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Massively extend libulog:

Browse Source 
- 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.
This commit is contained in:
Ed Schouten 2009-12-05 19:53:29 +00:00
parent 2c201a9afe
commit 42782e4717
Notes: svn2git 2020-12-20 02:59:44 +00:00 
svn path=/head/; revision=200153
11 changed files with 737 additions and 159 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

18
lib/libulog/Makefile
View File

@ -3,15 +3,25 @@
LIB= ulog
SHLIB_MAJOR= 0
INCS= ulog.h
SRCS= ulog.h ulog_getutxent.c ulog_internal.h \
ulog_login.c ulog_login_pseudo.c
SRCS= ulog.h ulog_getutxent.c ulog_internal.h ulog_login.c \
ulog_login_pseudo.c ulog_pututxline.c ulog_util.c
MAN= ulog_getutxent.3 ulog_login.3
MAN= ulog_getutxent.3 ulog_login.3 ulog_setutxfile.3
MLINKS+=ulog_getutxent.3 ulog_endutxent.3 \
ulog_getutxent.3 ulog_getutxline.3 \
ulog_getutxent.3 ulog_pututxline.3 \
ulog_getutxent.3 ulog_setutxent.3 \
ulog_login.3 ulog_login_pseudo.3 \
ulog_login.3 ulog_logout.3 \
ulog_login.3 ulog_logout_pseudo.3
ulog_login.3 ulog_logout_pseudo.3 \
ulog_setutxfile.3 ulog_getutxuser.3
# Add links to <utmpx.h>-style functions.
MLINKS+=ulog_endutxent.3 endutxent.3 \
ulog_getutxent.3 getutxent.3 \
ulog_getutxline.3 getutxline.3 \
ulog_pututxline.3 pututxline.3 \
ulog_setutxent.3 setutxent.3
WARNS?= 6

4
lib/libulog/Symbol.map
View File

@ -5,9 +5,13 @@
FBSD_1.2 {
ulog_endutxent;
ulog_getutxent;
ulog_getutxline;
ulog_getutxuser;
ulog_login;
ulog_login_pseudo;
ulog_logout;
ulog_logout_pseudo;
ulog_pututxline;
ulog_setutxent;
ulog_setutxfile;
};

66
lib/libulog/ulog.h
View File

@ -31,6 +31,12 @@
#include <sys/cdefs.h>
#include <sys/_timeval.h>
#include <sys/_types.h>
#ifndef _PID_T_DECLARED
typedef __pid_t pid_t;
#define _PID_T_DECLARED
#endif
/*
* libulog.
@ -42,61 +48,61 @@
* processes as well, provided that they hold a file descriptor to a
* pseudo-terminal master device.
*
* Unlike struct utmpx, the buffers containing the strings are not
* stored inside struct ulog_utmpx itself. Processes should never
* handcraft these structures anyway.
*
* This library (or at least parts of it) will hopefully deprecate over
* time, when we provide the <utmpx.h> API.
*/
#define _UTX_USERDISPSIZE 16
#define _UTX_LINEDISPSIZE 8
#define _UTX_HOSTDISPSIZE 16
struct ulog_utmpx {
char *ut_user;
#if 0
char *ut_id;
#endif
char *ut_line;
char *ut_host;
#if 0
pid_t ut_pid;
#endif
short ut_type;
char ut_user[32];
char ut_id[8]; /* XXX: unsupported. */
char ut_line[32];
char ut_host[256];
pid_t ut_pid; /* XXX: unsupported. */
short ut_type;
#define EMPTY 0
#if 0
#define BOOT_TIME 1
#endif
#define OLD_TIME 2
#define NEW_TIME 3
#define USER_PROCESS 4
#if 0
#define INIT_PROCESS 5
#define LOGIN_PROCESS 6
#endif
#define INIT_PROCESS 5 /* XXX: unsupported. */
#define LOGIN_PROCESS 6 /* XXX: unsupported. */
#define DEAD_PROCESS 7
#define SHUTDOWN_TIME 8
#define REBOOT_TIME 9
struct timeval ut_tv;
struct timeval ut_tv;
};
__BEGIN_DECLS
/* POSIX routines. */
void ulog_endutxent(void);
struct ulog_utmpx *ulog_getutxent(void);
#if 0
struct ulog_utmpx *ulog_getutxid(const struct ulog_utmpx *id);
struct ulog_utmpx *ulog_getutxline(const struct ulog_utmpx *line);
struct ulog_utmpx *ulog_pututxline(const struct ulog_utmpx *utmpx);
struct ulog_utmpx *ulog_getutxid(const struct ulog_utmpx *);
#endif
struct ulog_utmpx *ulog_getutxline(const struct ulog_utmpx *);
struct ulog_utmpx *ulog_pututxline(const struct ulog_utmpx *);
void ulog_setutxent(void);
/* Extensions. */
struct ulog_utmpx *ulog_getutxuser(const char *);
int ulog_setutxfile(int, const char *);
#define UTXF_UTMP 0
#define UTXF_WTMP 1
#define UTXF_LASTLOG 2
/* Login/logout utility functions. */
void ulog_login(const char *, const char *, const char *);
void ulog_login_pseudo(int, const char *);
void ulog_logout(const char *);
void ulog_logout_pseudo(int);
__END_DECLS
#ifdef _ULOG_POSIX_NAMES
#define utmpx ulog_utmpx
#define endutxent ulog_endutxent
#define getutxent ulog_getutxent
#define getutxline ulog_getutxline
#define pututxline ulog_pututxline
#define setutxent ulog_setutxent
#endif /* _ULOG_POSIX_NAMES */
#endif /* !_ULOG_H_ */

