usr.bin/finger/finger.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  * 4. 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
  33 /*
  34  * Luke Mewburn <lm@rmit.edu.au> added the following on 940622:
  35  *    - mail status ("No Mail", "Mail read:...", or "New Mail ...,
  36  *      Unread since ...".)
  37  *    - 4 digit phone extensions (3210 is printed as x3210.)
  38  *    - host/office toggling in short format with -h & -o.
  39  *    - short day names (`Tue' printed instead of `Jun 21' if the
  40  *      login time is < 6 days.
  41  */
  42
  43 #ifndef lint
  44 static const char copyright[] =
  45 "@(#) Copyright (c) 1989, 1993\n\
  46         The Regents of the University of California.  All rights reserved.\n";
  47 #endif /* not lint */
  48
  49 #if 0
  50 #ifndef lint
  51 static char sccsid[] = "@(#)finger.c    8.5 (Berkeley) 5/4/95";
  52 #endif
  53 #endif
  54
  55 #include <sys/cdefs.h>
  56 __FBSDID("$FreeBSD$");
  57
  58 /*
  59  * Finger prints out information about users.  It is not portable since
  60  * certain fields (e.g. the full user name, office, and phone numbers) are
  61  * extracted from the gecos field of the passwd file which other UNIXes
  62  * may not have or may use for other things.
  63  *
  64  * There are currently two output formats; the short format is one line
  65  * per user and displays login name, tty, login time, real name, idle time,
  66  * and either remote host information (default) or office location/phone
  67  * number, depending on if -h or -o is used respectively.
  68  * The long format gives the same information (in a more legible format) as
  69  * well as home directory, shell, mail info, and .plan/.project files.
  70  */
  71
  72 #include <sys/types.h>
  73 #include <sys/socket.h>
  74 #include <db.h>
  75 #include <err.h>
  76 #include <pwd.h>
  77 #include <stdio.h>
  78 #include <stdlib.h>
  79 #include <string.h>
  80 #include <time.h>
  81 #include <unistd.h>
  82 #include <utmpx.h>
  83 #include <locale.h>
  84
  85 #include "finger.h"
  86 #include "pathnames.h"
  87
  88 DB *db;
  89 time_t now;
  90 static int kflag, mflag, sflag;
  91 int entries, gflag, lflag, pplan, oflag;
  92 sa_family_t family = PF_UNSPEC;
  93 int d_first = -1;
  94 char tbuf[1024];
  95 int invoker_root = 0;
  96
  97 static void loginlist(void);
  98 static int option(int, char **);
  99 static void usage(void);
 100 static void userlist(int, char **);
 101
 102 static int
 103 option(int argc, char **argv)
 104 {
 105         int ch;
 106
 107         optind = 1;             /* reset getopt */
 108
 109         while ((ch = getopt(argc, argv, "46gklmpsho")) != -1)
 110                 switch(ch) {
 111                 case '4':
 112                         family = AF_INET;
 113                         break;
 114                 case '6':
 115                         family = AF_INET6;
 116                         break;
 117                 case 'g':
 118                         gflag = 1;
 119                         break;
 120                 case 'k':
 121                         kflag = 1;              /* keep going without utmp */
 122                         break;
 123                 case 'l':
 124                         lflag = 1;              /* long format */
 125                         break;
 126                 case 'm':
 127                         mflag = 1;              /* force exact match of names */
 128                         break;
 129                 case 'p':
 130                         pplan = 1;              /* don't show .plan/.project */
 131                         break;
 132                 case 's':
 133                         sflag = 1;              /* short format */
 134                         break;
 135                 case 'h':
 136                         oflag = 0;              /* remote host info */
 137                         break;
 138                 case 'o':
 139                         oflag = 1;              /* office info */
 140                         break;
 141                 case '?':
 142                 default:
 143                         usage();
 144                 }
 145
 146         return optind;
 147 }
 148
 149 static void
 150 usage(void)
 151 {
 152         (void)fprintf(stderr,
 153             "usage: finger [-46gklmpsho] [user ...] [user@host ...]\n");
 154         exit(1);
 155 }
 156
 157 int
 158 main(int argc, char **argv)
 159 {
 160         int envargc, argcnt;
 161         char *envargv[3];
 162         struct passwd *pw;
 163         static char myname[] = "finger";
 164
 165         if (getuid() == 0 || geteuid() == 0) {
 166                 invoker_root = 1;
 167                 if ((pw = getpwnam(UNPRIV_NAME)) && pw->pw_uid > 0) {
 168                         if (setgid(pw->pw_gid) != 0)
 169                                 err(1, "setgid()");
 170                         if (setuid(pw->pw_uid) != 0)
 171                                 err(1, "setuid()");
 172                 } else {
 173                         if (setgid(UNPRIV_UGID) != 0)
 174                                 err(1, "setgid()");
 175                         if (setuid(UNPRIV_UGID) != 0)
 176                                 err(1, "setuid()");
 177                 }
 178         }
 179
 180         (void) setlocale(LC_ALL, "");
 181
 182                                 /* remove this line to get remote host */
 183         oflag = 1;              /* default to old "office" behavior */
 184
 185         /*
 186          * Process environment variables followed by command line arguments.
