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"
164 #include "atomicio.h"
172 #ifdef HAVE_LIBUTIL_H
173 # include <libutil.h>
177 ** prototypes for helper functions in this file
181 void set_utmp_time(struct logininfo *li, struct utmp *ut);
182 void construct_utmp(struct logininfo *li, struct utmp *ut);
186 void set_utmpx_time(struct logininfo *li, struct utmpx *ut);
187 void construct_utmpx(struct logininfo *li, struct utmpx *ut);
190 int utmp_write_entry(struct logininfo *li);
191 int utmpx_write_entry(struct logininfo *li);
192 int wtmp_write_entry(struct logininfo *li);
193 int wtmpx_write_entry(struct logininfo *li);
194 int lastlog_write_entry(struct logininfo *li);
195 int syslogin_write_entry(struct logininfo *li);
197 int getlast_entry(struct logininfo *li);
198 int lastlog_get_entry(struct logininfo *li);
199 int wtmp_get_entry(struct logininfo *li);
200 int wtmpx_get_entry(struct logininfo *li);
202 /* pick the shortest string */
203 #define MIN_SIZEOF(s1,s2) ( sizeof(s1) < sizeof(s2) ? sizeof(s1) : sizeof(s2) )
206 ** platform-independent login functions
209 /* login_login(struct logininfo *) -Record a login
211 * Call with a pointer to a struct logininfo initialised with
212 * login_init_entry() or login_alloc_entry()
216 * 0 on failure (will use OpenSSH's logging facilities for diagnostics)
219 login_login (struct logininfo *li)
221 li->type = LTYPE_LOGIN;
222 return login_write(li);
226 /* login_logout(struct logininfo *) - Record a logout
228 * Call as with login_login()
232 * 0 on failure (will use OpenSSH's logging facilities for diagnostics)
235 login_logout(struct logininfo *li)
237 li->type = LTYPE_LOGOUT;
238 return login_write(li);
241 /* login_get_lastlog_time(int) - Retrieve the last login time
243 * Retrieve the last login time for the given uid. Will try to use the
244 * system lastlog facilities if they are available, but will fall back
245 * to looking in wtmp/wtmpx if necessary
248 * 0 on failure, or if user has never logged in
249 * Time in seconds from the epoch if successful
251 * Useful preprocessor symbols:
252 * DISABLE_LASTLOG: If set, *never* even try to retrieve lastlog
254 * USE_LASTLOG: If set, indicates the presence of system lastlog
255 * facilities. If this and DISABLE_LASTLOG are not set,
256 * try to retrieve lastlog information from wtmp/wtmpx.
259 login_get_lastlog_time(const int uid)
263 if (login_get_lastlog(&li, uid))
269 /* login_get_lastlog(struct logininfo *, int) - Retrieve a lastlog entry
271 * Retrieve a logininfo structure populated (only partially) with
272 * information from the system lastlog data, or from wtmp/wtmpx if no
273 * system lastlog information exists.
275 * Note this routine must be given a pre-allocated logininfo.
278 * >0: A pointer to your struct logininfo if successful
279 * 0 on failure (will use OpenSSH's logging facilities for diagnostics)
283 login_get_lastlog(struct logininfo *li, const int uid)
287 memset(li, '\0', sizeof(*li));
291 * If we don't have a 'real' lastlog, we need the username to
292 * reliably search wtmp(x) for the last login (see
297 fatal("login_get_lastlog: Cannot find account for uid %i", uid);
299 /* No MIN_SIZEOF here - we absolutely *must not* truncate the
301 strlcpy(li->username, pw->pw_name, sizeof(li->username));
303 if (getlast_entry(li))
310 /* login_alloc_entry(int, char*, char*, char*) - Allocate and initialise
311 * a logininfo structure
313 * This function creates a new struct logininfo, a data structure
314 * meant to carry the information required to portably record login info.
316 * Returns a pointer to a newly created struct logininfo. If memory
317 * allocation fails, the program halts.
