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1d7b9b20 | 1 | /* |
2 | * Copyright (c) 2000 Andre Lucas. All rights reserved. | |
564dd50a | 3 | * Portions copyright (c) 1998 Todd C. Miller |
4 | * Portions copyright (c) 1996 Jason Downs | |
5 | * Portions copyright (c) 1996 Theo de Raadt | |
1d7b9b20 | 6 | * |
7 | * Redistribution and use in source and binary forms, with or without | |
8 | * modification, are permitted provided that the following conditions | |
9 | * are met: | |
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. | |
20 | * | |
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. | |
31 | */ | |
32 | ||
33 | /** | |
34 | ** loginrec.c: platform-independent login recording and lastlog retrieval | |
35 | **/ | |
36 | ||
564dd50a | 37 | /* |
38 | The new login code explained | |
39 | ============================ | |
40 | ||
41 | This code attempts to provide a common interface to login recording | |
42 | (utmp and friends) and last login time retrieval. | |
43 | ||
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. | |
47 | ||
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 | |
51 | gets compiled here. | |
52 | ||
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 | |
56 | the old code. | |
57 | ||
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 | |
65 | specific indeed. | |
66 | ||
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 | |
71 | code should suffice. | |
72 | ||
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. | |
82 | ||
83 | Calling the new code | |
84 | -------------------- | |
85 | ||
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. | |
89 | ||
90 | Internal handler calling method | |
91 | ------------------------------- | |
92 | ||
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. | |
98 | ||
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. | |
103 | ||
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. | |
109 | ||
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, | |
115 | meaning "tilt". | |
116 | ||
117 | Maintenance | |
118 | ----------- | |
119 | ||
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. | |
124 | ||
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.) | |
128 | ||
129 | Otherwise, patches to the specific method(s) are very helpful! | |
130 | ||
131 | */ | |
132 | ||
1d7b9b20 | 133 | /** |
134 | ** TODO: | |
564dd50a | 135 | ** homegrown ttyslot()q |
136 | ** test, test, test | |
1d7b9b20 | 137 | ** |
138 | ** Platform status: | |
139 | ** ---------------- | |
140 | ** | |
141 | ** Known good: | |
142 | ** Linux (Redhat 6.2, need more variants) | |
143 | ** HP-UX 10.20 (gcc only) | |
144 | ** | |
145 | ** Testing required: Please send reports! | |
146 | ** Solaris | |
147 | ** IRIX | |
148 | ** NetBSD | |
149 | ** HP-UX 11 | |
a3cef3ca | 150 | ** AIX |
1d7b9b20 | 151 | ** |
152 | ** Platforms with known problems: | |
1d7b9b20 | 153 | ** NeXT |
154 | ** | |
155 | **/ | |
156 | ||
157 | #include "includes.h" | |
158 | ||
564dd50a | 159 | #if HAVE_UTMP_H |
160 | # include <utmp.h> | |
161 | #endif | |
162 | #if HAVE_UTMPX_H | |
163 | # include <utmpx.h> | |
164 | #endif | |
165 | #if HAVE_LASTLOG_H | |
166 | # include <lastlog.h> | |
167 | #endif | |
1d7b9b20 | 168 | |
169 | #include "ssh.h" | |
170 | #include "xmalloc.h" | |
171 | #include "loginrec.h" | |
172 | ||
173 | RCSID("$Id$"); | |
174 | ||
1d7b9b20 | 175 | /** |
176 | ** prototypes for helper functions in this file | |
177 | **/ | |
178 | ||
179 | #if HAVE_UTMP_H | |
1d7b9b20 | 180 | void set_utmp_time(struct logininfo *li, struct utmp *ut); |
181 | void construct_utmp(struct logininfo *li, struct utmp *ut); | |
182 | #endif | |
183 | ||
184 | #ifdef HAVE_UTMPX_H | |
1d7b9b20 | 185 | void set_utmpx_time(struct logininfo *li, struct utmpx *ut); |
186 | void construct_utmpx(struct logininfo *li, struct utmpx *ut); | |
187 | #endif | |
188 | ||
189 | int utmp_write_entry(struct logininfo *li); | |
190 | int utmpx_write_entry(struct logininfo *li); | |
191 | int wtmp_write_entry(struct logininfo *li); | |
192 | int wtmpx_write_entry(struct logininfo *li); | |
193 | int lastlog_write_entry(struct logininfo *li); | |
194 | int syslogin_write_entry(struct logininfo *li); | |
195 | ||
196 | int getlast_entry(struct logininfo *li); | |
197 | int lastlog_get_entry(struct logininfo *li); | |
198 | int wtmp_get_entry(struct logininfo *li); | |
199 | int wtmpx_get_entry(struct logininfo *li); | |
200 | ||
201 | ||
202 | /** | |
203 | ** platform-independent login functions | |
204 | **/ | |
205 | ||
564dd50a | 206 | /* Record a login */ |
207 | int | |
208 | login_login (struct logininfo *li) | |
209 | { | |
210 | li->type = LTYPE_LOGIN; | |
211 | return login_write(li); | |
212 | } | |
1d7b9b20 | 213 | |
214 | ||
564dd50a | 215 | /* Record a logout */ |
216 | int | |
217 | login_logout(struct logininfo *li) | |
218 | { | |
219 | li->type = LTYPE_LOGOUT; | |
220 | return login_write(li); | |
1d7b9b20 | 221 | } |
222 | ||
1d7b9b20 | 223 | |
564dd50a | 224 | /* Retrieve the last login time for a user (or fake on from wtmp/wtmpx) */ |
