summaryrefslogtreecommitdiffstats
path: root/kalarm/lib/shellprocess.cpp
blob: 09daf91dbbeed9084008f9b7dd697a7da58a50e5 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
/*
 *  shellprocess.cpp  -  execute a shell process
 *  Program:  kalarm
 *  Copyright (c) 2004, 2005 by David Jarvie <software@astrojar.org.uk>
 *
 *  This program is free software; you can redistribute it and/or modify
 *  it under the terms of the GNU General Public License as published by
 *  the Free Software Foundation; either version 2 of the License, or
 *  (at your option) any later version.
 *
 *  This program 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 General Public License for more details.
 *
 *  You should have received a copy of the GNU General Public License along
 *  with this program; if not, write to the Free Software Foundation, Inc.,
 *  51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
 */

#ifdef HAVE_CONFIG_H
#include <config.h>
#endif

#include <stdlib.h>
#include <sys/stat.h>
#include <kapplication.h>
#include <klocale.h>
#include <kdebug.h>

#include "shellprocess.moc"


TQCString  ShellProcess::mShellName;
TQCString  ShellProcess::mShellPath;
bool      ShellProcess::mInitialised = false;
bool      ShellProcess::mAuthorised  = false;


ShellProcess::ShellProcess(const TQString& command)
	: KShellProcess(shellName()),
	  mCommand(command),
	  mtqStatus(INACTIVE),
	  mStdinExit(false)
{
}

/******************************************************************************
* Execute a command.
*/
bool ShellProcess::start(Communication comm)
{
	if (!authorised())
	{
		mtqStatus = UNAUTHORISED;
		return false;
	}
	KShellProcess::operator<<(mCommand);
	connect(this, TQT_SIGNAL(wroteStdin(KProcess*)), TQT_SLOT(writtenStdin(KProcess*)));
	connect(this, TQT_SIGNAL(processExited(KProcess*)), TQT_SLOT(slotExited(KProcess*)));
	if (!KShellProcess::start(KProcess::NotifyOnExit, comm))
	{
		mtqStatus = START_FAIL;
		return false;
	}
	mtqStatus = RUNNING;
	return true;
}

/******************************************************************************
* Called when a shell process execution completes.
* Interprets the exit status according to which shell was called, and emits
* a shellExited() signal.
*/
void ShellProcess::slotExited(KProcess* proc)
{
	kdDebug(5950) << "ShellProcess::slotExited()\n";
	mStdinQueue.clear();
	mtqStatus = SUCCESS;
	if (!proc->normalExit())
	{
		kdWarning(5950) << "ShellProcess::slotExited(" << mCommand << ") " << mShellName << ": died/killed\n";
		mtqStatus = DIED;
	}
	else
	{
		// Some shells report if the command couldn't be found, or is not executable
		int status = proc->exitStatus();
		if (mShellName == "bash"  &&  (status == 126 || status == 127)
		||  mShellName == "ksh"  &&  status == 127)
		{
			kdWarning(5950) << "ShellProcess::slotExited(" << mCommand << ") " << mShellName << ": not found or not executable\n";
			mtqStatus = NOT_FOUND;
		}
	}
	emit shellExited(this);
}

/******************************************************************************
* Write a string to STDIN.
*/
void ShellProcess::writeStdin(const char* buffer, int bufflen)
{
	TQCString scopy(buffer, bufflen+1);    // construct a deep copy
	bool write = mStdinQueue.isEmpty();
	mStdinQueue.append(scopy);
	if (write)
		KProcess::writeStdin(mStdinQueue.first(), mStdinQueue.first().length());
}

/******************************************************************************
* Called when output to STDIN completes.
* Send the next queued output, if any.
* Note that buffers written to STDIN must not be freed until the writtenStdin()
* signal has been processed.
*/
void ShellProcess::writtenStdin(KProcess* proc)
{
	mStdinQueue.pop_front();   // free the buffer which has now been written
	if (!mStdinQueue.isEmpty())
		proc->writeStdin(mStdinQueue.first(), mStdinQueue.first().length());
	else if (mStdinExit)
		kill();
}

/******************************************************************************
* Tell the process to exit once all STDIN strings have been written.
*/
void ShellProcess::stdinExit()
{
	if (mStdinQueue.isEmpty())
		kill();
	else
		mStdinExit = true;
}

/******************************************************************************
* Return the error message corresponding to the command exit status.
* Reply = null string if not yet exited, or if command successful.
*/
TQString ShellProcess::errorMessage() const
{
	switch (mtqStatus)
	{
		case UNAUTHORISED:
			return i18n("Failed to execute command (shell access not authorized):");
		case START_FAIL:
		case NOT_FOUND:
			return i18n("Failed to execute command:");
		case DIED:
			return i18n("Command execution error:");
		case INACTIVE:
		case RUNNING:
		case SUCCESS:
		default:
			return TQString();
	}
}

/******************************************************************************
* Determine which shell to use.
* This is a duplication of what KShellProcess does, but we need to know
* which shell is used in order to decide what its exit code means.
*/
const TQCString& ShellProcess::shellPath()
{
	if (mShellPath.isEmpty())
	{
		// Get the path to the shell
		mShellPath = "/bin/sh";
		TQCString envshell = TQCString(getenv("SHELL")).stripWhiteSpace();
		if (!envshell.isEmpty())
		{
			struct stat fileinfo;
			if (stat(envshell.data(), &fileinfo) != -1  // ensure file exists
			&&  !S_ISDIR(fileinfo.st_mode)              // and it's not a directory
			&&  !S_ISCHR(fileinfo.st_mode)              // and it's not a character tqdevice
			&&  !S_ISBLK(fileinfo.st_mode)              // and it's not a block tqdevice
#ifdef S_ISSOCK
			&&  !S_ISSOCK(fileinfo.st_mode)             // and it's not a socket
#endif
			&&  !S_ISFIFO(fileinfo.st_mode)             // and it's not a fifo
			&&  !access(envshell.data(), X_OK))         // and it's executable
				mShellPath = envshell;
		}

		// Get the shell filename with the path stripped off
		int i = mShellPath.findRev('/');
		if (i >= 0)
			mShellName = mShellPath.mid(i + 1);
		else
			mShellName = mShellPath;
	}
	return mShellPath;
}

/******************************************************************************
* Check whether shell commands are allowed at all.
*/
bool ShellProcess::authorised()
{
	if (!mInitialised)
	{
		mAuthorised = kapp->authorize("shell_access");
		mInitialised = true;
	}
	return mAuthorised;
}