81
lib/libulog/ulog_getutxent.3
View File

@ -24,11 +24,13 @@
.\"
.\" $FreeBSD$
.\"
.Dd December 2, 2009
.Dd December 5, 2009
.Os
.Dt ULOG_GETUTXENT 3
.Sh NAME
.Nm ulog_getutxent ,
.Nm ulog_getutxline ,
.Nm ulog_pututxline ,
.Nm ulog_setutxent ,
.Nm ulog_endutxent
.Nd read user login records
@ -38,6 +40,10 @@
.In ulog.h
.Ft struct ulog_utmpx *
.Fn ulog_getutxent "void"
.Ft struct ulog_utmpx *
.Fn ulog_getutxline "const struct ulog_utmpx *line"
.Ft struct ulog_utmpx *
.Fn ulog_pututxline "const struct ulog_utmpx *utmpx"
.Ft void
.Fn ulog_setutxent "void"
.Ft void
@ -49,10 +55,12 @@ function returns a pointer to an object, with the following structure,
containing stored information of an active user login session.
.Bd -literal
struct ulog_utmpx {
char *ut_user; /* Username. */
char *ut_line; /* TTY device. */
char *ut_host; /* Remote hostname. */
short ut_type; /* Type of entry. */
char ut_user[]; /* Username. */
char ut_id[]; /* Private data. */
char ut_line[]; /* TTY device. */
char ut_host[]; /* Remote hostname. */
pid_t ut_pid; /* Process identifier. */
short ut_type; /* Type of entry. */
struct timeval ut_tv; /* Timestamp. */
};
.Ed
@ -61,6 +69,9 @@ The fields are as follows:
.Bl -tag -width ut_user
.It Fa ut_user
The username of the logged in user.
.It Fa ut_id
Private data that can be used to later identify the record.
This implementation is not capable of storing this value on disk.
.It Fa ut_line
The pathname of the TTY device, without the leading
.Pa /dev/
@ -68,6 +79,9 @@ directory.
.It Fa ut_host
An optional hostname of a remote system, if the login session is
provided through a networked login service.
.It Fa ut_pid
Process identifier of the session leader of the login session.
This implementation is not capable of storing this value on disk.
.It Fa ut_type
The
.Fa ut_type
@ -76,28 +90,42 @@ following values:
.Bl -tag -width SHUTDOWN_TIME
.It Dv EMPTY
No valid user accounting information.
.It Dv BOOT_TIME
Identifies time of system boot.
.It Dv OLD_TIME
Identifies time when system clock changed.
.It Dv NEW_TIME
Identifies time after system clock changed.
.It Dv USER_PROCESS
Identifies a process.
.It Dv INIT_PROCESS
Identifies a process spawned by the init process.
.It Dv LOGIN_PROCESS
Identifies the session leader of a logged-in user.
.It Dv DEAD_PROCESS
Identifies a session leader who has exited.
.It Dv SHUTDOWN_TIME
Identifies time when system was shut down.
.It Dv REBOOT_TIME
Identifies time when system was rebooted.
.El
.It Fa ut_tv
Timestamp indicating when the entry was last modified.
.El
.Pp
This implementation guarantees all strings returned in the structure to
be null terminated.
.Pp
The
.Fn ulog_getutxent
function reads the next entry from the utmp file, opening the file if
necessary.
The
.Fn ulog_getutxline
function reads entries from the utmp file, until finding an entry which
shares the same
.Fa ut_line
as the structure
.Fa line .
The
.Fn ulog_setutxent
opens the file, closing it first if already opened.
The
@ -106,15 +134,50 @@ function closes any open files.
.Pp
The
.Fn ulog_getutxent
function reads from the beginning of the file until and EOF is
and
.Fn ulog_getutxline
functions read from the beginning of the file until and EOF is
encountered.
.Pp
The
.Fn ulog_pututxline
function writes a new entry to the file.
.Sh RETURN VALUES
The
.Fn ulog_getutxent
function returns a null pointer on EOF or error.
and
.Fn ulog_getutxline
functions return a null pointer on EOF or error.
.Sh SEE ALSO
.Xr ulog_login 3 ,
.Xr ulog_setutxfile 3 ,
.Xr utmp 5
.Sh STANDARDS
This interface is similar to
.In utmpx.h
described in
.St -p1003.1-2008 ,
but incompatible.
The underlying file format does not allow a correctly behaving
implementation of the standardized interface.
.Pp
This programming interface has been designed to ease the migration
towards
.In utmpx.h .
If
.Dv _ULOG_POSIX_NAMES
is set before inclusion of
.In ulog.h ,
it is also possible to use the
.Vt utmpx
structure and the
.Fn getutxent ,
.Fn getutxline ,
.Fn pututxline ,
.Fn setutxent
and
.Fn endutxent
functions.
.Sh HISTORY
These functions appeared in
.Fx 9.0 .