225 | unsigned int | |
226 | login_get_lastlog_time(const int uid) | |
227 | { | |
228 | struct logininfo li; | |
1d7b9b20 | 229 | |
564dd50a | 230 | login_get_lastlog(&li, uid); |
231 | return li.tv_sec; | |
232 | } | |
1d7b9b20 | 233 | |
564dd50a | 234 | /* Retrieve a lastlog entry (or fake one from wtmp/wtmpx) */ |
235 | struct logininfo * | |
236 | login_get_lastlog(struct logininfo *li, const int uid) | |
237 | { | |
238 | memset(li, '\0', sizeof(struct logininfo)); | |
1d7b9b20 | 239 | li->uid = uid; |
564dd50a | 240 | if (getlast_entry(li)) |
241 | return li; | |
242 | else | |
243 | return 0; | |
1d7b9b20 | 244 | } |
245 | ||
1d7b9b20 | 246 | |
564dd50a | 247 | /* login_alloc_entry() - allocate and initialise a logininfo */ |
248 | struct | |
249 | logininfo *login_alloc_entry(int pid, const char *username, | |
250 | const char *hostname, const char *line) | |
251 | { | |
252 | struct logininfo *newli; | |
1d7b9b20 | 253 | |
564dd50a | 254 | newli = (struct logininfo *) xmalloc (sizeof(struct logininfo)); |
255 | (void)login_init_entry(newli, pid, username, hostname, line); | |
256 | return newli; | |
1d7b9b20 | 257 | } |
258 | ||
259 | ||
564dd50a | 260 | /* login_free_entry() - free struct memory (trivial) */ |
1d7b9b20 | 261 | void |
564dd50a | 262 | login_free_entry(struct logininfo *li) |
263 | { | |
264 | xfree(li); | |
1d7b9b20 | 265 | } |
266 | ||
267 | ||
564dd50a | 268 | /* login_init_entry() - initialise a struct logininfo */ |
269 | int | |
270 | login_init_entry(struct logininfo *li, int pid, const char *username, | |
271 | const char *hostname, const char *line) | |
272 | { | |
273 | /* zero the structure */ | |
274 | memset(li, 0, sizeof(struct logininfo)); | |
275 | ||
276 | li->pid = pid; | |
277 | /* set the line information */ | |
278 | if (line) | |
279 | line_fullname(li->line, line, sizeof(li->line)); | |
1d7b9b20 | 280 | |
564dd50a | 281 | if (username) |
282 | strlcpy(li->username, username, sizeof(li->username)); | |
283 | if (hostname) | |
284 | strlcpy(li->hostname, hostname, sizeof(li->hostname)); | |
285 | return 1; | |
1d7b9b20 | 286 | } |
287 | ||
288 | ||
289 | void | |
564dd50a | 290 | login_set_current_time(struct logininfo *li) |
291 | { | |
1d7b9b20 | 292 | #ifdef HAVE_SYS_TIME_H |
293 | struct timeval tv; | |
294 | ||
295 | gettimeofday(&tv, NULL); | |
296 | li->tv_sec = tv.tv_sec ; li->tv_usec = tv.tv_usec; | |
297 | #else | |
564dd50a | 298 | time_t tm = time(0); |
299 | ||
300 | li->tv_sec = tm; li->tv_usec = 0; | |
1d7b9b20 | 301 | #endif |
302 | } | |
303 | ||
1d7b9b20 | 304 | |
564dd50a | 305 | /* copy a sockaddr_* into our logininfo */ |
1d7b9b20 | 306 | void |
564dd50a | 307 | login_set_addr(struct logininfo *li, const struct sockaddr *sa, |
308 | const unsigned int sa_size) | |
309 | { | |
310 | unsigned int bufsize = sa_size; | |
311 | ||
312 | /* make sure we don't overrun our union */ | |
313 | if (sizeof(li->hostaddr) < sa_size) | |
314 | bufsize = sizeof(li->hostaddr); | |
315 | ||
316 | memcpy((void *)&(li->hostaddr.sa), (const void *)sa, bufsize); | |
1d7b9b20 | 317 | } |
1d7b9b20 | 318 | |
564dd50a | 319 | |
320 | /** | |
321 | ** login_write: Call low-level recording functions based on autoconf | |
322 | ** results | |
323 | **/ | |
1d7b9b20 | 324 | |
325 | int | |
564dd50a | 326 | login_write (struct logininfo *li) |
327 | { | |
1d7b9b20 | 328 | if ((int)geteuid() != 0) { |
329 | log("Attempt to write login records by non-root user (aborting)"); | |
330 | return 1; | |
331 | } | |
332 | /* set the timestamp */ | |
333 | login_set_current_time(li); | |
334 | #ifdef USE_LOGIN | |
335 | syslogin_write_entry(li); | |
336 | #endif | |
337 | #ifdef USE_LASTLOG | |
338 | if (li->type == LTYPE_LOGIN) { | |
339 | lastlog_write_entry(li); | |
340 | } | |
341 | #endif | |
342 | #ifdef USE_UTMP | |
343 | utmp_write_entry(li); | |
344 | #endif | |
345 | #ifdef USE_WTMP | |
346 | wtmp_write_entry(li); | |
347 | #endif | |
348 | #ifdef USE_UTMPX | |
349 | utmpx_write_entry(li); | |
350 | #endif | |
351 | #ifdef USE_WTMPX | |
352 | wtmpx_write_entry(li); | |
353 | #endif | |
354 | return 0; | |
355 | } | |
356 | ||
1d7b9b20 | 357 | |
564dd50a | 358 | /** |
359 | ** getlast_entry: Call low-level functions to retrieve the last login | |
360 | ** time. | |
361 | **/ | |
1d7b9b20 | 362 | |
564dd50a | 363 | /* take the uid in li and return the last login time */ |
1d7b9b20 | 364 | int |
564dd50a | 365 | getlast_entry(struct logininfo *li) |
366 | { | |
367 | #ifdef USE_LASTLOG | |
368 | if (lastlog_get_entry(li)) | |
369 | return 1; | |
1d7b9b20 | 370 | else |
371 | return 0; | |
564dd50a | 372 | #else |
373 | /* !USE_LASTLOG */ | |
1d7b9b20 | 374 | |
3f45f1c3 | 375 | # ifdef DISABLE_LASTLOG |
376 | /* On some systems we shouldn't even try to obtain last login | |
377 | * time, e.g. AIX */ | |
378 | return 0; | |
379 | ||
380 | # else | |
564dd50a | 381 | /* Try to retrieve the last login time from wtmp */ |
3f45f1c3 | 382 | # if defined(USE_WTMP) && (defined(HAVE_TIME_IN_UTMP) || defined(HAVE_TV_IN_UTMP)) |
564dd50a | 383 | /* retrieve last login time from utmp */ |
