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 #include "protocol_private.h"
  29
  30 int ctdb_req_header_verify(struct ctdb_req_header *h, uint32_t operation)
  31 {
  32         if (h->length < sizeof(struct ctdb_req_header)) {
  33                 return EMSGSIZE;
  34         }
  35
  36         if (h->ctdb_magic != CTDB_MAGIC) {
  37                 return EPROTO;
  38         }
  39
  40         if (h->ctdb_version != CTDB_PROTOCOL) {
  41                 return EPROTO;
  42         }
  43
  44         if (operation != 0 && h->operation != operation) {
  45                 return EPROTO;
  46         }
  47
  48         return 0;
  49 }
  50
  51 void ctdb_req_header_fill(struct ctdb_req_header *h, uint32_t generation,
  52                           uint32_t operation, uint32_t destnode,
  53                           uint32_t srcnode, uint32_t reqid)
  54 {
  55         h->length = sizeof(struct ctdb_req_header);
  56         h->ctdb_magic = CTDB_MAGIC;
  57         h->ctdb_version = CTDB_PROTOCOL;
  58         h->generation = generation;
  59         h->operation = operation;
  60         h->destnode = destnode;
  61         h->srcnode = srcnode;
  62         h->reqid = reqid;
  63 }
  64
  65 size_t ctdb_req_header_len(struct ctdb_req_header *in)
  66 {
  67         return ctdb_uint32_len(&in->length) +
  68                 ctdb_uint32_len(&in->ctdb_magic) +
  69                 ctdb_uint32_len(&in->ctdb_version) +
  70                 ctdb_uint32_len(&in->generation) +
  71                 ctdb_uint32_len(&in->operation) +
  72                 ctdb_uint32_len(&in->destnode) +
  73                 ctdb_uint32_len(&in->srcnode) +
  74                 ctdb_uint32_len(&in->reqid);
  75 }
  76
  77 void ctdb_req_header_push(struct ctdb_req_header *in, uint8_t *buf,
  78                           size_t *npush)
  79 {
  80         size_t offset = 0, np;
  81
  82         ctdb_uint32_push(&in->length, buf+offset, &np);
  83         offset += np;
  84
  85         ctdb_uint32_push(&in->ctdb_magic, buf+offset, &np);
  86         offset += np;
  87
  88         ctdb_uint32_push(&in->ctdb_version, buf+offset, &np);
  89         offset += np;
  90
  91         ctdb_uint32_push(&in->generation, buf+offset, &np);
  92         offset += np;
  93
  94         ctdb_uint32_push(&in->operation, buf+offset, &np);
  95         offset += np;
  96
  97         ctdb_uint32_push(&in->destnode, buf+offset, &np);
  98         offset += np;
  99
 100         ctdb_uint32_push(&in->srcnode, buf+offset, &np);
 101         offset += np;
 102
 103         ctdb_uint32_push(&in->reqid, buf+offset, &np);
 104         offset += np;
 105
 106         *npush = offset;
 107 }
 108
 109 int ctdb_req_header_pull(uint8_t *buf, size_t buflen,
 110                          struct ctdb_req_header *out, size_t *npull)
 111 {
 112         size_t offset = 0, np;
 113         int ret;
 114
 115         ret = ctdb_uint32_pull(buf+offset, buflen-offset, &out->length, &np);
 116         if (ret != 0) {
 117                 return ret;
 118         }
 119         offset += np;
 120
 121         ret = ctdb_uint32_pull(buf+offset, buflen-offset, &out->ctdb_magic,
 122                                &np);
 123         if (ret != 0) {
 124                 return ret;
 125         }
 126         offset += np;
 127
 128         ret = ctdb_uint32_pull(buf+offset, buflen-offset, &out->ctdb_version,
 129                                &np);
 130         if (ret != 0) {
 131                 return ret;
 132         }
 133         offset += np;
 134
 135         ret = ctdb_uint32_pull(buf+offset, buflen-offset, &out->generation,
 136                                &np);
 137         if (ret != 0) {
 138                 return ret;
 139         }
 140         offset += np;
 141
 142         ret = ctdb_uint32_pull(buf+offset, buflen-offset, &out->operation,
 143                                &np);
 144         if (ret != 0) {
 145                 return ret;
 146         }
 147         offset += np;
 148
 149         ret = ctdb_uint32_pull(buf+offset, buflen-offset, &out->destnode, &np);
 150         if (ret != 0) {
 151                 return ret;
 152         }
 153         offset += np;
 154
 155         ret = ctdb_uint32_pull(buf+offset, buflen-offset, &out->srcnode, &np);
 156         if (ret != 0) {
 157                 return ret;
 158         }
 159         offset += np;
 160
 161         ret = ctdb_uint32_pull(buf+offset, buflen-offset, &out->reqid, &np);
 162         if (ret != 0) {
 163                 return ret;
 164         }
 165         offset += np;
 166
 167         *npull = offset;
 168         return 0;
 169 }