| 1 |
// This file is part of libptytty. Do not make local modifications. |
| 2 |
// http://software.schmorp.de/pkg/libptytty |
| 3 |
|
| 4 |
/*----------------------------------------------------------------------* |
| 5 |
* File: logging.C |
| 6 |
*----------------------------------------------------------------------* |
| 7 |
* |
| 8 |
* All portions of code are copyright by their respective author/s. |
| 9 |
* Copyright (c) 1992 John Bovey <jdb@ukc.ac.uk> |
| 10 |
* - original version |
| 11 |
* Copyright (c) 1993 lipka |
| 12 |
* Copyright (c) 1993 Brian Stempien <stempien@cs.wmich.edu> |
| 13 |
* Copyright (c) 1995 Raul Garcia Garcia <rgg@tid.es> |
| 14 |
* Copyright (c) 1995 Piet W. Plomp <piet@idefix.icce.rug.nl> |
| 15 |
* Copyright (c) 1997 Raul Garcia Garcia <rgg@tid.es> |
| 16 |
* Copyright (c) 1998-2001 Geoff Wing <gcw@pobox.com> |
| 17 |
* - extensive modifications |
| 18 |
* Copyright (c) 1999 D J Hawkey Jr <hawkeyd@visi.com> |
| 19 |
* - lastlog support |
| 20 |
* Copyright (c) 2004-2006 Marc Lehmann <pcg@goof.com> |
| 21 |
* Copyright (c) 2006 Emanuele Giaquinta <e.giaquinta@glauco.it> |
| 22 |
* |
| 23 |
* This program is free software; you can redistribute it and/or modify |
| 24 |
* it under the terms of the GNU General Public License as published by |
| 25 |
* the Free Software Foundation; either version 2 of the License, or |
| 26 |
* (at your option) any later version. |
| 27 |
* |
| 28 |
* This program is distributed in the hope that it will be useful, |
| 29 |
* but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 30 |
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 31 |
* GNU General Public License for more details. |
| 32 |
* |
| 33 |
* You should have received a copy of the GNU General Public License |
| 34 |
* along with this program; if not, write to the Free Software |
| 35 |
* Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. |
| 36 |
*----------------------------------------------------------------------*/ |
| 37 |
|
| 38 |
#include "../config.h" |
| 39 |
|
| 40 |
#include "ptytty.h" |
| 41 |
|
| 42 |
#if UTMP_SUPPORT |
| 43 |
|
| 44 |
#include <cstdio> |
| 45 |
|
| 46 |
#include <sys/types.h> |
| 47 |
#include <sys/stat.h> |
| 48 |
#include <sys/fcntl.h> |
| 49 |
#include <unistd.h> |
| 50 |
#include <time.h> |
| 51 |
|
| 52 |
/* |
| 53 |
* BSD style utmp entry |
| 54 |
* ut_line, ut_name, ut_host, ut_time |
| 55 |
* SYSV style utmp (and utmpx) entry |
| 56 |
* ut_user, ut_id, ut_line, ut_pid, ut_type, ut_exit, ut_time |
| 57 |
*/ |
| 58 |
|
| 59 |
/* ------------------------------------------------------------------------- */ |
| 60 |
/* |
| 61 |
* Write a BSD style utmp entry |
| 62 |
*/ |
| 63 |
#if defined(HAVE_STRUCT_UTMP) && !defined(HAVE_UTMP_PID) |
| 64 |
static int |
| 65 |
write_bsd_utmp (int utmp_pos, struct utmp *wu) |
| 66 |
{ |
| 67 |
int fd; |
| 68 |
|
| 69 |
if (utmp_pos <= 0 || (fd = open (UTMP_FILE, O_WRONLY)) == -1) |
| 70 |
return 0; |
| 71 |
|
| 72 |
