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tdebase/kioslave/sftp/process.cpp

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/* vi: ts=8 sts=4 sw=4
*
*
* This file is part of the KDE project, module kdesu.
* Copyright (C) 1999,2000 Geert Jansen <jansen@kde.org>
*
* This file tqcontains code from TEShell.C of the KDE konsole.
* Copyright (c) 1997,1998 by Lars Doelle <lars.doelle@on-line.de>
*
* This is free software; you can use this library under the GNU Library
* General Public License, version 2. See the file "COPYING.LIB" for the
* exact licensing terms.
*
* process.cpp: Functionality to build a front end to password asking
* terminal programs.
*/
#include <config.h>
#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include <fcntl.h>
#include <signal.h>
#include <errno.h>
#include <string.h>
#include <termios.h>
#include <signal.h>
#include <sys/types.h>
#include <sys/wait.h>
#include <sys/stat.h>
#include <sys/time.h>
#include <sys/resource.h>
#include <sys/socket.h>
#if defined(__SVR4) && defined(sun)
#include <stropts.h>
#include <sys/stream.h>
#endif
#ifdef HAVE_SYS_SELECT_H
#include <sys/select.h> // Needed on some systems.
#endif
#include <tqglobal.h>
#include <tqcstring.h>
#include <tqfile.h>
#include <kdebug.h>
#include <kstandarddirs.h>
#include "process.h"
#include <kdesu/kdesu_pty.h>
#include <kdesu/kcookie.h>
MyPtyProcess::MyPtyProcess()
{
m_bTerminal = false;
m_bErase = false;
m_pPTY = 0L;
m_Pid = -1;
m_Fd = -1;
}
int MyPtyProcess::init()
{
delete m_pPTY;
m_pPTY = new PTY();
m_Fd = m_pPTY->getpt();
if (m_Fd < 0)
return -1;
if ((m_pPTY->grantpt() < 0) || (m_pPTY->unlockpt() < 0))
{
kdError(PTYPROC) << k_lineinfo << "Master setup failed.\n" << endl;
m_Fd = -1;
return -1;
}
m_TTY = m_pPTY->ptsname();
m_stdoutBuf.resize(0);
m_stderrBuf.resize(0);
m_ptyBuf.resize(0);
return 0;
}
MyPtyProcess::~MyPtyProcess()
{
delete m_pPTY;
}
/*
* Read one line of input. The terminal is in canonical mode, so you always
* read a line at at time, but it's possible to receive multiple lines in
* one time.
*/
TQCString MyPtyProcess::readLineFrom(int fd, TQCString& inbuf, bool block)
{
int pos;
TQCString ret;
if (!inbuf.isEmpty())
{
pos = inbuf.find('\n');
if (pos == -1)
{
ret = inbuf;
inbuf.resize(0);
} else
{
ret = inbuf.left(pos);
inbuf = inbuf.mid(pos+1);
}
return ret;
}
int flags = fcntl(fd, F_GETFL);
if (flags < 0)
{
kdError(PTYPROC) << k_lineinfo << "fcntl(F_GETFL): " << perror << "\n";
return ret;
}
if (block)
flags &= ~O_NONBLOCK;
else
flags |= O_NONBLOCK;
if (fcntl(fd, F_SETFL, flags) < 0)
{
kdError(PTYPROC) << k_lineinfo << "fcntl(F_SETFL): " << perror << "\n";
return ret;
}
int nbytes;
char buf[256];
while (1)
{
nbytes = read(fd, buf, 255);
if (nbytes == -1)
{
if (errno == EINTR)
continue;
else break;
}
if (nbytes == 0)
break; // eof
buf[nbytes] = '\000';
inbuf += buf;
pos = inbuf.find('\n');
if (pos == -1)
{
ret = inbuf;
inbuf.resize(0);
} else
{
ret = inbuf.left(pos);
inbuf = inbuf.mid(pos+1);
}
break;
}
return ret;
}
void MyPtyProcess::writeLine(TQCString line, bool addnl)
{
if (!line.isEmpty())
write(m_Fd, line, line.length());
if (addnl)
write(m_Fd, "\n", 1);
}
void MyPtyProcess::unreadLineFrom(TQCString inbuf, TQCString line, bool addnl)
{
if (addnl)
line += '\n';
if (!line.isEmpty())
inbuf.prepend(line);
}
/*
* Fork and execute the command. This returns in the parent.
