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Comparing rxvt-unicode/src/ptytty.C (file contents):
Revision 1.10 by pcg, Fri Apr 2 20:41:01 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 <cstdio>
36#ifdef HAVE_STDLIB_H
37# include <cstdlib> 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 <cstring>
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#ifdef HAVE_ISASTREAM 41#ifdef HAVE_ISASTREAM
58# include <stropts.h> 42# include <stropts.h>
59#endif 43#endif
60 44#if defined(HAVE_PTY_H)
61#ifdef DEBUG_TTY 45# include <pty.h>
62# define D_TTY(x) fprintf x ; fputc('\n', stderr) ; fflush(stderr) 46#elif defined(HAVE_LIBUTIL_H)
63#else 47# include <libutil.h>
64# define D_TTY(x) 48#elif defined(HAVE_UTIL_H)
49# include <util.h>
65#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/////////////////////////////////////////////////////////////////////////////
66 60
67/* ------------------------------------------------------------------------- * 61/* ------------------------------------------------------------------------- *
68 * GET PSEUDO TELETYPE - MASTER AND SLAVE * 62 * GET PSEUDO TELETYPE - MASTER AND SLAVE *
69 * ------------------------------------------------------------------------- */ 63 * ------------------------------------------------------------------------- */
70/* 64/*
71 * Returns pty file descriptor, or -1 on failure 65 * Returns pty file descriptor, or -1 on failure
72 * 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.
73 * 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
74 */ 68 */
75/* EXTPROTO */ 69static inline int
76int
77rxvt_get_pty (int *fd_tty, const char **ttydev) 70get_pty_streams (int *fd_tty, char **ttydev)
78{ 71{
72#ifdef NO_SETOWNER_TTYDEV
79 int pfd; 73 int pfd;
80 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{
81#ifdef PTYS_ARE_OPENPTY 101#ifdef PTYS_ARE_OPENPTY
82 102 int pfd;
103 int res;
83 char tty_name[sizeof "/dev/pts/????\0"]; 104 char tty_name[sizeof "/dev/pts/????\0"];
84 105
85 if (openpty (&pfd, fd_tty, tty_name, NULL, NULL) != -1) 106 res = openpty (&pfd, fd_tty, tty_name, NULL, NULL);
107 if (res != -1)
86 { 108 {
87 *ttydev = strdup (tty_name); 109 *ttydev = strdup (tty_name);
88 return pfd; 110 return pfd;
89 } 111 }
90#endif 112#endif
113 return -1;
114}
91 115
116static inline int
117get_pty__getpty (int *fd_tty, char **ttydev)
118{
92#ifdef PTYS_ARE__GETPTY 119#ifdef PTYS_ARE__GETPTY
120 int pfd;
121
93 *ttydev = _getpty (&pfd, O_RDWR | O_NONBLOCK | O_NOCTTY, 0622, 0); 122 *ttydev = _getpty (&pfd, O_RDWR | O_NONBLOCK | O_NOCTTY, 0622, 0);
94 if (*ttydev != NULL) 123 if (*ttydev != NULL)
95 return pfd; 124 return pfd;
96#endif 125#endif
126 return -1;
127}
97 128
98#ifdef PTYS_ARE_GETPTY 129static inline int
99 130get_pty_ptc (int *fd_tty, char **ttydev)
100 char *ptydev; 131{
101
102 while ((ptydev = getpty ()) != NULL)
103 if ((pfd = open (ptydev, O_RDWR | O_NOCTTY, 0)) >= 0)
104 {
105 *ttydev = ptydev;
106 return pfd;
107 }
108#endif
109
110#if defined(HAVE_GRANTPT) && defined(HAVE_UNLOCKPT)
111# if defined(PTYS_ARE_GETPT) || defined(PTYS_ARE_PTMX)
112
113 {
114# ifdef PTYS_ARE_GETPT
115 pfd = getpt ();
116# else
117
118 pfd = open ("/dev/ptmx", O_RDWR | O_NOCTTY, 0);
119# endif
120
121 if (pfd >= 0)
122 {
123 if (grantpt (pfd) == 0 /* change slave permissions */
124 && unlockpt (pfd) == 0)
125 { /* slave now unlocked */
126 *ttydev = ptsname (pfd); /* get slave's name */
127 return pfd;
128 }
129 close (pfd);
130 }
131 }
132# endif
133#endif
134
135#ifdef PTYS_ARE_PTC 132#ifdef PTYS_ARE_PTC
133 int pfd;
134
136 if ((pfd = open ("/dev/ptc", O_RDWR | O_NOCTTY, 0)) >= 0) 135 if ((pfd = open ("/dev/ptc", O_RDWR | O_NOCTTY, 0)) >= 0)
137 { 136 {
138 *ttydev = ttyname (pfd); 137 *ttydev = strdup (ttyname (pfd));
139 return pfd; 138 return pfd;
140 } 139 }
141#endif 140#endif
141 return -1;
142}
142 143
144static inline int
145get_pty_clone (int *fd_tty, char **ttydev)
146{
143#ifdef PTYS_ARE_CLONE 147#ifdef PTYS_ARE_CLONE
