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 |
#if HAVE_STRUCT_UTMP |
53 |
static int write_bsd_utmp (int utmp_pos, struct utmp *wu); |
54 |
static void update_wtmp (const char *fname, const struct utmp *putmp); |
55 |
#endif |
56 |
|
57 |
static void update_lastlog (const char *fname, const char *pty, const char *host); |
58 |
|
59 |
/* |
60 |
* BSD style utmp entry |
61 |
* ut_line, ut_name, ut_host, ut_time |
62 |
* SYSV style utmp (and utmpx) entry |
63 |
* ut_user, ut_id, ut_line, ut_pid, ut_type, ut_exit, ut_time |
64 |
*/ |
65 |
|
66 |
/* ------------------------------------------------------------------------- */ |
67 |
|
68 |
/* |
69 |
* make and write utmp and wtmp entries |
70 |
*/ |
71 |
void |
72 |
ptytty_unix::login (int cmd_pid, bool login_shell, const char *hostname) |
73 |
{ |
74 |
const char *pty = name; |
75 |
|
76 |
if (!pty || !*pty) |
77 |
return; |
78 |
|
79 |
this->cmd_pid = cmd_pid; |
80 |
this->login_shell = login_shell; |
81 |
|
82 |
#ifdef HAVE_STRUCT_UTMP |
83 |
struct utmp *ut = &this->ut; |
84 |
#endif |
85 |
#ifdef HAVE_STRUCT_UTMPX |
86 |
struct utmpx *utx = &this->utx; |
87 |
#endif |
88 |
int i; |
89 |
struct passwd *pwent = getpwuid (getuid ()); |
90 |
|
91 |
if (!strncmp (pty, "/dev/", 5)) |
92 |
pty += 5; /* skip /dev/ prefix */ |
93 |
|
94 |
#if defined(HAVE_UTMP_PID) || defined(HAVE_STRUCT_UTMPX) |
95 |
if (!strncmp (pty, "pty", 3) || !strncmp (pty, "tty", 3)) |
96 |
strncpy (ut_id, pty + 3, sizeof (ut_id)); |
97 |
else if (sscanf (pty, "pts/%d", &i) == 1) |
98 |
sprintf (ut_id, "vt%02x", (i & 0xff)); /* sysv naming */ |
99 |
else if (strncmp (pty, "pty", 3) && strncmp (pty, "tty", 3)) |
100 |
{ |
101 |
ptytty_warn ("can't parse tty name \"%s\", not adding utmp entry.\n", pty); |
102 |
return; |
103 |
} |
104 |
#endif |
105 |
|
106 |
#ifdef HAVE_STRUCT_UTMP |
107 |
memset (ut, 0, sizeof (struct utmp)); |
108 |
# ifdef HAVE_UTMP_PID |
109 |
setutent (); |
110 |
strncpy (ut->ut_id, ut_id, sizeof (ut->ut_id)); |
111 |
ut->ut_type = DEAD_PROCESS; |
112 |
getutid (ut); /* position to entry in utmp file */ |
113 |
strncpy (this->ut_id, ut_id, sizeof (this->ut_id)); |
114 |
# endif |
115 |
#endif |
116 |
|
117 |
#ifdef HAVE_STRUCT_UTMPX |
118 |
memset (utx, 0, sizeof (struct utmpx)); |
119 |
setutxent (); |
120 |
strncpy (utx->ut_id, ut_id, sizeof (utx->ut_id)); |
121 |
utx->ut_type = DEAD_PROCESS; |
122 |
getutxid (utx); /* position to entry in utmp file */ |
123 |
strncpy (this->ut_id, ut_id, sizeof (this->ut_id)); |
124 |
#endif |
125 |
|
126 |
#ifdef HAVE_STRUCT_UTMP |