320 logininfo *login_alloc_entry(int pid, const char *username,
321 const char *hostname, const char *line)
323 struct logininfo *newli;
325 newli = (struct logininfo *) xmalloc (sizeof(*newli));
326 (void)login_init_entry(newli, pid, username, hostname, line);
331 /* login_free_entry(struct logininfo *) - free struct memory */
333 login_free_entry(struct logininfo *li)
339 /* login_init_entry(struct logininfo *, int, char*, char*, char*)
340 * - initialise a struct logininfo
342 * Populates a new struct logininfo, a data structure meant to carry
343 * the information required to portably record login info.
348 login_init_entry(struct logininfo *li, int pid, const char *username,
349 const char *hostname, const char *line)
353 memset(li, 0, sizeof(*li));
357 /* set the line information */
359 line_fullname(li->line, line, sizeof(li->line));
362 strlcpy(li->username, username, sizeof(li->username));
363 pw = getpwnam(li->username);
365 fatal("login_init_entry: Cannot find user \"%s\"", li->username);
366 li->uid = pw->pw_uid;
370 strlcpy(li->hostname, hostname, sizeof(li->hostname));
375 /* login_set_current_time(struct logininfo *) - set the current time
377 * Set the current time in a logininfo structure. This function is
378 * meant to eliminate the need to deal with system dependencies for
382 login_set_current_time(struct logininfo *li)
386 gettimeofday(&tv, NULL);
388 li->tv_sec = tv.tv_sec;
389 li->tv_usec = tv.tv_usec;
392 /* copy a sockaddr_* into our logininfo */
394 login_set_addr(struct logininfo *li, const struct sockaddr *sa,
395 const unsigned int sa_size)
397 unsigned int bufsize = sa_size;
399 /* make sure we don't overrun our union */
400 if (sizeof(li->hostaddr) < sa_size)
401 bufsize = sizeof(li->hostaddr);
403 memcpy((void *)&(li->hostaddr.sa), (const void *)sa, bufsize);
408 ** login_write: Call low-level recording functions based on autoconf
412 login_write (struct logininfo *li)
415 if ((int)geteuid() != 0) {
416 log("Attempt to write login records by non-root user (aborting)");
421 /* set the timestamp */
422 login_set_current_time(li);
424 syslogin_write_entry(li);
427 if (li->type == LTYPE_LOGIN) {
428 lastlog_write_entry(li);
432 utmp_write_entry(li);
435 wtmp_write_entry(li);
438 utmpx_write_entry(li);
441 wtmpx_write_entry(li);
447 ** getlast_entry: Call low-level functions to retrieve the last login
451 /* take the uid in li and return the last login time */
453 getlast_entry(struct logininfo *li)
456 return(lastlog_get_entry(li));
457 #else /* !USE_LASTLOG */
459 #ifdef DISABLE_LASTLOG
460 /* On some systems we shouldn't even try to obtain last login
463 # else /* DISABLE_LASTLOG */
464 /* Try to retrieve the last login time from wtmp */
465 # if defined(USE_WTMP) && (defined(HAVE_TIME_IN_UTMP) || defined(HAVE_TV_IN_UTMP))
466 /* retrieve last login time from utmp */
467 return (wtmp_get_entry(li));
468 # else /* defined(USE_WTMP) && (defined(HAVE_TIME_IN_UTMP) || defined(HAVE_TV_IN_UTMP)) */
469 /* If wtmp isn't available, try wtmpx */
470 # if defined(USE_WTMPX) && (defined(HAVE_TIME_IN_UTMPX) || defined(HAVE_TV_IN_UTMPX))
471 /* retrieve last login time from utmpx */
472 return (wtmpx_get_entry(li));
474 /* Give up: No means of retrieving last login time */
476 # endif /* USE_WTMPX && (HAVE_TIME_IN_UTMPX || HAVE_TV_IN_UTMPX) */
477 # endif /* USE_WTMP && (HAVE_TIME_IN_UTMP || HAVE_TV_IN_UTMP) */
478 # endif /* DISABLE_LASTLOG */
479 #endif /* USE_LASTLOG */
485 * 'line' string utility functions
487 * These functions process the 'line' string into one of three forms:
489 * 1. The full filename (including '/dev')
490 * 2. The stripped name (excluding '/dev')
491 * 3. The abbreviated name (e.g. /dev/ttyp00 -> yp00
492 * /dev/pts/1 -> ts/1 )
494 * Form 3 is used on some systems to identify a .tmp.? entry when
495 * attempting to remove it. Typically both addition and removal is
496 * performed by one application - say, sshd - so as long as the choice
497 * uniquely identifies a terminal it's ok.
