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
7 * Redistribution and use in source and binary forms, with or without
8 * modification, are permitted provided that the following conditions
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.
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.
34 ** loginrec.c: platform-independent login recording and lastlog retrieval
38 The new login code explained
39 ============================
41 This code attempts to provide a common interface to login recording
42 (utmp and friends) and last login time retrieval.
44 Its primary means of achieving this is to use 'struct logininfo', a
45 union of all the useful fields in the various different types of
46 system login record structures one finds on UNIX variants.
48 We depend on autoconf to define which recording methods are to be
49 used, and which fields are contained in the relevant data structures
50 on the local system. Many C preprocessor symbols affect which code
53 The code is designed to make it easy to modify a particular
54 recording method, without affecting other methods nor requiring so
55 many nested conditional compilation blocks as were commonplace in
58 For login recording, we try to use the local system's libraries as
59 these are clearly most likely to work correctly. For utmp systems
60 this usually means login() and logout() or setutent() etc., probably
61 in libutil, along with logwtmp() etc. On these systems, we fall back
62 to writing the files directly if we have to, though this method
63 requires very thorough testing so we do not corrupt local auditing
64 information. These files and their access methods are very system
67 For utmpx systems, the corresponding library functions are
68 setutxent() etc. To the author's knowledge, all utmpx systems have
69 these library functions and so no direct write is attempted. If such
70 a system exists and needs support, direct analogues of the [uw]tmp
73 Retrieving the time of last login ('lastlog') is in some ways even
74 more problemmatic than login recording. Some systems provide a
75 simple table of all users which we seek based on uid and retrieve a
76 relatively standard structure. Others record the same information in
77 a directory with a separate file, and others don't record the
78 information separately at all. For systems in the latter category,
79 we look backwards in the wtmp or wtmpx file for the last login entry
80 for our user. Naturally this is slower and on busy systems could
81 incur a significant performance penalty.
86 In OpenSSH all login recording and retrieval is performed in
87 login.c. Here you'll find working examples. Also, in the logintest.c
88 program there are more examples.
90 Internal handler calling method
91 -------------------------------
93 When a call is made to login_login() or login_logout(), both
94 routines set a struct logininfo flag defining which action (log in,
95 or log out) is to be taken. They both then call login_write(), which
96 calls whichever of the many structure-specific handlers autoconf
97 selects for the local system.
99 The handlers themselves handle system data structure specifics. Both
100 struct utmp and struct utmpx have utility functions (see
101 construct_utmp*()) to try to make it simpler to add extra systems
102 that introduce new features to either structure.
104 While it may seem terribly wasteful to replicate so much similar
105 code for each method, experience has shown that maintaining code to
106 write both struct utmp and utmpx in one function, whilst maintaining
107 support for all systems whether they have library support or not, is
108 a difficult and time-consuming task.
110 Lastlog support proceeds similarly. Functions login_get_lastlog()
111 (and its OpenSSH-tuned friend login_get_lastlog_time()) call
112 getlast_entry(), which tries one of three methods to find the last
113 login time. It uses local system lastlog support if it can,
114 otherwise it tries wtmp or wtmpx before giving up and returning 0,
120 In many cases it's possible to tweak autoconf to select the correct
121 methods for a particular platform, either by improving the detection
122 code (best), or by presetting DISABLE_<method> or CONF_<method>_FILE
123 symbols for the platform.
125 Use logintest to check which symbols are defined before modifying
126 configure.in and loginrec.c. (You have to build logintest yourself
127 with 'make logintest' as it's not built by default.)
129 Otherwise, patches to the specific method(s) are very helpful!
135 ** homegrown ttyslot()q
142 ** Linux (Redhat 6.2, need more variants)
143 ** HP-UX 10.20 (gcc only)
145 ** Testing required: Please send reports!
