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  * @(#) Copyright (c) 1989, 1993 The Regents of the University of California.  All rights reserved.
  37  * @(#)finger.c 8.5 (Berkeley) 5/4/95
  38  * $FreeBSD: src/usr.bin/finger/finger.c,v 1.15.2.9 2002/07/29 18:52:52 ume Exp $
  39  * $DragonFly: src/usr.bin/finger/finger.c,v 1.6 2008/06/05 18:06:33 swildner Exp $
  40  */
  41
  42 /*
  43  * Luke Mewburn <lm@rmit.edu.au> added the following on 940622:
  44  *    - mail status ("No Mail", "Mail read:...", or "New Mail ...,
  45  *      Unread since ...".)
  46  *    - 4 digit phone extensions (3210 is printed as x3210.)
  47  *    - host/office toggling in short format with -h & -o.
  48  *    - short day names (`Tue' printed instead of `Jun 21' if the
  49  *      login time is < 6 days.
  50  */
  51
  52 /*
  53  * Finger prints out information about users.  It is not portable since
  54  * certain fields (e.g. the full user name, office, and phone numbers) are
  55  * extracted from the gecos field of the passwd file which other UNIXes
  56  * may not have or may use for other things.
  57  *
  58  * There are currently two output formats; the short format is one line
  59  * per user and displays login name, tty, login time, real name, idle time,
  60  * and either remote host information (default) or office location/phone
  61  * number, depending on if -h or -o is used respectively.
  62  * The long format gives the same information (in a more legible format) as
  63  * well as home directory, shell, mail info, and .plan/.project files.
  64  */
  65
  66 #include <sys/types.h>
  67 #include <sys/socket.h>
  68 #include <db.h>
  69 #include <err.h>
  70 #include <pwd.h>
  71 #include <stdio.h>
  72 #include <stdlib.h>
  73 #include <string.h>
  74 #include <time.h>
  75 #include <unistd.h>
  76 #include <utmp.h>
  77 #include <locale.h>
  78
  79 #include "finger.h"
  80 #include "pathnames.h"
  81
  82 DB *db;
  83 time_t now;
  84 int entries, gflag, lflag, mflag, pplan, sflag, oflag, Tflag, eightflag;
  85 sa_family_t family = PF_UNSPEC;
  86 int d_first = -1;
  87 char tbuf[1024];
  88
  89 static void loginlist(void);
  90 static int option(int, char **);
  91 static void usage(void);
  92 static void userlist(int, char **);
  93
  94 static int
  95 option(int argc, char **argv)
  96 {
  97         int ch;
  98
  99         optind = 1;             /* reset getopt */
 100
 101         while ((ch = getopt(argc, argv, "468glmpshoT")) != -1)
 102                 switch(ch) {
 103                 case '4':
 104                         family = AF_INET;
 105                         break;
 106                 case '6':
 107                         family = AF_INET6;
 108                         break;
 109                 case '8':
 110                         eightflag = 1;          /* allow 8-bit passthrough */
 111                         break;
 112                 case 'g':
 113                         gflag = 1;
 114                         break;
 115                 case 'l':
 116                         lflag = 1;              /* long format */
 117                         break;
 118                 case 'm':
 119                         mflag = 1;              /* force exact match of names */
 120                         break;
 121                 case 'p':
 122                         pplan = 1;              /* don't show .plan/.project */
 123                         break;
 124                 case 's':
 125                         sflag = 1;              /* short format */
 126                         break;
 127                 case 'h':
 128                         oflag = 0;              /* remote host info */
 129                         break;
 130                 case 'o':
 131                         oflag = 1;              /* office info */
 132                         break;
 133                 case 'T':
 134                         Tflag = 1;              /* disable T/TCP */
 135                         break;
 136                 case '?':
 137                 default:
 138                         usage();
 139                 }
 140
 141         return optind;
 142 }
 143
 144 static void
 145 usage(void)
 146 {
 147         fprintf(stderr, "usage: finger [-468lmpshoT] [login ...]\n");
 148         exit(1);
 149 }
 150
 151 int
 152 main(int argc, char **argv)
 153 {
 154         int envargc, argcnt;
 155         char *envargv[3];
 156         struct passwd *pw;
 157         static char myname[] = "finger";
 158
 159         if (getuid() == 0 || geteuid() == 0) {
 160                 if ((pw = getpwnam(UNPRIV_NAME)) && pw->pw_uid > 0) {
 161                          setgid(pw->pw_gid);
 162                          setuid(pw->pw_uid);
 163                 } else {
 164                          setgid(UNPRIV_UGID);
 165                          setuid(UNPRIV_UGID);
 166                 }
 167         }
 168
 169         (void) setlocale(LC_ALL, "");
 170
 171                                 /* remove this line to get remote host */
 172         oflag = 1;              /* default to old "office" behavior */
 173
 174         /*
 175          * Process environment variables followed by command line arguments.
