diff options
Diffstat (limited to '')
| -rw-r--r-- | src/imap-hibernate/imap-client.c | 799 |
1 files changed, 799 insertions, 0 deletions
diff --git a/src/imap-hibernate/imap-client.c b/src/imap-hibernate/imap-client.c new file mode 100644 index 0000000..8e0f933 --- /dev/null +++ b/src/imap-hibernate/imap-client.c @@ -0,0 +1,799 @@ +/* Copyright (c) 2014-2018 Dovecot authors, see the included COPYING file */ + +#include "lib.h" +#include "array.h" +#include "ioloop.h" +#include "fdpass.h" +#include "hostpid.h" +#include "connection.h" +#include "iostream.h" +#include "istream.h" +#include "ostream.h" +#include "llist.h" +#include "priorityq.h" +#include "base64.h" +#include "str.h" +#include "strescape.h" +#include "time-util.h" +#include "var-expand.h" +#include "master-service.h" +#include "master-service-settings.h" +#include "imap-keepalive.h" +#include "imap-master-connection.h" +#include "imap-client.h" + +#include <unistd.h> + +#define IMAP_MASTER_SOCKET_NAME "imap-master" + +/* we only need enough for "DONE\r\n<tag> IDLE\r\n" */ +#define IMAP_MAX_INBUF 12 + 1 + 128 /* DONE\r\nIDLE\r\n + ' ' + <tag> */ +#define IMAP_MAX_OUTBUF 1024 + +/* If client has sent input and we can't recreate imap process in this + many seconds, disconnect the client. */ +#define IMAP_CLIENT_MOVE_BACK_WITH_INPUT_TIMEOUT_SECS 10 +/* If there's a change notification and we can't recreate imap process in this + many seconds, disconnect the client. */ +#define IMAP_CLIENT_MOVE_BACK_WITHOUT_INPUT_TIMEOUT_SECS (60*5) + +/* How often to try to unhibernate clients. */ +#define IMAP_UNHIBERNATE_RETRY_MSECS 100 + +#define IMAP_CLIENT_BUFFER_FULL_ERROR "Client output buffer is full" +#define IMAP_CLIENT_UNHIBERNATE_ERROR "Failed to unhibernate client" + +enum imap_client_input_state { + IMAP_CLIENT_INPUT_STATE_UNKNOWN, + IMAP_CLIENT_INPUT_STATE_BAD, + IMAP_CLIENT_INPUT_STATE_DONE_LF, + IMAP_CLIENT_INPUT_STATE_DONE_CRLF, + IMAP_CLIENT_INPUT_STATE_DONEIDLE +}; + +struct imap_client_notify { + int fd; + struct io *io; +}; + +struct imap_client { + struct priorityq_item item; + + struct imap_client *prev, *next; + pool_t pool; + struct event *event; + struct imap_client_state state; + ARRAY(struct imap_client_notify) notifys; + + time_t move_back_start; + struct timeout *to_move_back; + + int fd; + struct io *io; + struct istream *input; + struct ostream *output; + struct timeout *to_keepalive; + struct imap_master_connection *master_conn; + struct ioloop_context *ioloop_ctx; + const char *log_prefix; + unsigned int next_read_threshold; + bool bad_done, idle_done; + bool unhibernate_queued; + bool input_pending; +}; + +static struct imap_client *imap_clients; +static struct priorityq *unhibernate_queue; +static struct timeout *to_unhibernate; +static const char imap_still_here_text[] = "* OK Still here\r\n"; + +static struct event_category event_category_imap = { + .name = "imap", +}; +static struct event_category event_category_imap_hibernate = { + .name = "imap-hibernate", + .parent = &event_category_imap, +}; + +static void imap_client_stop(struct imap_client *client); +void imap_client_destroy(struct imap_client **_client, const char *reason); +static void imap_client_add_idle_keepalive_timeout(struct imap_client *client); +static void imap_clients_unhibernate(void *context); +static void imap_client_stop_notify_listening(struct imap_client *client); + +static void imap_client_disconnected(struct imap_client **_client) +{ + struct