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
|
/* Copyright (c) 2013 Dovecot authors, see the included COPYING file */
#include "lib.h"
#include "llist.h"
#include "istream.h"
#include "ostream.h"
#include "strescape.h"
#include "master-service.h"
#include "replicator-queue.h"
#include "notify-connection.h"
#include <unistd.h>
#define MAX_INBUF_SIZE (1024*64)
#define NOTIFY_CLIENT_PROTOCOL_MAJOR_VERSION 1
#define NOTIFY_CLIENT_PROTOCOL_MINOR_VERSION 0
struct notify_connection {
struct notify_connection *prev, *next;
int refcount;
int fd;
struct io *io;
struct istream *input;
struct ostream *output;
struct replicator_queue *queue;
unsigned int version_received:1;
unsigned int destroyed:1;
};
struct notify_sync_request {
struct notify_connection *conn;
unsigned int id;
};
static struct notify_connection *connections;
static void notify_connection_destroy(struct notify_connection *conn);
static void notify_sync_callback(bool success, void *context)
{
struct notify_sync_request *request = context;
o_stream_nsend_str(request->conn->output, t_strdup_printf(
"%c\t%u\n", success ? '+' : '-', request->id));
notify_connection_unref(&request->conn);
i_free(request);
}
static int
notify_connection_input_line(struct notify_connection *conn, const char *line)
{
struct notify_sync_request *request;
const char *const *args;
enum replication_priority priority;
unsigned int id;
/* U \t <username> \t <priority> [\t <sync id>] */
args = t_strsplit_tabescaped(line);
if (str_array_length(args) < 2) {
i_error("notify client sent invalid input: %s", line);
return -1;
}
if (strcmp(args[0], "U") != 0) {
i_error("notify client sent unknown command: %s", args[0]);
return -1;
}
if (replication_priority_parse(args[2], &priority) < 0) {
i_error("notify client sent invalid priority: %s", args[2]);
return -1;
}
if (priority != REPLICATION_PRIORITY_SYNC)
(void)replicator_queue_add(conn->queue, args[1], priority);
else if (args[3] == NULL || str_to_uint(args[3], &id) < 0) {
i_error("notify client sent invalid sync id: %s", line);
return -1;
} else {
request = i_new(struct notify_sync_request, 1);
request->conn = conn;
request->id = id;
notify_connection_ref(conn);
replicator_queue_add_sync(conn->queue, args[1],
notify_sync_callback, request);
}
return 0;
}
static void notify_connection_input(struct notify_connection *conn)
{
const char *line;
int ret;
switch (i_stream_read(conn->input)) {
case -2:
i_error("BUG: Client connection sent too much data");
notify_connection_destroy(conn);
return;
case -1:
notify_connection_destroy(conn);
return;
}
if (!conn->version_received) {
if ((line = i_stream_next_line(conn->input)) == NULL)
return;
if (!version_string_verify(line, "replicator-notify",
NOTIFY_CLIENT_PROTOCOL_MAJOR_VERSION)) {
i_error("Notify client not compatible with this server "
"(mixed old and new binaries?)");
notify_connection_destroy(conn);
return;
}
conn->version_received = TRUE;
}
while ((line = i_stream_next_line(conn->input)) != NULL) {
T_BEGIN {
ret = notify_connection_input_line(conn, line);
} T_END;
if (ret < 0) {
notify_connection_destroy(conn);
break;
}
}
}
struct notify_connection *
notify_connection_create(int fd, struct replicator_queue *queue)
{
struct notify_connection *conn;
i_assert(fd >= 0);
conn = i_new(struct notify_connection, 1);
conn->refcount = 1;
conn->queue = queue;
conn->fd = fd;
conn->input = i_stream_create_fd(fd, MAX_INBUF_SIZE, FALSE);
conn->output = o_stream_create_fd(fd, (size_t)-1, FALSE);
o_stream_set_no_error_handling(conn->output, TRUE);
conn->io = io_add(fd, IO_READ, notify_connection_input, conn);
conn->queue = queue;
DLLIST_PREPEND(&connections, conn);
return conn;
}
static void notify_connection_destroy(struct notify_connection *conn)
{
if (conn->destroyed)
return;
conn->destroyed = TRUE;
DLLIST_REMOVE(&connections, conn);
io_remove(&conn->io);
i_stream_close(conn->input);
o_stream_close(conn->output);
if (close(conn->fd) < 0)
i_error("close(notify connection) failed: %m");
conn->fd = -1;
notify_connection_unref(&conn);
master_service_client_connection_destroyed(master_service);
}
void notify_connection_ref(struct notify_connection *conn)
{
i_assert(conn->refcount > 0);
conn->refcount++;
}
void notify_connection_unref(struct notify_connection **_conn)
{
struct notify_connection *conn = *_conn;
i_assert(conn->refcount > 0);
*_conn = NULL;
if (--conn->refcount > 0)
return;
notify_connection_destroy(conn);
i_stream_unref(&conn->input);
o_stream_unref(&conn->output);
i_free(conn);
}
void notify_connections_destroy_all(void)
{
while (connections != NULL)
notify_connection_destroy(connections);
}
|