| 1 |
/*----------------------------------------------------------------------* |
| 2 |
* File: ptytty.C |
| 3 |
*----------------------------------------------------------------------* |
| 4 |
* |
| 5 |
* All portions of code are copyright by their respective author/s. |
| 6 |
* Copyright (c) 1999-2001 Geoff Wing <gcw@pobox.com> |
| 7 |
* Copyright (c) 2004-2006 Marc Lehmann <schmorp@schmorp.de> |
| 8 |
* Copyright (c) 2006 Emanuele Giaquinta <e.giaquinta@glauco.it> |
| 9 |
* |
| 10 |
* This program is free software; you can redistribute it and/or modify |
| 11 |
* it under the terms of the GNU General Public License as published by |
| 12 |
* the Free Software Foundation; either version 2 of the License, or |
| 13 |
* (at your option) any later version. |
| 14 |
* |
| 15 |
* This program is distributed in the hope that it will be useful, |
| 16 |
* but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 17 |
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 18 |
* GNU General Public License for more details. |
| 19 |
* |
| 20 |
* You should have received a copy of the GNU General Public License |
| 21 |
* along with this program; if not, write to the Free Software |
| 22 |
* Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. |
| 23 |
*---------------------------------------------------------------------*/ |
| 24 |
|
| 25 |
#include "config.h" |
| 26 |
|
| 27 |
#include "ptytty.h" |
| 28 |
|
| 29 |
#include <stdlib.h> |
| 30 |
#include <stdio.h> |
| 31 |
#include <string.h> |
| 32 |
|
| 33 |
#include <sys/types.h> |
| 34 |
#include <sys/stat.h> |
| 35 |
#include <unistd.h> |
| 36 |
#include <fcntl.h> |
| 37 |
|
| 38 |
#ifdef HAVE_SYS_IOCTL_H |
| 39 |
# include <sys/ioctl.h> |
| 40 |
#endif |
| 41 |
#ifdef HAVE_STROPTS_H |
| 42 |
# include <stropts.h> |
| 43 |
#endif |
| 44 |
#if defined(HAVE_PTY_H) |
| 45 |
# include <pty.h> |
| 46 |
#elif defined(HAVE_LIBUTIL_H) |
| 47 |
# include <libutil.h> |
| 48 |
#elif defined(HAVE_UTIL_H) |
| 49 |
# include <util.h> |
| 50 |
#endif |
| 51 |
#ifdef TTY_GID_SUPPORT |
| 52 |
#include <grp.h> |
| 53 |
#endif |
| 54 |
|
| 55 |
#ifndef O_NOCTTY |
| 56 |
# define O_NOCTTY 0 |
| 57 |
#endif |
| 58 |
|
| 59 |
///////////////////////////////////////////////////////////////////////////// |
| 60 |
|
| 61 |
/* ------------------------------------------------------------------------- * |
| 62 |
* GET PSEUDO TELETYPE - MASTER AND SLAVE * |
| 63 |
* ------------------------------------------------------------------------- */ |
| 64 |
/* |
| 65 |
* Returns pty file descriptor, or -1 on failure |
| 66 |
* 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 |
| 68 |
*/ |
| 69 |
#if defined(UNIX98_PTY) |
| 70 |
|
| 71 |
static int |
| 72 |
get_pty (int *fd_tty, char **ttydev) |
