last.c revision 1.16
1 /* $NetBSD: last.c,v 1.16 2003/02/17 15:08:57 christos Exp $ */ 2 3 /* 4 * Copyright (c) 1987, 1993, 1994 5 * The Regents of the University of California. All rights reserved. 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 the University of 18 * California, Berkeley and its contributors. 19 * 4. Neither the name of the University nor the names of its contributors 20 * may be used to endorse or promote products derived from this software 21 * without specific prior written permission. 22 * 23 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 24 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 25 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 26 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 27 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 28 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 29 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 30 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 31 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 32 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 33 * SUCH DAMAGE. 34 */ 35 36 #include <sys/cdefs.h> 37 #ifndef lint 38 __COPYRIGHT( 39 "@(#) Copyright (c) 1987, 1993, 1994\n\ 40 The Regents of the University of California. All rights reserved.\n"); 41 #endif /* not lint */ 42 43 #ifndef lint 44 #if 0 45 static char sccsid[] = "@(#)last.c 8.2 (Berkeley) 4/2/94"; 46 #endif 47 __RCSID("$NetBSD: last.c,v 1.16 2003/02/17 15:08:57 christos Exp $"); 48 #endif /* not lint */ 49 50 #include <sys/param.h> 51 #include <sys/stat.h> 52 53 #include <err.h> 54 #include <fcntl.h> 55 #include <paths.h> 56 #include <signal.h> 57 #include <stdio.h> 58 #include <stdlib.h> 59 #include <string.h> 60 #include <time.h> 61 #include <tzfile.h> 62 #include <unistd.h> 63 #ifdef SUPPORT_UTMPX 64 #include <utmpx.h> 65 #endif 66 #ifdef SUPPORT_UTMP 67 #include <utmp.h> 68 #endif 69 70 #ifndef UT_NAMESIZE 71 #define UT_NAMESIZE 8 72 #define UT_LINESIZE 8 73 #define UT_HOSTSIZE 16 74 #endif 75 #ifndef SIGNATURE 76 #define SIGNATURE -1 77 #endif 78 79 80 81 #define NO 0 /* false/no */ 82 #define YES 1 /* true/yes */ 83 84 #define TBUFLEN 30 /* length of time string buffer */ 85 #define TFMT "%a %b %d %R" /* strftime format string */ 86 #define LTFMT "%a %b %d %Y %T" /* strftime long format string */ 87 #define TFMTS "%R" /* strftime format string - time only */ 88 #define LTFMTS "%T" /* strftime long format string - " */ 89 90 /* fmttime() flags */ 91 #define FULLTIME 0x1 /* show year, seconds */ 92 #define TIMEONLY 0x2 /* show time only, not date */ 93 #define GMT 0x4 /* show time at GMT, for offsets only */ 94 95 #define MAXUTMP 1024; 96 97 typedef struct arg { 98 char *name; /* argument */ 99 #define HOST_TYPE -2 100 #define TTY_TYPE -3 101 #define USER_TYPE -4 102 int type; /* type of arg */ 103 struct arg *next; /* linked list pointer */ 104 } ARG; 105 static ARG *arglist; /* head of linked list */ 106 107 typedef struct ttytab { 108 time_t logout; /* log out time */ 109 char tty[128]; /* terminal name */ 110 struct ttytab *next; /* linked list pointer */ 111 } TTY; 112 static TTY *ttylist; /* head of linked list */ 113 114 static time_t currentout; /* current logout value */ 115 static long