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Comparing libptytty/src/ptytty.C (file contents):
Revision 1.6 by root, Sun Jan 22 00:04:20 2006 UTC vs.
Revision 1.26 by ayin, Wed Jun 13 17:30:54 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)
86 { /* slave now unlocked */ 91 { /* slave now unlocked */
87 *ttydev = strdup (ptsname (pfd)); /* get slave's name */ 92 *ttydev = strdup (ptsname (pfd)); /* get slave's name */
88 return pfd; 93 return pfd;
89 } 94 }
90 95
91 close (pfd); 96 close (pfd);
92 } 97 }
93 98
94 return -1; 99 return -1;
95} 100 }
101
96#elif defined(HAVE_OPENPTY) 102#elif defined(HAVE_OPENPTY)
103
97static int 104 static int
98get_pty (int *fd_tty, char **ttydev) 105 get_pty (int *fd_tty, char **ttydev)
99{ 106 {
100 int pfd; 107 int pfd;
101 int res; 108 int res;
102 char tty_name[32]; 109 char tty_name[32];
103 110
104 res = openpty (&pfd, fd_tty, tty_name, NULL, NULL); 111 res = openpty (&pfd, fd_tty, tty_name, NULL, NULL);
112
105 if (res != -1) 113 if (res != -1)
106 { 114 {
107 *ttydev = strdup (tty_name); 115 *ttydev = strdup (tty_name);
116 return pfd;
117 }
118
119 return -1;
120 }
121
122#elif defined(HAVE__GETPTY)
123
124 static int
125 get_pty (int *fd_tty, char **ttydev)
126 {
127 int pfd;
128
129 *ttydev = _getpty (&pfd, O_RDWR | O_NONBLOCK | O_NOCTTY, 0622, 0);
130
131 if (*ttydev != NULL)
108 return pfd; 132 return pfd;
109 }
110 133
111 return -1; 134 return -1;
112} 135 }
113#elif defined(HAVE__GETPTY)
114static int
115get_pty (int *fd_tty, char **ttydev)
116{
117 int pfd;
118 136
119 *ttydev = _getpty (&pfd, O_RDWR | O_NONBLOCK | O_NOCTTY, 0622, 0);
120 if (*ttydev != NULL)
121 return pfd;
122
123 return -1;
124}
125#elif defined(HAVE_DEV_PTC) 137#elif defined(HAVE_DEV_PTC)
138
126static int 139 static int
127get_pty (int *fd_tty, char **ttydev) 140 get_pty (int *fd_tty, char **ttydev)
128{ 141 {
129 int pfd; 142 int pfd;
130 143
131 if ((pfd = open ("/dev/ptc", O_RDWR | O_NOCTTY, 0)) >= 0) 144 if ((pfd = open ("/dev/ptc", O_RDWR | O_NOCTTY, 0)) >= 0)
132 { 145 {
133 *ttydev = strdup (ttyname (pfd)); 146 *ttydev = strdup (ttyname (pfd));
134 return pfd; 147 return pfd;
135 } 148 }
136 149
137 return -1; 150 return -1;
138} 151 }
152
139#elif defined(HAVE_DEV_CLONE) 153#elif defined(HAVE_DEV_CLONE)
154
140static int 155 static int
141get_pty (int *fd_tty, char **ttydev) 156 get_pty (int *fd_tty, char **ttydev)
142{ 157 {
143 int pfd; 158 int pfd;
144 159
145 if ((pfd = open ("/dev/ptym/clone", O_RDWR | O_NOCTTY, 0)) >= 0) 160 if ((pfd = open ("/dev/ptym/clone", O_RDWR | O_NOCTTY, 0)) >= 0)
146 { 161 {
147 *ttydev = strdup (ptsname (pfd)); 162 *ttydev = strdup (ptsname (pfd));
148 return pfd; 163 return pfd;
149 } 164 }
150 165
151 return -1; 166 return -1;
152} 167 }
168
153#else 169#else
170
154/* Based on the code in openssh/openbsd-compat/bsd-openpty.c */ 171 /* Based on the code in openssh/openbsd-compat/bsd-openpty.c */
155static int 172 static int
156get_pty (int *fd_tty, char **ttydev) 173 get_pty (int *fd_tty, char **ttydev)
157{ 174 {
158 int pfd; 175 int pfd;
