last.c revision 1.31
1 /* $NetBSD: last.c,v 1.31 2007/10/05 07:27:42 lukem 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( 35 "@(#) Copyright (c) 1987, 1993, 1994\n\ 36 The Regents of the University of California. All rights reserved.\n"); 37 #endif /* not lint */ 38 39 #ifndef lint 40 #if 0 41 static char sccsid[] = "@(#)last.c 8.2 (Berkeley) 4/2/94"; 42 #endif 43 __RCSID("$NetBSD: last.c,v 1.31 2007/10/05 07:27:42 lukem Exp $"); 44 #endif /* not lint */ 45 46 #include <sys/param.h> 47 #include <sys/stat.h> 48 49 #include <err.h> 50 #include <errno.h> 51 #include <fcntl.h> 52 #include <paths.h> 53 #include <stdio.h> 54 #include <stdlib.h> 55 #include <string.h> 56 #include <time.h> 57 #include <tzfile.h> 58 #include <unistd.h> 59 #include <arpa/inet.h> 60 #ifdef SUPPORT_UTMPX 61 #include <utmpx.h> 62 #endif 63 #ifdef SUPPORT_UTMP 64 #include <utmp.h> 65 #endif 66 #include <util.h> 67 68 #ifndef UT_NAMESIZE 69 #define UT_NAMESIZE 8 70 #define UT_LINESIZE 8 71 #define UT_HOSTSIZE 16 72 #endif 73 #ifndef SIGNATURE 74 #define SIGNATURE -1 75 #endif 76 77 78 79 #define NO 0 /* false/no */ 80 #define YES 1 /* true/yes */ 81 82 #define TBUFLEN 30 /* length of time string buffer */ 83 #define TFMT "%a %b %d %R" /* strftime format string */ 84 #define LTFMT "%a %b %d %Y %T" /* strftime long format string */ 85 #define TFMTS "%R" /* strftime format string - time only */ 86 #define LTFMTS "%T" /* strftime long format string - " */ 87 88 /* fmttime() flags */ 89 #define FULLTIME 0x1 /* show year, seconds */ 90 #define TIMEONLY 0x2 /* show time only, not date */ 91 #define GMT 0x4 /* show time at GMT, for offsets only */ 92 93 #define MAXUTMP 1024 94 95 typedef struct arg { 96 char *name; /* argument */ 97 #define HOST_TYPE -2 98 #define TTY_TYPE -3 99 #define USER_TYPE -4 100 int type; /* type of arg */ 101 struct arg *next; /* linked list pointer */ 102 } ARG; 103 static ARG *arglist; /* head of linked list */ 104 105 typedef struct ttytab { 106 time_t logout; /* log out time */ 107 char tty[128]; /* terminal name */ 108 struct ttytab *next; /* linked list pointer */ 109 } TTY; 110 static TTY *ttylist; /* head of linked list */ 111 112 static time_t currentout; /* current logout value */ 113 static long maxrec; /* records to display */ 114 static int fulltime = 0; /* Display seconds? */ 115 static int xflag; /* Assume file is wtmpx format */ 116 117 int main(int, char *[]); 118 119 static void addarg(int, char *); 120 static TTY *addtty(const char *); 121 static void hostconv(char *); 122 static char *ttyconv(char *); 123 #ifdef SUPPORT_UTMPX 124 static void wtmpx(const char *, int, int, int, int); 125 #endif 126 #ifdef SUPPORT_UTMP 127 static void wtmp(const char *, int, int, int, int); 128 #endif 129 static char *fmttime(time_t, int); 130 static void usage(void); 131 132 static 133 void usage(void) 134 { 135 (void)fprintf(stderr, "usage: %s [-#%s] [-nTx] [-f file]" 136 " [-H hostsize] [-h host] [-L linesize]\n" 137 "\t [-N namesize] [-t tty] [user ...]