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patch #8361 "Add support for NTP option in DHCP" (slighly modified)
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@ -6,6 +6,9 @@ HISTORY
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++ New features:
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2015-02-16: Claudius Zingerli, Sergio Caprile
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* opt.h, dhcp.h/.c: patch #8361 "Add support for NTP option in DHCP"
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2015-02-14: Simon Goldschmidt
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* opt.h, snmp*: added support for write-access community and dedicated
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community for sending traps
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@ -108,6 +108,13 @@
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#define REBOOT_TRIES 2
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#if LWIP_DHCP_GET_NTP_SRV
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/** This function must exist, in other to add offered NTP servers to
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* the NTP (or SNTP) engine.
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* See LWIP_DHCP_MAX_NTP_SERVERS */
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extern void dhcp_set_ntp_servers(u8_t num_ntp_servers, ip_addr_t* ntp_server_addrs);
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#endif /* LWIP_DHCP_GET_NTP_SRV */
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/** Option handling: options are parsed in dhcp_parse_reply
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* and saved in an array where other functions can load them from.
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* This might be moved into the struct dhcp (not necessarily since
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@ -122,7 +129,12 @@
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#define DHCP_OPTION_IDX_SUBNET_MASK 6
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#define DHCP_OPTION_IDX_ROUTER 7
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#define DHCP_OPTION_IDX_DNS_SERVER 8
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#if LWIP_DHCP_GET_NTP_SRV
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#define DHCP_OPTION_IDX_NTP_SERVER (DHCP_OPTION_IDX_DNS_SERVER + DNS_MAX_SERVERS)
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#define DHCP_OPTION_IDX_MAX (DHCP_OPTION_IDX_NTP_SERVER + LWIP_DHCP_MAX_NTP_SERVERS)
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#else /* LWIP_DHCP_GET_NTP_SRV */
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#define DHCP_OPTION_IDX_MAX (DHCP_OPTION_IDX_DNS_SERVER + DNS_MAX_SERVERS)
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#endif /* LWIP_DHCP_GET_NTP_SRV */
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/** Holds the decoded option values, only valid while in dhcp_recv.
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@todo: move this into struct dhcp? */
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@ -132,6 +144,16 @@ u32_t dhcp_rx_options_val[DHCP_OPTION_IDX_MAX];
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@todo: move this into struct dhcp? */
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u8_t dhcp_rx_options_given[DHCP_OPTION_IDX_MAX];
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static u8_t dhcp_discover_select_options[] = {
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DHCP_OPTION_SUBNET_MASK,
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DHCP_OPTION_ROUTER,
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DHCP_OPTION_BROADCAST,
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DHCP_OPTION_DNS_SERVER
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#if LWIP_DHCP_GET_NTP_SRV
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, DHCP_OPTION_NTP
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#endif /* LWIP_DHCP_GET_NTP_SRV */
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};
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#ifdef DHCP_GLOBAL_XID
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static u32_t xid;
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static u8_t xid_initialised;
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@ -285,6 +307,7 @@ dhcp_select(struct netif *netif)
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struct dhcp *dhcp = netif->dhcp;
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err_t result;
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u16_t msecs;
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u8_t i;
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LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE, ("dhcp_select(netif=%p) %c%c%"U16_F"\n", (void*)netif, netif->name[0], netif->name[1], (u16_t)netif->num));
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dhcp_set_state(dhcp, DHCP_REQUESTING);
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@ -302,11 +325,10 @@ dhcp_select(struct netif *netif)
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dhcp_option(dhcp, DHCP_OPTION_SERVER_ID, 4);
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dhcp_option_long(dhcp, ntohl(ip4_addr_get_u32(&dhcp->server_ip_addr)));
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dhcp_option(dhcp, DHCP_OPTION_PARAMETER_REQUEST_LIST, 4/*num options*/);
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dhcp_option_byte(dhcp, DHCP_OPTION_SUBNET_MASK);
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dhcp_option_byte(dhcp, DHCP_OPTION_ROUTER);
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dhcp_option_byte(dhcp, DHCP_OPTION_BROADCAST);
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dhcp_option_byte(dhcp, DHCP_OPTION_DNS_SERVER);
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dhcp_option(dhcp, DHCP_OPTION_PARAMETER_REQUEST_LIST, sizeof(dhcp_discover_select_options));
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for (i = 0; i < sizeof(dhcp_discover_select_options); i++) {
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dhcp_option_byte(dhcp, dhcp_discover_select_options[i]);
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}
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#if LWIP_NETIF_HOSTNAME
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dhcp_option_hostname(dhcp, netif);
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@ -508,9 +530,11 @@ static void
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dhcp_handle_ack(struct netif *netif)
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{
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struct dhcp *dhcp = netif->dhcp;
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#if LWIP_DNS
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u8_t n;
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#endif /* LWIP_DNS */
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#if LWIP_DHCP_GET_NTP_SRV
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ip_addr_t ntp_server_addrs[LWIP_DHCP_MAX_NTP_SERVERS];
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#endif
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LWIP_UNUSED_ARG(n);
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/* clear options we might not get from the ACK */
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ip_addr_set_zero(&dhcp->offered_sn_mask);
