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  * 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 /*
  38  * Luke Mewburn <lm@rmit.edu.au> added the following on 940622:
  39  *    - mail status ("No Mail", "Mail read:...", or "New Mail ...,
  40  *      Unread since ...".)
  41  *    - 4 digit phone extensions (3210 is printed as x3210.)
  42  *    - host/office toggling in short format with -h & -o.
  43  *    - short day names (`Tue' printed instead of `Jun 21' if the
  44  *      login time is < 6 days.
  45  */
  46
  47 #ifndef lint
  48 static const char copyright[] =
  49 "@(#) Copyright (c) 1989, 1993\n\
  50         The Regents of the University of California.  All rights reserved.\n";
  51 #endif /* not lint */
  52
  53 #if 0
  54 #ifndef lint
  55 static char sccsid[] = "@(#)finger.c    8.5 (Berkeley) 5/4/95";
  56 #endif
  57 #endif
  58
  59 #include <sys/cdefs.h>
  60 __FBSDID("$FreeBSD$");
  61
  62 /*
  63  * Finger prints out information about users.  It is not portable since
  64  * certain fields (e.g. the full user name, office, and phone numbers) are
  65  * extracted from the gecos field of the passwd file which other UNIXes
  66  * may not have or may use for other things.
  67  *
  68  * There are currently two output formats; the short format is one line
  69  * per user and displays login name, tty, login time, real name, idle time,
  70  * and either remote host information (default) or office location/phone
  71  * number, depending on if -h or -o is used respectively.
  72  * The long format gives the same information (in a more legible format) as
  73  * well as home directory, shell, mail info, and .plan/.project files.
  74  */
  75
  76 #include <sys/types.h>
  77 #include <sys/socket.h>
  78 #include <db.h>
  79 #include <err.h>
  80 #include <pwd.h>
  81 #include <stdio.h>
  82 #include <stdlib.h>
  83 #include <string.h>
  84 #include <time.h>
  85 #include <unistd.h>
  86 #include <utmp.h>
  87 #include <locale.h>
  88
  89 #include "finger.h"
  90 #include "pathnames.h"
  91
  92 DB *db;
  93 time_t now;
  94 int entries, gflag, kflag, lflag, mflag, pplan, sflag, oflag;
  95 sa_family_t family = PF_UNSPEC;
  96 int d_first = -1;
  97 char tbuf[1024];
  98 int invoker_root = 0;
  99
 100 static void loginlist(void);
 101 static int option(int, char **);
 102 static void usage(void);
 103 static void userlist(int, char **);
 104
 105 static int
 106 option(int argc, char **argv)
 107 {
 108         int ch;
 109
 110         optind = 1;             /* reset getopt */
 111
 112         while ((ch = getopt(argc, argv, "46gklmpsho")) != -1)
 113                 switch(ch) {
 114                 case '4':
 115                         family = AF_INET;
 116                         break;
 117                 case '6':
 118                         family = AF_INET6;
 119                         break;
 120                 case 'g':
 121                         gflag = 1;
 122                         break;
 123                 case 'k':
 124                         kflag = 1;              /* keep going without utmp */
 125                         break;
 126                 case 'l':
 127                         lflag = 1;              /* long format */
 128                         break;
 129                 case 'm':
 130                         mflag = 1;              /* force exact match of names */
 131                         break;
 132                 case 'p':
 133                         pplan = 1;              /* don't show .plan/.project */
 134                         break;
 135                 case 's':
 136                         sflag = 1;              /* short format */
 137                         break;
 138                 case 'h':
 139                         oflag = 0;              /* remote host info */
 140                         break;
 141                 case 'o':
 142                         oflag = 1;              /* office info */
 143                         break;
 144                 case '?':
 145                 default:
 146                         usage();
 147                 }
 148
 149         return optind;
 150 }
 151
 152 static void
 153 usage(void)
 154 {
 155         (void)fprintf(stderr,
 156             "usage: finger [-46gklmpsho] [user ...] [user@host ...]\n");
 157         exit(1);
 158 }
 159
 160 int
 161 main(int argc, char **argv)
 162 {
 163         int envargc, argcnt;
 164         char *envargv[3];
 165         struct passwd *pw;
 166         static char myname[] = "finger";
 167
 168         if (getuid() == 0 || geteuid() == 0) {
 169                 invoker_root = 1;
 170                 if ((pw = getpwnam(UNPRIV_NAME)) && pw->pw_uid > 0) {
 171                          setgid(pw->pw_gid);
 172                          setuid(pw->pw_uid);
 173                 } else {
 174                          setgid(UNPRIV_UGID);
 175                          setuid(UNPRIV_UGID);
 176                 }
 177         }
 178
 179         (void) setlocale(LC_ALL, "");
 180
 181                                 /* remove this line to get remote host */
 182         oflag = 1;              /* default to old "office" behavior */
 183
 184         /*
 185          * Process environment variables followed by command line arguments.
