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6dbe3af9 KZ |
1 | /* |
2 | * Berkeley last for Linux. Currently maintained by poe@daimi.aau.dk at | |
3 | * ftp://ftp.daimi.aau.dk/pub/linux/poe/admutil* | |
4 | * | |
5 | * Copyright (c) 1987 Regents of the University of California. | |
6 | * All rights reserved. | |
7 | * | |
8 | * Redistribution and use in source and binary forms are permitted | |
9 | * provided that the above copyright notice and this paragraph are | |
10 | * duplicated in all such forms and that any documentation, | |
11 | * advertising materials, and other materials related to such | |
12 | * distribution and use acknowledge that the software was developed | |
13 | * by the University of California, Berkeley. The name of the | |
14 | * University may not be used to endorse or promote products derived | |
15 | * from this software without specific prior written permission. | |
16 | * THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR | |
17 | * IMPLIED WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED | |
18 | * WARRANTIES OF MERCHANTIBILITY AND FITNESS FOR A PARTICULAR PURPOSE. | |
19 | */ | |
20 | ||
21 | #ifndef lint | |
22 | char copyright[] = | |
23 | "@(#) Copyright (c) 1987 Regents of the University of California.\n\ | |
24 | All rights reserved.\n"; | |
25 | #endif /* not lint */ | |
26 | ||
27 | #ifndef lint | |
28 | static char sccsid[] = "@(#)last.c 5.11 (Berkeley) 6/29/88"; | |
29 | #endif /* not lint */ | |
30 | ||
31 | /* | |
32 | * last | |
33 | */ | |
34 | #include <sys/param.h> | |
35 | #include <sys/stat.h> | |
36 | #include <sys/file.h> | |
37 | #include <signal.h> | |
38 | #include <string.h> | |
39 | #include <time.h> | |
40 | #include <utmp.h> | |
41 | #include <stdio.h> | |
42 | #include <getopt.h> | |
43 | #include <stdlib.h> | |
44 | #include <unistd.h> | |
45 | #include <arpa/inet.h> | |
46 | #include "pathnames.h" | |
47 | ||
48 | #define SECDAY (24*60*60) /* seconds in a day */ | |
49 | #define NO 0 /* false/no */ | |
50 | #define YES 1 /* true/yes */ | |
51 | ||
52 | static struct utmp buf[1024]; /* utmp read buffer */ | |
53 | ||
54 | #define HMAX (int)sizeof(buf[0].ut_host) /* size of utmp host field */ | |
55 | #define LMAX (int)sizeof(buf[0].ut_line) /* size of utmp tty field */ | |
56 | #define NMAX (int)sizeof(buf[0].ut_name) /* size of utmp name field */ | |
57 | ||
58 | typedef struct arg { | |
59 | char *name; /* argument */ | |
60 | #define HOST_TYPE -2 | |
61 | #define TTY_TYPE -3 | |
62 | #define USER_TYPE -4 | |
63 | #define INET_TYPE -5 | |
64 | int type; /* type of arg */ | |
65 | struct arg *next; /* linked list pointer */ | |
66 | } ARG; | |
67 | ARG *arglist; /* head of linked list */ | |
68 | ||
69 | typedef struct ttytab { | |
70 | long logout; /* log out time */ | |
71 | char tty[LMAX + 1]; /* terminal name */ | |
72 | struct ttytab *next; /* linked list pointer */ | |
73 | } TTY; | |
74 | TTY *ttylist; /* head of linked list */ | |
75 | ||
76 | static long currentout, /* current logout value */ | |
77 | maxrec; /* records to display */ | |
78 | static char *file = _PATH_WTMP; /* wtmp file */ | |
79 | ||
80 | static int doyear = 0; /* output year in dates */ | |
81 | static int dolong = 0; /* print also ip-addr */ | |
82 | ||
83 | static void wtmp(), addarg(), hostconv(); | |
84 | static int want(); | |
85 | TTY *addtty(); | |
86 | static char *ttyconv(); | |
87 | ||
88 | int | |
89 | main(argc, argv) | |
90 | int argc; | |
91 | char **argv; | |
92 | { | |
93 | extern int optind; | |