384 | if (wtmp_get_entry(li)) | |
385 | return 1; | |
1d7b9b20 | 386 | else |
387 | return 0; | |
3f45f1c3 | 388 | # else |
1d7b9b20 | 389 | |
564dd50a | 390 | /* If wtmp isn't available, try wtmpx */ |
1d7b9b20 | 391 | |
3f45f1c3 | 392 | # if defined(USE_WTMPX) && (defined(HAVE_TIME_IN_UTMPX) || defined(HAVE_TV_IN_UTMPX)) |
564dd50a | 393 | /* retrieve last login time from utmpx */ |
394 | if (wtmpx_get_entry(li)) | |
395 | return 1; | |
1d7b9b20 | 396 | else |
397 | return 0; | |
3f45f1c3 | 398 | # else |
1d7b9b20 | 399 | |
564dd50a | 400 | /* Give up: No means of retrieving last login time */ |
401 | return 0; | |
3f45f1c3 | 402 | # endif |
403 | /* USE_WTMPX && (HAVE_TIME_IN_UTMPX || HAVE_TV_IN_UTMPX) */ | |
404 | ||
564dd50a | 405 | # endif |
3f45f1c3 | 406 | /* USE_WTMP && (HAVE_TIME_IN_UTMP || HAVE_TV_IN_UTMP) */ |
564dd50a | 407 | # endif |
3f45f1c3 | 408 | /* DISABLE_LASTLOG */ |
564dd50a | 409 | #endif |
410 | /* USE_LASTLOG */ | |
411 | } | |
1d7b9b20 | 412 | |
413 | ||
1d7b9b20 | 414 | |
415 | /* | |
564dd50a | 416 | * 'line' string utility functions |
417 | * | |
418 | * These functions process the 'line' string into one of three forms: | |
419 | * | |
1d7b9b20 | 420 | * 1. The full filename (including '/dev') |
421 | * 2. The stripped name (excluding '/dev') | |
564dd50a | 422 | * 3. The abbreviated name (e.g. /dev/ttyp00 -> yp00 |
423 | * /dev/pts/1 -> ts/1 ) | |
1d7b9b20 | 424 | * |
425 | * Form 3 is used on some systems to identify a .tmp.? entry when | |
426 | * attempting to remove it. Typically both addition and removal is | |
564dd50a | 427 | * performed by one application - say, sshd - so as long as the choice |
428 | * uniquely identifies a terminal it's ok. | |
1d7b9b20 | 429 | */ |
430 | ||
431 | ||
564dd50a | 432 | /* line_fullname(): add the leading '/dev/' if it doesn't exist make |
433 | * sure dst has enough space, if not just copy src (ugh) */ | |
1d7b9b20 | 434 | char * |
564dd50a | 435 | line_fullname(char *dst, const char *src, int dstsize) |
436 | { | |
1d7b9b20 | 437 | memset(dst, '\0', dstsize); |
438 | if ((strncmp(src, "/dev/", 5) == 0) || (dstsize < (strlen(src) + 5))) | |
439 | strlcpy(dst, src, dstsize); | |
440 | else { | |
441 | strlcpy(dst, "/dev/", 5); | |
442 | strlcat(dst, src, dstsize); | |
443 | } | |
444 | return dst; | |
445 | } | |
446 | ||
564dd50a | 447 | |
448 | /* line_stripname(): strip the leading '/dev' if it exists, return dst */ | |
1d7b9b20 | 449 | char * |
564dd50a | 450 | line_stripname(char *dst, const char *src, int dstsize) |
451 | { | |
1d7b9b20 | 452 | memset(dst, '\0', dstsize); |
453 | if (strncmp(src, "/dev/", 5) == 0) | |
454 | strlcpy(dst, &src[5], dstsize); | |
455 | else | |
456 | strlcpy(dst, src, dstsize); | |
457 | return dst; | |
564dd50a | 458 | } |
459 | ||
1d7b9b20 | 460 | |
564dd50a | 461 | /* line_abbrevname(): Return the abbreviated (usually four-character) |
462 | * form of the line (Just use the last <dstsize> characters of the | |
463 | * full name.) | |
464 | * | |
465 | * NOTE: use strncpy because we do NOT necessarily want zero | |
466 | * termination */ | |
1d7b9b20 | 467 | char * |
468 | line_abbrevname(char *dst, const char *src, int dstsize) { | |
469 | memset(dst, '\0', dstsize); | |
564dd50a | 470 | src += (strlen(src) - dstsize); |
471 | strncpy(dst, src, dstsize); /* note: _don't_ change this to strlcpy */ | |
1d7b9b20 | 472 | return dst; |
473 | } | |
474 | ||
475 | ||
476 | /** | |
477 | ** utmp utility functions | |
564dd50a | 478 | ** |
479 | ** These functions manipulate struct utmp, taking system differences | |
480 | ** into account. | |
1d7b9b20 | 481 | **/ |
482 | ||
483 | #if defined(USE_UTMP) || defined (USE_WTMP) || defined (USE_LOGIN) | |
484 | ||
1d7b9b20 | 485 | /* build the utmp structure */ |
486 | void | |
564dd50a | 487 | set_utmp_time(struct logininfo *li, struct utmp *ut) |
488 | { | |
1d7b9b20 | 489 | #ifdef HAVE_TV_IN_UTMP |
490 | ut->ut_tv.tv_sec = li->tv_sec; | |
491 | ut->ut_tv.tv_usec = li->tv_usec; | |
492 | #else | |
493 | # ifdef HAVE_TIME_IN_UTMP | |
494 | ut->ut_time = li->tv_sec; | |
495 | # endif | |
496 | #endif | |
497 | } | |
498 | ||
564dd50a | 499 | |
1d7b9b20 | 500 | void |
501 | construct_utmp(struct logininfo *li, | |
564dd50a | 502 | struct utmp *ut) |
503 | { | |
1d7b9b20 | 504 | memset(ut, '\0', sizeof(struct utmp)); |
1d7b9b20 | 505 | #ifdef HAVE_ID_IN_UTMP |
506 | line_abbrevname(ut->ut_id, li->line, sizeof(ut->ut_id)); | |
507 | #endif | |
508 | ||
509 | #ifdef HAVE_TYPE_IN_UTMP | |
564dd50a | 510 | /* This is done here to keep utmp constants out of login.h */ |
1d7b9b20 | 511 | switch (li->type) { |
512 | case LTYPE_LOGIN: | |
513 | ut->ut_type = USER_PROCESS; | |
514 | break; | |
515 | case LTYPE_LOGOUT: | |
516 | ut->ut_type = DEAD_PROCESS; | |
517 | break; | |
518 | } | |
519 | #endif | |
520 | ||
521 | #ifdef HAVE_PID_IN_UTMP | |
522 | ut->ut_pid = li->pid; | |
523 | #endif | |
524 | line_stripname(ut->ut_line, li->line, sizeof(ut->ut_line)); | |
525 | strlcpy(ut->ut_name, li->username, sizeof(ut->ut_name)); | |
526 | set_utmp_time(li, ut); | |
527 | #ifdef HAVE_HOST_IN_UTMP | |