152 ** Platforms with known problems:
157 #include "includes.h"
166 # include <lastlog.h>
171 #include "loginrec.h"
176 ** prototypes for helper functions in this file
180 void set_utmp_time(struct logininfo *li, struct utmp *ut);
181 void construct_utmp(struct logininfo *li, struct utmp *ut);
185 void set_utmpx_time(struct logininfo *li, struct utmpx *ut);
186 void construct_utmpx(struct logininfo *li, struct utmpx *ut);
189 int utmp_write_entry(struct logininfo *li);
190 int utmpx_write_entry(struct logininfo *li);
191 int wtmp_write_entry(struct logininfo *li);
192 int wtmpx_write_entry(struct logininfo *li);
193 int lastlog_write_entry(struct logininfo *li);
194 int syslogin_write_entry(struct logininfo *li);
196 int getlast_entry(struct logininfo *li);
197 int lastlog_get_entry(struct logininfo *li);
198 int wtmp_get_entry(struct logininfo *li);
199 int wtmpx_get_entry(struct logininfo *li);
203 ** platform-independent login functions
208 login_login (struct logininfo *li)
210 li->type = LTYPE_LOGIN;
211 return login_write(li);
215 /* Record a logout */
217 login_logout(struct logininfo *li)
219 li->type = LTYPE_LOGOUT;
220 return login_write(li);
224 /* Retrieve the last login time for a user (or fake on from wtmp/wtmpx) */
226 login_get_lastlog_time(const int uid)
230 login_get_lastlog(&li, uid);
234 /* Retrieve a lastlog entry (or fake one from wtmp/wtmpx) */
236 login_get_lastlog(struct logininfo *li, const int uid)
238 memset(li, '\0', sizeof(struct logininfo));
240 if (getlast_entry(li))
247 /* login_alloc_entry() - allocate and initialise a logininfo */
249 logininfo *login_alloc_entry(int pid, const char *username,
250 const char *hostname, const char *line)
252 struct logininfo *newli;
254 newli = (struct logininfo *) xmalloc (sizeof(struct logininfo));
255 (void)login_init_entry(newli, pid, username, hostname, line);
260 /* login_free_entry() - free struct memory (trivial) */
262 login_free_entry(struct logininfo *li)
268 /* login_init_entry() - initialise a struct logininfo */
270 login_init_entry(struct logininfo *li, int pid, const char *username,
271 const char *hostname, const char *line)
273 /* zero the structure */
274 memset(li, 0, sizeof(struct logininfo));
277 /* set the line information */
279 line_fullname(li->line, line, sizeof(li->line));
282 strlcpy(li->username, username, sizeof(li->username));
284 strlcpy(li->hostname, hostname, sizeof(li->hostname));
290 login_set_current_time(struct logininfo *li)
292 #ifdef HAVE_SYS_TIME_H
295 gettimeofday(&tv, NULL);
296 li->tv_sec = tv.tv_sec ; li->tv_usec = tv.tv_usec;
300 li->tv_sec = tm; li->tv_usec = 0;
305 /* copy a sockaddr_* into our logininfo */
307 login_set_addr(struct logininfo *li, const struct sockaddr *sa,
308 const unsigned int sa_size)
310 unsigned int bufsize = sa_size;
312 /* make sure we don't overrun our union */
313 if (sizeof(li->hostaddr) < sa_size)
314 bufsize = sizeof(li->hostaddr);
316 memcpy((void *)&(li->hostaddr.sa), (const void *)sa, bufsize);
321 ** login_write: Call low-level recording functions based on autoconf
326 login_write (struct logininfo *li)
