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Tor 0.4.9.0-alpha-dev
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Handle edge streams. More...
#include "core/or/or.h"#include "lib/err/backtrace.h"#include "app/config/config.h"#include "core/mainloop/connection.h"#include "core/mainloop/mainloop.h"#include "core/mainloop/netstatus.h"#include "core/or/channel.h"#include "core/or/circuitbuild.h"#include "core/or/circuitlist.h"#include "core/or/circuituse.h"#include "core/or/circuitpadding.h"#include "core/or/connection_edge.h"#include "core/or/congestion_control_flow.h"#include "core/or/conflux_util.h"#include "core/or/circuitstats.h"#include "core/or/connection_or.h"#include "core/or/dos.h"#include "core/or/extendinfo.h"#include "core/or/policies.h"#include "core/or/reasons.h"#include "core/or/relay.h"#include "core/or/sendme.h"#include "core/proto/proto_http.h"#include "core/proto/proto_socks.h"#include "feature/client/addressmap.h"#include "feature/client/circpathbias.h"#include "feature/client/dnsserv.h"#include "feature/control/control_events.h"#include "feature/dircache/dirserv.h"#include "feature/dircommon/directory.h"#include "feature/hibernate/hibernate.h"#include "feature/hs/hs_cache.h"#include "feature/hs/hs_circuit.h"#include "feature/hs/hs_client.h"#include "feature/hs/hs_common.h"#include "feature/nodelist/describe.h"#include "feature/nodelist/networkstatus.h"#include "feature/nodelist/nodelist.h"#include "feature/nodelist/routerlist.h"#include "feature/nodelist/routerset.h"#include "feature/relay/dns.h"#include "feature/relay/router.h"#include "feature/relay/routermode.h"#include "feature/rend/rendcommon.h"#include "feature/stats/predict_ports.h"#include "feature/stats/rephist.h"#include "lib/buf/buffers.h"#include "lib/crypt_ops/crypto_rand.h"#include "lib/crypt_ops/crypto_util.h"#include "lib/encoding/confline.h"#include "core/or/cell_st.h"#include "core/or/cpath_build_state_st.h"#include "feature/dircommon/dir_connection_st.h"#include "core/or/entry_connection_st.h"#include "core/or/extend_info_st.h"#include "feature/nodelist/node_st.h"#include "core/or/or_circuit_st.h"#include "core/or/origin_circuit_st.h"#include "core/or/half_edge_st.h"#include "core/or/socks_request_st.h"#include "lib/evloop/compat_libevent.h"Go to the source code of this file.
Macros | |
| #define | CONNECTION_EDGE_PRIVATE |
| #define | SOCKS4_GRANTED 90 |
| #define | SOCKS4_REJECT 91 |
| #define | WARN_FAILED_HS_CONNECTION 300 |
| #define | MAX_CONNECTED_CELL_PAYLOAD_LEN 25 |
| #define | TRACKHOSTEXITS_RETRIES 5 |
| #define | WARN_INTRVL_LOOP 300 |
| #define | WARN_INTRVL_PRIV 300 |
Variables | |
| static size_t | n_half_conns_allocated = 0 |
| static smartlist_t * | pending_entry_connections = NULL |
| static int | untried_pending_connections = 0 |
| static mainloop_event_t * | attach_pending_entry_connections_ev = NULL |
| static const char | HTTP_CONNECT_IS_NOT_AN_HTTP_PROXY_MSG [] |
Handle edge streams.
An edge_connection_t is a subtype of a connection_t, and represents two critical concepts in Tor: a stream, and an edge connection. From the Tor protocol's point of view, a stream is a bi-directional channel that is multiplexed on a single circuit. Each stream on a circuit is identified with a separate 16-bit stream ID, local to the (circuit,exit) pair. Streams are created in response to client requests.
An edge connection is one thing that can implement a stream: it is either a TCP application socket that has arrived via (e.g.) a SOCKS request, or an exit connection.
Not every instance of edge_connection_t truly represents an edge connection, however. (Sorry!) We also create edge_connection_t objects for streams that we will not be handling with TCP. The types of these streams are:
This module handles general-purpose functionality having to do with edge_connection_t. On the client side, it accepts various types of application requests on SocksPorts, TransPorts, and NATDPorts, and creates streams appropriately.
This module is also responsible for implementing stream isolation: ensuring that streams that should not be linkable to one another are kept to different circuits.
On the exit side, this module handles the various stream-creating type of RELAY cells by launching appropriate outgoing connections, DNS requests, or directory connection objects.
