last.c revision 1.30
1 /* $NetBSD: last.c,v 1.30 2007/01/06 13:31:06 cbiere 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 1.30 2007/01/06 13:31:06 cbiere 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 <signal.h> 54 #include <stdio.h> 55 #include <stdlib.h> 56 #include <string.h> 57 #include <time.h> 58 #include <tzfile.h> 59 #include <unistd.h> 60 #include <arpa/inet.h> 61 #ifdef SUPPORT_UTMPX 62 #include <utmpx.h> 63 #endif 64 #ifdef SUPPORT_UTMP 65 #include <utmp.h> 66 #endif 67 #include <util.h> 68 69 #ifndef UT_NAMESIZE 70 #define UT_NAMESIZE 8 71 #define UT_LINESIZE 8 72 #define UT_HOSTSIZE 16 73 #endif 74 #ifndef SIGNATURE 75 #define SIGNATURE -1 76 #endif 77 78 79 80 #define NO 0 /* false/no */ 81 #define YES 1 /* true/yes */ 82 83 #define TBUFLEN 30 /* length of time string buffer */ 84 #define TFMT "%a %b %d %R" /* strftime format string */ 85 #define LTFMT "%a %b %d %Y %T" /* strftime long format string */ 86 #define TFMTS "%R" /* strftime format string - time only */ 87 #define LTFMTS "%T" /* strftime long format string - " */ 88 89 /* fmttime() flags */ 90 #define FULLTIME 0x1 /* show year, seconds */ 91 #define TIMEONLY 0x2 /* show time only, not date */ 92 #define GMT 0x4 /* show time at GMT, for offsets only */ 93 94 #define MAXUTMP 1024 95 96 typedef struct arg { 97 char *name; /* argument */ 98 #define HOST_TYPE -2 99 #define TTY_TYPE -3 100 #define USER_TYPE -4 101 int type; /* type of arg */ 102 struct arg *next; /* linked list pointer */ 103 } ARG; 104 static ARG *arglist; /* head of linked list */ 105 106 typedef struct ttytab { 107 time_t logout; /* log out time */ 108 char tty[128]; /* terminal name */ 109 struct ttytab *next; /* linked list pointer */ 110 } TTY; 111 static TTY *ttylist; /* head of linked list */ 112 113 static time_t currentout; /* current logout value */ 114 static long maxrec; /* records to display */ 115 static int fulltime = 0; /* Display seconds? */ 116 static int xflag; /* Assume file is wtmpx format */ 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, int); 126 #endif 127 #ifdef SUPPORT_UTMP 128 static void wtmp(const char *, int, 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] [-nTx] [-f file]" 137 " [-H hostsize] [-h host] [-L linesize]\n" 138 "\t [-N namesize] [-t tty] [user ...]\n", getprogname(), 139 #ifdef NOTYET_SUPPORT_UTMPX 140 "w" 141 #else 142 "" 143 #endif 144 ); 145 exit(EXIT_FAILURE); 146 } 147 148 int 149 main(int argc, char *argv[]) 150 { 151 int ch; 152 char *p; 153 char *file = NULL; 154 int namesize = UT_NAMESIZE; 155 int linesize = UT_LINESIZE; 156 int hostsize = UT_HOSTSIZE; 157 int numeric = 0; 158 159 maxrec = -1; 160 161 while ((ch = getopt(argc, argv, "0123456789f:H:h:L:nN:Tt:x")) != -1) 162 switch (ch) { 163 case '0': case '1': case '2': case '3': case '4': 164 case '5': case '6': case '7': case '8': case '9': 165 /* 166 * kludge: last was originally designed to take 167 * a number after a dash. 168 */ 169 if (maxrec == -1) { 170 p = argv[optind - 1]; 171 if (p[0] == '-' && p[1] == ch && !p[2]) 172 maxrec = atol(++p); 173 else if (optind < argc) 174 maxrec = atol(argv[optind] + 1); 175 else 176 usage(); 177 if (!maxrec) 178 return 0; 179 } 180 break; 181 case 'f': 182 file = optarg; 183 if ('\0' == file[0]) 184 usage(); 185 break; 186 case 'H': 187 hostsize = atoi(optarg); 188 if (hostsize < 1) 189 usage(); 190 break; 191 case 'h': 192 hostconv(optarg); 193 addarg(HOST_TYPE, optarg); 194 break; 195 case 'L': 196 linesize = atoi(optarg); 197 if (linesize < 1) 198 usage(); 199 break; 200 case 'N': 201 namesize = atoi(optarg); 202 if (namesize < 1) 203 usage(); 204 break; 205 case 'n': 206 numeric = 1; 207 break; 208 case 'T': 209 fulltime = 1; 210 break; 211 case 't': 212 addarg(TTY_TYPE, ttyconv(optarg)); 213 break; 214 case 'x': 215 xflag = 1; 216 break; 217 case '?': 218 default: 219 usage(); 220 } 221 222 if (argc) { 223 setlinebuf(stdout); 224 for (argv += optind; *argv; ++argv) { 