501 /* line_fullname(): add the leading '/dev/' if it doesn't exist make
502 * sure dst has enough space, if not just copy src (ugh) */
504 line_fullname(char *dst, const char *src, int dstsize)
506 memset(dst, '\0', dstsize);
507 if ((strncmp(src, "/dev/", 5) == 0) || (dstsize < (strlen(src) + 5))) {
508 strlcpy(dst, src, dstsize);
510 strlcpy(dst, "/dev/", dstsize);
511 strlcat(dst, src, dstsize);
516 /* line_stripname(): strip the leading '/dev' if it exists, return dst */
518 line_stripname(char *dst, const char *src, int dstsize)
520 memset(dst, '\0', dstsize);
521 if (strncmp(src, "/dev/", 5) == 0)
522 strlcpy(dst, src + 5, dstsize);
524 strlcpy(dst, src, dstsize);
528 /* line_abbrevname(): Return the abbreviated (usually four-character)
529 * form of the line (Just use the last <dstsize> characters of the
532 * NOTE: use strncpy because we do NOT necessarily want zero
535 line_abbrevname(char *dst, const char *src, int dstsize)
539 memset(dst, '\0', dstsize);
541 /* Always skip prefix if present */
543 if (strncmp(src, "/dev/tty", 8) == 0)
546 if (strncmp(src, "/dev/", 5) == 0)
553 if (((int)len - dstsize) > 0)
554 src += ((int)len - dstsize);
556 /* note: _don't_ change this to strlcpy */
557 strncpy(dst, src, (size_t)dstsize);
564 ** utmp utility functions
566 ** These functions manipulate struct utmp, taking system differences
570 #if defined(USE_UTMP) || defined (USE_WTMP) || defined (USE_LOGIN)
572 /* build the utmp structure */
574 set_utmp_time(struct logininfo *li, struct utmp *ut)
576 # ifdef HAVE_TV_IN_UTMP
577 ut->ut_tv.tv_sec = li->tv_sec;
578 ut->ut_tv.tv_usec = li->tv_usec;
580 # ifdef HAVE_TIME_IN_UTMP
581 ut->ut_time = li->tv_sec;
587 construct_utmp(struct logininfo *li,
590 memset(ut, '\0', sizeof(*ut));
592 /* First fill out fields used for both logins and logouts */
594 # ifdef HAVE_ID_IN_UTMP
595 line_abbrevname(ut->ut_id, li->line, sizeof(ut->ut_id));
598 # ifdef HAVE_TYPE_IN_UTMP
599 /* This is done here to keep utmp constants out of struct logininfo */
602 ut->ut_type = USER_PROCESS;
605 ut->ut_type = DEAD_PROCESS;
609 set_utmp_time(li, ut);
611 line_stripname(ut->ut_line, li->line, sizeof(ut->ut_line));
613 # ifdef HAVE_PID_IN_UTMP
614 ut->ut_pid = li->pid;
617 /* If we're logging out, leave all other fields blank */
618 if (li->type == LTYPE_LOGOUT)
622 * These fields are only used when logging in, and are blank
626 /* Use strncpy because we don't necessarily want null termination */
627 strncpy(ut->ut_name, li->username, MIN_SIZEOF(ut->ut_name, li->username));
628 # ifdef HAVE_HOST_IN_UTMP
629 strncpy(ut->ut_host, li->hostname, MIN_SIZEOF(ut->ut_host, li->hostname));
631 # ifdef HAVE_ADDR_IN_UTMP
632 /* this is just a 32-bit IP address */
633 if (li->hostaddr.sa.sa_family == AF_INET)
634 ut->ut_addr = li->hostaddr.sa_in.sin_addr.s_addr;
637 #endif /* USE_UTMP || USE_WTMP || USE_LOGIN */
640 ** utmpx utility functions
642 ** These functions manipulate struct utmpx, accounting for system
