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https://gitlab.torproject.org/tpo/core/tor.git
synced 2024-09-22 22:14:58 +02:00
d4354b506b
The OutboundBindAddress option is useful for making sure that all of your outbond connections use a given interface. But when connecting to 127.0.0.1 (or ::1 even) it's important to actually have the connection come _from_ localhost, since lots of programs running on localhost use the source address to authenticate that the connection is really coming from the same host. Our old code always bound to OutboundBindAddress, whether connecting to localhost or not. This would potentially break DNS servers on localhost, and socks proxies on localhost. This patch changes the behavior so that we only look at OutboundBindAddress when connecting to a non-loopback address.
3493 lines
115 KiB
C
3493 lines
115 KiB
C
/* Copyright (c) 2001 Matej Pfajfar.
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* Copyright (c) 2001-2004, Roger Dingledine.
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* Copyright (c) 2004-2006, Roger Dingledine, Nick Mathewson.
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* Copyright (c) 2007-2009, The Tor Project, Inc. */
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/* See LICENSE for licensing information */
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/**
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* \file connection.c
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* \brief General high-level functions to handle reading and writing
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* on connections.
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**/
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#include "or.h"
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static connection_t *connection_create_listener(
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struct sockaddr *listensockaddr,
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socklen_t listensocklen, int type,
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char* address);
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static void connection_init(time_t now, connection_t *conn, int type,
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int socket_family);
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static int connection_init_accepted_conn(connection_t *conn,
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uint8_t listener_type);
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static int connection_handle_listener_read(connection_t *conn, int new_type);
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static int connection_bucket_should_increase(int bucket,
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or_connection_t *conn);
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static int connection_finished_flushing(connection_t *conn);
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static int connection_flushed_some(connection_t *conn);
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static int connection_finished_connecting(connection_t *conn);
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static int connection_reached_eof(connection_t *conn);
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static int connection_read_to_buf(connection_t *conn, int *max_to_read,
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int *socket_error);
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static int connection_process_inbuf(connection_t *conn, int package_partial);
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static void client_check_address_changed(int sock);
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static void set_constrained_socket_buffers(int sock, int size);
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static const char *connection_proxy_state_to_string(int state);
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static int connection_read_https_proxy_response(connection_t *conn);
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static void connection_send_socks5_connect(connection_t *conn);
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/** The last IPv4 address that our network interface seemed to have been
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* binding to, in host order. We use this to detect when our IP changes. */
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static uint32_t last_interface_ip = 0;
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/** A list of uint32_ts for addresses we've used in outgoing connections.
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* Used to detect IP address changes. */
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static smartlist_t *outgoing_addrs = NULL;
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/**************************************************************/
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/**
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* Return the human-readable name for the connection type <b>type</b>
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*/
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const char *
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conn_type_to_string(int type)
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{
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static char buf[64];
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switch (type) {
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case CONN_TYPE_OR_LISTENER: return "OR listener";
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case CONN_TYPE_OR: return "OR";
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case CONN_TYPE_EXIT: return "Exit";
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case CONN_TYPE_AP_LISTENER: return "Socks listener";
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case CONN_TYPE_AP_TRANS_LISTENER:
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return "Transparent pf/netfilter listener";
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case CONN_TYPE_AP_NATD_LISTENER: return "Transparent natd listener";
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case CONN_TYPE_AP_DNS_LISTENER: return "DNS listener";
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case CONN_TYPE_AP: return "Socks";
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case CONN_TYPE_DIR_LISTENER: return "Directory listener";
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case CONN_TYPE_DIR: return "Directory";
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case CONN_TYPE_CPUWORKER: return "CPU worker";
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case CONN_TYPE_CONTROL_LISTENER: return "Control listener";
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case CONN_TYPE_CONTROL: return "Control";
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default:
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log_warn(LD_BUG, "unknown connection type %d", type);
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tor_snprintf(buf, sizeof(buf), "unknown [%d]", type);
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return buf;
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}
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}
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/**
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* Return the human-readable name for the connection state <b>state</b>
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* for the connection type <b>type</b>
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*/
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const char *
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conn_state_to_string(int type, int state)
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{
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static char buf[96];
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switch (type) {
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case CONN_TYPE_OR_LISTENER:
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case CONN_TYPE_AP_LISTENER:
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case CONN_TYPE_AP_TRANS_LISTENER:
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case CONN_TYPE_AP_NATD_LISTENER:
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case CONN_TYPE_AP_DNS_LISTENER:
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case CONN_TYPE_DIR_LISTENER:
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case CONN_TYPE_CONTROL_LISTENER:
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if (state == LISTENER_STATE_READY)
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return "ready";
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break;
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case CONN_TYPE_OR:
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switch (state) {
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case OR_CONN_STATE_CONNECTING: return "connect()ing";
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case OR_CONN_STATE_PROXY_HANDSHAKING: return "handshaking (proxy)";
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case OR_CONN_STATE_TLS_HANDSHAKING: return "handshaking (TLS)";
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case OR_CONN_STATE_TLS_CLIENT_RENEGOTIATING:
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return "renegotiating (TLS)";
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case OR_CONN_STATE_TLS_SERVER_RENEGOTIATING:
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return "waiting for renegotiation (TLS)";
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case OR_CONN_STATE_OR_HANDSHAKING: return "handshaking (Tor)";
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case OR_CONN_STATE_OPEN: return "open";
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}
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break;
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case CONN_TYPE_EXIT:
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switch (state) {
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case EXIT_CONN_STATE_RESOLVING: return "waiting for dest info";
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case EXIT_CONN_STATE_CONNECTING: return "connecting";
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case EXIT_CONN_STATE_OPEN: return "open";
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case EXIT_CONN_STATE_RESOLVEFAILED: return "resolve failed";
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}
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break;
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case CONN_TYPE_AP:
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switch (state) {
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case AP_CONN_STATE_SOCKS_WAIT: return "waiting for socks info";
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case AP_CONN_STATE_NATD_WAIT: return "waiting for natd dest info";
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case AP_CONN_STATE_RENDDESC_WAIT: return "waiting for rendezvous desc";
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case AP_CONN_STATE_CONTROLLER_WAIT: return "waiting for controller";
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case AP_CONN_STATE_CIRCUIT_WAIT: return "waiting for circuit";
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case AP_CONN_STATE_CONNECT_WAIT: return "waiting for connect response";
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case AP_CONN_STATE_RESOLVE_WAIT: return "waiting for resolve response";
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case AP_CONN_STATE_OPEN: return "open";
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}
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break;
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case CONN_TYPE_DIR:
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switch (state) {
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case DIR_CONN_STATE_CONNECTING: return "connecting";
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case DIR_CONN_STATE_CLIENT_SENDING: return "client sending";
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case DIR_CONN_STATE_CLIENT_READING: return "client reading";
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case DIR_CONN_STATE_CLIENT_FINISHED: return "client finished";
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case DIR_CONN_STATE_SERVER_COMMAND_WAIT: return "waiting for command";
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case DIR_CONN_STATE_SERVER_WRITING: return "writing";
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}
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break;
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case CONN_TYPE_CPUWORKER:
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switch (state) {
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case CPUWORKER_STATE_IDLE: return "idle";
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case CPUWORKER_STATE_BUSY_ONION: return "busy with onion";
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}
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break;
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case CONN_TYPE_CONTROL:
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switch (state) {
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case CONTROL_CONN_STATE_OPEN: return "open (protocol v1)";
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case CONTROL_CONN_STATE_NEEDAUTH:
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return "waiting for authentication (protocol v1)";
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}
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break;
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}
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log_warn(LD_BUG, "unknown connection state %d (type %d)", state, type);
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tor_snprintf(buf, sizeof(buf),
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"unknown state [%d] on unknown [%s] connection",
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state, conn_type_to_string(type));
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return buf;
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}
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/** Allocate and return a new dir_connection_t, initialized as by
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* connection_init(). */
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dir_connection_t *
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dir_connection_new(int socket_family)
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{
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dir_connection_t *dir_conn = tor_malloc_zero(sizeof(dir_connection_t));
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connection_init(time(NULL), TO_CONN(dir_conn), CONN_TYPE_DIR, socket_family);
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return dir_conn;
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}
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/** Allocate and return a new or_connection_t, initialized as by
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* connection_init(). */
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or_connection_t *
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or_connection_new(int socket_family)
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{
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or_connection_t *or_conn = tor_malloc_zero(sizeof(or_connection_t));
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time_t now = time(NULL);
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connection_init(now, TO_CONN(or_conn), CONN_TYPE_OR, socket_family);
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or_conn->timestamp_last_added_nonpadding = time(NULL);
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or_conn->next_circ_id = crypto_rand_int(1<<15);
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or_conn->active_circuit_pqueue = smartlist_create();
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or_conn->active_circuit_pqueue_last_recalibrated = cell_ewma_get_tick();
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return or_conn;
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}
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/** Allocate and return a new edge_connection_t, initialized as by
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* connection_init(). */
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edge_connection_t *
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edge_connection_new(int type, int socket_family)
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{
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edge_connection_t *edge_conn = tor_malloc_zero(sizeof(edge_connection_t));
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tor_assert(type == CONN_TYPE_EXIT || type == CONN_TYPE_AP);
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connection_init(time(NULL), TO_CONN(edge_conn), type, socket_family);
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if (type == CONN_TYPE_AP)
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edge_conn->socks_request = tor_malloc_zero(sizeof(socks_request_t));
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return edge_conn;
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}
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/** Allocate and return a new control_connection_t, initialized as by
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* connection_init(). */
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control_connection_t *
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control_connection_new(int socket_family)
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{
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control_connection_t *control_conn =
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tor_malloc_zero(sizeof(control_connection_t));
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connection_init(time(NULL),
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TO_CONN(control_conn), CONN_TYPE_CONTROL, socket_family);
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log_notice(LD_CONTROL, "New control connection opened.");
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return control_conn;
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}
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/** Allocate, initialize, and return a new connection_t subtype of <b>type</b>
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* to make or receive connections of address family <b>socket_family</b>. The
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* type should be one of the CONN_TYPE_* constants. */
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connection_t *
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connection_new(int type, int socket_family)
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{
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switch (type) {
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case CONN_TYPE_OR:
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return TO_CONN(or_connection_new(socket_family));
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case CONN_TYPE_EXIT:
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case CONN_TYPE_AP:
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return TO_CONN(edge_connection_new(type, socket_family));
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case CONN_TYPE_DIR:
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return TO_CONN(dir_connection_new(socket_family));
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case CONN_TYPE_CONTROL:
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return TO_CONN(control_connection_new(socket_family));
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default: {
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connection_t *conn = tor_malloc_zero(sizeof(connection_t));
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connection_init(time(NULL), conn, type, socket_family);
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return conn;
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}
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}
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}
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/** Initializes conn. (you must call connection_add() to link it into the main
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* array).
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*
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* Set conn-\>type to <b>type</b>. Set conn-\>s and conn-\>conn_array_index to
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* -1 to signify they are not yet assigned.
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*
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* If conn is not a listener type, allocate buffers for it. If it's
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* an AP type, allocate space to store the socks_request.
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*
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* Assign a pseudorandom next_circ_id between 0 and 2**15.
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*
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* Initialize conn's timestamps to now.
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*/
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static void
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connection_init(time_t now, connection_t *conn, int type, int socket_family)
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{
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static uint64_t n_connections_allocated = 1;
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switch (type) {
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case CONN_TYPE_OR:
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conn->magic = OR_CONNECTION_MAGIC;
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break;
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case CONN_TYPE_EXIT:
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case CONN_TYPE_AP:
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conn->magic = EDGE_CONNECTION_MAGIC;
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break;
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case CONN_TYPE_DIR:
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conn->magic = DIR_CONNECTION_MAGIC;
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break;
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case CONN_TYPE_CONTROL:
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conn->magic = CONTROL_CONNECTION_MAGIC;
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break;
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default:
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conn->magic = BASE_CONNECTION_MAGIC;
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break;
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}
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conn->s = -1; /* give it a default of 'not used' */
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conn->conn_array_index = -1; /* also default to 'not used' */
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conn->global_identifier = n_connections_allocated++;
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conn->type = type;
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conn->socket_family = socket_family;
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if (!connection_is_listener(conn)) { /* listeners never use their buf */
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conn->inbuf = buf_new();
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conn->outbuf = buf_new();
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}
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conn->timestamp_created = now;
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conn->timestamp_lastread = now;
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conn->timestamp_lastwritten = now;
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}
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/** Create a link between <b>conn_a</b> and <b>conn_b</b>. */
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void
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connection_link_connections(connection_t *conn_a, connection_t *conn_b)
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{
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tor_assert(conn_a->s < 0);
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tor_assert(conn_b->s < 0);
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conn_a->linked = 1;
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conn_b->linked = 1;
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conn_a->linked_conn = conn_b;
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conn_b->linked_conn = conn_a;
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}
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/** Deallocate memory used by <b>conn</b>. Deallocate its buffers if
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* necessary, close its socket if necessary, and mark the directory as dirty
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* if <b>conn</b> is an OR or OP connection.
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*/
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static void
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_connection_free(connection_t *conn)
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{
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void *mem;
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size_t memlen;
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if (!conn)
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return;
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switch (conn->type) {
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case CONN_TYPE_OR:
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tor_assert(conn->magic == OR_CONNECTION_MAGIC);
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mem = TO_OR_CONN(conn);
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memlen = sizeof(or_connection_t);
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break;
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case CONN_TYPE_AP:
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case CONN_TYPE_EXIT:
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tor_assert(conn->magic == EDGE_CONNECTION_MAGIC);
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mem = TO_EDGE_CONN(conn);
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memlen = sizeof(edge_connection_t);
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break;
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case CONN_TYPE_DIR:
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tor_assert(conn->magic == DIR_CONNECTION_MAGIC);
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mem = TO_DIR_CONN(conn);
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memlen = sizeof(dir_connection_t);
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break;
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case CONN_TYPE_CONTROL:
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tor_assert(conn->magic == CONTROL_CONNECTION_MAGIC);
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mem = TO_CONTROL_CONN(conn);
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memlen = sizeof(control_connection_t);
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break;
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default:
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tor_assert(conn->magic == BASE_CONNECTION_MAGIC);
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mem = conn;
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memlen = sizeof(connection_t);
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break;
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}
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if (conn->linked) {
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log_info(LD_GENERAL, "Freeing linked %s connection [%s] with %d "
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"bytes on inbuf, %d on outbuf.",
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conn_type_to_string(conn->type),
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conn_state_to_string(conn->type, conn->state),
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(int)buf_datalen(conn->inbuf), (int)buf_datalen(conn->outbuf));
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}
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if (!connection_is_listener(conn)) {
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buf_free(conn->inbuf);
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buf_free(conn->outbuf);
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} else {
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if (conn->socket_family == AF_UNIX) {
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/* For now only control ports can be Unix domain sockets
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* and listeners at the same time */
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tor_assert(conn->type == CONN_TYPE_CONTROL_LISTENER);
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if (unlink(conn->address) < 0 && errno != ENOENT) {
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log_warn(LD_NET, "Could not unlink %s: %s", conn->address,
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strerror(errno));
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}
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}
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}
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tor_free(conn->address);
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if (connection_speaks_cells(conn)) {
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or_connection_t *or_conn = TO_OR_CONN(conn);
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tor_tls_free(or_conn->tls);
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or_conn->tls = NULL;
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or_handshake_state_free(or_conn->handshake_state);
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or_conn->handshake_state = NULL;
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smartlist_free(or_conn->active_circuit_pqueue);
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tor_free(or_conn->nickname);
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}
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if (CONN_IS_EDGE(conn)) {
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edge_connection_t *edge_conn = TO_EDGE_CONN(conn);
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tor_free(edge_conn->chosen_exit_name);
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if (edge_conn->socks_request) {
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memset(edge_conn->socks_request, 0xcc, sizeof(socks_request_t));
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tor_free(edge_conn->socks_request);
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}
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rend_data_free(edge_conn->rend_data);
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}
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if (conn->type == CONN_TYPE_CONTROL) {
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control_connection_t *control_conn = TO_CONTROL_CONN(conn);
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tor_free(control_conn->incoming_cmd);
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}
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tor_free(conn->read_event); /* Probably already freed by connection_free. */
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tor_free(conn->write_event); /* Probably already freed by connection_free. */
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if (conn->type == CONN_TYPE_DIR) {
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dir_connection_t *dir_conn = TO_DIR_CONN(conn);
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tor_free(dir_conn->requested_resource);
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tor_zlib_free(dir_conn->zlib_state);
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if (dir_conn->fingerprint_stack) {
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SMARTLIST_FOREACH(dir_conn->fingerprint_stack, char *, cp, tor_free(cp));
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smartlist_free(dir_conn->fingerprint_stack);
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}
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cached_dir_decref(dir_conn->cached_dir);
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rend_data_free(dir_conn->rend_data);
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}
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if (conn->s >= 0) {
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log_debug(LD_NET,"closing fd %d.",conn->s);
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tor_close_socket(conn->s);
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conn->s = -1;
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}
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if (conn->type == CONN_TYPE_OR &&
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!tor_digest_is_zero(TO_OR_CONN(conn)->identity_digest)) {
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log_warn(LD_BUG, "called on OR conn with non-zeroed identity_digest");
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connection_or_remove_from_identity_map(TO_OR_CONN(conn));
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}
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memset(mem, 0xCC, memlen); /* poison memory */
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tor_free(mem);
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}
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|
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/** Make sure <b>conn</b> isn't in any of the global conn lists; then free it.
