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22e155fc | 1 | /* |
aac55542 KB |
2 | * Copyright (c) 1987 Regents of the University of California. |
3 | * All rights reserved. | |
4 | * | |
5 | * Redistribution and use in source and binary forms are permitted | |
5e8b0e60 KB |
6 | * provided that the above copyright notice and this paragraph are |
7 | * duplicated in all such forms and that any documentation, | |
8 | * advertising materials, and other materials related to such | |
9 | * distribution and use acknowledge that the software was developed | |
10 | * by the University of California, Berkeley. The name of the | |
11 | * University may not be used to endorse or promote products derived | |
12 | * from this software without specific prior written permission. | |
13 | * THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR | |
14 | * IMPLIED WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED | |
15 | * WARRANTIES OF MERCHANTIBILITY AND FITNESS FOR A PARTICULAR PURPOSE. | |
22e155fc DF |
16 | */ |
17 | ||
18 | #ifndef lint | |
19 | char copyright[] = | |
aac55542 | 20 | "@(#) Copyright (c) 1987 Regents of the University of California.\n\ |
22e155fc | 21 | All rights reserved.\n"; |
aac55542 | 22 | #endif /* not lint */ |
22e155fc | 23 | |
37c640e2 | 24 | #ifndef lint |
5e8b0e60 | 25 | static char sccsid[] = "@(#)last.c 5.11 (Berkeley) %G%"; |
aac55542 | 26 | #endif /* not lint */ |
37c640e2 | 27 | |
c9af8668 BJ |
28 | /* |
29 | * last | |
30 | */ | |
53f69172 | 31 | #include <sys/param.h> |
40d69e19 | 32 | #include <sys/stat.h> |
0e3f8c72 KB |
33 | #include <sys/file.h> |
34 | #include <signal.h> | |
35 | #include <time.h> | |
c9af8668 | 36 | #include <utmp.h> |
0e3f8c72 | 37 | #include <stdio.h> |
c9af8668 | 38 | |
53f69172 KB |
39 | #define SECDAY (24*60*60) /* seconds in a day */ |
40 | #define NO 0 /* false/no */ | |
41 | #define YES 1 /* true/yes */ | |
c9af8668 | 42 | |
53f69172 | 43 | static struct utmp buf[1024]; /* utmp read buffer */ |
c9af8668 | 44 | |
53f69172 KB |
45 | #define HMAX sizeof(buf[0].ut_host) /* size of utmp host field */ |
46 | #define LMAX sizeof(buf[0].ut_line) /* size of utmp tty field */ | |
47 | #define NMAX sizeof(buf[0].ut_name) /* size of utmp name field */ | |
48 | ||
49 | typedef struct arg { | |
50 | char *name; /* argument */ | |
51 | #define HOST_TYPE -2 | |
52 | #define TTY_TYPE -3 | |
53 | #define USER_TYPE -4 | |
54 | int type; /* type of arg */ | |
55 | struct arg *next; /* linked list pointer */ | |
56 | } ARG; | |
f322a08e | 57 | ARG *arglist; /* head of linked list */ |
c9af8668 | 58 | |
0e3f8c72 KB |
59 | typedef struct ttytab { |
60 | long logout; /* log out time */ | |
61 | char tty[LMAX + 1]; /* terminal name */ | |
f322a08e KB |
62 | struct ttytab *next; /* linked list pointer */ |
63 | } TTY; | |
64 | TTY *ttylist; /* head of linked list */ | |
c9af8668 | 65 | |
f322a08e KB |
66 | static long currentout, /* current logout value */ |
67 | maxrec; /* records to display */ | |
53f69172 KB |
68 | static char *file = "/usr/adm/wtmp"; /* wtmp file */ |
69 | ||
70 | main(argc, argv) | |
71 | int argc; | |
72 | char **argv; | |
73 | { | |
74 | extern int optind; | |
75 | extern char *optarg; | |
76 | int ch; | |
53f69172 | 77 | long atol(); |
f322a08e | 78 | char *ttyconv(); |
53f69172 KB |
79 | |