And for all edge connections, this module is responsible for handling incoming and outdoing data as it arrives or leaves in the relay.c module. (Outgoing data will be packaged in connection_edge_process_inbuf() as it calls connection_edge_package_raw_inbuf(); incoming data from RELAY_DATA cells is applied in connection_edge_process_relay_cell().)
Definition in file connection_edge.c.
| #define CONNECTION_EDGE_PRIVATE |
Definition at line 56 of file connection_edge.c.
| #define MAX_CONNECTED_CELL_PAYLOAD_LEN 25 |
Longest size for the relay payload of a RELAY_CONNECTED cell that we're able to generate.
Definition at line 937 of file connection_edge.c.
| #define SOCKS4_GRANTED 90 |
Definition at line 164 of file connection_edge.c.
| #define SOCKS4_REJECT 91 |
Definition at line 165 of file connection_edge.c.
| #define TRACKHOSTEXITS_RETRIES 5 |
How many times do we try connecting with an exit configured via TrackHostExits before concluding that it won't work any more and trying a different one?
Definition at line 1770 of file connection_edge.c.
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Definition at line 1417 of file connection_edge.c.
Read a RELAY_BEGIN or RELAY_BEGIN_DIR cell from cell, decode it, and place the result in bcell. On success return 0; on failure return <0 and set *end_reason_out to the end reason we should send back to the client.
Return -1 in the case where we want to send a RELAY_END cell, and < -1 when we don't.
Definition at line 3819 of file connection_edge.c.
| void circuit_clear_isolation | ( | origin_circuit_t * | circ | ) |
Clear the isolation settings on circ.
This only works on an open circuit that has never had a stream attached to it, and whose isolation settings are hypothetical. (We set hypothetical isolation settings on circuits as we're launching them, so that we know whether they can handle more streams or whether we need to launch even more circuits. Once the circuit is open, if it turns out that we no longer have any streams to attach to it, we clear the isolation flags and data so that other streams can have a chance.)
Definition at line 4821 of file connection_edge.c.
Referenced by circuit_try_clearing_isolation_state().
| void circuit_discard_optional_exit_enclaves | ( | extend_info_t * | info | ) |
A circuit failed to finish on its last hop info. If there are any streams waiting with this exit node in mind, but they don't absolutely require it, make them give up on it.
Definition at line 1558 of file connection_edge.c.
| uint32_t clip_dns_fuzzy_ttl | ( | uint32_t | ttl | ) |
Given a TTL (in seconds), determine what TTL an exit relay should use by first clipping as usual and then adding some randomness which is sampled uniformly at random from [-FUZZY_DNS_TTL, FUZZY_DNS_TTL]. This facilitates fuzzy TTLs, which makes it harder to infer when a website was visited via side-channels like DNS (see "Website Fingerprinting with Website Oracles").
Note that this can't underflow because FUZZY_DNS_TTL < MIN_DNS_TTL.
Definition at line 500 of file connection_edge.c.
| uint32_t clip_dns_ttl | ( | uint32_t | ttl | ) |
Given a TTL (in seconds) from a DNS response or from a relay, determine what TTL clients and relays should actually use for caching it.
Definition at line 479 of file connection_edge.c.
Referenced by client_dns_set_addressmap_impl(), and clip_dns_fuzzy_ttl().
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Define a schedule for how long to wait between retrying application connections. Rather than waiting a fixed amount of time between each retry, we wait 10 seconds each for the first two tries, and 15 seconds for each retry after that. Hopefully this will improve the expected user experience.
Definition at line 1167 of file connection_edge.c.
| STATIC int connected_cell_format_payload | ( | uint8_t * | payload_out, |
| const tor_addr_t * | addr, | ||
| uint32_t | ttl | ||
| ) |
Set the buffer at payload_out – which must have at least MAX_CONNECTED_CELL_PAYLOAD_LEN bytes available – to the body of a RELAY_CONNECTED cell indicating that we have connected to addr, and that the name resolution that led us to addr will be valid for ttl seconds. Return -1 on error, or the number of bytes used on success.
Definition at line 946 of file connection_edge.c.
| void connection_ap_about_to_close | ( | entry_connection_t * | entry_conn | ) |
Called when we're about to finally unlink and free an AP (client) connection: perform necessary accounting and cleanup
Definition at line 1095 of file connection_edge.c.
Referenced by connection_about_to_close_connection().
| void connection_ap_attach_pending | ( | int | retry | ) |
Tell any AP streams that are listed as waiting for a new circuit to try again. If there is an available circuit for a stream, attach it. Otherwise, launch a new circuit.
