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22e155fc DF |
1 | /* |
2 | * Copyright (c) 1980 Regents of the University of California. | |
3 | * All rights reserved. The Berkeley software License Agreement | |
4 | * specifies the terms and conditions for redistribution. | |
5 | */ | |
6 | ||
7 | #ifndef lint | |
8 | char copyright[] = | |
9 | "@(#) Copyright (c) 1980 Regents of the University of California.\n\ | |
10 | All rights reserved.\n"; | |
11 | #endif not lint | |
12 | ||
37c640e2 | 13 | #ifndef lint |
f322a08e | 14 | static char sccsid[] = "@(#)last.c 5.8 (Berkeley) %G%"; |
22e155fc | 15 | #endif not lint |
37c640e2 | 16 | |
c9af8668 BJ |
17 | /* |
18 | * last | |
19 | */ | |
53f69172 | 20 | #include <sys/param.h> |
40d69e19 | 21 | #include <sys/stat.h> |
0e3f8c72 KB |
22 | #include <sys/file.h> |
23 | #include <signal.h> | |
24 | #include <time.h> | |
c9af8668 | 25 | #include <utmp.h> |
0e3f8c72 | 26 | #include <stdio.h> |
c9af8668 | 27 | |
53f69172 KB |
28 | #define SECDAY (24*60*60) /* seconds in a day */ |
29 | #define NO 0 /* false/no */ | |
30 | #define YES 1 /* true/yes */ | |
c9af8668 | 31 | |
53f69172 | 32 | static struct utmp buf[1024]; /* utmp read buffer */ |
c9af8668 | 33 | |
53f69172 KB |
34 | #define HMAX sizeof(buf[0].ut_host) /* size of utmp host field */ |
35 | #define LMAX sizeof(buf[0].ut_line) /* size of utmp tty field */ | |
36 | #define NMAX sizeof(buf[0].ut_name) /* size of utmp name field */ | |
37 | ||
38 | typedef struct arg { | |
39 | char *name; /* argument */ | |
40 | #define HOST_TYPE -2 | |
41 | #define TTY_TYPE -3 | |
42 | #define USER_TYPE -4 | |
43 | int type; /* type of arg */ | |
44 | struct arg *next; /* linked list pointer */ | |
45 | } ARG; | |
f322a08e | 46 | ARG *arglist; /* head of linked list */ |
c9af8668 | 47 | |
0e3f8c72 KB |
48 | typedef struct ttytab { |
49 | long logout; /* log out time */ | |
50 | char tty[LMAX + 1]; /* terminal name */ | |
f322a08e KB |
51 | struct ttytab *next; /* linked list pointer */ |
52 | } TTY; | |
53 | TTY *ttylist; /* head of linked list */ | |
c9af8668 | 54 | |
f322a08e KB |
55 | static long currentout, /* current logout value */ |
56 | maxrec; /* records to display */ | |
53f69172 KB |
57 | static char *file = "/usr/adm/wtmp"; /* wtmp file */ |
58 | ||
59 | main(argc, argv) | |
60 | int argc; | |
61 | char **argv; | |
62 | { | |
63 | extern int optind; | |
64 | extern char *optarg; | |
65 | int ch; | |
53f69172 | 66 | long atol(); |
f322a08e | 67 | char *ttyconv(); |
53f69172 KB |
68 | |
69 | while ((ch = getopt(argc, argv, "0123456789f:h:t:")) != EOF) | |
70 | switch((char)ch) { | |
71 | case '0': case '1': case '2': case '3': case '4': | |
72 | case '5': case '6': case '7': case '8': case '9': | |
73 | /* | |
74 | * kludge: last was originally designed to take | |
75 | * a number after a dash. | |
76 | */ | |
77 | if (!maxrec) | |
78 | maxrec = atol(argv[optind - 1] + 1); | |
79 | break; | |
80 | case 'f': | |
81 | file = optarg; | |
82 | break; | |
83 | case 'h': | |
84 | hostconv(optarg); | |
85 | addarg(HOST_TYPE, optarg); | |
