freebsd-dev/usr.bin/finger/util.c

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/*-
* SPDX-License-Identifier: BSD-3-Clause
*
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* 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. 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
* 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
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#ifndef lint
static char sccsid[] = "@(#)util.c 8.3 (Berkeley) 4/28/95";
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#endif
#endif
#include <sys/cdefs.h>
__FBSDID("$FreeBSD$");
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#include <sys/param.h>
#include <sys/socket.h>
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#include <sys/stat.h>
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#include <ctype.h>
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#include <db.h>
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#include <err.h>
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#include <errno.h>
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#include <fcntl.h>
#include <paths.h>
#include <pwd.h>
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#include <stdio.h>
#include <stdlib.h>
#include <string.h>
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#include <unistd.h>
#include <utmpx.h>
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#include "finger.h"
#include "pathnames.h"
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static void find_idle_and_ttywrite(WHERE *);
static void userinfo(PERSON *, struct passwd *);
static WHERE *walloc(PERSON *);
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int
match(struct passwd *pw, const char *user)
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{
char *p, *t;
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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';
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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 {
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++t;
}
}
*t = '\0';
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for (t = name; (p = strtok(t, "\t ")) != NULL; t = NULL)
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if (!strcasecmp(p, user))
return(1);
return(0);
}
void
enter_lastlog(PERSON *pn)
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{
WHERE *w;
struct utmpx *ut = NULL;
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char doit = 0;
if (setutxdb(UTXDB_LASTLOGIN, NULL) == 0)
ut = getutxuser(pn->name);
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if ((w = pn->whead) == NULL)
doit = 1;
else if (ut != NULL && ut->ut_type == USER_PROCESS) {
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/* if last login is earlier than some current login */
for (; !doit && w != NULL; w = w->next)
if (w->info == LOGGEDIN &&
w->loginat < ut->ut_tv.tv_sec)
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doit = 1;
/*
* and if it's not any of the current logins
* can't use time comparison because there may be a small
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* discrepancy since login calls time() twice
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*/
for (w = pn->whead; doit && w != NULL; w = w->next)
if (w->info == LOGGEDIN &&
strcmp(w->tty, ut->ut_line) == 0)
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doit = 0;
}
if (ut != NULL && doit) {
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w = walloc(pn);
w->info = LASTLOG;
strcpy(w->tty, ut->ut_line);
strcpy(w->host, ut->ut_host);
w->loginat = ut->ut_tv.tv_sec;
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}
endutxent();
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}
void
enter_where(struct utmpx *ut, PERSON *pn)
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{
WHERE *w;
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w = walloc(pn);
w->info = LOGGEDIN;
strcpy(w->tty, ut->ut_line);
strcpy(w->host, ut->ut_host);
w->loginat = ut->ut_tv.tv_sec;
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find_idle_and_ttywrite(w);
}
PERSON *
enter_person(struct passwd *pw)
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{
DBT data, key;
PERSON *pn;
if (db == NULL &&
(db = dbopen(NULL, O_RDWR, 0, DB_BTREE, NULL)) == NULL)
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err(1, NULL);
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key.data = pw->pw_name;
key.size = strlen(pw->pw_name);
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switch ((*db->get)(db, &key, &data, 0)) {
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case 0:
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memmove(&pn, data.data, sizeof pn);
return (pn);
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default:
case -1:
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err(1, "db get");
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/* 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))
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err(1, "db put");
return (pn);
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}
}
PERSON *
find_person(char *name)
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{
struct passwd *pw;
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DBT data, key;
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PERSON *p;
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if (!db)
return(NULL);
if ((pw = getpwnam(name)) && hide(pw))
return(NULL);
key.data = name;
key.size = strlen(name);
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if ((*db->get)(db, &key, &data, 0))
return (NULL);
memmove(&p, data.data, sizeof p);
return (p);
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}
PERSON *
palloc(void)
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{
PERSON *p;
if ((p = malloc(sizeof(PERSON))) == NULL)
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err(1, NULL);
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return(p);
}
static WHERE *
walloc(PERSON *pn)
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{
WHERE *w;
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if ((w = malloc(sizeof(WHERE))) == NULL)
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err(1, NULL);
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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)
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{
char *p;
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int len;
static char pbuf[20];
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/* 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 */
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*p++ = 'x';
*p++ = *num++;
break;
default:
return(num);
}
if (len != 4) {
*p++ = '-';
*p++ = *num++;
}
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*p++ = *num++;
*p++ = *num++;
*p++ = *num++;
*p = '\0';
return(pbuf);
}
static void
find_idle_and_ttywrite(WHERE *w)
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{
struct stat sb;
time_t touched;
int error;
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(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;
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return;
}
touched = sb.st_atime;
if (touched < w->loginat) {
/* tty untouched since before login */
touched = w->loginat;
}
w->idletime = now < touched ? 0 : now - touched;
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#define TALKABLE 0220 /* tty is writable if 220 mode */
w->writable = ((sb.st_mode & TALKABLE) == TALKABLE);
}
static void
userinfo(PERSON *pn, struct passwd *pw)
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{
char *p, *t;
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char *bp, name[1024];
struct stat sb;
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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");
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/* why do we skip asterisks!?!? */
(void)strncpy(bp = tbuf, pw->pw_gecos, sizeof(tbuf));
tbuf[sizeof(tbuf) - 1] = '\0';
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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) {
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if (*t == '&') {
(void)strncpy(t, pw->pw_name,
sizeof(name) - (t - name));
name[sizeof(name) - 1] = '\0';
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if (islower(*t))
*t = toupper(*t);
while (t < &name[sizeof(name) - 1] && *++t)
continue;
} else {
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++t;
}
}
*t = '\0';
if ((pn->realname = strdup(name)) == NULL)
err(1, "strdup failed");
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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;
}
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}
/*
* Is this user hiding from finger?
* If ~<user>/.nofinger exists, return 1 (hide), else return 0 (nohide).
* Nobody can hide from root.
*/
int
hide(struct passwd *pw)
{
struct stat st;
char buf[MAXPATHLEN];
if (invoker_root || !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;
}