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addr: Continue discovery if Address exits but not for wanted family

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Commit b14b1f2b1d was a mistake.

In case an Address statement is missing for the wanted family but another one
exists for another family, simply continue the address discovery.

It is not a mistake to be missing an Address statement for a family because
the address could simply be discovered by the next methods. Not all address
family requires a specific Address statement.

However, we do bail if we couldn't find any valid address for the requested
family _and_ a resolve failed meaning we had a hostname but couldn't resolve
it. In that case, we can't know if that hostname would have been for v4 or v6
thus we can't continue the address discovery properly.

Couple unit tests case were removed to match this reality.

Related #40025

Signed-off-by: David Goulet <dgoulet@torproject.org>
This commit is contained in:
David Goulet 2020-07-20 14:20:53 -04:00
parent b18e274919
commit c18e52af7c
2 changed files with 12 additions and 55 deletions
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20
src/app/config/resolve_addr.c
View File

@ -194,7 +194,7 @@ get_address_from_config(const or_options_t *options, int warn_severity,
char **hostname_out, tor_addr_t *addr_out)
{
int ret;
bool explicit_ip = false;
bool explicit_ip = false, resolve_failure = false;
int num_valid_addr = 0;
tor_assert(options);
@ -246,6 +246,7 @@ get_address_from_config(const or_options_t *options, int warn_severity,
continue;
} else {
/* Hostname that can't be resolved, this is a fatal error. */
resolve_failure = true;
log_fn(warn_severity, LD_CONFIG,
"Could not resolve local Address '%s'. Failing.", cfg->value);
continue;
@ -253,13 +254,16 @@ get_address_from_config(const or_options_t *options, int warn_severity,
}
if (!num_valid_addr) {
log_fn(warn_severity, LD_CONFIG,
"No Address option found for family %s in configuration.",
fmt_af_family(family));
/* No Address statement for family but one exists since Address is not
* NULL thus we have to stop now and not attempt to send back a guessed
* address. */
return FN_RET_BAIL;
if (resolve_failure) {
/* We found no address but we got a resolution failure. This means we
* can know if the hostname given was v4 or v6 so we can't continue. */
return FN_RET_BAIL;
}
log_info(LD_CONFIG,
"No Address option found for family %s in configuration.",
fmt_af_family(family));
/* No Address statement for family so move on to try next method. */
return FN_RET_NEXT;
}
if (num_valid_addr >= MAX_CONFIG_ADDRESS) {

47
src/test/test_config.c
View File

@ -1290,10 +1290,6 @@ test_config_find_my_address_mixed(void *arg)
"2a01:4f8:fff0:4f:266:37ff:fe2c:5d19");
tor_addr_parse(&test_addr, "2a01:4f8:fff0:4f:266:37ff:fe2c:5d19");
/* IPv4 address not guessed since one Address statement exists. */
retval = find_my_address(options, AF_INET, LOG_NOTICE, &resolved_addr,
&method_used, &hostname_out);
VALIDATE_FOUND_ADDRESS(false, NULL, NULL);
/* IPv6 address should be found and considered configured. */
retval = find_my_address(options, AF_INET6, LOG_NOTICE, &resolved_addr,
&method_used, &hostname_out);
@ -1542,49 +1538,6 @@ test_config_find_my_address(void *arg)
VALIDATE_FOUND_ADDRESS(false, NULL, NULL);
CLEANUP_FOUND_ADDRESS;
/*
* Case 6: Another address family is configured. Expected to fail.
*/
if (p->family == AF_INET) {
config_line_append(&options->Address, "Address", "4242::4242");
} else {
config_line_append(&options->Address, "Address", "1.1.1.1");
}
setup_full_capture_of_logs(LOG_NOTICE);
retval = find_my_address(options, p->family, LOG_NOTICE, &resolved_addr,
&method_used, &hostname_out);
expect_log_msg_containing("No Address option found for family");
teardown_capture_of_logs();
VALIDATE_FOUND_ADDRESS(false, NULL, NULL);
CLEANUP_FOUND_ADDRESS;
/*
* Case 7: Address is a non resolvable hostname. Expected to fail.
*/
MOCK(tor_addr_lookup, tor_addr_lookup_failure);
config_line_append(&options->Address, "Address", "www.torproject.org");
prev_n_hostname_failure = n_hostname_failure;
setup_full_capture_of_logs(LOG_NOTICE);
retval = find_my_address(options, p->family, LOG_NOTICE, &resolved_addr,
&method_used, &hostname_out);
expect_log_msg_containing("Could not resolve local Address "
"'www.torproject.org'. Failing.");
teardown_capture_of_logs();
tt_int_op(n_hostname_failure, OP_EQ, ++prev_n_hostname_failure);
VALIDATE_FOUND_ADDRESS(false, NULL, NULL);
CLEANUP_FOUND_ADDRESS;
UNMOCK(tor_addr_lookup);
/*
* Case 8:
* 1. Address is NULL