maxrec; /* records to display */ 116 static int fulltime = 0; /* Display seconds? */ 117 118 int main(int, char *[]); 119 120 static void addarg(int, char *); 121 static TTY *addtty(const char *); 122 static void hostconv(char *); 123 static char *ttyconv(char *); 124 #ifdef SUPPORT_UTMPX 125 static void wtmpx(const char *, int, int, int); 126 #endif 127 #ifdef SUPPORT_UTMP 128 static void wtmp(const char *, int, int, int); 129 #endif 130 static char *fmttime(time_t, int); 131 static void usage(void); 132 133 static 134 void usage(void) 135 { 136 (void)fprintf(stderr, "Usage: %s [-#%s] [-f file] [-t tty]" 137 " [-h hostname] [-T] [user ...]\n", getprogname(), 138 #ifdef SUPPORT_UTMPX 139 "w" 140 #else 141 "" 142 #endif 143 ); 144 exit(1); 145 } 146 147 int 148 main(int argc, char *argv[]) 149 { 150 int ch; 151 char *p; 152 char *file = NULL; 153 int namesize = UT_NAMESIZE; 154 int linesize = UT_LINESIZE; 155 int hostsize = UT_HOSTSIZE; 156 157 maxrec = -1; 158 159 while ((ch = getopt(argc, argv, "0123456789f:h:H:L:N:t:T")) != -1) 160 switch (ch) { 161 case '0': case '1': case '2': case '3': case '4': 162 case '5': case '6': case '7': case '8': case '9': 163 /* 164 * kludge: last was originally designed to take 165 * a number after a dash. 166 */ 167 if (maxrec == -1) { 168 p = argv[optind - 1]; 169 if (p[0] == '-' && p[1] == ch && !p[2]) 170 maxrec = atol(++p); 171 else 172 maxrec = atol(argv[optind] + 1); 173 if (!maxrec) 174 exit(0); 175 } 176 break; 177 case 'f': 178 file = optarg; 179 break; 180 case 'h': 181 hostconv(optarg); 182 addarg(HOST_TYPE, optarg); 183 break; 184 case 't': 185 addarg(TTY_TYPE, ttyconv(optarg)); 186 break; 187 case 'U': 188 namesize = atoi(optarg); 189 break; 190 case 'L': 191 linesize = atoi(optarg); 192 break; 193 case 'H': 194 hostsize = atoi(optarg); 195 break; 196 case 'T': 197 fulltime = 1; 198 break; 199 case '?': 200 default: 201 usage(); 202 } 203 204 if (argc) { 205 setlinebuf(stdout); 206 for (argv += optind; *argv; ++argv) { 207 #define COMPATIBILITY 208 #ifdef COMPATIBILITY 209 /* code to allow "last p5" to work */ 210 addarg(TTY_TYPE, ttyconv(*argv)); 211 #endif 212 addarg(USER_TYPE, *argv); 213 } 214 } 215 if (file == NULL) { 216 #ifdef SUPPORT_UTMPX 217 if (access(_PATH_WTMPX, R_OK) == 0) 218 file = _PATH_WTMPX; 219 else 220 #endif 221 #ifdef SUPPORT_UTMP 222 if (access(_PATH_WTMP, R_OK) == 0) 223 file = _PATH_WTMP; 224 #endif 225 if (file == NULL) 226 #if defined(SUPPORT_UTMPX) && defined(SUPPORT_UTMP) 227 errx(1, "Cannot access `%s' or `%s'", _PATH_WTMPX, 228 _PATH_WTMP); 229 #elif defined(SUPPORT_UTMPX) 230 errx(1, "Cannot access `%s'", _PATH_WTMPX); 231 #elif defined(SUPPORT_UTMP) 232 errx(1, "Cannot access `%s'", _PATH_WTMP); 233 #else 234 errx(1, "No utmp or utmpx support compiled in."); 235 #endif 236 } 237 #if defined(SUPPORT_UTMPX) && defined(SUPPORT_UTMP) 238 if (file[strlen(file) - 1] == 'x') 239 wtmpx(file, namesize, linesize, hostsize); 240 else 241 wtmp(file, namesize, linesize, hostsize); 242 #elif defined(SUPPORT_UTMPX) 243 wtmpx(file, namesize, linesize, hostsize); 244 #elif defined(SUPPORT_UTMP) 245 wtmp(file, namesize, linesize, hostsize); 246 #else 247 errx(1, "Nu utmp or utmpx support compiled in."); 248 #endif 249 exit(0); 250 } 251 252 253 /* 254 * addarg -- 255 * add an entry to a linked list of arguments 256 */ 257 static void 258 addarg(int type, char *arg) 259 { 260 ARG *cur; 261 262 if (!