148 int pfd;
149
144 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)
145 { 151 {
146 *ttydev = ptsname (pfd); 152 *ttydev = strdup (ptsname (pfd));
147 return pfd; 153 return pfd;
148 } 154 }
149#endif 155#endif
156 return -1;
157}
150 158
159static inline int
160get_pty_numeric (int *fd_tty, char **ttydev)
161{
151#ifdef PTYS_ARE_NUMERIC 162#ifdef PTYS_ARE_NUMERIC
152 { 163 int pfd;
153 int idx; 164 int idx;
154 char *c1, *c2; 165 char *c1, *c2;
155 char pty_name[] = "/dev/ptyp???"; 166 char pty_name[] = "/dev/ptyp???";
156 char tty_name[] = "/dev/ttyp???"; 167 char tty_name[] = "/dev/ttyp???";
157 168
158 c1 = & (pty_name[sizeof (pty_name) - 4]); 169 c1 = &(pty_name[sizeof (pty_name) - 4]);
159 c2 = & (tty_name[sizeof (tty_name) - 4]); 170 c2 = &(tty_name[sizeof (tty_name) - 4]);
160 for (idx = 0; idx < 256; idx++) 171 for (idx = 0; idx < 256; idx++)
161 { 172 {
162 sprintf (c1, "%d", idx); 173 sprintf (c1, "%d", idx);
163 sprintf (c2, "%d", idx); 174 sprintf (c2, "%d", idx);
164 if (access (tty_name, F_OK) < 0) 175 if (access (tty_name, F_OK) < 0)
165 { 176 {
166 idx = 256; 177 idx = 256;
167 break; 178 break;
168 } 179 }
180
169 if ((pfd = open (pty_name, O_RDWR | O_NOCTTY, 0)) >= 0) 181 if ((pfd = open (pty_name, O_RDWR | O_NOCTTY, 0)) >= 0)
170 { 182 {
171 if (access (tty_name, R_OK | W_OK) == 0) 183 if (access (tty_name, R_OK | W_OK) == 0)
172 { 184 {
173 *ttydev = strdup (tty_name); 185 *ttydev = strdup (tty_name);
174 return pfd; 186 return pfd;
175 } 187 }
188
176 close (pfd); 189 close (pfd);
177 } 190 }
178 } 191 }
179 }
180#endif 192#endif
193 return -1;
194}
195
196static inline int
197get_pty_searched (int *fd_tty, char **ttydev)
198{
181#ifdef PTYS_ARE_SEARCHED 199#ifdef PTYS_ARE_SEARCHED
182 {
183 const char *c1, *c2;
184 char pty_name[] = "/dev/pty??";
185 char tty_name[] = "/dev/tty??";
186
187# ifndef PTYCHAR1 200# ifndef PTYCHAR1
188# define PTYCHAR1 "pqrstuvwxyz" 201# define PTYCHAR1 "pqrstuvwxyz"
189# endif 202# endif
190# ifndef PTYCHAR2 203# ifndef PTYCHAR2
191# define PTYCHAR2 "0123456789abcdef" 204# define PTYCHAR2 "0123456789abcdef"
192# endif 205# endif
206 int pfd;
207 const char *c1, *c2;
208 char pty_name[] = "/dev/pty??";
209 char tty_name[] = "/dev/tty??";
193 210
194 for (c1 = PTYCHAR1; *c1; c1++) 211 for (c1 = PTYCHAR1; *c1; c1++)
195 { 212 {
196 pty_name[ (sizeof (pty_name) - 3)] = 213 pty_name[ (sizeof (pty_name) - 3)] =
197 tty_name[ (sizeof (pty_name) - 3)] = *c1; 214 tty_name[ (sizeof (pty_name) - 3)] = *c1;
… …
204 if (access (tty_name, R_OK | W_OK) == 0) 221 if (access (tty_name, R_OK | W_OK) == 0)
205 { 222 {
206 *ttydev = strdup (tty_name); 223 *ttydev = strdup (tty_name);
207 return pfd; 224 return pfd;
208 } 225 }
226
209 close (pfd); 227 close (pfd);
210 } 228 }
211 } 229 }
212 } 230 }
213 }
214#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;
215 return -1; 248 return -1;
216} 249}
217 250
218/*----------------------------------------------------------------------*/ 251/*----------------------------------------------------------------------*/
219/* 252/*
220 * Returns tty file descriptor, or -1 on failure 253 * Returns tty file descriptor, or -1 on failure
221 */ 254 */
222/* EXTPROTO */ 255static int
223int
224rxvt_get_tty (const char *ttydev) 256get_tty (char *ttydev)
225{ 257{
226 return open (ttydev, O_RDWR | O_NOCTTY, 0); 258 return open (ttydev, O_RDWR | O_NOCTTY, 0);
227} 259}
228 260
229/*----------------------------------------------------------------------*/ 261/*----------------------------------------------------------------------*/
230/* 262/*
231 * 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
232 */ 264 */
233/* EXTPROTO */ 265static int
234int 266control_tty (int fd_tty)
235rxvt_control_tty (int fd_tty, const char *ttydev)
236{ 267{
237#ifndef __QNX__
238 int fd; 268 int fd;
239 269
240 D_TTY ((stderr, "rxvt_control_tty (): pid: %d, tty fd: %d, dev: %s", getpid (), fd_tty, ttydev));
