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imap-client.c
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imap-client.c
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/* Copyright (c) 2002-2017 Dovecot authors, see the included COPYING file */
#include "imap-common.h"
#include "ioloop.h"
#include "llist.h"
#include "str.h"
#include "hostpid.h"
#include "net.h"
#include "iostream.h"
#include "iostream-rawlog.h"
#include "istream.h"
#include "ostream.h"
#include "time-util.h"
#include "var-expand.h"
#include "master-service.h"
#include "imap-resp-code.h"
#include "imap-util.h"
#include "imap-urlauth.h"
#include "mail-error.h"
#include "mail-namespace.h"
#include "mail-storage-service.h"
#include "mail-autoexpunge.h"
#include "imap-state.h"
#include "imap-search.h"
#include "imap-notify.h"
#include "imap-commands.h"
#include <unistd.h>
/* If the last command took longer than this to run, log statistics on
where the time was spent. */
#define IMAP_CLIENT_DISCONNECT_LOG_STATS_CMD_MIN_RUNNING_MSECS 1000
extern struct mail_storage_callbacks mail_storage_callbacks;
extern struct imap_client_vfuncs imap_client_vfuncs;
struct imap_module_register imap_module_register = { 0 };
struct client *imap_clients = NULL;
unsigned int imap_client_count = 0;
static const char *client_command_state_names[CLIENT_COMMAND_STATE_DONE+1] = {
"wait-input",
"wait-output",
"wait-external",
"wait-unambiguity",
"wait-sync",
"done"
};
static void client_idle_timeout(struct client *client)
{
if (client->output_cmd_lock == NULL)
client_send_line(client, "* BYE Disconnected for inactivity.");
client_destroy(client, "Disconnected for inactivity");
}
static void client_init_urlauth(struct client *client)
{
struct imap_urlauth_config config;
i_zero(&config);
config.url_host = client->set->imap_urlauth_host;
config.url_port = client->set->imap_urlauth_port;
config.socket_path = t_strconcat(client->user->set->base_dir,
"/"IMAP_URLAUTH_SOCKET_NAME, NULL);
config.session_id = client->session_id;
config.access_anonymous = client->user->anonymous;
config.access_user = client->user->username;
client->urlauth_ctx = imap_urlauth_init(client->user, &config);
}
static bool user_has_special_use_mailboxes(struct mail_user *user)
{
struct mail_namespace *ns;
for (ns = user->namespaces; ns != NULL; ns = ns->next) {
if (ns->special_use_mailboxes)
return TRUE;
}
return FALSE;
}
struct client *client_create(int fd_in, int fd_out, const char *session_id,
struct mail_user *user,
struct mail_storage_service_user *service_user,
const struct imap_settings *set,
const struct lda_settings *lda_set)
{
const struct mail_storage_settings *mail_set;
struct client *client;
const char *ident;
pool_t pool;
/* always use nonblocking I/O */
net_set_nonblock(fd_in, TRUE);
net_set_nonblock(fd_out, TRUE);
pool = pool_alloconly_create("imap client", 2048);
client = p_new(pool, struct client, 1);
client->pool = pool;
client->v = imap_client_vfuncs;
client->set = set;
client->lda_set = lda_set;
client->service_user = service_user;
client->session_id = p_strdup(pool, session_id);
client->fd_in = fd_in;
client->fd_out = fd_out;
client->input = i_stream_create_fd(fd_in,
set->imap_max_line_length);
client->output = o_stream_create_fd(fd_out, (size_t)-1);
o_stream_set_no_error_handling(client->output, TRUE);
i_stream_set_name(client->input, "<imap client>");