\n", getprogname(), 138 #ifdef NOTYET_SUPPORT_UTMPX 139 "w" 140 #else 141 "" 142 #endif 143 ); 144 exit(EXIT_FAILURE); 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 int numeric = 0; 157 158 maxrec = -1; 159 160 while ((ch = getopt(argc, argv, "0123456789f:H:h:L:nN:Tt:x")) != -1) 161 switch (ch) { 162 case '0': case '1': case '2': case '3': case '4': 163 case '5': case '6': case '7': case '8': case '9': 164 /* 165 * kludge: last was originally designed to take 166 * a number after a dash. 167 */ 168 if (maxrec == -1) { 169 p = argv[optind - 1]; 170 if (p[0] == '-' && p[1] == ch && !p[2]) 171 maxrec = atol(++p); 172 else if (optind < argc) 173 maxrec = atol(argv[optind] + 1); 174 else 175 usage(); 176 if (!maxrec) 177 return 0; 178 } 179 break; 180 case 'f': 181 file = optarg; 182 if ('\0' == file[0]) 183 usage(); 184 break; 185 case 'H': 186 hostsize = atoi(optarg); 187 if (hostsize < 1) 188 usage(); 189 break; 190 case 'h': 191 hostconv(optarg); 192 addarg(HOST_TYPE, optarg); 193 break; 194 case 'L': 195 linesize = atoi(optarg); 196 if (linesize < 1) 197 usage(); 198 break; 199 case 'N': 200 namesize = atoi(optarg); 201 if (namesize < 1) 202 usage(); 203 break; 204 case 'n': 205 numeric = 1; 206 break; 207 case 'T': 208 fulltime = 1; 209 break; 210 case 't': 211 addarg(TTY_TYPE, ttyconv(optarg)); 212 break; 213 case 'x': 214 xflag = 1; 215 break; 216 case '?': 217 default: 218 usage(); 219 } 220 221 if (argc) { 222 setlinebuf(stdout); 223 for (argv += optind; *argv; ++argv) { 224 #define COMPATIBILITY 225 #ifdef COMPATIBILITY 226 /* code to allow "last p5" to work */ 227 addarg(TTY_TYPE, ttyconv(*argv)); 228 #endif 229 addarg(USER_TYPE, *argv); 230 } 231 } 232 if (file == NULL) { 233 #ifdef SUPPORT_UTMPX 234 if (access(_PATH_WTMPX, R_OK) == 0) 235 file = _PATH_WTMPX; 236 else 237 #endif 238 #ifdef SUPPORT_UTMP 239 if (access(_PATH_WTMP, R_OK) == 0) 240 file = _PATH_WTMP; 241 #endif 242 if (file == NULL) 243 #if defined(SUPPORT_UTMPX) && defined(SUPPORT_UTMP) 244 errx(EXIT_FAILURE, "Cannot access `%s' or `%s'", _PATH_WTMPX, 245 _PATH_WTMP); 246 #elif defined(SUPPORT_UTMPX) 247 errx(EXIT_FAILURE, "Cannot access `%s'", _PATH_WTMPX); 248 #elif defined(SUPPORT_UTMP) 249 errx(EXIT_FAILURE, "Cannot access `%s'", _PATH_WTMP); 250 #else 251 errx(EXIT_FAILURE, "No utmp or utmpx support compiled in."); 252 #endif 253 } 254 #if defined(SUPPORT_UTMPX) && defined(SUPPORT_UTMP) 255 if (file[strlen(file) - 1] == 'x' || xflag) 256 wtmpx(file, namesize, linesize, hostsize, numeric); 257 else 258 wtmp(file, namesize, linesize, hostsize, numeric); 259 #elif defined(SUPPORT_UTMPX) 260 wtmpx(file, namesize, linesize, hostsize, numeric); 261 #elif defined(SUPPORT_UTMP) 262 wtmp(file, namesize, linesize, hostsize, numeric); 263 #else 264 errx(EXIT_FAILURE, "No utmp or utmpx support compiled in."); 265 #endif 266 exit(EXIT_SUCCESS); 267 } 268 269 270 /* 271 * addarg -- 272 * add an entry to a linked list of arguments 273 */ 274 static void 275 addarg(int type, char *arg) 276 { 277 ARG *cur; 278 279 if (!