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// This file is part of libptytty. Do not make local modifications. |
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// http://software.schmorp.de/pkg/libptytty |
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|
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/*----------------------------------------------------------------------* |
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* File: logging.C |
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*----------------------------------------------------------------------* |
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* |
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* All portions of code are copyright by their respective author/s. |
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* Copyright (c) 1992 John Bovey <jdb@ukc.ac.uk> |
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* - original version |
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* Copyright (c) 1993 lipka |
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* Copyright (c) 1993 Brian Stempien <stempien@cs.wmich.edu> |
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* Copyright (c) 1995 Raul Garcia Garcia <rgg@tid.es> |
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* Copyright (c) 1995 Piet W. Plomp <piet@idefix.icce.rug.nl> |
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* Copyright (c) 1997 Raul Garcia Garcia <rgg@tid.es> |
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* Copyright (c) 1998-2001 Geoff Wing <gcw@pobox.com> |
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* - extensive modifications |
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* Copyright (c) 1999 D J Hawkey Jr <hawkeyd@visi.com> |
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* - lastlog support |
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* Copyright (c) 2004-2006 Marc Lehmann <schmorp@schmorp.de> |
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* Copyright (c) 2006 Emanuele Giaquinta <e.giaquinta@glauco.it> |
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* |
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* This program is free software; you can redistribute it and/or modify |
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* it under the terms of the GNU General Public License as published by |
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* the Free Software Foundation; either version 2 of the License, or |
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* (at your option) any later version. |
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* |
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* This program is distributed in the hope that it will be useful, |
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* but WITHOUT ANY WARRANTY; without even the implied warranty of |
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
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* GNU General Public License for more details. |
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* |
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* You should have received a copy of the GNU General Public License |
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* along with this program; if not, write to the Free Software |
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* Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. |
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*----------------------------------------------------------------------*/ |
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|
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#include "config.h" |
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|
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#include "ptytty.h" |
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|
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#if UTMP_SUPPORT |
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|
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#include <cstdio> |
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#include <cstring> |
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|
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#include <sys/types.h> |
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#include <sys/stat.h> |
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#include <fcntl.h> |
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#include <unistd.h> |
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#include <time.h> |
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#include <errno.h> |
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|
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/* |
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* BSD style utmp entry |
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* ut_line, ut_name, ut_host, ut_time |
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* SYSV style utmp (and utmpx) entry |
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* ut_user, ut_id, ut_line, ut_pid, ut_type, ut_exit, ut_time |
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*/ |
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|
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/* ------------------------------------------------------------------------- */ |
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/* |
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* Write a BSD style utmp entry |
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*/ |
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#if defined(HAVE_STRUCT_UTMP) && !defined(HAVE_UTMP_PID) |
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static int |
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write_bsd_utmp (int utmp_pos, struct utmp *ut) |
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{ |
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int fd; |
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|
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if (utmp_pos <= 0 || (fd = open (UTMP_FILE, O_WRONLY)) == -1) |
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return 0; |
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|
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if (lseek (fd, (off_t) (utmp_pos * sizeof (struct utmp)), SEEK_SET) != -1) |
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write (fd, ut, sizeof (struct utmp)); |
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close (fd); |
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return 1; |
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} |
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#endif |
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|
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/* ------------------------------------------------------------------------- */ |
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/* |
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* Update a BSD style wtmp entry |
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*/ |
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#if defined(WTMP_SUPPORT) && !defined(HAVE_UPDWTMP) && defined(HAVE_STRUCT_UTMP) |
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static void |
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update_wtmp (const char *fname, const struct utmp *ut) |
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{ |
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int fd, gotlock, retry; |
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struct flock lck; /* fcntl locking scheme */ |
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struct stat sbuf; |
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|
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if ((fd = open (fname, O_WRONLY | O_APPEND, 0)) < 0) |
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return; |
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|
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lck.l_whence = SEEK_END; /* start lock at current eof */ |
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lck.l_len = 0; /* end at ``largest possible eof'' */ |
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lck.l_start = 0; |
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lck.l_type = F_WRLCK; /* we want a write lock */ |
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|
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/* attempt lock with F_SETLK; F_SETLKW would cause a deadlock! */ |
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for (retry = 10, gotlock = 0; retry--;) |
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if (fcntl (fd, F_SETLK, &lck) != -1) |
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{ |
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gotlock = 1; |
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break; |
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} |
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else if (errno != EAGAIN && errno != EACCES) |
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break; |
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if (!gotlock) |
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{ |
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/* give it up */ |
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close (fd); |
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return; |
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} |
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if (fstat (fd, &sbuf) == 0) |
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if (write (fd, ut, sizeof (struct utmp)) != sizeof (struct utmp)) |
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ftruncate (fd, sbuf.st_size); /* remove bad writes */ |
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|
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lck.l_type = F_UNLCK; /* unlocking the file */ |
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fcntl (fd, F_SETLK, &lck); |
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close (fd); |
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} |
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#endif |
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|
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/* ------------------------------------------------------------------------- */ |
