This source file includes following definitions.
- sd_dhcp_server_set_lease_pool
- sd_dhcp_server_set_address
- sd_dhcp_server_is_running
- sd_dhcp_server_ref
- client_id_hash_func
- client_id_compare_func
- dhcp_lease_free
- sd_dhcp_server_unref
- sd_dhcp_server_new
- sd_dhcp_server_attach_event
- sd_dhcp_server_detach_event
- sd_dhcp_server_get_event
- sd_dhcp_server_stop
- dhcp_server_send_unicast_raw
- dhcp_server_send_udp
- requested_broadcast
- dhcp_server_send_packet
- server_message_init
- server_send_offer
- server_send_ack
- server_send_nak
- server_send_forcerenew
- parse_request
- dhcp_request_free
- ensure_sane_request
- get_pool_offset
- dhcp_server_handle_message
- server_receive_message
- sd_dhcp_server_start
- sd_dhcp_server_forcerenew
#include <sys/ioctl.h>
#include <netinet/if_ether.h>
#include "siphash24.h"
#include "sd-dhcp-server.h"
#include "dhcp-server-internal.h"
#include "dhcp-internal.h"
#define DHCP_DEFAULT_LEASE_TIME 3600
int sd_dhcp_server_set_lease_pool(sd_dhcp_server *server,
struct in_addr *address,
size_t size) {
assert_return(server, -EINVAL);
assert_return(address, -EINVAL);
assert_return(address->s_addr, -EINVAL);
assert_return(size, -EINVAL);
assert_return(server->pool_start == htobe32(INADDR_ANY), -EBUSY);
assert_return(!server->pool_size, -EBUSY);
assert_return(!server->bound_leases, -EBUSY);
server->bound_leases = new0(DHCPLease*, size);
if (!server->bound_leases)
return -ENOMEM;
server->pool_start = address->s_addr;
server->pool_size = size;
return 0;
}
int sd_dhcp_server_set_address(sd_dhcp_server *server, struct in_addr *address,
unsigned char prefixlen) {
assert_return(server, -EINVAL);
assert_return(address, -EINVAL);
assert_return(address->s_addr, -EINVAL);
assert_return(prefixlen <= 32, -ERANGE);
assert_return(server->address == htobe32(INADDR_ANY), -EBUSY);
assert_return(server->netmask == htobe32(INADDR_ANY), -EBUSY);
server->address = address->s_addr;
server->netmask = htobe32(0xfffffffflu << (32 - prefixlen));
return 0;
}
bool sd_dhcp_server_is_running(sd_dhcp_server *server) {
assert_return(server, -EINVAL);
return !!server->receive_message;
}
sd_dhcp_server *sd_dhcp_server_ref(sd_dhcp_server *server) {
if (server)
assert_se(REFCNT_INC(server->n_ref) >= 2);
return server;
}
unsigned long client_id_hash_func(const void *p,
const uint8_t hash_key[HASH_KEY_SIZE]) {
uint64_t u;
const DHCPClientId *id = p;
assert(id);
assert(id->length);
assert(id->data);
siphash24((uint8_t*) &u, id->data, id->length, hash_key);
return (unsigned long) u;
}
int client_id_compare_func(const void *_a, const void *_b) {
const DHCPClientId *a, *b;
a = _a;
b = _b;
assert(!a->length || a->data);
assert(!b->length || b->data);
if (a->length != b->length)
return a->length < b->length ? -1 : 1;
return memcmp(a->data, b->data, a->length);
}
static const struct hash_ops client_id_hash_ops = {
.hash = client_id_hash_func,
.compare = client_id_compare_func
};
static void dhcp_lease_free(DHCPLease *lease) {
if (!lease)
return;
free(lease->client_id.data);
free(lease);
}
sd_dhcp_server *sd_dhcp_server_unref(sd_dhcp_server *server) {
DHCPLease *lease;
if (!server)
return NULL;
if (REFCNT_DEC(server->n_ref) > 0)
return NULL;
log_dhcp_server(server, "UNREF");
sd_dhcp_server_stop(server);
sd_event_unref(server->event);