275
lib/libulog/ulog_getutxent.c
View File

@ -27,6 +27,9 @@
#include <sys/cdefs.h>
__FBSDID("$FreeBSD$");
#include <sys/param.h>
#include <pwd.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
@ -35,6 +38,7 @@ __FBSDID("$FreeBSD$");
#include "ulog_internal.h"
static FILE *ufile;
static int ufiletype = -1;
void
ulog_endutxent(void)
@ -44,56 +48,255 @@ ulog_endutxent(void)
ufile = NULL;
}
struct ulog_utmpx *
ulog_getutxent(void)
/*
* Conversion from on-disk formats to generic ulog_utmpx structure.
*/
static void
ulog_futmp_to_utmpx(const struct futmp *ut, struct ulog_utmpx *utx)
{
memset(utx, 0, sizeof *utx);
#define COPY_STRING(field) do { \
strncpy(utx->ut_ ## field, ut->ut_ ## field, \
MIN(sizeof utx->ut_ ## field - 1, sizeof ut->ut_ ## field));\
} while (0)
COPY_STRING(user);
COPY_STRING(line);
COPY_STRING(host);
#undef COPY_STRING
#define MATCH(field, value) (strcmp(utx->ut_ ## field, (value)) == 0)
if (MATCH(user, "reboot") && MATCH(line, "~"))
utx->ut_type = BOOT_TIME;
else if (MATCH(user, "date") && MATCH(line, "|"))
utx->ut_type = OLD_TIME;
else if (MATCH(user, "date") && MATCH(line, "{"))
utx->ut_type = NEW_TIME;
else if (MATCH(user, "shutdown") && MATCH(line, "~"))
utx->ut_type = SHUTDOWN_TIME;
else if (MATCH(user, "") && MATCH(host, ""))
utx->ut_type = DEAD_PROCESS;
else if (!MATCH(user, "") && !MATCH(line, "") && ut->ut_time != 0)
utx->ut_type = USER_PROCESS;
else
utx->ut_type = EMPTY;
utx->ut_tv.tv_sec = _time32_to_time(ut->ut_time);
utx->ut_tv.tv_usec = 0;
}
static void
ulog_flastlog_to_utmpx(const struct flastlog *ll, struct ulog_utmpx *utx)
{
memset(utx, 0, sizeof *utx);
#define COPY_STRING(field) do { \
strncpy(utx->ut_ ## field, ll->ll_ ## field, \
MIN(sizeof utx->ut_ ## field - 1, sizeof ll->ll_ ## field));\
} while (0)
COPY_STRING(line);
COPY_STRING(host);
#undef COPY_STRING
if (!MATCH(line, "") && ll->ll_time != 0)
utx->ut_type = USER_PROCESS;
else
utx->ut_type = EMPTY;
utx->ut_tv.tv_sec = _time32_to_time(ll->ll_time);
utx->ut_tv.tv_usec = 0;
}
/*
* File I/O.
*/
static inline off_t
ulog_tell(void)
{
if (ufiletype == UTXF_LASTLOG)
return (ftello(ufile) / sizeof(struct flastlog));
else
return (ftello(ufile) / sizeof(struct futmp));
}
static struct ulog_utmpx *
ulog_read(off_t off, int whence, int resolve_user)
{
struct futmp ut;
static struct ulog_utmpx utx;
/* Open the utmp file if not already done so. */
if (ufile == NULL)
ulog_setutxent();
if (ufile == NULL)
return (NULL);
if (fread(&ut, sizeof ut, 1, ufile) != 1)
/* Only allow seeking to move forward. */
if (whence == SEEK_SET && ulog_tell() > off)
return (NULL);
#define COPY_STRING(field) do { \
free(utx.ut_ ## field); \
utx.ut_ ## field = strndup(ut.ut_ ## field, \
sizeof ut.ut_ ## field); \
if (utx.ut_ ## field == NULL) \
utx.ut_ ## field = __DECONST(char *, ""); \
} while (0)
COPY_STRING(user);
COPY_STRING(line);
COPY_STRING(host);
utx.ut_tv.tv_sec = _time32_to_time(ut.ut_time);
utx.ut_tv.tv_usec = 0;
#define MATCH(field, value) (strcmp(utx.ut_ ## field, (value)) == 0)
if (MATCH(user, "date") && MATCH(line, "|"))
utx.ut_type = OLD_TIME;
else if (MATCH(user, "date") && MATCH(line, "{"))
utx.ut_type = NEW_TIME;
else if (MATCH(user, "shutdown") && MATCH(line, "~"))
utx.ut_type = SHUTDOWN_TIME;
else if (MATCH(user, "reboot") && MATCH(line, "~"))
