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-rw-r--r--source3/libsmb/namequery.c231
1 files changed, 231 insertions, 0 deletions
diff --git a/source3/libsmb/namequery.c b/source3/libsmb/namequery.c
index 1cd5eb79bb..d561049a73 100644
--- a/source3/libsmb/namequery.c
+++ b/source3/libsmb/namequery.c
@@ -1507,6 +1507,237 @@ static bool convert_ss2service(struct ip_service **return_iplist,
return true;
}
+struct name_queries_state {
+ struct tevent_context *ev;
+ const char *name;
+ int name_type;
+ bool bcast;
+ bool recurse;
+ const struct sockaddr_storage *addrs;
+ int num_addrs;
+ int wait_msec;
+ int timeout_msec;
+
+ struct tevent_req **subreqs;
+ int num_received;
+ int num_sent;
+
+ int received_index;
+ struct sockaddr_storage *result_addrs;
+ int num_result_addrs;
+ uint8_t flags;
+};
+
+static void name_queries_done(struct tevent_req *subreq);
+static void name_queries_next(struct tevent_req *subreq);
+
+/*
+ * Send a name query to multiple destinations with a wait time in between
+ */
+
+static struct tevent_req *name_queries_send(
+ TALLOC_CTX *mem_ctx, struct tevent_context *ev,
+ const char *name, int name_type,
+ bool bcast, bool recurse,
+ const struct sockaddr_storage *addrs,
+ int num_addrs, int wait_msec, int timeout_msec)
+{
+ struct tevent_req *req, *subreq;
+ struct name_queries_state *state;
+
+ req = tevent_req_create(mem_ctx, &state,
+ struct name_queries_state);
+ if (req == NULL) {
+ return NULL;
+ }
+ state->ev = ev;
+ state->name = name;
+ state->name_type = name_type;
+ state->bcast = bcast;
+ state->recurse = recurse;
+ state->addrs = addrs;
+ state->num_addrs = num_addrs;
+ state->wait_msec = wait_msec;
+ state->timeout_msec = timeout_msec;
+
+ state->subreqs = talloc_zero_array(
+ state, struct tevent_req *, num_addrs);
+ if (tevent_req_nomem(state->subreqs, req)) {
+ return tevent_req_post(req, ev);
+ }
+ state->num_sent = 0;
+
+ subreq = name_query_send(
+ state->subreqs, state->ev, name, name_type, bcast, recurse,
+ &state->addrs[state->num_sent]);
+ if (tevent_req_nomem(subreq, req)) {
+ return tevent_req_post(req, ev);
+ }
+ if (!tevent_req_set_endtime(
+ subreq, state->ev,
+ timeval_current_ofs(0, state->timeout_msec * 1000))) {
+ tevent_req_nomem(NULL, req);
+ return tevent_req_post(req, ev);
+ }
+ tevent_req_set_callback(subreq, name_queries_done, req);
+
+ state->subreqs[state->num_sent] = subreq;
+ state->num_sent += 1;
+
+ if (state->num_sent < state->num_addrs) {
+ subreq = tevent_wakeup_send(
+ state, state->ev,
+ timeval_current_ofs(0, state->wait_msec * 1000));
+ if (tevent_req_nomem(subreq, req)) {
+ return tevent_req_post(req, ev);
+ }
+ tevent_req_set_callback(subreq, name_queries_next, req);
+ }
+ return req;
+}
+
+static void name_queries_done(struct tevent_req *subreq)
+{
+ struct tevent_req *req = tevent_req_callback_data(
+ subreq, struct tevent_req);
+ struct name_queries_state *state = tevent_req_data(
+ req, struct name_queries_state);
+ int i;
+ NTSTATUS status;
+
+ status = name_query_recv(subreq, state, &state->result_addrs,
+ &state->num_result_addrs, &state->flags);
+
+ for (i=0; i<state->num_sent; i++) {
+ if (state->subreqs[i] == subreq) {
+ break;
+ }
+ }
+ if (i == state->num_sent) {
