1 /* $NetBSD: last.c,v 1.36 2012/03/15 03:04:05 dholland 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. Neither the name of the University nor the names of its contributors 16 * may be used to endorse or promote products derived from this software 17 * without specific prior written permission. 18 * 19 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 20 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 21 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 22 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 23 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 24 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 25 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 26 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 27 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 28 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 29 * SUCH DAMAGE. 30 */ 31 32 #include <sys/cdefs.h> 33 #ifndef lint 34 __COPYRIGHT("@(#) Copyright (c) 1987, 1993, 1994\ 35 The Regents of the University of California. All rights reserved."); 36 #endif /* not lint */ 37 38 #ifndef lint 39 #if 0 40 static char sccsid[] = "@(#)last.c 8.2 (Berkeley) 4/2/94"; 41 #endif 42 __RCSID("$NetBSD: last.c,v 1.36 2012/03/15 03:04:05 dholland Exp $"); 43 #endif /* not lint */ 44 45 #include <sys/param.h> 46 #include <sys/stat.h> 47 48 #include <err.h> 49 #include <errno.h> 50 #include <fcntl.h> 51 #include <paths.h> 52 #include <stdio.h> 53 #include <stdlib.h> 54 #include <string.h> 55 #include <time.h> 56 #include <tzfile.h> 57 #include <unistd.h> 58 #include <arpa/inet.h> 59 #ifdef SUPPORT_UTMPX 60 #include <utmpx.h> 61 #endif 62 #ifdef SUPPORT_UTMP 63 #include <utmp.h> 64 #endif 65 #include <util.h> 66 67 #ifndef UT_NAMESIZE 68 #define UT_NAMESIZE 8 69 #define UT_LINESIZE 8 70 #define UT_HOSTSIZE 16 71 #endif 72 #ifndef SIGNATURE 73 #define SIGNATURE -1 74 #endif 75 76 77 78 #define NO 0 /* false/no */ 79 #define YES 1 /* true/yes */ 80 81 #define TBUFLEN 30 /* length of time string buffer */ 82 #define TFMT "%a %b %d %R" /* strftime format string */ 83 #define LTFMT "%a %b %d %Y %T" /* strftime long format string */ 84 #define TFMTS "%R" /* strftime format string - time only */ 85 #define LTFMTS "%T" /* strftime long format string - " */ 86 87 /* fmttime() flags */ 88 #define FULLTIME 0x1 /* show year, seconds */ 89 #define TIMEONLY 0x2 /* show time only, not date */ 90 #define GMT 0x4 /* show time at GMT, for offsets only */ 91 92 #define MAXUTMP 1024 93 94 typedef struct arg { 95 const char *name; /* argument */ 96 #define HOST_TYPE -2 97 #define TTY_TYPE -3 98 #define USER_TYPE -4 99 int type; /* type of arg */ 100 struct arg *next; /* linked list pointer */ 101 } ARG; 102 static ARG *arglist; /* head of linked list */ 103 104 typedef struct ttytab { 105 time_t logout; /* log out time */ 106 char tty[128]; /* terminal name */ 107 struct ttytab *next; /* linked list pointer */ 108 } TTY; 109 static TTY *ttylist; /* head of linked list */ 110 111 static time_t currentout; /* current logout value */ 112 static long maxrec; /* records to display */ 113 static int fulltime = 0; /* Display seconds? */ 114 static int xflag; /* Assume file is wtmpx format */ 115 116 static void addarg(int, const char *); 117 static TTY *addtty(const char *); 118 static void hostconv(char *); 119 static const char *ttyconv(char *); 120 #ifdef SUPPORT_UTMPX 121 static void wtmpx(const char *, int, int, int, int); 122 #endif 123 #ifdef SUPPORT_UTMP 124 static void wtmp(const char *, int, int, int, int); 125 #endif 126 static char *fmttime(time_t, int); 127 __dead static void usage(void); 128 129 static 130 void usage(void) 131 { 132 (void)fprintf(stderr, "usage: %s [-#%s] [-nTx] [-f file]" 133 " [-H hostsize] [-h host] [-L linesize]\n" 134 "\t [-N namesize] [-t tty] [user ...]