imap_client *client = *_client; + const char *reason; + + reason = io_stream_get_disconnect_reason(client->input, client->output); + imap_client_destroy(_client, reason); +} + +static void +imap_client_unhibernate_failed(struct imap_client **_client, const char *error) +{ + struct imap_client *client = *_client; + struct timeval created; + event_get_create_time(client->event, &created); + + struct event_passthrough *e = + event_create_passthrough(client->event)-> + set_name("imap_client_unhibernated")-> + add_int("hibernation_usecs", + timeval_diff_usecs(&ioloop_timeval, &created))-> + add_str("error", error); + e_error(e->event(), IMAP_CLIENT_UNHIBERNATE_ERROR": %s", error); + imap_client_destroy(_client, IMAP_CLIENT_UNHIBERNATE_ERROR); +} + +static void +imap_client_parse_userdb_fields(struct imap_client *client, + const char **auth_user_r) +{ + const char *const *field; + unsigned int i; + + *auth_user_r = NULL; + + if (client->state.userdb_fields == NULL) + return; + + field = t_strsplit_tabescaped(client->state.userdb_fields); + for (i = 0; field[i] != NULL; i++) { + if (str_begins(field[i], "auth_user=")) + *auth_user_r = field[i] + 10; + } +} + +static void +imap_client_move_back_send_callback(void *context, struct ostream *output) +{ + struct imap_client *client = context; + const struct imap_client_state *state = &client->state; + string_t *str = t_str_new(256); + struct timeval created; + const unsigned char *input_data; + size_t input_size; + ssize_t ret; + + str_append_tabescaped(str, state->username); + event_get_create_time(client->event, &created); + str_printfa(str, "\thibernation_started=%"PRIdTIME_T".%06u", + created.tv_sec, (unsigned int)created.tv_usec); + + if (state->session_id != NULL) { + str_append(str, "\tsession="); + str_append_tabescaped(str, state->session_id); + } + if (state->session_created != 0) { + str_printfa(str, "\tsession_created=%s", + dec2str(state->session_created)); + } + if (state->tag != NULL) + str_printfa(str, "\ttag=%s", client->state.tag); + if (state->local_ip.family != 0) + str_printfa(str, "\tlip=%s", net_ip2addr(&state->local_ip)); + if (state->local_port != 0) + str_printfa(str, "\tlport=%u", state->local_port); + if (state->remote_ip.family != 0) + str_printfa(str, "\trip=%s", net_ip2addr(&state->remote_ip)); + if (state->remote_port != 0) + str_printfa(str, "\trport=%u", state->remote_port); + if (state->userdb_fields != NULL) { + str_append(str, "\tuserdb_fields="); + str_append_tabescaped(str, state->userdb_fields); + } + if (major(state->peer_dev) != 0 || minor(state->peer_dev) != 0) { + str_printfa(str, "\tpeer_dev_major=%lu\tpeer_dev_minor=%lu", + (unsigned long)major(state->peer_dev), + (unsigned long)minor(state->peer_dev)); + } + if (state->peer_ino != 0) + str_printfa(str, "\tpeer_ino=%llu", (unsigned long long)state->peer_ino); + if (state->state_size > 0) { + str_append(str, "\tstate="); + base64_encode(state->state, state->state_size, str); + } + input_data = i_stream_get_data(client->input, &input_size); + if (input_size > 0) { + str_append(str, "\tclient_input="); + base64_encode(input_data, input_size, str); + } + i_assert(o_stream_get_buffer_used_size(client->output) == 0); + if (client->idle_done) { + if (client->bad_done) + str_append(str, "\tbad-done"); + } else if (client->state.idle_cmd) { + /* IDLE continues after sending changes */ + str_append(str, "\tidle-continue"); + } + str_append_c(str, '\n'); + + /* send the fd first */ + ret = fd_send(o_stream_get_fd(output), client->fd, str_data(str), 1); + if (ret < 0) { + const char *error = t_strdup_printf( + "fd_send(%s) failed: %m", o_stream_get_name(output)); + imap_client_unhibernate_failed(&client, error); + return; + } + i_assert(ret > 0); + o_stream_nsend(output, str_data(str) + 1, str_len(str) - 1); +} + +static void +imap_client_move_back_read_callback(void *context, const char *line) +{ + struct imap_client *client = context; + + if (line[0] != '+') { + /* failed - FIXME: retry later? */ + imap_client_unhibernate_failed(&client, line+1); + } else { + imap_client_destroy(&client, NULL); + } +} + +static bool imap_move_has_reached_timeout(struct imap_client *client) +{ + int max_secs = client->input_pending ? + IMAP_CLIENT_MOVE_BACK_WITH_INPUT_TIMEOUT_SECS : + IMAP_CLIENT_MOVE_BACK_WITHOUT_INPUT_TIMEOUT_SECS; + return client->move_back_start != 0 && + ioloop_time - client->move_back_start > max_secs; +} + +static bool imap_client_try_move_back(struct imap_client *client) +{ + const struct master_service_settings *master_set; + const char *path, *error; + int ret; + + if (o_stream_get_buffer_used_size(client->output) > 0) { + /* there is data buffered, so we have to disconnect you */ + imap_client_destroy(&client, IMAP_CLIENT_BUFFER_FULL_ERROR); + return TRUE; + } + + master_set = master_service_settings_get(master_service); + path = t_strconcat(master_set->base_dir, + "/"IMAP_MASTER_SOCKET_NAME, NULL); + ret = imap_master_connection_init(path, + imap_client_move_back_send_callback, + imap_client_move_back_read_callback, + client, &client->master_conn, &error); + if (ret > 0) { + /* success */ + imap_client_stop(client); + return TRUE; + } else if (ret < 0 || imap_move_has_reached_timeout(client)) { + /* failed to connect to the imap-master socket */ + imap_client_unhibernate_failed(&client, error); + return TRUE; + } + + e_debug(event_create_passthrough(client->event)-> + set_name("imap_client_unhibernate_retried")-> + add_str("error", error)->event(), + "Unhibernation failed: %s - retrying", error); + /* Stop listening for client's IOs while waiting for the next + reconnection attempt. However if we got here because of an external + notification keep waiting to see if client sends any IO, since that + will cause the unhibernation to be aborted earlier. */ + if (client->input_pending) + io_remove(&client->io); + imap_client_stop_notify_listening(client); + return FALSE; +} + +static void imap_client_move_back(struct imap_client *client) +{ + if (imap_client_try_move_back(client)) + return; + + /* imap-master socket is busy. retry in a while. */ + if (client->move_back_start == 0) + client->move_back_start = ioloop_time; + if (!client->unhibernate_queued) { + client->unhibernate_queued = TRUE; + priorityq_add(unhibernate_queue, &client->item); + } + if (to_unhibernate == NULL) { + to_unhibernate = timeout_add_short(IMAP_UNHIBERNATE_RETRY_MSECS, + imap_clients_unhibernate, NULL); + } +} + +static enum imap_client_input_state +imap_client_input_parse(const unsigned char *data, size_t size, const char **tag_r) +{ + const unsigned char *tag_start, *tag_end; + + enum imap_client_input_state state = IMAP_CLIENT_INPUT_STATE_DONE_LF; + + /* skip over DONE[\r]\n */ + if (i_memcasecmp(data, "DONE", I_MIN(size, 4)) != 0) + return IMAP_CLIENT_INPUT_STATE_BAD; + if (size <= 4) + return IMAP_CLIENT_INPUT_STATE_UNKNOWN; + data += 4; size -= 4; + + if (data[0] == '\r') { + state = IMAP_CLIENT_INPUT_STATE_DONE_CRLF; + data++; size--; + } + if (size == 0) + return IMAP_CLIENT_INPUT_STATE_UNKNOWN; + if (data[0] != '\n') + return IMAP_CLIENT_INPUT_STATE_BAD; + data++; size--; + if (size == 0) + return state; + + tag_start = data; + + /* skip over tag */ + while(data[0] != ' ' && + data[0] != '\r' && + data[0] != '\t' ) { data++; size--; } + + tag_end = data; + + if (size == 0) + return state; + if (data[0] != ' ') + return IMAP_CLIENT_INPUT_STATE_BAD; + data++; size--; + + /* skip over IDLE[\r]\n - checking this assumes that the DONE and IDLE + are sent in the same IP packet, otherwise we'll unnecessarily + recreate the imap process and immediately resume IDLE there. if this + becomes an issue we could add a small delay to the imap process + creation and wait for the IDLE command during it. */ + if (size <= 4 || i_memcasecmp(data, "IDLE", 4) != 0) + return state; + data += 4; size -= 4; + + if (data[0] == '\r') { + data++; size--; + } + if (size == 1 && data[0] == '\n') { + *tag_r = t_strdup_until(tag_start, tag_end); + return IMAP_CLIENT_INPUT_STATE_DONEIDLE; + } + return state; +} + +static void imap_client_input_idle_cmd(struct imap_client *client) +{ + char *old_tag; + const char *new_tag; + const char *output; + const unsigned char *data; + size_t size; + bool done = TRUE; + int ret; + + /* we should read either DONE or disconnection. also handle if client + sends DONE\nIDLE simply to recreate the IDLE. */ + ret = i_stream_read_bytes(client->input, &data, &size, + client->next_read_threshold + 1); + if (size == 0) { + if (ret < 0) + imap_client_disconnected(&client); + return; + } + client->next_read_threshold = 0; + switch (imap_client_input_parse(data, size, &new_tag)) { + case IMAP_CLIENT_INPUT_STATE_UNKNOWN: + /* we haven't received a full DONE[\r]\n yet - wait */ + client->next_read_threshold = size; + return; + case IMAP_CLIENT_INPUT_STATE_BAD: + /* invalid input - return this to the imap process */ + client->bad_done = TRUE; + break; + case IMAP_CLIENT_INPUT_STATE_DONE_LF: + i_stream_skip(client->input, 4+1); + break; + case IMAP_CLIENT_INPUT_STATE_DONE_CRLF: + i_stream_skip(client->input, 4+2); + break; + case IMAP_CLIENT_INPUT_STATE_DONEIDLE: + /* we received DONE+IDLE, so the client simply wanted to notify + us that it's still there. continue hibernation. */ + old_tag = client->state.tag; + client->state.tag = i_strdup(new_tag); + output = t_strdup_printf("%s OK Idle completed.\r\n+ idling\r\n", old_tag); + i_free(old_tag); + ret = o_stream_flush(client->output); + if (ret > 0) + ret = o_stream_send_str(client->output, output); + if (ret < 0) { + imap_client_disconnected(&client); + return; + } + if ((size_t)ret != strlen(output)) { + /* disconnect */ + imap_client_destroy(&client, IMAP_CLIENT_BUFFER_FULL_ERROR); + return; + } else { + done = FALSE; + i_stream_skip(client->input, size); + } + break; + } + + if (done) { + client->idle_done = TRUE; + client->input_pending = TRUE; + imap_client_move_back(client); + } else + imap_client_add_idle_keepalive_timeout(client); +} + +static void imap_client_input_nonidle(struct imap_client *client) +{ + if (i_stream_read(client->input) < 0) + imap_client_disconnected(&client); + else { + client->input_pending = TRUE; + imap_client_move_back(client); + } +} + +static void imap_client_input_notify(struct imap_client *client) +{ + imap_client_move_back(client); +} + +static void keepalive_timeout(struct imap_client *client) +{ + ssize_t ret; + + /* do