usr.bin/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  * @(#)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 }