FreeBSD-5.3/usr.bin/finger/finger.c
/*
* Copyright (c) 1989, 1993
* The Regents of the University of California. All rights reserved.
*
* This code is derived from software contributed to Berkeley by
* Tony Nardo of the Johns Hopkins University/Applied Physics Lab.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. All advertising materials mentioning features or use of this software
* must display the following acknowledgement:
* This product includes software developed by the University of
* California, Berkeley and its contributors.
* 4. Neither the name of the University nor the names of its contributors
* may be used to endorse or promote products derived from this software
* without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*/
/*
* Luke Mewburn <lm@rmit.edu.au> added the following on 940622:
* - mail status ("No Mail", "Mail read:...", or "New Mail ...,
* Unread since ...".)
* - 4 digit phone extensions (3210 is printed as x3210.)
* - host/office toggling in short format with -h & -o.
* - short day names (`Tue' printed instead of `Jun 21' if the
* login time is < 6 days.
*/
#ifndef lint
static const char copyright[] =
"@(#) Copyright (c) 1989, 1993\n\
The Regents of the University of California. All rights reserved.\n";
#endif /* not lint */
#if 0
#ifndef lint
static char sccsid[] = "@(#)finger.c 8.5 (Berkeley) 5/4/95";
#endif
#endif
#include <sys/cdefs.h>
__FBSDID("$FreeBSD: src/usr.bin/finger/finger.c,v 1.34 2004/03/14 05:50:34 bde Exp $");
/*
* Finger prints out information about users. It is not portable since
* certain fields (e.g. the full user name, office, and phone numbers) are
* extracted from the gecos field of the passwd file which other UNIXes
* may not have or may use for other things.
*
* There are currently two output formats; the short format is one line
* per user and displays login name, tty, login time, real name, idle time,
* and either remote host information (default) or office location/phone
* number, depending on if -h or -o is used respectively.
* The long format gives the same information (in a more legible format) as
* well as home directory, shell, mail info, and .plan/.project files.
*/
#include <sys/types.h>
#include <sys/socket.h>
#include <db.h>
#include <err.h>
#include <pwd.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <time.h>
#include <unistd.h>
#include <utmp.h>
#include <locale.h>
#include "finger.h"
#include "pathnames.h"
DB *db;
time_t now;
int entries, gflag, kflag, lflag, mflag, pplan, sflag, oflag, Tflag;
sa_family_t family = PF_UNSPEC;
int d_first = -1;
char tbuf[1024];
static void loginlist(void);
static int option(int, char **);
static void usage(void);
static void userlist(int, char **);
static int
option(int argc, char **argv)
{
int ch;
optind = 1; /* reset getopt */
while ((ch = getopt(argc, argv, "46gklmpshoT")) != -1)
switch(ch) {
case '4':
family = AF_INET;
break;
case '6':
family = AF_INET6;
break;
case 'g':
gflag = 1;
break;
case 'k':
kflag = 1; /* keep going without utmp */
break;
case 'l':
lflag = 1; /* long format */
break;
case 'm':
mflag = 1; /* force exact match of names */
break;
case 'p':
pplan = 1; /* don't show .plan/.project */
break;
case 's':
sflag = 1; /* short format */
break;
case 'h':
oflag = 0; /* remote host info */
break;
case 'o':
oflag = 1; /* office info */
break;
case 'T':
Tflag = 1; /* disable T/TCP */
break;
case '?':
default:
usage();
}
return optind;
}
static void
usage(void)
{
(void)fprintf(stderr, "usage: finger [-46klmpshoT] [login ...]\n");
exit(1);
}
int
main(int argc, char **argv)
{
int envargc, argcnt;
char *envargv[3];
struct passwd *pw;
static char myname[] = "finger";
if (getuid() == 0 || geteuid() == 0) {
if ((pw = getpwnam(UNPRIV_NAME)) && pw->pw_uid > 0) {
setgid(pw->pw_gid);
setuid(pw->pw_uid);
} else {
setgid(UNPRIV_UGID);
setuid(UNPRIV_UGID);
}
}
(void) setlocale(LC_ALL, "");
/* remove this line to get remote host */
oflag = 1; /* default to old "office" behavior */
/*
* Process environment variables followed by command line arguments.
*/
if ((envargv[1] = getenv("FINGER"))) {
envargc = 2;
envargv[0] = myname;
envargv[2] = NULL;
(void) option(envargc, envargv);
}
argcnt = option(argc, argv);
argc -= argcnt;
argv += argcnt;
(void)time(&now);
setpassent(1);
if (!*argv) {
/*
* Assign explicit "small" format if no names given and -l
* not selected. Force the -s BEFORE we get names so proper
* screening will be done.
*/
if (!lflag)
sflag = 1; /* if -l not explicit, force -s */
loginlist();
if (entries == 0)
(void)printf("No one logged on.\n");
} else {
userlist(argc, argv);
/*
* Assign explicit "large" format if names given and -s not
* explicitly stated. Force the -l AFTER we get names so any
* remote finger attempts specified won't be mishandled.
