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freebsd/libexec/telnetd/sys_term.c
Kris Kennaway 4147bd4426 Filter out some more magic environment variables used by libraries linked 
with telnetd. This should really be done with a positive filter - i.e.
only allow through a configured list of variables.

Also do some buffer-safety cleanups while I'm here - I don't think these
are exploitable.
2000-10-31 05:29:54 +00:00

2214 lines
46 KiB
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/*
* Copyright (c) 1989, 1993
* The Regents of the University of California. All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. All advertising materials mentioning features or use of this software
* must display the following acknowledgement:
* This product includes software developed by the University of
* California, Berkeley and its contributors.
* 4. Neither the name of the University nor the names of its contributors
* may be used to endorse or promote products derived from this software
* without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*/
#ifndef lint
#if 0
static char sccsid[] = "@(#)sys_term.c 8.2 (Berkeley) 12/15/93";
#endif
static const char rcsid[] =
"$FreeBSD$";
#endif /* not lint */
#include "telnetd.h"
#include "pathnames.h"
#if defined(AUTHENTICATION)
#include <libtelnet/auth.h>
#endif
extern char *altlogin;
#if defined(CRAY) || defined(__hpux)
# define PARENT_DOES_UTMP
#endif
#ifdef NEWINIT
#include <initreq.h>
#else /* NEWINIT*/
# ifdef UTMPX
# include <utmpx.h>
struct utmpx wtmp;
# else
# include <utmp.h>
struct utmp wtmp;
# endif /* UTMPX */
# ifndef PARENT_DOES_UTMP
#ifdef _PATH_WTMP
char wtmpf[] = _PATH_WTMP;
#else
char wtmpf[] = "/usr/adm/wtmp";
#endif
#ifdef _PATH_UTMP
char utmpf[] = _PATH_UTMP;
#else
char utmpf[] = "/etc/utmp";
#endif
# else /* PARENT_DOES_UTMP */
char wtmpf[] = "/etc/wtmp";
# endif /* PARENT_DOES_UTMP */
# ifdef CRAY
#include <tmpdir.h>
#include <sys/wait.h>
# if defined(_SC_CRAY_SECURE_SYS) && !defined(SCM_SECURITY)
/*
* UNICOS 6.0/6.1 do not have SCM_SECURITY defined, so we can
* use it to tell us to turn off all the socket security code,
* since that is only used in UNICOS 7.0 and later.
*/
# undef _SC_CRAY_SECURE_SYS
# endif
# if defined(_SC_CRAY_SECURE_SYS)
#include <sys/sysv.h>
#include <sys/secstat.h>
extern int secflag;
extern struct sysv sysv;
# endif /* _SC_CRAY_SECURE_SYS */
# endif /* CRAY */
#endif /* NEWINIT */
#ifdef STREAMSPTY
#include <sac.h>
#include <sys/stropts.h>
#endif
#define SCPYN(a, b) (void) strncpy(a, b, sizeof(a))
#define SCMPN(a, b) strncmp(a, b, sizeof(a))
#ifdef STREAMS
#include <sys/stream.h>
#endif
#ifdef __hpux
#include <sys/resource.h>
#include <sys/proc.h>
#endif
#include <sys/tty.h>
#ifdef t_erase
#undef t_erase
#undef t_kill
#undef t_intrc
#undef t_quitc
#undef t_startc
#undef t_stopc
#undef t_eofc
#undef t_brkc
#undef t_suspc
#undef t_dsuspc
#undef t_rprntc
#undef t_flushc
#undef t_werasc
#undef t_lnextc
#endif
#if defined(UNICOS5) && defined(CRAY2) && !defined(EXTPROC)
# define EXTPROC 0400
#endif
#ifndef USE_TERMIO
struct termbuf {
struct sgttyb sg;
struct tchars tc;
struct ltchars ltc;
int state;
int lflags;
} termbuf, termbuf2;
# define cfsetospeed(tp, val) (tp)->sg.sg_ospeed = (val)
# define cfsetispeed(tp, val) (tp)->sg.sg_ispeed = (val)
# define cfgetospeed(tp) (tp)->sg.sg_ospeed
# define cfgetispeed(tp) (tp)->sg.sg_ispeed
#else /* USE_TERMIO */
# ifdef SYSV_TERMIO
# define termios termio
# endif
# ifndef TCSANOW
# ifdef TCSETS
# define TCSANOW TCSETS
# define TCSADRAIN TCSETSW
# define tcgetattr(f, t) ioctl(f, TCGETS, (char *)t)
# else
# ifdef TCSETA
# define TCSANOW TCSETA
# define TCSADRAIN TCSETAW
# define tcgetattr(f, t) ioctl(f, TCGETA, (char *)t)
# else
# define TCSANOW TIOCSETA
# define TCSADRAIN TIOCSETAW
# define tcgetattr(f, t) ioctl(f, TIOCGETA, (char *)t)
# endif
# endif
# define tcsetattr(f, a, t) ioctl(f, a, t)
# define cfsetospeed(tp, val) (tp)->c_cflag &= ~CBAUD; \
(tp)->c_cflag |= (val)
# define cfgetospeed(tp) ((tp)->c_cflag & CBAUD)
# ifdef CIBAUD
# define cfsetispeed(tp, val) (tp)->c_cflag &= ~CIBAUD; \
(tp)->c_cflag |= ((val)<<IBSHIFT)
# define cfgetispeed(tp) (((tp)->c_cflag & CIBAUD)>>IBSHIFT)
# else
# define cfsetispeed(tp, val) (tp)->c_cflag &= ~CBAUD; \
(tp)->c_cflag |= (val)
# define cfgetispeed(tp) ((tp)->c_cflag & CBAUD)
# endif
# endif /* TCSANOW */
struct termios termbuf, termbuf2; /* pty control structure */
# ifdef STREAMSPTY
int ttyfd = -1;
# endif
#endif /* USE_TERMIO */
#include <sys/types.h>
#include <libutil.h>
int cleanopen __P((char *));
void scrub_env __P((void));
/*
* init_termbuf()
* copy_termbuf(cp)
* set_termbuf()
*
* These three routines are used to get and set the "termbuf" structure
* to and from the kernel. init_termbuf() gets the current settings.
* copy_termbuf() hands in a new "termbuf" to write to the kernel, and
* set_termbuf() writes the structure into the kernel.
*/
void
init_termbuf()
{
#ifndef USE_TERMIO
(void) ioctl(pty, TIOCGETP, (char *)&termbuf.sg);
(void) ioctl(pty, TIOCGETC, (char *)&termbuf.tc);
(void) ioctl(pty, TIOCGLTC, (char *)&termbuf.ltc);
# ifdef TIOCGSTATE
(void) ioctl(pty, TIOCGSTATE, (char *)&termbuf.state);
# endif
#else
# ifdef STREAMSPTY
(void) tcgetattr(ttyfd, &termbuf);
# else
(void) tcgetattr(pty, &termbuf);
# endif
#endif
termbuf2 = termbuf;
}
#if defined(LINEMODE) && defined(TIOCPKT_IOCTL)
void
copy_termbuf(cp, len)
char *cp;
int len;
{
if (len > sizeof(termbuf))
len = sizeof(termbuf);
bcopy(cp, (char *)&termbuf, len);
termbuf2 = termbuf;
}
#endif /* defined(LINEMODE) && defined(TIOCPKT_IOCTL) */
void
set_termbuf()
{
/*
* Only make the necessary changes.
