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r12080@catbus: nickm | 2007-03-04 21:40:55 -0500
Remove dnsworkers and related code. there goes another 550 lines of code. svn:r9736
This commit is contained in:
Nick Mathewson
parent
92f62b3684
commit
52713788b4
@ -11,6 +11,9 @@ Changes in version 0.2.0.1-alpha - 2007-??-??
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This has been deprecated since 0.1.1, and warnings have been issued
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since 0.1.2. When we encounter a v0 control message, we now send back
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an error and close the connection.
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- Remove the old "dns worker" server DNS code: it hasn't been default
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since 0.1.2.2-alpha, and all the servers seem to be using the new
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eventdns code.
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Changes in version 0.1.2.10-rc - 2007-03-??
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20
configure.in
20
configure.in
@ -19,18 +19,6 @@ AC_ARG_ENABLE(debug,
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CFLAGS="$CFLAGS -g"
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fi])
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AC_ARG_ENABLE(eventdns,
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AS_HELP_STRING(--enable-eventdns, enable asynchronous dns module),
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[case "${enableval}" in
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yes) eventdns=true ;;
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no) eventdns=false ;;
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*) AC_MSG_ERROR(bad value for --enable-eventdns) ;;
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esac], [eventdns=true])
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AM_CONDITIONAL(EVENTDNS, test x$eventdns = xtrue)
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if test x$eventdns = xtrue; then
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AC_DEFINE([USE_EVENTDNS], 1, "Define to 1 if we'll be using eventdns.c")
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fi
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AC_ARG_ENABLE(transparent,
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AS_HELP_STRING(--disable-transparent, disable transparent proxy support),
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[case "${enableval}" in
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@ -44,14 +32,6 @@ AC_ARG_ENABLE(threads,
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if test x$enable_threads = x; then
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case $host in
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*-*-netbsd* | *-*-openbsd* )
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# Don't try multithreading on netbsd -- there is no threadsafe DNS
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# lookup function there.
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if test x$eventdns != xtrue; then
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AC_MSG_NOTICE([You are running OpenBSD or NetBSD; I am assuming that
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getaddrinfo is not threadsafe here, so I will disable threads.])
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enable_threads="no"
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fi ;;
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*-*-solaris* )
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# Don't try multithreading on solaris -- cpuworkers seem to lock.
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AC_MSG_NOTICE([You are running Solaris; Sometimes threading makes
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@ -4,19 +4,13 @@ noinst_PROGRAMS = test
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bin_PROGRAMS = tor
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if EVENTDNS
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EVDNSSRC = eventdns.c
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else
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EVDNSSRC =
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endif
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tor_SOURCES = buffers.c circuitbuild.c circuitlist.c \
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circuituse.c command.c config.c \
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connection.c connection_edge.c connection_or.c control.c \
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cpuworker.c directory.c dirserv.c dns.c hibernate.c main.c \
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onion.c policies.c relay.c rendcommon.c rendclient.c rendmid.c \
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rendservice.c rephist.c router.c routerlist.c routerparse.c \
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$(EVDNSSRC) \
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eventdns.c \
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tor_main.c
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tor_LDADD = ../common/libor.a ../common/libor-crypto.a -lz -lssl -lcrypto
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@ -27,10 +21,10 @@ test_SOURCES = buffers.c circuitbuild.c circuitlist.c \
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cpuworker.c directory.c dirserv.c dns.c hibernate.c main.c \
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onion.c policies.c relay.c rendcommon.c rendclient.c rendmid.c \
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rendservice.c rephist.c router.c routerlist.c routerparse.c \
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$(EVDNSSRC) \
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eventdns.c \
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test.c
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test_LDADD = ../common/libor.a ../common/libor-crypto.a -lz -lssl -lcrypto
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noinst_HEADERS = or.h eventdns.h eventdns_tor.h eventdns.c
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noinst_HEADERS = or.h eventdns.h eventdns_tor.h
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@ -1001,13 +1001,10 @@ options_act(or_options_t *old_options)
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cpuworkers_rotate();
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if (dns_reset())
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return -1;
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}
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#ifdef USE_EVENTDNS
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else {
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} else {
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if (dns_reset())
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return -1;
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}
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#endif
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}
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/* Check if we need to parse and add the EntryNodes config option. */
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@ -2714,12 +2711,6 @@ options_validate(or_options_t *old_options, or_options_t *options,
