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
  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("$FreeBSD$");
  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 <utmp.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         static int opened, fd;
 113         struct lastlog ll;
 114         char doit = 0;
 115
 116         /* some systems may not maintain lastlog, don't report errors. */
 117         if (!opened) {
 118                 fd = open(_PATH_LASTLOG, O_RDONLY, 0);
 119                 opened = 1;
 120         }
 121         if (fd == -1 ||
 122             lseek(fd, (long)pn->uid * sizeof(ll), SEEK_SET) !=
 123             (long)pn->uid * sizeof(ll) ||
 124             read(fd, (char *)&ll, sizeof(ll)) != sizeof(ll)) {
 125                         /* as if never logged in */
 126                         ll.ll_line[0] = ll.ll_host[0] = '\0';
 127                         ll.ll_time = 0;
 128                 }
 129         if ((w = pn->whead) == NULL)
 130                 doit = 1;
 131         else if (ll.ll_time != 0) {
 132                 /* if last login is earlier than some current login */
 133                 for (; !doit && w != NULL; w = w->next)
 134                         if (w->info == LOGGEDIN && w->loginat < ll.ll_time)
 135                                 doit = 1;
 136                 /*
 137                  * and if it's not any of the current logins
 138                  * can't use time comparison because there may be a small
 139                  * discrepancy since login calls time() twice
 140                  */
 141                 for (w = pn->whead; doit && w != NULL; w = w->next)
 142                         if (w->info == LOGGEDIN &&
 143                             strncmp(w->tty, ll.ll_line, UT_LINESIZE) == 0)
 144                                 doit = 0;
 145         }
 146         if (doit) {
 147                 w = walloc(pn);
 148                 w->info = LASTLOG;
 149                 bcopy(ll.ll_line, w->tty, UT_LINESIZE);
 150                 w->tty[UT_LINESIZE] = 0;
 151                 bcopy(ll.ll_host, w->host, UT_HOSTSIZE);
 152                 w->host[UT_HOSTSIZE] = 0;
 153                 w->loginat = ll.ll_time;
 154         }
 155 }
 156
 157 void
 158 enter_where(struct utmp *ut, PERSON *pn)
 159 {
 160         WHERE *w;
 161
 162         w = walloc(pn);
 163         w->info = LOGGEDIN;
 164         bcopy(ut->ut_line, w->tty, UT_LINESIZE);
 165         w->tty[UT_LINESIZE] = 0;
 166         bcopy(ut->ut_host, w->host, UT_HOSTSIZE);
 167         w->host[UT_HOSTSIZE] = 0;
 168         w->loginat = (time_t)ut->ut_time;
 169         find_idle_and_ttywrite(w);
 170 }
 171
 172 PERSON *
 173 enter_person(struct passwd *pw)
 174 {
 175         DBT data, key;
 176         PERSON *pn;
 177
 178         if (db == NULL &&
 179             (db = dbopen(NULL, O_RDWR, 0, DB_BTREE, NULL)) == NULL)
 180                 err(1, NULL);
 181
 182         key.data = pw->pw_name;
 183         key.size = strlen(pw->pw_name);
 184
 185         switch ((*db->get)(db, &key, &data, 0)) {
 186         case 0:
 187                 memmove(&pn, data.data, sizeof pn);
 188                 return (pn);
 189         default:
 190         case -1:
 191                 err(1, "db get");
 192                 /* NOTREACHED */
 193         case 1:
 194                 ++entries;
 195                 pn = palloc();
 196                 userinfo(pn, pw);
 197                 pn->whead = NULL;
 198
 199                 data.size = sizeof(PERSON *);
 200                 data.data = &pn;
 201                 if ((*db->put)(db, &key, &data, 0))
 202                         err(1, "db put");
 203                 return (pn);
 204         }
 205 }
 206
 207 PERSON *
 208 find_person(const char *name)
 209 {
 210         struct passwd *pw;
 211
 212         int cnt;
 213         DBT data, key;
 214         PERSON *p;
 215         char buf[UT_NAMESIZE + 1];
 216
 217         if (!db)
 218                 return(NULL);
 219
 220         if ((pw = getpwnam(name)) && hide(pw))
 221                 return(NULL);
 222
 223         /* Name may be only UT_NAMESIZE long and not NUL terminated. */
 224         for (cnt = 0; cnt < UT_NAMESIZE && *name; ++name, ++cnt)
 225                 buf[cnt] = *name;
 226         buf[cnt] = '\0';
 227         key.data = buf;
 228         key.size = cnt;
 229
 230         if ((*db->get)(db, &key, &data, 0))
 231                 return (NULL);
 232         memmove(&p, data.data, sizeof p);
 233         return (p);
 234 }
 235
 236 PERSON *
 237 palloc(void)
 238 {
 239         PERSON *p;
 240
 241         if ((p = malloc(sizeof(PERSON))) == NULL)
 242                 err(1, NULL);
 243         return(p);
 244 }
 245
 246 static WHERE *
 247 walloc(PERSON *pn)
 248 {
 249         WHERE *w;
 250
 251         if ((w = malloc(sizeof(WHERE))) == NULL)
 252                 err(1, NULL);
 253         if (pn->whead == NULL)
 254                 pn->whead = pn->wtail = w;
 255         else {
 256                 pn->wtail->next = w;
 257                 pn->wtail = w;
 258         }
 259         w->next = NULL;
 260         return(w);
 261 }
 262
 263 char *
 264 prphone(char *num)
 265 {
 266         char *p;
 267         int len;
 268         static char pbuf[20];
 269
 270         /* don't touch anything if the user has their own formatting */
 271         for (p = num; *p; ++p)
 272                 if (!isdigit(*p))
 273                         return(num);
 274         len = p - num;
 275         p = pbuf;