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@ -564,7 +588,15 @@ dhcp_handle_ack(struct netif *netif)
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if (dhcp_option_given(dhcp, DHCP_OPTION_IDX_ROUTER)) {
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ip4_addr_set_u32(&dhcp->offered_gw_addr, htonl(dhcp_get_option_value(dhcp, DHCP_OPTION_IDX_ROUTER)));
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}
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#if LWIP_DHCP_GET_NTP_SRV
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/* NTP servers */
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for(n = 0; (n < LWIP_DHCP_MAX_NTP_SERVERS) && dhcp_option_given(dhcp, DHCP_OPTION_IDX_NTP_SERVER + n); n++) {
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ip4_addr_set_u32(&ntp_server_addrs[n], htonl(dhcp_get_option_value(dhcp, DHCP_OPTION_IDX_NTP_SERVER + n)));
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}
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dhcp_set_ntp_servers(n, ntp_server_addrs);
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#endif /* LWIP_DHCP_GET_NTP_SRV */
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#if LWIP_DNS
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/* DNS servers */
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for(n = 0; (n < DNS_MAX_SERVERS) && dhcp_option_given(dhcp, DHCP_OPTION_IDX_DNS_SERVER + n); n++) {
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@ -885,6 +917,7 @@ dhcp_discover(struct netif *netif)
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struct dhcp *dhcp = netif->dhcp;
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err_t result = ERR_OK;
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u16_t msecs;
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u8_t i;
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LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE, ("dhcp_discover()\n"));
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ip_addr_set_any(&dhcp->offered_ip_addr);
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dhcp_set_state(dhcp, DHCP_SELECTING);
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@ -896,12 +929,10 @@ dhcp_discover(struct netif *netif)
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dhcp_option(dhcp, DHCP_OPTION_MAX_MSG_SIZE, DHCP_OPTION_MAX_MSG_SIZE_LEN);
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dhcp_option_short(dhcp, DHCP_MAX_MSG_LEN(netif));
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dhcp_option(dhcp, DHCP_OPTION_PARAMETER_REQUEST_LIST, 4/*num options*/);
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dhcp_option_byte(dhcp, DHCP_OPTION_SUBNET_MASK);
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dhcp_option_byte(dhcp, DHCP_OPTION_ROUTER);
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dhcp_option_byte(dhcp, DHCP_OPTION_BROADCAST);
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dhcp_option_byte(dhcp, DHCP_OPTION_DNS_SERVER);
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dhcp_option(dhcp, DHCP_OPTION_PARAMETER_REQUEST_LIST, sizeof(dhcp_discover_select_options));
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for (i = 0; i < sizeof(dhcp_discover_select_options); i++) {
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dhcp_option_byte(dhcp, dhcp_discover_select_options[i]);
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}
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dhcp_option_trailer(dhcp);
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LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE, ("dhcp_discover: realloc()ing\n"));
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@ -1434,6 +1465,16 @@ again:
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LWIP_ERROR("len == 4", len == 4, return ERR_VAL;);
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decode_idx = DHCP_OPTION_IDX_LEASE_TIME;
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break;
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#if LWIP_DHCP_GET_NTP_SRV
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case(DHCP_OPTION_NTP):
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/* special case: there might be more than one server */
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LWIP_ERROR("len % 4 == 0", len % 4 == 0, return ERR_VAL;);
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/* limit number of NTP servers */
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decode_len = LWIP_MIN(len, 4 * LWIP_DHCP_MAX_NTP_SERVERS);
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LWIP_ERROR("len >= decode_len", len >= decode_len, return ERR_VAL;);
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decode_idx = DHCP_OPTION_IDX_NTP_SERVER;
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break;
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#endif /* LWIP_DHCP_GET_NTP_SRV*/
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case(DHCP_OPTION_OVERLOAD):
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LWIP_ERROR("len == 1", len == 1, return ERR_VAL;);
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decode_idx = DHCP_OPTION_IDX_OVERLOAD;
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@ -202,6 +202,7 @@ void dhcp_fine_tmr(void);
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#define DHCP_OPTION_MTU 26
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#define DHCP_OPTION_BROADCAST 28
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#define DHCP_OPTION_TCP_TTL 37
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#define DHCP_OPTION_NTP 42
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#define DHCP_OPTION_END 255
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/** DHCP options */
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@ -768,6 +768,22 @@
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#define LWIP_DHCP_BOOTP_FILE 0
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#endif
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/**
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* LWIP_DHCP_GETS_NTP==1: Request NTP servers with discover/select. For each
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* response packet, an callback is called, which has to be provided by the port:
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* void dhcp_set_ntp_servers(u8_t num_ntp_servers, ip_addr_t* ntp_server_addrs);
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*/
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#ifndef LWIP_DHCP_GET_NTP_SRV
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#define LWIP_DHCP_GET_NTP_SRV 0
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#endif
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/**
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* The maximum of NTP servers requested
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*/
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#ifndef LWIP_DHCP_MAX_NTP_SERVERS
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#define LWIP_DHCP_MAX_NTP_SERVERS 1
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#endif
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/*
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------------------------------------
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---------- AUTOIP options ----------
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