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https://gitlab.torproject.org/tpo/core/tor.git
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client now retries when streams end early for 'hibernating' or
'resource limit' reasons; refactor. svn:r4004
This commit is contained in:
Roger Dingledine
parent
f89ef9793e
commit
f1edeebf7d
232
src/or/relay.c
232
src/or/relay.c
@ -457,17 +457,16 @@ int connection_edge_send_command(connection_t *fromconn, circuit_t *circ,
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return 0;
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}
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/** Translate the <b>payload</b> of length <b>length</b>, which
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* came from a relay 'end' cell, into a static const string describing
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* why the stream is closing.
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/** Translate <b>reason</b>, which came from a relay 'end' cell,
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* into a static const string describing why the stream is closing.
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* <b>reason</b> is -1 if no reason was provided.
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*/
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static const char *
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connection_edge_end_reason_str(char *payload, uint16_t length) {
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if (length < 1) {
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log_fn(LOG_WARN,"End cell arrived with length 0. Should be at least 1.");
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return "MALFORMED";
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}
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switch (*payload) {
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connection_edge_end_reason_str(int reason) {
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switch (reason) {
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case -1:
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log_fn(LOG_WARN,"End cell arrived with length 0. Should be at least 1.");
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return "MALFORMED";
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case END_STREAM_REASON_MISC: return "misc error";
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case END_STREAM_REASON_RESOLVEFAILED: return "resolve failed";
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case END_STREAM_REASON_CONNECTREFUSED: return "connection refused";
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@ -481,7 +480,7 @@ connection_edge_end_reason_str(char *payload, uint16_t length) {
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case END_STREAM_REASON_CONNRESET: return "connection reset";
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case END_STREAM_REASON_TORPROTOCOL: return "Tor protocol error";
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default:
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log_fn(LOG_WARN,"Reason for ending (%d) not recognized.",*payload);
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log_fn(LOG_WARN,"Reason for ending (%d) not recognized.",reason);
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return "unknown";
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}
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}
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@ -583,6 +582,107 @@ errno_to_end_reason(int e)
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*/
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#define MAX_RESOLVE_FAILURES 3
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/** Return 1 if reason is something that you should retry if you
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* get the end cell before you've connected; else return 0. */
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static int
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edge_reason_is_retriable(int reason) {
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return reason == END_STREAM_REASON_HIBERNATING ||
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reason == END_STREAM_REASON_RESOURCELIMIT ||
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reason == END_STREAM_REASON_EXITPOLICY ||
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reason == END_STREAM_REASON_RESOLVEFAILED;
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}
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static int
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connection_edge_process_end_not_open(
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relay_header_t *rh, cell_t *cell, circuit_t *circ,
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connection_t *conn, crypt_path_t *layer_hint) {
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struct in_addr in;
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routerinfo_t *exitrouter;
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int reason = *(cell->payload+RELAY_HEADER_SIZE);
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if (rh->length > 0 && edge_reason_is_retriable(reason)) {
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if (conn->type != CONN_TYPE_AP) {
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log_fn(LOG_WARN,"Got an end because of %s, but we're not an AP. Closing.",
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connection_edge_end_reason_str(reason));
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return -1;
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}
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log_fn(LOG_INFO,"Address '%s' refused due to '%s'. Considering retrying.",
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conn->socks_request->address,
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connection_edge_end_reason_str(reason));
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exitrouter = router_get_by_digest(circ->build_state->chosen_exit_digest);
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if (!exitrouter) {
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log_fn(LOG_INFO,"Skipping broken circ (exit router vanished)");
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return 0; /* this circuit is screwed and doesn't know it yet */
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}
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switch (reason) {
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case END_STREAM_REASON_EXITPOLICY:
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if (rh->length >= 5) {
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uint32_t addr = ntohl(get_uint32(cell->payload+RELAY_HEADER_SIZE+1));
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if (!addr) {
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log_fn(LOG_INFO,"Address '%s' resolved to 0.0.0.0. Closing,",
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conn->socks_request->address);
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connection_mark_unattached_ap(conn, END_STREAM_REASON_TORPROTOCOL);
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return 0;
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}
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client_dns_set_addressmap(conn->socks_request->address, addr,
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conn->chosen_exit_name);
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}
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/* check if he *ought* to have allowed it */
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if (rh->length < 5 ||
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(!tor_inet_aton(conn->socks_request->address, &in) &&
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!conn->chosen_exit_name)) {
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log_fn(LOG_NOTICE,"Exitrouter '%s' seems to be more restrictive than its exit policy. Not using this router as exit for now.", exitrouter->nickname);
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addr_policy_free(exitrouter->exit_policy);
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exitrouter->exit_policy =
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router_parse_addr_policy_from_string("reject *:*");
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}