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#ifdef LASTLOG_SUPPORT |
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static void |
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update_lastlog (const char *pty, const char *host) |
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{ |
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# if defined(HAVE_STRUCT_LASTLOGX) && defined(HAVE_UPDLASTLOGX) |
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struct lastlogx llx; |
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# endif |
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# ifdef HAVE_STRUCT_LASTLOG |
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int fd; |
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struct lastlog ll; |
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struct passwd *pwent; |
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# endif |
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|
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# if defined(HAVE_STRUCT_LASTLOGX) && defined(HAVE_UPDLASTLOGX) |
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memset (&llx, 0, sizeof (llx)); |
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llx.ll_tv.tv_sec = time (NULL); |
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llx.ll_tv.tv_usec = 0; |
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strncpy (llx.ll_line, pty, sizeof (llx.ll_line)); |
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strncpy (llx.ll_host, host, sizeof (llx.ll_host)); |
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updlastlogx (LASTLOGX_FILE, getuid (), &llx); |
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# endif |
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|
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# ifdef HAVE_STRUCT_LASTLOG |
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pwent = getpwuid (getuid ()); |
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if (!pwent) |
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{ |
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PTYTTY_WARN ("no entry in password file, not updating lastlog.\n", 0); |
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return; |
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} |
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|
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memset (&ll, 0, sizeof (ll)); |
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ll.ll_time = time (NULL); |
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strncpy (ll.ll_line, pty, sizeof (ll.ll_line)); |
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strncpy (ll.ll_host, host, sizeof (ll.ll_host)); |
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if ((fd = open (LASTLOG_FILE, O_RDWR)) != -1) |
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{ |
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if (lseek (fd, (off_t) ((long)pwent->pw_uid * sizeof (ll)), |
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SEEK_SET) != -1) |
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write (fd, &ll, sizeof (ll)); |
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close (fd); |
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} |
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# endif /* HAVE_STRUCT_LASTLOG */ |
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} |
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#endif /* LASTLOG_SUPPORT */ |
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|
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#if defined(HAVE_UTMP_PID) || defined(HAVE_STRUCT_UTMPX) |
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static void |
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fill_id (char *id, const char *line, size_t id_size) |
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{ |
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size_t len = strlen (line); |
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|
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if (len > id_size) |
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line += len - id_size; |
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strncpy (id, line, id_size); |
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} |
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#endif |
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|
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#ifdef HAVE_STRUCT_UTMP |
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static void |
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fill_utmp (struct utmp *ut, bool login, int pid, const char *line, const char *user, const char *host) |
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{ |
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memset (ut, 0, sizeof (struct utmp)); |
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|
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strncpy (ut->ut_line, line, sizeof (ut->ut_line)); |
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# ifdef HAVE_UTMP_PID |
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fill_id (ut->ut_id, line, sizeof (ut->ut_id)); |
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ut->ut_pid = pid; |
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ut->ut_type = login ? USER_PROCESS : DEAD_PROCESS; |
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# endif |
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ut->ut_time = time (NULL); |
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|
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if (login) |
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{ |
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# ifdef HAVE_UTMP_PID |
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strncpy (ut->ut_user, user, sizeof (ut->ut_user)); |
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# else |
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strncpy (ut->ut_name, user, sizeof (ut->ut_name)); |
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# endif |
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# ifdef HAVE_UTMP_HOST |
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strncpy (ut->ut_host, host, sizeof (ut->ut_host)); |
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# endif |
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} |
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} |
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#endif |
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|
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#ifdef HAVE_STRUCT_UTMPX |
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static void |
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fill_utmpx (struct utmpx *utx, bool login, int pid, const char *line, const char *user, const char *host) |
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{ |
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memset (utx, 0, sizeof (struct utmpx)); |
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|
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// posix says that ut_line is not meaningful for DEAD_PROCESS |
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// records, but most implementations of last use ut_line to |
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// associate records in wtmp file |
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strncpy (utx->ut_line, line, sizeof (utx->ut_line)); |
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fill_id (utx->ut_id, line, sizeof (utx->ut_id)); |
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utx->ut_pid = pid; |
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utx->ut_type = login ? USER_PROCESS : DEAD_PROCESS; |
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utx->ut_tv.tv_sec = time (NULL); |
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utx->ut_tv.tv_usec = 0; |
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# if HAVE_UTMPX_SESSION |
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utx->ut_session = getsid (0); |
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# endif |
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|
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// posix says that ut_user is not meaningful for DEAD_PROCESS |
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// records, but solaris utmp_update helper requires that the ut_user |
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// field of a DEAD_PROCESS entry matches the one of an existing |
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// USER_PROCESS entry for the same line, if any |
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strncpy (utx->ut_user, user, sizeof (utx->ut_user)); |
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|
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if (login) |
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{ |
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# ifdef HAVE_UTMPX_HOST |
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strncpy (utx->ut_host, host, sizeof (utx->ut_host)); |
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# endif |
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} |
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} |
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#endif |
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|
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/* ------------------------------------------------------------------------- */ |
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|
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/* |
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* make and write utmp and wtmp entries |
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*/ |
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void |
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ptytty_unix::login (int cmd_pid, bool login_shell, const char *hostname) |
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{ |
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const char *pty = name; |
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|
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if (!pty || !*pty) |
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return; |
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|
