/* 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 = (char*)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 = (char*)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 }