528 | strlcpy(ut->ut_host, li->hostname, sizeof(ut->ut_host)); | |
529 | #endif | |
530 | #ifdef HAVE_ADDR_IN_UTMP | |
564dd50a | 531 | /* this is just a 32-bit IP address */ |
532 | if (li->hostaddr.sa.sa_family == AF_INET) | |
533 | ut->ut_addr = li->hostaddr.sa_in.sin_addr.s_addr; | |
534 | #endif | |
535 | } | |
1d7b9b20 | 536 | |
537 | #endif | |
538 | /* USE_UTMP || USE_WTMP || USE_LOGIN */ | |
539 | ||
564dd50a | 540 | |
541 | ||
1d7b9b20 | 542 | /** |
543 | ** utmpx utility functions | |
564dd50a | 544 | ** |
545 | ** These functions manipulate struct utmpx, accounting for system | |
546 | ** variations. | |
1d7b9b20 | 547 | **/ |
548 | ||
549 | #if defined(USE_UTMPX) || defined (USE_WTMPX) | |
550 | ||
1d7b9b20 | 551 | /* build the utmpx structure */ |
552 | void | |
564dd50a | 553 | set_utmpx_time(struct logininfo *li, struct utmpx *utx) |
554 | { | |
1d7b9b20 | 555 | #ifdef HAVE_TV_IN_UTMPX |
556 | utx->ut_tv.tv_sec = li->tv_sec; | |
557 | utx->ut_tv.tv_usec = li->tv_usec; | |
558 | #else | |
559 | # ifdef HAVE_TIME_IN_UTMPX | |
560 | utx->ut_time = li->tv_sec; | |
561 | # endif | |
562 | #endif | |
563 | } | |
564 | ||
564dd50a | 565 | |
1d7b9b20 | 566 | void |
564dd50a | 567 | construct_utmpx(struct logininfo *li, struct utmpx *utx) |
568 | { | |
1d7b9b20 | 569 | memset(utx, '\0', sizeof(struct utmpx)); |
1d7b9b20 | 570 | line_abbrevname(utx->ut_id, li->line, sizeof(utx->ut_id)); |
571 | ||
572 | /* this is done here to keep utmp constants out of loginrec.h */ | |
573 | switch (li->type) { | |
574 | case LTYPE_LOGIN: | |
575 | utx->ut_type = USER_PROCESS; | |
576 | break; | |
577 | case LTYPE_LOGOUT: | |
578 | utx->ut_type = DEAD_PROCESS; | |
579 | break; | |
580 | } | |
1d7b9b20 | 581 | utx->ut_pid = li->pid; |
582 | line_stripname(utx->ut_line, li->line, sizeof(utx->ut_line)); | |
583 | strlcpy(utx->ut_name, li->username, sizeof(utx->ut_name)); | |
584 | set_utmpx_time(li, utx); | |
585 | #ifdef HAVE_HOST_IN_UTMPX | |
586 | strlcpy(utx->ut_host, li->hostname, sizeof(utx->ut_host)); | |
587 | #endif | |
588 | #ifdef HAVE_ADDR_IN_UTMPX | |
564dd50a | 589 | /* FIXME: (ATL) not supported yet */ |
1d7b9b20 | 590 | #endif |
591 | #ifdef HAVE_SYSLEN_IN_UTMPX | |
592 | /* this is safe because of the extra nulls in logininfo */ | |
593 | utx->ut_syslen = strlen(li->hostname); | |
594 | #endif | |
564dd50a | 595 | } |
1d7b9b20 | 596 | |
597 | #endif | |
598 | /* USE_UTMPX || USE_WTMPX */ | |
599 | ||
600 | ||
601 | ||
602 | /** | |
564dd50a | 603 | ** Low-level utmp functions |
1d7b9b20 | 604 | **/ |
605 | ||
606 | /* FIXME: (ATL) utmp_write_direct needs testing */ | |
607 | ||
608 | #ifdef USE_UTMP | |
609 | ||
1d7b9b20 | 610 | /* if we can, use pututline() etc. */ |
611 | #if !defined(DISABLE_PUTUTLINE) && defined(HAVE_SETUTENT) && \ | |
612 | defined(HAVE_PUTUTLINE) | |
613 | # define UTMP_USE_LIBRARY | |
614 | #endif | |
615 | ||
616 | ||
617 | /* write a utmp entry with the system's help (pututline() and pals) */ | |
618 | #ifdef UTMP_USE_LIBRARY | |
619 | static int | |
564dd50a | 620 | utmp_write_library(struct logininfo *li, struct utmp *ut) |
621 | { | |
1d7b9b20 | 622 | setutent(); |
623 | pututline(ut); | |
624 | ||
625 | #ifdef HAVE_ENDUTENT | |
626 | endutent(); | |
627 | #endif | |
628 | return 1; | |
564dd50a | 629 | } |
1d7b9b20 | 630 | |
631 | #else | |
632 | ||
633 | /* write a utmp entry direct to the file */ | |
564dd50a | 634 | /* This is a slightly modification of code in OpenBSD's login.c */ |
1d7b9b20 | 635 | static int |
564dd50a | 636 | utmp_write_direct(struct logininfo *li, struct utmp *ut) |
637 | { | |
1d7b9b20 | 638 | struct utmp old_ut; |
639 | register int fd; | |
640 | int tty; | |
641 | ||
642 | tty = ttyslot(); /* seems only to work for /dev/ttyp? style names */ | |
643 | ||
644 | if (tty > 0 && (fd = open(UTMP_FILE, O_RDWR|O_CREAT, 0644)) >= 0) { | |
645 | (void)lseek(fd, (off_t)(tty * sizeof(struct utmp)), SEEK_SET); | |
646 | /* | |
647 | * Prevent luser from zero'ing out ut_host. | |
648 | * If the new ut_line is empty but the old one is not | |
649 | * and ut_line and ut_name match, preserve the old ut_line. | |
650 | */ | |
651 | if ( read(fd, &old_ut, sizeof(struct utmp)) == sizeof(struct utmp) | |
652 | && ut->ut_host[0] == '\0' | |
653 | && old_ut.ut_host[0] != '\0' | |
654 | && strncmp(old_ut.ut_line, ut->ut_line, sizeof(ut->ut_line)) == 0 | |
655 | && strncmp(old_ut.ut_name, ut->ut_name, sizeof(ut->ut_name)) == 0 ) | |
656 | (void)memcpy(ut->ut_host, old_ut.ut_host, sizeof(ut->ut_host)); | |
657 | ||
658 | (void)lseek(fd, (off_t)(tty * sizeof(struct utmp)), SEEK_SET); | |
659 | if (write(fd, ut, sizeof(struct utmp))==-1) | |
660 | log("utmp_write_direct: error writing %s: %s", | |
661 | UTMP_FILE, strerror(errno)); | |
662 | ||
663 | (void)close(fd); | |
664 | return 1; | |
665 | } else | |
666 | return 0; | |
564dd50a | 667 | } |
1d7b9b20 | 668 | #endif /* UTMP_USE_LIBRARY */ |
669 | ||
670 | ||
671 | static int | |
564dd50a | 672 | utmp_perform_login(struct logininfo *li) |
673 | { | |
1d7b9b20 | 674 | struct utmp ut; |
675 | ||
