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()
142 ** Linux (Redhat 6.2, Debian)
144 ** HP-UX 10.20 (gcc only)
146 ** NeXT - M68k/HPPA/Sparc (4.2/3.3)
148 ** Testing required: Please send reports!
153 ** Platforms with known problems:
154 ** Some variants of Slackware Linux
158 #include "includes.h"
162 #include "loginrec.h"
171 ** prototypes for helper functions in this file
175 void set_utmp_time(struct logininfo *li, struct utmp *ut);
176 void construct_utmp(struct logininfo *li, struct utmp *ut);
180 void set_utmpx_time(struct logininfo *li, struct utmpx *ut);
181 void construct_utmpx(struct logininfo *li, struct utmpx *ut);
184 int utmp_write_entry(struct logininfo *li);
185 int utmpx_write_entry(struct logininfo *li);
186 int wtmp_write_entry(struct logininfo *li);
187 int wtmpx_write_entry(struct logininfo *li);
188 int lastlog_write_entry(struct logininfo *li);
189 int syslogin_write_entry(struct logininfo *li);
191 int getlast_entry(struct logininfo *li);
192 int lastlog_get_entry(struct logininfo *li);
193 int wtmp_get_entry(struct logininfo *li);
194 int wtmpx_get_entry(struct logininfo *li);
196 /* pick the shortest string */
197 #define MIN_SIZEOF(s1,s2) ( sizeof(s1) < sizeof(s2) ? sizeof(s1) : sizeof(s2) )
200 ** platform-independent login functions
203 /* login_login(struct logininfo *) -Record a login
205 * Call with a pointer to a struct logininfo initialised with
206 * login_init_entry() or login_alloc_entry()
210 * 0 on failure (will use OpenSSH's logging facilities for diagnostics)
213 login_login (struct logininfo *li)
215 li->type = LTYPE_LOGIN;
216 return login_write(li);
220 /* login_logout(struct logininfo *) - Record a logout
222 * Call as with login_login()
226 * 0 on failure (will use OpenSSH's logging facilities for diagnostics)
229 login_logout(struct logininfo *li)
231 li->type = LTYPE_LOGOUT;
232 return login_write(li);
235 /* login_get_lastlog_time(int) - Retrieve the last login time
237 * Retrieve the last login time for the given uid. Will try to use the
238 * system lastlog facilities if they are available, but will fall back
239 * to looking in wtmp/wtmpx if necessary
242 * 0 on failure, or if user has never logged in
243 * Time in seconds from the epoch if successful
245 * Useful preprocessor symbols:
246 * DISABLE_LASTLOG: If set, *never* even try to retrieve lastlog
248 * USE_LASTLOG: If set, indicates the presence of system lastlog
249 * facilities. If this and DISABLE_LASTLOG are not set,
250 * try to retrieve lastlog information from wtmp/wtmpx.
253 login_get_lastlog_time(const int uid)
257 if (login_get_lastlog(&li, uid))
263 /* login_get_lastlog(struct logininfo *, int) - Retrieve a lastlog entry
265 * Retrieve a logininfo structure populated (only partially) with
266 * information from the system lastlog data, or from wtmp/wtmpx if no
267 * system lastlog information exists.
269 * Note this routine must be given a pre-allocated logininfo.
272 * >0: A pointer to your struct logininfo if successful
273 * 0 on failure (will use OpenSSH's logging facilities for diagnostics)
277 login_get_lastlog(struct logininfo *li, const int uid)
281 memset(li, '\0', sizeof(*li));
285 * If we don't have a 'real' lastlog, we need the username to
286 * reliably search wtmp(x) for the last login (see
291 fatal("login_get_lastlog: Cannot find account for uid %i", uid);
293 /* No MIN_SIZEOF here - we absolutely *must not* truncate the
295 strlcpy(li->username, pw->pw_name, sizeof(li->username));
297 if (getlast_entry(li))
304 /* login_alloc_entry(int, char*, char*, char*) - Allocate and initialise
305 * a logininfo structure
307 * This function creates a new struct logininfo, a data structure
308 * meant to carry the information required to portably record login info.
310 * Returns a pointer to a newly created struct logininfo. If memory
311 * allocation fails, the program halts.