86 | break; | |
87 | case 't': | |
f322a08e | 88 | addarg(TTY_TYPE, ttyconv(optarg)); |
53f69172 | 89 | break; |
53f69172 KB |
90 | case '?': |
91 | default: | |
92 | fputs("usage: last [-#] [-f file] [-t tty] [-h hostname] [user ...]\n", stderr); | |
93 | exit(1); | |
94 | } | |
f322a08e KB |
95 | for (argv += optind; *argv; ++argv) { |
96 | #define COMPATIBILITY | |
97 | #ifdef COMPATIBILITY | |
98 | /* code to allow "last p5" to work */ | |
99 | addarg(TTY_TYPE, ttyconv(*argv)); | |
100 | #endif | |
53f69172 | 101 | addarg(USER_TYPE, *argv); |
f322a08e | 102 | } |
53f69172 KB |
103 | wtmp(); |
104 | exit(0); | |
105 | } | |
c9af8668 | 106 | |
53f69172 KB |
107 | /* |
108 | * wtmp -- | |
109 | * read through the wtmp file | |
110 | */ | |
111 | static | |
112 | wtmp() | |
c9af8668 | 113 | { |
0e3f8c72 | 114 | register struct utmp *bp; /* current structure */ |
f322a08e | 115 | register TTY *T; /* tty list entry */ |
0e3f8c72 | 116 | struct stat stb; /* stat of file for size */ |
53f69172 KB |
117 | long bl, delta, /* time difference */ |
118 | lseek(), time(); | |
119 | int bytes, wfd, | |
0e3f8c72 | 120 | onintr(); |
53f69172 KB |
121 | char *ct, *crmsg, |
122 | *asctime(), *ctime(), *strcpy(); | |
f322a08e | 123 | TTY *addtty(); |
0e3f8c72 | 124 | |
53f69172 | 125 | if ((wfd = open(file, O_RDONLY, 0)) < 0 || fstat(wfd, &stb) == -1) { |
0e3f8c72 | 126 | perror(file); |
c9af8668 BJ |
127 | exit(1); |
128 | } | |
0e3f8c72 KB |
129 | bl = (stb.st_size + sizeof(buf) - 1) / sizeof(buf); |
130 | ||
53f69172 KB |
131 | (void)time(&buf[0].ut_time); |
132 | (void)signal(SIGINT, onintr); | |
133 | (void)signal(SIGQUIT, onintr); | |
0e3f8c72 | 134 | |
0e3f8c72 | 135 | while (--bl >= 0) { |
53f69172 KB |
136 | if (lseek(wfd, (long)(bl * sizeof(buf)), L_SET) == -1 || |
137 | (bytes = read(wfd, (char *)buf, sizeof(buf))) == -1) { | |
138 | fprintf(stderr, "last: %s: ", file); | |
139 | perror((char *)NULL); | |
0e3f8c72 KB |
140 | exit(1); |
141 | } | |
53f69172 KB |
142 | for (bp = &buf[bytes / sizeof(buf[0]) - 1]; bp >= buf; --bp) { |
143 | /* | |
144 | * if the terminal line is '~', the machine stopped. | |
145 | * see utmp(5) for more info. | |
146 | */ | |
147 | if (!strncmp(bp->ut_line, "~", LMAX)) { | |
f322a08e KB |
148 | /* everybody just logged out */ |
149 | for (T = ttylist; T; T = T->next) | |
0e3f8c72 | 150 | T->logout = -bp->ut_time; |
f322a08e KB |
151 | currentout = -bp->ut_time; |
152 | crmsg = strncmp(bp->ut_name, "shutdown", NMAX) ? "crash" : "down "; | |
0e3f8c72 | 153 | if (!bp->ut_name[0]) |
53f69172 KB |
154 | (void)strcpy(bp->ut_name, "reboot"); |
155 | if (want(bp, NO)) { | |
0e3f8c72 | 156 | ct = ctime(&bp->ut_time); |
53f69172 KB |
157 | 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); |
158 | if (maxrec && !--maxrec) | |
159 | return; | |
0e3f8c72 KB |
160 | } |
161 | continue; | |
c9af8668 | 162 | } |
f322a08e KB |
163 | /* find associated tty */ |
164 | for (T = ttylist;; T = T->next) { | |
165 | if (!T) { | |
166 | /* add new one */ | |
167 | T = addtty(bp->ut_line); | |
c9af8668 BJ |
