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/*
Copyright 1990, 1998 The Open Group
Copyright 2005 Oswald Buddenhagen <[email protected]>
Permission to use, copy, modify, distribute, and sell this software and its
documentation for any purpose is hereby granted without fee, provided that
the above copyright notice appear in all copies and that both that
copyright notice and this permission notice appear in supporting
documentation.
The above copyright notice and this permission notice shall be included
in all copies or substantial portions of the Software.
THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
IN NO EVENT SHALL THE OPEN GROUP BE LIABLE FOR ANY CLAIM, DAMAGES OR
OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
OTHER DEALINGS IN THE SOFTWARE.
Except as contained in this notice, the name of The Open Group shall
not be used in advertising or otherwise to promote the sale, use or
other dealings in this Software without prior written authorization
from The Open Group.
*/
/*
Author: Keith Packard, MIT X Consortium
Lastlog support and dynamic utmp entry allocation
by Andreas Stolcke <[email protected]>
*/
#define _FILE_OFFSET_BITS 64
#include "dm.h"
#include "dm_error.h"
#if defined(__svr4__) || defined(__Lynx__) || defined(__QNX__) || defined(__APPLE__) || defined(_SEQUENT_) /*|| defined(USE_PAM)*/
# define NO_LASTLOG
#endif
#ifndef NO_LASTLOG
# ifdef HAVE_LASTLOG_H
# include <lastlog.h>
# endif
# ifndef LLOG_FILE
# ifdef _PATH_LASTLOGX
# define LLOG_FILE _PATH_LASTLOGX
# elif defined(_PATH_LASTLOG)
# define LLOG_FILE _PATH_LASTLOG
# else
# define LLOG_FILE "/usr/adm/lastlog"
# endif
# endif
#endif
#if !defined(__svr4__) && !defined(__QNX__)
# define SESSREG_HOST
#endif
#ifdef BSD
# if !defined(__FreeBSD__) && !defined(__OpenBSD__) && !defined(__NetBSD__)
/* *BSD doesn't like a ':0' type entry in utmp */
# define NO_UTMP
# endif
#endif
#ifdef BSD_UTMP
# ifndef TTYS_FILE
# define TTYS_FILE "/etc/ttys"
# endif
#endif
#ifdef _AIX
# define UTL_PFX "xdm/"
# define UTL_OFF strlen(UTL_PFX)
#else
# define UTL_OFF 0
#endif
#ifndef BSD_UTMP
static unsigned
crc32s( const unsigned char *str )
{
int b;
unsigned crc = 0xffffffff, by;
for (; *str; str++) {
by = (crc & 255) ^ *str;
for (b = 0; b < 8; b++)
by = (by >> 1) ^ (-(by & 1) & 0xedb88320);
crc = (crc >> 8) ^ by;
}
return crc;
}
#endif
void
sessreg( struct display *d, int pid, const char *user, int uid )
{
const char *dot, *colon;
int left, clen;
#ifdef BSD_UTMP
FILE *ttys;
int utmp, slot, freeslot;
STRUCTUTMP entry;
#else
unsigned crc, i;
#endif
int wtmp, c;
#ifndef NO_LASTLOG
int llog;
struct LASTLOG ll;
#endif
STRUCTUTMP ut_ent;
if (!d->useSessReg)
return;
bzero( &ut_ent, sizeof(ut_ent) );
if (pid) {
strncpy( ut_ent.ut_user, user, sizeof(ut_ent.ut_user) );
#ifndef BSD_UTMP
ut_ent.ut_pid = pid;
ut_ent.ut_type = USER_PROCESS;
} else {
ut_ent.ut_type = DEAD_PROCESS;
#endif
}
ut_ent.ut_time = time( 0 );
colon = strchr( d->name, ':' );
clen = strlen( colon );
if (clen > (int)(sizeof(ut_ent.ut_line) - UTL_OFF) - 2)
return; /* uhm, well ... */
if (colon == d->name) {
#ifndef BSD_UTMP
strncpy( ut_ent.ut_id, d->name, sizeof(ut_ent.ut_id) );
#endif
left = 0;
} else {
#ifdef SESSREG_HOST
# ifndef BSD_UTMP
if (pid)
# endif
{
if (colon - d->name > (int)sizeof(ut_ent.ut_host)) {
ut_ent.ut_host[0] = '~';
memcpy( ut_ent.ut_host + 1,
colon - (sizeof(ut_ent.ut_host) - 1),
sizeof(ut_ent.ut_host) - 1 );
} else
memcpy( ut_ent.ut_host, d->name, colon - d->name );
}
#endif