676 | construct_utmp(li, &ut); | |
1d7b9b20 | 677 | #ifdef UTMP_USE_LIBRARY |
678 | if (!utmp_write_library(li, &ut)) { | |
679 | log("utmp_perform_login: utmp_write_library() failed"); | |
680 | return 0; | |
681 | } | |
682 | #else | |
683 | if (!utmp_write_direct(li, &ut)) { | |
684 | log("utmp_perform_login: utmp_write_direct() failed"); | |
685 | return 0; | |
686 | } | |
687 | #endif | |
688 | return 1; | |
564dd50a | 689 | } |
1d7b9b20 | 690 | |
691 | ||
692 | static int | |
564dd50a | 693 | utmp_perform_logout(struct logininfo *li) |
694 | { | |
1d7b9b20 | 695 | struct utmp ut; |
696 | ||
697 | memset(&ut, '\0', sizeof(ut)); | |
698 | set_utmp_time(li, &ut); | |
699 | line_stripname(ut.ut_line, li->line, sizeof(ut.ut_line)); | |
700 | #ifdef HAVE_ID_IN_UTMP | |
701 | line_abbrevname(ut.ut_id, li->line, sizeof(ut.ut_id)); | |
702 | #endif | |
703 | #ifdef HAVE_TYPE_IN_UTMP | |
704 | ut.ut_type = DEAD_PROCESS; | |
705 | #endif | |
706 | ||
707 | #if !defined(DISABLE_PUTUTLINE) \ | |
708 | && defined(HAVE_SETUTENT) && defined(HAVE_PUTUTLINE) | |
709 | utmp_write_library(li, &ut); | |
710 | #else | |
711 | utmp_write_direct(li, &ut); | |
712 | #endif | |
713 | ||
714 | return 1; | |
564dd50a | 715 | } |
1d7b9b20 | 716 | |
717 | ||
718 | int | |
564dd50a | 719 | utmp_write_entry(struct logininfo *li) |
720 | { | |
1d7b9b20 | 721 | switch(li->type) { |
722 | case LTYPE_LOGIN: | |
723 | return utmp_perform_login(li); | |
724 | ||
725 | case LTYPE_LOGOUT: | |
726 | return utmp_perform_logout(li); | |
727 | ||
728 | default: | |
729 | log("utmp_write_entry: invalid type field"); | |
730 | return 0; | |
731 | } | |
564dd50a | 732 | } |
1d7b9b20 | 733 | |
734 | ||
735 | #endif | |
736 | /* USE_UTMP */ | |
737 | ||
738 | ||
739 | /** | |
564dd50a | 740 | ** Low-level utmpx functions |
1d7b9b20 | 741 | **/ |
742 | ||
743 | /* not much point if we don't want utmpx entries */ | |
744 | #ifdef USE_UTMPX | |
745 | ||
1d7b9b20 | 746 | /* if we have the wherewithall, use pututxline etc. */ |
747 | #if !defined(DISABLE_PUTUTXLINE) && defined(HAVE_SETUTXENT) \ | |
748 | && defined(HAVE_PUTUTXLINE) | |
749 | # define UTMPX_USE_LIBRARY | |
750 | #endif | |
751 | ||
752 | ||
753 | /* write a utmpx entry with the system's help (pututxline() and pals) */ | |
754 | #ifdef UTMPX_USE_LIBRARY | |
755 | static int | |
564dd50a | 756 | utmpx_write_library(struct logininfo *li, struct utmpx *utx) |
757 | { | |
1d7b9b20 | 758 | setutxent(); |
759 | pututxline(utx); | |
760 | ||
761 | #ifdef HAVE_ENDUTXENT | |
762 | endutxent(); | |
763 | #endif | |
764 | return 1; | |
564dd50a | 765 | } |
1d7b9b20 | 766 | |
767 | #else | |
768 | /* UTMPX_USE_LIBRARY */ | |
769 | ||
770 | ||
771 | /* write a utmp entry direct to the file */ | |
772 | static int | |
564dd50a | 773 | utmpx_write_direct(struct logininfo *li, struct utmpx *utx) |
774 | { | |
1d7b9b20 | 775 | log("utmpx_write_direct: not implemented!"); |
776 | return 0; | |
564dd50a | 777 | } |
1d7b9b20 | 778 | |
779 | #endif | |
780 | /* UTMPX_USE_LIBRARY */ | |
781 | ||
782 | static int | |
564dd50a | 783 | utmpx_perform_login(struct logininfo *li) |
784 | { | |
1d7b9b20 | 785 | struct utmpx utx; |
786 | ||
787 | construct_utmpx(li, &utx); | |
1d7b9b20 | 788 | #ifdef UTMPX_USE_LIBRARY |
789 | if (!utmpx_write_library(li, &utx)) { | |
790 | log("utmpx_perform_login: utmp_write_library() failed"); | |
791 | return 0; | |
792 | } | |
793 | #else | |
794 | if (!utmpx_write_direct(li, &ut)) { | |
795 | log("utmpx_perform_login: utmp_write_direct() failed"); | |
796 | return 0; | |
797 | } | |
798 | #endif | |
799 | return 1; | |
564dd50a | 800 | } |
1d7b9b20 | 801 | |
802 | ||
803 | static int | |
564dd50a | 804 | utmpx_perform_logout(struct logininfo *li) |
805 | { | |
1d7b9b20 | 806 | struct utmpx utx; |
807 | ||
808 | memset(&utx, '\0', sizeof(utx)); | |
809 | set_utmpx_time(li, &utx); | |
810 | line_stripname(utx.ut_line, li->line, sizeof(utx.ut_line)); | |
811 | #ifdef HAVE_ID_IN_UTMPX | |
812 | line_abbrevname(utx.ut_id, li->line, sizeof(utx.ut_id)); | |
813 | #endif | |
814 | #ifdef HAVE_TYPE_IN_UTMPX | |
815 | utx.ut_type = DEAD_PROCESS; | |
816 | #endif | |
817 | ||
818 | #ifdef UTMPX_USE_LIBRARY | |
819 | utmpx_write_library(li, &utx); | |
820 | #else | |
821 | utmpx_write_direct(li, &utx); | |
822 | #endif | |
1d7b9b20 | 823 | return 1; |
564dd50a | 824 | } |
1d7b9b20 | 825 | |
826 | ||
827 | int | |
564dd50a | 828 | utmpx_write_entry(struct logininfo *li) |
829 | { | |
1d7b9b20 | 830 | switch(li->type) { |
831 | case LTYPE_LOGIN: | |
832 | return utmpx_perform_login(li); | |
833 | case LTYPE_LOGOUT: | |
834 | return utmpx_perform_logout(li); | |
835 | default: | |
836 | log("utmpx_write_entry: invalid type field"); | |
837 | return 0; | |
838 | } | |
564dd50a | 839 | } |
1d7b9b20 | 840 | |
841 | ||
842 | #endif | |
843 | /* USE_UTMPX */ | |
844 | ||
845 | ||
846 | /** | |
564dd50a | 847 | ** Low-level wtmp functions |
1d7b9b20 | 848 | **/ |
849 | ||
850 | #ifdef USE_WTMP | |
851 | ||
1d7b9b20 | 852 | /* write a wtmp entry direct to the end of the file */ |