 176          */
 177         if ((envargv[1] = getenv("FINGER"))) {
 178                 envargc = 2;
 179                 envargv[0] = myname;
 180                 envargv[2] = NULL;
 181                 option(envargc, envargv);
 182         }
 183
 184         argcnt = option(argc, argv);
 185         argc -= argcnt;
 186         argv += argcnt;
 187
 188         time(&now);
 189         setpassent(1);
 190         if (!*argv) {
 191                 /*
 192                  * Assign explicit "small" format if no names given and -l
 193                  * not selected.  Force the -s BEFORE we get names so proper
 194                  * screening will be done.
 195                  */
 196                 if (!lflag)
 197                         sflag = 1;      /* if -l not explicit, force -s */
 198                 loginlist();
 199                 if (entries == 0)
 200                         printf("No one logged on.\n");
 201         } else {
 202                 userlist(argc, argv);
 203                 /*
 204                  * Assign explicit "large" format if names given and -s not
 205                  * explicitly stated.  Force the -l AFTER we get names so any
 206                  * remote finger attempts specified won't be mishandled.
 207                  */
 208                 if (!sflag)
 209                         lflag = 1;      /* if -s not explicit, force -l */
 210         }
 211         if (entries) {
 212                 if (lflag)
 213                         lflag_print();
 214                 else
 215                         sflag_print();
 216         }
 217         return (0);
 218 }
 219
 220 static void
 221 loginlist(void)
 222 {
 223         PERSON *pn;
 224         DBT data, key;
 225         struct passwd *pw;
 226         struct utmp user;
 227         int r, sflag1;
 228         char name[UT_NAMESIZE + 1];
 229
 230         if (!freopen(_PATH_UTMP, "r", stdin))
 231                 err(1, "%s", _PATH_UTMP);
 232         name[UT_NAMESIZE] = '\0';
 233         while (fread((char *)&user, sizeof(user), 1, stdin) == 1) {
 234                 if (!user.ut_name[0])
 235                         continue;
 236                 if ((pn = find_person(user.ut_name)) == NULL) {
 237                         bcopy(user.ut_name, name, UT_NAMESIZE);
 238                         if ((pw = getpwnam(name)) == NULL)
 239                                 continue;
 240                         if (hide(pw))
 241                                 continue;
 242                         pn = enter_person(pw);
 243                 }
 244                 enter_where(&user, pn);
 245         }
 246         if (db && lflag)
 247                 for (sflag1 = R_FIRST;; sflag1 = R_NEXT) {
 248                         PERSON *tmp;
 249
 250                         r = (*db->seq)(db, &key, &data, sflag1);
 251                         if (r == -1)
 252                                 err(1, "db seq");
 253                         if (r == 1)
 254                                 break;
 255                         memmove(&tmp, data.data, sizeof tmp);
 256                         enter_lastlog(tmp);
 257                 }
 258 }
 259
 260 static void
 261 userlist(int argc, char **argv)
 262 {
 263         PERSON *pn;
 264         DBT data, key;
 265         struct utmp user;
 266         struct passwd *pw;
 267         int r, sflag1, *used, *ip;
 268         char **ap, **nargv, **np, **p;
 269         FILE *conf_fp;
 270         char conf_alias[LINE_MAX];
 271         char *conf_realname;
 272         int conf_length;
 273
 274         if ((nargv = malloc((argc+1) * sizeof(char *))) == NULL ||
 275             (used = calloc(argc, sizeof(int))) == NULL)
 276                 err(1, NULL);
 277
 278         /* Pull out all network requests. */
 279         for (ap = p = argv, np = nargv; *p; ++p)
 280                 if (strchr(*p, '@'))
 281                         *np++ = *p;
 282                 else
 283                         *ap++ = *p;
 284
 285         *np++ = NULL;
 286         *ap++ = NULL;
 287
 288         if (!*argv)
 289                 goto net;
 290
 291         /*
 292          * Mark any arguments beginning with '/' as invalid so that we
 293          * don't accidently confuse them with expansions from finger.conf
 294          */
 295         for (p = argv, ip = used; *p; ++p, ++ip)
 296             if (**p == '/') {
 297                 *ip = 1;
 298                 warnx("%s: no such user", *p);
 299             }
 300
 301         /*
 302          * Traverse the finger alias configuration file of the form
 303          * alias:(user|alias), ignoring comment lines beginning '#'.
