1 /*
2 * Copyright (c) 2000 Andre Lucas. All rights reserved.
3 * Portions copyright (c) 1998 Todd C. Miller
4 * Portions copyright (c) 1996 Jason Downs
5 * Portions copyright (c) 1996 Theo de Raadt
6 *
7 * Redistribution and use in source and binary forms, with or without
8 * modification, are permitted provided that the following conditions
9 * are met:
10 * 1. Redistributions of source code must retain the above copyright
11 * notice, this list of conditions and the following disclaimer.
12 * 2. Redistributions in binary form must reproduce the above copyright
13 * notice, this list of conditions and the following disclaimer in the
14 * documentation and/or other materials provided with the distribution.
15 * 3. All advertising materials mentioning features or use of this software
16 * must display the following acknowledgement:
17 * This product includes software developed by Markus Friedl.
18 * 4. The name of the author may not be used to endorse or promote products
19 * derived from this software without specific prior written permission.
20 *
21 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
22 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
23 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
24 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
25 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
26 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
27 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
28 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
29 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
30 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
31 */
32 /*
33 * Copyright 2009 Sun Microsystems, Inc. All rights reserved.
34 * Use is subject to license terms.
35 */
36
37 /**
38 ** loginrec.c: platform-independent login recording and lastlog retrieval
39 **/
40
41 /*
42 The new login code explained
43 ============================
44
45 This code attempts to provide a common interface to login recording
46 (utmp and friends) and last login time retrieval.
47
48 Its primary means of achieving this is to use 'struct logininfo', a
49 union of all the useful fields in the various different types of
50 system login record structures one finds on UNIX variants.
51
52 We depend on autoconf to define which recording methods are to be
53 used, and which fields are contained in the relevant data structures
54 on the local system. Many C preprocessor symbols affect which code
55 gets compiled here.
56
57 The code is designed to make it easy to modify a particular
58 recording method, without affecting other methods nor requiring so
59 many nested conditional compilation blocks as were commonplace in
60 the old code.
61
62 For login recording, we try to use the local system's libraries as
63 these are clearly most likely to work correctly. For utmp systems
64 this usually means login() and logout() or setutent() etc., probably
65 in libutil, along with logwtmp() etc. On these systems, we fall back
66 to writing the files directly if we have to, though this method
67 requires very thorough testing so we do not corrupt local auditing
68 information. These files and their access methods are very system
69 specific indeed.
70
71 For utmpx systems, the corresponding library functions are
72 setutxent() etc. To the author's knowledge, all utmpx systems have
73 these library functions and so no direct write is attempted. If such
74 a system exists and needs support, direct analogues of the [uw]tmp
75 code should suffice.
76
77 Retrieving the time of last login ('lastlog') is in some ways even
78 more problemmatic than login recording. Some systems provide a
79 simple table of all users which we seek based on uid and retrieve a
80 relatively standard structure. Others record the same information in
81 a directory with a separate file, and others don't record the
82 information separately at all. For systems in the latter category,
83 we look backwards in the wtmp or wtmpx file for the last login entry
84 for our user. Naturally this is slower and on busy systems could
85 incur a significant performance penalty.
86
87 Calling the new code
88 --------------------
89
90 In OpenSSH all login recording and retrieval is performed in
91 login.c. Here you'll find working examples. Also, in the logintest.c
92 program there are more examples.
93
94 Internal handler calling method
95 -------------------------------
96
97 When a call is made to login_login() or login_logout(), both
98 routines set a struct logininfo flag defining which action (log in,
99 or log out) is to be taken. They both then call login_write(), which
100 calls whichever of the many structure-specific handlers autoconf
101 selects for the local system.
102
103 The handlers themselves handle system data structure specifics. Both
104 struct utmp and struct utmpx have utility functions (see
105 construct_utmp*()) to try to make it simpler to add extra systems
106 that introduce new features to either structure.
107
108 While it may seem terribly wasteful to replicate so much similar
109 code for each method, experience has shown that maintaining code to
110 write both struct utmp and utmpx in one function, whilst maintaining
111 support for all systems whether they have library support or not, is
112 a difficult and time-consuming task.
113
114 Lastlog support proceeds similarly. Functions login_get_lastlog()
115 (and its OpenSSH-tuned friend login_get_lastlog_time()) call
116 getlast_entry(), which tries one of three methods to find the last
117 login time. It uses local system lastlog support if it can,
118 otherwise it tries wtmp or wtmpx before giving up and returning 0,
119 meaning "tilt".
120
121 Maintenance
122 -----------
123
124 In many cases it's possible to tweak autoconf to select the correct
125 methods for a particular platform, either by improving the detection
126 code (best), or by presetting DISABLE_<method> or CONF_<method>_FILE
127 symbols for the platform.
128
129 Use logintest to check which symbols are defined before modifying
130 configure.ac and loginrec.c. (You have to build logintest yourself
131 with 'make logintest' as it's not built by default.)
132
133 Otherwise, patches to the specific method(s) are very helpful!
134
135 */
136
137 /**
138 ** TODO:
139 ** homegrown ttyslot()
140 ** test, test, test
141 **
142 ** Platform status:
143 ** ----------------
144 **
145 ** Known good:
146 ** Linux (Redhat 6.2, Debian)
147 ** Solaris
148 ** HP-UX 10.20 (gcc only)
149 ** IRIX
150 ** NeXT - M68k/HPPA/Sparc (4.2/3.3)
151 **
152 ** Testing required: Please send reports!