(cur = (ARG *)malloc(sizeof(ARG)))) 280 err(EXIT_FAILURE, "malloc failure"); 281 cur->next = arglist; 282 cur->type = type; 283 cur->name = arg; 284 arglist = cur; 285 } 286 287 /* 288 * addtty -- 289 * add an entry to a linked list of ttys 290 */ 291 static TTY * 292 addtty(const char *ttyname) 293 { 294 TTY *cur; 295 296 if (!(cur = (TTY *)malloc(sizeof(TTY)))) 297 err(EXIT_FAILURE, "malloc failure"); 298 cur->next = ttylist; 299 cur->logout = currentout; 300 memmove(cur->tty, ttyname, sizeof(cur->tty)); 301 return (ttylist = cur); 302 } 303 304 /* 305 * hostconv -- 306 * convert the hostname to search pattern; if the supplied host name 307 * has a domain attached that is the same as the current domain, rip 308 * off the domain suffix since that's what login(1) does. 309 */ 310 static void 311 hostconv(char *arg) 312 { 313 static int first = 1; 314 static char *hostdot, name[MAXHOSTNAMELEN + 1]; 315 char *argdot; 316 317 if (!(argdot = strchr(arg, '.'))) 318 return; 319 if (first) { 320 first = 0; 321 if (gethostname(name, sizeof(name))) 322 err(EXIT_FAILURE, "gethostname"); 323 name[sizeof(name) - 1] = '\0'; 324 hostdot = strchr(name, '.'); 325 } 326 if (hostdot && !strcasecmp(hostdot, argdot)) 327 *argdot = '\0'; 328 } 329 330 /* 331 * ttyconv -- 332 * convert tty to correct name. 333 */ 334 static char * 335 ttyconv(char *arg) 336 { 337 char *mval; 338 339 if (!strcmp(arg, "co")) 340 return ("console"); 341 /* 342 * kludge -- we assume that all tty's end with 343 * a two character suffix. 344 */ 345 if (strlen(arg) == 2) { 346 if (asprintf(&mval, "tty%s", arg) == -1) 347 err(EXIT_FAILURE, "malloc failure"); 348 return (mval); 349 } 350 if (!strncmp(arg, _PATH_DEV, sizeof(_PATH_DEV) - 1)) 351 return (&arg[sizeof(_PATH_DEV) - 1]); 352 return (arg); 353 } 354 355 /* 356 * fmttime -- 357 * return pointer to (static) formatted time string. 358 */ 359 static char * 360 fmttime(time_t t, int flags) 361 { 362 struct tm *tm; 363 static char tbuf[TBUFLEN]; 364 365 tm = (flags & GMT) ? gmtime(&t) : localtime(&t); 366 strftime(tbuf, sizeof(tbuf), 367 (flags & TIMEONLY) 368 ? (flags & FULLTIME ? LTFMTS : TFMTS) 369 : (flags & FULLTIME ? LTFMT : TFMT), 370 tm); 371 return (tbuf); 372 } 373 374 #ifdef SUPPORT_UTMP 375 #define TYPE(a) 0 376 #define NAMESIZE UT_NAMESIZE 377 #define LINESIZE UT_LINESIZE 378 #define HOSTSIZE UT_HOSTSIZE 379 #define ut_timefld ut_time 380 #define FIRSTVALID 0 381 #include "want.c" 382 #undef TYPE /*(a)*/ 383 #undef NAMESIZE 384 #undef LINESIZE 385 #undef HOSTSIZE 386 #undef ut_timefld 387 #undef FIRSTVALID 388 #endif 389 390 #ifdef SUPPORT_UTMPX 391 #define utmp utmpx 392 #define want wantx 393 #define wtmp wtmpx 394 #define gethost gethostx 395 #define buf bufx 396 #define onintr onintrx 397 #define TYPE(a) (a)->ut_type 398 #define NAMESIZE UTX_USERSIZE 399 #define LINESIZE UTX_LINESIZE 400 #define HOSTSIZE UTX_HOSTSIZE 401 #define ut_timefld ut_xtime 402 #define FIRSTVALID 1 403 #include "want.c" 404 #endif 405
Indexes created Tue Oct 28 12:10:06 GMT 2025