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-rw-r--r--kdesu/process.cpp626
1 files changed, 626 insertions, 0 deletions
diff --git a/kdesu/process.cpp b/kdesu/process.cpp
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+++ b/kdesu/process.cpp
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+/* vi: ts=8 sts=4 sw=4
+ *
+ * $Id$
+ *
+ * This file is part of the KDE project, module kdesu.
+ * 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/ioctl.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 <qglobal.h>
+#include <qcstring.h>
+#include <qfile.h>
+
+#include <kconfig.h>
+#include <kdebug.h>
+#include <kstandarddirs.h>
+
+#include "process.h"
+#include "kdesu_pty.h"
+#include "kcookie.h"
+
+int PtyProcess::waitMS(int fd,int ms)
+{
+ struct timeval tv;
+ tv.tv_sec = 0;
+ tv.tv_usec = 1000*ms;
+
+ fd_set fds;
+ FD_ZERO(&fds);
+ FD_SET(fd,&fds);
+ return select(fd+1, &fds, 0L, 0L, &tv);
+}
+
+/*
+** Basic check for the existence of @p pid.
+** Returns true iff @p pid is an extant process.
+*/
+bool PtyProcess::checkPid(pid_t pid)
+{
+ KConfig* config = KGlobal::config();
+ config->setGroup("super-user-command");
+ QString superUserCommand = config->readEntry("super-user-command", DEFAULT_SUPER_USER_COMMAND);
+ //sudo does not accept signals from user so we except it
+ if (superUserCommand == "sudo") {
+ return true;
+ } else {
+ return kill(pid,0) == 0;
+ }
+}
+
+/*
+** Check process exit status for process @p pid.
+** On error (no child, no exit), return Error (-1).
+** If child @p pid has exited, return its exit status,
+** (which may be zero).
+** If child @p has not exited, return NotExited (-2).
+*/
+
+int PtyProcess::checkPidExited(pid_t pid)
+{
+ int state, ret;
+ ret = waitpid(pid, &state, WNOHANG);
+
+ if (ret < 0)
+ {
+ kdError(900) << k_lineinfo << "waitpid(): " << perror << "\n";
+ return Error;
+ }
+ if (ret == pid)
+ {
+ if (WIFEXITED(state))
+ return WEXITSTATUS(state);
+ return Killed;
+ }
+
+ return NotExited;
+}
+
+
+class PtyProcess::PtyProcessPrivate
+{
+public:
+ QCStringList env;
+};
+
+
+PtyProcess::PtyProcess()
+{
+ m_bTerminal = false;
+ m_bErase = false;
+ m_pPTY = 0L;
+ d = new PtyProcessPrivate;
+}
+
+
+int PtyProcess::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(900) << k_lineinfo << "Master setup failed.\n";
+ m_Fd = -1;
+ return -1;
+ }
+ m_TTY = m_pPTY->ptsname();
+ m_Inbuf.resize(0);
+ return 0;
+}
+
+
+PtyProcess::~PtyProcess()
+{
+ delete m_pPTY;
+ delete d;
+}
+
+/** Set additinal environment variables. */
+void PtyProcess::setEnvironment( const QCStringList &env )
+{
+ d->env = env;
+}
+
+const QCStringList& PtyProcess::environment() const
+{
+ return d->env;
+}
+
+/*
+ * 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.
+ */
+
+QCString PtyProcess::readLine(bool block)
+{
+ int pos;
+ QCString ret;
+
+ if (!m_Inbuf.isEmpty())
+ {
+ pos = m_Inbuf.find('\n');
+ if (pos == -1)
+ {
+ ret = m_Inbuf;
+ m_Inbuf.resize(0);
+ } else
+ {
+ ret = m_Inbuf.left(pos);
+ m_Inbuf = m_Inbuf.mid(pos+1);
+ }
+ return ret;
+ }
+
+ int flags = fcntl(m_Fd, F_GETFL);
+ if (flags < 0)
+ {
+ kdError(900) << k_lineinfo << "fcntl(F_GETFL): " << perror << "\n";
+ return ret;
+ }
+ int oflags = flags;
+ if (block)
+ flags &= ~O_NONBLOCK;
+ else
+ flags |= O_NONBLOCK;
+
+ if ((flags != oflags) && (fcntl(m_Fd, F_SETFL, flags) < 0))
+ {
+ // We get an error here when the child process has closed
+ // the file descriptor already.