127 |
strncpy (ut->ut_line, pty, sizeof (ut->ut_line)); |
128 |
ut->ut_time = time (NULL); |
129 |
# ifdef HAVE_UTMP_PID |
130 |
strncpy (ut->ut_user, (pwent && pwent->pw_name) ? pwent->pw_name : "?", |
131 |
sizeof (ut->ut_user)); |
132 |
strncpy (ut->ut_id, ut_id, sizeof (ut->ut_id)); |
133 |
ut->ut_time = time (NULL); |
134 |
ut->ut_pid = cmd_pid; |
135 |
# ifdef HAVE_UTMP_HOST |
136 |
strncpy (ut->ut_host, hostname, sizeof (ut->ut_host)); |
137 |
# endif |
138 |
ut->ut_type = USER_PROCESS; |
139 |
pututline (ut); |
140 |
endutent (); /* close the file */ |
141 |
utmp_pos = 0; |
142 |
# else |
143 |
strncpy (ut->ut_name, (pwent && pwent->pw_name) ? pwent->pw_name : "?", |
144 |
sizeof (ut->ut_name)); |
145 |
# ifdef HAVE_UTMP_HOST |
146 |
strncpy (ut->ut_host, hostname, sizeof (ut->ut_host)); |
147 |
# endif |
148 |
# endif |
149 |
#endif |
150 |
|
151 |
#ifdef HAVE_STRUCT_UTMPX |
152 |
strncpy (utx->ut_line, pty, sizeof (utx->ut_line)); |
153 |
strncpy (utx->ut_user, (pwent && pwent->pw_name) ? pwent->pw_name : "?", |
154 |
sizeof (utx->ut_user)); |
155 |
strncpy (utx->ut_id, ut_id, sizeof (utx->ut_id)); |
156 |
# if HAVE_UTMPX_SESSION |
157 |
utx->ut_session = getsid (0); |
158 |
# endif |
159 |
utx->ut_tv.tv_sec = time (NULL); |
160 |
utx->ut_tv.tv_usec = 0; |
161 |
utx->ut_pid = cmd_pid; |
162 |
# ifdef HAVE_UTMPX_HOST |
163 |
strncpy (utx->ut_host, hostname, sizeof (utx->ut_host)); |
164 |
# if 0 |
165 |
{ |
166 |
char *colon; |
167 |
|
168 |
if ((colon = strrchr (ut->ut_host, ':')) != NULL) |
169 |
*colon = '\0'; |
170 |
} |
171 |
# endif |
172 |
# endif |
173 |
utx->ut_type = USER_PROCESS; |
174 |
pututxline (utx); |
175 |
endutxent (); /* close the file */ |
176 |
utmp_pos = 0; |
177 |
#endif |
178 |
|
179 |
#if defined(HAVE_STRUCT_UTMP) && !defined(HAVE_UTMP_PID) |
180 |
{ |
181 |
# ifdef HAVE_TTYSLOT |
182 |
int fdstdin = dup (STDIN_FILENO); |
183 |
dup2 (tty, STDIN_FILENO); |
184 |
|
185 |
i = ttyslot (); |
186 |
if (write_bsd_utmp (i, ut)) |
187 |
utmp_pos = i; |
188 |
|
189 |
dup2 (fdstdin, STDIN_FILENO); |
190 |
close (fdstdin); |
191 |
# else |
192 |
FILE *fd0; |
193 |
|
194 |
if ((fd0 = fopen (TTYTAB_FILENAME, "r")) != NULL) |
195 |
{ |
196 |
char buf[256], name[256]; |
197 |
|
198 |
buf[sizeof (buf) - 1] = '\0'; |
199 |
for (i = 1; (fgets (buf, sizeof (buf) - 1, fd0) != NULL);) |
200 |
{ |
201 |
if (*buf == '#' || sscanf (buf, "%s", name) != 1) |
202 |
continue; |
203 |
if (!strcmp (ut->ut_line, name)) |
204 |
{ |
205 |
if (!write_bsd_utmp (i, ut)) |
206 |
i = 0; |
207 |
utmp_pos = i; |
