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