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-rw-r--r--tdm/backend/sessreg.c307
1 files changed, 307 insertions, 0 deletions
diff --git a/tdm/backend/sessreg.c b/tdm/backend/sessreg.c
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--- /dev/null
+++ b/tdm/backend/sessreg.c
@@ -0,0 +1,307 @@
+/*
+
+Copyright 1990, 1998 The Open Group
+Copyright 2005 Oswald Buddenhagen <ossi@kde.org>
+
+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 <stolcke@icsi.berkeley.edu>
+
+*/
+
+#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 )
+{
+ 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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