159 int i; 176 int i;
160 char pty_name[32]; 177 char pty_name[32];
161 char tty_name[32]; 178 char tty_name[32];
162 const char *majors = "pqrstuvwxyzabcde"; 179 const char *majors = "pqrstuvwxyzabcde";
163 const char *minors = "0123456789abcdef"; 180 const char *minors = "0123456789abcdef";
181
164 for (i = 0; i < 256; i++) 182 for (i = 0; i < 256; i++)
165 { 183 {
166 snprintf(pty_name, 32, "/dev/pty%c%c", majors[i / 16], minors[i % 16]); 184 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]); 185 snprintf(tty_name, 32, "/dev/tty%c%c", majors[i / 16], minors[i % 16]);
186
168 if ((pfd = open (pty_name, O_RDWR | O_NOCTTY, 0)) == -1) 187 if ((pfd = open (pty_name, O_RDWR | O_NOCTTY, 0)) == -1)
169 { 188 {
170 snprintf(pty_name, 32, "/dev/ptyp%d", i); 189 snprintf(pty_name, 32, "/dev/ptyp%d", i);
171 snprintf(tty_name, 32, "/dev/ttyp%d", i); 190 snprintf(tty_name, 32, "/dev/ttyp%d", i);
172 if ((pfd = open (pty_name, O_RDWR | O_NOCTTY, 0)) == -1) 191 if ((pfd = open (pty_name, O_RDWR | O_NOCTTY, 0)) == -1)
173 continue; 192 continue;
174 } 193 }
194
175 if (access (tty_name, R_OK | W_OK) == 0) 195 if (access (tty_name, R_OK | W_OK) == 0)
176 { 196 {
177 *ttydev = strdup (tty_name); 197 *ttydev = strdup (tty_name);
178 return pfd; 198 return pfd;
179 } 199 }
180 200
181 close (pfd); 201 close (pfd);
182 } 202 }
183} 203
204 return -1;
205 }
206
184#endif 207#endif
185 208
186/*----------------------------------------------------------------------*/ 209/*----------------------------------------------------------------------*/
187/* 210/*
188 * Returns tty file descriptor, or -1 on failure 211 * Returns tty file descriptor, or -1 on failure
189 */ 212 */
190static int 213static int
191get_tty (char *ttydev) 214get_tty (char *ttydev)
192{ 215{
193 return open (ttydev, O_RDWR | O_NOCTTY, 0); 216 return open (ttydev, O_RDWR | O_NOCTTY, 0);
… …
232 255
233 ioctl (fd_tty, TIOCSCTTY, NULL); 256 ioctl (fd_tty, TIOCSCTTY, NULL);
234 257
235 int fd = open ("/dev/tty", O_WRONLY); 258 int fd = open ("/dev/tty", O_WRONLY);
236 if (fd < 0) 259 if (fd < 0)
237 return -1; /* fatal */ 260 return -1; /* fatal */
238 261
239 close (fd); 262 close (fd);
240 263
241 return 0; 264 return 0;
242} 265}
… …
324} 347}
325 348
326void 349void
327ptytty_unix::put () 350ptytty_unix::put ()
328{ 351{
352 if (name)
353 {
329 chmod (name, RESTORE_TTY_MODE); 354 chmod (name, RESTORE_TTY_MODE);
330 chown (name, 0, ttyconf.gid); 355 chown (name, 0, ttyconf.gid);
356 }
331 357
332 close_tty (); 358 close_tty ();
333 359
334 if (pty >= 0) 360 if (pty >= 0)
335 close (pty); 361 close (pty);
… …
368 } 394 }
369 395
370 return true; 396 return true;
371} 397}
372 398
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 : ptytty
390{
391 ptytty *id;
392
393 ~ptytty_proxy ()
394 : id(0)
395 {
396 }
397
398 ~ptytty_proxy ();
399
400 bool get ();
401 void login (int cmd_pid, bool login_shell, const char *hostname);
402};
403
404bool
405ptytty_proxy::get ()
406{
407 command cmd;
408
409 cmd.type = command::get;
410
411 write (sock_fd, &cmd, sizeof (cmd));
