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![Ed Schouten](/assets/img/avatar_default.png)
- Just like struct utmp, store strings inside struct utmpx itself. This is needed to make things like pututxline() work. - Add ut_id and ut_pid fields, even though they have little use in our implementation. - It turns out our "reboot" wtmp entries indicate a system boot, so remove REBOOT_TIME - Implement getutxline() and pututxline - Add getutxuser() and setutxfile(), which allows us to crawl wtmp and lastlog files as well. - Add _ULOG_POSIX_NAMES, so we can already use the POSIX names if we really want to.
209 lines
5.1 KiB
C
209 lines
5.1 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/param.h>
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#include <fcntl.h>
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#include <pwd.h>
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#include <string.h>
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#include <timeconv.h>
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#include <unistd.h>
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#include "ulog_internal.h"
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static void
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ulog_utmpx_to_futmp(const struct ulog_utmpx *utx, struct futmp *ut)
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{
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memset(ut, 0, sizeof *ut);
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#define COPY_STRING(field) do { \
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strncpy(ut->ut_ ## field, utx->ut_ ## field, \
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MIN(sizeof ut->ut_ ## field, sizeof utx->ut_ ## field)); \
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} while (0)
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switch (utx->ut_type) {
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case BOOT_TIME:
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strcpy(ut->ut_user, "reboot");
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ut->ut_line[0] = '~';
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break;
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case OLD_TIME:
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strcpy(ut->ut_user, "date");
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ut->ut_line[0] = '|';
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break;
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case NEW_TIME:
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strcpy(ut->ut_user, "date");
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ut->ut_line[0] = '{';
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break;
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case USER_PROCESS:
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COPY_STRING(user);
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COPY_STRING(line);
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COPY_STRING(host);
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break;
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case DEAD_PROCESS:
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COPY_STRING(line);
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break;
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case SHUTDOWN_TIME:
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strcpy(ut->ut_user, "shutdown");
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ut->ut_line[0] = '~';
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break;
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}
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#undef COPY_STRING
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ut->ut_time = _time_to_time32(utx->ut_tv.tv_sec);
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}
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static void
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ulog_utmpx_to_flastlog(const struct ulog_utmpx *utx, struct flastlog *ll)
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{
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memset(ll, 0, sizeof *ll);
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#define COPY_STRING(field) do { \
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strncpy(ll->ll_ ## field, utx->ut_ ## field, \
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MIN(sizeof ll->ll_ ## field, sizeof utx->ut_ ## field)); \
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} while (0)
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switch (utx->ut_type) {
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case USER_PROCESS:
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COPY_STRING(line);
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COPY_STRING(host);
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break;
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}
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#undef COPY_STRING
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ll->ll_time = _time_to_time32(utx->ut_tv.tv_sec);
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}
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static void
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ulog_write_utmp_fast(const struct futmp *ut)
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{
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unsigned int idx;
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char line[sizeof ut->ut_line + 1];
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int fd;
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if ((fd = open(_PATH_UTMP, O_WRONLY|O_CREAT, 0644)) < 0)
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return;
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strlcpy(line, ut->ut_line, sizeof line);
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idx = ulog_ttyslot(line);
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if (idx > 0) {
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lseek(fd, (off_t)(idx * sizeof *ut), SEEK_SET);
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write(fd, ut, sizeof *ut);
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}
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close(fd);
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}
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static int
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ulog_write_utmp_slow(const struct futmp *ut)
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{
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struct futmp utf;
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int fd, found;
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if ((fd = open(_PATH_UTMP, O_RDWR, 0)) < 0)
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return (0);
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found = 0;
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while (read(fd, &utf, sizeof utf) == sizeof utf) {
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if (utf.ut_user[0] == '\0' ||
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strncmp(utf.ut_line, ut->ut_line, sizeof utf.ut_line) != 0)
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continue;
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lseek(fd, -(off_t)sizeof utf, SEEK_CUR);
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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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return (found);
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}
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static void
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ulog_write_wtmp(const struct futmp *ut)
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{
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int fd;
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if ((fd = open(_PATH_WTMP, O_WRONLY|O_APPEND, 0)) < 0)
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return;
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write(fd, ut, sizeof *ut);
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close(fd);
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}
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static void
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ulog_write_lastlog(const struct flastlog *ll, const char *user)
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{
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struct passwd *pw;
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int fd;
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if ((fd = open(_PATH_LASTLOG, O_WRONLY, 0)) < 0)
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return;
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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 *ll), SEEK_SET);
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write(fd, ll, sizeof *ll);
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}
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close(fd);
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}
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struct ulog_utmpx *
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ulog_pututxline(const struct ulog_utmpx *utmpx)
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{
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static struct ulog_utmpx utx;
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struct futmp ut;
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struct flastlog ll;
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char user[sizeof utmpx->ut_user + 1];
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switch (utmpx->ut_type) {
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case BOOT_TIME:
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case OLD_TIME:
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case NEW_TIME:
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case SHUTDOWN_TIME:
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ulog_utmpx_to_futmp(utmpx, &ut);
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/* Only log to wtmp. */
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ulog_write_wtmp(&ut);
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break;
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case USER_PROCESS:
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ulog_utmpx_to_futmp(utmpx, &ut);
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ulog_utmpx_to_flastlog(utmpx, &ll);
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/* Log to utmp, wtmp and lastlog. */
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ulog_write_utmp_fast(&ut);
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ulog_write_wtmp(&ut);
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strlcpy(user, utmpx->ut_user, sizeof user);
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ulog_write_lastlog(&ll, user);
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break;
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case DEAD_PROCESS:
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ulog_utmpx_to_futmp(utmpx, &ut);
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/* Only log to wtmp if logged in utmp. */
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if (ulog_write_utmp_slow(&ut))
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ulog_write_wtmp(&ut);
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break;
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default:
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return (NULL);
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}
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/* XXX: Can't we just return utmpx itself? */
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memcpy(&utx, utmpx, sizeof utx);
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utx.ut_user[sizeof utx.ut_user - 1] = '\0';
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utx.ut_line[sizeof utx.ut_line - 1] = '\0';
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utx.ut_host[sizeof utx.ut_host - 1] = '\0';
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return (&utx);
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}
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