if (lseek (fd, (off_t) (utmp_pos * sizeof (struct utmp)), SEEK_SET) != -1) |
| 73 |
write (fd, wu, sizeof (struct utmp)); |
| 74 |
close (fd); |
| 75 |
return 1; |
| 76 |
} |
| 77 |
#endif |
| 78 |
|
| 79 |
/* ------------------------------------------------------------------------- */ |
| 80 |
/* |
| 81 |
* Update a BSD style wtmp entry |
| 82 |
*/ |
| 83 |
#if defined(WTMP_SUPPORT) && !defined(HAVE_UPDWTMP) && defined(HAVE_STRUCT_UTMP) |
| 84 |
static void |
| 85 |
update_wtmp (const char *fname, const struct utmp *putmp) |
| 86 |
{ |
| 87 |
int fd, gotlock, retry; |
| 88 |
struct flock lck; /* fcntl locking scheme */ |
| 89 |
struct stat sbuf; |
| 90 |
|
| 91 |
if ((fd = open (fname, O_WRONLY | O_APPEND, 0)) < 0) |
| 92 |
return; |
| 93 |
|
| 94 |
lck.l_whence = SEEK_END; /* start lock at current eof */ |
| 95 |
lck.l_len = 0; /* end at ``largest possible eof'' */ |
| 96 |
lck.l_start = 0; |
| 97 |
lck.l_type = F_WRLCK; /* we want a write lock */ |
| 98 |
|
| 99 |
/* attempt lock with F_SETLK; F_SETLKW would cause a deadlock! */ |
| 100 |
for (retry = 10, gotlock = 0; retry--;) |
| 101 |
if (fcntl (fd, F_SETLK, &lck) != -1) |
| 102 |
{ |
| 103 |
gotlock = 1; |
| 104 |
break; |
| 105 |
} |
| 106 |
else if (errno != EAGAIN && errno != EACCES) |
| 107 |
break; |
| 108 |
if (!gotlock) |
| 109 |
{ /* give it up */ |
| 110 |
close (fd); |
| 111 |
return; |
| 112 |
} |
| 113 |
if (fstat (fd, &sbuf) == 0) |
| 114 |
if (write (fd, putmp, sizeof (struct utmp)) != sizeof (struct utmp)) |
| 115 |
ftruncate (fd, sbuf.st_size); /* remove bad writes */ |
| 116 |
|
| 117 |
lck.l_type = F_UNLCK; /* unlocking the file */ |
| 118 |
fcntl (fd, F_SETLK, &lck); |
| 119 |
close (fd); |
| 120 |
} |
| 121 |
#endif |
| 122 |
|
| 123 |
/* ------------------------------------------------------------------------- */ |
| 124 |
#ifdef LASTLOG_SUPPORT |
| 125 |
static void |
| 126 |
update_lastlog (const char *fname, const char *pty, const char *host) |
| 127 |
{ |
| 128 |
# if defined(HAVE_STRUCT_LASTLOGX) && defined(HAVE_UPDLASTLOGX) |
| 129 |
struct lastlogx llx; |
| 130 |
# endif |
| 131 |
# ifdef HAVE_STRUCT_LASTLOG |
| 132 |
int fd; |
| 133 |
struct lastlog ll; |
| 134 |
char lastlogfile[256]; |
| 135 |
struct passwd *pwent; |
| 136 |
struct stat st; |
| 137 |
# endif |
| 138 |
|
| 139 |
# if defined(HAVE_STRUCT_LASTLOGX) && defined(HAVE_UPDLASTLOGX) |
| 140 |
memset (&llx, 0, sizeof (llx)); |
| 141 |
llx.ll_tv.tv_sec = time (NULL); |
| 142 |
llx.ll_tv.tv_usec = 0; |
| 143 |
strncpy (llx.ll_line, pty, sizeof (llx.ll_line)); |
| 144 |
strncpy (llx.ll_host, host, sizeof (llx.ll_host)); |
| 145 |
updlastlogx (LASTLOGX_FILE, getuid (), &llx); |
| 146 |
# endif |
| 147 |
|
| 148 |
# ifdef HAVE_STRUCT_LASTLOG |
| 149 |
pwent = getpwuid (getuid ()); |
| 150 |
if (!pwent) |
| 151 |
{ |
| 152 |
ptytty_warn ("no entry in password file, not updating lastlog.\n", 0); |
| 153 |
return; |
| 154 |
} |
| 155 |
|
| 156 |
memset (&ll, 0, sizeof (ll)); |
| 157 |
ll.ll_time = time (NULL); |
| 158 |
