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);
446 #ifdef LOGIN_NEEDS_UTMPX
448 login_utmp_only(struct logininfo *li)
450 li->type = LTYPE_LOGIN;
452 utmp_write_entry(li);
455 wtmp_write_entry(li);
458 utmpx_write_entry(li);
461 wtmpx_write_entry(li);
468 ** getlast_entry: Call low-level functions to retrieve the last login
472 /* take the uid in li and return the last login time */
474 getlast_entry(struct logininfo *li)
477 return(lastlog_get_entry(li));
478 #else /* !USE_LASTLOG */
480 #ifdef DISABLE_LASTLOG
481 /* On some systems we shouldn't even try to obtain last login
484 # else /* DISABLE_LASTLOG */
485 /* Try to retrieve the last login time from wtmp */
486 # if defined(USE_WTMP) && (defined(HAVE_TIME_IN_UTMP) || defined(HAVE_TV_IN_UTMP))
487 /* retrieve last login time from utmp */
488 return (wtmp_get_entry(li));
489 # else /* defined(USE_WTMP) && (defined(HAVE_TIME_IN_UTMP) || defined(HAVE_TV_IN_UTMP)) */
490 /* If wtmp isn't available, try wtmpx */
491 # if defined(USE_WTMPX) && (defined(HAVE_TIME_IN_UTMPX) || defined(HAVE_TV_IN_UTMPX))
492 /* retrieve last login time from utmpx */
493 return (wtmpx_get_entry(li));
495 /* Give up: No means of retrieving last login time */
497 # endif /* USE_WTMPX && (HAVE_TIME_IN_UTMPX || HAVE_TV_IN_UTMPX) */
498 # endif /* USE_WTMP && (HAVE_TIME_IN_UTMP || HAVE_TV_IN_UTMP) */
499 # endif /* DISABLE_LASTLOG */
500 #endif /* USE_LASTLOG */
506 * 'line' string utility functions
508 * These functions process the 'line' string into one of three forms:
510 * 1. The full filename (including '/dev')
511 * 2. The stripped name (excluding '/dev')
512 * 3. The abbreviated name (e.g. /dev/ttyp00 -> yp00
513 * /dev/pts/1 -> ts/1 )
515 * Form 3 is used on some systems to identify a .tmp.? entry when
516 * attempting to remove it. Typically both addition and removal is
517 * performed by one application - say, sshd - so as long as the choice
518 * uniquely identifies a terminal it's ok.
522 /* line_fullname(): add the leading '/dev/' if it doesn't exist make
523 * sure dst has enough space, if not just copy src (ugh) */
525 line_fullname(char *dst, const char *src, int dstsize)
527 memset(dst, '\0', dstsize);
528 if ((strncmp(src, "/dev/", 5) == 0) || (dstsize < (strlen(src) + 5))) {
529 strlcpy(dst, src, dstsize);
531 strlcpy(dst, "/dev/", dstsize);
532 strlcat(dst, src, dstsize);
537 /* line_stripname(): strip the leading '/dev' if it exists, return dst */
539 line_stripname(char *dst, const char *src, int dstsize)
541 memset(dst, '\0', dstsize);
542 if (strncmp(src, "/dev/", 5) == 0)
543 strlcpy(dst, src + 5, dstsize);
545 strlcpy(dst, src, dstsize);
549 /* line_abbrevname(): Return the abbreviated (usually four-character)
550 * form of the line (Just use the last <dstsize> characters of the
553 * NOTE: use strncpy because we do NOT necessarily want zero
556 line_abbrevname(char *dst, const char *src, int dstsize)
560 memset(dst, '\0', dstsize);
562 /* Always skip prefix if present */
563 if (strncmp(src, "/dev/", 5) == 0)
569 if (((int)len - dstsize) > 0)
570 src += ((int)len - dstsize);
572 /* note: _don't_ change this to strlcpy */
573 strncpy(dst, src, (size_t)dstsize);
580 ** utmp utility functions
582 ** These functions manipulate struct utmp, taking system differences
586 #if defined(USE_UTMP) || defined (USE_WTMP) || defined (USE_LOGIN)
588 /* build the utmp structure */
590 set_utmp_time(struct logininfo *li, struct utmp *ut)
592 # ifdef HAVE_TV_IN_UTMP
593 ut->ut_tv.tv_sec = li->tv_sec;
594 ut->ut_tv.tv_usec = li->tv_usec;
596 # ifdef HAVE_TIME_IN_UTMP
597 ut->ut_time = li->tv_sec;
603 construct_utmp(struct logininfo *li,
606 memset(ut, '\0', sizeof(*ut));
608 /* First fill out fields used for both logins and logouts */
610 # ifdef HAVE_ID_IN_UTMP
611 line_abbrevname(ut->ut_id, li->line, sizeof(ut->ut_id));
614 # ifdef HAVE_TYPE_IN_UTMP