| 73 |
{ |
| 74 |
int pfd; |
| 75 |
|
| 76 |
# if defined(HAVE_GETPT) |
| 77 |
pfd = getpt (); |
| 78 |
# elif defined(HAVE_POSIX_OPENPT) |
| 79 |
pfd = posix_openpt (O_RDWR | O_NOCTTY); |
| 80 |
# else |
| 81 |
# ifdef _AIX |
| 82 |
pfd = open ("/dev/ptc", O_RDWR | O_NOCTTY, 0); |
| 83 |
# else |
| 84 |
pfd = open ("/dev/ptmx", O_RDWR | O_NOCTTY, 0); |
| 85 |
# endif |
| 86 |
# endif |
| 87 |
|
| 88 |
if (pfd >= 0) |
| 89 |
{ |
| 90 |
if (grantpt (pfd) == 0 /* change slave permissions */ |
| 91 |
&& unlockpt (pfd) == 0) |
| 92 |
{ |
| 93 |
/* slave now unlocked */ |
| 94 |
*ttydev = strdup (ptsname (pfd)); /* get slave's name */ |
| 95 |
return pfd; |
| 96 |
} |
| 97 |
|
| 98 |
close (pfd); |
| 99 |
} |
| 100 |
|
| 101 |
return -1; |
| 102 |
} |
| 103 |
|
| 104 |
#elif defined(HAVE_OPENPTY) |
| 105 |
|
| 106 |
static int |
| 107 |
get_pty (int *fd_tty, char **ttydev) |
| 108 |
{ |
| 109 |
int pfd; |
| 110 |
int res; |
| 111 |
|
| 112 |
res = openpty (&pfd, fd_tty, NULL, NULL, NULL); |
| 113 |
|
| 114 |
if (res != -1) |
| 115 |
{ |
| 116 |
*ttydev = strdup (ttyname (*fd_tty)); |
| 117 |
return pfd; |
| 118 |
} |
| 119 |
|
| 120 |
return -1; |
| 121 |
} |
| 122 |
|
| 123 |
#elif defined(HAVE__GETPTY) |
| 124 |
|
| 125 |
static int |
| 126 |
get_pty (int *fd_tty, char **ttydev) |
| 127 |
{ |
| 128 |
int pfd; |
| 129 |
char *slave; |
| 130 |
|
| 131 |
slave = _getpty (&pfd, O_RDWR | O_NOCTTY, 0622, 0); |
| 132 |
|
| 133 |
if (slave != NULL) |
| 134 |
{ |
| 135 |
*ttydev = strdup (slave); |
| 136 |
return pfd; |
| 137 |
} |
| 138 |
|
| 139 |
return -1; |
| 140 |
} |
| 141 |
|
| 142 |
#else |
| 143 |
|
| 144 |
/* Based on the code in openssh/openbsd-compat/bsd-openpty.c */ |
| 145 |
static int |
| 146 |
get_pty (int *fd_tty, char **ttydev) |
| 147 |
{ |
| 148 |
int pfd; |
| 149 |
int i; |
| 150 |
char pty_name[32]; |
| 151 |
char tty_name[32]; |
| 152 |
const char *majors = "pqrstuvwxyzabcde"; |
| 153 |
const char *minors = "0123456789abcdef"; |
| 154 |
|
| 155 |
for (i = 0; i < 256; i++) |
| 156 |
{ |
| 157 |
snprintf (pty_name, 32, "/dev/pty%c%c", majors[i / 16], minors[i % 16]); |
| 158 |
snprintf (tty_name, 32, "/dev/tty%c%c", majors[i / 16], minors[i % 16]); |
| 159 |
|
| 160 |
if ((pfd = open (pty_name, O_RDWR | O_NOCTTY, 0)) == -1) |
| 161 |
{ |
| 162 |
snprintf (pty_name, 32, "/dev/ptyp%d", i); |
| 163 |
snprintf (tty_name, 32, "/dev/ttyp%d", i); |
| 164 |
if ((pfd = open (pty_name, O_RDWR | O_NOCTTY, 0)) == -1) |
| 165 |
continue; |
| 166 |
} |
| 167 |
|
| 168 |
if (access (tty_name, R_OK | W_OK) == 0) |
| 169 |
{ |
| 170 |
*ttydev = strdup (tty_name); |
| 171 |
return pfd; |
| 172 |
} |
| 173 |
|
| 174 |
close (pfd); |
| 175 |
} |
| 176 |
|
| 177 |
return -1; |
| 178 |
