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. 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 * @(#)util.c 8.3 (Berkeley) 4/28/95 33 * $FreeBSD: src/usr.bin/finger/util.c,v 1.8.2.6 2002/07/03 01:14:24 des Exp $ 34 * $DragonFly: src/usr.bin/finger/util.c,v 1.3 2003/10/04 20:36:44 hmp Exp $ 35 */ 36 37 #include <sys/param.h> 38 #include <sys/socket.h> 39 #include <sys/stat.h> 40 #include <ctype.h> 41 #include <db.h> 42 #include <err.h> 43 #include <errno.h> 44 #include <fcntl.h> 45 #include <paths.h> 46 #include <pwd.h> 47 #include <stdio.h> 48 #include <stdlib.h> 49 #include <string.h> 50 #include <unistd.h> 51 #include "utmpentry.h" 52 #include <utmp.h> 53 #include "finger.h" 54 #include "pathnames.h" 55 56 static void find_idle_and_ttywrite(WHERE *); 57 static void userinfo(PERSON *, struct passwd *); 58 static WHERE *walloc(PERSON *); 59 60 int 61 match(struct passwd *pw, char *user) 62 { 63 char *p, *t; 64 char name[1024]; 65 66 if (!strcasecmp(pw->pw_name, user)) 67 return(1); 68 69 /* 70 * XXX 71 * Why do we skip asterisks!?!? 72 */ 73 (void)strncpy(p = tbuf, pw->pw_gecos, sizeof(tbuf)); 74 tbuf[sizeof(tbuf) - 1] = '\0'; 75 if (*p == '*') 76 ++p; 77 78 /* Ampersands get replaced by the login name. */ 79 if ((p = strtok(p, ",")) == NULL) 80 return(0); 81 82 for (t = name; t < &name[sizeof(name) - 1] && (*t = *p) != '\0'; ++p) { 83 if (*t == '&') { 84 (void)strncpy(t, pw->pw_name, 85 sizeof(name) - (t - name)); 86 name[sizeof(name) - 1] = '\0'; 87 while (t < &name[sizeof(name) - 1] && *++t) 88 continue; 89 } else { 90 ++t; 91 } 92 } 93 *t = '\0'; 94 for (t = name; (p = strtok(t, "\t ")) != NULL; t = NULL) 95 if (!strcasecmp(p, user)) 96 return(1); 97 return(0); 98 } 99 100 void 101 enter_lastlog(PERSON *pn) 102 { 103 WHERE *w; 104 static int opened, fd; 105 struct lastlog ll; 106 char doit = 0; 107 108 /* some systems may not maintain lastlog, don't report errors. */ 109 if (!opened) { 110 fd = open(_PATH_LASTLOG, O_RDONLY, 0); 111 opened = 1; 112 } 113 if (fd == -1 || 114 lseek(fd, (long)pn->uid * sizeof(ll), SEEK_SET) != 115 (off_t)((long)pn->uid * sizeof(ll)) || 116 read(fd, (char *)&ll, sizeof(ll)) != sizeof(ll)) { 117 /* as if never logged in */ 118 ll.ll_line[0] = ll.ll_host[0] = '\0'; 119 ll.ll_time = 0; 120 } 121 if ((w = pn->whead) == NULL) 122 doit = 1; 123 else if (ll.ll_time != 0) { 124 /* if last login is earlier than some current login */ 125 for (; !doit && w != NULL; w = w->next) 126 if (w->info == LOGGEDIN && w->loginat < ll.ll_time) 127 doit = 1; 128 /* 129 * and if it's not any of the current logins 130 * can't use time comparison because there may be a small 131 * discrepancy since login calls time() twice 132 */ 133 for (w = pn->whead; doit && w != NULL; w = w->next) 134 if (w->info == LOGGEDIN && 135 strncmp(w->tty, ll.ll_line, UT_LINESIZE) == 0) 136 doit = 0; 137 } 138 if (doit) { 139 w = walloc(pn); 140 w->info = LASTLOG; 141 asprintf(&w->tty, "%s", ll.ll_line); 142 asprintf(&w->host, "%s", ll.ll_host); 143 w->loginat = ll.ll_time; 144 } 145 } 146 147 void 148 enter_where(struct utmpentry *ep, PERSON *pn) 149 { 150 WHERE *w; 151 152 w = walloc(pn); 153 w->info = LOGGEDIN; 154 w->tty = ep->line; 155 w->host = ep->host; 156 w->loginat = (time_t)ep->tv.tv_sec; 157 find_idle_and_ttywrite(w); 158 } 159 160 PERSON * 161 enter_person(struct passwd *pw) 162 { 163 DBT data, key; 164 PERSON *pn; 165 166 if (db == NULL && 167 (db = dbopen(NULL, O_RDWR, 0, DB_BTREE, NULL)) == NULL) 168 err(1, NULL); 169 170 key.data = pw->pw_name; 171 key.size = strlen(pw->pw_name); 172 173 switch ((*db->get)(db, &key, &data, 0)) { 174 case 0: 175 memmove(&pn, data.data, sizeof pn); 176 return (pn); 177 default: 178 case -1: 179 err(1, "db get"); 180 /* NOTREACHED */ 181 case 1: 182 ++entries; 183 pn = palloc(); 184 userinfo(pn, pw); 185 pn->whead = NULL; 186 187 data.size = sizeof(PERSON *); 188 data.data = &pn; 189 if ((*db->put)(db, &key, &data, 0)) 190 err(1, "db put"); 191 return (pn); 192 } 193 } 194 195 PERSON * 196 find_person(char *name) 197 { 198 struct passwd *pw; 199 200 int cnt; 201 DBT data, key; 202 PERSON *p; 203 char buf[UT_NAMESIZE + 1]; 204 205 if (!db) 206 return(NULL); 207 208 if ((pw = getpwnam(name)) && hide(pw)) 209 return(NULL); 210 211 /* Name may be only UT_NAMESIZE long and not NUL terminated. */ 212 for (cnt = 0; cnt < UT_NAMESIZE && *name; ++name, ++cnt) 213 buf[cnt] = *name; 214 buf[cnt] = '\0'; 215 key.data = buf; 216 key.size = cnt; 217 218 if ((*db->get)(db, &key, &data, 0)) 219 return (NULL); 220 memmove(&p, data.data, sizeof p); 221 return (p); 222 } 223 224 PERSON * 225 palloc(void) 226 { 227 PERSON *p; 228 229 if ((p = malloc(sizeof(PERSON))) == NULL) 230 err(1, NULL); 231 return(p); 232 } 233 234 static WHERE * 235 walloc(PERSON *pn) 236 { 237 WHERE *w; 238 239 if ((w = malloc(sizeof(WHERE))) == NULL) 240 err(1, NULL); 241 bzero(w, sizeof(WHERE)); 242 if (pn->whead == NULL) { 243 pn->whead = pn->wtail = w; 244 } else { 245 pn->wtail->next = w; 246 pn->wtail = w; 247 } 248 w->next = NULL; 249 return(w); 250 } 251 252 char * 253 prphone(char *num) 254 { 255 char *p; 256 int len; 257 static char pbuf[20]; 258 259 /* don't touch anything if the user has their own formatting */ 260 for (p = num; *p; ++p) 261 if (!isdigit(*p)) 262 return(num); 263 len = p - num; 264 p = pbuf; 265 switch(len) { 266 case 11: /* +0-123-456-7890 */ 267 *p++ = '+'; 268 *p++ = *num++; 269 *p++ = '-'; 270 /* FALLTHROUGH */ 271 case 10: /* 012-345-6789 */ 272 *p++ = *num++; 273 *p++ = *num++; 274 *p++ = *num++; 275 *p++ = '-'; 276 /* FALLTHROUGH */ 277 case 7: /* 012-3456 */ 278 *p++ = *num++; 279 *p++ = *num++; 280 *p++ = *num++; 281 break; 282 case 5: /* x0-1234 */ 283 case 4: /* x1234 */ 284 *p++ = 'x'; 285 *p++ = *num++; 286 break; 287 