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if (options->UseEntryGuards && ! options->NumEntryGuards)
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REJECT("Cannot enable UseEntryGuards with NumEntryGuards set to 0");
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#ifndef USE_EVENTDNS
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if (options->ServerDNSResolvConfFile)
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log(LOG_WARN, LD_CONFIG,
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"ServerDNSResolvConfFile only works when eventdns support is enabled.");
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#endif
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if (check_nickname_list(options->ExitNodes, "ExitNodes", msg))
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return -1;
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if (check_nickname_list(options->EntryNodes, "EntryNodes", msg))
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@ -51,7 +51,6 @@ conn_type_to_string(int type)
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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_DNSWORKER: return "DNS worker";
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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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@ -118,12 +117,6 @@ conn_state_to_string(int type, int state)
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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_DNSWORKER:
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switch (state) {
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case DNSWORKER_STATE_IDLE: return "idle";
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case DNSWORKER_STATE_BUSY: return "busy";
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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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@ -496,11 +489,6 @@ connection_about_to_close_connection(connection_t *conn)
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if (edge_conn->bridge_for_conn)
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connection_dirserv_unlink_from_bridge(edge_conn->bridge_for_conn);
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break;
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case CONN_TYPE_DNSWORKER:
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if (conn->state == DNSWORKER_STATE_BUSY) {
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dns_cancel_pending_resolve(conn->address);
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}
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break;
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}
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}
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@ -2242,8 +2230,6 @@ connection_process_inbuf(connection_t *conn, int package_partial)
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package_partial);
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case CONN_TYPE_DIR:
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return connection_dir_process_inbuf(TO_DIR_CONN(conn));
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case CONN_TYPE_DNSWORKER:
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return connection_dns_process_inbuf(conn);
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case CONN_TYPE_CPUWORKER:
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return connection_cpu_process_inbuf(conn);
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case CONN_TYPE_CONTROL:
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@ -2289,8 +2275,6 @@ connection_finished_flushing(connection_t *conn)
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return connection_edge_finished_flushing(TO_EDGE_CONN(conn));
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case CONN_TYPE_DIR:
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return connection_dir_finished_flushing(TO_DIR_CONN(conn));
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case CONN_TYPE_DNSWORKER:
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return connection_dns_finished_flushing(conn);
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case CONN_TYPE_CPUWORKER:
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return connection_cpu_finished_flushing(conn);
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case CONN_TYPE_CONTROL:
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@ -2339,8 +2323,6 @@ connection_reached_eof(connection_t *conn)
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return connection_edge_reached_eof(TO_EDGE_CONN(conn));
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case CONN_TYPE_DIR:
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return connection_dir_reached_eof(TO_DIR_CONN(conn));
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case CONN_TYPE_DNSWORKER:
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return connection_dns_reached_eof(conn);
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case CONN_TYPE_CPUWORKER:
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return connection_cpu_reached_eof(conn);
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case CONN_TYPE_CONTROL:
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@ -2513,10 +2495,6 @@ assert_connection_ok(connection_t *conn, time_t now)
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tor_assert(conn->purpose >= _DIR_PURPOSE_MIN);
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tor_assert(conn->purpose <= _DIR_PURPOSE_MAX);
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break;
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case CONN_TYPE_DNSWORKER:
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tor_assert(conn->state >= _DNSWORKER_STATE_MIN);
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tor_assert(conn->state <= _DNSWORKER_STATE_MAX);
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break;
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case CONN_TYPE_CPUWORKER:
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tor_assert(conn->state >= _CPUWORKER_STATE_MIN);
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tor_assert(conn->state <= _CPUWORKER_STATE_MAX);
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482
src/or/dns.c
482
src/or/dns.c
@ -8,32 +8,18 @@ const char dns_c_id[] =
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/**
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* \file dns.c
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* \brief Implements a local cache for DNS results for Tor servers.
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* We provide two asynchronous backend implementations:
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* 1) A farm of 'DNS worker' threads or processes to perform DNS lookups for
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* onion routers and cache the results.
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* 2) A wrapper around Adam Langley's eventdns.c code, to send requests
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* to the nameservers asynchronously.
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* This is implemetned as a wrapper around Adam Langley's eventdns.c code.
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* (We can't just use gethostbyname() and friends because we really need to
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* be nonblocking.)
