ctdb/tcp/tcp_io.c

   1 /*
   2    ctdb over TCP
   3
   4    Copyright (C) Andrew Tridgell  2006
   5
   6    This program is free software; you can redistribute it and/or modify
   7    it under the terms of the GNU General Public License as published by
   8    the Free Software Foundation; either version 3 of the License, or
   9    (at your option) any later version.
  10
  11    This program is distributed in the hope that it will be useful,
  12    but WITHOUT ANY WARRANTY; without even the implied warranty of
  13    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  14    GNU General Public License for more details.
  15
  16    You should have received a copy of the GNU General Public License
  17    along with this program; if not, see <http://www.gnu.org/licenses/>.
  18 */
  19
  20 #include "replace.h"
  21 #include "system/network.h"
  22 #include "system/filesys.h"
  23
  24 #include "lib/util/dlinklist.h"
  25 #include "lib/util/debug.h"
  26
  27 #include "ctdb_private.h"
  28
  29 #include "common/common.h"
  30 #include "common/logging.h"
  31
  32 #include "ctdb_tcp.h"
  33
  34
  35 /*
  36   called when a complete packet has come in
  37  */
  38 void ctdb_tcp_read_cb(uint8_t *data, size_t cnt, void *args)
  39 {
  40         struct ctdb_node *node = talloc_get_type_abort(args, struct ctdb_node);
  41         struct ctdb_tcp_node *tnode = talloc_get_type_abort(
  42                 node->transport_data, struct ctdb_tcp_node);
  43         struct ctdb_req_header *hdr = (struct ctdb_req_header *)data;
  44
  45         if (data == NULL) {
  46                 /* incoming socket has died */
  47                 goto failed;
  48         }
  49
  50         if (cnt < sizeof(*hdr)) {
  51                 DEBUG(DEBUG_ALERT,(__location__ " Bad packet length %u\n", (unsigned)cnt));
  52                 goto failed;
  53         }
  54
  55         if (cnt & (CTDB_TCP_ALIGNMENT-1)) {
  56                 DEBUG(DEBUG_ALERT,(__location__ " Length 0x%x not multiple of alignment\n",
  57                          (unsigned)cnt));
  58                 goto failed;
  59         }
  60
  61         if (hdr->ctdb_magic != CTDB_MAGIC) {
  62                 DEBUG(DEBUG_ALERT,(__location__ " Non CTDB packet 0x%x rejected\n",
  63                          hdr->ctdb_magic));
  64                 goto failed;
  65         }
  66
  67         if (hdr->ctdb_version != CTDB_PROTOCOL) {
  68                 DEBUG(DEBUG_ALERT, (__location__ " Bad CTDB version 0x%x rejected\n",
  69                           hdr->ctdb_version));
  70                 goto failed;
  71         }
  72
  73         /* tell the ctdb layer above that we have a packet */
  74         tnode->ctdb->upcalls->recv_pkt(tnode->ctdb, data, cnt);
  75         return;
  76
  77 failed:
  78         node->ctdb->upcalls->node_dead(node);
  79
  80         TALLOC_FREE(data);
  81 }
  82
  83 /*
  84   queue a packet for sending
  85 */
  86 int ctdb_tcp_queue_pkt(struct ctdb_node *node, uint8_t *data, uint32_t length)
  87 {
  88         struct ctdb_tcp_node *tnode = talloc_get_type(node->transport_data,
  89                                                       struct ctdb_tcp_node);
  90         if (tnode->out_queue == NULL) {
  91                 DBG_DEBUG("No outgoing connection, dropping packet\n");
  92                 return 0;
  93         }
  94
  95         return ctdb_queue_send(tnode->out_queue, data, length);
  96 }