168 | break; |
169 | } | |
53f69172 | 170 | if (!strncmp(T->tty, bp->ut_line, LMAX)) |
c9af8668 | 171 | break; |
c9af8668 | 172 | } |
53f69172 | 173 | if (bp->ut_name[0] && want(bp, YES)) { |
0e3f8c72 | 174 | ct = ctime(&bp->ut_time); |
53f69172 | 175 | 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 |
176 | if (!T->logout) |
177 | puts(" still logged in"); | |
c9af8668 | 178 | else { |
0e3f8c72 KB |
179 | if (T->logout < 0) { |
180 | T->logout = -T->logout; | |
53f69172 | 181 | printf("- %s", crmsg); |
0e3f8c72 KB |
182 | } |
183 | else | |
53f69172 | 184 | printf("- %5.5s", ctime(&T->logout)+11); |
0e3f8c72 | 185 | delta = T->logout - bp->ut_time; |
c9af8668 | 186 | if (delta < SECDAY) |
53f69172 | 187 | printf(" (%5.5s)\n", asctime(gmtime(&delta))+11); |
c9af8668 | 188 | else |
53f69172 | 189 | printf(" (%ld+%5.5s)\n", delta / SECDAY, asctime(gmtime(&delta))+11); |
c9af8668 | 190 | } |
0e3f8c72 | 191 | if (maxrec != -1 && !--maxrec) |
53f69172 | 192 | return; |
c9af8668 | 193 | } |
0e3f8c72 | 194 | T->logout = bp->ut_time; |
c9af8668 BJ |
195 | } |
196 | } | |
197 | ct = ctime(&buf[0].ut_time); | |
53f69172 | 198 | printf("\nwtmp begins %10.10s %5.5s \n", ct, ct + 11); |
c9af8668 BJ |
199 | } |
200 | ||
53f69172 KB |
201 | /* |
202 | * want -- | |
203 | * see if want this entry | |
204 | */ | |
205 | static | |
206 | want(bp, check) | |
207 | register struct utmp *bp; | |
208 | int check; | |
c9af8668 | 209 | { |
53f69172 | 210 | register ARG *step; |
0e3f8c72 | 211 | |
ed99b1a7 | 212 | if (check) |
0e3f8c72 | 213 | /* |
f322a08e KB |
214 | * when uucp and ftp log in over a network, the entry in |
215 | * the utmp file is the name plus their process id. See | |
216 | * etc/ftpd.c and usr.bin/uucp/uucpd.c for more information. | |
0e3f8c72 | 217 | */ |
f322a08e | 218 | if (!strncmp(bp->ut_line, "ftp", sizeof("ftp") - 1)) |
0e3f8c72 | 219 | bp->ut_line[3] = '\0'; |
f322a08e | 220 | else if (!strncmp(bp->ut_line, "uucp", sizeof("uucp") - 1)) |
0e3f8c72 | 221 | bp->ut_line[4] = '\0'; |
f322a08e | 222 | if (!arglist) |
0e3f8c72 | 223 | return(YES); |
53f69172 | 224 | |
f322a08e | 225 | for (step = arglist; step; step = step->next) |
53f69172 KB |
226 | switch(step->type) { |
227 | case HOST_TYPE: | |
228 | if (!strncasecmp(step->name, bp->ut_host, HMAX)) | |
229 | return(YES); | |
230 | break; | |
231 | case TTY_TYPE: | |
232 | if (!strncmp(step->name, bp->ut_line, LMAX)) | |
233 | return(YES); | |
234 | break; | |
235 | case USER_TYPE: | |
236 | if (!strncmp(step->name, bp->ut_name, NMAX)) | |
237 | return(YES); | |
238 | break; | |
ed99b1a7 | 239 | } |
0e3f8c72 | 240 | return(NO); |
c9af8668 BJ |
241 | } |
242 | ||
53f69172 KB |
243 | /* |
244 | * addarg -- | |
245 | * add an entry to a linked list of arguments | |
246 | */ | |
247 | static | |
248 | addarg(type, arg) | |
249 | int type; | |
250 | char *arg; | |
c9af8668 | 251 | { |
53f69172 | 252 | register ARG *cur; |
0e3f8c72 | 253 | char *malloc(); |
c9af8668 | 254 | |
53f69172 KB |
255 | if (!(cur = (ARG *)malloc((u_int)sizeof(ARG)))) { |
