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
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
|
/**
* @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";
}
int 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 NOTHING;
} else
#endif
if (time(nullptr) > startTime + IDLE_TIMEOUT)
{
bincClient << "* BYE Timeout after " << IDLE_TIMEOUT << " seconds of inactivity."
<< endl;
session.setState(Session::LOGOUT);
return 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 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 OK;
}
Operator::ParseResult IdleOperator::parse(Request &c_in) const
{
Session &session = Session::getInstance();
if (c_in.getUidMode()) return REJECT;
Operator::ParseResult res;
if ((res = expectCRLF()) != ACCEPT) {
session.setLastError("Expected CRLF after IDLE");
return res;
}
c_in.setName("IDLE");
return ACCEPT;
}
|
