/**
* Copyright (C) 2012-2013 Steven Barth <steven@midlink.org>
+ * Copyright (C) 2016 Hans Dedecker <dedeckeh@gmail.com>
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License v2 as published by
#include <sys/timerfd.h>
#include <arpa/inet.h>
+#include <libubox/md5.h>
+
#include "odhcpd.h"
#include "dhcpv4.h"
#include "dhcpv6.h"
-
+static void dhcpv4_netevent_cb(unsigned long event, struct netevent_handler_info *info);
+static int setup_dhcpv4_addresses(struct interface *iface);
+static void update_static_assignments(struct interface *iface);
+static void valid_until_cb(struct uloop_timeout *event);
+static void handle_addrlist_change(struct interface *iface);
+static void free_dhcpv4_assignment(struct dhcpv4_assignment *a);
+static void dhcpv4_fr_start(struct dhcpv4_assignment *a);
+static void dhcpv4_fr_stop(struct dhcpv4_assignment *a);
static void handle_dhcpv4(void *addr, void *data, size_t len,
struct interface *iface, void *dest_addr);
static struct dhcpv4_assignment* dhcpv4_lease(struct interface *iface,
- enum dhcpv4_msg msg, const uint8_t *mac, struct in_addr reqaddr,
- const char *hostname);
-
-// Create socket and register events
-int init_dhcpv4(void)
+ enum dhcpv4_msg msg, const uint8_t *mac, const uint32_t reqaddr,
+ uint32_t *leasetime, const char *hostname, const size_t hostname_len,
+ const bool accept_fr_nonce, bool *incl_fr_opt, uint32_t *fr_serverid);
+
+static struct netevent_handler dhcpv4_netevent_handler = { .cb = dhcpv4_netevent_cb, };
+static struct uloop_timeout valid_until_timeout = {.cb = valid_until_cb};
+static uint32_t serial = 0;
+
+struct odhcpd_ref_ip {
+ struct list_head head;
+ int ref_cnt;
+ struct odhcpd_ipaddr addr;
+};
+
+/* Create socket and register events */
+int dhcpv4_init(void)
{
- return 0;
-}
+ uloop_timeout_set(&valid_until_timeout, 1000);
+ netlink_add_netevent_handler(&dhcpv4_netevent_handler);
-char *dhcpv4_msg_to_string(uint8_t reqmsg)
-{
- switch (reqmsg) {
- case (DHCPV4_MSG_DISCOVER):
- return "DHCPV4_MSG_DISCOVER";
- case (DHCPV4_MSG_OFFER):
- return "DHCPV4_MSG_OFFER";
- case (DHCPV4_MSG_REQUEST):
- return "DHCPV4_MSG_REQUEST";
- case (DHCPV4_MSG_DECLINE):
- return "DHCPV4_MSG_DECLINE";
- case (DHCPV4_MSG_ACK):
- return "DHCPV4_MSG_ACK";
- case (DHCPV4_MSG_NAK):
- return "DHCPV4_MSG_NAK";
- case (DHCPV4_MSG_RELEASE):
- return "DHCPV4_MSG_RELEASE";
- case (DHCPV4_MSG_INFORM):
- return "DHCPV4_MSG_INFORM";
- default:
- return "UNKNOWN";
- }
+ return 0;
}
-int setup_dhcpv4_interface(struct interface *iface, bool enable)
+int dhcpv4_setup_interface(struct interface *iface, bool enable)
{
if (iface->dhcpv4_event.uloop.fd > 0) {
uloop_fd_delete(&iface->dhcpv4_event.uloop);
if (!iface->dhcpv4_assignments.next)
INIT_LIST_HEAD(&iface->dhcpv4_assignments);
+ if (!iface->dhcpv4_fr_ips.next)
+ INIT_LIST_HEAD(&iface->dhcpv4_fr_ips);
+
int sock = socket(AF_INET, SOCK_DGRAM | SOCK_CLOEXEC, IPPROTO_UDP);
if (sock < 0) {
- syslog(LOG_ERR, "Failed to create DHCPv4 server socket: %s",
- strerror(errno));
+ syslog(LOG_ERR, "Failed to create DHCPv4 server socket: %m");
return -1;
}
- // Basic IPv6 configuration
+ /* Basic IPv4 configuration */
int val = 1;
setsockopt(sock, SOL_SOCKET, SO_REUSEADDR, &val, sizeof(val));
setsockopt(sock, SOL_SOCKET, SO_BROADCAST, &val, sizeof(val));
{INADDR_ANY}, {0}};
if (bind(sock, (struct sockaddr*)&bind_addr, sizeof(bind_addr))) {
- syslog(LOG_ERR, "Failed to open DHCPv4 server socket: %s",
- strerror(errno));
+ syslog(LOG_ERR, "Failed to open DHCPv4 server socket: %m");
return -1;
}
+ iface->dhcpv4_event.uloop.fd = sock;
+ iface->dhcpv4_event.handle_dgram = handle_dhcpv4;
+ odhcpd_register(&iface->dhcpv4_event);
- if (ntohl(iface->dhcpv4_start.s_addr) > ntohl(iface->dhcpv4_end.s_addr)) {
- syslog(LOG_ERR, "Invalid DHCP range");
+ if (setup_dhcpv4_addresses(iface) < 0)
return -1;
+
+ update_static_assignments(iface);
+ } else if (iface->dhcpv4_assignments.next) {
+ while (!list_empty(&iface->dhcpv4_assignments))
+ free_dhcpv4_assignment(list_first_entry(&iface->dhcpv4_assignments,
+ struct dhcpv4_assignment, head));
+ }
+ return 0;
+}
+
+
+static void dhcpv4_netevent_cb(unsigned long event, struct netevent_handler_info *info)
+{
+ struct interface *iface = info->iface;
+
+ if (!iface || iface->dhcpv4 == MODE_DISABLED)
+ return;
+
+ switch (event) {
+ case NETEV_IFINDEX_CHANGE:
+ dhcpv4_setup_interface(iface, true);
+ break;
+ case NETEV_ADDRLIST_CHANGE:
+ handle_addrlist_change(iface);
+ break;
+ default:
+ break;
+ }
+}
+
+static struct dhcpv4_assignment *find_assignment_by_hwaddr(struct interface *iface, const uint8_t *hwaddr)
+{
+ struct dhcpv4_assignment *a;
+
+ list_for_each_entry(a, &iface->dhcpv4_assignments, head)
+ if (!memcmp(a->hwaddr, hwaddr, 6))