} |
| 179 |
|
| 180 |
#endif |
| 181 |
|
| 182 |
/*----------------------------------------------------------------------*/ |
| 183 |
/* |
| 184 |
* Returns tty file descriptor, or -1 on failure |
| 185 |
*/ |
| 186 |
static int |
| 187 |
get_tty (char *ttydev) |
| 188 |
{ |
| 189 |
return open (ttydev, O_RDWR | O_NOCTTY, 0); |
| 190 |
} |
| 191 |
|
| 192 |
/*----------------------------------------------------------------------*/ |
| 193 |
/* |
| 194 |
* Make our tty a controlling tty so that /dev/tty points to us |
| 195 |
*/ |
| 196 |
static int |
| 197 |
control_tty (int fd_tty) |
| 198 |
{ |
| 199 |
int fd; |
| 200 |
|
| 201 |
setsid (); |
| 202 |
|
| 203 |
#ifdef TIOCSCTTY |
| 204 |
ioctl (fd_tty, TIOCSCTTY, NULL); |
| 205 |
#else |
| 206 |
fd = open (ttyname (fd_tty), O_RDWR); |
| 207 |
if (fd >= 0) |
| 208 |
close (fd); |
| 209 |
#endif |
| 210 |
|
| 211 |
fd = open ("/dev/tty", O_WRONLY); |
| 212 |
if (fd < 0) |
| 213 |
return -1; /* fatal */ |
| 214 |
|
| 215 |
close (fd); |
| 216 |
|
| 217 |
return 0; |
| 218 |
} |
| 219 |
|
| 220 |
void |
| 221 |
ptytty::close_tty () |
| 222 |
{ |
| 223 |
if (tty < 0) |
| 224 |
return; |
| 225 |
|
| 226 |
close (tty); |
| 227 |
tty = -1; |
| 228 |
} |
| 229 |
|
| 230 |
bool |
| 231 |
ptytty::make_controlling_tty () |
| 232 |
{ |
| 233 |
return control_tty (tty) >= 0; |
| 234 |
} |
| 235 |
|
| 236 |
void |
| 237 |
ptytty::set_utf8_mode (bool on) |
| 238 |
{ |
| 239 |
#ifdef IUTF8 |
| 240 |
if (pty < 0) |
| 241 |
return; |
| 242 |
|
| 243 |
struct termios tio; |
| 244 |
|
| 245 |
if (tcgetattr (pty, &tio) != -1) |
| 246 |
{ |
| 247 |
tcflag_t new_cflag = tio.c_iflag; |
| 248 |
|
| 249 |
if (on) |
| 250 |
new_cflag |= IUTF8; |
| 251 |
else |
| 252 |
new_cflag &= ~IUTF8; |
| 253 |
|
| 254 |
if (new_cflag != tio.c_iflag) |
| 255 |
{ |
| 256 |
tio.c_iflag = new_cflag; |
| 257 |
tcsetattr (pty, TCSANOW, &tio); |
| 258 |
} |
| 259 |
} |
| 260 |
#endif |
| 261 |
} |
| 262 |
|
| 263 |
static struct ttyconf { |
| 264 |
gid_t gid; |
| 265 |
mode_t mode; |
| 266 |
|
| 267 |
ttyconf () |
| 268 |
{ |
| 269 |
#ifdef TTY_GID_SUPPORT |
| 270 |
struct group *gr = getgrnam ("tty"); |
| 271 |
|
| 272 |
if (gr) |
| 273 |
{ |
| 274 |
/* change group ownership of tty to "tty" */ |
| 275 |
mode = S_IRUSR | S_IWUSR | S_IWGRP; |
| 276 |
gid = gr->gr_gid; |
| 277 |
} |
| 278 |
else |
| 279 |
#endif /* TTY_GID_SUPPORT */ |
| 280 |
{ |
| 281 |
mode = S_IRUSR | S_IWUSR | S_IWGRP | S_IWOTH; |
| 282 |
gid = 0; |
| 283 |
} |
| 284 |
} |
| 285 |
} ttyconf; |
| 286 |
|
| 287 |
ptytty_unix::ptytty_unix () |
| 288 |
{ |
| 289 |
name = 0; |
| 290 |
#if UTMP_SUPPORT |
| 291 |
cmd_pid = 0; |
| 292 |
#endif |
| 293 |
} |
| 294 |
|
| 295 |
ptytty_unix::~ptytty_unix () |
| 296 |
{ |
| 297 |