328 if ((int)geteuid() != 0) {
329 log("Attempt to write login records by non-root user (aborting)");
332 /* set the timestamp */
333 login_set_current_time(li);
335 syslogin_write_entry(li);
338 if (li->type == LTYPE_LOGIN) {
339 lastlog_write_entry(li);
343 utmp_write_entry(li);
346 wtmp_write_entry(li);
349 utmpx_write_entry(li);
352 wtmpx_write_entry(li);
359 ** getlast_entry: Call low-level functions to retrieve the last login
363 /* take the uid in li and return the last login time */
365 getlast_entry(struct logininfo *li)
368 if (lastlog_get_entry(li))
375 /* Try to retrieve the last login time from wtmp */
376 # if defined(USE_WTMP) && (defined(HAVE_TIME_IN_UTMP) || defined(HAVE_TV_IN_UTMP))
377 /* retrieve last login time from utmp */
378 if (wtmp_get_entry(li))
384 /* If wtmp isn't available, try wtmpx */
386 # if defined(USE_WTMPX) && (defined(HAVE_TIME_IN_UTMPX) || defined(HAVE_TV_IN_UTMPX))
387 /* retrieve last login time from utmpx */
388 if (wtmpx_get_entry(li))
394 /* Give up: No means of retrieving last login time */
405 * 'line' string utility functions
407 * These functions process the 'line' string into one of three forms:
409 * 1. The full filename (including '/dev')
410 * 2. The stripped name (excluding '/dev')
411 * 3. The abbreviated name (e.g. /dev/ttyp00 -> yp00
412 * /dev/pts/1 -> ts/1 )
414 * Form 3 is used on some systems to identify a .tmp.? entry when
415 * attempting to remove it. Typically both addition and removal is
416 * performed by one application - say, sshd - so as long as the choice
417 * uniquely identifies a terminal it's ok.
421 /* line_fullname(): add the leading '/dev/' if it doesn't exist make
422 * sure dst has enough space, if not just copy src (ugh) */
424 line_fullname(char *dst, const char *src, int dstsize)
426 memset(dst, '\0', dstsize);
427 if ((strncmp(src, "/dev/", 5) == 0) || (dstsize < (strlen(src) + 5)))
428 strlcpy(dst, src, dstsize);
430 strlcpy(dst, "/dev/", 5);
431 strlcat(dst, src, dstsize);
437 /* line_stripname(): strip the leading '/dev' if it exists, return dst */
439 line_stripname(char *dst, const char *src, int dstsize)
441 memset(dst, '\0', dstsize);
442 if (strncmp(src, "/dev/", 5) == 0)
443 strlcpy(dst, &src[5], dstsize);
445 strlcpy(dst, src, dstsize);
450 /* line_abbrevname(): Return the abbreviated (usually four-character)
451 * form of the line (Just use the last <dstsize> characters of the
454 * NOTE: use strncpy because we do NOT necessarily want zero
457 line_abbrevname(char *dst, const char *src, int dstsize) {
458 memset(dst, '\0', dstsize);
459 src += (strlen(src) - dstsize);
460 strncpy(dst, src, dstsize); /* note: _don't_ change this to strlcpy */
466 ** utmp utility functions
468 ** These functions manipulate struct utmp, taking system differences
472 #if defined(USE_UTMP) || defined (USE_WTMP) || defined (USE_LOGIN)
474 /* build the utmp structure */
476 set_utmp_time(struct logininfo *li, struct utmp *ut)
478 #ifdef HAVE_TV_IN_UTMP
479 ut->ut_tv.tv_sec = li->tv_sec;
480 ut->ut_tv.tv_usec = li->tv_usec;
482 # ifdef HAVE_TIME_IN_UTMP