314 logininfo *login_alloc_entry(int pid, const char *username,
315 const char *hostname, const char *line)
317 struct logininfo *newli;
319 newli = (struct logininfo *) xmalloc (sizeof(*newli));
320 (void)login_init_entry(newli, pid, username, hostname, line);
325 /* login_free_entry(struct logininfo *) - free struct memory */
327 login_free_entry(struct logininfo *li)
333 /* login_init_entry(struct logininfo *, int, char*, char*, char*)
334 * - initialise a struct logininfo
336 * Populates a new struct logininfo, a data structure meant to carry
337 * the information required to portably record login info.
342 login_init_entry(struct logininfo *li, int pid, const char *username,
343 const char *hostname, const char *line)
347 memset(li, 0, sizeof(*li));
351 /* set the line information */
353 line_fullname(li->line, line, sizeof(li->line));
356 strlcpy(li->username, username, sizeof(li->username));
357 pw = getpwnam(li->username);
359 fatal("login_init_entry: Cannot find user \"%s\"", li->username);
360 li->uid = pw->pw_uid;
364 strlcpy(li->hostname, hostname, sizeof(li->hostname));
369 /* login_set_current_time(struct logininfo *) - set the current time
371 * Set the current time in a logininfo structure. This function is
372 * meant to eliminate the need to deal with system dependencies for
376 login_set_current_time(struct logininfo *li)
380 gettimeofday(&tv, NULL);
382 li->tv_sec = tv.tv_sec;
383 li->tv_usec = tv.tv_usec;
386 /* copy a sockaddr_* into our logininfo */
388 login_set_addr(struct logininfo *li, const struct sockaddr *sa,
389 const unsigned int sa_size)
391 unsigned int bufsize = sa_size;
393 /* make sure we don't overrun our union */
394 if (sizeof(li->hostaddr) < sa_size)
395 bufsize = sizeof(li->hostaddr);
397 memcpy((void *)&(li->hostaddr.sa), (const void *)sa, bufsize);
402 ** login_write: Call low-level recording functions based on autoconf
406 login_write (struct logininfo *li)
409 if ((int)geteuid() != 0) {
410 log("Attempt to write login records by non-root user (aborting)");
415 /* set the timestamp */
416 login_set_current_time(li);
418 syslogin_write_entry(li);
421 if (li->type == LTYPE_LOGIN) {
422 lastlog_write_entry(li);
426 utmp_write_entry(li);
429 wtmp_write_entry(li);
432 utmpx_write_entry(li);
435 wtmpx_write_entry(li);
441 ** getlast_entry: Call low-level functions to retrieve the last login
445 /* take the uid in li and return the last login time */
447 getlast_entry(struct logininfo *li)
450 return(lastlog_get_entry(li));
451 #else /* !USE_LASTLOG */
453 #ifdef DISABLE_LASTLOG
454 /* On some systems we shouldn't even try to obtain last login
457 # else /* DISABLE_LASTLOG */
458 /* Try to retrieve the last login time from wtmp */
459 # if defined(USE_WTMP) && (defined(HAVE_TIME_IN_UTMP) || defined(HAVE_TV_IN_UTMP))
460 /* retrieve last login time from utmp */
461 return (wtmp_get_entry(li));
462 # else /* defined(USE_WTMP) && (defined(HAVE_TIME_IN_UTMP) || defined(HAVE_TV_IN_UTMP)) */
463 /* If wtmp isn't available, try wtmpx */
464 # if defined(USE_WTMPX) && (defined(HAVE_TIME_IN_UTMPX) || defined(HAVE_TV_IN_UTMPX))
465 /* retrieve last login time from utmpx */
466 return (wtmpx_get_entry(li));
468 /* Give up: No means of retrieving last login time */
470 # endif /* USE_WTMPX && (HAVE_TIME_IN_UTMPX || HAVE_TV_IN_UTMPX) */
471 # endif /* USE_WTMP && (HAVE_TIME_IN_UTMP || HAVE_TV_IN_UTMP) */
472 # endif /* DISABLE_LASTLOG */
473 #endif /* USE_LASTLOG */
479 * 'line' string utility functions
481 * These functions process the 'line' string into one of three forms:
483 * 1. The full filename (including '/dev')
484 * 2. The stripped name (excluding '/dev')
485 * 3. The abbreviated name (e.g. /dev/ttyp00 -> yp00
486 * /dev/pts/1 -> ts/1 )
488 * Form 3 is used on some systems to identify a .tmp.? entry when
489 * attempting to remove it. Typically both addition and removal is
490 * performed by one application - say, sshd - so as long as the choice
491 * uniquely identifies a terminal it's ok.