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*/
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void
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connection_free(connection_t *conn)
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{
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if (!conn)
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return;
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tor_assert(!connection_is_on_closeable_list(conn));
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tor_assert(!connection_in_array(conn));
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if (conn->linked_conn) {
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log_err(LD_BUG, "Called with conn->linked_conn still set.");
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tor_fragile_assert();
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conn->linked_conn->linked_conn = NULL;
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if (! conn->linked_conn->marked_for_close &&
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conn->linked_conn->reading_from_linked_conn)
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connection_start_reading(conn->linked_conn);
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conn->linked_conn = NULL;
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}
|
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if (connection_speaks_cells(conn)) {
|
|
if (!tor_digest_is_zero(TO_OR_CONN(conn)->identity_digest)) {
|
|
connection_or_remove_from_identity_map(TO_OR_CONN(conn));
|
|
}
|
|
}
|
|
if (conn->type == CONN_TYPE_CONTROL) {
|
|
TO_CONTROL_CONN(conn)->event_mask = 0;
|
|
control_update_global_event_mask();
|
|
}
|
|
connection_unregister_events(conn);
|
|
_connection_free(conn);
|
|
}
|
|
|
|
/** Call _connection_free() on every connection in our array, and release all
|
|
* storage held by connection.c. This is used by cpuworkers and dnsworkers
|
|
* when they fork, so they don't keep resources held open (especially
|
|
* sockets).
|
|
*
|
|
* Don't do the checks in connection_free(), because they will
|
|
* fail.
|
|
*/
|
|
void
|
|
connection_free_all(void)
|
|
{
|
|
smartlist_t *conns = get_connection_array();
|
|
|
|
/* We don't want to log any messages to controllers. */
|
|
SMARTLIST_FOREACH(conns, connection_t *, conn,
|
|
if (conn->type == CONN_TYPE_CONTROL)
|
|
TO_CONTROL_CONN(conn)->event_mask = 0);
|
|
|
|
control_update_global_event_mask();
|
|
|
|
/* Unlink everything from the identity map. */
|
|
connection_or_clear_identity_map();
|
|
|
|
SMARTLIST_FOREACH(conns, connection_t *, conn, _connection_free(conn));
|
|
|
|
if (outgoing_addrs) {
|
|
SMARTLIST_FOREACH(outgoing_addrs, void*, addr, tor_free(addr));
|
|
smartlist_free(outgoing_addrs);
|
|
outgoing_addrs = NULL;
|
|
}
|
|
}
|
|
|
|
/** Do any cleanup needed:
|
|
* - Directory conns that failed to fetch a rendezvous descriptor
|
|
* need to inform pending rendezvous streams.
|
|
* - OR conns need to call rep_hist_note_*() to record status.
|
|
* - AP conns need to send a socks reject if necessary.
|
|
* - Exit conns need to call connection_dns_remove() if necessary.
|
|
* - AP and Exit conns need to send an end cell if they can.
|
|
* - DNS conns need to fail any resolves that are pending on them.
|
|
* - OR and edge connections need to be unlinked from circuits.
|
|
*/
|
|
void
|
|
connection_about_to_close_connection(connection_t *conn)
|
|
{
|
|
circuit_t *circ;
|
|
dir_connection_t *dir_conn;
|
|
or_connection_t *or_conn;
|
|
edge_connection_t *edge_conn;
|
|
time_t now = time(NULL);
|
|
|
|
tor_assert(conn->marked_for_close);
|
|
|
|
if (CONN_IS_EDGE(conn)) {
|
|
edge_conn = TO_EDGE_CONN(conn);
|
|
if (!edge_conn->edge_has_sent_end) {
|
|
log_warn(LD_BUG, "(Harmless.) Edge connection (marked at %s:%d) "
|
|
"hasn't sent end yet?",
|
|
conn->marked_for_close_file, conn->marked_for_close);
|
|
tor_fragile_assert();
|
|
}
|
|
}
|
|
|
|
switch (conn->type) {
|
|
case CONN_TYPE_DIR:
|
|
dir_conn = TO_DIR_CONN(conn);
|
|
if (conn->state < DIR_CONN_STATE_CLIENT_FINISHED) {
|
|
/* It's a directory connection and connecting or fetching
|
|
* failed: forget about this router, and maybe try again. */
|
|
connection_dir_request_failed(dir_conn);
|
|
}
|
|
/* If we were trying to fetch a v2 rend desc and did not succeed,
|
|
* retry as needed. (If a fetch is successful, the connection state
|
|
* is changed to DIR_PURPOSE_HAS_FETCHED_RENDDESC to mark that
|
|
* refetching is unnecessary.) */
|
|
if (conn->purpose == DIR_PURPOSE_FETCH_RENDDESC_V2 &&
|
|
dir_conn->rend_data &&
|
|
strlen(dir_conn->rend_data->onion_address) ==
|
|
REND_SERVICE_ID_LEN_BASE32)
|
|
rend_client_refetch_v2_renddesc(dir_conn->rend_data);
|
|
break;
|
|
case CONN_TYPE_OR:
|
|
or_conn = TO_OR_CONN(conn);
|
|
/* Remember why we're closing this connection. */
|
|
if (conn->state != OR_CONN_STATE_OPEN) {
|
|
/* Inform any pending (not attached) circs that they should
|
|
* give up. */
|
|
circuit_n_conn_done(TO_OR_CONN(conn), 0);
|
|
/* now mark things down as needed */
|
|
if (connection_or_nonopen_was_started_here(or_conn)) {
|
|
or_options_t *options = get_options();
|
|
rep_hist_note_connect_failed(or_conn->identity_digest, now);
|
|
entry_guard_register_connect_status(or_conn->identity_digest,0,
|
|
!options->HttpsProxy, now);
|
|
if (conn->state >= OR_CONN_STATE_TLS_HANDSHAKING) {
|
|
int reason = tls_error_to_orconn_end_reason(or_conn->tls_error);
|
|
control_event_or_conn_status(or_conn, OR_CONN_EVENT_FAILED,
|
|
reason);
|
|
if (!authdir_mode_tests_reachability(options))
|
|
control_event_bootstrap_problem(
|
|
orconn_end_reason_to_control_string(reason), reason);
|
|
}
|
|
}
|
|
} else if (conn->hold_open_until_flushed) {
|
|
/* We only set hold_open_until_flushed when we're intentionally
|
|
* closing a connection. */
|
|
rep_hist_note_disconnect(or_conn->identity_digest, now);
|
|
control_event_or_conn_status(or_conn, OR_CONN_EVENT_CLOSED,
|
|
tls_error_to_orconn_end_reason(or_conn->tls_error));
|
|
} else if (!tor_digest_is_zero(or_conn->identity_digest)) {
|
|
rep_hist_note_connection_died(or_conn->identity_digest, now);
|
|
control_event_or_conn_status(or_conn, OR_CONN_EVENT_CLOSED,
|
|
tls_error_to_orconn_end_reason(or_conn->tls_error));
|
|
}
|
|
/* Now close all the attached circuits on it. */
|
|
circuit_unlink_all_from_or_conn(TO_OR_CONN(conn),
|
|
END_CIRC_REASON_OR_CONN_CLOSED);
|
|
break;
|
|
case CONN_TYPE_AP:
|
|
edge_conn = TO_EDGE_CONN(conn);
|
|
if (edge_conn->socks_request->has_finished == 0) {
|
|
/* since conn gets removed right after this function finishes,
|
|
* there's no point trying to send back a reply at this point. */
|
|
log_warn(LD_BUG,"Closing stream (marked at %s:%d) without sending"
|
|
" back a socks reply.",
|
|
conn->marked_for_close_file, conn->marked_for_close);
|
|
}
|
|
if (!edge_conn->end_reason) {
|
|
log_warn(LD_BUG,"Closing stream (marked at %s:%d) without having"
|
|
" set end_reason.",
|
|
conn->marked_for_close_file, conn->marked_for_close);
|
|
}
|
|
if (edge_conn->dns_server_request) {
|
|
log_warn(LD_BUG,"Closing stream (marked at %s:%d) without having"
|
|
" replied to DNS request.",
|
|
conn->marked_for_close_file, conn->marked_for_close);
|
|
dnsserv_reject_request(edge_conn);
|
|
}
|
|
control_event_stream_bandwidth(edge_conn);
|
|
control_event_stream_status(edge_conn, STREAM_EVENT_CLOSED,
|
|
edge_conn->end_reason);
|
|
circ = circuit_get_by_edge_conn(edge_conn);
|
|
if (circ)
|
|
circuit_detach_stream(circ, edge_conn);
|
|
break;
|
|
case CONN_TYPE_EXIT:
|
|
edge_conn = TO_EDGE_CONN(conn);
|
|
circ = circuit_get_by_edge_conn(edge_conn);
|
|
if (circ)
|
|
circuit_detach_stream(circ, edge_conn);
|
|
if (conn->state == EXIT_CONN_STATE_RESOLVING) {
|
|
connection_dns_remove(edge_conn);
|
|
}
|
|
break;
|
|
}
|
|
}
|
|
|
|
/** Return true iff connection_close_immediate() has been called on this
|
|
* connection. */
|
|
#define CONN_IS_CLOSED(c) \
|
|
((c)->linked ? ((c)->linked_conn_is_closed) : ((c)->s < 0))
|
|
|
|
/** Close the underlying socket for <b>conn</b>, so we don't try to
|
|
* flush it. Must be used in conjunction with (right before)
|
|
* connection_mark_for_close().
|
|
*/
|
|
void
|
|
connection_close_immediate(connection_t *conn)
|
|
{
|
|
assert_connection_ok(conn,0);
|
|
if (CONN_IS_CLOSED(conn)) {
|
|
log_err(LD_BUG,"Attempt to close already-closed connection.");
|
|
tor_fragile_assert();
|
|
return;
|
|
}
|
|
if (conn->outbuf_flushlen) {
|
|
log_info(LD_NET,"fd %d, type %s, state %s, %d bytes on outbuf.",
|
|
conn->s, conn_type_to_string(conn->type),
|
|
conn_state_to_string(conn->type, conn->state),
|
|
(int)conn->outbuf_flushlen);
|
|
}
|
|
|
|
connection_unregister_events(conn);
|
|
|
|
if (conn->s >= 0)
|
|
tor_close_socket(conn->s);
|
|
conn->s = -1;
|
|
if (conn->linked)
|
|
conn->linked_conn_is_closed = 1;
|
|
if (!connection_is_listener(conn)) {
|
|
buf_clear(conn->outbuf);
|
|
conn->outbuf_flushlen = 0;
|
|
}
|
|
}
|
|
|
|
/** Mark <b>conn</b> to be closed next time we loop through
|
|
* conn_close_if_marked() in main.c. */
|
|
void
|
|
_connection_mark_for_close(connection_t *conn, int line, const char *file)
|
|
{
|
|
assert_connection_ok(conn,0);
|
|
tor_assert(line);
|
|
tor_assert(line < 1<<16); /* marked_for_close can only fit a uint16_t. */
|
|
tor_assert(file);
|
|
|
|
if (conn->marked_for_close) {
|
|
log(LOG_WARN,LD_BUG,"Duplicate call to connection_mark_for_close at %s:%d"
|
|
" (first at %s:%d)", file, line, conn->marked_for_close_file,
|
|
conn->marked_for_close);
|
|
tor_fragile_assert();
|
|
return;
|
|
}
|
|
|
|
conn->marked_for_close = line;
|
|
conn->marked_for_close_file = file;
|
|
add_connection_to_closeable_list(conn);
|
|
|
|
/* in case we're going to be held-open-til-flushed, reset
|
|
* the number of seconds since last successful write, so
|
|
* we get our whole 15 seconds */
|
|
conn->timestamp_lastwritten = time(NULL);
|
|
}
|
|
|
|
/** Find each connection that has hold_open_until_flushed set to
|
|
* 1 but hasn't written in the past 15 seconds, and set
|
|
* hold_open_until_flushed to 0. This means it will get cleaned
|
|
* up in the next loop through close_if_marked() in main.c.
|
|
*/
|
|
void
|
|
connection_expire_held_open(void)
|
|
{
|
|
time_t now;
|
|
smartlist_t *conns = get_connection_array();
|
|
|
|
now = time(NULL);
|
|
|
|
SMARTLIST_FOREACH(conns, connection_t *, conn,
|
|
{
|
|
/* If we've been holding the connection open, but we haven't written
|
|
* for 15 seconds...
|
|
*/
|
|
if (conn->hold_open_until_flushed) {
|
|
tor_assert(conn->marked_for_close);
|
|
if (now - conn->timestamp_lastwritten >= 15) {
|
|
int severity;
|
|
if (conn->type == CONN_TYPE_EXIT ||
|
|
(conn->type == CONN_TYPE_DIR &&
|
|
conn->purpose == DIR_PURPOSE_SERVER))
|
|
severity = LOG_INFO;
|
|
else
|
|
severity = LOG_NOTICE;
|
|
log_fn(severity, LD_NET,
|
|
"Giving up on marked_for_close conn that's been flushing "
|
|
"for 15s (fd %d, type %s, state %s).",
|
|
conn->s, conn_type_to_string(conn->type),
|
|
conn_state_to_string(conn->type, conn->state));
|
|
conn->hold_open_until_flushed = 0;
|
|
}
|
|
}
|
|
});
|
|
}
|
|
|
|
/** Create an AF_INET listenaddr struct.
|
|
* <b>listenaddress</b> provides the host and optionally the port information
|
|
* for the new structure. If no port is provided in <b>listenaddress</b> then
|
|
* <b>listenport</b> is used.
|
|
*
|
|
* If not NULL <b>readable_address</b> will contain a copy of the host part of
|
|
* <b>listenaddress</b>.
|
|
*
|
|
* The listenaddr struct has to be freed by the caller.
|
|
*/
|
|
static struct sockaddr_in *
|
|
create_inet_sockaddr(const char *listenaddress, uint16_t listenport,
|
|
char **readable_address, socklen_t *socklen_out) {
|
|
struct sockaddr_in *listenaddr = NULL;
|
|
uint32_t addr;
|
|
uint16_t usePort = 0;
|
|
|
|
if (parse_addr_port(LOG_WARN,
|
|
listenaddress, readable_address, &addr, &usePort)<0) {
|
|
log_warn(LD_CONFIG,
|
|
"Error parsing/resolving ListenAddress %s", listenaddress);
|
|
goto err;
|
|
}
|
|
if (usePort==0)
|
|
usePort = listenport;
|
|
|
|
listenaddr = tor_malloc_zero(sizeof(struct sockaddr_in));
|
|
listenaddr->sin_addr.s_addr = htonl(addr);
|
|
listenaddr->sin_family = AF_INET;
|
|
listenaddr->sin_port = htons((uint16_t) usePort);
|
|
|
|
*socklen_out = sizeof(struct sockaddr_in);
|
|
|
|
return listenaddr;
|
|
|
|
err:
|
|
tor_free(listenaddr);
|
|
return NULL;
|
|
}
|
|
|
|
#ifdef HAVE_SYS_UN_H
|
|
/** Create an AF_UNIX listenaddr struct.
|
|
* <b>listenaddress</b> provides the path to the Unix socket.
|
|
*
|
|
* Eventually <b>listenaddress</b> will also optionally contain user, group,
|
|
* and file permissions for the new socket. But not yet. XXX
|
|
* Also, since we do not create the socket here the information doesn't help
|
|
* here.
|
|
*
|
|
* If not NULL <b>readable_address</b> will contain a copy of the path part of
|
|
* <b>listenaddress</b>.
|
|
*
|
|
* The listenaddr struct has to be freed by the caller.
|
|
*/
|
|
static struct sockaddr_un *
|
|
create_unix_sockaddr(const char *listenaddress, char **readable_address,
|
|
socklen_t *len_out)
|
|
{
|
|
struct sockaddr_un *sockaddr = NULL;
|
|
|
|
sockaddr = tor_malloc_zero(sizeof(struct sockaddr_un));
|
|
sockaddr->sun_family = AF_UNIX;
|
|
strncpy(sockaddr->sun_path, listenaddress, sizeof(sockaddr->sun_path));
|
|
|
|
if (readable_address)
|
|
*readable_address = tor_strdup(listenaddress);
|
|
|
|
*len_out = sizeof(struct sockaddr_un);
|
|
return sockaddr;
|
|
}
|
|
#else
|
|
static struct sockaddr *
|
|
create_unix_sockaddr(const char *listenaddress, char **readable_address,
|
|
socklen_t *len_out)
|
|
{
|
|
(void)listenaddress;
|
|
(void)readable_address;
|
|
log_fn(LOG_ERR, LD_BUG,
|
|
"Unix domain sockets not supported, yet we tried to create one.");
|
|
*len_out = 0;
|
|
tor_assert(0);
|
|
};
|
|
#endif /* HAVE_SYS_UN_H */
|
|
|
|
/** Warn that an accept or a connect has failed because we're running up
|
|
* against our ulimit. Rate-limit these warnings so that we don't spam
|
|
* the log. */
|
|
static void
|
|
warn_too_many_conns(void)
|
|
{
|
|
#define WARN_TOO_MANY_CONNS_INTERVAL (6*60*60)
|
|
static time_t last_warned = 0;
|
|
time_t now = time(NULL);
|
|
int n_conns = get_n_open_sockets();
|
|
if (last_warned + WARN_TOO_MANY_CONNS_INTERVAL < now) {
|
|
log_warn(LD_NET,"Failing because we have %d connections already. Please "
|
|
"raise your ulimit -n.", n_conns);
|
|
last_warned = now;
|
|
}
|
|
control_event_general_status(LOG_WARN, "TOO_MANY_CONNECTIONS CURRENT=%d",
|
|
n_conns);
|
|
}
|
|
|
|
/** Bind a new non-blocking socket listening to the socket described
|
|
* by <b>listensockaddr</b>.
|
|
*
|
|
* <b>address</b> is only used for logging purposes and to add the information
|
|
* to the conn.
