/*!
* \brief Callback to handle initializing the results field.
*
* \internal
*
* \param dns_response The full DNS response.
* \param dns_response The length of the full DNS response.
* \param rcode The DNS response code.
*
* \retval 0 on success
* \retval -1 on failure
*/
static int dns_system_resolver_set_response(void *context, unsigned char *dns_response, int dns_response_len, int rcode)
{
struct ast_dns_query *query = context;
int res;
/* Instantiate the query's result field (if necessary). */
if (!ast_dns_query_get_result(query)) {
res = ast_dns_resolver_set_result(query,
0,
0,
rcode,
ast_dns_query_get_name(query),
(const char*) dns_response,
dns_response_len);
if (res) {
/* There was a problem instantiating the results field. */
ast_log(LOG_ERROR, "Could not instantiate the results field for query: '%s'\n",
ast_dns_query_get_name(query));
}
} else {
res = DNS_SYSTEM_RESOLVER_SUCCESS;
}
return res;
}
/*!
* \brief Thread that performs asynchronous resolution.
*
* This thread uses the query's user data to determine how to
* perform the resolution. The query may either be canceled or
* it may be completed with records.
*
* \param dns_query The ast_dns_query that is being performed
* \return NULL
*/
static void *resolution_thread(void *dns_query)
{
struct ast_dns_query *query = dns_query;
static const char *ADDR1 = "127.0.0.1";
static const size_t ADDR1_BUFSIZE = sizeof(struct in_addr);
char addr1_buf[ADDR1_BUFSIZE];
static const char *ADDR2 = "192.168.0.1";
static const size_t ADDR2_BUFSIZE = sizeof(struct in_addr);
char addr2_buf[ADDR2_BUFSIZE];
struct ast_dns_query_recurring *recurring = ast_dns_query_get_data(query);
struct recurring_data *rdata = recurring->user_data;
ast_assert(rdata != NULL);
/* Canceling is an interesting dance. This thread needs to signal that it is
* ready to be canceled. Then it needs to wait until the query is actually canceled.
*/
if (rdata->cancel_expected) {
ast_mutex_lock(&rdata->lock);
rdata->cancel_ready = 1;
ast_cond_signal(&rdata->cond);
while (!rdata->canceled) {
ast_cond_wait(&rdata->cond, &rdata->lock);
}
ast_mutex_unlock(&rdata->lock);
ast_dns_resolver_completed(query);
ao2_ref(query, -1);
return NULL;
}
/* When the query isn't canceled, we set the TTL of the results based on what
* we've been told to set it to
*/
ast_dns_resolver_set_result(query, 0, 0, ns_r_noerror, "asterisk.org", DNS_ANSWER, DNS_ANSWER_SIZE);
inet_pton(AF_INET, ADDR1, addr1_buf);
ast_dns_resolver_add_record(query, ns_t_a, ns_c_in, rdata->ttl1, addr1_buf, ADDR1_BUFSIZE);
inet_pton(AF_INET, ADDR2, addr2_buf);
ast_dns_resolver_add_record(query, ns_t_a, ns_c_in, rdata->ttl2, addr2_buf, ADDR2_BUFSIZE);
++rdata->complete_resolutions;
ast_dns_resolver_completed(query);
ao2_ref(query, -1);
return NULL;
}
/*!
* \brief Thread spawned by the mock resolver
*
* All DNS resolvers are required to be asynchronous. The mock resolver
* spawns this thread for every DNS query that is executed.
*
* This thread waits for 5 seconds and then returns the same A record
* every time. The 5 second wait is to allow for the query to be
* canceled if desired
*
* \param dns_query The ast_dns_query that is being resolved
* \return NULL
*/
static void *resolution_thread(void *dns_query)
{
struct ast_dns_query *query = dns_query;
struct timespec timeout;
static const char *V4 = "127.0.0.1";
static const size_t V4_BUFSIZE = sizeof(struct in_addr);
char v4_buf[V4_BUFSIZE];
clock_gettime(CLOCK_REALTIME, &timeout);
timeout.tv_sec += 5;
ast_mutex_lock(&test_resolver_data.lock);
while (!test_resolver_data.canceled) {
if (ast_cond_timedwait(&test_resolver_data.cancel_cond, &test_resolver_data.lock, &timeout) == ETIMEDOUT) {
break;
}
}
ast_mutex_unlock(&test_resolver_data.lock);
if (test_resolver_data.canceled) {
ast_dns_resolver_completed(query);
ao2_ref(query, -1);
return NULL;
}
ast_dns_resolver_set_result(query, 0, 0, ns_r_noerror, "asterisk.org", DNS_ANSWER, DNS_ANSWER_SIZE);
inet_pton(AF_INET, V4, v4_buf);
ast_dns_resolver_add_record(query, ns_t_a, ns_c_in, 12345, v4_buf, V4_BUFSIZE);
test_resolver_data.resolution_complete = 1;
ast_dns_resolver_completed(query);
ao2_ref(query, -1);
return NULL;
}
static void *srv_thread(void *dns_query)
{
struct ast_dns_query *query = dns_query;
int i;
int ans_size;
ans_size = ast_dns_test_generate_result(query, test_records, num_test_records,
sizeof(struct srv_record), generate_srv_record, ans_buffer);
ast_dns_resolver_set_result(query, 0, 0, ns_r_noerror, "goose.feathers", ans_buffer, ans_size);
for (i = 0; i < num_test_records; ++i) {
char record[128];
int srv_size;
srv_size = generate_srv_record(&test_records[i], record);
ast_dns_resolver_add_record(query, ns_t_srv, ns_c_in, 12345, record, srv_size);
}
ast_dns_resolver_completed(query);
ao2_ref(query, -1);
return NULL;
}