 187          */
 188         if ((envargv[1] = getenv("FINGER"))) {
 189                 envargc = 2;
 190                 envargv[0] = myname;
 191                 envargv[2] = NULL;
 192                 (void) option(envargc, envargv);
 193         }
 194
 195         argcnt = option(argc, argv);
 196         argc -= argcnt;
 197         argv += argcnt;
 198
 199         (void)time(&now);
 200         setpassent(1);
 201         if (!*argv) {
 202                 /*
 203                  * Assign explicit "small" format if no names given and -l
 204                  * not selected.  Force the -s BEFORE we get names so proper
 205                  * screening will be done.
 206                  */
 207                 if (!lflag)
 208                         sflag = 1;      /* if -l not explicit, force -s */
 209                 loginlist();
 210                 if (entries == 0)
 211                         (void)printf("No one logged on.\n");
 212         } else {
 213                 userlist(argc, argv);
 214                 /*
 215                  * Assign explicit "large" format if names given and -s not
 216                  * explicitly stated.  Force the -l AFTER we get names so any
 217                  * remote finger attempts specified won't be mishandled.
 218                  */
 219                 if (!sflag)
 220                         lflag = 1;      /* if -s not explicit, force -l */
 221         }
 222         if (entries) {
 223                 if (lflag)
 224                         lflag_print();
 225                 else
 226                         sflag_print();
 227         }
 228         return (0);
 229 }
 230
 231 static void
 232 loginlist(void)
 233 {
 234         PERSON *pn;
 235         DBT data, key;
 236         struct passwd *pw;
 237         struct utmpx *user;
 238         int r, sflag1;
 239
 240         if (kflag)
 241                 errx(1, "can't list logins without reading utmp");
 242
 243         setutxent();
 244         while ((user = getutxent()) != NULL) {
 245                 if (user->ut_type != USER_PROCESS)
 246                         continue;
 247                 if ((pn = find_person(user->ut_user)) == NULL) {
 248                         if ((pw = getpwnam(user->ut_user)) == NULL)
 249                                 continue;
 250                         if (hide(pw))
 251                                 continue;
 252                         pn = enter_person(pw);
 253                 }
 254                 enter_where(user, pn);
 255         }
 256         endutxent();
 257         if (db && lflag)
 258                 for (sflag1 = R_FIRST;; sflag1 = R_NEXT) {
 259                         PERSON *tmp;
 260
 261                         r = (*db->seq)(db, &key, &data, sflag1);
 262                         if (r == -1)
 263                                 err(1, "db seq");
 264                         if (r == 1)
 265                                 break;
 266                         memmove(&tmp, data.data, sizeof tmp);
 267                         enter_lastlog(tmp);
 268                 }
 269 }
 270
 271 static void
 272 userlist(int argc, char **argv)
 273 {
 274         PERSON *pn;
 275         DBT data, key;
 276         struct utmpx *user;
 277         struct passwd *pw;
 278         int r, sflag1, *used, *ip;
 279         char **ap, **nargv, **np, **p;
 280         FILE *conf_fp;
 281         char conf_alias[LINE_MAX];
 282         char *conf_realname;
 283         int conf_length;
 284
 285         if ((nargv = malloc((argc+1) * sizeof(char *))) == NULL ||
 286             (used = calloc(argc, sizeof(int))) == NULL)
 287                 err(1, NULL);
 288
 289         /* Pull out all network requests. */
 290         for (ap = p = argv, np = nargv; *p; ++p)
 291                 if (strchr(*p, '@'))
 292                         *np++ = *p;
 293                 else
 294                         *ap++ = *p;
 295
 296         *np++ = NULL;
 297         *ap++ = NULL;
 298
 299         if (!*argv)
 300                 goto net;
 301
 302         /*
 303          * Mark any arguments beginning with '/' as invalid so that we
 304          * don't accidentally confuse them with expansions from finger.conf
 305          */
 306         for (p = argv, ip = used; *p; ++p, ++ip)
 307             if (**p == '/') {
 308                 *ip = 1;
 309                 warnx("%s: no such user", *p);
 310             }
 311
 312         /*
 313          * Traverse the finger alias configuration file of the form
 314          * alias:(user|alias), ignoring comment lines beginning '#'.