*/
if (!sflag)
lflag = 1; /* if -s not explicit, force -l */
}
if (entries) {
if (lflag)
lflag_print();
else
sflag_print();
}
return (0);
}
static void
loginlist(void)
{
PERSON *pn;
DBT data, key;
struct passwd *pw;
struct utmp user;
int r, sflag1;
char name[UT_NAMESIZE + 1];
if (kflag)
errx(1, "can't list logins without reading utmp");
if (!freopen(_PATH_UTMP, "r", stdin))
err(1, "%s", _PATH_UTMP);
name[UT_NAMESIZE] = '\0';
while (fread((char *)&user, sizeof(user), 1, stdin) == 1) {
if (!user.ut_name[0])
continue;
if ((pn = find_person(user.ut_name)) == NULL) {
bcopy(user.ut_name, name, UT_NAMESIZE);
if ((pw = getpwnam(name)) == NULL)
continue;
if (hide(pw))
continue;
pn = enter_person(pw);
}
enter_where(&user, pn);
}
if (db && lflag)
for (sflag1 = R_FIRST;; sflag1 = R_NEXT) {
PERSON *tmp;
r = (*db->seq)(db, &key, &data, sflag1);
if (r == -1)
err(1, "db seq");
if (r == 1)
break;
memmove(&tmp, data.data, sizeof tmp);
enter_lastlog(tmp);
}
}
static void
userlist(int argc, char **argv)
{
PERSON *pn;
DBT data, key;
struct utmp user;
struct passwd *pw;
int r, sflag1, *used, *ip;
char **ap, **nargv, **np, **p;
FILE *conf_fp;
char conf_alias[LINE_MAX];
char *conf_realname;
int conf_length;
if ((nargv = malloc((argc+1) * sizeof(char *))) == NULL ||
(used = calloc(argc, sizeof(int))) == NULL)
err(1, NULL);
/* Pull out all network requests. */
for (ap = p = argv, np = nargv; *p; ++p)
if (index(*p, '@'))
*np++ = *p;
else
*ap++ = *p;
*np++ = NULL;
*ap++ = NULL;
if (!*argv)
goto net;
/*
* Mark any arguments beginning with '/' as invalid so that we
* don't accidently confuse them with expansions from finger.conf
*/
for (p = argv, ip = used; *p; ++p, ++ip)
if (**p == '/') {
*ip = 1;
warnx("%s: no such user", *p);
}
/*
* Traverse the finger alias configuration file of the form
* alias:(user|alias), ignoring comment lines beginning '#'.
*/
if ((conf_fp = fopen(_PATH_FINGERCONF, "r")) != NULL) {
while(fgets(conf_alias, sizeof(conf_alias), conf_fp) != NULL) {
conf_length = strlen(conf_alias);
if (*conf_alias == '#' || conf_alias[--conf_length] != '\n')
continue;
conf_alias[conf_length] = '\0'; /* Remove trailing LF */
if ((conf_realname = strchr(conf_alias, ':')) == NULL)
continue;
*conf_realname = '\0'; /* Replace : with NUL */
for (p = argv; *p; ++p) {
if (strcmp(*p, conf_alias) == 0) {
if ((*p = strdup(conf_realname+1)) == NULL) {
err(1, NULL);
}
}
}
}
(void)fclose(conf_fp);
}
/*
* Traverse the list of possible login names and check the login name
* and real name against the name specified by the user. If the name
* begins with a '/', try to read the file of that name instead of
* gathering the traditional finger information.
*/
if (mflag)
for (p = argv, ip = used; *p; ++p, ++ip) {
if (**p != '/' || *ip == 1 || !show_text("", *p, "")) {
if (((pw = getpwnam(*p)) != NULL) && !hide(pw))
enter_person(pw);
else if (!*ip)
warnx("%s: no such user", *p);
}
}
else {
while ((pw = getpwent()) != NULL) {
for (p = argv, ip = used; *p; ++p, ++ip)
if (**p == '/' && *ip != 1
&& show_text("", *p, ""))
*ip = 1;
else if (match(pw, *p) && !hide(pw)) {
enter_person(pw);
*ip = 1;
}
}
for (p = argv, ip = used; *p; ++p, ++ip)
if (!*ip)
warnx("%s: no such user", *p);
}
/* Handle network requests. */
net: for (p = nargv; *p;) {
netfinger(*p++);
if (*p || entries)
printf("\n");
}
if (entries == 0)
return;
if (kflag)
return;
/*
* Scan thru the list of users currently logged in, saving
* appropriate data whenever a match occurs.
*/
if (!freopen(_PATH_UTMP, "r", stdin))
err(1, "%s", _PATH_UTMP);
while (fread((char *)&user, sizeof(user), 1, stdin) == 1) {
if (!user.ut_name[0])
continue;
if ((pn = find_person(user.ut_name)) == NULL)
continue;
enter_where(&user, pn);
}
if (db)
for (sflag1 = R_FIRST;; sflag1 = R_NEXT) {
PERSON *tmp;
r = (*db->seq)(db, &key, &data, sflag1);
if (r == -1)
err(1, "db seq");
if (r == 1)
break;
memmove(&tmp, data.data, sizeof tmp);
enter_lastlog(tmp);
}
}