while ((lease = hashmap_steal_first(server->leases_by_client_id)))
dhcp_lease_free(lease);
hashmap_free(server->leases_by_client_id);
free(server->bound_leases);
free(server);
return NULL;
}
int sd_dhcp_server_new(sd_dhcp_server **ret, int ifindex) {
_cleanup_dhcp_server_unref_ sd_dhcp_server *server = NULL;
assert_return(ret, -EINVAL);
assert_return(ifindex > 0, -EINVAL);
server = new0(sd_dhcp_server, 1);
if (!server)
return -ENOMEM;
server->n_ref = REFCNT_INIT;
server->fd_raw = -1;
server->fd = -1;
server->address = htobe32(INADDR_ANY);
server->netmask = htobe32(INADDR_ANY);
server->index = ifindex;
server->leases_by_client_id = hashmap_new(&client_id_hash_ops);
*ret = server;
server = NULL;
return 0;
}
int sd_dhcp_server_attach_event(sd_dhcp_server *server, sd_event *event,
int priority) {
int r;
assert_return(server, -EINVAL);
assert_return(!server->event, -EBUSY);
if (event)
server->event = sd_event_ref(event);
else {
r = sd_event_default(&server->event);
if (r < 0)
return r;
}
server->event_priority = priority;
return 0;
}
int sd_dhcp_server_detach_event(sd_dhcp_server *server) {
assert_return(server, -EINVAL);
server->event = sd_event_unref(server->event);
return 0;
}
sd_event *sd_dhcp_server_get_event(sd_dhcp_server *server) {
assert_return(server, NULL);
return server->event;
}
int sd_dhcp_server_stop(sd_dhcp_server *server) {
assert_return(server, -EINVAL);
server->receive_message =
sd_event_source_unref(server->receive_message);
server->fd_raw = safe_close(server->fd_raw);
server->fd = safe_close(server->fd);
log_dhcp_server(server, "STOPPED");
return 0;
}
static int dhcp_server_send_unicast_raw(sd_dhcp_server *server,
DHCPPacket *packet, size_t len) {
union sockaddr_union link = {
.ll.sll_family = AF_PACKET,
.ll.sll_protocol = htons(ETH_P_IP),
.ll.sll_ifindex = server->index,
.ll.sll_halen = ETH_ALEN,
};
int r;
assert(server);
assert(server->index > 0);
assert(server->address);
assert(packet);
assert(len > sizeof(DHCPPacket));
memcpy(&link.ll.sll_addr, &packet->dhcp.chaddr, ETH_ALEN);
dhcp_packet_append_ip_headers(packet, server->address, DHCP_PORT_SERVER,
packet->dhcp.yiaddr,
DHCP_PORT_CLIENT, len);
r = dhcp_network_send_raw_socket(server->fd_raw, &link, packet, len);
if (r < 0)
return r;
return 0;
}
static int dhcp_server_send_udp(sd_dhcp_server *server, be32_t destination,
DHCPMessage *message, size_t len) {
union sockaddr_union dest = {
.in.sin_family = AF_INET,
.in.sin_port = htobe16(DHCP_PORT_CLIENT),
.in.sin_addr.s_addr = destination,
};
struct iovec iov = {
.iov_base = message,
.iov_len = len,
};
uint8_t cmsgbuf[CMSG_LEN(sizeof(struct in_pktinfo))] = {};
struct msghdr msg = {
.msg_name = &dest,
.msg_namelen = sizeof(dest.in),
.msg_iov = &iov,
.msg_iovlen = 1,
.msg_control = cmsgbuf,
.msg_controllen = sizeof(cmsgbuf),
};
struct cmsghdr *cmsg;
struct in_pktinfo *pktinfo;
int r;
assert(server);
assert(server->fd > 0);
assert(message);
assert(len > sizeof(DHCPMessage));
cmsg = CMSG_FIRSTHDR(&msg);
assert(cmsg);
cmsg->cmsg_level = IPPROTO_IP;
cmsg->cmsg_type = IP_PKTINFO;
cmsg->cmsg_len = CMSG_LEN(sizeof(struct in_pktinfo));
pktinfo = (struct in_pktinfo*) CMSG_DATA(cmsg);
assert(pktinfo);
pktinfo->ipi_ifindex = server->index;
pktinfo->ipi_spec_dst.s_addr = server->address;
r = sendmsg(server->fd, &msg, 0);
if (r < 0)
return -errno;
return 0;
}
