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>.
94 lines
2.6 KiB
C
94 lines
2.6 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 <sys/wait.h>
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#include <errno.h>
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#include <signal.h>
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#include <stdlib.h>
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#include <sysexits.h>
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#include <unistd.h>
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#include "ulog_internal.h"
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#define _PATH_ULOG_HELPER "/usr/libexec/ulog-helper"
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/*
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* Registering login sessions.
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*/
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static void
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ulog_exec_helper(int fd, char const * const argv[])
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{
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sigset_t oblock, nblock;
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pid_t pid, wpid;
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int status;
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/* Block SIGCHLD. */
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sigemptyset(&nblock);
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sigaddset(&nblock, SIGCHLD);
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sigprocmask(SIG_BLOCK, &nblock, &oblock);
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switch (pid = fork()) {
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case -1:
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break;
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case 0:
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/* Execute helper program. */
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if (dup2(fd, STDIN_FILENO) == -1)
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exit(EX_UNAVAILABLE);
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sigprocmask(SIG_SETMASK, &oblock, NULL);
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execv(_PATH_ULOG_HELPER, __DECONST(char * const *, argv));
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exit(EX_UNAVAILABLE);
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default:
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/* Wait for helper to finish. */
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do {
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wpid = waitpid(pid, &status, 0);
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} while (wpid == -1 && errno == EINTR);
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break;
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}
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sigprocmask(SIG_SETMASK, &oblock, NULL);
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}
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void
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ulog_login_pseudo(int fd, const char *host)
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{
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char const * const args[4] = { "ulog-helper", "login", host, NULL };
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ulog_exec_helper(fd, args);
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}
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void
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ulog_logout_pseudo(int fd)
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{
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char const * const args[3] = { "ulog-helper", "logout", NULL };
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ulog_exec_helper(fd, args);
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}
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