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if (connection_ap_detach_retriable(conn, circ) >= 0)
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return 0;
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/* else, conn will get closed below */
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break;
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case END_STREAM_REASON_RESOLVEFAILED:
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if (client_dns_incr_failures(conn->socks_request->address)
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< MAX_RESOLVE_FAILURES) {
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/* We haven't retried too many times; reattach the connection. */
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circuit_log_path(LOG_INFO,circ);
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tor_assert(circ->timestamp_dirty);
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circ->timestamp_dirty -= get_options()->MaxCircuitDirtiness;
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if (connection_ap_detach_retriable(conn, circ) >= 0)
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return 0;
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/* else, conn will get closed below */
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} else {
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log_fn(LOG_NOTICE,"Have tried resolving address '%s' at %d different places. Giving up.",
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conn->socks_request->address, MAX_RESOLVE_FAILURES);
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}
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break;
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case END_STREAM_REASON_HIBERNATING:
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case END_STREAM_REASON_RESOURCELIMIT:
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addr_policy_free(exitrouter->exit_policy);
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exitrouter->exit_policy =
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router_parse_addr_policy_from_string("reject *:*");
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if (connection_ap_detach_retriable(conn, circ) >= 0)
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return 0;
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/* else, will close below */
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break;
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} /* end switch */
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log_fn(LOG_INFO,"Giving up on retrying; conn can't be handled.");
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}
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log_fn(LOG_INFO,"Edge got end (%s) before we're connected. Marking for close.",
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connection_edge_end_reason_str(rh->length > 0 ? reason : -1));
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if (conn->type == CONN_TYPE_AP) {
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circuit_log_path(LOG_INFO,circ);
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connection_mark_unattached_ap(conn, reason);
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} else {
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conn->has_sent_end = 1; /* we just got an 'end', don't need to send one */
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connection_mark_for_close(conn);
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}
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return 0;
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}
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/** An incoming relay cell has arrived from circuit <b>circ</b> to
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* stream <b>conn</b>.
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*
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@ -594,89 +694,9 @@ static int
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connection_edge_process_relay_cell_not_open(
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relay_header_t *rh, cell_t *cell, circuit_t *circ,
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connection_t *conn, crypt_path_t *layer_hint) {
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struct in_addr in;
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uint32_t addr;
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int reason;
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routerinfo_t *exitrouter;
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if (rh->command == RELAY_COMMAND_END) {
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reason = *(cell->payload+RELAY_HEADER_SIZE);
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/* We have to check this here, since we aren't connected yet. */
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if (rh->length >= 5 && reason == END_STREAM_REASON_EXITPOLICY) {
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if (conn->type != CONN_TYPE_AP) {
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log_fn(LOG_WARN,"Got an end because of exitpolicy, but we're not an AP. Closing.");
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return -1;
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}
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addr = ntohl(get_uint32(cell->payload+RELAY_HEADER_SIZE+1));
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if (addr) {
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log_fn(LOG_INFO,"Address '%s' refused due to exit policy. Retrying.",
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conn->socks_request->address);
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} else {
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log_fn(LOG_INFO,"Address '%s' resolved to 0.0.0.0. Closing,",
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conn->socks_request->address);
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connection_mark_unattached_ap(conn, END_STREAM_REASON_TORPROTOCOL);
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return 0;
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}
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client_dns_set_addressmap(conn->socks_request->address, addr,
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conn->chosen_exit_name);
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/* check if he *ought* to have allowed it */
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exitrouter = router_get_by_digest(circ->build_state->chosen_exit_digest);
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if (!exitrouter) {
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log_fn(LOG_INFO,"Skipping broken circ (exit router vanished)");
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return 0; /* this circuit is screwed and doesn't know it yet */
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}
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if (!tor_inet_aton(conn->socks_request->address, &in) &&
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!conn->chosen_exit_name) {
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log_fn(LOG_NOTICE,"Exitrouter '%s' seems to be more restrictive than its exit policy. Not using this router as exit for now.", exitrouter->nickname);
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addr_policy_free(exitrouter->exit_policy);
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exitrouter->exit_policy =
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router_parse_addr_policy_from_string("reject *:*");
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}
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if (connection_ap_detach_retriable(conn, circ) >= 0)
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return 0;
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log_fn(LOG_INFO,"Giving up on retrying (from exitpolicy); conn can't be handled.");
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/* else, conn will get closed below */
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} else if (rh->length && reason == END_STREAM_REASON_RESOLVEFAILED) {
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if (conn->type != CONN_TYPE_AP) {
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log_fn(LOG_WARN,"Got an end because of resolvefailed, but we're not an AP. Closing.");
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return -1;