default: 288 return(num); 289 } 290 if (len != 4) { 291 *p++ = '-'; 292 *p++ = *num++; 293 } 294 *p++ = *num++; 295 *p++ = *num++; 296 *p++ = *num++; 297 *p = '\0'; 298 return(pbuf); 299 } 300 301 static void 302 find_idle_and_ttywrite(WHERE *w) 303 { 304 struct stat sb; 305 time_t touched; 306 307 (void)snprintf(tbuf, sizeof(tbuf), "%s/%s", _PATH_DEV, w->tty); 308 if (stat(tbuf, &sb) < 0) { 309 warn("%s", tbuf); 310 return; 311 } 312 touched = sb.st_atime; 313 if (touched < w->loginat) { 314 /* tty untouched since before login */ 315 touched = w->loginat; 316 } 317 w->idletime = now < touched ? 0 : now - touched; 318 319 #define TALKABLE 0220 /* tty is writable if 220 mode */ 320 w->writable = ((sb.st_mode & TALKABLE) == TALKABLE); 321 } 322 323 static void 324 userinfo(PERSON *pn, struct passwd *pw) 325 { 326 char *p, *t; 327 char *bp, name[1024]; 328 struct stat sb; 329 330 pn->realname = pn->office = pn->officephone = pn->homephone = NULL; 331 332 pn->uid = pw->pw_uid; 333 if ((pn->name = strdup(pw->pw_name)) == NULL) 334 err(1, "strdup failed"); 335 if ((pn->dir = strdup(pw->pw_dir)) == NULL) 336 err(1, "strdup failed"); 337 if ((pn->shell = strdup(pw->pw_shell)) == NULL) 338 err(1, "strdup failed"); 339 340 /* why do we skip asterisks!?!? */ 341 (void)strncpy(bp = tbuf, pw->pw_gecos, sizeof(tbuf)); 342 tbuf[sizeof(tbuf) - 1] = '\0'; 343 if (*bp == '*') 344 ++bp; 345 346 /* ampersands get replaced by the login name */ 347 if (!(p = strsep(&bp, ","))) 348 return; 349 for (t = name; t < &name[sizeof(name) - 1] && (*t = *p) != '\0'; ++p) { 350 if (*t == '&') { 351 (void)strncpy(t, pw->pw_name, 352 sizeof(name) - (t - name)); 353 name[sizeof(name) - 1] = '\0'; 354 if (islower(*t)) 355 *t = toupper(*t); 356 while (t < &name[sizeof(name) - 1] && *++t) 357 continue; 358 } else { 359 ++t; 360 } 361 } 362 *t = '\0'; 363 if ((pn->realname = strdup(name)) == NULL) 364 err(1, "strdup failed"); 365 pn->office = ((p = strsep(&bp, ",")) && *p) ? 366 strdup(p) : NULL; 367 pn->officephone = ((p = strsep(&bp, ",")) && *p) ? 368 strdup(p) : NULL; 369 pn->homephone = ((p = strsep(&bp, ",")) && *p) ? 370 strdup(p) : NULL; 371 (void)snprintf(tbuf, sizeof(tbuf), "%s/%s", _PATH_MAILDIR, pw->pw_name); 372 pn->mailrecv = -1; /* -1 == not_valid */ 373 if (stat(tbuf, &sb) < 0) { 374 if (errno != ENOENT) { 375 warn("%s", tbuf); 376 return; 377 } 378 } else if (sb.st_size != 0) { 379 pn->mailrecv = sb.st_mtime; 380 pn->mailread = sb.st_atime; 381 } 382 } 383 384 /* 385 * Is this user hiding from finger? 386 * If ~<user>/.nofinger exists, return 1 (hide), else return 0 (nohide). 387 */ 388 389 int 390 hide(struct passwd *pw) 391 { 392 struct stat st; 393 char buf[MAXPATHLEN]; 394 395 if (!pw->pw_dir) 396 return 0; 397 398 snprintf(buf, sizeof(buf), "%s/%s", pw->pw_dir, _PATH_NOFINGER); 399 400 if (stat(buf, &st) == 0) 401 return 1; 402 403 return 0; 404 } 405