2208eadf43
One of the things I really want to do, is to get rid of the limitations of our current utmp(5) mechanism: - It only allows 8 byte TTY device names. - The hostname only allows 16 bytes of storage. I'm not a big fan of <utmpx.h>, but I think we should at least try to add parts of it. Unfortunately we cannot implement <utmpx.h>, because we miss various fields, such as ut_id, ut_pid, etc. The API provided by libulog shares some similarities with <utmpx.h>, so it shouldn't be too hard to port these applications eventually. In most simple cases, it should just be a matter of removing the ulog_ prefix everywhere. As a bonus, it also implements a function called ulog_login_pseudo(), which allows unprivileged applications to write log entries, provided they have a valid file descriptor to a pseudo-terminal master device. libulog will allow a smoother transition to a new file format by adding a library interface to deal with utmp/wtmp/lastlog files. I initially thought about adding the functionality to libutil, but because I'm not planning on keeping this library around forever, we'd better keep it separated. Next items on the todo list: 1. Port applications in the base system (and ports) to libulog, instead of letting them use <utmp.h>. 2. Remove <utmp.h>, implement <utmpx.h> and reimplement this library on top. 3. Port as many applications as possible back to <utmpx.h>.
136 lines
3.8 KiB
C
136 lines
3.8 KiB
C
/*-
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* Copyright (c) 2009 Ed Schouten <ed@FreeBSD.org>
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* All rights reserved.
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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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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR 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 AUTHOR 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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#include <sys/cdefs.h>
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__FBSDID("$FreeBSD$");
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#include <fcntl.h>
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#include <inttypes.h>
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#include <paths.h>
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#include <pwd.h>
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#include <string.h>
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#include <unistd.h>
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#include <time.h>
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#include <timeconv.h>
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#include <ttyent.h>
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#include "ulog_internal.h"
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void
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ulog_login(const char *line, const char *user, const char *host)
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{
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struct futmp fu;
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struct flastlog fl;
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int fd;
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/* Remove /dev/ component. */
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if (strncmp(line, _PATH_DEV, sizeof _PATH_DEV - 1) == 0)
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line += sizeof _PATH_DEV - 1;
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/* Prepare log entries. */
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memset(&fu, 0, sizeof fu);
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strlcpy(fu.ut_line, line, sizeof fu.ut_line);
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strlcpy(fu.ut_user, user, sizeof fu.ut_user);
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if (host != NULL)
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strlcpy(fu.ut_host, host, sizeof fu.ut_host);
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fu.ut_time = _time_to_time32(time(NULL));
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fl.ll_time = fu.ut_time;
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memcpy(fl.ll_line, fu.ut_line, sizeof fl.ll_line);
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memcpy(fl.ll_host, fu.ut_host, sizeof fl.ll_host);
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/* Update utmp entry. */
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if ((fd = open(_PATH_UTMP, O_WRONLY|O_CREAT, 0644)) >= 0) {
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struct ttyent *ty;
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int idx;
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setttyent();
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for (idx = 1; (ty = getttyent()) != NULL; ++idx) {
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if (strcmp(ty->ty_name, line) != 0)
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continue;
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lseek(fd, (off_t)(idx * sizeof fu), L_SET);
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write(fd, &fu, sizeof fu);
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break;
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}
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endttyent();
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close(fd);
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}
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/* Add wtmp entry. */
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if ((fd = open(_PATH_WTMP, O_WRONLY|O_APPEND, 0)) >= 0) {
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write(fd, &fu, sizeof fu);
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close(fd);
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}
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/* Update lastlog entry. */
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if ((fd = open(_PATH_LASTLOG, O_WRONLY, 0)) >= 0) {
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struct passwd *pw;
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pw = getpwnam(user);
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if (pw != NULL) {
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lseek(fd, (off_t)(pw->pw_uid * sizeof fl), L_SET);
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write(fd, &fl, sizeof fl);
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}
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close(fd);
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}
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}
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void
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ulog_logout(const char *line)
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{
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struct futmp ut;
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int fd, found;
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/* Remove /dev/ component. */
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if (strncmp(line, _PATH_DEV, sizeof _PATH_DEV - 1) == 0)
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line += sizeof _PATH_DEV - 1;
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/* Mark entry in utmp as logged out. */
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if ((fd = open(_PATH_UTMP, O_RDWR, 0)) < 0)
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return;
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found = 0;
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while (read(fd, &ut, sizeof ut) == sizeof ut) {
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if (ut.ut_user[0] == '\0' ||
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strncmp(ut.ut_line, line, sizeof ut.ut_line) != 0)
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continue;
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memset(ut.ut_user, 0, sizeof ut.ut_user);
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memset(ut.ut_host, 0, sizeof ut.ut_host);
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ut.ut_time = _time_to_time32(time(NULL));
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lseek(fd, -(off_t)sizeof ut, L_INCR);
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write(fd, &ut, sizeof ut);
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found = 1;
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}
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close(fd);
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if (!found)
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return;
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/* utmp entry found. Also add logout entry to wtmp. */
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if ((fd = open(_PATH_WTMP, O_WRONLY|O_APPEND, 0)) >= 0) {
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write(fd, &ut, sizeof ut);
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close(fd);
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}
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}
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