2 Unix SMB/CIFS implementation.
4 Copyright (C) T.D.Lee@durham.ac.uk 1999
5 Heavily modified by Andrew Bartlett and Tridge, April 2001
7 This program is free software; you can redistribute it and/or modify
8 it under the terms of the GNU General Public License as published by
9 the Free Software Foundation; either version 3 of the License, or
10 (at your option) any later version.
12 This program is distributed in the hope that it will be useful,
13 but WITHOUT ANY WARRANTY; without even the implied warranty of
14 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
15 GNU General Public License for more details.
17 You should have received a copy of the GNU General Public License
18 along with this program. If not, see <http://www.gnu.org/licenses/>.
22 #include "smbd/smbd.h"
24 /****************************************************************************
25 Reflect connection status in utmp/wtmp files.
26 T.D.Lee@durham.ac.uk September 1999
28 With grateful thanks since then to many who have helped port it to
29 different operating systems. The variety of OS quirks thereby
30 uncovered is amazing...
33 o Always attempt to use programmatic interface (pututline() etc.)
34 Indeed, at present only programmatic use is supported.
35 o The only currently supported programmatic interface to "wtmp{,x}"
36 is through "updwtmp*()" routines.
37 o The "x" (utmpx/wtmpx; HAVE_UTMPX_H) seems preferable.
38 o The HAVE_* items should identify supported features.
39 o If at all possible, avoid "if defined(MY-OS)" constructions.
41 OS observations and status:
42 Almost every OS seems to have its own quirks.
45 Tested on 2.6 and 2.7; should be OK on other flavours.
47 Apparently has utmpx.h but doesn't implement.
49 Has utmpx.h, but (e.g.) no "getutmpx()". (Is this like AIX ?)
51 utmpx.h seems not to set default filenames. non-x better.
53 Not tested. Appears to have "x".
55 Not tested. Appears to lack "x".
58 "updwtmp*()" routines seem absent, so no current wtmp* support.
59 Has "ut_addr": probably trivial to implement (although remember
60 that IPv6 is coming...).
63 No "putut*()" type of interface.
64 No "ut_type" and associated defines.
65 Write files directly. Alternatively use its login(3)/logout(3).
67 Not tested. Resembles FreeBSD, but no login()/logout().
70 Should "lastlog" files, if any, be updated?
71 BSD systems (SunOS 4, FreeBSD):
72 o Prominent mention on man pages.
73 System-V (e.g. Solaris 2):
74 o No mention on man pages, even under "man -k".
75 o Has a "/var/adm/lastlog" file, but pututxline() etc. seem
77 o Despite downplaying (above), nevertheless has <lastlog.h>.
78 So perhaps UN*X "lastlog" facility is intended for tty/terminal only?
81 Each connection requires a small number (starting at 0, working up)
82 to represent the line. This must be unique within and across all
83 smbd processes. It is the 'id_num' from Samba's session.c code.
85 The 4 byte 'ut_id' component is vital to distinguish connections,
86 of which there could be several hundred or even thousand.
87 Entries seem to be printable characters, with optional NULL pads.
89 We need to be distinct from other entries in utmp/wtmp.
91 Observed things: therefore avoid them. Add to this list please.
92 From Solaris 2.x (because that's what I have):
93 'sN' : run-levels; N: [0-9]
95 'CC' : arbitrary things; C: [a-z]
96 'rXNN' : rlogin; N: [0-9]; X: [0-9a-z]
97 'tXNN' : rlogin; N: [0-9]; X: [0-9a-z]
99 'ftpZ' : ftp (Z is the number 255, aka 0377, aka 0xff)
100 Mostly a record uses the same 'ut_id' in both "utmp" and "wtmp",
101 but differences have been seen.
103 Arbitrarily I have chosen to use a distinctive 'SM' for the
106 The remaining two bytes encode the session 'id_num' (see above).
107 Our caller (session.c) should note our 16-bit limitation.
109 ****************************************************************************/
113 * Not WITH_UTMP? Simply supply dummy routines.
