last.c revision 1.21
1 /* $NetBSD: last.c,v 1.21 2003/08/07 11:14:17 agc 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 1.21 2003/08/07 11:14:17 agc 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 #ifdef SUPPORT_UTMPX 60 #include <utmpx.h> 61 #endif 62 #ifdef SUPPORT_UTMP 63 #include <utmp.h> 64 #endif 65 66 #ifndef UT_NAMESIZE 67 #define UT_NAMESIZE 8 68 #define UT_LINESIZE 8 69 #define UT_HOSTSIZE 16 70 #endif 71 #ifndef SIGNATURE 72 #define SIGNATURE -1 73 #endif 74 75 76 77 #define NO 0 /* false/no */ 78 #define YES 1 /* true/yes */ 79 80 #define TBUFLEN 30 /* length of time string buffer */ 81 #define TFMT "%a %b %d %R" /* strftime format string */ 82 #define LTFMT "%a %b %d %Y %T" /* strftime long format string */ 83 #define TFMTS "%R" /* strftime format string - time only */ 84 #define LTFMTS "%T" /* strftime long format string - " */ 85 86 /* fmttime() flags */ 87 #define FULLTIME 0x1 /* show year, seconds */ 88 #define TIMEONLY 0x2 /* show time only, not date */ 89 #define GMT 0x4 /* show time at GMT, for offsets only */ 90 91 #define MAXUTMP 1024; 92 93 typedef struct arg { 94 char *name; /* argument */ 95 #define HOST_TYPE -2 96 #define TTY_TYPE -3 97 #define USER_TYPE -4 98 int type; /* type of arg */ 99 struct arg *next; /* linked list pointer */ 100 } ARG; 101 static ARG *arglist; /* head of linked list */ 102 103 typedef struct ttytab { 104 time_t logout; /* log out time */ 105 char tty[128]; /* terminal name */ 106 struct ttytab *next; /* linked list pointer */ 107 } TTY; 108 static TTY *ttylist; /* head of linked list */ 109 110 static time_t currentout; /* current logout value */ 111 static long maxrec; /* records to display */ 112 static int fulltime = 0; /* Display seconds? */ 113 114 int main(int, char *[]); 115 116 static void addarg(int, char *); 117 static TTY *addtty(const char *); 118 static void hostconv(char *); 119 static char *ttyconv(char *); 120 #ifdef SUPPORT_UTMPX 121 static void wtmpx(const char *, int, int, int); 122 #endif 123 #ifdef SUPPORT_UTMP 124 static void wtmp(const char *, int, int, int); 125 #endif 126 static char *fmttime(time_t, int); 127 static void usage(void); 128 129 static 130 void usage(void) 131 { 132 (void)fprintf(stderr, "Usage: %s [-#%s] [-T] [-f file]" 133 " [-H hostsize] [-h host] [-L linesize]\n" 134 "\t [-N namesize] [-t tty] [user ...]\n", getprogname(), 135 #ifdef NOTYET_SUPPORT_UTMPX 136 "w" 137 #else 138 "" 139 #endif 140 ); 141 exit(1); 142 } 143 144 int 145 main(int argc, char *argv[]) 146 { 147 int ch; 148 char *p; 149 char *file = NULL; 150 int namesize = UT_NAMESIZE; 151 int linesize = UT_LINESIZE; 152 int hostsize = UT_HOSTSIZE; 153 154 maxrec = -1; 155 156 while ((ch = getopt(argc, argv, "0123456789f:H:h:L:N:Tt:")) != -1) 157 switch (ch) { 158 case '0': case '1': case '2': case '3': case '4': 159 case '5': case '6': case '7': case '8': case '9': 160 /* 161 * kludge: last was originally designed to take 162 * a number after a dash. 163 */ 164 if (maxrec == -1) { 165 p = argv[optind - 1]; 166 if (p[0] == '-' && p[1] == ch && !p[2]) 167 maxrec = atol(++p); 168 else 169 maxrec = atol(argv[optind] + 1); 170 if (!maxrec) 171 exit(0); 172 } 173 break; 174 case 'f': 175 file = optarg; 176 break; 177 case 'H': 178 hostsize = atoi(optarg); 179 break; 180 case 'h': 181 hostconv(optarg); 182 addarg(HOST_TYPE, optarg); 183 break; 184 case 'L': 185 linesize = atoi(optarg); 186 break; 187 case 'N': 188 namesize = atoi(optarg); 189 break; 190 case 'T': 191 fulltime = 1; 192 break; 193 case 't': 194 addarg(TTY_TYPE, ttyconv(optarg)); 195 break; 196 case '?': 197 default: 198 usage(); 199 } 200 201 if (argc) { 202 setlinebuf(stdout); 203 for (argv += optind; *argv; ++argv) { 204 #define COMPATIBILITY 205 #ifdef COMPATIBILITY 206 /* code to allow "last p5" to work */ 207 addarg(TTY_TYPE, ttyconv(*argv)); 208 #endif 209 addarg(USER_TYPE, *argv); 210 } 211 } 212 if (file == NULL) { 213 #ifdef SUPPORT_UTMPX 214 if (access(_PATH_WTMPX, R_OK) == 0) 215 file = _PATH_WTMPX; 216 else 217 #endif 218 #ifdef SUPPORT_UTMP 