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qtermwidget-packaging/lib/kpty.cpp

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/*
This file is part of the KDE libraries
Copyright (C) 2002 Waldo Bastian <bastian@kde.org>
Copyright (C) 2002-2003,2007 Oswald Buddenhagen <ossi@kde.org>
Rewritten for QT4 by e_k <e_k at users.sourceforge.net>, Copyright (C)2008
This library is free software; you can redistribute it and/or
modify it under the terms of the GNU Library General Public
License as published by the Free Software Foundation; either
version 2 of the License, or (at your option) any later version.
This library 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
Library General Public License for more details.
You should have received a copy of the GNU Library General Public License
along with this library; see the file COPYING.LIB. If not, write to
the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
Boston, MA 02110-1301, USA.
*/
#include "kpty_p.h"
#include <QtDebug>
#if defined(__FreeBSD__) || defined(__NetBSD__) || defined(__OpenBSD__) || defined(__DragonFly__)
#define HAVE_LOGIN
#define HAVE_LIBUTIL_H
#endif
#ifdef __sgi
#define __svr4__
#endif
#ifdef __osf__
#define _OSF_SOURCE
#include <float.h>
#endif
#ifdef _AIX
#define _ALL_SOURCE
#endif
// __USE_XOPEN isn't defined by default in ICC
// (needed for ptsname(), grantpt() and unlockpt())
#ifdef __INTEL_COMPILER
# ifndef __USE_XOPEN
# define __USE_XOPEN
# endif
#endif
#include <sys/types.h>
#include <sys/ioctl.h>
#include <sys/time.h>
#include <sys/resource.h>
#include <sys/stat.h>
#include <sys/param.h>
#include <errno.h>
#include <fcntl.h>
#include <time.h>
#include <stdlib.h>
#include <stdio.h>
#include <string.h>
#include <unistd.h>
#include <grp.h>
#if defined(HAVE_PTY_H)
# include <pty.h>
#endif
#ifdef HAVE_LIBUTIL_H
# include <libutil.h>
#elif defined(HAVE_UTIL_H)
# include <util.h>
#endif
#ifdef HAVE_UTEMPTER
extern "C" {
# include <utempter.h>
}
#else
# include <utmp.h>
# ifdef HAVE_UTMPX
# include <utmpx.h>
# endif
# if !defined(_PATH_UTMPX) && defined(_UTMPX_FILE)
# define _PATH_UTMPX _UTMPX_FILE
# endif
# ifdef HAVE_UPDWTMPX
# if !defined(_PATH_WTMPX) && defined(_WTMPX_FILE)
# define _PATH_WTMPX _WTMPX_FILE
# endif
# endif
#endif
/* for HP-UX (some versions) the extern C is needed, and for other
platforms it doesn't hurt */
extern "C" {
#include <termios.h>
#if defined(HAVE_TERMIO_H)
# include <termio.h> // struct winsize on some systems
#endif
}
#if defined (_HPUX_SOURCE)
# define _TERMIOS_INCLUDED
# include <bsdtty.h>
#endif
#ifdef HAVE_SYS_STROPTS_H
# include <sys/stropts.h> // Defines I_PUSH
# define _NEW_TTY_CTRL
#endif
#if defined (__FreeBSD__) || defined(__FreeBSD_kernel__) || defined (__NetBSD__) || defined (__OpenBSD__) || defined (__bsdi__) || defined(__APPLE__) || defined (__DragonFly__)
# define _tcgetattr(fd, ttmode) ioctl(fd, TIOCGETA, (char *)ttmode)
#else
# if defined(_HPUX_SOURCE) || defined(__Lynx__) || defined (__CYGWIN__) || defined(__GNU__)
# define _tcgetattr(fd, ttmode) tcgetattr(fd, ttmode)
# else
# define _tcgetattr(fd, ttmode) ioctl(fd, TCGETS, (char *)ttmode)
# endif
#endif