+ tevent_req_nterror(req, NT_STATUS_INTERNAL_ERROR);
+ return;
+ }
+ TALLOC_FREE(state->subreqs[i]);
+
+ state->num_received += 1;
+
+ if (!NT_STATUS_IS_OK(status)) {
+
+ if (state->num_received >= state->num_addrs) {
+ tevent_req_nterror(req, status);
+ return;
+ }
+ /*
+ * Still outstanding requests, just wait
+ */
+ return;
+ }
+ state->received_index = i;
+ tevent_req_done(req);
+}
+
+static void name_queries_next(struct tevent_req *subreq)
+{
+ struct tevent_req *req = tevent_req_callback_data(
+ subreq, struct tevent_req);
+ struct name_queries_state *state = tevent_req_data(
+ req, struct name_queries_state);
+
+ if (!tevent_wakeup_recv(subreq)) {
+ tevent_req_nterror(req, NT_STATUS_INTERNAL_ERROR);
+ return;
+ }
+
+ subreq = name_query_send(
+ state->subreqs, state->ev,
+ state->name, state->name_type, state->bcast, state->recurse,
+ &state->addrs[state->num_sent]);
+ if (tevent_req_nomem(subreq, req)) {
+ return;
+ }
+ tevent_req_set_callback(subreq, name_queries_done, req);
+ if (!tevent_req_set_endtime(
+ subreq, state->ev,
+ timeval_current_ofs(0, state->timeout_msec * 1000))) {
+ tevent_req_nomem(NULL, req);
+ return;
+ }
+ state->subreqs[state->num_sent] = subreq;
+ state->num_sent += 1;
+
+ if (state->num_sent < state->num_addrs) {
+ subreq = tevent_wakeup_send(
+ state, state->ev,
+ timeval_current_ofs(0, state->wait_msec * 1000));
+ if (tevent_req_nomem(subreq, req)) {
+ return;
+ }
+ tevent_req_set_callback(subreq, name_queries_next, req);
+ }
+}
+
+static NTSTATUS name_queries_recv(struct tevent_req *req, TALLOC_CTX *mem_ctx,
+ struct sockaddr_storage **result_addrs,
+ int *num_result_addrs, uint8_t *flags,
+ int *received_index)
+{
+ struct name_queries_state *state = tevent_req_data(
+ req, struct name_queries_state);
+ NTSTATUS status;
+
+ if (tevent_req_is_nterror(req, &status)) {
+ return status;
+ }
+
+ if (result_addrs != NULL) {
+ *result_addrs = talloc_move(mem_ctx, &state->result_addrs);
+ }
+ if (num_result_addrs != NULL) {
+ *num_result_addrs = state->num_result_addrs;
+ }
+ if (flags != NULL) {
+ *flags = state->flags;
+ }
+ if (received_index != NULL) {
+ *received_index = state->received_index;
+ }
+ return NT_STATUS_OK;
+}
+
+static NTSTATUS name_queries(const char *name, int name_type,
+ bool bcast, bool recurse,
+ const struct sockaddr_storage *addrs,
+ int num_addrs, int wait_msec, int timeout_msec,
+ TALLOC_CTX *mem_ctx,
+ struct sockaddr_storage **result_addrs,
+ int *num_result_addrs, uint8_t *flags,
+ int *received_index)
+{
+ TALLOC_CTX *frame = talloc_stackframe();
+ struct event_context *ev;
+ struct tevent_req *req;
+ NTSTATUS status = NT_STATUS_NO_MEMORY;
+
+ ev = event_context_init(frame);
+ if (ev == NULL) {
+ goto fail;
+ }
+ req = name_queries_send(frame, ev, name, name_type, bcast,
+ recurse, addrs, num_addrs, wait_msec,
+ timeout_msec);
+ if (req == NULL) {
+ goto fail;
+ }
+ if (!tevent_req_poll_ntstatus(req, ev, &status)) {
+ goto fail;
+ }
+ status = name_queries_recv(req, mem_ctx, result_addrs,
+ num_result_addrs, flags, received_index);
+ fail:
+ TALLOC_FREE(frame);
+ return status;
+}
+
/********************************************************
Resolve via "bcast" method.
*********************************************************/