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**/
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#include "or.h"
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#include "../common/ht.h"
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#ifdef USE_EVENTDNS
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#include "eventdns.h"
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#endif
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/** Longest hostname we're willing to resolve. */
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#define MAX_ADDRESSLEN 256
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/** Maximum DNS processes to spawn. */
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#define MAX_DNSWORKERS 100
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/** Minimum DNS processes to spawn. */
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#define MIN_DNSWORKERS 3
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/** If more than this many processes are idle, shut down the extras. */
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#define MAX_IDLE_DNSWORKERS 10
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/** How long will we wait for an answer from the resolver before we decide
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* that the resolver is wedged? */
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#define RESOLVE_MAX_TIMEOUT 300
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@ -44,14 +30,6 @@ const char dns_c_id[] =
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#define DNS_RESOLVE_FAILED_PERMANENT 2
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#define DNS_RESOLVE_SUCCEEDED 3
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#ifndef USE_EVENTDNS
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/** How many dnsworkers we have running right now. */
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static int num_dnsworkers=0;
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/** How many of the running dnsworkers have an assigned task right now. */
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static int num_dnsworkers_busy=0;
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/** When did we last rotate the dnsworkers? */
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static time_t last_rotation_time=0;
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#else
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/** Have we currently configured nameservers with eventdns? */
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static int nameservers_configured = 0;
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/** What was the resolv_conf fname we last used when configuring the
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@ -60,7 +38,6 @@ static char *resolv_conf_fname = NULL;
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/** What was the mtime on the resolv.conf file we last used when configuring
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* the nameservers? Used to check whether we need to reconfigure. */
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static time_t resolv_conf_mtime = 0;
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#endif
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/** Linked list of connections waiting for a DNS answer. */
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typedef struct pending_connection_t {
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@ -118,16 +95,9 @@ static void dns_found_answer(const char *address, int is_reverse,
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static void send_resolved_cell(edge_connection_t *conn, or_circuit_t *circ,
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uint8_t answer_type);
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static int launch_resolve(edge_connection_t *exitconn, or_circuit_t *circ);
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#ifndef USE_EVENTDNS
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static void dnsworkers_rotate(void);
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static void dnsworker_main(void *data);
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static int spawn_dnsworker(void);
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static int spawn_enough_dnsworkers(void);
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#else
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static void add_wildcarded_test_address(const char *address);
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static int configure_nameservers(int force);
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static int answer_is_wildcarded(const char *ip);
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#endif
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#ifdef DEBUG_DNS_CACHE
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static void _assert_cache_ok(void);
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#define assert_cache_ok() _assert_cache_ok()
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@ -168,7 +138,6 @@ init_cache_map(void)
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HT_INIT(cache_map, &cache_root);
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}
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#ifdef USE_EVENTDNS
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/** Helper: called by eventdns when eventdns wants to log something. */
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static void
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evdns_log_cb(int warn, const char *msg)
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@ -208,19 +177,14 @@ evdns_log_cb(int warn, const char *msg)
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}
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log(severity, LD_EXIT, "eventdns: %s", msg);
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}
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#endif
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/** Initialize the DNS subsystem; called by the OR process. */
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int
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dns_init(void)
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{
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init_cache_map();
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#ifdef USE_EVENTDNS
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if (server_mode(get_options()))
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return configure_nameservers(1);
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#else
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dnsworkers_rotate();
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#endif
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return 0;
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}
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@ -229,7 +193,6 @@ dns_init(void)
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int
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dns_reset(void)
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{
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#ifdef USE_EVENTDNS
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or_options_t *options = get_options();
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if (! server_mode(options)) {
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evdns_clear_nameservers_and_suspend();
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@ -241,9 +204,6 @@ dns_reset(void)
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if (configure_nameservers(0) < 0)
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return -1;
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}
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#else
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dnsworkers_rotate();
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#endif
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return 0;
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}
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@ -338,9 +298,7 @@ dns_free_all(void)
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if (cached_resolve_pqueue)
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smartlist_free(cached_resolve_pqueue);
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cached_resolve_pqueue = NULL;
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#ifdef USE_EVENTDNS
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tor_free(resolv_conf_fname);
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#endif
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}
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/** Remove every cached_resolve whose <b>expire</b> time is before <b>now</b>
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@ -635,7 +593,6 @@ dns_resolve(edge_connection_t *exitconn, or_circuit_t *oncirc)
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if (r == 1)
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is_reverse = 1;
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#ifdef USE_EVENTDNS
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if (!is_reverse || !is_resolve) {
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if (!is_reverse)
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log_info(LD_EXIT, "Bad .in-addr.arpa address \"%s\"; sending error.",
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@ -645,12 +602,6 @@ dns_resolve(edge_connection_t *exitconn, or_circuit_t *oncirc)
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"Attempt to connect to a .in-addr.arpa address \"%s\"; "
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"sending error.",
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escaped_safe_str(exitconn->_base.address));
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#else
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if (1) {
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log_info(LD_PROTOCOL, "Dnsworker code does not support in-addr.arpa "
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"domain, but received a request for \"%s\"; sending error.",
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escaped_safe_str(exitconn->_base.address));
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#endif
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if (exitconn->_base.purpose == EXIT_PURPOSE_RESOLVE)
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send_resolved_cell(exitconn, oncirc, RESOLVED_TYPE_ERROR);
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@ -1062,412 +1013,6 @@ dns_found_answer(const char *address, int is_reverse, uint32_t addr,
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assert_cache_ok();
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}
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#ifndef USE_EVENTDNS
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/** Find or spawn a dns worker process to handle resolving
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* <b>exitconn</b>-\>address; tell that dns worker to begin resolving.
