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. All advertising materials mentioning features or use of this software 17 * must display the following acknowledgement: 18 * This product includes software developed by the University of 19 * California, Berkeley and its contributors. 20 * 4. Neither the name of the University nor the names of its contributors 21 * may be used to endorse or promote products derived from this software 22 * without specific prior written permission. 23 * 24 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 25 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 26 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 27 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 28 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 29 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 30 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 31 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 32 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 33 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 34 * SUCH DAMAGE. 35 */ 36 37 #include <sys/param.h> 38 #include <sys/stat.h> 39 40 #include <err.h> 41 #include <fcntl.h> 42 #include <paths.h> 43 #include <signal.h> 44 #include <stdio.h> 45 #include <stdlib.h> 46 #include <string.h> 47 #include <time.h> 48 #include <tzfile.h> 49 #include <unistd.h> 50 #ifdef SUPPORT_UTMPX 51 #include <utmpx.h> 52 #endif 53 #ifdef SUPPORT_UTMP 54 #include <utmp.h> 55 #endif 56 57 #ifndef UT_NAMESIZE 58 #define UT_NAMESIZE 8 59 #define UT_LINESIZE 8 60 #define UT_HOSTSIZE 16 61 #endif 62 #ifndef SIGNATURE 63 #define SIGNATURE -1 64 #endif 65 66 67 68 #define NO 0 /* false/no */ 69 #define YES 1 /* true/yes */ 70 71 #define TBUFLEN 30 /* length of time string buffer */ 72 #define TFMT "%a %b %d %R" /* strftime format string */ 73 #define LTFMT "%a %b %d %Y %T" /* strftime long format string */ 74 #define TFMTS "%R" /* strftime format string - time only */ 75 #define LTFMTS "%T" /* strftime long format string - " */ 76 77 /* fmttime() flags */ 78 #define FULLTIME 0x1 /* show year, seconds */ 79 #define TIMEONLY 0x2 /* show time only, not date */ 80 #define GMT 0x4 /* show time at GMT, for offsets only */ 81 82 #define MAXUTMP 1024; 83 84 typedef struct arg { 85 char *name; /* argument */ 86 #define HOST_TYPE -2 87 #define TTY_TYPE -3 88 #define USER_TYPE -4 89 int type; /* type of arg */ 90 struct arg *next; /* linked list pointer */ 91 } ARG; 92 static ARG *arglist; /* head of linked list */ 93 94 typedef struct ttytab { 95 time_t logout; /* log out time */ 96 char tty[128]; /* terminal name */ 97 struct ttytab *next; /* linked list pointer */ 98 } TTY; 99 static TTY *ttylist; /* head of linked list */ 100 101 static time_t currentout; /* current logout value */ 102 static long maxrec; /* records to display */ 103 static int fulltime = 0; /* Display seconds? */ 104 105 int main(int, char *[]); 106 107 static void addarg(int, char *); 108 static TTY *addtty(const char *); 109 static void hostconv(char *); 110 static char *ttyconv(char *); 111 #ifdef SUPPORT_UTMPX 112 static void wtmpx(const char *, int, int, int); 113 #endif 114 #ifdef SUPPORT_UTMP 115 static void wtmp(const char *, int, int, int); 116 #endif 117 static char *fmttime(time_t, int); 118 static void usage(void); 119 120 static 121 void usage(void) 122 { 123 (void)fprintf(stderr, "Usage: %s [-#%s] [-f file] [-t tty]" 124 " [-h hostname] [-T] [user ...]