o_stream_set_name(client->output, "<imap client>");
o_stream_set_flush_callback(client->output, client_output, client);
p_array_init(&client->module_contexts, client->pool, 5);
client->io = io_add_istream(client->input, client_input, client);
client->last_input = ioloop_time;
client->to_idle = timeout_add(CLIENT_IDLE_TIMEOUT_MSECS,
client_idle_timeout, client);
client->command_pool =
pool_alloconly_create(MEMPOOL_GROWING"client command", 1024*2);
client->user = user;
client->notify_count_changes = TRUE;
client->notify_flag_changes = TRUE;
if (set->rawlog_dir[0] != '\0') {
(void)iostream_rawlog_create(set->rawlog_dir, &client->input,
&client->output);
}
mail_namespaces_set_storage_callbacks(user->namespaces,
&mail_storage_callbacks, client);
client->capability_string =
str_new(client->pool, sizeof(CAPABILITY_STRING)+64);
if (*set->imap_capability == '\0')
str_append(client->capability_string, CAPABILITY_STRING);
else if (*set->imap_capability != '+') {
str_append(client->capability_string, set->imap_capability);
} else {
str_append(client->capability_string, CAPABILITY_STRING);
str_append_c(client->capability_string, ' ');
str_append(client->capability_string, set->imap_capability + 1);
}
if (client->set->imap_literal_minus)
client_add_capability(client, "LITERAL-");
else
client_add_capability(client, "LITERAL+");
if (user->fuzzy_search) {
/* Enable FUZZY capability only when it actually has
a chance of working */
client_add_capability(client, "SEARCH=FUZZY");
}
mail_set = mail_user_set_get_storage_set(user);
if (mail_set->mailbox_list_index) {
/* NOTIFY is enabled only when mailbox list indexes are
enabled, although even that doesn't necessarily guarantee
it always */
client_add_capability(client, "NOTIFY");
}
if (*set->imap_urlauth_host != '\0' &&
*mail_set->mail_attribute_dict != '\0') {
/* Enable URLAUTH capability only when dict is
configured correctly */
client_init_urlauth(client);
client_add_capability(client, "URLAUTH");
client_add_capability(client, "URLAUTH=BINARY");
}
if (set->imap_metadata && *mail_set->mail_attribute_dict != '\0') {
client->imap_metadata_enabled = TRUE;
client_add_capability(client, "METADATA");
}
if (user_has_special_use_mailboxes(user)) {
/* Advertise SPECIAL-USE only if there are actually some
SPECIAL-USE flags in mailbox configuration. */
client_add_capability(client, "SPECIAL-USE");
}
ident = mail_user_get_anvil_userip_ident(client->user);
if (ident != NULL) {
master_service_anvil_send(master_service, t_strconcat(
"CONNECT\t", my_pid, "\timap/", ident, "\n", NULL));
client->anvil_sent = TRUE;
}
imap_client_count++;
DLLIST_PREPEND(&imap_clients, client);
if (hook_client_created != NULL)
hook_client_created(&client);
imap_refresh_proctitle();
return client;
}
void client_command_cancel(struct client_command_context **_cmd)
{
struct client_command_context *cmd = *_cmd;
bool cmd_ret;
switch (cmd->state) {
case CLIENT_COMMAND_STATE_WAIT_INPUT:
/* a bit kludgy check: cancel command only if it has context
set. currently only append command matches this check. all
other commands haven't even started the processing yet. */
if (cmd->context == NULL)
break;
/* fall through */
case CLIENT_COMMAND_STATE_WAIT_EXTERNAL:
case CLIENT_COMMAND_STATE_WAIT_OUTPUT:
cmd->cancel = TRUE;
break;
case CLIENT_COMMAND_STATE_WAIT_UNAMBIGUITY:
case CLIENT_COMMAND_STATE_WAIT_SYNC:
/* commands haven't started yet */
break;
