last.c revision 1.29
1 /* $NetBSD: last.c,v 1.29 2006/01/22 15:47:10 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. 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 1.29 2006/01/22 15:47:10 christos Exp $"); 44 #endif /* not lint */ 45 46 #include <sys/param.h> 47 #include <sys/stat.h> 48 49 #include <err.h> 50 #include <fcntl.h> 51 #include <paths.h> 52 #include <signal.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(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 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 break; 183 case 'H': 184 hostsize = atoi(optarg); 185 break; 186 case 'h': 187 hostconv(optarg); 188 addarg(HOST_TYPE, optarg); 189 break; 190 case 'L': 191 linesize = atoi(optarg); 192 break; 193 case 'N': 194 namesize = atoi(optarg); 195 break; 196 case 'n': 197 numeric = 1; 198 break; 199 case 'T': 200 fulltime = 1; 201 break; 202 case 't': 203 addarg(TTY_TYPE, ttyconv(optarg)); 204 break; 205 case 'x': 206 xflag = 1; 207 break; 208 case '?': 209 default: 210 usage(); 211 } 212 213 if (argc) { 214 setlinebuf(stdout); 215 for (argv += optind; *argv; ++argv) { 216 #define COMPATIBILITY 217 #ifdef COMPATIBILITY 218 /* code to allow "last p5" to work */ 219 addarg(TTY_TYPE, ttyconv(*argv)); 220 #endif 221 addarg(USER_TYPE, *argv); 222 } 223 } 224 if (file == NULL) { 225 #ifdef SUPPORT_UTMPX 226 if (access(_PATH_WTMPX, R_OK) == 0) 227 file = _PATH_WTMPX; 228 else 229 #endif 230 #ifdef SUPPORT_UTMP 231 if (access(_PATH_WTMP, R_OK) == 0) 232 file = _PATH_WTMP; 233 #endif 234 if (file == NULL) 235 #if defined(SUPPORT_UTMPX) && defined(SUPPORT_UTMP) 236 errx(1, "Cannot access `%s' or `%s'", _PATH_WTMPX, 237 _PATH_WTMP); 238 #elif defined(SUPPORT_UTMPX) 239 errx(1, "Cannot access `%s'", _PATH_WTMPX); 240 #elif defined(SUPPORT_UTMP) 241 errx(1, "Cannot access `%s'", _PATH_WTMP); 242 #else 243 errx(1, "No utmp or utmpx support compiled in."); 244 #endif 245 } 246 #if defined(SUPPORT_UTMPX) && defined(SUPPORT_UTMP) 247 if (file[strlen(file) - 1] == 'x' || xflag) 248 wtmpx(file, namesize, linesize, hostsize, numeric); 249 else 250 wtmp(file, namesize, linesize, hostsize, numeric); 251 #elif defined(SUPPORT_UTMPX) 252 wtmpx(file, namesize, linesize, hostsize, numeric); 253 #elif defined(SUPPORT_UTMP) 254 wtmp(file, namesize, linesize, hostsize, numeric); 255 #else 256 errx(1, "No utmp or utmpx support compiled in."); 257 #endif 258 exit(0); 259 } 260 261 262 /* 263 * addarg -- 264 * add an entry to a linked list of arguments 265 */ 266 static void 267 addarg(int type, char *arg) 268 { 269 ARG *cur; 270 271 if (!(cur = (ARG *)malloc((u_int)sizeof(ARG)))) 272 err(1, "malloc failure"); 273 cur->next = arglist; 274 cur->type = type; 275 cur->name = arg; 276 arglist = cur; 277 } 278 279 /* 280 * addtty -- 281 * add an entry to a linked list of ttys 282 */ 283 static TTY * 284 addtty(const char *ttyname) 285 { 286 TTY *cur; 287 288 if (!(cur = (TTY *)malloc((u_int)sizeof(TTY)))) 289 err(1, "malloc failure"); 290 cur->next = ttylist; 291 cur->logout = currentout; 292 memmove(cur->tty, ttyname, sizeof(cur->tty)); 293 return (ttylist = cur); 294 } 295 296 /* 297 * hostconv -- 298 * convert the hostname to search pattern; if the supplied host name 299 * has a domain attached that is the same as the current domain, rip 300 * off the domain suffix since that's what login(1) does. 301 */ 302 static void 303 hostconv(char *arg) 304 { 305 static int first = 1; 306 static char *hostdot, name[MAXHOSTNAMELEN + 1]; 307 char *argdot; 308 309 if (!(argdot = strchr(arg, '.'))) 310 return; 311 if (first) { 312 first = 0; 313 if (gethostname(name, sizeof(name))) 314 err(1, "gethostname"); 315 name[sizeof(name) - 1] = '\0'; 316 hostdot = strchr(name, '.'); 317 } 318 if (hostdot && !strcasecmp(hostdot, argdot)) 319 *argdot = '\0'; 320 } 321 322 /* 323 * ttyconv -- 324 * convert tty to correct name. 325 */ 326 static char * 327 ttyconv(char *arg) 328 { 329 char *mval; 330 331 /* 332 * kludge -- we assume that all tty's end with 333 * a two character suffix. 334 */ 335 if (strlen(arg) == 2) { 336 if (!strcmp(arg, "co")) 337 mval = strdup("console"); 338 else 339 asprintf(&mval, "tty%s", arg); 340 if (!mval) 341 err(1, "malloc failure"); 342 return (mval); 343 } 344 if (!strncmp(arg, _PATH_DEV, sizeof(_PATH_DEV) - 1)) 345 return (arg + 5); 346 return (arg); 347 } 348 349 /* 350 * fmttime -- 351 * return pointer to (static) formatted time string. 352 */ 353 static char * 354 fmttime(time_t t, int flags) 355 { 356 struct tm *tm; 357 static char tbuf[TBUFLEN]; 358 359 tm = (flags & GMT) ? gmtime(&t) : localtime(&t); 360 strftime(tbuf, sizeof(tbuf), 361 (flags & TIMEONLY) 362 ? (flags & FULLTIME ? LTFMTS : TFMTS) 363 : (flags & FULLTIME ? LTFMT : TFMT), 364 tm); 365 return (tbuf); 366 } 367 368 #ifdef SUPPORT_UTMP 369 #define TYPE(a) 0 370 #define NAMESIZE UT_NAMESIZE 371 #define LINESIZE UT_LINESIZE 372 #define HOSTSIZE UT_HOSTSIZE 373 #define ut_timefld ut_time 374 #define FIRSTVALID 0 375 #include "want.c" 376 #undef TYPE /*(a)*/ 377 #undef NAMESIZE 378 #undef LINESIZE 379 #undef HOSTSIZE 380 #undef ut_timefld 381 #undef FIRSTVALID 382 #endif 383 384 #ifdef SUPPORT_UTMPX 385 #define utmp utmpx 386 #define want wantx 387 #define wtmp wtmpx 388 #define gethost gethostx 389 #define buf bufx 390 #define onintr onintrx 391 #define TYPE(a) (a)->ut_type 392 #define NAMESIZE UTX_USERSIZE 393 #define LINESIZE UTX_LINESIZE 394 #define HOSTSIZE UTX_HOSTSIZE 395 #define ut_timefld ut_xtime 396 #define FIRSTVALID 1 397 #include "want.c" 398 #endif 399
Indexes created Mon Sep 29 21:09:56 GMT 2025