483 ut->ut_time = li->tv_sec;
490 construct_utmp(struct logininfo *li,
493 memset(ut, '\0', sizeof(struct utmp));
494 #ifdef HAVE_ID_IN_UTMP
495 line_abbrevname(ut->ut_id, li->line, sizeof(ut->ut_id));
498 #ifdef HAVE_TYPE_IN_UTMP
499 /* This is done here to keep utmp constants out of login.h */
502 ut->ut_type = USER_PROCESS;
505 ut->ut_type = DEAD_PROCESS;
510 #ifdef HAVE_PID_IN_UTMP
511 ut->ut_pid = li->pid;
513 line_stripname(ut->ut_line, li->line, sizeof(ut->ut_line));
514 strlcpy(ut->ut_name, li->username, sizeof(ut->ut_name));
515 set_utmp_time(li, ut);
516 #ifdef HAVE_HOST_IN_UTMP
517 strlcpy(ut->ut_host, li->hostname, sizeof(ut->ut_host));
519 #ifdef HAVE_ADDR_IN_UTMP
520 /* this is just a 32-bit IP address */
521 if (li->hostaddr.sa.sa_family == AF_INET)
522 ut->ut_addr = li->hostaddr.sa_in.sin_addr.s_addr;
527 /* USE_UTMP || USE_WTMP || USE_LOGIN */
532 ** utmpx utility functions
534 ** These functions manipulate struct utmpx, accounting for system
538 #if defined(USE_UTMPX) || defined (USE_WTMPX)
540 /* build the utmpx structure */
542 set_utmpx_time(struct logininfo *li, struct utmpx *utx)
544 #ifdef HAVE_TV_IN_UTMPX
545 utx->ut_tv.tv_sec = li->tv_sec;
546 utx->ut_tv.tv_usec = li->tv_usec;
548 # ifdef HAVE_TIME_IN_UTMPX
549 utx->ut_time = li->tv_sec;
556 construct_utmpx(struct logininfo *li, struct utmpx *utx)
558 memset(utx, '\0', sizeof(struct utmpx));
559 line_abbrevname(utx->ut_id, li->line, sizeof(utx->ut_id));
561 /* this is done here to keep utmp constants out of loginrec.h */
564 utx->ut_type = USER_PROCESS;
567 utx->ut_type = DEAD_PROCESS;
570 utx->ut_pid = li->pid;
571 line_stripname(utx->ut_line, li->line, sizeof(utx->ut_line));
572 strlcpy(utx->ut_name, li->username, sizeof(utx->ut_name));
573 set_utmpx_time(li, utx);
574 #ifdef HAVE_HOST_IN_UTMPX
575 strlcpy(utx->ut_host, li->hostname, sizeof(utx->ut_host));
577 #ifdef HAVE_ADDR_IN_UTMPX
578 /* FIXME: (ATL) not supported yet */
580 #ifdef HAVE_SYSLEN_IN_UTMPX
581 /* this is safe because of the extra nulls in logininfo */
582 utx->ut_syslen = strlen(li->hostname);
587 /* USE_UTMPX || USE_WTMPX */
592 ** Low-level utmp functions
595 /* FIXME: (ATL) utmp_write_direct needs testing */
599 /* if we can, use pututline() etc. */
600 #if !defined(DISABLE_PUTUTLINE) && defined(HAVE_SETUTENT) && \
601 defined(HAVE_PUTUTLINE)
602 # define UTMP_USE_LIBRARY
606 /* write a utmp entry with the system's help (pututline() and pals) */
607 #ifdef UTMP_USE_LIBRARY
609 utmp_write_library(struct logininfo *li, struct utmp *ut)
622 /* write a utmp entry direct to the file */
623 /* This is a slightly modification of code in OpenBSD's login.c */
625 utmp_write_direct(struct logininfo *li, struct utmp *ut)
631 tty = ttyslot(); /* seems only to work for /dev/ttyp? style names */
633 if (tty > 0 && (fd = open(UTMP_FILE, O_RDWR|O_CREAT, 0644)) >= 0) {
634 (void)lseek(fd, (off_t)(tty * sizeof(struct utmp)), SEEK_SET);
636 * Prevent luser from zero'ing out ut_host.
637 * If the new ut_line is empty but the old one is not
638 * and ut_line and ut_name match, preserve the old ut_line.