case CLIENT_COMMAND_STATE_DONE:
i_unreached();
}
cmd_ret = !cmd->cancel || cmd->func == NULL ? TRUE :
command_exec(cmd);
if (!cmd_ret) {
if (cmd->client->output->closed)
i_panic("command didn't cancel itself: %s", cmd->name);
} else {
client_command_free(*_cmd != NULL ? _cmd : &cmd);
}
}
const char *client_stats(struct client *client)
{
const struct var_expand_table tab[] = {
{ 'i', dec2str(i_stream_get_absolute_offset(client->input)), "input" },
{ 'o', dec2str(client->output->offset), "output" },
{ '\0', client->session_id, "session" },
{ '\0', dec2str(client->fetch_hdr_count), "fetch_hdr_count" },
{ '\0', dec2str(client->fetch_hdr_bytes), "fetch_hdr_bytes" },
{ '\0', dec2str(client->fetch_body_count), "fetch_body_count" },
{ '\0', dec2str(client->fetch_body_bytes), "fetch_body_bytes" },
{ '\0', dec2str(client->deleted_count), "deleted" },
{ '\0', dec2str(client->expunged_count), "expunged" },
{ '\0', dec2str(client->trashed_count), "trashed" },
{ '\0', NULL, NULL }
};
string_t *str;
const char *error;
str = t_str_new(128);
if (var_expand(str, client->set->imap_logout_format, tab, &error) <= 0) {
i_error("Failed to expand imap_logout_format=%s: %s",
client->set->imap_logout_format, error);
}
return str_c(str);
}
void client_destroy(struct client *client, const char *reason)
{
client->v.destroy(client, reason);
}
static void
client_command_stats_append(string_t *str,
const struct client_command_stats *stats,
const char *wait_condition,
size_t buffered_size)
{
uint64_t ioloop_wait_usecs;
unsigned int msecs_in_ioloop;
ioloop_wait_usecs = io_loop_get_wait_usecs(current_ioloop);
msecs_in_ioloop = (ioloop_wait_usecs -
stats->start_ioloop_wait_usecs + 999) / 1000;
str_printfa(str, "running for %d.%03d + waiting ",
(int)((stats->running_usecs+999)/1000 / 1000),
(int)((stats->running_usecs+999)/1000 % 1000));
if (wait_condition[0] != '\0')
str_printfa(str, "%s ", wait_condition);
str_printfa(str, "for %d.%03d secs",
msecs_in_ioloop / 1000, msecs_in_ioloop % 1000);
if (stats->lock_wait_usecs > 0) {
int lock_wait_msecs = (stats->lock_wait_usecs+999)/1000;
str_printfa(str, ", %d.%03d in locks",
lock_wait_msecs/1000, lock_wait_msecs%1000);
}
str_printfa(str, ", %llu B in + %llu",
(unsigned long long)stats->bytes_in,
(unsigned long long)stats->bytes_out);
if (buffered_size > 0)
str_printfa(str, "+%"PRIuSIZE_T, buffered_size);
str_append(str, " B out");
}
static const char *client_get_last_command_status(struct client *client)
{
if (client->logged_out)
return "";
if (client->last_cmd_name == NULL)
return " (No commands sent)";
/* client disconnected without sending LOGOUT. if the last command
took over 1 second to run, log it. */
const struct client_command_stats *stats = &client->last_cmd_stats;
string_t *str = t_str_new(128);
int last_run_secs = timeval_diff_msecs(&ioloop_timeval,
&stats->last_run_timeval);
str_printfa(str, " (%s finished %d.%03d secs ago",
client->last_cmd_name, last_run_secs/1000,
last_run_secs%1000);
if (timeval_diff_msecs(&stats->last_run_timeval, &stats->start_time) >=
IMAP_CLIENT_DISCONNECT_LOG_STATS_CMD_MIN_RUNNING_MSECS) {
str_append(str, " - ");
client_command_stats_append(str, stats, "", 0);
}
str_append_c(str, ')');
return str_c(str);
}
static const char *client_get_commands_status(struct client *client)
{
struct client_command_context *cmd, *last_cmd = NULL;
struct client_command_stats all_stats;