utx.ut_type = REBOOT_TIME;
else if (MATCH(user, "") && MATCH(host, ""))
utx.ut_type = DEAD_PROCESS;
else if (!MATCH(user, ""))
utx.ut_type = USER_PROCESS;
else
utx.ut_type = EMPTY;
if (ufiletype == UTXF_LASTLOG) {
struct flastlog ll;
struct passwd *pw = NULL;
uid_t uid;
if (fseeko(ufile, off * sizeof ll, whence) != 0)
return (NULL);
uid = ulog_tell();
if (fread(&ll, sizeof ll, 1, ufile) != 1)
return (NULL);
ulog_flastlog_to_utmpx(&ll, &utx);
if (utx.ut_type == USER_PROCESS && resolve_user)
pw = getpwuid(uid);
if (pw != NULL)
strlcpy(utx.ut_user, pw->pw_name, sizeof utx.ut_user);
else
sprintf(utx.ut_user, "%u", (unsigned int)uid);
} else {
struct futmp ut;
if (fseeko(ufile, off * sizeof(struct futmp), whence) != 0)
return (NULL);
if (fread(&ut, sizeof ut, 1, ufile) != 1)
return (NULL);
ulog_futmp_to_utmpx(&ut, &utx);
}
return (&utx);
}
/*
* getutxent().
*
* Read the next entry from the file.
*/
struct ulog_utmpx *
ulog_getutxent(void)
{
return ulog_read(0, SEEK_CUR, 1);
}
/*
* ulog_getutxline().
*
* Read entries from the file, until reaching an entry which matches the
* provided TTY device name. We can optimize the case for utmp files,
* because they are indexed by TTY device name.
*/
struct ulog_utmpx *
ulog_getutxline(const struct ulog_utmpx *line)
{
struct ulog_utmpx *utx;
if (ufile == NULL)
ulog_setutxent();
if (ufile == NULL)
return (NULL);
if (ufiletype == UTXF_UTMP) {
unsigned int slot;
slot = ulog_ttyslot(line->ut_line);
if (slot == 0)
return (NULL);
utx = ulog_read(slot, SEEK_SET, 1);
if (utx->ut_type == USER_PROCESS &&
strcmp(utx->ut_line, line->ut_line) == 0)
return (utx);
return (NULL);
} else {
for (;;) {
utx = ulog_read(0, SEEK_CUR, 1);
if (utx == NULL)
return (NULL);
if (utx->ut_type == USER_PROCESS &&
strcmp(utx->ut_line, line->ut_line) == 0)
return (utx);
}
}
}
/*
* ulog_getutxuser().
*
* Read entries from the file, until reaching an entry which matches the
* provided username. We can optimize the case for lastlog files,
* because they are indexed by user ID.
*/
struct ulog_utmpx *
ulog_getutxuser(const char *user)
{
struct ulog_utmpx *utx;
if (ufiletype == UTXF_LASTLOG) {
struct passwd *pw;
pw = getpwnam(user);
if (pw == NULL)
return (NULL);
utx = ulog_read(pw->pw_uid, SEEK_SET, 0);
if (utx != NULL)
strlcpy(utx->ut_user, user, sizeof utx->ut_user);
return (utx);
} else {
for (;;) {
utx = ulog_read(0, SEEK_CUR, 1);
if (utx == NULL)
return (NULL);
if (utx->ut_type == USER_PROCESS &&
strcmp(utx->ut_user, user) == 0)
return (utx);
}
}
}
/*
* ulog_setutxfile().
*
* Switch to a different record file. When no filename is provided, the
* system default is opened.
*/
int
ulog_setutxfile(int type, const char *file)
{
/* Supply default files. */
switch (type) {
case UTXF_UTMP:
if (file == NULL)
file = _PATH_UTMP;
break;
case UTXF_WTMP:
if (file == NULL)
file = _PATH_WTMP;
break;
case UTXF_LASTLOG:
if (file == NULL)
file = _PATH_LASTLOG;
break;
default:
return (-1);
}
if (ufile != NULL)
fclose(ufile);
ufile = fopen(file, "r");
ufiletype = type;
if (ufile == NULL)
return (-1);
return (0);
}
/*
* ulog_endutxfile().
*
* Close any opened files.
*/
void
ulog_setutxent(void)
{
if (ufile != NULL)
fclose(ufile);
ufile = fopen(_PATH_UTMP, "r");
ulog_setutxfile(UTXF_UTMP, NULL);
}