153 ** NetBSD
154 ** HP-UX 11
155 ** AIX
156 **
157 ** Platforms with known problems:
158 ** Some variants of Slackware Linux
159 **
160 **/
161
162 #include "includes.h"
163
164 #include "ssh.h"
165 #include "xmalloc.h"
166 #include "loginrec.h"
167 #include "log.h"
168 #include "atomicio.h"
169
170 RCSID("$Id: loginrec.c,v 1.44 2002/09/26 00:38:49 tim Exp $");
171
172 #ifdef HAVE_UTIL_H
173 # include <util.h>
174 #endif
175
176 #ifdef HAVE_LIBUTIL_H
177 # include <libutil.h>
178 #endif
179
180 /**
181 ** prototypes for helper functions in this file
182 **/
183
184 #if HAVE_UTMP_H
185 void set_utmp_time(struct logininfo *li, struct utmp *ut);
186 void construct_utmp(struct logininfo *li, struct utmp *ut);
187 #endif
188
189 #ifdef HAVE_UTMPX_H
190 void set_utmpx_time(struct logininfo *li, struct utmpx *ut);
191 void construct_utmpx(struct logininfo *li, struct utmpx *ut);
192 #endif
193
194 int utmp_write_entry(struct logininfo *li);
195 int utmpx_write_entry(struct logininfo *li);
196 int wtmp_write_entry(struct logininfo *li);
197 int wtmpx_write_entry(struct logininfo *li);
198 int lastlog_write_entry(struct logininfo *li);
199 int syslogin_write_entry(struct logininfo *li);
200
201 int getlast_entry(struct logininfo *li);
202 int lastlog_get_entry(struct logininfo *li);
203 int wtmp_get_entry(struct logininfo *li);
204 int wtmpx_get_entry(struct logininfo *li);
205
206 /* pick the shortest string */
207 #define MIN_SIZEOF(s1,s2) ( sizeof(s1) < sizeof(s2) ? sizeof(s1) : sizeof(s2) )
208
209 /**
210 ** platform-independent login functions
211 **/
212
213 /* login_login(struct logininfo *) -Record a login
214 *
215 * Call with a pointer to a struct logininfo initialised with
216 * login_init_entry() or login_alloc_entry()
217 *
218 * Returns:
219 * >0 if successful
220 * 0 on failure (will use OpenSSH's logging facilities for diagnostics)
221 */
222 int
223 login_login (struct logininfo *li)
224 {
225 li->type = LTYPE_LOGIN;
226 return login_write(li);
227 }
228
229
230 /* login_logout(struct logininfo *) - Record a logout
231 *
232 * Call as with login_login()
233 *
234 * Returns:
235 * >0 if successful
236 * 0 on failure (will use OpenSSH's logging facilities for diagnostics)
237 */
238 int
239 login_logout(struct logininfo *li)
240 {
241 li->type = LTYPE_LOGOUT;
242 return login_write(li);
243 }
244
245 /* login_get_lastlog_time(int) - Retrieve the last login time
246 *
247 * Retrieve the last login time for the given uid. Will try to use the
248 * system lastlog facilities if they are available, but will fall back
249 * to looking in wtmp/wtmpx if necessary
250 *
251 * Returns:
252 * 0 on failure, or if user has never logged in
253 * Time in seconds from the epoch if successful
254 *
255 * Useful preprocessor symbols:
256 * DISABLE_LASTLOG: If set, *never* even try to retrieve lastlog
257 * info
258 * USE_LASTLOG: If set, indicates the presence of system lastlog
259 * facilities. If this and DISABLE_LASTLOG are not set,
260 * try to retrieve lastlog information from wtmp/wtmpx.
261 */
262 #if 0
263 unsigned int
264 login_get_lastlog_time(const int uid)
265 {
266 struct logininfo li;
267
268 if (login_get_lastlog(&li, uid))
269 return li.tv_sec;
270 else
271 return 0;
272 }
273 #endif
274
275 /* login_get_lastlog(struct logininfo *, int) - Retrieve a lastlog entry
276 *
277 * Retrieve a logininfo structure populated (only partially) with
278 * information from the system lastlog data, or from wtmp/wtmpx if no
279 * system lastlog information exists.
280 *
281 * Note this routine must be given a pre-allocated logininfo.
282 *
283 * Returns:
284 * >0: A pointer to your struct logininfo if successful
285 * 0 on failure (will use OpenSSH's logging facilities for diagnostics)
286 *
287 */
288 struct logininfo *
289 login_get_lastlog(struct logininfo *li, const int uid)
290 {
291 struct passwd *pw;
292
293 (void) memset(li, '\0', sizeof(*li));
294 li->uid = uid;
295
296 /*
297 * If we don't have a 'real' lastlog, we need the username to
298 * reliably search wtmp(x) for the last login (see
299 * wtmp_get_entry().)
300 */
301 pw = getpwuid(uid);
302 if (pw == NULL)
303 fatal("login_get_lastlog: Cannot find account for uid %i", uid);
304
305 /* No MIN_SIZEOF here - we absolutely *must not* truncate the
306 * username */
307 (void) strlcpy(li->username, pw->pw_name, sizeof(li->username));
308
309 if (getlast_entry(li))
310 return li;
311 else
312 return NULL;
313 }
314
315
316 /* login_alloc_entry() - Allocate and initialise a logininfo
317 * structure
318 *
319 * This function creates a new struct logininfo, a data structure
320 * meant to carry the information required to portably record login info.
321 *
322 * Returns a pointer to a newly created struct logininfo. If memory
323 * allocation fails, the program halts.
324 */
325 struct
326 logininfo *login_alloc_entry(int pid, const char *username,
327 const char *hostname, const char *line,
328 const char *progname)
329 {
330 struct logininfo *newli;
331
332 newli = (struct logininfo *) xmalloc (sizeof(*newli));
333 (void)login_init_entry(newli, pid, username, hostname, line, progname);
334 return newli;
335 }
336
337
338 /* login_free_entry(struct logininfo *) - free struct memory */
339 void
340 login_free_entry(struct logininfo *li)
341 {
342 xfree(li);
343 }
344
345
346 /* login_init_entry()
347 * - initialise a struct logininfo
348 *
349 * Populates a new struct logininfo, a data structure meant to carry
350 * the information required to portably record login info.
351 *
352 * Returns: 1
353 */
354 int
355 login_init_entry(struct logininfo *li, int pid, const char *username,
356 const char *hostname, const char *line, const char *progname)
357 {
358 struct passwd *pw;
359
360 (void) memset(li, 0, sizeof(*li));
361
362 li->pid = pid;
363
364 /* set the line information */
365 if (line)
366 (void) line_fullname(li->line, line, sizeof(li->line));
367 else
368 li->line_null = 1;
369
370 if (progname)
371 (void) strlcpy(li->progname, progname, sizeof(li->progname));
372 else
373 li->progname_null = 1;
374
375 if (username) {
376 (void) strlcpy(li->username, username, sizeof(li->username));
377 pw = getpwnam(li->username);
378 if (pw == NULL)
379 fatal("login_init_entry: Cannot find user \"%s\"", li->username);
380 li->uid = pw->pw_uid;
381 }
382
383 if (hostname)
384 (void) strlcpy(li->hostname, hostname, sizeof(li->hostname));
385
386 return 1;
387 }
388
389 /* login_set_current_time(struct logininfo *) - set the current time
390 *
391 * Set the current time in a logininfo structure. This function is
392 * meant to eliminate the need to deal with system dependencies for
393 * time handling.
