283 lines
7.4 KiB
C
283 lines
7.4 KiB
C
/*
|
|
* SPDX-FileCopyrightText: 1989 - 1994, Julianne Frances Haugh
|
|
* SPDX-FileCopyrightText: 1996 - 1999, Marek Michałkiewicz
|
|
* SPDX-FileCopyrightText: 2001 - 2005, Tomasz Kłoczko
|
|
* SPDX-FileCopyrightText: 2008 - 2009, Nicolas François
|
|
*
|
|
* SPDX-License-Identifier: BSD-3-Clause
|
|
*/
|
|
|
|
#include <config.h>
|
|
|
|
#include "defines.h"
|
|
#include "prototypes.h"
|
|
|
|
#include <utmp.h>
|
|
#include <assert.h>
|
|
#include <sys/param.h>
|
|
#include <sys/types.h>
|
|
#include <sys/socket.h>
|
|
#include <netdb.h>
|
|
#include <stdio.h>
|
|
|
|
#ident "$Id$"
|
|
|
|
|
|
/*
|
|
* is_my_tty -- determine if "tty" is the same TTY stdin is using
|
|
*/
|
|
static bool is_my_tty (const char *tty)
|
|
{
|
|
/* full_tty shall be at least sizeof utmp.ut_line + 5 */
|
|
char full_tty[200];
|
|
/* tmptty shall be bigger than full_tty */
|
|
static char tmptty[sizeof (full_tty)+1];
|
|
|
|
if ('/' != *tty) {
|
|
(void) snprintf (full_tty, sizeof full_tty, "/dev/%s", tty);
|
|
tty = &full_tty[0];
|
|
}
|
|
|
|
if ('\0' == tmptty[0]) {
|
|
const char *tname = ttyname (STDIN_FILENO);
|
|
if (NULL != tname)
|
|
(void) strlcpy (tmptty, tname, sizeof tmptty);
|
|
}
|
|
|
|
if ('\0' == tmptty[0]) {
|
|
(void) puts (_("Unable to determine your tty name."));
|
|
exit (EXIT_FAILURE);
|
|
} else if (strncmp (tty, tmptty, sizeof (tmptty)) != 0) {
|
|
return false;
|
|
} else {
|
|
return true;
|
|
}
|
|
}
|
|
|
|
/*
|
|
* get_current_utmp - return the most probable utmp entry for the current
|
|
* session
|
|
*
|
|
* The utmp file is scanned for an entry with the same process ID.
|
|
* The line entered by the *getty / telnetd, etc. should also match
|
|
* the current terminal.
|
|
*
|
|
* When an entry is returned by get_current_utmp, and if the utmp
|
|
* structure has a ut_id field, this field should be used to update
|
|
* the entry information.
|
|
*
|
|
* Return NULL if no entries exist in utmp for the current process.
|
|
*/
|
|
/*@null@*/ /*@only@*/struct utmp *get_current_utmp (void)
|
|
{
|
|
struct utmp *ut;
|
|
struct utmp *ret = NULL;
|
|
|
|
setutent ();
|
|
|
|
/* First, try to find a valid utmp entry for this process. */
|
|
while ((ut = getutent ()) != NULL) {
|
|
if ( (ut->ut_pid == getpid ())
|
|
#ifdef HAVE_STRUCT_UTMP_UT_ID
|
|
&& ('\0' != ut->ut_id[0])
|
|
#endif
|
|
#ifdef HAVE_STRUCT_UTMP_UT_TYPE
|
|
&& ( (LOGIN_PROCESS == ut->ut_type)
|
|
|| (USER_PROCESS == ut->ut_type))
|
|
#endif
|
|
/* A process may have failed to close an entry
|
|
* Check if this entry refers to the current tty */
|
|
&& is_my_tty (ut->ut_line)) {
|
|
break;
|
|
}
|
|
}
|
|
|
|
if (NULL != ut) {
|
|
ret = (struct utmp *) xmalloc (sizeof (*ret));
|
|
memcpy (ret, ut, sizeof (*ret));
|
|
}
|
|
|
|
endutent ();
|
|
|
|
return ret;
|
|
}
|
|
|
|
|
|
#ifndef USE_PAM
|
|
/*
|
|
* Some systems already have updwtmp() and possibly updwtmpx(). Others
|
|
* don't, so we re-implement these functions if necessary.
