| 1 |
// This file is part of libptytty. Do not make local modifications. |
| 2 |
// http://software.schmorp.de/pkg/libptytty |
| 3 |
|
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/*----------------------------------------------------------------------* |
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* File: logging.C |
| 6 |
*----------------------------------------------------------------------* |
| 7 |
* |
| 8 |
* All portions of code are copyright by their respective author/s. |
| 9 |
* Copyright (c) 1992 John Bovey <jdb@ukc.ac.uk> |
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* - original version |
| 11 |
* Copyright (c) 1993 lipka |
| 12 |
* Copyright (c) 1993 Brian Stempien <stempien@cs.wmich.edu> |
| 13 |
* Copyright (c) 1995 Raul Garcia Garcia <rgg@tid.es> |
| 14 |
* Copyright (c) 1995 Piet W. Plomp <piet@idefix.icce.rug.nl> |
| 15 |
* 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 <pcg@goof.com> |
| 21 |
* 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 |
| 26 |
* (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 |
| 30 |
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 31 |
* 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 |
| 35 |
* 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 <cstdio> |
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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 <sys/fcntl.h> |
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#include <unistd.h> |
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#include <time.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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#if HAVE_STRUCT_UTMP |
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static int write_bsd_utmp (int utmp_pos, struct utmp *wu); |
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static void update_wtmp (const char *fname, const struct utmp *putmp); |
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#endif |
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|
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static void update_lastlog (const char *fname, const char *pty, const char *host); |
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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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/* |
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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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#ifdef HAVE_STRUCT_UTMP |
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struct utmp *ut = &this->ut; |
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#endif |
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#ifdef HAVE_STRUCT_UTMPX |
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struct utmpx *utx = &this->utx; |
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#endif |
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int i; |
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struct passwd *pwent = getpwuid (getuid ()); |
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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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#if defined(HAVE_UTMP_PID) || defined(HAVE_STRUCT_UTMPX) |
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if (!strncmp (pty, "pty", 3) || !strncmp (pty, "tty", 3)) |
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strncpy (ut_id, pty + 3, sizeof (ut_id)); |
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else if (sscanf (pty, "pts/%d", &i) == 1) |
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sprintf (ut_id, "vt%02x", (i & 0xff)); /* sysv naming */ |
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else if (strncmp (pty, "pty", 3) && strncmp (pty, "tty", 3)) |
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{ |
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ptytty_warn ("can't parse tty name \"%s\", not adding utmp entry.\n", pty); |
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return; |
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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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memset (ut, 0, sizeof (struct utmp)); |
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# ifdef HAVE_UTMP_PID |
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setutent (); |
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strncpy (ut->ut_id, ut_id, sizeof (ut->ut_id)); |
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ut->ut_type = DEAD_PROCESS; |
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getutid (ut); /* position to entry in utmp file */ |
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strncpy (this->ut_id, ut_id, sizeof (this->ut_id)); |
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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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memset (utx, 0, sizeof (struct utmpx)); |
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setutxent (); |
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strncpy (utx->ut_id, ut_id, sizeof (utx->ut_id)); |
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utx->ut_type = DEAD_PROCESS; |