\n", getprogname(), 135 #ifdef NOTYET_SUPPORT_UTMPX 136 "w" 137 #else 138 "" 139 #endif 140 ); 141 exit(EXIT_FAILURE); 142 } 143 144 int 145 main(int argc, char *argv[]) 146 { 147 int ch; 148 char *p; 149 const char *file = NULL; 150 int namesize = UT_NAMESIZE; 151 int linesize = UT_LINESIZE; 152 int hostsize = UT_HOSTSIZE; 153 int numeric = 0; 154 155 maxrec = -1; 156 157 while ((ch = getopt(argc, argv, "0123456789f:H:h:L:nN:Tt:x")) != -1) 158 switch (ch) { 159 case '0': case '1': case '2': case '3': case '4': 160 case '5': case '6': case '7': case '8': case '9': 161 /* 162 * kludge: last was originally designed to take 163 * a number after a dash. 164 */ 165 if (maxrec == -1) { 166 p = argv[optind - 1]; 167 if (p[0] == '-' && p[1] == ch && !p[2]) 168 maxrec = atol(++p); 169 else if (optind < argc) 170 maxrec = atol(argv[optind] + 1); 171 else 172 usage(); 173 if (!maxrec) 174 return 0; 175 } 176 break; 177 case 'f': 178 file = optarg; 179 if ('\0' == file[0]) 180 usage(); 181 break; 182 case 'H': 183 hostsize = atoi(optarg); 184 if (hostsize < 1) 185 usage(); 186 break; 187 case 'h': 188 hostconv(optarg); 189 addarg(HOST_TYPE, optarg); 190 break; 191 case 'L': 192 linesize = atoi(optarg); 193 if (linesize < 1) 194 usage(); 195 break; 196 case 'N': 197 namesize = atoi(optarg); 198 if (namesize < 1) 199 usage(); 200 break; 201 case 'n': 202 numeric = 1; 203 break; 204 case 'T': 205 fulltime = 1; 206 break; 207 case 't': 208 addarg(TTY_TYPE, ttyconv(optarg)); 209 break; 210 case 'x': 211 xflag = 1; 212 break; 213 case '?': 214 default: 215 usage(); 216 } 217 218 if (argc) { 219 setlinebuf(stdout); 220 for (argv += optind; *argv; ++argv) { 221 #define COMPATIBILITY 222 #ifdef COMPATIBILITY 223 /* code to allow "last p5" to work */ 224 addarg(TTY_TYPE, ttyconv(*argv)); 225 #endif 226 addarg(USER_TYPE, *argv); 227 } 228 } 229 if (file == NULL) { 230 #ifdef SUPPORT_UTMPX 231 if (access(_PATH_WTMPX, R_OK) == 0) 232 file = _PATH_WTMPX; 233 else 234 #endif 235 #ifdef SUPPORT_UTMP 236 if (access(_PATH_WTMP, R_OK) == 0) 237 file = _PATH_WTMP; 238 #endif 239 if (file == NULL) 240 #if defined(SUPPORT_UTMPX) && defined(SUPPORT_UTMP) 241 errx(EXIT_FAILURE, "Cannot access `%s' or `%s'", _PATH_WTMPX, 242 _PATH_WTMP); 243 #elif defined(SUPPORT_UTMPX) 244 errx(EXIT_FAILURE, "Cannot access `%s'", _PATH_WTMPX); 245 #elif defined(SUPPORT_UTMP) 246 errx(EXIT_FAILURE, "Cannot access `%s'", _PATH_WTMP); 247 #else 248 errx(EXIT_FAILURE, "No utmp or utmpx support compiled in."); 249 #endif 250 } 251 #if defined(SUPPORT_UTMPX) && defined(SUPPORT_UTMP) 252 if (file[strlen(file) - 1] == 'x' || xflag) 253 wtmpx(file, namesize, linesize, hostsize, numeric); 254 else 255 wtmp(file, namesize, linesize, hostsize, numeric); 256 #elif defined(SUPPORT_UTMPX) 257 wtmpx(file, namesize, linesize, hostsize, numeric); 258 #elif defined(SUPPORT_UTMP) 259 wtmp(file, namesize, linesize, hostsize, numeric); 260 #else 261 errx(EXIT_FAILURE, "No utmp or utmpx support compiled in."); 262 #endif 263 exit(EXIT_SUCCESS); 264 } 265 266 267 /* 268 * addarg -- 269 * add an entry to a linked list of arguments 270 */ 271 static void 272 addarg(int type, const char *arg) 273 { 274 ARG *cur; 275 276 if (!