116 void sys_utmp_claim(const char *username, const char *hostname,
117 const char *ip_addr_str,
118 const char *id_str, int id_num)
121 void sys_utmp_yield(const char *username, const char *hostname,
122 const char *ip_addr_str,
123 const char *id_str, int id_num)
126 #else /* WITH_UTMP */
134 /* BSD systems: some may need lastlog.h (SunOS 4), some may not (FreeBSD) */
135 /* Some System-V systems (e.g. Solaris 2) declare this too. */
136 #ifdef HAVE_LASTLOG_H
140 /****************************************************************************
141 Default paths to various {u,w}tmp{,x} files.
142 ****************************************************************************/
146 static const char * const ux_pathname =
147 # if defined (UTMPX_FILE)
149 # elif defined (_UTMPX_FILE)
151 # elif defined (_PATH_UTMPX)
157 static const char * const wx_pathname =
158 # if defined (WTMPX_FILE)
160 # elif defined (_WTMPX_FILE)
162 # elif defined (_PATH_WTMPX)
168 #endif /* HAVE_UTMPX_H */
170 static const char * const ut_pathname =
171 # if defined (UTMP_FILE)
173 # elif defined (_UTMP_FILE)
175 # elif defined (_PATH_UTMP)
181 static const char * const wt_pathname =
182 # if defined (WTMP_FILE)
184 # elif defined (_WTMP_FILE)
186 # elif defined (_PATH_WTMP)
192 /* BSD-like systems might want "lastlog" support. */
193 #if 0 /* *** Not yet implemented */
194 #ifndef HAVE_PUTUTLINE /* see "pututline_my()" */
195 static const char *ll_pathname =
196 # if defined (_PATH_LASTLOG) /* what other names (if any?) */
200 # endif /* _PATH_LASTLOG */
201 #endif /* HAVE_PUTUTLINE */
205 * Get name of {u,w}tmp{,x} file.
206 * return: fname contains filename
207 * Possibly empty if this code not yet ported to this system.
209 * utmp{,x}: try "utmp dir", then default (a define)
210 * wtmp{,x}: try "wtmp dir", then "utmp dir", then default (a define)
212 static char *uw_pathname(TALLOC_CTX *ctx,
214 const char *uw_default)
216 char *dirname = NULL;
218 /* For w-files, first look for explicit "wtmp dir" */
219 if (uw_name[0] == 'w') {
220 dirname = talloc_strdup(ctx, lp_wtmpdir());
224 trim_char(dirname,'\0','/');
227 /* For u-files and non-explicit w-dir, look for "utmp dir" */
228 if ((dirname == NULL) || (strlen(dirname) == 0)) {
229 dirname = talloc_strdup(ctx, lp_utmpdir());
233 trim_char(dirname,'\0','/');
236 /* If explicit directory above, use it */
237 if (dirname && strlen(dirname) != 0) {
238 return talloc_asprintf(ctx,
244 /* No explicit directory: attempt to use default paths */
245 if (strlen(uw_default) == 0) {
246 /* No explicit setting, no known default.
247 * Has it yet been ported to this OS?
249 DEBUG(2,("uw_pathname: unable to determine pathname\n"));
251 return talloc_strdup(ctx, uw_default);
254 #ifndef HAVE_PUTUTLINE
255 /****************************************************************************
256 Update utmp file directly. No subroutine interface: probably a BSD system.
257 ****************************************************************************/
259 static void pututline_my(const char *uname, struct utmp *u, bool claim)
261 DEBUG(1,("pututline_my: not yet implemented\n"));
262 /* BSD implementor: may want to consider (or not) adjusting "lastlog" */
264 #endif /* HAVE_PUTUTLINE */
268 /****************************************************************************
269 Update wtmp file directly. No subroutine interface: probably a BSD system.
270 Credit: Michail Vidiassov <master@iaas.msu.ru>
271 ****************************************************************************/
273 static void updwtmp_my(const char *wname, struct utmp *u, bool claim)
281 * may use empty ut_name to distinguish a logout record.
283 * May need "if defined(SUNOS4)" etc. around some of these,
284 * but try to avoid if possible.
287 * man page indicates ut_name and ut_host both NULL
289 * man page appears not to specify (hints non-NULL)
290 * A correspondent suggest at least ut_name should be NULL
292 #if defined(HAVE_UT_UT_NAME)
293 memset((char *)&u->ut_name, '\0', sizeof(u->ut_name));
295 #if defined(HAVE_UT_UT_HOST)
296 memset((char *)&u->ut_host, '\0', sizeof(u->ut_host));
299 /* Stolen from logwtmp function in libutil.
300 * May be more locking/blocking is needed?
