last.c revision 1.25
1 /* $NetBSD: last.c,v 1.25 2004/11/19 21:41:25 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 1.25 2004/11/19 21:41:25 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? */ 115 116 int main(int, char *[]); 117 118 static void addarg(int, char *); 119 static TTY *addtty(const char *); 120 static void hostconv(char *); 121 static char *ttyconv(char *); 122 #ifdef SUPPORT_UTMPX 123 static void wtmpx(const char *, int, int, int, int); 124 #endif 125 #ifdef SUPPORT_UTMP 126 static void wtmp(const char *, int, int, int, int); 127 #endif 128 static char *fmttime(time_t, int); 129 static void usage(void); 130 131 static 132 void usage(void) 133 { 134 (void)fprintf(stderr, "usage: %s [-#%s] [-nT] [-f file]" 135 " [-H hostsize] [-h host] [-L linesize]\n" 136 "\t [-N namesize] [-t tty] [user ...]\n", getprogname(), 137 #ifdef NOTYET_SUPPORT_UTMPX 138 "w" 139 #else 140 "" 141 #endif 142 ); 143 exit(1); 144 } 145 146 int 147 main(int argc, char *argv[]) 148 { 149 int ch; 150 char *p; 151 char *file = NULL; 152 int namesize = UT_NAMESIZE; 153 int linesize = UT_LINESIZE; 154 int hostsize = UT_HOSTSIZE; 155 int numeric = 0; 156 157 maxrec = -1; 158 159 while ((ch = getopt(argc, argv, "0123456789f:H:h:L:nN:Tt:")) != -1) 160 switch (ch) { 161 case '0': case '1': case '2': case '3': case '4': 162 case '5': case '6': case '7': case '8': case '9': 163 /* 164 * kludge: last was originally designed to take 165 * a number after a dash. 166 */ 167 if (maxrec == -1) { 168 p = argv[optind - 1]; 169 if (p[0] == '-' && p[1] == ch && !p[2]) 170 maxrec = atol(++p); 171 else 172 maxrec = atol(argv[optind] + 1); 173 if (!maxrec) 174 exit(0); 175 } 176 break; 177 case 'f': 178 file = optarg; 179 break; 180 case 'H': 181 hostsize = atoi(optarg); 182 break; 183 case 'h': 184 hostconv(optarg); 185 addarg(HOST_TYPE, optarg); 186 break; 187 case 'L': 188 linesize = atoi(optarg); 189 break; 190 case 'N': 191 namesize = atoi(optarg); 192 break; 193 case 'n': 194 numeric = 1; 195 break; 196 case 'T': 197 fulltime = 1; 198 break; 199 case 't': 200 addarg(TTY_TYPE, ttyconv(optarg)); 201 break; 202 case '?': 203 default: 204 usage(); 205 } 206 207 if (argc) { 208 setlinebuf(stdout); 209 for (argv += optind; *argv; ++argv) { 210 #define COMPATIBILITY 211 #ifdef COMPATIBILITY 212 /* code to allow "last p5" to work */ 213 addarg(TTY_TYPE, ttyconv(*argv)); 214 #endif 215 addarg(USER_TYPE, *argv); 216 } 217 } 218 if (file == NULL) { 219 #ifdef SUPPORT_UTMPX 220 if (access(_PATH_WTMPX, R_OK) == 0) 221 file = _PATH_WTMPX; 222 else 223 #endif 224 #ifdef SUPPORT_UTMP 225 if (access(_PATH_WTMP, R_OK) == 0) 226 file = _PATH_WTMP; 227 #endif 228 if (file == NULL) 229 #if defined(SUPPORT_UTMPX) && defined(SUPPORT_UTMP) 230 errx(1, "Cannot access `%s' or `%s'", _PATH_WTMPX, 231 _PATH_WTMP); 232 #elif defined(SUPPORT_UTMPX) 233 errx(1, "Cannot access `%s'", _PATH_WTMPX); 234 #elif defined(SUPPORT_UTMP) 235 errx(1, "Cannot access `%s'", _PATH_WTMP); 236 #else 237 errx(1, "No utmp or utmpx support compiled in."); 238 #endif 239 } 240 #if defined(SUPPORT_UTMPX) && defined(SUPPORT_UTMP) 241 if (file[strlen(file) - 1] == 'x') 242 wtmpx(file, namesize, linesize, hostsize, numeric); 243 else 244 wtmp(file, namesize, linesize, hostsize, numeric); 245 #elif defined(SUPPORT_UTMPX) 246 wtmpx(file, namesize, linesize, hostsize, numeric); 247 #elif defined(SUPPORT_UTMP) 248 wtmp(file, namesize, linesize, hostsize, numeric); 249 #else 250 errx(1, "No utmp or utmpx support compiled in."); 251 #endif 252 exit(0); 253 } 254 255 256 /* 257 * addarg -- 258 * add an entry to a linked list of arguments 259 */ 260 static void 261 addarg(int type, char *arg) 262 { 263 ARG *cur; 264 265 if (!