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/**
* @file operator-idle.cc
* @brief Operator for the IDLE command. Described in RFC2177 / June 1997.
* @author Andreas Aardal Hanssen
* @date 2002-2005
*/
#include "convert.h"
#include "depot.h"
#include "globals.h"
#include "iodevice.h"
#include "iofactory.h"
#include "mailbox.h"
#include "operators.h"
#include "pendingupdates.h"
#include "recursivedescent.h"
#include "session.h"
#include <iostream>
#include <string>
#include <unistd.h>
static bool directoryChangeNotification = false;
#ifdef HAVE_FNOTIFY // GNU dependencies removed
#include <signal.h>
#include <stdio.h>
#include <fcntl.h>
#include <sys/select.h>
#include <sys/types.h>
void fnotifyEventHandler(int sig)
{
directoryChangeNotification = true;
}
#endif
using namespace Binc;
using std::endl;
// Seconds between each poll. With FNOTIFY support, we can idle for 30
// minutes before timing out.
#ifdef HAVE_FNOTIFY
static const int POLLTIMEOUT = 30 * 60;
#else
static const int POLLTIMEOUT = 30;
#endif
IdleOperator::IdleOperator() {}
IdleOperator::~IdleOperator() {}
const std::string IdleOperator::getName() const
{
return "IDLE";
}
Session::State IdleOperator::getState() const
{
return Session::SELECTED;
}
Operator::ProcessResult IdleOperator::process(Depot &depot, Request &command)
{
Mailbox *mailbox = depot.getSelected();
std::string mailboxDir = depot.mailboxToFilename(mailbox->getName());
#ifdef HAVE_FNOTIFY
// Check for FNOTIFY support.
bool waitForNotification = false;
int newfd = open((mailboxDir + "/new").c_str(), O_RDONLY);
int curfd = open((mailboxDir + "/cur").c_str(), O_RDONLY);
// Watch for notifications for renames, deletes or creates.
if (newfd && curfd && !fcntl(newfd, F_NOTIFY, DN_RENAME | DN_DELETE | DN_CREATE)
&& !fcntl(curfd, F_NOTIFY, DN_RENAME | DN_DELETE | DN_CREATE))
{
struct sigaction fnotifyAction;
fnotifyAction.sa_handler = fnotifyEventHandler;
sigemptyset(&fnotifyAction.sa_mask);
fnotifyAction.sa_flags = SA_RESTART;
sigaction(SIGUSR1, &fnotifyAction, 0);
fcntl(newfd, F_SETSIG, SIGUSR1);
fcntl(curfd, F_SETSIG, SIGUSR1);
waitForNotification = true;
}
#endif
// when not using FNOTIFY, we need to check the session timeout.
time_t startTime = time(nullptr);
#ifdef HAVE_FNOTIFY
()startTime; // removes a compile warning
#endif
bincClient << "+ idling" << endl;
bincClient.flush();
// loop until the session times out or the client submits DONE.
for (;;) {
int maxfd = 0;
fd_set readfds;
FD_ZERO(&readfds);
FD_SET(0, &readfds);
// check for data from stdin. with FNOTIFY enabled, this select
// will be interrupted by the notification signal.
std::string input;
struct timeval tv = {POLLTIMEOUT, 0};
int ret = select(maxfd + 1, &readfds, nullptr, nullptr, &tv);
// check if the select timed out.
if (ret == 0) {
Session &session = Session::getInstance();
#ifdef HAVE_FNOTIFY
if (waitForNotification) {
bincClient << "* BYE Timeout after " << session.timeout() << " seconds of inactivity."
<< endl;
session.setState(Session::LOGOUT);
close(newfd);
close(curfd);
return Operator::ProcessResult::NOTHING;
} else
#endif
if (time(nullptr) > startTime + IDLE_TIMEOUT)
{
bincClient << "* BYE Timeout after " << IDLE_TIMEOUT << " seconds of inactivity."
<< endl;
session.setState(Session::LOGOUT);
return Operator::ProcessResult::NOTHING;
}
}
// unless the select failed, attempt to read client input.
if (ret > 0 && FD_ISSET(0, &readfds)) {
if (bincClient.readStr(&input) == false) {
break;
} else {
uppercase(input);
trim(input);
if (input == "DONE") {
break;
} else {
bincClient << "* BAD Syntax error: \"" << input << "\"" << endl;
bincClient.flush();
continue;
}
}
}
// at this point, we either got a directory change notification,
// or the select simply timed out, in which case we poll.
bool scanForChanges = false;
#ifdef HAVE_FNOTIFY
if (directoryChangeNotification)
scanForChanges = true;
else if (!waitForNotification)
#endif
scanForChanges = true;
if (scanForChanges) {
if (directoryChangeNotification) {
// sleep the magic 1 second to ensure that anything that
// arrived in new/ the last second isn't skipped by
// pendingUpdates' scan.
sleep(1);
}
// scan for changes in the mailbox and report to the client.
if (!pendingUpdates(mailbox,
PendingUpdates::EXPUNGE | PendingUpdates::EXISTS
| PendingUpdates::RECENT | PendingUpdates::FLAGS,
true))
{
Session &session = Session::getInstance();
bincClient << "* NO " << session.getLastError() << endl;
bincWarning << "when scanning mailbox: " << session.getLastError() << endl;
#ifdef HAVE_FNOTIFY
close(newfd);
close(curfd);
#endif
return Operator::ProcessResult::NO;
}
#ifdef HAVE_FNOTIFY
// if FNOTIFY is enabled, set it up again.
if (waitForNotification) {
directoryChangeNotification = false;
// set up F_NOTIFY again.
if (!fcntl(newfd, F_NOTIFY, DN_MODIFY | DN_RENAME | DN_DELETE | DN_CREATE)
&& !fcntl(curfd, F_NOTIFY, DN_MODIFY | DN_RENAME | DN_DELETE | DN_CREATE))
{
struct sigaction fnotifyAction;
fnotifyAction.sa_handler = fnotifyEventHandler;
sigemptyset(&fnotifyAction.sa_mask);
fnotifyAction.sa_flags = SA_RESTART;
sigaction(SIGUSR1, &fnotifyAction, 0);
} else {
waitForNotification = false;
}
}
#endif
bincClient.flush();
}
}
#ifdef HAVE_FNOTIFY
close(newfd);
close(curfd);
#endif
return Operator::ProcessResult::OK;
}
Parser::ParseResult IdleOperator::parse(Request &c_in)
{
Session &session = Session::getInstance();
if (c_in.getUidMode()) return Parser::ParseResult::REJECT;
Parser::ParseResult res;
if ((res = expectCRLF()) != Parser::ParseResult::ACCEPT) {
session.setLastError("Expected CRLF after IDLE");
return res;
}
c_in.setName("IDLE");
return Parser::ParseResult::ACCEPT;
}
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