394 */
395 void
396 login_set_current_time(struct logininfo *li)
397 {
398 struct timeval tv;
399
400 (void) gettimeofday(&tv, NULL);
401
402 li->tv_sec = tv.tv_sec;
403 li->tv_usec = tv.tv_usec;
404 }
405
406 /* copy a sockaddr_* into our logininfo */
407 void
408 login_set_addr(struct logininfo *li, const struct sockaddr *sa,
409 const unsigned int sa_size)
410 {
411 unsigned int bufsize = sa_size;
412
413 /* make sure we don't overrun our union */
414 if (sizeof(li->hostaddr) < sa_size)
415 bufsize = sizeof(li->hostaddr);
416
417 (void) memcpy((void *)&(li->hostaddr.sa), (const void *)sa, bufsize);
418 }
419
420
421 /**
422 ** login_write: Call low-level recording functions based on autoconf
423 ** results
424 **/
425 int
426 login_write (struct logininfo *li)
427 {
428 #ifndef HAVE_CYGWIN
429 if ((int)geteuid() != 0) {
430 log("Attempt to write login records by non-root user (aborting)");
431 return 1;
432 }
433 #endif
434
435 /* set the timestamp */
436 login_set_current_time(li);
437 #ifdef USE_LOGIN
438 syslogin_write_entry(li);
439 #endif
440 #ifdef USE_LASTLOG
441 if (li->type == LTYPE_LOGIN) {
442 (void) lastlog_write_entry(li);
443 }
444 #endif
445 #ifdef USE_UTMP
446 utmp_write_entry(li);
447 #endif
448 #ifdef USE_WTMP
449 wtmp_write_entry(li);
450 #endif
451 #ifdef USE_UTMPX
452 (void) utmpx_write_entry(li);
453 #endif
454 #ifdef USE_WTMPX
455 (void) wtmpx_write_entry(li);
456 #endif
457 return 0;
458 }
459
460 /**
461 ** getlast_entry: Call low-level functions to retrieve the last login
462 ** time.
463 **/
464
465 /* take the uid in li and return the last login time */
466 int
467 getlast_entry(struct logininfo *li)
468 {
469 #ifdef USE_LASTLOG
470 return(lastlog_get_entry(li));
471 #else /* !USE_LASTLOG */
472
473 #ifdef DISABLE_LASTLOG
474 /* On some systems we shouldn't even try to obtain last login
475 * time, e.g. AIX */
476 return 0;
477 # else /* DISABLE_LASTLOG */
478 /* Try to retrieve the last login time from wtmp */
479 # if defined(USE_WTMP) && (defined(HAVE_TIME_IN_UTMP) || defined(HAVE_TV_IN_UTMP))
480 /* retrieve last login time from utmp */
481 return (wtmp_get_entry(li));
482 # else /* defined(USE_WTMP) && (defined(HAVE_TIME_IN_UTMP) || defined(HAVE_TV_IN_UTMP)) */
483 /* If wtmp isn't available, try wtmpx */
484 # if defined(USE_WTMPX) && (defined(HAVE_TIME_IN_UTMPX) || defined(HAVE_TV_IN_UTMPX))
485 /* retrieve last login time from utmpx */
486 return (wtmpx_get_entry(li));
487 # else
488 /* Give up: No means of retrieving last login time */
489 return 0;
490 # endif /* USE_WTMPX && (HAVE_TIME_IN_UTMPX || HAVE_TV_IN_UTMPX) */
491 # endif /* USE_WTMP && (HAVE_TIME_IN_UTMP || HAVE_TV_IN_UTMP) */
492 # endif /* DISABLE_LASTLOG */
493 #endif /* USE_LASTLOG */
494 }
495
496
497
498 /*
499 * 'line' string utility functions
500 *
501 * These functions process the 'line' string into one of three forms:
502 *
503 * 1. The full filename (including '/dev')
504 * 2. The stripped name (excluding '/dev')
505 * 3. The abbreviated name (e.g. /dev/ttyp00 -> yp00
506 * /dev/pts/1 -> ts/1 )
507 *
508 * Form 3 is used on some systems to identify a .tmp.? entry when
509 * attempting to remove it. Typically both addition and removal is
510 * performed by one application - say, sshd - so as long as the choice
511 * uniquely identifies a terminal it's ok.
512 */
513
514
515 /* line_fullname(): add the leading '/dev/' if it doesn't exist make
516 * sure dst has enough space, if not just copy src (ugh) */
517 char *
518 line_fullname(char *dst, const char *src, int dstsize)
519 {
520 (void) memset(dst, '\0', dstsize);
521 /* "sshd" is special, like "ftp" */
522 if (strcmp(src, "sshd") ||
523 ((strncmp(src, "/dev/", 5) == 0) || (dstsize < (strlen(src) + 5)))) {
524 (void) strlcpy(dst, src, dstsize);
525 } else {
526 (void) strlcpy(dst, "/dev/", dstsize);
527 (void) strlcat(dst, src, dstsize);
528 }
529 return dst;
530 }
531
532 /* line_stripname(): strip the leading '/dev' if it exists, return dst */
533 char *
534 line_stripname(char *dst, const char *src, int dstsize)
535 {
536 (void) memset(dst, '\0', dstsize);
537 if (strncmp(src, "/dev/", 5) == 0)
538 (void) strlcpy(dst, src + 5, dstsize);
539 else
540 (void) strlcpy(dst, src, dstsize);
541 return dst;
542 }
543
544 /* line_abbrevname(): Return the abbreviated (usually four-character)
545 * form of the line (Just use the last <dstsize> characters of the
546 * full name.)
547 *
548 * NOTE: use strncpy because we do NOT necessarily want zero
549 * termination */
550 char *
551 line_abbrevname(char *dst, const char *src, int dstsize)
552 {
553 size_t len;
554
555 (void) memset(dst, '\0', dstsize);
556
557 /* Always skip prefix if present */
558 if (strncmp(src, "/dev/", 5) == 0)
559 src += 5;
560
561 #ifdef WITH_ABBREV_NO_TTY
562 if (strncmp(src, "tty", 3) == 0)
563 src += 3;
564 #endif
565
566 len = strlen(src);
567
568 if (len > 0) {
569 if (((int)len - dstsize) > 0)
570 src += ((int)len - dstsize);
571
572 /* note: _don't_ change this to strlcpy */
573 (void) strncpy(dst, src, (size_t)dstsize);
574 }
575
576 return dst;
577 }
578
579 /**
580 ** utmp utility functions
581 **
582 ** These functions manipulate struct utmp, taking system differences
583 ** into account.
