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_incoming *in = talloc_get_type(args, struct ctdb_incoming);
  41         struct ctdb_req_header *hdr = (struct ctdb_req_header *)data;
  42
  43         if (data == NULL) {
  44                 /* incoming socket has died */
  45                 goto failed;
  46         }
  47
  48         if (cnt < sizeof(*hdr)) {
  49                 DEBUG(DEBUG_ALERT,(__location__ " Bad packet length %u\n", (unsigned)cnt));
  50                 goto failed;
  51         }
  52
  53         if (cnt & (CTDB_TCP_ALIGNMENT-1)) {
  54                 DEBUG(DEBUG_ALERT,(__location__ " Length 0x%x not multiple of alignment\n",
  55                          (unsigned)cnt));
  56                 goto failed;
  57         }
  58
  59
  60         if (cnt != hdr->length) {
  61                 DEBUG(DEBUG_ALERT,(__location__ " Bad header length %u expected %u\n",
  62                          (unsigned)hdr->length, (unsigned)cnt));
  63                 goto failed;
  64         }
  65
  66         if (hdr->ctdb_magic != CTDB_MAGIC) {
  67                 DEBUG(DEBUG_ALERT,(__location__ " Non CTDB packet 0x%x rejected\n",
  68                          hdr->ctdb_magic));
  69                 goto failed;
  70         }
  71
  72         if (hdr->ctdb_version != CTDB_PROTOCOL) {
  73                 DEBUG(DEBUG_ALERT, (__location__ " Bad CTDB version 0x%x rejected\n",
  74                           hdr->ctdb_version));
  75                 goto failed;
  76         }
  77
  78         /* tell the ctdb layer above that we have a packet */
  79         in->ctdb->upcalls->recv_pkt(in->ctdb, data, cnt);
  80         return;
  81
  82 failed:
  83         talloc_free(in);
  84 }
  85
  86 /*
  87   queue a packet for sending
  88 */
  89 int ctdb_tcp_queue_pkt(struct ctdb_node *node, uint8_t *data, uint32_t length)
  90 {
  91         struct ctdb_tcp_node *tnode = talloc_get_type(node->private_data,
  92                                                       struct ctdb_tcp_node);
  93         return ctdb_queue_send(tnode->out_queue, data, length);
  94 }