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. 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  * @(#) Copyright (c) 1989, 1993 The Regents of the University of California.  All rights reserved.
  33  * @(#)finger.c 8.5 (Berkeley) 5/4/95
  34  * $FreeBSD: src/usr.bin/finger/finger.c,v 1.15.2.9 2002/07/29 18:52:52 ume Exp $
  35  * $DragonFly: src/usr.bin/finger/finger.c,v 1.6 2008/06/05 18:06:33 swildner Exp $
  36  */
  37
  38 /*
  39  * Luke Mewburn <lm@rmit.edu.au> added the following on 940622:
  40  *    - mail status ("No Mail", "Mail read:...", or "New Mail ...,
  41  *      Unread since ...".)
  42  *    - 4 digit phone extensions (3210 is printed as x3210.)
  43  *    - host/office toggling in short format with -h & -o.
  44  *    - short day names (`Tue' printed instead of `Jun 21' if the
  45  *      login time is < 6 days.
  46  */
  47
  48 /*
  49  * Finger prints out information about users.  It is not portable since
  50  * certain fields (e.g. the full user name, office, and phone numbers) are
  51  * extracted from the gecos field of the passwd file which other UNIXes
  52  * may not have or may use for other things.
  53  *
  54  * There are currently two output formats; the short format is one line
  55  * per user and displays login name, tty, login time, real name, idle time,
  56  * and either remote host information (default) or office location/phone
  57  * number, depending on if -h or -o is used respectively.
  58  * The long format gives the same information (in a more legible format) as
  59  * well as home directory, shell, mail info, and .plan/.project files.
  60  */
  61
  62 #include <sys/types.h>
  63 #include <sys/socket.h>
  64 #include <db.h>
  65 #include <err.h>
  66 #include <pwd.h>
  67 #include <stdio.h>
  68 #include <stdlib.h>
  69 #include <string.h>
  70 #include <time.h>
  71 #include <unistd.h>
  72 #include "utmpentry.h"
  73 #include <locale.h>
  74
  75 #include "finger.h"
  76 #include "pathnames.h"
  77
  78 DB *db;
  79 time_t now;
  80 int entries, gflag, lflag, mflag, pplan, sflag, oflag, eightflag;
  81 sa_family_t family = PF_UNSPEC;
  82 int d_first = -1;
  83 char tbuf[1024];
  84
  85 static void loginlist(void);
  86 static int option(int, char **);
  87 static void usage(void);
  88 static void userlist(int, char **);
  89
  90 static int
  91 option(int argc, char **argv)
  92 {
  93         int ch;
  94
  95         optind = 1;             /* reset getopt */
  96
  97         while ((ch = getopt(argc, argv, "468glmpsho")) != -1)
  98                 switch(ch) {
  99                 case '4':
 100                         family = AF_INET;
 101                         break;
 102                 case '6':
 103                         family = AF_INET6;
 104                         break;
 105                 case '8':
 106                         eightflag = 1;          /* allow 8-bit passthrough */
 107                         break;
 108                 case 'g':
 109                         gflag = 1;
 110                         break;
 111                 case 'l':
 112                         lflag = 1;              /* long format */
 113                         break;
 114                 case 'm':
 115                         mflag = 1;              /* force exact match of names */
 116                         break;
 117                 case 'p':
 118                         pplan = 1;              /* don't show .plan/.project */
 119                         break;
 120                 case 's':
 121                         sflag = 1;              /* short format */
 122                         break;
 123                 case 'h':
 124                         oflag = 0;              /* remote host info */
 125                         break;
 126                 case 'o':
 127                         oflag = 1;              /* office info */
 128                         break;
 129                 case '?':
 130                 default:
 131                         usage();
 132                 }
 133
 134         return optind;
 135 }
 136
 137 static void
 138 usage(void)
 139 {
 140         fprintf(stderr, "usage: finger [-468lmpshoT] [login ...]\n");
 141         exit(1);
 142 }
 143
 144 int
 145 main(int argc, char **argv)
 146 {
 147         int envargc, argcnt;
 148         char *envargv[3];
 149         struct passwd *pw;
 150         static char myname[] = "finger";
 151
 152         if (getuid() == 0 || geteuid() == 0) {
 153                 if ((pw = getpwnam(UNPRIV_NAME)) && pw->pw_uid > 0) {
 154                          setgid(pw->pw_gid);
 155                          setuid(pw->pw_uid);
 156                 } else {
 157                          setgid(UNPRIV_UGID);
 158                          setuid(UNPRIV_UGID);
 159                 }
 160         }
 161
 162         (void) setlocale(LC_ALL, "");
 163
 164                                 /* remove this line to get remote host */
 165         oflag = 1;              /* default to old "office" behavior */
 166
 167         /*
 168          * Process environment variables followed by command line arguments.
