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Comparing libptytty/src/ptytty.C (file contents):
Revision 1.2 by root, Sat Jan 21 22:01:36 2006 UTC vs.
Revision 1.33 by ayin, Thu Dec 13 14:42:33 2007 UTC

1// This file is part of libptytty. Do not make local modifications.
2// http://software.schmorp.de/pkg/libptytty
3
1/*--------------------------------*-C-*---------------------------------* 4/*----------------------------------------------------------------------*
2 * File: ptytty.C 5 * File: ptytty.C
3 *----------------------------------------------------------------------* 6 *----------------------------------------------------------------------*
4 * 7 *
5 * All portions of code are copyright by their respective author/s. 8 * All portions of code are copyright by their respective author/s.
6 * Copyright (c) 1999-2001 Geoff Wing <gcw@pobox.com> 9 * Copyright (c) 1999-2001 Geoff Wing <gcw@pobox.com>
7 * Copyright (c) 2004-2006 Marc Lehmann <pcg@goof.com> 10 * Copyright (c) 2004-2006 Marc Lehmann <pcg@goof.com>
11 * Copyright (c) 2006 Emanuele Giaquinta <e.giaquinta@glauco.it>
8 * 12 *
9 * This program is free software; you can redistribute it and/or modify 13 * 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 14 * 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 15 * the Free Software Foundation; either version 2 of the License, or
12 * (at your option) any later version. 16 * (at your option) any later version.
… …
19 * You should have received a copy of the GNU General Public License 23 * You should have received a copy of the GNU General Public License
20 * along with this program; if not, write to the Free Software 24 * along with this program; if not, write to the Free Software
21 * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. 25 * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
22 *---------------------------------------------------------------------*/ 26 *---------------------------------------------------------------------*/
23 27
24#include "../config.h" /* NECESSARY */ 28#include "../config.h"
29
30#include "ptytty.h"
25 31
26#include <cstdlib> 32#include <cstdlib>
27#include <cstring> 33#include <cstring>
34#include <csignal>
28 35
29#include <sys/types.h> 36#include <sys/types.h>
30#include <sys/socket.h>
31#include <unistd.h> 37#include <unistd.h>
32#include <fcntl.h> 38#include <fcntl.h>
33 39
34#ifdef HAVE_SYS_IOCTL_H 40#ifdef HAVE_SYS_IOCTL_H
35# include <sys/ioctl.h> 41# include <sys/ioctl.h>
… …
51#include <grp.h> 57#include <grp.h>
52#endif 58#endif
53 59
54#include <cstdio> 60#include <cstdio>
55 61
56#include "rxvtutil.h"
57#include "fdpass.h"
58#include "ptytty.h"
59
60///////////////////////////////////////////////////////////////////////////// 62/////////////////////////////////////////////////////////////////////////////
61 63
62/* ------------------------------------------------------------------------- * 64/* ------------------------------------------------------------------------- *
63 * GET PSEUDO TELETYPE - MASTER AND SLAVE * 65 * GET PSEUDO TELETYPE - MASTER AND SLAVE *
64 * ------------------------------------------------------------------------- */ 66 * ------------------------------------------------------------------------- */
65/* 67/*
66 * Returns pty file descriptor, or -1 on failure 68 * Returns pty file descriptor, or -1 on failure
67 * 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.