(cur = (ARG *)malloc((u_int)sizeof(ARG)))) 266 err(1, "malloc failure"); 267 cur->next = arglist; 268 cur->type = type; 269 cur->name = arg; 270 arglist = cur; 271 } 272 273 /* 274 * addtty -- 275 * add an entry to a linked list of ttys 276 */ 277 static TTY * 278 addtty(const char *ttyname) 279 { 280 TTY *cur; 281 282 if (!(cur = (TTY *)malloc((u_int)sizeof(TTY)))) 283 err(1, "malloc failure"); 284 cur->next = ttylist; 285 cur->logout = currentout; 286 memmove(cur->tty, ttyname, sizeof(cur->tty)); 287 return (ttylist = cur); 288 } 289 290 /* 291 * hostconv -- 292 * convert the hostname to search pattern; if the supplied host name 293 * has a domain attached that is the same as the current domain, rip 294 * off the domain suffix since that's what login(1) does. 295 */ 296 static void 297 hostconv(char *arg) 298 { 299 static int first = 1; 300 static char *hostdot, name[MAXHOSTNAMELEN + 1]; 301 char *argdot; 302 303 if (!(argdot = strchr(arg, '.'))) 304 return; 305 if (first) { 306 first = 0; 307 if (gethostname(name, sizeof(name))) 308 err(1, "gethostname"); 309 name[sizeof(name) - 1] = '\0'; 310 hostdot = strchr(name, '.'); 311 } 312 if (hostdot && !strcasecmp(hostdot, argdot)) 313 *argdot = '\0'; 314 } 315 316 /* 317 * ttyconv -- 318 * convert tty to correct name. 319 */ 320 static char * 321 ttyconv(char *arg) 322 { 323 char *mval; 324 325 /* 326 * kludge -- we assume that all tty's end with 327 * a two character suffix. 328 */ 329 if (strlen(arg) == 2) { 330 if (!strcmp(arg, "co")) 331 mval = strdup("console"); 332 else 333 asprintf(&mval, "tty%s", arg); 334 if (!mval) 335 err(1, "malloc failure"); 336 return (mval); 337 } 338 if (!strncmp(arg, _PATH_DEV, sizeof(_PATH_DEV) - 1)) 339 return (arg + 5); 340 return (arg); 341 } 342 343 /* 344 * fmttime -- 345 * return pointer to (static) formatted time string. 346 */ 347 static char * 348 fmttime(time_t t, int flags) 349 { 350 struct tm *tm; 351 static char tbuf[TBUFLEN]; 352 353 tm = (flags & GMT) ? gmtime(&t) : localtime(&t); 354 strftime(tbuf, sizeof(tbuf), 355 (flags & TIMEONLY) 356 ? (flags & FULLTIME ? LTFMTS : TFMTS) 357 : (flags & FULLTIME ? LTFMT : TFMT), 358 tm); 359 return (tbuf); 360 } 361 362 #ifdef SUPPORT_UTMP 363 #define TYPE(a) 0 364 #define NAMESIZE UT_NAMESIZE 365 #define LINESIZE UT_LINESIZE 366 #define HOSTSIZE UT_HOSTSIZE 367 #define ut_timefld ut_time 368 #define FIRSTVALID 0 369 #include "want.c" 370 #undef TYPE /*(a)*/ 371 #undef NAMESIZE 372 #undef LINESIZE 373 #undef HOSTSIZE 374 #undef ut_timefld 375 #undef FIRSTVALID 376 #endif 377 378 #ifdef SUPPORT_UTMPX 379 #define utmp utmpx 380 #define want wantx 381 #define wtmp wtmpx 382 #define gethost gethostx 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 Wed Oct 01 07:09:59 GMT 2025