1 /* 2 * Copyright (c) 1989, 1993 3 * The Regents of the University of California. All rights reserved. 4 * 5 * This code is derived from software contributed to Berkeley by 6 * Tony Nardo of the Johns Hopkins University/Applied Physics Lab. 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 * @(#)util.c 8.3 (Berkeley) 4/28/95 37 * $FreeBSD: src/usr.bin/finger/util.c,v 1.8.2.6 2002/07/03 01:14:24 des Exp $ 38 * $DragonFly: src/usr.bin/finger/util.c,v 1.3 2003/10/04 20:36:44 hmp Exp $ 39 */ 40 41 #include <sys/param.h> 42 #include <sys/stat.h> 43 #include <ctype.h> 44 #include <db.h> 45 #include <err.h> 46 #include <errno.h> 47 #include <fcntl.h> 48 #include <paths.h> 49 #include <pwd.h> 50 #include <stdio.h> 51 #include <stdlib.h> 52 #include <string.h> 53 #include <unistd.h> 54 #include <utmp.h> 55 #include "finger.h" 56 #include "pathnames.h" 57 58 static void find_idle_and_ttywrite(WHERE *); 59 static void userinfo(PERSON *, struct passwd *); 60 static WHERE *walloc(PERSON *); 61 62 int 63 match(struct passwd *pw, char *user) 64 { 65 char *p, *t; 66 char name[1024]; 67 68 if (!strcasecmp(pw->pw_name, user)) 69 return(1); 70 71 /* 72 * XXX 73 * Why do we skip asterisks!?!? 74 */ 75 (void)strncpy(p = tbuf, pw->pw_gecos, sizeof(tbuf)); 76 tbuf[sizeof(tbuf) - 1] = '\0'; 77 if (*p == '*') 78 ++p; 79 80 /* Ampersands get replaced by the login name. */ 81 if ((p = strtok(p, ",")) == NULL) 82 return(0); 83 84 for (t = name; t < &name[sizeof(name) - 1] && (*t = *p) != '\0'; ++p) { 85 if (*t == '&') { 86 (void)strncpy(t, pw->pw_name, 87 sizeof(name) - (t - name)); 88 name[sizeof(name) - 1] = '\0'; 89 while (t < &name[sizeof(name) - 1] && *++t) 90 continue; 91 } else { 92 ++t; 93 } 94 } 95 *t = '\0'; 96 for (t = name; (p = strtok(t, "\t ")) != NULL; t = NULL) 97 if (!strcasecmp(p, user)) 98 return(1); 99 return(0); 100 } 101 102 void 103 enter_lastlog(PERSON *pn) 104 { 105 WHERE *w; 106 static int opened, fd; 107 struct lastlog ll; 108 char doit = 0; 109 110 /* some systems may not maintain lastlog, don't report errors. */ 111 if (!opened) { 112 fd = open(_PATH_LASTLOG, O_RDONLY, 0); 113 opened = 1; 114 } 115 if (fd == -1 || 116 lseek(fd, (long)pn->uid * sizeof(ll), SEEK_SET) != 117 (long)pn->uid * sizeof(ll) || 118 read(fd, (char *)&ll, sizeof(ll)) != sizeof(ll)) { 119 /* as if never logged in */ 120 ll.ll_line[0] = ll.ll_host[0] = '\0'; 121 ll.ll_time = 0; 122 } 123 if ((w = pn->whead) == NULL) 124 doit = 1; 125 else if (ll.ll_time != 0) { 126 /* if last login is earlier than some current login */ 127 for (; !doit && w != NULL; w = w->next) 128 if (w->info == LOGGEDIN && w->loginat < ll.ll_time) 129 doit = 1; 130 /* 131 * and if it's not any of the current logins 132 * can't use time comparison because there may be a small 133 * discrepancy since login calls time() twice 134 */ 135 for (w = pn->whead; doit && w != NULL; w = w->next) 136 if (w->info == LOGGEDIN && 137 strncmp(w->tty, ll.ll_line, UT_LINESIZE) == 0) 138 doit = 0; 