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*/
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static int
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launch_resolve(edge_connection_t *exitconn, or_circuit_t *circ)
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{
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connection_t *dnsconn;
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unsigned char len;
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tor_assert(exitconn->_base.state == EXIT_CONN_STATE_RESOLVING);
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assert_connection_ok(TO_CONN(exitconn), 0);
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tor_assert(exitconn->_base.s == -1);
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/* respawn here, to be sure there are enough */
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if (spawn_enough_dnsworkers() < 0) {
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goto err;
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}
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dnsconn = connection_get_by_type_state(CONN_TYPE_DNSWORKER,
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DNSWORKER_STATE_IDLE);
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if (!dnsconn) {
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log_warn(LD_EXIT,"no idle dns workers. Failing.");
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if (exitconn->_base.purpose == EXIT_PURPOSE_RESOLVE)
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send_resolved_cell(exitconn, circ, RESOLVED_TYPE_ERROR_TRANSIENT);
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goto err;
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}
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log_debug(LD_EXIT,
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"Connection (fd %d) needs to resolve %s; assigning "
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"to DNSWorker (fd %d)", exitconn->_base.s,
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escaped_safe_str(exitconn->_base.address), dnsconn->s);
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tor_free(dnsconn->address);
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dnsconn->address = tor_strdup(exitconn->_base.address);
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dnsconn->state = DNSWORKER_STATE_BUSY;
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/* touch the lastwritten timestamp, since that's how we check to
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* see how long it's been since we asked the question, and sometimes
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* we check before the first call to connection_handle_write(). */
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dnsconn->timestamp_lastwritten = time(NULL);
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num_dnsworkers_busy++;
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len = strlen(dnsconn->address);
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connection_write_to_buf((char*)&len, 1, dnsconn);
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connection_write_to_buf(dnsconn->address, len, dnsconn);
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return 0;
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err:
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/* also sends end and frees */
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dns_cancel_pending_resolve(exitconn->_base.address);
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return -1;
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}
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/******************************************************************/
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/*
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* Connection between OR and dnsworker
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*/
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/** Write handler: called when we've pushed a request to a dnsworker. */
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int
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connection_dns_finished_flushing(connection_t *conn)
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{
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tor_assert(conn);
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tor_assert(conn->type == CONN_TYPE_DNSWORKER);
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connection_stop_writing(conn);
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return 0;
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}
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/** Called when a connection to a dnsworker hits an EOF; this only happens
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* when a dnsworker dies unexpectedly. */
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int
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connection_dns_reached_eof(connection_t *conn)
|
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{
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log_warn(LD_EXIT,"Read eof. DNS worker died unexpectedly.");
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if (conn->state == DNSWORKER_STATE_BUSY) {
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/* don't cancel the resolve here -- it would be cancelled in
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* connection_about_to_close_connection(), since conn is still
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* in state BUSY
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*/
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num_dnsworkers_busy--;
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}
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num_dnsworkers--;
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connection_mark_for_close(conn);
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return 0;
|
||||
}
|
||||
|
||||
/** Read handler: called when we get data from a dnsworker. See
|
||||
* if we have a complete answer. If so, call dns_found_answer on the
|
||||
* result. If not, wait. Returns 0. */
|
||||
int
|
||||
connection_dns_process_inbuf(connection_t *conn)
|
||||
{
|
||||
char success;
|
||||
uint32_t addr;
|
||||
int ttl;
|
||||
|
||||
tor_assert(conn);
|
||||
tor_assert(conn->type == CONN_TYPE_DNSWORKER);
|
||||
|
||||
if (conn->state != DNSWORKER_STATE_BUSY && buf_datalen(conn->inbuf)) {
|
||||
log_warn(LD_BUG,
|
||||
"read data (%d bytes) from an idle dns worker (fd %d, "
|
||||
"address %s). Please report.", (int)buf_datalen(conn->inbuf),
|
||||
conn->s, escaped_safe_str(conn->address));
|
||||
tor_fragile_assert();
|
||||
|
||||
/* Pull it off the buffer anyway, or it will just stay there.