584 **/
585
586 #if defined(USE_UTMP) || defined (USE_WTMP) || defined (USE_LOGIN)
587
588 /* build the utmp structure */
589 void
590 set_utmp_time(struct logininfo *li, struct utmp *ut)
591 {
592 # ifdef HAVE_TV_IN_UTMP
593 ut->ut_tv.tv_sec = li->tv_sec;
594 ut->ut_tv.tv_usec = li->tv_usec;
595 # else
596 # ifdef HAVE_TIME_IN_UTMP
597 ut->ut_time = li->tv_sec;
598 # endif
599 # endif
600 }
601
602 void
603 construct_utmp(struct logininfo *li,
604 struct utmp *ut)
605 {
606 (void) memset(ut, '\0', sizeof(*ut));
607
608 /* First fill out fields used for both logins and logouts */
609
610 # ifdef HAVE_ID_IN_UTMP
611 (void) line_abbrevname(ut->ut_id, li->line, sizeof(ut->ut_id));
612 # endif
613
614 # ifdef HAVE_TYPE_IN_UTMP
615 /* This is done here to keep utmp constants out of struct logininfo */
616 switch (li->type) {
617 case LTYPE_LOGIN:
618 ut->ut_type = USER_PROCESS;
619 #ifdef _UNICOS
620 cray_set_tmpdir(ut);
621 #endif
622 break;
623 case LTYPE_LOGOUT:
624 ut->ut_type = DEAD_PROCESS;
625 #ifdef _UNICOS
626 cray_retain_utmp(ut, li->pid);
627 #endif
628 break;
629 }
630 # endif
631 set_utmp_time(li, ut);
632
633 (void) line_stripname(ut->ut_line, li->line, sizeof(ut->ut_line));
634
635 # ifdef HAVE_PID_IN_UTMP
636 ut->ut_pid = li->pid;
637 # endif
638
639 /* If we're logging out, leave all other fields blank */
640 if (li->type == LTYPE_LOGOUT)
641 return;
642
643 /*
644 * These fields are only used when logging in, and are blank
645 * for logouts.
646 */
647
648 /* Use strncpy because we don't necessarily want null termination */
649 (void) strncpy(ut->ut_name, li->username, MIN_SIZEOF(ut->ut_name, li->username));
650 # ifdef HAVE_HOST_IN_UTMP
651 (void) strncpy(ut->ut_host, li->hostname, MIN_SIZEOF(ut->ut_host, li->hostname));
652 # endif
653 # ifdef HAVE_ADDR_IN_UTMP
654 /* this is just a 32-bit IP address */
655 if (li->hostaddr.sa.sa_family == AF_INET)
656 ut->ut_addr = li->hostaddr.sa_in.sin_addr.s_addr;
657 # endif
658 }
659 #endif /* USE_UTMP || USE_WTMP || USE_LOGIN */
660
661 /**
662 ** utmpx utility functions
663 **
664 ** These functions manipulate struct utmpx, accounting for system
665 ** variations.
666 **/
667
668 #if defined(USE_UTMPX) || defined (USE_WTMPX)
669 /* build the utmpx structure */
670 void
671 set_utmpx_time(struct logininfo *li, struct utmpx *utx)
672 {
673 # ifdef HAVE_TV_IN_UTMPX
674 utx->ut_tv.tv_sec = li->tv_sec;
675 utx->ut_tv.tv_usec = li->tv_usec;
676 # else /* HAVE_TV_IN_UTMPX */
677 # ifdef HAVE_TIME_IN_UTMPX
678 utx->ut_time = li->tv_sec;
679 # endif /* HAVE_TIME_IN_UTMPX */
680 # endif /* HAVE_TV_IN_UTMPX */
681 }
682
683 void
684 construct_utmpx(struct logininfo *li, struct utmpx *utx)
685 {
686 (void) memset(utx, '\0', sizeof(*utx));
687 # ifdef HAVE_ID_IN_UTMPX
688 (void) line_abbrevname(utx->ut_id, li->line, sizeof(utx->ut_id));
689 # endif
690
691 /* this is done here to keep utmp constants out of loginrec.h */
692 switch (li->type) {
693 case LTYPE_LOGIN:
694 utx->ut_type = USER_PROCESS;
695 break;
696 case LTYPE_LOGOUT:
697 utx->ut_type = DEAD_PROCESS;
698 break;
699 }
700 if (!li->line_null)
701 (void) line_stripname(utx->ut_line, li->line, sizeof(utx->ut_line));
702 else if (!li->progname_null)
703 (void) line_stripname(utx->ut_line, li->progname, sizeof(utx->ut_line));
704
705 set_utmpx_time(li, utx);
706 utx->ut_pid = li->pid;
707 /* strncpy(): Don't necessarily want null termination */
708 (void) strncpy(utx->ut_name, li->username, MIN_SIZEOF(utx->ut_name, li->username));
709
710 if (li->type == LTYPE_LOGOUT)
711 return;
712
713 /*
714 * These fields are only used when logging in, and are blank
715 * for logouts.