If retry is false, only check the list if it contains at least one streams that we have not yet tried to attach to a circuit.
Definition at line 1354 of file connection_edge.c.
Referenced by circuit_try_attaching_streams().
| int connection_ap_can_use_exit | ( | const entry_connection_t * | conn, |
| const node_t * | exit_node | ||
| ) |
Return 1 if router exit_node is likely to allow stream conn to exit from it, or 0 if it probably will not allow it. (We might be uncertain if conn's destination address has not yet been resolved.)
Definition at line 4589 of file connection_edge.c.
| int connection_ap_detach_retriable | ( | entry_connection_t * | conn, |
| origin_circuit_t * | circ, | ||
| int | reason | ||
| ) |
The AP connection conn has just failed while attaching or sending a BEGIN or resolving on circ, but another circuit might work. Detach the circuit, and either reattach it, launch a new circuit, tell the controller, or give up as appropriate.
Returns -1 on err, 1 on success, 0 on not-yet-sure.
Definition at line 1619 of file connection_edge.c.
| void connection_ap_expire_beginning | ( | void | ) |
Find all general-purpose AP streams waiting for a response that sent their begin/resolve cell too long ago. Detach from their current circuit, and mark their current circuit as unsuitable for new streams. Then call connection_ap_handshake_attach_circuit() to attach to a new circuit (if available) or launch a new one.
For rendezvous streams, simply give up after SocksTimeout seconds (with no retry attempt).
Definition at line 1187 of file connection_edge.c.
Referenced by second_elapsed_callback().
| void connection_ap_fail_onehop | ( | const char * | failed_digest, |
| cpath_build_state_t * | build_state | ||
| ) |
Tell any AP streams that are waiting for a one-hop tunnel to failed_digest that they are going to fail.
Definition at line 1517 of file connection_edge.c.
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Return a bitmask of BEGIN_FLAG_* flags that we should transmit in the RELAY_BEGIN cell for ap_conn.
Definition at line 3175 of file connection_edge.c.
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Fetch the original destination address and port from a system-specific interface and put them into a socks_request_t as if they came from a socks request.
Return -1 if an error prevents fetching the destination, else return 0.
Definition at line 2780 of file connection_edge.c.
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We just received a SOCKS request in conn to a v3 onion. Start connecting to the onion service.
Definition at line 1996 of file connection_edge.c.
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connection_edge_process_inbuf() found a conn in state socks_wait. See if conn->inbuf has the right bytes to proceed with the socks handshake.
If the handshake is complete, send it to connection_ap_handshake_rewrite_and_attach().
Return -1 if an unexpected error with conn occurs (and mark it for close), else return 0.
Definition at line 2820 of file connection_edge.c.
Referenced by connection_edge_process_inbuf().
| STATIC void connection_ap_handshake_rewrite | ( | entry_connection_t * | conn, |
| rewrite_result_t * | out | ||
| ) |
Definition at line 1797 of file connection_edge.c.
| int connection_ap_handshake_rewrite_and_attach | ( | entry_connection_t * | conn, |
| origin_circuit_t * | circ, | ||
| crypt_path_t * | cpath | ||
| ) |
Connection conn just finished its socks handshake, or the controller asked us to take care of it. If circ is defined, then that's where we'll want to attach it. Otherwise we have to figure it out ourselves.
First, parse whether it's a .exit address, remap it, and so on. Then if it's for a general circuit, try to attach it to a circuit (or launch one as needed), else if it's for a rendezvous circuit, fetch a rendezvous descriptor first (or attach/launch a circuit if the rendezvous descriptor is already here and fresh enough).
The stream will exit from the hop indicated by cpath, or from the last hop in circ's cpath if cpath is NULL.
Definition at line 2143 of file connection_edge.c.
Referenced by connection_ap_rewrite_and_attach_if_allowed().
| int connection_ap_handshake_send_begin | ( | entry_connection_t * | ap_conn | ) |
Write a relay begin cell, using destaddr and destport from ap_conn's socks_request field, and send it down circ.
If ap_conn is broken, mark it for close and return -1. Else return 0.
Definition at line 3239 of file connection_edge.c.
Referenced by connection_ap_handshake_attach_chosen_circuit().
| int connection_ap_handshake_send_resolve | ( | entry_connection_t * | ap_conn | ) |
Write a relay resolve cell, using destaddr and destport from ap_conn's socks_request field, and send it down circ.
If ap_conn is broken, mark it for close and return -1. Else return 0.
Definition at line 3360 of file connection_edge.c.
