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