diff options
Diffstat (limited to 'source4/lib/socket/connect.c')
| -rw-r--r-- | source4/lib/socket/connect.c | 216 |
1 files changed, 216 insertions, 0 deletions
diff --git a/source4/lib/socket/connect.c b/source4/lib/socket/connect.c new file mode 100644 index 0000000000..773bf41873 --- /dev/null +++ b/source4/lib/socket/connect.c @@ -0,0 +1,216 @@ +/* + 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" +#include "param/param.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); +} |