntl (pty, F_SETFL, O_NONBLOCK);
467
468 /* get slave (tty) */
469 if (tty < 0)
470 {
471#ifndef NO_SETOWNER_TTYDEV
472 privileges (SAVE);
473#endif
474
475 if ((tty = get_tty (name)) < 0)
476 {
477 put ();
478 return false;
479 }
480 }
481
482 return true;
483}
484
485#if PTYTTY_HELPER
486
487static int sock_fd;
488static int pid;
489
490struct command
491{
492 enum { get, login, destroy } type;
493
494 rxvt_ptytty *id;
495
496 bool login_shell;
497 int cmd_pid;
498 char hostname[512]; // arbitrary, but should be plenty
499};
500
501struct rxvt_ptytty_proxy : zero_initialized, rxvt_ptytty
502{
503 rxvt_ptytty *id;
504
505 ~rxvt_ptytty_proxy ();
506
507 bool get ();
508 void login (int cmd_pid, bool login_shell, const char *hostname);
509};
510
511bool
512rxvt_ptytty_proxy::get ()
513{
514 command cmd;
515
516 cmd.type = command::get;
517
518 write (sock_fd, &cmd, sizeof (cmd));
519
520 if (read (sock_fd, &id, sizeof (id)) != sizeof (id))
521 rxvt_fatal ("protocol error while creating pty using helper process, aborting.\n");
522
523 if (!id)
524 return false;
525
526 if ((pty = rxvt_recv_fd (sock_fd)) < 0
527 || (tty = rxvt_recv_fd (sock_fd)) < 0)
528 rxvt_fatal ("protocol error while reading pty/tty fds from helper process, aborting.\n");
529
530 return true;
531}
532
533void
534rxvt_ptytty_proxy::login (int cmd_pid, bool login_shell, const char *hostname)
535{
536 command cmd;
537
538 cmd.type = command::login;
539 cmd.id = id;
540 cmd.cmd_pid = cmd_pid;
541 cmd.login_shell = login_shell;
542 strncpy (cmd.hostname, hostname, sizeof (cmd.hostname));
543
544 write (sock_fd, &cmd, sizeof (cmd));
545}
546
547rxvt_ptytty_proxy::~rxvt_ptytty_proxy ()
548{
549 command cmd;
550
551 cmd.type = command::destroy;
552 cmd.id = id;
553
554 write (sock_fd, &cmd, sizeof (cmd));
555}
556
557static
558void serve ()
559{
560 command cmd;
561 vector<rxvt_ptytty *> ptys;
562
563 while (read (sock_fd, &cmd, sizeof (command)) == sizeof (command))
564 {
565 if (cmd.type == command::get)
566 {
567 // -> id ptyfd ttyfd
568 cmd.id = new rxvt_ptytty_unix;
569
570 if (cmd.id->get ())
571 {
572 write (sock_fd, &cmd.id, sizeof (cmd.id));
573 ptys.push_back (cmd.id);
574
575 rxvt_send_fd (sock_fd, cmd.id->pty);
576 rxvt_send_fd (sock_fd, cmd.id->tty);
577 }
578 else
579 {
580 delete cmd.id;
581 cmd.id = 0;
582 write (sock_fd, &cmd.id, sizeof (cmd.id));
583 }
584 }
585 else if (cmd.type == command::login)
586 {
587#if UTMP_SUPPORT
588 if (find (ptys.begin (), ptys.end (), cmd.id))
589 {
590 cmd.hostname[sizeof (cmd.hostname) - 1] = 0;
591 cmd.id->login (cmd.cmd_pid, cmd.login_shell, cmd.hostname);
592 }
593#endif
594 }
595 else if (cmd.type == command::destroy)
596 {
597 rxvt_ptytty **pty = find (ptys.begin (), ptys.end (), cmd.id);
598
599 if (pty)
600 {
601 delete *pty;
602 ptys.erase (pty);
603 }
604 }
605 else
606 break;
607 }
608
609 // destroy all ptys
610 for (rxvt_ptytty **i = ptys.end (); i-- > ptys.begin (); )
611 delete *i;
612}
613
614void rxvt_ptytty_server ()
615{
616 int sv[2];
617
618 if (socketpair (AF_UNIX, SOCK_STREAM, 0, sv))
619 rxvt_fatal ("could not create socket to communicate with pty/sessiondb helper, aborting.\n");
620
621 pid = fork ();
622
623 if (pid < 0)
624 rxvt_fatal ("could not create pty/sessiondb helper process, aborting.\n");
625
626 if (pid)
627 {
628 // client, urxvt
629 sock_fd = sv[0];
630 close (sv[1]);
631 fcntl (sock_fd, F_SETFD, FD_CLOEXEC);
632 }
633 else
634 {
635 setgid (getegid ());
636 setuid (geteuid ());
637
638 // server, pty-helper
639 sock_fd = sv[1];
640
641 for (int fd = 0; fd < 1023; fd++)
642 if (fd != sock_fd && fd != 1)
643 close (fd);
644
645 serve ();
646 _exit (EXIT_SUCCESS);
647 }
648}
649#endif
650
651// a "factory" *g*
652rxvt_ptytty *
653rxvt_new_ptytty ()
654{
655#if PTYTTY_HELPER
656 if (pid > 0)
657 // use helper process
658 return new rxvt_ptytty_proxy;
659 else
660#endif
661 return new rxvt_ptytty_unix;
662}
663
318/*----------------------- end-of-file (C source) -----------------------*/ 664/*----------------------- end-of-file (C source) -----------------------*/
665

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