[tor-commits] [tor/master] relay: New file relay_resolve_addr.{c|h}
nickm at torproject.org
nickm at torproject.org
Thu May 7 12:31:37 UTC 2020
commit 445df9e7b5bbb0ea080bbed25dc4f3b52b0eb7df
Author: David Goulet <dgoulet at torproject.org>
Date: Tue May 5 13:24:03 2020 -0400
relay: New file relay_resolve_addr.{c|h}
This commit moves router_pick_published_address() and the related helper
functions into the new file.
The log_addr_has_changed() function has been made public in router.h so we can
use it in relay_resolve_addr.c.
This is a refactoring as part of Sponsor 55. Only code movement at this
commit.
Part of #33789
Signed-off-by: David Goulet <dgoulet at torproject.org>
---
src/feature/client/transports.c | 1 +
src/feature/control/control_getinfo.c | 1 +
src/feature/dirclient/dirclient.c | 1 +
src/feature/dirclient/dirclient_modes.c | 1 +
src/feature/relay/include.am | 2 +
src/feature/relay/relay_resolve_addr.c | 132 ++++++++++++++++++++++++++++++++
src/feature/relay/relay_resolve_addr.h | 23 ++++++
src/feature/relay/router.c | 118 +---------------------------
src/feature/relay/router.h | 8 +-
src/test/test_config.c | 1 +
10 files changed, 167 insertions(+), 121 deletions(-)
diff --git a/src/feature/client/transports.c b/src/feature/client/transports.c
index 55069bb60..b2a39c678 100644
--- a/src/feature/client/transports.c
+++ b/src/feature/client/transports.c
@@ -97,6 +97,7 @@
#include "core/or/circuitbuild.h"
#include "feature/client/transports.h"
#include "feature/relay/router.h"
+#include "feature/relay/relay_resolve_addr.h"
/* 31851: split the server transport code out of the client module */
#include "feature/relay/transport_config.h"
#include "app/config/statefile.h"
diff --git a/src/feature/control/control_getinfo.c b/src/feature/control/control_getinfo.c
index 5dcc4b170..673920c9b 100644
--- a/src/feature/control/control_getinfo.c
+++ b/src/feature/control/control_getinfo.c
@@ -44,6 +44,7 @@
#include "feature/nodelist/nodelist.h"
#include "feature/nodelist/routerinfo.h"
#include "feature/nodelist/routerlist.h"
+#include "feature/relay/relay_resolve_addr.h"
#include "feature/relay/router.h"
#include "feature/relay/routermode.h"
#include "feature/relay/selftest.h"
diff --git a/src/feature/dirclient/dirclient.c b/src/feature/dirclient/dirclient.c
index 2072dddad..c80a6606a 100644
--- a/src/feature/dirclient/dirclient.c
+++ b/src/feature/dirclient/dirclient.c
@@ -44,6 +44,7 @@
#include "feature/nodelist/routerinfo.h"
#include "feature/nodelist/routerlist.h"
#include "feature/nodelist/routerset.h"
+#include "feature/relay/relay_resolve_addr.h"
#include "feature/relay/routermode.h"
#include "feature/relay/selftest.h"
#include "feature/rend/rendcache.h"
diff --git a/src/feature/dirclient/dirclient_modes.c b/src/feature/dirclient/dirclient_modes.c
index 23fd1a2f6..b385a6e86 100644
--- a/src/feature/dirclient/dirclient_modes.c
+++ b/src/feature/dirclient/dirclient_modes.c
@@ -16,6 +16,7 @@
#include "feature/dirclient/dirclient_modes.h"
#include "feature/dircache/dirserv.h"
+#include "feature/relay/relay_resolve_addr.h"
#include "feature/relay/router.h"
#include "feature/relay/routermode.h"
#include "feature/stats/predict_ports.h"
diff --git a/src/feature/relay/include.am b/src/feature/relay/include.am
index 654432c34..2aa298560 100644
--- a/src/feature/relay/include.am
+++ b/src/feature/relay/include.am
@@ -2,6 +2,7 @@
# Legacy shared relay code: migrate to the relay module over time
LIBTOR_APP_A_SOURCES += \
src/feature/relay/onion_queue.c \
+ src/feature/relay/relay_resolve_addr.c \
src/feature/relay/router.c
# The Relay module.
@@ -31,6 +32,7 @@ noinst_HEADERS += \
src/feature/relay/relay_handshake.h \
src/feature/relay/relay_periodic.h \
src/feature/relay/relay_sys.h \
+ src/feature/relay/relay_resolve_addr.h \
src/feature/relay/router.h \
src/feature/relay/routerkeys.h \
src/feature/relay/routermode.h \
diff --git a/src/feature/relay/relay_resolve_addr.c b/src/feature/relay/relay_resolve_addr.c
new file mode 100644
index 000000000..7d83d870c
--- /dev/null
+++ b/src/feature/relay/relay_resolve_addr.c
@@ -0,0 +1,132 @@
+/* Copyright (c) 2001-2020, The Tor Project, Inc. */
+/* See LICENSE for licensing information */
+
+/**
+ * \file relay_resolve_addr.c
+ * \brief Implement relay resolving address mechanism.
