source4/lib/messaging/messaging_send.c

   1 /*
   2    Unix SMB/CIFS implementation.
   3
   4    Samba internal messaging functions (send).
   5
   6    Copyright (C) Andrew Tridgell 2004
   7
   8    This program is free software; you can redistribute it and/or modify
   9    it under the terms of the GNU General Public License as published by
  10    the Free Software Foundation; either version 3 of the License, or
  11    (at your option) any later version.
  12
  13    This program is distributed in the hope that it will be useful,
  14    but WITHOUT ANY WARRANTY; without even the implied warranty of
  15    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  16    GNU General Public License for more details.
  17
  18    You should have received a copy of the GNU General Public License
  19    along with this program.  If not, see <http://www.gnu.org/licenses/>.
  20 */
  21
  22 #include "includes.h"
  23 #include "messaging/messaging.h"
  24 #include "messaging/irpc.h"
  25 #include "lib/messaging/messages_dgm.h"
  26 #include "lib/messaging/messages_dgm_ref.h"
  27 #include "../source3/lib/messages_util.h"
  28 #include "messaging/messaging_internal.h"
  29 #include "lib/util/server_id_db.h"
  30 #include "cluster/cluster.h"
  31 #include "../lib/util/unix_privs.h"
  32
  33 /*
  34  * This file is for functions that can be called from auth_log without
  35  * depending on all of dcerpc and so cause dep loops.
  36  */
  37
  38 /*
  39   return a list of server ids for a server name
  40 */
  41 NTSTATUS irpc_servers_byname(struct imessaging_context *msg_ctx,
  42                              TALLOC_CTX *mem_ctx, const char *name,
  43                              unsigned *num_servers,
  44                              struct server_id **servers)
  45 {
  46         int ret;
  47
  48         ret = server_id_db_lookup(msg_ctx->names, name, mem_ctx,
  49                                   num_servers, servers);
  50         if (ret != 0) {
  51                 return map_nt_error_from_unix_common(ret);
  52         }
  53         return NT_STATUS_OK;
  54 }
  55
  56 /*
  57   Send a message to a particular server
  58 */
  59 NTSTATUS imessaging_send(struct imessaging_context *msg, struct server_id server,
  60                         uint32_t msg_type, const DATA_BLOB *data)
  61 {
  62         uint8_t hdr[MESSAGE_HDR_LENGTH];
  63         struct iovec iov[2];
  64         int num_iov, ret;
  65         pid_t pid;
  66         void *priv;
  67
  68         if (!cluster_node_equal(&msg->server_id, &server)) {
  69                 /* No cluster in source4... */
  70                 return NT_STATUS_OK;
  71         }
  72
  73         message_hdr_put(hdr, msg_type, msg->server_id, server);
  74
  75         iov[0] = (struct iovec) { .iov_base = &hdr, .iov_len = sizeof(hdr) };
  76         num_iov = 1;
  77
  78         if (data != NULL) {
  79                 iov[1] = (struct iovec) { .iov_base = data->data,
  80                                           .iov_len = data->length };
  81                 num_iov += 1;
  82         }
  83
  84         pid = server.pid;
  85         if (pid == 0) {
  86                 pid = getpid();
  87         }
  88
  89         ret = messaging_dgm_send(pid, iov, num_iov, NULL, 0);
  90
  91         if (ret == EACCES) {
  92                 priv = root_privileges();
  93                 ret = messaging_dgm_send(pid, iov, num_iov, NULL, 0);
  94                 TALLOC_FREE(priv);
  95         }
  96
  97         if (ret != 0) {
  98                 return map_nt_error_from_unix_common(ret);
  99         }
 100         return NT_STATUS_OK;
 101 }
 102
 103 /*
 104   Send a message to a particular server, with the message containing a single pointer
 105 */
 106 NTSTATUS imessaging_send_ptr(struct imessaging_context *msg, struct server_id server,
 107                             uint32_t msg_type, void *ptr)
 108 {
 109         DATA_BLOB blob;
 110
 111         blob.data = (uint8_t *)&ptr;
 112         blob.length = sizeof(void *);
 113
 114         return imessaging_send(msg, server, msg_type, &blob);
 115 }