#if UTMP_SUPPORT |
| 298 |
logout (); |
| 299 |
#endif |
| 300 |
put (); |
| 301 |
} |
| 302 |
|
| 303 |
void |
| 304 |
ptytty_unix::put () |
| 305 |
{ |
| 306 |
if (name) |
| 307 |
{ |
| 308 |
chmod (name, RESTORE_TTY_MODE); |
| 309 |
chown (name, 0, ttyconf.gid); |
| 310 |
} |
| 311 |
|
| 312 |
close_tty (); |
| 313 |
|
| 314 |
if (pty >= 0) |
| 315 |
close (pty); |
| 316 |
|
| 317 |
free (name); |
| 318 |
|
| 319 |
pty = tty = -1; |
| 320 |
name = 0; |
| 321 |
} |
| 322 |
|
| 323 |
bool |
| 324 |
ptytty_unix::get () |
| 325 |
{ |
| 326 |
/* get master (pty) */ |
| 327 |
if ((pty = get_pty (&tty, &name)) < 0) |
| 328 |
return false; |
| 329 |
|
| 330 |
/* get slave (tty) */ |
| 331 |
if (tty < 0) |
| 332 |
{ |
| 333 |
#ifndef NO_SETOWNER_TTYDEV |
| 334 |
chown (name, getuid (), ttyconf.gid); /* fail silently */ |
| 335 |
chmod (name, ttyconf.mode); |
| 336 |
# ifdef HAVE_REVOKE |
| 337 |
revoke (name); |
| 338 |
# endif |
| 339 |
#endif |
| 340 |
|
| 341 |
if ((tty = get_tty (name)) < 0) |
| 342 |
{ |
| 343 |
put (); |
| 344 |
return false; |
| 345 |
} |
| 346 |
} |
| 347 |
|
| 348 |
#if defined(I_PUSH) |
| 349 |
/* |
| 350 |
* Push STREAMS modules: |
| 351 |
* ptem: pseudo-terminal hardware emulation module. |
| 352 |
* ldterm: standard terminal line discipline. |
| 353 |
* ttcompat: V7, 4BSD and XENIX STREAMS compatibility module. |
| 354 |
* |
| 355 |
* After we push the STREAMS modules, the first open () on the slave side |
| 356 |
* should make the "ptem" (or "ldterm" depending upon either which OS |
| 357 |
* version or which set of manual pages you have) module give us a |
| 358 |
* controlling terminal. We must already have close ()d the master side |
| 359 |
* fd in this child process before we push STREAMS modules on because the |
| 360 |
* documentation is really unclear about whether it is any close () on |
| 361 |
* the master side or the last close () - i.e. a proper STREAMS dismantling |
| 362 |
* close () - on the master side which causes a hang up to be sent |
| 363 |
* through - Geoff Wing |
| 364 |
*/ |
| 365 |
#if defined(HAVE_ISASTREAM) && defined(HAVE_STROPTS_H) |
| 366 |
if (isastream (tty) == 1) |
| 367 |
# endif |
| 368 |
{ |
| 369 |
ioctl (tty, I_PUSH, "ptem"); |
| 370 |
ioctl (tty, I_PUSH, "ldterm"); |
| 371 |
ioctl (tty, I_PUSH, "ttcompat"); |
| 372 |
} |
| 373 |
#endif |
| 374 |
|
| 375 |
#if UTMP_SUPPORT |
| 376 |
# if defined(HAVE_STRUCT_UTMP) && !defined(HAVE_UTMP_PID) |
| 377 |
int fd_stdin = dup (STDIN_FILENO); |
| 378 |
dup2 (tty, STDIN_FILENO); |
| 379 |
|
| 380 |
utmp_pos = ttyslot (); |
| 381 |
|
| 382 |
dup2 (fd_stdin, STDIN_FILENO); |
| 383 |
close (fd_stdin); |
| 384 |
# endif |
| 385 |
#endif |
| 386 |
|
| 387 |
return true; |
| 388 |
} |
| 389 |
|
