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/socket.h> 43 #include <sys/stat.h> 44 #include <ctype.h> 45 #include <db.h> 46 #include <err.h> 47 #include <errno.h> 48 #include <fcntl.h> 49 #include <paths.h> 50 #include <pwd.h> 51 #include <stdio.h> 52 #include <stdlib.h> 53 #include <string.h> 54 #include <unistd.h> 55 #include <utmp.h> 56 #include "finger.h" 57 #include "pathnames.h" 58 59 static void find_idle_and_ttywrite(WHERE *); 60 static void userinfo(PERSON *, struct passwd *); 61 static WHERE *walloc(PERSON *); 62 63 int 64 match(struct passwd *pw, char *user) 65 { 66 char *p, *t; 67 char name[1024]; 68 69 if (!strcasecmp(pw->pw_name, user)) 70 return(1); 71 72 /* 73 * XXX 74 * Why do we skip asterisks!?!? 75 */ 76 (void)strncpy(p = tbuf, pw->pw_gecos, sizeof(tbuf)); 77 tbuf[sizeof(tbuf) - 1] = '\0'; 78 if (*p == '*') 79 ++p; 80 81 /* Ampersands get replaced by the login name. */ 82 if ((p = strtok(p, ",")) == NULL) 83 return(0); 84 85 for (t = name; t < &name[sizeof(name) - 1] && (*t = *p) != '\0'; ++p) { 86 if (*t == '&') { 87 (void)strncpy(t, pw->pw_name, 88 sizeof(name) - (t - name)); 89 name[sizeof(name) - 1] = '\0'; 90 while (t < &name[sizeof(name) - 1] && *++t) 91 continue; 92 } else { 93 ++t; 94 } 95 } 96 *t = '\0'; 97 for (t = name; (p = strtok(t, "\t ")) != NULL; t = NULL) 98 if (!strcasecmp(p, user)) 99 return(1); 100 return(0); 101 } 102 103 void 104 enter_lastlog(PERSON *pn) 105 { 106 WHERE *w; 107 static int opened, fd; 108 struct lastlog ll; 109 char doit = 0; 110 111 /* some systems may not maintain lastlog, don't report errors. */ 112 if (!opened) { 113 fd = open(_PATH_LASTLOG, O_RDONLY, 0); 114 opened = 1; 115 } 116 if (fd == -1 || 117 lseek(fd, (long)pn->uid * sizeof(ll), SEEK_SET) != 118 (long)pn->uid * sizeof(ll) || 119 read(fd, (char *)&ll, sizeof(ll)) != sizeof(ll)) { 120 /* as if never logged in */ 121 ll.ll_line[0] = ll.ll_host[0] = '\0'; 122 ll.ll_time = 0; 123 } 124 if ((w = pn->whead) == NULL) 125 doit = 1; 126 else if (ll.ll_time != 0) { 127 /* if last login is earlier than some current login */ 128 for (; !doit && w != NULL; w = w->next) 129 if (w->info == LOGGEDIN && w->loginat < ll.ll_time) 130 doit = 1; 131 /* 132 * and if it's not any of the current logins 133 * can't use time comparison because there may be a small 134 * discrepancy since login calls time() twice 135 */ 136 for (w = pn->whead; doit && w != NULL; w = w->next) 137 if (w->info == LOGGEDIN && 138 strncmp(w->tty, ll.ll_line, UT_LINESIZE) == 0) 139 doit = 0; 140 } 141 if (doit) { 142 w = walloc(pn); 143 w->info = LASTLOG; 144 bcopy(ll.ll_line, w->tty, UT_LINESIZE); 145 w->tty[UT_LINESIZE] = 0; 146 bcopy(ll.ll_host, w->host, UT_HOSTSIZE); 147 w->host[UT_HOSTSIZE] = 0; 148 w->loginat = ll.ll_time; 149 } 150 } 151 152 void 153 enter_where(struct utmp *ut, PERSON *pn) 154 { 155 WHERE *w; 156 157 w = walloc(pn); 158 w->info = LOGGEDIN; 159 bcopy(ut->ut_line, w->tty, UT_LINESIZE); 