68 * 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
69 */ 71 */
70#if defined(UNIX98_PTY) 72#if defined(UNIX98_PTY)
73
71static int 74 static int
72get_pty (int *fd_tty, char **ttydev) 75 get_pty (int *fd_tty, char **ttydev)
73{ 76 {
74 int pfd; 77 int pfd;
75 78
76# if defined(HAVE_GETPT) 79# if defined(HAVE_GETPT)
77 pfd = getpt(); 80 pfd = getpt();
78# elif defined(HAVE_POSIX_OPENPT) 81# elif defined(HAVE_POSIX_OPENPT)
79 pfd = posix_openpt (O_RDWR); 82 pfd = posix_openpt (O_RDWR);
80# else 83# else
81 pfd = open (CLONE_DEVICE, O_RDWR | O_NOCTTY, 0); 84 pfd = open (CLONE_DEVICE, O_RDWR | O_NOCTTY, 0);
82# endif 85# endif
86
83 if (pfd >= 0) 87 if (pfd >= 0)
84 { 88 {
85 if (grantpt (pfd) == 0 /* change slave permissions */ 89 if (grantpt (pfd) == 0 /* change slave permissions */
86 && unlockpt (pfd) == 0) 90 && unlockpt (pfd) == 0)
91 {
87 { /* slave now unlocked */ 92 /* slave now unlocked */
88 *ttydev = strdup (ptsname (pfd)); /* get slave's name */ 93 *ttydev = strdup (ptsname (pfd)); /* get slave's name */
89 return pfd; 94 return pfd;
90 } 95 }
91 96
92 close (pfd); 97 close (pfd);
93 } 98 }
94 99
95 return -1; 100 return -1;
96} 101 }
102
97#elif defined(HAVE_OPENPTY) 103#elif defined(HAVE_OPENPTY)
104
98static int 105 static int
99get_pty (int *fd_tty, char **ttydev) 106 get_pty (int *fd_tty, char **ttydev)
100{ 107 {
101 int pfd; 108 int pfd;
102 int res; 109 int res;
103 char tty_name[32]; 110
104
105 res = openpty (&pfd, fd_tty, tty_name, NULL, NULL); 111 res = openpty (&pfd, fd_tty, NULL, NULL, NULL);
112
106 if (res != -1) 113 if (res != -1)
107 { 114 {
108 *ttydev = strdup (tty_name); 115 *ttydev = strdup (ttyname (*fd_tty));
109 return pfd; 116 return pfd;
110 } 117 }
111 118
112 return -1; 119 return -1;
113} 120 }
121
114#elif defined(HAVE__GETPTY) 122#elif defined(HAVE__GETPTY)
123
115static int 124 static int
116get_pty (int *fd_tty, char **ttydev) 125 get_pty (int *fd_tty, char **ttydev)
117{ 126 {
118 int pfd; 127 int pfd;
128 char *slave;
119 129
120 *ttydev = _getpty (&pfd, O_RDWR | O_NONBLOCK | O_NOCTTY, 0622, 0); 130 slave = _getpty (&pfd, O_RDWR | O_NONBLOCK | O_NOCTTY, 0622, 0);
121 if (*ttydev != NULL) 131
132 if (slave != NULL)
133 {
134 *ttydev = strdup (slave);
122 return pfd; 135 return pfd;
136 }
123 137
124 return -1; 138 return -1;
125} 139 }
140
126#elif defined(HAVE_DEV_PTC) 141#elif defined(HAVE_DEV_PTC)
142
127static int 143 static int
128get_pty (int *fd_tty, char **ttydev) 144 get_pty (int *fd_tty, char **ttydev)
129{ 145 {
130 int pfd; 146 int pfd;
131 147
132 if ((pfd = open ("/dev/ptc", O_RDWR | O_NOCTTY, 0)) >= 0) 148 if ((pfd = open ("/dev/ptc", O_RDWR | O_NOCTTY, 0)) >= 0)
133 { 149 {
134 *ttydev = strdup (ttyname (pfd)); 150 *ttydev = strdup (ttyname (pfd));
135 return pfd; 151 return pfd;
136 } 152 }
137 153
138 return -1; 154 return -1;
139} 155 }
156
140#elif defined(HAVE_DEV_CLONE) 157#elif defined(HAVE_DEV_CLONE)
158
141static int 159 static int
142get_pty (int *fd_tty, char **ttydev) 160 get_pty (int *fd_tty, char **ttydev)
143{ 161 {
144 int pfd; 162 int pfd;
145 163
146 if ((pfd = open ("/dev/ptym/clone", O_RDWR | O_NOCTTY, 0)) >= 0) 164 if ((pfd = open ("/dev/ptym/clone", O_RDWR | O_NOCTTY, 0)) >= 0)
147 { 165 {