2
lib/libulog/ulog_internal.h
View File

@ -33,6 +33,8 @@
#include "ulog.h"
unsigned int ulog_ttyslot(const char *);
/*
* On-disk format.
*/

2
lib/libulog/ulog_login.3
View File

@ -24,7 +24,7 @@
.\"
.\" $FreeBSD$
.\"
.Dd December 2, 2009
.Dd December 5, 2009
.Os
.Dt ULOG_LOGIN 3
.Sh NAME

97
lib/libulog/ulog_login.c
View File

@ -27,109 +27,48 @@
#include <sys/cdefs.h>
__FBSDID("$FreeBSD$");
#include <fcntl.h>
#include <inttypes.h>
#include <sys/time.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;
struct ulog_utmpx utx;
/* 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));
memset(&utx, 0, sizeof utx);
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);
/* XXX: ut_id, ut_pid missing. */
utx.ut_type = USER_PROCESS;
strncpy(utx.ut_line, line, sizeof utx.ut_line);
strncpy(utx.ut_user, user, sizeof utx.ut_user);
strncpy(utx.ut_host, host, sizeof utx.ut_host);
gettimeofday(&utx.ut_tv, NULL);
/* 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);
}
ulog_pututxline(&utx);
}
void
ulog_logout(const char *line)
{
struct futmp ut;
int fd, found;
struct ulog_utmpx utx;
/* 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;
memset(&utx, 0, sizeof utx);
/* 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);
}
/* XXX: ut_id, ut_pid missing. ut_line not needed */
utx.ut_type = DEAD_PROCESS;
strncpy(utx.ut_line, line, sizeof utx.ut_line);
gettimeofday(&utx.ut_tv, NULL);
ulog_pututxline(&utx);
}