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getutxid (utx); /* position to entry in utmp file */ |
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strncpy (this->ut_id, ut_id, sizeof (this->ut_id)); |
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#endif |
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|
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#ifdef HAVE_STRUCT_UTMP |
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strncpy (ut->ut_line, pty, sizeof (ut->ut_line)); |
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ut->ut_time = time (NULL); |
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# ifdef HAVE_UTMP_PID |
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strncpy (ut->ut_user, (pwent && pwent->pw_name) ? pwent->pw_name : "?", |
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sizeof (ut->ut_user)); |
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strncpy (ut->ut_id, ut_id, sizeof (ut->ut_id)); |
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ut->ut_time = time (NULL); |
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ut->ut_pid = cmd_pid; |
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# ifdef HAVE_UTMP_HOST |
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strncpy (ut->ut_host, hostname, sizeof (ut->ut_host)); |
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# endif |
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ut->ut_type = USER_PROCESS; |
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pututline (ut); |
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endutent (); /* close the file */ |
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utmp_pos = 0; |
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# else |
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strncpy (ut->ut_name, (pwent && pwent->pw_name) ? pwent->pw_name : "?", |
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sizeof (ut->ut_name)); |
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# ifdef HAVE_UTMP_HOST |
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strncpy (ut->ut_host, hostname, sizeof (ut->ut_host)); |
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# endif |
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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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strncpy (utx->ut_line, pty, sizeof (utx->ut_line)); |
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strncpy (utx->ut_user, (pwent && pwent->pw_name) ? pwent->pw_name : "?", |
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sizeof (utx->ut_user)); |
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strncpy (utx->ut_id, ut_id, sizeof (utx->ut_id)); |
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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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utx->ut_tv.tv_sec = time (NULL); |
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utx->ut_tv.tv_usec = 0; |
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utx->ut_pid = cmd_pid; |
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# ifdef HAVE_UTMPX_HOST |
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strncpy (utx->ut_host, hostname, sizeof (utx->ut_host)); |
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# if 0 |
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{ |
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char *colon; |
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|
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if ((colon = strrchr (ut->ut_host, ':')) != NULL) |
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*colon = '\0'; |
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} |
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# endif |
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# endif |
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utx->ut_type = USER_PROCESS; |
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pututxline (utx); |
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endutxent (); /* close the file */ |
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utmp_pos = 0; |
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#endif |
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|
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#if defined(HAVE_STRUCT_UTMP) && !defined(HAVE_UTMP_PID) |
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{ |
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# ifdef HAVE_TTYSLOT |
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int fdstdin = dup (STDIN_FILENO); |
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dup2 (tty, STDIN_FILENO); |
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|
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i = ttyslot (); |
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if (write_bsd_utmp (i, ut)) |
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utmp_pos = i; |
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|
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dup2 (fdstdin, STDIN_FILENO); |
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close (fdstdin); |
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# else |