302 if ((fd = open(wname, O_WRONLY|O_APPEND, 0)) < 0)
304 if (fstat(fd, &buf) == 0) {
305 if (write(fd, (char *)u, sizeof(struct utmp)) != sizeof(struct utmp))
306 (void) ftruncate(fd, buf.st_size);
310 #endif /* HAVE_UPDWTMP */
312 /****************************************************************************
313 Update via utmp/wtmp (not utmpx/wtmpx).
314 ****************************************************************************/
316 static void utmp_nox_update(struct utmp *u, bool claim)
320 #if defined(PUTUTLINE_RETURNS_UTMP)
322 #endif /* PUTUTLINE_RETURNS_UTMP */
324 uname = uw_pathname(talloc_tos(), "utmp", ut_pathname);
328 DEBUG(2,("utmp_nox_update: uname:%s\n", uname));
330 #ifdef HAVE_PUTUTLINE
331 if (strlen(uname) != 0) {
335 # if defined(PUTUTLINE_RETURNS_UTMP)
340 DEBUG(2,("utmp_nox_update: pututline() failed\n"));
343 # else /* PUTUTLINE_RETURNS_UTMP */
347 # endif /* PUTUTLINE_RETURNS_UTMP */
349 #else /* HAVE_PUTUTLINE */
350 if (strlen(uname) != 0) {
351 pututline_my(uname, u, claim);
353 #endif /* HAVE_PUTUTLINE */
355 wname = uw_pathname(talloc_tos(), "wtmp", wt_pathname);
359 DEBUG(2,("utmp_nox_update: wname:%s\n", wname));
360 if (strlen(wname) != 0) {
364 * updwtmp() and the newer updwtmpx() may be unsymmetrical.
365 * At least one OS, Solaris 2.x declares the former in the
366 * "utmpx" (latter) file and context.
367 * In the Solaris case this is irrelevant: it has both and
368 * we always prefer the "x" case, so doesn't come here.
369 * But are there other systems, with no "x", which lack
373 updwtmp_my(wname, u, claim);
374 #endif /* HAVE_UPDWTMP */
378 /****************************************************************************
379 Copy a string in the utmp structure.
380 ****************************************************************************/
382 static void utmp_strcpy(char *dest, const char *src, size_t n)
386 memset(dest, '\0', n);
390 memcpy(dest, src, n);
393 memcpy(dest, src, len);
397 /****************************************************************************
398 Update via utmpx/wtmpx (preferred) or via utmp/wtmp.
399 ****************************************************************************/
401 static void sys_utmp_update(struct utmp *u, const char *hostname, bool claim)
403 #if !defined(HAVE_UTMPX_H)
404 /* No utmpx stuff. Drop to non-x stuff */
405 utmp_nox_update(u, claim);
406 #elif !defined(HAVE_PUTUTXLINE)
407 /* Odd. Have utmpx.h but no "pututxline()". Drop to non-x stuff */
408 DEBUG(1,("utmp_update: have utmpx.h but no pututxline() function\n"));
409 utmp_nox_update(u, claim);
410 #elif !defined(HAVE_GETUTMPX)
411 /* Odd. Have utmpx.h but no "getutmpx()". Drop to non-x stuff */
412 DEBUG(1,("utmp_update: have utmpx.h but no getutmpx() function\n"));
413 utmp_nox_update(u, claim);
414 #elif !defined(HAVE_UPDWTMPX)
415 /* Have utmpx.h but no "updwtmpx()". Drop to non-x stuff */
416 DEBUG(1,("utmp_update: have utmpx.h but no updwtmpx() function\n"));
417 utmp_nox_update(u, claim);
421 struct utmpx ux, *uxrc;
425 #if defined(HAVE_UX_UT_SYSLEN)
427 ux.ut_syslen = strlen(hostname) + 1; /* include end NULL */
431 #if defined(HAVE_UT_UT_HOST)
432 utmp_strcpy(ux.ut_host, hostname, sizeof(ux.ut_host));
435 uname = uw_pathname(talloc_tos(), "utmpx", ux_pathname);
436 wname = uw_pathname(talloc_tos(), "wtmpx", wx_pathname);
437 if (uname && wname) {
438 DEBUG(2,("utmp_update: uname:%s wname:%s\n", uname, wname));
442 * Check for either uname or wname being empty.
443 * Some systems, such as Redhat 6, have a "utmpx.h" which doesn't
444 * define default filenames.
445 * Also, our local installation has not provided an override.
446 * Drop to non-x method. (E.g. RH6 has good defaults in "utmp.h".)
448 if (!uname || !wname || (strlen(uname) == 0) || (strlen(wname) == 0)) {
449 utmp_nox_update(u, claim);
453 uxrc = pututxline(&ux);
456 DEBUG(2,("utmp_update: pututxline() failed\n"));
459 updwtmpx(wname, &ux);
461 #endif /* HAVE_UTMPX_H */
464 #if defined(HAVE_UT_UT_ID)
465 /****************************************************************************
466 Encode the unique connection number into "ut_id".
467 ****************************************************************************/
469 static int ut_id_encode(int i, char *fourbyte)
472 const char *ut_id_encstr = "0123456789abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ";
478 * Encode remaining 2 bytes from 'i'.