 315          */
 316         if ((conf_fp = fopen(_PATH_FINGERCONF, "r")) != NULL) {
 317             while(fgets(conf_alias, sizeof(conf_alias), conf_fp) != NULL) {
 318                 conf_length = strlen(conf_alias);
 319                 if (*conf_alias == '#' || conf_alias[--conf_length] != '\n')
 320                     continue;
 321                 conf_alias[conf_length] = '\0';      /* Remove trailing LF */
 322                 if ((conf_realname = strchr(conf_alias, ':')) == NULL)
 323                     continue;
 324                 *conf_realname = '\0';               /* Replace : with NUL */
 325                 for (p = argv; *p; ++p) {
 326                     if (strcmp(*p, conf_alias) == 0) {
 327                         if ((*p = strdup(conf_realname+1)) == NULL) {
 328                             err(1, NULL);
 329                         }
 330                     }
 331                 }
 332             }
 333             (void)fclose(conf_fp);
 334         }
 335
 336         /*
 337          * Traverse the list of possible login names and check the login name
 338          * and real name against the name specified by the user. If the name
 339          * begins with a '/', try to read the file of that name instead of
 340          * gathering the traditional finger information.
 341          */
 342         if (mflag)
 343                 for (p = argv, ip = used; *p; ++p, ++ip) {
 344                         if (**p != '/' || *ip == 1 || !show_text("", *p, "")) {
 345                                 if (((pw = getpwnam(*p)) != NULL) && !hide(pw))
 346                                         enter_person(pw);
 347                                 else if (!*ip)
 348                                         warnx("%s: no such user", *p);
 349                         }
 350                 }
 351         else {
 352                 while ((pw = getpwent()) != NULL) {
 353                         for (p = argv, ip = used; *p; ++p, ++ip)
 354                                 if (**p == '/' && *ip != 1
 355                                     && show_text("", *p, ""))
 356                                         *ip = 1;
 357                                 else if (match(pw, *p) && !hide(pw)) {
 358                                         enter_person(pw);
 359                                         *ip = 1;
 360                                 }
 361                 }
 362                 for (p = argv, ip = used; *p; ++p, ++ip)
 363                         if (!*ip)
 364                                 warnx("%s: no such user", *p);
 365         }
 366
 367         /* Handle network requests. */
 368 net:    for (p = nargv; *p;) {
 369                 netfinger(*p++);
 370                 if (*p || entries)
 371                     printf("\n");
 372         }
 373
 374         free(used);
 375         if (entries == 0)
 376                 return;
 377
 378         if (kflag)
 379                 return;
 380
 381         /*
 382          * Scan thru the list of users currently logged in, saving
 383          * appropriate data whenever a match occurs.
 384          */
 385         setutxent();
 386         while ((user = getutxent()) != NULL) {
 387                 if (user->ut_type != USER_PROCESS)
 388                         continue;
 389                 if ((pn = find_person(user->ut_user)) == NULL)
 390                         continue;
 391                 enter_where(user, pn);
 392         }
 393         endutxent();
 394         if (db)
 395                 for (sflag1 = R_FIRST;; sflag1 = R_NEXT) {
 396                         PERSON *tmp;
 397
 398                         r = (*db->seq)(db, &key, &data, sflag1);
 399                         if (r == -1)
 400                                 err(1, "db seq");
 401                         if (r == 1)
 402                                 break;
 403                         memmove(&tmp, data.data, sizeof tmp);
 404                         enter_lastlog(tmp);
 405                 }
 406 }