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this->cmd_pid = cmd_pid; |
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this->login_shell = login_shell; |
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|
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struct passwd *pwent = getpwuid (getuid ()); |
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const char *user = (pwent && pwent->pw_name) ? pwent->pw_name : "?"; |
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|
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if (!strncmp (pty, "/dev/", 5)) |
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pty += 5; /* skip /dev/ prefix */ |
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|
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#ifdef HAVE_STRUCT_UTMP |
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struct utmp *ut = &this->ut; |
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fill_utmp (ut, true, cmd_pid, pty, user, hostname); |
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#endif |
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|
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#ifdef HAVE_STRUCT_UTMPX |
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struct utmpx *utx = &this->utx; |
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fill_utmpx (utx, true, cmd_pid, pty, user, hostname); |
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#endif |
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|
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#ifdef HAVE_STRUCT_UTMP |
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# ifdef HAVE_UTMP_PID |
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setutent (); |
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pututline (ut); |
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endutent (); |
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# else |
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int fd_stdin = dup (STDIN_FILENO); |
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dup2 (tty, STDIN_FILENO); |
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|
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utmp_pos = ttyslot (); |
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if (!write_bsd_utmp (utmp_pos, ut)) |
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utmp_pos = 0; |
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|
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dup2 (fd_stdin, STDIN_FILENO); |
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close (fd_stdin); |
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# endif |
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#endif |
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|
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#ifdef HAVE_STRUCT_UTMPX |
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setutxent (); |
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pututxline (utx); |
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endutxent (); |
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#endif |
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|
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#ifdef WTMP_SUPPORT |
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#ifdef LOG_ONLY_ON_LOGIN |
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if (login_shell) |
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#endif |
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{ |
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# ifdef HAVE_STRUCT_UTMP |
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# ifdef HAVE_UPDWTMP |
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updwtmp (WTMP_FILE, ut); |
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# else |
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update_wtmp (WTMP_FILE, ut); |
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# endif |
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# endif |
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# if defined(HAVE_STRUCT_UTMPX) && defined(HAVE_UPDWTMPX) |
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updwtmpx (WTMPX_FILE, utx); |
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# endif |
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} |
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#endif |
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#ifdef LASTLOG_SUPPORT |
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#ifdef LOG_ONLY_ON_LOGIN |
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if (login_shell) |
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#endif |
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update_lastlog (pty, hostname); |
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#endif |
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} |
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|
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/* ------------------------------------------------------------------------- */ |
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/* |
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* remove utmp and wtmp entries |
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*/ |
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void |
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ptytty_unix::logout () |
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{ |
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if (!cmd_pid) |
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return; |
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|
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const char *pty = name; |
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|
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if (!strncmp (pty, "/dev/", 5)) |
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pty += 5; |
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|
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#ifdef HAVE_STRUCT_UTMP |
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struct utmp *tmput, *ut = &this->ut; |
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fill_utmp (ut, false, cmd_pid, pty, 0, 0); |
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#endif |
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|
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#ifdef HAVE_STRUCT_UTMPX |
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struct utmpx *tmputx, *utx = &this->utx; |
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fill_utmpx (utx, false, cmd_pid, pty, 0, 0); |
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#endif |
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|
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/* |
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* Write ending wtmp entry |
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*/ |
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#ifdef WTMP_SUPPORT |
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#ifdef LOG_ONLY_ON_LOGIN |
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if (login_shell) |
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#endif |
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{ |
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# ifdef HAVE_STRUCT_UTMP |
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# ifdef HAVE_UPDWTMP |
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updwtmp (WTMP_FILE, ut); |
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# else |
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update_wtmp (WTMP_FILE, ut); |
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# endif |
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# endif |
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# if defined(HAVE_STRUCT_UTMPX) && defined(HAVE_UPDWTMPX) |
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updwtmpx (WTMPX_FILE, utx); |
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# endif |
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} |
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#endif |
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|
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/* |
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* Write utmp entry |
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*/ |
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#ifdef HAVE_STRUCT_UTMP |
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# ifdef HAVE_UTMP_PID |
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setutent (); |
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tmput = getutid (ut); |
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if (tmput && tmput->ut_pid == cmd_pid) |
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pututline (ut); |
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endutent (); |
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# else |
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write_bsd_utmp (utmp_pos, ut); |
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# endif |
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#endif |
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#ifdef HAVE_STRUCT_UTMPX |
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setutxent (); |
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tmputx = getutxid (utx); |
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if (tmputx && tmputx->ut_pid == cmd_pid) |
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pututxline (utx); |
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endutxent (); |
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#endif |
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|
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cmd_pid = 0; |
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} |
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|
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#else |
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void |
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ptytty_unix::login (int cmd_pid, bool login_shell, const char *hostname) |
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{ |
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} |
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#endif |
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|