string_t *str;
enum io_condition cond;
const char *cond_str;
if (client->command_queue == NULL)
return client_get_last_command_status(client);
i_zero(&all_stats);
str = t_str_new(128);
str_append(str, " (");
for (cmd = client->command_queue; cmd != NULL; cmd = cmd->next) {
if (cmd->name == NULL) {
/* (parts of a) tag were received, but not yet
the command name */
continue;
}
str_append(str, cmd->name);
if (cmd->next != NULL)
str_append_c(str, ',');
all_stats.running_usecs += cmd->stats.running_usecs;
all_stats.lock_wait_usecs += cmd->stats.lock_wait_usecs;
all_stats.bytes_in += cmd->stats.bytes_in;
all_stats.bytes_out += cmd->stats.bytes_out;
last_cmd = cmd;
}
if (last_cmd == NULL)
return client_get_last_command_status(client);
cond = io_loop_find_fd_conditions(current_ioloop, client->fd_out);
if ((cond & (IO_READ | IO_WRITE)) == (IO_READ | IO_WRITE))
cond_str = "input/output";
else if ((cond & IO_READ) != 0)
cond_str = "input";
else if ((cond & IO_WRITE) != 0)
cond_str = "output";
else
cond_str = "nothing";
all_stats.start_ioloop_wait_usecs =
last_cmd->stats.start_ioloop_wait_usecs;
str_append_c(str, ' ');
client_command_stats_append(str, &all_stats, cond_str,
o_stream_get_buffer_used_size(client->output));
str_printfa(str, ", state=%s)",
client_command_state_names[last_cmd->state]);
return str_c(str);
}
static void client_log_disconnect(struct client *client, const char *reason)
{
const char *cmd_status = "";
if (reason == NULL) {
reason = io_stream_get_disconnect_reason(client->input,
client->output);
cmd_status = client_get_commands_status(client);
}
i_info("%s%s %s", reason, cmd_status, client_stats(client));
}
static void client_default_destroy(struct client *client, const char *reason)
{
struct client_command_context *cmd;
i_assert(!client->destroyed);
client->destroyed = TRUE;
if (!client->disconnected) {
client->disconnected = TRUE;
client_log_disconnect(client, reason);
}
i_stream_close(client->input);
o_stream_close(client->output);
/* finish off all the queued commands. */
if (client->output_cmd_lock != NULL)
client_command_cancel(&client->output_cmd_lock);
while (client->command_queue != NULL) {
cmd = client->command_queue;
client_command_cancel(&cmd);
}
/* handle the input_lock command last. it might have been waiting on
other queued commands (although we probably should just drop the
command at that point since it hasn't started running. but this may
change in future). */
if (client->input_lock != NULL)
client_command_cancel(&client->input_lock);
if (client->mailbox != NULL)
imap_client_close_mailbox(client);
if (client->notify_ctx != NULL)
imap_notify_deinit(&client->notify_ctx);
if (client->urlauth_ctx != NULL)
imap_urlauth_deinit(&client->urlauth_ctx);
if (client->anvil_sent) {
master_service_anvil_send(master_service, t_strconcat(
"DISCONNECT\t", my_pid, "\timap/",
mail_user_get_anvil_userip_ident(client->user),
"\n", NULL));
}
if (client->free_parser != NULL)
imap_parser_unref(&client->free_parser);
if (client->io != NULL)
io_remove(&client->io);
if (client->to_idle_output != NULL)
timeout_remove(&client->to_idle_output);
if (client->to_delayed_input != NULL)
timeout_remove(&client->to_delayed_input);
timeout_remove(&client->to_idle);
/* i/ostreams are already closed at this stage, so fd can be closed */
fd_close_maybe_stdio(&client->fd_in, &client->fd_out);
