source4/lib/socket/connect.c

   1 /*
   2    Unix SMB/CIFS implementation.
   3
   4    implements a non-blocking connect operation that is aware of the samba4
   5    events system
   6
   7    Copyright (C) Andrew Tridgell 2005
   8    Copyright (C) Volker Lendecke 2005
   9
  10    This program is free software; you can redistribute it and/or modify
  11    it under the terms of the GNU General Public License as published by
  12    the Free Software Foundation; either version 3 of the License, or
  13    (at your option) any later version.
  14
  15    This program is distributed in the hope that it will be useful,
  16    but WITHOUT ANY WARRANTY; without even the implied warranty of
  17    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  18    GNU General Public License for more details.
  19
  20    You should have received a copy of the GNU General Public License
  21    along with this program.  If not, see <http://www.gnu.org/licenses/>.
  22 */
  23
  24 #include "includes.h"
  25 #include "lib/socket/socket.h"
  26 #include "lib/events/events.h"
  27 #include "libcli/composite/composite.h"
  28
  29
  30 struct connect_state {
  31         struct socket_context *sock;
  32         const struct socket_address *my_address;
  33         const struct socket_address *server_address;
  34         uint32_t flags;
  35 };
  36
  37 static void socket_connect_handler(struct tevent_context *ev,
  38                                    struct tevent_fd *fde,
  39                                    uint16_t flags, void *private_data);
  40
  41 /*
  42   call the real socket_connect() call, and setup event handler
  43 */
  44 static void socket_send_connect(struct composite_context *result)
  45 {
  46         struct tevent_fd *fde;
  47         struct connect_state *state = talloc_get_type(result->private_data,
  48                                                       struct connect_state);
  49
  50         result->status = socket_connect(state->sock,
  51                                         state->my_address,
  52                                         state->server_address,
  53                                         state->flags);
  54         if (NT_STATUS_IS_ERR(result->status) &&
  55             !NT_STATUS_EQUAL(result->status,
  56                              NT_STATUS_MORE_PROCESSING_REQUIRED)) {
  57                 composite_error(result, result->status);
  58                 return;
  59         }
  60
  61         fde = tevent_add_fd(result->event_ctx, result,
  62                            socket_get_fd(state->sock),
  63                            TEVENT_FD_READ|TEVENT_FD_WRITE,
  64                            socket_connect_handler, result);
  65         composite_nomem(fde, result);
  66 }
  67
  68
  69 /*
  70   send a socket connect, potentially doing some name resolution first
  71 */
  72 struct composite_context *socket_connect_send(struct socket_context *sock,
  73                                               struct socket_address *my_address,
  74                                               struct socket_address *server_address,
  75                                               uint32_t flags,
  76                                               struct tevent_context *event_ctx)
  77 {
  78         struct composite_context *result;
  79         struct connect_state *state;
  80
  81         result = composite_create(sock, event_ctx);
  82         if (result == NULL) return NULL;
  83
  84         state = talloc_zero(result, struct connect_state);
  85         if (composite_nomem(state, result)) return result;
  86         result->private_data = state;
  87
  88         state->sock = talloc_reference(state, sock);
  89         if (composite_nomem(state->sock, result)) return result;
  90
  91         if (my_address) {
  92                 void *ref = talloc_reference(state, my_address);
  93                 if (composite_nomem(ref, result)) {
  94                         return result;
  95                 }
  96                 state->my_address = my_address;
  97         }
  98
  99         {
 100                 void *ref = talloc_reference(state, server_address);
 101                 if (composite_nomem(ref, result)) {
 102                         return result;
 103                 }
 104                 state->server_address = server_address;
 105         }
 106
 107         state->flags = flags;
 108
 109         set_blocking(socket_get_fd(sock), false);
 110
 111         socket_send_connect(result);
 112
 113         return result;
 114 }
 115
 116 /*
 117   handle write events on connect completion
 118 */
 119 static void socket_connect_handler(struct tevent_context *ev,
 120                                    struct tevent_fd *fde,
 121                                    uint16_t flags, void *private_data)
 122 {
 123         struct composite_context *result =
 124                 talloc_get_type(private_data, struct composite_context);
 125         struct connect_state *state = talloc_get_type(result->private_data,
 126                                                       struct connect_state);
 127
 128         result->status = socket_connect_complete(state->sock, state->flags);
 129         if (!composite_is_ok(result)) return;
 130
 131         composite_done(result);
 132 }
 133
 134 /*
 135   wait for a socket_connect_send() to finish
 136 */
 137 NTSTATUS socket_connect_recv(struct composite_context *result)
 138 {
 139         NTSTATUS status = composite_wait(result);
 140         talloc_free(result);
 141         return status;
 142 }
 143
 144
 145 /*
 146   like socket_connect() but takes an event context, doing a semi-async connect
 147 */
 148 NTSTATUS socket_connect_ev(struct socket_context *sock,
 149                            struct socket_address *my_address,
 150                            struct socket_address *server_address,
 151                            uint32_t flags,
 152                            struct tevent_context *ev)
 153 {
 154         struct composite_context *ctx;
 155         ctx = socket_connect_send(sock, my_address,
 156                                   server_address, flags, ev);
 157         return socket_connect_recv(ctx);
 158 }