void
ni_dhcp4_fsm_process_arp_packet(ni_arp_socket_t *arph, const ni_arp_packet_t *pkt, void *user_data)
{
ni_dhcp4_device_t *dev = user_data;
ni_netconfig_t *nc = ni_global_state_handle(0);
const ni_netdev_t *ifp;
ni_bool_t false_alarm = FALSE;
ni_bool_t found_addr = FALSE;
if (!pkt || pkt->op != ARPOP_REPLY || !dev || !dev->lease)
return;
/* Is it about the address we're validating at all? */
if (pkt->sip.s_addr != dev->lease->dhcp4.address.s_addr)
return;
/* Ignore any ARP replies that seem to come from our own
* MAC address. Some helpful switches seem to generate
* these. */
if (ni_link_address_equal(&dev->system.hwaddr, &pkt->sha))
return;
/* As well as ARP replies that seem to come from our own
* host: dup if same address, not a dup if there are two
* interfaces connected to the same broadcast domain.
*/
for (ifp = ni_netconfig_devlist(nc); ifp; ifp = ifp->next) {
if (ifp->link.ifindex == dev->link.ifindex)
continue;
if (!ni_netdev_link_is_up(ifp))
continue;
if (!ni_link_address_equal(&ifp->link.hwaddr, &pkt->sha))
continue;
/* OK, we have an interface matching the hwaddr,
* which will answer arp requests when it is on
* the same broadcast domain and causes a false
* alarm, except it really has the IP assigned.
*/
false_alarm = TRUE;
if (__ni_dhcp4_address_on_device(ifp, pkt->sip))
found_addr = TRUE;
}
if (false_alarm && !found_addr)
return;
ni_debug_dhcp("%s: address %s already in use by %s",
dev->ifname, inet_ntoa(pkt->sip),
ni_link_address_print(&pkt->sha));
ni_dhcp4_device_arp_close(dev);
ni_dhcp4_fsm_decline(dev);
}
void
ni_netdev_discover_client_state(ni_netdev_t *dev)
{
ni_fsm_state_t state = NI_FSM_STATE_DEVICE_EXISTS;
ni_client_state_t *cs;
if (!dev)
return;
if (ni_netdev_device_is_up(dev))
state = NI_FSM_STATE_DEVICE_UP;
if (ni_netdev_link_is_up(dev))
state = NI_FSM_STATE_LINK_UP;
if (ni_netdev_network_is_up(dev))
state = NI_FSM_STATE_LINK_UP;
cs = ni_client_state_new(state);
ni_netdev_set_client_state(dev, cs);
}
static int
__do_arp_validate_init(struct arp_handle *handle, ni_capture_devinfo_t *dev_info)
{
ni_netconfig_t *nc;
ni_netdev_t *dev;
if (ni_server_listen_interface_events(NULL) < 0) {
ni_error("unable to initialize netlink link listener");
return NI_LSB_RC_ERROR;
}
if (ni_server_enable_interface_addr_events(NULL) < 0) {
ni_error("unable to initialize netlink addr listener");
return NI_LSB_RC_ERROR;
}
if (!(nc = ni_global_state_handle(1))) {
ni_error("Cannot refresh interface list!");
return NI_LSB_RC_ERROR;
}
if (!(dev = ni_netdev_by_name(nc, handle->ifname))) {
ni_error("Cannot find interface with name '%s'",
handle->ifname);
return NI_LSB_RC_ERROR;
}
if (!ni_netdev_supports_arp(dev)) {
ni_error("%s: arp is not supported/enabled", dev->name);
return NI_LSB_RC_ERROR;
}
if (!ni_netdev_link_is_up(dev)) {
ni_error("%s: link is not up", dev->name);
return NI_LSB_RC_ERROR;
}
if (ni_capture_devinfo_init(dev_info, dev->name, &dev->link) < 0) {
ni_error("%s: cannot initialize capture", dev->name);
return NI_LSB_RC_ERROR;
}
return 0;
}
static void
__do_arp_validate_process(ni_arp_socket_t *sock, const ni_arp_packet_t *pkt,
void *user_data)
{
struct arp_handle *handle = user_data;
ni_netconfig_t *nc = ni_global_state_handle(0);
const ni_netdev_t *ifp;
ni_bool_t false_alarm = FALSE;
ni_bool_t found_addr = FALSE;
const ni_address_t *ap;
ni_sockaddr_t addr;
if (!pkt || pkt->op != ARPOP_REPLY || !handle->replies)
return;
/* Is it about the address we're validating at all? */
if (pkt->sip.s_addr != handle->ipaddr.sin.sin_addr.s_addr) {
ni_debug_application("%s: report about different address",
handle->ifname);
return;
}
/* Ignore any ARP replies that seem to come from our own
* MAC address. Some helpful switches seem to generate
* these. */
if (ni_link_address_equal(&sock->dev_info.hwaddr, &pkt->sha)) {
ni_debug_application("%s: adress in use by ourself",
handle->ifname);
return;
}
/* As well as ARP replies that seem to come from our own
* host: dup if same address, not a dup if there are two
* interfaces connected to the same broadcast domain.
