70ad88f354
Unfortunately it also uses lastlog, which means we must resort to local extensions of the utmpx-interface. Because the user name and TTY name are now nul-terminated, there is no need to copy around strings as often.
407 lines
10 KiB
C
407 lines
10 KiB
C
/*
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* Copyright (c) 1989, 1993
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* The Regents of the University of California. All rights reserved.
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*
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* This code is derived from software contributed to Berkeley by
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* Tony Nardo of the Johns Hopkins University/Applied Physics Lab.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. All advertising materials mentioning features or use of this software
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* must display the following acknowledgement:
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* This product includes software developed by the University of
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* California, Berkeley and its contributors.
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* 4. Neither the name of the University nor the names of its contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*/
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/*
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* Luke Mewburn <lm@rmit.edu.au> added the following on 940622:
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* - mail status ("No Mail", "Mail read:...", or "New Mail ...,
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* Unread since ...".)
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* - 4 digit phone extensions (3210 is printed as x3210.)
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* - host/office toggling in short format with -h & -o.
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* - short day names (`Tue' printed instead of `Jun 21' if the
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* login time is < 6 days.
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*/
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#ifndef lint
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static const char copyright[] =
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"@(#) Copyright (c) 1989, 1993\n\
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The Regents of the University of California. All rights reserved.\n";
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#endif /* not lint */
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#if 0
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#ifndef lint
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static char sccsid[] = "@(#)finger.c 8.5 (Berkeley) 5/4/95";
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#endif
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#endif
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#include <sys/cdefs.h>
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__FBSDID("$FreeBSD$");
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/*
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* Finger prints out information about users. It is not portable since
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* certain fields (e.g. the full user name, office, and phone numbers) are
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* extracted from the gecos field of the passwd file which other UNIXes
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* may not have or may use for other things.
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*
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* There are currently two output formats; the short format is one line
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* per user and displays login name, tty, login time, real name, idle time,
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* and either remote host information (default) or office location/phone
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* number, depending on if -h or -o is used respectively.
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* The long format gives the same information (in a more legible format) as
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* well as home directory, shell, mail info, and .plan/.project files.
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*/
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#include <sys/types.h>
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#include <sys/socket.h>
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#include <db.h>
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#include <err.h>
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#include <pwd.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <time.h>
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#define _ULOG_POSIX_NAMES
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#include <ulog.h>
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#include <unistd.h>
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#include <locale.h>
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#include "finger.h"
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#include "pathnames.h"
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DB *db;
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time_t now;
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int entries, gflag, kflag, lflag, mflag, pplan, sflag, oflag;
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sa_family_t family = PF_UNSPEC;
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int d_first = -1;
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char tbuf[1024];
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int invoker_root = 0;
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static void loginlist(void);
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static int option(int, char **);
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static void usage(void);
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static void userlist(int, char **);
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static int
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option(int argc, char **argv)
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{
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int ch;
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optind = 1; /* reset getopt */
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while ((ch = getopt(argc, argv, "46gklmpsho")) != -1)
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switch(ch) {
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case '4':
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family = AF_INET;
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break;
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case '6':
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family = AF_INET6;
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break;
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case 'g':
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gflag = 1;
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break;
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case 'k':
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kflag = 1; /* keep going without utmp */
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break;
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case 'l':
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lflag = 1; /* long format */
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break;
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case 'm':
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mflag = 1; /* force exact match of names */
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break;
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case 'p':
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pplan = 1; /* don't show .plan/.project */
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break;
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case 's':
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sflag = 1; /* short format */
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break;
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case 'h':
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oflag = 0; /* remote host info */
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break;
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case 'o':
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oflag = 1; /* office info */
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break;
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case '?':
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default:
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usage();
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}
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return optind;
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}
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static void
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usage(void)
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{
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(void)fprintf(stderr,
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"usage: finger [-46gklmpsho] [user ...] [user@host ...]\n");
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exit(1);
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}
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int
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main(int argc, char **argv)
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{
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int envargc, argcnt;
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char *envargv[3];
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struct passwd *pw;
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static char myname[] = "finger";
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if (getuid() == 0 || geteuid() == 0) {
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invoker_root = 1;
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if ((pw = getpwnam(UNPRIV_NAME)) && pw->pw_uid > 0) {
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setgid(pw->pw_gid);
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setuid(pw->pw_uid);
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} else {
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setgid(UNPRIV_UGID);
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setuid(UNPRIV_UGID);
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}
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}
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(void) setlocale(LC_ALL, "");
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/* remove this line to get remote host */
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oflag = 1; /* default to old "office" behavior */
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/*
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* Process environment variables followed by command line arguments.
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*/
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if ((envargv[1] = getenv("FINGER"))) {
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envargc = 2;
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envargv[0] = myname;
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envargv[2] = NULL;
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(void) option(envargc, envargv);
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}
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argcnt = option(argc, argv);
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argc -= argcnt;
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argv += argcnt;
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(void)time(&now);
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setpassent(1);
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if (!*argv) {
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/*
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* Assign explicit "small" format if no names given and -l
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* not selected. Force the -s BEFORE we get names so proper
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* screening will be done.
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*/
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if (!lflag)
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sflag = 1; /* if -l not explicit, force -s */
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loginlist();
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if (entries == 0)
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(void)printf("No one logged on.\n");
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} else {
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userlist(argc, argv);
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/*
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* Assign explicit "large" format if names given and -s not
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* explicitly stated. Force the -l AFTER we get names so any
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* remote finger attempts specified won't be mishandled.
