1 /* $NetBSD: last.c,v 1.34 2010/06/05 03:24:01 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 1.34 2010/06/05 03:24:01 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 int main(int, char *[]); 117 118 static void addarg(int, const char *); 119 static TTY *addtty(const char *); 120 static void hostconv(char *); 121 static const char *ttyconv(char *); 122 #ifdef SUPPORT_UTMPX 123 static void wtmpx(const char *, int, int, int, int); 124 #endif 125 #ifdef SUPPORT_UTMP 126 static void wtmp(const char *, int, int, int, int); 127 #endif 128 static char *fmttime(time_t, int); 129 static void usage(void); 130 131 static 132 void usage(void) 133 { 134 (void)fprintf(stderr, "usage: %s [-#%s] [-nTx] [-f file]" 135 " [-H hostsize] [-h host] [-L linesize]\n" 136 "\t [-N namesize] [-t tty] [user ...]\n", getprogname(), 137 #ifdef NOTYET_SUPPORT_UTMPX 138 "w" 139 #else 140 "" 141 #endif 142 ); 143 exit(EXIT_FAILURE); 144 } 145 146 int 147 main(int argc, char *argv[]) 148 { 149 int ch; 150 char *p; 151 const char *file = NULL; 152 int namesize = UT_NAMESIZE; 153 int linesize = UT_LINESIZE; 154 int hostsize = UT_HOSTSIZE; 155 int numeric = 0; 156 157 maxrec = -1; 158 159 while ((ch = getopt(argc, argv, "0123456789f:H:h:L:nN:Tt:x")) != -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 if (optind < argc) 172 maxrec = atol(argv[optind] + 1); 173 else 174 usage(); 175 if (!maxrec) 176 return 0; 177 } 178 break; 179 case 'f': 180 file = optarg; 181 if ('\0' == file[0]) 182 usage(); 183 break; 184 case 'H': 185 hostsize = atoi(optarg); 186 if (hostsize < 1) 187 usage(); 188 break; 189 case 'h': 190 hostconv(optarg); 191 addarg(HOST_TYPE, optarg); 192 break; 193 case 'L': 194 linesize = atoi(optarg); 195 if (linesize < 1) 196 usage(); 197 break; 198 case 'N': 199 namesize = atoi(optarg); 200 if (namesize < 1) 201 usage(); 202 break; 203 case 'n': 204 numeric = 1; 205 break; 206 case 'T': 207 fulltime = 1; 208 break; 209 case 't': 210 addarg(TTY_TYPE, ttyconv(optarg)); 211 break; 212 case 'x': 213 xflag = 1; 214 break; 215 case '?': 216 default: 217 usage(); 218 } 219 220 if (argc) { 221 setlinebuf(stdout); 222 for (argv += optind; *argv; ++argv) { 223 #define COMPATIBILITY 224 #ifdef COMPATIBILITY 225 /* code to allow "last p5" to work */ 226 addarg(TTY_TYPE, ttyconv(*argv)); 227 #endif 228 addarg(USER_TYPE, *argv); 229 } 230 } 231 if (file == NULL) { 232 #ifdef SUPPORT_UTMPX 233 if (access(_PATH_WTMPX, R_OK) == 0) 234 file = _PATH_WTMPX; 235 else 236 #endif 237 #ifdef SUPPORT_UTMP 238 if (access(_PATH_WTMP, R_OK) == 0) 239 file = _PATH_WTMP; 240 #endif 241 if (file == NULL) 242 #if defined(SUPPORT_UTMPX) && defined(SUPPORT_UTMP) 243 errx(EXIT_FAILURE, "Cannot access `%s' or `%s'", _PATH_WTMPX, 244 _PATH_WTMP); 245 #elif defined(SUPPORT_UTMPX) 246 errx(EXIT_FAILURE, "Cannot access `%s'", _PATH_WTMPX); 247 #elif defined(SUPPORT_UTMP) 248 errx(EXIT_FAILURE, "Cannot access `%s'", _PATH_WTMP); 249 #else 250 errx(EXIT_FAILURE, "No utmp or utmpx support compiled in."); 251 #endif 252 } 253 #if defined(SUPPORT_UTMPX) && defined(SUPPORT_UTMP) 254 if (file[strlen(file) - 1] == 'x' || xflag) 255 wtmpx(file, namesize, linesize, hostsize, numeric); 256 else 257 wtmp(file, namesize, linesize, hostsize, numeric); 258 #elif defined(SUPPORT_UTMPX) 259 wtmpx(file, namesize, linesize, hostsize, numeric); 260 #elif defined(SUPPORT_UTMP) 261 wtmp(file, namesize, linesize, hostsize, numeric); 262 #else 263 errx(EXIT_FAILURE, "No utmp or utmpx support compiled in."); 264 #endif 265 exit(EXIT_SUCCESS); 266 } 267 268 269 /* 270 * addarg -- 271 * add an entry to a linked list of arguments 272 */ 273 static void 274 addarg(int type, const char *arg) 275 { 276 ARG *cur; 277 278 if (!