static bool requested_broadcast(DHCPRequest *req) {
assert(req);
return req->message->flags & htobe16(0x8000);
}
int dhcp_server_send_packet(sd_dhcp_server *server,
DHCPRequest *req, DHCPPacket *packet,
int type, size_t optoffset) {
be32_t destination = INADDR_ANY;
int r;
assert(server);
assert(req);
assert(req->max_optlen);
assert(optoffset <= req->max_optlen);
assert(packet);
r = dhcp_option_append(&packet->dhcp, req->max_optlen, &optoffset, 0,
DHCP_OPTION_SERVER_IDENTIFIER,
4, &server->address);
if (r < 0)
return r;
r = dhcp_option_append(&packet->dhcp, req->max_optlen, &optoffset, 0,
DHCP_OPTION_END, 0, NULL);
if (r < 0)
return r;
if (req->message->giaddr) {
destination = req->message->giaddr;
if (type == DHCP_NAK)
packet->dhcp.flags = htobe16(0x8000);
} else if (req->message->ciaddr && type != DHCP_NAK)
destination = req->message->ciaddr;
if (destination != INADDR_ANY)
return dhcp_server_send_udp(server, destination, &packet->dhcp,
sizeof(DHCPMessage) + optoffset);
else if (requested_broadcast(req) || type == DHCP_NAK)
return dhcp_server_send_udp(server, INADDR_BROADCAST,
&packet->dhcp,
sizeof(DHCPMessage) + optoffset);
else
return dhcp_server_send_unicast_raw(server, packet,
sizeof(DHCPPacket) + optoffset);
}
static int server_message_init(sd_dhcp_server *server, DHCPPacket **ret,
uint8_t type, size_t *_optoffset,
DHCPRequest *req) {
_cleanup_free_ DHCPPacket *packet = NULL;
size_t optoffset = 0;
int r;
assert(server);
assert(ret);
assert(_optoffset);
assert(IN_SET(type, DHCP_OFFER, DHCP_ACK, DHCP_NAK));
packet = malloc0(sizeof(DHCPPacket) + req->max_optlen);
if (!packet)
return -ENOMEM;
r = dhcp_message_init(&packet->dhcp, BOOTREPLY,
be32toh(req->message->xid), type, ARPHRD_ETHER,
req->max_optlen, &optoffset);
if (r < 0)
return r;
packet->dhcp.flags = req->message->flags;
packet->dhcp.giaddr = req->message->giaddr;
memcpy(&packet->dhcp.chaddr, &req->message->chaddr, ETH_ALEN);
*_optoffset = optoffset;
*ret = packet;
packet = NULL;
return 0;
}
static int server_send_offer(sd_dhcp_server *server, DHCPRequest *req,
be32_t address) {
_cleanup_free_ DHCPPacket *packet = NULL;
size_t offset;
be32_t lease_time;
int r;
r = server_message_init(server, &packet, DHCP_OFFER, &offset, req);
if (r < 0)
return r;
packet->dhcp.yiaddr = address;
lease_time = htobe32(req->lifetime);
r = dhcp_option_append(&packet->dhcp, req->max_optlen, &offset, 0,
DHCP_OPTION_IP_ADDRESS_LEASE_TIME, 4,
&lease_time);
if (r < 0)
return r;
r = dhcp_option_append(&packet->dhcp, req->max_optlen, &offset, 0,
DHCP_OPTION_SUBNET_MASK, 4, &server->netmask);
if (r < 0)
return r;
r = dhcp_option_append(&packet->dhcp, req->max_optlen, &offset, 0,
DHCP_OPTION_ROUTER, 4, &server->address);
if (r < 0)
return r;
r = dhcp_server_send_packet(server, req, packet, DHCP_OFFER, offset);
if (r < 0)
return r;
return 0;
}
static int server_send_ack(sd_dhcp_server *server, DHCPRequest *req,
be32_t address) {
_cleanup_free_ DHCPPacket *packet = NULL;
size_t offset;
be32_t lease_time;
int r;
r = server_message_init(server, &packet, DHCP_ACK, &offset, req);
if (r < 0)
return r;
packet->dhcp.yiaddr = address;
lease_time = htobe32(req->lifetime);
r = dhcp_option_append(&packet->dhcp, req->max_optlen, &offset, 0,
DHCP_OPTION_IP_ADDRESS_LEASE_TIME, 4,
&lease_time);
if (r < 0)
return r;
r = dhcp_option_append(&packet->dhcp, req->max_optlen, &offset, 0,
