1 /* 2 * Copyright (c) 1987, 1993, 1994 3 * The Regents of the University of California. All rights reserved. 4 * 5 * %sccs.include.redist.c% 6 */ 7 8 #ifndef lint 9 static char copyright[] = 10 "@(#) Copyright (c) 1987, 1993, 1994\n\ 11 The Regents of the University of California. All rights reserved.\n"; 12 #endif /* not lint */ 13 14 #ifndef lint 15 static char sccsid[] = "@(#)last.c 8.2 (Berkeley) 04/02/94"; 16 #endif /* not lint */ 17 18 #include <sys/param.h> 19 #include <sys/stat.h> 20 21 #include <err.h> 22 #include <fcntl.h> 23 #include <paths.h> 24 #include <signal.h> 25 #include <stdio.h> 26 #include <stdlib.h> 27 #include <string.h> 28 #include <time.h> 29 #include <tzfile.h> 30 #include <unistd.h> 31 #include <utmp.h> 32 33 #define NO 0 /* false/no */ 34 #define YES 1 /* true/yes */ 35 36 static struct utmp buf[1024]; /* utmp read buffer */ 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; 46 ARG *arglist; /* head of linked list */ 47 48 typedef struct ttytab { 49 long logout; /* log out time */ 50 char tty[UT_LINESIZE + 1]; /* terminal name */ 51 struct ttytab *next; /* linked list pointer */ 52 } TTY; 53 TTY *ttylist; /* head of linked list */ 54 55 static long currentout, /* current logout value */ 56 maxrec; /* records to display */ 57 static char *file = _PATH_WTMP; /* wtmp file */ 58 59 void addarg __P((int, char *)); 60 TTY *addtty __P((char *)); 61 void hostconv __P((char *)); 62 void onintr __P((int)); 63 char *ttyconv __P((char *)); 64 int want __P((struct utmp *, int)); 65 void wtmp __P((void)); 66 67 int 68 main(argc, argv) 69 int argc; 70 char *argv[]; 71 { 72 extern int optind; 73 extern char *optarg; 74 int ch; 75 char *p; 76 77 maxrec = -1; 78 while ((ch = getopt(argc, argv, "0123456789f:h:t:")) != EOF) 79 switch (ch) { 80 case '0': case '1': case '2': case '3': case '4': 81 case '5': case '6': case '7': case '8': case '9': 82 /* 83 * kludge: last was originally designed to take 84 * a number after a dash. 85 */ 86 if (maxrec == -1) { 87 p = argv[optind - 1]; 88 if (p[0] == '-' && p[1] == ch && !p[2]) 89 maxrec = atol(++p); 90 else 91 maxrec = atol(argv[optind] + 1); 92 if (!maxrec) 93 exit(0); 94 } 95 break; 96 case 'f': 97 file = optarg; 98 break; 99 case 'h': 100 hostconv(optarg); 101 addarg(HOST_TYPE, optarg); 102 break; 103 case 't': 104 addarg(TTY_TYPE, ttyconv(optarg)); 105 break; 106 case '?': 107 default: 108 (void)fprintf(stderr, 109 "usage: last [-#] [-f file] [-t tty] [-h hostname] [user ...]\n"); 110 exit(1); 111 } 112 113 if (argc) { 114 setlinebuf(stdout); 115 for (argv += optind; *argv; ++argv) { 116 #define COMPATIBILITY 117 #ifdef COMPATIBILITY 118 /* code to allow "last p5" to work */ 119 addarg(TTY_TYPE, ttyconv(*argv)); 120 #endif 121 addarg(USER_TYPE, *argv); 122 } 123 } 124 wtmp(); 125 exit(0); 126 } 127 128 /* 129 * wtmp -- 130 * read through the wtmp file 131 */ 132 void 133 wtmp() 134 { 135 struct utmp *bp; /* current structure */ 136 TTY *T; /* tty list entry */ 137 struct stat stb; /* stat of file for size */ 138 long bl, delta; /* time difference */ 139 int bytes, wfd; 140 