495 /* line_fullname(): add the leading '/dev/' if it doesn't exist make
496 * sure dst has enough space, if not just copy src (ugh) */
498 line_fullname(char *dst, const char *src, int dstsize)
500 memset(dst, '\0', dstsize);
501 if ((strncmp(src, "/dev/", 5) == 0) || (dstsize < (strlen(src) + 5))) {
502 strlcpy(dst, src, dstsize);
504 strlcpy(dst, "/dev/", dstsize);
505 strlcat(dst, src, dstsize);
510 /* line_stripname(): strip the leading '/dev' if it exists, return dst */
512 line_stripname(char *dst, const char *src, int dstsize)
514 memset(dst, '\0', dstsize);
516 if (strncmp(src, "/dev/tty", 8) == 0)
517 strlcpy(dst, src + 8, dstsize);
519 if (strncmp(src, "/dev/", 5) == 0)
520 strlcpy(dst, src + 5, dstsize);
523 strlcpy(dst, src, dstsize);
527 /* line_abbrevname(): Return the abbreviated (usually four-character)
528 * form of the line (Just use the last <dstsize> characters of the
531 * NOTE: use strncpy because we do NOT necessarily want zero
534 line_abbrevname(char *dst, const char *src, int dstsize)
538 memset(dst, '\0', dstsize);
540 /* Always skip prefix if present */
542 if (strncmp(src, "/dev/tty", 8) == 0)
545 if (strncmp(src, "/dev/", 5) == 0)
552 if (((int)len - dstsize) > 0)
553 src += ((int)len - dstsize);
555 /* note: _don't_ change this to strlcpy */
556 strncpy(dst, src, (size_t)dstsize);
563 ** utmp utility functions
565 ** These functions manipulate struct utmp, taking system differences
569 #if defined(USE_UTMP) || defined (USE_WTMP) || defined (USE_LOGIN)
571 /* build the utmp structure */
573 set_utmp_time(struct logininfo *li, struct utmp *ut)
575 # ifdef HAVE_TV_IN_UTMP
576 ut->ut_tv.tv_sec = li->tv_sec;
577 ut->ut_tv.tv_usec = li->tv_usec;
579 # ifdef HAVE_TIME_IN_UTMP
580 ut->ut_time = li->tv_sec;
586 construct_utmp(struct logininfo *li,
589 memset(ut, '\0', sizeof(*ut));
591 /* First fill out fields used for both logins and logouts */
593 # ifdef HAVE_ID_IN_UTMP
594 line_abbrevname(ut->ut_id, li->line, sizeof(ut->ut_id));
597 # ifdef HAVE_TYPE_IN_UTMP
598 /* This is done here to keep utmp constants out of struct logininfo */
601 ut->ut_type = USER_PROCESS;
604 ut->ut_type = DEAD_PROCESS;
608 set_utmp_time(li, ut);
610 line_stripname(ut->ut_line, li->line, sizeof(ut->ut_line));
612 # ifdef HAVE_PID_IN_UTMP
613 ut->ut_pid = li->pid;
616 /* If we're logging out, leave all other fields blank */
617 if (li->type == LTYPE_LOGOUT)
621 * These fields are only used when logging in, and are blank
625 /* Use strncpy because we don't necessarily want null termination */
626 strncpy(ut->ut_name, li->username, MIN_SIZEOF(ut->ut_name, li->username));
627 # ifdef HAVE_HOST_IN_UTMP
628 strncpy(ut->ut_host, li->hostname, MIN_SIZEOF(ut->ut_host, li->hostname));
630 # ifdef HAVE_ADDR_IN_UTMP
631 /* this is just a 32-bit IP address */
632 if (li->hostaddr.sa.sa_family == AF_INET)
633 ut->ut_addr = li->hostaddr.sa_in.sin_addr.s_addr;
636 #endif /* USE_UTMP || USE_WTMP || USE_LOGIN */