not send this if there is data buffered */ + if ((ret = o_stream_flush(client->output)) < 0) { + imap_client_disconnected(&client); + return; + } else if (ret == 0) + return; + + ret = o_stream_send_str(client->output, imap_still_here_text); + if (ret < 0) { + imap_client_disconnected(&client); + return; + } + /* ostream buffer size is definitely large enough for this text */ + i_assert((size_t)ret == strlen(imap_still_here_text)); + imap_client_add_idle_keepalive_timeout(client); +} + +static void imap_client_add_idle_keepalive_timeout(struct imap_client *client) +{ + unsigned int interval = client->state.imap_idle_notify_interval; + + if (interval == 0) + return; + + interval = imap_keepalive_interval_msecs(client->state.username, + &client->state.remote_ip, + interval); + + timeout_remove(&client->to_keepalive); + client->to_keepalive = timeout_add(interval, keepalive_timeout, client); +} + +static const struct var_expand_table * +imap_client_get_var_expand_table(struct imap_client *client) +{ + const char *username = t_strcut(client->state.username, '@'); + const char *domain = i_strchr_to_next(client->state.username, '@'); + const char *local_ip = client->state.local_ip.family == 0 ? NULL : + net_ip2addr(&client->state.local_ip); + const char *remote_ip = client->state.remote_ip.family == 0 ? NULL : + net_ip2addr(&client->state.remote_ip); + + const char *auth_user, *auth_username, *auth_domain; + imap_client_parse_userdb_fields(client, &auth_user); + if (auth_user == NULL) { + auth_user = client->state.username; + auth_username = username; + auth_domain = domain; + } else { + auth_username = t_strcut(auth_user, '@'); + auth_domain = i_strchr_to_next(auth_user, '@'); + } + + const struct var_expand_table stack_tab[] = { + { 'u', client->state.username, "user" }, + { 'n', username, "username" }, + { 'd', domain, "domain" }, + { 's', "imap-hibernate", "service" }, + { 'h', NULL /* we shouldn't need this */, "home" }, + { 'l', local_ip, "lip" }, + { 'r', remote_ip, "rip" }, + { 'p', my_pid, "pid" }, + { 'i', dec2str(client->state.uid), "uid" }, + { '\0', dec2str(client->state.gid), "gid" }, + { '\0', client->state.session_id, "session" }, + { '\0', auth_user, "auth_user" }, + { '\0', auth_username, "auth_username" }, + { '\0', auth_domain, "auth_domain" }, + /* aliases: */ + { '\0', local_ip, "local_ip" }, + { '\0', remote_ip, "remote_ip" }, + /* NOTE: keep this synced with lib-storage's + mail_user_var_expand_table() */ + { '\0', NULL, NULL } + }; + struct var_expand_table *tab; + + tab = t_malloc_no0(sizeof(stack_tab)); + memcpy(tab, stack_tab, sizeof(stack_tab)); + return tab; +} + +static int +imap_client_var_expand_func_userdb(const char *data, void *context, + const char **value_r, const char **error_r ATTR_UNUSED) +{ + const char *const *fields = context; + const char *field_name = t_strdup_printf("%s=",t_strcut(data, ':')); + const char *default_value = i_strchr_to_next(data, ':'); + const char *value = NULL; + + for(;*fields != NULL; fields++) { + if (str_begins(*fields, field_name)) { + value = *fields+strlen(field_name); + break; + } + } + + *value_r = value != NULL ? value : default_value; + + return 1; +} + +static void imap_client_io_activate_user(struct imap_client *client) +{ + i_set_failure_prefix("%s", client->log_prefix); +} + +static void imap_client_io_deactivate_user(struct imap_client *client ATTR_UNUSED) +{ + i_set_failure_prefix("imap-hibernate: "); +} + +static const char *imap_client_get_anvil_userip_ident(struct imap_client_state *state) +{ + if (state->remote_ip.family == 0) + return NULL; + return t_strconcat(net_ip2addr(&state->remote_ip), "/", + str_tabescape(state->username), NULL); +} + +struct imap_client * +imap_client_create(int fd, const struct imap_client_state *state) +{ + const struct var_expand_func_table funcs[] = { + { "userdb", imap_client_var_expand_func_userdb }, + { NULL, NULL } + }; + struct imap_client *client; + pool_t pool = pool_alloconly_create("imap client", 256); + void *statebuf; + const char *ident, *error; + + i_assert(state->username != NULL); + i_assert(state->mail_log_prefix != NULL); + + fd_set_nonblock(fd, TRUE); /* it should already be, but be sure */ + + client = p_new(pool, struct imap_client, 1); + client->pool = pool; + client->fd = fd; + client->input = i_stream_create_fd(fd, IMAP_MAX_INBUF); + client->output = o_stream_create_fd(fd, IMAP_MAX_OUTBUF); + client->state = *state; + client->state.username = p_strdup(pool, state->username); + client->state.session_id = p_strdup(pool, state->session_id); + client->state.userdb_fields = p_strdup(pool, state->userdb_fields); + client->state.stats = p_strdup(pool, state->stats); + + client->event = event_create(NULL); + event_add_category(client->event, &event_category_imap_hibernate); + event_add_str(client->event, "user", state->username); + event_add_str(client->event, "session", state->session_id); + if (state->mailbox_vname != NULL) + event_add_str(client->event, "mailbox", state->mailbox_vname); + if (state->local_ip.family != 0) + event_add_str(client->event, "local_ip", + net_ip2addr(&state->local_ip)); + if (state->local_port != 0) + event_add_int(client->event, "local_port", state->local_port); + if (state->remote_ip.family != 0) + event_add_str(client->event, "remote_ip", + net_ip2addr(&state->remote_ip)); + if (state->remote_port != 0) + event_add_int(client->event, "remote_port", state->remote_port); + + if (state->state_size > 0) { + client->state.state = statebuf = p_malloc(pool, state->state_size); + memcpy(statebuf, state->state, state->state_size); + client->state.state_size = state->state_size; + } + T_BEGIN { + string_t *str; + char **fields = p_strsplit_tabescaped(unsafe_data_stack_pool, + client->state.userdb_fields); + str = t_str_new(256); + if (var_expand_with_funcs(str, state->mail_log_prefix, + imap_client_get_var_expand_table(client), + funcs, fields, &error) <= 0) { + e_error(client->event, + "Failed to expand mail_log_prefix=%s: %s", + state->mail_log_prefix, error); + } + client->log_prefix = p_strdup(pool, str_c(str)); + } T_END; + + ident = imap_client_get_anvil_userip_ident(&client->state); + if (ident != NULL) { + master_service_anvil_send(master_service, t_strconcat( + "CONNECT\t", my_pid, "\timap/", ident, "\n", NULL)); + client->state.anvil_sent = TRUE; + } + + p_array_init(&client->notifys, pool, 2); + DLLIST_PREPEND(&imap_clients, client); + return client; +} + +static void imap_client_stop_notify_listening(struct imap_client *client) +{ + struct imap_client_notify *notify; + + array_foreach_modifiable(&client->notifys, notify) { + io_remove(¬ify->io); + i_close_fd(¬ify->fd); + } +} + +static void imap_client_stop(struct imap_client *client) +{ + if (client->unhibernate_queued) { + priorityq_remove(unhibernate_queue, &client->item); + client->unhibernate_queued = FALSE; + } + io_remove(&client->io); + timeout_remove(&client->to_keepalive); + imap_client_stop_notify_listening(client); +} + +void