strncpy (ll.ll_line, pty, sizeof (ll.ll_line)); |
| 159 |
strncpy (ll.ll_host, host, sizeof (ll.ll_host)); |
| 160 |
if (stat (fname, &st) != 0) |
| 161 |
return; |
| 162 |
if (S_ISDIR (st.st_mode)) |
| 163 |
{ |
| 164 |
sprintf (lastlogfile, "%.*s/%.*s", |
| 165 |
(int)(sizeof (lastlogfile) - sizeof (pwent->pw_name) - 2), fname, |
| 166 |
(int)sizeof (pwent->pw_name), |
| 167 |
(!pwent->pw_name || pwent->pw_name[0] == '\0') ? "unknown" |
| 168 |
: pwent->pw_name); |
| 169 |
if ((fd = open (lastlogfile, O_WRONLY | O_CREAT, 0644)) >= 0) |
| 170 |
{ |
| 171 |
write (fd, &ll, sizeof (ll)); |
| 172 |
close (fd); |
| 173 |
} |
| 174 |
} |
| 175 |
else if (S_ISREG (st.st_mode)) |
| 176 |
if ((fd = open (fname, O_RDWR)) != -1) |
| 177 |
{ |
| 178 |
if (lseek (fd, (off_t) ((long)pwent->pw_uid * sizeof (ll)), |
| 179 |
SEEK_SET) != -1) |
| 180 |
write (fd, &ll, sizeof (ll)); |
| 181 |
close (fd); |
| 182 |
} |
| 183 |
# endif /* HAVE_STRUCT_LASTLOG */ |
| 184 |
} |
| 185 |
#endif /* LASTLOG_SUPPORT */ |
| 186 |
|
| 187 |
/* ------------------------------------------------------------------------- */ |
| 188 |
|
| 189 |
/* |
| 190 |
* make and write utmp and wtmp entries |
| 191 |
*/ |
| 192 |
void |
| 193 |
ptytty_unix::login (int cmd_pid, bool login_shell, const char *hostname) |
| 194 |
{ |
| 195 |
const char *pty = name; |
| 196 |
|
| 197 |
if (!pty || !*pty) |
| 198 |
return; |
| 199 |
|
| 200 |
this->cmd_pid = cmd_pid; |
| 201 |
this->login_shell = login_shell; |
| 202 |
|
| 203 |
#ifdef HAVE_STRUCT_UTMP |
| 204 |
struct utmp *ut = &this->ut; |
| 205 |
#endif |
| 206 |
#ifdef HAVE_STRUCT_UTMPX |
| 207 |
struct utmpx *utx = &this->utx; |
| 208 |
#endif |
| 209 |
int i; |
| 210 |
struct passwd *pwent = getpwuid (getuid ()); |
| 211 |
const char *name = (pwent && pwent->pw_name) ? pwent->pw_name : "?"; |
| 212 |
|
| 213 |
if (!strncmp (pty, "/dev/", 5)) |
| 214 |
pty += 5; /* skip /dev/ prefix */ |
| 215 |
|
| 216 |
#if defined(HAVE_UTMP_PID) || defined(HAVE_STRUCT_UTMPX) |
| 217 |
if (!strncmp (pty, "pty", 3) || !strncmp (pty, "tty", 3)) |
| 218 |
strncpy (ut_id, pty + 3, sizeof (ut_id)); |
| 219 |
else if (sscanf (pty, "pts/%d", &i) == 1) |
| 220 |
sprintf (ut_id, "vt%02x", (i & 0xff)); /* sysv naming */ |
| 221 |
else if (strncmp (pty, "pty", 3) && strncmp (pty, "tty", 3)) |
| 222 |
{ |
| 223 |
ptytty_warn ("can't parse tty name \"%s\", not adding utmp entry.\n", pty); |
| 224 |
return; |
| 225 |
} |
| 226 |
#endif |
| 227 |
|
| 228 |
#ifdef HAVE_STRUCT_UTMP |
| 229 |
memset (ut, 0, sizeof (struct utmp)); |
| 230 |
# ifdef HAVE_UTMP_PID |
| 231 |
setutent (); |
| 232 |
strncpy (ut->ut_id, ut_id, sizeof (ut->ut_id)); |
| 233 |
ut->ut_type = DEAD_PROCESS; |
| 234 |
getutid (ut); /* position to entry in utmp file */ |
| 235 |
strncpy (this->ut_id, ut_id, sizeof (this->ut_id)); |
| 236 |
# endif |
| 237 |
#endif |
| 238 |
|
| 239 |
#ifdef HAVE_STRUCT_UTMPX |
| 240 |
memset (utx, 0, sizeof (struct utmpx)); |
| 241 |
setutxent (); |
| 242 |