#if defined (__FreeBSD__) || defined(__FreeBSD_kernel__) || defined (__NetBSD__) || defined (__OpenBSD__) || defined (__bsdi__) || defined(__APPLE__) || defined (__DragonFly__)
# define _tcsetattr(fd, ttmode) ioctl(fd, TIOCSETA, (char *)ttmode)
#else
# if defined(_HPUX_SOURCE) || defined(__CYGWIN__) || defined(__GNU__)
# define _tcsetattr(fd, ttmode) tcsetattr(fd, TCSANOW, ttmode)
# else
# define _tcsetattr(fd, ttmode) ioctl(fd, TCSETS, (char *)ttmode)
# endif
#endif
//#include <kdebug.h>
//#include <kstandarddirs.h> // findExe
// not defined on HP-UX for example
#ifndef CTRL
# define CTRL(x) ((x) & 037)
#endif
#define TTY_GROUP "tty"
///////////////////////
// private functions //
///////////////////////
//////////////////
// private data //
//////////////////
KPtyPrivate::KPtyPrivate(KPty* parent) :
masterFd(-1), slaveFd(-1), ownMaster(true), q_ptr(parent)
{
}
KPtyPrivate::~KPtyPrivate()
{
}
bool KPtyPrivate::chownpty(bool)
{
// return !QProcess::execute(KStandardDirs::findExe("kgrantpty"),
// QStringList() << (grant?"--grant":"--revoke") << QString::number(masterFd));
return true;
}
/////////////////////////////
// public member functions //
/////////////////////////////
KPty::KPty() :
d_ptr(new KPtyPrivate(this))
{
}
KPty::KPty(KPtyPrivate *d) :
d_ptr(d)
{
d_ptr->q_ptr = this;
}
KPty::~KPty()
{
close();
delete d_ptr;
}
bool KPty::open()
{
Q_D(KPty);
if (d->masterFd >= 0)
return true;
d->ownMaster = true;
QByteArray ptyName;
// Find a master pty that we can open ////////////////////////////////
// Because not all the pty animals are created equal, they want to
// be opened by several different methods.
// We try, as we know them, one by one.
#ifdef HAVE_OPENPTY
char ptsn[PATH_MAX];
if (::openpty( &d->masterFd, &d->slaveFd, ptsn, 0, 0)) {
d->masterFd = -1;
d->slaveFd = -1;
qWarning(175) << "Can't open a pseudo teletype";
return false;
}
d->ttyName = ptsn;
#else
#ifdef HAVE__GETPTY // irix
char *ptsn = _getpty(&d->masterFd, O_RDWR|O_NOCTTY, S_IRUSR|S_IWUSR, 0);
if (ptsn) {
d->ttyName = ptsn;
goto grantedpt;
}
#elif defined(HAVE_PTSNAME) || defined(TIOCGPTN)
#ifdef HAVE_POSIX_OPENPT
d->masterFd = ::posix_openpt(O_RDWR|O_NOCTTY);
#elif defined(HAVE_GETPT)
d->masterFd = ::getpt();
#elif defined(PTM_DEVICE)
d->masterFd = ::open(PTM_DEVICE, O_RDWR|O_NOCTTY);
#else
# error No method to open a PTY master detected.
#endif
if (d->masterFd >= 0) {
#ifdef HAVE_PTSNAME
char *ptsn = ptsname(d->masterFd);
if (ptsn) {
d->ttyName = ptsn;
#else
int ptyno;
if (!ioctl(d->masterFd, TIOCGPTN, &ptyno)) {
d->ttyName = QByteArray("/dev/pts/") + QByteArray::number(ptyno);
#endif
#ifdef HAVE_GRANTPT
if (!grantpt(d->masterFd)) {
goto grantedpt;
}
#else
goto gotpty;
#endif
}
::close(d->masterFd);
d->masterFd = -1;
}
#endif // HAVE_PTSNAME || TIOCGPTN
// Linux device names, FIXME: Trouble on other systems?
for (const char * s3 = "pqrstuvwxyzabcde"; *s3; s3++) {
for (const char * s4 = "0123456789abcdef"; *s4; s4++) {
ptyName = QString().sprintf("/dev/pty%c%c", *s3, *s4).toUtf8();
d->ttyName = QString().sprintf("/dev/tty%c%c", *s3, *s4).toUtf8();
d->masterFd = ::open(ptyName.data(), O_RDWR);
if (d->masterFd >= 0) {
#ifdef Q_OS_SOLARIS
/* Need to check the process group of the pty.