/* Autoexpunging might run for a long time. Disconnect the client
before it starts, and refresh proctitle so it's clear that it's
doing autoexpunging. We've also sent DISCONNECT to anvil already,
because this is background work and shouldn't really be counted
as an active IMAP session for the user. */
imap_refresh_proctitle();
mail_user_autoexpunge(client->user);
mail_user_unref(&client->user);
/* free the i/ostreams after mail_user_unref(), which could trigger
mail_storage_callbacks notifications that write to the ostream. */
i_stream_destroy(&client->input);
o_stream_destroy(&client->output);
if (array_is_created(&client->search_saved_uidset))
array_free(&client->search_saved_uidset);
if (array_is_created(&client->search_updates))
array_free(&client->search_updates);
pool_unref(&client->command_pool);
mail_storage_service_user_unref(&client->service_user);
imap_client_count--;
DLLIST_REMOVE(&imap_clients, client);
i_free(client->last_cmd_name);
pool_unref(&client->pool);
master_service_client_connection_destroyed(master_service);
imap_refresh_proctitle();
}
static void client_destroy_timeout(struct client *client)
{
client_destroy(client, NULL);
}
void client_disconnect(struct client *client, const char *reason)
{
if (client->disconnected)
return;
client_log_disconnect(client, reason);
client->disconnected = TRUE;
o_stream_nflush(client->output);
o_stream_uncork(client->output);
i_stream_close(client->input);
o_stream_close(client->output);
if (client->to_idle != NULL)
timeout_remove(&client->to_idle);
client->to_idle = timeout_add(0, client_destroy_timeout, client);
}
void client_disconnect_with_error(struct client *client, const char *msg)
{
client_send_line(client, t_strconcat("* BYE ", msg, NULL));
client_disconnect(client, msg);
}
void client_add_capability(struct client *client, const char *capability)
{
/* require a single capability at a time (feels cleaner) */
i_assert(strchr(capability, ' ') == NULL);
if (client->set->imap_capability[0] != '\0' &&
client->set->imap_capability[0] != '+') {
/* explicit capability - don't change it */
return;
}
str_append_c(client->capability_string, ' ');
str_append(client->capability_string, capability);
}
void client_send_line(struct client *client, const char *data)
{
(void)client_send_line_next(client, data);
}
int client_send_line_next(struct client *client, const char *data)
{
struct const_iovec iov[2];
if (client->output->closed)
return -1;
iov[0].iov_base = data;
iov[0].iov_len = strlen(data);
iov[1].iov_base = "\r\n";
iov[1].iov_len = 2;
if (o_stream_sendv(client->output, iov, 2) < 0)
return -1;
client->last_output = ioloop_time;
if (o_stream_get_buffer_used_size(client->output) >=
CLIENT_OUTPUT_OPTIMAL_SIZE) {
/* buffer full, try flushing */
return o_stream_flush(client->output);
}
return 1;
}
static void
client_cmd_append_timing_stats(struct client_command_context *cmd,
string_t *str)
{
unsigned int msecs_in_cmd, msecs_in_ioloop;
uint64_t ioloop_wait_usecs;
unsigned int msecs_since_cmd;
if (cmd->stats.start_time.tv_sec == 0)
return;
command_stats_flush(cmd);
ioloop_wait_usecs = io_loop_get_wait_usecs(current_ioloop);
msecs_in_cmd = (cmd->stats.running_usecs + 999) / 1000;
msecs_in_ioloop = (ioloop_wait_usecs -
cmd->stats.start_ioloop_wait_usecs + 999) / 1000;
msecs_since_cmd = timeval_diff_msecs(&ioloop_timeval,
&cmd->stats.last_run_timeval);
if (str_data(str)[str_len(str)-1] == '.')
