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Comparing libptytty/src/ptytty.C (file contents):
Revision 1.4 by root, Sat Jan 21 22:08:20 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"
25 29
26#include "fdpass.h"
27#include "ptytty.h" 30#include "ptytty.h"
28 31
29#include <cstdlib> 32#include <cstdlib>
30#include <cstring> 33#include <cstring>
34#include <csignal>
31 35
32#include <sys/types.h> 36#include <sys/types.h>
33#include <sys/socket.h>
34#include <unistd.h> 37#include <unistd.h>
35#include <fcntl.h> 38#include <fcntl.h>
36 39
37#ifdef HAVE_SYS_IOCTL_H 40#ifdef HAVE_SYS_IOCTL_H
38# include <sys/ioctl.h> 41# include <sys/ioctl.h>
… …
60 63
61/* ------------------------------------------------------------------------- * 64/* ------------------------------------------------------------------------- *
62 * GET PSEUDO TELETYPE - MASTER AND SLAVE * 65 * GET PSEUDO TELETYPE - MASTER AND SLAVE *
63 * ------------------------------------------------------------------------- */ 66 * ------------------------------------------------------------------------- */
64/* 67/*
65 * Returns pty file descriptor, or -1 on failure 68 * Returns pty file descriptor, or -1 on failure
66 * 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.
67 * 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
68 */ 71 */
69#if defined(UNIX98_PTY) 72#if defined(UNIX98_PTY)
73
70static int 74 static int
71get_pty (int *fd_tty, char **ttydev) 75 get_pty (int *fd_tty, char **ttydev)
72{ 76 {
73 int pfd; 77 int pfd;
74 78
75# if defined(HAVE_GETPT) 79# if defined(HAVE_GETPT)
76 pfd = getpt(); 80 pfd = getpt();
77# elif defined(HAVE_POSIX_OPENPT) 81# elif defined(HAVE_POSIX_OPENPT)
78 pfd = posix_openpt (O_RDWR); 82 pfd = posix_openpt (O_RDWR);
79# else 83# else
80 pfd = open (CLONE_DEVICE, O_RDWR | O_NOCTTY, 0); 84 pfd = open (CLONE_DEVICE, O_RDWR | O_NOCTTY, 0);
81# endif 85# endif
86
82 if (pfd >= 0) 87 if (pfd >= 0)
83 { 88 {
84 if (grantpt (pfd) == 0 /* change slave permissions */ 89 if (grantpt (pfd) == 0 /* change slave permissions */
85 && unlockpt (pfd) == 0) 90 && unlockpt (pfd) == 0)
91 {
86 { /* slave now unlocked */ 92 /* slave now unlocked */
87 *ttydev = strdup (ptsname (pfd)); /* get slave's name */ 93 *ttydev = strdup (ptsname (pfd)); /* get slave's name */
88 return pfd; 94 return pfd;
89 } 95 }
90 96
91 close (pfd); 97 close (pfd);
92 } 98 }
93 99
94 return -1; 100 return -1;
95} 101 }
102
96#elif defined(HAVE_OPENPTY) 103#elif defined(HAVE_OPENPTY)
104
97static int 105 static int
98get_pty (int *fd_tty, char **ttydev) 106 get_pty (int *fd_tty, char **ttydev)
99{ 107 {
100 int pfd; 108 int pfd;
101 int res; 109 int res;
102 char tty_name[32]; 110
103
104 res = openpty (&pfd, fd_tty, tty_name, NULL, NULL); 111 res = openpty (&pfd, fd_tty, NULL, NULL, NULL);
112
105 if (res != -1) 113 if (res != -1)
106 { 114 {
107 *ttydev = strdup (tty_name); 115 *ttydev = strdup (ttyname (*fd_tty));
108 return pfd; 116 return pfd;
109 } 117 }
110 118
111 return -1; 119 return -1;
112} 120 }
121
113#elif defined(HAVE__GETPTY) 122#elif defined(HAVE__GETPTY)
