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  * $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 }