+ return a;
+
+ return NULL;
+}
+
+static struct dhcpv4_assignment *find_assignment_by_addr(struct interface *iface, const uint32_t addr)
+{
+ struct dhcpv4_assignment *a;
+
+ list_for_each_entry(a, &iface->dhcpv4_assignments, head)
+ if (a->addr == addr)
+ return a;
+
+ return NULL;
+}
+
+static int setup_dhcpv4_addresses(struct interface *iface)
+{
+ iface->dhcpv4_start_ip.s_addr = INADDR_ANY;
+ iface->dhcpv4_end_ip.s_addr = INADDR_ANY;
+ iface->dhcpv4_local.s_addr = INADDR_ANY;
+ iface->dhcpv4_bcast.s_addr = INADDR_ANY;
+ iface->dhcpv4_mask.s_addr = INADDR_ANY;
+
+ /* Sanity checks */
+ if (iface->dhcpv4_start.s_addr & htonl(0xffff0000) ||
+ iface->dhcpv4_end.s_addr & htonl(0xffff0000) ||
+ ntohl(iface->dhcpv4_start.s_addr) > ntohl(iface->dhcpv4_end.s_addr)) {
+ syslog(LOG_ERR, "invalid DHCP range for %s", iface->name);
+ return -1;
+ }
+
+ if (!iface->addr4_len) {
+ syslog(LOG_WARNING, "no network(s) available on %s", iface->name);
+ return -1;
+ }
+
+ uint32_t start = ntohl(iface->dhcpv4_start.s_addr);
+ uint32_t end = ntohl(iface->dhcpv4_end.s_addr);
+
+ for (size_t i = 0; i < iface->addr4_len && start && end; i++) {
+ struct in_addr *addr = &iface->addr4[i].addr.in;
+ struct in_addr mask;
+
+ odhcpd_bitlen2netmask(false, iface->addr4[i].prefix, &mask);
+ if ((start & ntohl(~mask.s_addr)) == start &&
+ (end & ntohl(~mask.s_addr)) == end) {
+ iface->dhcpv4_start_ip.s_addr = htonl(start) |
+ (addr->s_addr & mask.s_addr);
+ iface->dhcpv4_end_ip.s_addr = htonl(end) |
+ (addr->s_addr & mask.s_addr);
+ iface->dhcpv4_local = *addr;
+ iface->dhcpv4_bcast = iface->addr4[i].broadcast;
+ iface->dhcpv4_mask = mask;
+ return 0;
}
+ }
- // Create a range if not specified
- struct ifreq ifreq;
- strncpy(ifreq.ifr_name, iface->ifname, sizeof(ifreq.ifr_name));
-
- struct sockaddr_in *saddr = (struct sockaddr_in*)&ifreq.ifr_addr;
- struct sockaddr_in *smask = (struct sockaddr_in*)&ifreq.ifr_netmask;
- if (!(iface->dhcpv4_start.s_addr & htonl(0xffff0000)) &&
- !(iface->dhcpv4_end.s_addr & htonl(0xffff0000)) &&
- !ioctl(sock, SIOCGIFADDR, &ifreq)) {
- struct in_addr addr = saddr->sin_addr;
-
- ioctl(sock, SIOCGIFNETMASK, &ifreq);
- struct in_addr mask = smask->sin_addr;
-
- uint32_t start = ntohl(iface->dhcpv4_start.s_addr);
- uint32_t end = ntohl(iface->dhcpv4_end.s_addr);
-
- if (start && end && start < end &&
- start > ntohl(addr.s_addr & ~mask.s_addr) &&
- (start & ntohl(~mask.s_addr)) == start &&
- (end & ntohl(~mask.s_addr)) == end) {
- iface->dhcpv4_start.s_addr = htonl(start) |
- (addr.s_addr & mask.s_addr);
- iface->dhcpv4_end.s_addr = htonl(end) |
- (addr.s_addr & mask.s_addr);
- } else if (ntohl(mask.s_addr) <= 0xfffffff0) {
- start = addr.s_addr & mask.s_addr;
- end = addr.s_addr & mask.s_addr;
-
- if (ntohl(mask.s_addr) <= 0xffffff00) {
- iface->dhcpv4_start.s_addr = start | htonl(100);
- iface->dhcpv4_end.s_addr = end | htonl(250);
- } else if (ntohl(mask.s_addr) <= 0xffffffc0) {
- iface->dhcpv4_start.s_addr = start | htonl(10);
- iface->dhcpv4_end.s_addr = end | htonl(60);
- } else if (ntohl(mask.s_addr) <= 0xffffffe0) {
- iface->dhcpv4_start.s_addr = start | htonl(10);
- iface->dhcpv4_end.s_addr = end | htonl(30);
- } else {
- iface->dhcpv4_start.s_addr = start | htonl(3);
- iface->dhcpv4_end.s_addr = end | htonl(12);
- }
- }
+ /* Don't allocate IP range for subnets bigger than 28 */
+ if (iface->addr4[0].prefix > 28) {
+ syslog(LOG_WARNING, "auto allocation of DHCP range fails on %s", iface->name);
+ return -1;
+ }
+ iface->dhcpv4_local = iface->addr4[0].addr.in;
+ iface->dhcpv4_bcast = iface->addr4[0].broadcast;
+ odhcpd_bitlen2netmask(false, iface->addr4[0].prefix, &iface->dhcpv4_mask);
+ end = start = iface->dhcpv4_local.s_addr & iface->dhcpv4_mask.s_addr;
+
+ /* Auto allocate ranges */
+ if (ntohl(iface->dhcpv4_mask.s_addr) <= 0xffffff00) {
+ iface->dhcpv4_start_ip.s_addr = start | htonl(100);
+ iface->dhcpv4_end_ip.s_addr = end | htonl(250);
+ } else if (ntohl(iface->dhcpv4_mask.s_addr) <= 0xffffffc0) {
+ iface->dhcpv4_start_ip.s_addr = start | htonl(10);
+ iface->dhcpv4_end_ip.s_addr = end | htonl(60);
+ } else if (ntohl(iface->dhcpv4_mask.s_addr) <= 0xffffffe0) {
+ iface->dhcpv4_start_ip.s_addr = start | htonl(10);
+ iface->dhcpv4_end_ip.s_addr = end | htonl(30);
+ } else {
+ iface->dhcpv4_start_ip.s_addr = start | htonl(3);
+ iface->dhcpv4_end_ip.s_addr = end | htonl(12);
+ }
+
+ return 0;
+}
+
+static void update_static_assignments(struct interface *iface)
+{
+ struct dhcpv4_assignment *a, *c;
+
+ /* Cleanup static entries not belonging to the network */
+ list_for_each_entry_safe(a, c, &iface->dhcpv4_assignments, head) {
+ if ((a->flags & OAF_STATIC) &&
+ ((a->addr & iface->dhcpv4_mask.s_addr) !=
