1 /* @(#)last.c 8.2 (Berkeley) 4/2/94 */ 2 /* $NetBSD: last.c,v 1.15 2000/06/30 06:19:58 simonb Exp $ */ 3 4 /* 5 * Copyright (c) 1987, 1993, 1994 6 * The Regents of the University of California. All rights reserved. 7 * 8 * Redistribution and use in source and binary forms, with or without 9 * modification, are permitted provided that the following conditions 10 * are met: 11 * 1. Redistributions of source code must retain the above copyright 12 * notice, this list of conditions and the following disclaimer. 13 * 2. Redistributions in binary form must reproduce the above copyright 14 * notice, this list of conditions and the following disclaimer in the 15 * documentation and/or other materials provided with the distribution. 16 * 3. Neither the name of the University nor the names of its contributors 17 * may be used to endorse or promote products derived from this software 18 * without specific prior written permission. 19 * 20 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 21 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 22 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 23 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 24 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 25 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 26 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 27 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 28 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 29 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 30 * SUCH DAMAGE. 31 */ 32 33 #include <sys/param.h> 34 #include <sys/stat.h> 35 36 #include <err.h> 37 #include <fcntl.h> 38 #include <paths.h> 39 #include <signal.h> 40 #include <stdio.h> 41 #include <stdlib.h> 42 #include <string.h> 43 #include <time.h> 44 #include <tzfile.h> 45 #include <unistd.h> 46 #ifdef SUPPORT_UTMPX 47 #include <utmpx.h> 48 #endif 49 #ifdef SUPPORT_UTMP 50 #include <utmp.h> 51 #endif 52 53 #ifndef UT_NAMESIZE 54 #define UT_NAMESIZE 8 55 #define UT_LINESIZE 8 56 #define UT_HOSTSIZE 16 57 #endif 58 #ifndef SIGNATURE 59 #define SIGNATURE -1 60 #endif 61 62 63 64 #define NO 0 /* false/no */ 65 #define YES 1 /* true/yes */ 66 67 #define TBUFLEN 30 /* length of time string buffer */ 68 #define TFMT "%a %b %d %R" /* strftime format string */ 69 #define LTFMT "%a %b %d %Y %T" /* strftime long format string */ 70 #define TFMTS "%R" /* strftime format string - time only */ 71 #define LTFMTS "%T" /* strftime long format string - " */ 72 73 /* fmttime() flags */ 74 #define FULLTIME 0x1 /* show year, seconds */ 75 #define TIMEONLY 0x2 /* show time only, not date */ 76 #define GMT 0x4 /* show time at GMT, for offsets only */ 77 78 #define MAXUTMP 1024; 79 80 typedef struct arg { 81 char *name; /* argument */ 82 #define HOST_TYPE -2 83 #define TTY_TYPE -3 84 #define USER_TYPE -4 85 int type; /* type of arg */ 86 struct arg *next; /* linked list pointer */ 87 } ARG; 88 static ARG *arglist; /* head of linked list */ 89 90 typedef struct ttytab { 91 time_t logout; /* log out time */ 92 char tty[128]; /* terminal name */ 93 struct ttytab *next; /* linked list pointer */ 94 } TTY; 95 static TTY *ttylist; /* head of linked list */ 96 97 static time_t currentout; /* current logout value */ 