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/* Copyright (c) 2011-2018 Dovecot authors, see the included COPYING file */
#include "lib.h"
#include "llist.h"
#include "ioloop.h"
#include "istream.h"
#include "ostream.h"
#include "strescape.h"
#include "master-service.h"
#include "mail-command.h"
#include "mail-session.h"
#include "mail-user.h"
#include "mail-domain.h"
#include "mail-ip.h"
#include "client-export.h"
#include "client-reset.h"
#include "client.h"
#include <unistd.h>
#define CLIENT_MAX_SIMULTANEOUS_ITER_COUNT 1000
#define MAX_INBUF_SIZE 1024
#define OUTBUF_THROTTLE_SIZE (1024*64)
static struct client *clients;
bool client_is_busy(struct client *client)
{
client->iter_count++;
if (client->iter_count % CLIENT_MAX_SIMULTANEOUS_ITER_COUNT == 0)
return TRUE;
if (o_stream_get_buffer_used_size(client->output) < OUTBUF_THROTTLE_SIZE)
return FALSE;
if (o_stream_flush(client->output) < 0)
return TRUE;
return o_stream_get_buffer_used_size(client->output) >= OUTBUF_THROTTLE_SIZE;
}
static int
client_handle_request(struct client *client, const char *const *args,
const char **error_r)
{
const char *cmd = args[0];
if (cmd == NULL) {
*error_r = "Missing command";
return -1;
}
args++;
if (strcmp(cmd, "EXPORT") == 0)
return client_export(client, args, error_r);
if (strcmp(cmd, "RESET") == 0)
return client_stats_reset(client, args, error_r);
*error_r = "Unknown command";
return -1;
}
static const char *const*
client_read_next_line(struct client *client)
{
const char *line;
line = i_stream_next_line(client->input);
if (line == NULL)
return NULL;
return t_strsplit_tabescaped(line);
}
static void client_input(struct client *client)
{
const char *const *args, *error;
int ret;
timeout_remove(&client->to_pending);
switch (i_stream_read(client->input)) {
case -2:
i_error("BUG: Stats client sent too much data");
client_destroy(&client);
return;
case -1:
client_destroy(&client);
return;
}
o_stream_cork(client->output);
while ((args = client_read_next_line(client)) != NULL) {
ret = client_handle_request(client, args, &error);
if (ret < 0) {
i_error("Stats client input error: %s", error);
client_destroy(&client);
return;
}
if (ret == 0) {
o_stream_set_flush_pending(client->output, TRUE);
io_remove(&client->io);
break;
}
client->cmd_more = NULL;
}
o_stream_uncork(client->output);
}
static int client_output(struct client *client)
{
int ret = 1;
if (o_stream_flush(client->output) < 0) {
client_destroy(&client);
return 1;
}
if (client->cmd_more != NULL)
ret = client->cmd_more(client);
if (ret > 0) {
client->cmd_more = NULL;
if (client->io == NULL)
client_enable_io(client);
}
return ret;
}
void client_enable_io(struct client *client)
{
i_assert(client->io == NULL);
client->io = io_add(client->fd, IO_READ, client_input, client);
if (client->to_pending == NULL)
client->to_pending = timeout_add(0, client_input, client);
}
struct client *client_create(int fd)
{
struct client *client;
client = i_new(struct client, 1);
client->fd = fd;
client->io = io_add(fd, IO_READ, client_input, client);
client->input = i_stream_create_fd(fd, MAX_INBUF_SIZE);
client->output = o_stream_create_fd(fd, SIZE_MAX);
o_stream_set_no_error_handling(client->output, TRUE);
o_stream_set_flush_callback(client->output, client_output, client);
client->cmd_pool = pool_alloconly_create("cmd pool", 1024);
DLLIST_PREPEND(&clients, client);
return client;
}
static void client_unref_iters(struct client *client)
{
if (client->mail_cmd_iter != NULL)
mail_command_unref(&client->mail_cmd_iter);
if (client->mail_session_iter != NULL)
mail_session_unref(&client->mail_session_iter);
if (client->mail_user_iter != NULL)
mail_user_unref(&client->mail_user_iter);
if (client->mail_domain_iter != NULL)
mail_domain_unref(&client->mail_domain_iter);
if (client->mail_ip_iter != NULL)
mail_ip_unref(&client->mail_ip_iter);
}
void client_destroy(struct client **_client)
{
struct client *client = *_client;
*_client = NULL;
DLLIST_REMOVE(&clients, client);
io_remove(&client->io);
i_stream_destroy(&client->input);
o_stream_destroy(&client->output);
if (close(client->fd) < 0)
i_error("close(client) failed: %m");
client_unref_iters(client);
pool_unref(&client->cmd_pool);
i_free(client);
master_service_client_connection_destroyed(master_service);
}
void clients_destroy_all(void)
{
while (clients != NULL) {
struct client *client = clients;
client_destroy(&client);
}
}
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