 186          */
 187         if ((envargv[1] = getenv("FINGER"))) {
 188                 envargc = 2;
 189                 envargv[0] = myname;
 190                 envargv[2] = NULL;
 191                 (void) option(envargc, envargv);
 192         }
 193
 194         argcnt = option(argc, argv);
 195         argc -= argcnt;
 196         argv += argcnt;
 197
 198         (void)time(&now);
 199         setpassent(1);
 200         if (!*argv) {
 201                 /*
 202                  * Assign explicit "small" format if no names given and -l
 203                  * not selected.  Force the -s BEFORE we get names so proper
 204                  * screening will be done.
 205                  */
 206                 if (!lflag)
 207                         sflag = 1;      /* if -l not explicit, force -s */
 208                 loginlist();
 209                 if (entries == 0)
 210                         (void)printf("No one logged on.\n");
 211         } else {
 212                 userlist(argc, argv);
 213                 /*
 214                  * Assign explicit "large" format if names given and -s not
 215                  * explicitly stated.  Force the -l AFTER we get names so any
 216                  * remote finger attempts specified won't be mishandled.
 217                  */
 218                 if (!sflag)
 219                         lflag = 1;      /* if -s not explicit, force -l */
 220         }
 221         if (entries) {
 222                 if (lflag)
 223                         lflag_print();
 224                 else
 225                         sflag_print();
 226         }
 227         return (0);
 228 }
 229
 230 static void
 231 loginlist(void)
 232 {
 233         PERSON *pn;
 234         DBT data, key;
 235         struct passwd *pw;
 236         struct utmp user;
 237         int r, sflag1;
 238         char name[UT_NAMESIZE + 1];
 239
 240         if (kflag)
 241                 errx(1, "can't list logins without reading utmp");
 242
 243         if (!freopen(_PATH_UTMP, "r", stdin))
 244                 err(1, "%s", _PATH_UTMP);
 245         name[UT_NAMESIZE] = '\0';
 246         while (fread((char *)&user, sizeof(user), 1, stdin) == 1) {
 247                 if (!user.ut_name[0])
 248                         continue;
 249                 if ((pn = find_person(user.ut_name)) == NULL) {
 250                         bcopy(user.ut_name, name, UT_NAMESIZE);
 251                         if ((pw = getpwnam(name)) == NULL)
 252                                 continue;
 253                         if (hide(pw))
 254                                 continue;
 255                         pn = enter_person(pw);
 256                 }
 257                 enter_where(&user, pn);
 258         }
 259         if (db && lflag)
 260                 for (sflag1 = R_FIRST;; sflag1 = R_NEXT) {
 261                         PERSON *tmp;
 262
 263                         r = (*db->seq)(db, &key, &data, sflag1);
 264                         if (r == -1)
 265                                 err(1, "db seq");
 266                         if (r == 1)
 267                                 break;
 268                         memmove(&tmp, data.data, sizeof tmp);
 269                         enter_lastlog(tmp);
 270                 }
 271 }
 272
 273 static void
 274 userlist(int argc, char **argv)
 275 {
 276         PERSON *pn;
 277         DBT data, key;
 278         struct utmp user;
 279         struct passwd *pw;
 280         int r, sflag1, *used, *ip;
 281         char **ap, **nargv, **np, **p;
 282         FILE *conf_fp;
 283         char conf_alias[LINE_MAX];
 284         char *conf_realname;
 285         int conf_length;
 286
 287         if ((nargv = malloc((argc+1) * sizeof(char *))) == NULL ||
 288             (used = calloc(argc, sizeof(int))) == NULL)
 289                 err(1, NULL);
 290
 291         /* Pull out all network requests. */
 292         for (ap = p = argv, np = nargv; *p; ++p)
 293                 if (index(*p, '@'))
 294                         *np++ = *p;
 295                 else
 296                         *ap++ = *p;
 297
 298         *np++ = NULL;
 299         *ap++ = NULL;
 300
 301         if (!*argv)
 302                 goto net;
 303
 304         /*
 305          * Mark any arguments beginning with '/' as invalid so that we
 306          * don't accidently confuse them with expansions from finger.conf
 307          */
 308         for (p = argv, ip = used; *p; ++p, ++ip)
 309             if (**p == '/') {
 310                 *ip = 1;
 311                 warnx("%s: no such user", *p);
 312             }
 313
 314         /*
 315          * Traverse the finger alias configuration file of the form
 316          * alias:(user|alias), ignoring comment lines beginning '#'.