225 #define COMPATIBILITY 226 #ifdef COMPATIBILITY 227 /* code to allow "last p5" to work */ 228 addarg(TTY_TYPE, ttyconv(*argv)); 229 #endif 230 addarg(USER_TYPE, *argv); 231 } 232 } 233 if (file == NULL) { 234 #ifdef SUPPORT_UTMPX 235 if (access(_PATH_WTMPX, R_OK) == 0) 236 file = _PATH_WTMPX; 237 else 238 #endif 239 #ifdef SUPPORT_UTMP 240 if (access(_PATH_WTMP, R_OK) == 0) 241 file = _PATH_WTMP; 242 #endif 243 if (file == NULL) 244 #if defined(SUPPORT_UTMPX) && defined(SUPPORT_UTMP) 245 errx(EXIT_FAILURE, "Cannot access `%s' or `%s'", _PATH_WTMPX, 246 _PATH_WTMP); 247 #elif defined(SUPPORT_UTMPX) 248 errx(EXIT_FAILURE, "Cannot access `%s'", _PATH_WTMPX); 249 #elif defined(SUPPORT_UTMP) 250 errx(EXIT_FAILURE, "Cannot access `%s'", _PATH_WTMP); 251 #else 252 errx(EXIT_FAILURE, "No utmp or utmpx support compiled in."); 253 #endif 254 } 255 #if defined(SUPPORT_UTMPX) && defined(SUPPORT_UTMP) 256 if (file[strlen(file) - 1] == 'x' || xflag) 257 wtmpx(file, namesize, linesize, hostsize, numeric); 258 else 259 wtmp(file, namesize, linesize, hostsize, numeric); 260 #elif defined(SUPPORT_UTMPX) 261 wtmpx(file, namesize, linesize, hostsize, numeric); 262 #elif defined(SUPPORT_UTMP) 263 wtmp(file, namesize, linesize, hostsize, numeric); 264 #else 265 errx(EXIT_FAILURE, "No utmp or utmpx support compiled in."); 266 #endif 267 exit(EXIT_SUCCESS); 268 } 269 270 271 /* 272 * addarg -- 273 * add an entry to a linked list of arguments 274 */ 275 static void 276 addarg(int type, char *arg) 277 { 278 ARG *cur; 279 280 if (!(cur = (ARG *)malloc(sizeof(ARG)))) 281 err(EXIT_FAILURE, "malloc failure"); 282 cur->next = arglist; 283 cur->type = type; 284 cur->name = arg; 285 arglist = cur; 286 } 287 288 /* 289 * addtty -- 290 * add an entry to a linked list of ttys 291 */ 292 static TTY * 293 addtty(const char *ttyname) 294 { 295 TTY *cur; 296 297 if (!(cur = (TTY *)malloc(sizeof(TTY)))) 298 err(EXIT_FAILURE, "malloc failure"); 299 cur->next = ttylist; 300 cur->logout = currentout; 301 memmove(cur->tty, ttyname, sizeof(cur->tty)); 302 return (ttylist = cur); 303 } 304 305 /* 306 * hostconv -- 307 * convert the hostname to search pattern; if the supplied host name 308 * has a domain attached that is the same as the current domain, rip 309 * off the domain suffix since that's what login(1) does. 310 */ 311 static void 312 hostconv(char *arg) 313 { 314 static int first = 1; 315 static char *hostdot, name[MAXHOSTNAMELEN + 1]; 316 char *argdot; 317 318 if (!(argdot = strchr(arg, '.'))) 319 return; 320 if (first) { 321 first = 0; 322 if (gethostname(name, sizeof(name))) 323 err(EXIT_FAILURE, "gethostname"); 324 name[sizeof(name) - 1] = '\0'; 325 hostdot = strchr(name, '.'); 326 } 327 if (hostdot && !strcasecmp(hostdot, argdot)) 328 *argdot = '\0'; 329 } 330 331 /* 332 * ttyconv -- 333 * convert tty to correct name. 334 */ 335 static char * 336 ttyconv(char *arg) 337 { 338 char *mval; 339 340 if (!strcmp(arg, "co")) 341 return ("console"); 342 /* 343 * kludge -- we assume that all tty's end with 344 * a two character suffix. 345 */ 346 if (strlen(arg) == 2) { 347 if (asprintf(&mval, "tty%s", arg) == -1) 348 err(EXIT_FAILURE, "malloc failure"); 349 return (mval); 350 } 351 if (!strncmp(arg, _PATH_DEV, sizeof(_PATH_DEV) - 1)) 352 return (&arg[sizeof(_PATH_DEV) - 1]); 353 return (arg); 354 } 355 356 /* 357 * fmttime -- 358 * return pointer to (static) formatted time string. 359 */ 360 static char * 361 fmttime(time_t t, int flags) 362 { 363 struct tm *tm; 364 static char tbuf[TBUFLEN]; 365 366 tm = (flags & GMT) ? gmtime(&t) : localtime(&t); 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 FIRSTVALID 0 382 #include "want.c" 383 #undef TYPE /*(a)*/ 384 #undef NAMESIZE 385 #undef LINESIZE 386 #undef HOSTSIZE 387 #undef ut_timefld 388 #undef FIRSTVALID 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 FIRSTVALID 1 404 #include "want.c" 405 #endif 406
Indexes created Tue Sep 30 20:09:53 GMT 2025