last.c revision 1.23
1 /* $NetBSD: last.c,v 1.23 2004/11/11 00:54:23 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 1.23 2004/11/11 00:54:23 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 67 #ifndef UT_NAMESIZE 68 #define UT_NAMESIZE 8 69 #define UT_LINESIZE 8 70 #define UT_HOSTSIZE 16 71 #endif 72 #ifndef SIGNATURE 73 #define SIGNATURE -1 74 #endif 75 76 77 78 #define NO 0 /* false/no */ 79 #define YES 1 /* true/yes */ 80 81 #define TBUFLEN 30 /* length of time string buffer */ 82 #define TFMT "%a %b %d %R" /* strftime format string */ 83 #define LTFMT "%a %b %d %Y %T" /* strftime long format string */ 84 #define TFMTS "%R" /* strftime format string - time only */ 85 #define LTFMTS "%T" /* strftime long format string - " */ 86 87 /* fmttime() flags */ 88 #define FULLTIME 0x1 /* show year, seconds */ 89 #define TIMEONLY 0x2 /* show time only, not date */ 90 #define GMT 0x4 /* show time at GMT, for offsets only */ 91 92 #define MAXUTMP 1024; 93 94 typedef struct arg { 95 char *name; /* argument */ 96 #define HOST_TYPE -2 97 #define TTY_TYPE -3 98 #define USER_TYPE -4 99 int type; /* type of arg */ 100 struct arg *next; /* linked list pointer */ 101 } ARG; 102 static ARG *arglist; /* head of linked list */ 103 104 typedef struct ttytab { 105 time_t logout; /* log out time */ 106 char tty[128]; /* terminal name */ 107 struct ttytab *next; /* linked list pointer */ 108 } TTY; 109 static TTY *ttylist; /* head of linked list */ 110 111 static time_t currentout; /* current logout value */ 112 static long maxrec; /* records to display */ 113 static int fulltime = 0; /* Display seconds? */ 114 115 int main(int, char *[]); 116 117 static void addarg(int, char *); 118 static TTY *addtty(const char *); 119 static void hostconv(char *); 120 static char *ttyconv(char *); 121 #ifdef SUPPORT_UTMPX 122 static void wtmpx(const char *, int, int, int, int); 123 #endif 124 #ifdef SUPPORT_UTMP 125 static void wtmp(const char *, int, int, int, int); 126 #endif 127 static char *fmttime(time_t, int); 128 static void usage(void); 129 130 static 131 void usage(void) 132 { 133 (void)fprintf(stderr, "usage: %s [-#%s] [-T] [-f file]" 134 " [-H hostsize] [-h host] [-L linesize]\n" 135 "\t [-N namesize] [-t tty] [user ...]\n", getprogname(), 136 #ifdef NOTYET_SUPPORT_UTMPX 137 "w" 138 #else 139 "" 140 #endif 141 ); 142 exit(1); 143 } 144 145 int 146 main(int argc, char *argv[]) 147 { 148 int ch; 149 char *p; 150 char *file = NULL; 151 int namesize = UT_NAMESIZE; 152 int linesize = UT_LINESIZE; 153 int hostsize = UT_HOSTSIZE; 154 int numeric = 0; 155 156 maxrec = -1; 157 158 while ((ch = getopt(argc, argv, "0123456789f:H:h:L:nN:Tt:")) != -1) 159 switch (ch) { 160 case '0': case '1': case '2': case '3': case '4': 161 case '5': case '6': case '7': case '8': case '9': 162 /* 163 * kludge: last was originally designed to take 164 * a number after a dash. 165 */ 166 if (maxrec == -1) { 167 p = argv[optind - 1]; 168 if (p[0] == '-' && p[1] == ch && !p[2]) 169 maxrec = atol(++p); 170 else 171 maxrec = atol(argv[optind] + 1); 172 if (!maxrec) 173 exit(0); 174 } 175 break; 176 case 'f': 177 file = optarg; 178 break; 179 case 'H': 180 hostsize = atoi(optarg); 181 break; 182 case 'h': 183 hostconv(optarg); 184 addarg(HOST_TYPE, optarg); 185 break; 186 case 'L': 187 linesize = atoi(optarg); 188 break; 189 case 'N': 190 namesize = atoi(optarg); 191 break; 192 case 'n': 193 numeric = 1; 194 break; 195 case 'T': 196 fulltime = 1; 197 break; 198 case 't': 199 addarg(TTY_TYPE, ttyconv(optarg)); 200 break; 201 case '?': 202 default: 203 usage(); 204 } 205 206 if (argc) { 207 setlinebuf(stdout); 208 for (argv += optind; *argv; ++argv) { 209 #define COMPATIBILITY 210 #ifdef COMPATIBILITY 211 /* code to allow "last p5" to work */ 212 addarg(TTY_TYPE, ttyconv(*argv)); 213 #endif 214 addarg(USER_TYPE, *argv); 215 } 216 } 217 if (file == NULL) { 218 #ifdef SUPPORT_UTMPX 219 if (access(_PATH_WTMPX, R_OK) == 0) 220 file = _PATH_WTMPX; 221 else 222 #endif 223 #ifdef SUPPORT_UTMP 224 if (access(_PATH_WTMP, R_OK) == 0) 225 file = _PATH_WTMP; 226 #endif 227 if (file == NULL) 228 #if defined(SUPPORT_UTMPX) && defined(SUPPORT_UTMP) 229 errx(1, "Cannot access `%s' or `%s'", _PATH_WTMPX, 230 _PATH_WTMP); 231 #elif defined(SUPPORT_UTMPX) 232 errx(1, "Cannot access `%s'", _PATH_WTMPX); 233 #elif defined(SUPPORT_UTMP) 234 errx(1, "Cannot access `%s'", _PATH_WTMP); 235 #else 236 errx(1, "No utmp or utmpx support compiled in."); 237 #endif 238 } 239 #if defined(SUPPORT_UTMPX) && defined(SUPPORT_UTMP) 240 if (file[strlen(file) - 1] == 'x') 241 wtmpx(file, namesize, linesize, hostsize, numeric); 242 else 243 wtmp(file, namesize, linesize, hostsize, numeric); 244 #elif defined(SUPPORT_UTMPX) 245 wtmpx(file, namesize, linesize, hostsize, numeric); 246 #elif defined(SUPPORT_UTMP) 247 wtmp(file, namesize, linesize, hostsize, numeric); 248 #else 249 errx(1, "No utmp or utmpx support compiled in."); 250 #endif 251 exit(0); 252 } 253 254 255 /* 256 * addarg -- 257 * add an entry to a linked list of arguments 258 */ 259 static void 260 addarg(int type, char *arg) 261 { 262 ARG *cur; 263 264 if (!(cur = (ARG *)malloc((u_int)sizeof(ARG)))) 265 err(1, "malloc failure"); 266 cur->next = arglist; 267 cur->type = type; 268 cur->name = arg; 269 arglist = cur; 270 } 271 272 /* 273 * addtty -- 274 * add an entry to a linked list of ttys 275 */ 276 static TTY * 277 addtty(const char *ttyname) 278 { 279 TTY *cur; 280 281 if (!(cur = (TTY *)malloc((u_int)sizeof(TTY)))) 282 err(1, "malloc failure"); 283 cur->next = ttylist; 284 cur->logout = currentout; 285 memmove(cur->tty, ttyname, sizeof(cur->tty)); 286 return (ttylist = cur); 287 } 288 289 /* 290 * hostconv -- 291 * convert the hostname to search pattern; if the supplied host name 292 * has a domain attached that is the same as the current domain, rip 293 * off the domain suffix since that's what login(1) does. 294 */ 295 static void 296 hostconv(char *arg) 297 { 298 static int first = 1; 299 static char *hostdot, name[MAXHOSTNAMELEN + 1]; 300 char *argdot; 301 302 if (!(argdot = strchr(arg, '.'))) 303 return; 304 if (first) { 305 first = 0; 306 if (gethostname(name, sizeof(name))) 307 err(1, "gethostname"); 308 name[sizeof(name) - 1] = '\0'; 309 hostdot = strchr(name, '.'); 310 } 311 if (hostdot && !strcasecmp(hostdot, argdot)) 312 *argdot = '\0'; 313 } 314 315 /* 316 * ttyconv -- 317 * convert tty to correct name. 318 */ 319 static char * 320 ttyconv(char *arg) 321 { 322 char *mval; 323 324 /* 325 * kludge -- we assume that all tty's end with 326 * a two character suffix. 327 */ 328 if (strlen(arg) == 2) { 329 if (!strcmp(arg, "co")) 330 mval = strdup("console"); 331 else 332 asprintf(&mval, "tty%s", arg); 333 if (!mval) 334 err(1, "malloc failure"); 335 return (mval); 336 } 337 if (!strncmp(arg, _PATH_DEV, sizeof(_PATH_DEV) - 1)) 338 return (arg + 5); 339 return (arg); 340 } 341 342 /* 343 * fmttime -- 344 * return pointer to (static) formatted time string. 345 */ 346 static char * 347 fmttime(time_t t, int flags) 348 { 349 struct tm *tm; 350 static char tbuf[TBUFLEN]; 351 352 tm = (flags & GMT) ? gmtime(&t) : localtime(&t); 353 strftime(tbuf, sizeof(tbuf), 354 (flags & TIMEONLY) 355 ? (flags & FULLTIME ? LTFMTS : TFMTS) 356 : (flags & FULLTIME ? LTFMT : TFMT), 357 tm); 358 return (tbuf); 359 } 360 361 #ifdef SUPPORT_UTMP 362 #define TYPE(a) 0 363 #define NAMESIZE UT_NAMESIZE 364 #define LINESIZE UT_LINESIZE 365 #define HOSTSIZE UT_HOSTSIZE 366 #define ut_timefld ut_time 367 #define FIRSTVALID 0 368 #include "want.c" 369 #undef TYPE /*(a)*/ 370 #undef NAMESIZE 371 #undef LINESIZE 372 #undef HOSTSIZE 373 #undef ut_timefld 374 #undef FIRSTVALID 375 #endif 376 377 #ifdef SUPPORT_UTMPX 378 #define utmp utmpx 379 #define want wantx 380 #define wtmp wtmpx 381 #define gethost gethostx 382 #define buf bufx 383 #define onintr onintrx 384 #define TYPE(a) (a)->ut_type 385 #define NAMESIZE UTX_USERSIZE 386 #define LINESIZE UTX_LINESIZE 387 #define HOSTSIZE UTX_HOSTSIZE 388 #define ut_timefld ut_xtime 389 #define FIRSTVALID 1 390 #include "want.c" 391 #endif 392
Indexes created Mon Sep 29 21:09:56 GMT 2025