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Comparing libptytty/src/ptytty.C (file contents):
Revision 1.9 by root, Sun Jan 22 03:49:41 2006 UTC vs.
Revision 1.33 by ayin, Thu Dec 13 14:42:33 2007 UTC

… …
6 *----------------------------------------------------------------------* 6 *----------------------------------------------------------------------*
7 * 7 *
8 * All portions of code are copyright by their respective author/s. 8 * All portions of code are copyright by their respective author/s.
9 * Copyright (c) 1999-2001 Geoff Wing <gcw@pobox.com> 9 * Copyright (c) 1999-2001 Geoff Wing <gcw@pobox.com>
10 * 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>
11 * 12 *
12 * 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
13 * 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
14 * the Free Software Foundation; either version 2 of the License, or 15 * the Free Software Foundation; either version 2 of the License, or
15 * (at your option) any later version. 16 * (at your option) any later version.
… …
28 29
29#include "ptytty.h" 30#include "ptytty.h"
30 31
31#include <cstdlib> 32#include <cstdlib>
32#include <cstring> 33#include <cstring>
34#include <csignal>
33 35
34#include <sys/types.h> 36#include <sys/types.h>
35#include <sys/socket.h>
36#include <unistd.h> 37#include <unistd.h>
37#include <fcntl.h> 38#include <fcntl.h>
38 39
39#ifdef HAVE_SYS_IOCTL_H 40#ifdef HAVE_SYS_IOCTL_H
40# include <sys/ioctl.h> 41# include <sys/ioctl.h>
… …
62 63
63/* ------------------------------------------------------------------------- * 64/* ------------------------------------------------------------------------- *
64 * GET PSEUDO TELETYPE - MASTER AND SLAVE * 65 * GET PSEUDO TELETYPE - MASTER AND SLAVE *
65 * ------------------------------------------------------------------------- */ 66 * ------------------------------------------------------------------------- */
66/* 67/*
67 * Returns pty file descriptor, or -1 on failure 68 * Returns pty file descriptor, or -1 on failure
68 * 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.
69 * 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
70 */ 71 */
71#if defined(UNIX98_PTY) 72#if defined(UNIX98_PTY)
73
72static int 74 static int
73get_pty (int *fd_tty, char **ttydev) 75 get_pty (int *fd_tty, char **ttydev)
74{ 76 {
75 int pfd; 77 int pfd;
76 78
77# if defined(HAVE_GETPT) 79# if defined(HAVE_GETPT)
78 pfd = getpt(); 80 pfd = getpt();
79# elif defined(HAVE_POSIX_OPENPT) 81# elif defined(HAVE_POSIX_OPENPT)
80 pfd = posix_openpt (O_RDWR); 82 pfd = posix_openpt (O_RDWR);
81# else 83# else
82 pfd = open (CLONE_DEVICE, O_RDWR | O_NOCTTY, 0); 84 pfd = open (CLONE_DEVICE, O_RDWR | O_NOCTTY, 0);
83# endif 85# endif
86
84 if (pfd >= 0) 87 if (pfd >= 0)
85 { 88 {
86 if (grantpt (pfd) == 0 /* change slave permissions */ 89 if (grantpt (pfd) == 0 /* change slave permissions */
87 && unlockpt (pfd) == 0) 90 && unlockpt (pfd) == 0)
91 {
88 { /* slave now unlocked */ 92 /* slave now unlocked */
89 *ttydev = strdup (ptsname (pfd)); /* get slave's name */ 93 *ttydev = strdup (ptsname (pfd)); /* get slave's name */
90 return pfd; 94 return pfd;
91 } 95 }
92 96
93 close (pfd); 97 close (pfd);
94 } 98 }
95 99
96 return -1; 100 return -1;
97} 101 }
102
98#elif defined(HAVE_OPENPTY) 103#elif defined(HAVE_OPENPTY)
104
99static int 105 static int
