last.c revision 1.27
1 /* $NetBSD: last.c,v 1.27 2005/03/14 13:34:57 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 1.27 2005/03/14 13:34:57 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 173 maxrec = atol(argv[optind] + 1); 174 if (!maxrec) 175 exit(0); 176 } 177 break; 178 case 'f': 179 file = optarg; 180 break; 181 case 'H': 182 hostsize = atoi(optarg); 183 break; 184 case 'h': 185 hostconv(optarg); 186 addarg(HOST_TYPE, optarg); 187 break; 188 case 'L': 189 linesize = atoi(optarg); 190 break; 191 case 'N': 192 namesize = atoi(optarg); 193 break; 194 case 'n': 195 numeric = 1; 196 break; 197 case 'T': 198 fulltime = 1; 199 break; 200 case 't': 201 addarg(TTY_TYPE, ttyconv(optarg)); 202 break; 203 case 'x': 204 xflag = 1; 205 break; 206 case '?': 207 default: 208 usage(); 209 } 210 211 if (argc) { 212 setlinebuf(stdout); 213 for (argv += optind; *argv; ++argv) { 214 #define COMPATIBILITY 215 #ifdef COMPATIBILITY 216 /* code to allow "last p5" to work */ 217 addarg(TTY_TYPE, ttyconv(*argv)); 218 #endif 219 addarg(USER_TYPE, *argv); 220 } 221 } 222 if (file == NULL) { 223 #ifdef SUPPORT_UTMPX 224 if (access(_PATH_WTMPX, R_OK) == 0) 225 file = _PATH_WTMPX; 226 else 227 #endif 228 #ifdef SUPPORT_UTMP 229 if (access(_PATH_WTMP, R_OK) == 0) 230 file = _PATH_WTMP; 231 #endif 232 if (file == NULL) 233 #if defined(SUPPORT_UTMPX) && defined(SUPPORT_UTMP) 234 errx(1, "Cannot access `%s' or `%s'", _PATH_WTMPX, 235 _PATH_WTMP); 236 #elif defined(SUPPORT_UTMPX) 237 errx(1, "Cannot access `%s'", _PATH_WTMPX); 238 #elif defined(SUPPORT_UTMP) 239 errx(1, "Cannot access `%s'", _PATH_WTMP); 240 #else 241 errx(1, "No utmp or utmpx support compiled in."); 242 #endif 243 } 244 #if defined(SUPPORT_UTMPX) && defined(SUPPORT_UTMP) 245 if (file[strlen(file) - 1] == 'x' || xflag) 246 wtmpx(file, namesize, linesize, hostsize, numeric); 247 else 248 wtmp(file, namesize, linesize, hostsize, numeric); 249 #elif defined(SUPPORT_UTMPX) 250 wtmpx(file, namesize, linesize, hostsize, numeric); 251 #elif defined(SUPPORT_UTMP) 252 wtmp(file, namesize, linesize, hostsize, numeric); 253 #else 254 errx(1, "No utmp or utmpx support compiled in."); 255 #endif 256 exit(0); 257 } 258 259 260 /* 261 * addarg -- 262 * add an entry to a linked list of arguments 263 */ 264 static void 265 addarg(int type, char *arg) 266 { 267 ARG *cur; 268 269 if (!(cur = (ARG *)malloc((u_int)sizeof(ARG)))) 270 err(1, "malloc failure"); 271 cur->next = arglist; 272 cur->type = type; 273 cur->name = arg; 274 arglist = cur; 275 } 276 277 /* 278 * addtty -- 279 * add an entry to a linked list of ttys 280 */ 281 static TTY * 282 addtty(const char *ttyname) 283 { 284 TTY *cur; 285 286 if (!(cur = (TTY *)malloc((u_int)sizeof(TTY)))) 287 err(1, "malloc failure"); 288 cur->next = ttylist; 289 cur->logout = currentout; 290 memmove(cur->tty, ttyname, sizeof(cur->tty)); 291 return (ttylist = cur); 292 } 293 294 /* 295 * hostconv -- 296 * convert the hostname to search pattern; if the supplied host name 297 * has a domain attached that is the same as the current domain, rip 298 * off the domain suffix since that's what login(1) does. 299 */ 300 static void 301 hostconv(char *arg) 302 { 303 static int first = 1; 304 static char *hostdot, name[MAXHOSTNAMELEN + 1]; 305 char *argdot; 306 307 if (!(argdot = strchr(arg, '.'))) 308 return; 309 if (first) { 310 first = 0; 311 if (gethostname(name, sizeof(name))) 312 err(1, "gethostname"); 313 name[sizeof(name) - 1] = '\0'; 314 hostdot = strchr(name, '.'); 315 } 316 if (hostdot && !strcasecmp(hostdot, argdot)) 317 *argdot = '\0'; 318 } 319 320 /* 321 * ttyconv -- 322 * convert tty to correct name. 323 */ 324 static char * 325 ttyconv(char *arg) 326 { 327 char *mval; 328 329 /* 330 * kludge -- we assume that all tty's end with 331 * a two character suffix. 332 */ 333 if (strlen(arg) == 2) { 334 if (!strcmp(arg, "co")) 335 mval = strdup("console"); 336 else 337 asprintf(&mval, "tty%s", arg); 338 if (!mval) 339 err(1, "malloc failure"); 340 return (mval); 341 } 342 if (!strncmp(arg, _PATH_DEV, sizeof(_PATH_DEV) - 1)) 343 return (arg + 5); 344 return (arg); 345 } 346 347 /* 348 * fmttime -- 349 * return pointer to (static) formatted time string. 350 */ 351 static char * 352 fmttime(time_t t, int flags) 353 { 354 struct tm *tm; 355 static char tbuf[TBUFLEN]; 356 357 tm = (flags & GMT) ? gmtime(&t) : localtime(&t); 358 strftime(tbuf, sizeof(tbuf), 359 (flags & TIMEONLY) 360 ? (flags & FULLTIME ? LTFMTS : TFMTS) 361 : (flags & FULLTIME ? LTFMT : TFMT), 362 tm); 363 return (tbuf); 364 } 365 366 #ifdef SUPPORT_UTMP 367 #define TYPE(a) 0 368 #define NAMESIZE UT_NAMESIZE 369 #define LINESIZE UT_LINESIZE 370 #define HOSTSIZE UT_HOSTSIZE 371 #define ut_timefld ut_time 372 #define FIRSTVALID 0 373 #include "want.c" 374 #undef TYPE /*(a)*/ 375 #undef NAMESIZE 376 #undef LINESIZE 377 #undef HOSTSIZE 378 #undef ut_timefld 379 #undef FIRSTVALID 380 #endif 381 382 #ifdef SUPPORT_UTMPX 383 #define utmp utmpx 384 #define want wantx 385 #define wtmp wtmpx 386 #define gethost gethostx 387 #define buf bufx 388 #define onintr onintrx 389 #define TYPE(a) (a)->ut_type 390 #define NAMESIZE UTX_USERSIZE 391 #define LINESIZE UTX_LINESIZE 392 #define HOSTSIZE UTX_HOSTSIZE 393 #define ut_timefld ut_xtime 394 #define FIRSTVALID 1 395 #include "want.c" 396 #endif 397
Indexes created Tue Sep 30 17:09:57 GMT 2025