646 #if defined(USE_UTMPX) || defined (USE_WTMPX)
647 /* build the utmpx structure */
649 set_utmpx_time(struct logininfo *li, struct utmpx *utx)
651 # ifdef HAVE_TV_IN_UTMPX
652 utx->ut_tv.tv_sec = li->tv_sec;
653 utx->ut_tv.tv_usec = li->tv_usec;
654 # else /* HAVE_TV_IN_UTMPX */
655 # ifdef HAVE_TIME_IN_UTMPX
656 utx->ut_time = li->tv_sec;
657 # endif /* HAVE_TIME_IN_UTMPX */
658 # endif /* HAVE_TV_IN_UTMPX */
662 construct_utmpx(struct logininfo *li, struct utmpx *utx)
664 memset(utx, '\0', sizeof(*utx));
665 # ifdef HAVE_ID_IN_UTMPX
666 line_abbrevname(utx->ut_id, li->line, sizeof(utx->ut_id));
669 /* this is done here to keep utmp constants out of loginrec.h */
672 utx->ut_type = USER_PROCESS;
675 utx->ut_type = DEAD_PROCESS;
678 line_stripname(utx->ut_line, li->line, sizeof(utx->ut_line));
679 set_utmpx_time(li, utx);
680 utx->ut_pid = li->pid;
682 if (li->type == LTYPE_LOGOUT)
686 * These fields are only used when logging in, and are blank
690 /* strncpy(): Don't necessarily want null termination */
691 strncpy(utx->ut_name, li->username, MIN_SIZEOF(utx->ut_name, li->username));
692 # ifdef HAVE_HOST_IN_UTMPX
693 strncpy(utx->ut_host, li->hostname, MIN_SIZEOF(utx->ut_host, li->hostname));
695 # ifdef HAVE_ADDR_IN_UTMPX
696 /* this is just a 32-bit IP address */
697 if (li->hostaddr.sa.sa_family == AF_INET)
698 utx->ut_addr = li->hostaddr.sa_in.sin_addr.s_addr;
700 # ifdef HAVE_SYSLEN_IN_UTMPX
701 /* ut_syslen is the length of the utx_host string */
702 utx->ut_syslen = MIN(strlen(li->hostname), sizeof(utx->ut_host));
705 #endif /* USE_UTMPX || USE_WTMPX */
708 ** Low-level utmp functions
711 /* FIXME: (ATL) utmp_write_direct needs testing */
714 /* if we can, use pututline() etc. */
715 # if !defined(DISABLE_PUTUTLINE) && defined(HAVE_SETUTENT) && \
716 defined(HAVE_PUTUTLINE)
717 # define UTMP_USE_LIBRARY
721 /* write a utmp entry with the system's help (pututline() and pals) */
722 # ifdef UTMP_USE_LIBRARY
724 utmp_write_library(struct logininfo *li, struct utmp *ut)
729 # ifdef HAVE_ENDUTENT
734 # else /* UTMP_USE_LIBRARY */
736 /* write a utmp entry direct to the file */
737 /* This is a slightly modification of code in OpenBSD's login.c */
739 utmp_write_direct(struct logininfo *li, struct utmp *ut)
745 /* FIXME: (ATL) ttyslot() needs local implementation */
747 #if defined(HAVE_GETTTYENT)
748 register struct ttyent *ty;
753 while ((struct ttyent *)0 != (ty = getttyent())) {
755 if (!strncmp(ty->ty_name, ut->ut_line, sizeof(ut->ut_line)))
760 if((struct ttyent *)0 == ty) {
761 log("utmp_write_entry: tty not found");
766 tty = ttyslot(); /* seems only to work for /dev/ttyp? style names */
768 #endif /* HAVE_GETTTYENT */
770 if (tty > 0 && (fd = open(UTMP_FILE, O_RDWR|O_CREAT, 0644)) >= 0) {
771 (void)lseek(fd, (off_t)(tty * sizeof(struct utmp)), SEEK_SET);
773 * Prevent luser from zero'ing out ut_host.
774 * If the new ut_line is empty but the old one is not
775 * and ut_line and ut_name match, preserve the old ut_line.