* If it exists, then the slave pty is in use,
* and we need to get another one.
*/
int pgrp_rtn;
if (ioctl(d->masterFd, TIOCGPGRP, &pgrp_rtn) == 0 || errno != EIO) {
::close(d->masterFd);
d->masterFd = -1;
continue;
}
#endif /* Q_OS_SOLARIS */
if (!access(d->ttyName.data(),R_OK|W_OK)) { // checks availability based on permission bits
if (!geteuid()) {
struct group * p = getgrnam(TTY_GROUP);
if (!p) {
p = getgrnam("wheel");
}
gid_t gid = p ? p->gr_gid : getgid ();
if (!chown(d->ttyName.data(), getuid(), gid)) {
chmod(d->ttyName.data(), S_IRUSR|S_IWUSR|S_IWGRP);
}
}
goto gotpty;
}
::close(d->masterFd);
d->masterFd = -1;
}
}
}
qWarning() << "Can't open a pseudo teletype";
return false;
gotpty:
struct stat st;
if (stat(d->ttyName.data(), &st)) {
return false; // this just cannot happen ... *cough* Yeah right, I just
// had it happen when pty #349 was allocated. I guess
// there was some sort of leak? I only had a few open.
}
if (((st.st_uid != getuid()) ||
(st.st_mode & (S_IRGRP|S_IXGRP|S_IROTH|S_IWOTH|S_IXOTH))) &&
!d->chownpty(true)) {
qWarning()
<< "chownpty failed for device " << ptyName << "::" << d->ttyName
<< "\nThis means the communication can be eavesdropped." << endl;
}
#if defined (HAVE__GETPTY) || defined (HAVE_GRANTPT)
grantedpt:
#endif
#ifdef HAVE_REVOKE
revoke(d->ttyName.data());
#endif
#ifdef HAVE_UNLOCKPT
unlockpt(d->masterFd);
#elif defined(TIOCSPTLCK)
int flag = 0;
ioctl(d->masterFd, TIOCSPTLCK, &flag);
#endif
d->slaveFd = ::open(d->ttyName.data(), O_RDWR | O_NOCTTY);
if (d->slaveFd < 0) {
qWarning() << "Can't open slave pseudo teletype";
::close(d->masterFd);
d->masterFd = -1;
return false;
}
#if (defined(__svr4__) || defined(__sgi__))
// Solaris
ioctl(d->slaveFd, I_PUSH, "ptem");
ioctl(d->slaveFd, I_PUSH, "ldterm");
#endif
#endif /* HAVE_OPENPTY */
fcntl(d->masterFd, F_SETFD, FD_CLOEXEC);
fcntl(d->slaveFd, F_SETFD, FD_CLOEXEC);
return true;
}
bool KPty::open(int fd)
{
#if !defined(HAVE_PTSNAME) && !defined(TIOCGPTN)
qWarning() << "Unsupported attempt to open pty with fd" << fd;
return false;
#else
Q_D(KPty);
if (d->masterFd >= 0) {
qWarning() << "Attempting to open an already open pty";
return false;
}
d->ownMaster = false;
# ifdef HAVE_PTSNAME
char *ptsn = ptsname(fd);
if (ptsn) {
d->ttyName = ptsn;
# else
int ptyno;
if (!ioctl(fd, TIOCGPTN, &ptyno)) {
char buf[32];
sprintf(buf, "/dev/pts/%d", ptyno);
d->ttyName = buf;
# endif
} else {
qWarning() << "Failed to determine pty slave device for fd" << fd;
return false;
}
d->masterFd = fd;
if (!openSlave()) {
d->masterFd = -1;
return false;
}
return true;
#endif
}
void KPty::closeSlave()
{
Q_D(KPty);
if (d->slaveFd < 0) {
return;
}
::close(d->slaveFd);
d->slaveFd = -1;
}
bool KPty::openSlave()
{
Q_D(KPty);
if (d->slaveFd >= 0)
return true;
if (d->masterFd < 0) {
qDebug() << "Attempting to open pty slave while master is closed";
return false;
}
//d->slaveFd = KDE_open(d->ttyName.data(), O_RDWR | O_NOCTTY);
d->slaveFd = ::open(d->ttyName.data(), O_RDWR | O_NOCTTY);
if (d->slaveFd < 0) {
qDebug() << "Can't open slave pseudo teletype";
return false;
}
fcntl(d->slaveFd, F_SETFD, FD_CLOEXEC);
return true;
}
void KPty::close()
{
Q_D(KPty);
if (d->masterFd < 0) {
return;
}
closeSlave();
// don't bother resetting unix98 pty, it will go away after closing master anyway.