+ **/
+
+#include "core/or/or.h"
+
+#include "app/config/config.h"
+
+#include "core/mainloop/mainloop.h"
+
+#include "feature/control/control_events.h"
+#include "feature/dircommon/dir_connection_st.h"
+#include "feature/relay/relay_resolve_addr.h"
+#include "feature/relay/router.h"
+#include "feature/relay/routermode.h"
+
+/** The most recently guessed value of our IP address, based on directory
+ * headers. */
+static tor_addr_t last_guessed_ip = TOR_ADDR_NULL;
+
+/** We failed to resolve our address locally, but we'd like to build
+ * a descriptor and publish / test reachability. If we have a guess
+ * about our address based on directory headers, answer it and return
+ * 0; else return -1. */
+static int
+router_guess_address_from_dir_headers(uint32_t *guess)
+{
+ if (!tor_addr_is_null(&last_guessed_ip)) {
+ *guess = tor_addr_to_ipv4h(&last_guessed_ip);
+ return 0;
+ }
+ return -1;
+}
+
+/** A directory server <b>d_conn</b> told us our IP address is
+ * <b>suggestion</b>.
+ * If this address is different from the one we think we are now, and
+ * if our computer doesn't actually know its IP address, then switch. */
+void
+router_new_address_suggestion(const char *suggestion,
+ const dir_connection_t *d_conn)
+{
+ tor_addr_t addr;
+ uint32_t cur = 0; /* Current IPv4 address. */
+ const or_options_t *options = get_options();
+
+ /* first, learn what the IP address actually is */
+ if (tor_addr_parse(&addr, suggestion) == -1) {
+ log_debug(LD_DIR, "Malformed X-Your-Address-Is header %s. Ignoring.",
+ escaped(suggestion));
+ return;
+ }
+
+ log_debug(LD_DIR, "Got X-Your-Address-Is: %s.", suggestion);
+
+ if (!server_mode(options)) {
+ tor_addr_copy(&last_guessed_ip, &addr);
+ return;
+ }
+
+ /* XXXX ipv6 */
+ cur = get_last_resolved_addr();
+ if (cur ||
+ resolve_my_address(LOG_INFO, options, &cur, NULL, NULL) >= 0) {
+ /* We're all set -- we already know our address. Great. */
+ tor_addr_from_ipv4h(&last_guessed_ip, cur); /* store it in case we
+ need it later */
+ return;
+ }
+ if (tor_addr_is_internal(&addr, 0)) {
+ /* Don't believe anybody who says our IP is, say, 127.0.0.1. */
+ return;
+ }
+ if (tor_addr_eq(&d_conn->base_.addr, &addr)) {
+ /* Don't believe anybody who says our IP is their IP. */
+ log_debug(LD_DIR, "A directory server told us our IP address is %s, "
+ "but they are just reporting their own IP address. Ignoring.",
+ suggestion);
+ return;
+ }
+
+ /* Okay. We can't resolve our own address, and X-Your-Address-Is is giving
+ * us an answer different from what we had the last time we managed to
+ * resolve it. */
+ if (!tor_addr_eq(&last_guessed_ip, &addr)) {
+ control_event_server_status(LOG_NOTICE,
+ "EXTERNAL_ADDRESS ADDRESS=%s METHOD=DIRSERV",
+ suggestion);
+ log_addr_has_changed(LOG_NOTICE, &last_guessed_ip, &addr,
+ d_conn->base_.address);
+ ip_address_changed(0);
+ tor_addr_copy(&last_guessed_ip, &addr); /* router_rebuild_descriptor()
+ will fetch it */
+ }
+}
+
+/** Make a current best guess at our address, either because
+ * it's configured in torrc, or because we've learned it from
+ * dirserver headers. Place the answer in *<b>addr</b> and return
+ * 0 on success, else return -1 if we have no guess.
+ *
+ * If <b>cache_only</b> is true, just return any cached answers, and
+ * don't try to get any new answers.
