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/***
This file is part of systemd.
Copyright (C) 2013 Intel Corporation. All rights reserved.
Copyright (C) 2014 Tom Gundersen
systemd 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.
systemd 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 systemd; If not, see <http://www.gnu.org/licenses/>.
***/
#include <stdlib.h>
#include <errno.h>
#include <string.h>
#include <stdio.h>
#include <net/ethernet.h>
#include <sys/param.h>
#include "util.h"
#include "list.h"
#include "dhcp-protocol.h"
#include "dhcp-internal.h"
#include "dhcp-lease.h"
#include "sd-dhcp-client.h"
int sd_dhcp_lease_get_address(sd_dhcp_lease *lease, struct in_addr *addr) {
assert_return(lease, -EINVAL);
assert_return(addr, -EINVAL);
addr->s_addr = lease->address;
return 0;
}
int sd_dhcp_lease_get_mtu(sd_dhcp_lease *lease, uint16_t *mtu) {
assert_return(lease, -EINVAL);
assert_return(mtu, -EINVAL);
if (lease->mtu)
*mtu = lease->mtu;
else
return -ENOENT;
return 0;
}
int sd_dhcp_lease_get_dns(sd_dhcp_lease *lease, struct in_addr **addr, size_t *addr_size) {
assert_return(lease, -EINVAL);
assert_return(addr, -EINVAL);
assert_return(addr_size, -EINVAL);
if (lease->dns_size) {
*addr_size = lease->dns_size;
*addr = lease->dns;
} else
return -ENOENT;
return 0;
}
int sd_dhcp_lease_get_domainname(sd_dhcp_lease *lease, const char **domainname) {
assert_return(lease, -EINVAL);
assert_return(domainname, -EINVAL);
if (lease->domainname)
*domainname = lease->domainname;
else
return -ENOENT;
return 0;
}
int sd_dhcp_lease_get_hostname(sd_dhcp_lease *lease, const char **hostname) {
assert_return(lease, -EINVAL);
assert_return(hostname, -EINVAL);
if (lease->hostname)
*hostname = lease->hostname;
else
return -ENOENT;
return 0;
}
int sd_dhcp_lease_get_router(sd_dhcp_lease *lease, struct in_addr *addr) {
assert_return(lease, -EINVAL);
assert_return(addr, -EINVAL);
addr->s_addr = lease->router;
return 0;
}
int sd_dhcp_lease_get_netmask(sd_dhcp_lease *lease, struct in_addr *addr) {
assert_return(lease, -EINVAL);
assert_return(addr, -EINVAL);
addr->s_addr = lease->subnet_mask;
return 0;
}
sd_dhcp_lease *sd_dhcp_lease_ref(sd_dhcp_lease *lease) {
if (lease)
assert_se(REFCNT_INC(lease->n_ref) >= 2);
return lease;
}
sd_dhcp_lease *sd_dhcp_lease_unref(sd_dhcp_lease *lease) {
if (lease && REFCNT_DEC(lease->n_ref) <= 0) {
free(lease->hostname);
free(lease->domainname);
free(lease->dns);
free(lease);
}
return NULL;
}
int dhcp_lease_parse_options(uint8_t code, uint8_t len, const uint8_t *option,
void *user_data) {
sd_dhcp_lease *lease = user_data;
be32_t val;
switch(code) {
case DHCP_OPTION_IP_ADDRESS_LEASE_TIME:
if (len == 4) {
memcpy(&val, option, 4);
lease->lifetime = be32toh(val);
}
break;
case DHCP_OPTION_SERVER_IDENTIFIER:
if (len >= 4)
memcpy(&lease->server_address, option, 4);
break;
case DHCP_OPTION_SUBNET_MASK:
if (len >= 4)
memcpy(&lease->subnet_mask, option, 4);
break;
case DHCP_OPTION_ROUTER:
if (len >= 4)
memcpy(&lease->router, option, 4);
break;
case DHCP_OPTION_DOMAIN_NAME_SERVER:
if (len && !(len % 4)) {
unsigned i;
lease->dns_size = len / 4;
free(lease->dns);
lease->dns = new0(struct in_addr, lease->dns_size);
if (!lease->dns)
return -ENOMEM;
for (i = 0; i < lease->dns_size; i++) {
memcpy(&lease->dns[i].s_addr, option + 4 * i, 4);
}
}
break;
case DHCP_OPTION_INTERFACE_MTU:
if (len >= 2) {
be16_t mtu;
memcpy(&mtu, option, 2);
lease->mtu = be16toh(mtu);
if (lease->mtu < 68)
lease->mtu = 0;
}
break;
case DHCP_OPTION_DOMAIN_NAME:
if (len >= 1) {
free(lease->domainname);
lease->domainname = strndup((const char *)option, len);
}
break;
case DHCP_OPTION_HOST_NAME:
if (len >= 1) {
free(lease->hostname);
lease->hostname = strndup((const char *)option, len);
}
break;
case DHCP_OPTION_RENEWAL_T1_TIME:
if (len == 4) {
memcpy(&val, option, 4);
lease->t1 = be32toh(val);
}
break;
case DHCP_OPTION_REBINDING_T2_TIME:
if (len == 4) {
memcpy(&val, option, 4);
lease->t2 = be32toh(val);
}
break;
}
return 0;
}
int dhcp_lease_new(sd_dhcp_lease **ret) {
_cleanup_dhcp_lease_unref_ sd_dhcp_lease *lease = NULL;
lease = new0(sd_dhcp_lease, 1);
if (!lease)
return -ENOMEM;
lease->n_ref = REFCNT_INIT;
*ret = lease;
lease = NULL;
return 0;
}
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