#ifndef BSD_UTMP
crc = crc32s( d->name );
ut_ent.ut_id[0] = crc % 26 + 'A';
crc /= 26;
for (i = 1; i < sizeof(ut_ent.ut_id); i++) {
c = crc % 62;
crc /= 62;
ut_ent.ut_id[i] = c < 26 ? c + 'A' :
c < 52 ? c - 26 + 'a' : c - 52 + '0';
}
#endif
left = sizeof(ut_ent.ut_line) - UTL_OFF - clen;
if (colon - d->name <= left) {
clen += colon - d->name;
colon = d->name;
left = 0;
} else {
dot = strchr( d->name, '.' );
if (dot && dot - d->name < left) {
memcpy( ut_ent.ut_line + UTL_OFF, d->name, left - 1 );
ut_ent.ut_line[UTL_OFF + left - 1] = '~';
} else {
memcpy( ut_ent.ut_line + UTL_OFF, d->name, left/2 - 1 );
ut_ent.ut_line[UTL_OFF + left/2 - 1] = '~';
if (dot) {
memcpy( ut_ent.ut_line + UTL_OFF + left/2,
dot - (left - left/2 - 1),
left - left/2 - 1 );
ut_ent.ut_line[UTL_OFF + left - 1] = '~';
} else
memcpy( ut_ent.ut_line + UTL_OFF + left/2,
colon - (left - left/2), left - left/2 );
}
}
}
#ifdef UTL_PFX
memcpy( ut_ent.ut_line, UTL_PFX, UTL_OFF );
#endif
memcpy( ut_ent.ut_line + UTL_OFF + left, colon, clen );
#ifndef NO_UTMP
# ifdef BSD_UTMP
if ((utmp = open( UTMP_FILE, O_RDWR )) < 0)
Debug( "cannot open utmp file " UTMP_FILE ": %m\n" );
else {
slot = 1;
if (pid) {
if (!(ttys = fopen( TTYS_FILE, "r" )))
LogWarn( "Cannot open tty file " TTYS_FILE ": %m\n" );
else {
int column0 = 1;
while ((c = getc( ttys )) != EOF)
if (c == '\n') {
slot++;
column0 = 1;
} else
column0 = 0;
if (!column0)
slot++;
fclose( ttys );
}
}
freeslot = -1;
lseek( utmp, slot * sizeof(entry), SEEK_SET );
while (read( utmp, (char *)&entry, sizeof(entry) ) == sizeof(entry)) {
if (!strncmp( entry.ut_line, ut_ent.ut_line,
sizeof(entry.ut_line) ))
# ifdef SESSREG_HOST
if (!strncmp( entry.ut_host, ut_ent.ut_host,
sizeof(entry.ut_host) ))
# endif
goto found;
if (freeslot < 0 && *entry.ut_user == '\0')
freeslot = slot;
slot++;
}
if (!pid) {
Debug( "utmp entry for display %s vanished\n", d->name );
goto skip;
}
if (freeslot >= 0)
slot = freeslot;
found:
# ifdef SESSREG_HOST
if (!pid)
bzero( ut_ent.ut_host, sizeof(ut_ent.ut_host) );
# endif
lseek( utmp, slot * sizeof(ut_ent), SEEK_SET );
if (write( utmp, (char *)&ut_ent, sizeof(ut_ent) ) != sizeof(ut_ent))
LogError( "Cannot write utmp file " UTMP_FILE ": %m\n" );
skip:
close( utmp );
}
# else
UTMPNAME( UTMP_FILE );
SETUTENT();
PUTUTLINE( &ut_ent );
ENDUTENT();
# endif
#endif
if ((wtmp = open( WTMP_FILE, O_WRONLY|O_APPEND )) < 0)
Debug( "cannot open wtmp file " WTMP_FILE ": %m\n" );
else {
if (write( wtmp, (char *)&ut_ent, sizeof(ut_ent) ) != sizeof(ut_ent))
LogError( "Cannot write wtmp file " WTMP_FILE ": %m\n" );
close( wtmp );
}
#ifndef NO_LASTLOG
if (pid) {
bzero( (char *)&ll, sizeof(ll) );
ll.ll_time = ut_ent.ut_time;
memcpy( ll.ll_line, ut_ent.ut_line, sizeof(ll.ll_line) );
memcpy( ll.ll_host, ut_ent.ut_host, sizeof(ll.ll_host) );
# ifdef HAVE_UTMPX
updlastlogx( LLOG_FILE, uid, &ll );
# else
if ((llog = open( LLOG_FILE, O_RDWR )) < 0)
Debug( "cannot open lastlog file " LLOG_FILE ": %m\n" );
else {
lseek( llog, (off_t)uid * sizeof(ll), SEEK_SET );
if (write( llog, (char *)&ll, sizeof(ll) ) != sizeof(ll))
LogError( "Cannot write llog file " WTMP_FILE ": %m\n" );
close( llog );
}
# endif
}
#else
(void)uid;
#endif
#ifdef UTL_PFX
{
char tmp[sizeof("/dev/") + sizeof(ut_ent.ut_line)];
mkdir( "/dev/" UTL_PFX, 0755 );
chmod( "/dev/" UTL_PFX, 0755 );
sprintf( tmp, "/dev/%.*s", sizeof(ut_ent.ut_line), ut_ent.ut_line );
if (pid)
close( creat( tmp, 0644 ) );
else
unlink( tmp );
}
#endif
}
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