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FILE *fd0; |
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|
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if ((fd0 = fopen (TTYTAB_FILENAME, "r")) != NULL) |
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{ |
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char buf[256], name[256]; |
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|
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buf[sizeof (buf) - 1] = '\0'; |
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for (i = 1; (fgets (buf, sizeof (buf) - 1, fd0) != NULL);) |
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{ |
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if (*buf == '#' || sscanf (buf, "%s", name) != 1) |
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continue; |
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if (!strcmp (ut->ut_line, name)) |
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{ |
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if (!write_bsd_utmp (i, ut)) |
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i = 0; |
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utmp_pos = i; |
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fclose (fd0); |
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break; |
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} |
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i++; |
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} |
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fclose (fd0); |
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} |
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# endif |
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} |
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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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#if defined(LASTLOG_SUPPORT) && defined(LASTLOG_FILE) |
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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 (LASTLOG_FILE, 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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#ifdef HAVE_STRUCT_UTMP |
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struct utmp *tmput, *ut = &this->ut; |
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#endif |
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#ifdef HAVE_STRUCT_UTMPX |
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struct utmpx *tmputx, *utx = &this->utx; |
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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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memset (ut, 0, sizeof (struct utmp)); |
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setutent (); |
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strncpy (ut->ut_id, this->ut_id, sizeof (ut->ut_id)); |
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ut->ut_type = USER_PROCESS; |
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if ((tmput = getutid (ut))) /* position to entry in utmp file */ |
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ut = tmput; |
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ut->ut_type = DEAD_PROCESS; |
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# else |
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memset (ut->ut_name, 0, sizeof (ut->ut_name)); |
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# ifdef HAVE_UTMP_HOST |
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memset (ut->ut_host, 0, sizeof (ut->ut_host)); |
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# endif |
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# endif |
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ut->ut_time = time (NULL); |
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#endif |
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|
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#ifdef HAVE_STRUCT_UTMPX |
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memset (utx, 0, sizeof (struct utmpx)); |
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setutxent (); |
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strncpy (utx->ut_id, this->ut_id, sizeof (utx->ut_id)); |
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utx->ut_type = USER_PROCESS; |
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if ((tmputx = getutxid (utx))) /* position to entry in utmp file */ |
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utx = tmputx; |
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utx->ut_type = DEAD_PROCESS; |
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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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utx->ut_tv.tv_sec = time (NULL); |
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utx->ut_tv.tv_usec = 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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if (ut->ut_pid == cmd_pid) |
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pututline (ut); |
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endutent (); |
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# else |