148 *ttydev = strdup (ptsname (pfd)); 166 *ttydev = strdup (ptsname (pfd));
149 return pfd; 167 return pfd;
150 } 168 }
151 169
152 return -1; 170 return -1;
153} 171 }
172
154#else 173#else
174
155/* Based on the code in openssh/openbsd-compat/bsd-openpty.c */ 175 /* Based on the code in openssh/openbsd-compat/bsd-openpty.c */
156static int 176 static int
157get_pty (int *fd_tty, char **ttydev) 177 get_pty (int *fd_tty, char **ttydev)
158{ 178 {
159 int pfd; 179 int pfd;
160 int i; 180 int i;
161 char pty_name[32]; 181 char pty_name[32];
162 char tty_name[32]; 182 char tty_name[32];
163 const char *majors = "pqrstuvwxyzabcde"; 183 const char *majors = "pqrstuvwxyzabcde";
164 const char *minors = "0123456789abcdef"; 184 const char *minors = "0123456789abcdef";
185
165 for (i = 0; i < 256; i++) 186 for (i = 0; i < 256; i++)
166 { 187 {
167 snprintf(pty_name, 32, "/dev/pty%c%c", majors[i / 16], minors[i % 16]); 188 snprintf(pty_name, 32, "/dev/pty%c%c", majors[i / 16], minors[i % 16]);
168 snprintf(tty_name, 32, "/dev/tty%c%c", majors[i / 16], minors[i % 16]); 189 snprintf(tty_name, 32, "/dev/tty%c%c", majors[i / 16], minors[i % 16]);
190
169 if ((pfd = open (pty_name, O_RDWR | O_NOCTTY, 0)) == -1) 191 if ((pfd = open (pty_name, O_RDWR | O_NOCTTY, 0)) == -1)
170 { 192 {
171 snprintf(pty_name, 32, "/dev/ptyp%d", i); 193 snprintf(pty_name, 32, "/dev/ptyp%d", i);
172 snprintf(tty_name, 32, "/dev/ttyp%d", i); 194 snprintf(tty_name, 32, "/dev/ttyp%d", i);
173 if ((pfd = open (pty_name, O_RDWR | O_NOCTTY, 0)) == -1) 195 if ((pfd = open (pty_name, O_RDWR | O_NOCTTY, 0)) == -1)
174 continue; 196 continue;
175 } 197 }
198
176 if (access (tty_name, R_OK | W_OK) == 0) 199 if (access (tty_name, R_OK | W_OK) == 0)
177 { 200 {
178 *ttydev = strdup (tty_name); 201 *ttydev = strdup (tty_name);
179 return pfd; 202 return pfd;
180 } 203 }
181 204
182 close (pfd); 205 close (pfd);
183 } 206 }
184} 207
208 return -1;
209 }
210
185#endif 211#endif
186 212
187/*----------------------------------------------------------------------*/ 213/*----------------------------------------------------------------------*/
188/* 214/*
189 * Returns tty file descriptor, or -1 on failure 215 * Returns tty file descriptor, or -1 on failure
190 */ 216 */
191static int 217static int
192get_tty (char *ttydev) 218get_tty (char *ttydev)
193{ 219{
194 return open (ttydev, O_RDWR | O_NOCTTY, 0); 220 return open (ttydev, O_RDWR | O_NOCTTY, 0);
… …
199 * Make our tty a controlling tty so that /dev/tty points to us 225 * Make our tty a controlling tty so that /dev/tty points to us
200 */ 226 */
201static int 227static int
202control_tty (int fd_tty) 228control_tty (int fd_tty)
203{ 229{
230 int fd;
231
204 setsid (); 232 setsid ();
205 233
206#if defined(HAVE_DEV_PTMX) && defined(I_PUSH) 234#if defined(HAVE_DEV_PTMX) && defined(I_PUSH)
207 /* 235 /*
208 * Push STREAMS modules: 236 * Push STREAMS modules:
… …
229 ioctl (fd_tty, I_PUSH, "ldterm"); 257 ioctl (fd_tty, I_PUSH, "ldterm");
230 ioctl (fd_tty, I_PUSH, "ttcompat"); 258 ioctl (fd_tty, I_PUSH, "ttcompat");
231 } 259 }
232#endif 260#endif
233 261
262#ifdef TIOCSCTTY
234 ioctl (fd_tty, TIOCSCTTY, NULL); 263 ioctl (fd_tty, TIOCSCTTY, NULL);
264#else
265 fd = open (ttyname (fd_tty), O_RDWR);
266 if (fd >= 0)
267 close (fd);
268#endif
235 269