80 | while ((ch = getopt(argc, argv, "0123456789f:h:t:")) != EOF) | |
81 | switch((char)ch) { | |
82 | case '0': case '1': case '2': case '3': case '4': | |
83 | case '5': case '6': case '7': case '8': case '9': | |
84 | /* | |
85 | * kludge: last was originally designed to take | |
86 | * a number after a dash. | |
87 | */ | |
88 | if (!maxrec) | |
89 | maxrec = atol(argv[optind - 1] + 1); | |
90 | break; | |
91 | case 'f': | |
92 | file = optarg; | |
93 | break; | |
94 | case 'h': | |
95 | hostconv(optarg); | |
96 | addarg(HOST_TYPE, optarg); | |
97 | break; | |
98 | case 't': | |
f322a08e | 99 | addarg(TTY_TYPE, ttyconv(optarg)); |
53f69172 | 100 | break; |
53f69172 KB |
101 | case '?': |
102 | default: | |
103 | fputs("usage: last [-#] [-f file] [-t tty] [-h hostname] [user ...]\n", stderr); | |
104 | exit(1); | |
105 | } | |
f322a08e KB |
106 | for (argv += optind; *argv; ++argv) { |
107 | #define COMPATIBILITY | |
108 | #ifdef COMPATIBILITY | |
109 | /* code to allow "last p5" to work */ | |
110 | addarg(TTY_TYPE, ttyconv(*argv)); | |
111 | #endif | |
53f69172 | 112 | addarg(USER_TYPE, *argv); |
f322a08e | 113 | } |
53f69172 KB |
114 | wtmp(); |
115 | exit(0); | |
116 | } | |
c9af8668 | 117 | |
53f69172 KB |
118 | /* |
119 | * wtmp -- | |
120 | * read through the wtmp file | |
121 | */ | |
122 | static | |
123 | wtmp() | |
c9af8668 | 124 | { |
0e3f8c72 | 125 | register struct utmp *bp; /* current structure */ |
f322a08e | 126 | register TTY *T; /* tty list entry */ |
0e3f8c72 | 127 | struct stat stb; /* stat of file for size */ |
53f69172 KB |
128 | long bl, delta, /* time difference */ |
129 | lseek(), time(); | |
130 | int bytes, wfd, | |
0e3f8c72 | 131 | onintr(); |
53f69172 KB |
132 | char *ct, *crmsg, |
133 | *asctime(), *ctime(), *strcpy(); | |
f322a08e | 134 | TTY *addtty(); |
0e3f8c72 | 135 | |
53f69172 | 136 | if ((wfd = open(file, O_RDONLY, 0)) < 0 || fstat(wfd, &stb) == -1) { |
0e3f8c72 | 137 | perror(file); |
c9af8668 BJ |
138 | exit(1); |
139 | } | |
0e3f8c72 KB |
140 | bl = (stb.st_size + sizeof(buf) - 1) / sizeof(buf); |
141 | ||
53f69172 KB |
142 | (void)time(&buf[0].ut_time); |
143 | (void)signal(SIGINT, onintr); | |
144 | (void)signal(SIGQUIT, onintr); | |
0e3f8c72 | 145 | |
0e3f8c72 | 146 | while (--bl >= 0) { |
53f69172 KB |
147 | if (lseek(wfd, (long)(bl * sizeof(buf)), L_SET) == -1 || |
148 | (bytes = read(wfd, (char *)buf, sizeof(buf))) == -1) { | |
149 | fprintf(stderr, "last: %s: ", file); | |
150 | perror((char *)NULL); | |
0e3f8c72 KB |
151 | exit(1); |
152 | } | |
53f69172 KB |
153 | for (bp = &buf[bytes / sizeof(buf[0]) - 1]; bp >= buf; --bp) { |
154 | /* | |
155 | * if the terminal line is '~', the machine stopped. | |
156 | * see utmp(5) for more info. | |
157 | */ | |
158 | if (!strncmp(bp->ut_line, "~", LMAX)) { | |
f322a08e KB |
159 | /* everybody just logged out */ |
160 | for (T = ttylist; T; T = T->next) | |
0e3f8c72 | 161 | T->logout = -bp->ut_time; |
f322a08e KB |
162 | currentout = -bp->ut_time; |
163 | crmsg = strncmp(bp->ut_name, "shutdown", NMAX) ? "crash" : "down "; | |
0e3f8c72 | 164 | if (!bp->ut_name[0]) |
53f69172 KB |
165 | (void)strcpy(bp->ut_name, "reboot"); |
166 | if (want(bp, NO)) { | |
0e3f8c72 | 167 | ct = ctime(&bp->ut_time); |
53f69172 KB |