640 if ( read(fd, &old_ut, sizeof(struct utmp)) == sizeof(struct utmp)
641 && ut->ut_host[0] == '\0'
642 && old_ut.ut_host[0] != '\0'
643 && strncmp(old_ut.ut_line, ut->ut_line, sizeof(ut->ut_line)) == 0
644 && strncmp(old_ut.ut_name, ut->ut_name, sizeof(ut->ut_name)) == 0 )
645 (void)memcpy(ut->ut_host, old_ut.ut_host, sizeof(ut->ut_host));
647 (void)lseek(fd, (off_t)(tty * sizeof(struct utmp)), SEEK_SET);
648 if (write(fd, ut, sizeof(struct utmp))==-1)
649 log("utmp_write_direct: error writing %s: %s",
650 UTMP_FILE, strerror(errno));
657 #endif /* UTMP_USE_LIBRARY */
661 utmp_perform_login(struct logininfo *li)
665 construct_utmp(li, &ut);
666 #ifdef UTMP_USE_LIBRARY
667 if (!utmp_write_library(li, &ut)) {
668 log("utmp_perform_login: utmp_write_library() failed");
672 if (!utmp_write_direct(li, &ut)) {
673 log("utmp_perform_login: utmp_write_direct() failed");
682 utmp_perform_logout(struct logininfo *li)
686 memset(&ut, '\0', sizeof(ut));
687 set_utmp_time(li, &ut);
688 line_stripname(ut.ut_line, li->line, sizeof(ut.ut_line));
689 #ifdef HAVE_ID_IN_UTMP
690 line_abbrevname(ut.ut_id, li->line, sizeof(ut.ut_id));
692 #ifdef HAVE_TYPE_IN_UTMP
693 ut.ut_type = DEAD_PROCESS;
696 #if !defined(DISABLE_PUTUTLINE) \
697 && defined(HAVE_SETUTENT) && defined(HAVE_PUTUTLINE)
698 utmp_write_library(li, &ut);
700 utmp_write_direct(li, &ut);
708 utmp_write_entry(struct logininfo *li)
712 return utmp_perform_login(li);
715 return utmp_perform_logout(li);
718 log("utmp_write_entry: invalid type field");
729 ** Low-level utmpx functions
732 /* not much point if we don't want utmpx entries */
735 /* if we have the wherewithall, use pututxline etc. */
736 #if !defined(DISABLE_PUTUTXLINE) && defined(HAVE_SETUTXENT) \
737 && defined(HAVE_PUTUTXLINE)
738 # define UTMPX_USE_LIBRARY
742 /* write a utmpx entry with the system's help (pututxline() and pals) */
743 #ifdef UTMPX_USE_LIBRARY
745 utmpx_write_library(struct logininfo *li, struct utmpx *utx)
750 #ifdef HAVE_ENDUTXENT
757 /* UTMPX_USE_LIBRARY */
760 /* write a utmp entry direct to the file */
762 utmpx_write_direct(struct logininfo *li, struct utmpx *utx)
764 log("utmpx_write_direct: not implemented!");
769 /* UTMPX_USE_LIBRARY */
772 utmpx_perform_login(struct logininfo *li)
776 construct_utmpx(li, &utx);
777 #ifdef UTMPX_USE_LIBRARY
778 if (!utmpx_write_library(li, &utx)) {
779 log("utmpx_perform_login: utmp_write_library() failed");
783 if (!utmpx_write_direct(li, &ut)) {
