adv_cmds/finger/util.c

   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
  37 #if 0
  38 #ifndef lint
  39 static char sccsid[] = "@(#)util.c      8.3 (Berkeley) 4/28/95";
  40 #endif
  41 #endif
  42
  43 #include <sys/cdefs.h>
  44 __FBSDID("$FreeBSD: src/usr.bin/finger/util.c,v 1.22 2005/09/19 10:11:47 dds Exp $");
  45
  46 #include <sys/param.h>
  47 #include <sys/socket.h>
  48 #include <sys/stat.h>
  49 #include <ctype.h>
  50 #include <db.h>
  51 #include <err.h>
  52 #include <errno.h>
  53 #include <fcntl.h>
  54 #include <paths.h>
  55 #include <pwd.h>
  56 #include <stdio.h>
  57 #include <stdlib.h>
  58 #include <string.h>
  59 #include <unistd.h>
  60 #include <utmpx.h>
  61 #include "finger.h"
  62 #include "pathnames.h"
  63
  64 static void      find_idle_and_ttywrite(WHERE *);
  65 static void      userinfo(PERSON *, struct passwd *);
  66 static WHERE    *walloc(PERSON *);
  67
  68 int
  69 match(struct passwd *pw, const char *user)
  70 {
  71         char *p, *t;
  72         char name[1024];
  73
  74         if (!strcasecmp(pw->pw_name, user))
  75                 return(1);
  76
  77         /*
  78          * XXX
  79          * Why do we skip asterisks!?!?
  80          */
  81         (void)strncpy(p = tbuf, pw->pw_gecos, sizeof(tbuf));
  82         tbuf[sizeof(tbuf) - 1] = '\0';
  83         if (*p == '*')
  84                 ++p;
  85
  86         /* Ampersands get replaced by the login name. */
  87         if ((p = strtok(p, ",")) == NULL)
  88                 return(0);
  89
  90         for (t = name; t < &name[sizeof(name) - 1] && (*t = *p) != '\0'; ++p) {
  91                 if (*t == '&') {
  92                         (void)strncpy(t, pw->pw_name,
  93                             sizeof(name) - (t - name));
  94                         name[sizeof(name) - 1] = '\0';
  95                         while (t < &name[sizeof(name) - 1] && *++t)
  96                                 continue;
  97                 } else {
  98                         ++t;
  99                 }
 100         }
 101         *t = '\0';
 102         for (t = name; (p = strtok(t, "\t ")) != NULL; t = NULL)
 103                 if (!strcasecmp(p, user))
 104                         return(1);
 105         return(0);
 106 }
 107
 108 void
 109 enter_lastlog(PERSON *pn)
 110 {
 111         WHERE *w;
 112         struct lastlogx l, *ll;
 113         char doit = 0;
 114
 115         if ((ll = getlastlogxbyname(pn->name, &l)) == NULL) {
 116                 bzero(&l, sizeof(l));
 117                 ll = &l;
 118         }
 119         if ((w = pn->whead) == NULL)
 120                 doit = 1;
 121         else if (ll->ll_tv.tv_sec != 0) {
 122                 /* if last login is earlier than some current login */
 123                 for (; !doit && w != NULL; w = w->next)
 124                         if (w->info == LOGGEDIN && w->loginat < ll->ll_tv.tv_sec)
 125                                 doit = 1;
 126                 /*
 127                  * and if it's not any of the current logins
 128                  * can't use time comparison because there may be a small
 129                  * discrepancy since login calls time() twice
 130                  */
 131                 for (w = pn->whead; doit && w != NULL; w = w->next)
 132                         if (w->info == LOGGEDIN &&
 133                             strncmp(w->tty, ll->ll_line, _UTX_LINESIZE) == 0)
 134                                 doit = 0;
 135         }
 136         if (doit) {
 137                 w = walloc(pn);
 138                 w->info = LASTLOG;
 139                 bcopy(ll->ll_line, w->tty, _UTX_LINESIZE);
 140                 w->tty[_UTX_LINESIZE] = 0;
 141                 bcopy(ll->ll_host, w->host, _UTX_HOSTSIZE);
 142                 w->host[_UTX_HOSTSIZE] = 0;
 143                 w->loginat = ll->ll_tv.tv_sec;
 144         }
 145 }
 146
 147 void
 148 enter_where(struct utmpx *ut, PERSON *pn)
 149 {
 150         WHERE *w;
 151
 152         w = walloc(pn);
 153         w->info = LOGGEDIN;
 154         bcopy(ut->ut_line, w->tty, _UTX_LINESIZE);
 155         w->tty[_UTX_LINESIZE] = 0;
 156         bcopy(ut->ut_host, w->host, _UTX_HOSTSIZE);
 157         w->host[_UTX_HOSTSIZE] = 0;
 158         w->loginat = (time_t)ut->ut_tv.tv_sec;
 159         find_idle_and_ttywrite(w);
 160 }
 161
 162 PERSON *
 163 enter_person(struct passwd *pw)
 164 {
 165         DBT data, key;
 166         PERSON *pn;
 167
 168         if (db == NULL &&