str_truncate(str, str_len(str)-1);
str_printfa(str, " (%d.%03d + %d.%03d ",
msecs_in_cmd / 1000, msecs_in_cmd % 1000,
msecs_in_ioloop / 1000, msecs_in_ioloop % 1000);
if (msecs_since_cmd > 0) {
str_printfa(str, "+ %d.%03d ",
msecs_since_cmd / 1000, msecs_since_cmd % 1000);
}
str_append(str, "secs).");
}
void client_send_tagline(struct client_command_context *cmd, const char *data)
{
cmd->client->v.send_tagline(cmd, data);
}
static void
client_default_send_tagline(struct client_command_context *cmd, const char *data)
{
struct client *client = cmd->client;
const char *tag = cmd->tag;
if (client->output->closed || cmd->cancel)
return;
i_assert(!cmd->tagline_sent);
cmd->tagline_sent = TRUE;
cmd->tagline_reply = p_strdup(cmd->pool, data);
if (tag == NULL || *tag == '\0')
tag = "*";
T_BEGIN {
string_t *str = t_str_new(256);
str_printfa(str, "%s %s", tag, data);
client_cmd_append_timing_stats(cmd, str);
str_append(str, "\r\n");
o_stream_nsend(client->output, str_data(str), str_len(str));
} T_END;
client->last_output = ioloop_time;
}
static int
client_default_sync_notify_more(struct imap_sync_context *ctx ATTR_UNUSED)
{
return 1;
}
void client_send_command_error(struct client_command_context *cmd,
const char *msg)
{
struct client *client = cmd->client;
const char *error, *cmd_name;
enum imap_parser_error parse_error;
if (msg == NULL) {
msg = imap_parser_get_error(cmd->parser, &parse_error);
switch (parse_error) {
case IMAP_PARSE_ERROR_NONE:
i_unreached();
case IMAP_PARSE_ERROR_LITERAL_TOO_BIG:
client_disconnect_with_error(client, msg);
return;
default:
break;
}
}
if (cmd->tag == NULL)
error = t_strconcat("BAD Error in IMAP tag: ", msg, NULL);
else if (cmd->name == NULL)
error = t_strconcat("BAD Error in IMAP command: ", msg, NULL);
else {
cmd_name = t_str_ucase(cmd->name);
error = t_strconcat("BAD Error in IMAP command ",
cmd_name, ": ", msg, NULL);
}
client_send_tagline(cmd, error);
if (++client->bad_counter >= CLIENT_MAX_BAD_COMMANDS) {
client_disconnect_with_error(client,
"Too many invalid IMAP commands.");
}
cmd->param_error = TRUE;
/* client_read_args() failures rely on this being set, so that the
command processing is stopped even while command function returns
FALSE. */
cmd->state = CLIENT_COMMAND_STATE_DONE;
}
void client_send_internal_error(struct client_command_context *cmd)
{
client_send_tagline(cmd,
t_strflocaltime("NO "MAIL_ERRSTR_CRITICAL_MSG_STAMP, ioloop_time));
}
bool client_read_args(struct client_command_context *cmd, unsigned int count,
unsigned int flags, const struct imap_arg **args_r)
{
string_t *str;
int ret;
i_assert(count <= INT_MAX);
ret = imap_parser_read_args(cmd->parser, count, flags, args_r);
if (ret >= (int)count) {
/* all parameters read successfully */
i_assert(cmd->client->input_lock == NULL ||
cmd->client->input_lock == cmd);
str = t_str_new(256);
imap_write_args(str, *args_r);
cmd->args = p_strdup(cmd->pool, str_c(str));
str_truncate(str, 0);
imap_write_args_for_human(str, *args_r);
cmd->human_args = p_strdup(cmd->pool, str_c(str));
cmd->client->input_lock = NULL;
return TRUE;
} else if (ret == -2) {
/* need more data */
if (cmd->client->input->closed) {
/* disconnected */
cmd->state = CLIENT_COMMAND_STATE_DONE;
}
return FALSE;
} else {
/* error, or missing arguments */
client_send_command_error(cmd, ret < 0 ? NULL :
"Missing arguments");
return FALSE;
}
}
bool client_read_string_args(struct client_command_context *cmd,
unsigned int count, ...)