|
|
*/
|
|
#ifndef HAVE_UPDWTMP
|
|
static void updwtmp (const char *filename, const struct utmp *ut)
|
|
{
|
|
int fd;
|
|
|
|
fd = open (filename, O_APPEND | O_WRONLY, 0);
|
|
if (fd >= 0) {
|
|
write (fd, ut, sizeof (*ut));
|
|
close (fd);
|
|
}
|
|
}
|
|
#endif /* ! HAVE_UPDWTMP */
|
|
|
|
#endif /* ! USE_PAM */
|
|
|
|
|
|
/*
|
|
* prepare_utmp - prepare an utmp entry so that it can be logged in a
|
|
* utmp/wtmp file.
|
|
*
|
|
* It accepts an utmp entry in input (ut) to return an entry with
|
|
* the right ut_id. This is typically an entry returned by
|
|
* get_current_utmp
|
|
* If ut is NULL, ut_id will be forged based on the line argument.
|
|
*
|
|
* The ut_host field of the input structure may also be kept, and is
|
|
* used to define the ut_addr/ut_addr_v6 fields. (if these fields
|
|
* exist)
|
|
*
|
|
* Other fields are discarded and filed with new values (if they
|
|
* exist).
|
|
*
|
|
* The returned structure shall be freed by the caller.
|
|
*/
|
|
/*@only@*/struct utmp *prepare_utmp (const char *name,
|
|
const char *line,
|
|
const char *host,
|
|
/*@null@*/const struct utmp *ut)
|
|
{
|
|
struct timeval tv;
|
|
char *hostname = NULL;
|
|
struct utmp *utent;
|
|
|
|
assert (NULL != name);
|
|
assert (NULL != line);
|
|
|
|
|
|
|
|
if ( (NULL != host)
|
|
&& ('\0' != host[0])) {
|
|
hostname = (char *) xmalloc (strlen (host) + 1);
|
|
strcpy (hostname, host);
|
|
#ifdef HAVE_STRUCT_UTMP_UT_HOST
|
|
} else if ( (NULL != ut)
|
|
&& ('\0' != ut->ut_host[0])) {
|
|
hostname = (char *) xmalloc (sizeof (ut->ut_host) + 1);
|
|
strncpy (hostname, ut->ut_host, sizeof (ut->ut_host));
|
|
hostname[sizeof (ut->ut_host)] = '\0';
|
|
#endif /* HAVE_STRUCT_UTMP_UT_HOST */
|
|
}
|
|
|
|
if (strncmp(line, "/dev/", 5) == 0) {
|
|
line += 5;
|
|
}
|
|
|
|
|
|
utent = (struct utmp *) xcalloc (1, sizeof (*utent));
|
|
|
|
|
|
#ifdef HAVE_STRUCT_UTMP_UT_TYPE
|
|
utent->ut_type = USER_PROCESS;
|
|
#endif /* HAVE_STRUCT_UTMP_UT_TYPE */
|
|
utent->ut_pid = getpid ();
|
|
strncpy (utent->ut_line, line, sizeof (utent->ut_line) - 1);
|
|
#ifdef HAVE_STRUCT_UTMP_UT_ID
|
|
if (NULL != ut) {
|
|
strncpy (utent->ut_id, ut->ut_id, sizeof (utent->ut_id));
|
|
} else {
|
|
/* XXX - assumes /dev/tty?? */
|
|
strncpy (utent->ut_id, line + 3, sizeof (utent->ut_id) - 1);
|
|
}
|
|
#endif /* HAVE_STRUCT_UTMP_UT_ID */
|
|
#ifdef HAVE_STRUCT_UTMP_UT_NAME
|
|
strncpy (utent->ut_name, name, sizeof (utent->ut_name));
|
|
#endif /* HAVE_STRUCT_UTMP_UT_NAME */
|
|
#ifdef HAVE_STRUCT_UTMP_UT_USER
|
|
strncpy (utent->ut_user, name, sizeof (utent->ut_user) - 1);
|
|
#endif /* HAVE_STRUCT_UTMP_UT_USER */
|
|
if (NULL != hostname) {
|
|
struct addrinfo *info = NULL;
|
|
#ifdef HAVE_STRUCT_UTMP_UT_HOST
|
|
strncpy (utent->ut_host, hostname, sizeof (utent->ut_host) - 1);
|
|
#endif /* HAVE_STRUCT_UTMP_UT_HOST */
|
|
#ifdef HAVE_STRUCT_UTMP_UT_SYSLEN
|
|
utent->ut_syslen = MIN (strlen (hostname),
|
|
sizeof (utent->ut_host));
|
|
#endif /* HAVE_STRUCT_UTMP_UT_SYSLEN */
|
|
#if defined(HAVE_STRUCT_UTMP_UT_ADDR) || defined(HAVE_STRUCT_UTMP_UT_ADDR_V6)
|
|
if (getaddrinfo (hostname, NULL, NULL, &info) == 0) {
|
|
/* getaddrinfo might not be reliable.