219 if (access(_PATH_WTMP, R_OK) == 0) 220 file = _PATH_WTMP; 221 #endif 222 if (file == NULL) 223 #if defined(SUPPORT_UTMPX) && defined(SUPPORT_UTMP) 224 errx(1, "Cannot access `%s' or `%s'", _PATH_WTMPX, 225 _PATH_WTMP); 226 #elif defined(SUPPORT_UTMPX) 227 errx(1, "Cannot access `%s'", _PATH_WTMPX); 228 #elif defined(SUPPORT_UTMP) 229 errx(1, "Cannot access `%s'", _PATH_WTMP); 230 #else 231 errx(1, "No utmp or utmpx support compiled in."); 232 #endif 233 } 234 #if defined(SUPPORT_UTMPX) && defined(SUPPORT_UTMP) 235 if (file[strlen(file) - 1] == 'x') 236 wtmpx(file, namesize, linesize, hostsize); 237 else 238 wtmp(file, namesize, linesize, hostsize); 239 #elif defined(SUPPORT_UTMPX) 240 wtmpx(file, namesize, linesize, hostsize); 241 #elif defined(SUPPORT_UTMP) 242 wtmp(file, namesize, linesize, hostsize); 243 #else 244 errx(1, "No utmp or utmpx support compiled in."); 245 #endif 246 exit(0); 247 } 248 249 250 /* 251 * addarg -- 252 * add an entry to a linked list of arguments 253 */ 254 static void 255 addarg(int type, char *arg) 256 { 257 ARG *cur; 258 259 if (!(cur = (ARG *)malloc((u_int)sizeof(ARG)))) 260 err(1, "malloc failure"); 261 cur->next = arglist; 262 cur->type = type; 263 cur->name = arg; 264 arglist = cur; 265 } 266 267 /* 268 * addtty -- 269 * add an entry to a linked list of ttys 270 */ 271 static TTY * 272 addtty(const char *ttyname) 273 { 274 TTY *cur; 275 276 if (!(cur = (TTY *)malloc((u_int)sizeof(TTY)))) 277 err(1, "malloc failure"); 278 cur->next = ttylist; 279 cur->logout = currentout; 280 memmove(cur->tty, ttyname, sizeof(cur->tty)); 281 return (ttylist = cur); 282 } 283 284 /* 285 * hostconv -- 286 * convert the hostname to search pattern; if the supplied host name 287 * has a domain attached that is the same as the current domain, rip 288 * off the domain suffix since that's what login(1) does. 289 */ 290 static void 291 hostconv(char *arg) 292 { 293 static int first = 1; 294 static char *hostdot, name[MAXHOSTNAMELEN + 1]; 295 char *argdot; 296 297 if (!(argdot = strchr(arg, '.'))) 298 return; 299 if (first) { 300 first = 0; 301 if (gethostname(name, sizeof(name))) 302 err(1, "gethostname"); 303 name[sizeof(name) - 1] = '\0'; 304 hostdot = strchr(name, '.'); 305 } 306 if (hostdot && !strcasecmp(hostdot, argdot)) 307 *argdot = '\0'; 308 } 309 310 /* 311 * ttyconv -- 312 * convert tty to correct name. 313 */ 314 static char * 315 ttyconv(char *arg) 316 { 317 char *mval; 318 319 /* 320 * kludge -- we assume that all tty's end with 321 * a two character suffix. 322 */ 323 if (strlen(arg) == 2) { 324 if (!strcmp(arg, "co")) 325 mval = strdup("console"); 326 else 327 asprintf(&mval, "tty%s", arg); 328 if (!mval) 329 err(1, "malloc failure"); 330 return (mval); 331 } 332 if (!strncmp(arg, _PATH_DEV, sizeof(_PATH_DEV) - 1)) 333 return (arg + 5); 334 return (arg); 335 } 336 337 /* 338 * fmttime -- 339 * return pointer to (static) formatted time string. 340 */ 341 static char * 342 fmttime(time_t t, int flags) 343 { 344 struct tm *tm; 345 static char tbuf[TBUFLEN]; 346 347 tm = (flags & GMT) ? gmtime(&t) : localtime(&t); 348 strftime(tbuf, sizeof(tbuf), 349 (flags & TIMEONLY) 350 ? (flags & FULLTIME ? LTFMTS : TFMTS) 351 : (flags & FULLTIME ? LTFMT : TFMT), 352 tm); 353 return (tbuf); 354 } 355 356 #ifdef SUPPORT_UTMP 357 #define TYPE(a) 0 358 #define NAMESIZE UT_NAMESIZE 359 #define LINESIZE UT_LINESIZE 360 #define HOSTSIZE UT_HOSTSIZE 361 #define ut_timefld ut_time 362 #define FIRSTVALID 0 363 #include "want.c" 364 #undef TYPE /*(a)*/ 365 #undef NAMESIZE 366 #undef LINESIZE 367 #undef HOSTSIZE 368 #undef ut_timefld 369 #undef FIRSTVALID 370 #endif 371 372 #ifdef SUPPORT_UTMPX 373 #define utmp utmpx 374 #define want wantx 375 #define wtmp wtmpx 376 #define buf bufx 377 #define onintr onintrx 378 #define TYPE(a) (a)->ut_type 379 #define NAMESIZE UTX_USERSIZE 380 #define LINESIZE UTX_LINESIZE 381 #define HOSTSIZE UTX_HOSTSIZE 382 #define ut_timefld ut_xtime 383 #define FIRSTVALID 1 384 #include "want.c" 385 #endif 386
Indexes created Mon Sep 29 21:09:56 GMT 2025