784 log("utmpx_perform_login: utmp_write_direct() failed");
793 utmpx_perform_logout(struct logininfo *li)
797 memset(&utx, '\0', sizeof(utx));
798 set_utmpx_time(li, &utx);
799 line_stripname(utx.ut_line, li->line, sizeof(utx.ut_line));
800 #ifdef HAVE_ID_IN_UTMPX
801 line_abbrevname(utx.ut_id, li->line, sizeof(utx.ut_id));
803 #ifdef HAVE_TYPE_IN_UTMPX
804 utx.ut_type = DEAD_PROCESS;
807 #ifdef UTMPX_USE_LIBRARY
808 utmpx_write_library(li, &utx);
810 utmpx_write_direct(li, &utx);
817 utmpx_write_entry(struct logininfo *li)
821 return utmpx_perform_login(li);
823 return utmpx_perform_logout(li);
825 log("utmpx_write_entry: invalid type field");
836 ** Low-level wtmp functions
841 /* write a wtmp entry direct to the end of the file */
842 /* This is a slight modification of code in OpenBSD's logwtmp.c */
844 wtmp_write(struct logininfo *li, struct utmp *ut)
849 if ((fd = open(WTMP_FILE, O_WRONLY|O_APPEND, 0)) < 0) {
850 log("wtmp_write: problem writing %s: %s",
851 WTMP_FILE, strerror(errno));
854 if (fstat(fd, &buf) == 0)
855 if (write(fd, (char *)ut, sizeof(struct utmp)) !=
856 sizeof(struct utmp)) {
857 ftruncate(fd, buf.st_size);
858 log("wtmp_write: problem writing %s: %s",
859 WTMP_FILE, strerror(errno));
868 wtmp_perform_login(struct logininfo *li){
871 construct_utmp(li, &ut);
872 return wtmp_write(li, &ut);
877 wtmp_perform_logout(struct logininfo *li)
881 construct_utmp(li, &ut);
882 /* blank out unnecessary fields */
883 memset(&(ut.ut_name), '\0', sizeof(ut.ut_name));
884 #ifdef HAVE_ID_IN_UTMP
885 memset(&(ut.ut_id), '\0', sizeof(ut.ut_id));
887 #ifdef HAVE_HOST_IN_UTMP
888 memset(&(ut.ut_host), '\0', sizeof(ut.ut_host));
890 #ifdef HAVE_ADDR_IN_UTMP
891 memset(&(ut.ut_addr), '\0', sizeof(ut.ut_addr));
893 return wtmp_write(li, &ut);
898 wtmp_write_entry(struct logininfo *li)
902 return wtmp_perform_login(li);
904 return wtmp_perform_logout(li);
906 log("wtmp_write_entry: invalid type field");
913 wtmp_get_entry(struct logininfo *li)
919 if ((fd = open(WTMP_FILE, O_RDONLY)) < 0) {
920 log("wtmp_get_entry: problem opening %s: %s",
921 WTMP_FILE, strerror(errno));
924 if (fstat(fd, &st) != 0) {
925 log("wtmp_get_entry: couldn't stat %s: %s",
926 WTMP_FILE, strerror(errno));
930 (void)lseek(fd, (off_t)(0-sizeof(struct utmp)), SEEK_END);
933 if (read(fd, &ut, sizeof(ut)) != sizeof(ut)) {
934 log("wtmp_get_entry: read of %s failed: %s",
935 WTMP_FILE, strerror(errno));
939 /* Logouts are recorded as a blank username on a particular line.
