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author | ed <ed@FreeBSD.org> | 2009-12-03 15:48:24 +0000 |
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committer | ed <ed@FreeBSD.org> | 2009-12-03 15:48:24 +0000 |
commit | 879c7d27302e0fb0654529de4b88f210ee11b022 (patch) | |
tree | c0f0fe174257910e3a7d7dcda57958d8ade8bfa9 /lib/libulog/ulog_login.c | |
parent | b6cdcc994062fb93affd9d473219a5f06d4029ff (diff) | |
download | FreeBSD-src-879c7d27302e0fb0654529de4b88f210ee11b022.zip FreeBSD-src-879c7d27302e0fb0654529de4b88f210ee11b022.tar.gz |
Add a new library: libulog.
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>.
Diffstat (limited to 'lib/libulog/ulog_login.c')
-rw-r--r-- | lib/libulog/ulog_login.c | 135 |
1 files changed, 135 insertions, 0 deletions
diff --git a/lib/libulog/ulog_login.c b/lib/libulog/ulog_login.c new file mode 100644 index 0000000..22de619 --- /dev/null +++ b/lib/libulog/ulog_login.c @@ -0,0 +1,135 @@ +/*- + * Copyright (c) 2009 Ed Schouten <ed@FreeBSD.org> + * All rights reserved. + * + * 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. + * + * THIS SOFTWARE IS PROVIDED BY THE AUTHOR 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 AUTHOR 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. + */ + +#include <sys/cdefs.h> +__FBSDID("$FreeBSD$"); + +#include <fcntl.h> +#include <inttypes.h> +#include <paths.h> +#include <pwd.h> +#include <string.h> +#include <unistd.h> +#include <time.h> +#include <timeconv.h> +#include <ttyent.h> + +#include "ulog_internal.h" + +void +ulog_login(const char *line, const char *user, const char *host) +{ + struct futmp fu; + struct flastlog fl; + int fd; + + /* Remove /dev/ component. */ + if (strncmp(line, _PATH_DEV, sizeof _PATH_DEV - 1) == 0) + line += sizeof _PATH_DEV - 1; + + /* Prepare log entries. */ + memset(&fu, 0, sizeof fu); + strlcpy(fu.ut_line, line, sizeof fu.ut_line); + strlcpy(fu.ut_user, user, sizeof fu.ut_user); + if (host != NULL) + strlcpy(fu.ut_host, host, sizeof fu.ut_host); + fu.ut_time = _time_to_time32(time(NULL)); + + fl.ll_time = fu.ut_time; + memcpy(fl.ll_line, fu.ut_line, sizeof fl.ll_line); + memcpy(fl.ll_host, fu.ut_host, sizeof fl.ll_host); + + /* Update utmp entry. */ + if ((fd = open(_PATH_UTMP, O_WRONLY|O_CREAT, 0644)) >= 0) { + struct ttyent *ty; + int idx; + + setttyent(); + for (idx = 1; (ty = getttyent()) != NULL; ++idx) { + if (strcmp(ty->ty_name, line) != 0) + continue; + lseek(fd, (off_t)(idx * sizeof fu), L_SET); + write(fd, &fu, sizeof fu); + break; + } + endttyent(); + close(fd); + } + + /* Add wtmp entry. */ + if ((fd = open(_PATH_WTMP, O_WRONLY|O_APPEND, 0)) >= 0) { + write(fd, &fu, sizeof fu); + close(fd); + } + + /* Update lastlog entry. */ + if ((fd = open(_PATH_LASTLOG, O_WRONLY, 0)) >= 0) { + struct passwd *pw; + + pw = getpwnam(user); + if (pw != NULL) { + lseek(fd, (off_t)(pw->pw_uid * sizeof fl), L_SET); + write(fd, &fl, sizeof fl); + } + close(fd); + } +} + +void +ulog_logout(const char *line) +{ + struct futmp ut; + int fd, found; + + /* Remove /dev/ component. */ + if (strncmp(line, _PATH_DEV, sizeof _PATH_DEV - 1) == 0) + line += sizeof _PATH_DEV - 1; + + /* Mark entry in utmp as logged out. */ + if ((fd = open(_PATH_UTMP, O_RDWR, 0)) < 0) + return; + found = 0; + while (read(fd, &ut, sizeof ut) == sizeof ut) { + if (ut.ut_user[0] == '\0' || + strncmp(ut.ut_line, line, sizeof ut.ut_line) != 0) + continue; + memset(ut.ut_user, 0, sizeof ut.ut_user); + memset(ut.ut_host, 0, sizeof ut.ut_host); + ut.ut_time = _time_to_time32(time(NULL)); + lseek(fd, -(off_t)sizeof ut, L_INCR); + write(fd, &ut, sizeof ut); + found = 1; + } + close(fd); + if (!found) + return; + + /* utmp entry found. Also add logout entry to wtmp. */ + if ((fd = open(_PATH_WTMP, O_WRONLY|O_APPEND, 0)) >= 0) { + write(fd, &ut, sizeof ut); + close(fd); + } +} |