Referenced by connection_ap_handshake_attach_chosen_circuit().
| void connection_ap_handshake_socks_reply | ( | entry_connection_t * | conn, |
| char * | reply, | ||
| size_t | replylen, | ||
| int | endreason | ||
| ) |
Send a socks reply to stream conn, using the appropriate socks version, etc, and mark conn as completed with SOCKS handshaking.
If reply is defined, then write replylen bytes of it to conn and return, else reply based on endreason (one of END_STREAM_REASON_*). If reply is undefined, endreason can't be 0 or REASON_DONE. Send endreason to the controller, if appropriate.
Definition at line 3708 of file connection_edge.c.
| void connection_ap_handshake_socks_resolved | ( | entry_connection_t * | conn, |
| int | answer_type, | ||
| size_t | answer_len, | ||
| const uint8_t * | answer, | ||
| int | ttl, | ||
| time_t | expires | ||
| ) |
Send an answer to an AP connection that has requested a DNS lookup via SOCKS. The type should be one of RESOLVED_TYPE_(IPV4|IPV6|HOSTNAME) or -1 for unreachable; the answer should be in the format specified in the socks extensions document. ttl is the ttl for the answer, or -1 on certain errors or for values that didn't come via DNS. expires is a time when the answer expires, or -1 or TIME_MAX if there's a good TTL.
Definition at line 3595 of file connection_edge.c.
Referenced by connection_ap_handshake_socks_resolved_addr().
| void connection_ap_handshake_socks_resolved_addr | ( | entry_connection_t * | conn, |
| const tor_addr_t * | answer, | ||
| int | ttl, | ||
| time_t | expires | ||
| ) |
As connection_ap_handshake_socks_resolved, but take a tor_addr_t to send as the answer.
Definition at line 3557 of file connection_edge.c.
| entry_connection_t * connection_ap_make_link | ( | connection_t * | partner, |
| char * | address, | ||
| uint16_t | port, | ||
| const char * | digest, | ||
| int | session_group, | ||
| int | isolation_flags, | ||
| int | use_begindir, | ||
| int | want_onehop | ||
| ) |
Make an AP connection_t linked to the connection_t partner. make a new linked connection pair, and attach one side to the conn, connection_add it, initialize it to circuit_wait, and call connection_ap_handshake_attach_circuit(conn) on it.
Return the newly created end of the linked connection pair, or -1 if error.
Definition at line 3451 of file connection_edge.c.
| void connection_ap_mark_as_non_pending_circuit | ( | entry_connection_t * | entry_conn | ) |
Mark entry_conn as no longer waiting for a circuit.
Definition at line 1476 of file connection_edge.c.
Referenced by connection_ap_mark_as_waiting_for_renddesc().
| void connection_ap_mark_as_pending_circuit_ | ( | entry_connection_t * | entry_conn, |
| const char * | fname, | ||
| int | lineno | ||
| ) |
Mark entry_conn as needing to get attached to a circuit.
And entry_conn must be in AP_CONN_STATE_CIRCUIT_WAIT, should not already be pending a circuit. The circuit will get launched or the connection will get attached the next time we call connection_ap_attach_pending().
Definition at line 1432 of file connection_edge.c.
| void connection_ap_mark_as_waiting_for_renddesc | ( | entry_connection_t * | entry_conn | ) |
Mark entry_conn as waiting for a rendezvous descriptor. This function will remove the entry connection from the waiting for a circuit list (pending_entry_connections).
This pattern is used across the code base because a connection in state AP_CONN_STATE_RENDDESC_WAIT must not be in the pending list.
Definition at line 1490 of file connection_edge.c.
| STATIC int connection_ap_process_http_connect | ( | entry_connection_t * | conn | ) |
Called on an HTTP CONNECT entry connection when some bytes have arrived, but we have not yet received a full HTTP CONNECT request. Try to parse an HTTP CONNECT request from the connection's inbuf. On success, set up the connection's socks_request field and try to attach the connection. On failure, send an HTTP reply, and mark the connection.
Definition at line 3019 of file connection_edge.c.
Referenced by connection_edge_process_inbuf().
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connection_edge_process_inbuf() found a conn in state natd_wait. See if conn->inbuf has the right bytes to proceed. See FreeBSD's libalias(3) and ProxyEncodeTcpStream() in src/lib/libalias/alias_proxy.c for the encoding form of the original destination.
If the original destination is complete, send it to connection_ap_handshake_rewrite_and_attach().
Return -1 if an unexpected error with conn (and it should be marked for close), else return 0.
Definition at line 2922 of file connection_edge.c.