|
|
*/
|
|
static connection_t *
|
|
connection_create_listener(struct sockaddr *listensockaddr, socklen_t socklen,
|
|
int type, char* address)
|
|
{
|
|
connection_t *conn;
|
|
int s; /* the socket we're going to make */
|
|
uint16_t usePort = 0;
|
|
int start_reading = 0;
|
|
|
|
if (get_n_open_sockets() >= get_options()->_ConnLimit-1) {
|
|
warn_too_many_conns();
|
|
return NULL;
|
|
}
|
|
|
|
if (listensockaddr->sa_family == AF_INET) {
|
|
int is_tcp = (type != CONN_TYPE_AP_DNS_LISTENER);
|
|
#ifndef MS_WINDOWS
|
|
int one=1;
|
|
#endif
|
|
if (is_tcp)
|
|
start_reading = 1;
|
|
|
|
usePort = ntohs( (uint16_t)
|
|
((struct sockaddr_in *)listensockaddr)->sin_port);
|
|
|
|
log_notice(LD_NET, "Opening %s on %s:%d",
|
|
conn_type_to_string(type), address, usePort);
|
|
|
|
s = tor_open_socket(PF_INET,
|
|
is_tcp ? SOCK_STREAM : SOCK_DGRAM,
|
|
is_tcp ? IPPROTO_TCP: IPPROTO_UDP);
|
|
if (s < 0) {
|
|
log_warn(LD_NET,"Socket creation failed.");
|
|
goto err;
|
|
}
|
|
|
|
#ifndef MS_WINDOWS
|
|
/* REUSEADDR on normal places means you can rebind to the port
|
|
* right after somebody else has let it go. But REUSEADDR on win32
|
|
* means you can bind to the port _even when somebody else
|
|
* already has it bound_. So, don't do that on Win32. */
|
|
setsockopt(s, SOL_SOCKET, SO_REUSEADDR, (void*) &one,
|
|
(socklen_t)sizeof(one));
|
|
#endif
|
|
|
|
if (bind(s,listensockaddr,socklen) < 0) {
|
|
const char *helpfulhint = "";
|
|
int e = tor_socket_errno(s);
|
|
if (ERRNO_IS_EADDRINUSE(e))
|
|
helpfulhint = ". Is Tor already running?";
|
|
log_warn(LD_NET, "Could not bind to %s:%u: %s%s", address, usePort,
|
|
tor_socket_strerror(e), helpfulhint);
|
|
tor_close_socket(s);
|
|
goto err;
|
|
}
|
|
|
|
if (is_tcp) {
|
|
if (listen(s,SOMAXCONN) < 0) {
|
|
log_warn(LD_NET, "Could not listen on %s:%u: %s", address, usePort,
|
|
tor_socket_strerror(tor_socket_errno(s)));
|
|
tor_close_socket(s);
|
|
goto err;
|
|
}
|
|
}
|
|
#ifdef HAVE_SYS_UN_H
|
|
} else if (listensockaddr->sa_family == AF_UNIX) {
|
|
start_reading = 1;
|
|
|
|
/* For now only control ports can be Unix domain sockets
|
|
* and listeners at the same time */
|
|
tor_assert(type == CONN_TYPE_CONTROL_LISTENER);
|
|
|
|
log_notice(LD_NET, "Opening %s on %s",
|
|
conn_type_to_string(type), address);
|
|
|
|
if (unlink(address) < 0 && errno != ENOENT) {
|
|
log_warn(LD_NET, "Could not unlink %s: %s", address,
|
|
strerror(errno));
|
|
goto err;
|
|
}
|
|
s = tor_open_socket(AF_UNIX, SOCK_STREAM, 0);
|
|
if (s < 0) {
|
|
log_warn(LD_NET,"Socket creation failed: %s.", strerror(errno));
|
|
goto err;
|
|
}
|
|
|
|
if (bind(s, listensockaddr, (socklen_t)sizeof(struct sockaddr_un)) == -1) {
|
|
log_warn(LD_NET,"Bind to %s failed: %s.", address,
|
|
tor_socket_strerror(tor_socket_errno(s)));
|
|
goto err;
|
|
}
|
|
|
|
if (listen(s,SOMAXCONN) < 0) {
|
|
log_warn(LD_NET, "Could not listen on %s: %s", address,
|
|
tor_socket_strerror(tor_socket_errno(s)));
|
|
tor_close_socket(s);
|
|
goto err;
|
|
}
|
|
#endif /* HAVE_SYS_UN_H */
|
|
} else {
|
|
log_err(LD_BUG,"Got unexpected address family %d.",
|
|
listensockaddr->sa_family);
|
|
tor_assert(0);
|
|
}
|
|
|
|
set_socket_nonblocking(s);
|
|
|
|
conn = connection_new(type, listensockaddr->sa_family);
|
|
conn->socket_family = listensockaddr->sa_family;
|
|
conn->s = s;
|
|
conn->address = tor_strdup(address);
|
|
conn->port = usePort;
|
|
|
|
if (connection_add(conn) < 0) { /* no space, forget it */
|
|
log_warn(LD_NET,"connection_add for listener failed. Giving up.");
|
|
connection_free(conn);
|
|
goto err;
|
|
}
|
|
|
|
log_debug(LD_NET,"%s listening on port %u.",
|
|
conn_type_to_string(type), usePort);
|
|
|
|
conn->state = LISTENER_STATE_READY;
|
|
if (start_reading) {
|
|
connection_start_reading(conn);
|
|
} else {
|
|
tor_assert(type == CONN_TYPE_AP_DNS_LISTENER);
|
|
dnsserv_configure_listener(conn);
|
|
}
|
|
|
|
return conn;
|
|
|
|
err:
|
|
return NULL;
|
|
}
|
|
|
|
/** Do basic sanity checking on a newly received socket. Return 0
|
|
* if it looks ok, else return -1. */
|
|
static int
|
|
check_sockaddr(struct sockaddr *sa, int len, int level)
|
|
{
|
|
int ok = 1;
|
|
|
|
if (sa->sa_family == AF_INET) {
|
|
struct sockaddr_in *sin=(struct sockaddr_in*)sa;
|
|
if (len != sizeof(struct sockaddr_in)) {
|
|
log_fn(level, LD_NET, "Length of address not as expected: %d vs %d",
|
|
len,(int)sizeof(struct sockaddr_in));
|
|
ok = 0;
|
|
}
|
|
if (sin->sin_addr.s_addr == 0 || sin->sin_port == 0) {
|
|
log_fn(level, LD_NET,
|
|
"Address for new connection has address/port equal to zero.");
|
|
ok = 0;
|
|
}
|
|
} else if (sa->sa_family == AF_INET6) {
|
|
struct sockaddr_in6 *sin6=(struct sockaddr_in6*)sa;
|
|
if (len != sizeof(struct sockaddr_in6)) {
|
|
log_fn(level, LD_NET, "Length of address not as expected: %d vs %d",
|
|
len,(int)sizeof(struct sockaddr_in6));
|
|
ok = 0;
|
|
}
|
|
if (tor_mem_is_zero((void*)sin6->sin6_addr.s6_addr, 16) ||
|
|
sin6->sin6_port == 0) {
|
|
log_fn(level, LD_NET,
|
|
"Address for new connection has address/port equal to zero.");
|
|
ok = 0;
|
|
}
|
|
} else {
|
|
ok = 0;
|
|
}
|
|
return ok ? 0 : -1;
|
|
}
|
|
|
|
/** Check whether the socket family from an accepted socket <b>got</b> is the
|
|
* same as the one that <b>listener</b> is waiting for. If it isn't, log
|
|
* a useful message and return -1. Else return 0.
|
|
*
|
|
* This is annoying, but can apparently happen on some Darwins. */
|
|
static int
|
|
check_sockaddr_family_match(sa_family_t got, connection_t *listener)
|
|
{
|
|
if (got != listener->socket_family) {
|
|
log_info(LD_BUG, "A listener connection returned a socket with a "
|
|
"mismatched family. %s for addr_family %d gave us a socket "
|
|
"with address family %d. Dropping.",
|
|
conn_type_to_string(listener->type),
|
|
(int)listener->socket_family,
|
|
(int)got);
|
|
return -1;
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
/** The listener connection <b>conn</b> told poll() it wanted to read.
|
|
* Call accept() on conn-\>s, and add the new connection if necessary.
|
|
*/
|
|
static int
|
|
connection_handle_listener_read(connection_t *conn, int new_type)
|
|
{
|
|
int news; /* the new socket */
|
|
connection_t *newconn;
|
|
/* information about the remote peer when connecting to other routers */
|
|
char addrbuf[256];
|
|
struct sockaddr *remote = (struct sockaddr*)addrbuf;
|
|
/* length of the remote address. Must be whatever accept() needs. */
|
|
socklen_t remotelen = (socklen_t)sizeof(addrbuf);
|
|
or_options_t *options = get_options();
|
|
|
|
tor_assert((size_t)remotelen >= sizeof(struct sockaddr_in));
|
|
memset(addrbuf, 0, sizeof(addrbuf));
|
|
|
|
news = tor_accept_socket(conn->s,remote,&remotelen);
|
|
if (news < 0) { /* accept() error */
|
|
int e = tor_socket_errno(conn->s);
|
|
if (ERRNO_IS_ACCEPT_EAGAIN(e)) {
|
|
return 0; /* he hung up before we could accept(). that's fine. */
|
|
} else if (ERRNO_IS_ACCEPT_RESOURCE_LIMIT(e)) {
|
|
warn_too_many_conns();
|
|
return 0;
|
|
}
|
|
/* else there was a real error. */
|
|
log_warn(LD_NET,"accept() failed: %s. Closing listener.",
|
|
tor_socket_strerror(e));
|
|
connection_mark_for_close(conn);
|
|
return -1;
|
|
}
|
|
log_debug(LD_NET,
|
|
"Connection accepted on socket %d (child of fd %d).",
|
|
news,conn->s);
|
|
|
|
set_socket_nonblocking(news);
|
|
|
|
if (options->ConstrainedSockets)
|
|
set_constrained_socket_buffers(news, (int)options->ConstrainedSockSize);
|
|
|
|
if (check_sockaddr_family_match(remote->sa_family, conn) < 0) {
|
|
tor_close_socket(news);
|
|
return 0;
|
|
}
|
|
|
|
if (conn->socket_family == AF_INET || conn->socket_family == AF_INET6) {
|
|
tor_addr_t addr;
|
|
uint16_t port;
|
|
if (check_sockaddr(remote, remotelen, LOG_INFO)<0) {
|
|
log_info(LD_NET,
|
|
"accept() returned a strange address; trying getsockname().");
|
|
remotelen=sizeof(addrbuf);
|
|
memset(addrbuf, 0, sizeof(addrbuf));
|
|
if (getsockname(news, remote, &remotelen)<0) {
|
|
int e = tor_socket_errno(news);
|
|
log_warn(LD_NET, "getsockname() for new connection failed: %s",
|
|
tor_socket_strerror(e));
|
|
} else {
|
|
if (check_sockaddr((struct sockaddr*)addrbuf, remotelen,
|
|
LOG_WARN) < 0) {
|
|
log_warn(LD_NET,"Something's wrong with this conn. Closing it.");
|
|
tor_close_socket(news);
|
|
return 0;
|
|
}
|
|
}
|
|
}
|
|
|
|
if (check_sockaddr_family_match(remote->sa_family, conn) < 0) {
|
|
tor_close_socket(news);
|
|
return 0;
|
|
}
|
|
|
|
tor_addr_from_sockaddr(&addr, remote, &port);
|
|
|
|
/* process entrance policies here, before we even create the connection */
|
|
if (new_type == CONN_TYPE_AP) {
|
|
/* check sockspolicy to see if we should accept it */
|
|
if (socks_policy_permits_address(&addr) == 0) {
|
|
log_notice(LD_APP,
|
|
"Denying socks connection from untrusted address %s.",
|
|
fmt_addr(&addr));
|
|
tor_close_socket(news);
|
|
return 0;
|
|
}
|
|
}
|
|
if (new_type == CONN_TYPE_DIR) {
|
|
/* check dirpolicy to see if we should accept it */
|
|
if (dir_policy_permits_address(&addr) == 0) {
|
|
log_notice(LD_DIRSERV,"Denying dir connection from address %s.",
|
|
fmt_addr(&addr));
|
|
tor_close_socket(news);
|
|
return 0;
|
|
}
|
|
}
|
|
|
|
newconn = connection_new(new_type, conn->socket_family);
|
|
newconn->s = news;
|
|
|
|
/* remember the remote address */
|
|
tor_addr_copy(&newconn->addr, &addr);
|
|
newconn->port = port;
|
|
newconn->address = tor_dup_addr(&addr);
|
|
|
|
} else if (conn->socket_family == AF_UNIX) {
|
|
/* For now only control ports can be Unix domain sockets
|
|
* and listeners at the same time */
|
|
tor_assert(conn->type == CONN_TYPE_CONTROL_LISTENER);
|
|
|
|
newconn = connection_new(new_type, conn->socket_family);
|
|
newconn->s = news;
|
|
|
|
/* remember the remote address -- do we have anything sane to put here? */
|
|
tor_addr_make_unspec(&newconn->addr);
|
|
newconn->port = 1;
|
|
newconn->address = tor_strdup(conn->address);
|
|
} else {
|
|
tor_assert(0);
|
|
};
|
|
|
|
if (connection_add(newconn) < 0) { /* no space, forget it */
|
|
connection_free(newconn);
|
|
return 0; /* no need to tear down the parent */
|
|
}
|
|
|
|
if (connection_init_accepted_conn(newconn, conn->type) < 0) {
|
|
connection_mark_for_close(newconn);
|
|
return 0;
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
/** Initialize states for newly accepted connection <b>conn</b>.
|
|
* If conn is an OR, start the TLS handshake.
|
|
* If conn is a transparent AP, get its original destination
|
|
* and place it in circuit_wait.
|
|
*/
|
|
static int
|
|
connection_init_accepted_conn(connection_t *conn, uint8_t listener_type)
|
|
{
|
|
connection_start_reading(conn);
|
|
|
|
switch (conn->type) {
|
|
case CONN_TYPE_OR:
|
|
control_event_or_conn_status(TO_OR_CONN(conn), OR_CONN_EVENT_NEW, 0);
|
|
return connection_tls_start_handshake(TO_OR_CONN(conn), 1);
|
|
case CONN_TYPE_AP:
|
|
switch (listener_type) {
|
|
case CONN_TYPE_AP_LISTENER:
|
|
conn->state = AP_CONN_STATE_SOCKS_WAIT;
|
|
break;
|
|
case CONN_TYPE_AP_TRANS_LISTENER:
|
|
conn->state = AP_CONN_STATE_CIRCUIT_WAIT;
|
|
return connection_ap_process_transparent(TO_EDGE_CONN(conn));
|
|
case CONN_TYPE_AP_NATD_LISTENER:
|
|
conn->state = AP_CONN_STATE_NATD_WAIT;
|
|
break;
|
|
}
|
|
break;
|
|
case CONN_TYPE_DIR:
|
|
conn->purpose = DIR_PURPOSE_SERVER;
|
|
conn->state = DIR_CONN_STATE_SERVER_COMMAND_WAIT;
|
|
break;
|
|
case CONN_TYPE_CONTROL:
|
|
conn->state = CONTROL_CONN_STATE_NEEDAUTH;
|
|
break;
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
/** Take conn, make a nonblocking socket; try to connect to
|
|
* addr:port (they arrive in *host order*). If fail, return -1 and if
|
|
* applicable put your best guess about errno into *<b>socket_error</b>.
|
|
* Else assign s to conn-\>s: if connected return 1, if EAGAIN return 0.
|
|
*
|
|
* address is used to make the logs useful.
|
|
*
|
|
* On success, add conn to the list of polled connections.
|
|
*/
|
|
int
|
|
connection_connect(connection_t *conn, const char *address,
|
|
const tor_addr_t *addr, uint16_t port, int *socket_error)
|
|
{
|
|
int s, inprogress = 0;
|
|
char addrbuf[256];
|
|
struct sockaddr *dest_addr = (struct sockaddr*) addrbuf;
|
|
socklen_t dest_addr_len;
|
|
or_options_t *options = get_options();
|
|
int protocol_family;
|
|
|
|
if (get_n_open_sockets() >= get_options()->_ConnLimit-1) {
|
|
warn_too_many_conns();
|
|
return -1;
|
|
}
|
|
|
|
if (tor_addr_family(addr) == AF_INET6)
|
|
protocol_family = PF_INET6;
|
|
else
|
|
protocol_family = PF_INET;
|
|
|
|
s = tor_open_socket(protocol_family,SOCK_STREAM,IPPROTO_TCP);
|
|
if (s < 0) {
|
|
*socket_error = tor_socket_errno(-1);
|
|
log_warn(LD_NET,"Error creating network socket: %s",
|
|
tor_socket_strerror(*socket_error));
|
|
return -1;
|
|
}
|
|
|
|
if (options->OutboundBindAddress && !tor_addr_is_loopback(addr)) {
|
|
struct sockaddr_in ext_addr;
|
|
|
|
memset(&ext_addr, 0, sizeof(ext_addr));
|
|
ext_addr.sin_family = AF_INET;
|
|
ext_addr.sin_port = 0;
|
|
if (!tor_inet_aton(options->OutboundBindAddress, &ext_addr.sin_addr)) {
|
|
log_warn(LD_CONFIG,"Outbound bind address '%s' didn't parse. Ignoring.",
|
|
options->OutboundBindAddress);
|
|
} else {
|
|
if (bind(s, (struct sockaddr*)&ext_addr,
|
|
(socklen_t)sizeof(ext_addr)) < 0) {
|
|
*socket_error = tor_socket_errno(s);
|
|
log_warn(LD_NET,"Error binding network socket: %s",
|
|
tor_socket_strerror(*socket_error));
|
|
tor_close_socket(s);
|
|
return -1;
|
|
}
|
|
}
|
|
}
|
|
|
|
set_socket_nonblocking(s);
|
|
|
|
if (options->ConstrainedSockets)
|
|
set_constrained_socket_buffers(s, (int)options->ConstrainedSockSize);
|
|
|
|
memset(addrbuf,0,sizeof(addrbuf));
|
|
dest_addr = (struct sockaddr*) addrbuf;
|
|
dest_addr_len = tor_addr_to_sockaddr(addr, port, dest_addr, sizeof(addrbuf));
|
|
tor_assert(dest_addr_len > 0);
|
|
|
|
log_debug(LD_NET, "Connecting to %s:%u.",
|
|
escaped_safe_str_client(address), port);
|
|
|
|
if (connect(s, dest_addr, dest_addr_len) < 0) {
|
|
int e = tor_socket_errno(s);
|
|
if (!ERRNO_IS_CONN_EINPROGRESS(e)) {
|
|
/* yuck. kill it. */
|
|
*socket_error = e;
|
|
log_info(LD_NET,
|
|
"connect() to %s:%u failed: %s",
|
|
escaped_safe_str_client(address),
|
|
port, tor_socket_strerror(e));
|
|
tor_close_socket(s);
|
|
return -1;
|
|
} else {
|
|
inprogress = 1;
|
|
}
|
|
}
|
|
|
|
if (!server_mode(options))
|
|
client_check_address_changed(s);
|
|
|
|
/* it succeeded. we're connected. */
|
|
log_fn(inprogress?LOG_DEBUG:LOG_INFO, LD_NET,
|
|
"Connection to %s:%u %s (sock %d).",
|
|
escaped_safe_str_client(address),
|
|
port, inprogress?"in progress":"established", s);
|
|
conn->s = s;
|
|
if (connection_add(conn) < 0) /* no space, forget it */
|
|
return -1;
|
|
return inprogress ? 0 : 1;
|
|
}
|
|
|
|
/** Convert state number to string representation for logging purposes.
|
|
*/
|
|
static const char *
|
|
connection_proxy_state_to_string(int state)
|
|
{
|
|
static const char *unknown = "???";
|
|
static const char *states[] = {
|
|
"PROXY_NONE",
|
|
"PROXY_HTTPS_WANT_CONNECT_OK",
|
|
"PROXY_SOCKS4_WANT_CONNECT_OK",
|
|
"PROXY_SOCKS5_WANT_AUTH_METHOD_NONE",
|
|
"PROXY_SOCKS5_WANT_AUTH_METHOD_RFC1929",
|
|
"PROXY_SOCKS5_WANT_AUTH_RFC1929_OK",
|
|
"PROXY_SOCKS5_WANT_CONNECT_OK",
|
|
"PROXY_CONNECTED",
|
|
};
|
|
|
|
if (state < PROXY_NONE || state > PROXY_CONNECTED)
|
|
return unknown;
|
|
|
|
return states[state];
|
|
}
|
|
|
|
/** Write a proxy request of <b>type</b> (socks4, socks5, https) to conn
|
|
* for conn->addr:conn->port, authenticating with the auth details given
|
|
* in the configuration (if available). SOCKS 5 and HTTP CONNECT proxies
|
|
* support authentication.
|
|
*
|
|
* Returns -1 if conn->addr is incompatible with the proxy protocol, and
|
|
* 0 otherwise.
|
|
*
|
|
* Use connection_read_proxy_handshake() to complete the handshake.