+ (iface->dhcpv4_start.s_addr & iface->dhcpv4_mask.s_addr)))
+ free_dhcpv4_assignment(a);
+ }
+ /* Parse static entries */
+ struct lease *lease;
+ list_for_each_entry(lease, &leases, head) {
+ if ((iface->dhcpv4_start_ip.s_addr & iface->dhcpv4_mask.s_addr) !=
+ (lease->ipaddr.s_addr & iface->dhcpv4_mask.s_addr)) {
+ continue;
}
- // Parse static entries
- struct lease *lease;
- list_for_each_entry(lease, &leases, head) {
- // Construct entry
- size_t hostlen = strlen(lease->hostname) + 1;
- struct dhcpv4_assignment *a = calloc(1, sizeof(*a) + hostlen);
+ a = find_assignment_by_hwaddr(iface, lease->mac.ether_addr_octet);
+
+ if (!a) {
+ /* Check if there's an assignment with the specified IP address */
+ if (find_assignment_by_addr(iface, lease->ipaddr.s_addr))
+ continue;
+
+ /* Construct entry */
+ a = calloc(1, sizeof(*a));
if (!a) {
syslog(LOG_ERR, "Calloc failed for static lease on interface %s",
iface->ifname);
- return -1;
+ continue;
}
- a->addr = ntohl(lease->ipaddr.s_addr);
memcpy(a->hwaddr, lease->mac.ether_addr_octet, sizeof(a->hwaddr));
- memcpy(a->hostname, lease->hostname, hostlen);
- a->valid_until = LONG_MAX;
-
- // Assign to all interfaces
- struct dhcpv4_assignment *c;
- list_for_each_entry(c, &iface->dhcpv4_assignments, head) {
- if (c->addr > a->addr) {
- list_add_tail(&a->head, &c->head);
- break;
- } else if (c->addr == a->addr) {
- // Already an assignment with that number
- break;
- }
- }
- if (&c->head == &iface->dhcpv4_assignments) {
- list_add(&a->head, &iface->dhcpv4_assignments);
+ }
+
+ a->leasetime = lease->dhcpv4_leasetime;
+
+ a->addr = lease->ipaddr.s_addr;
+ /* Static assignment */
+ a->flags |= OAF_STATIC;
+ /* Infinite valid */
+ a->valid_until = 0;
+ a->iface = iface;
+ if (lease->hostname[0]) {
+ free(a->hostname);
+ a->hostname = strdup(lease->hostname);
+ }
+
+ /* Assign to all interfaces */
+ list_for_each_entry(c, &iface->dhcpv4_assignments, head) {
+ if (ntohl(c->addr) > ntohl(a->addr)) {
+ list_add_tail(&a->head, &c->head);
+ break;
}
+ }
+
+ if (&c->head == &iface->dhcpv4_assignments)
+ list_add(&a->head, &iface->dhcpv4_assignments);
+ }
+}
+
+static void inc_ref_cnt_ip(struct odhcpd_ref_ip **ptr, struct odhcpd_ref_ip *ip)
+{
+ *ptr = ip;
+ ip->ref_cnt++;
+}
+
+static void decr_ref_cnt_ip(struct odhcpd_ref_ip **ptr, struct interface *iface)
+{
+ struct odhcpd_ref_ip *ip = *ptr;
- if (!a->head.next)
- free(a);
+ if (--ip->ref_cnt == 0) {
+ netlink_setup_addr(&ip->addr, iface->ifindex, false, false);
+
+ list_del(&ip->head);
+ free(ip);
+ }
+
+ *ptr = NULL;
+}
+
+static bool leases_require_fr(struct interface *iface, struct odhcpd_ipaddr *addr,
+ uint32_t mask)
+{
+ struct dhcpv4_assignment *a = NULL;
+ struct odhcpd_ref_ip *fr_ip = NULL;
+
+ list_for_each_entry(a, &iface->dhcpv4_assignments, head) {
+ if ((a->accept_fr_nonce || iface->dhcpv4_forcereconf) &&
+ !a->fr_ip &&
+ ((a->addr & mask) == (addr->addr.in.s_addr & mask))) {
+ if (!fr_ip) {
+ fr_ip = calloc(1, sizeof(*fr_ip));
+ if (!fr_ip)
+ break;
+
+ list_add(&fr_ip->head, &iface->dhcpv4_fr_ips);
+ fr_ip->addr = *addr;
+ }
+ inc_ref_cnt_ip(&a->fr_ip, fr_ip);
}
+ }
+
+ return fr_ip ? true : false;
+}
+
+static void valid_until_cb(struct uloop_timeout *event)
+{
+ time_t now = odhcpd_time();
+ struct interface *iface;
+ list_for_each_entry(iface, &interfaces, head) {
+ if (iface->dhcpv4 != MODE_SERVER || iface->dhcpv4_assignments.next == NULL)
+ continue;
- // Clean invalid assignments
struct dhcpv4_assignment *a, *n;
list_for_each_entry_safe(a, n, &iface->dhcpv4_assignments, head) {
- if ((htonl(a->addr) & smask->sin_addr.s_addr) !=
- (iface->dhcpv4_start.s_addr & smask->sin_addr.s_addr)) {
- list_del(&a->head);
- free(a);
- }
+ if (!INFINITE_VALID(a->valid_until) && a->valid_until < now)
+ free_dhcpv4_assignment(a);
}
+ }
+ uloop_timeout_set(event, 1000);
+}
+static void handle_addrlist_change(struct interface *iface)
+{
+ struct odhcpd_ipaddr ip;
+ struct odhcpd_ref_ip *a;
+ struct dhcpv4_assignment *c;
+ uint32_t mask = iface->dhcpv4_mask.s_addr;
- if (iface->dhcpv4_leasetime < 60)
- iface->dhcpv4_leasetime = 43200;
+ memset(&ip, 0, sizeof(ip));
+ ip.addr.in = iface->dhcpv4_local;
+ ip.prefix = odhcpd_netmask2bitlen(false, &iface->dhcpv4_mask);
+ ip.broadcast = iface->dhcpv4_bcast;
- iface->dhcpv4_event.uloop.fd = sock;
- iface->dhcpv4_event.handle_dgram = handle_dhcpv4;
- odhcpd_register(&iface->dhcpv4_event);
- } else if (iface->dhcpv4_assignments.next) {
- while (!list_empty(&iface->dhcpv4_assignments)) {
- struct dhcpv4_assignment *a = list_first_entry(&iface->dhcpv4_assignments,
- struct dhcpv4_assignment, head);
- list_del(&a->head);
- free(a->hostname);
- free(a);
+ setup_dhcpv4_addresses(iface);
+
+ if ((ip.addr.in.s_addr & mask) ==
