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/*--------------------------------*-C-*---------------------------------*
* File: utmp.c
*----------------------------------------------------------------------*
* Copyright 1997,1998 Geoff Wing <gcw@pobox.com>
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
*----------------------------------------------------------------------*/
/*----------------------------------------------------------------------*
* Originally written:
* 1992 John Bovey <jdb@ukc.ac.uk>
* Modifications:
* 1993 lipka
* 1993 Brian Stempien <stempien@cs.wmich.edu>
* 1995 Raul Garcia Garcia <rgg@tid.es>
* 1995 Piet W. Plomp <piet@idefix.icce.rug.nl>
* 1997 Raul Garcia Garcia <rgg@tid.es>
* 1997,1998 Geoff Wing <mason@primenet.com.au>
*----------------------------------------------------------------------*/
/*----------------------------------------------------------------------*
* Public:
* extern void cleanutent (void);
* extern void makeutent (const char * pty, const char * hostname);
*
* Private:
* write_utmp ();
* update_wtmp ();
*----------------------------------------------------------------------*/
#ifndef lint
static const char rcsid[] = "$Id: utmp.c,v 1.1.1.1 2001/03/11 07:50:05 sashav Exp $";
#endif
#include "rxvt.h" /* NECESSARY */
/*
* HAVE_SETUTENT corresponds to SYSV-style utmp support.
* Without it corresponds to using BSD utmp support.
* SYSV-style utmp support is further divided in normal utmp support
* and utmpx support (Solaris 2.x) by HAVE_UTMPX_H
*/
/*
* update wtmp entries - only for SYSV style UTMP systems
*/
#ifdef UTMP_SUPPORT
static char ut_id[5]; /* remember if entry to utmp made */
# ifndef USE_SYSV_UTMP
static int utmp_pos; /* BSD position of utmp-stamp */
# endif
#endif
/* ------------------------------------------------------------------------- */
#ifndef HAVE_UTMPX_H /* supposedly we have updwtmpx ? */
#ifdef WTMP_SUPPORT
/* PROTO */
void
rxvt_update_wtmp(char *fname, struct utmp *putmp)
{
int fd, retry = 10; /* 10 attempts at locking */
struct flock lck; /* fcntl locking scheme */
if ((fd = open(fname, O_WRONLY | O_APPEND, 0)) < 0)
return;
lck.l_whence = SEEK_END; /* start lock at current eof */
lck.l_len = 0; /* end at ``largest possible eof'' */
lck.l_start = 0;
lck.l_type = F_WRLCK; /* we want a write lock */
while (retry--)
/* attempt lock with F_SETLK - F_SETLKW would cause a deadlock! */
if ((fcntl(fd, F_SETLK, &lck) < 0) && errno != EACCESS) {
close(fd);
return; /* failed for unknown reason: give up */
}
write(fd, putmp, sizeof(struct utmp));
/* unlocking the file */
lck.l_type = F_UNLCK;
fcntl(fd, F_SETLK, &lck);
close(fd);
}
#endif /* WTMP_SUPPORT */
#endif /* !HAVE_UTMPX_H */
/* ------------------------------------------------------------------------- */
#ifdef UTMP_SUPPORT
/*
* make a utmp entry
*/
/* PROTO */
void
makeutent(const char *pty, const char *hostname)
{
struct passwd *pwent = getpwuid(getuid());
UTMP utmp;
#ifndef USE_SYSV_UTMP
/*
* BSD style utmp entry
* ut_line, ut_name, ut_host, ut_time
*/
int i;
FILE *fd0, *fd1;
char buf[256], name[256];
#else
/*
* SYSV style utmp entry
* ut_user, ut_id, ut_line, ut_pid, ut_type, ut_exit, ut_time
*/
char *colon;
#endif /* !USE_SYSV_UTMP */
/* BSD naming is of the form /dev/tty?? or /dev/pty?? */
MEMSET(&utmp, 0, sizeof(UTMP));
if (!strncmp(pty, "/dev/", 5))
pty += 5; /* skip /dev/ prefix */
if (!strncmp(pty, "pty", 3) || !strncmp(pty, "tty", 3))
STRNCPY(ut_id, (pty + 3), sizeof(ut_id));