|
|
*/
|
|
int
|
|
connection_proxy_connect(connection_t *conn, int type)
|
|
{
|
|
or_options_t *options;
|
|
|
|
tor_assert(conn);
|
|
|
|
options = get_options();
|
|
|
|
switch (type) {
|
|
case PROXY_CONNECT: {
|
|
char buf[1024];
|
|
char *base64_authenticator=NULL;
|
|
const char *authenticator = options->HttpsProxyAuthenticator;
|
|
|
|
/* Send HTTP CONNECT and authentication (if available) in
|
|
* one request */
|
|
|
|
if (authenticator) {
|
|
base64_authenticator = alloc_http_authenticator(authenticator);
|
|
if (!base64_authenticator)
|
|
log_warn(LD_OR, "Encoding https authenticator failed");
|
|
}
|
|
|
|
if (base64_authenticator) {
|
|
tor_snprintf(buf, sizeof(buf), "CONNECT %s:%d HTTP/1.1\r\n"
|
|
"Proxy-Authorization: Basic %s\r\n\r\n",
|
|
fmt_addr(&conn->addr),
|
|
conn->port, base64_authenticator);
|
|
tor_free(base64_authenticator);
|
|
} else {
|
|
tor_snprintf(buf, sizeof(buf), "CONNECT %s:%d HTTP/1.0\r\n\r\n",
|
|
fmt_addr(&conn->addr), conn->port);
|
|
}
|
|
|
|
connection_write_to_buf(buf, strlen(buf), conn);
|
|
conn->proxy_state = PROXY_HTTPS_WANT_CONNECT_OK;
|
|
break;
|
|
}
|
|
|
|
case PROXY_SOCKS4: {
|
|
unsigned char buf[9];
|
|
uint16_t portn;
|
|
uint32_t ip4addr;
|
|
|
|
/* Send a SOCKS4 connect request with empty user id */
|
|
|
|
if (tor_addr_family(&conn->addr) != AF_INET) {
|
|
log_warn(LD_NET, "SOCKS4 client is incompatible with IPv6");
|
|
return -1;
|
|
}
|
|
|
|
ip4addr = tor_addr_to_ipv4n(&conn->addr);
|
|
portn = htons(conn->port);
|
|
|
|
buf[0] = 4; /* version */
|
|
buf[1] = SOCKS_COMMAND_CONNECT; /* command */
|
|
memcpy(buf + 2, &portn, 2); /* port */
|
|
memcpy(buf + 4, &ip4addr, 4); /* addr */
|
|
buf[8] = 0; /* userid (empty) */
|
|
|
|
connection_write_to_buf((char *)buf, sizeof(buf), conn);
|
|
conn->proxy_state = PROXY_SOCKS4_WANT_CONNECT_OK;
|
|
break;
|
|
}
|
|
|
|
case PROXY_SOCKS5: {
|
|
unsigned char buf[4]; /* fields: vers, num methods, method list */
|
|
|
|
/* Send a SOCKS5 greeting (connect request must wait) */
|
|
|
|
buf[0] = 5; /* version */
|
|
|
|
/* number of auth methods */
|
|
if (options->Socks5ProxyUsername) {
|
|
buf[1] = 2;
|
|
buf[2] = 0x00; /* no authentication */
|
|
buf[3] = 0x02; /* rfc1929 Username/Passwd auth */
|
|
conn->proxy_state = PROXY_SOCKS5_WANT_AUTH_METHOD_RFC1929;
|
|
} else {
|
|
buf[1] = 1;
|
|
buf[2] = 0x00; /* no authentication */
|
|
conn->proxy_state = PROXY_SOCKS5_WANT_AUTH_METHOD_NONE;
|
|
}
|
|
|
|
connection_write_to_buf((char *)buf, 2 + buf[1], conn);
|
|
break;
|
|
}
|
|
|
|
default:
|
|
log_err(LD_BUG, "Invalid proxy protocol, %d", type);
|
|
tor_fragile_assert();
|
|
return -1;
|
|
}
|
|
|
|
log_debug(LD_NET, "set state %s",
|
|
connection_proxy_state_to_string(conn->proxy_state));
|
|
|
|
return 0;
|
|
}
|
|
|
|
/** Read conn's inbuf. If the http response from the proxy is all
|
|
* here, make sure it's good news, then return 1. If it's bad news,
|
|
* return -1. Else return 0 and hope for better luck next time.
|
|
*/
|
|
static int
|
|
connection_read_https_proxy_response(connection_t *conn)
|
|
{
|
|
char *headers;
|
|
char *reason=NULL;
|
|
int status_code;
|
|
time_t date_header;
|
|
|
|
switch (fetch_from_buf_http(conn->inbuf,
|
|
&headers, MAX_HEADERS_SIZE,
|
|
NULL, NULL, 10000, 0)) {
|
|
case -1: /* overflow */
|
|
log_warn(LD_PROTOCOL,
|
|
"Your https proxy sent back an oversized response. Closing.");
|
|
return -1;
|
|
case 0:
|
|
log_info(LD_NET,"https proxy response not all here yet. Waiting.");
|
|
return 0;
|
|
/* case 1, fall through */
|
|
}
|
|
|
|
if (parse_http_response(headers, &status_code, &date_header,
|
|
NULL, &reason) < 0) {
|
|
log_warn(LD_NET,
|
|
"Unparseable headers from proxy (connecting to '%s'). Closing.",
|
|
conn->address);
|
|
tor_free(headers);
|
|
return -1;
|
|
}
|
|
if (!reason) reason = tor_strdup("[no reason given]");
|
|
|
|
if (status_code == 200) {
|
|
log_info(LD_NET,
|
|
"HTTPS connect to '%s' successful! (200 %s) Starting TLS.",
|
|
conn->address, escaped(reason));
|
|
tor_free(reason);
|
|
return 1;
|
|
}
|
|
/* else, bad news on the status code */
|
|
log_warn(LD_NET,
|
|
"The https proxy sent back an unexpected status code %d (%s). "
|
|
"Closing.",
|
|
status_code, escaped(reason));
|
|
tor_free(reason);
|
|
return -1;
|
|
}
|
|
|
|
/** Send SOCKS5 CONNECT command to <b>conn</b>, copying <b>conn->addr</b>
|
|
* and <b>conn->port</b> into the request.
|
|
*/
|
|
static void
|
|
connection_send_socks5_connect(connection_t *conn)
|
|
{
|
|
unsigned char buf[1024];
|
|
size_t reqsize = 6;
|
|
uint16_t port = htons(conn->port);
|
|
|
|
buf[0] = 5; /* version */
|
|
buf[1] = SOCKS_COMMAND_CONNECT; /* command */
|
|
buf[2] = 0; /* reserved */
|
|
|
|
if (tor_addr_family(&conn->addr) == AF_INET) {
|
|
uint32_t addr = tor_addr_to_ipv4n(&conn->addr);
|
|
|
|
buf[3] = 1;
|
|
reqsize += 4;
|
|
memcpy(buf + 4, &addr, 4);
|
|
memcpy(buf + 8, &port, 2);
|
|
} else { /* AF_INET6 */
|
|
buf[3] = 4;
|
|
reqsize += 16;
|
|
memcpy(buf + 4, tor_addr_to_in6(&conn->addr), 16);
|
|
memcpy(buf + 20, &port, 2);
|
|
}
|
|
|
|
connection_write_to_buf((char *)buf, reqsize, conn);
|
|
|
|
conn->proxy_state = PROXY_SOCKS5_WANT_CONNECT_OK;
|
|
}
|
|
|
|
/** Call this from connection_*_process_inbuf() to advance the proxy
|
|
* handshake.
|
|
*
|
|
* No matter what proxy protocol is used, if this function returns 1, the
|
|
* handshake is complete, and the data remaining on inbuf may contain the
|
|
* start of the communication with the requested server.
|
|
*
|
|
* Returns 0 if the current buffer contains an incomplete response, and -1
|
|
* on error.
|
|
*/
|
|
int
|
|
connection_read_proxy_handshake(connection_t *conn)
|
|
{
|
|
int ret = 0;
|
|
char *reason = NULL;
|
|
|
|
log_debug(LD_NET, "enter state %s",
|
|
connection_proxy_state_to_string(conn->proxy_state));
|
|
|
|
switch (conn->proxy_state) {
|
|
case PROXY_HTTPS_WANT_CONNECT_OK:
|
|
ret = connection_read_https_proxy_response(conn);
|
|
if (ret == 1)
|
|
conn->proxy_state = PROXY_CONNECTED;
|
|
break;
|
|
|
|
case PROXY_SOCKS4_WANT_CONNECT_OK:
|
|
ret = fetch_from_buf_socks_client(conn->inbuf,
|
|
conn->proxy_state,
|
|
&reason);
|
|
if (ret == 1)
|
|
conn->proxy_state = PROXY_CONNECTED;
|
|
break;
|
|
|
|
case PROXY_SOCKS5_WANT_AUTH_METHOD_NONE:
|
|
ret = fetch_from_buf_socks_client(conn->inbuf,
|
|
conn->proxy_state,
|
|
&reason);
|
|
/* no auth needed, do connect */
|
|
if (ret == 1) {
|
|
connection_send_socks5_connect(conn);
|
|
ret = 0;
|
|
}
|
|
break;
|
|
|
|
case PROXY_SOCKS5_WANT_AUTH_METHOD_RFC1929:
|
|
ret = fetch_from_buf_socks_client(conn->inbuf,
|
|
conn->proxy_state,
|
|
&reason);
|
|
|
|
/* send auth if needed, otherwise do connect */
|
|
if (ret == 1) {
|
|
connection_send_socks5_connect(conn);
|
|
ret = 0;
|
|
} else if (ret == 2) {
|
|
unsigned char buf[1024];
|
|
size_t reqsize, usize, psize;
|
|
const char *user, *pass;
|
|
|
|
user = get_options()->Socks5ProxyUsername;
|
|
pass = get_options()->Socks5ProxyPassword;
|
|
tor_assert(user && pass);
|
|
|
|
/* XXX len of user and pass must be <= 255 !!! */
|
|
usize = strlen(user);
|
|
psize = strlen(pass);
|
|
tor_assert(usize <= 255 && psize <= 255);
|
|
reqsize = 3 + usize + psize;
|
|
|
|
buf[0] = 1; /* negotiation version */
|
|
buf[1] = usize;
|
|
memcpy(buf + 2, user, usize);
|
|
buf[2 + usize] = psize;
|
|
memcpy(buf + 3 + usize, pass, psize);
|
|
|
|
connection_write_to_buf((char *)buf, reqsize, conn);
|
|
|
|
conn->proxy_state = PROXY_SOCKS5_WANT_AUTH_RFC1929_OK;
|
|
ret = 0;
|
|
}
|
|
break;
|
|
|
|
case PROXY_SOCKS5_WANT_AUTH_RFC1929_OK:
|
|
ret = fetch_from_buf_socks_client(conn->inbuf,
|
|
conn->proxy_state,
|
|
&reason);
|
|
/* send the connect request */
|
|
if (ret == 1) {
|
|
connection_send_socks5_connect(conn);
|
|
ret = 0;
|
|
}
|
|
break;
|
|
|
|
case PROXY_SOCKS5_WANT_CONNECT_OK:
|
|
ret = fetch_from_buf_socks_client(conn->inbuf,
|
|
conn->proxy_state,
|
|
&reason);
|
|
if (ret == 1)
|
|
conn->proxy_state = PROXY_CONNECTED;
|
|
break;
|
|
|
|
default:
|
|
log_err(LD_BUG, "Invalid proxy_state for reading, %d",
|
|
conn->proxy_state);
|
|
tor_fragile_assert();
|
|
ret = -1;
|
|
break;
|
|
}
|
|
|
|
log_debug(LD_NET, "leaving state %s",
|
|
connection_proxy_state_to_string(conn->proxy_state));
|
|
|
|
if (ret < 0) {
|
|
if (reason) {
|
|
log_warn(LD_NET, "Proxy Client: unable to connect to %s:%d (%s)",
|
|
conn->address, conn->port, escaped(reason));
|
|
tor_free(reason);
|
|
} else {
|
|
log_warn(LD_NET, "Proxy Client: unable to connect to %s:%d",
|
|
conn->address, conn->port);
|
|
}
|
|
} else if (ret == 1) {
|
|
log_info(LD_NET, "Proxy Client: connection to %s:%d successful",
|
|
conn->address, conn->port);
|
|
}
|
|
|
|
return ret;
|
|
}
|
|
|
|
/**
|
|
* Launch any configured listener connections of type <b>type</b>. (A
|
|
* listener is configured if <b>port_option</b> is non-zero. If any
|
|
* ListenAddress configuration options are given in <b>cfg</b>, create a
|
|
* connection binding to each one. Otherwise, create a single
|
|
* connection binding to the address <b>default_addr</b>.)
|
|
*
|
|
* Only launch the listeners of this type that are not already open, and
|
|
* only close listeners that are no longer wanted. Existing listeners
|
|
* that are still configured are not touched.
|
|
*
|
|
* If <b>disable_all_conns</b> is set, then never open new conns, and
|
|
* close the existing ones.
|
|
*
|
|
* Add all old conns that should be closed to <b>replaced_conns</b>.
|
|
* Add all new connections to <b>new_conns</b>.
|
|
*/
|
|
static int
|
|
retry_listeners(int type, config_line_t *cfg,
|
|
int port_option, const char *default_addr,
|
|
smartlist_t *replaced_conns,
|
|
smartlist_t *new_conns,
|
|
int disable_all_conns,
|
|
int socket_family)
|
|
{
|
|
smartlist_t *launch = smartlist_create(), *conns;
|
|
int free_launch_elts = 1;
|
|
int r;
|
|
config_line_t *c;
|
|
connection_t *conn;
|
|
config_line_t *line;
|
|
|
|
tor_assert(socket_family == AF_INET || socket_family == AF_UNIX);
|
|
|
|
if (cfg && port_option) {
|
|
for (c = cfg; c; c = c->next) {
|
|
smartlist_add(launch, c);
|
|
}
|
|
free_launch_elts = 0;
|
|
} else if (port_option) {
|
|
line = tor_malloc_zero(sizeof(config_line_t));
|
|
line->key = tor_strdup("");
|
|
line->value = tor_strdup(default_addr);
|
|
smartlist_add(launch, line);
|
|
}
|
|
|
|
/*
|
|
SMARTLIST_FOREACH(launch, config_line_t *, l,
|
|
log_fn(LOG_NOTICE, "#%s#%s", l->key, l->value));
|
|
*/
|
|
|
|
conns = get_connection_array();
|
|
SMARTLIST_FOREACH(conns, connection_t *, conn,
|
|
{
|
|
if (conn->type != type ||
|
|
conn->socket_family != socket_family ||
|
|
conn->marked_for_close)
|
|
continue;
|
|
/* Okay, so this is a listener. Is it configured? */
|
|
line = NULL;
|
|
SMARTLIST_FOREACH(launch, config_line_t *, wanted,
|
|
{
|
|
char *address=NULL;
|
|
uint16_t port;
|
|
switch (socket_family) {
|
|
case AF_INET:
|
|
if (!parse_addr_port(LOG_WARN,
|
|
wanted->value, &address, NULL, &port)) {
|
|
int addr_matches = !strcasecmp(address, conn->address);
|
|
tor_free(address);
|
|
if (! port)
|
|
port = port_option;
|
|
if (port == conn->port && addr_matches) {
|
|
line = wanted;
|
|
break;
|
|
}
|
|
}
|
|
break;
|
|
case AF_UNIX:
|
|
if (!strcasecmp(wanted->value, conn->address)) {
|
|
line = wanted;
|
|
break;
|
|
}
|
|
break;
|
|
default:
|
|
tor_assert(0);
|
|
}
|
|
});
|
|
if (!line || disable_all_conns) {
|
|
/* This one isn't configured. Close it. */
|
|
log_notice(LD_NET, "Closing no-longer-configured %s on %s:%d",
|
|
conn_type_to_string(type), conn->address, conn->port);
|
|
if (replaced_conns) {
|
|
smartlist_add(replaced_conns, conn);
|
|
} else {
|
|
connection_close_immediate(conn);
|
|
connection_mark_for_close(conn);
|
|
}
|
|
} else {
|
|
/* It's configured; we don't need to launch it. */
|
|
// log_debug(LD_NET, "Already have %s on %s:%d",
|
|
// conn_type_to_string(type), conn->address, conn->port);
|
|
smartlist_remove(launch, line);
|
|
if (free_launch_elts)
|
|
config_free_lines(line);
|
|
}
|
|
});
|
|
|
|
/* Now open all the listeners that are configured but not opened. */
|
|
r = 0;
|
|
if (!disable_all_conns) {
|
|
SMARTLIST_FOREACH_BEGIN(launch, config_line_t *, cfg_line) {
|
|
char *address = NULL;
|
|
struct sockaddr *listensockaddr;
|
|
socklen_t listensocklen = 0;
|
|
|
|
switch (socket_family) {
|
|
case AF_INET:
|
|
listensockaddr = (struct sockaddr *)
|
|
create_inet_sockaddr(cfg_line->value,
|
|
(uint16_t) port_option,
|
|
&address, &listensocklen);
|
|
break;
|
|
case AF_UNIX:
|
|
listensockaddr = (struct sockaddr *)
|
|
create_unix_sockaddr(cfg_line->value,
|
|
&address, &listensocklen);
|
|
break;
|
|
default:
|
|
tor_assert(0);
|
|
}
|
|
|
|
if (listensockaddr) {
|
|
conn = connection_create_listener(listensockaddr, listensocklen,
|
|
type, address);
|
|
tor_free(listensockaddr);
|
|
tor_free(address);
|
|
} else
|
|
conn = NULL;
|
|
|
|
if (!conn) {
|
|
r = -1;
|
|
} else {
|
|
if (new_conns)
|
|
smartlist_add(new_conns, conn);
|
|
}
|
|
} SMARTLIST_FOREACH_END(cfg_line);
|
|
}
|
|
|
|
if (free_launch_elts) {
|
|
SMARTLIST_FOREACH(launch, config_line_t *, cfg_line,
|
|
config_free_lines(cfg_line));
|
|
}
|
|
smartlist_free(launch);
|
|
|
|
return r;
|
|
}
|
|
|
|
/** Launch listeners for each port you should have open. Only launch
|
|
* listeners who are not already open, and only close listeners we no longer
|
|
* want.
|
|
*
|
|
* Add all old conns that should be closed to <b>replaced_conns</b>.
|
|
* Add all new connections to <b>new_conns</b>.