208 |
fclose (fd0); |
209 |
break; |
210 |
} |
211 |
i++; |
212 |
} |
213 |
fclose (fd0); |
214 |
} |
215 |
# endif |
216 |
} |
217 |
#endif |
218 |
|
219 |
#ifdef WTMP_SUPPORT |
220 |
#ifdef LOG_ONLY_ON_LOGIN |
221 |
if (login_shell) |
222 |
#endif |
223 |
{ |
224 |
# ifdef HAVE_STRUCT_UTMP |
225 |
# ifdef HAVE_UPDWTMP |
226 |
updwtmp (WTMP_FILE, ut); |
227 |
# else |
228 |
update_wtmp (WTMP_FILE, ut); |
229 |
# endif |
230 |
# endif |
231 |
# if defined(HAVE_STRUCT_UTMPX) && defined(HAVE_UPDWTMPX) |
232 |
updwtmpx (WTMPX_FILE, utx); |
233 |
# endif |
234 |
} |
235 |
#endif |
236 |
#if defined(LASTLOG_SUPPORT) && defined(LASTLOG_FILE) |
237 |
#ifdef LOG_ONLY_ON_LOGIN |
238 |
if (login_shell) |
239 |
#endif |
240 |
update_lastlog (LASTLOG_FILE, pty, hostname); |
241 |
#endif |
242 |
} |
243 |
|
244 |
/* ------------------------------------------------------------------------- */ |
245 |
/* |
246 |
* remove utmp and wtmp entries |
247 |
*/ |
248 |
void |
249 |
ptytty_unix::logout () |
250 |
{ |
251 |
if (!cmd_pid) |
252 |
return; |
253 |
|
254 |
#ifdef HAVE_STRUCT_UTMP |
255 |
struct utmp *tmput, *ut = &this->ut; |
256 |
#endif |
257 |
#ifdef HAVE_STRUCT_UTMPX |
258 |
struct utmpx *tmputx, *utx = &this->utx; |
259 |
#endif |
260 |
|
261 |
#ifdef HAVE_STRUCT_UTMP |
262 |
# ifdef HAVE_UTMP_PID |
263 |
memset (ut, 0, sizeof (struct utmp)); |
264 |
setutent (); |
265 |
strncpy (ut->ut_id, this->ut_id, sizeof (ut->ut_id)); |
266 |
ut->ut_type = USER_PROCESS; |
267 |
if ((tmput = getutid (ut))) /* position to entry in utmp file */ |
268 |
ut = tmput; |
269 |
ut->ut_type = DEAD_PROCESS; |
270 |
# else |
271 |
memset (ut->ut_name, 0, sizeof (ut->ut_name)); |
272 |
# ifdef HAVE_UTMP_HOST |
273 |
memset (ut->ut_host, 0, sizeof (ut->ut_host)); |
274 |
# endif |
275 |
# endif |
276 |
ut->ut_time = time (NULL); |
277 |
#endif |
278 |
|
279 |
#ifdef HAVE_STRUCT_UTMPX |
280 |
memset (utx, 0, sizeof (struct utmpx)); |
281 |
setutxent (); |
282 |
strncpy (utx->ut_id, this->ut_id, sizeof (utx->ut_id)); |
283 |
utx->ut_type = USER_PROCESS; |
284 |
if ((tmputx = getutxid (utx))) /* position to entry in utmp file */ |
285 |
utx = tmputx; |
286 |
utx->ut_type = DEAD_PROCESS; |
287 |
# if HAVE_UTMPX_SESSION |
288 |
utx->ut_session = getsid (0); |
289 |
# endif |
290 |
utx->ut_tv.tv_sec = time (NULL); |
291 |
utx->ut_tv.tv_usec = 0; |
292 |
#endif |
293 |
|
294 |
/* |
295 |
* Write ending wtmp entry |
296 |
*/ |
297 |
#ifdef WTMP_SUPPORT |
298 |
#ifdef LOG_ONLY_ON_LOGIN |
299 |
if (login_shell) |
300 |
#endif |
301 |
{ |
302 |
