last.c revision 1.19
1 /* $NetBSD: last.c,v 1.19 2003/07/07 11:42:13 wiz 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. All advertising materials mentioning features or use of this software 16 * must display the following acknowledgement: 17 * This product includes software developed by the University of 18 * California, Berkeley and its contributors. 19 * 4. Neither the name of the University nor the names of its contributors 20 * may be used to endorse or promote products derived from this software 21 * without specific prior written permission. 22 * 23 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 24 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 25 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 26 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 27 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 28 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 29 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 30 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 31 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 32 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 33 * SUCH DAMAGE. 34 */ 35 36 #include <sys/cdefs.h> 37 #ifndef lint 38 __COPYRIGHT( 39 "@(#) Copyright (c) 1987, 1993, 1994\n\ 40 The Regents of the University of California. All rights reserved.\n"); 41 #endif /* not lint */ 42 43 #ifndef lint 44 #if 0 45 static char sccsid[] = "@(#)last.c 8.2 (Berkeley) 4/2/94"; 46 #endif 47 __RCSID("$NetBSD: last.c,v 1.19 2003/07/07 11:42:13 wiz Exp $"); 48 #endif /* not lint */ 49 50 #include <sys/param.h> 51 #include <sys/stat.h> 52 53 #include <err.h> 54 #include <fcntl.h> 55 #include <paths.h> 56 #include <signal.h> 57 #include <stdio.h> 58 #include <stdlib.h> 59 #include <string.h> 60 #include <time.h> 61 #include <tzfile.h> 62 #include <unistd.h> 63 #ifdef SUPPORT_UTMPX 64 #include <utmpx.h> 65 #endif 66 #ifdef SUPPORT_UTMP 67 #include <utmp.h> 68 #endif 69 70 #ifndef UT_NAMESIZE 71 #define UT_NAMESIZE 8 72 #define UT_LINESIZE 8 73 #define UT_HOSTSIZE 16 74 #endif 75 #ifndef SIGNATURE 76 #define SIGNATURE -1 77 #endif 78 79 80 81 #define NO 0 /* false/no */ 82 #define YES 1 /* true/yes */ 83 84 #define TBUFLEN 30 /* length of time string buffer */ 85 #define TFMT "%a %b %d %R" /* strftime format string */ 86 #define LTFMT "%a %b %d %Y %T" /* strftime long format string */ 87 #define TFMTS "%R" /* strftime format string - time only */ 88 #define LTFMTS "%T" /* strftime long format string - " */ 89 90 /* fmttime() flags */ 91 #define FULLTIME 0x1 /* show year, seconds */ 92 #define TIMEONLY 0x2 /* show time only, not date */ 93 #define GMT 0x4 /* show time at GMT, for offsets only */ 94 95 #define MAXUTMP 1024; 96 97 typedef struct arg { 98 char *name; /* argument */ 99 #define HOST_TYPE -2 100 #define TTY_TYPE -3 101 #define USER_TYPE -4 102 int type; /* type of arg */ 103 struct arg *next; /* linked list pointer */ 104 } ARG; 105 static ARG *arglist; /* head of linked list */ 106 107 typedef struct ttytab { 108 time_t logout; /* log out time */ 109 char tty[128]; /* terminal name */ 110 struct ttytab *next; /* linked list pointer */ 111 } TTY; 112 static TTY *ttylist; /* head of linked list */ 113 114 static time_t currentout; /* current logout value */ 115 static long maxrec; /* records to display */ 116 static int fulltime = 0; /* Display seconds? */ 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); 126 #endif 127 #ifdef SUPPORT_UTMP 128 static void wtmp(const char *, 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] [-T] [-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(1); 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; 157 158 maxrec = -1; 159 160 while ((ch = getopt(argc, argv, "0123456789f:H:h:L:N:Tt:")) != -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 'T': 195 fulltime = 1; 196 break; 197 case 't': 198 addarg(TTY_TYPE, ttyconv(optarg)); 199 break; 200 case '?': 201 default: 202 usage(); 203 } 204 205 if (argc) { 206 setlinebuf(stdout); 207 for (argv += optind; *argv; ++argv) { 208 #define COMPATIBILITY 209 #ifdef COMPATIBILITY 210 /* code to allow "last p5" to work */ 211 addarg(TTY_TYPE, ttyconv(*argv)); 212 #endif 213 addarg(USER_TYPE, *argv); 214 } 215 } 216 if (file == NULL) { 217 #ifdef SUPPORT_UTMPX 