+ (iface->dhcpv4_local.s_addr & iface->dhcpv4_mask.s_addr))
+ return;
+
+ if (ip.addr.in.s_addr && !leases_require_fr(iface, &ip, mask))
+ return;
+
+ if (iface->dhcpv4_local.s_addr == INADDR_ANY || list_empty(&iface->dhcpv4_fr_ips))
+ return;
+
+ a = list_first_entry(&iface->dhcpv4_fr_ips, struct odhcpd_ref_ip, head);
+
+ if (netlink_setup_addr(&a->addr, iface->ifindex, false, true)) {
+ syslog(LOG_ERR, "Failed to add ip address");
+ return;
+ }
+
+ list_for_each_entry(c, &iface->dhcpv4_assignments, head) {
+ if ((c->flags & OAF_BOUND) && c->fr_ip && !c->fr_cnt) {
+ if (c->accept_fr_nonce || iface->dhcpv4_forcereconf)
+ dhcpv4_fr_start(c);
+ else
+ dhcpv4_fr_stop(c);
}
+ }
+}
+static char *dhcpv4_msg_to_string(uint8_t reqmsg)
+{
+ switch (reqmsg) {
+ case (DHCPV4_MSG_DISCOVER):
+ return "DHCPV4_MSG_DISCOVER";
+ case (DHCPV4_MSG_OFFER):
+ return "DHCPV4_MSG_OFFER";
+ case (DHCPV4_MSG_REQUEST):
+ return "DHCPV4_MSG_REQUEST";
+ case (DHCPV4_MSG_DECLINE):
+ return "DHCPV4_MSG_DECLINE";
+ case (DHCPV4_MSG_ACK):
+ return "DHCPV4_MSG_ACK";
+ case (DHCPV4_MSG_NAK):
+ return "DHCPV4_MSG_NAK";
+ case (DHCPV4_MSG_RELEASE):
+ return "DHCPV4_MSG_RELEASE";
+ case (DHCPV4_MSG_INFORM):
+ return "DHCPV4_MSG_INFORM";
+ case (DHCPV4_MSG_FORCERENEW):
+ return "DHCPV4_MSG_FORCERENEW";
+ default:
+ return "UNKNOWN";
}
- return 0;
}
+static void free_dhcpv4_assignment(struct dhcpv4_assignment *a)
+{
+ if (a->head.next)
+ list_del(&a->head);
+
+ if (a->fr_ip)
+ dhcpv4_fr_stop(a);
+
+ free(a->hostname);
+ free(a);
+}
static void dhcpv4_put(struct dhcpv4_message *msg, uint8_t **cookie,
uint8_t type, uint8_t len, const void *data)
*cookie = c + len;
}
+static void dhcpv4_fr_send(struct dhcpv4_assignment *a)
+{
+ struct dhcpv4_message fr_msg = {
+ .op = DHCPV4_BOOTREPLY,
+ .htype = 1,
+ .hlen = 6,
+ .hops = 0,
+ .secs = 0,
+ .flags = 0,
+ .ciaddr = {INADDR_ANY},
+ .yiaddr = {INADDR_ANY},
+ .siaddr = {INADDR_ANY},
+ .giaddr = {INADDR_ANY},
+ .chaddr = {0},
+ .sname = {0},
+ .file = {0},
+ };
+ struct dhcpv4_auth_forcerenew *auth_o, auth = {
+ .protocol = 3,
+ .algorithm = 1,
+ .rdm = 0,
+ .replay = {htonl(time(NULL)), htonl(++serial)},
+ .type = 2,
+ .key = {0},
+ };
+ struct interface *iface = a->iface;
+
+ odhcpd_urandom(&fr_msg.xid, sizeof(fr_msg.xid));
+ memcpy(fr_msg.chaddr, a->hwaddr, fr_msg.hlen);
+
+ fr_msg.options[0] = 0x63;
+ fr_msg.options[1] = 0x82;
+ fr_msg.options[2] = 0x53;
+ fr_msg.options[3] = 0x63;
+
+ uint8_t *cookie = &fr_msg.options[4];
+ uint8_t msg = DHCPV4_MSG_FORCERENEW;
+
+ dhcpv4_put(&fr_msg, &cookie, DHCPV4_OPT_MESSAGE, 1, &msg);
+ if (a->accept_fr_nonce) {
+ dhcpv4_put(&fr_msg, &cookie, DHCPV4_OPT_AUTHENTICATION, sizeof(auth), &auth);
+ auth_o = (struct dhcpv4_auth_forcerenew *)(cookie - sizeof(auth));
+ dhcpv4_put(&fr_msg, &cookie, DHCPV4_OPT_END, 0, NULL);
+
+ md5_ctx_t md5;
+ uint8_t secretbytes[64];
+ memset(secretbytes, 0, sizeof(secretbytes));
+ memcpy(secretbytes, a->key, sizeof(a->key));
+
+ for (size_t i = 0; i < sizeof(secretbytes); ++i)
+ secretbytes[i] ^= 0x36;
+
+ md5_begin(&md5);
+ md5_hash(secretbytes, sizeof(secretbytes), &md5);
+ md5_hash(&fr_msg, sizeof(fr_msg), &md5);
+ md5_end(auth_o->key, &md5);
+
+ for (size_t i = 0; i < sizeof(secretbytes); ++i) {
+ secretbytes[i] ^= 0x36;
+ secretbytes[i] ^= 0x5c;
+ }
+
+ md5_begin(&md5);
+ md5_hash(secretbytes, sizeof(secretbytes), &md5);
+ md5_hash(auth_o->key, sizeof(auth_o->key), &md5);
+ md5_end(auth_o->key, &md5);
+ } else {
+ dhcpv4_put(&fr_msg, &cookie, DHCPV4_OPT_SERVERID, 4,
+ &a->fr_ip->addr.addr.in.s_addr);
+ dhcpv4_put(&fr_msg, &cookie, DHCPV4_OPT_END, 0, NULL);
+ }
+
+ struct sockaddr_in dest;
+ memset(&dest, 0, sizeof(dest));
+ dest.sin_family = AF_INET;
+ dest.sin_port = htons(DHCPV4_CLIENT_PORT);
+ dest.sin_addr.s_addr = a->addr;
+
+ syslog(LOG_WARNING, "sending %s to %02x:%02x:%02x:%02x:%02x:%02x - %s",
+ dhcpv4_msg_to_string(msg),
+ a->hwaddr[0], a->hwaddr[1], a->hwaddr[2],
+ a->hwaddr[3], a->hwaddr[4], a->hwaddr[5],
+ inet_ntoa(dest.sin_addr));
+
+ sendto(iface->dhcpv4_event.uloop.fd, &fr_msg, sizeof(fr_msg),
+ MSG_DONTWAIT, (struct sockaddr*)&dest, sizeof(dest));
+}
+
+static void dhcpv4_fr_timer(struct uloop_timeout *event)
+{
+ struct dhcpv4_assignment *a = container_of(event, struct dhcpv4_assignment, fr_timer);
+
+ if (a->fr_cnt > 0 && a->fr_cnt < 8) {
+ dhcpv4_fr_send(a);
+ uloop_timeout_set(&a->fr_timer, 1000 << a->fr_cnt);
+ a->fr_cnt++;
+ } else
+ dhcpv4_fr_stop(a);
+}
+
+static void dhcpv4_fr_start(struct dhcpv4_assignment *a)
+{
+ uloop_timeout_set(&a->fr_timer, 1000 << a->fr_cnt);
+ a->fr_timer.cb = dhcpv4_fr_timer;
+ a->fr_cnt++;
+
+ dhcpv4_fr_send(a);
+}
+
+static void dhcpv4_fr_stop(struct dhcpv4_assignment *a)
+{