|
||||
* Keep pulling things off because sometimes we get several
|
||||
* answers at once (!). */
|
||||
while (buf_datalen(conn->inbuf)) {
|
||||
connection_fetch_from_buf(&success,1,conn);
|
||||
connection_fetch_from_buf((char *)&addr,sizeof(uint32_t),conn);
|
||||
log_warn(LD_EXIT,"Discarding idle dns answer (success %d, addr %d.)",
|
||||
success, addr);
|
||||
}
|
||||
return 0;
|
||||
}
|
||||
if (buf_datalen(conn->inbuf) < 5) /* entire answer available? */
|
||||
return 0; /* not yet */
|
||||
tor_assert(conn->state == DNSWORKER_STATE_BUSY);
|
||||
tor_assert(buf_datalen(conn->inbuf) == 5);
|
||||
|
||||
connection_fetch_from_buf(&success,1,conn);
|
||||
connection_fetch_from_buf((char *)&addr,sizeof(uint32_t),conn);
|
||||
|
||||
log_debug(LD_EXIT, "DNSWorker (fd %d) returned answer for %s",
|
||||
conn->s, escaped_safe_str(conn->address));
|
||||
|
||||
tor_assert(success >= DNS_RESOLVE_FAILED_TRANSIENT);
|
||||
tor_assert(success <= DNS_RESOLVE_SUCCEEDED);
|
||||
|
||||
ttl = (success == DNS_RESOLVE_FAILED_TRANSIENT) ? 0 : MAX_DNS_ENTRY_AGE;
|
||||
dns_found_answer(conn->address, 0, ntohl(addr), NULL, success, ttl);
|
||||
|
||||
tor_free(conn->address);
|
||||
conn->address = tor_strdup("<idle>");
|
||||
conn->state = DNSWORKER_STATE_IDLE;
|
||||
num_dnsworkers_busy--;
|
||||
if (conn->timestamp_created < last_rotation_time) {
|
||||
connection_mark_for_close(conn);
|
||||
num_dnsworkers--;
|
||||
spawn_enough_dnsworkers();
|
||||
}
|
||||
return 0;
|
||||
}
|
||||
|
||||
/** Close and re-open all idle dnsworkers; schedule busy ones to be closed
|
||||
* and re-opened once they're no longer busy.
|
||||
**/
|
||||
static void
|
||||
dnsworkers_rotate(void)
|
||||
{
|
||||
connection_t *dnsconn;
|
||||
while ((dnsconn = connection_get_by_type_state(CONN_TYPE_DNSWORKER,
|
||||
DNSWORKER_STATE_IDLE))) {
|
||||
connection_mark_for_close(dnsconn);
|
||||
num_dnsworkers--;
|
||||
}
|
||||
last_rotation_time = time(NULL);
|
||||
if (server_mode(get_options()))
|
||||
spawn_enough_dnsworkers();
|
||||
}
|
||||
|
||||
/** Implementation for DNS workers; this code runs in a separate
|
||||
* execution context. It takes as its argument an fdarray as returned
|
||||
* by socketpair(), and communicates via fdarray[1]. The protocol is
|
||||
* as follows:
|
||||
* - The OR says:
|
||||
* - ADDRESSLEN [1 byte]
|
||||
* - ADDRESS [ADDRESSLEN bytes]
|
||||
* - The DNS worker does the lookup, and replies:
|
||||
* - OUTCOME [1 byte]
|
||||
* - IP [4 bytes]
|
||||
*
|
||||
* OUTCOME is one of DNS_RESOLVE_{FAILED_TRANSIENT|FAILED_PERMANENT|SUCCEEDED}.
|
||||
* IP is in host order.
|
||||
*
|
||||
* The dnsworker runs indefinitely, until its connection is closed or an error
|
||||
* occurs.
|
||||
*/
|
||||
static void
|
||||
dnsworker_main(void *data)
|
||||
{
|
||||
char address[MAX_ADDRESSLEN+1]; /* Plus a byte for a final '.' */
|
||||
unsigned char address_len;
|
||||
char *log_address;
|
||||
char answer[5];
|
||||
uint32_t ip;
|
||||
int *fdarray = data;
|
||||
int fd;
|
||||
int result;
|
||||
int search = get_options()->ServerDNSSearchDomains;
|
||||
|
||||
/* log_fn(LOG_NOTICE,"After spawn: fdarray @%d has %d:%d", (int)fdarray,
|
||||
* fdarray[0],fdarray[1]); */
|
||||
|
||||
fd = fdarray[1]; /* this side is ours */
|
||||
#ifndef TOR_IS_MULTITHREADED
|
||||
tor_close_socket(fdarray[0]); /* this is the side of the socketpair the
|
||||
* parent uses */
|
||||
tor_free_all(1); /* so the child doesn't hold the parent's fd's open */
|
||||
handle_signals(0); /* ignore interrupts from the keyboard, etc */
|
||||
#endif
|
||||
tor_free(data);
|
||||
|
||||
for (;;) {
|
||||
int r;
|
||||
|
||||
if ((r = recv(fd, &address_len, 1, 0)) != 1) {
|
||||
if (r == 0) {
|
||||
log_info(LD_EXIT,"DNS worker exiting because Tor process closed "
|
||||