+ */
+MOCK_IMPL(int,
+router_pick_published_address, (const or_options_t *options, uint32_t *addr,
+ int cache_only))
+{
+ /* First, check the cached output from resolve_my_address(). */
+ *addr = get_last_resolved_addr();
+ if (*addr)
+ return 0;
+
+ /* Second, consider doing a resolve attempt right here. */
+ if (!cache_only) {
+ if (resolve_my_address(LOG_INFO, options, addr, NULL, NULL) >= 0) {
+ log_info(LD_CONFIG,"Success: chose address '%s'.", fmt_addr32(*addr));
+ return 0;
+ }
+ }
+
+ /* Third, check the cached output from router_new_address_suggestion(). */
+ if (router_guess_address_from_dir_headers(addr) >= 0)
+ return 0;
+
+ /* We have no useful cached answers. Return failure. */
+ return -1;
+}
diff --git a/src/feature/relay/relay_resolve_addr.h b/src/feature/relay/relay_resolve_addr.h
new file mode 100644
index 000000000..1ead2baf7
--- /dev/null
+++ b/src/feature/relay/relay_resolve_addr.h
@@ -0,0 +1,23 @@
+/* Copyright (c) 2020, The Tor Project, Inc. */
+/* See LICENSE for licensing information */
+
+/**
+ * \file relay_resolve_addr.h
+ * \brief Header file for relay_resolve_addr.c.
+ **/
+
+#ifndef TOR_RELAY_RESOLVE_ADDR_H
+#define TOR_RELAY_RESOLVE_ADDR_H
+
+MOCK_DECL(int, router_pick_published_address,
+ (const or_options_t *options, uint32_t *addr, int cache_only));
+
+void router_new_address_suggestion(const char *suggestion,
+ const dir_connection_t *d_conn);
+
+#ifdef RELAY_RESOLVE_ADDR_PRIVATE
+
+#endif /* RELAY_RESOLVE_ADDR_PRIVATE */
+
+#endif /* TOR_RELAY_RESOLVE_ADDR_H */
+
diff --git a/src/feature/relay/router.c b/src/feature/relay/router.c
index 2858371af..cbb49ede1 100644
--- a/src/feature/relay/router.c
+++ b/src/feature/relay/router.c
@@ -36,6 +36,7 @@
#include "feature/nodelist/torcert.h"
#include "feature/relay/dns.h"
#include "feature/relay/relay_config.h"
+#include "feature/relay/relay_resolve_addr.h"
#include "feature/relay/router.h"
#include "feature/relay/routerkeys.h"
#include "feature/relay/routermode.h"
@@ -1763,41 +1764,6 @@ router_get_descriptor_gen_reason(void)
return desc_gen_reason;
}
-static int router_guess_address_from_dir_headers(uint32_t *guess);
-
-/** Make a current best guess at our address, either because
- * it's configured in torrc, or because we've learned it from
- * dirserver headers. Place the answer in *<b>addr</b> and return
- * 0 on success, else return -1 if we have no guess.
- *
- * If <b>cache_only</b> is true, just return any cached answers, and
- * don't try to get any new answers.
- */
-MOCK_IMPL(int,
-router_pick_published_address,(const or_options_t *options, uint32_t *addr,
- int cache_only))
-{
- /* First, check the cached output from resolve_my_address(). */
- *addr = get_last_resolved_addr();
- if (*addr)
- return 0;
-
- /* Second, consider doing a resolve attempt right here. */
- if (!cache_only) {
- if (resolve_my_address(LOG_INFO, options, addr, NULL, NULL) >= 0) {
- log_info(LD_CONFIG,"Success: chose address '%s'.", fmt_addr32(*addr));
- return 0;
- }
- }
-
- /* Third, check the cached output from router_new_address_suggestion(). */
- if (router_guess_address_from_dir_headers(addr) >= 0)
- return 0;
-
- /* We have no useful cached answers. Return failure. */
- return -1;
-}
-
/* Like router_check_descriptor_address_consistency, but specifically for the
* ORPort or DirPort.
* listener_type is either CONN_TYPE_OR_LISTENER or CONN_TYPE_DIR_LISTENER. */
@@ -2523,7 +2489,7 @@ check_descriptor_bandwidth_changed(time_t now)
/** Note at log level severity that our best guess of address has changed from
* <b>prev</b> to <b>cur</b>. */
-static void
+void
log_addr_has_changed(int severity,
const tor_addr_t *prev,
const tor_addr_t *cur,
@@ -2595,86 +2561,6 @@ check_descriptor_ipaddress_changed(time_t now)
tor_free(hostname);
}
-/** The most recently guessed value of our IP address, based on directory
- * headers. */
-static tor_addr_t last_guessed_ip = TOR_ADDR_NULL;
-
-/** A directory server <b>d_conn</b> told us our IP address is
- * <b>suggestion</b>.