100get_pty (int *fd_tty, char **ttydev) 106 get_pty (int *fd_tty, char **ttydev)
101{ 107 {
102 int pfd; 108 int pfd;
103 int res; 109 int res;
104 char tty_name[32]; 110
105
106 res = openpty (&pfd, fd_tty, tty_name, NULL, NULL); 111 res = openpty (&pfd, fd_tty, NULL, NULL, NULL);
112
107 if (res != -1) 113 if (res != -1)
108 { 114 {
109 *ttydev = strdup (tty_name); 115 *ttydev = strdup (ttyname (*fd_tty));
110 return pfd; 116 return pfd;
111 } 117 }
112 118
113 return -1; 119 return -1;
114} 120 }
121
115#elif defined(HAVE__GETPTY) 122#elif defined(HAVE__GETPTY)
123
116static int 124 static int
117get_pty (int *fd_tty, char **ttydev) 125 get_pty (int *fd_tty, char **ttydev)
118{ 126 {
119 int pfd; 127 int pfd;
128 char *slave;
120 129
121 *ttydev = _getpty (&pfd, O_RDWR | O_NONBLOCK | O_NOCTTY, 0622, 0); 130 slave = _getpty (&pfd, O_RDWR | O_NONBLOCK | O_NOCTTY, 0622, 0);
122 if (*ttydev != NULL) 131
132 if (slave != NULL)
133 {
134 *ttydev = strdup (slave);
123 return pfd; 135 return pfd;
136 }
124 137
125 return -1; 138 return -1;
126} 139 }
140
127#elif defined(HAVE_DEV_PTC) 141#elif defined(HAVE_DEV_PTC)
142
128static int 143 static int
129get_pty (int *fd_tty, char **ttydev) 144 get_pty (int *fd_tty, char **ttydev)
130{ 145 {
131 int pfd; 146 int pfd;
132 147
133 if ((pfd = open ("/dev/ptc", O_RDWR | O_NOCTTY, 0)) >= 0) 148 if ((pfd = open ("/dev/ptc", O_RDWR | O_NOCTTY, 0)) >= 0)
134 { 149 {
135 *ttydev = strdup (ttyname (pfd)); 150 *ttydev = strdup (ttyname (pfd));
136 return pfd; 151 return pfd;
137 } 152 }
138 153
139 return -1; 154 return -1;
140} 155 }
156
141#elif defined(HAVE_DEV_CLONE) 157#elif defined(HAVE_DEV_CLONE)
158
142static int 159 static int
143get_pty (int *fd_tty, char **ttydev) 160 get_pty (int *fd_tty, char **ttydev)
144{ 161 {
145 int pfd; 162 int pfd;
146 163
147 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)
148 { 165 {
149 *ttydev = strdup (ptsname (pfd)); 166 *ttydev = strdup (ptsname (pfd));
150 return pfd; 167 return pfd;
151 } 168 }
152 169
153 return -1; 170 return -1;
154} 171 }
172
155#else 173#else
174
156/* Based on the code in openssh/openbsd-compat/bsd-openpty.c */ 175 /* Based on the code in openssh/openbsd-compat/bsd-openpty.c */
157static int 176 static int
158get_pty (int *fd_tty, char **ttydev) 177 get_pty (int *fd_tty, char **ttydev)
159{ 178 {
160 int pfd; 179 int pfd;
161 int i; 180 int i;
162 char pty_name[32]; 181 char pty_name[32];
163 char tty_name[32]; 182 char tty_name[32];
164 const char *majors = "pqrstuvwxyzabcde"; 183 const char *majors = "pqrstuvwxyzabcde";
165 const char *minors = "0123456789abcdef"; 184 const char *minors = "0123456789abcdef";
185
166 for (i = 0; i < 256; i++) 186 for (i = 0; i < 256; i++)
167 { 187 {
168 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]);
169 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
170 if ((pfd = open (pty_name, O_RDWR | O_NOCTTY, 0)) == -1) 191 if ((pfd = open (pty_name, O_RDWR | O_NOCTTY, 0)) == -1)
171 { 192 {
172 snprintf(pty_name, 32, "/dev/ptyp%d", i); 193 snprintf(pty_name, 32, "/dev/ptyp%d", i);
173 snprintf(tty_name, 32, "/dev/ttyp%d", i); 194 snprintf(tty_name, 32, "/dev/ttyp%d", i);
174 if ((pfd = open (pty_name, O_RDWR | O_NOCTTY, 0)) == -1) 195 if ((pfd = open (pty_name, O_RDWR | O_NOCTTY, 0)) == -1)
175 continue; 196 continue;
176 } 197 }
198