208
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/*-
* 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 <sys/param.h>
#include <fcntl.h>
#include <pwd.h>
#include <string.h>
#include <timeconv.h>
#include <unistd.h>
#include "ulog_internal.h"
static void
ulog_utmpx_to_futmp(const struct ulog_utmpx *utx, struct futmp *ut)
{
memset(ut, 0, sizeof *ut);
#define COPY_STRING(field) do { \
strncpy(ut->ut_ ## field, utx->ut_ ## field, \
MIN(sizeof ut->ut_ ## field, sizeof utx->ut_ ## field)); \
} while (0)
switch (utx->ut_type) {
case BOOT_TIME:
strcpy(ut->ut_user, "reboot");
ut->ut_line[0] = '~';
break;
case OLD_TIME:
strcpy(ut->ut_user, "date");
ut->ut_line[0] = '|';
break;
case NEW_TIME:
strcpy(ut->ut_user, "date");
ut->ut_line[0] = '{';
break;
case USER_PROCESS:
COPY_STRING(user);
COPY_STRING(line);
COPY_STRING(host);
break;
case DEAD_PROCESS:
COPY_STRING(line);
break;
case SHUTDOWN_TIME:
strcpy(ut->ut_user, "shutdown");
ut->ut_line[0] = '~';
break;
}
#undef COPY_STRING
ut->ut_time = _time_to_time32(utx->ut_tv.tv_sec);
}
static void
ulog_utmpx_to_flastlog(const struct ulog_utmpx *utx, struct flastlog *ll)
{
memset(ll, 0, sizeof *ll);
#define COPY_STRING(field) do { \
strncpy(ll->ll_ ## field, utx->ut_ ## field, \
MIN(sizeof ll->ll_ ## field, sizeof utx->ut_ ## field)); \
} while (0)
switch (utx->ut_type) {
case USER_PROCESS:
COPY_STRING(line);
COPY_STRING(host);
break;
}
#undef COPY_STRING
ll->ll_time = _time_to_time32(utx->ut_tv.tv_sec);
}
static void
ulog_write_utmp_fast(const struct futmp *ut)
{
unsigned int idx;
char line[sizeof ut->ut_line + 1];
int fd;
if ((fd = open(_PATH_UTMP, O_WRONLY|O_CREAT, 0644)) < 0)
return;
strlcpy(line, ut->ut_line, sizeof line);
idx = ulog_ttyslot(line);
if (idx > 0) {
lseek(fd, (off_t)(idx * sizeof *ut), SEEK_SET);
write(fd, ut, sizeof *ut);
}
close(fd);
}
static int
ulog_write_utmp_slow(const struct futmp *ut)
{
struct futmp utf;
int fd, found;
if ((fd = open(_PATH_UTMP, O_RDWR, 0)) < 0)
return (0);
found = 0;
while (read(fd, &utf, sizeof utf) == sizeof utf) {
if (utf.ut_user[0] == '\0' ||
strncmp(utf.ut_line, ut->ut_line, sizeof utf.ut_line) != 0)
continue;
lseek(fd, -(off_t)sizeof utf, SEEK_CUR);
write(fd, &ut, sizeof ut);
found = 1;
}
close(fd);
return (found);
}
static void
ulog_write_wtmp(const struct futmp *ut)
{
int fd;
if ((fd = open(_PATH_WTMP, O_WRONLY|O_APPEND, 0)) < 0)
return;
write(fd, ut, sizeof *ut);
close(fd);
}
static void
ulog_write_lastlog(const struct flastlog *ll, const char *user)
{
struct passwd *pw;
int fd;
if ((fd = open(_PATH_LASTLOG, O_WRONLY, 0)) < 0)
return;
pw = getpwnam(user);
if (pw != NULL) {
lseek(fd, (off_t)(pw->pw_uid * sizeof *ll), SEEK_SET);
write(fd, ll, sizeof *ll);
}
close(fd);
}
struct ulog_utmpx *
ulog_pututxline(const struct ulog_utmpx *utmpx)
{
static struct ulog_utmpx utx;
struct futmp ut;
struct flastlog ll;
char user[sizeof utmpx->ut_user + 1];
switch (utmpx->ut_type) {
case BOOT_TIME:
case OLD_TIME:
case NEW_TIME:
case SHUTDOWN_TIME:
ulog_utmpx_to_futmp(utmpx, &ut);
/* Only log to wtmp. */
ulog_write_wtmp(&ut);
break;
case USER_PROCESS:
ulog_utmpx_to_futmp(utmpx, &ut);
ulog_utmpx_to_flastlog(utmpx, &ll);
/* Log to utmp, wtmp and lastlog. */
ulog_write_utmp_fast(&ut);
ulog_write_wtmp(&ut);
strlcpy(user, utmpx->ut_user, sizeof user);
ulog_write_lastlog(&ll, user);
break;
case DEAD_PROCESS:
ulog_utmpx_to_futmp(utmpx, &ut);
/* Only log to wtmp if logged in utmp. */
if (ulog_write_utmp_slow(&ut))
ulog_write_wtmp(&ut);
break;
default:
return (NULL);
}
/* XXX: Can't we just return utmpx itself? */
memcpy(&utx, utmpx, sizeof utx);
utx.ut_user[sizeof utx.ut_user - 1] = '\0';
utx.ut_line[sizeof utx.ut_line - 1] = '\0';
utx.ut_host[sizeof utx.ut_host - 1] = '\0';
return (&utx);
}

