ctdb/protocol/protocol_header.c

   1 /*
   2    CTDB protocol marshalling
   3
   4    Copyright (C) Amitay Isaacs  2015
   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
  23 #include <talloc.h>
  24 #include <tdb.h>
  25
  26 #include "protocol.h"
  27 #include "protocol_api.h"
  28
  29 int ctdb_req_header_verify(struct ctdb_req_header *h, uint32_t operation)
  30 {
  31         if (h->length < sizeof(struct ctdb_req_header)) {
  32                 return EMSGSIZE;
  33         }
  34
  35         if (h->ctdb_magic != CTDB_MAGIC) {
  36                 return EPROTO;
  37         }
  38
  39         if (h->ctdb_version != CTDB_PROTOCOL) {
  40                 return EPROTO;
  41         }
  42
  43         if (operation != 0 && h->operation != operation) {
  44                 return EPROTO;
  45         }
  46
  47         return 0;
  48 }
  49
  50 void ctdb_req_header_fill(struct ctdb_req_header *h, uint32_t generation,
  51                           uint32_t operation, uint32_t destnode,
  52                           uint32_t srcnode, uint32_t reqid)
  53 {
  54         h->length = sizeof(struct ctdb_req_header);
  55         h->ctdb_magic = CTDB_MAGIC;
  56         h->ctdb_version = CTDB_PROTOCOL;
  57         h->generation = generation;
  58         h->operation = operation;
  59         h->destnode = destnode;
  60         h->srcnode = srcnode;
  61         h->reqid = reqid;
  62 }
  63
  64 int ctdb_req_header_pull(uint8_t *pkt, size_t pkt_len,
  65                          struct ctdb_req_header *h)
  66 {
  67         if (pkt_len < sizeof(struct ctdb_req_header)) {
  68                 return EMSGSIZE;
  69         }
  70
  71         memcpy(h, pkt, sizeof(struct ctdb_req_header));
  72         return 0;
  73 }