+ uloop_timeout_cancel(&a->fr_timer);
+ decr_ref_cnt_ip(&a->fr_ip, a->iface);
+ a->fr_cnt = 0;
+ a->fr_timer.cb = NULL;
+}
-// Simple DHCPv6-server for information requests
+// Handler for DHCPv4 messages
static void handle_dhcpv4(void *addr, void *data, size_t len,
struct interface *iface, _unused void *dest_addr)
{
req->op != DHCPV4_BOOTREQUEST || req->hlen != 6)
return;
- int sock = iface->dhcpv4_event.uloop.fd;
- struct sockaddr_in ifaddr;
- struct sockaddr_in ifnetmask;
syslog(LOG_NOTICE, "Got DHCPv4 request");
- struct ifreq ifreq;
- memcpy(ifreq.ifr_name, iface->ifname, sizeof(ifreq.ifr_name));
- if (ioctl(sock, SIOCGIFADDR, &ifreq)) {
- syslog(LOG_WARNING, "DHCPv4 failed to detect address: %s", strerror(errno));
+ if (!iface->dhcpv4_start_ip.s_addr && !iface->dhcpv4_end_ip.s_addr) {
+ syslog(LOG_WARNING, "No DHCP range available on %s", iface->name);
return;
}
- memcpy(&ifaddr, &ifreq.ifr_addr, sizeof(ifaddr));
- if (ioctl(sock, SIOCGIFNETMASK, &ifreq))
- return;
-
- memcpy(&ifnetmask, &ifreq.ifr_netmask, sizeof(ifnetmask));
- uint32_t network = ifaddr.sin_addr.s_addr & ifnetmask.sin_addr.s_addr;
-
- if ((iface->dhcpv4_start.s_addr & ifnetmask.sin_addr.s_addr) != network ||
- (iface->dhcpv4_end.s_addr & ifnetmask.sin_addr.s_addr) != network) {
- syslog(LOG_WARNING, "DHCPv4 range out of assigned network");
- return;
- }
-
- struct ifreq ifr = {.ifr_name = ""};
- strncpy(ifr.ifr_name, iface->ifname, sizeof(ifr.ifr_name));
+ int sock = iface->dhcpv4_event.uloop.fd;
struct dhcpv4_message reply = {
.op = DHCPV4_BOOTREPLY,
- .htype = 1,
- .hlen = 6,
+ .htype = req->htype,
+ .hlen = req->hlen,
.hops = 0,
.xid = req->xid,
.secs = 0,
.flags = req->flags,
.ciaddr = {INADDR_ANY},
.giaddr = req->giaddr,
- .siaddr = ifaddr.sin_addr,
+ .siaddr = iface->dhcpv4_local,
};
memcpy(reply.chaddr, req->chaddr, sizeof(reply.chaddr));
uint8_t reqmsg = DHCPV4_MSG_REQUEST;
uint8_t msg = DHCPV4_MSG_ACK;
- struct in_addr reqaddr = {INADDR_ANY};
+ uint32_t reqaddr = INADDR_ANY;
+ uint32_t leasetime = 0;
+ size_t hostname_len = 0;
char hostname[256];
- hostname[0] = 0;
+ bool accept_fr_nonce = false;
+ bool incl_fr_opt = false;
uint8_t *start = &req->options[4];
uint8_t *end = ((uint8_t*)data) + len;
struct dhcpv4_option *opt;
dhcpv4_for_each_option(start, end, opt) {
- if (opt->type == DHCPV4_OPT_MESSAGE && opt->len == 1) {
+ if (opt->type == DHCPV4_OPT_MESSAGE && opt->len == 1)
reqmsg = opt->data[0];
- } else if (opt->type == DHCPV4_OPT_HOSTNAME && opt->len > 0) {
- memcpy(hostname, opt->data, opt->len);
- hostname[opt->len] = 0;
- } else if (opt->type == DHCPV4_OPT_IPADDRESS && opt->len == 4) {
+ else if (opt->type == DHCPV4_OPT_HOSTNAME && opt->len > 0) {
+ hostname_len = opt->len;
+ memcpy(hostname, opt->data, hostname_len);
+ hostname[hostname_len] = 0;
+ } else if (opt->type == DHCPV4_OPT_IPADDRESS && opt->len == 4)
memcpy(&reqaddr, opt->data, 4);
- } else if (opt->type == DHCPV4_OPT_SERVERID && opt->len == 4) {
- if (memcmp(opt->data, &ifaddr.sin_addr, 4))
+ else if (opt->type == DHCPV4_OPT_SERVERID && opt->len == 4) {
+ if (memcmp(opt->data, &iface->dhcpv4_local, 4))
return;
} else if (iface->filter_class && opt->type == DHCPV4_OPT_USER_CLASS) {
uint8_t *c = opt->data, *cend = &opt->data[opt->len];
if (*c == elen && !memcmp(&c[1], iface->filter_class, elen))
return; // Ignore from homenet
}
+ } else if (opt->type == DHCPV4_OPT_LEASETIME && opt->len == 4)
+ memcpy(&leasetime, opt->data, 4);
+ else if (opt->type == DHCPV4_OPT_FORCERENEW_NONCE_CAPABLE && opt->len > 0) {
+ for (uint8_t i = 0; i < opt->len; i++) {
+ if (opt->data[i] == 1) {
+ accept_fr_nonce = true;
+ break;
+ }
+ }
+
}
}
return;
struct dhcpv4_assignment *lease = NULL;
+ uint32_t serverid = iface->dhcpv4_local.s_addr;
+ uint32_t fr_serverid = INADDR_ANY;
+
if (reqmsg != DHCPV4_MSG_INFORM)
- lease = dhcpv4_lease(iface, reqmsg, req->chaddr, reqaddr, hostname);
+ lease = dhcpv4_lease(iface, reqmsg, req->chaddr, reqaddr,
+ &leasetime, hostname, hostname_len,
+ accept_fr_nonce, &incl_fr_opt, &fr_serverid);
if (!lease) {
if (reqmsg == DHCPV4_MSG_REQUEST)
msg = DHCPV4_MSG_NAK;
else if (reqmsg == DHCPV4_MSG_DISCOVER)
return;
- } else if (reqmsg == DHCPV4_MSG_DISCOVER) {
+ } else if (reqmsg == DHCPV4_MSG_DISCOVER)
msg = DHCPV4_MSG_OFFER;
- } else if (reqmsg == DHCPV4_MSG_REQUEST && reqaddr.s_addr &&
- reqaddr.s_addr != htonl(lease->addr)) {
+ else if (reqmsg == DHCPV4_MSG_REQUEST &&
+ ((reqaddr && reqaddr != lease->addr) ||
+ (req->ciaddr.s_addr && req->ciaddr.s_addr != lease->addr))) {
msg = DHCPV4_MSG_NAK;
/*
* DHCP client requested an IP which we can't offer to him. Probably the
- * client changed the network. The reply type is set to DHCPV4_MSG_NAK,
- * because the client should not use that IP.