615 /* This is done here to keep utmp constants out of struct logininfo */
618 ut->ut_type = USER_PROCESS;
621 ut->ut_type = DEAD_PROCESS;
625 set_utmp_time(li, ut);
627 line_stripname(ut->ut_line, li->line, sizeof(ut->ut_line));
629 # ifdef HAVE_PID_IN_UTMP
630 ut->ut_pid = li->pid;
633 /* If we're logging out, leave all other fields blank */
634 if (li->type == LTYPE_LOGOUT)
638 * These fields are only used when logging in, and are blank
642 /* Use strncpy because we don't necessarily want null termination */
643 strncpy(ut->ut_name, li->username, MIN_SIZEOF(ut->ut_name, li->username));
644 # ifdef HAVE_HOST_IN_UTMP
645 strncpy(ut->ut_host, li->hostname, MIN_SIZEOF(ut->ut_host, li->hostname));
647 # ifdef HAVE_ADDR_IN_UTMP
648 /* this is just a 32-bit IP address */
649 if (li->hostaddr.sa.sa_family == AF_INET)
650 ut->ut_addr = li->hostaddr.sa_in.sin_addr.s_addr;
653 #endif /* USE_UTMP || USE_WTMP || USE_LOGIN */
656 ** utmpx utility functions
658 ** These functions manipulate struct utmpx, accounting for system
662 #if defined(USE_UTMPX) || defined (USE_WTMPX)
663 /* build the utmpx structure */
665 set_utmpx_time(struct logininfo *li, struct utmpx *utx)
667 # ifdef HAVE_TV_IN_UTMPX
668 utx->ut_tv.tv_sec = li->tv_sec;
669 utx->ut_tv.tv_usec = li->tv_usec;
670 # else /* HAVE_TV_IN_UTMPX */
671 # ifdef HAVE_TIME_IN_UTMPX
672 utx->ut_time = li->tv_sec;
673 # endif /* HAVE_TIME_IN_UTMPX */
674 # endif /* HAVE_TV_IN_UTMPX */
678 construct_utmpx(struct logininfo *li, struct utmpx *utx)
680 memset(utx, '\0', sizeof(*utx));
681 # ifdef HAVE_ID_IN_UTMPX
682 line_abbrevname(utx->ut_id, li->line, sizeof(utx->ut_id));
685 /* this is done here to keep utmp constants out of loginrec.h */
688 utx->ut_type = USER_PROCESS;
691 utx->ut_type = DEAD_PROCESS;
694 line_stripname(utx->ut_line, li->line, sizeof(utx->ut_line));
695 set_utmpx_time(li, utx);
696 utx->ut_pid = li->pid;
698 if (li->type == LTYPE_LOGOUT)
702 * These fields are only used when logging in, and are blank
706 /* strncpy(): Don't necessarily want null termination */
707 strncpy(utx->ut_name, li->username, MIN_SIZEOF(utx->ut_name, li->username));
708 # ifdef HAVE_HOST_IN_UTMPX
709 strncpy(utx->ut_host, li->hostname, MIN_SIZEOF(utx->ut_host, li->hostname));
711 # ifdef HAVE_ADDR_IN_UTMPX
712 /* this is just a 32-bit IP address */
713 if (li->hostaddr.sa.sa_family == AF_INET)
714 utx->ut_addr = li->hostaddr.sa_in.sin_addr.s_addr;
716 # ifdef HAVE_SYSLEN_IN_UTMPX
717 /* ut_syslen is the length of the utx_host string */
718 utx->ut_syslen = MIN(strlen(li->hostname), sizeof(utx->ut_host));
721 #endif /* USE_UTMPX || USE_WTMPX */
724 ** Low-level utmp functions
727 /* FIXME: (ATL) utmp_write_direct needs testing */
730 /* if we can, use pututline() etc. */
731 # if !defined(DISABLE_PUTUTLINE) && defined(HAVE_SETUTENT) && \
732 defined(HAVE_PUTUTLINE)
733 # define UTMP_USE_LIBRARY
737 /* write a utmp entry with the system's help (pututline() and pals) */
738 # ifdef UTMP_USE_LIBRARY
740 utmp_write_library(struct logininfo *li, struct utmp *ut)
745 # ifdef HAVE_ENDUTENT
750 # else /* UTMP_USE_LIBRARY */
752 /* write a utmp entry direct to the file */
753 /* This is a slightly modification of code in OpenBSD's login.c */
755 utmp_write_direct(struct logininfo *li, struct utmp *ut)
761 /* FIXME: (ATL) ttyslot() needs local implementation */
763 #if defined(HAVE_GETTTYENT)
764 register struct ttyent *ty;
769 while ((struct ttyent *)0 != (ty = getttyent())) {
771 if (!strncmp(ty->ty_name, ut->ut_line, sizeof(ut->ut_line)))
776 if((struct ttyent *)0 == ty) {
777 log("utmp_write_entry: tty not found");
782 tty = ttyslot(); /* seems only to work for /dev/ttyp? style names */
784 #endif /* HAVE_GETTTYENT */
786 if (tty > 0 && (fd = open(UTMP_FILE, O_RDWR|O_CREAT, 0644)) >= 0) {
787 (void)lseek(fd, (off_t)(tty * sizeof(struct utmp)), SEEK_SET);
789 * Prevent luser from zero'ing out ut_host.