98 static long maxrec; /* records to display */ 99 static int fulltime = 0; /* Display seconds? */ 100 101 static void addarg(int, char *); 102 static TTY *addtty(const char *); 103 static void hostconv(char *); 104 static char *ttyconv(char *); 105 #ifdef SUPPORT_UTMPX 106 static void wtmpx(const char *, int, int, int); 107 #endif 108 #ifdef SUPPORT_UTMP 109 static void wtmp(const char *, int, int, int); 110 #endif 111 static char *fmttime(time_t, int); 112 static void usage(void); 113 114 static 115 void usage(void) 116 { 117 (void)fprintf(stderr, "Usage: %s [-#%s] [-f file] [-t tty]" 118 " [-h hostname] [-T] [user ...]\n", getprogname(), 119 #ifdef SUPPORT_UTMPX 120 "w" 121 #else 122 "" 123 #endif 124 ); 125 exit(1); 126 } 127 128 int 129 main(int argc, char *argv[]) 130 { 131 int ch; 132 char *p; 133 const char *file = NULL; 134 int namesize = UT_NAMESIZE; 135 int linesize = UT_LINESIZE; 136 int hostsize = UT_HOSTSIZE; 137 138 maxrec = -1; 139 140 while ((ch = getopt(argc, argv, "0123456789f:h:H:L:N:t:T")) != -1) 141 switch (ch) { 142 case '0': case '1': case '2': case '3': case '4': 143 case '5': case '6': case '7': case '8': case '9': 144 /* 145 * kludge: last was originally designed to take 146 * a number after a dash. 147 */ 148 if (maxrec == -1) { 149 p = argv[optind - 1]; 150 if (p[0] == '-' && p[1] == ch && !p[2]) 151 maxrec = atol(++p); 152 else 153 maxrec = atol(argv[optind] + 1); 154 if (!maxrec) 155 exit(0); 156 } 157 break; 158 case 'f': 159 file = optarg; 160 break; 161 case 'h': 162 hostconv(optarg); 163 addarg(HOST_TYPE, optarg); 164 break; 165 case 't': 166 addarg(TTY_TYPE, ttyconv(optarg)); 167 break; 168 case 'U': 169 namesize = atoi(optarg); 170 break; 171 case 'L': 172 linesize = atoi(optarg); 173 break; 174 case 'H': 175 hostsize = atoi(optarg); 176 break; 177 case 'T': 178 fulltime = 1; 179 break; 180 case '?': 181 default: 182 usage(); 183 } 184 185 if (argc) { 186 setlinebuf(stdout); 187 for (argv += optind; *argv; ++argv) { 188 #define COMPATIBILITY 189 #ifdef COMPATIBILITY 190 /* code to allow "last p5" to work */ 191 addarg(TTY_TYPE, ttyconv(*argv)); 192 #endif 193 addarg(USER_TYPE, *argv); 194 } 195 } 196 if (file == NULL) { 197 /* XXX: for now, default to utmp */ 198 #ifdef SUPPORT_UTMP 199 if (access(_PATH_WTMP, R_OK) == 0) 200 file = _PATH_WTMP; 201 else 202 #endif 203 #ifdef SUPPORT_UTMPX 204 if (access(_PATH_WTMPX, R_OK) == 0) 205 file = _PATH_WTMPX; 206 #endif 207 if (file == NULL) 208 #if defined(SUPPORT_UTMPX) && defined(SUPPORT_UTMP) 209 errx(1, "Cannot access `%s' or `%s'", _PATH_WTMPX, 210 _PATH_WTMP); 211 #elif defined(SUPPORT_UTMPX) 212 errx(1, "Cannot access `%s'", _PATH_WTMPX); 213 #elif defined(SUPPORT_UTMP) 214 errx(1, "Cannot access `%s'", _PATH_WTMP); 215 #else 216 errx(1, "No utmp or utmpx support compiled in."); 217 #endif 218 } 219 #if defined(SUPPORT_UTMPX) && defined(SUPPORT_UTMP) 220 if (file[strlen(file) - 1] == 'x') 221 wtmpx(file, namesize, linesize, hostsize); 222 else 223 wtmp(file, namesize, linesize, hostsize); 224 #elif defined(SUPPORT_UTMPX) 225 wtmpx(file, namesize, linesize, hostsize); 226 #elif defined(SUPPORT_UTMP) 227 wtmp(file, namesize, linesize, hostsize); 228 #else 229 errx(1, "Nu utmp or utmpx support compiled in."); 230 #endif 231 exit(0); 232 } 233 234 235 /* 236 * addarg -- 237 * add an entry to a linked list of arguments 238 */ 239 static void 240 addarg(int type, char *arg) 241 { 242 ARG *cur; 243 244 if (!