123
114static int 124 static int
115get_pty (int *fd_tty, char **ttydev) 125 get_pty (int *fd_tty, char **ttydev)
116{ 126 {
117 int pfd; 127 int pfd;
128 char *slave;
118 129
119 *ttydev = _getpty (&pfd, O_RDWR | O_NONBLOCK | O_NOCTTY, 0622, 0); 130 slave = _getpty (&pfd, O_RDWR | O_NONBLOCK | O_NOCTTY, 0622, 0);
120 if (*ttydev != NULL) 131
132 if (slave != NULL)
133 {
134 *ttydev = strdup (slave);
121 return pfd; 135 return pfd;
136 }
122 137
123 return -1; 138 return -1;
124} 139 }
140
125#elif defined(HAVE_DEV_PTC) 141#elif defined(HAVE_DEV_PTC)
142
126static int 143 static int
127get_pty (int *fd_tty, char **ttydev) 144 get_pty (int *fd_tty, char **ttydev)
128{ 145 {
129 int pfd; 146 int pfd;
130 147
131 if ((pfd = open ("/dev/ptc", O_RDWR | O_NOCTTY, 0)) >= 0) 148 if ((pfd = open ("/dev/ptc", O_RDWR | O_NOCTTY, 0)) >= 0)
132 { 149 {
133 *ttydev = strdup (ttyname (pfd)); 150 *ttydev = strdup (ttyname (pfd));
134 return pfd; 151 return pfd;
135 } 152 }
136 153
137 return -1; 154 return -1;
138} 155 }
156
139#elif defined(HAVE_DEV_CLONE) 157#elif defined(HAVE_DEV_CLONE)
158
140static int 159 static int
141get_pty (int *fd_tty, char **ttydev) 160 get_pty (int *fd_tty, char **ttydev)
142{ 161 {
143 int pfd; 162 int pfd;
144 163
145 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)
146 { 165 {
147 *ttydev = strdup (ptsname (pfd)); 166 *ttydev = strdup (ptsname (pfd));
148 return pfd; 167 return pfd;
149 } 168 }
150 169
151 return -1; 170 return -1;
152} 171 }
172
153#else 173#else
174
154/* Based on the code in openssh/openbsd-compat/bsd-openpty.c */ 175 /* Based on the code in openssh/openbsd-compat/bsd-openpty.c */
155static int 176 static int
156get_pty (int *fd_tty, char **ttydev) 177 get_pty (int *fd_tty, char **ttydev)
157{ 178 {
158 int pfd; 179 int pfd;
159 int i; 180 int i;
160 char pty_name[32]; 181 char pty_name[32];
161 char tty_name[32]; 182 char tty_name[32];
162 const char *majors = "pqrstuvwxyzabcde"; 183 const char *majors = "pqrstuvwxyzabcde";
163 const char *minors = "0123456789abcdef"; 184 const char *minors = "0123456789abcdef";
185
164 for (i = 0; i < 256; i++) 186 for (i = 0; i < 256; i++)
165 { 187 {
166 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]);
167 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
168 if ((pfd = open (pty_name, O_RDWR | O_NOCTTY, 0)) == -1) 191 if ((pfd = open (pty_name, O_RDWR | O_NOCTTY, 0)) == -1)
169 { 192 {
170 snprintf(pty_name, 32, "/dev/ptyp%d", i); 193 snprintf(pty_name, 32, "/dev/ptyp%d", i);
171 snprintf(tty_name, 32, "/dev/ttyp%d", i); 194 snprintf(tty_name, 32, "/dev/ttyp%d", i);
172 if ((pfd = open (pty_name, O_RDWR | O_NOCTTY, 0)) == -1) 195 if ((pfd = open (pty_name, O_RDWR | O_NOCTTY, 0)) == -1)
173 continue; 196 continue;
174 } 197 }
198
175 if (access (tty_name, R_OK | W_OK) == 0) 199 if (access (tty_name, R_OK | W_OK) == 0)
176 { 200 {
177 *ttydev = strdup (tty_name); 201 *ttydev = strdup (tty_name);
178 return pfd; 202 return pfd;
179 } 203 }
180 204
181 close (pfd); 205 close (pfd);
182 } 206 }
183} 207
208 return -1;
209 }
210
184#endif 211#endif