+ return ret;
+ }
+
+ int nbytes;
+ char buf[256];
+ while (1)
+ {
+ nbytes = read(m_Fd, buf, 255);
+ if (nbytes == -1)
+ {
+ if (errno == EINTR)
+ continue;
+ else break;
+ }
+ if (nbytes == 0)
+ break; // eof
+
+ buf[nbytes] = '\000';
+ m_Inbuf += buf;
+
+ pos = m_Inbuf.find('\n');
+ if (pos == -1)
+ {
+ ret = m_Inbuf;
+ m_Inbuf.resize(0);
+ } else
+ {
+ ret = m_Inbuf.left(pos);
+ m_Inbuf = m_Inbuf.mid(pos+1);
+ }
+ break;
+ }
+
+ return ret;
+}
+
+QCString PtyProcess::readAll(bool block)
+{
+ QCString ret;
+
+ if (!m_Inbuf.isEmpty())
+ {
+ // if there is still something in the buffer, we need not block.
+ // we should still try to read any further output, from the fd, though.
+ block = false;
+ ret = m_Inbuf;
+ m_Inbuf.resize(0);
+ }
+
+ int flags = fcntl(m_Fd, F_GETFL);
+ if (flags < 0)
+ {
+ kdError(900) << k_lineinfo << "fcntl(F_GETFL): " << perror << "\n";
+ return ret;
+ }
+ int oflags = flags;
+ if (block)
+ flags &= ~O_NONBLOCK;
+ else
+ flags |= O_NONBLOCK;
+
+ if ((flags != oflags) && (fcntl(m_Fd, F_SETFL, flags) < 0))
+ {
+ // We get an error here when the child process has closed
+ // the file descriptor already.
+ return ret;
+ }
+
+ int nbytes;
+ char buf[256];
+ while (1)
+ {
+ nbytes = read(m_Fd, buf, 255);
+ if (nbytes == -1)
+ {
+ if (errno == EINTR)
+ continue;
+ else break;
+ }
+ if (nbytes == 0)
+ break; // eof
+
+ buf[nbytes] = '\000';
+ ret += buf;
+ break;
+ }
+
+ return ret;
+}
+
+
+void PtyProcess::writeLine(const QCString &line, bool addnl)
+{
+ if (!line.isEmpty())
+ write(m_Fd, line, line.length());
+ if (addnl)
+ write(m_Fd, "\n", 1);
+}
+
+
+void PtyProcess::unreadLine(const QCString &line, bool addnl)
+{
+ QCString tmp = line;
+ if (addnl)
+ tmp += '\n';
+ if (!tmp.isEmpty())
+ m_Inbuf.prepend(tmp);
+}
+
+/*
+ * Fork and execute the command. This returns in the parent.
+ */
+
+int PtyProcess::exec(const QCString &command, const QCStringList &args)
+{
+ kdDebug(900) << k_lineinfo << "Running `" << command << "'\n";
+
+ if (init() < 0)
+ return -1;
+
+ // Open the pty slave before forking. See SetupTTY()
+ int slave = open(m_TTY, O_RDWR);
+ if (slave < 0)
+ {
+ kdError(900) << k_lineinfo << "Could not open slave pty.\n";
+ return -1;
+ }
+
+ if ((m_Pid = fork()) == -1)
+ {
+ kdError(900) << k_lineinfo << "fork(): " << perror << "\n";
+ return -1;
+ }
+
+ // Parent
+ if (m_Pid)
+ {
+ close(slave);
+ return 0;
+ }
+
+ // Child
+ if (SetupTTY(slave) < 0)
+ _exit(1);
+
+ for(QCStringList::ConstIterator it = d->env.begin();
+ it != d->env.end(); it++)
+ {
+ putenv((*it).data());
+ }
+ unsetenv("KDE_FULL_SESSION");
+
+ // set temporarily LC_ALL to C, for su (to be able to parse "Password:")
+ const char* old_lc_all = getenv( "LC_ALL" );
+ if( old_lc_all != NULL )
+ setenv( "KDESU_LC_ALL", old_lc_all, 1 );
+ else
+ unsetenv( "KDESU_LC_ALL" );
+ setenv("LC_ALL", "C", 1);
+
+ // From now on, terminal output goes through the tty.