"connection (either pruned idle dnsworker or died).");
|
||||
} else {
|
||||
log_info(LD_EXIT,"DNS worker exiting because of error on connection "
|
||||
"to Tor process.");
|
||||
log_info(LD_EXIT,"(Error on %d was %s)", fd,
|
||||
tor_socket_strerror(tor_socket_errno(fd)));
|
||||
}
|
||||
tor_close_socket(fd);
|
||||
crypto_thread_cleanup();
|
||||
spawn_exit();
|
||||
}
|
||||
|
||||
if (address_len && read_all(fd, address, address_len, 1) != address_len) {
|
||||
log_err(LD_BUG,"read hostname failed. Child exiting.");
|
||||
tor_close_socket(fd);
|
||||
crypto_thread_cleanup();
|
||||
spawn_exit();
|
||||
}
|
||||
/* Add a period to prevent local domain search, and NUL-terminate. */
|
||||
if (address[address_len-1] != '.' && !search) {
|
||||
address[address_len] = '.';
|
||||
address[address_len+1] = '\0';
|
||||
} else {
|
||||
address[address_len] = '\0';
|
||||
}
|
||||
|
||||
log_address = esc_for_log(safe_str(address));
|
||||
result = tor_lookup_hostname(address, &ip);
|
||||
/* Make 0.0.0.0 an error, so that we can use "0" to mean "no addr") */
|
||||
if (!ip)
|
||||
result = -1;
|
||||
switch (result) {
|
||||
case 1:
|
||||
/* XXX result can never be 1, because we set it to -1 above on error */
|
||||
log_info(LD_NET,"Could not resolve dest addr %s (transient)",
|
||||
log_address);
|
||||
answer[0] = DNS_RESOLVE_FAILED_TRANSIENT;
|
||||
break;
|
||||
case -1:
|
||||
log_info(LD_NET,"Could not resolve dest addr %s (permanent)",
|
||||
log_address);
|
||||
answer[0] = DNS_RESOLVE_FAILED_PERMANENT;
|
||||
break;
|
||||
case 0:
|
||||
log_info(LD_NET,"Resolved address %s", log_address);
|
||||
answer[0] = DNS_RESOLVE_SUCCEEDED;
|
||||
break;
|
||||
}
|
||||
tor_free(log_address);
|
||||
set_uint32(answer+1, ip);
|
||||
if (write_all(fd, answer, 5, 1) != 5) {
|
||||
log_err(LD_NET,"writing answer failed. Child exiting.");
|
||||
tor_close_socket(fd);
|
||||
crypto_thread_cleanup();
|
||||
spawn_exit();
|
||||
}
|
||||
}
|
||||
}
|
||||
|
||||
/** Launch a new DNS worker; return 0 on success, -1 on failure.
|
||||
*/
|
||||
static int
|
||||
spawn_dnsworker(void)
|
||||
{
|
||||
int *fdarray;
|
||||
int fd;
|
||||
connection_t *conn;
|
||||
int err;
|
||||
|
||||
fdarray = tor_malloc(sizeof(int)*2);
|
||||
if ((err = tor_socketpair(AF_UNIX, SOCK_STREAM, 0, fdarray)) < 0) {
|
||||
log_warn(LD_NET, "Couldn't construct socketpair for dns worker: %s",
|
||||
tor_socket_strerror(-err));
|
||||
tor_free(fdarray);
|
||||
return -1;
|
||||
}
|
||||
|
||||
tor_assert(fdarray[0] >= 0);
|
||||
tor_assert(fdarray[1] >= 0);
|
||||
|
||||
/* log_fn(LOG_NOTICE,"Before spawn: fdarray @%d has %d:%d",
|
||||
(int)fdarray, fdarray[0],fdarray[1]); */
|
||||
|
||||
fd = fdarray[0]; /* We copy this out here, since dnsworker_main may free
|
||||
* fdarray */
|
||||
spawn_func((void*) dnsworker_main, (void*)fdarray);
|
||||
log_debug(LD_EXIT,"just spawned a dns worker.");
|
||||
#ifndef TOR_IS_MULTITHREADED
|
||||
tor_close_socket(fdarray[1]); /* don't need the worker's side of the pipe */
|
||||
tor_free(fdarray);
|
||||
#endif
|
||||
|
||||
conn = connection_new(CONN_TYPE_DNSWORKER);
|
||||
|
||||
set_socket_nonblocking(fd);
|
||||
|
||||
/* set up conn so it's got all the data we need to remember */
|
||||
conn->s = fd;
|
||||
conn->address = tor_strdup("<unused>");
|
||||
|
||||
if (connection_add(conn) < 0) { /* no space, forget it */
|
||||
log_warn(LD_NET,"connection_add for dnsworker failed. Giving up.");
|
||||
connection_free(conn); /* this closes fd */
|
||||
return -1;
|
||||
}
|
||||
|
||||
conn->state = DNSWORKER_STATE_IDLE;
|
||||
connection_start_reading(conn);
|
||||
|
||||
return 0; /* success */
|
||||
}
|
||||
|
||||
/** If we have too many or too few DNS workers, spawn or kill some.
|
||||
* Return 0 if we are happy, return -1 if we tried to spawn more but
|
||||
* we couldn't.