 276         switch(len) {
 277         case 11:                        /* +0-123-456-7890 */
 278                 *p++ = '+';
 279                 *p++ = *num++;
 280                 *p++ = '-';
 281                 /* FALLTHROUGH */
 282         case 10:                        /* 012-345-6789 */
 283                 *p++ = *num++;
 284                 *p++ = *num++;
 285                 *p++ = *num++;
 286                 *p++ = '-';
 287                 /* FALLTHROUGH */
 288         case 7:                         /* 012-3456 */
 289                 *p++ = *num++;
 290                 *p++ = *num++;
 291                 *p++ = *num++;
 292                 break;
 293         case 5:                         /* x0-1234 */
 294         case 4:                         /* x1234 */
 295                 *p++ = 'x';
 296                 *p++ = *num++;
 297                 break;
 298         default:
 299                 return(num);
 300         }
 301         if (len != 4) {
 302             *p++ = '-';
 303             *p++ = *num++;
 304         }
 305         *p++ = *num++;
 306         *p++ = *num++;
 307         *p++ = *num++;
 308         *p = '\0';
 309         return(pbuf);
 310 }
 311
 312 static void
 313 find_idle_and_ttywrite(WHERE *w)
 314 {
 315         struct stat sb;
 316         time_t touched;
 317         int error;
 318
 319         (void)snprintf(tbuf, sizeof(tbuf), "%s/%s", _PATH_DEV, w->tty);
 320
 321         error = stat(tbuf, &sb);
 322         if (error < 0 && errno == ENOENT) {
 323                 /*
 324                  * The terminal listed is not actually a terminal (i.e.,
 325                  * ":0").  This is a failure, so we'll skip printing
 326                  * out the idle time, which is non-ideal but better
 327                  * than a bogus warning and idle time.
 328                  */
 329                 w->idletime = -1;
 330                 return;
 331         } else if (error < 0) {
 332                 warn("%s", tbuf);
 333                 w->idletime = -1;
 334                 return;
 335         }
 336         touched = sb.st_atime;
 337         if (touched < w->loginat) {
 338                 /* tty untouched since before login */
 339                 touched = w->loginat;
 340         }
 341         w->idletime = now < touched ? 0 : now - touched;
 342
 343 #define TALKABLE        0220            /* tty is writable if 220 mode */
 344         w->writable = ((sb.st_mode & TALKABLE) == TALKABLE);
 345 }
 346
 347 static void
 348 userinfo(PERSON *pn, struct passwd *pw)
 349 {
 350         char *p, *t;
 351         char *bp, name[1024];
 352         struct stat sb;
 353
 354         pn->realname = pn->office = pn->officephone = pn->homephone = NULL;
 355
 356         pn->uid = pw->pw_uid;
 357         if ((pn->name = strdup(pw->pw_name)) == NULL)
 358                 err(1, "strdup failed");
 359         if ((pn->dir = strdup(pw->pw_dir)) == NULL)
 360                 err(1, "strdup failed");
 361         if ((pn->shell = strdup(pw->pw_shell)) == NULL)
 362                 err(1, "strdup failed");
 363
 364         /* why do we skip asterisks!?!? */
 365         (void)strncpy(bp = tbuf, pw->pw_gecos, sizeof(tbuf));
 366         tbuf[sizeof(tbuf) - 1] = '\0';
 367         if (*bp == '*')
 368                 ++bp;
 369
 370         /* ampersands get replaced by the login name */
 371         if (!(p = strsep(&bp, ",")))
 372                 return;
 373         for (t = name; t < &name[sizeof(name) - 1] && (*t = *p) != '\0'; ++p) {
 374                 if (*t == '&') {
 375                         (void)strncpy(t, pw->pw_name,
 376                             sizeof(name) - (t - name));
 377                         name[sizeof(name) - 1] = '\0';
 378                         if (islower(*t))
 379                                 *t = toupper(*t);
 380                         while (t < &name[sizeof(name) - 1] && *++t)
 381                                 continue;
 382                 } else {
 383                         ++t;
 384                 }
 385         }
 386         *t = '\0';
 387         if ((pn->realname = strdup(name)) == NULL)
 388                 err(1, "strdup failed");
 389         pn->office = ((p = strsep(&bp, ",")) && *p) ?
 390             strdup(p) : NULL;
 391         pn->officephone = ((p = strsep(&bp, ",")) && *p) ?
 392             strdup(p) : NULL;
 393         pn->homephone = ((p = strsep(&bp, ",")) && *p) ?
 394             strdup(p) : NULL;
 395         (void)snprintf(tbuf, sizeof(tbuf), "%s/%s", _PATH_MAILDIR, pw->pw_name);
 396         pn->mailrecv = -1;              /* -1 == not_valid */
 397         if (stat(tbuf, &sb) < 0) {
 398                 if (errno != ENOENT) {
 399                         warn("%s", tbuf);
 400                         return;
 401                 }
 402         } else if (sb.st_size != 0) {
 403                 pn->mailrecv = sb.st_mtime;
 404                 pn->mailread = sb.st_atime;
 405         }
 406 }
 407
 408 /*
 409  * Is this user hiding from finger?
 410  * If ~<user>/.nofinger exists, return 1 (hide), else return 0 (nohide).
 411  * Nobody can hide from root.
 412  */
 413
 414 int
 415 hide(struct passwd *pw)
 416 {
 417         struct stat st;
 418         char buf[MAXPATHLEN];
 419
 420         if (invoker_root || !pw->pw_dir)
 421                 return 0;
 422
 423         snprintf(buf, sizeof(buf), "%s/%s", pw->pw_dir, _PATH_NOFINGER);
 424
 425         if (stat(buf, &st) == 0)
 426                 return 1;
 427
 428         return 0;
 429 }