639 ** utmpx utility functions
641 ** These functions manipulate struct utmpx, accounting for system
645 #if defined(USE_UTMPX) || defined (USE_WTMPX)
646 /* build the utmpx structure */
648 set_utmpx_time(struct logininfo *li, struct utmpx *utx)
650 # ifdef HAVE_TV_IN_UTMPX
651 utx->ut_tv.tv_sec = li->tv_sec;
652 utx->ut_tv.tv_usec = li->tv_usec;
653 # else /* HAVE_TV_IN_UTMPX */
654 # ifdef HAVE_TIME_IN_UTMPX
655 utx->ut_time = li->tv_sec;
656 # endif /* HAVE_TIME_IN_UTMPX */
657 # endif /* HAVE_TV_IN_UTMPX */
661 construct_utmpx(struct logininfo *li, struct utmpx *utx)
663 memset(utx, '\0', sizeof(*utx));
664 # ifdef HAVE_ID_IN_UTMPX
665 line_abbrevname(utx->ut_id, li->line, sizeof(utx->ut_id));
668 /* this is done here to keep utmp constants out of loginrec.h */
671 utx->ut_type = USER_PROCESS;
674 utx->ut_type = DEAD_PROCESS;
677 line_stripname(utx->ut_line, li->line, sizeof(utx->ut_line));
678 set_utmpx_time(li, utx);
679 utx->ut_pid = li->pid;
681 if (li->type == LTYPE_LOGOUT)
685 * These fields are only used when logging in, and are blank
689 /* strncpy(): Don't necessarily want null termination */
690 strncpy(utx->ut_name, li->username, MIN_SIZEOF(utx->ut_name, li->username));
691 # ifdef HAVE_HOST_IN_UTMPX
692 strncpy(utx->ut_host, li->hostname, MIN_SIZEOF(utx->ut_host, li->hostname));
694 # ifdef HAVE_ADDR_IN_UTMPX
695 /* this is just a 32-bit IP address */
696 if (li->hostaddr.sa.sa_family == AF_INET)
697 utx->ut_addr = li->hostaddr.sa_in.sin_addr.s_addr;
699 # ifdef HAVE_SYSLEN_IN_UTMPX
700 /* ut_syslen is the length of the utx_host string */
701 utx->ut_syslen = MIN(strlen(li->hostname), sizeof(utx->ut_host));
704 #endif /* USE_UTMPX || USE_WTMPX */
707 ** Low-level utmp functions
710 /* FIXME: (ATL) utmp_write_direct needs testing */
713 /* if we can, use pututline() etc. */
714 # if !defined(DISABLE_PUTUTLINE) && defined(HAVE_SETUTENT) && \
715 defined(HAVE_PUTUTLINE)
716 # define UTMP_USE_LIBRARY
720 /* write a utmp entry with the system's help (pututline() and pals) */
721 # ifdef UTMP_USE_LIBRARY
723 utmp_write_library(struct logininfo *li, struct utmp *ut)
728 # ifdef HAVE_ENDUTENT
733 # else /* UTMP_USE_LIBRARY */
735 /* write a utmp entry direct to the file */
736 /* This is a slightly modification of code in OpenBSD's login.c */
738 utmp_write_direct(struct logininfo *li, struct utmp *ut)
744 /* FIXME: (ATL) ttyslot() needs local implementation */
746 #if defined(HAVE_GETTTYENT)
747 register struct ttyent *ty;
752 while ((struct ttyent *)0 != (ty = getttyent())) {
754 if (!strncmp(ty->ty_name, ut->ut_line, sizeof(ut->ut_line)))
759 if((struct ttyent *)0 == ty) {
760 log("utmp_write_entry: tty not found");
765 tty = ttyslot(); /* seems only to work for /dev/ttyp? style names */
767 #endif /* HAVE_GETTTYENT */
769 if (tty > 0 && (fd = open(UTMP_FILE, O_RDWR|O_CREAT, 0644)) >= 0) {
770 (void)lseek(fd, (off_t)(tty * sizeof(struct utmp)), SEEK_SET);
772 * Prevent luser from zero'ing out ut_host.