777 if (atomicio(read, fd, &old_ut, sizeof(old_ut)) == sizeof(old_ut) &&
778 (ut->ut_host[0] == '\0') && (old_ut.ut_host[0] != '\0') &&
779 (strncmp(old_ut.ut_line, ut->ut_line, sizeof(ut->ut_line)) == 0) &&
780 (strncmp(old_ut.ut_name, ut->ut_name, sizeof(ut->ut_name)) == 0)) {
781 (void)memcpy(ut->ut_host, old_ut.ut_host, sizeof(ut->ut_host));
784 (void)lseek(fd, (off_t)(tty * sizeof(struct utmp)), SEEK_SET);
785 if (atomicio(write, fd, ut, sizeof(*ut)) != sizeof(*ut))
786 log("utmp_write_direct: error writing %s: %s",
787 UTMP_FILE, strerror(errno));
795 # endif /* UTMP_USE_LIBRARY */
798 utmp_perform_login(struct logininfo *li)
802 construct_utmp(li, &ut);
803 # ifdef UTMP_USE_LIBRARY
804 if (!utmp_write_library(li, &ut)) {
805 log("utmp_perform_login: utmp_write_library() failed");
809 if (!utmp_write_direct(li, &ut)) {
810 log("utmp_perform_login: utmp_write_direct() failed");
819 utmp_perform_logout(struct logininfo *li)
823 construct_utmp(li, &ut);
824 # ifdef UTMP_USE_LIBRARY
825 if (!utmp_write_library(li, &ut)) {
826 log("utmp_perform_logout: utmp_write_library() failed");
830 if (!utmp_write_direct(li, &ut)) {
831 log("utmp_perform_logout: utmp_write_direct() failed");
840 utmp_write_entry(struct logininfo *li)
844 return utmp_perform_login(li);
847 return utmp_perform_logout(li);
850 log("utmp_write_entry: invalid type field");
854 #endif /* USE_UTMP */
858 ** Low-level utmpx functions
861 /* not much point if we don't want utmpx entries */
864 /* if we have the wherewithall, use pututxline etc. */
865 # if !defined(DISABLE_PUTUTXLINE) && defined(HAVE_SETUTXENT) && \
866 defined(HAVE_PUTUTXLINE)
867 # define UTMPX_USE_LIBRARY
871 /* write a utmpx entry with the system's help (pututxline() and pals) */
872 # ifdef UTMPX_USE_LIBRARY
874 utmpx_write_library(struct logininfo *li, struct utmpx *utx)
879 # ifdef HAVE_ENDUTXENT
885 # else /* UTMPX_USE_LIBRARY */
887 /* write a utmp entry direct to the file */
889 utmpx_write_direct(struct logininfo *li, struct utmpx *utx)
891 log("utmpx_write_direct: not implemented!");
894 # endif /* UTMPX_USE_LIBRARY */
897 utmpx_perform_login(struct logininfo *li)
901 construct_utmpx(li, &utx);
902 # ifdef UTMPX_USE_LIBRARY
903 if (!utmpx_write_library(li, &utx)) {
904 log("utmpx_perform_login: utmp_write_library() failed");
908 if (!utmpx_write_direct(li, &ut)) {
909 log("utmpx_perform_login: utmp_write_direct() failed");
918 utmpx_perform_logout(struct logininfo *li)
922 memset(&utx, '\0', sizeof(utx));
923 set_utmpx_time(li, &utx);
924 line_stripname(utx.ut_line, li->line, sizeof(utx.ut_line));
925 # ifdef HAVE_ID_IN_UTMPX
926 line_abbrevname(utx.ut_id, li->line, sizeof(utx.ut_id));
928 # ifdef HAVE_TYPE_IN_UTMPX
929 utx.ut_type = DEAD_PROCESS;
932 # ifdef UTMPX_USE_LIBRARY
933 utmpx_write_library(li, &utx);
935 utmpx_write_direct(li, &utx);