strncpy (utx->ut_id, ut_id, sizeof (utx->ut_id)); |
| 243 |
utx->ut_type = DEAD_PROCESS; |
| 244 |
getutxid (utx); /* position to entry in utmp file */ |
| 245 |
strncpy (this->ut_id, ut_id, sizeof (this->ut_id)); |
| 246 |
#endif |
| 247 |
|
| 248 |
#ifdef HAVE_STRUCT_UTMP |
| 249 |
strncpy (ut->ut_line, pty, sizeof (ut->ut_line)); |
| 250 |
ut->ut_time = time (NULL); |
| 251 |
# ifdef HAVE_UTMP_PID |
| 252 |
strncpy (ut->ut_user, name, sizeof (ut->ut_user)); |
| 253 |
strncpy (ut->ut_id, ut_id, sizeof (ut->ut_id)); |
| 254 |
ut->ut_time = time (NULL); |
| 255 |
ut->ut_pid = cmd_pid; |
| 256 |
# ifdef HAVE_UTMP_HOST |
| 257 |
strncpy (ut->ut_host, hostname, sizeof (ut->ut_host)); |
| 258 |
# endif |
| 259 |
ut->ut_type = USER_PROCESS; |
| 260 |
pututline (ut); |
| 261 |
endutent (); /* close the file */ |
| 262 |
utmp_pos = 0; |
| 263 |
# else |
| 264 |
strncpy (ut->ut_name, name, sizeof (ut->ut_name)); |
| 265 |
# ifdef HAVE_UTMP_HOST |
| 266 |
strncpy (ut->ut_host, hostname, sizeof (ut->ut_host)); |
| 267 |
# endif |
| 268 |
# endif |
| 269 |
#endif |
| 270 |
|
| 271 |
#ifdef HAVE_STRUCT_UTMPX |
| 272 |
strncpy (utx->ut_line, pty, sizeof (utx->ut_line)); |
| 273 |
strncpy (utx->ut_user, name, sizeof (utx->ut_user)); |
| 274 |
strncpy (utx->ut_id, ut_id, sizeof (utx->ut_id)); |
| 275 |
# if HAVE_UTMPX_SESSION |
| 276 |
utx->ut_session = getsid (0); |
| 277 |
# endif |
| 278 |
utx->ut_tv.tv_sec = time (NULL); |
| 279 |
utx->ut_tv.tv_usec = 0; |
| 280 |
utx->ut_pid = cmd_pid; |
| 281 |
# ifdef HAVE_UTMPX_HOST |
| 282 |
strncpy (utx->ut_host, hostname, sizeof (utx->ut_host)); |
| 283 |
# if 0 |
| 284 |
{ |
| 285 |
char *colon; |
| 286 |
|
| 287 |
if ((colon = strrchr (ut->ut_host, ':')) != NULL) |
| 288 |
*colon = '\0'; |
| 289 |
} |
| 290 |
# endif |
| 291 |
# endif |
| 292 |
utx->ut_type = USER_PROCESS; |
| 293 |
pututxline (utx); |
| 294 |
endutxent (); /* close the file */ |
| 295 |
utmp_pos = 0; |
| 296 |
#endif |
| 297 |
|
| 298 |
#if defined(HAVE_STRUCT_UTMP) && !defined(HAVE_UTMP_PID) |
| 299 |
{ |
| 300 |
# if 1 |
| 301 |
int fdstdin = dup (STDIN_FILENO); |
| 302 |
dup2 (tty, STDIN_FILENO); |
| 303 |
|
| 304 |
i = ttyslot (); |
| 305 |
if (write_bsd_utmp (i, ut)) |
| 306 |
utmp_pos = i; |
| 307 |
|
| 308 |
dup2 (fdstdin, STDIN_FILENO); |
| 309 |
close (fdstdin); |
| 310 |
# endif |
| 311 |
} |
| 312 |
#endif |
| 313 |
|
| 314 |
#ifdef WTMP_SUPPORT |
| 315 |
#ifdef LOG_ONLY_ON_LOGIN |
| 316 |
if (login_shell) |
| 317 |
#endif |
| 318 |
{ |
| 319 |
# ifdef HAVE_STRUCT_UTMP |
| 320 |
# ifdef HAVE_UPDWTMP |
| 321 |
updwtmp (WTMP_FILE, ut); |
| 322 |
# else |
| 323 |
update_wtmp (WTMP_FILE, ut); |
| 324 |
# endif |
| 325 |
# endif |
| 326 |
# if defined(HAVE_STRUCT_UTMPX) && defined(HAVE_UPDWTMPX) |
| 327 |
updwtmpx (WTMPX_FILE, utx); |
| 328 |
# endif |
| 329 |
} |
| 330 |
#endif |
| 331 |
#if defined(LASTLOG_SUPPORT) && defined(LASTLOG_FILE) |
| 332 |
#ifdef LOG_ONLY_ON_LOGIN |
| 333 |
if (login_shell) |
| 334 |
#endif |
| 335 |