94
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.\" 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.
.\"
.\" $FreeBSD$
.\"
.Dd December 5, 2009
.Os
.Dt ULOG_SETUTXFILE 3
.Sh NAME
.Nm ulog_setutxfile ,
.Nm ulog_getutxuser
.Nd additional user login records management
.Sh LIBRARY
.Lb libulog
.Sh SYNOPSIS
.In ulog.h
.Ft int
.Fn ulog_setutxfile "int type" "const char *file"
.Ft struct ulog_utmpx *
.Fn ulog_getutxuser "const char *user"
.Sh DESCRIPTION
The
.Fn ulog_setutxfile
and
.Fn ulog_getutxuser
functions are extensions to the standard
.In ulog.h
interface.
.Pp
The
.Fn ulog_setutxfile
function is similar to
.Fn ulog_setutxent ,
but is capable of returning an error code and also gives access to other
login record files by using one of the following values for
.Fa type :
.Bl -tag -width UTXF_LASTLOG
.It Dv UTXF_UTMP
Open the default
.Nm utmp
file, which is indexed by TTY device.
.It Dv UTXF_WTMP
Open the
.Nm wtmp
file, which is indexed by time.
.It Dv UTXF_LASTLOG
Open the
.Nm lastlog
file, which is indexed by user ID.
.El
.Pp
The
.Fa file
argument determines the file to be opened.
If left null, implementation-defined default file is opened.
.Pp
The
.Fn ulog_getutxuser
searches the currently opened file until an entry is found whose
.Fa ut_user
is equal to the
.Fa user
argument.
.Sh RETURN VALUES
If succesful,
.Fn ulog_setutxfile
returns 0.
It returns -1 on failure.
.Sh SEE ALSO
.Xr ulog_getutxent 3
.Sh HISTORY
These functions appeared in
.Fx 9.0 .

49
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/*-
* 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 <string.h>
#include <ttyent.h>
#include "ulog_internal.h"
unsigned int
ulog_ttyslot(const char *name)
{
struct ttyent *ty;
unsigned int slot;
setttyent();
for (slot = 1; (ty = getttyent()) != NULL; ++slot)
if (strcmp(ty->ty_name, name) == 0) {
endttyent();
return (slot);
}
endttyent();
return (0);
}