|
|
*/
|
|
int
|
|
retry_all_listeners(smartlist_t *replaced_conns,
|
|
smartlist_t *new_conns)
|
|
{
|
|
or_options_t *options = get_options();
|
|
|
|
if (retry_listeners(CONN_TYPE_OR_LISTENER, options->ORListenAddress,
|
|
options->ORPort, "0.0.0.0",
|
|
replaced_conns, new_conns, options->ClientOnly,
|
|
AF_INET)<0)
|
|
return -1;
|
|
if (retry_listeners(CONN_TYPE_DIR_LISTENER, options->DirListenAddress,
|
|
options->DirPort, "0.0.0.0",
|
|
replaced_conns, new_conns, options->ClientOnly,
|
|
AF_INET)<0)
|
|
return -1;
|
|
if (retry_listeners(CONN_TYPE_AP_LISTENER, options->SocksListenAddress,
|
|
options->SocksPort, "127.0.0.1",
|
|
replaced_conns, new_conns, 0,
|
|
AF_INET)<0)
|
|
return -1;
|
|
if (retry_listeners(CONN_TYPE_AP_TRANS_LISTENER, options->TransListenAddress,
|
|
options->TransPort, "127.0.0.1",
|
|
replaced_conns, new_conns, 0,
|
|
AF_INET)<0)
|
|
return -1;
|
|
if (retry_listeners(CONN_TYPE_AP_NATD_LISTENER, options->NatdListenAddress,
|
|
options->NatdPort, "127.0.0.1",
|
|
replaced_conns, new_conns, 0,
|
|
AF_INET)<0)
|
|
return -1;
|
|
if (retry_listeners(CONN_TYPE_AP_DNS_LISTENER, options->DNSListenAddress,
|
|
options->DNSPort, "127.0.0.1",
|
|
replaced_conns, new_conns, 0,
|
|
AF_INET)<0)
|
|
return -1;
|
|
if (retry_listeners(CONN_TYPE_CONTROL_LISTENER,
|
|
options->ControlListenAddress,
|
|
options->ControlPort, "127.0.0.1",
|
|
replaced_conns, new_conns, 0,
|
|
AF_INET)<0)
|
|
return -1;
|
|
if (retry_listeners(CONN_TYPE_CONTROL_LISTENER,
|
|
options->ControlSocket,
|
|
options->ControlSocket ? 1 : 0, NULL,
|
|
replaced_conns, new_conns, 0,
|
|
AF_UNIX)<0)
|
|
return -1;
|
|
|
|
return 0;
|
|
}
|
|
|
|
/** Return 1 if we should apply rate limiting to <b>conn</b>,
|
|
* and 0 otherwise. Right now this just checks if it's an internal
|
|
* IP address or an internal connection. */
|
|
static int
|
|
connection_is_rate_limited(connection_t *conn)
|
|
{
|
|
if (conn->linked || /* internal connection */
|
|
tor_addr_family(&conn->addr) == AF_UNSPEC || /* no address */
|
|
tor_addr_is_internal(&conn->addr, 0)) /* internal address */
|
|
return 0;
|
|
else
|
|
return 1;
|
|
}
|
|
|
|
extern int global_read_bucket, global_write_bucket;
|
|
extern int global_relayed_read_bucket, global_relayed_write_bucket;
|
|
|
|
/** Did either global write bucket run dry last second? If so,
|
|
* we are likely to run dry again this second, so be stingy with the
|
|
* tokens we just put in. */
|
|
static int write_buckets_empty_last_second = 0;
|
|
|
|
/** How many seconds of no active local circuits will make the
|
|
* connection revert to the "relayed" bandwidth class? */
|
|
#define CLIENT_IDLE_TIME_FOR_PRIORITY 30
|
|
|
|
/** Return 1 if <b>conn</b> should use tokens from the "relayed"
|
|
* bandwidth rates, else 0. Currently, only OR conns with bandwidth
|
|
* class 1, and directory conns that are serving data out, count.
|
|
*/
|
|
static int
|
|
connection_counts_as_relayed_traffic(connection_t *conn, time_t now)
|
|
{
|
|
if (conn->type == CONN_TYPE_OR &&
|
|
TO_OR_CONN(conn)->client_used + CLIENT_IDLE_TIME_FOR_PRIORITY < now)
|
|
return 1;
|
|
if (conn->type == CONN_TYPE_DIR && DIR_CONN_IS_SERVER(conn))
|
|
return 1;
|
|
return 0;
|
|
}
|
|
|
|
/** Helper function to decide how many bytes out of <b>global_bucket</b>
|
|
* we're willing to use for this transaction. <b>base</b> is the size
|
|
* of a cell on the network; <b>priority</b> says whether we should
|
|
* write many of them or just a few; and <b>conn_bucket</b> (if
|
|
* non-negative) provides an upper limit for our answer. */
|
|
static ssize_t
|
|
connection_bucket_round_robin(int base, int priority,
|
|
ssize_t global_bucket, ssize_t conn_bucket)
|
|
{
|
|
ssize_t at_most;
|
|
ssize_t num_bytes_high = (priority ? 32 : 16) * base;
|
|
ssize_t num_bytes_low = (priority ? 4 : 2) * base;
|
|
|
|
/* Do a rudimentary round-robin so one circuit can't hog a connection.
|
|
* Pick at most 32 cells, at least 4 cells if possible, and if we're in
|
|
* the middle pick 1/8 of the available bandwidth. */
|
|
at_most = global_bucket / 8;
|
|
at_most -= (at_most % base); /* round down */
|
|
if (at_most > num_bytes_high) /* 16 KB, or 8 KB for low-priority */
|
|
at_most = num_bytes_high;
|
|
else if (at_most < num_bytes_low) /* 2 KB, or 1 KB for low-priority */
|
|
at_most = num_bytes_low;
|
|
|
|
if (at_most > global_bucket)
|
|
at_most = global_bucket;
|
|
|
|
if (conn_bucket >= 0 && at_most > conn_bucket)
|
|
at_most = conn_bucket;
|
|
|
|
if (at_most < 0)
|
|
return 0;
|
|
return at_most;
|
|
}
|
|
|
|
/** How many bytes at most can we read onto this connection? */
|
|
static ssize_t
|
|
connection_bucket_read_limit(connection_t *conn, time_t now)
|
|
{
|
|
int base = connection_speaks_cells(conn) ?
|
|
CELL_NETWORK_SIZE : RELAY_PAYLOAD_SIZE;
|
|
int priority = conn->type != CONN_TYPE_DIR;
|
|
int conn_bucket = -1;
|
|
int global_bucket = global_read_bucket;
|
|
|
|
if (connection_speaks_cells(conn)) {
|
|
or_connection_t *or_conn = TO_OR_CONN(conn);
|
|
if (conn->state == OR_CONN_STATE_OPEN)
|
|
conn_bucket = or_conn->read_bucket;
|
|
}
|
|
|
|
if (!connection_is_rate_limited(conn)) {
|
|
/* be willing to read on local conns even if our buckets are empty */
|
|
return conn_bucket>=0 ? conn_bucket : 1<<14;
|
|
}
|
|
|
|
if (connection_counts_as_relayed_traffic(conn, now) &&
|
|
global_relayed_read_bucket <= global_read_bucket)
|
|
global_bucket = global_relayed_read_bucket;
|
|
|
|
return connection_bucket_round_robin(base, priority,
|
|
global_bucket, conn_bucket);
|
|
}
|
|
|
|
/** How many bytes at most can we write onto this connection? */
|
|
ssize_t
|
|
connection_bucket_write_limit(connection_t *conn, time_t now)
|
|
{
|
|
int base = connection_speaks_cells(conn) ?
|
|
CELL_NETWORK_SIZE : RELAY_PAYLOAD_SIZE;
|
|
int priority = conn->type != CONN_TYPE_DIR;
|
|
int conn_bucket = (int)conn->outbuf_flushlen;
|
|
int global_bucket = global_write_bucket;
|
|
|
|
if (!connection_is_rate_limited(conn)) {
|
|
/* be willing to write to local conns even if our buckets are empty */
|
|
return conn->outbuf_flushlen;
|
|
}
|
|
|
|
if (connection_speaks_cells(conn)) {
|
|
/* use the per-conn write limit if it's lower, but if it's less
|
|
* than zero just use zero */
|
|
or_connection_t *or_conn = TO_OR_CONN(conn);
|
|
if (conn->state == OR_CONN_STATE_OPEN)
|
|
if (or_conn->write_bucket < conn_bucket)
|
|
conn_bucket = or_conn->write_bucket >= 0 ?
|
|
or_conn->write_bucket : 0;
|
|
}
|
|
|
|
if (connection_counts_as_relayed_traffic(conn, now) &&
|
|
global_relayed_write_bucket <= global_write_bucket)
|
|
global_bucket = global_relayed_write_bucket;
|
|
|
|
return connection_bucket_round_robin(base, priority,
|
|
global_bucket, conn_bucket);
|
|
}
|
|
|
|
/** Return 1 if the global write buckets are low enough that we
|
|
* shouldn't send <b>attempt</b> bytes of low-priority directory stuff
|
|
* out to <b>conn</b>. Else return 0.
|
|
|
|
* Priority is 1 for v1 requests (directories and running-routers),
|
|
* and 2 for v2 requests (statuses and descriptors). But see FFFF in
|
|
* directory_handle_command_get() for why we don't use priority 2 yet.
|
|
*
|
|
* There are a lot of parameters we could use here:
|
|
* - global_relayed_write_bucket. Low is bad.
|
|
* - global_write_bucket. Low is bad.
|
|
* - bandwidthrate. Low is bad.
|
|
* - bandwidthburst. Not a big factor?
|
|
* - attempt. High is bad.
|
|
* - total bytes queued on outbufs. High is bad. But I'm wary of
|
|
* using this, since a few slow-flushing queues will pump up the
|
|
* number without meaning what we meant to mean. What we really
|
|
* mean is "total directory bytes added to outbufs recently", but
|
|
* that's harder to quantify and harder to keep track of.
|
|
*/
|
|
int
|
|
global_write_bucket_low(connection_t *conn, size_t attempt, int priority)
|
|
{
|
|
int smaller_bucket = global_write_bucket < global_relayed_write_bucket ?
|
|
global_write_bucket : global_relayed_write_bucket;
|
|
if (authdir_mode(get_options()) && priority>1)
|
|
return 0; /* there's always room to answer v2 if we're an auth dir */
|
|
|
|
if (!connection_is_rate_limited(conn))
|
|
return 0; /* local conns don't get limited */
|
|
|
|
if (smaller_bucket < (int)attempt)
|
|
return 1; /* not enough space no matter the priority */
|
|
|
|
if (write_buckets_empty_last_second)
|
|
return 1; /* we're already hitting our limits, no more please */
|
|
|
|
if (priority == 1) { /* old-style v1 query */
|
|
/* Could we handle *two* of these requests within the next two seconds? */
|
|
or_options_t *options = get_options();
|
|
int64_t can_write = (int64_t)smaller_bucket
|
|
+ 2*(options->RelayBandwidthRate ? options->RelayBandwidthRate :
|
|
options->BandwidthRate);
|
|
if (can_write < 2*(int64_t)attempt)
|
|
return 1;
|
|
} else { /* v2 query */
|
|
/* no further constraints yet */
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
/** We just read <b>num_read</b> and wrote <b>num_written</b> bytes
|
|
* onto <b>conn</b>. Decrement buckets appropriately. */
|
|
static void
|
|
connection_buckets_decrement(connection_t *conn, time_t now,
|
|
size_t num_read, size_t num_written)
|
|
{
|
|
if (!connection_is_rate_limited(conn))
|
|
return; /* local IPs are free */
|
|
if (num_written >= INT_MAX || num_read >= INT_MAX) {
|
|
log_err(LD_BUG, "Value out of range. num_read=%lu, num_written=%lu, "
|
|
"connection type=%s, state=%s",
|
|
(unsigned long)num_read, (unsigned long)num_written,
|
|
conn_type_to_string(conn->type),
|
|
conn_state_to_string(conn->type, conn->state));
|
|
if (num_written >= INT_MAX) num_written = 1;
|
|
if (num_read >= INT_MAX) num_read = 1;
|
|
tor_fragile_assert();
|
|
}
|
|
|
|
if (num_read > 0) {
|
|
if (conn->type == CONN_TYPE_EXIT)
|
|
rep_hist_note_exit_bytes_read(conn->port, num_read);
|
|
rep_hist_note_bytes_read(num_read, now);
|
|
}
|
|
if (num_written > 0) {
|
|
if (conn->type == CONN_TYPE_EXIT)
|
|
rep_hist_note_exit_bytes_written(conn->port, num_written);
|
|
rep_hist_note_bytes_written(num_written, now);
|
|
}
|
|
|
|
if (connection_counts_as_relayed_traffic(conn, now)) {
|
|
global_relayed_read_bucket -= (int)num_read;
|
|
global_relayed_write_bucket -= (int)num_written;
|
|
}
|
|
global_read_bucket -= (int)num_read;
|
|
global_write_bucket -= (int)num_written;
|
|
if (connection_speaks_cells(conn) && conn->state == OR_CONN_STATE_OPEN) {
|
|
TO_OR_CONN(conn)->read_bucket -= (int)num_read;
|
|
TO_OR_CONN(conn)->write_bucket -= (int)num_written;
|
|
}
|
|
}
|
|
|
|
/** If we have exhausted our global buckets, or the buckets for conn,
|
|
* stop reading. */
|
|
static void
|
|
connection_consider_empty_read_buckets(connection_t *conn)
|
|
{
|
|
const char *reason;
|
|
|
|
if (global_read_bucket <= 0) {
|
|
reason = "global read bucket exhausted. Pausing.";
|
|
} else if (connection_counts_as_relayed_traffic(conn, approx_time()) &&
|
|
global_relayed_read_bucket <= 0) {
|
|
reason = "global relayed read bucket exhausted. Pausing.";
|
|
} else if (connection_speaks_cells(conn) &&
|
|
conn->state == OR_CONN_STATE_OPEN &&
|
|
TO_OR_CONN(conn)->read_bucket <= 0) {
|
|
reason = "connection read bucket exhausted. Pausing.";
|
|
} else
|
|
return; /* all good, no need to stop it */
|
|
|
|
LOG_FN_CONN(conn, (LOG_DEBUG, LD_NET, "%s", reason));
|
|
conn->read_blocked_on_bw = 1;
|
|
connection_stop_reading(conn);
|
|
}
|
|
|
|
/** If we have exhausted our global buckets, or the buckets for conn,
|
|
* stop writing. */
|
|
static void
|
|
connection_consider_empty_write_buckets(connection_t *conn)
|
|
{
|
|
const char *reason;
|
|
|
|
if (global_write_bucket <= 0) {
|
|
reason = "global write bucket exhausted. Pausing.";
|
|
} else if (connection_counts_as_relayed_traffic(conn, approx_time()) &&
|
|
global_relayed_write_bucket <= 0) {
|
|
reason = "global relayed write bucket exhausted. Pausing.";
|
|
} else if (connection_speaks_cells(conn) &&
|
|
conn->state == OR_CONN_STATE_OPEN &&
|
|
TO_OR_CONN(conn)->write_bucket <= 0) {
|
|
reason = "connection write bucket exhausted. Pausing.";
|
|
} else
|
|
return; /* all good, no need to stop it */
|
|
|
|
LOG_FN_CONN(conn, (LOG_DEBUG, LD_NET, "%s", reason));
|
|
conn->write_blocked_on_bw = 1;
|
|
connection_stop_writing(conn);
|
|
}
|
|
|
|
/** Initialize the global read bucket to options-\>BandwidthBurst. */
|
|
void
|
|
connection_bucket_init(void)
|
|
{
|
|
or_options_t *options = get_options();
|
|
/* start it at max traffic */
|
|
global_read_bucket = (int)options->BandwidthBurst;
|
|
global_write_bucket = (int)options->BandwidthBurst;
|
|
if (options->RelayBandwidthRate) {
|
|
global_relayed_read_bucket = (int)options->RelayBandwidthBurst;
|
|
global_relayed_write_bucket = (int)options->RelayBandwidthBurst;
|
|
} else {
|
|
global_relayed_read_bucket = (int)options->BandwidthBurst;
|
|
global_relayed_write_bucket = (int)options->BandwidthBurst;
|
|
}
|
|
}
|
|
|
|
/** Refill a single <b>bucket</b> called <b>name</b> with bandwidth rate
|
|
* <b>rate</b> and bandwidth burst <b>burst</b>, assuming that
|
|
* <b>seconds_elapsed</b> seconds have passed since the last call.