790 * If the new ut_line is empty but the old one is not
791 * and ut_line and ut_name match, preserve the old ut_line.
793 if (atomicio(read, fd, &old_ut, sizeof(old_ut)) == sizeof(old_ut) &&
794 (ut->ut_host[0] == '\0') && (old_ut.ut_host[0] != '\0') &&
795 (strncmp(old_ut.ut_line, ut->ut_line, sizeof(ut->ut_line)) == 0) &&
796 (strncmp(old_ut.ut_name, ut->ut_name, sizeof(ut->ut_name)) == 0)) {
797 (void)memcpy(ut->ut_host, old_ut.ut_host, sizeof(ut->ut_host));
800 (void)lseek(fd, (off_t)(tty * sizeof(struct utmp)), SEEK_SET);
801 if (atomicio(write, fd, ut, sizeof(*ut)) != sizeof(*ut))
802 log("utmp_write_direct: error writing %s: %s",
803 UTMP_FILE, strerror(errno));
811 # endif /* UTMP_USE_LIBRARY */
814 utmp_perform_login(struct logininfo *li)
818 construct_utmp(li, &ut);
819 # ifdef UTMP_USE_LIBRARY
820 if (!utmp_write_library(li, &ut)) {
821 log("utmp_perform_login: utmp_write_library() failed");
825 if (!utmp_write_direct(li, &ut)) {
826 log("utmp_perform_login: utmp_write_direct() failed");
835 utmp_perform_logout(struct logininfo *li)
839 construct_utmp(li, &ut);
840 # ifdef UTMP_USE_LIBRARY
841 if (!utmp_write_library(li, &ut)) {
842 log("utmp_perform_logout: utmp_write_library() failed");
846 if (!utmp_write_direct(li, &ut)) {
847 log("utmp_perform_logout: utmp_write_direct() failed");
856 utmp_write_entry(struct logininfo *li)
860 return utmp_perform_login(li);
863 return utmp_perform_logout(li);
866 log("utmp_write_entry: invalid type field");
870 #endif /* USE_UTMP */
874 ** Low-level utmpx functions
877 /* not much point if we don't want utmpx entries */
880 /* if we have the wherewithall, use pututxline etc. */
881 # if !defined(DISABLE_PUTUTXLINE) && defined(HAVE_SETUTXENT) && \
882 defined(HAVE_PUTUTXLINE)
883 # define UTMPX_USE_LIBRARY
887 /* write a utmpx entry with the system's help (pututxline() and pals) */
888 # ifdef UTMPX_USE_LIBRARY
890 utmpx_write_library(struct logininfo *li, struct utmpx *utx)
895 # ifdef HAVE_ENDUTXENT
901 # else /* UTMPX_USE_LIBRARY */
903 /* write a utmp entry direct to the file */
905 utmpx_write_direct(struct logininfo *li, struct utmpx *utx)
907 log("utmpx_write_direct: not implemented!");
910 # endif /* UTMPX_USE_LIBRARY */
913 utmpx_perform_login(struct logininfo *li)
917 construct_utmpx(li, &utx);
918 # ifdef UTMPX_USE_LIBRARY
919 if (!utmpx_write_library(li, &utx)) {
920 log("utmpx_perform_login: utmp_write_library() failed");
924 if (!utmpx_write_direct(li, &ut)) {
925 log("utmpx_perform_login: utmp_write_direct() failed");
934 utmpx_perform_logout(struct logininfo *li)
938 memset(&utx, '\0', sizeof(utx));
939 set_utmpx_time(li, &utx);
940 line_stripname(utx.ut_line, li->line, sizeof(utx.ut_line));
941 # ifdef HAVE_ID_IN_UTMPX
942 line_abbrevname(utx.ut_id, li->line, sizeof(utx.ut_id));
944 # ifdef HAVE_TYPE_IN_UTMPX
945 utx.ut_type = DEAD_PROCESS;
