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/*
* virlease.c: Leases file handling
*
* Copyright (C) 2014 Red Hat, Inc.
* Copyright (C) 2014 Nehal J Wani
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2.1 of the License, or (at your option) any later version.
*
* This library 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
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this library. If not, see
* <http://www.gnu.org/licenses/>.
*
*/
#include <config.h>
#include "virlease.h"
#include <time.h>
#include "virfile.h"
#include "virstring.h"
#include "virerror.h"
#define VIR_FROM_THIS VIR_FROM_NETWORK
/**
* VIR_NETWORK_DHCP_LEASE_FILE_SIZE_MAX:
*
* Macro providing the upper limit on the size of leases file
*/
#define VIR_NETWORK_DHCP_LEASE_FILE_SIZE_MAX (32 * 1024 * 1024)
int
virLeaseReadCustomLeaseFile(virJSONValue *leases_array_new,
const char *custom_lease_file,
const char *ip_to_delete,
char **server_duid)
{
g_autofree char *lease_entries = NULL;
g_autoptr(virJSONValue) leases_array = NULL;
int custom_lease_file_len = 0;
size_t i;
/* Read entire contents */
if ((custom_lease_file_len = virFileReadAll(custom_lease_file,
VIR_NETWORK_DHCP_LEASE_FILE_SIZE_MAX,
&lease_entries)) < 0) {
return -1;
}
/* Check for previous leases */
if (custom_lease_file_len == 0)
return 0;
if (!(leases_array = virJSONValueFromString(lease_entries))) {
virReportError(VIR_ERR_INTERNAL_ERROR,
_("invalid json in file: %1$s, rewriting it"),
custom_lease_file);
return 0;
}
if (!virJSONValueIsArray(leases_array)) {
virReportError(VIR_ERR_INTERNAL_ERROR, "%s",
_("couldn't fetch array of leases"));
return -1;
}
i = 0;
while (i < virJSONValueArraySize(leases_array)) {
virJSONValue *lease_tmp = virJSONValueArrayGet(leases_array, i);
long long expirytime;
const char *ip_tmp = NULL;
if (!lease_tmp) {
virReportError(VIR_ERR_INTERNAL_ERROR, "%s",
_("failed to parse json"));
return -1;
}
if (!(ip_tmp = virJSONValueObjectGetString(lease_tmp, "ip-address")) ||
(virJSONValueObjectGetNumberLong(lease_tmp, "expiry-time", &expirytime) < 0)) {
virReportError(VIR_ERR_INTERNAL_ERROR, "%s",
_("failed to parse json"));
return -1;
}
/* Check whether lease has to be included or not */
if (ip_to_delete && STREQ(ip_tmp, ip_to_delete)) {
i++;
continue;
}
if (server_duid && strchr(ip_tmp, ':')) {
const char *server_duid_tmp = NULL;
/* This is an ipv6 lease */
if ((server_duid_tmp = virJSONValueObjectGetString(lease_tmp, "server-duid"))) {
if (!*server_duid)
*server_duid = g_strdup(server_duid_tmp);
} else {
/* Inject server-duid into those ipv6 leases which
* didn't have it previously, for example, those
* created by leaseshelper from libvirt 1.2.6 */
if (virJSONValueObjectAppendString(lease_tmp, "server-duid", *server_duid) < 0)
return -1;
}
}
/* Move old lease to new array */
if (virJSONValueArrayAppend(leases_array_new, &lease_tmp) < 0) {
virReportError(VIR_ERR_INTERNAL_ERROR, "%s",
_("failed to create json"));
return -1;
}
ignore_value(virJSONValueArraySteal(leases_array, i));
}
return 0;
}
int
virLeasePrintLeases(virJSONValue *leases_array_new,
const char *server_duid)
{
virJSONValue *lease_tmp = NULL;
const char *ip_tmp = NULL;
long long expirytime = 0;
size_t i;
/* Man page of dnsmasq says: the script (helper program, in our case)
* should write the saved state of the lease database, in dnsmasq
* leasefile format, to stdout and exit with zero exit code, when