{
const struct imap_arg *imap_args;
va_list va;
const char *str;
unsigned int i;
if (!client_read_args(cmd, count, 0, &imap_args))
return FALSE;
va_start(va, count);
for (i = 0; i < count; i++) {
const char **ret = va_arg(va, const char **);
if (IMAP_ARG_IS_EOL(&imap_args[i])) {
client_send_command_error(cmd, "Missing arguments.");
break;
}
if (!imap_arg_get_astring(&imap_args[i], &str)) {
client_send_command_error(cmd, "Invalid arguments.");
break;
}
if (ret != NULL)
*ret = str;
}
va_end(va);
return i == count;
}
static struct client_command_context *
client_command_find_with_flags(struct client_command_context *new_cmd,
enum command_flags flags,
enum client_command_state max_state)
{
struct client_command_context *cmd;
cmd = new_cmd->client->command_queue;
for (; cmd != NULL; cmd = cmd->next) {
if (cmd->state <= max_state &&
cmd != new_cmd && (cmd->cmd_flags & flags) != 0)
return cmd;
}
return NULL;
}
static bool client_command_is_ambiguous(struct client_command_context *cmd)
{
enum command_flags flags;
enum client_command_state max_state =
CLIENT_COMMAND_STATE_WAIT_UNAMBIGUITY;
bool broken_client = FALSE;
if ((cmd->cmd_flags & COMMAND_FLAG_REQUIRES_SYNC) != 0 &&
!imap_sync_is_allowed(cmd->client))
return TRUE;
if (cmd->search_save_result_used) {
/* if there are pending commands that update the search
save result, wait */
struct client_command_context *old_cmd = cmd->next;
for (; old_cmd != NULL; old_cmd = old_cmd->next) {
if (old_cmd->search_save_result)
return TRUE;
}
}
if ((cmd->cmd_flags & COMMAND_FLAG_BREAKS_MAILBOX) ==
COMMAND_FLAG_BREAKS_MAILBOX) {
/* there must be no other command running that uses the
selected mailbox */
flags = COMMAND_FLAG_USES_MAILBOX;
max_state = CLIENT_COMMAND_STATE_DONE;
} else if ((cmd->cmd_flags & COMMAND_FLAG_USES_SEQS) != 0) {
/* no existing command must be breaking sequences */
flags = COMMAND_FLAG_BREAKS_SEQS;
broken_client = TRUE;
} else if ((cmd->cmd_flags & COMMAND_FLAG_BREAKS_SEQS) != 0) {
/* if existing command uses sequences, we'll have to block */
flags = COMMAND_FLAG_USES_SEQS;
} else {
return FALSE;
}
if (client_command_find_with_flags(cmd, flags, max_state) == NULL) {
if (cmd->client->syncing) {
/* don't do anything until syncing is finished */
return TRUE;
}
if (cmd->client->mailbox_change_lock != NULL &&
cmd->client->mailbox_change_lock != cmd) {
/* don't do anything until mailbox is fully
opened/closed */
return TRUE;
}
return FALSE;
}
if (broken_client) {
client_send_line(cmd->client,
"* BAD ["IMAP_RESP_CODE_CLIENTBUG"] "
"Command pipelining results in ambiguity.");
}
return TRUE;
}
struct client_command_context *client_command_alloc(struct client *client)
{
struct client_command_context *cmd;
cmd = p_new(client->command_pool, struct client_command_context, 1);
cmd->client = client;
cmd->pool = client->command_pool;
cmd->stats.start_time = ioloop_timeval;
cmd->stats.last_run_timeval = ioloop_timeval;
cmd->stats.start_ioloop_wait_usecs =
io_loop_get_wait_usecs(current_ioloop);
p_array_init(&cmd->module_contexts, cmd->pool, 5);
DLLIST_PREPEND(&client->command_queue, cmd);
client->command_queue_size++;
imap_client_notify_command_allocated(client);
return cmd;
}
static struct client_command_context *
client_command_new(struct client *client)
{
struct client_command_context *cmd;
cmd = client_command_alloc(client);
if (client->free_parser != NULL) {
cmd->parser = client->free_parser;
client->free_parser = NULL;
} else {
cmd->parser =
imap_parser_create(client->input, client->output,
client->set->imap_max_line_length);
if (client->set->imap_literal_minus)
imap_parser_enable_literal_minus(cmd->parser);
}
return cmd;
}
void client_add_missing_io(struct client *client)
{
if (client->io == NULL && !client->disconnected)
client->io = io_add_istream(client->input, client_input, client);
}