+
+ QCString path;
+ if (command.contains('/'))
+ path = command;
+ else
+ {
+ QString file = KStandardDirs::findExe(command);
+ if (file.isEmpty())
+ {
+ kdError(900) << k_lineinfo << command << " not found\n";
+ _exit(1);
+ }
+ path = QFile::encodeName(file);
+ }
+
+ const char **argp = (const char **)malloc((args.count()+2)*sizeof(char *));
+ int i = 0;
+ argp[i++] = path;
+ for (QCStringList::ConstIterator it=args.begin(); it!=args.end(); ++it)
+ argp[i++] = *it;
+
+ argp[i] = 0L;
+
+ execv(path, (char * const *)argp);
+ kdError(900) << 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 PtyProcess::WaitSlave()
+{
+ int slave = open(m_TTY, O_RDWR);
+ if (slave < 0)
+ {
+ kdError(900) << k_lineinfo << "Could not open slave tty.\n";
+ return -1;
+ }
+
+ kdDebug(900) << k_lineinfo << "Child pid " << m_Pid << endl;
+
+ struct termios tio;
+ while (1)
+ {
+ if (!checkPid(m_Pid))
+ {
+ close(slave);
+ return -1;
+ }
+ if (tcgetattr(slave, &tio) < 0)
+ {
+ kdError(900) << k_lineinfo << "tcgetattr(): " << perror << "\n";
+ close(slave);
+ return -1;
+ }
+ if (tio.c_lflag & ECHO)
+ {
+ kdDebug(900) << k_lineinfo << "Echo mode still on.\n";
+ waitMS(slave,100);
+ continue;
+ }
+ break;
+ }
+ close(slave);
+ return 0;
+}
+
+
+int PtyProcess::enableLocalEcho(bool enable)
+{
+ int slave = open(m_TTY, O_RDWR);
+ if (slave < 0)
+ {
+ kdError(900) << k_lineinfo << "Could not open slave tty.\n";
+ return -1;
+ }
+ struct termios tio;
+ if (tcgetattr(slave, &tio) < 0)
+ {
+ kdError(900) << 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(900) << 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 PtyProcess::waitForChild()
+{
+ int retval = 1;
+
+ fd_set fds;
+ FD_ZERO(&fds);
+
+ while (1)
+ {
+ FD_SET(m_Fd, &fds);
+ int ret = select(m_Fd+1, &fds, 0L, 0L, 0L);
+ if (ret == -1)
+ {
+ if (errno != EINTR)
+ {
+ kdError(900) << k_lineinfo << "select(): " << perror << "\n";
+ return -1;
+ }
+ ret = 0;
+ }
+
+ if (ret)
+ {
+ QCString output = readAll(false);
+ bool lineStart = true;
+ while (!output.isNull())
+ {
+ if (!m_Exit.isEmpty())
+ {
+ // match exit string only at line starts
+ int pos = output.find(m_Exit);
+ if ((pos >= 0) && ((pos == 0 && lineStart) || (output.at (pos - 1) == '\n')))
+ {
+ kill(m_Pid, SIGTERM);
+ }
+ }
+ if (m_bTerminal)
+ {
+ fputs(output, stdout);
+ fflush(stdout);
+ }
+ lineStart = output.at( output.length() - 1 ) == '\n';
+ output = readAll(false);
+ }
+ }
+
+ ret = checkPidExited(m_Pid);
+ if (ret == Error)
+ {
+ if (errno == ECHILD) retval = 0;
+ else retval = 1;
+ break;
+ }
+ else if (ret == Killed)
+ {
+ retval = 0;
+ break;
+ }
+ else if (ret == NotExited)
+ {
+ // keep checking
+ }
+ else
+ {
+ retval = ret;
+ 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 PtyProcess::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(900) << 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
+
+#ifdef TIOCSCTTY
+ ioctl(slave, TIOCSCTTY, NULL);
+#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(0, &tio) < 0)
+ {
+ kdError(900) << k_lineinfo << "tcgetattr(): " << perror << "\n";
+ return -1;
+ }
+ tio.c_oflag &= ~OPOST;
+ if (tcsetattr(0, TCSANOW, &tio) < 0)
+ {
+ kdError(900) << k_lineinfo << "tcsetattr(): " << perror << "\n";
+ return -1;
+ }
+
+ return 0;
+}
+
+void PtyProcess::virtual_hook( int, void* )
+{ /*BASE::virtual_hook( id, data );*/ }
generated by cgit v1.2.1 (git 2.18.0) at 2024-11-05 08:45:13 +0000