*/
#ifndef USE_TERMIO
if (bcmp((char *)&termbuf.sg, (char *)&termbuf2.sg, sizeof(termbuf.sg)))
(void) ioctl(pty, TIOCSETN, (char *)&termbuf.sg);
if (bcmp((char *)&termbuf.tc, (char *)&termbuf2.tc, sizeof(termbuf.tc)))
(void) ioctl(pty, TIOCSETC, (char *)&termbuf.tc);
if (bcmp((char *)&termbuf.ltc, (char *)&termbuf2.ltc,
sizeof(termbuf.ltc)))
(void) ioctl(pty, TIOCSLTC, (char *)&termbuf.ltc);
if (termbuf.lflags != termbuf2.lflags)
(void) ioctl(pty, TIOCLSET, (char *)&termbuf.lflags);
#else /* USE_TERMIO */
if (bcmp((char *)&termbuf, (char *)&termbuf2, sizeof(termbuf)))
# ifdef STREAMSPTY
(void) tcsetattr(ttyfd, TCSANOW, &termbuf);
# else
(void) tcsetattr(pty, TCSANOW, &termbuf);
# endif
# if defined(CRAY2) && defined(UNICOS5)
needtermstat = 1;
# endif
#endif /* USE_TERMIO */
}
/*
* spcset(func, valp, valpp)
*
* This function takes various special characters (func), and
* sets *valp to the current value of that character, and
* *valpp to point to where in the "termbuf" structure that
* value is kept.
*
* It returns the SLC_ level of support for this function.
*/
#ifndef USE_TERMIO
int
spcset(func, valp, valpp)
int func;
cc_t *valp;
cc_t **valpp;
{
switch(func) {
case SLC_EOF:
*valp = termbuf.tc.t_eofc;
*valpp = (cc_t *)&termbuf.tc.t_eofc;
return(SLC_VARIABLE);
case SLC_EC:
*valp = termbuf.sg.sg_erase;
*valpp = (cc_t *)&termbuf.sg.sg_erase;
return(SLC_VARIABLE);
case SLC_EL:
*valp = termbuf.sg.sg_kill;
*valpp = (cc_t *)&termbuf.sg.sg_kill;
return(SLC_VARIABLE);
case SLC_IP:
*valp = termbuf.tc.t_intrc;
*valpp = (cc_t *)&termbuf.tc.t_intrc;
return(SLC_VARIABLE|SLC_FLUSHIN|SLC_FLUSHOUT);
case SLC_ABORT:
*valp = termbuf.tc.t_quitc;
*valpp = (cc_t *)&termbuf.tc.t_quitc;
return(SLC_VARIABLE|SLC_FLUSHIN|SLC_FLUSHOUT);
case SLC_XON:
*valp = termbuf.tc.t_startc;
*valpp = (cc_t *)&termbuf.tc.t_startc;
return(SLC_VARIABLE);
case SLC_XOFF:
*valp = termbuf.tc.t_stopc;
*valpp = (cc_t *)&termbuf.tc.t_stopc;
return(SLC_VARIABLE);
case SLC_AO:
*valp = termbuf.ltc.t_flushc;
*valpp = (cc_t *)&termbuf.ltc.t_flushc;
return(SLC_VARIABLE);
case SLC_SUSP:
*valp = termbuf.ltc.t_suspc;
*valpp = (cc_t *)&termbuf.ltc.t_suspc;
return(SLC_VARIABLE);
case SLC_EW:
*valp = termbuf.ltc.t_werasc;
*valpp = (cc_t *)&termbuf.ltc.t_werasc;
return(SLC_VARIABLE);
case SLC_RP:
*valp = termbuf.ltc.t_rprntc;
*valpp = (cc_t *)&termbuf.ltc.t_rprntc;
return(SLC_VARIABLE);
case SLC_LNEXT:
*valp = termbuf.ltc.t_lnextc;
*valpp = (cc_t *)&termbuf.ltc.t_lnextc;
return(SLC_VARIABLE);
case SLC_FORW1:
*valp = termbuf.tc.t_brkc;
*valpp = (cc_t *)&termbuf.ltc.t_lnextc;
return(SLC_VARIABLE);
case SLC_BRK:
case SLC_SYNCH:
case SLC_AYT:
case SLC_EOR:
*valp = (cc_t)0;
*valpp = (cc_t *)0;
return(SLC_DEFAULT);
default:
*valp = (cc_t)0;
*valpp = (cc_t *)0;
return(SLC_NOSUPPORT);
}
}
#else /* USE_TERMIO */
int
spcset(func, valp, valpp)
int func;
cc_t *valp;
cc_t **valpp;
{
#define setval(a, b) *valp = termbuf.c_cc[a]; \
*valpp = &termbuf.c_cc[a]; \
return(b);
#define defval(a) *valp = ((cc_t)a); *valpp = (cc_t *)0; return(SLC_DEFAULT);
switch(func) {
case SLC_EOF:
setval(VEOF, SLC_VARIABLE);
case SLC_EC:
setval(VERASE, SLC_VARIABLE);
case SLC_EL:
setval(VKILL, SLC_VARIABLE);
case SLC_IP:
setval(VINTR, SLC_VARIABLE|SLC_FLUSHIN|SLC_FLUSHOUT);
case SLC_ABORT:
setval(VQUIT, SLC_VARIABLE|SLC_FLUSHIN|SLC_FLUSHOUT);
case SLC_XON:
#ifdef VSTART
setval(VSTART, SLC_VARIABLE);
#else
defval(0x13);
#endif
case SLC_XOFF:
#ifdef VSTOP
setval(VSTOP, SLC_VARIABLE);
#else
defval(0x11);
#endif
case SLC_EW:
#ifdef VWERASE
setval(VWERASE, SLC_VARIABLE);
#else
defval(0);
#endif
case SLC_RP:
#ifdef VREPRINT
setval(VREPRINT, SLC_VARIABLE);
#else
defval(0);
#endif
case SLC_LNEXT:
#ifdef VLNEXT
setval(VLNEXT, SLC_VARIABLE);
#else
defval(0);
#endif
case SLC_AO:
#if !defined(VDISCARD) && defined(VFLUSHO)
# define VDISCARD VFLUSHO
#endif
#ifdef VDISCARD
setval(VDISCARD, SLC_VARIABLE|SLC_FLUSHOUT);
#else
defval(0);
#endif
case SLC_SUSP:
#ifdef VSUSP
setval(VSUSP, SLC_VARIABLE|SLC_FLUSHIN);
#else
defval(0);
#endif
#ifdef VEOL
case SLC_FORW1:
setval(VEOL, SLC_VARIABLE);
#endif
#ifdef VEOL2
case SLC_FORW2:
setval(VEOL2, SLC_VARIABLE);
#endif
case SLC_AYT:
#ifdef VSTATUS
setval(VSTATUS, SLC_VARIABLE);
#else
defval(0);
#endif
case SLC_BRK:
case SLC_SYNCH:
case SLC_EOR:
defval(0);
default:
*valp = 0;
*valpp = 0;
return(SLC_NOSUPPORT);
}
}
#endif /* USE_TERMIO */
#ifdef CRAY
/*
* getnpty()
*
* Return the number of pty's configured into the system.
*/
int
getnpty()
{
#ifdef _SC_CRAY_NPTY
int numptys;
if ((numptys = sysconf(_SC_CRAY_NPTY)) != -1)
return numptys;
else
#endif /* _SC_CRAY_NPTY */
return 128;
}
#endif /* CRAY */
#ifndef convex
/*
* getpty()
*
* Allocate a pty. As a side effect, the external character
* array "line" contains the name of the slave side.
*
* Returns the file descriptor of the opened pty.