 304          */
 305         if ((conf_fp = fopen(_PATH_FINGERCONF, "r")) != NULL) {
 306             while(fgets(conf_alias, sizeof(conf_alias), conf_fp) != NULL) {
 307                 conf_length = strlen(conf_alias);
 308                 if (*conf_alias == '#' || conf_alias[--conf_length] != '\n')
 309                     continue;
 310                 conf_alias[conf_length] = '\0';      /* Remove trailing LF */
 311                 if ((conf_realname = strchr(conf_alias, ':')) == NULL)
 312                     continue;
 313                 *conf_realname = '\0';               /* Replace : with NUL */
 314                 for (p = argv; *p; ++p) {
 315                     if (strcmp(*p, conf_alias) == 0) {
 316                         if ((*p = strdup(conf_realname+1)) == NULL) {
 317                             err(1, NULL);
 318                         }
 319                     }
 320                 }
 321             }
 322             fclose(conf_fp);
 323         }
 324
 325         /*
 326          * Traverse the list of possible login names and check the login name
 327          * and real name against the name specified by the user. If the name
 328          * begins with a '/', try to read the file of that name instead of
 329          * gathering the traditional finger information.
 330          */
 331         if (mflag)
 332                 for (p = argv, ip = used; *p; ++p, ++ip) {
 333                         if (**p != '/' || *ip == 1 || !show_text("", *p, "")) {
 334                                 if (((pw = getpwnam(*p)) != NULL) && !hide(pw))
 335                                         enter_person(pw);
 336                                 else if (!*ip)
 337                                         warnx("%s: no such user", *p);
 338                         }
 339                 }
 340         else {
 341                 while ((pw = getpwent()) != NULL) {
 342                         for (p = argv, ip = used; *p; ++p, ++ip)
 343                                 if (**p == '/' && *ip != 1
 344                                     && show_text("", *p, ""))
 345                                         *ip = 1;
 346                                 else if (match(pw, *p) && !hide(pw)) {
 347                                         enter_person(pw);
 348                                         *ip = 1;
 349                                 }
 350                 }
 351                 for (p = argv, ip = used; *p; ++p, ++ip)
 352                         if (!*ip)
 353                                 warnx("%s: no such user", *p);
 354         }
 355
 356         /* Handle network requests. */
 357 net:    for (p = nargv; *p;) {
 358                 netfinger(*p++);
 359                 if (*p || entries)
 360                     printf("\n");
 361         }
 362
 363         if (entries == 0)
 364                 return;
 365
 366         /*
 367          * Scan thru the list of users currently logged in, saving
 368          * appropriate data whenever a match occurs.
 369          */
 370         if (!freopen(_PATH_UTMP, "r", stdin))
 371                 err(1, "%s", _PATH_UTMP);
 372         while (fread((char *)&user, sizeof(user), 1, stdin) == 1) {
 373                 if (!user.ut_name[0])
 374                         continue;
 375                 if ((pn = find_person(user.ut_name)) == NULL)
 376                         continue;
 377                 enter_where(&user, pn);
 378         }
 379         if (db)
 380                 for (sflag1 = R_FIRST;; sflag1 = R_NEXT) {
 381                         PERSON *tmp;
 382
 383                         r = (*db->seq)(db, &key, &data, sflag1);
 384                         if (r == -1)
 385                                 err(1, "db seq");
 386                         if (r == 1)
 387                                 break;
 388                         memmove(&tmp, data.data, sizeof tmp);
 389                         enter_lastlog(tmp);
 390                 }
 391 }