716 */
717
718 # ifdef HAVE_HOST_IN_UTMPX
719 (void) strncpy(utx->ut_host, li->hostname, MIN_SIZEOF(utx->ut_host, li->hostname));
720 # endif
721 # ifdef HAVE_ADDR_IN_UTMPX
722 /* this is just a 32-bit IP address */
723 if (li->hostaddr.sa.sa_family == AF_INET)
724 utx->ut_addr = li->hostaddr.sa_in.sin_addr.s_addr;
725 # endif
726 # ifdef HAVE_SYSLEN_IN_UTMPX
727 /* ut_syslen is the length of the utx_host string */
728 utx->ut_syslen = MIN(strlen(li->hostname), sizeof(utx->ut_host));
729 # endif
730 }
731 #endif /* USE_UTMPX || USE_WTMPX */
732
733 /**
734 ** Low-level utmp functions
735 **/
736
737 /* FIXME: (ATL) utmp_write_direct needs testing */
738 #ifdef USE_UTMP
739
740 /* if we can, use pututline() etc. */
741 # if !defined(DISABLE_PUTUTLINE) && defined(HAVE_SETUTENT) && \
742 defined(HAVE_PUTUTLINE)
743 # define UTMP_USE_LIBRARY
744 # endif
745
746
747 /* write a utmp entry with the system's help (pututline() and pals) */
748 # ifdef UTMP_USE_LIBRARY
749 static int
750 utmp_write_library(struct logininfo *li, struct utmp *ut)
751 {
752 setutent();
753 pututline(ut);
754
755 # ifdef HAVE_ENDUTENT
756 endutent();
757 # endif
758 return 1;
759 }
760 # else /* UTMP_USE_LIBRARY */
761
762 /* write a utmp entry direct to the file */
763 /* This is a slightly modification of code in OpenBSD's login.c */
764 static int
765 utmp_write_direct(struct logininfo *li, struct utmp *ut)
766 {
767 struct utmp old_ut;
768 register int fd;
769 int tty;
770
771 /* FIXME: (ATL) ttyslot() needs local implementation */
772
773 #if defined(HAVE_GETTTYENT)
774 register struct ttyent *ty;
775
776 tty=0;
777
778 setttyent();
779 while ((struct ttyent *)0 != (ty = getttyent())) {
780 tty++;
781 if (!strncmp(ty->ty_name, ut->ut_line, sizeof(ut->ut_line)))
782 break;
783 }
784 endttyent();
785
786 if((struct ttyent *)0 == ty) {
787 log("utmp_write_entry: tty not found");
788 return(1);
789 }
790 #else /* FIXME */
791
792 tty = ttyslot(); /* seems only to work for /dev/ttyp? style names */
793
794 #endif /* HAVE_GETTTYENT */
795
796 if (tty > 0 && (fd = open(UTMP_FILE, O_RDWR|O_CREAT, 0644)) >= 0) {
797 (void)lseek(fd, (off_t)(tty * sizeof(struct utmp)), SEEK_SET);
798 /*
799 * Prevent luser from zero'ing out ut_host.
800 * If the new ut_line is empty but the old one is not
801 * and ut_line and ut_name match, preserve the old ut_line.
802 */
803 if (atomicio(read, fd, &old_ut, sizeof(old_ut)) == sizeof(old_ut) &&
804 (ut->ut_host[0] == '\0') && (old_ut.ut_host[0] != '\0') &&
805 (strncmp(old_ut.ut_line, ut->ut_line, sizeof(ut->ut_line)) == 0) &&
806 (strncmp(old_ut.ut_name, ut->ut_name, sizeof(ut->ut_name)) == 0)) {
807 (void)memcpy(ut->ut_host, old_ut.ut_host, sizeof(ut->ut_host));
808 }
809
810 (void)lseek(fd, (off_t)(tty * sizeof(struct utmp)), SEEK_SET);
811 if (atomicio(write, fd, ut, sizeof(*ut)) != sizeof(*ut))
812 log("utmp_write_direct: error writing %s: %s",
813 UTMP_FILE, strerror(errno));
814
815 (void)close(fd);
816 return 1;
817 } else {
818 return 0;
819 }
820 }
821 # endif /* UTMP_USE_LIBRARY */
822
823 static int
824 utmp_perform_login(struct logininfo *li)
825 {
826 struct utmp ut;
827
828 construct_utmp(li, &ut);
829 # ifdef UTMP_USE_LIBRARY
830 if (!utmp_write_library(li, &ut)) {
831 log("utmp_perform_login: utmp_write_library() failed");
832 return 0;
833 }
834 # else
835 if (!utmp_write_direct(li, &ut)) {
836 log("utmp_perform_login: utmp_write_direct() failed");
837 return 0;
838 }
839 # endif
840 return 1;
841 }
842
843
844 static int
845 utmp_perform_logout(struct logininfo *li)
846 {
847 struct utmp ut;
848
849 construct_utmp(li, &ut);
850 # ifdef UTMP_USE_LIBRARY
851 if (!utmp_write_library(li, &ut)) {
852 log("utmp_perform_logout: utmp_write_library() failed");
853 return 0;
854 }
855 # else
856 if (!utmp_write_direct(li, &ut)) {
857 log("utmp_perform_logout: utmp_write_direct() failed");
858 return 0;
859 }
860 # endif
861 return 1;
862 }
863
864
865 int
866 utmp_write_entry(struct logininfo *li)
867 {
868 if (li->line_null) {
869 debug3("not writing utmp entry");
870 return 1;
871 }
872 debug3("writing utmp entry");
873
874 switch(li->type) {
875 case LTYPE_LOGIN:
876 return utmp_perform_login(li);
877
878 case LTYPE_LOGOUT:
879 return utmp_perform_logout(li);
880
881 default:
882 log("utmp_write_entry: invalid type field");
883 return 0;
884 }
885 }
886 #endif /* USE_UTMP */
887
888
889 /**
890 ** Low-level utmpx functions
891 **/
892
893 /* not much point if we don't want utmpx entries */
894 #ifdef USE_UTMPX
895
896 /* if we have the wherewithall, use pututxline etc. */
897 # if !defined(DISABLE_PUTUTXLINE) && defined(HAVE_SETUTXENT) && \
898 defined(HAVE_PUTUTXLINE)
899 # define UTMPX_USE_LIBRARY
900 # endif
901
902