177 if (access (tty_name, R_OK | W_OK) == 0) 199 if (access (tty_name, R_OK | W_OK) == 0)
178 { 200 {
179 *ttydev = strdup (tty_name); 201 *ttydev = strdup (tty_name);
180 return pfd; 202 return pfd;
181 } 203 }
182 204
183 close (pfd); 205 close (pfd);
184 } 206 }
185} 207
208 return -1;
209 }
210
186#endif 211#endif
187 212
188/*----------------------------------------------------------------------*/ 213/*----------------------------------------------------------------------*/
189/* 214/*
190 * Returns tty file descriptor, or -1 on failure 215 * Returns tty file descriptor, or -1 on failure
191 */ 216 */
192static int 217static int
193get_tty (char *ttydev) 218get_tty (char *ttydev)
194{ 219{
195 return open (ttydev, O_RDWR | O_NOCTTY, 0); 220 return open (ttydev, O_RDWR | O_NOCTTY, 0);
… …
200 * 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
201 */ 226 */
202static int 227static int
203control_tty (int fd_tty) 228control_tty (int fd_tty)
204{ 229{
230 int fd;
231
205 setsid (); 232 setsid ();
206 233
207#if defined(HAVE_DEV_PTMX) && defined(I_PUSH) 234#if defined(HAVE_DEV_PTMX) && defined(I_PUSH)
208 /* 235 /*
209 * Push STREAMS modules: 236 * Push STREAMS modules:
… …
230 ioctl (fd_tty, I_PUSH, "ldterm"); 257 ioctl (fd_tty, I_PUSH, "ldterm");
231 ioctl (fd_tty, I_PUSH, "ttcompat"); 258 ioctl (fd_tty, I_PUSH, "ttcompat");
232 } 259 }
233#endif 260#endif
234 261
262#ifdef TIOCSCTTY
235 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
236 269
237 int fd = open ("/dev/tty", O_WRONLY); 270 fd = open ("/dev/tty", O_WRONLY);
238 if (fd < 0) 271 if (fd < 0)
239 return -1; /* fatal */ 272 return -1; /* fatal */
240 273
241 close (fd); 274 close (fd);
242 275
243 return 0; 276 return 0;
244} 277}
… …
294 { 327 {
295#ifdef TTY_GID_SUPPORT 328#ifdef TTY_GID_SUPPORT
296 struct group *gr = getgrnam ("tty"); 329 struct group *gr = getgrnam ("tty");
297 330
298 if (gr) 331 if (gr)
332 {
299 { /* change group ownership of tty to "tty" */ 333 /* change group ownership of tty to "tty" */
300 mode = S_IRUSR | S_IWUSR | S_IWGRP; 334 mode = S_IRUSR | S_IWUSR | S_IWGRP;
301 gid = gr->gr_gid; 335 gid = gr->gr_gid;
302 } 336 }
303 else 337 else
304#endif /* TTY_GID_SUPPORT */ 338#endif /* TTY_GID_SUPPORT */
305 { 339 {
306 mode = S_IRUSR | S_IWUSR | S_IWGRP | S_IWOTH; 340 mode = S_IRUSR | S_IWUSR | S_IWGRP | S_IWOTH;
307 gid = 0; 341 gid = 0;
308 } 342 }
309 } 343 }
… …
326} 360}
327 361
328void 362void
329ptytty_unix::put () 363ptytty_unix::put ()
330{ 364{
365 if (name)
366 {
331 chmod (name, RESTORE_TTY_MODE); 367 chmod (name, RESTORE_TTY_MODE);
332 chown (name, 0, ttyconf.gid); 368 chown (name, 0, ttyconf.gid);
369 }
333 370
334 close_tty (); 371 close_tty ();
335 372
336 if (pty >= 0) 373 if (pty >= 0)
337 close (pty); 374 close (pty);
… …
370 } 407 }
371 408
372 return true; 409 return true;
373} 410}
374 411
375#if PTYTTY_HELPER
376
377static int sock_fd = -1;
378static int helper_pid, owner_pid;
379
380struct command
381{
382 enum { get, login, destroy } type;
383
384 ptytty *id;
385
386 bool login_shell;
387 int cmd_pid;
388 char hostname[512]; // arbitrary, but should be plenty
389};
390
391struct ptytty_proxy : ptytty
392{
393 ptytty *id;
394
395 ptytty_proxy ()
396 : id(0)
397 {
398 }
399
400 ~ptytty_proxy ();
401
402 bool get ();
403 void login (int cmd_pid, bool login_shell, const char *hostname);