*/
#ifndef __GNUC__
char *line = "\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0";
#else
static char Xline[] = "\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0";
char *line = Xline;
#endif
#ifdef CRAY
char *myline = "\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0";
#endif /* CRAY */
int
getpty(ptynum)
int *ptynum;
{
register int p;
#ifdef STREAMSPTY
int t;
char *ptsname();
p = open("/dev/ptmx", 2);
if (p > 0) {
grantpt(p);
unlockpt(p);
strcpy(line, ptsname(p));
return(p);
}
#else /* ! STREAMSPTY */
#ifndef CRAY
register char *cp, *p1, *p2;
register int i;
#if defined(sun) && defined(TIOCGPGRP) && BSD < 199207
int dummy;
#endif
#ifndef __hpux
(void) strcpy(line, "/dev/ptyXX");
p1 = &line[8];
p2 = &line[9];
#else
(void) strcpy(line, "/dev/ptym/ptyXX");
p1 = &line[13];
p2 = &line[14];
#endif
for (cp = "pqrsPQRS"; *cp; cp++) {
struct stat stb;
*p1 = *cp;
*p2 = '0';
/*
* This stat() check is just to keep us from
* looping through all 256 combinations if there
* aren't that many ptys available.
*/
if (stat(line, &stb) < 0)
break;
for (i = 0; i < 32; i++) {
*p2 = "0123456789abcdefghijklmnopqrstuv"[i];
p = open(line, 2);
if (p > 0) {
#ifndef __hpux
line[5] = 't';
#else
for (p1 = &line[8]; *p1; p1++)
*p1 = *(p1+1);
line[9] = 't';
#endif
chown(line, 0, 0);
chmod(line, 0600);
#if defined(sun) && defined(TIOCGPGRP) && BSD < 199207
if (ioctl(p, TIOCGPGRP, &dummy) == 0
|| errno != EIO) {
chmod(line, 0666);
close(p);
line[5] = 'p';
} else
#endif /* defined(sun) && defined(TIOCGPGRP) && BSD < 199207 */
return(p);
}
}
}
#else /* CRAY */
extern lowpty, highpty;
struct stat sb;
for (*ptynum = lowpty; *ptynum <= highpty; (*ptynum)++) {
(void) sprintf(myline, "/dev/pty/%03d", *ptynum);
p = open(myline, 2);
if (p < 0)
continue;
(void) sprintf(line, "/dev/ttyp%03d", *ptynum);
/*
* Here are some shenanigans to make sure that there
* are no listeners lurking on the line.
*/
if(stat(line, &sb) < 0) {
(void) close(p);
continue;
}
if(sb.st_uid || sb.st_gid || sb.st_mode != 0600) {
chown(line, 0, 0);
chmod(line, 0600);
(void)close(p);
p = open(myline, 2);
if (p < 0)
continue;
}
/*
* Now it should be safe...check for accessability.
*/
if (access(line, 6) == 0)
return(p);
else {
/* no tty side to pty so skip it */
(void) close(p);
}
}
#endif /* CRAY */
#endif /* STREAMSPTY */
return(-1);
}
#endif /* convex */
#ifdef LINEMODE
/*
* tty_flowmode() Find out if flow control is enabled or disabled.
* tty_linemode() Find out if linemode (external processing) is enabled.
* tty_setlinemod(on) Turn on/off linemode.
* tty_isecho() Find out if echoing is turned on.
* tty_setecho(on) Enable/disable character echoing.
* tty_israw() Find out if terminal is in RAW mode.
* tty_binaryin(on) Turn on/off BINARY on input.
* tty_binaryout(on) Turn on/off BINARY on output.
* tty_isediting() Find out if line editing is enabled.
* tty_istrapsig() Find out if signal trapping is enabled.
* tty_setedit(on) Turn on/off line editing.
* tty_setsig(on) Turn on/off signal trapping.
* tty_issofttab() Find out if tab expansion is enabled.
* tty_setsofttab(on) Turn on/off soft tab expansion.
* tty_islitecho() Find out if typed control chars are echoed literally
* tty_setlitecho() Turn on/off literal echo of control chars
* tty_tspeed(val) Set transmit speed to val.
* tty_rspeed(val) Set receive speed to val.
*/
#ifdef convex
static int linestate;
#endif
int
tty_linemode()
{
#ifndef convex
#ifndef USE_TERMIO
return(termbuf.state & TS_EXTPROC);
#else
return(termbuf.c_lflag & EXTPROC);
#endif
#else
return(linestate);
#endif
}
void
tty_setlinemode(on)
int on;
{
#ifdef TIOCEXT
# ifndef convex
set_termbuf();
# else
linestate = on;
# endif
(void) ioctl(pty, TIOCEXT, (char *)&on);
# ifndef convex
init_termbuf();
# endif
#else /* !TIOCEXT */
# ifdef EXTPROC
if (on)
termbuf.c_lflag |= EXTPROC;
else
termbuf.c_lflag &= ~EXTPROC;
# endif
#endif /* TIOCEXT */
}
#endif /* LINEMODE */
int
tty_isecho()
{
#ifndef USE_TERMIO
return (termbuf.sg.sg_flags & ECHO);
#else
return (termbuf.c_lflag & ECHO);
#endif
}
int
tty_flowmode()
{
#ifndef USE_TERMIO
return(((termbuf.tc.t_startc) > 0 && (termbuf.tc.t_stopc) > 0) ? 1 : 0);
#else
return((termbuf.c_iflag & IXON) ? 1 : 0);
#endif
}
int
tty_restartany()
{
#ifndef USE_TERMIO
# ifdef DECCTQ
return((termbuf.lflags & DECCTQ) ? 0 : 1);
# else
return(-1);
# endif
#else
return((termbuf.c_iflag & IXANY) ? 1 : 0);
#endif
}
void
tty_setecho(on)
int on;
{
#ifndef USE_TERMIO
if (on)
termbuf.sg.sg_flags |= ECHO|CRMOD;
else
termbuf.sg.sg_flags &= ~(ECHO|CRMOD);
#else
if (on)
termbuf.c_lflag |= ECHO;
else
termbuf.c_lflag &= ~ECHO;
#endif
}
int
tty_israw()
{
#ifndef USE_TERMIO
return(termbuf.sg.sg_flags & RAW);
#else
return(!(termbuf.c_lflag & ICANON));
#endif
}
#if defined (AUTHENTICATION) && defined(NO_LOGIN_F) && defined(LOGIN_R)
int
tty_setraw(on)
{
# ifndef USE_TERMIO
if (on)
termbuf.sg.sg_flags |= RAW;
else
termbuf.sg.sg_flags &= ~RAW;
# else
if (on)
termbuf.c_lflag &= ~ICANON;
else
termbuf.c_lflag |= ICANON;
# endif
}
#endif
void
tty_binaryin(on)
int on;
{
#ifndef USE_TERMIO
if (on)
termbuf.lflags |= LPASS8;
else
termbuf.lflags &= ~LPASS8;
#else
if (on) {
termbuf.c_iflag &= ~ISTRIP;
} else {
termbuf.c_iflag |= ISTRIP;
}
#endif
}
void
tty_binaryout(on)
int on;
{
#ifndef USE_TERMIO
if (on)