|
|
**/
|
|
static void
|
|
connection_bucket_refill_helper(int *bucket, int rate, int burst,
|
|
int seconds_elapsed, const char *name)
|
|
{
|
|
int starting_bucket = *bucket;
|
|
if (starting_bucket < burst && seconds_elapsed) {
|
|
if (((burst - starting_bucket)/seconds_elapsed) < rate) {
|
|
*bucket = burst; /* We would overflow the bucket; just set it to
|
|
* the maximum. */
|
|
} else {
|
|
int incr = rate*seconds_elapsed;
|
|
*bucket += incr;
|
|
if (*bucket > burst || *bucket < starting_bucket) {
|
|
/* If we overflow the burst, or underflow our starting bucket,
|
|
* cap the bucket value to burst. */
|
|
/* XXXX this might be redundant now, but it doesn't show up
|
|
* in profiles. Remove it after analysis. */
|
|
*bucket = burst;
|
|
}
|
|
}
|
|
log(LOG_DEBUG, LD_NET,"%s now %d.", name, *bucket);
|
|
}
|
|
}
|
|
|
|
/** A second has rolled over; increment buckets appropriately. */
|
|
void
|
|
connection_bucket_refill(int seconds_elapsed, time_t now)
|
|
{
|
|
or_options_t *options = get_options();
|
|
smartlist_t *conns = get_connection_array();
|
|
int relayrate, relayburst;
|
|
|
|
if (options->RelayBandwidthRate) {
|
|
relayrate = (int)options->RelayBandwidthRate;
|
|
relayburst = (int)options->RelayBandwidthBurst;
|
|
} else {
|
|
relayrate = (int)options->BandwidthRate;
|
|
relayburst = (int)options->BandwidthBurst;
|
|
}
|
|
|
|
tor_assert(seconds_elapsed >= 0);
|
|
|
|
write_buckets_empty_last_second =
|
|
global_relayed_write_bucket <= 0 || global_write_bucket <= 0;
|
|
|
|
/* refill the global buckets */
|
|
connection_bucket_refill_helper(&global_read_bucket,
|
|
(int)options->BandwidthRate,
|
|
(int)options->BandwidthBurst,
|
|
seconds_elapsed, "global_read_bucket");
|
|
connection_bucket_refill_helper(&global_write_bucket,
|
|
(int)options->BandwidthRate,
|
|
(int)options->BandwidthBurst,
|
|
seconds_elapsed, "global_write_bucket");
|
|
connection_bucket_refill_helper(&global_relayed_read_bucket,
|
|
relayrate, relayburst, seconds_elapsed,
|
|
"global_relayed_read_bucket");
|
|
connection_bucket_refill_helper(&global_relayed_write_bucket,
|
|
relayrate, relayburst, seconds_elapsed,
|
|
"global_relayed_write_bucket");
|
|
|
|
/* refill the per-connection buckets */
|
|
SMARTLIST_FOREACH(conns, connection_t *, conn,
|
|
{
|
|
if (connection_speaks_cells(conn)) {
|
|
or_connection_t *or_conn = TO_OR_CONN(conn);
|
|
if (connection_bucket_should_increase(or_conn->read_bucket, or_conn)) {
|
|
connection_bucket_refill_helper(&or_conn->read_bucket,
|
|
or_conn->bandwidthrate,
|
|
or_conn->bandwidthburst,
|
|
seconds_elapsed,
|
|
"or_conn->read_bucket");
|
|
}
|
|
if (connection_bucket_should_increase(or_conn->write_bucket, or_conn)) {
|
|
connection_bucket_refill_helper(&or_conn->write_bucket,
|
|
or_conn->bandwidthrate,
|
|
or_conn->bandwidthburst,
|
|
seconds_elapsed,
|
|
"or_conn->write_bucket");
|
|
}
|
|
}
|
|
|
|
if (conn->read_blocked_on_bw == 1 /* marked to turn reading back on now */
|
|
&& global_read_bucket > 0 /* and we're allowed to read */
|
|
&& (!connection_counts_as_relayed_traffic(conn, now) ||
|
|
global_relayed_read_bucket > 0) /* even if we're relayed traffic */
|
|
&& (!connection_speaks_cells(conn) ||
|
|
conn->state != OR_CONN_STATE_OPEN ||
|
|
TO_OR_CONN(conn)->read_bucket > 0)) {
|
|
/* and either a non-cell conn or a cell conn with non-empty bucket */
|
|
LOG_FN_CONN(conn, (LOG_DEBUG,LD_NET,
|
|
"waking up conn (fd %d) for read", conn->s));
|
|
conn->read_blocked_on_bw = 0;
|
|
connection_start_reading(conn);
|
|
}
|
|
|
|
if (conn->write_blocked_on_bw == 1
|
|
&& global_write_bucket > 0 /* and we're allowed to write */
|
|
&& (!connection_counts_as_relayed_traffic(conn, now) ||
|
|
global_relayed_write_bucket > 0) /* even if it's relayed traffic */
|
|
&& (!connection_speaks_cells(conn) ||
|
|
conn->state != OR_CONN_STATE_OPEN ||
|
|
TO_OR_CONN(conn)->write_bucket > 0)) {
|
|
LOG_FN_CONN(conn, (LOG_DEBUG,LD_NET,
|
|
"waking up conn (fd %d) for write", conn->s));
|
|
conn->write_blocked_on_bw = 0;
|
|
connection_start_writing(conn);
|
|
}
|
|
});
|
|
}
|
|
|
|
/** Is the <b>bucket</b> for connection <b>conn</b> low enough that we
|
|
* should add another pile of tokens to it?
|
|
*/
|
|
static int
|
|
connection_bucket_should_increase(int bucket, or_connection_t *conn)
|
|
{
|
|
tor_assert(conn);
|
|
|
|
if (conn->_base.state != OR_CONN_STATE_OPEN)
|
|
return 0; /* only open connections play the rate limiting game */
|
|
if (bucket >= conn->bandwidthburst)
|
|
return 0;
|
|
|
|
return 1;
|
|
}
|
|
|
|
/** Read bytes from conn-\>s and process them.
|
|
*
|
|
* This function gets called from conn_read() in main.c, either
|
|
* when poll() has declared that conn wants to read, or (for OR conns)
|
|
* when there are pending TLS bytes.
|
|
*
|
|
* It calls connection_read_to_buf() to bring in any new bytes,
|
|
* and then calls connection_process_inbuf() to process them.
|
|
*
|
|
* Mark the connection and return -1 if you want to close it, else
|
|
* return 0.
|
|
*/
|
|
static int
|
|
connection_handle_read_impl(connection_t *conn)
|
|
{
|
|
int max_to_read=-1, try_to_read;
|
|
size_t before, n_read = 0;
|
|
int socket_error = 0;
|
|
|
|
if (conn->marked_for_close)
|
|
return 0; /* do nothing */
|
|
|
|
conn->timestamp_lastread = approx_time();
|
|
|
|
switch (conn->type) {
|
|
case CONN_TYPE_OR_LISTENER:
|
|
return connection_handle_listener_read(conn, CONN_TYPE_OR);
|
|
case CONN_TYPE_AP_LISTENER:
|
|
case CONN_TYPE_AP_TRANS_LISTENER:
|
|
case CONN_TYPE_AP_NATD_LISTENER:
|
|
return connection_handle_listener_read(conn, CONN_TYPE_AP);
|
|
case CONN_TYPE_DIR_LISTENER:
|
|
return connection_handle_listener_read(conn, CONN_TYPE_DIR);
|
|
case CONN_TYPE_CONTROL_LISTENER:
|
|
return connection_handle_listener_read(conn, CONN_TYPE_CONTROL);
|
|
case CONN_TYPE_AP_DNS_LISTENER:
|
|
/* This should never happen; eventdns.c handles the reads here. */
|
|
tor_fragile_assert();
|
|
return 0;
|
|
}
|
|
|
|
loop_again:
|
|
try_to_read = max_to_read;
|
|
tor_assert(!conn->marked_for_close);
|
|
|
|
before = buf_datalen(conn->inbuf);
|
|
if (connection_read_to_buf(conn, &max_to_read, &socket_error) < 0) {
|
|
/* There's a read error; kill the connection.*/
|
|
if (conn->type == CONN_TYPE_OR &&
|
|
conn->state == OR_CONN_STATE_CONNECTING) {
|
|
connection_or_connect_failed(TO_OR_CONN(conn),
|
|
errno_to_orconn_end_reason(socket_error),
|
|
tor_socket_strerror(socket_error));
|
|
}
|
|
if (CONN_IS_EDGE(conn)) {
|
|
edge_connection_t *edge_conn = TO_EDGE_CONN(conn);
|
|
connection_edge_end_errno(edge_conn);
|
|
if (edge_conn->socks_request) /* broken, don't send a socks reply back */
|
|
edge_conn->socks_request->has_finished = 1;
|
|
}
|
|
connection_close_immediate(conn); /* Don't flush; connection is dead. */
|
|
connection_mark_for_close(conn);
|
|
return -1;
|
|
}
|
|
n_read += buf_datalen(conn->inbuf) - before;
|
|
if (CONN_IS_EDGE(conn) && try_to_read != max_to_read) {
|
|
/* instruct it not to try to package partial cells. */
|
|
if (connection_process_inbuf(conn, 0) < 0) {
|
|
return -1;
|
|
}
|
|
if (!conn->marked_for_close &&
|
|
connection_is_reading(conn) &&
|
|
!conn->inbuf_reached_eof &&
|
|
max_to_read > 0)
|
|
goto loop_again; /* try reading again, in case more is here now */
|
|
}
|
|
/* one last try, packaging partial cells and all. */
|
|
if (!conn->marked_for_close &&
|
|
connection_process_inbuf(conn, 1) < 0) {
|
|
return -1;
|
|
}
|
|
if (conn->linked_conn) {
|
|
/* The other side's handle_write() will never actually get called, so
|
|
* we need to invoke the appropriate callbacks ourself. */
|
|
connection_t *linked = conn->linked_conn;
|
|
|
|
if (n_read) {
|
|
/* Probably a no-op, but hey. */
|
|
connection_buckets_decrement(linked, approx_time(), n_read, 0);
|
|
|
|
if (connection_flushed_some(linked) < 0)
|
|
connection_mark_for_close(linked);
|
|
if (!connection_wants_to_flush(linked))
|
|
connection_finished_flushing(linked);
|
|
}
|
|
|
|
if (!buf_datalen(linked->outbuf) && conn->active_on_link)
|
|
connection_stop_reading_from_linked_conn(conn);
|
|
}
|
|
/* If we hit the EOF, call connection_reached_eof(). */
|
|
if (!conn->marked_for_close &&
|
|
conn->inbuf_reached_eof &&
|
|
connection_reached_eof(conn) < 0) {
|
|
return -1;
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
int
|
|
connection_handle_read(connection_t *conn)
|
|
{
|
|
int res;
|
|
|
|
tor_gettimeofday_cache_clear();
|
|
res = connection_handle_read_impl(conn);
|
|
return res;
|
|
}
|
|
|
|
/** Pull in new bytes from conn-\>s or conn-\>linked_conn onto conn-\>inbuf,
|
|
* either directly or via TLS. Reduce the token buckets by the number of bytes
|
|
* read.
|
|
*
|
|
* If *max_to_read is -1, then decide it ourselves, else go with the
|
|
* value passed to us. When returning, if it's changed, subtract the
|
|
* number of bytes we read from *max_to_read.
|
|
*
|
|
* Return -1 if we want to break conn, else return 0.
|
|
*/
|
|
static int
|
|
connection_read_to_buf(connection_t *conn, int *max_to_read, int *socket_error)
|
|
{
|
|
int result;
|
|
ssize_t at_most = *max_to_read;
|
|
size_t slack_in_buf, more_to_read;
|
|
size_t n_read = 0, n_written = 0;
|
|
|
|
if (at_most == -1) { /* we need to initialize it */
|
|
/* how many bytes are we allowed to read? */
|
|
at_most = connection_bucket_read_limit(conn, approx_time());
|
|
}
|
|
|
|
slack_in_buf = buf_slack(conn->inbuf);
|
|
again:
|
|
if ((size_t)at_most > slack_in_buf && slack_in_buf >= 1024) {
|
|
more_to_read = at_most - slack_in_buf;
|
|
at_most = slack_in_buf;
|
|
} else {
|
|
more_to_read = 0;
|
|
}
|
|
|
|
if (connection_speaks_cells(conn) &&
|
|
conn->state > OR_CONN_STATE_PROXY_HANDSHAKING) {
|
|
int pending;
|
|
or_connection_t *or_conn = TO_OR_CONN(conn);
|
|
size_t initial_size;
|
|
if (conn->state == OR_CONN_STATE_TLS_HANDSHAKING ||
|
|
conn->state == OR_CONN_STATE_TLS_CLIENT_RENEGOTIATING) {
|
|
/* continue handshaking even if global token bucket is empty */
|
|
return connection_tls_continue_handshake(or_conn);
|
|
}
|
|
|
|
log_debug(LD_NET,
|
|
"%d: starting, inbuf_datalen %ld (%d pending in tls object)."
|
|
" at_most %ld.",
|
|
conn->s,(long)buf_datalen(conn->inbuf),
|
|
tor_tls_get_pending_bytes(or_conn->tls), (long)at_most);
|
|
|
|
initial_size = buf_datalen(conn->inbuf);
|
|
/* else open, or closing */
|
|
result = read_to_buf_tls(or_conn->tls, at_most, conn->inbuf);
|
|
if (TOR_TLS_IS_ERROR(result) || result == TOR_TLS_CLOSE)
|
|
or_conn->tls_error = result;
|
|
else
|
|
or_conn->tls_error = 0;
|
|
|
|
switch (result) {
|
|
case TOR_TLS_CLOSE:
|
|
case TOR_TLS_ERROR_IO:
|
|
log_debug(LD_NET,"TLS connection closed %son read. Closing. "
|
|
"(Nickname %s, address %s)",
|
|
result == TOR_TLS_CLOSE ? "cleanly " : "",
|
|
or_conn->nickname ? or_conn->nickname : "not set",
|
|
conn->address);
|
|
return result;
|
|
CASE_TOR_TLS_ERROR_ANY_NONIO:
|
|
log_debug(LD_NET,"tls error [%s]. breaking (nickname %s, address %s).",
|
|
tor_tls_err_to_string(result),
|
|
or_conn->nickname ? or_conn->nickname : "not set",
|
|
conn->address);
|
|
return result;
|
|
case TOR_TLS_WANTWRITE:
|
|
connection_start_writing(conn);
|
|
return 0;
|
|
case TOR_TLS_WANTREAD: /* we're already reading */
|
|
case TOR_TLS_DONE: /* no data read, so nothing to process */
|
|
result = 0;
|
|
break; /* so we call bucket_decrement below */
|
|
default:
|
|
break;
|
|
}
|
|
pending = tor_tls_get_pending_bytes(or_conn->tls);
|
|
if (pending) {
|
|
/* If we have any pending bytes, we read them now. This *can*
|
|
* take us over our read allotment, but really we shouldn't be
|
|
* believing that SSL bytes are the same as TCP bytes anyway. */
|
|
int r2 = read_to_buf_tls(or_conn->tls, pending, conn->inbuf);
|
|
if (r2<0) {
|
|
log_warn(LD_BUG, "apparently, reading pending bytes can fail.");
|
|
return -1;
|
|
}
|
|
}
|
|
result = (int)(buf_datalen(conn->inbuf)-initial_size);
|
|
tor_tls_get_n_raw_bytes(or_conn->tls, &n_read, &n_written);
|
|
log_debug(LD_GENERAL, "After TLS read of %d: %ld read, %ld written",
|
|
result, (long)n_read, (long)n_written);
|
|
} else if (conn->linked) {
|
|
if (conn->linked_conn) {
|
|
result = move_buf_to_buf(conn->inbuf, conn->linked_conn->outbuf,
|
|
&conn->linked_conn->outbuf_flushlen);
|
|
} else {
|
|
result = 0;
|
|
}
|
|
//log_notice(LD_GENERAL, "Moved %d bytes on an internal link!", result);
|
|
/* If the other side has disappeared, or if it's been marked for close and
|
|
* we flushed its outbuf, then we should set our inbuf_reached_eof. */
|
|
if (!conn->linked_conn ||
|
|
(conn->linked_conn->marked_for_close &&
|
|
buf_datalen(conn->linked_conn->outbuf) == 0))
|
|
conn->inbuf_reached_eof = 1;
|
|
|
|
n_read = (size_t) result;
|
|
} else {
|
|
/* !connection_speaks_cells, !conn->linked_conn. */
|
|
int reached_eof = 0;
|
|
CONN_LOG_PROTECT(conn,
|
|
result = read_to_buf(conn->s, at_most, conn->inbuf, &reached_eof,
|
|
socket_error));
|
|
if (reached_eof)
|
|
conn->inbuf_reached_eof = 1;
|
|
|
|
// log_fn(LOG_DEBUG,"read_to_buf returned %d.",read_result);
|
|
|
|
if (result < 0)
|
|
return -1;
|
|
n_read = (size_t) result;
|
|
}
|
|
|
|
if (n_read > 0) { /* change *max_to_read */
|
|
/*XXXX021 check for overflow*/
|
|
*max_to_read = (int)(at_most - n_read);
|
|
}
|
|
|
|
if (conn->type == CONN_TYPE_AP) {
|
|
edge_connection_t *edge_conn = TO_EDGE_CONN(conn);
|
|
/*XXXX021 check for overflow*/
|
|
edge_conn->n_read += (int)n_read;
|
|
}
|
|
|
|
connection_buckets_decrement(conn, approx_time(), n_read, n_written);
|
|
|
|
if (more_to_read && result == at_most) {
|
|
slack_in_buf = buf_slack(conn->inbuf);
|
|
at_most = more_to_read;
|
|
goto again;
|
|
}
|
|
|
|
/* Call even if result is 0, since the global read bucket may
|
|
* have reached 0 on a different conn, and this guy needs to
|
|
* know to stop reading. */
|
|
connection_consider_empty_read_buckets(conn);
|
|
if (n_written > 0 && connection_is_writing(conn))
|
|
connection_consider_empty_write_buckets(conn);
|
|
|
|
return 0;
|
|
}
|
|
|
|
/** A pass-through to fetch_from_buf. */
|
|
int
|
|
connection_fetch_from_buf(char *string, size_t len, connection_t *conn)
|
|
{
|
|
return fetch_from_buf(string, len, conn->inbuf);
|
|
}
|
|
|
|
/** Return conn-\>outbuf_flushlen: how many bytes conn wants to flush
|
|
* from its outbuf. */
|
|
int
|
|
connection_wants_to_flush(connection_t *conn)
|
|
{
|
|
return conn->outbuf_flushlen > 0;
|
|
}
|
|
|
|
/** Are there too many bytes on edge connection <b>conn</b>'s outbuf to
|
|
* send back a relay-level sendme yet? Return 1 if so, 0 if not. Used by
|
|
* connection_edge_consider_sending_sendme().
|
|
*/
|
|
int
|
|
connection_outbuf_too_full(connection_t *conn)
|
|
{
|
|
return (conn->outbuf_flushlen > 10*CELL_PAYLOAD_SIZE);
|
|
}
|
|
|
|
/** Try to flush more bytes onto conn-\>s.
|
|
*
|
|
* This function gets called either from conn_write() in main.c
|
|
* when poll() has declared that conn wants to write, or below
|
|
* from connection_write_to_buf() when an entire TLS record is ready.
|
|
*
|
|
* Update conn-\>timestamp_lastwritten to now, and call flush_buf
|
|
* or flush_buf_tls appropriately. If it succeeds and there are no more
|
|
* more bytes on conn->outbuf, then call connection_finished_flushing
|
|
* on it too.
|
|
*
|
|
* If <b>force</b>, then write as many bytes as possible, ignoring bandwidth
|
|
* limits. (Used for flushing messages to controller connections on fatal
|
|
* errors.)
|
|
*
|
|
* Mark the connection and return -1 if you want to close it, else
|
|
* return 0.
