commit cc896f7c84c221d7dcfff1e0155533dce3ac5518 Author: Roger Dingledine <arma@torproject.org> Date: Mon Feb 11 17:09:10 2013 -0500 Teach resolve_my_address() to return a cached answer I didn't make any of the callers use this feature yet. --- src/or/config.c | 20 ++++++++++++++++++-- src/or/config.h | 3 ++- src/or/dirserv.c | 4 ++-- src/or/router.c | 6 +++--- src/or/routerlist.c | 3 ++- 5 files changed, 27 insertions(+), 9 deletions(-) diff --git a/src/or/config.c b/src/or/config.c index 7ca20e4..e37b148 100644 --- a/src/or/config.c +++ b/src/or/config.c @@ -1908,12 +1908,16 @@ static uint32_t last_resolved_addr = 0; * holding that hostname. (If we didn't get our address by resolving a * hostname, set *<b>hostname_out</b> to NULL.) * + * If <b>use_cached_addr</b> is true, and we have a plausible answer, + * provide that answer and return. + * * XXXX ipv6 */ int resolve_my_address(int warn_severity, const or_options_t *options, uint32_t *addr_out, - const char **method_out, char **hostname_out) + const char **method_out, char **hostname_out, + int use_cached_addr) { struct in_addr in; uint32_t addr; /* host order */ @@ -1931,6 +1935,18 @@ resolve_my_address(int warn_severity, const or_options_t *options, tor_assert(addr_out); /* + * Step zero: if used_cached_addr is true, and we have a cached answer, + * just return it and be done. + */ + + if (use_cached_addr && last_resolved_addr) { + *addr_out = last_resolved_addr; + if (method_out) + *method_out = "CACHED"; + return 0; + } + + /* * Step one: Fill in 'hostname' to be our best guess. */ @@ -2343,7 +2359,7 @@ options_validate(or_options_t *old_options, or_options_t *options, if (authdir_mode(options)) { /* confirm that our address isn't broken, so we can complain now */ uint32_t tmp; - if (resolve_my_address(LOG_WARN, options, &tmp, NULL, NULL) < 0) + if (resolve_my_address(LOG_WARN, options, &tmp, NULL, NULL, 0) < 0) REJECT("Failed to resolve/guess local address. See logs for details."); } diff --git a/src/or/config.h b/src/or/config.h index e0748a0..7ec52e3 100644 --- a/src/or/config.h +++ b/src/or/config.h @@ -28,7 +28,8 @@ setopt_err_t options_trial_assign(config_line_t *list, int use_defaults, int resolve_my_address(int warn_severity, const or_options_t *options, uint32_t *addr_out, - const char **method_out, char **hostname_out); + const char **method_out, char **hostname_out, + int use_cached_addr); int is_local_addr(const tor_addr_t *addr); void options_init(or_options_t *options); char *options_dump(const or_options_t *options, int minimal); diff --git a/src/or/dirserv.c b/src/or/dirserv.c index 0819d4b..280c6b4 100644 --- a/src/or/dirserv.c +++ b/src/or/dirserv.c @@ -2750,7 +2750,7 @@ dirserv_generate_networkstatus_vote_obj(crypto_pk_t *private_key, tor_assert(private_key); tor_assert(cert); - if (resolve_my_address(LOG_WARN, options, &addr, NULL, &hostname)<0) { + if (resolve_my_address(LOG_WARN, options, &addr, NULL, &hostname, 0)<0) { log_warn(LD_NET, "Couldn't resolve my hostname"); return NULL; } @@ -2960,7 +2960,7 @@ generate_v2_networkstatus_opinion(void) private_key = get_server_identity_key(); - if (resolve_my_address(LOG_WARN, options, &addr, NULL, &hostname)<0) { + if (resolve_my_address(LOG_WARN, options, &addr, NULL, &hostname, 0)<0) { log_warn(LD_NET, "Couldn't resolve my hostname"); goto done; } diff --git a/src/or/router.c b/src/or/router.c index 4492ed2..bc1c6d2 100644 --- a/src/or/router.c +++ b/src/or/router.c @@ -1712,7 +1712,7 @@ static int router_guess_address_from_dir_headers(uint32_t *guess); int router_pick_published_address(const or_options_t *options, uint32_t *addr) { - if (resolve_my_address(LOG_INFO, options, addr, NULL, NULL) < 0) { + if (resolve_my_address(LOG_INFO, options, addr, NULL, NULL, 0) < 0) { log_info(LD_CONFIG, "Could not determine our address locally. " "Checking if directory headers provide any hints."); if (router_guess_address_from_dir_headers(addr) < 0) { @@ -2103,7 +2103,7 @@ check_descriptor_ipaddress_changed(time_t now) /* XXXX ipv6 */ prev = desc_routerinfo->addr; - if (resolve_my_address(LOG_INFO, options, &cur, &method, &hostname) < 0) { + if (resolve_my_address(LOG_INFO, options, &cur, &method, &hostname, 0) < 0) { log_info(LD_CONFIG,"options->Address didn't resolve into an IP."); return; } @@ -2159,7 +2159,7 @@ router_new_address_suggestion(const char *suggestion, } /* XXXX ipv6 */ - if (resolve_my_address(LOG_INFO, options, &cur, NULL, NULL) >= 0) { + if (resolve_my_address(LOG_INFO, options, &cur, NULL, NULL, 0) >= 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 */ diff --git a/src/or/routerlist.c b/src/or/routerlist.c index 90b707b..2dde89b 100644 --- a/src/or/routerlist.c +++ b/src/or/routerlist.c @@ -3951,7 +3951,8 @@ trusted_dir_server_new(const char *nickname, const char *address, dir_server_t *result; if (!address) { /* The address is us; we should guess. */ - if (resolve_my_address(LOG_WARN, get_options(), &a, NULL, &hostname) < 0) { + if (resolve_my_address(LOG_WARN, get_options(), + &a, NULL, &hostname, 0) < 0) { log_warn(LD_CONFIG, "Couldn't find a suitable address when adding ourself as a " "trusted directory server.");