termbuf.lflags |= LLITOUT;
else
termbuf.lflags &= ~LLITOUT;
#else
if (on) {
termbuf.c_cflag &= ~(CSIZE|PARENB);
termbuf.c_cflag |= CS8;
termbuf.c_oflag &= ~OPOST;
} else {
termbuf.c_cflag &= ~CSIZE;
termbuf.c_cflag |= CS7|PARENB;
termbuf.c_oflag |= OPOST;
}
#endif
}
int
tty_isbinaryin()
{
#ifndef USE_TERMIO
return(termbuf.lflags & LPASS8);
#else
return(!(termbuf.c_iflag & ISTRIP));
#endif
}
int
tty_isbinaryout()
{
#ifndef USE_TERMIO
return(termbuf.lflags & LLITOUT);
#else
return(!(termbuf.c_oflag&OPOST));
#endif
}
#ifdef LINEMODE
int
tty_isediting()
{
#ifndef USE_TERMIO
return(!(termbuf.sg.sg_flags & (CBREAK|RAW)));
#else
return(termbuf.c_lflag & ICANON);
#endif
}
int
tty_istrapsig()
{
#ifndef USE_TERMIO
return(!(termbuf.sg.sg_flags&RAW));
#else
return(termbuf.c_lflag & ISIG);
#endif
}
void
tty_setedit(on)
int on;
{
#ifndef USE_TERMIO
if (on)
termbuf.sg.sg_flags &= ~CBREAK;
else
termbuf.sg.sg_flags |= CBREAK;
#else
if (on)
termbuf.c_lflag |= ICANON;
else
termbuf.c_lflag &= ~ICANON;
#endif
}
void
tty_setsig(on)
int on;
{
#ifndef USE_TERMIO
if (on)
;
#else
if (on)
termbuf.c_lflag |= ISIG;
else
termbuf.c_lflag &= ~ISIG;
#endif
}
#endif /* LINEMODE */
int
tty_issofttab()
{
#ifndef USE_TERMIO
return (termbuf.sg.sg_flags & XTABS);
#else
# ifdef OXTABS
return (termbuf.c_oflag & OXTABS);
# endif
# ifdef TABDLY
return ((termbuf.c_oflag & TABDLY) == TAB3);
# endif
#endif
}
void
tty_setsofttab(on)
int on;
{
#ifndef USE_TERMIO
if (on)
termbuf.sg.sg_flags |= XTABS;
else
termbuf.sg.sg_flags &= ~XTABS;
#else
if (on) {
# ifdef OXTABS
termbuf.c_oflag |= OXTABS;
# endif
# ifdef TABDLY
termbuf.c_oflag &= ~TABDLY;
termbuf.c_oflag |= TAB3;
# endif
} else {
# ifdef OXTABS
termbuf.c_oflag &= ~OXTABS;
# endif
# ifdef TABDLY
termbuf.c_oflag &= ~TABDLY;
termbuf.c_oflag |= TAB0;
# endif
}
#endif
}
int
tty_islitecho()
{
#ifndef USE_TERMIO
return (!(termbuf.lflags & LCTLECH));
#else
# ifdef ECHOCTL
return (!(termbuf.c_lflag & ECHOCTL));
# endif
# ifdef TCTLECH
return (!(termbuf.c_lflag & TCTLECH));
# endif
# if !defined(ECHOCTL) && !defined(TCTLECH)
return (0); /* assumes ctl chars are echoed '^x' */
# endif
#endif
}
void
tty_setlitecho(on)
int on;
{
#ifndef USE_TERMIO
if (on)
termbuf.lflags &= ~LCTLECH;
else
termbuf.lflags |= LCTLECH;
#else
# ifdef ECHOCTL
if (on)
termbuf.c_lflag &= ~ECHOCTL;
else
termbuf.c_lflag |= ECHOCTL;
# endif
# ifdef TCTLECH
if (on)
termbuf.c_lflag &= ~TCTLECH;
else
termbuf.c_lflag |= TCTLECH;
# endif
#endif
}
int
tty_iscrnl()
{
#ifndef USE_TERMIO
return (termbuf.sg.sg_flags & CRMOD);
#else
return (termbuf.c_iflag & ICRNL);
#endif
}
/*
* Try to guess whether speeds are "encoded" (4.2BSD) or just numeric (4.4BSD).
*/
#if B4800 != 4800
#define DECODE_BAUD
#endif
#ifdef DECODE_BAUD
/*
* A table of available terminal speeds
*/
struct termspeeds {
int speed;
int value;
} termspeeds[] = {
{ 0, B0 }, { 50, B50 }, { 75, B75 },
{ 110, B110 }, { 134, B134 }, { 150, B150 },
{ 200, B200 }, { 300, B300 }, { 600, B600 },
{ 1200, B1200 }, { 1800, B1800 }, { 2400, B2400 },
{ 4800, B4800 }, { 9600, B9600 }, { 19200, B9600 },
{ 38400, B9600 }, { -1, B9600 }
};
#endif /* DECODE_BAUD */
void
tty_tspeed(val)
int val;
{
#ifdef DECODE_BAUD
register struct termspeeds *tp;
for (tp = termspeeds; (tp->speed != -1) && (val > tp->speed); tp++)
;
cfsetospeed(&termbuf, tp->value);
#else /* DECODE_BAUD */
cfsetospeed(&termbuf, val);
#endif /* DECODE_BAUD */
}
void
tty_rspeed(val)
int val;
{
#ifdef DECODE_BAUD
register struct termspeeds *tp;
for (tp = termspeeds; (tp->speed != -1) && (val > tp->speed); tp++)
;
cfsetispeed(&termbuf, tp->value);
#else /* DECODE_BAUD */
cfsetispeed(&termbuf, val);
#endif /* DECODE_BAUD */
}
#if defined(CRAY2) && defined(UNICOS5)
int
tty_isnewmap()
{
return((termbuf.c_oflag & OPOST) && (termbuf.c_oflag & ONLCR) &&
!(termbuf.c_oflag & ONLRET));
}
#endif
#ifdef PARENT_DOES_UTMP
# ifndef NEWINIT
extern struct utmp wtmp;
extern char wtmpf[];
# else /* NEWINIT */
int gotalarm;
/* ARGSUSED */
void
nologinproc(sig)
int sig;
{
gotalarm++;
}
# endif /* NEWINIT */
#endif /* PARENT_DOES_UTMP */
#ifndef NEWINIT
# ifdef PARENT_DOES_UTMP
extern void utmp_sig_init P((void));
extern void utmp_sig_reset P((void));
extern void utmp_sig_wait P((void));
extern void utmp_sig_notify P((int));
# endif /* PARENT_DOES_UTMP */
#endif
/*
* getptyslave()
*
* Open the slave side of the pty, and do any initialization
* that is necessary.
*/
void
getptyslave()
{
register int t = -1;
char erase;
#if !defined(CRAY) || !defined(NEWINIT)
# ifdef LINEMODE
int waslm;
# endif
# ifdef TIOCGWINSZ
struct winsize ws;
extern int def_row, def_col;
# endif
extern int def_tspeed, def_rspeed;
/*
* Opening the slave side may cause initilization of the
* kernel tty structure. We need remember the state of
* if linemode was turned on
* terminal window size
* terminal speed
* erase character
* so that we can re-set them if we need to.
*/
# ifdef LINEMODE
waslm = tty_linemode();
# endif
erase = termbuf.c_cc[VERASE];
/*
* Make sure that we don't have a controlling tty, and
* that we are the session (process group) leader.
*/
# ifdef TIOCNOTTY
t = open(_PATH_TTY, O_RDWR);
if (t >= 0) {
(void) ioctl(t, TIOCNOTTY, (char *)0);
(void) close(t);
}
# endif
# ifdef PARENT_DOES_UTMP
/*
* Wait for our parent to get the utmp stuff to get done.