|
||||
*/
|
||||
static int
|
||||
spawn_enough_dnsworkers(void)
|
||||
{
|
||||
int num_dnsworkers_needed; /* aim to have 1 more than needed,
|
||||
* but no less than min and no more than max */
|
||||
connection_t *dnsconn;
|
||||
|
||||
/* XXX This may not be the best strategy. Maybe we should queue pending
|
||||
* requests until the old ones finish or time out: otherwise, if the
|
||||
* connection requests come fast enough, we never get any DNS done. -NM
|
||||
*
|
||||
* XXX But if we queue them, then the adversary can pile even more
|
||||
* queries onto us, blocking legitimate requests for even longer. Maybe
|
||||
* we should compromise and only kill if it's been at it for more than,
|
||||
* e.g., 2 seconds. -RD
|
||||
*/
|
||||
if (num_dnsworkers_busy == MAX_DNSWORKERS) {
|
||||
/* We always want at least one worker idle.
|
||||
* So find the oldest busy worker and kill it.
|
||||
*/
|
||||
dnsconn = connection_get_by_type_state_lastwritten(CONN_TYPE_DNSWORKER,
|
||||
DNSWORKER_STATE_BUSY);
|
||||
tor_assert(dnsconn);
|
||||
|
||||
log_warn(LD_EXIT, "%d DNS workers are spawned; all are busy. Killing one.",
|
||||
MAX_DNSWORKERS);
|
||||
|
||||
connection_mark_for_close(dnsconn);
|
||||
num_dnsworkers_busy--;
|
||||
num_dnsworkers--;
|
||||
}
|
||||
|
||||
if (num_dnsworkers_busy >= MIN_DNSWORKERS)
|
||||
num_dnsworkers_needed = num_dnsworkers_busy+1;
|
||||
else
|
||||
num_dnsworkers_needed = MIN_DNSWORKERS;
|
||||
|
||||
while (num_dnsworkers < num_dnsworkers_needed) {
|
||||
if (spawn_dnsworker() < 0) {
|
||||
log_warn(LD_EXIT,"DNS worker spawn failed. Will try again later.");
|
||||
return -1;
|
||||
}
|
||||
num_dnsworkers++;
|
||||
}
|
||||
|
||||
while (num_dnsworkers > num_dnsworkers_busy+MAX_IDLE_DNSWORKERS) {
|
||||
/* too many idle? */
|
||||
/* cull excess workers */
|
||||
log_info(LD_EXIT,"%d of %d dnsworkers are idle. Killing one.",
|
||||
num_dnsworkers-num_dnsworkers_busy, num_dnsworkers);
|
||||
dnsconn = connection_get_by_type_state(CONN_TYPE_DNSWORKER,
|
||||
DNSWORKER_STATE_IDLE);
|
||||
tor_assert(dnsconn);
|
||||
connection_mark_for_close(dnsconn);
|
||||
num_dnsworkers--;
|
||||
}
|
||||
|
||||
return 0;
|
||||
}
|
||||
|
||||
void
|
||||
dns_launch_correctness_checks(void)
|
||||
{
|
||||
}
|
||||
|
||||
int
|
||||
dns_seems_to_be_broken(void)
|
||||
{
|
||||
return 0;
|
||||
}
|
||||
|
||||
void
|
||||
dns_reset_correctness_checks(void)
|
||||
{
|
||||
}
|
||||
#else /* !USE_EVENTDNS */
|
||||
|
||||
/** Eventdns helper: return true iff the eventdns result <b>err</b> is
|
||||
* a transient failure. */
|
||||
static int
|
||||
@ -1483,30 +1028,6 @@ evdns_err_is_transient(int err)
|
||||
return 0;
|
||||
}
|
||||
}
|
||||
/* Dummy function; never called with eventdns enabled. */
|
||||
int
|
||||
connection_dns_finished_flushing(connection_t *conn)
|
||||
{
|
||||
(void)conn;
|
||||
tor_assert(0);
|
||||
return 0;
|
||||
}
|
||||
/* Dummy function; never called with eventdns enabled. */
|
||||
int
|
||||
connection_dns_process_inbuf(connection_t *conn)
|
||||
{
|
||||
(void)conn;
|
||||
tor_assert(0);
|
||||
return 0;
|
||||
}
|
||||
/* Dummy function; never called with eventdns enabled. */
|
||||
int
|
||||
connection_dns_reached_eof(connection_t *conn)
|
||||
{
|
||||
(void)conn;
|
||||
tor_assert(0);
|
||||
return 0;
|
||||
}
|
||||
|
||||
/** Configure eventdns nameservers if force is true, or if the configuration
|
||||
* has changed since the last time we called this function. On Unix, this
|
||||
@ -1978,7 +1499,6 @@ answer_is_wildcarded(const char *ip)
