diff options
Diffstat (limited to 'source3/libsmb')
| -rw-r--r-- | source3/libsmb/namequery.c | 215 |
1 files changed, 215 insertions, 0 deletions
diff --git a/source3/libsmb/namequery.c b/source3/libsmb/namequery.c index c7b37b7db2..1356db88b5 100644 --- a/source3/libsmb/namequery.c +++ b/source3/libsmb/namequery.c @@ -23,6 +23,7 @@ #include "libads/dns.h" #include "../libcli/netlogon.h" #include "librpc/gen_ndr/messaging.h" +#include "lib/async_req/async_sock.h" /* nmbd.c sets this to True. */ bool global_in_nmbd = False; @@ -247,6 +248,220 @@ static struct node_status *parse_node_status(TALLOC_CTX *mem_ctx, char *p, return ret; } +struct sock_packet_read_state { + struct tevent_context *ev; + enum packet_type type; + int trn_id; + + struct nb_packet_reader *reader; + struct tevent_req *reader_req; + + int sock; + struct tevent_req *socket_req; + uint8_t buf[1024]; + struct sockaddr_storage addr; + socklen_t addr_len; + + bool (*validator)(struct packet_struct *p, + void *private_data); + void *private_data; + + struct packet_struct *packet; +}; + +static int sock_packet_read_state_destructor(struct sock_packet_read_state *s); +static void sock_packet_read_got_packet(struct tevent_req *subreq); +static void sock_packet_read_got_socket(struct tevent_req *subreq); + +static struct tevent_req *sock_packet_read_send( + TALLOC_CTX *mem_ctx, + struct tevent_context *ev, + int sock, /* dgram socket */ + struct nb_packet_reader *reader, + enum packet_type type, + int trn_id, + bool (*validator)(struct packet_struct *p, void *private_data), + void *private_data) +{ + struct tevent_req *req; + struct sock_packet_read_state *state; + + req = tevent_req_create(mem_ctx, &state, + struct sock_packet_read_state); + if (req == NULL) { + return NULL; + } + talloc_set_destructor(state, sock_packet_read_state_destructor); + state->ev = ev; + state->reader = reader; + state->sock = sock; + state->type = type; + state->trn_id = trn_id; + state->validator = validator; + state->private_data = private_data; + + if (reader != NULL) { + state->reader_req = nb_packet_read_send(state, ev, reader); + if (tevent_req_nomem(state->reader_req, req)) { + return tevent_req_post(req, ev); + } + tevent_req_set_callback( + state->reader_req, sock_packet_read_got_packet, req); + } + + state->addr_len = sizeof(state->addr); + state->socket_req = recvfrom_send(state, ev, sock, + state->buf, sizeof(state->buf), 0, + &state->addr, &state->addr_len); + if (tevent_req_nomem(state->socket_req, req)) { + return tevent_req_post(req, ev); + } + tevent_req_set_callback(state->socket_req, sock_packet_read_got_socket, + req); + + return req; +} + +static int sock_packet_read_state_destructor(struct sock_packet_read_state *s) +{ + if (s->packet != NULL) { + free_packet(s->packet); + s->packet = NULL; + } + return 0; +} + +static void sock_packet_read_got_packet(struct tevent_req *subreq) +{ + struct tevent_req *req = tevent_req_callback_data( + subreq, struct tevent_req); + struct sock_packet_read_state *state = tevent_req_data( + req, struct sock_packet_read_state); + NTSTATUS status; + + status = nb_packet_read_recv(subreq, &state->packet); + + TALLOC_FREE(state->reader_req); + + if (!NT_STATUS_IS_OK(status)) { + if (state->socket_req != NULL) { + /* + * Still waiting for socket + */ + return; + } + /* + * Both socket and packet reader failed + */ + tevent_req_nterror(req, status); + return; + } + + if ((state->validator != NULL) && + !state->validator(state->packet, state->private_data)) { + DEBUG(10, ("validator failed\n")); + + free_packet(state->packet); + state->packet = NULL; + + state->reader_req = nb_packet_read_send(state, state->ev, + state->reader); + if (tevent_req_nomem(state->reader_req, req)) { + return; + } + tevent_req_set_callback( + state->reader_req, sock_packet_read_got_packet, req); + return; + } + + TALLOC_FREE(state->socket_req); + tevent_req_done(req); +} + +static void sock_packet_read_got_socket(struct tevent_req *subreq) +{ + struct tevent_req *req = tevent_req_callback_data( + subreq, struct tevent_req); + struct sock_packet_read_state *state = tevent_req_data( + req, struct sock_packet_read_state); + struct sockaddr_in *in_addr; + ssize_t received; + int err; + + received = recvfrom_recv(subreq, &err); + + TALLOC_FREE(state->socket_req); + + if (received == -1) { + if (state->reader_req != NULL) { + /* + * Still waiting for reader + */ + return; + } + /* + * Both socket and reader failed + */ + tevent_req_nterror(req, map_nt_error_from_unix(err)); + return; + } + if (state->addr.ss_family != AF_INET) { + goto retry; + } + in_addr = (struct sockaddr_in *)(void *)&state->addr; + + state->packet = parse_packet((char *)state->buf, received, state->type, + in_addr->sin_addr, in_addr->sin_port); + if (state->packet == NULL) { + DEBUG(10, ("parse_packet failed\n")); + goto retry; + } + if ((state->trn_id != -1) && + (state->trn_id != packet_trn_id(state->packet))) { + DEBUG(10, ("Expected transaction id %d, got %d\n", + state->trn_id, packet_trn_id(state->packet))); + goto retry; + } + + if ((state->validator != NULL) && + !state->validator(state->packet, state->private_data)) { + DEBUG(10, ("validator failed\n")); + goto retry; + } + + tevent_req_done(req); + return; + +retry: + if (state->packet != NULL) { + free_packet(state->packet); + state->packet = NULL; + } + state->socket_req = recvfrom_send(state, state->ev, state->sock, + state->buf, sizeof(state->buf), 0, + &state->addr, &state->addr_len); + if (tevent_req_nomem(state->socket_req, req)) { + return; + } + tevent_req_set_callback(state->socket_req, sock_packet_read_got_socket, + req); +} + +static NTSTATUS sock_packet_read_recv(struct tevent_req *req, + struct packet_struct **ppacket) +{ + struct sock_packet_read_state *state = tevent_req_data( + req, struct sock_packet_read_state); + NTSTATUS status; + + if (tevent_req_is_nterror(req, &status)) { + return status; + } + *ppacket = state->packet; + state->packet = NULL; + return NT_STATUS_OK; +} + /**************************************************************************** Try and send a request to nmbd to send a packet_struct packet first. If this fails, use send_packet(). |