*/
ni_sockaddr_set_ipv4(&addr, pkt->sip, 0);
for (ifp = ni_netconfig_devlist(nc); ifp; ifp = ifp->next) {
if (ifp->link.ifindex == sock->dev_info.ifindex)
continue;
if (!ni_netdev_link_is_up(ifp))
continue;
if (!ni_link_address_equal(&ifp->link.hwaddr, &pkt->sha))
continue;
/* OK, we have an interface matching the hwaddr,
* which will answer arp requests when it is on
* the same broadcast domain and causes a false
* alarm, except it really has the IP assigned.
*/
false_alarm = TRUE;
for (ap = ifp->addrs; !found_addr && ap; ap = ap->next) {
if (ap->family != AF_INET)
continue;
if (ni_sockaddr_equal(&ap->local_addr, &addr))
found_addr = TRUE;
}
}
if (false_alarm && !found_addr) {
ni_debug_application("%s: reply from one of our interfaces",
handle->ifname);
return;
}
ni_info("%s: adress %s in use by %s reported",
handle->ifname,
inet_ntoa(pkt->sip),
ni_link_address_print(&pkt->sha));
handle->hwaddr = pkt->sha;
}
int
ni_dhcp4_tester_run(ni_dhcp4_tester_t *opts)
{
ni_netconfig_t *nc;
ni_netdev_t *ifp = NULL;
ni_dhcp4_device_t *dev = NULL;
ni_dhcp4_request_t *req = NULL;
unsigned int link_timeout = 20;
int rv;
if (opts->timeout && opts->timeout != -1U) {
link_timeout = (opts->timeout * 2) / 3;
opts->timeout -= link_timeout;
}
if (!opts || ni_string_empty(opts->ifname))
ni_fatal("Invalid start parameters!");
dhcp4_tester_opts = *opts;
dhcp4_tester_status = NI_WICKED_RC_ERROR;
if (!(nc = ni_global_state_handle(1)))
ni_fatal("Cannot refresh interface list!");
if (!(ifp = ni_netdev_by_name(nc, opts->ifname)))
ni_fatal("Cannot find interface with name '%s'", opts->ifname);
if (!ni_dhcp4_supported(ifp))
ni_fatal("DHCPv4 not supported on '%s'", opts->ifname);
if (!(dev = ni_dhcp4_device_new(ifp->name, &ifp->link)))
ni_fatal("Cannot allocate dhcp4 client for '%s'", opts->ifname);
ni_dhcp4_set_event_handler(ni_dhcp4_tester_protocol_event);
if (!(req = ni_dhcp4_request_new())) {
ni_error("Cannot allocate dhcp4 request");
goto failure;
}
if (!ni_dhcp4_tester_req_init(req, opts->request))
goto failure;
if (!ni_netdev_link_is_up(ifp)) {
ni_netdev_req_t *ifreq;
ni_debug_dhcp("%s: Link is not up, trying to bring it up",
ifp->name);
ifreq = ni_netdev_req_new();
ifreq->ifflags = NI_IFF_LINK_UP | NI_IFF_NETWORK_UP;
if ((rv = ni_system_interface_link_change(ifp, ifreq)) < 0) {
ni_error("%s: Unable to set up link", ifp->name);
ni_netdev_req_free(ifreq);
goto failure;
}
ni_netdev_req_free(ifreq);
do {
sleep(1);
if (!(nc = ni_global_state_handle(1)))
goto failure;
if (!(ifp = ni_netdev_by_index(nc, dev->link.ifindex)))
break;
if (ni_netdev_link_is_up(ifp))
break;
ni_debug_dhcp("%s: Link is not (yet) up", ifp->name);
} while (link_timeout-- > 1);
if (!ifp || !ni_netdev_link_is_up(ifp) || !link_timeout) {
ni_error("%s: Unable to bring link up",
ifp && ifp->name ? ifp->name : dev->ifname);
goto failure;
}
/* Do not try to send too early, even link is reported up now */
sleep(1);
}
if (opts->timeout && opts->timeout != -1U)
req->acquire_timeout = opts->timeout;
req->broadcast = opts->broadcast;
if ((rv = ni_dhcp4_acquire(dev, req)) < 0) {
ni_error("%s: DHCP4v6 acquire request %s failed: %s",
dev->ifname, ni_uuid_print(&req->uuid),
ni_strerror(rv));
goto failure;
}
dhcp4_tester_status = NI_WICKED_RC_IN_PROGRESS;
while (!ni_caught_terminal_signal()) {
long timeout;
timeout = ni_timer_next_timeout();
if (ni_socket_wait(timeout) != 0)
break;
}
ni_server_deactivate_interface_events();
ni_socket_deactivate_all();
failure:
if (dev)
ni_dhcp4_device_put(dev);
if (req)
ni_dhcp4_request_free(req);
return dhcp4_tester_status;
}