773 * If the new ut_line is empty but the old one is not
774 * and ut_line and ut_name match, preserve the old ut_line.
776 if (atomicio(read, fd, &old_ut, sizeof(old_ut)) == sizeof(old_ut) &&
777 (ut->ut_host[0] == '\0') && (old_ut.ut_host[0] != '\0') &&
778 (strncmp(old_ut.ut_line, ut->ut_line, sizeof(ut->ut_line)) == 0) &&
779 (strncmp(old_ut.ut_name, ut->ut_name, sizeof(ut->ut_name)) == 0)) {
780 (void)memcpy(ut->ut_host, old_ut.ut_host, sizeof(ut->ut_host));
783 (void)lseek(fd, (off_t)(tty * sizeof(struct utmp)), SEEK_SET);
784 if (atomicio(write, fd, ut, sizeof(*ut)) != sizeof(*ut))
785 log("utmp_write_direct: error writing %s: %s",
786 UTMP_FILE, strerror(errno));
794 # endif /* UTMP_USE_LIBRARY */
797 utmp_perform_login(struct logininfo *li)
801 construct_utmp(li, &ut);
802 # ifdef UTMP_USE_LIBRARY
803 if (!utmp_write_library(li, &ut)) {
804 log("utmp_perform_login: utmp_write_library() failed");
808 if (!utmp_write_direct(li, &ut)) {
809 log("utmp_perform_login: utmp_write_direct() failed");
818 utmp_perform_logout(struct logininfo *li)
822 construct_utmp(li, &ut);
823 # ifdef UTMP_USE_LIBRARY
824 if (!utmp_write_library(li, &ut)) {
825 log("utmp_perform_logout: utmp_write_library() failed");
829 if (!utmp_write_direct(li, &ut)) {
830 log("utmp_perform_logout: utmp_write_direct() failed");
839 utmp_write_entry(struct logininfo *li)
843 return utmp_perform_login(li);
846 return utmp_perform_logout(li);
849 log("utmp_write_entry: invalid type field");
853 #endif /* USE_UTMP */
857 ** Low-level utmpx functions
860 /* not much point if we don't want utmpx entries */
863 /* if we have the wherewithall, use pututxline etc. */
864 # if !defined(DISABLE_PUTUTXLINE) && defined(HAVE_SETUTXENT) && \
865 defined(HAVE_PUTUTXLINE)
866 # define UTMPX_USE_LIBRARY
870 /* write a utmpx entry with the system's help (pututxline() and pals) */
871 # ifdef UTMPX_USE_LIBRARY
873 utmpx_write_library(struct logininfo *li, struct utmpx *utx)
878 # ifdef HAVE_ENDUTXENT
884 # else /* UTMPX_USE_LIBRARY */
886 /* write a utmp entry direct to the file */
888 utmpx_write_direct(struct logininfo *li, struct utmpx *utx)
890 log("utmpx_write_direct: not implemented!");
893 # endif /* UTMPX_USE_LIBRARY */
896 utmpx_perform_login(struct logininfo *li)
900 construct_utmpx(li, &utx);
901 # ifdef UTMPX_USE_LIBRARY
902 if (!utmpx_write_library(li, &utx)) {
903 log("utmpx_perform_login: utmp_write_library() failed");
907 if (!utmpx_write_direct(li, &ut)) {
908 log("utmpx_perform_login: utmp_write_direct() failed");
917 utmpx_perform_logout(struct logininfo *li)
921 memset(&utx, '\0', sizeof(utx));
922 set_utmpx_time(li, &utx);
923 line_stripname(utx.ut_line, li->line, sizeof(utx.ut_line));
924 # ifdef HAVE_ID_IN_UTMPX
925 line_abbrevname(utx.ut_id, li->line, sizeof(utx.ut_id));
927 # ifdef HAVE_TYPE_IN_UTMPX
928 utx.ut_type = DEAD_PROCESS;