(cur = (ARG *)malloc(sizeof(ARG)))) 277 err(EXIT_FAILURE, "malloc failure"); 278 cur->next = arglist; 279 cur->type = type; 280 cur->name = arg; 281 arglist = cur; 282 } 283 284 /* 285 * addtty -- 286 * add an entry to a linked list of ttys 287 */ 288 static TTY * 289 addtty(const char *tty) 290 { 291 TTY *cur; 292 293 if (!(cur = (TTY *)malloc(sizeof(TTY)))) 294 err(EXIT_FAILURE, "malloc failure"); 295 cur->next = ttylist; 296 cur->logout = currentout; 297 memmove(cur->tty, tty, sizeof(cur->tty)); 298 return (ttylist = cur); 299 } 300 301 /* 302 * hostconv -- 303 * convert the hostname to search pattern; if the supplied host name 304 * has a domain attached that is the same as the current domain, rip 305 * off the domain suffix since that's what login(1) does. 306 */ 307 static void 308 hostconv(char *arg) 309 { 310 static int first = 1; 311 static char *hostdot, name[MAXHOSTNAMELEN + 1]; 312 char *argdot; 313 314 if (!(argdot = strchr(arg, '.'))) 315 return; 316 if (first) { 317 first = 0; 318 if (gethostname(name, sizeof(name))) 319 err(EXIT_FAILURE, "gethostname"); 320 name[sizeof(name) - 1] = '\0'; 321 hostdot = strchr(name, '.'); 322 } 323 if (hostdot && !strcasecmp(hostdot, argdot)) 324 *argdot = '\0'; 325 } 326 327 /* 328 * ttyconv -- 329 * convert tty to correct name. 330 */ 331 static const char * 332 ttyconv(char *arg) 333 { 334 char *mval; 335 336 if (!strcmp(arg, "co")) 337 return ("console"); 338 /* 339 * kludge -- we assume that all tty's end with 340 * a two character suffix. 341 */ 342 if (strlen(arg) == 2) { 343 if (asprintf(&mval, "tty%s", arg) == -1) 344 err(EXIT_FAILURE, "malloc failure"); 345 return (mval); 346 } 347 if (!strncmp(arg, _PATH_DEV, sizeof(_PATH_DEV) - 1)) 348 return (&arg[sizeof(_PATH_DEV) - 1]); 349 return (arg); 350 } 351 352 /* 353 * fmttime -- 354 * return pointer to (static) formatted time string. 355 */ 356 static char * 357 fmttime(time_t t, int flags) 358 { 359 struct tm *tm; 360 static char tbuf[TBUFLEN]; 361 362 tm = (flags & GMT) ? gmtime(&t) : localtime(&t); 363 if (tm == NULL) { 364 strcpy(tbuf, "????"); 365 return tbuf; 366 } 367 strftime(tbuf, sizeof(tbuf), 368 (flags & TIMEONLY) 369 ? (flags & FULLTIME ? LTFMTS : TFMTS) 370 : (flags & FULLTIME ? LTFMT : TFMT), 371 tm); 372 return (tbuf); 373 } 374 375 #ifdef SUPPORT_UTMP 376 #define TYPE(a) 0 377 #define NAMESIZE UT_NAMESIZE 378 #define LINESIZE UT_LINESIZE 379 #define HOSTSIZE UT_HOSTSIZE 380 #define ut_timefld ut_time 381 #define HAS_UT_SS 0 382 #include "want.c" 383 #undef TYPE /*(a)*/ 384 #undef NAMESIZE 385 #undef LINESIZE 386 #undef HOSTSIZE 387 #undef ut_timefld 388 #undef HAS_UT_SS 389 #endif 390 391 #ifdef SUPPORT_UTMPX 392 #define utmp utmpx 393 #define want wantx 394 #define wtmp wtmpx 395 #define gethost gethostx 396 #define buf bufx 397 #define onintr onintrx 398 #define TYPE(a) (a)->ut_type 399 #define NAMESIZE UTX_USERSIZE 400 #define LINESIZE UTX_LINESIZE 401 #define HOSTSIZE UTX_HOSTSIZE 402 #define ut_timefld ut_xtime 403 #define HAS_UT_SS 1 404 #include "want.c" 405 #endif 406
Indexes created Sat Sep 20 22:09:52 GMT 2025