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memset (ut, 0, sizeof (struct utmp)); |
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write_bsd_utmp (utmp_pos, ut); |
| 326 |
# endif |
| 327 |
#endif |
| 328 |
#ifdef HAVE_STRUCT_UTMPX |
| 329 |
if (utx->ut_pid == cmd_pid) |
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pututxline (utx); |
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endutxent (); |
| 332 |
#endif |
| 333 |
|
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cmd_pid = 0; |
| 335 |
} |
| 336 |
|
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/* ------------------------------------------------------------------------- */ |
| 338 |
/* |
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* Write a BSD style utmp entry |
| 340 |
*/ |
| 341 |
#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 *wu) |
| 344 |
{ |
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int fd; |
| 346 |
|
| 347 |
if (utmp_pos <= 0 || (fd = open (UTMP_FILE, O_WRONLY)) == -1) |
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return 0; |
| 349 |
|
| 350 |
if (lseek (fd, (off_t) (utmp_pos * sizeof (struct utmp)), SEEK_SET) != -1) |
| 351 |
write (fd, wu, sizeof (struct utmp)); |
| 352 |
close (fd); |
| 353 |
return 1; |
| 354 |
} |
| 355 |
#endif |
| 356 |
|
| 357 |
/* ------------------------------------------------------------------------- */ |
| 358 |
/* |
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* Update a BSD style wtmp entry |
| 360 |
*/ |
| 361 |
#if defined(WTMP_SUPPORT) && !defined(HAVE_UPDWTMP) && defined(HAVE_STRUCT_UTMP) |
| 362 |
static void |
| 363 |
update_wtmp (const char *fname, const struct utmp *putmp) |
| 364 |
{ |
| 365 |
int fd, gotlock, retry; |
| 366 |
struct flock lck; /* fcntl locking scheme */ |
| 367 |
struct stat sbuf; |
| 368 |
|
| 369 |
if ((fd = open (fname, O_WRONLY | O_APPEND, 0)) < 0) |
| 370 |
return; |
| 371 |
|
| 372 |
lck.l_whence = SEEK_END; /* start lock at current eof */ |
| 373 |
lck.l_len = 0; /* end at ``largest possible eof'' */ |
| 374 |
lck.l_start = 0; |
| 375 |
lck.l_type = F_WRLCK; /* we want a write lock */ |
| 376 |
|
| 377 |
/* attempt lock with F_SETLK; F_SETLKW would cause a deadlock! */ |
| 378 |
for (retry = 10, gotlock = 0; retry--;) |
| 379 |
if (fcntl (fd, F_SETLK, &lck) != -1) |
| 380 |
{ |
| 381 |
gotlock = 1; |
| 382 |
break; |
| 383 |
} |
| 384 |
else if (errno != EAGAIN && errno != EACCES) |
| 385 |
break; |
| 386 |
if (!gotlock) |
| 387 |
{ /* give it up */ |
| 388 |
close (fd); |
| 389 |
return; |
| 390 |
} |
| 391 |
if (fstat (fd, &sbuf) == 0) |
| 392 |
if (write (fd, putmp, sizeof (struct utmp)) != sizeof (struct utmp)) |
| 393 |
ftruncate (fd, sbuf.st_size); /* remove bad writes */ |
| 394 |
|
| 395 |
lck.l_type = F_UNLCK; /* unlocking the file */ |
| 396 |
fcntl (fd, F_SETLK, &lck); |
| 397 |
close (fd); |
| 398 |
} |
| 399 |
#endif |
| 400 |
|
| 401 |
/* ------------------------------------------------------------------------- */ |
| 402 |
#ifdef LASTLOG_SUPPORT |
| 403 |
static void |
| 404 |
update_lastlog (const char *fname, const char *pty, const char *host) |
| 405 |
{ |
| 406 |
# ifdef HAVE_STRUCT_LASTLOGX |
| 407 |
struct lastlogx llx; |
| 408 |
# endif |
| 409 |
# ifdef HAVE_STRUCT_LASTLOG |
| 410 |
int fd; |
| 411 |
struct lastlog ll; |
| 412 |
# ifdef LASTLOG_IS_DIR |
| 413 |
char lastlogfile[256]; |
| 414 |
# endif |
| 415 |
struct passwd *pwent; |
| 416 |
# endif |
| 417 |
|
| 418 |
# ifdef HAVE_STRUCT_LASTLOGX |
| 419 |
memset (&llx, 0, sizeof (llx)); |
| 420 |
llx.ll_tv.tv_sec = time (NULL); |
| 421 |
llx.ll_tv.tv_usec = 0; |
| 422 |
strncpy (llx.ll_line, pty, sizeof (llx.ll_line)); |
| 423 |
strncpy (llx.ll_host, host, sizeof (llx.ll_host)); |
| 424 |
updlastlogx (LASTLOGX_FILE, getuid (), &llx); |
| 425 |
# endif |
| 426 |
|
| 427 |
# ifdef HAVE_STRUCT_LASTLOG |
| 428 |
pwent = getpwuid (getuid ()); |
| 429 |
if (!pwent) |
| 430 |
{ |
| 431 |
ptytty_warn ("no entry in password file, not updating lastlog.\n"); |
| 432 |
return; |
| 433 |
} |
| 434 |
|
| 435 |
memset (&ll, 0, sizeof (ll)); |
| 436 |
ll.ll_time = time (NULL); |
| 437 |
strncpy (ll.ll_line, pty, sizeof (ll.ll_line)); |
| 438 |
strncpy (ll.ll_host, host, sizeof (ll.ll_host)); |
| 439 |
# ifdef LASTLOG_IS_DIR |
| 440 |
sprintf (lastlogfile, "%.*s/%.*s", |
| 441 |
sizeof (lastlogfile) - sizeof (pwent->pw_name) - 2, fname, |
| 442 |
sizeof (pwent->pw_name), |
| 443 |
(!pwent->pw_name || pwent->pw_name[0] == '\0') ? "unknown" |
| 444 |
: pwent->pw_name); |
| 445 |
if ((fd = open (lastlogfile, O_WRONLY | O_CREAT, 0644)) >= 0) |
| 446 |
{ |
| 447 |
write (fd, &ll, sizeof (ll)); |
| 448 |
close (fd); |
| 449 |
} |
| 450 |
# else |
| 451 |
if ((fd = open (fname, O_RDWR)) != -1) |
| 452 |
{ |
| 453 |
if (lseek (fd, (off_t) ((long)pwent->pw_uid * sizeof (ll)), |
| 454 |
SEEK_SET) != -1) |
| 455 |
write (fd, &ll, sizeof (ll)); |
| 456 |
close (fd); |
| 457 |
} |
| 458 |
# endif /* LASTLOG_IS_DIR */ |
| 459 |
# endif /* HAVE_STRUCT_LASTLOG */ |
| 460 |
} |
| 461 |
#endif /* LASTLOG_SUPPORT */ |
| 462 |
|
| 463 |
#else |
| 464 |
void |
| 465 |
ptytty_unix::login (int cmd_pid, bool login_shell, const char *hostname) |
| 466 |
{ |
| 467 |
} |
| 468 |
#endif |
| 469 |
|