931 # ifdef UTMPX_USE_LIBRARY
932 utmpx_write_library(li, &utx);
934 utmpx_write_direct(li, &utx);
940 utmpx_write_entry(struct logininfo *li)
944 return utmpx_perform_login(li);
946 return utmpx_perform_logout(li);
948 log("utmpx_write_entry: invalid type field");
952 #endif /* USE_UTMPX */
956 ** Low-level wtmp functions
961 /* write a wtmp entry direct to the end of the file */
962 /* This is a slight modification of code in OpenBSD's logwtmp.c */
964 wtmp_write(struct logininfo *li, struct utmp *ut)
969 if ((fd = open(WTMP_FILE, O_WRONLY|O_APPEND, 0)) < 0) {
970 log("wtmp_write: problem writing %s: %s",
971 WTMP_FILE, strerror(errno));
974 if (fstat(fd, &buf) == 0)
975 if (atomicio(write, fd, ut, sizeof(*ut)) != sizeof(*ut)) {
976 ftruncate(fd, buf.st_size);
977 log("wtmp_write: problem writing %s: %s",
978 WTMP_FILE, strerror(errno));
986 wtmp_perform_login(struct logininfo *li)
990 construct_utmp(li, &ut);
991 return wtmp_write(li, &ut);
996 wtmp_perform_logout(struct logininfo *li)
1000 construct_utmp(li, &ut);
1001 return wtmp_write(li, &ut);
1006 wtmp_write_entry(struct logininfo *li)
1010 return wtmp_perform_login(li);
1012 return wtmp_perform_logout(li);
1014 log("wtmp_write_entry: invalid type field");
1020 /* Notes on fetching login data from wtmp/wtmpx
1022 * Logouts are usually recorded with (amongst other things) a blank
1023 * username on a given tty line. However, some systems (HP-UX is one)
1024 * leave all fields set, but change the ut_type field to DEAD_PROCESS.
1026 * Since we're only looking for logins here, we know that the username
1027 * must be set correctly. On systems that leave it in, we check for
1028 * ut_type==USER_PROCESS (indicating a login.)
1030 * Portability: Some systems may set something other than USER_PROCESS
1031 * to indicate a login process. I don't know of any as I write. Also,
1032 * it's possible that some systems may both leave the username in
1033 * place and not have ut_type.
1036 /* return true if this wtmp entry indicates a login */
1038 wtmp_islogin(struct logininfo *li, struct utmp *ut)
1040 if (strncmp(li->username, ut->ut_name,
1041 MIN_SIZEOF(li->username, ut->ut_name)) == 0) {
1042 # ifdef HAVE_TYPE_IN_UTMP
1043 if (ut->ut_type & USER_PROCESS)
1053 wtmp_get_entry(struct logininfo *li)
1059 /* Clear the time entries in our logininfo */
1060 li->tv_sec = li->tv_usec = 0;
1062 if ((fd = open(WTMP_FILE, O_RDONLY)) < 0) {
1063 log("wtmp_get_entry: problem opening %s: %s",
1064 WTMP_FILE, strerror(errno));
1067 if (fstat(fd, &st) != 0) {
1068 log("wtmp_get_entry: couldn't stat %s: %s",
1069 WTMP_FILE, strerror(errno));
1074 /* Seek to the start of the last struct utmp */
1075 if (lseek(fd, (off_t)(0 - sizeof(struct utmp)), SEEK_END) == -1) {
1076 /* Looks like we've got a fresh wtmp file */
1082 if (atomicio(read, fd, &ut, sizeof(ut)) != sizeof(ut)) {
1083 log("wtmp_get_entry: read of %s failed: %s",