* called with argument init. Format:
* $expirytime $mac $ip $hostname $clientid # For all ipv4 leases
* duid $server-duid # If DHCPv6 is present
* $expirytime $iaid $ip $hostname $clientduid # For all ipv6 leases */
/* Traversing the ipv4 leases */
for (i = 0; i < virJSONValueArraySize(leases_array_new); i++) {
lease_tmp = virJSONValueArrayGet(leases_array_new, i);
if (!(ip_tmp = virJSONValueObjectGetString(lease_tmp, "ip-address"))) {
virReportError(VIR_ERR_INTERNAL_ERROR, "%s",
_("failed to parse json"));
return -1;
}
if (!strchr(ip_tmp, ':')) {
if (virJSONValueObjectGetNumberLong(lease_tmp, "expiry-time",
&expirytime) < 0)
continue;
printf("%lld %s %s %s %s\n",
expirytime,
virJSONValueObjectGetString(lease_tmp, "mac-address"),
virJSONValueObjectGetString(lease_tmp, "ip-address"),
NULLSTR_STAR(virJSONValueObjectGetString(lease_tmp, "hostname")),
NULLSTR_STAR(virJSONValueObjectGetString(lease_tmp, "client-id")));
}
}
/* Traversing the ipv6 leases */
if (server_duid) {
printf("duid %s\n", server_duid);
for (i = 0; i < virJSONValueArraySize(leases_array_new); i++) {
lease_tmp = virJSONValueArrayGet(leases_array_new, i);
if (!(ip_tmp = virJSONValueObjectGetString(lease_tmp, "ip-address"))) {
virReportError(VIR_ERR_INTERNAL_ERROR, "%s",
_("failed to parse json"));
return -1;
}
if (strchr(ip_tmp, ':')) {
if (virJSONValueObjectGetNumberLong(lease_tmp, "expiry-time",
&expirytime) < 0)
continue;
printf("%lld %s %s %s %s\n",
expirytime,
virJSONValueObjectGetString(lease_tmp, "iaid"),
virJSONValueObjectGetString(lease_tmp, "ip-address"),
NULLSTR_STAR(virJSONValueObjectGetString(lease_tmp, "hostname")),
NULLSTR_STAR(virJSONValueObjectGetString(lease_tmp, "client-id")));
}
}
}
return 0;
}
int
virLeaseNew(virJSONValue **lease_ret,
const char *mac,
const char *clientid,
const char *ip,
const char *hostname,
const char *iaid,
const char *server_duid)
{
g_autoptr(virJSONValue) lease_new = NULL;
const char *exptime_tmp = getenv("DNSMASQ_LEASE_EXPIRES");
long long expirytime = 0;
g_autofree char *exptime = NULL;
/* In case hostname is still unknown, use the last known one */
if (!hostname)
hostname = getenv("DNSMASQ_OLD_HOSTNAME");
if (!mac)
return 0;
if (exptime_tmp) {
exptime = g_strdup(exptime_tmp);
/* Removed extraneous trailing space in DNSMASQ_LEASE_EXPIRES
* (dnsmasq < 2.52) */
virTrimSpaces(exptime, NULL);
if (virStrToLong_ll(exptime, NULL, 10, &expirytime) < 0) {
virReportError(VIR_ERR_INTERNAL_ERROR,
_("Unable to convert lease expiry time to long long: %1$s"),
NULLSTR(exptime));
return -1;
}
}
/* Create new lease */
lease_new = virJSONValueNewObject();
if (iaid && virJSONValueObjectAppendString(lease_new, "iaid", iaid) < 0)
return -1;
if (ip && virJSONValueObjectAppendString(lease_new, "ip-address", ip) < 0)
return -1;
if (virJSONValueObjectAppendString(lease_new, "mac-address", mac) < 0)
return -1;
if (hostname && virJSONValueObjectAppendString(lease_new, "hostname", hostname) < 0)
return -1;
if (clientid && virJSONValueObjectAppendString(lease_new, "client-id", clientid) < 0)
return -1;
if (server_duid && virJSONValueObjectAppendString(lease_new, "server-duid", server_duid) < 0)
return -1;
if (virJSONValueObjectAppendNumberLong(lease_new, "expiry-time", expirytime) < 0)
return -1;
*lease_ret = g_steal_pointer(&lease_new);
return 0;
}
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