+ * client changed the network or the network has been changed. The reply
+ * type is set to DHCPV4_MSG_NAK, because the client should not use that IP.
*
* For modern devices we build an answer that includes a valid IP, like
* a DHCPV4_MSG_ACK. The client will use that IP and doesn't need to
* perform additional DHCP round trips.
*
*/
+
+ /*
+ *
+ * Buggy clients do serverid checking in nack messages; therefore set the
+ * serverid in nack messages triggered by a previous force renew equal to
+ * the server id in use at that time by the server
+ *
+ */
+ if (fr_serverid)
+ serverid = fr_serverid;
+
+ if (req->ciaddr.s_addr &&
+ ((iface->dhcpv4_start_ip.s_addr & iface->dhcpv4_mask.s_addr) !=
+ (req->ciaddr.s_addr & iface->dhcpv4_mask.s_addr)))
+ req->ciaddr.s_addr = INADDR_ANY;
}
- syslog(LOG_WARNING, "received %s from %x:%x:%x:%x:%x:%x",
+ syslog(LOG_WARNING, "received %s from %02x:%02x:%02x:%02x:%02x:%02x",
dhcpv4_msg_to_string(reqmsg),
req->chaddr[0],req->chaddr[1],req->chaddr[2],
req->chaddr[3],req->chaddr[4],req->chaddr[5]);
+#ifdef WITH_UBUS
+ if (reqmsg == DHCPV4_MSG_RELEASE)
+ ubus_bcast_dhcp_event("dhcp.release", req->chaddr, req->hlen,
+ &req->ciaddr, hostname, iface->ifname);
+#endif
if (reqmsg == DHCPV4_MSG_DECLINE || reqmsg == DHCPV4_MSG_RELEASE)
return;
dhcpv4_put(&reply, &cookie, DHCPV4_OPT_MESSAGE, 1, &msg);
- dhcpv4_put(&reply, &cookie, DHCPV4_OPT_SERVERID, 4, &ifaddr.sin_addr);
+ dhcpv4_put(&reply, &cookie, DHCPV4_OPT_SERVERID, 4, &serverid);
if (lease) {
- reply.yiaddr.s_addr = htonl(lease->addr);
+ uint32_t val;
+
+ reply.yiaddr.s_addr = lease->addr;
- uint32_t val = htonl(iface->dhcpv4_leasetime);
+ val = htonl(leasetime);
dhcpv4_put(&reply, &cookie, DHCPV4_OPT_LEASETIME, 4, &val);
- val = htonl(500 * iface->dhcpv4_leasetime / 1000);
- dhcpv4_put(&reply, &cookie, DHCPV4_OPT_RENEW, 4, &val);
+ if (leasetime != UINT32_MAX) {
+ val = htonl(500 * leasetime / 1000);
+ dhcpv4_put(&reply, &cookie, DHCPV4_OPT_RENEW, 4, &val);
- val = htonl(875 * iface->dhcpv4_leasetime / 1000);
- dhcpv4_put(&reply, &cookie, DHCPV4_OPT_REBIND, 4, &val);
+ val = htonl(875 * leasetime / 1000);
+ dhcpv4_put(&reply, &cookie, DHCPV4_OPT_REBIND, 4, &val);
+ }
- dhcpv4_put(&reply, &cookie, DHCPV4_OPT_NETMASK, 4, &ifnetmask.sin_addr);
+ dhcpv4_put(&reply, &cookie, DHCPV4_OPT_NETMASK, 4,
+ &iface->dhcpv4_mask.s_addr);
- if (lease->hostname[0])
+ if (lease->hostname)
dhcpv4_put(&reply, &cookie, DHCPV4_OPT_HOSTNAME,
strlen(lease->hostname), lease->hostname);
- if (!ioctl(sock, SIOCGIFBRDADDR, &ifr)) {
- struct sockaddr_in *ina = (struct sockaddr_in*)&ifr.ifr_broadaddr;
- dhcpv4_put(&reply, &cookie, DHCPV4_OPT_BROADCAST, 4, &ina->sin_addr);
+ if (iface->dhcpv4_bcast.s_addr != INADDR_ANY)
+ dhcpv4_put(&reply, &cookie, DHCPV4_OPT_BROADCAST, 4, &iface->dhcpv4_bcast);
+
+ if (incl_fr_opt) {
+ if (reqmsg == DHCPV4_MSG_REQUEST) {
+ struct dhcpv4_auth_forcerenew auth = {
+ .protocol = 3,
+ .algorithm = 1,
+ .rdm = 0,
+ .replay = {htonl(time(NULL)), htonl(++serial)},
+ .type = 1,
+ .key = {0},
+ };
+
+ memcpy(auth.key, lease->key, sizeof(auth.key));
+ dhcpv4_put(&reply, &cookie, DHCPV4_OPT_AUTHENTICATION, sizeof(auth), &auth);
+ } else {
+ uint8_t one = 1;
+ dhcpv4_put(&reply, &cookie, DHCPV4_OPT_FORCERENEW_NONCE_CAPABLE,
+ sizeof(one), &one);
+ }
}
}
+ struct ifreq ifr = {.ifr_name = ""};
+ strncpy(ifr.ifr_name, iface->ifname, sizeof(ifr.ifr_name));
+
if (!ioctl(sock, SIOCGIFMTU, &ifr)) {
uint16_t mtu = htons(ifr.ifr_mtu);
dhcpv4_put(&reply, &cookie, DHCPV4_OPT_MTU, 2, &mtu);
}
- if (iface->search && iface->search_len <= 255) {
+ if (iface->search && iface->search_len <= 255)
dhcpv4_put(&reply, &cookie, DHCPV4_OPT_SEARCH_DOMAIN,
iface->search_len, iface->search);
- } else if (!res_init() && _res.dnsrch[0] && _res.dnsrch[0][0]) {
+ else if (!res_init() && _res.dnsrch[0] && _res.dnsrch[0][0]) {
uint8_t search_buf[256];
int len = dn_comp(_res.dnsrch[0], search_buf,
sizeof(search_buf), NULL, NULL);
}
if (iface->dhcpv4_router_cnt == 0)
- dhcpv4_put(&reply, &cookie, DHCPV4_OPT_ROUTER, 4, &ifaddr.sin_addr);
+ dhcpv4_put(&reply, &cookie, DHCPV4_OPT_ROUTER, 4, &iface->dhcpv4_local);
else
dhcpv4_put(&reply, &cookie, DHCPV4_OPT_ROUTER,
4 * iface->dhcpv4_router_cnt, iface->dhcpv4_router);