404};
405
406bool
407ptytty_proxy::get ()
408{
409 command cmd;
410
411 cmd.type = command::get;
412
413 write (sock_fd, &cmd, sizeof (cmd));
414
415 if (read (sock_fd, &id, sizeof (id)) != sizeof (id))
416 fatal ("protocol error while creating pty using helper process, aborting.\n");
417
418 if (!id)
419 return false;
420
421 if ((pty = recv_fd (sock_fd)) < 0
422 || (tty = recv_fd (sock_fd)) < 0)
423 fatal ("protocol error while reading pty/tty fds from helper process, aborting.\n");
424
425 return true;
426}
427
428void
429ptytty_proxy::login (int cmd_pid, bool login_shell, const char *hostname)
430{
431 command cmd;
432
433 cmd.type = command::login;
434 cmd.id = id;
435 cmd.cmd_pid = cmd_pid;
436 cmd.login_shell = login_shell;
437 strncpy (cmd.hostname, hostname, sizeof (cmd.hostname));
438
439 write (sock_fd, &cmd, sizeof (cmd));
440}
441
442ptytty_proxy::~ptytty_proxy ()
443{
444 if (id)
445 {
446 command cmd;
447
448 cmd.type = command::destroy;
449 cmd.id = id;
450
451 write (sock_fd, &cmd, sizeof (cmd));
452 }
453}
454
455static
456void serve ()
457{
458 command cmd;
459 vector<ptytty *> ptys;
460
461 while (read (sock_fd, &cmd, sizeof (command)) == sizeof (command))
462 {
463 if (cmd.type == command::get)
464 {
465 // -> id ptyfd ttyfd
466 cmd.id = new ptytty_unix;
467
468 if (cmd.id->get ())
469 {
470 write (sock_fd, &cmd.id, sizeof (cmd.id));
471 ptys.push_back (cmd.id);
472
473 ptytty::send_fd (sock_fd, cmd.id->pty);
474 ptytty::send_fd (sock_fd, cmd.id->tty);
475 }
476 else
477 {
478 delete cmd.id;
479 cmd.id = 0;
480 write (sock_fd, &cmd.id, sizeof (cmd.id));
481 }
482 }
483 else if (cmd.type == command::login)
484 {
485#if UTMP_SUPPORT
486 if (find (ptys.begin (), ptys.end (), cmd.id))
487 {
488 cmd.hostname[sizeof (cmd.hostname) - 1] = 0;
489 cmd.id->login (cmd.cmd_pid, cmd.login_shell, cmd.hostname);
490 }
491#endif
492 }
493 else if (cmd.type == command::destroy)
494 {
495 vector<ptytty *>::iterator pty = find (ptys.begin (), ptys.end (), cmd.id);
496
497 if (pty != ptys.end ())
498 {
499 delete *pty;
500 ptys.erase (pty);
501 }
502 }
503 else
504 break;
505 }
506
507 // destroy all ptys
508 for (vector<ptytty *>::iterator i = ptys.end (); i-- > ptys.begin (); )
509 delete *i;
510}
511
512void
513ptytty::use_helper ()
514{
515 int pid = getpid ();
516
517 if (sock_fd >= 0 && pid == owner_pid)
518 return;
519
520 owner_pid = pid;
521
522 int sv[2];
523
524 if (socketpair (AF_UNIX, SOCK_STREAM, 0, sv))
525 fatal ("could not create socket to communicate with pty/sessiondb helper, aborting.\n");
526
527 helper_pid = fork ();
528
529 if (helper_pid < 0)
530 fatal ("could not create pty/sessiondb helper process, aborting.\n");
531
532 if (helper_pid)
533 {
534 // client, process
535 sock_fd = sv[0];
536 close (sv[1]);
537 fcntl (sock_fd, F_SETFD, FD_CLOEXEC);
538 }
539 else
540 {
541 // server, pty-helper
542 sock_fd = sv[1];
543
544 chdir ("/");
545
546 for (int fd = 0; fd < 1023; fd++)
547 if (fd != sock_fd)
548 close (fd);
549
550 serve ();
551 _exit (EXIT_SUCCESS);
552 }
553}
554
555#endif
556
557ptytty *
558ptytty::create ()
559{
560#if PTYTTY_HELPER
561 if (helper_pid && getpid () == owner_pid)
562 // use helper process
563 return new ptytty_proxy;
564 else
565#endif
566 return new ptytty_unix;
567}
568
569

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