DHCP_OPTION_SUBNET_MASK, 4, &server->netmask);
if (r < 0)
return r;
r = dhcp_option_append(&packet->dhcp, req->max_optlen, &offset, 0,
DHCP_OPTION_ROUTER, 4, &server->address);
if (r < 0)
return r;
r = dhcp_server_send_packet(server, req, packet, DHCP_ACK, offset);
if (r < 0)
return r;
return 0;
}
static int server_send_nak(sd_dhcp_server *server, DHCPRequest *req) {
_cleanup_free_ DHCPPacket *packet = NULL;
size_t offset;
int r;
r = server_message_init(server, &packet, DHCP_NAK, &offset, req);
if (r < 0)
return r;
r = dhcp_server_send_packet(server, req, packet, DHCP_NAK, offset);
if (r < 0)
return r;
return 0;
}
static int server_send_forcerenew(sd_dhcp_server *server, be32_t address,
be32_t gateway, uint8_t chaddr[]) {
_cleanup_free_ DHCPPacket *packet = NULL;
size_t optoffset = 0;
int r;
assert(server);
assert(address != INADDR_ANY);
assert(chaddr);
packet = malloc0(sizeof(DHCPPacket) + DHCP_MIN_OPTIONS_SIZE);
if (!packet)
return -ENOMEM;
r = dhcp_message_init(&packet->dhcp, BOOTREPLY, 0,
DHCP_FORCERENEW, ARPHRD_ETHER,
DHCP_MIN_OPTIONS_SIZE, &optoffset);
if (r < 0)
return r;
r = dhcp_option_append(&packet->dhcp, DHCP_MIN_OPTIONS_SIZE,
&optoffset, 0, DHCP_OPTION_END, 0, NULL);
if (r < 0)
return r;
memcpy(&packet->dhcp.chaddr, chaddr, ETH_ALEN);
r = dhcp_server_send_udp(server, address, &packet->dhcp,
sizeof(DHCPMessage) + optoffset);
if (r < 0)
return r;
return 0;
}
static int parse_request(uint8_t code, uint8_t len, const uint8_t *option,
void *user_data) {
DHCPRequest *req = user_data;
assert(req);
switch(code) {
case DHCP_OPTION_IP_ADDRESS_LEASE_TIME:
if (len == 4)
req->lifetime = be32toh(*(be32_t*)option);
break;
case DHCP_OPTION_REQUESTED_IP_ADDRESS:
if (len == 4)
req->requested_ip = *(be32_t*)option;
break;
case DHCP_OPTION_SERVER_IDENTIFIER:
if (len == 4)
req->server_id = *(be32_t*)option;
break;
case DHCP_OPTION_CLIENT_IDENTIFIER:
if (len >= 2) {
uint8_t *data;
data = memdup(option, len);
if (!data)
return -ENOMEM;
free(req->client_id.data);
req->client_id.data = data;
req->client_id.length = len;
}
break;
case DHCP_OPTION_MAXIMUM_MESSAGE_SIZE:
if (len == 2)
req->max_optlen = be16toh(*(be16_t*)option) -
- sizeof(DHCPPacket);
break;
}
return 0;
}
static void dhcp_request_free(DHCPRequest *req) {
if (!req)
return;
free(req->client_id.data);
free(req);
}
DEFINE_TRIVIAL_CLEANUP_FUNC(DHCPRequest*, dhcp_request_free);
#define _cleanup_dhcp_request_free_ _cleanup_(dhcp_request_freep)
static int ensure_sane_request(DHCPRequest *req, DHCPMessage *message) {
assert(req);
assert(message);
req->message = message;
if (!req->client_id.data) {
uint8_t *data;
data = new0(uint8_t, ETH_ALEN + 1);
if (!data)
return -ENOMEM;
req->client_id.length = ETH_ALEN + 1;
req->client_id.data = data;
req->client_id.data[0] = 0x01;
memcpy(&req->client_id.data[1], &message->chaddr, ETH_ALEN);
}
if (req->max_optlen < DHCP_MIN_OPTIONS_SIZE)
req->max_optlen = DHCP_MIN_OPTIONS_SIZE;
if (!req->lifetime)
req->lifetime = DHCP_DEFAULT_LEASE_TIME;
return 0;
}
static int get_pool_offset(sd_dhcp_server *server, be32_t requested_ip) {
assert(server);
if (!server->pool_size)
return -EINVAL;
if (be32toh(requested_ip) < be32toh(server->pool_start) ||
be32toh(requested_ip) >= be32toh(server->pool_start) +
+ server->pool_size)
return -EINVAL;
return be32toh(requested_ip) - be32toh(server->pool_start);