139 } 140 if (doit) { 141 w = walloc(pn); 142 w->info = LASTLOG; 143 bcopy(ll.ll_line, w->tty, UT_LINESIZE); 144 w->tty[UT_LINESIZE] = 0; 145 bcopy(ll.ll_host, w->host, UT_HOSTSIZE); 146 w->host[UT_HOSTSIZE] = 0; 147 w->loginat = ll.ll_time; 148 } 149 } 150 151 void 152 enter_where(struct utmp *ut, PERSON *pn) 153 { 154 WHERE *w; 155 156 w = walloc(pn); 157 w->info = LOGGEDIN; 158 bcopy(ut->ut_line, w->tty, UT_LINESIZE); 159 w->tty[UT_LINESIZE] = 0; 160 bcopy(ut->ut_host, w->host, UT_HOSTSIZE); 161 w->host[UT_HOSTSIZE] = 0; 162 w->loginat = (time_t)ut->ut_time; 163 find_idle_and_ttywrite(w); 164 } 165 166 PERSON * 167 enter_person(struct passwd *pw) 168 { 169 DBT data, key; 170 PERSON *pn; 171 172 if (db == NULL && 173 (db = dbopen(NULL, O_RDWR, 0, DB_BTREE, NULL)) == NULL) 174 err(1, NULL); 175 176 key.data = pw->pw_name; 177 key.size = strlen(pw->pw_name); 178 179 switch ((*db->get)(db, &key, &data, 0)) { 180 case 0: 181 memmove(&pn, data.data, sizeof pn); 182 return (pn); 183 default: 184 case -1: 185 err(1, "db get"); 186 /* NOTREACHED */ 187 case 1: 188 ++entries; 189 pn = palloc(); 190 userinfo(pn, pw); 191 pn->whead = NULL; 192 193 data.size = sizeof(PERSON *); 194 data.data = &pn; 195 if ((*db->put)(db, &key, &data, 0)) 196 err(1, "db put"); 197 return (pn); 198 } 199 } 200 201 PERSON * 202 find_person(char *name) 203 { 204 struct passwd *pw; 205 206 int cnt; 207 DBT data, key; 208 PERSON *p; 209 char buf[UT_NAMESIZE + 1]; 210 211 if (!db) 212 return(NULL); 213 214 if ((pw = getpwnam(name)) && hide(pw)) 215 return(NULL); 216 217 /* Name may be only UT_NAMESIZE long and not NUL terminated. */ 218 for (cnt = 0; cnt < UT_NAMESIZE && *name; ++name, ++cnt) 219 buf[cnt] = *name; 220 buf[cnt] = '\0'; 221 key.data = buf; 222 key.size = cnt; 223 224 if ((*db->get)(db, &key, &data, 0)) 225 return (NULL); 226 memmove(&p, data.data, sizeof p); 227 return (p); 228 } 229 230 PERSON * 231 palloc(void) 232 { 233 PERSON *p; 234 235 if ((p = malloc(sizeof(PERSON))) == NULL) 236 err(1, NULL); 237 return(p); 238 } 239 240 static WHERE * 241 walloc(PERSON *pn) 242 { 243 WHERE *w; 244 245 if ((w = malloc(sizeof(WHERE))) == NULL) 246 err(1, NULL); 247 if (pn->whead == NULL) 248 pn->whead = pn->wtail = w; 249 else { 250 pn->wtail->next = w; 251 pn->wtail = w; 252 } 253 w->next = NULL; 254 return(w); 255 } 256 257 char * 258 prphone(char *num) 259 { 260 char *p; 261 int len; 262 static char pbuf[20]; 263 264 /* don't touch anything if the user has their own formatting */ 265 for (p = num; *p; ++p) 266 if (!isdigit(*p)) 267 return(num); 268 len = p - num; 269 p = pbuf; 270 switch(len) { 271 case 11: /* +0-123-456-7890 */ 272 *p++ = '+'; 273 *p++ = *num++; 274 *p++ = '-'; 275 /* FALLTHROUGH */ 276 case 10: /* 012-345-6789 */ 277 *p++ = *num++; 278 *p++ = *num++; 279 *p++ = *num++; 280 *p++ = '-'; 281 /* FALLTHROUGH */ 282 case 7: /* 012-3456 */ 283 *p++ = *num++; 284 *p++ = *num++; 285 *p++ = *num++; 286 break; 287 case 5: /* x0-1234 */ 288 