\n", getprogname(), 125 #ifdef SUPPORT_UTMPX 126 "w" 127 #else 128 "" 129 #endif 130 ); 131 exit(1); 132 } 133 134 int 135 main(int argc, char *argv[]) 136 { 137 int ch; 138 char *p; 139 const char *file = NULL; 140 int namesize = UT_NAMESIZE; 141 int linesize = UT_LINESIZE; 142 int hostsize = UT_HOSTSIZE; 143 144 maxrec = -1; 145 146 while ((ch = getopt(argc, argv, "0123456789f:h:H:L:N:t:T")) != -1) 147 switch (ch) { 148 case '0': case '1': case '2': case '3': case '4': 149 case '5': case '6': case '7': case '8': case '9': 150 /* 151 * kludge: last was originally designed to take 152 * a number after a dash. 153 */ 154 if (maxrec == -1) { 155 p = argv[optind - 1]; 156 if (p[0] == '-' && p[1] == ch && !p[2]) 157 maxrec = atol(++p); 158 else 159 maxrec = atol(argv[optind] + 1); 160 if (!maxrec) 161 exit(0); 162 } 163 break; 164 case 'f': 165 file = optarg; 166 break; 167 case 'h': 168 hostconv(optarg); 169 addarg(HOST_TYPE, optarg); 170 break; 171 case 't': 172 addarg(TTY_TYPE, ttyconv(optarg)); 173 break; 174 case 'U': 175 namesize = atoi(optarg); 176 break; 177 case 'L': 178 linesize = atoi(optarg); 179 break; 180 case 'H': 181 hostsize = atoi(optarg); 182 break; 183 case 'T': 184 fulltime = 1; 185 break; 186 case '?': 187 default: 188 usage(); 189 } 190 191 if (argc) { 192 setlinebuf(stdout); 193 for (argv += optind; *argv; ++argv) { 194 #define COMPATIBILITY 195 #ifdef COMPATIBILITY 196 /* code to allow "last p5" to work */ 197 addarg(TTY_TYPE, ttyconv(*argv)); 198 #endif 199 addarg(USER_TYPE, *argv); 200 } 201 } 202 if (file == NULL) { 203 /* XXX: for now, default to utmp */ 204 #ifdef SUPPORT_UTMP 205 if (access(_PATH_WTMP, R_OK) == 0) 206 file = _PATH_WTMP; 207 else 208 #endif 209 #ifdef SUPPORT_UTMPX 210 if (access(_PATH_WTMPX, R_OK) == 0) 211 file = _PATH_WTMPX; 212 #endif 213 if (file == NULL) 214 #if defined(SUPPORT_UTMPX) && defined(SUPPORT_UTMP) 215 errx(1, "Cannot access `%s' or `%s'", _PATH_WTMPX, 216 _PATH_WTMP); 217 #elif defined(SUPPORT_UTMPX) 218 errx(1, "Cannot access `%s'", _PATH_WTMPX); 219 #elif defined(SUPPORT_UTMP) 220 errx(1, "Cannot access `%s'", _PATH_WTMP); 221 #else 222 errx(1, "No utmp or utmpx support compiled in."); 223 #endif 224 } 225 #if defined(SUPPORT_UTMPX) && defined(SUPPORT_UTMP) 226 if (file[strlen(file) - 1] == 'x') 227 wtmpx(file, namesize, linesize, hostsize); 228 else 229 wtmp(file, namesize, linesize, hostsize); 230 #elif defined(SUPPORT_UTMPX) 231 wtmpx(file, namesize, linesize, hostsize); 232 #elif defined(SUPPORT_UTMP) 233 wtmp(file, namesize, linesize, hostsize); 234 #else 235 errx(1, "Nu utmp or utmpx support compiled in."); 236 #endif 237 exit(0); 238 } 239 240 241 /* 242 * addarg -- 243 * add an entry to a linked list of arguments 244 */ 245 static void 246 addarg(int type, char *arg) 247 { 248 ARG *cur; 249 250 if (!