if (iface->dhcpv4_dns_cnt == 0)
- dhcpv4_put(&reply, &cookie, DHCPV4_OPT_DNSSERVER, 4, &ifaddr.sin_addr);
+ dhcpv4_put(&reply, &cookie, DHCPV4_OPT_DNSSERVER, 4, &iface->dhcpv4_local);
else
dhcpv4_put(&reply, &cookie, DHCPV4_OPT_DNSSERVER,
4 * iface->dhcpv4_dns_cnt, iface->dhcpv4_dns);
ioctl(sock, SIOCSARP, &arp);
}
- if (dest.sin_addr.s_addr == INADDR_BROADCAST) {
- /*
- * reply goes to IP broadcast -> MAC broadcast
- */
+ if (dest.sin_addr.s_addr == INADDR_BROADCAST)
+ /* reply goes to IP broadcast -> MAC broadcast */
syslog(LOG_WARNING, "sending %s to ff:ff:ff:ff:ff:ff - %s",
dhcpv4_msg_to_string(msg),
inet_ntoa(dest.sin_addr));
- } else {
+ else
/*
* reply is send directly to IP,
* MAC is assumed to be the same as the request
*/
- syslog(LOG_WARNING, "sending %s to %x:%x:%x:%x:%x:%x - %s",
+ syslog(LOG_WARNING, "sending %s to %02x:%02x:%02x:%02x:%02x:%02x - %s",
dhcpv4_msg_to_string(msg),
req->chaddr[0],req->chaddr[1],req->chaddr[2],
req->chaddr[3],req->chaddr[4],req->chaddr[5],
inet_ntoa(dest.sin_addr));
- }
sendto(sock, &reply, sizeof(reply), MSG_DONTWAIT,
(struct sockaddr*)&dest, sizeof(dest));
-}
+#ifdef WITH_UBUS
+ if (msg == DHCPV4_MSG_ACK)
+ ubus_bcast_dhcp_event("dhcp.ack", req->chaddr, req->hlen, &reply.yiaddr,
+ hostname, iface->ifname);
+#endif
+}
static bool dhcpv4_assign(struct interface *iface,
struct dhcpv4_assignment *assign, uint32_t raddr)
{
- const unsigned tries = 100;
- uint32_t start = ntohl(iface->dhcpv4_start.s_addr);
- uint32_t end = ntohl(iface->dhcpv4_end.s_addr);
+ uint32_t start = ntohl(iface->dhcpv4_start_ip.s_addr);
+ uint32_t end = ntohl(iface->dhcpv4_end_ip.s_addr);
uint32_t count = end - start + 1;
+ // try to assign the IP the client asked for
+ if (start <= ntohl(raddr) && ntohl(raddr) <= end &&
+ !find_assignment_by_addr(iface, raddr)) {
+ assign->addr = raddr;
+ syslog(LOG_INFO, "assigning the IP the client asked for: %u.%u.%u.%u",
+ ((uint8_t *)&assign->addr)[0],
+ ((uint8_t *)&assign->addr)[1],
+ ((uint8_t *)&assign->addr)[2],
+ ((uint8_t *)&assign->addr)[3]);
+ return true;
+ }
+
// Seed RNG with checksum of hwaddress
uint32_t seed = 0;
- for (size_t i = 0; i < sizeof(assign->hwaddr); ++i)
- seed += assign->hwaddr[i];
+ for (size_t i = 0; i < sizeof(assign->hwaddr); ++i) {
+ // Knuth's multiplicative method
+ uint8_t o = assign->hwaddr[i];
+ seed += (o*2654435761) % UINT32_MAX;
+ }
+
srand(seed);
- // Try to assign up to 100x
- for (unsigned i = 0; i < tries; ++i) {
- uint32_t try = (((uint32_t)rand()) % count) + start;
- if (i == 0 && raddr >= start && raddr <= end)
- try = raddr;
- else if (i == tries - 1)
- try = start;
-
- if (list_empty(&iface->dhcpv4_assignments)) {
- assign->addr = try;
- list_add(&assign->head, &iface->dhcpv4_assignments);
- return true;
- }
+ uint32_t try = (((uint32_t)rand()) % count) + start;
- struct dhcpv4_assignment *c;
- list_for_each_entry(c, &iface->dhcpv4_assignments, head) {
- if (c->addr > try) {
- assign->addr = try;
- list_add_tail(&assign->head, &c->head);
- return true;
- } else if (c->addr == try) {
- if (i < tries - 1)
- break;
- else
- ++try;
- }
+ if (list_empty(&iface->dhcpv4_assignments)) {
+ assign->addr = htonl(try);
+ syslog(LOG_INFO, "assigning mapped IP (empty list): %u.%u.%u.%u",
+ ((uint8_t *)&assign->addr)[0],
+ ((uint8_t *)&assign->addr)[1],
+ ((uint8_t *)&assign->addr)[2],
+ ((uint8_t *)&assign->addr)[3]);
+ return true;
+ }
+
+ for (uint32_t i = 0; i < count; ++i) {
+ if (!find_assignment_by_addr(iface, htonl(try))) {
+ /* test was successful: IP address is not assigned, assign it */
+ assign->addr = htonl(try);
+ syslog(LOG_DEBUG, "assigning mapped IP: %u.%u.%u.%u (try %u of %u)",
+ ((uint8_t *)&assign->addr)[0],
+ ((uint8_t *)&assign->addr)[1],
+ ((uint8_t *)&assign->addr)[2],
+ ((uint8_t *)&assign->addr)[3],
+ i, count);
+ return true;
}
+ try = (((try - start) + 1) % count) + start;
}
+ syslog(LOG_WARNING, "can't assign any IP address -> address space is full");
return false;
}
static struct dhcpv4_assignment* dhcpv4_lease(struct interface *iface,
- enum dhcpv4_msg msg, const uint8_t *mac, struct in_addr reqaddr,
- const char *hostname)
+ enum dhcpv4_msg msg, const uint8_t *mac, const uint32_t reqaddr,
