/* Unix SMB/CIFS implementation. implements a non-blocking connect operation that is aware of the samba4 events system Copyright (C) Andrew Tridgell 2005 Copyright (C) Volker Lendecke 2005 This program is free software; you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation; either version 3 of the License, or (at your option) any later version. This program is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for more details. You should have received a copy of the GNU General Public License along with this program. If not, see <http://www.gnu.org/licenses/>. */ #include "includes.h" #include "lib/socket/socket.h" #include "lib/events/events.h" #include "libcli/composite/composite.h" #include "libcli/resolve/resolve.h" struct connect_state { struct socket_context *sock; const struct socket_address *my_address; const struct socket_address *server_address; uint32_t flags; }; static void socket_connect_handler(struct event_context *ev, struct fd_event *fde, uint16_t flags, void *private); static void continue_resolve_name(struct composite_context *ctx); static void continue_socket_connect(struct composite_context *creq); /* call the real socket_connect() call, and setup event handler */ static void socket_send_connect(struct composite_context *result) { struct composite_context *creq; struct fd_event *fde; struct connect_state *state = talloc_get_type(result->private_data, struct connect_state); creq = talloc_zero(state, struct composite_context); if (composite_nomem(creq, result)) return; creq->state = COMPOSITE_STATE_IN_PROGRESS; creq->event_ctx = result->event_ctx; creq->async.fn = continue_socket_connect; creq->async.private_data = result; result->status = socket_connect(state->sock, state->my_address, state->server_address, state->flags); if (NT_STATUS_IS_ERR(result->status) && !NT_STATUS_EQUAL(result->status, NT_STATUS_MORE_PROCESSING_REQUIRED)) { composite_error(result, result->status); return; } fde = event_add_fd(result->event_ctx, result, socket_get_fd(state->sock), EVENT_FD_READ|EVENT_FD_WRITE, socket_connect_handler, result); composite_nomem(fde, result); } /* send a socket connect, potentially doing some name resolution first */ struct composite_context *socket_connect_send(struct socket_context *sock, struct socket_address *my_address, struct socket_address *server_address, uint32_t flags, struct resolve_context *resolve_ctx, struct event_context *event_ctx) { struct composite_context *result; struct connect_state *state; result = talloc_zero(sock, struct composite_context); if (result == NULL) return NULL; result->state = COMPOSITE_STATE_IN_PROGRESS; result->event_ctx = event_ctx; state = talloc_zero(result, struct connect_state); if (composite_nomem(state, result)) return result; result->private_data = state; state->sock = talloc_reference(state, sock); if (composite_nomem(state->sock, result)) return result; if (my_address) { void *ref = talloc_reference(state, my_address); if (composite_nomem(ref, result)) { return result; } state->my_address = my_address; } { void *ref = talloc_reference(state, server_address); if (composite_nomem(ref, result)) { return result; } state->server_address = server_address; } state->flags = flags; set_blocking(socket_get_fd(sock), false); if (resolve_ctx != NULL && server_address->addr && strcmp(sock->backend_name, "ipv4") == 0) { struct nbt_name name; struct composite_context *creq; make_nbt_name_client(&name, server_address->addr); creq = resolve_name_send(resolve_ctx, &name, result->event_ctx); if (composite_nomem(creq, result)) return result; composite_continue(result, creq, continue_resolve_name, result); return result; } socket_send_connect(result); return result; } /* handle write events on connect completion */ static void socket_connect_handler(struct event_context *ev, struct fd_event *fde, uint16_t flags, void *private) { struct composite_context *result = talloc_get_type(private, struct composite_context); struct connect_state *state = talloc_get_type(result->private_data, struct connect_state); result->status = socket_connect_complete(state->sock, state->flags); if (!composite_is_ok(result)) return; composite_done(result); } /* recv name resolution reply then send the connect */ static void continue_resolve_name(struct composite_context *creq) { struct composite_context *result = talloc_get_type(creq->async.private_data, struct composite_context); struct connect_state *state = talloc_get_type(result->private_data, struct connect_state); const char *addr; result->status = resolve_name_recv(creq, state, &addr); if (!composite_is_ok(result)) return; state->server_address = socket_address_from_strings(state, state->sock->backend_name, addr, state->server_address->port); if (composite_nomem(state->server_address, result)) return; socket_send_connect(result); } /* called when a connect has finished. Complete the top level composite context */ static void continue_socket_connect(struct composite_context *creq) { struct composite_context *result = talloc_get_type(creq->async.private_data, struct composite_context); result->status = creq->status; if (!composite_is_ok(result)) return; composite_done(result); } /* wait for a socket_connect_send() to finish */ NTSTATUS socket_connect_recv(struct composite_context *result) { NTSTATUS status = composite_wait(result); talloc_free(result); return status; } /* like socket_connect() but takes an event context, doing a semi-async connect */ NTSTATUS socket_connect_ev(struct socket_context *sock, struct socket_address *my_address, struct socket_address *server_address, uint32_t flags, struct resolve_context *resolve_ctx, struct event_context *ev) { struct composite_context *ctx; ctx = socket_connect_send(sock, my_address, server_address, flags, resolve_ctx, ev); return socket_connect_recv(ctx); }