236 int fd = open ("/dev/tty", O_WRONLY); 270 fd = open ("/dev/tty", O_WRONLY);
237 if (fd < 0) 271 if (fd < 0)
238 return -1; /* fatal */ 272 return -1; /* fatal */
239 273
240 close (fd); 274 close (fd);
241 275
242 return 0; 276 return 0;
243} 277}
244 278
245void 279void
246rxvt_ptytty::close_tty () 280ptytty::close_tty ()
247{ 281{
248 if (tty < 0) 282 if (tty < 0)
249 return; 283 return;
250 284
251 close (tty); 285 close (tty);
252 tty = -1; 286 tty = -1;
253} 287}
254 288
255bool 289bool
256rxvt_ptytty::make_controlling_tty () 290ptytty::make_controlling_tty ()
257{ 291{
258 return control_tty (tty) >= 0; 292 return control_tty (tty) >= 0;
259} 293}
260 294
261void 295void
262rxvt_ptytty::set_utf8_mode (bool on) 296ptytty::set_utf8_mode (bool on)
263{ 297{
264#ifdef IUTF8 298#ifdef IUTF8
265 if (pty < 0) 299 if (pty < 0)
266 return; 300 return;
267 301
… …
293 { 327 {
294#ifdef TTY_GID_SUPPORT 328#ifdef TTY_GID_SUPPORT
295 struct group *gr = getgrnam ("tty"); 329 struct group *gr = getgrnam ("tty");
296 330
297 if (gr) 331 if (gr)
332 {
298 { /* change group ownership of tty to "tty" */ 333 /* change group ownership of tty to "tty" */
299 mode = S_IRUSR | S_IWUSR | S_IWGRP; 334 mode = S_IRUSR | S_IWUSR | S_IWGRP;
300 gid = gr->gr_gid; 335 gid = gr->gr_gid;
301 } 336 }
302 else 337 else
303#endif /* TTY_GID_SUPPORT */ 338#endif /* TTY_GID_SUPPORT */
304 { 339 {
305 mode = S_IRUSR | S_IWUSR | S_IWGRP | S_IWOTH; 340 mode = S_IRUSR | S_IWUSR | S_IWGRP | S_IWOTH;
306 gid = 0; 341 gid = 0;
307 } 342 }
308 } 343 }
309} ttyconf; 344} ttyconf;
310 345
311rxvt_ptytty_unix::rxvt_ptytty_unix () 346ptytty_unix::ptytty_unix ()
312{ 347{
313 name = 0; 348 name = 0;
314#if UTMP_SUPPORT 349#if UTMP_SUPPORT
315 cmd_pid = 0; 350 cmd_pid = 0;
316#endif 351#endif
317} 352}
318 353
319rxvt_ptytty_unix::~rxvt_ptytty_unix () 354ptytty_unix::~ptytty_unix ()
320{ 355{
321#if UTMP_SUPPORT 356#if UTMP_SUPPORT
322 logout (); 357 logout ();
323#endif 358#endif
324 put (); 359 put ();
325} 360}
326 361
327void 362void
328rxvt_ptytty_unix::put () 363ptytty_unix::put ()
329{ 364{
365 if (name)
366 {
330 chmod (name, RESTORE_TTY_MODE); 367 chmod (name, RESTORE_TTY_MODE);
331 chown (name, 0, ttyconf.gid); 368 chown (name, 0, ttyconf.gid);
369 }
332 370
333 close_tty (); 371 close_tty ();
334 372
335 if (pty >= 0) 373 if (pty >= 0)
336 close (pty); 374 close (pty);
… …
340 pty = tty = -1; 378 pty = tty = -1;
341 name = 0; 379 name = 0;
342} 380}
343 381
344bool 382bool
345rxvt_ptytty_unix::get () 383ptytty_unix::get ()
346{ 384{
347 /* get master (pty) */ 385 /* get master (pty) */
348 if ((pty = get_pty (&tty, &name)) < 0) 386 if ((pty = get_pty (&tty, &name)) < 0)
349 return false; 387 return false;
350 388
… …
369 } 407 }
370 408
371 return true; 409 return true;
372} 410}
373 411
374#if PTYTTY_HELPER
375
376static int sock_fd;
377static int pid;
378
379struct command
380{
381 enum { get, login, destroy } type;
382
383 rxvt_ptytty *id;
384
385 bool login_shell;
386 int cmd_pid;
387 char hostname[512]; // arbitrary, but should be plenty
388};
389
390struct rxvt_ptytty_proxy : zero_initialized, rxvt_ptytty
391{
392 rxvt_ptytty *id;
393
394 ~rxvt_ptytty_proxy ();
395
396 bool get ();
397 void login (int cmd_pid, bool login_shell, const char *hostname);
