int
__ni_dhcp4_fsm_discover(ni_dhcp4_device_t *dev, int scan_offers)
{
ni_addrconf_lease_t *lease;
int rv;
ni_info("%s: Initiating DHCPv4 discovery (ifindex %d)", dev->ifname, dev->link.ifindex);
/* If we already have a lease, try asking for the same.
* If not, create a dummy lease with NULL fields.
* Note: if DISCOVER for the old lease times out,
* we should fall back to asking for anything.
*/
if ((lease = dev->lease) == NULL)
lease = ni_addrconf_lease_new(NI_ADDRCONF_DHCP, AF_INET);
lease->uuid = dev->config->uuid;
dev->fsm.state = NI_DHCP4_STATE_SELECTING;
rv = ni_dhcp4_device_send_message(dev, DHCP4_DISCOVER, lease);
dev->dhcp4.accept_any_offer = 1;
ni_debug_dhcp("valid lease: %d; have prefs: %d",
ni_addrconf_lease_is_valid(dev->lease),
ni_dhcp4_config_have_server_preference());
if (ni_addrconf_lease_is_valid(dev->lease)
|| (scan_offers && ni_dhcp4_config_have_server_preference())) {
ni_dhcp4_fsm_set_timeout(dev, dev->config->initial_discovery_timeout);
dev->dhcp4.accept_any_offer = 0;
} else {
ni_dhcp4_fsm_set_timeout(dev, dev->config->request_timeout);
}
ni_dhcp4_device_drop_best_offer(dev);
if (lease != dev->lease)
ni_addrconf_lease_free(lease);
return rv;
}
/*
* Reload an old lease from file, and see whether we can reuse it.
* This is used during restart of wickedd.
*/
int
ni_dhcp4_recover_lease(ni_dhcp4_device_t *dev)
{
ni_addrconf_lease_t *lease;
ni_sockaddr_t addr;
if (dev->lease)
return 1;
lease = ni_addrconf_lease_file_read(dev->ifname, NI_ADDRCONF_DHCP, AF_INET);
if (!lease)
return -1;
if (!ni_addrconf_lease_is_valid(dev->lease)) {
ni_debug_verbose(NI_LOG_DEBUG1, NI_TRACE_DHCP,
"%s: discarding existing lease, not granted",
dev->ifname);
goto discard;
}
/* We cannot renew/rebind/reboot without it */
ni_sockaddr_set_ipv4(&addr, lease->dhcp4.server_id, 0);
if (!ni_sockaddr_is_ipv4_specified(&addr)) {
ni_debug_verbose(NI_LOG_DEBUG1, NI_TRACE_DHCP,
"%s: discarding existing lease, no server-id",
dev->ifname);
goto discard;
}
ni_dhcp4_device_set_lease(dev, lease);
return 0;
discard:
ni_addrconf_lease_free(lease);
return -1;
}
/*
* Process a request to reconfigure the device (ie rebind a lease, or discover
* a new lease).
*/
int
ni_dhcp4_acquire(ni_dhcp4_device_t *dev, const ni_dhcp4_request_t *info)
{
ni_dhcp4_config_t *config;
const char *classid;
size_t len;
int rv;
if ((rv = ni_dhcp4_device_refresh(dev)) < 0)
return rv;
config = xcalloc(1, sizeof(*config));
config->dry_run = info->dry_run;
config->resend_timeout = NI_DHCP4_RESEND_TIMEOUT_INIT;
config->request_timeout = info->acquire_timeout?: NI_DHCP4_REQUEST_TIMEOUT;
config->initial_discovery_timeout = NI_DHCP4_DISCOVERY_TIMEOUT;
config->uuid = info->uuid;
config->flags = info->flags;
config->update = info->update;
config->route_priority = info->route_priority;
config->start_delay = info->start_delay;
config->recover_lease = info->recover_lease;
config->release_lease = info->release_lease;
config->max_lease_time = ni_dhcp4_config_max_lease_time();
if (config->max_lease_time == 0)
config->max_lease_time = ~0U;
if (info->lease_time && info->lease_time < config->max_lease_time)
config->max_lease_time = info->lease_time;
if ((len = ni_string_len(info->hostname)) > 0) {
if (ni_check_domain_name(info->hostname, len, 0)) {
strncpy(config->hostname, info->hostname, sizeof(config->hostname) - 1);
} else {
ni_debug_dhcp("Discarded request to use suspect hostname: '%s'",
ni_print_suspect(info->hostname, len));
}
}
if (info->clientid) {
ni_dhcp4_parse_client_id(&config->client_id, dev->system.hwaddr.type,
info->clientid);
} else {
/* Set client ID from interface hwaddr */
ni_dhcp4_set_client_id(&config->client_id, &dev->system.hwaddr);
}
if ((classid = info->vendor_class) == NULL)
classid = ni_dhcp4_config_vendor_class();
if (classid)
strncpy(config->classid, classid, sizeof(config->classid) - 1);
config->doflags = DHCP4_DO_DEFAULT;
config->doflags |= ni_dhcp4_do_bits(info->update);
if (ni_debug & NI_TRACE_DHCP) {
ni_trace("Received request:");
ni_trace(" acquire-timeout %u", config->request_timeout);
ni_trace(" lease-time %u", config->max_lease_time);
ni_trace(" start-delay %u", config->start_delay);
ni_trace(" hostname %s", config->hostname[0]? config->hostname : "<none>");
ni_trace(" vendor-class %s", config->classid[0]? config->classid : "<none>");
ni_trace(" client-id %s", ni_print_hex(config->client_id.data, config->client_id.len));
ni_trace(" uuid %s", ni_uuid_print(&config->uuid));
ni_trace(" update-flags %s", __ni_dhcp4_print_doflags(config->doflags));
ni_trace(" recover_lease %s", config->recover_lease ? "true" : "false");
ni_trace(" release_lease %s", config->release_lease ? "true" : "false");
}
ni_dhcp4_device_set_config(dev, config);
if (!dev->lease)
ni_dhcp4_recover_lease(dev);
if (dev->lease) {
if (!ni_addrconf_lease_is_valid(dev->lease)
|| (config->client_id.len && !ni_opaque_eq(&config->client_id, &dev->lease->dhcp4.client_id))) {
ni_debug_dhcp("%s: lease doesn't match request", dev->ifname);
ni_dhcp4_device_drop_lease(dev);
dev->notify = 1;
}
}
ni_note("%s: Request to acquire DHCPv4 lease with UUID %s",
dev->ifname, ni_uuid_print(&config->uuid));
if (ni_dhcp4_device_start(dev) < 0)
return -1;
return 1;
}