*/
int MyPtyProcess::exec(TQCString command, QCStringList args)
{
kdDebug(PTYPROC) << "MyPtyProcess::exec(): " << command << endl;// << ", args = " << args << endl;
if (init() < 0)
return -1;
// Open the pty slave before forking. See SetupTTY()
int slave = open(m_TTY, O_RDWR);
if (slave < 0)
{
kdError(PTYPROC) << k_lineinfo << "Could not open slave pty.\n";
return -1;
}
// Also create a socket pair to connect to standard in/out.
// This will allow use to bypass the terminal.
int inout[2];
int err[2];
int ok = 1;
ok &= socketpair(AF_UNIX, SOCK_STREAM, 0, inout) >= 0;
ok &= socketpair(AF_UNIX, SOCK_STREAM, 0, err ) >= 0;
if( !ok ) {
kdDebug(PTYPROC) << "Could not create socket" << endl;
return -1;
}
m_stdinout = inout[0];
m_err = err[0];
if ((m_Pid = fork()) == -1)
{
kdError(PTYPROC) << k_lineinfo << "fork(): " << perror << "\n";
return -1;
}
// Parent
if (m_Pid)
{
close(slave);
close(inout[1]);
close(err[1]);
return 0;
}
// Child
ok = 1;
ok &= dup2(inout[1], STDIN_FILENO) >= 0;
ok &= dup2(inout[1], STDOUT_FILENO) >= 0;
ok &= dup2(err[1], STDERR_FILENO) >= 0;
if( !ok )
{
kdError(PTYPROC) << "dup of socket descriptor failed" << endl;
_exit(1);
}
close(inout[1]);
close(inout[0]);
close(err[1]);
close(err[0]);
if (SetupTTY(slave) < 0)
_exit(1);
// From now on, terminal output goes through the tty.
TQCString path;
if (command.tqcontains('/'))
path = command;
else
{
TQString file = KStandardDirs::findExe(command);
if (file.isEmpty())
{
kdError(PTYPROC) << k_lineinfo << command << " not found\n";
_exit(1);
}
path = TQFile::encodeName(file);
}
int i;
const char * argp[32];
argp[0] = path;
QCStringList::Iterator it;
for (i=1, it=args.begin(); it!=args.end() && i<31; it++) {
argp[i++] = *it;
kdDebug(PTYPROC) << *it << endl;
}
argp[i] = 0L;
execv(path, (char * const *)argp);
kdError(PTYPROC) << k_lineinfo << "execv(\"" << path << "\"): " << perror << "\n";
_exit(1);
return -1; // Shut up compiler. Never reached.
}
/*
* Wait until the terminal is set into no echo mode. At least one su
* (RH6 w/ Linux-PAM patches) sets noecho mode AFTER writing the Password:
* prompt, using TCSAFLUSH. This flushes the terminal I/O queues, possibly
* taking the password with it. So we wait until no echo mode is set
* before writing the password.
* Note that this is done on the slave fd. While Linux allows tcgetattr() on
* the master side, Solaris doesn't.
*/
int MyPtyProcess::WaitSlave()
{
int slave = open(m_TTY, O_RDWR);
if (slave < 0)
{
kdError(PTYPROC) << k_lineinfo << "Could not open slave tty.\n";
return -1;
}
struct termios tio;
struct timeval tv;
while (1)
{
if (tcgetattr(slave, &tio) < 0)
{
kdError(PTYPROC) << k_lineinfo << "tcgetattr(): " << perror << "\n";
close(slave);
return -1;
}
if (tio.c_lflag & ECHO)
{
kdDebug(PTYPROC) << k_lineinfo << "Echo mode still on." << endl;
// sleep 1/10 sec
tv.tv_sec = 0; tv.tv_usec = 100000;
select(slave, 0L, 0L, 0L, &tv);
continue;
}
break;
}
close(slave);
return 0;
}
int MyPtyProcess::enableLocalEcho(bool enable)
{
int slave = open(m_TTY, O_RDWR);
if (slave < 0)
{
kdError(PTYPROC) << k_lineinfo << "Could not open slave tty.\n";
return -1;
}
struct termios tio;
if (tcgetattr(slave, &tio) < 0)
{
kdError(PTYPROC) << k_lineinfo << "tcgetattr(): " << perror << "\n";
close(slave); return -1;
}
if (enable)
tio.c_lflag |= ECHO;
else
tio.c_lflag &= ~ECHO;
if (tcsetattr(slave, TCSANOW, &tio) < 0)
{
kdError(PTYPROC) << k_lineinfo << "tcsetattr(): " << perror << "\n";
close(slave); return -1;
}
close(slave);
return 0;
}
/*
* Copy output to stdout until the child process exists, or a line of output
* matches `m_Exit'.
