Send queries to outside servers and wait for answers from servers. More...
#include <outside_network.h>
Data Fields | |
| struct comm_base * | base |
| Base for select calls. | |
| time_t * | now_secs |
| pointer to time in seconds | |
| struct timeval * | now_tv |
| pointer to time in microseconds | |
| struct sldns_buffer * | udp_buff |
| buffer shared by UDP connections, since there is only one datagram at any time. | |
| size_t | svcd_overhead |
| serviced_callbacks malloc overhead when processing multiple identical serviced queries to the same server. | |
| int | use_caps_for_id |
| use x20 bits to encode additional ID random bits | |
| int | want_to_quit |
| outside network wants to quit. | |
| size_t | unwanted_replies |
| number of unwanted replies received (for statistics) | |
| size_t | unwanted_total |
| cumulative total of unwanted replies (for defense) | |
| size_t | unwanted_threshold |
| threshold when to take defensive action. | |
| void(* | unwanted_action )(void *) |
| what action to take, called when defensive action is needed | |
| void * | unwanted_param |
| user param for action | |
| struct port_comm * | unused_fds |
| linked list of available commpoints, unused file descriptors, for use as outgoing UDP ports. | |
| int | do_udp |
| if udp is done | |
| int | delayclose |
| if udp is delay-closed (delayed answers do not meet closed port) | |
| struct timeval | delay_tv |
| timeout for delayclose | |
| int | udp_connect |
| if we perform udp-connect, connect() for UDP socket to mitigate ICMP side channel leakage | |
| size_t | num_udp_outgoing |
| number of udp packets sent. | |
| struct port_if * | ip4_ifs |
| array of outgoing IP4 interfaces | |
| int | num_ip4 |
| number of outgoing IP4 interfaces | |
| struct port_if * | ip6_ifs |
| array of outgoing IP6 interfaces | |
| int | num_ip6 |
| number of outgoing IP6 interfaces | |
| struct pending * | udp_wait_first |
| pending udp queries waiting to be sent out, waiting for fd | |
| struct pending * | udp_wait_last |
| last pending udp query in list | |
| rbtree_type * | pending |
| pending udp answers. | |
| rbtree_type * | serviced |
| serviced queries, sorted by qbuf, addr, dnssec | |
| struct infra_cache * | infra |
| host cache, pointer but not owned by outnet. | |
| struct ub_randstate * | rnd |
| where to get random numbers | |
| void * | sslctx |
| ssl context to create ssl wrapped TCP with DNS connections | |
| int | tls_use_sni |
| if SNI will be used for TLS connections | |
| int | tcp_mss |
| maximum segment size of tcp socket | |
| int | ip_dscp |
| IP_TOS socket option requested on the sockets. | |
| struct pending_tcp ** | tcp_conns |
| Array of tcp pending used for outgoing TCP connections. | |
| size_t | num_tcp |
| number of tcp communication points. | |
| size_t | num_tcp_outgoing |
| number of tcp communication points in use. | |
| size_t | max_reuse_tcp_queries |
| max number of queries on a reuse connection | |
| int | tcp_reuse_timeout |
| timeout for REUSE entries in milliseconds. | |
| int | tcp_auth_query_timeout |
| timeout in milliseconds for TCP queries to auth servers. | |
| rbtree_type | tcp_reuse |
| tree of still-open and waiting tcp connections for reuse. | |
| size_t | tcp_reuse_max |
| max number of tcp_reuse entries we want to keep open | |
| struct reuse_tcp * | tcp_reuse_first |
| first and last(oldest) in lru list of reuse connections. | |
| struct reuse_tcp * | tcp_reuse_last |
| struct pending_tcp * | tcp_free |
| list of tcp comm points that are free for use | |
| struct waiting_tcp * | tcp_wait_first |
| list of tcp queries waiting for a buffer | |
| struct waiting_tcp * | tcp_wait_last |
| last of waiting query list | |
Send queries to outside servers and wait for answers from servers.
Contains answer-listen sockets.
| int outside_network::want_to_quit |
outside network wants to quit.
Stop queued msgs from sent.
Referenced by auth_xfer_probe_lookup_callback(), auth_xfer_probe_timer_callback(), auth_xfer_probe_udp_callback(), auth_xfer_timer(), auth_xfer_transfer_http_callback(), auth_xfer_transfer_lookup_callback(), auth_xfer_transfer_tcp_callback(), auth_xfer_transfer_timer_callback(), auth_zonemd_dnskey_lookup_callback(), libworker_bg_done_cb(), outnet_send_wait_udp(), outside_network_create(), outside_network_delete(), outside_network_quit_prepare(), and use_free_buffer().
| size_t outside_network::unwanted_threshold |
threshold when to take defensive action.
If 0 then never.
Referenced by fr_worker_pickup_outside_network(), outnet_udp_cb(), and outside_network_create().
| struct port_comm* outside_network::unused_fds |
linked list of available commpoints, unused file descriptors, for use as outgoing UDP ports.
cp.fd=-1 in them.
Referenced by outnet_get_mem(), outnet_send_wait_udp(), outside_network_create(), outside_network_delete(), pending_udp_query(), portcomm_loweruse(), and select_ifport().
| rbtree_type* outside_network::pending |
pending udp answers.
sorted by id, addr
Referenced by iterator_set_ip46_support(), outnet_get_mem(), outnet_udp_cb(), outside_network_create(), outside_network_delete(), pending_delete(), and select_id().
| struct pending_tcp** outside_network::tcp_conns |
Array of tcp pending used for outgoing TCP connections.
Each can be used to establish a TCP connection with a server. The file descriptors are -1 if they are free, and need to be opened for the tcp connection. Can be used for ip4 and ip6.
Referenced by check_removal(), check_snip(), create_pending_tcp(), create_pending_tcp(), outnet_get_mem(), outside_network_delete(), and tcp_reuse_tree_list_test().
| rbtree_type outside_network::tcp_reuse |
tree of still-open and waiting tcp connections for reuse.
can be closed and reopened to get a new tcp connection. or reused to the same destination again. with timeout to close. Entries are of type struct reuse_tcp. The entries are both active and empty connections.
Referenced by check_snip(), check_tree_and_list(), empty_tree(), outnet_tcp_cb(), outside_network_create(), outside_network_delete(), reuse_tcp_find(), reuse_tcp_insert(), reuse_tcp_remove_serviced_keep(), reuse_tcp_remove_tree_list(), and tcp_reuse_tree_list_test().
| struct reuse_tcp* outside_network::tcp_reuse_first |
first and last(oldest) in lru list of reuse connections.
the oldest can be closed to get a new free pending_tcp if needed The list contains empty connections, that wait for timeout or a new query that can use the existing connection.
Referenced by check_removal(), check_snip(), check_tree_and_list(), empty_tree(), outnet_waiting_tcp_list_add_first(), outside_network_delete(), reuse_tcp_insert(), reuse_tcp_lru_snip(), reuse_tcp_lru_touch(), reuse_tcp_remove_tree_list(), tcp_reuse_tree_list_test(), and use_free_buffer().