Referenced by connection_edge_process_inbuf().
| int connection_ap_process_transparent | ( | entry_connection_t * | conn | ) |
connection_init_accepted_conn() found a new trans AP conn. Get the original destination and send it to connection_ap_handshake_rewrite_and_attach().
Return -1 if an unexpected error with conn (and it should be marked for close), else return 0.
Definition at line 2882 of file connection_edge.c.
| void connection_ap_rescan_and_attach_pending | ( | void | ) |
As connection_ap_attach_pending, but first scans the entire connection array to see if any elements are missing.
Definition at line 1316 of file connection_edge.c.
| int connection_ap_rewrite_and_attach_if_allowed | ( | entry_connection_t * | conn, |
| origin_circuit_t * | circ, | ||
| crypt_path_t * | cpath | ||
| ) |
Call connection_ap_handshake_rewrite_and_attach() unless a controller asked us to leave streams unattached. Return 0 in that case.
See connection_ap_handshake_rewrite_and_attach()'s documentation for arguments and return value.
Definition at line 1781 of file connection_edge.c.
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Return true iff conn is linked to a circuit and configured to use an exit that supports optimistic data.
Definition at line 3154 of file connection_edge.c.
| void connection_ap_warn_and_unmark_if_pending_circ | ( | entry_connection_t * | entry_conn, |
| const char * | where | ||
| ) |
Definition at line 1500 of file connection_edge.c.
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Common code to connection_(ap|exit)_about_to_close.
Definition at line 1081 of file connection_edge.c.
Referenced by connection_ap_about_to_close(), and connection_exit_about_to_close().
| int connection_edge_compatible_with_circuit | ( | const entry_connection_t * | conn, |
| const origin_circuit_t * | circ | ||
| ) |
Return true iff none of the isolation flags and fields in conn should prevent it from being attached to circ.
Definition at line 4673 of file connection_edge.c.
| int connection_edge_destroy | ( | circid_t | circ_id, |
| edge_connection_t * | conn | ||
| ) |
This edge needs to be closed, because its circuit has closed. Mark it for close and return 0.
Definition at line 400 of file connection_edge.c.
| int connection_edge_end | ( | edge_connection_t * | conn, |
| uint8_t | reason | ||
| ) |
Send a relay end cell from stream conn down conn's circuit, and remember that we've done so. If this is not a client connection, set the relay end cell's reason for closing as reason.
Return -1 if this function has already been called on this conn, else return 0.
Definition at line 514 of file connection_edge.c.
Referenced by connection_edge_end_close(), and inform_pending_connections().
| void connection_edge_end_close | ( | edge_connection_t * | conn, |
| uint8_t | reason | ||
| ) |
Send an END and mark for close the given edge connection conn using the given reason that has to be a stream reason.
Note: We don't unattached the AP connection (if applicable) because we don't want to flush the remaining data. This function aims at ending everything quickly regardless of the connection state.
This function can't fail and does nothing if conn is NULL.
Definition at line 4863 of file connection_edge.c.
| int connection_edge_end_errno | ( | edge_connection_t * | conn | ) |
An error has just occurred on an operation on an edge connection conn. Extract the errno; convert it to an end reason, and send an appropriate relay end cell to the other end of the connection's circuit.
Definition at line 867 of file connection_edge.c.
| int connection_edge_finished_connecting | ( | edge_connection_t * | edge_conn | ) |
Connected handler for exit connections: start writing pending data, deliver 'CONNECTED' relay cells as appropriate, and check any pending data that may have been received.
Definition at line 1020 of file connection_edge.c.
Referenced by connection_finished_connecting().
| int connection_edge_finished_flushing | ( | edge_connection_t * | conn | ) |
Connection conn has finished writing and has no bytes left on its outbuf.
If it's in state 'open', stop writing, consider responding with a sendme, and return. Otherwise, stop writing and return.
If conn is broken, mark it for close and return -1, else return 0.
Definition at line 908 of file connection_edge.c.
Referenced by connection_finished_flushing().
| int connection_edge_flushed_some | ( | edge_connection_t * | conn | ) |
We just wrote some data to conn; act appropriately.
(That is, if it's open, consider sending a stream-level sendme cell if we have just flushed enough.)
Definition at line 881 of file connection_edge.c.
| void connection_edge_free_all | ( | void | ) |
Free all storage held in module-scoped variables for connection_edge.c
Definition at line 4875 of file connection_edge.c.
| int connection_edge_is_rendezvous_stream | ( | const edge_connection_t * | conn | ) |
Return 1 if conn is a rendezvous stream, or 0 if it is a general stream.
Definition at line 4573 of file connection_edge.c.