1084 WTMP_FILE, strerror(errno));
1088 if ( wtmp_islogin(li, &ut) ) {
1090 /* We've already checked for a time in struct
1091 * utmp, in login_getlast(). */
1092 # ifdef HAVE_TIME_IN_UTMP
1093 li->tv_sec = ut.ut_time;
1095 # if HAVE_TV_IN_UTMP
1096 li->tv_sec = ut.ut_tv.tv_sec;
1099 line_fullname(li->line, ut.ut_line,
1100 MIN_SIZEOF(li->line, ut.ut_line));
1101 # ifdef HAVE_HOST_IN_UTMP
1102 strlcpy(li->hostname, ut.ut_host,
1103 MIN_SIZEOF(li->hostname, ut.ut_host));
1107 /* Seek back 2 x struct utmp */
1108 if (lseek(fd, (off_t)(0-2*sizeof(struct utmp)), SEEK_CUR) == -1) {
1109 /* We've found the start of the file, so quit */
1115 /* We found an entry. Tidy up and return */
1119 # endif /* USE_WTMP */
1123 ** Low-level wtmpx functions
1127 /* write a wtmpx entry direct to the end of the file */
1128 /* This is a slight modification of code in OpenBSD's logwtmp.c */
1130 wtmpx_write(struct logininfo *li, struct utmpx *utx)
1135 if ((fd = open(WTMPX_FILE, O_WRONLY|O_APPEND, 0)) < 0) {
1136 log("wtmpx_write: problem opening %s: %s",
1137 WTMPX_FILE, strerror(errno));
1141 if (fstat(fd, &buf) == 0)
1142 if (atomicio(write, fd, utx, sizeof(*utx)) != sizeof(*utx)) {
1143 ftruncate(fd, buf.st_size);
1144 log("wtmpx_write: problem writing %s: %s",
1145 WTMPX_FILE, strerror(errno));
1155 wtmpx_perform_login(struct logininfo *li)
1159 construct_utmpx(li, &utx);
1160 return wtmpx_write(li, &utx);
1165 wtmpx_perform_logout(struct logininfo *li)
1169 construct_utmpx(li, &utx);
1170 return wtmpx_write(li, &utx);
1175 wtmpx_write_entry(struct logininfo *li)
1179 return wtmpx_perform_login(li);
1181 return wtmpx_perform_logout(li);
1183 log("wtmpx_write_entry: invalid type field");
1188 /* Please see the notes above wtmp_islogin() for information about the
1189 next two functions */
1191 /* Return true if this wtmpx entry indicates a login */
1193 wtmpx_islogin(struct logininfo *li, struct utmpx *utx)
1195 if ( strncmp(li->username, utx->ut_name,
1196 MIN_SIZEOF(li->username, utx->ut_name)) == 0 ) {
1197 # ifdef HAVE_TYPE_IN_UTMPX
1198 if (utx->ut_type == USER_PROCESS)
1209 wtmpx_get_entry(struct logininfo *li)
1215 /* Clear the time entries */
1216 li->tv_sec = li->tv_usec = 0;
1218 if ((fd = open(WTMPX_FILE, O_RDONLY)) < 0) {
1219 log("wtmpx_get_entry: problem opening %s: %s",
1220 WTMPX_FILE, strerror(errno));
1223 if (fstat(fd, &st) != 0) {
1224 log("wtmpx_get_entry: couldn't stat %s: %s",
1225 WTMP_FILE, strerror(errno));
1230 /* Seek to the start of the last struct utmpx */
1231 if (lseek(fd, (off_t)(0-sizeof(struct utmpx)), SEEK_END) == -1 ) {
1232 /* probably a newly rotated wtmpx file */
1238 if (atomicio(read, fd, &utx, sizeof(utx)) != sizeof(utx)) {
1239 log("wtmpx_get_entry: read of %s failed: %s",
1240 WTMPX_FILE, strerror(errno));
1244 /* Logouts are recorded as a blank username on a particular line.