# ifdef HAVE_STRUCT_UTMP |
303 |
# ifdef HAVE_UPDWTMP |
304 |
updwtmp (WTMP_FILE, ut); |
305 |
# else |
306 |
update_wtmp (WTMP_FILE, ut); |
307 |
# endif |
308 |
# endif |
309 |
# if defined(HAVE_STRUCT_UTMPX) && defined(HAVE_UPDWTMPX) |
310 |
updwtmpx (WTMPX_FILE, utx); |
311 |
# endif |
312 |
} |
313 |
#endif |
314 |
|
315 |
/* |
316 |
* Write utmp entry |
317 |
*/ |
318 |
#ifdef HAVE_STRUCT_UTMP |
319 |
# ifdef HAVE_UTMP_PID |
320 |
if (ut->ut_pid == cmd_pid) |
321 |
pututline (ut); |
322 |
endutent (); |
323 |
# else |
324 |
memset (ut, 0, sizeof (struct utmp)); |
325 |
write_bsd_utmp (utmp_pos, ut); |
326 |
# endif |
327 |
#endif |
328 |
#ifdef HAVE_STRUCT_UTMPX |
329 |
if (utx->ut_pid == cmd_pid) |
330 |
pututxline (utx); |
331 |
endutxent (); |
332 |
#endif |
333 |
|
334 |
cmd_pid = 0; |
335 |
} |
336 |
|
337 |
/* ------------------------------------------------------------------------- */ |
338 |
/* |
339 |
* Write a BSD style utmp entry |
340 |
*/ |
341 |
#if defined(HAVE_STRUCT_UTMP) && !defined(HAVE_UTMP_PID) |
342 |
static int |
343 |
write_bsd_utmp (int utmp_pos, struct utmp *wu) |
344 |
{ |
345 |
int fd; |
346 |
|
347 |
if (utmp_pos <= 0 || (fd = open (UTMP_FILE, O_WRONLY)) == -1) |
348 |
return 0; |
349 |
|
350 |
if (lseek (fd, (off_t) (utmp_pos * sizeof (struct utmp)), SEEK_SET) != -1) |
351 |
write (fd, wu, sizeof (struct utmp)); |
352 |
close (fd); |
353 |
return 1; |
354 |
} |
355 |
#endif |
356 |
|
357 |
/* ------------------------------------------------------------------------- */ |
358 |
/* |
359 |
* Update a BSD style wtmp entry |
360 |
*/ |
361 |
#if defined(WTMP_SUPPORT) && !defined(HAVE_UPDWTMP) && defined(HAVE_STRUCT_UTMP) |
362 |
static void |
363 |
update_wtmp (const char *fname, const struct utmp *putmp) |
364 |
{ |
365 |
int fd, gotlock, retry; |
366 |
struct flock lck; /* fcntl locking scheme */ |
367 |
struct stat sbuf; |
368 |
|
369 |
if ((fd = open (fname, O_WRONLY | O_APPEND, 0)) < 0) |
370 |
return; |
371 |
|
372 |
lck.l_whence = SEEK_END; /* start lock at current eof */ |
373 |
lck.l_len = 0; /* end at ``largest possible eof'' */ |
374 |
lck.l_start = 0; |
375 |
lck.l_type = F_WRLCK; /* we want a write lock */ |
376 |
|
377 |
/* attempt lock with F_SETLK; F_SETLKW would cause a deadlock! */ |
378 |
for (retry = 10, gotlock = 0; retry--;) |
379 |
if (fcntl (fd, F_SETLK, &lck) != -1) |
380 |
{ |
381 |
gotlock = 1; |
382 |
break; |
383 |
} |
384 |
else if (errno != EAGAIN && errno != EACCES) |
385 |
break; |
386 |
if (!gotlock) |
387 |
{ /* give it up */ |
388 |
close (fd); |