564dd50a | 853 | /* This is a slight modification of code in OpenBSD's logwtmp.c */ |
1d7b9b20 | 854 | static int |
564dd50a | 855 | wtmp_write(struct logininfo *li, struct utmp *ut) |
856 | { | |
1d7b9b20 | 857 | struct stat buf; |
858 | int fd, ret = 1; | |
859 | ||
860 | if ((fd = open(WTMP_FILE, O_WRONLY|O_APPEND, 0)) < 0) { | |
861 | log("wtmp_write: problem writing %s: %s", | |
862 | WTMP_FILE, strerror(errno)); | |
863 | return 0; | |
864 | } | |
564dd50a | 865 | if (fstat(fd, &buf) == 0) |
1d7b9b20 | 866 | if (write(fd, (char *)ut, sizeof(struct utmp)) != |
867 | sizeof(struct utmp)) { | |
868 | ftruncate(fd, buf.st_size); | |
869 | log("wtmp_write: problem writing %s: %s", | |
870 | WTMP_FILE, strerror(errno)); | |
871 | ret = 0; | |
872 | } | |
873 | (void)close(fd); | |
1d7b9b20 | 874 | return ret; |
564dd50a | 875 | } |
1d7b9b20 | 876 | |
877 | ||
878 | static int | |
564dd50a | 879 | wtmp_perform_login(struct logininfo *li){ |
1d7b9b20 | 880 | struct utmp ut; |
881 | ||
882 | construct_utmp(li, &ut); | |
883 | return wtmp_write(li, &ut); | |
564dd50a | 884 | } |
1d7b9b20 | 885 | |
886 | ||
887 | static int | |
564dd50a | 888 | wtmp_perform_logout(struct logininfo *li) |
889 | { | |
1d7b9b20 | 890 | struct utmp ut; |
891 | ||
892 | construct_utmp(li, &ut); | |
893 | /* blank out unnecessary fields */ | |
894 | memset(&(ut.ut_name), '\0', sizeof(ut.ut_name)); | |
895 | #ifdef HAVE_ID_IN_UTMP | |
896 | memset(&(ut.ut_id), '\0', sizeof(ut.ut_id)); | |
897 | #endif | |
898 | #ifdef HAVE_HOST_IN_UTMP | |
899 | memset(&(ut.ut_host), '\0', sizeof(ut.ut_host)); | |
900 | #endif | |
901 | #ifdef HAVE_ADDR_IN_UTMP | |
902 | memset(&(ut.ut_addr), '\0', sizeof(ut.ut_addr)); | |
903 | #endif | |
904 | return wtmp_write(li, &ut); | |
564dd50a | 905 | } |
1d7b9b20 | 906 | |
907 | ||
908 | int | |
564dd50a | 909 | wtmp_write_entry(struct logininfo *li) |
910 | { | |
1d7b9b20 | 911 | switch(li->type) { |
912 | case LTYPE_LOGIN: | |
913 | return wtmp_perform_login(li); | |
914 | case LTYPE_LOGOUT: | |
915 | return wtmp_perform_logout(li); | |
916 | default: | |
917 | log("wtmp_write_entry: invalid type field"); | |
918 | return 0; | |
919 | } | |
564dd50a | 920 | } |
1d7b9b20 | 921 | |
922 | ||
923 | int | |
564dd50a | 924 | wtmp_get_entry(struct logininfo *li) |
925 | { | |
1d7b9b20 | 926 | struct stat st; |
927 | struct utmp ut; | |
928 | int fd; | |
929 | ||
930 | if ((fd = open(WTMP_FILE, O_RDONLY)) < 0) { | |
931 | log("wtmp_get_entry: problem opening %s: %s", | |
932 | WTMP_FILE, strerror(errno)); | |
933 | return 0; | |
934 | } | |
564dd50a | 935 | if (fstat(fd, &st) != 0) { |
1d7b9b20 | 936 | log("wtmp_get_entry: couldn't stat %s: %s", |
937 | WTMP_FILE, strerror(errno)); | |
938 | close(fd); | |
939 | return 0; | |
940 | } | |
1d7b9b20 | 941 | (void)lseek(fd, (off_t)(0-sizeof(struct utmp)), SEEK_END); |
942 | ||
943 | do { | |
944 | if (read(fd, &ut, sizeof(ut)) != sizeof(ut)) { | |
945 | log("wtmp_get_entry: read of %s failed: %s", | |
946 | WTMP_FILE, strerror(errno)); | |
947 | close (fd); | |
948 | return 0; | |
949 | } | |
1d7b9b20 | 950 | /* Logouts are recorded as a blank username on a particular line. |
951 | * So, we just need to find the username in struct utmp */ | |
952 | if ( strncmp(li->username, ut.ut_user, 8) == 0 ) { | |
953 | /* note we've already made sure there's a time in struct utmp */ | |
954 | #ifdef HAVE_TIME_IN_UTMP | |
955 | li->tv_sec = ut.ut_time; | |
956 | #else | |
957 | # if HAVE_TV_IN_UTMP | |
958 | li->tv_sec = ut.ut_tv.tv_sec; | |
959 | # endif | |
960 | #endif | |
961 | line_fullname(li->line, ut.ut_line, sizeof(ut.ut_line)); | |
962 | #ifdef HAVE_HOST_IN_UTMP | |
963 | strlcpy(li->hostname, ut.ut_host, sizeof(ut.ut_host)); | |
964 | #endif | |
965 | } | |
966 | if (lseek(fd, (off_t)(0-2*sizeof(struct utmp)), SEEK_CUR) == -1) { | |
967 | close (fd); | |
968 | return 0; | |
969 | } | |
970 | } while (li->tv_sec == 0); | |
971 | ||
972 | return 1; | |
564dd50a | 973 | } |
1d7b9b20 | 974 | |
975 | ||
976 | #endif | |
977 | /* USE_WTMP */ | |
978 | ||
979 | ||
980 | /** | |
564dd50a | 981 | ** Low-level wtmpx functions |
1d7b9b20 | 982 | **/ |
983 | ||
984 | #ifdef USE_WTMPX | |
985 | ||
1d7b9b20 | 986 | /* write a wtmpx entry direct to the end of the file */ |
564dd50a | 987 | /* This is a slight modification of code in OpenBSD's logwtmp.c */ |
1d7b9b20 | 988 | static int |
564dd50a | 989 | wtmpx_write(struct logininfo *li, struct utmpx *utx) |
990 | { | |
1d7b9b20 | 991 | struct stat buf; |
992 | int fd, ret = 1; | |
993 | ||
994 | if ((fd = open(WTMPX_FILE, O_WRONLY|O_APPEND, 0)) < 0) { | |
995 | log("wtmpx_write: problem opening %s: %s", | |
996 | WTMPX_FILE, strerror(errno)); | |
997 | return 0; | |
998 | } | |
999 | ||
1000 | if (fstat(fd, &buf) == 0) | |
1001 | if (write(fd, (char *)utx, sizeof(struct utmpx)) != | |
1002 | sizeof(struct utmpx)) { | |
1003 | ftruncate(fd, buf.st_size); | |
1004 | log("wtmpx_write: problem writing %s: %s", | |
1005 | WTMPX_FILE, strerror(errno)); | |
1006 | ret = 0; | |
1007 | } | |
1008 | (void)close(fd); | |
1009 | ||
1010 | return ret; | |
564dd50a | 1011 | } |