903 /* write a utmpx entry with the system's help (pututxline() and pals) */
904 # ifdef UTMPX_USE_LIBRARY
905 static int
906 utmpx_write_library(struct logininfo *li, struct utmpx *utx)
907 {
908 setutxent();
909 (void) pututxline(utx);
910
911 # ifdef HAVE_ENDUTXENT
912 endutxent();
913 # endif
914 return 1;
915 }
916
917 # else /* UTMPX_USE_LIBRARY */
918
919 /* write a utmp entry direct to the file */
920 static int
921 utmpx_write_direct(struct logininfo *li, struct utmpx *utx)
922 {
923 log("utmpx_write_direct: not implemented!");
924 return 0;
925 }
926 # endif /* UTMPX_USE_LIBRARY */
927
928 static int
929 utmpx_perform_login(struct logininfo *li)
930 {
931 struct utmpx utx;
932
933 construct_utmpx(li, &utx);
934 # ifdef UTMPX_USE_LIBRARY
935 if (!utmpx_write_library(li, &utx)) {
936 log("tmpx_perform_login: utmp_write_library() failed");
937 return 0;
938 }
939 # else
940 if (!utmpx_write_direct(li, &ut)) {
941 log("utmpx_perform_login: utmp_write_direct() failed");
942 return 0;
943 }
944 # endif
945 return 1;
946 }
947
948
949 static int
950 utmpx_perform_logout(struct logininfo *li)
951 {
952 struct utmpx utx;
953
954 construct_utmpx(li, &utx);
955 # ifdef HAVE_ID_IN_UTMPX
956 (void) line_abbrevname(utx.ut_id, li->line, sizeof(utx.ut_id));
957 # endif
958 # ifdef HAVE_TYPE_IN_UTMPX
959 utx.ut_type = DEAD_PROCESS;
960 # endif
961
962 # ifdef UTMPX_USE_LIBRARY
963 (void) utmpx_write_library(li, &utx);
964 # else
965 utmpx_write_direct(li, &utx);
966 # endif
967 return 1;
968 }
969
970 int
971 utmpx_write_entry(struct logininfo *li)
972 {
973 if (li->line_null) {
974 debug3("not writing utmpx entry");
975 return 1;
976 }
977 debug3("writing utmpx entry");
978
979 switch(li->type) {
980 case LTYPE_LOGIN:
981 return utmpx_perform_login(li);
982 case LTYPE_LOGOUT:
983 return utmpx_perform_logout(li);
984 default:
985 log("utmpx_write_entry: invalid type field");
986 return 0;
987 }
988 }
989 #endif /* USE_UTMPX */
990
991
992 /**
993 ** Low-level wtmp functions
994 **/
995
996 #ifdef USE_WTMP
997
998 /* write a wtmp entry direct to the end of the file */
999 /* This is a slight modification of code in OpenBSD's logwtmp.c */
1000 static int
1001 wtmp_write(struct logininfo *li, struct utmp *ut)
1002 {
1003 struct stat buf;
1004 int fd, ret = 1;
1005
1006 if ((fd = open(WTMP_FILE, O_WRONLY|O_APPEND, 0)) < 0) {
1007 log("wtmp_write: problem writing %s: %s",
1008 WTMP_FILE, strerror(errno));
1009 return 0;
1010 }
1011 if (fstat(fd, &buf) == 0)
1012 if (atomicio(write, fd, ut, sizeof(*ut)) != sizeof(*ut)) {
1013 (void) ftruncate(fd, buf.st_size);
1014 log("wtmp_write: problem writing %s: %s",
1015 WTMP_FILE, strerror(errno));
1016 ret = 0;
1017 }
1018 (void)close(fd);
1019 return ret;
1020 }
1021
1022 static int
1023 wtmp_perform_login(struct logininfo *li)
1024 {
1025 struct utmp ut;
1026
1027 construct_utmp(li, &ut);
1028 return wtmp_write(li, &ut);
1029 }
1030
1031
1032 static int
1033 wtmp_perform_logout(struct logininfo *li)
1034 {
1035 struct utmp ut;
1036
1037 construct_utmp(li, &ut);
1038 return wtmp_write(li, &ut);
1039 }
1040
1041
1042 int
1043 wtmp_write_entry(struct logininfo *li)
1044 {
1045 switch(li->type) {
1046 case LTYPE_LOGIN:
1047 return wtmp_perform_login(li);
1048 case LTYPE_LOGOUT:
1049 return wtmp_perform_logout(li);
1050 default:
1051 log("wtmp_write_entry: invalid type field");
1052 return 0;
1053 }
1054 }
1055
1056
1057 /* Notes on fetching login data from wtmp/wtmpx
1058 *
1059 * Logouts are usually recorded with (amongst other things) a blank
1060 * username on a given tty line. However, some systems (HP-UX is one)
1061 * leave all fields set, but change the ut_type field to DEAD_PROCESS.
1062 *
1063 * Since we're only looking for logins here, we know that the username
1064 * must be set correctly. On systems that leave it in, we check for
1065 * ut_type==USER_PROCESS (indicating a login.)
1066 *
1067 * Portability: Some systems may set something other than USER_PROCESS
1068 * to indicate a login process. I don't know of any as I write. Also,
1069 * it's possible that some systems may both leave the username in
1070 * place and not have ut_type.
1071 */
1072
1073 /* return true if this wtmp entry indicates a login */
1074 static int
1075 wtmp_islogin(struct logininfo *li, struct utmp *ut)
1076 {
1077 if (strncmp(li->username, ut->ut_name,
1078 MIN_SIZEOF(li->username, ut->ut_name)) == 0) {
1079 # ifdef HAVE_TYPE_IN_UTMP
1080 if (ut->ut_type & USER_PROCESS)
1081 return 1;
1082 # else
1083 return 1;
1084 # endif
1085 }
1086 return 0;
1087 }
1088
1089 int
1090 wtmp_get_entry(struct logininfo *li)
1091 {
1092 struct stat st;
1093 struct utmp ut;
1094 int fd, found=0;
1095
1096 /* Clear the time entries in our logininfo */