389 |
return; |
390 |
} |
391 |
if (fstat (fd, &sbuf) == 0) |
392 |
if (write (fd, putmp, sizeof (struct utmp)) != sizeof (struct utmp)) |
393 |
ftruncate (fd, sbuf.st_size); /* remove bad writes */ |
394 |
|
395 |
lck.l_type = F_UNLCK; /* unlocking the file */ |
396 |
fcntl (fd, F_SETLK, &lck); |
397 |
close (fd); |
398 |
} |
399 |
#endif |
400 |
|
401 |
/* ------------------------------------------------------------------------- */ |
402 |
#ifdef LASTLOG_SUPPORT |
403 |
static void |
404 |
update_lastlog (const char *fname, const char *pty, const char *host) |
405 |
{ |
406 |
# ifdef HAVE_STRUCT_LASTLOGX |
407 |
struct lastlogx llx; |
408 |
# endif |
409 |
# ifdef HAVE_STRUCT_LASTLOG |
410 |
int fd; |
411 |
struct lastlog ll; |
412 |
# ifdef LASTLOG_IS_DIR |
413 |
char lastlogfile[256]; |
414 |
# endif |
415 |
struct passwd *pwent; |
416 |
# endif |
417 |
|
418 |
# ifdef HAVE_STRUCT_LASTLOGX |
419 |
memset (&llx, 0, sizeof (llx)); |
420 |
llx.ll_tv.tv_sec = time (NULL); |
421 |
llx.ll_tv.tv_usec = 0; |
422 |
strncpy (llx.ll_line, pty, sizeof (llx.ll_line)); |
423 |
strncpy (llx.ll_host, host, sizeof (llx.ll_host)); |
424 |
updlastlogx (LASTLOGX_FILE, getuid (), &llx); |
425 |
# endif |
426 |
|
427 |
# ifdef HAVE_STRUCT_LASTLOG |
428 |
pwent = getpwuid (getuid ()); |
429 |
if (!pwent) |
430 |
{ |
431 |
ptytty_warn ("no entry in password file, not updating lastlog.\n", 0); |
432 |
return; |
433 |
} |
434 |
|
435 |
memset (&ll, 0, sizeof (ll)); |
436 |
ll.ll_time = time (NULL); |
437 |
strncpy (ll.ll_line, pty, sizeof (ll.ll_line)); |
438 |
strncpy (ll.ll_host, host, sizeof (ll.ll_host)); |
439 |
# ifdef LASTLOG_IS_DIR |
440 |
sprintf (lastlogfile, "%.*s/%.*s", |
441 |
sizeof (lastlogfile) - sizeof (pwent->pw_name) - 2, fname, |
442 |
sizeof (pwent->pw_name), |
443 |
(!pwent->pw_name || pwent->pw_name[0] == '\0') ? "unknown" |
444 |
: pwent->pw_name); |
445 |
if ((fd = open (lastlogfile, O_WRONLY | O_CREAT, 0644)) >= 0) |
446 |
{ |
447 |
write (fd, &ll, sizeof (ll)); |
448 |
close (fd); |
449 |
} |
450 |
# else |
451 |
if ((fd = open (fname, O_RDWR)) != -1) |
452 |
{ |
453 |
if (lseek (fd, (off_t) ((long)pwent->pw_uid * sizeof (ll)), |
454 |
SEEK_SET) != -1) |
455 |
write (fd, &ll, sizeof (ll)); |
456 |
close (fd); |
457 |
} |
458 |
# endif /* LASTLOG_IS_DIR */ |
459 |
# endif /* HAVE_STRUCT_LASTLOG */ |
460 |
} |
461 |
#endif /* LASTLOG_SUPPORT */ |
462 |
|
463 |
#else |
464 |
void |
465 |
ptytty_unix::login (int cmd_pid, bool login_shell, const char *hostname) |
466 |
{ |
467 |
} |
468 |
#endif |
469 |
|