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/*
ctdb ip takeover code
Copyright (C) Ronnie Sahlberg 2007
Copyright (C) Andrew Tridgell 2007
Copyright (C) Martin Schwenke 2011
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 3 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program; if not, see <http://www.gnu.org/licenses/>.
*/
#include "replace.h"
#include "system/network.h"
#include "lib/util/debug.h"
#include "common/logging.h"
#include "common/path.h"
#include "protocol/protocol_util.h"
#include "lib/util/smb_strtox.h"
#include "lib/util/memory.h"
#include "server/ipalloc_private.h"
struct home_node {
ctdb_sock_addr addr;
uint32_t pnn;
};
static struct home_node *ipalloc_get_home_nodes(TALLOC_CTX *mem_ctx)
{
char *line = NULL;
size_t len = 0;
char *fname = NULL;
FILE *fp = NULL;
struct home_node *result = NULL;
fname = path_etcdir_append(mem_ctx, "home_nodes");
if (fname == NULL) {
goto fail;
}
fp = fopen(fname, "r");
if (fp == NULL) {
goto fail;
}
TALLOC_FREE(fname);
while (true) {
size_t num_nodes = talloc_array_length(result);
char *saveptr = NULL, *addrstr = NULL, *nodestr = NULL;
struct home_node hn = {
.pnn = CTDB_UNKNOWN_PNN,
};
struct home_node *tmp = NULL;
ssize_t n = 0;
int ret;
n = getline(&line, &len, fp);
if (n < 0) {
if (!feof(fp)) {
/* real error */
goto fail;
}
break;
}
if ((n > 0) && (line[n - 1] == '\n')) {
line[n - 1] = '\0';
}
addrstr = strtok_r(line, " \t", &saveptr);
if (addrstr == NULL) {
continue;
}
nodestr = strtok_r(NULL, " \t", &saveptr);
if (nodestr == NULL) {
continue;
}
ret = ctdb_sock_addr_from_string(addrstr, &hn.addr, false);
if (ret != 0) {
DBG_WARNING("Could not parse %s: %s\n",
addrstr,
strerror(ret));
goto fail;
}
hn.pnn = smb_strtoul(nodestr,
NULL,
10,
&ret,
SMB_STR_FULL_STR_CONV);
if (ret != 0) {
DBG_WARNING("Could not parse \"%s\"\n", nodestr);
goto fail;
}
tmp = talloc_realloc(mem_ctx,
result,
struct home_node,
num_nodes + 1);
if (tmp == NULL) {
goto fail;
}
result = tmp;
result[num_nodes] = hn;
}
fclose(fp);
fp = NULL;
return result;
fail:
if (fp != NULL) {
fclose(fp);
fp = NULL;
}
SAFE_FREE(line);
TALLOC_FREE(fname);
TALLOC_FREE(result);
return NULL;
}
bool ipalloc_deterministic(struct ipalloc_state *ipalloc_state)
{
struct home_node *home_nodes = ipalloc_get_home_nodes(ipalloc_state);
size_t num_home_nodes = talloc_array_length(home_nodes);
struct public_ip_list *t;
int i;
uint32_t numnodes;
numnodes = ipalloc_state->num;
DEBUG(DEBUG_NOTICE,("Deterministic IPs enabled. Resetting all ip allocations\n"));
/* Allocate IPs to nodes in a modulo fashion so that IPs will
* always be allocated the same way for a specific set of
* available/unavailable nodes.
*/
for (i = 0, t = ipalloc_state->all_ips; t!= NULL; t = t->next, i++) {
size_t j;
t->pnn = i % numnodes;
for (j = 0; j < num_home_nodes; j++) {
struct home_node *hn = &home_nodes[j];
if (ctdb_sock_addr_same_ip(&t->addr, &hn->addr)) {
if (hn->pnn >= numnodes) {
DBG_WARNING("pnn %" PRIu32
" too large\n",
hn->pnn);
break;
}
t->pnn = hn->pnn;
break;
}
}
}
/* IP failback doesn't make sense with deterministic
* IPs, since the modulo step above implicitly fails
* back IPs to their "home" node.
*/
if (ipalloc_state->no_ip_failback) {
D_WARNING("WARNING: 'NoIPFailback' set but ignored - "
"incompatible with 'Deterministic IPs\n");
}
unassign_unsuitable_ips(ipalloc_state);
basic_allocate_unassigned(ipalloc_state);
/* No failback here! */
TALLOC_FREE(home_nodes);
return true;
}
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