Referenced by ap_stream_wants_exit_attention(), connection_exit_connect(), hs_client_note_connection_attempt_succeeded(), and write_stream_target_to_buf().
| int connection_edge_process_inbuf | ( | edge_connection_t * | conn, |
| int | package_partial | ||
| ) |
Handle new bytes on conn->inbuf based on state:
Mark and return -1 if there was an unexpected error with the conn, else return 0.
Definition at line 326 of file connection_edge.c.
Referenced by connection_process_inbuf().
| int connection_edge_reached_eof | ( | edge_connection_t * | conn | ) |
There was an EOF. Send an end and mark the connection for close.
Definition at line 292 of file connection_edge.c.
Referenced by connection_reached_eof().
| int connection_edge_update_circuit_isolation | ( | const entry_connection_t * | conn, |
| origin_circuit_t * | circ, | ||
| int | dry_run | ||
| ) |
If dry_run is false, update circ's isolation flags and fields to reflect having had conn attached to it, and return 0. Otherwise, if dry_run is true, then make no changes to circ, and return a bitfield of isolation flags that we would have to set in isolation_flags_mixed to add conn to circ, or -1 if circ has had no streams attached to it.
Definition at line 4743 of file connection_edge.c.
| void connection_entry_set_controller_wait | ( | entry_connection_t * | conn | ) |
Set the connection state to CONTROLLER_WAIT and send an control port event.
Definition at line 1604 of file connection_edge.c.
Referenced by connection_ap_rewrite_and_attach_if_allowed().
| void connection_exit_about_to_close | ( | edge_connection_t * | edge_conn | ) |
Called when we're about to finally unlink and free an exit connection: perform necessary accounting and cleanup
Definition at line 1146 of file connection_edge.c.
Referenced by connection_about_to_close_connection().
A relay 'begin' or 'begin_dir' cell has arrived, and either we are an exit hop for the circuit, or we are the origin and it is a rendezvous begin.
Launch a new exit connection and initialize things appropriately.
If it's a rendezvous stream, call connection_exit_connect() on it.
For general streams, call dns_resolve() on it first, and only call connection_exit_connect() if the dns answer is already known.
Note that we don't call connection_add() on the new stream! We wait for connection_exit_connect() to do that.
Return -(some circuit end reason) if we want to tear down circ. Else return 0.
Definition at line 3981 of file connection_edge.c.
| int connection_exit_begin_resolve | ( | cell_t * | cell, |
| or_circuit_t * | circ | ||
| ) |
Called when we receive a RELAY_COMMAND_RESOLVE cell 'cell' along the circuit circ; begin resolving the hostname, and (eventually) reply with a RESOLVED cell.
Return -(some circuit end reason) if we want to tear down circ. Else return 0.
Definition at line 4199 of file connection_edge.c.
| void connection_exit_connect | ( | edge_connection_t * | edge_conn | ) |
Connect to conn's specified addr and port. If it worked, conn has now been added to the connection_array.
Send back a connected cell. Include the resolved IP of the destination address, but only if it's a general exit stream. (Rendezvous streams must not reveal what IP they connected to.)
Definition at line 4365 of file connection_edge.c.
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Given an exit conn that should attach to us as a directory server, open a bridge connection with a linked connection pair, create a new directory conn, and join them together. Return 0 on success (or if there was an error we could send back an end cell for). Return -(some circuit end reason) if the circuit needs to be torn down. Either connects exitconn, frees it, or marks it, as appropriate.
Definition at line 4510 of file connection_edge.c.
| STATIC void connection_half_edge_add | ( | const edge_connection_t * | conn, |
| origin_circuit_t * | circ | ||
| ) |
Add a half-closed connection to the list, to watch for activity.
These connections are removed from the list upon receiving an end cell.
Definition at line 613 of file connection_edge.c.
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Helper function for bsearch.
As per smartlist_bsearch, return < 0 if key precedes member,
0 if member precedes key, and 0 if they are equal.
This is equivalent to subtraction of the values of key - member (why does no one ever say that explicitly?).
Definition at line 593 of file connection_edge.c.
Referenced by connection_half_edge_find_stream_id(), and connection_half_edge_is_valid_end().
| STATIC half_edge_t * connection_half_edge_find_stream_id | ( | const smartlist_t * | half_conns, |
| streamid_t | stream_id | ||
| ) |
Find a stream_id_t in the list in O(lg(n)).
Returns NULL if the list is empty or element is not found. Returns a pointer to the element if found.
Definition at line 723 of file connection_edge.c.