479 * 'ut_id_encstr' is the character set on which modulo arithmetic is done.
480 * Example: digits would produce the base-10 numbers from '001'.
482 nbase = strlen(ut_id_encstr);
484 fourbyte[3] = ut_id_encstr[i % nbase];
486 fourbyte[2] = ut_id_encstr[i % nbase];
489 return(i); /* 0: good; else overflow */
491 #endif /* defined(HAVE_UT_UT_ID) */
495 fill a system utmp structure given all the info we can gather
497 static bool sys_utmp_fill(struct utmp *u,
498 const char *username, const char *hostname,
499 const char *ip_addr_str,
500 const char *id_str, int id_num)
502 struct timeval timeval;
506 * Several (all?) systems seems to define one as the other.
507 * It is easier and clearer simply to let the following take its course,
508 * rather than to try to detect and optimise.
510 #if defined(HAVE_UT_UT_USER)
511 utmp_strcpy(u->ut_user, username, sizeof(u->ut_user));
512 #elif defined(HAVE_UT_UT_NAME)
513 utmp_strcpy(u->ut_name, username, sizeof(u->ut_name));
518 * If size limit proves troublesome, then perhaps use "ut_id_encode()".
520 if (strlen(id_str) > sizeof(u->ut_line)) {
521 DEBUG(1,("id_str [%s] is too long for %lu char utmp field\n",
522 id_str, (unsigned long)sizeof(u->ut_line)));
525 utmp_strcpy(u->ut_line, id_str, sizeof(u->ut_line));
527 #if defined(HAVE_UT_UT_PID)
528 u->ut_pid = sys_getpid();
533 * Some have one, some the other. Many have both, but defined (aliased).
534 * It is easier and clearer simply to let the following take its course.
535 * But note that we do the more precise ut_tv as the final assignment.
537 #if defined(HAVE_UT_UT_TIME)
538 GetTimeOfDay(&timeval);
539 u->ut_time = timeval.tv_sec;
540 #elif defined(HAVE_UT_UT_TV)
541 GetTimeOfDay(&timeval);
544 #error "with-utmp must have UT_TIME or UT_TV"
547 #if defined(HAVE_UT_UT_HOST)
548 utmp_strcpy(u->ut_host, hostname, sizeof(u->ut_host));
550 #if defined(HAVE_IPV6) && defined(HAVE_UT_UT_ADDR_V6)
551 memset(&u->ut_addr_v6, '\0', sizeof(u->ut_addr_v6));
553 struct in6_addr addr;
554 if (inet_pton(AF_INET6, ip_addr_str, &addr) > 0) {
555 memcpy(&u->ut_addr_v6, &addr, sizeof(addr));
558 #elif defined(HAVE_UT_UT_ADDR)
559 memset(&u->ut_addr, '\0', sizeof(u->ut_addr));
562 if (inet_pton(AF_INET, ip_addr_str, &addr) > 0) {
563 memcpy(&u->ut_addr, &addr, sizeof(addr));
567 * "(unsigned long) ut_addr" apparently exists on at least HP-UX 10.20.
568 * Volunteer to implement, please ...
572 #if defined(HAVE_UT_UT_ID)
573 if (ut_id_encode(id_num, u->ut_id) != 0) {
574 DEBUG(1,("utmp_fill: cannot encode id %d\n", id_num));
582 /****************************************************************************
584 ****************************************************************************/
586 void sys_utmp_yield(const char *username, const char *hostname,
587 const char *ip_addr_str,
588 const char *id_str, int id_num)
594 #if defined(HAVE_UT_UT_EXIT)
595 u.ut_exit.e_termination = 0;
596 u.ut_exit.e_exit = 0;
599 #if defined(HAVE_UT_UT_TYPE)
600 u.ut_type = DEAD_PROCESS;
603 if (!sys_utmp_fill(&u, username, hostname, ip_addr_str, id_str, id_num))
606 sys_utmp_update(&u, NULL, False);
609 /****************************************************************************
610 Claim a entry in whatever utmp system the OS uses.
611 ****************************************************************************/
613 void sys_utmp_claim(const char *username, const char *hostname,
614 const char *ip_addr_str,
615 const char *id_str, int id_num)
621 #if defined(HAVE_UT_UT_TYPE)
622 u.ut_type = USER_PROCESS;
625 if (!sys_utmp_fill(&u, username, hostname, ip_addr_str, id_str, id_num))
628 sys_utmp_update(&u, hostname, True);
631 #endif /* WITH_UTMP */