1245 * So, we just need to find the username in struct utmpx */
1246 if ( wtmpx_islogin(li, &utx) ) {
1247 # ifdef HAVE_TV_IN_UTMPX
1248 li->tv_sec = utx.ut_tv.tv_sec;
1250 # ifdef HAVE_TIME_IN_UTMPX
1251 li->tv_sec = utx.ut_time;
1254 line_fullname(li->line, utx.ut_line, sizeof(li->line));
1255 # ifdef HAVE_HOST_IN_UTMPX
1256 strlcpy(li->hostname, utx.ut_host,
1257 MIN_SIZEOF(li->hostname, utx.ut_host));
1261 if (lseek(fd, (off_t)(0-2*sizeof(struct utmpx)), SEEK_CUR) == -1) {
1270 #endif /* USE_WTMPX */
1273 ** Low-level libutil login() functions
1278 syslogin_perform_login(struct logininfo *li)
1282 if (! (ut = (struct utmp *)malloc(sizeof(*ut)))) {
1283 log("syslogin_perform_login: couldn't malloc()");
1286 construct_utmp(li, ut);
1293 syslogin_perform_logout(struct logininfo *li)
1298 (void)line_stripname(line, li->line, sizeof(line));
1300 if (!logout(line)) {
1301 log("syslogin_perform_logout: logout() returned an error");
1302 # ifdef HAVE_LOGWTMP
1304 logwtmp(line, "", "");
1307 /* FIXME: (ATL - if the need arises) What to do if we have
1308 * login, but no logout? what if logout but no logwtmp? All
1309 * routines are in libutil so they should all be there,
1316 syslogin_write_entry(struct logininfo *li)
1320 return syslogin_perform_login(li);
1322 return syslogin_perform_logout(li);
1324 log("syslogin_write_entry: Invalid type field");
1328 #endif /* USE_LOGIN */
1330 /* end of file log-syslogin.c */
1333 ** Low-level lastlog functions
1342 lastlog_construct(struct logininfo *li, struct lastlog *last)
1344 /* clear the structure */
1345 memset(last, '\0', sizeof(*last));
1347 (void)line_stripname(last->ll_line, li->line, sizeof(last->ll_line));
1348 strlcpy(last->ll_host, li->hostname,
1349 MIN_SIZEOF(last->ll_host, li->hostname));
1350 last->ll_time = li->tv_sec;
1354 lastlog_filetype(char *filename)
1358 if (stat(LASTLOG_FILE, &st) != 0) {
1359 log("lastlog_perform_login: Couldn't stat %s: %s", LASTLOG_FILE,
1363 if (S_ISDIR(st.st_mode))
1365 else if (S_ISREG(st.st_mode))
1372 /* open the file (using filemode) and seek to the login entry */
1374 lastlog_openseek(struct logininfo *li, int *fd, int filemode)
1378 char lastlog_file[1024];
1380 type = lastlog_filetype(LASTLOG_FILE);
1383 strlcpy(lastlog_file, LASTLOG_FILE, sizeof(lastlog_file));
1386 snprintf(lastlog_file, sizeof(lastlog_file), "%s/%s",
1387 LASTLOG_FILE, li->username);
1390 log("lastlog_openseek: %.100s is not a file or directory!",
1395 *fd = open(lastlog_file, filemode);
1397 debug("lastlog_openseek: Couldn't open %s: %s",
1398 lastlog_file, strerror(errno));
1402 if (type == LL_FILE) {
1403 /* find this uid's offset in the lastlog file */
1404 offset = (off_t) ( (long)li->uid * sizeof(struct lastlog));
1406 if ( lseek(*fd, offset, SEEK_SET) != offset ) {
1407 log("lastlog_openseek: %s->lseek(): %s",
1408 lastlog_file, strerror(errno));
1417 lastlog_perform_login(struct logininfo *li)
1419 struct lastlog last;
1422 /* create our struct lastlog */
1423 lastlog_construct(li, &last);
1425 if (!lastlog_openseek(li, &fd, O_RDWR|O_CREAT))
1428 /* write the entry */
1429 if (atomicio(write, fd, &last, sizeof(last)) != sizeof(last)) {
1431 log("lastlog_write_filemode: Error writing to %s: %s",
1432 LASTLOG_FILE, strerror(errno));
1441 lastlog_write_entry(struct logininfo *li)
1445 return lastlog_perform_login(li);
1447 log("lastlog_write_entry: Invalid type field");
1453 lastlog_populate_entry(struct logininfo *li, struct lastlog *last)
1455 line_fullname(li->line, last->ll_line, sizeof(li->line));
1456 strlcpy(li->hostname, last->ll_host,
1457 MIN_SIZEOF(li->hostname, last->ll_host));
1458 li->tv_sec = last->ll_time;
1462 lastlog_get_entry(struct logininfo *li)
1464 struct lastlog last;
1467 if (lastlog_openseek(li, &fd, O_RDONLY)) {
1468 if (atomicio(read, fd, &last, sizeof(last)) != sizeof(last)) {
1469 log("lastlog_get_entry: Error reading from %s: %s",
1470 LASTLOG_FILE, strerror(errno));
1473 lastlog_populate_entry(li, &last);
1480 #endif /* USE_LASTLOG */