FreeBSD-5.3/usr.bin/finger/util.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.
*/
#if 0
#ifndef lint
static char sccsid[] = "@(#)util.c 8.3 (Berkeley) 4/28/95";
#endif
#endif
#include <sys/cdefs.h>
__FBSDID("$FreeBSD: src/usr.bin/finger/util.c,v 1.21 2003/04/02 20:22:29 rwatson Exp $");
#include <sys/param.h>
#include <sys/socket.h>
#include <sys/stat.h>
#include <ctype.h>
#include <db.h>
#include <err.h>
#include <errno.h>
#include <fcntl.h>
#include <paths.h>
#include <pwd.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include <utmp.h>
#include "finger.h"
#include "pathnames.h"
static void find_idle_and_ttywrite(WHERE *);
static void userinfo(PERSON *, struct passwd *);
static WHERE *walloc(PERSON *);
int
match(struct passwd *pw, const char *user)
{
char *p, *t;
char name[1024];
if (!strcasecmp(pw->pw_name, user))
return(1);
/*
* XXX
* Why do we skip asterisks!?!?
*/
(void)strncpy(p = tbuf, pw->pw_gecos, sizeof(tbuf));
tbuf[sizeof(tbuf) - 1] = '\0';
if (*p == '*')
++p;
/* Ampersands get replaced by the login name. */
if ((p = strtok(p, ",")) == NULL)
return(0);
for (t = name; t < &name[sizeof(name) - 1] && (*t = *p) != '\0'; ++p) {
if (*t == '&') {
(void)strncpy(t, pw->pw_name,
sizeof(name) - (t - name));
name[sizeof(name) - 1] = '\0';
while (t < &name[sizeof(name) - 1] && *++t)
continue;
} else {
++t;
}
}
*t = '\0';
for (t = name; (p = strtok(t, "\t ")) != NULL; t = NULL)
if (!strcasecmp(p, user))
return(1);
return(0);
}
void
enter_lastlog(PERSON *pn)
{
WHERE *w;
static int opened, fd;
struct lastlog ll;
char doit = 0;
/* some systems may not maintain lastlog, don't report errors. */
if (!opened) {
fd = open(_PATH_LASTLOG, O_RDONLY, 0);
opened = 1;
}
if (fd == -1 ||
lseek(fd, (long)pn->uid * sizeof(ll), SEEK_SET) !=
(long)pn->uid * sizeof(ll) ||
read(fd, (char *)&ll, sizeof(ll)) != sizeof(ll)) {
/* as if never logged in */
ll.ll_line[0] = ll.ll_host[0] = '\0';
ll.ll_time = 0;
}
if ((w = pn->whead) == NULL)
doit = 1;
else if (ll.ll_time != 0) {
/* if last login is earlier than some current login */
for (; !doit && w != NULL; w = w->next)
if (w->info == LOGGEDIN && w->loginat < ll.ll_time)
doit = 1;
/*
* and if it's not any of the current logins
* can't use time comparison because there may be a small
* discrepancy since login calls time() twice
*/
for (w = pn->whead; doit && w != NULL; w = w->next)
if (w->info == LOGGEDIN &&
strncmp(w->tty, ll.ll_line, UT_LINESIZE) == 0)
doit = 0;
}
if (doit) {
w = walloc(pn);
w->info = LASTLOG;
bcopy(ll.ll_line, w->tty, UT_LINESIZE);
w->tty[UT_LINESIZE] = 0;
bcopy(ll.ll_host, w->host, UT_HOSTSIZE);
w->host[UT_HOSTSIZE] = 0;
w->loginat = ll.ll_time;
}
}
void
enter_where(struct utmp *ut, PERSON *pn)
{
WHERE *w;
w = walloc(pn);
w->info = LOGGEDIN;
bcopy(ut->ut_line, w->tty, UT_LINESIZE);
w->tty[UT_LINESIZE] = 0;
bcopy(ut->ut_host, w->host, UT_HOSTSIZE);
w->host[UT_HOSTSIZE] = 0;
w->loginat = (time_t)ut->ut_time;
find_idle_and_ttywrite(w);
}
PERSON *
enter_person(struct passwd *pw)
{
DBT data, key;
PERSON *pn;
if (db == NULL &&
(db = dbopen(NULL, O_RDWR, 0, DB_BTREE, NULL)) == NULL)
err(1, NULL);
key.data = pw->pw_name;
key.size = strlen(pw->pw_name);
switch ((*db->get)(db, &key, &data, 0)) {
case 0:
memmove(&pn, data.data, sizeof pn);
return (pn);
default:
case -1:
err(1, "db get");
/* NOTREACHED */
case 1:
++entries;
pn = palloc();
userinfo(pn, pw);
pn->whead = NULL;
data.size = sizeof(PERSON *);
data.data = &pn;
if ((*db->put)(db, &key, &data, 0))
err(1, "db put");
return (pn);
}
}
PERSON *
find_person(const char *name)
{
struct passwd *pw;
int cnt;
DBT data, key;
PERSON *p;
char buf[UT_NAMESIZE + 1];
if (!db)
return(NULL);
if ((pw = getpwnam(name)) && hide(pw))
return(NULL);
/* Name may be only UT_NAMESIZE long and not NUL terminated. */
for (cnt = 0; cnt < UT_NAMESIZE && *name; ++name, ++cnt)