else
#ifndef USE_SYSV_UTMP
{
print_error("can't parse tty name \"%s\"", pty);
ut_id[0] = '\0'; /* entry not made */
return;
}
STRNCPY(utmp.ut_line, pty, sizeof(utmp.ut_line));
STRNCPY(utmp.ut_name, (pwent && pwent->pw_name) ? pwent->pw_name : "?",
sizeof(utmp.ut_name));
STRNCPY(utmp.ut_host, hostname, sizeof(utmp.ut_host));
utmp.ut_time = time(NULL);
if ((fd0 = fopen(UTMP_FILENAME, "r+")) == NULL)
ut_id[0] = '\0'; /* entry not made */
else {
utmp_pos = -1;
if ((fd1 = fopen(TTYTAB_FILENAME, "r")) != NULL) {
for (i = 1; (fgets(buf, sizeof(buf), fd1) != NULL); i++) {
if (*buf == '#' || sscanf(buf, "%s", name) != 1)
continue;
if (!strcmp(utmp.ut_line, name)) {
fclose(fd1);
utmp_pos = i * sizeof(struct utmp);
break;
}
}
fclose(fd1);
}
if (utmp_pos < 0)
ut_id[0] = '\0'; /* entry not made */
else {
fseek(fd0, utmp_pos, 0);
fwrite(&utmp, sizeof(UTMP), 1, fd0);
}
fclose(fd0);
}
#else /* USE_SYSV_UTMP */
{
int n;
if (sscanf(pty, "pts/%d", &n) == 1)
sprintf(ut_id, "vt%02x", (n % 256)); /* sysv naming */
else {
print_error("can't parse tty name \"%s\"", pty);
ut_id[0] = '\0'; /* entry not made */
return;
}
}
utmpname(UTMP_FILENAME);
setutent(); /* XXX: should be unnecessaray */
STRNCPY(utmp.ut_id, ut_id, sizeof(utmp.ut_id));
utmp.ut_type = DEAD_PROCESS;
(void)getutid(&utmp); /* position to entry in utmp file */
/* set up the new entry */
utmp.ut_type = USER_PROCESS;
#ifndef linux
utmp.ut_exit.e_exit = 2;
#endif
STRNCPY(utmp.ut_user, (pwent && pwent->pw_name) ? pwent->pw_name : "?",
sizeof(utmp.ut_user));
STRNCPY(utmp.ut_id, ut_id, sizeof(utmp.ut_id));
STRNCPY(utmp.ut_line, pty, sizeof(utmp.ut_line));
#ifdef HAVE_UTMP_HOST
STRNCPY(utmp.ut_host, hostname, sizeof(utmp.ut_host));
#ifndef linux
if ((colon = strrchr(utmp.ut_host, ':')) != NULL)
*colon = '\0';
#endif
#endif /* HAVE_UTMP_HOST */
/* ut_name is normally the same as ut_user, but .... */
STRNCPY(utmp.ut_name, (pwent && pwent->pw_name) ? pwent->pw_name : "?",
sizeof(utmp.ut_name));
utmp.ut_pid = getpid();
#ifdef HAVE_UTMPX_H
utmp.ut_session = getsid(0);
utmp.ut_tv.tv_sec = time(NULL);
utmp.ut_tv.tv_usec = 0;
#else
utmp.ut_time = time(NULL);
#endif /* HAVE_UTMPX_H */
pututline(&utmp);
#ifdef WTMP_SUPPORT
update_wtmp(WTMP_FILENAME, &utmp);
#endif
endutent(); /* close the file */
#endif /* !USE_SYSV_UTMP */
}
#endif /* UTMP_SUPPORT */
/* ------------------------------------------------------------------------- */
#ifdef UTMP_SUPPORT
/*
* remove a utmp entry
*/
/* PROTO */
void
cleanutent(void)
{
UTMP utmp;
#ifndef USE_SYSV_UTMP
FILE *fd;
if (ut_id[0] && ((fd = fopen(UTMP_FILENAME, "r+")) != NULL)) {
MEMSET(&utmp, 0, sizeof(struct utmp));
fseek(fd, utmp_pos, 0);
fwrite(&utmp, sizeof(struct utmp), 1, fd);
fclose(fd);
}
#else /* USE_SYSV_UTMP */
UTMP *putmp;
if (!ut_id[0])
return; /* entry not made */
utmpname(UTMP_FILENAME);
MEMSET(&utmp, 0, sizeof(UTMP));
STRNCPY(utmp.ut_id, ut_id, sizeof(utmp.ut_id));
utmp.ut_type = USER_PROCESS;
setutent(); /* XXX: should be unnecessaray */
putmp = getutid(&utmp);
if (!putmp || putmp->ut_pid != getpid())
return;
putmp->ut_type = DEAD_PROCESS;
#ifdef HAVE_UTMPX_H
putmp->ut_session = getsid(0);
putmp->ut_tv.tv_sec = time(NULL);
putmp->ut_tv.tv_usec = 0;
#else /* HAVE_UTMPX_H */
putmp->ut_time = time(NULL);
#endif /* HAVE_UTMPX_H */
pututline(putmp);
#ifdef WTMP_SUPPORT
update_wtmp(WTMP_FILENAME, putmp);
#endif
endutent();
#endif /* !USE_SYSV_UTMP */
}
#endif
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