 169          */
 170         if ((envargv[1] = getenv("FINGER"))) {
 171                 envargc = 2;
 172                 envargv[0] = myname;
 173                 envargv[2] = NULL;
 174                 option(envargc, envargv);
 175         }
 176
 177         argcnt = option(argc, argv);
 178         argc -= argcnt;
 179         argv += argcnt;
 180
 181         time(&now);
 182         setpassent(1);
 183         if (!*argv) {
 184                 /*
 185                  * Assign explicit "small" format if no names given and -l
 186                  * not selected.  Force the -s BEFORE we get names so proper
 187                  * screening will be done.
 188                  */
 189                 if (!lflag)
 190                         sflag = 1;      /* if -l not explicit, force -s */
 191                 loginlist();
 192                 if (entries == 0)
 193                         printf("No one logged on.\n");
 194         } else {
 195                 userlist(argc, argv);
 196                 /*
 197                  * Assign explicit "large" format if names given and -s not
 198                  * explicitly stated.  Force the -l AFTER we get names so any
 199                  * remote finger attempts specified won't be mishandled.
 200                  */
 201                 if (!sflag)
 202                         lflag = 1;      /* if -s not explicit, force -l */
 203         }
 204         if (entries) {
 205                 if (lflag)
 206                         lflag_print();
 207                 else
 208                         sflag_print();
 209         }
 210         return (0);
 211 }
 212
 213 static void
 214 loginlist(void)
 215 {
 216         PERSON *pn;
 217         DBT data, key;
 218         struct passwd *pw;
 219         struct utmpentry *ep;
 220         int r, sflag1;
 221
 222         getutentries(NULL, &ep);
 223         for (; ep; ep = ep->next) {
 224                 if ((pn = find_person(ep->name)) == NULL) {
 225                         if ((pw = getpwnam(ep->name)) == NULL)
 226                                 continue;
 227                         if (hide(pw))
 228                                 continue;
 229                         pn = enter_person(pw);
 230                 }
 231                 enter_where(ep, pn);
 232         }
 233         if (db && lflag)
 234                 for (sflag1 = R_FIRST;; sflag1 = R_NEXT) {
 235                         PERSON *tmp;
 236
 237                         r = (*db->seq)(db, &key, &data, sflag1);
 238                         if (r == -1)
 239                                 err(1, "db seq");
 240                         if (r == 1)
 241                                 break;
 242                         memmove(&tmp, data.data, sizeof tmp);
 243                         enter_lastlog(tmp);
 244                 }
 245 }
 246
 247 static void
 248 userlist(int argc, char **argv)
 249 {
 250         PERSON *pn;
 251         DBT data, key;
 252         struct utmpentry *ep;
 253         struct passwd *pw;
 254         int r, sflag1, *used, *ip;
 255         char **ap, **nargv, **np, **p;
 256         FILE *conf_fp;
 257         char conf_alias[LINE_MAX];
 258         char *conf_realname;
 259         int conf_length;
 260
 261         if ((nargv = malloc((argc+1) * sizeof(char *))) == NULL ||
 262             (used = calloc(argc, sizeof(int))) == NULL)
 263                 err(1, NULL);
 264
 265         /* Pull out all network requests. */
 266         for (ap = p = argv, np = nargv; *p; ++p)
 267                 if (strchr(*p, '@'))
 268                         *np++ = *p;
 269                 else
 270                         *ap++ = *p;
 271
 272         *np++ = NULL;
 273         *ap++ = NULL;
 274
 275         if (!*argv)
 276                 goto net;
 277
 278         /*
 279          * Mark any arguments beginning with '/' as invalid so that we
 280          * don't accidently confuse them with expansions from finger.conf
 281          */
 282         for (p = argv, ip = used; *p; ++p, ++ip)
 283             if (**p == '/') {
 284                 *ip = 1;
 285                 warnx("%s: no such user", *p);
 286             }
 287
 288         /*
 289          * Traverse the finger alias configuration file of the form
 290          * alias:(user|alias), ignoring comment lines beginning '#'.