|
|
* Just try to log what may be useful.
|
|
*/
|
|
if (info->ai_family == AF_INET) {
|
|
struct sockaddr_in *sa =
|
|
(struct sockaddr_in *) info->ai_addr;
|
|
#ifdef HAVE_STRUCT_UTMP_UT_ADDR
|
|
memcpy (&(utent->ut_addr),
|
|
&(sa->sin_addr),
|
|
MIN (sizeof (utent->ut_addr),
|
|
sizeof (sa->sin_addr)));
|
|
#endif /* HAVE_STRUCT_UTMP_UT_ADDR */
|
|
#ifdef HAVE_STRUCT_UTMP_UT_ADDR_V6
|
|
memcpy (utent->ut_addr_v6,
|
|
&(sa->sin_addr),
|
|
MIN (sizeof (utent->ut_addr_v6),
|
|
sizeof (sa->sin_addr)));
|
|
} else if (info->ai_family == AF_INET6) {
|
|
struct sockaddr_in6 *sa =
|
|
(struct sockaddr_in6 *) info->ai_addr;
|
|
memcpy (utent->ut_addr_v6,
|
|
&(sa->sin6_addr),
|
|
MIN (sizeof (utent->ut_addr_v6),
|
|
sizeof (sa->sin6_addr)));
|
|
#endif /* HAVE_STRUCT_UTMP_UT_ADDR_V6 */
|
|
}
|
|
freeaddrinfo (info);
|
|
}
|
|
#endif /* HAVE_STRUCT_UTMP_UT_ADDR || HAVE_STRUCT_UTMP_UT_ADDR_V6 */
|
|
free (hostname);
|
|
}
|
|
/* ut_exit is only for DEAD_PROCESS */
|
|
utent->ut_session = getsid (0);
|
|
if (gettimeofday (&tv, NULL) == 0) {
|
|
#ifdef HAVE_STRUCT_UTMP_UT_TIME
|
|
utent->ut_time = tv.tv_sec;
|
|
#endif /* HAVE_STRUCT_UTMP_UT_TIME */
|
|
#ifdef HAVE_STRUCT_UTMP_UT_XTIME
|
|
utent->ut_xtime = tv.tv_usec;
|
|
#endif /* HAVE_STRUCT_UTMP_UT_XTIME */
|
|
#ifdef HAVE_STRUCT_UTMP_UT_TV
|
|
utent->ut_tv.tv_sec = tv.tv_sec;
|
|
utent->ut_tv.tv_usec = tv.tv_usec;
|
|
#endif /* HAVE_STRUCT_UTMP_UT_TV */
|
|
}
|
|
|
|
return utent;
|
|
}
|
|
|
|
/*
|
|
* setutmp - Update an entry in utmp and log an entry in wtmp
|
|
*
|
|
* Return 1 on failure and 0 on success.
|
|
*/
|
|
int setutmp (struct utmp *ut)
|
|
{
|
|
int err = 0;
|
|
|
|
assert (NULL != ut);
|
|
|
|
setutent ();
|
|
if (pututline (ut) == NULL) {
|
|
err = 1;
|
|
}
|
|
endutent ();
|
|
|
|
#ifndef USE_PAM
|
|
/* This is done by pam_lastlog */
|
|
updwtmp (_WTMP_FILE, ut);
|
|
#endif /* ! USE_PAM */
|
|
|
|
return err;
|
|
}
|