icinga2/lib/compat/externalcommandlistener.cpp

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/******************************************************************************
* Icinga 2 *
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* Copyright (C) 2012-2015 Icinga Development Team (http://www.icinga.org) *
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* *
* 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 St, Fifth Floor, Boston, MA 02110-1301, USA. *
******************************************************************************/
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#include "compat/externalcommandlistener.hpp"
#include "icinga/externalcommandprocessor.hpp"
#include "base/dynamictype.hpp"
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#include "base/logger.hpp"
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#include "base/exception.hpp"
#include "base/application.hpp"
#include "base/statsfunction.hpp"
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using namespace icinga;
REGISTER_TYPE(ExternalCommandListener);
REGISTER_STATSFUNCTION(ExternalCommandListenerStats, &ExternalCommandListener::StatsFunc);
void ExternalCommandListener::StatsFunc(const Dictionary::Ptr& status, const Array::Ptr&)
{
Dictionary::Ptr nodes = new Dictionary();
BOOST_FOREACH(const ExternalCommandListener::Ptr& externalcommandlistener, DynamicType::GetObjectsByType<ExternalCommandListener>()) {
nodes->Set(externalcommandlistener->GetName(), 1); //add more stats
}
status->Set("externalcommandlistener", nodes);
}
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/**
* Starts the component.
*/
void ExternalCommandListener::Start(void)
{
DynamicObject::Start();
#ifndef _WIN32
m_CommandThread = boost::thread(boost::bind(&ExternalCommandListener::CommandPipeThread, this, GetCommandPath()));
m_CommandThread.detach();
#endif /* _WIN32 */
}
#ifndef _WIN32
void ExternalCommandListener::CommandPipeThread(const String& commandPath)
{
Utility::SetThreadName("Command Pipe");
struct stat statbuf;
bool fifo_ok = false;
if (lstat(commandPath.CStr(), &statbuf) >= 0) {
if (S_ISFIFO(statbuf.st_mode) && access(commandPath.CStr(), R_OK) >= 0) {
fifo_ok = true;
} else {
if (unlink(commandPath.CStr()) < 0) {
BOOST_THROW_EXCEPTION(posix_error()
<< boost::errinfo_api_function("unlink")
<< boost::errinfo_errno(errno)
<< boost::errinfo_file_name(commandPath));
}
}
}
mode_t mode = S_IRUSR | S_IWUSR | S_IRGRP | S_IWGRP;
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if (!fifo_ok && mkfifo(commandPath.CStr(), S_IRUSR | S_IWUSR | S_IRGRP | S_IWGRP) < 0) {
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Log(LogCritical, "ExternalCommandListener")
<< "mkfifo() for fifo path '" << commandPath << "' failed with error code " << errno << ", \"" << Utility::FormatErrorNumber(errno) << "\"";
return;
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}
/* mkfifo() uses umask to mask off some bits, which means we need to chmod() the
* fifo to get the right mask. */
if (chmod(commandPath.CStr(), mode) < 0) {
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Log(LogCritical, "ExternalCommandListener")
<< "chmod() on fifo '" << commandPath << "' failed with error code " << errno << ", \"" << Utility::FormatErrorNumber(errno) << "\"";
return;
}
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for (;;) {
int fd;
do {
fd = open(commandPath.CStr(), O_RDONLY);
} while (fd < 0 && errno == EINTR);
if (fd < 0) {
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Log(LogCritical, "ExternalCommandListener")
<< "open() for fifo path '" << commandPath << "' failed with error code " << errno << ", \"" << Utility::FormatErrorNumber(errno) << "\"";
return;
}
FILE *fp = fdopen(fd, "r");
if (fp == NULL) {
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Log(LogCritical, "ExternalCommandListener")
<< "fdopen() for fifo path '" << commandPath << "' failed with error code " << errno << ", \"" << Utility::FormatErrorNumber(errno) << "\"";
return;
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}
const int linesize = 128 * 1024;
char *line = new char[linesize];
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while (fgets(line, linesize, fp) != NULL) {
// remove trailing new-line
while (strlen(line) > 0 &&
(line[strlen(line) - 1] == '\r' || line[strlen(line) - 1] == '\n'))
line[strlen(line) - 1] = '\0';
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String command = line;
try {
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Log(LogInformation, "ExternalCommandListener")
<< "Executing external command: " << command;
ExternalCommandProcessor::Execute(command);
} catch (const std::exception& ex) {
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Log(LogWarning, "ExternalCommandListener")
<< "External command failed." << DiagnosticInformation(ex);
}
}
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delete [] line;
fclose(fp);
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}
}
#endif /* _WIN32 */