|
||||
{
|
||||
return dns_wildcard_list && smartlist_string_isin(dns_wildcard_list, ip);
|
||||
}
|
||||
#endif /* USE_EVENTDNS */
|
||||
|
||||
/** Exit with an assertion if <b>resolve</b> is corrupt. */
|
||||
static void
|
||||
|
||||
@ -16,9 +16,8 @@ const char main_c_id[] =
|
||||
#ifdef USE_DMALLOC
|
||||
#include <dmalloc.h>
|
||||
#endif
|
||||
#ifdef USE_EVENTDNS
|
||||
|
||||
void evdns_shutdown(int);
|
||||
#endif
|
||||
|
||||
/********* PROTOTYPES **********/
|
||||
|
||||
@ -1640,11 +1639,9 @@ tor_init(int argc, char *argv[])
|
||||
void
|
||||
tor_free_all(int postfork)
|
||||
{
|
||||
#ifdef USE_EVENTDNS
|
||||
if (!postfork) {
|
||||
evdns_shutdown(1);
|
||||
}
|
||||
#endif
|
||||
routerlist_free_all();
|
||||
addressmap_free_all();
|
||||
set_exit_redirects(NULL); /* free the registered exit redirects */
|
||||
|
||||
17
src/or/or.h
17
src/or/or.h
@ -229,21 +229,19 @@ typedef enum {
|
||||
#define CONN_TYPE_DIR_LISTENER 8
|
||||
/** Type for HTTP connections to the directory server. */
|
||||
#define CONN_TYPE_DIR 9
|
||||
/** Connection from the main process to a DNS worker process. */
|
||||
#define CONN_TYPE_DNSWORKER 10
|
||||
/** Connection from the main process to a CPU worker process. */
|
||||
#define CONN_TYPE_CPUWORKER 11
|
||||
#define CONN_TYPE_CPUWORKER 10
|
||||
/** Type for listening for connections from user interface process. */
|
||||
#define CONN_TYPE_CONTROL_LISTENER 12
|
||||
#define CONN_TYPE_CONTROL_LISTENER 11
|
||||
/** Type for connections from user interface process. */
|
||||
#define CONN_TYPE_CONTROL 13
|
||||
#define CONN_TYPE_CONTROL 12
|
||||
/** Type for sockets listening for transparent connections redirected by pf or
|
||||
* netfilter. */
|
||||
#define CONN_TYPE_AP_TRANS_LISTENER 14
|
||||
#define CONN_TYPE_AP_TRANS_LISTENER 13
|
||||
/** Type for sockets listening for transparent connections redirected by
|
||||
* natd. */
|
||||
#define CONN_TYPE_AP_NATD_LISTENER 15
|
||||
#define _CONN_TYPE_MAX 15
|
||||
#define CONN_TYPE_AP_NATD_LISTENER 14
|
||||
#define _CONN_TYPE_MAX 14
|
||||
|
||||
#define CONN_IS_EDGE(x) \
|
||||
((x)->type == CONN_TYPE_EXIT || (x)->type == CONN_TYPE_AP)
|
||||
@ -2473,9 +2471,6 @@ void cached_dir_decref(cached_dir_t *d);
|
||||
int dns_init(void);
|
||||
void dns_free_all(void);
|
||||
uint32_t dns_clip_ttl(uint32_t ttl);
|
||||
int connection_dns_finished_flushing(connection_t *conn);
|
||||
int connection_dns_reached_eof(connection_t *conn);
|
||||
int connection_dns_process_inbuf(connection_t *conn);
|
||||
int dns_reset(void);
|
||||
void connection_dns_remove(edge_connection_t *conn);
|
||||
void assert_connection_edge_not_dns_pending(edge_connection_t *conn);
|
||||
|
||||
@ -1224,9 +1224,6 @@ router_dump_router_to_string(char *s, size_t maxlen, routerinfo_t *router,
|
||||
"bandwidth %d %d %d\n"
|
||||
"onion-key\n%s"
|
||||
"signing-key\n%s"
|
||||
#ifndef USE_EVENTDNS
|
||||
"opt eventdns 0\n"
|
||||
#endif
|
||||
"%s%s%s",
|
||||
router->nickname,
|
||||
router->address,
|
||||
|
||||
@ -1557,9 +1557,6 @@ test_dir_format(void)
|
||||
strlcat(buf2, pk1_str, sizeof(buf2));
|
||||
strlcat(buf2, "signing-key\n", sizeof(buf2));
|
||||
strlcat(buf2, pk2_str, sizeof(buf2));
|
||||
#ifndef USE_EVENTDNS
|
||||
strlcat(buf2, "opt eventdns 0\n", sizeof(buf2));
|
||||
#endif
|
||||
strlcat(buf2, bw_lines, sizeof(buf2));
|
||||
strlcat(buf2, "router-signature\n", sizeof(buf2));
|
||||
buf[strlen(buf2)] = '\0'; /* Don't compare the sig; it's never the same
|
||||
|
||||
Loading…
Reference in New Issue
Block a user