398};
399
400bool
401rxvt_ptytty_proxy::get ()
402{
403 command cmd;
404
405 cmd.type = command::get;
406
407 write (sock_fd, &cmd, sizeof (cmd));
408
409 if (read (sock_fd, &id, sizeof (id)) != sizeof (id))
410 rxvt_fatal ("protocol error while creating pty using helper process, aborting.\n");
411
412 if (!id)
413 return false;
414
415 if ((pty = rxvt_recv_fd (sock_fd)) < 0
416 || (tty = rxvt_recv_fd (sock_fd)) < 0)
417 rxvt_fatal ("protocol error while reading pty/tty fds from helper process, aborting.\n");
418
419 return true;
420}
421
422void
423rxvt_ptytty_proxy::login (int cmd_pid, bool login_shell, const char *hostname)
424{
425 command cmd;
426
427 cmd.type = command::login;
428 cmd.id = id;
429 cmd.cmd_pid = cmd_pid;
430 cmd.login_shell = login_shell;
431 strncpy (cmd.hostname, hostname, sizeof (cmd.hostname));
432
433 write (sock_fd, &cmd, sizeof (cmd));
434}
435
436rxvt_ptytty_proxy::~rxvt_ptytty_proxy ()
437{
438 command cmd;
439
440 cmd.type = command::destroy;
441 cmd.id = id;
442
443 write (sock_fd, &cmd, sizeof (cmd));
444}
445
446static
447void serve ()
448{
449 command cmd;
450 vector<rxvt_ptytty *> ptys;
451
452 while (read (sock_fd, &cmd, sizeof (command)) == sizeof (command))
453 {
454 if (cmd.type == command::get)
455 {
456 // -> id ptyfd ttyfd
457 cmd.id = new rxvt_ptytty_unix;
458
459 if (cmd.id->get ())
460 {
461 write (sock_fd, &cmd.id, sizeof (cmd.id));
462 ptys.push_back (cmd.id);
463
464 rxvt_send_fd (sock_fd, cmd.id->pty);
465 rxvt_send_fd (sock_fd, cmd.id->tty);
466 }
467 else
468 {
469 delete cmd.id;
470 cmd.id = 0;
471 write (sock_fd, &cmd.id, sizeof (cmd.id));
472 }
473 }
474 else if (cmd.type == command::login)
475 {
476#if UTMP_SUPPORT
477 if (find (ptys.begin (), ptys.end (), cmd.id))
478 {
479 cmd.hostname[sizeof (cmd.hostname) - 1] = 0;
480 cmd.id->login (cmd.cmd_pid, cmd.login_shell, cmd.hostname);
481 }
482#endif
483 }
484 else if (cmd.type == command::destroy)
485 {
486 rxvt_ptytty **pty = find (ptys.begin (), ptys.end (), cmd.id);
487
488 if (pty)
489 {
490 delete *pty;
491 ptys.erase (pty);
492 }
493 }
494 else
495 break;
496 }
497
498 // destroy all ptys
499 for (rxvt_ptytty **i = ptys.end (); i-- > ptys.begin (); )
500 delete *i;
501}
502
503void rxvt_ptytty_server ()
504{
505 int sv[2];
506
507 if (socketpair (AF_UNIX, SOCK_STREAM, 0, sv))
508 rxvt_fatal ("could not create socket to communicate with pty/sessiondb helper, aborting.\n");
509
510 pid = fork ();
511
512 if (pid < 0)
513 rxvt_fatal ("could not create pty/sessiondb helper process, aborting.\n");
514
515 if (pid)
516 {
517 // client, urxvt
518 sock_fd = sv[0];
519 close (sv[1]);
520 fcntl (sock_fd, F_SETFD, FD_CLOEXEC);
521 }
522 else
523 {
524 // server, pty-helper
525 sock_fd = sv[1];
526
527 for (int fd = 0; fd < 1023; fd++)
528 if (fd != sock_fd)
529 close (fd);
530
531 serve ();
532 _exit (EXIT_SUCCESS);
533 }
534}
535
536#endif
537
538// a "factory" *g*
539rxvt_ptytty *
540rxvt_new_ptytty ()
541{
542#if PTYTTY_HELPER
543 if (pid > 0)
544 // use helper process
545 return new rxvt_ptytty_proxy;
546 else
547#endif
548 return new rxvt_ptytty_unix;
549}
550
551/*----------------------- end-of-file (C source) -----------------------*/
552

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