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*/
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if (!sflag)
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lflag = 1; /* if -s not explicit, force -l */
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}
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if (entries) {
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if (lflag)
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lflag_print();
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else
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sflag_print();
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}
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return (0);
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}
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static void
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loginlist(void)
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{
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PERSON *pn;
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DBT data, key;
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struct passwd *pw;
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struct utmpx *user;
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int r, sflag1;
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if (kflag)
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errx(1, "can't list logins without reading utmp");
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setutxent();
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while ((user = getutxent()) != NULL) {
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if (user->ut_type != USER_PROCESS)
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continue;
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if ((pn = find_person(user->ut_user)) == NULL) {
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if ((pw = getpwnam(user->ut_user)) == NULL)
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continue;
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if (hide(pw))
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continue;
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pn = enter_person(pw);
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}
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enter_where(user, pn);
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}
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endutxent();
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if (db && lflag)
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for (sflag1 = R_FIRST;; sflag1 = R_NEXT) {
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PERSON *tmp;
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r = (*db->seq)(db, &key, &data, sflag1);
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if (r == -1)
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err(1, "db seq");
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if (r == 1)
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break;
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memmove(&tmp, data.data, sizeof tmp);
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enter_lastlog(tmp);
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}
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}
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static void
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userlist(int argc, char **argv)
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{
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PERSON *pn;
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DBT data, key;
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struct utmpx *user;
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struct passwd *pw;
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int r, sflag1, *used, *ip;
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char **ap, **nargv, **np, **p;
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FILE *conf_fp;
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char conf_alias[LINE_MAX];
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char *conf_realname;
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int conf_length;
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if ((nargv = malloc((argc+1) * sizeof(char *))) == NULL ||
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(used = calloc(argc, sizeof(int))) == NULL)
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err(1, NULL);
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/* Pull out all network requests. */
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for (ap = p = argv, np = nargv; *p; ++p)
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if (index(*p, '@'))
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*np++ = *p;
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else
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*ap++ = *p;
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*np++ = NULL;
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*ap++ = NULL;
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if (!*argv)
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goto net;
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/*
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* Mark any arguments beginning with '/' as invalid so that we
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* don't accidently confuse them with expansions from finger.conf
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*/
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for (p = argv, ip = used; *p; ++p, ++ip)
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if (**p == '/') {
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*ip = 1;
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warnx("%s: no such user", *p);
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}
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/*
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* Traverse the finger alias configuration file of the form
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* alias:(user|alias), ignoring comment lines beginning '#'.
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*/
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if ((conf_fp = fopen(_PATH_FINGERCONF, "r")) != NULL) {
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while(fgets(conf_alias, sizeof(conf_alias), conf_fp) != NULL) {
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conf_length = strlen(conf_alias);
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if (*conf_alias == '#' || conf_alias[--conf_length] != '\n')
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continue;
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conf_alias[conf_length] = '\0'; /* Remove trailing LF */
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if ((conf_realname = strchr(conf_alias, ':')) == NULL)
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continue;
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*conf_realname = '\0'; /* Replace : with NUL */
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for (p = argv; *p; ++p) {
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if (strcmp(*p, conf_alias) == 0) {
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if ((*p = strdup(conf_realname+1)) == NULL) {
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err(1, NULL);
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}
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}
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}
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}
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(void)fclose(conf_fp);
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}
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/*
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* Traverse the list of possible login names and check the login name
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* and real name against the name specified by the user. If the name
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* begins with a '/', try to read the file of that name instead of
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* gathering the traditional finger information.
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*/
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if (mflag)
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for (p = argv, ip = used; *p; ++p, ++ip) {
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if (**p != '/' || *ip == 1 || !show_text("", *p, "")) {
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if (((pw = getpwnam(*p)) != NULL) && !hide(pw))
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enter_person(pw);
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else if (!*ip)
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warnx("%s: no such user", *p);
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}
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}
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else {
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while ((pw = getpwent()) != NULL) {
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for (p = argv, ip = used; *p; ++p, ++ip)
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if (**p == '/' && *ip != 1
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&& show_text("", *p, ""))
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*ip = 1;
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else if (match(pw, *p) && !hide(pw)) {
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enter_person(pw);
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*ip = 1;
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}
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}
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for (p = argv, ip = used; *p; ++p, ++ip)
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if (!*ip)
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warnx("%s: no such user", *p);
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}
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/* Handle network requests. */
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net: for (p = nargv; *p;) {
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netfinger(*p++);
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if (*p || entries)
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printf("\n");
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}
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free(used);
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if (entries == 0)
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return;
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if (kflag)
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return;
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/*
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* Scan thru the list of users currently logged in, saving
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* appropriate data whenever a match occurs.
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*/
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setutxent();
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while ((user = getutxent()) != NULL) {
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if (user->ut_type != USER_PROCESS)
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continue;
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if ((pn = find_person(user->ut_user)) == NULL)
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continue;
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enter_where(user, pn);
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}
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endutxent();
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if (db)
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for (sflag1 = R_FIRST;; sflag1 = R_NEXT) {
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PERSON *tmp;
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r = (*db->seq)(db, &key, &data, sflag1);
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if (r == -1)
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err(1, "db seq");
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if (r == 1)
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break;
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memmove(&tmp, data.data, sizeof tmp);
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enter_lastlog(tmp);
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}
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}
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