if (memcmp(d->ttyName.data(), "/dev/pts/", 9)) {
if (!geteuid()) {
struct stat st;
if (!stat(d->ttyName.data(), &st)) {
chown(d->ttyName.data(), 0, st.st_gid == getgid() ? 0 : -1);
chmod(d->ttyName.data(), S_IRUSR|S_IWUSR|S_IRGRP|S_IWGRP|S_IROTH|S_IWOTH);
}
} else {
fcntl(d->masterFd, F_SETFD, 0);
d->chownpty(false);
}
}
::close(d->masterFd);
d->masterFd = -1;
}
void KPty::setCTty()
{
Q_D(KPty);
// Setup job control //////////////////////////////////
// Become session leader, process group leader,
// and get rid of the old controlling terminal.
setsid();
// make our slave pty the new controlling terminal.
#ifdef TIOCSCTTY
ioctl(d->slaveFd, TIOCSCTTY, 0);
#else
// __svr4__ hack: the first tty opened after setsid() becomes controlling tty
::close(::open(d->ttyName, O_WRONLY, 0));
#endif
// make our new process group the foreground group on the pty
int pgrp = getpid();
#if defined(_POSIX_VERSION) || defined(__svr4__)
tcsetpgrp(d->slaveFd, pgrp);
#elif defined(TIOCSPGRP)
ioctl(d->slaveFd, TIOCSPGRP, (char *)&pgrp);
#endif
}
void KPty::login(const char * user, const char * remotehost)
{
#ifdef HAVE_UTEMPTER
Q_D(KPty);
addToUtmp(d->ttyName, remotehost, d->masterFd);
Q_UNUSED(user);
#else
# ifdef HAVE_UTMPX
struct utmpx l_struct;
# else
struct utmp l_struct;
# endif
memset(&l_struct, 0, sizeof(l_struct));
// note: strncpy without terminators _is_ correct here. man 4 utmp
if (user) {
strncpy(l_struct.ut_name, user, sizeof(l_struct.ut_name));
}
if (remotehost) {
strncpy(l_struct.ut_host, remotehost, sizeof(l_struct.ut_host));
# ifdef HAVE_STRUCT_UTMP_UT_SYSLEN
l_struct.ut_syslen = qMin(strlen(remotehost), sizeof(l_struct.ut_host));
# endif
}
# ifndef __GLIBC__
Q_D(KPty);
const char * str_ptr = d->ttyName.data();
if (!memcmp(str_ptr, "/dev/", 5)) {
str_ptr += 5;
}
strncpy(l_struct.ut_line, str_ptr, sizeof(l_struct.ut_line));
# ifdef HAVE_STRUCT_UTMP_UT_ID
strncpy(l_struct.ut_id,
str_ptr + strlen(str_ptr) - sizeof(l_struct.ut_id),
sizeof(l_struct.ut_id));
# endif
# endif
# ifdef HAVE_UTMPX
gettimeofday(&l_struct.ut_tv, 0);
# else
l_struct.ut_time = time(0);
# endif
# ifdef HAVE_LOGIN
# ifdef HAVE_LOGINX
::loginx(&l_struct);
# else
::login(&l_struct);
# endif
# else
# ifdef HAVE_STRUCT_UTMP_UT_TYPE
l_struct.ut_type = USER_PROCESS;
# endif
# ifdef HAVE_STRUCT_UTMP_UT_PID
l_struct.ut_pid = getpid();
# ifdef HAVE_STRUCT_UTMP_UT_SESSION
l_struct.ut_session = getsid(0);
# endif
# endif
# ifdef HAVE_UTMPX
utmpxname(_PATH_UTMPX);
setutxent();