948 # ifdef UTMPX_USE_LIBRARY
949 utmpx_write_library(li, &utx);
951 utmpx_write_direct(li, &utx);
957 utmpx_write_entry(struct logininfo *li)
961 return utmpx_perform_login(li);
963 return utmpx_perform_logout(li);
965 log("utmpx_write_entry: invalid type field");
969 #endif /* USE_UTMPX */
973 ** Low-level wtmp functions
978 /* write a wtmp entry direct to the end of the file */
979 /* This is a slight modification of code in OpenBSD's logwtmp.c */
981 wtmp_write(struct logininfo *li, struct utmp *ut)
986 if ((fd = open(WTMP_FILE, O_WRONLY|O_APPEND, 0)) < 0) {
987 log("wtmp_write: problem writing %s: %s",
988 WTMP_FILE, strerror(errno));
991 if (fstat(fd, &buf) == 0)
992 if (atomicio(write, fd, ut, sizeof(*ut)) != sizeof(*ut)) {
993 ftruncate(fd, buf.st_size);
994 log("wtmp_write: problem writing %s: %s",
995 WTMP_FILE, strerror(errno));
1003 wtmp_perform_login(struct logininfo *li)
1007 construct_utmp(li, &ut);
1008 return wtmp_write(li, &ut);
1013 wtmp_perform_logout(struct logininfo *li)
1017 construct_utmp(li, &ut);
1018 return wtmp_write(li, &ut);
1023 wtmp_write_entry(struct logininfo *li)
1027 return wtmp_perform_login(li);
1029 return wtmp_perform_logout(li);
1031 log("wtmp_write_entry: invalid type field");
1037 /* Notes on fetching login data from wtmp/wtmpx
1039 * Logouts are usually recorded with (amongst other things) a blank
1040 * username on a given tty line. However, some systems (HP-UX is one)
1041 * leave all fields set, but change the ut_type field to DEAD_PROCESS.
1043 * Since we're only looking for logins here, we know that the username
1044 * must be set correctly. On systems that leave it in, we check for
1045 * ut_type==USER_PROCESS (indicating a login.)
1047 * Portability: Some systems may set something other than USER_PROCESS
1048 * to indicate a login process. I don't know of any as I write. Also,
1049 * it's possible that some systems may both leave the username in
1050 * place and not have ut_type.
1053 /* return true if this wtmp entry indicates a login */
1055 wtmp_islogin(struct logininfo *li, struct utmp *ut)
1057 if (strncmp(li->username, ut->ut_name,
1058 MIN_SIZEOF(li->username, ut->ut_name)) == 0) {
1059 # ifdef HAVE_TYPE_IN_UTMP
1060 if (ut->ut_type & USER_PROCESS)
1070 wtmp_get_entry(struct logininfo *li)
1076 /* Clear the time entries in our logininfo */
1077 li->tv_sec = li->tv_usec = 0;
1079 if ((fd = open(WTMP_FILE, O_RDONLY)) < 0) {
1080 log("wtmp_get_entry: problem opening %s: %s",
1081 WTMP_FILE, strerror(errno));
1084 if (fstat(fd, &st) != 0) {
1085 log("wtmp_get_entry: couldn't stat %s: %s",
1086 WTMP_FILE, strerror(errno));
1091 /* Seek to the start of the last struct utmp */
1092 if (lseek(fd, (off_t)(0 - sizeof(struct utmp)), SEEK_END) == -1) {
1093 /* Looks like we've got a fresh wtmp file */
1099 if (atomicio(read, fd, &ut, sizeof(ut)) != sizeof(ut)) {
1100 log("wtmp_get_entry: read of %s failed: %s",