940 * So, we just need to find the username in struct utmp */
941 if ( strncmp(li->username, ut.ut_user, 8) == 0 ) {
942 /* note we've already made sure there's a time in struct utmp */
943 #ifdef HAVE_TIME_IN_UTMP
944 li->tv_sec = ut.ut_time;
947 li->tv_sec = ut.ut_tv.tv_sec;
950 line_fullname(li->line, ut.ut_line, sizeof(ut.ut_line));
951 #ifdef HAVE_HOST_IN_UTMP
952 strlcpy(li->hostname, ut.ut_host, sizeof(ut.ut_host));
955 if (lseek(fd, (off_t)(0-2*sizeof(struct utmp)), SEEK_CUR) == -1) {
959 } while (li->tv_sec == 0);
970 ** Low-level wtmpx functions
975 /* write a wtmpx entry direct to the end of the file */
976 /* This is a slight modification of code in OpenBSD's logwtmp.c */
978 wtmpx_write(struct logininfo *li, struct utmpx *utx)
983 if ((fd = open(WTMPX_FILE, O_WRONLY|O_APPEND, 0)) < 0) {
984 log("wtmpx_write: problem opening %s: %s",
985 WTMPX_FILE, strerror(errno));
989 if (fstat(fd, &buf) == 0)
990 if (write(fd, (char *)utx, sizeof(struct utmpx)) !=
991 sizeof(struct utmpx)) {
992 ftruncate(fd, buf.st_size);
993 log("wtmpx_write: problem writing %s: %s",
994 WTMPX_FILE, strerror(errno));
1004 wtmpx_perform_login(struct logininfo *li)
1008 construct_utmpx(li, &utx);
1009 return wtmpx_write(li, &utx);
1014 wtmpx_perform_logout(struct logininfo *li)
1018 construct_utmpx(li, &utx);
1019 /* blank out unnecessary fields */
1020 memset(&(utx.ut_name), '\0', sizeof(utx.ut_name));
1021 #ifdef HAVE_ID_IN_UTMPX
1022 memset(&(utx.ut_id), '\0', sizeof(utx.ut_id));
1024 #ifdef HAVE_HOST_IN_UTMPX
1025 memset(&(utx.ut_host), '\0', sizeof(utx.ut_host));
1027 #ifdef HAVE_ADDR_IN_UTMPX
1028 memset(&(utx.ut_addr), '\0', sizeof(utx.ut_addr));
1030 return wtmpx_write(li, &utx);
1036 wtmpx_write_entry(struct logininfo *li)
1040 return wtmpx_perform_login(li);
1042 return wtmpx_perform_logout(li);
1044 log("wtmpx_write_entry: invalid type field");
1051 wtmpx_get_entry(struct logininfo *li)
1057 if ((fd = open(WTMPX_FILE, O_RDONLY)) < 0) {
1058 log("wtmpx_get_entry: problem opening %s: %s",
1059 WTMPX_FILE, strerror(errno));
1062 if (fstat(fd, &st) != 0) {
1063 log("wtmpx_get_entry: couldn't stat %s: %s",
1064 WTMP_FILE, strerror(errno));
1068 (void)lseek(fd, (off_t)(0-sizeof(struct utmpx)), SEEK_END);
1071 if (read(fd, &utx, sizeof(utx)) != sizeof(utx)) {
1072 log("wtmpx_get_entry: read of %s failed: %s",
1073 WTMPX_FILE, strerror(errno));
1077 /* Logouts are recorded as a blank username on a particular line.
1078 * So, we just need to find the username in struct utmpx */
1079 if ( strncmp(li->username, utx.ut_user, 8) == 0 ) {
1080 /* note we've already made sure there's a time in struct utmp */
1081 #ifdef HAVE_TV_IN_UTMPX
1082 li->tv_sec = utx.ut_tv.tv_sec;
1084 # ifdef HAVE_TIME_IN_UTMPX
1085 li->tv_sec = utx.ut_time;
1088 line_fullname(li->line, utx.ut_line, sizeof(utx.ut_line));
1089 #ifdef HAVE_HOST_IN_UTMPX
1090 strlcpy(li->hostname, utx.ut_host, sizeof(utx.ut_line));
1093 if (lseek(fd, (off_t)(0-2*sizeof(struct utmpx)), SEEK_CUR) == -1) {
1097 } while (li->tv_sec == 0);
1102 #endif /* USE_WTMPX */
1106 ** Low-level libutil login() functions
1112 syslogin_perform_login(struct logininfo *li)
1116 if (! (ut = (struct utmp *)malloc(sizeof(struct utmp)))) {
1117 log("syslogin_perform_login: couldn't malloc()");
1120 construct_utmp(li, ut);
1128 syslogin_perform_logout(struct logininfo *li)
1133 (void)line_stripname(line, li->line, sizeof(line));
1135 if (!logout(line)) {
1136 log("syslogin_perform_logout: logout() returned an error");
1137 # ifdef HAVE_LOGWTMP
1139 logwtmp(line, "", "");
1142 /* TODO: what to do if we have login, but no logout?