char *ct, *crmsg; 141 142 if ((wfd = open(file, O_RDONLY, 0)) < 0 || fstat(wfd, &stb) == -1) 143 err(1, "%s", file); 144 bl = (stb.st_size + sizeof(buf) - 1) / sizeof(buf); 145 146 (void)time(&buf[0].ut_time); 147 (void)signal(SIGINT, onintr); 148 (void)signal(SIGQUIT, onintr); 149 150 while (--bl >= 0) { 151 if (lseek(wfd, (off_t)(bl * sizeof(buf)), L_SET) == -1 || 152 (bytes = read(wfd, buf, sizeof(buf))) == -1) 153 err(1, "%s", file); 154 for (bp = &buf[bytes / sizeof(buf[0]) - 1]; bp >= buf; --bp) { 155 /* 156 * if the terminal line is '~', the machine stopped. 157 * see utmp(5) for more info. 158 */ 159 if (bp->ut_line[0] == '~' && !bp->ut_line[1]) { 160 /* everybody just logged out */ 161 for (T = ttylist; T; T = T->next) 162 T->logout = -bp->ut_time; 163 currentout = -bp->ut_time; 164 crmsg = strncmp(bp->ut_name, "shutdown", 165 UT_NAMESIZE) ? "crash" : "shutdown"; 166 if (want(bp, NO)) { 167 ct = ctime(&bp->ut_time); 168 printf("%-*.*s %-*.*s %-*.*s %10.10s %5.5s \n", 169 UT_NAMESIZE, UT_NAMESIZE, 170 bp->ut_name, UT_LINESIZE, 171 UT_LINESIZE, bp->ut_line, 172 UT_HOSTSIZE, UT_HOSTSIZE, 173 bp->ut_host, ct, ct + 11); 174 if (maxrec != -1 && !--maxrec) 175 return; 176 } 177 continue; 178 } 179 /* 180 * if the line is '{' or '|', date got set; see 181 * utmp(5) for more info. 182 */ 183 if ((bp->ut_line[0] == '{' || bp->ut_line[0] == '|') 184 && !bp->ut_line[1]) { 185 if (want(bp, NO)) { 186 ct = ctime(&bp->ut_time); 187 printf("%-*.*s %-*.*s %-*.*s %10.10s %5.5s \n", 188 UT_NAMESIZE, UT_NAMESIZE, bp->ut_name, 189 UT_LINESIZE, UT_LINESIZE, bp->ut_line, 190 UT_HOSTSIZE, UT_HOSTSIZE, bp->ut_host, 191 ct, ct + 11); 192 if (maxrec && !--maxrec) 193 return; 194 } 195 continue; 196 } 197 /* find associated tty */ 198 for (T = ttylist;; T = T->next) { 199 if (!T) { 200 /* add new one */ 201 T = addtty(bp->ut_line); 202 break; 203 } 204 if (!strncmp(T->tty, bp->ut_line, UT_LINESIZE)) 205 break; 206 } 207 if (bp->ut_name[0] && want(bp, YES)) { 208 ct = ctime(&bp->ut_time); 209 printf("%-*.*s %-*.*s %-*.*s %10.10s %5.5s ", 210 UT_NAMESIZE, UT_NAMESIZE, bp->ut_name, 211 UT_LINESIZE, UT_LINESIZE, bp->ut_line, 212 UT_HOSTSIZE, UT_HOSTSIZE, bp->ut_host, 213 ct, ct + 11); 214 if (!T->logout) 215 puts(" still logged in"); 216 else { 217 if (T->logout < 0) { 218 T->logout = -T->logout; 219 printf("- %s", crmsg); 220 } 221 else 222 printf("- %5.5s", 223 ctime(&T->logout)+11); 224 delta = T->logout - bp->ut_time; 225 if (delta < SECSPERDAY) 226 printf(" (%5.5s)\n", 227 asctime(gmtime(&delta))+11); 228 else 229 printf(" (%ld+%5.5s)\n", 230 delta / SECSPERDAY, 231 asctime(gmtime(&delta))+11); 232 } 233 if (maxrec != -1 && !--maxrec) 234 return; 235 } 236 T->logout = bp->ut_time; 237 } 238 } 239 ct = ctime(&buf[0].ut_time); 240 printf("\nwtmp begins %10.10s %5.5s \n", ct, ct + 11); 241 } 242 243 /* 244 * want -- 245 * see if want this entry 246 */ 247 int 248 want(bp, check) 249 struct utmp *bp; 250 int check; 251 { 252 ARG *step; 253 254 if (check) 255 /* 256 * when uucp and ftp log in over a network, the entry in 257 * the utmp file is the name plus their process id. See 258 * etc/ftpd.c and usr.bin/uucp/uucpd.c for more information. 