185 212
186/*----------------------------------------------------------------------*/ 213/*----------------------------------------------------------------------*/
187/* 214/*
188 * Returns tty file descriptor, or -1 on failure 215 * Returns tty file descriptor, or -1 on failure
189 */ 216 */
190static int 217static int
191get_tty (char *ttydev) 218get_tty (char *ttydev)
192{ 219{
193 return open (ttydev, O_RDWR | O_NOCTTY, 0); 220 return open (ttydev, O_RDWR | O_NOCTTY, 0);
… …
198 * 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
199 */ 226 */
200static int 227static int
201control_tty (int fd_tty) 228control_tty (int fd_tty)
202{ 229{
230 int fd;
231
203 setsid (); 232 setsid ();
204 233
205#if defined(HAVE_DEV_PTMX) && defined(I_PUSH) 234#if defined(HAVE_DEV_PTMX) && defined(I_PUSH)
206 /* 235 /*
207 * Push STREAMS modules: 236 * Push STREAMS modules:
… …
228 ioctl (fd_tty, I_PUSH, "ldterm"); 257 ioctl (fd_tty, I_PUSH, "ldterm");
229 ioctl (fd_tty, I_PUSH, "ttcompat"); 258 ioctl (fd_tty, I_PUSH, "ttcompat");
230 } 259 }
231#endif 260#endif
232 261
262#ifdef TIOCSCTTY
233 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
234 269
235 int fd = open ("/dev/tty", O_WRONLY); 270 fd = open ("/dev/tty", O_WRONLY);
236 if (fd < 0) 271 if (fd < 0)
237 return -1; /* fatal */ 272 return -1; /* fatal */
238 273
239 close (fd); 274 close (fd);
240 275
241 return 0; 276 return 0;
242} 277}
… …
292 { 327 {
293#ifdef TTY_GID_SUPPORT 328#ifdef TTY_GID_SUPPORT
294 struct group *gr = getgrnam ("tty"); 329 struct group *gr = getgrnam ("tty");
295 330
296 if (gr) 331 if (gr)
332 {
297 { /* change group ownership of tty to "tty" */ 333 /* change group ownership of tty to "tty" */
298 mode = S_IRUSR | S_IWUSR | S_IWGRP; 334 mode = S_IRUSR | S_IWUSR | S_IWGRP;
299 gid = gr->gr_gid; 335 gid = gr->gr_gid;
300 } 336 }
301 else 337 else
302#endif /* TTY_GID_SUPPORT */ 338#endif /* TTY_GID_SUPPORT */
303 { 339 {
304 mode = S_IRUSR | S_IWUSR | S_IWGRP | S_IWOTH; 340 mode = S_IRUSR | S_IWUSR | S_IWGRP | S_IWOTH;
305 gid = 0; 341 gid = 0;
306 } 342 }
307 } 343 }
… …
324} 360}
325 361
326void 362void
327ptytty_unix::put () 363ptytty_unix::put ()
328{ 364{
365 if (name)
366 {
329 chmod (name, RESTORE_TTY_MODE); 367 chmod (name, RESTORE_TTY_MODE);
330 chown (name, 0, ttyconf.gid); 368 chown (name, 0, ttyconf.gid);
369 }
331 370
332 close_tty (); 371 close_tty ();
333 372
334 if (pty >= 0) 373 if (pty >= 0)
335 close (pty); 374 close (pty);
… …
368 } 407 }
369 408
370 return true; 409 return true;
371} 410}
372 411
373#if PTYTTY_HELPER
374
375static int sock_fd;
376static int pid;
377
378struct command
379{
380 enum { get, login, destroy } type;
381
382 ptytty *id;
383
384 bool login_shell;
385 int cmd_pid;
386 char hostname[512]; // arbitrary, but should be plenty
387};
388
389struct ptytty_proxy : zero_initialized, ptytty
390{
391 ptytty *id;
392
393 ~ptytty_proxy ();
394
395 bool get ();
396 void login (int cmd_pid, bool login_shell, const char *hostname);
397};
398
399bool
400ptytty_proxy::get ()
401{
402 command cmd;
403
404 cmd.type = command::get;