94 | extern char *optarg; | |
95 | int ch; | |
96 | ||
97 | while ((ch = getopt(argc, argv, "0123456789yli:f:h:t:")) != EOF) | |
98 | switch((char)ch) { | |
99 | case '0': case '1': case '2': case '3': case '4': | |
100 | case '5': case '6': case '7': case '8': case '9': | |
101 | /* | |
102 | * kludge: last was originally designed to take | |
103 | * a number after a dash. | |
104 | */ | |
105 | if (!maxrec) | |
106 | maxrec = atol(argv[optind - 1] + 1); | |
107 | break; | |
108 | case 'f': | |
109 | file = optarg; | |
110 | break; | |
111 | case 'h': | |
112 | hostconv(optarg); | |
113 | addarg(HOST_TYPE, optarg); | |
114 | break; | |
115 | case 't': | |
116 | addarg(TTY_TYPE, ttyconv(optarg)); | |
117 | break; | |
118 | case 'y': | |
119 | doyear = 1; | |
120 | break; | |
121 | case 'l': | |
122 | dolong = 1; | |
123 | break; | |
124 | case 'i': | |
125 | addarg(INET_TYPE, optarg); | |
126 | break; | |
127 | case '?': | |
128 | default: | |
129 | fputs("usage: last [-#] [-f file] [-t tty] [-h hostname] [user ...]\n", stderr); | |
130 | exit(1); | |
131 | } | |
132 | for (argv += optind; *argv; ++argv) { | |
133 | #define COMPATIBILITY | |
134 | #ifdef COMPATIBILITY | |
135 | /* code to allow "last p5" to work */ | |
136 | addarg(TTY_TYPE, ttyconv(*argv)); | |
137 | #endif | |
138 | addarg(USER_TYPE, *argv); | |
139 | } | |
140 | wtmp(); | |
141 | exit(0); | |
142 | } | |
143 | ||
144 | /* | |
145 | * print_partial_line -- | |
146 | * print the first part of each output line according to specified format | |
147 | */ | |
148 | void | |
149 | print_partial_line(bp) | |
150 | struct utmp *bp; | |
151 | { | |
152 | char *ct; | |
153 | ||
154 | ct = ctime(&bp->ut_time); | |
155 | printf("%-*.*s %-*.*s ", NMAX, NMAX, bp->ut_name, | |
156 | LMAX, LMAX, bp->ut_line); | |
157 | ||
158 | if (dolong) { | |
159 | if (bp->ut_addr) { | |
160 | struct in_addr foo; | |
161 | foo.s_addr = bp->ut_addr; | |
162 | printf("%-*.*s ", HMAX, HMAX, inet_ntoa(foo)); | |
163 | } else { | |
164 | printf("%-*.*s ", HMAX, HMAX, ""); | |
165 | } | |
166 | } else { | |
167 | printf("%-*.*s ", HMAX, HMAX, bp->ut_host); | |
168 | } | |
169 | ||
170 | if (doyear) { | |
171 | printf("%10.10s %4.4s %5.5s ", ct, ct + 20, ct + 11); | |
172 | } else { | |
173 | printf("%10.10s %5.5s ", ct, ct + 11); | |
174 | } | |
175 | } | |
176 | ||
177 | /* | |
178 | * wtmp -- | |
179 | * read through the wtmp file | |
180 | */ | |
181 | static void | |
182 | wtmp() | |
183 | { | |
184 | register struct utmp *bp; /* current structure */ | |
185 | register TTY *T; /* tty list entry */ | |
186 | struct stat stb; /* stat of file for size */ | |
187 | long bl, delta, /* time difference */ | |
188 | lseek(), time(); | |
189 | int bytes, wfd; | |
190 | void onintr(); | |
191 | char *ct, *crmsg; | |
192 | ||
193 | if ((wfd = open(file, O_RDONLY, 0)) < 0 || fstat(wfd, &stb) == -1) { | |
194 | perror(file); | |
195 | exit(1); | |
196 | } | |
197 | bl = (stb.st_size + sizeof(buf) - 1) / sizeof(buf); | |
198 | ||
199 | (void)time(&buf[0].ut_time); | |
200 | (void)signal(SIGINT, onintr); | |
201 | (void)signal(SIGQUIT, onintr); | |
202 | ||
203 | while (--bl >= 0) { | |
fd6b7a7f KZ |
204 | if (lseek(wfd, (long)(bl * sizeof(buf)), L_SET) == -1 || |
205 | (bytes = read(wfd, (char *)buf, sizeof(buf))) == -1) { | |
206 | fprintf(stderr, "last: %s: ", file); | |
207 | perror((char *)NULL); | |
208 | exit(1); | |
209 | } | |
210 | for (bp = &buf[bytes / sizeof(buf[0]) - 1]; bp >= buf; --bp) { | |
211 | /* | |