941 utmpx_write_entry(struct logininfo *li)
945 return utmpx_perform_login(li);
947 return utmpx_perform_logout(li);
949 log("utmpx_write_entry: invalid type field");
953 #endif /* USE_UTMPX */
957 ** Low-level wtmp functions
962 /* write a wtmp entry direct to the end of the file */
963 /* This is a slight modification of code in OpenBSD's logwtmp.c */
965 wtmp_write(struct logininfo *li, struct utmp *ut)
970 if ((fd = open(WTMP_FILE, O_WRONLY|O_APPEND, 0)) < 0) {
971 log("wtmp_write: problem writing %s: %s",
972 WTMP_FILE, strerror(errno));
975 if (fstat(fd, &buf) == 0)
976 if (atomicio(write, fd, ut, sizeof(*ut)) != sizeof(*ut)) {
977 ftruncate(fd, buf.st_size);
978 log("wtmp_write: problem writing %s: %s",
979 WTMP_FILE, strerror(errno));
987 wtmp_perform_login(struct logininfo *li)
991 construct_utmp(li, &ut);
992 return wtmp_write(li, &ut);
997 wtmp_perform_logout(struct logininfo *li)
1001 construct_utmp(li, &ut);
1002 return wtmp_write(li, &ut);
1007 wtmp_write_entry(struct logininfo *li)
1011 return wtmp_perform_login(li);
1013 return wtmp_perform_logout(li);
1015 log("wtmp_write_entry: invalid type field");
1021 /* Notes on fetching login data from wtmp/wtmpx
1023 * Logouts are usually recorded with (amongst other things) a blank
1024 * username on a given tty line. However, some systems (HP-UX is one)
1025 * leave all fields set, but change the ut_type field to DEAD_PROCESS.
1027 * Since we're only looking for logins here, we know that the username
1028 * must be set correctly. On systems that leave it in, we check for
1029 * ut_type==USER_PROCESS (indicating a login.)
1031 * Portability: Some systems may set something other than USER_PROCESS
1032 * to indicate a login process. I don't know of any as I write. Also,
1033 * it's possible that some systems may both leave the username in
1034 * place and not have ut_type.
1037 /* return true if this wtmp entry indicates a login */
1039 wtmp_islogin(struct logininfo *li, struct utmp *ut)
1041 if (strncmp(li->username, ut->ut_name,
1042 MIN_SIZEOF(li->username, ut->ut_name)) == 0) {
1043 # ifdef HAVE_TYPE_IN_UTMP
1044 if (ut->ut_type & USER_PROCESS)
1054 wtmp_get_entry(struct logininfo *li)
1060 /* Clear the time entries in our logininfo */
1061 li->tv_sec = li->tv_usec = 0;
1063 if ((fd = open(WTMP_FILE, O_RDONLY)) < 0) {
1064 log("wtmp_get_entry: problem opening %s: %s",
1065 WTMP_FILE, strerror(errno));
1068 if (fstat(fd, &st) != 0) {
1069 log("wtmp_get_entry: couldn't stat %s: %s",
1070 WTMP_FILE, strerror(errno));
1075 /* Seek to the start of the last struct utmp */
1076 if (lseek(fd, (off_t)(0 - sizeof(struct utmp)), SEEK_END) == -1) {
1077 /* Looks like we've got a fresh wtmp file */
1083 if (atomicio(read, fd, &ut, sizeof(ut)) != sizeof(ut)) {
1084 log("wtmp_get_entry: read of %s failed: %s",
1085 WTMP_FILE, strerror(errno));