1101 WTMP_FILE, strerror(errno));
1105 if ( wtmp_islogin(li, &ut) ) {
1107 /* We've already checked for a time in struct
1108 * utmp, in login_getlast(). */
1109 # ifdef HAVE_TIME_IN_UTMP
1110 li->tv_sec = ut.ut_time;
1112 # if HAVE_TV_IN_UTMP
1113 li->tv_sec = ut.ut_tv.tv_sec;
1116 line_fullname(li->line, ut.ut_line,
1117 MIN_SIZEOF(li->line, ut.ut_line));
1118 # ifdef HAVE_HOST_IN_UTMP
1119 strlcpy(li->hostname, ut.ut_host,
1120 MIN_SIZEOF(li->hostname, ut.ut_host));
1124 /* Seek back 2 x struct utmp */
1125 if (lseek(fd, (off_t)(0-2*sizeof(struct utmp)), SEEK_CUR) == -1) {
1126 /* We've found the start of the file, so quit */
1132 /* We found an entry. Tidy up and return */
1136 # endif /* USE_WTMP */
1140 ** Low-level wtmpx functions
1144 /* write a wtmpx entry direct to the end of the file */
1145 /* This is a slight modification of code in OpenBSD's logwtmp.c */
1147 wtmpx_write(struct logininfo *li, struct utmpx *utx)
1152 if ((fd = open(WTMPX_FILE, O_WRONLY|O_APPEND, 0)) < 0) {
1153 log("wtmpx_write: problem opening %s: %s",
1154 WTMPX_FILE, strerror(errno));
1158 if (fstat(fd, &buf) == 0)
1159 if (atomicio(write, fd, utx, sizeof(*utx)) != sizeof(*utx)) {
1160 ftruncate(fd, buf.st_size);
1161 log("wtmpx_write: problem writing %s: %s",
1162 WTMPX_FILE, strerror(errno));
1172 wtmpx_perform_login(struct logininfo *li)
1176 construct_utmpx(li, &utx);
1177 return wtmpx_write(li, &utx);
1182 wtmpx_perform_logout(struct logininfo *li)
1186 construct_utmpx(li, &utx);
1187 return wtmpx_write(li, &utx);
1192 wtmpx_write_entry(struct logininfo *li)
1196 return wtmpx_perform_login(li);
1198 return wtmpx_perform_logout(li);
1200 log("wtmpx_write_entry: invalid type field");
1205 /* Please see the notes above wtmp_islogin() for information about the
1206 next two functions */
1208 /* Return true if this wtmpx entry indicates a login */
1210 wtmpx_islogin(struct logininfo *li, struct utmpx *utx)
1212 if ( strncmp(li->username, utx->ut_name,
1213 MIN_SIZEOF(li->username, utx->ut_name)) == 0 ) {
1214 # ifdef HAVE_TYPE_IN_UTMPX
1215 if (utx->ut_type == USER_PROCESS)
1226 wtmpx_get_entry(struct logininfo *li)
1232 /* Clear the time entries */
1233 li->tv_sec = li->tv_usec = 0;
1235 if ((fd = open(WTMPX_FILE, O_RDONLY)) < 0) {
1236 log("wtmpx_get_entry: problem opening %s: %s",
1237 WTMPX_FILE, strerror(errno));
1240 if (fstat(fd, &st) != 0) {
1241 log("wtmpx_get_entry: couldn't stat %s: %s",
1242 WTMP_FILE, strerror(errno));
1247 /* Seek to the start of the last struct utmpx */
1248 if (lseek(fd, (off_t)(0-sizeof(struct utmpx)), SEEK_END) == -1 ) {
1249 /* probably a newly rotated wtmpx file */
1255 if (atomicio(read, fd, &utx, sizeof(utx)) != sizeof(utx)) {
1256 log("wtmpx_get_entry: read of %s failed: %s",
1257 WTMPX_FILE, strerror(errno));
1261 /* Logouts are recorded as a blank username on a particular line.