void client_command_free(struct client_command_context **_cmd)
{
struct client_command_context *cmd = *_cmd;
struct client *client = cmd->client;
enum client_command_state state = cmd->state;
*_cmd = NULL;
i_assert(!cmd->executing);
i_assert(client->output_cmd_lock == NULL);
/* reset input idle time because command output might have taken a
long time and we don't want to disconnect client immediately then */
client->last_input = ioloop_time;
timeout_reset(client->to_idle);
if (cmd->cancel) {
cmd->cancel = FALSE;
client_send_tagline(cmd, "NO Command cancelled.");
}
i_free(client->last_cmd_name);
client->last_cmd_name = i_strdup(cmd->name);
client->last_cmd_stats = cmd->stats;
if (!cmd->param_error)
client->bad_counter = 0;
if (client->input_lock == cmd)
client->input_lock = NULL;
if (client->mailbox_change_lock == cmd)
client->mailbox_change_lock = NULL;
if (cmd->parser != NULL) {
if (client->free_parser == NULL) {
imap_parser_reset(cmd->parser);
client->free_parser = cmd->parser;
} else {
imap_parser_unref(&cmd->parser);
}
}
client->command_queue_size--;
DLLIST_REMOVE(&client->command_queue, cmd);
cmd = NULL;
if (client->command_queue == NULL) {
/* no commands left in the queue, we can clear the pool */
p_clear(client->command_pool);
if (client->to_idle_output != NULL)
timeout_remove(&client->to_idle_output);
}
imap_client_notify_command_freed(client);
imap_refresh_proctitle();
/* if command finished from external event, check input for more
unhandled commands since we may not be executing from client_input
or client_output. */
if (state == CLIENT_COMMAND_STATE_WAIT_EXTERNAL &&
!client->disconnected) {
client_add_missing_io(client);
if (client->to_delayed_input == NULL) {
client->to_delayed_input =
timeout_add(0, client_input, client);
}
}
}
static void client_check_command_hangs(struct client *client)
{
struct client_command_context *cmd;
unsigned int unfinished_count = 0;
bool have_wait_unfinished = FALSE;
for (cmd = client->command_queue; cmd != NULL; cmd = cmd->next) {
switch (cmd->state) {
case CLIENT_COMMAND_STATE_WAIT_INPUT:
/* We need to be reading input for this command.
However, if there is already an output lock for
another command we'll wait for it to finish first.
This is needed because if there are any literals
we'd need to send "+ OK" responses. */
i_assert(client->io != NULL ||
(client->output_cmd_lock != NULL &&
client->output_cmd_lock != client->input_lock));
unfinished_count++;
break;
case CLIENT_COMMAND_STATE_WAIT_OUTPUT:
i_assert((io_loop_find_fd_conditions(current_ioloop, client->fd_out) & IO_WRITE) != 0);
unfinished_count++;
break;
case CLIENT_COMMAND_STATE_WAIT_EXTERNAL:
unfinished_count++;
break;
case CLIENT_COMMAND_STATE_WAIT_UNAMBIGUITY:
have_wait_unfinished = TRUE;
break;
case CLIENT_COMMAND_STATE_WAIT_SYNC:
if ((io_loop_find_fd_conditions(current_ioloop, client->fd_out) & IO_WRITE) == 0)
have_wait_unfinished = TRUE;
else {
/* we have an output callback, which will be
called soon and it'll run cmd_sync_delayed().
FIXME: is this actually wanted? */
}
break;
case CLIENT_COMMAND_STATE_DONE:
i_unreached();
}
}
i_assert(!have_wait_unfinished || unfinished_count > 0);
}
static bool client_remove_pending_unambiguity(struct client *client)
{
if (client->input_lock != NULL) {
/* there's a command that has locked the input */
struct client_command_context *cmd = client->input_lock;
if (cmd->state != CLIENT_COMMAND_STATE_WAIT_UNAMBIGUITY)
return TRUE;
/* the command is waiting for existing ambiguity causing
commands to finish. */
if (client_command_is_ambiguous(cmd)) {
/* we could be waiting for existing sync to finish */
if (!cmd_sync_delayed(client))
return FALSE;
if (client_command_is_ambiguous(cmd))
return FALSE;
}
cmd->state = CLIENT_COMMAND_STATE_WAIT_INPUT;
}
return TRUE;
}
void client_continue_pending_input(struct client *client)