*/
utmp_sig_wait();
# endif
t = cleanopen(line);
if (t < 0)
fatalperror(net, line);
#ifdef STREAMSPTY
#ifdef USE_TERMIO
ttyfd = t;
#endif
if (ioctl(t, I_PUSH, "ptem") < 0)
fatal(net, "I_PUSH ptem");
if (ioctl(t, I_PUSH, "ldterm") < 0)
fatal(net, "I_PUSH ldterm");
if (ioctl(t, I_PUSH, "ttcompat") < 0)
fatal(net, "I_PUSH ttcompat");
if (ioctl(pty, I_PUSH, "pckt") < 0)
fatal(net, "I_PUSH pckt");
#endif
/*
* set up the tty modes as we like them to be.
*/
init_termbuf();
# ifdef TIOCGWINSZ
if (def_row || def_col) {
bzero((char *)&ws, sizeof(ws));
ws.ws_col = def_col;
ws.ws_row = def_row;
(void)ioctl(t, TIOCSWINSZ, (char *)&ws);
}
# endif
/*
* Settings for sgtty based systems
*/
# ifndef USE_TERMIO
termbuf.sg.sg_flags |= CRMOD|ANYP|ECHO|XTABS;
# endif /* USE_TERMIO */
/*
* Settings for UNICOS (and HPUX)
*/
# if defined(CRAY) || defined(__hpux)
termbuf.c_oflag = OPOST|ONLCR|TAB3;
termbuf.c_iflag = IGNPAR|ISTRIP|ICRNL|IXON;
termbuf.c_lflag = ISIG|ICANON|ECHO|ECHOE|ECHOK;
termbuf.c_cflag = EXTB|HUPCL|CS8;
# endif
/*
* Settings for all other termios/termio based
* systems, other than 4.4BSD. In 4.4BSD the
* kernel does the initial terminal setup.
*/
# if defined(USE_TERMIO) && !(defined(CRAY) || defined(__hpux)) && (BSD <= 43)
# ifndef OXTABS
# define OXTABS 0
# endif
termbuf.c_lflag |= ECHO;
termbuf.c_oflag |= ONLCR|OXTABS;
termbuf.c_iflag |= ICRNL;
termbuf.c_iflag &= ~IXOFF;
# endif /* defined(USE_TERMIO) && !defined(CRAY) && (BSD <= 43) */
tty_rspeed((def_rspeed > 0) ? def_rspeed : 9600);
tty_tspeed((def_tspeed > 0) ? def_tspeed : 9600);
if (erase)
termbuf.c_cc[VERASE] = erase;
# ifdef LINEMODE
if (waslm)
tty_setlinemode(1);
# endif /* LINEMODE */
/*
* Set the tty modes, and make this our controlling tty.
*/
set_termbuf();
if (login_tty(t) == -1)
fatalperror(net, "login_tty");
#endif /* !defined(CRAY) || !defined(NEWINIT) */
if (net > 2)
(void) close(net);
#if defined(AUTHENTICATION) && defined(NO_LOGIN_F) && defined(LOGIN_R)
/*
* Leave the pty open so that we can write out the rlogin
* protocol for /bin/login, if the authentication works.
*/
#else
if (pty > 2) {
(void) close(pty);
pty = -1;
}
#endif
}
#if !defined(CRAY) || !defined(NEWINIT)
#ifndef O_NOCTTY
#define O_NOCTTY 0
#endif
/*
* Open the specified slave side of the pty,
* making sure that we have a clean tty.
*/
int
cleanopen(line)
char *line;
{
register int t;
#if defined(_SC_CRAY_SECURE_SYS)
struct secstat secbuf;
#endif /* _SC_CRAY_SECURE_SYS */
#ifndef STREAMSPTY
/*
* Make sure that other people can't open the
* slave side of the connection.
*/
(void) chown(line, 0, 0);
(void) chmod(line, 0600);
#endif
# if !defined(CRAY) && (BSD > 43)
(void) revoke(line);
# endif
#if defined(_SC_CRAY_SECURE_SYS)
if (secflag) {
if (secstat(line, &secbuf) < 0)
return(-1);
if (setulvl(secbuf.st_slevel) < 0)
return(-1);
if (setucmp(secbuf.st_compart) < 0)
return(-1);
}
#endif /* _SC_CRAY_SECURE_SYS */
t = open(line, O_RDWR|O_NOCTTY);
#if defined(_SC_CRAY_SECURE_SYS)
if (secflag) {
if (setulvl(sysv.sy_minlvl) < 0)
return(-1);
if (setucmp(0) < 0)
return(-1);
}
#endif /* _SC_CRAY_SECURE_SYS */
if (t < 0)
return(-1);
/*
* Hangup anybody else using this ttyp, then reopen it for
* ourselves.
*/
# if !(defined(CRAY) || defined(__hpux)) && (BSD <= 43) && !defined(STREAMSPTY)
(void) signal(SIGHUP, SIG_IGN);
vhangup();
(void) signal(SIGHUP, SIG_DFL);
t = open(line, O_RDWR|O_NOCTTY);
if (t < 0)
return(-1);
# endif
# if defined(CRAY) && defined(TCVHUP)
{
register int i;
(void) signal(SIGHUP, SIG_IGN);
(void) ioctl(t, TCVHUP, (char *)0);
(void) signal(SIGHUP, SIG_DFL);
setpgrp();
#if defined(_SC_CRAY_SECURE_SYS)
if (secflag) {
if (secstat(line, &secbuf) < 0)
return(-1);
if (setulvl(secbuf.st_slevel) < 0)
return(-1);
if (setucmp(secbuf.st_compart) < 0)
return(-1);
}
#endif /* _SC_CRAY_SECURE_SYS */
i = open(line, O_RDWR);
#if defined(_SC_CRAY_SECURE_SYS)
if (secflag) {
if (setulvl(sysv.sy_minlvl) < 0)
return(-1);
if (setucmp(0) < 0)
return(-1);
}
#endif /* _SC_CRAY_SECURE_SYS */
if (i < 0)
return(-1);
(void) close(t);
t = i;
}
# endif /* defined(CRAY) && defined(TCVHUP) */
return(t);
}
#endif /* !defined(CRAY) || !defined(NEWINIT) */
#if BSD <= 43
int
login_tty(t)
int t;
{
if (setsid() < 0) {
#ifdef ultrix
/*
* The setsid() may have failed because we
* already have a pgrp == pid. Zero out
* our pgrp and try again...
*/
if ((setpgrp(0, 0) < 0) || (setsid() < 0))
#endif
fatalperror(net, "setsid()");
}
# ifdef TIOCSCTTY
if (ioctl(t, TIOCSCTTY, (char *)0) < 0)
fatalperror(net, "ioctl(sctty)");
# if defined(CRAY)
/*
* Close the hard fd to /dev/ttypXXX, and re-open through
* the indirect /dev/tty interface.
*/
close(t);
if ((t = open("/dev/tty", O_RDWR)) < 0)
fatalperror(net, "open(/dev/tty)");
# endif
# else
/*
* We get our controlling tty assigned as a side-effect
* of opening up a tty device. But on BSD based systems,
* this only happens if our process group is zero. The
* setsid() call above may have set our pgrp, so clear
* it out before opening the tty...
*/
(void) setpgrp(0, 0);
close(open(line, O_RDWR));
# endif
if (t != 0)
(void) dup2(t, 0);
if (t != 1)
(void) dup2(t, 1);
if (t != 2)
(void) dup2(t, 2);
if (t > 2)
close(t);
return(0);
}
#endif /* BSD <= 43 */
#ifdef NEWINIT
char *gen_id = "fe";
#endif
/*
* startslave(host)
*
* Given a hostname, do whatever
* is necessary to startup the login process on the slave side of the pty.