 317          */
 318         if ((conf_fp = fopen(_PATH_FINGERCONF, "r")) != NULL) {
 319             while(fgets(conf_alias, sizeof(conf_alias), conf_fp) != NULL) {
 320                 conf_length = strlen(conf_alias);
 321                 if (*conf_alias == '#' || conf_alias[--conf_length] != '\n')
 322                     continue;
 323                 conf_alias[conf_length] = '\0';      /* Remove trailing LF */
 324                 if ((conf_realname = strchr(conf_alias, ':')) == NULL)
 325                     continue;
 326                 *conf_realname = '\0';               /* Replace : with NUL */
 327                 for (p = argv; *p; ++p) {
 328                     if (strcmp(*p, conf_alias) == 0) {
 329                         if ((*p = strdup(conf_realname+1)) == NULL) {
 330                             err(1, NULL);
 331                         }
 332                     }
 333                 }
 334             }
 335             (void)fclose(conf_fp);
 336         }
 337
 338         /*
 339          * Traverse the list of possible login names and check the login name
 340          * and real name against the name specified by the user. If the name
 341          * begins with a '/', try to read the file of that name instead of
 342          * gathering the traditional finger information.
 343          */
 344         if (mflag)
 345                 for (p = argv, ip = used; *p; ++p, ++ip) {
 346                         if (**p != '/' || *ip == 1 || !show_text("", *p, "")) {
 347                                 if (((pw = getpwnam(*p)) != NULL) && !hide(pw))
 348                                         enter_person(pw);
 349                                 else if (!*ip)
 350                                         warnx("%s: no such user", *p);
 351                         }
 352                 }
 353         else {
 354                 while ((pw = getpwent()) != NULL) {
 355                         for (p = argv, ip = used; *p; ++p, ++ip)
 356                                 if (**p == '/' && *ip != 1
 357                                     && show_text("", *p, ""))
 358                                         *ip = 1;
 359                                 else if (match(pw, *p) && !hide(pw)) {
 360                                         enter_person(pw);
 361                                         *ip = 1;
 362                                 }
 363                 }
 364                 for (p = argv, ip = used; *p; ++p, ++ip)
 365                         if (!*ip)
 366                                 warnx("%s: no such user", *p);
 367         }
 368
 369         /* Handle network requests. */
 370 net:    for (p = nargv; *p;) {
 371                 netfinger(*p++);
 372                 if (*p || entries)
 373                     printf("\n");
 374         }
 375
 376         if (entries == 0)
 377                 return;
 378
 379         if (kflag)
 380                 return;
 381
 382         /*
 383          * Scan thru the list of users currently logged in, saving
 384          * appropriate data whenever a match occurs.
 385          */
 386         if (!freopen(_PATH_UTMP, "r", stdin))
 387                 err(1, "%s", _PATH_UTMP);
 388         while (fread((char *)&user, sizeof(user), 1, stdin) == 1) {
 389                 if (!user.ut_name[0])
 390                         continue;
 391                 if ((pn = find_person(user.ut_name)) == NULL)
 392                         continue;
 393                 enter_where(&user, pn);
 394         }
 395         if (db)
 396                 for (sflag1 = R_FIRST;; sflag1 = R_NEXT) {
 397                         PERSON *tmp;
 398
 399                         r = (*db->seq)(db, &key, &data, sflag1);
 400                         if (r == -1)
 401                                 err(1, "db seq");
 402                         if (r == 1)
 403                                 break;
 404                         memmove(&tmp, data.data, sizeof tmp);
 405                         enter_lastlog(tmp);
 406                 }
 407 }