update_lastlog (LASTLOG_FILE, pty, hostname); |
| 336 |
#endif |
| 337 |
} |
| 338 |
|
| 339 |
/* ------------------------------------------------------------------------- */ |
| 340 |
/* |
| 341 |
* remove utmp and wtmp entries |
| 342 |
*/ |
| 343 |
void |
| 344 |
ptytty_unix::logout () |
| 345 |
{ |
| 346 |
if (!cmd_pid) |
| 347 |
return; |
| 348 |
|
| 349 |
#ifdef HAVE_STRUCT_UTMP |
| 350 |
struct utmp *tmput, *ut = &this->ut; |
| 351 |
#endif |
| 352 |
#ifdef HAVE_STRUCT_UTMPX |
| 353 |
struct utmpx *tmputx, *utx = &this->utx; |
| 354 |
#endif |
| 355 |
|
| 356 |
#ifdef HAVE_STRUCT_UTMP |
| 357 |
# ifdef HAVE_UTMP_PID |
| 358 |
memset (ut, 0, sizeof (struct utmp)); |
| 359 |
setutent (); |
| 360 |
strncpy (ut->ut_id, this->ut_id, sizeof (ut->ut_id)); |
| 361 |
ut->ut_type = USER_PROCESS; |
| 362 |
if ((tmput = getutid (ut))) /* position to entry in utmp file */ |
| 363 |
ut = tmput; |
| 364 |
ut->ut_type = DEAD_PROCESS; |
| 365 |
# else |
| 366 |
memset (ut->ut_name, 0, sizeof (ut->ut_name)); |
| 367 |
# ifdef HAVE_UTMP_HOST |
| 368 |
memset (ut->ut_host, 0, sizeof (ut->ut_host)); |
| 369 |
# endif |
| 370 |
# endif |
| 371 |
ut->ut_time = time (NULL); |
| 372 |
#endif |
| 373 |
|
| 374 |
#ifdef HAVE_STRUCT_UTMPX |
| 375 |
memset (utx, 0, sizeof (struct utmpx)); |
| 376 |
setutxent (); |
| 377 |
strncpy (utx->ut_id, this->ut_id, sizeof (utx->ut_id)); |
| 378 |
utx->ut_type = USER_PROCESS; |
| 379 |
if ((tmputx = getutxid (utx))) /* position to entry in utmp file */ |
| 380 |
utx = tmputx; |
| 381 |
utx->ut_type = DEAD_PROCESS; |
| 382 |
# if HAVE_UTMPX_SESSION |
| 383 |
utx->ut_session = getsid (0); |
| 384 |
# endif |
| 385 |
utx->ut_tv.tv_sec = time (NULL); |
| 386 |
utx->ut_tv.tv_usec = 0; |
| 387 |
#endif |
| 388 |
|
| 389 |
/* |
| 390 |
* Write ending wtmp entry |
| 391 |
*/ |
| 392 |
#ifdef WTMP_SUPPORT |
| 393 |
#ifdef LOG_ONLY_ON_LOGIN |
| 394 |
if (login_shell) |
| 395 |
#endif |
| 396 |
{ |
| 397 |
# ifdef HAVE_STRUCT_UTMP |
| 398 |
# ifdef HAVE_UPDWTMP |
| 399 |
updwtmp (WTMP_FILE, ut); |
| 400 |
# else |
| 401 |
update_wtmp (WTMP_FILE, ut); |
| 402 |
# endif |
| 403 |
# endif |
| 404 |
# if defined(HAVE_STRUCT_UTMPX) && defined(HAVE_UPDWTMPX) |
| 405 |
updwtmpx (WTMPX_FILE, utx); |
| 406 |
# endif |
| 407 |
} |
| 408 |
#endif |
| 409 |
|
| 410 |
/* |
| 411 |
* Write utmp entry |
| 412 |
*/ |
| 413 |
#ifdef HAVE_STRUCT_UTMP |
| 414 |
# ifdef HAVE_UTMP_PID |
| 415 |
if (ut->ut_pid == cmd_pid) |
| 416 |
pututline (ut); |
| 417 |
endutent (); |
| 418 |
# else |
| 419 |
memset (ut, 0, sizeof (struct utmp)); |
| 420 |
write_bsd_utmp (utmp_pos, ut); |
| 421 |
# endif |
| 422 |
#endif |
| 423 |
#ifdef HAVE_STRUCT_UTMPX |
| 424 |
if (utx->ut_pid == cmd_pid) |
| 425 |
pututxline (utx); |
| 426 |
endutxent (); |
| 427 |
#endif |
| 428 |
|
| 429 |
cmd_pid = 0; |
| 430 |
} |
| 431 |
|
| 432 |
#else |
| 433 |
void |
| 434 |
ptytty_unix::login (int cmd_pid, bool login_shell, const char *hostname) |
| 435 |
{ |
| 436 |
} |
| 437 |
#endif |
| 438 |
|