405
406 write (sock_fd, &cmd, sizeof (cmd));
407
408 if (read (sock_fd, &id, sizeof (id)) != sizeof (id))
409 fatal ("protocol error while creating pty using helper process, aborting.\n");
410
411 if (!id)
412 return false;
413
414 if ((pty = ptytty_recv_fd (sock_fd)) < 0
415 || (tty = ptytty_recv_fd (sock_fd)) < 0)
416 fatal ("protocol error while reading pty/tty fds from helper process, aborting.\n");
417
418 return true;
419}
420
421void
422ptytty_proxy::login (int cmd_pid, bool login_shell, const char *hostname)
423{
424 command cmd;
425
426 cmd.type = command::login;
427 cmd.id = id;
428 cmd.cmd_pid = cmd_pid;
429 cmd.login_shell = login_shell;
430 strncpy (cmd.hostname, hostname, sizeof (cmd.hostname));
431
432 write (sock_fd, &cmd, sizeof (cmd));
433}
434
435ptytty_proxy::~ptytty_proxy ()
436{
437 command cmd;
438
439 cmd.type = command::destroy;
440 cmd.id = id;
441
442 write (sock_fd, &cmd, sizeof (cmd));
443}
444
445static
446void serve ()
447{
448 command cmd;
449 vector<ptytty *> ptys;
450
451 while (read (sock_fd, &cmd, sizeof (command)) == sizeof (command))
452 {
453 if (cmd.type == command::get)
454 {
455 // -> id ptyfd ttyfd
456 cmd.id = new ptytty_unix;
457
458 if (cmd.id->get ())
459 {
460 write (sock_fd, &cmd.id, sizeof (cmd.id));
461 ptys.push_back (cmd.id);
462
463 ptytty_send_fd (sock_fd, cmd.id->pty);
464 ptytty_send_fd (sock_fd, cmd.id->tty);
465 }
466 else
467 {
468 delete cmd.id;
469 cmd.id = 0;
470 write (sock_fd, &cmd.id, sizeof (cmd.id));
471 }
472 }
473 else if (cmd.type == command::login)
474 {
475#if UTMP_SUPPORT
476 if (find (ptys.begin (), ptys.end (), cmd.id))
477 {
478 cmd.hostname[sizeof (cmd.hostname) - 1] = 0;
479 cmd.id->login (cmd.cmd_pid, cmd.login_shell, cmd.hostname);
480 }
481#endif
482 }
483 else if (cmd.type == command::destroy)
484 {
485 ptytty **pty = find (ptys.begin (), ptys.end (), cmd.id);
486
487 if (pty)
488 {
489 delete *pty;
490 ptys.erase (pty);
491 }
492 }
493 else
494 break;
495 }
496
497 // destroy all ptys
498 for (ptytty **i = ptys.end (); i-- > ptys.begin (); )
499 delete *i;
500}
501
502void ptytty_server ()
503{
504 int sv[2];
505
506 if (socketpair (AF_UNIX, SOCK_STREAM, 0, sv))
507 fatal ("could not create socket to communicate with pty/sessiondb helper, aborting.\n");
508
509 pid = fork ();
510
511 if (pid < 0)
512 fatal ("could not create pty/sessiondb helper process, aborting.\n");
513
514 if (pid)
515 {
516 // client, urxvt
517 sock_fd = sv[0];
518 close (sv[1]);
519 fcntl (sock_fd, F_SETFD, FD_CLOEXEC);
520 }
521 else
522 {
523 // server, pty-helper
524 sock_fd = sv[1];
525
526 for (int fd = 0; fd < 1023; fd++)
527 if (fd != sock_fd)
528 close (fd);
529
530 serve ();
531 _exit (EXIT_SUCCESS);
532 }
533}
534
535#endif
536
537// a "factory" *g*
538ptytty *
539new_ptytty ()
540{
541#if PTYTTY_HELPER
542 if (pid > 0)
543 // use helper process
544 return new ptytty_proxy;
545 else
546#endif
547 return new ptytty_unix;
548}
549
550/*----------------------- end-of-file (C source) -----------------------*/
551

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