212 | * if the terminal line is '~', the machine stopped. | |
213 | * see utmp(5) for more info. | |
214 | */ | |
215 | if (!strncmp(bp->ut_line, "~", LMAX)) { | |
216 | /* | |
217 | * utmp(5) also mentions that the user | |
218 | * name should be 'shutdown' or 'reboot'. | |
219 | * Not checking the name causes i.e. runlevel | |
220 | * changes to be displayed as 'crash'. -thaele | |
221 | */ | |
222 | if (!strncmp(bp->ut_user, "reboot", NMAX) || | |
223 | !strncmp(bp->ut_user, "shutdown", NMAX)) { | |
224 | /* everybody just logged out */ | |
225 | for (T = ttylist; T; T = T->next) | |
226 | T->logout = -bp->ut_time; | |
227 | } | |
228 | ||
229 | currentout = -bp->ut_time; | |
230 | crmsg = strncmp(bp->ut_name, "shutdown", NMAX) ? "crash" : "down "; | |
231 | if (!bp->ut_name[0]) | |
232 | (void)strcpy(bp->ut_name, "reboot"); | |
233 | if (want(bp, NO)) { | |
234 | ct = ctime(&bp->ut_time); | |
235 | if(bp->ut_type != LOGIN_PROCESS) { | |
236 | print_partial_line(bp); | |
237 | putchar('\n'); | |
6dbe3af9 | 238 | } |
fd6b7a7f KZ |
239 | if (maxrec && !--maxrec) |
240 | return; | |
241 | } | |
242 | continue; | |
243 | } | |
244 | /* find associated tty */ | |
245 | for (T = ttylist;; T = T->next) { | |
246 | if (!T) { | |
247 | /* add new one */ | |
248 | T = addtty(bp->ut_line); | |
249 | break; | |
250 | } | |
251 | if (!strncmp(T->tty, bp->ut_line, LMAX)) | |
252 | break; | |
253 | } | |
254 | if (bp->ut_name[0] && bp->ut_type != LOGIN_PROCESS | |
255 | && bp->ut_type != DEAD_PROCESS | |
256 | && want(bp, YES)) { | |
6dbe3af9 | 257 | |
fd6b7a7f | 258 | print_partial_line(bp); |
6dbe3af9 | 259 | |
fd6b7a7f KZ |
260 | if (!T->logout) |
261 | puts(" still logged in"); | |
262 | else { | |
263 | if (T->logout < 0) { | |
264 | T->logout = -T->logout; | |
265 | printf("- %s", crmsg); | |
6dbe3af9 | 266 | } |
fd6b7a7f KZ |
267 | else |
268 | printf("- %5.5s", ctime(&T->logout)+11); | |
269 | delta = T->logout - bp->ut_time; | |
270 | if (delta < SECDAY) | |
271 | printf(" (%5.5s)\n", asctime(gmtime(&delta))+11); | |
272 | else | |
273 | printf(" (%ld+%5.5s)\n", delta / SECDAY, asctime(gmtime(&delta))+11); | |
274 | } | |
275 | if (maxrec != -1 && !--maxrec) | |
276 | return; | |
6dbe3af9 | 277 | } |
fd6b7a7f KZ |
278 | T->logout = bp->ut_time; |
279 | } | |
6dbe3af9 KZ |
280 | } |
281 | ct = ctime(&buf[0].ut_time); | |
282 | printf("\nwtmp begins %10.10s %5.5s \n", ct, ct + 11); | |
283 | } | |
284 | ||
285 | /* | |
286 | * want -- | |
287 | * see if want this entry | |
288 | */ | |
289 | static int | |
290 | want(bp, check) | |
291 | register struct utmp *bp; | |
292 | int check; | |
293 | { | |
294 | register ARG *step; | |
295 | ||
296 | if (check) | |
297 | /* | |
298 | * when uucp and ftp log in over a network, the entry in | |
299 | * the utmp file is the name plus their process id. See | |
300 | * etc/ftpd.c and usr.bin/uucp/uucpd.c for more information. | |
301 | */ | |
302 | if (!strncmp(bp->ut_line, "ftp", sizeof("ftp") - 1)) | |
303 | bp->ut_line[3] = '\0'; | |
304 | else if (!strncmp(bp->ut_line, "uucp", sizeof("uucp") - 1)) | |
305 | bp->ut_line[4] = '\0'; | |
306 | if (!arglist) | |
307 | return(YES); | |
308 | ||
309 | for (step = arglist; step; step = step->next) | |
310 | switch(step->type) { | |
311 | case HOST_TYPE: | |
312 | if (!strncmp(step->name, bp->ut_host, HMAX)) | |
313 | return(YES); | |
314 | break; | |
315 | case TTY_TYPE: | |
316 | if (!strncmp(step->name, bp->ut_line, LMAX)) | |
317 | return(YES); | |
318 | break; | |