(cur = (ARG *)malloc((u_int)sizeof(ARG)))) 251 err(1, "malloc failure"); 252 cur->next = arglist; 253 cur->type = type; 254 cur->name = arg; 255 arglist = cur; 256 } 257 258 /* 259 * addtty -- 260 * add an entry to a linked list of ttys 261 */ 262 static TTY * 263 addtty(const char *tty) 264 { 265 TTY *cur; 266 267 if (!(cur = (TTY *)malloc((u_int)sizeof(TTY)))) 268 err(1, "malloc failure"); 269 cur->next = ttylist; 270 cur->logout = currentout; 271 memmove(cur->tty, tty, sizeof(cur->tty)); 272 return (ttylist = cur); 273 } 274 275 /* 276 * hostconv -- 277 * convert the hostname to search pattern; if the supplied host name 278 * has a domain attached that is the same as the current domain, rip 279 * off the domain suffix since that's what login(1) does. 280 */ 281 static void 282 hostconv(char *arg) 283 { 284 static int first = 1; 285 static char *hostdot, name[MAXHOSTNAMELEN + 1]; 286 char *argdot; 287 288 if (!(argdot = strchr(arg, '.'))) 289 return; 290 if (first) { 291 first = 0; 292 if (gethostname(name, sizeof(name))) 293 err(1, "gethostname"); 294 name[sizeof(name) - 1] = '\0'; 295 hostdot = strchr(name, '.'); 296 } 297 if (hostdot && !strcasecmp(hostdot, argdot)) 298 *argdot = '\0'; 299 } 300 301 /* 302 * ttyconv -- 303 * convert tty to correct name. 304 */ 305 static char * 306 ttyconv(char *arg) 307 { 308 char *mval; 309 310 /* 311 * kludge -- we assume that all tty's end with 312 * a two character suffix. 313 */ 314 if (strlen(arg) == 2) { 315 /* either 6 for "ttyxx" or 8 for "console" */ 316 if (!(mval = malloc((u_int)8))) 317 err(1, "malloc failure"); 318 if (!strcmp(arg, "co")) 319 (void)strcpy(mval, "console"); 320 else { 321 (void)strcpy(mval, "tty"); 322 (void)strcpy(mval + 3, arg); 323 } 324 return (mval); 325 } 326 if (!strncmp(arg, _PATH_DEV, sizeof(_PATH_DEV) - 1)) 327 return (arg + 5); 328 return (arg); 329 } 330 331 /* 332 * fmttime -- 333 * return pointer to (static) formatted time string. 334 */ 335 static char * 336 fmttime(time_t t, int flags) 337 { 338 struct tm *tm; 339 static char tbuf[TBUFLEN]; 340 341 tm = (flags & GMT) ? gmtime(&t) : localtime(&t); 342 strftime(tbuf, sizeof(tbuf), 343 (flags & TIMEONLY) 344 ? (flags & FULLTIME ? LTFMTS : TFMTS) 345 : (flags & FULLTIME ? LTFMT : TFMT), 346 tm); 347 return (tbuf); 348 } 349 350 #ifdef SUPPORT_UTMP 351 #define TYPE(a) 0 352 #define NAMESIZE UT_NAMESIZE 353 #define LINESIZE UT_LINESIZE 354 #define HOSTSIZE UT_HOSTSIZE 355 #define ut_timefld ut_time 356 #define FIRSTVALID 0 357 #include "want.c" 358 #undef TYPE 359 #undef NAMESIZE 360 #undef LINESIZE 361 #undef HOSTSIZE 362 #undef ut_timefld 363 #undef FIRSTVALID 364 #endif 365 366 #ifdef SUPPORT_UTMPX 367 #define utmp utmpx 368 #define want wantx 369 #define wtmp wtmpx 370 #define buf bufx 371 #define onintr onintrx 372 #define TYPE(a) (a)->ut_type 373 #define NAMESIZE UTX_USERSIZE 374 #define LINESIZE UTX_LINESIZE 375 #define HOSTSIZE UTX_HOSTSIZE 376 #define ut_timefld ut_xtime 377 #define FIRSTVALID 1 378 #include "want.c" 379 #endif 380