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}
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if (client_dns_incr_failures(conn->socks_request->address)
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< MAX_RESOLVE_FAILURES) {
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/* We haven't retried too many times; reattach the connection. */
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log_fn(LOG_INFO,"Resolve of '%s' failed, trying again.",
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conn->socks_request->address);
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circuit_log_path(LOG_INFO,circ);
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tor_assert(circ->timestamp_dirty);
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circ->timestamp_dirty -= get_options()->MaxCircuitDirtiness;
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if (connection_ap_detach_retriable(conn, circ) >= 0)
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return 0;
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/* else, conn will get closed below */
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log_fn(LOG_INFO,"Giving up on retrying (from resolvefailed); conn can't be handled.");
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} else {
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log_fn(LOG_NOTICE,"Have tried resolving address '%s' at %d different places. Giving up.",
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conn->socks_request->address, MAX_RESOLVE_FAILURES);
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}
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}
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log_fn(LOG_INFO,"Edge got end (%s) before we're connected. Marking for close.",
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connection_edge_end_reason_str(cell->payload+RELAY_HEADER_SIZE,
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rh->length));
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if (CIRCUIT_IS_ORIGIN(circ))
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circuit_log_path(LOG_INFO,circ);
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if (conn->type == CONN_TYPE_AP) {
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connection_mark_unattached_ap(conn,
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*(char *)(cell->payload+RELAY_HEADER_SIZE));
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} else {
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conn->has_sent_end = 1; /* we just got an 'end', don't need to send one */
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connection_mark_for_close(conn);
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}
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return 0;
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}
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if (rh->command == RELAY_COMMAND_END)
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return connection_edge_process_end_not_open(rh, cell, circ, conn, layer_hint);
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if (conn->type == CONN_TYPE_AP && rh->command == RELAY_COMMAND_CONNECTED) {
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if (conn->state != AP_CONN_STATE_CONNECT_WAIT) {
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@ -688,7 +708,7 @@ connection_edge_process_relay_cell_not_open(
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log_fn(LOG_INFO,"'connected' received after %d seconds.",
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(int)(time(NULL) - conn->timestamp_lastread));
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if (rh->length >= 4) {
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addr = ntohl(get_uint32(cell->payload+RELAY_HEADER_SIZE));
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uint32_t addr = ntohl(get_uint32(cell->payload+RELAY_HEADER_SIZE));
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if (!addr) {
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log_fn(LOG_INFO,"...but it claims the IP address was 0.0.0.0. Closing.");
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connection_edge_end(conn, END_STREAM_REASON_TORPROTOCOL, conn->cpath_layer);
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@ -762,12 +782,9 @@ connection_edge_process_relay_cell(cell_t *cell, circuit_t *circ,
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/* either conn is NULL, in which case we've got a control cell, or else
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* conn points to the recognized stream. */
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if (conn &&
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conn->state != AP_CONN_STATE_OPEN &&
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conn->state != EXIT_CONN_STATE_OPEN) {
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if (conn && !connection_state_is_open(conn))
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return connection_edge_process_relay_cell_not_open(
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&rh, cell, circ, conn, layer_hint);
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}
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switch (rh.command) {
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case RELAY_COMMAND_DROP:
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@ -821,27 +838,18 @@ connection_edge_process_relay_cell(cell_t *cell, circuit_t *circ,
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case RELAY_COMMAND_END:
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if (!conn) {
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log_fn(LOG_INFO,"end cell (%s) dropped, unknown stream.",
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connection_edge_end_reason_str(cell->payload+RELAY_HEADER_SIZE,
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rh.length));
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connection_edge_end_reason_str(rh.length > 0 ?
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*(char *)(cell->payload+RELAY_HEADER_SIZE) : -1));
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return 0;
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}
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/* XXX add to this log_fn the exit node's nickname? */
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log_fn(LOG_INFO,"%d: end cell (%s) for stream %d. Removing stream. Size %d.",
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conn->s,
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connection_edge_end_reason_str(cell->payload+RELAY_HEADER_SIZE,
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rh.length),
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connection_edge_end_reason_str(rh.length > 0 ?
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*(char *)(cell->payload+RELAY_HEADER_SIZE) : -1),
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conn->stream_id, (int)conn->stream_size);
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if (conn->socks_request && !conn->socks_request->has_finished) {
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socks5_reply_status_t status;
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if (rh.length < 1) {
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log_fn(LOG_WARN,"End cell arrived with length 0. Should be at least 1.");
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status = SOCKS5_GENERAL_ERROR;
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} else {
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status = connection_edge_end_reason_socks5_response(
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*(uint8_t*)cell->payload+RELAY_HEADER_SIZE);
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}
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connection_ap_handshake_socks_reply(conn, NULL, 0, status);
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}
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if (conn->socks_request && !conn->socks_request->has_finished)
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log_fn(LOG_WARN,"Bug: open stream hasn't sent socks answer yet? Closing.");
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#ifdef HALF_OPEN
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conn->done_sending = 1;
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shutdown(conn->s, 1); /* XXX check return; refactor NM */
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