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-rw-r--r--tdeioslave/sftp/process.cpp493
1 files changed, 493 insertions, 0 deletions
diff --git a/tdeioslave/sftp/process.cpp b/tdeioslave/sftp/process.cpp
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+++ b/tdeioslave/sftp/process.cpp
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+/* vi: ts=8 sts=4 sw=4
+ *
+ *
+ * This file is part of the KDE project, module tdesu.
+ * Copyright (C) 1999,2000 Geert Jansen <jansen@kde.org>
+ *
+ * This file contains 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 <tdesu/tdesu_pty.h>
+#include <tdesu/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.contains('/'))
+ 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() && !tqstrnicmp(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;
+}
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