168 | printf("%-*.*s %-*.*s %-*.*s %10.10s %5.5s \n", NMAX, NMAX, bp->ut_name, LMAX, LMAX, bp->ut_line, HMAX, HMAX, bp->ut_host, ct, ct + 11); |
169 | if (maxrec && !--maxrec) | |
170 | return; | |
0e3f8c72 KB |
171 | } |
172 | continue; | |
c9af8668 | 173 | } |
f322a08e KB |
174 | /* find associated tty */ |
175 | for (T = ttylist;; T = T->next) { | |
176 | if (!T) { | |
177 | /* add new one */ | |
178 | T = addtty(bp->ut_line); | |
c9af8668 BJ |
179 | break; |
180 | } | |
53f69172 | 181 | if (!strncmp(T->tty, bp->ut_line, LMAX)) |
c9af8668 | 182 | break; |
c9af8668 | 183 | } |
53f69172 | 184 | if (bp->ut_name[0] && want(bp, YES)) { |
0e3f8c72 | 185 | ct = ctime(&bp->ut_time); |
53f69172 | 186 | printf("%-*.*s %-*.*s %-*.*s %10.10s %5.5s ", NMAX, NMAX, bp->ut_name, LMAX, LMAX, bp->ut_line, HMAX, HMAX, bp->ut_host, ct, ct + 11); |
0e3f8c72 KB |
187 | if (!T->logout) |
188 | puts(" still logged in"); | |
c9af8668 | 189 | else { |
0e3f8c72 KB |
190 | if (T->logout < 0) { |
191 | T->logout = -T->logout; | |
53f69172 | 192 | printf("- %s", crmsg); |
0e3f8c72 KB |
193 | } |
194 | else | |
53f69172 | 195 | printf("- %5.5s", ctime(&T->logout)+11); |
0e3f8c72 | 196 | delta = T->logout - bp->ut_time; |
c9af8668 | 197 | if (delta < SECDAY) |
53f69172 | 198 | printf(" (%5.5s)\n", asctime(gmtime(&delta))+11); |
c9af8668 | 199 | else |
53f69172 | 200 | printf(" (%ld+%5.5s)\n", delta / SECDAY, asctime(gmtime(&delta))+11); |
c9af8668 | 201 | } |
0e3f8c72 | 202 | if (maxrec != -1 && !--maxrec) |
53f69172 | 203 | return; |
c9af8668 | 204 | } |
0e3f8c72 | 205 | T->logout = bp->ut_time; |
c9af8668 BJ |
206 | } |
207 | } | |
208 | ct = ctime(&buf[0].ut_time); | |
53f69172 | 209 | printf("\nwtmp begins %10.10s %5.5s \n", ct, ct + 11); |
c9af8668 BJ |
210 | } |
211 | ||
53f69172 KB |
212 | /* |
213 | * want -- | |
214 | * see if want this entry | |
215 | */ | |
216 | static | |
217 | want(bp, check) | |
218 | register struct utmp *bp; | |
219 | int check; | |
c9af8668 | 220 | { |
53f69172 | 221 | register ARG *step; |
0e3f8c72 | 222 | |
ed99b1a7 | 223 | if (check) |
0e3f8c72 | 224 | /* |
f322a08e KB |
225 | * when uucp and ftp log in over a network, the entry in |
226 | * the utmp file is the name plus their process id. See | |
227 | * etc/ftpd.c and usr.bin/uucp/uucpd.c for more information. | |
0e3f8c72 | 228 | */ |
f322a08e | 229 | if (!strncmp(bp->ut_line, "ftp", sizeof("ftp") - 1)) |
0e3f8c72 | 230 | bp->ut_line[3] = '\0'; |
f322a08e | 231 | else if (!strncmp(bp->ut_line, "uucp", sizeof("uucp") - 1)) |
0e3f8c72 | 232 | bp->ut_line[4] = '\0'; |
f322a08e | 233 | if (!arglist) |
0e3f8c72 | 234 | return(YES); |
53f69172 | 235 | |
f322a08e | 236 | for (step = arglist; step; step = step->next) |
53f69172 KB |
237 | switch(step->type) { |
238 | case HOST_TYPE: | |
239 | if (!strncasecmp(step->name, bp->ut_host, HMAX)) | |
240 | return(YES); | |
241 | break; | |
242 | case TTY_TYPE: | |
243 | if (!strncmp(step->name, bp->ut_line, LMAX)) | |
244 | return(YES); | |
245 | break; | |
246 | case USER_TYPE: | |
247 | if (!strncmp(step->name, bp->ut_name, NMAX)) | |
248 | return(YES); | |
249 | break; | |
ed99b1a7 | 250 | } |
0e3f8c72 | 251 | return(NO); |
c9af8668 BJ |
252 | } |
253 | ||
53f69172 KB |
254 | /* |
255 | * addarg -- | |
256 | * add an entry to a linked list of arguments | |
257 | */ | |
258 | static | |
259 | addarg(type, arg) | |