Referenced by connection_half_edge_add(), connection_half_edge_is_valid_connected(), connection_half_edge_is_valid_data(), and connection_half_edge_is_valid_sendme().
| int connection_half_edge_is_valid_connected | ( | const smartlist_t * | half_conns, |
| streamid_t | stream_id | ||
| ) |
Check if this stream_id is in a half-closed state. If so, check if it still has a connected cell pending, and decrement that window if so.
Return 1 if the connected window was not empty. Return 0 otherwise.
Definition at line 774 of file connection_edge.c.
| int connection_half_edge_is_valid_data | ( | const smartlist_t * | half_conns, |
| streamid_t | stream_id | ||
| ) |
Check if this stream_id is in a half-closed state. If so, check if it still has data cells pending, and decrement that window if so.
Return 1 if the data window was not empty. Return 0 otherwise.
Definition at line 742 of file connection_edge.c.
| int connection_half_edge_is_valid_end | ( | smartlist_t * | half_conns, |
| streamid_t | stream_id | ||
| ) |
Check if this stream_id is in a half-closed state. If so, remove it from the list. No other data should come after the END cell.
Return 1 if stream_id was in half-closed state. Return 0 otherwise.
Definition at line 829 of file connection_edge.c.
Referenced by connection_half_edge_is_valid_resolved().
| int connection_half_edge_is_valid_resolved | ( | smartlist_t * | half_conns, |
| streamid_t | stream_id | ||
| ) |
Streams that were used to send a RESOLVE cell are closed when they get the RESOLVED, without an end. So treat a RESOLVED just like an end, and remove from the list.
Definition at line 856 of file connection_edge.c.
| int connection_half_edge_is_valid_sendme | ( | const smartlist_t * | half_conns, |
| streamid_t | stream_id | ||
| ) |
Check if this stream_id is in a half-closed state. If so, check if it still has sendme cells pending, and decrement that window if so.
Return 1 if the sendme window was not empty. Return 0 otherwise.
Definition at line 800 of file connection_edge.c.
| bool connection_half_edges_waiting | ( | const origin_circuit_t * | circ | ) |
Return true if the circuit has any half-closed connections that are still within the end_ack_expected_usec timestamp from now.
Definition at line 686 of file connection_edge.c.
Referenced by circuit_expire_old_circuits_clientside().
| void connection_mark_unattached_ap_ | ( | entry_connection_t * | conn, |
| int | endreason, | ||
| int | line, | ||
| const char * | file | ||
| ) |
An AP stream has failed/finished. If it hasn't already sent back a socks reply, send one now (based on endreason). Also set has_sent_end to 1, and mark the conn.
Definition at line 256 of file connection_edge.c.
| void connection_reapply_exit_policy | ( | config_line_t * | changes | ) |
Definition at line 4283 of file connection_edge.c.
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Check if conn is using a dangerous port. Then warn and/or reject depending on our config options.
Definition at line 1651 of file connection_edge.c.
| const entry_connection_t * CONST_EDGE_TO_ENTRY_CONN | ( | const edge_connection_t * | c | ) |
Cast a const edge_connection_t * to a const entry_connection_t *.
Exit with an assertion failure if the input is not an entry_connection_t.
Definition at line 245 of file connection_edge.c.
| const edge_connection_t * CONST_TO_EDGE_CONN | ( | const connection_t * | c | ) |
Cast a const connection_t * to a const edge_connection_t *.
Exit with an assertion failure if the input is not an edge_connection_t.
Definition at line 195 of file connection_edge.c.
| const entry_connection_t * CONST_TO_ENTRY_CONN | ( | const connection_t * | c | ) |
Cast a const connection_t * to a const entry_connection_t *.
Exit with an assertion failure if the input is not an entry_connection_t.
Definition at line 220 of file connection_edge.c.
| entry_connection_t * EDGE_TO_ENTRY_CONN | ( | edge_connection_t * | c | ) |
Cast an edge_connection_t * to an entry_connection_t *.
Exit with an assertion failure if the input is not an entry_connection_t.
Definition at line 232 of file connection_edge.c.
Referenced by circuit_detach_stream(), connection_edge_process_inbuf(), connection_edge_process_resolved_cell(), CONST_EDGE_TO_ENTRY_CONN(), and socks_mark_rend_circuit_timed_out().
| STATIC void export_hs_client_circuit_id | ( | edge_connection_t * | edge_conn, |
| hs_circuit_id_protocol_t | protocol | ||
| ) |
Definition at line 979 of file connection_edge.c.
| streamid_t get_unique_stream_id_by_circ | ( | origin_circuit_t * | circ | ) |
Iterate over the two bytes of stream_id until we get one that is not already in use; return it. Return 0 if can't get a unique stream_id.