}
int dhcp_server_handle_message(sd_dhcp_server *server, DHCPMessage *message,
size_t length) {
_cleanup_dhcp_request_free_ DHCPRequest *req = NULL;
DHCPLease *existing_lease;
int type, r;
assert(server);
assert(message);
if (message->op != BOOTREQUEST ||
message->htype != ARPHRD_ETHER ||
message->hlen != ETHER_ADDR_LEN)
return 0;
req = new0(DHCPRequest, 1);
if (!req)
return -ENOMEM;
type = dhcp_option_parse(message, length, parse_request, req);
if (type < 0)
return 0;
r = ensure_sane_request(req, message);
if (r < 0)
return r;
existing_lease = hashmap_get(server->leases_by_client_id,
&req->client_id);
switch(type) {
case DHCP_DISCOVER:
{
be32_t address = INADDR_ANY;
unsigned i;
log_dhcp_server(server, "DISCOVER (0x%x)",
be32toh(req->message->xid));
if (!server->pool_size)
return 0;
if (existing_lease)
address = existing_lease->address;
else {
for (i = 0; i < server->pool_size; i++) {
if (!server->bound_leases[server->next_offer]) {
address = htobe32(be32toh(server->pool_start) + server->next_offer);
break;
} else
server->next_offer = (server->next_offer + 1) % server->pool_size;
}
}
if (address == INADDR_ANY)
return 0;
r = server_send_offer(server, req, address);
if (r < 0) {
log_dhcp_server(server, "could not send offer: %s",
strerror(-r));
return r;
} else {
log_dhcp_server(server, "OFFER (0x%x)",
be32toh(req->message->xid));
return DHCP_OFFER;
}
break;
}
case DHCP_DECLINE:
log_dhcp_server(server, "DECLINE (0x%x)",
be32toh(req->message->xid));
return 1;
break;
case DHCP_REQUEST:
{
be32_t address;
bool init_reboot = false;
int pool_offset;
if (req->server_id) {
log_dhcp_server(server, "REQUEST (selecting) (0x%x)",
be32toh(req->message->xid));
if (req->server_id != server->address)
return 0;
if (req->message->ciaddr)
return 0;
if (!req->requested_ip)
return 0;
address = req->requested_ip;
} else if (req->requested_ip) {
log_dhcp_server(server, "REQUEST (init-reboot) (0x%x)",
be32toh(req->message->xid));
if (req->message->ciaddr)
return 0;
address = req->requested_ip;
init_reboot = true;
} else {
log_dhcp_server(server, "REQUEST (rebinding/renewing) (0x%x)",
be32toh(req->message->xid));
if (!req->message->ciaddr)
return 0;
address = req->message->ciaddr;
}
pool_offset = get_pool_offset(server, address);
if (pool_offset >= 0 &&
server->bound_leases[pool_offset] == existing_lease) {
DHCPLease *lease;
usec_t time_now;
if (!existing_lease) {
lease = new0(DHCPLease, 1);
lease->address = req->requested_ip;
lease->client_id.data = memdup(req->client_id.data,
req->client_id.length);
if (!lease->client_id.data) {
free(lease);
return -ENOMEM;
}
lease->client_id.length = req->client_id.length;
memcpy(&lease->chaddr, &req->message->chaddr,
ETH_ALEN);
lease->gateway = req->message->giaddr;
} else
lease = existing_lease;
r = sd_event_now(server->event,
clock_boottime_or_monotonic(),
&time_now);
if (r < 0)
time_now = now(clock_boottime_or_monotonic());
lease->expiration = req->lifetime * USEC_PER_SEC + time_now;
r = server_send_ack(server, req, address);
if (r < 0) {
log_dhcp_server(server, "could not send ack: %s",
strerror(-r));
if (!existing_lease)
dhcp_lease_free(lease);
return r;
} else {
log_dhcp_server(server, "ACK (0x%x)",
be32toh(req->message->xid));
server->bound_leases[pool_offset] = lease;
hashmap_put(server->leases_by_client_id,
