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/* Copyright (c) 2013-2018 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;
bool version_received:1;
bool 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);
conn->output = o_stream_create_fd(fd, SIZE_MAX);
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);
}
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