(cur = (ARG *)malloc((u_int)sizeof(ARG)))) 245 err(1, "malloc failure"); 246 cur->next = arglist; 247 cur->type = type; 248 cur->name = arg; 249 arglist = cur; 250 } 251 252 /* 253 * addtty -- 254 * add an entry to a linked list of ttys 255 */ 256 static TTY * 257 addtty(const char *tty) 258 { 259 TTY *cur; 260 261 if (!(cur = (TTY *)malloc((u_int)sizeof(TTY)))) 262 err(1, "malloc failure"); 263 cur->next = ttylist; 264 cur->logout = currentout; 265 memmove(cur->tty, tty, sizeof(cur->tty)); 266 return (ttylist = cur); 267 } 268 269 /* 270 * hostconv -- 271 * convert the hostname to search pattern; if the supplied host name 272 * has a domain attached that is the same as the current domain, rip 273 * off the domain suffix since that's what login(1) does. 274 */ 275 static void 276 hostconv(char *arg) 277 { 278 static int first = 1; 279 static char *hostdot, name[MAXHOSTNAMELEN + 1]; 280 char *argdot; 281 282 if (!(argdot = strchr(arg, '.'))) 283 return; 284 if (first) { 285 first = 0; 286 if (gethostname(name, sizeof(name))) 287 err(1, "gethostname"); 288 name[sizeof(name) - 1] = '\0'; 289 hostdot = strchr(name, '.'); 290 } 291 if (hostdot && !strcasecmp(hostdot, argdot)) 292 *argdot = '\0'; 293 } 294 295 /* 296 * ttyconv -- 297 * convert tty to correct name. 298 */ 299 static char * 300 ttyconv(char *arg) 301 { 302 char *mval; 303 304 /* 305 * kludge -- we assume that all tty's end with 306 * a two character suffix. 307 */ 308 if (strlen(arg) == 2) { 309 /* either 6 for "ttyxx" or 8 for "console" */ 310 if (!(mval = malloc((u_int)8))) 311 err(1, "malloc failure"); 312 if (!strcmp(arg, "co")) 313 (void)strcpy(mval, "console"); 314 else { 315 (void)strcpy(mval, "tty"); 316 (void)strcpy(mval + 3, arg); 317 } 318 return (mval); 319 } 320 if (!strncmp(arg, _PATH_DEV, sizeof(_PATH_DEV) - 1)) 321 return (arg + 5); 322 return (arg); 323 } 324 325 /* 326 * fmttime -- 327 * return pointer to (static) formatted time string. 328 */ 329 static char * 330 fmttime(time_t t, int flags) 331 { 332 struct tm *tm; 333 static char tbuf[TBUFLEN]; 334 335 tm = (flags & GMT) ? gmtime(&t) : localtime(&t); 336 strftime(tbuf, sizeof(tbuf), 337 (flags & TIMEONLY) 338 ? (flags & FULLTIME ? LTFMTS : TFMTS) 339 : (flags & FULLTIME ? LTFMT : TFMT), 340 tm); 341 return (tbuf); 342 } 343 344 #ifdef SUPPORT_UTMP 345 #define TYPE(a) 0 346 #define NAMESIZE UT_NAMESIZE 347 #define LINESIZE UT_LINESIZE 348 #define HOSTSIZE UT_HOSTSIZE 349 #define ut_timefld ut_time 350 #define FIRSTVALID 0 351 #include "want.c" 352 #undef TYPE 353 #undef NAMESIZE 354 #undef LINESIZE 355 #undef HOSTSIZE 356 #undef ut_timefld 357 #undef FIRSTVALID 358 #endif 359 360 #ifdef SUPPORT_UTMPX 361 #define utmp utmpx 362 #define want wantx 363 #define wtmp wtmpx 364 #define buf bufx 365 #define onintr onintrx 366 #define TYPE(a) (a)->ut_type 367 #define NAMESIZE UTX_USERSIZE 368 #define LINESIZE UTX_LINESIZE 369 #define HOSTSIZE UTX_HOSTSIZE 370 #define ut_timefld ut_xtime 371 #define FIRSTVALID 1 372 #include "want.c" 373 #endif 374