*/
/* ARGSUSED */
void
startslave(host, autologin, autoname)
char *host;
int autologin;
char *autoname;
{
register int i;
#ifdef NEWINIT
extern char *ptyip;
struct init_request request;
void nologinproc();
register int n;
#endif /* NEWINIT */
#if defined(AUTHENTICATION)
if (!autoname || !autoname[0])
autologin = 0;
if (autologin < auth_level) {
fatal(net, "Authorization failed");
exit(1);
}
#endif
#ifndef NEWINIT
# ifdef PARENT_DOES_UTMP
utmp_sig_init();
# endif /* PARENT_DOES_UTMP */
if ((i = fork()) < 0)
fatalperror(net, "fork");
if (i) {
# ifdef PARENT_DOES_UTMP
/*
* Cray parent will create utmp entry for child and send
* signal to child to tell when done. Child waits for signal
* before doing anything important.
*/
register int pid = i;
void sigjob P((int));
setpgrp();
utmp_sig_reset(); /* reset handler to default */
/*
* Create utmp entry for child
*/
(void) time(&wtmp.ut_time);
wtmp.ut_type = LOGIN_PROCESS;
wtmp.ut_pid = pid;
SCPYN(wtmp.ut_user, "LOGIN");
SCPYN(wtmp.ut_host, host);
SCPYN(wtmp.ut_line, line + sizeof("/dev/") - 1);
#ifndef __hpux
SCPYN(wtmp.ut_id, wtmp.ut_line+3);
#else
SCPYN(wtmp.ut_id, wtmp.ut_line+7);
#endif
pututline(&wtmp);
endutent();
if ((i = open(wtmpf, O_WRONLY|O_APPEND)) >= 0) {
(void) write(i, (char *)&wtmp, sizeof(struct utmp));
(void) close(i);
}
#ifdef CRAY
(void) signal(WJSIGNAL, sigjob);
#endif
utmp_sig_notify(pid);
# endif /* PARENT_DOES_UTMP */
} else {
getptyslave(autologin);
start_login(host, autologin, autoname);
/*NOTREACHED*/
}
#else /* NEWINIT */
/*
* Init will start up login process if we ask nicely. We only wait
* for it to start up and begin normal telnet operation.
*/
if ((i = open(INIT_FIFO, O_WRONLY)) < 0) {
char tbuf[128];
(void) snprintf(tbuf, sizeof(tbuf), "Can't open %s\n", INIT_FIFO);
fatalperror(net, tbuf);
}
memset((char *)&request, 0, sizeof(request));
request.magic = INIT_MAGIC;
SCPYN(request.gen_id, gen_id);
SCPYN(request.tty_id, &line[8]);
SCPYN(request.host, host);
SCPYN(request.term_type, terminaltype ? terminaltype : "network");
#if !defined(UNICOS5)
request.signal = SIGCLD;
request.pid = getpid();
#endif
#ifdef BFTPDAEMON
/*
* Are we working as the bftp daemon?
*/
if (bftpd) {
SCPYN(request.exec_name, BFTPPATH);
}
#endif /* BFTPDAEMON */
if (write(i, (char *)&request, sizeof(request)) < 0) {
char tbuf[128];
(void) snprintf(tbuf, sizeof(tbuf), "Can't write to %s\n", INIT_FIFO);
fatalperror(net, tbuf);
}
(void) close(i);
(void) signal(SIGALRM, nologinproc);
for (i = 0; ; i++) {
char tbuf[128];
alarm(15);
n = read(pty, ptyip, BUFSIZ);
if (i == 3 || n >= 0 || !gotalarm)
break;
gotalarm = 0;
snprintf(tbuf, sizeof(tbuf), "telnetd: waiting for /etc/init to start login process on %s\r\n", line);
(void) write(net, tbuf, strlen(tbuf));
}
if (n < 0 && gotalarm)
fatal(net, "/etc/init didn't start login process");
pcc += n;
alarm(0);
(void) signal(SIGALRM, SIG_DFL);
return;
#endif /* NEWINIT */
}
char *envinit[3];
extern char **environ;
void
init_env()
{
extern char *getenv();
char **envp;
envp = envinit;
if ((*envp = getenv("TZ")))
*envp++ -= 3;
#if defined(CRAY) || defined(__hpux)
else
*envp++ = "TZ=GMT0";
#endif
*envp = 0;
environ = envinit;
}
#ifndef NEWINIT
/*
* start_login(host)
*
* Assuming that we are now running as a child processes, this
* function will turn us into the login process.
*/
void
start_login(host, autologin, name)
char *host;
int autologin;
char *name;
{
register char **argv;
char **addarg();
extern char *getenv();
#ifdef UTMPX
register int pid = getpid();
struct utmpx utmpx;
#endif
#ifdef SOLARIS
char *term;
char termbuf[64];
#endif
#ifdef UTMPX
/*
* Create utmp entry for child
*/
bzero(&utmpx, sizeof(utmpx));
SCPYN(utmpx.ut_user, ".telnet");
SCPYN(utmpx.ut_line, line + sizeof("/dev/") - 1);
utmpx.ut_pid = pid;
utmpx.ut_id[0] = 't';
utmpx.ut_id[1] = 'n';
utmpx.ut_id[2] = SC_WILDC;
utmpx.ut_id[3] = SC_WILDC;
utmpx.ut_type = LOGIN_PROCESS;
(void) time(&utmpx.ut_tv.tv_sec);
if (makeutx(&utmpx) == NULL)
fatal(net, "makeutx failed");
#endif
scrub_env();
/*
* -h : pass on name of host.
* WARNING: -h is accepted by login if and only if
* getuid() == 0.
* -p : don't clobber the environment (so terminal type stays set).
*
* -f : force this login, he has already been authenticated
*/
argv = addarg(0, "login");
#if !defined(NO_LOGIN_H)
# if defined (AUTHENTICATION) && defined(NO_LOGIN_F) && defined(LOGIN_R)
/*
* Don't add the "-h host" option if we are going
* to be adding the "-r host" option down below...
*/
if ((auth_level < 0) || (autologin != AUTH_VALID))
# endif
{
argv = addarg(argv, "-h");
argv = addarg(argv, host);
#ifdef SOLARIS
/*
* SVR4 version of -h takes TERM= as second arg, or -
*/
term = getenv("TERM");
if (term == NULL || term[0] == 0) {
term = "-";
} else {
strcpy(termbuf, "TERM=");
strncat(termbuf, term, sizeof(termbuf) - 6);
term = termbuf;
}
argv = addarg(argv, term);
#endif
}
#endif
#if !defined(NO_LOGIN_P)
argv = addarg(argv, "-p");
#endif
#ifdef BFTPDAEMON
/*
* Are we working as the bftp daemon? If so, then ask login
* to start bftp instead of shell.
*/
if (bftpd) {
argv = addarg(argv, "-e");
argv = addarg(argv, BFTPPATH);
} else
#endif
#if defined (SecurID)
/*
* don't worry about the -f that might get sent.
* A -s is supposed to override it anyhow.
*/
if (require_SecurID)
argv = addarg(argv, "-s");
#endif
#if defined (AUTHENTICATION)
if (auth_level >= 0 && autologin == AUTH_VALID) {
# if !defined(NO_LOGIN_F)
argv = addarg(argv, "-f");
argv = addarg(argv, "--");
argv = addarg(argv, name);
# else
# if defined(LOGIN_R)
/*
* We don't have support for "login -f", but we
* can fool /bin/login into thinking that we are
* rlogind, and allow us to log in without a
* password. The rlogin protocol expects
* local-user\0remote-user\0term/speed\0
*/
if (pty > 2) {
register char *cp;
char speed[128];
int isecho, israw, xpty, len;
extern int def_rspeed;
# ifndef LOGIN_HOST
/*
* Tell login that we are coming from "localhost".