256 | fputs("last: malloc failure.\n", stderr); | |
0e3f8c72 KB |
257 | exit(1); |
258 | } | |
f322a08e | 259 | cur->next = arglist; |
53f69172 KB |
260 | cur->type = type; |
261 | cur->name = arg; | |
f322a08e KB |
262 | arglist = cur; |
263 | } | |
264 | ||
265 | /* | |
266 | * addtty -- | |
267 | * add an entry to a linked list of ttys | |
268 | */ | |
269 | static TTY * | |
270 | addtty(ttyname) | |
271 | char *ttyname; | |
272 | { | |
273 | register TTY *cur; | |
274 | char *malloc(); | |
275 | ||
276 | if (!(cur = (TTY *)malloc((u_int)sizeof(TTY)))) { | |
277 | fputs("last: malloc failure.\n", stderr); | |
278 | exit(1); | |
279 | } | |
280 | cur->next = ttylist; | |
281 | cur->logout = currentout; | |
282 | bcopy(ttyname, cur->tty, LMAX); | |
283 | return(ttylist = cur); | |
53f69172 KB |
284 | } |
285 | ||
286 | /* | |
287 | * hostconv -- | |
288 | * convert the hostname to search pattern; if the supplied host name | |
289 | * has a domain attached that is the same as the current domain, rip | |
290 | * off the domain suffix since that's what login(1) does. | |
291 | */ | |
292 | static | |
293 | hostconv(arg) | |
294 | char *arg; | |
295 | { | |
296 | static int first = 1; | |
297 | static char *hostdot, | |
298 | name[MAXHOSTNAMELEN]; | |
299 | char *argdot, *index(); | |
300 | ||
301 | if (!(argdot = index(arg, '.'))) | |
302 | return; | |
303 | if (first) { | |
304 | first = 0; | |
305 | if (gethostname(name, sizeof(name))) { | |
306 | perror("last: gethostname"); | |
307 | exit(1); | |
308 | } | |
309 | hostdot = index(name, '.'); | |
310 | } | |
311 | if (hostdot && !strcasecmp(hostdot, argdot)) | |
312 | *argdot = '\0'; | |
313 | } | |
314 | ||
f322a08e KB |
315 | /* |
316 | * ttyconv -- | |
317 | * convert tty to correct name. | |
318 | */ | |
319 | static char * | |
320 | ttyconv(arg) | |
321 | char *arg; | |
322 | { | |
323 | char *mval, | |
324 | *malloc(), *strcpy(); | |
325 | ||
326 | /* | |
327 | * kludge -- we assume that all tty's end with | |
328 | * a two character suffix. | |
329 | */ | |
330 | if (strlen(arg) == 2) { | |
331 | /* either 6 for "ttyxx" or 8 for "console" */ | |
332 | if (!(mval = malloc((u_int)8))) { | |
333 | fputs("last: malloc failure.\n", stderr); | |
334 | exit(1); | |
335 | } | |
336 | if (!strcmp(optarg, "co")) | |
337 | (void)strcpy(mval, "console"); | |
338 | else { | |
339 | (void)strcpy(mval, "tty"); | |
340 | (void)strcpy(mval + 3, arg); | |
341 | } | |
342 | return(mval); | |
343 | } | |
344 | if (!strncmp(arg, "/dev/", sizeof("/dev/") - 1)) | |
345 | return(arg + 5); | |
346 | return(arg); | |
347 | } | |
348 | ||
53f69172 KB |
349 | /* |
350 | * onintr -- | |
351 | * on interrupt, we inform the user how far we've gotten | |
352 | */ | |
353 | static | |
354 | onintr(signo) | |
355 | int signo; | |
356 | { | |
357 | char *ct, *ctime(); | |
358 | ||
359 | ct = ctime(&buf[0].ut_time); | |
360 | printf("\ninterrupted %10.10s %5.5s \n", ct, ct + 11); | |
361 | if (signo == SIGINT) | |
362 | exit(1); | |
363 | (void)fflush(stdout); /* fix required for rsh */ | |
c9af8668 | 364 | } |