&lease->client_id, lease);
return DHCP_ACK;
}
} else if (init_reboot) {
r = server_send_nak(server, req);
if (r < 0) {
log_dhcp_server(server, "could not send nak: %s",
strerror(-r));
return r;
} else {
log_dhcp_server(server, "NAK (0x%x)",
be32toh(req->message->xid));
return DHCP_NAK;
}
}
break;
}
case DHCP_RELEASE: {
int pool_offset;
log_dhcp_server(server, "RELEASE (0x%x)",
be32toh(req->message->xid));
if (!existing_lease)
return 0;
if (existing_lease->address != req->message->ciaddr)
return 0;
pool_offset = get_pool_offset(server, req->message->ciaddr);
if (pool_offset < 0)
return 0;
if (server->bound_leases[pool_offset] == existing_lease) {
server->bound_leases[pool_offset] = NULL;
hashmap_remove(server->leases_by_client_id, existing_lease);
dhcp_lease_free(existing_lease);
return 1;
} else
return 0;
}
}
return 0;
}
static int server_receive_message(sd_event_source *s, int fd,
uint32_t revents, void *userdata) {
_cleanup_free_ DHCPMessage *message = NULL;
uint8_t cmsgbuf[CMSG_LEN(sizeof(struct in_pktinfo))];
sd_dhcp_server *server = userdata;
struct iovec iov = {};
struct msghdr msg = {
.msg_iov = &iov,
.msg_iovlen = 1,
.msg_control = cmsgbuf,
.msg_controllen = sizeof(cmsgbuf),
};
struct cmsghdr *cmsg;
int buflen = 0, len, r;
assert(server);
r = ioctl(fd, FIONREAD, &buflen);
if (r < 0)
return r;
if (buflen < 0)
return -EIO;
message = malloc0(buflen);
if (!message)
return -ENOMEM;
iov.iov_base = message;
iov.iov_len = buflen;
len = recvmsg(fd, &msg, 0);
if (len < buflen)
return 0;
else if ((size_t)len < sizeof(DHCPMessage))
return 0;
for (cmsg = CMSG_FIRSTHDR(&msg); cmsg; cmsg = CMSG_NXTHDR(&msg, cmsg)) {
if (cmsg->cmsg_level == IPPROTO_IP &&
cmsg->cmsg_type == IP_PKTINFO &&
cmsg->cmsg_len == CMSG_LEN(sizeof(struct in_pktinfo))) {
struct in_pktinfo *info = (struct in_pktinfo*)CMSG_DATA(cmsg);
if (server->index != info->ipi_ifindex)
return 0;
break;
}
}
return dhcp_server_handle_message(server, message, (size_t)len);
}
int sd_dhcp_server_start(sd_dhcp_server *server) {
int r;
assert_return(server, -EINVAL);
assert_return(server->event, -EINVAL);
assert_return(!server->receive_message, -EBUSY);
assert_return(server->fd_raw == -1, -EBUSY);
assert_return(server->fd == -1, -EBUSY);
assert_return(server->address != htobe32(INADDR_ANY), -EUNATCH);
r = socket(AF_PACKET, SOCK_DGRAM | SOCK_NONBLOCK, 0);
if (r < 0) {
r = -errno;
sd_dhcp_server_stop(server);
return r;
}
server->fd_raw = r;
r = dhcp_network_bind_udp_socket(INADDR_ANY, DHCP_PORT_SERVER);
if (r < 0) {
sd_dhcp_server_stop(server);
return r;
}
server->fd = r;
r = sd_event_add_io(server->event, &server->receive_message,
server->fd, EPOLLIN,
server_receive_message, server);
if (r < 0) {
sd_dhcp_server_stop(server);
return r;
}
r = sd_event_source_set_priority(server->receive_message,
server->event_priority);
if (r < 0) {
sd_dhcp_server_stop(server);
return r;
}
log_dhcp_server(server, "STARTED");
return 0;
}
int sd_dhcp_server_forcerenew(sd_dhcp_server *server) {
unsigned i;
int r = 0;
assert_return(server, -EINVAL);
assert(server->bound_leases);
for (i = 0; i < server->pool_size; i++) {
DHCPLease *lease = server->bound_leases[i];
if (!lease)
continue;
r = server_send_forcerenew(server, lease->address,
lease->gateway,
lease->chaddr);
if (r < 0)
return r;
else
log_dhcp_server(server, "FORCERENEW");
}
return r;
}