buf[cnt] = *name;
buf[cnt] = '\0';
key.data = buf;
key.size = cnt;
if ((*db->get)(db, &key, &data, 0))
return (NULL);
memmove(&p, data.data, sizeof p);
return (p);
}
PERSON *
palloc(void)
{
PERSON *p;
if ((p = malloc(sizeof(PERSON))) == NULL)
err(1, NULL);
return(p);
}
static WHERE *
walloc(PERSON *pn)
{
WHERE *w;
if ((w = malloc(sizeof(WHERE))) == NULL)
err(1, NULL);
if (pn->whead == NULL)
pn->whead = pn->wtail = w;
else {
pn->wtail->next = w;
pn->wtail = w;
}
w->next = NULL;
return(w);
}
char *
prphone(char *num)
{
char *p;
int len;
static char pbuf[20];
/* don't touch anything if the user has their own formatting */
for (p = num; *p; ++p)
if (!isdigit(*p))
return(num);
len = p - num;
p = pbuf;
switch(len) {
case 11: /* +0-123-456-7890 */
*p++ = '+';
*p++ = *num++;
*p++ = '-';
/* FALLTHROUGH */
case 10: /* 012-345-6789 */
*p++ = *num++;
*p++ = *num++;
*p++ = *num++;
*p++ = '-';
/* FALLTHROUGH */
case 7: /* 012-3456 */
*p++ = *num++;
*p++ = *num++;
*p++ = *num++;
break;
case 5: /* x0-1234 */
case 4: /* x1234 */
*p++ = 'x';
*p++ = *num++;
break;
default:
return(num);
}
if (len != 4) {
*p++ = '-';
*p++ = *num++;
}
*p++ = *num++;
*p++ = *num++;
*p++ = *num++;
*p = '\0';
return(pbuf);
}
static void
find_idle_and_ttywrite(WHERE *w)
{
struct stat sb;
time_t touched;
int error;
(void)snprintf(tbuf, sizeof(tbuf), "%s/%s", _PATH_DEV, w->tty);
error = stat(tbuf, &sb);
if (error < 0 && errno == ENOENT) {
/*
* The terminal listed is not actually a terminal (i.e.,
* ":0"). This is a failure, so we'll skip printing
* out the idle time, which is non-ideal but better
* than a bogus warning and idle time.
*/
w->idletime = -1;
return;
} else if (error < 0) {
warn("%s", tbuf);
w->idletime = -1;
return;
}
touched = sb.st_atime;
if (touched < w->loginat) {
/* tty untouched since before login */
touched = w->loginat;
}
w->idletime = now < touched ? 0 : now - touched;
#define TALKABLE 0220 /* tty is writable if 220 mode */
w->writable = ((sb.st_mode & TALKABLE) == TALKABLE);
}
static void
userinfo(PERSON *pn, struct passwd *pw)
{
char *p, *t;
char *bp, name[1024];
struct stat sb;
pn->realname = pn->office = pn->officephone = pn->homephone = NULL;
pn->uid = pw->pw_uid;
if ((pn->name = strdup(pw->pw_name)) == NULL)
err(1, "strdup failed");
if ((pn->dir = strdup(pw->pw_dir)) == NULL)
err(1, "strdup failed");
if ((pn->shell = strdup(pw->pw_shell)) == NULL)
err(1, "strdup failed");
/* why do we skip asterisks!?!? */
(void)strncpy(bp = tbuf, pw->pw_gecos, sizeof(tbuf));
tbuf[sizeof(tbuf) - 1] = '\0';
if (*bp == '*')
++bp;
/* ampersands get replaced by the login name */
if (!(p = strsep(&bp, ",")))
return;
for (t = name; t < &name[sizeof(name) - 1] && (*t = *p) != '\0'; ++p) {
if (*t == '&') {
(void)strncpy(t, pw->pw_name,
sizeof(name) - (t - name));
name[sizeof(name) - 1] = '\0';
if (islower(*t))
*t = toupper(*t);
while (t < &name[sizeof(name) - 1] && *++t)
continue;
} else {
++t;
}
}
*t = '\0';
if ((pn->realname = strdup(name)) == NULL)
err(1, "strdup failed");
pn->office = ((p = strsep(&bp, ",")) && *p) ?
strdup(p) : NULL;
pn->officephone = ((p = strsep(&bp, ",")) && *p) ?
strdup(p) : NULL;
pn->homephone = ((p = strsep(&bp, ",")) && *p) ?
strdup(p) : NULL;
(void)snprintf(tbuf, sizeof(tbuf), "%s/%s", _PATH_MAILDIR, pw->pw_name);
pn->mailrecv = -1; /* -1 == not_valid */
if (stat(tbuf, &sb) < 0) {
if (errno != ENOENT) {
warn("%s", tbuf);
return;
}
} else if (sb.st_size != 0) {
pn->mailrecv = sb.st_mtime;
pn->mailread = sb.st_atime;
}
}
/*
* Is this user hiding from finger?
* If ~<user>/.nofinger exists, return 1 (hide), else return 0 (nohide).
*/
int
hide(struct passwd *pw)
{
struct stat st;
char buf[MAXPATHLEN];
if (!pw->pw_dir)
return 0;
snprintf(buf, sizeof(buf), "%s/%s", pw->pw_dir, _PATH_NOFINGER);
if (stat(buf, &st) == 0)
return 1;
return 0;
}