struct ResolvQuery *
resolv_query(const char *hostname, void (*client_cb)(struct Address *, void *), void (*client_free_cb)(void *), void *client_cb_data) {
struct dns_ctx *ctx = (struct dns_ctx *)resolv_io_watcher.data;
/*
* Wrap udns's call back in our own
*/
struct ResolvQuery *cb_data = malloc(sizeof(struct ResolvQuery));
if (cb_data == NULL) {
err("Failed to allocate memory for DNS query callback data.");
return NULL;
}
cb_data->client_cb = client_cb;
cb_data->client_free_cb = client_free_cb;
cb_data->client_cb_data = client_cb_data;
/* Just resolving A records for now */
cb_data->query = dns_submit_a4(ctx,
hostname, 0,
dns_query_cb, cb_data);
if (cb_data->query == NULL) {
err("Failed to submit DNS query: %s", dns_strerror(dns_status(ctx)));
cb_data->client_free_cb(cb_data->client_cb_data);
free(cb_data);
return NULL;
}
return cb_data;
}
/*@null@*/
static PyObject*
Resolver_submit_a4 (Resolver *self, PyObject *args) {
const char *domain;
PyObject *cb, *cb_data = Py_None;
Query *query;
int flags = 0;
if (!PyArg_ParseTuple(args, "sO|Oi", &domain, &cb, &cb_data, &flags)) {
PyErr_SetString(PyExc_TypeError, "Resolver.submit_a4(domain, callback, data=None, flags=0) wrong arguments.");
return NULL;
}
if (!cb || !PyCallable_Check(cb)) {
PyErr_SetString(PyExc_TypeError, "'callback' is not callable.");
return NULL;
}
query = (Query*)PyObject_CallObject((PyObject*)&QueryType, NULL);
if (NULL == query) {
PyErr_SetString(PyExc_MemoryError, "Can't create Query object.");
return NULL;
}
Py_INCREF(self);
query->resolver = (PyObject*)self;
Py_INCREF(cb);
query->callback = cb;
Py_INCREF(cb_data);
query->data = cb_data;
Py_INCREF(query);
query->q = dns_submit_a4(self->ctx, domain, flags, on_dns_resolve_a4, (void*)query);
return (PyObject*)query;
}
struct ResolvQuery *
resolv_query(const char *hostname, void (*client_cb)(struct sockaddr *, void *),
void (*client_free_cb)(void *), void *client_cb_data,
uint16_t port)
{
struct dns_ctx *ctx = (struct dns_ctx *)resolv_io_watcher.data;
/*
* Wrap udns's call back in our own
*/
struct ResolvQuery *cb_data = ss_malloc(sizeof(struct ResolvQuery));
if (cb_data == NULL) {
LOGE("Failed to allocate memory for DNS query callback data.");
return NULL;
}
memset(cb_data, 0, sizeof(struct ResolvQuery));
cb_data->client_cb = client_cb;
cb_data->client_free_cb = client_free_cb;
cb_data->client_cb_data = client_cb_data;
memset(cb_data->queries, 0, sizeof(cb_data->queries));
cb_data->response_count = 0;
cb_data->responses = NULL;
cb_data->port = port;
/* Submit A and AAAA queries */
if (resolv_mode != MODE_IPV6_ONLY) {
cb_data->queries[0] = dns_submit_a4(ctx,
hostname, 0,
dns_query_v4_cb, cb_data);
if (cb_data->queries[0] == NULL) {
LOGE("Failed to submit DNS query: %s",
dns_strerror(dns_status(ctx)));
}
}
if (resolv_mode != MODE_IPV4_ONLY) {
cb_data->queries[1] = dns_submit_a6(ctx,
hostname, 0,
dns_query_v6_cb, cb_data);
if (cb_data->queries[1] == NULL) {
LOGE("Failed to submit DNS query: %s",
dns_strerror(dns_status(ctx)));
}
}
if (all_queries_are_null(cb_data)) {
if (cb_data->client_free_cb != NULL) {
cb_data->client_free_cb(cb_data->client_cb_data);
}
ss_free(cb_data);
}
return cb_data;
}
static int submit(struct ipcheck *ipc) {
struct in_addr addr;
if (inet_aton(ipc->name, &addr)) {
submit_a_queries(ipc, 1, &addr);
ipc->name = NULL;
}
else if (!dns_submit_a4(0, ipc->name, 0, namecb, ipc))
fprintf(stderr, "%s: unable to submit name query for %s: %s\n",
progname, ipc->name, dns_strerror(dns_status(0)));
return 0;
}
static int submit(struct ipcheck *ipc) {
struct in_addr addr;
if (dns_pton(AF_INET, ipc->name, &addr) > 0) {
submit_a_queries(ipc, 1, &addr);
ipc->name = NULL;
}
else if (!dns_submit_a4(0, ipc->name, 0, namecb, ipc)) {
error(0, "unable to submit name query for %s: %s\n",
ipc->name, dns_strerror(dns_status(0)));
++failures;
}
return 0;
}
void QCrawlerDNS::async_resolve_host(const std::string &host, void *data)
{
assert(dns_loop);
ev_tstamp now = ev_now(dns_loop);
// check dns cache
if (dns_cache.find(host) != dns_cache.end()) {
QCrawlerDNSEntry &entry = dns_cache[host];
QCrawlerDNSFetchCallback cb = QCrawlerDNS::get_instance()->dns_fetch_callback();
if (!entry.addr_list.empty()) {
if (entry.resolve_time + ok_dns_cache_time >= now) {
entry.last_pos = (entry.last_pos + 1) % entry.addr_list.size();
if (cb) {
cb(0, &(entry.addr_list[entry.last_pos]), data);
}
return;
}
} else {
if (entry.resolve_time + fail_dns_cache_time > now) {
if (cb) {
cb(1, NULL, data);
}
return;
}
}
}
// submit dns task
if (!dns_submit_a4(dns_ctx, host.c_str(), 0, dns_a4_cb, data)) {
LOG(WARNING) << "dns sumit a4 eror";
}
}