1097 li->tv_sec = li->tv_usec = 0;
1098
1099 if ((fd = open(WTMP_FILE, O_RDONLY)) < 0) {
1100 log("wtmp_get_entry: problem opening %s: %s",
1101 WTMP_FILE, strerror(errno));
1102 return 0;
1103 }
1104 if (fstat(fd, &st) != 0) {
1105 log("wtmp_get_entry: couldn't stat %s: %s",
1106 WTMP_FILE, strerror(errno));
1107 (void) close(fd);
1108 return 0;
1109 }
1110
1111 /* Seek to the start of the last struct utmp */
1112 if (lseek(fd, -(off_t)sizeof(struct utmp), SEEK_END) == -1) {
1113 /* Looks like we've got a fresh wtmp file */
1114 (void) close(fd);
1115 return 0;
1116 }
1117
1118 while (!found) {
1119 if (atomicio(read, fd, &ut, sizeof(ut)) != sizeof(ut)) {
1120 log("wtmp_get_entry: read of %s failed: %s",
1121 WTMP_FILE, strerror(errno));
1122 (void) close (fd);
1123 return 0;
1124 }
1125 if ( wtmp_islogin(li, &ut) ) {
1126 found = 1;
1127 /* We've already checked for a time in struct
1128 * utmp, in login_getlast(). */
1129 # ifdef HAVE_TIME_IN_UTMP
1130 li->tv_sec = ut.ut_time;
1131 # else
1132 # if HAVE_TV_IN_UTMP
1133 li->tv_sec = ut.ut_tv.tv_sec;
1134 # endif
1135 # endif
1136 (void) line_fullname(li->line, ut.ut_line,
1137 MIN_SIZEOF(li->line, ut.ut_line));
1138 # ifdef HAVE_HOST_IN_UTMP
1139 (void) strlcpy(li->hostname, ut.ut_host,
1140 MIN_SIZEOF(li->hostname, ut.ut_host));
1141 # endif
1142 continue;
1143 }
1144 /* Seek back 2 x struct utmp */
1145 if (lseek(fd, -(off_t)(2 * sizeof(struct utmp)), SEEK_CUR) == -1) {
1146 /* We've found the start of the file, so quit */
1147 (void) close (fd);
1148 return 0;
1149 }
1150 }
1151
1152 /* We found an entry. Tidy up and return */
1153 (void) close(fd);
1154 return 1;
1155 }
1156 # endif /* USE_WTMP */
1157
1158
1159 /**
1160 ** Low-level wtmpx functions
1161 **/
1162
1163 #ifdef USE_WTMPX
1164 /* write a wtmpx entry direct to the end of the file */
1165 /* This is a slight modification of code in OpenBSD's logwtmp.c */
1166 static int
1167 wtmpx_write(struct logininfo *li, struct utmpx *utx)
1168 {
1169 struct stat buf;
1170 int fd, ret = 1;
1171
1172 if ((fd = open(WTMPX_FILE, O_WRONLY|O_APPEND, 0)) < 0) {
1173 log("wtmpx_write: problem opening %s: %s",
1174 WTMPX_FILE, strerror(errno));
1175 return 0;
1176 }
1177
1178 if (fstat(fd, &buf) == 0)
1179 if (atomicio(write, fd, utx, sizeof(*utx)) != sizeof(*utx)) {
1180 (void) ftruncate(fd, buf.st_size);
1181 log("wtmpx_write: problem writing %s: %s",
1182 WTMPX_FILE, strerror(errno));
1183 ret = 0;
1184 }
1185 (void)close(fd);
1186
1187 return ret;
1188 }
1189
1190
1191 static int
1192 wtmpx_perform_login(struct logininfo *li)
1193 {
1194 struct utmpx utx;
1195
1196 construct_utmpx(li, &utx);
1197 return wtmpx_write(li, &utx);
1198 }
1199
1200
1201 static int
1202 wtmpx_perform_logout(struct logininfo *li)
1203 {
1204 struct utmpx utx;
1205
1206 construct_utmpx(li, &utx);
1207 return wtmpx_write(li, &utx);
1208 }
1209
1210
1211 int
1212 wtmpx_write_entry(struct logininfo *li)
1213 {
1214 switch(li->type) {
1215 case LTYPE_LOGIN:
1216 return wtmpx_perform_login(li);
1217 case LTYPE_LOGOUT:
1218 return wtmpx_perform_logout(li);
1219 default:
1220 log("wtmpx_write_entry: invalid type field");
1221 return 0;
1222 }
1223 }
1224
1225 /* Please see the notes above wtmp_islogin() for information about the
1226 next two functions */
1227
1228 /* Return true if this wtmpx entry indicates a login */
1229 static int
1230 wtmpx_islogin(struct logininfo *li, struct utmpx *utx)
1231 {
1232 if ( strncmp(li->username, utx->ut_name,
1233 MIN_SIZEOF(li->username, utx->ut_name)) == 0 ) {
1234 # ifdef HAVE_TYPE_IN_UTMPX
1235 if (utx->ut_type == USER_PROCESS)
1236 return 1;
1237 # else
1238 return 1;
1239 # endif
1240 }
1241 return 0;
1242 }
1243
1244
1245 #if 0
1246 int
1247 wtmpx_get_entry(struct logininfo *li)
1248 {
1249 struct stat st;
1250 struct utmpx utx;
1251 int fd, found=0;
1252
1253 /* Clear the time entries */
1254 li->tv_sec = li->tv_usec = 0;
1255
1256 if ((fd = open(WTMPX_FILE, O_RDONLY)) < 0) {
1257 log("wtmpx_get_entry: problem opening %s: %s",
1258 WTMPX_FILE, strerror(errno));
1259 return 0;
1260 }
1261 if (fstat(fd, &st) != 0) {
1262 log("wtmpx_get_entry: couldn't stat %s: %s",
1263 WTMPX_FILE, strerror(errno));
1264 (void) close(fd);
1265 return 0;
1266 }
1267
1268 /* Seek to the start of the last struct utmpx */
1269 if (lseek(fd, -(off_t)sizeof(struct utmpx), SEEK_END) == -1 ) {
1270 /* probably a newly rotated wtmpx file */
1271 (void) close(fd);
1272 return 0;
1273 }
1274
1275 while (!found) {
1276 if (atomicio(read, fd, &utx, sizeof(utx)) != sizeof(utx)) {
1277 log("wtmpx_get_entry: read of %s failed: %s",
1278 WTMPX_FILE, strerror(errno));
1279 (void) close (fd);
1280 return 0;
1281 }
1282 /* Logouts are recorded as a blank username on a particular line.