+ uint32_t *leasetime, const char *hostname, const size_t hostname_len,
+ const bool accept_fr_nonce, bool *incl_fr_opt, uint32_t *fr_serverid)
{
+ struct dhcpv4_assignment *a = find_assignment_by_hwaddr(iface, mac);
struct dhcpv4_assignment *lease = NULL;
- uint32_t raddr = ntohl(reqaddr.s_addr);
time_t now = odhcpd_time();
- struct dhcpv4_assignment *c, *n, *a = NULL;
- list_for_each_entry_safe(c, n, &iface->dhcpv4_assignments, head) {
- if (!memcmp(c->hwaddr, mac, 6)) {
- a = c;
- if (c->addr == raddr)
- break;
- } else if (c->valid_until < now) {
- list_del(&c->head);
- free(c);
- }
+ if (a && (a->flags & OAF_BOUND) && a->fr_ip) {
+ *fr_serverid = a->fr_ip->addr.addr.in.s_addr;
+ dhcpv4_fr_stop(a);
}
if (msg == DHCPV4_MSG_DISCOVER || msg == DHCPV4_MSG_REQUEST) {
bool assigned = !!a;
- size_t hostlen = strlen(hostname) + 1;
- if (!a && !iface->no_dynamic_dhcp) { // Create new binding
- a = calloc(1, sizeof(*a) + hostlen);
- if (!a) {
- syslog(LOG_ERR, "Failed to calloc binding on interface %s", iface->ifname);
- return NULL;
+ if (!a) {
+ if (!iface->no_dynamic_dhcp) {
+ /* Create new binding */
+ a = calloc(1, sizeof(*a));
+ if (!a) {
+ syslog(LOG_ERR, "Failed to calloc binding on interface %s",
+ iface->ifname);
+ return NULL;
+ }
+ memcpy(a->hwaddr, mac, sizeof(a->hwaddr));
+ /* Don't consider new assignment as infinite */
+ a->valid_until = now;
+
+ assigned = dhcpv4_assign(iface, a, reqaddr);
+ if (assigned) {
+ a->iface = iface;
+ list_add(&a->head, &iface->dhcpv4_assignments);
+ }
}
- memcpy(a->hwaddr, mac, sizeof(a->hwaddr));
- memcpy(a->hostname, hostname, hostlen);
+ } else if ((a->addr & iface->dhcpv4_mask.s_addr) !=
+ (iface->dhcpv4_start_ip.s_addr & iface->dhcpv4_mask.s_addr)) {
+ list_del(&a->head);
- assigned = dhcpv4_assign(iface, a, raddr);
+ assigned = dhcpv4_assign(iface, a, reqaddr);
+ if (assigned)
+ list_add(&a->head, &iface->dhcpv4_assignments);
}
- if (assigned && !a->hostname[0] && hostname) {
- a = realloc(a, sizeof(*a) + hostlen);
- if (!a) {
- syslog(LOG_ERR, "Failed to realloc binding on interface %s", iface->ifname);
- return NULL;
- }
- memcpy(a->hostname, hostname, hostlen);
+ if (assigned) {
+ uint32_t my_leasetime;
+
+ if (a->leasetime)
+ my_leasetime = a->leasetime;
+ else
+ my_leasetime = iface->dhcpv4_leasetime;
+
+ if ((*leasetime == 0) || (my_leasetime < *leasetime))
+ *leasetime = my_leasetime;
+
+ if (msg == DHCPV4_MSG_DISCOVER) {
+ a->flags &= ~OAF_BOUND;
+
+ *incl_fr_opt = accept_fr_nonce;
+ if (!(a->flags & OAF_STATIC))
+ a->valid_until = now;
+ } else {
+ if (hostname_len > 0) {
+ a->hostname = realloc(a->hostname, hostname_len + 1);
+ if (a->hostname) {
+ memcpy(a->hostname, hostname, hostname_len);
+ a->hostname[hostname_len] = 0;
+ }
+ }
- // Fixup list
- a->head.next->prev = &a->head;
- a->head.prev->next = &a->head;
- }
+ if (!(a->flags & OAF_BOUND)) {
+ a->accept_fr_nonce = accept_fr_nonce;
+ *incl_fr_opt = accept_fr_nonce;
+ odhcpd_urandom(a->key, sizeof(a->key));
+ a->flags |= OAF_BOUND;
+ } else
+ *incl_fr_opt = false;
- // Was only a solicitation: mark binding for removal
- if (assigned && a->valid_until < now) {
- a->valid_until = (msg == DHCPV4_MSG_DISCOVER) ? 0 :
- (now + iface->dhcpv4_leasetime);
- } else if (!assigned && a) { // Cleanup failed assignment
- free(a);
+ if (!(a->flags & OAF_STATIC))
+ a->valid_until = ((*leasetime == UINT32_MAX) ? 0 : (time_t)(now + *leasetime));
+ }
+ } else if (!assigned && a) {
+ /* Cleanup failed assignment */
+ free_dhcpv4_assignment(a);
a = NULL;
}
if (assigned && a)
lease = a;
- } else if (msg == DHCPV4_MSG_RELEASE) {
- if (a && a->valid_until != LONG_MAX)
- a->valid_until = 0;
- } else if (msg == DHCPV4_MSG_DECLINE && a->valid_until != LONG_MAX) {
- memset(a->hwaddr, 0, sizeof(a->hwaddr));
- a->valid_until = now + 3600; // Block address for 1h
+ } else if (msg == DHCPV4_MSG_RELEASE && a) {
+ a->flags &= ~OAF_BOUND;
+
+ if (!(a->flags & OAF_STATIC))
+ a->valid_until = now - 1;
+
+ } else if (msg == DHCPV4_MSG_DECLINE && a) {
+ a->flags &= ~OAF_BOUND;
+
+ if (!(a->flags & OAF_STATIC)) {
+ memset(a->hwaddr, 0, sizeof(a->hwaddr));
+ a->valid_until = now + 3600; /* Block address for 1h */
+ }
}
dhcpv6_write_statefile();
return lease;
}
-
projects / project / odhcpd.git / blobdiff