319 | case USER_TYPE: | |
320 | if (!strncmp(step->name, bp->ut_name, NMAX)) | |
321 | return(YES); | |
322 | break; | |
323 | case INET_TYPE: | |
324 | if (bp->ut_addr == inet_addr(step->name)) | |
325 | return(YES); | |
326 | break; | |
327 | } | |
328 | return(NO); | |
329 | } | |
330 | ||
331 | /* | |
332 | * addarg -- | |
333 | * add an entry to a linked list of arguments | |
334 | */ | |
335 | static void | |
336 | addarg(type, arg) | |
337 | int type; | |
338 | char *arg; | |
339 | { | |
340 | register ARG *cur; | |
341 | ||
342 | if (!(cur = (ARG *)malloc((unsigned int)sizeof(ARG)))) { | |
343 | fputs("last: malloc failure.\n", stderr); | |
344 | exit(1); | |
345 | } | |
346 | cur->next = arglist; | |
347 | cur->type = type; | |
348 | cur->name = arg; | |
349 | arglist = cur; | |
350 | } | |
351 | ||
352 | /* | |
353 | * addtty -- | |
354 | * add an entry to a linked list of ttys | |
355 | */ | |
356 | TTY * | |
357 | addtty(ttyname) | |
358 | char *ttyname; | |
359 | { | |
360 | register TTY *cur; | |
361 | ||
362 | if (!(cur = (TTY *)malloc((unsigned int)sizeof(TTY)))) { | |
363 | fputs("last: malloc failure.\n", stderr); | |
364 | exit(1); | |
365 | } | |
366 | cur->next = ttylist; | |
367 | cur->logout = currentout; | |
368 | memcpy(cur->tty, ttyname, LMAX); | |
369 | return(ttylist = cur); | |
370 | } | |
371 | ||
372 | /* | |
373 | * hostconv -- | |
374 | * convert the hostname to search pattern; if the supplied host name | |
375 | * has a domain attached that is the same as the current domain, rip | |
376 | * off the domain suffix since that's what login(1) does. | |
377 | */ | |
378 | static void | |
379 | hostconv(arg) | |
380 | char *arg; | |
381 | { | |
382 | static int first = 1; | |
383 | static char *hostdot, | |
384 | name[MAXHOSTNAMELEN]; | |
385 | char *argdot; | |
386 | ||
387 | if (!(argdot = strchr(arg, '.'))) | |
388 | return; | |
389 | if (first) { | |
390 | first = 0; | |
391 | if (gethostname(name, sizeof(name))) { | |
392 | perror("last: gethostname"); | |
393 | exit(1); | |
394 | } | |
395 | hostdot = strchr(name, '.'); | |
396 | } | |
397 | if (hostdot && !strcmp(hostdot, argdot)) | |
398 | *argdot = '\0'; | |
399 | } | |
400 | ||
401 | /* | |
402 | * ttyconv -- | |
403 | * convert tty to correct name. | |
404 | */ | |
405 | static char * | |
406 | ttyconv(arg) | |
407 | char *arg; | |
408 | { | |
409 | char *mval; | |
410 | ||
411 | /* | |
412 | * kludge -- we assume that all tty's end with | |
413 | * a two character suffix. | |
414 | */ | |
415 | if (strlen(arg) == 2) { | |
416 | /* either 6 for "ttyxx" or 8 for "console" */ | |
417 | if (!(mval = malloc((unsigned int)8))) { | |
418 | fputs("last: malloc failure.\n", stderr); | |
419 | exit(1); | |
420 | } | |
421 | if (!strcmp(arg, "co")) | |
422 | (void)strcpy(mval, "console"); | |
423 | else { | |
424 | (void)strcpy(mval, "tty"); | |
425 | (void)strcpy(mval + 3, arg); | |
426 | } | |
427 | return(mval); | |
428 | } | |
429 | if (!strncmp(arg, "/dev/", sizeof("/dev/") - 1)) | |
430 | return(arg + 5); | |
431 | return(arg); | |
432 | } | |
433 | ||
434 | /* | |
435 | * onintr -- | |
436 | * on interrupt, we inform the user how far we've gotten | |
437 | */ | |
438 | void | |
439 | onintr(signo) | |
440 | int signo; | |
441 | { | |
442 | char *ct; | |
443 | ||
444 | ct = ctime(&buf[0].ut_time); | |
445 | printf("\ninterrupted %10.10s %5.5s \n", ct, ct + 11); | |
446 | if (signo == SIGINT) | |
447 | exit(1); | |
448 | (void)fflush(stdout); /* fix required for rsh */ | |
449 | } |