218 if (access(_PATH_WTMPX, R_OK) == 0) 219 file = _PATH_WTMPX; 220 else 221 #endif 222 #ifdef SUPPORT_UTMP 223 if (access(_PATH_WTMP, R_OK) == 0) 224 file = _PATH_WTMP; 225 #endif 226 if (file == NULL) 227 #if defined(SUPPORT_UTMPX) && defined(SUPPORT_UTMP) 228 errx(1, "Cannot access `%s' or `%s'", _PATH_WTMPX, 229 _PATH_WTMP); 230 #elif defined(SUPPORT_UTMPX) 231 errx(1, "Cannot access `%s'", _PATH_WTMPX); 232 #elif defined(SUPPORT_UTMP) 233 errx(1, "Cannot access `%s'", _PATH_WTMP); 234 #else 235 errx(1, "No utmp or utmpx support compiled in."); 236 #endif 237 } 238 #if defined(SUPPORT_UTMPX) && defined(SUPPORT_UTMP) 239 if (file[strlen(file) - 1] == 'x') 240 wtmpx(file, namesize, linesize, hostsize); 241 else 242 wtmp(file, namesize, linesize, hostsize); 243 #elif defined(SUPPORT_UTMPX) 244 wtmpx(file, namesize, linesize, hostsize); 245 #elif defined(SUPPORT_UTMP) 246 wtmp(file, namesize, linesize, hostsize); 247 #else 248 errx(1, "No utmp or utmpx support compiled in."); 249 #endif 250 exit(0); 251 } 252 253 254 /* 255 * addarg -- 256 * add an entry to a linked list of arguments 257 */ 258 static void 259 addarg(int type, char *arg) 260 { 261 ARG *cur; 262 263 if (!(cur = (ARG *)malloc((u_int)sizeof(ARG)))) 264 err(1, "malloc failure"); 265 cur->next = arglist; 266 cur->type = type; 267 cur->name = arg; 268 arglist = cur; 269 } 270 271 /* 272 * addtty -- 273 * add an entry to a linked list of ttys 274 */ 275 static TTY * 276 addtty(const char *ttyname) 277 { 278 TTY *cur; 279 280 if (!(cur = (TTY *)malloc((u_int)sizeof(TTY)))) 281 err(1, "malloc failure"); 282 cur->next = ttylist; 283 cur->logout = currentout; 284 memmove(cur->tty, ttyname, sizeof(cur->tty)); 285 return (ttylist = cur); 286 } 287 288 /* 289 * hostconv -- 290 * convert the hostname to search pattern; if the supplied host name 291 * has a domain attached that is the same as the current domain, rip 292 * off the domain suffix since that's what login(1) does. 293 */ 294 static void 295 hostconv(char *arg) 296 { 297 static int first = 1; 298 static char *hostdot, name[MAXHOSTNAMELEN + 1]; 299 char *argdot; 300 301 if (!(argdot = strchr(arg, '.'))) 302 return; 303 if (first) { 304 first = 0; 305 if (gethostname(name, sizeof(name))) 306 err(1, "gethostname"); 307 name[sizeof(name) - 1] = '\0'; 308 hostdot = strchr(name, '.'); 309 } 310 if (hostdot && !strcasecmp(hostdot, argdot)) 311 *argdot = '\0'; 312 } 313 314 /* 315 * ttyconv -- 316 * convert tty to correct name. 317 */ 318 static char * 319 ttyconv(char *arg) 320 { 321 char *mval; 322 323 /* 324 * kludge -- we assume that all tty's end with 325 * a two character suffix. 326 */ 327 if (strlen(arg) == 2) { 328 /* either 6 for "ttyxx" or 8 for "console" */ 329 if (!(mval = malloc((u_int)8))) 330 err(1, "malloc failure"); 331 if (!strcmp(arg, "co")) 332 (void)strcpy(mval, "console"); 333 else { 334 (void)strcpy(mval, "tty"); 335 (void)strcpy(mval + 3, arg); 336 } 337 return (mval); 338 } 339 if (!strncmp(arg, _PATH_DEV, sizeof(_PATH_DEV) - 1)) 340 return (arg + 5); 341 return (arg); 342 } 343 344 /* 345 * fmttime -- 346 * return pointer to (static) formatted time string. 347 */ 348 static char * 349 fmttime(time_t t, int flags) 350 { 351 struct tm *tm; 352 static char tbuf[TBUFLEN]; 353 354 tm = (flags & GMT) ? gmtime(&t) : localtime(&t); 355 strftime(tbuf, sizeof(tbuf), 356 (flags & TIMEONLY) 357 ? (flags & FULLTIME ? LTFMTS : TFMTS) 358 : (flags & FULLTIME ? LTFMT : TFMT), 359 tm); 360 return (tbuf); 361 } 362 363 #ifdef SUPPORT_UTMP 364 #define TYPE(a) 0 365 #define NAMESIZE UT_NAMESIZE 366 #define LINESIZE UT_LINESIZE 367 #define HOSTSIZE UT_HOSTSIZE 368 #define ut_timefld ut_time 369 #define FIRSTVALID 0 370 #include "want.c" 371 #undef TYPE /*(a)*/ 372 #undef NAMESIZE 373 #undef LINESIZE 374 #undef HOSTSIZE 375 #undef ut_timefld 376 #undef FIRSTVALID 377 #endif 378 379 #ifdef SUPPORT_UTMPX 380 #define utmp utmpx 381 #define want wantx 382 #define wtmp wtmpx 383 #define buf bufx 384 #define onintr onintrx 385 #define TYPE(a) (a)->ut_type 386 #define NAMESIZE UTX_USERSIZE 387 #define LINESIZE UTX_LINESIZE 388 #define HOSTSIZE UTX_HOSTSIZE 389 #define ut_timefld ut_xtime 390 #define FIRSTVALID 1 391 #include "want.c" 392 #endif 393
Indexes created Tue Sep 30 20:09:53 GMT 2025