Definition at line 3121 of file connection_edge.c.
| void half_edge_free_ | ( | half_edge_t * | he | ) |
Release space held by he
Definition at line 701 of file connection_edge.c.
| size_t half_streams_get_total_allocation | ( | void | ) |
Return the number of bytes devoted to storing info on half-open streams.
Definition at line 711 of file connection_edge.c.
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For the given circ and the edge connection conn, setup the connection, attach it to the circ and connect it. Return 0 on success or END_CIRC_AT_ORIGIN if we can't find the requested hidden service port where the caller should close the circuit.
Definition at line 3879 of file connection_edge.c.
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Return true iff the (possibly NULL) alen-byte chunk of memory at a is equal to the (possibly NULL) blen-byte chunk of memory at b.
Definition at line 4655 of file connection_edge.c.
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Helper: Return true and set *why_rejected to an optional clarifying message message iff we do not allow connections to addr:port.
Definition at line 4264 of file connection_edge.c.
Referenced by connection_exit_connect().
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Return true iff the consensus allows network reentry. The default value is false if the parameter is not found.
Definition at line 4351 of file connection_edge.c.
| STATIC bool parse_extended_hostname | ( | char * | address, |
| hostname_type_t * | type_out | ||
| ) |
Parse the given hostname in address. Returns true if the parsing was successful and type_out contains the type of the hostname. Else, false is returned which means it was not recognized and type_out is set to BAD_HOSTNAME.
The possible recognized forms are (where true is returned):
If address is of the form "y.onion" with a well-formed handle y: Put a NUL after y, lower-case it, and return ONION_V3_HOSTNAME depending on the HS version.
If address is of the form "x.y.onion" with a well-formed handle x: Drop "x.", put a NUL after y, lower-case it, and return ONION_V3_HOSTNAME depending on the HS version.
If address is of the form "y.onion" with a badly-formed handle y: Return BAD_HOSTNAME and log a message.
If address is of the form "y.exit": Put a NUL after y and return EXIT_HOSTNAME.
Otherwise: Return NORMAL_HOSTNAME and change nothing.
Definition at line 1700 of file connection_edge.c.
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Send a raw end cell to the stream with ID stream_id out over the circ towards the hop identified with cpath_layer. If this is not a client connection, set the relay end cell's reason for closing as reason
Definition at line 430 of file connection_edge.c.
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Notify any interested controller connections about a new hostname resolve or resolve error. Takes the same arguments as does connection_ap_handshake_socks_resolved().
Definition at line 3518 of file connection_edge.c.
| edge_connection_t * TO_EDGE_CONN | ( | connection_t * | c | ) |
Cast a connection_t * to an edge_connection_t *.
Exit with an assertion failure if the input is not an edge_connection_t.
Definition at line 181 of file connection_edge.c.
Referenced by ap_stream_wants_exit_attention(), conn_uses_flow_control(), connection_about_to_close_connection(), connection_add_impl(), connection_check_event(), connection_finished_connecting(), connection_finished_flushing(), connection_process_inbuf(), connection_reached_eof(), connection_read_bw_exhausted(), connection_start_reading(), connection_unlink(), CONST_TO_EDGE_CONN(), and reenable_blocked_connections_cb().
| entry_connection_t * TO_ENTRY_CONN | ( | connection_t * | c | ) |
Cast a connection_t * to an entry_connection_t *.
Exit with an assertion failure if the input is not an entry_connection_t.
Definition at line 207 of file connection_edge.c.
Referenced by ap_stream_wants_exit_attention(), circuit_discard_optional_exit_enclaves(), connection_about_to_close_connection(), connection_ap_expire_beginning(), connection_ap_fail_onehop(), CONST_TO_ENTRY_CONN(), directory_all_unreachable_cb(), and get_stream().
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Definition at line 456 of file connection_edge.c.
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Mainloop event to tell us to scan for pending connections that can be attached.
Definition at line 1077 of file connection_edge.c.
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Definition at line 2987 of file connection_edge.c.
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Total number of half_edge_t objects allocated
Definition at line 604 of file connection_edge.c.
Referenced by half_edge_free_(), and half_streams_get_total_allocation().
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A list of all the entry_connection_t * objects that are not marked for close, and are in AP_CONN_STATE_CIRCUIT_WAIT.
(Right now, we check in several places to make sure that this list is correct. When it's incorrect, we'll fix it, and log a BUG message.)
Definition at line 1069 of file connection_edge.c.
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Definition at line 1071 of file connection_edge.c.
1.9.4