- * If this address is different from the one we think we are now, and
- * if our computer doesn't actually know its IP address, then switch. */
-void
-router_new_address_suggestion(const char *suggestion,
- const dir_connection_t *d_conn)
-{
- tor_addr_t addr;
- uint32_t cur = 0; /* Current IPv4 address. */
- const or_options_t *options = get_options();
-
- /* first, learn what the IP address actually is */
- if (tor_addr_parse(&addr, suggestion) == -1) {
- log_debug(LD_DIR, "Malformed X-Your-Address-Is header %s. Ignoring.",
- escaped(suggestion));
- return;
- }
-
- log_debug(LD_DIR, "Got X-Your-Address-Is: %s.", suggestion);
-
- if (!server_mode(options)) {
- tor_addr_copy(&last_guessed_ip, &addr);
- return;
- }
-
- /* XXXX ipv6 */
- cur = get_last_resolved_addr();
- if (cur ||
- resolve_my_address(LOG_INFO, options, &cur, NULL, NULL) >= 0) {
- /* We're all set -- we already know our address. Great. */
- tor_addr_from_ipv4h(&last_guessed_ip, cur); /* store it in case we
- need it later */
- return;
- }
- if (tor_addr_is_internal(&addr, 0)) {
- /* Don't believe anybody who says our IP is, say, 127.0.0.1. */
- return;
- }
- if (tor_addr_eq(&d_conn->base_.addr, &addr)) {
- /* Don't believe anybody who says our IP is their IP. */
- log_debug(LD_DIR, "A directory server told us our IP address is %s, "
- "but they are just reporting their own IP address. Ignoring.",
- suggestion);
- return;
- }
-
- /* Okay. We can't resolve our own address, and X-Your-Address-Is is giving
- * us an answer different from what we had the last time we managed to
- * resolve it. */
- if (!tor_addr_eq(&last_guessed_ip, &addr)) {
- control_event_server_status(LOG_NOTICE,
- "EXTERNAL_ADDRESS ADDRESS=%s METHOD=DIRSERV",
- suggestion);
- log_addr_has_changed(LOG_NOTICE, &last_guessed_ip, &addr,
- d_conn->base_.address);
- ip_address_changed(0);
- tor_addr_copy(&last_guessed_ip, &addr); /* router_rebuild_descriptor()
- will fetch it */
- }
-}
-
-/** We failed to resolve our address locally, but we'd like to build
- * a descriptor and publish / test reachability. If we have a guess
- * about our address based on directory headers, answer it and return
- * 0; else return -1. */
-static int
-router_guess_address_from_dir_headers(uint32_t *guess)
-{
- if (!tor_addr_is_null(&last_guessed_ip)) {
- *guess = tor_addr_to_ipv4h(&last_guessed_ip);
- return 0;
- }
- return -1;
-}
-
/** Set <b>platform</b> (max length <b>len</b>) to a NUL-terminated short
* string describing the version of Tor and the operating system we're
* currently running on.
diff --git a/src/feature/relay/router.h b/src/feature/relay/router.h
index 39c550dd2..50790a73d 100644
--- a/src/feature/relay/router.h
+++ b/src/feature/relay/router.h
@@ -87,8 +87,6 @@ void mark_my_descriptor_dirty(const char *reason);
void check_descriptor_bandwidth_changed(time_t now);
void check_descriptor_ipaddress_changed(time_t now);
int router_has_bandwidth_to_be_dirserver(const or_options_t *options);
-void router_new_address_suggestion(const char *suggestion,
- const dir_connection_t *d_conn);
int router_compare_to_my_exit_policy(const tor_addr_t *addr, uint16_t port);
MOCK_DECL(int, router_my_exit_policy_is_reject_star,(void));
MOCK_DECL(const routerinfo_t *, router_get_my_routerinfo, (void));
@@ -100,9 +98,6 @@ int router_digest_is_me(const char *digest);
const uint8_t *router_get_my_id_digest(void);
int router_extrainfo_digest_is_me(const char *digest);
int router_is_me(const routerinfo_t *router);
-MOCK_DECL(int,router_pick_published_address,(const or_options_t *options,
- uint32_t *addr,
- int cache_only));
int router_build_fresh_descriptor(routerinfo_t **r, extrainfo_t **e);
int router_rebuild_descriptor(int force);
char *router_dump_router_to_string(routerinfo_t *router,
@@ -120,6 +115,9 @@ int extrainfo_dump_to_string(char **s, extrainfo_t *extrainfo,
const char *routerinfo_err_to_string(int err);
int routerinfo_err_is_transient(int err);
+void log_addr_has_changed(int severity, const tor_addr_t *prev,
+ const tor_addr_t *cur, const char *source);
+
void router_reset_warnings(void);
void router_free_all(void);
diff --git a/src/test/test_config.c b/src/test/test_config.c
index 9ccdbc72c..2a29d026b 100644
--- a/src/test/test_config.c
+++ b/src/test/test_config.c
@@ -42,6 +42,7 @@
#include "core/or/policies.h"
#include "feature/rend/rendclient.h"
#include "feature/rend/rendservice.h"
+#include "feature/relay/relay_resolve_addr.h"
#include "feature/relay/router.h"
#include "feature/relay/routermode.h"
#include "feature/nodelist/dirlist.h"
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