(cur = (ARG *)malloc((u_int)sizeof(ARG)))) 263 err(1, "malloc failure"); 264 cur->next = arglist; 265 cur->type = type; 266 cur->name = arg; 267 arglist = cur; 268 } 269 270 /* 271 * addtty -- 272 * add an entry to a linked list of ttys 273 */ 274 static TTY * 275 addtty(const char *ttyname) 276 { 277 TTY *cur; 278 279 if (!(cur = (TTY *)malloc((u_int)sizeof(TTY)))) 280 err(1, "malloc failure"); 281 cur->next = ttylist; 282 cur->logout = currentout; 283 memmove(cur->tty, ttyname, sizeof(cur->tty)); 284 return (ttylist = cur); 285 } 286 287 /* 288 * hostconv -- 289 * convert the hostname to search pattern; if the supplied host name 290 * has a domain attached that is the same as the current domain, rip 291 * off the domain suffix since that's what login(1) does. 292 */ 293 static void 294 hostconv(char *arg) 295 { 296 static int first = 1; 297 static char *hostdot, name[MAXHOSTNAMELEN + 1]; 298 char *argdot; 299 300 if (!(argdot = strchr(arg, '.'))) 301 return; 302 if (first) { 303 first = 0; 304 if (gethostname(name, sizeof(name))) 305 err(1, "gethostname"); 306 name[sizeof(name) - 1] = '\0'; 307 hostdot = strchr(name, '.'); 308 } 309 if (hostdot && !strcasecmp(hostdot, argdot)) 310 *argdot = '\0'; 311 } 312 313 /* 314 * ttyconv -- 315 * convert tty to correct name. 316 */ 317 static char * 318 ttyconv(char *arg) 319 { 320 char *mval; 321 322 /* 323 * kludge -- we assume that all tty's end with 324 * a two character suffix. 325 */ 326 if (strlen(arg) == 2) { 327 /* either 6 for "ttyxx" or 8 for "console" */ 328 if (!(mval = malloc((u_int)8))) 329 err(1, "malloc failure"); 330 if (!strcmp(arg, "co")) 331 (void)strcpy(mval, "console"); 332 else { 333 (void)strcpy(mval, "tty"); 334 (void)strcpy(mval + 3, arg); 335 } 336 return (mval); 337 } 338 if (!strncmp(arg, _PATH_DEV, sizeof(_PATH_DEV) - 1)) 339 return (arg + 5); 340 return (arg); 341 } 342 343 /* 344 * fmttime -- 345 * return pointer to (static) formatted time string. 346 */ 347 static char * 348 fmttime(time_t t, int flags) 349 { 350 struct tm *tm; 351 static char tbuf[TBUFLEN]; 352 353 tm = (flags & GMT) ? gmtime(&t) : localtime(&t); 354 strftime(tbuf, sizeof(tbuf), 355 (flags & TIMEONLY) 356 ? (flags & FULLTIME ? LTFMTS : TFMTS) 357 : (flags & FULLTIME ? LTFMT : TFMT), 358 tm); 359 return (tbuf); 360 } 361 362 #ifdef SUPPORT_UTMP 363 #define TYPE(a) 0 364 #define NAMESIZE UT_NAMESIZE 365 #define LINESIZE UT_LINESIZE 366 #define HOSTSIZE UT_HOSTSIZE 367 #define ut_timefld ut_time 368 #define FIRSTVALID 0 369 #include "want.c" 370 #undef TYPE(a) 371 #undef NAMESIZE 372 #undef LINESIZE 373 #undef HOSTSIZE 374 #undef ut_timefld 375 #undef FIRSTVALID 376 #endif 377 378 #ifdef SUPPORT_UTMPX 379 #define utmp utmpx 380 #define want wantx 381 #define wtmp wtmpx 382 #define buf bufx 383 #define onintr onintrx 384 #define TYPE(a) (a)->ut_type 385 #define NAMESIZE UTX_USERSIZE 386 #define LINESIZE UTX_LINESIZE 387 #define HOSTSIZE UTX_HOSTSIZE 388 #define ut_timefld ut_xtime 389 #define FIRSTVALID 1 390 #include "want.c" 391 #endif 392
Indexes created Tue Sep 30 07:10:03 GMT 2025