 169             (db = dbopen(NULL, O_RDWR, 0, DB_BTREE, NULL)) == NULL)
 170                 err(1, NULL);
 171
 172         key.data = pw->pw_name;
 173         key.size = strlen(pw->pw_name);
 174
 175         switch ((*db->get)(db, &key, &data, 0)) {
 176         case 0:
 177                 memmove(&pn, data.data, sizeof pn);
 178                 return (pn);
 179         default:
 180         case -1:
 181                 err(1, "db get");
 182                 /* NOTREACHED */
 183         case 1:
 184                 ++entries;
 185                 pn = palloc();
 186                 userinfo(pn, pw);
 187                 pn->whead = NULL;
 188
 189                 data.size = sizeof(PERSON *);
 190                 data.data = &pn;
 191                 if ((*db->put)(db, &key, &data, 0))
 192                         err(1, "db put");
 193                 return (pn);
 194         }
 195 }
 196
 197 PERSON *
 198 find_person(const char *name)
 199 {
 200         struct passwd *pw;
 201
 202         int cnt;
 203         DBT data, key;
 204         PERSON *p;
 205         char buf[_UTX_USERSIZE + 1];
 206
 207         if (!db)
 208                 return(NULL);
 209
 210         if ((pw = getpwnam(name)) && hide(pw))
 211                 return(NULL);
 212
 213         /* Name may be only _UTX_USERSIZE long and not NUL terminated. */
 214         for (cnt = 0; cnt < _UTX_USERSIZE && *name; ++name, ++cnt)
 215                 buf[cnt] = *name;
 216         buf[cnt] = '\0';
 217         key.data = buf;
 218         key.size = cnt;
 219
 220         if ((*db->get)(db, &key, &data, 0))
 221                 return (NULL);
 222         memmove(&p, data.data, sizeof p);
 223         return (p);
 224 }
 225
 226 PERSON *
 227 palloc(void)
 228 {
 229         PERSON *p;
 230
 231         if ((p = malloc(sizeof(PERSON))) == NULL)
 232                 err(1, NULL);
 233         return(p);
 234 }
 235
 236 static WHERE *
 237 walloc(PERSON *pn)
 238 {
 239         WHERE *w;
 240
 241         if ((w = malloc(sizeof(WHERE))) == NULL)
 242                 err(1, NULL);
 243         if (pn->whead == NULL)
 244                 pn->whead = pn->wtail = w;
 245         else {
 246                 pn->wtail->next = w;
 247                 pn->wtail = w;
 248         }
 249         w->next = NULL;
 250         return(w);
 251 }
 252
 253 char *
 254 prphone(char *num)
 255 {
 256         char *p;
 257         int len;
 258         static char pbuf[20];
 259
 260         /* don't touch anything if the user has their own formatting */
 261         for (p = num; *p; ++p)
 262                 if (!isdigit(*p))
 263                         return(num);
 264         len = p - num;
 265         p = pbuf;
 266         switch(len) {
 267         case 11:                        /* +0-123-456-7890 */
 268                 *p++ = '+';
 269                 *p++ = *num++;
 270                 *p++ = '-';
 271                 /* FALLTHROUGH */
 272         case 10:                        /* 012-345-6789 */
 273                 *p++ = *num++;
 274                 *p++ = *num++;
 275                 *p++ = *num++;
 276                 *p++ = '-';
 277                 /* FALLTHROUGH */
 278         case 7:                         /* 012-3456 */
 279                 *p++ = *num++;
 280                 *p++ = *num++;
 281                 *p++ = *num++;
 282                 break;
 283         case 5:                         /* x0-1234 */
 284         case 4:                         /* x1234 */
 285                 *p++ = 'x';
 286                 *p++ = *num++;
 287                 break;
 288         default:
 289                 return(num);
 290         }
 291         if (len != 4) {
 292             *p++ = '-';
 293             *p++ = *num++;
 294         }
 295         *p++ = *num++;
 296         *p++ = *num++;
 297         *p++ = *num++;
 298         *p = '\0';
 299         return(pbuf);
 300 }
 301
 302 static void
 303 find_idle_and_ttywrite(WHERE *w)
 304 {
 305         struct stat sb;
 306         time_t touched;
 307         int error;
 308
 309         (void)snprintf(tbuf, sizeof(tbuf), "%s/%s", _PATH_DEV, w->tty);
 310
 311         error = stat(tbuf, &sb);
 312         if (error < 0 && errno == ENOENT) {
 313                 /*
 314                  * The terminal listed is not actually a terminal (i.e.,
 315                  * ":0").  This is a failure, so we'll skip printing
 316                  * out the idle time, which is non-ideal but better
 317                  * than a bogus warning and idle time.