* If we passed in the real host name, then the
* user would have to allow .rhost access from
* every machine that they want authenticated
* access to work from, which sort of defeats
* the purpose of an authenticated login...
* So, we tell login that the session is coming
* from "localhost", and the user will only have
* to have "localhost" in their .rhost file.
*/
# define LOGIN_HOST "localhost"
# endif
argv = addarg(argv, "-r");
argv = addarg(argv, LOGIN_HOST);
xpty = pty;
# ifndef STREAMSPTY
pty = 0;
# else
ttyfd = 0;
# endif
init_termbuf();
isecho = tty_isecho();
israw = tty_israw();
if (isecho || !israw) {
tty_setecho(0); /* Turn off echo */
tty_setraw(1); /* Turn on raw */
set_termbuf();
}
len = strlen(name)+1;
write(xpty, name, len);
write(xpty, name, len);
snprintf(speed, sizeof(speed),
"%s/%d", (cp = getenv("TERM")) ? cp : "",
(def_rspeed > 0) ? def_rspeed : 9600);
len = strlen(speed)+1;
write(xpty, speed, len);
if (isecho || !israw) {
init_termbuf();
tty_setecho(isecho);
tty_setraw(israw);
set_termbuf();
if (!israw) {
/*
* Write a newline to ensure
* that login will be able to
* read the line...
*/
write(xpty, "\n", 1);
}
}
pty = xpty;
}
# else
argv = addarg(argv, "--");
argv = addarg(argv, name);
# endif
# endif
} else
#endif
if (getenv("USER")) {
argv = addarg(argv, "--");
argv = addarg(argv, getenv("USER"));
#if defined(LOGIN_ARGS) && defined(NO_LOGIN_P)
{
register char **cpp;
for (cpp = environ; *cpp; cpp++)
argv = addarg(argv, *cpp);
}
#endif
/*
* Assume that login will set the USER variable
* correctly. For SysV systems, this means that
* USER will no longer be set, just LOGNAME by
* login. (The problem is that if the auto-login
* fails, and the user then specifies a different
* account name, he can get logged in with both
* LOGNAME and USER in his environment, but the
* USER value will be wrong.
*/
unsetenv("USER");
}
#if defined(AUTHENTICATION) && defined(NO_LOGIN_F) && defined(LOGIN_R)
if (pty > 2)
close(pty);
#endif
closelog();
if (altlogin == NULL) {
altlogin = _PATH_LOGIN;
}
execv(altlogin, argv);
syslog(LOG_ERR, "%s: %m", altlogin);
fatalperror(net, altlogin);
/*NOTREACHED*/
}
char **
addarg(argv, val)
register char **argv;
register char *val;
{
register char **cpp;
if (argv == NULL) {
/*
* 10 entries, a leading length, and a null
*/
argv = (char **)malloc(sizeof(*argv) * 12);
if (argv == NULL)
return(NULL);
*argv++ = (char *)10;
*argv = (char *)0;
}
for (cpp = argv; *cpp; cpp++)
;
if (cpp == &argv[(long)argv[-1]]) {
--argv;
*argv = (char *)((long)(*argv) + 10);
argv = (char **)realloc(argv, (long)(*argv) + 2);
if (argv == NULL)
return(NULL);
argv++;
cpp = &argv[(long)argv[-1] - 10];
}
*cpp++ = val;
*cpp = 0;
return(argv);
}
#endif /* NEWINIT */
/*
* scrub_env()
*
* Remove a few things from the environment that
* don't need to be there.
*/
void
scrub_env()
{
register char **cpp, **cpp2;
for (cpp2 = cpp = environ; *cpp; cpp++) {
#ifdef __FreeBSD__
if (strncmp(*cpp, "LD_LIBRARY_PATH=", 16) &&
strncmp(*cpp, "LD_PRELOAD=", 11) &&
#else
if (strncmp(*cpp, "LD_", 3) &&
strncmp(*cpp, "_RLD_", 5) &&
strncmp(*cpp, "LIBPATH=", 8) &&
#endif
strncmp(*cpp, "LOCALDOMAIN=", 12) &&
strncmp(*cpp, "RES_OPTIONS=", 12) &&
strncmp(*cpp, "TERMINFO=", 9) &&
strncmp(*cpp, "TERMINFO_DIRS=", 14) &&
strncmp(*cpp, "TERMPATH=", 9) &&
strncmp(*cpp, "TERMCAP=/", 9) &&
strncmp(*cpp, "ENV=", 4) &&
strncmp(*cpp, "IFS=", 4))
*cpp2++ = *cpp;
}
*cpp2 = 0;
}
/*
* cleanup()
*
* This is the routine to call when we are all through, to
* clean up anything that needs to be cleaned up.
*/
/* ARGSUSED */
void
cleanup(sig)
int sig;
{
#ifndef PARENT_DOES_UTMP
# if (BSD > 43) || defined(convex)
char *p;
p = line + sizeof("/dev/") - 1;
if (logout(p))
logwtmp(p, "", "");
(void)chmod(line, 0666);
(void)chown(line, 0, 0);
*p = 'p';
(void)chmod(line, 0666);
(void)chown(line, 0, 0);
(void) shutdown(net, 2);
exit(1);
# else
void rmut();
rmut();
vhangup(); /* XXX */
(void) shutdown(net, 2);
exit(1);
# endif
#else /* PARENT_DOES_UTMP */
# ifdef NEWINIT
(void) shutdown(net, 2);
exit(1);
# else /* NEWINIT */
# ifdef CRAY
static int incleanup = 0;
register int t;
/*
* 1: Pick up the zombie, if we are being called
* as the signal handler.
* 2: If we are a nested cleanup(), return.
* 3: Try to clean up TMPDIR.
* 4: Fill in utmp with shutdown of process.
* 5: Close down the network and pty connections.
* 6: Finish up the TMPDIR cleanup, if needed.
*/
if (sig == SIGCHLD)
while (waitpid(-1, 0, WNOHANG) > 0)
; /* VOID */
t = sigblock(sigmask(SIGCHLD));
if (incleanup) {
sigsetmask(t);
return;
}
incleanup = 1;
sigsetmask(t);
if (secflag) {
/*
* We need to set ourselves back to a null
* label to clean up.
*/
setulvl(sysv.sy_minlvl);
setucmp((long)0);
}
t = cleantmp(&wtmp);
setutent(); /* just to make sure */
# endif /* CRAY */
rmut(line);
close(pty);
(void) shutdown(net, 2);
# ifdef CRAY
if (t == 0)
cleantmp(&wtmp);
# endif /* CRAY */
exit(1);
# endif /* NEWINT */
#endif /* PARENT_DOES_UTMP */
}
#if defined(PARENT_DOES_UTMP) && !defined(NEWINIT)
/*
* _utmp_sig_rcv
* utmp_sig_init
* utmp_sig_wait
* These three functions are used to coordinate the handling of
* the utmp file between the server and the soon-to-be-login shell.
* The server actually creates the utmp structure, the child calls
* utmp_sig_wait(), until the server calls utmp_sig_notify() and
* signals the future-login shell to proceed.