1283 * So, we just need to find the username in struct utmpx */
1284 if ( wtmpx_islogin(li, &utx) ) {
1285 found = 1;
1286 # ifdef HAVE_TV_IN_UTMPX
1287 li->tv_sec = utx.ut_tv.tv_sec;
1288 # else
1289 # ifdef HAVE_TIME_IN_UTMPX
1290 li->tv_sec = utx.ut_time;
1291 # endif
1292 # endif
1293 (void) line_fullname(li->line, utx.ut_line, sizeof(li->line));
1294 # ifdef HAVE_HOST_IN_UTMPX
1295 (void) strlcpy(li->hostname, utx.ut_host,
1296 MIN_SIZEOF(li->hostname, utx.ut_host));
1297 # endif
1298 continue;
1299 }
1300 if (lseek(fd, -(off_t)(2 * sizeof(struct utmpx)), SEEK_CUR) == -1) {
1301 (void) close (fd);
1302 return 0;
1303 }
1304 }
1305
1306 (void) close(fd);
1307 return 1;
1308 }
1309 #endif
1310 #endif /* USE_WTMPX */
1311
1312 /**
1313 ** Low-level libutil login() functions
1314 **/
1315
1316 #ifdef USE_LOGIN
1317 static int
1318 syslogin_perform_login(struct logininfo *li)
1319 {
1320 struct utmp *ut;
1321
1322 if (! (ut = (struct utmp *)malloc(sizeof(*ut)))) {
1323 log("syslogin_perform_login: couldn't malloc()");
1324 return 0;
1325 }
1326 construct_utmp(li, ut);
1327 login(ut);
1328
1329 return 1;
1330 }
1331
1332 static int
1333 syslogin_perform_logout(struct logininfo *li)
1334 {
1335 # ifdef HAVE_LOGOUT
1336 char line[8];
1337
1338 (void)line_stripname(line, li->line, sizeof(line));
1339
1340 if (!logout(line)) {
1341 log("syslogin_perform_logout: logout() returned an error");
1342 # ifdef HAVE_LOGWTMP
1343 } else {
1344 logwtmp(line, "", "");
1345 # endif
1346 }
1347 /* FIXME: (ATL - if the need arises) What to do if we have
1348 * login, but no logout? what if logout but no logwtmp? All
1349 * routines are in libutil so they should all be there,
1350 * but... */
1351 # endif
1352 return 1;
1353 }
1354
1355 int
1356 syslogin_write_entry(struct logininfo *li)
1357 {
1358 switch (li->type) {
1359 case LTYPE_LOGIN:
1360 return syslogin_perform_login(li);
1361 case LTYPE_LOGOUT:
1362 return syslogin_perform_logout(li);
1363 default:
1364 log("syslogin_write_entry: Invalid type field");
1365 return 0;
1366 }
1367 }
1368 #endif /* USE_LOGIN */
1369
1370 /* end of file log-syslogin.c */
1371
1372 /**
1373 ** Low-level lastlog functions
1374 **/
1375
1376 #ifdef USE_LASTLOG
1377 #define LL_FILE 1
1378 #define LL_DIR 2
1379 #define LL_OTHER 3
1380
1381 static void
1382 lastlog_construct(struct logininfo *li, struct lastlog *last)
1383 {
1384 /* clear the structure */
1385 (void) memset(last, '\0', sizeof(*last));
1386
1387 (void)line_stripname(last->ll_line, li->line, sizeof(last->ll_line));
1388 (void) strlcpy(last->ll_host, li->hostname,
1389 MIN_SIZEOF(last->ll_host, li->hostname));
1390 last->ll_time = li->tv_sec;
1391 }
1392
1393 static int
1394 lastlog_filetype(char *filename)
1395 {
1396 struct stat st;
1397
1398 if (stat(LASTLOG_FILE, &st) != 0) {
1399 log("lastlog_perform_login: Couldn't stat %s: %s", LASTLOG_FILE,
1400 strerror(errno));
1401 return 0;
1402 }
1403 if (S_ISDIR(st.st_mode))
1404 return LL_DIR;
1405 else if (S_ISREG(st.st_mode))
1406 return LL_FILE;
1407 else
1408 return LL_OTHER;
1409 }
1410
1411
1412 /* open the file (using filemode) and seek to the login entry */
1413 static int
1414 lastlog_openseek(struct logininfo *li, int *fd, int filemode)
1415 {
1416 off_t offset;
1417 int type;
1418 char lastlog_file[1024];
1419
1420 type = lastlog_filetype(LASTLOG_FILE);
1421 switch (type) {
1422 case LL_FILE:
1423 (void) strlcpy(lastlog_file, LASTLOG_FILE, sizeof(lastlog_file));
1424 break;
1425 case LL_DIR:
1426 (void) snprintf(lastlog_file, sizeof(lastlog_file), "%s/%s",
1427 LASTLOG_FILE, li->username);
1428 break;
1429 default:
1430 log("lastlog_openseek: %.100s is not a file or directory!",
1431 LASTLOG_FILE);
1432 return 0;
1433 }
1434
1435 *fd = open(lastlog_file, filemode);
1436 if ( *fd < 0) {
1437 debug("lastlog_openseek: Couldn't open %s: %s",
1438 lastlog_file, strerror(errno));
1439 return 0;
1440 }
1441
1442 if (type == LL_FILE) {
1443 /* find this uid's offset in the lastlog file */
1444 offset = (off_t) ((long)li->uid * sizeof(struct lastlog));
1445
1446 if ( lseek(*fd, offset, SEEK_SET) != offset ) {
1447 log("lastlog_openseek: %s->lseek(): %s",
1448 lastlog_file, strerror(errno));
1449 return 0;
1450 }
1451 }
1452
1453 return 1;
1454 }
1455
1456 static int
1457 lastlog_perform_login(struct logininfo *li)
1458 {
1459 struct lastlog last;
1460 int fd;
1461
1462 /* create our struct lastlog */
1463 lastlog_construct(li, &last);
1464
1465 if (!lastlog_openseek(li, &fd, O_RDWR|O_CREAT))
1466 return(0);
1467
1468 /* write the entry */
1469 if (atomicio(write, fd, &last, sizeof(last)) != sizeof(last)) {
1470 (void) close(fd);
1471 log("lastlog_write_filemode: Error writing to %s: %s",
1472 LASTLOG_FILE, strerror(errno));
1473 return 0;
1474 }
1475
1476 (void) close(fd);
1477 return 1;
1478 }
1479
1480 int
1481 lastlog_write_entry(struct logininfo *li)
1482 {
1483 switch(li->type) {
1484 case LTYPE_LOGIN:
1485 return lastlog_perform_login(li);
1486 default:
1487 log("lastlog_write_entry: Invalid type field");
1488 return 0;
1489 }
1490 }
1491
1492 static void
1493 lastlog_populate_entry(struct logininfo *li, struct lastlog *last)
1494 {
1495 (void) line_fullname(li->line, last->ll_line, sizeof(li->line));
1496 (void) strlcpy(li->hostname, last->ll_host,
1497 MIN_SIZEOF(li->hostname, last->ll_host));
1498 li->tv_sec = last->ll_time;
1499 }
1500
1501 int
1502 lastlog_get_entry(struct logininfo *li)
1503 {
1504 struct lastlog last;
1505 int fd, ret;
1506
1507 if (!lastlog_openseek(li, &fd, O_RDONLY))
1508 return (0);
1509
1510 ret = atomicio(read, fd, &last, sizeof(last));
1511 close(fd);
1512
1513 switch (ret) {
1514 case 0:
1515 memset(&last, '\0', sizeof(last));
1516 /* FALLTHRU */
1517 case sizeof(last):
1518 lastlog_populate_entry(li, &last);
1519 return (1);
1520 case -1:
1521 error("%s: Error reading from %s: %s", __func__,
1522 LASTLOG_FILE, strerror(errno));
1523 return (0);
1524 default:
1525 error("%s: Error reading from %s: Expecting %d, got %d",
1526 __func__, LASTLOG_FILE, (int)sizeof(last), ret);
1527 return (0);
1528 }
1529
1530 /* NOTREACHED */
1531 return (0);
1532 }
1533 #endif /* USE_LASTLOG */