|
|
*/
|
|
static int
|
|
connection_handle_write_impl(connection_t *conn, int force)
|
|
{
|
|
int e;
|
|
socklen_t len=(socklen_t)sizeof(e);
|
|
int result;
|
|
ssize_t max_to_write;
|
|
time_t now = approx_time();
|
|
size_t n_read = 0, n_written = 0;
|
|
|
|
tor_assert(!connection_is_listener(conn));
|
|
|
|
if (conn->marked_for_close || conn->s < 0)
|
|
return 0; /* do nothing */
|
|
|
|
if (conn->in_flushed_some) {
|
|
log_warn(LD_BUG, "called recursively from inside conn->in_flushed_some");
|
|
return 0;
|
|
}
|
|
|
|
conn->timestamp_lastwritten = now;
|
|
|
|
/* Sometimes, "writable" means "connected". */
|
|
if (connection_state_is_connecting(conn)) {
|
|
if (getsockopt(conn->s, SOL_SOCKET, SO_ERROR, (void*)&e, &len) < 0) {
|
|
log_warn(LD_BUG,
|
|
"getsockopt() syscall failed?! Please report to tor-ops.");
|
|
if (CONN_IS_EDGE(conn))
|
|
connection_edge_end_errno(TO_EDGE_CONN(conn));
|
|
connection_mark_for_close(conn);
|
|
return -1;
|
|
}
|
|
if (e) {
|
|
/* some sort of error, but maybe just inprogress still */
|
|
if (!ERRNO_IS_CONN_EINPROGRESS(e)) {
|
|
log_info(LD_NET,"in-progress connect failed. Removing. (%s)",
|
|
tor_socket_strerror(e));
|
|
if (CONN_IS_EDGE(conn))
|
|
connection_edge_end_errno(TO_EDGE_CONN(conn));
|
|
if (conn->type == CONN_TYPE_OR)
|
|
connection_or_connect_failed(TO_OR_CONN(conn),
|
|
errno_to_orconn_end_reason(e),
|
|
tor_socket_strerror(e));
|
|
|
|
connection_close_immediate(conn);
|
|
connection_mark_for_close(conn);
|
|
return -1;
|
|
} else {
|
|
return 0; /* no change, see if next time is better */
|
|
}
|
|
}
|
|
/* The connection is successful. */
|
|
if (connection_finished_connecting(conn)<0)
|
|
return -1;
|
|
}
|
|
|
|
max_to_write = force ? (ssize_t)conn->outbuf_flushlen
|
|
: connection_bucket_write_limit(conn, now);
|
|
|
|
if (connection_speaks_cells(conn) &&
|
|
conn->state > OR_CONN_STATE_PROXY_HANDSHAKING) {
|
|
or_connection_t *or_conn = TO_OR_CONN(conn);
|
|
if (conn->state == OR_CONN_STATE_TLS_HANDSHAKING ||
|
|
conn->state == OR_CONN_STATE_TLS_CLIENT_RENEGOTIATING) {
|
|
connection_stop_writing(conn);
|
|
if (connection_tls_continue_handshake(or_conn) < 0) {
|
|
/* Don't flush; connection is dead. */
|
|
connection_close_immediate(conn);
|
|
connection_mark_for_close(conn);
|
|
return -1;
|
|
}
|
|
return 0;
|
|
} else if (conn->state == OR_CONN_STATE_TLS_SERVER_RENEGOTIATING) {
|
|
return connection_handle_read(conn);
|
|
}
|
|
|
|
/* else open, or closing */
|
|
result = flush_buf_tls(or_conn->tls, conn->outbuf,
|
|
max_to_write, &conn->outbuf_flushlen);
|
|
|
|
/* If we just flushed the last bytes, check if this tunneled dir
|
|
* request is done. */
|
|
if (buf_datalen(conn->outbuf) == 0 && conn->dirreq_id)
|
|
geoip_change_dirreq_state(conn->dirreq_id, DIRREQ_TUNNELED,
|
|
DIRREQ_OR_CONN_BUFFER_FLUSHED);
|
|
|
|
switch (result) {
|
|
CASE_TOR_TLS_ERROR_ANY:
|
|
case TOR_TLS_CLOSE:
|
|
log_info(LD_NET,result!=TOR_TLS_CLOSE?
|
|
"tls error. breaking.":"TLS connection closed on flush");
|
|
/* Don't flush; connection is dead. */
|
|
connection_close_immediate(conn);
|
|
connection_mark_for_close(conn);
|
|
return -1;
|
|
case TOR_TLS_WANTWRITE:
|
|
log_debug(LD_NET,"wanted write.");
|
|
/* we're already writing */
|
|
return 0;
|
|
case TOR_TLS_WANTREAD:
|
|
/* Make sure to avoid a loop if the receive buckets are empty. */
|
|
log_debug(LD_NET,"wanted read.");
|
|
if (!connection_is_reading(conn)) {
|
|
connection_stop_writing(conn);
|
|
conn->write_blocked_on_bw = 1;
|
|
/* we'll start reading again when we get more tokens in our
|
|
* read bucket; then we'll start writing again too.
|
|
*/
|
|
}
|
|
/* else no problem, we're already reading */
|
|
return 0;
|
|
/* case TOR_TLS_DONE:
|
|
* for TOR_TLS_DONE, fall through to check if the flushlen
|
|
* is empty, so we can stop writing.
|
|
*/
|
|
}
|
|
|
|
tor_tls_get_n_raw_bytes(or_conn->tls, &n_read, &n_written);
|
|
log_debug(LD_GENERAL, "After TLS write of %d: %ld read, %ld written",
|
|
result, (long)n_read, (long)n_written);
|
|
} else {
|
|
CONN_LOG_PROTECT(conn,
|
|
result = flush_buf(conn->s, conn->outbuf,
|
|
max_to_write, &conn->outbuf_flushlen));
|
|
if (result < 0) {
|
|
if (CONN_IS_EDGE(conn))
|
|
connection_edge_end_errno(TO_EDGE_CONN(conn));
|
|
|
|
connection_close_immediate(conn); /* Don't flush; connection is dead. */
|
|
connection_mark_for_close(conn);
|
|
return -1;
|
|
}
|
|
n_written = (size_t) result;
|
|
}
|
|
|
|
if (conn->type == CONN_TYPE_AP) {
|
|
edge_connection_t *edge_conn = TO_EDGE_CONN(conn);
|
|
/*XXXX021 check for overflow.*/
|
|
edge_conn->n_written += (int)n_written;
|
|
}
|
|
|
|
connection_buckets_decrement(conn, approx_time(), n_read, n_written);
|
|
|
|
if (result > 0) {
|
|
/* If we wrote any bytes from our buffer, then call the appropriate
|
|
* functions. */
|
|
if (connection_flushed_some(conn) < 0)
|
|
connection_mark_for_close(conn);
|
|
}
|
|
|
|
if (!connection_wants_to_flush(conn)) { /* it's done flushing */
|
|
if (connection_finished_flushing(conn) < 0) {
|
|
/* already marked */
|
|
return -1;
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
/* Call even if result is 0, since the global write bucket may
|
|
* have reached 0 on a different conn, and this guy needs to
|
|
* know to stop writing. */
|
|
connection_consider_empty_write_buckets(conn);
|
|
if (n_read > 0 && connection_is_reading(conn))
|
|
connection_consider_empty_read_buckets(conn);
|
|
|
|
return 0;
|
|
}
|
|
|
|
int
|
|
connection_handle_write(connection_t *conn, int force)
|
|
{
|
|
int res;
|
|
tor_gettimeofday_cache_clear();
|
|
res = connection_handle_write_impl(conn, force);
|
|
return res;
|
|
}
|
|
|
|
/** OpenSSL TLS record size is 16383; this is close. The goal here is to
|
|
* push data out as soon as we know there's enough for a TLS record, so
|
|
* during periods of high load we won't read entire megabytes from
|
|
* input before pushing any data out. It also has the feature of not
|
|
* growing huge outbufs unless something is slow. */
|
|
#define MIN_TLS_FLUSHLEN 15872
|
|
|
|
/** Append <b>len</b> bytes of <b>string</b> onto <b>conn</b>'s
|
|
* outbuf, and ask it to start writing.
|
|
*
|
|
* If <b>zlib</b> is nonzero, this is a directory connection that should get
|
|
* its contents compressed or decompressed as they're written. If zlib is
|
|
* negative, this is the last data to be compressed, and the connection's zlib
|
|
* state should be flushed.
|
|
*
|
|
* If it's an OR conn and an entire TLS record is ready, then try to
|
|
* flush the record now. Similarly, if it's a local control connection
|
|
* and a 64k chunk is ready, try to flush it all, so we don't end up with
|
|
* many megabytes of controller info queued at once.
|
|
*/
|
|
void
|
|
_connection_write_to_buf_impl(const char *string, size_t len,
|
|
connection_t *conn, int zlib)
|
|
{
|
|
/* XXXX This function really needs to return -1 on failure. */
|
|
int r;
|
|
size_t old_datalen;
|
|
if (!len && !(zlib<0))
|
|
return;
|
|
/* if it's marked for close, only allow write if we mean to flush it */
|
|
if (conn->marked_for_close && !conn->hold_open_until_flushed)
|
|
return;
|
|
|
|
old_datalen = buf_datalen(conn->outbuf);
|
|
if (zlib) {
|
|
dir_connection_t *dir_conn = TO_DIR_CONN(conn);
|
|
int done = zlib < 0;
|
|
CONN_LOG_PROTECT(conn, r = write_to_buf_zlib(conn->outbuf,
|
|
dir_conn->zlib_state,
|
|
string, len, done));
|
|
} else {
|
|
CONN_LOG_PROTECT(conn, r = write_to_buf(string, len, conn->outbuf));
|
|
}
|
|
if (r < 0) {
|
|
if (CONN_IS_EDGE(conn)) {
|
|
/* if it failed, it means we have our package/delivery windows set
|
|
wrong compared to our max outbuf size. close the whole circuit. */
|
|
log_warn(LD_NET,
|
|
"write_to_buf failed. Closing circuit (fd %d).", conn->s);
|
|
circuit_mark_for_close(circuit_get_by_edge_conn(TO_EDGE_CONN(conn)),
|
|
END_CIRC_REASON_INTERNAL);
|
|
} else {
|
|
log_warn(LD_NET,
|
|
"write_to_buf failed. Closing connection (fd %d).", conn->s);
|
|
connection_mark_for_close(conn);
|
|
}
|
|
return;
|
|
}
|
|
|
|
connection_start_writing(conn);
|
|
if (zlib) {
|
|
conn->outbuf_flushlen += buf_datalen(conn->outbuf) - old_datalen;
|
|
} else {
|
|
ssize_t extra = 0;
|
|
conn->outbuf_flushlen += len;
|
|
|
|
/* Should we try flushing the outbuf now? */
|
|
if (conn->in_flushed_some) {
|
|
/* Don't flush the outbuf when the reason we're writing more stuff is
|
|
* _because_ we flushed the outbuf. That's unfair. */
|
|
return;
|
|
}
|
|
|
|
if (conn->type == CONN_TYPE_OR &&
|
|
conn->outbuf_flushlen-len < MIN_TLS_FLUSHLEN &&
|
|
conn->outbuf_flushlen >= MIN_TLS_FLUSHLEN) {
|
|
/* We just pushed outbuf_flushlen to MIN_TLS_FLUSHLEN or above;
|
|
* we can send out a full TLS frame now if we like. */
|
|
extra = conn->outbuf_flushlen - MIN_TLS_FLUSHLEN;
|
|
conn->outbuf_flushlen = MIN_TLS_FLUSHLEN;
|
|
} else if (conn->type == CONN_TYPE_CONTROL &&
|
|
!connection_is_rate_limited(conn) &&
|
|
conn->outbuf_flushlen-len < 1<<16 &&
|
|
conn->outbuf_flushlen >= 1<<16) {
|
|
/* just try to flush all of it */
|
|
} else
|
|
return; /* no need to try flushing */
|
|
|
|
if (connection_handle_write(conn, 0) < 0) {
|
|
if (!conn->marked_for_close) {
|
|
/* this connection is broken. remove it. */
|
|
log_warn(LD_BUG, "unhandled error on write for "
|
|
"conn (type %d, fd %d); removing",
|
|
conn->type, conn->s);
|
|
tor_fragile_assert();
|
|
/* do a close-immediate here, so we don't try to flush */
|
|
connection_close_immediate(conn);
|
|
}
|
|
return;
|
|
}
|
|
if (extra) {
|
|
conn->outbuf_flushlen += extra;
|
|
connection_start_writing(conn);
|
|
}
|
|
}
|
|
}
|
|
|
|
/** Return a connection with given type, address, port, and purpose;
|
|
* or NULL if no such connection exists. */
|
|
connection_t *
|
|
connection_get_by_type_addr_port_purpose(int type,
|
|
const tor_addr_t *addr, uint16_t port,
|
|
int purpose)
|
|
{
|
|
smartlist_t *conns = get_connection_array();
|
|
SMARTLIST_FOREACH(conns, connection_t *, conn,
|
|
{
|
|
if (conn->type == type &&
|
|
tor_addr_eq(&conn->addr, addr) &&
|
|
conn->port == port &&
|
|
conn->purpose == purpose &&
|
|
!conn->marked_for_close)
|
|
return conn;
|
|
});
|
|
return NULL;
|
|
}
|
|
|
|
/** Return the stream with id <b>id</b> if it is not already marked for
|
|
* close.
|
|
*/
|
|
connection_t *
|
|
connection_get_by_global_id(uint64_t id)
|
|
{
|
|
smartlist_t *conns = get_connection_array();
|
|
SMARTLIST_FOREACH(conns, connection_t *, conn,
|
|
{
|
|
if (conn->global_identifier == id)
|
|
return conn;
|
|
});
|
|
return NULL;
|
|
}
|
|
|
|
/** Return a connection of type <b>type</b> that is not marked for close.
|
|
*/
|
|
connection_t *
|
|
connection_get_by_type(int type)
|
|
{
|
|
smartlist_t *conns = get_connection_array();
|
|
SMARTLIST_FOREACH(conns, connection_t *, conn,
|
|
{
|
|
if (conn->type == type && !conn->marked_for_close)
|
|
return conn;
|
|
});
|
|
return NULL;
|
|
}
|
|
|
|
/** Return a connection of type <b>type</b> that is in state <b>state</b>,
|
|
* and that is not marked for close.
|
|
*/
|
|
connection_t *
|
|
connection_get_by_type_state(int type, int state)
|
|
{
|
|
smartlist_t *conns = get_connection_array();
|
|
SMARTLIST_FOREACH(conns, connection_t *, conn,
|
|
{
|
|
if (conn->type == type && conn->state == state && !conn->marked_for_close)
|
|
return conn;
|
|
});
|
|
return NULL;
|
|
}
|
|
|
|
/** Return a connection of type <b>type</b> that has rendquery equal
|
|
* to <b>rendquery</b>, and that is not marked for close. If state
|
|
* is non-zero, conn must be of that state too.
|
|
*/
|
|
connection_t *
|
|
connection_get_by_type_state_rendquery(int type, int state,
|
|
const char *rendquery)
|
|
{
|
|
smartlist_t *conns = get_connection_array();
|
|
|
|
tor_assert(type == CONN_TYPE_DIR ||
|
|
type == CONN_TYPE_AP || type == CONN_TYPE_EXIT);
|
|
tor_assert(rendquery);
|
|
|
|
SMARTLIST_FOREACH(conns, connection_t *, conn,
|
|
{
|
|
if (conn->type == type &&
|
|
!conn->marked_for_close &&
|
|
(!state || state == conn->state)) {
|
|
if (type == CONN_TYPE_DIR &&
|
|
TO_DIR_CONN(conn)->rend_data &&
|
|
!rend_cmp_service_ids(rendquery,
|
|
TO_DIR_CONN(conn)->rend_data->onion_address))
|
|
return conn;
|
|
else if (CONN_IS_EDGE(conn) &&
|
|
TO_EDGE_CONN(conn)->rend_data &&
|
|
!rend_cmp_service_ids(rendquery,
|
|
TO_EDGE_CONN(conn)->rend_data->onion_address))
|
|
return conn;
|
|
}
|
|
});
|
|
return NULL;
|
|
}
|
|
|
|
/** Return an open, non-marked connection of a given type and purpose, or NULL
|
|
* if no such connection exists. */
|
|
connection_t *
|
|
connection_get_by_type_purpose(int type, int purpose)
|
|
{
|
|
smartlist_t *conns = get_connection_array();
|
|
SMARTLIST_FOREACH(conns, connection_t *, conn,
|
|
{
|
|
if (conn->type == type &&
|
|
!conn->marked_for_close &&
|
|
(purpose == conn->purpose))
|
|
return conn;
|
|
});
|
|
return NULL;
|
|
}
|
|
|
|
/** Return 1 if <b>conn</b> is a listener conn, else return 0. */
|
|
int
|
|
connection_is_listener(connection_t *conn)
|
|
{
|
|
if (conn->type == CONN_TYPE_OR_LISTENER ||
|
|
conn->type == CONN_TYPE_AP_LISTENER ||
|
|
conn->type == CONN_TYPE_AP_TRANS_LISTENER ||
|
|
conn->type == CONN_TYPE_AP_DNS_LISTENER ||
|
|
conn->type == CONN_TYPE_AP_NATD_LISTENER ||
|
|
conn->type == CONN_TYPE_DIR_LISTENER ||
|
|
conn->type == CONN_TYPE_CONTROL_LISTENER)
|
|
return 1;
|
|
return 0;
|
|
}
|
|
|
|
/** Return 1 if <b>conn</b> is in state "open" and is not marked
|
|
* for close, else return 0.
|
|
*/
|
|
int
|
|
connection_state_is_open(connection_t *conn)
|
|
{
|
|
tor_assert(conn);
|
|
|
|
if (conn->marked_for_close)
|
|
return 0;
|
|
|
|
if ((conn->type == CONN_TYPE_OR && conn->state == OR_CONN_STATE_OPEN) ||
|
|
(conn->type == CONN_TYPE_AP && conn->state == AP_CONN_STATE_OPEN) ||
|
|
(conn->type == CONN_TYPE_EXIT && conn->state == EXIT_CONN_STATE_OPEN) ||
|
|
(conn->type == CONN_TYPE_CONTROL &&
|
|
conn->state == CONTROL_CONN_STATE_OPEN))
|
|
return 1;
|
|
|
|
return 0;
|
|
}
|
|
|
|
/** Return 1 if conn is in 'connecting' state, else return 0. */
|
|
int
|
|
connection_state_is_connecting(connection_t *conn)
|
|
{
|
|
tor_assert(conn);
|
|
|
|
if (conn->marked_for_close)
|
|
return 0;
|
|
switch (conn->type)
|
|
{
|
|
case CONN_TYPE_OR:
|
|
return conn->state == OR_CONN_STATE_CONNECTING;
|
|
case CONN_TYPE_EXIT:
|
|
return conn->state == EXIT_CONN_STATE_CONNECTING;
|
|
case CONN_TYPE_DIR:
|
|
return conn->state == DIR_CONN_STATE_CONNECTING;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
/** Allocates a base64'ed authenticator for use in http or https
|
|
* auth, based on the input string <b>authenticator</b>. Returns it
|
|
* if success, else returns NULL. */
|
|
char *
|
|
alloc_http_authenticator(const char *authenticator)
|
|
{
|
|
/* an authenticator in Basic authentication
|
|
* is just the string "username:password" */
|
|
const size_t authenticator_length = strlen(authenticator);
|
|
/* The base64_encode function needs a minimum buffer length
|
|
* of 66 bytes. */
|
|
const size_t base64_authenticator_length = (authenticator_length/48+1)*66;
|
|
char *base64_authenticator = tor_malloc(base64_authenticator_length);
|
|
if (base64_encode(base64_authenticator, base64_authenticator_length,
|
|
authenticator, authenticator_length) < 0) {
|
|
tor_free(base64_authenticator); /* free and set to null */
|
|
} else {
|
|
/* remove extra \n at end of encoding */
|
|
base64_authenticator[strlen(base64_authenticator) - 1] = 0;
|
|
}
|
|
return base64_authenticator;
|
|
}
|
|
|
|
/** Given a socket handle, check whether the local address (sockname) of the
|
|
* socket is one that we've connected from before. If so, double-check
|
|
* whether our address has changed and we need to generate keys. If we do,
|
|
* call init_keys().