1d7b9b20 | 1012 | |
1013 | ||
1014 | static int | |
564dd50a | 1015 | wtmpx_perform_login(struct logininfo *li) |
1016 | { | |
1d7b9b20 | 1017 | struct utmpx utx; |
1018 | ||
1019 | construct_utmpx(li, &utx); | |
1020 | return wtmpx_write(li, &utx); | |
564dd50a | 1021 | } |
1d7b9b20 | 1022 | |
1023 | ||
1024 | static int | |
564dd50a | 1025 | wtmpx_perform_logout(struct logininfo *li) |
1026 | { | |
1d7b9b20 | 1027 | struct utmpx utx; |
1028 | ||
1029 | construct_utmpx(li, &utx); | |
1030 | /* blank out unnecessary fields */ | |
1031 | memset(&(utx.ut_name), '\0', sizeof(utx.ut_name)); | |
1032 | #ifdef HAVE_ID_IN_UTMPX | |
1033 | memset(&(utx.ut_id), '\0', sizeof(utx.ut_id)); | |
1034 | #endif | |
1035 | #ifdef HAVE_HOST_IN_UTMPX | |
1036 | memset(&(utx.ut_host), '\0', sizeof(utx.ut_host)); | |
1037 | #endif | |
1038 | #ifdef HAVE_ADDR_IN_UTMPX | |
1039 | memset(&(utx.ut_addr), '\0', sizeof(utx.ut_addr)); | |
1040 | #endif | |
1041 | return wtmpx_write(li, &utx); | |
1042 | ||
564dd50a | 1043 | } |
1d7b9b20 | 1044 | |
1045 | ||
1046 | int | |
564dd50a | 1047 | wtmpx_write_entry(struct logininfo *li) |
1048 | { | |
1d7b9b20 | 1049 | switch(li->type) { |
1050 | case LTYPE_LOGIN: | |
1051 | return wtmpx_perform_login(li); | |
1052 | case LTYPE_LOGOUT: | |
1053 | return wtmpx_perform_logout(li); | |
1054 | default: | |
1055 | log("wtmpx_write_entry: invalid type field"); | |
1056 | return 0; | |
1057 | } | |
564dd50a | 1058 | } |
1d7b9b20 | 1059 | |
1060 | ||
1061 | int | |
564dd50a | 1062 | wtmpx_get_entry(struct logininfo *li) |
1063 | { | |
1d7b9b20 | 1064 | struct stat st; |
1065 | struct utmpx utx; | |
1066 | int fd; | |
1067 | ||
1068 | if ((fd = open(WTMPX_FILE, O_RDONLY)) < 0) { | |
1069 | log("wtmpx_get_entry: problem opening %s: %s", | |
1070 | WTMPX_FILE, strerror(errno)); | |
1071 | return 0; | |
1072 | } | |
564dd50a | 1073 | if (fstat(fd, &st) != 0) { |
1d7b9b20 | 1074 | log("wtmpx_get_entry: couldn't stat %s: %s", |
1075 | WTMP_FILE, strerror(errno)); | |
1076 | close(fd); | |
1077 | return 0; | |
1078 | } | |
1d7b9b20 | 1079 | (void)lseek(fd, (off_t)(0-sizeof(struct utmpx)), SEEK_END); |
1080 | ||
1081 | do { | |
1082 | if (read(fd, &utx, sizeof(utx)) != sizeof(utx)) { | |
1083 | log("wtmpx_get_entry: read of %s failed: %s", | |
1084 | WTMPX_FILE, strerror(errno)); | |
1085 | close (fd); | |
1086 | return 0; | |
1087 | } | |
1d7b9b20 | 1088 | /* Logouts are recorded as a blank username on a particular line. |
1089 | * So, we just need to find the username in struct utmpx */ | |
1090 | if ( strncmp(li->username, utx.ut_user, 8) == 0 ) { | |
1091 | /* note we've already made sure there's a time in struct utmp */ | |
1092 | #ifdef HAVE_TV_IN_UTMPX | |
1093 | li->tv_sec = utx.ut_tv.tv_sec; | |
1094 | #else | |
1095 | # ifdef HAVE_TIME_IN_UTMPX | |
1096 | li->tv_sec = utx.ut_time; | |
1097 | # endif | |
1098 | #endif | |
1099 | line_fullname(li->line, utx.ut_line, sizeof(utx.ut_line)); | |
1100 | #ifdef HAVE_HOST_IN_UTMPX | |
1101 | strlcpy(li->hostname, utx.ut_host, sizeof(utx.ut_line)); | |
1102 | #endif | |
1103 | } | |
1104 | if (lseek(fd, (off_t)(0-2*sizeof(struct utmpx)), SEEK_CUR) == -1) { | |
1105 | close (fd); | |
1106 | return 0; | |
1107 | } | |
1108 | } while (li->tv_sec == 0); | |
1109 | return 1; | |
564dd50a | 1110 | } |
1d7b9b20 | 1111 | |
1112 | ||
f988dce5 | 1113 | #endif /* USE_WTMPX */ |
1d7b9b20 | 1114 | |
1115 | ||
1116 | /** | |
564dd50a | 1117 | ** Low-level libutil login() functions |
1d7b9b20 | 1118 | **/ |
1119 | ||
1120 | #ifdef USE_LOGIN | |
1121 | ||
1d7b9b20 | 1122 | static int |
564dd50a | 1123 | syslogin_perform_login(struct logininfo *li) |
1124 | { | |
1d7b9b20 | 1125 | struct utmp *ut; |
1126 | ||
1127 | if (! (ut = (struct utmp *)malloc(sizeof(struct utmp)))) { | |
1128 | log("syslogin_perform_login: couldn't malloc()"); | |
1129 | return 0; | |
1130 | } | |
1131 | construct_utmp(li, ut); | |
1132 | login(ut); | |
1133 | ||
1134 | return 1; | |
564dd50a | 1135 | } |
1d7b9b20 | 1136 | |
1d7b9b20 | 1137 | |
564dd50a | 1138 | static int |
1139 | syslogin_perform_logout(struct logininfo *li) | |
1140 | { | |
1d7b9b20 | 1141 | #ifdef HAVE_LOGOUT |
1142 | char line[8]; | |
1143 | ||
1144 | (void)line_stripname(line, li->line, sizeof(line)); | |
1145 | ||
1146 | if (!logout(line)) { | |
1147 | log("syslogin_perform_logout: logout() returned an error"); | |
f988dce5 | 1148 | # ifdef HAVE_LOGWTMP |
1d7b9b20 | 1149 | } else { |
1150 | logwtmp(line, "", ""); | |
1151 | } | |
f988dce5 | 1152 | # endif |
1d7b9b20 | 1153 | /* TODO: what to do if we have login, but no logout? |
1154 | * what if logout but no logwtmp? All routines are in libutil | |
1155 | * so they should all be there, but... */ | |
1156 | #endif | |
1157 | return 1; | |
564dd50a | 1158 | } |
1d7b9b20 | 1159 | |
1160 | ||
1161 | int | |
564dd50a | 1162 | syslogin_write_entry(struct logininfo *li) |
1163 | { | |
1d7b9b20 | 1164 | switch (li->type) { |
1165 | case LTYPE_LOGIN: | |
1166 | return syslogin_perform_login(li); | |
1167 | case LTYPE_LOGOUT: | |
1168 | return syslogin_perform_logout(li); | |