1143 * what if logout but no logwtmp? All routines are in libutil
1144 * so they should all be there, but... */
1151 syslogin_write_entry(struct logininfo *li)
1155 return syslogin_perform_login(li);
1157 return syslogin_perform_logout(li);
1159 log("syslogin_write_entry: Invalid type field");
1165 #endif /* USE_LOGIN */
1167 /* end of file log-syslogin.c */
1171 ** Low-level lastlog functions
1177 lastlog_construct(struct logininfo *li, struct lastlog *last)
1179 /* clear the structure */
1180 memset(last, '\0', sizeof(struct lastlog));
1182 (void)line_stripname(last->ll_line, li->line,
1183 sizeof(last->ll_line));
1184 strlcpy(last->ll_host, li->hostname, sizeof(last->ll_host));
1185 last->ll_time = li->tv_sec;
1194 lastlog_filetype(char *filename)
1198 if ( stat(LASTLOG_FILE, &st) != 0) {
1199 log("lastlog_perform_login: Couldn't stat %s: %s",
1200 LASTLOG_FILE, strerror(errno));
1203 if (S_ISDIR(st.st_mode))
1205 else if (S_ISREG(st.st_mode))
1212 /* open the file (using filemode) and seek to the login entry */
1214 lastlog_openseek(struct logininfo *li, int *fd, int filemode)
1218 char lastlog_file[1024];
1220 type = lastlog_filetype(LASTLOG_FILE);
1223 strlcpy(lastlog_file, LASTLOG_FILE, sizeof(lastlog_file));
1226 snprintf(lastlog_file, sizeof(lastlog_file), "%s/%s",
1227 LASTLOG_FILE, li->username);
1230 log("lastlog_openseek: %.100s is not a file or directory!",
1235 *fd = open(lastlog_file, filemode);
1237 log("lastlog_openseek: Couldn't open %s: %s",
1238 lastlog_file, strerror(errno));
1241 /* find this uid's offset in the lastlog file */
1242 offset = (off_t) ( (long)li->uid * sizeof(struct lastlog));
1244 if ( lseek(*fd, offset, SEEK_SET) != offset ) {
1245 log("lastlog_openseek: %s->lseek(): %s",
1246 lastlog_file, strerror(errno));
1253 lastlog_perform_login(struct logininfo *li)
1255 struct lastlog last;
1258 /* create our struct lastlog */
1259 lastlog_construct(li, &last);
1261 /* write the entry */
1262 if (lastlog_openseek(li, &fd, O_RDWR)) {
1263 if ( write(fd, &last, sizeof(struct lastlog))
1264 != sizeof(struct lastlog) ) {
1265 log("lastlog_write_filemode: Error writing to %s: %s",
1266 LASTLOG_FILE, strerror(errno));
1276 lastlog_write_entry(struct logininfo *li)
1280 return lastlog_perform_login(li);
1282 log("lastlog_write_entry: Invalid type field");
1289 lastlog_populate_entry(struct logininfo *li, struct lastlog *last)
1291 line_fullname(li->line, last->ll_line, sizeof(li->line));
1292 strlcpy(li->hostname, last->ll_host, sizeof(li->hostname));
1293 li->tv_sec = last->ll_time;
1298 lastlog_get_entry(struct logininfo *li)
1300 struct lastlog last;
1303 if (lastlog_openseek(li, &fd, O_RDONLY)) {
1304 if ( read(fd, &last, sizeof(struct lastlog))
1305 != sizeof(struct lastlog) ) {
1306 log("lastlog_write_filemode: Error reading from %s: %s",
1307 LASTLOG_FILE, strerror(errno));
1310 lastlog_populate_entry(li, &last);
1318 #endif /* USE_LASTLOG */