 318                  */
 319                 w->idletime = -1;
 320                 return;
 321         } else if (error < 0) {
 322                 warn("%s", tbuf);
 323                 w->idletime = -1;
 324                 return;
 325         }
 326         touched = sb.st_atime;
 327         if (touched < w->loginat) {
 328                 /* tty untouched since before login */
 329                 touched = w->loginat;
 330         }
 331         w->idletime = now < touched ? 0 : now - touched;
 332
 333 #define TALKABLE        0220            /* tty is writable if 220 mode */
 334         w->writable = ((sb.st_mode & TALKABLE) == TALKABLE);
 335 }
 336
 337 static void
 338 userinfo(PERSON *pn, struct passwd *pw)
 339 {
 340         char *p, *t;
 341         char *bp, name[1024];
 342         struct stat sb;
 343
 344         pn->realname = pn->office = pn->officephone = pn->homephone = NULL;
 345
 346         pn->uid = pw->pw_uid;
 347         if ((pn->name = strdup(pw->pw_name)) == NULL)
 348                 err(1, "strdup failed");
 349         if ((pn->dir = strdup(pw->pw_dir)) == NULL)
 350                 err(1, "strdup failed");
 351         if ((pn->shell = strdup(pw->pw_shell)) == NULL)
 352                 err(1, "strdup failed");
 353
 354         /* why do we skip asterisks!?!? */
 355         (void)strncpy(bp = tbuf, pw->pw_gecos, sizeof(tbuf));
 356         tbuf[sizeof(tbuf) - 1] = '\0';
 357         if (*bp == '*')
 358                 ++bp;
 359
 360         /* ampersands get replaced by the login name */
 361         if (!(p = strsep(&bp, ",")))
 362                 return;
 363         for (t = name; t < &name[sizeof(name) - 1] && (*t = *p) != '\0'; ++p) {
 364                 if (*t == '&') {
 365                         (void)strncpy(t, pw->pw_name,
 366                             sizeof(name) - (t - name));
 367                         name[sizeof(name) - 1] = '\0';
 368                         if (islower(*t))
 369                                 *t = toupper(*t);
 370                         while (t < &name[sizeof(name) - 1] && *++t)
 371                                 continue;
 372                 } else {
 373                         ++t;
 374                 }
 375         }
 376         *t = '\0';
 377         if ((pn->realname = strdup(name)) == NULL)
 378                 err(1, "strdup failed");
 379         pn->office = ((p = strsep(&bp, ",")) && *p) ?
 380             strdup(p) : NULL;
 381         pn->officephone = ((p = strsep(&bp, ",")) && *p) ?
 382             strdup(p) : NULL;
 383         pn->homephone = ((p = strsep(&bp, ",")) && *p) ?
 384             strdup(p) : NULL;
 385         (void)snprintf(tbuf, sizeof(tbuf), "%s/%s", _PATH_MAILDIR, pw->pw_name);
 386         pn->mailrecv = -1;              /* -1 == not_valid */
 387         if (stat(tbuf, &sb) < 0) {
 388                 if (errno != ENOENT) {
 389                         warn("%s", tbuf);
 390                         return;
 391                 }
 392         } else if (sb.st_size != 0) {
 393                 pn->mailrecv = sb.st_mtime;
 394                 pn->mailread = sb.st_atime;
 395         }
 396 }
 397
 398 /*
 399  * Is this user hiding from finger?
 400  * If ~<user>/.nofinger exists, return 1 (hide), else return 0 (nohide).
 401  * Nobody can hide from root.
 402  */
 403
 404 int
 405 hide(struct passwd *pw)
 406 {
 407         struct stat st;
 408         char buf[MAXPATHLEN];
 409
 410         if (invoker_root || !pw->pw_dir)
 411                 return 0;
 412
 413         snprintf(buf, sizeof(buf), "%s/%s", pw->pw_dir, _PATH_NOFINGER);
 414
 415         if (stat(buf, &st) == 0)
 416                 return 1;
 417
 418         return 0;
 419 }