case 4: /* x1234 */ 289 *p++ = 'x'; 290 *p++ = *num++; 291 break; 292 default: 293 return(num); 294 } 295 if (len != 4) { 296 *p++ = '-'; 297 *p++ = *num++; 298 } 299 *p++ = *num++; 300 *p++ = *num++; 301 *p++ = *num++; 302 *p = '\0'; 303 return(pbuf); 304 } 305 306 static void 307 find_idle_and_ttywrite(WHERE *w) 308 { 309 extern time_t now; 310 struct stat sb; 311 time_t touched; 312 313 (void)snprintf(tbuf, sizeof(tbuf), "%s/%s", _PATH_DEV, w->tty); 314 if (stat(tbuf, &sb) < 0) { 315 warn("%s", tbuf); 316 return; 317 } 318 touched = sb.st_atime; 319 if (touched < w->loginat) { 320 /* tty untouched since before login */ 321 touched = w->loginat; 322 } 323 w->idletime = now < touched ? 0 : now - touched; 324 325 #define TALKABLE 0220 /* tty is writable if 220 mode */ 326 w->writable = ((sb.st_mode & TALKABLE) == TALKABLE); 327 } 328 329 static void 330 userinfo(PERSON *pn, struct passwd *pw) 331 { 332 char *p, *t; 333 char *bp, name[1024]; 334 struct stat sb; 335 336 pn->realname = pn->office = pn->officephone = pn->homephone = NULL; 337 338 pn->uid = pw->pw_uid; 339 if ((pn->name = strdup(pw->pw_name)) == NULL) 340 err(1, "strdup failed"); 341 if ((pn->dir = strdup(pw->pw_dir)) == NULL) 342 err(1, "strdup failed"); 343 if ((pn->shell = strdup(pw->pw_shell)) == NULL) 344 err(1, "strdup failed"); 345 346 /* why do we skip asterisks!?!? */ 347 (void)strncpy(bp = tbuf, pw->pw_gecos, sizeof(tbuf)); 348 tbuf[sizeof(tbuf) - 1] = '\0'; 349 if (*bp == '*') 350 ++bp; 351 352 /* ampersands get replaced by the login name */ 353 if (!(p = strsep(&bp, ","))) 354 return; 355 for (t = name; t < &name[sizeof(name) - 1] && (*t = *p) != '\0'; ++p) { 356 if (*t == '&') { 357 (void)strncpy(t, pw->pw_name, 358 sizeof(name) - (t - name)); 359 name[sizeof(name) - 1] = '\0'; 360 if (islower(*t)) 361 *t = toupper(*t); 362 while (t < &name[sizeof(name) - 1] && *++t) 363 continue; 364 } else { 365 ++t; 366 } 367 } 368 *t = '\0'; 369 if ((pn->realname = strdup(name)) == NULL) 370 err(1, "strdup failed"); 371 pn->office = ((p = strsep(&bp, ",")) && *p) ? 372 strdup(p) : NULL; 373 pn->officephone = ((p = strsep(&bp, ",")) && *p) ? 374 strdup(p) : NULL; 375 pn->homephone = ((p = strsep(&bp, ",")) && *p) ? 376 strdup(p) : NULL; 377 (void)snprintf(tbuf, sizeof(tbuf), "%s/%s", _PATH_MAILDIR, pw->pw_name); 378 pn->mailrecv = -1; /* -1 == not_valid */ 379 if (stat(tbuf, &sb) < 0) { 380 if (errno != ENOENT) { 381 warn("%s", tbuf); 382 return; 383 } 384 } else if (sb.st_size != 0) { 385 pn->mailrecv = sb.st_mtime; 386 pn->mailread = sb.st_atime; 387 } 388 } 389 390 /* 391 * Is this user hiding from finger? 392 * If ~<user>/.nofinger exists, return 1 (hide), else return 0 (nohide). 393 */ 394 395 int 396 hide(struct passwd *pw) 397 { 398 struct stat st; 399 char buf[MAXPATHLEN]; 400 401 if (!pw->pw_dir) 402 return 0; 403 404 snprintf(buf, sizeof(buf), "%s/%s", pw->pw_dir, _PATH_NOFINGER); 405 406 if (stat(buf, &st) == 0) 407 return 1; 408 409 return 0; 410 } 411