241 /* ---------------------------------------- */ 270 /* ---------------------------------------- */
242# ifdef HAVE_SETSID
243 setsid (); 271 setsid ();
244# endif 272
245# if defined(HAVE_SETPGID)
246 setpgid (0, 0);
247# elif defined(HAVE_SETPGRP)
248 setpgrp (0, 0);
249# endif
250 /* ---------------------------------------- */ 273 /* ---------------------------------------- */
251# ifdef TIOCNOTTY
252
253 fd = open ("/dev/tty", O_RDWR | O_NOCTTY);
254 D_TTY ((stderr, "rxvt_control_tty (): Voiding tty associations: previous=%s", fd < 0 ? "no" : "yes"));
255 if (fd >= 0)
256 {
257 ioctl (fd, TIOCNOTTY, NULL); /* void tty associations */
258 close (fd);
259 }
260# endif
261 /* ---------------------------------------- */
262 fd = open ("/dev/tty", O_RDWR | O_NOCTTY);
263 D_TTY ((stderr, "rxvt_control_tty (): /dev/tty has controlling tty? %s", fd < 0 ? "no (good)" : "yes (bad)"));
264 if (fd >= 0)
265 close (fd); /* ouch: still have controlling tty */
266 /* ---------------------------------------- */
267#if defined(PTYS_ARE_PTMX) && defined(I_PUSH) 274# if defined(PTYS_ARE_PTMX) && defined(I_PUSH)
268 /* 275 /*
269 * Push STREAMS modules: 276 * Push STREAMS modules:
270 * ptem: pseudo-terminal hardware emulation module. 277 * ptem: pseudo-terminal hardware emulation module.
271 * ldterm: standard terminal line discipline. 278 * ldterm: standard terminal line discipline.
272 * ttcompat: V7, 4BSD and XENIX STREAMS compatibility module. 279 * ttcompat: V7, 4BSD and XENIX STREAMS compatibility module.
… …
280 * documentation is really unclear about whether it is any close () on 287 * documentation is really unclear about whether it is any close () on
281 * 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
282 * 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
283 * through - Geoff Wing 290 * through - Geoff Wing
284 */ 291 */
285# ifdef HAVE_ISASTREAM 292# ifdef HAVE_ISASTREAM
286 if (isastream (fd_tty) == 1) 293 if (isastream (fd_tty) == 1)
287# endif 294# endif
288 { 295 {
289 D_TTY ((stderr, "rxvt_control_tty (): Pushing STREAMS modules"));
290 ioctl (fd_tty, I_PUSH, "ptem"); 296 ioctl (fd_tty, I_PUSH, "ptem");
291 ioctl (fd_tty, I_PUSH, "ldterm"); 297 ioctl (fd_tty, I_PUSH, "ldterm");
292 ioctl (fd_tty, I_PUSH, "ttcompat"); 298 ioctl (fd_tty, I_PUSH, "ttcompat");
293 } 299 }
294#endif 300# endif
295 /* ---------------------------------------- */ 301 /* ---------------------------------------- */
296# if defined(TIOCSCTTY)
297 fd = ioctl (fd_tty, TIOCSCTTY, NULL); 302 fd = ioctl (fd_tty, TIOCSCTTY, NULL);
298 D_TTY ((stderr, "rxvt_control_tty (): ioctl (..,TIOCSCTTY): %d", fd));
299# elif defined(TIOCSETCTTY)
300 fd = ioctl (fd_tty, TIOCSETCTTY, NULL);
301 D_TTY ((stderr, "rxvt_control_tty (): ioctl (..,TIOCSETCTTY): %d", fd));
302# else
303 fd = open (ttydev, O_RDWR);
304 D_TTY ((stderr, "rxvt_control_tty (): tty open%s", fd < 0 ? " failure" : "ed OK"));
305 if (fd >= 0)
306 close (fd);
307# endif
308 /* ---------------------------------------- */ 303 /* ---------------------------------------- */
309 fd = open ("/dev/tty", O_WRONLY); 304 fd = open ("/dev/tty", O_WRONLY);
310 D_TTY ((stderr, "rxvt_control_tty (): do we have controlling tty now: %s", fd < 0 ? "no (fatal)" : "yes (good)"));
311 if (fd < 0) 305 if (fd < 0)
312 return -1; /* fatal */ 306 return -1; /* fatal */
313 close (fd); 307 close (fd);
314 /* ---------------------------------------- */ 308 /* ---------------------------------------- */
315 D_TTY ((stderr, "rxvt_control_tty (): tcgetpgrp (): %d getpgrp (): %d", tcgetpgrp (fd_tty), getpgrp ()));
316 /* ---------------------------------------- */
317#endif /* ! __QNX__ */
318 309
319 return 0; 310 return 0;
320} 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
321/*----------------------- end-of-file (C source) -----------------------*/ 664/*----------------------- end-of-file (C source) -----------------------*/
665

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