(cur = (ARG *)malloc(sizeof(ARG)))) 279 err(EXIT_FAILURE, "malloc failure"); 280 cur->next = arglist; 281 cur->type = type; 282 cur->name = arg; 283 arglist = cur; 284 } 285 286 /* 287 * addtty -- 288 * add an entry to a linked list of ttys 289 */ 290 static TTY * 291 addtty(const char *tty) 292 { 293 TTY *cur; 294 295 if (!(cur = (TTY *)malloc(sizeof(TTY)))) 296 err(EXIT_FAILURE, "malloc failure"); 297 cur->next = ttylist; 298 cur->logout = currentout; 299 memmove(cur->tty, tty, sizeof(cur->tty)); 300 return (ttylist = cur); 301 } 302 303 /* 304 * hostconv -- 305 * convert the hostname to search pattern; if the supplied host name 306 * has a domain attached that is the same as the current domain, rip 307 * off the domain suffix since that's what login(1) does. 308 */ 309 static void 310 hostconv(char *arg) 311 { 312 static int first = 1; 313 static char *hostdot, name[MAXHOSTNAMELEN + 1]; 314 char *argdot; 315 316 if (!(argdot = strchr(arg, '.'))) 317 return; 318 if (first) { 319 first = 0; 320 if (gethostname(name, sizeof(name))) 321 err(EXIT_FAILURE, "gethostname"); 322 name[sizeof(name) - 1] = '\0'; 323 hostdot = strchr(name, '.'); 324 } 325 if (hostdot && !strcasecmp(hostdot, argdot)) 326 *argdot = '\0'; 327 } 328 329 /* 330 * ttyconv -- 331 * convert tty to correct name. 332 */ 333 static const char * 334 ttyconv(char *arg) 335 { 336 char *mval; 337 338 if (!strcmp(arg, "co")) 339 return ("console"); 340 /* 341 * kludge -- we assume that all tty's end with 342 * a two character suffix. 343 */ 344 if (strlen(arg) == 2) { 345 if (asprintf(&mval, "tty%s", arg) == -1) 346 err(EXIT_FAILURE, "malloc failure"); 347 return (mval); 348 } 349 if (!strncmp(arg, _PATH_DEV, sizeof(_PATH_DEV) - 1)) 350 return (&arg[sizeof(_PATH_DEV) - 1]); 351 return (arg); 352 } 353 354 /* 355 * fmttime -- 356 * return pointer to (static) formatted time string. 357 */ 358 static char * 359 fmttime(time_t t, int flags) 360 { 361 struct tm *tm; 362 static char tbuf[TBUFLEN]; 363 364 tm = (flags & GMT) ? gmtime(&t) : localtime(&t); 365 if (tm == NULL) { 366 strcpy(tbuf, "????"); 367 return tbuf; 368 } 369 strftime(tbuf, sizeof(tbuf), 370 (flags & TIMEONLY) 371 ? (flags & FULLTIME ? LTFMTS : TFMTS) 372 : (flags & FULLTIME ? LTFMT : TFMT), 373 tm); 374 return (tbuf); 375 } 376 377 #ifdef SUPPORT_UTMP 378 #define TYPE(a) 0 379 #define NAMESIZE UT_NAMESIZE 380 #define LINESIZE UT_LINESIZE 381 #define HOSTSIZE UT_HOSTSIZE 382 #define ut_timefld ut_time 383 #define FIRSTVALID 0 384 #include "want.c" 385 #undef TYPE /*(a)*/ 386 #undef NAMESIZE 387 #undef LINESIZE 388 #undef HOSTSIZE 389 #undef ut_timefld 390 #undef FIRSTVALID 391 #endif 392 393 #ifdef SUPPORT_UTMPX 394 #define utmp utmpx 395 #define want wantx 396 #define wtmp wtmpx 397 #define gethost gethostx 398 #define buf bufx 399 #define onintr onintrx 400 #define TYPE(a) (a)->ut_type 401 #define NAMESIZE UTX_USERSIZE 402 #define LINESIZE UTX_LINESIZE 403 #define HOSTSIZE UTX_HOSTSIZE 404 #define ut_timefld ut_xtime 405 #define FIRSTVALID 1 406 #include "want.c" 407 #endif 408