1262 * So, we just need to find the username in struct utmpx */
1263 if ( wtmpx_islogin(li, &utx) ) {
1264 # ifdef HAVE_TV_IN_UTMPX
1265 li->tv_sec = utx.ut_tv.tv_sec;
1267 # ifdef HAVE_TIME_IN_UTMPX
1268 li->tv_sec = utx.ut_time;
1271 line_fullname(li->line, utx.ut_line, sizeof(li->line));
1272 # ifdef HAVE_HOST_IN_UTMPX
1273 strlcpy(li->hostname, utx.ut_host,
1274 MIN_SIZEOF(li->hostname, utx.ut_host));
1278 if (lseek(fd, (off_t)(0-2*sizeof(struct utmpx)), SEEK_CUR) == -1) {
1287 #endif /* USE_WTMPX */
1290 ** Low-level libutil login() functions
1295 syslogin_perform_login(struct logininfo *li)
1299 if (! (ut = (struct utmp *)malloc(sizeof(*ut)))) {
1300 log("syslogin_perform_login: couldn't malloc()");
1303 construct_utmp(li, ut);
1310 syslogin_perform_logout(struct logininfo *li)
1315 (void)line_stripname(line, li->line, sizeof(line));
1317 if (!logout(line)) {
1318 log("syslogin_perform_logout: logout() returned an error");
1319 # ifdef HAVE_LOGWTMP
1321 logwtmp(line, "", "");
1324 /* FIXME: (ATL - if the need arises) What to do if we have
1325 * login, but no logout? what if logout but no logwtmp? All
1326 * routines are in libutil so they should all be there,
1333 syslogin_write_entry(struct logininfo *li)
1337 return syslogin_perform_login(li);
1339 return syslogin_perform_logout(li);
1341 log("syslogin_write_entry: Invalid type field");
1345 #endif /* USE_LOGIN */
1347 /* end of file log-syslogin.c */
1350 ** Low-level lastlog functions
1359 lastlog_construct(struct logininfo *li, struct lastlog *last)
1361 /* clear the structure */
1362 memset(last, '\0', sizeof(*last));
1364 (void)line_stripname(last->ll_line, li->line, sizeof(last->ll_line));
1365 strlcpy(last->ll_host, li->hostname,
1366 MIN_SIZEOF(last->ll_host, li->hostname));
1367 last->ll_time = li->tv_sec;
1371 lastlog_filetype(char *filename)
1375 if (stat(LASTLOG_FILE, &st) != 0) {
1376 log("lastlog_perform_login: Couldn't stat %s: %s", LASTLOG_FILE,
1380 if (S_ISDIR(st.st_mode))
1382 else if (S_ISREG(st.st_mode))
1389 /* open the file (using filemode) and seek to the login entry */
1391 lastlog_openseek(struct logininfo *li, int *fd, int filemode)
1395 char lastlog_file[1024];
1397 type = lastlog_filetype(LASTLOG_FILE);
1400 strlcpy(lastlog_file, LASTLOG_FILE, sizeof(lastlog_file));
1403 snprintf(lastlog_file, sizeof(lastlog_file), "%s/%s",
1404 LASTLOG_FILE, li->username);
1407 log("lastlog_openseek: %.100s is not a file or directory!",
1412 *fd = open(lastlog_file, filemode);
1414 debug("lastlog_openseek: Couldn't open %s: %s",
1415 lastlog_file, strerror(errno));
1419 if (type == LL_FILE) {
1420 /* find this uid's offset in the lastlog file */
1421 offset = (off_t) ( (long)li->uid * sizeof(struct lastlog));
1423 if ( lseek(*fd, offset, SEEK_SET) != offset ) {
1424 log("lastlog_openseek: %s->lseek(): %s",
1425 lastlog_file, strerror(errno));
1434 lastlog_perform_login(struct logininfo *li)
1436 struct lastlog last;
1439 /* create our struct lastlog */
1440 lastlog_construct(li, &last);
1442 if (!lastlog_openseek(li, &fd, O_RDWR|O_CREAT))
1445 /* write the entry */
1446 if (atomicio(write, fd, &last, sizeof(last)) != sizeof(last)) {
1448 log("lastlog_write_filemode: Error writing to %s: %s",
1449 LASTLOG_FILE, strerror(errno));
1458 lastlog_write_entry(struct logininfo *li)
1462 return lastlog_perform_login(li);
1464 log("lastlog_write_entry: Invalid type field");
1470 lastlog_populate_entry(struct logininfo *li, struct lastlog *last)
1472 line_fullname(li->line, last->ll_line, sizeof(li->line));
1473 strlcpy(li->hostname, last->ll_host,
1474 MIN_SIZEOF(li->hostname, last->ll_host));
1475 li->tv_sec = last->ll_time;
1479 lastlog_get_entry(struct logininfo *li)
1481 struct lastlog last;
1484 if (lastlog_openseek(li, &fd, O_RDONLY)) {
1485 if (atomicio(read, fd, &last, sizeof(last)) != sizeof(last)) {
1486 log("lastlog_get_entry: Error reading from %s: %s",
1487 LASTLOG_FILE, strerror(errno));
1490 lastlog_populate_entry(li, &last);
1497 #endif /* USE_LASTLOG */