1169 | default: | |
1170 | log("syslogin_write_entry: Invalid type field"); | |
1171 | return 0; | |
1172 | } | |
564dd50a | 1173 | } |
1d7b9b20 | 1174 | |
1175 | ||
f988dce5 | 1176 | #endif /* USE_LOGIN */ |
1d7b9b20 | 1177 | |
1178 | /* end of file log-syslogin.c */ | |
1179 | ||
1180 | ||
1181 | /** | |
564dd50a | 1182 | ** Low-level lastlog functions |
1d7b9b20 | 1183 | **/ |
1184 | ||
1185 | #ifdef USE_LASTLOG | |
1186 | ||
1d7b9b20 | 1187 | static void |
564dd50a | 1188 | lastlog_construct(struct logininfo *li, struct lastlog *last) |
1189 | { | |
1d7b9b20 | 1190 | /* clear the structure */ |
1191 | memset(last, '\0', sizeof(struct lastlog)); | |
1192 | ||
1193 | (void)line_stripname(last->ll_line, li->line, | |
1194 | sizeof(last->ll_line)); | |
1195 | strlcpy(last->ll_host, li->hostname, sizeof(last->ll_host)); | |
1196 | last->ll_time = li->tv_sec; | |
564dd50a | 1197 | } |
1d7b9b20 | 1198 | |
1199 | ||
1200 | #define LL_FILE 1 | |
1201 | #define LL_DIR 2 | |
1202 | #define LL_OTHER 3 | |
1203 | ||
1204 | static int | |
564dd50a | 1205 | lastlog_filetype(char *filename) |
1206 | { | |
1d7b9b20 | 1207 | struct stat st; |
1208 | ||
1209 | if ( stat(LASTLOG_FILE, &st) != 0) { | |
1210 | log("lastlog_perform_login: Couldn't stat %s: %s", | |
1211 | LASTLOG_FILE, strerror(errno)); | |
1212 | return 0; | |
1213 | } | |
1d7b9b20 | 1214 | if (S_ISDIR(st.st_mode)) |
1215 | return LL_DIR; | |
1216 | else if (S_ISREG(st.st_mode)) | |
1217 | return LL_FILE; | |
1218 | else | |
1219 | return LL_OTHER; | |
564dd50a | 1220 | } |
1d7b9b20 | 1221 | |
1222 | ||
1223 | /* open the file (using filemode) and seek to the login entry */ | |
1224 | static int | |
564dd50a | 1225 | lastlog_openseek(struct logininfo *li, int *fd, int filemode) |
1226 | { | |
1d7b9b20 | 1227 | off_t offset; |
1228 | int type; | |
1229 | char lastlog_file[1024]; | |
1230 | ||
1231 | type = lastlog_filetype(LASTLOG_FILE); | |
1232 | switch (type) { | |
1233 | case LL_FILE: | |
1234 | strlcpy(lastlog_file, LASTLOG_FILE, sizeof(lastlog_file)); | |
1235 | break; | |
1236 | case LL_DIR: | |
1237 | snprintf(lastlog_file, sizeof(lastlog_file), "%s/%s", | |
1238 | LASTLOG_FILE, li->username); | |
1239 | break; | |
1240 | default: | |
1241 | log("lastlog_openseek: %.100s is not a file or directory!", | |
1242 | LASTLOG_FILE); | |
1243 | return 0; | |
1244 | } /* switch */ | |
1245 | ||
1246 | *fd = open(lastlog_file, filemode); | |
1247 | if ( *fd < 0) { | |
1248 | log("lastlog_openseek: Couldn't open %s: %s", | |
1249 | lastlog_file, strerror(errno)); | |
1250 | return 0; | |
1251 | } | |
1d7b9b20 | 1252 | /* find this uid's offset in the lastlog file */ |
1253 | offset = (off_t) ( (long)li->uid * sizeof(struct lastlog)); | |
1254 | ||
1255 | if ( lseek(*fd, offset, SEEK_SET) != offset ) { | |
1256 | log("lastlog_openseek: %s->lseek(): %s", | |
1257 | lastlog_file, strerror(errno)); | |
1258 | return 0; | |
1259 | } | |
1260 | return 1; | |
564dd50a | 1261 | } |
1d7b9b20 | 1262 | |
1263 | static int | |
564dd50a | 1264 | lastlog_perform_login(struct logininfo *li) |
1265 | { | |
1d7b9b20 | 1266 | struct lastlog last; |
1267 | int fd; | |
1268 | ||
1269 | /* create our struct lastlog */ | |
1270 | lastlog_construct(li, &last); | |
1271 | ||
1272 | /* write the entry */ | |
1273 | if (lastlog_openseek(li, &fd, O_RDWR)) { | |
1274 | if ( write(fd, &last, sizeof(struct lastlog)) | |
1275 | != sizeof(struct lastlog) ) { | |
1276 | log("lastlog_write_filemode: Error writing to %s: %s", | |
1277 | LASTLOG_FILE, strerror(errno)); | |
1278 | return 0; | |
1279 | } | |
1280 | return 1; | |
1281 | } else | |
1282 | return 0; | |
564dd50a | 1283 | } |
1d7b9b20 | 1284 | |
1285 | ||
1286 | int | |
564dd50a | 1287 | lastlog_write_entry(struct logininfo *li) |
1288 | { | |
1d7b9b20 | 1289 | switch(li->type) { |
1290 | case LTYPE_LOGIN: | |
1291 | return lastlog_perform_login(li); | |
1292 | default: | |
1293 | log("lastlog_write_entry: Invalid type field"); | |
1294 | return 0; | |
1295 | } | |
564dd50a | 1296 | } |
1d7b9b20 | 1297 | |
1298 | ||
1299 | static void | |
564dd50a | 1300 | lastlog_populate_entry(struct logininfo *li, struct lastlog *last) |
1301 | { | |
1d7b9b20 | 1302 | line_fullname(li->line, last->ll_line, sizeof(li->line)); |
1303 | strlcpy(li->hostname, last->ll_host, sizeof(li->hostname)); | |
1304 | li->tv_sec = last->ll_time; | |
564dd50a | 1305 | } |
1d7b9b20 | 1306 | |
1307 | ||
1308 | int | |
564dd50a | 1309 | lastlog_get_entry(struct logininfo *li) |
1310 | { | |
1d7b9b20 | 1311 | struct lastlog last; |
1312 | int fd; | |
1313 | ||
1314 | if (lastlog_openseek(li, &fd, O_RDONLY)) { | |
1315 | if ( read(fd, &last, sizeof(struct lastlog)) | |
1316 | != sizeof(struct lastlog) ) { | |
1317 | log("lastlog_write_filemode: Error reading from %s: %s", | |
1318 | LASTLOG_FILE, strerror(errno)); | |
1319 | return 0; | |
1320 | } else { | |
1321 | lastlog_populate_entry(li, &last); | |
1322 | return 1; | |
1323 | } | |
1d7b9b20 | 1324 | } else |
1325 | return 0; | |
564dd50a | 1326 | } |
1d7b9b20 | 1327 | |
1328 | ||
f988dce5 | 1329 | #endif /* USE_LASTLOG */ |