259 */ 260 if (!strncmp(bp->ut_line, "ftp", sizeof("ftp") - 1)) 261 bp->ut_line[3] = '\0'; 262 else if (!strncmp(bp->ut_line, "uucp", sizeof("uucp") - 1)) 263 bp->ut_line[4] = '\0'; 264 if (!arglist) 265 return (YES); 266 267 for (step = arglist; step; step = step->next) 268 switch(step->type) { 269 case HOST_TYPE: 270 if (!strncasecmp(step->name, bp->ut_host, UT_HOSTSIZE)) 271 return (YES); 272 break; 273 case TTY_TYPE: 274 if (!strncmp(step->name, bp->ut_line, UT_LINESIZE)) 275 return (YES); 276 break; 277 case USER_TYPE: 278 if (!strncmp(step->name, bp->ut_name, UT_NAMESIZE)) 279 return (YES); 280 break; 281 } 282 return (NO); 283 } 284 285 /* 286 * addarg -- 287 * add an entry to a linked list of arguments 288 */ 289 void 290 addarg(type, arg) 291 int type; 292 char *arg; 293 { 294 ARG *cur; 295 296 if (!(cur = (ARG *)malloc((u_int)sizeof(ARG)))) 297 err(1, "malloc failure"); 298 cur->next = arglist; 299 cur->type = type; 300 cur->name = arg; 301 arglist = cur; 302 } 303 304 /* 305 * addtty -- 306 * add an entry to a linked list of ttys 307 */ 308 TTY * 309 addtty(ttyname) 310 char *ttyname; 311 { 312 TTY *cur; 313 314 if (!(cur = (TTY *)malloc((u_int)sizeof(TTY)))) 315 err(1, "malloc failure"); 316 cur->next = ttylist; 317 cur->logout = currentout; 318 memmove(cur->tty, ttyname, UT_LINESIZE); 319 return (ttylist = cur); 320 } 321 322 /* 323 * hostconv -- 324 * convert the hostname to search pattern; if the supplied host name 325 * has a domain attached that is the same as the current domain, rip 326 * off the domain suffix since that's what login(1) does. 327 */ 328 void 329 hostconv(arg) 330 char *arg; 331 { 332 static int first = 1; 333 static char *hostdot, name[MAXHOSTNAMELEN]; 334 char *argdot; 335 336 if (!(argdot = strchr(arg, '.'))) 337 return; 338 if (first) { 339 first = 0; 340 if (gethostname(name, sizeof(name))) 341 err(1, "gethostname"); 342 hostdot = strchr(name, '.'); 343 } 344 if (hostdot && !strcasecmp(hostdot, argdot)) 345 *argdot = '\0'; 346 } 347 348 /* 349 * ttyconv -- 350 * convert tty to correct name. 351 */ 352 char * 353 ttyconv(arg) 354 char *arg; 355 { 356 char *mval; 357 358 /* 359 * kludge -- we assume that all tty's end with 360 * a two character suffix. 361 */ 362 if (strlen(arg) == 2) { 363 /* either 6 for "ttyxx" or 8 for "console" */ 364 if (!(mval = malloc((u_int)8))) 365 err(1, "malloc failure"); 366 if (!strcmp(arg, "co")) 367 (void)strcpy(mval, "console"); 368 else { 369 (void)strcpy(mval, "tty"); 370 (void)strcpy(mval + 3, arg); 371 } 372 return (mval); 373 } 374 if (!strncmp(arg, _PATH_DEV, sizeof(_PATH_DEV) - 1)) 375 return (arg + 5); 376 return (arg); 377 } 378 379 /* 380 * onintr -- 381 * on interrupt, we inform the user how far we've gotten 382 */ 383 void 384 onintr(signo) 385 int signo; 386 { 387 char *ct; 388 389 ct = ctime(&buf[0].ut_time); 390 printf("\ninterrupted %10.10s %5.5s \n", ct, ct + 11); 391 if (signo == SIGINT) 392 exit(1); 393 (void)fflush(stdout); /* fix required for rsh */ 394 } 395