pututxline(&l_struct);
endutxent();
# ifdef HAVE_UPDWTMPX
updwtmpx(_PATH_WTMPX, &l_struct);
# endif
# else
utmpname(_PATH_UTMP);
setutent();
pututline(&l_struct);
endutent();
updwtmp(_PATH_WTMP, &l_struct);
# endif
# endif
#endif
}
void KPty::logout()
{
#ifdef HAVE_UTEMPTER
Q_D(KPty);
removeLineFromUtmp(d->ttyName, d->masterFd);
#else
Q_D(KPty);
const char *str_ptr = d->ttyName.data();
if (!memcmp(str_ptr, "/dev/", 5)) {
str_ptr += 5;
}
# ifdef __GLIBC__
else {
const char * sl_ptr = strrchr(str_ptr, '/');
if (sl_ptr) {
str_ptr = sl_ptr + 1;
}
}
# endif
# ifdef HAVE_LOGIN
# ifdef HAVE_LOGINX
::logoutx(str_ptr, 0, DEAD_PROCESS);
# else
::logout(str_ptr);
# endif
# else
# ifdef HAVE_UTMPX
struct utmpx l_struct, *ut;
# else
struct utmp l_struct, *ut;
# endif
memset(&l_struct, 0, sizeof(l_struct));
strncpy(l_struct.ut_line, str_ptr, sizeof(l_struct.ut_line));
# ifdef HAVE_UTMPX
utmpxname(_PATH_UTMPX);
setutxent();
if ((ut = getutxline(&l_struct))) {
# else
utmpname(_PATH_UTMP);
setutent();
if ((ut = getutline(&l_struct))) {
# endif
memset(ut->ut_name, 0, sizeof(*ut->ut_name));
memset(ut->ut_host, 0, sizeof(*ut->ut_host));
# ifdef HAVE_STRUCT_UTMP_UT_SYSLEN
ut->ut_syslen = 0;
# endif
# ifdef HAVE_STRUCT_UTMP_UT_TYPE
ut->ut_type = DEAD_PROCESS;
# endif
# ifdef HAVE_UTMPX
gettimeofday(&ut->ut_tv, 0);
pututxline(ut);
}
endutxent();
# else
ut->ut_time = time(0);
pututline(ut);
}
endutent();
# endif
# endif
#endif
}
// XXX Supposedly, tc[gs]etattr do not work with the master on Solaris.
// Please verify.
bool KPty::tcGetAttr(struct ::termios * ttmode) const
{
Q_D(const KPty);
return _tcgetattr(d->masterFd, ttmode) == 0;
}
bool KPty::tcSetAttr(struct ::termios * ttmode)
{
Q_D(KPty);
return _tcsetattr(d->masterFd, ttmode) == 0;
}
bool KPty::setWinSize(int lines, int columns)
{
Q_D(KPty);
struct winsize winSize;
memset(&winSize, 0, sizeof(winSize));
winSize.ws_row = (unsigned short)lines;
winSize.ws_col = (unsigned short)columns;
return ioctl(d->masterFd, TIOCSWINSZ, (char *)&winSize) == 0;
}
bool KPty::setEcho(bool echo)
{
struct ::termios ttmode;
if (!tcGetAttr(&ttmode)) {
return false;
}
if (!echo) {
ttmode.c_lflag &= ~ECHO;
} else {
ttmode.c_lflag |= ECHO;
}
return tcSetAttr(&ttmode);
}
const char * KPty::ttyName() const
{
Q_D(const KPty);
return d->ttyName.data();
}
int KPty::masterFd() const
{
Q_D(const KPty);
return d->masterFd;
}
int KPty::slaveFd() const
{
Q_D(const KPty);
return d->slaveFd;
}
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