* We have to use waitpid() to test for exit. Merely waiting for EOF on the
* pty does not work, because the target process may have children still
* attached to the terminal.
*/
int MyPtyProcess::waitForChild()
{
int ret, state, retval = 1;
struct timeval tv;
fd_set fds;
FD_ZERO(&fds);
while (1)
{
tv.tv_sec = 1; tv.tv_usec = 0;
FD_SET(m_Fd, &fds);
ret = select(m_Fd+1, &fds, 0L, 0L, &tv);
if (ret == -1)
{
if (errno == EINTR) continue;
else
{
kdError(PTYPROC) << k_lineinfo << "select(): " << perror << "\n";
return -1;
}
}
if (ret)
{
TQCString line = readLine(false);
while (!line.isNull())
{
if (!m_Exit.isEmpty() && !qstrnicmp(line, m_Exit, m_Exit.length()))
kill(m_Pid, SIGTERM);
if (m_bTerminal)
{
fputs(line, stdout);
fputc('\n', stdout);
}
line = readLine(false);
}
}
// Check if the process is still alive
ret = waitpid(m_Pid, &state, WNOHANG);
if (ret < 0)
{
if (errno == ECHILD)
retval = 0;
else
kdError(PTYPROC) << k_lineinfo << "waitpid(): " << perror << "\n";
break;
}
if (ret == m_Pid)
{
if (WIFEXITED(state))
retval = WEXITSTATUS(state);
break;
}
}
return -retval;
}
/*
* SetupTTY: Creates a new session. The filedescriptor "fd" should be
* connected to the tty. It is closed after the tty is reopened to make it
* our controlling terminal. This way the tty is always opened at least once
* so we'll never get EIO when reading from it.
*/
int MyPtyProcess::SetupTTY(int fd)
{
// Reset signal handlers
for (int sig = 1; sig < NSIG; sig++)
signal(sig, SIG_DFL);
signal(SIGHUP, SIG_IGN);
// Close all file handles
// struct rlimit rlp;
// getrlimit(RLIMIT_NOFILE, &rlp);
// for (int i = 0; i < (int)rlp.rlim_cur; i++)
// if (i != fd) close(i);
// Create a new session.
setsid();
// Open slave. This will make it our controlling terminal
int slave = open(m_TTY, O_RDWR);
if (slave < 0)
{
kdError(PTYPROC) << k_lineinfo << "Could not open slave side: " << perror << "\n";
return -1;
}
close(fd);
#if defined(__SVR4) && defined(sun)
// Solaris STREAMS environment.
// Push these modules to make the stream look like a terminal.
ioctl(slave, I_PUSH, "ptem");
ioctl(slave, I_PUSH, "ldterm");
#endif
// Connect stdin, stdout and stderr
// dup2(slave, 0); dup2(slave, 1); dup2(slave, 2);
// if (slave > 2)
// close(slave);
// Disable OPOST processing. Otherwise, '\n' are (on Linux at least)
// translated to '\r\n'.
struct termios tio;
if (tcgetattr(slave, &tio) < 0)
{
kdError(PTYPROC) << k_lineinfo << "tcgetattr(): " << perror << "\n";
return -1;
}
tio.c_oflag &= ~OPOST;
if (tcsetattr(slave, TCSANOW, &tio) < 0)
{
kdError(PTYPROC) << k_lineinfo << "tcsetattr(): " << perror << "\n";
return -1;
}
return 0;
}