|
|
*/
|
|
static void
|
|
client_check_address_changed(int sock)
|
|
{
|
|
uint32_t iface_ip, ip_out;
|
|
struct sockaddr_in out_addr;
|
|
socklen_t out_addr_len = (socklen_t) sizeof(out_addr);
|
|
uint32_t *ip;
|
|
|
|
if (!last_interface_ip)
|
|
get_interface_address(LOG_INFO, &last_interface_ip);
|
|
if (!outgoing_addrs)
|
|
outgoing_addrs = smartlist_create();
|
|
|
|
if (getsockname(sock, (struct sockaddr*)&out_addr, &out_addr_len)<0) {
|
|
int e = tor_socket_errno(sock);
|
|
log_warn(LD_NET, "getsockname() to check for address change failed: %s",
|
|
tor_socket_strerror(e));
|
|
return;
|
|
}
|
|
|
|
/* If we've used this address previously, we're okay. */
|
|
ip_out = ntohl(out_addr.sin_addr.s_addr);
|
|
SMARTLIST_FOREACH(outgoing_addrs, uint32_t*, ip_ptr,
|
|
if (*ip_ptr == ip_out) return;
|
|
);
|
|
|
|
/* Uh-oh. We haven't connected from this address before. Has the interface
|
|
* address changed? */
|
|
if (get_interface_address(LOG_INFO, &iface_ip)<0)
|
|
return;
|
|
ip = tor_malloc(sizeof(uint32_t));
|
|
*ip = ip_out;
|
|
|
|
if (iface_ip == last_interface_ip) {
|
|
/* Nope, it hasn't changed. Add this address to the list. */
|
|
smartlist_add(outgoing_addrs, ip);
|
|
} else {
|
|
/* The interface changed. We're a client, so we need to regenerate our
|
|
* keys. First, reset the state. */
|
|
log(LOG_NOTICE, LD_NET, "Our IP address has changed. Rotating keys...");
|
|
last_interface_ip = iface_ip;
|
|
SMARTLIST_FOREACH(outgoing_addrs, void*, ip_ptr, tor_free(ip_ptr));
|
|
smartlist_clear(outgoing_addrs);
|
|
smartlist_add(outgoing_addrs, ip);
|
|
/* Okay, now change our keys. */
|
|
ip_address_changed(1);
|
|
}
|
|
}
|
|
|
|
/** Some systems have limited system buffers for recv and xmit on
|
|
* sockets allocated in a virtual server or similar environment. For a Tor
|
|
* server this can produce the "Error creating network socket: No buffer
|
|
* space available" error once all available TCP buffer space is consumed.
|
|
* This method will attempt to constrain the buffers allocated for the socket
|
|
* to the desired size to stay below system TCP buffer limits.
|
|
*/
|
|
static void
|
|
set_constrained_socket_buffers(int sock, int size)
|
|
{
|
|
void *sz = (void*)&size;
|
|
socklen_t sz_sz = (socklen_t) sizeof(size);
|
|
if (setsockopt(sock, SOL_SOCKET, SO_SNDBUF, sz, sz_sz) < 0) {
|
|
int e = tor_socket_errno(sock);
|
|
log_warn(LD_NET, "setsockopt() to constrain send "
|
|
"buffer to %d bytes failed: %s", size, tor_socket_strerror(e));
|
|
}
|
|
if (setsockopt(sock, SOL_SOCKET, SO_RCVBUF, sz, sz_sz) < 0) {
|
|
int e = tor_socket_errno(sock);
|
|
log_warn(LD_NET, "setsockopt() to constrain recv "
|
|
"buffer to %d bytes failed: %s", size, tor_socket_strerror(e));
|
|
}
|
|
}
|
|
|
|
/** Process new bytes that have arrived on conn-\>inbuf.
|
|
*
|
|
* This function just passes conn to the connection-specific
|
|
* connection_*_process_inbuf() function. It also passes in
|
|
* package_partial if wanted.
|
|
*/
|
|
static int
|
|
connection_process_inbuf(connection_t *conn, int package_partial)
|
|
{
|
|
tor_assert(conn);
|
|
|
|
switch (conn->type) {
|
|
case CONN_TYPE_OR:
|
|
return connection_or_process_inbuf(TO_OR_CONN(conn));
|
|
case CONN_TYPE_EXIT:
|
|
case CONN_TYPE_AP:
|
|
return connection_edge_process_inbuf(TO_EDGE_CONN(conn),
|
|
package_partial);
|
|
case CONN_TYPE_DIR:
|
|
return connection_dir_process_inbuf(TO_DIR_CONN(conn));
|
|
case CONN_TYPE_CPUWORKER:
|
|
return connection_cpu_process_inbuf(conn);
|
|
case CONN_TYPE_CONTROL:
|
|
return connection_control_process_inbuf(TO_CONTROL_CONN(conn));
|
|
default:
|
|
log_err(LD_BUG,"got unexpected conn type %d.", conn->type);
|
|
tor_fragile_assert();
|
|
return -1;
|
|
}
|
|
}
|
|
|
|
/** Called whenever we've written data on a connection. */
|
|
static int
|
|
connection_flushed_some(connection_t *conn)
|
|
{
|
|
int r = 0;
|
|
tor_assert(!conn->in_flushed_some);
|
|
conn->in_flushed_some = 1;
|
|
if (conn->type == CONN_TYPE_DIR &&
|
|
conn->state == DIR_CONN_STATE_SERVER_WRITING) {
|
|
r = connection_dirserv_flushed_some(TO_DIR_CONN(conn));
|
|
} else if (conn->type == CONN_TYPE_OR) {
|
|
r = connection_or_flushed_some(TO_OR_CONN(conn));
|
|
}
|
|
conn->in_flushed_some = 0;
|
|
return r;
|
|
}
|
|
|
|
/** We just finished flushing bytes from conn-\>outbuf, and there
|
|
* are no more bytes remaining.
|
|
*
|
|
* This function just passes conn to the connection-specific
|
|
* connection_*_finished_flushing() function.
|
|
*/
|
|
static int
|
|
connection_finished_flushing(connection_t *conn)
|
|
{
|
|
tor_assert(conn);
|
|
|
|
/* If the connection is closed, don't try to do anything more here. */
|
|
if (CONN_IS_CLOSED(conn))
|
|
return 0;
|
|
|
|
// log_fn(LOG_DEBUG,"entered. Socket %u.", conn->s);
|
|
|
|
switch (conn->type) {
|
|
case CONN_TYPE_OR:
|
|
return connection_or_finished_flushing(TO_OR_CONN(conn));
|
|
case CONN_TYPE_AP:
|
|
case CONN_TYPE_EXIT:
|
|
return connection_edge_finished_flushing(TO_EDGE_CONN(conn));
|
|
case CONN_TYPE_DIR:
|
|
return connection_dir_finished_flushing(TO_DIR_CONN(conn));
|
|
case CONN_TYPE_CPUWORKER:
|
|
return connection_cpu_finished_flushing(conn);
|
|
case CONN_TYPE_CONTROL:
|
|
return connection_control_finished_flushing(TO_CONTROL_CONN(conn));
|
|
default:
|
|
log_err(LD_BUG,"got unexpected conn type %d.", conn->type);
|
|
tor_fragile_assert();
|
|
return -1;
|
|
}
|
|
}
|
|
|
|
/** Called when our attempt to connect() to another server has just
|
|
* succeeded.
|
|
*
|
|
* This function just passes conn to the connection-specific
|
|
* connection_*_finished_connecting() function.
|
|
*/
|
|
static int
|
|
connection_finished_connecting(connection_t *conn)
|
|
{
|
|
tor_assert(conn);
|
|
switch (conn->type)
|
|
{
|
|
case CONN_TYPE_OR:
|
|
return connection_or_finished_connecting(TO_OR_CONN(conn));
|
|
case CONN_TYPE_EXIT:
|
|
return connection_edge_finished_connecting(TO_EDGE_CONN(conn));
|
|
case CONN_TYPE_DIR:
|
|
return connection_dir_finished_connecting(TO_DIR_CONN(conn));
|
|
default:
|
|
log_err(LD_BUG,"got unexpected conn type %d.", conn->type);
|
|
tor_fragile_assert();
|
|
return -1;
|
|
}
|
|
}
|
|
|
|
/** Callback: invoked when a connection reaches an EOF event. */
|
|
static int
|
|
connection_reached_eof(connection_t *conn)
|
|
{
|
|
switch (conn->type) {
|
|
case CONN_TYPE_OR:
|
|
return connection_or_reached_eof(TO_OR_CONN(conn));
|
|
case CONN_TYPE_AP:
|
|
case CONN_TYPE_EXIT:
|
|
return connection_edge_reached_eof(TO_EDGE_CONN(conn));
|
|
case CONN_TYPE_DIR:
|
|
return connection_dir_reached_eof(TO_DIR_CONN(conn));
|
|
case CONN_TYPE_CPUWORKER:
|
|
return connection_cpu_reached_eof(conn);
|
|
case CONN_TYPE_CONTROL:
|
|
return connection_control_reached_eof(TO_CONTROL_CONN(conn));
|
|
default:
|
|
log_err(LD_BUG,"got unexpected conn type %d.", conn->type);
|
|
tor_fragile_assert();
|
|
return -1;
|
|
}
|
|
}
|
|
|
|
/** Log how many bytes are used by buffers of different kinds and sizes. */
|
|
void
|
|
connection_dump_buffer_mem_stats(int severity)
|
|
{
|
|
uint64_t used_by_type[_CONN_TYPE_MAX+1];
|
|
uint64_t alloc_by_type[_CONN_TYPE_MAX+1];
|
|
int n_conns_by_type[_CONN_TYPE_MAX+1];
|
|
uint64_t total_alloc = 0;
|
|
uint64_t total_used = 0;
|
|
int i;
|
|
smartlist_t *conns = get_connection_array();
|
|
|
|
memset(used_by_type, 0, sizeof(used_by_type));
|
|
memset(alloc_by_type, 0, sizeof(alloc_by_type));
|
|
memset(n_conns_by_type, 0, sizeof(n_conns_by_type));
|
|
|
|
SMARTLIST_FOREACH(conns, connection_t *, c,
|
|
{
|
|
int tp = c->type;
|
|
++n_conns_by_type[tp];
|
|
if (c->inbuf) {
|
|
used_by_type[tp] += buf_datalen(c->inbuf);
|
|
alloc_by_type[tp] += buf_allocation(c->inbuf);
|
|
}
|
|
if (c->outbuf) {
|
|
used_by_type[tp] += buf_datalen(c->outbuf);
|
|
alloc_by_type[tp] += buf_allocation(c->outbuf);
|
|
}
|
|
});
|
|
for (i=0; i <= _CONN_TYPE_MAX; ++i) {
|
|
total_used += used_by_type[i];
|
|
total_alloc += alloc_by_type[i];
|
|
}
|
|
|
|
log(severity, LD_GENERAL,
|
|
"In buffers for %d connections: "U64_FORMAT" used/"U64_FORMAT" allocated",
|
|
smartlist_len(conns),
|
|
U64_PRINTF_ARG(total_used), U64_PRINTF_ARG(total_alloc));
|
|
for (i=_CONN_TYPE_MIN; i <= _CONN_TYPE_MAX; ++i) {
|
|
if (!n_conns_by_type[i])
|
|
continue;
|
|
log(severity, LD_GENERAL,
|
|
" For %d %s connections: "U64_FORMAT" used/"U64_FORMAT" allocated",
|
|
n_conns_by_type[i], conn_type_to_string(i),
|
|
U64_PRINTF_ARG(used_by_type[i]), U64_PRINTF_ARG(alloc_by_type[i]));
|
|
}
|
|
}
|
|
|
|
/** Verify that connection <b>conn</b> has all of its invariants
|
|
* correct. Trigger an assert if anything is invalid.
|
|
*/
|
|
void
|
|
assert_connection_ok(connection_t *conn, time_t now)
|
|
{
|
|
(void) now; /* XXXX unused. */
|
|
tor_assert(conn);
|
|
tor_assert(conn->type >= _CONN_TYPE_MIN);
|
|
tor_assert(conn->type <= _CONN_TYPE_MAX);
|
|
switch (conn->type) {
|
|
case CONN_TYPE_OR:
|
|
tor_assert(conn->magic == OR_CONNECTION_MAGIC);
|
|
break;
|
|
case CONN_TYPE_AP:
|
|
case CONN_TYPE_EXIT:
|
|
tor_assert(conn->magic == EDGE_CONNECTION_MAGIC);
|
|
break;
|
|
case CONN_TYPE_DIR:
|
|
tor_assert(conn->magic == DIR_CONNECTION_MAGIC);
|
|
break;
|
|
case CONN_TYPE_CONTROL:
|
|
tor_assert(conn->magic == CONTROL_CONNECTION_MAGIC);
|
|
break;
|
|
default:
|
|
tor_assert(conn->magic == BASE_CONNECTION_MAGIC);
|
|
break;
|
|
}
|
|
|
|
if (conn->linked_conn) {
|
|
tor_assert(conn->linked_conn->linked_conn == conn);
|
|
tor_assert(conn->linked);
|
|
}
|
|
if (conn->linked)
|
|
tor_assert(conn->s < 0);
|
|
|
|
if (conn->outbuf_flushlen > 0) {
|
|
tor_assert(connection_is_writing(conn) || conn->write_blocked_on_bw ||
|
|
(CONN_IS_EDGE(conn) && TO_EDGE_CONN(conn)->edge_blocked_on_circ));
|
|
}
|
|
|
|
if (conn->hold_open_until_flushed)
|
|
tor_assert(conn->marked_for_close);
|
|
|
|
/* XXXX check: read_blocked_on_bw, write_blocked_on_bw, s, conn_array_index,
|
|
* marked_for_close. */
|
|
|
|
/* buffers */
|
|
if (!connection_is_listener(conn)) {
|
|
assert_buf_ok(conn->inbuf);
|
|
assert_buf_ok(conn->outbuf);
|
|
}
|
|
|
|
if (conn->type == CONN_TYPE_OR) {
|
|
or_connection_t *or_conn = TO_OR_CONN(conn);
|
|
if (conn->state == OR_CONN_STATE_OPEN) {
|
|
/* tor_assert(conn->bandwidth > 0); */
|
|
/* the above isn't necessarily true: if we just did a TLS
|
|
* handshake but we didn't recognize the other peer, or it
|
|
* gave a bad cert/etc, then we won't have assigned bandwidth,
|
|
* yet it will be open. -RD
|
|
*/
|
|
// tor_assert(conn->read_bucket >= 0);
|
|
}
|
|
// tor_assert(conn->addr && conn->port);
|
|
tor_assert(conn->address);
|
|
if (conn->state > OR_CONN_STATE_PROXY_HANDSHAKING)
|
|
tor_assert(or_conn->tls);
|
|
}
|
|
|
|
if (CONN_IS_EDGE(conn)) {
|
|
edge_connection_t *edge_conn = TO_EDGE_CONN(conn);
|
|
if (edge_conn->chosen_exit_optional || edge_conn->chosen_exit_retries) {
|
|
tor_assert(conn->type == CONN_TYPE_AP);
|
|
tor_assert(edge_conn->chosen_exit_name);
|
|
}
|
|
|
|
/* XXX unchecked: package window, deliver window. */
|
|
if (conn->type == CONN_TYPE_AP) {
|
|
|
|
tor_assert(edge_conn->socks_request);
|
|
if (conn->state == AP_CONN_STATE_OPEN) {
|
|
tor_assert(edge_conn->socks_request->has_finished);
|
|
if (!conn->marked_for_close) {
|
|
tor_assert(edge_conn->cpath_layer);
|
|
assert_cpath_layer_ok(edge_conn->cpath_layer);
|
|
}
|
|
}
|
|
}
|
|
if (conn->type == CONN_TYPE_EXIT) {
|
|
tor_assert(conn->purpose == EXIT_PURPOSE_CONNECT ||
|
|
conn->purpose == EXIT_PURPOSE_RESOLVE);
|
|
}
|
|
} else if (conn->type == CONN_TYPE_DIR) {
|
|
} else {
|
|
/* Purpose is only used for dir and exit types currently */
|
|
tor_assert(!conn->purpose);
|
|
}
|
|
|
|
switch (conn->type)
|
|
{
|
|
case CONN_TYPE_OR_LISTENER:
|
|
case CONN_TYPE_AP_LISTENER:
|
|
case CONN_TYPE_AP_TRANS_LISTENER:
|
|
case CONN_TYPE_AP_NATD_LISTENER:
|
|
case CONN_TYPE_DIR_LISTENER:
|
|
case CONN_TYPE_CONTROL_LISTENER:
|
|
case CONN_TYPE_AP_DNS_LISTENER:
|
|
tor_assert(conn->state == LISTENER_STATE_READY);
|
|
break;
|
|
case CONN_TYPE_OR:
|
|
tor_assert(conn->state >= _OR_CONN_STATE_MIN);
|
|
tor_assert(conn->state <= _OR_CONN_STATE_MAX);
|
|
tor_assert(TO_OR_CONN(conn)->n_circuits >= 0);
|
|
break;
|
|
case CONN_TYPE_EXIT:
|
|
tor_assert(conn->state >= _EXIT_CONN_STATE_MIN);
|
|
tor_assert(conn->state <= _EXIT_CONN_STATE_MAX);
|
|
tor_assert(conn->purpose >= _EXIT_PURPOSE_MIN);
|
|
tor_assert(conn->purpose <= _EXIT_PURPOSE_MAX);
|
|
break;
|
|
case CONN_TYPE_AP:
|
|
tor_assert(conn->state >= _AP_CONN_STATE_MIN);
|
|
tor_assert(conn->state <= _AP_CONN_STATE_MAX);
|
|
tor_assert(TO_EDGE_CONN(conn)->socks_request);
|
|
break;
|
|
case CONN_TYPE_DIR:
|
|
tor_assert(conn->state >= _DIR_CONN_STATE_MIN);
|
|
tor_assert(conn->state <= _DIR_CONN_STATE_MAX);
|
|
tor_assert(conn->purpose >= _DIR_PURPOSE_MIN);
|
|
tor_assert(conn->purpose <= _DIR_PURPOSE_MAX);
|
|
break;
|
|
case CONN_TYPE_CPUWORKER:
|
|
tor_assert(conn->state >= _CPUWORKER_STATE_MIN);
|
|
tor_assert(conn->state <= _CPUWORKER_STATE_MAX);
|
|
break;
|
|
case CONN_TYPE_CONTROL:
|
|
tor_assert(conn->state >= _CONTROL_CONN_STATE_MIN);
|
|
tor_assert(conn->state <= _CONTROL_CONN_STATE_MAX);
|
|
break;
|
|
default:
|
|
tor_assert(0);
|
|
}
|
|
}
|
|
|