412
413 if (read (sock_fd, &id, sizeof (id)) != sizeof (id))
414 fatal ("protocol error while creating pty using helper process, aborting.\n");
415
416 if (!id)
417 return false;
418
419 if ((pty = ptytty_recv_fd (sock_fd)) < 0
420 || (tty = ptytty_recv_fd (sock_fd)) < 0)
421 fatal ("protocol error while reading pty/tty fds from helper process, aborting.\n");
422
423 return true;
424}
425
426void
427ptytty_proxy::login (int cmd_pid, bool login_shell, const char *hostname)
428{
429 command cmd;
430
431 cmd.type = command::login;
432 cmd.id = id;
433 cmd.cmd_pid = cmd_pid;
434 cmd.login_shell = login_shell;
435 strncpy (cmd.hostname, hostname, sizeof (cmd.hostname));
436
437 write (sock_fd, &cmd, sizeof (cmd));
438}
439
440ptytty_proxy::~ptytty_proxy ()
441{
442 if (id)
443 {
444 command cmd;
445
446 cmd.type = command::destroy;
447 cmd.id = id;
448
449 write (sock_fd, &cmd, sizeof (cmd));
450 }
451}
452
453static
454void serve ()
455{
456 command cmd;
457 vector<ptytty *> ptys;
458
459 while (read (sock_fd, &cmd, sizeof (command)) == sizeof (command))
460 {
461 if (cmd.type == command::get)
462 {
463 // -> id ptyfd ttyfd
464 cmd.id = new ptytty_unix;
465
466 if (cmd.id->get ())
467 {
468 write (sock_fd, &cmd.id, sizeof (cmd.id));
469 ptys.push_back (cmd.id);
470
471 ptytty_send_fd (sock_fd, cmd.id->pty);
472 ptytty_send_fd (sock_fd, cmd.id->tty);
473 }
474 else
475 {
476 delete cmd.id;
477 cmd.id = 0;
478 write (sock_fd, &cmd.id, sizeof (cmd.id));
479 }
480 }
481 else if (cmd.type == command::login)
482 {
483#if UTMP_SUPPORT
484 if (find (ptys.begin (), ptys.end (), cmd.id))
485 {
486 cmd.hostname[sizeof (cmd.hostname) - 1] = 0;
487 cmd.id->login (cmd.cmd_pid, cmd.login_shell, cmd.hostname);
488 }
489#endif
490 }
491 else if (cmd.type == command::destroy)
492 {
493 ptytty **pty = find (ptys.begin (), ptys.end (), cmd.id);
494
495 if (pty)
496 {
497 delete *pty;
498 ptys.erase (pty);
499 }
500 }
501 else
502 break;
503 }
504
505 // destroy all ptys
506 for (ptytty **i = ptys.end (); i-- > ptys.begin (); )
507 delete *i;
508}
509
510void ptytty_server ()
511{
512 int sv[2];
513
514 if (socketpair (AF_UNIX, SOCK_STREAM, 0, sv))
515 fatal ("could not create socket to communicate with pty/sessiondb helper, aborting.\n");
516
517 pid = fork ();
518
519 if (pid < 0)
520 fatal ("could not create pty/sessiondb helper process, aborting.\n");
521
522 if (pid)
523 {
524 // client, process
525 sock_fd = sv[0];
526 close (sv[1]);
527 fcntl (sock_fd, F_SETFD, FD_CLOEXEC);
528 }
529 else
530 {
531 // server, pty-helper
532 sock_fd = sv[1];
533
534 for (int fd = 0; fd < 1023; fd++)
535 if (fd != sock_fd)
536 close (fd);
537
538 serve ();
539 _exit (EXIT_SUCCESS);
540 }
541}
542
543#endif
544
545// a "factory" *g*
546ptytty *
547new_ptytty ()
548{
549#if PTYTTY_HELPER
550 if (pid > 0)
551 // use helper process
552 return new ptytty_proxy;
553 else
554#endif
555 return new ptytty_unix;
556}
557
558/*----------------------- end-of-file (C source) -----------------------*/
559

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