*/
static int caught=0; /* NZ when signal intercepted */
static void (*func)(); /* address of previous handler */
void
_utmp_sig_rcv(sig)
int sig;
{
caught = 1;
(void) signal(SIGUSR1, func);
}
void
utmp_sig_init()
{
/*
* register signal handler for UTMP creation
*/
if ((int)(func = signal(SIGUSR1, _utmp_sig_rcv)) == -1)
fatalperror(net, "telnetd/signal");
}
void
utmp_sig_reset()
{
(void) signal(SIGUSR1, func); /* reset handler to default */
}
# ifdef __hpux
# define sigoff() /* do nothing */
# define sigon() /* do nothing */
# endif
void
utmp_sig_wait()
{
/*
* Wait for parent to write our utmp entry.
*/
sigoff();
while (caught == 0) {
pause(); /* wait until we get a signal (sigon) */
sigoff(); /* turn off signals while we check caught */
}
sigon(); /* turn on signals again */
}
void
utmp_sig_notify(pid)
{
kill(pid, SIGUSR1);
}
# ifdef CRAY
static int gotsigjob = 0;
/*ARGSUSED*/
void
sigjob(sig)
int sig;
{
register int jid;
register struct jobtemp *jp;
while ((jid = waitjob(NULL)) != -1) {
if (jid == 0) {
return;
}
gotsigjob++;
jobend(jid, NULL, NULL);
}
}
/*
* Clean up the TMPDIR that login created.
* The first time this is called we pick up the info
* from the utmp. If the job has already gone away,
* then we'll clean up and be done. If not, then
* when this is called the second time it will wait
* for the signal that the job is done.
*/
int
cleantmp(wtp)
register struct utmp *wtp;
{
struct utmp *utp;
static int first = 1;
register int mask, omask, ret;
extern struct utmp *getutid P((const struct utmp *_Id));
mask = sigmask(WJSIGNAL);
if (first == 0) {
omask = sigblock(mask);
while (gotsigjob == 0)
sigpause(omask);
return(1);
}
first = 0;
setutent(); /* just to make sure */
utp = getutid(wtp);
if (utp == 0) {
syslog(LOG_ERR, "can't get /etc/utmp entry to clean TMPDIR");
return(-1);
}
/*
* Nothing to clean up if the user shell was never started.
*/
if (utp->ut_type != USER_PROCESS || utp->ut_jid == 0)
return(1);
/*
* Block the WJSIGNAL while we are in jobend().
*/
omask = sigblock(mask);
ret = jobend(utp->ut_jid, utp->ut_tpath, utp->ut_user);
sigsetmask(omask);
return(ret);
}
int
jobend(jid, path, user)
register int jid;
register char *path;
register char *user;
{
static int saved_jid = 0;
static char saved_path[sizeof(wtmp.ut_tpath)+1];
static char saved_user[sizeof(wtmp.ut_user)+1];
if (path) {
strncpy(saved_path, path, sizeof(wtmp.ut_tpath));
strncpy(saved_user, user, sizeof(wtmp.ut_user));
saved_path[sizeof(saved_path)] = '\0';
saved_user[sizeof(saved_user)] = '\0';
}
if (saved_jid == 0) {
saved_jid = jid;
return(0);
}
cleantmpdir(jid, saved_path, saved_user);
return(1);
}
/*
* Fork a child process to clean up the TMPDIR
*/
cleantmpdir(jid, tpath, user)
register int jid;
register char *tpath;
register char *user;
{
switch(fork()) {
case -1:
syslog(LOG_ERR, "TMPDIR cleanup(%s): fork() failed: %m",
tpath);
break;
case 0:
execl(CLEANTMPCMD, CLEANTMPCMD, user, tpath, 0);
syslog(LOG_ERR, "TMPDIR cleanup(%s): execl(%s) failed: %m",
tpath, CLEANTMPCMD);
exit(1);
default:
/*
* Forget about child. We will exit, and
* /etc/init will pick it up.
*/
break;
}
}
# endif /* CRAY */
#endif /* defined(PARENT_DOES_UTMP) && !defined(NEWINIT) */
/*
* rmut()
*
* This is the function called by cleanup() to
* remove the utmp entry for this person.
*/
#ifdef UTMPX
void
rmut()
{
register f;
int found = 0;
struct utmp *u, *utmp;
int nutmp;
struct stat statbf;
struct utmpx *utxp, utmpx;
/*
* This updates the utmpx and utmp entries and make a wtmp/x entry
*/
SCPYN(utmpx.ut_line, line + sizeof("/dev/") - 1);
utxp = getutxline(&utmpx);
if (utxp) {
utxp->ut_type = DEAD_PROCESS;
utxp->ut_exit.e_termination = 0;
utxp->ut_exit.e_exit = 0;
(void) time(&utmpx.ut_tv.tv_sec);
utmpx.ut_tv.tv_usec = 0;
modutx(utxp);
}
endutxent();
} /* end of rmut */
#endif
#if !defined(UTMPX) && !(defined(CRAY) || defined(__hpux)) && BSD <= 43
void
rmut()
{
register f;
int found = 0;
struct utmp *u, *utmp;
int nutmp;
struct stat statbf;
f = open(utmpf, O_RDWR);
if (f >= 0) {
(void) fstat(f, &statbf);
utmp = (struct utmp *)malloc((unsigned)statbf.st_size);
if (!utmp)
syslog(LOG_ERR, "utmp malloc failed");
if (statbf.st_size && utmp) {
nutmp = read(f, (char *)utmp, (int)statbf.st_size);
nutmp /= sizeof(struct utmp);
for (u = utmp ; u < &utmp[nutmp] ; u++) {
if (SCMPN(u->ut_line, line+5) ||
u->ut_name[0]==0)
continue;
(void) lseek(f, ((long)u)-((long)utmp), L_SET);
SCPYN(u->ut_name, "");
SCPYN(u->ut_host, "");
(void) time(&u->ut_time);
(void) write(f, (char *)u, sizeof(wtmp));
found++;
}
}
(void) close(f);
}
if (found) {
f = open(wtmpf, O_WRONLY|O_APPEND);
if (f >= 0) {
SCPYN(wtmp.ut_line, line+5);
SCPYN(wtmp.ut_name, "");
SCPYN(wtmp.ut_host, "");
(void) time(&wtmp.ut_time);
(void) write(f, (char *)&wtmp, sizeof(wtmp));
(void) close(f);
}
}
(void) chmod(line, 0666);
(void) chown(line, 0, 0);
line[strlen("/dev/")] = 'p';
(void) chmod(line, 0666);
(void) chown(line, 0, 0);
} /* end of rmut */
#endif /* CRAY */
#ifdef __hpux
rmut (line)
char *line;
{
struct utmp utmp;
struct utmp *utptr;
int fd; /* for /etc/wtmp */
utmp.ut_type = USER_PROCESS;
(void) strncpy(utmp.ut_id, line+12, sizeof(utmp.ut_id));
(void) setutent();
utptr = getutid(&utmp);
/* write it out only if it exists */
if (utptr) {
utptr->ut_type = DEAD_PROCESS;
utptr->ut_time = time((long *) 0);
(void) pututline(utptr);
/* set wtmp entry if wtmp file exists */
if ((fd = open(wtmpf, O_WRONLY | O_APPEND)) >= 0) {
(void) write(fd, utptr, sizeof(utmp));
(void) close(fd);
}
}
(void) endutent();
(void) chmod(line, 0666);
(void) chown(line, 0, 0);
line[14] = line[13];
line[13] = line[12];
line[8] = 'm';
line[9] = '/';
line[10] = 'p';
line[11] = 't';
line[12] = 'y';
(void) chmod(line, 0666);
(void) chown(line, 0, 0);
}
#endif
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