160 w->tty[UT_LINESIZE] = 0; 161 bcopy(ut->ut_host, w->host, UT_HOSTSIZE); 162 w->host[UT_HOSTSIZE] = 0; 163 w->loginat = (time_t)ut->ut_time; 164 find_idle_and_ttywrite(w); 165 } 166 167 PERSON * 168 enter_person(struct passwd *pw) 169 { 170 DBT data, key; 171 PERSON *pn; 172 173 if (db == NULL && 174 (db = dbopen(NULL, O_RDWR, 0, DB_BTREE, NULL)) == NULL) 175 err(1, NULL); 176 177 key.data = pw->pw_name; 178 key.size = strlen(pw->pw_name); 179 180 switch ((*db->get)(db, &key, &data, 0)) { 181 case 0: 182 memmove(&pn, data.data, sizeof pn); 183 return (pn); 184 default: 185 case -1: 186 err(1, "db get"); 187 /* NOTREACHED */ 188 case 1: 189 ++entries; 190 pn = palloc(); 191 userinfo(pn, pw); 192 pn->whead = NULL; 193 194 data.size = sizeof(PERSON *); 195 data.data = &pn; 196 if ((*db->put)(db, &key, &data, 0)) 197 err(1, "db put"); 198 return (pn); 199 } 200 } 201 202 PERSON * 203 find_person(char *name) 204 { 205 struct passwd *pw; 206 207 int cnt; 208 DBT data, key; 209 PERSON *p; 210 char buf[UT_NAMESIZE + 1]; 211 212 if (!db) 213 return(NULL); 214 215 if ((pw = getpwnam(name)) && hide(pw)) 216 return(NULL); 217 218 /* Name may be only UT_NAMESIZE long and not NUL terminated. */ 219 for (cnt = 0; cnt < UT_NAMESIZE && *name; ++name, ++cnt) 220 buf[cnt] = *name; 221 buf[cnt] = '\0'; 222 key.data = buf; 223 key.size = cnt; 224 225 if ((*db->get)(db, &key, &data, 0)) 226 return (NULL); 227 memmove(&p, data.data, sizeof p); 228 return (p); 229 } 230 231 PERSON * 232 palloc(void) 233 { 234 PERSON *p; 235 236 if ((p = malloc(sizeof(PERSON))) == NULL) 237 err(1, NULL); 238 return(p); 239 } 240 241 static WHERE * 242 walloc(PERSON *pn) 243 { 244 WHERE *w; 245 246 if ((w = malloc(sizeof(WHERE))) == NULL) 247 err(1, NULL); 248 if (pn->whead == NULL) 249 pn->whead = pn->wtail = w; 250 else { 251 pn->wtail->next = w; 252 pn->wtail = w; 253 } 254 w->next = NULL; 255 return(w); 256 } 257 258 char * 259 prphone(char *num) 260 { 261 char *p; 262 int len; 263 static char pbuf[20]; 264 265 /* don't touch anything if the user has their own formatting */ 266 for (p = num; *p; ++p) 267 if (!isdigit(*p)) 268 return(num); 269 len = p - num; 270 p = pbuf; 271 switch(len) { 272 case 11: /* +0-123-456-7890 */ 273 *p++ = '+'; 274 *p++ = *num++; 275 *p++ = '-'; 276 /* FALLTHROUGH */ 277 case 10: /* 012-345-6789 */ 278 *p++ = *num++; 279 *p++ = *num++; 280 *p++ = *num++; 281 *p++ = '-'; 282 /* FALLTHROUGH */ 283 case 7: /* 012-3456 */ 284 *p++ = *num++; 285 *p++ = *num++; 286 *p++ = *num++; 287 break; 288 case 5: /* x0-1234 */ 289 case 4: /* x1234 */ 290 *p++ = 'x'; 291 *p++ = *num++; 292 break; 293 default: 294 return(num); 295 } 296 if (len != 4) { 297 *p++ = '-'; 298 *p++ = *num++; 299 } 300 *p++ = *num++; 301 *p++ = *num++; 302 *p++ = *num++; 303 *p = '\0'; 304 return(pbuf); 305 } 306 307 static void 308 find_idle_and_ttywrite(WHERE *w) 309 { 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