1089 if ( wtmp_islogin(li, &ut) ) {
1091 /* We've already checked for a time in struct
1092 * utmp, in login_getlast(). */
1093 # ifdef HAVE_TIME_IN_UTMP
1094 li->tv_sec = ut.ut_time;
1096 # if HAVE_TV_IN_UTMP
1097 li->tv_sec = ut.ut_tv.tv_sec;
1100 line_fullname(li->line, ut.ut_line,
1101 MIN_SIZEOF(li->line, ut.ut_line));
1102 # ifdef HAVE_HOST_IN_UTMP
1103 strlcpy(li->hostname, ut.ut_host,
1104 MIN_SIZEOF(li->hostname, ut.ut_host));
1108 /* Seek back 2 x struct utmp */
1109 if (lseek(fd, (off_t)(0-2*sizeof(struct utmp)), SEEK_CUR) == -1) {
1110 /* We've found the start of the file, so quit */
1116 /* We found an entry. Tidy up and return */
1120 # endif /* USE_WTMP */
1124 ** Low-level wtmpx functions
1128 /* write a wtmpx entry direct to the end of the file */
1129 /* This is a slight modification of code in OpenBSD's logwtmp.c */
1131 wtmpx_write(struct logininfo *li, struct utmpx *utx)
1136 if ((fd = open(WTMPX_FILE, O_WRONLY|O_APPEND, 0)) < 0) {
1137 log("wtmpx_write: problem opening %s: %s",
1138 WTMPX_FILE, strerror(errno));
1142 if (fstat(fd, &buf) == 0)
1143 if (atomicio(write, fd, utx, sizeof(*utx)) != sizeof(*utx)) {
1144 ftruncate(fd, buf.st_size);
1145 log("wtmpx_write: problem writing %s: %s",
1146 WTMPX_FILE, strerror(errno));
1156 wtmpx_perform_login(struct logininfo *li)
1160 construct_utmpx(li, &utx);
1161 return wtmpx_write(li, &utx);
1166 wtmpx_perform_logout(struct logininfo *li)
1170 construct_utmpx(li, &utx);
1171 return wtmpx_write(li, &utx);
1176 wtmpx_write_entry(struct logininfo *li)
1180 return wtmpx_perform_login(li);
1182 return wtmpx_perform_logout(li);
1184 log("wtmpx_write_entry: invalid type field");
1189 /* Please see the notes above wtmp_islogin() for information about the
1190 next two functions */
1192 /* Return true if this wtmpx entry indicates a login */
1194 wtmpx_islogin(struct logininfo *li, struct utmpx *utx)
1196 if ( strncmp(li->username, utx->ut_name,
1197 MIN_SIZEOF(li->username, utx->ut_name)) == 0 ) {
1198 # ifdef HAVE_TYPE_IN_UTMPX
1199 if (utx->ut_type == USER_PROCESS)
1210 wtmpx_get_entry(struct logininfo *li)
1216 /* Clear the time entries */
1217 li->tv_sec = li->tv_usec = 0;
1219 if ((fd = open(WTMPX_FILE, O_RDONLY)) < 0) {
1220 log("wtmpx_get_entry: problem opening %s: %s",
1221 WTMPX_FILE, strerror(errno));
1224 if (fstat(fd, &st) != 0) {
1225 log("wtmpx_get_entry: couldn't stat %s: %s",
1226 WTMP_FILE, strerror(errno));
1231 /* Seek to the start of the last struct utmpx */
1232 if (lseek(fd, (off_t)(0-sizeof(struct utmpx)), SEEK_END) == -1 ) {
1233 /* probably a newly rotated wtmpx file */
1239 if (atomicio(read, fd, &utx, sizeof(utx)) != sizeof(utx)) {
1240 log("wtmpx_get_entry: read of %s failed: %s",
1241 WTMPX_FILE, strerror(errno));
1245 /* Logouts are recorded as a blank username on a particular line.