260 | int type; | |
261 | char *arg; | |
c9af8668 | 262 | { |
53f69172 | 263 | register ARG *cur; |
0e3f8c72 | 264 | char *malloc(); |
c9af8668 | 265 | |
53f69172 KB |
266 | if (!(cur = (ARG *)malloc((u_int)sizeof(ARG)))) { |
267 | fputs("last: malloc failure.\n", stderr); | |
0e3f8c72 KB |
268 | exit(1); |
269 | } | |
f322a08e | 270 | cur->next = arglist; |
53f69172 KB |
271 | cur->type = type; |
272 | cur->name = arg; | |
f322a08e KB |
273 | arglist = cur; |
274 | } | |
275 | ||
276 | /* | |
277 | * addtty -- | |
278 | * add an entry to a linked list of ttys | |
279 | */ | |
280 | static TTY * | |
281 | addtty(ttyname) | |
282 | char *ttyname; | |
283 | { | |
284 | register TTY *cur; | |
285 | char *malloc(); | |
286 | ||
287 | if (!(cur = (TTY *)malloc((u_int)sizeof(TTY)))) { | |
288 | fputs("last: malloc failure.\n", stderr); | |
289 | exit(1); | |
290 | } | |
291 | cur->next = ttylist; | |
292 | cur->logout = currentout; | |
293 | bcopy(ttyname, cur->tty, LMAX); | |
294 | return(ttylist = cur); | |
53f69172 KB |
295 | } |
296 | ||
297 | /* | |
298 | * hostconv -- | |
299 | * convert the hostname to search pattern; if the supplied host name | |
300 | * has a domain attached that is the same as the current domain, rip | |
301 | * off the domain suffix since that's what login(1) does. | |
302 | */ | |
303 | static | |
304 | hostconv(arg) | |
305 | char *arg; | |
306 | { | |
307 | static int first = 1; | |
308 | static char *hostdot, | |
309 | name[MAXHOSTNAMELEN]; | |
310 | char *argdot, *index(); | |
311 | ||
312 | if (!(argdot = index(arg, '.'))) | |
313 | return; | |
314 | if (first) { | |
315 | first = 0; | |
316 | if (gethostname(name, sizeof(name))) { | |
317 | perror("last: gethostname"); | |
318 | exit(1); | |
319 | } | |
320 | hostdot = index(name, '.'); | |
321 | } | |
322 | if (hostdot && !strcasecmp(hostdot, argdot)) | |
323 | *argdot = '\0'; | |
324 | } | |
325 | ||
f322a08e KB |
326 | /* |
327 | * ttyconv -- | |
328 | * convert tty to correct name. | |
329 | */ | |
330 | static char * | |
331 | ttyconv(arg) | |
332 | char *arg; | |
333 | { | |
334 | char *mval, | |
335 | *malloc(), *strcpy(); | |
336 | ||
337 | /* | |
338 | * kludge -- we assume that all tty's end with | |
339 | * a two character suffix. | |
340 | */ | |
341 | if (strlen(arg) == 2) { | |
342 | /* either 6 for "ttyxx" or 8 for "console" */ | |
343 | if (!(mval = malloc((u_int)8))) { | |
344 | fputs("last: malloc failure.\n", stderr); | |
345 | exit(1); | |
346 | } | |
ba79f728 | 347 | if (!strcmp(arg, "co")) |
f322a08e KB |
348 | (void)strcpy(mval, "console"); |
349 | else { | |
350 | (void)strcpy(mval, "tty"); | |
351 | (void)strcpy(mval + 3, arg); | |
352 | } | |
353 | return(mval); | |
354 | } | |
355 | if (!strncmp(arg, "/dev/", sizeof("/dev/") - 1)) | |
356 | return(arg + 5); | |
357 | return(arg); | |
358 | } | |
359 | ||
53f69172 KB |
360 | /* |
361 | * onintr -- | |
362 | * on interrupt, we inform the user how far we've gotten | |
363 | */ | |
364 | static | |
365 | onintr(signo) | |
366 | int signo; | |
367 | { | |
368 | char *ct, *ctime(); | |
369 | ||
370 | ct = ctime(&buf[0].ut_time); | |
371 | printf("\ninterrupted %10.10s %5.5s \n", ct, ct + 11); | |
372 | if (signo == SIGINT) | |
373 | exit(1); | |
374 | (void)fflush(stdout); /* fix required for rsh */ | |
c9af8668 | 375 | } |