commit 7795dd7ef6fa01202b91d20a0ac82eda1456cef8 Author: David Goulet dgoulet@torproject.org Date: Tue Jun 23 10:06:19 2020 -0400

addr: Refactor last resolved address cache accessors

Series of things done in this commit:

1. Rename the functions to better reflect the namespace of the file.

2. Make both reset and get function to operate on the last_resolved_addrs cache that is per family.

3. Make the get function to take a tor_addr_t.

4. Change all callsite to use the new convention.

Part of #33233

Signed-off-by: David Goulet dgoulet@torproject.org --- src/app/config/resolve_addr.c | 19 ++++++++++++------- src/app/config/resolve_addr.h | 4 ++-- src/core/mainloop/connection.c | 2 +- src/feature/relay/relay_find_addr.c | 26 +++++++++++++++++++------- 4 files changed, 34 insertions(+), 17 deletions(-)

diff --git a/src/app/config/resolve_addr.c b/src/app/config/resolve_addr.c index 9a7fbde16..1e861217d 100644 --- a/src/app/config/resolve_addr.c +++ b/src/app/config/resolve_addr.c @@ -47,18 +47,23 @@ static tor_addr_t last_resolved_addrs[IDX_SIZE]; /** Last value actually set by resolve_my_address. */ static uint32_t last_resolved_addr_v4 = 0;

-/** Accessor for last_resolved_addr_v4 from outside this file. */ -uint32_t -get_last_resolved_addr_v4(void) +/** Copy the last resolved address of family into addr_out. + * + * If not last resolved address existed, the addr_out is a null address (use + * tor_addr_is_null()). */ +void +resolved_addr_get_last(int family, tor_addr_t *addr_out) { - return last_resolved_addr_v4; + tor_addr_copy(addr_out, &last_resolved_addrs[family]); }

-/** Reset last_resolved_addr_v4 from outside this file. */ +/** Reset the last resolved address of family. + * + * This makes it null address. */ void -reset_last_resolved_addr_v4(void) +resolved_addr_reset_last(int family) { - last_resolved_addr_v4 = 0; + tor_addr_make_null(&last_resolved_addrs[family], family); }

/** @brief Return true iff the given IP address can be used as a valid diff --git a/src/app/config/resolve_addr.h b/src/app/config/resolve_addr.h index 2cd27d170..17e940203 100644 --- a/src/app/config/resolve_addr.h +++ b/src/app/config/resolve_addr.h @@ -19,8 +19,8 @@ bool find_my_address(const or_options_t *options, int family, int warn_severity, tor_addr_t *addr_out, const char **method_out, char **hostname_out);

-uint32_t get_last_resolved_addr_v4(void); -void reset_last_resolved_addr_v4(void); +void resolved_addr_get_last(int family, tor_addr_t *addr_out); +void resolved_addr_reset_last(int family);

MOCK_DECL(int, is_local_addr, (const tor_addr_t *addr));

diff --git a/src/core/mainloop/connection.c b/src/core/mainloop/connection.c index 9fff71ee0..3ebe18cd3 100644 --- a/src/core/mainloop/connection.c +++ b/src/core/mainloop/connection.c @@ -4870,7 +4870,7 @@ client_check_address_changed(tor_socket_t sock) smartlist_clear(outgoing_addrs); smartlist_add(outgoing_addrs, tor_memdup(&out_addr, sizeof(tor_addr_t))); /* We'll need to resolve ourselves again. */ - reset_last_resolved_addr_v4(); + resolved_addr_reset_last(AF_INET); /* Okay, now change our keys. */ ip_address_changed(1); } diff --git a/src/feature/relay/relay_find_addr.c b/src/feature/relay/relay_find_addr.c index cc08914f6..70cb77d4b 100644 --- a/src/feature/relay/relay_find_addr.c +++ b/src/feature/relay/relay_find_addr.c @@ -45,7 +45,7 @@ void router_new_address_suggestion(const char *suggestion, const dir_connection_t *d_conn) { - tor_addr_t addr; + tor_addr_t addr, last_resolved_addr; uint32_t cur = 0; /* Current IPv4 address. */ const or_options_t *options = get_options();

@@ -64,14 +64,22 @@ router_new_address_suggestion(const char *suggestion, }

/* XXXX ipv6 */ - cur = get_last_resolved_addr_v4(); - if (cur || - resolve_my_address_v4(LOG_INFO, options, &cur, NULL, NULL) >= 0) { + resolved_addr_get_last(AF_INET, &last_resolved_addr); + if (!tor_addr_is_null(&last_resolved_addr)) { + /* Lets use this one. */ + tor_addr_copy(&last_guessed_ip, &last_resolved_addr); + return; + } + + /* Attempt to find our address. */ + if (resolve_my_address_v4(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; } + + /* Consider the suggestion from the directory. */ if (tor_addr_is_internal(&addr, 0)) { /* Don't believe anybody who says our IP is, say, 127.0.0.1. */ return; @@ -111,10 +119,14 @@ 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_v4(); - if (*addr) + tor_addr_t last_resolved_addr; + + /* First, check the cached output from resolve_my_address_v4(). */ + resolved_addr_get_last(AF_INET, &last_resolved_addr); + if (!tor_addr_is_null(&last_resolved_addr)) { + *addr = tor_addr_to_ipv4h(&last_resolved_addr); return 0; + }

/* Second, consider doing a resolve attempt right here. */ if (!cache_only) {