1246 * So, we just need to find the username in struct utmpx */
1247 if ( wtmpx_islogin(li, &utx) ) {
1248 # ifdef HAVE_TV_IN_UTMPX
1249 li->tv_sec = utx.ut_tv.tv_sec;
1251 # ifdef HAVE_TIME_IN_UTMPX
1252 li->tv_sec = utx.ut_time;
1255 line_fullname(li->line, utx.ut_line, sizeof(li->line));
1256 # ifdef HAVE_HOST_IN_UTMPX
1257 strlcpy(li->hostname, utx.ut_host,
1258 MIN_SIZEOF(li->hostname, utx.ut_host));
1262 if (lseek(fd, (off_t)(0-2*sizeof(struct utmpx)), SEEK_CUR) == -1) {
1271 #endif /* USE_WTMPX */
1274 ** Low-level libutil login() functions
1279 syslogin_perform_login(struct logininfo *li)
1283 if (! (ut = (struct utmp *)malloc(sizeof(*ut)))) {
1284 log("syslogin_perform_login: couldn't malloc()");
1287 construct_utmp(li, ut);
1294 syslogin_perform_logout(struct logininfo *li)
1299 (void)line_stripname(line, li->line, sizeof(line));
1301 if (!logout(line)) {
1302 log("syslogin_perform_logout: logout() returned an error");
1303 # ifdef HAVE_LOGWTMP
1305 logwtmp(line, "", "");
1308 /* FIXME: (ATL - if the need arises) What to do if we have
1309 * login, but no logout? what if logout but no logwtmp? All
1310 * routines are in libutil so they should all be there,
1317 syslogin_write_entry(struct logininfo *li)
1321 return syslogin_perform_login(li);
1323 return syslogin_perform_logout(li);
1325 log("syslogin_write_entry: Invalid type field");
1329 #endif /* USE_LOGIN */
1331 /* end of file log-syslogin.c */
1334 ** Low-level lastlog functions
1343 lastlog_construct(struct logininfo *li, struct lastlog *last)
1345 /* clear the structure */
1346 memset(last, '\0', sizeof(*last));
1348 (void)line_stripname(last->ll_line, li->line, sizeof(last->ll_line));
1349 strlcpy(last->ll_host, li->hostname,
1350 MIN_SIZEOF(last->ll_host, li->hostname));
1351 last->ll_time = li->tv_sec;
1355 lastlog_filetype(char *filename)
1359 if (stat(LASTLOG_FILE, &st) != 0) {
1360 log("lastlog_perform_login: Couldn't stat %s: %s", LASTLOG_FILE,
1364 if (S_ISDIR(st.st_mode))
1366 else if (S_ISREG(st.st_mode))
1373 /* open the file (using filemode) and seek to the login entry */
1375 lastlog_openseek(struct logininfo *li, int *fd, int filemode)
1379 char lastlog_file[1024];
1381 type = lastlog_filetype(LASTLOG_FILE);
1384 strlcpy(lastlog_file, LASTLOG_FILE, sizeof(lastlog_file));
1387 snprintf(lastlog_file, sizeof(lastlog_file), "%s/%s",
1388 LASTLOG_FILE, li->username);
1391 log("lastlog_openseek: %.100s is not a file or directory!",
1396 *fd = open(lastlog_file, filemode);
1398 debug("lastlog_openseek: Couldn't open %s: %s",
1399 lastlog_file, strerror(errno));
1403 if (type == LL_FILE) {
1404 /* find this uid's offset in the lastlog file */
1405 offset = (off_t) ( (long)li->uid * sizeof(struct lastlog));
1407 if ( lseek(*fd, offset, SEEK_SET) != offset ) {
1408 log("lastlog_openseek: %s->lseek(): %s",
1409 lastlog_file, strerror(errno));
1418 lastlog_perform_login(struct logininfo *li)
1420 struct lastlog last;
1423 /* create our struct lastlog */
1424 lastlog_construct(li, &last);
1426 if (!lastlog_openseek(li, &fd, O_RDWR|O_CREAT))
1429 /* write the entry */
1430 if (atomicio(write, fd, &last, sizeof(last)) != sizeof(last)) {
1432 log("lastlog_write_filemode: Error writing to %s: %s",
1433 LASTLOG_FILE, strerror(errno));
1442 lastlog_write_entry(struct logininfo *li)
1446 return lastlog_perform_login(li);
1448 log("lastlog_write_entry: Invalid type field");
1454 lastlog_populate_entry(struct logininfo *li, struct lastlog *last)
1456 line_fullname(li->line, last->ll_line, sizeof(li->line));
1457 strlcpy(li->hostname, last->ll_host,
1458 MIN_SIZEOF(li->hostname, last->ll_host));
1459 li->tv_sec = last->ll_time;
1463 lastlog_get_entry(struct logininfo *li)
1465 struct lastlog last;
1468 if (lastlog_openseek(li, &fd, O_RDONLY)) {
1469 if (atomicio(read, fd, &last, sizeof(last)) != sizeof(last)) {
1470 log("lastlog_get_entry: Error reading from %s: %s",
1471 LASTLOG_FILE, strerror(errno));
1474 lastlog_populate_entry(li, &last);
1481 #endif /* USE_LASTLOG */