imap_client_destroy(struct imap_client **_client, const char *reason) +{ + struct imap_client *client = *_client; + + *_client = NULL; + + if (reason != NULL) { + /* the client input/output bytes don't count the DONE+IDLE by + imap-hibernate, but that shouldn't matter much. */ + e_info(client->event, "Disconnected: %s %s", + reason, client->state.stats); + } + + if (client->state.anvil_sent) { + master_service_anvil_send(master_service, t_strconcat( + "DISCONNECT\t", my_pid, "\timap/", + imap_client_get_anvil_userip_ident(&client->state), + "\n", NULL)); + } + + if (client->master_conn != NULL) + imap_master_connection_free(&client->master_conn); + if (client->ioloop_ctx != NULL) { + io_loop_context_remove_callbacks(client->ioloop_ctx, + imap_client_io_activate_user, + imap_client_io_deactivate_user, client); + imap_client_io_deactivate_user(client); + io_loop_context_unref(&client->ioloop_ctx); + } + + if (client->state.tag != NULL) + i_free(client->state.tag); + + DLLIST_REMOVE(&imap_clients, client); + imap_client_stop(client); + i_stream_destroy(&client->input); + o_stream_destroy(&client->output); + i_close_fd(&client->fd); + event_unref(&client->event); + pool_unref(&client->pool); + + master_service_client_connection_destroyed(master_service); +} + +void imap_client_add_notify_fd(struct imap_client *client, int fd) +{ + struct imap_client_notify *notify; + + notify = array_append_space(&client->notifys); + notify->fd = fd; +} + +void imap_client_create_finish(struct imap_client *client) +{ + struct imap_client_notify *notify; + + client->ioloop_ctx = io_loop_context_new(current_ioloop); + io_loop_context_add_callbacks(client->ioloop_ctx, + imap_client_io_activate_user, + imap_client_io_deactivate_user, client); + io_loop_context_switch(client->ioloop_ctx); + + if (client->state.idle_cmd) { + client->io = io_add(client->fd, IO_READ, + imap_client_input_idle_cmd, client); + } else { + client->io = io_add(client->fd, IO_READ, + imap_client_input_nonidle, client); + } + imap_client_add_idle_keepalive_timeout(client); + + array_foreach_modifiable(&client->notifys, notify) { + notify->io = io_add(notify->fd, IO_READ, + imap_client_input_notify, client); + } +} + +static int client_unhibernate_cmp(const void *p1, const void *p2) +{ + const struct imap_client *c1 = p1, *c2 = p2; + time_t t1, t2; + + t1 = c1->move_back_start + + (c1->input_pending ? + IMAP_CLIENT_MOVE_BACK_WITH_INPUT_TIMEOUT_SECS : + IMAP_CLIENT_MOVE_BACK_WITHOUT_INPUT_TIMEOUT_SECS); + t2 = c2->move_back_start + + (c2->input_pending ? + IMAP_CLIENT_MOVE_BACK_WITH_INPUT_TIMEOUT_SECS : + IMAP_CLIENT_MOVE_BACK_WITHOUT_INPUT_TIMEOUT_SECS); + if (t1 < t2) + return -1; + if (t1 > t2) + return 1; + return 0; +} + +static void imap_clients_unhibernate(void *context ATTR_UNUSED) +{ + struct priorityq_item *item; + + while ((item = priorityq_peek(unhibernate_queue)) != NULL) { + struct imap_client *client = (struct imap_client *)item; + + if (!imap_client_try_move_back(client)) + return; + } + timeout_remove(&to_unhibernate); +} + +void imap_clients_init(void) +{ + unhibernate_queue = priorityq_init(client_unhibernate_cmp, 64); +} + +void imap_clients_deinit(void) +{ + while (imap_clients != NULL) { + struct imap_client *client = imap_clients; + + imap_client_io_activate_user(client); + imap_client_destroy(&client, "Shutting down"); + } + timeout_remove(&to_unhibernate); + priorityq_deinit(&unhibernate_queue); +} |