 291          */
 292         if ((conf_fp = fopen(_PATH_FINGERCONF, "r")) != NULL) {
 293             while(fgets(conf_alias, sizeof(conf_alias), conf_fp) != NULL) {
 294                 conf_length = strlen(conf_alias);
 295                 if (*conf_alias == '#' || conf_alias[--conf_length] != '\n')
 296                     continue;
 297                 conf_alias[conf_length] = '\0';      /* Remove trailing LF */
 298                 if ((conf_realname = strchr(conf_alias, ':')) == NULL)
 299                     continue;
 300                 *conf_realname = '\0';               /* Replace : with NUL */
 301                 for (p = argv; *p; ++p) {
 302                     if (strcmp(*p, conf_alias) == 0) {
 303                         if ((*p = strdup(conf_realname+1)) == NULL) {
 304                             err(1, NULL);
 305                         }
 306                     }
 307                 }
 308             }
 309             fclose(conf_fp);
 310         }
 311
 312         /*
 313          * Traverse the list of possible login names and check the login name
 314          * and real name against the name specified by the user. If the name
 315          * begins with a '/', try to read the file of that name instead of
 316          * gathering the traditional finger information.
 317          */
 318         if (mflag)
 319                 for (p = argv, ip = used; *p; ++p, ++ip) {
 320                         if (**p != '/' || *ip == 1 || !show_text("", *p, "")) {
 321                                 if (((pw = getpwnam(*p)) != NULL) && !hide(pw))
 322                                         enter_person(pw);
 323                                 else if (!*ip)
 324                                         warnx("%s: no such user", *p);
 325                         }
 326                 }
 327         else {
 328                 while ((pw = getpwent()) != NULL) {
 329                         for (p = argv, ip = used; *p; ++p, ++ip)
 330                                 if (**p == '/' && *ip != 1
 331                                     && show_text("", *p, ""))
 332                                         *ip = 1;
 333                                 else if (match(pw, *p) && !hide(pw)) {
 334                                         enter_person(pw);
 335                                         *ip = 1;
 336                                 }
 337                 }
 338                 for (p = argv, ip = used; *p; ++p, ++ip)
 339                         if (!*ip)
 340                                 warnx("%s: no such user", *p);
 341         }
 342
 343         /* Handle network requests. */
 344 net:    for (p = nargv; *p;) {
 345                 netfinger(*p++);
 346                 if (*p || entries)
 347                     printf("\n");
 348         }
 349
 350         if (entries == 0)
 351                 return;
 352
 353         /*
 354          * Scan thru the list of users currently logged in, saving
 355          * appropriate data whenever a match occurs.
 356          */
 357         getutentries(NULL, &ep);
 358         for (; ep; ep = ep->next) {
 359                 if ((pn = find_person(ep->name)) == NULL)
 360                         continue;
 361                 enter_where(ep, pn);
 362         }
 363         if (db)
 364                 for (sflag1 = R_FIRST;; sflag1 = R_NEXT) {
 365                         PERSON *tmp;
 366
 367                         r = (*db->seq)(db, &key, &data, sflag1);
 368                         if (r == -1)
 369                                 err(1, "db seq");
 370                         if (r == 1)
 371                                 break;
 372                         memmove(&tmp, data.data, sizeof tmp);
 373                         enter_lastlog(tmp);
 374                 }
 375 }